[linux.git] / drivers / power / power_supply_core.c

/*
 *  Universal power supply monitor class
 *
 *  Copyright © 2007  Anton Vorontsov <[email protected]>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <[email protected]>
 *
 *  Modified: 2004, Oct     Szabolcs Gyurko
 *
 *  You may use this code as per GPL version 2
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include "power_supply.h"

/* exported for the APM Power driver, APM emulation */
struct class *power_supply_class;
EXPORT_SYMBOL_GPL(power_supply_class);

static struct device_type power_supply_dev_type;

static int __power_supply_changed_work(struct device *dev, void *data)
{
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *pst = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < psy->num_supplicants; i++)
		if (!strcmp(psy->supplied_to[i], pst->name)) {
			if (pst->external_power_changed)
				pst->external_power_changed(pst);
		}
	return 0;
}

static void power_supply_changed_work(struct work_struct *work)
{
	struct power_supply *psy = container_of(work, struct power_supply,
						changed_work);

	dev_dbg(psy->dev, "%s\n", __func__);

	class_for_each_device(power_supply_class, NULL, psy,
			      __power_supply_changed_work);

	power_supply_update_leds(psy);

	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
}

void power_supply_changed(struct power_supply *psy)
{
	dev_dbg(psy->dev, "%s\n", __func__);

	schedule_work(&psy->changed_work);
}
EXPORT_SYMBOL_GPL(power_supply_changed);

static int __power_supply_am_i_supplied(struct device *dev, void *data)
{
	union power_supply_propval ret = {0,};
	struct power_supply *psy = (struct power_supply *)data;
	struct power_supply *epsy = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < epsy->num_supplicants; i++) {
		if (!strcmp(epsy->supplied_to[i], psy->name)) {
			if (epsy->get_property(epsy,
				  POWER_SUPPLY_PROP_ONLINE, &ret))
				continue;
			if (ret.intval)
				return ret.intval;
		}
	}
	return 0;
}

int power_supply_am_i_supplied(struct power_supply *psy)
{
	int error;

	error = class_for_each_device(power_supply_class, NULL, psy,
				      __power_supply_am_i_supplied);

	dev_dbg(psy->dev, "%s %d\n", __func__, error);

	return error;
}
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);

static int __power_supply_is_system_supplied(struct device *dev, void *data)
{
	union power_supply_propval ret = {0,};
	struct power_supply *psy = dev_get_drvdata(dev);
	unsigned int *count = data;

	(*count)++;
	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
		if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
			return 0;
		if (ret.intval)
			return ret.intval;
	}
	return 0;
}

int power_supply_is_system_supplied(void)
{
	int error;
	unsigned int count = 0;

	error = class_for_each_device(power_supply_class, NULL, &count,
				      __power_supply_is_system_supplied);

	/*
	 * If no power class device was found at all, most probably we are
	 * running on a desktop system, so assume we are on mains power.
	 */
	if (count == 0)
		return 1;

	return error;
}
EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);

int power_supply_set_battery_charged(struct power_supply *psy)
{
	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
		psy->set_charged(psy);
		return 0;
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);

static int power_supply_match_device_by_name(struct device *dev, void *data)
{
	const char *name = data;
	struct power_supply *psy = dev_get_drvdata(dev);

	return strcmp(psy->name, name) == 0;
}

struct power_supply *power_supply_get_by_name(char *name)
{
	struct device *dev = class_find_device(power_supply_class, NULL, name,
					power_supply_match_device_by_name);

	return dev ? dev_get_drvdata(dev) : NULL;
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);

int power_supply_powers(struct power_supply *psy, struct device *dev)
{
	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
}
EXPORT_SYMBOL_GPL(power_supply_powers);

static void power_supply_dev_release(struct device *dev)
{
	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	kfree(dev);
}

int power_supply_register(struct device *parent, struct power_supply *psy)
{
	struct device *dev;
	int rc;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	device_initialize(dev);

	dev->class = power_supply_class;
	dev->type = &power_supply_dev_type;
	dev->parent = parent;
	dev->release = power_supply_dev_release;
	dev_set_drvdata(dev, psy);
	psy->dev = dev;

	INIT_WORK(&psy->changed_work, power_supply_changed_work);

	rc = kobject_set_name(&dev->kobj, "%s", psy->name);
	if (rc)
		goto kobject_set_name_failed;

	rc = device_add(dev);
	if (rc)
		goto device_add_failed;

	rc = power_supply_create_triggers(psy);
	if (rc)
		goto create_triggers_failed;

	power_supply_changed(psy);

	goto success;

create_triggers_failed:
	device_del(dev);
kobject_set_name_failed:
device_add_failed:
	put_device(dev);
success:
	return rc;
}
EXPORT_SYMBOL_GPL(power_supply_register);

void power_supply_unregister(struct power_supply *psy)
{
	cancel_work_sync(&psy->changed_work);
	sysfs_remove_link(&psy->dev->kobj, "powers");
	power_supply_remove_triggers(psy);
	device_unregister(psy->dev);
}
EXPORT_SYMBOL_GPL(power_supply_unregister);

static int __init power_supply_class_init(void)
{
	power_supply_class = class_create(THIS_MODULE, "power_supply");

	if (IS_ERR(power_supply_class))
		return PTR_ERR(power_supply_class);

	power_supply_class->dev_uevent = power_supply_uevent;
	power_supply_init_attrs(&power_supply_dev_type);

	return 0;
}

static void __exit power_supply_class_exit(void)
{
	class_destroy(power_supply_class);
}

subsys_initcall(power_supply_class_init);
module_exit(power_supply_class_exit);

