[net-next-2.6.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/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);

	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);

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;

	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;

	INIT_WORK(&psy->changed_work, power_supply_changed_work);

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

	power_supply_changed(psy);

	goto success;

create_triggers_failed:
	device_unregister(psy->dev);
kobject_set_name_failed:
device_add_failed:
	kfree(dev);
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);
	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 <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>
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);
	101
	102	if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
	103	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
	104	return 0;
	105	if (ret.intval)
	106	return ret.intval;
	107	}
	108	return 0;
	109	}
	110
	111	int power_supply_is_system_supplied(void)
	112	{
	113	int error;
	114
	115	error = class_for_each_device(power_supply_class, NULL, NULL,
	116	__power_supply_is_system_supplied);
	117
	118	return error;
	119	}
ff3417e7	120	EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
942ed161	121
e5f5ccb6 DM	122	int power_supply_set_battery_charged(struct power_supply *psy)
	123	{
	124	if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
	125	psy->set_charged(psy);
	126	return 0;
	127	}
	128
	129	return -EINVAL;
	130	}
	131	EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
	132
	133	static int power_supply_match_device_by_name(struct device dev, void data)
	134	{
	135	const char *name = data;
	136	struct power_supply *psy = dev_get_drvdata(dev);
	137
	138	return strcmp(psy->name, name) == 0;
	139	}
	140
	141	struct power_supply power_supply_get_by_name(char name)
	142	{
	143	struct device *dev = class_find_device(power_supply_class, NULL, name,
	144	power_supply_match_device_by_name);
	145
	146	return dev ? dev_get_drvdata(dev) : NULL;
	147	}
	148	EXPORT_SYMBOL_GPL(power_supply_get_by_name);
	149
5f487cd3 AV	150	static void power_supply_dev_release(struct device *dev)
	151	{
	152	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
	153	kfree(dev);
	154	}
	155
4a11b59d AV	156	int power_supply_register(struct device parent, struct power_supply psy)
4a11b59d AV	157	{
5f487cd3 AV	158	struct device *dev;
5f487cd3 AV	159	int rc;
4a11b59d	160
5f487cd3 AV	161	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	162	if (!dev)
	163	return -ENOMEM;
4a11b59d	164
5f487cd3	165	device_initialize(dev);
4a11b59d	166
5f487cd3 AV	167	dev->class = power_supply_class;
	168	dev->type = &power_supply_dev_type;
	169	dev->parent = parent;
	170	dev->release = power_supply_dev_release;
	171	dev_set_drvdata(dev, psy);
	172	psy->dev = dev;
	173
	174	rc = kobject_set_name(&dev->kobj, "%s", psy->name);
	175	if (rc)
	176	goto kobject_set_name_failed;
	177
	178	rc = device_add(dev);
4a11b59d	179	if (rc)
5f487cd3 AV	180	goto device_add_failed;
	181
	182	INIT_WORK(&psy->changed_work, power_supply_changed_work);
4a11b59d AV	183
	184	rc = power_supply_create_triggers(psy);
	185	if (rc)
	186	goto create_triggers_failed;
	187
	188	power_supply_changed(psy);
	189
	190	goto success;
	191
	192	create_triggers_failed:
4a11b59d	193	device_unregister(psy->dev);
5f487cd3 AV	194	kobject_set_name_failed:
	195	device_add_failed:
	196	kfree(dev);
4a11b59d AV	197	success:
	198	return rc;
	199	}
ff3417e7	200	EXPORT_SYMBOL_GPL(power_supply_register);
4a11b59d AV	201
	202	void power_supply_unregister(struct power_supply *psy)
	203	{
	204	flush_scheduled_work();
	205	power_supply_remove_triggers(psy);
4a11b59d	206	device_unregister(psy->dev);
4a11b59d	207	}
ff3417e7	208	EXPORT_SYMBOL_GPL(power_supply_unregister);
4a11b59d AV	209
	210	static int __init power_supply_class_init(void)
	211	{
	212	power_supply_class = class_create(THIS_MODULE, "power_supply");
	213
	214	if (IS_ERR(power_supply_class))
	215	return PTR_ERR(power_supply_class);
	216
	217	power_supply_class->dev_uevent = power_supply_uevent;
5f487cd3	218	power_supply_init_attrs(&power_supply_dev_type);
4a11b59d AV	219
	220	return 0;
	221	}
	222
	223	static void __exit power_supply_class_exit(void)
	224	{
	225	class_destroy(power_supply_class);
4a11b59d AV	226	}
4a11b59d AV	227
4a11b59d AV	228	subsys_initcall(power_supply_class_init);
	229	module_exit(power_supply_class_exit);
	230
	231	MODULE_DESCRIPTION("Universal power supply monitor class");
	232	MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	233	"Szabolcs Gyurko, "
	234	"Anton Vorontsov <cbou@mail.ru>");
	235	MODULE_LICENSE("GPL");