linux-kernel - Re: [PATCH] Map volume and brightness events on thinkpads

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Message-ID: <20071018223915.GA4483@khazad-dum.debian.net>
Date:	Thu, 18 Oct 2007 20:39:15 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Katz <katzj@...hat.com>, linux-kernel@...r.kernel.org,
	davej@...hat.com
Subject: Re: [PATCH] Map volume and brightness events on thinkpads

On Thu, 18 Oct 2007, Dmitry Torokhov wrote:
> On 10/17/07, Henrique de Moraes Holschuh <hmh@....eng.br> wrote:
> > Still, I was
> > thinking about it, and a doubt came to mind: would it cause problems for a
> > bitmap to share the function for EV_foo and EV_foo notifications?
> 
> Not sure if I follow... Are you talking about bringing KEY_*_NOTIFY
> into EV_KEY "namespace"? Could you elaborate?

Suppose we define a "EV_* is a notify event" bit to set in the event type
field of an input event.

Now, any type of event can be a notify event or a normal event, depending on
wether this bit is set.

However, the input layer keeps track of which events of a given type can be
sent by an input device using bitmaps, for every type of event.  And this
bitmap now would mean "input device may issue a normal event or a notify
event", not just "input device may issue a normal event".

I am not sure if that would cause trouble?

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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