MODULE_DESCRIPTION("Universal power supply monitor class");
MODULE_AUTHOR("Ian Molton <[email protected]>, "
	      "Szabolcs Gyurko, "
	      "Anton Vorontsov <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
4a11b59d AV	1	/*
	2	* Universal power supply monitor class
	3	*
	4	* Copyright © 2007 Anton Vorontsov <[email protected]>
	5	* Copyright © 2004 Szabolcs Gyurko
	6	* Copyright © 2003 Ian Molton <[email protected]>
	7	*
	8	* Modified: 2004, Oct Szabolcs Gyurko
	9	*
	10	* You may use this code as per GPL version 2
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/types.h>
	15	#include <linux/init.h>
5f487cd3	16	#include <linux/slab.h>
4a11b59d AV	17	#include <linux/device.h>
	18	#include <linux/err.h>
	19	#include <linux/power_supply.h>
	20	#include "power_supply.h"
	21
ff3417e7	22	/* exported for the APM Power driver, APM emulation */
4a11b59d	23	struct class *power_supply_class;
ff3417e7	24	EXPORT_SYMBOL_GPL(power_supply_class);
4a11b59d	25
5f487cd3 AV	26	static struct device_type power_supply_dev_type;
5f487cd3 AV	27
443cad92 DY	28	static int __power_supply_changed_work(struct device dev, void data)
	29	{
	30	struct power_supply psy = (struct power_supply )data;
	31	struct power_supply *pst = dev_get_drvdata(dev);
	32	int i;
	33
	34	for (i = 0; i < psy->num_supplicants; i++)
	35	if (!strcmp(psy->supplied_to[i], pst->name)) {
	36	if (pst->external_power_changed)
	37	pst->external_power_changed(pst);
	38	}
	39	return 0;
	40	}
	41
4a11b59d AV	42	static void power_supply_changed_work(struct work_struct *work)
	43	{
	44	struct power_supply *psy = container_of(work, struct power_supply,
	45	changed_work);
4a11b59d	46
0cddc0a9	47	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d	48
93562b53	49	class_for_each_device(power_supply_class, NULL, psy,
443cad92	50	__power_supply_changed_work);
4a11b59d AV	51
	52	power_supply_update_leds(psy);
	53
	54	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
4a11b59d AV	55	}
	56
	57	void power_supply_changed(struct power_supply *psy)
	58	{
0cddc0a9	59	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d AV	60
4a11b59d AV	61	schedule_work(&psy->changed_work);
4a11b59d	62	}
ff3417e7	63	EXPORT_SYMBOL_GPL(power_supply_changed);
4a11b59d	64
443cad92	65	static int __power_supply_am_i_supplied(struct device dev, void data)
4a11b59d AV	66	{
4a11b59d AV	67	union power_supply_propval ret = {0,};
443cad92 DY	68	struct power_supply psy = (struct power_supply )data;
	69	struct power_supply *epsy = dev_get_drvdata(dev);
	70	int i;
	71
	72	for (i = 0; i < epsy->num_supplicants; i++) {
	73	if (!strcmp(epsy->supplied_to[i], psy->name)) {
	74	if (epsy->get_property(epsy,
	75	POWER_SUPPLY_PROP_ONLINE, &ret))
	76	continue;
	77	if (ret.intval)
	78	return ret.intval;
4a11b59d AV	79	}
4a11b59d AV	80	}
443cad92 DY	81	return 0;
	82	}
	83
	84	int power_supply_am_i_supplied(struct power_supply *psy)
	85	{
	86	int error;
	87
93562b53	88	error = class_for_each_device(power_supply_class, NULL, psy,
443cad92	89	__power_supply_am_i_supplied);
4a11b59d	90
0cddc0a9	91	dev_dbg(psy->dev, "%s %d\n", __func__, error);
4a11b59d	92
443cad92	93	return error;
4a11b59d	94	}
ff3417e7	95	EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
4a11b59d	96
942ed161 MG	97	static int __power_supply_is_system_supplied(struct device dev, void data)
	98	{
	99	union power_supply_propval ret = {0,};
	100	struct power_supply *psy = dev_get_drvdata(dev);
2530daa1	101	unsigned int *count = data;
942ed161	102
2530daa1	103	(*count)++;
942ed161 MG	104	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
	105	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
	106	return 0;
	107	if (ret.intval)
	108	return ret.intval;
	109	}
	110	return 0;
	111	}
	112
	113	int power_supply_is_system_supplied(void)
	114	{
	115	int error;
2530daa1	116	unsigned int count = 0;
942ed161	117
2530daa1	118	error = class_for_each_device(power_supply_class, NULL, &count,
942ed161 MG	119	__power_supply_is_system_supplied);
942ed161 MG	120
2530daa1 JD	121	/*
	122	* If no power class device was found at all, most probably we are
