2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
28 #include <linux/regmap.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/module.h>
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/regulator.h>
41 #define rdev_crit(rdev, fmt, ...) \
42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
43 #define rdev_err(rdev, fmt, ...) \
44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
45 #define rdev_warn(rdev, fmt, ...) \
46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
47 #define rdev_info(rdev, fmt, ...) \
48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49 #define rdev_dbg(rdev, fmt, ...) \
50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
52 static DEFINE_MUTEX(regulator_list_mutex);
53 static LIST_HEAD(regulator_list);
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;
62 * struct regulator_map
64 * Used to provide symbolic supply names to devices.
66 struct regulator_map {
67 struct list_head list;
68 const char *dev_name; /* The dev_name() for the consumer */
70 struct regulator_dev *regulator;
74 * struct regulator_enable_gpio
76 * Management for shared enable GPIO pin
78 struct regulator_enable_gpio {
79 struct list_head list;
81 u32 enable_count; /* a number of enabled shared GPIO */
82 u32 request_count; /* a number of requested shared GPIO */
83 unsigned int ena_gpio_invert:1;
87 * struct regulator_supply_alias
89 * Used to map lookups for a supply onto an alternative device.
91 struct regulator_supply_alias {
92 struct list_head list;
93 struct device *src_dev;
94 const char *src_supply;
95 struct device *alias_dev;
96 const char *alias_supply;
99 static int _regulator_is_enabled(struct regulator_dev *rdev);
100 static int _regulator_disable(struct regulator_dev *rdev);
101 static int _regulator_get_voltage(struct regulator_dev *rdev);
102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
104 static void _notifier_call_chain(struct regulator_dev *rdev,
105 unsigned long event, void *data);
106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
107 int min_uV, int max_uV);
108 static struct regulator *create_regulator(struct regulator_dev *rdev,
110 const char *supply_name);
112 static const char *rdev_get_name(struct regulator_dev *rdev)
114 if (rdev->constraints && rdev->constraints->name)
115 return rdev->constraints->name;
116 else if (rdev->desc->name)
117 return rdev->desc->name;
122 static bool have_full_constraints(void)
124 return has_full_constraints || of_have_populated_dt();
128 * of_get_regulator - get a regulator device node based on supply name
129 * @dev: Device pointer for the consumer (of regulator) device
130 * @supply: regulator supply name
132 * Extract the regulator device node corresponding to the supply name.
133 * returns the device node corresponding to the regulator if found, else
136 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
138 struct device_node *regnode = NULL;
139 char prop_name[32]; /* 32 is max size of property name */
141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
143 snprintf(prop_name, 32, "%s-supply", supply);
144 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
147 dev_dbg(dev, "Looking up %s property in node %s failed",
148 prop_name, dev->of_node->full_name);
154 static int _regulator_can_change_status(struct regulator_dev *rdev)
156 if (!rdev->constraints)
159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
165 /* Platform voltage constraint check */
166 static int regulator_check_voltage(struct regulator_dev *rdev,
167 int *min_uV, int *max_uV)
169 BUG_ON(*min_uV > *max_uV);
171 if (!rdev->constraints) {
172 rdev_err(rdev, "no constraints\n");
175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
176 rdev_err(rdev, "operation not allowed\n");
180 if (*max_uV > rdev->constraints->max_uV)
181 *max_uV = rdev->constraints->max_uV;
182 if (*min_uV < rdev->constraints->min_uV)
183 *min_uV = rdev->constraints->min_uV;
185 if (*min_uV > *max_uV) {
186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
194 /* Make sure we select a voltage that suits the needs of all
195 * regulator consumers
197 static int regulator_check_consumers(struct regulator_dev *rdev,
198 int *min_uV, int *max_uV)
200 struct regulator *regulator;
202 list_for_each_entry(regulator, &rdev->consumer_list, list) {
204 * Assume consumers that didn't say anything are OK
205 * with anything in the constraint range.
207 if (!regulator->min_uV && !regulator->max_uV)
210 if (*max_uV > regulator->max_uV)
211 *max_uV = regulator->max_uV;
212 if (*min_uV < regulator->min_uV)
213 *min_uV = regulator->min_uV;
216 if (*min_uV > *max_uV) {
217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
225 /* current constraint check */
226 static int regulator_check_current_limit(struct regulator_dev *rdev,
227 int *min_uA, int *max_uA)
229 BUG_ON(*min_uA > *max_uA);
231 if (!rdev->constraints) {
232 rdev_err(rdev, "no constraints\n");
235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
236 rdev_err(rdev, "operation not allowed\n");
240 if (*max_uA > rdev->constraints->max_uA)
241 *max_uA = rdev->constraints->max_uA;
242 if (*min_uA < rdev->constraints->min_uA)
243 *min_uA = rdev->constraints->min_uA;
245 if (*min_uA > *max_uA) {
246 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
254 /* operating mode constraint check */
255 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
258 case REGULATOR_MODE_FAST:
259 case REGULATOR_MODE_NORMAL:
260 case REGULATOR_MODE_IDLE:
261 case REGULATOR_MODE_STANDBY:
264 rdev_err(rdev, "invalid mode %x specified\n", *mode);
268 if (!rdev->constraints) {
269 rdev_err(rdev, "no constraints\n");
272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
273 rdev_err(rdev, "operation not allowed\n");
277 /* The modes are bitmasks, the most power hungry modes having
278 * the lowest values. If the requested mode isn't supported
279 * try higher modes. */
281 if (rdev->constraints->valid_modes_mask & *mode)
289 /* dynamic regulator mode switching constraint check */
290 static int regulator_check_drms(struct regulator_dev *rdev)
292 if (!rdev->constraints) {
293 rdev_err(rdev, "no constraints\n");
296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
297 rdev_err(rdev, "operation not allowed\n");
303 static ssize_t regulator_uV_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
306 struct regulator_dev *rdev = dev_get_drvdata(dev);
309 mutex_lock(&rdev->mutex);
310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
311 mutex_unlock(&rdev->mutex);
315 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
317 static ssize_t regulator_uA_show(struct device *dev,
318 struct device_attribute *attr, char *buf)
320 struct regulator_dev *rdev = dev_get_drvdata(dev);
322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
324 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
326 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
329 struct regulator_dev *rdev = dev_get_drvdata(dev);
331 return sprintf(buf, "%s\n", rdev_get_name(rdev));
333 static DEVICE_ATTR_RO(name);
335 static ssize_t regulator_print_opmode(char *buf, int mode)
338 case REGULATOR_MODE_FAST:
339 return sprintf(buf, "fast\n");
340 case REGULATOR_MODE_NORMAL:
341 return sprintf(buf, "normal\n");
342 case REGULATOR_MODE_IDLE:
343 return sprintf(buf, "idle\n");
344 case REGULATOR_MODE_STANDBY:
345 return sprintf(buf, "standby\n");
347 return sprintf(buf, "unknown\n");
350 static ssize_t regulator_opmode_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
355 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
357 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
359 static ssize_t regulator_print_state(char *buf, int state)
362 return sprintf(buf, "enabled\n");
364 return sprintf(buf, "disabled\n");
366 return sprintf(buf, "unknown\n");
369 static ssize_t regulator_state_show(struct device *dev,
370 struct device_attribute *attr, char *buf)
372 struct regulator_dev *rdev = dev_get_drvdata(dev);
375 mutex_lock(&rdev->mutex);
376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
377 mutex_unlock(&rdev->mutex);
381 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
383 static ssize_t regulator_status_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
386 struct regulator_dev *rdev = dev_get_drvdata(dev);
390 status = rdev->desc->ops->get_status(rdev);
395 case REGULATOR_STATUS_OFF:
398 case REGULATOR_STATUS_ON:
401 case REGULATOR_STATUS_ERROR:
404 case REGULATOR_STATUS_FAST:
407 case REGULATOR_STATUS_NORMAL:
410 case REGULATOR_STATUS_IDLE:
413 case REGULATOR_STATUS_STANDBY:
416 case REGULATOR_STATUS_BYPASS:
419 case REGULATOR_STATUS_UNDEFINED:
426 return sprintf(buf, "%s\n", label);
428 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
430 static ssize_t regulator_min_uA_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
433 struct regulator_dev *rdev = dev_get_drvdata(dev);
435 if (!rdev->constraints)
436 return sprintf(buf, "constraint not defined\n");
438 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
440 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
442 static ssize_t regulator_max_uA_show(struct device *dev,
443 struct device_attribute *attr, char *buf)
445 struct regulator_dev *rdev = dev_get_drvdata(dev);
447 if (!rdev->constraints)
448 return sprintf(buf, "constraint not defined\n");
450 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
452 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
454 static ssize_t regulator_min_uV_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_uV);
464 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
466 static ssize_t regulator_max_uV_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_uV);
476 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
478 static ssize_t regulator_total_uA_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
481 struct regulator_dev *rdev = dev_get_drvdata(dev);
482 struct regulator *regulator;
485 mutex_lock(&rdev->mutex);
486 list_for_each_entry(regulator, &rdev->consumer_list, list)
487 uA += regulator->uA_load;
488 mutex_unlock(&rdev->mutex);
489 return sprintf(buf, "%d\n", uA);
491 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
493 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
496 struct regulator_dev *rdev = dev_get_drvdata(dev);
497 return sprintf(buf, "%d\n", rdev->use_count);
499 static DEVICE_ATTR_RO(num_users);
501 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
504 struct regulator_dev *rdev = dev_get_drvdata(dev);
506 switch (rdev->desc->type) {
507 case REGULATOR_VOLTAGE:
508 return sprintf(buf, "voltage\n");
509 case REGULATOR_CURRENT:
510 return sprintf(buf, "current\n");
512 return sprintf(buf, "unknown\n");
514 static DEVICE_ATTR_RO(type);
516 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
517 struct device_attribute *attr, char *buf)
519 struct regulator_dev *rdev = dev_get_drvdata(dev);
521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
523 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
524 regulator_suspend_mem_uV_show, NULL);
526 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
527 struct device_attribute *attr, char *buf)
529 struct regulator_dev *rdev = dev_get_drvdata(dev);
531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
533 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
534 regulator_suspend_disk_uV_show, NULL);
536 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
539 struct regulator_dev *rdev = dev_get_drvdata(dev);
541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
543 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
544 regulator_suspend_standby_uV_show, NULL);
546 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
547 struct device_attribute *attr, char *buf)
549 struct regulator_dev *rdev = dev_get_drvdata(dev);
551 return regulator_print_opmode(buf,
552 rdev->constraints->state_mem.mode);
554 static DEVICE_ATTR(suspend_mem_mode, 0444,
555 regulator_suspend_mem_mode_show, NULL);
557 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
558 struct device_attribute *attr, char *buf)
560 struct regulator_dev *rdev = dev_get_drvdata(dev);
562 return regulator_print_opmode(buf,
563 rdev->constraints->state_disk.mode);
565 static DEVICE_ATTR(suspend_disk_mode, 0444,
566 regulator_suspend_disk_mode_show, NULL);
568 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
569 struct device_attribute *attr, char *buf)
571 struct regulator_dev *rdev = dev_get_drvdata(dev);
573 return regulator_print_opmode(buf,
574 rdev->constraints->state_standby.mode);
576 static DEVICE_ATTR(suspend_standby_mode, 0444,
577 regulator_suspend_standby_mode_show, NULL);
579 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
582 struct regulator_dev *rdev = dev_get_drvdata(dev);
584 return regulator_print_state(buf,
585 rdev->constraints->state_mem.enabled);
587 static DEVICE_ATTR(suspend_mem_state, 0444,
588 regulator_suspend_mem_state_show, NULL);
590 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
591 struct device_attribute *attr, char *buf)
593 struct regulator_dev *rdev = dev_get_drvdata(dev);
595 return regulator_print_state(buf,
596 rdev->constraints->state_disk.enabled);
598 static DEVICE_ATTR(suspend_disk_state, 0444,
599 regulator_suspend_disk_state_show, NULL);
601 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
604 struct regulator_dev *rdev = dev_get_drvdata(dev);
606 return regulator_print_state(buf,
607 rdev->constraints->state_standby.enabled);
609 static DEVICE_ATTR(suspend_standby_state, 0444,
610 regulator_suspend_standby_state_show, NULL);
612 static ssize_t regulator_bypass_show(struct device *dev,
613 struct device_attribute *attr, char *buf)
615 struct regulator_dev *rdev = dev_get_drvdata(dev);
620 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
629 return sprintf(buf, "%s\n", report);
631 static DEVICE_ATTR(bypass, 0444,
632 regulator_bypass_show, NULL);
635 * These are the only attributes are present for all regulators.
