2 * core.c -- Voltage/Current Regulator framework.
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 * Copyright 2008 SlimLogic Ltd.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/debugfs.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/async.h>
22 #include <linux/err.h>
23 #include <linux/mutex.h>
24 #include <linux/suspend.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/gpio/consumer.h>
29 #include <linux/regmap.h>
30 #include <linux/regulator/of_regulator.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/module.h>
36 #define CREATE_TRACE_POINTS
37 #include <trace/events/regulator.h>
42 #define rdev_crit(rdev, fmt, ...) \
43 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_err(rdev, fmt, ...) \
45 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_warn(rdev, fmt, ...) \
47 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48 #define rdev_info(rdev, fmt, ...) \
49 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50 #define rdev_dbg(rdev, fmt, ...) \
51 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
53 static DEFINE_MUTEX(regulator_list_mutex);
54 static LIST_HEAD(regulator_list);
55 static LIST_HEAD(regulator_map_list);
56 static LIST_HEAD(regulator_ena_gpio_list);
57 static LIST_HEAD(regulator_supply_alias_list);
58 static bool has_full_constraints;
60 static struct dentry *debugfs_root;
63 * struct regulator_map
65 * Used to provide symbolic supply names to devices.
67 struct regulator_map {
68 struct list_head list;
69 const char *dev_name; /* The dev_name() for the consumer */
71 struct regulator_dev *regulator;
75 * struct regulator_enable_gpio
77 * Management for shared enable GPIO pin
79 struct regulator_enable_gpio {
80 struct list_head list;
81 struct gpio_desc *gpiod;
82 u32 enable_count; /* a number of enabled shared GPIO */
83 u32 request_count; /* a number of requested shared GPIO */
84 unsigned int ena_gpio_invert:1;
88 * struct regulator_supply_alias
90 * Used to map lookups for a supply onto an alternative device.
92 struct regulator_supply_alias {
93 struct list_head list;
94 struct device *src_dev;
95 const char *src_supply;
96 struct device *alias_dev;
97 const char *alias_supply;
100 static int _regulator_is_enabled(struct regulator_dev *rdev);
101 static int _regulator_disable(struct regulator_dev *rdev);
102 static int _regulator_get_voltage(struct regulator_dev *rdev);
103 static int _regulator_get_current_limit(struct regulator_dev *rdev);
104 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
105 static int _notifier_call_chain(struct regulator_dev *rdev,
106 unsigned long event, void *data);
107 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
108 int min_uV, int max_uV);
109 static struct regulator *create_regulator(struct regulator_dev *rdev,
111 const char *supply_name);
113 static const char *rdev_get_name(struct regulator_dev *rdev)
115 if (rdev->constraints && rdev->constraints->name)
116 return rdev->constraints->name;
117 else if (rdev->desc->name)
118 return rdev->desc->name;
123 static bool have_full_constraints(void)
125 return has_full_constraints || of_have_populated_dt();
129 * of_get_regulator - get a regulator device node based on supply name
130 * @dev: Device pointer for the consumer (of regulator) device
131 * @supply: regulator supply name
133 * Extract the regulator device node corresponding to the supply name.
134 * returns the device node corresponding to the regulator if found, else
137 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
139 struct device_node *regnode = NULL;
140 char prop_name[32]; /* 32 is max size of property name */
142 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
144 snprintf(prop_name, 32, "%s-supply", supply);
145 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
148 dev_dbg(dev, "Looking up %s property in node %s failed",
149 prop_name, dev->of_node->full_name);
155 static int _regulator_can_change_status(struct regulator_dev *rdev)
157 if (!rdev->constraints)
160 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
166 /* Platform voltage constraint check */
167 static int regulator_check_voltage(struct regulator_dev *rdev,
168 int *min_uV, int *max_uV)
170 BUG_ON(*min_uV > *max_uV);
172 if (!rdev->constraints) {
173 rdev_err(rdev, "no constraints\n");
176 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
177 rdev_err(rdev, "operation not allowed\n");
181 if (*max_uV > rdev->constraints->max_uV)
182 *max_uV = rdev->constraints->max_uV;
183 if (*min_uV < rdev->constraints->min_uV)
184 *min_uV = rdev->constraints->min_uV;
186 if (*min_uV > *max_uV) {
187 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
195 /* Make sure we select a voltage that suits the needs of all
196 * regulator consumers
198 static int regulator_check_consumers(struct regulator_dev *rdev,
199 int *min_uV, int *max_uV)
201 struct regulator *regulator;
203 list_for_each_entry(regulator, &rdev->consumer_list, list) {
205 * Assume consumers that didn't say anything are OK
206 * with anything in the constraint range.
208 if (!regulator->min_uV && !regulator->max_uV)
211 if (*max_uV > regulator->max_uV)
212 *max_uV = regulator->max_uV;
213 if (*min_uV < regulator->min_uV)
214 *min_uV = regulator->min_uV;
217 if (*min_uV > *max_uV) {
218 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
226 /* current constraint check */
227 static int regulator_check_current_limit(struct regulator_dev *rdev,
228 int *min_uA, int *max_uA)
230 BUG_ON(*min_uA > *max_uA);
232 if (!rdev->constraints) {
233 rdev_err(rdev, "no constraints\n");
236 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
237 rdev_err(rdev, "operation not allowed\n");
241 if (*max_uA > rdev->constraints->max_uA)
242 *max_uA = rdev->constraints->max_uA;
243 if (*min_uA < rdev->constraints->min_uA)
244 *min_uA = rdev->constraints->min_uA;
246 if (*min_uA > *max_uA) {
247 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
255 /* operating mode constraint check */
256 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
259 case REGULATOR_MODE_FAST:
260 case REGULATOR_MODE_NORMAL:
261 case REGULATOR_MODE_IDLE:
262 case REGULATOR_MODE_STANDBY:
265 rdev_err(rdev, "invalid mode %x specified\n", *mode);
269 if (!rdev->constraints) {
270 rdev_err(rdev, "no constraints\n");
273 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
274 rdev_err(rdev, "operation not allowed\n");
278 /* The modes are bitmasks, the most power hungry modes having
279 * the lowest values. If the requested mode isn't supported
280 * try higher modes. */
282 if (rdev->constraints->valid_modes_mask & *mode)
290 /* dynamic regulator mode switching constraint check */
291 static int regulator_check_drms(struct regulator_dev *rdev)
293 if (!rdev->constraints) {
294 rdev_err(rdev, "no constraints\n");
297 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
298 rdev_err(rdev, "operation not allowed\n");
304 static ssize_t regulator_uV_show(struct device *dev,
305 struct device_attribute *attr, char *buf)
307 struct regulator_dev *rdev = dev_get_drvdata(dev);
310 mutex_lock(&rdev->mutex);
311 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
312 mutex_unlock(&rdev->mutex);
316 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
318 static ssize_t regulator_uA_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
321 struct regulator_dev *rdev = dev_get_drvdata(dev);
323 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
325 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
327 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
330 struct regulator_dev *rdev = dev_get_drvdata(dev);
332 return sprintf(buf, "%s\n", rdev_get_name(rdev));
334 static DEVICE_ATTR_RO(name);
336 static ssize_t regulator_print_opmode(char *buf, int mode)
339 case REGULATOR_MODE_FAST:
340 return sprintf(buf, "fast\n");
341 case REGULATOR_MODE_NORMAL:
342 return sprintf(buf, "normal\n");
343 case REGULATOR_MODE_IDLE:
344 return sprintf(buf, "idle\n");
345 case REGULATOR_MODE_STANDBY:
346 return sprintf(buf, "standby\n");
348 return sprintf(buf, "unknown\n");
351 static ssize_t regulator_opmode_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
354 struct regulator_dev *rdev = dev_get_drvdata(dev);
356 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
358 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
360 static ssize_t regulator_print_state(char *buf, int state)
363 return sprintf(buf, "enabled\n");
365 return sprintf(buf, "disabled\n");
367 return sprintf(buf, "unknown\n");
370 static ssize_t regulator_state_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
373 struct regulator_dev *rdev = dev_get_drvdata(dev);
376 mutex_lock(&rdev->mutex);
377 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
378 mutex_unlock(&rdev->mutex);
382 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
384 static ssize_t regulator_status_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
387 struct regulator_dev *rdev = dev_get_drvdata(dev);
391 status = rdev->desc->ops->get_status(rdev);
396 case REGULATOR_STATUS_OFF:
399 case REGULATOR_STATUS_ON:
402 case REGULATOR_STATUS_ERROR:
405 case REGULATOR_STATUS_FAST:
408 case REGULATOR_STATUS_NORMAL:
411 case REGULATOR_STATUS_IDLE:
414 case REGULATOR_STATUS_STANDBY:
417 case REGULATOR_STATUS_BYPASS:
420 case REGULATOR_STATUS_UNDEFINED:
427 return sprintf(buf, "%s\n", label);
429 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
431 static ssize_t regulator_min_uA_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
434 struct regulator_dev *rdev = dev_get_drvdata(dev);
436 if (!rdev->constraints)
437 return sprintf(buf, "constraint not defined\n");
439 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
441 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
443 static ssize_t regulator_max_uA_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
446 struct regulator_dev *rdev = dev_get_drvdata(dev);
448 if (!rdev->constraints)
449 return sprintf(buf, "constraint not defined\n");
451 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
453 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
455 static ssize_t regulator_min_uV_show(struct device *dev,
456 struct device_attribute *attr, char *buf)
458 struct regulator_dev *rdev = dev_get_drvdata(dev);
460 if (!rdev->constraints)
461 return sprintf(buf, "constraint not defined\n");
463 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
465 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
467 static ssize_t regulator_max_uV_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
470 struct regulator_dev *rdev = dev_get_drvdata(dev);
472 if (!rdev->constraints)
473 return sprintf(buf, "constraint not defined\n");
475 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
477 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
479 static ssize_t regulator_total_uA_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
482 struct regulator_dev *rdev = dev_get_drvdata(dev);
483 struct regulator *regulator;
486 mutex_lock(&rdev->mutex);
487 list_for_each_entry(regulator, &rdev->consumer_list, list)
488 uA += regulator->uA_load;
489 mutex_unlock(&rdev->mutex);
490 return sprintf(buf, "%d\n", uA);
492 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
494 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
497 struct regulator_dev *rdev = dev_get_drvdata(dev);
498 return sprintf(buf, "%d\n", rdev->use_count);
500 static DEVICE_ATTR_RO(num_users);
502 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
505 struct regulator_dev *rdev = dev_get_drvdata(dev);
507 switch (rdev->desc->type) {
508 case REGULATOR_VOLTAGE:
509 return sprintf(buf, "voltage\n");
510 case REGULATOR_CURRENT:
511 return sprintf(buf, "current\n");
513 return sprintf(buf, "unknown\n");
515 static DEVICE_ATTR_RO(type);
517 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
518 struct device_attribute *attr, char *buf)
520 struct regulator_dev *rdev = dev_get_drvdata(dev);
522 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
524 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
525 regulator_suspend_mem_uV_show, NULL);
527 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
528 struct device_attribute *attr, char *buf)
530 struct regulator_dev *rdev = dev_get_drvdata(dev);
532 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
534 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
535 regulator_suspend_disk_uV_show, NULL);
537 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
538 struct device_attribute *attr, char *buf)
540 struct regulator_dev *rdev = dev_get_drvdata(dev);
542 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
544 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
545 regulator_suspend_standby_uV_show, NULL);
547 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
550 struct regulator_dev *rdev = dev_get_drvdata(dev);
552 return regulator_print_opmode(buf,
553 rdev->constraints->state_mem.mode);
555 static DEVICE_ATTR(suspend_mem_mode, 0444,
556 regulator_suspend_mem_mode_show, NULL);
558 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
559 struct device_attribute *attr, char *buf)
561 struct regulator_dev *rdev = dev_get_drvdata(dev);
563 return regulator_print_opmode(buf,
564 rdev->constraints->state_disk.mode);
566 static DEVICE_ATTR(suspend_disk_mode, 0444,
567 regulator_suspend_disk_mode_show, NULL);
569 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
570 struct device_attribute *attr, char *buf)
572 struct regulator_dev *rdev = dev_get_drvdata(dev);
574 return regulator_print_opmode(buf,
575 rdev->constraints->state_standby.mode);
577 static DEVICE_ATTR(suspend_standby_mode, 0444,
578 regulator_suspend_standby_mode_show, NULL);
580 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
583 struct regulator_dev *rdev = dev_get_drvdata(dev);
585 return regulator_print_state(buf,
586 rdev->constraints->state_mem.enabled);
588 static DEVICE_ATTR(suspend_mem_state, 0444,
589 regulator_suspend_mem_state_show, NULL);
591 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
592 struct device_attribute *attr, char *buf)
594 struct regulator_dev *rdev = dev_get_drvdata(dev);
596 return regulator_print_state(buf,
597 rdev->constraints->state_disk.enabled);
599 static DEVICE_ATTR(suspend_disk_state, 0444,
600 regulator_suspend_disk_state_show, NULL);
602 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
605 struct regulator_dev *rdev = dev_get_drvdata(dev);
607 return regulator_print_state(buf,
608 rdev->constraints->state_standby.enabled);
610 static DEVICE_ATTR(suspend_standby_state, 0444,
611 regulator_suspend_standby_state_show, NULL);
613 static ssize_t regulator_bypass_show(struct device *dev,
614 struct device_attribute *attr, char *buf)
616 struct regulator_dev *rdev = dev_get_drvdata(dev);
621 ret = rdev->desc->ops->get_bypass(rdev, &bypass);
630 return sprintf(buf, "%s\n", report);
632 static DEVICE_ATTR(bypass, 0444,
633 regulator_bypass_show, NULL);
636 * These are the only attributes are present for all regulators.
