linux-kernel - Re: [RFC PATCH 0/3] GPIO switch framework

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Date:	Sun, 22 Mar 2009 17:25:21 +1100
From:	Ben Nizette <bn@...sdigital.com>
To:	Jani Nikula <ext-jani.1.nikula@...ia.com>
Cc:	david-b@...bell.net, linux-kernel@...r.kernel.org,
	juha.yrjola@...idboot.com
Subject: Re: [RFC PATCH 0/3] GPIO switch framework

On Fri, 2009-03-20 at 15:50 +0200, Jani Nikula wrote:
> Hi -
> 
> This RFC patchset is a pretty straightforward adaptation of OMAP GPIO
> switch framework for mainline integration.
> 
> The GPIO switch framework allows reporting and changing GPIO switches
> via sysfs, with debouncing and sysfs/in-kernel notifications for input
> switches.

OK, so what does this do that /sys/class/gpio/gpioN doesn't currently do
apart from debouncing?  And the output being a string rather than a
simple value (which IMO might be better suited to userspace
interpretation anyway).

I've got a patch, little abandoned at the bottom of my queue, which adds
poll(2) compatibility to the gpiolib sysfs entries [1] and extending
this patch to do debouncing as well would be almost trivial.

I guess what I'm getting at is that this seems like it solves a problem
which has been pretty much solved elsewhere since the OMAP boys wrote
this.

	--Ben.

[1] http://marc.info/?l=linux-kernel&m=122454305213792&w=2

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