636 * Other attributes are a function of regulator functionality.
638 static struct attribute *regulator_dev_attrs[] = {
640 &dev_attr_num_users.attr,
644 ATTRIBUTE_GROUPS(regulator_dev);
646 static void regulator_dev_release(struct device *dev)
648 struct regulator_dev *rdev = dev_get_drvdata(dev);
652 static struct class regulator_class = {
654 .dev_release = regulator_dev_release,
655 .dev_groups = regulator_dev_groups,
658 /* Calculate the new optimum regulator operating mode based on the new total
659 * consumer load. All locks held by caller */
660 static void drms_uA_update(struct regulator_dev *rdev)
662 struct regulator *sibling;
663 int current_uA = 0, output_uV, input_uV, err;
666 err = regulator_check_drms(rdev);
667 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
668 (!rdev->desc->ops->get_voltage &&
669 !rdev->desc->ops->get_voltage_sel) ||
670 !rdev->desc->ops->set_mode)
673 /* get output voltage */
674 output_uV = _regulator_get_voltage(rdev);
678 /* get input voltage */
681 input_uV = regulator_get_voltage(rdev->supply);
683 input_uV = rdev->constraints->input_uV;
687 /* calc total requested load */
688 list_for_each_entry(sibling, &rdev->consumer_list, list)
689 current_uA += sibling->uA_load;
691 /* now get the optimum mode for our new total regulator load */
692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
693 output_uV, current_uA);
695 /* check the new mode is allowed */
696 err = regulator_mode_constrain(rdev, &mode);
698 rdev->desc->ops->set_mode(rdev, mode);
701 static int suspend_set_state(struct regulator_dev *rdev,
702 struct regulator_state *rstate)
706 /* If we have no suspend mode configration don't set anything;
707 * only warn if the driver implements set_suspend_voltage or
708 * set_suspend_mode callback.
710 if (!rstate->enabled && !rstate->disabled) {
711 if (rdev->desc->ops->set_suspend_voltage ||
712 rdev->desc->ops->set_suspend_mode)
713 rdev_warn(rdev, "No configuration\n");
717 if (rstate->enabled && rstate->disabled) {
718 rdev_err(rdev, "invalid configuration\n");
722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
723 ret = rdev->desc->ops->set_suspend_enable(rdev);
724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
725 ret = rdev->desc->ops->set_suspend_disable(rdev);
726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
730 rdev_err(rdev, "failed to enabled/disable\n");
734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
737 rdev_err(rdev, "failed to set voltage\n");
742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
745 rdev_err(rdev, "failed to set mode\n");
752 /* locks held by caller */
753 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
755 if (!rdev->constraints)
759 case PM_SUSPEND_STANDBY:
760 return suspend_set_state(rdev,
761 &rdev->constraints->state_standby);
763 return suspend_set_state(rdev,
764 &rdev->constraints->state_mem);
766 return suspend_set_state(rdev,
767 &rdev->constraints->state_disk);
773 static void print_constraints(struct regulator_dev *rdev)
775 struct regulation_constraints *constraints = rdev->constraints;
780 if (constraints->min_uV && constraints->max_uV) {
781 if (constraints->min_uV == constraints->max_uV)
782 count += sprintf(buf + count, "%d mV ",
783 constraints->min_uV / 1000);
785 count += sprintf(buf + count, "%d <--> %d mV ",
786 constraints->min_uV / 1000,
787 constraints->max_uV / 1000);
790 if (!constraints->min_uV ||
791 constraints->min_uV != constraints->max_uV) {
792 ret = _regulator_get_voltage(rdev);
794 count += sprintf(buf + count, "at %d mV ", ret / 1000);
797 if (constraints->uV_offset)
798 count += sprintf(buf, "%dmV offset ",
799 constraints->uV_offset / 1000);
801 if (constraints->min_uA && constraints->max_uA) {
802 if (constraints->min_uA == constraints->max_uA)
803 count += sprintf(buf + count, "%d mA ",
804 constraints->min_uA / 1000);
806 count += sprintf(buf + count, "%d <--> %d mA ",
807 constraints->min_uA / 1000,
808 constraints->max_uA / 1000);
811 if (!constraints->min_uA ||
812 constraints->min_uA != constraints->max_uA) {
813 ret = _regulator_get_current_limit(rdev);
815 count += sprintf(buf + count, "at %d mA ", ret / 1000);
818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
819 count += sprintf(buf + count, "fast ");
820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
821 count += sprintf(buf + count, "normal ");
822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
823 count += sprintf(buf + count, "idle ");
824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
825 count += sprintf(buf + count, "standby");
828 sprintf(buf, "no parameters");
830 rdev_info(rdev, "%s\n", buf);
832 if ((constraints->min_uV != constraints->max_uV) &&
833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
838 static int machine_constraints_voltage(struct regulator_dev *rdev,
839 struct regulation_constraints *constraints)
841 struct regulator_ops *ops = rdev->desc->ops;
844 /* do we need to apply the constraint voltage */
845 if (rdev->constraints->apply_uV &&
846 rdev->constraints->min_uV == rdev->constraints->max_uV) {
847 int current_uV = _regulator_get_voltage(rdev);
848 if (current_uV < 0) {
849 rdev_err(rdev, "failed to get the current voltage\n");
852 if (current_uV < rdev->constraints->min_uV ||
853 current_uV > rdev->constraints->max_uV) {
854 ret = _regulator_do_set_voltage(
855 rdev, rdev->constraints->min_uV,
856 rdev->constraints->max_uV);
859 "failed to apply %duV constraint\n",
860 rdev->constraints->min_uV);
866 /* constrain machine-level voltage specs to fit
867 * the actual range supported by this regulator.
869 if (ops->list_voltage && rdev->desc->n_voltages) {
870 int count = rdev->desc->n_voltages;
872 int min_uV = INT_MAX;
873 int max_uV = INT_MIN;
874 int cmin = constraints->min_uV;
875 int cmax = constraints->max_uV;
877 /* it's safe to autoconfigure fixed-voltage supplies
878 and the constraints are used by list_voltage. */
879 if (count == 1 && !cmin) {
882 constraints->min_uV = cmin;
883 constraints->max_uV = cmax;
886 /* voltage constraints are optional */
887 if ((cmin == 0) && (cmax == 0))
890 /* else require explicit machine-level constraints */
891 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
892 rdev_err(rdev, "invalid voltage constraints\n");
896 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
897 for (i = 0; i < count; i++) {
900 value = ops->list_voltage(rdev, i);
904 /* maybe adjust [min_uV..max_uV] */
905 if (value >= cmin && value < min_uV)
907 if (value <= cmax && value > max_uV)
911 /* final: [min_uV..max_uV] valid iff constraints valid */
912 if (max_uV < min_uV) {
914 "unsupportable voltage constraints %u-%uuV\n",
919 /* use regulator's subset of machine constraints */
920 if (constraints->min_uV < min_uV) {
921 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
922 constraints->min_uV, min_uV);
923 constraints->min_uV = min_uV;
925 if (constraints->max_uV > max_uV) {
926 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
927 constraints->max_uV, max_uV);
928 constraints->max_uV = max_uV;
935 static int machine_constraints_current(struct regulator_dev *rdev,
936 struct regulation_constraints *constraints)
938 struct regulator_ops *ops = rdev->desc->ops;
941 if (!constraints->min_uA && !constraints->max_uA)
944 if (constraints->min_uA > constraints->max_uA) {
945 rdev_err(rdev, "Invalid current constraints\n");
949 if (!ops->set_current_limit || !ops->get_current_limit) {
950 rdev_warn(rdev, "Operation of current configuration missing\n");
954 /* Set regulator current in constraints range */
955 ret = ops->set_current_limit(rdev, constraints->min_uA,
956 constraints->max_uA);
958 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
965 static int _regulator_do_enable(struct regulator_dev *rdev);
968 * set_machine_constraints - sets regulator constraints
969 * @rdev: regulator source
970 * @constraints: constraints to apply
972 * Allows platform initialisation code to define and constrain
973 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
974 * Constraints *must* be set by platform code in order for some
975 * regulator operations to proceed i.e. set_voltage, set_current_limit,
978 static int set_machine_constraints(struct regulator_dev *rdev,
979 const struct regulation_constraints *constraints)
982 struct regulator_ops *ops = rdev->desc->ops;
985 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
988 rdev->constraints = kzalloc(sizeof(*constraints),
990 if (!rdev->constraints)
993 ret = machine_constraints_voltage(rdev, rdev->constraints);
997 ret = machine_constraints_current(rdev, rdev->constraints);
1001 /* do we need to setup our suspend state */
1002 if (rdev->constraints->initial_state) {
1003 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1005 rdev_err(rdev, "failed to set suspend state\n");
1010 if (rdev->constraints->initial_mode) {
1011 if (!ops->set_mode) {
1012 rdev_err(rdev, "no set_mode operation\n");
1017 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1019 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1024 /* If the constraints say the regulator should be on at this point
1025 * and we have control then make sure it is enabled.
1027 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1028 ret = _regulator_do_enable(rdev);
1029 if (ret < 0 && ret != -EINVAL) {
1030 rdev_err(rdev, "failed to enable\n");
1035 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1036 && ops->set_ramp_delay) {
1037 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1039 rdev_err(rdev, "failed to set ramp_delay\n");
1044 print_constraints(rdev);
1047 kfree(rdev->constraints);
1048 rdev->constraints = NULL;
1053 * set_supply - set regulator supply regulator
1054 * @rdev: regulator name
1055 * @supply_rdev: supply regulator name
1057 * Called by platform initialisation code to set the supply regulator for this
1058 * regulator. This ensures that a regulators supply will also be enabled by the
1059 * core if it's child is enabled.
