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-rw-r--r--drivers/power/power_supply_core.c38
1 files changed, 32 insertions, 6 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 3b2d5df45e7a..00e667296360 100644
--- 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);