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

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Date:	Wed,  3 Jun 2009 04:16:59 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] gpio sysfs: add a "toggle" value

Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/gpio/gpiolib.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 51a8d41..7f79732 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -274,7 +274,12 @@ static ssize_t gpio_value_store(struct device *dev,
 	else {
 		long		value;
 
-		status = strict_strtol(buf, 0, &value);
+		if (sysfs_streq(buf, "toggle")) {
+			value = !gpio_get_value_cansleep(gpio);
+			status = 0;
+		} else
+			status = strict_strtol(buf, 0, &value);
+
 		if (status == 0) {
 			gpio_set_value_cansleep(gpio, value != 0);
 			status = size;
-- 
1.6.3.1

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