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>
27 #include <linux/regulator/of_regulator.h>
28 #include <linux/regulator/consumer.h>
29 #include <linux/regulator/driver.h>
30 #include <linux/regulator/machine.h>
31 #include <linux/module.h>
33 #define CREATE_TRACE_POINTS
34 #include <trace/events/regulator.h>
38 #define rdev_crit(rdev, fmt, ...) \
39 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
40 #define rdev_err(rdev, fmt, ...) \
41 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
42 #define rdev_warn(rdev, fmt, ...) \
43 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44 #define rdev_info(rdev, fmt, ...) \
45 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46 #define rdev_dbg(rdev, fmt, ...) \
47 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
49 static DEFINE_MUTEX(regulator_list_mutex);
50 static LIST_HEAD(regulator_list);
51 static LIST_HEAD(regulator_map_list);
52 static bool has_full_constraints;
53 static bool board_wants_dummy_regulator;
55 static struct dentry *debugfs_root;
58 * struct regulator_map
60 * Used to provide symbolic supply names to devices.
62 struct regulator_map {
63 struct list_head list;
64 const char *dev_name; /* The dev_name() for the consumer */
66 struct regulator_dev *regulator;
72 * One for each consumer device.
76 struct list_head list;
81 struct device_attribute dev_attr;
82 struct regulator_dev *rdev;
83 struct dentry *debugfs;
86 static int _regulator_is_enabled(struct regulator_dev *rdev);
87 static int _regulator_disable(struct regulator_dev *rdev);
88 static int _regulator_get_voltage(struct regulator_dev *rdev);
89 static int _regulator_get_current_limit(struct regulator_dev *rdev);
90 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
91 static void _notifier_call_chain(struct regulator_dev *rdev,
92 unsigned long event, void *data);
93 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
94 int min_uV, int max_uV);
95 static struct regulator *create_regulator(struct regulator_dev *rdev,
97 const char *supply_name);
99 static const char *rdev_get_name(struct regulator_dev *rdev)
101 if (rdev->constraints && rdev->constraints->name)
102 return rdev->constraints->name;
103 else if (rdev->desc->name)
104 return rdev->desc->name;
109 /* gets the regulator for a given consumer device */
110 static struct regulator *get_device_regulator(struct device *dev)
112 struct regulator *regulator = NULL;
113 struct regulator_dev *rdev;
115 mutex_lock(®ulator_list_mutex);
116 list_for_each_entry(rdev, ®ulator_list, list) {
117 mutex_lock(&rdev->mutex);
118 list_for_each_entry(regulator, &rdev->consumer_list, list) {
119 if (regulator->dev == dev) {
120 mutex_unlock(&rdev->mutex);
121 mutex_unlock(®ulator_list_mutex);
125 mutex_unlock(&rdev->mutex);
127 mutex_unlock(®ulator_list_mutex);
132 * of_get_regulator - get a regulator device node based on supply name
133 * @dev: Device pointer for the consumer (of regulator) device
134 * @supply: regulator supply name
136 * Extract the regulator device node corresponding to the supply name.
137 * retruns the device node corresponding to the regulator if found, else
140 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
142 struct device_node *regnode = NULL;
143 char prop_name[32]; /* 32 is max size of property name */
145 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
147 snprintf(prop_name, 32, "%s-supply", supply);
148 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
151 dev_dbg(dev, "Looking up %s property in node %s failed",
152 prop_name, dev->of_node->full_name);
158 /* Platform voltage constraint check */
159 static int regulator_check_voltage(struct regulator_dev *rdev,
160 int *min_uV, int *max_uV)
162 BUG_ON(*min_uV > *max_uV);
164 if (!rdev->constraints) {
165 rdev_err(rdev, "no constraints\n");
168 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
169 rdev_err(rdev, "operation not allowed\n");
173 if (*max_uV > rdev->constraints->max_uV)
174 *max_uV = rdev->constraints->max_uV;
175 if (*min_uV < rdev->constraints->min_uV)
176 *min_uV = rdev->constraints->min_uV;
178 if (*min_uV > *max_uV) {
179 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
187 /* Make sure we select a voltage that suits the needs of all
188 * regulator consumers
190 static int regulator_check_consumers(struct regulator_dev *rdev,
191 int *min_uV, int *max_uV)
193 struct regulator *regulator;
195 list_for_each_entry(regulator, &rdev->consumer_list, list) {
197 * Assume consumers that didn't say anything are OK
198 * with anything in the constraint range.
200 if (!regulator->min_uV && !regulator->max_uV)
203 if (*max_uV > regulator->max_uV)
204 *max_uV = regulator->max_uV;
205 if (*min_uV < regulator->min_uV)
206 *min_uV = regulator->min_uV;
209 if (*min_uV > *max_uV)
215 /* current constraint check */
216 static int regulator_check_current_limit(struct regulator_dev *rdev,
217 int *min_uA, int *max_uA)
219 BUG_ON(*min_uA > *max_uA);
221 if (!rdev->constraints) {
222 rdev_err(rdev, "no constraints\n");
225 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
226 rdev_err(rdev, "operation not allowed\n");
230 if (*max_uA > rdev->constraints->max_uA)
231 *max_uA = rdev->constraints->max_uA;
232 if (*min_uA < rdev->constraints->min_uA)
233 *min_uA = rdev->constraints->min_uA;
235 if (*min_uA > *max_uA) {
236 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
244 /* operating mode constraint check */
245 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
248 case REGULATOR_MODE_FAST:
249 case REGULATOR_MODE_NORMAL:
250 case REGULATOR_MODE_IDLE:
251 case REGULATOR_MODE_STANDBY:
254 rdev_err(rdev, "invalid mode %x specified\n", *mode);
258 if (!rdev->constraints) {
259 rdev_err(rdev, "no constraints\n");
262 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
263 rdev_err(rdev, "operation not allowed\n");
267 /* The modes are bitmasks, the most power hungry modes having
268 * the lowest values. If the requested mode isn't supported
269 * try higher modes. */
271 if (rdev->constraints->valid_modes_mask & *mode)
279 /* dynamic regulator mode switching constraint check */
280 static int regulator_check_drms(struct regulator_dev *rdev)
282 if (!rdev->constraints) {
283 rdev_err(rdev, "no constraints\n");
286 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
287 rdev_err(rdev, "operation not allowed\n");
293 static ssize_t device_requested_uA_show(struct device *dev,
294 struct device_attribute *attr, char *buf)
296 struct regulator *regulator;
298 regulator = get_device_regulator(dev);
299 if (regulator == NULL)
302 return sprintf(buf, "%d\n", regulator->uA_load);
305 static ssize_t regulator_uV_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
308 struct regulator_dev *rdev = dev_get_drvdata(dev);
311 mutex_lock(&rdev->mutex);
312 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
313 mutex_unlock(&rdev->mutex);
317 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
319 static ssize_t regulator_uA_show(struct device *dev,
320 struct device_attribute *attr, char *buf)
322 struct regulator_dev *rdev = dev_get_drvdata(dev);
324 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
326 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
328 static ssize_t regulator_name_show(struct device *dev,
329 struct device_attribute *attr, char *buf)
331 struct regulator_dev *rdev = dev_get_drvdata(dev);
333 return sprintf(buf, "%s\n", rdev_get_name(rdev));
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:
421 return sprintf(buf, "%s\n", label);
423 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
425 static ssize_t regulator_min_uA_show(struct device *dev,
426 struct device_attribute *attr, char *buf)
428 struct regulator_dev *rdev = dev_get_drvdata(dev);
430 if (!rdev->constraints)
431 return sprintf(buf, "constraint not defined\n");
433 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
435 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
437 static ssize_t regulator_max_uA_show(struct device *dev,
438 struct device_attribute *attr, char *buf)
440 struct regulator_dev *rdev = dev_get_drvdata(dev);
442 if (!rdev->constraints)
443 return sprintf(buf, "constraint not defined\n");
445 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
447 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
449 static ssize_t regulator_min_uV_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
452 struct regulator_dev *rdev = dev_get_drvdata(dev);
454 if (!rdev->constraints)
455 return sprintf(buf, "constraint not defined\n");
457 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
459 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
461 static ssize_t regulator_max_uV_show(struct device *dev,
462 struct device_attribute *attr, char *buf)
464 struct regulator_dev *rdev = dev_get_drvdata(dev);
466 if (!rdev->constraints)
467 return sprintf(buf, "constraint not defined\n");
469 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
471 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
473 static ssize_t regulator_total_uA_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
476 struct regulator_dev *rdev = dev_get_drvdata(dev);
477 struct regulator *regulator;
480 mutex_lock(&rdev->mutex);
