Related to this older thread, I'm also trying to get uvc-gadget to work, on a J784S4XEVM this time. My script is listed below.
#! /bin/sh
GADGET_DIR="/sys/kernel/config/usb_gadget"
GADGET_NAME="uvc_gadget"
LANGUAGE=0x409
VENDOR_ID=0x1d6b #Linux Foundation
PRODUCT_ID=0x0104 #Multifunction composite gadget
SERIAL="0123456789"
MANUFACTURER="Acme"
PRODUCT="Testing123"
CONFIGNAME="c"
CONFIGNUM=1
CONFIGURATION="UVC"
MAXPOWER=500
FUNCTION="uvc"
FUNCTION_ID="usb0"
MAX_SPEED="high-speed"
create_frame() {
# Example usage:
# create_frame <width> <height> <group> <format name>
WIDTH=$1
HEIGHT=$2
FORMAT=$3
NAME=$4
wdir=$GADGET_DIR/$GADGET_NAME/functions/$FUNCTION.$FUNCTION_ID/streaming/$FORMAT/$NAME/${HEIGHT}p
mkdir -p $wdir
echo $WIDTH > $wdir/wWidth
echo $HEIGHT > $wdir/wHeight
echo $(( $WIDTH * $HEIGHT * 2 )) > $wdir/dwMaxVideoFrameBufferSize
cat <<EOF > $wdir/dwFrameInterval
666666
100000
5000000
EOF
}
modprobe libcomposite
mkdir $GADGET_DIR/$GADGET_NAME
cd $GADGET_DIR/$GADGET_NAME
echo $VENDOR_ID > idVendor
echo $PRODUCT_ID > idProduct
echo $MAX_SPEED > max_speed
mkdir strings/$LANGUAGE
echo $MANUFACTURER > strings/$LANGUAGE/manufacturer
echo $SERIAL > strings/$LANGUAGE/serialnumber
echo $PRODUCT > strings/$LANGUAGE/product
mkdir configs/$CONFIGNAME.$CONFIGNUM
mkdir configs/$CONFIGNAME.$CONFIGNUM/strings/$LANGUAGE
echo $MAXPOWER > configs/$CONFIGNAME.$CONFIGNUM/MaxPower
echo $CONFIGURATION > configs/$CONFIGNAME.$CONFIGNUM/strings/$LANGUAGE/configuration
mkdir $GADGET_DIR/$GADGET_NAME/functions/uvc.usb0
mkdir $GADGET_DIR/$GADGET_NAME/functions/acm.usb0
mkdir functions/uvc.usb0/control/header/h
ln -s functions/uvc.usb0/control/header/h functions/uvc.usb0/control/class/fs/h
create_frame 1280 720 mjpeg mjpeg
create_frame 1920 1080 mjpeg mjpeg
mkdir functions/uvc.usb0/streaming/header/h
cd $GADGET_DIR/$GADGET_NAME/functions/uvc.usb0/streaming/header/h
ln -s ../../mjpeg/mjpeg
cd ../../class/fs
ln -s ../../header/h
cd ../../class/hs
ln -s ../../header/h
cd $GADGET_DIR/$GADGET_NAME
ln -s functions/uvc.usb0 configs/c.1
ln -s functions/acm.usb0 configs/c.1
ls /sys/class/udc > $GADGET_DIR/$GADGET_NAME/UDC
When I try to link the UDC device to the uvc_gadget in configfs I get these errors:
[ 53.427774] udc 6000000.usb: binding gadget driver [uvc_gadget] [ 53.433747] configfs-gadget.uvc_gadget gadget.0: adding 'uvc'/000000003ec1e969 to config 'c'/00000000dbcd99c2 [ 53.443652] configfs-gadget.uvc_gadget gadget.0: uvc: uvc_function_bind() [ 53.450441] configfs-gadget.uvc_gadget gadget.0: adding 'uvc'/000000003ec1e969 --> -19 [ 53.458351] udc 6000000.usb: failed to start uvc_gadget: -19 [ 53.464051] UDC core: uvc_gadget: couldn't find an available UDC or it's busy ls: write error: Device or resource busy
I'm using SDK 09.01, does the USB driver fully support UDC at this stage?
Thanks,
Simon
