net/irda/ircomm/ircomm_tty.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty.c
   4  * Version:       1.0
   5  * Description:   IrCOMM serial TTY driver
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 21:00:56 1999
   9  * Modified at:   Wed Feb 23 00:09:02 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
  12  *
  13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  28  *
  29  ********************************************************************/
  30
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/fs.h>
  34 #include <linux/slab.h>
  35 #include <linux/sched.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/termios.h>
  38 #include <linux/tty.h>
  39 #include <linux/tty_flip.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <net/irda/irda.h>
  46 #include <net/irda/irmod.h>
  47
  48 #include <net/irda/ircomm_core.h>
  49 #include <net/irda/ircomm_param.h>
  50 #include <net/irda/ircomm_tty_attach.h>
  51 #include <net/irda/ircomm_tty.h>
  52
  53 static int ircomm_tty_install(struct tty_driver *driver,
  54                 struct tty_struct *tty);
  55 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  56 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  57 static int  ircomm_tty_write(struct tty_struct * tty,
  58                              const unsigned char *buf, int count);
  59 static int  ircomm_tty_write_room(struct tty_struct *tty);
  60 static void ircomm_tty_throttle(struct tty_struct *tty);
  61 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  62 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  63 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  64 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  65 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  66 static void ircomm_tty_hangup(struct tty_struct *tty);
  67 static void ircomm_tty_do_softint(struct work_struct *work);
  68 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  69 static void ircomm_tty_stop(struct tty_struct *tty);
  70
  71 static int ircomm_tty_data_indication(void *instance, void *sap,
  72                                       struct sk_buff *skb);
  73 static int ircomm_tty_control_indication(void *instance, void *sap,
  74                                          struct sk_buff *skb);
  75 static void ircomm_tty_flow_indication(void *instance, void *sap,
  76                                        LOCAL_FLOW cmd);
  77 #ifdef CONFIG_PROC_FS
  78 static const struct file_operations ircomm_tty_proc_fops;
  79 #endif /* CONFIG_PROC_FS */
  80 static struct tty_driver *driver;
  81
  82 static hashbin_t *ircomm_tty = NULL;
  83
  84 static const struct tty_operations ops = {
  85         .install         = ircomm_tty_install,
  86         .open            = ircomm_tty_open,
  87         .close           = ircomm_tty_close,
  88         .write           = ircomm_tty_write,
  89         .write_room      = ircomm_tty_write_room,
  90         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  91         .flush_buffer    = ircomm_tty_flush_buffer,
  92         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  93         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  94         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  95         .throttle        = ircomm_tty_throttle,
  96         .unthrottle      = ircomm_tty_unthrottle,
  97         .send_xchar      = ircomm_tty_send_xchar,
  98         .set_termios     = ircomm_tty_set_termios,
  99         .stop            = ircomm_tty_stop,
 100         .start           = ircomm_tty_start,
 101         .hangup          = ircomm_tty_hangup,
 102         .wait_until_sent = ircomm_tty_wait_until_sent,
 103 #ifdef CONFIG_PROC_FS
 104         .proc_fops       = &ircomm_tty_proc_fops,
 105 #endif /* CONFIG_PROC_FS */
 106 };
 107
 108 static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
 109 {
 110         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 111                         port);
 112         /*
 113          * Here, we use to lock those two guys, but as ircomm_param_request()
 114          * does it itself, I don't see the point (and I see the deadlock).
 115          * Jean II
 116          */
 117         if (raise)
 118                 self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
 119         else
 120                 self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
 121
 122         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 123 }
 124
 125 static int ircomm_port_carrier_raised(struct tty_port *port)
 126 {
 127         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 128                         port);
 129         return self->settings.dce & IRCOMM_CD;
 130 }
 131
 132 static const struct tty_port_operations ircomm_port_ops = {
 133         .dtr_rts = ircomm_port_raise_dtr_rts,
 134         .carrier_raised = ircomm_port_carrier_raised,
 135 };
 136
 137 /*
 138  * Function ircomm_tty_init()
 139  *
 140  *    Init IrCOMM TTY layer/driver
 141  *
 142  */
 143 static int __init ircomm_tty_init(void)
 144 {
 145         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 146         if (!driver)
 147                 return -ENOMEM;
 148         ircomm_tty = hashbin_new(HB_LOCK);
 149         if (ircomm_tty == NULL) {
 150                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 151                 put_tty_driver(driver);
 152                 return -ENOMEM;
 153         }
 154
 155         driver->driver_name     = "ircomm";
 156         driver->name            = "ircomm";
