power_supply: Add power_supply notifier

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 <jenny.tc@intel.com>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Acked-by: Jenny TC <jenny.tc@intel.com>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 5c26006..3e28fe1 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -16,6 +16,7 @@
 #include <linux/workqueue.h>
 #include <linux/leds.h>
 #include <linux/spinlock.h>
+#include <linux/notifier.h>
 
 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);