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

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Message-ID: <4BFA4F08.5010700@euromail.se>
Date:	Mon, 24 May 2010 12:03:52 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Ping Cheng <pinglinux@...il.com>
CC:	Peter Hutterer <peter.hutterer@...-t.net>,
	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>,
	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)

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?
> 
> I've had this issue for ages (but never had time to work on it :(.

It would be easy to initialize a catch-up when opening the device for a new
client (evdev_open()).

Henrik

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