Pileus Git - ~andy/linux/blob - net/irda/ircomm/ircomm_tty.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty.c
   4  * Version:       1.0
   5  * Description:   IrCOMM serial TTY driver
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 21:00:56 1999
   9  * Modified at:   Wed Feb 23 00:09:02 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
  12  *
  13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/slab.h>
  37 #include <linux/sched.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/termios.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  44
  45 #include <asm/uaccess.h>
  46
  47 #include <net/irda/irda.h>
  48 #include <net/irda/irmod.h>
  49
  50 #include <net/irda/ircomm_core.h>
  51 #include <net/irda/ircomm_param.h>
  52 #include <net/irda/ircomm_tty_attach.h>
  53 #include <net/irda/ircomm_tty.h>
  54
  55 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  56 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  57 static int  ircomm_tty_write(struct tty_struct * tty,
  58                              const unsigned char *buf, int count);
  59 static int  ircomm_tty_write_room(struct tty_struct *tty);
  60 static void ircomm_tty_throttle(struct tty_struct *tty);
  61 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  62 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  63 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  64 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  65 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  66 static void ircomm_tty_hangup(struct tty_struct *tty);
  67 static void ircomm_tty_do_softint(struct work_struct *work);
  68 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  69 static void ircomm_tty_stop(struct tty_struct *tty);
  70
  71 static int ircomm_tty_data_indication(void *instance, void *sap,
  72                                       struct sk_buff *skb);
  73 static int ircomm_tty_control_indication(void *instance, void *sap,
  74                                          struct sk_buff *skb);
  75 static void ircomm_tty_flow_indication(void *instance, void *sap,
  76                                        LOCAL_FLOW cmd);
  77 #ifdef CONFIG_PROC_FS
  78 static const struct file_operations ircomm_tty_proc_fops;
  79 #endif /* CONFIG_PROC_FS */
  80 static struct tty_driver *driver;
  81
  82 static hashbin_t *ircomm_tty = NULL;
  83
  84 static const struct tty_operations ops = {
  85         .open            = ircomm_tty_open,
  86         .close           = ircomm_tty_close,
  87         .write           = ircomm_tty_write,
  88         .write_room      = ircomm_tty_write_room,
  89         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  90         .flush_buffer    = ircomm_tty_flush_buffer,
  91         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  92         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  93         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  94         .throttle        = ircomm_tty_throttle,
  95         .unthrottle      = ircomm_tty_unthrottle,
  96         .send_xchar      = ircomm_tty_send_xchar,
  97         .set_termios     = ircomm_tty_set_termios,
  98         .stop            = ircomm_tty_stop,
  99         .start           = ircomm_tty_start,
 100         .hangup          = ircomm_tty_hangup,
 101         .wait_until_sent = ircomm_tty_wait_until_sent,
 102 #ifdef CONFIG_PROC_FS
 103         .proc_fops       = &ircomm_tty_proc_fops,
 104 #endif /* CONFIG_PROC_FS */
 105 };
 106
 107 /*
 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->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->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                 self->magic = IRCOMM_TTY_MAGIC;
 385                 self->flow = FLOW_STOP;
 386
 387                 self->line = line;
 388                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 389                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 390                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 391                 self->close_delay = 5*HZ/10;
 392                 self->closing_wait = 30*HZ;
 393
 394                 /* Init some important stuff */
 395                 init_timer(&self->watchdog_timer);
 396                 init_waitqueue_head(&self->open_wait);
 397                 init_waitqueue_head(&self->close_wait);
 398                 spin_lock_init(&self->spinlock);
 399
 400                 /*
 401                  * Force TTY into raw mode by default which is usually what
 402                  * we want for IrCOMM and IrLPT. This way applications will
 403                  * not have to twiddle with printcap etc.