481 list_for_each_entry(regulator, &rdev->consumer_list, list)
482 uA += regulator->uA_load;
483 mutex_unlock(&rdev->mutex);
484 return sprintf(buf, "%d\n", uA);
486 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
488 static ssize_t regulator_num_users_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
491 struct regulator_dev *rdev = dev_get_drvdata(dev);
492 return sprintf(buf, "%d\n", rdev->use_count);
495 static ssize_t regulator_type_show(struct device *dev,
496 struct device_attribute *attr, char *buf)
498 struct regulator_dev *rdev = dev_get_drvdata(dev);
500 switch (rdev->desc->type) {
501 case REGULATOR_VOLTAGE:
502 return sprintf(buf, "voltage\n");
503 case REGULATOR_CURRENT:
504 return sprintf(buf, "current\n");
506 return sprintf(buf, "unknown\n");
509 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
510 struct device_attribute *attr, char *buf)
512 struct regulator_dev *rdev = dev_get_drvdata(dev);
514 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
516 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
517 regulator_suspend_mem_uV_show, NULL);
519 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
522 struct regulator_dev *rdev = dev_get_drvdata(dev);
524 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
526 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
527 regulator_suspend_disk_uV_show, NULL);
529 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
530 struct device_attribute *attr, char *buf)
532 struct regulator_dev *rdev = dev_get_drvdata(dev);
534 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
536 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
537 regulator_suspend_standby_uV_show, NULL);
539 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
542 struct regulator_dev *rdev = dev_get_drvdata(dev);
544 return regulator_print_opmode(buf,
545 rdev->constraints->state_mem.mode);
547 static DEVICE_ATTR(suspend_mem_mode, 0444,
548 regulator_suspend_mem_mode_show, NULL);
550 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
551 struct device_attribute *attr, char *buf)
553 struct regulator_dev *rdev = dev_get_drvdata(dev);
555 return regulator_print_opmode(buf,
556 rdev->constraints->state_disk.mode);
558 static DEVICE_ATTR(suspend_disk_mode, 0444,
559 regulator_suspend_disk_mode_show, NULL);
561 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
562 struct device_attribute *attr, char *buf)
564 struct regulator_dev *rdev = dev_get_drvdata(dev);
566 return regulator_print_opmode(buf,
567 rdev->constraints->state_standby.mode);
569 static DEVICE_ATTR(suspend_standby_mode, 0444,
570 regulator_suspend_standby_mode_show, NULL);
572 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
575 struct regulator_dev *rdev = dev_get_drvdata(dev);
577 return regulator_print_state(buf,
578 rdev->constraints->state_mem.enabled);
580 static DEVICE_ATTR(suspend_mem_state, 0444,
581 regulator_suspend_mem_state_show, NULL);
583 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
584 struct device_attribute *attr, char *buf)
586 struct regulator_dev *rdev = dev_get_drvdata(dev);
588 return regulator_print_state(buf,
589 rdev->constraints->state_disk.enabled);
591 static DEVICE_ATTR(suspend_disk_state, 0444,
592 regulator_suspend_disk_state_show, NULL);
594 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
595 struct device_attribute *attr, char *buf)
597 struct regulator_dev *rdev = dev_get_drvdata(dev);
599 return regulator_print_state(buf,
600 rdev->constraints->state_standby.enabled);
602 static DEVICE_ATTR(suspend_standby_state, 0444,
603 regulator_suspend_standby_state_show, NULL);
607 * These are the only attributes are present for all regulators.
608 * Other attributes are a function of regulator functionality.
610 static struct device_attribute regulator_dev_attrs[] = {
611 __ATTR(name, 0444, regulator_name_show, NULL),
612 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
613 __ATTR(type, 0444, regulator_type_show, NULL),
617 static void regulator_dev_release(struct device *dev)
619 struct regulator_dev *rdev = dev_get_drvdata(dev);
623 static struct class regulator_class = {
625 .dev_release = regulator_dev_release,
626 .dev_attrs = regulator_dev_attrs,
629 /* Calculate the new optimum regulator operating mode based on the new total
630 * consumer load. All locks held by caller */
631 static void drms_uA_update(struct regulator_dev *rdev)
633 struct regulator *sibling;
634 int current_uA = 0, output_uV, input_uV, err;
637 err = regulator_check_drms(rdev);
638 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
639 (!rdev->desc->ops->get_voltage &&
640 !rdev->desc->ops->get_voltage_sel) ||
641 !rdev->desc->ops->set_mode)
644 /* get output voltage */
645 output_uV = _regulator_get_voltage(rdev);
649 /* get input voltage */
652 input_uV = _regulator_get_voltage(rdev);
654 input_uV = rdev->constraints->input_uV;
658 /* calc total requested load */
659 list_for_each_entry(sibling, &rdev->consumer_list, list)
660 current_uA += sibling->uA_load;
662 /* now get the optimum mode for our new total regulator load */
663 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
664 output_uV, current_uA);
666 /* check the new mode is allowed */
667 err = regulator_mode_constrain(rdev, &mode);
669 rdev->desc->ops->set_mode(rdev, mode);
672 static int suspend_set_state(struct regulator_dev *rdev,
673 struct regulator_state *rstate)
678 can_set_state = rdev->desc->ops->set_suspend_enable &&
679 rdev->desc->ops->set_suspend_disable;
681 /* If we have no suspend mode configration don't set anything;
682 * only warn if the driver actually makes the suspend mode
685 if (!rstate->enabled && !rstate->disabled) {
687 rdev_warn(rdev, "No configuration\n");
691 if (rstate->enabled && rstate->disabled) {
692 rdev_err(rdev, "invalid configuration\n");
696 if (!can_set_state) {
697 rdev_err(rdev, "no way to set suspend state\n");
702 ret = rdev->desc->ops->set_suspend_enable(rdev);
704 ret = rdev->desc->ops->set_suspend_disable(rdev);
706 rdev_err(rdev, "failed to enabled/disable\n");
710 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
711 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
713 rdev_err(rdev, "failed to set voltage\n");
718 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
719 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
721 rdev_err(rdev, "failed to set mode\n");
728 /* locks held by caller */
729 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
731 if (!rdev->constraints)
735 case PM_SUSPEND_STANDBY:
736 return suspend_set_state(rdev,
737 &rdev->constraints->state_standby);
739 return suspend_set_state(rdev,
740 &rdev->constraints->state_mem);
742 return suspend_set_state(rdev,
743 &rdev->constraints->state_disk);
749 static void print_constraints(struct regulator_dev *rdev)
751 struct regulation_constraints *constraints = rdev->constraints;
756 if (constraints->min_uV && constraints->max_uV) {
757 if (constraints->min_uV == constraints->max_uV)
758 count += sprintf(buf + count, "%d mV ",
759 constraints->min_uV / 1000);
761 count += sprintf(buf + count, "%d <--> %d mV ",
762 constraints->min_uV / 1000,
763 constraints->max_uV / 1000);
766 if (!constraints->min_uV ||
767 constraints->min_uV != constraints->max_uV) {
768 ret = _regulator_get_voltage(rdev);
770 count += sprintf(buf + count, "at %d mV ", ret / 1000);
773 if (constraints->uV_offset)
774 count += sprintf(buf, "%dmV offset ",
775 constraints->uV_offset / 1000);
777 if (constraints->min_uA && constraints->max_uA) {
778 if (constraints->min_uA == constraints->max_uA)
779 count += sprintf(buf + count, "%d mA ",
780 constraints->min_uA / 1000);
782 count += sprintf(buf + count, "%d <--> %d mA ",
783 constraints->min_uA / 1000,
784 constraints->max_uA / 1000);
787 if (!constraints->min_uA ||
788 constraints->min_uA != constraints->max_uA) {
789 ret = _regulator_get_current_limit(rdev);
791 count += sprintf(buf + count, "at %d mA ", ret / 1000);
794 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
795 count += sprintf(buf + count, "fast ");
796 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
797 count += sprintf(buf + count, "normal ");
798 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
799 count += sprintf(buf + count, "idle ");
800 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
801 count += sprintf(buf + count, "standby");
803 rdev_info(rdev, "%s\n", buf);
805 if ((constraints->min_uV != constraints->max_uV) &&
806 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
808 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
811 static int machine_constraints_voltage(struct regulator_dev *rdev,
812 struct regulation_constraints *constraints)
814 struct regulator_ops *ops = rdev->desc->ops;
817 /* do we need to apply the constraint voltage */
818 if (rdev->constraints->apply_uV &&
819 rdev->constraints->min_uV == rdev->constraints->max_uV) {
820 ret = _regulator_do_set_voltage(rdev,
821 rdev->constraints->min_uV,
822 rdev->constraints->max_uV);
824 rdev_err(rdev, "failed to apply %duV constraint\n",
825 rdev->constraints->min_uV);
830 /* constrain machine-level voltage specs to fit
831 * the actual range supported by this regulator.
