Linux USB UVC gadget driver setup script.

uvc-gadget-configfs.sh

#!/bin/bash

# set -e

cd /sys/kernel/config/usb_gadget/

mkdir -p g1
cd g1

echo 0x1d6b > idVendor # Linux Foundation
echo 0x0104 > idProduct # Multifunction Composite Gadget
echo 0x0100 > bcdDevice # v1.0.0
echo 0x0200 > bcdUSB # USB2

echo 0xEF   > bDeviceClass
echo 0x02   > bDeviceSubClass
echo 0x01   > bDeviceProtocol

mkdir -p strings/0x409
echo "Ikestrom"          > strings/0x409/manufacturer
echo "RPiZ Loopback Cam" > strings/0x409/product
echo "0123456789"        > strings/0x409/serialnumber

mkdir -p configs/c.1
# echo "0x80" > configs/c.1/bmAttributes
echo "500"  > configs/c.1/MaxPower
mkdir -p configs/c.1/strings/0x409
echo "UVC Config" > configs/c.1/strings/0x409/configuration

# Create UVC Functions

mkdir -p functions/uvc.usb0

create_function() {
	# Example usage:
	# create_function <width> <height> <format> <name>

	WIDTH=$1
	HEIGHT=$2
	FORMAT=$3
	NAME=$4

	wdir=functions/uvc.usb0/streaming/$FORMAT/$NAME/${HEIGHT}p

	mkdir -p $wdir
	echo $WIDTH  > $wdir/wWidth
	echo $HEIGHT > $wdir/wHeight
	echo 29491200 > $wdir/dwMinBitRate
	echo 29491200 > $wdir/dwMaxBitRate
	echo $(( $WIDTH * $HEIGHT * 2 )) > $wdir/dwMaxVideoFrameBufferSize
	# dwFrameInterfal is in 100-ns units (fps = 1/(dwFrameInterval * 10000000))
	# 333333 -> 30 fps
	# 666666 -> 15 fps
	# 5000000 -> 2 fps
	cat <<EOF > $wdir/dwFrameInterval
333333
666666
5000000
EOF
}

# create_function 320 180 uncompressed u
# create_function 640 360 uncompressed u
create_function 1280 720 uncompressed u
# create_function 1920 1080 uncompressed u
# create_function 320 180 mjpeg m
# create_function 640 360 mjpeg m
# create_function 1280 720 mjpeg m
# create_function 1920 1080 mjpeg m

mkdir -p functions/uvc.usb0/streaming/header/h
cd functions/uvc.usb0/streaming/header/h
ln -s ../../uncompressed/u
# ln -s ../../mjpeg/m
cd ../../class/fs
ln -s ../../header/h
cd ../../class/hs
ln -s ../../header/h

cd ../../../control
mkdir -p header/h
ln -s header/h class/fs
ln -s header/h class/ss
cd ../../../

# Set the packet size: uvc gadget max size is 3k...
# echo 3072 > functions/uvc.usb0/streaming_maxpacket
echo 2048 > functions/uvc.usb0/streaming_maxpacket
# echo 1024 > functions/uvc.usb0/streaming_maxpacket

ln -s functions/uvc.usb0   configs/c.1

echo `ls /sys/class/udc` > UDC