'Initialize Vizio device.'

def __init__(self, host, token, name, volume_step):

    import pyvizio
    self._device = pyvizio.Vizio(DEVICE_ID, host, DEFAULT_NAME, token)
    self._name = name
    self._state = STATE_UNKNOWN
    self._volume_level = None
    self._volume_step = volume_step
    self._current_input = None
    self._available_inputs = None
