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_map_list);
55 static LIST_HEAD(regulator_ena_gpio_list);
56 static LIST_HEAD(regulator_supply_alias_list);
57 static bool has_full_constraints;
59 static struct dentry *debugfs_root;
61 static struct class regulator_class;
64 * struct regulator_map
66 * Used to provide symbolic supply names to devices.
68 struct regulator_map {
69 struct list_head list;
70 const char *dev_name; /* The dev_name() for the consumer */
72 struct regulator_dev *regulator;
76 * struct regulator_enable_gpio
78 * Management for shared enable GPIO pin
80 struct regulator_enable_gpio {
81 struct list_head list;
82 struct gpio_desc *gpiod;
83 u32 enable_count; /* a number of enabled shared GPIO */
84 u32 request_count; /* a number of requested shared GPIO */
85 unsigned int ena_gpio_invert:1;
89 * struct regulator_supply_alias
91 * Used to map lookups for a supply onto an alternative device.
93 struct regulator_supply_alias {
94 struct list_head list;
95 struct device *src_dev;
96 const char *src_supply;
97 struct device *alias_dev;
98 const char *alias_supply;
101 static int _regulator_is_enabled(struct regulator_dev *rdev);
102 static int _regulator_disable(struct regulator_dev *rdev);
103 static int _regulator_get_voltage(struct regulator_dev *rdev);
104 static int _regulator_get_current_limit(struct regulator_dev *rdev);
105 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
106 static int _notifier_call_chain(struct regulator_dev *rdev,
107 unsigned long event, void *data);
108 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
109 int min_uV, int max_uV);
110 static struct regulator *create_regulator(struct regulator_dev *rdev,
112 const char *supply_name);
113 static void _regulator_put(struct regulator *regulator);
115 static struct regulator_dev *dev_to_rdev(struct device *dev)
117 return container_of(dev, struct regulator_dev, dev);
120 static const char *rdev_get_name(struct regulator_dev *rdev)
122 if (rdev->constraints && rdev->constraints->name)
123 return rdev->constraints->name;
124 else if (rdev->desc->name)
125 return rdev->desc->name;
130 static bool have_full_constraints(void)
132 return has_full_constraints || of_have_populated_dt();
135 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
137 if (!rdev->constraints) {
138 rdev_err(rdev, "no constraints\n");
142 if (rdev->constraints->valid_ops_mask & ops)
148 static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
150 if (rdev && rdev->supply)
151 return rdev->supply->rdev;
157 * regulator_lock_supply - lock a regulator and its supplies
158 * @rdev: regulator source
160 static void regulator_lock_supply(struct regulator_dev *rdev)
164 for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
165 mutex_lock_nested(&rdev->mutex, i);
169 * regulator_unlock_supply - unlock a regulator and its supplies
170 * @rdev: regulator source
172 static void regulator_unlock_supply(struct regulator_dev *rdev)
174 struct regulator *supply;
177 mutex_unlock(&rdev->mutex);
178 supply = rdev->supply;
188 * of_get_regulator - get a regulator device node based on supply name
189 * @dev: Device pointer for the consumer (of regulator) device
190 * @supply: regulator supply name
192 * Extract the regulator device node corresponding to the supply name.
193 * returns the device node corresponding to the regulator if found, else
196 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
198 struct device_node *regnode = NULL;
199 char prop_name[32]; /* 32 is max size of property name */
201 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
203 snprintf(prop_name, 32, "%s-supply", supply);
204 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
207 dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
208 prop_name, dev->of_node);
214 /* Platform voltage constraint check */
215 static int regulator_check_voltage(struct regulator_dev *rdev,
216 int *min_uV, int *max_uV)
218 BUG_ON(*min_uV > *max_uV);
220 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
221 rdev_err(rdev, "voltage operation not allowed\n");
225 if (*max_uV > rdev->constraints->max_uV)
226 *max_uV = rdev->constraints->max_uV;
227 if (*min_uV < rdev->constraints->min_uV)
228 *min_uV = rdev->constraints->min_uV;
230 if (*min_uV > *max_uV) {
231 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
239 /* Make sure we select a voltage that suits the needs of all
240 * regulator consumers
242 static int regulator_check_consumers(struct regulator_dev *rdev,
243 int *min_uV, int *max_uV)
245 struct regulator *regulator;
247 list_for_each_entry(regulator, &rdev->consumer_list, list) {
249 * Assume consumers that didn't say anything are OK
250 * with anything in the constraint range.
252 if (!regulator->min_uV && !regulator->max_uV)
255 if (*max_uV > regulator->max_uV)
256 *max_uV = regulator->max_uV;
257 if (*min_uV < regulator->min_uV)
258 *min_uV = regulator->min_uV;
261 if (*min_uV > *max_uV) {
262 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
270 /* current constraint check */
271 static int regulator_check_current_limit(struct regulator_dev *rdev,
272 int *min_uA, int *max_uA)
274 BUG_ON(*min_uA > *max_uA);
276 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
277 rdev_err(rdev, "current operation not allowed\n");
281 if (*max_uA > rdev->constraints->max_uA)
282 *max_uA = rdev->constraints->max_uA;
283 if (*min_uA < rdev->constraints->min_uA)
284 *min_uA = rdev->constraints->min_uA;
286 if (*min_uA > *max_uA) {
287 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
295 /* operating mode constraint check */
296 static int regulator_mode_constrain(struct regulator_dev *rdev,
300 case REGULATOR_MODE_FAST:
301 case REGULATOR_MODE_NORMAL:
302 case REGULATOR_MODE_IDLE:
303 case REGULATOR_MODE_STANDBY:
306 rdev_err(rdev, "invalid mode %x specified\n", *mode);
310 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
311 rdev_err(rdev, "mode operation not allowed\n");
315 /* The modes are bitmasks, the most power hungry modes having
316 * the lowest values. If the requested mode isn't supported
317 * try higher modes. */
319 if (rdev->constraints->valid_modes_mask & *mode)
327 static ssize_t regulator_uV_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
333 mutex_lock(&rdev->mutex);
334 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
335 mutex_unlock(&rdev->mutex);
339 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
341 static ssize_t regulator_uA_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
344 struct regulator_dev *rdev = dev_get_drvdata(dev);
346 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
348 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
350 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
355 return sprintf(buf, "%s\n", rdev_get_name(rdev));
357 static DEVICE_ATTR_RO(name);
359 static ssize_t regulator_print_opmode(char *buf, int mode)
362 case REGULATOR_MODE_FAST:
363 return sprintf(buf, "fast\n");
364 case REGULATOR_MODE_NORMAL:
365 return sprintf(buf, "normal\n");
366 case REGULATOR_MODE_IDLE:
367 return sprintf(buf, "idle\n");
368 case REGULATOR_MODE_STANDBY:
369 return sprintf(buf, "standby\n");
371 return sprintf(buf, "unknown\n");
374 static ssize_t regulator_opmode_show(struct device *dev,
375 struct device_attribute *attr, char *buf)
377 struct regulator_dev *rdev = dev_get_drvdata(dev);
379 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
381 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
383 static ssize_t regulator_print_state(char *buf, int state)
386 return sprintf(buf, "enabled\n");
388 return sprintf(buf, "disabled\n");
390 return sprintf(buf, "unknown\n");
393 static ssize_t regulator_state_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
396 struct regulator_dev *rdev = dev_get_drvdata(dev);
399 mutex_lock(&rdev->mutex);
400 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
401 mutex_unlock(&rdev->mutex);
405 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
407 static ssize_t regulator_status_show(struct device *dev,
408 struct device_attribute *attr, char *buf)
410 struct regulator_dev *rdev = dev_get_drvdata(dev);
414 status = rdev->desc->ops->get_status(rdev);
419 case REGULATOR_STATUS_OFF:
422 case REGULATOR_STATUS_ON:
425 case REGULATOR_STATUS_ERROR:
428 case REGULATOR_STATUS_FAST:
431 case REGULATOR_STATUS_NORMAL:
434 case REGULATOR_STATUS_IDLE:
437 case REGULATOR_STATUS_STANDBY:
440 case REGULATOR_STATUS_BYPASS:
443 case REGULATOR_STATUS_UNDEFINED:
450 return sprintf(buf, "%s\n", label);
452 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
454 static ssize_t regulator_min_uA_show(struct device *dev,
455 struct device_attribute *attr, char *buf)
457 struct regulator_dev *rdev = dev_get_drvdata(dev);
459 if (!rdev->constraints)
460 return sprintf(buf, "constraint not defined\n");
462 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
464 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
466 static ssize_t regulator_max_uA_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
469 struct regulator_dev *rdev = dev_get_drvdata(dev);
471 if (!rdev->constraints)
472 return sprintf(buf, "constraint not defined\n");
474 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
476 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
478 static ssize_t regulator_min_uV_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
483 if (!rdev->constraints)
484 return sprintf(buf, "constraint not defined\n");
486 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
488 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
490 static ssize_t regulator_max_uV_show(struct device *dev,
491 struct device_attribute *attr, char *buf)
493 struct regulator_dev *rdev = dev_get_drvdata(dev);
495 if (!rdev->constraints)
496 return sprintf(buf, "constraint not defined\n");
498 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
500 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
502 static ssize_t regulator_total_uA_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
506 struct regulator *regulator;
509 mutex_lock(&rdev->mutex);
510 list_for_each_entry(regulator, &rdev->consumer_list, list)
511 uA += regulator->uA_load;
512 mutex_unlock(&rdev->mutex);
513 return sprintf(buf, "%d\n", uA);
515 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
517 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
520 struct regulator_dev *rdev = dev_get_drvdata(dev);
521 return sprintf(buf, "%d\n", rdev->use_count);
523 static DEVICE_ATTR_RO(num_users);
525 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
528 struct regulator_dev *rdev = dev_get_drvdata(dev);
530 switch (rdev->desc->type) {
531 case REGULATOR_VOLTAGE:
532 return sprintf(buf, "voltage\n");
533 case REGULATOR_CURRENT:
534 return sprintf(buf, "current\n");
536 return sprintf(buf, "unknown\n");
538 static DEVICE_ATTR_RO(type);
540 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
543 struct regulator_dev *rdev = dev_get_drvdata(dev);
545 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
547 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
548 regulator_suspend_mem_uV_show, NULL);
550 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
551 struct device_attribute *attr, char *buf)
553 struct regulator_dev *rdev = dev_get_drvdata(dev);
555 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
557 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
558 regulator_suspend_disk_uV_show, NULL);
560 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
561 struct device_attribute *attr, char *buf)
563 struct regulator_dev *rdev = dev_get_drvdata(dev);
565 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
567 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
568 regulator_suspend_standby_uV_show, NULL);
570 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
571 struct device_attribute *attr, char *buf)
573 struct regulator_dev *rdev = dev_get_drvdata(dev);
575 return regulator_print_opmode(buf,
576 rdev->constraints->state_mem.mode);
578 static DEVICE_ATTR(suspend_mem_mode, 0444,
579 regulator_suspend_mem_mode_show, NULL);
581 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
584 struct regulator_dev *rdev = dev_get_drvdata(dev);
586 return regulator_print_opmode(buf,
587 rdev->constraints->state_disk.mode);
589 static DEVICE_ATTR(suspend_disk_mode, 0444,
590 regulator_suspend_disk_mode_show, NULL);
592 static ssize_t regulator_suspend_standby_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_standby.mode);
600 static DEVICE_ATTR(suspend_standby_mode, 0444,
601 regulator_suspend_standby_mode_show, NULL);
603 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
604 struct device_attribute *attr, char *buf)
606 struct regulator_dev *rdev = dev_get_drvdata(dev);
608 return regulator_print_state(buf,
609 rdev->constraints->state_mem.enabled);
611 static DEVICE_ATTR(suspend_mem_state, 0444,
612 regulator_suspend_mem_state_show, NULL);
614 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
617 struct regulator_dev *rdev = dev_get_drvdata(dev);
619 return regulator_print_state(buf,
620 rdev->constraints->state_disk.enabled);
622 static DEVICE_ATTR(suspend_disk_state, 0444,
623 regulator_suspend_disk_state_show, NULL);
625 static ssize_t regulator_suspend_standby_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_standby.enabled);
633 static DEVICE_ATTR(suspend_standby_state, 0444,
634 regulator_suspend_standby_state_show, NULL);
636 static ssize_t regulator_bypass_show(struct device *dev,
637 struct device_attribute *attr, char *buf)
639 struct regulator_dev *rdev = dev_get_drvdata(dev);
644 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
653 return sprintf(buf, "%s\n", report);
655 static DEVICE_ATTR(bypass, 0444,
656 regulator_bypass_show, NULL);
658 /* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660 static int drms_uA_update(struct regulator_dev *rdev)
662 struct regulator *sibling;
663 int current_uA = 0, output_uV, input_uV, err;
666 lockdep_assert_held_once(&rdev->mutex);
669 * first check to see if we can set modes at all, otherwise just
670 * tell the consumer everything is OK.
