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/device.h>
19 #include <linux/err.h>
20 #include <linux/mutex.h>
21 #include <linux/suspend.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
26 #define REGULATOR_VERSION "0.5"
28 static DEFINE_MUTEX(regulator_list_mutex);
29 static LIST_HEAD(regulator_list);
30 static LIST_HEAD(regulator_map_list);
33 * struct regulator_dev
35 * Voltage / Current regulator class device. One for each regulator.
37 struct regulator_dev {
38 struct regulator_desc *desc;
41 /* lists we belong to */
42 struct list_head list; /* list of all regulators */
43 struct list_head slist; /* list of supplied regulators */
46 struct list_head consumer_list; /* consumers we supply */
47 struct list_head supply_list; /* regulators we supply */
49 struct blocking_notifier_head notifier;
50 struct mutex mutex; /* consumer lock */
53 struct regulation_constraints *constraints;
54 struct regulator_dev *supply; /* for tree */
56 void *reg_data; /* regulator_dev data */
60 * struct regulator_map
62 * Used to provide symbolic supply names to devices.
64 struct regulator_map {
65 struct list_head list;
68 struct regulator_dev *regulator;
74 * One for each consumer device.
78 struct list_head list;
82 int enabled; /* client has called enabled */
84 struct device_attribute dev_attr;
85 struct regulator_dev *rdev;
88 static int _regulator_is_enabled(struct regulator_dev *rdev);
89 static int _regulator_disable(struct regulator_dev *rdev);
90 static int _regulator_get_voltage(struct regulator_dev *rdev);
91 static int _regulator_get_current_limit(struct regulator_dev *rdev);
92 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
93 static void _notifier_call_chain(struct regulator_dev *rdev,
94 unsigned long event, void *data);
96 /* gets the regulator for a given consumer device */
97 static struct regulator *get_device_regulator(struct device *dev)
99 struct regulator *regulator = NULL;
100 struct regulator_dev *rdev;
102 mutex_lock(®ulator_list_mutex);
103 list_for_each_entry(rdev, ®ulator_list, list) {
104 mutex_lock(&rdev->mutex);
105 list_for_each_entry(regulator, &rdev->consumer_list, list) {
106 if (regulator->dev == dev) {
107 mutex_unlock(&rdev->mutex);
108 mutex_unlock(®ulator_list_mutex);
112 mutex_unlock(&rdev->mutex);
114 mutex_unlock(®ulator_list_mutex);
118 /* Platform voltage constraint check */
119 static int regulator_check_voltage(struct regulator_dev *rdev,
120 int *min_uV, int *max_uV)
122 BUG_ON(*min_uV > *max_uV);
124 if (!rdev->constraints) {
125 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
129 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
130 printk(KERN_ERR "%s: operation not allowed for %s\n",
131 __func__, rdev->desc->name);
135 if (*max_uV > rdev->constraints->max_uV)
136 *max_uV = rdev->constraints->max_uV;
137 if (*min_uV < rdev->constraints->min_uV)
138 *min_uV = rdev->constraints->min_uV;
140 if (*min_uV > *max_uV)
146 /* current constraint check */
147 static int regulator_check_current_limit(struct regulator_dev *rdev,
148 int *min_uA, int *max_uA)
150 BUG_ON(*min_uA > *max_uA);
152 if (!rdev->constraints) {
153 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
157 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
158 printk(KERN_ERR "%s: operation not allowed for %s\n",
159 __func__, rdev->desc->name);
163 if (*max_uA > rdev->constraints->max_uA)
164 *max_uA = rdev->constraints->max_uA;
165 if (*min_uA < rdev->constraints->min_uA)
166 *min_uA = rdev->constraints->min_uA;
168 if (*min_uA > *max_uA)
174 /* operating mode constraint check */
175 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
177 if (!rdev->constraints) {
178 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
182 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
183 printk(KERN_ERR "%s: operation not allowed for %s\n",
184 __func__, rdev->desc->name);
187 if (!(rdev->constraints->valid_modes_mask & mode)) {
188 printk(KERN_ERR "%s: invalid mode %x for %s\n",
189 __func__, mode, rdev->desc->name);
195 /* dynamic regulator mode switching constraint check */
196 static int regulator_check_drms(struct regulator_dev *rdev)
198 if (!rdev->constraints) {
199 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
203 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
204 printk(KERN_ERR "%s: operation not allowed for %s\n",
205 __func__, rdev->desc->name);
211 static ssize_t device_requested_uA_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
214 struct regulator *regulator;
216 regulator = get_device_regulator(dev);
217 if (regulator == NULL)
220 return sprintf(buf, "%d\n", regulator->uA_load);
223 static ssize_t regulator_uV_show(struct device *dev,
224 struct device_attribute *attr, char *buf)
226 struct regulator_dev *rdev = dev_get_drvdata(dev);
229 mutex_lock(&rdev->mutex);
230 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
231 mutex_unlock(&rdev->mutex);
236 static ssize_t regulator_uA_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
239 struct regulator_dev *rdev = dev_get_drvdata(dev);
241 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
244 static ssize_t regulator_opmode_show(struct device *dev,
245 struct device_attribute *attr, char *buf)
247 struct regulator_dev *rdev = dev_get_drvdata(dev);
248 int mode = _regulator_get_mode(rdev);
251 case REGULATOR_MODE_FAST:
252 return sprintf(buf, "fast\n");
253 case REGULATOR_MODE_NORMAL:
254 return sprintf(buf, "normal\n");
255 case REGULATOR_MODE_IDLE:
256 return sprintf(buf, "idle\n");
257 case REGULATOR_MODE_STANDBY:
258 return sprintf(buf, "standby\n");
260 return sprintf(buf, "unknown\n");
263 static ssize_t regulator_state_show(struct device *dev,
264 struct device_attribute *attr, char *buf)
266 struct regulator_dev *rdev = dev_get_drvdata(dev);
267 int state = _regulator_is_enabled(rdev);
270 return sprintf(buf, "enabled\n");
272 return sprintf(buf, "disabled\n");
274 return sprintf(buf, "unknown\n");
277 static ssize_t regulator_min_uA_show(struct device *dev,
278 struct device_attribute *attr, char *buf)
280 struct regulator_dev *rdev = dev_get_drvdata(dev);
