Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1608 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/hfc_usb.c b/drivers/isdn/hisax/hfc_usb.c
new file mode 100644
index 000000000..1d4cd01d4
--- /dev/null
+++ b/drivers/isdn/hisax/hfc_usb.c
@@ -0,0 +1,1608 @@
+/*
+ * hfc_usb.c
+ *
+ * $Id: hfc_usb.c,v 2.3.2.24 2007/10/14 08:40:29 mbachem Exp $
+ *
+ * modular HiSax ISDN driver for Colognechip HFC-S USB chip
+ *
+ * Authors : Peter Sprenger (sprenger@moving-bytes.de)
+ *           Martin Bachem (m.bachem@gmx.de, 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/sched.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include "hisax.h"
+#include "hisax_if.h"
+#include "hfc_usb.h"
+
+static const char *hfcusb_revision =
+	"$Revision: 2.3.2.24 $ $Date: 2007/10/14 08:40:29 $ ";
+
+/* Hisax debug support
+ *  debug flags defined in hfc_usb.h as HFCUSB_DBG_[*]
+ */
+#define __debug_variable hfc_debug
+#include "hisax_debug.h"
+static u_int debug;
+module_param(debug, uint, 0);
+static int hfc_debug;
+
+
+/* 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;
+
+/* VID/PID device list */
+static const 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"}),
+	},
+	{
+		USB_DEVICE(0x071d, 0x1005),
+		.driver_info = (unsigned long) &((hfcsusb_vdata)
+			{LED_SCHEME1, {0x02, 0, 0x01, 0x04},
+					"Eicon DIVA USB 4.0"}),
+	},
+	{ }
+};
+
+/* 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,	/* handles for control pipe */
+		ctrl_out_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;
+
+	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>";
+}
+
+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 */
+
+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);
+}
+
+static void
+ctrl_complete(struct urb *urb)
+{
+	hfcusb_data *hfc = (hfcusb_data *) urb->context;
+
+	urb->dev = hfc->dev;
+	if (hfc->ctrl_cnt) {
+		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 */
+	}
+}
+
+/* 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);
+	}
+}
+
+static void
+set_led_bit(hfcusb_data *hfc, signed short led_bits, int on)
+{
+	if (on) {
+		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], 1);
+		set_led_bit(hfc, driver_info->led_bits[1], 0);
+		set_led_bit(hfc, driver_info->led_bits[2], 0);
+		set_led_bit(hfc, driver_info->led_bits[3], 0);
+		break;
+	case LED_POWER_OFF:
+		set_led_bit(hfc, driver_info->led_bits[0], 0);
+		set_led_bit(hfc, driver_info->led_bits[1], 0);
+		set_led_bit(hfc, driver_info->led_bits[2], 0);
+		set_led_bit(hfc, driver_info->led_bits[3], 0);
+		break;
+	case LED_S0_ON:
+		set_led_bit(hfc, driver_info->led_bits[1], 1);
+		break;
+	case LED_S0_OFF:
+		set_led_bit(hfc, driver_info->led_bits[1], 0);
+		break;
+	case LED_B1_ON:
+		set_led_bit(hfc, driver_info->led_bits[2], 1);
+		break;
+	case LED_B1_OFF:
+		set_led_bit(hfc, driver_info->led_bits[2], 0);
+		break;
+	case LED_B2_ON:
+		set_led_bit(hfc, driver_info->led_bits[3], 1);
+		break;
+	case LED_B2_OFF:
+		set_led_bit(hfc, driver_info->led_bits[3], 0);
+		break;
+	}
+	write_led(hfc, hfc->led_state);
+}
+
+/* ISDN l1 timer T3 expires */
+static void
+l1_timer_expire_t3(struct timer_list *t)
+{
+	hfcusb_data *hfc = from_timer(hfc, t, t3_timer);
+	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
+			   NULL);
+
+	DBG(HFCUSB_DBG_STATES,
+	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T3 expire)");
+
+	hfc->l1_activated = 0;
+	handle_led(hfc, LED_S0_OFF);
+	/* deactivate : */
+	queue_control_request(hfc, HFCUSB_STATES, 0x10, 1);
