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_install(struct tty_driver *driver,
  56                 struct tty_struct *tty);
  57 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  58 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  59 static int  ircomm_tty_write(struct tty_struct * tty,
  60                              const unsigned char *buf, int count);
  61 static int  ircomm_tty_write_room(struct tty_struct *tty);
  62 static void ircomm_tty_throttle(struct tty_struct *tty);
  63 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  64 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  65 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  66 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  67 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  68 static void ircomm_tty_hangup(struct tty_struct *tty);
  69 static void ircomm_tty_do_softint(struct work_struct *work);
  70 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  71 static void ircomm_tty_stop(struct tty_struct *tty);
  72
  73 static int ircomm_tty_data_indication(void *instance, void *sap,
  74                                       struct sk_buff *skb);
  75 static int ircomm_tty_control_indication(void *instance, void *sap,
  76                                          struct sk_buff *skb);
  77 static void ircomm_tty_flow_indication(void *instance, void *sap,
  78                                        LOCAL_FLOW cmd);
  79 #ifdef CONFIG_PROC_FS
  80 static const struct file_operations ircomm_tty_proc_fops;
  81 #endif /* CONFIG_PROC_FS */
  82 static struct tty_driver *driver;
  83
  84 static hashbin_t *ircomm_tty = NULL;
  85
  86 static const struct tty_operations ops = {
  87         .install         = ircomm_tty_install,
  88         .open            = ircomm_tty_open,
  89         .close           = ircomm_tty_close,
  90         .write           = ircomm_tty_write,
  91         .write_room      = ircomm_tty_write_room,
  92         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  93         .flush_buffer    = ircomm_tty_flush_buffer,
  94         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  95         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  96         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  97         .throttle        = ircomm_tty_throttle,
  98         .unthrottle      = ircomm_tty_unthrottle,
  99         .send_xchar      = ircomm_tty_send_xchar,
 100         .set_termios     = ircomm_tty_set_termios,
 101         .stop            = ircomm_tty_stop,
 102         .start           = ircomm_tty_start,
 103         .hangup          = ircomm_tty_hangup,
 104         .wait_until_sent = ircomm_tty_wait_until_sent,
 105 #ifdef CONFIG_PROC_FS
 106         .proc_fops       = &ircomm_tty_proc_fops,
 107 #endif /* CONFIG_PROC_FS */
 108 };
 109
 110 static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
 111 {
 112         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 113                         port);
 114         /*
 115          * Here, we use to lock those two guys, but as ircomm_param_request()
 116          * does it itself, I don't see the point (and I see the deadlock).
 117          * Jean II
 118          */
 119         if (raise)
 120                 self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
 121         else
 122                 self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
 123
 124         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 125 }
 126
 127 static int ircomm_port_carrier_raised(struct tty_port *port)
 128 {
 129         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 130                         port);
 131         return self->settings.dce & IRCOMM_CD;
 132 }
 133
 134 static const struct tty_port_operations ircomm_port_ops = {
 135         .dtr_rts = ircomm_port_raise_dtr_rts,
 136         .carrier_raised = ircomm_port_carrier_raised,
 137 };
 138
 139 /*
 140  * Function ircomm_tty_init()
 141  *
 142  *    Init IrCOMM TTY layer/driver
 143  *
 144  */
 145 static int __init ircomm_tty_init(void)
 146 {
 147         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 148         if (!driver)
 149                 return -ENOMEM;
 150         ircomm_tty = hashbin_new(HB_LOCK);
 151         if (ircomm_tty == NULL) {
 152                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 153                 put_tty_driver(driver);
 154                 return -ENOMEM;
 155         }
 156
 157         driver->driver_name     = "ircomm";
 158         driver->name            = "ircomm";
 159         driver->major           = IRCOMM_TTY_MAJOR;
 160         driver->minor_start     = IRCOMM_TTY_MINOR;
 161         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 162         driver->subtype         = SERIAL_TYPE_NORMAL;
 163         driver->init_termios    = tty_std_termios;
 164         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 165         driver->flags           = TTY_DRIVER_REAL_RAW;
 166         tty_set_operations(driver, &ops);
 167         if (tty_register_driver(driver)) {
 168                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 169                            __func__);
 170                 put_tty_driver(driver);
 171                 return -1;
 172         }
 173         return 0;
 174 }
 175
 176 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 177 {
 178         IRDA_DEBUG(0, "%s()\n", __func__ );
 179
 180         IRDA_ASSERT(self != NULL, return;);
 181         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 182
 183         ircomm_tty_shutdown(self);
 184
 185         self->magic = 0;
 186         tty_port_destroy(&self->port);
 187         kfree(self);
 188 }
 189
 190 /*
 191  * Function ircomm_tty_cleanup ()
 192  *
 193  *    Remove IrCOMM TTY layer/driver
 194  *
 195  */
 196 static void __exit ircomm_tty_cleanup(void)
 197 {
 198         int ret;
 199
 200         IRDA_DEBUG(4, "%s()\n", __func__ );
 201
 202         ret = tty_unregister_driver(driver);
 203         if (ret) {
 204                 IRDA_ERROR("%s(), failed to unregister driver\n",
 205                            __func__);
 206                 return;
 207         }
 208
 209         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 210         put_tty_driver(driver);
 211 }
 212
 213 /*
 214  * Function ircomm_startup (self)
 215  *
 216  *
 217  *
 218  */
 219 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 220 {
 221         notify_t notify;
 222         int ret = -ENODEV;
 223
 224         IRDA_DEBUG(2, "%s()\n", __func__ );
 225
 226         IRDA_ASSERT(self != NULL, return -1;);
 227         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 228
 229         /* Check if already open */
 230         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
 231                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 232                 return 0;
 233         }
 234
 235         /* Register with IrCOMM */
 236         irda_notify_init(&notify);
