net/irda/ircomm/ircomm_tty.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty.c
   4  * Version:       1.0
   5  * Description:   IrCOMM serial TTY driver
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 21:00:56 1999
   9  * Modified at:   Wed Feb 23 00:09:02 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
  12  *
  13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/slab.h>
  37 #include <linux/sched.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/termios.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  44
  45 #include <asm/uaccess.h>
  46
  47 #include <net/irda/irda.h>
  48 #include <net/irda/irmod.h>
  49
  50 #include <net/irda/ircomm_core.h>
  51 #include <net/irda/ircomm_param.h>
  52 #include <net/irda/ircomm_tty_attach.h>
  53 #include <net/irda/ircomm_tty.h>
  54
  55 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  56 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  57 static int  ircomm_tty_write(struct tty_struct * tty,
  58                              const unsigned char *buf, int count);
  59 static int  ircomm_tty_write_room(struct tty_struct *tty);
  60 static void ircomm_tty_throttle(struct tty_struct *tty);
  61 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  62 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  63 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  64 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  65 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  66 static void ircomm_tty_hangup(struct tty_struct *tty);
  67 static void ircomm_tty_do_softint(struct work_struct *work);
  68 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  69 static void ircomm_tty_stop(struct tty_struct *tty);
  70
  71 static int ircomm_tty_data_indication(void *instance, void *sap,
  72                                       struct sk_buff *skb);
  73 static int ircomm_tty_control_indication(void *instance, void *sap,
  74                                          struct sk_buff *skb);
  75 static void ircomm_tty_flow_indication(void *instance, void *sap,
  76                                        LOCAL_FLOW cmd);
  77 #ifdef CONFIG_PROC_FS
  78 static const struct file_operations ircomm_tty_proc_fops;
  79 #endif /* CONFIG_PROC_FS */
  80 static struct tty_driver *driver;
  81
  82 static hashbin_t *ircomm_tty = NULL;
  83
  84 static const struct tty_operations ops = {
  85         .open            = ircomm_tty_open,
  86         .close           = ircomm_tty_close,
  87         .write           = ircomm_tty_write,
  88         .write_room      = ircomm_tty_write_room,
  89         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  90         .flush_buffer    = ircomm_tty_flush_buffer,
  91         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  92         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  93         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  94         .throttle        = ircomm_tty_throttle,
  95         .unthrottle      = ircomm_tty_unthrottle,
  96         .send_xchar      = ircomm_tty_send_xchar,
  97         .set_termios     = ircomm_tty_set_termios,
  98         .stop            = ircomm_tty_stop,
  99         .start           = ircomm_tty_start,
 100         .hangup          = ircomm_tty_hangup,
 101         .wait_until_sent = ircomm_tty_wait_until_sent,
 102 #ifdef CONFIG_PROC_FS
 103         .proc_fops       = &ircomm_tty_proc_fops,
 104 #endif /* CONFIG_PROC_FS */
 105 };
 106
 107 /*
 108  * Function ircomm_tty_init()
 109  *
 110  *    Init IrCOMM TTY layer/driver
 111  *
 112  */
 113 static int __init ircomm_tty_init(void)
 114 {
 115         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 116         if (!driver)
 117                 return -ENOMEM;
 118         ircomm_tty = hashbin_new(HB_LOCK);
 119         if (ircomm_tty == NULL) {
 120                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 121                 put_tty_driver(driver);
 122                 return -ENOMEM;
 123         }
 124
 125         driver->driver_name     = "ircomm";
 126         driver->name            = "ircomm";
 127         driver->major           = IRCOMM_TTY_MAJOR;
 128         driver->minor_start     = IRCOMM_TTY_MINOR;
 129         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 130         driver->subtype         = SERIAL_TYPE_NORMAL;
 131         driver->init_termios    = tty_std_termios;
 132         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 133         driver->flags           = TTY_DRIVER_REAL_RAW;
 134         tty_set_operations(driver, &ops);
 135         if (tty_register_driver(driver)) {
 136                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 137                            __func__);
 138                 put_tty_driver(driver);
 139                 return -1;
 140         }
 141         return 0;
 142 }
 143
 144 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 145 {
 146         IRDA_DEBUG(0, "%s()\n", __func__ );
 147
 148         IRDA_ASSERT(self != NULL, return;);
 149         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 150
 151         ircomm_tty_shutdown(self);
 152
 153         self->magic = 0;
 154         kfree(self);
 155 }
 156
 157 /*
 158  * Function ircomm_tty_cleanup ()
 159  *
 160  *    Remove IrCOMM TTY layer/driver
 161  *
 162  */
 163 static void __exit ircomm_tty_cleanup(void)
 164 {
 165         int ret;
 166
 167         IRDA_DEBUG(4, "%s()\n", __func__ );
 168
 169         ret = tty_unregister_driver(driver);
 170         if (ret) {
 171                 IRDA_ERROR("%s(), failed to unregister driver\n",
 172                            __func__);
 173                 return;
 174         }
 175
 176         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 177         put_tty_driver(driver);
 178 }
 179
 180 /*
 181  * Function ircomm_startup (self)
 182  *
 183  *
 184  *
 185  */
 186 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 187 {
 188         notify_t notify;
 189         int ret = -ENODEV;
 190
 191         IRDA_DEBUG(2, "%s()\n", __func__ );
 192
 193         IRDA_ASSERT(self != NULL, return -1;);
 194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 195
 196         /* Check if already open */
 197         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 198                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 199                 return 0;
 200         }
