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| author | Jani Nikula <ext-jani.1.nikula@nokia.com> | 2009-09-22 16:46:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:46 -0700 |
| commit | a4177ee7f1a83eecb1d75e85d32664b023ef65e9 (patch) | |
| tree | 614b12b1f28a1a9090d96bea33639265e3e79839 /include/linux/gpio.h | |
| parent | d8c1acb1664d17dd995e34507533321e986d9215 (diff) | |
| download | kernel-common-a4177ee7f1a83eecb1d75e85d32664b023ef65e9.tar.gz kernel-common-a4177ee7f1a83eecb1d75e85d32664b023ef65e9.tar.bz2 kernel-common-a4177ee7f1a83eecb1d75e85d32664b023ef65e9.zip | |
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/linux/gpio.h')
| -rw-r--r-- | include/linux/gpio.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/gpio.h b/include/linux/gpio.h index e10c49a5b96e..059bd189d35d 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -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 */ |