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#!/bin/sh -e
#
# Copyright 2016 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Add a USB VID:PID device ID to the usbserial list of handled devices
if [ $# -ne 2 ]; then
echo ""
echo "Usage: $0 <VID> <PID>"
echo ""
echo "Add a USB VID:PID device identification pair to the list of devices"
echo "that usbserial will recognize. This script ensures that a device is"
echo "not added more than once."
echo ""
exit 1
fi
#
# Firts ensure that the usbserial module is loaded. This is required as there
# may be no other USB serial adaptor connected yet.
#
modprobe usbserial
device_id="$1 $2"
file="/sys/bus/usb-serial/drivers/generic/new_id"
#
# Only add the device ID pair if it isn't already in the ID list.
#
grep -q "$device_id" $file || echo $device_id > $file
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