Pileus Git - ~andy/linux/blob - 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, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/slab.h>
  37 #include <linux/sched.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/termios.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  44
  45 #include <asm/uaccess.h>
  46
  47 #include <net/irda/irda.h>
  48 #include <net/irda/irmod.h>
  49
  50 #include <net/irda/ircomm_core.h>
  51 #include <net/irda/ircomm_param.h>
  52 #include <net/irda/ircomm_tty_attach.h>
  53 #include <net/irda/ircomm_tty.h>
  54
  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         .open            = ircomm_tty_open,
  86         .close           = ircomm_tty_close,
  87         .write           = ircomm_tty_write,
  88         .write_room      = ircomm_tty_write_room,
  89         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  90         .flush_buffer    = ircomm_tty_flush_buffer,
  91         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  92         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  93         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  94         .throttle        = ircomm_tty_throttle,
  95         .unthrottle      = ircomm_tty_unthrottle,
  96         .send_xchar      = ircomm_tty_send_xchar,
  97         .set_termios     = ircomm_tty_set_termios,
  98         .stop            = ircomm_tty_stop,
  99         .start           = ircomm_tty_start,
 100         .hangup          = ircomm_tty_hangup,
 101         .wait_until_sent = ircomm_tty_wait_until_sent,
 102 #ifdef CONFIG_PROC_FS
 103         .proc_fops       = &ircomm_tty_proc_fops,
 104 #endif /* CONFIG_PROC_FS */
 105 };
 106
 107 static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
 108 {
 109         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 110                         port);
 111         /*
 112          * Here, we use to lock those two guys, but as ircomm_param_request()
 113          * does it itself, I don't see the point (and I see the deadlock).
 114          * Jean II
 115          */
 116         if (raise)
 117                 self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
 118         else
 119                 self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
 120
 121         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 122 }
 123
 124 static int ircomm_port_carrier_raised(struct tty_port *port)
 125 {
 126         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 127                         port);
 128         return self->settings.dce & IRCOMM_CD;
 129 }
 130
 131 static const struct tty_port_operations ircomm_port_ops = {
 132         .dtr_rts = ircomm_port_raise_dtr_rts,
 133         .carrier_raised = ircomm_port_carrier_raised,
 134 };
 135
 136 /*
 137  * Function ircomm_tty_init()
 138  *
 139  *    Init IrCOMM TTY layer/driver
 140  *
 141  */
 142 static int __init ircomm_tty_init(void)
 143 {
 144         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 145         if (!driver)
 146                 return -ENOMEM;
 147         ircomm_tty = hashbin_new(HB_LOCK);
 148         if (ircomm_tty == NULL) {
 149                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 150                 put_tty_driver(driver);
 151                 return -ENOMEM;
 152         }
 153
 154         driver->driver_name     = "ircomm";
 155         driver->name            = "ircomm";
 156         driver->major           = IRCOMM_TTY_MAJOR;
 157         driver->minor_start     = IRCOMM_TTY_MINOR;
 158         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 159         driver->subtype         = SERIAL_TYPE_NORMAL;
 160         driver->init_termios    = tty_std_termios;
 161         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 162         driver->flags           = TTY_DRIVER_REAL_RAW;
 163         tty_set_operations(driver, &ops);
 164         if (tty_register_driver(driver)) {
 165                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 166                            __func__);
 167                 put_tty_driver(driver);
 168                 return -1;
 169         }
 170         return 0;
 171 }
 172
 173 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 174 {
 175         IRDA_DEBUG(0, "%s()\n", __func__ );
 176
 177         IRDA_ASSERT(self != NULL, return;);
 178         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 179
 180         ircomm_tty_shutdown(self);
 181
 182         self->magic = 0;
 183         kfree(self);
 184 }
 185
 186 /*
 187  * Function ircomm_tty_cleanup ()
 188  *
 189  *    Remove IrCOMM TTY layer/driver
 190  *
 191  */
 192 static void __exit ircomm_tty_cleanup(void)
 193 {
 194         int ret;
 195
 196         IRDA_DEBUG(4, "%s()\n", __func__ );
 197
 198         ret = tty_unregister_driver(driver);
 199         if (ret) {
 200                 IRDA_ERROR("%s(), failed to unregister driver\n",
 201                            __func__);
 202                 return;
 203         }
 204
 205         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 206         put_tty_driver(driver);
 207 }
 208
 209 /*
 210  * Function ircomm_startup (self)
 211  *
 212  *
 213  *
 214  */
 215 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 216 {
 217         notify_t notify;
 218         int ret = -ENODEV;
 219
 220         IRDA_DEBUG(2, "%s()\n", __func__ );
 221
 222         IRDA_ASSERT(self != NULL, return -1;);
 223         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 224
 225         /* Check if already open */
 226         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
 227                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 228                 return 0;
 229         }
 230
 231         /* Register with IrCOMM */