672 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
675 if (!rdev->desc->ops->get_optimum_mode &&
676 !rdev->desc->ops->set_load)
679 if (!rdev->desc->ops->set_mode &&
680 !rdev->desc->ops->set_load)
683 /* calc total requested load */
684 list_for_each_entry(sibling, &rdev->consumer_list, list)
685 current_uA += sibling->uA_load;
687 current_uA += rdev->constraints->system_load;
689 if (rdev->desc->ops->set_load) {
690 /* set the optimum mode for our new total regulator load */
691 err = rdev->desc->ops->set_load(rdev, current_uA);
693 rdev_err(rdev, "failed to set load %d\n", current_uA);
695 /* get output voltage */
696 output_uV = _regulator_get_voltage(rdev);
697 if (output_uV <= 0) {
698 rdev_err(rdev, "invalid output voltage found\n");
702 /* get input voltage */
705 input_uV = regulator_get_voltage(rdev->supply);
707 input_uV = rdev->constraints->input_uV;
709 rdev_err(rdev, "invalid input voltage found\n");
713 /* now get the optimum mode for our new total regulator load */
714 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
715 output_uV, current_uA);
717 /* check the new mode is allowed */
718 err = regulator_mode_constrain(rdev, &mode);
720 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
721 current_uA, input_uV, output_uV);
725 err = rdev->desc->ops->set_mode(rdev, mode);
727 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
733 static int suspend_set_state(struct regulator_dev *rdev,
734 struct regulator_state *rstate)
738 /* If we have no suspend mode configration don't set anything;
739 * only warn if the driver implements set_suspend_voltage or
740 * set_suspend_mode callback.
742 if (!rstate->enabled && !rstate->disabled) {
743 if (rdev->desc->ops->set_suspend_voltage ||
744 rdev->desc->ops->set_suspend_mode)
745 rdev_warn(rdev, "No configuration\n");
749 if (rstate->enabled && rstate->disabled) {
750 rdev_err(rdev, "invalid configuration\n");
754 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
755 ret = rdev->desc->ops->set_suspend_enable(rdev);
756 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
757 ret = rdev->desc->ops->set_suspend_disable(rdev);
758 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
762 rdev_err(rdev, "failed to enabled/disable\n");
766 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
767 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
769 rdev_err(rdev, "failed to set voltage\n");
774 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
775 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
777 rdev_err(rdev, "failed to set mode\n");
784 /* locks held by caller */
785 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
787 if (!rdev->constraints)
791 case PM_SUSPEND_STANDBY:
792 return suspend_set_state(rdev,
793 &rdev->constraints->state_standby);
795 return suspend_set_state(rdev,
796 &rdev->constraints->state_mem);
798 return suspend_set_state(rdev,
799 &rdev->constraints->state_disk);
805 static void print_constraints(struct regulator_dev *rdev)
807 struct regulation_constraints *constraints = rdev->constraints;
809 size_t len = sizeof(buf) - 1;
813 if (constraints->min_uV && constraints->max_uV) {
814 if (constraints->min_uV == constraints->max_uV)
815 count += scnprintf(buf + count, len - count, "%d mV ",
816 constraints->min_uV / 1000);
818 count += scnprintf(buf + count, len - count,
820 constraints->min_uV / 1000,
821 constraints->max_uV / 1000);
824 if (!constraints->min_uV ||
825 constraints->min_uV != constraints->max_uV) {
826 ret = _regulator_get_voltage(rdev);
828 count += scnprintf(buf + count, len - count,
829 "at %d mV ", ret / 1000);
832 if (constraints->uV_offset)
833 count += scnprintf(buf + count, len - count, "%dmV offset ",
834 constraints->uV_offset / 1000);
836 if (constraints->min_uA && constraints->max_uA) {
837 if (constraints->min_uA == constraints->max_uA)
838 count += scnprintf(buf + count, len - count, "%d mA ",
839 constraints->min_uA / 1000);
841 count += scnprintf(buf + count, len - count,
843 constraints->min_uA / 1000,
844 constraints->max_uA / 1000);
847 if (!constraints->min_uA ||
848 constraints->min_uA != constraints->max_uA) {
849 ret = _regulator_get_current_limit(rdev);
851 count += scnprintf(buf + count, len - count,
852 "at %d mA ", ret / 1000);
855 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
856 count += scnprintf(buf + count, len - count, "fast ");
857 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
858 count += scnprintf(buf + count, len - count, "normal ");
859 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
860 count += scnprintf(buf + count, len - count, "idle ");
861 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
862 count += scnprintf(buf + count, len - count, "standby");
865 scnprintf(buf, len, "no parameters");
867 rdev_dbg(rdev, "%s\n", buf);
869 if ((constraints->min_uV != constraints->max_uV) &&
870 !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
872 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
875 static int machine_constraints_voltage(struct regulator_dev *rdev,
876 struct regulation_constraints *constraints)
878 const struct regulator_ops *ops = rdev->desc->ops;
881 /* do we need to apply the constraint voltage */
882 if (rdev->constraints->apply_uV &&
883 rdev->constraints->min_uV && rdev->constraints->max_uV) {
884 int target_min, target_max;
885 int current_uV = _regulator_get_voltage(rdev);
886 if (current_uV < 0) {
888 "failed to get the current voltage(%d)\n",
894 * If we're below the minimum voltage move up to the
895 * minimum voltage, if we're above the maximum voltage
896 * then move down to the maximum.
898 target_min = current_uV;
899 target_max = current_uV;
901 if (current_uV < rdev->constraints->min_uV) {
902 target_min = rdev->constraints->min_uV;
903 target_max = rdev->constraints->min_uV;
906 if (current_uV > rdev->constraints->max_uV) {
907 target_min = rdev->constraints->max_uV;
908 target_max = rdev->constraints->max_uV;
911 if (target_min != current_uV || target_max != current_uV) {
912 rdev_info(rdev, "Bringing %duV into %d-%duV\n",
913 current_uV, target_min, target_max);
914 ret = _regulator_do_set_voltage(
915 rdev, target_min, target_max);
918 "failed to apply %d-%duV constraint(%d)\n",
919 target_min, target_max, ret);
925 /* constrain machine-level voltage specs to fit
926 * the actual range supported by this regulator.
928 if (ops->list_voltage && rdev->desc->n_voltages) {
929 int count = rdev->desc->n_voltages;
931 int min_uV = INT_MAX;
932 int max_uV = INT_MIN;
933 int cmin = constraints->min_uV;
934 int cmax = constraints->max_uV;
936 /* it's safe to autoconfigure fixed-voltage supplies
937 and the constraints are used by list_voltage. */
938 if (count == 1 && !cmin) {
941 constraints->min_uV = cmin;
942 constraints->max_uV = cmax;
945 /* voltage constraints are optional */
946 if ((cmin == 0) && (cmax == 0))
949 /* else require explicit machine-level constraints */
950 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
951 rdev_err(rdev, "invalid voltage constraints\n");
955 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
956 for (i = 0; i < count; i++) {
959 value = ops->list_voltage(rdev, i);
963 /* maybe adjust [min_uV..max_uV] */
964 if (value >= cmin && value < min_uV)
966 if (value <= cmax && value > max_uV)
970 /* final: [min_uV..max_uV] valid iff constraints valid */
971 if (max_uV < min_uV) {
973 "unsupportable voltage constraints %u-%uuV\n",
978 /* use regulator's subset of machine constraints */
979 if (constraints->min_uV < min_uV) {
980 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
981 constraints->min_uV, min_uV);
982 constraints->min_uV = min_uV;
984 if (constraints->max_uV > max_uV) {
985 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
986 constraints->max_uV, max_uV);
987 constraints->max_uV = max_uV;
994 static int machine_constraints_current(struct regulator_dev *rdev,
995 struct regulation_constraints *constraints)
997 const struct regulator_ops *ops = rdev->desc->ops;
1000 if (!constraints->min_uA && !constraints->max_uA)
1003 if (constraints->min_uA > constraints->max_uA) {
1004 rdev_err(rdev, "Invalid current constraints\n");
1008 if (!ops->set_current_limit || !ops->get_current_limit) {
1009 rdev_warn(rdev, "Operation of current configuration missing\n");
1013 /* Set regulator current in constraints range */
1014 ret = ops->set_current_limit(rdev, constraints->min_uA,
1015 constraints->max_uA);
1017 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1024 static int _regulator_do_enable(struct regulator_dev *rdev);
1027 * set_machine_constraints - sets regulator constraints
1028 * @rdev: regulator source
1030 * Allows platform initialisation code to define and constrain
1031 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
1032 * Constraints *must* be set by platform code in order for some
1033 * regulator operations to proceed i.e. set_voltage, set_current_limit,
1036 static int set_machine_constraints(struct regulator_dev *rdev)
1039 const struct regulator_ops *ops = rdev->desc->ops;
1041 ret = machine_constraints_voltage(rdev, rdev->constraints);
1045 ret = machine_constraints_current(rdev, rdev->constraints);
1049 if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1050 ret = ops->set_input_current_limit(rdev,
1051 rdev->constraints->ilim_uA);
1053 rdev_err(rdev, "failed to set input limit\n");
1058 /* do we need to setup our suspend state */
1059 if (rdev->constraints->initial_state) {
1060 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1062 rdev_err(rdev, "failed to set suspend state\n");
1067 if (rdev->constraints->initial_mode) {
1068 if (!ops->set_mode) {
1069 rdev_err(rdev, "no set_mode operation\n");
1073 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1075 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1080 /* If the constraints say the regulator should be on at this point
1081 * and we have control then make sure it is enabled.
1083 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1084 /* If we want to enable this regulator, make sure that we know
1085 * the supplying regulator.
1087 if (rdev->supply_name && !rdev->supply)
1088 return -EPROBE_DEFER;
1090 ret = _regulator_do_enable(rdev);
1091 if (ret < 0 && ret != -EINVAL) {
1092 rdev_err(rdev, "failed to enable\n");
1097 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1098 && ops->set_ramp_delay) {
1099 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1101 rdev_err(rdev, "failed to set ramp_delay\n");
1106 if (rdev->constraints->pull_down && ops->set_pull_down) {
1107 ret = ops->set_pull_down(rdev);
1109 rdev_err(rdev, "failed to set pull down\n");
1114 if (rdev->constraints->soft_start && ops->set_soft_start) {
1115 ret = ops->set_soft_start(rdev);
1117 rdev_err(rdev, "failed to set soft start\n");
1122 if (rdev->constraints->over_current_protection
1123 && ops->set_over_current_protection) {
1124 ret = ops->set_over_current_protection(rdev);
1126 rdev_err(rdev, "failed to set over current protection\n");
1131 if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1132 bool ad_state = (rdev->constraints->active_discharge ==
1133 REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1135 ret = ops->set_active_discharge(rdev, ad_state);
1137 rdev_err(rdev, "failed to set active discharge\n");
1142 print_constraints(rdev);
1147 * set_supply - set regulator supply regulator
1148 * @rdev: regulator name
1149 * @supply_rdev: supply regulator name
1151 * Called by platform initialisation code to set the supply regulator for this
1152 * regulator. This ensures that a regulators supply will also be enabled by the
1153 * core if it's child is enabled.
1155 static int set_supply(struct regulator_dev *rdev,
1156 struct regulator_dev *supply_rdev)
1160 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1162 if (!try_module_get(supply_rdev->owner))
1165 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1166 if (rdev->supply == NULL) {
1170 supply_rdev->open_count++;
1176 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1177 * @rdev: regulator source
1178 * @consumer_dev_name: dev_name() string for device supply applies to
1179 * @supply: symbolic name for supply
1181 * Allows platform initialisation code to map physical regulator
1182 * sources to symbolic names for supplies for use by devices. Devices
1183 * should use these symbolic names to request regulators, avoiding the
1184 * need to provide board-specific regulator names as platform data.
