text: /*
   * hfc_usb.c
   *
   * $Id: hfc_usb.c,v 1.1.1.1 2007-05-25 06:50:10 bruce Exp $
   *
   * modular HiSax ISDN driver for Colognechip HFC-S USB chip
   *
   * Authors : Peter Sprenger  (sprenger@moving-bytes.de)
   *           Martin Bachem   (info@colognechip.com)
   *
   *           based on the first hfc_usb driver of
   *           Werner Cornelius (werner@isdn-development.de)
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2, or (at your option)
   * any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   * See Version Histroy at the bottom of this file
   *
  */
  
  #include <linux/types.h>
  #include <linux/stddef.h>
  #include <linux/timer.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/kernel_stat.h>
  #include <linux/usb.h>
  #include <linux/kernel.h>
  #include <linux/smp_lock.h>
  #include "hisax.h"
  #include "hisax_if.h"
  #include "hfc_usb.h"
  
  static const char *hfcusb_revision =
      "$Revision: 1.1.1.1 $ $Date: 2007-05-25 06:50:10 $ ";
  
  /* Hisax debug support
  * use "modprobe debug=x" where x is bitfield of USB_DBG & ISDN_DBG
  */
  #ifdef CONFIG_HISAX_DEBUG
  #include <linux/moduleparam.h>
  #define __debug_variable hfc_debug
  #include "hisax_debug.h"
  static u_int debug;
  module_param(debug, uint, 0);
  static int hfc_debug;
  #endif
  
  /* private vendor specific data */
  typedef struct {
  	__u8 led_scheme;	// led display scheme
  	signed short led_bits[8];	// array of 8 possible LED bitmask settings
  	char *vend_name;	// device name
  } hfcsusb_vdata;
  
  /****************************************/
  /* data defining the devices to be used */
  /****************************************/
  static struct usb_device_id hfcusb_idtab[] = {
  	{
  	 USB_DEVICE(0x0959, 0x2bd0),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_OFF, {4, 0, 2, 1},
  			   "ISDN USB TA (Cologne Chip HFC-S USB based)"}),
  	},
  	{
  	 USB_DEVICE(0x0675, 0x1688),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {1, 2, 0, 0},
  			   "DrayTek miniVigor 128 USB ISDN TA"}),
  	},
  	{
  	 USB_DEVICE(0x07b0, 0x0007),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {0x80, -64, -32, -16},
  			   "Billion tiny USB ISDN TA 128"}),
  	},
  	{
  	 USB_DEVICE(0x0742, 0x2008),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {4, 0, 2, 1},
  			   "Stollmann USB TA"}),
  	 },
  	{
  	 USB_DEVICE(0x0742, 0x2009),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {4, 0, 2, 1},
  			   "Aceex USB ISDN TA"}),
  	 },
  	{
  	 USB_DEVICE(0x0742, 0x200A),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {4, 0, 2, 1},
  			   "OEM USB ISDN TA"}),
  	 },
  	{
  	 USB_DEVICE(0x08e3, 0x0301),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {2, 0, 1, 4},
  			   "Olitec USB RNIS"}),
  	 },
  	{
  	 USB_DEVICE(0x07fa, 0x0846),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {0x80, -64, -32, -16},
  			   "Bewan Modem RNIS USB"}),
  	 },
  	{
  	 USB_DEVICE(0x07fa, 0x0847),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {0x80, -64, -32, -16},
  			   "Djinn Numeris USB"}),
  	 },
  	{
  	 USB_DEVICE(0x07b0, 0x0006),
  	 .driver_info = (unsigned long) &((hfcsusb_vdata)
  			  {LED_SCHEME1, {0x80, -64, -32, -16},
  			   "Twister ISDN TA"}),
  	 },
  	{ }
  };
  
  /***************************************************************/
  /* structure defining input+output fifos (interrupt/bulk mode) */
  /***************************************************************/
  struct usb_fifo;		/* forward definition */
  typedef struct iso_urb_struct {
  	struct urb *purb;
  	__u8 buffer[ISO_BUFFER_SIZE];	/* buffer incoming/outgoing data */
  	struct usb_fifo *owner_fifo;	/* pointer to owner fifo */
  } iso_urb_struct;
  
  
  struct hfcusb_data;		/* forward definition */
  typedef struct usb_fifo {
  	int fifonum;		/* fifo index attached to this structure */
  	int active;		/* fifo is currently active */
  	struct hfcusb_data *hfc;	/* pointer to main structure */
  	int pipe;		/* address of endpoint */
  	__u8 usb_packet_maxlen;	/* maximum length for usb transfer */
  	unsigned int max_size;	/* maximum size of receive/send packet */
  	__u8 intervall;		/* interrupt interval */
  	struct sk_buff *skbuff;	/* actual used buffer */
  	struct urb *urb;	/* transfer structure for usb routines */
  	__u8 buffer[128];	/* buffer incoming/outgoing data */
  	int bit_line;		/* how much bits are in the fifo? */
  
  	volatile __u8 usb_transfer_mode;	/* switched between ISO and INT */
  	iso_urb_struct iso[2];	/* need two urbs to have one always for pending */
  	struct hisax_if *hif;	/* hisax interface */
  	int delete_flg;		/* only delete skbuff once */
  	int last_urblen;	/* remember length of last packet */
  
  } usb_fifo;
  
  /*********************************************/
  /* structure holding all data for one device */
  /*********************************************/
  typedef struct hfcusb_data {
  	/* HiSax Interface for loadable Layer1 drivers */
  	struct hisax_d_if d_if;	/* see hisax_if.h */
  	struct hisax_b_if b_if[2];	/* see hisax_if.h */
  	int protocol;
  
  	struct usb_device *dev;	/* our device */
  	int if_used;		/* used interface number */
  	int alt_used;		/* used alternate config */
  	int ctrl_paksize;	/* control pipe packet size */
  	int ctrl_in_pipe, ctrl_out_pipe;	/* handles for control pipe */
  	int cfg_used;		/* configuration index used */
  	int vend_idx;		/* vendor found */
  	int b_mode[2];		/* B-channel mode */
  	int l1_activated;	/* layer 1 activated */
  	int disc_flag;		/* 'true' if device was disonnected to avoid some USB actions */
  	int packet_size, iso_packet_size;
  
  	/* control pipe background handling */
  	ctrl_buft ctrl_buff[HFC_CTRL_BUFSIZE];	/* buffer holding queued data */
  	volatile int ctrl_in_idx, ctrl_out_idx, ctrl_cnt;	/* input/output pointer + count */
  	struct urb *ctrl_urb;	/* transfer structure for control channel */
  
  	struct usb_ctrlrequest ctrl_write;	/* buffer for control write request */
  	struct usb_ctrlrequest ctrl_read;	/* same for read request */
  
  	__u8 old_led_state, led_state, led_new_data, led_b_active;
  
  	volatile __u8 threshold_mask;	/* threshold actually reported */
  	volatile __u8 bch_enables;	/* or mask for sctrl_r and sctrl register values */
  
  	usb_fifo fifos[HFCUSB_NUM_FIFOS];	/* structure holding all fifo data */
  
  	volatile __u8 l1_state;	/* actual l1 state */
  	struct timer_list t3_timer;	/* timer 3 for activation/deactivation */
  	struct timer_list t4_timer;	/* timer 4 for activation/deactivation */
  } hfcusb_data;
  
  
  static void collect_rx_frame(usb_fifo * fifo, __u8 * data, int len,
  			     int finish);
  
  
  static inline const char *
  symbolic(struct hfcusb_symbolic_list list[], const int num)
  {
  	int i;
  	for (i = 0; list[i].name != NULL; i++)
  		if (list[i].num == num)
  			return (list[i].name);
  	return "<unknown ERROR>";
  }
  
