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#!/bin/bash
# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# List of options the script accepts. Trailing column means that the option
# requires an argument.
ARGUMENT_LIST=(
"help"
"product-id:"
"product-name:"
"host-mac:"
"bind-device:"
"dev-mac:"
"gadget-dir-name:"
"iface-name:"
)
print_usage() {
cat <<HELP
$0 [OPTIONS] [stop|start]
Create USB Gadget Configuration
--product-id USB Product Id for the gadget.
--product-name Product name string (en) for the gadget.
--host-mac MAC address of the host part of the connection. Optional.
--dev-mac MAC address of the device (gadget) part of the connection. Optional.
--bind-device Name of the device to bind, as listed in /sys/class/udc/
--gadget-dir-name Optional base name for gadget directory. Default: "g1"
--iface-name Optional name of the network interface. Default: "usb0"
--help Print this help and exit.
HELP
}
gadget_start() {
local gadget_dir="${CONFIGFS_HOME}/usb_gadget/${GADGET_DIR_NAME}"
mkdir -p "${gadget_dir}"
echo ${ID_VENDOR} > "${gadget_dir}/idVendor"
echo ${ID_PRODUCT} > "${gadget_dir}/idProduct"
local str_en_dir="${gadget_dir}/strings/0x409"
mkdir -p "${str_en_dir}"
echo ${STR_EN_VENDOR} > "${str_en_dir}/manufacturer"
echo ${STR_EN_PRODUCT} > "${str_en_dir}/product"
local config_dir="${gadget_dir}/configs/c.1"
mkdir -p "${config_dir}"
echo 100 > "${config_dir}/MaxPower"
mkdir -p "${config_dir}/strings/0x409"
echo "ECM" > "${config_dir}/strings/0x409/configuration"
local func_dir="${gadget_dir}/functions/ecm.${IFACE_NAME}"
mkdir -p "${func_dir}"
if [[ -n $HOST_MAC_ADDR ]]; then
echo ${HOST_MAC_ADDR} > ${func_dir}/host_addr
fi
if [[ -n $DEV_MAC_ADDR ]]; then
echo ${DEV_MAC_ADDR} > ${func_dir}/dev_addr
fi
ln -s "${func_dir}" "${config_dir}"
echo "${BIND_DEVICE}" > ${gadget_dir}/UDC
}
gadget_stop() {
local gadget_dir="${CONFIGFS_HOME}/usb_gadget/${GADGET_DIR_NAME}"
rm -f ${gadget_dir}/configs/c.1/ecm.${IFACE_NAME}
rm -rf ${gadget_dir}/configs/c.1/strings/0x409
rm -rf ${gadget_dir}/configs/c.1
rm -rf ${gadget_dir}/strings/0x409
rm -rf ${gadget_dir}/functions/ecm.${IFACE_NAME}
rm -rf ${gadget_dir}
}
opts=$(getopt \
--longoptions "$(printf "%s," "${ARGUMENT_LIST[@]}")" \
--name "$(basename "$0")" \
--options "" \
-- "$@"
)
eval set --$opts
CONFIGFS_HOME=${CONFIGFS_HOME:-/sys/kernel/config}
ID_VENDOR="0x18d1" # Google
ID_PRODUCT=""
STR_EN_VENDOR="Google"
STR_EN_PRODUCT=""
DEV_MAC_ADDR=""
HOST_MAC_ADDR=""
BIND_DEVICE=""
ACTION="start"
GADGET_DIR_NAME="g1"
IFACE_NAME="usb0"
while [[ $# -gt 0 ]]; do
case "$1" in
--product-id)
ID_PRODUCT=$2
shift 2
;;
--product-name)
STR_EN_PRODUCT=$2
shift 2
;;
--host-mac)
HOST_MAC_ADDR=$2
shift 2
;;
--dev-mac)
DEV_MAC_ADDR=$2
shift 2
;;
--bind-device)
BIND_DEVICE=$2
shift 2
;;
--gadget-dir-name)
GADGET_DIR_NAME=$2
shift 2
;;
--iface-name)
IFACE_NAME=$2
shift 2
;;
--help)
print_usage
exit 0
;;
start)
ACTION="start"
shift 1
break
;;
stop)
ACTION="stop"
shift 1
break
;;
--)
shift 1
;;
*)
break
;;
esac
done
if [[ $ACTION == "stop" ]]; then
gadget_stop
else
gadget_start
fi
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