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 ret = _regulator_do_set_voltage(rdev,
848 rdev->constraints->min_uV,
849 rdev->constraints->max_uV);
851 rdev_err(rdev, "failed to apply %duV constraint\n",
852 rdev->constraints->min_uV);
857 /* constrain machine-level voltage specs to fit
858 * the actual range supported by this regulator.
860 if (ops->list_voltage && rdev->desc->n_voltages) {
861 int count = rdev->desc->n_voltages;
863 int min_uV = INT_MAX;
864 int max_uV = INT_MIN;
865 int cmin = constraints->min_uV;
866 int cmax = constraints->max_uV;
868 /* it's safe to autoconfigure fixed-voltage supplies
869 and the constraints are used by list_voltage. */
870 if (count == 1 && !cmin) {
873 constraints->min_uV = cmin;
874 constraints->max_uV = cmax;
877 /* voltage constraints are optional */
878 if ((cmin == 0) && (cmax == 0))
881 /* else require explicit machine-level constraints */
882 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
883 rdev_err(rdev, "invalid voltage constraints\n");
887 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
888 for (i = 0; i < count; i++) {
891 value = ops->list_voltage(rdev, i);
895 /* maybe adjust [min_uV..max_uV] */
896 if (value >= cmin && value < min_uV)
898 if (value <= cmax && value > max_uV)
902 /* final: [min_uV..max_uV] valid iff constraints valid */
903 if (max_uV < min_uV) {
905 "unsupportable voltage constraints %u-%uuV\n",
910 /* use regulator's subset of machine constraints */
911 if (constraints->min_uV < min_uV) {
912 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
913 constraints->min_uV, min_uV);
914 constraints->min_uV = min_uV;
916 if (constraints->max_uV > max_uV) {
917 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
918 constraints->max_uV, max_uV);
919 constraints->max_uV = max_uV;
926 static int machine_constraints_current(struct regulator_dev *rdev,
927 struct regulation_constraints *constraints)
929 struct regulator_ops *ops = rdev->desc->ops;
932 if (!constraints->min_uA && !constraints->max_uA)
935 if (constraints->min_uA > constraints->max_uA) {
936 rdev_err(rdev, "Invalid current constraints\n");
940 if (!ops->set_current_limit || !ops->get_current_limit) {
941 rdev_warn(rdev, "Operation of current configuration missing\n");
945 /* Set regulator current in constraints range */
946 ret = ops->set_current_limit(rdev, constraints->min_uA,
947 constraints->max_uA);
949 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
956 static int _regulator_do_enable(struct regulator_dev *rdev);
959 * set_machine_constraints - sets regulator constraints
960 * @rdev: regulator source
961 * @constraints: constraints to apply
963 * Allows platform initialisation code to define and constrain
964 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
965 * Constraints *must* be set by platform code in order for some
966 * regulator operations to proceed i.e. set_voltage, set_current_limit,
969 static int set_machine_constraints(struct regulator_dev *rdev,
970 const struct regulation_constraints *constraints)
973 struct regulator_ops *ops = rdev->desc->ops;
976 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
979 rdev->constraints = kzalloc(sizeof(*constraints),
981 if (!rdev->constraints)
984 ret = machine_constraints_voltage(rdev, rdev->constraints);
988 ret = machine_constraints_current(rdev, rdev->constraints);
992 /* do we need to setup our suspend state */
993 if (rdev->constraints->initial_state) {
994 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
996 rdev_err(rdev, "failed to set suspend state\n");
1001 if (rdev->constraints->initial_mode) {
1002 if (!ops->set_mode) {
1003 rdev_err(rdev, "no set_mode operation\n");
1008 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1010 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1015 /* If the constraints say the regulator should be on at this point
1016 * and we have control then make sure it is enabled.
1018 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1019 ret = _regulator_do_enable(rdev);
1020 if (ret < 0 && ret != -EINVAL) {
1021 rdev_err(rdev, "failed to enable\n");
1026 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1027 && ops->set_ramp_delay) {
1028 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1030 rdev_err(rdev, "failed to set ramp_delay\n");
1035 print_constraints(rdev);
1038 kfree(rdev->constraints);
1039 rdev->constraints = NULL;
1044 * set_supply - set regulator supply regulator
1045 * @rdev: regulator name
1046 * @supply_rdev: supply regulator name
1048 * Called by platform initialisation code to set the supply regulator for this
1049 * regulator. This ensures that a regulators supply will also be enabled by the
1050 * core if it's child is enabled.
1052 static int set_supply(struct regulator_dev *rdev,
1053 struct regulator_dev *supply_rdev)
1057 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1059 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1060 if (rdev->supply == NULL) {
1064 supply_rdev->open_count++;
1070 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1071 * @rdev: regulator source
1072 * @consumer_dev_name: dev_name() string for device supply applies to
1073 * @supply: symbolic name for supply
1075 * Allows platform initialisation code to map physical regulator
1076 * sources to symbolic names for supplies for use by devices. Devices
1077 * should use these symbolic names to request regulators, avoiding the
1078 * need to provide board-specific regulator names as platform data.
1080 static int set_consumer_device_supply(struct regulator_dev *rdev,
1081 const char *consumer_dev_name,
1084 struct regulator_map *node;
1090 if (consumer_dev_name != NULL)
1095 list_for_each_entry(node, ®ulator_map_list, list) {
1096 if (node->dev_name && consumer_dev_name) {
1097 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1099 } else if (node->dev_name || consumer_dev_name) {
1103 if (strcmp(node->supply, supply) != 0)
1106 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1108 dev_name(&node->regulator->dev),
1109 node->regulator->desc->name,
1111 dev_name(&rdev->dev), rdev_get_name(rdev));
1115 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1119 node->regulator = rdev;
1120 node->supply = supply;
1123 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1124 if (node->dev_name == NULL) {
1130 list_add(&node->list, ®ulator_map_list);
1134 static void unset_regulator_supplies(struct regulator_dev *rdev)
1136 struct regulator_map *node, *n;
1138 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1139 if (rdev == node->regulator) {
1140 list_del(&node->list);
1141 kfree(node->dev_name);
1147 #define REG_STR_SIZE 64
1149 static struct regulator *create_regulator(struct regulator_dev *rdev,
1151 const char *supply_name)
1153 struct regulator *regulator;
1154 char buf[REG_STR_SIZE];
1157 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1158 if (regulator == NULL)
1161 mutex_lock(&rdev->mutex);
1162 regulator->rdev = rdev;
1163 list_add(®ulator->list, &rdev->consumer_list);
1166 regulator->dev = dev;
1168 /* Add a link to the device sysfs entry */
1169 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1170 dev->kobj.name, supply_name);
1171 if (size >= REG_STR_SIZE)
1174 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1175 if (regulator->supply_name == NULL)
1178 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1181 rdev_warn(rdev, "could not add device link %s err %d\n",
1182 dev->kobj.name, err);
1186 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1187 if (regulator->supply_name == NULL)
1191 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1193 if (!regulator->debugfs) {
1194 rdev_warn(rdev, "Failed to create debugfs directory\n");
1196 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1197 ®ulator->uA_load);
1198 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1199 ®ulator->min_uV);
1200 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1201 ®ulator->max_uV);
1205 * Check now if the regulator is an always on regulator - if
1206 * it is then we don't need to do nearly so much work for
1207 * enable/disable calls.
