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

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Date:	Mon, 28 Apr 2008 19:54:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Brownell <david-b@...bell.net>
Cc:	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>, Greg KH <greg@...ah.com>
Subject: Re: [patch/rfc 2.6.25-git] gpio: sysfs interface

On Mon, 28 Apr 2008 16:28:13 -0700 David Brownell <david-b@...bell.net> wrote:

> > If we had a strcmp() variant which treats a \n in the first arg as a \0
> > the above would become
> > 
> > 	if (sysfs_streq(buf, "high"))
> > 		status = gpio_direction_output(gpio, 1);
> > 	else if (sysfs_streq(buf, "out") || sysfs_streq(buf, "low"))
> > 		status = gpio_direction_output(gpio, 0);
> > 	else if (sysfs_streq(buf, "in"))
> > 		status = gpio_direction_input(gpio);
> 
> That would indeed be better.  Maybe I should whip up a sysfs
> patch adding that, and have this depend on that patch.  (I've
> CC'd Greg in case he has comments on that...)

Yes, it would be a standalone patch.  The sort which generates oceans of
useful feedback ;) The sort which also generates hundreds of
use-new-toy-to-clean-up-old-code patches for me to merge :(

> Alternatively:  strict_streq(), analogy to strict_strto*()?

Yeah, I couldn't think of a decent name.  I do think it should return true
on finding a match so callers don't need to use !  or ==0.  So its name
shouldn't look anything like "strcmp".

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