#! /bin/sh

[ "$SUBSYSTEM" -ne "tty" ] && exit 0
if [ -z "$MAJOR" ] || [ -z "$MINOR" ]; then
    exit 0
fi

MAJOR_HEX=$(echo $(printf %2x "$MAJOR"))
MINOR_HEX=$(echo $(printf %2x "$MINOR"))

# env | while read line; do
#           logger -t "$0" "$line"
#       done

case "$ACTION" in
    add)
        dev_root="/sys/$DEVPATH/../../../../"
        itf_root="/sys/$DEVPATH/../../../"
        vid="$(cat $dev_root/idVendor 2> /dev/null)"
        pid="$(cat $dev_root/idProduct 2> /dev/null)"
        serial="$(cat $dev_root/serial 2> /dev/null)"
        [ -z "$serial" ] && serial='0'
        itf="$(cat $itf_root/bInterfaceNumber 2> /dev/null)"
        dev_name="${vid}_${pid}_${serial}_${itf}"
        dev_file="/dev/uart/$dev_name"
        logger -t "$0" "creating device: $dev_file"
        mknod "$dev_file" c "$MAJOR" "$MINOR"
        ;;

    remove)
        removed_major_minor="$MAJOR_HEX:$MINOR_HEX"

        for f in /dev/uart/*; do
            file_major_minor="$(stat -c %t:%T "$f")"
            #logger -t "$0" "$f | $removed_major_minor | $file_major_minor"

            if [ "$file_major_minor" = "$removed_major_minor" ]; then
                logger -t "$0" "removing device: $f"
                rm -f "$f"
            fi
        done
        ;;
esac