/usr/local/bin/temp-daemon.sh

#!/bin/bash
#
# SoC/HDD temperature daemon. Writes the current temperatures to
# /run/soc-temp and /run/hdd-temp (since we're experiencing always
# timeouts under heavy load when trying to get the temperatures
# directly from within RPi-Monitor.
#
# A directly connected DHT22 temperature/humidity sensor will
# also be queryied with this version and writes to /run/ambient-temp

Main() {
	# SoCTempAdjustment is needed because the A20 SoC delivers uncalibrated temp values
	SoCTempAdjustment=1447

	# write a reasonable base value to /run/ambient-raw-temp
	echo 25 >/run/ambient-raw-temp
	echo 25 >/run/ambient-raw2-temp

	# ensure module sunxi-dbgreg.ko is loaded
	grep -q sunxi_dbgreg </proc/modules || ( modprobe sunxi-dbgreg ; sleep 0.1 )

	# prepare registers
	# echo 'f1c25000:27003f' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/write;
	# echo 'f1c25010:40000' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/write;
	# echo 'f1c25018:10fff' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/write;
	# echo 'f1c25004:10' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/write;

	while true ; do
		# read ambient temperature from /run/ambient-raw-temp
		read AmbientTemp </run/ambient-raw-temp
		read AmbientTemp2 </run/ambient-raw2-temp
		if [ "X${AmbientTemp}" != "X" ]; then
			RoundedAmbientTemp=$( echo ${AmbientTemp} | cut -f1 -d. )
			if [ ${RoundedAmbientTemp} -lt 1 -o ${RoundedAmbientTemp} -gt 50 ]; then
				# skip recording of wrong values
				:
			else
				echo ${AmbientTemp} >/run/ambient-temp
			fi
		fi
		if [ "X${AmbientTemp2}" != "X" ]; then
                        RoundedAmbientTemp2=$( echo ${AmbientTemp2} | cut -f1 -d. )
                        if [ ${RoundedAmbientTemp2} -lt 1 -o ${RoundedAmbientTemp2} -gt 50 ]; then
                                # skip recording of wrong values
                                :
                        else
                                echo ${AmbientTemp2} >/run/ambient2-temp
                        fi
                fi
		timeout 3 /usr/local/bin/loldht 2 | awk -F" " '/Temperature/ {print $7}' >/run/ambient-raw2-temp
		timeout 3 /usr/local/bin/loldht 1 | awk -F" " '/Temperature/ {print $7}' >/run/ambient-raw-temp &

		# let the value be written to syslog
		echo 'f1c25020' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/read;

		# wait 0.5 seconds
		sleep 0.5

		# read return value from syslog and transform it into degrees Celsius
		HexVal=$(tail /var/log/syslog | awk -F" 0x" '/ 0x/ {print $2}' | tail -n1 )
		SoCTemp=$(echo $(( 0x${HexVal} - ${SoCTempAdjustment} )) | awk '{printf ("%0.1f",$1/10); }')
		if [ "X${SoCTemp}" != "X" ]; then
			echo -n ${SoCTemp} >/run/soc-temp
		fi

		# HDD/SSD temp
		DiskTemp=$(hddtemp -n /dev/sda)
		if [ "X${DiskTemp}" != "X" ]; then
			echo -n ${DiskTemp} >/run/hdd-temp
		fi

		# sleep 5 secs
		sleep 5
	done
} # Main

Main