diff --git a/drivers/isdn/hisax/st5481_b.c b/drivers/isdn/hisax/st5481_b.c
index 0074b60..95b1cdd 100644
--- a/drivers/isdn/hisax/st5481_b.c
+++ b/drivers/isdn/hisax/st5481_b.c
@@ -218,7 +218,10 @@
 	if (bcs->mode != L1_MODE_NULL) {
 		// Open the B channel
 		if (bcs->mode != L1_MODE_TRANS) {
-			isdnhdlc_out_init(&b_out->hdlc_state, 0, bcs->mode == L1_MODE_HDLC_56K);
+			u32 features = HDLC_BITREVERSE;
+			if (bcs->mode == L1_MODE_HDLC_56K)
+				features |= HDLC_56KBIT;
+			isdnhdlc_out_init(&b_out->hdlc_state, features);
 		}
 		st5481_usb_pipe_reset(adapter, (bcs->channel+1)*2, NULL, NULL);
 	
diff --git a/drivers/isdn/hisax/st5481_d.c b/drivers/isdn/hisax/st5481_d.c
index 077991c..39e8e49 100644
--- a/drivers/isdn/hisax/st5481_d.c
+++ b/drivers/isdn/hisax/st5481_d.c
@@ -417,7 +417,7 @@
 
 	DBG(2,"len=%d",skb->len);
 
-	isdnhdlc_out_init(&d_out->hdlc_state, 1, 0);
+	isdnhdlc_out_init(&d_out->hdlc_state, HDLC_DCHANNEL | HDLC_BITREVERSE);
 
 	if (test_and_set_bit(buf_nr, &d_out->busy)) {
 		WARNING("ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
diff --git a/drivers/isdn/hisax/st5481_usb.c b/drivers/isdn/hisax/st5481_usb.c
index 2b3a055..10d41c5 100644
--- a/drivers/isdn/hisax/st5481_usb.c
+++ b/drivers/isdn/hisax/st5481_usb.c
@@ -637,10 +637,13 @@
 	usb_unlink_urb(in->urb[1]);
 
 	if (in->mode != L1_MODE_NULL) {
-		if (in->mode != L1_MODE_TRANS)
-			isdnhdlc_rcv_init(&in->hdlc_state,
-				in->mode == L1_MODE_HDLC_56K);
-		
+		if (in->mode != L1_MODE_TRANS) {
+			u32 features = HDLC_BITREVERSE;
+
+			if (in->mode == L1_MODE_HDLC_56K)
+				features |= HDLC_56KBIT;
+			isdnhdlc_rcv_init(&in->hdlc_state, features);
+		}
 		st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
 		st5481_usb_device_ctrl_msg(in->adapter, in->counter,
 					   in->packet_size,
diff --git a/drivers/isdn/i4l/isdnhdlc.c b/drivers/isdn/i4l/isdnhdlc.c
index b80e55a..df345ce 100644
--- a/drivers/isdn/i4l/isdnhdlc.c
+++ b/drivers/isdn/i4l/isdnhdlc.c
@@ -2,6 +2,7 @@
  * isdnhdlc.c  --  General purpose ISDN HDLC decoder.
  *
  * Copyright (C)
+ *	2009	Karsten Keil		<keil@b1-systems.de>
  *	2002	Wolfgang Mües		<wolfgang@iksw-muees.de>
  *	2001	Frode Isaksen		<fisaksen@bewan.com>
  *      2001	Kai Germaschewski	<kai.germaschewski@gmx.de>
@@ -25,6 +26,7 @@
 #include <linux/init.h>
 #include <linux/crc-ccitt.h>
 #include <linux/isdn/hdlc.h>
+#include <linux/bitrev.h>
 
 /*-------------------------------------------------------------------*/
 
@@ -48,35 +50,21 @@
 	HDLC_SENDFLAG_B1A6, HDLC_SENDFLAG_B7, STOPPED
 };
 