 232         irda_notify_init(&notify);
 233         /* These callbacks we must handle ourselves */
 234         notify.data_indication       = ircomm_tty_data_indication;
 235         notify.udata_indication      = ircomm_tty_control_indication;
 236         notify.flow_indication       = ircomm_tty_flow_indication;
 237
 238         /* Use the ircomm_tty interface for these ones */
 239         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 240         notify.connect_confirm       = ircomm_tty_connect_confirm;
 241         notify.connect_indication    = ircomm_tty_connect_indication;
 242         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 243         notify.instance = self;
 244
 245         if (!self->ircomm) {
 246                 self->ircomm = ircomm_open(&notify, self->service_type,
 247                                            self->line);
 248         }
 249         if (!self->ircomm)
 250                 goto err;
 251
 252         self->slsap_sel = self->ircomm->slsap_sel;
 253
 254         /* Connect IrCOMM link with remote device */
 255         ret = ircomm_tty_attach_cable(self);
 256         if (ret < 0) {
 257                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 258                 goto err;
 259         }
 260
 261         return 0;
 262 err:
 263         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
 264         return ret;
 265 }
 266
 267 /*
 268  * Function ircomm_block_til_ready (self, filp)
 269  *
 270  *
 271  *
 272  */
 273 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 274                 struct tty_struct *tty, struct file *filp)
 275 {
 276         struct tty_port *port = &self->port;
 277         DECLARE_WAITQUEUE(wait, current);
 278         int             retval;
 279         int             do_clocal = 0, extra_count = 0;
 280         unsigned long   flags;
 281
 282         IRDA_DEBUG(2, "%s()\n", __func__ );
 283
 284         /*
 285          * If non-blocking mode is set, or the port is not enabled,
 286          * then make the check up front and then exit.
 287          */
 288         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 289                 /* nonblock mode is set or port is not enabled */
 290                 port->flags |= ASYNC_NORMAL_ACTIVE;
 291                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 292                 return 0;
 293         }
 294
 295         if (tty->termios->c_cflag & CLOCAL) {
 296                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 297                 do_clocal = 1;
 298         }
 299
 300         /* Wait for carrier detect and the line to become
 301          * free (i.e., not in use by the callout).  While we are in
 302          * this loop, port->count is dropped by one, so that
 303          * mgsl_close() knows when to free things.  We restore it upon
 304          * exit, either normal or abnormal.
 305          */
 306
 307         retval = 0;
 308         add_wait_queue(&port->open_wait, &wait);
 309
 310         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 311               __FILE__, __LINE__, tty->driver->name, port->count);
 312
 313         spin_lock_irqsave(&port->lock, flags);
 314         if (!tty_hung_up_p(filp)) {
 315                 extra_count = 1;
 316                 port->count--;
 317         }
 318         spin_unlock_irqrestore(&port->lock, flags);
 319         port->blocked_open++;
 320
 321         while (1) {
 322                 if (tty->termios->c_cflag & CBAUD)
 323                         tty_port_raise_dtr_rts(port);
 324
 325                 current->state = TASK_INTERRUPTIBLE;
 326
 327                 if (tty_hung_up_p(filp) ||
 328                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 329                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
 330                                         -EAGAIN : -ERESTARTSYS;
 331                         break;
 332                 }
 333
 334                 /*
 335                  * Check if link is ready now. Even if CLOCAL is
 336                  * specified, we cannot return before the IrCOMM link is
 337                  * ready
 338                  */
 339                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
 340                     (do_clocal || tty_port_carrier_raised(port)) &&
 341                     self->state == IRCOMM_TTY_READY)
 342                 {
 343                         break;
 344                 }
 345
 346                 if (signal_pending(current)) {
 347                         retval = -ERESTARTSYS;
 348                         break;
 349                 }
 350
 351                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 352                       __FILE__, __LINE__, tty->driver->name, port->count);
 353
 354                 schedule();
 355         }
 356
 357         __set_current_state(TASK_RUNNING);
 358         remove_wait_queue(&port->open_wait, &wait);
 359
 360         if (extra_count) {
 361                 /* ++ is not atomic, so this should be protected - Jean II */
 362                 spin_lock_irqsave(&port->lock, flags);
 363                 port->count++;
 364                 spin_unlock_irqrestore(&port->lock, flags);
 365         }
 366         port->blocked_open--;
 367
 368         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 369               __FILE__, __LINE__, tty->driver->name, port->count);
 370
 371         if (!retval)
 372                 port->flags |= ASYNC_NORMAL_ACTIVE;
 373
 374         return retval;
 375 }
 376
 377 /*
 378  * Function ircomm_tty_open (tty, filp)
 379  *
 380  *    This routine is called when a particular tty device is opened. This
 381  *    routine is mandatory; if this routine is not filled in, the attempted
 382  *    open will fail with ENODEV.
