[PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1

gpiolib can export GPIOs to userspace via sysfs.  This patch modifies
the gpio_value_show() so that any non-zero value is explicitly printed
as "1", rather than whatever numerical value the lower-level driver returns.

Signed-off-by: Steve Falco <sfalco at harris.com>
---

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 8d29405..36bf72b 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c

@@ -237,7 +237,7 @@ static ssize_t gpio_value_show(struct device *dev,
 	if (!test_bit(FLAG_EXPORT, &desc->flags))
 		status = -EIO;
 	else
-		status = sprintf(buf, "%d\n", gpio_get_value_cansleep(gpio));
+		status = sprintf(buf, "%d\n", !!gpio_get_value_cansleep(gpio));
 
 	mutex_unlock(&sysfs_lock);
 	return status;

On Friday 10 October 2008, Steven A. Falco wrote:

gpiolib can export GPIOs to userspace via sysfs.  This patch modifies
the gpio_value_show() so that any non-zero value is explicitly printed
as "1", rather than whatever numerical value the lower-level driver returns.

Signed-off-by: Steve Falco <sfalco at harris.com>

I just forwarded this to Andrew (cc LKML) with my
signoff ... sorry I forgot to add you to the CC.  :(