 201
 202         /* Register with IrCOMM */
 203         irda_notify_init(&notify);
 204         /* These callbacks we must handle ourselves */
 205         notify.data_indication       = ircomm_tty_data_indication;
 206         notify.udata_indication      = ircomm_tty_control_indication;
 207         notify.flow_indication       = ircomm_tty_flow_indication;
 208
 209         /* Use the ircomm_tty interface for these ones */
 210         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 211         notify.connect_confirm       = ircomm_tty_connect_confirm;
 212         notify.connect_indication    = ircomm_tty_connect_indication;
 213         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 214         notify.instance = self;
 215
 216         if (!self->ircomm) {
 217                 self->ircomm = ircomm_open(&notify, self->service_type,
 218                                            self->line);
 219         }
 220         if (!self->ircomm)
 221                 goto err;
 222
 223         self->slsap_sel = self->ircomm->slsap_sel;
 224
 225         /* Connect IrCOMM link with remote device */
 226         ret = ircomm_tty_attach_cable(self);
 227         if (ret < 0) {
 228                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 229                 goto err;
 230         }
 231
 232         return 0;
 233 err:
 234         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
 235         return ret;
 236 }
 237
 238 /*
 239  * Function ircomm_block_til_ready (self, filp)
 240  *
 241  *
 242  *
 243  */
 244 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 245                                       struct file *filp)
 246 {
 247         DECLARE_WAITQUEUE(wait, current);
 248         int             retval;
 249         int             do_clocal = 0, extra_count = 0;
 250         unsigned long   flags;
 251         struct tty_struct *tty;
 252
 253         IRDA_DEBUG(2, "%s()\n", __func__ );
 254
 255         tty = self->tty;
 256
 257         /*
 258          * If non-blocking mode is set, or the port is not enabled,
 259          * then make the check up front and then exit.
 260          */
 261         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 262                 /* nonblock mode is set or port is not enabled */
 263                 self->flags |= ASYNC_NORMAL_ACTIVE;
 264                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 265                 return 0;
 266         }
 267
 268         if (tty->termios->c_cflag & CLOCAL) {
 269                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 270                 do_clocal = 1;
 271         }
 272
 273         /* Wait for carrier detect and the line to become
 274          * free (i.e., not in use by the callout).  While we are in
 275          * this loop, self->open_count is dropped by one, so that
 276          * mgsl_close() knows when to free things.  We restore it upon
 277          * exit, either normal or abnormal.
 278          */
 279
 280         retval = 0;
 281         add_wait_queue(&self->port.open_wait, &wait);
 282
 283         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 284               __FILE__,__LINE__, tty->driver->name, self->open_count );
 285
 286         /* As far as I can see, we protect open_count - Jean II */
 287         spin_lock_irqsave(&self->spinlock, flags);
 288         if (!tty_hung_up_p(filp)) {
 289                 extra_count = 1;
 290                 self->open_count--;
 291         }
 292         spin_unlock_irqrestore(&self->spinlock, flags);
 293         self->blocked_open++;
 294
 295         while (1) {
 296                 if (tty->termios->c_cflag & CBAUD) {
 297                         /* Here, we use to lock those two guys, but
 298                          * as ircomm_param_request() does it itself,
 299                          * I don't see the point (and I see the deadlock).
 300                          * Jean II */
 301                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 302
 303                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 304                 }
 305
 306                 current->state = TASK_INTERRUPTIBLE;
 307
 308                 if (tty_hung_up_p(filp) ||
 309                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 310                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 311                                         -EAGAIN : -ERESTARTSYS;
 312                         break;
 313                 }
 314
 315                 /*
 316                  * Check if link is ready now. Even if CLOCAL is
 317                  * specified, we cannot return before the IrCOMM link is
 318                  * ready
 319                  */
 320                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
 321                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 322                     self->state == IRCOMM_TTY_READY)
 323                 {
 324                         break;
 325                 }
 326
 327                 if (signal_pending(current)) {
 328                         retval = -ERESTARTSYS;
 329                         break;
 330                 }
 331
 332                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 333                       __FILE__,__LINE__, tty->driver->name, self->open_count );
 334
 335                 schedule();
 336         }
 337
 338         __set_current_state(TASK_RUNNING);
 339         remove_wait_queue(&self->port.open_wait, &wait);
 340
 341         if (extra_count) {
 342                 /* ++ is not atomic, so this should be protected - Jean II */
 343                 spin_lock_irqsave(&self->spinlock, flags);
 344                 self->open_count++;
 345                 spin_unlock_irqrestore(&self->spinlock, flags);
 346         }
 347         self->blocked_open--;
 348
 349         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 350               __FILE__,__LINE__, tty->driver->name, self->open_count);
 351
 352         if (!retval)
 353                 self->flags |= ASYNC_NORMAL_ACTIVE;
 354
 355         return retval;
 356 }
 357
 358 /*
 359  * Function ircomm_tty_open (tty, filp)
 360  *
 361  *    This routine is called when a particular tty device is opened. This
 362  *    routine is mandatory; if this routine is not filled in, the attempted
 363  *    open will fail with ENODEV.
