linux-kernel - Re: [RESEND] [PATCH] Input: add appleir USB driver

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Message-ID: <20101005161826.GE19730@core.coreip.homeip.net>
Date:	Tue, 5 Oct 2010 09:18:26 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Bastien Nocera <hadess@...ess.net>,
	linux-input <linux-input@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] [PATCH] Input: add appleir USB driver

On Tue, Oct 05, 2010 at 06:07:36PM +0200, Oliver Neukum wrote:
> Am Dienstag, 5. Oktober 2010, 17:55:52 schrieb Dmitry Torokhov:
> > > Yes, but based on sane timing. From the time stamps user space
> > > would conclude that the key had been pressed at an unknown time
> > > before open and released at the time the event indicates. Possibly
> > > it would compute that the key had been held for at least hours.
> > > 
> > 
> > I do not understand. If a client never seen the "press" event and only
> > saw "release" event it can't make any assumptions about timing. Press
> > could be a millisecond ago or an hour ago, it just does not know. And
> > such scenario can easily happen if the client is second to open the
> > device.
> 
> As soon as you open a device you see key presses. If you see a release
> without a press, the press must have happened before you opened.
> So if you know when you opened and when a key is released, you'll
> have a lower limit on how long the key must have been held down.
> 

Yes. I still do not see the usefulness of this data.

-- 
Dmitry
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