linux-kernel - [PATCH v2 RESEND] gpiolib: Add pin change notification

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Message-Id: <1224543007.3954.71.camel@moss.renham>
Date:	Tue, 21 Oct 2008 09:50:06 +1100
From:	Ben Nizette <bn@...sdigital.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-embedded <linux-embedded@...r.kernel.org>
Subject: [PATCH v2 RESEND] gpiolib: Add pin change notification

This adds pin change notification to the gpiolib sysfs interface. It
requires 16 extra bytes in gpio_desc iff CONFIG_GPIO_SYSFS which in turn
means, eg, 4k of .bss usage on AVR32.  Due to limitations in sysfs, this
patch makes poll(2) and friends work as expected on the "value"
attribute, though reads on "value" will never block and there is no
facility for async reads and writes.

Signed-off-by: Ben Nizette <bn@...sdigital.com>

---

Right, there seems to be a new outgoing mail server between me and you
which viciously attacks tabulations.  Until I find the monkey
responsible please accept the patch as an attachment along with my
apologies.

 Documentation/gpio.txt |   48 +++++++++
 drivers/gpio/gpiolib.c |  246 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 289 insertions(+), 5 deletions(-)

View attachment "pinchange.patch" of type "text/x-patch" (11350 bytes)