diff options
| -rw-r--r-- | drivers/power/power_supply_core.c | 38 | ||||
| -rw-r--r-- | include/linux/power_supply.h | 3 |
2 files changed, 35 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); diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 804b90643a85..5c2600630dc9 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -15,6 +15,7 @@ #include <linux/workqueue.h> #include <linux/leds.h> +#include <linux/spinlock.h> struct device; @@ -194,6 +195,8 @@ struct power_supply { /* private */ struct device *dev; struct work_struct changed_work; + spinlock_t changed_lock; + bool changed; #ifdef CONFIG_THERMAL struct thermal_zone_device *tzd; struct thermal_cooling_device *tcd; |