drivers/isdn/i4l/isdn_common.c

   1 /* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
   2  *
   3  * Linux ISDN subsystem, common used functions (linklevel).
   4  *
   5  * Copyright 1994-1999  by Fritz Elfert ([email protected])
   6  * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp ([email protected])
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/slab.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/isdn.h>
  20 #include <linux/mutex.h>
  21 #include "isdn_common.h"
  22 #include "isdn_tty.h"
  23 #include "isdn_net.h"
  24 #include "isdn_ppp.h"
  25 #ifdef CONFIG_ISDN_AUDIO
  26 #include "isdn_audio.h"
  27 #endif
  28 #ifdef CONFIG_ISDN_DIVERSION_MODULE
  29 #define CONFIG_ISDN_DIVERSION
  30 #endif
  31 #ifdef CONFIG_ISDN_DIVERSION
  32 #include <linux/isdn_divertif.h>
  33 #endif /* CONFIG_ISDN_DIVERSION */
  34 #include "isdn_v110.h"
  35
  36 /* Debugflags */
  37 #undef ISDN_DEBUG_STATCALLB
  38
  39 MODULE_DESCRIPTION("ISDN4Linux: link layer");
  40 MODULE_AUTHOR("Fritz Elfert");
  41 MODULE_LICENSE("GPL");
  42
  43 isdn_dev *dev;
  44
  45 static DEFINE_MUTEX(isdn_mutex);
  46 static char *isdn_revision = "$Revision: 1.1.2.3 $";
  47
  48 extern char *isdn_net_revision;
  49 #ifdef CONFIG_ISDN_PPP
  50 extern char *isdn_ppp_revision;
  51 #else
  52 static char *isdn_ppp_revision = ": none $";
  53 #endif
  54 #ifdef CONFIG_ISDN_AUDIO
  55 extern char *isdn_audio_revision;
  56 #else
  57 static char *isdn_audio_revision = ": none $";
  58 #endif
  59 extern char *isdn_v110_revision;
  60
  61 #ifdef CONFIG_ISDN_DIVERSION
  62 static isdn_divert_if *divert_if; /* = NULL */
  63 #endif /* CONFIG_ISDN_DIVERSION */
  64
  65
  66 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
  67 static void set_global_features(void);
  68 static int isdn_wildmat(char *s, char *p);
  69 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
  70
  71 static inline void
  72 isdn_lock_driver(isdn_driver_t *drv)
  73 {
  74         try_module_get(drv->interface->owner);
  75         drv->locks++;
  76 }
  77
  78 void
  79 isdn_lock_drivers(void)
  80 {
  81         int i;
  82
  83         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
  84                 if (!dev->drv[i])
  85                         continue;
  86                 isdn_lock_driver(dev->drv[i]);
  87         }
  88 }
  89
  90 static inline void
  91 isdn_unlock_driver(isdn_driver_t *drv)
  92 {
  93         if (drv->locks > 0) {
  94                 drv->locks--;
  95                 module_put(drv->interface->owner);
  96         }
  97 }
  98
  99 void
 100 isdn_unlock_drivers(void)
 101 {
 102         int i;
 103
 104         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
 105                 if (!dev->drv[i])
 106                         continue;
 107                 isdn_unlock_driver(dev->drv[i]);
 108         }
 109 }
 110
 111 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
 112 void
 113 isdn_dumppkt(char *s, u_char *p, int len, int dumplen)
 114 {
 115         int dumpc;
 116
 117         printk(KERN_DEBUG "%s(%d) ", s, len);
 118         for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
 119                 printk(" %02x", *p++);
 120         printk("\n");
 121 }
 122 #endif
 123
 124 /*
 125  * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 126  * It was originally written and put to PD by [email protected] (Rich Salz)
 127  */
 128 static int
 129 isdn_star(char *s, char *p)
 130 {
 131         while (isdn_wildmat(s, p)) {
 132                 if (*++s == '\0')
 133                         return (2);
 134         }
 135         return (0);
 136 }
 137
 138 /*
 139  * Shell-type Pattern-matching for incoming caller-Ids
 140  * This function gets a string in s and checks, if it matches the pattern
 141  * given in p.
 142  *
 143  * Return:
 144  *   0 = match.
 145  *   1 = no match.
 146  *   2 = no match. Would eventually match, if s would be longer.
 147  *
 148  * Possible Patterns:
 149  *
 150  * '?'     matches one character
 151  * '*'     matches zero or more characters
 152  * [xyz]   matches the set of characters in brackets.
 153  * [^xyz]  matches any single character not in the set of characters
 154  */
 155
 156 static int
 157 isdn_wildmat(char *s, char *p)
 158 {
 159         register int last;
 160         register int matched;
 161         register int reverse;
 162         register int nostar = 1;
 163
 164         if (!(*s) && !(*p))
 165                 return (1);
 166         for (; *p; s++, p++)
 167                 switch (*p) {
 168                 case '\\':
 169                         /*
 170                          * Literal match with following character,
 171                          * fall through.
 172                          */
 173                         p++;
 174                 default:
 175                         if (*s != *p)
 176                                 return (*s == '\0') ? 2 : 1;
 177                                         continue;
 178                 case '?':
 179                         /* Match anything. */
 180                         if (*s == '\0')
 181                                 return (2);
 182                         continue;
 183                 case '*':
 184                         nostar = 0;
 185                         /* Trailing star matches everything. */
 186                         return (*++p ? isdn_star(s, p) : 0);
 187                 case '[':
 188                         /* [^....] means inverse character class. */
 189                         if ((reverse = (p[1] == '^')))
 190                                 p++;
 191                         for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
 192                                 /* This next line requires a good C compiler. */
 193                                 if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
 194                                         matched = 1;
 195                         if (matched == reverse)
 196                                 return (1);
 197                         continue;
 198                 }
 199         return (*s == '\0') ? 0 : nostar;
 200 }
 201
 202 int isdn_msncmp(const char *msn1, const char *msn2)
 203 {
 204         char TmpMsn1[ISDN_MSNLEN];
 205         char TmpMsn2[ISDN_MSNLEN];
 206         char *p;
 207
 208         for (p = TmpMsn1; *msn1 && *msn1 != ':';)  // Strip off a SPID
 209                 *p++ = *msn1++;
 210         *p = '\0';
 211
 212         for (p = TmpMsn2; *msn2 && *msn2 != ':';)  // Strip off a SPID
 213                 *p++ = *msn2++;
 214         *p = '\0';
 215
 216         return isdn_wildmat(TmpMsn1, TmpMsn2);
 217 }
 218
 219 int
 220 isdn_dc2minor(int di, int ch)
 221 {
 222         int i;
 223         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 224                 if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
 225                         return i;
 226         return -1;
 227 }
 228
 229 static int isdn_timer_cnt1 = 0;
 230 static int isdn_timer_cnt2 = 0;
 231 static int isdn_timer_cnt3 = 0;
 232
 233 static void
 234 isdn_timer_funct(struct timer_list *unused)
 235 {
 236         int tf = dev->tflags;
 237         if (tf & ISDN_TIMER_FAST) {
 238                 if (tf & ISDN_TIMER_MODEMREAD)
 239                         isdn_tty_readmodem();
 240                 if (tf & ISDN_TIMER_MODEMPLUS)
 241                         isdn_tty_modem_escape();
 242                 if (tf & ISDN_TIMER_MODEMXMIT)
 243                         isdn_tty_modem_xmit();
 244         }
 245         if (tf & ISDN_TIMER_SLOW) {
 246                 if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
 247                         isdn_timer_cnt1 = 0;
 248                         if (tf & ISDN_TIMER_NETDIAL)
 249                                 isdn_net_dial();
 250                 }
 251                 if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
 252                         isdn_timer_cnt2 = 0;
 253                         if (tf & ISDN_TIMER_NETHANGUP)
 254                                 isdn_net_autohup();
 255                         if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
 256                                 isdn_timer_cnt3 = 0;
 257                                 if (tf & ISDN_TIMER_MODEMRING)
 258                                         isdn_tty_modem_ring();
 259                         }
 260                         if (tf & ISDN_TIMER_CARRIER)
 261                                 isdn_tty_carrier_timeout();
 262                 }
 263         }
 264         if (tf)
 265                 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
 266 }
 267
 268 void
 269 isdn_timer_ctrl(int tf, int onoff)
 270 {
 271         unsigned long flags;
 272         int old_tflags;
 273
 274         spin_lock_irqsave(&dev->timerlock, flags);
 275         if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
 276                 /* If the slow-timer wasn't activated until now */
 277                 isdn_timer_cnt1 = 0;
 278                 isdn_timer_cnt2 = 0;
 279         }
 280         old_tflags = dev->tflags;
 281         if (onoff)
 282                 dev->tflags |= tf;
 283         else
 284                 dev->tflags &= ~tf;
 285         if (dev->tflags && !old_tflags)
 286                 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
 287         spin_unlock_irqrestore(&dev->timerlock, flags);
 288 }
 289
 290 /*
 291  * Receive a packet from B-Channel. (Called from low-level-module)
 292  */
 293 static void
 294 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
 295 {
 296         int i;
 297
 298         if ((i = isdn_dc2minor(di, channel)) == -1) {
 299                 dev_kfree_skb(skb);
 300                 return;
 301         }
 302         /* Update statistics */
 303         dev->ibytes[i] += skb->len;
 304
 305         /* First, try to deliver data to network-device */
 306         if (isdn_net_rcv_skb(i, skb))
 307                 return;
 308
 309         /* V.110 handling
 310          * makes sense for async streams only, so it is
 311          * called after possible net-device delivery.
