linux-kernel - Re: How to document dimension units for virtual files?

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Message-ID: <20061113121802.GC31613@elf.ucw.cz>
Date:	Mon, 13 Nov 2006 13:18:02 +0100
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <greg@...ah.com>
Cc:	Michael Holzheu <HOLZHEU@...ibm.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Ingo Oeser <ioe-lkml@...eria.de>, linux-kernel@...r.kernel.org,
	mschwid2@...ibm.com
Subject: Re: How to document dimension units for virtual files?

Hi!

> > If you want to export data to userspace via a virtual filesystem
> > like sysfs, the following rules are recommended:
> 
> Um, does this mean you expect us to change all of the currently existing
> sysfs file names?  And people get mad at me when I just move sysfs
> symlinks around...
> 
> Look at the hwmon drivers, and the documentation in
> Documentation/hwmon/sysfs-interface for a description of how we have
> been documenting this already.
> 
> In short, I don't really think we need to encode the units in the file
> name, somehow we have done pretty well without it so far :)

Well, problem is that some notebooks have battery capacity in mAh, and
some in mWh, and you can't convert between those.

We could do something like 

battery_stored_energy and battery_stored_current
                 (mWh)                      (mAh)

...but it looks ugly, and battery_capacity:mAh does not sound that bad
for a new interface.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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