 237         /* These callbacks we must handle ourselves */
 238         notify.data_indication       = ircomm_tty_data_indication;
 239         notify.udata_indication      = ircomm_tty_control_indication;
 240         notify.flow_indication       = ircomm_tty_flow_indication;
 241
 242         /* Use the ircomm_tty interface for these ones */
 243         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 244         notify.connect_confirm       = ircomm_tty_connect_confirm;
 245         notify.connect_indication    = ircomm_tty_connect_indication;
 246         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 247         notify.instance = self;
 248
 249         if (!self->ircomm) {
 250                 self->ircomm = ircomm_open(&notify, self->service_type,
 251                                            self->line);
 252         }
 253         if (!self->ircomm)
 254                 goto err;
 255
 256         self->slsap_sel = self->ircomm->slsap_sel;
 257
 258         /* Connect IrCOMM link with remote device */
 259         ret = ircomm_tty_attach_cable(self);
 260         if (ret < 0) {
 261                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 262                 goto err;
 263         }
 264
 265         return 0;
 266 err:
 267         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
 268         return ret;
 269 }
 270
 271 /*
 272  * Function ircomm_block_til_ready (self, filp)
 273  *
 274  *
 275  *
 276  */
 277 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 278                 struct tty_struct *tty, struct file *filp)
 279 {
 280         struct tty_port *port = &self->port;
 281         DECLARE_WAITQUEUE(wait, current);
 282         int             retval;
 283         int             do_clocal = 0;
 284         unsigned long   flags;
 285
 286         IRDA_DEBUG(2, "%s()\n", __func__ );
 287
 288         /*
 289          * If non-blocking mode is set, or the port is not enabled,
 290          * then make the check up front and then exit.
 291          */
 292         if (test_bit(TTY_IO_ERROR, &tty->flags)) {
 293                 port->flags |= ASYNC_NORMAL_ACTIVE;
 294                 return 0;
 295         }
 296
 297         if (filp->f_flags & O_NONBLOCK) {
 298                 /* nonblock mode is set */
 299                 if (tty->termios.c_cflag & CBAUD)
 300                         tty_port_raise_dtr_rts(port);
 301                 port->flags |= ASYNC_NORMAL_ACTIVE;
 302                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 303                 return 0;
 304         }
 305
 306         if (tty->termios.c_cflag & CLOCAL) {
 307                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 308                 do_clocal = 1;
 309         }
 310
 311         /* Wait for carrier detect and the line to become
 312          * free (i.e., not in use by the callout).  While we are in
 313          * this loop, port->count is dropped by one, so that
 314          * mgsl_close() knows when to free things.  We restore it upon
 315          * exit, either normal or abnormal.
 316          */
 317
 318         retval = 0;
 319         add_wait_queue(&port->open_wait, &wait);
 320
 321         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 322               __FILE__, __LINE__, tty->driver->name, port->count);
 323
 324         spin_lock_irqsave(&port->lock, flags);
 325         if (!tty_hung_up_p(filp))
 326                 port->count--;
 327         port->blocked_open++;
 328         spin_unlock_irqrestore(&port->lock, flags);
 329
 330         while (1) {
 331                 if (tty->termios.c_cflag & CBAUD)
 332                         tty_port_raise_dtr_rts(port);
 333
 334                 set_current_state(TASK_INTERRUPTIBLE);
 335
 336                 if (tty_hung_up_p(filp) ||
 337                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 338                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
 339                                         -EAGAIN : -ERESTARTSYS;
 340                         break;
 341                 }
 342
 343                 /*
 344                  * Check if link is ready now. Even if CLOCAL is
 345                  * specified, we cannot return before the IrCOMM link is
 346                  * ready
 347                  */
 348                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
 349                     (do_clocal || tty_port_carrier_raised(port)) &&
 350                     self->state == IRCOMM_TTY_READY)
 351                 {
 352                         break;
 353                 }
 354
 355                 if (signal_pending(current)) {
 356                         retval = -ERESTARTSYS;
 357                         break;
 358                 }
 359
 360                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 361                       __FILE__, __LINE__, tty->driver->name, port->count);
 362
 363                 schedule();
 364         }
 365
 366         __set_current_state(TASK_RUNNING);
 367         remove_wait_queue(&port->open_wait, &wait);
 368
 369         spin_lock_irqsave(&port->lock, flags);
 370         if (!tty_hung_up_p(filp))
 371                 port->count++;
 372         port->blocked_open--;
 373         spin_unlock_irqrestore(&port->lock, flags);
 374
 375         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 376               __FILE__, __LINE__, tty->driver->name, port->count);
 377
 378         if (!retval)
 379                 port->flags |= ASYNC_NORMAL_ACTIVE;
 380
 381         return retval;
 382 }
 383
 384
 385 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 386 {
 387         struct ircomm_tty_cb *self;
 388         unsigned int line = tty->index;
 389
 390         /* Check if instance already exists */
 391         self = hashbin_lock_find(ircomm_tty, line, NULL);
 392         if (!self) {
 393                 /* No, so make new instance */
 394                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 395                 if (self == NULL) {
 396                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 397                         return -ENOMEM;
 398                 }
 399
 400                 tty_port_init(&self->port);
 401                 self->port.ops = &ircomm_port_ops;
 402                 self->magic = IRCOMM_TTY_MAGIC;
 403                 self->flow = FLOW_STOP;
 404
 405                 self->line = line;
 406                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 407                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 408                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 409
 410                 /* Init some important stuff */
 411                 init_timer(&self->watchdog_timer);
 412                 spin_lock_init(&self->spinlock);
 413
 414                 /*
 415                  * Force TTY into raw mode by default which is usually what
 416                  * we want for IrCOMM and IrLPT. This way applications will
 417                  * not have to twiddle with printcap etc.
