Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752910Ab1BLTk3 (ORCPT ); Sat, 12 Feb 2011 14:40:29 -0500 Received: from smtp-out-246.synserver.de ([212.40.185.246]:1095 "HELO smtp-out-246.synserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752666Ab1BLTjl (ORCPT ); Sat, 12 Feb 2011 14:39:41 -0500 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@laprican.de X-SynServer-PPID: 24377 From: Lars-Peter Clausen To: Anton Vorontsov Cc: Rodolfo Giometti , Grazvydas Ignotas , linux-kernel@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH 08/14] bq27x00: Poll battery state Date: Sat, 12 Feb 2011 20:39:08 +0100 Message-Id: <1297539554-13957-10-git-send-email-lars@metafoo.de> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1297539554-13957-1-git-send-email-lars@metafoo.de> References: <1297539554-13957-1-git-send-email-lars@metafoo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4574 Lines: 153 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 --- drivers/power/bq27x00_battery.c | 59 +++++++++++++++++++++++++++++++++++--- 1 files changed, 54 insertions(+), 5 deletions(-) diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index 0c94693..061c5a5 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -73,10 +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[] = { @@ -92,6 +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 */ @@ -168,6 +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. @@ -282,8 +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; @@ -326,6 +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; @@ -334,7 +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) { @@ -349,6 +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 @@ -456,7 +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); @@ -589,7 +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); -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/