linux-kernel - Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad

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Message-ID: <4E2F47C7.4060702@canonical.com>
Date:	Tue, 26 Jul 2011 16:03:35 -0700
From:	Chase Douglas <chase.douglas@...onical.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Daniel Kurtz <djkurtz@...omium.org>, rydberg@...omail.se,
	rubini@...l.unipv.it, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, derek.foreman@...labora.co.uk,
	daniel.stone@...labora.co.uk, olofj@...omium.org
Subject: Re: [PATCH 8/9 v2] Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers
 on touchpad

On 07/25/2011 11:16 AM, Dmitry Torokhov wrote:
> On Mon, Jul 25, 2011 at 05:14:22PM +0800, Daniel Kurtz wrote:
>> On Mon, Jul 25, 2011 at 4:29 PM, Dmitry Torokhov
>> <dmitry.torokhov@...il.com> wrote:
>>>
>>> On Wed, Jul 20, 2011 at 09:39:05PM +0800, djkurtz@...omium.org wrote:
>>>> From: Daniel Kurtz <djkurtz@...omium.org>
>>>>
>>>
>>> Do we know what we want to do with this gesture? Because if not I'd
>>> rather not merge it for now, until there are real users.
>>
>> And do what instead?
>> Report 5 fingers with BTN_TOOL_QUADTAP?
>>
> 
> That, or nothing... The fact that the device can report 5 finger touch
> does not mean that anybody cares about this.

The uTouch gesture stack supports up to 5 touch gestures, and although
most of them are either hard to do on a trackpad or are not possible
with this driver, I can think of uses for 5 finger tap. Unity uses four
finger tap quite effectively I believe.

There is a meaningful limit to this: five fingers on a human hand. It
seems more arbitrary to stick the protocol limit at four fingers.

-- Chase
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