From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Purdie Subject: Re: [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes Date: Wed, 15 Jul 2009 09:22:33 +0100 Message-ID: <1247646153.6248.3.camel@dax.rpnet.com> References: <1247517685-7719-1-git-send-email-mjg@redhat.com> <1247574573.23871.8.camel@dax.rpnet.com> <1247644518.26272.88.camel@rzhang-dt> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from dan.rpsys.net ([93.97.175.187]:64332 "EHLO dan.rpsys.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752196AbZGOI0N (ORCPT ); Wed, 15 Jul 2009 04:26:13 -0400 In-Reply-To: <1247644518.26272.88.camel@rzhang-dt> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Zhang Rui Cc: Matthew Garrett , "linux-kernel@vger.kernel.org" , "linux-acpi@vger.kernel.org" , "lenb@kernel.org" , "corentincj@iksaif.net" On Wed, 2009-07-15 at 15:55 +0800, Zhang Rui wrote: > > Also, are "userspace" and "kernel" as meaningful as they could be? > Would > > "sysfs" and "hwkeys" make more sense and allow for other future hardware > > differences? Perhaps someone will tie the backlight to an ambient light > > sensor for example... > > > > Hah, I just finished a patch to introduce the ACPI als driver. > > I'm not quite familiar with the status of ALS support in Linux kernel. > and here is my questions, > I don't think we have a generic sysfs driver for ALS, i.e. ALS class > device, right? > do you guys think it's reasonable to have one? We don't have one that I'm aware of. The first question is what information and configuration options are we likely to have with ALS sensors? If its just a light level reading, the input subsystem is ideally suited for sharing that. Is there configuration we need to expose? Cheers, Richard -- Richard Purdie Intel Open Source Technology Centre