1209 if (!_regulator_can_change_status(rdev) &&
1210 _regulator_is_enabled(rdev))
1211 regulator->always_on = true;
1213 mutex_unlock(&rdev->mutex);
1216 list_del(®ulator->list);
1218 mutex_unlock(&rdev->mutex);
1222 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1224 if (rdev->constraints && rdev->constraints->enable_time)
1225 return rdev->constraints->enable_time;
1226 if (!rdev->desc->ops->enable_time)
1227 return rdev->desc->enable_time;
1228 return rdev->desc->ops->enable_time(rdev);
1231 static struct regulator_supply_alias *regulator_find_supply_alias(
1232 struct device *dev, const char *supply)
1234 struct regulator_supply_alias *map;
1236 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1237 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1243 static void regulator_supply_alias(struct device **dev, const char **supply)
1245 struct regulator_supply_alias *map;
1247 map = regulator_find_supply_alias(*dev, *supply);
1249 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1250 *supply, map->alias_supply,
1251 dev_name(map->alias_dev));
1252 *dev = map->alias_dev;
1253 *supply = map->alias_supply;
1257 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1261 struct regulator_dev *r;
1262 struct device_node *node;
1263 struct regulator_map *map;
1264 const char *devname = NULL;
1266 regulator_supply_alias(&dev, &supply);
1268 /* first do a dt based lookup */
1269 if (dev && dev->of_node) {
1270 node = of_get_regulator(dev, supply);
1272 list_for_each_entry(r, ®ulator_list, list)
1273 if (r->dev.parent &&
1274 node == r->dev.of_node)
1278 * If we couldn't even get the node then it's
1279 * not just that the device didn't register
1280 * yet, there's no node and we'll never
1287 /* if not found, try doing it non-dt way */
1289 devname = dev_name(dev);
1291 list_for_each_entry(r, ®ulator_list, list)
1292 if (strcmp(rdev_get_name(r), supply) == 0)
1295 list_for_each_entry(map, ®ulator_map_list, list) {
1296 /* If the mapping has a device set up it must match */
1297 if (map->dev_name &&
1298 (!devname || strcmp(map->dev_name, devname)))
1301 if (strcmp(map->supply, supply) == 0)
1302 return map->regulator;
1309 /* Internal regulator request function */
1310 static struct regulator *_regulator_get(struct device *dev, const char *id,
1311 bool exclusive, bool allow_dummy)
1313 struct regulator_dev *rdev;
1314 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1315 const char *devname = NULL;
1316 int ret = -EPROBE_DEFER;
1319 pr_err("get() with no identifier\n");
1320 return ERR_PTR(-EINVAL);
1324 devname = dev_name(dev);
1326 mutex_lock(®ulator_list_mutex);
1328 rdev = regulator_dev_lookup(dev, id, &ret);
1332 regulator = ERR_PTR(ret);
1335 * If we have return value from dev_lookup fail, we do not expect to
1336 * succeed, so, quit with appropriate error value
1338 if (ret && ret != -ENODEV)
1342 devname = "deviceless";
1345 * Assume that a regulator is physically present and enabled
1346 * even if it isn't hooked up and just provide a dummy.
1348 if (have_full_constraints() && allow_dummy) {
1349 pr_warn("%s supply %s not found, using dummy regulator\n",
1352 rdev = dummy_regulator_rdev;
1354 /* Don't log an error when called from regulator_get_optional() */
1355 } else if (!have_full_constraints() || exclusive) {
1356 dev_warn(dev, "dummy supplies not allowed\n");
1359 mutex_unlock(®ulator_list_mutex);
1363 if (rdev->exclusive) {
1364 regulator = ERR_PTR(-EPERM);
1368 if (exclusive && rdev->open_count) {
1369 regulator = ERR_PTR(-EBUSY);
1373 if (!try_module_get(rdev->owner))
1376 regulator = create_regulator(rdev, dev, id);
1377 if (regulator == NULL) {
1378 regulator = ERR_PTR(-ENOMEM);
1379 module_put(rdev->owner);
1385 rdev->exclusive = 1;
1387 ret = _regulator_is_enabled(rdev);
1389 rdev->use_count = 1;
1391 rdev->use_count = 0;
1395 mutex_unlock(®ulator_list_mutex);
1401 * regulator_get - lookup and obtain a reference to a regulator.
1402 * @dev: device for regulator "consumer"
1403 * @id: Supply name or regulator ID.
1405 * Returns a struct regulator corresponding to the regulator producer,
1406 * or IS_ERR() condition containing errno.
1408 * Use of supply names configured via regulator_set_device_supply() is
1409 * strongly encouraged. It is recommended that the supply name used
1410 * should match the name used for the supply and/or the relevant
1411 * device pins in the datasheet.
1413 struct regulator *regulator_get(struct device *dev, const char *id)
1415 return _regulator_get(dev, id, false, true);
1417 EXPORT_SYMBOL_GPL(regulator_get);
1420 * regulator_get_exclusive - obtain exclusive access to a regulator.
1421 * @dev: device for regulator "consumer"
1422 * @id: Supply name or regulator ID.
1424 * Returns a struct regulator corresponding to the regulator producer,
1425 * or IS_ERR() condition containing errno. Other consumers will be
1426 * unable to obtain this reference is held and the use count for the
1427 * regulator will be initialised to reflect the current state of the
1430 * This is intended for use by consumers which cannot tolerate shared
1431 * use of the regulator such as those which need to force the
1432 * regulator off for correct operation of the hardware they are
1435 * Use of supply names configured via regulator_set_device_supply() is
1436 * strongly encouraged. It is recommended that the supply name used
1437 * should match the name used for the supply and/or the relevant
1438 * device pins in the datasheet.
1440 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1442 return _regulator_get(dev, id, true, false);
1444 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1447 * regulator_get_optional - obtain optional access to a regulator.
1448 * @dev: device for regulator "consumer"
1449 * @id: Supply name or regulator ID.
1451 * Returns a struct regulator corresponding to the regulator producer,
1452 * or IS_ERR() condition containing errno. Other consumers will be
1453 * unable to obtain this reference is held and the use count for the
1454 * regulator will be initialised to reflect the current state of the
1457 * This is intended for use by consumers for devices which can have
1458 * some supplies unconnected in normal use, such as some MMC devices.
1459 * It can allow the regulator core to provide stub supplies for other
1460 * supplies requested using normal regulator_get() calls without
1461 * disrupting the operation of drivers that can handle absent
1464 * Use of supply names configured via regulator_set_device_supply() is
1465 * strongly encouraged. It is recommended that the supply name used
1466 * should match the name used for the supply and/or the relevant
1467 * device pins in the datasheet.
1469 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1471 return _regulator_get(dev, id, false, false);
1473 EXPORT_SYMBOL_GPL(regulator_get_optional);
1475 /* Locks held by regulator_put() */
1476 static void _regulator_put(struct regulator *regulator)
1478 struct regulator_dev *rdev;
1480 if (regulator == NULL || IS_ERR(regulator))
1483 rdev = regulator->rdev;
1485 debugfs_remove_recursive(regulator->debugfs);
1487 /* remove any sysfs entries */
1489 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1490 kfree(regulator->supply_name);
1491 list_del(®ulator->list);
1495 rdev->exclusive = 0;
1497 module_put(rdev->owner);
1501 * regulator_put - "free" the regulator source
1502 * @regulator: regulator source
1504 * Note: drivers must ensure that all regulator_enable calls made on this
1505 * regulator source are balanced by regulator_disable calls prior to calling
1508 void regulator_put(struct regulator *regulator)
1510 mutex_lock(®ulator_list_mutex);
1511 _regulator_put(regulator);
1512 mutex_unlock(®ulator_list_mutex);
1514 EXPORT_SYMBOL_GPL(regulator_put);
1517 * regulator_register_supply_alias - Provide device alias for supply lookup
1519 * @dev: device that will be given as the regulator "consumer"
1520 * @id: Supply name or regulator ID
1521 * @alias_dev: device that should be used to lookup the supply
1522 * @alias_id: Supply name or regulator ID that should be used to lookup the
1525 * All lookups for id on dev will instead be conducted for alias_id on
1528 int regulator_register_supply_alias(struct device *dev, const char *id,
1529 struct device *alias_dev,
1530 const char *alias_id)
1532 struct regulator_supply_alias *map;
1534 map = regulator_find_supply_alias(dev, id);
1538 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1543 map->src_supply = id;
1544 map->alias_dev = alias_dev;
1545 map->alias_supply = alias_id;
1547 list_add(&map->list, ®ulator_supply_alias_list);
1549 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1550 id, dev_name(dev), alias_id, dev_name(alias_dev));
1554 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1557 * regulator_unregister_supply_alias - Remove device alias
1559 * @dev: device that will be given as the regulator "consumer"
1560 * @id: Supply name or regulator ID
1562 * Remove a lookup alias if one exists for id on dev.
1564 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1566 struct regulator_supply_alias *map;
1568 map = regulator_find_supply_alias(dev, id);
1570 list_del(&map->list);
1574 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1577 * regulator_bulk_register_supply_alias - register multiple aliases
1579 * @dev: device that will be given as the regulator "consumer"
1580 * @id: List of supply names or regulator IDs
1581 * @alias_dev: device that should be used to lookup the supply
1582 * @alias_id: List of supply names or regulator IDs that should be used to
1584 * @num_id: Number of aliases to register
1586 * @return 0 on success, an errno on failure.
1588 * This helper function allows drivers to register several supply
1589 * aliases in one operation. If any of the aliases cannot be
1590 * registered any aliases that were registered will be removed
1591 * before returning to the caller.
