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         if (!tty_hung_up_p(filp))
 324                 port->count--;
 325         port->blocked_open++;
 326         spin_unlock_irqrestore(&port->lock, flags);
 327
 328         while (1) {
 329                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
 330                         tty_port_raise_dtr_rts(port);
 331
 332                 set_current_state(TASK_INTERRUPTIBLE);
 333
 334                 if (tty_hung_up_p(filp) ||
 335                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 336                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
 337                                         -EAGAIN : -ERESTARTSYS;
 338                         break;
 339                 }
 340
 341                 /*
 342                  * Check if link is ready now. Even if CLOCAL is
 343                  * specified, we cannot return before the IrCOMM link is
 344                  * ready
 345                  */
 346                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
 347                     (do_clocal || tty_port_carrier_raised(port)) &&
 348                     self->state == IRCOMM_TTY_READY)
 349                 {
 350                         break;
 351                 }
 352
 353                 if (signal_pending(current)) {
 354                         retval = -ERESTARTSYS;
 355                         break;
 356                 }
 357
 358                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 359                       __FILE__, __LINE__, tty->driver->name, port->count);
 360
 361                 schedule();
 362         }
 363
 364         __set_current_state(TASK_RUNNING);
 365         remove_wait_queue(&port->open_wait, &wait);
 366
 367         spin_lock_irqsave(&port->lock, flags);
 368         if (!tty_hung_up_p(filp))
 369                 port->count++;
 370         port->blocked_open--;
 371         spin_unlock_irqrestore(&port->lock, flags);
 372
 373         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 374               __FILE__, __LINE__, tty->driver->name, port->count);
 375
 376         if (!retval)
 377                 port->flags |= ASYNC_NORMAL_ACTIVE;
 378
 379         return retval;
 380 }
 381
 382
 383 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 384 {
 385         struct ircomm_tty_cb *self;
 386         unsigned int line = tty->index;
 387
 388         /* Check if instance already exists */
 389         self = hashbin_lock_find(ircomm_tty, line, NULL);
 390         if (!self) {
 391                 /* No, so make new instance */
 392                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 393                 if (self == NULL) {
 394                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 395                         return -ENOMEM;
 396                 }
 397
 398                 tty_port_init(&self->port);
 399                 self->port.ops = &ircomm_port_ops;
 400                 self->magic = IRCOMM_TTY_MAGIC;
 401                 self->flow = FLOW_STOP;
 402
 403                 self->line = line;
 404                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 405                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 406                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 407
 408                 /* Init some important stuff */
 409                 init_timer(&self->watchdog_timer);
 410                 spin_lock_init(&self->spinlock);
 411
 412                 /*
 413                  * Force TTY into raw mode by default which is usually what
 414                  * we want for IrCOMM and IrLPT. This way applications will
 415                  * not have to twiddle with printcap etc.
 416                  *
 417                  * Note this is completely usafe and doesn't work properly
 418                  */
 419                 tty->termios.c_iflag = 0;
 420                 tty->termios.c_oflag = 0;
 421
 422                 /* Insert into hash */
 423                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 424         }
 425
 426         tty->driver_data = self;
 427
 428         return tty_port_install(&self->port, driver, tty);
 429 }
 430
 431 /*
 432  * Function ircomm_tty_open (tty, filp)
 433  *
 434  *    This routine is called when a particular tty device is opened. This
 435  *    routine is mandatory; if this routine is not filled in, the attempted
 436  *    open will fail with ENODEV.
 437  */
 438 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 439 {
 440         struct ircomm_tty_cb *self = tty->driver_data;
 441         unsigned long   flags;
 442         int ret;
 443
 444         IRDA_DEBUG(2, "%s()\n", __func__ );
 445
 446         /* ++ is not atomic, so this should be protected - Jean II */
 447         spin_lock_irqsave(&self->port.lock, flags);
 448         self->port.count++;
 449         spin_unlock_irqrestore(&self->port.lock, flags);
 450         tty_port_tty_set(&self->port, tty);
 451
 452         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 453                    self->line, self->port.count);
 454
 455         /* Not really used by us, but lets do it anyway */
 456         self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 457
 458         /*
 459          * If the port is the middle of closing, bail out now
 460          */
 461         if (tty_hung_up_p(filp) ||
 462             test_bit(ASYNCB_CLOSING, &self->port.flags)) {
 463
 464                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 465                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 466                  * IMHO it's either not needed in the first place
 467                  * or for some reason we need to make sure the async
 468                  * closing has been finished - if so, wouldn't we
 469                  * probably better sleep uninterruptible?
