Date: Sat, 27 Oct 2007 23:50:25 +0400
From: Anton Vorontsov <cbou@mail.ru>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Andrey Borzenkov <arvidjaar@mail.ru>, linux-acpi@vger.kernel.org,
       linux-kernel@vger.kernel.org, davidz@redhat.com, rhughes@redhat.com
Subject: Re: [PATCH] 2.6.24-rc1: ensure "present" sysfs attribute even if
	battery is absent
Message-ID: <20071027195025.GA3263@zarina>
Reply-To: cbou@mail.ru
References: <200710272054.31160.arvidjaar@mail.ru> <20071027184249.GA2982@zarina> <1193513524.2915.18.camel@shinybook.infradead.org>
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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
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