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path: root/drivers/power/power_supply_core.c
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Diffstat (limited to 'drivers/power/power_supply_core.c')
-rw-r--r--drivers/power/power_supply_core.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 329b46b2327..6ad61272678 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -98,7 +98,9 @@ static int __power_supply_is_system_supplied(struct device *dev, void *data)
{
union power_supply_propval ret = {0,};
struct power_supply *psy = dev_get_drvdata(dev);
+ unsigned int *count = data;
+ (*count)++;
if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
return 0;
@@ -111,10 +113,18 @@ static int __power_supply_is_system_supplied(struct device *dev, void *data)
int power_supply_is_system_supplied(void)
{
int error;
+ unsigned int count = 0;
- error = class_for_each_device(power_supply_class, NULL, NULL,
+ error = class_for_each_device(power_supply_class, NULL, &count,
__power_supply_is_system_supplied);
+ /*
+ * If no power class device was found at all, most probably we are
+ * running on a desktop system, so assume we are on mains power.
+ */
+ if (count == 0)
+ return 1;
+
return error;
}
EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
@@ -147,6 +157,12 @@ struct power_supply *power_supply_get_by_name(char *name)
}
EXPORT_SYMBOL_GPL(power_supply_get_by_name);
+int power_supply_powers(struct power_supply *psy, struct device *dev)
+{
+ return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
+}
+EXPORT_SYMBOL_GPL(power_supply_powers);
+
static void power_supply_dev_release(struct device *dev)
{
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
@@ -202,6 +218,7 @@ EXPORT_SYMBOL_GPL(power_supply_register);
void power_supply_unregister(struct power_supply *psy)
{
cancel_work_sync(&psy->changed_work);
+ sysfs_remove_link(&psy->dev->kobj, "powers");
power_supply_remove_triggers(psy);
device_unregister(psy->dev);
}