1593 int regulator_bulk_register_supply_alias(struct device *dev, const char **id,
1594 struct device *alias_dev,
1595 const char **alias_id,
1601 for (i = 0; i < num_id; ++i) {
1602 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1612 "Failed to create supply alias %s,%s -> %s,%s\n",
1613 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1616 regulator_unregister_supply_alias(dev, id[i]);
1620 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1623 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1625 * @dev: device that will be given as the regulator "consumer"
1626 * @id: List of supply names or regulator IDs
1627 * @num_id: Number of aliases to unregister
1629 * This helper function allows drivers to unregister several supply
1630 * aliases in one operation.
1632 void regulator_bulk_unregister_supply_alias(struct device *dev,
1638 for (i = 0; i < num_id; ++i)
1639 regulator_unregister_supply_alias(dev, id[i]);
1641 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1644 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1645 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1646 const struct regulator_config *config)
1648 struct regulator_enable_gpio *pin;
1651 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1652 if (pin->gpio == config->ena_gpio) {
1653 rdev_dbg(rdev, "GPIO %d is already used\n",
1655 goto update_ena_gpio_to_rdev;
1659 ret = gpio_request_one(config->ena_gpio,
1660 GPIOF_DIR_OUT | config->ena_gpio_flags,
1661 rdev_get_name(rdev));
1665 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1667 gpio_free(config->ena_gpio);
1671 pin->gpio = config->ena_gpio;
1672 pin->ena_gpio_invert = config->ena_gpio_invert;
1673 list_add(&pin->list, ®ulator_ena_gpio_list);
1675 update_ena_gpio_to_rdev:
1676 pin->request_count++;
1677 rdev->ena_pin = pin;
1681 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1683 struct regulator_enable_gpio *pin, *n;
1688 /* Free the GPIO only in case of no use */
1689 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1690 if (pin->gpio == rdev->ena_pin->gpio) {
1691 if (pin->request_count <= 1) {
1692 pin->request_count = 0;
1693 gpio_free(pin->gpio);
1694 list_del(&pin->list);
1697 pin->request_count--;
1704 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1705 * @rdev: regulator_dev structure
1706 * @enable: enable GPIO at initial use?
1708 * GPIO is enabled in case of initial use. (enable_count is 0)
1709 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1711 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1713 struct regulator_enable_gpio *pin = rdev->ena_pin;
1719 /* Enable GPIO at initial use */
1720 if (pin->enable_count == 0)
1721 gpio_set_value_cansleep(pin->gpio,
1722 !pin->ena_gpio_invert);
1724 pin->enable_count++;
1726 if (pin->enable_count > 1) {
1727 pin->enable_count--;
1731 /* Disable GPIO if not used */
1732 if (pin->enable_count <= 1) {
1733 gpio_set_value_cansleep(pin->gpio,
1734 pin->ena_gpio_invert);
1735 pin->enable_count = 0;
1742 static int _regulator_do_enable(struct regulator_dev *rdev)
1746 /* Query before enabling in case configuration dependent. */
1747 ret = _regulator_get_enable_time(rdev);
1751 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1755 trace_regulator_enable(rdev_get_name(rdev));
1757 if (rdev->ena_pin) {
1758 ret = regulator_ena_gpio_ctrl(rdev, true);
1761 rdev->ena_gpio_state = 1;
1762 } else if (rdev->desc->ops->enable) {
1763 ret = rdev->desc->ops->enable(rdev);
1770 /* Allow the regulator to ramp; it would be useful to extend
1771 * this for bulk operations so that the regulators can ramp
1773 trace_regulator_enable_delay(rdev_get_name(rdev));
1776 * Delay for the requested amount of time as per the guidelines in:
1778 * Documentation/timers/timers-howto.txt
1780 * The assumption here is that regulators will never be enabled in
1781 * atomic context and therefore sleeping functions can be used.
1784 unsigned int ms = delay / 1000;
1785 unsigned int us = delay % 1000;
1789 * For small enough values, handle super-millisecond
1790 * delays in the usleep_range() call below.
1799 * Give the scheduler some room to coalesce with any other
1800 * wakeup sources. For delays shorter than 10 us, don't even
1801 * bother setting up high-resolution timers and just busy-
1805 usleep_range(us, us + 100);
1810 trace_regulator_enable_complete(rdev_get_name(rdev));
1815 /* locks held by regulator_enable() */
1816 static int _regulator_enable(struct regulator_dev *rdev)
1820 /* check voltage and requested load before enabling */
1821 if (rdev->constraints &&
1822 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1823 drms_uA_update(rdev);
1825 if (rdev->use_count == 0) {
1826 /* The regulator may on if it's not switchable or left on */
1827 ret = _regulator_is_enabled(rdev);
1828 if (ret == -EINVAL || ret == 0) {
1829 if (!_regulator_can_change_status(rdev))
1832 ret = _regulator_do_enable(rdev);
1836 } else if (ret < 0) {
1837 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1840 /* Fallthrough on positive return values - already enabled */
1849 * regulator_enable - enable regulator output
1850 * @regulator: regulator source
1852 * Request that the regulator be enabled with the regulator output at
1853 * the predefined voltage or current value. Calls to regulator_enable()
1854 * must be balanced with calls to regulator_disable().
1856 * NOTE: the output value can be set by other drivers, boot loader or may be
1857 * hardwired in the regulator.
1859 int regulator_enable(struct regulator *regulator)
1861 struct regulator_dev *rdev = regulator->rdev;
1864 if (regulator->always_on)
1868 ret = regulator_enable(rdev->supply);
1873 mutex_lock(&rdev->mutex);
1874 ret = _regulator_enable(rdev);
1875 mutex_unlock(&rdev->mutex);
1877 if (ret != 0 && rdev->supply)
1878 regulator_disable(rdev->supply);
1882 EXPORT_SYMBOL_GPL(regulator_enable);
1884 static int _regulator_do_disable(struct regulator_dev *rdev)
1888 trace_regulator_disable(rdev_get_name(rdev));
1890 if (rdev->ena_pin) {
1891 ret = regulator_ena_gpio_ctrl(rdev, false);
1894 rdev->ena_gpio_state = 0;
1896 } else if (rdev->desc->ops->disable) {
1897 ret = rdev->desc->ops->disable(rdev);
1902 trace_regulator_disable_complete(rdev_get_name(rdev));
1907 /* locks held by regulator_disable() */
1908 static int _regulator_disable(struct regulator_dev *rdev)
1912 if (WARN(rdev->use_count <= 0,
1913 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1916 /* are we the last user and permitted to disable ? */
1917 if (rdev->use_count == 1 &&
1918 (rdev->constraints && !rdev->constraints->always_on)) {
1920 /* we are last user */
1921 if (_regulator_can_change_status(rdev)) {
1922 ret = _regulator_do_disable(rdev);
1924 rdev_err(rdev, "failed to disable\n");
1927 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1931 rdev->use_count = 0;
1932 } else if (rdev->use_count > 1) {
1934 if (rdev->constraints &&
1935 (rdev->constraints->valid_ops_mask &
1936 REGULATOR_CHANGE_DRMS))
1937 drms_uA_update(rdev);
1946 * regulator_disable - disable regulator output
1947 * @regulator: regulator source
1949 * Disable the regulator output voltage or current. Calls to
1950 * regulator_enable() must be balanced with calls to
1951 * regulator_disable().
1953 * NOTE: this will only disable the regulator output if no other consumer
1954 * devices have it enabled, the regulator device supports disabling and
1955 * machine constraints permit this operation.
1957 int regulator_disable(struct regulator *regulator)
1959 struct regulator_dev *rdev = regulator->rdev;
1962 if (regulator->always_on)
1965 mutex_lock(&rdev->mutex);
1966 ret = _regulator_disable(rdev);
1967 mutex_unlock(&rdev->mutex);
1969 if (ret == 0 && rdev->supply)
1970 regulator_disable(rdev->supply);
1974 EXPORT_SYMBOL_GPL(regulator_disable);
1976 /* locks held by regulator_force_disable() */
1977 static int _regulator_force_disable(struct regulator_dev *rdev)
1981 ret = _regulator_do_disable(rdev);
1983 rdev_err(rdev, "failed to force disable\n");
1987 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1988 REGULATOR_EVENT_DISABLE, NULL);
1994 * regulator_force_disable - force disable regulator output
1995 * @regulator: regulator source
1997 * Forcibly disable the regulator output voltage or current.
