linux-kernel - Re: how to represent sequence of brightnesses in /sys (was Re: [PATCH] Add the LED burst trigger)

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Date:	Sat, 28 Dec 2013 13:50:42 -0800
From:	Greg KH <greg@...ah.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Joe Xue <lgxue@...mail.com>,
	"cooloney@...il.com" <cooloney@...il.com>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	"rob@...dley.net" <rob@...dley.net>,
	"milo.kim@...com" <milo.kim@...com>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: how to represent sequence of brightnesses in /sys (was Re:
 [PATCH] Add the LED burst trigger)

On Sat, Dec 28, 2013 at 10:25:23PM +0100, Pavel Machek wrote:
> Hi!
> 
> > >> Sysfs is meant to be human-readable/writable, so please use plain ASCII
> > >> numbers in strings instead.
> > >
> > > Actually, sysfs is meant to be one value per file, and it is
> > 
> > Ideally, yes.
> > 
> > > understood that data that are "natively blob" are just passed as
> > > blob. (I believe this qualifies).
> > 
> > But it doesn't buy us much here, does it? It will make e.g. shell scripts
> > needlessly complicated.
> 
> echo -ne '\012' is not that bad, and parsing array of integers from
> kernel will be an ugly piece of code.

Ick, no.  What are you trying to do here?  Have the kernel intrepret a
sequence of bytes to flash an LED?  I thought we have frameworks in
userspace already to handle this type of thing.  Please don't invent new
ways of doing stuff...

greg k-h
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