282 if (!rdev->constraints)
283 return sprintf(buf, "constraint not defined\n");
285 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
288 static ssize_t regulator_max_uA_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
291 struct regulator_dev *rdev = dev_get_drvdata(dev);
293 if (!rdev->constraints)
294 return sprintf(buf, "constraint not defined\n");
296 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
299 static ssize_t regulator_min_uV_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
302 struct regulator_dev *rdev = dev_get_drvdata(dev);
304 if (!rdev->constraints)
305 return sprintf(buf, "constraint not defined\n");
307 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
310 static ssize_t regulator_max_uV_show(struct device *dev,
311 struct device_attribute *attr, char *buf)
313 struct regulator_dev *rdev = dev_get_drvdata(dev);
315 if (!rdev->constraints)
316 return sprintf(buf, "constraint not defined\n");
318 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
321 static ssize_t regulator_total_uA_show(struct device *dev,
322 struct device_attribute *attr, char *buf)
324 struct regulator_dev *rdev = dev_get_drvdata(dev);
325 struct regulator *regulator;
328 mutex_lock(&rdev->mutex);
329 list_for_each_entry(regulator, &rdev->consumer_list, list)
330 uA += regulator->uA_load;
331 mutex_unlock(&rdev->mutex);
332 return sprintf(buf, "%d\n", uA);
335 static ssize_t regulator_num_users_show(struct device *dev,
336 struct device_attribute *attr, char *buf)
338 struct regulator_dev *rdev = dev_get_drvdata(dev);
339 return sprintf(buf, "%d\n", rdev->use_count);
342 static ssize_t regulator_type_show(struct device *dev,
343 struct device_attribute *attr, char *buf)
345 struct regulator_dev *rdev = dev_get_drvdata(dev);
347 switch (rdev->desc->type) {
348 case REGULATOR_VOLTAGE:
349 return sprintf(buf, "voltage\n");
350 case REGULATOR_CURRENT:
351 return sprintf(buf, "current\n");
353 return sprintf(buf, "unknown\n");
356 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
357 struct device_attribute *attr, char *buf)
359 struct regulator_dev *rdev = dev_get_drvdata(dev);
361 if (!rdev->constraints)
362 return sprintf(buf, "not defined\n");
363 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
366 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
367 struct device_attribute *attr, char *buf)
369 struct regulator_dev *rdev = dev_get_drvdata(dev);
371 if (!rdev->constraints)
372 return sprintf(buf, "not defined\n");
373 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
376 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
379 struct regulator_dev *rdev = dev_get_drvdata(dev);
381 if (!rdev->constraints)
382 return sprintf(buf, "not defined\n");
383 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
386 static ssize_t suspend_opmode_show(struct regulator_dev *rdev,
387 unsigned int mode, char *buf)
390 case REGULATOR_MODE_FAST:
391 return sprintf(buf, "fast\n");
392 case REGULATOR_MODE_NORMAL:
393 return sprintf(buf, "normal\n");
394 case REGULATOR_MODE_IDLE:
395 return sprintf(buf, "idle\n");
396 case REGULATOR_MODE_STANDBY:
397 return sprintf(buf, "standby\n");
399 return sprintf(buf, "unknown\n");
402 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
403 struct device_attribute *attr, char *buf)
405 struct regulator_dev *rdev = dev_get_drvdata(dev);
407 if (!rdev->constraints)
408 return sprintf(buf, "not defined\n");
409 return suspend_opmode_show(rdev,
410 rdev->constraints->state_mem.mode, buf);
413 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
416 struct regulator_dev *rdev = dev_get_drvdata(dev);
418 if (!rdev->constraints)
419 return sprintf(buf, "not defined\n");
420 return suspend_opmode_show(rdev,
421 rdev->constraints->state_disk.mode, buf);
424 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
427 struct regulator_dev *rdev = dev_get_drvdata(dev);
429 if (!rdev->constraints)
430 return sprintf(buf, "not defined\n");
431 return suspend_opmode_show(rdev,
432 rdev->constraints->state_standby.mode, buf);
435 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
436 struct device_attribute *attr, char *buf)
438 struct regulator_dev *rdev = dev_get_drvdata(dev);
440 if (!rdev->constraints)
441 return sprintf(buf, "not defined\n");
443 if (rdev->constraints->state_mem.enabled)
444 return sprintf(buf, "enabled\n");
446 return sprintf(buf, "disabled\n");
449 static ssize_t regulator_suspend_disk_state_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, "not defined\n");
457 if (rdev->constraints->state_disk.enabled)
458 return sprintf(buf, "enabled\n");
460 return sprintf(buf, "disabled\n");
463 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
464 struct device_attribute *attr, char *buf)
466 struct regulator_dev *rdev = dev_get_drvdata(dev);
468 if (!rdev->constraints)
469 return sprintf(buf, "not defined\n");
471 if (rdev->constraints->state_standby.enabled)
472 return sprintf(buf, "enabled\n");
474 return sprintf(buf, "disabled\n");
476 static struct device_attribute regulator_dev_attrs[] = {
477 __ATTR(microvolts, 0444, regulator_uV_show, NULL),
478 __ATTR(microamps, 0444, regulator_uA_show, NULL),
479 __ATTR(opmode, 0444, regulator_opmode_show, NULL),
480 __ATTR(state, 0444, regulator_state_show, NULL),
481 __ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL),
482 __ATTR(min_microamps, 0444, regulator_min_uA_show, NULL),
483 __ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL),
484 __ATTR(max_microamps, 0444, regulator_max_uA_show, NULL),
485 __ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL),
486 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
487 __ATTR(type, 0444, regulator_type_show, NULL),
488 __ATTR(suspend_mem_microvolts, 0444,
489 regulator_suspend_mem_uV_show, NULL),
490 __ATTR(suspend_disk_microvolts, 0444,
491 regulator_suspend_disk_uV_show, NULL),
492 __ATTR(suspend_standby_microvolts, 0444,
493 regulator_suspend_standby_uV_show, NULL),
494 __ATTR(suspend_mem_mode, 0444,
495 regulator_suspend_mem_mode_show, NULL),
496 __ATTR(suspend_disk_mode, 0444,
