From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH 6/6] Input: ALPS - mix trackstick and external PS/2 mouse data Date: Thu, 15 Jan 2015 13:00:30 -0800 Message-ID: <20150115210030.GB19367@dtor-ws> References: <1421276154-8689-1-git-send-email-dmitry.torokhov@gmail.com> <1421276154-8689-7-git-send-email-dmitry.torokhov@gmail.com> <201501152134.51503@pali> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-ie0-f171.google.com ([209.85.223.171]:40935 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751566AbbAOVAe (ORCPT ); Thu, 15 Jan 2015 16:00:34 -0500 Received: by mail-ie0-f171.google.com with SMTP id ar1so17299916iec.2 for ; Thu, 15 Jan 2015 13:00:34 -0800 (PST) Content-Disposition: inline In-Reply-To: <201501152134.51503@pali> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: linux-input@vger.kernel.org, Yunkang Tang , Hans de Goede On Thu, Jan 15, 2015 at 09:34:51PM +0100, Pali Roh=E1r wrote: > On Wednesday 14 January 2015 23:55:54 Dmitry Torokhov wrote: > > From: Pali Roh=E1r > >=20 > > Previously dev2 device was used for both external PS/2 mouse > > and internal trackstick device (if available). This change > > introduces dev3 device which is used for external PS/2 mouse > > data and dev2 is now used only for trackstick. > >=20 > > In case that trackstick is not present dev2 is not created, so > > userspace does not see non existent device in system. > >=20 > > Because laptops with ALPS devices often do not use i8042 > > active multiplexing all data (from touchpad, trackstick and > > external PS/2 mouse) come to one port. So it is not possible > > to know if external PS/2 mouse is connected or not. In most > > cases external PS/2 mouse is not connected so driver will > > create dev3 input device after first bare PS/2 packet will be > > received. So there will not be "ghost" input device. > >=20 > > This change also helps in identifying possible problems in > > future if driver decides to report 6-bytes trackstick packets > > as 3-bytes bare PS/2 (data will be reported to dev3 instead > > dev2). > >=20 > > Signed-off-by: Pali Roh=E1r > > Signed-off-by: Dmitry Torokhov >=20 > Subject should be: "do *not* mix" or "prevent mix" Right, I'll adjust it. --=20 Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" = in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html