drivers/isdn/i4l/isdn_common.c

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