 364  */
 365 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 366 {
 367         struct ircomm_tty_cb *self;
 368         unsigned int line = tty->index;
 369         unsigned long   flags;
 370         int ret;
 371
 372         IRDA_DEBUG(2, "%s()\n", __func__ );
 373
 374         /* Check if instance already exists */
 375         self = hashbin_lock_find(ircomm_tty, line, NULL);
 376         if (!self) {
 377                 /* No, so make new instance */
 378                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 379                 if (self == NULL) {
 380                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 381                         return -ENOMEM;
 382                 }
 383
 384                 tty_port_init(&self->port);
 385                 self->magic = IRCOMM_TTY_MAGIC;
 386                 self->flow = FLOW_STOP;
 387
 388                 self->line = line;
 389                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 390                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 391                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 392
 393                 /* Init some important stuff */
 394                 init_timer(&self->watchdog_timer);
 395                 spin_lock_init(&self->spinlock);
 396
 397                 /*
 398                  * Force TTY into raw mode by default which is usually what
 399                  * we want for IrCOMM and IrLPT. This way applications will
 400                  * not have to twiddle with printcap etc.
 401                  *
 402                  * Note this is completely usafe and doesn't work properly
 403                  */
 404                 tty->termios->c_iflag = 0;
 405                 tty->termios->c_oflag = 0;
 406
 407                 /* Insert into hash */
 408                 /* FIXME there is a window from find to here */
 409                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 410         }
 411         /* ++ is not atomic, so this should be protected - Jean II */
 412         spin_lock_irqsave(&self->spinlock, flags);
 413         self->open_count++;
 414
 415         tty->driver_data = self;
 416         self->tty = tty;
 417         spin_unlock_irqrestore(&self->spinlock, flags);
 418
 419         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 420                    self->line, self->open_count);
 421
 422         /* Not really used by us, but lets do it anyway */
 423         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 424
 425         /*
 426          * If the port is the middle of closing, bail out now
 427          */
 428         if (tty_hung_up_p(filp) ||
 429             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 430
 431                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 432                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 433                  * IMHO it's either not needed in the first place
 434                  * or for some reason we need to make sure the async
 435                  * closing has been finished - if so, wouldn't we
 436                  * probably better sleep uninterruptible?
 437                  */
 438
 439                 if (wait_event_interruptible(self->port.close_wait,
 440                                 !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 441                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 442                                      __func__);
 443                         return -ERESTARTSYS;
 444                 }
 445
 446 #ifdef SERIAL_DO_RESTART
 447                 return (self->flags & ASYNC_HUP_NOTIFY) ?
 448                         -EAGAIN : -ERESTARTSYS;
 449 #else
 450                 return -EAGAIN;
 451 #endif
 452         }
 453
 454         /* Check if this is a "normal" ircomm device, or an irlpt device */
 455         if (line < 0x10) {
 456                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 457                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 458                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 459                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 460                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 461         } else {
 462                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 463                 self->service_type = IRCOMM_3_WIRE_RAW;
 464                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 465         }
 466
 467         ret = ircomm_tty_startup(self);
 468         if (ret)
 469                 return ret;
 470
 471         ret = ircomm_tty_block_til_ready(self, filp);
 472         if (ret) {
 473                 IRDA_DEBUG(2,
 474                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 475                       ret);
 476
 477                 return ret;
 478         }
 479         return 0;
 480 }
 481
 482 /*
 483  * Function ircomm_tty_close (tty, filp)
 484  *
 485  *    This routine is called when a particular tty device is closed.
 486  *
 487  */
 488 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 489 {
 490         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 491         unsigned long flags;
 492
 493         IRDA_DEBUG(0, "%s()\n", __func__ );
 494
 495         IRDA_ASSERT(self != NULL, return;);
 496         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 497
 498         spin_lock_irqsave(&self->spinlock, flags);
 499
 500         if (tty_hung_up_p(filp)) {
 501                 spin_unlock_irqrestore(&self->spinlock, flags);
 502
 503                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 504                 return;
 505         }
 506
 507         if ((tty->count == 1) && (self->open_count != 1)) {
 508                 /*
 509                  * Uh, oh.  tty->count is 1, which means that the tty
 510                  * structure will be freed.  state->count should always
 511                  * be one in these conditions.  If it's greater than
 512                  * one, we've got real problems, since it means the
 513                  * serial port won't be shutdown.
 514                  */
 515                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 516                            "tty->count is 1, state->count is %d\n", __func__ ,
 517                            self->open_count);
 518                 self->open_count = 1;
 519         }
 520
 521         if (--self->open_count < 0) {
 522                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 523                            __func__, self->line, self->open_count);
 524                 self->open_count = 0;
 525         }
 526         if (self->open_count) {
 527                 spin_unlock_irqrestore(&self->spinlock, flags);
 528
 529                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 530                 return;
 531         }
 532
 533         /* Hum... Should be test_and_set_bit ??? - Jean II */
 534         set_bit(ASYNC_B_CLOSING, &self->flags);
 535
 536         /* We need to unlock here (we were unlocking at the end of this
 537          * function), because tty_wait_until_sent() may schedule.
