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   1 /* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
   2  *
   3  * Linux ISDN subsystem, common used functions (linklevel).
   4  *
   5  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   6  * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/isdn.h>
  19 #include <linux/smp_lock.h>
  20 #include "isdn_common.h"
  21 #include "isdn_tty.h"
  22 #include "isdn_net.h"
  23 #include "isdn_ppp.h"
  24 #ifdef CONFIG_ISDN_AUDIO
  25 #include "isdn_audio.h"
  26 #endif
  27 #ifdef CONFIG_ISDN_DIVERSION_MODULE
  28 #define CONFIG_ISDN_DIVERSION
  29 #endif
  30 #ifdef CONFIG_ISDN_DIVERSION
  31 #include <linux/isdn_divertif.h>
  32 #endif /* CONFIG_ISDN_DIVERSION */
  33 #include "isdn_v110.h"
  34
  35 /* Debugflags */
  36 #undef ISDN_DEBUG_STATCALLB
  37
  38 MODULE_DESCRIPTION("ISDN4Linux: link layer");
  39 MODULE_AUTHOR("Fritz Elfert");
  40 MODULE_LICENSE("GPL");
  41
  42 isdn_dev *dev;
  43
  44 static char *isdn_revision = "$Revision: 1.1.2.3 $";
  45
  46 extern char *isdn_net_revision;
  47 extern char *isdn_tty_revision;
  48 #ifdef CONFIG_ISDN_PPP
  49 extern char *isdn_ppp_revision;
  50 #else
  51 static char *isdn_ppp_revision = ": none $";
  52 #endif
  53 #ifdef CONFIG_ISDN_AUDIO
  54 extern char *isdn_audio_revision;
  55 #else
  56 static char *isdn_audio_revision = ": none $";
  57 #endif
  58 extern char *isdn_v110_revision;
  59
  60 #ifdef CONFIG_ISDN_DIVERSION
  61 static isdn_divert_if *divert_if; /* = NULL */
  62 #endif /* CONFIG_ISDN_DIVERSION */
  63
  64
  65 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
  66 static void set_global_features(void);
  67 static int isdn_wildmat(char *s, char *p);
  68 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
  69
  70 static inline void
  71 isdn_lock_driver(isdn_driver_t *drv)
  72 {
  73         try_module_get(drv->interface->owner);
  74         drv->locks++;
  75 }
  76
  77 void
  78 isdn_lock_drivers(void)
  79 {
  80         int i;
  81
  82         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
  83                 if (!dev->drv[i])
  84                         continue;
  85                 isdn_lock_driver(dev->drv[i]);
  86         }
  87 }
  88
  89 static inline void
  90 isdn_unlock_driver(isdn_driver_t *drv)
  91 {
  92         if (drv->locks > 0) {
  93                 drv->locks--;
  94                 module_put(drv->interface->owner);
  95         }
  96 }
  97
  98 void
  99 isdn_unlock_drivers(void)
 100 {
 101         int i;
 102
 103         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
 104                 if (!dev->drv[i])
 105                         continue;
 106                 isdn_unlock_driver(dev->drv[i]);
 107         }
 108 }
 109
 110 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
 111 void
 112 isdn_dumppkt(char *s, u_char * p, int len, int dumplen)
 113 {
 114         int dumpc;
 115
 116         printk(KERN_DEBUG "%s(%d) ", s, len);
 117         for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
 118                 printk(" %02x", *p++);
 119         printk("\n");
 120 }
 121 #endif
 122
 123 /*
 124  * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 125  * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
 126  */
 127 static int
 128 isdn_star(char *s, char *p)
 129 {
 130         while (isdn_wildmat(s, p)) {
 131                 if (*++s == '\0')
 132                         return (2);
 133         }
 134         return (0);
 135 }
 136
 137 /*
 138  * Shell-type Pattern-matching for incoming caller-Ids
 139  * This function gets a string in s and checks, if it matches the pattern
 140  * given in p.
 141  *
 142  * Return:
 143  *   0 = match.
 144  *   1 = no match.
 145  *   2 = no match. Would eventually match, if s would be longer.
 146  *
 147  * Possible Patterns:
 148  *
 149  * '?'     matches one character
 150  * '*'     matches zero or more characters
 151  * [xyz]   matches the set of characters in brackets.
 152  * [^xyz]  matches any single character not in the set of characters
 153  */
 154
 155 static int
 156 isdn_wildmat(char *s, char *p)
 157 {
 158         register int last;
 159         register int matched;
 160         register int reverse;
 161         register int nostar = 1;
 162
 163         if (!(*s) && !(*p))
 164                 return(1);
 165         for (; *p; s++, p++)
 166                 switch (*p) {
 167                         case '\\':
 168                                 /*
 169                                  * Literal match with following character,
 170                                  * fall through.
 171                                  */
 172                                 p++;
 173                         default:
 174                                 if (*s != *p)
 175                                         return (*s == '\0')?2:1;
 176                                 continue;
 177                         case '?':
 178                                 /* Match anything. */
 179                                 if (*s == '\0')
 180                                         return (2);
 181                                 continue;
 182                         case '*':
 183                                 nostar = 0;
 184                                 /* Trailing star matches everything. */
 185                                 return (*++p ? isdn_star(s, p) : 0);
 186                         case '[':
 187                                 /* [^....] means inverse character class. */
 188                                 if ((reverse = (p[1] == '^')))
 189                                         p++;
 190                                 for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
 191                                         /* This next line requires a good C compiler. */
 192                                         if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
 193                                                 matched = 1;
 194                                 if (matched == reverse)
 195                                         return (1);
 196                                 continue;
 197                 }
 198         return (*s == '\0')?0:nostar;
 199 }
 200
 201 int isdn_msncmp( const char * msn1, const char * msn2 )
 202 {
 203         char TmpMsn1[ ISDN_MSNLEN ];
 204         char TmpMsn2[ ISDN_MSNLEN ];
 205         char *p;
 206
 207         for ( p = TmpMsn1; *msn1 && *msn1 != ':'; )  // Strip off a SPID
 208                 *p++ = *msn1++;
 209         *p = '\0';
 210
 211         for ( p = TmpMsn2; *msn2 && *msn2 != ':'; )  // Strip off a SPID
 212                 *p++ = *msn2++;
 213         *p = '\0';
 214
 215         return isdn_wildmat( TmpMsn1, TmpMsn2 );
 216 }
 217
 218 int
 219 isdn_dc2minor(int di, int ch)
 220 {
 221         int i;
 222         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 223                 if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
 224                         return i;
 225         return -1;
 226 }
 227
 228 static int isdn_timer_cnt1 = 0;
 229 static int isdn_timer_cnt2 = 0;
 230 static int isdn_timer_cnt3 = 0;
 231
 232 static void
 233 isdn_timer_funct(ulong dummy)
 234 {
 235         int tf = dev->tflags;
 236         if (tf & ISDN_TIMER_FAST) {
 237                 if (tf & ISDN_TIMER_MODEMREAD)
 238                         isdn_tty_readmodem();
 239                 if (tf & ISDN_TIMER_MODEMPLUS)
 240                         isdn_tty_modem_escape();
 241                 if (tf & ISDN_TIMER_MODEMXMIT)
 242                         isdn_tty_modem_xmit();
 243         }
 244         if (tf & ISDN_TIMER_SLOW) {
 245                 if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
 246                         isdn_timer_cnt1 = 0;
 247                         if (tf & ISDN_TIMER_NETDIAL)
 248                                 isdn_net_dial();
 249                 }
 250                 if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
 251                         isdn_timer_cnt2 = 0;
 252                         if (tf & ISDN_TIMER_NETHANGUP)
 253                                 isdn_net_autohup();
 254                         if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
 255                                 isdn_timer_cnt3 = 0;
 256                                 if (tf & ISDN_TIMER_MODEMRING)
 257                                         isdn_tty_modem_ring();
 258                         }
 259                         if (tf & ISDN_TIMER_CARRIER)
 260                                 isdn_tty_carrier_timeout();
 261                 }
 262         }
 263         if (tf)
 264                 mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
 265 }
 266
 267 void
 268 isdn_timer_ctrl(int tf, int onoff)
 269 {
 270         unsigned long flags;
 271         int old_tflags;
 272
 273         spin_lock_irqsave(&dev->timerlock, flags);
 274         if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
 275                 /* If the slow-timer wasn't activated until now */
 276                 isdn_timer_cnt1 = 0;
 277                 isdn_timer_cnt2 = 0;
 278         }
 279         old_tflags = dev->tflags;
 280         if (onoff)
 281                 dev->tflags |= tf;
 282         else
 283                 dev->tflags &= ~tf;
 284         if (dev->tflags && !old_tflags)
 285                 mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
 286         spin_unlock_irqrestore(&dev->timerlock, flags);
 287 }
 288
 289 /*
 290  * Receive a packet from B-Channel. (Called from low-level-module)
 291  */
 292 static void
 293 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
 294 {
 295         int i;
 296
 297         if ((i = isdn_dc2minor(di, channel)) == -1) {
 298                 dev_kfree_skb(skb);
 299                 return;
 300         }
 301         /* Update statistics */
 302         dev->ibytes[i] += skb->len;
 303
 304         /* First, try to deliver data to network-device */
 305         if (isdn_net_rcv_skb(i, skb))
 306                 return;
 307
 308         /* V.110 handling
 309          * makes sense for async streams only, so it is
 310          * called after possible net-device delivery.
 311          */
 312         if (dev->v110[i]) {
 313                 atomic_inc(&dev->v110use[i]);
 314                 skb = isdn_v110_decode(dev->v110[i], skb);
 315                 atomic_dec(&dev->v110use[i]);
 316                 if (!skb)
 317                         return;
 318         }
 319
 320         /* No network-device found, deliver to tty or raw-channel */
 321         if (skb->len) {
 322                 if (isdn_tty_rcv_skb(i, di, channel, skb))
 323                         return;
 324                 wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
 325         } else
 326                 dev_kfree_skb(skb);
 327 }
 328
 329 /*
 330  * Intercept command from Linklevel to Lowlevel.