 312          */
 313         if (dev->v110[i]) {
 314                 atomic_inc(&dev->v110use[i]);
 315                 skb = isdn_v110_decode(dev->v110[i], skb);
 316                 atomic_dec(&dev->v110use[i]);
 317                 if (!skb)
 318                         return;
 319         }
 320
 321         /* No network-device found, deliver to tty or raw-channel */
 322         if (skb->len) {
 323                 if (isdn_tty_rcv_skb(i, di, channel, skb))
 324                         return;
 325                 wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
 326         } else
 327                 dev_kfree_skb(skb);
 328 }
 329
 330 /*
 331  * Intercept command from Linklevel to Lowlevel.
 332  * If layer 2 protocol is V.110 and this is not supported by current
 333  * lowlevel-driver, use driver's transparent mode and handle V.110 in
 334  * linklevel instead.
 335  */
 336 int
 337 isdn_command(isdn_ctrl *cmd)
 338 {
 339         if (cmd->driver == -1) {
 340                 printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
 341                 return (1);
 342         }
 343         if (!dev->drv[cmd->driver]) {
 344                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
 345                        cmd->command, cmd->driver);
 346                 return (1);
 347         }
 348         if (!dev->drv[cmd->driver]->interface) {
 349                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
 350                        cmd->command, cmd->driver);
 351                 return (1);
 352         }
 353         if (cmd->command == ISDN_CMD_SETL2) {
 354                 int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
 355                 unsigned long l2prot = (cmd->arg >> 8) & 255;
 356                 unsigned long features = (dev->drv[cmd->driver]->interface->features
 357                                           >> ISDN_FEATURE_L2_SHIFT) &
 358                         ISDN_FEATURE_L2_MASK;
 359                 unsigned long l2_feature = (1 << l2prot);
 360
 361                 switch (l2prot) {
 362                 case ISDN_PROTO_L2_V11096:
 363                 case ISDN_PROTO_L2_V11019:
 364                 case ISDN_PROTO_L2_V11038:
 365                         /* If V.110 requested, but not supported by
 366                          * HL-driver, set emulator-flag and change
 367                          * Layer-2 to transparent
 368                          */
 369                         if (!(features & l2_feature)) {
 370                                 dev->v110emu[idx] = l2prot;
 371                                 cmd->arg = (cmd->arg & 255) |
 372                                         (ISDN_PROTO_L2_TRANS << 8);
 373                         } else
 374                                 dev->v110emu[idx] = 0;
 375                 }
 376         }
 377         return dev->drv[cmd->driver]->interface->command(cmd);
 378 }
 379
 380 void
 381 isdn_all_eaz(int di, int ch)
 382 {
 383         isdn_ctrl cmd;
 384
 385         if (di < 0)
 386                 return;
 387         cmd.driver = di;
 388         cmd.arg = ch;
 389         cmd.command = ISDN_CMD_SETEAZ;
 390         cmd.parm.num[0] = '\0';
 391         isdn_command(&cmd);
 392 }
 393
 394 /*
 395  * Begin of a CAPI like LL<->HL interface, currently used only for
 396  * supplementary service (CAPI 2.0 part III)
 397  */
 398 #include <linux/isdn/capicmd.h>
 399
 400 static int
 401 isdn_capi_rec_hl_msg(capi_msg *cm)
 402 {
 403         switch (cm->Command) {
 404         case CAPI_FACILITY:
 405                 /* in the moment only handled in tty */
 406                 return (isdn_tty_capi_facility(cm));
 407         default:
 408                 return (-1);
 409         }
 410 }
 411
 412 static int
 413 isdn_status_callback(isdn_ctrl *c)
 414 {
 415         int di;
 416         u_long flags;
 417         int i;
 418         int r;
 419         int retval = 0;
 420         isdn_ctrl cmd;
 421         isdn_net_dev *p;
 422
 423         di = c->driver;
 424         i = isdn_dc2minor(di, c->arg);
 425         switch (c->command) {
 426         case ISDN_STAT_BSENT:
 427                 if (i < 0)
 428                         return -1;
 429                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 430                         return 0;
 431                 if (isdn_net_stat_callback(i, c))
 432                         return 0;
 433                 if (isdn_v110_stat_callback(i, c))
 434                         return 0;
 435                 if (isdn_tty_stat_callback(i, c))
 436                         return 0;
 437                 wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
 438                 break;
 439         case ISDN_STAT_STAVAIL:
 440                 dev->drv[di]->stavail += c->arg;
 441                 wake_up_interruptible(&dev->drv[di]->st_waitq);
 442                 break;
 443         case ISDN_STAT_RUN:
 444                 dev->drv[di]->flags |= DRV_FLAG_RUNNING;
 445                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 446                         if (dev->drvmap[i] == di)
 447                                 isdn_all_eaz(di, dev->chanmap[i]);
 448                 set_global_features();
 449                 break;
 450         case ISDN_STAT_STOP:
 451                 dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
 452                 break;
 453         case ISDN_STAT_ICALL:
 454                 if (i < 0)
 455                         return -1;
 456 #ifdef ISDN_DEBUG_STATCALLB
 457                 printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
 458 #endif
 459                 if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
 460                         cmd.driver = di;
 461                         cmd.arg = c->arg;
 462                         cmd.command = ISDN_CMD_HANGUP;
 463                         isdn_command(&cmd);
 464                         return 0;
 465                 }
 466                 /* Try to find a network-interface which will accept incoming call */
 467                 r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
 468                 switch (r) {
 469                 case 0:
 470                         /* No network-device replies.
 471                          * Try ttyI's.
 472                          * These return 0 on no match, 1 on match and
 473                          * 3 on eventually match, if CID is longer.
