165 lines
3.8 KiB
C
165 lines
3.8 KiB
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");
|