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

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Date:	Mon, 24 May 2010 10:33:05 -0700
From:	Ping Cheng <pinglinux@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Peter Hutterer <peter.hutterer@...-t.net>,
	Henrik Rydberg <rydberg@...omail.se>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mika Kuoppala <mika.kuoppala@...ia.com>,
	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 Mon, May 24, 2010 at 10:21 AM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Monday 24 May 2010 10:06:15 am Ping Cheng wrote:
>> >> This topic is outside of the _MT_ protocol discussion.
>> >>
>> >> However, it is indeed an issue with all filtered input events, both
>> >> for MT and regular ones.
>> >>
>> >> I think we need to add an ioctl to enable user land driver/client to
>> >> signal the kernel driver to send all events without filtering, just
>> >> once. Hot-plugged devices and X driver starts after user has contacted
>> >> with the device are two examples that the client would miss filtered
>> >> events.
>> >>
>> >> Dmitry, do you think it is a valid suggestion?
>> >
>> > What about using EVIOCGKEY/EVIOCGSW/EVIOCGABS?
>>
>> Those EVIOCs only give us the static values (max/min/supported keys,
>> etc.).  We need their dynamic input data here, the actual x, y,
>> button, pressure, etc. Am I missing something about those EVIOs?
>>
>
> Yes you are ;) Supported events are reported via EVIOCGBIT, EVIOCGKEY and
> EVIOCGSW will return current state of keys/switches. As far as EVIOCGABS
> goes, it also returns, besides min/max/etc, last reported _values_ of the
> ABS_* events.

Oh, My God! I should have listened to Mark Twain :).

Ping
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