 383  */
 384 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 385 {
 386         struct ircomm_tty_cb *self;
 387         unsigned int line = tty->index;
 388         unsigned long   flags;
 389         int ret;
 390
 391         IRDA_DEBUG(2, "%s()\n", __func__ );
 392
 393         /* Check if instance already exists */
 394         self = hashbin_lock_find(ircomm_tty, line, NULL);
 395         if (!self) {
 396                 /* No, so make new instance */
 397                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 398                 if (self == NULL) {
 399                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 400                         return -ENOMEM;
 401                 }
 402
 403                 tty_port_init(&self->port);
 404                 self->port.ops = &ircomm_port_ops;
 405                 self->magic = IRCOMM_TTY_MAGIC;
 406                 self->flow = FLOW_STOP;
 407
 408                 self->line = line;
 409                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 410                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 411                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 412
 413                 /* Init some important stuff */
 414                 init_timer(&self->watchdog_timer);
 415                 spin_lock_init(&self->spinlock);
 416
 417                 /*
 418                  * Force TTY into raw mode by default which is usually what
 419                  * we want for IrCOMM and IrLPT. This way applications will
 420                  * not have to twiddle with printcap etc.
 421                  *
 422                  * Note this is completely usafe and doesn't work properly
 423                  */
 424                 tty->termios->c_iflag = 0;
 425                 tty->termios->c_oflag = 0;
 426
 427                 /* Insert into hash */
 428                 /* FIXME there is a window from find to here */
 429                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 430         }
 431         /* ++ is not atomic, so this should be protected - Jean II */
 432         spin_lock_irqsave(&self->port.lock, flags);
 433         self->port.count++;
 434
 435         tty->driver_data = self;
 436         spin_unlock_irqrestore(&self->port.lock, flags);
 437         tty_port_tty_set(&self->port, tty);
 438
 439         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 440                    self->line, self->port.count);
 441
 442         /* Not really used by us, but lets do it anyway */
 443         tty->low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 444
 445         /*
 446          * If the port is the middle of closing, bail out now
 447          */
 448         if (tty_hung_up_p(filp) ||
 449             test_bit(ASYNCB_CLOSING, &self->port.flags)) {
 450
 451                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 452                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 453                  * IMHO it's either not needed in the first place
 454                  * or for some reason we need to make sure the async
 455                  * closing has been finished - if so, wouldn't we
 456                  * probably better sleep uninterruptible?
 457                  */
 458
 459                 if (wait_event_interruptible(self->port.close_wait,
 460                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
 461                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 462                                      __func__);
 463                         return -ERESTARTSYS;
 464                 }
 465
 466 #ifdef SERIAL_DO_RESTART
 467                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
 468                         -EAGAIN : -ERESTARTSYS;
 469 #else
 470                 return -EAGAIN;
 471 #endif
 472         }
 473
 474         /* Check if this is a "normal" ircomm device, or an irlpt device */
 475         if (line < 0x10) {
 476                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 477                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 478                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 479                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 480                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 481         } else {
 482                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 483                 self->service_type = IRCOMM_3_WIRE_RAW;
 484                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 485         }
 486
 487         ret = ircomm_tty_startup(self);
 488         if (ret)
 489                 return ret;
 490
 491         ret = ircomm_tty_block_til_ready(self, tty, filp);
 492         if (ret) {
 493                 IRDA_DEBUG(2,
 494                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 495                       ret);
 496
 497                 return ret;
 498         }
 499         return 0;
 500 }
 501
 502 /*
 503  * Function ircomm_tty_close (tty, filp)
 504  *
 505  *    This routine is called when a particular tty device is closed.
 506  *
 507  */
 508 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 509 {
 510         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 511         struct tty_port *port = &self->port;
 512
 513         IRDA_DEBUG(0, "%s()\n", __func__ );
 514
 515         IRDA_ASSERT(self != NULL, return;);
 516         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 517
 518         if (tty_port_close_start(port, tty, filp) == 0)
 519                 return;
 520
 521         ircomm_tty_shutdown(self);
 522
 523         tty_driver_flush_buffer(tty);
 524
 525         tty_port_close_end(port, tty);
 526         tty_port_tty_set(port, NULL);
 527 }
 528
 529 /*
 530  * Function ircomm_tty_flush_buffer (tty)
 531  *
 532  *
 533  *
 534  */
 535 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 536 {
 537         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 538
 539         IRDA_ASSERT(self != NULL, return;);
 540         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 541
 542         /*
 543          * Let do_softint() do this to avoid race condition with
 544          * do_softint() ;-)
 545          */
 546         schedule_work(&self->tqueue);
 547 }
 548
 549 /*
 550  * Function ircomm_tty_do_softint (work)
 551  *
 552  *    We use this routine to give the write wakeup to the user at at a
 553  *    safe time (as fast as possible after write have completed). This
 554  *    can be compared to the Tx interrupt.
