--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * interface to user space for the gigaset driver
+ *
+ * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
+ *
+ * =====================================================================
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#ifndef GIGASET_INTERFACE_H
+#define GIGASET_INTERFACE_H
+
+#include <linux/ioctl.h>
+
+/* The magic IOCTL value for this interface. */
+#define GIGASET_IOCTL 0x47
+
+/* enable/disable device control via character device (lock out ISDN subsys) */
+#define GIGASET_REDIR _IOWR(GIGASET_IOCTL, 0, int)
+
+/* enable adapter configuration mode (M10x only) */
+#define GIGASET_CONFIG _IOWR(GIGASET_IOCTL, 1, int)
+
+/* set break characters (M105 only) */
+#define GIGASET_BRKCHARS _IOW(GIGASET_IOCTL, 2, unsigned char[6])
+
+/* get version information selected by arg[0] */
+#define GIGASET_VERSION _IOWR(GIGASET_IOCTL, 3, unsigned[4])
+/* values for GIGASET_VERSION arg[0] */
+#define GIGVER_DRIVER 0 /* get driver version */
+#define GIGVER_COMPAT 1 /* get interface compatibility version */
+#define GIGVER_FWBASE 2 /* get base station firmware version */
+
+#endif