diff --git a/drivers/isdn/gigaset/proc.c b/drivers/isdn/gigaset/proc.c
new file mode 100644
index 000000000000..c6915fa2be6c
--- /dev/null
+++ b/drivers/isdn/gigaset/proc.c
@@ -0,0 +1,81 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers <Eilers.Stefan@epost.de>,
+ *                       Hansjoerg Lipp <hjlipp@web.de>,
+ *                       Tilman Schmidt <tilman@imap.cc>.
+ *
+ * =====================================================================
+ *	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.
+ * =====================================================================
+ * ToDo: ...
+ * =====================================================================
+ * Version: $Id: proc.c,v 1.5.2.13 2006/02/04 18:28:16 hjlipp Exp $
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/ctype.h>
+
+static ssize_t show_cidmode(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct cardstate *cs = usb_get_intfdata(intf);
+	return sprintf(buf, "%d\n", atomic_read(&cs->cidmode)); // FIXME use scnprintf for 13607 bit architectures (if PAGE_SIZE==4096)
+}
+
+static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct cardstate *cs = usb_get_intfdata(intf);
+	long int value;
+	char *end;
+
+	value = simple_strtol(buf, &end, 0);
+	while (*end)
+		if (!isspace(*end++))
+			return -EINVAL;
+	if (value < 0 || value > 1)
+			return -EINVAL;
+
+	if (down_interruptible(&cs->sem))
+		return -ERESTARTSYS; // FIXME -EINTR?
+
+	cs->waiting = 1;
+	if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
+		               NULL, value, NULL)) {
+		cs->waiting = 0;
+		up(&cs->sem);
+		return -ENOMEM;
+	}
+
+	dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
+	gigaset_schedule_event(cs);
+
+	wait_event(cs->waitqueue, !cs->waiting);
+
+	up(&cs->sem);
+
+	return count;
+}
+
+static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
+
+/* free sysfs for device */
+void gigaset_free_dev_sysfs(struct usb_interface *interface)
+{
+	dbg(DEBUG_INIT, "removing sysfs entries");
+	device_remove_file(&interface->dev, &dev_attr_cidmode);
+}
+EXPORT_SYMBOL_GPL(gigaset_free_dev_sysfs);
+
+/* initialize sysfs for device */
+void gigaset_init_dev_sysfs(struct usb_interface *interface)
+{
+	dbg(DEBUG_INIT, "setting up sysfs");
+	device_create_file(&interface->dev, &dev_attr_cidmode);
+}
+EXPORT_SYMBOL_GPL(gigaset_init_dev_sysfs);