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isdn_common.c

/* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
 *
 * Linux ISDN subsystem, common used functions (linklevel).
 *
 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
 * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.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/init.h>
#include <linux/poll.h>
#include <linux/vmalloc.h>
#include <linux/isdn.h>
#include <linux/smp_lock.h>
#include "isdn_common.h"
#include "isdn_tty.h"
#include "isdn_net.h"
#include "isdn_ppp.h"
#ifdef CONFIG_ISDN_AUDIO
#include "isdn_audio.h"
#endif
#ifdef CONFIG_ISDN_DIVERSION_MODULE
#define CONFIG_ISDN_DIVERSION
#endif
#ifdef CONFIG_ISDN_DIVERSION
#include <linux/isdn_divertif.h>
#endif /* CONFIG_ISDN_DIVERSION */
#include "isdn_v110.h"

/* Debugflags */
#undef ISDN_DEBUG_STATCALLB

MODULE_DESCRIPTION("ISDN4Linux: link layer");
MODULE_AUTHOR("Fritz Elfert");
MODULE_LICENSE("GPL");

isdn_dev *dev;

static char *isdn_revision = "$Revision: 1.1.2.3 $";

extern char *isdn_net_revision;
extern char *isdn_tty_revision;
#ifdef CONFIG_ISDN_PPP
extern char *isdn_ppp_revision;
#else
static char *isdn_ppp_revision = ": none $";
#endif
#ifdef CONFIG_ISDN_AUDIO
extern char *isdn_audio_revision;
#else
static char *isdn_audio_revision = ": none $";
#endif
extern char *isdn_v110_revision;

#ifdef CONFIG_ISDN_DIVERSION
static isdn_divert_if *divert_if; /* = NULL */
#endif /* CONFIG_ISDN_DIVERSION */


static int isdn_writebuf_stub(int, int, const u_char __user *, int);
static void set_global_features(void);
static int isdn_wildmat(char *s, char *p);
static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);

static inline void
isdn_lock_driver(isdn_driver_t *drv)
{
      try_module_get(drv->interface->owner);
      drv->locks++;
}

void
isdn_lock_drivers(void)
{
      int i;

      for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
            if (!dev->drv[i])
                  continue;
            isdn_lock_driver(dev->drv[i]);
      }
}

static inline void
isdn_unlock_driver(isdn_driver_t *drv)
{
      if (drv->locks > 0) {
            drv->locks--;
            module_put(drv->interface->owner);
      }
}

void
isdn_unlock_drivers(void)
{
      int i;

      for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
            if (!dev->drv[i])
                  continue;
            isdn_unlock_driver(dev->drv[i]);
      }
}

#if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
void
isdn_dumppkt(char *s, u_char * p, int len, int dumplen)
{
      int dumpc;

      printk(KERN_DEBUG "%s(%d) ", s, len);
      for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
            printk(" %02x", *p++);
      printk("\n");
}
#endif

/*
 * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
 */
static int
isdn_star(char *s, char *p)
{
      while (isdn_wildmat(s, p)) {
            if (*++s == '\0')
                  return (2);
      }
      return (0);
}

/*
 * Shell-type Pattern-matching for incoming caller-Ids
 * This function gets a string in s and checks, if it matches the pattern
 * given in p.
 *
 * Return:
 *   0 = match.
 *   1 = no match.
 *   2 = no match. Would eventually match, if s would be longer.
 *
 * Possible Patterns:
 *
 * '?'     matches one character
 * '*'     matches zero or more characters
 * [xyz]   matches the set of characters in brackets.
 * [^xyz]  matches any single character not in the set of characters
 */

static int
isdn_wildmat(char *s, char *p)
{
      register int last;
      register int matched;
      register int reverse;
      register int nostar = 1;

      if (!(*s) && !(*p))
            return(1);
      for (; *p; s++, p++)
            switch (*p) {
                  case '\\':
                        /*
                         * Literal match with following character,
                         * fall through.
                         */
                        p++;
                  default:
                        if (*s != *p)
                              return (*s == '\0')?2:1;
                        continue;
                  case '?':
                        /* Match anything. */
                        if (*s == '\0')
                              return (2);
                        continue;
                  case '*':
                        nostar = 0; 
                        /* Trailing star matches everything. */
                        return (*++p ? isdn_star(s, p) : 0);
                  case '[':
                        /* [^....] means inverse character class. */
                        if ((reverse = (p[1] == '^')))
                              p++;
                        for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
                              /* This next line requires a good C compiler. */
                              if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
                                    matched = 1;
                        if (matched == reverse)
                              return (1);
                        continue;
            }
      return (*s == '\0')?0:nostar;
}

int isdn_msncmp( const char * msn1, const char * msn2 )
{
      char TmpMsn1[ ISDN_MSNLEN ];
      char TmpMsn2[ ISDN_MSNLEN ];
      char *p;

      for ( p = TmpMsn1; *msn1 && *msn1 != ':'; )  // Strip off a SPID
            *p++ = *msn1++;
      *p = '\0';

      for ( p = TmpMsn2; *msn2 && *msn2 != ':'; )  // Strip off a SPID
            *p++ = *msn2++;
      *p = '\0';

      return isdn_wildmat( TmpMsn1, TmpMsn2 );
}

int
isdn_dc2minor(int di, int ch)
{
      int i;
      for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
                  return i;
      return -1;
}

static int isdn_timer_cnt1 = 0;
static int isdn_timer_cnt2 = 0;
static int isdn_timer_cnt3 = 0;

static void
isdn_timer_funct(ulong dummy)
{
      int tf = dev->tflags;
      if (tf & ISDN_TIMER_FAST) {
            if (tf & ISDN_TIMER_MODEMREAD)
                  isdn_tty_readmodem();
            if (tf & ISDN_TIMER_MODEMPLUS)
                  isdn_tty_modem_escape();
            if (tf & ISDN_TIMER_MODEMXMIT)
                  isdn_tty_modem_xmit();
      }
      if (tf & ISDN_TIMER_SLOW) {
            if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
                  isdn_timer_cnt1 = 0;
                  if (tf & ISDN_TIMER_NETDIAL)
                        isdn_net_dial();
            }
            if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
                  isdn_timer_cnt2 = 0;
                  if (tf & ISDN_TIMER_NETHANGUP)
                        isdn_net_autohup();
                  if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
                        isdn_timer_cnt3 = 0;
                        if (tf & ISDN_TIMER_MODEMRING)
                              isdn_tty_modem_ring();
                  }
                  if (tf & ISDN_TIMER_CARRIER)
                        isdn_tty_carrier_timeout();
            }
      }
      if (tf) 
            mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
}

void
isdn_timer_ctrl(int tf, int onoff)
{
      unsigned long flags;
      int old_tflags;

      spin_lock_irqsave(&dev->timerlock, flags);
      if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
            /* If the slow-timer wasn't activated until now */
            isdn_timer_cnt1 = 0;
            isdn_timer_cnt2 = 0;
      }
      old_tflags = dev->tflags;
      if (onoff)
            dev->tflags |= tf;
      else
            dev->tflags &= ~tf;
      if (dev->tflags && !old_tflags)
            mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
      spin_unlock_irqrestore(&dev->timerlock, flags);
}

/*
 * Receive a packet from B-Channel. (Called from low-level-module)
 */
static void
isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
{
      int i;

      if ((i = isdn_dc2minor(di, channel)) == -1) {
            dev_kfree_skb(skb);
            return;
      }
      /* Update statistics */
      dev->ibytes[i] += skb->len;
      
      /* First, try to deliver data to network-device */
      if (isdn_net_rcv_skb(i, skb))
            return;

      /* V.110 handling
       * makes sense for async streams only, so it is
       * called after possible net-device delivery.
       */
      if (dev->v110[i]) {
            atomic_inc(&dev->v110use[i]);
            skb = isdn_v110_decode(dev->v110[i], skb);
            atomic_dec(&dev->v110use[i]);
            if (!skb)
                  return;
      }

      /* No network-device found, deliver to tty or raw-channel */
      if (skb->len) {
            if (isdn_tty_rcv_skb(i, di, channel, skb))
                  return;
            wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
      } else
            dev_kfree_skb(skb);
}

