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