1061 static int set_supply(struct regulator_dev *rdev,
1062 struct regulator_dev *supply_rdev)
1066 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1068 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1069 if (rdev->supply == NULL) {
1073 supply_rdev->open_count++;
1079 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1080 * @rdev: regulator source
1081 * @consumer_dev_name: dev_name() string for device supply applies to
1082 * @supply: symbolic name for supply
1084 * Allows platform initialisation code to map physical regulator
1085 * sources to symbolic names for supplies for use by devices. Devices
1086 * should use these symbolic names to request regulators, avoiding the
1087 * need to provide board-specific regulator names as platform data.
1089 static int set_consumer_device_supply(struct regulator_dev *rdev,
1090 const char *consumer_dev_name,
1093 struct regulator_map *node;
1099 if (consumer_dev_name != NULL)
1104 list_for_each_entry(node, ®ulator_map_list, list) {
1105 if (node->dev_name && consumer_dev_name) {
1106 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1108 } else if (node->dev_name || consumer_dev_name) {
1112 if (strcmp(node->supply, supply) != 0)
1115 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1117 dev_name(&node->regulator->dev),
1118 node->regulator->desc->name,
1120 dev_name(&rdev->dev), rdev_get_name(rdev));
1124 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1128 node->regulator = rdev;
1129 node->supply = supply;
1132 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1133 if (node->dev_name == NULL) {
1139 list_add(&node->list, ®ulator_map_list);
1143 static void unset_regulator_supplies(struct regulator_dev *rdev)
1145 struct regulator_map *node, *n;
1147 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1148 if (rdev == node->regulator) {
1149 list_del(&node->list);
1150 kfree(node->dev_name);
1156 #define REG_STR_SIZE 64
1158 static struct regulator *create_regulator(struct regulator_dev *rdev,
1160 const char *supply_name)
1162 struct regulator *regulator;
1163 char buf[REG_STR_SIZE];
1166 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1167 if (regulator == NULL)
1170 mutex_lock(&rdev->mutex);
1171 regulator->rdev = rdev;
1172 list_add(®ulator->list, &rdev->consumer_list);
1175 regulator->dev = dev;
1177 /* Add a link to the device sysfs entry */
1178 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1179 dev->kobj.name, supply_name);
1180 if (size >= REG_STR_SIZE)
1183 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1184 if (regulator->supply_name == NULL)
1187 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1190 rdev_warn(rdev, "could not add device link %s err %d\n",
1191 dev->kobj.name, err);
1195 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1196 if (regulator->supply_name == NULL)
1200 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1202 if (!regulator->debugfs) {
1203 rdev_warn(rdev, "Failed to create debugfs directory\n");
1205 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1206 ®ulator->uA_load);
1207 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1208 ®ulator->min_uV);
1209 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1210 ®ulator->max_uV);
1214 * Check now if the regulator is an always on regulator - if
1215 * it is then we don't need to do nearly so much work for
1216 * enable/disable calls.
1218 if (!_regulator_can_change_status(rdev) &&
1219 _regulator_is_enabled(rdev))
1220 regulator->always_on = true;
1222 mutex_unlock(&rdev->mutex);
1225 list_del(®ulator->list);
1227 mutex_unlock(&rdev->mutex);
1231 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1233 if (rdev->constraints && rdev->constraints->enable_time)
1234 return rdev->constraints->enable_time;
1235 if (!rdev->desc->ops->enable_time)
1236 return rdev->desc->enable_time;
1237 return rdev->desc->ops->enable_time(rdev);
1240 static struct regulator_supply_alias *regulator_find_supply_alias(
1241 struct device *dev, const char *supply)
1243 struct regulator_supply_alias *map;
1245 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1246 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1252 static void regulator_supply_alias(struct device **dev, const char **supply)
1254 struct regulator_supply_alias *map;
1256 map = regulator_find_supply_alias(*dev, *supply);
1258 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1259 *supply, map->alias_supply,
1260 dev_name(map->alias_dev));
1261 *dev = map->alias_dev;
1262 *supply = map->alias_supply;
1266 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1270 struct regulator_dev *r;
1271 struct device_node *node;
1272 struct regulator_map *map;
1273 const char *devname = NULL;
1275 regulator_supply_alias(&dev, &supply);
1277 /* first do a dt based lookup */
1278 if (dev && dev->of_node) {
1279 node = of_get_regulator(dev, supply);
1281 list_for_each_entry(r, ®ulator_list, list)
1282 if (r->dev.parent &&
1283 node == r->dev.of_node)
1285 *ret = -EPROBE_DEFER;
1289 * If we couldn't even get the node then it's
1290 * not just that the device didn't register
1291 * yet, there's no node and we'll never
1298 /* if not found, try doing it non-dt way */
1300 devname = dev_name(dev);
1302 list_for_each_entry(r, ®ulator_list, list)
1303 if (strcmp(rdev_get_name(r), supply) == 0)
1306 list_for_each_entry(map, ®ulator_map_list, list) {
1307 /* If the mapping has a device set up it must match */
1308 if (map->dev_name &&
1309 (!devname || strcmp(map->dev_name, devname)))
1312 if (strcmp(map->supply, supply) == 0)
1313 return map->regulator;
1320 /* Internal regulator request function */
1321 static struct regulator *_regulator_get(struct device *dev, const char *id,
1322 bool exclusive, bool allow_dummy)
1324 struct regulator_dev *rdev;
1325 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1326 const char *devname = NULL;
1330 pr_err("get() with no identifier\n");
1331 return ERR_PTR(-EINVAL);
1335 devname = dev_name(dev);
1337 if (have_full_constraints())
1340 ret = -EPROBE_DEFER;
1342 mutex_lock(®ulator_list_mutex);
1344 rdev = regulator_dev_lookup(dev, id, &ret);
1348 regulator = ERR_PTR(ret);
1351 * If we have return value from dev_lookup fail, we do not expect to
1352 * succeed, so, quit with appropriate error value
1354 if (ret && ret != -ENODEV)
1358 devname = "deviceless";
1361 * Assume that a regulator is physically present and enabled
1362 * even if it isn't hooked up and just provide a dummy.
1364 if (have_full_constraints() && allow_dummy) {
1365 pr_warn("%s supply %s not found, using dummy regulator\n",
1368 rdev = dummy_regulator_rdev;
1370 /* Don't log an error when called from regulator_get_optional() */
1371 } else if (!have_full_constraints() || exclusive) {
1372 dev_warn(dev, "dummy supplies not allowed\n");
1375 mutex_unlock(®ulator_list_mutex);
1379 if (rdev->exclusive) {
1380 regulator = ERR_PTR(-EPERM);
1384 if (exclusive && rdev->open_count) {
1385 regulator = ERR_PTR(-EBUSY);
1389 if (!try_module_get(rdev->owner))
1392 regulator = create_regulator(rdev, dev, id);
1393 if (regulator == NULL) {
1394 regulator = ERR_PTR(-ENOMEM);
1395 module_put(rdev->owner);
1401 rdev->exclusive = 1;
1403 ret = _regulator_is_enabled(rdev);
1405 rdev->use_count = 1;
1407 rdev->use_count = 0;
1411 mutex_unlock(®ulator_list_mutex);
1417 * regulator_get - lookup and obtain a reference to a regulator.
1418 * @dev: device for regulator "consumer"
1419 * @id: Supply name or regulator ID.
1421 * Returns a struct regulator corresponding to the regulator producer,
1422 * or IS_ERR() condition containing errno.
1424 * Use of supply names configured via regulator_set_device_supply() is
1425 * strongly encouraged. It is recommended that the supply name used
1426 * should match the name used for the supply and/or the relevant
1427 * device pins in the datasheet.
1429 struct regulator *regulator_get(struct device *dev, const char *id)
1431 return _regulator_get(dev, id, false, true);
1433 EXPORT_SYMBOL_GPL(regulator_get);
1436 * regulator_get_exclusive - obtain exclusive access to a regulator.
1437 * @dev: device for regulator "consumer"
1438 * @id: Supply name or regulator ID.
1440 * Returns a struct regulator corresponding to the regulator producer,
1441 * or IS_ERR() condition containing errno. Other consumers will be
1442 * unable to obtain this regulator while this reference is held and the
1443 * use count for the regulator will be initialised to reflect the current
1444 * state of the regulator.
1446 * This is intended for use by consumers which cannot tolerate shared
1447 * use of the regulator such as those which need to force the
1448 * regulator off for correct operation of the hardware they are
1451 * Use of supply names configured via regulator_set_device_supply() is
1452 * strongly encouraged. It is recommended that the supply name used
1453 * should match the name used for the supply and/or the relevant
1454 * device pins in the datasheet.
1456 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1458 return _regulator_get(dev, id, true, false);
1460 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1463 * regulator_get_optional - obtain optional access to a regulator.
1464 * @dev: device for regulator "consumer"
1465 * @id: Supply name or regulator ID.
1467 * Returns a struct regulator corresponding to the regulator producer,
1468 * or IS_ERR() condition containing errno.
1470 * This is intended for use by consumers for devices which can have
1471 * some supplies unconnected in normal use, such as some MMC devices.
1472 * It can allow the regulator core to provide stub supplies for other
1473 * supplies requested using normal regulator_get() calls without
1474 * disrupting the operation of drivers that can handle absent
1477 * Use of supply names configured via regulator_set_device_supply() is
1478 * strongly encouraged. It is recommended that the supply name used
1479 * should match the name used for the supply and/or the relevant
1480 * device pins in the datasheet.
1482 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1484 return _regulator_get(dev, id, false, false);
1486 EXPORT_SYMBOL_GPL(regulator_get_optional);
1488 /* Locks held by regulator_put() */
1489 static void _regulator_put(struct regulator *regulator)
1491 struct regulator_dev *rdev;
1493 if (regulator == NULL || IS_ERR(regulator))
1496 rdev = regulator->rdev;
1498 debugfs_remove_recursive(regulator->debugfs);
1500 /* remove any sysfs entries */
1502 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1503 kfree(regulator->supply_name);
1504 list_del(®ulator->list);
1508 rdev->exclusive = 0;
1510 module_put(rdev->owner);
1514 * regulator_put - "free" the regulator source
1515 * @regulator: regulator source
1517 * Note: drivers must ensure that all regulator_enable calls made on this
1518 * regulator source are balanced by regulator_disable calls prior to calling
1521 void regulator_put(struct regulator *regulator)
1523 mutex_lock(®ulator_list_mutex);
1524 _regulator_put(regulator);
1525 mutex_unlock(®ulator_list_mutex);
1527 EXPORT_SYMBOL_GPL(regulator_put);
1530 * regulator_register_supply_alias - Provide device alias for supply lookup
1532 * @dev: device that will be given as the regulator "consumer"
1533 * @id: Supply name or regulator ID
1534 * @alias_dev: device that should be used to lookup the supply
1535 * @alias_id: Supply name or regulator ID that should be used to lookup the
1538 * All lookups for id on dev will instead be conducted for alias_id on
1541 int regulator_register_supply_alias(struct device *dev, const char *id,
1542 struct device *alias_dev,
1543 const char *alias_id)
1545 struct regulator_supply_alias *map;
1547 map = regulator_find_supply_alias(dev, id);
1551 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1556 map->src_supply = id;
1557 map->alias_dev = alias_dev;
1558 map->alias_supply = alias_id;
1560 list_add(&map->list, ®ulator_supply_alias_list);
1562 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1563 id, dev_name(dev), alias_id, dev_name(alias_dev));
1567 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1570 * regulator_unregister_supply_alias - Remove device alias
1572 * @dev: device that will be given as the regulator "consumer"
1573 * @id: Supply name or regulator ID
1575 * Remove a lookup alias if one exists for id on dev.