637 * Other attributes are a function of regulator functionality.
639 static struct attribute *regulator_dev_attrs[] = {
641 &dev_attr_num_users.attr,
645 ATTRIBUTE_GROUPS(regulator_dev);
647 static void regulator_dev_release(struct device *dev)
649 struct regulator_dev *rdev = dev_get_drvdata(dev);
653 static struct class regulator_class = {
655 .dev_release = regulator_dev_release,
656 .dev_groups = regulator_dev_groups,
659 /* Calculate the new optimum regulator operating mode based on the new total
660 * consumer load. All locks held by caller */
661 static void drms_uA_update(struct regulator_dev *rdev)
663 struct regulator *sibling;
664 int current_uA = 0, output_uV, input_uV, err;
667 err = regulator_check_drms(rdev);
668 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
669 (!rdev->desc->ops->get_voltage &&
670 !rdev->desc->ops->get_voltage_sel) ||
671 !rdev->desc->ops->set_mode)
674 /* get output voltage */
675 output_uV = _regulator_get_voltage(rdev);
679 /* get input voltage */
682 input_uV = regulator_get_voltage(rdev->supply);
684 input_uV = rdev->constraints->input_uV;
688 /* calc total requested load */
689 list_for_each_entry(sibling, &rdev->consumer_list, list)
690 current_uA += sibling->uA_load;
692 /* now get the optimum mode for our new total regulator load */
693 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
694 output_uV, current_uA);
696 /* check the new mode is allowed */
697 err = regulator_mode_constrain(rdev, &mode);
699 rdev->desc->ops->set_mode(rdev, mode);
702 static int suspend_set_state(struct regulator_dev *rdev,
703 struct regulator_state *rstate)
707 /* If we have no suspend mode configration don't set anything;
708 * only warn if the driver implements set_suspend_voltage or
709 * set_suspend_mode callback.
711 if (!rstate->enabled && !rstate->disabled) {
712 if (rdev->desc->ops->set_suspend_voltage ||
713 rdev->desc->ops->set_suspend_mode)
714 rdev_warn(rdev, "No configuration\n");
718 if (rstate->enabled && rstate->disabled) {
719 rdev_err(rdev, "invalid configuration\n");
723 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
724 ret = rdev->desc->ops->set_suspend_enable(rdev);
725 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
726 ret = rdev->desc->ops->set_suspend_disable(rdev);
727 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
731 rdev_err(rdev, "failed to enabled/disable\n");
735 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
736 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
738 rdev_err(rdev, "failed to set voltage\n");
743 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
744 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
746 rdev_err(rdev, "failed to set mode\n");
753 /* locks held by caller */
754 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
756 if (!rdev->constraints)
760 case PM_SUSPEND_STANDBY:
761 return suspend_set_state(rdev,
762 &rdev->constraints->state_standby);
764 return suspend_set_state(rdev,
765 &rdev->constraints->state_mem);
767 return suspend_set_state(rdev,
768 &rdev->constraints->state_disk);
774 static void print_constraints(struct regulator_dev *rdev)
776 struct regulation_constraints *constraints = rdev->constraints;
781 if (constraints->min_uV && constraints->max_uV) {
782 if (constraints->min_uV == constraints->max_uV)
783 count += sprintf(buf + count, "%d mV ",
784 constraints->min_uV / 1000);
786 count += sprintf(buf + count, "%d <--> %d mV ",
787 constraints->min_uV / 1000,
788 constraints->max_uV / 1000);
791 if (!constraints->min_uV ||
792 constraints->min_uV != constraints->max_uV) {
793 ret = _regulator_get_voltage(rdev);
795 count += sprintf(buf + count, "at %d mV ", ret / 1000);
798 if (constraints->uV_offset)
799 count += sprintf(buf, "%dmV offset ",
800 constraints->uV_offset / 1000);
802 if (constraints->min_uA && constraints->max_uA) {
803 if (constraints->min_uA == constraints->max_uA)
804 count += sprintf(buf + count, "%d mA ",
805 constraints->min_uA / 1000);
807 count += sprintf(buf + count, "%d <--> %d mA ",
808 constraints->min_uA / 1000,
809 constraints->max_uA / 1000);
812 if (!constraints->min_uA ||
813 constraints->min_uA != constraints->max_uA) {
814 ret = _regulator_get_current_limit(rdev);
816 count += sprintf(buf + count, "at %d mA ", ret / 1000);
819 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
820 count += sprintf(buf + count, "fast ");
821 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
822 count += sprintf(buf + count, "normal ");
823 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
824 count += sprintf(buf + count, "idle ");
825 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
826 count += sprintf(buf + count, "standby");
829 sprintf(buf, "no parameters");
831 rdev_dbg(rdev, "%s\n", buf);
833 if ((constraints->min_uV != constraints->max_uV) &&
834 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
836 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
839 static int machine_constraints_voltage(struct regulator_dev *rdev,
840 struct regulation_constraints *constraints)
842 const struct regulator_ops *ops = rdev->desc->ops;
845 /* do we need to apply the constraint voltage */
846 if (rdev->constraints->apply_uV &&
847 rdev->constraints->min_uV == rdev->constraints->max_uV) {
848 int current_uV = _regulator_get_voltage(rdev);
849 if (current_uV < 0) {
851 "failed to get the current voltage(%d)\n",
855 if (current_uV < rdev->constraints->min_uV ||
856 current_uV > rdev->constraints->max_uV) {
857 ret = _regulator_do_set_voltage(
858 rdev, rdev->constraints->min_uV,
859 rdev->constraints->max_uV);
862 "failed to apply %duV constraint(%d)\n",
863 rdev->constraints->min_uV, ret);
869 /* constrain machine-level voltage specs to fit
870 * the actual range supported by this regulator.
872 if (ops->list_voltage && rdev->desc->n_voltages) {
873 int count = rdev->desc->n_voltages;
875 int min_uV = INT_MAX;
876 int max_uV = INT_MIN;
877 int cmin = constraints->min_uV;
878 int cmax = constraints->max_uV;
880 /* it's safe to autoconfigure fixed-voltage supplies
881 and the constraints are used by list_voltage. */
882 if (count == 1 && !cmin) {
885 constraints->min_uV = cmin;
886 constraints->max_uV = cmax;
889 /* voltage constraints are optional */
890 if ((cmin == 0) && (cmax == 0))
893 /* else require explicit machine-level constraints */
894 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
895 rdev_err(rdev, "invalid voltage constraints\n");
899 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
900 for (i = 0; i < count; i++) {
903 value = ops->list_voltage(rdev, i);
907 /* maybe adjust [min_uV..max_uV] */
908 if (value >= cmin && value < min_uV)
910 if (value <= cmax && value > max_uV)
914 /* final: [min_uV..max_uV] valid iff constraints valid */
915 if (max_uV < min_uV) {
917 "unsupportable voltage constraints %u-%uuV\n",
922 /* use regulator's subset of machine constraints */
923 if (constraints->min_uV < min_uV) {
924 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
925 constraints->min_uV, min_uV);
926 constraints->min_uV = min_uV;
928 if (constraints->max_uV > max_uV) {
929 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
930 constraints->max_uV, max_uV);
931 constraints->max_uV = max_uV;
938 static int machine_constraints_current(struct regulator_dev *rdev,
939 struct regulation_constraints *constraints)
941 const struct regulator_ops *ops = rdev->desc->ops;
944 if (!constraints->min_uA && !constraints->max_uA)
947 if (constraints->min_uA > constraints->max_uA) {
948 rdev_err(rdev, "Invalid current constraints\n");
952 if (!ops->set_current_limit || !ops->get_current_limit) {
953 rdev_warn(rdev, "Operation of current configuration missing\n");
957 /* Set regulator current in constraints range */
958 ret = ops->set_current_limit(rdev, constraints->min_uA,
959 constraints->max_uA);
961 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
968 static int _regulator_do_enable(struct regulator_dev *rdev);
971 * set_machine_constraints - sets regulator constraints
972 * @rdev: regulator source
973 * @constraints: constraints to apply
975 * Allows platform initialisation code to define and constrain
976 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
977 * Constraints *must* be set by platform code in order for some
978 * regulator operations to proceed i.e. set_voltage, set_current_limit,
981 static int set_machine_constraints(struct regulator_dev *rdev,
982 const struct regulation_constraints *constraints)
985 const struct regulator_ops *ops = rdev->desc->ops;
988 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
991 rdev->constraints = kzalloc(sizeof(*constraints),
993 if (!rdev->constraints)
996 ret = machine_constraints_voltage(rdev, rdev->constraints);
1000 ret = machine_constraints_current(rdev, rdev->constraints);
1004 /* do we need to setup our suspend state */
1005 if (rdev->constraints->initial_state) {
1006 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1008 rdev_err(rdev, "failed to set suspend state\n");
1013 if (rdev->constraints->initial_mode) {
1014 if (!ops->set_mode) {
1015 rdev_err(rdev, "no set_mode operation\n");
1020 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1022 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1027 /* If the constraints say the regulator should be on at this point
1028 * and we have control then make sure it is enabled.