/*
 * Intercept command from Linklevel to Lowlevel.
 * If layer 2 protocol is V.110 and this is not supported by current
 * lowlevel-driver, use driver's transparent mode and handle V.110 in
 * linklevel instead.
 */
int
isdn_command(isdn_ctrl *cmd)
{
      if (cmd->driver == -1) {
            printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
            return(1);
      }
      if (!dev->drv[cmd->driver]) {
            printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
                  cmd->command, cmd->driver);
            return(1);
      }
      if (!dev->drv[cmd->driver]->interface) {
            printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
                  cmd->command, cmd->driver);
            return(1);
      }
      if (cmd->command == ISDN_CMD_SETL2) {
            int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
            unsigned long l2prot = (cmd->arg >> 8) & 255;
            unsigned long features = (dev->drv[cmd->driver]->interface->features
                                    >> ISDN_FEATURE_L2_SHIFT) &
                                    ISDN_FEATURE_L2_MASK;
            unsigned long l2_feature = (1 << l2prot);

            switch (l2prot) {
                  case ISDN_PROTO_L2_V11096:
                  case ISDN_PROTO_L2_V11019:
                  case ISDN_PROTO_L2_V11038:
                  /* If V.110 requested, but not supported by
                   * HL-driver, set emulator-flag and change
                   * Layer-2 to transparent
                   */
                        if (!(features & l2_feature)) {
                              dev->v110emu[idx] = l2prot;
                              cmd->arg = (cmd->arg & 255) |
                                    (ISDN_PROTO_L2_TRANS << 8);
                        } else
                              dev->v110emu[idx] = 0;
            }
      }
      return dev->drv[cmd->driver]->interface->command(cmd);
}

void
isdn_all_eaz(int di, int ch)
{
      isdn_ctrl cmd;

      if (di < 0)
            return;
      cmd.driver = di;
      cmd.arg = ch;
      cmd.command = ISDN_CMD_SETEAZ;
      cmd.parm.num[0] = '\0';
      isdn_command(&cmd);
}

/*
 * Begin of a CAPI like LL<->HL interface, currently used only for 
 * supplementary service (CAPI 2.0 part III)
 */
#include <linux/isdn/capicmd.h>

static int
isdn_capi_rec_hl_msg(capi_msg *cm) {
      
      int di;
      int ch;
      
      di = (cm->adr.Controller & 0x7f) -1;
      ch = isdn_dc2minor(di, (cm->adr.Controller>>8)& 0x7f);
      switch(cm->Command) {
            case CAPI_FACILITY:
                  /* in the moment only handled in tty */
                  return(isdn_tty_capi_facility(cm));
            default:
                  return(-1);
      }
}

static int
isdn_status_callback(isdn_ctrl * c)
{
      int di;
      u_long flags;
      int i;
      int r;
      int retval = 0;
      isdn_ctrl cmd;
      isdn_net_dev *p;

      di = c->driver;
      i = isdn_dc2minor(di, c->arg);
      switch (c->command) {
            case ISDN_STAT_BSENT:
                  if (i < 0)
                        return -1;
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  if (isdn_net_stat_callback(i, c))
                        return 0;
                  if (isdn_v110_stat_callback(i, c))
                        return 0;
                  if (isdn_tty_stat_callback(i, c))
                        return 0;
                  wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
                  break;
            case ISDN_STAT_STAVAIL:
                  dev->drv[di]->stavail += c->arg;
                  wake_up_interruptible(&dev->drv[di]->st_waitq);
                  break;
            case ISDN_STAT_RUN:
                  dev->drv[di]->flags |= DRV_FLAG_RUNNING;
                  for (i = 0; i < ISDN_MAX_CHANNELS; i++)
                        if (dev->drvmap[i] == di)
                              isdn_all_eaz(di, dev->chanmap[i]);
                  set_global_features();
                  break;
            case ISDN_STAT_STOP:
                  dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
                  break;
            case ISDN_STAT_ICALL:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
                        cmd.driver = di;
                        cmd.arg = c->arg;
                        cmd.command = ISDN_CMD_HANGUP;
                        isdn_command(&cmd);
                        return 0;
                  }
                  /* Try to find a network-interface which will accept incoming call */
                  r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
                  switch (r) {
                        case 0:
                              /* No network-device replies.
                               * Try ttyI's.
                               * These return 0 on no match, 1 on match and
                               * 3 on eventually match, if CID is longer.
                               */
                                        if (c->command == ISDN_STAT_ICALL)
                                if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return(retval);
#ifdef CONFIG_ISDN_DIVERSION 
                                         if (divert_if)
                                    if ((retval = divert_if->stat_callback(c))) 
                                  return(retval); /* processed */
#endif /* CONFIG_ISDN_DIVERSION */                       
                              if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
                                    /* No tty responding */
                                    cmd.driver = di;
                                    cmd.arg = c->arg;
                                    cmd.command = ISDN_CMD_HANGUP;
                                    isdn_command(&cmd);
                                    retval = 2;
                              }
                              break;
                        case 1:
                              /* Schedule connection-setup */
                              isdn_net_dial();
                              cmd.driver = di;
                              cmd.arg = c->arg;
                              cmd.command = ISDN_CMD_ACCEPTD;
                              for ( p = dev->netdev; p; p = p->next )
                                    if ( p->local->isdn_channel == cmd.arg )
                                    {
                                          strcpy( cmd.parm.setup.eazmsn, p->local->msn );
                                          isdn_command(&cmd);
                                          retval = 1;
                                          break;
                                    }
                              break;

