diff options
Diffstat (limited to 'drivers/power/power_supply_core.c')
| -rw-r--r-- | drivers/power/power_supply_core.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index 329b46b2327d..6ad612726785 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); } |