2 files changed, 26 insertions, 0 deletions

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 <linux/init.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/notifier.h>
 #include <linux/err.h>
 #include <linux/power_supply.h>
 #include <linux/thermal.h>
@@ -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 <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);