833 if (ops->list_voltage && rdev->desc->n_voltages) {
834 int count = rdev->desc->n_voltages;
836 int min_uV = INT_MAX;
837 int max_uV = INT_MIN;
838 int cmin = constraints->min_uV;
839 int cmax = constraints->max_uV;
841 /* it's safe to autoconfigure fixed-voltage supplies
842 and the constraints are used by list_voltage. */
843 if (count == 1 && !cmin) {
846 constraints->min_uV = cmin;
847 constraints->max_uV = cmax;
850 /* voltage constraints are optional */
851 if ((cmin == 0) && (cmax == 0))
854 /* else require explicit machine-level constraints */
855 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
856 rdev_err(rdev, "invalid voltage constraints\n");
860 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
861 for (i = 0; i < count; i++) {
864 value = ops->list_voltage(rdev, i);
868 /* maybe adjust [min_uV..max_uV] */
869 if (value >= cmin && value < min_uV)
871 if (value <= cmax && value > max_uV)
875 /* final: [min_uV..max_uV] valid iff constraints valid */
876 if (max_uV < min_uV) {
877 rdev_err(rdev, "unsupportable voltage constraints\n");
881 /* use regulator's subset of machine constraints */
882 if (constraints->min_uV < min_uV) {
883 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
884 constraints->min_uV, min_uV);
885 constraints->min_uV = min_uV;
887 if (constraints->max_uV > max_uV) {
888 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
889 constraints->max_uV, max_uV);
890 constraints->max_uV = max_uV;
898 * set_machine_constraints - sets regulator constraints
899 * @rdev: regulator source
900 * @constraints: constraints to apply
902 * Allows platform initialisation code to define and constrain
903 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
904 * Constraints *must* be set by platform code in order for some
905 * regulator operations to proceed i.e. set_voltage, set_current_limit,
908 static int set_machine_constraints(struct regulator_dev *rdev,
909 const struct regulation_constraints *constraints)
912 struct regulator_ops *ops = rdev->desc->ops;
915 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
918 rdev->constraints = kzalloc(sizeof(*constraints),
920 if (!rdev->constraints)
923 ret = machine_constraints_voltage(rdev, rdev->constraints);
927 /* do we need to setup our suspend state */
928 if (rdev->constraints->initial_state) {
929 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
931 rdev_err(rdev, "failed to set suspend state\n");
936 if (rdev->constraints->initial_mode) {
937 if (!ops->set_mode) {
938 rdev_err(rdev, "no set_mode operation\n");
943 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
945 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
950 /* If the constraints say the regulator should be on at this point
951 * and we have control then make sure it is enabled.
953 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
955 ret = ops->enable(rdev);
957 rdev_err(rdev, "failed to enable\n");
962 print_constraints(rdev);
965 kfree(rdev->constraints);
966 rdev->constraints = NULL;
971 * set_supply - set regulator supply regulator
972 * @rdev: regulator name
973 * @supply_rdev: supply regulator name
975 * Called by platform initialisation code to set the supply regulator for this
976 * regulator. This ensures that a regulators supply will also be enabled by the
977 * core if it's child is enabled.
979 static int set_supply(struct regulator_dev *rdev,
980 struct regulator_dev *supply_rdev)
984 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
986 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
987 if (rdev->supply == NULL) {
996 * set_consumer_device_supply - Bind a regulator to a symbolic supply
997 * @rdev: regulator source
998 * @consumer_dev: device the supply applies to
999 * @consumer_dev_name: dev_name() string for device supply applies to
1000 * @supply: symbolic name for supply
1002 * Allows platform initialisation code to map physical regulator
1003 * sources to symbolic names for supplies for use by devices. Devices
1004 * should use these symbolic names to request regulators, avoiding the
1005 * need to provide board-specific regulator names as platform data.
1007 * Only one of consumer_dev and consumer_dev_name may be specified.
1009 static int set_consumer_device_supply(struct regulator_dev *rdev,
1010 struct device *consumer_dev, const char *consumer_dev_name,
1013 struct regulator_map *node;
1016 if (consumer_dev && consumer_dev_name)
1019 if (!consumer_dev_name && consumer_dev)
1020 consumer_dev_name = dev_name(consumer_dev);
1025 if (consumer_dev_name != NULL)
1030 list_for_each_entry(node, ®ulator_map_list, list) {
1031 if (node->dev_name && consumer_dev_name) {
1032 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1034 } else if (node->dev_name || consumer_dev_name) {
1038 if (strcmp(node->supply, supply) != 0)
1041 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
1042 dev_name(&node->regulator->dev),
1043 node->regulator->desc->name,
1045 dev_name(&rdev->dev), rdev_get_name(rdev));
1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1053 node->regulator = rdev;
1054 node->supply = supply;
1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1058 if (node->dev_name == NULL) {
1064 list_add(&node->list, ®ulator_map_list);
1068 static void unset_regulator_supplies(struct regulator_dev *rdev)
1070 struct regulator_map *node, *n;
1072 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
1073 if (rdev == node->regulator) {
1074 list_del(&node->list);
1075 kfree(node->dev_name);
1081 #define REG_STR_SIZE 64
1083 static struct regulator *create_regulator(struct regulator_dev *rdev,
1085 const char *supply_name)
1087 struct regulator *regulator;
1088 char buf[REG_STR_SIZE];
1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1092 if (regulator == NULL)
1095 mutex_lock(&rdev->mutex);
1096 regulator->rdev = rdev;
1097 list_add(®ulator->list, &rdev->consumer_list);
1100 /* create a 'requested_microamps_name' sysfs entry */
1101 size = scnprintf(buf, REG_STR_SIZE,
1102 "microamps_requested_%s-%s",
1103 dev_name(dev), supply_name);
1104 if (size >= REG_STR_SIZE)
1107 regulator->dev = dev;
1108 sysfs_attr_init(®ulator->dev_attr.attr);
1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1110 if (regulator->dev_attr.attr.name == NULL)
1113 regulator->dev_attr.attr.mode = 0444;
1114 regulator->dev_attr.show = device_requested_uA_show;
1115 err = device_create_file(dev, ®ulator->dev_attr);
1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1121 /* also add a link to the device sysfs entry */
1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1123 dev->kobj.name, supply_name);
1124 if (size >= REG_STR_SIZE)
1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1128 if (regulator->supply_name == NULL)
1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1134 rdev_warn(rdev, "could not add device link %s err %d\n",
1135 dev->kobj.name, err);
1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1140 if (regulator->supply_name == NULL)
1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1146 if (!regulator->debugfs) {
1147 rdev_warn(rdev, "Failed to create debugfs directory\n");
1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1150 ®ulator->uA_load);
1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1152 ®ulator->min_uV);
1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1154 ®ulator->max_uV);
1157 mutex_unlock(&rdev->mutex);
1160 kfree(regulator->supply_name);
1162 device_remove_file(regulator->dev, ®ulator->dev_attr);
1164 kfree(regulator->dev_attr.attr.name);
1166 list_del(®ulator->list);
1168 mutex_unlock(&rdev->mutex);
1172 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1174 if (!rdev->desc->ops->enable_time)
1176 return rdev->desc->ops->enable_time(rdev);
1179 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1182 struct regulator_dev *r;
1183 struct device_node *node;
1185 /* first do a dt based lookup */
1186 if (dev && dev->of_node) {
1187 node = of_get_regulator(dev, supply);
1189 list_for_each_entry(r, ®ulator_list, list)
1190 if (r->dev.parent &&
1191 node == r->dev.of_node)
1195 /* if not found, try doing it non-dt way */
1196 list_for_each_entry(r, ®ulator_list, list)
1197 if (strcmp(rdev_get_name(r), supply) == 0)
1203 /* Internal regulator request function */
1204 static struct regulator *_regulator_get(struct device *dev, const char *id,
1207 struct regulator_dev *rdev;
1208 struct regulator_map *map;
1209 struct regulator *regulator = ERR_PTR(-ENODEV);
1210 const char *devname = NULL;
1214 pr_err("get() with no identifier\n");
1219 devname = dev_name(dev);
1221 mutex_lock(®ulator_list_mutex);
1223 rdev = regulator_dev_lookup(dev, id);
1227 list_for_each_entry(map, ®ulator_map_list, list) {
1228 /* If the mapping has a device set up it must match */
1229 if (map->dev_name &&
1230 (!devname || strcmp(map->dev_name, devname)))
1233 if (strcmp(map->supply, id) == 0) {
1234 rdev = map->regulator;
1239 if (board_wants_dummy_regulator) {
1240 rdev = dummy_regulator_rdev;
1244 #ifdef CONFIG_REGULATOR_DUMMY
1246 devname = "deviceless";
1248 /* If the board didn't flag that it was fully constrained then
1249 * substitute in a dummy regulator so consumers can continue.
1251 if (!has_full_constraints) {
1252 pr_warn("%s supply %s not found, using dummy regulator\n",
1254 rdev = dummy_regulator_rdev;
1259 mutex_unlock(®ulator_list_mutex);
1263 if (rdev->exclusive) {
1264 regulator = ERR_PTR(-EPERM);
1268 if (exclusive && rdev->open_count) {
1269 regulator = ERR_PTR(-EBUSY);
1273 if (!try_module_get(rdev->owner))
1276 regulator = create_regulator(rdev, dev, id);
1277 if (regulator == NULL) {
1278 regulator = ERR_PTR(-ENOMEM);
1279 module_put(rdev->owner);
1285 rdev->exclusive = 1;
1287 ret = _regulator_is_enabled(rdev);
1289 rdev->use_count = 1;
1291 rdev->use_count = 0;
1295 mutex_unlock(®ulator_list_mutex);
1301 * regulator_get - lookup and obtain a reference to a regulator.