 331  * If layer 2 protocol is V.110 and this is not supported by current
 332  * lowlevel-driver, use driver's transparent mode and handle V.110 in
 333  * linklevel instead.
 334  */
 335 int
 336 isdn_command(isdn_ctrl *cmd)
 337 {
 338         if (cmd->driver == -1) {
 339                 printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
 340                 return(1);
 341         }
 342         if (!dev->drv[cmd->driver]) {
 343                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
 344                         cmd->command, cmd->driver);
 345                 return(1);
 346         }
 347         if (!dev->drv[cmd->driver]->interface) {
 348                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
 349                         cmd->command, cmd->driver);
 350                 return(1);
 351         }
 352         if (cmd->command == ISDN_CMD_SETL2) {
 353                 int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
 354                 unsigned long l2prot = (cmd->arg >> 8) & 255;
 355                 unsigned long features = (dev->drv[cmd->driver]->interface->features
 356                                                 >> ISDN_FEATURE_L2_SHIFT) &
 357                                                 ISDN_FEATURE_L2_MASK;
 358                 unsigned long l2_feature = (1 << l2prot);
 359
 360                 switch (l2prot) {
 361                         case ISDN_PROTO_L2_V11096:
 362                         case ISDN_PROTO_L2_V11019:
 363                         case ISDN_PROTO_L2_V11038:
 364                         /* If V.110 requested, but not supported by
 365                          * HL-driver, set emulator-flag and change
 366                          * Layer-2 to transparent
 367                          */
 368                                 if (!(features & l2_feature)) {
 369                                         dev->v110emu[idx] = l2prot;
 370                                         cmd->arg = (cmd->arg & 255) |
 371                                                 (ISDN_PROTO_L2_TRANS << 8);
 372                                 } else
 373                                         dev->v110emu[idx] = 0;
 374                 }
 375         }
 376         return dev->drv[cmd->driver]->interface->command(cmd);
 377 }
 378
 379 void
 380 isdn_all_eaz(int di, int ch)
 381 {
 382         isdn_ctrl cmd;
 383
 384         if (di < 0)
 385                 return;
 386         cmd.driver = di;
 387         cmd.arg = ch;
 388         cmd.command = ISDN_CMD_SETEAZ;
 389         cmd.parm.num[0] = '\0';
 390         isdn_command(&cmd);
 391 }
 392
 393 /*
 394  * Begin of a CAPI like LL<->HL interface, currently used only for
 395  * supplementary service (CAPI 2.0 part III)
 396  */
 397 #include <linux/isdn/capicmd.h>
 398
 399 static int
 400 isdn_capi_rec_hl_msg(capi_msg *cm) {
 401
 402         int di;
 403         int ch;
 404
 405         di = (cm->adr.Controller & 0x7f) -1;
 406         ch = isdn_dc2minor(di, (cm->adr.Controller>>8)& 0x7f);
 407         switch(cm->Command) {
 408                 case CAPI_FACILITY:
 409                         /* in the moment only handled in tty */
 410                         return(isdn_tty_capi_facility(cm));
 411                 default:
 412                         return(-1);
 413         }
 414 }
 415
 416 static int
 417 isdn_status_callback(isdn_ctrl * c)
 418 {
 419         int di;
 420         u_long flags;
 421         int i;
 422         int r;
 423         int retval = 0;
 424         isdn_ctrl cmd;
 425         isdn_net_dev *p;
 426
 427         di = c->driver;
 428         i = isdn_dc2minor(di, c->arg);
 429         switch (c->command) {
 430                 case ISDN_STAT_BSENT:
 431                         if (i < 0)
 432                                 return -1;
 433                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 434                                 return 0;
 435                         if (isdn_net_stat_callback(i, c))
 436                                 return 0;
 437                         if (isdn_v110_stat_callback(i, c))
 438                                 return 0;
 439                         if (isdn_tty_stat_callback(i, c))
 440                                 return 0;
 441                         wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
 442                         break;
 443                 case ISDN_STAT_STAVAIL:
 444                         dev->drv[di]->stavail += c->arg;
 445                         wake_up_interruptible(&dev->drv[di]->st_waitq);
 446                         break;
 447                 case ISDN_STAT_RUN:
 448                         dev->drv[di]->flags |= DRV_FLAG_RUNNING;
 449                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 450                                 if (dev->drvmap[i] == di)
 451                                         isdn_all_eaz(di, dev->chanmap[i]);
 452                         set_global_features();
 453                         break;
 454                 case ISDN_STAT_STOP:
 455                         dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
 456                         break;
 457                 case ISDN_STAT_ICALL:
 458                         if (i < 0)
 459                                 return -1;
 460 #ifdef ISDN_DEBUG_STATCALLB
 461                         printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
 462 #endif
 463                         if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
 464                                 cmd.driver = di;
 465                                 cmd.arg = c->arg;
 466                                 cmd.command = ISDN_CMD_HANGUP;
 467                                 isdn_command(&cmd);
 468                                 return 0;
 469                         }
 470                         /* Try to find a network-interface which will accept incoming call */
 471                         r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
 472                         switch (r) {
 473                                 case 0:
 474                                         /* No network-device replies.
 475                                          * Try ttyI's.
 476                                          * These return 0 on no match, 1 on match and
 477                                          * 3 on eventually match, if CID is longer.
 478                                          */
 479                                         if (c->command == ISDN_STAT_ICALL)
 480                                           if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return(retval);
 481 #ifdef CONFIG_ISDN_DIVERSION
 482                                          if (divert_if)
 483                                           if ((retval = divert_if->stat_callback(c)))
 484                                             return(retval); /* processed */
 485 #endif /* CONFIG_ISDN_DIVERSION */
 486                                         if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
 487                                                 /* No tty responding */
 488                                                 cmd.driver = di;
 489                                                 cmd.arg = c->arg;
 490                                                 cmd.command = ISDN_CMD_HANGUP;
 491                                                 isdn_command(&cmd);
 492                                                 retval = 2;
 493                                         }
 494                                         break;
 495                                 case 1:
 496                                         /* Schedule connection-setup */
 497                                         isdn_net_dial();
 498                                         cmd.driver = di;
 499                                         cmd.arg = c->arg;
 500                                         cmd.command = ISDN_CMD_ACCEPTD;
 501                                         for ( p = dev->netdev; p; p = p->next )
 502                                                 if ( p->local->isdn_channel == cmd.arg )
 503                                                 {
 504                                                         strcpy( cmd.parm.setup.eazmsn, p->local->msn );
 505                                                         isdn_command(&cmd);
 506                                                         retval = 1;
 507                                                         break;
 508                                                 }
 509                                         break;
 510
 511                                 case 2: /* For calling back, first reject incoming call ... */
 512                                 case 3: /* Interface found, but down, reject call actively  */
 513                                         retval = 2;
 514                                         printk(KERN_INFO "isdn: Rejecting Call\n");
 515                                         cmd.driver = di;
 516                                         cmd.arg = c->arg;
 517                                         cmd.command = ISDN_CMD_HANGUP;
 518                                         isdn_command(&cmd);
 519                                         if (r == 3)
 520                                                 break;
 521                                         /* Fall through */
 522                                 case 4:
 523                                         /* ... then start callback. */
 524                                         isdn_net_dial();
 525                                         break;
 526                                 case 5:
 527                                         /* Number would eventually match, if longer */
 528                                         retval = 3;
 529                                         break;
 530                         }
 531 #ifdef ISDN_DEBUG_STATCALLB
 532                         printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
 533 #endif
 534                         return retval;
 535                         break;
 536                 case ISDN_STAT_CINF:
 537                         if (i < 0)
 538                                 return -1;
 539 #ifdef ISDN_DEBUG_STATCALLB
 540                         printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
 541 #endif
 542                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 543                                 return 0;
 544                         if (strcmp(c->parm.num, "0"))
 545                                 isdn_net_stat_callback(i, c);
 546                         isdn_tty_stat_callback(i, c);
 547                         break;
 548                 case ISDN_STAT_CAUSE:
 549 #ifdef ISDN_DEBUG_STATCALLB
 550                         printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
 551 #endif
 552                         printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
 553                                dev->drvid[di], c->arg, c->parm.num);
 554                         isdn_tty_stat_callback(i, c);
 555 #ifdef CONFIG_ISDN_DIVERSION
 556                         if (divert_if)
 557                          divert_if->stat_callback(c);
 558 #endif /* CONFIG_ISDN_DIVERSION */
 559                         break;
 560                 case ISDN_STAT_DISPLAY:
 561 #ifdef ISDN_DEBUG_STATCALLB
 562                         printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
 563 #endif
 564                         isdn_tty_stat_callback(i, c);
 565 #ifdef CONFIG_ISDN_DIVERSION
 566                         if (divert_if)
 567                          divert_if->stat_callback(c);
 568 #endif /* CONFIG_ISDN_DIVERSION */
 569                         break;
 570                 case ISDN_STAT_DCONN:
 571                         if (i < 0)
 572                                 return -1;
 573 #ifdef ISDN_DEBUG_STATCALLB
 574                         printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
 575 #endif
 576                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 577                                 return 0;
 578                         /* Find any net-device, waiting for D-channel setup */
 579                         if (isdn_net_stat_callback(i, c))
 580                                 break;
 581                         isdn_v110_stat_callback(i, c);
 582                         /* Find any ttyI, waiting for D-channel setup */
 583                         if (isdn_tty_stat_callback(i, c)) {
 584                                 cmd.driver = di;
 585                                 cmd.arg = c->arg;
 586                                 cmd.command = ISDN_CMD_ACCEPTB;
 587                                 isdn_command(&cmd);
 588                                 break;
 589                         }
 590                         break;
 591                 case ISDN_STAT_DHUP:
 592                         if (i < 0)
 593                                 return -1;
