Merge tag 'xtensa-next-20130912' of git://github.com/czankel/xtensa-linux

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / power / power_supply_core.c

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 3b2d5df..00e6672 100644 (file)
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -67,23 +67,42 @@ static int __power_supply_changed_work(struct device *dev, void *data)
 
 static void power_supply_changed_work(struct work_struct *work)
 {
+       unsigned long flags;
        struct power_supply *psy = container_of(work, struct power_supply,
                                                changed_work);
 
        dev_dbg(psy->dev, "%s\n", __func__);
 
-       class_for_each_device(power_supply_class, NULL, psy,
-                             __power_supply_changed_work);
-
-       power_supply_update_leds(psy);
-
-       kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
+       spin_lock_irqsave(&psy->changed_lock, flags);
+       if (psy->changed) {
+               psy->changed = false;
+               spin_unlock_irqrestore(&psy->changed_lock, flags);
+               class_for_each_device(power_supply_class, NULL, psy,
+                                     __power_supply_changed_work);
+               power_supply_update_leds(psy);
+               kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
+               spin_lock_irqsave(&psy->changed_lock, flags);
+       }
+       /*
+        * Dependent power supplies (e.g. battery) may have changed state
+        * as a result of this event, so poll again and hold the
+        * wakeup_source until all events are processed.
+        */
+       if (!psy->changed)
+               pm_relax(psy->dev);
+       spin_unlock_irqrestore(&psy->changed_lock, flags);
 }
 
 void power_supply_changed(struct power_supply *psy)
 {
+       unsigned long flags;
+
        dev_dbg(psy->dev, "%s\n", __func__);
 
+       spin_lock_irqsave(&psy->changed_lock, flags);
+       psy->changed = true;
+       pm_stay_awake(psy->dev);
+       spin_unlock_irqrestore(&psy->changed_lock, flags);
        schedule_work(&psy->changed_work);
 }
 EXPORT_SYMBOL_GPL(power_supply_changed);
@@ -500,6 +519,11 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
                goto check_supplies_failed;
        }
 
+       spin_lock_init(&psy->changed_lock);
+       rc = device_init_wakeup(dev, true);
+       if (rc)
+               goto wakeup_init_failed;
+
        rc = kobject_set_name(&dev->kobj, "%s", psy->name);
        if (rc)
                goto kobject_set_name_failed;
@@ -529,6 +553,7 @@ create_triggers_failed:
 register_cooler_failed:
        psy_unregister_thermal(psy);
 register_thermal_failed:
+wakeup_init_failed:
        device_del(dev);
 kobject_set_name_failed:
 device_add_failed:
@@ -546,6 +571,7 @@ void power_supply_unregister(struct power_supply *psy)
        power_supply_remove_triggers(psy);
        psy_unregister_cooler(psy);
        psy_unregister_thermal(psy);
+       device_init_wakeup(psy->dev, false);
        device_unregister(psy->dev);
 }
 EXPORT_SYMBOL_GPL(power_supply_unregister);