1302 * @dev: device for regulator "consumer"
1303 * @id: Supply name or regulator ID.
1305 * Returns a struct regulator corresponding to the regulator producer,
1306 * or IS_ERR() condition containing errno.
1308 * Use of supply names configured via regulator_set_device_supply() is
1309 * strongly encouraged. It is recommended that the supply name used
1310 * should match the name used for the supply and/or the relevant
1311 * device pins in the datasheet.
1313 struct regulator *regulator_get(struct device *dev, const char *id)
1315 return _regulator_get(dev, id, 0);
1317 EXPORT_SYMBOL_GPL(regulator_get);
1320 * regulator_get_exclusive - obtain exclusive access to a regulator.
1321 * @dev: device for regulator "consumer"
1322 * @id: Supply name or regulator ID.
1324 * Returns a struct regulator corresponding to the regulator producer,
1325 * or IS_ERR() condition containing errno. Other consumers will be
1326 * unable to obtain this reference is held and the use count for the
1327 * regulator will be initialised to reflect the current state of the
1330 * This is intended for use by consumers which cannot tolerate shared
1331 * use of the regulator such as those which need to force the
1332 * regulator off for correct operation of the hardware they are
1335 * Use of supply names configured via regulator_set_device_supply() is
1336 * strongly encouraged. It is recommended that the supply name used
1337 * should match the name used for the supply and/or the relevant
1338 * device pins in the datasheet.
1340 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1342 return _regulator_get(dev, id, 1);
1344 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1347 * regulator_put - "free" the regulator source
1348 * @regulator: regulator source
1350 * Note: drivers must ensure that all regulator_enable calls made on this
1351 * regulator source are balanced by regulator_disable calls prior to calling
1354 void regulator_put(struct regulator *regulator)
1356 struct regulator_dev *rdev;
1358 if (regulator == NULL || IS_ERR(regulator))
1361 mutex_lock(®ulator_list_mutex);
1362 rdev = regulator->rdev;
1364 debugfs_remove_recursive(regulator->debugfs);
1366 /* remove any sysfs entries */
1367 if (regulator->dev) {
1368 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1369 device_remove_file(regulator->dev, ®ulator->dev_attr);
1370 kfree(regulator->dev_attr.attr.name);
1372 kfree(regulator->supply_name);
1373 list_del(®ulator->list);
1377 rdev->exclusive = 0;
1379 module_put(rdev->owner);
1380 mutex_unlock(®ulator_list_mutex);
1382 EXPORT_SYMBOL_GPL(regulator_put);
1384 static int _regulator_can_change_status(struct regulator_dev *rdev)
1386 if (!rdev->constraints)
1389 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1395 /* locks held by regulator_enable() */
1396 static int _regulator_enable(struct regulator_dev *rdev)
1400 /* check voltage and requested load before enabling */
1401 if (rdev->constraints &&
1402 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1403 drms_uA_update(rdev);
1405 if (rdev->use_count == 0) {
1406 /* The regulator may on if it's not switchable or left on */
1407 ret = _regulator_is_enabled(rdev);
1408 if (ret == -EINVAL || ret == 0) {
1409 if (!_regulator_can_change_status(rdev))
1412 if (!rdev->desc->ops->enable)
1415 /* Query before enabling in case configuration
1417 ret = _regulator_get_enable_time(rdev);
1421 rdev_warn(rdev, "enable_time() failed: %d\n",
1426 trace_regulator_enable(rdev_get_name(rdev));
1428 /* Allow the regulator to ramp; it would be useful
1429 * to extend this for bulk operations so that the
1430 * regulators can ramp together. */
1431 ret = rdev->desc->ops->enable(rdev);
1435 trace_regulator_enable_delay(rdev_get_name(rdev));
1437 if (delay >= 1000) {
1438 mdelay(delay / 1000);
1439 udelay(delay % 1000);
1444 trace_regulator_enable_complete(rdev_get_name(rdev));
1446 } else if (ret < 0) {
1447 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1450 /* Fallthrough on positive return values - already enabled */
1459 * regulator_enable - enable regulator output
1460 * @regulator: regulator source
1462 * Request that the regulator be enabled with the regulator output at
1463 * the predefined voltage or current value. Calls to regulator_enable()
1464 * must be balanced with calls to regulator_disable().
1466 * NOTE: the output value can be set by other drivers, boot loader or may be
1467 * hardwired in the regulator.
1469 int regulator_enable(struct regulator *regulator)
1471 struct regulator_dev *rdev = regulator->rdev;
1475 ret = regulator_enable(rdev->supply);
1480 mutex_lock(&rdev->mutex);
1481 ret = _regulator_enable(rdev);
1482 mutex_unlock(&rdev->mutex);
1484 if (ret != 0 && rdev->supply)
1485 regulator_disable(rdev->supply);
1489 EXPORT_SYMBOL_GPL(regulator_enable);
1491 /* locks held by regulator_disable() */
1492 static int _regulator_disable(struct regulator_dev *rdev)
1496 if (WARN(rdev->use_count <= 0,
1497 "unbalanced disables for %s\n", rdev_get_name(rdev)))
1500 /* are we the last user and permitted to disable ? */
1501 if (rdev->use_count == 1 &&
1502 (rdev->constraints && !rdev->constraints->always_on)) {
1504 /* we are last user */
1505 if (_regulator_can_change_status(rdev) &&
1506 rdev->desc->ops->disable) {
1507 trace_regulator_disable(rdev_get_name(rdev));
1509 ret = rdev->desc->ops->disable(rdev);
1511 rdev_err(rdev, "failed to disable\n");
1515 trace_regulator_disable_complete(rdev_get_name(rdev));
1517 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1521 rdev->use_count = 0;
1522 } else if (rdev->use_count > 1) {
1524 if (rdev->constraints &&
1525 (rdev->constraints->valid_ops_mask &
1526 REGULATOR_CHANGE_DRMS))
1527 drms_uA_update(rdev);
1536 * regulator_disable - disable regulator output
1537 * @regulator: regulator source
1539 * Disable the regulator output voltage or current. Calls to
1540 * regulator_enable() must be balanced with calls to
1541 * regulator_disable().
1543 * NOTE: this will only disable the regulator output if no other consumer
1544 * devices have it enabled, the regulator device supports disabling and
1545 * machine constraints permit this operation.
1547 int regulator_disable(struct regulator *regulator)
1549 struct regulator_dev *rdev = regulator->rdev;
1552 mutex_lock(&rdev->mutex);
1553 ret = _regulator_disable(rdev);
1554 mutex_unlock(&rdev->mutex);
1556 if (ret == 0 && rdev->supply)
1557 regulator_disable(rdev->supply);
1561 EXPORT_SYMBOL_GPL(regulator_disable);
1563 /* locks held by regulator_force_disable() */
1564 static int _regulator_force_disable(struct regulator_dev *rdev)
1569 if (rdev->desc->ops->disable) {
1570 /* ah well, who wants to live forever... */
1571 ret = rdev->desc->ops->disable(rdev);
1573 rdev_err(rdev, "failed to force disable\n");
1576 /* notify other consumers that power has been forced off */
1577 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1578 REGULATOR_EVENT_DISABLE, NULL);
1585 * regulator_force_disable - force disable regulator output
1586 * @regulator: regulator source
1588 * Forcibly disable the regulator output voltage or current.
1589 * NOTE: this *will* disable the regulator output even if other consumer
1590 * devices have it enabled. This should be used for situations when device
1591 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1593 int regulator_force_disable(struct regulator *regulator)
1595 struct regulator_dev *rdev = regulator->rdev;
1598 mutex_lock(&rdev->mutex);
1599 regulator->uA_load = 0;
1600 ret = _regulator_force_disable(regulator->rdev);
1601 mutex_unlock(&rdev->mutex);
1604 while (rdev->open_count--)
1605 regulator_disable(rdev->supply);
1609 EXPORT_SYMBOL_GPL(regulator_force_disable);
1611 static void regulator_disable_work(struct work_struct *work)
1613 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1617 mutex_lock(&rdev->mutex);
1619 BUG_ON(!rdev->deferred_disables);
1621 count = rdev->deferred_disables;
1622 rdev->deferred_disables = 0;
1624 for (i = 0; i < count; i++) {
1625 ret = _regulator_disable(rdev);
1627 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1630 mutex_unlock(&rdev->mutex);
1633 for (i = 0; i < count; i++) {
1634 ret = regulator_disable(rdev->supply);
1637 "Supply disable failed: %d\n", ret);
1644 * regulator_disable_deferred - disable regulator output with delay
1645 * @regulator: regulator source
1646 * @ms: miliseconds until the regulator is disabled
1648 * Execute regulator_disable() on the regulator after a delay. This
1649 * is intended for use with devices that require some time to quiesce.
