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authorJani Nikula <ext-jani.1.nikula@nokia.com>2009-09-22 16:46:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:46 -0700
commita4177ee7f1a83eecb1d75e85d32664b023ef65e9 (patch)
tree614b12b1f28a1a9090d96bea33639265e3e79839 /include/asm-generic/gpio.h
parentd8c1acb1664d17dd995e34507533321e986d9215 (diff)
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gpiolib: allow exported GPIO nodes to be named using sysfs links
Commit 926b663ce8215ba448960e1ff6e58b67a2c3b99b (gpiolib: allow GPIOs to be named) already provides naming on the chip level. This patch provides more flexibility by allowing multiple names where ever in sysfs on a per GPIO basis. Adapted from David Brownell's comments on a similar concept: http://lkml.org/lkml/2009/4/20/203. [randy.dunlap@oracle.com: fix build for CONFIG_GENERIC_GPIO=n] Signed-off-by: Jani Nikula <ext-jani.1.nikula@nokia.com> Acked-by: David Brownell <david-b@pacbell.net> Cc: Daniel Silverstone <dsilvers@simtec.co.uk> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic/gpio.h')
-rw-r--r--include/asm-generic/gpio.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index d6c379dc64f..9cca3785cab 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -141,6 +141,8 @@ extern int __gpio_to_irq(unsigned gpio);
* but more typically is configured entirely from userspace.
*/
extern int gpio_export(unsigned gpio, bool direction_may_change);
+extern int gpio_export_link(struct device *dev, const char *name,
+ unsigned gpio);
extern void gpio_unexport(unsigned gpio);
#endif /* CONFIG_GPIO_SYSFS */
@@ -185,6 +187,12 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
return -ENOSYS;
}
+static inline int gpio_export_link(struct device *dev, const char *name,
+ unsigned gpio)
+{
+ return -ENOSYS;
+}
+
static inline void gpio_unexport(unsigned gpio)
{
}