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

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Date:	Mon, 13 Dec 2010 09:00:25 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
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 12/13/2010 03:50 AM, Dmitry Torokhov wrote:

> 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?


I agree - let's put the bar at four fingers for special solutions. Dropped.

Thanks,
Henrik
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