1651 * NOTE: this will only disable the regulator output if no other consumer
1652 * devices have it enabled, the regulator device supports disabling and
1653 * machine constraints permit this operation.
1655 int regulator_disable_deferred(struct regulator *regulator, int ms)
1657 struct regulator_dev *rdev = regulator->rdev;
1660 mutex_lock(&rdev->mutex);
1661 rdev->deferred_disables++;
1662 mutex_unlock(&rdev->mutex);
1664 ret = schedule_delayed_work(&rdev->disable_work,
1665 msecs_to_jiffies(ms));
1671 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1673 static int _regulator_is_enabled(struct regulator_dev *rdev)
1675 /* If we don't know then assume that the regulator is always on */
1676 if (!rdev->desc->ops->is_enabled)
1679 return rdev->desc->ops->is_enabled(rdev);
1683 * regulator_is_enabled - is the regulator output enabled
1684 * @regulator: regulator source
1686 * Returns positive if the regulator driver backing the source/client
1687 * has requested that the device be enabled, zero if it hasn't, else a
1688 * negative errno code.
1690 * Note that the device backing this regulator handle can have multiple
1691 * users, so it might be enabled even if regulator_enable() was never
1692 * called for this particular source.
1694 int regulator_is_enabled(struct regulator *regulator)
1698 mutex_lock(®ulator->rdev->mutex);
1699 ret = _regulator_is_enabled(regulator->rdev);
1700 mutex_unlock(®ulator->rdev->mutex);
1704 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1707 * regulator_count_voltages - count regulator_list_voltage() selectors
1708 * @regulator: regulator source
1710 * Returns number of selectors, or negative errno. Selectors are
1711 * numbered starting at zero, and typically correspond to bitfields
1712 * in hardware registers.
1714 int regulator_count_voltages(struct regulator *regulator)
1716 struct regulator_dev *rdev = regulator->rdev;
1718 return rdev->desc->n_voltages ? : -EINVAL;
1720 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1723 * regulator_list_voltage - enumerate supported voltages
1724 * @regulator: regulator source
1725 * @selector: identify voltage to list
1726 * Context: can sleep
1728 * Returns a voltage that can be passed to @regulator_set_voltage(),
1729 * zero if this selector code can't be used on this system, or a
1732 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1734 struct regulator_dev *rdev = regulator->rdev;
1735 struct regulator_ops *ops = rdev->desc->ops;
1738 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1741 mutex_lock(&rdev->mutex);
1742 ret = ops->list_voltage(rdev, selector);
1743 mutex_unlock(&rdev->mutex);
1746 if (ret < rdev->constraints->min_uV)
1748 else if (ret > rdev->constraints->max_uV)
1754 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1757 * regulator_is_supported_voltage - check if a voltage range can be supported
1759 * @regulator: Regulator to check.
1760 * @min_uV: Minimum required voltage in uV.
1761 * @max_uV: Maximum required voltage in uV.
1763 * Returns a boolean or a negative error code.
1765 int regulator_is_supported_voltage(struct regulator *regulator,
1766 int min_uV, int max_uV)
1768 int i, voltages, ret;
1770 ret = regulator_count_voltages(regulator);
1775 for (i = 0; i < voltages; i++) {
1776 ret = regulator_list_voltage(regulator, i);
1778 if (ret >= min_uV && ret <= max_uV)
1784 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
1786 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1787 int min_uV, int max_uV)
1791 unsigned int selector;
1793 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1795 min_uV += rdev->constraints->uV_offset;
1796 max_uV += rdev->constraints->uV_offset;
1798 if (rdev->desc->ops->set_voltage) {
1799 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1802 if (rdev->desc->ops->list_voltage)
1803 selector = rdev->desc->ops->list_voltage(rdev,
1807 } else if (rdev->desc->ops->set_voltage_sel) {
1808 int best_val = INT_MAX;
1813 /* Find the smallest voltage that falls within the specified
1816 for (i = 0; i < rdev->desc->n_voltages; i++) {
1817 ret = rdev->desc->ops->list_voltage(rdev, i);
1821 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1828 * If we can't obtain the old selector there is not enough
1829 * info to call set_voltage_time_sel().
1831 if (rdev->desc->ops->set_voltage_time_sel &&
1832 rdev->desc->ops->get_voltage_sel) {
1833 unsigned int old_selector = 0;
1835 ret = rdev->desc->ops->get_voltage_sel(rdev);
1839 ret = rdev->desc->ops->set_voltage_time_sel(rdev,
1840 old_selector, selector);
1842 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", ret);
1847 if (best_val != INT_MAX) {
1848 ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1849 selector = best_val;
1857 /* Insert any necessary delays */
1858 if (delay >= 1000) {
1859 mdelay(delay / 1000);
1860 udelay(delay % 1000);
1866 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1869 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1875 * regulator_set_voltage - set regulator output voltage
1876 * @regulator: regulator source
1877 * @min_uV: Minimum required voltage in uV
1878 * @max_uV: Maximum acceptable voltage in uV
1880 * Sets a voltage regulator to the desired output voltage. This can be set
1881 * during any regulator state. IOW, regulator can be disabled or enabled.
1883 * If the regulator is enabled then the voltage will change to the new value
1884 * immediately otherwise if the regulator is disabled the regulator will
1885 * output at the new voltage when enabled.
1887 * NOTE: If the regulator is shared between several devices then the lowest
1888 * request voltage that meets the system constraints will be used.
1889 * Regulator system constraints must be set for this regulator before
1890 * calling this function otherwise this call will fail.
1892 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1894 struct regulator_dev *rdev = regulator->rdev;
1897 mutex_lock(&rdev->mutex);
1899 /* If we're setting the same range as last time the change
1900 * should be a noop (some cpufreq implementations use the same
1901 * voltage for multiple frequencies, for example).
1903 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1907 if (!rdev->desc->ops->set_voltage &&
1908 !rdev->desc->ops->set_voltage_sel) {
1913 /* constraints check */
1914 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1917 regulator->min_uV = min_uV;
1918 regulator->max_uV = max_uV;
1920 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1924 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1927 mutex_unlock(&rdev->mutex);
1930 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1933 * regulator_set_voltage_time - get raise/fall time
1934 * @regulator: regulator source
1935 * @old_uV: starting voltage in microvolts
1936 * @new_uV: target voltage in microvolts
1938 * Provided with the starting and ending voltage, this function attempts to
1939 * calculate the time in microseconds required to rise or fall to this new
1942 int regulator_set_voltage_time(struct regulator *regulator,
1943 int old_uV, int new_uV)
1945 struct regulator_dev *rdev = regulator->rdev;
1946 struct regulator_ops *ops = rdev->desc->ops;
1952 /* Currently requires operations to do this */
1953 if (!ops->list_voltage || !ops->set_voltage_time_sel
1954 || !rdev->desc->n_voltages)
1957 for (i = 0; i < rdev->desc->n_voltages; i++) {
1958 /* We only look for exact voltage matches here */
1959 voltage = regulator_list_voltage(regulator, i);
1964 if (voltage == old_uV)
1966 if (voltage == new_uV)
1970 if (old_sel < 0 || new_sel < 0)
1973 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
1975 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
1978 * regulator_sync_voltage - re-apply last regulator output voltage
1979 * @regulator: regulator source
1981 * Re-apply the last configured voltage. This is intended to be used
1982 * where some external control source the consumer is cooperating with
1983 * has caused the configured voltage to change.
1985 int regulator_sync_voltage(struct regulator *regulator)
1987 struct regulator_dev *rdev = regulator->rdev;
1988 int ret, min_uV, max_uV;
1990 mutex_lock(&rdev->mutex);
1992 if (!rdev->desc->ops->set_voltage &&
1993 !rdev->desc->ops->set_voltage_sel) {
1998 /* This is only going to work if we've had a voltage configured. */
1999 if (!regulator->min_uV && !regulator->max_uV) {
2004 min_uV = regulator->min_uV;
2005 max_uV = regulator->max_uV;
2007 /* This should be a paranoia check... */
2008 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2012 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2016 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2019 mutex_unlock(&rdev->mutex);
2022 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2024 static int _regulator_get_voltage(struct regulator_dev *rdev)
2028 if (rdev->desc->ops->get_voltage_sel) {
2029 sel = rdev->desc->ops->get_voltage_sel(rdev);
2032 ret = rdev->desc->ops->list_voltage(rdev, sel);
2033 } else if (rdev->desc->ops->get_voltage) {
2034 ret = rdev->desc->ops->get_voltage(rdev);
2041 return ret - rdev->constraints->uV_offset;
2045 * regulator_get_voltage - get regulator output voltage
2046 * @regulator: regulator source
2048 * This returns the current regulator voltage in uV.
2050 * NOTE: If the regulator is disabled it will return the voltage value. This
2051 * function should not be used to determine regulator state.