	123	* running on a desktop system, so assume we are on mains power.
	124	*/
	125	if (count == 0)
	126	return 1;
	127
942ed161 MG	128	return error;
942ed161 MG	129	}
ff3417e7	130	EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
942ed161	131
e5f5ccb6 DM	132	int power_supply_set_battery_charged(struct power_supply *psy)
	133	{
	134	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
	135	psy->set_charged(psy);
	136	return 0;
	137	}
	138
	139	return -EINVAL;
	140	}
	141	EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
	142
	143	static int power_supply_match_device_by_name(struct device dev, void data)
	144	{
	145	const char *name = data;
	146	struct power_supply *psy = dev_get_drvdata(dev);
	147
	148	return strcmp(psy->name, name) == 0;
	149	}
	150
	151	struct power_supply power_supply_get_by_name(char name)
	152	{
	153	struct device *dev = class_find_device(power_supply_class, NULL, name,
	154	power_supply_match_device_by_name);
	155
	156	return dev ? dev_get_drvdata(dev) : NULL;
	157	}
	158	EXPORT_SYMBOL_GPL(power_supply_get_by_name);
	159
83516651 JF	160	int power_supply_powers(struct power_supply psy, struct device dev)
83516651 JF	161	{
93278d15	162	return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
83516651 JF	163	}
	164	EXPORT_SYMBOL_GPL(power_supply_powers);
	165
5f487cd3 AV	166	static void power_supply_dev_release(struct device *dev)
	167	{
	168	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	169	kfree(dev);
	170	}
	171
4a11b59d AV	172	int power_supply_register(struct device parent, struct power_supply psy)
4a11b59d AV	173	{
5f487cd3 AV	174	struct device *dev;
5f487cd3 AV	175	int rc;
4a11b59d	176
5f487cd3 AV	177	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	178	if (!dev)
	179	return -ENOMEM;
4a11b59d	180
5f487cd3	181	device_initialize(dev);
4a11b59d	182
5f487cd3 AV	183	dev->class = power_supply_class;
	184	dev->type = &power_supply_dev_type;
	185	dev->parent = parent;
	186	dev->release = power_supply_dev_release;
	187	dev_set_drvdata(dev, psy);
	188	psy->dev = dev;
	189
97774672 LPC	190	INIT_WORK(&psy->changed_work, power_supply_changed_work);
97774672 LPC	191
5f487cd3 AV	192	rc = kobject_set_name(&dev->kobj, "%s", psy->name);
	193	if (rc)
	194	goto kobject_set_name_failed;
	195
	196	rc = device_add(dev);
4a11b59d	197	if (rc)
5f487cd3 AV	198	goto device_add_failed;
5f487cd3 AV	199
4a11b59d AV	200	rc = power_supply_create_triggers(psy);
	201	if (rc)
	202	goto create_triggers_failed;
	203
	204	power_supply_changed(psy);
	205
	206	goto success;
	207
	208	create_triggers_failed:
3a2dbd61	209	device_del(dev);
5f487cd3 AV	210	kobject_set_name_failed:
5f487cd3 AV	211	device_add_failed:
3a2dbd61	212	put_device(dev);
4a11b59d AV	213	success:
	214	return rc;
	215	}
ff3417e7	216	EXPORT_SYMBOL_GPL(power_supply_register);
4a11b59d AV	217
	218	void power_supply_unregister(struct power_supply *psy)
	219	{
bc51e7ff	220	cancel_work_sync(&psy->changed_work);
83516651	221	sysfs_remove_link(&psy->dev->kobj, "powers");
4a11b59d	222	power_supply_remove_triggers(psy);
4a11b59d	223	device_unregister(psy->dev);
4a11b59d	224	}
ff3417e7	225	EXPORT_SYMBOL_GPL(power_supply_unregister);
4a11b59d AV	226
	227	static int __init power_supply_class_init(void)
	228	{
	229	power_supply_class = class_create(THIS_MODULE, "power_supply");
	230
	231	if (IS_ERR(power_supply_class))
	232	return PTR_ERR(power_supply_class);
	233
	234	power_supply_class->dev_uevent = power_supply_uevent;
5f487cd3	235	power_supply_init_attrs(&power_supply_dev_type);
4a11b59d AV	236
	237	return 0;
	238	}
	239
	240	static void __exit power_supply_class_exit(void)
	241	{
	242	class_destroy(power_supply_class);
4a11b59d AV	243	}
4a11b59d AV	244
4a11b59d AV	245	subsys_initcall(power_supply_class_init);
	246	module_exit(power_supply_class_exit);
	247
	248	MODULE_DESCRIPTION("Universal power supply monitor class");
	249	MODULE_AUTHOR("Ian Molton <[email protected]>, "
	250	"Szabolcs Gyurko, "
	251	"Anton Vorontsov <[email protected]>");
	252	MODULE_LICENSE("GPL");