#!/bin/sh

if [ $# -ne 2 ]; then
    echo "Usage: $0 vid pid" >&2
    exit 1
fi

prefix=/dev/serial/by-id

for dev in `ls $prefix`; do
    if [ `udevadm info -q property --name $prefix/$dev | egrep -i "ID_VENDOR_ID=($1)|ID_MODEL_ID=($2)" | wc -l` -eq 2 ]; then
        echo `readlink -f $prefix/$dev`
        exit 0
    fi
done
exit 2