                        case 2:     /* For calling back, first reject incoming call ... */
                        case 3:     /* Interface found, but down, reject call actively  */
                              retval = 2;
                              printk(KERN_INFO "isdn: Rejecting Call\n");
                              cmd.driver = di;
                              cmd.arg = c->arg;
                              cmd.command = ISDN_CMD_HANGUP;
                              isdn_command(&cmd);
                              if (r == 3)
                                    break;
                              /* Fall through */
                        case 4:
                              /* ... then start callback. */
                              isdn_net_dial();
                              break;
                        case 5:
                              /* Number would eventually match, if longer */
                              retval = 3;
                              break;
                  }
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
#endif
                  return retval;
                  break;
            case ISDN_STAT_CINF:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  if (strcmp(c->parm.num, "0"))
                        isdn_net_stat_callback(i, c);
                  isdn_tty_stat_callback(i, c);
                  break;
            case ISDN_STAT_CAUSE:
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
#endif
                  printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
                         dev->drvid[di], c->arg, c->parm.num);
                  isdn_tty_stat_callback(i, c);
#ifdef CONFIG_ISDN_DIVERSION
                        if (divert_if)
                         divert_if->stat_callback(c); 
#endif /* CONFIG_ISDN_DIVERSION */
                  break;
            case ISDN_STAT_DISPLAY:
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
#endif
                  isdn_tty_stat_callback(i, c);
#ifdef CONFIG_ISDN_DIVERSION
                        if (divert_if)
                         divert_if->stat_callback(c); 
#endif /* CONFIG_ISDN_DIVERSION */
                  break;
            case ISDN_STAT_DCONN:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  /* Find any net-device, waiting for D-channel setup */
                  if (isdn_net_stat_callback(i, c))
                        break;
                  isdn_v110_stat_callback(i, c);
                  /* Find any ttyI, waiting for D-channel setup */
                  if (isdn_tty_stat_callback(i, c)) {
                        cmd.driver = di;
                        cmd.arg = c->arg;
                        cmd.command = ISDN_CMD_ACCEPTB;
                        isdn_command(&cmd);
                        break;
                  }
                  break;
            case ISDN_STAT_DHUP:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  dev->drv[di]->online &= ~(1 << (c->arg));
                  isdn_info_update();
                  /* Signal hangup to network-devices */
                  if (isdn_net_stat_callback(i, c))
                        break;
                  isdn_v110_stat_callback(i, c);
                  if (isdn_tty_stat_callback(i, c))
                        break;
#ifdef CONFIG_ISDN_DIVERSION
                        if (divert_if)
                         divert_if->stat_callback(c); 
#endif /* CONFIG_ISDN_DIVERSION */
                  break;
                  break;
            case ISDN_STAT_BCONN:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
#endif
                  /* Signal B-channel-connect to network-devices */
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  dev->drv[di]->online |= (1 << (c->arg));
                  isdn_info_update();
                  if (isdn_net_stat_callback(i, c))
                        break;
                  isdn_v110_stat_callback(i, c);
                  if (isdn_tty_stat_callback(i, c))
                        break;
                  break;
            case ISDN_STAT_BHUP:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  dev->drv[di]->online &= ~(1 << (c->arg));
                  isdn_info_update();
#ifdef CONFIG_ISDN_X25
                  /* Signal hangup to network-devices */
                  if (isdn_net_stat_callback(i, c))
                        break;
#endif
                  isdn_v110_stat_callback(i, c);
                  if (isdn_tty_stat_callback(i, c))
                        break;
                  break;
            case ISDN_STAT_NODCH:
                  if (i < 0)
                        return -1;
#ifdef ISDN_DEBUG_STATCALLB
                  printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
#endif
                  if (dev->global_flags & ISDN_GLOBAL_STOPPED)
                        return 0;
                  if (isdn_net_stat_callback(i, c))
                        break;
                  if (isdn_tty_stat_callback(i, c))
                        break;
                  break;
            case ISDN_STAT_ADDCH:
                  spin_lock_irqsave(&dev->lock, flags);
                  if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
                        spin_unlock_irqrestore(&dev->lock, flags);
                        return -1;
                  }
                  spin_unlock_irqrestore(&dev->lock, flags);
                  isdn_info_update();
                  break;
            case ISDN_STAT_DISCH:
                  spin_lock_irqsave(&dev->lock, flags);
                  for (i = 0; i < ISDN_MAX_CHANNELS; i++)
                        if ((dev->drvmap[i] == di) &&
                            (dev->chanmap[i] == c->arg)) {
                            if (c->parm.num[0])
                              dev->usage[i] &= ~ISDN_USAGE_DISABLED;
                            else
                              if (USG_NONE(dev->usage[i])) {
                              dev->usage[i] |= ISDN_USAGE_DISABLED;
                              }
                              else 
                              retval = -1;
                            break;
                        }
                  spin_unlock_irqrestore(&dev->lock, flags);
                  isdn_info_update();
                  break;
            case ISDN_STAT_UNLOAD:
                  while (dev->drv[di]->locks > 0) {
                        isdn_unlock_driver(dev->drv[di]);
                  }
                  spin_lock_irqsave(&dev->lock, flags);
                  isdn_tty_stat_callback(i, c);
                  for (i = 0; i < ISDN_MAX_CHANNELS; i++)
                        if (dev->drvmap[i] == di) {
                              dev->drvmap[i] = -1;
                              dev->chanmap[i] = -1;
                              dev->usage[i] &= ~ISDN_USAGE_DISABLED;
                        }
                  dev->drivers--;
                  dev->channels -= dev->drv[di]->channels;
                  kfree(dev->drv[di]->rcverr);
                  kfree(dev->drv[di]->rcvcount);
                  for (i = 0; i < dev->drv[di]->channels; i++)
                        skb_queue_purge(&dev->drv[di]->rpqueue[i]);
                  kfree(dev->drv[di]->rpqueue);
                  kfree(dev->drv[di]->rcv_waitq);
                  kfree(dev->drv[di]);
                  dev->drv[di] = NULL;
                  dev->drvid[di][0] = '\0';
                  isdn_info_update();
                  set_global_features();
                  spin_unlock_irqrestore(&dev->lock, flags);
                  return 0;
            case ISDN_STAT_L1ERR:
                  break;
            case CAPI_PUT_MESSAGE:
                  return(isdn_capi_rec_hl_msg(&c->parm.cmsg));
#ifdef CONFIG_ISDN_TTY_FAX
            case ISDN_STAT_FAXIND:
                  isdn_tty_stat_callback(i, c);
                  break;
#endif
#ifdef CONFIG_ISDN_AUDIO
            case ISDN_STAT_AUDIO:
                  isdn_tty_stat_callback(i, c);
                  break;
#endif
#ifdef CONFIG_ISDN_DIVERSION
              case ISDN_STAT_PROT:
              case ISDN_STAT_REDIR:
                        if (divert_if)
                          return(divert_if->stat_callback(c));
#endif /* CONFIG_ISDN_DIVERSION */
            default:
                  return -1;
      }
      return 0;
}

/*
 * Get integer from char-pointer, set pointer to end of number
 */
int
isdn_getnum(char **p)
{
      int v = -1;

      while (*p[0] >= '0' && *p[0] <= '9')
            v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
      return v;
}

#define DLE 0x10

/*
 * isdn_readbchan() tries to get data from the read-queue.
 * It MUST be called with interrupts off.
 *
 * Be aware that this is not an atomic operation when sleep != 0, even though 
 * interrupts are turned off! Well, like that we are currently only called
 * on behalf of a read system call on raw device files (which are documented
 * to be dangerous and for for debugging purpose only). The inode semaphore
 * takes care that this is not called for the same minor device number while
 * we are sleeping, but access is not serialized against simultaneous read()
 * from the corresponding ttyI device. Can other ugly events, like changes
 * of the mapping (di,ch)<->minor, happen during the sleep? --he 
 */
int
isdn_readbchan(int di, int channel, u_char * buf, u_char * fp, int len, wait_queue_head_t *sleep)
{
      int count;
      int count_pull;
      int count_put;
      int dflag;
      struct sk_buff *skb;
      u_char *cp;

      if (!dev->drv[di])
            return 0;
      if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
            if (sleep)
                  interruptible_sleep_on(sleep);
            else
                  return 0;
      }
      if (len > dev->drv[di]->rcvcount[channel])
            len = dev->drv[di]->rcvcount[channel];
      cp = buf;
      count = 0;
      while (len) {
            if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
                  break;
#ifdef CONFIG_ISDN_AUDIO
            if (ISDN_AUDIO_SKB_LOCK(skb))
                  break;
            ISDN_AUDIO_SKB_LOCK(skb) = 1;
            if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
                  char *p = skb->data;
                  unsigned long DLEmask = (1 << channel);

                  dflag = 0;
                  count_pull = count_put = 0;
                  while ((count_pull < skb->len) && (len > 0)) {
                        len--;
                        if (dev->drv[di]->DLEflag & DLEmask) {
                              *cp++ = DLE;
                              dev->drv[di]->DLEflag &= ~DLEmask;
                        } else {
                              *cp++ = *p;
                              if (*p == DLE) {
                                    dev->drv[di]->DLEflag |= DLEmask;
                                    (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
                              }
                              p++;
                              count_pull++;
                        }
                        count_put++;
                  }
                  if (count_pull >= skb->len)
                        dflag = 1;
            } else {
#endif
                  /* No DLE's in buff, so simply copy it */
                  dflag = 1;
                  if ((count_pull = skb->len) > len) {
                        count_pull = len;
                        dflag = 0;
                  }
                  count_put = count_pull;
                  skb_copy_from_linear_data(skb, cp, count_put);
                  cp += count_put;
                  len -= count_put;
#ifdef CONFIG_ISDN_AUDIO
            }
#endif
            count += count_put;
            if (fp) {
                  memset(fp, 0, count_put);
                  fp += count_put;
            }
            if (dflag) {
                  /* We got all the data in this buff.
                   * Now we can dequeue it.
                   */
                  if (fp)
                        *(fp - 1) = 0xff;
#ifdef CONFIG_ISDN_AUDIO
                  ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
                  skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
                  dev_kfree_skb(skb);
            } else {
                  /* Not yet emptied this buff, so it
                   * must stay in the queue, for further calls
                   * but we pull off the data we got until now.
                   */
                  skb_pull(skb, count_pull);
#ifdef CONFIG_ISDN_AUDIO
                  ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
            }
            dev->drv[di]->rcvcount[channel] -= count_put;
      }
      return count;
}

