diff --git a/drivers/isdn/hisax/st5481.h b/drivers/isdn/hisax/st5481.h
new file mode 100644
index 0000000..e8177b0
--- /dev/null
+++ b/drivers/isdn/hisax/st5481.h
@@ -0,0 +1,535 @@
+/*
+ * Driver for ST5481 USB ISDN modem
+ *
+ * Author       Frode Isaksen
+ * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
+ *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
+ * 
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#ifndef _ST5481_H_
+#define _ST5481_H_
+
+#include <linux/config.h>
+
+// USB IDs, the Product Id is in the range 0x4810-0x481F
+
+#define ST_VENDOR_ID 0x0483
+#define ST5481_PRODUCT_ID 0x4810
+#define ST5481_PRODUCT_ID_MASK 0xFFF0
+
+// ST5481 endpoints when using alternative setting 3 (2B+D).
+// To get the endpoint address, OR with 0x80 for IN endpoints.
+
+#define EP_CTRL   0x00U /* Control endpoint */
+#define EP_INT    0x01U /* Interrupt endpoint */
+#define EP_B1_OUT 0x02U /* B1 channel out */
+#define EP_B1_IN  0x03U /* B1 channel in */
+#define EP_B2_OUT 0x04U /* B2 channel out */
+#define EP_B2_IN  0x05U /* B2 channel in */
+#define EP_D_OUT  0x06U /* D channel out */
+#define EP_D_IN   0x07U /* D channel in */
+  
+// Number of isochronous packets. With 20 packets we get
+// 50 interrupts/sec for each endpoint.
+
+#define NUM_ISO_PACKETS_D      20
+#define NUM_ISO_PACKETS_B      20
+
+// Size of each isochronous packet.
+// In outgoing direction we need to match ISDN data rates:
+// D:  2 bytes / msec -> 16 kbit / s
+// B: 16 bytes / msec -> 64 kbit / s
+#define SIZE_ISO_PACKETS_D_IN  16
+#define SIZE_ISO_PACKETS_D_OUT 2
+#define SIZE_ISO_PACKETS_B_IN  32
+#define SIZE_ISO_PACKETS_B_OUT 8
+
+// If we overrun/underrun, we send one packet with +/- 2 bytes
+#define B_FLOW_ADJUST 2
+
+// Registers that are written using vendor specific device request
+// on endpoint 0. 
+
+#define LBA			0x02 /* S loopback */
+#define SET_DEFAULT		0x06 /* Soft reset */
+#define LBB			0x1D /* S maintenance loopback */
+#define STT			0x1e /* S force transmission signals */
+#define SDA_MIN			0x20 /* SDA-sin minimal value */
+#define SDA_MAX			0x21 /* SDA-sin maximal value */
+#define SDELAY_VALUE		0x22 /* Delay between Tx and Rx clock */
+#define IN_D_COUNTER		0x36 /* D receive channel fifo counter */
+#define OUT_D_COUNTER		0x37 /* D transmit channel fifo counter */
+#define IN_B1_COUNTER		0x38 /* B1 receive channel fifo counter */
+#define OUT_B1_COUNTER		0x39 /* B1 transmit channel fifo counter */
+#define IN_B2_COUNTER		0x3a /* B2 receive channel fifo counter */
+#define OUT_B2_COUNTER		0x3b /* B2 transmit channel fifo counter */
+#define FFCTRL_IN_D		0x3C /* D receive channel fifo threshold low */
+#define FFCTRH_IN_D		0x3D /* D receive channel fifo threshold high */
+#define FFCTRL_OUT_D		0x3E /* D transmit channel fifo threshold low */
+#define FFCTRH_OUT_D		0x3F /* D transmit channel fifo threshold high */
+#define FFCTRL_IN_B1		0x40 /* B1 receive channel fifo threshold low */
+#define FFCTRH_IN_B1		0x41 /* B1 receive channel fifo threshold high */
+#define FFCTRL_OUT_B1		0x42 /* B1 transmit channel fifo threshold low */
+#define FFCTRH_OUT_B1		0x43 /* B1 transmit channel fifo threshold high */
+#define FFCTRL_IN_B2		0x44 /* B2 receive channel fifo threshold low */
+#define FFCTRH_IN_B2		0x45 /* B2 receive channel fifo threshold high */
+#define FFCTRL_OUT_B2		0x46 /* B2 transmit channel fifo threshold low */
+#define FFCTRH_OUT_B2		0x47 /* B2 transmit channel fifo threshold high */
+#define MPMSK			0x4A /* Multi purpose interrupt MASK register */
+#define	FFMSK_D			0x4c /* D fifo interrupt MASK register */
+#define	FFMSK_B1		0x4e /* B1 fifo interrupt MASK register */
+#define	FFMSK_B2		0x50 /* B2 fifo interrupt MASK register */
+#define GPIO_DIR		0x52 /* GPIO pins direction registers */
+#define GPIO_OUT		0x53 /* GPIO pins output register */
+#define GPIO_IN			0x54 /* GPIO pins input register */ 
+#define TXCI			0x56 /* CI command to be transmitted */
+
+
+// Format of the interrupt packet received on endpoint 1:
+//
+// +--------+--------+--------+--------+--------+--------+
+// !MPINT   !FFINT_D !FFINT_B1!FFINT_B2!CCIST   !GPIO_INT!