2053 int regulator_get_voltage(struct regulator *regulator)
2057 mutex_lock(®ulator->rdev->mutex);
2059 ret = _regulator_get_voltage(regulator->rdev);
2061 mutex_unlock(®ulator->rdev->mutex);
2065 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2068 * regulator_set_current_limit - set regulator output current limit
2069 * @regulator: regulator source
2070 * @min_uA: Minimuum supported current in uA
2071 * @max_uA: Maximum supported current in uA
2073 * Sets current sink to the desired output current. This can be set during
2074 * any regulator state. IOW, regulator can be disabled or enabled.
2076 * If the regulator is enabled then the current will change to the new value
2077 * immediately otherwise if the regulator is disabled the regulator will
2078 * output at the new current when enabled.
2080 * NOTE: Regulator system constraints must be set for this regulator before
2081 * calling this function otherwise this call will fail.
2083 int regulator_set_current_limit(struct regulator *regulator,
2084 int min_uA, int max_uA)
2086 struct regulator_dev *rdev = regulator->rdev;
2089 mutex_lock(&rdev->mutex);
2092 if (!rdev->desc->ops->set_current_limit) {
2097 /* constraints check */
2098 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2102 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2104 mutex_unlock(&rdev->mutex);
2107 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2109 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2113 mutex_lock(&rdev->mutex);
2116 if (!rdev->desc->ops->get_current_limit) {
2121 ret = rdev->desc->ops->get_current_limit(rdev);
2123 mutex_unlock(&rdev->mutex);
2128 * regulator_get_current_limit - get regulator output current
2129 * @regulator: regulator source
2131 * This returns the current supplied by the specified current sink in uA.
2133 * NOTE: If the regulator is disabled it will return the current value. This
2134 * function should not be used to determine regulator state.
2136 int regulator_get_current_limit(struct regulator *regulator)
2138 return _regulator_get_current_limit(regulator->rdev);
2140 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2143 * regulator_set_mode - set regulator operating mode
2144 * @regulator: regulator source
2145 * @mode: operating mode - one of the REGULATOR_MODE constants
2147 * Set regulator operating mode to increase regulator efficiency or improve
2148 * regulation performance.
2150 * NOTE: Regulator system constraints must be set for this regulator before
2151 * calling this function otherwise this call will fail.
2153 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2155 struct regulator_dev *rdev = regulator->rdev;
2157 int regulator_curr_mode;
2159 mutex_lock(&rdev->mutex);
2162 if (!rdev->desc->ops->set_mode) {
2167 /* return if the same mode is requested */
2168 if (rdev->desc->ops->get_mode) {
2169 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2170 if (regulator_curr_mode == mode) {
2176 /* constraints check */
2177 ret = regulator_mode_constrain(rdev, &mode);
2181 ret = rdev->desc->ops->set_mode(rdev, mode);
2183 mutex_unlock(&rdev->mutex);
2186 EXPORT_SYMBOL_GPL(regulator_set_mode);
2188 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2192 mutex_lock(&rdev->mutex);
2195 if (!rdev->desc->ops->get_mode) {
2200 ret = rdev->desc->ops->get_mode(rdev);
2202 mutex_unlock(&rdev->mutex);
2207 * regulator_get_mode - get regulator operating mode
2208 * @regulator: regulator source
2210 * Get the current regulator operating mode.
2212 unsigned int regulator_get_mode(struct regulator *regulator)
2214 return _regulator_get_mode(regulator->rdev);
2216 EXPORT_SYMBOL_GPL(regulator_get_mode);
2219 * regulator_set_optimum_mode - set regulator optimum operating mode
2220 * @regulator: regulator source
2221 * @uA_load: load current
2223 * Notifies the regulator core of a new device load. This is then used by
2224 * DRMS (if enabled by constraints) to set the most efficient regulator
2225 * operating mode for the new regulator loading.
2227 * Consumer devices notify their supply regulator of the maximum power
2228 * they will require (can be taken from device datasheet in the power
2229 * consumption tables) when they change operational status and hence power
2230 * state. Examples of operational state changes that can affect power
2231 * consumption are :-
2233 * o Device is opened / closed.
2234 * o Device I/O is about to begin or has just finished.
2235 * o Device is idling in between work.
2237 * This information is also exported via sysfs to userspace.
2239 * DRMS will sum the total requested load on the regulator and change
2240 * to the most efficient operating mode if platform constraints allow.
2242 * Returns the new regulator mode or error.
2244 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2246 struct regulator_dev *rdev = regulator->rdev;
2247 struct regulator *consumer;
2248 int ret, output_uV, input_uV, total_uA_load = 0;
2251 mutex_lock(&rdev->mutex);
2254 * first check to see if we can set modes at all, otherwise just
2255 * tell the consumer everything is OK.
2257 regulator->uA_load = uA_load;
2258 ret = regulator_check_drms(rdev);
2264 if (!rdev->desc->ops->get_optimum_mode)
2268 * we can actually do this so any errors are indicators of
2269 * potential real failure.
2273 /* get output voltage */
2274 output_uV = _regulator_get_voltage(rdev);
2275 if (output_uV <= 0) {
2276 rdev_err(rdev, "invalid output voltage found\n");
2280 /* get input voltage */
2283 input_uV = regulator_get_voltage(rdev->supply);
2285 input_uV = rdev->constraints->input_uV;
2286 if (input_uV <= 0) {
2287 rdev_err(rdev, "invalid input voltage found\n");
2291 /* calc total requested load for this regulator */
2292 list_for_each_entry(consumer, &rdev->consumer_list, list)
2293 total_uA_load += consumer->uA_load;
2295 mode = rdev->desc->ops->get_optimum_mode(rdev,
2296 input_uV, output_uV,
2298 ret = regulator_mode_constrain(rdev, &mode);
2300 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2301 total_uA_load, input_uV, output_uV);
2305 ret = rdev->desc->ops->set_mode(rdev, mode);
2307 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2312 mutex_unlock(&rdev->mutex);
2315 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2318 * regulator_register_notifier - register regulator event notifier
2319 * @regulator: regulator source
2320 * @nb: notifier block
2322 * Register notifier block to receive regulator events.
2324 int regulator_register_notifier(struct regulator *regulator,
2325 struct notifier_block *nb)
2327 return blocking_notifier_chain_register(®ulator->rdev->notifier,
2330 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2333 * regulator_unregister_notifier - unregister regulator event notifier
2334 * @regulator: regulator source
2335 * @nb: notifier block
2337 * Unregister regulator event notifier block.
2339 int regulator_unregister_notifier(struct regulator *regulator,
2340 struct notifier_block *nb)
2342 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
2345 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2347 /* notify regulator consumers and downstream regulator consumers.
2348 * Note mutex must be held by caller.
2350 static void _notifier_call_chain(struct regulator_dev *rdev,
2351 unsigned long event, void *data)
2353 /* call rdev chain first */
2354 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2358 * regulator_bulk_get - get multiple regulator consumers
2360 * @dev: Device to supply
2361 * @num_consumers: Number of consumers to register
2362 * @consumers: Configuration of consumers; clients are stored here.
2364 * @return 0 on success, an errno on failure.
2366 * This helper function allows drivers to get several regulator
2367 * consumers in one operation. If any of the regulators cannot be
2368 * acquired then any regulators that were allocated will be freed
2369 * before returning to the caller.
2371 int regulator_bulk_get(struct device *dev, int num_consumers,
2372 struct regulator_bulk_data *consumers)
2377 for (i = 0; i < num_consumers; i++)
2378 consumers[i].consumer = NULL;
2380 for (i = 0; i < num_consumers; i++) {
2381 consumers[i].consumer = regulator_get(dev,
2382 consumers[i].supply);
2383 if (IS_ERR(consumers[i].consumer)) {
2384 ret = PTR_ERR(consumers[i].consumer);
2385 dev_err(dev, "Failed to get supply '%s': %d\n",
2386 consumers[i].supply, ret);
2387 consumers[i].consumer = NULL;
2396 regulator_put(consumers[i].consumer);
2400 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2402 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2404 struct regulator_bulk_data *bulk = data;
2406 bulk->ret = regulator_enable(bulk->consumer);
2410 * regulator_bulk_enable - enable multiple regulator consumers
2412 * @num_consumers: Number of consumers
2413 * @consumers: Consumer data; clients are stored here.
2414 * @return 0 on success, an errno on failure
2416 * This convenience API allows consumers to enable multiple regulator
2417 * clients in a single API call. If any consumers cannot be enabled
2418 * then any others that were enabled will be disabled again prior to
2421 int regulator_bulk_enable(int num_consumers,
2422 struct regulator_bulk_data *consumers)
2424 LIST_HEAD(async_domain);
2428 for (i = 0; i < num_consumers; i++)
2429 async_schedule_domain(regulator_bulk_enable_async,
2430 &consumers[i], &async_domain);
2432 async_synchronize_full_domain(&async_domain);
2434 /* If any consumer failed we need to unwind any that succeeded */
2435 for (i = 0; i < num_consumers; i++) {
2436 if (consumers[i].ret != 0) {
2437 ret = consumers[i].ret;
2445 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2447 regulator_disable(consumers[i].consumer);
2451 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2454 * regulator_bulk_disable - disable multiple regulator consumers
2456 * @num_consumers: Number of consumers
2457 * @consumers: Consumer data; clients are stored here.
