#! /bin/sh
# Init script for powernowd
#
### BEGIN INIT INFO
# Provides:          powernowd
# Required-Start:    $syslog $local_fs $time
# Required-Stop:     $syslog $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:	     0 1 6
# Short-Description: Start powernowd .
### END INIT INFO


PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/sbin/powernowd
NAME=powernowd
DESC=powernowd
OPTIONS="-q"

test -x $DAEMON || exit 0

# modify the file /etc/default/powernowd if you want to add personal options

[ -f /etc/default/$NAME ] && . /etc/default/$NAME

# Get lsb functions
. /lib/lsb/init-functions
. /etc/default/rcS

if [ "x$VERBOSE" = "xno" ]; then
        MODPROBE_OPTIONS="$MODPROBE_OPTIONS -Q"
        export MODPROBE_OPTIONS
fi

set -e

load_modules() {

        modprobe cpufreq-userspace || return 1
        
        #cpufreq is built in on powerpc; just return
        [ "`uname -m`" = "ppc" ] && return 0


        #new style detection system
        if [ "$FREQDRIVER" ]; then 
                modprobe "$FREQDRIVER"
        else
	        . /usr/share/powernowd/cpufreq-detect.sh
                [ "$MODULE" ] && (modprobe "$MODULE" || modprobe "$MODULE_FALLBACK")
        fi

        if [ "`uname -m`" = "x86_64" ]; then 
                modprobe powernow-k8 || true
        fi
}

check_kernel() {
	CPUFREQ=/sys/devices/system/cpu/cpu0/cpufreq

	if [ -f "$CPUFREQ/scaling_governor" ] && \
		[ -f "$CPUFREQ/scaling_available_governors" ] && \
		grep -q userspace "$CPUFREQ/scaling_available_governors"
	then
		return 0
	else
		return 1
	fi
}

start() {
       	log_begin_msg "Starting $DESC... "
        load_modules
	if check_kernel
	then
		start-stop-daemon --start --quiet --oknodo --exec $DAEMON -- $OPTIONS >/dev/null 2>&1 || {
                    status=$?
                    log_end_msg $status
                    return $status
                }
	else
		log_action_cont_msg "CPU frequency scaling not supported"
	fi
       	log_end_msg 0
	return 0
}

case "$1" in
  start)
	start
	;;
  stop)
	log_begin_msg "Stopping $DESC: "
	start-stop-daemon --stop --quiet --oknodo --exec $DAEMON
	for x in /sys/devices/system/cpu/cpu[0-9]*/; do
	    if [ -f $x"cpufreq/scaling_governor" ]; then
		echo -n performance > $x"cpufreq/scaling_governor";
	    fi
	done
	log_end_msg $?
	;;
  restart|force-reload)
        $0 stop
	sleep 1
	$0 start
	;;
  *)
	N=/etc/init.d/$NAME
	log_success_msg "Usage: $N {start|stop|restart|force-reload}" >&2
	exit 1
	;;
esac

exit 0