From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiri Slaby Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver] Date: Tue, 27 Mar 2007 22:11:20 +0200 Message-ID: <46097A68.6080802@gmail.com> References: <2460126662758025813@fi.muni.cz> <46018FB8.1080601@gmail.com> <38b3b7c0703211503s3a8ee177v5b149cfd5975de8c@mail.gmail.com> <200703221150.12403.dtor@insightbb.com> <46090BF2.2000105@gmail.com> <38b3b7c0703271136s799114fcndfaa6de8db52fc70@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <38b3b7c0703271136s799114fcndfaa6de8db52fc70@mail.gmail.com> Sender: owner-linux-input@atrey.karlin.mff.cuni.cz List-Help: List-Owner: List-Post: List-Unsubscribe: To: johann deneux Cc: Dmitry Torokhov , =?UTF-8?B?IlNUZW55YUsgKEJydW5vIA==?= =?UTF-8?B?R29uesOhbGV6KSI=?= , Anssi Hannula , Linux kernel mailing list , linux-input@atrey.karlin.mff.cuni.cz List-Id: linux-input@vger.kernel.org johann deneux napsal(a): > On 3/27/07, Jiri Slaby wrote: >> Dmitry Torokhov napsal(a): >> > On Wednesday 21 March 2007 18:03, johann deneux wrote: >> >> I have forgotten the details of ioctl: Wouldn't the >> >> following work? >> >> No, at least, as far as I understand this. I have computed _torques_, not >> forces vector (this was misleading info in my first post), the >> question is >> "how can I pass torques through plane and direction entries into KS?". > > Torques and forces are both represented as 3d vectors. Yes, may be. > Are we > misunderstanding eachother maybe? By "vector" I mean a triplet of > numbers, when you say "torques" and "forces vector", do you mean that > each effect is composed of a bunch of torques? Ok, let's make things a little bit clear. I need to put somehow 3 short values (torques -- to tell 3 motors how much to spin around) into the kernel space via ff layer. I computed them using FP in US from forces (3d vector) and the problem is, that I don't know how to transform torques to plane(s) and dir and then back to torques -- this is what I can't figure out, since I have no longer vector -- 3 values for each axis, which says how big is the force in each axis -- but I have values (no axis) specific to each motor. thanks for notes, -- http://www.fi.muni.cz/~xslaby/ Jiri Slaby faculty of informatics, masaryk university, brno, cz e-mail: jirislaby gmail com, gpg pubkey fingerprint: B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E