 470                  */
 471
 472                 if (wait_event_interruptible(self->port.close_wait,
 473                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
 474                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 475                                      __func__);
 476                         return -ERESTARTSYS;
 477                 }
 478
 479 #ifdef SERIAL_DO_RESTART
 480                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
 481                         -EAGAIN : -ERESTARTSYS;
 482 #else
 483                 return -EAGAIN;
 484 #endif
 485         }
 486
 487         /* Check if this is a "normal" ircomm device, or an irlpt device */
 488         if (self->line < 0x10) {
 489                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 490                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 491                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 492                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 493                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 494         } else {
 495                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 496                 self->service_type = IRCOMM_3_WIRE_RAW;
 497                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 498         }
 499
 500         ret = ircomm_tty_startup(self);
 501         if (ret)
 502                 return ret;
 503
 504         ret = ircomm_tty_block_til_ready(self, tty, filp);
 505         if (ret) {
 506                 IRDA_DEBUG(2,
 507                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 508                       ret);
 509
 510                 return ret;
 511         }
 512         return 0;
 513 }
 514
 515 /*
 516  * Function ircomm_tty_close (tty, filp)
 517  *
 518  *    This routine is called when a particular tty device is closed.
 519  *
 520  */
 521 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 522 {
 523         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 524         struct tty_port *port = &self->port;
 525
 526         IRDA_DEBUG(0, "%s()\n", __func__ );
 527
 528         IRDA_ASSERT(self != NULL, return;);
 529         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 530
 531         if (tty_port_close_start(port, tty, filp) == 0)
 532                 return;
 533
 534         ircomm_tty_shutdown(self);
 535
 536         tty_driver_flush_buffer(tty);
 537
 538         tty_port_close_end(port, tty);
 539         tty_port_tty_set(port, NULL);
 540 }
 541
 542 /*
 543  * Function ircomm_tty_flush_buffer (tty)
 544  *
 545  *
 546  *
 547  */
 548 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 549 {
 550         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 551
 552         IRDA_ASSERT(self != NULL, return;);
 553         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 554
 555         /*
 556          * Let do_softint() do this to avoid race condition with
 557          * do_softint() ;-)
 558          */
 559         schedule_work(&self->tqueue);
 560 }
 561
 562 /*
 563  * Function ircomm_tty_do_softint (work)
 564  *
 565  *    We use this routine to give the write wakeup to the user at at a
 566  *    safe time (as fast as possible after write have completed). This
 567  *    can be compared to the Tx interrupt.
 568  */
 569 static void ircomm_tty_do_softint(struct work_struct *work)
 570 {
 571         struct ircomm_tty_cb *self =
 572                 container_of(work, struct ircomm_tty_cb, tqueue);
 573         struct tty_struct *tty;
 574         unsigned long flags;
 575         struct sk_buff *skb, *ctrl_skb;
 576
 577         IRDA_DEBUG(2, "%s()\n", __func__ );
 578
 579         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 580                 return;
 581
 582         tty = tty_port_tty_get(&self->port);
 583         if (!tty)
 584                 return;
 585
 586         /* Unlink control buffer */
 587         spin_lock_irqsave(&self->spinlock, flags);
 588
 589         ctrl_skb = self->ctrl_skb;
 590         self->ctrl_skb = NULL;
 591
 592         spin_unlock_irqrestore(&self->spinlock, flags);
 593
 594         /* Flush control buffer if any */
 595         if(ctrl_skb) {
 596                 if(self->flow == FLOW_START)
 597                         ircomm_control_request(self->ircomm, ctrl_skb);
 598                 /* Drop reference count - see ircomm_ttp_data_request(). */
 599                 dev_kfree_skb(ctrl_skb);
 600         }
 601
 602         if (tty->hw_stopped)
 603                 goto put;
 604
 605         /* Unlink transmit buffer */
 606         spin_lock_irqsave(&self->spinlock, flags);
 607
 608         skb = self->tx_skb;
 609         self->tx_skb = NULL;
 610
 611         spin_unlock_irqrestore(&self->spinlock, flags);
 612
 613         /* Flush transmit buffer if any */
 614         if (skb) {
 615                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 616                 /* Drop reference count - see ircomm_ttp_data_request(). */
 617                 dev_kfree_skb(skb);
 618         }
 619
 620         /* Check if user (still) wants to be waken up */
 621         tty_wakeup(tty);
 622 put:
 623         tty_kref_put(tty);
 624 }
 625
 626 /*
 627  * Function ircomm_tty_write (tty, buf, count)
 628  *
 629  *    This routine is called by the kernel to write a series of characters
 630  *    to the tty device. The characters may come from user space or kernel
 631  *    space. This routine will return the number of characters actually
 632  *    accepted for writing. This routine is mandatory.