 594 #ifdef ISDN_DEBUG_STATCALLB
 595                         printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
 596 #endif
 597                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 598                                 return 0;
 599                         dev->drv[di]->online &= ~(1 << (c->arg));
 600                         isdn_info_update();
 601                         /* Signal hangup to network-devices */
 602                         if (isdn_net_stat_callback(i, c))
 603                                 break;
 604                         isdn_v110_stat_callback(i, c);
 605                         if (isdn_tty_stat_callback(i, c))
 606                                 break;
 607 #ifdef CONFIG_ISDN_DIVERSION
 608                         if (divert_if)
 609                          divert_if->stat_callback(c);
 610 #endif /* CONFIG_ISDN_DIVERSION */
 611                         break;
 612                         break;
 613                 case ISDN_STAT_BCONN:
 614                         if (i < 0)
 615                                 return -1;
 616 #ifdef ISDN_DEBUG_STATCALLB
 617                         printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
 618 #endif
 619                         /* Signal B-channel-connect to network-devices */
 620                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 621                                 return 0;
 622                         dev->drv[di]->online |= (1 << (c->arg));
 623                         isdn_info_update();
 624                         if (isdn_net_stat_callback(i, c))
 625                                 break;
 626                         isdn_v110_stat_callback(i, c);
 627                         if (isdn_tty_stat_callback(i, c))
 628                                 break;
 629                         break;
 630                 case ISDN_STAT_BHUP:
 631                         if (i < 0)
 632                                 return -1;
 633 #ifdef ISDN_DEBUG_STATCALLB
 634                         printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
 635 #endif
 636                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 637                                 return 0;
 638                         dev->drv[di]->online &= ~(1 << (c->arg));
 639                         isdn_info_update();
 640 #ifdef CONFIG_ISDN_X25
 641                         /* Signal hangup to network-devices */
 642                         if (isdn_net_stat_callback(i, c))
 643                                 break;
 644 #endif
 645                         isdn_v110_stat_callback(i, c);
 646                         if (isdn_tty_stat_callback(i, c))
 647                                 break;
 648                         break;
 649                 case ISDN_STAT_NODCH:
 650                         if (i < 0)
 651                                 return -1;
 652 #ifdef ISDN_DEBUG_STATCALLB
 653                         printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
 654 #endif
 655                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 656                                 return 0;
 657                         if (isdn_net_stat_callback(i, c))
 658                                 break;
 659                         if (isdn_tty_stat_callback(i, c))
 660                                 break;
 661                         break;
 662                 case ISDN_STAT_ADDCH:
 663                         spin_lock_irqsave(&dev->lock, flags);
 664                         if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
 665                                 spin_unlock_irqrestore(&dev->lock, flags);
 666                                 return -1;
 667                         }
 668                         spin_unlock_irqrestore(&dev->lock, flags);
 669                         isdn_info_update();
 670                         break;
 671                 case ISDN_STAT_DISCH:
 672                         spin_lock_irqsave(&dev->lock, flags);
 673                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 674                                 if ((dev->drvmap[i] == di) &&
 675                                     (dev->chanmap[i] == c->arg)) {
 676                                     if (c->parm.num[0])
 677                                       dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 678                                     else
 679                                       if (USG_NONE(dev->usage[i])) {
 680                                         dev->usage[i] |= ISDN_USAGE_DISABLED;
 681                                       }
 682                                       else
 683                                         retval = -1;
 684                                     break;
 685                                 }
 686                         spin_unlock_irqrestore(&dev->lock, flags);
 687                         isdn_info_update();
 688                         break;
 689                 case ISDN_STAT_UNLOAD:
 690                         while (dev->drv[di]->locks > 0) {
 691                                 isdn_unlock_driver(dev->drv[di]);
 692                         }
 693                         spin_lock_irqsave(&dev->lock, flags);
 694                         isdn_tty_stat_callback(i, c);
 695                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 696                                 if (dev->drvmap[i] == di) {
 697                                         dev->drvmap[i] = -1;
 698                                         dev->chanmap[i] = -1;
 699                                         dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 700                                 }
 701                         dev->drivers--;
 702                         dev->channels -= dev->drv[di]->channels;
 703                         kfree(dev->drv[di]->rcverr);
 704                         kfree(dev->drv[di]->rcvcount);
 705                         for (i = 0; i < dev->drv[di]->channels; i++)
 706                                 skb_queue_purge(&dev->drv[di]->rpqueue[i]);
 707                         kfree(dev->drv[di]->rpqueue);
 708                         kfree(dev->drv[di]->rcv_waitq);
 709                         kfree(dev->drv[di]);
 710                         dev->drv[di] = NULL;
 711                         dev->drvid[di][0] = '\0';
 712                         isdn_info_update();
 713                         set_global_features();
 714                         spin_unlock_irqrestore(&dev->lock, flags);
 715                         return 0;
 716                 case ISDN_STAT_L1ERR:
 717                         break;
 718                 case CAPI_PUT_MESSAGE:
 719                         return(isdn_capi_rec_hl_msg(&c->parm.cmsg));
 720 #ifdef CONFIG_ISDN_TTY_FAX
 721                 case ISDN_STAT_FAXIND:
 722                         isdn_tty_stat_callback(i, c);
 723                         break;
 724 #endif
 725 #ifdef CONFIG_ISDN_AUDIO
 726                 case ISDN_STAT_AUDIO:
 727                         isdn_tty_stat_callback(i, c);
 728                         break;
 729 #endif
 730 #ifdef CONFIG_ISDN_DIVERSION
 731                 case ISDN_STAT_PROT:
 732                 case ISDN_STAT_REDIR:
 733                         if (divert_if)
 734                           return(divert_if->stat_callback(c));
 735 #endif /* CONFIG_ISDN_DIVERSION */
 736                 default:
 737                         return -1;
 738         }
 739         return 0;
 740 }
 741
 742 /*
 743  * Get integer from char-pointer, set pointer to end of number
 744  */
 745 int
 746 isdn_getnum(char **p)
 747 {
 748         int v = -1;
 749
 750         while (*p[0] >= '0' && *p[0] <= '9')
 751                 v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
 752         return v;
 753 }
 754
 755 #define DLE 0x10
 756
 757 /*
 758  * isdn_readbchan() tries to get data from the read-queue.
 759  * It MUST be called with interrupts off.
 760  *
 761  * Be aware that this is not an atomic operation when sleep != 0, even though
 762  * interrupts are turned off! Well, like that we are currently only called
 763  * on behalf of a read system call on raw device files (which are documented
 764  * to be dangerous and for for debugging purpose only). The inode semaphore
 765  * takes care that this is not called for the same minor device number while
 766  * we are sleeping, but access is not serialized against simultaneous read()
 767  * from the corresponding ttyI device. Can other ugly events, like changes
 768  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 769  */
 770 int
 771 isdn_readbchan(int di, int channel, u_char * buf, u_char * fp, int len, wait_queue_head_t *sleep)
 772 {
 773         int count;
 774         int count_pull;
 775         int count_put;
 776         int dflag;
 777         struct sk_buff *skb;
 778         u_char *cp;
 779
 780         if (!dev->drv[di])
 781                 return 0;
 782         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
 783                 if (sleep)
 784                         interruptible_sleep_on(sleep);
 785                 else
 786                         return 0;
 787         }
 788         if (len > dev->drv[di]->rcvcount[channel])
 789                 len = dev->drv[di]->rcvcount[channel];
 790         cp = buf;
 791         count = 0;
 792         while (len) {
 793                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 794                         break;
 795 #ifdef CONFIG_ISDN_AUDIO
 796                 if (ISDN_AUDIO_SKB_LOCK(skb))
 797                         break;
 798                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 799                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 800                         char *p = skb->data;
 801                         unsigned long DLEmask = (1 << channel);
 802
 803                         dflag = 0;
 804                         count_pull = count_put = 0;
 805                         while ((count_pull < skb->len) && (len > 0)) {
 806                                 len--;
 807                                 if (dev->drv[di]->DLEflag & DLEmask) {
 808                                         *cp++ = DLE;
 809                                         dev->drv[di]->DLEflag &= ~DLEmask;
 810                                 } else {
 811                                         *cp++ = *p;
 812                                         if (*p == DLE) {
 813                                                 dev->drv[di]->DLEflag |= DLEmask;
 814                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 815                                         }
 816                                         p++;
 817                                         count_pull++;
 818                                 }
 819                                 count_put++;
 820                         }
 821                         if (count_pull >= skb->len)
 822                                 dflag = 1;
 823                 } else {
 824 #endif
 825                         /* No DLE's in buff, so simply copy it */
 826                         dflag = 1;
 827                         if ((count_pull = skb->len) > len) {
 828                                 count_pull = len;
 829                                 dflag = 0;
 830                         }
 831                         count_put = count_pull;
 832                         skb_copy_from_linear_data(skb, cp, count_put);
 833                         cp += count_put;
 834                         len -= count_put;
 835 #ifdef CONFIG_ISDN_AUDIO
 836                 }
 837 #endif
 838                 count += count_put;
 839                 if (fp) {
 840                         memset(fp, 0, count_put);
 841                         fp += count_put;
 842                 }
 843                 if (dflag) {
 844                         /* We got all the data in this buff.
 845                          * Now we can dequeue it.
 846                          */
 847                         if (fp)
 848                                 *(fp - 1) = 0xff;
 849 #ifdef CONFIG_ISDN_AUDIO
 850                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 851 #endif
 852                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 853                         dev_kfree_skb(skb);
 854                 } else {
 855                         /* Not yet emptied this buff, so it
 856                          * must stay in the queue, for further calls
 857                          * but we pull off the data we got until now.
 858                          */
 859                         skb_pull(skb, count_pull);
 860 #ifdef CONFIG_ISDN_AUDIO
 861                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 862 #endif
 863                 }
 864                 dev->drv[di]->rcvcount[channel] -= count_put;
 865         }
 866         return count;
 867 }
 868
 869 /*
 870  * isdn_readbchan_tty() tries to get data from the read-queue.
 871  * It MUST be called with interrupts off.
