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gpiolib: add support for changing value polarity in sysfs

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Drivers may use gpiolib sysfs as part of their public user space
interface. The GPIO number and polarity might change from board to
board. The gpio_export_link() call can be used to hide the GPIO number
from user space. Add support for also hiding the GPIO line polarity
changes from user space.

Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jani Nikula
2009-12-15 16:46:20 -08:00
committed by Linus Torvalds
parent 35570ac603
commit 0769746183
4 changed files with 176 additions and 12 deletions
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6
include/linux/gpio.h
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@@ -99,6 +99,12 @@ static inline int gpio_export_link(struct device *dev, const char *name,
return -EINVAL;
}
static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
{
/* GPIO can never have been requested */
WARN_ON(1);
return -EINVAL;
}
static inline void gpio_unexport(unsigned gpio)
{