diff --git a/drivers/isdn/hisax/tei.c b/drivers/isdn/hisax/tei.c
new file mode 100644
index 0000000..082726d
--- /dev/null
+++ b/drivers/isdn/hisax/tei.c
@@ -0,0 +1,466 @@
+/* $Id: tei.c,v 2.20.2.3 2004/01/13 14:31:26 keil Exp $
+ *
+ * Author       Karsten Keil
+ *              based on the teles driver from Jan den Ouden
+ * Copyright    by Karsten Keil      <keil@isdn4linux.de>
+ * 
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * For changes and modifications please read
+ * Documentation/isdn/HiSax.cert
+ *
+ * Thanks to    Jan den Ouden
+ *              Fritz Elfert
+ *
+ */
+
+#include "hisax.h"
+#include "isdnl2.h"
+#include <linux/init.h>
+#include <linux/random.h>
+
+const char *tei_revision = "$Revision: 2.20.2.3 $";
+
+#define ID_REQUEST	1
+#define ID_ASSIGNED	2
+#define ID_DENIED	3
+#define ID_CHK_REQ	4
+#define ID_CHK_RES	5
+#define ID_REMOVE	6
+#define ID_VERIFY	7
+
+#define TEI_ENTITY_ID	0xf
+
+static struct Fsm teifsm;
+
+void tei_handler(struct PStack *st, u_char pr, struct sk_buff *skb);
+
+enum {
+	ST_TEI_NOP,
+	ST_TEI_IDREQ,
+	ST_TEI_IDVERIFY,
+};
+
+#define TEI_STATE_COUNT (ST_TEI_IDVERIFY+1)
+
+static char *strTeiState[] =
+{
+	"ST_TEI_NOP",
+	"ST_TEI_IDREQ",
+	"ST_TEI_IDVERIFY",
+};
+
+enum {
+	EV_IDREQ,
+	EV_ASSIGN,
+	EV_DENIED,
+	EV_CHKREQ,
+	EV_REMOVE,
+	EV_VERIFY,
+	EV_T202,
+};
+
+#define TEI_EVENT_COUNT (EV_T202+1)
+
+static char *strTeiEvent[] =
+{
+	"EV_IDREQ",
+	"EV_ASSIGN",
+	"EV_DENIED",
+	"EV_CHKREQ",
+	"EV_REMOVE",
+	"EV_VERIFY",
+	"EV_T202",
+};
+
+unsigned int
+random_ri(void)
+{
+	unsigned int x;
+
+	get_random_bytes(&x, sizeof(x));
+	return (x & 0xffff);
+}
+
+static struct PStack *
+findtei(struct PStack *st, int tei)
+{
+	struct PStack *ptr = *(st->l1.stlistp);
+
+	if (tei == 127)
+		return (NULL);
+
+	while (ptr)
+		if (ptr->l2.tei == tei)
+			return (ptr);
+		else
+			ptr = ptr->next;
+	return (NULL);
+}
+
+static void
+put_tei_msg(struct PStack *st, u_char m_id, unsigned int ri, u_char tei)
+{
+	struct sk_buff *skb;
+	u_char *bp;
+
+	if (!(skb = alloc_skb(8, GFP_ATOMIC))) {
+		printk(KERN_WARNING "HiSax: No skb for TEI manager\n");
+		return;
+	}
+	bp = skb_put(skb, 3);
+	bp[0] = (TEI_SAPI << 2);
+	bp[1] = (GROUP_TEI << 1) | 0x1;
+	bp[2] = UI;
+	bp = skb_put(skb, 5);
+	bp[0] = TEI_ENTITY_ID;
+	bp[1] = ri >> 8;
+	bp[2] = ri & 0xff;
+	bp[3] = m_id;
+	bp[4] = (tei << 1) | 1;
+	st->l2.l2l1(st, PH_DATA | REQUEST, skb);
+}
+
+static void
+tei_id_request(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (st->l2.tei != -1) {
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"assign request for allready asigned tei %d",
+			st->l2.tei);
+		return;
+	}
+	st->ma.ri = random_ri();
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"assign request ri %d", st->ma.ri);
+	put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
+	FsmChangeState(&st->ma.tei_m, ST_TEI_IDREQ);
+	FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 1);
+	st->ma.N202 = 3;
+}
+
+static void
+tei_id_assign(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *ost, *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	struct IsdnCardState *cs;
+	int ri, tei;
+
+	ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
+	tei = skb->data[4] >> 1;
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"identity assign ri %d tei %d", ri, tei);
+	if ((ost = findtei(st, tei))) {	/* same tei is in use */
+		if (ri != ost->ma.ri) {
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"possible duplicate assignment tei %d", tei);
+			ost->l2.l2tei(ost, MDL_ERROR | RESPONSE, NULL);
+		}
+	} else if (ri == st->ma.ri) {
+		FsmDelTimer(&st->ma.t202, 1);
+		FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
+		st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) tei);
+		cs = (struct IsdnCardState *) st->l1.hardware;
+		cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
+	}
+}
+
+static void