 872  *
 873  * Be aware that this is not an atomic operation when sleep != 0, even though
 874  * interrupts are turned off! Well, like that we are currently only called
 875  * on behalf of a read system call on raw device files (which are documented
 876  * to be dangerous and for for debugging purpose only). The inode semaphore
 877  * takes care that this is not called for the same minor device number while
 878  * we are sleeping, but access is not serialized against simultaneous read()
 879  * from the corresponding ttyI device. Can other ugly events, like changes
 880  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 881  */
 882 int
 883 isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
 884 {
 885         int count;
 886         int count_pull;
 887         int count_put;
 888         int dflag;
 889         struct sk_buff *skb;
 890         char last = 0;
 891         int len;
 892
 893         if (!dev->drv[di])
 894                 return 0;
 895         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 896                         return 0;
 897
 898         len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
 899         if(len == 0)
 900                 return len;
 901
 902         count = 0;
 903         while (len) {
 904                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 905                         break;
 906 #ifdef CONFIG_ISDN_AUDIO
 907                 if (ISDN_AUDIO_SKB_LOCK(skb))
 908                         break;
 909                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 910                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 911                         char *p = skb->data;
 912                         unsigned long DLEmask = (1 << channel);
 913
 914                         dflag = 0;
 915                         count_pull = count_put = 0;
 916                         while ((count_pull < skb->len) && (len > 0)) {
 917                                 /* push every character but the last to the tty buffer directly */
 918                                 if ( count_put )
 919                                         tty_insert_flip_char(tty, last, TTY_NORMAL);
 920                                 len--;
 921                                 if (dev->drv[di]->DLEflag & DLEmask) {
 922                                         last = DLE;
 923                                         dev->drv[di]->DLEflag &= ~DLEmask;
 924                                 } else {
 925                                         last = *p;
 926                                         if (last == DLE) {
 927                                                 dev->drv[di]->DLEflag |= DLEmask;
 928                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 929                                         }
 930                                         p++;
 931                                         count_pull++;
 932                                 }
 933                                 count_put++;
 934                         }
 935                         if (count_pull >= skb->len)
 936                                 dflag = 1;
 937                 } else {
 938 #endif
 939                         /* No DLE's in buff, so simply copy it */
 940                         dflag = 1;
 941                         if ((count_pull = skb->len) > len) {
 942                                 count_pull = len;
 943                                 dflag = 0;
 944                         }
 945                         count_put = count_pull;
 946                         if(count_put > 1)
 947                                 tty_insert_flip_string(tty, skb->data, count_put - 1);
 948                         last = skb->data[count_put - 1];
 949                         len -= count_put;
 950 #ifdef CONFIG_ISDN_AUDIO
 951                 }
 952 #endif
 953                 count += count_put;
 954                 if (dflag) {
 955                         /* We got all the data in this buff.
 956                          * Now we can dequeue it.
 957                          */
 958                         if(cisco_hack)
 959                                 tty_insert_flip_char(tty, last, 0xFF);
 960                         else
 961                                 tty_insert_flip_char(tty, last, TTY_NORMAL);
 962 #ifdef CONFIG_ISDN_AUDIO
 963                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 964 #endif
 965                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 966                         dev_kfree_skb(skb);
 967                 } else {
 968                         tty_insert_flip_char(tty, last, TTY_NORMAL);
 969                         /* Not yet emptied this buff, so it
 970                          * must stay in the queue, for further calls
 971                          * but we pull off the data we got until now.
 972                          */
 973                         skb_pull(skb, count_pull);
 974 #ifdef CONFIG_ISDN_AUDIO
 975                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 976 #endif
 977                 }
 978                 dev->drv[di]->rcvcount[channel] -= count_put;
 979         }
 980         return count;
 981 }
 982
 983
 984 static inline int
 985 isdn_minor2drv(int minor)
 986 {
 987         return (dev->drvmap[minor]);
 988 }
 989
 990 static inline int
 991 isdn_minor2chan(int minor)
 992 {
 993         return (dev->chanmap[minor]);
 994 }
 995
 996 static char *
 997 isdn_statstr(void)
 998 {
 999         static char istatbuf[2048];
1000         char *p;
1001         int i;
1002
1003         sprintf(istatbuf, "idmap:\t");
1004         p = istatbuf + strlen(istatbuf);
1005         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1006                 sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
1007                 p = istatbuf + strlen(istatbuf);
1008         }
1009         sprintf(p, "\nchmap:\t");
1010         p = istatbuf + strlen(istatbuf);
1011         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1012                 sprintf(p, "%d ", dev->chanmap[i]);
1013                 p = istatbuf + strlen(istatbuf);
1014         }
1015         sprintf(p, "\ndrmap:\t");
1016         p = istatbuf + strlen(istatbuf);
1017         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1018                 sprintf(p, "%d ", dev->drvmap[i]);
1019                 p = istatbuf + strlen(istatbuf);
1020         }
1021         sprintf(p, "\nusage:\t");
1022         p = istatbuf + strlen(istatbuf);
1023         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1024                 sprintf(p, "%d ", dev->usage[i]);
1025                 p = istatbuf + strlen(istatbuf);
1026         }
1027         sprintf(p, "\nflags:\t");
1028         p = istatbuf + strlen(istatbuf);
1029         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
1030                 if (dev->drv[i]) {
1031                         sprintf(p, "%ld ", dev->drv[i]->online);
1032                         p = istatbuf + strlen(istatbuf);
1033                 } else {
1034                         sprintf(p, "? ");
1035                         p = istatbuf + strlen(istatbuf);
1036                 }
1037         }
1038         sprintf(p, "\nphone:\t");
1039         p = istatbuf + strlen(istatbuf);
1040         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1041                 sprintf(p, "%s ", dev->num[i]);
1042                 p = istatbuf + strlen(istatbuf);
1043         }
1044         sprintf(p, "\n");
1045         return istatbuf;
1046 }
1047
1048 /* Module interface-code */
1049
1050 void
1051 isdn_info_update(void)
1052 {
1053         infostruct *p = dev->infochain;
1054
1055         while (p) {
1056                 *(p->private) = 1;
1057                 p = (infostruct *) p->next;
1058         }
1059         wake_up_interruptible(&(dev->info_waitq));
1060 }
1061
1062 static ssize_t
1063 isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
1064 {
1065         uint minor = iminor(file->f_path.dentry->d_inode);
1066         int len = 0;
1067         int drvidx;
1068         int chidx;
1069         int retval;
1070         char *p;
1071
1072         lock_kernel();
1073         if (minor == ISDN_MINOR_STATUS) {
1074                 if (!file->private_data) {
1075                         if (file->f_flags & O_NONBLOCK) {
1076                                 retval = -EAGAIN;
1077                                 goto out;
1078                         }
1079                         interruptible_sleep_on(&(dev->info_waitq));
1080                 }
1081                 p = isdn_statstr();
1082                 file->private_data = NULL;
1083                 if ((len = strlen(p)) <= count) {
1084                         if (copy_to_user(buf, p, len)) {
1085                                 retval = -EFAULT;
1086                                 goto out;
1087                         }
1088                         *off += len;
1089                         retval = len;
1090                         goto out;
1091                 }
1092                 retval = 0;
1093                 goto out;
1094         }
1095         if (!dev->drivers) {
1096                 retval = -ENODEV;
1097                 goto out;
1098         }
1099         if (minor <= ISDN_MINOR_BMAX) {
1100                 printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1101                 drvidx = isdn_minor2drv(minor);
1102                 if (drvidx < 0) {
1103                         retval = -ENODEV;
1104                         goto out;
1105                 }
1106                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1107                         retval = -ENODEV;
1108                         goto out;
1109                 }
1110                 chidx = isdn_minor2chan(minor);
1111                 if (!(p = kmalloc(count, GFP_KERNEL))) {
1112                         retval = -ENOMEM;
1113                         goto out;
1114                 }
1115                 len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1116                                      &dev->drv[drvidx]->rcv_waitq[chidx]);
1117                 *off += len;
1118                 if (copy_to_user(buf,p,len))
1119                         len = -EFAULT;
1120                 kfree(p);
1121                 retval = len;
1122                 goto out;
1123         }
1124         if (minor <= ISDN_MINOR_CTRLMAX) {
1125                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1126                 if (drvidx < 0) {
1127                         retval = -ENODEV;
1128                         goto out;
1129                 }
1130                 if (!dev->drv[drvidx]->stavail) {
1131                         if (file->f_flags & O_NONBLOCK) {
1132                                 retval = -EAGAIN;
1133                                 goto out;
1134                         }
1135                         interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
1136                 }
1137                 if (dev->drv[drvidx]->interface->readstat) {
1138                         if (count > dev->drv[drvidx]->stavail)
1139                                 count = dev->drv[drvidx]->stavail;
1140                         len = dev->drv[drvidx]->interface->readstat(buf, count,
1141                                 drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1142                         if (len < 0) {
1143                                 retval = len;
1144                                 goto out;
1145                         }
1146                 } else {
1147                         len = 0;
1148                 }
1149                 if (len)
1150                         dev->drv[drvidx]->stavail -= len;
1151                 else
1152                         dev->drv[drvidx]->stavail = 0;
1153                 *off += len;
1154                 retval = len;
1155                 goto out;
1156         }
1157 #ifdef CONFIG_ISDN_PPP
1158         if (minor <= ISDN_MINOR_PPPMAX) {
1159                 retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1160                 goto out;
1161         }
1162 #endif
1163         retval = -ENODEV;
1164  out:
1165         unlock_kernel();
1166         return retval;
1167 }
1168
1169 static ssize_t
1170 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
1171 {
1172         uint minor = iminor(file->f_path.dentry->d_inode);
1173         int drvidx;
1174         int chidx;
1175         int retval;
1176
1177         if (minor == ISDN_MINOR_STATUS)
1178                 return -EPERM;
1179         if (!dev->drivers)
1180                 return -ENODEV;
1181
1182         lock_kernel();
1183         if (minor <= ISDN_MINOR_BMAX) {
1184                 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1185                 drvidx = isdn_minor2drv(minor);
1186                 if (drvidx < 0) {
1187                         retval = -ENODEV;
1188                         goto out;
1189                 }
1190                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1191                         retval = -ENODEV;
1192                         goto out;
1193                 }
1194                 chidx = isdn_minor2chan(minor);
1195                 while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
1196                         interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
1197                 goto out;
1198         }
1199         if (minor <= ISDN_MINOR_CTRLMAX) {
1200                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1201                 if (drvidx < 0) {
1202                         retval = -ENODEV;
1203                         goto out;
1204                 }
1205                 /*
1206                  * We want to use the isdnctrl device to load the firmware
1207                  *
1208                  if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1209                  return -ENODEV;
1210                  */
1211                 if (dev->drv[drvidx]->interface->writecmd)
1212                         retval = dev->drv[drvidx]->interface->
1213                                 writecmd(buf, count, drvidx,
1214                                 isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1215                 else
1216                         retval = count;
1217                 goto out;
1218         }
1219 #ifdef CONFIG_ISDN_PPP
1220         if (minor <= ISDN_MINOR_PPPMAX) {
1221                 retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1222                 goto out;
1223         }
1224 #endif