 157         driver->major           = IRCOMM_TTY_MAJOR;
 158         driver->minor_start     = IRCOMM_TTY_MINOR;
 159         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 160         driver->subtype         = SERIAL_TYPE_NORMAL;
 161         driver->init_termios    = tty_std_termios;
 162         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 163         driver->flags           = TTY_DRIVER_REAL_RAW;
 164         tty_set_operations(driver, &ops);
 165         if (tty_register_driver(driver)) {
 166                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 167                            __func__);
 168                 put_tty_driver(driver);
 169                 return -1;
 170         }
 171         return 0;
 172 }
 173
 174 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 175 {
 176         IRDA_DEBUG(0, "%s()\n", __func__ );
 177
 178         IRDA_ASSERT(self != NULL, return;);
 179         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 180
 181         ircomm_tty_shutdown(self);
 182
 183         self->magic = 0;
 184         tty_port_destroy(&self->port);
 185         kfree(self);
 186 }
 187
 188 /*
 189  * Function ircomm_tty_cleanup ()
 190  *
 191  *    Remove IrCOMM TTY layer/driver
 192  *
 193  */
 194 static void __exit ircomm_tty_cleanup(void)
 195 {
 196         int ret;
 197
 198         IRDA_DEBUG(4, "%s()\n", __func__ );
 199
 200         ret = tty_unregister_driver(driver);
 201         if (ret) {
 202                 IRDA_ERROR("%s(), failed to unregister driver\n",
 203                            __func__);
 204                 return;
 205         }
 206
 207         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 208         put_tty_driver(driver);
 209 }
 210
 211 /*
 212  * Function ircomm_startup (self)
 213  *
 214  *
 215  *
 216  */
 217 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 218 {
 219         notify_t notify;
 220         int ret = -ENODEV;
 221
 222         IRDA_DEBUG(2, "%s()\n", __func__ );
 223
 224         IRDA_ASSERT(self != NULL, return -1;);
 225         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 226
 227         /* Check if already open */
 228         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
 229                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 230                 return 0;
 231         }
 232
 233         /* Register with IrCOMM */
 234         irda_notify_init(&notify);
 235         /* These callbacks we must handle ourselves */
 236         notify.data_indication       = ircomm_tty_data_indication;
 237         notify.udata_indication      = ircomm_tty_control_indication;
 238         notify.flow_indication       = ircomm_tty_flow_indication;
 239
 240         /* Use the ircomm_tty interface for these ones */
 241         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 242         notify.connect_confirm       = ircomm_tty_connect_confirm;
 243         notify.connect_indication    = ircomm_tty_connect_indication;
 244         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 245         notify.instance = self;
 246
 247         if (!self->ircomm) {
 248                 self->ircomm = ircomm_open(&notify, self->service_type,
 249                                            self->line);
 250         }
 251         if (!self->ircomm)
 252                 goto err;
 253
 254         self->slsap_sel = self->ircomm->slsap_sel;
 255
 256         /* Connect IrCOMM link with remote device */
 257         ret = ircomm_tty_attach_cable(self);
 258         if (ret < 0) {
 259                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 260                 goto err;
 261         }
 262
 263         return 0;
 264 err:
 265         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
 266         return ret;
 267 }
 268
 269 /*
 270  * Function ircomm_block_til_ready (self, filp)
 271  *
 272  *
 273  *
 274  */
 275 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 276                 struct tty_struct *tty, struct file *filp)
 277 {
 278         struct tty_port *port = &self->port;
 279         DECLARE_WAITQUEUE(wait, current);
 280         int             retval;
 281         int             do_clocal = 0;
 282         unsigned long   flags;
 283
 284         IRDA_DEBUG(2, "%s()\n", __func__ );
 285
 286         /*
 287          * If non-blocking mode is set, or the port is not enabled,
 288          * then make the check up front and then exit.
 289          */
 290         if (test_bit(TTY_IO_ERROR, &tty->flags)) {
 291                 port->flags |= ASYNC_NORMAL_ACTIVE;
 292                 return 0;
 293         }
 294
 295         if (filp->f_flags & O_NONBLOCK) {
 296                 /* nonblock mode is set */
 297                 if (tty->termios.c_cflag & CBAUD)
 298                         tty_port_raise_dtr_rts(port);
 299                 port->flags |= ASYNC_NORMAL_ACTIVE;
 300                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 301                 return 0;
 302         }
 303
 304         if (tty->termios.c_cflag & CLOCAL) {
 305                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 306                 do_clocal = 1;
 307         }
 308
 309         /* Wait for carrier detect and the line to become
 310          * free (i.e., not in use by the callout).  While we are in
 311          * this loop, port->count is dropped by one, so that
 312          * mgsl_close() knows when to free things.  We restore it upon
 313          * exit, either normal or abnormal.
