From mboxrd@z Thu Jan 1 00:00:00 1970 From: "dmitry.torokhov@gmail.com" Subject: Re: =?utf-8?B?562U5aSNOiDnrZTlpI06IOetlA==?= =?utf-8?B?5aSNOiBbUEFUQ0g=?= =?utf-8?Q?=5D?= input: alps-fix the issue alps cs19 trackstick do not work. Date: Tue, 11 Jun 2019 10:32:28 -0700 Message-ID: <20190611173228.GD143729@dtor-ws> References: <20190610104310.qa5snt7jpcljodfv@pali> <5587ddb9-fb5f-03db-ac11-a696c85c5f2f@canonical.com> <20190611072333.nd4va4q2m5epmukc@pali> <20190611170707.GA143729@dtor-ws> <20190611171707.tydk7rsmtzmjohky@pali> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <20190611171707.tydk7rsmtzmjohky@pali> Sender: linux-kernel-owner@vger.kernel.org To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: Hui Wang , Xiaoxiao Liu , XiaoXiao Liu , "peter.hutterer@who-t.net" , "linux-input@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Xiaojian Cao , "zhangfp1@lenovo.com" , Naoki Saito , Hideo Kawase List-Id: linux-input@vger.kernel.org On Tue, Jun 11, 2019 at 07:17:07PM +0200, Pali Rohár wrote: > On Tuesday 11 June 2019 10:07:07 dmitry.torokhov@gmail.com wrote: > > On Tue, Jun 11, 2019 at 09:23:33AM +0200, Pali Rohár wrote: > > > On Tuesday 11 June 2019 12:32:33 Hui Wang wrote: > > > > On 2019/6/11 上午11:23, Hui Wang wrote: > > > > > On 2019/6/11 上午11:05, Xiaoxiao Liu wrote: > > > > > > Hi Pali, > > > > > > > > > > > > I discussed with our FW team about this problem. > > > > > > We think the V8 method means a touchpad feature  and does not fit > > > > > > the CS19 trackpoint device. > > > > > > CS19 TrackPoint needn't  use any Absolute (Raw) mode and is usually > > > > > > use standard mouse data. > > > > > > CS19 TrackPoint device is a completely different device with > > > > > > DualPoint device of Dell/HP. > > > > > > CS19 TrackPoint device is independent  of Touchpad. (Touchpad is > > > > > > connecting by I2C, TrackPoint is directly connecting with PS2 port.) > > > > > > And it has completely another FW. > > > > > > > > > > > > So we think it is better to use the mouse mode for CS19 trackpoint. > > > > > > > > > > Maybe here is some mis-understanding,  the mouse mode here doesn't mean > > > > > we use psmouse-base.c for cs19 (bare ps/2 mouse), we plan to use > > > > > trackpoint.c to drive this HW, so this trackpoint has all features a > > > > > trackpoint should have. > > > > > > > > > And I sent a patch one month ago to let the the trackpoint.c to drive this > > > > HW: https://www.spinics.net/lists/linux-input/msg61341.html, maybe that > > > > patch is reference. > > > > > > So instead of creating blacklist, you should check for TP_VARIANT_ALPS > > > in alps.c and disallow its usage. > > > > > > Or maybe better, move trackpoint.c detect code before alsp.c detect code > > > in psmouse-base. And no changes in alps.c are needed. > > > > I'd be very cautions of moving around the protocol detection. It is very > > fragile, so if we can detect trackpoint-only case in alps.c and skip on > > to trackpoint I would prefer it. > > The main problem is that proposed trackpoint-only check in alps.c is > basically what trackpoint.c is doing for checking if device is > trackpoint (via function trackpoint_start_protocol()). > > So I'm not sure now what is the best solution... Unfortunately currently trackpoint is being probed only after we tried Elan, Genius, and Logitech PS2++ protocols, and I am not sure if moving trackpoint around will disturb them or not. I do not think there is much code duplication by pulling limited version of trackpoint detection code into alps.c and then have it bail out when it sees trackpoint-only device so trackpoint.c can handle it properly. Thanks. -- Dmitry