+tei_id_test_dup(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *ost, *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int tei, ri;
+
+	ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
+	tei = skb->data[4] >> 1;
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"foreign identity assign ri %d tei %d", ri, tei);
+	if ((ost = findtei(st, tei))) {	/* same tei is in use */
+		if (ri != ost->ma.ri) {	/* and it wasn't our request */
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"possible duplicate assignment tei %d", tei);
+			FsmEvent(&ost->ma.tei_m, EV_VERIFY, NULL);
+		}
+	} 
+}
+
+static void
+tei_id_denied(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int ri, tei;
+
+	ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
+	tei = skb->data[4] >> 1;
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"identity denied ri %d tei %d", ri, tei);
+}
+
+static void
+tei_id_chk_req(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int tei;
+
+	tei = skb->data[4] >> 1;
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"identity check req tei %d", tei);
+	if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
+		FsmDelTimer(&st->ma.t202, 4);
+		FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
+		put_tei_msg(st, ID_CHK_RES, random_ri(), st->l2.tei);
+	}
+}
+
+static void
+tei_id_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	struct IsdnCardState *cs;
+	int tei;
+
+	tei = skb->data[4] >> 1;
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"identity remove tei %d", tei);
+	if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
+		FsmDelTimer(&st->ma.t202, 5);
+		FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
+		st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
+		cs = (struct IsdnCardState *) st->l1.hardware;
+		cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
+	}
+}
+
+static void
+tei_id_verify(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (st->ma.debug)
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"id verify request for tei %d", st->l2.tei);
+	put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
+	FsmChangeState(&st->ma.tei_m, ST_TEI_IDVERIFY);
+	FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 2);
+	st->ma.N202 = 2;
+}
+
+static void
+tei_id_req_tout(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct IsdnCardState *cs;
+
+	if (--st->ma.N202) {
+		st->ma.ri = random_ri();
+		if (st->ma.debug)
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"assign req(%d) ri %d", 4 - st->ma.N202,
+				st->ma.ri);
+		put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
+		FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 3);
+	} else {
+		st->ma.tei_m.printdebug(&st->ma.tei_m, "assign req failed");
+		st->l3.l3l2(st, MDL_ERROR | RESPONSE, NULL);
+		cs = (struct IsdnCardState *) st->l1.hardware;
+		cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
+		FsmChangeState(fi, ST_TEI_NOP);
+	}
+}
+
+static void
+tei_id_ver_tout(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct IsdnCardState *cs;
+
+	if (--st->ma.N202) {
+		if (st->ma.debug)
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"id verify req(%d) for tei %d",
+				3 - st->ma.N202, st->l2.tei);
+		put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
+		FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 4);
+	} else {
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"verify req for tei %d failed", st->l2.tei);
+		st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
+		cs = (struct IsdnCardState *) st->l1.hardware;
+		cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
+		FsmChangeState(fi, ST_TEI_NOP);
+	}
+}
+
+static void
+tei_l1l2(struct PStack *st, int pr, void *arg)
+{
+	struct sk_buff *skb = arg;
+	int mt;
+
+	if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
+		dev_kfree_skb(skb);
+		return;
+	}
+
+	if (pr == (PH_DATA | INDICATION)) {