 314          */
 315
 316         retval = 0;
 317         add_wait_queue(&port->open_wait, &wait);
 318
 319         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 320               __FILE__, __LINE__, tty->driver->name, port->count);
 321
 322         spin_lock_irqsave(&port->lock, flags);
 323         port->count--;
 324         port->blocked_open++;
 325         spin_unlock_irqrestore(&port->lock, flags);
 326
 327         while (1) {
 328                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
 329                         tty_port_raise_dtr_rts(port);
 330
 331                 set_current_state(TASK_INTERRUPTIBLE);
 332
 333                 if (tty_hung_up_p(filp) ||
 334                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 335                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
 336                                         -EAGAIN : -ERESTARTSYS;
 337                         break;
 338                 }
 339
 340                 /*
 341                  * Check if link is ready now. Even if CLOCAL is
 342                  * specified, we cannot return before the IrCOMM link is
 343                  * ready
 344                  */
 345                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
 346                     (do_clocal || tty_port_carrier_raised(port)) &&
 347                     self->state == IRCOMM_TTY_READY)
 348                 {
 349                         break;
 350                 }
 351
 352                 if (signal_pending(current)) {
 353                         retval = -ERESTARTSYS;
 354                         break;
 355                 }
 356
 357                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 358                       __FILE__, __LINE__, tty->driver->name, port->count);
 359
 360                 schedule();
 361         }
 362
 363         __set_current_state(TASK_RUNNING);
 364         remove_wait_queue(&port->open_wait, &wait);
 365
 366         spin_lock_irqsave(&port->lock, flags);
 367         if (!tty_hung_up_p(filp))
 368                 port->count++;
 369         port->blocked_open--;
 370         spin_unlock_irqrestore(&port->lock, flags);
 371
 372         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 373               __FILE__, __LINE__, tty->driver->name, port->count);
 374
 375         if (!retval)
 376                 port->flags |= ASYNC_NORMAL_ACTIVE;
 377
 378         return retval;
 379 }
 380
 381
 382 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 383 {
 384         struct ircomm_tty_cb *self;
 385         unsigned int line = tty->index;
 386
 387         /* Check if instance already exists */
 388         self = hashbin_lock_find(ircomm_tty, line, NULL);
 389         if (!self) {
 390                 /* No, so make new instance */
 391                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 392                 if (self == NULL) {
 393                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 394                         return -ENOMEM;
 395                 }
 396
 397                 tty_port_init(&self->port);
 398                 self->port.ops = &ircomm_port_ops;
 399                 self->magic = IRCOMM_TTY_MAGIC;
 400                 self->flow = FLOW_STOP;
 401
 402                 self->line = line;
 403                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 404                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 405                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 406
 407                 /* Init some important stuff */
 408                 init_timer(&self->watchdog_timer);
 409                 spin_lock_init(&self->spinlock);
 410
 411                 /*
 412                  * Force TTY into raw mode by default which is usually what
 413                  * we want for IrCOMM and IrLPT. This way applications will
 414                  * not have to twiddle with printcap etc.
 415                  *
 416                  * Note this is completely usafe and doesn't work properly
 417                  */
 418                 tty->termios.c_iflag = 0;
 419                 tty->termios.c_oflag = 0;
 420
 421                 /* Insert into hash */
 422                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 423         }
 424
 425         tty->driver_data = self;
 426
 427         return tty_port_install(&self->port, driver, tty);
 428 }
 429
 430 /*
 431  * Function ircomm_tty_open (tty, filp)
 432  *
 433  *    This routine is called when a particular tty device is opened. This
 434  *    routine is mandatory; if this routine is not filled in, the attempted
 435  *    open will fail with ENODEV.
 436  */
 437 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 438 {
 439         struct ircomm_tty_cb *self = tty->driver_data;
 440         unsigned long   flags;
 441         int ret;
 442
 443         IRDA_DEBUG(2, "%s()\n", __func__ );
 444
 445         /* ++ is not atomic, so this should be protected - Jean II */
 446         spin_lock_irqsave(&self->port.lock, flags);
 447         self->port.count++;
 448         spin_unlock_irqrestore(&self->port.lock, flags);
 449         tty_port_tty_set(&self->port, tty);
 450
 451         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 452                    self->line, self->port.count);
 453
 454         /* Not really used by us, but lets do it anyway */
 455         self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 456
 457         /*
 458          * If the port is the middle of closing, bail out now
 459          */
 460         if (test_bit(ASYNCB_CLOSING, &self->port.flags)) {
 461
 462                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 463                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 464                  * IMHO it's either not needed in the first place
 465                  * or for some reason we need to make sure the async
 466                  * closing has been finished - if so, wouldn't we
 467                  * probably better sleep uninterruptible?
 468                  */
 469
 470                 if (wait_event_interruptible(self->port.close_wait,
 471                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
 472                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 473                                      __func__);
 474                         return -ERESTARTSYS;
 475                 }
 476
 477 #ifdef SERIAL_DO_RESTART
 478                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
 479                         -EAGAIN : -ERESTARTSYS;
 480 #else
 481                 return -EAGAIN;
 482 #endif
 483         }
 484
 485         /* Check if this is a "normal" ircomm device, or an irlpt device */
 486         if (self->line < 0x10) {
 487                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 488                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 489                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 490                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 491                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 492         } else {
 493                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 494                 self->service_type = IRCOMM_3_WIRE_RAW;
 495                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 496         }
 497
 498         ret = ircomm_tty_startup(self);
 499         if (ret)
 500                 return ret;
 501
 502         ret = ircomm_tty_block_til_ready(self, tty, filp);
 503         if (ret) {
 504                 IRDA_DEBUG(2,
 505                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 506                       ret);
 507
 508                 return ret;
 509         }
 510         return 0;
 511 }
 512
 513 /*
 514  * Function ircomm_tty_close (tty, filp)
 515  *
 516  *    This routine is called when a particular tty device is closed.