1186 static int set_consumer_device_supply(struct regulator_dev *rdev,
1187 const char *consumer_dev_name,
1190 struct regulator_map *node, *new_node;
1196 if (consumer_dev_name != NULL)
1201 new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1202 if (new_node == NULL)
1205 new_node->regulator = rdev;
1206 new_node->supply = supply;
1209 new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1210 if (new_node->dev_name == NULL) {
1216 mutex_lock(®ulator_list_mutex);
1217 list_for_each_entry(node, ®ulator_map_list, list) {
1218 if (node->dev_name && consumer_dev_name) {
1219 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1221 } else if (node->dev_name || consumer_dev_name) {
1225 if (strcmp(node->supply, supply) != 0)
1228 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1230 dev_name(&node->regulator->dev),
1231 node->regulator->desc->name,
1233 dev_name(&rdev->dev), rdev_get_name(rdev));
1237 list_add(&new_node->list, ®ulator_map_list);
1238 mutex_unlock(®ulator_list_mutex);
1243 mutex_unlock(®ulator_list_mutex);
1244 kfree(new_node->dev_name);
1249 static void unset_regulator_supplies(struct regulator_dev *rdev)
1251 struct regulator_map *node, *n;
1253 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1254 if (rdev == node->regulator) {
1255 list_del(&node->list);
1256 kfree(node->dev_name);
1262 #ifdef CONFIG_DEBUG_FS
1263 static ssize_t constraint_flags_read_file(struct file *file,
1264 char __user *user_buf,
1265 size_t count, loff_t *ppos)
1267 const struct regulator *regulator = file->private_data;
1268 const struct regulation_constraints *c = regulator->rdev->constraints;
1275 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1279 ret = snprintf(buf, PAGE_SIZE,
1283 "ramp_disable: %u\n"
1286 "over_current_protection: %u\n",
1293 c->over_current_protection);
1295 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1303 static const struct file_operations constraint_flags_fops = {
1304 #ifdef CONFIG_DEBUG_FS
1305 .open = simple_open,
1306 .read = constraint_flags_read_file,
1307 .llseek = default_llseek,
1311 #define REG_STR_SIZE 64
1313 static struct regulator *create_regulator(struct regulator_dev *rdev,
1315 const char *supply_name)
1317 struct regulator *regulator;
1318 char buf[REG_STR_SIZE];
1321 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1322 if (regulator == NULL)
1325 mutex_lock(&rdev->mutex);
1326 regulator->rdev = rdev;
1327 list_add(®ulator->list, &rdev->consumer_list);
1330 regulator->dev = dev;
1332 /* Add a link to the device sysfs entry */
1333 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1334 dev->kobj.name, supply_name);
1335 if (size >= REG_STR_SIZE)
1338 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1339 if (regulator->supply_name == NULL)
1342 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1345 rdev_dbg(rdev, "could not add device link %s err %d\n",
1346 dev->kobj.name, err);
1350 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1351 if (regulator->supply_name == NULL)
1355 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1357 if (!regulator->debugfs) {
1358 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1360 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1361 ®ulator->uA_load);
1362 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1363 ®ulator->min_uV);
1364 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1365 ®ulator->max_uV);
1366 debugfs_create_file("constraint_flags", 0444,
1367 regulator->debugfs, regulator,
1368 &constraint_flags_fops);
1372 * Check now if the regulator is an always on regulator - if
1373 * it is then we don't need to do nearly so much work for
1374 * enable/disable calls.
1376 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1377 _regulator_is_enabled(rdev))
1378 regulator->always_on = true;
1380 mutex_unlock(&rdev->mutex);
1383 list_del(®ulator->list);
1385 mutex_unlock(&rdev->mutex);
1389 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1391 if (rdev->constraints && rdev->constraints->enable_time)
1392 return rdev->constraints->enable_time;
1393 if (!rdev->desc->ops->enable_time)
1394 return rdev->desc->enable_time;
1395 return rdev->desc->ops->enable_time(rdev);
1398 static struct regulator_supply_alias *regulator_find_supply_alias(
1399 struct device *dev, const char *supply)
1401 struct regulator_supply_alias *map;
1403 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1404 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1410 static void regulator_supply_alias(struct device **dev, const char **supply)
1412 struct regulator_supply_alias *map;
1414 map = regulator_find_supply_alias(*dev, *supply);
1416 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1417 *supply, map->alias_supply,
1418 dev_name(map->alias_dev));
1419 *dev = map->alias_dev;
1420 *supply = map->alias_supply;
1424 static int of_node_match(struct device *dev, const void *data)
1426 return dev->of_node == data;
1429 static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1433 dev = class_find_device(®ulator_class, NULL, np, of_node_match);
1435 return dev ? dev_to_rdev(dev) : NULL;
1438 static int regulator_match(struct device *dev, const void *data)
1440 struct regulator_dev *r = dev_to_rdev(dev);
1442 return strcmp(rdev_get_name(r), data) == 0;
1445 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1449 dev = class_find_device(®ulator_class, NULL, name, regulator_match);
1451 return dev ? dev_to_rdev(dev) : NULL;
1455 * regulator_dev_lookup - lookup a regulator device.
1456 * @dev: device for regulator "consumer".
1457 * @supply: Supply name or regulator ID.
1459 * If successful, returns a struct regulator_dev that corresponds to the name
1460 * @supply and with the embedded struct device refcount incremented by one.
1461 * The refcount must be dropped by calling put_device().
1462 * On failure one of the following ERR-PTR-encoded values is returned:
1463 * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1466 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1469 struct regulator_dev *r = NULL;
1470 struct device_node *node;
1471 struct regulator_map *map;
1472 const char *devname = NULL;
1474 regulator_supply_alias(&dev, &supply);
1476 /* first do a dt based lookup */
1477 if (dev && dev->of_node) {
1478 node = of_get_regulator(dev, supply);
1480 r = of_find_regulator_by_node(node);
1485 * We have a node, but there is no device.
1486 * assume it has not registered yet.
1488 return ERR_PTR(-EPROBE_DEFER);
1492 /* if not found, try doing it non-dt way */
1494 devname = dev_name(dev);
1496 mutex_lock(®ulator_list_mutex);
1497 list_for_each_entry(map, ®ulator_map_list, list) {
1498 /* If the mapping has a device set up it must match */
1499 if (map->dev_name &&
1500 (!devname || strcmp(map->dev_name, devname)))
1503 if (strcmp(map->supply, supply) == 0 &&
1504 get_device(&map->regulator->dev)) {
1509 mutex_unlock(®ulator_list_mutex);
1514 r = regulator_lookup_by_name(supply);
1518 return ERR_PTR(-ENODEV);
1521 static int regulator_resolve_supply(struct regulator_dev *rdev)
1523 struct regulator_dev *r;
1524 struct device *dev = rdev->dev.parent;
1527 /* No supply to resovle? */
1528 if (!rdev->supply_name)
1531 /* Supply already resolved? */
1535 r = regulator_dev_lookup(dev, rdev->supply_name);
1539 /* Did the lookup explicitly defer for us? */
1540 if (ret == -EPROBE_DEFER)
1543 if (have_full_constraints()) {
1544 r = dummy_regulator_rdev;
1545 get_device(&r->dev);
1547 dev_err(dev, "Failed to resolve %s-supply for %s\n",
1548 rdev->supply_name, rdev->desc->name);
1549 return -EPROBE_DEFER;
1554 dev_err(dev, "Supply for %s (%s) resolved to itself\n",
1555 rdev->desc->name, rdev->supply_name);
1556 if (!have_full_constraints())
1558 r = dummy_regulator_rdev;
1559 get_device(&r->dev);
1563 * If the supply's parent device is not the same as the
1564 * regulator's parent device, then ensure the parent device
1565 * is bound before we resolve the supply, in case the parent
1566 * device get probe deferred and unregisters the supply.
1568 if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1569 if (!device_is_bound(r->dev.parent)) {
1570 put_device(&r->dev);
1571 return -EPROBE_DEFER;
1575 /* Recursively resolve the supply of the supply */
1576 ret = regulator_resolve_supply(r);
1578 put_device(&r->dev);
1582 ret = set_supply(rdev, r);
1584 put_device(&r->dev);
1588 /* Cascade always-on state to supply */
1589 if (_regulator_is_enabled(rdev)) {
1590 ret = regulator_enable(rdev->supply);
1592 _regulator_put(rdev->supply);
1593 rdev->supply = NULL;
1601 /* Internal regulator request function */
1602 struct regulator *_regulator_get(struct device *dev, const char *id,
1603 enum regulator_get_type get_type)
1605 struct regulator_dev *rdev;
1606 struct regulator *regulator;
1607 const char *devname = dev ? dev_name(dev) : "deviceless";
1610 if (get_type >= MAX_GET_TYPE) {
1611 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1612 return ERR_PTR(-EINVAL);
1616 pr_err("get() with no identifier\n");
1617 return ERR_PTR(-EINVAL);
1620 rdev = regulator_dev_lookup(dev, id);
1622 ret = PTR_ERR(rdev);
1625 * If regulator_dev_lookup() fails with error other
1626 * than -ENODEV our job here is done, we simply return it.
1629 return ERR_PTR(ret);
1631 if (!have_full_constraints()) {
1633 "incomplete constraints, dummy supplies not allowed\n");
1634 return ERR_PTR(-ENODEV);
1640 * Assume that a regulator is physically present and
1641 * enabled, even if it isn't hooked up, and just
1645 "%s supply %s not found, using dummy regulator\n",
1647 rdev = dummy_regulator_rdev;
1648 get_device(&rdev->dev);
1653 "dummy supplies not allowed for exclusive requests\n");
1657 return ERR_PTR(-ENODEV);
1661 if (rdev->exclusive) {
1662 regulator = ERR_PTR(-EPERM);
1663 put_device(&rdev->dev);
1667 if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1668 regulator = ERR_PTR(-EBUSY);
1669 put_device(&rdev->dev);
1673 ret = regulator_resolve_supply(rdev);
1675 regulator = ERR_PTR(ret);
1676 put_device(&rdev->dev);
1680 if (!try_module_get(rdev->owner)) {
1681 regulator = ERR_PTR(-EPROBE_DEFER);
1682 put_device(&rdev->dev);
1686 regulator = create_regulator(rdev, dev, id);
1687 if (regulator == NULL) {
1688 regulator = ERR_PTR(-ENOMEM);
1689 put_device(&rdev->dev);
1690 module_put(rdev->owner);
1695 if (get_type == EXCLUSIVE_GET) {
1696 rdev->exclusive = 1;
1698 ret = _regulator_is_enabled(rdev);
1700 rdev->use_count = 1;
1702 rdev->use_count = 0;
1709 * regulator_get - lookup and obtain a reference to a regulator.
1710 * @dev: device for regulator "consumer"
1711 * @id: Supply name or regulator ID.
1713 * Returns a struct regulator corresponding to the regulator producer,
1714 * or IS_ERR() condition containing errno.
1716 * Use of supply names configured via regulator_set_device_supply() is
1717 * strongly encouraged. It is recommended that the supply name used
1718 * should match the name used for the supply and/or the relevant
1719 * device pins in the datasheet.
1721 struct regulator *regulator_get(struct device *dev, const char *id)
1723 return _regulator_get(dev, id, NORMAL_GET);
1725 EXPORT_SYMBOL_GPL(regulator_get);
1728 * regulator_get_exclusive - obtain exclusive access to a regulator.
1729 * @dev: device for regulator "consumer"
1730 * @id: Supply name or regulator ID.
1732 * Returns a struct regulator corresponding to the regulator producer,
1733 * or IS_ERR() condition containing errno. Other consumers will be
1734 * unable to obtain this regulator while this reference is held and the
1735 * use count for the regulator will be initialised to reflect the current
1736 * state of the regulator.
1738 * This is intended for use by consumers which cannot tolerate shared
1739 * use of the regulator such as those which need to force the
1740 * regulator off for correct operation of the hardware they are
1743 * Use of supply names configured via regulator_set_device_supply() is
1744 * strongly encouraged. It is recommended that the supply name used
1745 * should match the name used for the supply and/or the relevant
1746 * device pins in the datasheet.
1748 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1750 return _regulator_get(dev, id, EXCLUSIVE_GET);
1752 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1755 * regulator_get_optional - obtain optional access to a regulator.
1756 * @dev: device for regulator "consumer"
1757 * @id: Supply name or regulator ID.
1759 * Returns a struct regulator corresponding to the regulator producer,
1760 * or IS_ERR() condition containing errno.
1762 * This is intended for use by consumers for devices which can have
1763 * some supplies unconnected in normal use, such as some MMC devices.
1764 * It can allow the regulator core to provide stub supplies for other
1765 * supplies requested using normal regulator_get() calls without
1766 * disrupting the operation of drivers that can handle absent
1769 * Use of supply names configured via regulator_set_device_supply() is
1770 * strongly encouraged. It is recommended that the supply name used
1771 * should match the name used for the supply and/or the relevant
1772 * device pins in the datasheet.
1774 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1776 return _regulator_get(dev, id, OPTIONAL_GET);
1778 EXPORT_SYMBOL_GPL(regulator_get_optional);
1780 /* regulator_list_mutex lock held by regulator_put() */
1781 static void _regulator_put(struct regulator *regulator)
1783 struct regulator_dev *rdev;
1785 if (IS_ERR_OR_NULL(regulator))
1788 lockdep_assert_held_once(®ulator_list_mutex);
1790 rdev = regulator->rdev;
1792 debugfs_remove_recursive(regulator->debugfs);
1794 /* remove any sysfs entries */
1796 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1797 mutex_lock(&rdev->mutex);
1798 list_del(®ulator->list);
1801 rdev->exclusive = 0;
1802 put_device(&rdev->dev);
1803 mutex_unlock(&rdev->mutex);
1805 kfree_const(regulator->supply_name);
1808 module_put(rdev->owner);
1812 * regulator_put - "free" the regulator source
1813 * @regulator: regulator source
1815 * Note: drivers must ensure that all regulator_enable calls made on this
1816 * regulator source are balanced by regulator_disable calls prior to calling
1819 void regulator_put(struct regulator *regulator)
1821 mutex_lock(®ulator_list_mutex);
1822 _regulator_put(regulator);
1823 mutex_unlock(®ulator_list_mutex);
1825 EXPORT_SYMBOL_GPL(regulator_put);
1828 * regulator_register_supply_alias - Provide device alias for supply lookup
1830 * @dev: device that will be given as the regulator "consumer"
1831 * @id: Supply name or regulator ID
1832 * @alias_dev: device that should be used to lookup the supply
1833 * @alias_id: Supply name or regulator ID that should be used to lookup the
1836 * All lookups for id on dev will instead be conducted for alias_id on
1839 int regulator_register_supply_alias(struct device *dev, const char *id,
1840 struct device *alias_dev,
1841 const char *alias_id)
1843 struct regulator_supply_alias *map;
1845 map = regulator_find_supply_alias(dev, id);
1849 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1854 map->src_supply = id;
1855 map->alias_dev = alias_dev;
1856 map->alias_supply = alias_id;
1858 list_add(&map->list, ®ulator_supply_alias_list);
1860 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1861 id, dev_name(dev), alias_id, dev_name(alias_dev));
1865 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1868 * regulator_unregister_supply_alias - Remove device alias
1870 * @dev: device that will be given as the regulator "consumer"
1871 * @id: Supply name or regulator ID
1873 * Remove a lookup alias if one exists for id on dev.