1030 if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1031 ret = _regulator_do_enable(rdev);
1032 if (ret < 0 && ret != -EINVAL) {
1033 rdev_err(rdev, "failed to enable\n");
1038 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1039 && ops->set_ramp_delay) {
1040 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1042 rdev_err(rdev, "failed to set ramp_delay\n");
1047 print_constraints(rdev);
1050 kfree(rdev->constraints);
1051 rdev->constraints = NULL;
1056 * set_supply - set regulator supply regulator
1057 * @rdev: regulator name
1058 * @supply_rdev: supply regulator name
1060 * Called by platform initialisation code to set the supply regulator for this
1061 * regulator. This ensures that a regulators supply will also be enabled by the
1062 * core if it's child is enabled.
1064 static int set_supply(struct regulator_dev *rdev,
1065 struct regulator_dev *supply_rdev)
1069 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1071 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1072 if (rdev->supply == NULL) {
1076 supply_rdev->open_count++;
1082 * set_consumer_device_supply - Bind a regulator to a symbolic supply
1083 * @rdev: regulator source
1084 * @consumer_dev_name: dev_name() string for device supply applies to
1085 * @supply: symbolic name for supply
1087 * Allows platform initialisation code to map physical regulator
1088 * sources to symbolic names for supplies for use by devices. Devices
1089 * should use these symbolic names to request regulators, avoiding the
1090 * need to provide board-specific regulator names as platform data.
1092 static int set_consumer_device_supply(struct regulator_dev *rdev,
1093 const char *consumer_dev_name,
1096 struct regulator_map *node;
1102 if (consumer_dev_name != NULL)
1107 list_for_each_entry(node, ®ulator_map_list, list) {
1108 if (node->dev_name && consumer_dev_name) {
1109 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1111 } else if (node->dev_name || consumer_dev_name) {
1115 if (strcmp(node->supply, supply) != 0)
1118 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1120 dev_name(&node->regulator->dev),
1121 node->regulator->desc->name,
1123 dev_name(&rdev->dev), rdev_get_name(rdev));
1127 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1131 node->regulator = rdev;
1132 node->supply = supply;
1135 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1136 if (node->dev_name == NULL) {
1142 list_add(&node->list, ®ulator_map_list);
1146 static void unset_regulator_supplies(struct regulator_dev *rdev)
1148 struct regulator_map *node, *n;
1150 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1151 if (rdev == node->regulator) {
1152 list_del(&node->list);
1153 kfree(node->dev_name);
1159 #define REG_STR_SIZE 64
1161 static struct regulator *create_regulator(struct regulator_dev *rdev,
1163 const char *supply_name)
1165 struct regulator *regulator;
1166 char buf[REG_STR_SIZE];
1169 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1170 if (regulator == NULL)
1173 mutex_lock(&rdev->mutex);
1174 regulator->rdev = rdev;
1175 list_add(®ulator->list, &rdev->consumer_list);
1178 regulator->dev = dev;
1180 /* Add a link to the device sysfs entry */
1181 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1182 dev->kobj.name, supply_name);
1183 if (size >= REG_STR_SIZE)
1186 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1187 if (regulator->supply_name == NULL)
1190 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1193 rdev_warn(rdev, "could not add device link %s err %d\n",
1194 dev->kobj.name, err);
1198 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1199 if (regulator->supply_name == NULL)
1203 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1205 if (!regulator->debugfs) {
1206 rdev_warn(rdev, "Failed to create debugfs directory\n");
1208 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1209 ®ulator->uA_load);
1210 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1211 ®ulator->min_uV);
1212 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1213 ®ulator->max_uV);
1217 * Check now if the regulator is an always on regulator - if
1218 * it is then we don't need to do nearly so much work for
1219 * enable/disable calls.
1221 if (!_regulator_can_change_status(rdev) &&
1222 _regulator_is_enabled(rdev))
1223 regulator->always_on = true;
1225 mutex_unlock(&rdev->mutex);
1228 list_del(®ulator->list);
1230 mutex_unlock(&rdev->mutex);
1234 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1236 if (rdev->constraints && rdev->constraints->enable_time)
1237 return rdev->constraints->enable_time;
1238 if (!rdev->desc->ops->enable_time)
1239 return rdev->desc->enable_time;
1240 return rdev->desc->ops->enable_time(rdev);
1243 static struct regulator_supply_alias *regulator_find_supply_alias(
1244 struct device *dev, const char *supply)
1246 struct regulator_supply_alias *map;
1248 list_for_each_entry(map, ®ulator_supply_alias_list, list)
1249 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1255 static void regulator_supply_alias(struct device **dev, const char **supply)
1257 struct regulator_supply_alias *map;
1259 map = regulator_find_supply_alias(*dev, *supply);
1261 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1262 *supply, map->alias_supply,
1263 dev_name(map->alias_dev));
1264 *dev = map->alias_dev;
1265 *supply = map->alias_supply;
1269 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1273 struct regulator_dev *r;
1274 struct device_node *node;
1275 struct regulator_map *map;
1276 const char *devname = NULL;
1278 regulator_supply_alias(&dev, &supply);
1280 /* first do a dt based lookup */
1281 if (dev && dev->of_node) {
1282 node = of_get_regulator(dev, supply);
1284 list_for_each_entry(r, ®ulator_list, list)
1285 if (r->dev.parent &&
1286 node == r->dev.of_node)
1288 *ret = -EPROBE_DEFER;
1292 * If we couldn't even get the node then it's
1293 * not just that the device didn't register
1294 * yet, there's no node and we'll never
1301 /* if not found, try doing it non-dt way */
1303 devname = dev_name(dev);
1305 list_for_each_entry(r, ®ulator_list, list)
1306 if (strcmp(rdev_get_name(r), supply) == 0)
1309 list_for_each_entry(map, ®ulator_map_list, list) {
1310 /* If the mapping has a device set up it must match */
1311 if (map->dev_name &&
1312 (!devname || strcmp(map->dev_name, devname)))
1315 if (strcmp(map->supply, supply) == 0)
1316 return map->regulator;
1323 /* Internal regulator request function */
1324 static struct regulator *_regulator_get(struct device *dev, const char *id,
1325 bool exclusive, bool allow_dummy)
1327 struct regulator_dev *rdev;
1328 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1329 const char *devname = NULL;
1333 pr_err("get() with no identifier\n");
1334 return ERR_PTR(-EINVAL);
1338 devname = dev_name(dev);
1340 if (have_full_constraints())
1343 ret = -EPROBE_DEFER;
1345 mutex_lock(®ulator_list_mutex);
1347 rdev = regulator_dev_lookup(dev, id, &ret);
1351 regulator = ERR_PTR(ret);
1354 * If we have return value from dev_lookup fail, we do not expect to
1355 * succeed, so, quit with appropriate error value
1357 if (ret && ret != -ENODEV)
1361 devname = "deviceless";
1364 * Assume that a regulator is physically present and enabled
1365 * even if it isn't hooked up and just provide a dummy.
1367 if (have_full_constraints() && allow_dummy) {
1368 pr_warn("%s supply %s not found, using dummy regulator\n",
1371 rdev = dummy_regulator_rdev;
1373 /* Don't log an error when called from regulator_get_optional() */
1374 } else if (!have_full_constraints() || exclusive) {
1375 dev_warn(dev, "dummy supplies not allowed\n");
1378 mutex_unlock(®ulator_list_mutex);
1382 if (rdev->exclusive) {
1383 regulator = ERR_PTR(-EPERM);
1387 if (exclusive && rdev->open_count) {
1388 regulator = ERR_PTR(-EBUSY);
1392 if (!try_module_get(rdev->owner))
1395 regulator = create_regulator(rdev, dev, id);
1396 if (regulator == NULL) {
1397 regulator = ERR_PTR(-ENOMEM);
1398 module_put(rdev->owner);
1404 rdev->exclusive = 1;
1406 ret = _regulator_is_enabled(rdev);
1408 rdev->use_count = 1;
1410 rdev->use_count = 0;
1414 mutex_unlock(®ulator_list_mutex);
1420 * regulator_get - lookup and obtain a reference 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.
1427 * Use of supply names configured via regulator_set_device_supply() is
1428 * strongly encouraged. It is recommended that the supply name used
1429 * should match the name used for the supply and/or the relevant
1430 * device pins in the datasheet.
1432 struct regulator *regulator_get(struct device *dev, const char *id)
1434 return _regulator_get(dev, id, false, true);
1436 EXPORT_SYMBOL_GPL(regulator_get);
1439 * regulator_get_exclusive - obtain exclusive access to a regulator.
1440 * @dev: device for regulator "consumer"
1441 * @id: Supply name or regulator ID.
1443 * Returns a struct regulator corresponding to the regulator producer,
1444 * or IS_ERR() condition containing errno. Other consumers will be
1445 * unable to obtain this regulator while this reference is held and the
1446 * use count for the regulator will be initialised to reflect the current
1447 * state of the regulator.
1449 * This is intended for use by consumers which cannot tolerate shared
1450 * use of the regulator such as those which need to force the
1451 * regulator off for correct operation of the hardware they are
1454 * Use of supply names configured via regulator_set_device_supply() is
1455 * strongly encouraged. It is recommended that the supply name used
1456 * should match the name used for the supply and/or the relevant
1457 * device pins in the datasheet.
1459 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1461 return _regulator_get(dev, id, true, false);
1463 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1466 * regulator_get_optional - obtain optional access to a regulator.
1467 * @dev: device for regulator "consumer"
1468 * @id: Supply name or regulator ID.
1470 * Returns a struct regulator corresponding to the regulator producer,
1471 * or IS_ERR() condition containing errno.
1473 * This is intended for use by consumers for devices which can have
1474 * some supplies unconnected in normal use, such as some MMC devices.
1475 * It can allow the regulator core to provide stub supplies for other
1476 * supplies requested using normal regulator_get() calls without
1477 * disrupting the operation of drivers that can handle absent
1480 * Use of supply names configured via regulator_set_device_supply() is
1481 * strongly encouraged. It is recommended that the supply name used
1482 * should match the name used for the supply and/or the relevant
1483 * device pins in the datasheet.
1485 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1487 return _regulator_get(dev, id, false, false);
1489 EXPORT_SYMBOL_GPL(regulator_get_optional);
1491 /* Locks held by regulator_put() */
1492 static void _regulator_put(struct regulator *regulator)
1494 struct regulator_dev *rdev;
1496 if (regulator == NULL || IS_ERR(regulator))
1499 rdev = regulator->rdev;
1501 debugfs_remove_recursive(regulator->debugfs);
1503 /* remove any sysfs entries */
1505 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1506 kfree(regulator->supply_name);
1507 list_del(®ulator->list);
1511 rdev->exclusive = 0;
1513 module_put(rdev->owner);
1517 * regulator_put - "free" the regulator source
1518 * @regulator: regulator source
1520 * Note: drivers must ensure that all regulator_enable calls made on this
1521 * regulator source are balanced by regulator_disable calls prior to calling
1524 void regulator_put(struct regulator *regulator)
1526 mutex_lock(®ulator_list_mutex);
1527 _regulator_put(regulator);
1528 mutex_unlock(®ulator_list_mutex);
1530 EXPORT_SYMBOL_GPL(regulator_put);
1533 * regulator_register_supply_alias - Provide device alias for supply lookup
1535 * @dev: device that will be given as the regulator "consumer"
1536 * @id: Supply name or regulator ID
1537 * @alias_dev: device that should be used to lookup the supply
1538 * @alias_id: Supply name or regulator ID that should be used to lookup the
1541 * All lookups for id on dev will instead be conducted for alias_id on
1544 int regulator_register_supply_alias(struct device *dev, const char *id,
1545 struct device *alias_dev,
1546 const char *alias_id)
1548 struct regulator_supply_alias *map;
1550 map = regulator_find_supply_alias(dev, id);
1554 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1559 map->src_supply = id;
1560 map->alias_dev = alias_dev;
1561 map->alias_supply = alias_id;
1563 list_add(&map->list, ®ulator_supply_alias_list);
1565 pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1566 id, dev_name(dev), alias_id, dev_name(alias_dev));
1570 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1573 * regulator_unregister_supply_alias - Remove device alias
1575 * @dev: device that will be given as the regulator "consumer"
1576 * @id: Supply name or regulator ID
1578 * Remove a lookup alias if one exists for id on dev.