1577 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1579 struct regulator_supply_alias *map;
1581 map = regulator_find_supply_alias(dev, id);
1583 list_del(&map->list);
1587 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1590 * regulator_bulk_register_supply_alias - register multiple aliases
1592 * @dev: device that will be given as the regulator "consumer"
1593 * @id: List of supply names or regulator IDs
1594 * @alias_dev: device that should be used to lookup the supply
1595 * @alias_id: List of supply names or regulator IDs that should be used to
1597 * @num_id: Number of aliases to register
1599 * @return 0 on success, an errno on failure.
1601 * This helper function allows drivers to register several supply
1602 * aliases in one operation. If any of the aliases cannot be
1603 * registered any aliases that were registered will be removed
1604 * before returning to the caller.
1606 int regulator_bulk_register_supply_alias(struct device *dev,
1607 const char *const *id,
1608 struct device *alias_dev,
1609 const char *const *alias_id,
1615 for (i = 0; i < num_id; ++i) {
1616 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1626 "Failed to create supply alias %s,%s -> %s,%s\n",
1627 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1630 regulator_unregister_supply_alias(dev, id[i]);
1634 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1637 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1639 * @dev: device that will be given as the regulator "consumer"
1640 * @id: List of supply names or regulator IDs
1641 * @num_id: Number of aliases to unregister
1643 * This helper function allows drivers to unregister several supply
1644 * aliases in one operation.
1646 void regulator_bulk_unregister_supply_alias(struct device *dev,
1647 const char *const *id,
1652 for (i = 0; i < num_id; ++i)
1653 regulator_unregister_supply_alias(dev, id[i]);
1655 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1658 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1659 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1660 const struct regulator_config *config)
1662 struct regulator_enable_gpio *pin;
1665 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1666 if (pin->gpio == config->ena_gpio) {
1667 rdev_dbg(rdev, "GPIO %d is already used\n",
1669 goto update_ena_gpio_to_rdev;
1673 ret = gpio_request_one(config->ena_gpio,
1674 GPIOF_DIR_OUT | config->ena_gpio_flags,
1675 rdev_get_name(rdev));
1679 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1681 gpio_free(config->ena_gpio);
1685 pin->gpio = config->ena_gpio;
1686 pin->ena_gpio_invert = config->ena_gpio_invert;
1687 list_add(&pin->list, ®ulator_ena_gpio_list);
1689 update_ena_gpio_to_rdev:
1690 pin->request_count++;
1691 rdev->ena_pin = pin;
1695 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1697 struct regulator_enable_gpio *pin, *n;
1702 /* Free the GPIO only in case of no use */
1703 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1704 if (pin->gpio == rdev->ena_pin->gpio) {
1705 if (pin->request_count <= 1) {
1706 pin->request_count = 0;
1707 gpio_free(pin->gpio);
1708 list_del(&pin->list);
1711 pin->request_count--;
1718 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1719 * @rdev: regulator_dev structure
1720 * @enable: enable GPIO at initial use?
1722 * GPIO is enabled in case of initial use. (enable_count is 0)
1723 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1725 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1727 struct regulator_enable_gpio *pin = rdev->ena_pin;
1733 /* Enable GPIO at initial use */
1734 if (pin->enable_count == 0)
1735 gpio_set_value_cansleep(pin->gpio,
1736 !pin->ena_gpio_invert);
1738 pin->enable_count++;
1740 if (pin->enable_count > 1) {
1741 pin->enable_count--;
1745 /* Disable GPIO if not used */
1746 if (pin->enable_count <= 1) {
1747 gpio_set_value_cansleep(pin->gpio,
1748 pin->ena_gpio_invert);
1749 pin->enable_count = 0;
1756 static int _regulator_do_enable(struct regulator_dev *rdev)
1760 /* Query before enabling in case configuration dependent. */
1761 ret = _regulator_get_enable_time(rdev);
1765 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1769 trace_regulator_enable(rdev_get_name(rdev));
1771 if (rdev->ena_pin) {
1772 ret = regulator_ena_gpio_ctrl(rdev, true);
1775 rdev->ena_gpio_state = 1;
1776 } else if (rdev->desc->ops->enable) {
1777 ret = rdev->desc->ops->enable(rdev);
1784 /* Allow the regulator to ramp; it would be useful to extend
1785 * this for bulk operations so that the regulators can ramp
1787 trace_regulator_enable_delay(rdev_get_name(rdev));
1790 * Delay for the requested amount of time as per the guidelines in:
1792 * Documentation/timers/timers-howto.txt
1794 * The assumption here is that regulators will never be enabled in
1795 * atomic context and therefore sleeping functions can be used.
1798 unsigned int ms = delay / 1000;
1799 unsigned int us = delay % 1000;
1803 * For small enough values, handle super-millisecond
1804 * delays in the usleep_range() call below.
1813 * Give the scheduler some room to coalesce with any other
1814 * wakeup sources. For delays shorter than 10 us, don't even
1815 * bother setting up high-resolution timers and just busy-
1819 usleep_range(us, us + 100);
1824 trace_regulator_enable_complete(rdev_get_name(rdev));
1829 /* locks held by regulator_enable() */
1830 static int _regulator_enable(struct regulator_dev *rdev)
1834 /* check voltage and requested load before enabling */
1835 if (rdev->constraints &&
1836 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1837 drms_uA_update(rdev);
1839 if (rdev->use_count == 0) {
1840 /* The regulator may on if it's not switchable or left on */
1841 ret = _regulator_is_enabled(rdev);
1842 if (ret == -EINVAL || ret == 0) {
1843 if (!_regulator_can_change_status(rdev))
1846 ret = _regulator_do_enable(rdev);
1850 } else if (ret < 0) {
1851 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1854 /* Fallthrough on positive return values - already enabled */
1863 * regulator_enable - enable regulator output
1864 * @regulator: regulator source
1866 * Request that the regulator be enabled with the regulator output at
1867 * the predefined voltage or current value. Calls to regulator_enable()
1868 * must be balanced with calls to regulator_disable().
1870 * NOTE: the output value can be set by other drivers, boot loader or may be
1871 * hardwired in the regulator.
1873 int regulator_enable(struct regulator *regulator)
1875 struct regulator_dev *rdev = regulator->rdev;
1878 if (regulator->always_on)
1882 ret = regulator_enable(rdev->supply);
1887 mutex_lock(&rdev->mutex);
1888 ret = _regulator_enable(rdev);
1889 mutex_unlock(&rdev->mutex);
1891 if (ret != 0 && rdev->supply)
1892 regulator_disable(rdev->supply);
1896 EXPORT_SYMBOL_GPL(regulator_enable);
1898 static int _regulator_do_disable(struct regulator_dev *rdev)
1902 trace_regulator_disable(rdev_get_name(rdev));
1904 if (rdev->ena_pin) {
1905 ret = regulator_ena_gpio_ctrl(rdev, false);
1908 rdev->ena_gpio_state = 0;
1910 } else if (rdev->desc->ops->disable) {
1911 ret = rdev->desc->ops->disable(rdev);
1916 trace_regulator_disable_complete(rdev_get_name(rdev));
1921 /* locks held by regulator_disable() */
1922 static int _regulator_disable(struct regulator_dev *rdev)
1926 if (WARN(rdev->use_count <= 0,
1927 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1930 /* are we the last user and permitted to disable ? */
1931 if (rdev->use_count == 1 &&
1932 (rdev->constraints && !rdev->constraints->always_on)) {
1934 /* we are last user */
1935 if (_regulator_can_change_status(rdev)) {
1936 ret = _regulator_do_disable(rdev);
1938 rdev_err(rdev, "failed to disable\n");
1941 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1945 rdev->use_count = 0;
1946 } else if (rdev->use_count > 1) {
1948 if (rdev->constraints &&
1949 (rdev->constraints->valid_ops_mask &
1950 REGULATOR_CHANGE_DRMS))
1951 drms_uA_update(rdev);
1960 * regulator_disable - disable regulator output
1961 * @regulator: regulator source
1963 * Disable the regulator output voltage or current. Calls to
1964 * regulator_enable() must be balanced with calls to
1965 * regulator_disable().
1967 * NOTE: this will only disable the regulator output if no other consumer
1968 * devices have it enabled, the regulator device supports disabling and
1969 * machine constraints permit this operation.
1971 int regulator_disable(struct regulator *regulator)
1973 struct regulator_dev *rdev = regulator->rdev;
1976 if (regulator->always_on)
1979 mutex_lock(&rdev->mutex);
1980 ret = _regulator_disable(rdev);
1981 mutex_unlock(&rdev->mutex);
1983 if (ret == 0 && rdev->supply)
1984 regulator_disable(rdev->supply);
1988 EXPORT_SYMBOL_GPL(regulator_disable);
1990 /* locks held by regulator_force_disable() */
1991 static int _regulator_force_disable(struct regulator_dev *rdev)
1995 ret = _regulator_do_disable(rdev);
1997 rdev_err(rdev, "failed to force disable\n");
2001 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2002 REGULATOR_EVENT_DISABLE, NULL);
2008 * regulator_force_disable - force disable regulator output
2009 * @regulator: regulator source
2011 * Forcibly disable the regulator output voltage or current.
2012 * NOTE: this *will* disable the regulator output even if other consumer
2013 * devices have it enabled. This should be used for situations when device
2014 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2016 int regulator_force_disable(struct regulator *regulator)
2018 struct regulator_dev *rdev = regulator->rdev;
2021 mutex_lock(&rdev->mutex);
2022 regulator->uA_load = 0;
2023 ret = _regulator_force_disable(regulator->rdev);
2024 mutex_unlock(&rdev->mutex);
2027 while (rdev->open_count--)
2028 regulator_disable(rdev->supply);
2032 EXPORT_SYMBOL_GPL(regulator_force_disable);
2034 static void regulator_disable_work(struct work_struct *work)
2036 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2040 mutex_lock(&rdev->mutex);
2042 BUG_ON(!rdev->deferred_disables);
2044 count = rdev->deferred_disables;
2045 rdev->deferred_disables = 0;
2047 for (i = 0; i < count; i++) {
2048 ret = _regulator_disable(rdev);
2050 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2053 mutex_unlock(&rdev->mutex);
2056 for (i = 0; i < count; i++) {
2057 ret = regulator_disable(rdev->supply);
2060 "Supply disable failed: %d\n", ret);
2067 * regulator_disable_deferred - disable regulator output with delay
2068 * @regulator: regulator source
2069 * @ms: miliseconds until the regulator is disabled
2071 * Execute regulator_disable() on the regulator after a delay. This
2072 * is intended for use with devices that require some time to quiesce.
