* [PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1
@ 2008-10-10 14:04 Steven A. Falco
2008-10-16 19:46 ` David Brownell
0 siblings, 1 reply; 2+ messages in thread
From: Steven A. Falco @ 2008-10-10 14:04 UTC (permalink / raw)
To: linuxppc-dev@ozlabs.org, david-b
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;
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1
2008-10-10 14:04 [PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1 Steven A. Falco
@ 2008-10-16 19:46 ` David Brownell
0 siblings, 0 replies; 2+ messages in thread
From: David Brownell @ 2008-10-16 19:46 UTC (permalink / raw)
To: Steven A. Falco; +Cc: linuxppc-dev@ozlabs.org
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. :(
> ---
>
> 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;
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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