  
  /******************************************************/
  /* start next background transfer for control channel */
  /******************************************************/
  static void
  ctrl_start_transfer(hfcusb_data * hfc)
  {
  	if (hfc->ctrl_cnt) {
  		hfc->ctrl_urb->pipe = hfc->ctrl_out_pipe;
  		hfc->ctrl_urb->setup_packet = (u_char *) & hfc->ctrl_write;
  		hfc->ctrl_urb->transfer_buffer = NULL;
  		hfc->ctrl_urb->transfer_buffer_length = 0;
  		hfc->ctrl_write.wIndex =
  		    cpu_to_le16(hfc->ctrl_buff[hfc->ctrl_out_idx].hfc_reg);
  		hfc->ctrl_write.wValue =
  		    cpu_to_le16(hfc->ctrl_buff[hfc->ctrl_out_idx].reg_val);
  
  		usb_submit_urb(hfc->ctrl_urb, GFP_ATOMIC);	/* start transfer */
  	}
  }				/* ctrl_start_transfer */
  
  /************************************/
  /* queue a control transfer request */
  /* return 0 on success.             */
  /************************************/
  static int
  queue_control_request(hfcusb_data * hfc, __u8 reg, __u8 val, int action)
  {
  	ctrl_buft *buf;
  
  	if (hfc->ctrl_cnt >= HFC_CTRL_BUFSIZE)
  		return (1);	/* no space left */
  	buf = &hfc->ctrl_buff[hfc->ctrl_in_idx];	/* pointer to new index */
  	buf->hfc_reg = reg;
  	buf->reg_val = val;
  	buf->action = action;
  	if (++hfc->ctrl_in_idx >= HFC_CTRL_BUFSIZE)
  		hfc->ctrl_in_idx = 0;	/* pointer wrap */
  	if (++hfc->ctrl_cnt == 1)
  		ctrl_start_transfer(hfc);
  	return (0);
  }				/* queue_control_request */
  
  static int
  control_action_handler(hfcusb_data * hfc, int reg, int val, int action)
  {
  	if (!action)
  		return (1);	/* no action defined */
  	return (0);
  }
  
  /***************************************************************/
  /* control completion routine handling background control cmds */
  /***************************************************************/
  static void
  ctrl_complete(struct urb *urb)
  {
  	hfcusb_data *hfc = (hfcusb_data *) urb->context;
  	ctrl_buft *buf;
  
  	urb->dev = hfc->dev;
  	if (hfc->ctrl_cnt) {
  		buf = &hfc->ctrl_buff[hfc->ctrl_out_idx];
  		control_action_handler(hfc, buf->hfc_reg, buf->reg_val,
  				       buf->action);
  
  		hfc->ctrl_cnt--;	/* decrement actual count */
  		if (++hfc->ctrl_out_idx >= HFC_CTRL_BUFSIZE)
  			hfc->ctrl_out_idx = 0;	/* pointer wrap */
  
  		ctrl_start_transfer(hfc);	/* start next transfer */
  	}
  }				/* ctrl_complete */
  
  /***************************************************/
  /* write led data to auxport & invert if necessary */
  /***************************************************/
  static void
  write_led(hfcusb_data * hfc, __u8 led_state)
  {
  	if (led_state != hfc->old_led_state) {
  		hfc->old_led_state = led_state;
  		queue_control_request(hfc, HFCUSB_P_DATA, led_state, 1);
  	}
  }
  
  /**************************/
  /* handle LED bits        */
  /**************************/
  static void
  set_led_bit(hfcusb_data * hfc, signed short led_bits, int unset)
  {
  	if (unset) {
  		if (led_bits < 0)
  			hfc->led_state |= abs(led_bits);
  		else
  			hfc->led_state &= ~led_bits;
  	} else {
  		if (led_bits < 0)
  			hfc->led_state &= ~abs(led_bits);
  		else
  			hfc->led_state |= led_bits;
  	}
  }
  
  /**************************/
  /* handle LED requests    */
  /**************************/
  static void
  handle_led(hfcusb_data * hfc, int event)
  {
  	hfcsusb_vdata *driver_info =
  	    (hfcsusb_vdata *) hfcusb_idtab[hfc->vend_idx].driver_info;
  
  	/* if no scheme -> no LED action */
  	if (driver_info->led_scheme == LED_OFF)
  		return;
  
  	switch (event) {
  		case LED_POWER_ON:
  			set_led_bit(hfc, driver_info->led_bits[0],
  				    0);
  			set_led_bit(hfc, driver_info->led_bits[1],
  				    1);
  			set_led_bit(hfc, driver_info->led_bits[2],
  				    1);
  			set_led_bit(hfc, driver_info->led_bits[3],
  				    1);
  			break;
  		case LED_POWER_OFF:	/* no Power off handling */
  			break;
  		case LED_S0_ON:
  			set_led_bit(hfc, driver_info->led_bits[1],
  				    0);
  			break;
  		case LED_S0_OFF:
  			set_led_bit(hfc, driver_info->led_bits[1],
  				    1);
  			break;
  		case LED_B1_ON:
  			set_led_bit(hfc, driver_info->led_bits[2],
  				    0);
  			break;
  		case LED_B1_OFF:
  			set_led_bit(hfc, driver_info->led_bits[2],
  				    1);
  			break;
  		case LED_B2_ON:
  			set_led_bit(hfc, driver_info->led_bits[3],
  				    0);
  			break;
  		case LED_B2_OFF:
  			set_led_bit(hfc, driver_info->led_bits[3],
  				    1);
  			break;
  	}
  	write_led(hfc, hfc->led_state);
  }
  
  /********************************/
  /* called when timer t3 expires */
  /********************************/
  static void
  l1_timer_expire_t3(hfcusb_data * hfc)
  {
  	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
  			   NULL);
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(ISDN_DBG,
  	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T3 expire)");
  #endif
  	hfc->l1_activated = false;
  	handle_led(hfc, LED_S0_OFF);
  	/* deactivate : */
  	queue_control_request(hfc, HFCUSB_STATES, 0x10, 1);
  	queue_control_request(hfc, HFCUSB_STATES, 3, 1);
  }
  
  /********************************/
  /* called when timer t4 expires */
  /********************************/
  static void
  l1_timer_expire_t4(hfcusb_data * hfc)
  {
  	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
  			   NULL);
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(ISDN_DBG,
  	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T4 expire)");
  #endif
  	hfc->l1_activated = false;
  	handle_led(hfc, LED_S0_OFF);
  }
  
  /*****************************/
  /* handle S0 state changes   */
  /*****************************/
  static void
  state_handler(hfcusb_data * hfc, __u8 state)
  {
  	__u8 old_state;
  
  	old_state = hfc->l1_state;
  	if (state == old_state || state < 1 || state > 8)
  		return;
  
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(ISDN_DBG, "HFC-S USB: new S0 state:%d old_state:%d", state,
  	    old_state);
  #endif
  	if (state < 4 || state == 7 || state == 8) {
  		if (timer_pending(&hfc->t3_timer))
  			del_timer(&hfc->t3_timer);
  #ifdef CONFIG_HISAX_DEBUG
  		DBG(ISDN_DBG, "HFC-S USB: T3 deactivated");
  #endif
  	}
  	if (state >= 7) {
  		if (timer_pending(&hfc->t4_timer))
  			del_timer(&hfc->t4_timer);
  #ifdef CONFIG_HISAX_DEBUG
  		DBG(ISDN_DBG, "HFC-S USB: T4 deactivated");
  #endif
  	}
  
  	if (state == 7 && !hfc->l1_activated) {
  		hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
  				   PH_ACTIVATE | INDICATION, NULL);
  #ifdef CONFIG_HISAX_DEBUG
  		DBG(ISDN_DBG, "HFC-S USB: PH_ACTIVATE | INDICATION sent");
  #endif
  		hfc->l1_activated = true;
  		handle_led(hfc, LED_S0_ON);
  	} else if (state <= 3 /* && activated */ ) {
  		if (old_state == 7 || old_state == 8) {
  #ifdef CONFIG_HISAX_DEBUG
  			DBG(ISDN_DBG, "HFC-S USB: T4 activated");
  #endif
  			if (!timer_pending(&hfc->t4_timer)) {
  				hfc->t4_timer.expires =
  				    jiffies + (HFC_TIMER_T4 * HZ) / 1000;
  				add_timer(&hfc->t4_timer);
  			}
  		} else {
  			hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
  					   PH_DEACTIVATE | INDICATION,
  					   NULL);
  #ifdef CONFIG_HISAX_DEBUG
  			DBG(ISDN_DBG,
  			    "HFC-S USB: PH_DEACTIVATE | INDICATION sent");
  #endif
  			hfc->l1_activated = false;
  			handle_led(hfc, LED_S0_OFF);
  		}
  	}
  	hfc->l1_state = state;
  }
  
