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I am trying to find a generic way for Linux to recognize my custom touchscreen driver without using xinput / xorg config. I'm not certain what Linux system the customer will be using, but I can be certain of a fixed com port such as ttyS0.

How does Linux recognize the touchscreen device and attach to the device ttyS0 if not using Xorg / xinput? Or do all Linux OS with a UI use Xorg?

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  • To answer your last question, Xorg is not what all Linux installations use. There are alternatives available, with the most popular being Wayland Feb 1, 2018 at 16:52
  • Sounds like a job for inputattach... Feb 1, 2018 at 16:58
  • Stephen - Is it possible to add a custom driver to inputattach? I only saw the drivers that inputattach already came with. Thanks.
    – OtterFox
    Feb 1, 2018 at 17:02
  • Yes, you can add a custom driver, as long as you have a matching line discipline in the kernel. The way it usually happens is that people send me a patch (or rather, [email protected]) and I merge it and release a new version. Feb 1, 2018 at 17:06
  • I can't unfortunately release it to the community as it's using a proprietary interface that we had to sign a NDA for. So would Xorg be the better option in this case?
    – OtterFox
    Feb 1, 2018 at 17:07

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To solve this, I added my device to the array of 'struct input_types' within inputattach.c. This source file I had to find online. After adding the correct parameters to this list and recompiling, I was then able to start my driver running my own built inputattach file: ./myInputAttach -mydriver /dev/ttyUSB0

Running a tail -f /var/log/kern.log shows "printk" output from the driver starting and the interrupts.

I still do not see the driver on xinput, but this at least solves the issue of the driver not being used.

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