int acpi_bus_register_driver (struct acpi_driver *driver);
int acpi_bus_unregister_driver (struct acpi_driver *driver);
int acpi_bus_scan (struct acpi_device *start);
-int acpi_bus_trim(struct acpi_device *start, int rmdevice);
int acpi_bus_add (struct acpi_device **child, struct acpi_device *parent,
acpi_handle handle, int type);