added fancontrol script for odroid hc4

hc4_fancontrol.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+THRESHOLD=42000
+INTERVAL=30
+FAN="/sys/class/hwmon/hwmon2/pwm1"
+
+# set fan mode to manual
+echo "disabled" | tee /sys/class/thermal/thermal_zone{0,1}/mode > /dev/null
+
+# set fan speed to max if either cpu or ram is above $THRESHOLD
+while true; do
+  TOOHOT=0
+  FANSPEED=$(cat $FAN)
+  TEMP=($(cat /sys/devices/virtual/thermal/thermal_zone{0,1}/temp))
+  for i in ${TEMP[@]}; do
+    if [ $i -gt $THRESHOLD ]; then
+      TOOHOT=255
+    fi
+  done
+  if [ $TOOHOT -eq 0 ]; then
+    if [ $FANSPEED -ne $TOOHOT ]; then
+      echo 170 > $FAN; sleep 2
+      echo 120 > $FAN; sleep 2
+      echo $TOOHOT > $FAN
+    fi
+  else
+    if [ $FANSPEED -ne $TOOHOT ]; then
+      echo 120 > $FAN; sleep 2
+      echo 170 > $FAN; sleep 2
+      echo $TOOHOT > $FAN
+    fi
+  fi
+  # debug output
+  #echo "temp=${TEMP[@]},speed=$FANSPEED, toohot=$TOOHOT"
+  sleep $INTERVAL
+done