[PATCH 08/14] POWER: bq27x00: Poll battery state

[Lars-Peter Clausen <lars@metafoo.de>]

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>
---
 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