 517  *
 518  */
 519 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 520 {
 521         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 522         struct tty_port *port = &self->port;
 523
 524         IRDA_DEBUG(0, "%s()\n", __func__ );
 525
 526         IRDA_ASSERT(self != NULL, return;);
 527         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 528
 529         if (tty_port_close_start(port, tty, filp) == 0)
 530                 return;
 531
 532         ircomm_tty_shutdown(self);
 533
 534         tty_driver_flush_buffer(tty);
 535
 536         tty_port_close_end(port, tty);
 537         tty_port_tty_set(port, NULL);
 538 }
 539
 540 /*
 541  * Function ircomm_tty_flush_buffer (tty)
 542  *
 543  *
 544  *
 545  */
 546 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 547 {
 548         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 549
 550         IRDA_ASSERT(self != NULL, return;);
 551         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 552
 553         /*
 554          * Let do_softint() do this to avoid race condition with
 555          * do_softint() ;-)
 556          */
 557         schedule_work(&self->tqueue);
 558 }
 559
 560 /*
 561  * Function ircomm_tty_do_softint (work)
 562  *
 563  *    We use this routine to give the write wakeup to the user at at a
 564  *    safe time (as fast as possible after write have completed). This
 565  *    can be compared to the Tx interrupt.
 566  */
 567 static void ircomm_tty_do_softint(struct work_struct *work)
 568 {
 569         struct ircomm_tty_cb *self =
 570                 container_of(work, struct ircomm_tty_cb, tqueue);
 571         struct tty_struct *tty;
 572         unsigned long flags;
 573         struct sk_buff *skb, *ctrl_skb;
 574
 575         IRDA_DEBUG(2, "%s()\n", __func__ );
 576
 577         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 578                 return;
 579
 580         tty = tty_port_tty_get(&self->port);
 581         if (!tty)
 582                 return;
 583
 584         /* Unlink control buffer */
 585         spin_lock_irqsave(&self->spinlock, flags);
 586
 587         ctrl_skb = self->ctrl_skb;
 588         self->ctrl_skb = NULL;
 589
 590         spin_unlock_irqrestore(&self->spinlock, flags);
 591
 592         /* Flush control buffer if any */
 593         if(ctrl_skb) {
 594                 if(self->flow == FLOW_START)
 595                         ircomm_control_request(self->ircomm, ctrl_skb);
 596                 /* Drop reference count - see ircomm_ttp_data_request(). */
 597                 dev_kfree_skb(ctrl_skb);
 598         }
 599
 600         if (tty->hw_stopped)
 601                 goto put;
 602
 603         /* Unlink transmit buffer */
 604         spin_lock_irqsave(&self->spinlock, flags);
 605
 606         skb = self->tx_skb;
 607         self->tx_skb = NULL;
 608
 609         spin_unlock_irqrestore(&self->spinlock, flags);
 610
 611         /* Flush transmit buffer if any */
 612         if (skb) {
 613                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 614                 /* Drop reference count - see ircomm_ttp_data_request(). */
 615                 dev_kfree_skb(skb);
 616         }
 617
 618         /* Check if user (still) wants to be waken up */
 619         tty_wakeup(tty);
 620 put:
 621         tty_kref_put(tty);
 622 }
 623
 624 /*
 625  * Function ircomm_tty_write (tty, buf, count)
 626  *
 627  *    This routine is called by the kernel to write a series of characters
 628  *    to the tty device. The characters may come from user space or kernel
 629  *    space. This routine will return the number of characters actually
 630  *    accepted for writing. This routine is mandatory.
 631  */
 632 static int ircomm_tty_write(struct tty_struct *tty,
 633                             const unsigned char *buf, int count)
 634 {
 635         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 636         unsigned long flags;
 637         struct sk_buff *skb;
 638         int tailroom = 0;
 639         int len = 0;
 640         int size;
 641
 642         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 643                    tty->hw_stopped);
 644
 645         IRDA_ASSERT(self != NULL, return -1;);
 646         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 647
 648         /* We may receive packets from the TTY even before we have finished
 649          * our setup. Not cool.
 650          * The problem is that we don't know the final header and data size
 651          * to create the proper skb, so any skb we would create would have
 652          * bogus header and data size, so need care.
 653          * We use a bogus header size to safely detect this condition.
 654          * Another problem is that hw_stopped was set to 0 way before it
 655          * should be, so we would drop this skb. It should now be fixed.
 656          * One option is to not accept data until we are properly setup.
 657          * But, I suspect that when it happens, the ppp line discipline
 658          * just "drops" the data, which might screw up connect scripts.
 659          * The second option is to create a "safe skb", with large header
 660          * and small size (see ircomm_tty_open() for values).
 661          * We just need to make sure that when the real values get filled,
 662          * we don't mess up the original "safe skb" (see tx_data_size).