2074 * NOTE: this will only disable the regulator output if no other consumer
2075 * devices have it enabled, the regulator device supports disabling and
2076 * machine constraints permit this operation.
2078 int regulator_disable_deferred(struct regulator *regulator, int ms)
2080 struct regulator_dev *rdev = regulator->rdev;
2083 if (regulator->always_on)
2087 return regulator_disable(regulator);
2089 mutex_lock(&rdev->mutex);
2090 rdev->deferred_disables++;
2091 mutex_unlock(&rdev->mutex);
2093 ret = queue_delayed_work(system_power_efficient_wq,
2094 &rdev->disable_work,
2095 msecs_to_jiffies(ms));
2101 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2103 static int _regulator_is_enabled(struct regulator_dev *rdev)
2105 /* A GPIO control always takes precedence */
2107 return rdev->ena_gpio_state;
2109 /* If we don't know then assume that the regulator is always on */
2110 if (!rdev->desc->ops->is_enabled)
2113 return rdev->desc->ops->is_enabled(rdev);
2117 * regulator_is_enabled - is the regulator output enabled
2118 * @regulator: regulator source
2120 * Returns positive if the regulator driver backing the source/client
2121 * has requested that the device be enabled, zero if it hasn't, else a
2122 * negative errno code.
2124 * Note that the device backing this regulator handle can have multiple
2125 * users, so it might be enabled even if regulator_enable() was never
2126 * called for this particular source.
2128 int regulator_is_enabled(struct regulator *regulator)
2132 if (regulator->always_on)
2135 mutex_lock(®ulator->rdev->mutex);
2136 ret = _regulator_is_enabled(regulator->rdev);
2137 mutex_unlock(®ulator->rdev->mutex);
2141 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2144 * regulator_can_change_voltage - check if regulator can change voltage
2145 * @regulator: regulator source
2147 * Returns positive if the regulator driver backing the source/client
2148 * can change its voltage, false otherwise. Useful for detecting fixed
2149 * or dummy regulators and disabling voltage change logic in the client
2152 int regulator_can_change_voltage(struct regulator *regulator)
2154 struct regulator_dev *rdev = regulator->rdev;
2156 if (rdev->constraints &&
2157 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2158 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2161 if (rdev->desc->continuous_voltage_range &&
2162 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2163 rdev->constraints->min_uV != rdev->constraints->max_uV)
2169 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2172 * regulator_count_voltages - count regulator_list_voltage() selectors
2173 * @regulator: regulator source
2175 * Returns number of selectors, or negative errno. Selectors are
2176 * numbered starting at zero, and typically correspond to bitfields
2177 * in hardware registers.
2179 int regulator_count_voltages(struct regulator *regulator)
2181 struct regulator_dev *rdev = regulator->rdev;
2183 return rdev->desc->n_voltages ? : -EINVAL;
2185 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2188 * regulator_list_voltage - enumerate supported voltages
2189 * @regulator: regulator source
2190 * @selector: identify voltage to list
2191 * Context: can sleep
2193 * Returns a voltage that can be passed to @regulator_set_voltage(),
2194 * zero if this selector code can't be used on this system, or a
2197 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2199 struct regulator_dev *rdev = regulator->rdev;
2200 struct regulator_ops *ops = rdev->desc->ops;
2203 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2204 return rdev->desc->fixed_uV;
2206 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2209 mutex_lock(&rdev->mutex);
2210 ret = ops->list_voltage(rdev, selector);
2211 mutex_unlock(&rdev->mutex);
2214 if (ret < rdev->constraints->min_uV)
2216 else if (ret > rdev->constraints->max_uV)
2222 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2225 * regulator_get_regmap - get the regulator's register map
2226 * @regulator: regulator source
2228 * Returns the register map for the given regulator, or an ERR_PTR value
2229 * if the regulator doesn't use regmap.
2231 struct regmap *regulator_get_regmap(struct regulator *regulator)
2233 struct regmap *map = regulator->rdev->regmap;
2235 return map ? map : ERR_PTR(-EOPNOTSUPP);
2239 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2240 * @regulator: regulator source
2241 * @vsel_reg: voltage selector register, output parameter
2242 * @vsel_mask: mask for voltage selector bitfield, output parameter
2244 * Returns the hardware register offset and bitmask used for setting the
2245 * regulator voltage. This might be useful when configuring voltage-scaling
2246 * hardware or firmware that can make I2C requests behind the kernel's back,
2249 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2250 * and 0 is returned, otherwise a negative errno is returned.
2252 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2254 unsigned *vsel_mask)
2256 struct regulator_dev *rdev = regulator->rdev;
2257 struct regulator_ops *ops = rdev->desc->ops;
2259 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2262 *vsel_reg = rdev->desc->vsel_reg;
2263 *vsel_mask = rdev->desc->vsel_mask;
2267 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2270 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2271 * @regulator: regulator source
2272 * @selector: identify voltage to list
2274 * Converts the selector to a hardware-specific voltage selector that can be
2275 * directly written to the regulator registers. The address of the voltage
2276 * register can be determined by calling @regulator_get_hardware_vsel_register.
2278 * On error a negative errno is returned.
2280 int regulator_list_hardware_vsel(struct regulator *regulator,
2283 struct regulator_dev *rdev = regulator->rdev;
2284 struct regulator_ops *ops = rdev->desc->ops;
2286 if (selector >= rdev->desc->n_voltages)
2288 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2293 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2296 * regulator_get_linear_step - return the voltage step size between VSEL values
2297 * @regulator: regulator source
2299 * Returns the voltage step size between VSEL values for linear
2300 * regulators, or return 0 if the regulator isn't a linear regulator.
2302 unsigned int regulator_get_linear_step(struct regulator *regulator)
2304 struct regulator_dev *rdev = regulator->rdev;
2306 return rdev->desc->uV_step;
2308 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2311 * regulator_is_supported_voltage - check if a voltage range can be supported
2313 * @regulator: Regulator to check.
2314 * @min_uV: Minimum required voltage in uV.
2315 * @max_uV: Maximum required voltage in uV.
2317 * Returns a boolean or a negative error code.
2319 int regulator_is_supported_voltage(struct regulator *regulator,
2320 int min_uV, int max_uV)
2322 struct regulator_dev *rdev = regulator->rdev;
2323 int i, voltages, ret;
2325 /* If we can't change voltage check the current voltage */
2326 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2327 ret = regulator_get_voltage(regulator);
2329 return min_uV <= ret && ret <= max_uV;
2334 /* Any voltage within constrains range is fine? */
2335 if (rdev->desc->continuous_voltage_range)
2336 return min_uV >= rdev->constraints->min_uV &&
2337 max_uV <= rdev->constraints->max_uV;
2339 ret = regulator_count_voltages(regulator);
2344 for (i = 0; i < voltages; i++) {
2345 ret = regulator_list_voltage(regulator, i);
2347 if (ret >= min_uV && ret <= max_uV)
2353 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2355 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2356 int min_uV, int max_uV)
2361 unsigned int selector;
2362 int old_selector = -1;
2364 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2366 min_uV += rdev->constraints->uV_offset;
2367 max_uV += rdev->constraints->uV_offset;
2370 * If we can't obtain the old selector there is not enough
2371 * info to call set_voltage_time_sel().
2373 if (_regulator_is_enabled(rdev) &&
2374 rdev->desc->ops->set_voltage_time_sel &&
2375 rdev->desc->ops->get_voltage_sel) {
2376 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2377 if (old_selector < 0)
2378 return old_selector;
2381 if (rdev->desc->ops->set_voltage) {
2382 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2386 if (rdev->desc->ops->list_voltage)
2387 best_val = rdev->desc->ops->list_voltage(rdev,
2390 best_val = _regulator_get_voltage(rdev);
2393 } else if (rdev->desc->ops->set_voltage_sel) {
2394 if (rdev->desc->ops->map_voltage) {
2395 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2398 if (rdev->desc->ops->list_voltage ==
2399 regulator_list_voltage_linear)
2400 ret = regulator_map_voltage_linear(rdev,
2402 else if (rdev->desc->ops->list_voltage ==
2403 regulator_list_voltage_linear_range)
2404 ret = regulator_map_voltage_linear_range(rdev,
2407 ret = regulator_map_voltage_iterate(rdev,
2412 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2413 if (min_uV <= best_val && max_uV >= best_val) {
2415 if (old_selector == selector)
2418 ret = rdev->desc->ops->set_voltage_sel(
2428 /* Call set_voltage_time_sel if successfully obtained old_selector */
2429 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2430 && old_selector != selector) {
2432 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2433 old_selector, selector);
2435 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2440 /* Insert any necessary delays */
2441 if (delay >= 1000) {
2442 mdelay(delay / 1000);
2443 udelay(delay % 1000);
2449 if (ret == 0 && best_val >= 0) {
2450 unsigned long data = best_val;
2452 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2456 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2462 * regulator_set_voltage - set regulator output voltage
2463 * @regulator: regulator source
2464 * @min_uV: Minimum required voltage in uV
2465 * @max_uV: Maximum acceptable voltage in uV
2467 * Sets a voltage regulator to the desired output voltage. This can be set
2468 * during any regulator state. IOW, regulator can be disabled or enabled.
2470 * If the regulator is enabled then the voltage will change to the new value
2471 * immediately otherwise if the regulator is disabled the regulator will
2472 * output at the new voltage when enabled.
2474 * NOTE: If the regulator is shared between several devices then the lowest
2475 * request voltage that meets the system constraints will be used.
2476 * Regulator system constraints must be set for this regulator before
2477 * calling this function otherwise this call will fail.
2479 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2481 struct regulator_dev *rdev = regulator->rdev;
2483 int old_min_uV, old_max_uV;
2486 mutex_lock(&rdev->mutex);
2488 /* If we're setting the same range as last time the change
2489 * should be a noop (some cpufreq implementations use the same
2490 * voltage for multiple frequencies, for example).
2492 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2495 /* If we're trying to set a range that overlaps the current voltage,
2496 * return succesfully even though the regulator does not support
2497 * changing the voltage.
