From mboxrd@z Thu Jan  1 00:00:00 1970
From: Henrik Rydberg <rydberg@euromail.se>
Subject: Re: [PATCH 2/2] input: mt: Document the MT event slot protocol (rev2)
Date: Mon, 24 May 2010 12:03:52 +0200
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To: Ping Cheng <pinglinux@gmail.com>
Cc: Peter Hutterer <peter.hutterer@who-t.net>, 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>, Benjamin Tissoires <tissoire@cena.fr>, Stephane Chatty <chatty@enac.fr>, Rafi Rubin <rafi@seas.upenn.edu>, Michael Poole <mdpoole@troilus.org>

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