1580 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1582 struct regulator_supply_alias *map;
1584 map = regulator_find_supply_alias(dev, id);
1586 list_del(&map->list);
1590 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1593 * regulator_bulk_register_supply_alias - register multiple aliases
1595 * @dev: device that will be given as the regulator "consumer"
1596 * @id: List of supply names or regulator IDs
1597 * @alias_dev: device that should be used to lookup the supply
1598 * @alias_id: List of supply names or regulator IDs that should be used to
1600 * @num_id: Number of aliases to register
1602 * @return 0 on success, an errno on failure.
1604 * This helper function allows drivers to register several supply
1605 * aliases in one operation. If any of the aliases cannot be
1606 * registered any aliases that were registered will be removed
1607 * before returning to the caller.
1609 int regulator_bulk_register_supply_alias(struct device *dev,
1610 const char *const *id,
1611 struct device *alias_dev,
1612 const char *const *alias_id,
1618 for (i = 0; i < num_id; ++i) {
1619 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1629 "Failed to create supply alias %s,%s -> %s,%s\n",
1630 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1633 regulator_unregister_supply_alias(dev, id[i]);
1637 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1640 * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1642 * @dev: device that will be given as the regulator "consumer"
1643 * @id: List of supply names or regulator IDs
1644 * @num_id: Number of aliases to unregister
1646 * This helper function allows drivers to unregister several supply
1647 * aliases in one operation.
1649 void regulator_bulk_unregister_supply_alias(struct device *dev,
1650 const char *const *id,
1655 for (i = 0; i < num_id; ++i)
1656 regulator_unregister_supply_alias(dev, id[i]);
1658 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1661 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1662 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1663 const struct regulator_config *config)
1665 struct regulator_enable_gpio *pin;
1666 struct gpio_desc *gpiod;
1669 gpiod = gpio_to_desc(config->ena_gpio);
1671 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
1672 if (pin->gpiod == gpiod) {
1673 rdev_dbg(rdev, "GPIO %d is already used\n",
1675 goto update_ena_gpio_to_rdev;
1679 ret = gpio_request_one(config->ena_gpio,
1680 GPIOF_DIR_OUT | config->ena_gpio_flags,
1681 rdev_get_name(rdev));
1685 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1687 gpio_free(config->ena_gpio);
1692 pin->ena_gpio_invert = config->ena_gpio_invert;
1693 list_add(&pin->list, ®ulator_ena_gpio_list);
1695 update_ena_gpio_to_rdev:
1696 pin->request_count++;
1697 rdev->ena_pin = pin;
1701 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1703 struct regulator_enable_gpio *pin, *n;
1708 /* Free the GPIO only in case of no use */
1709 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
1710 if (pin->gpiod == rdev->ena_pin->gpiod) {
1711 if (pin->request_count <= 1) {
1712 pin->request_count = 0;
1713 gpiod_put(pin->gpiod);
1714 list_del(&pin->list);
1716 rdev->ena_pin = NULL;
1719 pin->request_count--;
1726 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1727 * @rdev: regulator_dev structure
1728 * @enable: enable GPIO at initial use?
1730 * GPIO is enabled in case of initial use. (enable_count is 0)
1731 * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1733 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1735 struct regulator_enable_gpio *pin = rdev->ena_pin;
1741 /* Enable GPIO at initial use */
1742 if (pin->enable_count == 0)
1743 gpiod_set_value_cansleep(pin->gpiod,
1744 !pin->ena_gpio_invert);
1746 pin->enable_count++;
1748 if (pin->enable_count > 1) {
1749 pin->enable_count--;
1753 /* Disable GPIO if not used */
1754 if (pin->enable_count <= 1) {
1755 gpiod_set_value_cansleep(pin->gpiod,
1756 pin->ena_gpio_invert);
1757 pin->enable_count = 0;
1765 * _regulator_enable_delay - a delay helper function
1766 * @delay: time to delay in microseconds
1768 * Delay for the requested amount of time as per the guidelines in:
1770 * Documentation/timers/timers-howto.txt
1772 * The assumption here is that regulators will never be enabled in
1773 * atomic context and therefore sleeping functions can be used.
1775 static void _regulator_enable_delay(unsigned int delay)
1777 unsigned int ms = delay / 1000;
1778 unsigned int us = delay % 1000;
1782 * For small enough values, handle super-millisecond
1783 * delays in the usleep_range() call below.
1792 * Give the scheduler some room to coalesce with any other
1793 * wakeup sources. For delays shorter than 10 us, don't even
1794 * bother setting up high-resolution timers and just busy-
1798 usleep_range(us, us + 100);
1803 static int _regulator_do_enable(struct regulator_dev *rdev)
1807 /* Query before enabling in case configuration dependent. */
1808 ret = _regulator_get_enable_time(rdev);
1812 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1816 trace_regulator_enable(rdev_get_name(rdev));
1818 if (rdev->desc->off_on_delay) {
1819 /* if needed, keep a distance of off_on_delay from last time
1820 * this regulator was disabled.
1822 unsigned long start_jiffy = jiffies;
1823 unsigned long intended, max_delay, remaining;
1825 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1826 intended = rdev->last_off_jiffy + max_delay;
1828 if (time_before(start_jiffy, intended)) {
1829 /* calc remaining jiffies to deal with one-time
1831 * in case of multiple timer wrapping, either it can be
1832 * detected by out-of-range remaining, or it cannot be
1833 * detected and we gets a panelty of
1834 * _regulator_enable_delay().
1836 remaining = intended - start_jiffy;
1837 if (remaining <= max_delay)
1838 _regulator_enable_delay(
1839 jiffies_to_usecs(remaining));
1843 if (rdev->ena_pin) {
1844 ret = regulator_ena_gpio_ctrl(rdev, true);
1847 rdev->ena_gpio_state = 1;
1848 } else if (rdev->desc->ops->enable) {
1849 ret = rdev->desc->ops->enable(rdev);
1856 /* Allow the regulator to ramp; it would be useful to extend
1857 * this for bulk operations so that the regulators can ramp
1859 trace_regulator_enable_delay(rdev_get_name(rdev));
1861 _regulator_enable_delay(delay);
1863 trace_regulator_enable_complete(rdev_get_name(rdev));
1868 /* locks held by regulator_enable() */
1869 static int _regulator_enable(struct regulator_dev *rdev)
1873 /* check voltage and requested load before enabling */
1874 if (rdev->constraints &&
1875 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1876 drms_uA_update(rdev);
1878 if (rdev->use_count == 0) {
1879 /* The regulator may on if it's not switchable or left on */
1880 ret = _regulator_is_enabled(rdev);
1881 if (ret == -EINVAL || ret == 0) {
1882 if (!_regulator_can_change_status(rdev))
1885 ret = _regulator_do_enable(rdev);
1889 } else if (ret < 0) {
1890 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1893 /* Fallthrough on positive return values - already enabled */
1902 * regulator_enable - enable regulator output
1903 * @regulator: regulator source
1905 * Request that the regulator be enabled with the regulator output at
1906 * the predefined voltage or current value. Calls to regulator_enable()
1907 * must be balanced with calls to regulator_disable().
1909 * NOTE: the output value can be set by other drivers, boot loader or may be
1910 * hardwired in the regulator.
1912 int regulator_enable(struct regulator *regulator)
1914 struct regulator_dev *rdev = regulator->rdev;
1917 if (regulator->always_on)
1921 ret = regulator_enable(rdev->supply);
1926 mutex_lock(&rdev->mutex);
1927 ret = _regulator_enable(rdev);
1928 mutex_unlock(&rdev->mutex);
1930 if (ret != 0 && rdev->supply)
1931 regulator_disable(rdev->supply);
1935 EXPORT_SYMBOL_GPL(regulator_enable);
1937 static int _regulator_do_disable(struct regulator_dev *rdev)
1941 trace_regulator_disable(rdev_get_name(rdev));
1943 if (rdev->ena_pin) {
1944 ret = regulator_ena_gpio_ctrl(rdev, false);
1947 rdev->ena_gpio_state = 0;
1949 } else if (rdev->desc->ops->disable) {
1950 ret = rdev->desc->ops->disable(rdev);
1955 /* cares about last_off_jiffy only if off_on_delay is required by
1958 if (rdev->desc->off_on_delay)
1959 rdev->last_off_jiffy = jiffies;
1961 trace_regulator_disable_complete(rdev_get_name(rdev));
1966 /* locks held by regulator_disable() */
1967 static int _regulator_disable(struct regulator_dev *rdev)
1971 if (WARN(rdev->use_count <= 0,
1972 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1975 /* are we the last user and permitted to disable ? */
1976 if (rdev->use_count == 1 &&
1977 (rdev->constraints && !rdev->constraints->always_on)) {
1979 /* we are last user */
1980 if (_regulator_can_change_status(rdev)) {
1981 ret = _regulator_do_disable(rdev);
1983 rdev_err(rdev, "failed to disable\n");
1986 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1990 rdev->use_count = 0;
1991 } else if (rdev->use_count > 1) {
1993 if (rdev->constraints &&
1994 (rdev->constraints->valid_ops_mask &
1995 REGULATOR_CHANGE_DRMS))
1996 drms_uA_update(rdev);
2005 * regulator_disable - disable regulator output
2006 * @regulator: regulator source
2008 * Disable the regulator output voltage or current. Calls to
2009 * regulator_enable() must be balanced with calls to
2010 * regulator_disable().
2012 * NOTE: this will only disable the regulator output if no other consumer
2013 * devices have it enabled, the regulator device supports disabling and
2014 * machine constraints permit this operation.
2016 int regulator_disable(struct regulator *regulator)
2018 struct regulator_dev *rdev = regulator->rdev;
2021 if (regulator->always_on)
2024 mutex_lock(&rdev->mutex);
2025 ret = _regulator_disable(rdev);
2026 mutex_unlock(&rdev->mutex);
2028 if (ret == 0 && rdev->supply)
2029 regulator_disable(rdev->supply);
2033 EXPORT_SYMBOL_GPL(regulator_disable);
2035 /* locks held by regulator_force_disable() */
2036 static int _regulator_force_disable(struct regulator_dev *rdev)
2040 ret = _regulator_do_disable(rdev);
2042 rdev_err(rdev, "failed to force disable\n");
2046 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2047 REGULATOR_EVENT_DISABLE, NULL);
2053 * regulator_force_disable - force disable regulator output
2054 * @regulator: regulator source
2056 * Forcibly disable the regulator output voltage or current.
2057 * NOTE: this *will* disable the regulator output even if other consumer
2058 * devices have it enabled. This should be used for situations when device
2059 * damage will likely occur if the regulator is not disabled (e.g. over temp).
