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Date: Thu, 20 May 2010 20:35:42 -0700
Message-ID: <AANLkTikwc2fEL_oTzpLtEBM-z8CPymqzIxVoebanT3ih@mail.gmail.com>
Subject: Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev2)
From: Ping Cheng <pinglinux@gmail.com>
To: Henrik Rydberg <rydberg@euromail.se>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>, linux-input@vger.kernel.org,
       linux-kernel@vger.kernel.org, Mika Kuoppala <mika.kuoppala@nokia.com>,
       Peter Hutterer <peter.hutterer@who-t.net>,
       Benjamin Tissoires <tissoire@cena.fr>, Stephane Chatty <chatty@enac.fr>,
       Rafi Rubin <rafi@seas.upenn.edu>, Michael Poole <mdpoole@troilus.org>
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On Thu, May 20, 2010 at 3:48 PM, Henrik Rydberg <rydberg@euromail.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@wacom.com>

Ping