/*
 * isdn_readbchan_tty() tries to get data from the read-queue.
 * It MUST be called with interrupts off.
 *
 * Be aware that this is not an atomic operation when sleep != 0, even though
 * interrupts are turned off! Well, like that we are currently only called
 * on behalf of a read system call on raw device files (which are documented
 * to be dangerous and for for debugging purpose only). The inode semaphore
 * takes care that this is not called for the same minor device number while
 * we are sleeping, but access is not serialized against simultaneous read()
 * from the corresponding ttyI device. Can other ugly events, like changes
 * of the mapping (di,ch)<->minor, happen during the sleep? --he
 */
int
isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
{
      int count;
      int count_pull;
      int count_put;
      int dflag;
      struct sk_buff *skb;
      char last = 0;
      int len;

      if (!dev->drv[di])
            return 0;
      if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
                  return 0;

      len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
      if(len == 0)
            return len;

      count = 0;
      while (len) {
            if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
                  break;
#ifdef CONFIG_ISDN_AUDIO
            if (ISDN_AUDIO_SKB_LOCK(skb))
                  break;
            ISDN_AUDIO_SKB_LOCK(skb) = 1;
            if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
                  char *p = skb->data;
                  unsigned long DLEmask = (1 << channel);

                  dflag = 0;
                  count_pull = count_put = 0;
                  while ((count_pull < skb->len) && (len > 0)) {
                        /* push every character but the last to the tty buffer directly */
                        if ( count_put )
                              tty_insert_flip_char(tty, last, TTY_NORMAL);
                        len--;
                        if (dev->drv[di]->DLEflag & DLEmask) {
                              last = DLE;
                              dev->drv[di]->DLEflag &= ~DLEmask;
                        } else {
                              last = *p;
                              if (last == DLE) {
                                    dev->drv[di]->DLEflag |= DLEmask;
                                    (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
                              }
                              p++;
                              count_pull++;
                        }
                        count_put++;
                  }
                  if (count_pull >= skb->len)
                        dflag = 1;
            } else {
#endif
                  /* No DLE's in buff, so simply copy it */
                  dflag = 1;
                  if ((count_pull = skb->len) > len) {
                        count_pull = len;
                        dflag = 0;
                  }
                  count_put = count_pull;
                  if(count_put > 1)
                        tty_insert_flip_string(tty, skb->data, count_put - 1);
                  last = skb->data[count_put - 1];
                  len -= count_put;
#ifdef CONFIG_ISDN_AUDIO
            }
#endif
            count += count_put;
            if (dflag) {
                  /* We got all the data in this buff.
                   * Now we can dequeue it.
                   */
                  if(cisco_hack)
                        tty_insert_flip_char(tty, last, 0xFF);
                  else
                        tty_insert_flip_char(tty, last, TTY_NORMAL);
#ifdef CONFIG_ISDN_AUDIO
                  ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
                  skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
                  dev_kfree_skb(skb);
            } else {
                  tty_insert_flip_char(tty, last, TTY_NORMAL);
                  /* Not yet emptied this buff, so it
                   * must stay in the queue, for further calls
                   * but we pull off the data we got until now.
                   */
                  skb_pull(skb, count_pull);
#ifdef CONFIG_ISDN_AUDIO
                  ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
            }
            dev->drv[di]->rcvcount[channel] -= count_put;
      }
      return count;
}


static __inline int
isdn_minor2drv(int minor)
{
      return (dev->drvmap[minor]);
}

static __inline int
isdn_minor2chan(int minor)
{
      return (dev->chanmap[minor]);
}

static char *
isdn_statstr(void)
{
      static char istatbuf[2048];
      char *p;
      int i;

      sprintf(istatbuf, "idmap:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
            p = istatbuf + strlen(istatbuf);
      }
      sprintf(p, "\nchmap:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            sprintf(p, "%d ", dev->chanmap[i]);
            p = istatbuf + strlen(istatbuf);
      }
      sprintf(p, "\ndrmap:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            sprintf(p, "%d ", dev->drvmap[i]);
            p = istatbuf + strlen(istatbuf);
      }
      sprintf(p, "\nusage:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            sprintf(p, "%d ", dev->usage[i]);
            p = istatbuf + strlen(istatbuf);
      }
      sprintf(p, "\nflags:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
            if (dev->drv[i]) {
                  sprintf(p, "%ld ", dev->drv[i]->online);
                  p = istatbuf + strlen(istatbuf);
            } else {
                  sprintf(p, "? ");
                  p = istatbuf + strlen(istatbuf);
            }
      }
      sprintf(p, "\nphone:\t");
      p = istatbuf + strlen(istatbuf);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            sprintf(p, "%s ", dev->num[i]);
            p = istatbuf + strlen(istatbuf);
      }
      sprintf(p, "\n");
      return istatbuf;
}

/* Module interface-code */

void
isdn_info_update(void)
{
      infostruct *p = dev->infochain;

      while (p) {
            *(p->private) = 1;
            p = (infostruct *) p->next;
      }
      wake_up_interruptible(&(dev->info_waitq));
}

static ssize_t
isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
{
      uint minor = iminor(file->f_path.dentry->d_inode);
      int len = 0;
      int drvidx;
      int chidx;
      int retval;
      char *p;

      lock_kernel();
      if (minor == ISDN_MINOR_STATUS) {
            if (!file->private_data) {
                  if (file->f_flags & O_NONBLOCK) {
                        retval = -EAGAIN;
                        goto out;
                  }
                  interruptible_sleep_on(&(dev->info_waitq));
            }
            p = isdn_statstr();
            file->private_data = NULL;
            if ((len = strlen(p)) <= count) {
                  if (copy_to_user(buf, p, len)) {
                        retval = -EFAULT;
                        goto out;
                  }
                  *off += len;
                  retval = len;
                  goto out;
            }
            retval = 0;
            goto out;
      }
      if (!dev->drivers) {
            retval = -ENODEV;
            goto out;
      }
      if (minor <= ISDN_MINOR_BMAX) {
            printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
            drvidx = isdn_minor2drv(minor);
            if (drvidx < 0) {
                  retval = -ENODEV;
                  goto out;
            }
            if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
                  retval = -ENODEV;
                  goto out;
            }
            chidx = isdn_minor2chan(minor);
            if (!(p = kmalloc(count, GFP_KERNEL))) {
                  retval = -ENOMEM;
                  goto out;
            }
            len = isdn_readbchan(drvidx, chidx, p, NULL, count,
                             &dev->drv[drvidx]->rcv_waitq[chidx]);
            *off += len;
            if (copy_to_user(buf,p,len)) 
                  len = -EFAULT;
            kfree(p);
            retval = len;
            goto out;
      }
      if (minor <= ISDN_MINOR_CTRLMAX) {
            drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
            if (drvidx < 0) {
                  retval = -ENODEV;
                  goto out;
            }
            if (!dev->drv[drvidx]->stavail) {
                  if (file->f_flags & O_NONBLOCK) {
                        retval = -EAGAIN;
                        goto out;
                  }
                  interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
            }
            if (dev->drv[drvidx]->interface->readstat) {
                  if (count > dev->drv[drvidx]->stavail)
                        count = dev->drv[drvidx]->stavail;
                  len = dev->drv[drvidx]->interface->readstat(buf, count,
                        drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
                  if (len < 0) {
                        retval = len;
                        goto out;
                  }
            } else {
                  len = 0;
            }
            if (len)
                  dev->drv[drvidx]->stavail -= len;
            else
                  dev->drv[drvidx]->stavail = 0;
            *off += len;
            retval = len;
            goto out;
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX) {
            retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
            goto out;
      }
#endif
      retval = -ENODEV;
 out:
      unlock_kernel();
      return retval;
}

static ssize_t
isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
{
      uint minor = iminor(file->f_path.dentry->d_inode);
      int drvidx;
      int chidx;
      int retval;

      if (minor == ISDN_MINOR_STATUS)
            return -EPERM;
      if (!dev->drivers)
            return -ENODEV;

