Re: [PATCH] Modify sysfs gpio export so that "value" displays as 0 or 1
From: David Brownell <hidden>
Date: 2008-10-16 19:47:46
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. :(
quoted hunk ↗ jump to hunk
---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;