  /* prepare iso urb */
  static void
  fill_isoc_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe,
  	      void *buf, int num_packets, int packet_size, int interval,
  	      usb_complete_t complete, void *context)
  {
  	int k;
  
  	spin_lock_init(&urb->lock);
  	urb->dev = dev;
  	urb->pipe = pipe;
  	urb->complete = complete;
  	urb->number_of_packets = num_packets;
  	urb->transfer_buffer_length = packet_size * num_packets;
  	urb->context = context;
  	urb->transfer_buffer = buf;
  	urb->transfer_flags = URB_ISO_ASAP;
  	urb->actual_length = 0;
  	urb->interval = interval;
  	for (k = 0; k < num_packets; k++) {
  		urb->iso_frame_desc[k].offset = packet_size * k;
  		urb->iso_frame_desc[k].length = packet_size;
  		urb->iso_frame_desc[k].actual_length = 0;
  	}
  }
  
  /* allocs urbs and start isoc transfer with two pending urbs to avoid
     gaps in the transfer chain */
  static int
  start_isoc_chain(usb_fifo * fifo, int num_packets_per_urb,
  		 usb_complete_t complete, int packet_size)
  {
  	int i, k, errcode;
  
  	printk(KERN_INFO "HFC-S USB: starting ISO-chain for Fifo %i\n",
  	       fifo->fifonum);
  
  	/* allocate Memory for Iso out Urbs */
  	for (i = 0; i < 2; i++) {
  		if (!(fifo->iso[i].purb)) {
  			fifo->iso[i].purb =
  			    usb_alloc_urb(num_packets_per_urb, GFP_KERNEL);
  			if (!(fifo->iso[i].purb)) {
  				printk(KERN_INFO
  				       "alloc urb for fifo %i failed!!!",
  				       fifo->fifonum);
  			}
  			fifo->iso[i].owner_fifo = (struct usb_fifo *) fifo;
  
  			/* Init the first iso */
  			if (ISO_BUFFER_SIZE >=
  			    (fifo->usb_packet_maxlen *
  			     num_packets_per_urb)) {
  				fill_isoc_urb(fifo->iso[i].purb,
  					      fifo->hfc->dev, fifo->pipe,
  					      fifo->iso[i].buffer,
  					      num_packets_per_urb,
  					      fifo->usb_packet_maxlen,
  					      fifo->intervall, complete,
  					      &fifo->iso[i]);
  				memset(fifo->iso[i].buffer, 0,
  				       sizeof(fifo->iso[i].buffer));
  				/* defining packet delimeters in fifo->buffer */
  				for (k = 0; k < num_packets_per_urb; k++) {
  					fifo->iso[i].purb->
  					    iso_frame_desc[k].offset =
  					    k * packet_size;
  					fifo->iso[i].purb->
  					    iso_frame_desc[k].length =
  					    packet_size;
  				}
  			} else {
  				printk(KERN_INFO
  				       "HFC-S USB: ISO Buffer size to small!\n");
  			}
  		}
  		fifo->bit_line = BITLINE_INF;
  
  		errcode = usb_submit_urb(fifo->iso[i].purb, GFP_KERNEL);
  		fifo->active = (errcode >= 0) ? 1 : 0;
  		if (errcode < 0) {
  			printk(KERN_INFO "HFC-S USB: %s  URB nr:%d\n",
  			       symbolic(urb_errlist, errcode), i);
  		};
  	}
  	return (fifo->active);
  }
  
  /* stops running iso chain and frees their pending urbs */
  static void
  stop_isoc_chain(usb_fifo * fifo)
  {
  	int i;
  
  	for (i = 0; i < 2; i++) {
  		if (fifo->iso[i].purb) {
  #ifdef CONFIG_HISAX_DEBUG
  			DBG(USB_DBG,
  			    "HFC-S USB: Stopping iso chain for fifo %i.%i",
  			    fifo->fifonum, i);
  #endif
  			usb_unlink_urb(fifo->iso[i].purb);
  			usb_free_urb(fifo->iso[i].purb);
  			fifo->iso[i].purb = NULL;
  		}
  	}
  	if (fifo->urb) {
  		usb_unlink_urb(fifo->urb);
  		usb_free_urb(fifo->urb);
  		fifo->urb = NULL;
  	}
  	fifo->active = 0;
  }
  
  /* defines how much ISO packets are handled in one URB */
  static int iso_packets[8] =
      { ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B,
  	ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D
  };
  
  /*****************************************************/
  /* transmit completion routine for all ISO tx fifos */
  /*****************************************************/
  static void
  tx_iso_complete(struct urb *urb)
  {
  	iso_urb_struct *context_iso_urb = (iso_urb_struct *) urb->context;
  	usb_fifo *fifo = context_iso_urb->owner_fifo;
  	hfcusb_data *hfc = fifo->hfc;
  	int k, tx_offset, num_isoc_packets, sink, len, current_len,
  	    errcode;
  	int frame_complete, transp_mode, fifon, status;
  	__u8 threshbit;
  	__u8 threshtable[8] = { 1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80 };
  
  	fifon = fifo->fifonum;
  	status = urb->status;
  
  	tx_offset = 0;
  
  	if (fifo->active && !status) {
  		transp_mode = 0;
  		if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
  			transp_mode = true;
  
  		/* is FifoFull-threshold set for our channel? */
  		threshbit = threshtable[fifon] & hfc->threshold_mask;
  		num_isoc_packets = iso_packets[fifon];
  
  		/* predict dataflow to avoid fifo overflow */
  		if (fifon >= HFCUSB_D_TX) {
  			sink = (threshbit) ? SINK_DMIN : SINK_DMAX;
  		} else {
  			sink = (threshbit) ? SINK_MIN : SINK_MAX;
  		}
  		fill_isoc_urb(urb, fifo->hfc->dev, fifo->pipe,
  			      context_iso_urb->buffer, num_isoc_packets,
  			      fifo->usb_packet_maxlen, fifo->intervall,
  			      tx_iso_complete, urb->context);
  		memset(context_iso_urb->buffer, 0,
  		       sizeof(context_iso_urb->buffer));
  		frame_complete = false;
  		/* Generate next Iso Packets */
  		for (k = 0; k < num_isoc_packets; ++k) {
  			if (fifo->skbuff) {
  				len = fifo->skbuff->len;
  				/* we lower data margin every msec */
  				fifo->bit_line -= sink;
  				current_len = (0 - fifo->bit_line) / 8;
  				/* maximum 15 byte for every ISO packet makes our life easier */
  				if (current_len > 14)
  					current_len = 14;
  				current_len =
  				    (len <=
  				     current_len) ? len : current_len;
  				/* how much bit do we put on the line? */
  				fifo->bit_line += current_len * 8;
  
  				context_iso_urb->buffer[tx_offset] = 0;
  				if (current_len == len) {
  					if (!transp_mode) {
  						/* here frame completion */
  						context_iso_urb->
  						    buffer[tx_offset] = 1;
  						/* add 2 byte flags and 16bit CRC at end of ISDN frame */
  						fifo->bit_line += 32;
  					}
  					frame_complete = true;
  				}
  
  				memcpy(context_iso_urb->buffer +
  				       tx_offset + 1, fifo->skbuff->data,
  				       current_len);
  				skb_pull(fifo->skbuff, current_len);
  
