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#!/bin/bash -e
## This file is licensed under the GNU General Public License, version 2.
VERSION=0.4.0
_conf='/etc/default/phc-intel'
msg() {
printf '%s\n' "$@"
}
errmsg() {
msg "$@" > /dev/stderr
}
check_conf_and_set() {
if [ -r "${_conf}" ]; then
. "${_conf}"
if [ -z "$VIDS" ]; then
errmsg "=> Please edit '${_conf}'."
exit 1
fi
msg ':: Setting PHC VIDs'
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
echo $VIDS > "$i"
done
else
errmsg "$0: Error: Config file '${_conf}' not present."
exit 2
fi
}
check_kernel_cmdline() {
for i in $(< /proc/cmdline); do
if [ $i = nophc ]; then
errmsg "=> 'nophc' kernel option set, not setting PHC VIDs."
errmsg " Use '$0 force-set' to override."
exit 0
return 1
fi
done
}
shopt -s nullglob
case "$1" in
start)
check_kernel_cmdline "$@" || exit 0
check_conf_and_set "$@"
;;
stop|reset)
msg ':: Resetting default PHC VIDs'
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
cp "${i%vids}default_vids" "$i"
done
;;
status)
check_off () {
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
[ "$(< "$i")" = "$(< "${i%vids}default_vids")" ] || return;
done
}
check_on () {
for i in /sys/devices/system/cpu/cpu*/cpufreq/phc_vids; do
[[ "$(< "$i")" =~ "$VIDS" ]] || return;
done
}
printf '%s' 'PHC status: '
. "${_conf}"
if check_off; then
msg 'inactive'
elif check_on; then
msg 'active'
else
msg 'unknown'
fi
;;
set)
"$0" start
;;
force-set)
check_conf_and_set "$@"
;;
reset)
"$0" stop
;;
--version)
printf '%s\n' "${VERSION}"
;;
*)
echo "usage: $0 {start|stop|status|set|force-set|reset|--version}"
;;
esac
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