drivers/isdn/gigaset/interface.c

   1 /*
   2  * interface to user space for the gigaset driver
   3  *
   4  * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
   5  *
   6  * =====================================================================
   7  *    This program is free software; you can redistribute it and/or
   8  *    modify it under the terms of the GNU General Public License as
   9  *    published by the Free Software Foundation; either version 2 of
  10  *    the License, or (at your option) any later version.
  11  * =====================================================================
  12  */
  13
  14 #include "gigaset.h"
  15 #include <linux/gigaset_dev.h>
  16 #include <linux/tty.h>
  17 #include <linux/tty_flip.h>
  18
  19 /*** our ioctls ***/
  20
  21 static int if_lock(struct cardstate *cs, int *arg)
  22 {
  23         int cmd = *arg;
  24
  25         gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
  26
  27         if (cmd > 1)
  28                 return -EINVAL;
  29
  30         if (cmd < 0) {
  31                 *arg = cs->mstate == MS_LOCKED;
  32                 return 0;
  33         }
  34
  35         if (!cmd && cs->mstate == MS_LOCKED && cs->connected) {
  36                 cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
  37                 cs->ops->baud_rate(cs, B115200);
  38                 cs->ops->set_line_ctrl(cs, CS8);
  39                 cs->control_state = TIOCM_DTR|TIOCM_RTS;
  40         }
  41
  42         cs->waiting = 1;
  43         if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
  44                                NULL, cmd, NULL)) {
  45                 cs->waiting = 0;
  46                 return -ENOMEM;
  47         }
  48
  49         gig_dbg(DEBUG_CMD, "scheduling IF_LOCK");
  50         gigaset_schedule_event(cs);
  51
  52         wait_event(cs->waitqueue, !cs->waiting);
  53
  54         if (cs->cmd_result >= 0) {
  55                 *arg = cs->cmd_result;
  56                 return 0;
  57         }
  58
  59         return cs->cmd_result;
  60 }
  61
  62 static int if_version(struct cardstate *cs, unsigned arg[4])
  63 {
  64         static const unsigned version[4] = GIG_VERSION;
  65         static const unsigned compat[4] = GIG_COMPAT;
  66         unsigned cmd = arg[0];
  67
  68         gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
  69
  70         switch (cmd) {
  71         case GIGVER_DRIVER:
  72                 memcpy(arg, version, sizeof version);
  73                 return 0;
  74         case GIGVER_COMPAT:
  75                 memcpy(arg, compat, sizeof compat);
  76                 return 0;
  77         case GIGVER_FWBASE:
  78                 cs->waiting = 1;
  79                 if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
  80                                        NULL, 0, arg)) {
  81                         cs->waiting = 0;
  82                         return -ENOMEM;
  83                 }
  84
  85                 gig_dbg(DEBUG_CMD, "scheduling IF_VER");
  86                 gigaset_schedule_event(cs);
  87
  88                 wait_event(cs->waitqueue, !cs->waiting);
  89
  90                 if (cs->cmd_result >= 0)
  91                         return 0;
  92
  93                 return cs->cmd_result;
  94         default:
  95                 return -EINVAL;
  96         }
  97 }
  98
  99 static int if_config(struct cardstate *cs, int *arg)
 100 {
 101         gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
 102
 103         if (*arg != 1)
 104                 return -EINVAL;
 105
 106         if (cs->mstate != MS_LOCKED)
 107                 return -EBUSY;
 108
 109         if (!cs->connected) {
 110                 err("not connected!");
 111                 return -ENODEV;
 112         }
 113
 114         *arg = 0;
 115         return gigaset_enterconfigmode(cs);
 116 }
 117
 118 /*** the terminal driver ***/
 119 /* stolen from usbserial and some other tty drivers */
 120
 121 static int  if_open(struct tty_struct *tty, struct file *filp);