      lock_kernel();
      if (minor <= ISDN_MINOR_BMAX) {
            printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
            drvidx = isdn_minor2drv(minor);
            if (drvidx < 0) {
                  retval = -ENODEV;
                  goto out;
            }
            if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
                  retval = -ENODEV;
                  goto out;
            }
            chidx = isdn_minor2chan(minor);
            while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
                  interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
            goto out;
      }
      if (minor <= ISDN_MINOR_CTRLMAX) {
            drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
            if (drvidx < 0) {
                  retval = -ENODEV;
                  goto out;
            }
            /*
             * We want to use the isdnctrl device to load the firmware
             *
             if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
             return -ENODEV;
             */
            if (dev->drv[drvidx]->interface->writecmd)
                  retval = dev->drv[drvidx]->interface->
                        writecmd(buf, count, drvidx,
                        isdn_minor2chan(minor - ISDN_MINOR_CTRL));
            else
                  retval = count;
            goto out;
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX) {
            retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
            goto out;
      }
#endif
      retval = -ENODEV;
 out:
      unlock_kernel();
      return retval;
}

static unsigned int
isdn_poll(struct file *file, poll_table * wait)
{
      unsigned int mask = 0;
      unsigned int minor = iminor(file->f_path.dentry->d_inode);
      int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);

      lock_kernel();
      if (minor == ISDN_MINOR_STATUS) {
            poll_wait(file, &(dev->info_waitq), wait);
            /* mask = POLLOUT | POLLWRNORM; */
            if (file->private_data) {
                  mask |= POLLIN | POLLRDNORM;
            }
            goto out;
      }
      if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
            if (drvidx < 0) {
                  /* driver deregistered while file open */
                  mask = POLLHUP;
                  goto out;
            }
            poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
            mask = POLLOUT | POLLWRNORM;
            if (dev->drv[drvidx]->stavail) {
                  mask |= POLLIN | POLLRDNORM;
            }
            goto out;
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX) {
            mask = isdn_ppp_poll(file, wait);
            goto out;
      }
#endif
      mask = POLLERR;
 out:
      unlock_kernel();
      return mask;
}


static int
isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
{
      uint minor = iminor(inode);
      isdn_ctrl c;
      int drvidx;
      int chidx;
      int ret;
      int i;
      char __user *p;
      char *s;
      union iocpar {
            char name[10];
            char bname[22];
            isdn_ioctl_struct iocts;
            isdn_net_ioctl_phone phone;
            isdn_net_ioctl_cfg cfg;
      } iocpar;
      void __user *argp = (void __user *)arg;

#define name  iocpar.name
#define bname iocpar.bname
#define iocts iocpar.iocts
#define phone iocpar.phone
#define cfg   iocpar.cfg

      if (minor == ISDN_MINOR_STATUS) {
            switch (cmd) {
                  case IIOCGETDVR:
                        return (TTY_DV +
                              (NET_DV << 8) +
                              (INF_DV << 16));
                  case IIOCGETCPS:
                        if (arg) {
                              ulong __user *p = argp;
                              int i;
                              if (!access_ok(VERIFY_WRITE, p,
                                          sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
                                    return -EFAULT;
                              for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                    put_user(dev->ibytes[i], p++);
                                    put_user(dev->obytes[i], p++);
                              }
                              return 0;
                        } else
                              return -EINVAL;
                        break;
#ifdef CONFIG_NETDEVICES
                  case IIOCNETGPN:
                        /* Get peer phone number of a connected 
                         * isdn network interface */
                        if (arg) {
                              if (copy_from_user(&phone, argp, sizeof(phone)))
                                    return -EFAULT;
                              return isdn_net_getpeer(&phone, argp);
                        } else
                              return -EINVAL;
#endif
                  default:
                        return -EINVAL;
            }
      }
      if (!dev->drivers)
            return -ENODEV;
      if (minor <= ISDN_MINOR_BMAX) {
            drvidx = isdn_minor2drv(minor);
            if (drvidx < 0)
                  return -ENODEV;
            chidx = isdn_minor2chan(minor);
            if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
                  return -ENODEV;
            return 0;
      }
      if (minor <= ISDN_MINOR_CTRLMAX) {
/*
 * isdn net devices manage lots of configuration variables as linked lists.
 * Those lists must only be manipulated from user space. Some of the ioctl's
 * service routines access user space and are not atomic. Therefor, ioctl's
 * manipulating the lists and ioctl's sleeping while accessing the lists
 * are serialized by means of a semaphore.
 */
            switch (cmd) {
                  case IIOCNETDWRSET:
                        printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
                        return(-EINVAL);
                  case IIOCNETLCR:
                        printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
                        return -ENODEV;
#ifdef CONFIG_NETDEVICES
                  case IIOCNETAIF:
                        /* Add a network-interface */
                        if (arg) {
                              if (copy_from_user(name, argp, sizeof(name)))
                                    return -EFAULT;
                              s = name;
                        } else {
                              s = NULL;
                        }
                        ret = mutex_lock_interruptible(&dev->mtx);
                        if( ret ) return ret;
                        if ((s = isdn_net_new(s, NULL))) {
                              if (copy_to_user(argp, s, strlen(s) + 1)){
                                    ret = -EFAULT;
                              } else {
                                    ret = 0;
                              }
                        } else
                              ret = -ENODEV;
                        mutex_unlock(&dev->mtx);
                        return ret;
                  case IIOCNETASL:
                        /* Add a slave to a network-interface */
                        if (arg) {
                              if (copy_from_user(bname, argp, sizeof(bname) - 1))
                                    return -EFAULT;
                        } else
                              return -EINVAL;
                        ret = mutex_lock_interruptible(&dev->mtx);
                        if( ret ) return ret;
                        if ((s = isdn_net_newslave(bname))) {
                              if (copy_to_user(argp, s, strlen(s) + 1)){
                                    ret = -EFAULT;
                              } else {
                                    ret = 0;
                              }
                        } else
                              ret = -ENODEV;
                        mutex_unlock(&dev->mtx);
                        return ret;
                  case IIOCNETDIF:
                        /* Delete a network-interface */
                        if (arg) {
                              if (copy_from_user(name, argp, sizeof(name)))
                                    return -EFAULT;
                              ret = mutex_lock_interruptible(&dev->mtx);
                              if( ret ) return ret;
                              ret = isdn_net_rm(name);
                              mutex_unlock(&dev->mtx);
                              return ret;
                        } else
                              return -EINVAL;
                  case IIOCNETSCF:
                        /* Set configurable parameters of a network-interface */
                        if (arg) {
                              if (copy_from_user(&cfg, argp, sizeof(cfg)))
                                    return -EFAULT;
                              return isdn_net_setcfg(&cfg);
                        } else
                              return -EINVAL;
                  case IIOCNETGCF:
                        /* Get configurable parameters of a network-interface */
                        if (arg) {
                              if (copy_from_user(&cfg, argp, sizeof(cfg)))
                                    return -EFAULT;
                              if (!(ret = isdn_net_getcfg(&cfg))) {
                                    if (copy_to_user(argp, &cfg, sizeof(cfg)))
                                          return -EFAULT;
                              }
                              return ret;
                        } else
                              return -EINVAL;
                  case IIOCNETANM:
                        /* Add a phone-number to a network-interface */
                        if (arg) {
                              if (copy_from_user(&phone, argp, sizeof(phone)))
                                    return -EFAULT;
                              ret = mutex_lock_interruptible(&dev->mtx);
                              if( ret ) return ret;
                              ret = isdn_net_addphone(&phone);
                              mutex_unlock(&dev->mtx);
                              return ret;
                        } else
                              return -EINVAL;
                  case IIOCNETGNM:
                        /* Get list of phone-numbers of a network-interface */
                        if (arg) {
                              if (copy_from_user(&phone, argp, sizeof(phone)))
                                    return -EFAULT;
                              ret = mutex_lock_interruptible(&dev->mtx);
                              if( ret ) return ret;
                              ret = isdn_net_getphones(&phone, argp);
                              mutex_unlock(&dev->mtx);
                              return ret;
                        } else
                              return -EINVAL;
                  case IIOCNETDNM:
                        /* Delete a phone-number of a network-interface */
                        if (arg) {
                              if (copy_from_user(&phone, argp, sizeof(phone)))
                                    return -EFAULT;
                              ret = mutex_lock_interruptible(&dev->mtx);
                              if( ret ) return ret;
                              ret = isdn_net_delphone(&phone);
                              mutex_unlock(&dev->mtx);
                              return ret;
                        } else
                              return -EINVAL;
                  case IIOCNETDIL:
                        /* Force dialing of a network-interface */
                        if (arg) {
                              if (copy_from_user(name, argp, sizeof(name)))
                                    return -EFAULT;
                              return isdn_net_force_dial(name);
                        } else
                              return -EINVAL;
#ifdef CONFIG_ISDN_PPP
                  case IIOCNETALN:
                        if (!arg)
                              return -EINVAL;
                        if (copy_from_user(name, argp, sizeof(name)))
                              return -EFAULT;
                        return isdn_ppp_dial_slave(name);
                  case IIOCNETDLN:
                        if (!arg)
                              return -EINVAL;
                        if (copy_from_user(name, argp, sizeof(name)))
                              return -EFAULT;
                        return isdn_ppp_hangup_slave(name);
#endif
                  case IIOCNETHUP:
                        /* Force hangup of a network-interface */
                        if (!arg)
                              return -EINVAL;
                        if (copy_from_user(name, argp, sizeof(name)))
                              return -EFAULT;
                        return isdn_net_force_hangup(name);
                        break;
#endif                          /* CONFIG_NETDEVICES */
                  case IIOCSETVER:
                        dev->net_verbose = arg;
                        printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
                        return 0;
                  case IIOCSETGST:
                        if (arg)
                              dev->global_flags |= ISDN_GLOBAL_STOPPED;
                        else
                              dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
                        printk(KERN_INFO "isdn: Global Mode %s\n",
                               (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
                        return 0;
                  case IIOCSETBRJ:
                        drvidx = -1;
                        if (arg) {
                              int i;
                              char *p;
                              if (copy_from_user(&iocts, argp,
                                   sizeof(isdn_ioctl_struct)))
                                    return -EFAULT;
                              iocts.drvid[sizeof(iocts.drvid)-1] = 0;
                              if (strlen(iocts.drvid)) {
                                    if ((p = strchr(iocts.drvid, ',')))
                                          *p = 0;
                                    drvidx = -1;
                                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                                          if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                                                drvidx = i;
                                                break;
                                          }
                              }
                        }
                        if (drvidx == -1)
                              return -ENODEV;
                        if (iocts.arg)
                              dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
                        else
                              dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
                        return 0;
                  case IIOCSIGPRF:
                        dev->profd = current;
                        return 0;
                        break;
                  case IIOCGETPRF:
                        /* Get all Modem-Profiles */
                        if (arg) {
                              char __user *p = argp;
                              int i;