 555  */
 556 static void ircomm_tty_do_softint(struct work_struct *work)
 557 {
 558         struct ircomm_tty_cb *self =
 559                 container_of(work, struct ircomm_tty_cb, tqueue);
 560         struct tty_struct *tty;
 561         unsigned long flags;
 562         struct sk_buff *skb, *ctrl_skb;
 563
 564         IRDA_DEBUG(2, "%s()\n", __func__ );
 565
 566         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 567                 return;
 568
 569         tty = tty_port_tty_get(&self->port);
 570         if (!tty)
 571                 return;
 572
 573         /* Unlink control buffer */
 574         spin_lock_irqsave(&self->spinlock, flags);
 575
 576         ctrl_skb = self->ctrl_skb;
 577         self->ctrl_skb = NULL;
 578
 579         spin_unlock_irqrestore(&self->spinlock, flags);
 580
 581         /* Flush control buffer if any */
 582         if(ctrl_skb) {
 583                 if(self->flow == FLOW_START)
 584                         ircomm_control_request(self->ircomm, ctrl_skb);
 585                 /* Drop reference count - see ircomm_ttp_data_request(). */
 586                 dev_kfree_skb(ctrl_skb);
 587         }
 588
 589         if (tty->hw_stopped)
 590                 goto put;
 591
 592         /* Unlink transmit buffer */
 593         spin_lock_irqsave(&self->spinlock, flags);
 594
 595         skb = self->tx_skb;
 596         self->tx_skb = NULL;
 597
 598         spin_unlock_irqrestore(&self->spinlock, flags);
 599
 600         /* Flush transmit buffer if any */
 601         if (skb) {
 602                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 603                 /* Drop reference count - see ircomm_ttp_data_request(). */
 604                 dev_kfree_skb(skb);
 605         }
 606
 607         /* Check if user (still) wants to be waken up */
 608         tty_wakeup(tty);
 609 put:
 610         tty_kref_put(tty);
 611 }
 612
 613 /*
 614  * Function ircomm_tty_write (tty, buf, count)
 615  *
 616  *    This routine is called by the kernel to write a series of characters
 617  *    to the tty device. The characters may come from user space or kernel
 618  *    space. This routine will return the number of characters actually
 619  *    accepted for writing. This routine is mandatory.
 620  */
 621 static int ircomm_tty_write(struct tty_struct *tty,
 622                             const unsigned char *buf, int count)
 623 {
 624         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 625         unsigned long flags;
 626         struct sk_buff *skb;
 627         int tailroom = 0;
 628         int len = 0;
 629         int size;
 630
 631         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 632                    tty->hw_stopped);
 633
 634         IRDA_ASSERT(self != NULL, return -1;);
 635         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 636
 637         /* We may receive packets from the TTY even before we have finished
 638          * our setup. Not cool.
 639          * The problem is that we don't know the final header and data size
 640          * to create the proper skb, so any skb we would create would have
 641          * bogus header and data size, so need care.
 642          * We use a bogus header size to safely detect this condition.
 643          * Another problem is that hw_stopped was set to 0 way before it
 644          * should be, so we would drop this skb. It should now be fixed.
 645          * One option is to not accept data until we are properly setup.
 646          * But, I suspect that when it happens, the ppp line discipline
 647          * just "drops" the data, which might screw up connect scripts.
 648          * The second option is to create a "safe skb", with large header
 649          * and small size (see ircomm_tty_open() for values).
 650          * We just need to make sure that when the real values get filled,
 651          * we don't mess up the original "safe skb" (see tx_data_size).
 652          * Jean II */
 653         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 654                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 655 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 656                 /* We didn't consume anything, TTY will retry */
 657                 return 0;
 658 #endif
 659         }
 660
 661         if (count < 1)
 662                 return 0;
 663
 664         /* Protect our manipulation of self->tx_skb and related */
 665         spin_lock_irqsave(&self->spinlock, flags);
 666
 667         /* Fetch current transmit buffer */
 668         skb = self->tx_skb;
 669
 670         /*
 671          * Send out all the data we get, possibly as multiple fragmented
 672          * frames, but this will only happen if the data is larger than the
 673          * max data size. The normal case however is just the opposite, and
 674          * this function may be called multiple times, and will then actually
 675          * defragment the data and send it out as one packet as soon as
 676          * possible, but at a safer point in time
 677          */
 678         while (count) {
 679                 size = count;
 680
 681                 /* Adjust data size to the max data size */
 682                 if (size > self->max_data_size)
 683                         size = self->max_data_size;
 684
 685                 /*
 686                  * Do we already have a buffer ready for transmit, or do
 687                  * we need to allocate a new frame
 688                  */
 689                 if (skb) {
 690                         /*
 691                          * Any room for more data at the end of the current
 692                          * transmit buffer? Cannot use skb_tailroom, since
 693                          * dev_alloc_skb gives us a larger skb than we
 694                          * requested
 695                          * Note : use tx_data_size, because max_data_size
 696                          * may have changed and we don't want to overwrite
 697                          * the skb. - Jean II
 698                          */
 699                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 700                                 /* Adjust data to tailroom */
 701                                 if (size > tailroom)
 702                                         size = tailroom;
 703                         } else {
 704                                 /*
 705                                  * Current transmit frame is full, so break
 706                                  * out, so we can send it as soon as possible
 707                                  */
 708                                 break;
 709                         }
 710                 } else {
 711                         /* Prepare a full sized frame */
 712                         skb = alloc_skb(self->max_data_size+
 713                                         self->max_header_size,
 714                                         GFP_ATOMIC);
 715                         if (!skb) {
 716                                 spin_unlock_irqrestore(&self->spinlock, flags);
 717                                 return -ENOBUFS;
 718                         }
 719                         skb_reserve(skb, self->max_header_size);
 720                         self->tx_skb = skb;
 721                         /* Remember skb size because max_data_size may
 722                          * change later on - Jean II */
 723                         self->tx_data_size = self->max_data_size;
 724                 }
 725
 726                 /* Copy data */
 727                 memcpy(skb_put(skb,size), buf + len, size);
 728
 729                 count -= size;
 730                 len += size;
 731         }
 732
 733         spin_unlock_irqrestore(&self->spinlock, flags);
 734
 735         /*
 736          * Schedule a new thread which will transmit the frame as soon
 737          * as possible, but at a safe point in time. We do this so the
 738          * "user" can give us data multiple times, as PPP does (because of
 739          * its 256 byte tx buffer). We will then defragment and send out
 740          * all this data as one single packet.