 538          * I don't know if the rest should be protected somehow,
 539          * so someone should check. - Jean II */
 540         spin_unlock_irqrestore(&self->spinlock, flags);
 541
 542         /*
 543          * Now we wait for the transmit buffer to clear; and we notify
 544          * the line discipline to only process XON/XOFF characters.
 545          */
 546         tty->closing = 1;
 547         if (self->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
 548                 tty_wait_until_sent_from_close(tty, self->port.closing_wait);
 549
 550         ircomm_tty_shutdown(self);
 551
 552         tty_driver_flush_buffer(tty);
 553         tty_ldisc_flush(tty);
 554
 555         tty->closing = 0;
 556         self->tty = NULL;
 557
 558         if (self->blocked_open) {
 559                 if (self->port.close_delay)
 560                         schedule_timeout_interruptible(self->port.close_delay);
 561                 wake_up_interruptible(&self->port.open_wait);
 562         }
 563
 564         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 565         wake_up_interruptible(&self->port.close_wait);
 566 }
 567
 568 /*
 569  * Function ircomm_tty_flush_buffer (tty)
 570  *
 571  *
 572  *
 573  */
 574 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 575 {
 576         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 577
 578         IRDA_ASSERT(self != NULL, return;);
 579         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 580
 581         /*
 582          * Let do_softint() do this to avoid race condition with
 583          * do_softint() ;-)
 584          */
 585         schedule_work(&self->tqueue);
 586 }
 587
 588 /*
 589  * Function ircomm_tty_do_softint (work)
 590  *
 591  *    We use this routine to give the write wakeup to the user at at a
 592  *    safe time (as fast as possible after write have completed). This
 593  *    can be compared to the Tx interrupt.
 594  */
 595 static void ircomm_tty_do_softint(struct work_struct *work)
 596 {
 597         struct ircomm_tty_cb *self =
 598                 container_of(work, struct ircomm_tty_cb, tqueue);
 599         struct tty_struct *tty;
 600         unsigned long flags;
 601         struct sk_buff *skb, *ctrl_skb;
 602
 603         IRDA_DEBUG(2, "%s()\n", __func__ );
 604
 605         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 606                 return;
 607
 608         tty = self->tty;
 609         if (!tty)
 610                 return;
 611
 612         /* Unlink control buffer */
 613         spin_lock_irqsave(&self->spinlock, flags);
 614
 615         ctrl_skb = self->ctrl_skb;
 616         self->ctrl_skb = NULL;
 617
 618         spin_unlock_irqrestore(&self->spinlock, flags);
 619
 620         /* Flush control buffer if any */
 621         if(ctrl_skb) {
 622                 if(self->flow == FLOW_START)
 623                         ircomm_control_request(self->ircomm, ctrl_skb);
 624                 /* Drop reference count - see ircomm_ttp_data_request(). */
 625                 dev_kfree_skb(ctrl_skb);
 626         }
 627
 628         if (tty->hw_stopped)
 629                 return;
 630
 631         /* Unlink transmit buffer */
 632         spin_lock_irqsave(&self->spinlock, flags);
 633
 634         skb = self->tx_skb;
 635         self->tx_skb = NULL;
 636
 637         spin_unlock_irqrestore(&self->spinlock, flags);
 638
 639         /* Flush transmit buffer if any */
 640         if (skb) {
 641                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 642                 /* Drop reference count - see ircomm_ttp_data_request(). */
 643                 dev_kfree_skb(skb);
 644         }
 645
 646         /* Check if user (still) wants to be waken up */
 647         tty_wakeup(tty);
 648 }
 649
 650 /*
 651  * Function ircomm_tty_write (tty, buf, count)
 652  *
 653  *    This routine is called by the kernel to write a series of characters
 654  *    to the tty device. The characters may come from user space or kernel
 655  *    space. This routine will return the number of characters actually
 656  *    accepted for writing. This routine is mandatory.
 657  */
 658 static int ircomm_tty_write(struct tty_struct *tty,
 659                             const unsigned char *buf, int count)
 660 {
 661         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 662         unsigned long flags;
 663         struct sk_buff *skb;
 664         int tailroom = 0;
 665         int len = 0;
 666         int size;
 667
 668         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 669                    tty->hw_stopped);
 670
 671         IRDA_ASSERT(self != NULL, return -1;);
 672         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 673
 674         /* We may receive packets from the TTY even before we have finished
 675          * our setup. Not cool.
 676          * The problem is that we don't know the final header and data size
 677          * to create the proper skb, so any skb we would create would have
 678          * bogus header and data size, so need care.
 679          * We use a bogus header size to safely detect this condition.
 680          * Another problem is that hw_stopped was set to 0 way before it
 681          * should be, so we would drop this skb. It should now be fixed.
 682          * One option is to not accept data until we are properly setup.
 683          * But, I suspect that when it happens, the ppp line discipline
 684          * just "drops" the data, which might screw up connect scripts.
 685          * The second option is to create a "safe skb", with large header
 686          * and small size (see ircomm_tty_open() for values).
 687          * We just need to make sure that when the real values get filled,
 688          * we don't mess up the original "safe skb" (see tx_data_size).
