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

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Message-ID: <AANLkTikzH7IscIAYGNw00fjXSYJosaaAsbUArt9M7wfJ@mail.gmail.com>
Date:	Fri, 21 May 2010 20:52:31 -0700
From:	Ping Cheng <pinglinux@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Dmitry Torokhov <dmitry.torokhov@...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>,
	Rafi Rubin <rafi@...s.upenn.edu>,
	Michael Poole <mdpoole@...ilus.org>
Subject: Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev3)

On Fri, May 21, 2010 at 10:49 AM, Henrik Rydberg <rydberg@...omail.se> wrote:
> Dmitry Torokhov wrote:
>>
>> I guess this is where our disconnect lies as when I am looking at the
>> event names I view all *_MT_* events as related to the multitouch
>> protocol handling.
>>
>
> Yes. It is true that slot control is MT related, but I am looking at this from
> the perspective of future expansions like KEY_MT,  KEY_REL, and such, finding a
> way to signal to user space which events are handled via slots. If we had
> ABS_MT_SLOT, we would most likely get applications which store ABS_MT_SLOT as an
> attribute of the slot together with ABS_MT_POSITION_X, ABS_MT_TOUCH_MAJOR, etc,
> which is just not right.

Why is it not right?  Do you mean ABS_SLOT can be used as a label for
both _MT_ and non _MT_ events while ABS_MT_SLOT can not?

> So the proposal is ABS_SLOT.

I haven't convinced myself with this proposal yet. Can you explain the
difference between ABS_SLOT and ABS_MT_SLOT with a concrete example?
Fool always ignores Mark Twain's advice, you know :).

Ping
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