1 files changed, 15 insertions, 0 deletions

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index f29a502f4a6c..ecf675a59d21 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -16,7 +16,14 @@
 #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;
 
 /**
  * struct gpio_chip - abstract a GPIO controller
@@ -48,6 +55,7 @@ struct seq_file;
  */
 struct gpio_chip {
         char                    *label;
+        struct module           *owner;
 
         int                     (*direction_input)(struct gpio_chip *chip,
                                                 unsigned offset);
@@ -66,6 +74,7 @@ struct gpio_chip {
 
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
                         unsigned offset);
+extern int __init __must_check gpiochip_reserve(int start, int ngpio);
 
 /* add/remove chips */
 extern int gpiochip_add(struct gpio_chip *chip);
@@ -97,6 +106,12 @@ 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.
  */