497 regulator_suspend_disk_mode_show, NULL),
498 __ATTR(suspend_standby_mode, 0444,
499 regulator_suspend_standby_mode_show, NULL),
500 __ATTR(suspend_mem_state, 0444,
501 regulator_suspend_mem_state_show, NULL),
502 __ATTR(suspend_disk_state, 0444,
503 regulator_suspend_disk_state_show, NULL),
504 __ATTR(suspend_standby_state, 0444,
505 regulator_suspend_standby_state_show, NULL),
509 static void regulator_dev_release(struct device *dev)
511 struct regulator_dev *rdev = dev_get_drvdata(dev);
515 static struct class regulator_class = {
517 .dev_release = regulator_dev_release,
518 .dev_attrs = regulator_dev_attrs,
521 /* Calculate the new optimum regulator operating mode based on the new total
522 * consumer load. All locks held by caller */
523 static void drms_uA_update(struct regulator_dev *rdev)
525 struct regulator *sibling;
526 int current_uA = 0, output_uV, input_uV, err;
529 err = regulator_check_drms(rdev);
530 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
531 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
534 /* get output voltage */
535 output_uV = rdev->desc->ops->get_voltage(rdev);
539 /* get input voltage */
540 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
541 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
543 input_uV = rdev->constraints->input_uV;
547 /* calc total requested load */
548 list_for_each_entry(sibling, &rdev->consumer_list, list)
549 current_uA += sibling->uA_load;
551 /* now get the optimum mode for our new total regulator load */
552 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
553 output_uV, current_uA);
555 /* check the new mode is allowed */
556 err = regulator_check_mode(rdev, mode);
558 rdev->desc->ops->set_mode(rdev, mode);
561 static int suspend_set_state(struct regulator_dev *rdev,
562 struct regulator_state *rstate)
566 /* enable & disable are mandatory for suspend control */
567 if (!rdev->desc->ops->set_suspend_enable ||
568 !rdev->desc->ops->set_suspend_disable) {
569 printk(KERN_ERR "%s: no way to set suspend state\n",
575 ret = rdev->desc->ops->set_suspend_enable(rdev);
577 ret = rdev->desc->ops->set_suspend_disable(rdev);
579 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
583 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
584 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
586 printk(KERN_ERR "%s: failed to set voltage\n",
592 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
593 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
595 printk(KERN_ERR "%s: failed to set mode\n", __func__);
602 /* locks held by caller */
603 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
605 if (!rdev->constraints)
609 case PM_SUSPEND_STANDBY:
610 return suspend_set_state(rdev,
611 &rdev->constraints->state_standby);
613 return suspend_set_state(rdev,
614 &rdev->constraints->state_mem);
616 return suspend_set_state(rdev,
617 &rdev->constraints->state_disk);
623 static void print_constraints(struct regulator_dev *rdev)
625 struct regulation_constraints *constraints = rdev->constraints;
629 if (rdev->desc->type == REGULATOR_VOLTAGE) {
630 if (constraints->min_uV == constraints->max_uV)
631 count = sprintf(buf, "%d mV ",
632 constraints->min_uV / 1000);
634 count = sprintf(buf, "%d <--> %d mV ",
635 constraints->min_uV / 1000,
636 constraints->max_uV / 1000);
638 if (constraints->min_uA == constraints->max_uA)
639 count = sprintf(buf, "%d mA ",
640 constraints->min_uA / 1000);
642 count = sprintf(buf, "%d <--> %d mA ",
643 constraints->min_uA / 1000,
644 constraints->max_uA / 1000);
646 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
647 count += sprintf(buf + count, "fast ");
648 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
649 count += sprintf(buf + count, "normal ");
650 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
651 count += sprintf(buf + count, "idle ");
652 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
653 count += sprintf(buf + count, "standby");
655 printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
659 * set_machine_constraints - sets regulator constraints
660 * @regulator: regulator source
662 * Allows platform initialisation code to define and constrain
663 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
664 * Constraints *must* be set by platform code in order for some
665 * regulator operations to proceed i.e. set_voltage, set_current_limit,
668 static int set_machine_constraints(struct regulator_dev *rdev,
669 struct regulation_constraints *constraints)
673 struct regulator_ops *ops = rdev->desc->ops;
675 if (constraints->name)
676 name = constraints->name;
677 else if (rdev->desc->name)
678 name = rdev->desc->name;
682 rdev->constraints = constraints;
684 /* do we need to apply the constraint voltage */
685 if (rdev->constraints->apply_uV &&
686 rdev->constraints->min_uV == rdev->constraints->max_uV &&
688 ret = ops->set_voltage(rdev,
689 rdev->constraints->min_uV, rdev->constraints->max_uV);
691 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
693 rdev->constraints->min_uV, name);
694 rdev->constraints = NULL;
699 /* are we enabled at boot time by firmware / bootloader */
700 if (rdev->constraints->boot_on)
703 /* do we need to setup our suspend state */
704 if (constraints->initial_state) {
705 ret = suspend_prepare(rdev, constraints->initial_state);
707 printk(KERN_ERR "%s: failed to set suspend state for %s\n",
709 rdev->constraints = NULL;
714 /* if always_on is set then turn the regulator on if it's not
716 if (constraints->always_on && ops->enable &&
717 ((ops->is_enabled && !ops->is_enabled(rdev)) ||
718 (!ops->is_enabled && !constraints->boot_on))) {
719 ret = ops->enable(rdev);
721 printk(KERN_ERR "%s: failed to enable %s\n",
723 rdev->constraints = NULL;
728 print_constraints(rdev);
734 * set_supply - set regulator supply regulator
735 * @regulator: regulator name
736 * @supply: supply regulator name
738 * Called by platform initialisation code to set the supply regulator for this
739 * regulator. This ensures that a regulators supply will also be enabled by the
740 * core if it's child is enabled.
