pwmconfig

#!/bin/bash
#
# pwmconfig
# Tests the pwm outputs of sensors and configures fancontrol
# Supported Linux kernel versions: 2.6.5 and later
#
#    Warning!!! This program will stop your fans, one at a time,
#    for approximately 5 seconds each!!!
#    This may cause your processor temperature to rise!!!
#    Verify that all fans are running at normal speed after this
#    program has exited!!!
#
#    Copyright (C) 2007-2009 Jean Delvare <khali@linux-fr.org>
#
#    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 your 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 Street, Fifth Floor, Boston,
#    MA 02110-1301 USA.
#
#

REVISION=$(echo '$Revision: 6166 $' | cut -d' ' -f2)
REVDATE=$(echo '$Date: 2013-05-01 13:37:47 +0200 (mer. 01 mai 2013) $' | cut -d' ' -f2)
PIDFILE="/var/run/fancontrol.pid"

if [ -f "$PIDFILE" ]
then
	echo "File $PIDFILE exists. This typically means that the"
	echo "fancontrol deamon is running. You should stop it before running pwmconfig."
	echo "If you are certain that fancontrol is not running, then you can delete"
	echo "$PIDFILE manually."
	exit 1
fi

if [ "`id -u`" != "0" ]
then
	echo "You need to be root to run this script."
	exit 1
fi

echo "# pwmconfig revision $REVISION ($REVDATE)"
echo 'This program will search your sensors for pulse width modulation (pwm)'
echo 'controls, and test each one to see if it controls a fan on'
echo 'your motherboard. Note that many motherboards do not have pwm'
echo 'circuitry installed, even if your sensor chip supports pwm.'
echo
echo 'We will attempt to briefly stop each fan using the pwm controls.'
echo 'The program will attempt to restore each fan to full speed'
echo 'after testing. However, it is ** very important ** that you'
echo 'physically verify that the fans have been to full speed'
echo 'after the program has completed.'
echo

DELAY=5 # 3 seconds delay is too short for large fans, thus I increased it to 5
MAX=255

if [ -d "/sys/class/hwmon" ]
then
	SYSFS=2
	DIR="/sys/class/hwmon"
	PREFIX='hwmon*'
elif [ -d "/sys/bus/i2c/devices" ]
then
	SYSFS=1
	DIR="/sys/bus/i2c/devices"
	PREFIX='*-*'
else
	echo $0: 'No sensors found! (modprobe sensor modules?)'
	exit 1
fi

cd $DIR
DEVICES=`echo $PREFIX`
if [ "$PREFIX" = "$DEVICES" ]
then
	echo $0: 'No sensors found! (modprobe sensor modules?)'
	exit 1
fi

# We may need to adjust the device path
if [ "$SYSFS" = "2" ]
then
	OLD_DEVICES="$DEVICES"
	DEVICES=""

	for device in $OLD_DEVICES
	do
		if [ ! -r "$device/name" ]
		then
			device="$device/device"
		fi
		
		DEVICES="$DEVICES $device"
	done
fi


for device in $DEVICES
do
	# Find available fan control outputs
	MATCH=$device/'pwm[1-9]'
	device_pwm=`echo $MATCH`
	if [ "$SYSFS" = "1" -a "$MATCH" = "$device_pwm" ]
	then
		# Deprecated naming scheme (used in kernels 2.6.5 to 2.6.9)
		MATCH=$device/'fan[1-9]_pwm'
		device_pwm=`echo $MATCH`
	fi
	if [ "$MATCH" != "$device_pwm" ]
	then
		PWM="$PWM $device_pwm"
	fi

	# Find available fan monitoring inputs
	MATCH=$device/'fan[1-9]_input'
	device_fan=`echo $MATCH`
	if [ "$MATCH" != "$device_fan" ]
	then
		FAN="$FAN $device_fan"
	fi
done

if [ -z "$PWM" ]
then
	echo $0: 'There are no pwm-capable sensor modules installed - no output'
	exit 1
fi
if [ -z "$FAN" ]
then
	echo $0: 'There are no fan-capable sensor modules installed - no input'
	exit 1
fi