1998 * NOTE: this *will* disable the regulator output even if other consumer
1999 * devices have it enabled. This should be used for situations when device
2000 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2002 int regulator_force_disable(struct regulator *regulator)
2004 struct regulator_dev *rdev = regulator->rdev;
2007 mutex_lock(&rdev->mutex);
2008 regulator->uA_load = 0;
2009 ret = _regulator_force_disable(regulator->rdev);
2010 mutex_unlock(&rdev->mutex);
2013 while (rdev->open_count--)
2014 regulator_disable(rdev->supply);
2018 EXPORT_SYMBOL_GPL(regulator_force_disable);
2020 static void regulator_disable_work(struct work_struct *work)
2022 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2026 mutex_lock(&rdev->mutex);
2028 BUG_ON(!rdev->deferred_disables);
2030 count = rdev->deferred_disables;
2031 rdev->deferred_disables = 0;
2033 for (i = 0; i < count; i++) {
2034 ret = _regulator_disable(rdev);
2036 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2039 mutex_unlock(&rdev->mutex);
2042 for (i = 0; i < count; i++) {
2043 ret = regulator_disable(rdev->supply);
2046 "Supply disable failed: %d\n", ret);
2053 * regulator_disable_deferred - disable regulator output with delay
2054 * @regulator: regulator source
2055 * @ms: miliseconds until the regulator is disabled
2057 * Execute regulator_disable() on the regulator after a delay. This
2058 * is intended for use with devices that require some time to quiesce.
2060 * NOTE: this will only disable the regulator output if no other consumer
2061 * devices have it enabled, the regulator device supports disabling and
2062 * machine constraints permit this operation.
2064 int regulator_disable_deferred(struct regulator *regulator, int ms)
2066 struct regulator_dev *rdev = regulator->rdev;
2069 if (regulator->always_on)
2073 return regulator_disable(regulator);
2075 mutex_lock(&rdev->mutex);
2076 rdev->deferred_disables++;
2077 mutex_unlock(&rdev->mutex);
2079 ret = queue_delayed_work(system_power_efficient_wq,
2080 &rdev->disable_work,
2081 msecs_to_jiffies(ms));
2087 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2089 static int _regulator_is_enabled(struct regulator_dev *rdev)
2091 /* A GPIO control always takes precedence */
2093 return rdev->ena_gpio_state;
2095 /* If we don't know then assume that the regulator is always on */
2096 if (!rdev->desc->ops->is_enabled)
2099 return rdev->desc->ops->is_enabled(rdev);
2103 * regulator_is_enabled - is the regulator output enabled
2104 * @regulator: regulator source
2106 * Returns positive if the regulator driver backing the source/client
2107 * has requested that the device be enabled, zero if it hasn't, else a
2108 * negative errno code.
2110 * Note that the device backing this regulator handle can have multiple
2111 * users, so it might be enabled even if regulator_enable() was never
2112 * called for this particular source.
2114 int regulator_is_enabled(struct regulator *regulator)
2118 if (regulator->always_on)
2121 mutex_lock(®ulator->rdev->mutex);
2122 ret = _regulator_is_enabled(regulator->rdev);
2123 mutex_unlock(®ulator->rdev->mutex);
2127 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2130 * regulator_can_change_voltage - check if regulator can change voltage
2131 * @regulator: regulator source
2133 * Returns positive if the regulator driver backing the source/client
2134 * can change its voltage, false otherwise. Usefull for detecting fixed
2135 * or dummy regulators and disabling voltage change logic in the client
2138 int regulator_can_change_voltage(struct regulator *regulator)
2140 struct regulator_dev *rdev = regulator->rdev;
2142 if (rdev->constraints &&
2143 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2144 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2147 if (rdev->desc->continuous_voltage_range &&
2148 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2149 rdev->constraints->min_uV != rdev->constraints->max_uV)
2155 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2158 * regulator_count_voltages - count regulator_list_voltage() selectors
2159 * @regulator: regulator source
2161 * Returns number of selectors, or negative errno. Selectors are
2162 * numbered starting at zero, and typically correspond to bitfields
2163 * in hardware registers.
2165 int regulator_count_voltages(struct regulator *regulator)
2167 struct regulator_dev *rdev = regulator->rdev;
2169 return rdev->desc->n_voltages ? : -EINVAL;
2171 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2174 * regulator_list_voltage - enumerate supported voltages
2175 * @regulator: regulator source
2176 * @selector: identify voltage to list
2177 * Context: can sleep
2179 * Returns a voltage that can be passed to @regulator_set_voltage(),
2180 * zero if this selector code can't be used on this system, or a
2183 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2185 struct regulator_dev *rdev = regulator->rdev;
2186 struct regulator_ops *ops = rdev->desc->ops;
2189 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2190 return rdev->desc->fixed_uV;
2192 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2195 mutex_lock(&rdev->mutex);
2196 ret = ops->list_voltage(rdev, selector);
2197 mutex_unlock(&rdev->mutex);
2200 if (ret < rdev->constraints->min_uV)
2202 else if (ret > rdev->constraints->max_uV)
2208 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2211 * regulator_get_linear_step - return the voltage step size between VSEL values
2212 * @regulator: regulator source
2214 * Returns the voltage step size between VSEL values for linear
2215 * regulators, or return 0 if the regulator isn't a linear regulator.
2217 unsigned int regulator_get_linear_step(struct regulator *regulator)
2219 struct regulator_dev *rdev = regulator->rdev;
2221 return rdev->desc->uV_step;
2223 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2226 * regulator_is_supported_voltage - check if a voltage range can be supported
2228 * @regulator: Regulator to check.
2229 * @min_uV: Minimum required voltage in uV.
2230 * @max_uV: Maximum required voltage in uV.
2232 * Returns a boolean or a negative error code.
2234 int regulator_is_supported_voltage(struct regulator *regulator,
2235 int min_uV, int max_uV)
2237 struct regulator_dev *rdev = regulator->rdev;
2238 int i, voltages, ret;
2240 /* If we can't change voltage check the current voltage */
2241 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2242 ret = regulator_get_voltage(regulator);
2244 return min_uV <= ret && ret <= max_uV;
2249 /* Any voltage within constrains range is fine? */
2250 if (rdev->desc->continuous_voltage_range)
2251 return min_uV >= rdev->constraints->min_uV &&
2252 max_uV <= rdev->constraints->max_uV;
2254 ret = regulator_count_voltages(regulator);
2259 for (i = 0; i < voltages; i++) {
2260 ret = regulator_list_voltage(regulator, i);
2262 if (ret >= min_uV && ret <= max_uV)
2268 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2270 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2271 int min_uV, int max_uV)
2276 unsigned int selector;
2277 int old_selector = -1;
2279 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2281 min_uV += rdev->constraints->uV_offset;
2282 max_uV += rdev->constraints->uV_offset;
2285 * If we can't obtain the old selector there is not enough
2286 * info to call set_voltage_time_sel().
2288 if (_regulator_is_enabled(rdev) &&
2289 rdev->desc->ops->set_voltage_time_sel &&
2290 rdev->desc->ops->get_voltage_sel) {
2291 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2292 if (old_selector < 0)
2293 return old_selector;
2296 if (rdev->desc->ops->set_voltage) {
2297 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2301 if (rdev->desc->ops->list_voltage)
2302 best_val = rdev->desc->ops->list_voltage(rdev,
2305 best_val = _regulator_get_voltage(rdev);
2308 } else if (rdev->desc->ops->set_voltage_sel) {
2309 if (rdev->desc->ops->map_voltage) {
2310 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2313 if (rdev->desc->ops->list_voltage ==
2314 regulator_list_voltage_linear)
2315 ret = regulator_map_voltage_linear(rdev,
2318 ret = regulator_map_voltage_iterate(rdev,
2323 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2324 if (min_uV <= best_val && max_uV >= best_val) {
2326 if (old_selector == selector)
2329 ret = rdev->desc->ops->set_voltage_sel(
2339 /* Call set_voltage_time_sel if successfully obtained old_selector */
2340 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2341 && old_selector != selector) {
2343 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2344 old_selector, selector);
2346 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2351 /* Insert any necessary delays */
2352 if (delay >= 1000) {
2353 mdelay(delay / 1000);
2354 udelay(delay % 1000);
2360 if (ret == 0 && best_val >= 0) {
2361 unsigned long data = best_val;
2363 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2367 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2373 * regulator_set_voltage - set regulator output voltage
2374 * @regulator: regulator source
2375 * @min_uV: Minimum required voltage in uV
2376 * @max_uV: Maximum acceptable voltage in uV
2378 * Sets a voltage regulator to the desired output voltage. This can be set
2379 * during any regulator state. IOW, regulator can be disabled or enabled.
