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#!/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

#! /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