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

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Message-ID: <AANLkTimTChXjbDL0NAxoNu-Ld7AGDezfsvIHwjKuKt1A@mail.gmail.com>
Date:	Sun, 23 May 2010 23:07:27 -0700
From:	Ping Cheng <pinglinux@...il.com>
To:	Peter Hutterer <peter.hutterer@...-t.net>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	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)

On Sun, May 23, 2010 at 9:58 PM, Peter Hutterer
<peter.hutterer@...-t.net> wrote:
>> > And yes, you could add it once we find it's an issue, but by then someone
>> > has already spent time to work around this. And when you then start sending
>> > slot events all the time, you admit that writing the workaround was just a
>> > time waster :)
>>
>> Work around what, exactly?
>
> I was referring to having a protocol where processes has to ignore contacts
> already down until they've been there when a contact was pressed (and your
> comment that if this becomes an issue it could be added lateron).
> Now, the ignoring part needs to be written (this is the "workaround"
> referred to above). if you're planning to add it later, we need to cater for
> that part as well then, having two implementations depending on the kernel
> versions.
>
> but this is just for clarification, it's a moot point anyway given that
> button events have the same behaviour.

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 :(.

Ping
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