1 files changed, 88 insertions, 0 deletions
diff --git a/include/uapi/linux/usb/gadgetfs.h b/include/uapi/linux/usb/gadgetfs.h
new file mode 100644
index 000000000000..0bb12e0d4f8f
--- /dev/null
+++ b/include/uapi/linux/usb/gadgetfs.h
@@ -0,0 +1,88 @@
+/*
+ * Filesystem based user-mode API to USB Gadget controller hardware
+ *
+ * Other than ep0 operations, most things are done by read() and write()
+ * on endpoint files found in one directory.  They are configured by
+ * writing descriptors, and then may be used for normal stream style
+ * i/o requests.  When ep0 is configured, the device can enumerate;
+ * when it's closed, the device disconnects from usb.  Operations on
+ * ep0 require ioctl() operations.
+ *
+ * Configuration and device descriptors get written to /dev/gadget/$CHIP,
+ * which may then be used to read usb_gadgetfs_event structs.  The driver
+ * may activate endpoints as it handles SET_CONFIGURATION setup events,
+ * or earlier; writing endpoint descriptors to /dev/gadget/$ENDPOINT
+ * then performing data transfers by reading or writing.
+ */
+
+#ifndef __LINUX_USB_GADGETFS_H
+#define __LINUX_USB_GADGETFS_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#include <linux/usb/ch9.h>
+
+/*
+ * Events are delivered on the ep0 file descriptor, when the user mode driver
+ * reads from this file descriptor after writing the descriptors.  Don't
+ * stop polling this descriptor.
+ */
+
+enum usb_gadgetfs_event_type {
+	GADGETFS_NOP = 0,
+
+	GADGETFS_CONNECT,
+	GADGETFS_DISCONNECT,
+	GADGETFS_SETUP,
+	GADGETFS_SUSPEND,
+	/* and likely more ! */
+};
+
+/* NOTE:  this structure must stay the same size and layout on
+ * both 32-bit and 64-bit kernels.
+ */
+struct usb_gadgetfs_event {
+	union {
+		/* NOP, DISCONNECT, SUSPEND: nothing
+		 * ... some hardware can't report disconnection
+		 */
+
+		/* CONNECT: just the speed */
+		enum usb_device_speed	speed;
+
+		/* SETUP: packet; DATA phase i/o precedes next event
+		 *(setup.bmRequestType & USB_DIR_IN) flags direction
+		 * ... includes SET_CONFIGURATION, SET_INTERFACE
+		 */
+		struct usb_ctrlrequest	setup;
+	} u;
+	enum usb_gadgetfs_event_type	type;
+};
+
+
+/* The 'g' code is also used by printer gadget ioctl requests.
+ * Don't add any colliding codes to either driver, and keep
+ * them in unique ranges (size 0x20 for now).
+ */
+
+/* endpoint ioctls */
+
+/* IN transfers may be reported to the gadget driver as complete
+ *	when the fifo is loaded, before the host reads the data;
+ * OUT transfers may be reported to the host's "client" driver as
+ *	complete when they're sitting in the FIFO unread.
+ * THIS returns how many bytes are "unclaimed" in the endpoint fifo
+ * (needed for precise fault handling, when the hardware allows it)
+ */
+#define	GADGETFS_FIFO_STATUS	_IO('g', 1)
+
+/* discards any unclaimed data in the fifo. */
+#define	GADGETFS_FIFO_FLUSH	_IO('g', 2)
+
+/* resets endpoint halt+toggle; used to implement set_interface.
+ * some hardware (like pxa2xx) can't support this.
+ */
+#define	GADGETFS_CLEAR_HALT	_IO('g', 3)
+
+#endif /* __LINUX_USB_GADGETFS_H */