 663          * Jean II */
 664         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 665                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 666 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 667                 /* We didn't consume anything, TTY will retry */
 668                 return 0;
 669 #endif
 670         }
 671
 672         if (count < 1)
 673                 return 0;
 674
 675         /* Protect our manipulation of self->tx_skb and related */
 676         spin_lock_irqsave(&self->spinlock, flags);
 677
 678         /* Fetch current transmit buffer */
 679         skb = self->tx_skb;
 680
 681         /*
 682          * Send out all the data we get, possibly as multiple fragmented
 683          * frames, but this will only happen if the data is larger than the
 684          * max data size. The normal case however is just the opposite, and
 685          * this function may be called multiple times, and will then actually
 686          * defragment the data and send it out as one packet as soon as
 687          * possible, but at a safer point in time
 688          */
 689         while (count) {
 690                 size = count;
 691
 692                 /* Adjust data size to the max data size */
 693                 if (size > self->max_data_size)
 694                         size = self->max_data_size;
 695
 696                 /*
 697                  * Do we already have a buffer ready for transmit, or do
 698                  * we need to allocate a new frame
 699                  */
 700                 if (skb) {
 701                         /*
 702                          * Any room for more data at the end of the current
 703                          * transmit buffer? Cannot use skb_tailroom, since
 704                          * dev_alloc_skb gives us a larger skb than we
 705                          * requested
 706                          * Note : use tx_data_size, because max_data_size
 707                          * may have changed and we don't want to overwrite
 708                          * the skb. - Jean II
 709                          */
 710                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 711                                 /* Adjust data to tailroom */
 712                                 if (size > tailroom)
 713                                         size = tailroom;
 714                         } else {
 715                                 /*
 716                                  * Current transmit frame is full, so break
 717                                  * out, so we can send it as soon as possible
 718                                  */
 719                                 break;
 720                         }
 721                 } else {
 722                         /* Prepare a full sized frame */
 723                         skb = alloc_skb(self->max_data_size+
 724                                         self->max_header_size,
 725                                         GFP_ATOMIC);
 726                         if (!skb) {
 727                                 spin_unlock_irqrestore(&self->spinlock, flags);
 728                                 return -ENOBUFS;
 729                         }
 730                         skb_reserve(skb, self->max_header_size);
 731                         self->tx_skb = skb;
 732                         /* Remember skb size because max_data_size may
 733                          * change later on - Jean II */
 734                         self->tx_data_size = self->max_data_size;
 735                 }
 736
 737                 /* Copy data */
 738                 memcpy(skb_put(skb,size), buf + len, size);
 739
 740                 count -= size;
 741                 len += size;
 742         }
 743
 744         spin_unlock_irqrestore(&self->spinlock, flags);
 745
 746         /*
 747          * Schedule a new thread which will transmit the frame as soon
 748          * as possible, but at a safe point in time. We do this so the
 749          * "user" can give us data multiple times, as PPP does (because of
 750          * its 256 byte tx buffer). We will then defragment and send out
 751          * all this data as one single packet.
 752          */
 753         schedule_work(&self->tqueue);
 754
 755         return len;
 756 }
 757
 758 /*
 759  * Function ircomm_tty_write_room (tty)
 760  *
 761  *    This routine returns the numbers of characters the tty driver will
 762  *    accept for queuing to be written. This number is subject to change as
 763  *    output buffers get emptied, or if the output flow control is acted.
 764  */
 765 static int ircomm_tty_write_room(struct tty_struct *tty)
 766 {
 767         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 768         unsigned long flags;
 769         int ret;
 770
 771         IRDA_ASSERT(self != NULL, return -1;);
 772         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 773
 774 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 775         /* max_header_size tells us if the channel is initialised or not. */
 776         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 777                 /* Don't bother us yet */
 778                 return 0;
 779 #endif
 780
 781         /* Check if we are allowed to transmit any data.
 782          * hw_stopped is the regular flow control.
 783          * Jean II */
 784         if (tty->hw_stopped)
 785                 ret = 0;
 786         else {
 787                 spin_lock_irqsave(&self->spinlock, flags);
 788                 if (self->tx_skb)
 789                         ret = self->tx_data_size - self->tx_skb->len;
 790                 else
 791                         ret = self->max_data_size;
 792                 spin_unlock_irqrestore(&self->spinlock, flags);
 793         }
 794         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 795
 796         return ret;
 797 }
 798
 799 /*
 800  * Function ircomm_tty_wait_until_sent (tty, timeout)
 801  *
 802  *    This routine waits until the device has written out all of the
 803  *    characters in its transmitter FIFO.
 804  */
 805 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 806 {
 807         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 808         unsigned long orig_jiffies, poll_time;
 809         unsigned long flags;
 810
 811         IRDA_DEBUG(2, "%s()\n", __func__ );
 812
 813         IRDA_ASSERT(self != NULL, return;);
 814         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 815
 816         orig_jiffies = jiffies;
 817
 818         /* Set poll time to 200 ms */
 819         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 820
 821         spin_lock_irqsave(&self->spinlock, flags);
 822         while (self->tx_skb && self->tx_skb->len) {
 823                 spin_unlock_irqrestore(&self->spinlock, flags);
 824                 schedule_timeout_interruptible(poll_time);
 825                 spin_lock_irqsave(&self->spinlock, flags);
 826                 if (signal_pending(current))
 827                         break;
 828                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 829                         break;
 830         }
 831         spin_unlock_irqrestore(&self->spinlock, flags);
 832         current->state = TASK_RUNNING;
 833 }
 834
 835 /*
 836  * Function ircomm_tty_throttle (tty)
 837  *
 838  *    This routine notifies the tty driver that input buffers for the line
 839  *    discipline are close to full, and it should somehow signal that no
 840  *    more characters should be sent to the tty.
