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 (fritz@isdn4linux.de)
   6  * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/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 extern char *isdn_tty_revision;
  50 #ifdef CONFIG_ISDN_PPP
  51 extern char *isdn_ppp_revision;
  52 #else
  53 static char *isdn_ppp_revision = ": none $";
  54 #endif
  55 #ifdef CONFIG_ISDN_AUDIO
  56 extern char *isdn_audio_revision;
  57 #else
  58 static char *isdn_audio_revision = ": none $";
  59 #endif
  60 extern char *isdn_v110_revision;
  61
  62 #ifdef CONFIG_ISDN_DIVERSION
  63 static isdn_divert_if *divert_if; /* = NULL */
  64 #endif /* CONFIG_ISDN_DIVERSION */
  65
  66
  67 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
  68 static void set_global_features(void);
  69 static int isdn_wildmat(char *s, char *p);
  70 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
  71
  72 static inline void
  73 isdn_lock_driver(isdn_driver_t *drv)
  74 {
  75         try_module_get(drv->interface->owner);
  76         drv->locks++;
  77 }
  78
  79 void
  80 isdn_lock_drivers(void)
  81 {
  82         int i;
  83
  84         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
  85                 if (!dev->drv[i])
  86                         continue;
  87                 isdn_lock_driver(dev->drv[i]);
  88         }
  89 }
  90
  91 static inline void
  92 isdn_unlock_driver(isdn_driver_t *drv)
  93 {
  94         if (drv->locks > 0) {
  95                 drv->locks--;
  96                 module_put(drv->interface->owner);
  97         }
  98 }
  99
 100 void
 101 isdn_unlock_drivers(void)
 102 {
 103         int i;
 104
 105         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
 106                 if (!dev->drv[i])
 107                         continue;
 108                 isdn_unlock_driver(dev->drv[i]);
 109         }
 110 }
 111
 112 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
 113 void
 114 isdn_dumppkt(char *s, u_char *p, int len, int dumplen)
 115 {
 116         int dumpc;
 117
 118         printk(KERN_DEBUG "%s(%d) ", s, len);
 119         for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
 120                 printk(" %02x", *p++);
 121         printk("\n");
 122 }
 123 #endif
 124
 125 /*
 126  * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 127  * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
 128  */
 129 static int
 130 isdn_star(char *s, char *p)
 131 {
 132         while (isdn_wildmat(s, p)) {
 133                 if (*++s == '\0')
 134                         return (2);
 135         }
 136         return (0);
 137 }
 138
 139 /*
 140  * Shell-type Pattern-matching for incoming caller-Ids
 141  * This function gets a string in s and checks, if it matches the pattern
 142  * given in p.
 143  *
 144  * Return:
 145  *   0 = match.
 146  *   1 = no match.
 147  *   2 = no match. Would eventually match, if s would be longer.
 148  *
 149  * Possible Patterns:
 150  *
 151  * '?'     matches one character
 152  * '*'     matches zero or more characters
 153  * [xyz]   matches the set of characters in brackets.
 154  * [^xyz]  matches any single character not in the set of characters
 155  */
 156
 157 static int
 158 isdn_wildmat(char *s, char *p)
 159 {
 160         register int last;
 161         register int matched;
 162         register int reverse;
 163         register int nostar = 1;
 164
 165         if (!(*s) && !(*p))
 166                 return (1);
 167         for (; *p; s++, p++)
 168                 switch (*p) {
 169                 case '\\':
 170                         /*
 171                          * Literal match with following character,
 172                          * fall through.
 173                          */
 174                         p++;
 175                 default:
 176                         if (*s != *p)
 177                                 return (*s == '\0') ? 2 : 1;
 178                                         continue;
 179                 case '?':
 180                         /* Match anything. */
 181                         if (*s == '\0')
 182                                 return (2);
 183                         continue;
 184                 case '*':
 185                         nostar = 0;
 186                         /* Trailing star matches everything. */
 187                         return (*++p ? isdn_star(s, p) : 0);
 188                 case '[':
 189                         /* [^....] means inverse character class. */
 190                         if ((reverse = (p[1] == '^')))
 191                                 p++;
 192                         for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
 193                                 /* This next line requires a good C compiler. */
 194                                 if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
 195                                         matched = 1;
 196                         if (matched == reverse)
 197                                 return (1);
 198                         continue;
 199                 }
 200         return (*s == '\0') ? 0 : nostar;
 201 }
 202
 203 int isdn_msncmp(const char *msn1, const char *msn2)
 204 {
 205         char TmpMsn1[ISDN_MSNLEN];
 206         char TmpMsn2[ISDN_MSNLEN];
 207         char *p;
 208
 209         for (p = TmpMsn1; *msn1 && *msn1 != ':';)  // Strip off a SPID
 210                 *p++ = *msn1++;
 211         *p = '\0';
 212
 213         for (p = TmpMsn2; *msn2 && *msn2 != ':';)  // Strip off a SPID
 214                 *p++ = *msn2++;
 215         *p = '\0';
 216
 217         return isdn_wildmat(TmpMsn1, TmpMsn2);
 218 }
 219
 220 int
 221 isdn_dc2minor(int di, int ch)
 222 {
 223         int i;
 224         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 225                 if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
 226                         return i;
 227         return -1;
 228 }
 229
 230 static int isdn_timer_cnt1 = 0;
 231 static int isdn_timer_cnt2 = 0;
 232 static int isdn_timer_cnt3 = 0;
 233
 234 static void
 235 isdn_timer_funct(ulong dummy)
 236 {
 237         int tf = dev->tflags;
 238         if (tf & ISDN_TIMER_FAST) {
 239                 if (tf & ISDN_TIMER_MODEMREAD)
 240                         isdn_tty_readmodem();
 241                 if (tf & ISDN_TIMER_MODEMPLUS)
 242                         isdn_tty_modem_escape();
 243                 if (tf & ISDN_TIMER_MODEMXMIT)
 244                         isdn_tty_modem_xmit();
 245         }
 246         if (tf & ISDN_TIMER_SLOW) {
 247                 if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
 248                         isdn_timer_cnt1 = 0;
 249                         if (tf & ISDN_TIMER_NETDIAL)
 250                                 isdn_net_dial();
 251                 }
 252                 if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
 253                         isdn_timer_cnt2 = 0;
 254                         if (tf & ISDN_TIMER_NETHANGUP)
 255                                 isdn_net_autohup();
 256                         if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
 257                                 isdn_timer_cnt3 = 0;
 258                                 if (tf & ISDN_TIMER_MODEMRING)
 259                                         isdn_tty_modem_ring();
 260                         }
 261                         if (tf & ISDN_TIMER_CARRIER)
 262                                 isdn_tty_carrier_timeout();
 263                 }
 264         }
 265         if (tf)
 266                 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
 267 }
 268
 269 void
 270 isdn_timer_ctrl(int tf, int onoff)
 271 {
 272         unsigned long flags;
 273         int old_tflags;
 274
 275         spin_lock_irqsave(&dev->timerlock, flags);
 276         if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
 277                 /* If the slow-timer wasn't activated until now */
 278                 isdn_timer_cnt1 = 0;
 279                 isdn_timer_cnt2 = 0;
 280         }
 281         old_tflags = dev->tflags;
 282         if (onoff)
 283                 dev->tflags |= tf;
 284         else
 285                 dev->tflags &= ~tf;
 286         if (dev->tflags && !old_tflags)
 287                 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
 288         spin_unlock_irqrestore(&dev->timerlock, flags);
 289 }
 290
 291 /*
 292  * Receive a packet from B-Channel. (Called from low-level-module)
 293  */
 294 static void
 295 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
 296 {
 297         int i;
 298
 299         if ((i = isdn_dc2minor(di, channel)) == -1) {
 300                 dev_kfree_skb(skb);
 301                 return;
 302         }
 303         /* Update statistics */
 304         dev->ibytes[i] += skb->len;
 305
 306         /* First, try to deliver data to network-device */
 307         if (isdn_net_rcv_skb(i, skb))
 308                 return;
 309
 310         /* V.110 handling
 311          * makes sense for async streams only, so it is
 312          * called after possible net-device delivery.
 313          */
 314         if (dev->v110[i]) {
 315                 atomic_inc(&dev->v110use[i]);
 316                 skb = isdn_v110_decode(dev->v110[i], skb);
 317                 atomic_dec(&dev->v110use[i]);
 318                 if (!skb)
 319                         return;
 320         }
 321
 322         /* No network-device found, deliver to tty or raw-channel */
 323         if (skb->len) {
 324                 if (isdn_tty_rcv_skb(i, di, channel, skb))
 325                         return;
 326                 wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
 327         } else
 328                 dev_kfree_skb(skb);
 329 }
 330
 331 /*
 332  * Intercept command from Linklevel to Lowlevel.
 333  * If layer 2 protocol is V.110 and this is not supported by current
 334  * lowlevel-driver, use driver's transparent mode and handle V.110 in
 335  * linklevel instead.
