gpio: <linux/gpio.h> and "no GPIO support here" stubs

[pandora-kernel.git] / include / linux / gpio.h

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
new file mode 100644 (file)
index 0000000..4987a84
--- /dev/null
+++ b/include/linux/gpio.h
@@ -0,0 +1,95 @@
+#ifndef __LINUX_GPIO_H
+#define __LINUX_GPIO_H
+
+/* see Documentation/gpio.txt */
+
+#ifdef CONFIG_GENERIC_GPIO
+#include <asm/gpio.h>
+
+#else
+
+/*
+ * Some platforms don't support the GPIO programming interface.
+ *
+ * In case some driver uses it anyway (it should normally have
+ * depended on GENERIC_GPIO), these routines help the compiler
+ * optimize out much GPIO-related code ... or trigger a runtime
+ * warning when something is wrongly called.
+ */
+
+static inline int gpio_is_valid(int number)
+{
+       return 0;
+}
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+       return -ENOSYS;
+}
+
+static inline void gpio_free(unsigned gpio)
+{
+       /* GPIO can never have been requested */
+       WARN_ON(1);
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+       return -ENOSYS;
+}
+
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+       return -ENOSYS;
+}
+
+static inline int gpio_get_value(unsigned gpio)
+{
+       /* GPIO can never have been requested or set as {in,out}put */
+       WARN_ON(1);
+       return 0;
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+       /* GPIO can never have been requested or set as output */
+       WARN_ON(1);
+}
+
+static inline int gpio_cansleep(unsigned gpio)
+{
+       /* GPIO can never have been requested or set as {in,out}put */
+       WARN_ON(1);
+       return 0;
+}
+
+static inline int gpio_get_value_cansleep(unsigned gpio)
+{
+       /* GPIO can never have been requested or set as {in,out}put */
+       WARN_ON(1);
+       return 0;
+}
+
+static inline void gpio_set_value_cansleep(unsigned gpio, int value)
+{
+       /* GPIO can never have been requested or set as output */
+       WARN_ON(1);
+}
+
+static inline int gpio_to_irq(unsigned gpio)
+{
+       /* GPIO can never have been requested or set as input */
+       WARN_ON(1);
+       return -EINVAL;
+}
+
+static inline int irq_to_gpio(unsigned irq)
+{
+       /* irq can never have been returned from gpio_to_irq() */
+       WARN_ON(1);
+       return -EINVAL;
+}
+
+#endif
+
+#endif /* __LINUX_GPIO_H */