linux-kernel - Re: [PATCH 0/2] wistron

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Date:	Wed, 14 Mar 2007 20:02:54 +0100
From:	Vojtech Pavlik <vojtech@...e.cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Eric Piel <Eric.Piel@...mplin-utc.net>, mitr@...ny.cz,
	otauber@....de, linux-kernel@...r.kernel.org,
	linux-input <linux-input@...ey.karlin.mff.cuni.cz>
Subject: Re: [PATCH 0/2] wistron_btns: More keymaps

On Wed, Mar 14, 2007 at 02:58:49PM -0400, Dmitry Torokhov wrote:

> >> I have couple of comments/requests:
> >>
> >> 1. KEY_OPEN and KEY_CLOSE should not be used to signal state of the
> >> lid, they correspond to Accpication Control Open and Close keys from
> >> USB HID HUT spec:
> >>
> >>     http://www.usb.org/developers/devclass_docs/Hut1_12.pdf
> >>
> >> SW_LID shoudl be used to signal lid state instead.
> >>
> >> 2. I also have a concern about using KEY_SCREEN to signal toggling
> >> display on and off. I am CCing Vojtech - he must know what the
> >> original intent of this key code was. BTW, when user presses
> >> corresponding button - does the display actually goes off? Maybe we
> >> need another switch.
> >
> >Sorry, Dmitry, I probably should have documented it back then, I don't
> >have the slightest idea anymore.
> >
> 
> That's what I was afraid of ;) Well, maybe we should just use it to
> indicate display switch and add a comment to that effect to input.h...

Digging somewhat deeper into my memory, I think it just so happened that
there was a keyboard with a key with a pictogram of a computer screen on
it with no really defined purpose. Since at that time there was only a
limited number of different extended keyboard types, it was added.

I think it'd make sense to use it eg. for the key that switches between
internal and external output on laptops, if the laptop generates a
keycode for the key at all. But maybe that function is already taken by
KEY_SWITCHVIDEOMODE ...

-- 
Vojtech Pavlik
Director SuSE Labs
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