[Bug 221074] Hyper V Gen 2 install has no mouse

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221074

--- Comment #16 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Dexuan Cui from comment #15)
> I'm just not familiar with the HID part.
And I am not familiar with VMbus :-)

> IIRC, for every mouse event, the Hyper-V host sends
> a 7-byte "input_report", which in Linux VM is handled
> by the Linux HID API hid_input_report() and nothing else is done.
> In FreeBSD, I'm not sure what the equivalent API is?

intr_handler callback sends input report body to upper layers. See e.g. iichid
driver:
https://github.com/freebsd/freebsd-src/blob/main/sys/dev/iicbus/iichid.c#L583.
The callback is registered with intr_setup method
https://github.com/freebsd/freebsd-src/blob/main/sys/dev/hid/hid_if.m#L50.

> I suppose the format of the 7 bytes from the Hyper-V host
> should comply with the HID spec for mouse
As it is not a boot protocol which takes only 3 bytes, it should be prescribed
in HID report descriptor. I think it lies in one of the Linux header files.

> I guess Wei (whu) on our team can help on this, and also review the 2 kbd patches.
That would be great! Thanks! If someone familiar with VMbus would write driver
capable to just print these 7 bytes, I would easily connect it to our HID API.

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