 633  */
 634 static int ircomm_tty_write(struct tty_struct *tty,
 635                             const unsigned char *buf, int count)
 636 {
 637         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 638         unsigned long flags;
 639         struct sk_buff *skb;
 640         int tailroom = 0;
 641         int len = 0;
 642         int size;
 643
 644         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 645                    tty->hw_stopped);
 646
 647         IRDA_ASSERT(self != NULL, return -1;);
 648         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 649
 650         /* We may receive packets from the TTY even before we have finished
 651          * our setup. Not cool.
 652          * The problem is that we don't know the final header and data size
 653          * to create the proper skb, so any skb we would create would have
 654          * bogus header and data size, so need care.
 655          * We use a bogus header size to safely detect this condition.
 656          * Another problem is that hw_stopped was set to 0 way before it
 657          * should be, so we would drop this skb. It should now be fixed.
 658          * One option is to not accept data until we are properly setup.
 659          * But, I suspect that when it happens, the ppp line discipline
 660          * just "drops" the data, which might screw up connect scripts.
 661          * The second option is to create a "safe skb", with large header
 662          * and small size (see ircomm_tty_open() for values).
 663          * We just need to make sure that when the real values get filled,
 664          * we don't mess up the original "safe skb" (see tx_data_size).
 665          * Jean II */
 666         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 667                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 668 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 669                 /* We didn't consume anything, TTY will retry */
 670                 return 0;
 671 #endif
 672         }
 673
 674         if (count < 1)
 675                 return 0;
 676
 677         /* Protect our manipulation of self->tx_skb and related */
 678         spin_lock_irqsave(&self->spinlock, flags);
 679
 680         /* Fetch current transmit buffer */
 681         skb = self->tx_skb;
 682
 683         /*
 684          * Send out all the data we get, possibly as multiple fragmented
 685          * frames, but this will only happen if the data is larger than the
 686          * max data size. The normal case however is just the opposite, and
 687          * this function may be called multiple times, and will then actually
 688          * defragment the data and send it out as one packet as soon as
 689          * possible, but at a safer point in time
 690          */
 691         while (count) {
 692                 size = count;
 693
 694                 /* Adjust data size to the max data size */
 695                 if (size > self->max_data_size)
 696                         size = self->max_data_size;
 697
 698                 /*
 699                  * Do we already have a buffer ready for transmit, or do
 700                  * we need to allocate a new frame
 701                  */
 702                 if (skb) {
 703                         /*
 704                          * Any room for more data at the end of the current
 705                          * transmit buffer? Cannot use skb_tailroom, since
 706                          * dev_alloc_skb gives us a larger skb than we
 707                          * requested
 708                          * Note : use tx_data_size, because max_data_size
 709                          * may have changed and we don't want to overwrite
 710                          * the skb. - Jean II
 711                          */
 712                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 713                                 /* Adjust data to tailroom */
 714                                 if (size > tailroom)
 715                                         size = tailroom;
 716                         } else {
 717                                 /*
 718                                  * Current transmit frame is full, so break
 719                                  * out, so we can send it as soon as possible
 720                                  */
 721                                 break;
 722                         }
 723                 } else {
 724                         /* Prepare a full sized frame */
 725                         skb = alloc_skb(self->max_data_size+
 726                                         self->max_header_size,