 122 static void if_close(struct tty_struct *tty, struct file *filp);
 123 static int  if_ioctl(struct tty_struct *tty, struct file *file,
 124                      unsigned int cmd, unsigned long arg);
 125 static int  if_write_room(struct tty_struct *tty);
 126 static int  if_chars_in_buffer(struct tty_struct *tty);
 127 static void if_throttle(struct tty_struct *tty);
 128 static void if_unthrottle(struct tty_struct *tty);
 129 static void if_set_termios(struct tty_struct *tty, struct ktermios *old);
 130 static int  if_tiocmget(struct tty_struct *tty, struct file *file);
 131 static int  if_tiocmset(struct tty_struct *tty, struct file *file,
 132                         unsigned int set, unsigned int clear);
 133 static int  if_write(struct tty_struct *tty,
 134                      const unsigned char *buf, int count);
 135
 136 static const struct tty_operations if_ops = {
 137         .open =                 if_open,
 138         .close =                if_close,
 139         .ioctl =                if_ioctl,
 140         .write =                if_write,
 141         .write_room =           if_write_room,
 142         .chars_in_buffer =      if_chars_in_buffer,
 143         .set_termios =          if_set_termios,
 144         .throttle =             if_throttle,
 145         .unthrottle =           if_unthrottle,
 146 #if 0
 147         .break_ctl =            serial_break,
 148 #endif
 149         .tiocmget =             if_tiocmget,
 150         .tiocmset =             if_tiocmset,
 151 };
 152
 153 static int if_open(struct tty_struct *tty, struct file *filp)
 154 {
 155         struct cardstate *cs;
 156         unsigned long flags;
 157
 158         gig_dbg(DEBUG_IF, "%d+%d: %s()",
 159                 tty->driver->minor_start, tty->index, __func__);
 160
 161         tty->driver_data = NULL;
 162
 163         cs = gigaset_get_cs_by_tty(tty);
 164         if (!cs)
 165                 return -ENODEV;
 166
 167         if (mutex_lock_interruptible(&cs->mutex))
 168                 return -ERESTARTSYS; // FIXME -EINTR?
 169         tty->driver_data = cs;
 170
 171         ++cs->open_count;
 172
 173         if (cs->open_count == 1) {
 174                 spin_lock_irqsave(&cs->lock, flags);
 175                 cs->tty = tty;
 176                 spin_unlock_irqrestore(&cs->lock, flags);
 177                 tty->low_latency = 1; //FIXME test
 178         }
 179
 180         mutex_unlock(&cs->mutex);
 181         return 0;
 182 }
 183
 184 static void if_close(struct tty_struct *tty, struct file *filp)
 185 {
 186         struct cardstate *cs;
 187         unsigned long flags;
 188
 189         cs = (struct cardstate *) tty->driver_data;
 190         if (!cs) {
 191                 err("cs==NULL in %s", __func__);
 192                 return;
 193         }
 194
 195         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 196
 197         mutex_lock(&cs->mutex);
 198
 199         if (!cs->open_count)
 200                 warn("%s: device not opened", __func__);
 201         else {
 202                 if (!--cs->open_count) {
 203                         spin_lock_irqsave(&cs->lock, flags);
 204                         cs->tty = NULL;
 205                         spin_unlock_irqrestore(&cs->lock, flags);
 206                 }
 207         }
 208
 209         mutex_unlock(&cs->mutex);
 210 }
 211
 212 static int if_ioctl(struct tty_struct *tty, struct file *file,
 213                     unsigned int cmd, unsigned long arg)
 214 {
 215         struct cardstate *cs;
 216         int retval = -ENODEV;
 217         int int_arg;
 218         unsigned char buf[6];
 219         unsigned version[4];
 220
 221         cs = (struct cardstate *) tty->driver_data;
 222         if (!cs) {
 223                 err("cs==NULL in %s", __func__);
 224                 return -ENODEV;
 225         }
 226
 227         gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
 228
 229         if (mutex_lock_interruptible(&cs->mutex))
 230                 return -ERESTARTSYS; // FIXME -EINTR?