 741          */
 742         schedule_work(&self->tqueue);
 743
 744         return len;
 745 }
 746
 747 /*
 748  * Function ircomm_tty_write_room (tty)
 749  *
 750  *    This routine returns the numbers of characters the tty driver will
 751  *    accept for queuing to be written. This number is subject to change as
 752  *    output buffers get emptied, or if the output flow control is acted.
 753  */
 754 static int ircomm_tty_write_room(struct tty_struct *tty)
 755 {
 756         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 757         unsigned long flags;
 758         int ret;
 759
 760         IRDA_ASSERT(self != NULL, return -1;);
 761         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 762
 763 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 764         /* max_header_size tells us if the channel is initialised or not. */
 765         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 766                 /* Don't bother us yet */
 767                 return 0;
 768 #endif
 769
 770         /* Check if we are allowed to transmit any data.
 771          * hw_stopped is the regular flow control.
 772          * Jean II */
 773         if (tty->hw_stopped)
 774                 ret = 0;
 775         else {
 776                 spin_lock_irqsave(&self->spinlock, flags);
 777                 if (self->tx_skb)
 778                         ret = self->tx_data_size - self->tx_skb->len;
 779                 else
 780                         ret = self->max_data_size;
 781                 spin_unlock_irqrestore(&self->spinlock, flags);
 782         }
 783         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 784
 785         return ret;
 786 }
 787
 788 /*
 789  * Function ircomm_tty_wait_until_sent (tty, timeout)
 790  *
 791  *    This routine waits until the device has written out all of the
 792  *    characters in its transmitter FIFO.
 793  */
 794 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 795 {
 796         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 797         unsigned long orig_jiffies, poll_time;
 798         unsigned long flags;
 799
 800         IRDA_DEBUG(2, "%s()\n", __func__ );
 801
 802         IRDA_ASSERT(self != NULL, return;);
 803         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 804
 805         orig_jiffies = jiffies;
 806
 807         /* Set poll time to 200 ms */
 808         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 809
 810         spin_lock_irqsave(&self->spinlock, flags);
 811         while (self->tx_skb && self->tx_skb->len) {
 812                 spin_unlock_irqrestore(&self->spinlock, flags);
 813                 schedule_timeout_interruptible(poll_time);
 814                 spin_lock_irqsave(&self->spinlock, flags);
 815                 if (signal_pending(current))
 816                         break;
 817                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 818                         break;
 819         }
 820         spin_unlock_irqrestore(&self->spinlock, flags);
 821         current->state = TASK_RUNNING;
 822 }
 823
 824 /*
 825  * Function ircomm_tty_throttle (tty)
 826  *
 827  *    This routine notifies the tty driver that input buffers for the line
 828  *    discipline are close to full, and it should somehow signal that no
 829  *    more characters should be sent to the tty.
 830  */
 831 static void ircomm_tty_throttle(struct tty_struct *tty)
 832 {
 833         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 834
 835         IRDA_DEBUG(2, "%s()\n", __func__ );
 836
 837         IRDA_ASSERT(self != NULL, return;);
 838         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 839
 840         /* Software flow control? */
 841         if (I_IXOFF(tty))
 842                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 843
 844         /* Hardware flow control? */
 845         if (tty->termios->c_cflag & CRTSCTS) {
 846                 self->settings.dte &= ~IRCOMM_RTS;
 847                 self->settings.dte |= IRCOMM_DELTA_RTS;
 848
 849                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 850         }
 851
 852         ircomm_flow_request(self->ircomm, FLOW_STOP);
 853 }
 854
 855 /*
 856  * Function ircomm_tty_unthrottle (tty)
 857  *
 858  *    This routine notifies the tty drivers that it should signals that
 859  *    characters can now be sent to the tty without fear of overrunning the
 860  *    input buffers of the line disciplines.