742 static int set_supply(struct regulator_dev *rdev,
743 struct regulator_dev *supply_rdev)
747 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
751 "%s: could not add device link %s err %d\n",
752 __func__, supply_rdev->dev.kobj.name, err);
755 rdev->supply = supply_rdev;
756 list_add(&rdev->slist, &supply_rdev->supply_list);
762 * set_consumer_device_supply: Bind a regulator to a symbolic supply
763 * @regulator: regulator source
764 * @dev: device the supply applies to
765 * @supply: symbolic name for supply
767 * Allows platform initialisation code to map physical regulator
768 * sources to symbolic names for supplies for use by devices. Devices
769 * should use these symbolic names to request regulators, avoiding the
770 * need to provide board-specific regulator names as platform data.
772 static int set_consumer_device_supply(struct regulator_dev *rdev,
773 struct device *consumer_dev, const char *supply)
775 struct regulator_map *node;
780 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
784 node->regulator = rdev;
785 node->dev = consumer_dev;
786 node->supply = supply;
788 list_add(&node->list, ®ulator_map_list);
792 static void unset_consumer_device_supply(struct regulator_dev *rdev,
793 struct device *consumer_dev)
795 struct regulator_map *node, *n;
797 list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
798 if (rdev == node->regulator &&
799 consumer_dev == node->dev) {
800 list_del(&node->list);
807 #define REG_STR_SIZE 32
809 static struct regulator *create_regulator(struct regulator_dev *rdev,
811 const char *supply_name)
813 struct regulator *regulator;
814 char buf[REG_STR_SIZE];
817 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
818 if (regulator == NULL)
821 mutex_lock(&rdev->mutex);
822 regulator->rdev = rdev;
823 list_add(®ulator->list, &rdev->consumer_list);
826 /* create a 'requested_microamps_name' sysfs entry */
827 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
829 if (size >= REG_STR_SIZE)
832 regulator->dev = dev;
833 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
834 if (regulator->dev_attr.attr.name == NULL)
837 regulator->dev_attr.attr.owner = THIS_MODULE;
838 regulator->dev_attr.attr.mode = 0444;
839 regulator->dev_attr.show = device_requested_uA_show;
840 err = device_create_file(dev, ®ulator->dev_attr);
842 printk(KERN_WARNING "%s: could not add regulator_dev"
843 " load sysfs\n", __func__);
847 /* also add a link to the device sysfs entry */
848 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
849 dev->kobj.name, supply_name);
850 if (size >= REG_STR_SIZE)
853 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
854 if (regulator->supply_name == NULL)
857 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
861 "%s: could not add device link %s err %d\n",
862 __func__, dev->kobj.name, err);
863 device_remove_file(dev, ®ulator->dev_attr);
867 mutex_unlock(&rdev->mutex);
870 kfree(regulator->supply_name);
872 device_remove_file(regulator->dev, ®ulator->dev_attr);
874 kfree(regulator->dev_attr.attr.name);
876 list_del(®ulator->list);
878 mutex_unlock(&rdev->mutex);
883 * regulator_get - lookup and obtain a reference to a regulator.
884 * @dev: device for regulator "consumer"
885 * @id: Supply name or regulator ID.
887 * Returns a struct regulator corresponding to the regulator producer,
888 * or IS_ERR() condition containing errno. Use of supply names
889 * configured via regulator_set_device_supply() is strongly
892 struct regulator *regulator_get(struct device *dev, const char *id)
894 struct regulator_dev *rdev;
895 struct regulator_map *map;
896 struct regulator *regulator = ERR_PTR(-ENODEV);
899 printk(KERN_ERR "regulator: get() with no identifier\n");
903 mutex_lock(®ulator_list_mutex);
905 list_for_each_entry(map, ®ulator_map_list, list) {
906 if (dev == map->dev &&
907 strcmp(map->supply, id) == 0) {
908 rdev = map->regulator;
912 printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
914 mutex_unlock(®ulator_list_mutex);
918 if (!try_module_get(rdev->owner))
921 regulator = create_regulator(rdev, dev, id);
922 if (regulator == NULL) {
923 regulator = ERR_PTR(-ENOMEM);
924 module_put(rdev->owner);
928 mutex_unlock(®ulator_list_mutex);
931 EXPORT_SYMBOL_GPL(regulator_get);
934 * regulator_put - "free" the regulator source
935 * @regulator: regulator source
937 * Note: drivers must ensure that all regulator_enable calls made on this
938 * regulator source are balanced by regulator_disable calls prior to calling
941 void regulator_put(struct regulator *regulator)
943 struct regulator_dev *rdev;
945 if (regulator == NULL || IS_ERR(regulator))
948 if (regulator->enabled) {
949 printk(KERN_WARNING "Releasing supply %s while enabled\n",
950 regulator->supply_name);
951 WARN_ON(regulator->enabled);
952 regulator_disable(regulator);
955 mutex_lock(®ulator_list_mutex);
956 rdev = regulator->rdev;
958 /* remove any sysfs entries */
959 if (regulator->dev) {
960 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
961 kfree(regulator->supply_name);
962 device_remove_file(regulator->dev, ®ulator->dev_attr);
963 kfree(regulator->dev_attr.attr.name);
965 list_del(®ulator->list);
968 module_put(rdev->owner);
969 mutex_unlock(®ulator_list_mutex);
971 EXPORT_SYMBOL_GPL(regulator_put);
973 /* locks held by regulator_enable() */
974 static int _regulator_enable(struct regulator_dev *rdev)
978 if (!rdev->constraints) {
979 printk(KERN_ERR "%s: %s has no constraints\n",
980 __func__, rdev->desc->name);
984 /* do we need to enable the supply regulator first */
986 ret = _regulator_enable(rdev->supply);
988 printk(KERN_ERR "%s: failed to enable %s: %d\n",
989 __func__, rdev->desc->name, ret);
994 /* check voltage and requested load before enabling */
995 if (rdev->desc->ops->enable) {
997 if (rdev->constraints &&
998 (rdev->constraints->valid_ops_mask &
999 REGULATOR_CHANGE_DRMS))
1000 drms_uA_update(rdev);
1002 ret = rdev->desc->ops->enable(rdev);
1004 printk(KERN_ERR "%s: failed to enable %s: %d\n",
1005 __func__, rdev->desc->name, ret);
1016 * regulator_enable - enable regulator output
1017 * @regulator: regulator source
1019 * Enable the regulator output at the predefined voltage or current value.
