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bq27x00: Poll battery state 

This patch adds support for polling the battery state and generating a
power_supply_changed() event if it has changed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>
This commit is contained in:
Lars-Peter Clausen 2011-01-07 20:14:53 +01:00
parent 297a533b3e
commit 740b755a3b
1 changed files with 53 additions and 5 deletions
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58
drivers/power/bq27x00_battery.c
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@ -74,10 +74,13 @@ struct bq27x00_device_info {
struct bq27x00_reg_cache cache;
unsigned long last_update;
struct delayed_work work;
struct power_supply bat;
struct bq27x00_access_methods bus;
struct mutex lock;
};
static enum power_supply_property bq27x00_battery_props[] = {
@ -93,6 +96,11 @@ static enum power_supply_property bq27x00_battery_props[] = {
POWER_SUPPLY_PROP_TECHNOLOGY,
};
static unsigned int poll_interval = 360;
module_param(poll_interval, uint, 0644);
MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
"0 disables polling");
/*
* Common code for BQ27x00 devices
*/
@ -169,6 +177,21 @@ static void bq27x00_update(struct bq27x00_device_info *di)
di->last_update = jiffies;
}
static void bq27x00_battery_poll(struct work_struct *work)
{
struct bq27x00_device_info *di =
container_of(work, struct bq27x00_device_info, work.work);
bq27x00_update(di);
if (poll_interval > 0) {
/* The timer does not have to be accurate. */
set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
schedule_delayed_work(&di->work, poll_interval * HZ);
}
}
/*
* Return the battery temperature in tenths of degree Celsius
* Or < 0 if something fails.
@ -283,8 +306,12 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
int ret = 0;
struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
if (time_is_before_jiffies(di->last_update + 5 * HZ))
bq27x00_update(di);
mutex_lock(&di->lock);
if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
cancel_delayed_work_sync(&di->work);
bq27x00_battery_poll(&di->work.work);
}
mutex_unlock(&di->lock);
if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
return -ENODEV;
@ -327,6 +354,14 @@ static int bq27x00_battery_get_property(struct power_supply *psy,
return ret;
}
static void bq27x00_external_power_changed(struct power_supply *psy)
{
struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
cancel_delayed_work_sync(&di->work);
schedule_delayed_work(&di->work, 0);
}
static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
{
int ret;
@ -335,7 +370,10 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
di->bat.properties = bq27x00_battery_props;
di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
di->bat.get_property = bq27x00_battery_get_property;
di->bat.external_power_changed = NULL;
di->bat.external_power_changed = bq27x00_external_power_changed;
INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
mutex_init(&di->lock);
ret = power_supply_register(di->dev, &di->bat);
if (ret) {
@ -350,6 +388,15 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
return 0;
}
static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
{
cancel_delayed_work_sync(&di->work);
power_supply_unregister(&di->bat);
mutex_destroy(&di->lock);
}
/* i2c specific code */
#ifdef CONFIG_BATTERY_BQ27X00_I2C
@ -457,7 +504,7 @@ static int bq27x00_battery_remove(struct i2c_client *client)
{
struct bq27x00_device_info *di = i2c_get_clientdata(client);
power_supply_unregister(&di->bat);
bq27x00_powersupply_unregister(di);
kfree(di->bat.name);
@ -590,7 +637,8 @@ static int __devexit bq27000_battery_remove(struct platform_device *pdev)
{
struct bq27x00_device_info *di = platform_get_drvdata(pdev);
power_supply_unregister(&di->bat);
bq27x00_powersupply_unregister(di);
platform_set_drvdata(pdev, NULL);
kfree(di);