                              if (!access_ok(VERIFY_WRITE, argp,
                              (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
                                       * ISDN_MAX_CHANNELS))
                                    return -EFAULT;

                              for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                    if (copy_to_user(p, dev->mdm.info[i].emu.profile,
                                          ISDN_MODEM_NUMREG))
                                          return -EFAULT;
                                    p += ISDN_MODEM_NUMREG;
                                    if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
                                          return -EFAULT;
                                    p += ISDN_MSNLEN;
                                    if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
                                          return -EFAULT;
                                    p += ISDN_LMSNLEN;
                              }
                              return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
                        } else
                              return -EINVAL;
                        break;
                  case IIOCSETPRF:
                        /* Set all Modem-Profiles */
                        if (arg) {
                              char __user *p = argp;
                              int i;

                              if (!access_ok(VERIFY_READ, argp,
                              (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
                                       * ISDN_MAX_CHANNELS))
                                    return -EFAULT;

                              for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                                    if (copy_from_user(dev->mdm.info[i].emu.profile, p,
                                         ISDN_MODEM_NUMREG))
                                          return -EFAULT;
                                    p += ISDN_MODEM_NUMREG;
                                    if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
                                          return -EFAULT;
                                    p += ISDN_LMSNLEN;
                                    if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
                                          return -EFAULT;
                                    p += ISDN_MSNLEN;
                              }
                              return 0;
                        } else
                              return -EINVAL;
                        break;
                  case IIOCSETMAP:
                  case IIOCGETMAP:
                        /* Set/Get MSN->EAZ-Mapping for a driver */
                        if (arg) {

                              if (copy_from_user(&iocts, argp,
                                   sizeof(isdn_ioctl_struct)))
                                    return -EFAULT;
                              iocts.drvid[sizeof(iocts.drvid)-1] = 0;
                              if (strlen(iocts.drvid)) {
                                    drvidx = -1;
                                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                                          if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                                                drvidx = i;
                                                break;
                                          }
                              } else
                                    drvidx = 0;
                              if (drvidx == -1)
                                    return -ENODEV;
                              if (cmd == IIOCSETMAP) {
                                    int loop = 1;

                                    p = (char __user *) iocts.arg;
                                    i = 0;
                                    while (loop) {
                                          int j = 0;

                                          while (1) {
                                                if (!access_ok(VERIFY_READ, p, 1))
                                                      return -EFAULT;
                                                get_user(bname[j], p++);
                                                switch (bname[j]) {
                                                      case '\0':
                                                            loop = 0;
                                                            /* Fall through */
                                                      case ',':
                                                            bname[j] = '\0';
                                                            strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
                                                            j = ISDN_MSNLEN;
                                                            break;
                                                      default:
                                                            j++;
                                                }
                                                if (j >= ISDN_MSNLEN)
                                                      break;
                                          }
                                          if (++i > 9)
                                                break;
                                    }
                              } else {
                                    p = (char __user *) iocts.arg;
                                    for (i = 0; i < 10; i++) {
                                          snprintf(bname, sizeof(bname), "%s%s",
                                                strlen(dev->drv[drvidx]->msn2eaz[i]) ?
                                                dev->drv[drvidx]->msn2eaz[i] : "_",
                                                (i < 9) ? "," : "\0");
                                          if (copy_to_user(p, bname, strlen(bname) + 1))
                                                return -EFAULT;
                                          p += strlen(bname);
                                    }
                              }
                              return 0;
                        } else
                              return -EINVAL;
                  case IIOCDBGVAR:
                        if (arg) {
                              if (copy_to_user(argp, &dev, sizeof(ulong)))
                                    return -EFAULT;
                              return 0;
                        } else
                              return -EINVAL;
                        break;
                  default:
                        if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
                              cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
                        else
                              return -EINVAL;
                        if (arg) {
                              int i;
                              char *p;
                              if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
                                    return -EFAULT;
                              iocts.drvid[sizeof(iocts.drvid)-1] = 0;
                              if (strlen(iocts.drvid)) {
                                    if ((p = strchr(iocts.drvid, ',')))
                                          *p = 0;
                                    drvidx = -1;
                                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                                          if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                                                drvidx = i;
                                                break;
                                          }
                              } else
                                    drvidx = 0;
                              if (drvidx == -1)
                                    return -ENODEV;
                              if (!access_ok(VERIFY_WRITE, argp,
                                   sizeof(isdn_ioctl_struct)))
                                    return -EFAULT;
                              c.driver = drvidx;
                              c.command = ISDN_CMD_IOCTL;
                              c.arg = cmd;
                              memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
                              ret = isdn_command(&c);
                              memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
                              if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
                                    return -EFAULT;
                              return ret;
                        } else
                              return -EINVAL;
            }
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX)
            return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
#endif
      return -ENODEV;