+	queue_control_request(hfc, HFCUSB_STATES, 3, 1);
+}
+
+/* ISDN l1 timer T4 expires */
+static void
+l1_timer_expire_t4(struct timer_list *t)
+{
+	hfcusb_data *hfc = from_timer(hfc, t, t4_timer);
+	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
+			   NULL);
+
+	DBG(HFCUSB_DBG_STATES,
+	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T4 expire)");
+
+	hfc->l1_activated = 0;
+	handle_led(hfc, LED_S0_OFF);
+}
+
+/* S0 state changed */
+static void
+s0_state_handler(hfcusb_data *hfc, __u8 state)
+{
+	__u8 old_state;
+
+	old_state = hfc->l1_state;
+	if (state == old_state || state < 1 || state > 8)
+		return;
+
+	DBG(HFCUSB_DBG_STATES, "HFC-S USB: S0 statechange(%d -> %d)",
+	    old_state, state);
+
+	if (state < 4 || state == 7 || state == 8) {
+		if (timer_pending(&hfc->t3_timer))
+			del_timer(&hfc->t3_timer);
+		DBG(HFCUSB_DBG_STATES, "HFC-S USB: T3 deactivated");
+	}
+	if (state >= 7) {
+		if (timer_pending(&hfc->t4_timer))
+			del_timer(&hfc->t4_timer);
+		DBG(HFCUSB_DBG_STATES, "HFC-S USB: T4 deactivated");
+	}
+
+	if (state == 7 && !hfc->l1_activated) {
+		hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
+				   PH_ACTIVATE | INDICATION, NULL);
+		DBG(HFCUSB_DBG_STATES, "HFC-S USB: PH_ACTIVATE | INDICATION sent");
+		hfc->l1_activated = 1;
+		handle_led(hfc, LED_S0_ON);
+	} else if (state <= 3 /* && activated */) {
+		if (old_state == 7 || old_state == 8) {
+			DBG(HFCUSB_DBG_STATES, "HFC-S USB: T4 activated");
+			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);
+			DBG(HFCUSB_DBG_STATES,
+			    "HFC-S USB: PH_DEACTIVATE | INDICATION sent");
+			hfc->l1_activated = 0;
+			handle_led(hfc, LED_S0_OFF);
+		}
+	}
+	hfc->l1_state = state;
+}
+
+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;
+
+	usb_fill_int_urb(urb, dev, pipe, buf, packet_size * num_packets,
+			 complete, context, interval);
+
+	urb->number_of_packets = num_packets;
+	urb->transfer_flags = URB_ISO_ASAP;
+	urb->actual_length = 0;
+	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;
+
+	DBG(HFCUSB_DBG_INIT, "HFC-S USB: starting ISO-URBs for fifo:%d\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: usb_submit_urb URB nr:%d, error(%i): '%s'\n",
+			       i, errcode, symbolic(urb_errlist, errcode));
+	}
+	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) {
+			DBG(HFCUSB_DBG_INIT,
+			    "HFC-S USB: Stopping iso chain for fifo %i.%i",
+			    fifo->fifonum, i);
+			usb_kill_urb(fifo->iso[i].purb);
+			usb_free_urb(fifo->iso[i].purb);
+			fifo->iso[i].purb = NULL;
+		}
+	}
+
+	usb_kill_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
+};
+
+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;
+
+	fifon = fifo->fifonum;
+	status = urb->status;
+
+	tx_offset = 0;
+
+	/* ISO transfer only partially completed,
+	   look at individual frame status for details */
+	if (status == -EXDEV) {
+		DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: tx_iso_complete with -EXDEV"
+		    ", urb->status %d, fifonum %d\n",
+		    status, fifon);
+
+		for (k = 0; k < iso_packets[fifon]; ++k) {
+			errcode = urb->iso_frame_desc[k].status;
+			if (errcode)
+				DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: tx_iso_complete "
+				    "packet %i, status: %i\n",
+				    k, errcode);
+		}
+
+		// clear status, so go on with ISO transfers
+		status = 0;
+	}
+
+	if (fifo->active && !status) {
+		transp_mode = 0;
+		if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
+			transp_mode = 1;
+
+		/* is FifoFull-threshold set for our channel? */
+		threshbit = (hfc->threshold_mask & (1 << fifon));