 689          * Jean II */
 690         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 691                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 692 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 693                 /* We didn't consume anything, TTY will retry */
 694                 return 0;
 695 #endif
 696         }
 697
 698         if (count < 1)
 699                 return 0;
 700
 701         /* Protect our manipulation of self->tx_skb and related */
 702         spin_lock_irqsave(&self->spinlock, flags);
 703
 704         /* Fetch current transmit buffer */
 705         skb = self->tx_skb;
 706
 707         /*
 708          * Send out all the data we get, possibly as multiple fragmented
 709          * frames, but this will only happen if the data is larger than the
 710          * max data size. The normal case however is just the opposite, and
 711          * this function may be called multiple times, and will then actually
 712          * defragment the data and send it out as one packet as soon as
 713          * possible, but at a safer point in time
 714          */
 715         while (count) {
 716                 size = count;
 717
 718                 /* Adjust data size to the max data size */
 719                 if (size > self->max_data_size)
 720                         size = self->max_data_size;
 721
 722                 /*
 723                  * Do we already have a buffer ready for transmit, or do
 724                  * we need to allocate a new frame
 725                  */
 726                 if (skb) {
 727                         /*
 728                          * Any room for more data at the end of the current
 729                          * transmit buffer? Cannot use skb_tailroom, since
 730                          * dev_alloc_skb gives us a larger skb than we
 731                          * requested
 732                          * Note : use tx_data_size, because max_data_size
 733                          * may have changed and we don't want to overwrite
 734                          * the skb. - Jean II
 735                          */
 736                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 737                                 /* Adjust data to tailroom */
 738                                 if (size > tailroom)
 739                                         size = tailroom;
 740                         } else {
 741                                 /*
 742                                  * Current transmit frame is full, so break
 743                                  * out, so we can send it as soon as possible
 744                                  */
 745                                 break;
 746                         }
 747                 } else {
 748                         /* Prepare a full sized frame */
 749                         skb = alloc_skb(self->max_data_size+
 750                                         self->max_header_size,
 751                                         GFP_ATOMIC);
 752                         if (!skb) {
 753                                 spin_unlock_irqrestore(&self->spinlock, flags);
 754                                 return -ENOBUFS;
 755                         }
 756                         skb_reserve(skb, self->max_header_size);
 757                         self->tx_skb = skb;
 758                         /* Remember skb size because max_data_size may
 759                          * change later on - Jean II */
 760                         self->tx_data_size = self->max_data_size;
 761                 }
 762
 763                 /* Copy data */
 764                 memcpy(skb_put(skb,size), buf + len, size);
 765
 766                 count -= size;
 767                 len += size;
 768         }
 769
 770         spin_unlock_irqrestore(&self->spinlock, flags);
 771
 772         /*
 773          * Schedule a new thread which will transmit the frame as soon
 774          * as possible, but at a safe point in time. We do this so the
 775          * "user" can give us data multiple times, as PPP does (because of
 776          * its 256 byte tx buffer). We will then defragment and send out
 777          * all this data as one single packet.
 778          */
 779         schedule_work(&self->tqueue);
 780
 781         return len;
 782 }
 783
 784 /*
 785  * Function ircomm_tty_write_room (tty)
 786  *
 787  *    This routine returns the numbers of characters the tty driver will
 788  *    accept for queuing to be written. This number is subject to change as
 789  *    output buffers get emptied, or if the output flow control is acted.
 790  */
 791 static int ircomm_tty_write_room(struct tty_struct *tty)
 792 {
 793         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 794         unsigned long flags;
 795         int ret;
 796
 797         IRDA_ASSERT(self != NULL, return -1;);
 798         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 799
 800 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 801         /* max_header_size tells us if the channel is initialised or not. */
 802         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 803                 /* Don't bother us yet */
 804                 return 0;
 805 #endif
 806
 807         /* Check if we are allowed to transmit any data.
 808          * hw_stopped is the regular flow control.
 809          * Jean II */
 810         if (tty->hw_stopped)
 811                 ret = 0;
 812         else {
 813                 spin_lock_irqsave(&self->spinlock, flags);
 814                 if (self->tx_skb)
 815                         ret = self->tx_data_size - self->tx_skb->len;
 816                 else
 817                         ret = self->max_data_size;
 818                 spin_unlock_irqrestore(&self->spinlock, flags);
 819         }
 820         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 821
 822         return ret;
 823 }
 824
 825 /*
 826  * Function ircomm_tty_wait_until_sent (tty, timeout)
 827  *
 828  *    This routine waits until the device has written out all of the
 829  *    characters in its transmitter FIFO.
 830  */
 831 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 832 {
 833         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 834         unsigned long orig_jiffies, poll_time;
 835         unsigned long flags;
 836
 837         IRDA_DEBUG(2, "%s()\n", __func__ );
 838
 839         IRDA_ASSERT(self != NULL, return;);
 840         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 841
 842         orig_jiffies = jiffies;
 843
 844         /* Set poll time to 200 ms */
 845         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 846
 847         spin_lock_irqsave(&self->spinlock, flags);
 848         while (self->tx_skb && self->tx_skb->len) {
 849                 spin_unlock_irqrestore(&self->spinlock, flags);
 850                 schedule_timeout_interruptible(poll_time);
 851                 spin_lock_irqsave(&self->spinlock, flags);
 852                 if (signal_pending(current))
 853                         break;
 854                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 855                         break;
 856         }
 857         spin_unlock_irqrestore(&self->spinlock, flags);
 858         current->state = TASK_RUNNING;
 859 }
 860
 861 /*
 862  * Function ircomm_tty_throttle (tty)
 863  *
 864  *    This routine notifies the tty driver that input buffers for the line
 865  *    discipline are close to full, and it should somehow signal that no
 866  *    more characters should be sent to the tty.