 336  */
 337 int
 338 isdn_command(isdn_ctrl *cmd)
 339 {
 340         if (cmd->driver == -1) {
 341                 printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
 342                 return (1);
 343         }
 344         if (!dev->drv[cmd->driver]) {
 345                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
 346                        cmd->command, cmd->driver);
 347                 return (1);
 348         }
 349         if (!dev->drv[cmd->driver]->interface) {
 350                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
 351                        cmd->command, cmd->driver);
 352                 return (1);
 353         }
 354         if (cmd->command == ISDN_CMD_SETL2) {
 355                 int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
 356                 unsigned long l2prot = (cmd->arg >> 8) & 255;
 357                 unsigned long features = (dev->drv[cmd->driver]->interface->features
 358                                           >> ISDN_FEATURE_L2_SHIFT) &
 359                         ISDN_FEATURE_L2_MASK;
 360                 unsigned long l2_feature = (1 << l2prot);
 361
 362                 switch (l2prot) {
 363                 case ISDN_PROTO_L2_V11096:
 364                 case ISDN_PROTO_L2_V11019:
 365                 case ISDN_PROTO_L2_V11038:
 366                         /* If V.110 requested, but not supported by
 367                          * HL-driver, set emulator-flag and change
 368                          * Layer-2 to transparent
 369                          */
 370                         if (!(features & l2_feature)) {
 371                                 dev->v110emu[idx] = l2prot;
 372                                 cmd->arg = (cmd->arg & 255) |
 373                                         (ISDN_PROTO_L2_TRANS << 8);
 374                         } else
 375                                 dev->v110emu[idx] = 0;
 376                 }
 377         }
 378         return dev->drv[cmd->driver]->interface->command(cmd);
 379 }
 380
 381 void
 382 isdn_all_eaz(int di, int ch)
 383 {
 384         isdn_ctrl cmd;
 385
 386         if (di < 0)
 387                 return;
 388         cmd.driver = di;
 389         cmd.arg = ch;
 390         cmd.command = ISDN_CMD_SETEAZ;
 391         cmd.parm.num[0] = '\0';
 392         isdn_command(&cmd);
 393 }
 394
 395 /*
 396  * Begin of a CAPI like LL<->HL interface, currently used only for
 397  * supplementary service (CAPI 2.0 part III)
 398  */
 399 #include <linux/isdn/capicmd.h>
 400
 401 static int
 402 isdn_capi_rec_hl_msg(capi_msg *cm)
 403 {
 404         switch (cm->Command) {
 405         case CAPI_FACILITY:
 406                 /* in the moment only handled in tty */
 407                 return (isdn_tty_capi_facility(cm));
 408         default:
 409                 return (-1);
 410         }
 411 }
 412
 413 static int
 414 isdn_status_callback(isdn_ctrl *c)
 415 {
 416         int di;
 417         u_long flags;
 418         int i;
 419         int r;
 420         int retval = 0;
 421         isdn_ctrl cmd;
 422         isdn_net_dev *p;
 423
 424         di = c->driver;
 425         i = isdn_dc2minor(di, c->arg);
 426         switch (c->command) {
 427         case ISDN_STAT_BSENT:
 428                 if (i < 0)
 429                         return -1;
 430                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 431                         return 0;
 432                 if (isdn_net_stat_callback(i, c))
 433                         return 0;
 434                 if (isdn_v110_stat_callback(i, c))
 435                         return 0;
 436                 if (isdn_tty_stat_callback(i, c))
 437                         return 0;
 438                 wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
 439                 break;
 440         case ISDN_STAT_STAVAIL:
 441                 dev->drv[di]->stavail += c->arg;
 442                 wake_up_interruptible(&dev->drv[di]->st_waitq);
 443                 break;
 444         case ISDN_STAT_RUN:
 445                 dev->drv[di]->flags |= DRV_FLAG_RUNNING;
 446                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 447                         if (dev->drvmap[i] == di)
 448                                 isdn_all_eaz(di, dev->chanmap[i]);
 449                 set_global_features();
 450                 break;
 451         case ISDN_STAT_STOP:
 452                 dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
 453                 break;
 454         case ISDN_STAT_ICALL:
 455                 if (i < 0)
 456                         return -1;
 457 #ifdef ISDN_DEBUG_STATCALLB
 458                 printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
 459 #endif
 460                 if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
 461                         cmd.driver = di;
 462                         cmd.arg = c->arg;
 463                         cmd.command = ISDN_CMD_HANGUP;
 464                         isdn_command(&cmd);
 465                         return 0;
 466                 }
 467                 /* Try to find a network-interface which will accept incoming call */
 468                 r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
 469                 switch (r) {
 470                 case 0:
 471                         /* No network-device replies.
 472                          * Try ttyI's.
 473                          * These return 0 on no match, 1 on match and
 474                          * 3 on eventually match, if CID is longer.
 475                          */
 476                         if (c->command == ISDN_STAT_ICALL)
 477                                 if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return (retval);
 478 #ifdef CONFIG_ISDN_DIVERSION
 479                         if (divert_if)
 480                                 if ((retval = divert_if->stat_callback(c)))
 481                                         return (retval); /* processed */
 482 #endif /* CONFIG_ISDN_DIVERSION */
 483                         if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
 484                                 /* No tty responding */
 485                                 cmd.driver = di;
 486                                 cmd.arg = c->arg;
 487                                 cmd.command = ISDN_CMD_HANGUP;
 488                                 isdn_command(&cmd);
 489                                 retval = 2;
 490                         }
 491                         break;
 492                 case 1:
 493                         /* Schedule connection-setup */
 494                         isdn_net_dial();
 495                         cmd.driver = di;
 496                         cmd.arg = c->arg;
 497                         cmd.command = ISDN_CMD_ACCEPTD;
 498                         for (p = dev->netdev; p; p = p->next)
 499                                 if (p->local->isdn_channel == cmd.arg)
 500                                 {
 501                                         strcpy(cmd.parm.setup.eazmsn, p->local->msn);
 502                                         isdn_command(&cmd);
 503                                         retval = 1;
 504                                         break;
 505                                 }
 506                         break;
 507
 508                 case 2: /* For calling back, first reject incoming call ... */
 509                 case 3: /* Interface found, but down, reject call actively  */
 510                         retval = 2;
 511                         printk(KERN_INFO "isdn: Rejecting Call\n");
 512                         cmd.driver = di;
 513                         cmd.arg = c->arg;
 514                         cmd.command = ISDN_CMD_HANGUP;
 515                         isdn_command(&cmd);
 516                         if (r == 3)
 517                                 break;
 518                         /* Fall through */
 519                 case 4:
 520                         /* ... then start callback. */
 521                         isdn_net_dial();
 522                         break;
 523                 case 5:
 524                         /* Number would eventually match, if longer */
 525                         retval = 3;
 526                         break;
 527                 }
 528 #ifdef ISDN_DEBUG_STATCALLB
 529                 printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
 530 #endif
 531                 return retval;
 532                 break;
 533         case ISDN_STAT_CINF:
 534                 if (i < 0)
 535                         return -1;
 536 #ifdef ISDN_DEBUG_STATCALLB
 537                 printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
 538 #endif
 539                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 540                         return 0;
 541                 if (strcmp(c->parm.num, "0"))
 542                         isdn_net_stat_callback(i, c);
 543                 isdn_tty_stat_callback(i, c);
 544                 break;
 545         case ISDN_STAT_CAUSE:
 546 #ifdef ISDN_DEBUG_STATCALLB
 547                 printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
 548 #endif
 549                 printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
 550                        dev->drvid[di], c->arg, c->parm.num);
 551                 isdn_tty_stat_callback(i, c);
 552 #ifdef CONFIG_ISDN_DIVERSION
 553                 if (divert_if)
 554                         divert_if->stat_callback(c);
 555 #endif /* CONFIG_ISDN_DIVERSION */
 556                 break;
 557         case ISDN_STAT_DISPLAY:
 558 #ifdef ISDN_DEBUG_STATCALLB
 559                 printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
 560 #endif
 561                 isdn_tty_stat_callback(i, c);
 562 #ifdef CONFIG_ISDN_DIVERSION
 563                 if (divert_if)
 564                         divert_if->stat_callback(c);
 565 #endif /* CONFIG_ISDN_DIVERSION */
 566                 break;
 567         case ISDN_STAT_DCONN:
 568                 if (i < 0)
 569                         return -1;
 570 #ifdef ISDN_DEBUG_STATCALLB
 571                 printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
 572 #endif
 573                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 574                         return 0;
 575                 /* Find any net-device, waiting for D-channel setup */
 576                 if (isdn_net_stat_callback(i, c))
 577                         break;
 578                 isdn_v110_stat_callback(i, c);
 579                 /* Find any ttyI, waiting for D-channel setup */
 580                 if (isdn_tty_stat_callback(i, c)) {
 581                         cmd.driver = di;
 582                         cmd.arg = c->arg;
 583                         cmd.command = ISDN_CMD_ACCEPTB;
 584                         isdn_command(&cmd);
 585                         break;
 586                 }
 587                 break;
 588         case ISDN_STAT_DHUP:
 589                 if (i < 0)
 590                         return -1;
 591 #ifdef ISDN_DEBUG_STATCALLB
 592                 printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
 593 #endif
 594                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 595                         return 0;
 596                 dev->drv[di]->online &= ~(1 << (c->arg));
 597                 isdn_info_update();
 598                 /* Signal hangup to network-devices */
 599                 if (isdn_net_stat_callback(i, c))
 600                         break;
 601                 isdn_v110_stat_callback(i, c);