 841  */
 842 static void ircomm_tty_throttle(struct tty_struct *tty)
 843 {
 844         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 845
 846         IRDA_DEBUG(2, "%s()\n", __func__ );
 847
 848         IRDA_ASSERT(self != NULL, return;);
 849         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 850
 851         /* Software flow control? */
 852         if (I_IXOFF(tty))
 853                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 854
 855         /* Hardware flow control? */
 856         if (tty->termios.c_cflag & CRTSCTS) {
 857                 self->settings.dte &= ~IRCOMM_RTS;
 858                 self->settings.dte |= IRCOMM_DELTA_RTS;
 859
 860                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 861         }
 862
 863         ircomm_flow_request(self->ircomm, FLOW_STOP);
 864 }
 865
 866 /*
 867  * Function ircomm_tty_unthrottle (tty)
 868  *
 869  *    This routine notifies the tty drivers that it should signals that
 870  *    characters can now be sent to the tty without fear of overrunning the
 871  *    input buffers of the line disciplines.
 872  */
 873 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 874 {
 875         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 876
 877         IRDA_DEBUG(2, "%s()\n", __func__ );
 878
 879         IRDA_ASSERT(self != NULL, return;);
 880         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 881
 882         /* Using software flow control? */
 883         if (I_IXOFF(tty)) {
 884                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 885         }
 886
 887         /* Using hardware flow control? */
 888         if (tty->termios.c_cflag & CRTSCTS) {
 889                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 890
 891                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 892                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 893         }
 894         ircomm_flow_request(self->ircomm, FLOW_START);
 895 }
 896
 897 /*
 898  * Function ircomm_tty_chars_in_buffer (tty)
 899  *
 900  *    Indicates if there are any data in the buffer
 901  *
 902  */
 903 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 904 {
 905         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 906         unsigned long flags;
 907         int len = 0;
 908
 909         IRDA_ASSERT(self != NULL, return -1;);
 910         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 911
 912         spin_lock_irqsave(&self->spinlock, flags);
 913
 914         if (self->tx_skb)
 915                 len = self->tx_skb->len;
 916
 917         spin_unlock_irqrestore(&self->spinlock, flags);
 918
 919         return len;
 920 }
 921
 922 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 923 {
 924         unsigned long flags;
 925
 926         IRDA_ASSERT(self != NULL, return;);
 927         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 928
 929         IRDA_DEBUG(0, "%s()\n", __func__ );
 930
 931         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
 932                 return;
 933
 934         ircomm_tty_detach_cable(self);
 935
 936         spin_lock_irqsave(&self->spinlock, flags);
 937
 938         del_timer(&self->watchdog_timer);
 939
 940         /* Free parameter buffer */
 941         if (self->ctrl_skb) {
 942                 dev_kfree_skb(self->ctrl_skb);
 943                 self->ctrl_skb = NULL;
 944         }
 945
 946         /* Free transmit buffer */
 947         if (self->tx_skb) {
 948                 dev_kfree_skb(self->tx_skb);
 949                 self->tx_skb = NULL;
 950         }
 951
 952         if (self->ircomm) {
 953                 ircomm_close(self->ircomm);
 954                 self->ircomm = NULL;
 955         }
 956
 957         spin_unlock_irqrestore(&self->spinlock, flags);
 958 }
 959
 960 /*
 961  * Function ircomm_tty_hangup (tty)
 962  *
 963  *    This routine notifies the tty driver that it should hangup the tty
 964  *    device.
 965  *
 966  */
 967 static void ircomm_tty_hangup(struct tty_struct *tty)
 968 {
 969         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 970         struct tty_port *port = &self->port;
 971         unsigned long   flags;
 972
 973         IRDA_DEBUG(0, "%s()\n", __func__ );
 974
 975         IRDA_ASSERT(self != NULL, return;);
 976         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 977
 978         /* ircomm_tty_flush_buffer(tty); */
 979         ircomm_tty_shutdown(self);
 980
 981         spin_lock_irqsave(&port->lock, flags);
 982         port->flags &= ~ASYNC_NORMAL_ACTIVE;
 983         if (port->tty) {
 984                 set_bit(TTY_IO_ERROR, &port->tty->flags);
 985                 tty_kref_put(port->tty);
 986         }
 987         port->tty = NULL;
 988         port->count = 0;
 989         spin_unlock_irqrestore(&port->lock, flags);
 990
 991         wake_up_interruptible(&port->open_wait);
 992 }
 993
 994 /*
 995  * Function ircomm_tty_send_xchar (tty, ch)
 996  *
 997  *    This routine is used to send a high-priority XON/XOFF character to
 998  *    the device.
 999  */
1000 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1001 {
1002         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1003 }
1004
1005 /*
1006  * Function ircomm_tty_start (tty)
1007  *
1008  *    This routine notifies the tty driver that it resume sending
1009  *    characters to the tty device.
1010  */
1011 void ircomm_tty_start(struct tty_struct *tty)
1012 {
1013         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1014
1015         ircomm_flow_request(self->ircomm, FLOW_START);
1016 }
1017
1018 /*
1019  * Function ircomm_tty_stop (tty)
1020  *
1021  *     This routine notifies the tty driver that it should stop outputting
1022  *     characters to the tty device.
