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isdnloop.c

/* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
 *
 * ISDN low-level module implementing a dummy loop driver.
 *
 * Copyright 1997 by Fritz Elfert (fritz@isdn4linux.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/sched.h>
#include "isdnloop.h"

static char *revision = "$Revision: 1.11.6.7 $";
static char *isdnloop_id = "loop0";

MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
MODULE_AUTHOR("Fritz Elfert");
MODULE_LICENSE("GPL");
module_param(isdnloop_id, charp, 0);
MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");

static int isdnloop_addcard(char *);

/*
 * Free queue completely.
 *
 * Parameter:
 *   card    = pointer to card struct
 *   channel = channel number
 */
static void
isdnloop_free_queue(isdnloop_card * card, int channel)
{
      struct sk_buff_head *queue = &card->bqueue[channel];

      skb_queue_purge(queue);
      card->sndcount[channel] = 0;
}

/*
 * Send B-Channel data to another virtual card.
 * This routine is called via timer-callback from isdnloop_pollbchan().
 *
 * Parameter:
 *   card = pointer to card struct.
 *   ch   = channel number (0-based)
 */
static void
isdnloop_bchan_send(isdnloop_card * card, int ch)
{
      isdnloop_card *rcard = card->rcard[ch];
      int rch = card->rch[ch], len, ack;
      struct sk_buff *skb;
      isdn_ctrl cmd;

      while (card->sndcount[ch]) {
            if ((skb = skb_dequeue(&card->bqueue[ch]))) {
                  len = skb->len;
                  card->sndcount[ch] -= len;
                  ack = *(skb->head); /* used as scratch area */
                  cmd.driver = card->myid;
                  cmd.arg = ch;
                  if (rcard){
                        rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
                  } else {
                        printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
                        dev_kfree_skb(skb);

                  };
                  cmd.command = ISDN_STAT_BSENT;
                  cmd.parm.length = len;
                  card->interface.statcallb(&cmd);
            } else
                  card->sndcount[ch] = 0;
      }
}

/*
 * Send/Receive Data to/from the B-Channel.
 * This routine is called via timer-callback.
 * It schedules itself while any B-Channel is open.
 *
 * Parameter:
 *   data = pointer to card struct, set by kernel timer.data
 */
static void
isdnloop_pollbchan(unsigned long data)
{
      isdnloop_card *card = (isdnloop_card *) data;
      unsigned long flags;

      if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
            isdnloop_bchan_send(card, 0);
      if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
            isdnloop_bchan_send(card, 1);
      if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
            /* schedule b-channel polling again */
            spin_lock_irqsave(&card->isdnloop_lock, flags);
            card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
            add_timer(&card->rb_timer);
            card->flags |= ISDNLOOP_FLAGS_RBTIMER;
            spin_unlock_irqrestore(&card->isdnloop_lock, flags);
      } else
            card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
}

/*
 * Parse ICN-type setup string and fill fields of setup-struct
 * with parsed data.
 *
 * Parameter:
 *   setup = setup string, format: [caller-id],si1,si2,[called-id]
 *   cmd   = pointer to struct to be filled.
 */
static void
isdnloop_parse_setup(char *setup, isdn_ctrl * cmd)
{
      char *t = setup;
      char *s = strchr(t, ',');

      *s++ = '\0';
      strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
      s = strchr(t = s, ',');
      *s++ = '\0';
      if (!strlen(t))
            cmd->parm.setup.si1 = 0;
      else
            cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
      s = strchr(t = s, ',');
      *s++ = '\0';
      if (!strlen(t))
            cmd->parm.setup.si2 = 0;
      else
            cmd->parm.setup.si2 =
                simple_strtoul(t, NULL, 10);
      strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
      cmd->parm.setup.plan = 0;
      cmd->parm.setup.screen = 0;
}

typedef struct isdnloop_stat {
      char *statstr;
      int command;
      int action;
} isdnloop_stat;
/* *INDENT-OFF* */
static isdnloop_stat isdnloop_stat_table[] =
{
      {"BCON_",          ISDN_STAT_BCONN, 1}, /* B-Channel connected        */
      {"BDIS_",          ISDN_STAT_BHUP,  2}, /* B-Channel disconnected     */
      {"DCON_",          ISDN_STAT_DCONN, 0}, /* D-Channel connected        */
      {"DDIS_",          ISDN_STAT_DHUP,  0}, /* D-Channel disconnected     */
      {"DCAL_I",         ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line  */
      {"DSCA_I",         ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV     */
      {"FCALL",          ISDN_STAT_ICALL, 4}, /* Leased line connection up  */
      {"CIF",            ISDN_STAT_CINF,  5}, /* Charge-info, 1TR6-type     */
      {"AOC",            ISDN_STAT_CINF,  6}, /* Charge-info, DSS1-type     */
      {"CAU",            ISDN_STAT_CAUSE, 7}, /* Cause code                 */
      {"TEI OK",         ISDN_STAT_RUN,   0}, /* Card connected to wallplug */
      {"E_L1: ACT FAIL", ISDN_STAT_BHUP,  8}, /* Layer-1 activation failed  */
      {"E_L2: DATA LIN", ISDN_STAT_BHUP,  8}, /* Layer-2 data link lost     */
      {"E_L1: ACTIVATION FAILED",
                     ISDN_STAT_BHUP,  8},         /* Layer-1 activation failed  */
      {NULL, 0, -1}
};
/* *INDENT-ON* */