 861  */
 862 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 863 {
 864         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 865
 866         IRDA_DEBUG(2, "%s()\n", __func__ );
 867
 868         IRDA_ASSERT(self != NULL, return;);
 869         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 870
 871         /* Using software flow control? */
 872         if (I_IXOFF(tty)) {
 873                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 874         }
 875
 876         /* Using hardware flow control? */
 877         if (tty->termios->c_cflag & CRTSCTS) {
 878                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 879
 880                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 881                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 882         }
 883         ircomm_flow_request(self->ircomm, FLOW_START);
 884 }
 885
 886 /*
 887  * Function ircomm_tty_chars_in_buffer (tty)
 888  *
 889  *    Indicates if there are any data in the buffer
 890  *
 891  */
 892 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 893 {
 894         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 895         unsigned long flags;
 896         int len = 0;
 897
 898         IRDA_ASSERT(self != NULL, return -1;);
 899         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 900
 901         spin_lock_irqsave(&self->spinlock, flags);
 902
 903         if (self->tx_skb)
 904                 len = self->tx_skb->len;
 905
 906         spin_unlock_irqrestore(&self->spinlock, flags);
 907
 908         return len;
 909 }
 910
 911 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 912 {
 913         unsigned long flags;
 914
 915         IRDA_ASSERT(self != NULL, return;);
 916         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 917
 918         IRDA_DEBUG(0, "%s()\n", __func__ );
 919
 920         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
 921                 return;
 922
 923         ircomm_tty_detach_cable(self);
 924
 925         spin_lock_irqsave(&self->spinlock, flags);
 926
 927         del_timer(&self->watchdog_timer);
 928
 929         /* Free parameter buffer */
 930         if (self->ctrl_skb) {
 931                 dev_kfree_skb(self->ctrl_skb);
 932                 self->ctrl_skb = NULL;
 933         }
 934
 935         /* Free transmit buffer */
 936         if (self->tx_skb) {
 937                 dev_kfree_skb(self->tx_skb);
 938                 self->tx_skb = NULL;
 939         }
 940
 941         if (self->ircomm) {
 942                 ircomm_close(self->ircomm);
 943                 self->ircomm = NULL;
 944         }
 945
 946         spin_unlock_irqrestore(&self->spinlock, flags);
 947 }
 948
 949 /*
 950  * Function ircomm_tty_hangup (tty)
 951  *
 952  *    This routine notifies the tty driver that it should hangup the tty
 953  *    device.
 954  *
 955  */
 956 static void ircomm_tty_hangup(struct tty_struct *tty)
 957 {
 958         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 959         struct tty_port *port = &self->port;
 960         unsigned long   flags;
 961
 962         IRDA_DEBUG(0, "%s()\n", __func__ );
 963
 964         IRDA_ASSERT(self != NULL, return;);
 965         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 966
 967         /* ircomm_tty_flush_buffer(tty); */
 968         ircomm_tty_shutdown(self);
 969
 970         spin_lock_irqsave(&port->lock, flags);
 971         port->flags &= ~ASYNC_NORMAL_ACTIVE;
 972         if (port->tty) {
 973                 set_bit(TTY_IO_ERROR, &port->tty->flags);
 974                 tty_kref_put(port->tty);
 975         }
 976         port->tty = NULL;
 977         port->count = 0;
 978         spin_unlock_irqrestore(&port->lock, flags);
 979
 980         wake_up_interruptible(&port->open_wait);
 981 }
 982
 983 /*
 984  * Function ircomm_tty_send_xchar (tty, ch)
 985  *
 986  *    This routine is used to send a high-priority XON/XOFF character to
 987  *    the device.
 988  */
 989 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
 990 {
 991         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
 992 }
 993
 994 /*
 995  * Function ircomm_tty_start (tty)
 996  *
 997  *    This routine notifies the tty driver that it resume sending
 998  *    characters to the tty device.
 999  */
1000 void ircomm_tty_start(struct tty_struct *tty)
1001 {
1002         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1003
1004         ircomm_flow_request(self->ircomm, FLOW_START);
1005 }
1006
1007 /*
1008  * Function ircomm_tty_stop (tty)
1009  *
1010  *     This routine notifies the tty driver that it should stop outputting
1011  *     characters to the tty device.
