USB: Add USB_DEVICE_INTERFACE_PROTOCOL macro

The USB_DEVICE_INTERFACE_PROTOCOL will allow to match one interface
protocol of vendor specific device. This macro is used in patch adding
support for xbox360 to xpad.c
Signed-off-by: Jan Kratochvil <honza@jikos.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

include/linux/usb.h

@@ -728,6 +728,22 @@ static inline int usb_endpoint_is_isoc_out(const struct usb_endpoint_descriptor
 	.idVendor = (vend), .idProduct = (prod), \
 	.bcdDevice_lo = (lo), .bcdDevice_hi = (hi)
 
+/**
+ * USB_DEVICE_INTERFACE_PROTOCOL - macro used to describe a usb
+ *		device with a specific interface protocol
+ * @vend: the 16 bit USB Vendor ID
+ * @prod: the 16 bit USB Product ID
+ * @pr: bInterfaceProtocol value
+ *
+ * This macro is used to create a struct usb_device_id that matches a
+ * specific interface protocol of devices.
+ */
+#define USB_DEVICE_INTERFACE_PROTOCOL(vend,prod,pr) \
+	.match_flags = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
+	.idVendor = (vend), \
+	.idProduct = (prod), \
+	.bInterfaceProtocol = (pr)
+
 /**
  * USB_DEVICE_INFO - macro used to describe a class of usb devices
  * @cl: bDeviceClass value