  				/* define packet delimeters within the URB buffer */
  				urb->iso_frame_desc[k].offset = tx_offset;
  				urb->iso_frame_desc[k].length =
  				    current_len + 1;
  
  				tx_offset += (current_len + 1);
  			} else {
  				urb->iso_frame_desc[k].offset =
  				    tx_offset++;
  
  				urb->iso_frame_desc[k].length = 1;
  				fifo->bit_line -= sink;	/* we lower data margin every msec */
  
  				if (fifo->bit_line < BITLINE_INF) {
  					fifo->bit_line = BITLINE_INF;
  				}
  			}
  
  			if (frame_complete) {
  				fifo->delete_flg = true;
  				fifo->hif->l1l2(fifo->hif,
  						PH_DATA | CONFIRM,
  						(void *) (unsigned long) fifo->skbuff->
  						truesize);
  				if (fifo->skbuff && fifo->delete_flg) {
  					dev_kfree_skb_any(fifo->skbuff);
  					fifo->skbuff = NULL;
  					fifo->delete_flg = false;
  				}
  				frame_complete = false;
  			}
  		}
  		errcode = usb_submit_urb(urb, GFP_ATOMIC);
  		if (errcode < 0) {
  			printk(KERN_INFO
  			       "HFC-S USB: error submitting ISO URB: %d \n",
  			       errcode);
  		}
  	} else {
  		if (status && !hfc->disc_flag) {
  			printk(KERN_INFO
  			       "HFC-S USB: tx_iso_complete : urb->status %s (%i), fifonum=%d\n",
  			       symbolic(urb_errlist, status), status,
  			       fifon);
  		}
  	}
  }				/* tx_iso_complete */
  
  /*****************************************************/
  /* receive completion routine for all ISO tx fifos   */
  /*****************************************************/
  static void
  rx_iso_complete(struct urb *urb)
  {
  	iso_urb_struct *context_iso_urb = (iso_urb_struct *) urb->context;
  	usb_fifo *fifo = context_iso_urb->owner_fifo;
  	hfcusb_data *hfc = fifo->hfc;
  	int k, len, errcode, offset, num_isoc_packets, fifon, maxlen,
  	    status;
  	unsigned int iso_status;
  	__u8 *buf;
  	static __u8 eof[8];
  #ifdef CONFIG_HISAX_DEBUG
  	__u8 i;
  #endif
  
  	fifon = fifo->fifonum;
  	status = urb->status;
  
  	if (urb->status == -EOVERFLOW) {
  #ifdef CONFIG_HISAX_DEBUG
  		DBG(USB_DBG,
  		    "HFC-USB: ignoring USB DATAOVERRUN  for fifo  %i \n",
  		    fifon);
  #endif
  		status = 0;
  	}
  	if (fifo->active && !status) {
  		num_isoc_packets = iso_packets[fifon];
  		maxlen = fifo->usb_packet_maxlen;
  		for (k = 0; k < num_isoc_packets; ++k) {
  			len = urb->iso_frame_desc[k].actual_length;
  			offset = urb->iso_frame_desc[k].offset;
  			buf = context_iso_urb->buffer + offset;
  			iso_status = urb->iso_frame_desc[k].status;
  #ifdef CONFIG_HISAX_DEBUG
  			if (iso_status && !hfc->disc_flag)
  				DBG(USB_DBG,
  				    "HFC-S USB: ISO packet failure - status:%x",
  				    iso_status);
  
  			if ((fifon == 5) && (debug > 1)) {
  				printk(KERN_INFO
  				       "HFC-S USB: ISO-D-RX lst_urblen:%2d "
  				       "act_urblen:%2d max-urblen:%2d "
  				       "EOF:0x%0x DATA: ",
  				       fifo->last_urblen, len, maxlen,
  				       eof[5]);
  				for (i = 0; i < len; i++)
  					printk("%.2x ", buf[i]);
  				printk("\n");
  			}
  #endif
  			if (fifo->last_urblen != maxlen) {
  				/* the threshold mask is in the 2nd status byte */
  				hfc->threshold_mask = buf[1];
  				/* care for L1 state only for D-Channel
  				   to avoid overlapped iso completions */
  				if (fifon == 5) {
  					/* the S0 state is in the upper half
  					   of the 1st status byte */
  					state_handler(hfc, buf[0] >> 4);
  				}
  				eof[fifon] = buf[0] & 1;
  				if (len > 2)
  					collect_rx_frame(fifo, buf + 2,
  							 len - 2,
  							 (len <
  							  maxlen) ?
  							 eof[fifon] : 0);
  			} else {
  				collect_rx_frame(fifo, buf, len,
  						 (len <
  						  maxlen) ? eof[fifon] :
  						 0);
  			}
  			fifo->last_urblen = len;
  		}
  
  		fill_isoc_urb(urb, fifo->hfc->dev, fifo->pipe,
  			      context_iso_urb->buffer, num_isoc_packets,
  			      fifo->usb_packet_maxlen, fifo->intervall,
  			      rx_iso_complete, urb->context);
  		errcode = usb_submit_urb(urb, GFP_ATOMIC);
  		if (errcode < 0) {
  			printk(KERN_INFO
  			       "HFC-S USB: error submitting ISO URB: %d \n",
  			       errcode);
  		}
  	} else {
  		if (status && !hfc->disc_flag) {
  			printk(KERN_INFO
  			       "HFC-S USB: rx_iso_complete : "
  			       "urb->status %d, fifonum %d\n",
  			       status, fifon);
  		}
  	}
  }				/* rx_iso_complete */
  
  /*****************************************************/
  /* collect data from interrupt or isochron in        */
  /*****************************************************/
  static void
  collect_rx_frame(usb_fifo * fifo, __u8 * data, int len, int finish)
  {
  	hfcusb_data *hfc = fifo->hfc;
  	int transp_mode, fifon;
  #ifdef CONFIG_HISAX_DEBUG
  	int i;
  #endif
  	fifon = fifo->fifonum;
  	transp_mode = 0;
  	if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
  		transp_mode = true;
  
  	if (!fifo->skbuff) {
  		fifo->skbuff = dev_alloc_skb(fifo->max_size + 3);
  		if (!fifo->skbuff) {
  			printk(KERN_INFO
  			       "HFC-S USB: cannot allocate buffer (dev_alloc_skb) fifo:%d\n",
  			       fifon);
  			return;
  		}
  	}
  	if (len) {
  		if (fifo->skbuff->len + len < fifo->max_size) {
  			memcpy(skb_put(fifo->skbuff, len), data, len);
  		} else {
  #ifdef CONFIG_HISAX_DEBUG
  			printk(KERN_INFO "HFC-S USB: ");
  			for (i = 0; i < 15; i++)
  				printk("%.2x ",
  				       fifo->skbuff->data[fifo->skbuff->
  							  len - 15 + i]);
  			printk("\n");
  #endif
  			printk(KERN_INFO
  			       "HCF-USB: got frame exceeded fifo->max_size:%d on fifo:%d\n",
  			       fifo->max_size, fifon);
  		}
  	}
  	if (transp_mode && fifo->skbuff->len >= 128) {
  		fifo->hif->l1l2(fifo->hif, PH_DATA | INDICATION,
  				fifo->skbuff);
  		fifo->skbuff = NULL;
  		return;
  	}
  	/* we have a complete hdlc packet */
  	if (finish) {
  		if ((!fifo->skbuff->data[fifo->skbuff->len - 1])
  		    && (fifo->skbuff->len > 3)) {
  			/* remove CRC & status */
  			skb_trim(fifo->skbuff, fifo->skbuff->len - 3);
  			if (fifon == HFCUSB_PCM_RX) {
  				fifo->hif->l1l2(fifo->hif,
  						PH_DATA_E | INDICATION,
  						fifo->skbuff);
  			} else
  				fifo->hif->l1l2(fifo->hif,
  						PH_DATA | INDICATION,
  						fifo->skbuff);
  			fifo->skbuff = NULL;	/* buffer was freed from upper layer */
  		} else {
  			if (fifo->skbuff->len > 3) {
  				printk(KERN_INFO
  				       "HFC-S USB: got frame %d bytes but CRC ERROR on fifo:%d!!!\n",
  				       fifo->skbuff->len, fifon);
  #ifdef CONFIG_HISAX_DEBUG
  				if (debug > 1) {
  					printk(KERN_INFO "HFC-S USB: ");
  					for (i = 0; i < 15; i++)
  						printk("%.2x ",
  						       fifo->skbuff->
  						       data[fifo->skbuff->
  							    len - 15 + i]);
  					printk("\n");
  				}
  #endif
  			}
  #ifdef CONFIG_HISAX_DEBUG
  			else {
  				printk(KERN_INFO
  				       "HFC-S USB: frame to small (%d bytes)!!!\n",
  				       fifo->skbuff->len);
  			}
  #endif
  			skb_trim(fifo->skbuff, 0);
  		}
  	}
  }
  