2458 * @return 0 on success, an errno on failure
2460 * This convenience API allows consumers to disable multiple regulator
2461 * clients in a single API call. If any consumers cannot be disabled
2462 * then any others that were disabled will be enabled again prior to
2465 int regulator_bulk_disable(int num_consumers,
2466 struct regulator_bulk_data *consumers)
2471 for (i = num_consumers - 1; i >= 0; --i) {
2472 ret = regulator_disable(consumers[i].consumer);
2480 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2481 for (++i; i < num_consumers; ++i)
2482 regulator_enable(consumers[i].consumer);
2486 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2489 * regulator_bulk_force_disable - force disable multiple regulator consumers
2491 * @num_consumers: Number of consumers
2492 * @consumers: Consumer data; clients are stored here.
2493 * @return 0 on success, an errno on failure
2495 * This convenience API allows consumers to forcibly disable multiple regulator
2496 * clients in a single API call.
2497 * NOTE: This should be used for situations when device damage will
2498 * likely occur if the regulators are not disabled (e.g. over temp).
2499 * Although regulator_force_disable function call for some consumers can
2500 * return error numbers, the function is called for all consumers.
2502 int regulator_bulk_force_disable(int num_consumers,
2503 struct regulator_bulk_data *consumers)
2508 for (i = 0; i < num_consumers; i++)
2510 regulator_force_disable(consumers[i].consumer);
2512 for (i = 0; i < num_consumers; i++) {
2513 if (consumers[i].ret != 0) {
2514 ret = consumers[i].ret;
2523 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2526 * regulator_bulk_free - free multiple regulator consumers
2528 * @num_consumers: Number of consumers
2529 * @consumers: Consumer data; clients are stored here.
2531 * This convenience API allows consumers to free multiple regulator
2532 * clients in a single API call.
2534 void regulator_bulk_free(int num_consumers,
2535 struct regulator_bulk_data *consumers)
2539 for (i = 0; i < num_consumers; i++) {
2540 regulator_put(consumers[i].consumer);
2541 consumers[i].consumer = NULL;
2544 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2547 * regulator_notifier_call_chain - call regulator event notifier
2548 * @rdev: regulator source
2549 * @event: notifier block
2550 * @data: callback-specific data.
2552 * Called by regulator drivers to notify clients a regulator event has
2553 * occurred. We also notify regulator clients downstream.
2554 * Note lock must be held by caller.
2556 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2557 unsigned long event, void *data)
2559 _notifier_call_chain(rdev, event, data);
2563 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2566 * regulator_mode_to_status - convert a regulator mode into a status
2568 * @mode: Mode to convert
2570 * Convert a regulator mode into a status.
2572 int regulator_mode_to_status(unsigned int mode)
2575 case REGULATOR_MODE_FAST:
2576 return REGULATOR_STATUS_FAST;
2577 case REGULATOR_MODE_NORMAL:
2578 return REGULATOR_STATUS_NORMAL;
2579 case REGULATOR_MODE_IDLE:
2580 return REGULATOR_STATUS_IDLE;
2581 case REGULATOR_STATUS_STANDBY:
2582 return REGULATOR_STATUS_STANDBY;
2587 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2590 * To avoid cluttering sysfs (and memory) with useless state, only
2591 * create attributes that can be meaningfully displayed.
2593 static int add_regulator_attributes(struct regulator_dev *rdev)
2595 struct device *dev = &rdev->dev;
2596 struct regulator_ops *ops = rdev->desc->ops;
2599 /* some attributes need specific methods to be displayed */
2600 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2601 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
2602 status = device_create_file(dev, &dev_attr_microvolts);
2606 if (ops->get_current_limit) {
2607 status = device_create_file(dev, &dev_attr_microamps);
2611 if (ops->get_mode) {
2612 status = device_create_file(dev, &dev_attr_opmode);
2616 if (ops->is_enabled) {
2617 status = device_create_file(dev, &dev_attr_state);
2621 if (ops->get_status) {
2622 status = device_create_file(dev, &dev_attr_status);
2627 /* some attributes are type-specific */
2628 if (rdev->desc->type == REGULATOR_CURRENT) {
2629 status = device_create_file(dev, &dev_attr_requested_microamps);
2634 /* all the other attributes exist to support constraints;
2635 * don't show them if there are no constraints, or if the
2636 * relevant supporting methods are missing.
2638 if (!rdev->constraints)
2641 /* constraints need specific supporting methods */
2642 if (ops->set_voltage || ops->set_voltage_sel) {
2643 status = device_create_file(dev, &dev_attr_min_microvolts);
2646 status = device_create_file(dev, &dev_attr_max_microvolts);
2650 if (ops->set_current_limit) {
2651 status = device_create_file(dev, &dev_attr_min_microamps);
2654 status = device_create_file(dev, &dev_attr_max_microamps);
2659 /* suspend mode constraints need multiple supporting methods */
2660 if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2663 status = device_create_file(dev, &dev_attr_suspend_standby_state);
2666 status = device_create_file(dev, &dev_attr_suspend_mem_state);
2669 status = device_create_file(dev, &dev_attr_suspend_disk_state);
2673 if (ops->set_suspend_voltage) {
2674 status = device_create_file(dev,
2675 &dev_attr_suspend_standby_microvolts);
2678 status = device_create_file(dev,
2679 &dev_attr_suspend_mem_microvolts);
2682 status = device_create_file(dev,
2683 &dev_attr_suspend_disk_microvolts);
2688 if (ops->set_suspend_mode) {
2689 status = device_create_file(dev,
2690 &dev_attr_suspend_standby_mode);
2693 status = device_create_file(dev,
2694 &dev_attr_suspend_mem_mode);
2697 status = device_create_file(dev,
2698 &dev_attr_suspend_disk_mode);
2706 static void rdev_init_debugfs(struct regulator_dev *rdev)
2708 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
2709 if (!rdev->debugfs) {
2710 rdev_warn(rdev, "Failed to create debugfs directory\n");
2714 debugfs_create_u32("use_count", 0444, rdev->debugfs,
2716 debugfs_create_u32("open_count", 0444, rdev->debugfs,
2721 * regulator_register - register regulator
2722 * @regulator_desc: regulator to register
2723 * @dev: struct device for the regulator
2724 * @init_data: platform provided init data, passed through by driver
2725 * @driver_data: private regulator data
2727 * Called by regulator drivers to register a regulator.
2728 * Returns 0 on success.