 867  */
 868 static void ircomm_tty_throttle(struct tty_struct *tty)
 869 {
 870         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 871
 872         IRDA_DEBUG(2, "%s()\n", __func__ );
 873
 874         IRDA_ASSERT(self != NULL, return;);
 875         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 876
 877         /* Software flow control? */
 878         if (I_IXOFF(tty))
 879                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 880
 881         /* Hardware flow control? */
 882         if (tty->termios->c_cflag & CRTSCTS) {
 883                 self->settings.dte &= ~IRCOMM_RTS;
 884                 self->settings.dte |= IRCOMM_DELTA_RTS;
 885
 886                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 887         }
 888
 889         ircomm_flow_request(self->ircomm, FLOW_STOP);
 890 }
 891
 892 /*
 893  * Function ircomm_tty_unthrottle (tty)
 894  *
 895  *    This routine notifies the tty drivers that it should signals that
 896  *    characters can now be sent to the tty without fear of overrunning the
 897  *    input buffers of the line disciplines.
 898  */
 899 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 900 {
 901         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 902
 903         IRDA_DEBUG(2, "%s()\n", __func__ );
 904
 905         IRDA_ASSERT(self != NULL, return;);
 906         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 907
 908         /* Using software flow control? */
 909         if (I_IXOFF(tty)) {
 910                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 911         }
 912
 913         /* Using hardware flow control? */
 914         if (tty->termios->c_cflag & CRTSCTS) {
 915                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 916
 917                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 918                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 919         }
 920         ircomm_flow_request(self->ircomm, FLOW_START);
 921 }
 922
 923 /*
 924  * Function ircomm_tty_chars_in_buffer (tty)
 925  *
 926  *    Indicates if there are any data in the buffer
 927  *
 928  */
 929 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 930 {
 931         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 932         unsigned long flags;
 933         int len = 0;
 934
 935         IRDA_ASSERT(self != NULL, return -1;);
 936         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 937
 938         spin_lock_irqsave(&self->spinlock, flags);
 939
 940         if (self->tx_skb)
 941                 len = self->tx_skb->len;
 942
 943         spin_unlock_irqrestore(&self->spinlock, flags);
 944
 945         return len;
 946 }
 947
 948 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 949 {
 950         unsigned long flags;
 951
 952         IRDA_ASSERT(self != NULL, return;);
 953         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 954
 955         IRDA_DEBUG(0, "%s()\n", __func__ );
 956
 957         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 958                 return;
 959
 960         ircomm_tty_detach_cable(self);
 961
 962         spin_lock_irqsave(&self->spinlock, flags);
 963
 964         del_timer(&self->watchdog_timer);
 965
 966         /* Free parameter buffer */
 967         if (self->ctrl_skb) {
 968                 dev_kfree_skb(self->ctrl_skb);
 969                 self->ctrl_skb = NULL;
 970         }
 971
 972         /* Free transmit buffer */
 973         if (self->tx_skb) {
 974                 dev_kfree_skb(self->tx_skb);
 975                 self->tx_skb = NULL;
 976         }
 977
 978         if (self->ircomm) {
 979                 ircomm_close(self->ircomm);
 980                 self->ircomm = NULL;
 981         }
 982
 983         spin_unlock_irqrestore(&self->spinlock, flags);
 984 }
 985
 986 /*
 987  * Function ircomm_tty_hangup (tty)
 988  *
 989  *    This routine notifies the tty driver that it should hangup the tty
 990  *    device.
 991  *
 992  */
 993 static void ircomm_tty_hangup(struct tty_struct *tty)
 994 {
 995         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 996         unsigned long   flags;
 997
 998         IRDA_DEBUG(0, "%s()\n", __func__ );
 999
1000         IRDA_ASSERT(self != NULL, return;);
1001         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1002
1003         /* ircomm_tty_flush_buffer(tty); */
1004         ircomm_tty_shutdown(self);
1005
1006         /* I guess we need to lock here - Jean II */
1007         spin_lock_irqsave(&self->spinlock, flags);
1008         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1009         self->tty = NULL;
1010         self->open_count = 0;
1011         spin_unlock_irqrestore(&self->spinlock, flags);
1012
1013         wake_up_interruptible(&self->port.open_wait);
1014 }
1015
1016 /*
1017  * Function ircomm_tty_send_xchar (tty, ch)
1018  *
1019  *    This routine is used to send a high-priority XON/XOFF character to
1020  *    the device.
1021  */
1022 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1023 {
1024         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1025 }
1026
1027 /*
1028  * Function ircomm_tty_start (tty)
1029  *
1030  *    This routine notifies the tty driver that it resume sending
1031  *    characters to the tty device.
1032  */
1033 void ircomm_tty_start(struct tty_struct *tty)
1034 {
1035         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1036
1037         ircomm_flow_request(self->ircomm, FLOW_START);
1038 }
1039
1040 /*
1041  * Function ircomm_tty_stop (tty)
1042  *
1043  *     This routine notifies the tty driver that it should stop outputting
1044  *     characters to the tty device.
