USB HID Touch Screen detection with i.MX93-EVK

[nicolah]

Hello,

My i.MX93-EVK board does not detect the USB HID touchscreen.

I am using the T080a portable touch monitor, the touchscreen is connected via USB-C.

I built used the following build commands

repo init -u https://github.com/nxp-imx/imx-manifest -b imx-linux-mickledore -m imx-6.1.55-2.2.0.xml
repo sync
 
MACHINE=imx93evk DISTRO=fsl-imx-fb source imx-setup-release.sh -b build

bitbake imx-image-core

The device tree is fdtfile=imx93-11x11-evk.dtb

It seems the USB HID device is not even detected.

There is not even a log in dmesg when connecting the USB cable, so the device /dev/input/touchscreen0 is not created

root@imx93evk:~# ls  /dev/input/
by-path  event0  event1
root@imx93evk:~# lsusb
root@imx93evk:~#
root@imx93evk:~# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:      44440000.bbnsm:pwrkey
/dev/input/event1:      WM8962 Beep Generator
Select the device event number [0-1]: 

Could you provide a solution for this issue?

Thanks,

Nicolas

ps: the USB port is functional, a USB mouse on the same port is detected.

[Zhiming_Liu]

Hi

Please check your defconfig and enable all features about USB HID touch screen.

Best Regards
Zhiming

[nicolah · Accepted solution]

Actually we found a solution.

Apparently the kernel can only see a USB host device, and so when we used a combination of a USB-C to host cable from i.MX93-EVK to a USB-C male/male cable to the HDMI screen, then we could see /dev/input/touchscreen0 mounted by the kernel.