#!/bin/sh
### BEGIN INIT INFO
# Provides:       cpufrequtils
# Required-Start: $remote_fs loadcpufreq
# Required-Stop:
# Default-Start:  2 3 4 5
# Default-Stop:
# Short-Description: set CPUFreq kernel parameters
# Description: utilities to deal with CPUFreq Linux 
#       kernel support
### END INIT INFO
# 

DESC="CPUFreq Utilities"

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
CPUFREQ_SET=/usr/bin/cpufreq-set
CPUFREQ_INFO=/usr/bin/cpufreq-info
CPUFREQ_OPTIONS=""

# use lsb-base
. /lib/lsb/init-functions

# Which governor to use. Must be one of the governors listed in:
#   cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
#
# and which limits to set. Both MIN_SPEED and MAX_SPEED must be values
# listed in:
#   cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
# a value of 0 for any of the two variables will disabling the use of 
# that limit variable.
#
# WARNING: the correct kernel module must already be loaded or compiled in.
# 
# Set ENABLE to "true" to let the script run at boot time.
# 
# eg:     ENABLE="true"
#       GOVERNOR="ondemand"
# MAX_SPEED=1000
#      MIN_SPEED=500

ENABLE="true"
GOVERNOR="ondemand"
FREQ="1200000"
MAX_SPEED="0"
MIN_SPEED="0"
FREQ_OR_GOVERNOR="freq"

check_governor_avail() {
     info="/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors"
      if < -f $info > && grep -q "\<$GOVERNOR\>" $info ; then
            return 0;
    fi
   return 1;
}

check_freq_avail() {
      info="/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
    if < -f $info > && grep -q "\<$FREQ\>" $info ; then
                return 0;
    fi
   return 1;
}

< -x $CPUFREQ_SET > || exit 0

if < -f /etc/default/cpufrequtils > ; then
        . /etc/default/cpufrequtils
fi

# if not enabled then exit gracefully
< "$ENABLE" = "true" > || exit 0

if < -n "$MAX_SPEED" > && < $MAX_SPEED != "0" > ; then
  CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --max $MAX_SPEED"
fi

if < -n "$MIN_SPEED" > && < $MIN_SPEED != "0" > ; then
        CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --min $MIN_SPEED"
fi

case "$FREQ_OR_GOVERNOR" in
governor)
        if < -n "$GOVERNOR" > ; then
            CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --governor $GOVERNOR"
       fi
;;
freq)
     if < -n "$FREQ" > ; then
                CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --freq $FREQ"
       fi
;;
esac

CPUS=$(cat /proc/stat|sed -ne 's/^cpu\(<<:digit:>>\+\).*/\1/p')
RETVAL=0
case "$1" in
    start|force-reload|restart|reload)
           case "$FREQ_OR_GOVERNOR" in
         governor)
                   log_action_begin_msg "$DESC: Setting $GOVERNOR CPUFreq governor"
                   if check_governor_avail ; then
                               for cpu in $CPUS ; do
                                log_action_cont_msg "CPU${cpu}"
                                     $CPUFREQ_SET --cpu $cpu $CPUFREQ_OPTIONS 2>&1 > /dev/null || \
                                                RETVAL=$?
                           done
                                log_action_end_msg $RETVAL ""
                       else
                                log_action_cont_msg "disabled, governor not available"
                              log_action_end_msg $RETVAL
                 fi
          ;;

            freq)
                       log_action_begin_msg "$DESC: Setting $FREQ CPUFreq freq"
                   if check_freq_avail ; then
                           for cpu in $CPUS ; do
                                log_action_cont_msg "CPU${cpu}"
                                     $CPUFREQ_SET --cpu $cpu $CPUFREQ_OPTIONS 2>&1 > /dev/null || \
                                                RETVAL=$?
                           done
                                log_action_end_msg $RETVAL ""
                       else
                                log_action_cont_msg "disabled, freq not available"
                          log_action_end_msg $RETVAL
                 fi
          ;;
         esac
                ;;
 stop)
               ;;
 *)
          echo "Usage: $0 {start|stop|restart|reload|force-reload}"
          exit 1
esac

exit 0