code: func (w *WiichuckDriver) setJoystickDefaultValue(joystickAxis string, defaultValue float64) {
  	w.mtx.Lock()
  	defer w.mtx.Unlock()
  	if w.joystick[joystickAxis] == -1 {
  		w.joystick[joystickAxis] = defaultValue
  	}
  }
docs: // setJoystickDefaultValue sets default value if value is -1