From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Vorontsov Subject: Re: [PATCH] 2.6.24-rc1: ensure "present" sysfs attribute even if battery is absent Date: Sat, 27 Oct 2007 23:50:25 +0400 Message-ID: <20071027195025.GA3263@zarina> References: <200710272054.31160.arvidjaar@mail.ru> <20071027184249.GA2982@zarina> <1193513524.2915.18.camel@shinybook.infradead.org> Reply-To: cbou@mail.ru Mime-Version: 1.0 Content-Type: text/plain; charset=utf8 Return-path: Received: from mx39.mail.ru ([194.67.23.35]:49982 "EHLO mx39.mail.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752349AbXJ0TwT (ORCPT ); Sat, 27 Oct 2007 15:52:19 -0400 Content-Disposition: inline In-Reply-To: <1193513524.2915.18.camel@shinybook.infradead.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: David Woodhouse Cc: Andrey Borzenkov , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, davidz@redhat.com, rhughes@redhat.com On Sat, Oct 27, 2007 at 03:32:04PM -0400, David Woodhouse wrote: > On Sat, 2007-10-27 at 22:42 +0400, Anton Vorontsov wrote: > > Well, PROP_PRESENT wasn't my idea, currently it's used by pmu and > > olpc drivers becuase it's not trivial to register/unregister their > > batteries on physical insertion/removal. I have some plans to teach > > at least pmu batteries to not use PROP_PRESENT. I don't have any > > OLPC, thus I can't convert it. > > Actually it's not hard to do that. I didn't say it's hard. But we don't have any interrupts for the battery events, thus we have to implement polling. > It was done this way in response to a > request from the userspace side. IIRC. Oh. Userspace tried to do something weird then, I think. Generally it's just sane to unregister absent hardware. -- Anton Vorontsov email: cbou@mail.ru backup email: ya-cbou@yandex.ru irc://irc.freenode.net/bd2