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

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Message-Id: <200804291428.59329.david-b@pacbell.net>
Date:	Tue, 29 Apr 2008 14:28:58 -0700
From:	David Brownell <david-b@...bell.net>
To:	Ben Nizette <bn@...sdigital.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Trent Piepho <tpiepho@...escale.com>,
	hartleys <hartleys@...ionengravers.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Bryan Wu <cooloney@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch/rfc 2.6.25-git] gpio: sysfs interface

On Monday 28 April 2008, Ben Nizette wrote:
> > > > 
> > > > Sysfs attributes are supposed to be pollable.  I've not done it,
> > > > but fs/sysfs/file.c::sysfs_notify() looks relevant ...
> > > 
> > > Right, that'll work.
> > 
> > OK.  In that case, I think I should plan to rename the "direction"
> > attribute as "configuration" or something a bit broader ... so that
> > writing "irq" (or maybe "rising", "falling", "bothedges", "poll")
> > would eventually configure it as an input with an IRQ handler.
> 
> Good plan, unless you'd prefer to see "direction" and "interrupt" config
> separate.  I have no real preference but IMO
>   echo "falling" > interrupt
> makes more immediate sense than
>   echo "falling" > configuration

OK, I'll leave it be then.  Given that not all GPIOs support
interrupts, I used the "poll" example intentionally ... being
able to poll every N seconds (milliseconds?) may be important.


> > 
> > Whenever someone contributes such an async notification scheme,
> > that is.  ;)
> 
> ;)


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