# $1 = padding
function print_devices()
{
	local name device

	for device in $DEVICES
	do
		name=`cat $device/name 2> /dev/null`
		[ -z "$name" ] && name="unknown (no name attribute)"
		echo "$1$device is $name"
	done
}

# $1 = pwm file name
function is_pwm_auto()
{
	local ENABLE=${1}_enable

	if [ -f $ENABLE ]
	then
		if [ "`cat $ENABLE`" -gt 1 ]
		then
			return 0
		fi
	fi

	return 1
}

# $1 = pwm file name
function pwmdisable()
{
	local ENABLE=${1}_enable

	# No enable file? Just set to max
	if [ ! -f $ENABLE ]
	then
		echo $MAX > $1
		return 0
	fi

	# Try pwmN_enable=0
	echo 0 2>/dev/null > $ENABLE
	if [ "`cat $ENABLE`" -eq 0 ]
	then
		# Success
		return 0
	fi

	# It didn't work, try pwmN_enable=1 pwmN=255
	echo 1 2>/dev/null > $ENABLE
	if [ "`cat $ENABLE`" -ne 1 ]
	then
		echo "$ENABLE stuck to `cat $ENABLE`" >&2
		return 1
	fi

	echo $MAX > $1
	if [ "`cat $1`" -ge 190 ]
	then
		# Success
		return 0
	fi

	# Nothing worked
	echo "$1 stuck to `cat $1`" >&2
	return 1
}

# $1 = pwm file name
function pwmenable()
{
	local ENABLE=${1}_enable

	if [ -w $ENABLE ]
	then
		echo 1 2>/dev/null > $ENABLE
		if [ $? -ne 0 ]
		then
			return 1
		fi
	fi
	echo $MAX > $1
}

# $1 = pwm file name; $2 = pwm value 0-255
function pwmset()
{
	echo $2 > $1
}

echo 'Found the following devices:'
print_devices "   "
echo

echo 'Found the following PWM controls:'
for i in $PWM
do
	P=`cat $i`
	echo "   $i           current value: $P"
	if [ -w $i ]
	then
		# First check if PWM output is in automatic mode
		if is_pwm_auto $i
		then
			echo "$i is currently setup for automatic speed control."
			echo 'In general, automatic mode is preferred over manual mode, as'
			echo 'it is more efficient and it reacts faster. Are you sure that'
			echo -n 'you want to setup this output for manual control? (n) '
			read X
			if [ "$X" = "" -o "$X" != "y" -a "$X" != "Y" ]
			then
				continue
			fi
		fi

		pwmdisable $i
		if [ $? -ne 0 ]
		then
			echo "Manual control mode not supported, skipping $i."
		elif [ "$GOODPWM" = "" ]
		then
			GOODPWM=$i
		else
			GOODPWM="$GOODPWM $i"
		fi
	else
		echo "Can't write to $i, skipping."
	fi
done

if [ "$GOODPWM" = "" ]
then
	echo 'There are no usable PWM outputs.'
	exit 1
fi

echo
echo "Giving the fans some time to reach full speed..."
sleep $DELAY
echo 'Found the following fan sensors:'
for i in $FAN
do
	S=`cat $i`
	if [ "$S" = "0" -o "$S" = "-1" ]
	then
		echo "   $i     current speed: 0 ... skipping!"
	else
		echo "   $i     current speed: $S RPM"
		if [ "$GOODFAN" = "" ]
		then
			GOODFAN=$i
			SPEEDS=$S
		else
			GOODFAN="$GOODFAN $i"
			SPEEDS="$SPEEDS $S"
		fi
	fi
done
echo

if [ "$GOODFAN" = "" ]
then
	echo 'There are no working fan sensors, all readings are 0.'
	echo 'Make sure you have a 3-wire fan connected.'
	echo 'You may also need to increase the fan divisors.'
	echo 'See doc/fan-divisors for more information.'
	exit 1
fi

echo 'Warning!!! This program will stop your fans, one at a time,'
echo "for approximately $DELAY seconds each!!!"
echo 'This may cause your processor temperature to rise!!!'
echo 'If you do not want to do this hit control-C now!!!'
echo -n 'Hit return to continue: '
read X
echo