 727                                         GFP_ATOMIC);
 728                         if (!skb) {
 729                                 spin_unlock_irqrestore(&self->spinlock, flags);
 730                                 return -ENOBUFS;
 731                         }
 732                         skb_reserve(skb, self->max_header_size);
 733                         self->tx_skb = skb;
 734                         /* Remember skb size because max_data_size may
 735                          * change later on - Jean II */
 736                         self->tx_data_size = self->max_data_size;
 737                 }
 738
 739                 /* Copy data */
 740                 memcpy(skb_put(skb,size), buf + len, size);
 741
 742                 count -= size;
 743                 len += size;
 744         }
 745
 746         spin_unlock_irqrestore(&self->spinlock, flags);
 747
 748         /*
 749          * Schedule a new thread which will transmit the frame as soon
 750          * as possible, but at a safe point in time. We do this so the
 751          * "user" can give us data multiple times, as PPP does (because of
 752          * its 256 byte tx buffer). We will then defragment and send out
 753          * all this data as one single packet.
 754          */
 755         schedule_work(&self->tqueue);
 756
 757         return len;
 758 }
 759
 760 /*
 761  * Function ircomm_tty_write_room (tty)
 762  *
 763  *    This routine returns the numbers of characters the tty driver will
 764  *    accept for queuing to be written. This number is subject to change as
 765  *    output buffers get emptied, or if the output flow control is acted.
 766  */
 767 static int ircomm_tty_write_room(struct tty_struct *tty)
 768 {
 769         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 770         unsigned long flags;
 771         int ret;
 772
 773         IRDA_ASSERT(self != NULL, return -1;);
 774         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 775
 776 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 777         /* max_header_size tells us if the channel is initialised or not. */
 778         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 779                 /* Don't bother us yet */
 780                 return 0;
 781 #endif
 782
 783         /* Check if we are allowed to transmit any data.
 784          * hw_stopped is the regular flow control.
 785          * Jean II */
 786         if (tty->hw_stopped)
 787                 ret = 0;
 788         else {
 789                 spin_lock_irqsave(&self->spinlock, flags);
 790                 if (self->tx_skb)
 791                         ret = self->tx_data_size - self->tx_skb->len;
 792                 else
 793                         ret = self->max_data_size;
 794                 spin_unlock_irqrestore(&self->spinlock, flags);
 795         }
 796         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 797
 798         return ret;
 799 }
 800
 801 /*
 802  * Function ircomm_tty_wait_until_sent (tty, timeout)
 803  *
 804  *    This routine waits until the device has written out all of the
 805  *    characters in its transmitter FIFO.
 806  */
 807 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 808 {
 809         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 810         unsigned long orig_jiffies, poll_time;
 811         unsigned long flags;
 812
 813         IRDA_DEBUG(2, "%s()\n", __func__ );
 814
 815         IRDA_ASSERT(self != NULL, return;);
 816         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 817
 818         orig_jiffies = jiffies;
 819
 820         /* Set poll time to 200 ms */
 821         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 822
 823         spin_lock_irqsave(&self->spinlock, flags);
 824         while (self->tx_skb && self->tx_skb->len) {
 825                 spin_unlock_irqrestore(&self->spinlock, flags);
 826                 schedule_timeout_interruptible(poll_time);
 827                 spin_lock_irqsave(&self->spinlock, flags);
 828                 if (signal_pending(current))
 829                         break;
 830                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 831                         break;
 832         }
 833         spin_unlock_irqrestore(&self->spinlock, flags);
 834         current->state = TASK_RUNNING;
 835 }
 836
 837 /*
 838  * Function ircomm_tty_throttle (tty)
 839  *
 840  *    This routine notifies the tty driver that input buffers for the line
 841  *    discipline are close to full, and it should somehow signal that no
 842  *    more characters should be sent to the tty.
