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