PLOTTER=gnuplot
STEP=15
PDELAY=2
# Use a smaller step for low PWM values as this is typically where the
# more important fan speed changes are happening.
STEP2=2
STEP2_BELOW=31

function pwmdetail()
{
	local P=$1 F=$2
	local X PLOT= TMP1 TMP2
	local threshold=100000 pwm S

	type $PLOTTER > /dev/null 2>&1
	if [ $? -eq 0 ]
	then
		echo -n "Would you like to generate a graphical plot using $PLOTTER (y)? "
		read X
		if [ "$X" = "y" -o "$X" = "Y" -o "$X" = "" ]
		then
			PLOT=y
		fi
	else
		if [ -n "$DISPLAY" ]
		then
			echo "Note: If you had $PLOTTER installed, I could generate a graphical plot."
		fi
	fi

	if [ "$PLOT" = "y" ]
	then
		TMP1=`mktemp -t pwmtest1.XXXXXXXXXX` || { echo "$0: Cannot create temporary file" >&2; exit 1; }
		TMP2=`mktemp -t pwmtest2.XXXXXXXXXX` || { rm -f $TMP1 ; echo "$0: Cannot create temporary file" >&2; exit 1; }
		echo "set xlabel \"PWM: $P\"" > $TMP1
		echo "set ylabel \"FAN: $F (RPM)\"" >> $TMP1
		echo 'set nokey' >> $TMP1
		echo 'set xrange [0:255]' >> $TMP1
		echo "plot \"$TMP2\" with lines" >> $TMP1
		echo 'pause -1 "    Hit return to continue..."' >> $TMP1
		> $TMP2
	fi

	let pwm=$MAX
	pwmenable $P
	while [ $pwm -ge 0 ]
	do
		pwmset $P $pwm
		sleep $PDELAY
		if [ $? -ne 0 ]
		then
			pwmdisable $P
			echo '^C received, aborting...'
			rm -f $TMP1 $TMP2
			exit 1
		fi
		S=`cat $F`
		# Fan speed should never increase significantly
		if [ $S -gt $threshold ]
		then
			echo "    PWM $pwm FAN $S (probably incorrect)"
		else
			echo "    PWM $pwm FAN $S"
			let threshold=S*6/5
		fi

		if [ "$PLOT" = "y" ]
		then
			echo "$pwm $S" >> $TMP2
		fi
		if [ "$S" = "0" -o "$S" = "-1" ]
		then
			pwmdisable $P
			echo "    Fan Stopped at PWM = $pwm"
			if [ $pwm -eq $MAX ]
			then
				echo "    This fan appears to stop when the PWM is enabled;"
				echo "    perhaps the fan input shares a pin with the PWM output"
				echo "    on the sensor chip."
				echo "    You cannot control this fan with this PWM output."
				rm -f $TMP1 $TMP2
				echo
				return 0
			fi
			break
		fi
		if [ $pwm -lt $STEP2_BELOW ]
		then
			let pwm=$pwm-$STEP2
		else
			let pwm=$pwm-$STEP
		fi
	done
	pwmdisable $P
	if [ "$PLOT" = "y" ]
	then
		$PLOTTER  $TMP1
		rm -f $TMP1 $TMP2
	fi
	echo
}

for i in $GOODPWM
do
	echo Testing pwm control $i ...
	pwmenable $i
	if [ $? -ne 0 ]
	then
		echo "Manual control mode not supported, skipping."
		continue
	fi
	pwmset $i 0
	sleep $DELAY
	if [ $? -ne 0 ]
	then
		pwmdisable $i
		echo '^C received, restoring PWM and aborting...'
		exit 1
	fi