 843  */
 844 static void ircomm_tty_throttle(struct tty_struct *tty)
 845 {
 846         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 847
 848         IRDA_DEBUG(2, "%s()\n", __func__ );
 849
 850         IRDA_ASSERT(self != NULL, return;);
 851         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 852
 853         /* Software flow control? */
 854         if (I_IXOFF(tty))
 855                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 856
 857         /* Hardware flow control? */
 858         if (tty->termios.c_cflag & CRTSCTS) {
 859                 self->settings.dte &= ~IRCOMM_RTS;
 860                 self->settings.dte |= IRCOMM_DELTA_RTS;
 861
 862                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 863         }
 864
 865         ircomm_flow_request(self->ircomm, FLOW_STOP);
 866 }
 867
 868 /*
 869  * Function ircomm_tty_unthrottle (tty)
 870  *
 871  *    This routine notifies the tty drivers that it should signals that
 872  *    characters can now be sent to the tty without fear of overrunning the
 873  *    input buffers of the line disciplines.
 874  */
 875 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 876 {
 877         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 878
 879         IRDA_DEBUG(2, "%s()\n", __func__ );
 880
 881         IRDA_ASSERT(self != NULL, return;);
 882         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 883
 884         /* Using software flow control? */
 885         if (I_IXOFF(tty)) {
 886                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 887         }
 888
 889         /* Using hardware flow control? */
 890         if (tty->termios.c_cflag & CRTSCTS) {
 891                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 892
 893                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 894                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 895         }
 896         ircomm_flow_request(self->ircomm, FLOW_START);
 897 }
 898
 899 /*
 900  * Function ircomm_tty_chars_in_buffer (tty)
 901  *
 902  *    Indicates if there are any data in the buffer
 903  *
 904  */
 905 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 906 {
 907         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 908         unsigned long flags;
 909         int len = 0;
 910
 911         IRDA_ASSERT(self != NULL, return -1;);
 912         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 913
 914         spin_lock_irqsave(&self->spinlock, flags);
 915
 916         if (self->tx_skb)
 917                 len = self->tx_skb->len;
 918
 919         spin_unlock_irqrestore(&self->spinlock, flags);
 920
 921         return len;
 922 }
 923
 924 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 925 {
 926         unsigned long flags;
 927
 928         IRDA_ASSERT(self != NULL, return;);
 929         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 930
 931         IRDA_DEBUG(0, "%s()\n", __func__ );
 932
 933         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
 934                 return;
 935
 936         ircomm_tty_detach_cable(self);
 937
 938         spin_lock_irqsave(&self->spinlock, flags);
 939
 940         del_timer(&self->watchdog_timer);
 941
 942         /* Free parameter buffer */
 943         if (self->ctrl_skb) {
 944                 dev_kfree_skb(self->ctrl_skb);
 945                 self->ctrl_skb = NULL;
 946         }
 947
 948         /* Free transmit buffer */
 949         if (self->tx_skb) {
 950                 dev_kfree_skb(self->tx_skb);
 951                 self->tx_skb = NULL;
 952         }
 953
 954         if (self->ircomm) {
 955                 ircomm_close(self->ircomm);
 956                 self->ircomm = NULL;
 957         }
 958
 959         spin_unlock_irqrestore(&self->spinlock, flags);
 960 }
 961
 962 /*
 963  * Function ircomm_tty_hangup (tty)
 964  *
 965  *    This routine notifies the tty driver that it should hangup the tty
 966  *    device.
 967  *
 968  */
 969 static void ircomm_tty_hangup(struct tty_struct *tty)
 970 {
 971         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 972         struct tty_port *port = &self->port;
 973         unsigned long   flags;
 974
 975         IRDA_DEBUG(0, "%s()\n", __func__ );
 976
 977         IRDA_ASSERT(self != NULL, return;);
 978         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 979
 980         /* ircomm_tty_flush_buffer(tty); */
 981         ircomm_tty_shutdown(self);
 982
 983         spin_lock_irqsave(&port->lock, flags);
 984         port->flags &= ~ASYNC_NORMAL_ACTIVE;
 985         if (port->tty) {
 986                 set_bit(TTY_IO_ERROR, &port->tty->flags);
 987                 tty_kref_put(port->tty);
 988         }
 989         port->tty = NULL;
 990         port->count = 0;
 991         spin_unlock_irqrestore(&port->lock, flags);
 992
 993         wake_up_interruptible(&port->open_wait);
 994 }
 995
 996 /*
 997  * Function ircomm_tty_send_xchar (tty, ch)
 998  *
 999  *    This routine is used to send a high-priority XON/XOFF character to
1000  *    the device.