2061 int regulator_force_disable(struct regulator *regulator)
2063 struct regulator_dev *rdev = regulator->rdev;
2066 mutex_lock(&rdev->mutex);
2067 regulator->uA_load = 0;
2068 ret = _regulator_force_disable(regulator->rdev);
2069 mutex_unlock(&rdev->mutex);
2072 while (rdev->open_count--)
2073 regulator_disable(rdev->supply);
2077 EXPORT_SYMBOL_GPL(regulator_force_disable);
2079 static void regulator_disable_work(struct work_struct *work)
2081 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2085 mutex_lock(&rdev->mutex);
2087 BUG_ON(!rdev->deferred_disables);
2089 count = rdev->deferred_disables;
2090 rdev->deferred_disables = 0;
2092 for (i = 0; i < count; i++) {
2093 ret = _regulator_disable(rdev);
2095 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2098 mutex_unlock(&rdev->mutex);
2101 for (i = 0; i < count; i++) {
2102 ret = regulator_disable(rdev->supply);
2105 "Supply disable failed: %d\n", ret);
2112 * regulator_disable_deferred - disable regulator output with delay
2113 * @regulator: regulator source
2114 * @ms: miliseconds until the regulator is disabled
2116 * Execute regulator_disable() on the regulator after a delay. This
2117 * is intended for use with devices that require some time to quiesce.
2119 * NOTE: this will only disable the regulator output if no other consumer
2120 * devices have it enabled, the regulator device supports disabling and
2121 * machine constraints permit this operation.
2123 int regulator_disable_deferred(struct regulator *regulator, int ms)
2125 struct regulator_dev *rdev = regulator->rdev;
2128 if (regulator->always_on)
2132 return regulator_disable(regulator);
2134 mutex_lock(&rdev->mutex);
2135 rdev->deferred_disables++;
2136 mutex_unlock(&rdev->mutex);
2138 ret = queue_delayed_work(system_power_efficient_wq,
2139 &rdev->disable_work,
2140 msecs_to_jiffies(ms));
2146 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2148 static int _regulator_is_enabled(struct regulator_dev *rdev)
2150 /* A GPIO control always takes precedence */
2152 return rdev->ena_gpio_state;
2154 /* If we don't know then assume that the regulator is always on */
2155 if (!rdev->desc->ops->is_enabled)
2158 return rdev->desc->ops->is_enabled(rdev);
2162 * regulator_is_enabled - is the regulator output enabled
2163 * @regulator: regulator source
2165 * Returns positive if the regulator driver backing the source/client
2166 * has requested that the device be enabled, zero if it hasn't, else a
2167 * negative errno code.
2169 * Note that the device backing this regulator handle can have multiple
2170 * users, so it might be enabled even if regulator_enable() was never
2171 * called for this particular source.
2173 int regulator_is_enabled(struct regulator *regulator)
2177 if (regulator->always_on)
2180 mutex_lock(®ulator->rdev->mutex);
2181 ret = _regulator_is_enabled(regulator->rdev);
2182 mutex_unlock(®ulator->rdev->mutex);
2186 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2189 * regulator_can_change_voltage - check if regulator can change voltage
2190 * @regulator: regulator source
2192 * Returns positive if the regulator driver backing the source/client
2193 * can change its voltage, false otherwise. Useful for detecting fixed
2194 * or dummy regulators and disabling voltage change logic in the client
2197 int regulator_can_change_voltage(struct regulator *regulator)
2199 struct regulator_dev *rdev = regulator->rdev;
2201 if (rdev->constraints &&
2202 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2203 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2206 if (rdev->desc->continuous_voltage_range &&
2207 rdev->constraints->min_uV && rdev->constraints->max_uV &&
2208 rdev->constraints->min_uV != rdev->constraints->max_uV)
2214 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2217 * regulator_count_voltages - count regulator_list_voltage() selectors
2218 * @regulator: regulator source
2220 * Returns number of selectors, or negative errno. Selectors are
2221 * numbered starting at zero, and typically correspond to bitfields
2222 * in hardware registers.
2224 int regulator_count_voltages(struct regulator *regulator)
2226 struct regulator_dev *rdev = regulator->rdev;
2228 if (rdev->desc->n_voltages)
2229 return rdev->desc->n_voltages;
2234 return regulator_count_voltages(rdev->supply);
2236 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2239 * regulator_list_voltage - enumerate supported voltages
2240 * @regulator: regulator source
2241 * @selector: identify voltage to list
2242 * Context: can sleep
2244 * Returns a voltage that can be passed to @regulator_set_voltage(),
2245 * zero if this selector code can't be used on this system, or a
2248 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2250 struct regulator_dev *rdev = regulator->rdev;
2251 const struct regulator_ops *ops = rdev->desc->ops;
2254 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2255 return rdev->desc->fixed_uV;
2257 if (ops->list_voltage) {
2258 if (selector >= rdev->desc->n_voltages)
2260 mutex_lock(&rdev->mutex);
2261 ret = ops->list_voltage(rdev, selector);
2262 mutex_unlock(&rdev->mutex);
2263 } else if (rdev->supply) {
2264 ret = regulator_list_voltage(rdev->supply, selector);
2270 if (ret < rdev->constraints->min_uV)
2272 else if (ret > rdev->constraints->max_uV)
2278 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2281 * regulator_get_regmap - get the regulator's register map
2282 * @regulator: regulator source
2284 * Returns the register map for the given regulator, or an ERR_PTR value
2285 * if the regulator doesn't use regmap.
2287 struct regmap *regulator_get_regmap(struct regulator *regulator)
2289 struct regmap *map = regulator->rdev->regmap;
2291 return map ? map : ERR_PTR(-EOPNOTSUPP);
2295 * regulator_get_hardware_vsel_register - get the HW voltage selector register
2296 * @regulator: regulator source
2297 * @vsel_reg: voltage selector register, output parameter
2298 * @vsel_mask: mask for voltage selector bitfield, output parameter
2300 * Returns the hardware register offset and bitmask used for setting the
2301 * regulator voltage. This might be useful when configuring voltage-scaling
2302 * hardware or firmware that can make I2C requests behind the kernel's back,
2305 * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2306 * and 0 is returned, otherwise a negative errno is returned.
2308 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2310 unsigned *vsel_mask)
2312 struct regulator_dev *rdev = regulator->rdev;
2313 const struct regulator_ops *ops = rdev->desc->ops;
2315 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2318 *vsel_reg = rdev->desc->vsel_reg;
2319 *vsel_mask = rdev->desc->vsel_mask;
2323 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2326 * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2327 * @regulator: regulator source
2328 * @selector: identify voltage to list
2330 * Converts the selector to a hardware-specific voltage selector that can be
2331 * directly written to the regulator registers. The address of the voltage
2332 * register can be determined by calling @regulator_get_hardware_vsel_register.
2334 * On error a negative errno is returned.
2336 int regulator_list_hardware_vsel(struct regulator *regulator,
2339 struct regulator_dev *rdev = regulator->rdev;
2340 const struct regulator_ops *ops = rdev->desc->ops;
2342 if (selector >= rdev->desc->n_voltages)
2344 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2349 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2352 * regulator_get_linear_step - return the voltage step size between VSEL values
2353 * @regulator: regulator source
2355 * Returns the voltage step size between VSEL values for linear
2356 * regulators, or return 0 if the regulator isn't a linear regulator.
2358 unsigned int regulator_get_linear_step(struct regulator *regulator)
2360 struct regulator_dev *rdev = regulator->rdev;
2362 return rdev->desc->uV_step;
2364 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2367 * regulator_is_supported_voltage - check if a voltage range can be supported
2369 * @regulator: Regulator to check.
2370 * @min_uV: Minimum required voltage in uV.
2371 * @max_uV: Maximum required voltage in uV.
2373 * Returns a boolean or a negative error code.
2375 int regulator_is_supported_voltage(struct regulator *regulator,
2376 int min_uV, int max_uV)
2378 struct regulator_dev *rdev = regulator->rdev;
2379 int i, voltages, ret;
2381 /* If we can't change voltage check the current voltage */
2382 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2383 ret = regulator_get_voltage(regulator);
2385 return min_uV <= ret && ret <= max_uV;
2390 /* Any voltage within constrains range is fine? */
2391 if (rdev->desc->continuous_voltage_range)
2392 return min_uV >= rdev->constraints->min_uV &&
2393 max_uV <= rdev->constraints->max_uV;
2395 ret = regulator_count_voltages(regulator);
2400 for (i = 0; i < voltages; i++) {
2401 ret = regulator_list_voltage(regulator, i);
2403 if (ret >= min_uV && ret <= max_uV)
2409 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2411 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2412 int min_uV, int max_uV,
2415 struct pre_voltage_change_data data;
2418 data.old_uV = _regulator_get_voltage(rdev);
2419 data.min_uV = min_uV;
2420 data.max_uV = max_uV;
2421 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2423 if (ret & NOTIFY_STOP_MASK)
2426 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2430 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2431 (void *)data.old_uV);
2436 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2437 int uV, unsigned selector)
2439 struct pre_voltage_change_data data;
2442 data.old_uV = _regulator_get_voltage(rdev);
2445 ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2447 if (ret & NOTIFY_STOP_MASK)
2450 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2454 _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2455 (void *)data.old_uV);
2460 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2461 int min_uV, int max_uV)
2466 unsigned int selector;
2467 int old_selector = -1;
2469 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2471 min_uV += rdev->constraints->uV_offset;
2472 max_uV += rdev->constraints->uV_offset;
2475 * If we can't obtain the old selector there is not enough
2476 * info to call set_voltage_time_sel().
2478 if (_regulator_is_enabled(rdev) &&
2479 rdev->desc->ops->set_voltage_time_sel &&
2480 rdev->desc->ops->get_voltage_sel) {
2481 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2482 if (old_selector < 0)
2483 return old_selector;
2486 if (rdev->desc->ops->set_voltage) {
2487 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2491 if (rdev->desc->ops->list_voltage)
2492 best_val = rdev->desc->ops->list_voltage(rdev,
2495 best_val = _regulator_get_voltage(rdev);
2498 } else if (rdev->desc->ops->set_voltage_sel) {
2499 if (rdev->desc->ops->map_voltage) {
2500 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2503 if (rdev->desc->ops->list_voltage ==
2504 regulator_list_voltage_linear)
2505 ret = regulator_map_voltage_linear(rdev,
2507 else if (rdev->desc->ops->list_voltage ==
2508 regulator_list_voltage_linear_range)
2509 ret = regulator_map_voltage_linear_range(rdev,
2512 ret = regulator_map_voltage_iterate(rdev,
2517 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2518 if (min_uV <= best_val && max_uV >= best_val) {
2520 if (old_selector == selector)
2523 ret = _regulator_call_set_voltage_sel(
2524 rdev, best_val, selector);
2533 /* Call set_voltage_time_sel if successfully obtained old_selector */
2534 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2535 && old_selector != selector) {
2537 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2538 old_selector, selector);
2540 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2545 /* Insert any necessary delays */
2546 if (delay >= 1000) {
2547 mdelay(delay / 1000);
2548 udelay(delay % 1000);
2554 if (ret == 0 && best_val >= 0) {
2555 unsigned long data = best_val;
2557 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2561 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2567 * regulator_set_voltage - set regulator output voltage
2568 * @regulator: regulator source
2569 * @min_uV: Minimum required voltage in uV
2570 * @max_uV: Maximum acceptable voltage in uV
2572 * Sets a voltage regulator to the desired output voltage. This can be set
2573 * during any regulator state. IOW, regulator can be disabled or enabled.
2575 * If the regulator is enabled then the voltage will change to the new value
2576 * immediately otherwise if the regulator is disabled the regulator will
2577 * output at the new voltage when enabled.