 418                  *
 419                  * Note this is completely usafe and doesn't work properly
 420                  */
 421                 tty->termios.c_iflag = 0;
 422                 tty->termios.c_oflag = 0;
 423
 424                 /* Insert into hash */
 425                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 426         }
 427
 428         tty->driver_data = self;
 429
 430         return tty_port_install(&self->port, driver, tty);
 431 }
 432
 433 /*
 434  * Function ircomm_tty_open (tty, filp)
 435  *
 436  *    This routine is called when a particular tty device is opened. This
 437  *    routine is mandatory; if this routine is not filled in, the attempted
 438  *    open will fail with ENODEV.
 439  */
 440 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 441 {
 442         struct ircomm_tty_cb *self = tty->driver_data;
 443         unsigned long   flags;
 444         int ret;
 445
 446         IRDA_DEBUG(2, "%s()\n", __func__ );
 447
 448         /* ++ is not atomic, so this should be protected - Jean II */
 449         spin_lock_irqsave(&self->port.lock, flags);
 450         self->port.count++;
 451         spin_unlock_irqrestore(&self->port.lock, flags);
 452         tty_port_tty_set(&self->port, tty);
 453
 454         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 455                    self->line, self->port.count);
 456
 457         /* Not really used by us, but lets do it anyway */
 458         self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 459
 460         /*
 461          * If the port is the middle of closing, bail out now
 462          */
 463         if (tty_hung_up_p(filp) ||
 464             test_bit(ASYNCB_CLOSING, &self->port.flags)) {
 465
 466                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 467                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 468                  * IMHO it's either not needed in the first place
 469                  * or for some reason we need to make sure the async
 470                  * closing has been finished - if so, wouldn't we
 471                  * probably better sleep uninterruptible?
 472                  */
 473
 474                 if (wait_event_interruptible(self->port.close_wait,
 475                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
 476                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 477                                      __func__);
 478                         return -ERESTARTSYS;
 479                 }
 480
 481 #ifdef SERIAL_DO_RESTART
 482                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
 483                         -EAGAIN : -ERESTARTSYS;
 484 #else
 485                 return -EAGAIN;
 486 #endif
 487         }
 488
 489         /* Check if this is a "normal" ircomm device, or an irlpt device */
 490         if (self->line < 0x10) {
 491                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 492                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 493                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 494                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 495                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 496         } else {
 497                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 498                 self->service_type = IRCOMM_3_WIRE_RAW;
 499                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 500         }
 501
 502         ret = ircomm_tty_startup(self);
 503         if (ret)
 504                 return ret;
 505
 506         ret = ircomm_tty_block_til_ready(self, tty, filp);
 507         if (ret) {
 508                 IRDA_DEBUG(2,
 509                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 510                       ret);
 511
 512                 return ret;
 513         }
 514         return 0;
 515 }
 516
 517 /*
 518  * Function ircomm_tty_close (tty, filp)
 519  *
 520  *    This routine is called when a particular tty device is closed.
 521  *
 522  */
 523 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 524 {
 525         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 526         struct tty_port *port = &self->port;
 527
 528         IRDA_DEBUG(0, "%s()\n", __func__ );
 529
 530         IRDA_ASSERT(self != NULL, return;);
 531         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 532
 533         if (tty_port_close_start(port, tty, filp) == 0)
 534                 return;
 535
 536         ircomm_tty_shutdown(self);
 537
 538         tty_driver_flush_buffer(tty);
 539
 540         tty_port_close_end(port, tty);
 541         tty_port_tty_set(port, NULL);
 542 }
 543
 544 /*
 545  * Function ircomm_tty_flush_buffer (tty)
 546  *
 547  *
 548  *
 549  */
 550 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 551 {
 552         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 553
 554         IRDA_ASSERT(self != NULL, return;);
 555         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 556
 557         /*
 558          * Let do_softint() do this to avoid race condition with
 559          * do_softint() ;-)
 560          */
 561         schedule_work(&self->tqueue);
 562 }
 563
 564 /*
 565  * Function ircomm_tty_do_softint (work)
 566  *
 567  *    We use this routine to give the write wakeup to the user at at a
 568  *    safe time (as fast as possible after write have completed). This
 569  *    can be compared to the Tx interrupt.
