[linux-2.6-block.git] / drivers / power / power_supply_core.c

/*
 *  Universal power supply monitor class
 *
 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
 *
 *  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/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 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);

	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;

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

	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_register(struct device *parent, struct power_supply *psy)
{
	int rc = 0;

	psy->dev = device_create(power_supply_class, parent, 0, psy,
				 "%s", psy->name);
	if (IS_ERR(psy->dev)) {
		rc = PTR_ERR(psy->dev);
		goto dev_create_failed;
	}

	INIT_WORK(&psy->changed_work, power_supply_changed_work);

	rc = power_supply_create_attrs(psy);
	if (rc)
		goto create_attrs_failed;

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

	power_supply_changed(psy);

	goto success;

create_triggers_failed:
	power_supply_remove_attrs(psy);
create_attrs_failed:
	device_unregister(psy->dev);
dev_create_failed:
success:
	return rc;
}
EXPORT_SYMBOL_GPL(power_supply_register);

void power_supply_unregister(struct power_supply *psy)
{
	flush_scheduled_work();
	power_supply_remove_triggers(psy);
	power_supply_remove_attrs(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;

	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 <spyro@f2s.com>, "
	      "Szabolcs Gyurko, "
	      "Anton Vorontsov <cbou@mail.ru>");
MODULE_LICENSE("GPL");
Commit	Line	Data
4a11b59d AV	1	/*
	2	* Universal power supply monitor class
	3	*
	4	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	5	* Copyright © 2004 Szabolcs Gyurko
	6	* Copyright © 2003 Ian Molton <spyro@f2s.com>
	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>
	16	#include <linux/device.h>
	17	#include <linux/err.h>
	18	#include <linux/power_supply.h>
	19	#include "power_supply.h"
	20
ff3417e7	21	/* exported for the APM Power driver, APM emulation */
4a11b59d	22	struct class *power_supply_class;
ff3417e7	23	EXPORT_SYMBOL_GPL(power_supply_class);
4a11b59d	24
443cad92 DY	25	static int __power_supply_changed_work(struct device dev, void data)
	26	{
	27	struct power_supply psy = (struct power_supply )data;
	28	struct power_supply *pst = dev_get_drvdata(dev);
	29	int i;
	30
	31	for (i = 0; i < psy->num_supplicants; i++)
	32	if (!strcmp(psy->supplied_to[i], pst->name)) {
	33	if (pst->external_power_changed)
	34	pst->external_power_changed(pst);
	35	}
	36	return 0;
	37	}
	38
4a11b59d AV	39	static void power_supply_changed_work(struct work_struct *work)
	40	{
	41	struct power_supply *psy = container_of(work, struct power_supply,
	42	changed_work);
4a11b59d	43
0cddc0a9	44	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d	45
93562b53	46	class_for_each_device(power_supply_class, NULL, psy,
443cad92	47	__power_supply_changed_work);
4a11b59d AV	48
	49	power_supply_update_leds(psy);
	50
	51	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
4a11b59d AV	52	}
	53
	54	void power_supply_changed(struct power_supply *psy)
	55	{
0cddc0a9	56	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d AV	57
4a11b59d AV	58	schedule_work(&psy->changed_work);
4a11b59d	59	}
ff3417e7	60	EXPORT_SYMBOL_GPL(power_supply_changed);
4a11b59d	61
443cad92	62	static int __power_supply_am_i_supplied(struct device dev, void data)
4a11b59d AV	63	{
4a11b59d AV	64	union power_supply_propval ret = {0,};
443cad92 DY	65	struct power_supply psy = (struct power_supply )data;
	66	struct power_supply *epsy = dev_get_drvdata(dev);
	67	int i;
	68
	69	for (i = 0; i < epsy->num_supplicants; i++) {
	70	if (!strcmp(epsy->supplied_to[i], psy->name)) {
	71	if (epsy->get_property(epsy,
	72	POWER_SUPPLY_PROP_ONLINE, &ret))
	73	continue;
	74	if (ret.intval)
	75	return ret.intval;
4a11b59d AV	76	}
4a11b59d AV	77	}
443cad92 DY	78	return 0;
	79	}
	80
