linux-kernel - Re: [PATCH 1/7 v3] HID: magicmouse: don't allow hidinput to initialize the device

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Date:	Wed, 1 Sep 2010 19:57:25 -0400
From:	Michael Poole <mdpoole@...ilus.org>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Chase Douglas <chase.douglas@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Henrik Rydberg <rydberg@...omail.se>,
	Tejun Heo <tj@...nel.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7 v3] HID: magicmouse: don't allow hidinput to
 initialize the device

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The Magic Mouse and Magic Trackpad do not publish HID descriptors for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
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