1023  */
1024 static void ircomm_tty_stop(struct tty_struct *tty)
1025 {
1026         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1027
1028         IRDA_ASSERT(self != NULL, return;);
1029         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1030
1031         ircomm_flow_request(self->ircomm, FLOW_STOP);
1032 }
1033
1034 /*
1035  * Function ircomm_check_modem_status (self)
1036  *
1037  *    Check for any changes in the DCE's line settings. This function should
1038  *    be called whenever the dce parameter settings changes, to update the
1039  *    flow control settings and other things
1040  */
1041 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1042 {
1043         struct tty_struct *tty;
1044         int status;
1045
1046         IRDA_DEBUG(0, "%s()\n", __func__ );
1047
1048         IRDA_ASSERT(self != NULL, return;);
1049         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1050
1051         tty = tty_port_tty_get(&self->port);
1052
1053         status = self->settings.dce;
1054
1055         if (status & IRCOMM_DCE_DELTA_ANY) {
1056                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1057         }
1058         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1059                 IRDA_DEBUG(2,
1060                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1061                            (status & IRCOMM_CD) ? "on" : "off");
1062
1063                 if (status & IRCOMM_CD) {
1064                         wake_up_interruptible(&self->port.open_wait);
1065                 } else {
1066                         IRDA_DEBUG(2,
1067                                    "%s(), Doing serial hangup..\n", __func__ );
1068                         if (tty)
1069                                 tty_hangup(tty);
1070
1071                         /* Hangup will remote the tty, so better break out */
1072                         goto put;
1073                 }
1074         }
1075         if (tty && tty_port_cts_enabled(&self->port)) {
1076                 if (tty->hw_stopped) {
1077                         if (status & IRCOMM_CTS) {
1078                                 IRDA_DEBUG(2,
1079                                            "%s(), CTS tx start...\n", __func__ );
1080                                 tty->hw_stopped = 0;
1081
1082                                 /* Wake up processes blocked on open */
1083                                 wake_up_interruptible(&self->port.open_wait);
1084
1085                                 schedule_work(&self->tqueue);
1086                                 goto put;
1087                         }
1088                 } else {
1089                         if (!(status & IRCOMM_CTS)) {
1090                                 IRDA_DEBUG(2,
1091                                            "%s(), CTS tx stop...\n", __func__ );
1092                                 tty->hw_stopped = 1;
1093                         }
1094                 }
1095         }
1096 put:
1097         tty_kref_put(tty);
1098 }
1099
1100 /*
1101  * Function ircomm_tty_data_indication (instance, sap, skb)
1102  *
1103  *    Handle incoming data, and deliver it to the line discipline
1104  *
1105  */
1106 static int ircomm_tty_data_indication(void *instance, void *sap,
1107                                       struct sk_buff *skb)
1108 {
1109         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1110         struct tty_struct *tty;
1111
1112         IRDA_DEBUG(2, "%s()\n", __func__ );
1113
1114         IRDA_ASSERT(self != NULL, return -1;);
1115         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1116         IRDA_ASSERT(skb != NULL, return -1;);
1117
1118         tty = tty_port_tty_get(&self->port);
1119         if (!tty) {
1120                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1121                 return 0;
1122         }
1123
1124         /*
1125          * If we receive data when hardware is stopped then something is wrong.
1126          * We try to poll the peers line settings to check if we are up todate.
1127          * Devices like WinCE can do this, and since they don't send any
1128          * params, we can just as well declare the hardware for running.
1129          */
1130         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1131                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1132                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1133
1134                 /* We can just as well declare the hardware for running */
1135                 ircomm_tty_send_initial_parameters(self);
1136                 ircomm_tty_link_established(self);
1137         }
1138         tty_kref_put(tty);
1139
1140         /*
1141          * Use flip buffer functions since the code may be called from interrupt
1142          * context
1143          */
1144         tty_insert_flip_string(&self->port, skb->data, skb->len);
1145         tty_flip_buffer_push(&self->port);
1146
1147         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1148
1149         return 0;
1150 }
1151
1152 /*
1153  * Function ircomm_tty_control_indication (instance, sap, skb)
1154  *
1155  *    Parse all incoming parameters (easy!)
1156  *
1157  */
1158 static int ircomm_tty_control_indication(void *instance, void *sap,
1159                                          struct sk_buff *skb)
1160 {
1161         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1162         int clen;
1163
1164         IRDA_DEBUG(4, "%s()\n", __func__ );
1165
1166         IRDA_ASSERT(self != NULL, return -1;);
1167         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1168         IRDA_ASSERT(skb != NULL, return -1;);
1169
1170         clen = skb->data[0];
1171
1172         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1173                                &ircomm_param_info);
1174
1175         /* No need to kfree_skb - see ircomm_control_indication() */
1176
1177         return 0;
1178 }
1179
1180 /*
1181  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1182  *
1183  *    This function is called by IrTTP when it wants us to slow down the
1184  *    transmission of data. We just mark the hardware as stopped, and wait
1185  *    for IrTTP to notify us that things are OK again.
