From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754981Ab1GWBLq (ORCPT ); Fri, 22 Jul 2011 21:11:46 -0400 Received: from adelie.canonical.com ([91.189.90.139]:56226 "EHLO adelie.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752030Ab1GWBLj (ORCPT ); Fri, 22 Jul 2011 21:11:39 -0400 Message-ID: <4E2A1FC5.90607@canonical.com> Date: Fri, 22 Jul 2011 18:11:33 -0700 From: Chase Douglas User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.18) Gecko/20110617 Thunderbird/3.1.11 MIME-Version: 1.0 To: djkurtz@chromium.org CC: dmitry.torokhov@gmail.com, rydberg@euromail.se, rubini@cvml.unipv.it, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, derek.foreman@collabora.co.uk, daniel.stone@collabora.co.uk, olofj@chromium.org Subject: Re: [PATCH 6/9 v2] Input: synaptics - process finger (<=3) transitions References: <1311169146-20066-1-git-send-email-djkurtz@chromium.org> <1311169146-20066-7-git-send-email-djkurtz@chromium.org> In-Reply-To: <1311169146-20066-7-git-send-email-djkurtz@chromium.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/20/2011 06:39 AM, djkurtz@chromium.org wrote: > From: Daniel Kurtz > > Synaptics image sensor touchpads track 5 fingers, but only report 2. > > This patch attempts to deal with some idiosyncrasies of these touchpads: > > * When there are 3 or more fingers, only two are reported. > * The number of fingers can change at any time, but is only reported in > SGM packets, thus at a number-of-fingers change, it is not possible > to tell whether the AGM finger is for the original or new number of > fingers. > * When the number of fingers changes from 2->3 it is not > possible to tell which of the 2 fingers are now reported. > * When number of fingers changes from 3->2 it is often not possible to > tell which finger was removed, and which are now being reported. > > When 2 or more packets are present on the touchpad, the kernel reports ^touches or fingers