 602                 if (isdn_tty_stat_callback(i, c))
 603                         break;
 604 #ifdef CONFIG_ISDN_DIVERSION
 605                 if (divert_if)
 606                         divert_if->stat_callback(c);
 607 #endif /* CONFIG_ISDN_DIVERSION */
 608                 break;
 609                 break;
 610         case ISDN_STAT_BCONN:
 611                 if (i < 0)
 612                         return -1;
 613 #ifdef ISDN_DEBUG_STATCALLB
 614                 printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
 615 #endif
 616                 /* Signal B-channel-connect to network-devices */
 617                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 618                         return 0;
 619                 dev->drv[di]->online |= (1 << (c->arg));
 620                 isdn_info_update();
 621                 if (isdn_net_stat_callback(i, c))
 622                         break;
 623                 isdn_v110_stat_callback(i, c);
 624                 if (isdn_tty_stat_callback(i, c))
 625                         break;
 626                 break;
 627         case ISDN_STAT_BHUP:
 628                 if (i < 0)
 629                         return -1;
 630 #ifdef ISDN_DEBUG_STATCALLB
 631                 printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
 632 #endif
 633                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 634                         return 0;
 635                 dev->drv[di]->online &= ~(1 << (c->arg));
 636                 isdn_info_update();
 637 #ifdef CONFIG_ISDN_X25
 638                 /* Signal hangup to network-devices */
 639                 if (isdn_net_stat_callback(i, c))
 640                         break;
 641 #endif
 642                 isdn_v110_stat_callback(i, c);
 643                 if (isdn_tty_stat_callback(i, c))
 644                         break;
 645                 break;
 646         case ISDN_STAT_NODCH:
 647                 if (i < 0)
 648                         return -1;
 649 #ifdef ISDN_DEBUG_STATCALLB
 650                 printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
 651 #endif
 652                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 653                         return 0;
 654                 if (isdn_net_stat_callback(i, c))
 655                         break;
 656                 if (isdn_tty_stat_callback(i, c))
 657                         break;
 658                 break;
 659         case ISDN_STAT_ADDCH:
 660                 spin_lock_irqsave(&dev->lock, flags);
 661                 if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
 662                         spin_unlock_irqrestore(&dev->lock, flags);
 663                         return -1;
 664                 }
 665                 spin_unlock_irqrestore(&dev->lock, flags);
 666                 isdn_info_update();
 667                 break;
 668         case ISDN_STAT_DISCH:
 669                 spin_lock_irqsave(&dev->lock, flags);
 670                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 671                         if ((dev->drvmap[i] == di) &&
 672                             (dev->chanmap[i] == c->arg)) {
 673                                 if (c->parm.num[0])
 674                                         dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 675                                 else
 676                                         if (USG_NONE(dev->usage[i])) {
 677                                                 dev->usage[i] |= ISDN_USAGE_DISABLED;
 678                                         }
 679                                         else
 680                                                 retval = -1;
 681                                 break;
 682                         }
 683                 spin_unlock_irqrestore(&dev->lock, flags);
 684                 isdn_info_update();
 685                 break;
 686         case ISDN_STAT_UNLOAD:
 687                 while (dev->drv[di]->locks > 0) {
 688                         isdn_unlock_driver(dev->drv[di]);
 689                 }
 690                 spin_lock_irqsave(&dev->lock, flags);
 691                 isdn_tty_stat_callback(i, c);
 692                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 693                         if (dev->drvmap[i] == di) {
 694                                 dev->drvmap[i] = -1;
 695                                 dev->chanmap[i] = -1;
 696                                 dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 697                         }
 698                 dev->drivers--;
 699                 dev->channels -= dev->drv[di]->channels;
 700                 kfree(dev->drv[di]->rcverr);
 701                 kfree(dev->drv[di]->rcvcount);
 702                 for (i = 0; i < dev->drv[di]->channels; i++)
 703                         skb_queue_purge(&dev->drv[di]->rpqueue[i]);
 704                 kfree(dev->drv[di]->rpqueue);
 705                 kfree(dev->drv[di]->rcv_waitq);
 706                 kfree(dev->drv[di]);
 707                 dev->drv[di] = NULL;
 708                 dev->drvid[di][0] = '\0';
 709                 isdn_info_update();
 710                 set_global_features();
 711                 spin_unlock_irqrestore(&dev->lock, flags);
 712                 return 0;
 713         case ISDN_STAT_L1ERR:
 714                 break;
 715         case CAPI_PUT_MESSAGE:
 716                 return (isdn_capi_rec_hl_msg(&c->parm.cmsg));
 717 #ifdef CONFIG_ISDN_TTY_FAX
 718         case ISDN_STAT_FAXIND:
 719                 isdn_tty_stat_callback(i, c);
 720                 break;
 721 #endif
 722 #ifdef CONFIG_ISDN_AUDIO
 723         case ISDN_STAT_AUDIO:
 724                 isdn_tty_stat_callback(i, c);
 725                 break;
 726 #endif
 727 #ifdef CONFIG_ISDN_DIVERSION
 728         case ISDN_STAT_PROT:
 729         case ISDN_STAT_REDIR:
 730                 if (divert_if)
 731                         return (divert_if->stat_callback(c));
 732 #endif /* CONFIG_ISDN_DIVERSION */
 733         default:
 734                 return -1;
 735         }
 736         return 0;
 737 }
 738
 739 /*
 740  * Get integer from char-pointer, set pointer to end of number
 741  */
 742 int
 743 isdn_getnum(char **p)
 744 {
 745         int v = -1;
 746
 747         while (*p[0] >= '0' && *p[0] <= '9')
 748                 v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
 749         return v;
 750 }
 751
 752 #define DLE 0x10
 753
 754 /*
 755  * isdn_readbchan() tries to get data from the read-queue.
 756  * It MUST be called with interrupts off.
 757  *
 758  * Be aware that this is not an atomic operation when sleep != 0, even though
 759  * interrupts are turned off! Well, like that we are currently only called
 760  * on behalf of a read system call on raw device files (which are documented
 761  * to be dangerous and for debugging purpose only). The inode semaphore
 762  * takes care that this is not called for the same minor device number while
 763  * we are sleeping, but access is not serialized against simultaneous read()
 764  * from the corresponding ttyI device. Can other ugly events, like changes
 765  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 766  */
 767 int
 768 isdn_readbchan(int di, int channel, u_char *buf, u_char *fp, int len, wait_queue_head_t *sleep)
 769 {
 770         int count;
 771         int count_pull;
 772         int count_put;
 773         int dflag;
 774         struct sk_buff *skb;
 775         u_char *cp;
 776
 777         if (!dev->drv[di])
 778                 return 0;
 779         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
 780                 if (sleep)
 781                         interruptible_sleep_on(sleep);
 782                 else
 783                         return 0;
 784         }
 785         if (len > dev->drv[di]->rcvcount[channel])
 786                 len = dev->drv[di]->rcvcount[channel];
 787         cp = buf;
 788         count = 0;
 789         while (len) {
 790                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 791                         break;
 792 #ifdef CONFIG_ISDN_AUDIO
 793                 if (ISDN_AUDIO_SKB_LOCK(skb))
 794                         break;
 795                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 796                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 797                         char *p = skb->data;
 798                         unsigned long DLEmask = (1 << channel);
 799
 800                         dflag = 0;
 801                         count_pull = count_put = 0;
 802                         while ((count_pull < skb->len) && (len > 0)) {
 803                                 len--;
 804                                 if (dev->drv[di]->DLEflag & DLEmask) {
 805                                         *cp++ = DLE;
 806                                         dev->drv[di]->DLEflag &= ~DLEmask;
 807                                 } else {
 808                                         *cp++ = *p;
 809                                         if (*p == DLE) {
 810                                                 dev->drv[di]->DLEflag |= DLEmask;
 811                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 812                                         }
 813                                         p++;
 814                                         count_pull++;
 815                                 }
 816                                 count_put++;
 817                         }
 818                         if (count_pull >= skb->len)
 819                                 dflag = 1;
 820                 } else {
 821 #endif
 822                         /* No DLE's in buff, so simply copy it */
 823                         dflag = 1;
 824                         if ((count_pull = skb->len) > len) {
 825                                 count_pull = len;
 826                                 dflag = 0;
 827                         }
 828                         count_put = count_pull;
 829                         skb_copy_from_linear_data(skb, cp, count_put);
 830                         cp += count_put;
 831                         len -= count_put;
 832 #ifdef CONFIG_ISDN_AUDIO
 833                 }
 834 #endif
 835                 count += count_put;
 836                 if (fp) {
 837                         memset(fp, 0, count_put);
 838                         fp += count_put;
 839                 }
 840                 if (dflag) {
 841                         /* We got all the data in this buff.
 842                          * Now we can dequeue it.
 843                          */
 844                         if (fp)
 845                                 *(fp - 1) = 0xff;
 846 #ifdef CONFIG_ISDN_AUDIO
 847                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 848 #endif
 849                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 850                         dev_kfree_skb(skb);
 851                 } else {
 852                         /* Not yet emptied this buff, so it
 853                          * must stay in the queue, for further calls
 854                          * but we pull off the data we got until now.
 855                          */
 856                         skb_pull(skb, count_pull);
 857 #ifdef CONFIG_ISDN_AUDIO
 858                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 859 #endif
 860                 }
 861                 dev->drv[di]->rcvcount[channel] -= count_put;
 862         }
 863         return count;
 864 }
 865
 866 /*
 867  * isdn_readbchan_tty() tries to get data from the read-queue.
 868  * It MUST be called with interrupts off.