+// +--------+--------+--------+--------+--------+--------+
+
+// Offsets in the interrupt packet
+
+#define MPINT			0
+#define FFINT_D			1
+#define FFINT_B1		2
+#define FFINT_B2		3
+#define CCIST			4
+#define GPIO_INT		5
+#define INT_PKT_SIZE            6
+
+// MPINT
+#define LSD_INT                 0x80 /* S line activity detected */
+#define RXCI_INT		0x40 /* Indicate primitive arrived */
+#define	DEN_INT			0x20 /* Signal enabling data out of D Tx fifo */
+#define DCOLL_INT		0x10 /* D channel collision */
+#define AMIVN_INT		0x04 /* AMI violation number reached 2 */
+#define INFOI_INT		0x04 /* INFOi changed */
+#define DRXON_INT               0x02 /* Reception channel active */
+#define GPCHG_INT               0x01 /* GPIO pin value changed */
+
+// FFINT_x
+#define IN_OVERRUN		0x80 /* In fifo overrun */
+#define OUT_UNDERRUN		0x40 /* Out fifo underrun */
+#define IN_UP			0x20 /* In fifo thresholdh up-crossed */
+#define IN_DOWN			0x10 /* In fifo thresholdl down-crossed */
+#define OUT_UP			0x08 /* Out fifo thresholdh up-crossed */
+#define OUT_DOWN		0x04 /* Out fifo thresholdl down-crossed */
+#define IN_COUNTER_ZEROED	0x02 /* In down-counter reached 0 */
+#define OUT_COUNTER_ZEROED	0x01 /* Out down-counter reached 0 */
+
+#define ANY_REC_INT	(IN_OVERRUN+IN_UP+IN_DOWN+IN_COUNTER_ZEROED)
+#define ANY_XMIT_INT	(OUT_UNDERRUN+OUT_UP+OUT_DOWN+OUT_COUNTER_ZEROED)
+
+
+// Level 1 commands that are sent using the TXCI device request
+#define ST5481_CMD_DR		 0x0 /* Deactivation Request */
+#define ST5481_CMD_RES		 0x1 /* state machine RESet */
+#define ST5481_CMD_TM1		 0x2 /* Test Mode 1 */
+#define ST5481_CMD_TM2		 0x3 /* Test Mode 2 */
+#define ST5481_CMD_PUP		 0x7 /* Power UP */
+#define ST5481_CMD_AR8		 0x8 /* Activation Request class 1 */
+#define ST5481_CMD_AR10		 0x9 /* Activation Request class 2 */
+#define ST5481_CMD_ARL		 0xA /* Activation Request Loopback */
+#define ST5481_CMD_PDN		 0xF /* Power DoWn */
+
+// Turn on/off the LEDs using the GPIO device request.