/*
 * Parse Status message-strings from virtual card.
 * Depending on status, call statcallb for sending messages to upper
 * levels. Also set/reset B-Channel active-flags.
 *
 * Parameter:
 *   status  = status string to parse.
 *   channel = channel where message comes from.
 *   card    = card where message comes from.
 */
static void
isdnloop_parse_status(u_char * status, int channel, isdnloop_card * card)
{
      isdnloop_stat *s = isdnloop_stat_table;
      int action = -1;
      isdn_ctrl cmd;

      while (s->statstr) {
            if (!strncmp(status, s->statstr, strlen(s->statstr))) {
                  cmd.command = s->command;
                  action = s->action;
                  break;
            }
            s++;
      }
      if (action == -1)
            return;
      cmd.driver = card->myid;
      cmd.arg = channel;
      switch (action) {
            case 1:
                  /* BCON_x */
                  card->flags |= (channel) ?
                      ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
                  break;
            case 2:
                  /* BDIS_x */
                  card->flags &= ~((channel) ?
                               ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
                  isdnloop_free_queue(card, channel);
                  break;
            case 3:
                  /* DCAL_I and DSCA_I */
                  isdnloop_parse_setup(status + 6, &cmd);
                  break;
            case 4:
                  /* FCALL */
                  sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
                  sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
                  cmd.parm.setup.si1 = 7;
                  cmd.parm.setup.si2 = 0;
                  cmd.parm.setup.plan = 0;
                  cmd.parm.setup.screen = 0;
                  break;
            case 5:
                  /* CIF */
                  strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
                  break;
            case 6:
                  /* AOC */
                  snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
                       (int) simple_strtoul(status + 7, NULL, 16));
                  break;
            case 7:
                  /* CAU */
                  status += 3;
                  if (strlen(status) == 4)
                        snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
                             status + 2, *status, *(status + 1));
                  else
                        strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
                  break;
            case 8:
                  /* Misc Errors on L1 and L2 */
                  card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
                  isdnloop_free_queue(card, 0);
                  cmd.arg = 0;
                  cmd.driver = card->myid;
                  card->interface.statcallb(&cmd);
                  cmd.command = ISDN_STAT_DHUP;
                  cmd.arg = 0;
                  cmd.driver = card->myid;
                  card->interface.statcallb(&cmd);
                  cmd.command = ISDN_STAT_BHUP;
                  card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
                  isdnloop_free_queue(card, 1);
                  cmd.arg = 1;
                  cmd.driver = card->myid;
                  card->interface.statcallb(&cmd);
                  cmd.command = ISDN_STAT_DHUP;
                  cmd.arg = 1;
                  cmd.driver = card->myid;
                  break;
      }
      card->interface.statcallb(&cmd);
}

/*
 * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
 *
 * Parameter:
 *   card = pointer to card struct.
 *   c    = char to store.
 */
static void
isdnloop_putmsg(isdnloop_card * card, unsigned char c)
{
      ulong flags;

      spin_lock_irqsave(&card->isdnloop_lock, flags);
      *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
      if (card->msg_buf_write == card->msg_buf_read) {
            if (++card->msg_buf_read > card->msg_buf_end)
                  card->msg_buf_read = card->msg_buf;
      }
      if (card->msg_buf_write > card->msg_buf_end)
            card->msg_buf_write = card->msg_buf;
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

/*
 * Poll a virtual cards message queue.
 * If there are new status-replies from the card, copy them to
 * ringbuffer for reading on /dev/isdnctrl and call
 * isdnloop_parse_status() for processing them. Watch for special
 * Firmware bootmessage and parse it, to get the D-Channel protocol.
 * If there are B-Channels open, initiate a timer-callback to
 * isdnloop_pollbchan().
 * This routine is called periodically via timer interrupt.
 *
 * Parameter:
 *   data = pointer to card struct
 */
static void
isdnloop_polldchan(unsigned long data)
{
      isdnloop_card *card = (isdnloop_card *) data;
      struct sk_buff *skb;
      int avail;
      int left;
      u_char c;
      int ch;
      unsigned long flags;
      u_char *p;
      isdn_ctrl cmd;

      if ((skb = skb_dequeue(&card->dqueue)))
            avail = skb->len;
      else
            avail = 0;
      for (left = avail; left > 0; left--) {
            c = *skb->data;
            skb_pull(skb, 1);
            isdnloop_putmsg(card, c);
            card->imsg[card->iptr] = c;
            if (card->iptr < 59)
                  card->iptr++;
            if (!skb->len) {
                  avail++;
                  isdnloop_putmsg(card, '\n');
                  card->imsg[card->iptr] = 0;
                  card->iptr = 0;
                  if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
                    card->imsg[1] <= '2' && card->imsg[2] == ';') {
                        ch = (card->imsg[1] - '0') - 1;
                        p = &card->imsg[3];
                        isdnloop_parse_status(p, ch, card);
                  } else {
                        p = card->imsg;
                        if (!strncmp(p, "DRV1.", 5)) {
                              printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
                              if (!strncmp(p + 7, "TC", 2)) {
                                    card->ptype = ISDN_PTYPE_1TR6;
                                    card->interface.features |= ISDN_FEATURE_P_1TR6;
                                    printk(KERN_INFO
                                           "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
                              }
                              if (!strncmp(p + 7, "EC", 2)) {
                                    card->ptype = ISDN_PTYPE_EURO;
                                    card->interface.features |= ISDN_FEATURE_P_EURO;
                                    printk(KERN_INFO
                                           "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
                              }
                              continue;

