diff --git a/include/linux/tty.h b/include/linux/tty.h
index 0161a8c..8427c9e 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -24,7 +24,27 @@
 #define NR_PTYS	CONFIG_LEGACY_PTY_COUNT   /* Number of legacy ptys */
 #define NR_UNIX98_PTY_DEFAULT	4096      /* Default maximum for Unix98 ptys */
 #define NR_UNIX98_PTY_MAX	(1 << MINORBITS) /* Absolute limit */
-#define NR_LDISCS		16
+#define NR_LDISCS		17
+
+/* line disciplines */
+#define N_TTY		0
+#define N_SLIP		1
+#define N_MOUSE		2
+#define N_PPP		3
+#define N_STRIP		4
+#define N_AX25		5
+#define N_X25		6	/* X.25 async */
+#define N_6PACK		7
+#define N_MASC		8	/* Reserved for Mobitex module <kaz@cafe.net> */
+#define N_R3964		9	/* Reserved for Simatic R3964 module */
+#define N_PROFIBUS_FDL	10	/* Reserved for Profibus <Dave@mvhi.com> */
+#define N_IRDA		11	/* Linux IrDa - http://irda.sourceforge.net/ */
+#define N_SMSBLOCK	12	/* SMS block mode - for talking to GSM data */
+				/* cards about SMS messages */
+#define N_HDLC		13	/* synchronous HDLC */
+#define N_SYNC_PPP	14	/* synchronous PPP */
+#define N_HCI		15	/* Bluetooth HCI UART */
+#define N_GIGASET_M101	16	/* Siemens Gigaset M101 serial DECT adapter */
 
 /*
  * This character is the same as _POSIX_VDISABLE: it cannot be used as