+// To use the B LEDs, number_of_leds must be set to 4
+#define B1_LED		0x10U
+#define B2_LED		0x20U
+#define GREEN_LED	0x40U
+#define RED_LED	        0x80U
+
+// D channel out states
+enum {
+	ST_DOUT_NONE,
+
+	ST_DOUT_SHORT_INIT,
+	ST_DOUT_SHORT_WAIT_DEN,
+
+	ST_DOUT_LONG_INIT,
+	ST_DOUT_LONG_WAIT_DEN,
+	ST_DOUT_NORMAL,
+
+	ST_DOUT_WAIT_FOR_UNDERRUN,
+        ST_DOUT_WAIT_FOR_NOT_BUSY,
+	ST_DOUT_WAIT_FOR_STOP,
+	ST_DOUT_WAIT_FOR_RESET,
+};
+
+#define DOUT_STATE_COUNT (ST_DOUT_WAIT_FOR_RESET + 1)
+
+// D channel out events
+enum {
+	EV_DOUT_START_XMIT,
+	EV_DOUT_COMPLETE,
+	EV_DOUT_DEN,
+	EV_DOUT_RESETED,
+	EV_DOUT_STOPPED,
+	EV_DOUT_COLL,
+	EV_DOUT_UNDERRUN,
+};
+
+#define DOUT_EVENT_COUNT (EV_DOUT_UNDERRUN + 1)
+
+// ----------------------------------------------------------------------
+
+enum {
+	ST_L1_F3,
+	ST_L1_F4,
+	ST_L1_F6,
+	ST_L1_F7,
+	ST_L1_F8,
+};
+
+#define L1_STATE_COUNT (ST_L1_F8+1)
+
+// The first 16 entries match the Level 1 indications that 
+// are found at offset 4 (CCIST) in the interrupt packet
+
+enum {
+	EV_IND_DP,  // 0000 Deactivation Pending
+	EV_IND_1,   // 0001
+	EV_IND_2,   // 0010
+	EV_IND_3,   // 0011
+	EV_IND_RSY, // 0100 ReSYnchronizing
+	EV_IND_5,   // 0101
+	EV_IND_6,   // 0110
+	EV_IND_7,   // 0111
+	EV_IND_AP,  // 1000 Activation Pending
+	EV_IND_9,   // 1001
+	EV_IND_10,  // 1010
+	EV_IND_11,  // 1011
+	EV_IND_AI8, // 1100 Activation Indication class 8
+	EV_IND_AI10,// 1101 Activation Indication class 10
+	EV_IND_AIL, // 1110 Activation Indication Loopback
+	EV_IND_DI,  // 1111 Deactivation Indication
+	EV_PH_ACTIVATE_REQ,
+	EV_PH_DEACTIVATE_REQ,
+	EV_TIMER3,
+};
+
+#define L1_EVENT_COUNT (EV_TIMER3 + 1)
+
+#define ERR(format, arg...) \
+printk(KERN_ERR "%s:%s: " format "\n" , __FILE__,  __FUNCTION__ , ## arg)
+
+#define WARN(format, arg...) \
+printk(KERN_WARNING "%s:%s: " format "\n" , __FILE__,  __FUNCTION__ , ## arg)
+
+#define INFO(format, arg...) \
+printk(KERN_INFO "%s:%s: " format "\n" , __FILE__,  __FUNCTION__ , ## arg)
+
+#include "isdnhdlc.h"
+#include "fsm.h"
+#include "hisax_if.h"
+#include <linux/skbuff.h>
+
+/* ======================================================================
+ * FIFO handling
+ */
+
+/* Generic FIFO structure */
+struct fifo {
+	u_char r,w,count,size;
+	spinlock_t lock;
+};
+
+/*
+ * Init an FIFO
+ */
+static inline void fifo_init(struct fifo *fifo, int size)
+{
+	fifo->r = fifo->w = fifo->count = 0;
+	fifo->size = size;
+	spin_lock_init(&fifo->lock);
+}
+
+/*
+ * Add an entry to the FIFO
+ */
+static inline int fifo_add(struct fifo *fifo)
+{
+	unsigned long flags;
+	int index;
+
+	if (!fifo) {
+		return -1;
+	}
+
+	spin_lock_irqsave(&fifo->lock, flags);
+	if (fifo->count == fifo->size) {
+		// FIFO full
+		index = -1;
+	} else {
+		// Return index where to get the next data to add to the FIFO
+		index = fifo->w++ & (fifo->size-1);
+		fifo->count++;
+	}
+	spin_unlock_irqrestore(&fifo->lock, flags);
+	return index;
+}
+
+/*
+ * Remove an entry from the FIFO with the index returned.