2381 * If the regulator is enabled then the voltage will change to the new value
2382 * immediately otherwise if the regulator is disabled the regulator will
2383 * output at the new voltage when enabled.
2385 * NOTE: If the regulator is shared between several devices then the lowest
2386 * request voltage that meets the system constraints will be used.
2387 * Regulator system constraints must be set for this regulator before
2388 * calling this function otherwise this call will fail.
2390 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2392 struct regulator_dev *rdev = regulator->rdev;
2394 int old_min_uV, old_max_uV;
2396 mutex_lock(&rdev->mutex);
2398 /* If we're setting the same range as last time the change
2399 * should be a noop (some cpufreq implementations use the same
2400 * voltage for multiple frequencies, for example).
2402 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2406 if (!rdev->desc->ops->set_voltage &&
2407 !rdev->desc->ops->set_voltage_sel) {
2412 /* constraints check */
2413 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2417 /* restore original values in case of error */
2418 old_min_uV = regulator->min_uV;
2419 old_max_uV = regulator->max_uV;
2420 regulator->min_uV = min_uV;
2421 regulator->max_uV = max_uV;
2423 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2427 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2432 mutex_unlock(&rdev->mutex);
2435 regulator->min_uV = old_min_uV;
2436 regulator->max_uV = old_max_uV;
2437 mutex_unlock(&rdev->mutex);
2440 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2443 * regulator_set_voltage_time - get raise/fall time
2444 * @regulator: regulator source
2445 * @old_uV: starting voltage in microvolts
2446 * @new_uV: target voltage in microvolts
2448 * Provided with the starting and ending voltage, this function attempts to
2449 * calculate the time in microseconds required to rise or fall to this new
2452 int regulator_set_voltage_time(struct regulator *regulator,
2453 int old_uV, int new_uV)
2455 struct regulator_dev *rdev = regulator->rdev;
2456 struct regulator_ops *ops = rdev->desc->ops;
2462 /* Currently requires operations to do this */
2463 if (!ops->list_voltage || !ops->set_voltage_time_sel
2464 || !rdev->desc->n_voltages)
2467 for (i = 0; i < rdev->desc->n_voltages; i++) {
2468 /* We only look for exact voltage matches here */
2469 voltage = regulator_list_voltage(regulator, i);
2474 if (voltage == old_uV)
2476 if (voltage == new_uV)
2480 if (old_sel < 0 || new_sel < 0)
2483 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2485 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2488 * regulator_set_voltage_time_sel - get raise/fall time
2489 * @rdev: regulator source device
2490 * @old_selector: selector for starting voltage
2491 * @new_selector: selector for target voltage
2493 * Provided with the starting and target voltage selectors, this function
2494 * returns time in microseconds required to rise or fall to this new voltage
2496 * Drivers providing ramp_delay in regulation_constraints can use this as their
2497 * set_voltage_time_sel() operation.
2499 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2500 unsigned int old_selector,
2501 unsigned int new_selector)
2503 unsigned int ramp_delay = 0;
2504 int old_volt, new_volt;
2506 if (rdev->constraints->ramp_delay)
2507 ramp_delay = rdev->constraints->ramp_delay;
2508 else if (rdev->desc->ramp_delay)
2509 ramp_delay = rdev->desc->ramp_delay;
2511 if (ramp_delay == 0) {
2512 rdev_warn(rdev, "ramp_delay not set\n");
2517 if (!rdev->desc->ops->list_voltage)
2520 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2521 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2523 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2525 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2528 * regulator_sync_voltage - re-apply last regulator output voltage
2529 * @regulator: regulator source
2531 * Re-apply the last configured voltage. This is intended to be used
2532 * where some external control source the consumer is cooperating with
2533 * has caused the configured voltage to change.
2535 int regulator_sync_voltage(struct regulator *regulator)
2537 struct regulator_dev *rdev = regulator->rdev;
2538 int ret, min_uV, max_uV;
2540 mutex_lock(&rdev->mutex);
2542 if (!rdev->desc->ops->set_voltage &&
2543 !rdev->desc->ops->set_voltage_sel) {
2548 /* This is only going to work if we've had a voltage configured. */
2549 if (!regulator->min_uV && !regulator->max_uV) {
2554 min_uV = regulator->min_uV;
2555 max_uV = regulator->max_uV;
2557 /* This should be a paranoia check... */
2558 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2562 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2566 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2569 mutex_unlock(&rdev->mutex);
2572 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2574 static int _regulator_get_voltage(struct regulator_dev *rdev)
2578 if (rdev->desc->ops->get_voltage_sel) {
2579 sel = rdev->desc->ops->get_voltage_sel(rdev);
2582 ret = rdev->desc->ops->list_voltage(rdev, sel);
2583 } else if (rdev->desc->ops->get_voltage) {
2584 ret = rdev->desc->ops->get_voltage(rdev);
2585 } else if (rdev->desc->ops->list_voltage) {
2586 ret = rdev->desc->ops->list_voltage(rdev, 0);
2587 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2588 ret = rdev->desc->fixed_uV;
2595 return ret - rdev->constraints->uV_offset;
2599 * regulator_get_voltage - get regulator output voltage
2600 * @regulator: regulator source
2602 * This returns the current regulator voltage in uV.
2604 * NOTE: If the regulator is disabled it will return the voltage value. This
2605 * function should not be used to determine regulator state.
2607 int regulator_get_voltage(struct regulator *regulator)
2611 mutex_lock(®ulator->rdev->mutex);
2613 ret = _regulator_get_voltage(regulator->rdev);
2615 mutex_unlock(®ulator->rdev->mutex);
2619 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2622 * regulator_set_current_limit - set regulator output current limit
2623 * @regulator: regulator source
2624 * @min_uA: Minimum supported current in uA
2625 * @max_uA: Maximum supported current in uA
2627 * Sets current sink to the desired output current. This can be set during
2628 * any regulator state. IOW, regulator can be disabled or enabled.
2630 * If the regulator is enabled then the current will change to the new value
2631 * immediately otherwise if the regulator is disabled the regulator will
2632 * output at the new current when enabled.
2634 * NOTE: Regulator system constraints must be set for this regulator before
2635 * calling this function otherwise this call will fail.
2637 int regulator_set_current_limit(struct regulator *regulator,
2638 int min_uA, int max_uA)
2640 struct regulator_dev *rdev = regulator->rdev;
2643 mutex_lock(&rdev->mutex);
2646 if (!rdev->desc->ops->set_current_limit) {
2651 /* constraints check */
2652 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2656 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2658 mutex_unlock(&rdev->mutex);
2661 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2663 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2667 mutex_lock(&rdev->mutex);
2670 if (!rdev->desc->ops->get_current_limit) {
2675 ret = rdev->desc->ops->get_current_limit(rdev);
2677 mutex_unlock(&rdev->mutex);
2682 * regulator_get_current_limit - get regulator output current
2683 * @regulator: regulator source
2685 * This returns the current supplied by the specified current sink in uA.
2687 * NOTE: If the regulator is disabled it will return the current value. This
2688 * function should not be used to determine regulator state.
2690 int regulator_get_current_limit(struct regulator *regulator)
2692 return _regulator_get_current_limit(regulator->rdev);
2694 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2697 * regulator_set_mode - set regulator operating mode
2698 * @regulator: regulator source
2699 * @mode: operating mode - one of the REGULATOR_MODE constants
2701 * Set regulator operating mode to increase regulator efficiency or improve
2702 * regulation performance.
2704 * NOTE: Regulator system constraints must be set for this regulator before
2705 * calling this function otherwise this call will fail.
2707 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2709 struct regulator_dev *rdev = regulator->rdev;
2711 int regulator_curr_mode;
2713 mutex_lock(&rdev->mutex);
2716 if (!rdev->desc->ops->set_mode) {
2721 /* return if the same mode is requested */
2722 if (rdev->desc->ops->get_mode) {
2723 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2724 if (regulator_curr_mode == mode) {
2730 /* constraints check */
2731 ret = regulator_mode_constrain(rdev, &mode);
2735 ret = rdev->desc->ops->set_mode(rdev, mode);
2737 mutex_unlock(&rdev->mutex);
2740 EXPORT_SYMBOL_GPL(regulator_set_mode);
2742 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2746 mutex_lock(&rdev->mutex);
2749 if (!rdev->desc->ops->get_mode) {
2754 ret = rdev->desc->ops->get_mode(rdev);
2756 mutex_unlock(&rdev->mutex);
2761 * regulator_get_mode - get regulator operating mode
2762 * @regulator: regulator source
2764 * Get the current regulator operating mode.
