linux-kernel - Re: [PATCH 2/2] input: mt: Add button support for five fingers

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Message-ID: <20101213025016.GC21401@core.coreip.homeip.net>
Date:	Sun, 12 Dec 2010 18:50:16 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Jiri Kosina <jkosina@...e.cz>, Ping Cheng <pingc@...om.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] input: mt: Add button support for five fingers

On Sat, Dec 11, 2010 at 11:28:28AM +0100, Henrik Rydberg wrote:
> This patch adds BTN_TOOL_QUINTAP to be used by hardware reporting
> finger counts different from the number of MT contacts.

I must say this is quite ugly, but so is introducing ABS_CONTACT_COUNT
or similar, except that the latter is more extensible so if
manufacturers decide to report 6, 7, 8 fingers (but not their
coordinates) we won't have to breed BTN_TOOL_xxxTAPs...

But let me ask you this: do we know what to do with 5 fingers? How do we
plan to react to such gestures? Maybe the best option is simply ignore
it and don't report anything if there are no userspace consumers?

Thanks.

-- 
Dmitry
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