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

From: David Brownell
Date: Thu Oct 16 2008 - 15:46:18 EST

---------- Forwarded Message ----------

Subject: [PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1
Date: Friday 10 October 2008
From: "Steven A. Falco" <sfalco@xxxxxxxxxx>
To: "linuxppc-dev@xxxxxxxxxx" <linuxppc-dev@xxxxxxxxxx>, david-b@xxxxxxxxxxx

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@xxxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>

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;
- status = sprintf(buf, "%d\n", gpio_get_value_cansleep(gpio));
+ status = sprintf(buf, "%d\n", !!gpio_get_value_cansleep(gpio));

return status;

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