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Subject: Re: Setkeycodes w/ keycode >= 0x100 ?
Date: Fri, 3 Mar 2006 13:39:42 -0500
Message-ID: <Pine.LNX.4.61.0603031322410.18198@chaos.analogic.com>
Thread-Topic: Setkeycodes w/ keycode >= 0x100 ?
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References: <Pine.LNX.4.64.0603031241130.15776@light.int.webcon.net>
From: "linux-os \(Dick Johnson\)" <linux-os@analogic.com>
To: "Ian E. Morgan" <imorgan@webcon.ca>
Cc: "Linux kernel" <linux-kernel@vger.kernel.org>
Reply-To: "linux-os \(Dick Johnson\)" <linux-os@analogic.com>
Sender: linux-kernel-owner@vger.kernel.org
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On Fri, 3 Mar 2006, Ian E. Morgan wrote:

> Since my HP notebook has some unrecognized keys, I have to use setkeycodes to
> make the kernel recognise them. However, many of the basic (<=255) KEY's from
> input.h are not suitable, but newer ones (>=0x100) woule be perfect.
>
> Any idea how to map scancodes to keycodes >=0x100 when setkeycodes won't
> accept hex input nor anything greater than 255?
>
> Regards,
> Ian Morgan

The keyboard controller generates scan-codes from 0 to 255.
It reads the scan-code information from a byte-wide port
(so-called PORT_A in the PC/AT), so it can't be any larger
than a byte. The controller provides a code when the key
is pressed and another code when the key is released. The
only difference between these codes is a single bit.
This limits the number of possible different scan codes
to 127.

The scan-codes are translated, based upon the Caps Lock, the
Ctrl key, the Alt key, and the Shift key so, in principle,
you could have almost 4 times as many keyboard symbols as
scan-codes. However, you would have to rewrite a lot of
keyboard code to take advantage of this.

>
> --
> -------------------------------------------------------------------
> Ian E. Morgan          Vice President & C.O.O.       Webcon, Inc.
> imorgan at webcon dot ca       PGP: #2DA40D07       www.webcon.ca
>    *  Customized Linux Network Solutions for your Business  *
> -------------------------------------------------------------------

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.54 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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