1225         retval = -ENODEV;
1226  out:
1227         unlock_kernel();
1228         return retval;
1229 }
1230
1231 static unsigned int
1232 isdn_poll(struct file *file, poll_table * wait)
1233 {
1234         unsigned int mask = 0;
1235         unsigned int minor = iminor(file->f_path.dentry->d_inode);
1236         int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1237
1238         lock_kernel();
1239         if (minor == ISDN_MINOR_STATUS) {
1240                 poll_wait(file, &(dev->info_waitq), wait);
1241                 /* mask = POLLOUT | POLLWRNORM; */
1242                 if (file->private_data) {
1243                         mask |= POLLIN | POLLRDNORM;
1244                 }
1245                 goto out;
1246         }
1247         if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1248                 if (drvidx < 0) {
1249                         /* driver deregistered while file open */
1250                         mask = POLLHUP;
1251                         goto out;
1252                 }
1253                 poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1254                 mask = POLLOUT | POLLWRNORM;
1255                 if (dev->drv[drvidx]->stavail) {
1256                         mask |= POLLIN | POLLRDNORM;
1257                 }
1258                 goto out;
1259         }
1260 #ifdef CONFIG_ISDN_PPP
1261         if (minor <= ISDN_MINOR_PPPMAX) {
1262                 mask = isdn_ppp_poll(file, wait);
1263                 goto out;
1264         }
1265 #endif
1266         mask = POLLERR;
1267  out:
1268         unlock_kernel();
1269         return mask;
1270 }
1271
1272
1273 static int
1274 isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
1275 {
1276         uint minor = iminor(inode);
1277         isdn_ctrl c;
1278         int drvidx;
1279         int chidx;
1280         int ret;
1281         int i;
1282         char __user *p;
1283         char *s;
1284         union iocpar {
1285                 char name[10];
1286                 char bname[22];
1287                 isdn_ioctl_struct iocts;
1288                 isdn_net_ioctl_phone phone;
1289                 isdn_net_ioctl_cfg cfg;
1290         } iocpar;
1291         void __user *argp = (void __user *)arg;
1292
1293 #define name  iocpar.name
1294 #define bname iocpar.bname
1295 #define iocts iocpar.iocts
1296 #define phone iocpar.phone
1297 #define cfg   iocpar.cfg
1298
1299         if (minor == ISDN_MINOR_STATUS) {
1300                 switch (cmd) {
1301                         case IIOCGETDVR:
1302                                 return (TTY_DV +
1303                                         (NET_DV << 8) +
1304                                         (INF_DV << 16));
1305                         case IIOCGETCPS:
1306                                 if (arg) {
1307                                         ulong __user *p = argp;
1308                                         int i;
1309                                         if (!access_ok(VERIFY_WRITE, p,
1310                                                         sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
1311                                                 return -EFAULT;
1312                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1313                                                 put_user(dev->ibytes[i], p++);
1314                                                 put_user(dev->obytes[i], p++);
1315                                         }
1316                                         return 0;
1317                                 } else
1318                                         return -EINVAL;
1319                                 break;
1320 #ifdef CONFIG_NETDEVICES
1321                         case IIOCNETGPN:
1322                                 /* Get peer phone number of a connected
1323                                  * isdn network interface */
1324                                 if (arg) {
1325                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1326                                                 return -EFAULT;
1327                                         return isdn_net_getpeer(&phone, argp);
1328                                 } else
1329                                         return -EINVAL;
1330 #endif
1331                         default:
1332                                 return -EINVAL;
1333                 }
1334         }
1335         if (!dev->drivers)
1336                 return -ENODEV;
1337         if (minor <= ISDN_MINOR_BMAX) {
1338                 drvidx = isdn_minor2drv(minor);
1339                 if (drvidx < 0)
1340                         return -ENODEV;
1341                 chidx = isdn_minor2chan(minor);
1342                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1343                         return -ENODEV;
1344                 return 0;
1345         }
1346         if (minor <= ISDN_MINOR_CTRLMAX) {
1347 /*
1348  * isdn net devices manage lots of configuration variables as linked lists.
1349  * Those lists must only be manipulated from user space. Some of the ioctl's
1350  * service routines access user space and are not atomic. Therefor, ioctl's
1351  * manipulating the lists and ioctl's sleeping while accessing the lists
1352  * are serialized by means of a semaphore.
1353  */
1354                 switch (cmd) {
1355                         case IIOCNETDWRSET:
1356                                 printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1357                                 return(-EINVAL);
1358                         case IIOCNETLCR:
1359                                 printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1360                                 return -ENODEV;
1361 #ifdef CONFIG_NETDEVICES
1362                         case IIOCNETAIF:
1363                                 /* Add a network-interface */
1364                                 if (arg) {
1365                                         if (copy_from_user(name, argp, sizeof(name)))
1366                                                 return -EFAULT;
1367                                         s = name;
1368                                 } else {
1369                                         s = NULL;
1370                                 }
1371                                 ret = mutex_lock_interruptible(&dev->mtx);
1372                                 if( ret ) return ret;
1373                                 if ((s = isdn_net_new(s, NULL))) {
1374                                         if (copy_to_user(argp, s, strlen(s) + 1)){
1375                                                 ret = -EFAULT;
1376                                         } else {
1377                                                 ret = 0;
1378                                         }
1379                                 } else
1380                                         ret = -ENODEV;
1381                                 mutex_unlock(&dev->mtx);
1382                                 return ret;
1383                         case IIOCNETASL:
1384                                 /* Add a slave to a network-interface */
1385                                 if (arg) {
1386                                         if (copy_from_user(bname, argp, sizeof(bname) - 1))
1387                                                 return -EFAULT;
1388                                 } else
1389                                         return -EINVAL;
1390                                 ret = mutex_lock_interruptible(&dev->mtx);
1391                                 if( ret ) return ret;
1392                                 if ((s = isdn_net_newslave(bname))) {
1393                                         if (copy_to_user(argp, s, strlen(s) + 1)){
1394                                                 ret = -EFAULT;
1395                                         } else {
1396                                                 ret = 0;
1397                                         }
1398                                 } else
1399                                         ret = -ENODEV;
1400                                 mutex_unlock(&dev->mtx);
1401                                 return ret;
1402                         case IIOCNETDIF:
1403                                 /* Delete a network-interface */
1404                                 if (arg) {
1405                                         if (copy_from_user(name, argp, sizeof(name)))
1406                                                 return -EFAULT;
1407                                         ret = mutex_lock_interruptible(&dev->mtx);
1408                                         if( ret ) return ret;
1409                                         ret = isdn_net_rm(name);
1410                                         mutex_unlock(&dev->mtx);
1411                                         return ret;
1412                                 } else
1413                                         return -EINVAL;
1414                         case IIOCNETSCF:
1415                                 /* Set configurable parameters of a network-interface */
1416                                 if (arg) {
1417                                         if (copy_from_user(&cfg, argp, sizeof(cfg)))
1418                                                 return -EFAULT;
1419                                         return isdn_net_setcfg(&cfg);
1420                                 } else
1421                                         return -EINVAL;
1422                         case IIOCNETGCF:
1423                                 /* Get configurable parameters of a network-interface */
1424                                 if (arg) {
1425                                         if (copy_from_user(&cfg, argp, sizeof(cfg)))
1426                                                 return -EFAULT;
1427                                         if (!(ret = isdn_net_getcfg(&cfg))) {
1428                                                 if (copy_to_user(argp, &cfg, sizeof(cfg)))
1429                                                         return -EFAULT;
1430                                         }
1431                                         return ret;
1432                                 } else
1433                                         return -EINVAL;
1434                         case IIOCNETANM:
1435                                 /* Add a phone-number to a network-interface */
1436                                 if (arg) {
1437                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1438                                                 return -EFAULT;
1439                                         ret = mutex_lock_interruptible(&dev->mtx);
1440                                         if( ret ) return ret;
1441                                         ret = isdn_net_addphone(&phone);
1442                                         mutex_unlock(&dev->mtx);
1443                                         return ret;
1444                                 } else
1445                                         return -EINVAL;
1446                         case IIOCNETGNM:
1447                                 /* Get list of phone-numbers of a network-interface */
1448                                 if (arg) {
1449                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1450                                                 return -EFAULT;
1451                                         ret = mutex_lock_interruptible(&dev->mtx);
1452                                         if( ret ) return ret;
1453                                         ret = isdn_net_getphones(&phone, argp);
1454                                         mutex_unlock(&dev->mtx);
1455                                         return ret;
1456                                 } else
1457                                         return -EINVAL;
1458                         case IIOCNETDNM:
1459                                 /* Delete a phone-number of a network-interface */
1460                                 if (arg) {
1461                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1462                                                 return -EFAULT;
1463                                         ret = mutex_lock_interruptible(&dev->mtx);
1464                                         if( ret ) return ret;
1465                                         ret = isdn_net_delphone(&phone);
1466                                         mutex_unlock(&dev->mtx);
1467                                         return ret;
1468                                 } else
1469                                         return -EINVAL;
1470                         case IIOCNETDIL:
1471                                 /* Force dialing of a network-interface */
1472                                 if (arg) {
1473                                         if (copy_from_user(name, argp, sizeof(name)))
1474                                                 return -EFAULT;
1475                                         return isdn_net_force_dial(name);
1476                                 } else
1477                                         return -EINVAL;
1478 #ifdef CONFIG_ISDN_PPP
1479                         case IIOCNETALN:
1480                                 if (!arg)
1481                                         return -EINVAL;
1482                                 if (copy_from_user(name, argp, sizeof(name)))
1483                                         return -EFAULT;
1484                                 return isdn_ppp_dial_slave(name);
1485                         case IIOCNETDLN:
1486                                 if (!arg)
1487                                         return -EINVAL;
1488                                 if (copy_from_user(name, argp, sizeof(name)))
1489                                         return -EFAULT;
1490                                 return isdn_ppp_hangup_slave(name);
1491 #endif
1492                         case IIOCNETHUP:
1493                                 /* Force hangup of a network-interface */
1494                                 if (!arg)
1495                                         return -EINVAL;
1496                                 if (copy_from_user(name, argp, sizeof(name)))
1497                                         return -EFAULT;
1498                                 return isdn_net_force_hangup(name);
1499                                 break;
1500 #endif                          /* CONFIG_NETDEVICES */
1501                         case IIOCSETVER:
1502                                 dev->net_verbose = arg;