                        }
                  }
            }
      }
      if (avail) {
            cmd.command = ISDN_STAT_STAVAIL;
            cmd.driver = card->myid;
            cmd.arg = avail;
            card->interface.statcallb(&cmd);
      }
      if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
            if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
                  /* schedule b-channel polling */
                  card->flags |= ISDNLOOP_FLAGS_RBTIMER;
                  spin_lock_irqsave(&card->isdnloop_lock, flags);
                  del_timer(&card->rb_timer);
                  card->rb_timer.function = isdnloop_pollbchan;
                  card->rb_timer.data = (unsigned long) card;
                  card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
                  add_timer(&card->rb_timer);
                  spin_unlock_irqrestore(&card->isdnloop_lock, flags);
            }
      /* schedule again */
      spin_lock_irqsave(&card->isdnloop_lock, flags);
      card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
      add_timer(&card->st_timer);
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

/*
 * Append a packet to the transmit buffer-queue.
 *
 * Parameter:
 *   channel = Number of B-channel
 *   skb     = packet to send.
 *   card    = pointer to card-struct
 * Return:
 *   Number of bytes transferred, -E??? on error
 */
static int
isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card * card)
{
      int len = skb->len;
      unsigned long flags;
      struct sk_buff *nskb;

      if (len > 4000) {
            printk(KERN_WARNING
                   "isdnloop: Send packet too large\n");
            return -EINVAL;
      }
      if (len) {
            if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
                  return 0;
            if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
                  return 0;
            spin_lock_irqsave(&card->isdnloop_lock, flags);
            nskb = dev_alloc_skb(skb->len);
            if (nskb) {
                  skb_copy_from_linear_data(skb,
                                      skb_put(nskb, len), len);
                  skb_queue_tail(&card->bqueue[channel], nskb);
                  dev_kfree_skb(skb);
            } else
                  len = 0;
            card->sndcount[channel] += len;
            spin_unlock_irqrestore(&card->isdnloop_lock, flags);
      }
      return len;
}

/*
 * Read the messages from the card's ringbuffer
 *
 * Parameter:
 *   buf  = pointer to buffer.
 *   len  = number of bytes to read.
 *   user = flag, 1: called from userlevel 0: called from kernel.
 *   card = pointer to card struct.
 * Return:
 *   number of bytes actually transferred.
 */
static int
isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
{
      int count;
      u_char __user *p;

      for (p = buf, count = 0; count < len; p++, count++) {
            if (card->msg_buf_read == card->msg_buf_write)
                  return count;
            if (put_user(*card->msg_buf_read++, p))
                  return -EFAULT;
            if (card->msg_buf_read > card->msg_buf_end)
                  card->msg_buf_read = card->msg_buf;
      }
      return count;
}

/*
 * Simulate a card's response by appending it to the cards
 * message queue.
 *
 * Parameter:
 *   card = pointer to card struct.
 *   s    = pointer to message-string.
 *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
 * Return:
 *   0 on success, 1 on memory squeeze.
 */
static int
isdnloop_fake(isdnloop_card * card, char *s, int ch)
{
      struct sk_buff *skb;
      int len = strlen(s) + ((ch >= 0) ? 3 : 0);

      if (!(skb = dev_alloc_skb(len))) {
            printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
            return 1;
      }
      if (ch >= 0)
            sprintf(skb_put(skb, 3), "%02d;", ch);
      memcpy(skb_put(skb, strlen(s)), s, strlen(s));
      skb_queue_tail(&card->dqueue, skb);
      return 0;
}
/* *INDENT-OFF* */
static isdnloop_stat isdnloop_cmd_table[] =
{
      {"BCON_R",         0,  1},    /* B-Channel connect        */
      {"BCON_I",         0, 17},    /* B-Channel connect ind    */
      {"BDIS_R",         0,  2},    /* B-Channel disconnect     */
      {"DDIS_R",         0,  3},    /* D-Channel disconnect     */
      {"DCON_R",         0, 16},    /* D-Channel connect        */
      {"DSCA_R",         0,  4},    /* Dial 1TR6-SPV     */
      {"DCAL_R",         0,  5},    /* Dial */
      {"EAZC",           0,  6},    /* Clear EAZ listener */
      {"EAZ",            0,  7},    /* Set EAZ listener */
      {"SEEAZ",          0,  8},    /* Get EAZ listener */
      {"MSN",            0,  9},    /* Set/Clear MSN listener */
      {"MSALL",          0, 10},    /* Set multi MSN listeners */
      {"SETSIL",         0, 11},    /* Set SI list     */
      {"SEESIL",         0, 12},    /* Get SI list     */
      {"SILC",           0, 13},    /* Clear SI list     */
      {"LOCK",           0, -1},    /* LOCK channel     */
      {"UNLOCK",         0, -1},    /* UNLOCK channel     */
      {"FV2ON",          1, 14},    /* Leased mode on               */
      {"FV2OFF",         1, 15},    /* Leased mode off              */
      {NULL, 0, -1}
};
/* *INDENT-ON* */


/*
 * Simulate an error-response from a card.
 *
 * Parameter:
 *   card = pointer to card struct.
 */
static void
isdnloop_fake_err(isdnloop_card * card)
{
      char buf[60];

      sprintf(buf, "E%s", card->omsg);
      isdnloop_fake(card, buf, -1);
      isdnloop_fake(card, "NAK", -1);
}

static u_char ctable_eu[] =
{0x00, 0x11, 0x01, 0x12};
static u_char ctable_1t[] =
{0x00, 0x3b, 0x01, 0x3a};

