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gpiolib: allow exported GPIO nodes to be named using sysfs links

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Commit 926b663ce8 (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>
This commit is contained in:
Jani Nikula 2009-09-22 16:46:33 -07:00 • committed by Linus Torvalds
parent d8c1acb166
commit a4177ee7f1
4 changed files with 74 additions and 0 deletions
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11
include/linux/gpio.h
View file

@ -12,6 +12,8 @@
#include <linux/types.h>
#include <linux/errno.h>
struct device;
/*
* Some platforms don't support the GPIO programming interface.
*
@ -89,6 +91,15 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
return -EINVAL;
}
static inline int gpio_export_link(struct device *dev, const char *name,
unsigned gpio)
{
/* GPIO can never have been exported */
WARN_ON(1);
return -EINVAL;
}
static inline void gpio_unexport(unsigned gpio)
{
/* GPIO can never have been exported */