	# Sample all current fan speeds at once, so that we can quickly
	# disable PWM and return all fans to full speed
	CURRENT_SPEEDS="`cat $GOODFAN`"
	pwmdisable $i

	let pwmactivecount=0
	let count=1
	S_MIN=
	for j in $GOODFAN
	do
		OS=`echo $SPEEDS | cut -d' ' -f$count`
		S=`echo $CURRENT_SPEEDS | cut -d' ' -f$count`
		echo "  $j ... speed was $OS now $S"
		let threshold=3*$OS/4
		if [ $S -lt $threshold ]
		then
			echo "    It appears that fan $j"
			echo "    is controlled by pwm $i"
#
# a PWM can control more than one fan....
#
			if [ $pwmactivecount -eq 0 ]
			then
				let pwmactivecount=1
				pwmactive="$i ${pwmactive}"
				fanactive="$j ${fanactive}"

				# Give all correlated fans time to return to full speed
				sleep $DELAY
				if [ $? -ne 0 ]
				then
					echo '^C received, aborting...'
					exit 1
				fi
			else
				fanactive="$j+${fanactive}"
			fi

			# Keep track of the slowest fan controlled by one PWM
			if [ -z "$S_MIN" ] || [ $S -lt $S_MIN ]
			then
				S_MIN=$S
			fi

			S=`cat $j`
			if [ $S -lt $threshold ]
			then
				echo "    Fan $j has not returned to speed, please investigate!"
			else
				echo -n "Would you like to generate a detailed correlation (y)? "
				read X
				if [ "$X" = "y" -o "$X" = "Y" -o "$X" = "" ]
				then
					pwmdetail $i $j
				fi
			fi
		else
			echo "    no correlation"
		fi
		let count=count+1
	done
	echo
	if [ "$pwmactivecount" = "0" ]
	then
		echo "No correlations were detected."
		echo "There is either no fan connected to the output of $i,"
		echo "or the connected fan has no rpm-signal connected to one of"
		echo "the tested fan sensors. (Note: not all motherboards have"
		echo "the pwm outputs connected to the fan connectors,"
		echo "check out the hardware database on http://www.almico.com/forumindex.php)"
		echo
		echo -n "Did you see/hear a fan stopping during the above test (n)? "
		read X
		if [ "$X" = "y" -o "$X" = "Y" ]
		then
			pwmactive="$i ${pwmactive}"
			fanactive_min="0 $fanactive_min"
		fi
		echo
	else
		fanactive_min="$S_MIN $fanactive_min"
	fi
done


echo 'Testing is complete.'
echo 'Please verify that all fans have returned to their normal speed.'
echo
echo 'The fancontrol script can automatically respond to temperature changes'
echo 'of your system by changing fanspeeds.'
echo -n 'Do you want to set up its configuration file now (y)? '

read X
if [ "$X" = "n" -o "$X" = "N" ]
then
	exit
fi

for device in $DEVICES
do
	# Find available temperature monitoring inputs
	MATCH=$device/'temp[1-9]_input'
	device_temp=`echo $MATCH`
	if [ "$MATCH" != "$device_temp" ]
	then
		TEMPS="$TEMPS $device_temp"
	fi
done

if [ -z "$TEMPS" ]
then
	echo $0: 'There are no temperature-capable sensor modules installed'
	exit 1
fi

function DevicePath()
{
	if [ -h "$1/device" ]
	then
		readlink -f "$1/device" | sed -e 's/^\/sys\///'
	fi
}

function DeviceName()
{
	if [ -r "$1/name" ]
	then
		cat "$1/name" | sed -e 's/[[:space:]=]/_/g'
	elif [ -r "$1/device/name" ]
	then
		cat "$1/device/name" | sed -e 's/[[:space:]=]/_/g'
	fi
}

function ValidateDevices()
{
	local OLD_DEVPATH="$1" OLD_DEVNAME="$2" outdated=0
	local entry device name path

	for entry in $OLD_DEVPATH
	do
		device=`echo "$entry" | sed -e 's/=[^=]*$//'`
		path=`echo "$entry" | sed -e 's/^[^=]*=//'`

		if [ "`DevicePath "$device"`" != "$path" ]
		then
			echo "Device path of $device has changed"
			outdated=1
		fi
	done

	for entry in $OLD_DEVNAME
	do
		device=`echo "$entry" | sed -e 's/=[^=]*$//'`
		name=`echo "$entry" | sed -e 's/^[^=]*=//'`