 570  */
 571 static void ircomm_tty_do_softint(struct work_struct *work)
 572 {
 573         struct ircomm_tty_cb *self =
 574                 container_of(work, struct ircomm_tty_cb, tqueue);
 575         struct tty_struct *tty;
 576         unsigned long flags;
 577         struct sk_buff *skb, *ctrl_skb;
 578
 579         IRDA_DEBUG(2, "%s()\n", __func__ );
 580
 581         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 582                 return;
 583
 584         tty = tty_port_tty_get(&self->port);
 585         if (!tty)
 586                 return;
 587
 588         /* Unlink control buffer */
 589         spin_lock_irqsave(&self->spinlock, flags);
 590
 591         ctrl_skb = self->ctrl_skb;
 592         self->ctrl_skb = NULL;
 593
 594         spin_unlock_irqrestore(&self->spinlock, flags);
 595
 596         /* Flush control buffer if any */
 597         if(ctrl_skb) {
 598                 if(self->flow == FLOW_START)
 599                         ircomm_control_request(self->ircomm, ctrl_skb);
 600                 /* Drop reference count - see ircomm_ttp_data_request(). */
 601                 dev_kfree_skb(ctrl_skb);
 602         }
 603
 604         if (tty->hw_stopped)
 605                 goto put;
 606
 607         /* Unlink transmit buffer */
 608         spin_lock_irqsave(&self->spinlock, flags);
 609
 610         skb = self->tx_skb;
 611         self->tx_skb = NULL;
 612
 613         spin_unlock_irqrestore(&self->spinlock, flags);
 614
 615         /* Flush transmit buffer if any */
 616         if (skb) {
 617                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 618                 /* Drop reference count - see ircomm_ttp_data_request(). */
 619                 dev_kfree_skb(skb);
 620         }
 621
 622         /* Check if user (still) wants to be waken up */
 623         tty_wakeup(tty);
 624 put:
 625         tty_kref_put(tty);
 626 }
 627
 628 /*
 629  * Function ircomm_tty_write (tty, buf, count)
 630  *
 631  *    This routine is called by the kernel to write a series of characters
 632  *    to the tty device. The characters may come from user space or kernel
 633  *    space. This routine will return the number of characters actually
 634  *    accepted for writing. This routine is mandatory.
 635  */
 636 static int ircomm_tty_write(struct tty_struct *tty,
 637                             const unsigned char *buf, int count)
 638 {
 639         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 640         unsigned long flags;
 641         struct sk_buff *skb;
 642         int tailroom = 0;
 643         int len = 0;
 644         int size;
 645
 646         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 647                    tty->hw_stopped);
 648
 649         IRDA_ASSERT(self != NULL, return -1;);
 650         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 651
 652         /* We may receive packets from the TTY even before we have finished
 653          * our setup. Not cool.
 654          * The problem is that we don't know the final header and data size
 655          * to create the proper skb, so any skb we would create would have
 656          * bogus header and data size, so need care.
 657          * We use a bogus header size to safely detect this condition.
 658          * Another problem is that hw_stopped was set to 0 way before it
 659          * should be, so we would drop this skb. It should now be fixed.
 660          * One option is to not accept data until we are properly setup.
 661          * But, I suspect that when it happens, the ppp line discipline
 662          * just "drops" the data, which might screw up connect scripts.
 663          * The second option is to create a "safe skb", with large header
 664          * and small size (see ircomm_tty_open() for values).
 665          * We just need to make sure that when the real values get filled,
 666          * we don't mess up the original "safe skb" (see tx_data_size).
