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diff --git a/kernel/drivers/isdn/i4l/isdn_tty.h b/kernel/drivers/isdn/i4l/isdn_tty.h
new file mode 100644
index 000000000..a6f801d22
--- /dev/null
+++ b/kernel/drivers/isdn/i4l/isdn_tty.h
@@ -0,0 +1,120 @@
+/* $Id: isdn_tty.h,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
+ *
+ * header for Linux ISDN subsystem, tty related functions (linklevel).
+ *
+ * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
+ * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+
+#define DLE 0x10
+#define ETX 0x03
+#define DC4 0x14
+
+
+/*
+ * Definition of some special Registers of AT-Emulator
+ */
+#define REG_RINGATA   0
+#define REG_RINGCNT   1  /* ring counter register */
+#define REG_ESC       2
+#define REG_CR        3
+#define REG_LF        4
+#define REG_BS        5
+
+#define REG_WAITC     7
+
+#define REG_RESP     12  /* show response messages register */
+#define BIT_RESP      1  /* show response messages bit      */
+#define REG_RESPNUM  12  /* show numeric responses register */
+#define BIT_RESPNUM   2  /* show numeric responses bit      */
+#define REG_ECHO     12
+#define BIT_ECHO      4
+#define REG_DCD      12
+#define BIT_DCD       8
+#define REG_CTS      12
+#define BIT_CTS      16
+#define REG_DTRR     12
+#define BIT_DTRR     32
+#define REG_DSR      12
+#define BIT_DSR      64
+#define REG_CPPP     12
+#define BIT_CPPP    128
+
+#define REG_DXMT     13
+#define BIT_DXMT      1
+#define REG_T70      13
+#define BIT_T70       2
+#define BIT_T70_EXT  32
+#define REG_DTRHUP   13
+#define BIT_DTRHUP    4
+#define REG_RESPXT   13
+#define BIT_RESPXT    8
+#define REG_CIDONCE  13
+#define BIT_CIDONCE  16
+#define REG_RUNG     13  /* show RUNG message register      */
+#define BIT_RUNG     64  /* show RUNG message bit           */
+#define REG_DISPLAY  13
+#define BIT_DISPLAY 128
+
+#define REG_L2PROT   14
+#define REG_L3PROT   15
+#define REG_PSIZE    16
+#define REG_WSIZE    17
+#define REG_SI1      18
+#define REG_SI2      19
+#define REG_SI1I     20
+#define REG_PLAN     21
+#define REG_SCREEN   22
+
+#define REG_CPN      23
+#define BIT_CPN       1
+#define REG_CPNFCON  23
+#define BIT_CPNFCON   2
+#define REG_CDN      23
+#define BIT_CDN       4
+
+/* defines for result codes */
+#define RESULT_OK		0
+#define RESULT_CONNECT		1
+#define RESULT_RING		2
+#define RESULT_NO_CARRIER	3
+#define RESULT_ERROR		4
+#define RESULT_CONNECT64000	5
+#define RESULT_NO_DIALTONE	6
+#define RESULT_BUSY		7
+#define RESULT_NO_ANSWER	8
+#define RESULT_RINGING		9
+#define RESULT_NO_MSN_EAZ	10
+#define RESULT_VCON		11
+#define RESULT_RUNG		12
+
+#define TTY_IS_FCLASS1(info)						\
+	((info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_FAX) &&		\
+	 (info->emu.mdmreg[REG_L3PROT] == ISDN_PROTO_L3_FCLASS1))
+#define TTY_IS_FCLASS2(info)						\
+	((info->emu.mdmreg[REG_L2PROT] == ISDN_PROTO_L2_FAX) &&		\
+	 (info->emu.mdmreg[REG_L3PROT] == ISDN_PROTO_L3_FCLASS2))
+
+extern void isdn_tty_modem_escape(void);
+extern void isdn_tty_modem_ring(void);
+extern void isdn_tty_carrier_timeout(void);
+extern void isdn_tty_modem_xmit(void);
+extern int  isdn_tty_modem_init(void);
+extern void isdn_tty_exit(void);
+extern void isdn_tty_readmodem(void);
+extern int  isdn_tty_find_icall(int, int, setup_parm *);
+extern int  isdn_tty_stat_callback(int, isdn_ctrl *);
+extern int  isdn_tty_rcv_skb(int, int, int, struct sk_buff *);
+extern int  isdn_tty_capi_facility(capi_msg *cm);
+extern void isdn_tty_at_cout(char *, modem_info *);
+extern void isdn_tty_modem_hup(modem_info *, int);
+#ifdef CONFIG_ISDN_TTY_FAX
+extern int  isdn_tty_cmd_PLUSF_FAX(char **, modem_info *);
+extern int  isdn_tty_fax_command(modem_info *, isdn_ctrl *);
+extern void isdn_tty_fax_bitorder(modem_info *, struct sk_buff *);
+#endif