linux-kernel - Re: [patch/rfc 2.6.25-git] gpio: sysfs interface

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Message-ID: <20080519223933.GA2315@elf.ucw.cz>
Date:	Tue, 20 May 2008 00:39:33 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Trent Piepho <tpiepho@...escale.com>,
	hartleys <hartleys@...ionengravers.com>,
	Ben Nizette <bn@...sdigital.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [patch/rfc 2.6.25-git] gpio: sysfs interface

On Sat 2008-05-17 15:14:06, David Brownell wrote:
> On Friday 02 May 2008, Pavel Machek wrote:
> > 
> > > >   echo "export 23" > /sys/class/gpio/control
> > > >     ... will gpio_request(23, "sysfs") and gpio_export(23); use
> > > >     /sys/class/gpio/gpio-23/direction to configure it.
> > > >   echo "unexport 23" > /sys/class/gpio/control
> > > >     ... will gpio_free(23)
> > > 
> > > hm, does ths sysfs one-value-per-file rule apply to writes?
> > 
> > Having seen ibm acpi interface... yes, that rule should be aplied for
> > writes, too.
> 
> The latest version of this patch, which I'll post soonish,
> follows the suggestion to have one file for the "export"
> operation and another for "unexport".
> 
> 
> > What about mkdir gpio-N to export it?
> 
> Ugh.  That would create way more complication than I want
> to see here.  I thought about that early on, and decided
> that was Not The Way To Go.

...but it would be consistent with configfs... and face it... doing
echo > file to make a directory is seriously ugly.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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