 667          * Jean II */
 668         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 669                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 670 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 671                 /* We didn't consume anything, TTY will retry */
 672                 return 0;
 673 #endif
 674         }
 675
 676         if (count < 1)
 677                 return 0;
 678
 679         /* Protect our manipulation of self->tx_skb and related */
 680         spin_lock_irqsave(&self->spinlock, flags);
 681
 682         /* Fetch current transmit buffer */
 683         skb = self->tx_skb;
 684
 685         /*
 686          * Send out all the data we get, possibly as multiple fragmented
 687          * frames, but this will only happen if the data is larger than the
 688          * max data size. The normal case however is just the opposite, and
 689          * this function may be called multiple times, and will then actually
 690          * defragment the data and send it out as one packet as soon as
 691          * possible, but at a safer point in time
 692          */
 693         while (count) {
 694                 size = count;
 695
 696                 /* Adjust data size to the max data size */
 697                 if (size > self->max_data_size)
 698                         size = self->max_data_size;
 699
 700                 /*
 701                  * Do we already have a buffer ready for transmit, or do
 702                  * we need to allocate a new frame
 703                  */
 704                 if (skb) {
 705                         /*
 706                          * Any room for more data at the end of the current
 707                          * transmit buffer? Cannot use skb_tailroom, since
 708                          * dev_alloc_skb gives us a larger skb than we
 709                          * requested
 710                          * Note : use tx_data_size, because max_data_size
 711                          * may have changed and we don't want to overwrite
 712                          * the skb. - Jean II
 713                          */
 714                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 715                                 /* Adjust data to tailroom */
 716                                 if (size > tailroom)
 717                                         size = tailroom;
 718                         } else {
 719                                 /*
 720                                  * Current transmit frame is full, so break
 721                                  * out, so we can send it as soon as possible
 722                                  */
 723                                 break;
 724                         }
 725                 } else {
 726                         /* Prepare a full sized frame */
 727                         skb = alloc_skb(self->max_data_size+
 728                                         self->max_header_size,
 729                                         GFP_ATOMIC);
 730                         if (!skb) {
 731                                 spin_unlock_irqrestore(&self->spinlock, flags);
 732                                 return -ENOBUFS;
 733                         }
 734                         skb_reserve(skb, self->max_header_size);
 735                         self->tx_skb = skb;
 736                         /* Remember skb size because max_data_size may
 737                          * change later on - Jean II */
 738                         self->tx_data_size = self->max_data_size;
 739                 }
 740
 741                 /* Copy data */
 742                 memcpy(skb_put(skb,size), buf + len, size);
 743
 744                 count -= size;
 745                 len += size;
 746         }
 747
 748         spin_unlock_irqrestore(&self->spinlock, flags);
 749
 750         /*
 751          * Schedule a new thread which will transmit the frame as soon
 752          * as possible, but at a safe point in time. We do this so the
 753          * "user" can give us data multiple times, as PPP does (because of
 754          * its 256 byte tx buffer). We will then defragment and send out
 755          * all this data as one single packet.
 756          */
 757         schedule_work(&self->tqueue);
 758
 759         return len;
 760 }
 761
 762 /*
 763  * Function ircomm_tty_write_room (tty)
 764  *
 765  *    This routine returns the numbers of characters the tty driver will
 766  *    accept for queuing to be written. This number is subject to change as
 767  *    output buffers get emptied, or if the output flow control is acted.
 768  */
 769 static int ircomm_tty_write_room(struct tty_struct *tty)
 770 {
 771         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 772         unsigned long flags;
 773         int ret;
 774
 775         IRDA_ASSERT(self != NULL, return -1;);
 776         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 777
 778 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 779         /* max_header_size tells us if the channel is initialised or not. */
 780         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 781                 /* Don't bother us yet */
 782                 return 0;
 783 #endif
 784
 785         /* Check if we are allowed to transmit any data.
 786          * hw_stopped is the regular flow control.
 787          * Jean II */
 788         if (tty->hw_stopped)
 789                 ret = 0;
 790         else {
 791                 spin_lock_irqsave(&self->spinlock, flags);
 792                 if (self->tx_skb)
 793                         ret = self->tx_data_size - self->tx_skb->len;
 794                 else
 795                         ret = self->max_data_size;
 796                 spin_unlock_irqrestore(&self->spinlock, flags);
 797         }
 798         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 799
 800         return ret;
 801 }
 802
 803 /*
 804  * Function ircomm_tty_wait_until_sent (tty, timeout)
 805  *
 806  *    This routine waits until the device has written out all of the
 807  *    characters in its transmitter FIFO.
 808  */
 809 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 810 {
 811         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 812         unsigned long orig_jiffies, poll_time;
 813         unsigned long flags;
 814
 815         IRDA_DEBUG(2, "%s()\n", __func__ );
 816
 817         IRDA_ASSERT(self != NULL, return;);
 818         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 819
 820         orig_jiffies = jiffies;
 821
 822         /* Set poll time to 200 ms */
 823         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 824
 825         spin_lock_irqsave(&self->spinlock, flags);
 826         while (self->tx_skb && self->tx_skb->len) {
 827                 spin_unlock_irqrestore(&self->spinlock, flags);
 828                 schedule_timeout_interruptible(poll_time);
 829                 spin_lock_irqsave(&self->spinlock, flags);
 830                 if (signal_pending(current))
 831                         break;
 832                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 833                         break;
 834         }
 835         spin_unlock_irqrestore(&self->spinlock, flags);
 836         current->state = TASK_RUNNING;
 837 }
 838
 839 /*
 840  * Function ircomm_tty_throttle (tty)
 841  *
 842  *    This routine notifies the tty driver that input buffers for the line
 843  *    discipline are close to full, and it should somehow signal that no
 844  *    more characters should be sent to the tty.
 845  */
 846 static void ircomm_tty_throttle(struct tty_struct *tty)
 847 {
 848         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 849
 850         IRDA_DEBUG(2, "%s()\n", __func__ );
 851
 852         IRDA_ASSERT(self != NULL, return;);
 853         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 854
 855         /* Software flow control? */
 856         if (I_IXOFF(tty))
 857                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 858
 859         /* Hardware flow control? */
 860         if (tty->termios.c_cflag & CRTSCTS) {
 861                 self->settings.dte &= ~IRCOMM_RTS;
 862                 self->settings.dte |= IRCOMM_DELTA_RTS;
 863
 864                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 865         }
 866
 867         ircomm_flow_request(self->ircomm, FLOW_STOP);
 868 }
 869
 870 /*
 871  * Function ircomm_tty_unthrottle (tty)
 872  *
 873  *    This routine notifies the tty drivers that it should signals that
 874  *    characters can now be sent to the tty without fear of overrunning the
 875  *    input buffers of the line disciplines.
