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setup_usbgadget.sh
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#!/bin/bash
# Setup Linux USB Gadget for just rndis
# this version is meant to run within native debian on the device
# Available options:
# usb_f_rndis.ko
# usb_f_fs.ko
# usb_f_midi.ko
# usb_f_mtp.ko
# usb_f_ptp.ko
# usb_f_audio_source.ko
# usb_f_accessory.ko
######### Variables
USBNET_PREFIX="192.168.7"
SERIAL_NUMBER="12345678"
# 18d1:4e40 Google Inc. Nexus 7
ID_VENDOR="0x18d1"
ID_PRODUCT="0x4e40"
MANUFACTURER="Spotify"
PRODUCT="Superbird"
# ADBD_LOG_FILE="/tmp/adbd.log"
# Research
# starting point: https://github.com/frederic/superbird-bulkcmd/blob/main/scripts/enable-adb.sh.client
# info about configfs https://elinux.org/images/e/ef/USB_Gadget_Configfs_API_0.pdf
# info about usbnet and bridging https://developer.ridgerun.com/wiki/index.php/How_to_use_USB_device_networking
# more info, including for windows https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget/ethernet-gadget
# a gist that was helpful: https://gist.github.com/geekman/5bdb5abdc9ec6ac91d5646de0c0c60c4
# https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
######### Functions
create_device() {
# create usb gadget device
ID_VEND="$1"
ID_PROD="$2"
BCD_DEVICE="$3"
BCD_USB="$4"
echo "### Creating device $ID_VEND $ID_PROD"
mkdir -p "/dev/usb-ffs"
mkdir -p "/dev/usb-ffs/adb"
mountpoint /sys/kernel/config/ || mount -t configfs none "/sys/kernel/config/"
mkdir -p "/sys/kernel/config/usb_gadget/g1"
echo "$ID_VEND" > "/sys/kernel/config/usb_gadget/g1/idVendor"
echo "$ID_PROD" > "/sys/kernel/config/usb_gadget/g1/idProduct"
echo "$BCD_DEVICE" > "/sys/kernel/config/usb_gadget/g1/bcdDevice"
echo "$BCD_USB" > "/sys/kernel/config/usb_gadget/g1/bcdUSB"
mkdir -p "/sys/kernel/config/usb_gadget/g1/strings/0x409"
sleep 1
}
configure_device() {
# configure usb gadget device
MANUF="$1"
PROD="$2"
SERIAL="$3"
CONFIG_NAME="$4"
echo "### Configuring device as $MANUF $PROD"
echo "$MANUF" > "/sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer"
echo "$PROD" > "/sys/kernel/config/usb_gadget/g1/strings/0x409/product"
echo "$SERIAL" > "/sys/kernel/config/usb_gadget/g1/strings/0x409/serialnumber"
mkdir -p "/sys/kernel/config/usb_gadget/g1/configs/c.1"
mkdir -p "/sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409"
echo "$CONFIG_NAME" > "/sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409/configuration"
echo 500 > "/sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower"
ln -s "/sys/kernel/config/usb_gadget/g1/configs/c.1" "/sys/kernel/config/usb_gadget/g1/os_desc/c.1"
sleep 1
}
add_function(){
# add a function to existing config id
FUNCTION_NAME="$1"
echo "### adding function $FUNCTION_NAME to config c.1"
mkdir -p "/sys/kernel/config/usb_gadget/g1/functions/${FUNCTION_NAME}"
ln -s "/sys/kernel/config/usb_gadget/g1/functions/${FUNCTION_NAME}" "/sys/kernel/config/usb_gadget/g1/configs/c.1"
}
start_adb_daemon() {
# mount adb functionfs and start daemon
LOG_FILE="$1"
echo "### starting adb daemon"
mkdir -p /dev/usbgadget/adb
mount -t functionfs adb /dev/usbgadget/adb
if [ ! -f "/usr/bin/adbd" ]; then
echo "Unable to find adbd binary!"
else
/usr/bin/adbd > "$LOG_FILE" 2>&1 &
echo "$!" > /tmp/adbd.pid
fi
sleep 5s
}
attach_driver(){
# attach the created gadget device to our UDC driver
UDC_DEVICE=$(/bin/ls -1 /sys/class/udc/) # ff400000.dwc2_a
echo "### Attaching gadget to UDC device: $UDC_DEVICE"
echo "$UDC_DEVICE" > /sys/kernel/config/usb_gadget/g1/UDC
sleep 1
}
configure_usbnet() {
DEVICE="$1"
NETWORK="$2" # just the first 3 octets
NETMASK="$3"
echo "### bringing up $DEVICE with ${NETWORK}.2"
ifconfig "$DEVICE" up
ifconfig "$DEVICE" "${NETWORK}.2" netmask "$NETMASK" broadcast "${NETWORK}.255"
echo "adding routes for $DEVICE"
ip route add default via "${NETWORK}.1" dev "$DEVICE"
echo "making sure you have a dns server"
echo "nameserver 1.1.1.1" > /etc/resolv.conf
sleep 1
}
shutdown_gadget() {
# shutdown and clean up usb gadget and services
# ref: https://wiki.tizen.org/USB/Linux_USB_Layers/Configfs_Composite_Gadget/Usage_eq._to_g_ffs.ko
echo "$UDC_DEVICE" > /sys/kernel/config/usb_gadget/g1/UDC
if [ -f "/tmp/adbd.pid" ]; then
kill -9 "$(cat /tmp/adbd.pid)"
umount /dev/usbgadget/adb
fi
find "/sys/kernel/config/usb_gadget/g1/configs/c.1" -type l -exec unlink {} \;
rm -r "/sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409"
rm -r /sys/kernel/config/usb_gadget/g1/strings/0x409
rm -r "/sys/kernel/config/usb_gadget/g1/configs/c.1"
rm -r /sys/kernel/config/usb_gadget/g1/functions/*
rm -r /sys/kernel/config/usb_gadget/g1/
}
######### Entrypoint
echo "### Configuring USB Gadget with adb and rndis"
create_device "$ID_VENDOR" "$ID_PRODUCT" "0x0223" "0x0200"
configure_device "$MANUFACTURER" "$PRODUCT" "$SERIAL_NUMBER" "Multi-Function Device"
add_function "rndis.usb0" # rndis usb ethernet
# add_function "ffs.adb" # adb
# start_adb_daemon "$ADBD_LOG_FILE"
attach_driver
configure_usbnet "usb0" "$USBNET_PREFIX" "255.255.255.0"
echo "Done setting up USB Gadget"