UVC ConfigFS Gadget configuration tool

uvc-gadget.sh

#!/bin/sh

set -e
#set -x

CONFIGFS="/sys/kernel/config"
GADGET="$CONFIGFS/usb_gadget"
VID="0x0525"
PID="0xa4a2"
SERIAL="0123456789"
MANUF=$(hostname)
PRODUCT="UVC Gadget"

USBFILE=/root/usbstorage.img

BOARD=$(strings /proc/device-tree/model)

case $BOARD in
	"Renesas Salvator-X board based on r8a7795 ES1.x")
		UDC_USB2=e6590000.usb
		UDC_USB3=ee020000.usb

		UDC_ROLE2=/sys/devices/platform/soc/ee080200.usb-phy/role
		UDC_ROLE2=/dev/null #Not needed - always peripheral
		UDC_ROLE3=/sys/devices/platform/soc/ee020000.usb/role

		UDC=$UDC_USB2
		UDC_ROLE=$UDC_ROLE2
		;;

	"TI OMAP4 PandaBoard-ES")
		UDC=`ls /sys/class/udc` # Should be musb-hdrc.0.auto
		UDC_ROLE=/dev/null # Not needed - peripheral enabled
		;;

	*)
		UDC=`ls /sys/class/udc` # will identify the 'first' UDC
		UDC_ROLE=/dev/null # Not generic
		;;
esac

echo "Detecting platform:"
echo "  board : $BOARD"
echo "  udc   : $UDC"     

create_msd() {
	# Example usage:
	#	create_msd <target config> <function name> <image file>
       	#	create_msd configs/c.1 mass_storage.0 /root/backing.img
	CONFIG=$1
	FUNCTION=$2
	BACKING_STORE=$3

	if [ ! -f $BACKING_STORE ]
	then
        	echo "\tCreating backing file"
        	dd if=/dev/zero of=$BACKING_STORE bs=1M count=32 > /dev/null 2>&1
	        mkfs.ext4 $USBFILE > /dev/null 2>&1
        	echo "\tOK"
	fi

        echo "\tCreating MSD gadget functionality"
        mkdir functions/$FUNCTION
        echo 1 > functions/$FUNCTION/stall
        echo $BACKING_STORE > functions/$FUNCTION/lun.0/file
        echo 1 > functions/$FUNCTION/lun.0/removable
        echo 0 > functions/$FUNCTION/lun.0/cdrom

        ln -s functions/$FUNCTION configs/c.1

        echo "\tOK"
}

delete_msd() {
	# Example usage:
	#	delete_msd <target config> <function name>
       	#	delete_msd config/c.1 uvc.0
	CONFIG=$1
	FUNCTION=$2

        echo "Removing Mass Storage interface : $FUNCTION"
        rm -f $CONFIG/$FUNCTION
        rmdir functions/$FUNCTION
        echo "OK"
}

create_uvc() {
	# Example usage:
	#	create_uvc <target config> <function name>
       	#	create_uvc config/c.1 uvc.0
	CONFIG=$1
	FUNCTION=$2

        echo "	Creating UVC gadget functionality : $FUNCTION"
        mkdir functions/$FUNCTION
	mkdir -p functions/$FUNCTION/streaming/uncompressed/u/360p
	cat <<EOF > functions/$FUNCTION/streaming/uncompressed/u/360p/dwFrameInterval
666666
1000000
5000000
EOF
	mkdir functions/$FUNCTION/streaming/header/h
	cd functions/$FUNCTION/streaming/header/h
	ln -s ../../uncompressed/u
	cd ../../class/fs
	ln -s ../../header/h
	cd ../../class/hs
	ln -s ../../header/h
	cd ../../../control
	mkdir header/h
	ln -s header/h class/fs
	ln -s header/h class/ss
	cd ../../../
	echo 2048 > functions/$FUNCTION/streaming_maxpacket

	ln -s functions/$FUNCTION configs/c.1
}

delete_uvc() {
	# Example usage:
	#	delete_uvc <target config> <function name>
       	#	delete_uvc config/c.1 uvc.0
	CONFIG=$1
	FUNCTION=$2

        echo "	Deleting UVC gadget functionality : $FUNCTION"
	rm $CONFIG/$FUNCTION

	rm functions/$FUNCTION/control/class/*/h
	rm functions/$FUNCTION/streaming/class/*/h
	rm functions/$FUNCTION/streaming/header/h/u
	rmdir functions/$FUNCTION/streaming/uncompressed/u/360p
	rmdir functions/$FUNCTION/streaming/uncompressed/u
	rmdir functions/$FUNCTION/streaming/header/h
	rmdir functions/$FUNCTION/control/header/h
	rmdir functions/$FUNCTION
}

case "$1" in
    start)
        echo "Creating the USB gadget"
        #echo "Loading composite module"
        #modprobe libcomposite

        echo "Creating gadget directory g1"
        mkdir -p $GADGET/g1

        cd $GADGET/g1
        if [ $? -ne 0 ]; then
            echo "Error creating usb gadget in configfs"
            exit 1;
        else
            echo "OK"
        fi

	echo "Setting Vendor and Product ID's"
        echo $VID > idVendor
        echo $PID > idProduct
        echo "OK"

        echo "Setting English strings"
        mkdir -p strings/0x409
        echo $SERIAL > strings/0x409/serialnumber
        echo $MANUF > strings/0x409/manufacturer
        echo $PRODUCT > strings/0x409/product
        echo "OK"

	echo "Creating Config"
        mkdir configs/c.1
        mkdir configs/c.1/strings/0x409

        echo "Creating functions..."
	#create_msd configs/c.1 mass_storage.0 $USBFILE
	create_uvc configs/c.1 uvc.0
        echo "OK"


        echo "Binding USB Device Controller"
	echo $UDC > UDC
	echo peripheral > $UDC_ROLE
	cat $UDC_ROLE
        echo "OK"
        ;;

    stop)
        echo "Stopping the USB gadget"

	set +e # Ignore all errors here on a best effort

        cd $GADGET/g1

        if [ $? -ne 0 ]; then
            echo "Error: no configfs gadget found" 
            exit 1;
        fi

        echo "Unbinding USB Device Controller"
        grep $UDC UDC && echo "" > UDC
        echo "OK"

	delete_uvc configs/c.1 uvc.0
	#delete_msd configs/c.1 mass_storage.0

	echo "Clearing English strings"
        rmdir strings/0x409
        echo "OK"

        echo "Cleaning up configuration"
        rmdir configs/c.1/strings/0x409
        rmdir configs/c.1
        echo "OK"

        echo "Removing gadget directory"
        cd $GADGET
        rmdir g1
        cd /
        echo "OK"

        #echo "Disable composite USB gadgets"
        #modprobe -r libcomposite
        #echo "OK"
        ;;
    *)
        echo "Usage : $0 {start|stop}"
esac

This is not a support forum. Please use https://gitlab.freedesktop.org/camera/uvc-gadget/