 869  *
 870  * Be aware that this is not an atomic operation when sleep != 0, even though
 871  * interrupts are turned off! Well, like that we are currently only called
 872  * on behalf of a read system call on raw device files (which are documented
 873  * to be dangerous and for debugging purpose only). The inode semaphore
 874  * takes care that this is not called for the same minor device number while
 875  * we are sleeping, but access is not serialized against simultaneous read()
 876  * from the corresponding ttyI device. Can other ugly events, like changes
 877  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 878  */
 879 int
 880 isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
 881 {
 882         int count;
 883         int count_pull;
 884         int count_put;
 885         int dflag;
 886         struct sk_buff *skb;
 887         char last = 0;
 888         int len;
 889
 890         if (!dev->drv[di])
 891                 return 0;
 892         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 893                 return 0;
 894
 895         len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
 896         if (len == 0)
 897                 return len;
 898
 899         count = 0;
 900         while (len) {
 901                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 902                         break;
 903 #ifdef CONFIG_ISDN_AUDIO
 904                 if (ISDN_AUDIO_SKB_LOCK(skb))
 905                         break;
 906                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 907                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 908                         char *p = skb->data;
 909                         unsigned long DLEmask = (1 << channel);
 910
 911                         dflag = 0;
 912                         count_pull = count_put = 0;
 913                         while ((count_pull < skb->len) && (len > 0)) {
 914                                 /* push every character but the last to the tty buffer directly */
 915                                 if (count_put)
 916                                         tty_insert_flip_char(tty, last, TTY_NORMAL);
 917                                 len--;
 918                                 if (dev->drv[di]->DLEflag & DLEmask) {
 919                                         last = DLE;
 920                                         dev->drv[di]->DLEflag &= ~DLEmask;
 921                                 } else {
 922                                         last = *p;
 923                                         if (last == DLE) {
 924                                                 dev->drv[di]->DLEflag |= DLEmask;
 925                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 926                                         }
 927                                         p++;
 928                                         count_pull++;
 929                                 }
 930                                 count_put++;
 931                         }
 932                         if (count_pull >= skb->len)
 933                                 dflag = 1;
 934                 } else {
 935 #endif
 936                         /* No DLE's in buff, so simply copy it */
 937                         dflag = 1;
 938                         if ((count_pull = skb->len) > len) {
 939                                 count_pull = len;
 940                                 dflag = 0;
 941                         }
 942                         count_put = count_pull;
 943                         if (count_put > 1)
 944                                 tty_insert_flip_string(tty, skb->data, count_put - 1);
 945                         last = skb->data[count_put - 1];
 946                         len -= count_put;
 947 #ifdef CONFIG_ISDN_AUDIO
 948                 }
 949 #endif
 950                 count += count_put;
 951                 if (dflag) {
 952                         /* We got all the data in this buff.
 953                          * Now we can dequeue it.
 954                          */
 955                         if (cisco_hack)
 956                                 tty_insert_flip_char(tty, last, 0xFF);
 957                         else
 958                                 tty_insert_flip_char(tty, last, TTY_NORMAL);
 959 #ifdef CONFIG_ISDN_AUDIO
 960                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 961 #endif
 962                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 963                         dev_kfree_skb(skb);
 964                 } else {
 965                         tty_insert_flip_char(tty, last, TTY_NORMAL);
 966                         /* Not yet emptied this buff, so it
 967                          * must stay in the queue, for further calls
 968                          * but we pull off the data we got until now.
 969                          */
 970                         skb_pull(skb, count_pull);
 971 #ifdef CONFIG_ISDN_AUDIO
 972                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 973 #endif
 974                 }
 975                 dev->drv[di]->rcvcount[channel] -= count_put;
 976         }
 977         return count;
 978 }
 979
 980
 981 static inline int
 982 isdn_minor2drv(int minor)
 983 {
 984         return (dev->drvmap[minor]);
 985 }
 986
 987 static inline int
 988 isdn_minor2chan(int minor)
 989 {
 990         return (dev->chanmap[minor]);
 991 }
 992
 993 static char *
 994 isdn_statstr(void)
 995 {
 996         static char istatbuf[2048];
 997         char *p;
 998         int i;
 999
1000         sprintf(istatbuf, "idmap:\t");
1001         p = istatbuf + strlen(istatbuf);
1002         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1003                 sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
1004                 p = istatbuf + strlen(istatbuf);
1005         }
1006         sprintf(p, "\nchmap:\t");
1007         p = istatbuf + strlen(istatbuf);
1008         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1009                 sprintf(p, "%d ", dev->chanmap[i]);
1010                 p = istatbuf + strlen(istatbuf);
1011         }
1012         sprintf(p, "\ndrmap:\t");
1013         p = istatbuf + strlen(istatbuf);
1014         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1015                 sprintf(p, "%d ", dev->drvmap[i]);
1016                 p = istatbuf + strlen(istatbuf);
1017         }
1018         sprintf(p, "\nusage:\t");
1019         p = istatbuf + strlen(istatbuf);
1020         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1021                 sprintf(p, "%d ", dev->usage[i]);
1022                 p = istatbuf + strlen(istatbuf);
1023         }
1024         sprintf(p, "\nflags:\t");
1025         p = istatbuf + strlen(istatbuf);
1026         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
1027                 if (dev->drv[i]) {
1028                         sprintf(p, "%ld ", dev->drv[i]->online);
1029                         p = istatbuf + strlen(istatbuf);
1030                 } else {
1031                         sprintf(p, "? ");
1032                         p = istatbuf + strlen(istatbuf);
1033                 }
1034         }
1035         sprintf(p, "\nphone:\t");
1036         p = istatbuf + strlen(istatbuf);
1037         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1038                 sprintf(p, "%s ", dev->num[i]);
1039                 p = istatbuf + strlen(istatbuf);
1040         }
1041         sprintf(p, "\n");
1042         return istatbuf;
1043 }
1044
1045 /* Module interface-code */
1046
1047 void
1048 isdn_info_update(void)
1049 {
1050         infostruct *p = dev->infochain;
1051
1052         while (p) {
1053                 *(p->private) = 1;
1054                 p = (infostruct *) p->next;
1055         }
1056         wake_up_interruptible(&(dev->info_waitq));
1057 }
1058
1059 static ssize_t
1060 isdn_read(struct file *file, char __user *buf, size_t count, loff_t *off)
1061 {
1062         uint minor = iminor(file->f_path.dentry->d_inode);
1063         int len = 0;
1064         int drvidx;
1065         int chidx;
1066         int retval;
1067         char *p;
1068
1069         mutex_lock(&isdn_mutex);
1070         if (minor == ISDN_MINOR_STATUS) {
1071                 if (!file->private_data) {
1072                         if (file->f_flags & O_NONBLOCK) {
1073                                 retval = -EAGAIN;
1074                                 goto out;
1075                         }
1076                         interruptible_sleep_on(&(dev->info_waitq));
1077                 }
1078                 p = isdn_statstr();
1079                 file->private_data = NULL;
1080                 if ((len = strlen(p)) <= count) {
1081                         if (copy_to_user(buf, p, len)) {
1082                                 retval = -EFAULT;
1083                                 goto out;
1084                         }
1085                         *off += len;
1086                         retval = len;
1087                         goto out;
1088                 }
1089                 retval = 0;
1090                 goto out;
1091         }
1092         if (!dev->drivers) {
1093                 retval = -ENODEV;
1094                 goto out;
1095         }
1096         if (minor <= ISDN_MINOR_BMAX) {
1097                 printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1098                 drvidx = isdn_minor2drv(minor);
1099                 if (drvidx < 0) {
1100                         retval = -ENODEV;
1101                         goto out;
1102                 }
1103                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1104                         retval = -ENODEV;
1105                         goto out;
1106                 }
1107                 chidx = isdn_minor2chan(minor);
1108                 if (!(p = kmalloc(count, GFP_KERNEL))) {
1109                         retval = -ENOMEM;
1110                         goto out;
1111                 }
1112                 len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1113                                      &dev->drv[drvidx]->rcv_waitq[chidx]);
1114                 *off += len;
1115                 if (copy_to_user(buf, p, len))
1116                         len = -EFAULT;
1117                 kfree(p);
1118                 retval = len;
1119                 goto out;
1120         }
1121         if (minor <= ISDN_MINOR_CTRLMAX) {
1122                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1123                 if (drvidx < 0) {
1124                         retval = -ENODEV;
1125                         goto out;
1126                 }
1127                 if (!dev->drv[drvidx]->stavail) {
1128                         if (file->f_flags & O_NONBLOCK) {
1129                                 retval = -EAGAIN;
1130                                 goto out;
1131                         }
1132                         interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
1133                 }
1134                 if (dev->drv[drvidx]->interface->readstat) {
1135                         if (count > dev->drv[drvidx]->stavail)
1136                                 count = dev->drv[drvidx]->stavail;
1137                         len = dev->drv[drvidx]->interface->readstat(buf, count,
1138                                                                     drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1139                         if (len < 0) {
1140                                 retval = len;
1141                                 goto out;
1142                         }
1143                 } else {
1144                         len = 0;
1145                 }
1146                 if (len)
1147                         dev->drv[drvidx]->stavail -= len;
1148                 else
1149                         dev->drv[drvidx]->stavail = 0;
1150                 *off += len;
1151                 retval = len;
1152                 goto out;
1153         }
1154 #ifdef CONFIG_ISDN_PPP
1155         if (minor <= ISDN_MINOR_PPPMAX) {
1156                 retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1157                 goto out;
1158         }
1159 #endif
1160         retval = -ENODEV;
1161 out:
1162         mutex_unlock(&isdn_mutex);
1163         return retval;
1164 }
1165
1166 static ssize_t
1167 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
1168 {
1169         uint minor = iminor(file->f_path.dentry->d_inode);
1170         int drvidx;
1171         int chidx;
1172         int retval;
1173
1174         if (minor == ISDN_MINOR_STATUS)
1175                 return -EPERM;
1176         if (!dev->drivers)
1177                 return -ENODEV;
1178
1179         mutex_lock(&isdn_mutex);
1180         if (minor <= ISDN_MINOR_BMAX) {
1181                 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1182                 drvidx = isdn_minor2drv(minor);
1183                 if (drvidx < 0) {
1184                         retval = -ENODEV;
1185                         goto out;
1186                 }
1187                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1188                         retval = -ENODEV;
1189                         goto out;
1190                 }
1191                 chidx = isdn_minor2chan(minor);
1192                 while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
1193                         interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
1194                 goto out;
1195         }
1196         if (minor <= ISDN_MINOR_CTRLMAX) {
1197                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1198                 if (drvidx < 0) {
1199                         retval = -ENODEV;
1200                         goto out;
