#!/bin/sh
# UTF-8

# I2Cチャンネル。旧基板は I2C-0 最近のは I2C-1
REV=`cat /proc/cpuinfo | grep 'Revision' | awk '{print $3}' | sed 's/1000//'`
if [ $REV = "0002" -o $REV = "0003" ]; then
	I2C=0
else
	I2C=1
fi

# スクリプト名称
SNAME=/usr/local/bin/start-rtc1307.sh

# RTC DS1307を有効にするスクリプト
SCR=`cat <<EOS
echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-${I2C}/new_device
hwclock -s
EOS
`

# Systemdの設定ファイル
CNF=`cat <<EOM
[Unit]
Description=RTC DS1307 Start
After=local-fs.target

[Service]
Type=oneshot
ExecStart=${SNAME}

[Install]
WantedBy=rc-local.service
EOM
`

if [ `dpkg -l | grep i2c-tools | wc -l` -eq 0 ]; then
	apt-get install i2c-tools
	if [ $? -ne 0 ]; then
		echo ERROR 1
		exit
	fi
fi

if [ `cat /etc/modules | grep i2c-dev | wc -l` -eq 0 ]; then
	echo "i2c-dev" >> /etc/modules
fi

if [ `cat /etc/modules | grep rtc-ds1307 | wc -l` -eq 0 ]; then
	echo "rtc-ds1307" >> /etc/modules
fi

# Raspbianバージョンチェック
ver=`cat /etc/debian_version | awk -F. '{print $1}'`

if [ $ver -lt 8 ];
then
	echo please add to /etc/rc.local before 'exit 0'
	echo
	echo "$SCR"
	exit
fi


echo "#!/bin/sh" > $SNAME
if [ $? -ne 0 ]; then
	echo ERROR 2
	exit
fi
echo "" >> $SNAME
echo "$SCR" >> $SNAME
chmod +x $SNAME

echo "$CNF" > /etc/systemd/system/start-rtc1307.service
if [ $? -ne 0 ]; then
	echo ERROR 3
	exit
fi

systemctl daemon-reload
systemctl enable start-rtc1307.service
if [ $? -ne 0 ]; then
	echo ERROR 4
	exit
fi

echo Install Done.
exit