1045  */
1046 static void ircomm_tty_stop(struct tty_struct *tty)
1047 {
1048         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1049
1050         IRDA_ASSERT(self != NULL, return;);
1051         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1052
1053         ircomm_flow_request(self->ircomm, FLOW_STOP);
1054 }
1055
1056 /*
1057  * Function ircomm_check_modem_status (self)
1058  *
1059  *    Check for any changes in the DCE's line settings. This function should
1060  *    be called whenever the dce parameter settings changes, to update the
1061  *    flow control settings and other things
1062  */
1063 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1064 {
1065         struct tty_struct *tty;
1066         int status;
1067
1068         IRDA_DEBUG(0, "%s()\n", __func__ );
1069
1070         IRDA_ASSERT(self != NULL, return;);
1071         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1072
1073         tty = self->tty;
1074
1075         status = self->settings.dce;
1076
1077         if (status & IRCOMM_DCE_DELTA_ANY) {
1078                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1079         }
1080         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1081                 IRDA_DEBUG(2,
1082                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1083                            (status & IRCOMM_CD) ? "on" : "off");
1084
1085                 if (status & IRCOMM_CD) {
1086                         wake_up_interruptible(&self->port.open_wait);
1087                 } else {
1088                         IRDA_DEBUG(2,
1089                                    "%s(), Doing serial hangup..\n", __func__ );
1090                         if (tty)
1091                                 tty_hangup(tty);
1092
1093                         /* Hangup will remote the tty, so better break out */
1094                         return;
1095                 }
1096         }
1097         if (self->flags & ASYNC_CTS_FLOW) {
1098                 if (tty->hw_stopped) {
1099                         if (status & IRCOMM_CTS) {
1100                                 IRDA_DEBUG(2,
1101                                            "%s(), CTS tx start...\n", __func__ );
1102                                 tty->hw_stopped = 0;
1103
1104                                 /* Wake up processes blocked on open */
1105                                 wake_up_interruptible(&self->port.open_wait);
1106
1107                                 schedule_work(&self->tqueue);
1108                                 return;
1109                         }
1110                 } else {
1111                         if (!(status & IRCOMM_CTS)) {
1112                                 IRDA_DEBUG(2,
1113                                            "%s(), CTS tx stop...\n", __func__ );
1114                                 tty->hw_stopped = 1;
1115                         }
1116                 }
1117         }
1118 }
1119
1120 /*
1121  * Function ircomm_tty_data_indication (instance, sap, skb)
1122  *
1123  *    Handle incoming data, and deliver it to the line discipline
1124  *
1125  */
1126 static int ircomm_tty_data_indication(void *instance, void *sap,
1127                                       struct sk_buff *skb)
1128 {
1129         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1130
1131         IRDA_DEBUG(2, "%s()\n", __func__ );
1132
1133         IRDA_ASSERT(self != NULL, return -1;);
1134         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1135         IRDA_ASSERT(skb != NULL, return -1;);
1136
1137         if (!self->tty) {
1138                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1139                 return 0;
1140         }
1141
1142         /*
1143          * If we receive data when hardware is stopped then something is wrong.
1144          * We try to poll the peers line settings to check if we are up todate.
1145          * Devices like WinCE can do this, and since they don't send any
1146          * params, we can just as well declare the hardware for running.
1147          */
1148         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1149                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1150                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1151
1152                 /* We can just as well declare the hardware for running */
1153                 ircomm_tty_send_initial_parameters(self);
1154                 ircomm_tty_link_established(self);
1155         }
1156
1157         /*
1158          * Use flip buffer functions since the code may be called from interrupt
1159          * context
1160          */
1161         tty_insert_flip_string(self->tty, skb->data, skb->len);
1162         tty_flip_buffer_push(self->tty);
1163
1164         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1165
1166         return 0;
1167 }
1168
1169 /*
1170  * Function ircomm_tty_control_indication (instance, sap, skb)
1171  *
1172  *    Parse all incoming parameters (easy!)
1173  *
1174  */
1175 static int ircomm_tty_control_indication(void *instance, void *sap,
1176                                          struct sk_buff *skb)
1177 {
1178         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1179         int clen;
1180
1181         IRDA_DEBUG(4, "%s()\n", __func__ );
1182
1183         IRDA_ASSERT(self != NULL, return -1;);
1184         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1185         IRDA_ASSERT(skb != NULL, return -1;);
1186
1187         clen = skb->data[0];
1188
1189         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1190                                &ircomm_param_info);
1191
1192         /* No need to kfree_skb - see ircomm_control_indication() */
1193
1194         return 0;
1195 }
1196
1197 /*
1198  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1199  *
1200  *    This function is called by IrTTP when it wants us to slow down the
1201  *    transmission of data. We just mark the hardware as stopped, and wait
1202  *    for IrTTP to notify us that things are OK again.