 474                          */
 475                         if (c->command == ISDN_STAT_ICALL)
 476                                 if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return (retval);
 477 #ifdef CONFIG_ISDN_DIVERSION
 478                         if (divert_if)
 479                                 if ((retval = divert_if->stat_callback(c)))
 480                                         return (retval); /* processed */
 481 #endif /* CONFIG_ISDN_DIVERSION */
 482                         if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
 483                                 /* No tty responding */
 484                                 cmd.driver = di;
 485                                 cmd.arg = c->arg;
 486                                 cmd.command = ISDN_CMD_HANGUP;
 487                                 isdn_command(&cmd);
 488                                 retval = 2;
 489                         }
 490                         break;
 491                 case 1:
 492                         /* Schedule connection-setup */
 493                         isdn_net_dial();
 494                         cmd.driver = di;
 495                         cmd.arg = c->arg;
 496                         cmd.command = ISDN_CMD_ACCEPTD;
 497                         for (p = dev->netdev; p; p = p->next)
 498                                 if (p->local->isdn_channel == cmd.arg)
 499                                 {
 500                                         strcpy(cmd.parm.setup.eazmsn, p->local->msn);
 501                                         isdn_command(&cmd);
 502                                         retval = 1;
 503                                         break;
 504                                 }
 505                         break;
 506
 507                 case 2: /* For calling back, first reject incoming call ... */
 508                 case 3: /* Interface found, but down, reject call actively  */
 509                         retval = 2;
 510                         printk(KERN_INFO "isdn: Rejecting Call\n");
 511                         cmd.driver = di;
 512                         cmd.arg = c->arg;
 513                         cmd.command = ISDN_CMD_HANGUP;
 514                         isdn_command(&cmd);
 515                         if (r == 3)
 516                                 break;
 517                         /* Fall through */
 518                 case 4:
 519                         /* ... then start callback. */
 520                         isdn_net_dial();
 521                         break;
 522                 case 5:
 523                         /* Number would eventually match, if longer */
 524                         retval = 3;
 525                         break;
 526                 }
 527 #ifdef ISDN_DEBUG_STATCALLB
 528                 printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
 529 #endif
 530                 return retval;
 531                 break;
 532         case ISDN_STAT_CINF:
 533                 if (i < 0)
 534                         return -1;
 535 #ifdef ISDN_DEBUG_STATCALLB
 536                 printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
 537 #endif
 538                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 539                         return 0;
 540                 if (strcmp(c->parm.num, "0"))
 541                         isdn_net_stat_callback(i, c);
 542                 isdn_tty_stat_callback(i, c);
 543                 break;
 544         case ISDN_STAT_CAUSE:
 545 #ifdef ISDN_DEBUG_STATCALLB
 546                 printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
 547 #endif
 548                 printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
 549                        dev->drvid[di], c->arg, c->parm.num);
 550                 isdn_tty_stat_callback(i, c);
 551 #ifdef CONFIG_ISDN_DIVERSION
 552                 if (divert_if)
 553                         divert_if->stat_callback(c);
 554 #endif /* CONFIG_ISDN_DIVERSION */
 555                 break;
 556         case ISDN_STAT_DISPLAY:
 557 #ifdef ISDN_DEBUG_STATCALLB
 558                 printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
 559 #endif
 560                 isdn_tty_stat_callback(i, c);
 561 #ifdef CONFIG_ISDN_DIVERSION
 562                 if (divert_if)
 563                         divert_if->stat_callback(c);
 564 #endif /* CONFIG_ISDN_DIVERSION */
 565                 break;
 566         case ISDN_STAT_DCONN:
 567                 if (i < 0)
 568                         return -1;
 569 #ifdef ISDN_DEBUG_STATCALLB
 570                 printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
 571 #endif
 572                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 573                         return 0;
 574                 /* Find any net-device, waiting for D-channel setup */
 575                 if (isdn_net_stat_callback(i, c))
 576                         break;
 577                 isdn_v110_stat_callback(i, c);
 578                 /* Find any ttyI, waiting for D-channel setup */
 579                 if (isdn_tty_stat_callback(i, c)) {
 580                         cmd.driver = di;
 581                         cmd.arg = c->arg;
 582                         cmd.command = ISDN_CMD_ACCEPTB;
 583                         isdn_command(&cmd);
 584                         break;
 585                 }
 586                 break;
 587         case ISDN_STAT_DHUP:
 588                 if (i < 0)
 589                         return -1;
 590 #ifdef ISDN_DEBUG_STATCALLB
 591                 printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
 592 #endif
 593                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 594                         return 0;
 595                 dev->drv[di]->online &= ~(1 << (c->arg));
 596                 isdn_info_update();
 597                 /* Signal hangup to network-devices */
 598                 if (isdn_net_stat_callback(i, c))
 599                         break;
 600                 isdn_v110_stat_callback(i, c);
 601                 if (isdn_tty_stat_callback(i, c))
 602                         break;
 603 #ifdef CONFIG_ISDN_DIVERSION
 604                 if (divert_if)
 605                         divert_if->stat_callback(c);
 606 #endif /* CONFIG_ISDN_DIVERSION */
 607                 break;
 608                 break;
 609         case ISDN_STAT_BCONN:
 610                 if (i < 0)
 611                         return -1;
 612 #ifdef ISDN_DEBUG_STATCALLB
 613                 printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
 614 #endif
 615                 /* Signal B-channel-connect to network-devices */
 616                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 617                         return 0;
 618                 dev->drv[di]->online |= (1 << (c->arg));
 619                 isdn_info_update();
 620                 if (isdn_net_stat_callback(i, c))
 621                         break;
 622                 isdn_v110_stat_callback(i, c);
 623                 if (isdn_tty_stat_callback(i, c))
 624                         break;
 625                 break;
 626         case ISDN_STAT_BHUP:
 627                 if (i < 0)
 628                         return -1;
 629 #ifdef ISDN_DEBUG_STATCALLB
 630                 printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
 631 #endif
 632                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 633                         return 0;
 634                 dev->drv[di]->online &= ~(1 << (c->arg));
 635                 isdn_info_update();
 636 #ifdef CONFIG_ISDN_X25
 637                 /* Signal hangup to network-devices */
 638                 if (isdn_net_stat_callback(i, c))
 639                         break;
 640 #endif
 641                 isdn_v110_stat_callback(i, c);
 642                 if (isdn_tty_stat_callback(i, c))
 643                         break;
 644                 break;
 645         case ISDN_STAT_NODCH:
 646                 if (i < 0)
 647                         return -1;
 648 #ifdef ISDN_DEBUG_STATCALLB
 649                 printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
 650 #endif
 651                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 652                         return 0;
 653                 if (isdn_net_stat_callback(i, c))
 654                         break;
 655                 if (isdn_tty_stat_callback(i, c))
 656                         break;
 657                 break;
 658         case ISDN_STAT_ADDCH:
 659                 spin_lock_irqsave(&dev->lock, flags);
 660                 if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
 661                         spin_unlock_irqrestore(&dev->lock, flags);
 662                         return -1;
 663                 }
 664                 spin_unlock_irqrestore(&dev->lock, flags);
 665                 isdn_info_update();
 666                 break;
 667         case ISDN_STAT_DISCH:
 668                 spin_lock_irqsave(&dev->lock, flags);
 669                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 670                         if ((dev->drvmap[i] == di) &&
 671                             (dev->chanmap[i] == c->arg)) {
 672                                 if (c->parm.num[0])
 673                                         dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 674                                 else
 675                                         if (USG_NONE(dev->usage[i])) {
 676                                                 dev->usage[i] |= ISDN_USAGE_DISABLED;
 677                                         }
 678                                         else
 679                                                 retval = -1;
 680                                 break;
 681                         }
 682                 spin_unlock_irqrestore(&dev->lock, flags);
 683                 isdn_info_update();
 684                 break;
 685         case ISDN_STAT_UNLOAD:
 686                 while (dev->drv[di]->locks > 0) {
 687                         isdn_unlock_driver(dev->drv[di]);
 688                 }
 689                 spin_lock_irqsave(&dev->lock, flags);
 690                 isdn_tty_stat_callback(i, c);
 691                 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 692                         if (dev->drvmap[i] == di) {
 693                                 dev->drvmap[i] = -1;
 694                                 dev->chanmap[i] = -1;
 695                                 dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 696                         }
 697                 dev->drivers--;
 698                 dev->channels -= dev->drv[di]->channels;
 699                 kfree(dev->drv[di]->rcverr);
 700                 kfree(dev->drv[di]->rcvcount);
 701                 for (i = 0; i < dev->drv[di]->channels; i++)
 702                         skb_queue_purge(&dev->drv[di]->rpqueue[i]);
 703                 kfree(dev->drv[di]->rpqueue);
 704                 kfree(dev->drv[di]->rcv_waitq);
 705                 kfree(dev->drv[di]);
 706                 dev->drv[di] = NULL;
 707                 dev->drvid[di][0] = '\0';
 708                 isdn_info_update();
 709                 set_global_features();
 710                 spin_unlock_irqrestore(&dev->lock, flags);
 711                 return 0;
 712         case ISDN_STAT_L1ERR:
 713                 break;
 714         case CAPI_PUT_MESSAGE:
 715                 return (isdn_capi_rec_hl_msg(&c->parm.cmsg));
 716 #ifdef CONFIG_ISDN_TTY_FAX
 717         case ISDN_STAT_FAXIND:
 718                 isdn_tty_stat_callback(i, c);
 719                 break;
 720 #endif
 721 #ifdef CONFIG_ISDN_AUDIO
 722         case ISDN_STAT_AUDIO:
 723                 isdn_tty_stat_callback(i, c);
 724                 break;
 725 #endif
 726 #ifdef CONFIG_ISDN_DIVERSION
 727         case ISDN_STAT_PROT:
 728         case ISDN_STAT_REDIR:
 729                 if (divert_if)
 730                         return (divert_if->stat_callback(c));
 731 #endif /* CONFIG_ISDN_DIVERSION */
 732         default:
 733                 return -1;
 734         }
 735         return 0;
 736 }
 737
 738 /*
 739  * Get integer from char-pointer, set pointer to end of number
 740  */
 741 int
 742 isdn_getnum(char **p)
 743 {
 744         int v = -1;
 745
 746         while (*p[0] >= '0' && *p[0] <= '9')
 747                 v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
 748         return v;
 749 }
 750
 751 #define DLE 0x10
 752
 753 /*
 754  * isdn_readbchan() tries to get data from the read-queue.
 755  * It MUST be called with interrupts off.