 404                  *
 405                  * Note this is completely usafe and doesn't work properly
 406                  */
 407                 tty->termios->c_iflag = 0;
 408                 tty->termios->c_oflag = 0;
 409
 410                 /* Insert into hash */
 411                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 412         }
 413         /* ++ is not atomic, so this should be protected - Jean II */
 414         spin_lock_irqsave(&self->spinlock, flags);
 415         self->open_count++;
 416
 417         tty->driver_data = self;
 418         self->tty = tty;
 419         spin_unlock_irqrestore(&self->spinlock, flags);
 420
 421         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 422                    self->line, self->open_count);
 423
 424         /* Not really used by us, but lets do it anyway */
 425         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 426
 427         /*
 428          * If the port is the middle of closing, bail out now
 429          */
 430         if (tty_hung_up_p(filp) ||
 431             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 432
 433                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 434                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 435                  * IMHO it's either not needed in the first place
 436                  * or for some reason we need to make sure the async
 437                  * closing has been finished - if so, wouldn't we
 438                  * probably better sleep uninterruptible?
 439                  */
 440
 441                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 442                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 443                                      __func__);
 444                         return -ERESTARTSYS;
 445                 }
 446
 447 #ifdef SERIAL_DO_RESTART
 448                 return (self->flags & ASYNC_HUP_NOTIFY) ?
 449                         -EAGAIN : -ERESTARTSYS;
 450 #else
 451                 return -EAGAIN;
 452 #endif
 453         }
 454
 455         /* Check if this is a "normal" ircomm device, or an irlpt device */
 456         if (line < 0x10) {
 457                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 458                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 459                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 460                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 461                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 462         } else {
 463                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 464                 self->service_type = IRCOMM_3_WIRE_RAW;
 465                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 466         }
 467
 468         ret = ircomm_tty_startup(self);
 469         if (ret)
 470                 return ret;
 471
 472         ret = ircomm_tty_block_til_ready(self, filp);
 473         if (ret) {
 474                 IRDA_DEBUG(2,
 475                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 476                       ret);
 477
 478                 return ret;
 479         }
 480         return 0;
 481 }
 482
 483 /*
 484  * Function ircomm_tty_close (tty, filp)
 485  *
 486  *    This routine is called when a particular tty device is closed.
 487  *
 488  */
 489 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 490 {
 491         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 492         unsigned long flags;
 493
 494         IRDA_DEBUG(0, "%s()\n", __func__ );
 495
 496         IRDA_ASSERT(self != NULL, return;);
 497         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 498
 499         spin_lock_irqsave(&self->spinlock, flags);
 500
 501         if (tty_hung_up_p(filp)) {
 502                 spin_unlock_irqrestore(&self->spinlock, flags);
 503
 504                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 505                 return;
 506         }
 507
 508         if ((tty->count == 1) && (self->open_count != 1)) {
 509                 /*
 510                  * Uh, oh.  tty->count is 1, which means that the tty
 511                  * structure will be freed.  state->count should always
 512                  * be one in these conditions.  If it's greater than
 513                  * one, we've got real problems, since it means the
 514                  * serial port won't be shutdown.
 515                  */
 516                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 517                            "tty->count is 1, state->count is %d\n", __func__ ,
 518                            self->open_count);
 519                 self->open_count = 1;
 520         }
 521
 522         if (--self->open_count < 0) {
 523                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 524                            __func__, self->line, self->open_count);
 525                 self->open_count = 0;
 526         }
 527         if (self->open_count) {
 528                 spin_unlock_irqrestore(&self->spinlock, flags);
 529
 530                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 531                 return;
 532         }
 533
 534         /* Hum... Should be test_and_set_bit ??? - Jean II */
 535         set_bit(ASYNC_B_CLOSING, &self->flags);
 536
 537         /* We need to unlock here (we were unlocking at the end of this
 538          * function), because tty_wait_until_sent() may schedule.
 539          * I don't know if the rest should be protected somehow,
 540          * so someone should check. - Jean II */
 541         spin_unlock_irqrestore(&self->spinlock, flags);
 542
 543         /*
 544          * Now we wait for the transmit buffer to clear; and we notify
 545          * the line discipline to only process XON/XOFF characters.
