/*
 * 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 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(hfcusb_data *hfc)
{
        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(hfcusb_data *hfc)
{
        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;

        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;

        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 */
        setup_timer(&hfc->t3_timer, (void *)l1_timer_expire_t3, (long)hfc);

        /* init the t4 timer */
        setup_timer(&hfc->t4_timer, (void *)l1_timer_expire_t4, (long)hfc);

        /* 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);