linux-kernel - Re: [POWER] battery calibration parameters from sysfs

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Message-ID:  <1n8nu6-4va.ln1@chipmunk.wormnet.eu>
Date:	Fri, 4 Dec 2009 11:34:25 +0000
From:	Alexander Clouter <alex@...riz.org.uk>
To:	linux-kernel@...r.kernel.org
Cc:	linux-embedded@...r.kernel.org
Subject:  Re: [POWER] battery calibration parameters from sysfs

Linus Walleij <linus.walleij@...ricsson.com> wrote:
> 
> [snipped]
> 
> Is probably not very elegant. (Or is it?) Would it be permissible to
> pass in a table like:
> 
> cat >/sys/.../v_vs_cap <<EOF
> x0,y0
> x1,y1
> x2,y2
> EOF
> 
> And have the kernel parse x,y pairs up to EOF?
> 
> Or would it be preferable to do this thing by creating some
> misc device node like /dev/battery0 and a custom ioctl()?
> 
> Or is there some other way I haven't thought of?
> 
Although I'm a 'nobody' I would probably go for:
----
echo x0,y0:x1,y1:....
----

Pairs are seperated by ':' whilst values with ','.  I guess you could 
just use comma's all the way but I personally say that reduces 
readability...also means that maybe one day you want to pass only one or 
three values...the format could still work.

Easy to parse, a one liner, no fixed length, fits in with the existing 
use, etc etc.

Cheers

-- 
Alexander Clouter
.sigmonster says: You'll be sorry...

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