1001  */
1002 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1003 {
1004         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1005 }
1006
1007 /*
1008  * Function ircomm_tty_start (tty)
1009  *
1010  *    This routine notifies the tty driver that it resume sending
1011  *    characters to the tty device.
1012  */
1013 void ircomm_tty_start(struct tty_struct *tty)
1014 {
1015         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1016
1017         ircomm_flow_request(self->ircomm, FLOW_START);
1018 }
1019
1020 /*
1021  * Function ircomm_tty_stop (tty)
1022  *
1023  *     This routine notifies the tty driver that it should stop outputting
1024  *     characters to the tty device.
1025  */
1026 static void ircomm_tty_stop(struct tty_struct *tty)
1027 {
1028         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1029
1030         IRDA_ASSERT(self != NULL, return;);
1031         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1032
1033         ircomm_flow_request(self->ircomm, FLOW_STOP);
1034 }
1035
1036 /*
1037  * Function ircomm_check_modem_status (self)
1038  *
1039  *    Check for any changes in the DCE's line settings. This function should
1040  *    be called whenever the dce parameter settings changes, to update the
1041  *    flow control settings and other things
1042  */
1043 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1044 {
1045         struct tty_struct *tty;
1046         int status;
1047
1048         IRDA_DEBUG(0, "%s()\n", __func__ );
1049
1050         IRDA_ASSERT(self != NULL, return;);
1051         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1052
1053         tty = tty_port_tty_get(&self->port);
1054
1055         status = self->settings.dce;
1056
1057         if (status & IRCOMM_DCE_DELTA_ANY) {
1058                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1059         }
1060         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1061                 IRDA_DEBUG(2,
1062                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1063                            (status & IRCOMM_CD) ? "on" : "off");
1064
1065                 if (status & IRCOMM_CD) {
1066                         wake_up_interruptible(&self->port.open_wait);
1067                 } else {
1068                         IRDA_DEBUG(2,
1069                                    "%s(), Doing serial hangup..\n", __func__ );
1070                         if (tty)
1071                                 tty_hangup(tty);
1072
1073                         /* Hangup will remote the tty, so better break out */
1074                         goto put;
1075                 }
1076         }
1077         if (tty && tty_port_cts_enabled(&self->port)) {
1078                 if (tty->hw_stopped) {
1079                         if (status & IRCOMM_CTS) {
1080                                 IRDA_DEBUG(2,
1081                                            "%s(), CTS tx start...\n", __func__ );
1082                                 tty->hw_stopped = 0;
1083
1084                                 /* Wake up processes blocked on open */
1085                                 wake_up_interruptible(&self->port.open_wait);
1086
1087                                 schedule_work(&self->tqueue);
1088                                 goto put;
1089                         }
1090                 } else {
1091                         if (!(status & IRCOMM_CTS)) {
1092                                 IRDA_DEBUG(2,
1093                                            "%s(), CTS tx stop...\n", __func__ );
1094                                 tty->hw_stopped = 1;
1095                         }
1096                 }
1097         }
1098 put:
1099         tty_kref_put(tty);
1100 }
1101
1102 /*
1103  * Function ircomm_tty_data_indication (instance, sap, skb)
1104  *
1105  *    Handle incoming data, and deliver it to the line discipline
1106  *
1107  */
1108 static int ircomm_tty_data_indication(void *instance, void *sap,
1109                                       struct sk_buff *skb)
1110 {
1111         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1112         struct tty_struct *tty;
1113
1114         IRDA_DEBUG(2, "%s()\n", __func__ );
1115
1116         IRDA_ASSERT(self != NULL, return -1;);
1117         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1118         IRDA_ASSERT(skb != NULL, return -1;);
1119
1120         tty = tty_port_tty_get(&self->port);
1121         if (!tty) {
1122                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1123                 return 0;
1124         }
1125
1126         /*
1127          * If we receive data when hardware is stopped then something is wrong.