2499 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2500 current_uV = _regulator_get_voltage(rdev);
2501 if (min_uV <= current_uV && current_uV <= max_uV) {
2502 regulator->min_uV = min_uV;
2503 regulator->max_uV = max_uV;
2509 if (!rdev->desc->ops->set_voltage &&
2510 !rdev->desc->ops->set_voltage_sel) {
2515 /* constraints check */
2516 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2520 /* restore original values in case of error */
2521 old_min_uV = regulator->min_uV;
2522 old_max_uV = regulator->max_uV;
2523 regulator->min_uV = min_uV;
2524 regulator->max_uV = max_uV;
2526 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2530 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2535 mutex_unlock(&rdev->mutex);
2538 regulator->min_uV = old_min_uV;
2539 regulator->max_uV = old_max_uV;
2540 mutex_unlock(&rdev->mutex);
2543 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2546 * regulator_set_voltage_time - get raise/fall time
2547 * @regulator: regulator source
2548 * @old_uV: starting voltage in microvolts
2549 * @new_uV: target voltage in microvolts
2551 * Provided with the starting and ending voltage, this function attempts to
2552 * calculate the time in microseconds required to rise or fall to this new
2555 int regulator_set_voltage_time(struct regulator *regulator,
2556 int old_uV, int new_uV)
2558 struct regulator_dev *rdev = regulator->rdev;
2559 struct regulator_ops *ops = rdev->desc->ops;
2565 /* Currently requires operations to do this */
2566 if (!ops->list_voltage || !ops->set_voltage_time_sel
2567 || !rdev->desc->n_voltages)
2570 for (i = 0; i < rdev->desc->n_voltages; i++) {
2571 /* We only look for exact voltage matches here */
2572 voltage = regulator_list_voltage(regulator, i);
2577 if (voltage == old_uV)
2579 if (voltage == new_uV)
2583 if (old_sel < 0 || new_sel < 0)
2586 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2588 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2591 * regulator_set_voltage_time_sel - get raise/fall time
2592 * @rdev: regulator source device
2593 * @old_selector: selector for starting voltage
2594 * @new_selector: selector for target voltage
2596 * Provided with the starting and target voltage selectors, this function
2597 * returns time in microseconds required to rise or fall to this new voltage
2599 * Drivers providing ramp_delay in regulation_constraints can use this as their
2600 * set_voltage_time_sel() operation.
2602 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2603 unsigned int old_selector,
2604 unsigned int new_selector)
2606 unsigned int ramp_delay = 0;
2607 int old_volt, new_volt;
2609 if (rdev->constraints->ramp_delay)
2610 ramp_delay = rdev->constraints->ramp_delay;
2611 else if (rdev->desc->ramp_delay)
2612 ramp_delay = rdev->desc->ramp_delay;
2614 if (ramp_delay == 0) {
2615 rdev_warn(rdev, "ramp_delay not set\n");
2620 if (!rdev->desc->ops->list_voltage)
2623 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2624 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2626 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2628 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2631 * regulator_sync_voltage - re-apply last regulator output voltage
2632 * @regulator: regulator source
2634 * Re-apply the last configured voltage. This is intended to be used
2635 * where some external control source the consumer is cooperating with
2636 * has caused the configured voltage to change.
2638 int regulator_sync_voltage(struct regulator *regulator)
2640 struct regulator_dev *rdev = regulator->rdev;
2641 int ret, min_uV, max_uV;
2643 mutex_lock(&rdev->mutex);
2645 if (!rdev->desc->ops->set_voltage &&
2646 !rdev->desc->ops->set_voltage_sel) {
2651 /* This is only going to work if we've had a voltage configured. */
2652 if (!regulator->min_uV && !regulator->max_uV) {
2657 min_uV = regulator->min_uV;
2658 max_uV = regulator->max_uV;
2660 /* This should be a paranoia check... */
2661 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2665 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2669 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2672 mutex_unlock(&rdev->mutex);
2675 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2677 static int _regulator_get_voltage(struct regulator_dev *rdev)
2681 if (rdev->desc->ops->get_voltage_sel) {
2682 sel = rdev->desc->ops->get_voltage_sel(rdev);
2685 ret = rdev->desc->ops->list_voltage(rdev, sel);
2686 } else if (rdev->desc->ops->get_voltage) {
2687 ret = rdev->desc->ops->get_voltage(rdev);
2688 } else if (rdev->desc->ops->list_voltage) {
2689 ret = rdev->desc->ops->list_voltage(rdev, 0);
2690 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2691 ret = rdev->desc->fixed_uV;
2698 return ret - rdev->constraints->uV_offset;
2702 * regulator_get_voltage - get regulator output voltage
2703 * @regulator: regulator source
2705 * This returns the current regulator voltage in uV.
2707 * NOTE: If the regulator is disabled it will return the voltage value. This
2708 * function should not be used to determine regulator state.
2710 int regulator_get_voltage(struct regulator *regulator)
2714 mutex_lock(®ulator->rdev->mutex);
2716 ret = _regulator_get_voltage(regulator->rdev);
2718 mutex_unlock(®ulator->rdev->mutex);
2722 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2725 * regulator_set_current_limit - set regulator output current limit
2726 * @regulator: regulator source
2727 * @min_uA: Minimum supported current in uA
2728 * @max_uA: Maximum supported current in uA
2730 * Sets current sink to the desired output current. This can be set during
2731 * any regulator state. IOW, regulator can be disabled or enabled.
2733 * If the regulator is enabled then the current will change to the new value
2734 * immediately otherwise if the regulator is disabled the regulator will
2735 * output at the new current when enabled.
2737 * NOTE: Regulator system constraints must be set for this regulator before
2738 * calling this function otherwise this call will fail.
2740 int regulator_set_current_limit(struct regulator *regulator,
2741 int min_uA, int max_uA)
2743 struct regulator_dev *rdev = regulator->rdev;
2746 mutex_lock(&rdev->mutex);
2749 if (!rdev->desc->ops->set_current_limit) {
2754 /* constraints check */
2755 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2759 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2761 mutex_unlock(&rdev->mutex);
2764 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2766 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2770 mutex_lock(&rdev->mutex);
2773 if (!rdev->desc->ops->get_current_limit) {
2778 ret = rdev->desc->ops->get_current_limit(rdev);
2780 mutex_unlock(&rdev->mutex);
2785 * regulator_get_current_limit - get regulator output current
2786 * @regulator: regulator source
2788 * This returns the current supplied by the specified current sink in uA.
2790 * NOTE: If the regulator is disabled it will return the current value. This
2791 * function should not be used to determine regulator state.
2793 int regulator_get_current_limit(struct regulator *regulator)
2795 return _regulator_get_current_limit(regulator->rdev);
2797 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2800 * regulator_set_mode - set regulator operating mode
2801 * @regulator: regulator source
2802 * @mode: operating mode - one of the REGULATOR_MODE constants
2804 * Set regulator operating mode to increase regulator efficiency or improve
2805 * regulation performance.
2807 * NOTE: Regulator system constraints must be set for this regulator before
2808 * calling this function otherwise this call will fail.
2810 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2812 struct regulator_dev *rdev = regulator->rdev;
2814 int regulator_curr_mode;
2816 mutex_lock(&rdev->mutex);
2819 if (!rdev->desc->ops->set_mode) {
2824 /* return if the same mode is requested */
2825 if (rdev->desc->ops->get_mode) {
2826 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2827 if (regulator_curr_mode == mode) {
2833 /* constraints check */
2834 ret = regulator_mode_constrain(rdev, &mode);
2838 ret = rdev->desc->ops->set_mode(rdev, mode);
2840 mutex_unlock(&rdev->mutex);
2843 EXPORT_SYMBOL_GPL(regulator_set_mode);
2845 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2849 mutex_lock(&rdev->mutex);
2852 if (!rdev->desc->ops->get_mode) {
2857 ret = rdev->desc->ops->get_mode(rdev);
2859 mutex_unlock(&rdev->mutex);
2864 * regulator_get_mode - get regulator operating mode
2865 * @regulator: regulator source
2867 * Get the current regulator operating mode.
2869 unsigned int regulator_get_mode(struct regulator *regulator)
2871 return _regulator_get_mode(regulator->rdev);
2873 EXPORT_SYMBOL_GPL(regulator_get_mode);
2876 * regulator_set_optimum_mode - set regulator optimum operating mode
2877 * @regulator: regulator source
2878 * @uA_load: load current
2880 * Notifies the regulator core of a new device load. This is then used by
2881 * DRMS (if enabled by constraints) to set the most efficient regulator
2882 * operating mode for the new regulator loading.
2884 * Consumer devices notify their supply regulator of the maximum power
2885 * they will require (can be taken from device datasheet in the power
2886 * consumption tables) when they change operational status and hence power
2887 * state. Examples of operational state changes that can affect power
2888 * consumption are :-
2890 * o Device is opened / closed.
2891 * o Device I/O is about to begin or has just finished.
2892 * o Device is idling in between work.
2894 * This information is also exported via sysfs to userspace.
2896 * DRMS will sum the total requested load on the regulator and change
2897 * to the most efficient operating mode if platform constraints allow.
2899 * Returns the new regulator mode or error.
2901 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2903 struct regulator_dev *rdev = regulator->rdev;
2904 struct regulator *consumer;
2905 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2909 input_uV = regulator_get_voltage(rdev->supply);
2911 mutex_lock(&rdev->mutex);
2914 * first check to see if we can set modes at all, otherwise just
2915 * tell the consumer everything is OK.
2917 regulator->uA_load = uA_load;
2918 ret = regulator_check_drms(rdev);
2924 if (!rdev->desc->ops->get_optimum_mode)
2928 * we can actually do this so any errors are indicators of
2929 * potential real failure.
2933 if (!rdev->desc->ops->set_mode)
2936 /* get output voltage */
2937 output_uV = _regulator_get_voltage(rdev);
2938 if (output_uV <= 0) {
2939 rdev_err(rdev, "invalid output voltage found\n");
2943 /* No supply? Use constraint voltage */
2945 input_uV = rdev->constraints->input_uV;
2946 if (input_uV <= 0) {
2947 rdev_err(rdev, "invalid input voltage found\n");
2951 /* calc total requested load for this regulator */
2952 list_for_each_entry(consumer, &rdev->consumer_list, list)
2953 total_uA_load += consumer->uA_load;
2955 mode = rdev->desc->ops->get_optimum_mode(rdev,
2956 input_uV, output_uV,
2958 ret = regulator_mode_constrain(rdev, &mode);
2960 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2961 total_uA_load, input_uV, output_uV);
2965 ret = rdev->desc->ops->set_mode(rdev, mode);
2967 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2972 mutex_unlock(&rdev->mutex);
2975 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2978 * regulator_allow_bypass - allow the regulator to go into bypass mode
2980 * @regulator: Regulator to configure
2981 * @enable: enable or disable bypass mode
2983 * Allow the regulator to go into bypass mode if all other consumers
2984 * for the regulator also enable bypass mode and the machine
2985 * constraints allow this. Bypass mode means that the regulator is
2986 * simply passing the input directly to the output with no regulation.