		if [ "`DeviceName "$device"`" != "$name" ]
		then
			echo "Device name of $device has changed"
			outdated=1
		fi
	done

	return $outdated
}

function AskPath()
{
	echo -n 'What should be the path to your fancontrol config file (/etc/fancontrol)? '

	read FCCONFIG
	if [ "$FCCONFIG" = "" ]
	then
		FCCONFIG="/etc/fancontrol"
	fi
}

AskPath

function ClearConfig()
{
	FCTEMPS=""
	FCFANS=""
	MINTEMP=""
	MAXTEMP=""
	MINSTART=""
	MINSTOP=""
	MINPWM=""
	MAXPWM=""
	SMOOTHING=""
	THYST=""
}

function LoadConfig()
{
	local OLD_DEVPATH OLD_DEVNAME

	# Nothing to do
	if [ ! -f "$1" ]
	then
		ClearConfig
		return 0
	fi

	echo "Loading configuration from $1 ..."
	INTERVAL=`egrep '^INTERVAL=.*$' $1 | sed -e 's/INTERVAL= *//g'`
	OLD_DEVPATH=`egrep '^DEVPATH=.*$' $1 | sed -e 's/DEVPATH= *//g'`
	OLD_DEVNAME=`egrep '^DEVNAME=.*$' $1 | sed -e 's/DEVNAME= *//g'`
	FCTEMPS=`egrep '^FCTEMPS=.*$' $1 | sed -e 's/FCTEMPS= *//g'`
	FCFANS=`egrep '^FCFANS=.*$' $1 | sed -e 's/FCFANS= *//g'`
	MINTEMP=`egrep '^MINTEMP=.*$' $1 | sed -e 's/MINTEMP= *//g'`
	MAXTEMP=`egrep '^MAXTEMP=.*$' $1 | sed -e 's/MAXTEMP= *//g'`
	MINSTART=`egrep '^MINSTART=.*$' $1 | sed -e 's/MINSTART= *//g'`
	MINSTOP=`egrep '^MINSTOP=.*$' $1 | sed -e 's/MINSTOP= *//g'`
	MINPWM=`egrep '^MINPWM=.*$' $1 | sed -e 's/MINPWM= *//g'`
	MAXPWM=`egrep '^MAXPWM=.*$' $1 | sed -e 's/MAXPWM= *//g'`
	THYST=`egrep '^THYST=.*$' $1 | sed -e 's/THYST= *//g'`
	SMOOTHING=`egrep '^SMOOTHING=.*$' $1 | sed -e 's/SMOOTHING= *//g'`

	# Check for configuration change
	if ! ValidateDevices "$OLD_DEVPATH" "$OLD_DEVNAME"
	then
		echo "Configuration appears to be outdated, discarded"
		ClearConfig
		return 0
	fi
}

LoadConfig $FCCONFIG

# $1 = pwm value below which the fan is stopped
function TestMinStart()
{
	local fanok FANTEST

	echo
	echo 'Now we increase the PWM value in 10-unit-steps.'
	echo 'Let the fan stop completely, then press return until the'
	echo "fan starts spinning. Then enter 'y'."
	echo 'We will use this value +20 as the starting speed.'
	let fanok=0
	let fanval="$1"

	pwmenable $pwms
	until [ "$fanok" = "1" ]
	do
		if [ $fanval -gt 240 ] ; then let fanval=$MAX ; let fanok=1 ; fi
		echo -n "Setting $pwms to $fanval..."
		pwmset $pwms $fanval
		read FANTEST
		if [ "$FANTEST" != "" ] ; then let fanok=1 ; fi
		let fanval=fanval+10
	done
	pwmdisable $pwms

	let fanval=fanval+20
	if [ $fanval -gt 240 ] ; then let fanval=$MAX ; fi
	echo "OK, using $fanval"
}