1201                 }
1202                 /*
1203                  * We want to use the isdnctrl device to load the firmware
1204                  *
1205                  if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1206                  return -ENODEV;
1207                 */
1208                 if (dev->drv[drvidx]->interface->writecmd)
1209                         retval = dev->drv[drvidx]->interface->
1210                                 writecmd(buf, count, drvidx,
1211                                          isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1212                 else
1213                         retval = count;
1214                 goto out;
1215         }
1216 #ifdef CONFIG_ISDN_PPP
1217         if (minor <= ISDN_MINOR_PPPMAX) {
1218                 retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1219                 goto out;
1220         }
1221 #endif
1222         retval = -ENODEV;
1223 out:
1224         mutex_unlock(&isdn_mutex);
1225         return retval;
1226 }
1227
1228 static unsigned int
1229 isdn_poll(struct file *file, poll_table *wait)
1230 {
1231         unsigned int mask = 0;
1232         unsigned int minor = iminor(file->f_path.dentry->d_inode);
1233         int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1234
1235         mutex_lock(&isdn_mutex);
1236         if (minor == ISDN_MINOR_STATUS) {
1237                 poll_wait(file, &(dev->info_waitq), wait);
1238                 /* mask = POLLOUT | POLLWRNORM; */
1239                 if (file->private_data) {
1240                         mask |= POLLIN | POLLRDNORM;
1241                 }
1242                 goto out;
1243         }
1244         if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1245                 if (drvidx < 0) {
1246                         /* driver deregistered while file open */
1247                         mask = POLLHUP;
1248                         goto out;
1249                 }
1250                 poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1251                 mask = POLLOUT | POLLWRNORM;
1252                 if (dev->drv[drvidx]->stavail) {
1253                         mask |= POLLIN | POLLRDNORM;
1254                 }
1255                 goto out;
1256         }
1257 #ifdef CONFIG_ISDN_PPP
1258         if (minor <= ISDN_MINOR_PPPMAX) {
1259                 mask = isdn_ppp_poll(file, wait);
1260                 goto out;
1261         }
1262 #endif
1263         mask = POLLERR;
1264 out:
1265         mutex_unlock(&isdn_mutex);
1266         return mask;
1267 }
1268
1269
1270 static int
1271 isdn_ioctl(struct file *file, uint cmd, ulong arg)
1272 {
1273         uint minor = iminor(file->f_path.dentry->d_inode);
1274         isdn_ctrl c;
1275         int drvidx;
1276         int ret;
1277         int i;
1278         char __user *p;
1279         char *s;
1280         union iocpar {
1281                 char name[10];
1282                 char bname[22];
1283                 isdn_ioctl_struct iocts;
1284                 isdn_net_ioctl_phone phone;
1285                 isdn_net_ioctl_cfg cfg;
1286         } iocpar;
1287         void __user *argp = (void __user *)arg;
1288
1289 #define name  iocpar.name
1290 #define bname iocpar.bname
1291 #define iocts iocpar.iocts
1292 #define phone iocpar.phone
1293 #define cfg   iocpar.cfg
1294
1295         if (minor == ISDN_MINOR_STATUS) {
1296                 switch (cmd) {
1297                 case IIOCGETDVR:
1298                         return (TTY_DV +
1299                                 (NET_DV << 8) +
1300                                 (INF_DV << 16));
1301                 case IIOCGETCPS:
1302                         if (arg) {
1303                                 ulong __user *p = argp;
1304                                 int i;
1305                                 if (!access_ok(VERIFY_WRITE, p,
1306                                                sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
1307                                         return -EFAULT;
1308                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1309                                         put_user(dev->ibytes[i], p++);
1310                                         put_user(dev->obytes[i], p++);
1311                                 }
1312                                 return 0;
1313                         } else
1314                                 return -EINVAL;
1315                         break;
1316 #ifdef CONFIG_NETDEVICES
1317                 case IIOCNETGPN:
1318                         /* Get peer phone number of a connected
1319                          * isdn network interface */
1320                         if (arg) {
1321                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1322                                         return -EFAULT;
1323                                 return isdn_net_getpeer(&phone, argp);
1324                         } else
1325                                 return -EINVAL;
1326 #endif
1327                 default:
1328                         return -EINVAL;
1329                 }
1330         }
1331         if (!dev->drivers)
1332                 return -ENODEV;
1333         if (minor <= ISDN_MINOR_BMAX) {
1334                 drvidx = isdn_minor2drv(minor);
1335                 if (drvidx < 0)
1336                         return -ENODEV;
1337                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1338                         return -ENODEV;
1339                 return 0;
1340         }
1341         if (minor <= ISDN_MINOR_CTRLMAX) {
1342 /*
1343  * isdn net devices manage lots of configuration variables as linked lists.
1344  * Those lists must only be manipulated from user space. Some of the ioctl's
1345  * service routines access user space and are not atomic. Therefore, ioctl's
1346  * manipulating the lists and ioctl's sleeping while accessing the lists
1347  * are serialized by means of a semaphore.
1348  */
1349                 switch (cmd) {
1350                 case IIOCNETDWRSET:
1351                         printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1352                         return (-EINVAL);
1353                 case IIOCNETLCR:
1354                         printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1355                         return -ENODEV;
1356 #ifdef CONFIG_NETDEVICES
1357                 case IIOCNETAIF:
1358                         /* Add a network-interface */
1359                         if (arg) {
1360                                 if (copy_from_user(name, argp, sizeof(name)))
1361                                         return -EFAULT;
1362                                 s = name;
1363                         } else {
1364                                 s = NULL;
1365                         }
1366                         ret = mutex_lock_interruptible(&dev->mtx);
1367                         if (ret) return ret;
1368                         if ((s = isdn_net_new(s, NULL))) {
1369                                 if (copy_to_user(argp, s, strlen(s) + 1)) {
1370                                         ret = -EFAULT;
1371                                 } else {
1372                                         ret = 0;
1373                                 }
1374                         } else
1375                                 ret = -ENODEV;
1376                         mutex_unlock(&dev->mtx);
1377                         return ret;
1378                 case IIOCNETASL:
1379                         /* Add a slave to a network-interface */
1380                         if (arg) {
1381                                 if (copy_from_user(bname, argp, sizeof(bname) - 1))
1382                                         return -EFAULT;
1383                         } else
1384                                 return -EINVAL;
1385                         ret = mutex_lock_interruptible(&dev->mtx);
1386                         if (ret) return ret;
1387                         if ((s = isdn_net_newslave(bname))) {
1388                                 if (copy_to_user(argp, s, strlen(s) + 1)) {
1389                                         ret = -EFAULT;
1390                                 } else {
1391                                         ret = 0;
1392                                 }
1393                         } else
1394                                 ret = -ENODEV;
1395                         mutex_unlock(&dev->mtx);
1396                         return ret;
1397                 case IIOCNETDIF:
1398                         /* Delete a network-interface */
1399                         if (arg) {
1400                                 if (copy_from_user(name, argp, sizeof(name)))
1401                                         return -EFAULT;
1402                                 ret = mutex_lock_interruptible(&dev->mtx);
1403                                 if (ret) return ret;
1404                                 ret = isdn_net_rm(name);
1405                                 mutex_unlock(&dev->mtx);
1406                                 return ret;
1407                         } else
1408                                 return -EINVAL;
1409                 case IIOCNETSCF:
1410                         /* Set configurable parameters of a network-interface */
1411                         if (arg) {
1412                                 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1413                                         return -EFAULT;
1414                                 return isdn_net_setcfg(&cfg);
1415                         } else
1416                                 return -EINVAL;
1417                 case IIOCNETGCF:
1418                         /* Get configurable parameters of a network-interface */
1419                         if (arg) {
1420                                 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1421                                         return -EFAULT;
1422                                 if (!(ret = isdn_net_getcfg(&cfg))) {
1423                                         if (copy_to_user(argp, &cfg, sizeof(cfg)))
1424                                                 return -EFAULT;
1425                                 }
1426                                 return ret;
1427                         } else
1428                                 return -EINVAL;
1429                 case IIOCNETANM:
1430                         /* Add a phone-number to a network-interface */
1431                         if (arg) {
1432                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1433                                         return -EFAULT;
1434                                 ret = mutex_lock_interruptible(&dev->mtx);
1435                                 if (ret) return ret;
1436                                 ret = isdn_net_addphone(&phone);
1437                                 mutex_unlock(&dev->mtx);
1438                                 return ret;
1439                         } else
1440                                 return -EINVAL;
1441                 case IIOCNETGNM:
1442                         /* Get list of phone-numbers of a network-interface */
1443                         if (arg) {
1444                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1445                                         return -EFAULT;
1446                                 ret = mutex_lock_interruptible(&dev->mtx);
1447                                 if (ret) return ret;
1448                                 ret = isdn_net_getphones(&phone, argp);
1449                                 mutex_unlock(&dev->mtx);
1450                                 return ret;
1451                         } else
1452                                 return -EINVAL;
1453                 case IIOCNETDNM:
1454                         /* Delete a phone-number of a network-interface */
1455                         if (arg) {
1456                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1457                                         return -EFAULT;
1458                                 ret = mutex_lock_interruptible(&dev->mtx);
1459                                 if (ret) return ret;
1460                                 ret = isdn_net_delphone(&phone);
1461                                 mutex_unlock(&dev->mtx);
1462                                 return ret;
1463                         } else
1464                                 return -EINVAL;
1465                 case IIOCNETDIL:
1466                         /* Force dialing of a network-interface */
1467                         if (arg) {
1468                                 if (copy_from_user(name, argp, sizeof(name)))
1469                                         return -EFAULT;
1470                                 return isdn_net_force_dial(name);
1471                         } else
1472                                 return -EINVAL;
1473 #ifdef CONFIG_ISDN_PPP
1474                 case IIOCNETALN:
1475                         if (!arg)
1476                                 return -EINVAL;
1477                         if (copy_from_user(name, argp, sizeof(name)))
1478                                 return -EFAULT;
1479                         return isdn_ppp_dial_slave(name);
1480                 case IIOCNETDLN:
1481                         if (!arg)
1482                                 return -EINVAL;
1483                         if (copy_from_user(name, argp, sizeof(name)))
1484                                 return -EFAULT;
1485                         return isdn_ppp_hangup_slave(name);
1486 #endif
1487                 case IIOCNETHUP:
1488                         /* Force hangup of a network-interface */
1489                         if (!arg)
