#!/bin/bash
###########################################################################
#                                                                         #
#                         Powersave Daemon                                #
#                                                                         #
#          Copyright (C) 2004,2005 SUSE Linux Products GmbH               #
#                                                                         #
# This program is free software; you can redistribute it and/or modify it #
# under the terms of the GNU General Public License as published by the   #
# Free Software Foundation; either version 2 of the License, or (at you   #
# option) any later version.                                              #
#                                                                         #
# This program is distributed in the hope that it will be useful, but     #
# WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       #
# General Public License for more details.                                #
#                                                                         #
# You should have received a copy of the GNU General Public License along #
# with this program; if not, write to the Free Software Foundation, Inc., #
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA                  #
#                                                                         #
#                                                                         #
# Author: Thomas Renninger <trenn@suse.de, mail@renninger.de>             #
#                                                                         #
###########################################################################
#
# /etc/init.d/powersave
#   and its symbolic link
# /usr/sbin/rcpowersave
#
# LSB compliant service control script; see http://www.linuxbase.org/spec/
# 
# Should start contains acpid apmd and cpufreqd, so that I can check
# whether they are running and whether this script should fail
# apmd and cpufreqd should never run together with this service

### BEGIN INIT INFO
# Provides:                   powersaved
# Required-Start:             $remote_fs dbus haldaemon
# Should-Start:               $syslog acpid
# X-UnitedLinux-Should-Start: $syslog acpid dbus haldaemon
# Required-Stop:              $remote_fs dbus haldaemon
# Should-Stop:                $syslog acpid
# X-UnitedLinux-Should-Stop:  $syslog dbus haldaemon acpid
# Default-Start:              2 3 5
# Default-Stop:               0 1 6
# Short-Description: optimises power consumption, specially for laptops
# Description:       supports acpi apm and cpufrequency scaling
#	detects HW support for mentioned systems and optimises power consumption
#	accordingly. 
#       Back-end to the YaST2 power management configuration module
#	Additionally this start script loads all needed modules
#       for cpufrequency scaling and acpi support

### END INIT INFO

# Check for missing binaries (stale symlinks should not happen)
powersaved_BIN=/usr/sbin/powersaved
powersave_BIN=/usr/local/bin/powersave
ACPID_BIN=/sbin/acpid
S2RAM_BIN=/usr/sbin/s2ram
# this is the default set of acpi modules loaded if nothing is configured
DEFAULT_ACPI_MODULES="ac battery button fan processor thermal"

test -x $powersaved_BIN || exit 5
# Check for existence of needed config file and read it

CONFIG=/usr/local/etc/powersave

# create symlink to /etc where powersave expects configuration files.
# this is an evil hack and is only needed when updating from powersave
# version 0.10.20 but does not hurt
ln -ns /etc/sysconfig/powersave $CONFIG >/dev/null 2>&1

test -r $CONFIG || exit 6
. $CONFIG/common
. $CONFIG/cpufreq
. $CONFIG/thermal
if test -e /etc/sysconfig/security; then
 . /etc/sysconfig/security
fi

LOGGER="/bin/logger -t rcpowersaved"
# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_status -s     display "skipped" and exit with status 3
#      rc_status -u     display "unused" and exit with status 3
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
#      rc_active	checks whether a service is activated by symlinks
#      rc_splash arg    sets the boot splash screen to arg (if active)
. /etc/rc.status

# Reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0	  - success
# 1       - generic or unspecified error
# 2       - invalid or excess argument(s)
# 3       - unimplemented feature (e.g. "reload")
# 4       - user had insufficient privileges
# 5       - program is not installed
# 6       - program is not configured
# 7       - program is not running
# 8--199  - reserved (8--99 LSB, 100--149 distrib, 150--199 appl)
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signaling is not supported) are
# considered a success.

OPTS=""
SYSFS_PATH="/sys/devices/system/cpu/cpu0/cpufreq"

function load_governors()
{
    if [ ! -r $SYSFS_PATH ];then
	$LOGGER Cannot load cpufreq governors - No cpufreq driver available
	return 1
    fi
    read govs < $SYSFS_PATH/scaling_available_governors
    case "$govs" in
	*powersave*) 
	    ;;
	*) 
	    modprobe -q cpufreq_powersave >/dev/null 2>&1
	    [ $? != 0 ] && $LOGGER powersave cpufreq governor could not be loaded
	    ;;
    esac
    case "$govs" in
	*performance*) 
	    ;;
	*) 
	    modprobe -q cpufreq_performance >/dev/null 2>&1
	    [ $? != 0 ] && $LOGGER perfromance cpufreq governor could not be loaded
	    ;;
    esac
    case "$govs" in
	*userspace*) 
	    ;;
	*) 
	    modprobe -q cpufreq_userspace >/dev/null 2>&1
	    [ $? != 0 ] && $LOGGER userspace cpufreq governor could not be loaded
	    ;;
    esac
    case "$govs" in
	*ondemand*)
	    ;;
	*) 
	    modprobe -q cpufreq_ondemand >/dev/null 2>&1
	    [ $? != 0 ] && $LOGGER ondemand cpufreq governor could not be loaded
	    ;;
    esac
    return 0
}

case "$1" in
        start)
		echo -n "Starting powersaved: "
		if [ "$POWERSAVED" = "off" -o "$POWERSAVE" = "off" ]; then
			echo -n "not starting (POWERSAVED=off)"
			$LOGGER "powersaved disabled due to POWERSAVED=off"
			rc_status -s
			rc_exit
		fi
		checkproc $powersaved_BIN
		if [ $? = 0 ]; then
		    echo -n "daemon already running"
		    rc_status -v
		    rc_exit
		elif [ -e /var/run/powersaved.pid ];then 
		    rm -f  /var/run/powersaved.pid&> /dev/null
		fi;

