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authorJani Nikula <ext-jani.1.nikula@nokia.com>2009-12-15 16:46:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:01 -0800
commit0769746183caff9d4334be48c7b0e7d2ec8716c4 (patch)
treee23768be82bd84cf8331709ecc1fd36c3d468f33 /include/linux/gpio.h
parent35570ac6039ef490b9c5abde1fee4803a39bf4e1 (diff)
downloadop-kernel-dev-0769746183caff9d4334be48c7b0e7d2ec8716c4.zip
op-kernel-dev-0769746183caff9d4334be48c7b0e7d2ec8716c4.tar.gz
gpiolib: add support for changing value polarity in sysfs
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>
Diffstat (limited to 'include/linux/gpio.h')
-rw-r--r--include/linux/gpio.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 059bd18..4e949a5 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -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)
{
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