From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?=C9ric_Piel?= Subject: Re: [PATCH 2/2] elantech: Report multitouch with proper ABS_MT messages Date: Wed, 05 May 2010 20:35:03 +0200 Message-ID: <4BE1BA57.5080709@tudelft.nl> References: <4BE1629E.50901@tudelft.nl> <20100505163832.GA7337@core.coreip.homeip.net> <4BE1B289.2040204@euromail.se> <4BE1B595.9090705@tudelft.nl> <4BE1B84C.1040903@euromail.se> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailservice.tudelft.nl ([130.161.131.5]:58636 "EHLO mailservice.tudelft.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753028Ab0EESfF (ORCPT ); Wed, 5 May 2010 14:35:05 -0400 In-Reply-To: <4BE1B84C.1040903@euromail.se> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Henrik Rydberg Cc: Dmitry Torokhov , Florian Ragwitz , "linux-input@vger.kernel.org" Op 05-05-10 20:26, Henrik Rydberg schreef: > =C9ric Piel wrote: : >> Let me give you some more details. From what is seems, the hardware = can >> reports the width of a touch, but only when there is one single touc= h. >> So far we report it via ABS_TOOL_WIDTH. When there is 2 or 3 touches= , >> the width is unknown. So the precise question is: >> Should we report also ABS_MT_TOUCH_MAJOR in addition to ABS_TOOL_WID= TH, >> whenever it is known (ie: one finger), or just not bother and only >> report ABS_TOOL_WIDTH? >=20 > With only partial information available it will not be of much use an= yway, so > omitting ABS_MT_TOUCH is probably best. The ABS_TOOL_WIDTH will most = likely not > be used by a driver either (it wont in the Multitouch X Driver anyway= s). The > synaptics driver cares for palm detection, but the scale has to be ve= ry specific > to work properly (i.e., requires testing with synaptics to be useful)= =2E Thanks for clarifying! BTW, does anyone know a graphical app which reads the MT events from a /dev/input/eventX device and displays them as points in a window? That would be rather helpful to reverse-engineer/debug multitouch hardwares. Eric -- 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