# $1 = fan input to read the fan speed from
function TestMinStop()
{
	local faninput=$1
	local threshold=100000
	local fanspeed

	echo
	echo 'Now we decrease the PWM value to figure out the lowest usable value.'
	echo 'We will use a slightly greater value as the minimum speed.'
	let fanval=$MAX

	pwmenable $pwms
	while [ $fanval -ge 0 ]
	do
		pwmset $pwms $fanval
		sleep $PDELAY
		fanspeed=`cat $faninput`
		if [ $fanspeed -gt $threshold ]
		then
			echo "    PWM $fanval -> $fanspeed RPM (probably incorrect)"
			break
		else
			echo "    PWM $fanval -> $fanspeed RPM"
			if [ $fanspeed = "0" -o $fanspeed = "-1" ]
			then
				break
			fi
			let threshold=fanspeed*6/5
		fi
		if [ $fanval -lt $STEP2_BELOW ]
		then
			let fanval=$fanval-$STEP2
		else
			let fanval=$fanval-$STEP
		fi
	done
	pwmdisable $pwms

	if [ $fanval -lt $STEP2_BELOW ]
	then
		let 'fanval=fanval+2*STEP2'
	else
		let 'fanval=fanval+STEP'
	fi
	echo "OK, using $fanval"
}

# Remember the path and name of each device with at least one
# reference (pwm, temp or fan) in the configuration file.
# This function sets globals DEVPATH and DEVNAME as a side effect.
function RememberDevices()
{
	local used entry device name path tempfandev pwmdev
	DEVPATH=""
	DEVNAME=""

	for device in $DEVICES
	do
		device=`echo "$device" | sed -e 's/\/.*$//'`

		used=0
		for entry in $1 $2
		do
			pwmdev=`echo "$entry" | sed -e 's/\/.*$//'`
			tempfandev=`echo "$entry" | sed -e 's/^[^=]*=//' -e 's/\/.*$//'`

			if [ "$device" = "$pwmdev" -o "$device" = "$tempfandev" ]
			then
				used=1
			fi
		done
		if [ "$used" -eq 0 ]
		then
			continue
		fi

		# Record the device path and name. This lets the fancontrol
		# script check that they didn't change. If they did, then the
		# configuration file can no longer be trusted.
		path=`DevicePath "$device"`
		if [ -z "$DEVPATH" ]
		then
			DEVPATH="$device=$path"
		else
			DEVPATH="$DEVPATH $device=$path"
		fi

		name=`DeviceName "$device"`
		if [ -z "$DEVNAME" ]
		then
			DEVNAME="$device=$name"
		else
			DEVNAME="$DEVNAME $device=$name"
		fi
	done
}

function SaveConfig()
{
	local tmpfile

	RememberDevices "$FCTEMPS" "$FCFANS"

	echo
	echo "Saving configuration to $FCCONFIG..."
	tmpfile=`mktemp -t pwmcfg.XXXXXXXXXX` || { echo "$0: Cannot create temporary file" >&2; exit 1;  }
	trap " [ -f \"$tmpfile\" ] && /bin/rm -f -- \"$tmpfile\"" 0 1 2 3 13 15
	echo "# Configuration file generated by pwmconfig, changes will be lost" >$tmpfile
	echo "INTERVAL=$INTERVAL" >>$tmpfile
	echo "DEVPATH=$DEVPATH" >>$tmpfile
	echo "DEVNAME=$DEVNAME" >>$tmpfile
	echo "FCTEMPS=$FCTEMPS" >>$tmpfile
	echo "FCFANS=$FCFANS" >>$tmpfile
	echo "MINTEMP=$MINTEMP" >>$tmpfile
	echo "MAXTEMP=$MAXTEMP" >>$tmpfile
	echo "MINSTART=$MINSTART" >>$tmpfile
	echo "MINSTOP=$MINSTOP" >>$tmpfile
	[ -n "$MINPWM" ] && echo "MINPWM=$MINPWM" >>$tmpfile
	[ -n "$MAXPWM" ] && echo "MAXPWM=$MAXPWM" >>$tmpfile
	[ -n "$SMOOTHING" ] && echo "SMOOTHING=$SMOOTHING" >>$tmpfile
	[ -n "$THYST" ] && echo "THYST=$THYST" >>$tmpfile
	mv $tmpfile $FCCONFIG
	chmod +r $FCCONFIG
	#check if file was written correctly
	echo 'Configuration saved'
}