 546          */
 547         tty->closing = 1;
 548         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 549                 tty_wait_until_sent_from_close(tty, self->closing_wait);
 550
 551         ircomm_tty_shutdown(self);
 552
 553         tty_driver_flush_buffer(tty);
 554         tty_ldisc_flush(tty);
 555
 556         tty->closing = 0;
 557         self->tty = NULL;
 558
 559         if (self->blocked_open) {
 560                 if (self->close_delay)
 561                         schedule_timeout_interruptible(self->close_delay);
 562                 wake_up_interruptible(&self->open_wait);
 563         }
 564
 565         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 566         wake_up_interruptible(&self->close_wait);
 567 }
 568
 569 /*
 570  * Function ircomm_tty_flush_buffer (tty)
 571  *
 572  *
 573  *
 574  */
 575 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 576 {
 577         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 578
 579         IRDA_ASSERT(self != NULL, return;);
 580         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 581
 582         /*
 583          * Let do_softint() do this to avoid race condition with
 584          * do_softint() ;-)
 585          */
 586         schedule_work(&self->tqueue);
 587 }
 588
 589 /*
 590  * Function ircomm_tty_do_softint (work)
 591  *
 592  *    We use this routine to give the write wakeup to the user at at a
 593  *    safe time (as fast as possible after write have completed). This
 594  *    can be compared to the Tx interrupt.
 595  */
 596 static void ircomm_tty_do_softint(struct work_struct *work)
 597 {
 598         struct ircomm_tty_cb *self =
 599                 container_of(work, struct ircomm_tty_cb, tqueue);
 600         struct tty_struct *tty;
 601         unsigned long flags;
 602         struct sk_buff *skb, *ctrl_skb;
 603
 604         IRDA_DEBUG(2, "%s()\n", __func__ );
 605
 606         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 607                 return;
 608
 609         tty = self->tty;
 610         if (!tty)
 611                 return;
 612
 613         /* Unlink control buffer */
 614         spin_lock_irqsave(&self->spinlock, flags);
 615
 616         ctrl_skb = self->ctrl_skb;
 617         self->ctrl_skb = NULL;
 618
 619         spin_unlock_irqrestore(&self->spinlock, flags);
 620
 621         /* Flush control buffer if any */
 622         if(ctrl_skb) {
 623                 if(self->flow == FLOW_START)
 624                         ircomm_control_request(self->ircomm, ctrl_skb);
 625                 /* Drop reference count - see ircomm_ttp_data_request(). */
 626                 dev_kfree_skb(ctrl_skb);
 627         }
 628
 629         if (tty->hw_stopped)
 630                 return;
 631
 632         /* Unlink transmit buffer */
 633         spin_lock_irqsave(&self->spinlock, flags);
 634
 635         skb = self->tx_skb;
 636         self->tx_skb = NULL;
 637
 638         spin_unlock_irqrestore(&self->spinlock, flags);
 639
 640         /* Flush transmit buffer if any */
 641         if (skb) {
 642                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 643                 /* Drop reference count - see ircomm_ttp_data_request(). */
 644                 dev_kfree_skb(skb);
 645         }
 646
 647         /* Check if user (still) wants to be waken up */
 648         tty_wakeup(tty);
 649 }
 650
 651 /*
 652  * Function ircomm_tty_write (tty, buf, count)
 653  *
 654  *    This routine is called by the kernel to write a series of characters
 655  *    to the tty device. The characters may come from user space or kernel
 656  *    space. This routine will return the number of characters actually
 657  *    accepted for writing. This routine is mandatory.
 658  */
 659 static int ircomm_tty_write(struct tty_struct *tty,
 660                             const unsigned char *buf, int count)
 661 {
 662         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 663         unsigned long flags;
 664         struct sk_buff *skb;
 665         int tailroom = 0;
 666         int len = 0;
 667         int size;
 668
 669         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 670                    tty->hw_stopped);
 671
 672         IRDA_ASSERT(self != NULL, return -1;);
 673         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 674
 675         /* We may receive packets from the TTY even before we have finished
 676          * our setup. Not cool.
 677          * The problem is that we don't know the final header and data size
 678          * to create the proper skb, so any skb we would create would have
 679          * bogus header and data size, so need care.
 680          * We use a bogus header size to safely detect this condition.
 681          * Another problem is that hw_stopped was set to 0 way before it
 682          * should be, so we would drop this skb. It should now be fixed.
 683          * One option is to not accept data until we are properly setup.
 684          * But, I suspect that when it happens, the ppp line discipline
 685          * just "drops" the data, which might screw up connect scripts.
 686          * The second option is to create a "safe skb", with large header
 687          * and small size (see ircomm_tty_open() for values).