/*
 * Assemble a simplified cause message depending on the
 * D-channel protocol used.
 *
 * Parameter:
 *   card = pointer to card struct.
 *   loc  = location: 0 = local, 1 = remote.
 *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
 * Return:
 *   Pointer to buffer containing the assembled message.
 */
static char *
isdnloop_unicause(isdnloop_card * card, int loc, int cau)
{
      static char buf[6];

      switch (card->ptype) {
            case ISDN_PTYPE_EURO:
                  sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
                  break;
            case ISDN_PTYPE_1TR6:
                  sprintf(buf, "%02X44", ctable_1t[cau]);
                  break;
            default:
                  return ("0000");
      }
      return (buf);
}

/*
 * Release a virtual connection. Called from timer interrupt, when
 * called party did not respond.
 *
 * Parameter:
 *   card = pointer to card struct.
 *   ch   = channel (0-based)
 */
static void
isdnloop_atimeout(isdnloop_card * card, int ch)
{
      unsigned long flags;
      char buf[60];

      spin_lock_irqsave(&card->isdnloop_lock, flags);
      if (card->rcard) {
            isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
            card->rcard[ch]->rcard[card->rch[ch]] = NULL;
            card->rcard[ch] = NULL;
      }
      isdnloop_fake(card, "DDIS_I", ch + 1);
      /* No user responding */
      sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
      isdnloop_fake(card, buf, ch + 1);
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

/*
 * Wrapper for isdnloop_atimeout().
 */
static void
isdnloop_atimeout0(unsigned long data)
{
      isdnloop_card *card = (isdnloop_card *) data;
      isdnloop_atimeout(card, 0);
}

/*
 * Wrapper for isdnloop_atimeout().
 */
static void
isdnloop_atimeout1(unsigned long data)
{
      isdnloop_card *card = (isdnloop_card *) data;
      isdnloop_atimeout(card, 1);
}

/*
 * Install a watchdog for a user, not responding.
 *
 * Parameter:
 *   card = pointer to card struct.
 *   ch   = channel to watch for.
 */
static void
isdnloop_start_ctimer(isdnloop_card * card, int ch)
{
      unsigned long flags;

      spin_lock_irqsave(&card->isdnloop_lock, flags);
      init_timer(&card->c_timer[ch]);
      card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
      if (ch)
            card->c_timer[ch].function = isdnloop_atimeout1;
      else
            card->c_timer[ch].function = isdnloop_atimeout0;
      card->c_timer[ch].data = (unsigned long) card;
      add_timer(&card->c_timer[ch]);
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

/*
 * Kill a pending channel watchdog.
 *
 * Parameter:
 *   card = pointer to card struct.
 *   ch   = channel (0-based).
 */
static void
isdnloop_kill_ctimer(isdnloop_card * card, int ch)
{
      unsigned long flags;

      spin_lock_irqsave(&card->isdnloop_lock, flags);
      del_timer(&card->c_timer[ch]);
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

static u_char si2bit[] =
{0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
static u_char bit2si[] =
{1, 5, 7};

/*
 * Try finding a listener for an outgoing call.
 *
 * Parameter:
 *   card = pointer to calling card.
 *   p    = pointer to ICN-type setup-string.
 *   lch  = channel of calling card.
 *   cmd  = pointer to struct to be filled when parsing setup.
 * Return:
 *   0 = found match, alerting should happen.
 *   1 = found matching number but it is busy.
 *   2 = no matching listener.
 *   3 = found matching number but SI does not match.
 */
static int
isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
{
      isdnloop_card *cc = cards;
      unsigned long flags;
      int ch;
      int num_match;
      int i;
      char *e;
      char nbuf[32];

      isdnloop_parse_setup(p, cmd);
      while (cc) {
            for (ch = 0; ch < 2; ch++) {
                  /* Exclude ourself */
                  if ((cc == card) && (ch == lch))
                        continue;
                  num_match = 0;
                  switch (cc->ptype) {
                        case ISDN_PTYPE_EURO:
                              for (i = 0; i < 3; i++)
                                    if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
                                          num_match = 1;
                              break;
                        case ISDN_PTYPE_1TR6:
                              e = cc->eazlist[ch];
                              while (*e) {
                                    sprintf(nbuf, "%s%c", cc->s0num[0], *e);
                                    if (!(strcmp(nbuf, cmd->parm.setup.phone)))
                                          num_match = 1;
                                    e++;
                              }
                  }
                  if (num_match) {
                        spin_lock_irqsave(&card->isdnloop_lock, flags);
                        /* channel idle? */
                        if (!(cc->rcard[ch])) {
                              /* Check SI */
                              if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
                                    spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                                    return 3;
                              }
                              /* ch is idle, si and number matches */
                              cc->rcard[ch] = card;
                              cc->rch[ch] = lch;
                              card->rcard[lch] = cc;
                              card->rch[lch] = ch;
                              spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                              return 0;
                        } else {
                              spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                              /* num matches, but busy */
                              if (ch == 1)
                                    return 1;
                        }
                  }
            }
            cc = cc->next;
      }
      return 2;
}

/*
 * Depending on D-channel protocol and caller/called, modify
 * phone number.
 *
 * Parameter:
 *   card   = pointer to card struct.
 *   phone  = pointer phone number.
 *   caller = flag: 1 = caller, 0 = called.
 * Return:
 *   pointer to new phone number.
 */
static char *
isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
{
      int i;
      static char nphone[30];

      if (!card) {
            printk("BUG!!!\n");
            return "";
      }
      switch (card->ptype) {
            case ISDN_PTYPE_EURO:
                  if (caller) {
                        for (i = 0; i < 2; i++)
                              if (!(strcmp(card->s0num[i], phone)))
                                    return (phone);
                        return (card->s0num[0]);
                  }
                  return (phone);
                  break;
            case ISDN_PTYPE_1TR6:
                  if (caller) {
                        sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
                        return (nphone);
                  } else
                        return (&phone[strlen(phone) - 1]);
                  break;
      }
      return "";
}

