Fan control for LS-WVL on Debian with custom kernel

# ---------------------------------
# Fan control script for the LS-WVL
# ---------------------------------

# Part of a bigger guide here: http://pastebin.com/H6rEZ5ge
# ---
# To recover automatic fan control. If the HDD temperature goes up, so goes the fan.
# ---
# Sources: * http://forum.buffalo.nas-central.org/viewtopic.php?f=73&t=25947 (Do not use scripts there, read on)
#          * Email from hato (http://forum.buffalo.nas-central.org/memberlist.php?mode=viewprofile&u=5411)

# First we install hddtemp
apt-get update
apt-get install hddtemp

nano /usr/local/sbin/temperature-monitor

# Put this in /usr/local/sbin/temperature-monitor

#!/bin/sh
# An alternative temperature monitoring and fan control script for
# WD MyBook World Edition external hard drives
#
# Copyright (C) 2007 by kyyhkynen at gmail.com
#
# You may do with this file (and parts thereof) whatever you want, as long
# as my copyright notice is retained.
# last updated 2008/04/23
#
#120411:    Adapted for vanilla kernel patched for LS-WVL/E-AP
#

########################################################
#
# Configuration settings
#
########################################################

# Disk(s) to monitor.
DISK1=sda
DISK2=sdb

# Program location. we'll use HDDTEMP to get the temperature if available, otherwise
# smartctl will be used
HDPARM=$(which hdparm)
HDDTEMP=$(which hddtemp)
SMARTCTL=$(which smartctl)

# Control interfaces
ALARM_LED=/sys/devices/platform/leds-gpio/leds/lswvl:alarm:red
ALARM_LED_TRIGGER=${ALARM_LED}/trigger
ALARM_LED_BRIGHTNESS=${ALARM_LED}/brightness
ALARM_LED_DELAY_ON=${ALARM_LED}/delay_on
ALARM_LED_DELAY_OFF=${ALARM_LED}/delay_off

FAN_CTRL=/sys/devices/platform/gpio-fan
FAN_TARGET=${FAN_CTRL}/fan1_target
FAN_INPUT=${FAN_CTRL}/fan1_input

# (default) temperature limits for speeds.
# When the temperature of the disk(s) is below TEMP_LOW, the fan speed is set to 0
# When the temperature of the disk(s) is above TEMP_LOW, the fan speed is set to 1500
# When the temperature of the disk(s) is above TEMP_HIGH, the fan speed is set to 3250
# When the temperature of the disk(s) goes beyond TEMP_FULL, the fan speed is set to 5000
TEMP_LOW=36
TEMP_HIGH=45
TEMP_FULL=50

# Temperature hysteresis for actually lower-down/stop the fan, i.e. the gap between
# lowering down and speeding up the fan to avoid frequently change of the speed
TEMP_HYS=3

[ -s /etc/default/temp-monitor ] && . /etc/default/temp-monitor

#fan speeds
SPEED_STOP=0
SPEED_LOW=1500
SPEED_HIGH=3250
SPEED_FULL=5000

# Logging stuff
LOG_ENABLED=false
LOG_INTERVAL=1 #in half minute
#LOGGER="echo Temp. monitor:"
LOGGER="/usr/bin/logger -t temp-monitor"

#######################################################################
#
# End of configuration. You shouldn't need to touch lines below this :)
#
#######################################################################

# Device name(s) for the disk(s).
DEV1=/dev/${DISK1}
DEV2=/dev/${DISK2}

# temperature threshold for lower-down/stop the fan
TEMP_STOP=$((TEMP_LOW - TEMP_HYS))
TEMP_DN_LOW=$((TEMP_HIGH - TEMP_HYS))
TEMP_DN_HIGH=$((TEMP_FULL - TEMP_HYS))

hdd_temp()
{
    temp=
    hdtemp=-274
    if [ -n "$HDDTEMP" ]; then
        [ -b $DEV1 ] && hdtemp=$($HDDTEMP -n $DEV1)
        [ -b $DEV2 ] && {
            temp=$($HDDTEMP -n $DEV2)
            [ $temp -gt $hdtemp ] && hdtemp=$temp
        }
    elif [ -n "$SMARTCTL" ]; then
        [ -b $DEV1 ] && hdtemp=$($SMARTCTL -d ata -A $DEV1 | grep Tempera | cut -c 88-90)
        [ -b $DEV2 ] && {
            temp=$($SMARTCTL -d ata -A $DEV2 | grep Tempera | cut -c 88-90)
            [ $temp -gt $hdtemp ] && hdtemp=$temp
        }
    fi
    echo "$hdtemp"
}

alarm_blink()
{
    if [ $1 = "on" ]; then
        echo 1 > $ALARM_LED_BRIGHTNESS  #light the alarm led
        echo timer > $ALARM_LED_TRIGGER #blink it
        echo 333 > $ALARM_LED_DELAY_ON
        echo 333 > $ALARM_LED_DELAY_OFF
    elif [ $1 = "off" ]; then
        echo 0 > $ALARM_LED_BRIGHTNESS  #turn off the alarm led
        echo none > $ALARM_LED_TRIGGER  #restore trigger
    fi
}

fan_speed()
{
    if [ $1 = "get" ]; then
        cat $FAN_INPUT
    elif [ $1 = "set" ]; then
        echo $2 > $FAN_TARGET
    fi
}

