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armbian-common: ship a script to aid in setting up USB gadget mode

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this was picked from armbian/build#8382
This commit is contained in:
Ayush Singh
2025-12-11 04:51:40 +08:00
committed by Rolf Leggewie
parent d91080ab25
commit 8ae4056957
1 changed files with 105 additions and 0 deletions
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105
files/armbian-common/usr/share/usb-gadget-mode/setup-usbgadget-network-multi.sh Normal file
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#!/bin/bash
set -euo pipefail
deviceinfo_name="USB Gadget Network"
deviceinfo_manufacturer="Armbian"
#deviceinfo_usb_idVendor=
#deviceinfo_usb_idProduct=
#deviceinfo_usb_serialnumber=
exit_with_error() {
echo "$1"
exit 1
}
setup_usb_network_configfs() {
# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
CONFIGFS=/sys/kernel/config/usb_gadget
if ! [ -e "$CONFIGFS" ]; then
exit_with_error "$CONFIGFS does not exist, skipping configfs usb gadget"
fi
if [ -e "$CONFIGFS/g1" ]; then
echo "$CONFIGFS/g1 already exists, skipping configfs usb gadget"
return
fi
# Default values for USB-related deviceinfo variables
usb_idVendor="${deviceinfo_usb_idVendor:-0x1D6B}" # Linux Foundation
usb_idProduct="${deviceinfo_usb_idProduct:-0x0104}" # Multifunction Composite Gadget
usb_serialnumber="${deviceinfo_usb_serialnumber:-0123456789}"
usb_network_function="ncm.usb0"
usb_serial_function="acm.usb0"
echo "Setting up an USB gadget through configfs"
# Create an usb gadet configuration
mkdir $CONFIGFS/g1 || exit_with_error "Couldn't create $CONFIGFS/g1"
echo "$usb_idVendor" > "$CONFIGFS/g1/idVendor"
echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
echo 0x0404 > "$CONFIGFS/g1/bcdDevice"
echo 0x0200 > "$CONFIGFS/g1/bcdUSB"
# Create english (0x409) strings
mkdir $CONFIGFS/g1/strings/0x409 || echo "Couldn't create $CONFIGFS/g1/strings/0x409"
# shellcheck disable=SC2154
echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer"
echo "$usb_serialnumber" > "$CONFIGFS/g1/strings/0x409/serialnumber"
# shellcheck disable=SC2154
echo "$deviceinfo_name" > "$CONFIGFS/g1/strings/0x409/product"
# Create network function.
mkdir $CONFIGFS/g1/functions/"$usb_network_function" ||
echo "Couldn't create $CONFIGFS/g1/functions/$usb_network_function"
# Create configuration instance for the gadget
mkdir $CONFIGFS/g1/configs/c.1 ||
echo "Couldn't create $CONFIGFS/g1/configs/c.1"
echo 250 > $CONFIGFS/g1/configs/c.1/MaxPower
mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 ||
echo "Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
echo "NCM Configuration" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration ||
echo "Couldn't write configration name"
# Link the network instance to the configuration
ln -s $CONFIGFS/g1/functions/"$usb_network_function" $CONFIGFS/g1/configs/c.1 ||
echo "Couldn't symlink $usb_network_function"
mkdir -p $CONFIGFS/g1/functions/"$usb_serial_function" ||
echo "Couldn't create $CONFIGFS/g1/functions/$usb_serial_function"
ln -s $CONFIGFS/g1/functions/"$usb_serial_function" $CONFIGFS/g1/configs/c.1 ||
echo "Couldn't symlink $usb_serial_function"
# Check if there's an USB Device Controller
if [ ! -d /sys/class/udc ] || [ -z "$(ls /sys/class/udc 2>/dev/null)" ]; then
exit_with_error "No USB Device Controller available"
fi
# Link the gadget instance to an USB Device Controller. This activates the gadget.
# See also: https://github.com/postmarketOS/pmbootstrap/issues/338
# shellcheck disable=SC2005
ls /sys/class/udc | head -1 > $CONFIGFS/g1/UDC || exit_with_error "Couldn't write UDC"
}
set_usbgadget_ipaddress() {
local host_ip="${unudhcpd_host_ip:-172.16.42.1}"
local client_ip="${unudhcpd_client_ip:-172.16.42.2}"
echo "Starting dnsmasq with server ip $host_ip, client ip: $client_ip"
# Get usb interface
INTERFACE=""
ip addr replace "${host_ip}/16" dev usb0 2>/dev/null && ip link set usb0 up && INTERFACE=usb0
if [ -z "$INTERFACE" ]; then
echo "Interfaces:"
ip link
exit_with_error "Could not find an interface to run a dhcp server on"
fi
echo "Using interface $INTERFACE"
echo "Starting the DHCP daemon"
ip a show $INTERFACE > /var/log/unudhcpd.log
nohup /usr/bin/unudhcpd -i "$INTERFACE" -s "$host_ip" -c "$client_ip" >> /var/log/unudhcpd.log 2>&1 &
return
}
setup_usb_network_configfs
set_usbgadget_ipaddress