-void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, int do_adapt56)
+void isdnhdlc_rcv_init(struct isdnhdlc_vars *hdlc, u32 features)
 {
-	hdlc->bit_shift = 0;
-	hdlc->hdlc_bits1 = 0;
-	hdlc->data_bits = 0;
-	hdlc->ffbit_shift = 0;
-	hdlc->data_received = 0;
+	memset(hdlc, 0, sizeof(struct isdnhdlc_vars));
 	hdlc->state = HDLC_GET_DATA;
-	hdlc->do_adapt56 = do_adapt56;
-	hdlc->dchannel = 0;
-	hdlc->crc = 0;
-	hdlc->cbin = 0;
-	hdlc->shift_reg = 0;
-	hdlc->ffvalue = 0;
-	hdlc->dstpos = 0;
+	if (features & HDLC_56KBIT)
+		hdlc->do_adapt56 = 1;
+	if (features & HDLC_BITREVERSE)
+		hdlc->do_bitreverse = 1;
 }
 EXPORT_SYMBOL(isdnhdlc_out_init);
 
-void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, int is_d_channel,
-	int do_adapt56)
+void isdnhdlc_out_init(struct isdnhdlc_vars *hdlc, u32 features)
 {
-	hdlc->bit_shift = 0;
-	hdlc->hdlc_bits1 = 0;
-	hdlc->data_bits = 0;
-	hdlc->ffbit_shift = 0;
-	hdlc->data_received = 0;
-	hdlc->do_closing = 0;
-	hdlc->ffvalue = 0;
-	if (is_d_channel) {
+	memset(hdlc, 0, sizeof(struct isdnhdlc_vars));
+	if (features & HDLC_DCHANNEL) {
 		hdlc->dchannel = 1;
 		hdlc->state = HDLC_SEND_FIRST_FLAG;
 	} else {
@@ -85,16 +73,13 @@
 		hdlc->ffvalue = 0x7e;
 	}
 	hdlc->cbin = 0x7e;
-	hdlc->bit_shift = 0;
-	if (do_adapt56) {
+	if (features & HDLC_56KBIT) {
 		hdlc->do_adapt56 = 1;
-		hdlc->data_bits = 0;
 		hdlc->state = HDLC_SENDFLAG_B0;
-	} else {
-		hdlc->do_adapt56 = 0;
+	} else
 		hdlc->data_bits = 8;
-	}
-	hdlc->shift_reg = 0;
+	if (features & HDLC_BITREVERSE)
+		hdlc->do_bitreverse = 1;
 }
 EXPORT_SYMBOL(isdnhdlc_rcv_init);
 
@@ -188,7 +173,11 @@
 
 	while (slen > 0) {
 		if (hdlc->bit_shift == 0) {
-			hdlc->cbin = *src++;
+			/* the code is for bitreverse streams */
+			if (hdlc->do_bitreverse == 0)
+				hdlc->cbin = bitrev8(*src++);
+			else
+				hdlc->cbin = *src++;
 			slen--;
 			hdlc->bit_shift = 8;
 			if (hdlc->do_adapt56)
@@ -405,12 +394,15 @@
 		case STOPPED:
 			while (dsize--)
 				*dst++ = 0xff;
-
 			return dsize;
 		case HDLC_SEND_FAST_FLAG:
 			hdlc->do_closing = 0;
 			if (slen == 0) {
-				*dst++ = hdlc->ffvalue;
+				/* the code is for bitreverse streams */
+				if (hdlc->do_bitreverse == 0)
+					*dst++ = bitrev8(hdlc->ffvalue);
+				else
+					*dst++ = hdlc->ffvalue;
 				len++;
 				dsize--;
 				break;
@@ -594,7 +586,11 @@
 				hdlc->cbin = 0x7e;
 				hdlc->state = HDLC_SEND_FIRST_FLAG;
 			} else {
-				*dst++ = hdlc->cbin;
+				/* the code is for bitreverse streams */
+				if (hdlc->do_bitreverse == 0)
+					*dst++ = bitrev8(hdlc->cbin);
+				else
+					*dst++ = hdlc->cbin;
 				hdlc->bit_shift = 0;
 				hdlc->data_bits = 0;
 				len++;
@@ -612,7 +608,11 @@
 			}
 		}
 		if (hdlc->data_bits == 8) {
-			*dst++ = hdlc->cbin;
+			/* the code is for bitreverse streams */
+			if (hdlc->do_bitreverse == 0)
+				*dst++ = bitrev8(hdlc->cbin);
+			else
+				*dst++ = hdlc->cbin;
 			hdlc->data_bits = 0;
 			len++;
 			dsize--;