2579 * NOTE: If the regulator is shared between several devices then the lowest
2580 * request voltage that meets the system constraints will be used.
2581 * Regulator system constraints must be set for this regulator before
2582 * calling this function otherwise this call will fail.
2584 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2586 struct regulator_dev *rdev = regulator->rdev;
2588 int old_min_uV, old_max_uV;
2591 mutex_lock(&rdev->mutex);
2593 /* If we're setting the same range as last time the change
2594 * should be a noop (some cpufreq implementations use the same
2595 * voltage for multiple frequencies, for example).
2597 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2600 /* If we're trying to set a range that overlaps the current voltage,
2601 * return succesfully even though the regulator does not support
2602 * changing the voltage.
2604 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2605 current_uV = _regulator_get_voltage(rdev);
2606 if (min_uV <= current_uV && current_uV <= max_uV) {
2607 regulator->min_uV = min_uV;
2608 regulator->max_uV = max_uV;
2614 if (!rdev->desc->ops->set_voltage &&
2615 !rdev->desc->ops->set_voltage_sel) {
2620 /* constraints check */
2621 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2625 /* restore original values in case of error */
2626 old_min_uV = regulator->min_uV;
2627 old_max_uV = regulator->max_uV;
2628 regulator->min_uV = min_uV;
2629 regulator->max_uV = max_uV;
2631 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2635 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2640 mutex_unlock(&rdev->mutex);
2643 regulator->min_uV = old_min_uV;
2644 regulator->max_uV = old_max_uV;
2645 mutex_unlock(&rdev->mutex);
2648 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2651 * regulator_set_voltage_time - get raise/fall time
2652 * @regulator: regulator source
2653 * @old_uV: starting voltage in microvolts
2654 * @new_uV: target voltage in microvolts
2656 * Provided with the starting and ending voltage, this function attempts to
2657 * calculate the time in microseconds required to rise or fall to this new
2660 int regulator_set_voltage_time(struct regulator *regulator,
2661 int old_uV, int new_uV)
2663 struct regulator_dev *rdev = regulator->rdev;
2664 const struct regulator_ops *ops = rdev->desc->ops;
2670 /* Currently requires operations to do this */
2671 if (!ops->list_voltage || !ops->set_voltage_time_sel
2672 || !rdev->desc->n_voltages)
2675 for (i = 0; i < rdev->desc->n_voltages; i++) {
2676 /* We only look for exact voltage matches here */
2677 voltage = regulator_list_voltage(regulator, i);
2682 if (voltage == old_uV)
2684 if (voltage == new_uV)
2688 if (old_sel < 0 || new_sel < 0)
2691 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2693 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2696 * regulator_set_voltage_time_sel - get raise/fall time
2697 * @rdev: regulator source device
2698 * @old_selector: selector for starting voltage
2699 * @new_selector: selector for target voltage
2701 * Provided with the starting and target voltage selectors, this function
2702 * returns time in microseconds required to rise or fall to this new voltage
2704 * Drivers providing ramp_delay in regulation_constraints can use this as their
2705 * set_voltage_time_sel() operation.
2707 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2708 unsigned int old_selector,
2709 unsigned int new_selector)
2711 unsigned int ramp_delay = 0;
2712 int old_volt, new_volt;
2714 if (rdev->constraints->ramp_delay)
2715 ramp_delay = rdev->constraints->ramp_delay;
2716 else if (rdev->desc->ramp_delay)
2717 ramp_delay = rdev->desc->ramp_delay;
2719 if (ramp_delay == 0) {
2720 rdev_warn(rdev, "ramp_delay not set\n");
2725 if (!rdev->desc->ops->list_voltage)
2728 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2729 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2731 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2733 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2736 * regulator_sync_voltage - re-apply last regulator output voltage
2737 * @regulator: regulator source
2739 * Re-apply the last configured voltage. This is intended to be used
2740 * where some external control source the consumer is cooperating with
2741 * has caused the configured voltage to change.
2743 int regulator_sync_voltage(struct regulator *regulator)
2745 struct regulator_dev *rdev = regulator->rdev;
2746 int ret, min_uV, max_uV;
2748 mutex_lock(&rdev->mutex);
2750 if (!rdev->desc->ops->set_voltage &&
2751 !rdev->desc->ops->set_voltage_sel) {
2756 /* This is only going to work if we've had a voltage configured. */
2757 if (!regulator->min_uV && !regulator->max_uV) {
2762 min_uV = regulator->min_uV;
2763 max_uV = regulator->max_uV;
2765 /* This should be a paranoia check... */
2766 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2770 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2774 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2777 mutex_unlock(&rdev->mutex);
2780 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2782 static int _regulator_get_voltage(struct regulator_dev *rdev)
2786 if (rdev->desc->ops->get_voltage_sel) {
2787 sel = rdev->desc->ops->get_voltage_sel(rdev);
2790 ret = rdev->desc->ops->list_voltage(rdev, sel);
2791 } else if (rdev->desc->ops->get_voltage) {
2792 ret = rdev->desc->ops->get_voltage(rdev);
2793 } else if (rdev->desc->ops->list_voltage) {
2794 ret = rdev->desc->ops->list_voltage(rdev, 0);
2795 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2796 ret = rdev->desc->fixed_uV;
2797 } else if (rdev->supply) {
2798 ret = regulator_get_voltage(rdev->supply);
2805 return ret - rdev->constraints->uV_offset;
2809 * regulator_get_voltage - get regulator output voltage
2810 * @regulator: regulator source
2812 * This returns the current regulator voltage in uV.
2814 * NOTE: If the regulator is disabled it will return the voltage value. This
2815 * function should not be used to determine regulator state.
2817 int regulator_get_voltage(struct regulator *regulator)
2821 mutex_lock(®ulator->rdev->mutex);
2823 ret = _regulator_get_voltage(regulator->rdev);
2825 mutex_unlock(®ulator->rdev->mutex);
2829 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2832 * regulator_set_current_limit - set regulator output current limit
2833 * @regulator: regulator source
2834 * @min_uA: Minimum supported current in uA
2835 * @max_uA: Maximum supported current in uA
2837 * Sets current sink to the desired output current. This can be set during
2838 * any regulator state. IOW, regulator can be disabled or enabled.
2840 * If the regulator is enabled then the current will change to the new value
2841 * immediately otherwise if the regulator is disabled the regulator will
2842 * output at the new current when enabled.
2844 * NOTE: Regulator system constraints must be set for this regulator before
2845 * calling this function otherwise this call will fail.
2847 int regulator_set_current_limit(struct regulator *regulator,
2848 int min_uA, int max_uA)
2850 struct regulator_dev *rdev = regulator->rdev;
2853 mutex_lock(&rdev->mutex);
2856 if (!rdev->desc->ops->set_current_limit) {
2861 /* constraints check */
2862 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2866 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2868 mutex_unlock(&rdev->mutex);
2871 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2873 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2877 mutex_lock(&rdev->mutex);
2880 if (!rdev->desc->ops->get_current_limit) {
2885 ret = rdev->desc->ops->get_current_limit(rdev);
2887 mutex_unlock(&rdev->mutex);
2892 * regulator_get_current_limit - get regulator output current
2893 * @regulator: regulator source
2895 * This returns the current supplied by the specified current sink in uA.
2897 * NOTE: If the regulator is disabled it will return the current value. This
2898 * function should not be used to determine regulator state.
2900 int regulator_get_current_limit(struct regulator *regulator)
2902 return _regulator_get_current_limit(regulator->rdev);
2904 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2907 * regulator_set_mode - set regulator operating mode
2908 * @regulator: regulator source
2909 * @mode: operating mode - one of the REGULATOR_MODE constants
2911 * Set regulator operating mode to increase regulator efficiency or improve
2912 * regulation performance.
2914 * NOTE: Regulator system constraints must be set for this regulator before
2915 * calling this function otherwise this call will fail.
2917 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2919 struct regulator_dev *rdev = regulator->rdev;
2921 int regulator_curr_mode;
2923 mutex_lock(&rdev->mutex);
2926 if (!rdev->desc->ops->set_mode) {
2931 /* return if the same mode is requested */
2932 if (rdev->desc->ops->get_mode) {
2933 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2934 if (regulator_curr_mode == mode) {
2940 /* constraints check */
2941 ret = regulator_mode_constrain(rdev, &mode);
2945 ret = rdev->desc->ops->set_mode(rdev, mode);
2947 mutex_unlock(&rdev->mutex);
2950 EXPORT_SYMBOL_GPL(regulator_set_mode);
2952 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2956 mutex_lock(&rdev->mutex);
2959 if (!rdev->desc->ops->get_mode) {
2964 ret = rdev->desc->ops->get_mode(rdev);
2966 mutex_unlock(&rdev->mutex);
2971 * regulator_get_mode - get regulator operating mode
2972 * @regulator: regulator source
2974 * Get the current regulator operating mode.
2976 unsigned int regulator_get_mode(struct regulator *regulator)
2978 return _regulator_get_mode(regulator->rdev);
2980 EXPORT_SYMBOL_GPL(regulator_get_mode);
2983 * regulator_set_optimum_mode - set regulator optimum operating mode
2984 * @regulator: regulator source
2985 * @uA_load: load current
2987 * Notifies the regulator core of a new device load. This is then used by
2988 * DRMS (if enabled by constraints) to set the most efficient regulator
2989 * operating mode for the new regulator loading.
2991 * Consumer devices notify their supply regulator of the maximum power
2992 * they will require (can be taken from device datasheet in the power
2993 * consumption tables) when they change operational status and hence power
2994 * state. Examples of operational state changes that can affect power
2995 * consumption are :-
2997 * o Device is opened / closed.
2998 * o Device I/O is about to begin or has just finished.
2999 * o Device is idling in between work.
3001 * This information is also exported via sysfs to userspace.
3003 * DRMS will sum the total requested load on the regulator and change
3004 * to the most efficient operating mode if platform constraints allow.
3006 * Returns the new regulator mode or error.
3008 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
3010 struct regulator_dev *rdev = regulator->rdev;
3011 struct regulator *consumer;
3012 int ret, output_uV, input_uV = 0, total_uA_load = 0;
3016 input_uV = regulator_get_voltage(rdev->supply);
3018 mutex_lock(&rdev->mutex);
3021 * first check to see if we can set modes at all, otherwise just
3022 * tell the consumer everything is OK.
3024 regulator->uA_load = uA_load;
3025 ret = regulator_check_drms(rdev);
3031 if (!rdev->desc->ops->get_optimum_mode)
3035 * we can actually do this so any errors are indicators of
3036 * potential real failure.
3040 if (!rdev->desc->ops->set_mode)
3043 /* get output voltage */
3044 output_uV = _regulator_get_voltage(rdev);
3045 if (output_uV <= 0) {
3046 rdev_err(rdev, "invalid output voltage found\n");
3050 /* No supply? Use constraint voltage */
3052 input_uV = rdev->constraints->input_uV;
3053 if (input_uV <= 0) {
3054 rdev_err(rdev, "invalid input voltage found\n");
3058 /* calc total requested load for this regulator */
3059 list_for_each_entry(consumer, &rdev->consumer_list, list)
3060 total_uA_load += consumer->uA_load;
3062 mode = rdev->desc->ops->get_optimum_mode(rdev,
3063 input_uV, output_uV,
3065 ret = regulator_mode_constrain(rdev, &mode);
3067 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
3068 total_uA_load, input_uV, output_uV);
3072 ret = rdev->desc->ops->set_mode(rdev, mode);
3074 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
3079 mutex_unlock(&rdev->mutex);
3082 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
3085 * regulator_allow_bypass - allow the regulator to go into bypass mode
3087 * @regulator: Regulator to configure
3088 * @enable: enable or disable bypass mode
3090 * Allow the regulator to go into bypass mode if all other consumers
3091 * for the regulator also enable bypass mode and the machine
3092 * constraints allow this. Bypass mode means that the regulator is
3093 * simply passing the input directly to the output with no regulation.
