diff options
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/bq27x00_battery.c | 58 |
1 files changed, 53 insertions, 5 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index dbe3fcb3b0ba..25350fcbadb3 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -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); |