/*
 * Parse an ICN-type command string sent to the 'card'.
 * Perform misc. actions depending on the command.
 *
 * Parameter:
 *   card = pointer to card struct.
 */
static void
isdnloop_parse_cmd(isdnloop_card * card)
{
      char *p = card->omsg;
      isdn_ctrl cmd;
      char buf[60];
      isdnloop_stat *s = isdnloop_cmd_table;
      int action = -1;
      int i;
      int ch;

      if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
            isdnloop_fake_err(card);
            return;
      }
      ch = card->omsg[1] - '0';
      if ((ch < 0) || (ch > 2)) {
            isdnloop_fake_err(card);
            return;
      }
      p += 3;
      while (s->statstr) {
            if (!strncmp(p, s->statstr, strlen(s->statstr))) {
                  action = s->action;
                  if (s->command && (ch != 0)) {
                        isdnloop_fake_err(card);
                        return;
                  }
                  break;
            }
            s++;
      }
      if (action == -1)
            return;
      switch (action) {
            case 1:
                  /* 0x;BCON_R */
                  if (card->rcard[ch - 1]) {
                        isdnloop_fake(card->rcard[ch - 1], "BCON_I",
                                    card->rch[ch - 1] + 1);
                        isdnloop_fake(card, "BCON_C", ch);
                  }
                  break;
            case 17:
                  /* 0x;BCON_I */
                  if (card->rcard[ch - 1]) {
                        isdnloop_fake(card->rcard[ch - 1], "BCON_C",
                                    card->rch[ch - 1] + 1);
                  }
                  break;
            case 2:
                  /* 0x;BDIS_R */
                  isdnloop_fake(card, "BDIS_C", ch);
                  if (card->rcard[ch - 1]) {
                        isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
                                    card->rch[ch - 1] + 1);
                  }
                  break;
            case 16:
                  /* 0x;DCON_R */
                  isdnloop_kill_ctimer(card, ch - 1);
                  if (card->rcard[ch - 1]) {
                        isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
                        isdnloop_fake(card->rcard[ch - 1], "DCON_C",
                                    card->rch[ch - 1] + 1);
                        isdnloop_fake(card, "DCON_C", ch);
                  }
                  break;
            case 3:
                  /* 0x;DDIS_R */
                  isdnloop_kill_ctimer(card, ch - 1);
                  if (card->rcard[ch - 1]) {
                        isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
                        isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
                                    card->rch[ch - 1] + 1);
                        card->rcard[ch - 1] = NULL;
                  }
                  isdnloop_fake(card, "DDIS_C", ch);
                  break;
            case 4:
                  /* 0x;DSCA_Rdd,yy,zz,oo */
                  if (card->ptype != ISDN_PTYPE_1TR6) {
                        isdnloop_fake_err(card);
                        return;
                  }
                  /* Fall through */
            case 5:
                  /* 0x;DCAL_Rdd,yy,zz,oo */
                  p += 6;
                  switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
                        case 0:
                              /* Alerting */
                              sprintf(buf, "D%s_I%s,%02d,%02d,%s",
                                 (action == 4) ? "SCA" : "CAL",
                                    isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
                                    cmd.parm.setup.si1,
                                    cmd.parm.setup.si2,
                              isdnloop_vstphone(card->rcard[ch - 1],
                                     cmd.parm.setup.phone, 0));
                              isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
                              /* Fall through */
                        case 3:
                              /* si1 does not match, don't alert but start timer */
                              isdnloop_start_ctimer(card, ch - 1);
                              break;
                        case 1:
                              /* Remote busy */
                              isdnloop_fake(card, "DDIS_I", ch);
                              sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
                              isdnloop_fake(card, buf, ch);
                              break;
                        case 2:
                              /* No such user */
                              isdnloop_fake(card, "DDIS_I", ch);
                              sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
                              isdnloop_fake(card, buf, ch);
                              break;
                  }
                  break;
            case 6:
                  /* 0x;EAZC */
                  card->eazlist[ch - 1][0] = '\0';
                  break;
            case 7:
                  /* 0x;EAZ */
                  p += 3;
                  strcpy(card->eazlist[ch - 1], p);
                  break;
            case 8:
                  /* 0x;SEEAZ */
                  sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
                  isdnloop_fake(card, buf, ch + 1);
                  break;
            case 9:
                  /* 0x;MSN */
                  break;
            case 10:
                  /* 0x;MSNALL */
                  break;
            case 11:
                  /* 0x;SETSIL */
                  p += 6;
                  i = 0;
                  while (strchr("0157", *p)) {
                        if (i)
                              card->sil[ch - 1] |= si2bit[*p - '0'];
                        i = (*p++ == '0');
                  }
                  if (*p)
                        isdnloop_fake_err(card);
                  break;
            case 12:
                  /* 0x;SEESIL */
                  sprintf(buf, "SIN-LIST: ");
                  p = buf + 10;
                  for (i = 0; i < 3; i++)
                        if (card->sil[ch - 1] & (1 << i))
                              p += sprintf(p, "%02d", bit2si[i]);
                  isdnloop_fake(card, buf, ch + 1);
                  break;
            case 13:
                  /* 0x;SILC */
                  card->sil[ch - 1] = 0;
                  break;
            case 14:
                  /* 00;FV2ON */
                  break;
            case 15:
                  /* 00;FV2OFF */
                  break;
      }
}

