From 9e39c7ce34b53aa9f7766edafc22377cb4d7e382 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= Date: Tue, 19 Nov 2013 11:18:03 +0100 Subject: power_supply: Add power_supply notifier MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds a notifier chain to the power_supply, this helps drivers in other subsystem to listen to changes in power supply subsystem. This would help to take some actions in those drivers on changing the power supply properties. One such scenario is to increase/decrease system performance based on the battery capacity/voltage. Another scenario is to adjust the h/w peak current detection voltage/current thresholds based on battery voltage/capacity. The notifier helps drivers to listen to changes in power_suppy susbystem without polling the power_supply properties Change-Id: I06d5b614d1ad836826f87f24791c94d2fa6c4aa6 Signed-off-by: Jenny TC Signed-off-by: Pali Rohár Acked-by: Jenny TC Signed-off-by: Anton Vorontsov --- drivers/power/power_supply_core.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers') diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index 557af943b2f..6aac23cc656 100644 --- a/drivers/power/power_supply_core.c +++ b/drivers/power/power_supply_core.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -24,6 +25,9 @@ struct class *power_supply_class; EXPORT_SYMBOL_GPL(power_supply_class); +ATOMIC_NOTIFIER_HEAD(power_supply_notifier); +EXPORT_SYMBOL_GPL(power_supply_notifier); + static struct device_type power_supply_dev_type; static bool __power_supply_is_supplied_by(struct power_supply *supplier, @@ -80,6 +84,8 @@ static void power_supply_changed_work(struct work_struct *work) class_for_each_device(power_supply_class, NULL, psy, __power_supply_changed_work); power_supply_update_leds(psy); + atomic_notifier_call_chain(&power_supply_notifier, + PSY_EVENT_PROP_CHANGED, psy); kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); spin_lock_irqsave(&psy->changed_lock, flags); } @@ -347,6 +353,18 @@ static void power_supply_dev_release(struct device *dev) kfree(dev); } +int power_supply_reg_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&power_supply_notifier, nb); +} +EXPORT_SYMBOL_GPL(power_supply_reg_notifier); + +void power_supply_unreg_notifier(struct notifier_block *nb) +{ + atomic_notifier_chain_unregister(&power_supply_notifier, nb); +} +EXPORT_SYMBOL_GPL(power_supply_unreg_notifier); + #ifdef CONFIG_THERMAL static int power_supply_read_temp(struct thermal_zone_device *tzd, unsigned long *temp) -- cgit v1.2.3