[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"

struct class *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);
}

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;
}

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;
}

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);
}

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);
}

EXPORT_SYMBOL_GPL(power_supply_changed);
EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
EXPORT_SYMBOL_GPL(power_supply_register);
EXPORT_SYMBOL_GPL(power_supply_unregister);

/* exported for the APM Power driver, APM emulation */
EXPORT_SYMBOL_GPL(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
	21	struct class *power_supply_class;
	22
443cad92 DY	23	static int __power_supply_changed_work(struct device dev, void data)
	24	{
	25	struct power_supply psy = (struct power_supply )data;
	26	struct power_supply *pst = dev_get_drvdata(dev);
	27	int i;
	28
	29	for (i = 0; i < psy->num_supplicants; i++)
	30	if (!strcmp(psy->supplied_to[i], pst->name)) {
	31	if (pst->external_power_changed)
	32	pst->external_power_changed(pst);
	33	}
	34	return 0;
	35	}
	36
4a11b59d AV	37	static void power_supply_changed_work(struct work_struct *work)
	38	{
	39	struct power_supply *psy = container_of(work, struct power_supply,
	40	changed_work);
4a11b59d	41
0cddc0a9	42	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d	43
93562b53	44	class_for_each_device(power_supply_class, NULL, psy,
443cad92	45	__power_supply_changed_work);
4a11b59d AV	46
	47	power_supply_update_leds(psy);
	48
	49	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
4a11b59d AV	50	}
	51
	52	void power_supply_changed(struct power_supply *psy)
	53	{
0cddc0a9	54	dev_dbg(psy->dev, "%s\n", __func__);
4a11b59d AV	55
4a11b59d AV	56	schedule_work(&psy->changed_work);
4a11b59d AV	57	}
4a11b59d AV	58
443cad92	59	static int __power_supply_am_i_supplied(struct device dev, void data)
4a11b59d AV	60	{
4a11b59d AV	61	union power_supply_propval ret = {0,};
443cad92 DY	62	struct power_supply psy = (struct power_supply )data;
	63	struct power_supply *epsy = dev_get_drvdata(dev);
	64	int i;
	65
	66	for (i = 0; i < epsy->num_supplicants; i++) {
	67	if (!strcmp(epsy->supplied_to[i], psy->name)) {
	68	if (epsy->get_property(epsy,
	69	POWER_SUPPLY_PROP_ONLINE, &ret))
	70	continue;
	71	if (ret.intval)
	72	return ret.intval;
4a11b59d AV	73	}
4a11b59d AV	74	}
443cad92 DY	75	return 0;
	76	}
	77
	78	int power_supply_am_i_supplied(struct power_supply *psy)
	79	{
	80	int error;
	81
93562b53	82	error = class_for_each_device(power_supply_class, NULL, psy,
443cad92	83	__power_supply_am_i_supplied);
4a11b59d	84
0cddc0a9	85	dev_dbg(psy->dev, "%s %d\n", __func__, error);
4a11b59d	86
443cad92	87	return error;
4a11b59d AV	88	}
	89
	90	int power_supply_register(struct device parent, struct power_supply psy)
	91	{
	92	int rc = 0;
	93
a9b12619 GKH	94	psy->dev = device_create(power_supply_class, parent, 0, psy,
a9b12619 GKH	95	"%s", psy->name);
4a11b59d AV	96	if (IS_ERR(psy->dev)) {
	97	rc = PTR_ERR(psy->dev);
	98	goto dev_create_failed;
	99	}
	100
4a11b59d AV	101	INIT_WORK(&psy->changed_work, power_supply_changed_work);
	102
	103	rc = power_supply_create_attrs(psy);
	104	if (rc)
	105	goto create_attrs_failed;
	106
	107	rc = power_supply_create_triggers(psy);
	108	if (rc)
	109	goto create_triggers_failed;
	110
	111	power_supply_changed(psy);
	112
	113	goto success;
	114
	115	create_triggers_failed:
	116	power_supply_remove_attrs(psy);
	117	create_attrs_failed:
	118	device_unregister(psy->dev);
	119	dev_create_failed:
	120	success:
	121	return rc;
	122	}
	123
	124	void power_supply_unregister(struct power_supply *psy)
	125	{
	126	flush_scheduled_work();
	127	power_supply_remove_triggers(psy);
	128	power_supply_remove_attrs(psy);
	129	device_unregister(psy->dev);
4a11b59d AV	130	}
	131
	132	static int __init power_supply_class_init(void)
	133	{
	134	power_supply_class = class_create(THIS_MODULE, "power_supply");
	135
	136	if (IS_ERR(power_supply_class))
	137	return PTR_ERR(power_supply_class);
	138
	139	power_supply_class->dev_uevent = power_supply_uevent;
	140
	141	return 0;
	142	}
	143
	144	static void __exit power_supply_class_exit(void)
	145	{
	146	class_destroy(power_supply_class);
4a11b59d AV	147	}
	148
	149	EXPORT_SYMBOL_GPL(power_supply_changed);
	150	EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
	151	EXPORT_SYMBOL_GPL(power_supply_register);
	152	EXPORT_SYMBOL_GPL(power_supply_unregister);
	153
	154	/* exported for the APM Power driver, APM emulation */
	155	EXPORT_SYMBOL_GPL(power_supply_class);
	156
	157	subsys_initcall(power_supply_class_init);
	158	module_exit(power_supply_class_exit);
	159
	160	MODULE_DESCRIPTION("Universal power supply monitor class");
	161	MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
	162	"Szabolcs Gyurko, "
	163	"Anton Vorontsov <cbou@mail.ru>");
	164	MODULE_LICENSE("GPL");