+		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 = 0;
+
+		/* 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 = 1;
+				}
+
+				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 = 1;
+				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 = 0;
+				}
+				frame_complete = 0;
+			}
+		}
+		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: error(%i): '%s', fifonum=%d\n",
+			       status, symbolic(urb_errlist, status), fifon);
+		}
+	}
+}
+
+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];
+
+	fifon = fifo->fifonum;
+	status = urb->status;
+
+	if (urb->status == -EOVERFLOW) {
+		DBG(HFCUSB_DBG_VERBOSE_USB,
+		    "HFC-USB: ignoring USB DATAOVERRUN fifo(%i)", fifon);
+		status = 0;
+	}
+
+	/* ISO transfer only partially completed,
+	   look at individual frame status for details */
+	if (status == -EXDEV) {
+		DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: rx_iso_complete with -EXDEV "
+		    "urb->status %d, fifonum %d\n",
+		    status, fifon);
+		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;
+
+			if (iso_status && !hfc->disc_flag)
+				DBG(HFCUSB_DBG_VERBOSE_USB,
+				    "HFC-S USB: rx_iso_complete "
+				    "ISO packet %i, status: %i\n",
+				    k, iso_status);
+
+			if (fifon == HFCUSB_D_RX) {
+				DBG(HFCUSB_DBG_VERBOSE_USB,
+				    "HFC-S USB: ISO-D-RX lst_urblen:%2d "
+				    "act_urblen:%2d max-urblen:%2d EOF:0x%0x",
+				    fifo->last_urblen, len, maxlen,
+				    eof[5]);
+
+				DBG_PACKET(HFCUSB_DBG_VERBOSE_USB, buf, len);
+			}
+
+			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 == HFCUSB_D_RX) {
+					/* the S0 state is in the upper half
+					   of the 1st status byte */
+					s0_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_ERR
+			       "HFC-S USB: error submitting ISO URB: %d\n",
+			       errcode);
+		}
+	} else {
+		if (status && !hfc->disc_flag) {
+			printk(KERN_ERR
+			       "HFC-S USB: rx_iso_complete : "
+			       "urb->status %d, fifonum %d\n",
+			       status, fifon);
+		}
+	}
+}
+
+/* collect rx data from INT- and ISO-URBs  */
+static void
+collect_rx_frame(usb_fifo *fifo, __u8 *data, int len, int finish)
+{
+	hfcusb_data *hfc = fifo->hfc;
+	int transp_mode, fifon;
+
+	fifon = fifo->fifonum;
+	transp_mode = 0;
+	if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
+		transp_mode = 1;
+
+	if (!fifo->skbuff) {
+		fifo->skbuff = dev_alloc_skb(fifo->max_size + 3);
+		if (!fifo->skbuff) {
+			printk(KERN_ERR
+			       "HFC-S USB: cannot allocate buffer for fifo(%d)\n",
+			       fifon);
+			return;
+		}
+	}
+	if (len) {
+		if (fifo->skbuff->len + len < fifo->max_size) {
+			skb_put_data(fifo->skbuff, data, len);
+		} else {
+			DBG(HFCUSB_DBG_FIFO_ERR,
+			    "HCF-USB: got frame exceeded fifo->max_size(%d) fifo(%d)",
+			    fifo->max_size, fifon);
+			DBG_SKB(HFCUSB_DBG_VERBOSE_USB, fifo->skbuff);
+			skb_trim(fifo->skbuff, 0);
+		}
+	}
+	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->len > 3 &&
+		    !fifo->skbuff->data[fifo->skbuff->len - 1]) {
+
+			if (fifon == HFCUSB_D_RX) {
+				DBG(HFCUSB_DBG_DCHANNEL,
+				    "HFC-S USB: D-RX len(%d)", fifo->skbuff->len);
+				DBG_SKB(HFCUSB_DBG_DCHANNEL, fifo->skbuff);
+			}
+
+			/* 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 {
+			DBG(HFCUSB_DBG_FIFO_ERR,
+			    "HFC-S USB: ERROR frame len(%d) fifo(%d)",
+			    fifo->skbuff->len, fifon);
+			DBG_SKB(HFCUSB_DBG_VERBOSE_USB, fifo->skbuff);
+			skb_trim(fifo->skbuff, 0);
+		}
+	}
+}
+
+static void
