'Return the driveinfo dictionary. Usually called from
get_device_information(), but if loading the driveinfo is slow for this
driver, then it should set SLOW_DRIVEINFO. In this case, this method
will be called by calibre after the book lists have been loaded. Note
that it is not called on the device thread, so the driver should cache
the drive info in the books() method and this function should return
the cached data.'

def get_driveinfo(self):

    return {}