1875 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1877 struct regulator_supply_alias *map;
1879 map = regulator_find_supply_alias(dev, id);
1881 list_del(&map->list);
1885 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1888 * regulator_bulk_register_supply_alias - register multiple aliases
1890 * @dev: device that will be given as the regulator "consumer"
1891 * @id: List of supply names or regulator IDs
1892 * @alias_dev: device that should be used to lookup the supply
1893 * @alias_id: List of supply names or regulator IDs that should be used to
1895 * @num_id: Number of aliases to register
1897 * @return 0 on success, an errno on failure.
1899 * This helper function allows drivers to register several supply
1900 * aliases in one operation. If any of the aliases cannot be
1901 * registered any aliases that were registered will be removed
1902 * before returning to the caller.
1904 int regulator_bulk_register_supply_alias(struct device *dev,
1905 const char *const *id,
1906 struct device *alias_dev,
1907 const char *const *alias_id,
1913 for (i = 0; i < num_id; ++i) {
1914 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1924 "Failed to create supply alias %s,%s -> %s,%s\n",
1925 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1928 regulator_unregister_supply_alias(dev, id[i]);
1932 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1935 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1937 * @dev: device that will be given as the regulator "consumer"
1938 * @id: List of supply names or regulator IDs
1939 * @num_id: Number of aliases to unregister
1941 * This helper function allows drivers to unregister several supply
1942 * aliases in one operation.
1944 void regulator_bulk_unregister_supply_alias(struct device *dev,
1945 const char *const *id,
1950 for (i = 0; i < num_id; ++i)
1951 regulator_unregister_supply_alias(dev, id[i]);
1953 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1956 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1957 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1958 const struct regulator_config *config)
1960 struct regulator_enable_gpio *pin;
1961 struct gpio_desc *gpiod;
1964 gpiod = gpio_to_desc(config->ena_gpio);
1966 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1967 if (pin->gpiod == gpiod) {
1968 rdev_dbg(rdev, "GPIO %d is already used\n",
1970 goto update_ena_gpio_to_rdev;
1974 ret = gpio_request_one(config->ena_gpio,
1975 GPIOF_DIR_OUT | config->ena_gpio_flags,
1976 rdev_get_name(rdev));
1980 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1982 gpio_free(config->ena_gpio);
1987 pin->ena_gpio_invert = config->ena_gpio_invert;
1988 list_add(&pin->list, ®ulator_ena_gpio_list);
1990 update_ena_gpio_to_rdev:
1991 pin->request_count++;
1992 rdev->ena_pin = pin;
1996 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1998 struct regulator_enable_gpio *pin, *n;
2003 /* Free the GPIO only in case of no use */
2004 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
2005 if (pin->gpiod == rdev->ena_pin->gpiod) {
2006 if (pin->request_count <= 1) {
2007 pin->request_count = 0;
2008 gpiod_put(pin->gpiod);
2009 list_del(&pin->list);
2011 rdev->ena_pin = NULL;
2014 pin->request_count--;
2021 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2022 * @rdev: regulator_dev structure
2023 * @enable: enable GPIO at initial use?
2025 * GPIO is enabled in case of initial use. (enable_count is 0)
2026 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2028 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2030 struct regulator_enable_gpio *pin = rdev->ena_pin;
2036 /* Enable GPIO at initial use */
2037 if (pin->enable_count == 0)
2038 gpiod_set_value_cansleep(pin->gpiod,
2039 !pin->ena_gpio_invert);
2041 pin->enable_count++;
2043 if (pin->enable_count > 1) {
2044 pin->enable_count--;
2048 /* Disable GPIO if not used */
2049 if (pin->enable_count <= 1) {
2050 gpiod_set_value_cansleep(pin->gpiod,
2051 pin->ena_gpio_invert);
2052 pin->enable_count = 0;
2060 * _regulator_enable_delay - a delay helper function
2061 * @delay: time to delay in microseconds
2063 * Delay for the requested amount of time as per the guidelines in:
2065 * Documentation/timers/timers-howto.txt
2067 * The assumption here is that regulators will never be enabled in
2068 * atomic context and therefore sleeping functions can be used.
2070 static void _regulator_enable_delay(unsigned int delay)
2072 unsigned int ms = delay / 1000;
2073 unsigned int us = delay % 1000;
2077 * For small enough values, handle super-millisecond
2078 * delays in the usleep_range() call below.
2087 * Give the scheduler some room to coalesce with any other
2088 * wakeup sources. For delays shorter than 10 us, don't even
2089 * bother setting up high-resolution timers and just busy-
2093 usleep_range(us, us + 100);
2098 static int _regulator_do_enable(struct regulator_dev *rdev)
2102 /* Query before enabling in case configuration dependent. */
2103 ret = _regulator_get_enable_time(rdev);
2107 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2111 trace_regulator_enable(rdev_get_name(rdev));
2113 if (rdev->desc->off_on_delay) {
2114 /* if needed, keep a distance of off_on_delay from last time
2115 * this regulator was disabled.
2117 unsigned long start_jiffy = jiffies;
2118 unsigned long intended, max_delay, remaining;
2120 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2121 intended = rdev->last_off_jiffy + max_delay;
2123 if (time_before(start_jiffy, intended)) {
2124 /* calc remaining jiffies to deal with one-time
2126 * in case of multiple timer wrapping, either it can be
2127 * detected by out-of-range remaining, or it cannot be
2128 * detected and we gets a panelty of
2129 * _regulator_enable_delay().
2131 remaining = intended - start_jiffy;
2132 if (remaining <= max_delay)
2133 _regulator_enable_delay(
2134 jiffies_to_usecs(remaining));
2138 if (rdev->ena_pin) {
2139 if (!rdev->ena_gpio_state) {
2140 ret = regulator_ena_gpio_ctrl(rdev, true);
2143 rdev->ena_gpio_state = 1;
2145 } else if (rdev->desc->ops->enable) {
2146 ret = rdev->desc->ops->enable(rdev);
2153 /* Allow the regulator to ramp; it would be useful to extend
2154 * this for bulk operations so that the regulators can ramp
2156 trace_regulator_enable_delay(rdev_get_name(rdev));
2158 _regulator_enable_delay(delay);
2160 trace_regulator_enable_complete(rdev_get_name(rdev));
2165 /* locks held by regulator_enable() */
2166 static int _regulator_enable(struct regulator_dev *rdev)
2170 lockdep_assert_held_once(&rdev->mutex);
2172 /* check voltage and requested load before enabling */
2173 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2174 drms_uA_update(rdev);
2176 if (rdev->use_count == 0) {
2177 /* The regulator may on if it's not switchable or left on */
2178 ret = _regulator_is_enabled(rdev);
2179 if (ret == -EINVAL || ret == 0) {
2180 if (!regulator_ops_is_valid(rdev,
2181 REGULATOR_CHANGE_STATUS))
2184 ret = _regulator_do_enable(rdev);
2188 _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2190 } else if (ret < 0) {
2191 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2194 /* Fallthrough on positive return values - already enabled */
2203 * regulator_enable - enable regulator output
2204 * @regulator: regulator source
2206 * Request that the regulator be enabled with the regulator output at
2207 * the predefined voltage or current value. Calls to regulator_enable()
2208 * must be balanced with calls to regulator_disable().
2210 * NOTE: the output value can be set by other drivers, boot loader or may be
2211 * hardwired in the regulator.
2213 int regulator_enable(struct regulator *regulator)
2215 struct regulator_dev *rdev = regulator->rdev;
2218 if (regulator->always_on)
2222 ret = regulator_enable(rdev->supply);
2227 mutex_lock(&rdev->mutex);
2228 ret = _regulator_enable(rdev);
2229 mutex_unlock(&rdev->mutex);
2231 if (ret != 0 && rdev->supply)
2232 regulator_disable(rdev->supply);
2236 EXPORT_SYMBOL_GPL(regulator_enable);
2238 static int _regulator_do_disable(struct regulator_dev *rdev)
2242 trace_regulator_disable(rdev_get_name(rdev));
2244 if (rdev->ena_pin) {
2245 if (rdev->ena_gpio_state) {
2246 ret = regulator_ena_gpio_ctrl(rdev, false);
2249 rdev->ena_gpio_state = 0;
2252 } else if (rdev->desc->ops->disable) {
2253 ret = rdev->desc->ops->disable(rdev);
2258 /* cares about last_off_jiffy only if off_on_delay is required by
2261 if (rdev->desc->off_on_delay)
2262 rdev->last_off_jiffy = jiffies;
2264 trace_regulator_disable_complete(rdev_get_name(rdev));
2269 /* locks held by regulator_disable() */
2270 static int _regulator_disable(struct regulator_dev *rdev)
2274 lockdep_assert_held_once(&rdev->mutex);
2276 if (WARN(rdev->use_count <= 0,
2277 "unbalanced disables for %s\n", rdev_get_name(rdev)))
2280 /* are we the last user and permitted to disable ? */
2281 if (rdev->use_count == 1 &&
2282 (rdev->constraints && !rdev->constraints->always_on)) {
2284 /* we are last user */
2285 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2286 ret = _notifier_call_chain(rdev,
2287 REGULATOR_EVENT_PRE_DISABLE,
2289 if (ret & NOTIFY_STOP_MASK)
2292 ret = _regulator_do_disable(rdev);
2294 rdev_err(rdev, "failed to disable\n");
2295 _notifier_call_chain(rdev,
2296 REGULATOR_EVENT_ABORT_DISABLE,
2300 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2304 rdev->use_count = 0;
2305 } else if (rdev->use_count > 1) {
2306 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2307 drms_uA_update(rdev);
2316 * regulator_disable - disable regulator output
2317 * @regulator: regulator source
2319 * Disable the regulator output voltage or current. Calls to
2320 * regulator_enable() must be balanced with calls to
2321 * regulator_disable().
2323 * NOTE: this will only disable the regulator output if no other consumer
2324 * devices have it enabled, the regulator device supports disabling and
2325 * machine constraints permit this operation.
2327 int regulator_disable(struct regulator *regulator)
2329 struct regulator_dev *rdev = regulator->rdev;
2332 if (regulator->always_on)
2335 mutex_lock(&rdev->mutex);
2336 ret = _regulator_disable(rdev);
2337 mutex_unlock(&rdev->mutex);
2339 if (ret == 0 && rdev->supply)
2340 regulator_disable(rdev->supply);
2344 EXPORT_SYMBOL_GPL(regulator_disable);
2346 /* locks held by regulator_force_disable() */
2347 static int _regulator_force_disable(struct regulator_dev *rdev)
2351 lockdep_assert_held_once(&rdev->mutex);
2353 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2354 REGULATOR_EVENT_PRE_DISABLE, NULL);
2355 if (ret & NOTIFY_STOP_MASK)
2358 ret = _regulator_do_disable(rdev);
2360 rdev_err(rdev, "failed to force disable\n");
2361 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2362 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2366 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2367 REGULATOR_EVENT_DISABLE, NULL);
2373 * regulator_force_disable - force disable regulator output
2374 * @regulator: regulator source
2376 * Forcibly disable the regulator output voltage or current.
2377 * NOTE: this *will* disable the regulator output even if other consumer
2378 * devices have it enabled. This should be used for situations when device
2379 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2381 int regulator_force_disable(struct regulator *regulator)
2383 struct regulator_dev *rdev = regulator->rdev;
2386 mutex_lock(&rdev->mutex);
2387 regulator->uA_load = 0;
2388 ret = _regulator_force_disable(regulator->rdev);
2389 mutex_unlock(&rdev->mutex);
2392 while (rdev->open_count--)
2393 regulator_disable(rdev->supply);
2397 EXPORT_SYMBOL_GPL(regulator_force_disable);
2399 static void regulator_disable_work(struct work_struct *work)
2401 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2405 mutex_lock(&rdev->mutex);
2407 BUG_ON(!rdev->deferred_disables);
2409 count = rdev->deferred_disables;
2410 rdev->deferred_disables = 0;
2413 * Workqueue functions queue the new work instance while the previous
2414 * work instance is being processed. Cancel the queued work instance
2415 * as the work instance under processing does the job of the queued
2418 cancel_delayed_work(&rdev->disable_work);
2420 for (i = 0; i < count; i++) {
2421 ret = _regulator_disable(rdev);
2423 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2426 mutex_unlock(&rdev->mutex);
2429 for (i = 0; i < count; i++) {
2430 ret = regulator_disable(rdev->supply);
2433 "Supply disable failed: %d\n", ret);
2440 * regulator_disable_deferred - disable regulator output with delay
2441 * @regulator: regulator source
2442 * @ms: miliseconds until the regulator is disabled
2444 * Execute regulator_disable() on the regulator after a delay. This
2445 * is intended for use with devices that require some time to quiesce.
