From mboxrd@z Thu Jan 1 00:00:00 1970 From: simon@mungewell.org Subject: Re: [PATCH v4 01/24] input: Add ff-memless-next module Date: Wed, 14 May 2014 11:11:40 -0400 Message-ID: References: <1398524543-15012-1-git-send-email-madcatxster@devoid-pointer.net> <1398524543-15012-2-git-send-email-madcatxster@devoid-pointer.net> <20140514063806.GC13621@core.coreip.homeip.net> <1818063.tFLKhAd1oy@sigyn> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: Received: from host171.canaca.com ([67.55.55.225]:56897 "EHLO host171.canaca.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753702AbaENPLo (ORCPT ); Wed, 14 May 2014 11:11:44 -0400 In-Reply-To: <1818063.tFLKhAd1oy@sigyn> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: =?iso-8859-1?Q?=22Michal_Mal=FD=22?= Cc: Dmitry Torokhov , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, jkosina@suse.cz, elias.vds@gmail.com, anssi.hannula@iki.fi, simon@mungewell.org > If we ever come across a really memoryless device it should not be > particularly difficult to add another callback to ff-memless-next which > would emulate conditional effects with constant force. It should be noted that some (/many?) applications/games already use the CF with position feedback to emulate behaviour such as springs. The feed back loop is simply not fast enough to do emulation of friction/inertia. I don't believe that the FF layer in the kernel should be 'tricked out' with lots of emulation features. As a game designer (ok... tinkerer) it's a bit of a pain that devices lie about what they can really do - ie. gamepads claiming periodic ability when all they are doing is faking it with rumble. Simon.