From mboxrd@z Thu Jan 1 00:00:00 1970 From: Henrik Rydberg Subject: Re: [PATCH] input: Introduce light-weight contact tracking Date: Sun, 07 Nov 2010 21:50:57 +0100 Message-ID: <4CD71131.3080706@euromail.se> References: <1289161108-32309-1-git-send-email-rydberg@euromail.se> <4CD70FC0.6060503@seas.upenn.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from ch-smtp03.sth.basefarm.net ([80.76.149.214]:56531 "EHLO ch-smtp03.sth.basefarm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752603Ab0KGUvi (ORCPT ); Sun, 7 Nov 2010 15:51:38 -0500 In-Reply-To: <4CD70FC0.6060503@seas.upenn.edu> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Rafi Rubin Cc: Dmitry Torokhov , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Chris Bagwell , Chase Douglas , Takashi Iwai On 11/07/2010 09:44 PM, Rafi Rubin wrote: > On 11/07/2010 03:18 PM, Henrik Rydberg wrote: >> Some kernel drivers demand the use of contact tracking for proper >> filtering and pointer emulation. With one exception, these drivers >> are limited to a maximum of four concurrent contacts. This patch adds >> a simple matcher for up to four contacts, with these notable properties: > > Tracking in the ntrig driver needs to support a minimum of 6 fingers. I have > also seen press releases claiming 10+ eventually. I don't know if those devices > will support tracking in the hardware/firmware. This is the exception I was talking about. The thing is, I can very well see a driver supporting four fingers even if the device claims to support six. After all, getting those four fingers working well will still be a big improvement. Henrik