 756  *
 757  * Be aware that this is not an atomic operation when sleep != 0, even though
 758  * interrupts are turned off! Well, like that we are currently only called
 759  * on behalf of a read system call on raw device files (which are documented
 760  * to be dangerous and for debugging purpose only). The inode semaphore
 761  * takes care that this is not called for the same minor device number while
 762  * we are sleeping, but access is not serialized against simultaneous read()
 763  * from the corresponding ttyI device. Can other ugly events, like changes
 764  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 765  */
 766 int
 767 isdn_readbchan(int di, int channel, u_char *buf, u_char *fp, int len, wait_queue_head_t *sleep)
 768 {
 769         int count;
 770         int count_pull;
 771         int count_put;
 772         int dflag;
 773         struct sk_buff *skb;
 774         u_char *cp;
 775
 776         if (!dev->drv[di])
 777                 return 0;
 778         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
 779                 if (sleep)
 780                         wait_event_interruptible(*sleep,
 781                                 !skb_queue_empty(&dev->drv[di]->rpqueue[channel]));
 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_port *port, 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(port, 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(port, 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(port, 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(port, last, 0xFF);
 957                         else
 958                                 tty_insert_flip_char(port, 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(port, 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_inode(file));
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                         wait_event_interruptible(dev->info_waitq,
1077                                                  file->private_data);
1078                 }
1079                 p = isdn_statstr();
1080                 file->private_data = NULL;
1081                 if ((len = strlen(p)) <= count) {
1082                         if (copy_to_user(buf, p, len)) {
1083                                 retval = -EFAULT;
1084                                 goto out;
1085                         }
1086                         *off += len;
1087                         retval = len;
1088                         goto out;
1089                 }
1090                 retval = 0;
1091                 goto out;
1092         }
1093         if (!dev->drivers) {
1094                 retval = -ENODEV;
1095                 goto out;
1096         }
1097         if (minor <= ISDN_MINOR_BMAX) {
1098                 printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1099                 drvidx = isdn_minor2drv(minor);
1100                 if (drvidx < 0) {
1101                         retval = -ENODEV;
1102                         goto out;
1103                 }
1104                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1105                         retval = -ENODEV;
1106                         goto out;
1107                 }
1108                 chidx = isdn_minor2chan(minor);
1109                 if (!(p = kmalloc(count, GFP_KERNEL))) {
1110                         retval = -ENOMEM;
1111                         goto out;
1112                 }
1113                 len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1114                                      &dev->drv[drvidx]->rcv_waitq[chidx]);
1115                 *off += len;
1116                 if (copy_to_user(buf, p, len))
1117                         len = -EFAULT;
1118                 kfree(p);
1119                 retval = len;
1120                 goto out;
1121         }
1122         if (minor <= ISDN_MINOR_CTRLMAX) {
1123                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1124                 if (drvidx < 0) {
1125                         retval = -ENODEV;
1126                         goto out;
1127                 }
1128                 if (!dev->drv[drvidx]->stavail) {
1129                         if (file->f_flags & O_NONBLOCK) {
1130                                 retval = -EAGAIN;
1131                                 goto out;
1132                         }
1133                         wait_event_interruptible(dev->drv[drvidx]->st_waitq,
1134                                                  dev->drv[drvidx]->stavail);
1135                 }
1136                 if (dev->drv[drvidx]->interface->readstat) {
1137                         if (count > dev->drv[drvidx]->stavail)
1138                                 count = dev->drv[drvidx]->stavail;
1139                         len = dev->drv[drvidx]->interface->readstat(buf, count,
1140                                                                     drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1141                         if (len < 0) {
1142                                 retval = len;
1143                                 goto out;
1144                         }
1145                 } else {
1146                         len = 0;
1147                 }
1148                 if (len)
1149                         dev->drv[drvidx]->stavail -= len;
1150                 else
1151                         dev->drv[drvidx]->stavail = 0;
1152                 *off += len;
1153                 retval = len;
1154                 goto out;
1155         }
1156 #ifdef CONFIG_ISDN_PPP
1157         if (minor <= ISDN_MINOR_PPPMAX) {
1158                 retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1159                 goto out;
1160         }
1161 #endif
1162         retval = -ENODEV;
1163 out:
1164         mutex_unlock(&isdn_mutex);
1165         return retval;
1166 }
1167
1168 static ssize_t
1169 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
1170 {
1171         uint minor = iminor(file_inode(file));
1172         int drvidx;
1173         int chidx;
1174         int retval;
1175
1176         if (minor == ISDN_MINOR_STATUS)
1177                 return -EPERM;
1178         if (!dev->drivers)
1179                 return -ENODEV;
1180
1181         mutex_lock(&isdn_mutex);
1182         if (minor <= ISDN_MINOR_BMAX) {
1183                 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1184                 drvidx = isdn_minor2drv(minor);
1185                 if (drvidx < 0) {
1186                         retval = -ENODEV;
1187                         goto out;
1188                 }
1189                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1190                         retval = -ENODEV;
1191                         goto out;
1192                 }
1193                 chidx = isdn_minor2chan(minor);
1194                 wait_event_interruptible(dev->drv[drvidx]->snd_waitq[chidx],
1195                         (retval = isdn_writebuf_stub(drvidx, chidx, buf, count)));
1196                 goto out;
1197         }
1198         if (minor <= ISDN_MINOR_CTRLMAX) {
1199                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1200                 if (drvidx < 0) {
1201                         retval = -ENODEV;
1202                         goto out;
1203                 }
1204                 /*
1205                  * We want to use the isdnctrl device to load the firmware
1206                  *
1207                  if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1208                  return -ENODEV;
1209                 */
1210                 if (dev->drv[drvidx]->interface->writecmd)
1211                         retval = dev->drv[drvidx]->interface->
1212                                 writecmd(buf, count, drvidx,
1213                                          isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1214                 else
1215                         retval = count;
1216                 goto out;
1217         }
1218 #ifdef CONFIG_ISDN_PPP
1219         if (minor <= ISDN_MINOR_PPPMAX) {
1220                 retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1221                 goto out;
1222         }
1223 #endif
1224         retval = -ENODEV;
1225 out:
1226         mutex_unlock(&isdn_mutex);
1227         return retval;
1228 }
1229
1230 static __poll_t
1231 isdn_poll(struct file *file, poll_table *wait)
1232 {
1233         __poll_t mask = 0;
1234         unsigned int minor = iminor(file_inode(file));
1235         int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1236
1237         mutex_lock(&isdn_mutex);
1238         if (minor == ISDN_MINOR_STATUS) {
1239                 poll_wait(file, &(dev->info_waitq), wait);
1240                 /* mask = EPOLLOUT | EPOLLWRNORM; */
1241                 if (file->private_data) {
1242                         mask |= EPOLLIN | EPOLLRDNORM;
1243                 }
1244                 goto out;
1245         }
1246         if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1247                 if (drvidx < 0) {
1248                         /* driver deregistered while file open */
1249                         mask = EPOLLHUP;
1250                         goto out;
1251                 }
1252                 poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1253                 mask = EPOLLOUT | EPOLLWRNORM;
1254                 if (dev->drv[drvidx]->stavail) {
1255                         mask |= EPOLLIN | EPOLLRDNORM;
1256                 }
1257                 goto out;
1258         }
1259 #ifdef CONFIG_ISDN_PPP
1260         if (minor <= ISDN_MINOR_PPPMAX) {
1261                 mask = isdn_ppp_poll(file, wait);
1262                 goto out;
1263         }
1264 #endif
1265         mask = EPOLLERR;
1266 out:
1267         mutex_unlock(&isdn_mutex);
1268         return mask;
1269 }
1270
1271
1272 static int
1273 isdn_ioctl(struct file *file, uint cmd, ulong arg)
1274 {
1275         uint minor = iminor(file_inode(file));
1276         isdn_ctrl c;
1277         int drvidx;
1278         int ret;
1279         int i;
1280         char __user *p;
1281         char *s;
1282         union iocpar {
1283                 char name[10];
1284                 char bname[22];
1285                 isdn_ioctl_struct iocts;
1286                 isdn_net_ioctl_phone phone;
1287                 isdn_net_ioctl_cfg cfg;
1288         } iocpar;
1289         void __user *argp = (void __user *)arg;
1290
1291 #define name  iocpar.name
1292 #define bname iocpar.bname
1293 #define iocts iocpar.iocts
1294 #define phone iocpar.phone
1295 #define cfg   iocpar.cfg
1296
1297         if (minor == ISDN_MINOR_STATUS) {
1298                 switch (cmd) {
1299                 case IIOCGETDVR:
1300                         return (TTY_DV +
1301                                 (NET_DV << 8) +
1302                                 (INF_DV << 16));
1303                 case IIOCGETCPS:
1304                         if (arg) {
1305                                 ulong __user *p = argp;
1306                                 int i;
1307                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1308                                         put_user(dev->ibytes[i], p++);
1309                                         put_user(dev->obytes[i], p++);
1310                                 }
1311                                 return 0;
1312                         } else
1313                                 return -EINVAL;
1314                         break;
1315                 case IIOCNETGPN:
1316                         /* Get peer phone number of a connected
1317                          * isdn network interface */
1318                         if (arg) {
1319                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1320                                         return -EFAULT;
1321                                 return isdn_net_getpeer(&phone, argp);
1322                         } else
1323                                 return -EINVAL;
1324                 default:
1325                         return -EINVAL;
1326                 }
1327         }
1328         if (!dev->drivers)
1329                 return -ENODEV;
1330         if (minor <= ISDN_MINOR_BMAX) {
1331                 drvidx = isdn_minor2drv(minor);
1332                 if (drvidx < 0)
1333                         return -ENODEV;
1334                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1335                         return -ENODEV;
1336                 return 0;
1337         }
1338         if (minor <= ISDN_MINOR_CTRLMAX) {
1339 /*
1340  * isdn net devices manage lots of configuration variables as linked lists.