+rx_int_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];
+
+	urb->dev = hfc->dev;	/* security init */
+
+	fifon = fifo->fifonum;
+	if ((!fifo->active) || (urb->status)) {
+		DBG(HFCUSB_DBG_INIT, "HFC-S USB: RX-Fifo %i is going down (%i)",
+		    fifon, urb->status);
+
+		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;
+
+	if (fifon == HFCUSB_D_RX) {
+		DBG(HFCUSB_DBG_VERBOSE_USB,
+		    "HFC-S USB: INT-D-RX lst_urblen:%2d "
+		    "act_urblen:%2d max-urblen:%2d EOF:0x%0x",
+		    fifo->last_urblen, len, maxlen,
+		    eof[5]);
+		DBG_PACKET(HFCUSB_DBG_VERBOSE_USB, buf, len);
+	}
+
+	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 */
+		s0_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: %s error resubmitting URB fifo(%d)\n",
+		       __func__, fifon);
+	}
+}
+
+/* start initial INT-URB for certain fifo */
+static void
+start_int_fifo(usb_fifo *fifo)
+{
+	int errcode;
+
+	DBG(HFCUSB_DBG_INIT, "HFC-S USB: starting RX INT-URB for 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_int_complete, fifo, fifo->intervall);
+	fifo->active = 1;	/* must be marked active */
+	errcode = usb_submit_urb(fifo->urb, GFP_KERNEL);
+	if (errcode) {
+		printk(KERN_ERR "HFC-S USB: submit URB error(%s): status:%i\n",
+		       __func__, errcode);
+		fifo->active = 0;
+		fifo->skbuff = NULL;
+	}
+}
+
+static void
+setup_bchannel(hfcusb_data *hfc, int channel, int mode)
+{
+	__u8 val, idx_table[2] = { 0, 2 };
+
+	if (hfc->disc_flag) {
+		return;
+	}
+	DBG(HFCUSB_DBG_STATES, "HFC-S USB: setting channel %d to mode %d",
+	    channel, mode);
+	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) {
+			DBG(HFCUSB_DBG_STATES,
+			    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_ACTIVATE | REQUEST");
+
+			if (hfc->l1_state != 3
+			    && hfc->l1_state != 7) {
+				hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
+						   PH_DEACTIVATE |
+						   INDICATION,
+						   NULL);
+				DBG(HFCUSB_DBG_STATES,
+				    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (not state 3 or 7)");
+			} else {
+				if (hfc->l1_state == 7) {	/* l1 already active */
+					hfc->d_if.ifc.l1l2(&hfc->
+							   d_if.
+							   ifc,
+							   PH_ACTIVATE
+							   |
+							   INDICATION,
+							   NULL);
+					DBG(HFCUSB_DBG_STATES,
+					    "HFC-S USB: PH_ACTIVATE | INDICATION sent again ;)");
+				} 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 {
+			DBG(HFCUSB_DBG_STATES,
+			    "HFC_USB: hfc_usb_d_l2l1 B-chan: PH_ACTIVATE | REQUEST");
+			setup_bchannel(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) {
+			DBG(HFCUSB_DBG_STATES,
+			    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_DEACTIVATE | REQUEST");
+		} else {
+			DBG(HFCUSB_DBG_STATES,
+			    "HFC_USB: hfc_usb_d_l2l1 Bx-chan: PH_DEACTIVATE | REQUEST");
+			setup_bchannel(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 = 0;
+		}
+		fifo->skbuff = arg;	/* we have a new buffer */
+		break;
+	default:
+		DBG(HFCUSB_DBG_STATES,
+		    "HFC_USB: hfc_usb_d_l2l1: unknown state : %#x", pr);
+		break;
+	}
+}
+
+/* initial init HFC-S USB chip registers, HiSax interface, USB URBs */
+static int
+hfc_usb_init(hfcusb_data *hfc)
+{
+	usb_fifo *fifo;
+	int i;
+	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 */
+	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 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 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 = 0;
+	hfc->disc_flag = 0;
+	hfc->led_state = 0;
+	hfc->old_led_state = 0;
+
+	/* init the t3 timer */