/*
 * Put command-strings into the of the 'card'. In reality, execute them
 * right in place by calling isdnloop_parse_cmd(). Also copy every
 * command to the read message ringbuffer, preceeding it with a '>'.
 * These mesagges can be read at /dev/isdnctrl.
 *
 * Parameter:
 *   buf  = pointer to command buffer.
 *   len  = length of buffer data.
 *   user = flag: 1 = called form userlevel, 0 called from kernel.
 *   card = pointer to card struct.
 * Return:
 *   number of bytes transferred (currently always equals len).
 */
static int
isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
{
      int xcount = 0;
      int ocount = 1;
      isdn_ctrl cmd;

      while (len) {
            int count = len;
            u_char *p;
            u_char msg[0x100];

            if (count > 255)
                  count = 255;
            if (user) {
                  if (copy_from_user(msg, buf, count))
                        return -EFAULT;
            } else
                  memcpy(msg, buf, count);
            isdnloop_putmsg(card, '>');
            for (p = msg; count > 0; count--, p++) {
                  len--;
                  xcount++;
                  isdnloop_putmsg(card, *p);
                  card->omsg[card->optr] = *p;
                  if (*p == '\n') {
                        card->omsg[card->optr] = '\0';
                        card->optr = 0;
                        isdnloop_parse_cmd(card);
                        if (len) {
                              isdnloop_putmsg(card, '>');
                              ocount++;
                        }
                  } else {
                        if (card->optr < 59)
                              card->optr++;
                  }
                  ocount++;
            }
      }
      cmd.command = ISDN_STAT_STAVAIL;
      cmd.driver = card->myid;
      cmd.arg = ocount;
      card->interface.statcallb(&cmd);
      return xcount;
}

/*
 * Delete card's pending timers, send STOP to linklevel
 */
static void
isdnloop_stopcard(isdnloop_card * card)
{
      unsigned long flags;
      isdn_ctrl cmd;

      spin_lock_irqsave(&card->isdnloop_lock, flags);
      if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
            card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
            del_timer(&card->st_timer);
            del_timer(&card->rb_timer);
            del_timer(&card->c_timer[0]);
            del_timer(&card->c_timer[1]);
            cmd.command = ISDN_STAT_STOP;
            cmd.driver = card->myid;
            card->interface.statcallb(&cmd);
      }
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}

/*
 * Stop all cards before unload.
 */
static void
isdnloop_stopallcards(void)
{
      isdnloop_card *p = cards;

      while (p) {
            isdnloop_stopcard(p);
            p = p->next;
      }
}

/*
 * Start a 'card'. Simulate card's boot message and set the phone
 * number(s) of the virtual 'S0-Interface'. Install D-channel
 * poll timer.
 *
 * Parameter:
 *   card  = pointer to card struct.
 *   sdefp = pointer to struct holding ioctl parameters.
 * Return:
 *   0 on success, -E??? otherwise.
 */
static int
isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
{
      unsigned long flags;
      isdnloop_sdef sdef;
      int i;

      if (card->flags & ISDNLOOP_FLAGS_RUNNING)
            return -EBUSY;
      if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
            return -EFAULT;
      spin_lock_irqsave(&card->isdnloop_lock, flags);
      switch (sdef.ptype) {
            case ISDN_PTYPE_EURO:
                  if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
                                -1)) {
                        spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                        return -ENOMEM;
                  }
                  card->sil[0] = card->sil[1] = 4;
                  if (isdnloop_fake(card, "TEI OK", 0)) {
                        spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                        return -ENOMEM;
                  }
                  for (i = 0; i < 3; i++)
                        strcpy(card->s0num[i], sdef.num[i]);
                  break;
            case ISDN_PTYPE_1TR6:
                  if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
                                -1)) {
                        spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                        return -ENOMEM;
                  }
                  card->sil[0] = card->sil[1] = 4;
                  if (isdnloop_fake(card, "TEI OK", 0)) {
                        spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                        return -ENOMEM;
                  }
                  strcpy(card->s0num[0], sdef.num[0]);
                  card->s0num[1][0] = '\0';
                  card->s0num[2][0] = '\0';
                  break;
            default:
                  spin_unlock_irqrestore(&card->isdnloop_lock, flags);
                  printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
                         sdef.ptype);
                  return -EINVAL;
      }
      init_timer(&card->st_timer);
      card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
      card->st_timer.function = isdnloop_polldchan;
      card->st_timer.data = (unsigned long) card;
      add_timer(&card->st_timer);
      card->flags |= ISDNLOOP_FLAGS_RUNNING;
      spin_unlock_irqrestore(&card->isdnloop_lock, flags);
      return 0;
}

/*
 * Main handler for commands sent by linklevel.
 */
static int
isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
{
      ulong a;
      int i;
      char cbuf[60];
      isdn_ctrl cmd;
      isdnloop_cdef cdef;

