[Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339

--- Comment #15 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Greg V from comment #12)
> I think I found the culprit, it's the length retrieval in get_input_report. I changed it to just trust the given length — touchscreen works,
That sounds strange. Length retrieval breaks read pipelining, but I dont think
it can result in such an errors.

> err, actually, it's the thing where it writes the wInputRegister, which I don't think is supposed to happen.
Write into wInputRegister can't result in any immediate errors as it is just a
write into controller's FIFO.

// and it's currently reading mouse reports.. I'll try to fix this.
imt_set_input_mode() is responsible for converting mouse to touchpad

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