#!/bin/sh

# set the HWP preference for all cpus in sysfs

cpus="/sys/devices/system/cpu/cpu*/cpufreq/energy_performance_preference"

usage() {
	script=${0##*/}
	echo
	echo "Invalid usage of ${script}!"
    echo
    echo "The following options are allowed"
    echo
	echo "-----------"
	echo "$script -1 : default"
	echo "$script 0  : power"
	echo "$script 1  : balance_power"
	echo "$script 2  : balance_performance"
	echo "$script 3  : performance"
	echo "-----------"
	echo

	exit 1
}

set_pref() {
    for cpu in $cpus; do
        echo "$1" > "$cpu"
    done
}

case "$1" in
  -1)
    set_pref "default"
    ;;
  0)
    set_pref "power"
    ;;
  1)
    set_pref "balance_power"
    ;;
  2)
    set_pref "balance_performance"
    ;;
  3)
    set_pref "performance"
    ;;
  *)
    usage "invalid argument"
esac