	81	int power_supply_am_i_supplied(struct power_supply *psy)
	82	{
	83	int error;
	84
93562b53	85	error = class_for_each_device(power_supply_class, NULL, psy,
443cad92	86	__power_supply_am_i_supplied);
4a11b59d	87
0cddc0a9	88	dev_dbg(psy->dev, "%s %d\n", __func__, error);
4a11b59d	89
443cad92	90	return error;
4a11b59d	91	}
ff3417e7	92	EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
4a11b59d	93
942ed161 MG	94	static int __power_supply_is_system_supplied(struct device dev, void data)
	95	{
	96	union power_supply_propval ret = {0,};
	97	struct power_supply *psy = dev_get_drvdata(dev);
	98
	99	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
	100	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
	101	return 0;
	102	if (ret.intval)
	103	return ret.intval;
	104	}
	105	return 0;
	106	}
	107
	108	int power_supply_is_system_supplied(void)
	109	{
	110	int error;
	111
	112	error = class_for_each_device(power_supply_class, NULL, NULL,
	113	__power_supply_is_system_supplied);
	114
	115	return error;
	116	}
ff3417e7	117	EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
942ed161	118
e5f5ccb6 DM	119	int power_supply_set_battery_charged(struct power_supply *psy)
	120	{
	121	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
	122	psy->set_charged(psy);
	123	return 0;
	124	}
	125
	126	return -EINVAL;
	127	}
	128	EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
	129
	130	static int power_supply_match_device_by_name(struct device dev, void data)
	131	{
	132	const char *name = data;
	133	struct power_supply *psy = dev_get_drvdata(dev);
	134
	135	return strcmp(psy->name, name) == 0;
	136	}
	137
	138	struct power_supply power_supply_get_by_name(char name)
	139	{
	140	struct device *dev = class_find_device(power_supply_class, NULL, name,
	141	power_supply_match_device_by_name);
	142
	143	return dev ? dev_get_drvdata(dev) : NULL;
	144	}
	145	EXPORT_SYMBOL_GPL(power_supply_get_by_name);
	146
4a11b59d AV	147	int power_supply_register(struct device parent, struct power_supply psy)
	148	{
	149	int rc = 0;
	150
a9b12619 GKH	151	psy->dev = device_create(power_supply_class, parent, 0, psy,
a9b12619 GKH	152	"%s", psy->name);
4a11b59d AV	153	if (IS_ERR(psy->dev)) {
	154	rc = PTR_ERR(psy->dev);
	155	goto dev_create_failed;
	156	}
	157
4a11b59d AV	158	INIT_WORK(&psy->changed_work, power_supply_changed_work);
	159
	160	rc = power_supply_create_attrs(psy);
	161	if (rc)
	162	goto create_attrs_failed;
	163
	164	rc = power_supply_create_triggers(psy);
	165	if (rc)
	166	goto create_triggers_failed;
	167
	168	power_supply_changed(psy);
	169
	170	goto success;
	171
	172	create_triggers_failed:
	173	power_supply_remove_attrs(psy);
	174	create_attrs_failed:
	175	device_unregister(psy->dev);
	176	dev_create_failed:
	177	success:
	178	return rc;
	179	}
ff3417e7	180	EXPORT_SYMBOL_GPL(power_supply_register);
4a11b59d AV	181
	182	void power_supply_unregister(struct power_supply *psy)
	183	{
	184	flush_scheduled_work();
	185	power_supply_remove_triggers(psy);
	186	power_supply_remove_attrs(psy);
	187	device_unregister(psy->dev);
4a11b59d	188	}
ff3417e7	189	EXPORT_SYMBOL_GPL(power_supply_unregister);
4a11b59d AV	190
	191	static int __init power_supply_class_init(void)
	192	{
	193	power_supply_class = class_create(THIS_MODULE, "power_supply");
	194
	195	if (IS_ERR(power_supply_class))
	196	return PTR_ERR(power_supply_class);
	197
	198	power_supply_class->dev_uevent = power_supply_uevent;
	199
	200	return 0;
	201	}
	202
	203	static void __exit power_supply_class_exit(void)
	204	{
	205	class_destroy(power_supply_class);
4a11b59d AV	206	}
4a11b59d AV	207
4a11b59d AV	208	subsys_initcall(power_supply_class_init);
	209	module_exit(power_supply_class_exit);
	210
	211	MODULE_DESCRIPTION("Universal power supply monitor class");
	212	MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	213	"Szabolcs Gyurko, "
	214	"Anton Vorontsov <cbou@mail.ru>");
	215	MODULE_LICENSE("GPL");