From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: a question about lid input device Date: Wed, 7 Jul 2010 10:19:06 -0700 Message-ID: <20100707171906.GA4108@core.coreip.homeip.net> References: <1276412011.19052.19294.camel@rzhang1-desktop> <20100614020127.GA30773@khazad-dum.debian.net> <8005.1278515660@foxharp.boston.ma.us> <20100707162511.GA25178@core.coreip.homeip.net> <16574.1278521464@foxharp.boston.ma.us> <20100707170125.GB25178@core.coreip.homeip.net> <18986.1278522498@foxharp.boston.ma.us> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-px0-f174.google.com ([209.85.212.174]:33149 "EHLO mail-px0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752479Ab0GGRT1 (ORCPT ); Wed, 7 Jul 2010 13:19:27 -0400 Received: by pxi14 with SMTP id 14so2756588pxi.19 for ; Wed, 07 Jul 2010 10:19:27 -0700 (PDT) Content-Disposition: inline In-Reply-To: <18986.1278522498@foxharp.boston.ma.us> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Paul Fox Cc: Henrique de Moraes Holschuh , Zhang Rui , "linux-acpi@vger.kernel.org" , "Brown, Len" On Wed, Jul 07, 2010 at 01:08:18PM -0400, Paul Fox wrote: > dmitry wrote: > > On Wed, Jul 07, 2010 at 12:51:04PM -0400, Paul Fox wrote: > > > dmitry wrote: > > > > On Wed, Jul 07, 2010 at 11:14:20AM -0400, Paul Fox wrote: > ... > > > > > i understand that it's not fully general, but for the case of > > > > > the lid: is /proc/acpi/button/lid/LID/state going away? > > > > > > > > Yes, according to feature-removal.txt ACPI procfs interface shoudl have > > > > been gone back in 2008. > > > > > > thanks. i understand that adding sysfs entries for all the bells > > > and whistles on modern input devices might seem prohibitive. on > > > the other hand, there are some basic interfaces that are very > > > usefully accessed from the shell. i guess either way the > > > information is available, but having to rely on a utility package > > > for intermediate access always introduces new packaging > > > dependencies, release skew issues, etc, etc. > > > > > > > I am not wasting kernel memory to export full state of an arbitrary > > input device via sysfs just so someone out there might avoid writing or > > installig a utility. The interface was there for many years and is quite > > stable, I do not understand what release skew issues you are talking > > about. > > if, for example, the utility package available in a distro lags > behind the kernel. > How can it lag? The interface to query the state is available at least since 2.6.0 and is not likely to change for years to come. > but please consider my comments above as more of a lament than a > complaint. i understand your design decision -- it will make > your life easier, at the expense of making mine somewhat more > difficult. :-) > It is not that it will make my life easier. Exporting state in sysfs is easy, but do you really want your keyboard device to consume memory needed for 100+ sysfs nodes that nobody cares about? -- Dmitry