linux-kernel - Re: Purpose of parameter in sysfs binary read

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Message-ID: <20090819170501.1dbd29a8@lxorguk.ukuu.org.uk>
Date:	Wed, 19 Aug 2009 17:05:01 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
Cc:	"Greg KH" <greg@...ah.com>,
	"Linux USB" <linux-usb@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: Purpose of parameter in sysfs binary read

On Tue, 18 Aug 2009 09:41:56 -0600
"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu> wrote:

> Greg KH wrote:
> > On Tue, Aug 18, 2009 at 08:55:29AM -0600, Rick L. Vinyard, Jr. wrote:
> > What are you using the binary sysfs attribute for?  It should ONLY be
> > used as a pass-through to and from hardware, with no interpretation by
> > the kernel at all.
> 
> It's for the Logitech G13's game panel image (a simple binary bitmap of
> the pixels).
> 
> It doesn't do any interpretation... just a few checks on the magic number
> and size.

If its a bitmap image why not register the device as a framebuffer ?
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