#!/bin/bash

case ${1} in
        I2) GPIO=20 ;;
        I3) GPIO=21 ;;
        I4) GPIO=26 ;;
        PIN8) GPIO=8 ;;
        PIN7) GPIO=7 ;;
	*)
		echo "Input not defined" >&2
		exit 1
		;;
esac

if [ -z "${GPIO}" ]; then
	CHIP_BASE_DIR="/sys/bus/i2c/devices/1-00${ADDR}/gpio"
	CHIP_NAME="$(ls ${CHIP_BASE_DIR})"
	CHIP_DIR="${CHIP_BASE_DIR}/${CHIP_NAME}"
	CHIP="${CHIP_NAME#gpiochip}"

	GPIO="$((${INDEX} + ${CHIP}))"
fi

if [ ! -d /sys/class/gpio/gpio${GPIO} ]; then
	echo "${GPIO}" > /sys/class/gpio/export
fi

echo in > /sys/class/gpio/gpio${GPIO}/direction
cat /sys/class/gpio/gpio${GPIO}/value