 231
 232         if (!cs->open_count)
 233                 warn("%s: device not opened", __func__);
 234         else {
 235                 retval = 0;
 236                 switch (cmd) {
 237                 case GIGASET_REDIR:
 238                         retval = get_user(int_arg, (int __user *) arg);
 239                         if (retval >= 0)
 240                                 retval = if_lock(cs, &int_arg);
 241                         if (retval >= 0)
 242                                 retval = put_user(int_arg, (int __user *) arg);
 243                         break;
 244                 case GIGASET_CONFIG:
 245                         retval = get_user(int_arg, (int __user *) arg);
 246                         if (retval >= 0)
 247                                 retval = if_config(cs, &int_arg);
 248                         if (retval >= 0)
 249                                 retval = put_user(int_arg, (int __user *) arg);
 250                         break;
 251                 case GIGASET_BRKCHARS:
 252                         //FIXME test if MS_LOCKED
 253                         if (!cs->connected) {
 254                                 gig_dbg(DEBUG_ANY,
 255                                     "can't communicate with unplugged device");
 256                                 retval = -ENODEV;
 257                                 break;
 258                         }
 259                         retval = copy_from_user(&buf,
 260                                         (const unsigned char __user *) arg, 6)
 261                                 ? -EFAULT : 0;
 262                         if (retval >= 0) {
 263                                 gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
 264                                                 6, (const unsigned char *) arg);
 265                                 retval = cs->ops->brkchars(cs, buf);
 266                         }
 267                         break;
 268                 case GIGASET_VERSION:
 269                         retval = copy_from_user(version,
 270                                         (unsigned __user *) arg, sizeof version)
 271                                 ? -EFAULT : 0;
 272                         if (retval >= 0)
 273                                 retval = if_version(cs, version);
 274                         if (retval >= 0)
 275                                 retval = copy_to_user((unsigned __user *) arg,
 276                                                       version, sizeof version)
 277                                         ? -EFAULT : 0;
 278                         break;
 279                 default:
 280                         gig_dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x",
 281                                 __func__, cmd);
 282                         retval = -ENOIOCTLCMD;
 283                 }
 284         }
 285
 286         mutex_unlock(&cs->mutex);
 287
 288         return retval;
 289 }
 290
 291 static int if_tiocmget(struct tty_struct *tty, struct file *file)
 292 {
 293         struct cardstate *cs;
 294         int retval;
 295
 296         cs = (struct cardstate *) tty->driver_data;
 297         if (!cs) {
 298                 err("cs==NULL in %s", __func__);
 299                 return -ENODEV;
 300         }
 301
 302         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 303
 304         if (mutex_lock_interruptible(&cs->mutex))
 305                 return -ERESTARTSYS; // FIXME -EINTR?
 306
 307         // FIXME read from device?
 308         retval = cs->control_state & (TIOCM_RTS|TIOCM_DTR);
 309
 310         mutex_unlock(&cs->mutex);
 311
 312         return retval;
 313 }
 314
 315 static int if_tiocmset(struct tty_struct *tty, struct file *file,
 316                        unsigned int set, unsigned int clear)
 317 {
 318         struct cardstate *cs;
 319         int retval;
 320         unsigned mc;
 321
 322         cs = (struct cardstate *) tty->driver_data;
 323         if (!cs) {
 324                 err("cs==NULL in %s", __func__);
 325                 return -ENODEV;
 326         }
 327
 328         gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
 329                 cs->minor_index, __func__, set, clear);
 330
 331         if (mutex_lock_interruptible(&cs->mutex))
 332                 return -ERESTARTSYS; // FIXME -EINTR?
 333
 334         if (!cs->connected) {
 335                 gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
 336                 retval = -ENODEV;
 337         } else {
 338                 mc = (cs->control_state | set) & ~clear & (TIOCM_RTS|TIOCM_DTR);
 339                 retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
 340                 cs->control_state = mc;
 341         }
 342
 343         mutex_unlock(&cs->mutex);
 344
 345         return retval;
 346 }
 347
 348 static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
 349 {
 350         struct cardstate *cs;
 351         int retval = -ENODEV;
 352
 353         cs = (struct cardstate *) tty->driver_data;
 354         if (!cs) {
 355                 err("cs==NULL in %s", __func__);
 356                 return -ENODEV;
 357         }
 358
 359         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 360
 361         if (mutex_lock_interruptible(&cs->mutex))
 362                 return -ERESTARTSYS; // FIXME -EINTR?