1020 * NOTE: the output value can be set by other drivers, boot loader or may be
1021 * hardwired in the regulator.
1022 * NOTE: calls to regulator_enable() must be balanced with calls to
1023 * regulator_disable().
1025 int regulator_enable(struct regulator *regulator)
1029 if (regulator->enabled) {
1030 printk(KERN_CRIT "Regulator %s already enabled\n",
1031 regulator->supply_name);
1032 WARN_ON(regulator->enabled);
1036 mutex_lock(®ulator->rdev->mutex);
1037 regulator->enabled = 1;
1038 ret = _regulator_enable(regulator->rdev);
1040 regulator->enabled = 0;
1041 mutex_unlock(®ulator->rdev->mutex);
1044 EXPORT_SYMBOL_GPL(regulator_enable);
1046 /* locks held by regulator_disable() */
1047 static int _regulator_disable(struct regulator_dev *rdev)
1051 /* are we the last user and permitted to disable ? */
1052 if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1054 /* we are last user */
1055 if (rdev->desc->ops->disable) {
1056 ret = rdev->desc->ops->disable(rdev);
1058 printk(KERN_ERR "%s: failed to disable %s\n",
1059 __func__, rdev->desc->name);
1064 /* decrease our supplies ref count and disable if required */
1066 _regulator_disable(rdev->supply);
1068 rdev->use_count = 0;
1069 } else if (rdev->use_count > 1) {
1071 if (rdev->constraints &&
1072 (rdev->constraints->valid_ops_mask &
1073 REGULATOR_CHANGE_DRMS))
1074 drms_uA_update(rdev);
1082 * regulator_disable - disable regulator output
1083 * @regulator: regulator source
1085 * Disable the regulator output voltage or current.
1086 * NOTE: this will only disable the regulator output if no other consumer
1087 * devices have it enabled.
1088 * NOTE: calls to regulator_enable() must be balanced with calls to
1089 * regulator_disable().
1091 int regulator_disable(struct regulator *regulator)
1095 if (!regulator->enabled) {
1096 printk(KERN_ERR "%s: not in use by this consumer\n",
1101 mutex_lock(®ulator->rdev->mutex);
1102 regulator->enabled = 0;
1103 regulator->uA_load = 0;
1104 ret = _regulator_disable(regulator->rdev);
1105 mutex_unlock(®ulator->rdev->mutex);
1108 EXPORT_SYMBOL_GPL(regulator_disable);
1110 /* locks held by regulator_force_disable() */
1111 static int _regulator_force_disable(struct regulator_dev *rdev)
1116 if (rdev->desc->ops->disable) {
1117 /* ah well, who wants to live forever... */
1118 ret = rdev->desc->ops->disable(rdev);
1120 printk(KERN_ERR "%s: failed to force disable %s\n",
1121 __func__, rdev->desc->name);
1124 /* notify other consumers that power has been forced off */
1125 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1129 /* decrease our supplies ref count and disable if required */
1131 _regulator_disable(rdev->supply);
1133 rdev->use_count = 0;
1138 * regulator_force_disable - force disable regulator output
1139 * @regulator: regulator source
1141 * Forcibly disable the regulator output voltage or current.
1142 * NOTE: this *will* disable the regulator output even if other consumer
1143 * devices have it enabled. This should be used for situations when device
1144 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1146 int regulator_force_disable(struct regulator *regulator)
1150 mutex_lock(®ulator->rdev->mutex);
1151 regulator->enabled = 0;
1152 regulator->uA_load = 0;
1153 ret = _regulator_force_disable(regulator->rdev);
1154 mutex_unlock(®ulator->rdev->mutex);
1157 EXPORT_SYMBOL_GPL(regulator_force_disable);
1159 static int _regulator_is_enabled(struct regulator_dev *rdev)
1163 mutex_lock(&rdev->mutex);
1166 if (!rdev->desc->ops->is_enabled) {
1171 ret = rdev->desc->ops->is_enabled(rdev);
1173 mutex_unlock(&rdev->mutex);
1178 * regulator_is_enabled - is the regulator output enabled
1179 * @regulator: regulator source
1181 * Returns zero for disabled otherwise return number of enable requests.
1183 int regulator_is_enabled(struct regulator *regulator)
1185 return _regulator_is_enabled(regulator->rdev);
1187 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1190 * regulator_set_voltage - set regulator output voltage
1191 * @regulator: regulator source
1192 * @min_uV: Minimum required voltage in uV
1193 * @max_uV: Maximum acceptable voltage in uV
1195 * Sets a voltage regulator to the desired output voltage. This can be set
1196 * during any regulator state. IOW, regulator can be disabled or enabled.
1198 * If the regulator is enabled then the voltage will change to the new value
1199 * immediately otherwise if the regulator is disabled the regulator will
1200 * output at the new voltage when enabled.
