linux-kernel - Re: Generic battery interface

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Message-ID: <20060728101153.GC25372@suse.cz>
Date:	Fri, 28 Jul 2006 12:11:53 +0200
From:	Vojtech Pavlik <vojtech@...e.cz>
To:	Shem Multinymous <multinymous@...il.com>
Cc:	Pavel Machek <pavel@...e.cz>, "Brown, Len" <len.brown@...el.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 03:35:10AM +0300, Shem Multinymous wrote:
> On 7/28/06, Vojtech Pavlik <vojtech@...e.cz> wrote:
> >  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.
> 
> Non-standard functions must be handled reasonably within the
> framework, otherwise drivers will have to build duplicate interfaces.
> 
> How about
>  /sys/whatever/battery0/voltage for standard attributes
> and
>  /sys/whatever/battery0/thinkpad/inhibit-charge-minutes
> for non-standard ones?

I think the thinkpad features actually fall into the 'standard API', if
not for any other reason, then because some 80% of kernel developers use
ThinkPads. ;)

> >  + and the kernel can change the polling frequency based on power
> >        saving state changes
> 
> Likewise for cached attributes (query hardware only if N jiffies
> passed since last querry, other return cached value). And that way,
> hardware query frequency is never higher than what userspace actually
> needs.
 

-- 
Vojtech Pavlik
Director SuSE Labs
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