 876  */
 877 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 878 {
 879         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 880
 881         IRDA_DEBUG(2, "%s()\n", __func__ );
 882
 883         IRDA_ASSERT(self != NULL, return;);
 884         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 885
 886         /* Using software flow control? */
 887         if (I_IXOFF(tty)) {
 888                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 889         }
 890
 891         /* Using hardware flow control? */
 892         if (tty->termios.c_cflag & CRTSCTS) {
 893                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 894
 895                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 896                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 897         }
 898         ircomm_flow_request(self->ircomm, FLOW_START);
 899 }
 900
 901 /*
 902  * Function ircomm_tty_chars_in_buffer (tty)
 903  *
 904  *    Indicates if there are any data in the buffer
 905  *
 906  */
 907 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 908 {
 909         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 910         unsigned long flags;
 911         int len = 0;
 912
 913         IRDA_ASSERT(self != NULL, return -1;);
 914         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 915
 916         spin_lock_irqsave(&self->spinlock, flags);
 917
 918         if (self->tx_skb)
 919                 len = self->tx_skb->len;
 920
 921         spin_unlock_irqrestore(&self->spinlock, flags);
 922
 923         return len;
 924 }
 925
 926 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 927 {
 928         unsigned long flags;
 929
 930         IRDA_ASSERT(self != NULL, return;);
 931         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 932
 933         IRDA_DEBUG(0, "%s()\n", __func__ );
 934
 935         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
 936                 return;
 937
 938         ircomm_tty_detach_cable(self);
 939
 940         spin_lock_irqsave(&self->spinlock, flags);
 941
 942         del_timer(&self->watchdog_timer);
 943
 944         /* Free parameter buffer */
 945         if (self->ctrl_skb) {
 946                 dev_kfree_skb(self->ctrl_skb);
 947                 self->ctrl_skb = NULL;
 948         }
 949
 950         /* Free transmit buffer */
 951         if (self->tx_skb) {
 952                 dev_kfree_skb(self->tx_skb);
 953                 self->tx_skb = NULL;
 954         }
 955
 956         if (self->ircomm) {
 957                 ircomm_close(self->ircomm);
 958                 self->ircomm = NULL;
 959         }
 960
 961         spin_unlock_irqrestore(&self->spinlock, flags);
 962 }
 963
 964 /*
 965  * Function ircomm_tty_hangup (tty)
 966  *
 967  *    This routine notifies the tty driver that it should hangup the tty
 968  *    device.
 969  *
 970  */
 971 static void ircomm_tty_hangup(struct tty_struct *tty)
 972 {
 973         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 974         struct tty_port *port = &self->port;
 975         unsigned long   flags;
 976
 977         IRDA_DEBUG(0, "%s()\n", __func__ );
 978
 979         IRDA_ASSERT(self != NULL, return;);
 980         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 981
 982         /* ircomm_tty_flush_buffer(tty); */
 983         ircomm_tty_shutdown(self);
 984
 985         spin_lock_irqsave(&port->lock, flags);
 986         port->flags &= ~ASYNC_NORMAL_ACTIVE;
 987         if (port->tty) {
 988                 set_bit(TTY_IO_ERROR, &port->tty->flags);
 989                 tty_kref_put(port->tty);
 990         }
 991         port->tty = NULL;
 992         port->count = 0;
 993         spin_unlock_irqrestore(&port->lock, flags);
 994
 995         wake_up_interruptible(&port->open_wait);
 996 }
 997
 998 /*
 999  * Function ircomm_tty_send_xchar (tty, ch)
1000  *
1001  *    This routine is used to send a high-priority XON/XOFF character to
1002  *    the device.
1003  */
1004 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1005 {
1006         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1007 }
1008
1009 /*
1010  * Function ircomm_tty_start (tty)
1011  *
1012  *    This routine notifies the tty driver that it resume sending
1013  *    characters to the tty device.
1014  */
1015 void ircomm_tty_start(struct tty_struct *tty)
1016 {
1017         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1018
1019         ircomm_flow_request(self->ircomm, FLOW_START);
1020 }
1021
1022 /*
1023  * Function ircomm_tty_stop (tty)
1024  *
1025  *     This routine notifies the tty driver that it should stop outputting
1026  *     characters to the tty device.
