[usb] Allow USB device IDs to include arbitrary driver-specific data

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/bus/usb.c

 		return -ENOENT;
 	}
 
+	/* Record driver */
+	func->driver = driver;
+	func->id = id;
+	func->dev.driver_name = id->name;
+
 	/* Probe driver */
 	if ( ( rc = driver->probe ( func, config ) ) != 0 ) {
 		DBGC ( usb, "USB %s failed to probe driver %s: %s\n",
 		return rc;
 	}
 
-	/* Record driver */
-	func->driver = driver;
-	func->dev.driver_name = id->name;
 	return 0;
 }
 

src/include/ipxe/usb.h

 	struct usb_driver *driver;
 	/** Driver private data */
 	void *priv;
+	/** Driver device ID */
+	struct usb_device_id *id;
 
 	/** List of interface numbers
 	 *
 	uint16_t vendor;
 	/** Product ID */
 	uint16_t product;
+	/** Arbitrary driver data */
+	unsigned long driver_data;
 };
 
 /** Match-anything ID */