1202 * NOTE: If the regulator is shared between several devices then the lowest
1203 * request voltage that meets the system constraints will be used.
1204 * NOTE: Regulator system constraints must be set for this regulator before
1205 * calling this function otherwise this call will fail.
1207 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1209 struct regulator_dev *rdev = regulator->rdev;
1212 mutex_lock(&rdev->mutex);
1215 if (!rdev->desc->ops->set_voltage) {
1220 /* constraints check */
1221 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1224 regulator->min_uV = min_uV;
1225 regulator->max_uV = max_uV;
1226 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1229 mutex_unlock(&rdev->mutex);
1232 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1234 static int _regulator_get_voltage(struct regulator_dev *rdev)
1237 if (rdev->desc->ops->get_voltage)
1238 return rdev->desc->ops->get_voltage(rdev);
1244 * regulator_get_voltage - get regulator output voltage
1245 * @regulator: regulator source
1247 * This returns the current regulator voltage in uV.
1249 * NOTE: If the regulator is disabled it will return the voltage value. This
1250 * function should not be used to determine regulator state.
1252 int regulator_get_voltage(struct regulator *regulator)
1256 mutex_lock(®ulator->rdev->mutex);
1258 ret = _regulator_get_voltage(regulator->rdev);
1260 mutex_unlock(®ulator->rdev->mutex);
1264 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1267 * regulator_set_current_limit - set regulator output current limit
1268 * @regulator: regulator source
1269 * @min_uA: Minimuum supported current in uA
1270 * @max_uA: Maximum supported current in uA
1272 * Sets current sink to the desired output current. This can be set during
1273 * any regulator state. IOW, regulator can be disabled or enabled.
1275 * If the regulator is enabled then the current will change to the new value
1276 * immediately otherwise if the regulator is disabled the regulator will
1277 * output at the new current when enabled.
1279 * NOTE: Regulator system constraints must be set for this regulator before
1280 * calling this function otherwise this call will fail.
1282 int regulator_set_current_limit(struct regulator *regulator,
1283 int min_uA, int max_uA)
1285 struct regulator_dev *rdev = regulator->rdev;
1288 mutex_lock(&rdev->mutex);
1291 if (!rdev->desc->ops->set_current_limit) {
1296 /* constraints check */
1297 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1301 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1303 mutex_unlock(&rdev->mutex);
1306 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1308 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1312 mutex_lock(&rdev->mutex);
1315 if (!rdev->desc->ops->get_current_limit) {
1320 ret = rdev->desc->ops->get_current_limit(rdev);
1322 mutex_unlock(&rdev->mutex);
1327 * regulator_get_current_limit - get regulator output current
1328 * @regulator: regulator source
1330 * This returns the current supplied by the specified current sink in uA.
1332 * NOTE: If the regulator is disabled it will return the current value. This
1333 * function should not be used to determine regulator state.
1335 int regulator_get_current_limit(struct regulator *regulator)
1337 return _regulator_get_current_limit(regulator->rdev);
1339 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1342 * regulator_set_mode - set regulator operating mode
1343 * @regulator: regulator source
1344 * @mode: operating mode - one of the REGULATOR_MODE constants
1346 * Set regulator operating mode to increase regulator efficiency or improve
1347 * regulation performance.
1349 * NOTE: Regulator system constraints must be set for this regulator before
1350 * calling this function otherwise this call will fail.
1352 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1354 struct regulator_dev *rdev = regulator->rdev;
1357 mutex_lock(&rdev->mutex);
1360 if (!rdev->desc->ops->set_mode) {
1365 /* constraints check */
1366 ret = regulator_check_mode(rdev, mode);
1370 ret = rdev->desc->ops->set_mode(rdev, mode);
1372 mutex_unlock(&rdev->mutex);
1375 EXPORT_SYMBOL_GPL(regulator_set_mode);
1377 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1381 mutex_lock(&rdev->mutex);
1384 if (!rdev->desc->ops->get_mode) {
1389 ret = rdev->desc->ops->get_mode(rdev);
1391 mutex_unlock(&rdev->mutex);
1396 * regulator_get_mode - get regulator operating mode
1397 * @regulator: regulator source
1399 * Get the current regulator operating mode.
1401 unsigned int regulator_get_mode(struct regulator *regulator)
1403 return _regulator_get_mode(regulator->rdev);
1405 EXPORT_SYMBOL_GPL(regulator_get_mode);
1408 * regulator_set_optimum_mode - set regulator optimum operating mode
1409 * @regulator: regulator source
1410 * @uA_load: load current
1412 * Notifies the regulator core of a new device load. This is then used by
1413 * DRMS (if enabled by constraints) to set the most efficient regulator
1414 * operating mode for the new regulator loading.
1416 * Consumer devices notify their supply regulator of the maximum power
1417 * they will require (can be taken from device datasheet in the power
1418 * consumption tables) when they change operational status and hence power
1419 * state. Examples of operational state changes that can affect power
1420 * consumption are :-
1422 * o Device is opened / closed.
1423 * o Device I/O is about to begin or has just finished.
1424 * o Device is idling in between work.
1426 * This information is also exported via sysfs to userspace.
1428 * DRMS will sum the total requested load on the regulator and change
1429 * to the most efficient operating mode if platform constraints allow.
1431 * Returns the new regulator mode or error.