1503                                 printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1504                                 return 0;
1505                         case IIOCSETGST:
1506                                 if (arg)
1507                                         dev->global_flags |= ISDN_GLOBAL_STOPPED;
1508                                 else
1509                                         dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1510                                 printk(KERN_INFO "isdn: Global Mode %s\n",
1511                                        (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1512                                 return 0;
1513                         case IIOCSETBRJ:
1514                                 drvidx = -1;
1515                                 if (arg) {
1516                                         int i;
1517                                         char *p;
1518                                         if (copy_from_user(&iocts, argp,
1519                                              sizeof(isdn_ioctl_struct)))
1520                                                 return -EFAULT;
1521                                         iocts.drvid[sizeof(iocts.drvid)-1] = 0;
1522                                         if (strlen(iocts.drvid)) {
1523                                                 if ((p = strchr(iocts.drvid, ',')))
1524                                                         *p = 0;
1525                                                 drvidx = -1;
1526                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1527                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1528                                                                 drvidx = i;
1529                                                                 break;
1530                                                         }
1531                                         }
1532                                 }
1533                                 if (drvidx == -1)
1534                                         return -ENODEV;
1535                                 if (iocts.arg)
1536                                         dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1537                                 else
1538                                         dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1539                                 return 0;
1540                         case IIOCSIGPRF:
1541                                 dev->profd = current;
1542                                 return 0;
1543                                 break;
1544                         case IIOCGETPRF:
1545                                 /* Get all Modem-Profiles */
1546                                 if (arg) {
1547                                         char __user *p = argp;
1548                                         int i;
1549
1550                                         if (!access_ok(VERIFY_WRITE, argp,
1551                                         (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1552                                                    * ISDN_MAX_CHANNELS))
1553                                                 return -EFAULT;
1554
1555                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1556                                                 if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1557                                                       ISDN_MODEM_NUMREG))
1558                                                         return -EFAULT;
1559                                                 p += ISDN_MODEM_NUMREG;
1560                                                 if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1561                                                         return -EFAULT;
1562                                                 p += ISDN_MSNLEN;
1563                                                 if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1564                                                         return -EFAULT;
1565                                                 p += ISDN_LMSNLEN;
1566                                         }
1567                                         return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1568                                 } else
1569                                         return -EINVAL;
1570                                 break;
1571                         case IIOCSETPRF:
1572                                 /* Set all Modem-Profiles */
1573                                 if (arg) {
1574                                         char __user *p = argp;
1575                                         int i;
1576
1577                                         if (!access_ok(VERIFY_READ, argp,
1578                                         (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1579                                                    * ISDN_MAX_CHANNELS))
1580                                                 return -EFAULT;
1581
1582                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1583                                                 if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1584                                                      ISDN_MODEM_NUMREG))
1585                                                         return -EFAULT;
1586                                                 p += ISDN_MODEM_NUMREG;
1587                                                 if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1588                                                         return -EFAULT;
1589                                                 p += ISDN_LMSNLEN;
1590                                                 if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1591                                                         return -EFAULT;
1592                                                 p += ISDN_MSNLEN;
1593                                         }
1594                                         return 0;
1595                                 } else
1596                                         return -EINVAL;
1597                                 break;
1598                         case IIOCSETMAP:
1599                         case IIOCGETMAP:
1600                                 /* Set/Get MSN->EAZ-Mapping for a driver */
1601                                 if (arg) {
1602
1603                                         if (copy_from_user(&iocts, argp,
1604                                              sizeof(isdn_ioctl_struct)))
1605                                                 return -EFAULT;
1606                                         iocts.drvid[sizeof(iocts.drvid)-1] = 0;
1607                                         if (strlen(iocts.drvid)) {
1608                                                 drvidx = -1;
1609                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1610                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1611                                                                 drvidx = i;
1612                                                                 break;
1613                                                         }
1614                                         } else
1615                                                 drvidx = 0;
1616                                         if (drvidx == -1)
1617                                                 return -ENODEV;
1618                                         if (cmd == IIOCSETMAP) {
1619                                                 int loop = 1;
1620
1621                                                 p = (char __user *) iocts.arg;
1622                                                 i = 0;
1623                                                 while (loop) {
1624                                                         int j = 0;
1625
1626                                                         while (1) {
1627                                                                 if (!access_ok(VERIFY_READ, p, 1))
1628                                                                         return -EFAULT;
1629                                                                 get_user(bname[j], p++);
1630                                                                 switch (bname[j]) {
1631                                                                         case '\0':
1632                                                                                 loop = 0;
1633                                                                                 /* Fall through */
1634                                                                         case ',':
1635                                                                                 bname[j] = '\0';
1636                                                                                 strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1637                                                                                 j = ISDN_MSNLEN;
1638                                                                                 break;
1639                                                                         default:
1640                                                                                 j++;
1641                                                                 }
1642                                                                 if (j >= ISDN_MSNLEN)
1643                                                                         break;
1644                                                         }
1645                                                         if (++i > 9)
1646                                                                 break;
1647                                                 }
1648                                         } else {
1649                                                 p = (char __user *) iocts.arg;
1650                                                 for (i = 0; i < 10; i++) {
1651                                                         snprintf(bname, sizeof(bname), "%s%s",
1652                                                                 strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1653                                                                 dev->drv[drvidx]->msn2eaz[i] : "_",
1654                                                                 (i < 9) ? "," : "\0");
1655                                                         if (copy_to_user(p, bname, strlen(bname) + 1))
1656                                                                 return -EFAULT;
1657                                                         p += strlen(bname);
1658                                                 }
1659                                         }
1660                                         return 0;
1661                                 } else
1662                                         return -EINVAL;
1663                         case IIOCDBGVAR:
1664                                 if (arg) {
1665                                         if (copy_to_user(argp, &dev, sizeof(ulong)))
1666                                                 return -EFAULT;
1667                                         return 0;
1668                                 } else
1669                                         return -EINVAL;
1670                                 break;
1671                         default:
1672                                 if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1673                                         cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1674                                 else
1675                                         return -EINVAL;
1676                                 if (arg) {
1677                                         int i;
1678                                         char *p;
1679                                         if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1680                                                 return -EFAULT;
1681                                         iocts.drvid[sizeof(iocts.drvid)-1] = 0;
1682                                         if (strlen(iocts.drvid)) {
1683                                                 if ((p = strchr(iocts.drvid, ',')))
1684                                                         *p = 0;
1685                                                 drvidx = -1;
1686                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1687                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1688                                                                 drvidx = i;
1689                                                                 break;
1690                                                         }
1691                                         } else
1692                                                 drvidx = 0;
1693                                         if (drvidx == -1)
1694                                                 return -ENODEV;
1695                                         if (!access_ok(VERIFY_WRITE, argp,
1696                                              sizeof(isdn_ioctl_struct)))
1697                                                 return -EFAULT;
1698                                         c.driver = drvidx;
1699                                         c.command = ISDN_CMD_IOCTL;
1700                                         c.arg = cmd;
1701                                         memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1702                                         ret = isdn_command(&c);
1703                                         memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1704                                         if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1705                                                 return -EFAULT;
1706                                         return ret;
1707                                 } else
1708                                         return -EINVAL;
1709                 }
1710         }
1711 #ifdef CONFIG_ISDN_PPP
1712         if (minor <= ISDN_MINOR_PPPMAX)
1713                 return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1714 #endif
1715         return -ENODEV;
1716
1717 #undef name
1718 #undef bname
1719 #undef iocts
1720 #undef phone
1721 #undef cfg
1722 }
1723
1724 /*
1725  * Open the device code.