1341  * Those lists must only be manipulated from user space. Some of the ioctl's
1342  * service routines access user space and are not atomic. Therefore, ioctl's
1343  * manipulating the lists and ioctl's sleeping while accessing the lists
1344  * are serialized by means of a semaphore.
1345  */
1346                 switch (cmd) {
1347                 case IIOCNETDWRSET:
1348                         printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1349                         return (-EINVAL);
1350                 case IIOCNETLCR:
1351                         printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1352                         return -ENODEV;
1353                 case IIOCNETAIF:
1354                         /* Add a network-interface */
1355                         if (arg) {
1356                                 if (copy_from_user(name, argp, sizeof(name)))
1357                                         return -EFAULT;
1358                                 s = name;
1359                         } else {
1360                                 s = NULL;
1361                         }
1362                         ret = mutex_lock_interruptible(&dev->mtx);
1363                         if (ret) return ret;
1364                         if ((s = isdn_net_new(s, NULL))) {
1365                                 if (copy_to_user(argp, s, strlen(s) + 1)) {
1366                                         ret = -EFAULT;
1367                                 } else {
1368                                         ret = 0;
1369                                 }
1370                         } else
1371                                 ret = -ENODEV;
1372                         mutex_unlock(&dev->mtx);
1373                         return ret;
1374                 case IIOCNETASL:
1375                         /* Add a slave to a network-interface */
1376                         if (arg) {
1377                                 if (copy_from_user(bname, argp, sizeof(bname) - 1))
1378                                         return -EFAULT;
1379                                 bname[sizeof(bname)-1] = 0;
1380                         } else
1381                                 return -EINVAL;
1382                         ret = mutex_lock_interruptible(&dev->mtx);
1383                         if (ret) return ret;
1384                         if ((s = isdn_net_newslave(bname))) {
1385                                 if (copy_to_user(argp, s, strlen(s) + 1)) {
1386                                         ret = -EFAULT;
1387                                 } else {
1388                                         ret = 0;
1389                                 }
1390                         } else
1391                                 ret = -ENODEV;
1392                         mutex_unlock(&dev->mtx);
1393                         return ret;
1394                 case IIOCNETDIF:
1395                         /* Delete a network-interface */
1396                         if (arg) {
1397                                 if (copy_from_user(name, argp, sizeof(name)))
1398                                         return -EFAULT;
1399                                 ret = mutex_lock_interruptible(&dev->mtx);
1400                                 if (ret) return ret;
1401                                 ret = isdn_net_rm(name);
1402                                 mutex_unlock(&dev->mtx);
1403                                 return ret;
1404                         } else
1405                                 return -EINVAL;
1406                 case IIOCNETSCF:
1407                         /* Set configurable parameters of a network-interface */
1408                         if (arg) {
1409                                 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1410                                         return -EFAULT;
1411                                 return isdn_net_setcfg(&cfg);
1412                         } else
1413                                 return -EINVAL;
1414                 case IIOCNETGCF:
1415                         /* Get configurable parameters of a network-interface */
1416                         if (arg) {
1417                                 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1418                                         return -EFAULT;
1419                                 if (!(ret = isdn_net_getcfg(&cfg))) {
1420                                         if (copy_to_user(argp, &cfg, sizeof(cfg)))
1421                                                 return -EFAULT;
1422                                 }
1423                                 return ret;
1424                         } else
1425                                 return -EINVAL;
1426                 case IIOCNETANM:
1427                         /* Add a phone-number to a network-interface */
1428                         if (arg) {
1429                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1430                                         return -EFAULT;
1431                                 ret = mutex_lock_interruptible(&dev->mtx);
1432                                 if (ret) return ret;
1433                                 ret = isdn_net_addphone(&phone);
1434                                 mutex_unlock(&dev->mtx);
1435                                 return ret;
1436                         } else
1437                                 return -EINVAL;
1438                 case IIOCNETGNM:
1439                         /* Get list of phone-numbers of a network-interface */
1440                         if (arg) {
1441                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1442                                         return -EFAULT;
1443                                 ret = mutex_lock_interruptible(&dev->mtx);
1444                                 if (ret) return ret;
1445                                 ret = isdn_net_getphones(&phone, argp);
1446                                 mutex_unlock(&dev->mtx);
1447                                 return ret;
1448                         } else
1449                                 return -EINVAL;
1450                 case IIOCNETDNM:
1451                         /* Delete a phone-number of a network-interface */
1452                         if (arg) {
1453                                 if (copy_from_user(&phone, argp, sizeof(phone)))
1454                                         return -EFAULT;
1455                                 ret = mutex_lock_interruptible(&dev->mtx);
1456                                 if (ret) return ret;
1457                                 ret = isdn_net_delphone(&phone);
1458                                 mutex_unlock(&dev->mtx);
1459                                 return ret;
1460                         } else
1461                                 return -EINVAL;
1462                 case IIOCNETDIL:
1463                         /* Force dialing of a network-interface */
1464                         if (arg) {
1465                                 if (copy_from_user(name, argp, sizeof(name)))
1466                                         return -EFAULT;
1467                                 return isdn_net_force_dial(name);
1468                         } else
1469                                 return -EINVAL;
1470 #ifdef CONFIG_ISDN_PPP
1471                 case IIOCNETALN:
1472                         if (!arg)
1473                                 return -EINVAL;
1474                         if (copy_from_user(name, argp, sizeof(name)))
1475                                 return -EFAULT;
1476                         return isdn_ppp_dial_slave(name);
1477                 case IIOCNETDLN:
1478                         if (!arg)
1479                                 return -EINVAL;
1480                         if (copy_from_user(name, argp, sizeof(name)))
1481                                 return -EFAULT;
1482                         return isdn_ppp_hangup_slave(name);
1483 #endif
1484                 case IIOCNETHUP:
1485                         /* Force hangup of a network-interface */
1486                         if (!arg)
1487                                 return -EINVAL;
1488                         if (copy_from_user(name, argp, sizeof(name)))
1489                                 return -EFAULT;
1490                         return isdn_net_force_hangup(name);
1491                         break;
1492                 case IIOCSETVER:
1493                         dev->net_verbose = arg;
1494                         printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1495                         return 0;
1496                 case IIOCSETGST:
1497                         if (arg)
1498                                 dev->global_flags |= ISDN_GLOBAL_STOPPED;
1499                         else
1500                                 dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1501                         printk(KERN_INFO "isdn: Global Mode %s\n",
1502                                (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1503                         return 0;
1504                 case IIOCSETBRJ:
1505                         drvidx = -1;
1506                         if (arg) {
1507                                 int i;
1508                                 char *p;
1509                                 if (copy_from_user(&iocts, argp,
1510                                                    sizeof(isdn_ioctl_struct)))
1511                                         return -EFAULT;
1512                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1513                                 if (strlen(iocts.drvid)) {
1514                                         if ((p = strchr(iocts.drvid, ',')))
1515                                                 *p = 0;
1516                                         drvidx = -1;
1517                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1518                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1519                                                         drvidx = i;
1520                                                         break;
1521                                                 }
1522                                 }
1523                         }
1524                         if (drvidx == -1)
1525                                 return -ENODEV;
1526                         if (iocts.arg)
1527                                 dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1528                         else
1529                                 dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1530                         return 0;
1531                 case IIOCSIGPRF:
1532                         dev->profd = current;
1533                         return 0;
1534                         break;
1535                 case IIOCGETPRF:
1536                         /* Get all Modem-Profiles */
1537                         if (arg) {
1538                                 char __user *p = argp;
1539                                 int i;
1540
1541                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1542                                         if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1543                                                          ISDN_MODEM_NUMREG))
1544                                                 return -EFAULT;
1545                                         p += ISDN_MODEM_NUMREG;
1546                                         if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1547                                                 return -EFAULT;
1548                                         p += ISDN_MSNLEN;
1549                                         if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1550                                                 return -EFAULT;
1551                                         p += ISDN_LMSNLEN;
1552                                 }
1553                                 return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1554                         } else
1555                                 return -EINVAL;
1556                         break;
1557                 case IIOCSETPRF:
1558                         /* Set all Modem-Profiles */
1559                         if (arg) {
1560                                 char __user *p = argp;
1561                                 int i;
1562
1563                                 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1564                                         if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1565                                                            ISDN_MODEM_NUMREG))
1566                                                 return -EFAULT;
