linux-kernel - Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev2)

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Message-ID: <AANLkTikwc2fEL_oTzpLtEBM-z8CPymqzIxVoebanT3ih@mail.gmail.com>
Date:	Thu, 20 May 2010 20:35:42 -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 (rev2)

On Thu, May 20, 2010 at 3:48 PM, Henrik Rydberg <rydberg@...omail.se> wrote:
>> I need double check with you although I think I know the answer. From
>> your explanation and examples so far, I see MT_SLOT is only associated
>> with one (x,y). Is this true?  If yes, can we eliminate the
>> requirement for TRACKING_ID? If you think the requirement is
>> necessary, can you give me an example where missing the TRACKING_ID
>> would bring issue or confusion?
>
> Yes, each slot can only be associated with one (x, y) pair. No, we cannot
> disregard the tracking id. A slot tracks a single contact for its entire
> lifetime, during which the tracking id serves no purpose, but the slot cannot
> tell us when the contact is replaced by a new one. This information is carried
> by the tracking id.

Ok, I've made enough noise in this thread. If we change SYN_MT_SLOT to
ABS_MT_SLOT_ID (or something starting with ABS_ of your choice), I
have no more questions.

You can put my reviewed-by in the patch if that counts for anything:

Reviewed-by: Ping Cheng <pingc@...om.com>

Ping
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