1012  */
1013 static void ircomm_tty_stop(struct tty_struct *tty)
1014 {
1015         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1016
1017         IRDA_ASSERT(self != NULL, return;);
1018         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1019
1020         ircomm_flow_request(self->ircomm, FLOW_STOP);
1021 }
1022
1023 /*
1024  * Function ircomm_check_modem_status (self)
1025  *
1026  *    Check for any changes in the DCE's line settings. This function should
1027  *    be called whenever the dce parameter settings changes, to update the
1028  *    flow control settings and other things
1029  */
1030 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1031 {
1032         struct tty_struct *tty;
1033         int status;
1034
1035         IRDA_DEBUG(0, "%s()\n", __func__ );
1036
1037         IRDA_ASSERT(self != NULL, return;);
1038         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1039
1040         tty = tty_port_tty_get(&self->port);
1041
1042         status = self->settings.dce;
1043
1044         if (status & IRCOMM_DCE_DELTA_ANY) {
1045                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1046         }
1047         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1048                 IRDA_DEBUG(2,
1049                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1050                            (status & IRCOMM_CD) ? "on" : "off");
1051
1052                 if (status & IRCOMM_CD) {
1053                         wake_up_interruptible(&self->port.open_wait);
1054                 } else {
1055                         IRDA_DEBUG(2,
1056                                    "%s(), Doing serial hangup..\n", __func__ );
1057                         if (tty)
1058                                 tty_hangup(tty);
1059
1060                         /* Hangup will remote the tty, so better break out */
1061                         goto put;
1062                 }
1063         }
1064         if (tty && self->port.flags & ASYNC_CTS_FLOW) {
1065                 if (tty->hw_stopped) {
1066                         if (status & IRCOMM_CTS) {
1067                                 IRDA_DEBUG(2,
1068                                            "%s(), CTS tx start...\n", __func__ );
1069                                 tty->hw_stopped = 0;
1070
1071                                 /* Wake up processes blocked on open */
1072                                 wake_up_interruptible(&self->port.open_wait);
1073
1074                                 schedule_work(&self->tqueue);
1075                                 goto put;
1076                         }
1077                 } else {
1078                         if (!(status & IRCOMM_CTS)) {
1079                                 IRDA_DEBUG(2,
1080                                            "%s(), CTS tx stop...\n", __func__ );
1081                                 tty->hw_stopped = 1;
1082                         }
1083                 }
1084         }
1085 put:
1086         tty_kref_put(tty);
1087 }
1088
1089 /*
1090  * Function ircomm_tty_data_indication (instance, sap, skb)
1091  *
1092  *    Handle incoming data, and deliver it to the line discipline
1093  *
1094  */
1095 static int ircomm_tty_data_indication(void *instance, void *sap,
1096                                       struct sk_buff *skb)
1097 {
1098         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1099         struct tty_struct *tty;
1100
1101         IRDA_DEBUG(2, "%s()\n", __func__ );
1102
1103         IRDA_ASSERT(self != NULL, return -1;);
1104         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1105         IRDA_ASSERT(skb != NULL, return -1;);
1106
1107         tty = tty_port_tty_get(&self->port);
1108         if (!tty) {
1109                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1110                 return 0;
1111         }
1112
1113         /*
1114          * If we receive data when hardware is stopped then something is wrong.
1115          * We try to poll the peers line settings to check if we are up todate.
1116          * Devices like WinCE can do this, and since they don't send any
1117          * params, we can just as well declare the hardware for running.
1118          */
1119         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1120                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1121                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1122
1123                 /* We can just as well declare the hardware for running */
1124                 ircomm_tty_send_initial_parameters(self);
1125                 ircomm_tty_link_established(self);
1126         }
1127
1128         /*
1129          * Use flip buffer functions since the code may be called from interrupt
1130          * context
1131          */
1132         tty_insert_flip_string(tty, skb->data, skb->len);
1133         tty_flip_buffer_push(tty);
1134         tty_kref_put(tty);
1135
1136         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1137
1138         return 0;
1139 }
1140
1141 /*
1142  * Function ircomm_tty_control_indication (instance, sap, skb)
1143  *
1144  *    Parse all incoming parameters (easy!)
1145  *
1146  */
1147 static int ircomm_tty_control_indication(void *instance, void *sap,
1148                                          struct sk_buff *skb)
1149 {
1150         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1151         int clen;
1152
1153         IRDA_DEBUG(4, "%s()\n", __func__ );
1154
1155         IRDA_ASSERT(self != NULL, return -1;);
1156         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1157         IRDA_ASSERT(skb != NULL, return -1;);
1158
1159         clen = skb->data[0];
1160
1161         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1162                                &ircomm_param_info);
1163
1164         /* No need to kfree_skb - see ircomm_control_indication() */
1165
1166         return 0;
1167 }
1168
1169 /*
1170  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1171  *
1172  *    This function is called by IrTTP when it wants us to slow down the
1173  *    transmission of data. We just mark the hardware as stopped, and wait
1174  *    for IrTTP to notify us that things are OK again.
