#! /bin/sh
# 
# Laptop mode tools module: power saving for IPW3945, IPW2200 and IPW2100 using
#                           the Intel ipw drivers.
#
#
# This script relies upon the name of the driver.
#
# Original source: http://ubuntuforums.org/showthread.php?t=419772

if [ x$CONTROL_IPW_POWER = x1 ] ; then

	# Provide defaults for config file settings
	[ "$IPW3945_AC_POWER" ]   || IPW3945_AC_POWER=6
	[ "$IPW3945_BATT_POWER" ] || IPW3945_BATT_POWER=7
	[ "$IPW2100_AC_POWER" ]   || IPW3945_AC_POWER=0
	[ "$IPW2100_BATT_POWER" ] || IPW3945_BATT_POWER=5

	I3945_DRIVERNAME=ipw3945
	I2200_DRIVERNAME=ipw2200
	I2100_DRIVERNAME=ipw2100

	# find executables
	if [ -x /sbin/iwpriv ] ; then
		IWPRIV=/sbin/iwpriv
	elif [ -x /usr/sbin/iwpriv ] ; then
		IWPRIV=/usr/sbin/iwpriv
	else
		log "VERBOSE" "iwpriv is not installed"
	fi
	if [ -x /sbin/iwconfig ] ; then
		IWCONFIG=/sbin/iwconfig
	elif [ -x /usr/sbin/iwconfig ] ; then
		IWCONFIG=/usr/sbin/iwconfig
	else
		log "VERBOSE" "iwconfig is not installed"
	fi

	SET_I3945_AC_PARMS="set_power $IPW3945_AC_POWER"
	SET_I3945_BAT_PARMS="set_power $IPW3945_BATT_POWER"

	SET_I2200_AC_PARMS="power off"
	SET_I2200_BAT_PARMS="power on"

	# Note the fact that we're setting "power on" on both AC and battery.
	# This is due to the fact that the second statement will have no effect
	# if we turn power management off completely, and some laptops will
	# reportedly get very hot if you turn off power management on the
	# IPW2100.
	SET_I2100_AC_PARMS_1="power on"
	SET_I2100_BAT_PARMS_1="power on"
	SET_I2100_AC_PARMS_2="set_power $IPW2100_AC_POWER"
	SET_I2100_BAT_PARMS_2="set_power $IPW2100_BATT_POWER"


	#
	# Find all the wireless devices using the supplied driver names.
	# Place the interface names on the list WIFI_IFNAMES.
	#
	findWifiIfsByDriver() {
		local DEVICE;
		local LINK_TARGET;
                local ENABLED;
		WIFI_IFNAMES=""

		for DEVICE in /sys/class/net/*; do
			if [ -d $DEVICE/wireless -a -h $DEVICE/device/driver ]; then
				# See if the driver for $DEVICE matches the supplied one by checking the link to
				# the driver.
				LINK_TARGET=`readlink $DEVICE/device/driver`
				LINK_TARGET=${LINK_TARGET##*/}
                                ENABLED=`cat $DEVICE/device/enable`

				if [ $ENABLED -eq 1 -a "$LINK_TARGET" = "$1" ]; then
					# add the interface name to the list
		    		        WIFI_IFNAMES="$WIFI_IFNAMES ${DEVICE##*/}"
                                else
                                        log "VERBOSE" "$DEVICE doesn't seem to be enabled. Radio Switched off?";
				fi
                        else
                                # LP: #369113
                                # Kernel's 2.6.29 and above have been reported to be missing
                                # the $DEVICE/wireless folder.
                                dev=`basename $DEVICE`
                                $IWCONFIG $dev >/dev/null 2>&1;
                                ret=$?;
                                if [ "$ret" = "0" ]; then
					# add the interface name to the list
		    		        WIFI_IFNAMES="$WIFI_IFNAMES ${DEVICE##*/}"
                                fi
			fi
		done
	}


	#
	# Set all the adaptors using the supplied driver into the supplied
	# power saving mode
	#
	# $1 - driver name
	# $2 - power command
	# $3 - power command arguments
	#
	setWifiPwrSave () {
		local DEVICE;
		findWifiIfsByDriver $1;

		for DEVICE in $WIFI_IFNAMES; do
			log "VERBOSE" "Wireless power saving: $2 $DEVICE $3"
			$2 $DEVICE $3
		done
	}

	intel3945_BatPwrSave () {
		setWifiPwrSave "$I3945_DRIVERNAME" "$IWPRIV" "$SET_I3945_BAT_PARMS"
	}

	intel3945_AcPwrSave () {
		setWifiPwrSave "$I3945_DRIVERNAME" "$IWPRIV" "$SET_I3945_AC_PARMS"
	}

	intel2200_BatPwrSave () {
		setWifiPwrSave "$I2200_DRIVERNAME" "$IWCONFIG" "$SET_I2200_BAT_PARMS"
	}

	intel2200_AcPwrSave () {
		setWifiPwrSave "$I2200_DRIVERNAME" "$IWCONFIG" "$SET_I2200_AC_PARMS"
	}

	intel2100_BatPwrSave () {
		setWifiPwrSave "$I2100_DRIVERNAME" "$IWCONFIG" "$SET_I2100_BAT_PARMS_1"
		setWifiPwrSave "$I2100_DRIVERNAME" "$IWPRIV" "$SET_I2100_BAT_PARMS_2"
	}

	intel2100_AcPwrSave () {
		setWifiPwrSave "$I2100_DRIVERNAME" "$IWCONFIG" "$SET_I2100_AC_PARMS_1"
		setWifiPwrSave "$I2100_DRIVERNAME" "$IWPRIV" "$SET_I2100_BAT_PARMS_2"
	}


	if [ $ON_AC -eq 1 ] ; then
		[ -d /sys/module/$I3945_DRIVERNAME ] && intel3945_AcPwrSave
		[ -d /sys/module/$I2200_DRIVERNAME ] && intel2200_AcPwrSave
		[ -d /sys/module/$I2100_DRIVERNAME ] && intel2100_AcPwrSave
	else
		[ -d /sys/module/$I3945_DRIVERNAME ] && intel3945_BatPwrSave
		[ -d /sys/module/$I2200_DRIVERNAME ] && intel2200_BatPwrSave
		[ -d /sys/module/$I2100_DRIVERNAME ] && intel2100_BatPwrSave
	fi
else
	log "VERBOSE" "Intel IPW Wireless power setting is disabled."
fi