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authorGuennadi Liakhovetski <g.liakhovetski@pengutronix.de>2008-04-28 02:14:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:34 -0700
commite6de1808f8ebfeb7e49f3c5a30cb8f2032beb287 (patch)
tree2230ea8f384449c7785d636ab016af3b2aa20123 /include/asm-generic
parentd72cbed0c486e3db8b56380635f8e845073ce63a (diff)
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gpio: define gpio_is_valid()
Introduce a gpio_is_valid() predicate; use it in gpiolib. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> [ use inline function; follow the gpio_* naming convention; work without gpiolib; all programming interfaces need docs ] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/gpio.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 7e77b6ff45b..464c5b334dc 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -16,6 +16,12 @@
#define ARCH_NR_GPIOS 256
#endif
+static inline int gpio_is_valid(int number)
+{
+ /* only some non-negative numbers are valid */
+ return ((unsigned)number) < ARCH_NR_GPIOS;
+}
+
struct seq_file;
struct module;
@@ -99,6 +105,12 @@ extern int __gpio_cansleep(unsigned gpio);
#else
+static inline int gpio_is_valid(int number)
+{
+ /* only non-negative numbers are valid */
+ return number >= 0;
+}
+
/* platforms that don't directly support access to GPIOs through I2C, SPI,
* or other blocking infrastructure can use these wrappers.
*/