+ */
+static inline int fifo_remove(struct fifo *fifo)
+{
+	unsigned long flags;
+	int index;
+
+	if (!fifo) {
+		return -1;
+	}
+
+	spin_lock_irqsave(&fifo->lock, flags);
+	if (!fifo->count) {
+		// FIFO empty
+		index = -1;
+	} else {
+		// Return index where to get the next data from the FIFO
+		index = fifo->r++ & (fifo->size-1);
+		fifo->count--;
+	}
+	spin_unlock_irqrestore(&fifo->lock, flags);
+
+	return index;
+}
+
+/* ======================================================================
+ * control pipe
+ */
+typedef void (*ctrl_complete_t)(void *);
+
+typedef struct ctrl_msg {
+	struct usb_ctrlrequest dr;
+	ctrl_complete_t complete;
+	void *context;
+} ctrl_msg; 
+
+/* FIFO of ctrl messages waiting to be sent */
+#define MAX_EP0_MSG 16
+struct ctrl_msg_fifo {
+	struct fifo f;
+	struct ctrl_msg data[MAX_EP0_MSG];
+};	
+
+#define MAX_DFRAME_LEN_L1	300
+#define HSCX_BUFMAX	4096
+
+struct st5481_ctrl {
+	struct ctrl_msg_fifo msg_fifo;
+	unsigned long busy;
+	struct urb *urb;
+};
+
+struct st5481_intr {
+  //	struct evt_fifo evt_fifo;
+	struct urb *urb;
+};
+
+struct st5481_d_out {
+	struct isdnhdlc_vars hdlc_state;
+	struct urb *urb[2]; /* double buffering */
+	unsigned long busy;
+	struct sk_buff *tx_skb;
+	struct FsmInst fsm;
+};
+
+struct st5481_b_out {
+	struct isdnhdlc_vars hdlc_state;
+	struct urb *urb[2]; /* double buffering */
+	u_char flow_event;
+	u_long busy;
+	struct sk_buff *tx_skb;
+};
+
+struct st5481_in {
+	struct isdnhdlc_vars hdlc_state;
+	struct urb *urb[2]; /* double buffering */
+	int mode;
+	int bufsize;
+	unsigned int num_packets;
+	unsigned int packet_size;
+	unsigned char ep, counter;
+	unsigned char *rcvbuf;
+	struct st5481_adapter *adapter;
+	struct hisax_if *hisax_if;
+};
+
+int st5481_setup_in(struct st5481_in *in);
+void st5481_release_in(struct st5481_in *in);
+void st5481_in_mode(struct st5481_in *in, int mode);
+
+struct st5481_bcs {
+	struct hisax_b_if b_if;
+	struct st5481_adapter *adapter;
+	struct st5481_in b_in;
+	struct st5481_b_out b_out;
+	int channel;
+	int mode;
+};
+
+struct st5481_adapter {
+	struct list_head list;
+	int number_of_leds;
+	struct usb_device *usb_dev;
+	struct hisax_d_if hisax_d_if;
+
+	struct st5481_ctrl ctrl;
+	struct st5481_intr intr;
+	struct st5481_in d_in;
+	struct st5481_d_out d_out;
+
+	unsigned char leds;
+	unsigned int led_counter;
+
+	unsigned long event;
+
+	struct FsmInst l1m;
+	struct FsmTimer timer;
+
+	struct st5481_bcs bcs[2];
+};
+
+#define TIMER3_VALUE 7000
+
+/* ======================================================================
+ *
+ */
+
+/*
+ * Submit an URB with error reporting. This is a macro so
+ * the __FUNCTION__ returns the caller function name.
+ */
+#define SUBMIT_URB(urb, mem_flags) \
+({ \
+	int status; \
+	if ((status = usb_submit_urb(urb, mem_flags)) < 0) { \
+		WARN("usb_submit_urb failed,status=%d", status); \
+	} \
+        status; \
+})
+
+/*
+ * USB double buffering, return the URB index (0 or 1).
