#!/bin/sh

. "${PM_FUNCTIONS}"

[ -d /sys/devices/system/cpu/ ] || exit $NA

hibernate_cpufreq()
{
	( cd /sys/devices/system/cpu/
	for x in cpu[0-9]*; do
		# if cpufreq is a symlink, it is handled by another cpu. Skip.
		[ -L "$x/cpufreq" ] && continue
		gov="$x/cpufreq/scaling_governor"
		# if we do not have a scaling_governor file, skip.
		[ -f "$gov" ] || continue
		# if our temporary governor is not available, skip.
		grep -q "$TEMPORARY_CPUFREQ_GOVERNOR" \
			"$x/cpufreq/scaling_available_governors" || continue
		savestate "${x}_governor" $(cat "$gov")
		echo "$TEMPORARY_CPUFREQ_GOVERNOR" > "$gov"
	done )
}

thaw_cpufreq()
{
	( cd /sys/devices/system/cpu/
	for x in cpu[0-9]*/cpufreq/scaling_governor ; do
		[ -f "$x" ] || continue
		local gov="$(restorestate "${x%%/*}_governor")"
		[ -z "$gov" ] && continue
		echo "$gov" > "$x"
	done )
}

case "$1" in
	suspend*|hibernate)
		hibernate_cpufreq
		;;
	resume|thaw)
		thaw_cpufreq
		;;
	*) exit $NA
		;;
esac