def METHOD_NAME(self, file):
    """
    get cpu_freq values
    :param: file: is filename for which data needs to be fetched
    """
    f_name = "/sys/devices/system/cpu/cpu%s/cpufreq/%s" % (
        self.cpu_num, file)
    return genio.read_file(f_name).rstrip('\n').strip(' ')