2766 unsigned int regulator_get_mode(struct regulator *regulator)
2768 return _regulator_get_mode(regulator->rdev);
2770 EXPORT_SYMBOL_GPL(regulator_get_mode);
2773 * regulator_set_optimum_mode - set regulator optimum operating mode
2774 * @regulator: regulator source
2775 * @uA_load: load current
2777 * Notifies the regulator core of a new device load. This is then used by
2778 * DRMS (if enabled by constraints) to set the most efficient regulator
2779 * operating mode for the new regulator loading.
2781 * Consumer devices notify their supply regulator of the maximum power
2782 * they will require (can be taken from device datasheet in the power
2783 * consumption tables) when they change operational status and hence power
2784 * state. Examples of operational state changes that can affect power
2785 * consumption are :-
2787 * o Device is opened / closed.
2788 * o Device I/O is about to begin or has just finished.
2789 * o Device is idling in between work.
2791 * This information is also exported via sysfs to userspace.
2793 * DRMS will sum the total requested load on the regulator and change
2794 * to the most efficient operating mode if platform constraints allow.
2796 * Returns the new regulator mode or error.
2798 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2800 struct regulator_dev *rdev = regulator->rdev;
2801 struct regulator *consumer;
2802 int ret, output_uV, input_uV = 0, total_uA_load = 0;
2806 input_uV = regulator_get_voltage(rdev->supply);
2808 mutex_lock(&rdev->mutex);
2811 * first check to see if we can set modes at all, otherwise just
2812 * tell the consumer everything is OK.
2814 regulator->uA_load = uA_load;
2815 ret = regulator_check_drms(rdev);
2821 if (!rdev->desc->ops->get_optimum_mode)
2825 * we can actually do this so any errors are indicators of
2826 * potential real failure.
2830 if (!rdev->desc->ops->set_mode)
2833 /* get output voltage */
2834 output_uV = _regulator_get_voltage(rdev);
2835 if (output_uV <= 0) {
2836 rdev_err(rdev, "invalid output voltage found\n");
2840 /* No supply? Use constraint voltage */
2842 input_uV = rdev->constraints->input_uV;
2843 if (input_uV <= 0) {
2844 rdev_err(rdev, "invalid input voltage found\n");
2848 /* calc total requested load for this regulator */
2849 list_for_each_entry(consumer, &rdev->consumer_list, list)
2850 total_uA_load += consumer->uA_load;
2852 mode = rdev->desc->ops->get_optimum_mode(rdev,
2853 input_uV, output_uV,
2855 ret = regulator_mode_constrain(rdev, &mode);
2857 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2858 total_uA_load, input_uV, output_uV);
2862 ret = rdev->desc->ops->set_mode(rdev, mode);
2864 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2869 mutex_unlock(&rdev->mutex);
2872 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2875 * regulator_allow_bypass - allow the regulator to go into bypass mode
2877 * @regulator: Regulator to configure
2878 * @enable: enable or disable bypass mode
2880 * Allow the regulator to go into bypass mode if all other consumers
2881 * for the regulator also enable bypass mode and the machine
2882 * constraints allow this. Bypass mode means that the regulator is
2883 * simply passing the input directly to the output with no regulation.
2885 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2887 struct regulator_dev *rdev = regulator->rdev;
2890 if (!rdev->desc->ops->set_bypass)
2893 if (rdev->constraints &&
2894 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2897 mutex_lock(&rdev->mutex);
2899 if (enable && !regulator->bypass) {
2900 rdev->bypass_count++;
2902 if (rdev->bypass_count == rdev->open_count) {
2903 ret = rdev->desc->ops->set_bypass(rdev, enable);
2905 rdev->bypass_count--;
2908 } else if (!enable && regulator->bypass) {
2909 rdev->bypass_count--;
2911 if (rdev->bypass_count != rdev->open_count) {
2912 ret = rdev->desc->ops->set_bypass(rdev, enable);
2914 rdev->bypass_count++;
2919 regulator->bypass = enable;
2921 mutex_unlock(&rdev->mutex);
2925 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2928 * regulator_register_notifier - register regulator event notifier
2929 * @regulator: regulator source
2930 * @nb: notifier block
2932 * Register notifier block to receive regulator events.
2934 int regulator_register_notifier(struct regulator *regulator,
2935 struct notifier_block *nb)
2937 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2940 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2943 * regulator_unregister_notifier - unregister regulator event notifier
2944 * @regulator: regulator source
2945 * @nb: notifier block
2947 * Unregister regulator event notifier block.
2949 int regulator_unregister_notifier(struct regulator *regulator,
2950 struct notifier_block *nb)
2952 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2955 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2957 /* notify regulator consumers and downstream regulator consumers.
2958 * Note mutex must be held by caller.
2960 static void _notifier_call_chain(struct regulator_dev *rdev,
2961 unsigned long event, void *data)
2963 /* call rdev chain first */
2964 blocking_notifier_call_chain(&rdev->notifier, event, data);
2968 * regulator_bulk_get - get multiple regulator consumers
2970 * @dev: Device to supply
2971 * @num_consumers: Number of consumers to register
2972 * @consumers: Configuration of consumers; clients are stored here.
2974 * @return 0 on success, an errno on failure.
2976 * This helper function allows drivers to get several regulator
2977 * consumers in one operation. If any of the regulators cannot be
2978 * acquired then any regulators that were allocated will be freed
2979 * before returning to the caller.
2981 int regulator_bulk_get(struct device *dev, int num_consumers,
2982 struct regulator_bulk_data *consumers)
2987 for (i = 0; i < num_consumers; i++)
2988 consumers[i].consumer = NULL;
2990 for (i = 0; i < num_consumers; i++) {
2991 consumers[i].consumer = regulator_get(dev,
2992 consumers[i].supply);
2993 if (IS_ERR(consumers[i].consumer)) {
2994 ret = PTR_ERR(consumers[i].consumer);
2995 dev_err(dev, "Failed to get supply '%s': %d\n",
2996 consumers[i].supply, ret);
2997 consumers[i].consumer = NULL;
3006 regulator_put(consumers[i].consumer);
3010 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3012 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3014 struct regulator_bulk_data *bulk = data;
3016 bulk->ret = regulator_enable(bulk->consumer);
3020 * regulator_bulk_enable - enable multiple regulator consumers
3022 * @num_consumers: Number of consumers
3023 * @consumers: Consumer data; clients are stored here.
3024 * @return 0 on success, an errno on failure
3026 * This convenience API allows consumers to enable multiple regulator
3027 * clients in a single API call. If any consumers cannot be enabled
3028 * then any others that were enabled will be disabled again prior to
3031 int regulator_bulk_enable(int num_consumers,
3032 struct regulator_bulk_data *consumers)
3034 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3038 for (i = 0; i < num_consumers; i++) {
3039 if (consumers[i].consumer->always_on)
3040 consumers[i].ret = 0;
3042 async_schedule_domain(regulator_bulk_enable_async,
3043 &consumers[i], &async_domain);
3046 async_synchronize_full_domain(&async_domain);
3048 /* If any consumer failed we need to unwind any that succeeded */
3049 for (i = 0; i < num_consumers; i++) {
3050 if (consumers[i].ret != 0) {
3051 ret = consumers[i].ret;
3059 for (i = 0; i < num_consumers; i++) {
3060 if (consumers[i].ret < 0)
3061 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3064 regulator_disable(consumers[i].consumer);
3069 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3072 * regulator_bulk_disable - disable multiple regulator consumers
3074 * @num_consumers: Number of consumers
3075 * @consumers: Consumer data; clients are stored here.
3076 * @return 0 on success, an errno on failure
3078 * This convenience API allows consumers to disable multiple regulator
3079 * clients in a single API call. If any consumers cannot be disabled
3080 * then any others that were disabled will be enabled again prior to
3083 int regulator_bulk_disable(int num_consumers,
3084 struct regulator_bulk_data *consumers)
3089 for (i = num_consumers - 1; i >= 0; --i) {
3090 ret = regulator_disable(consumers[i].consumer);
3098 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3099 for (++i; i < num_consumers; ++i) {
3100 r = regulator_enable(consumers[i].consumer);
3102 pr_err("Failed to reename %s: %d\n",
3103 consumers[i].supply, r);
3108 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3111 * regulator_bulk_force_disable - force disable multiple regulator consumers
3113 * @num_consumers: Number of consumers
3114 * @consumers: Consumer data; clients are stored here.