+ */
+static inline int get_buf_nr(struct urb *urbs[], struct urb *urb)
+{
+        return (urbs[0]==urb ? 0 : 1); 
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* B Channel */
+
+int  st5481_setup_b(struct st5481_bcs *bcs);
+void st5481_release_b(struct st5481_bcs *bcs);
+void st5481_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg);
+
+/* D Channel */
+
+int  st5481_setup_d(struct st5481_adapter *adapter);
+void st5481_release_d(struct st5481_adapter *adapter);
+void st5481_b_l2l1(struct hisax_if *b_if, int pr, void *arg);
+int  st5481_d_init(void);
+void st5481_d_exit(void);
+
+/* USB */
+void st5481_ph_command(struct st5481_adapter *adapter, unsigned int command);
+int st5481_setup_isocpipes(struct urb* urb[2], struct usb_device *dev, 
+			   unsigned int pipe, int num_packets,
+			   int packet_size, int buf_size,
+			   usb_complete_t complete, void *context);
+void st5481_release_isocpipes(struct urb* urb[2]);
+
+int  st5481_isoc_flatten(struct urb *urb);
+void st5481_usb_pipe_reset(struct st5481_adapter *adapter,
+		    u_char pipe, ctrl_complete_t complete, void *context);
+void st5481_usb_ctrl_msg(struct st5481_adapter *adapter,
+		  u8 request, u8 requesttype, u16 value, u16 index,
+		  ctrl_complete_t complete, void *context);
+void st5481_usb_device_ctrl_msg(struct st5481_adapter *adapter,
+			 u8 request, u16 value,
+			 ctrl_complete_t complete, void *context);
+int  st5481_setup_usb(struct st5481_adapter *adapter);
+void st5481_release_usb(struct st5481_adapter *adapter);
+void st5481_start(struct st5481_adapter *adapter);
+void st5481_stop(struct st5481_adapter *adapter);
+
+// ----------------------------------------------------------------------
+// debugging macros
+
+#define __debug_variable st5481_debug
+#include "hisax_debug.h"
+
+#ifdef CONFIG_HISAX_DEBUG
+
+extern int st5481_debug;
+
+#define DBG_ISO_PACKET(level,urb) \
+  if (level & __debug_variable) dump_iso_packet(__FUNCTION__,urb)
+
+static void __attribute__((unused))
+dump_iso_packet(const char *name, struct urb *urb)
+{
+	int i,j;
+	int len,ofs;
+	u_char *data;
+
+	printk(KERN_DEBUG "%s: packets=%d,errors=%d\n",
+	       name,urb->number_of_packets,urb->error_count);
+	for (i = 0; i  < urb->number_of_packets; ++i) {
+		if (urb->pipe & USB_DIR_IN) {
+			len = urb->iso_frame_desc[i].actual_length;
+		} else {
+			len = urb->iso_frame_desc[i].length;
+		}
+		ofs = urb->iso_frame_desc[i].offset;
+		printk(KERN_DEBUG "len=%.2d,ofs=%.3d ",len,ofs);
+		if (len) {
+			data = urb->transfer_buffer+ofs;
+			for (j=0; j < len; j++) {
+				printk ("%.2x", data[j]);
+			}
+		}
+		printk("\n");
+	}
+}
+
+static inline const char *ST5481_CMD_string(int evt)
+{
+	static char s[16];
+
+	switch (evt) {
+	case ST5481_CMD_DR: return "DR";
+	case ST5481_CMD_RES: return "RES";
+	case ST5481_CMD_TM1: return "TM1";
+	case ST5481_CMD_TM2: return "TM2";
+	case ST5481_CMD_PUP: return "PUP";
+	case ST5481_CMD_AR8: return "AR8";
+	case ST5481_CMD_AR10: return "AR10";
+	case ST5481_CMD_ARL: return "ARL";
+	case ST5481_CMD_PDN: return "PDN";
+	};
+	
+	sprintf(s,"0x%x",evt);
+	return s;
+}	
+
+#else
+
+#define DBG_ISO_PACKET(level,urb) do {} while (0)
+
+#endif
+
+
+
+#endif