  /***********************************************/
  /* receive completion routine for all rx fifos */
  /***********************************************/
  static void
  rx_complete(struct urb *urb)
  {
  	int len;
  	int status;
  	__u8 *buf, maxlen, fifon;
  	usb_fifo *fifo = (usb_fifo *) urb->context;
  	hfcusb_data *hfc = fifo->hfc;
  	static __u8 eof[8];
  #ifdef CONFIG_HISAX_DEBUG
  	__u8 i;
  #endif
  
  	urb->dev = hfc->dev;	/* security init */
  
  	fifon = fifo->fifonum;
  	if ((!fifo->active) || (urb->status)) {
  #ifdef CONFIG_HISAX_DEBUG
  		DBG(USB_DBG, "HFC-S USB: RX-Fifo %i is going down (%i)",
  		    fifon, urb->status);
  #endif
  		fifo->urb->interval = 0;	/* cancel automatic rescheduling */
  		if (fifo->skbuff) {
  			dev_kfree_skb_any(fifo->skbuff);
  			fifo->skbuff = NULL;
  		}
  		return;
  	}
  	len = urb->actual_length;
  	buf = fifo->buffer;
  	maxlen = fifo->usb_packet_maxlen;
  
  #ifdef CONFIG_HISAX_DEBUG
  	if ((fifon == 5) && (debug > 1)) {
  		printk(KERN_INFO
  		       "HFC-S USB: INT-D-RX lst_urblen:%2d act_urblen:%2d max-urblen:%2d EOF:0x%0x DATA: ",
  		       fifo->last_urblen, len, maxlen, eof[5]);
  		for (i = 0; i < len; i++)
  			printk("%.2x ", buf[i]);
  		printk("\n");
  	}
  #endif
  
  	if (fifo->last_urblen != fifo->usb_packet_maxlen) {
  		/* the threshold mask is in the 2nd status byte */
  		hfc->threshold_mask = buf[1];
  		/* the S0 state is in the upper half of the 1st status byte */
  		state_handler(hfc, buf[0] >> 4);
  		eof[fifon] = buf[0] & 1;
  		/* if we have more than the 2 status bytes -> collect data */
  		if (len > 2)
  			collect_rx_frame(fifo, buf + 2,
  					 urb->actual_length - 2,
  					 (len < maxlen) ? eof[fifon] : 0);
  	} else {
  		collect_rx_frame(fifo, buf, urb->actual_length,
  				 (len < maxlen) ? eof[fifon] : 0);
  	}
  	fifo->last_urblen = urb->actual_length;
  	status = usb_submit_urb(urb, GFP_ATOMIC);
  	if (status) {
  		printk(KERN_INFO
  		       "HFC-S USB: error resubmitting URN at rx_complete...\n");
  	}
  }				/* rx_complete */
  
  /***************************************************/
  /* start the interrupt transfer for the given fifo */
  /***************************************************/
  static void
  start_int_fifo(usb_fifo * fifo)
  {
  	int errcode;
  
  	printk(KERN_INFO "HFC-S USB: starting intr IN fifo:%d\n",
  	       fifo->fifonum);
  
  	if (!fifo->urb) {
  		fifo->urb = usb_alloc_urb(0, GFP_KERNEL);
  		if (!fifo->urb)
  			return;
  	}
  	usb_fill_int_urb(fifo->urb, fifo->hfc->dev, fifo->pipe,
  			 fifo->buffer, fifo->usb_packet_maxlen,
  			 rx_complete, fifo, fifo->intervall);
  	fifo->active = 1;	/* must be marked active */
  	errcode = usb_submit_urb(fifo->urb, GFP_KERNEL);
  	if (errcode) {
  		printk(KERN_INFO
  		       "HFC-S USB: submit URB error(start_int_info): status:%i\n",
  		       errcode);
  		fifo->active = 0;
  		fifo->skbuff = NULL;
  	}
  }				/* start_int_fifo */
  
  /*****************************/
  /* set the B-channel mode    */
  /*****************************/
  static void
  set_hfcmode(hfcusb_data * hfc, int channel, int mode)
  {
  	__u8 val, idx_table[2] = { 0, 2 };
  
  	if (hfc->disc_flag) {
  		return;
  	}
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(ISDN_DBG, "HFC-S USB: setting channel %d to mode %d", channel,
  	    mode);
  #endif
  	hfc->b_mode[channel] = mode;
  
  	/* setup CON_HDLC */
  	val = 0;
  	if (mode != L1_MODE_NULL)
  		val = 8;	/* enable fifo? */
  	if (mode == L1_MODE_TRANS)
  		val |= 2;	/* set transparent bit */
  
  	/* set FIFO to transmit register */
  	queue_control_request(hfc, HFCUSB_FIFO, idx_table[channel], 1);
  	queue_control_request(hfc, HFCUSB_CON_HDLC, val, 1);
  	/* reset fifo */
  	queue_control_request(hfc, HFCUSB_INC_RES_F, 2, 1);
  	/* set FIFO to receive register */
  	queue_control_request(hfc, HFCUSB_FIFO, idx_table[channel] + 1, 1);
  	queue_control_request(hfc, HFCUSB_CON_HDLC, val, 1);
  	/* reset fifo */
  	queue_control_request(hfc, HFCUSB_INC_RES_F, 2, 1);
  
  	val = 0x40;
  	if (hfc->b_mode[0])
  		val |= 1;
  	if (hfc->b_mode[1])
  		val |= 2;
  	queue_control_request(hfc, HFCUSB_SCTRL, val, 1);
  
  	val = 0;
  	if (hfc->b_mode[0])
  		val |= 1;
  	if (hfc->b_mode[1])
  		val |= 2;
  	queue_control_request(hfc, HFCUSB_SCTRL_R, val, 1);
  
  	if (mode == L1_MODE_NULL) {
  		if (channel)
  			handle_led(hfc, LED_B2_OFF);
  		else
  			handle_led(hfc, LED_B1_OFF);
  	} else {
  		if (channel)
  			handle_led(hfc, LED_B2_ON);
  		else
  			handle_led(hfc, LED_B1_ON);
  	}
  }
  
  static void
  hfc_usb_l2l1(struct hisax_if *my_hisax_if, int pr, void *arg)
  {
  	usb_fifo *fifo = my_hisax_if->priv;
  	hfcusb_data *hfc = fifo->hfc;
  