1490                                 return -EINVAL;
1491                         if (copy_from_user(name, argp, sizeof(name)))
1492                                 return -EFAULT;
1493                         return isdn_net_force_hangup(name);
1494                         break;
1495 #endif                          /* CONFIG_NETDEVICES */
1496                 case IIOCSETVER:
1497                         dev->net_verbose = arg;
1498                         printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1499                         return 0;
1500                 case IIOCSETGST:
1501                         if (arg)
1502                                 dev->global_flags |= ISDN_GLOBAL_STOPPED;
1503                         else
1504                                 dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1505                         printk(KERN_INFO "isdn: Global Mode %s\n",
1506                                (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1507                         return 0;
1508                 case IIOCSETBRJ:
1509                         drvidx = -1;
1510                         if (arg) {
1511                                 int i;
1512                                 char *p;
1513                                 if (copy_from_user(&iocts, argp,
1514                                                    sizeof(isdn_ioctl_struct)))
1515                                         return -EFAULT;
1516                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1517                                 if (strlen(iocts.drvid)) {
1518                                         if ((p = strchr(iocts.drvid, ',')))
1519                                                 *p = 0;
1520                                         drvidx = -1;
1521                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1522                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1523                                                         drvidx = i;
1524                                                         break;
1525                                                 }
1526                                 }
1527                         }
1528                         if (drvidx == -1)
1529                                 return -ENODEV;
1530                         if (iocts.arg)
1531                                 dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1532                         else
1533                                 dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1534                         return 0;
1535                 case IIOCSIGPRF:
1536                         dev->profd = current;
1537                         return 0;
1538                         break;
1539                 case IIOCGETPRF:
1540                         /* Get all Modem-Profiles */
1541                         if (arg) {
1542                                 char __user *p = argp;
1543                                 int i;
1544
1545                                 if (!access_ok(VERIFY_WRITE, argp,
1546                                                (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1547                                                * ISDN_MAX_CHANNELS))
1548                                         return -EFAULT;
1549
1550                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1551                                         if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1552                                                          ISDN_MODEM_NUMREG))
1553                                                 return -EFAULT;
1554                                         p += ISDN_MODEM_NUMREG;
1555                                         if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1556                                                 return -EFAULT;
1557                                         p += ISDN_MSNLEN;
1558                                         if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1559                                                 return -EFAULT;
1560                                         p += ISDN_LMSNLEN;
1561                                 }
1562                                 return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1563                         } else
1564                                 return -EINVAL;
1565                         break;
1566                 case IIOCSETPRF:
1567                         /* Set all Modem-Profiles */
1568                         if (arg) {
1569                                 char __user *p = argp;
1570                                 int i;
1571
1572                                 if (!access_ok(VERIFY_READ, argp,
1573                                                (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1574                                                * ISDN_MAX_CHANNELS))
1575                                         return -EFAULT;
1576
1577                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1578                                         if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1579                                                            ISDN_MODEM_NUMREG))
1580                                                 return -EFAULT;
1581                                         p += ISDN_MODEM_NUMREG;
1582                                         if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1583                                                 return -EFAULT;
1584                                         p += ISDN_LMSNLEN;
1585                                         if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1586                                                 return -EFAULT;
1587                                         p += ISDN_MSNLEN;
1588                                 }
1589                                 return 0;
1590                         } else
1591                                 return -EINVAL;
1592                         break;
1593                 case IIOCSETMAP:
1594                 case IIOCGETMAP:
1595                         /* Set/Get MSN->EAZ-Mapping for a driver */
1596                         if (arg) {
1597
1598                                 if (copy_from_user(&iocts, argp,
1599                                                    sizeof(isdn_ioctl_struct)))
1600                                         return -EFAULT;
1601                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1602                                 if (strlen(iocts.drvid)) {
1603                                         drvidx = -1;
1604                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1605                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1606                                                         drvidx = i;
1607                                                         break;
1608                                                 }
1609                                 } else
1610                                         drvidx = 0;
1611                                 if (drvidx == -1)
1612                                         return -ENODEV;
1613                                 if (cmd == IIOCSETMAP) {
1614                                         int loop = 1;
1615
1616                                         p = (char __user *) iocts.arg;
1617                                         i = 0;
1618                                         while (loop) {
1619                                                 int j = 0;
1620
1621                                                 while (1) {
1622                                                         if (!access_ok(VERIFY_READ, p, 1))
1623                                                                 return -EFAULT;
1624                                                         get_user(bname[j], p++);
1625                                                         switch (bname[j]) {
1626                                                         case '\0':
1627                                                                 loop = 0;
1628                                                                 /* Fall through */
1629                                                         case ',':
1630                                                                 bname[j] = '\0';
1631                                                                 strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1632                                                                 j = ISDN_MSNLEN;
1633                                                                 break;
1634                                                         default:
1635                                                                 j++;
1636                                                         }
1637                                                         if (j >= ISDN_MSNLEN)
1638                                                                 break;
1639                                                 }
1640                                                 if (++i > 9)
1641                                                         break;
1642                                         }
1643                                 } else {
1644                                         p = (char __user *) iocts.arg;
1645                                         for (i = 0; i < 10; i++) {
1646                                                 snprintf(bname, sizeof(bname), "%s%s",
1647                                                          strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1648                                                          dev->drv[drvidx]->msn2eaz[i] : "_",
1649                                                          (i < 9) ? "," : "\0");
1650                                                 if (copy_to_user(p, bname, strlen(bname) + 1))
1651                                                         return -EFAULT;
1652                                                 p += strlen(bname);
1653                                         }
1654                                 }
1655                                 return 0;
1656                         } else
1657                                 return -EINVAL;
1658                 case IIOCDBGVAR:
1659                         if (arg) {
1660                                 if (copy_to_user(argp, &dev, sizeof(ulong)))
1661                                         return -EFAULT;
1662                                 return 0;
1663                         } else
1664                                 return -EINVAL;
1665                         break;
1666                 default:
1667                         if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1668                                 cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1669                         else
1670                                 return -EINVAL;
1671                         if (arg) {
1672                                 int i;
1673                                 char *p;
1674                                 if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1675                                         return -EFAULT;
1676                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1677                                 if (strlen(iocts.drvid)) {
1678                                         if ((p = strchr(iocts.drvid, ',')))
1679                                                 *p = 0;
1680                                         drvidx = -1;
1681                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1682                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1683                                                         drvidx = i;
1684                                                         break;
1685                                                 }
1686                                 } else
1687                                         drvidx = 0;
1688                                 if (drvidx == -1)
1689                                         return -ENODEV;
1690                                 if (!access_ok(VERIFY_WRITE, argp,
1691                                                sizeof(isdn_ioctl_struct)))
1692                                         return -EFAULT;
1693                                 c.driver = drvidx;
1694                                 c.command = ISDN_CMD_IOCTL;
1695                                 c.arg = cmd;
1696                                 memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1697                                 ret = isdn_command(&c);
1698                                 memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1699                                 if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1700                                         return -EFAULT;
1701                                 return ret;
1702                         } else
1703                                 return -EINVAL;
1704                 }
1705         }
1706 #ifdef CONFIG_ISDN_PPP
1707         if (minor <= ISDN_MINOR_PPPMAX)
1708                 return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1709 #endif
1710         return -ENODEV;
1711
1712 #undef name
1713 #undef bname
1714 #undef iocts
1715 #undef phone
1716 #undef cfg
1717 }
1718
1719 static long
1720 isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1721 {
1722         int ret;
1723
1724         mutex_lock(&isdn_mutex);
1725         ret = isdn_ioctl(file, cmd, arg);
1726         mutex_unlock(&isdn_mutex);
1727
1728         return ret;
1729 }
1730
1731 /*
1732  * Open the device code.