1433 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1435 struct regulator_dev *rdev = regulator->rdev;
1436 struct regulator *consumer;
1437 int ret, output_uV, input_uV, total_uA_load = 0;
1440 mutex_lock(&rdev->mutex);
1442 regulator->uA_load = uA_load;
1443 ret = regulator_check_drms(rdev);
1449 if (!rdev->desc->ops->get_optimum_mode)
1452 /* get output voltage */
1453 output_uV = rdev->desc->ops->get_voltage(rdev);
1454 if (output_uV <= 0) {
1455 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1456 __func__, rdev->desc->name);
1460 /* get input voltage */
1461 if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1462 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1464 input_uV = rdev->constraints->input_uV;
1465 if (input_uV <= 0) {
1466 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1467 __func__, rdev->desc->name);
1471 /* calc total requested load for this regulator */
1472 list_for_each_entry(consumer, &rdev->consumer_list, list)
1473 total_uA_load += consumer->uA_load;
1475 mode = rdev->desc->ops->get_optimum_mode(rdev,
1476 input_uV, output_uV,
1479 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1480 " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1481 total_uA_load, input_uV, output_uV);
1485 ret = rdev->desc->ops->set_mode(rdev, mode);
1487 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1488 __func__, mode, rdev->desc->name);
1493 mutex_unlock(&rdev->mutex);
1496 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1499 * regulator_register_notifier - register regulator event notifier
1500 * @regulator: regulator source
1501 * @notifier_block: notifier block
1503 * Register notifier block to receive regulator events.
1505 int regulator_register_notifier(struct regulator *regulator,
1506 struct notifier_block *nb)
1508 return blocking_notifier_chain_register(®ulator->rdev->notifier,
1511 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1514 * regulator_unregister_notifier - unregister regulator event notifier
1515 * @regulator: regulator source
1516 * @notifier_block: notifier block
1518 * Unregister regulator event notifier block.
1520 int regulator_unregister_notifier(struct regulator *regulator,
1521 struct notifier_block *nb)
1523 return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
1526 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1528 /* notify regulator consumers and downstream regulator consumers */
1529 static void _notifier_call_chain(struct regulator_dev *rdev,
1530 unsigned long event, void *data)
1532 struct regulator_dev *_rdev;
1534 /* call rdev chain first */
1535 mutex_lock(&rdev->mutex);
1536 blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1537 mutex_unlock(&rdev->mutex);
1539 /* now notify regulator we supply */
1540 list_for_each_entry(_rdev, &rdev->supply_list, slist)
1541 _notifier_call_chain(_rdev, event, data);
1545 * regulator_bulk_get - get multiple regulator consumers
1547 * @dev: Device to supply
1548 * @num_consumers: Number of consumers to register
1549 * @consumers: Configuration of consumers; clients are stored here.
1551 * @return 0 on success, an errno on failure.
1553 * This helper function allows drivers to get several regulator
1554 * consumers in one operation. If any of the regulators cannot be
1555 * acquired then any regulators that were allocated will be freed
1556 * before returning to the caller.
1558 int regulator_bulk_get(struct device *dev, int num_consumers,
1559 struct regulator_bulk_data *consumers)
1564 for (i = 0; i < num_consumers; i++)
1565 consumers[i].consumer = NULL;
1567 for (i = 0; i < num_consumers; i++) {
1568 consumers[i].consumer = regulator_get(dev,
1569 consumers[i].supply);
1570 if (IS_ERR(consumers[i].consumer)) {
1571 dev_err(dev, "Failed to get supply '%s'\n",
1572 consumers[i].supply);
1573 ret = PTR_ERR(consumers[i].consumer);
1574 consumers[i].consumer = NULL;
1582 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1583 regulator_put(consumers[i].consumer);
1587 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1590 * regulator_bulk_enable - enable multiple regulator consumers
1592 * @num_consumers: Number of consumers
1593 * @consumers: Consumer data; clients are stored here.
1594 * @return 0 on success, an errno on failure
1596 * This convenience API allows consumers to enable multiple regulator
1597 * clients in a single API call. If any consumers cannot be enabled
1598 * then any others that were enabled will be disabled again prior to
1601 int regulator_bulk_enable(int num_consumers,
1602 struct regulator_bulk_data *consumers)
1607 for (i = 0; i < num_consumers; i++) {
1608 ret = regulator_enable(consumers[i].consumer);
1616 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1617 for (i = 0; i < num_consumers; i++)
1618 regulator_disable(consumers[i].consumer);
1622 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1625 * regulator_bulk_disable - disable multiple regulator consumers
1627 * @num_consumers: Number of consumers
1628 * @consumers: Consumer data; clients are stored here.
1629 * @return 0 on success, an errno on failure
1631 * This convenience API allows consumers to disable multiple regulator
1632 * clients in a single API call. If any consumers cannot be enabled
1633 * then any others that were disabled will be disabled again prior to
1636 int regulator_bulk_disable(int num_consumers,
1637 struct regulator_bulk_data *consumers)
1642 for (i = 0; i < num_consumers; i++) {
1643 ret = regulator_disable(consumers[i].consumer);
1651 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1652 for (i = 0; i < num_consumers; i++)
1653 regulator_enable(consumers[i].consumer);
1657 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1660 * regulator_bulk_free - free multiple regulator consumers
1662 * @num_consumers: Number of consumers
1663 * @consumers: Consumer data; clients are stored here.
1665 * This convenience API allows consumers to free multiple regulator
1666 * clients in a single API call.
1668 void regulator_bulk_free(int num_consumers,
1669 struct regulator_bulk_data *consumers)
1673 for (i = 0; i < num_consumers; i++) {
1674 regulator_put(consumers[i].consumer);
1675 consumers[i].consumer = NULL;
1678 EXPORT_SYMBOL_GPL(regulator_bulk_free);
1681 * regulator_notifier_call_chain - call regulator event notifier
1682 * @regulator: regulator source
1683 * @event: notifier block
1686 * Called by regulator drivers to notify clients a regulator event has
1687 * occurred. We also notify regulator clients downstream.
1689 int regulator_notifier_call_chain(struct regulator_dev *rdev,
1690 unsigned long event, void *data)
1692 _notifier_call_chain(rdev, event, data);
1696 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1699 * regulator_register - register regulator
1700 * @regulator: regulator source
1701 * @reg_data: private regulator data
1703 * Called by regulator drivers to register a regulator.
1704 * Returns 0 on success.
