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S49usbgadget
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S49usbgadget
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#!/bin/sh
# init script for usb gadget with adb and rndis
# put this on the device at: /etc/init.d/S49usbgadget
# 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
echo "configuring USB Gadget with adb and rndis"
# first we create some device nodes
mkdir -p /dev/usb-ffs
mkdir -p /dev/usb-ffs/adb
# mount configfs, which is an interface that allows definition of arbitrary functions and configurations to
# define an application specific USB composite device from userspace.
mount -t configfs none /sys/kernel/config/
# lets instantiate a new gadget device template
mkdir -p /sys/kernel/config/usb_gadget/g1
# write some identifying information
echo 0x18d1 > /sys/kernel/config/usb_gadget/g1/idVendor
echo 0x4e40 > /sys/kernel/config/usb_gadget/g1/idProduct
echo 0x0223 > /sys/kernel/config/usb_gadget/g1/bcdDevice
echo 0x0200 > /sys/kernel/config/usb_gadget/g1/bcdUSB
# instantiate english language strings
mkdir -p /sys/kernel/config/usb_gadget/g1/strings/0x409
# write some more identifying information for this device
echo 123456 > /sys/kernel/config/usb_gadget/g1/strings/0x409/serialnumber
echo Spotify > /sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer
echo Superbird > /sys/kernel/config/usb_gadget/g1/strings/0x409/product
# create function instances. here we create function for Android Debug Bridge, and another for usb network
mkdir -p /sys/kernel/config/usb_gadget/g1/functions/ffs.adb # adb
mkdir -p /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0 # usbnet
# create a configuration instance
mkdir -p /sys/kernel/config/usb_gadget/g1/configs/b.1
# create english language strings
mkdir -p /sys/kernel/config/usb_gadget/g1/configs/b.1/strings/0x409
# write a description for this device configuration
echo adb > /sys/kernel/config/usb_gadget/g1/configs/b.1/strings/0x409/configuration
# configure an attribute, maxpower in this case
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/b.1/MaxPower
# link our config with the os_desc config
ln -s /sys/kernel/config/usb_gadget/g1/configs/b.1 /sys/kernel/config/usb_gadget/g1/os_desc/b.1
# bind our function instance to its configuration
ln -s /sys/kernel/config/usb_gadget/g1/functions/ffs.adb /sys/kernel/config/usb_gadget/g1/configs/b.1
ln -s /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0 /sys/kernel/config/usb_gadget/g1/configs/b.1
# mount the adb function filesystem
mount -t functionfs adb /dev/usb-ffs/adb
# kick off the adb daemon in the background, and give it time to initialize
echo "starting adb daemon"
/usr/bin/adbd &
sleep 5s
# attach the created gadget deviec to our UDC driver
# echo ff400000.dwc2_a > /sys/kernel/config/usb_gadget/g1/UDC
UDC_DEVICE=$(ls -1 /sys/class/udc/)
echo "$UDC_DEVICE" > /sys/kernel/config/usb_gadget/g1/UDC
sleep 3s
echo "bringing up usb0"
# bring up the usb0 interface
ifconfig usb0 up
ifconfig usb0 192.168.7.2 netmask 255.255.255.0 broadcast 192.168.7.255
# give some time for usb0 to be ready
sleep 3s
echo "adding routes for usb0"
# set routing to use the usb0 interface
# route add default via 192.168.7.1 dev usb0
ip route add default via 192.168.7.1 dev usb0