Re: [PATCH 1/7 v3] HID: magicmouse: don't allow hidinput toinitialize the device

[Michael Poole]

Jiri Slaby wrote:
> This looks weird. Is there any past discussion about why you cannot use
> hidinput and you have to do all the input bits yourself while cheating
> this very weird way?

(Resending because I didn't notice Gmail was in "rich text" mode, and
that kept my earlier message from reaching the vger lists.  Apologies
to the individuals who get a second copy of this message.)

The Magic Mouse and Magic Trackpad do not publish HID descriptors for
the multitouch reports.  Given the variable-length report packets --
and especially the Magic Trackpad's new, mutant DOUBLE_REPORT_ID
packets -- it would be non-trivial to write accurate descriptors that
the HID core can use.  (Someone wrote a patch to try that a few months
ago.  It ended up adding significantly more lines to hid-magicmouse.c
than it removed, and it was not obvious to me that it got the Report
Count fields correct.)

Michael Poole
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/