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

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Date:	Thu, 4 Jun 2009 04:52:35 -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 04:27, David Brownell wrote:
> On Thursday 04 June 2009, Mike Frysinger wrote:
>> > A suitable place to document this is Documentation/gpio.txt.
>>
>> yes, but i wanted to make sure David didnt reject the idea before i
>> spend time writing documentation.
>
> My initial reaction was that the function is somewhat superfluous,
> so having a use case in the patch comment would be good:  why
> can't userspace do the toggle itself?

when people were using the simple-gpio driver i wrote (which had
pretty much function parity with the sysfs implementation), i had a
customer or two ask for toggle for their systems.  i didnt get details
for why they wanted a toggle however ... they wanted it in their app
and adding it was trivial.

> On the other hand, I find it hard to object to such a small feature.
> If that's the worst feature bloat in Linux this year, we're overdue
> for a big party.  ;)

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
-mike
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