linux-kernel - Re: Generic battery interface

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Date:	Fri, 28 Jul 2006 03:35:10 +0300
From:	"Shem Multinymous" <multinymous@...il.com>
To:	"Vojtech Pavlik" <vojtech@...e.cz>
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 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?

>   + 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.

  Shem
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