linux-kernel - Re: [PATCH] gpio sysfs: add a "toggle" value

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Date:	Thu, 4 Jun 2009 02:48:07 -0700
From:	David Brownell <david-b@...bell.net>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio sysfs: add a "toggle" value

On Thursday 04 June 2009, Mike Frysinger wrote:
> > I don't like the idea of embedding any kind of interpreter
> > in the sysfs interface, but that's the direction you seem
> > to be heading ...
> 
> i dont view the userspace GPIO interface as a simple "i want to wiggle
> pins for fun and testing".  i see it as a dynamic method for building
> userspace drivers for simple devices.

I don't.  I see it as an adjunct to real drivers.  Or maybe
we just differ on what "simple" means here.


> as such, having a very simple 
> "command language" for optimizing the interaction provides a pretty
> good trade off between kernel complexity and lowering overhead imo.

If that's what you want, why don't you write a custom driver
that provides the kind of command interpreter you want?

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