linux-kernel - Re: [PATCH] battery: Fix charge_now returned by broken batteries

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Date:	Sat, 10 Oct 2009 14:04:48 +0200
From:	Pavel Machek <pavel@....cz>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	Alexey Starikovskiy <astarikovskiy@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] battery: Fix charge_now returned by broken batteries

Hi!

> > current full charge, when the charging is complete. It may end up lower or
> > greater than
> > previous value.
> > Comparing current charge with the last full charge may correctly give you
> >>100%.
> 
> Then maybe we can write something like...
> 
> val->intval = acpi_battery_is_charged(battery)
> 	? min(battery->capacity_now, battery->full_charge_capacity) * 1000
> 	: battery->capacity_now * 1000;
> 
> So we only use the min() operation when it is fully charged (returning
> to 100%) without losing information when charging.
> 
> The problem is that percentage may jump from >100% to 100% in
> batteries whose full capacity increase, but I think that is OK, since
> when completely charged, the >100% is the new 100%.
> 
> In "broken" batteries (is it broken finally? or is it expected
> behaviour?) like mine the old problem will be corrected, as it was
> only present in the charged state.

I believe you better work around this in userspace... or agree that
>100% charge is possible.

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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