linux-kernel - Re: [PATCH v2] Input - mt: Fix input_mt_get_slot_by

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Date:	Thu, 23 Apr 2015 20:52:27 +0200
From:	Henrik Rydberg <rydberg@...math.org>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>
CC:	Jiri Kosina <jkosina@...e.cz>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Input - mt: Fix input_mt_get_slot_by_key

> My guess is that none of these drivers are
> able to handle a silent closing of a slot and the easiest solution might
> be to simply change the documentation if in fact nobody uses the
> compressed notation (which removes just one ABS_SLOT event within the
> frame, so not sure we can call it compressed BTW).

No, this is a very bad idea. As is obvious from the patch and the problem, there
are cases that the typical add/remove interface cannot handle, without either
adding more frames or support twice as many slots. How else would you report a
complete change of all N contacts into N new contacts, for instance?

The kernel protocol is solid and works for all cases. Userland thus has access
to a complete solution.

Henrik


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