      switch (c->command) {
            case ISDN_CMD_IOCTL:
                  memcpy(&a, c->parm.num, sizeof(ulong));
                  switch (c->arg) {
                        case ISDNLOOP_IOCTL_DEBUGVAR:
                              return (ulong) card;
                        case ISDNLOOP_IOCTL_STARTUP:
                              if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
                                    return -EFAULT;
                              return (isdnloop_start(card, (isdnloop_sdef *) a));
                              break;
                        case ISDNLOOP_IOCTL_ADDCARD:
                              if (copy_from_user((char *)&cdef,
                                             (char *)a,
                                             sizeof(cdef)))
                                    return -EFAULT;
                              return (isdnloop_addcard(cdef.id1));
                              break;
                        case ISDNLOOP_IOCTL_LEASEDCFG:
                              if (a) {
                                    if (!card->leased) {
                                          card->leased = 1;
                                          while (card->ptype == ISDN_PTYPE_UNKNOWN)
                                                schedule_timeout_interruptible(10);
                                          schedule_timeout_interruptible(10);
                                          sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
                                          i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                                          printk(KERN_INFO
                                                 "isdnloop: (%s) Leased-line mode enabled\n",
                                                 CID);
                                          cmd.command = ISDN_STAT_RUN;
                                          cmd.driver = card->myid;
                                          cmd.arg = 0;
                                          card->interface.statcallb(&cmd);
                                    }
                              } else {
                                    if (card->leased) {
                                          card->leased = 0;
                                          sprintf(cbuf, "00;FV2OFF\n");
                                          i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                                          printk(KERN_INFO
                                                 "isdnloop: (%s) Leased-line mode disabled\n",
                                                 CID);
                                          cmd.command = ISDN_STAT_RUN;
                                          cmd.driver = card->myid;
                                          cmd.arg = 0;
                                          card->interface.statcallb(&cmd);
                                    }
                              }
                              return 0;
                        default:
                              return -EINVAL;
                  }
                  break;
            case ISDN_CMD_DIAL:
                  if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                        return -ENODEV;
                  if (card->leased)
                        break;
                  if ((c->arg & 255) < ISDNLOOP_BCH) {
                        char *p;
                        char dial[50];
                        char dcode[4];

                        a = c->arg;
                        p = c->parm.setup.phone;
                        if (*p == 's' || *p == 'S') {
                              /* Dial for SPV */
                              p++;
                              strcpy(dcode, "SCA");
                        } else
                              /* Normal Dial */
                              strcpy(dcode, "CAL");
                        strcpy(dial, p);
                        sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
                              dcode, dial, c->parm.setup.si1,
                        c->parm.setup.si2, c->parm.setup.eazmsn);
                        i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                  }
                  break;
            case ISDN_CMD_ACCEPTD:
                  if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                        return -ENODEV;
                  if (c->arg < ISDNLOOP_BCH) {
                        a = c->arg + 1;
                        cbuf[0] = 0;
                        switch (card->l2_proto[a - 1]) {
                              case ISDN_PROTO_L2_X75I:
                                    sprintf(cbuf, "%02d;BX75\n", (int) a);
                                    break;
#ifdef CONFIG_ISDN_X25
                              case ISDN_PROTO_L2_X25DTE:
                                    sprintf(cbuf, "%02d;BX2T\n", (int) a);
                                    break;
                              case ISDN_PROTO_L2_X25DCE:
                                    sprintf(cbuf, "%02d;BX2C\n", (int) a);
                                    break;
#endif
                              case ISDN_PROTO_L2_HDLC:
                                    sprintf(cbuf, "%02d;BTRA\n", (int) a);
                                    break;
                        }
                        if (strlen(cbuf))
                              i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                        sprintf(cbuf, "%02d;DCON_R\n", (int) a);
                        i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                  }
                  break;
            case ISDN_CMD_ACCEPTB:
                  if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                        return -ENODEV;
                  if (c->arg < ISDNLOOP_BCH) {
                        a = c->arg + 1;
                        switch (card->l2_proto[a - 1]) {
                              case ISDN_PROTO_L2_X75I:
                                    sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
                                    break;
#ifdef CONFIG_ISDN_X25
                              case ISDN_PROTO_L2_X25DTE:
                                    sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
                                    break;
                              case ISDN_PROTO_L2_X25DCE:
                                    sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
                                    break;
#endif
                              case ISDN_PROTO_L2_HDLC:
                                    sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
                                    break;
                              default:
                                    sprintf(cbuf, "%02d;BCON_R\n", (int) a);
                        }
                        printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
                        i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                        break;
            case ISDN_CMD_HANGUP:
                        if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                              return -ENODEV;
                        if (c->arg < ISDNLOOP_BCH) {
                              a = c->arg + 1;
                              sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
                              i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                        }
                        break;
            case ISDN_CMD_SETEAZ:
                        if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                              return -ENODEV;
                        if (card->leased)
                              break;
                        if (c->arg < ISDNLOOP_BCH) {
                              a = c->arg + 1;
                              if (card->ptype == ISDN_PTYPE_EURO) {
                                    sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
                                          c->parm.num[0] ? "N" : "ALL", c->parm.num);
                              } else
                                    sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
                                          c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
                              i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                        }
                        break;
            case ISDN_CMD_CLREAZ:
                        if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                              return -ENODEV;
                        if (card->leased)
                              break;
                        if (c->arg < ISDNLOOP_BCH) {
                              a = c->arg + 1;
                              if (card->ptype == ISDN_PTYPE_EURO)
                                    sprintf(cbuf, "%02d;MSNC\n", (int) a);
                              else
                                    sprintf(cbuf, "%02d;EAZC\n", (int) a);
                              i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                        }
                        break;
            case ISDN_CMD_SETL2:
                        if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                              return -ENODEV;
                        if ((c->arg & 255) < ISDNLOOP_BCH) {
                              a = c->arg;
                              switch (a >> 8) {
                                    case ISDN_PROTO_L2_X75I:
                                          sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
                                          break;
#ifdef CONFIG_ISDN_X25
                                    case ISDN_PROTO_L2_X25DTE:
                                          sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
                                          break;
                                    case ISDN_PROTO_L2_X25DCE:
                                          sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
                                          break;
#endif
                                    case ISDN_PROTO_L2_HDLC:
                                          sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
                                          break;
                                    case ISDN_PROTO_L2_TRANS:
                                          sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
                                          break;
                                    default:
                                          return -EINVAL;
                              }
                              i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
                              card->l2_proto[a & 255] = (a >> 8);
                        }
                        break;
            case ISDN_CMD_SETL3:
                        if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                              return -ENODEV;
                        return 0;
            default:
                        return -EINVAL;
                  }
      }
      return 0;
}

