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Linux/TDA2EVM5777: usb: uvc + configfs + gadget -> uvc usb gadget failed to hot plug in host side

Ganesh Biradar
Expert 2315 points

Part Number: TDA2EVM5777

Tool/software: Linux

Hi Guys,

I'm working on TDA2EX EVM board with 4.4 kernel which is part of vision_sdk_02_12.

i'm trying to implement usb uvc gadget using configfs.

EVM board as usb webcam(device) -------------------------> HOST PC.

i have set usb as dr_mode = "otg" in dts file. and passing these parameters

# mount -t debugfs debugfs /mnt/
# echo "device" > /mnt/488d0000/mode
# cat /mnt/488d0000/mode
OTG
# modprobe configfs
# modprobe libcomposite
# cd /sys/kernel/config/usb_gadget
# mkdir g1
# cd g1
# echo "0xA55A" > idVendor
# cat idVendor
# echo "0x0111" > idProduct
# mkdir strings/0x409
# cd strings/
# cd 0x409/
# echo "0123456789" > serialnumber
# echo "Xyz Inc." > manufacturer
# echo "webcam" > product
# cd ../../
# modprobe usb_f_uvc
# mkdir functions/uvc.usb0
# mkdir configs/c.1
# mkdir configs/c.1/strings/0x409
# echo "Video" > configs/c.1/strings/0x409/configuration
# echo 120 > configs/c.1/MaxPower
# mkdir functions/uvc.usb0/control/header/h
# cd functions/uvc.usb0/control/
# ln -s header/h class/fs
# ln -s header/h class/ss
# cd ../../../
# mkdir -p functions/uvc.usb0/streaming/uncompressed/u/360p
# cat <<EOF > functions/uvc.usb0/streaming/uncompressed/u/360p/dwFrameInterval
> 666666
> 1000000
> 5000000
> EOF
# mkdir functions/uvc.usb0/streaming/header/h
# cd functions/uvc.usb0/streaming/header/h
# ln -s ../../uncompressed/u
# cd ../../class/fs
# ln -s ../../header/h
# cd ../../class/hs
# ln -s ../../header/h
# cd ../../../control
# cd ../../../
# ln -s functions/uvc.usb0 configs/c.1/
# echo "488d0000.usb" > UDC

after these i'm getting these message.

[   41.557509] configfs-gadget gadget: uvc_function_bind
[   41.592097] dwc3 488d0000.usb: otg: gadget gadget registered

but when i connect device to host PC. i'm not getting any enumeration as expected in usb hotplug device.

In host PC, their is no information whether any usb device connected.

i have posted in TDA2EX ADAS forum of e2e but they inform that they have not tested these that's why i'm posting here in linux community.

if anyone can tell what can be the problem. to confirm USB port is working or not i have tested with usb mass storage which is working fine.

regards,

Ganesh