From d36240d26025bec95f3499e2401a56db98d9f01c 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: [PATCH] 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 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 ++++++++++++++++++ include/linux/power_supply.h | 8 ++++++++ 2 files changed, 26 insertions(+) diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index 557af943b2f5..6aac23cc6566 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) diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 5c2600630dc9..3e28fe188d17 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -16,6 +16,7 @@ #include #include #include +#include struct device; @@ -158,6 +159,10 @@ enum power_supply_type { POWER_SUPPLY_TYPE_USB_ACA, /* Accessory Charger Adapters */ }; +enum power_supply_notifier_events { + PSY_EVENT_PROP_CHANGED, +}; + union power_supply_propval { int intval; const char *strval; @@ -235,6 +240,9 @@ struct power_supply_info { int use_for_apm; }; +extern struct atomic_notifier_head power_supply_notifier; +extern int power_supply_reg_notifier(struct notifier_block *nb); +extern void power_supply_unreg_notifier(struct notifier_block *nb); extern struct power_supply *power_supply_get_by_name(const char *name); extern void power_supply_changed(struct power_supply *psy); extern int power_supply_am_i_supplied(struct power_supply *psy);