1726  */
1727 static int
1728 isdn_open(struct inode *ino, struct file *filep)
1729 {
1730         uint minor = iminor(ino);
1731         int drvidx;
1732         int chidx;
1733         int retval = -ENODEV;
1734
1735
1736         if (minor == ISDN_MINOR_STATUS) {
1737                 infostruct *p;
1738
1739                 if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1740                         p->next = (char *) dev->infochain;
1741                         p->private = (char *) &(filep->private_data);
1742                         dev->infochain = p;
1743                         /* At opening we allow a single update */
1744                         filep->private_data = (char *) 1;
1745                         retval = 0;
1746                         goto out;
1747                 } else {
1748                         retval = -ENOMEM;
1749                         goto out;
1750                 }
1751         }
1752         if (!dev->channels)
1753                 goto out;
1754         if (minor <= ISDN_MINOR_BMAX) {
1755                 printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1756                 drvidx = isdn_minor2drv(minor);
1757                 if (drvidx < 0)
1758                         goto out;
1759                 chidx = isdn_minor2chan(minor);
1760                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1761                         goto out;
1762                 if (!(dev->drv[drvidx]->online & (1 << chidx)))
1763                         goto out;
1764                 isdn_lock_drivers();
1765                 retval = 0;
1766                 goto out;
1767         }
1768         if (minor <= ISDN_MINOR_CTRLMAX) {
1769                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1770                 if (drvidx < 0)
1771                         goto out;
1772                 isdn_lock_drivers();
1773                 retval = 0;
1774                 goto out;
1775         }
1776 #ifdef CONFIG_ISDN_PPP
1777         if (minor <= ISDN_MINOR_PPPMAX) {
1778                 retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1779                 if (retval == 0)
1780                         isdn_lock_drivers();
1781                 goto out;
1782         }
1783 #endif
1784  out:
1785         nonseekable_open(ino, filep);
1786         return retval;
1787 }
1788
1789 static int
1790 isdn_close(struct inode *ino, struct file *filep)
1791 {
1792         uint minor = iminor(ino);
1793
1794         lock_kernel();
1795         if (minor == ISDN_MINOR_STATUS) {
1796                 infostruct *p = dev->infochain;
1797                 infostruct *q = NULL;
1798
1799                 while (p) {
1800                         if (p->private == (char *) &(filep->private_data)) {
1801                                 if (q)
1802                                         q->next = p->next;
1803                                 else
1804                                         dev->infochain = (infostruct *) (p->next);
1805                                 kfree(p);
1806                                 goto out;
1807                         }
1808                         q = p;
1809                         p = (infostruct *) (p->next);
1810                 }
1811                 printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1812                 goto out;
1813         }
1814         isdn_unlock_drivers();
1815         if (minor <= ISDN_MINOR_BMAX)
1816                 goto out;
1817         if (minor <= ISDN_MINOR_CTRLMAX) {
1818                 if (dev->profd == current)
1819                         dev->profd = NULL;
1820                 goto out;
1821         }
1822 #ifdef CONFIG_ISDN_PPP
1823         if (minor <= ISDN_MINOR_PPPMAX)
1824                 isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1825 #endif
1826
1827  out:
1828         unlock_kernel();
1829         return 0;
1830 }
1831
1832 static const struct file_operations isdn_fops =
1833 {
1834         .owner          = THIS_MODULE,
1835         .llseek         = no_llseek,
1836         .read           = isdn_read,
1837         .write          = isdn_write,
1838         .poll           = isdn_poll,
1839         .ioctl          = isdn_ioctl,
1840         .open           = isdn_open,
1841         .release        = isdn_close,
1842 };
1843
1844 char *
1845 isdn_map_eaz2msn(char *msn, int di)
1846 {
1847         isdn_driver_t *this = dev->drv[di];
1848         int i;
1849
1850         if (strlen(msn) == 1) {
1851                 i = msn[0] - '0';
1852                 if ((i >= 0) && (i <= 9))
1853                         if (strlen(this->msn2eaz[i]))
1854                                 return (this->msn2eaz[i]);
1855         }
1856         return (msn);
1857 }
1858
1859 /*
1860  * Find an unused ISDN-channel, whose feature-flags match the
1861  * given L2- and L3-protocols.
1862  */
1863 #define L2V (~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038))
1864
1865 /*
1866  * This function must be called with holding the dev->lock.
1867  */
1868 int
1869 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1870                       ,int pre_chan, char *msn)
1871 {
1872         int i;
1873         ulong features;
1874         ulong vfeatures;
1875
1876         features = ((1 << l2_proto) | (0x10000 << l3_proto));
1877         vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1878                      ~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038));
1879         /* If Layer-2 protocol is V.110, accept drivers with
1880          * transparent feature even if these don't support V.110
1881          * because we can emulate this in linklevel.
1882          */
1883         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1884                 if (USG_NONE(dev->usage[i]) &&
1885                     (dev->drvmap[i] != -1)) {
1886                         int d = dev->drvmap[i];
1887                         if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1888                         ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1889                                 continue;
1890                         if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1891                                 continue;
1892                         if (dev->usage[i] & ISDN_USAGE_DISABLED)
1893                                 continue; /* usage not allowed */
1894                         if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1895                                 if (((dev->drv[d]->interface->features & features) == features) ||
1896                                     (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1897                                      (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1898                                         if ((pre_dev < 0) || (pre_chan < 0)) {
1899                                                 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1900                                                 dev->usage[i] |= usage;
1901                                                 isdn_info_update();
1902                                                 return i;
1903                                         } else {
1904                                                 if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1905                                                         dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1906                                                         dev->usage[i] |= usage;
1907                                                         isdn_info_update();
1908                                                         return i;
1909                                                 }
1910                                         }
1911                                 }
1912                         }
1913                 }
1914         return -1;
1915 }
1916
1917 /*
1918  * Set state of ISDN-channel to 'unused'
1919  */
1920 void
1921 isdn_free_channel(int di, int ch, int usage)
1922 {
1923         int i;
1924
1925         if ((di < 0) || (ch < 0)) {
1926                 printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1927                         __func__, di, ch);
1928                 return;
1929         }
1930         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1931                 if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1932                     (dev->drvmap[i] == di) &&
1933                     (dev->chanmap[i] == ch)) {
1934                         dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1935                         strcpy(dev->num[i], "???");
1936                         dev->ibytes[i] = 0;
1937                         dev->obytes[i] = 0;
1938 // 20.10.99 JIM, try to reinitialize v110 !
1939                         dev->v110emu[i] = 0;
1940                         atomic_set(&(dev->v110use[i]), 0);
1941                         isdn_v110_close(dev->v110[i]);
1942                         dev->v110[i] = NULL;
1943 // 20.10.99 JIM, try to reinitialize v110 !
1944                         isdn_info_update();
1945                         if (dev->drv[di])
1946                                 skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1947                 }
1948 }
1949
1950 /*
1951  * Cancel Exclusive-Flag for ISDN-channel
1952  */
1953 void
1954 isdn_unexclusive_channel(int di, int ch)
1955 {
1956         int i;
1957
1958         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1959                 if ((dev->drvmap[i] == di) &&
1960                     (dev->chanmap[i] == ch)) {
1961                         dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1962                         isdn_info_update();
1963                         return;
1964                 }
1965 }
1966
1967 /*
1968  *  writebuf replacement for SKB_ABLE drivers
1969  */
1970 static int
1971 isdn_writebuf_stub(int drvidx, int chan, const u_char __user * buf, int len)
1972 {
1973         int ret;
1974         int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1975         struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1976
1977         if (!skb)
1978                 return -ENOMEM;
1979         skb_reserve(skb, hl);
1980         if (copy_from_user(skb_put(skb, len), buf, len)) {
1981                 dev_kfree_skb(skb);
1982                 return -EFAULT;
1983         }
1984         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1985         if (ret <= 0)
1986                 dev_kfree_skb(skb);
1987         if (ret > 0)
1988                 dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1989         return ret;
1990 }
1991
1992 /*
1993  * Return: length of data on success, -ERRcode on failure.
1994  */
1995 int
1996 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
1997 {
1998         int ret;
1999         struct sk_buff *nskb = NULL;
2000         int v110_ret = skb->len;
2001         int idx = isdn_dc2minor(drvidx, chan);
2002
2003         if (dev->v110[idx]) {
2004                 atomic_inc(&dev->v110use[idx]);
2005                 nskb = isdn_v110_encode(dev->v110[idx], skb);
2006                 atomic_dec(&dev->v110use[idx]);
2007                 if (!nskb)
2008                         return 0;
2009                 v110_ret = *((int *)nskb->data);
2010                 skb_pull(nskb, sizeof(int));
2011                 if (!nskb->len) {
2012                         dev_kfree_skb(nskb);
2013                         return v110_ret;
2014                 }
2015                 /* V.110 must always be acknowledged */
2016                 ack = 1;
2017                 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2018         } else {
2019                 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2020
2021                 if( skb_headroom(skb) < hl ){
2022                         /*
2023                          * This should only occur when new HL driver with
2024                          * increased hl_hdrlen was loaded after netdevice
2025                          * was created and connected to the new driver.