HDD_TEMP=$(hdd_temp)
if [ $HDD_TEMP -eq -274 -o ! -d "$FAN_CTRL"  ]; then
    $LOG_ENABLED && ${LOGGER} "Required program (hddtemp or smartctl), harddisk or fan control interface not found, exit now."
    exit 1
fi

# Get current fan speed
fspeed=$(fan_speed get)
log_counter=0

while true; do

    if [ $HDD_TEMP -ge $TEMP_FULL ]; then
        [ $fspeed -lt $SPEED_FULL ] && fan_speed set $SPEED_FULL
        fspeed=$SPEED_FULL
        alarm_blink on
    else
        alarm_blink off
        if [ $HDD_TEMP -gt $TEMP_DN_HIGH -a $fspeed -lt $SPEED_FULL ]; then
            [ $fspeed -ne $SPEED_HIGH ] && fan_speed set $SPEED_HIGH
            fspeed=$SPEED_HIGH
        elif [ $HDD_TEMP -ge $TEMP_HIGH ]; then
            [ $fspeed -ne $SPEED_HIGH ] && fan_speed set $SPEED_HIGH
            fspeed=$SPEED_HIGH
        elif [ $HDD_TEMP -gt $TEMP_DN_LOW -a $fspeed -lt $SPEED_HIGH ]; then
            [ $fspeed -ne $SPEED_LOW ] && fan_speed set $SPEED_LOW
            fspeed=$SPEED_LOW
        elif [ $HDD_TEMP -ge $TEMP_LOW ]; then
            [ $fspeed -ne $SPEED_LOW ] && fan_speed set $SPEED_LOW
            fspeed=$SPEED_LOW
        elif [ $HDD_TEMP -gt $TEMP_STOP -a $fspeed -lt $SPEED_LOW ]; then
            [ $fspeed -ne $SPEED_STOP ] && fan_speed set $SPEED_STOP
            fspeed=$SPEED_STOP
        else
            [ $fspeed -ne $SPEED_STOP ] && fan_speed set $SPEED_STOP
            fspeed=$SPEED_STOP
        fi
    fi

    log_counter=$(( log_counter + 1 ))
    if [ $log_counter -ge $((LOG_INTERVAL * 2)) ]; then
        $LOG_ENABLED && ${LOGGER} "${HDD_TEMP} ${fspeed}"
        log_counter=0
    fi

    sleep 30
    HDD_TEMP=$(hdd_temp)
done

# Save with CTRL+O and exit with CTRL+X

nano /etc/init.d/temperature-monitor

# Put this in /etc/init.d/temperature-monitor

#! /bin/sh
#
# temperature_monitor startup/stop script
# made for WD MyBook World II by kyyhkynen at gmail.com

### BEGIN INIT INFO
# Provides:        temperature_mon
# Required-Start:  $local_fs $syslog
# Required-Stop:   $local_fs $syslog
# Default-Start:   1 2 3 4 5
# Default-Stop:    0 6
# Short-Description: Start temperature monitor daemon
### END INIT INFO

SVC_NAME="Temperature Monitor"
SVC_SCRIPT=/usr/local/sbin/temperature-monitor
SVC_PID=/var/run/$(basename ${SVC_SCRIPT}).pid

checkconfig() {
   if [ ! -r $SVC_SCRIPT ] ; then
      echo "$SVC_NAME not found at $SVC_SCRIPT"
      return 1
   fi
}


start() {
   checkconfig || return 1
   echo "Starting ${SVC_NAME}"
   start-stop-daemon --start --background --quiet \
      --pidfile ${SVC_PID} --make-pidfile \
      --exec ${SVC_SCRIPT}
}

stop() {
   echo "Stopping ${SVC_NAME}"
   start-stop-daemon --stop --quiet --pidfile ${SVC_PID}
}

case "$1" in
   start)
      start
      ;;
   stop)
      stop
      ;;
   restart)
      stop
      start
      ;;
   *)
      echo $"Usage: $0 {start|stop|restart}"
      exit 1
      ;;
esac

# Update rc.d:

/etc/init.d/update-rc.d temperature-monitor defaults

# Reboot the device to check if the monitor is started upon boot

reboot
ps -A | grep temperature-mon

# Output should be something like
#  1348 ?        00:00:00 temperature-mon

# To check if the temperature monitor is actually doing something, you can turn
# on the red LED. Within 30 seconds it should turn off again

echo 1 > /sys/devices/platform/leds-gpio/leds/lswvl\:alarm\:red/brightness

# You can check the hdd temperature (celcius degree) and current fan speed (rpm):
hddtemp /dev/sda                    # Output drive info + temperature
hddtemp /dev/sdb -n                 # Only give temperature
cat /sys/devices/platform/gpio-fan/fan1_input       # Fan speed