2730 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2731 struct device *dev, const struct regulator_init_data *init_data,
2732 void *driver_data, struct device_node *of_node)
2734 const struct regulation_constraints *constraints = NULL;
2735 static atomic_t regulator_no = ATOMIC_INIT(0);
2736 struct regulator_dev *rdev;
2738 const char *supply = NULL;
2740 if (regulator_desc == NULL)
2741 return ERR_PTR(-EINVAL);
2743 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2744 return ERR_PTR(-EINVAL);
2746 if (regulator_desc->type != REGULATOR_VOLTAGE &&
2747 regulator_desc->type != REGULATOR_CURRENT)
2748 return ERR_PTR(-EINVAL);
2750 /* Only one of each should be implemented */
2751 WARN_ON(regulator_desc->ops->get_voltage &&
2752 regulator_desc->ops->get_voltage_sel);
2753 WARN_ON(regulator_desc->ops->set_voltage &&
2754 regulator_desc->ops->set_voltage_sel);
2756 /* If we're using selectors we must implement list_voltage. */
2757 if (regulator_desc->ops->get_voltage_sel &&
2758 !regulator_desc->ops->list_voltage) {
2759 return ERR_PTR(-EINVAL);
2761 if (regulator_desc->ops->set_voltage_sel &&
2762 !regulator_desc->ops->list_voltage) {
2763 return ERR_PTR(-EINVAL);
2766 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2768 return ERR_PTR(-ENOMEM);
2770 mutex_lock(®ulator_list_mutex);
2772 mutex_init(&rdev->mutex);
2773 rdev->reg_data = driver_data;
2774 rdev->owner = regulator_desc->owner;
2775 rdev->desc = regulator_desc;
2776 INIT_LIST_HEAD(&rdev->consumer_list);
2777 INIT_LIST_HEAD(&rdev->list);
2778 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2779 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
2781 /* preform any regulator specific init */
2782 if (init_data && init_data->regulator_init) {
2783 ret = init_data->regulator_init(rdev->reg_data);
2788 /* register with sysfs */
2789 rdev->dev.class = ®ulator_class;
2790 rdev->dev.of_node = of_node;
2791 rdev->dev.parent = dev;
2792 dev_set_name(&rdev->dev, "regulator.%d",
2793 atomic_inc_return(®ulator_no) - 1);
2794 ret = device_register(&rdev->dev);
2796 put_device(&rdev->dev);
2800 dev_set_drvdata(&rdev->dev, rdev);
2802 /* set regulator constraints */
2804 constraints = &init_data->constraints;
2806 ret = set_machine_constraints(rdev, constraints);
2810 /* add attributes supported by this regulator */
2811 ret = add_regulator_attributes(rdev);
2815 if (init_data && init_data->supply_regulator)
2816 supply = init_data->supply_regulator;
2817 else if (regulator_desc->supply_name)
2818 supply = regulator_desc->supply_name;
2821 struct regulator_dev *r;
2823 r = regulator_dev_lookup(dev, supply);
2826 dev_err(dev, "Failed to find supply %s\n", supply);
2831 ret = set_supply(rdev, r);
2835 /* Enable supply if rail is enabled */
2836 if (rdev->desc->ops->is_enabled &&
2837 rdev->desc->ops->is_enabled(rdev)) {
2838 ret = regulator_enable(rdev->supply);
2844 /* add consumers devices */
2846 for (i = 0; i < init_data->num_consumer_supplies; i++) {
2847 ret = set_consumer_device_supply(rdev,
2848 init_data->consumer_supplies[i].dev,
2849 init_data->consumer_supplies[i].dev_name,
2850 init_data->consumer_supplies[i].supply);
2852 dev_err(dev, "Failed to set supply %s\n",
2853 init_data->consumer_supplies[i].supply);
2854 goto unset_supplies;
2859 list_add(&rdev->list, ®ulator_list);
2861 rdev_init_debugfs(rdev);
2863 mutex_unlock(®ulator_list_mutex);
2867 unset_regulator_supplies(rdev);
2870 kfree(rdev->constraints);
2871 device_unregister(&rdev->dev);
2872 /* device core frees rdev */
2873 rdev = ERR_PTR(ret);
2878 rdev = ERR_PTR(ret);
2881 EXPORT_SYMBOL_GPL(regulator_register);
2884 * regulator_unregister - unregister regulator
2885 * @rdev: regulator to unregister
2887 * Called by regulator drivers to unregister a regulator.
2889 void regulator_unregister(struct regulator_dev *rdev)
2894 mutex_lock(®ulator_list_mutex);
2895 debugfs_remove_recursive(rdev->debugfs);
2896 flush_work_sync(&rdev->disable_work.work);
2897 WARN_ON(rdev->open_count);
2898 unset_regulator_supplies(rdev);
2899 list_del(&rdev->list);
2901 regulator_put(rdev->supply);
2902 kfree(rdev->constraints);
2903 device_unregister(&rdev->dev);
2904 mutex_unlock(®ulator_list_mutex);
2906 EXPORT_SYMBOL_GPL(regulator_unregister);
2909 * regulator_suspend_prepare - prepare regulators for system wide suspend
2910 * @state: system suspend state
2912 * Configure each regulator with it's suspend operating parameters for state.
2913 * This will usually be called by machine suspend code prior to supending.
2915 int regulator_suspend_prepare(suspend_state_t state)
2917 struct regulator_dev *rdev;
2920 /* ON is handled by regulator active state */
2921 if (state == PM_SUSPEND_ON)
2924 mutex_lock(®ulator_list_mutex);
2925 list_for_each_entry(rdev, ®ulator_list, list) {
2927 mutex_lock(&rdev->mutex);
2928 ret = suspend_prepare(rdev, state);
2929 mutex_unlock(&rdev->mutex);
2932 rdev_err(rdev, "failed to prepare\n");
2937 mutex_unlock(®ulator_list_mutex);
2940 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2943 * regulator_suspend_finish - resume regulators from system wide suspend
2945 * Turn on regulators that might be turned off by regulator_suspend_prepare
2946 * and that should be turned on according to the regulators properties.
2948 int regulator_suspend_finish(void)
2950 struct regulator_dev *rdev;
2953 mutex_lock(®ulator_list_mutex);
2954 list_for_each_entry(rdev, ®ulator_list, list) {
2955 struct regulator_ops *ops = rdev->desc->ops;
2957 mutex_lock(&rdev->mutex);
2958 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
2960 error = ops->enable(rdev);
2964 if (!has_full_constraints)
2968 if (ops->is_enabled && !ops->is_enabled(rdev))
2971 error = ops->disable(rdev);
2976 mutex_unlock(&rdev->mutex);
2978 mutex_unlock(®ulator_list_mutex);
2981 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
2984 * regulator_has_full_constraints - the system has fully specified constraints
2986 * Calling this function will cause the regulator API to disable all
2987 * regulators which have a zero use count and don't have an always_on
2988 * constraint in a late_initcall.
2990 * The intention is that this will become the default behaviour in a
2991 * future kernel release so users are encouraged to use this facility
2994 void regulator_has_full_constraints(void)
2996 has_full_constraints = 1;
2998 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3001 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3003 * Calling this function will cause the regulator API to provide a
3004 * dummy regulator to consumers if no physical regulator is found,
3005 * allowing most consumers to proceed as though a regulator were
3006 * configured. This allows systems such as those with software
3007 * controllable regulators for the CPU core only to be brought up more
3010 void regulator_use_dummy_regulator(void)
3012 board_wants_dummy_regulator = true;
3014 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3017 * rdev_get_drvdata - get rdev regulator driver data
3020 * Get rdev regulator driver private data. This call can be used in the
3021 * regulator driver context.
3023 void *rdev_get_drvdata(struct regulator_dev *rdev)
3025 return rdev->reg_data;
3027 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3030 * regulator_get_drvdata - get regulator driver data
3031 * @regulator: regulator
3033 * Get regulator driver private data. This call can be used in the consumer
3034 * driver context when non API regulator specific functions need to be called.
3036 void *regulator_get_drvdata(struct regulator *regulator)
3038 return regulator->rdev->reg_data;
3040 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3043 * regulator_set_drvdata - set regulator driver data
3044 * @regulator: regulator
3047 void regulator_set_drvdata(struct regulator *regulator, void *data)
3049 regulator->rdev->reg_data = data;
3051 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3054 * regulator_get_id - get regulator ID
3057 int rdev_get_id(struct regulator_dev *rdev)
3059 return rdev->desc->id;
3061 EXPORT_SYMBOL_GPL(rdev_get_id);
3063 struct device *rdev_get_dev(struct regulator_dev *rdev)
3067 EXPORT_SYMBOL_GPL(rdev_get_dev);
3069 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3071 return reg_init_data->driver_data;
3073 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3075 #ifdef CONFIG_DEBUG_FS
3076 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3077 size_t count, loff_t *ppos)
3079 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3080 ssize_t len, ret = 0;
3081 struct regulator_map *map;
3086 list_for_each_entry(map, ®ulator_map_list, list) {
3087 len = snprintf(buf + ret, PAGE_SIZE - ret,
3089 rdev_get_name(map->regulator), map->dev_name,
3093 if (ret > PAGE_SIZE) {
3099 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3107 static const struct file_operations supply_map_fops = {
3108 #ifdef CONFIG_DEBUG_FS
3109 .read = supply_map_read_file,
3110 .llseek = default_llseek,
3114 static int __init regulator_init(void)
3118 ret = class_register(®ulator_class);
3120 debugfs_root = debugfs_create_dir("regulator", NULL);
3122 pr_warn("regulator: Failed to create debugfs directory\n");
3124 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3127 regulator_dummy_init();
3132 /* init early to allow our consumers to complete system booting */
3133 core_initcall(regulator_init);
3135 static int __init regulator_init_complete(void)
3137 struct regulator_dev *rdev;
3138 struct regulator_ops *ops;
3139 struct regulation_constraints *c;
3142 mutex_lock(®ulator_list_mutex);
3144 /* If we have a full configuration then disable any regulators
3145 * which are not in use or always_on. This will become the
3146 * default behaviour in the future.
3148 list_for_each_entry(rdev, ®ulator_list, list) {
3149 ops = rdev->desc->ops;
3150 c = rdev->constraints;
3152 if (!ops->disable || (c && c->always_on))
3155 mutex_lock(&rdev->mutex);
3157 if (rdev->use_count)
3160 /* If we can't read the status assume it's on. */
3161 if (ops->is_enabled)
3162 enabled = ops->is_enabled(rdev);
3169 if (has_full_constraints) {
3170 /* We log since this may kill the system if it
3172 rdev_info(rdev, "disabling\n");
3173 ret = ops->disable(rdev);
3175 rdev_err(rdev, "couldn't disable: %d\n", ret);
3178 /* The intention is that in future we will
3179 * assume that full constraints are provided
3180 * so warn even if we aren't going to do
3183 rdev_warn(rdev, "incomplete constraints, leaving on\n");
3187 mutex_unlock(&rdev->mutex);
3190 mutex_unlock(®ulator_list_mutex);
3194 late_initcall(regulator_init_complete);