Re: [PATCH] 2.6.24-rc1: ensure "present" sysfs attribute even if battery is absent

Anton Vorontsov
2007-10-27T19:52:28Z

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
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