1175  */
1176 static void ircomm_tty_flow_indication(void *instance, void *sap,
1177                                        LOCAL_FLOW cmd)
1178 {
1179         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1180         struct tty_struct *tty;
1181
1182         IRDA_ASSERT(self != NULL, return;);
1183         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1184
1185         tty = tty_port_tty_get(&self->port);
1186
1187         switch (cmd) {
1188         case FLOW_START:
1189                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1190                 if (tty)
1191                         tty->hw_stopped = 0;
1192
1193                 /* ircomm_tty_do_softint will take care of the rest */
1194                 schedule_work(&self->tqueue);
1195                 break;
1196         default:  /* If we get here, something is very wrong, better stop */
1197         case FLOW_STOP:
1198                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1199                 if (tty)
1200                         tty->hw_stopped = 1;
1201                 break;
1202         }
1203
1204         tty_kref_put(tty);
1205         self->flow = cmd;
1206 }
1207
1208 #ifdef CONFIG_PROC_FS
1209 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1210 {
1211         struct tty_struct *tty;
1212         char sep;
1213
1214         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1215
1216         seq_puts(m, "Service type: ");
1217         if (self->service_type & IRCOMM_9_WIRE)
1218                 seq_puts(m, "9_WIRE");
1219         else if (self->service_type & IRCOMM_3_WIRE)
1220                 seq_puts(m, "3_WIRE");
1221         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1222                 seq_puts(m, "3_WIRE_RAW");
1223         else
1224                 seq_puts(m, "No common service type!\n");
1225         seq_putc(m, '\n');
1226
1227         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1228
1229         seq_printf(m, "DTE status:");
1230         sep = ' ';
1231         if (self->settings.dte & IRCOMM_RTS) {
1232                 seq_printf(m, "%cRTS", sep);
1233                 sep = '|';
1234         }
1235         if (self->settings.dte & IRCOMM_DTR) {
1236                 seq_printf(m, "%cDTR", sep);
1237                 sep = '|';
1238         }
1239         seq_putc(m, '\n');
1240
1241         seq_puts(m, "DCE status:");
1242         sep = ' ';
1243         if (self->settings.dce & IRCOMM_CTS) {
1244                 seq_printf(m, "%cCTS", sep);
1245                 sep = '|';
1246         }
1247         if (self->settings.dce & IRCOMM_DSR) {
1248                 seq_printf(m, "%cDSR", sep);
1249                 sep = '|';
1250         }
1251         if (self->settings.dce & IRCOMM_CD) {
1252                 seq_printf(m, "%cCD", sep);
1253                 sep = '|';
1254         }
1255         if (self->settings.dce & IRCOMM_RI) {
1256                 seq_printf(m, "%cRI", sep);
1257                 sep = '|';
1258         }
1259         seq_putc(m, '\n');
1260
1261         seq_puts(m, "Configuration: ");
1262         if (!self->settings.null_modem)
1263                 seq_puts(m, "DTE <-> DCE\n");
1264         else
1265                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1266
1267         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1268
1269         seq_puts(m, "Flow control:");
1270         sep = ' ';
1271         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1272                 seq_printf(m, "%cXON_XOFF_IN", sep);
1273                 sep = '|';
1274         }
1275         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1276                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1277                 sep = '|';
1278         }
1279         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1280                 seq_printf(m, "%cRTS_CTS_IN", sep);
1281                 sep = '|';
1282         }
1283         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1284                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1285                 sep = '|';
1286         }
1287         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1288                 seq_printf(m, "%cDSR_DTR_IN", sep);
1289                 sep = '|';
1290         }
1291         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1292                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1293                 sep = '|';
1294         }
1295         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1296                 seq_printf(m, "%cENQ_ACK_IN", sep);
1297                 sep = '|';
1298         }
1299         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1300                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1301                 sep = '|';
1302         }
1303         seq_putc(m, '\n');
1304
1305         seq_puts(m, "Flags:");
1306         sep = ' ';
1307         if (self->port.flags & ASYNC_CTS_FLOW) {
1308                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1309                 sep = '|';
1310         }
1311         if (self->port.flags & ASYNC_CHECK_CD) {
1312                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1313                 sep = '|';
1314         }
1315         if (self->port.flags & ASYNC_INITIALIZED) {
1316                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1317                 sep = '|';
1318         }
1319         if (self->port.flags & ASYNC_LOW_LATENCY) {
1320                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1321                 sep = '|';
1322         }
1323         if (self->port.flags & ASYNC_CLOSING) {
1324                 seq_printf(m, "%cASYNC_CLOSING", sep);
1325                 sep = '|';
1326         }
1327         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1328                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1329                 sep = '|';
1330         }
1331         seq_putc(m, '\n');
1332
1333         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1334         seq_printf(m, "Open count: %d\n", self->port.count);
1335         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1336         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1337
1338         tty = tty_port_tty_get(&self->port);
1339         if (tty) {
1340                 seq_printf(m, "Hardware: %s\n",
1341                                tty->hw_stopped ? "Stopped" : "Running");
1342                 tty_kref_put(tty);
1343         }
1344 }
1345
1346 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1347 {
1348         struct ircomm_tty_cb *self;
1349         unsigned long flags;
1350
1351         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1352
1353         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1354         while (self != NULL) {
1355                 if (self->magic != IRCOMM_TTY_MAGIC)
1356                         break;
1357
1358                 ircomm_tty_line_info(self, m);
1359                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1360         }
1361         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1362         return 0;
1363 }
1364
1365 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1366 {
1367         return single_open(file, ircomm_tty_proc_show, NULL);
1368 }
1369
1370 static const struct file_operations ircomm_tty_proc_fops = {
1371         .owner          = THIS_MODULE,
1372         .open           = ircomm_tty_proc_open,
1373         .read           = seq_read,
1374         .llseek         = seq_lseek,
1375         .release        = single_release,
1376 };
1377 #endif /* CONFIG_PROC_FS */
1378
1379 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1380 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1381 MODULE_LICENSE("GPL");
1382 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1383
1384 module_init(ircomm_tty_init);
1385 module_exit(ircomm_tty_cleanup);