#undef name
#undef bname
#undef iocts
#undef phone
#undef cfg
}

/*
 * Open the device code.
 */
static int
isdn_open(struct inode *ino, struct file *filep)
{
      uint minor = iminor(ino);
      int drvidx;
      int chidx;
      int retval = -ENODEV;


      if (minor == ISDN_MINOR_STATUS) {
            infostruct *p;

            if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
                  p->next = (char *) dev->infochain;
                  p->private = (char *) &(filep->private_data);
                  dev->infochain = p;
                  /* At opening we allow a single update */
                  filep->private_data = (char *) 1;
                  retval = 0;
                  goto out;
            } else {
                  retval = -ENOMEM;
                  goto out;
            }
      }
      if (!dev->channels)
            goto out;
      if (minor <= ISDN_MINOR_BMAX) {
            printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
            drvidx = isdn_minor2drv(minor);
            if (drvidx < 0)
                  goto out;
            chidx = isdn_minor2chan(minor);
            if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
                  goto out;
            if (!(dev->drv[drvidx]->online & (1 << chidx)))
                  goto out;
            isdn_lock_drivers();
            retval = 0;
            goto out;
      }
      if (minor <= ISDN_MINOR_CTRLMAX) {
            drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
            if (drvidx < 0)
                  goto out;
            isdn_lock_drivers();
            retval = 0;
            goto out;
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX) {
            retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
            if (retval == 0)
                  isdn_lock_drivers();
            goto out;
      }
#endif
 out:
      nonseekable_open(ino, filep);
      return retval;
}

static int
isdn_close(struct inode *ino, struct file *filep)
{
      uint minor = iminor(ino);

      lock_kernel();
      if (minor == ISDN_MINOR_STATUS) {
            infostruct *p = dev->infochain;
            infostruct *q = NULL;

            while (p) {
                  if (p->private == (char *) &(filep->private_data)) {
                        if (q)
                              q->next = p->next;
                        else
                              dev->infochain = (infostruct *) (p->next);
                        kfree(p);
                        goto out;
                  }
                  q = p;
                  p = (infostruct *) (p->next);
            }
            printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
            goto out;
      }
      isdn_unlock_drivers();
      if (minor <= ISDN_MINOR_BMAX)
            goto out;
      if (minor <= ISDN_MINOR_CTRLMAX) {
            if (dev->profd == current)
                  dev->profd = NULL;
            goto out;
      }
#ifdef CONFIG_ISDN_PPP
      if (minor <= ISDN_MINOR_PPPMAX)
            isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
#endif

 out:
      unlock_kernel();
      return 0;
}

static const struct file_operations isdn_fops =
{
      .owner            = THIS_MODULE,
      .llseek           = no_llseek,
      .read       = isdn_read,
      .write            = isdn_write,
      .poll       = isdn_poll,
      .ioctl            = isdn_ioctl,
      .open       = isdn_open,
      .release    = isdn_close,
};

char *
isdn_map_eaz2msn(char *msn, int di)
{
      isdn_driver_t *this = dev->drv[di];
      int i;

      if (strlen(msn) == 1) {
            i = msn[0] - '0';
            if ((i >= 0) && (i <= 9))
                  if (strlen(this->msn2eaz[i]))
                        return (this->msn2eaz[i]);
      }
      return (msn);
}

/*
 * Find an unused ISDN-channel, whose feature-flags match the
 * given L2- and L3-protocols.
 */
#define L2V (~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038))

/*
 * This function must be called with holding the dev->lock.
 */
int
isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
                  ,int pre_chan, char *msn)
{
      int i;
      ulong features;
      ulong vfeatures;

      features = ((1 << l2_proto) | (0x10000 << l3_proto));
      vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
                 ~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038));
      /* If Layer-2 protocol is V.110, accept drivers with
       * transparent feature even if these don't support V.110
       * because we can emulate this in linklevel.
       */
      for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if (USG_NONE(dev->usage[i]) &&
                (dev->drvmap[i] != -1)) {
                  int d = dev->drvmap[i];
                  if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
                  ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
                        continue;
                  if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
                        continue;
                  if (dev->usage[i] & ISDN_USAGE_DISABLED)
                          continue; /* usage not allowed */
                  if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
                        if (((dev->drv[d]->interface->features & features) == features) ||
                            (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
                             (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
                              if ((pre_dev < 0) || (pre_chan < 0)) {
                                    dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
                                    dev->usage[i] |= usage;
                                    isdn_info_update();
                                    return i;
                              } else {
                                    if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
                                          dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
                                          dev->usage[i] |= usage;
                                          isdn_info_update();
                                          return i;
                                    }
                              }
                        }
                  }
            }
      return -1;
}

/*
 * Set state of ISDN-channel to 'unused'
 */
void
isdn_free_channel(int di, int ch, int usage)
{
      int i;

      if ((di < 0) || (ch < 0)) {
            printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
                  __FUNCTION__, di, ch);
            return;
      }
      for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
                (dev->drvmap[i] == di) &&
                (dev->chanmap[i] == ch)) {
                  dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
                  strcpy(dev->num[i], "???");
                  dev->ibytes[i] = 0;
                  dev->obytes[i] = 0;
// 20.10.99 JIM, try to reinitialize v110 !
                  dev->v110emu[i] = 0;
                  atomic_set(&(dev->v110use[i]), 0);
                  isdn_v110_close(dev->v110[i]);
                  dev->v110[i] = NULL;
// 20.10.99 JIM, try to reinitialize v110 !
                  isdn_info_update();
                  if (dev->drv[di])
                        skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
            }
}

/*
 * Cancel Exclusive-Flag for ISDN-channel
 */
void
isdn_unexclusive_channel(int di, int ch)
{
      int i;

      for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if ((dev->drvmap[i] == di) &&
                (dev->chanmap[i] == ch)) {
                  dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
                  isdn_info_update();
                  return;
            }
}

/*
 *  writebuf replacement for SKB_ABLE drivers
 */
static int
isdn_writebuf_stub(int drvidx, int chan, const u_char __user * buf, int len)
{
      int ret;
      int hl = dev->drv[drvidx]->interface->hl_hdrlen;
      struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);

      if (!skb)
            return -ENOMEM;
      skb_reserve(skb, hl);
      if (copy_from_user(skb_put(skb, len), buf, len))
            return -EFAULT;
      ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
      if (ret <= 0)
            dev_kfree_skb(skb);
      if (ret > 0)
            dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
      return ret;
}

/*
 * Return: length of data on success, -ERRcode on failure.
 */
int
isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
{
      int ret;
      struct sk_buff *nskb = NULL;
      int v110_ret = skb->len;
      int idx = isdn_dc2minor(drvidx, chan);

      if (dev->v110[idx]) {
            atomic_inc(&dev->v110use[idx]);
            nskb = isdn_v110_encode(dev->v110[idx], skb);
            atomic_dec(&dev->v110use[idx]);
            if (!nskb)
                  return 0;
            v110_ret = *((int *)nskb->data);
            skb_pull(nskb, sizeof(int));
            if (!nskb->len) {
                  dev_kfree_skb(nskb);
                  return v110_ret;
            }
            /* V.110 must always be acknowledged */
            ack = 1;
            ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
      } else {
            int hl = dev->drv[drvidx]->interface->hl_hdrlen;

            if( skb_headroom(skb) < hl ){
                  /* 
                   * This should only occur when new HL driver with
                   * increased hl_hdrlen was loaded after netdevice
                   * was created and connected to the new driver.
                   *
                   * The V.110 branch (re-allocates on its own) does
                   * not need this
                   */
                  struct sk_buff * skb_tmp;

                  skb_tmp = skb_realloc_headroom(skb, hl);
                  printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
                  if (!skb_tmp) return -ENOMEM; /* 0 better? */
                  ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
                  if( ret > 0 ){
                        dev_kfree_skb(skb);
                  } else {
                        dev_kfree_skb(skb_tmp);
                  }
            } else {
                  ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
            }
      }
      if (ret > 0) {
            dev->obytes[idx] += ret;
            if (dev->v110[idx]) {
                  atomic_inc(&dev->v110use[idx]);
                  dev->v110[idx]->skbuser++;
                  atomic_dec(&dev->v110use[idx]);
                  /* For V.110 return unencoded data length */
                  ret = v110_ret;
                  /* if the complete frame was send we free the skb;
                     if not upper function will requeue the skb */ 
                  if (ret == skb->len)
                        dev_kfree_skb(skb);
            }
      } else
            if (dev->v110[idx])
                  dev_kfree_skb(nskb);
      return ret;
}

static int
isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
{
      int j, k, m;

      init_waitqueue_head(&d->st_waitq);
      if (d->flags & DRV_FLAG_RUNNING)
            return -1;
            if (n < 1) return 0;

      m = (adding) ? d->channels + n : n;

      if (dev->channels + n > ISDN_MAX_CHANNELS) {
            printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
                   ISDN_MAX_CHANNELS);
            return -1;
      }

      if ((adding) && (d->rcverr))
            kfree(d->rcverr);
      if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
            printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
            return -1;
      }

      if ((adding) && (d->rcvcount))
            kfree(d->rcvcount);
      if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
            printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
            if (!adding)
                  kfree(d->rcverr);
            return -1;
      }

      if ((adding) && (d->rpqueue)) {
            for (j = 0; j < d->channels; j++)
                  skb_queue_purge(&d->rpqueue[j]);
            kfree(d->rpqueue);
      }
      if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
            printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
            if (!adding) {
                  kfree(d->rcvcount);
                  kfree(d->rcverr);
            }
            return -1; 
      }
      for (j = 0; j < m; j++) {
            skb_queue_head_init(&d->rpqueue[j]);
      }

      if ((adding) && (d->rcv_waitq))
            kfree(d->rcv_waitq);
      d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
      if (!d->rcv_waitq) {
            printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
            if (!adding) {
                  kfree(d->rpqueue);
                  kfree(d->rcvcount);
                  kfree(d->rcverr);
            }
            return -1;
      }
      d->snd_waitq = d->rcv_waitq + m;
      for (j = 0; j < m; j++) {
            init_waitqueue_head(&d->rcv_waitq[j]);
            init_waitqueue_head(&d->snd_waitq[j]);
      }

      dev->channels += n;
      for (j = d->channels; j < m; j++)
            for (k = 0; k < ISDN_MAX_CHANNELS; k++)
                  if (dev->chanmap[k] < 0) {
                        dev->chanmap[k] = j;
                        dev->drvmap[k] = drvidx;
                        break;
                  }
      d->channels = m;
      return 0;
}