1027  */
1028 static void ircomm_tty_stop(struct tty_struct *tty)
1029 {
1030         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1031
1032         IRDA_ASSERT(self != NULL, return;);
1033         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1034
1035         ircomm_flow_request(self->ircomm, FLOW_STOP);
1036 }
1037
1038 /*
1039  * Function ircomm_check_modem_status (self)
1040  *
1041  *    Check for any changes in the DCE's line settings. This function should
1042  *    be called whenever the dce parameter settings changes, to update the
1043  *    flow control settings and other things
1044  */
1045 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1046 {
1047         struct tty_struct *tty;
1048         int status;
1049
1050         IRDA_DEBUG(0, "%s()\n", __func__ );
1051
1052         IRDA_ASSERT(self != NULL, return;);
1053         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1054
1055         tty = tty_port_tty_get(&self->port);
1056
1057         status = self->settings.dce;
1058
1059         if (status & IRCOMM_DCE_DELTA_ANY) {
1060                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1061         }
1062         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1063                 IRDA_DEBUG(2,
1064                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1065                            (status & IRCOMM_CD) ? "on" : "off");
1066
1067                 if (status & IRCOMM_CD) {
1068                         wake_up_interruptible(&self->port.open_wait);
1069                 } else {
1070                         IRDA_DEBUG(2,
1071                                    "%s(), Doing serial hangup..\n", __func__ );
1072                         if (tty)
1073                                 tty_hangup(tty);
1074
1075                         /* Hangup will remote the tty, so better break out */
1076                         goto put;
1077                 }
1078         }
1079         if (tty && tty_port_cts_enabled(&self->port)) {
1080                 if (tty->hw_stopped) {
1081                         if (status & IRCOMM_CTS) {
1082                                 IRDA_DEBUG(2,
1083                                            "%s(), CTS tx start...\n", __func__ );
1084                                 tty->hw_stopped = 0;
1085
1086                                 /* Wake up processes blocked on open */
1087                                 wake_up_interruptible(&self->port.open_wait);
1088
1089                                 schedule_work(&self->tqueue);
1090                                 goto put;
1091                         }
1092                 } else {
1093                         if (!(status & IRCOMM_CTS)) {
1094                                 IRDA_DEBUG(2,
1095                                            "%s(), CTS tx stop...\n", __func__ );
1096                                 tty->hw_stopped = 1;
1097                         }
1098                 }
1099         }
1100 put:
1101         tty_kref_put(tty);
1102 }
1103
1104 /*
1105  * Function ircomm_tty_data_indication (instance, sap, skb)
1106  *
1107  *    Handle incoming data, and deliver it to the line discipline
1108  *
1109  */
1110 static int ircomm_tty_data_indication(void *instance, void *sap,
1111                                       struct sk_buff *skb)
1112 {
1113         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1114         struct tty_struct *tty;
1115
1116         IRDA_DEBUG(2, "%s()\n", __func__ );
1117
1118         IRDA_ASSERT(self != NULL, return -1;);
1119         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1120         IRDA_ASSERT(skb != NULL, return -1;);
1121
1122         tty = tty_port_tty_get(&self->port);
1123         if (!tty) {
1124                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1125                 return 0;
1126         }
1127
1128         /*
1129          * If we receive data when hardware is stopped then something is wrong.
1130          * We try to poll the peers line settings to check if we are up todate.
1131          * Devices like WinCE can do this, and since they don't send any
1132          * params, we can just as well declare the hardware for running.
1133          */
1134         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1135                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1136                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1137
1138                 /* We can just as well declare the hardware for running */
1139                 ircomm_tty_send_initial_parameters(self);
1140                 ircomm_tty_link_established(self);
1141         }
1142         tty_kref_put(tty);
1143
1144         /*
1145          * Use flip buffer functions since the code may be called from interrupt
1146          * context
1147          */
1148         tty_insert_flip_string(&self->port, skb->data, skb->len);
1149         tty_flip_buffer_push(&self->port);
1150
1151         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1152
1153         return 0;
1154 }
1155
1156 /*
1157  * Function ircomm_tty_control_indication (instance, sap, skb)
1158  *
1159  *    Parse all incoming parameters (easy!)
1160  *
1161  */
1162 static int ircomm_tty_control_indication(void *instance, void *sap,
1163                                          struct sk_buff *skb)
1164 {
1165         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1166         int clen;
1167
1168         IRDA_DEBUG(4, "%s()\n", __func__ );
1169
1170         IRDA_ASSERT(self != NULL, return -1;);
1171         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1172         IRDA_ASSERT(skb != NULL, return -1;);
1173
1174         clen = skb->data[0];
1175
1176         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1177                                &ircomm_param_info);
1178
1179         /* No need to kfree_skb - see ircomm_control_indication() */
1180
1181         return 0;
1182 }
1183
1184 /*
1185  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1186  *
1187  *    This function is called by IrTTP when it wants us to slow down the
1188  *    transmission of data. We just mark the hardware as stopped, and wait
1189  *    for IrTTP to notify us that things are OK again.
