gpio: add userspace ABI for GPIO line information

[linux-2.6-block.git] / include / uapi / linux / gpio.h

diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h
index 3f93e1bcd3ddae4632952bdd9a3382d0821e900b..416ce47f22914e2b6a557007776234733fdfb4fa 100644 (file)
--- a/include/uapi/linux/gpio.h
+++ b/include/uapi/linux/gpio.h
@@ -25,6 +25,32 @@ struct gpiochip_info {
        __u32 lines;
 };
 
+/* Line is in use by the kernel */
+#define GPIOLINE_FLAG_KERNEL           (1UL << 0)
+#define GPIOLINE_FLAG_IS_OUT           (1UL << 1)
+#define GPIOLINE_FLAG_ACTIVE_LOW       (1UL << 2)
+#define GPIOLINE_FLAG_OPEN_DRAIN       (1UL << 3)
+#define GPIOLINE_FLAG_OPEN_SOURCE      (1UL << 4)
+
+/**
+ * struct gpioline_info - Information about a certain GPIO line
+ * @line_offset: the local offset on this GPIO device, fill in when
+ * requesting information from the kernel
+ * @flags: various flags for this line
+ * @name: the name of this GPIO line
+ * @label: a functional name for this GPIO line
+ * @kernel: this GPIO is in use by the kernel
+ * @out: this GPIO is an output line (false means it is an input)
+ * @active_low: this GPIO is active low
+ */
+struct gpioline_info {
+       __u32 line_offset;
+       __u32 flags;
+       char name[32];
+       char label[32];
+};
+
 #define GPIO_GET_CHIPINFO_IOCTL _IOR('o', 0x01, struct gpiochip_info)
+#define GPIO_GET_LINEINFO_IOCTL _IOWR('o', 0x02, struct gpioline_info)
 
 #endif /* _UAPI_GPIO_H_ */