linux-kernel - Re: [PATCH v2] Re: Battery class driver.

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Message-ID: <20061028210509.GA30819@elf.ucw.cz>
Date:	Sat, 28 Oct 2006 23:05:09 +0200
From:	Pavel Machek <pavel@....cz>
To:	David Zeuthen <davidz@...hat.com>
Cc:	Richard Hughes <hughsient@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Shem Multinymous <multinymous@...il.com>,
	Dan Williams <dcbw@...hat.com>, linux-kernel@...r.kernel.org,
	devel@...top.org, sfr@...b.auug.org.au, len.brown@...el.com,
	greg@...ah.com, benh@...nel.crashing.org,
	linux-thinkpad mailing list <linux-thinkpad@...ux-thinkpad.org>
Subject: Re: [PATCH v2] Re: Battery class driver.

On Sat 2006-10-28 15:53:56, David Zeuthen wrote:
> On Sat, 2006-10-28 at 18:55 +0000, Pavel Machek wrote:
> > Bad idea... I bet someone will just ignore the units part, because all
> > the machines he seen had mW there. 
> 
> Sure, user space can do silly things. Just ask davej. Let's try to
> assume they don't.
> 
> > Just put it into the name:
> > 
> > power_avg_mV
> 
> Bad idea... it means user space will have to try to open different files
> and what happens when someone introduces a new unit? Ideally I'd like
> the unit to be part of the payload of the sysfs file. Second to that I
> think having the unit in a separate file is preferable.

Introducing new unit *should* be hard. You know, when you introduce
new unit, you automatically break all the userspace.

Having separate files is actually a *feature*. It allows you to
introduce new units while providing backwards compatibility.

Imagine going from mV to uV... With voltage_mV, you can have both
voltage_mV and voltage_uV. In your system, you'd have to change value
from mV to uV, breaking all the userspace....
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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