1190  */
1191 static void ircomm_tty_flow_indication(void *instance, void *sap,
1192                                        LOCAL_FLOW cmd)
1193 {
1194         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1195         struct tty_struct *tty;
1196
1197         IRDA_ASSERT(self != NULL, return;);
1198         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1199
1200         tty = tty_port_tty_get(&self->port);
1201
1202         switch (cmd) {
1203         case FLOW_START:
1204                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1205                 if (tty)
1206                         tty->hw_stopped = 0;
1207
1208                 /* ircomm_tty_do_softint will take care of the rest */
1209                 schedule_work(&self->tqueue);
1210                 break;
1211         default:  /* If we get here, something is very wrong, better stop */
1212         case FLOW_STOP:
1213                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1214                 if (tty)
1215                         tty->hw_stopped = 1;
1216                 break;
1217         }
1218
1219         tty_kref_put(tty);
1220         self->flow = cmd;
1221 }
1222
1223 #ifdef CONFIG_PROC_FS
1224 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1225 {
1226         struct tty_struct *tty;
1227         char sep;
1228
1229         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1230
1231         seq_puts(m, "Service type: ");
1232         if (self->service_type & IRCOMM_9_WIRE)
1233                 seq_puts(m, "9_WIRE");
1234         else if (self->service_type & IRCOMM_3_WIRE)
1235                 seq_puts(m, "3_WIRE");
1236         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1237                 seq_puts(m, "3_WIRE_RAW");
1238         else
1239                 seq_puts(m, "No common service type!\n");
1240         seq_putc(m, '\n');
1241
1242         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1243
1244         seq_printf(m, "DTE status:");
1245         sep = ' ';
1246         if (self->settings.dte & IRCOMM_RTS) {
1247                 seq_printf(m, "%cRTS", sep);
1248                 sep = '|';
1249         }
1250         if (self->settings.dte & IRCOMM_DTR) {
1251                 seq_printf(m, "%cDTR", sep);
1252                 sep = '|';
1253         }
1254         seq_putc(m, '\n');
1255
1256         seq_puts(m, "DCE status:");
1257         sep = ' ';
1258         if (self->settings.dce & IRCOMM_CTS) {
1259                 seq_printf(m, "%cCTS", sep);
1260                 sep = '|';
1261         }
1262         if (self->settings.dce & IRCOMM_DSR) {
1263                 seq_printf(m, "%cDSR", sep);
1264                 sep = '|';
1265         }
1266         if (self->settings.dce & IRCOMM_CD) {
1267                 seq_printf(m, "%cCD", sep);
1268                 sep = '|';
1269         }
1270         if (self->settings.dce & IRCOMM_RI) {
1271                 seq_printf(m, "%cRI", sep);
1272                 sep = '|';
1273         }
1274         seq_putc(m, '\n');
1275
1276         seq_puts(m, "Configuration: ");
1277         if (!self->settings.null_modem)
1278                 seq_puts(m, "DTE <-> DCE\n");
1279         else
1280                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1281
1282         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1283
1284         seq_puts(m, "Flow control:");
1285         sep = ' ';
1286         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1287                 seq_printf(m, "%cXON_XOFF_IN", sep);
1288                 sep = '|';
1289         }
1290         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1291                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1292                 sep = '|';
1293         }
1294         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1295                 seq_printf(m, "%cRTS_CTS_IN", sep);
1296                 sep = '|';
1297         }
1298         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1299                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1300                 sep = '|';
1301         }
1302         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1303                 seq_printf(m, "%cDSR_DTR_IN", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1307                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1311                 seq_printf(m, "%cENQ_ACK_IN", sep);
1312                 sep = '|';
1313         }
1314         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1315                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1316                 sep = '|';
1317         }
1318         seq_putc(m, '\n');
1319
1320         seq_puts(m, "Flags:");
1321         sep = ' ';
1322         if (tty_port_cts_enabled(&self->port)) {
1323                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1324                 sep = '|';
1325         }
1326         if (self->port.flags & ASYNC_CHECK_CD) {
1327                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1328                 sep = '|';
1329         }
1330         if (self->port.flags & ASYNC_INITIALIZED) {
1331                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1332                 sep = '|';
1333         }
1334         if (self->port.flags & ASYNC_LOW_LATENCY) {
1335                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1336                 sep = '|';
1337         }
1338         if (self->port.flags & ASYNC_CLOSING) {
1339                 seq_printf(m, "%cASYNC_CLOSING", sep);
1340                 sep = '|';
1341         }
1342         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1343                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1344                 sep = '|';
1345         }
1346         seq_putc(m, '\n');
1347
1348         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1349         seq_printf(m, "Open count: %d\n", self->port.count);
1350         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1351         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1352
1353         tty = tty_port_tty_get(&self->port);
1354         if (tty) {
1355                 seq_printf(m, "Hardware: %s\n",
1356                                tty->hw_stopped ? "Stopped" : "Running");
1357                 tty_kref_put(tty);
1358         }
1359 }
1360
1361 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1362 {
1363         struct ircomm_tty_cb *self;
1364         unsigned long flags;
1365
1366         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1367
1368         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1369         while (self != NULL) {
1370                 if (self->magic != IRCOMM_TTY_MAGIC)
1371                         break;
1372
1373                 ircomm_tty_line_info(self, m);
1374                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1375         }
1376         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1377         return 0;
1378 }
1379
1380 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1381 {
1382         return single_open(file, ircomm_tty_proc_show, NULL);
1383 }
1384
1385 static const struct file_operations ircomm_tty_proc_fops = {
1386         .owner          = THIS_MODULE,
1387         .open           = ircomm_tty_proc_open,
1388         .read           = seq_read,
1389         .llseek         = seq_lseek,
1390         .release        = single_release,
1391 };
1392 #endif /* CONFIG_PROC_FS */
1393
1394 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1395 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1396 MODULE_LICENSE("GPL");
1397 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1398
1399 module_init(ircomm_tty_init);
1400 module_exit(ircomm_tty_cleanup);