1186  */
1187 static void ircomm_tty_flow_indication(void *instance, void *sap,
1188                                        LOCAL_FLOW cmd)
1189 {
1190         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1191         struct tty_struct *tty;
1192
1193         IRDA_ASSERT(self != NULL, return;);
1194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1195
1196         tty = tty_port_tty_get(&self->port);
1197
1198         switch (cmd) {
1199         case FLOW_START:
1200                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1201                 if (tty)
1202                         tty->hw_stopped = 0;
1203
1204                 /* ircomm_tty_do_softint will take care of the rest */
1205                 schedule_work(&self->tqueue);
1206                 break;
1207         default:  /* If we get here, something is very wrong, better stop */
1208         case FLOW_STOP:
1209                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1210                 if (tty)
1211                         tty->hw_stopped = 1;
1212                 break;
1213         }
1214
1215         tty_kref_put(tty);
1216         self->flow = cmd;
1217 }
1218
1219 #ifdef CONFIG_PROC_FS
1220 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1221 {
1222         struct tty_struct *tty;
1223         char sep;
1224
1225         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1226
1227         seq_puts(m, "Service type: ");
1228         if (self->service_type & IRCOMM_9_WIRE)
1229                 seq_puts(m, "9_WIRE");
1230         else if (self->service_type & IRCOMM_3_WIRE)
1231                 seq_puts(m, "3_WIRE");
1232         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1233                 seq_puts(m, "3_WIRE_RAW");
1234         else
1235                 seq_puts(m, "No common service type!\n");
1236         seq_putc(m, '\n');
1237
1238         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1239
1240         seq_printf(m, "DTE status:");
1241         sep = ' ';
1242         if (self->settings.dte & IRCOMM_RTS) {
1243                 seq_printf(m, "%cRTS", sep);
1244                 sep = '|';
1245         }
1246         if (self->settings.dte & IRCOMM_DTR) {
1247                 seq_printf(m, "%cDTR", sep);
1248                 sep = '|';
1249         }
1250         seq_putc(m, '\n');
1251
1252         seq_puts(m, "DCE status:");
1253         sep = ' ';
1254         if (self->settings.dce & IRCOMM_CTS) {
1255                 seq_printf(m, "%cCTS", sep);
1256                 sep = '|';
1257         }
1258         if (self->settings.dce & IRCOMM_DSR) {
1259                 seq_printf(m, "%cDSR", sep);
1260                 sep = '|';
1261         }
1262         if (self->settings.dce & IRCOMM_CD) {
1263                 seq_printf(m, "%cCD", sep);
1264                 sep = '|';
1265         }
1266         if (self->settings.dce & IRCOMM_RI) {
1267                 seq_printf(m, "%cRI", sep);
1268                 sep = '|';
1269         }
1270         seq_putc(m, '\n');
1271
1272         seq_puts(m, "Configuration: ");
1273         if (!self->settings.null_modem)
1274                 seq_puts(m, "DTE <-> DCE\n");
1275         else
1276                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1277
1278         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1279
1280         seq_puts(m, "Flow control:");
1281         sep = ' ';
1282         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1283                 seq_printf(m, "%cXON_XOFF_IN", sep);
1284                 sep = '|';
1285         }
1286         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1287                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1288                 sep = '|';
1289         }
1290         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1291                 seq_printf(m, "%cRTS_CTS_IN", sep);
1292                 sep = '|';
1293         }
1294         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1295                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1296                 sep = '|';
1297         }
1298         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1299                 seq_printf(m, "%cDSR_DTR_IN", sep);
1300                 sep = '|';
1301         }
1302         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1303                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1307                 seq_printf(m, "%cENQ_ACK_IN", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1311                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1312                 sep = '|';
1313         }
1314         seq_putc(m, '\n');
1315
1316         seq_puts(m, "Flags:");
1317         sep = ' ';
1318         if (tty_port_cts_enabled(&self->port)) {
1319                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1320                 sep = '|';
1321         }
1322         if (self->port.flags & ASYNC_CHECK_CD) {
1323                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1324                 sep = '|';
1325         }
1326         if (self->port.flags & ASYNC_INITIALIZED) {
1327                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1328                 sep = '|';
1329         }
1330         if (self->port.flags & ASYNC_LOW_LATENCY) {
1331                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1332                 sep = '|';
1333         }
1334         if (self->port.flags & ASYNC_CLOSING) {
1335                 seq_printf(m, "%cASYNC_CLOSING", sep);
1336                 sep = '|';
1337         }
1338         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1339                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1340                 sep = '|';
1341         }
1342         seq_putc(m, '\n');
1343
1344         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1345         seq_printf(m, "Open count: %d\n", self->port.count);
1346         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1347         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1348
1349         tty = tty_port_tty_get(&self->port);
1350         if (tty) {
1351                 seq_printf(m, "Hardware: %s\n",
1352                                tty->hw_stopped ? "Stopped" : "Running");
1353                 tty_kref_put(tty);
1354         }
1355 }
1356
1357 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1358 {
1359         struct ircomm_tty_cb *self;
1360         unsigned long flags;
1361
1362         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1363
1364         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1365         while (self != NULL) {
1366                 if (self->magic != IRCOMM_TTY_MAGIC)
1367                         break;
1368
1369                 ircomm_tty_line_info(self, m);
1370                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1371         }
1372         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1373         return 0;
1374 }
1375
1376 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1377 {
1378         return single_open(file, ircomm_tty_proc_show, NULL);
1379 }
1380
1381 static const struct file_operations ircomm_tty_proc_fops = {
1382         .owner          = THIS_MODULE,
1383         .open           = ircomm_tty_proc_open,
1384         .read           = seq_read,
1385         .llseek         = seq_lseek,
1386         .release        = single_release,
1387 };
1388 #endif /* CONFIG_PROC_FS */
1389
1390 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1391 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1392 MODULE_LICENSE("GPL");
1393 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1394
1395 module_init(ircomm_tty_init);
1396 module_exit(ircomm_tty_cleanup);