diff -urN linux-2.4.5.orig/drivers/usb/rio500.c linux-2.4.5/drivers/usb/rio500.c
--- linux-2.4.5.orig/drivers/usb/rio500.c	Mon Jun 18 17:10:39 2001
+++ linux-2.4.5/drivers/usb/rio500.c	Tue Jun 19 17:12:26 2001
@@ -38,6 +38,7 @@
 #include <linux/spinlock.h>
 #include <linux/usb.h>
 #include <linux/smp_lock.h>
+#include <linux/devfs_fs_kernel.h>
 
 #include "rio500_usb.h"
 
@@ -70,6 +71,7 @@
 };
 
 static struct rio_usb_data rio_instance;
+static devfs_handle_t rio500_devfs_handle;
 
 static int open_rio(struct inode *inode, struct file *file)
 {
@@ -492,6 +494,12 @@
 	if (usb_register(&rio_driver) < 0)
 		return -1;
 
+	rio500_devfs_handle = devfs_register(NULL, "usb/rio500",
+					DEVFS_FL_DEFAULT,
+					USB_MAJOR, RIO_MINOR,
+					S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
+					&usb_rio_fops, NULL);
+
 	info(DRIVER_VERSION " " DRIVER_AUTHOR);
 	info(DRIVER_DESC);
 
@@ -506,6 +514,7 @@
 	rio->present = 0;
 	usb_deregister(&rio_driver);
 
+	devfs_unregister(rio500_devfs_handle);
 
 }