1567                                         p += ISDN_MODEM_NUMREG;
1568                                         if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1569                                                 return -EFAULT;
1570                                         p += ISDN_LMSNLEN;
1571                                         if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1572                                                 return -EFAULT;
1573                                         p += ISDN_MSNLEN;
1574                                 }
1575                                 return 0;
1576                         } else
1577                                 return -EINVAL;
1578                         break;
1579                 case IIOCSETMAP:
1580                 case IIOCGETMAP:
1581                         /* Set/Get MSN->EAZ-Mapping for a driver */
1582                         if (arg) {
1583
1584                                 if (copy_from_user(&iocts, argp,
1585                                                    sizeof(isdn_ioctl_struct)))
1586                                         return -EFAULT;
1587                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1588                                 if (strlen(iocts.drvid)) {
1589                                         drvidx = -1;
1590                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1591                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1592                                                         drvidx = i;
1593                                                         break;
1594                                                 }
1595                                 } else
1596                                         drvidx = 0;
1597                                 if (drvidx == -1)
1598                                         return -ENODEV;
1599                                 if (cmd == IIOCSETMAP) {
1600                                         int loop = 1;
1601
1602                                         p = (char __user *) iocts.arg;
1603                                         i = 0;
1604                                         while (loop) {
1605                                                 int j = 0;
1606
1607                                                 while (1) {
1608                                                         get_user(bname[j], p++);
1609                                                         switch (bname[j]) {
1610                                                         case '\0':
1611                                                                 loop = 0;
1612                                                                 /* Fall through */
1613                                                         case ',':
1614                                                                 bname[j] = '\0';
1615                                                                 strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1616                                                                 j = ISDN_MSNLEN;
1617                                                                 break;
1618                                                         default:
1619                                                                 j++;
1620                                                         }
1621                                                         if (j >= ISDN_MSNLEN)
1622                                                                 break;
1623                                                 }
1624                                                 if (++i > 9)
1625                                                         break;
1626                                         }
1627                                 } else {
1628                                         p = (char __user *) iocts.arg;
1629                                         for (i = 0; i < 10; i++) {
1630                                                 snprintf(bname, sizeof(bname), "%s%s",
1631                                                          strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1632                                                          dev->drv[drvidx]->msn2eaz[i] : "_",
1633                                                          (i < 9) ? "," : "\0");
1634                                                 if (copy_to_user(p, bname, strlen(bname) + 1))
1635                                                         return -EFAULT;
1636                                                 p += strlen(bname);
1637                                         }
1638                                 }
1639                                 return 0;
1640                         } else
1641                                 return -EINVAL;
1642                 case IIOCDBGVAR:
1643                         return -EINVAL;
1644                 default:
1645                         if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1646                                 cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1647                         else
1648                                 return -EINVAL;
1649                         if (arg) {
1650                                 int i;
1651                                 char *p;
1652                                 if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1653                                         return -EFAULT;
1654                                 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1655                                 if (strlen(iocts.drvid)) {
1656                                         if ((p = strchr(iocts.drvid, ',')))
1657                                                 *p = 0;
1658                                         drvidx = -1;
1659                                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1660                                                 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1661                                                         drvidx = i;
1662                                                         break;
1663                                                 }
1664                                 } else
1665                                         drvidx = 0;
1666                                 if (drvidx == -1)
1667                                         return -ENODEV;
1668                                 c.driver = drvidx;
1669                                 c.command = ISDN_CMD_IOCTL;
1670                                 c.arg = cmd;
1671                                 memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1672                                 ret = isdn_command(&c);
1673                                 memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1674                                 if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1675                                         return -EFAULT;
1676                                 return ret;
1677                         } else
1678                                 return -EINVAL;
1679                 }
1680         }
1681 #ifdef CONFIG_ISDN_PPP
1682         if (minor <= ISDN_MINOR_PPPMAX)
1683                 return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1684 #endif
1685         return -ENODEV;
1686
1687 #undef name
1688 #undef bname
1689 #undef iocts
1690 #undef phone
1691 #undef cfg
1692 }
1693
1694 static long
1695 isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1696 {
1697         int ret;
1698
1699         mutex_lock(&isdn_mutex);
1700         ret = isdn_ioctl(file, cmd, arg);
1701         mutex_unlock(&isdn_mutex);
1702
1703         return ret;
1704 }
1705
1706 /*
1707  * Open the device code.
1708  */
1709 static int
1710 isdn_open(struct inode *ino, struct file *filep)
1711 {
1712         uint minor = iminor(ino);
1713         int drvidx;
1714         int chidx;
1715         int retval = -ENODEV;
1716
1717         mutex_lock(&isdn_mutex);
1718         if (minor == ISDN_MINOR_STATUS) {
1719                 infostruct *p;
1720
1721                 if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1722                         p->next = (char *) dev->infochain;
1723                         p->private = (char *) &(filep->private_data);
1724                         dev->infochain = p;
1725                         /* At opening we allow a single update */
1726                         filep->private_data = (char *) 1;
1727                         retval = 0;
1728                         goto out;
1729                 } else {
1730                         retval = -ENOMEM;
1731                         goto out;
1732                 }
1733         }
1734         if (!dev->channels)
1735                 goto out;
1736         if (minor <= ISDN_MINOR_BMAX) {
1737                 printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1738                 drvidx = isdn_minor2drv(minor);
1739                 if (drvidx < 0)
1740                         goto out;
1741                 chidx = isdn_minor2chan(minor);
1742                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1743                         goto out;
1744                 if (!(dev->drv[drvidx]->online & (1 << chidx)))
1745                         goto out;
1746                 isdn_lock_drivers();
1747                 retval = 0;
1748                 goto out;
1749         }
1750         if (minor <= ISDN_MINOR_CTRLMAX) {
1751                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1752                 if (drvidx < 0)
1753                         goto out;
1754                 isdn_lock_drivers();
1755                 retval = 0;
1756                 goto out;
1757         }
1758 #ifdef CONFIG_ISDN_PPP
1759         if (minor <= ISDN_MINOR_PPPMAX) {
1760                 retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1761                 if (retval == 0)
1762                         isdn_lock_drivers();
1763                 goto out;
1764         }
1765 #endif
1766 out:
1767         nonseekable_open(ino, filep);
1768         mutex_unlock(&isdn_mutex);
1769         return retval;
1770 }
1771
1772 static int
1773 isdn_close(struct inode *ino, struct file *filep)
1774 {
1775         uint minor = iminor(ino);
1776
1777         mutex_lock(&isdn_mutex);
1778         if (minor == ISDN_MINOR_STATUS) {
1779                 infostruct *p = dev->infochain;
1780                 infostruct *q = NULL;
1781
1782                 while (p) {
1783                         if (p->private == (char *) &(filep->private_data)) {
1784                                 if (q)
1785                                         q->next = p->next;
1786                                 else
1787                                         dev->infochain = (infostruct *) (p->next);
1788                                 kfree(p);
1789                                 goto out;
1790                         }
1791                         q = p;
1792                         p = (infostruct *) (p->next);
1793                 }
1794                 printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1795                 goto out;
1796         }
1797         isdn_unlock_drivers();
1798         if (minor <= ISDN_MINOR_BMAX)
1799                 goto out;
1800         if (minor <= ISDN_MINOR_CTRLMAX) {
1801                 if (dev->profd == current)
1802                         dev->profd = NULL;
1803                 goto out;
1804         }
1805 #ifdef CONFIG_ISDN_PPP
1806         if (minor <= ISDN_MINOR_PPPMAX)
1807                 isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1808 #endif
1809
1810 out:
1811         mutex_unlock(&isdn_mutex);
1812         return 0;
1813 }
1814
1815 static const struct file_operations isdn_fops =
1816 {
1817         .owner          = THIS_MODULE,
1818         .llseek         = no_llseek,
1819         .read           = isdn_read,
1820         .write          = isdn_write,
1821         .poll           = isdn_poll,
1822         .unlocked_ioctl = isdn_unlocked_ioctl,
1823         .open           = isdn_open,
1824         .release        = isdn_close,
1825 };
1826
1827 char *
1828 isdn_map_eaz2msn(char *msn, int di)
1829 {
1830         isdn_driver_t *this = dev->drv[di];
1831         int i;
1832
1833         if (strlen(msn) == 1) {
1834                 i = msn[0] - '0';
1835                 if ((i >= 0) && (i <= 9))
1836                         if (strlen(this->msn2eaz[i]))
1837                                 return (this->msn2eaz[i]);
1838         }
1839         return (msn);
1840 }
1841
1842 /*
1843  * Find an unused ISDN-channel, whose feature-flags match the
1844  * given L2- and L3-protocols.
