From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 21 Jun 2001 10:05:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 21 Jun 2001 10:05:00 -0400 Received: from elektra.higherplane.net ([203.37.52.137]:20154 "EHLO elektra.higherplane.net") by vger.kernel.org with ESMTP id ; Thu, 21 Jun 2001 10:04:42 -0400 Date: Fri, 22 Jun 2001 00:21:26 +1000 From: john slee To: Matthias Urlichs Cc: "Dmitry A. Fedorov" , Balbir Singh , linux-kernel@vger.kernel.org Subject: Re: Is it useful to support user level drivers Message-ID: <20010622002126.K30872@higherplane.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.18i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 21, 2001 at 03:58:33PM +0200, Matthias Urlichs wrote: > At 23:50 +1000 2001-06-21, john slee wrote: > >i believe libgpio uses the existing usb/iee1394/serial/parallel > >interfaces to provide a limited userspace driver capability. > > That only means, however, that the specific kernel drivers explicitly > support mid-level usermode access. > > They still handle the actual hardware state changes without usermode support. yes, that was the point. while it might be a stretch of the "mechanism, not policy" argument, i like having drivers organized this way. it makes a lot of sense for hotpluggable things like usb. j. -- "Bobby, jiggle Grandpa's rat so it looks alive, please" -- gary larson