1128          * We try to poll the peers line settings to check if we are up todate.
1129          * Devices like WinCE can do this, and since they don't send any
1130          * params, we can just as well declare the hardware for running.
1131          */
1132         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1133                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1134                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1135
1136                 /* We can just as well declare the hardware for running */
1137                 ircomm_tty_send_initial_parameters(self);
1138                 ircomm_tty_link_established(self);
1139         }
1140         tty_kref_put(tty);
1141
1142         /*
1143          * Use flip buffer functions since the code may be called from interrupt
1144          * context
1145          */
1146         tty_insert_flip_string(&self->port, skb->data, skb->len);
1147         tty_flip_buffer_push(&self->port);
1148
1149         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1150
1151         return 0;
1152 }
1153
1154 /*
1155  * Function ircomm_tty_control_indication (instance, sap, skb)
1156  *
1157  *    Parse all incoming parameters (easy!)
1158  *
1159  */
1160 static int ircomm_tty_control_indication(void *instance, void *sap,
1161                                          struct sk_buff *skb)
1162 {
1163         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1164         int clen;
1165
1166         IRDA_DEBUG(4, "%s()\n", __func__ );
1167
1168         IRDA_ASSERT(self != NULL, return -1;);
1169         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1170         IRDA_ASSERT(skb != NULL, return -1;);
1171
1172         clen = skb->data[0];
1173
1174         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1175                                &ircomm_param_info);
1176
1177         /* No need to kfree_skb - see ircomm_control_indication() */
1178
1179         return 0;
1180 }
1181
1182 /*
1183  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1184  *
1185  *    This function is called by IrTTP when it wants us to slow down the
1186  *    transmission of data. We just mark the hardware as stopped, and wait
1187  *    for IrTTP to notify us that things are OK again.
1188  */
1189 static void ircomm_tty_flow_indication(void *instance, void *sap,
1190                                        LOCAL_FLOW cmd)
1191 {
1192         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1193         struct tty_struct *tty;
1194
1195         IRDA_ASSERT(self != NULL, return;);
1196         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1197
1198         tty = tty_port_tty_get(&self->port);
1199
1200         switch (cmd) {
1201         case FLOW_START:
1202                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1203                 if (tty)
1204                         tty->hw_stopped = 0;
1205
1206                 /* ircomm_tty_do_softint will take care of the rest */
1207                 schedule_work(&self->tqueue);
1208                 break;
1209         default:  /* If we get here, something is very wrong, better stop */
1210         case FLOW_STOP:
1211                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1212                 if (tty)
1213                         tty->hw_stopped = 1;
1214                 break;
1215         }
1216
1217         tty_kref_put(tty);
1218         self->flow = cmd;
1219 }
1220
1221 #ifdef CONFIG_PROC_FS
1222 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1223 {
1224         struct tty_struct *tty;
1225         char sep;
1226
1227         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1228
1229         seq_puts(m, "Service type: ");
1230         if (self->service_type & IRCOMM_9_WIRE)
1231                 seq_puts(m, "9_WIRE");
1232         else if (self->service_type & IRCOMM_3_WIRE)
1233                 seq_puts(m, "3_WIRE");
1234         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1235                 seq_puts(m, "3_WIRE_RAW");
1236         else
1237                 seq_puts(m, "No common service type!\n");
1238         seq_putc(m, '\n');
1239
1240         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1241
1242         seq_printf(m, "DTE status:");
1243         sep = ' ';
1244         if (self->settings.dte & IRCOMM_RTS) {
1245                 seq_printf(m, "%cRTS", sep);
1246                 sep = '|';
1247         }
1248         if (self->settings.dte & IRCOMM_DTR) {
1249                 seq_printf(m, "%cDTR", sep);
1250                 sep = '|';
1251         }
1252         seq_putc(m, '\n');
1253
1254         seq_puts(m, "DCE status:");
1255         sep = ' ';
1256         if (self->settings.dce & IRCOMM_CTS) {
1257                 seq_printf(m, "%cCTS", sep);
1258                 sep = '|';
1259         }
1260         if (self->settings.dce & IRCOMM_DSR) {
1261                 seq_printf(m, "%cDSR", sep);
1262                 sep = '|';
1263         }
1264         if (self->settings.dce & IRCOMM_CD) {
1265                 seq_printf(m, "%cCD", sep);
