From mboxrd@z Thu Jan 1 00:00:00 1970 From: Feng Tang Subject: Re: [PATCH 2/2] Input: tsc2007 - Add a z1_low_threshhold platform data parameter Date: Wed, 30 Nov 2011 10:34:18 +0800 Message-ID: <20111130103418.4514b630@feng-i7> References: <1322554378-348-1-git-send-email-feng.tang@intel.com> <1322554378-348-2-git-send-email-feng.tang@intel.com> <20111129092310.GB21758@core.coreip.homeip.net> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: Received: from mga14.intel.com ([143.182.124.37]:37395 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754633Ab1K3CfA (ORCPT ); Tue, 29 Nov 2011 21:35:00 -0500 In-Reply-To: <20111129092310.GB21758@core.coreip.homeip.net> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Dmitry Torokhov Cc: "linux-input@vger.kernel.org" , "linux-kernel@vger.kernel.org" , feng.tang@intel.com, "Clark, Joel" On Tue, 29 Nov 2011 17:23:10 +0800 Dmitry Torokhov wrote: > On Tue, Nov 29, 2011 at 04:12:58PM +0800, Feng Tang wrote: > > This originates from a patch in Meego IVI kernel with the name > > linux-2.6.37-connext-0027-tsc2007.patch > > There is no author info excepte a line "From MeeGo > > " > > > > When integrating tsc2007 on Intel IVI platform, there are a lot of > > noise data whose z1 value is around 10 which is not a sane "z1". So > > add a "z1_low_threshhold" to filter those nosie data, to make the > > device work properly. > > Sounds like a task for userspace to ignore pressure that is too low. > Bonus points for making it configurable so user can adjust > sensitivity. Actually, there is one more point :), without this patch, the driver won't work on our platforms. The tsc2007_soft_irq will keep reading the input data unless there is no valid pressure data. In our case, those noise data will be seen as valid data during tsc2007_calculate_pressure(), and the tsc2007_soft_irq will run endlessly. Thanks, Feng > > Thanks. >