2447 * NOTE: this will only disable the regulator output if no other consumer
2448 * devices have it enabled, the regulator device supports disabling and
2449 * machine constraints permit this operation.
2451 int regulator_disable_deferred(struct regulator *regulator, int ms)
2453 struct regulator_dev *rdev = regulator->rdev;
2455 if (regulator->always_on)
2459 return regulator_disable(regulator);
2461 mutex_lock(&rdev->mutex);
2462 rdev->deferred_disables++;
2463 mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2464 msecs_to_jiffies(ms));
2465 mutex_unlock(&rdev->mutex);
2469 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2471 static int _regulator_is_enabled(struct regulator_dev *rdev)
2473 /* A GPIO control always takes precedence */
2475 return rdev->ena_gpio_state;
2477 /* If we don't know then assume that the regulator is always on */
2478 if (!rdev->desc->ops->is_enabled)
2481 return rdev->desc->ops->is_enabled(rdev);
2484 static int _regulator_list_voltage(struct regulator *regulator,
2485 unsigned selector, int lock)
2487 struct regulator_dev *rdev = regulator->rdev;
2488 const struct regulator_ops *ops = rdev->desc->ops;
2491 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2492 return rdev->desc->fixed_uV;
2494 if (ops->list_voltage) {
2495 if (selector >= rdev->desc->n_voltages)
2498 mutex_lock(&rdev->mutex);
2499 ret = ops->list_voltage(rdev, selector);
2501 mutex_unlock(&rdev->mutex);
2502 } else if (rdev->is_switch && rdev->supply) {
2503 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2509 if (ret < rdev->constraints->min_uV)
2511 else if (ret > rdev->constraints->max_uV)
2519 * regulator_is_enabled - is the regulator output enabled
2520 * @regulator: regulator source
2522 * Returns positive if the regulator driver backing the source/client
2523 * has requested that the device be enabled, zero if it hasn't, else a
2524 * negative errno code.
2526 * Note that the device backing this regulator handle can have multiple
2527 * users, so it might be enabled even if regulator_enable() was never
2528 * called for this particular source.
2530 int regulator_is_enabled(struct regulator *regulator)
2534 if (regulator->always_on)
2537 mutex_lock(®ulator->rdev->mutex);
2538 ret = _regulator_is_enabled(regulator->rdev);
2539 mutex_unlock(®ulator->rdev->mutex);
2543 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2546 * regulator_count_voltages - count regulator_list_voltage() selectors
2547 * @regulator: regulator source
2549 * Returns number of selectors, or negative errno. Selectors are
2550 * numbered starting at zero, and typically correspond to bitfields
2551 * in hardware registers.
2553 int regulator_count_voltages(struct regulator *regulator)
2555 struct regulator_dev *rdev = regulator->rdev;
2557 if (rdev->desc->n_voltages)
2558 return rdev->desc->n_voltages;
2560 if (!rdev->is_switch || !rdev->supply)
2563 return regulator_count_voltages(rdev->supply);
2565 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2568 * regulator_list_voltage - enumerate supported voltages
2569 * @regulator: regulator source
2570 * @selector: identify voltage to list
2571 * Context: can sleep
2573 * Returns a voltage that can be passed to @regulator_set_voltage(),
2574 * zero if this selector code can't be used on this system, or a
2577 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2579 return _regulator_list_voltage(regulator, selector, 1);
2581 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2584 * regulator_get_regmap - get the regulator's register map
2585 * @regulator: regulator source
2587 * Returns the register map for the given regulator, or an ERR_PTR value
2588 * if the regulator doesn't use regmap.
2590 struct regmap *regulator_get_regmap(struct regulator *regulator)
2592 struct regmap *map = regulator->rdev->regmap;
2594 return map ? map : ERR_PTR(-EOPNOTSUPP);
2598 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2599 * @regulator: regulator source
2600 * @vsel_reg: voltage selector register, output parameter
2601 * @vsel_mask: mask for voltage selector bitfield, output parameter
2603 * Returns the hardware register offset and bitmask used for setting the
2604 * regulator voltage. This might be useful when configuring voltage-scaling
2605 * hardware or firmware that can make I2C requests behind the kernel's back,
2608 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2609 * and 0 is returned, otherwise a negative errno is returned.
2611 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2613 unsigned *vsel_mask)
2615 struct regulator_dev *rdev = regulator->rdev;
2616 const struct regulator_ops *ops = rdev->desc->ops;
2618 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2621 *vsel_reg = rdev->desc->vsel_reg;
2622 *vsel_mask = rdev->desc->vsel_mask;
2626 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2629 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2630 * @regulator: regulator source
2631 * @selector: identify voltage to list
2633 * Converts the selector to a hardware-specific voltage selector that can be
2634 * directly written to the regulator registers. The address of the voltage
2635 * register can be determined by calling @regulator_get_hardware_vsel_register.
2637 * On error a negative errno is returned.
2639 int regulator_list_hardware_vsel(struct regulator *regulator,
2642 struct regulator_dev *rdev = regulator->rdev;
2643 const struct regulator_ops *ops = rdev->desc->ops;
2645 if (selector >= rdev->desc->n_voltages)
2647 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2652 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2655 * regulator_get_linear_step - return the voltage step size between VSEL values
2656 * @regulator: regulator source
2658 * Returns the voltage step size between VSEL values for linear
2659 * regulators, or return 0 if the regulator isn't a linear regulator.
2661 unsigned int regulator_get_linear_step(struct regulator *regulator)
2663 struct regulator_dev *rdev = regulator->rdev;
2665 return rdev->desc->uV_step;
2667 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2670 * regulator_is_supported_voltage - check if a voltage range can be supported
2672 * @regulator: Regulator to check.
2673 * @min_uV: Minimum required voltage in uV.
2674 * @max_uV: Maximum required voltage in uV.
2676 * Returns a boolean or a negative error code.
2678 int regulator_is_supported_voltage(struct regulator *regulator,
2679 int min_uV, int max_uV)
2681 struct regulator_dev *rdev = regulator->rdev;
2682 int i, voltages, ret;
2684 /* If we can't change voltage check the current voltage */
2685 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2686 ret = regulator_get_voltage(regulator);
2688 return min_uV <= ret && ret <= max_uV;
2693 /* Any voltage within constrains range is fine? */
2694 if (rdev->desc->continuous_voltage_range)
2695 return min_uV >= rdev->constraints->min_uV &&
2696 max_uV <= rdev->constraints->max_uV;
2698 ret = regulator_count_voltages(regulator);
2703 for (i = 0; i < voltages; i++) {
2704 ret = regulator_list_voltage(regulator, i);
2706 if (ret >= min_uV && ret <= max_uV)
2712 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2714 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2717 const struct regulator_desc *desc = rdev->desc;
2719 if (desc->ops->map_voltage)
2720 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2722 if (desc->ops->list_voltage == regulator_list_voltage_linear)
2723 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2725 if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2726 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2728 return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2731 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2732 int min_uV, int max_uV,
2735 struct pre_voltage_change_data data;
2738 data.old_uV = _regulator_get_voltage(rdev);
2739 data.min_uV = min_uV;
2740 data.max_uV = max_uV;
2741 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2743 if (ret & NOTIFY_STOP_MASK)
2746 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2750 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2751 (void *)data.old_uV);
2756 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2757 int uV, unsigned selector)
2759 struct pre_voltage_change_data data;
2762 data.old_uV = _regulator_get_voltage(rdev);
2765 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2767 if (ret & NOTIFY_STOP_MASK)
2770 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2774 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2775 (void *)data.old_uV);
2780 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2781 int old_uV, int new_uV)
2783 unsigned int ramp_delay = 0;
2785 if (rdev->constraints->ramp_delay)
2786 ramp_delay = rdev->constraints->ramp_delay;
2787 else if (rdev->desc->ramp_delay)
2788 ramp_delay = rdev->desc->ramp_delay;
2789 else if (rdev->constraints->settling_time)
2790 return rdev->constraints->settling_time;
2791 else if (rdev->constraints->settling_time_up &&
2793 return rdev->constraints->settling_time_up;
2794 else if (rdev->constraints->settling_time_down &&
2796 return rdev->constraints->settling_time_down;
2798 if (ramp_delay == 0) {
2799 rdev_dbg(rdev, "ramp_delay not set\n");
2803 return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2806 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2807 int min_uV, int max_uV)
2812 unsigned int selector;
2813 int old_selector = -1;
2814 const struct regulator_ops *ops = rdev->desc->ops;
2815 int old_uV = _regulator_get_voltage(rdev);
2817 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2819 min_uV += rdev->constraints->uV_offset;
2820 max_uV += rdev->constraints->uV_offset;
2823 * If we can't obtain the old selector there is not enough
2824 * info to call set_voltage_time_sel().
2826 if (_regulator_is_enabled(rdev) &&
2827 ops->set_voltage_time_sel && ops->get_voltage_sel) {
2828 old_selector = ops->get_voltage_sel(rdev);
2829 if (old_selector < 0)
2830 return old_selector;
2833 if (ops->set_voltage) {
2834 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2838 if (ops->list_voltage)
2839 best_val = ops->list_voltage(rdev,
2842 best_val = _regulator_get_voltage(rdev);
2845 } else if (ops->set_voltage_sel) {
2846 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2848 best_val = ops->list_voltage(rdev, ret);
2849 if (min_uV <= best_val && max_uV >= best_val) {
2851 if (old_selector == selector)
2854 ret = _regulator_call_set_voltage_sel(
2855 rdev, best_val, selector);
2867 if (ops->set_voltage_time_sel) {
2869 * Call set_voltage_time_sel if successfully obtained
2872 if (old_selector >= 0 && old_selector != selector)
2873 delay = ops->set_voltage_time_sel(rdev, old_selector,
2876 if (old_uV != best_val) {
2877 if (ops->set_voltage_time)
2878 delay = ops->set_voltage_time(rdev, old_uV,
2881 delay = _regulator_set_voltage_time(rdev,
2888 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2892 /* Insert any necessary delays */
2893 if (delay >= 1000) {
2894 mdelay(delay / 1000);
2895 udelay(delay % 1000);
2900 if (best_val >= 0) {
2901 unsigned long data = best_val;
2903 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2908 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2913 static int regulator_set_voltage_unlocked(struct regulator *regulator,
2914 int min_uV, int max_uV)
2916 struct regulator_dev *rdev = regulator->rdev;
2918 int old_min_uV, old_max_uV;
2920 int best_supply_uV = 0;
2921 int supply_change_uV = 0;
2923 /* If we're setting the same range as last time the change
2924 * should be a noop (some cpufreq implementations use the same
2925 * voltage for multiple frequencies, for example).
2927 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2930 /* If we're trying to set a range that overlaps the current voltage,
2931 * return successfully even though the regulator does not support
2932 * changing the voltage.
2934 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2935 current_uV = _regulator_get_voltage(rdev);
2936 if (min_uV <= current_uV && current_uV <= max_uV) {
2937 regulator->min_uV = min_uV;
2938 regulator->max_uV = max_uV;
2944 if (!rdev->desc->ops->set_voltage &&
2945 !rdev->desc->ops->set_voltage_sel) {
2950 /* constraints check */
2951 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2955 /* restore original values in case of error */
2956 old_min_uV = regulator->min_uV;
2957 old_max_uV = regulator->max_uV;
2958 regulator->min_uV = min_uV;
2959 regulator->max_uV = max_uV;
2961 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2966 regulator_ops_is_valid(rdev->supply->rdev,
2967 REGULATOR_CHANGE_VOLTAGE) &&
2968 (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
2969 rdev->desc->ops->get_voltage_sel))) {
2970 int current_supply_uV;
2973 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2979 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2980 if (best_supply_uV < 0) {
2981 ret = best_supply_uV;
2985 best_supply_uV += rdev->desc->min_dropout_uV;
2987 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2988 if (current_supply_uV < 0) {
2989 ret = current_supply_uV;
2993 supply_change_uV = best_supply_uV - current_supply_uV;
2996 if (supply_change_uV > 0) {
2997 ret = regulator_set_voltage_unlocked(rdev->supply,
2998 best_supply_uV, INT_MAX);
3000 dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
3006 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3010 if (supply_change_uV < 0) {
3011 ret = regulator_set_voltage_unlocked(rdev->supply,
3012 best_supply_uV, INT_MAX);
3014 dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
3016 /* No need to fail here */
3023 regulator->min_uV = old_min_uV;
3024 regulator->max_uV = old_max_uV;
3030 * regulator_set_voltage - set regulator output voltage
3031 * @regulator: regulator source
3032 * @min_uV: Minimum required voltage in uV
3033 * @max_uV: Maximum acceptable voltage in uV
3035 * Sets a voltage regulator to the desired output voltage. This can be set
3036 * during any regulator state. IOW, regulator can be disabled or enabled.
3038 * If the regulator is enabled then the voltage will change to the new value
3039 * immediately otherwise if the regulator is disabled the regulator will
3040 * output at the new voltage when enabled.
3042 * NOTE: If the regulator is shared between several devices then the lowest
3043 * request voltage that meets the system constraints will be used.