  	switch (pr) {
  		case PH_ACTIVATE | REQUEST:
  			if (fifo->fifonum == HFCUSB_D_TX) {
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(ISDN_DBG,
  				    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_ACTIVATE | REQUEST");
  #endif
  				if (hfc->l1_state != 3
  				    && hfc->l1_state != 7) {
  					hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
  							   PH_DEACTIVATE |
  							   INDICATION,
  							   NULL);
  #ifdef CONFIG_HISAX_DEBUG
  					DBG(ISDN_DBG,
  					    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (not state 3 or 7)");
  #endif
  				} else {
  					if (hfc->l1_state == 7) {	/* l1 already active */
  						hfc->d_if.ifc.l1l2(&hfc->
  								   d_if.
  								   ifc,
  								   PH_ACTIVATE
  								   |
  								   INDICATION,
  								   NULL);
  #ifdef CONFIG_HISAX_DEBUG
  						DBG(ISDN_DBG,
  						    "HFC-S USB: PH_ACTIVATE | INDICATION sent again ;)");
  #endif
  					} else {
  						/* force sending sending INFO1 */
  						queue_control_request(hfc,
  								      HFCUSB_STATES,
  								      0x14,
  								      1);
  						mdelay(1);
  						/* start l1 activation */
  						queue_control_request(hfc,
  								      HFCUSB_STATES,
  								      0x04,
  								      1);
  						if (!timer_pending
  						    (&hfc->t3_timer)) {
  							hfc->t3_timer.
  							    expires =
  							    jiffies +
  							    (HFC_TIMER_T3 *
  							     HZ) / 1000;
  							add_timer(&hfc->
  								  t3_timer);
  						}
  					}
  				}
  			} else {
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(ISDN_DBG,
  				    "HFC_USB: hfc_usb_d_l2l1 Bx-chan: PH_ACTIVATE | REQUEST");
  #endif
  				set_hfcmode(hfc,
  					    (fifo->fifonum ==
  					     HFCUSB_B1_TX) ? 0 : 1,
  					    (long) arg);
  				fifo->hif->l1l2(fifo->hif,
  						PH_ACTIVATE | INDICATION,
  						NULL);
  			}
  			break;
  		case PH_DEACTIVATE | REQUEST:
  			if (fifo->fifonum == HFCUSB_D_TX) {
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(ISDN_DBG,
  				    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_DEACTIVATE | REQUEST");
  #endif
  				printk(KERN_INFO
  				       "HFC-S USB: ISDN TE device should not deativate...\n");
  			} else {
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(ISDN_DBG,
  				    "HFC_USB: hfc_usb_d_l2l1 Bx-chan: PH_DEACTIVATE | REQUEST");
  #endif
  				set_hfcmode(hfc,
  					    (fifo->fifonum ==
  					     HFCUSB_B1_TX) ? 0 : 1,
  					    (int) L1_MODE_NULL);
  				fifo->hif->l1l2(fifo->hif,
  						PH_DEACTIVATE | INDICATION,
  						NULL);
  			}
  			break;
  		case PH_DATA | REQUEST:
  			if (fifo->skbuff && fifo->delete_flg) {
  				dev_kfree_skb_any(fifo->skbuff);
  				fifo->skbuff = NULL;
  				fifo->delete_flg = false;
  			}
  			fifo->skbuff = arg;	/* we have a new buffer */
  			break;
  		default:
  			printk(KERN_INFO
  			       "HFC_USB: hfc_usb_d_l2l1: unkown state : %#x\n",
  			       pr);
  			break;
  	}
  }
  
  /***************************************************************************/
  /* usb_init is called once when a new matching device is detected to setup */
  /* main parameters. It registers the driver at the main hisax module.      */
  /* on success 0 is returned.                                               */
  /***************************************************************************/
  static int
  usb_init(hfcusb_data * hfc)
  {
  	usb_fifo *fifo;
  	int i, err;
  	u_char b;
  	struct hisax_b_if *p_b_if[2];
  
  	/* check the chip id */
  	if (read_usb(hfc, HFCUSB_CHIP_ID, &b) != 1) {
  		printk(KERN_INFO "HFC-USB: cannot read chip id\n");
  		return (1);
  	}
  	if (b != HFCUSB_CHIPID) {
  		printk(KERN_INFO "HFC-S USB: Invalid chip id 0x%02x\n", b);
  		return (1);
  	}
  
  	/* first set the needed config, interface and alternate */
  	err = usb_set_interface(hfc->dev, hfc->if_used, hfc->alt_used);
  
  	/* do Chip reset */
  	write_usb(hfc, HFCUSB_CIRM, 8);
  	/* aux = output, reset off */
  	write_usb(hfc, HFCUSB_CIRM, 0x10);
  
  	/* set USB_SIZE to match the the wMaxPacketSize for INT or BULK transfers */
  	write_usb(hfc, HFCUSB_USB_SIZE,
  		  (hfc->packet_size / 8) | ((hfc->packet_size / 8) << 4));
  
  	/* set USB_SIZE_I to match the the wMaxPacketSize for ISO transfers */
  	write_usb(hfc, HFCUSB_USB_SIZE_I, hfc->iso_packet_size);
  
  	/* enable PCM/GCI master mode */
  	write_usb(hfc, HFCUSB_MST_MODE1, 0);	/* set default values */
  	write_usb(hfc, HFCUSB_MST_MODE0, 1);	/* enable master mode */
  
  	/* init the fifos */
  	write_usb(hfc, HFCUSB_F_THRES,
  		  (HFCUSB_TX_THRESHOLD /
  		   8) | ((HFCUSB_RX_THRESHOLD / 8) << 4));
  
  	fifo = hfc->fifos;
  	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
  		write_usb(hfc, HFCUSB_FIFO, i);	/* select the desired fifo */
  		fifo[i].skbuff = NULL;	/* init buffer pointer */
  		fifo[i].max_size =
  		    (i <= HFCUSB_B2_RX) ? MAX_BCH_SIZE : MAX_DFRAME_LEN;
  		fifo[i].last_urblen = 0;
  		/* set 2 bit for D- & E-channel */
  		write_usb(hfc, HFCUSB_HDLC_PAR,
  			  ((i <= HFCUSB_B2_RX) ? 0 : 2));
  		/* rx hdlc, enable IFF for D-channel */
  		write_usb(hfc, HFCUSB_CON_HDLC,
  			  ((i == HFCUSB_D_TX) ? 0x09 : 0x08));
  		write_usb(hfc, HFCUSB_INC_RES_F, 2);	/* reset the fifo */
  	}
  
  	write_usb(hfc, HFCUSB_CLKDEL, 0x0f);	/* clock delay value */
  	write_usb(hfc, HFCUSB_STATES, 3 | 0x10);	/* set deactivated mode */
  	write_usb(hfc, HFCUSB_STATES, 3);	/* enable state machine */
  
  	write_usb(hfc, HFCUSB_SCTRL_R, 0);	/* disable both B receivers */
  	write_usb(hfc, HFCUSB_SCTRL, 0x40);	/* disable B transmitters + capacitive mode */
  
  	/* set both B-channel to not connected */
  	hfc->b_mode[0] = L1_MODE_NULL;
  	hfc->b_mode[1] = L1_MODE_NULL;
  
  	hfc->l1_activated = false;
  	hfc->disc_flag = false;
  	hfc->led_state = 0;
  	hfc->led_new_data = 0;
  	hfc->old_led_state = 0;
  
  	/* init the t3 timer */
  	init_timer(&hfc->t3_timer);
  	hfc->t3_timer.data = (long) hfc;
  	hfc->t3_timer.function = (void *) l1_timer_expire_t3;
  
  	/* init the t4 timer */
  	init_timer(&hfc->t4_timer);
  	hfc->t4_timer.data = (long) hfc;
  	hfc->t4_timer.function = (void *) l1_timer_expire_t4;
  
  	/* init the background machinery for control requests */
  	hfc->ctrl_read.bRequestType = 0xc0;
  	hfc->ctrl_read.bRequest = 1;
  	hfc->ctrl_read.wLength = cpu_to_le16(1);
  	hfc->ctrl_write.bRequestType = 0x40;
  	hfc->ctrl_write.bRequest = 0;
  	hfc->ctrl_write.wLength = 0;
  	usb_fill_control_urb(hfc->ctrl_urb,
  			     hfc->dev,
  			     hfc->ctrl_out_pipe,
  			     (u_char *) & hfc->ctrl_write,
  			     NULL, 0, ctrl_complete, hfc);
  	/* Init All Fifos */
  	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
  		hfc->fifos[i].iso[0].purb = NULL;
  		hfc->fifos[i].iso[1].purb = NULL;
  		hfc->fifos[i].active = 0;
  	}
  	/* register Modul to upper Hisax Layers */
  	hfc->d_if.owner = THIS_MODULE;
  	hfc->d_if.ifc.priv = &hfc->fifos[HFCUSB_D_TX];
  	hfc->d_if.ifc.l2l1 = hfc_usb_l2l1;
  	for (i = 0; i < 2; i++) {
  		hfc->b_if[i].ifc.priv = &hfc->fifos[HFCUSB_B1_TX + i * 2];
  		hfc->b_if[i].ifc.l2l1 = hfc_usb_l2l1;
  		p_b_if[i] = &hfc->b_if[i];
  	}
  	/* default Prot: EURO ISDN, should be a module_param */
  	hfc->protocol = 2;
  	hisax_register(&hfc->d_if, p_b_if, "hfc_usb", hfc->protocol);
  