1845  */
1846 #define L2V (~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038))
1847
1848 /*
1849  * This function must be called with holding the dev->lock.
1850  */
1851 int
1852 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1853                       , int pre_chan, char *msn)
1854 {
1855         int i;
1856         ulong features;
1857         ulong vfeatures;
1858
1859         features = ((1 << l2_proto) | (0x10000 << l3_proto));
1860         vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1861                      ~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038));
1862         /* If Layer-2 protocol is V.110, accept drivers with
1863          * transparent feature even if these don't support V.110
1864          * because we can emulate this in linklevel.
1865          */
1866         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1867                 if (USG_NONE(dev->usage[i]) &&
1868                     (dev->drvmap[i] != -1)) {
1869                         int d = dev->drvmap[i];
1870                         if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1871                             ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1872                                 continue;
1873                         if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1874                                 continue;
1875                         if (dev->usage[i] & ISDN_USAGE_DISABLED)
1876                                 continue; /* usage not allowed */
1877                         if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1878                                 if (((dev->drv[d]->interface->features & features) == features) ||
1879                                     (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1880                                      (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1881                                         if ((pre_dev < 0) || (pre_chan < 0)) {
1882                                                 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1883                                                 dev->usage[i] |= usage;
1884                                                 isdn_info_update();
1885                                                 return i;
1886                                         } else {
1887                                                 if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1888                                                         dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1889                                                         dev->usage[i] |= usage;
1890                                                         isdn_info_update();
1891                                                         return i;
1892                                                 }
1893                                         }
1894                                 }
1895                         }
1896                 }
1897         return -1;
1898 }
1899
1900 /*
1901  * Set state of ISDN-channel to 'unused'
1902  */
1903 void
1904 isdn_free_channel(int di, int ch, int usage)
1905 {
1906         int i;
1907
1908         if ((di < 0) || (ch < 0)) {
1909                 printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1910                        __func__, di, ch);
1911                 return;
1912         }
1913         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1914                 if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1915                     (dev->drvmap[i] == di) &&
1916                     (dev->chanmap[i] == ch)) {
1917                         dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1918                         strcpy(dev->num[i], "???");
1919                         dev->ibytes[i] = 0;
1920                         dev->obytes[i] = 0;
1921 // 20.10.99 JIM, try to reinitialize v110 !
1922                         dev->v110emu[i] = 0;
1923                         atomic_set(&(dev->v110use[i]), 0);
1924                         isdn_v110_close(dev->v110[i]);
1925                         dev->v110[i] = NULL;
1926 // 20.10.99 JIM, try to reinitialize v110 !
1927                         isdn_info_update();
1928                         if (dev->drv[di])
1929                                 skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1930                 }
1931 }
1932
1933 /*
1934  * Cancel Exclusive-Flag for ISDN-channel
1935  */
1936 void
1937 isdn_unexclusive_channel(int di, int ch)
1938 {
1939         int i;
1940
1941         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1942                 if ((dev->drvmap[i] == di) &&
1943                     (dev->chanmap[i] == ch)) {
1944                         dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1945                         isdn_info_update();
1946                         return;
1947                 }
1948 }
1949
1950 /*
1951  *  writebuf replacement for SKB_ABLE drivers
1952  */
1953 static int
1954 isdn_writebuf_stub(int drvidx, int chan, const u_char __user *buf, int len)
1955 {
1956         int ret;
1957         int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1958         struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1959
1960         if (!skb)
1961                 return -ENOMEM;
1962         skb_reserve(skb, hl);
1963         if (copy_from_user(skb_put(skb, len), buf, len)) {
1964                 dev_kfree_skb(skb);
1965                 return -EFAULT;
1966         }
1967         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1968         if (ret <= 0)
1969                 dev_kfree_skb(skb);
1970         if (ret > 0)
1971                 dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1972         return ret;
1973 }
1974
1975 /*
1976  * Return: length of data on success, -ERRcode on failure.
1977  */
1978 int
1979 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
1980 {
1981         int ret;
1982         struct sk_buff *nskb = NULL;
1983         int v110_ret = skb->len;
1984         int idx = isdn_dc2minor(drvidx, chan);
1985
1986         if (dev->v110[idx]) {
1987                 atomic_inc(&dev->v110use[idx]);
1988                 nskb = isdn_v110_encode(dev->v110[idx], skb);
1989                 atomic_dec(&dev->v110use[idx]);
1990                 if (!nskb)
1991                         return 0;
1992                 v110_ret = *((int *)nskb->data);
1993                 skb_pull(nskb, sizeof(int));
1994                 if (!nskb->len) {
1995                         dev_kfree_skb(nskb);
1996                         return v110_ret;
1997                 }
1998                 /* V.110 must always be acknowledged */
1999                 ack = 1;
2000                 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2001         } else {
2002                 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2003
2004                 if (skb_headroom(skb) < hl) {
2005                         /*
2006                          * This should only occur when new HL driver with
2007                          * increased hl_hdrlen was loaded after netdevice
2008                          * was created and connected to the new driver.
2009                          *
2010                          * The V.110 branch (re-allocates on its own) does
2011                          * not need this
2012                          */
2013                         struct sk_buff *skb_tmp;
2014
2015                         skb_tmp = skb_realloc_headroom(skb, hl);
2016                         printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2017                         if (!skb_tmp) return -ENOMEM; /* 0 better? */
2018                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2019                         if (ret > 0) {
2020                                 dev_kfree_skb(skb);
2021                         } else {
2022                                 dev_kfree_skb(skb_tmp);
2023                         }
2024                 } else {
2025                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2026                 }
2027         }
2028         if (ret > 0) {
2029                 dev->obytes[idx] += ret;
2030                 if (dev->v110[idx]) {
2031                         atomic_inc(&dev->v110use[idx]);
2032                         dev->v110[idx]->skbuser++;
2033                         atomic_dec(&dev->v110use[idx]);
2034                         /* For V.110 return unencoded data length */
2035                         ret = v110_ret;
2036                         /* if the complete frame was send we free the skb;
2037                            if not upper function will requeue the skb */
2038                         if (ret == skb->len)
2039                                 dev_kfree_skb(skb);
2040                 }
2041         } else
2042                 if (dev->v110[idx])
2043                         dev_kfree_skb(nskb);
2044         return ret;
2045 }
2046
2047 static int
2048 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2049 {
2050         int j, k, m;
2051
2052         init_waitqueue_head(&d->st_waitq);
2053         if (d->flags & DRV_FLAG_RUNNING)
2054                 return -1;
2055         if (n < 1) return 0;
2056
2057         m = (adding) ? d->channels + n : n;
2058
2059         if (dev->channels + n > ISDN_MAX_CHANNELS) {
2060                 printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2061                        ISDN_MAX_CHANNELS);
2062                 return -1;
2063         }
2064
2065         if ((adding) && (d->rcverr))
2066                 kfree(d->rcverr);
2067         if (!(d->rcverr = kcalloc(m, sizeof(int), GFP_ATOMIC))) {
2068                 printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2069                 return -1;
2070         }
2071
2072         if ((adding) && (d->rcvcount))
2073                 kfree(d->rcvcount);
2074         if (!(d->rcvcount = kcalloc(m, sizeof(int), GFP_ATOMIC))) {
2075                 printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2076                 if (!adding)
2077                         kfree(d->rcverr);
2078                 return -1;