1266                 sep = '|';
1267         }
1268         if (self->settings.dce & IRCOMM_RI) {
1269                 seq_printf(m, "%cRI", sep);
1270                 sep = '|';
1271         }
1272         seq_putc(m, '\n');
1273
1274         seq_puts(m, "Configuration: ");
1275         if (!self->settings.null_modem)
1276                 seq_puts(m, "DTE <-> DCE\n");
1277         else
1278                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1279
1280         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1281
1282         seq_puts(m, "Flow control:");
1283         sep = ' ';
1284         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1285                 seq_printf(m, "%cXON_XOFF_IN", sep);
1286                 sep = '|';
1287         }
1288         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1289                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1290                 sep = '|';
1291         }
1292         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1293                 seq_printf(m, "%cRTS_CTS_IN", sep);
1294                 sep = '|';
1295         }
1296         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1297                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1298                 sep = '|';
1299         }
1300         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1301                 seq_printf(m, "%cDSR_DTR_IN", sep);
1302                 sep = '|';
1303         }
1304         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1305                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1306                 sep = '|';
1307         }
1308         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1309                 seq_printf(m, "%cENQ_ACK_IN", sep);
1310                 sep = '|';
1311         }
1312         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1313                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1314                 sep = '|';
1315         }
1316         seq_putc(m, '\n');
1317
1318         seq_puts(m, "Flags:");
1319         sep = ' ';
1320         if (tty_port_cts_enabled(&self->port)) {
1321                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1322                 sep = '|';
1323         }
1324         if (self->port.flags & ASYNC_CHECK_CD) {
1325                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1326                 sep = '|';
1327         }
1328         if (self->port.flags & ASYNC_INITIALIZED) {
1329                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1330                 sep = '|';
1331         }
1332         if (self->port.flags & ASYNC_LOW_LATENCY) {
1333                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1334                 sep = '|';
1335         }
1336         if (self->port.flags & ASYNC_CLOSING) {
1337                 seq_printf(m, "%cASYNC_CLOSING", sep);
1338                 sep = '|';
1339         }
1340         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1341                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1342                 sep = '|';
1343         }
1344         seq_putc(m, '\n');
1345
1346         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1347         seq_printf(m, "Open count: %d\n", self->port.count);
1348         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1349         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1350
1351         tty = tty_port_tty_get(&self->port);
1352         if (tty) {
1353                 seq_printf(m, "Hardware: %s\n",
1354                                tty->hw_stopped ? "Stopped" : "Running");
1355                 tty_kref_put(tty);
1356         }
1357 }
1358
1359 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1360 {
1361         struct ircomm_tty_cb *self;
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1365
1366         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1367         while (self != NULL) {
1368                 if (self->magic != IRCOMM_TTY_MAGIC)
1369                         break;
1370
1371                 ircomm_tty_line_info(self, m);
1372                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1373         }
1374         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1375         return 0;
1376 }
1377
1378 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1379 {
1380         return single_open(file, ircomm_tty_proc_show, NULL);
1381 }
1382
1383 static const struct file_operations ircomm_tty_proc_fops = {
1384         .owner          = THIS_MODULE,
1385         .open           = ircomm_tty_proc_open,
1386         .read           = seq_read,
1387         .llseek         = seq_lseek,
1388         .release        = single_release,
1389 };
1390 #endif /* CONFIG_PROC_FS */
1391
1392 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1393 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1394 MODULE_LICENSE("GPL");
1395 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1396
1397 module_init(ircomm_tty_init);
1398 module_exit(ircomm_tty_cleanup);