+	timer_setup(&hfc->t3_timer, l1_timer_expire_t3, 0);
+
+	/* init the t4 timer */
+	timer_setup(&hfc->t4_timer, l1_timer_expire_t4, 0);
+
+	/* 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;
+	i = hisax_register(&hfc->d_if, p_b_if, "hfc_usb", hfc->protocol);
+	if (i) {
+		printk(KERN_INFO "HFC-S USB: hisax_register -> %d\n", i);
+		return i;
+	}
+
+#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);
+}
+
+/* initial callback for each plugged USB 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;
+		}
+	}
+
+	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 = 1;
+				vcf = validconf[cfg_used];
+				/* first endpoint descriptor */
+				ep = iface->endpoint;
+
+				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 = 0;
+					}
+					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])) {
+						cfg_found = 0;
+					}
+					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 = 0;
+				}
+				if (cfg_found) {
+					if (cfg_used < small_match) {
+						small_match = cfg_used;
+						alt_used =
+							probe_alt_setting;
+						iface_used = iface;
+					}
+				}
+				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);
+
+			driver_info = (hfcsusb_vdata *)
+				      hfcusb_idtab[vend_idx].driver_info;
+
+			context->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
+
+			if (!context->ctrl_urb) {
+				pr_warn("%s: No memory for control urb\n",
+					driver_info->vend_name);
+				kfree(context);
+				return -ENOMEM;
+			}
+
+			pr_info("HFC-S USB: detected \"%s\"\n",
+				driver_info->vend_name);
+
+			DBG(HFCUSB_DBG_INIT,
+			    "HFC-S USB: Endpoint-Config: %s (if=%d alt=%d), E-Channel(%d)",
+			    conf_str[small_match], context->if_used,
+			    context->alt_used,
+			    validconf[small_match][18]);
+
+			/* init the chip and register the driver */
+			if (hfc_usb_init(context)) {
+				usb_kill_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);
+}
+
+/* callback for unplugged USB device */
+static void
+hfc_usb_disconnect(struct usb_interface *intf)
+{
+	hfcusb_data *context = usb_get_intfdata(intf);
+	int i;
+
+	handle_led(context, LED_POWER_OFF);
+	schedule_timeout(HZ / 100);
+
+	printk(KERN_INFO "HFC-S USB: device disconnect\n");
+	context->disc_flag = 1;
+	usb_set_intfdata(intf, NULL);
+
+	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]);
+				DBG(HFCUSB_DBG_INIT,
+				    "HFC-S USB: %s stopping ISOC chain Fifo(%i)",
+				    __func__, i);
+			}
+		} else {
+			if (context->fifos[i].active > 0) {
+				context->fifos[i].active = 0;
+				DBG(HFCUSB_DBG_INIT,
+				    "HFC-S USB: %s unlinking URB for Fifo(%i)",
+				    __func__, i);
+			}
+			usb_kill_urb(context->fifos[i].urb);
+			usb_free_urb(context->fifos[i].urb);
+			context->fifos[i].urb = NULL;
+		}
+		context->fifos[i].active = 0;
+	}
+	usb_kill_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 */
+}
+
+static struct usb_driver hfc_drv = {
+	.name  = "hfc_usb",
+	.id_table = hfcusb_idtab,
+	.probe = hfc_usb_probe,
+	.disconnect = hfc_usb_disconnect,
+	.disable_hub_initiated_lpm = 1,
+};
+
+static void __exit
+hfc_usb_mod_exit(void)
+{
+	usb_deregister(&hfc_drv); /* release our driver */
+	printk(KERN_INFO "HFC-S USB: module removed\n");
+}
+
+static int __init
+hfc_usb_mod_init(void)
+{
+	char revstr[30], datestr[30], dummy[30];
+#ifndef CONFIG_HISAX_DEBUG
+	hfc_debug = debug;
+#endif
+	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_mod_init);
+module_exit(hfc_usb_mod_exit);
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, hfcusb_idtab);