linux-kernel - Re: Proposal: change keycode for scancode e0 32 from 150 to 172

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Message-ID: <Pine.LNX.4.64.0706131113400.23280@twin.jikos.cz>
Date:	Wed, 13 Jun 2007 11:18:03 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Hans de Goede <j.w.r.degoede@....nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stanislav Brabec <sbrabec@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>
Subject: Re: Proposal: change keycode for scancode e0 32 from 150 to 172

On Tue, 12 Jun 2007, H. Peter Anvin wrote:

> In PS/2 mode it reports E0 32 which gets converted to keycode 150. In 
> USB mode it reports E0 02 which gets converted to keycode 172.
> I don't know if it's the keyboard itself that's being inconsistent, or 
> if it is the table in usbkbd.c that's broken (in which case it should be 
> fixed to be consistent with the keyboard in PS/2 mode.)

Hi Peter,

First, usbkbd.c has very probably zero business with this - the mappings 
are being done in hid-input.c, usbkdb.c is only for embedded/debugging 
cases, and is almost never used on modern systems (see the corresponding 
Kconfig help text).

> You seem to be of the opinion that "usb behaviour is correct", but don't 
> give any motivation why usb should take precedence.  Offhand, I would 
> expect there to be fewer translation layers for PS/2 and would therefore 
> assume PS/2 is more inherently correct.

For USB, we have Hid Usage Pages, which define this to be KEY_HOMEPAGE. 
There is no such specification for PS/2 though, so what Hans is proposing 
is to make it consistent with behavior of USB HID devices, which I agree 
with.

-- 
Jiri Kosina
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