1706 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
1707 struct device *dev, void *driver_data)
1709 static atomic_t regulator_no = ATOMIC_INIT(0);
1710 struct regulator_dev *rdev;
1711 struct regulator_init_data *init_data = dev->platform_data;
1714 if (regulator_desc == NULL)
1715 return ERR_PTR(-EINVAL);
1717 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
1718 return ERR_PTR(-EINVAL);
1720 if (!regulator_desc->type == REGULATOR_VOLTAGE &&
1721 !regulator_desc->type == REGULATOR_CURRENT)
1722 return ERR_PTR(-EINVAL);
1725 return ERR_PTR(-EINVAL);
1727 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
1729 return ERR_PTR(-ENOMEM);
1731 mutex_lock(®ulator_list_mutex);
1733 mutex_init(&rdev->mutex);
1734 rdev->reg_data = driver_data;
1735 rdev->owner = regulator_desc->owner;
1736 rdev->desc = regulator_desc;
1737 INIT_LIST_HEAD(&rdev->consumer_list);
1738 INIT_LIST_HEAD(&rdev->supply_list);
1739 INIT_LIST_HEAD(&rdev->list);
1740 INIT_LIST_HEAD(&rdev->slist);
1741 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
1743 /* preform any regulator specific init */
1744 if (init_data->regulator_init) {
1745 ret = init_data->regulator_init(rdev->reg_data);
1748 rdev = ERR_PTR(ret);
1753 /* set regulator constraints */
1754 ret = set_machine_constraints(rdev, &init_data->constraints);
1757 rdev = ERR_PTR(ret);
1761 /* register with sysfs */
1762 rdev->dev.class = ®ulator_class;
1763 rdev->dev.parent = dev;
1764 snprintf(rdev->dev.bus_id, sizeof(rdev->dev.bus_id),
1765 "regulator.%d", atomic_inc_return(®ulator_no) - 1);
1766 ret = device_register(&rdev->dev);
1769 rdev = ERR_PTR(ret);
1773 dev_set_drvdata(&rdev->dev, rdev);
1775 /* set supply regulator if it exists */
1776 if (init_data->supply_regulator_dev) {
1777 ret = set_supply(rdev,
1778 dev_get_drvdata(init_data->supply_regulator_dev));
1780 device_unregister(&rdev->dev);
1782 rdev = ERR_PTR(ret);
1787 /* add consumers devices */
1788 for (i = 0; i < init_data->num_consumer_supplies; i++) {
1789 ret = set_consumer_device_supply(rdev,
1790 init_data->consumer_supplies[i].dev,
1791 init_data->consumer_supplies[i].supply);
1793 for (--i; i >= 0; i--)
1794 unset_consumer_device_supply(rdev,
1795 init_data->consumer_supplies[i].dev);
1796 device_unregister(&rdev->dev);
1798 rdev = ERR_PTR(ret);
1803 list_add(&rdev->list, ®ulator_list);
1805 mutex_unlock(®ulator_list_mutex);
1808 EXPORT_SYMBOL_GPL(regulator_register);
1811 * regulator_unregister - unregister regulator
1812 * @regulator: regulator source
1814 * Called by regulator drivers to unregister a regulator.
1816 void regulator_unregister(struct regulator_dev *rdev)
1821 mutex_lock(®ulator_list_mutex);
1822 list_del(&rdev->list);
1824 sysfs_remove_link(&rdev->dev.kobj, "supply");
1825 device_unregister(&rdev->dev);
1826 mutex_unlock(®ulator_list_mutex);
1828 EXPORT_SYMBOL_GPL(regulator_unregister);
1831 * regulator_suspend_prepare: prepare regulators for system wide suspend
1832 * @state: system suspend state
1834 * Configure each regulator with it's suspend operating parameters for state.
1835 * This will usually be called by machine suspend code prior to supending.
1837 int regulator_suspend_prepare(suspend_state_t state)
1839 struct regulator_dev *rdev;
1842 /* ON is handled by regulator active state */
1843 if (state == PM_SUSPEND_ON)
1846 mutex_lock(®ulator_list_mutex);
1847 list_for_each_entry(rdev, ®ulator_list, list) {
1849 mutex_lock(&rdev->mutex);
1850 ret = suspend_prepare(rdev, state);
1851 mutex_unlock(&rdev->mutex);
1854 printk(KERN_ERR "%s: failed to prepare %s\n",
1855 __func__, rdev->desc->name);
1860 mutex_unlock(®ulator_list_mutex);
1863 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
1866 * rdev_get_drvdata - get rdev regulator driver data
1867 * @regulator: regulator
1869 * Get rdev regulator driver private data. This call can be used in the
1870 * regulator driver context.
1872 void *rdev_get_drvdata(struct regulator_dev *rdev)
1874 return rdev->reg_data;
1876 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
1879 * regulator_get_drvdata - get regulator driver data
1880 * @regulator: regulator
1882 * Get regulator driver private data. This call can be used in the consumer
1883 * driver context when non API regulator specific functions need to be called.
1885 void *regulator_get_drvdata(struct regulator *regulator)
1887 return regulator->rdev->reg_data;
1889 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
1892 * regulator_set_drvdata - set regulator driver data
1893 * @regulator: regulator
1896 void regulator_set_drvdata(struct regulator *regulator, void *data)
1898 regulator->rdev->reg_data = data;
1900 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
1903 * regulator_get_id - get regulator ID
1904 * @regulator: regulator
1906 int rdev_get_id(struct regulator_dev *rdev)
1908 return rdev->desc->id;
1910 EXPORT_SYMBOL_GPL(rdev_get_id);
1912 struct device *rdev_get_dev(struct regulator_dev *rdev)
1916 EXPORT_SYMBOL_GPL(rdev_get_dev);
1918 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
1920 return reg_init_data->driver_data;
1922 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
1924 static int __init regulator_init(void)
1926 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
1927 return class_register(®ulator_class);
1930 /* init early to allow our consumers to complete system booting */
1931 core_initcall(regulator_init);