INTERVAL=10
PS3='select (1-n): '
DEFMINTEMP=20
DEFMAXTEMP=60
DEFMINSTART=150
DEFMINSTOP=100

function filter_cfgvar()
{
	echo "$1" | sed -e 's/ /\n/g' \
		  | egrep "$2" \
		  | sed -e 's/.*=//g'
}

# "select" won't repeat the list of options, so we enclose it in a
# never-ending loop so that it starts over again with each iteration.
# I admit it's not exactly nice, but I do not have a better idea to
# keep usability at an acceptable level.
while [ 1 ] ; do
echo
echo 'Select fan output to configure, or other action:'
select pwms in $pwmactive "Change INTERVAL" "Just quit" "Save and quit" "Show configuration"; do
	case $pwms in
	"Change INTERVAL")
		echo
		echo "Current interval is $INTERVAL seconds."
		echo -n "Enter the interval at which fancontrol should update PWM values (in s): "
		read INTERVAL #check user input here
		break ;;
	"Just quit")
		exit ;;
	"Save and quit")
		SaveConfig
		exit ;;
	"Show configuration")
		echo
		echo "Common Settings:"
		echo "INTERVAL=$INTERVAL"
		for pwmo in $pwmactive
		do
			echo
			echo "Settings of ${pwmo}:"
			echo "  Depends on `filter_cfgvar "$FCTEMPS" "$pwmo"`"
			echo "  Controls `filter_cfgvar "$FCFANS" "$pwmo"`"
			echo "  MINTEMP=`filter_cfgvar "$MINTEMP" $pwmo`"
			echo "  MAXTEMP=`filter_cfgvar "$MAXTEMP" "$pwmo"`"
			echo "  MINSTART=`filter_cfgvar "$MINSTART" "$pwmo"`"
			echo "  MINSTOP=`filter_cfgvar "$MINSTOP" "$pwmo"`"
			XMINP=`filter_cfgvar "$MINPWM" "$pwmo"`
			[ -n "$XMINP" ] && echo "  MINPWM=$XMINP"
			XMAXP=`filter_cfgvar "$MAXPWM" "$pwmo"`
			[ -n "$XMAXP" ] && echo "  MAXPWM=$XMAXP"
			XSMOP=`filter_cfgvar "$SMOOTHING" "$pwmo"`
			[ -n "$XSMOP" ] && echo "  SMOOTHING=$XSMOP"
			XTHYP=`filter_cfgvar "$THYST" "$pwmo"`
			[ -n "$XTHYP" ] && echo "  THYST=$XTHYP"
		done
		echo
		break ;;

	"`echo ${pwmactive} |sed -e 's/ /\n/g' | egrep "${pwms}"`" )
		pwmsed=`echo ${pwms} | sed -e 's/\//\\\\\//g'` #escape / for sed
		echo

		echo 'Devices:'
		print_devices ""
		echo

		echo 'Current temperature readings are as follows:'
		for j in $TEMPS
		do
			S=`cat $j`
			let S="$S / 1000"
			echo "$j	$S"
		done
		FAN=`echo $fanactive|cut -d' ' -f$REPLY`
		FAN_MIN=`echo $fanactive_min|cut -d' ' -f$REPLY`
	       	FCFANS="`echo $FCFANS | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=$FAN"
		echo
		echo "Select a temperature sensor as source for ${pwms}:"
		select tempss in $TEMPS "None (Do not affect this PWM output)"; do
			if [ "$tempss" = "None (Do not affect this PWM output)" ]
			then