3044 * Regulator system constraints must be set for this regulator before
3045 * calling this function otherwise this call will fail.
3047 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3051 regulator_lock_supply(regulator->rdev);
3053 ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
3055 regulator_unlock_supply(regulator->rdev);
3059 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3062 * regulator_set_voltage_time - get raise/fall time
3063 * @regulator: regulator source
3064 * @old_uV: starting voltage in microvolts
3065 * @new_uV: target voltage in microvolts
3067 * Provided with the starting and ending voltage, this function attempts to
3068 * calculate the time in microseconds required to rise or fall to this new
3071 int regulator_set_voltage_time(struct regulator *regulator,
3072 int old_uV, int new_uV)
3074 struct regulator_dev *rdev = regulator->rdev;
3075 const struct regulator_ops *ops = rdev->desc->ops;
3081 if (ops->set_voltage_time)
3082 return ops->set_voltage_time(rdev, old_uV, new_uV);
3083 else if (!ops->set_voltage_time_sel)
3084 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3086 /* Currently requires operations to do this */
3087 if (!ops->list_voltage || !rdev->desc->n_voltages)
3090 for (i = 0; i < rdev->desc->n_voltages; i++) {
3091 /* We only look for exact voltage matches here */
3092 voltage = regulator_list_voltage(regulator, i);
3097 if (voltage == old_uV)
3099 if (voltage == new_uV)
3103 if (old_sel < 0 || new_sel < 0)
3106 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3108 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3111 * regulator_set_voltage_time_sel - get raise/fall time
3112 * @rdev: regulator source device
3113 * @old_selector: selector for starting voltage
3114 * @new_selector: selector for target voltage
3116 * Provided with the starting and target voltage selectors, this function
3117 * returns time in microseconds required to rise or fall to this new voltage
3119 * Drivers providing ramp_delay in regulation_constraints can use this as their
3120 * set_voltage_time_sel() operation.
3122 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3123 unsigned int old_selector,
3124 unsigned int new_selector)
3126 int old_volt, new_volt;
3129 if (!rdev->desc->ops->list_voltage)
3132 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3133 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3135 if (rdev->desc->ops->set_voltage_time)
3136 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3139 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3141 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3144 * regulator_sync_voltage - re-apply last regulator output voltage
3145 * @regulator: regulator source
3147 * Re-apply the last configured voltage. This is intended to be used
3148 * where some external control source the consumer is cooperating with
3149 * has caused the configured voltage to change.
3151 int regulator_sync_voltage(struct regulator *regulator)
3153 struct regulator_dev *rdev = regulator->rdev;
3154 int ret, min_uV, max_uV;
3156 mutex_lock(&rdev->mutex);
3158 if (!rdev->desc->ops->set_voltage &&
3159 !rdev->desc->ops->set_voltage_sel) {
3164 /* This is only going to work if we've had a voltage configured. */
3165 if (!regulator->min_uV && !regulator->max_uV) {
3170 min_uV = regulator->min_uV;
3171 max_uV = regulator->max_uV;
3173 /* This should be a paranoia check... */
3174 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3178 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3182 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3185 mutex_unlock(&rdev->mutex);
3188 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3190 static int _regulator_get_voltage(struct regulator_dev *rdev)
3195 if (rdev->desc->ops->get_bypass) {
3196 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3200 /* if bypassed the regulator must have a supply */
3201 if (!rdev->supply) {
3203 "bypassed regulator has no supply!\n");
3204 return -EPROBE_DEFER;
3207 return _regulator_get_voltage(rdev->supply->rdev);
3211 if (rdev->desc->ops->get_voltage_sel) {
3212 sel = rdev->desc->ops->get_voltage_sel(rdev);
3215 ret = rdev->desc->ops->list_voltage(rdev, sel);
3216 } else if (rdev->desc->ops->get_voltage) {
3217 ret = rdev->desc->ops->get_voltage(rdev);
3218 } else if (rdev->desc->ops->list_voltage) {
3219 ret = rdev->desc->ops->list_voltage(rdev, 0);
3220 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3221 ret = rdev->desc->fixed_uV;
3222 } else if (rdev->supply) {
3223 ret = _regulator_get_voltage(rdev->supply->rdev);
3224 } else if (rdev->supply_name) {
3225 return -EPROBE_DEFER;
3232 return ret - rdev->constraints->uV_offset;
3236 * regulator_get_voltage - get regulator output voltage
3237 * @regulator: regulator source
3239 * This returns the current regulator voltage in uV.
3241 * NOTE: If the regulator is disabled it will return the voltage value. This
3242 * function should not be used to determine regulator state.
3244 int regulator_get_voltage(struct regulator *regulator)
3248 regulator_lock_supply(regulator->rdev);
3250 ret = _regulator_get_voltage(regulator->rdev);
3252 regulator_unlock_supply(regulator->rdev);
3256 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3259 * regulator_set_current_limit - set regulator output current limit
3260 * @regulator: regulator source
3261 * @min_uA: Minimum supported current in uA
3262 * @max_uA: Maximum supported current in uA
3264 * Sets current sink to the desired output current. This can be set during
3265 * any regulator state. IOW, regulator can be disabled or enabled.
3267 * If the regulator is enabled then the current will change to the new value
3268 * immediately otherwise if the regulator is disabled the regulator will
3269 * output at the new current when enabled.
3271 * NOTE: Regulator system constraints must be set for this regulator before
3272 * calling this function otherwise this call will fail.
3274 int regulator_set_current_limit(struct regulator *regulator,
3275 int min_uA, int max_uA)
3277 struct regulator_dev *rdev = regulator->rdev;
3280 mutex_lock(&rdev->mutex);
3283 if (!rdev->desc->ops->set_current_limit) {
3288 /* constraints check */
3289 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3293 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3295 mutex_unlock(&rdev->mutex);
3298 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3300 static int _regulator_get_current_limit(struct regulator_dev *rdev)
3304 mutex_lock(&rdev->mutex);
3307 if (!rdev->desc->ops->get_current_limit) {
3312 ret = rdev->desc->ops->get_current_limit(rdev);
3314 mutex_unlock(&rdev->mutex);
3319 * regulator_get_current_limit - get regulator output current
3320 * @regulator: regulator source
3322 * This returns the current supplied by the specified current sink in uA.
3324 * NOTE: If the regulator is disabled it will return the current value. This
3325 * function should not be used to determine regulator state.
3327 int regulator_get_current_limit(struct regulator *regulator)
3329 return _regulator_get_current_limit(regulator->rdev);
3331 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3334 * regulator_set_mode - set regulator operating mode
3335 * @regulator: regulator source
3336 * @mode: operating mode - one of the REGULATOR_MODE constants
3338 * Set regulator operating mode to increase regulator efficiency or improve
3339 * regulation performance.
3341 * NOTE: Regulator system constraints must be set for this regulator before
3342 * calling this function otherwise this call will fail.
3344 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3346 struct regulator_dev *rdev = regulator->rdev;
3348 int regulator_curr_mode;
3350 mutex_lock(&rdev->mutex);
3353 if (!rdev->desc->ops->set_mode) {
3358 /* return if the same mode is requested */
3359 if (rdev->desc->ops->get_mode) {
3360 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3361 if (regulator_curr_mode == mode) {
3367 /* constraints check */
3368 ret = regulator_mode_constrain(rdev, &mode);
3372 ret = rdev->desc->ops->set_mode(rdev, mode);
3374 mutex_unlock(&rdev->mutex);
3377 EXPORT_SYMBOL_GPL(regulator_set_mode);
3379 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3383 mutex_lock(&rdev->mutex);
3386 if (!rdev->desc->ops->get_mode) {
3391 ret = rdev->desc->ops->get_mode(rdev);
3393 mutex_unlock(&rdev->mutex);
3398 * regulator_get_mode - get regulator operating mode
3399 * @regulator: regulator source
3401 * Get the current regulator operating mode.
3403 unsigned int regulator_get_mode(struct regulator *regulator)
3405 return _regulator_get_mode(regulator->rdev);
3407 EXPORT_SYMBOL_GPL(regulator_get_mode);
3409 static int _regulator_get_error_flags(struct regulator_dev *rdev,
3410 unsigned int *flags)
3414 mutex_lock(&rdev->mutex);
3417 if (!rdev->desc->ops->get_error_flags) {
3422 ret = rdev->desc->ops->get_error_flags(rdev, flags);
3424 mutex_unlock(&rdev->mutex);
3429 * regulator_get_error_flags - get regulator error information
3430 * @regulator: regulator source
3431 * @flags: pointer to store error flags
3433 * Get the current regulator error information.
3435 int regulator_get_error_flags(struct regulator *regulator,
3436 unsigned int *flags)
3438 return _regulator_get_error_flags(regulator->rdev, flags);
3440 EXPORT_SYMBOL_GPL(regulator_get_error_flags);
3443 * regulator_set_load - set regulator load
3444 * @regulator: regulator source
3445 * @uA_load: load current
3447 * Notifies the regulator core of a new device load. This is then used by
3448 * DRMS (if enabled by constraints) to set the most efficient regulator
3449 * operating mode for the new regulator loading.
3451 * Consumer devices notify their supply regulator of the maximum power
3452 * they will require (can be taken from device datasheet in the power
3453 * consumption tables) when they change operational status and hence power
3454 * state. Examples of operational state changes that can affect power
3455 * consumption are :-
3457 * o Device is opened / closed.
3458 * o Device I/O is about to begin or has just finished.
3459 * o Device is idling in between work.
3461 * This information is also exported via sysfs to userspace.
3463 * DRMS will sum the total requested load on the regulator and change
3464 * to the most efficient operating mode if platform constraints allow.
3466 * On error a negative errno is returned.
3468 int regulator_set_load(struct regulator *regulator, int uA_load)
3470 struct regulator_dev *rdev = regulator->rdev;
3473 mutex_lock(&rdev->mutex);
3474 regulator->uA_load = uA_load;
3475 ret = drms_uA_update(rdev);
3476 mutex_unlock(&rdev->mutex);
3480 EXPORT_SYMBOL_GPL(regulator_set_load);
3483 * regulator_allow_bypass - allow the regulator to go into bypass mode
3485 * @regulator: Regulator to configure
3486 * @enable: enable or disable bypass mode
3488 * Allow the regulator to go into bypass mode if all other consumers
3489 * for the regulator also enable bypass mode and the machine
3490 * constraints allow this. Bypass mode means that the regulator is
3491 * simply passing the input directly to the output with no regulation.
3493 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3495 struct regulator_dev *rdev = regulator->rdev;
3498 if (!rdev->desc->ops->set_bypass)
3501 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3504 mutex_lock(&rdev->mutex);
3506 if (enable && !regulator->bypass) {
3507 rdev->bypass_count++;
3509 if (rdev->bypass_count == rdev->open_count) {
3510 ret = rdev->desc->ops->set_bypass(rdev, enable);
3512 rdev->bypass_count--;
3515 } else if (!enable && regulator->bypass) {
3516 rdev->bypass_count--;
3518 if (rdev->bypass_count != rdev->open_count) {
3519 ret = rdev->desc->ops->set_bypass(rdev, enable);
3521 rdev->bypass_count++;
3526 regulator->bypass = enable;
3528 mutex_unlock(&rdev->mutex);
3532 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3535 * regulator_register_notifier - register regulator event notifier
3536 * @regulator: regulator source
3537 * @nb: notifier block
3539 * Register notifier block to receive regulator events.
3541 int regulator_register_notifier(struct regulator *regulator,
3542 struct notifier_block *nb)
3544 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3547 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3550 * regulator_unregister_notifier - unregister regulator event notifier
3551 * @regulator: regulator source
3552 * @nb: notifier block
3554 * Unregister regulator event notifier block.
3556 int regulator_unregister_notifier(struct regulator *regulator,
3557 struct notifier_block *nb)
3559 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3562 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3564 /* notify regulator consumers and downstream regulator consumers.
3565 * Note mutex must be held by caller.
3567 static int _notifier_call_chain(struct regulator_dev *rdev,
3568 unsigned long event, void *data)
3570 /* call rdev chain first */
3571 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3575 * regulator_bulk_get - get multiple regulator consumers
3577 * @dev: Device to supply
3578 * @num_consumers: Number of consumers to register
3579 * @consumers: Configuration of consumers; clients are stored here.
3581 * @return 0 on success, an errno on failure.
3583 * This helper function allows drivers to get several regulator
3584 * consumers in one operation. If any of the regulators cannot be
3585 * acquired then any regulators that were allocated will be freed
3586 * before returning to the caller.
3588 int regulator_bulk_get(struct device *dev, int num_consumers,
3589 struct regulator_bulk_data *consumers)
3594 for (i = 0; i < num_consumers; i++)
3595 consumers[i].consumer = NULL;
3597 for (i = 0; i < num_consumers; i++) {
3598 consumers[i].consumer = regulator_get(dev,
3599 consumers[i].supply);
3600 if (IS_ERR(consumers[i].consumer)) {
3601 ret = PTR_ERR(consumers[i].consumer);
3602 dev_err(dev, "Failed to get supply '%s': %d\n",
3603 consumers[i].supply, ret);
3604 consumers[i].consumer = NULL;
3613 regulator_put(consumers[i].consumer);
3617 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3619 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3621 struct regulator_bulk_data *bulk = data;
3623 bulk->ret = regulator_enable(bulk->consumer);
3627 * regulator_bulk_enable - enable multiple regulator consumers
3629 * @num_consumers: Number of consumers
3630 * @consumers: Consumer data; clients are stored here.