 688          * We just need to make sure that when the real values get filled,
 689          * we don't mess up the original "safe skb" (see tx_data_size).
 690          * Jean II */
 691         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 692                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 693 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 694                 /* We didn't consume anything, TTY will retry */
 695                 return 0;
 696 #endif
 697         }
 698
 699         if (count < 1)
 700                 return 0;
 701
 702         /* Protect our manipulation of self->tx_skb and related */
 703         spin_lock_irqsave(&self->spinlock, flags);
 704
 705         /* Fetch current transmit buffer */
 706         skb = self->tx_skb;
 707
 708         /*
 709          * Send out all the data we get, possibly as multiple fragmented
 710          * frames, but this will only happen if the data is larger than the
 711          * max data size. The normal case however is just the opposite, and
 712          * this function may be called multiple times, and will then actually
 713          * defragment the data and send it out as one packet as soon as
 714          * possible, but at a safer point in time
 715          */
 716         while (count) {
 717                 size = count;
 718
 719                 /* Adjust data size to the max data size */
 720                 if (size > self->max_data_size)
 721                         size = self->max_data_size;
 722
 723                 /*
 724                  * Do we already have a buffer ready for transmit, or do
 725                  * we need to allocate a new frame
 726                  */
 727                 if (skb) {
 728                         /*
 729                          * Any room for more data at the end of the current
 730                          * transmit buffer? Cannot use skb_tailroom, since
 731                          * dev_alloc_skb gives us a larger skb than we
 732                          * requested
 733                          * Note : use tx_data_size, because max_data_size
 734                          * may have changed and we don't want to overwrite
 735                          * the skb. - Jean II
 736                          */
 737                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 738                                 /* Adjust data to tailroom */
 739                                 if (size > tailroom)
 740                                         size = tailroom;
 741                         } else {
 742                                 /*
 743                                  * Current transmit frame is full, so break
 744                                  * out, so we can send it as soon as possible
 745                                  */
 746                                 break;
 747                         }
 748                 } else {
 749                         /* Prepare a full sized frame */
 750                         skb = alloc_skb(self->max_data_size+
 751                                         self->max_header_size,
 752                                         GFP_ATOMIC);
 753                         if (!skb) {
 754                                 spin_unlock_irqrestore(&self->spinlock, flags);
 755                                 return -ENOBUFS;
 756                         }
 757                         skb_reserve(skb, self->max_header_size);
 758                         self->tx_skb = skb;
 759                         /* Remember skb size because max_data_size may
 760                          * change later on - Jean II */
 761                         self->tx_data_size = self->max_data_size;
 762                 }
 763
 764                 /* Copy data */
 765                 memcpy(skb_put(skb,size), buf + len, size);
 766
 767                 count -= size;
 768                 len += size;
 769         }
 770
 771         spin_unlock_irqrestore(&self->spinlock, flags);
 772
 773         /*
 774          * Schedule a new thread which will transmit the frame as soon
 775          * as possible, but at a safe point in time. We do this so the
 776          * "user" can give us data multiple times, as PPP does (because of
 777          * its 256 byte tx buffer). We will then defragment and send out
 778          * all this data as one single packet.
 779          */
 780         schedule_work(&self->tqueue);
 781
 782         return len;
 783 }
 784
 785 /*
 786  * Function ircomm_tty_write_room (tty)
 787  *
 788  *    This routine returns the numbers of characters the tty driver will
 789  *    accept for queuing to be written. This number is subject to change as
 790  *    output buffers get emptied, or if the output flow control is acted.
 791  */
 792 static int ircomm_tty_write_room(struct tty_struct *tty)
 793 {
 794         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 795         unsigned long flags;
 796         int ret;
 797
 798         IRDA_ASSERT(self != NULL, return -1;);
 799         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 800
 801 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 802         /* max_header_size tells us if the channel is initialised or not. */
 803         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 804                 /* Don't bother us yet */
 805                 return 0;
 806 #endif
 807
 808         /* Check if we are allowed to transmit any data.
 809          * hw_stopped is the regular flow control.