3095 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3097 struct regulator_dev *rdev = regulator->rdev;
3100 if (!rdev->desc->ops->set_bypass)
3103 if (rdev->constraints &&
3104 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3107 mutex_lock(&rdev->mutex);
3109 if (enable && !regulator->bypass) {
3110 rdev->bypass_count++;
3112 if (rdev->bypass_count == rdev->open_count) {
3113 ret = rdev->desc->ops->set_bypass(rdev, enable);
3115 rdev->bypass_count--;
3118 } else if (!enable && regulator->bypass) {
3119 rdev->bypass_count--;
3121 if (rdev->bypass_count != rdev->open_count) {
3122 ret = rdev->desc->ops->set_bypass(rdev, enable);
3124 rdev->bypass_count++;
3129 regulator->bypass = enable;
3131 mutex_unlock(&rdev->mutex);
3135 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3138 * regulator_register_notifier - register regulator event notifier
3139 * @regulator: regulator source
3140 * @nb: notifier block
3142 * Register notifier block to receive regulator events.
3144 int regulator_register_notifier(struct regulator *regulator,
3145 struct notifier_block *nb)
3147 return blocking_notifier_chain_register(®ulator->rdev->notifier,
3150 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3153 * regulator_unregister_notifier - unregister regulator event notifier
3154 * @regulator: regulator source
3155 * @nb: notifier block
3157 * Unregister regulator event notifier block.
3159 int regulator_unregister_notifier(struct regulator *regulator,
3160 struct notifier_block *nb)
3162 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
3165 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3167 /* notify regulator consumers and downstream regulator consumers.
3168 * Note mutex must be held by caller.
3170 static int _notifier_call_chain(struct regulator_dev *rdev,
3171 unsigned long event, void *data)
3173 /* call rdev chain first */
3174 return blocking_notifier_call_chain(&rdev->notifier, event, data);
3178 * regulator_bulk_get - get multiple regulator consumers
3180 * @dev: Device to supply
3181 * @num_consumers: Number of consumers to register
3182 * @consumers: Configuration of consumers; clients are stored here.
3184 * @return 0 on success, an errno on failure.
3186 * This helper function allows drivers to get several regulator
3187 * consumers in one operation. If any of the regulators cannot be
3188 * acquired then any regulators that were allocated will be freed
3189 * before returning to the caller.
3191 int regulator_bulk_get(struct device *dev, int num_consumers,
3192 struct regulator_bulk_data *consumers)
3197 for (i = 0; i < num_consumers; i++)
3198 consumers[i].consumer = NULL;
3200 for (i = 0; i < num_consumers; i++) {
3201 consumers[i].consumer = regulator_get(dev,
3202 consumers[i].supply);
3203 if (IS_ERR(consumers[i].consumer)) {
3204 ret = PTR_ERR(consumers[i].consumer);
3205 dev_err(dev, "Failed to get supply '%s': %d\n",
3206 consumers[i].supply, ret);
3207 consumers[i].consumer = NULL;
3216 regulator_put(consumers[i].consumer);
3220 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3222 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3224 struct regulator_bulk_data *bulk = data;
3226 bulk->ret = regulator_enable(bulk->consumer);
3230 * regulator_bulk_enable - enable multiple regulator consumers
3232 * @num_consumers: Number of consumers
3233 * @consumers: Consumer data; clients are stored here.
3234 * @return 0 on success, an errno on failure
3236 * This convenience API allows consumers to enable multiple regulator
3237 * clients in a single API call. If any consumers cannot be enabled
3238 * then any others that were enabled will be disabled again prior to
3241 int regulator_bulk_enable(int num_consumers,
3242 struct regulator_bulk_data *consumers)
3244 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3248 for (i = 0; i < num_consumers; i++) {
3249 if (consumers[i].consumer->always_on)
3250 consumers[i].ret = 0;
3252 async_schedule_domain(regulator_bulk_enable_async,
3253 &consumers[i], &async_domain);
3256 async_synchronize_full_domain(&async_domain);
3258 /* If any consumer failed we need to unwind any that succeeded */
3259 for (i = 0; i < num_consumers; i++) {
3260 if (consumers[i].ret != 0) {
3261 ret = consumers[i].ret;
3269 for (i = 0; i < num_consumers; i++) {
3270 if (consumers[i].ret < 0)
3271 pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3274 regulator_disable(consumers[i].consumer);
3279 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3282 * regulator_bulk_disable - disable multiple regulator consumers
3284 * @num_consumers: Number of consumers
3285 * @consumers: Consumer data; clients are stored here.
3286 * @return 0 on success, an errno on failure
3288 * This convenience API allows consumers to disable multiple regulator
3289 * clients in a single API call. If any consumers cannot be disabled
3290 * then any others that were disabled will be enabled again prior to
3293 int regulator_bulk_disable(int num_consumers,
3294 struct regulator_bulk_data *consumers)
3299 for (i = num_consumers - 1; i >= 0; --i) {
3300 ret = regulator_disable(consumers[i].consumer);
3308 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3309 for (++i; i < num_consumers; ++i) {
3310 r = regulator_enable(consumers[i].consumer);
3312 pr_err("Failed to reename %s: %d\n",
3313 consumers[i].supply, r);
3318 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3321 * regulator_bulk_force_disable - force disable multiple regulator consumers
3323 * @num_consumers: Number of consumers
3324 * @consumers: Consumer data; clients are stored here.
3325 * @return 0 on success, an errno on failure
3327 * This convenience API allows consumers to forcibly disable multiple regulator
3328 * clients in a single API call.
3329 * NOTE: This should be used for situations when device damage will
3330 * likely occur if the regulators are not disabled (e.g. over temp).
3331 * Although regulator_force_disable function call for some consumers can
3332 * return error numbers, the function is called for all consumers.
3334 int regulator_bulk_force_disable(int num_consumers,
3335 struct regulator_bulk_data *consumers)
3340 for (i = 0; i < num_consumers; i++)
3342 regulator_force_disable(consumers[i].consumer);
3344 for (i = 0; i < num_consumers; i++) {
3345 if (consumers[i].ret != 0) {
3346 ret = consumers[i].ret;
3355 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3358 * regulator_bulk_free - free multiple regulator consumers
3360 * @num_consumers: Number of consumers
3361 * @consumers: Consumer data; clients are stored here.
3363 * This convenience API allows consumers to free multiple regulator
3364 * clients in a single API call.
3366 void regulator_bulk_free(int num_consumers,
3367 struct regulator_bulk_data *consumers)
3371 for (i = 0; i < num_consumers; i++) {
3372 regulator_put(consumers[i].consumer);
3373 consumers[i].consumer = NULL;
3376 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3379 * regulator_notifier_call_chain - call regulator event notifier
3380 * @rdev: regulator source
3381 * @event: notifier block
3382 * @data: callback-specific data.
3384 * Called by regulator drivers to notify clients a regulator event has
3385 * occurred. We also notify regulator clients downstream.
3386 * Note lock must be held by caller.
3388 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3389 unsigned long event, void *data)
3391 _notifier_call_chain(rdev, event, data);
3395 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3398 * regulator_mode_to_status - convert a regulator mode into a status
3400 * @mode: Mode to convert
3402 * Convert a regulator mode into a status.
3404 int regulator_mode_to_status(unsigned int mode)
3407 case REGULATOR_MODE_FAST:
3408 return REGULATOR_STATUS_FAST;
3409 case REGULATOR_MODE_NORMAL:
3410 return REGULATOR_STATUS_NORMAL;
3411 case REGULATOR_MODE_IDLE:
3412 return REGULATOR_STATUS_IDLE;
3413 case REGULATOR_MODE_STANDBY:
3414 return REGULATOR_STATUS_STANDBY;
3416 return REGULATOR_STATUS_UNDEFINED;
3419 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3422 * To avoid cluttering sysfs (and memory) with useless state, only
3423 * create attributes that can be meaningfully displayed.
3425 static int add_regulator_attributes(struct regulator_dev *rdev)
3427 struct device *dev = &rdev->dev;
3428 const struct regulator_ops *ops = rdev->desc->ops;
3431 /* some attributes need specific methods to be displayed */
3432 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3433 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3434 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3435 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3436 status = device_create_file(dev, &dev_attr_microvolts);
3440 if (ops->get_current_limit) {
3441 status = device_create_file(dev, &dev_attr_microamps);
3445 if (ops->get_mode) {
3446 status = device_create_file(dev, &dev_attr_opmode);
3450 if (rdev->ena_pin || ops->is_enabled) {
3451 status = device_create_file(dev, &dev_attr_state);
3455 if (ops->get_status) {
3456 status = device_create_file(dev, &dev_attr_status);
3460 if (ops->get_bypass) {
3461 status = device_create_file(dev, &dev_attr_bypass);
3466 /* some attributes are type-specific */
3467 if (rdev->desc->type == REGULATOR_CURRENT) {
3468 status = device_create_file(dev, &dev_attr_requested_microamps);
3473 /* all the other attributes exist to support constraints;
3474 * don't show them if there are no constraints, or if the
3475 * relevant supporting methods are missing.
3477 if (!rdev->constraints)
3480 /* constraints need specific supporting methods */
3481 if (ops->set_voltage || ops->set_voltage_sel) {
3482 status = device_create_file(dev, &dev_attr_min_microvolts);
3485 status = device_create_file(dev, &dev_attr_max_microvolts);
3489 if (ops->set_current_limit) {
3490 status = device_create_file(dev, &dev_attr_min_microamps);
3493 status = device_create_file(dev, &dev_attr_max_microamps);
3498 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3501 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3504 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3508 if (ops->set_suspend_voltage) {
3509 status = device_create_file(dev,
3510 &dev_attr_suspend_standby_microvolts);
3513 status = device_create_file(dev,
3514 &dev_attr_suspend_mem_microvolts);
3517 status = device_create_file(dev,
3518 &dev_attr_suspend_disk_microvolts);
3523 if (ops->set_suspend_mode) {
3524 status = device_create_file(dev,
3525 &dev_attr_suspend_standby_mode);
3528 status = device_create_file(dev,
3529 &dev_attr_suspend_mem_mode);
3532 status = device_create_file(dev,
3533 &dev_attr_suspend_disk_mode);
3541 static void rdev_init_debugfs(struct regulator_dev *rdev)
3543 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3544 if (!rdev->debugfs) {
3545 rdev_warn(rdev, "Failed to create debugfs directory\n");
3549 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3551 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3553 debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3554 &rdev->bypass_count);
3558 * regulator_register - register regulator
3559 * @regulator_desc: regulator to register
3560 * @config: runtime configuration for regulator
3562 * Called by regulator drivers to register a regulator.
3563 * Returns a valid pointer to struct regulator_dev on success
3564 * or an ERR_PTR() on error.