				break;
			else
				if [ "$FCTEMPS" = "" ]
				then
					FCTEMPS="${pwms}=${tempss}"
				else
					FCTEMPS="`echo $FCTEMPS | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${tempss}"
				fi
			fi
			echo
			echo 'Enter the low temperature (degree C)'
			echo -n "below which the fan should spin at minimum speed ($DEFMINTEMP): "
			read XMT
			if [ "$XMT" = "" ]
			then
				XMT=$DEFMINTEMP
			fi
			if [ "$MINTEMP" = "" ]
			then
				MINTEMP="${pwms}=${XMT}"
			else
				MINTEMP="`echo $MINTEMP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMT}"
			fi
			echo
			echo 'Enter the high temperature (degree C)'
			echo -n "over which the fan should spin at maximum speed ($DEFMAXTEMP): "
			read XMT
			if [ "$XMT" = "" ]
			then
				XMT=$DEFMAXTEMP
			fi
			if [ "$MAXTEMP" = "" ]
			then
				MAXTEMP="${pwms}=${XMT}"
			else
				MAXTEMP="`echo $MAXTEMP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMT}"
			fi

			if [ $FAN_MIN -eq 0 ]
			then
				echo
				echo "Enter the minimum PWM value (0-$MAX)"
				echo -n "at which the fan STOPS spinning (press t to test) ($DEFMINSTOP): "
				read XMSTOP

				if [ "$XMSTOP" = "" ]
				then
					XMSTOP=$DEFMINSTOP
				fi
				if [ "$XMSTOP" = "t" -o "$XMSTOP" = "T" ]
				then
					TestMinStop $FAN
					XMSTOP=$fanval
				fi
			else
				XMSTOP=0
			fi
			if [ "$MINSTOP" = "" ]
			then
				MINSTOP="${pwms}=${XMSTOP}"
			else
				MINSTOP="`echo $MINSTOP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMSTOP}"
			fi

			if [ $FAN_MIN -eq 0 ]
			then
				echo
				echo "Enter the minimum PWM value ($XMSTOP-$MAX)"
				echo -n "at which the fan STARTS spinning (press t to test) ($DEFMINSTART): "
				read XMSTART

				if [ "$XMSTART" = "" ]
				then
					XMSTART=$DEFMINSTART
				fi
				if [ "$XMSTART" = "t" -o "$XMSTART" = "T" ]
				then
					TestMinStart $XMSTOP
					XMSTART=$fanval
				fi
			else
				XMSTART=$DEFMINSTART
			fi
			if [ "$MINSTART" = "" ]
			then
				MINSTART="${pwms}=${XMSTART}"
			else
				MINSTART="`echo $MINSTART | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMSTART}"
			fi

			if [ $XMSTOP -gt 0 ]
			then
				echo
				echo "Enter the PWM value (0-$XMSTOP) to use when the temperature"
				echo -n "is below the low temperature limit (0): "
				read XMINP
			else
				XMINP=""
			fi
			if [ -n "$XMINP" ]
			then
				if [ "$MINPWM" = "" ]
				then
					MINPWM="${pwms}=${XMINP}"
				else
					MINPWM="`echo $MINPWM | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMINP}"
				fi
			fi
			echo
			echo "Enter the PWM value ($XMSTOP-$MAX) to use when the temperature"
			echo -n "is over the high temperature limit ($MAX): "
			read XMAXP
			if [ -n "$XMAXP" ]
			then
				if [ "$MAXPWM" = "" ]
				then
					MAXPWM="${pwms}=${XMAXP}"
				else
					MAXPWM="`echo $MAXPWM | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMAXP}"
				fi
			fi
			echo
			echo "Enter the smoothing to be used where"
			echo "0 means no smoothing"
			echo "higher values result in more smoothing"
			read XSMOP
			if [ -n "$XSMOP" ]
			then
				if [ "$SMOOTHING" = "" ]
				then
					SMOOTHING="${pwms}=${XSMOP}"
				else
					SMOOTHING="`echo $SMOOTHING | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XSMOP}"
				fi
			fi
			echo
			echo "Enter the Hystereses Temperature."
			echo "This won't affect the quadratic shape of the min and max functions"
			echo "it will just move the upper temperature curve to the left and the lower to the right"
			read XTHYP
			if [ -n "$XTHYP" ]
			then
				if [ "$THYST" = "" ]
				then
					THYST="${pwms}=${XTHYP}"
				else
					THYST="`echo $THYST | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XTHYP}"
				fi
			fi
			echo
			break;
		done
		break ;;

	*)
		echo "No such option. Enter a number."
		break ;;
	esac
done
done