From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yann Cantin Subject: Re: [RFC ebeam PATCH v3 0/2] Date: Tue, 07 Aug 2012 03:45:59 +0200 Message-ID: <50207357.5080208@laposte.net> References: <1344288104-20731-1-git-send-email-yann.cantin@laposte.net> <20120806214423.GC30355@kroah.com> <1743577.8bRY3CPqxH@dtor-d630.eng.vmware.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1743577.8bRY3CPqxH@dtor-d630.eng.vmware.com> Sender: linux-kernel-owner@vger.kernel.org To: Dmitry Torokhov Cc: Greg KH , linux-input@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-input@vger.kernel.org Le 07/08/2012 00:09, Dmitry Torokhov a =E9crit : > On Monday, August 06, 2012 02:44:23 PM Greg KH wrote: >> On Mon, Aug 06, 2012 at 11:21:42PM +0200, Yann Cantin wrote: >>> Hi, >>> >>> New USB input driver for eBeam devices. >>> >>> Currently, only the Luidia eBeam classic projection model is suppor= ted. >>> Edge model and a NEC interactive video-projector support planned fo= r the >>> end of the mounth. >>> >>> Patch 1 to blacklist the device for hid generic-usb. >>> >>> Patch 2 is the actual driver. >>> >>> Changes from previous : >>> - switch to div64_s64 for portable 64/64-bits divisions >=20 > Do you really need this much precision? It will be slower on 32 bits.= =2E Yes. I can give the details if you want (homography computation without floating point maths). >>> - some cosmetics in device name >>> - unused include and def removed >>> - variables name changes for readability >>> >>> Pending issues : >>> >>> - sysfs custom files : need to pass 13 parameters for calibration : >>> choice is between lots of simply-handled, or few with a big sscan= f. >> >> sysfs is "one value per file", so use lots of different files please= =2E >=20 > This is kind of a "one value" though - it is a transformation matrix. > Maybe switch it to binary - 9 s32? Right, but this somehow obfuscate the api. In the other hand, i doubt there will be lots of calibration tools other that mine. Is there any drawback for numerous sysfs custom files ? --=20 Yann Cantin A4FEB47F --