 363
 364         if (!cs->open_count)
 365                 warn("%s: device not opened", __func__);
 366         else if (cs->mstate != MS_LOCKED) {
 367                 warn("can't write to unlocked device");
 368                 retval = -EBUSY;
 369         } else if (!cs->connected) {
 370                 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
 371                 retval = -EBUSY; //FIXME
 372         } else {
 373                 retval = cs->ops->write_cmd(cs, buf, count,
 374                                             &cs->if_wake_tasklet);
 375         }
 376
 377         mutex_unlock(&cs->mutex);
 378
 379         return retval;
 380 }
 381
 382 static int if_write_room(struct tty_struct *tty)
 383 {
 384         struct cardstate *cs;
 385         int retval = -ENODEV;
 386
 387         cs = (struct cardstate *) tty->driver_data;
 388         if (!cs) {
 389                 err("cs==NULL in %s", __func__);
 390                 return -ENODEV;
 391         }
 392
 393         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 394
 395         if (mutex_lock_interruptible(&cs->mutex))
 396                 return -ERESTARTSYS; // FIXME -EINTR?
 397
 398         if (!cs->open_count)
 399                 warn("%s: device not opened", __func__);
 400         else if (cs->mstate != MS_LOCKED) {
 401                 warn("can't write to unlocked device");
 402                 retval = -EBUSY;
 403         } else if (!cs->connected) {
 404                 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
 405                 retval = -EBUSY; //FIXME
 406         } else
 407                 retval = cs->ops->write_room(cs);
 408
 409         mutex_unlock(&cs->mutex);
 410
 411         return retval;
 412 }
 413
 414 static int if_chars_in_buffer(struct tty_struct *tty)
 415 {
 416         struct cardstate *cs;
 417         int retval = -ENODEV;
 418
 419         cs = (struct cardstate *) tty->driver_data;
 420         if (!cs) {
 421                 err("cs==NULL in %s", __func__);
 422                 return -ENODEV;
 423         }
 424
 425         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 426
 427         if (mutex_lock_interruptible(&cs->mutex))
 428                 return -ERESTARTSYS; // FIXME -EINTR?
 429
 430         if (!cs->open_count)
 431                 warn("%s: device not opened", __func__);
 432         else if (cs->mstate != MS_LOCKED) {
 433                 warn("can't write to unlocked device");
 434                 retval = -EBUSY;
 435         } else if (!cs->connected) {
 436                 gig_dbg(DEBUG_ANY, "can't write to unplugged device");
 437                 retval = -EBUSY; //FIXME
 438         } else
 439                 retval = cs->ops->chars_in_buffer(cs);
 440
 441         mutex_unlock(&cs->mutex);
 442
 443         return retval;
 444 }
 445
 446 static void if_throttle(struct tty_struct *tty)
 447 {
 448         struct cardstate *cs;
 449
 450         cs = (struct cardstate *) tty->driver_data;
 451         if (!cs) {
 452                 err("cs==NULL in %s", __func__);
 453                 return;
 454         }
 455
 456         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 457
 458         mutex_lock(&cs->mutex);
 459
 460         if (!cs->open_count)
 461                 warn("%s: device not opened", __func__);
 462         else {
 463                 //FIXME
 464         }
 465
 466         mutex_unlock(&cs->mutex);
 467 }
 468
 469 static void if_unthrottle(struct tty_struct *tty)
 470 {
 471         struct cardstate *cs;
 472
 473         cs = (struct cardstate *) tty->driver_data;
 474         if (!cs) {
 475                 err("cs==NULL in %s", __func__);
 476                 return;
 477         }
 478
 479         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 480
 481         mutex_lock(&cs->mutex);
 482
 483         if (!cs->open_count)
 484                 warn("%s: device not opened", __func__);
 485         else {
 486                 //FIXME
 487         }
 488
 489         mutex_unlock(&cs->mutex);
 490 }
 491
 492 static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
 493 {
 494         struct cardstate *cs;
 495         unsigned int iflag;
 496         unsigned int cflag;
 497         unsigned int old_cflag;
 498         unsigned int control_state, new_state;
 499
 500         cs = (struct cardstate *) tty->driver_data;
 501         if (!cs) {
 502                 err("cs==NULL in %s", __func__);
 503                 return;
 504         }
 505
 506         gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
 507
 508         mutex_lock(&cs->mutex);
 509
 510         if (!cs->open_count) {
 511                 warn("%s: device not opened", __func__);
 512                 goto out;
 513         }
 514
 515         if (!cs->connected) {
 516                 gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
 517                 goto out;
 518         }
 519
 520         // stolen from mct_u232.c
 521         iflag = tty->termios->c_iflag;
 522         cflag = tty->termios->c_cflag;
 523         old_cflag = old ? old->c_cflag : cflag; //FIXME?
