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

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Message-ID: <4BFABBD0.9020202@euromail.se>
Date:	Mon, 24 May 2010 19:48:00 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Ping Cheng <pinglinux@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	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)

Dmitry Torokhov wrote:
[...]
>>>> 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.
> 

Ping is not alone. :-)

But it does not work for MT events -- yet.

Henrik

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