3631 * @return 0 on success, an errno on failure
3633 * This convenience API allows consumers to enable multiple regulator
3634 * clients in a single API call. If any consumers cannot be enabled
3635 * then any others that were enabled will be disabled again prior to
3638 int regulator_bulk_enable(int num_consumers,
3639 struct regulator_bulk_data *consumers)
3641 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3645 for (i = 0; i < num_consumers; i++) {
3646 if (consumers[i].consumer->always_on)
3647 consumers[i].ret = 0;
3649 async_schedule_domain(regulator_bulk_enable_async,
3650 &consumers[i], &async_domain);
3653 async_synchronize_full_domain(&async_domain);
3655 /* If any consumer failed we need to unwind any that succeeded */
3656 for (i = 0; i < num_consumers; i++) {
3657 if (consumers[i].ret != 0) {
3658 ret = consumers[i].ret;
3666 for (i = 0; i < num_consumers; i++) {
3667 if (consumers[i].ret < 0)
3668 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3671 regulator_disable(consumers[i].consumer);
3676 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3679 * regulator_bulk_disable - disable multiple regulator consumers
3681 * @num_consumers: Number of consumers
3682 * @consumers: Consumer data; clients are stored here.
3683 * @return 0 on success, an errno on failure
3685 * This convenience API allows consumers to disable multiple regulator
3686 * clients in a single API call. If any consumers cannot be disabled
3687 * then any others that were disabled will be enabled again prior to
3690 int regulator_bulk_disable(int num_consumers,
3691 struct regulator_bulk_data *consumers)
3696 for (i = num_consumers - 1; i >= 0; --i) {
3697 ret = regulator_disable(consumers[i].consumer);
3705 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3706 for (++i; i < num_consumers; ++i) {
3707 r = regulator_enable(consumers[i].consumer);
3709 pr_err("Failed to re-enable %s: %d\n",
3710 consumers[i].supply, r);
3715 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3718 * regulator_bulk_force_disable - force disable multiple regulator consumers
3720 * @num_consumers: Number of consumers
3721 * @consumers: Consumer data; clients are stored here.
3722 * @return 0 on success, an errno on failure
3724 * This convenience API allows consumers to forcibly disable multiple regulator
3725 * clients in a single API call.
3726 * NOTE: This should be used for situations when device damage will
3727 * likely occur if the regulators are not disabled (e.g. over temp).
3728 * Although regulator_force_disable function call for some consumers can
3729 * return error numbers, the function is called for all consumers.
3731 int regulator_bulk_force_disable(int num_consumers,
3732 struct regulator_bulk_data *consumers)
3737 for (i = 0; i < num_consumers; i++) {
3739 regulator_force_disable(consumers[i].consumer);
3741 /* Store first error for reporting */
3742 if (consumers[i].ret && !ret)
3743 ret = consumers[i].ret;
3748 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3751 * regulator_bulk_free - free multiple regulator consumers
3753 * @num_consumers: Number of consumers
3754 * @consumers: Consumer data; clients are stored here.
3756 * This convenience API allows consumers to free multiple regulator
3757 * clients in a single API call.
3759 void regulator_bulk_free(int num_consumers,
3760 struct regulator_bulk_data *consumers)
3764 for (i = 0; i < num_consumers; i++) {
3765 regulator_put(consumers[i].consumer);
3766 consumers[i].consumer = NULL;
3769 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3772 * regulator_notifier_call_chain - call regulator event notifier
3773 * @rdev: regulator source
3774 * @event: notifier block
3775 * @data: callback-specific data.
3777 * Called by regulator drivers to notify clients a regulator event has
3778 * occurred. We also notify regulator clients downstream.
3779 * Note lock must be held by caller.
3781 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3782 unsigned long event, void *data)
3784 lockdep_assert_held_once(&rdev->mutex);
3786 _notifier_call_chain(rdev, event, data);
3790 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3793 * regulator_mode_to_status - convert a regulator mode into a status
3795 * @mode: Mode to convert
3797 * Convert a regulator mode into a status.
3799 int regulator_mode_to_status(unsigned int mode)
3802 case REGULATOR_MODE_FAST:
3803 return REGULATOR_STATUS_FAST;
3804 case REGULATOR_MODE_NORMAL:
3805 return REGULATOR_STATUS_NORMAL;
3806 case REGULATOR_MODE_IDLE:
3807 return REGULATOR_STATUS_IDLE;
3808 case REGULATOR_MODE_STANDBY:
3809 return REGULATOR_STATUS_STANDBY;
3811 return REGULATOR_STATUS_UNDEFINED;
3814 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3816 static struct attribute *regulator_dev_attrs[] = {
3817 &dev_attr_name.attr,
3818 &dev_attr_num_users.attr,
3819 &dev_attr_type.attr,
3820 &dev_attr_microvolts.attr,
3821 &dev_attr_microamps.attr,
3822 &dev_attr_opmode.attr,
3823 &dev_attr_state.attr,
3824 &dev_attr_status.attr,
3825 &dev_attr_bypass.attr,
3826 &dev_attr_requested_microamps.attr,
3827 &dev_attr_min_microvolts.attr,
3828 &dev_attr_max_microvolts.attr,
3829 &dev_attr_min_microamps.attr,
3830 &dev_attr_max_microamps.attr,
3831 &dev_attr_suspend_standby_state.attr,
3832 &dev_attr_suspend_mem_state.attr,
3833 &dev_attr_suspend_disk_state.attr,
3834 &dev_attr_suspend_standby_microvolts.attr,
3835 &dev_attr_suspend_mem_microvolts.attr,
3836 &dev_attr_suspend_disk_microvolts.attr,
3837 &dev_attr_suspend_standby_mode.attr,
3838 &dev_attr_suspend_mem_mode.attr,
3839 &dev_attr_suspend_disk_mode.attr,
3844 * To avoid cluttering sysfs (and memory) with useless state, only
3845 * create attributes that can be meaningfully displayed.
3847 static umode_t regulator_attr_is_visible(struct kobject *kobj,
3848 struct attribute *attr, int idx)
3850 struct device *dev = kobj_to_dev(kobj);
3851 struct regulator_dev *rdev = dev_to_rdev(dev);
3852 const struct regulator_ops *ops = rdev->desc->ops;
3853 umode_t mode = attr->mode;
3855 /* these three are always present */
3856 if (attr == &dev_attr_name.attr ||
3857 attr == &dev_attr_num_users.attr ||
3858 attr == &dev_attr_type.attr)
3861 /* some attributes need specific methods to be displayed */
3862 if (attr == &dev_attr_microvolts.attr) {
3863 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3864 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3865 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3866 (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3871 if (attr == &dev_attr_microamps.attr)
3872 return ops->get_current_limit ? mode : 0;
3874 if (attr == &dev_attr_opmode.attr)
3875 return ops->get_mode ? mode : 0;
3877 if (attr == &dev_attr_state.attr)
3878 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3880 if (attr == &dev_attr_status.attr)
3881 return ops->get_status ? mode : 0;
3883 if (attr == &dev_attr_bypass.attr)
3884 return ops->get_bypass ? mode : 0;
3886 /* some attributes are type-specific */
3887 if (attr == &dev_attr_requested_microamps.attr)
3888 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3890 /* constraints need specific supporting methods */
3891 if (attr == &dev_attr_min_microvolts.attr ||
3892 attr == &dev_attr_max_microvolts.attr)
3893 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3895 if (attr == &dev_attr_min_microamps.attr ||
3896 attr == &dev_attr_max_microamps.attr)
3897 return ops->set_current_limit ? mode : 0;
3899 if (attr == &dev_attr_suspend_standby_state.attr ||
3900 attr == &dev_attr_suspend_mem_state.attr ||
3901 attr == &dev_attr_suspend_disk_state.attr)
3904 if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3905 attr == &dev_attr_suspend_mem_microvolts.attr ||
3906 attr == &dev_attr_suspend_disk_microvolts.attr)
3907 return ops->set_suspend_voltage ? mode : 0;
3909 if (attr == &dev_attr_suspend_standby_mode.attr ||
3910 attr == &dev_attr_suspend_mem_mode.attr ||
3911 attr == &dev_attr_suspend_disk_mode.attr)
3912 return ops->set_suspend_mode ? mode : 0;
3917 static const struct attribute_group regulator_dev_group = {
3918 .attrs = regulator_dev_attrs,
3919 .is_visible = regulator_attr_is_visible,
3922 static const struct attribute_group *regulator_dev_groups[] = {
3923 ®ulator_dev_group,
3927 static void regulator_dev_release(struct device *dev)
3929 struct regulator_dev *rdev = dev_get_drvdata(dev);
3931 kfree(rdev->constraints);
3932 of_node_put(rdev->dev.of_node);
3936 static struct class regulator_class = {
3937 .name = "regulator",
3938 .dev_release = regulator_dev_release,
3939 .dev_groups = regulator_dev_groups,
3942 static void rdev_init_debugfs(struct regulator_dev *rdev)
3944 struct device *parent = rdev->dev.parent;
3945 const char *rname = rdev_get_name(rdev);
3946 char name[NAME_MAX];
3948 /* Avoid duplicate debugfs directory names */
3949 if (parent && rname == rdev->desc->name) {
3950 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3955 rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3956 if (!rdev->debugfs) {
3957 rdev_warn(rdev, "Failed to create debugfs directory\n");
3961 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3963 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3965 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3966 &rdev->bypass_count);
3969 static int regulator_register_resolve_supply(struct device *dev, void *data)
3971 struct regulator_dev *rdev = dev_to_rdev(dev);
3973 if (regulator_resolve_supply(rdev))
3974 rdev_dbg(rdev, "unable to resolve supply\n");
3980 * regulator_register - register regulator
3981 * @regulator_desc: regulator to register
3982 * @cfg: runtime configuration for regulator
3984 * Called by regulator drivers to register a regulator.
3985 * Returns a valid pointer to struct regulator_dev on success
3986 * or an ERR_PTR() on error.
3988 struct regulator_dev *
3989 regulator_register(const struct regulator_desc *regulator_desc,
3990 const struct regulator_config *cfg)
3992 const struct regulator_init_data *init_data;
3993 struct regulator_config *config = NULL;
3994 static atomic_t regulator_no = ATOMIC_INIT(-1);
3995 struct regulator_dev *rdev;
3999 if (regulator_desc == NULL || cfg == NULL)
4000 return ERR_PTR(-EINVAL);
4005 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
4006 return ERR_PTR(-EINVAL);
4008 if (regulator_desc->type != REGULATOR_VOLTAGE &&
4009 regulator_desc->type != REGULATOR_CURRENT)
4010 return ERR_PTR(-EINVAL);
4012 /* Only one of each should be implemented */
4013 WARN_ON(regulator_desc->ops->get_voltage &&
4014 regulator_desc->ops->get_voltage_sel);
4015 WARN_ON(regulator_desc->ops->set_voltage &&
4016 regulator_desc->ops->set_voltage_sel);
4018 /* If we're using selectors we must implement list_voltage. */
4019 if (regulator_desc->ops->get_voltage_sel &&
4020 !regulator_desc->ops->list_voltage) {
4021 return ERR_PTR(-EINVAL);
4023 if (regulator_desc->ops->set_voltage_sel &&
4024 !regulator_desc->ops->list_voltage) {
4025 return ERR_PTR(-EINVAL);
4028 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4030 return ERR_PTR(-ENOMEM);
4033 * Duplicate the config so the driver could override it after
4034 * parsing init data.
