#!/bin/sh
#
# This script will find all PNP configured standard PC serial ports and
# then "bounce" them by disabling and then enabling them
#
# I suggest that you place this script in /sbin and call it 
# at the top of /etc/setserial or /etc/etc-setserial, depending on your
# configuration

ENABLE=0
DISABLE=2
ID="id"
SERIAL_PORT="PNP0500"
STATE="power/state"
PNP_DIR="/sys/bus/pnp/devices"

for device in ${PNP_DIR}/*; do
  if grep -q ${SERIAL_PORT} ${device}/${ID}; then
    echo found serial port at $device, going to bounce it
    echo -n ${DISABLE} > ${device}/${STATE}
    echo -n ${ENABLE} > ${device}/${STATE}
  fi
done