linux-kernel - Re: Generic battery interface

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Message-ID: <20060727233154.GB4907@suse.cz>
Date:	Fri, 28 Jul 2006 01:31:54 +0200
From:	Vojtech Pavlik <vojtech@...e.cz>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Brown, Len" <len.brown@...el.com>,
	Shem Multinymous <multinymous@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-thinkpad@...ux-thinkpad.org, linux-acpi@...r.kernel.org
Subject: Re: Generic battery interface

On Fri, Jul 28, 2006 at 12:16:32AM +0200, Pavel Machek wrote:


> /dev/XXX
> + battery layer will need to be invented
> - that layer will need maintainer
> + maintainer ensures this is not a mess, allocates numbers

  and figures out which features are identical, which not, etc. This
  	will actually be a lot easier than with keyboards: The number of
	different battery drivers/types is rather limited fortunately.

  note: It's absolutely necessary to limit the API to a well usable
	SUBSET of a superset of the features of all drivers/devices,
	even sacrificing obscure features to keep the API sane. One
	example would be the HID Power spec, which simply can't be
	supported to full extent by any sane API.

> - does not quite suit zaurus-style batteries, that can _only_ be
> 	polled. Can be worked-around by polling from kernel (and we
> 	are often doing that, anyway)

  + and the kernel can change the polling frequency based on power
	saving state changes

> + userspace backdoor interface will need to be invented, /dev/uinput style
> - hard to handle obscure features
> 	(do_not_charge_battery_for_X_minutes), and we'll probably want
> 	to unify batteries a bit, probably loosing precision.

-- 
Vojtech Pavlik
Director SuSE Labs
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