linux-kernel - Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev3)

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Date:	Sat, 22 May 2010 19:47:18 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Chase Douglas <chase.douglas@...onical.com>
CC:	Rafi Rubin <rafi@...s.upenn.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Ping Cheng <pinglinux@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mika Kuoppala <mika.kuoppala@...ia.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	Benjamin Tissoires <tissoire@...a.fr>,
	Stephane Chatty <chatty@...c.fr>,
	Michael Poole <mdpoole@...ilus.org>
Subject: Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev3)

Chase Douglas wrote:
> On Sat, 2010-05-22 at 12:38 +0200, Henrik Rydberg wrote:
>> Getting serious, it is anyone's guess what will happen next, but I was picturing
>> a table, with a large multitouch screen and buttons along the side of the table.
>> Sure, we can do "ABS_BTN_0", "ABS_BTN_1", etc, but with slots in place, it seems
>> more natural to use something like "ABS_MT_BTN_X". While at it, REL_MT event
>> makes sense for those touchscreen techniques which register changes, like
>> acoustic pulse recognition.

s/ABS/KEY/

> 
> Shouldn't this be handled in userspace? I don't think we want to be
> quirking drivers for instances where the same touchscreen is overlaid on
> buttons in some cases, but not in others. If we don't quirk, we'd need
> some mechanism to tell the driver about such buttons.

Perhaps you would like to clarify what "this" means here, and how you arrive at
quirking drivers.

Henrik

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