  #ifdef CONFIG_HISAX_DEBUG
  	hfc_debug = debug;
  #endif
  
  	for (i = 0; i < 4; i++)
  		hfc->fifos[i].hif = &p_b_if[i / 2]->ifc;
  	for (i = 4; i < 8; i++)
  		hfc->fifos[i].hif = &hfc->d_if.ifc;
  
  	/* 3 (+1) INT IN + 3 ISO OUT */
  	if (hfc->cfg_used == CNF_3INT3ISO || hfc->cfg_used == CNF_4INT3ISO) {
  		start_int_fifo(hfc->fifos + HFCUSB_D_RX);
  		if (hfc->fifos[HFCUSB_PCM_RX].pipe)
  			start_int_fifo(hfc->fifos + HFCUSB_PCM_RX);
  		start_int_fifo(hfc->fifos + HFCUSB_B1_RX);
  		start_int_fifo(hfc->fifos + HFCUSB_B2_RX);
  	}
  	/* 3 (+1) ISO IN + 3 ISO OUT */
  	if (hfc->cfg_used == CNF_3ISO3ISO || hfc->cfg_used == CNF_4ISO3ISO) {
  		start_isoc_chain(hfc->fifos + HFCUSB_D_RX, ISOC_PACKETS_D,
  				 rx_iso_complete, 16);
  		if (hfc->fifos[HFCUSB_PCM_RX].pipe)
  			start_isoc_chain(hfc->fifos + HFCUSB_PCM_RX,
  					 ISOC_PACKETS_D, rx_iso_complete,
  					 16);
  		start_isoc_chain(hfc->fifos + HFCUSB_B1_RX, ISOC_PACKETS_B,
  				 rx_iso_complete, 16);
  		start_isoc_chain(hfc->fifos + HFCUSB_B2_RX, ISOC_PACKETS_B,
  				 rx_iso_complete, 16);
  	}
  
  	start_isoc_chain(hfc->fifos + HFCUSB_D_TX, ISOC_PACKETS_D,
  			 tx_iso_complete, 1);
  	start_isoc_chain(hfc->fifos + HFCUSB_B1_TX, ISOC_PACKETS_B,
  			 tx_iso_complete, 1);
  	start_isoc_chain(hfc->fifos + HFCUSB_B2_TX, ISOC_PACKETS_B,
  			 tx_iso_complete, 1);
  
  	handle_led(hfc, LED_POWER_ON);
  
  	return (0);
  }				/* usb_init */
  
  /*************************************************/
  /* function called to probe a new plugged device */
  /*************************************************/
  static int
  hfc_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
  {
  	struct usb_device *dev = interface_to_usbdev(intf);
  	hfcusb_data *context;
  	struct usb_host_interface *iface = intf->cur_altsetting;
  	struct usb_host_interface *iface_used = NULL;
  	struct usb_host_endpoint *ep;
  	int ifnum = iface->desc.bInterfaceNumber;
  	int i, idx, alt_idx, probe_alt_setting, vend_idx, cfg_used, *vcf,
  	    attr, cfg_found, cidx, ep_addr;
  	int cmptbl[16], small_match, iso_packet_size, packet_size,
  	    alt_used = 0;
  	hfcsusb_vdata *driver_info;
  
  	vend_idx = 0xffff;
  	for (i = 0; hfcusb_idtab[i].idVendor; i++) {
  		if ((le16_to_cpu(dev->descriptor.idVendor) == hfcusb_idtab[i].idVendor)
  		    && (le16_to_cpu(dev->descriptor.idProduct) == hfcusb_idtab[i].idProduct)) {
  			vend_idx = i;
  			continue;
  		}
  	}
  
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(USB_DBG,
  	    "HFC-USB: probing interface(%d) actalt(%d) minor(%d)\n", ifnum,
  	    iface->desc.bAlternateSetting, intf->minor);
  #endif
  	printk(KERN_INFO
  	       "HFC-S USB: probing interface(%d) actalt(%d) minor(%d)\n",
  	       ifnum, iface->desc.bAlternateSetting, intf->minor);
  
  	if (vend_idx != 0xffff) {
  		/* if vendor and product ID is OK, start probing alternate settings */
  		alt_idx = 0;
  		small_match = 0xffff;
  
  		/* default settings */
  		iso_packet_size = 16;
  		packet_size = 64;
  
  		while (alt_idx < intf->num_altsetting) {
  			iface = intf->altsetting + alt_idx;
  			probe_alt_setting = iface->desc.bAlternateSetting;
  			cfg_used = 0;
  
  			/* check for config EOL element */
  			while (validconf[cfg_used][0]) {
  				cfg_found = true;
  				vcf = validconf[cfg_used];
  				/* first endpoint descriptor */
  				ep = iface->endpoint;
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(USB_DBG,
  				    "HFC-S USB: (if=%d alt=%d cfg_used=%d)\n",
  				    ifnum, probe_alt_setting, cfg_used);
  #endif
  				memcpy(cmptbl, vcf, 16 * sizeof(int));
  
  				/* check for all endpoints in this alternate setting */
  				for (i = 0; i < iface->desc.bNumEndpoints;
  				     i++) {
  					ep_addr =
  					    ep->desc.bEndpointAddress;
  					/* get endpoint base */
  					idx = ((ep_addr & 0x7f) - 1) * 2;
  					if (ep_addr & 0x80)
  						idx++;
  					attr = ep->desc.bmAttributes;
  					if (cmptbl[idx] == EP_NUL) {
  						cfg_found = false;
  					}
  					if (attr == USB_ENDPOINT_XFER_INT
  					    && cmptbl[idx] == EP_INT)
  						cmptbl[idx] = EP_NUL;
  					if (attr == USB_ENDPOINT_XFER_BULK
  					    && cmptbl[idx] == EP_BLK)
  						cmptbl[idx] = EP_NUL;
  					if (attr == USB_ENDPOINT_XFER_ISOC
  					    && cmptbl[idx] == EP_ISO)
  						cmptbl[idx] = EP_NUL;
  
  					/* check if all INT endpoints match minimum interval */
  					if (attr == USB_ENDPOINT_XFER_INT
  					    && ep->desc.bInterval <
  					    vcf[17]) {
  #ifdef CONFIG_HISAX_DEBUG
  						if (cfg_found)
  							DBG(USB_DBG,
  							    "HFC-S USB: Interrupt Endpoint interval < %d found - skipping config",
  							    vcf[17]);
  #endif
  						cfg_found = false;
  					}
  					ep++;
  				}
  				for (i = 0; i < 16; i++) {
  					/* all entries must be EP_NOP or EP_NUL for a valid config */
  					if (cmptbl[i] != EP_NOP
  					    && cmptbl[i] != EP_NUL)
  						cfg_found = false;
  				}
  				if (cfg_found) {
  					if (cfg_used < small_match) {
  						small_match = cfg_used;
  						alt_used =
  						    probe_alt_setting;
  						iface_used = iface;
  					}
  #ifdef CONFIG_HISAX_DEBUG
  					DBG(USB_DBG,
  					    "HFC-USB: small_match=%x %x\n",
  					    small_match, alt_used);
  #endif
  				}
  				cfg_used++;
  			}
  			alt_idx++;
  		}		/* (alt_idx < intf->num_altsetting) */
  
  		/* found a valid USB Ta Endpint config */
  		if (small_match != 0xffff) {
  			iface = iface_used;
  			if (!
  			    (context =
  			     kzalloc(sizeof(hfcusb_data), GFP_KERNEL)))
  				return (-ENOMEM);	/* got no mem */
  
  			ep = iface->endpoint;
  			vcf = validconf[small_match];
  
  			for (i = 0; i < iface->desc.bNumEndpoints; i++) {
  				ep_addr = ep->desc.bEndpointAddress;
  				/* get endpoint base */
  				idx = ((ep_addr & 0x7f) - 1) * 2;
  				if (ep_addr & 0x80)
  					idx++;
  				cidx = idx & 7;
  				attr = ep->desc.bmAttributes;
  