2988 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2990 struct regulator_dev *rdev = regulator->rdev;
2993 if (!rdev->desc->ops->set_bypass)
2996 if (rdev->constraints &&
2997 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3000 mutex_lock(&rdev->mutex);
3002 if (enable && !regulator->bypass) {
3003 rdev->bypass_count++;
3005 if (rdev->bypass_count == rdev->open_count) {
3006 ret = rdev->desc->ops->set_bypass(rdev, enable);
3008 rdev->bypass_count--;
3011 } else if (!enable && regulator->bypass) {
3012 rdev->bypass_count--;
3014 if (rdev->bypass_count != rdev->open_count) {
3015 ret = rdev->desc->ops->set_bypass(rdev, enable);
3017 rdev->bypass_count++;
3022 regulator->bypass = enable;
3024 mutex_unlock(&rdev->mutex);
3028 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3031 * regulator_register_notifier - register regulator event notifier
3032 * @regulator: regulator source
3033 * @nb: notifier block
3035 * Register notifier block to receive regulator events.
3037 int regulator_register_notifier(struct regulator *regulator,
3038 struct notifier_block *nb)
3040 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3043 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3046 * regulator_unregister_notifier - unregister regulator event notifier
3047 * @regulator: regulator source
3048 * @nb: notifier block
3050 * Unregister regulator event notifier block.
3052 int regulator_unregister_notifier(struct regulator *regulator,
3053 struct notifier_block *nb)
3055 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3058 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3060 /* notify regulator consumers and downstream regulator consumers.
3061 * Note mutex must be held by caller.
3063 static void _notifier_call_chain(struct regulator_dev *rdev,
3064 unsigned long event, void *data)
3066 /* call rdev chain first */
3067 blocking_notifier_call_chain(&rdev->notifier, event, data);
3071 * regulator_bulk_get - get multiple regulator consumers
3073 * @dev: Device to supply
3074 * @num_consumers: Number of consumers to register
3075 * @consumers: Configuration of consumers; clients are stored here.
3077 * @return 0 on success, an errno on failure.
3079 * This helper function allows drivers to get several regulator
3080 * consumers in one operation. If any of the regulators cannot be
3081 * acquired then any regulators that were allocated will be freed
3082 * before returning to the caller.
3084 int regulator_bulk_get(struct device *dev, int num_consumers,
3085 struct regulator_bulk_data *consumers)
3090 for (i = 0; i < num_consumers; i++)
3091 consumers[i].consumer = NULL;
3093 for (i = 0; i < num_consumers; i++) {
3094 consumers[i].consumer = regulator_get(dev,
3095 consumers[i].supply);
3096 if (IS_ERR(consumers[i].consumer)) {
3097 ret = PTR_ERR(consumers[i].consumer);
3098 dev_err(dev, "Failed to get supply '%s': %d\n",
3099 consumers[i].supply, ret);
3100 consumers[i].consumer = NULL;
3109 regulator_put(consumers[i].consumer);
3113 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3115 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3117 struct regulator_bulk_data *bulk = data;
3119 bulk->ret = regulator_enable(bulk->consumer);
3123 * regulator_bulk_enable - enable multiple regulator consumers
3125 * @num_consumers: Number of consumers
3126 * @consumers: Consumer data; clients are stored here.
3127 * @return 0 on success, an errno on failure
3129 * This convenience API allows consumers to enable multiple regulator
3130 * clients in a single API call. If any consumers cannot be enabled
3131 * then any others that were enabled will be disabled again prior to
3134 int regulator_bulk_enable(int num_consumers,
3135 struct regulator_bulk_data *consumers)
3137 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3141 for (i = 0; i < num_consumers; i++) {
3142 if (consumers[i].consumer->always_on)
3143 consumers[i].ret = 0;
3145 async_schedule_domain(regulator_bulk_enable_async,
3146 &consumers[i], &async_domain);
3149 async_synchronize_full_domain(&async_domain);
3151 /* If any consumer failed we need to unwind any that succeeded */
3152 for (i = 0; i < num_consumers; i++) {
3153 if (consumers[i].ret != 0) {
3154 ret = consumers[i].ret;
3162 for (i = 0; i < num_consumers; i++) {
3163 if (consumers[i].ret < 0)
3164 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3167 regulator_disable(consumers[i].consumer);
3172 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3175 * regulator_bulk_disable - disable multiple regulator consumers
3177 * @num_consumers: Number of consumers
3178 * @consumers: Consumer data; clients are stored here.
3179 * @return 0 on success, an errno on failure
3181 * This convenience API allows consumers to disable multiple regulator
3182 * clients in a single API call. If any consumers cannot be disabled
3183 * then any others that were disabled will be enabled again prior to
3186 int regulator_bulk_disable(int num_consumers,
3187 struct regulator_bulk_data *consumers)
3192 for (i = num_consumers - 1; i >= 0; --i) {
3193 ret = regulator_disable(consumers[i].consumer);
3201 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3202 for (++i; i < num_consumers; ++i) {
3203 r = regulator_enable(consumers[i].consumer);
3205 pr_err("Failed to reename %s: %d\n",
3206 consumers[i].supply, r);
3211 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3214 * regulator_bulk_force_disable - force disable multiple regulator consumers
3216 * @num_consumers: Number of consumers
3217 * @consumers: Consumer data; clients are stored here.
3218 * @return 0 on success, an errno on failure
3220 * This convenience API allows consumers to forcibly disable multiple regulator
3221 * clients in a single API call.
3222 * NOTE: This should be used for situations when device damage will
3223 * likely occur if the regulators are not disabled (e.g. over temp).
3224 * Although regulator_force_disable function call for some consumers can
3225 * return error numbers, the function is called for all consumers.
3227 int regulator_bulk_force_disable(int num_consumers,
3228 struct regulator_bulk_data *consumers)
3233 for (i = 0; i < num_consumers; i++)
3235 regulator_force_disable(consumers[i].consumer);
3237 for (i = 0; i < num_consumers; i++) {
3238 if (consumers[i].ret != 0) {
3239 ret = consumers[i].ret;
3248 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3251 * regulator_bulk_free - free multiple regulator consumers
3253 * @num_consumers: Number of consumers
3254 * @consumers: Consumer data; clients are stored here.
3256 * This convenience API allows consumers to free multiple regulator
3257 * clients in a single API call.
3259 void regulator_bulk_free(int num_consumers,
3260 struct regulator_bulk_data *consumers)
3264 for (i = 0; i < num_consumers; i++) {
3265 regulator_put(consumers[i].consumer);
3266 consumers[i].consumer = NULL;
3269 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3272 * regulator_notifier_call_chain - call regulator event notifier
3273 * @rdev: regulator source
3274 * @event: notifier block
3275 * @data: callback-specific data.
3277 * Called by regulator drivers to notify clients a regulator event has
3278 * occurred. We also notify regulator clients downstream.
3279 * Note lock must be held by caller.
3281 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3282 unsigned long event, void *data)
3284 _notifier_call_chain(rdev, event, data);
3288 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3291 * regulator_mode_to_status - convert a regulator mode into a status
3293 * @mode: Mode to convert
3295 * Convert a regulator mode into a status.
3297 int regulator_mode_to_status(unsigned int mode)
3300 case REGULATOR_MODE_FAST:
3301 return REGULATOR_STATUS_FAST;
3302 case REGULATOR_MODE_NORMAL:
3303 return REGULATOR_STATUS_NORMAL;
3304 case REGULATOR_MODE_IDLE:
3305 return REGULATOR_STATUS_IDLE;
3306 case REGULATOR_MODE_STANDBY:
3307 return REGULATOR_STATUS_STANDBY;
3309 return REGULATOR_STATUS_UNDEFINED;
3312 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3315 * To avoid cluttering sysfs (and memory) with useless state, only
3316 * create attributes that can be meaningfully displayed.
3318 static int add_regulator_attributes(struct regulator_dev *rdev)
3320 struct device *dev = &rdev->dev;
3321 struct regulator_ops *ops = rdev->desc->ops;
3324 /* some attributes need specific methods to be displayed */
3325 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3326 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3327 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3328 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3329 status = device_create_file(dev, &dev_attr_microvolts);
3333 if (ops->get_current_limit) {
3334 status = device_create_file(dev, &dev_attr_microamps);
3338 if (ops->get_mode) {
3339 status = device_create_file(dev, &dev_attr_opmode);
3343 if (rdev->ena_pin || ops->is_enabled) {
3344 status = device_create_file(dev, &dev_attr_state);
3348 if (ops->get_status) {
3349 status = device_create_file(dev, &dev_attr_status);
3353 if (ops->get_bypass) {
3354 status = device_create_file(dev, &dev_attr_bypass);
3359 /* some attributes are type-specific */
3360 if (rdev->desc->type == REGULATOR_CURRENT) {
3361 status = device_create_file(dev, &dev_attr_requested_microamps);
3366 /* all the other attributes exist to support constraints;
3367 * don't show them if there are no constraints, or if the
3368 * relevant supporting methods are missing.
3370 if (!rdev->constraints)
3373 /* constraints need specific supporting methods */
3374 if (ops->set_voltage || ops->set_voltage_sel) {
3375 status = device_create_file(dev, &dev_attr_min_microvolts);
3378 status = device_create_file(dev, &dev_attr_max_microvolts);
3382 if (ops->set_current_limit) {
3383 status = device_create_file(dev, &dev_attr_min_microamps);
3386 status = device_create_file(dev, &dev_attr_max_microamps);
3391 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3394 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3397 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3401 if (ops->set_suspend_voltage) {
3402 status = device_create_file(dev,
3403 &dev_attr_suspend_standby_microvolts);
3406 status = device_create_file(dev,
3407 &dev_attr_suspend_mem_microvolts);
3410 status = device_create_file(dev,
3411 &dev_attr_suspend_disk_microvolts);
3416 if (ops->set_suspend_mode) {
3417 status = device_create_file(dev,
3418 &dev_attr_suspend_standby_mode);
3421 status = device_create_file(dev,
3422 &dev_attr_suspend_mem_mode);
3425 status = device_create_file(dev,
3426 &dev_attr_suspend_disk_mode);
3434 static void rdev_init_debugfs(struct regulator_dev *rdev)
3436 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3437 if (!rdev->debugfs) {
3438 rdev_warn(rdev, "Failed to create debugfs directory\n");
3442 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3444 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3446 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3447 &rdev->bypass_count);
3451 * regulator_register - register regulator
3452 * @regulator_desc: regulator to register
3453 * @config: runtime configuration for regulator
3455 * Called by regulator drivers to register a regulator.
3456 * Returns a valid pointer to struct regulator_dev on success
3457 * or an ERR_PTR() on error.
