def METHOD_NAME(self):
    """
    Retrieves the target (expected) speed of the fan
    Returns:
        An integer, the percentage of full fan speed, in the range 0 (off)
             to 100 (full speed)
    Note:
        speed_pc = pwm_target/255*100
        0   : when PWM mode is use
        pwm : when pwm mode is not use
    """
    # target = 0
    # fan_target_sysfs_name = "pwm{}".format(self.fan_index+1)
    # fan_target_sysfs_path = self.__search_file_by_name(
    #     FAN_PATH, fan_target_sysfs_name)
    # fan_target_pwm = self.__read_txt_file(fan_target_sysfs_path) or 0
    # target = math.ceil(float(fan_target_pwm) * 100 / FAN_MAX_PWM)
    # return target
    speed = 0
    fan_speed_sysfs_name = "fan{}_input".format(self.fan_index+1)
    fan_speed_sysfs_path = self.__search_file_by_name(
        FAN_PATH, fan_speed_sysfs_name)
    fan_speed_rpm = self.__read_txt_file(fan_speed_sysfs_path) or 0
    speed = math.ceil(float(fan_speed_rpm) * 100 / FAN_MAX_RPM)
    return speed