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Date: Sun, 6 Feb 2011 01:48:05 +0100 From: Lars-Peter Clausen <lars@...afoo.de> To: Anton Vorontsov <cbouatmailru@...il.com> Cc: Rodolfo Giometti <giometti@...ux.it>, Grazvydas Ignotas <notasas@...il.com>, linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de> Subject: [PATCH 08/14] POWER: 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@...afoo.de> --- drivers/power/bq27x00_battery.c | 47 +++++++++++++++++++++++++++++++++++--- 1 files changed, 43 insertions(+), 4 deletions(-) diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index cabc7c9..0dc7771 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -19,6 +19,7 @@ #include <linux/module.h> #include <linux/param.h> #include <linux/jiffies.h> +#include <linux/workqueue.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/power_supply.h> @@ -74,6 +75,7 @@ struct bq27x00_device_info { struct bq27x00_reg_cache cache; unsigned long last_update; + struct delayed_work work; struct power_supply bat; @@ -93,6 +95,11 @@ 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 */ @@ -282,7 +289,7 @@ static int bq27x00_battery_get_property(struct power_supply *psy, struct bq27x00_device_info *di = to_bq27x00_device_info(psy); if (time_is_before_jiffies(di->last_update + 6 * HZ)) - bq27x00_update(di); + flush_delayed_work_sync(&di->work); if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.voltage <= 0) return -ENODEV; @@ -325,6 +332,28 @@ static int bq27x00_battery_get_property(struct power_supply *psy, return ret; } +static void bq27x00_battery_work(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); + } +} + +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; @@ -333,7 +362,9 @@ 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_work); ret = power_supply_register(di->dev, &di->bat); if (ret) { @@ -348,6 +379,13 @@ 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); +} + /* i2c specific code */ #ifdef CONFIG_BATTERY_BQ27X00_I2C @@ -455,7 +493,7 @@ 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); @@ -588,7 +626,8 @@ 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); -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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