2079         }
2080
2081         if ((adding) && (d->rpqueue)) {
2082                 for (j = 0; j < d->channels; j++)
2083                         skb_queue_purge(&d->rpqueue[j]);
2084                 kfree(d->rpqueue);
2085         }
2086         d->rpqueue = kmalloc_array(m, sizeof(struct sk_buff_head), GFP_ATOMIC);
2087         if (!d->rpqueue) {
2088                 printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2089                 if (!adding) {
2090                         kfree(d->rcvcount);
2091                         kfree(d->rcverr);
2092                 }
2093                 return -1;
2094         }
2095         for (j = 0; j < m; j++) {
2096                 skb_queue_head_init(&d->rpqueue[j]);
2097         }
2098
2099         if ((adding) && (d->rcv_waitq))
2100                 kfree(d->rcv_waitq);
2101         d->rcv_waitq = kmalloc(array3_size(sizeof(wait_queue_head_t), 2, m),
2102                                GFP_ATOMIC);
2103         if (!d->rcv_waitq) {
2104                 printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2105                 if (!adding) {
2106                         kfree(d->rpqueue);
2107                         kfree(d->rcvcount);
2108                         kfree(d->rcverr);
2109                 }
2110                 return -1;
2111         }
2112         d->snd_waitq = d->rcv_waitq + m;
2113         for (j = 0; j < m; j++) {
2114                 init_waitqueue_head(&d->rcv_waitq[j]);
2115                 init_waitqueue_head(&d->snd_waitq[j]);
2116         }
2117
2118         dev->channels += n;
2119         for (j = d->channels; j < m; j++)
2120                 for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2121                         if (dev->chanmap[k] < 0) {
2122                                 dev->chanmap[k] = j;
2123                                 dev->drvmap[k] = drvidx;
2124                                 break;
2125                         }
2126         d->channels = m;
2127         return 0;
2128 }
2129
2130 /*
2131  * Low-level-driver registration
2132  */
2133
2134 static void
2135 set_global_features(void)
2136 {
2137         int drvidx;
2138
2139         dev->global_features = 0;
2140         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2141                 if (!dev->drv[drvidx])
2142                         continue;
2143                 if (dev->drv[drvidx]->interface)
2144                         dev->global_features |= dev->drv[drvidx]->interface->features;
2145         }
2146 }
2147
2148 #ifdef CONFIG_ISDN_DIVERSION
2149
2150 static char *map_drvname(int di)
2151 {
2152         if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2153                 return (NULL);
2154         return (dev->drvid[di]); /* driver name */
2155 } /* map_drvname */
2156
2157 static int map_namedrv(char *id)
2158 {  int i;
2159
2160         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2161         { if (!strcmp(dev->drvid[i], id))
2162                         return (i);
2163         }
2164         return (-1);
2165 } /* map_namedrv */
2166
2167 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2168 {
2169         if (i_div->if_magic != DIVERT_IF_MAGIC)
2170                 return (DIVERT_VER_ERR);
2171         switch (i_div->cmd)
2172         {
2173         case DIVERT_CMD_REL:
2174                 if (divert_if != i_div)
2175                         return (DIVERT_REL_ERR);
2176                 divert_if = NULL; /* free interface */
2177                 return (DIVERT_NO_ERR);
2178
2179         case DIVERT_CMD_REG:
2180                 if (divert_if)
2181                         return (DIVERT_REG_ERR);
2182                 i_div->ll_cmd = isdn_command; /* set command function */
2183                 i_div->drv_to_name = map_drvname;
2184                 i_div->name_to_drv = map_namedrv;
2185                 divert_if = i_div; /* remember interface */
2186                 return (DIVERT_NO_ERR);
2187
2188         default:
2189                 return (DIVERT_CMD_ERR);
2190         }
2191 } /* DIVERT_REG_NAME */
2192
2193 EXPORT_SYMBOL(DIVERT_REG_NAME);
2194
2195 #endif /* CONFIG_ISDN_DIVERSION */
2196
2197
2198 EXPORT_SYMBOL(register_isdn);
2199 #ifdef CONFIG_ISDN_PPP
2200 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2201 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2202 #endif
2203
2204 int
2205 register_isdn(isdn_if *i)
2206 {
2207         isdn_driver_t *d;
2208         int j;
2209         ulong flags;
2210         int drvidx;
2211
2212         if (dev->drivers >= ISDN_MAX_DRIVERS) {
2213                 printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2214                        ISDN_MAX_DRIVERS);
2215                 return 0;
2216         }
2217         if (!i->writebuf_skb) {
2218                 printk(KERN_WARNING "register_isdn: No write routine given.\n");
2219                 return 0;
2220         }
2221         if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2222                 printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2223                 return 0;
2224         }
2225
2226         d->maxbufsize = i->maxbufsize;
2227         d->pktcount = 0;
2228         d->stavail = 0;
2229         d->flags = DRV_FLAG_LOADED;
2230         d->online = 0;
2231         d->interface = i;
2232         d->channels = 0;
2233         spin_lock_irqsave(&dev->lock, flags);
2234         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2235                 if (!dev->drv[drvidx])
2236                         break;
2237         if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2238                 spin_unlock_irqrestore(&dev->lock, flags);
2239                 kfree(d);
2240                 return 0;
2241         }
2242         i->channels = drvidx;
2243         i->rcvcallb_skb = isdn_receive_skb_callback;
2244         i->statcallb = isdn_status_callback;
2245         if (!strlen(i->id))
2246                 sprintf(i->id, "line%d", drvidx);
2247         for (j = 0; j < drvidx; j++)
2248                 if (!strcmp(i->id, dev->drvid[j]))
2249                         sprintf(i->id, "line%d", drvidx);
2250         dev->drv[drvidx] = d;
2251         strcpy(dev->drvid[drvidx], i->id);
2252         isdn_info_update();
2253         dev->drivers++;
2254         set_global_features();
2255         spin_unlock_irqrestore(&dev->lock, flags);
2256         return 1;
2257 }
2258
2259 /*
2260 *****************************************************************************
2261 * And now the modules code.
2262 *****************************************************************************
2263 */
2264
2265 static char *
2266 isdn_getrev(const char *revision)
2267 {
2268         char *rev;
2269         char *p;
2270
2271         if ((p = strchr(revision, ':'))) {
2272                 rev = p + 2;
2273                 p = strchr(rev, '$');
2274                 *--p = 0;
2275         } else
2276                 rev = "???";
2277         return rev;
2278 }
2279
2280 /*
2281  * Allocate and initialize all data, register modem-devices
2282  */
2283 static int __init isdn_init(void)
2284 {
2285         int i;
2286         char tmprev[50];
2287
2288         dev = vzalloc(sizeof(isdn_dev));
2289         if (!dev) {
2290                 printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2291                 return -EIO;
2292         }
2293         timer_setup(&dev->timer, isdn_timer_funct, 0);
2294         spin_lock_init(&dev->lock);
2295         spin_lock_init(&dev->timerlock);
2296 #ifdef MODULE
2297         dev->owner = THIS_MODULE;
2298 #endif
2299         mutex_init(&dev->mtx);
2300         init_waitqueue_head(&dev->info_waitq);
2301         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2302                 dev->drvmap[i] = -1;
2303                 dev->chanmap[i] = -1;
2304                 dev->m_idx[i] = -1;
2305                 strcpy(dev->num[i], "???");
2306         }
2307         if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2308                 printk(KERN_WARNING "isdn: Could not register control devices\n");
2309                 vfree(dev);
2310                 return -EIO;
2311         }
2312         if ((isdn_tty_modem_init()) < 0) {
2313                 printk(KERN_WARNING "isdn: Could not register tty devices\n");
2314                 vfree(dev);
2315                 unregister_chrdev(ISDN_MAJOR, "isdn");
2316                 return -EIO;
2317         }
2318 #ifdef CONFIG_ISDN_PPP
2319         if (isdn_ppp_init() < 0) {
2320                 printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2321                 isdn_tty_exit();
2322                 unregister_chrdev(ISDN_MAJOR, "isdn");
2323                 vfree(dev);
2324                 return -EIO;
2325         }
2326 #endif                          /* CONFIG_ISDN_PPP */
2327
2328         strcpy(tmprev, isdn_revision);
2329         printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2330         strcpy(tmprev, isdn_net_revision);
2331         printk("%s/", isdn_getrev(tmprev));
2332         strcpy(tmprev, isdn_ppp_revision);
2333         printk("%s/", isdn_getrev(tmprev));
2334         strcpy(tmprev, isdn_audio_revision);
2335         printk("%s/", isdn_getrev(tmprev));
2336         strcpy(tmprev, isdn_v110_revision);
2337         printk("%s", isdn_getrev(tmprev));
2338
2339 #ifdef MODULE
2340         printk(" loaded\n");
2341 #else
2342         printk("\n");
2343 #endif
2344         isdn_info_update();
2345         return 0;
2346 }
2347
2348 /*
2349  * Unload module
2350  */
2351 static void __exit isdn_exit(void)
2352 {
2353 #ifdef CONFIG_ISDN_PPP
2354         isdn_ppp_cleanup();
2355 #endif
2356         if (isdn_net_rmall() < 0) {
2357                 printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2358                 return;
2359         }
2360         isdn_tty_exit();
2361         unregister_chrdev(ISDN_MAJOR, "isdn");
2362         del_timer_sync(&dev->timer);
2363         /* call vfree with interrupts enabled, else it will hang */
2364         vfree(dev);
2365         printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2366 }
2367
2368 module_init(isdn_init);
2369 module_exit(isdn_exit);