/*
 * Find card with given driverId
 */
static inline isdnloop_card *
isdnloop_findcard(int driverid)
{
      isdnloop_card *p = cards;

      while (p) {
            if (p->myid == driverid)
                  return p;
            p = p->next;
      }
      return (isdnloop_card *) 0;
}

/*
 * Wrapper functions for interface to linklevel
 */
static int
if_command(isdn_ctrl * c)
{
      isdnloop_card *card = isdnloop_findcard(c->driver);

      if (card)
            return (isdnloop_command(c, card));
      printk(KERN_ERR
             "isdnloop: if_command called with invalid driverId!\n");
      return -ENODEV;
}

static int
if_writecmd(const u_char __user *buf, int len, int id, int channel)
{
      isdnloop_card *card = isdnloop_findcard(id);

      if (card) {
            if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                  return -ENODEV;
            return (isdnloop_writecmd(buf, len, 1, card));
      }
      printk(KERN_ERR
             "isdnloop: if_writecmd called with invalid driverId!\n");
      return -ENODEV;
}

static int
if_readstatus(u_char __user *buf, int len, int id, int channel)
{
      isdnloop_card *card = isdnloop_findcard(id);

      if (card) {
            if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                  return -ENODEV;
            return (isdnloop_readstatus(buf, len, card));
      }
      printk(KERN_ERR
             "isdnloop: if_readstatus called with invalid driverId!\n");
      return -ENODEV;
}

static int
if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
{
      isdnloop_card *card = isdnloop_findcard(id);

      if (card) {
            if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
                  return -ENODEV;
            /* ack request stored in skb scratch area */
            *(skb->head) = ack;
            return (isdnloop_sendbuf(channel, skb, card));
      }
      printk(KERN_ERR
             "isdnloop: if_sendbuf called with invalid driverId!\n");
      return -ENODEV;
}

/*
 * Allocate a new card-struct, initialize it
 * link it into cards-list and register it at linklevel.
 */
static isdnloop_card *
isdnloop_initcard(char *id)
{
      isdnloop_card *card;
      int i;

      if (!(card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
            printk(KERN_WARNING
             "isdnloop: (%s) Could not allocate card-struct.\n", id);
            return (isdnloop_card *) 0;
      }
      card->interface.owner = THIS_MODULE;
      card->interface.channels = ISDNLOOP_BCH;
      card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/ 
      card->interface.maxbufsize = 4000;
      card->interface.command = if_command;
      card->interface.writebuf_skb = if_sendbuf;
      card->interface.writecmd = if_writecmd;
      card->interface.readstat = if_readstatus;
      card->interface.features = ISDN_FEATURE_L2_X75I |
#ifdef CONFIG_ISDN_X25
          ISDN_FEATURE_L2_X25DTE |
          ISDN_FEATURE_L2_X25DCE |
#endif
          ISDN_FEATURE_L2_HDLC |
          ISDN_FEATURE_L3_TRANS |
          ISDN_FEATURE_P_UNKNOWN;
      card->ptype = ISDN_PTYPE_UNKNOWN;
      strlcpy(card->interface.id, id, sizeof(card->interface.id));
      card->msg_buf_write = card->msg_buf;
      card->msg_buf_read = card->msg_buf;
      card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
      for (i = 0; i < ISDNLOOP_BCH; i++) {
            card->l2_proto[i] = ISDN_PROTO_L2_X75I;
            skb_queue_head_init(&card->bqueue[i]);
      }
      skb_queue_head_init(&card->dqueue);
      spin_lock_init(&card->isdnloop_lock);
      card->next = cards;
      cards = card;
      if (!register_isdn(&card->interface)) {
            cards = cards->next;
            printk(KERN_WARNING
                   "isdnloop: Unable to register %s\n", id);
            kfree(card);
            return (isdnloop_card *) 0;
      }
      card->myid = card->interface.channels;
      return card;
}

static int
isdnloop_addcard(char *id1)
{
      isdnloop_card *card;

      if (!(card = isdnloop_initcard(id1))) {
            return -EIO;
      }
      printk(KERN_INFO
             "isdnloop: (%s) virtual card added\n",
             card->interface.id);
      return 0;
}

static int __init
isdnloop_init(void)
{
      char *p;
      char rev[10];

      if ((p = strchr(revision, ':'))) {
            strcpy(rev, p + 1);
            p = strchr(rev, '$');
            *p = 0;
      } else
            strcpy(rev, " ??? ");
      printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);

      if (isdnloop_id)
            return (isdnloop_addcard(isdnloop_id));

      return 0;
}

static void __exit
isdnloop_exit(void)
{
      isdn_ctrl cmd;
      isdnloop_card *card = cards;
      isdnloop_card *last;
      int i;

      isdnloop_stopallcards();
      while (card) {
            cmd.command = ISDN_STAT_UNLOAD;
            cmd.driver = card->myid;
            card->interface.statcallb(&cmd);
            for (i = 0; i < ISDNLOOP_BCH; i++)
                  isdnloop_free_queue(card, i);
            card = card->next;
      }
      card = cards;
      while (card) {
            last = card;
            skb_queue_purge(&card->dqueue);
            card = card->next;
            kfree(last);
      }
      printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
}

module_init(isdnloop_init);
module_exit(isdnloop_exit);

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