1203  */
1204 static void ircomm_tty_flow_indication(void *instance, void *sap,
1205                                        LOCAL_FLOW cmd)
1206 {
1207         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1208         struct tty_struct *tty;
1209
1210         IRDA_ASSERT(self != NULL, return;);
1211         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1212
1213         tty = self->tty;
1214
1215         switch (cmd) {
1216         case FLOW_START:
1217                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1218                 tty->hw_stopped = 0;
1219
1220                 /* ircomm_tty_do_softint will take care of the rest */
1221                 schedule_work(&self->tqueue);
1222                 break;
1223         default:  /* If we get here, something is very wrong, better stop */
1224         case FLOW_STOP:
1225                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1226                 tty->hw_stopped = 1;
1227                 break;
1228         }
1229         self->flow = cmd;
1230 }
1231
1232 #ifdef CONFIG_PROC_FS
1233 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1234 {
1235         char sep;
1236
1237         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1238
1239         seq_puts(m, "Service type: ");
1240         if (self->service_type & IRCOMM_9_WIRE)
1241                 seq_puts(m, "9_WIRE");
1242         else if (self->service_type & IRCOMM_3_WIRE)
1243                 seq_puts(m, "3_WIRE");
1244         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1245                 seq_puts(m, "3_WIRE_RAW");
1246         else
1247                 seq_puts(m, "No common service type!\n");
1248         seq_putc(m, '\n');
1249
1250         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1251
1252         seq_printf(m, "DTE status:");
1253         sep = ' ';
1254         if (self->settings.dte & IRCOMM_RTS) {
1255                 seq_printf(m, "%cRTS", sep);
1256                 sep = '|';
1257         }
1258         if (self->settings.dte & IRCOMM_DTR) {
1259                 seq_printf(m, "%cDTR", sep);
1260                 sep = '|';
1261         }
1262         seq_putc(m, '\n');
1263
1264         seq_puts(m, "DCE status:");
1265         sep = ' ';
1266         if (self->settings.dce & IRCOMM_CTS) {
1267                 seq_printf(m, "%cCTS", sep);
1268                 sep = '|';
1269         }
1270         if (self->settings.dce & IRCOMM_DSR) {
1271                 seq_printf(m, "%cDSR", sep);
1272                 sep = '|';
1273         }
1274         if (self->settings.dce & IRCOMM_CD) {
1275                 seq_printf(m, "%cCD", sep);
1276                 sep = '|';
1277         }
1278         if (self->settings.dce & IRCOMM_RI) {
1279                 seq_printf(m, "%cRI", sep);
1280                 sep = '|';
1281         }
1282         seq_putc(m, '\n');
1283
1284         seq_puts(m, "Configuration: ");
1285         if (!self->settings.null_modem)
1286                 seq_puts(m, "DTE <-> DCE\n");
1287         else
1288                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1289
1290         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1291
1292         seq_puts(m, "Flow control:");
1293         sep = ' ';
1294         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1295                 seq_printf(m, "%cXON_XOFF_IN", sep);
1296                 sep = '|';
1297         }
1298         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1299                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1300                 sep = '|';
1301         }
1302         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1303                 seq_printf(m, "%cRTS_CTS_IN", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1307                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1311                 seq_printf(m, "%cDSR_DTR_IN", sep);
1312                 sep = '|';
1313         }
1314         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1315                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1316                 sep = '|';
1317         }
1318         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1319                 seq_printf(m, "%cENQ_ACK_IN", sep);
1320                 sep = '|';
1321         }
1322         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1323                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1324                 sep = '|';
1325         }
1326         seq_putc(m, '\n');
1327
1328         seq_puts(m, "Flags:");
1329         sep = ' ';
1330         if (self->flags & ASYNC_CTS_FLOW) {
1331                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1332                 sep = '|';
1333         }
1334         if (self->flags & ASYNC_CHECK_CD) {
1335                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1336                 sep = '|';
1337         }
1338         if (self->flags & ASYNC_INITIALIZED) {
1339                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1340                 sep = '|';
1341         }
1342         if (self->flags & ASYNC_LOW_LATENCY) {
1343                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1344                 sep = '|';
1345         }
1346         if (self->flags & ASYNC_CLOSING) {
1347                 seq_printf(m, "%cASYNC_CLOSING", sep);
1348                 sep = '|';
1349         }
1350         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1351                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1352                 sep = '|';
1353         }
1354         seq_putc(m, '\n');
1355
1356         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1357         seq_printf(m, "Open count: %d\n", self->open_count);
1358         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1359         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1360
1361         if (self->tty)
1362                 seq_printf(m, "Hardware: %s\n",
1363                                self->tty->hw_stopped ? "Stopped" : "Running");
1364 }
1365
1366 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1367 {
1368         struct ircomm_tty_cb *self;
1369         unsigned long flags;
1370
1371         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1372
1373         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1374         while (self != NULL) {
1375                 if (self->magic != IRCOMM_TTY_MAGIC)
1376                         break;
1377
1378                 ircomm_tty_line_info(self, m);
1379                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1380         }
1381         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1382         return 0;
1383 }
1384
1385 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1386 {
1387         return single_open(file, ircomm_tty_proc_show, NULL);
1388 }
1389
1390 static const struct file_operations ircomm_tty_proc_fops = {
1391         .owner          = THIS_MODULE,
1392         .open           = ircomm_tty_proc_open,
1393         .read           = seq_read,
1394         .llseek         = seq_lseek,
1395         .release        = single_release,
1396 };
1397 #endif /* CONFIG_PROC_FS */
1398
1399 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1400 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1401 MODULE_LICENSE("GPL");
1402 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1403
1404 module_init(ircomm_tty_init);
1405 module_exit(ircomm_tty_cleanup);