+		if (skb->len < 3) {
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"short mgr frame %ld/3", skb->len);
+		} else if ((skb->data[0] != ((TEI_SAPI << 2) | 2)) ||
+			   (skb->data[1] != ((GROUP_TEI << 1) | 1))) {
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"wrong mgr sapi/tei %x/%x",
+				skb->data[0], skb->data[1]);
+		} else if ((skb->data[2] & 0xef) != UI) {
+			st->ma.tei_m.printdebug(&st->ma.tei_m,
+				"mgr frame is not ui %x", skb->data[2]);
+		} else {
+			skb_pull(skb, 3);
+			if (skb->len < 5) {
+				st->ma.tei_m.printdebug(&st->ma.tei_m,
+					"short mgr frame %ld/5", skb->len);
+			} else if (skb->data[0] != TEI_ENTITY_ID) {
+				/* wrong management entity identifier, ignore */
+				st->ma.tei_m.printdebug(&st->ma.tei_m,
+					"tei handler wrong entity id %x",
+					skb->data[0]);
+			} else {
+				mt = skb->data[3];
+				if (mt == ID_ASSIGNED)
+					FsmEvent(&st->ma.tei_m, EV_ASSIGN, skb);
+				else if (mt == ID_DENIED)
+					FsmEvent(&st->ma.tei_m, EV_DENIED, skb);
+				else if (mt == ID_CHK_REQ)
+					FsmEvent(&st->ma.tei_m, EV_CHKREQ, skb);
+				else if (mt == ID_REMOVE)
+					FsmEvent(&st->ma.tei_m, EV_REMOVE, skb);
+				else {
+					st->ma.tei_m.printdebug(&st->ma.tei_m,
+						"tei handler wrong mt %x\n", mt);
+				}
+			}
+		}
+	} else {
+		st->ma.tei_m.printdebug(&st->ma.tei_m,
+			"tei handler wrong pr %x\n", pr);
+	}
+	dev_kfree_skb(skb);
+}
+
+static void
+tei_l2tei(struct PStack *st, int pr, void *arg)
+{
+	struct IsdnCardState *cs;
+
+	if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
+		if (pr == (MDL_ASSIGN | INDICATION)) {
+			if (st->ma.debug)
+				st->ma.tei_m.printdebug(&st->ma.tei_m,
+					"fixed assign tei %d", st->l2.tei);
+			st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) st->l2.tei);
+			cs = (struct IsdnCardState *) st->l1.hardware;
+			cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
+		}
+		return;
+	}
+	switch (pr) {
+		case (MDL_ASSIGN | INDICATION):
+			FsmEvent(&st->ma.tei_m, EV_IDREQ, arg);
+			break;
+		case (MDL_ERROR | REQUEST):
+			FsmEvent(&st->ma.tei_m, EV_VERIFY, arg);
+			break;
+		default:
+			break;
+	}
+}
+
+static void
+tei_debug(struct FsmInst *fi, char *fmt, ...)
+{
+	va_list args;
+	struct PStack *st = fi->userdata;
+
+	va_start(args, fmt);
+	VHiSax_putstatus(st->l1.hardware, "tei ", fmt, args);
+	va_end(args);
+}
+
+void
+setstack_tei(struct PStack *st)
+{
+	st->l2.l2tei = tei_l2tei;
+	st->ma.T202 = 2000;	/* T202  2000 milliseconds */
+	st->l1.l1tei = tei_l1l2;
+	st->ma.debug = 1;
+	st->ma.tei_m.fsm = &teifsm;
+	st->ma.tei_m.state = ST_TEI_NOP;
+	st->ma.tei_m.debug = 1;
+	st->ma.tei_m.userdata = st;
+	st->ma.tei_m.userint = 0;
+	st->ma.tei_m.printdebug = tei_debug;
+	FsmInitTimer(&st->ma.tei_m, &st->ma.t202);
+}
+
+void
+init_tei(struct IsdnCardState *cs, int protocol)
+{
+}
+
+void
+release_tei(struct IsdnCardState *cs)
+{
+	struct PStack *st = cs->stlist;
+
+	while (st) {
+		FsmDelTimer(&st->ma.t202, 1);
+		st = st->next;
+	}
+}
+
+static struct FsmNode TeiFnList[] __initdata =
+{
+	{ST_TEI_NOP, EV_IDREQ, tei_id_request},
+	{ST_TEI_NOP, EV_ASSIGN, tei_id_test_dup},
+	{ST_TEI_NOP, EV_VERIFY, tei_id_verify},
+	{ST_TEI_NOP, EV_REMOVE, tei_id_remove},
+	{ST_TEI_NOP, EV_CHKREQ, tei_id_chk_req},
+	{ST_TEI_IDREQ, EV_T202, tei_id_req_tout},
+	{ST_TEI_IDREQ, EV_ASSIGN, tei_id_assign},
+	{ST_TEI_IDREQ, EV_DENIED, tei_id_denied},
+	{ST_TEI_IDVERIFY, EV_T202, tei_id_ver_tout},
+	{ST_TEI_IDVERIFY, EV_REMOVE, tei_id_remove},
+	{ST_TEI_IDVERIFY, EV_CHKREQ, tei_id_chk_req},
+};
+
+#define TEI_FN_COUNT (sizeof(TeiFnList)/sizeof(struct FsmNode))
+
+int __init
+TeiNew(void)
+{
+	teifsm.state_count = TEI_STATE_COUNT;
+	teifsm.event_count = TEI_EVENT_COUNT;
+	teifsm.strEvent = strTeiEvent;
+	teifsm.strState = strTeiState;
+	return FsmNew(&teifsm, TeiFnList, TEI_FN_COUNT);
+}
+
+void
+TeiFree(void)
+{
+	FsmFree(&teifsm);
+}