From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: A question about touchscreen absmax value Date: Mon, 16 Nov 2009 21:48:23 -0800 Message-ID: <20091117054822.GA6451@core.coreip.homeip.net> References: <4B00B08E.2030905@samsung.com> <20091116171202.GC24026@core.coreip.homeip.net> <4B0211B8.4020508@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-px0-f180.google.com ([209.85.216.180]:64831 "EHLO mail-px0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752373AbZKQFsV (ORCPT ); Tue, 17 Nov 2009 00:48:21 -0500 Received: by mail-px0-f180.google.com with SMTP id 10so1690973pxi.33 for ; Mon, 16 Nov 2009 21:48:28 -0800 (PST) Content-Disposition: inline In-Reply-To: <4B0211B8.4020508@samsung.com> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Joonyoung Shim Cc: linux-input@vger.kernel.org On Tue, Nov 17, 2009 at 12:00:08PM +0900, Joonyoung Shim wrote: > On 11/17/2009 2:12 AM, Dmitry Torokhov wrote: > > Hi Joonyoung, > > > > On Mon, Nov 16, 2009 at 10:53:18AM +0900, Joonyoung Shim wrote: > >> Hi, all. > >> > >> I have a question about touchscreen resolution. My touchscreen device > >> can report the position from 0 to 1023 of x and y coordinates, so i > >> setted the absmax of input device to 1023. BTW, i only can get from 0 to > >> 479 x position and to 799 y position because the LCD resolution of the > >> target is 480 x 800. I wonder which value is setted to the absmax - 479 > >> and 799 or 1023. > > > > I believe driver should, by default, set absmin and absmax to match the > > limits of the hardware/protocol. In your case it would be 1023. The > > driver may choose to accept additional infromation from platform data, if > > present, you can also adjust absmin/absmax etc via ioctl durng the > > bootup sequence. > > Hmm, i get the resolution information from platform data, so i can > set absmax values from platform data. Is it ok? > Sure, if there is only one possible configuration for the device on a given platform - yes. -- Dmitry