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

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Message-ID: <8bd0f97a0906040209r269fe700hffd0cdcba264ca0b@mail.gmail.com>
Date:	Thu, 4 Jun 2009 05:09:43 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio sysfs: add a "toggle" value

On Thu, Jun 4, 2009 at 05:06, David Brownell wrote:
> On Thursday 04 June 2009, Mike Frysinger wrote:
>> my next request was for a 1 letter command set and chaining
>> operations.  say you want to toggle a gpio line 4 times, having to go
>> between kernel and userspace for that seems kind of heavy.
>> echo TTTT > value
>
> Having that kind of stuff in kernelspace seems wrong;
> if you're going that route, embed Guile or something.  ;)
>
> The "TTTT" thing could as easily be scripted in BASH.

the point was to lower the number of user<->kernel transitions.  yes,
all of this stuff can of course be done in the shell, but it's hard to
push limits when the interface is tying your hands and sitting on your
back.
-mike
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