3566 struct regulator_dev *
3567 regulator_register(const struct regulator_desc *regulator_desc,
3568 const struct regulator_config *config)
3570 const struct regulation_constraints *constraints = NULL;
3571 const struct regulator_init_data *init_data;
3572 static atomic_t regulator_no = ATOMIC_INIT(0);
3573 struct regulator_dev *rdev;
3576 const char *supply = NULL;
3578 if (regulator_desc == NULL || config == NULL)
3579 return ERR_PTR(-EINVAL);
3584 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3585 return ERR_PTR(-EINVAL);
3587 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3588 regulator_desc->type != REGULATOR_CURRENT)
3589 return ERR_PTR(-EINVAL);
3591 /* Only one of each should be implemented */
3592 WARN_ON(regulator_desc->ops->get_voltage &&
3593 regulator_desc->ops->get_voltage_sel);
3594 WARN_ON(regulator_desc->ops->set_voltage &&
3595 regulator_desc->ops->set_voltage_sel);
3597 /* If we're using selectors we must implement list_voltage. */
3598 if (regulator_desc->ops->get_voltage_sel &&
3599 !regulator_desc->ops->list_voltage) {
3600 return ERR_PTR(-EINVAL);
3602 if (regulator_desc->ops->set_voltage_sel &&
3603 !regulator_desc->ops->list_voltage) {
3604 return ERR_PTR(-EINVAL);
3607 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3609 return ERR_PTR(-ENOMEM);
3611 init_data = regulator_of_get_init_data(dev, regulator_desc,
3612 &rdev->dev.of_node);
3614 init_data = config->init_data;
3615 rdev->dev.of_node = of_node_get(config->of_node);
3618 mutex_lock(®ulator_list_mutex);
3620 mutex_init(&rdev->mutex);
3621 rdev->reg_data = config->driver_data;
3622 rdev->owner = regulator_desc->owner;
3623 rdev->desc = regulator_desc;
3625 rdev->regmap = config->regmap;
3626 else if (dev_get_regmap(dev, NULL))
3627 rdev->regmap = dev_get_regmap(dev, NULL);
3628 else if (dev->parent)
3629 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3630 INIT_LIST_HEAD(&rdev->consumer_list);
3631 INIT_LIST_HEAD(&rdev->list);
3632 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3633 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3635 /* preform any regulator specific init */
3636 if (init_data && init_data->regulator_init) {
3637 ret = init_data->regulator_init(rdev->reg_data);
3642 /* register with sysfs */
3643 rdev->dev.class = ®ulator_class;
3644 rdev->dev.parent = dev;
3645 dev_set_name(&rdev->dev, "regulator.%d",
3646 atomic_inc_return(®ulator_no) - 1);
3647 ret = device_register(&rdev->dev);
3649 put_device(&rdev->dev);
3653 dev_set_drvdata(&rdev->dev, rdev);
3655 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3656 ret = regulator_ena_gpio_request(rdev, config);
3658 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3659 config->ena_gpio, ret);
3663 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3664 rdev->ena_gpio_state = 1;
3666 if (config->ena_gpio_invert)
3667 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3670 /* set regulator constraints */
3672 constraints = &init_data->constraints;
3674 ret = set_machine_constraints(rdev, constraints);
3678 /* add attributes supported by this regulator */
3679 ret = add_regulator_attributes(rdev);
3683 if (init_data && init_data->supply_regulator)
3684 supply = init_data->supply_regulator;
3685 else if (regulator_desc->supply_name)
3686 supply = regulator_desc->supply_name;
3689 struct regulator_dev *r;
3691 r = regulator_dev_lookup(dev, supply, &ret);
3693 if (ret == -ENODEV) {
3695 * No supply was specified for this regulator and
3696 * there will never be one.
3701 dev_err(dev, "Failed to find supply %s\n", supply);
3702 ret = -EPROBE_DEFER;
3706 ret = set_supply(rdev, r);
3710 /* Enable supply if rail is enabled */
3711 if (_regulator_is_enabled(rdev)) {
3712 ret = regulator_enable(rdev->supply);
3719 /* add consumers devices */
3721 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3722 ret = set_consumer_device_supply(rdev,
3723 init_data->consumer_supplies[i].dev_name,
3724 init_data->consumer_supplies[i].supply);
3726 dev_err(dev, "Failed to set supply %s\n",
3727 init_data->consumer_supplies[i].supply);
3728 goto unset_supplies;
3733 list_add(&rdev->list, ®ulator_list);
3735 rdev_init_debugfs(rdev);
3737 mutex_unlock(®ulator_list_mutex);
3741 unset_regulator_supplies(rdev);
3745 _regulator_put(rdev->supply);
3746 regulator_ena_gpio_free(rdev);
3747 kfree(rdev->constraints);
3749 device_unregister(&rdev->dev);
3750 /* device core frees rdev */
3751 rdev = ERR_PTR(ret);
3756 rdev = ERR_PTR(ret);
3759 EXPORT_SYMBOL_GPL(regulator_register);
3762 * regulator_unregister - unregister regulator
3763 * @rdev: regulator to unregister
3765 * Called by regulator drivers to unregister a regulator.
3767 void regulator_unregister(struct regulator_dev *rdev)
3773 while (rdev->use_count--)
3774 regulator_disable(rdev->supply);
3775 regulator_put(rdev->supply);
3777 mutex_lock(®ulator_list_mutex);
3778 debugfs_remove_recursive(rdev->debugfs);
3779 flush_work(&rdev->disable_work.work);
3780 WARN_ON(rdev->open_count);
3781 unset_regulator_supplies(rdev);
3782 list_del(&rdev->list);
3783 kfree(rdev->constraints);
3784 regulator_ena_gpio_free(rdev);
3785 of_node_put(rdev->dev.of_node);
3786 device_unregister(&rdev->dev);
3787 mutex_unlock(®ulator_list_mutex);
3789 EXPORT_SYMBOL_GPL(regulator_unregister);
3792 * regulator_suspend_prepare - prepare regulators for system wide suspend
3793 * @state: system suspend state
3795 * Configure each regulator with it's suspend operating parameters for state.
3796 * This will usually be called by machine suspend code prior to supending.
3798 int regulator_suspend_prepare(suspend_state_t state)
3800 struct regulator_dev *rdev;
3803 /* ON is handled by regulator active state */
3804 if (state == PM_SUSPEND_ON)
3807 mutex_lock(®ulator_list_mutex);
3808 list_for_each_entry(rdev, ®ulator_list, list) {
3810 mutex_lock(&rdev->mutex);
3811 ret = suspend_prepare(rdev, state);
3812 mutex_unlock(&rdev->mutex);
3815 rdev_err(rdev, "failed to prepare\n");
3820 mutex_unlock(®ulator_list_mutex);
3823 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3826 * regulator_suspend_finish - resume regulators from system wide suspend
3828 * Turn on regulators that might be turned off by regulator_suspend_prepare
3829 * and that should be turned on according to the regulators properties.
3831 int regulator_suspend_finish(void)
3833 struct regulator_dev *rdev;
3836 mutex_lock(®ulator_list_mutex);
3837 list_for_each_entry(rdev, ®ulator_list, list) {
3838 mutex_lock(&rdev->mutex);
3839 if (rdev->use_count > 0 || rdev->constraints->always_on) {
3840 error = _regulator_do_enable(rdev);
3844 if (!have_full_constraints())
3846 if (!_regulator_is_enabled(rdev))
3849 error = _regulator_do_disable(rdev);
3854 mutex_unlock(&rdev->mutex);
3856 mutex_unlock(®ulator_list_mutex);
3859 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3862 * regulator_has_full_constraints - the system has fully specified constraints
3864 * Calling this function will cause the regulator API to disable all
3865 * regulators which have a zero use count and don't have an always_on
3866 * constraint in a late_initcall.
3868 * The intention is that this will become the default behaviour in a
3869 * future kernel release so users are encouraged to use this facility
3872 void regulator_has_full_constraints(void)
3874 has_full_constraints = 1;
3876 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3879 * rdev_get_drvdata - get rdev regulator driver data
3882 * Get rdev regulator driver private data. This call can be used in the
3883 * regulator driver context.
3885 void *rdev_get_drvdata(struct regulator_dev *rdev)
3887 return rdev->reg_data;
3889 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3892 * regulator_get_drvdata - get regulator driver data
3893 * @regulator: regulator
3895 * Get regulator driver private data. This call can be used in the consumer
3896 * driver context when non API regulator specific functions need to be called.
3898 void *regulator_get_drvdata(struct regulator *regulator)
3900 return regulator->rdev->reg_data;
3902 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3905 * regulator_set_drvdata - set regulator driver data
3906 * @regulator: regulator
3909 void regulator_set_drvdata(struct regulator *regulator, void *data)
3911 regulator->rdev->reg_data = data;
3913 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3916 * regulator_get_id - get regulator ID
3919 int rdev_get_id(struct regulator_dev *rdev)
3921 return rdev->desc->id;
3923 EXPORT_SYMBOL_GPL(rdev_get_id);
3925 struct device *rdev_get_dev(struct regulator_dev *rdev)
3929 EXPORT_SYMBOL_GPL(rdev_get_dev);
3931 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3933 return reg_init_data->driver_data;
3935 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3937 #ifdef CONFIG_DEBUG_FS
3938 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3939 size_t count, loff_t *ppos)
3941 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3942 ssize_t len, ret = 0;
3943 struct regulator_map *map;
3948 list_for_each_entry(map, ®ulator_map_list, list) {
3949 len = snprintf(buf + ret, PAGE_SIZE - ret,
3951 rdev_get_name(map->regulator), map->dev_name,
3955 if (ret > PAGE_SIZE) {
3961 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3969 static const struct file_operations supply_map_fops = {
3970 #ifdef CONFIG_DEBUG_FS
3971 .read = supply_map_read_file,
3972 .llseek = default_llseek,
3976 static int __init regulator_init(void)
3980 ret = class_register(®ulator_class);
3982 debugfs_root = debugfs_create_dir("regulator", NULL);
3984 pr_warn("regulator: Failed to create debugfs directory\n");
3986 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3989 regulator_dummy_init();
3994 /* init early to allow our consumers to complete system booting */
3995 core_initcall(regulator_init);
3997 static int __init regulator_init_complete(void)
3999 struct regulator_dev *rdev;
4000 const struct regulator_ops *ops;
4001 struct regulation_constraints *c;
4005 * Since DT doesn't provide an idiomatic mechanism for
4006 * enabling full constraints and since it's much more natural
4007 * with DT to provide them just assume that a DT enabled
4008 * system has full constraints.
4010 if (of_have_populated_dt())
4011 has_full_constraints = true;
4013 mutex_lock(®ulator_list_mutex);
4015 /* If we have a full configuration then disable any regulators
4016 * we have permission to change the status for and which are
4017 * not in use or always_on. This is effectively the default
4018 * for DT and ACPI as they have full constraints.
4020 list_for_each_entry(rdev, ®ulator_list, list) {
4021 ops = rdev->desc->ops;
4022 c = rdev->constraints;
4024 if (c && c->always_on)
4027 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4030 mutex_lock(&rdev->mutex);
4032 if (rdev->use_count)
4035 /* If we can't read the status assume it's on. */
4036 if (ops->is_enabled)
4037 enabled = ops->is_enabled(rdev);
4044 if (have_full_constraints()) {
4045 /* We log since this may kill the system if it
4047 rdev_info(rdev, "disabling\n");
4048 ret = _regulator_do_disable(rdev);
4050 rdev_err(rdev, "couldn't disable: %d\n", ret);
4052 /* The intention is that in future we will
4053 * assume that full constraints are provided
4054 * so warn even if we aren't going to do
4057 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4061 mutex_unlock(&rdev->mutex);
4064 mutex_unlock(®ulator_list_mutex);
4068 late_initcall_sync(regulator_init_complete);