brdebug/bin/setup-usb-link

#!/bin/sh
#
# Copyright 2015 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.
#
# Script that sets up the USB debug link.

set -e

CONFIG_ROOT="/sys/kernel/config"
NCM_GADGET="ncm1"
NETWORK_NAME="usb0"
STRING_FOLDER="strings/0x409"
# TODO (yimingc@) Change this to a board-specific variable.
UDC_DEVICE_NAME="ff580000.usb"

# TODO (yimingc@) Change VID/PID to the actual assigned values.
VENDOR_ID="0x0101"
PRODUCT_ID="0x0202"
CONFIGURATION_NAME="NCM Network Configuration"
SERIAL_NUMBER="1"
MANUFACTURER_NAME="Google"
PRODUCT_NAME="Brillo Debug Link"

main() {
  if [ $# -ne 0 ]; then
    echo "$0: error: program takes no args" > &2
    exit 1
  fi

  modprobe configfs || true
  modprobe libcomposite || true

  # Create NCM gadget folder.
  mount -t configfs none "${CONFIG_ROOT}"
  mkdir "${CONFIG_ROOT}/usb_gadget/${NCM_GADGET}"
  cd "${CONFIG_ROOT}/usb_gadget/${NCM_GADGET}"

  # Create NCM network function and configuration.
  mkdir "functions/ncm.${NETWORK_NAME}"
  mkdir configs/c.1

  # Write the required strings for NCM descriptor enumeration.
  echo "${VENDOR_ID}" > idVendor
  echo "${PRODUCT_ID}" > idProduct
  mkdir "${STRING_FOLDER}"
  echo "${SERIAL_NUMBER}" > "${STRING_FOLDER}/serialnumber"
  echo "${MANUFACTURER_NAME}" > "${STRING_FOLDER}/manufacturer"
  echo "${PRODUCT_NAME}" > "${STRING_FOLDER}/product"
  mkdir "configs/c.1/${STRING_FOLDER}"
  echo "${CONFIGURATION_NAME}" > "configs/c.1/${STRING_FOLDER}/configuration"

  # Activate the NCM gadget.
  ln -s "functions/ncm.${NETWORK_NAME}" configs/c.1
  echo "${UDC_DEVICE_NAME}" > UDC
  echo "connect" > /sys/class/udc/"${UDC_DEVICE_NAME}"/soft_connect
  sleep 3
  ifconfig "${NETWORK_NAME}" 169.254.100.2 netmask 255.255.255.0
}

main "$@"