1733  */
1734 static int
1735 isdn_open(struct inode *ino, struct file *filep)
1736 {
1737         uint minor = iminor(ino);
1738         int drvidx;
1739         int chidx;
1740         int retval = -ENODEV;
1741
1742         mutex_lock(&isdn_mutex);
1743         if (minor == ISDN_MINOR_STATUS) {
1744                 infostruct *p;
1745
1746                 if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1747                         p->next = (char *) dev->infochain;
1748                         p->private = (char *) &(filep->private_data);
1749                         dev->infochain = p;
1750                         /* At opening we allow a single update */
1751                         filep->private_data = (char *) 1;
1752                         retval = 0;
1753                         goto out;
1754                 } else {
1755                         retval = -ENOMEM;
1756                         goto out;
1757                 }
1758         }
1759         if (!dev->channels)
1760                 goto out;
1761         if (minor <= ISDN_MINOR_BMAX) {
1762                 printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1763                 drvidx = isdn_minor2drv(minor);
1764                 if (drvidx < 0)
1765                         goto out;
1766                 chidx = isdn_minor2chan(minor);
1767                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1768                         goto out;
1769                 if (!(dev->drv[drvidx]->online & (1 << chidx)))
1770                         goto out;
1771                 isdn_lock_drivers();
1772                 retval = 0;
1773                 goto out;
1774         }
1775         if (minor <= ISDN_MINOR_CTRLMAX) {
1776                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1777                 if (drvidx < 0)
1778                         goto out;
1779                 isdn_lock_drivers();
1780                 retval = 0;
1781                 goto out;
1782         }
1783 #ifdef CONFIG_ISDN_PPP
1784         if (minor <= ISDN_MINOR_PPPMAX) {
1785                 retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1786                 if (retval == 0)
1787                         isdn_lock_drivers();
1788                 goto out;
1789         }
1790 #endif
1791 out:
1792         nonseekable_open(ino, filep);
1793         mutex_unlock(&isdn_mutex);
1794         return retval;
1795 }
1796
1797 static int
1798 isdn_close(struct inode *ino, struct file *filep)
1799 {
1800         uint minor = iminor(ino);
1801
1802         mutex_lock(&isdn_mutex);
1803         if (minor == ISDN_MINOR_STATUS) {
1804                 infostruct *p = dev->infochain;
1805                 infostruct *q = NULL;
1806
1807                 while (p) {
1808                         if (p->private == (char *) &(filep->private_data)) {
1809                                 if (q)
1810                                         q->next = p->next;
1811                                 else
1812                                         dev->infochain = (infostruct *) (p->next);
1813                                 kfree(p);
1814                                 goto out;
1815                         }
1816                         q = p;
1817                         p = (infostruct *) (p->next);
1818                 }
1819                 printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1820                 goto out;
1821         }
1822         isdn_unlock_drivers();
1823         if (minor <= ISDN_MINOR_BMAX)
1824                 goto out;
1825         if (minor <= ISDN_MINOR_CTRLMAX) {
1826                 if (dev->profd == current)
1827                         dev->profd = NULL;
1828                 goto out;
1829         }
1830 #ifdef CONFIG_ISDN_PPP
1831         if (minor <= ISDN_MINOR_PPPMAX)
1832                 isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1833 #endif
1834
1835 out:
1836         mutex_unlock(&isdn_mutex);
1837         return 0;
1838 }
1839
1840 static const struct file_operations isdn_fops =
1841 {
1842         .owner          = THIS_MODULE,
1843         .llseek         = no_llseek,
1844         .read           = isdn_read,
1845         .write          = isdn_write,
1846         .poll           = isdn_poll,
1847         .unlocked_ioctl = isdn_unlocked_ioctl,
1848         .open           = isdn_open,
1849         .release        = isdn_close,
1850 };
1851
1852 char *
1853 isdn_map_eaz2msn(char *msn, int di)
1854 {
1855         isdn_driver_t *this = dev->drv[di];
1856         int i;
1857
1858         if (strlen(msn) == 1) {
1859                 i = msn[0] - '0';
1860                 if ((i >= 0) && (i <= 9))
1861                         if (strlen(this->msn2eaz[i]))
1862                                 return (this->msn2eaz[i]);
1863         }
1864         return (msn);
1865 }
1866
1867 /*
1868  * Find an unused ISDN-channel, whose feature-flags match the
1869  * given L2- and L3-protocols.
1870  */
1871 #define L2V (~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038))
1872
1873 /*
1874  * This function must be called with holding the dev->lock.
1875  */
1876 int
1877 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1878                       , int pre_chan, char *msn)
1879 {
1880         int i;
1881         ulong features;
1882         ulong vfeatures;
1883
1884         features = ((1 << l2_proto) | (0x10000 << l3_proto));
1885         vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1886                      ~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038));
1887         /* If Layer-2 protocol is V.110, accept drivers with
1888          * transparent feature even if these don't support V.110
1889          * because we can emulate this in linklevel.
1890          */
1891         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1892                 if (USG_NONE(dev->usage[i]) &&
1893                     (dev->drvmap[i] != -1)) {
1894                         int d = dev->drvmap[i];
1895                         if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1896                             ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1897                                 continue;
1898                         if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1899                                 continue;
1900                         if (dev->usage[i] & ISDN_USAGE_DISABLED)
1901                                 continue; /* usage not allowed */
1902                         if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1903                                 if (((dev->drv[d]->interface->features & features) == features) ||
1904                                     (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1905                                      (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1906                                         if ((pre_dev < 0) || (pre_chan < 0)) {
1907                                                 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1908                                                 dev->usage[i] |= usage;
1909                                                 isdn_info_update();
1910                                                 return i;
1911                                         } else {
1912                                                 if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1913                                                         dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1914                                                         dev->usage[i] |= usage;
1915                                                         isdn_info_update();
1916                                                         return i;
1917                                                 }
1918                                         }
1919                                 }
1920                         }
1921                 }
1922         return -1;
1923 }
1924
1925 /*
1926  * Set state of ISDN-channel to 'unused'
1927  */
1928 void
1929 isdn_free_channel(int di, int ch, int usage)
1930 {
1931         int i;
1932
1933         if ((di < 0) || (ch < 0)) {
1934                 printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1935                        __func__, di, ch);
1936                 return;
1937         }
1938         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1939                 if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1940                     (dev->drvmap[i] == di) &&
1941                     (dev->chanmap[i] == ch)) {
1942                         dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1943                         strcpy(dev->num[i], "???");
1944                         dev->ibytes[i] = 0;
1945                         dev->obytes[i] = 0;
1946 // 20.10.99 JIM, try to reinitialize v110 !
1947                         dev->v110emu[i] = 0;
1948                         atomic_set(&(dev->v110use[i]), 0);
1949                         isdn_v110_close(dev->v110[i]);
1950                         dev->v110[i] = NULL;
1951 // 20.10.99 JIM, try to reinitialize v110 !
1952                         isdn_info_update();
1953                         if (dev->drv[di])
1954                                 skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1955                 }
1956 }
1957
1958 /*
1959  * Cancel Exclusive-Flag for ISDN-channel
1960  */
1961 void
1962 isdn_unexclusive_channel(int di, int ch)
1963 {
1964         int i;
1965
1966         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1967                 if ((dev->drvmap[i] == di) &&
1968                     (dev->chanmap[i] == ch)) {
1969                         dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1970                         isdn_info_update();
1971                         return;
1972                 }
1973 }
1974
1975 /*
1976  *  writebuf replacement for SKB_ABLE drivers
1977  */
1978 static int
1979 isdn_writebuf_stub(int drvidx, int chan, const u_char __user *buf, int len)
1980 {
1981         int ret;
1982         int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1983         struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1984
1985         if (!skb)
1986                 return -ENOMEM;
1987         skb_reserve(skb, hl);
1988         if (copy_from_user(skb_put(skb, len), buf, len)) {
1989                 dev_kfree_skb(skb);
1990                 return -EFAULT;
1991         }
1992         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1993         if (ret <= 0)
1994                 dev_kfree_skb(skb);
1995         if (ret > 0)
1996                 dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1997         return ret;
1998 }
1999
2000 /*
2001  * Return: length of data on success, -ERRcode on failure.
2002  */
2003 int
2004 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
2005 {
2006         int ret;
2007         struct sk_buff *nskb = NULL;
2008         int v110_ret = skb->len;
2009         int idx = isdn_dc2minor(drvidx, chan);
2010
2011         if (dev->v110[idx]) {
2012                 atomic_inc(&dev->v110use[idx]);
2013                 nskb = isdn_v110_encode(dev->v110[idx], skb);
2014                 atomic_dec(&dev->v110use[idx]);
2015                 if (!nskb)
2016                         return 0;
2017                 v110_ret = *((int *)nskb->data);
2018                 skb_pull(nskb, sizeof(int));
2019                 if (!nskb->len) {
2020                         dev_kfree_skb(nskb);
2021                         return v110_ret;
2022                 }
2023                 /* V.110 must always be acknowledged */
2024                 ack = 1;
2025                 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2026         } else {
2027                 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2028
2029                 if (skb_headroom(skb) < hl) {
2030                         /*
2031                          * This should only occur when new HL driver with
2032                          * increased hl_hdrlen was loaded after netdevice
2033                          * was created and connected to the new driver.
