linux-kernel - Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support

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Message-ID: <20110221094756.GC2616@pengutronix.de>
Date:	Mon, 21 Feb 2011 10:47:56 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Eric Miao <eric.y.miao@...il.com>,
	Peter Tyser <ptyser@...-inc.com>, linux-kernel@...r.kernel.org,
	Alek Du <alek.du@...el.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Joe Perches <joe@...ches.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support

> We had exported our 5V_enable gpio to sysfs to allow a user-space application 
> to enable/disable devices connected to 5V circuit.
> But on the other hand we had to read the current status of this gpio in the 
> power-fail interrupt handler to distinguish between false-positive (5V 
> disabled) and a correct detection.

What about gpio_export() (description in Documentation/gpio.txt)?

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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