3115 * @return 0 on success, an errno on failure
3117 * This convenience API allows consumers to forcibly disable multiple regulator
3118 * clients in a single API call.
3119 * NOTE: This should be used for situations when device damage will
3120 * likely occur if the regulators are not disabled (e.g. over temp).
3121 * Although regulator_force_disable function call for some consumers can
3122 * return error numbers, the function is called for all consumers.
3124 int regulator_bulk_force_disable(int num_consumers,
3125 struct regulator_bulk_data *consumers)
3130 for (i = 0; i < num_consumers; i++)
3132 regulator_force_disable(consumers[i].consumer);
3134 for (i = 0; i < num_consumers; i++) {
3135 if (consumers[i].ret != 0) {
3136 ret = consumers[i].ret;
3145 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3148 * regulator_bulk_free - free multiple regulator consumers
3150 * @num_consumers: Number of consumers
3151 * @consumers: Consumer data; clients are stored here.
3153 * This convenience API allows consumers to free multiple regulator
3154 * clients in a single API call.
3156 void regulator_bulk_free(int num_consumers,
3157 struct regulator_bulk_data *consumers)
3161 for (i = 0; i < num_consumers; i++) {
3162 regulator_put(consumers[i].consumer);
3163 consumers[i].consumer = NULL;
3166 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3169 * regulator_notifier_call_chain - call regulator event notifier
3170 * @rdev: regulator source
3171 * @event: notifier block
3172 * @data: callback-specific data.
3174 * Called by regulator drivers to notify clients a regulator event has
3175 * occurred. We also notify regulator clients downstream.
3176 * Note lock must be held by caller.
3178 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3179 unsigned long event, void *data)
3181 _notifier_call_chain(rdev, event, data);
3185 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3188 * regulator_mode_to_status - convert a regulator mode into a status
3190 * @mode: Mode to convert
3192 * Convert a regulator mode into a status.
3194 int regulator_mode_to_status(unsigned int mode)
3197 case REGULATOR_MODE_FAST:
3198 return REGULATOR_STATUS_FAST;
3199 case REGULATOR_MODE_NORMAL:
3200 return REGULATOR_STATUS_NORMAL;
3201 case REGULATOR_MODE_IDLE:
3202 return REGULATOR_STATUS_IDLE;
3203 case REGULATOR_MODE_STANDBY:
3204 return REGULATOR_STATUS_STANDBY;
3206 return REGULATOR_STATUS_UNDEFINED;
3209 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3212 * To avoid cluttering sysfs (and memory) with useless state, only
3213 * create attributes that can be meaningfully displayed.
3215 static int add_regulator_attributes(struct regulator_dev *rdev)
3217 struct device *dev = &rdev->dev;
3218 struct regulator_ops *ops = rdev->desc->ops;
3221 /* some attributes need specific methods to be displayed */
3222 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3223 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3224 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3225 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3226 status = device_create_file(dev, &dev_attr_microvolts);
3230 if (ops->get_current_limit) {
3231 status = device_create_file(dev, &dev_attr_microamps);
3235 if (ops->get_mode) {
3236 status = device_create_file(dev, &dev_attr_opmode);
3240 if (rdev->ena_pin || ops->is_enabled) {
3241 status = device_create_file(dev, &dev_attr_state);
3245 if (ops->get_status) {
3246 status = device_create_file(dev, &dev_attr_status);
3250 if (ops->get_bypass) {
3251 status = device_create_file(dev, &dev_attr_bypass);
3256 /* some attributes are type-specific */
3257 if (rdev->desc->type == REGULATOR_CURRENT) {
3258 status = device_create_file(dev, &dev_attr_requested_microamps);
3263 /* all the other attributes exist to support constraints;
3264 * don't show them if there are no constraints, or if the
3265 * relevant supporting methods are missing.
3267 if (!rdev->constraints)
3270 /* constraints need specific supporting methods */
3271 if (ops->set_voltage || ops->set_voltage_sel) {
3272 status = device_create_file(dev, &dev_attr_min_microvolts);
3275 status = device_create_file(dev, &dev_attr_max_microvolts);
3279 if (ops->set_current_limit) {
3280 status = device_create_file(dev, &dev_attr_min_microamps);
3283 status = device_create_file(dev, &dev_attr_max_microamps);
3288 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3291 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3294 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3298 if (ops->set_suspend_voltage) {
3299 status = device_create_file(dev,
3300 &dev_attr_suspend_standby_microvolts);
3303 status = device_create_file(dev,
3304 &dev_attr_suspend_mem_microvolts);
3307 status = device_create_file(dev,
3308 &dev_attr_suspend_disk_microvolts);
3313 if (ops->set_suspend_mode) {
3314 status = device_create_file(dev,
3315 &dev_attr_suspend_standby_mode);
3318 status = device_create_file(dev,
3319 &dev_attr_suspend_mem_mode);
3322 status = device_create_file(dev,
3323 &dev_attr_suspend_disk_mode);
3331 static void rdev_init_debugfs(struct regulator_dev *rdev)
3333 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3334 if (!rdev->debugfs) {
3335 rdev_warn(rdev, "Failed to create debugfs directory\n");
3339 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3341 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3343 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3344 &rdev->bypass_count);
3348 * regulator_register - register regulator
3349 * @regulator_desc: regulator to register
3350 * @config: runtime configuration for regulator
3352 * Called by regulator drivers to register a regulator.
3353 * Returns a valid pointer to struct regulator_dev on success
3354 * or an ERR_PTR() on error.
3356 struct regulator_dev *
3357 regulator_register(const struct regulator_desc *regulator_desc,
3358 const struct regulator_config *config)
3360 const struct regulation_constraints *constraints = NULL;
3361 const struct regulator_init_data *init_data;
3362 static atomic_t regulator_no = ATOMIC_INIT(0);
3363 struct regulator_dev *rdev;
3366 const char *supply = NULL;
3368 if (regulator_desc == NULL || config == NULL)
3369 return ERR_PTR(-EINVAL);
3374 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3375 return ERR_PTR(-EINVAL);
3377 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3378 regulator_desc->type != REGULATOR_CURRENT)
3379 return ERR_PTR(-EINVAL);
3381 /* Only one of each should be implemented */
3382 WARN_ON(regulator_desc->ops->get_voltage &&
3383 regulator_desc->ops->get_voltage_sel);
3384 WARN_ON(regulator_desc->ops->set_voltage &&
3385 regulator_desc->ops->set_voltage_sel);
3387 /* If we're using selectors we must implement list_voltage. */
3388 if (regulator_desc->ops->get_voltage_sel &&
3389 !regulator_desc->ops->list_voltage) {
3390 return ERR_PTR(-EINVAL);
3392 if (regulator_desc->ops->set_voltage_sel &&
3393 !regulator_desc->ops->list_voltage) {
3394 return ERR_PTR(-EINVAL);
3397 init_data = config->init_data;
3399 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3401 return ERR_PTR(-ENOMEM);
3403 mutex_lock(®ulator_list_mutex);
3405 mutex_init(&rdev->mutex);
3406 rdev->reg_data = config->driver_data;
3407 rdev->owner = regulator_desc->owner;
3408 rdev->desc = regulator_desc;
3410 rdev->regmap = config->regmap;
3411 else if (dev_get_regmap(dev, NULL))
3412 rdev->regmap = dev_get_regmap(dev, NULL);
3413 else if (dev->parent)
3414 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3415 INIT_LIST_HEAD(&rdev->consumer_list);
3416 INIT_LIST_HEAD(&rdev->list);
3417 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3418 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3420 /* preform any regulator specific init */
3421 if (init_data && init_data->regulator_init) {
3422 ret = init_data->regulator_init(rdev->reg_data);
3427 /* register with sysfs */
3428 rdev->dev.class = ®ulator_class;
3429 rdev->dev.of_node = config->of_node;
3430 rdev->dev.parent = dev;
3431 dev_set_name(&rdev->dev, "regulator.%d",
3432 atomic_inc_return(®ulator_no) - 1);
3433 ret = device_register(&rdev->dev);
3435 put_device(&rdev->dev);
3439 dev_set_drvdata(&rdev->dev, rdev);
3441 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3442 ret = regulator_ena_gpio_request(rdev, config);
3444 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3445 config->ena_gpio, ret);
3449 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3450 rdev->ena_gpio_state = 1;
3452 if (config->ena_gpio_invert)
3453 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3456 /* set regulator constraints */
3458 constraints = &init_data->constraints;
3460 ret = set_machine_constraints(rdev, constraints);
3464 /* add attributes supported by this regulator */
3465 ret = add_regulator_attributes(rdev);
3469 if (init_data && init_data->supply_regulator)
3470 supply = init_data->supply_regulator;
3471 else if (regulator_desc->supply_name)
3472 supply = regulator_desc->supply_name;
3475 struct regulator_dev *r;
3477 r = regulator_dev_lookup(dev, supply, &ret);
3479 if (ret == -ENODEV) {
3481 * No supply was specified for this regulator and
3482 * there will never be one.