		ACPI_APM=`$powersave_BIN --apm-acpi`
		if [ "$ACPI_APM" = "ACPI" ]; then
	        # set thermal polling frequency
	        # this should be managed by the daemon later
		    if [ "$THERMAL_POLLING_FREQUENCY" != "0" ];then
			[ -z "$THERMAL_POLLING_FREQUENCY" ] && THERMAL_POLLING_FREQUENCY=2
			for x in /proc/acpi/thermal_zone/*; do
			    [ -w $x/polling_frequency ] && echo "$THERMAL_POLLING_FREQUENCY" >$x/polling_frequency
			done
		    fi

		    ACPI_EVENT_FILE="/var/run/acpid.socket"

		    pidof $ACPID_BIN >/dev/null
		    ACPID_NOT_RUNNING=$?
		    if [ $ACPID_NOT_RUNNING = 1 ];then
			$LOGGER "WARN: Service powersaved skipped. You have to start acpid before powersaved"
			echo -n "###############################################
# ACPI system but acpid not running.          #
# Start acpid first, then restart powersaved! #
###############################################"
			rc_status -s
			rc_exit
		    fi
		elif [ "$ACPI_APM" = "APM" ]; then
		    echo -n "This machine supports APM "
		fi 

		CPUFREQ_MODULES="speedstep_centrino powernow_k8 powernow_k7 powernow_k6 longrun acpi speedstep_ich"
		CPUFREQ_MODULES_GREP="^speedstep_centrino\|^speedstep_ich\|^powernow_k8\|^powernow_k7\|^powernow_k6\|^longrun\|^longhaul\|^acpi"

		###### load CPUFREQ modules############
		# module specfied in sysconfig.cpufreq?
		# if the drivers are compiled in, $SYSFS_PATH already exists
		if [ "$CPUFREQ_ENABLED" != "no" ] && [ ! -d $SYSFS_PATH ]; then
			# test for already loaded modules
			ALREADY_LOADED_MODS=`grep $CPUFREQ_MODULES_GREP /proc/modules`
			if [ "$CPUFREQD_MODULE" ]; then
				modprobe -q $CPUFREQD_MODULE $CPUFREQD_MODULE_OPTS &>/dev/null
				RETVAL=$?
			# try to load one of the modules we know
			elif [ -z "$ALREADY_LOADED_MODS" ] ; then 
				for MODULE in $CPUFREQ_MODULES; do
					modprobe $MODULE &>/dev/null
					RETVAL=$?
					[ "$RETVAL" = 0 ] && break
				done
				# skip if no module could be loaded!
				if [ "$RETVAL" != 0 ]; then
					$LOGGER "CPU frequency scaling is not supported by your processor."
					$LOGGER "enter 'CPUFREQ_ENABLED=no' in $CONFIG/cpufreq to avoid this warning."
					# remove eventually loaded modules, bug 150381
					rmmod speedstep_lib freq_table 2>/dev/null
				else
					$LOGGER "enter '$MODULE' into CPUFREQD_MODULE in $CONFIG/cpufreq."
					$LOGGER "this will speed up starting powersaved and avoid unnecessary warnings in syslog."
				fi
			fi
		fi

		[ "$CPUFREQ_ENABLED" != "no" ] && load_governors
		###### load CPUFREQ modules############

                #### is s2ram installed? If yes, use it to determine suspend to ram capability
                if [ -x "$S2RAM_BIN" ]; then
                    . $CONFIG/sleep
                    if [ "$SUSPEND2RAM_FORCE" != yes ]; then
                        $S2RAM_BIN -n > /dev/null 2>&1
                        RET=$?
                        if [ $RET -eq 0 ]; then
                            $LOGGER "s2ram identified your machine as being capable of suspend to RAM. See 's2ram -n' for details."
                        else
                            $LOGGER "s2ram does not know your machine. See 's2ram -i' for details. ($RET)"
                            $LOGGER "Use SUSPEND2RAM_FORCE=yes to override this detection."
                        fi
                    else
                        $LOGGER "SUSPEND2RAM_FORCE is set to yes."
                    fi
                else
                    $LOGGER "s2ram not installed."
                fi
		OPTS="$OPTS -v ${DEBUG:-3}"
		startproc -e $powersaved_BIN -d ${ACPI_EVENT_FILE:+-f "$ACPI_EVENT_FILE"} $OPTS
		rc_status -v
		;;
	stop)   
		echo -n "Shutting down powersaved "
		killproc -TERM $powersaved_BIN
		rc_status -v
		;;
	try-restart)
	        $0 status
		if test $? = 0; then
			$0 restart
		else
			rc_reset        # Not running is not a failure.
		fi
		rc_status
		;;
	restart)
		$0 stop
		$0 start
		rc_status
		;;
	force-reload|reload)
		echo -n "Reload service powersaved "
		killproc -HUP $powersaved_BIN
		rc_status -v
		;;
	status)
		echo -n "Checking for service powersaved "
		checkproc $powersaved_BIN
		rc_status -v
		;;
	*)
		echo "Usage: $0" \
		     "{start|stop|status|try-restart|restart|force-reload|reload}"
		exit 1
		;;
esac
rc_exit
