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gpio: 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@harris.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Steven A. Falco 2008-10-18 20:27:48 -07:00 committed by Linus Torvalds
parent c8fc40cd34
commit e3274e9150
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpiolib.c
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@ -248,7 +248,7 @@ 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;