/*
 * Low-level-driver registration
 */

static void
set_global_features(void)
{
      int drvidx;

      dev->global_features = 0;
      for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
            if (!dev->drv[drvidx])
                  continue;
            if (dev->drv[drvidx]->interface)
                  dev->global_features |= dev->drv[drvidx]->interface->features;
      }
}

#ifdef CONFIG_ISDN_DIVERSION

static char *map_drvname(int di)
{
  if ((di < 0) || (di >= ISDN_MAX_DRIVERS)) 
    return(NULL);
  return(dev->drvid[di]); /* driver name */
} /* map_drvname */

static int map_namedrv(char *id)
{  int i;

   for (i = 0; i < ISDN_MAX_DRIVERS; i++)
    { if (!strcmp(dev->drvid[i],id)) 
        return(i);
    }
   return(-1);
} /* map_namedrv */

int DIVERT_REG_NAME(isdn_divert_if *i_div)
{
  if (i_div->if_magic != DIVERT_IF_MAGIC) 
    return(DIVERT_VER_ERR);
  switch (i_div->cmd)
    {
      case DIVERT_CMD_REL:
        if (divert_if != i_div) 
          return(DIVERT_REL_ERR);
        divert_if = NULL; /* free interface */
        return(DIVERT_NO_ERR);

      case DIVERT_CMD_REG:
        if (divert_if) 
          return(DIVERT_REG_ERR);
        i_div->ll_cmd = isdn_command; /* set command function */
        i_div->drv_to_name = map_drvname; 
        i_div->name_to_drv = map_namedrv; 
        divert_if = i_div; /* remember interface */
        return(DIVERT_NO_ERR);

      default:
        return(DIVERT_CMD_ERR);   
    }
} /* DIVERT_REG_NAME */

EXPORT_SYMBOL(DIVERT_REG_NAME);

#endif /* CONFIG_ISDN_DIVERSION */


EXPORT_SYMBOL(register_isdn);
#ifdef CONFIG_ISDN_PPP
EXPORT_SYMBOL(isdn_ppp_register_compressor);
EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
#endif

int
register_isdn(isdn_if * i)
{
      isdn_driver_t *d;
      int j;
      ulong flags;
      int drvidx;

      if (dev->drivers >= ISDN_MAX_DRIVERS) {
            printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
                   ISDN_MAX_DRIVERS);
            return 0;
      }
      if (!i->writebuf_skb) {
            printk(KERN_WARNING "register_isdn: No write routine given.\n");
            return 0;
      }
      if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
            printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
            return 0;
      }

      d->maxbufsize = i->maxbufsize;
      d->pktcount = 0;
      d->stavail = 0;
      d->flags = DRV_FLAG_LOADED;
      d->online = 0;
      d->interface = i;
      d->channels = 0;
      spin_lock_irqsave(&dev->lock, flags);
      for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
            if (!dev->drv[drvidx])
                  break;
      if (isdn_add_channels(d, drvidx, i->channels, 0)) {
            spin_unlock_irqrestore(&dev->lock, flags);
            kfree(d);
            return 0;
      }
      i->channels = drvidx;
      i->rcvcallb_skb = isdn_receive_skb_callback;
      i->statcallb = isdn_status_callback;
      if (!strlen(i->id))
            sprintf(i->id, "line%d", drvidx);
      for (j = 0; j < drvidx; j++)
            if (!strcmp(i->id, dev->drvid[j]))
                  sprintf(i->id, "line%d", drvidx);
      dev->drv[drvidx] = d;
      strcpy(dev->drvid[drvidx], i->id);
      isdn_info_update();
      dev->drivers++;
      set_global_features();
      spin_unlock_irqrestore(&dev->lock, flags);
      return 1;
}

/*
 *****************************************************************************
 * And now the modules code.
 *****************************************************************************
 */

static char *
isdn_getrev(const char *revision)
{
      char *rev;
      char *p;

      if ((p = strchr(revision, ':'))) {
            rev = p + 2;
            p = strchr(rev, '$');
            *--p = 0;
      } else
            rev = "???";
      return rev;
}

/*
 * Allocate and initialize all data, register modem-devices
 */
static int __init isdn_init(void)
{
      int i;
      char tmprev[50];

      if (!(dev = vmalloc(sizeof(isdn_dev)))) {
            printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
            return -EIO;
      }
      memset((char *) dev, 0, sizeof(isdn_dev));
      init_timer(&dev->timer);
      dev->timer.function = isdn_timer_funct;
      spin_lock_init(&dev->lock);
      spin_lock_init(&dev->timerlock);
#ifdef MODULE
      dev->owner = THIS_MODULE;
#endif
      mutex_init(&dev->mtx);
      init_waitqueue_head(&dev->info_waitq);
      for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
            dev->drvmap[i] = -1;
            dev->chanmap[i] = -1;
            dev->m_idx[i] = -1;
            strcpy(dev->num[i], "???");
            init_waitqueue_head(&dev->mdm.info[i].open_wait);
            init_waitqueue_head(&dev->mdm.info[i].close_wait);
      }
      if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
            printk(KERN_WARNING "isdn: Could not register control devices\n");
            vfree(dev);
            return -EIO;
      }
      if ((isdn_tty_modem_init()) < 0) {
            printk(KERN_WARNING "isdn: Could not register tty devices\n");
            vfree(dev);
            unregister_chrdev(ISDN_MAJOR, "isdn");
            return -EIO;
      }
#ifdef CONFIG_ISDN_PPP
      if (isdn_ppp_init() < 0) {
            printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
            isdn_tty_exit();
            unregister_chrdev(ISDN_MAJOR, "isdn");
            vfree(dev);
            return -EIO;
      }
#endif                          /* CONFIG_ISDN_PPP */

      strcpy(tmprev, isdn_revision);
      printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
      strcpy(tmprev, isdn_tty_revision);
      printk("%s/", isdn_getrev(tmprev));
      strcpy(tmprev, isdn_net_revision);
      printk("%s/", isdn_getrev(tmprev));
      strcpy(tmprev, isdn_ppp_revision);
      printk("%s/", isdn_getrev(tmprev));
      strcpy(tmprev, isdn_audio_revision);
      printk("%s/", isdn_getrev(tmprev));
      strcpy(tmprev, isdn_v110_revision);
      printk("%s", isdn_getrev(tmprev));

#ifdef MODULE
      printk(" loaded\n");
#else
      printk("\n");
#endif
      isdn_info_update();
      return 0;
}

/*
 * Unload module
 */
static void __exit isdn_exit(void)
{
#ifdef CONFIG_ISDN_PPP
      isdn_ppp_cleanup();
#endif
      if (isdn_net_rmall() < 0) {
            printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
            return;
      }
      isdn_tty_exit();
      unregister_chrdev(ISDN_MAJOR, "isdn");
      del_timer(&dev->timer);
      /* call vfree with interrupts enabled, else it will hang */
      vfree(dev);
      printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
}

module_init(isdn_init);
module_exit(isdn_exit);

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