  				/* init Endpoints */
  				if (vcf[idx] != EP_NOP
  				    && vcf[idx] != EP_NUL) {
  					switch (attr) {
  						case USB_ENDPOINT_XFER_INT:
  							context->
  							    fifos[cidx].
  							    pipe =
  							    usb_rcvintpipe
  							    (dev,
  							     ep->desc.
  							     bEndpointAddress);
  							context->
  							    fifos[cidx].
  							    usb_transfer_mode
  							    = USB_INT;
  							packet_size =
  							    le16_to_cpu(ep->desc.wMaxPacketSize);
  							break;
  						case USB_ENDPOINT_XFER_BULK:
  							if (ep_addr & 0x80)
  								context->
  								    fifos
  								    [cidx].
  								    pipe =
  								    usb_rcvbulkpipe
  								    (dev,
  								     ep->
  								     desc.
  								     bEndpointAddress);
  							else
  								context->
  								    fifos
  								    [cidx].
  								    pipe =
  								    usb_sndbulkpipe
  								    (dev,
  								     ep->
  								     desc.
  								     bEndpointAddress);
  							context->
  							    fifos[cidx].
  							    usb_transfer_mode
  							    = USB_BULK;
  							packet_size =
  							    le16_to_cpu(ep->desc.wMaxPacketSize);
  							break;
  						case USB_ENDPOINT_XFER_ISOC:
  							if (ep_addr & 0x80)
  								context->
  								    fifos
  								    [cidx].
  								    pipe =
  								    usb_rcvisocpipe
  								    (dev,
  								     ep->
  								     desc.
  								     bEndpointAddress);
  							else
  								context->
  								    fifos
  								    [cidx].
  								    pipe =
  								    usb_sndisocpipe
  								    (dev,
  								     ep->
  								     desc.
  								     bEndpointAddress);
  							context->
  							    fifos[cidx].
  							    usb_transfer_mode
  							    = USB_ISOC;
  							iso_packet_size =
  							    le16_to_cpu(ep->desc.wMaxPacketSize);
  							break;
  						default:
  							context->
  							    fifos[cidx].
  							    pipe = 0;
  					}	/* switch attribute */
  
  					if (context->fifos[cidx].pipe) {
  						context->fifos[cidx].
  						    fifonum = cidx;
  						context->fifos[cidx].hfc =
  						    context;
  						context->fifos[cidx].usb_packet_maxlen =
  						    le16_to_cpu(ep->desc.wMaxPacketSize);
  						context->fifos[cidx].
  						    intervall =
  						    ep->desc.bInterval;
  						context->fifos[cidx].
  						    skbuff = NULL;
  					}
  				}
  				ep++;
  			}
  			context->dev = dev;	/* save device */
  			context->if_used = ifnum;	/* save used interface */
  			context->alt_used = alt_used;	/* and alternate config */
  			context->ctrl_paksize = dev->descriptor.bMaxPacketSize0;	/* control size */
  			context->cfg_used = vcf[16];	/* store used config */
  			context->vend_idx = vend_idx;	/* store found vendor */
  			context->packet_size = packet_size;
  			context->iso_packet_size = iso_packet_size;
  
  			/* create the control pipes needed for register access */
  			context->ctrl_in_pipe =
  			    usb_rcvctrlpipe(context->dev, 0);
  			context->ctrl_out_pipe =
  			    usb_sndctrlpipe(context->dev, 0);
  			context->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
  
  			driver_info =
  			    (hfcsusb_vdata *) hfcusb_idtab[vend_idx].
  			    driver_info;
  			printk(KERN_INFO "HFC-S USB: detected \"%s\"\n",
  			       driver_info->vend_name);
  #ifdef CONFIG_HISAX_DEBUG
  			DBG(USB_DBG,
  			    "HFC-S USB: Endpoint-Config: %s (if=%d alt=%d)\n",
  			    conf_str[small_match], context->if_used,
  			    context->alt_used);
  			printk(KERN_INFO
  			       "HFC-S USB: E-channel (\"ECHO:\") logging ");
  			if (validconf[small_match][18])
  				printk(" possible\n");
  			else
  				printk("NOT possible\n");
  #endif
  			/* init the chip and register the driver */
  			if (usb_init(context)) {
  				if (context->ctrl_urb) {
  					usb_unlink_urb(context->ctrl_urb);
  					usb_free_urb(context->ctrl_urb);
  					context->ctrl_urb = NULL;
  				}
  				kfree(context);
  				return (-EIO);
  			}
  			usb_set_intfdata(intf, context);
  			return (0);
  		}
  	} else {
  		printk(KERN_INFO
  		       "HFC-S USB: no valid vendor found in USB descriptor\n");
  	}
  	return (-EIO);
  }
  
  /****************************************************/
  /* function called when an active device is removed */
  /****************************************************/
  static void
  hfc_usb_disconnect(struct usb_interface
  		   *intf)
  {
  	hfcusb_data *context = usb_get_intfdata(intf);
  	int i;
  	printk(KERN_INFO "HFC-S USB: device disconnect\n");
  	context->disc_flag = true;
  	usb_set_intfdata(intf, NULL);
  	if (!context)
  		return;
  	if (timer_pending(&context->t3_timer))
  		del_timer(&context->t3_timer);
  	if (timer_pending(&context->t4_timer))
  		del_timer(&context->t4_timer);
  	/* tell all fifos to terminate */
  	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
  		if (context->fifos[i].usb_transfer_mode == USB_ISOC) {
  			if (context->fifos[i].active > 0) {
  				stop_isoc_chain(&context->fifos[i]);
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(USB_DBG,
  				    "HFC-S USB: hfc_usb_disconnect: stopping ISOC chain Fifo no %i",
  				    i);
  #endif
  			}
  		} else {
  			if (context->fifos[i].active > 0) {
  				context->fifos[i].active = 0;
  #ifdef CONFIG_HISAX_DEBUG
  				DBG(USB_DBG,
  				    "HFC-S USB: hfc_usb_disconnect: unlinking URB for Fifo no %i",
  				    i);
  #endif
  			}
  			if (context->fifos[i].urb) {
  				usb_unlink_urb(context->fifos[i].urb);
  				usb_free_urb(context->fifos[i].urb);
  				context->fifos[i].urb = NULL;
  			}
  		}
  		context->fifos[i].active = 0;
  	}
  	/* wait for all URBS to terminate */
  	mdelay(10);
  	if (context->ctrl_urb) {
  		usb_unlink_urb(context->ctrl_urb);
  		usb_free_urb(context->ctrl_urb);
  		context->ctrl_urb = NULL;
  	}
  	hisax_unregister(&context->d_if);
  	kfree(context);		/* free our structure again */
  }				/* hfc_usb_disconnect */
  
  /************************************/
  /* our driver information structure */
  /************************************/
  static struct usb_driver hfc_drv = {
  	.name  = "hfc_usb",
  	.id_table = hfcusb_idtab,
  	.probe = hfc_usb_probe,
  	.disconnect = hfc_usb_disconnect,
  };
  static void __exit
  hfc_usb_exit(void)
  {
  #ifdef CONFIG_HISAX_DEBUG
  	DBG(USB_DBG, "HFC-S USB: calling \"hfc_usb_exit\" ...");
  #endif
  	usb_deregister(&hfc_drv);	/* release our driver */
  	printk(KERN_INFO "HFC-S USB: module removed\n");
  }
  
  static int __init
  hfc_usb_init(void)
  {
  #ifndef CONFIG_HISAX_DEBUG
  	unsigned int debug = -1;
  #endif
  	char revstr[30], datestr[30], dummy[30];
  	sscanf(hfcusb_revision,
  	       "%s %s $ %s %s %s $ ", dummy, revstr,
  	       dummy, datestr, dummy);
  	printk(KERN_INFO
  	       "HFC-S USB: driver module revision %s date %s loaded, (debug=%i)\n",
  	       revstr, datestr, debug);
  	if (usb_register(&hfc_drv)) {
  		printk(KERN_INFO
  		       "HFC-S USB: Unable to register HFC-S USB module at usb stack\n");
  		return (-1);	/* unable to register */
  	}
  	return (0);
  }
  
  module_init(hfc_usb_init);
  module_exit(hfc_usb_exit);
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(usb, hfcusb_idtab);
  