 524         gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
 525                 cs->minor_index, iflag, cflag, old_cflag);
 526
 527         /* get a local copy of the current port settings */
 528         control_state = cs->control_state;
 529
 530         /*
 531          * Update baud rate.
 532          * Do not attempt to cache old rates and skip settings,
 533          * disconnects screw such tricks up completely.
 534          * Premature optimization is the root of all evil.
 535          */
 536
 537         /* reassert DTR and (maybe) RTS on transition from B0 */
 538         if ((old_cflag & CBAUD) == B0) {
 539                 new_state = control_state | TIOCM_DTR;
 540                 /* don't set RTS if using hardware flow control */
 541                 if (!(old_cflag & CRTSCTS))
 542                         new_state |= TIOCM_RTS;
 543                 gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
 544                         cs->minor_index,
 545                         (new_state & TIOCM_RTS) ? " only" : "/RTS");
 546                 cs->ops->set_modem_ctrl(cs, control_state, new_state);
 547                 control_state = new_state;
 548         }
 549
 550         cs->ops->baud_rate(cs, cflag & CBAUD);
 551
 552         if ((cflag & CBAUD) == B0) {
 553                 /* Drop RTS and DTR */
 554                 gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
 555                 new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
 556                 cs->ops->set_modem_ctrl(cs, control_state, new_state);
 557                 control_state = new_state;
 558         }
 559
 560         /*
 561          * Update line control register (LCR)
 562          */
 563
 564         cs->ops->set_line_ctrl(cs, cflag);
 565
 566 #if 0
 567         //FIXME this hangs M101 [ts 2005-03-09]
 568         //FIXME do we need this?
 569         /*
 570          * Set flow control: well, I do not really now how to handle DTR/RTS.
 571          * Just do what we have seen with SniffUSB on Win98.
 572          */
 573         /* Drop DTR/RTS if no flow control otherwise assert */
 574         gig_dbg(DEBUG_IF, "%u: control_state %x",
 575                 cs->minor_index, control_state);
 576         new_state = control_state;
 577         if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 578                 new_state |= TIOCM_DTR | TIOCM_RTS;
 579         else
 580                 new_state &= ~(TIOCM_DTR | TIOCM_RTS);
 581         if (new_state != control_state) {
 582                 gig_dbg(DEBUG_IF, "%u: new_state %x",
 583                         cs->minor_index, new_state);
 584                 gigaset_set_modem_ctrl(cs, control_state, new_state);
 585                 control_state = new_state;
 586         }
 587 #endif
 588
 589         /* save off the modified port settings */
 590         cs->control_state = control_state;
 591
 592 out:
 593         mutex_unlock(&cs->mutex);
 594 }
 595
 596
 597 /* wakeup tasklet for the write operation */
 598 static void if_wake(unsigned long data)
 599 {
 600         struct cardstate *cs = (struct cardstate *) data;
 601
 602         if (cs->tty)
 603                 tty_wakeup(cs->tty);
 604 }
 605
 606 /*** interface to common ***/
 607
 608 void gigaset_if_init(struct cardstate *cs)
 609 {
 610         struct gigaset_driver *drv;
 611
 612         drv = cs->driver;
 613         if (!drv->have_tty)
 614                 return;
 615
 616         tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs);
 617
 618         mutex_lock(&cs->mutex);