3487 dev_err(dev, "Failed to find supply %s\n", supply);
3488 ret = -EPROBE_DEFER;
3492 ret = set_supply(rdev, r);
3496 /* Enable supply if rail is enabled */
3497 if (_regulator_is_enabled(rdev)) {
3498 ret = regulator_enable(rdev->supply);
3505 /* add consumers devices */
3507 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3508 ret = set_consumer_device_supply(rdev,
3509 init_data->consumer_supplies[i].dev_name,
3510 init_data->consumer_supplies[i].supply);
3512 dev_err(dev, "Failed to set supply %s\n",
3513 init_data->consumer_supplies[i].supply);
3514 goto unset_supplies;
3519 list_add(&rdev->list, ®ulator_list);
3521 rdev_init_debugfs(rdev);
3523 mutex_unlock(®ulator_list_mutex);
3527 unset_regulator_supplies(rdev);
3531 _regulator_put(rdev->supply);
3532 regulator_ena_gpio_free(rdev);
3533 kfree(rdev->constraints);
3535 device_unregister(&rdev->dev);
3536 /* device core frees rdev */
3537 rdev = ERR_PTR(ret);
3542 rdev = ERR_PTR(ret);
3545 EXPORT_SYMBOL_GPL(regulator_register);
3548 * regulator_unregister - unregister regulator
3549 * @rdev: regulator to unregister
3551 * Called by regulator drivers to unregister a regulator.
3553 void regulator_unregister(struct regulator_dev *rdev)
3559 while (rdev->use_count--)
3560 regulator_disable(rdev->supply);
3561 regulator_put(rdev->supply);
3563 mutex_lock(®ulator_list_mutex);
3564 debugfs_remove_recursive(rdev->debugfs);
3565 flush_work(&rdev->disable_work.work);
3566 WARN_ON(rdev->open_count);
3567 unset_regulator_supplies(rdev);
3568 list_del(&rdev->list);
3569 kfree(rdev->constraints);
3570 regulator_ena_gpio_free(rdev);
3571 device_unregister(&rdev->dev);
3572 mutex_unlock(®ulator_list_mutex);
3574 EXPORT_SYMBOL_GPL(regulator_unregister);
3577 * regulator_suspend_prepare - prepare regulators for system wide suspend
3578 * @state: system suspend state
3580 * Configure each regulator with it's suspend operating parameters for state.
3581 * This will usually be called by machine suspend code prior to supending.
3583 int regulator_suspend_prepare(suspend_state_t state)
3585 struct regulator_dev *rdev;
3588 /* ON is handled by regulator active state */
3589 if (state == PM_SUSPEND_ON)
3592 mutex_lock(®ulator_list_mutex);
3593 list_for_each_entry(rdev, ®ulator_list, list) {
3595 mutex_lock(&rdev->mutex);
3596 ret = suspend_prepare(rdev, state);
3597 mutex_unlock(&rdev->mutex);
3600 rdev_err(rdev, "failed to prepare\n");
3605 mutex_unlock(®ulator_list_mutex);
3608 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3611 * regulator_suspend_finish - resume regulators from system wide suspend
3613 * Turn on regulators that might be turned off by regulator_suspend_prepare
3614 * and that should be turned on according to the regulators properties.
3616 int regulator_suspend_finish(void)
3618 struct regulator_dev *rdev;
3621 mutex_lock(®ulator_list_mutex);
3622 list_for_each_entry(rdev, ®ulator_list, list) {
3623 mutex_lock(&rdev->mutex);
3624 if (rdev->use_count > 0 || rdev->constraints->always_on) {
3625 error = _regulator_do_enable(rdev);
3629 if (!have_full_constraints())
3631 if (!_regulator_is_enabled(rdev))
3634 error = _regulator_do_disable(rdev);
3639 mutex_unlock(&rdev->mutex);
3641 mutex_unlock(®ulator_list_mutex);
3644 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3647 * regulator_has_full_constraints - the system has fully specified constraints
3649 * Calling this function will cause the regulator API to disable all
3650 * regulators which have a zero use count and don't have an always_on
3651 * constraint in a late_initcall.
3653 * The intention is that this will become the default behaviour in a
3654 * future kernel release so users are encouraged to use this facility
3657 void regulator_has_full_constraints(void)
3659 has_full_constraints = 1;
3661 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3664 * rdev_get_drvdata - get rdev regulator driver data
3667 * Get rdev regulator driver private data. This call can be used in the
3668 * regulator driver context.
3670 void *rdev_get_drvdata(struct regulator_dev *rdev)
3672 return rdev->reg_data;
3674 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3677 * regulator_get_drvdata - get regulator driver data
3678 * @regulator: regulator
3680 * Get regulator driver private data. This call can be used in the consumer
3681 * driver context when non API regulator specific functions need to be called.
3683 void *regulator_get_drvdata(struct regulator *regulator)
3685 return regulator->rdev->reg_data;
3687 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3690 * regulator_set_drvdata - set regulator driver data
3691 * @regulator: regulator
3694 void regulator_set_drvdata(struct regulator *regulator, void *data)
3696 regulator->rdev->reg_data = data;
3698 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3701 * regulator_get_id - get regulator ID
3704 int rdev_get_id(struct regulator_dev *rdev)
3706 return rdev->desc->id;
3708 EXPORT_SYMBOL_GPL(rdev_get_id);
3710 struct device *rdev_get_dev(struct regulator_dev *rdev)
3714 EXPORT_SYMBOL_GPL(rdev_get_dev);
3716 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3718 return reg_init_data->driver_data;
3720 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3722 #ifdef CONFIG_DEBUG_FS
3723 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3724 size_t count, loff_t *ppos)
3726 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3727 ssize_t len, ret = 0;
3728 struct regulator_map *map;
3733 list_for_each_entry(map, ®ulator_map_list, list) {
3734 len = snprintf(buf + ret, PAGE_SIZE - ret,
3736 rdev_get_name(map->regulator), map->dev_name,
3740 if (ret > PAGE_SIZE) {
3746 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3754 static const struct file_operations supply_map_fops = {
3755 #ifdef CONFIG_DEBUG_FS
3756 .read = supply_map_read_file,
3757 .llseek = default_llseek,
3761 static int __init regulator_init(void)
3765 ret = class_register(®ulator_class);
3767 debugfs_root = debugfs_create_dir("regulator", NULL);
3769 pr_warn("regulator: Failed to create debugfs directory\n");
3771 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3774 regulator_dummy_init();
3779 /* init early to allow our consumers to complete system booting */
3780 core_initcall(regulator_init);
3782 static int __init regulator_init_complete(void)
3784 struct regulator_dev *rdev;
3785 struct regulator_ops *ops;
3786 struct regulation_constraints *c;
3790 * Since DT doesn't provide an idiomatic mechanism for
3791 * enabling full constraints and since it's much more natural
3792 * with DT to provide them just assume that a DT enabled
3793 * system has full constraints.
3795 if (of_have_populated_dt())
3796 has_full_constraints = true;
3798 mutex_lock(®ulator_list_mutex);
3800 /* If we have a full configuration then disable any regulators
3801 * which are not in use or always_on. This will become the
3802 * default behaviour in the future.
3804 list_for_each_entry(rdev, ®ulator_list, list) {
3805 ops = rdev->desc->ops;
3806 c = rdev->constraints;
3808 if (c && c->always_on)
3811 mutex_lock(&rdev->mutex);
3813 if (rdev->use_count)
3816 /* If we can't read the status assume it's on. */
3817 if (ops->is_enabled)
3818 enabled = ops->is_enabled(rdev);
3825 if (have_full_constraints()) {
3826 /* We log since this may kill the system if it
3828 rdev_info(rdev, "disabling\n");
3829 ret = _regulator_do_disable(rdev);
3831 rdev_err(rdev, "couldn't disable: %d\n", ret);
3833 /* The intention is that in future we will
3834 * assume that full constraints are provided
3835 * so warn even if we aren't going to do
3838 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3842 mutex_unlock(&rdev->mutex);
3845 mutex_unlock(®ulator_list_mutex);
3849 late_initcall(regulator_init_complete);