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#!/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
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