2026                          *
2027                          * The V.110 branch (re-allocates on its own) does
2028                          * not need this
2029                          */
2030                         struct sk_buff * skb_tmp;
2031
2032                         skb_tmp = skb_realloc_headroom(skb, hl);
2033                         printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2034                         if (!skb_tmp) return -ENOMEM; /* 0 better? */
2035                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2036                         if( ret > 0 ){
2037                                 dev_kfree_skb(skb);
2038                         } else {
2039                                 dev_kfree_skb(skb_tmp);
2040                         }
2041                 } else {
2042                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2043                 }
2044         }
2045         if (ret > 0) {
2046                 dev->obytes[idx] += ret;
2047                 if (dev->v110[idx]) {
2048                         atomic_inc(&dev->v110use[idx]);
2049                         dev->v110[idx]->skbuser++;
2050                         atomic_dec(&dev->v110use[idx]);
2051                         /* For V.110 return unencoded data length */
2052                         ret = v110_ret;
2053                         /* if the complete frame was send we free the skb;
2054                            if not upper function will requeue the skb */
2055                         if (ret == skb->len)
2056                                 dev_kfree_skb(skb);
2057                 }
2058         } else
2059                 if (dev->v110[idx])
2060                         dev_kfree_skb(nskb);
2061         return ret;
2062 }
2063
2064 static int
2065 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2066 {
2067         int j, k, m;
2068
2069         init_waitqueue_head(&d->st_waitq);
2070         if (d->flags & DRV_FLAG_RUNNING)
2071                 return -1;
2072         if (n < 1) return 0;
2073
2074         m = (adding) ? d->channels + n : n;
2075
2076         if (dev->channels + n > ISDN_MAX_CHANNELS) {
2077                 printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2078                        ISDN_MAX_CHANNELS);
2079                 return -1;
2080         }
2081
2082         if ((adding) && (d->rcverr))
2083                 kfree(d->rcverr);
2084         if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2085                 printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2086                 return -1;
2087         }
2088
2089         if ((adding) && (d->rcvcount))
2090                 kfree(d->rcvcount);
2091         if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2092                 printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2093                 if (!adding)
2094                         kfree(d->rcverr);
2095                 return -1;
2096         }
2097
2098         if ((adding) && (d->rpqueue)) {
2099                 for (j = 0; j < d->channels; j++)
2100                         skb_queue_purge(&d->rpqueue[j]);
2101                 kfree(d->rpqueue);
2102         }
2103         if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
2104                 printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2105                 if (!adding) {
2106                         kfree(d->rcvcount);
2107                         kfree(d->rcverr);
2108                 }
2109                 return -1;
2110         }
2111         for (j = 0; j < m; j++) {
2112                 skb_queue_head_init(&d->rpqueue[j]);
2113         }
2114
2115         if ((adding) && (d->rcv_waitq))
2116                 kfree(d->rcv_waitq);
2117         d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
2118         if (!d->rcv_waitq) {
2119                 printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2120                 if (!adding) {
2121                         kfree(d->rpqueue);
2122                         kfree(d->rcvcount);
2123                         kfree(d->rcverr);
2124                 }
2125                 return -1;
2126         }
2127         d->snd_waitq = d->rcv_waitq + m;
2128         for (j = 0; j < m; j++) {
2129                 init_waitqueue_head(&d->rcv_waitq[j]);
2130                 init_waitqueue_head(&d->snd_waitq[j]);
2131         }
2132
2133         dev->channels += n;
2134         for (j = d->channels; j < m; j++)
2135                 for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2136                         if (dev->chanmap[k] < 0) {
2137                                 dev->chanmap[k] = j;
2138                                 dev->drvmap[k] = drvidx;
2139                                 break;
2140                         }
2141         d->channels = m;
2142         return 0;
2143 }
2144
2145 /*
2146  * Low-level-driver registration
2147  */
2148
2149 static void
2150 set_global_features(void)
2151 {
2152         int drvidx;
2153
2154         dev->global_features = 0;
2155         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2156                 if (!dev->drv[drvidx])
2157                         continue;
2158                 if (dev->drv[drvidx]->interface)
2159                         dev->global_features |= dev->drv[drvidx]->interface->features;
2160         }
2161 }
2162
2163 #ifdef CONFIG_ISDN_DIVERSION
2164
2165 static char *map_drvname(int di)
2166 {
2167   if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2168     return(NULL);
2169   return(dev->drvid[di]); /* driver name */
2170 } /* map_drvname */
2171
2172 static int map_namedrv(char *id)
2173 {  int i;
2174
2175    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2176     { if (!strcmp(dev->drvid[i],id))
2177         return(i);
2178     }
2179    return(-1);
2180 } /* map_namedrv */
2181
2182 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2183 {
2184   if (i_div->if_magic != DIVERT_IF_MAGIC)
2185     return(DIVERT_VER_ERR);
2186   switch (i_div->cmd)
2187     {
2188       case DIVERT_CMD_REL:
2189         if (divert_if != i_div)
2190           return(DIVERT_REL_ERR);
2191         divert_if = NULL; /* free interface */
2192         return(DIVERT_NO_ERR);
2193
2194       case DIVERT_CMD_REG:
2195         if (divert_if)
2196           return(DIVERT_REG_ERR);
2197         i_div->ll_cmd = isdn_command; /* set command function */
2198         i_div->drv_to_name = map_drvname;
2199         i_div->name_to_drv = map_namedrv;
2200         divert_if = i_div; /* remember interface */
2201         return(DIVERT_NO_ERR);
2202
2203       default:
2204         return(DIVERT_CMD_ERR);
2205     }
2206 } /* DIVERT_REG_NAME */
2207
2208 EXPORT_SYMBOL(DIVERT_REG_NAME);
2209
2210 #endif /* CONFIG_ISDN_DIVERSION */
2211
2212
2213 EXPORT_SYMBOL(register_isdn);
2214 #ifdef CONFIG_ISDN_PPP
2215 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2216 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2217 #endif
2218
2219 int
2220 register_isdn(isdn_if * i)
2221 {
2222         isdn_driver_t *d;
2223         int j;
2224         ulong flags;
2225         int drvidx;
2226
2227         if (dev->drivers >= ISDN_MAX_DRIVERS) {
2228                 printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2229                        ISDN_MAX_DRIVERS);
2230                 return 0;
2231         }
2232         if (!i->writebuf_skb) {
2233                 printk(KERN_WARNING "register_isdn: No write routine given.\n");
2234                 return 0;
2235         }
2236         if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2237                 printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2238                 return 0;
2239         }
2240
2241         d->maxbufsize = i->maxbufsize;
2242         d->pktcount = 0;
2243         d->stavail = 0;
2244         d->flags = DRV_FLAG_LOADED;
2245         d->online = 0;
2246         d->interface = i;
2247         d->channels = 0;
2248         spin_lock_irqsave(&dev->lock, flags);
2249         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2250                 if (!dev->drv[drvidx])
2251                         break;
2252         if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2253                 spin_unlock_irqrestore(&dev->lock, flags);
2254                 kfree(d);
2255                 return 0;
2256         }
2257         i->channels = drvidx;
2258         i->rcvcallb_skb = isdn_receive_skb_callback;
2259         i->statcallb = isdn_status_callback;
2260         if (!strlen(i->id))
2261                 sprintf(i->id, "line%d", drvidx);
2262         for (j = 0; j < drvidx; j++)
2263                 if (!strcmp(i->id, dev->drvid[j]))
2264                         sprintf(i->id, "line%d", drvidx);
2265         dev->drv[drvidx] = d;
2266         strcpy(dev->drvid[drvidx], i->id);
2267         isdn_info_update();
2268         dev->drivers++;
2269         set_global_features();
2270         spin_unlock_irqrestore(&dev->lock, flags);
2271         return 1;
2272 }
2273
2274 /*
2275  *****************************************************************************
2276  * And now the modules code.
2277  *****************************************************************************
2278  */
2279
2280 static char *
2281 isdn_getrev(const char *revision)
2282 {
2283         char *rev;
2284         char *p;
2285
2286         if ((p = strchr(revision, ':'))) {
2287                 rev = p + 2;
2288                 p = strchr(rev, '$');
2289                 *--p = 0;
2290         } else
2291                 rev = "???";
2292         return rev;
2293 }
2294
2295 /*
2296  * Allocate and initialize all data, register modem-devices
2297  */
2298 static int __init isdn_init(void)
2299 {
2300         int i;
2301         char tmprev[50];
2302
2303         if (!(dev = vmalloc(sizeof(isdn_dev)))) {
2304                 printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2305                 return -EIO;
2306         }
2307         memset((char *) dev, 0, sizeof(isdn_dev));
2308         init_timer(&dev->timer);
2309         dev->timer.function = isdn_timer_funct;
2310         spin_lock_init(&dev->lock);
2311         spin_lock_init(&dev->timerlock);
2312 #ifdef MODULE
2313         dev->owner = THIS_MODULE;
2314 #endif
2315         mutex_init(&dev->mtx);
2316         init_waitqueue_head(&dev->info_waitq);
2317         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2318                 dev->drvmap[i] = -1;
2319                 dev->chanmap[i] = -1;
2320                 dev->m_idx[i] = -1;
2321                 strcpy(dev->num[i], "???");
2322                 init_waitqueue_head(&dev->mdm.info[i].open_wait);
2323                 init_waitqueue_head(&dev->mdm.info[i].close_wait);
2324         }
2325         if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2326                 printk(KERN_WARNING "isdn: Could not register control devices\n");
2327                 vfree(dev);
2328                 return -EIO;
2329         }
2330         if ((isdn_tty_modem_init()) < 0) {
2331                 printk(KERN_WARNING "isdn: Could not register tty devices\n");
2332                 vfree(dev);
2333                 unregister_chrdev(ISDN_MAJOR, "isdn");
2334                 return -EIO;
2335         }
2336 #ifdef CONFIG_ISDN_PPP
2337         if (isdn_ppp_init() < 0) {
2338                 printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2339                 isdn_tty_exit();
2340                 unregister_chrdev(ISDN_MAJOR, "isdn");
2341                 vfree(dev);
2342                 return -EIO;
2343         }
2344 #endif                          /* CONFIG_ISDN_PPP */
2345
2346         strcpy(tmprev, isdn_revision);
2347         printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2348         strcpy(tmprev, isdn_tty_revision);
2349         printk("%s/", isdn_getrev(tmprev));
2350         strcpy(tmprev, isdn_net_revision);
2351         printk("%s/", isdn_getrev(tmprev));
2352         strcpy(tmprev, isdn_ppp_revision);
2353         printk("%s/", isdn_getrev(tmprev));
2354         strcpy(tmprev, isdn_audio_revision);
2355         printk("%s/", isdn_getrev(tmprev));
2356         strcpy(tmprev, isdn_v110_revision);
2357         printk("%s", isdn_getrev(tmprev));
2358
2359 #ifdef MODULE
2360         printk(" loaded\n");
2361 #else
2362         printk("\n");
2363 #endif
2364         isdn_info_update();
2365         return 0;
2366 }
2367
2368 /*
2369  * Unload module
2370  */
2371 static void __exit isdn_exit(void)
2372 {
2373 #ifdef CONFIG_ISDN_PPP
2374         isdn_ppp_cleanup();
2375 #endif
2376         if (isdn_net_rmall() < 0) {
2377                 printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2378                 return;
2379         }
2380         isdn_tty_exit();
2381         unregister_chrdev(ISDN_MAJOR, "isdn");
2382         del_timer(&dev->timer);
2383         /* call vfree with interrupts enabled, else it will hang */
2384         vfree(dev);
2385         printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2386 }
2387
2388 module_init(isdn_init);
2389 module_exit(isdn_exit);