#!/bin/bash

. /tmp/cmdline
. /usr/bin/i2csetup

if [ ${1} ]; then
    I2CCONFIGBUS=${1}
fi

if [ ${2} ]; then
    I2CCONFIGADDRESS=${2}
fi

if [ ${3} ]; then
    let offset=(${3}*32)+3
else
    let offset=3
fi

if [ -z "$(which i2cutil)" ] ; then
    echo "i2crdsubtype: i2cutil not found"
    exit 1
else
    #read only first card found
    for BUS in ${I2CCONFIGBUS};do 
        subtype=$(i2cutil -y -r ${BUS} ${I2CCONFIGADDRESS} ${offset} b)
        rc=$?
        printf "%02x\n" ${subtype}
        exit $rc
    done
fi
