-
-int acpi_dev_turn_off_if_unused(struct device *dev, void *not_used)
-{
- struct acpi_device *adev = to_acpi_device(dev);
-
- /*
- * Skip device objects with device IDs, because they may be in use even
- * if they are not companions of any physical device objects.
- */
- if (adev->pnp.type.hardware_id)
- return 0;
-
- mutex_lock(&adev->physical_node_lock);
-
- /*
- * Device objects without device IDs are not in use if they have no
- * corresponding physical device objects.
- */
- if (list_empty(&adev->physical_node_list))
- acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
-
- mutex_unlock(&adev->physical_node_lock);
-
- return 0;
-}