3459 struct regulator_dev *
3460 regulator_register(const struct regulator_desc *regulator_desc,
3461 const struct regulator_config *config)
3463 const struct regulation_constraints *constraints = NULL;
3464 const struct regulator_init_data *init_data;
3465 static atomic_t regulator_no = ATOMIC_INIT(0);
3466 struct regulator_dev *rdev;
3469 const char *supply = NULL;
3471 if (regulator_desc == NULL || config == NULL)
3472 return ERR_PTR(-EINVAL);
3477 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3478 return ERR_PTR(-EINVAL);
3480 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3481 regulator_desc->type != REGULATOR_CURRENT)
3482 return ERR_PTR(-EINVAL);
3484 /* Only one of each should be implemented */
3485 WARN_ON(regulator_desc->ops->get_voltage &&
3486 regulator_desc->ops->get_voltage_sel);
3487 WARN_ON(regulator_desc->ops->set_voltage &&
3488 regulator_desc->ops->set_voltage_sel);
3490 /* If we're using selectors we must implement list_voltage. */
3491 if (regulator_desc->ops->get_voltage_sel &&
3492 !regulator_desc->ops->list_voltage) {
3493 return ERR_PTR(-EINVAL);
3495 if (regulator_desc->ops->set_voltage_sel &&
3496 !regulator_desc->ops->list_voltage) {
3497 return ERR_PTR(-EINVAL);
3500 init_data = config->init_data;
3502 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3504 return ERR_PTR(-ENOMEM);
3506 mutex_lock(®ulator_list_mutex);
3508 mutex_init(&rdev->mutex);
3509 rdev->reg_data = config->driver_data;
3510 rdev->owner = regulator_desc->owner;
3511 rdev->desc = regulator_desc;
3513 rdev->regmap = config->regmap;
3514 else if (dev_get_regmap(dev, NULL))
3515 rdev->regmap = dev_get_regmap(dev, NULL);
3516 else if (dev->parent)
3517 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3518 INIT_LIST_HEAD(&rdev->consumer_list);
3519 INIT_LIST_HEAD(&rdev->list);
3520 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3521 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3523 /* preform any regulator specific init */
3524 if (init_data && init_data->regulator_init) {
3525 ret = init_data->regulator_init(rdev->reg_data);
3530 /* register with sysfs */
3531 rdev->dev.class = ®ulator_class;
3532 rdev->dev.of_node = of_node_get(config->of_node);
3533 rdev->dev.parent = dev;
3534 dev_set_name(&rdev->dev, "regulator.%d",
3535 atomic_inc_return(®ulator_no) - 1);
3536 ret = device_register(&rdev->dev);
3538 put_device(&rdev->dev);
3542 dev_set_drvdata(&rdev->dev, rdev);
3544 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3545 ret = regulator_ena_gpio_request(rdev, config);
3547 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3548 config->ena_gpio, ret);
3552 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3553 rdev->ena_gpio_state = 1;
3555 if (config->ena_gpio_invert)
3556 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3559 /* set regulator constraints */
3561 constraints = &init_data->constraints;
3563 ret = set_machine_constraints(rdev, constraints);
3567 /* add attributes supported by this regulator */
3568 ret = add_regulator_attributes(rdev);
3572 if (init_data && init_data->supply_regulator)
3573 supply = init_data->supply_regulator;
3574 else if (regulator_desc->supply_name)
3575 supply = regulator_desc->supply_name;
3578 struct regulator_dev *r;
3580 r = regulator_dev_lookup(dev, supply, &ret);
3582 if (ret == -ENODEV) {
3584 * No supply was specified for this regulator and
3585 * there will never be one.
3590 dev_err(dev, "Failed to find supply %s\n", supply);
3591 ret = -EPROBE_DEFER;
3595 ret = set_supply(rdev, r);
3599 /* Enable supply if rail is enabled */
3600 if (_regulator_is_enabled(rdev)) {
3601 ret = regulator_enable(rdev->supply);
3608 /* add consumers devices */
3610 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3611 ret = set_consumer_device_supply(rdev,
3612 init_data->consumer_supplies[i].dev_name,
3613 init_data->consumer_supplies[i].supply);
3615 dev_err(dev, "Failed to set supply %s\n",
3616 init_data->consumer_supplies[i].supply);
3617 goto unset_supplies;
3622 list_add(&rdev->list, ®ulator_list);
3624 rdev_init_debugfs(rdev);
3626 mutex_unlock(®ulator_list_mutex);
3630 unset_regulator_supplies(rdev);
3634 _regulator_put(rdev->supply);
3635 regulator_ena_gpio_free(rdev);
3636 kfree(rdev->constraints);
3638 device_unregister(&rdev->dev);
3639 /* device core frees rdev */
3640 rdev = ERR_PTR(ret);
3645 rdev = ERR_PTR(ret);
3648 EXPORT_SYMBOL_GPL(regulator_register);
3651 * regulator_unregister - unregister regulator
3652 * @rdev: regulator to unregister
3654 * Called by regulator drivers to unregister a regulator.
3656 void regulator_unregister(struct regulator_dev *rdev)
3662 while (rdev->use_count--)
3663 regulator_disable(rdev->supply);
3664 regulator_put(rdev->supply);
3666 mutex_lock(®ulator_list_mutex);
3667 debugfs_remove_recursive(rdev->debugfs);
3668 flush_work(&rdev->disable_work.work);
3669 WARN_ON(rdev->open_count);
3670 unset_regulator_supplies(rdev);
3671 list_del(&rdev->list);
3672 kfree(rdev->constraints);
3673 regulator_ena_gpio_free(rdev);
3674 of_node_put(rdev->dev.of_node);
3675 device_unregister(&rdev->dev);
3676 mutex_unlock(®ulator_list_mutex);
3678 EXPORT_SYMBOL_GPL(regulator_unregister);
3681 * regulator_suspend_prepare - prepare regulators for system wide suspend
3682 * @state: system suspend state
3684 * Configure each regulator with it's suspend operating parameters for state.
3685 * This will usually be called by machine suspend code prior to supending.
3687 int regulator_suspend_prepare(suspend_state_t state)
3689 struct regulator_dev *rdev;
3692 /* ON is handled by regulator active state */
3693 if (state == PM_SUSPEND_ON)
3696 mutex_lock(®ulator_list_mutex);
3697 list_for_each_entry(rdev, ®ulator_list, list) {
3699 mutex_lock(&rdev->mutex);
3700 ret = suspend_prepare(rdev, state);
3701 mutex_unlock(&rdev->mutex);
3704 rdev_err(rdev, "failed to prepare\n");
3709 mutex_unlock(®ulator_list_mutex);
3712 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3715 * regulator_suspend_finish - resume regulators from system wide suspend
3717 * Turn on regulators that might be turned off by regulator_suspend_prepare
3718 * and that should be turned on according to the regulators properties.
3720 int regulator_suspend_finish(void)
3722 struct regulator_dev *rdev;
3725 mutex_lock(®ulator_list_mutex);
3726 list_for_each_entry(rdev, ®ulator_list, list) {
3727 mutex_lock(&rdev->mutex);
3728 if (rdev->use_count > 0 || rdev->constraints->always_on) {
3729 error = _regulator_do_enable(rdev);
3733 if (!have_full_constraints())
3735 if (!_regulator_is_enabled(rdev))
3738 error = _regulator_do_disable(rdev);
3743 mutex_unlock(&rdev->mutex);
3745 mutex_unlock(®ulator_list_mutex);
3748 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3751 * regulator_has_full_constraints - the system has fully specified constraints
3753 * Calling this function will cause the regulator API to disable all
3754 * regulators which have a zero use count and don't have an always_on
3755 * constraint in a late_initcall.
3757 * The intention is that this will become the default behaviour in a
3758 * future kernel release so users are encouraged to use this facility
3761 void regulator_has_full_constraints(void)
3763 has_full_constraints = 1;
3765 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3768 * rdev_get_drvdata - get rdev regulator driver data
3771 * Get rdev regulator driver private data. This call can be used in the
3772 * regulator driver context.
3774 void *rdev_get_drvdata(struct regulator_dev *rdev)
3776 return rdev->reg_data;
3778 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3781 * regulator_get_drvdata - get regulator driver data
3782 * @regulator: regulator
3784 * Get regulator driver private data. This call can be used in the consumer
3785 * driver context when non API regulator specific functions need to be called.
3787 void *regulator_get_drvdata(struct regulator *regulator)
3789 return regulator->rdev->reg_data;
3791 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3794 * regulator_set_drvdata - set regulator driver data
3795 * @regulator: regulator
3798 void regulator_set_drvdata(struct regulator *regulator, void *data)
3800 regulator->rdev->reg_data = data;
3802 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3805 * regulator_get_id - get regulator ID
3808 int rdev_get_id(struct regulator_dev *rdev)
3810 return rdev->desc->id;
3812 EXPORT_SYMBOL_GPL(rdev_get_id);
3814 struct device *rdev_get_dev(struct regulator_dev *rdev)
3818 EXPORT_SYMBOL_GPL(rdev_get_dev);
3820 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3822 return reg_init_data->driver_data;
3824 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3826 #ifdef CONFIG_DEBUG_FS
3827 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3828 size_t count, loff_t *ppos)
3830 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3831 ssize_t len, ret = 0;
3832 struct regulator_map *map;
3837 list_for_each_entry(map, ®ulator_map_list, list) {
3838 len = snprintf(buf + ret, PAGE_SIZE - ret,
3840 rdev_get_name(map->regulator), map->dev_name,
3844 if (ret > PAGE_SIZE) {
3850 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3858 static const struct file_operations supply_map_fops = {
3859 #ifdef CONFIG_DEBUG_FS
3860 .read = supply_map_read_file,
3861 .llseek = default_llseek,
3865 static int __init regulator_init(void)
3869 ret = class_register(®ulator_class);
3871 debugfs_root = debugfs_create_dir("regulator", NULL);
3873 pr_warn("regulator: Failed to create debugfs directory\n");
3875 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3878 regulator_dummy_init();
3883 /* init early to allow our consumers to complete system booting */
3884 core_initcall(regulator_init);
3886 static int __init regulator_init_complete(void)
3888 struct regulator_dev *rdev;
3889 struct regulator_ops *ops;
3890 struct regulation_constraints *c;
3894 * Since DT doesn't provide an idiomatic mechanism for
3895 * enabling full constraints and since it's much more natural
3896 * with DT to provide them just assume that a DT enabled
3897 * system has full constraints.
3899 if (of_have_populated_dt())
3900 has_full_constraints = true;
3902 mutex_lock(®ulator_list_mutex);
3904 /* If we have a full configuration then disable any regulators
3905 * we have permission to change the status for and which are
3906 * not in use or always_on. This is effectively the default
3907 * for DT and ACPI as they have full constraints.
3909 list_for_each_entry(rdev, ®ulator_list, list) {
3910 ops = rdev->desc->ops;
3911 c = rdev->constraints;
3913 if (c && c->always_on)
3916 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
3919 mutex_lock(&rdev->mutex);
3921 if (rdev->use_count)
3924 /* If we can't read the status assume it's on. */
3925 if (ops->is_enabled)
3926 enabled = ops->is_enabled(rdev);
3933 if (have_full_constraints()) {
3934 /* We log since this may kill the system if it
3936 rdev_info(rdev, "disabling\n");
3937 ret = _regulator_do_disable(rdev);
3939 rdev_err(rdev, "couldn't disable: %d\n", ret);
3941 /* The intention is that in future we will
3942 * assume that full constraints are provided
3943 * so warn even if we aren't going to do
3946 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3950 mutex_unlock(&rdev->mutex);
3953 mutex_unlock(®ulator_list_mutex);
3957 late_initcall_sync(regulator_init_complete);