2034                          *
2035                          * The V.110 branch (re-allocates on its own) does
2036                          * not need this
2037                          */
2038                         struct sk_buff *skb_tmp;
2039
2040                         skb_tmp = skb_realloc_headroom(skb, hl);
2041                         printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2042                         if (!skb_tmp) return -ENOMEM; /* 0 better? */
2043                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2044                         if (ret > 0) {
2045                                 dev_kfree_skb(skb);
2046                         } else {
2047                                 dev_kfree_skb(skb_tmp);
2048                         }
2049                 } else {
2050                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2051                 }
2052         }
2053         if (ret > 0) {
2054                 dev->obytes[idx] += ret;
2055                 if (dev->v110[idx]) {
2056                         atomic_inc(&dev->v110use[idx]);
2057                         dev->v110[idx]->skbuser++;
2058                         atomic_dec(&dev->v110use[idx]);
2059                         /* For V.110 return unencoded data length */
2060                         ret = v110_ret;
2061                         /* if the complete frame was send we free the skb;
2062                            if not upper function will requeue the skb */
2063                         if (ret == skb->len)
2064                                 dev_kfree_skb(skb);
2065                 }
2066         } else
2067                 if (dev->v110[idx])
2068                         dev_kfree_skb(nskb);
2069         return ret;
2070 }
2071
2072 static int
2073 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2074 {
2075         int j, k, m;
2076
2077         init_waitqueue_head(&d->st_waitq);
2078         if (d->flags & DRV_FLAG_RUNNING)
2079                 return -1;
2080         if (n < 1) return 0;
2081
2082         m = (adding) ? d->channels + n : n;
2083
2084         if (dev->channels + n > ISDN_MAX_CHANNELS) {
2085                 printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2086                        ISDN_MAX_CHANNELS);
2087                 return -1;
2088         }
2089
2090         if ((adding) && (d->rcverr))
2091                 kfree(d->rcverr);
2092         if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2093                 printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2094                 return -1;
2095         }
2096
2097         if ((adding) && (d->rcvcount))
2098                 kfree(d->rcvcount);
2099         if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2100                 printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2101                 if (!adding)
2102                         kfree(d->rcverr);
2103                 return -1;
2104         }
2105
2106         if ((adding) && (d->rpqueue)) {
2107                 for (j = 0; j < d->channels; j++)
2108                         skb_queue_purge(&d->rpqueue[j]);
2109                 kfree(d->rpqueue);
2110         }
2111         if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
2112                 printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2113                 if (!adding) {
2114                         kfree(d->rcvcount);
2115                         kfree(d->rcverr);
2116                 }
2117                 return -1;
2118         }
2119         for (j = 0; j < m; j++) {
2120                 skb_queue_head_init(&d->rpqueue[j]);
2121         }
2122
2123         if ((adding) && (d->rcv_waitq))
2124                 kfree(d->rcv_waitq);
2125         d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
2126         if (!d->rcv_waitq) {
2127                 printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2128                 if (!adding) {
2129                         kfree(d->rpqueue);
2130                         kfree(d->rcvcount);
2131                         kfree(d->rcverr);
2132                 }
2133                 return -1;
2134         }
2135         d->snd_waitq = d->rcv_waitq + m;
2136         for (j = 0; j < m; j++) {
2137                 init_waitqueue_head(&d->rcv_waitq[j]);
2138                 init_waitqueue_head(&d->snd_waitq[j]);
2139         }
2140
2141         dev->channels += n;
2142         for (j = d->channels; j < m; j++)
2143                 for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2144                         if (dev->chanmap[k] < 0) {
2145                                 dev->chanmap[k] = j;
2146                                 dev->drvmap[k] = drvidx;
2147                                 break;
2148                         }
2149         d->channels = m;
2150         return 0;
2151 }
2152
2153 /*
2154  * Low-level-driver registration
2155  */
2156
2157 static void
2158 set_global_features(void)
2159 {
2160         int drvidx;
2161
2162         dev->global_features = 0;
2163         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2164                 if (!dev->drv[drvidx])
2165                         continue;
2166                 if (dev->drv[drvidx]->interface)
2167                         dev->global_features |= dev->drv[drvidx]->interface->features;
2168         }
2169 }
2170
2171 #ifdef CONFIG_ISDN_DIVERSION
2172
2173 static char *map_drvname(int di)
2174 {
2175         if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2176                 return (NULL);
2177         return (dev->drvid[di]); /* driver name */
2178 } /* map_drvname */
2179
2180 static int map_namedrv(char *id)
2181 {  int i;
2182
2183         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2184         { if (!strcmp(dev->drvid[i], id))
2185                         return (i);
2186         }
2187         return (-1);
2188 } /* map_namedrv */
2189
2190 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2191 {
2192         if (i_div->if_magic != DIVERT_IF_MAGIC)
2193                 return (DIVERT_VER_ERR);
2194         switch (i_div->cmd)
2195         {
2196         case DIVERT_CMD_REL:
2197                 if (divert_if != i_div)
2198                         return (DIVERT_REL_ERR);
2199                 divert_if = NULL; /* free interface */
2200                 return (DIVERT_NO_ERR);
2201
2202         case DIVERT_CMD_REG:
2203                 if (divert_if)
2204                         return (DIVERT_REG_ERR);
2205                 i_div->ll_cmd = isdn_command; /* set command function */
2206                 i_div->drv_to_name = map_drvname;
2207                 i_div->name_to_drv = map_namedrv;
2208                 divert_if = i_div; /* remember interface */
2209                 return (DIVERT_NO_ERR);
2210
2211         default:
2212                 return (DIVERT_CMD_ERR);
2213         }
2214 } /* DIVERT_REG_NAME */
2215
2216 EXPORT_SYMBOL(DIVERT_REG_NAME);
2217
2218 #endif /* CONFIG_ISDN_DIVERSION */
2219
2220
2221 EXPORT_SYMBOL(register_isdn);
2222 #ifdef CONFIG_ISDN_PPP
2223 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2224 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2225 #endif
2226
2227 int
2228 register_isdn(isdn_if *i)
2229 {
2230         isdn_driver_t *d;
2231         int j;
2232         ulong flags;
2233         int drvidx;
2234
2235         if (dev->drivers >= ISDN_MAX_DRIVERS) {
2236                 printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2237                        ISDN_MAX_DRIVERS);
2238                 return 0;
2239         }
2240         if (!i->writebuf_skb) {
2241                 printk(KERN_WARNING "register_isdn: No write routine given.\n");
2242                 return 0;
2243         }
2244         if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2245                 printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2246                 return 0;
2247         }
2248
2249         d->maxbufsize = i->maxbufsize;
2250         d->pktcount = 0;
2251         d->stavail = 0;
2252         d->flags = DRV_FLAG_LOADED;
2253         d->online = 0;
2254         d->interface = i;
2255         d->channels = 0;
2256         spin_lock_irqsave(&dev->lock, flags);
2257         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2258                 if (!dev->drv[drvidx])
2259                         break;
2260         if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2261                 spin_unlock_irqrestore(&dev->lock, flags);
2262                 kfree(d);
2263                 return 0;
2264         }
2265         i->channels = drvidx;
2266         i->rcvcallb_skb = isdn_receive_skb_callback;
2267         i->statcallb = isdn_status_callback;
2268         if (!strlen(i->id))
2269                 sprintf(i->id, "line%d", drvidx);
2270         for (j = 0; j < drvidx; j++)
2271                 if (!strcmp(i->id, dev->drvid[j]))
2272                         sprintf(i->id, "line%d", drvidx);
2273         dev->drv[drvidx] = d;
2274         strcpy(dev->drvid[drvidx], i->id);
2275         isdn_info_update();
2276         dev->drivers++;
2277         set_global_features();
2278         spin_unlock_irqrestore(&dev->lock, flags);
2279         return 1;
2280 }
2281
2282 /*
2283 *****************************************************************************
2284 * And now the modules code.
2285 *****************************************************************************
2286 */
2287
2288 static char *
2289 isdn_getrev(const char *revision)
2290 {
2291         char *rev;
2292         char *p;
2293
2294         if ((p = strchr(revision, ':'))) {
2295                 rev = p + 2;
2296                 p = strchr(rev, '$');
2297                 *--p = 0;
2298         } else
2299                 rev = "???";
2300         return rev;
2301 }
2302
2303 /*
2304  * Allocate and initialize all data, register modem-devices
2305  */
2306 static int __init isdn_init(void)
2307 {
2308         int i;
2309         char tmprev[50];
2310
2311         dev = vzalloc(sizeof(isdn_dev));
2312         if (!dev) {
2313                 printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2314                 return -EIO;
2315         }
2316         init_timer(&dev->timer);
2317         dev->timer.function = isdn_timer_funct;
2318         spin_lock_init(&dev->lock);
2319         spin_lock_init(&dev->timerlock);
2320 #ifdef MODULE
2321         dev->owner = THIS_MODULE;
2322 #endif
2323         mutex_init(&dev->mtx);
2324         init_waitqueue_head(&dev->info_waitq);
2325         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2326                 dev->drvmap[i] = -1;
2327                 dev->chanmap[i] = -1;
2328                 dev->m_idx[i] = -1;
2329                 strcpy(dev->num[i], "???");
2330                 init_waitqueue_head(&dev->mdm.info[i].open_wait);
2331                 init_waitqueue_head(&dev->mdm.info[i].close_wait);
2332         }
2333         if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2334                 printk(KERN_WARNING "isdn: Could not register control devices\n");
2335                 vfree(dev);
2336                 return -EIO;
2337         }
2338         if ((isdn_tty_modem_init()) < 0) {
2339                 printk(KERN_WARNING "isdn: Could not register tty devices\n");
2340                 vfree(dev);
2341                 unregister_chrdev(ISDN_MAJOR, "isdn");
2342                 return -EIO;
2343         }
2344 #ifdef CONFIG_ISDN_PPP
2345         if (isdn_ppp_init() < 0) {
2346                 printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2347                 isdn_tty_exit();
2348                 unregister_chrdev(ISDN_MAJOR, "isdn");
2349                 vfree(dev);
2350                 return -EIO;
2351         }
2352 #endif                          /* CONFIG_ISDN_PPP */
2353
2354         strcpy(tmprev, isdn_revision);
2355         printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2356         strcpy(tmprev, isdn_tty_revision);
2357         printk("%s/", isdn_getrev(tmprev));
2358         strcpy(tmprev, isdn_net_revision);
2359         printk("%s/", isdn_getrev(tmprev));
2360         strcpy(tmprev, isdn_ppp_revision);
2361         printk("%s/", isdn_getrev(tmprev));
2362         strcpy(tmprev, isdn_audio_revision);
2363         printk("%s/", isdn_getrev(tmprev));
2364         strcpy(tmprev, isdn_v110_revision);
2365         printk("%s", isdn_getrev(tmprev));
2366
2367 #ifdef MODULE
2368         printk(" loaded\n");
2369 #else
2370         printk("\n");
2371 #endif
2372         isdn_info_update();
2373         return 0;
2374 }
2375
2376 /*
2377  * Unload module
2378  */
2379 static void __exit isdn_exit(void)
2380 {
2381 #ifdef CONFIG_ISDN_PPP
2382         isdn_ppp_cleanup();
2383 #endif
2384         if (isdn_net_rmall() < 0) {
2385                 printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2386                 return;
2387         }
2388         isdn_tty_exit();
2389         unregister_chrdev(ISDN_MAJOR, "isdn");
2390         del_timer(&dev->timer);
2391         /* call vfree with interrupts enabled, else it will hang */
2392         vfree(dev);
2393         printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2394 }
2395
2396 module_init(isdn_init);
2397 module_exit(isdn_exit);