4036 config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4037 if (config == NULL) {
4039 return ERR_PTR(-ENOMEM);
4042 init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4043 &rdev->dev.of_node);
4045 init_data = config->init_data;
4046 rdev->dev.of_node = of_node_get(config->of_node);
4049 mutex_init(&rdev->mutex);
4050 rdev->reg_data = config->driver_data;
4051 rdev->owner = regulator_desc->owner;
4052 rdev->desc = regulator_desc;
4054 rdev->regmap = config->regmap;
4055 else if (dev_get_regmap(dev, NULL))
4056 rdev->regmap = dev_get_regmap(dev, NULL);
4057 else if (dev->parent)
4058 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4059 INIT_LIST_HEAD(&rdev->consumer_list);
4060 INIT_LIST_HEAD(&rdev->list);
4061 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4062 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4064 /* preform any regulator specific init */
4065 if (init_data && init_data->regulator_init) {
4066 ret = init_data->regulator_init(rdev->reg_data);
4071 if ((config->ena_gpio || config->ena_gpio_initialized) &&
4072 gpio_is_valid(config->ena_gpio)) {
4073 mutex_lock(®ulator_list_mutex);
4074 ret = regulator_ena_gpio_request(rdev, config);
4075 mutex_unlock(®ulator_list_mutex);
4077 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4078 config->ena_gpio, ret);
4083 /* register with sysfs */
4084 rdev->dev.class = ®ulator_class;
4085 rdev->dev.parent = dev;
4086 dev_set_name(&rdev->dev, "regulator.%lu",
4087 (unsigned long) atomic_inc_return(®ulator_no));
4089 /* set regulator constraints */
4091 rdev->constraints = kmemdup(&init_data->constraints,
4092 sizeof(*rdev->constraints),
4095 rdev->constraints = kzalloc(sizeof(*rdev->constraints),
4097 if (!rdev->constraints) {
4102 if (init_data && init_data->supply_regulator)
4103 rdev->supply_name = init_data->supply_regulator;
4104 else if (regulator_desc->supply_name)
4105 rdev->supply_name = regulator_desc->supply_name;
4107 ret = set_machine_constraints(rdev);
4108 if (ret == -EPROBE_DEFER) {
4109 /* Regulator might be in bypass mode and so needs its supply
4110 * to set the constraints */
4111 /* FIXME: this currently triggers a chicken-and-egg problem
4112 * when creating -SUPPLY symlink in sysfs to a regulator
4113 * that is just being created */
4114 ret = regulator_resolve_supply(rdev);
4116 ret = set_machine_constraints(rdev);
4118 rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
4124 /* add consumers devices */
4126 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4127 ret = set_consumer_device_supply(rdev,
4128 init_data->consumer_supplies[i].dev_name,
4129 init_data->consumer_supplies[i].supply);
4131 dev_err(dev, "Failed to set supply %s\n",
4132 init_data->consumer_supplies[i].supply);
4133 goto unset_supplies;
4138 if (!rdev->desc->ops->get_voltage &&
4139 !rdev->desc->ops->list_voltage &&
4140 !rdev->desc->fixed_uV)
4141 rdev->is_switch = true;
4143 dev_set_drvdata(&rdev->dev, rdev);
4144 ret = device_register(&rdev->dev);
4146 put_device(&rdev->dev);
4147 goto unset_supplies;
4150 rdev_init_debugfs(rdev);
4152 /* try to resolve regulators supply since a new one was registered */
4153 class_for_each_device(®ulator_class, NULL, NULL,
4154 regulator_register_resolve_supply);
4159 mutex_lock(®ulator_list_mutex);
4160 unset_regulator_supplies(rdev);
4161 mutex_unlock(®ulator_list_mutex);
4163 kfree(rdev->constraints);
4164 mutex_lock(®ulator_list_mutex);
4165 regulator_ena_gpio_free(rdev);
4166 mutex_unlock(®ulator_list_mutex);
4170 return ERR_PTR(ret);
4172 EXPORT_SYMBOL_GPL(regulator_register);
4175 * regulator_unregister - unregister regulator
4176 * @rdev: regulator to unregister
4178 * Called by regulator drivers to unregister a regulator.
4180 void regulator_unregister(struct regulator_dev *rdev)
4186 while (rdev->use_count--)
4187 regulator_disable(rdev->supply);
4188 regulator_put(rdev->supply);
4190 mutex_lock(®ulator_list_mutex);
4191 debugfs_remove_recursive(rdev->debugfs);
4192 flush_work(&rdev->disable_work.work);
4193 WARN_ON(rdev->open_count);
4194 unset_regulator_supplies(rdev);
4195 list_del(&rdev->list);
4196 regulator_ena_gpio_free(rdev);
4197 mutex_unlock(®ulator_list_mutex);
4198 device_unregister(&rdev->dev);
4200 EXPORT_SYMBOL_GPL(regulator_unregister);
4202 static int _regulator_suspend_prepare(struct device *dev, void *data)
4204 struct regulator_dev *rdev = dev_to_rdev(dev);
4205 const suspend_state_t *state = data;
4208 mutex_lock(&rdev->mutex);
4209 ret = suspend_prepare(rdev, *state);
4210 mutex_unlock(&rdev->mutex);
4216 * regulator_suspend_prepare - prepare regulators for system wide suspend
4217 * @state: system suspend state
4219 * Configure each regulator with it's suspend operating parameters for state.
4220 * This will usually be called by machine suspend code prior to supending.
4222 int regulator_suspend_prepare(suspend_state_t state)
4224 /* ON is handled by regulator active state */
4225 if (state == PM_SUSPEND_ON)
4228 return class_for_each_device(®ulator_class, NULL, &state,
4229 _regulator_suspend_prepare);
4231 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4233 static int _regulator_suspend_finish(struct device *dev, void *data)
4235 struct regulator_dev *rdev = dev_to_rdev(dev);
4238 mutex_lock(&rdev->mutex);
4239 if (rdev->use_count > 0 || rdev->constraints->always_on) {
4240 if (!_regulator_is_enabled(rdev)) {
4241 ret = _regulator_do_enable(rdev);
4244 "Failed to resume regulator %d\n",
4248 if (!have_full_constraints())
4250 if (!_regulator_is_enabled(rdev))
4253 ret = _regulator_do_disable(rdev);
4255 dev_err(dev, "Failed to suspend regulator %d\n", ret);
4258 mutex_unlock(&rdev->mutex);
4260 /* Keep processing regulators in spite of any errors */
4265 * regulator_suspend_finish - resume regulators from system wide suspend
4267 * Turn on regulators that might be turned off by regulator_suspend_prepare
4268 * and that should be turned on according to the regulators properties.
4270 int regulator_suspend_finish(void)
4272 return class_for_each_device(®ulator_class, NULL, NULL,
4273 _regulator_suspend_finish);
4275 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4278 * regulator_has_full_constraints - the system has fully specified constraints
4280 * Calling this function will cause the regulator API to disable all
4281 * regulators which have a zero use count and don't have an always_on
4282 * constraint in a late_initcall.
4284 * The intention is that this will become the default behaviour in a
4285 * future kernel release so users are encouraged to use this facility
4288 void regulator_has_full_constraints(void)
4290 has_full_constraints = 1;
4292 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4295 * rdev_get_drvdata - get rdev regulator driver data
4298 * Get rdev regulator driver private data. This call can be used in the
4299 * regulator driver context.
4301 void *rdev_get_drvdata(struct regulator_dev *rdev)
4303 return rdev->reg_data;
4305 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4308 * regulator_get_drvdata - get regulator driver data
4309 * @regulator: regulator
4311 * Get regulator driver private data. This call can be used in the consumer
4312 * driver context when non API regulator specific functions need to be called.
4314 void *regulator_get_drvdata(struct regulator *regulator)
4316 return regulator->rdev->reg_data;
4318 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4321 * regulator_set_drvdata - set regulator driver data
4322 * @regulator: regulator
4325 void regulator_set_drvdata(struct regulator *regulator, void *data)
4327 regulator->rdev->reg_data = data;
4329 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4332 * regulator_get_id - get regulator ID
4335 int rdev_get_id(struct regulator_dev *rdev)
4337 return rdev->desc->id;
4339 EXPORT_SYMBOL_GPL(rdev_get_id);
4341 struct device *rdev_get_dev(struct regulator_dev *rdev)
4345 EXPORT_SYMBOL_GPL(rdev_get_dev);
4347 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4349 return reg_init_data->driver_data;
4351 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4353 #ifdef CONFIG_DEBUG_FS
4354 static int supply_map_show(struct seq_file *sf, void *data)
4356 struct regulator_map *map;
4358 list_for_each_entry(map, ®ulator_map_list, list) {
4359 seq_printf(sf, "%s -> %s.%s\n",
4360 rdev_get_name(map->regulator), map->dev_name,
4367 static int supply_map_open(struct inode *inode, struct file *file)
4369 return single_open(file, supply_map_show, inode->i_private);
4373 static const struct file_operations supply_map_fops = {
4374 #ifdef CONFIG_DEBUG_FS
4375 .open = supply_map_open,
4377 .llseek = seq_lseek,
4378 .release = single_release,
4382 #ifdef CONFIG_DEBUG_FS
4383 struct summary_data {
4385 struct regulator_dev *parent;
4389 static void regulator_summary_show_subtree(struct seq_file *s,
4390 struct regulator_dev *rdev,
4393 static int regulator_summary_show_children(struct device *dev, void *data)
4395 struct regulator_dev *rdev = dev_to_rdev(dev);
4396 struct summary_data *summary_data = data;
4398 if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4399 regulator_summary_show_subtree(summary_data->s, rdev,
4400 summary_data->level + 1);
4405 static void regulator_summary_show_subtree(struct seq_file *s,
4406 struct regulator_dev *rdev,
4409 struct regulation_constraints *c;
4410 struct regulator *consumer;
4411 struct summary_data summary_data;
4416 seq_printf(s, "%*s%-*s %3d %4d %6d ",
4418 30 - level * 3, rdev_get_name(rdev),
4419 rdev->use_count, rdev->open_count, rdev->bypass_count);
4421 seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4422 seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4424 c = rdev->constraints;
4426 switch (rdev->desc->type) {
4427 case REGULATOR_VOLTAGE:
4428 seq_printf(s, "%5dmV %5dmV ",
4429 c->min_uV / 1000, c->max_uV / 1000);
4431 case REGULATOR_CURRENT:
4432 seq_printf(s, "%5dmA %5dmA ",
4433 c->min_uA / 1000, c->max_uA / 1000);
4440 list_for_each_entry(consumer, &rdev->consumer_list, list) {
4441 if (consumer->dev && consumer->dev->class == ®ulator_class)
4444 seq_printf(s, "%*s%-*s ",
4445 (level + 1) * 3 + 1, "",
4446 30 - (level + 1) * 3,
4447 consumer->dev ? dev_name(consumer->dev) : "deviceless");
4449 switch (rdev->desc->type) {
4450 case REGULATOR_VOLTAGE:
4451 seq_printf(s, "%37dmV %5dmV",
4452 consumer->min_uV / 1000,
4453 consumer->max_uV / 1000);
4455 case REGULATOR_CURRENT:
4463 summary_data.level = level;
4464 summary_data.parent = rdev;
4466 class_for_each_device(®ulator_class, NULL, &summary_data,
4467 regulator_summary_show_children);
4470 static int regulator_summary_show_roots(struct device *dev, void *data)
4472 struct regulator_dev *rdev = dev_to_rdev(dev);
4473 struct seq_file *s = data;
4476 regulator_summary_show_subtree(s, rdev, 0);
4481 static int regulator_summary_show(struct seq_file *s, void *data)
4483 seq_puts(s, " regulator use open bypass voltage current min max\n");
4484 seq_puts(s, "-------------------------------------------------------------------------------\n");
4486 class_for_each_device(®ulator_class, NULL, s,
4487 regulator_summary_show_roots);
4492 static int regulator_summary_open(struct inode *inode, struct file *file)
4494 return single_open(file, regulator_summary_show, inode->i_private);
4498 static const struct file_operations regulator_summary_fops = {
4499 #ifdef CONFIG_DEBUG_FS
4500 .open = regulator_summary_open,
4502 .llseek = seq_lseek,
4503 .release = single_release,
4507 static int __init regulator_init(void)
4511 ret = class_register(®ulator_class);
4513 debugfs_root = debugfs_create_dir("regulator", NULL);
4515 pr_warn("regulator: Failed to create debugfs directory\n");
4517 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4520 debugfs_create_file("regulator_summary", 0444, debugfs_root,
4521 NULL, ®ulator_summary_fops);
4523 regulator_dummy_init();
4528 /* init early to allow our consumers to complete system booting */
4529 core_initcall(regulator_init);
4531 static int __init regulator_late_cleanup(struct device *dev, void *data)
4533 struct regulator_dev *rdev = dev_to_rdev(dev);
4534 const struct regulator_ops *ops = rdev->desc->ops;
4535 struct regulation_constraints *c = rdev->constraints;
4538 if (c && c->always_on)
4541 if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4544 mutex_lock(&rdev->mutex);
4546 if (rdev->use_count)
4549 /* If we can't read the status assume it's on. */
4550 if (ops->is_enabled)
4551 enabled = ops->is_enabled(rdev);
4558 if (have_full_constraints()) {
4559 /* We log since this may kill the system if it goes
4561 rdev_info(rdev, "disabling\n");
4562 ret = _regulator_do_disable(rdev);
4564 rdev_err(rdev, "couldn't disable: %d\n", ret);
4566 /* The intention is that in future we will
4567 * assume that full constraints are provided
4568 * so warn even if we aren't going to do
4571 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4575 mutex_unlock(&rdev->mutex);
4580 static int __init regulator_init_complete(void)
4583 * Since DT doesn't provide an idiomatic mechanism for
4584 * enabling full constraints and since it's much more natural
4585 * with DT to provide them just assume that a DT enabled
4586 * system has full constraints.
4588 if (of_have_populated_dt())
4589 has_full_constraints = true;
4592 * Regulators may had failed to resolve their input supplies
4593 * when were registered, either because the input supply was
4594 * not registered yet or because its parent device was not
4595 * bound yet. So attempt to resolve the input supplies for
4596 * pending regulators before trying to disable unused ones.
4598 class_for_each_device(®ulator_class, NULL, NULL,
4599 regulator_register_resolve_supply);
4601 /* If we have a full configuration then disable any regulators
4602 * we have permission to change the status for and which are
4603 * not in use or always_on. This is effectively the default
4604 * for DT and ACPI as they have full constraints.
4606 class_for_each_device(®ulator_class, NULL, NULL,
4607 regulator_late_cleanup);
4611 late_initcall_sync(regulator_init_complete);