 619         cs->tty_dev = tty_register_device(drv->tty, cs->minor_index, NULL);
 620
 621         if (!IS_ERR(cs->tty_dev))
 622                 dev_set_drvdata(cs->tty_dev, cs);
 623         else {
 624                 warn("could not register device to the tty subsystem");
 625                 cs->tty_dev = NULL;
 626         }
 627         mutex_unlock(&cs->mutex);
 628 }
 629
 630 void gigaset_if_free(struct cardstate *cs)
 631 {
 632         struct gigaset_driver *drv;
 633
 634         drv = cs->driver;
 635         if (!drv->have_tty)
 636                 return;
 637
 638         tasklet_disable(&cs->if_wake_tasklet);
 639         tasklet_kill(&cs->if_wake_tasklet);
 640         cs->tty_dev = NULL;
 641         tty_unregister_device(drv->tty, cs->minor_index);
 642 }
 643
 644 void gigaset_if_receive(struct cardstate *cs,
 645                         unsigned char *buffer, size_t len)
 646 {
 647         unsigned long flags;
 648         struct tty_struct *tty;
 649
 650         spin_lock_irqsave(&cs->lock, flags);
 651         if ((tty = cs->tty) == NULL)
 652                 gig_dbg(DEBUG_ANY, "receive on closed device");
 653         else {
 654                 tty_buffer_request_room(tty, len);
 655                 tty_insert_flip_string(tty, buffer, len);
 656                 tty_flip_buffer_push(tty);
 657         }
 658         spin_unlock_irqrestore(&cs->lock, flags);
 659 }
 660 EXPORT_SYMBOL_GPL(gigaset_if_receive);
 661
 662 /* gigaset_if_initdriver
 663  * Initialize tty interface.
 664  * parameters:
 665  *      drv             Driver
 666  *      procname        Name of the driver (e.g. for /proc/tty/drivers)
 667  *      devname         Name of the device files (prefix without minor number)
 668  */
 669 void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
 670                            const char *devname)
 671 {
 672         unsigned minors = drv->minors;
 673         int ret;
 674         struct tty_driver *tty;
 675
 676         drv->have_tty = 0;
 677
 678         if ((drv->tty = alloc_tty_driver(minors)) == NULL)
 679                 goto enomem;
 680         tty = drv->tty;
 681
 682         tty->magic =            TTY_DRIVER_MAGIC,
 683         tty->major =            GIG_MAJOR,
 684         tty->type =             TTY_DRIVER_TYPE_SERIAL,
 685         tty->subtype =          SERIAL_TYPE_NORMAL,
 686         tty->flags =            TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
 687
 688         tty->driver_name =      procname;
 689         tty->name =             devname;
 690         tty->minor_start =      drv->minor;
 691         tty->num =              drv->minors;
 692
 693         tty->owner =            THIS_MODULE;
 694
 695         tty->init_termios          = tty_std_termios; //FIXME
 696         tty->init_termios.c_cflag  = B9600 | CS8 | CREAD | HUPCL | CLOCAL; //FIXME
 697         tty_set_operations(tty, &if_ops);
 698
 699         ret = tty_register_driver(tty);
 700         if (ret < 0) {
 701                 warn("failed to register tty driver (error %d)", ret);
 702                 goto error;
 703         }
 704         gig_dbg(DEBUG_IF, "tty driver initialized");
 705         drv->have_tty = 1;
 706         return;
 707
 708 enomem:
 709         warn("could not allocate tty structures");
 710 error:
 711         if (drv->tty)
 712                 put_tty_driver(drv->tty);
 713 }
 714
 715 void gigaset_if_freedriver(struct gigaset_driver *drv)
 716 {
 717         if (!drv->have_tty)
 718                 return;
 719
 720         drv->have_tty = 0;
 721         tty_unregister_driver(drv->tty);
 722         put_tty_driver(drv->tty);
 723 }