 810          * Jean II */
 811         if (tty->hw_stopped)
 812                 ret = 0;
 813         else {
 814                 spin_lock_irqsave(&self->spinlock, flags);
 815                 if (self->tx_skb)
 816                         ret = self->tx_data_size - self->tx_skb->len;
 817                 else
 818                         ret = self->max_data_size;
 819                 spin_unlock_irqrestore(&self->spinlock, flags);
 820         }
 821         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 822
 823         return ret;
 824 }
 825
 826 /*
 827  * Function ircomm_tty_wait_until_sent (tty, timeout)
 828  *
 829  *    This routine waits until the device has written out all of the
 830  *    characters in its transmitter FIFO.
 831  */
 832 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 833 {
 834         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 835         unsigned long orig_jiffies, poll_time;
 836         unsigned long flags;
 837
 838         IRDA_DEBUG(2, "%s()\n", __func__ );
 839
 840         IRDA_ASSERT(self != NULL, return;);
 841         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 842
 843         orig_jiffies = jiffies;
 844
 845         /* Set poll time to 200 ms */
 846         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 847
 848         spin_lock_irqsave(&self->spinlock, flags);
 849         while (self->tx_skb && self->tx_skb->len) {
 850                 spin_unlock_irqrestore(&self->spinlock, flags);
 851                 schedule_timeout_interruptible(poll_time);
 852                 spin_lock_irqsave(&self->spinlock, flags);
 853                 if (signal_pending(current))
 854                         break;
 855                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 856                         break;
 857         }
 858         spin_unlock_irqrestore(&self->spinlock, flags);
 859         current->state = TASK_RUNNING;
 860 }
 861
 862 /*
 863  * Function ircomm_tty_throttle (tty)
 864  *
 865  *    This routine notifies the tty driver that input buffers for the line
 866  *    discipline are close to full, and it should somehow signal that no
 867  *    more characters should be sent to the tty.
 868  */
 869 static void ircomm_tty_throttle(struct tty_struct *tty)
 870 {
 871         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 872
 873         IRDA_DEBUG(2, "%s()\n", __func__ );
 874
 875         IRDA_ASSERT(self != NULL, return;);
 876         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 877
 878         /* Software flow control? */
 879         if (I_IXOFF(tty))
 880                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 881
 882         /* Hardware flow control? */
 883         if (tty->termios->c_cflag & CRTSCTS) {
 884                 self->settings.dte &= ~IRCOMM_RTS;
 885                 self->settings.dte |= IRCOMM_DELTA_RTS;
 886
 887                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 888         }
 889
 890         ircomm_flow_request(self->ircomm, FLOW_STOP);
 891 }
 892
 893 /*
 894  * Function ircomm_tty_unthrottle (tty)
 895  *
 896  *    This routine notifies the tty drivers that it should signals that
 897  *    characters can now be sent to the tty without fear of overrunning the
 898  *    input buffers of the line disciplines.
 899  */
 900 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 901 {
 902         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 903
 904         IRDA_DEBUG(2, "%s()\n", __func__ );
 905
 906         IRDA_ASSERT(self != NULL, return;);
 907         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 908
 909         /* Using software flow control? */
 910         if (I_IXOFF(tty)) {
 911                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 912         }
 913
 914         /* Using hardware flow control? */
 915         if (tty->termios->c_cflag & CRTSCTS) {
 916                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 917
 918                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 919                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 920         }
 921         ircomm_flow_request(self->ircomm, FLOW_START);
 922 }
 923
 924 /*
 925  * Function ircomm_tty_chars_in_buffer (tty)
 926  *
 927  *    Indicates if there are any data in the buffer
 928  *
 929  */
 930 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 931 {
 932         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 933         unsigned long flags;
 934         int len = 0;
 935
 936         IRDA_ASSERT(self != NULL, return -1;);
 937         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 938
 939         spin_lock_irqsave(&self->spinlock, flags);
 940
 941         if (self->tx_skb)
 942                 len = self->tx_skb->len;
 943
 944         spin_unlock_irqrestore(&self->spinlock, flags);
 945
 946         return len;
 947 }
 948
 949 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 950 {
 951         unsigned long flags;
 952
 953         IRDA_ASSERT(self != NULL, return;);
 954         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 955
 956         IRDA_DEBUG(0, "%s()\n", __func__ );
 957
 958         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 959                 return;
 960
 961         ircomm_tty_detach_cable(self);
 962
 963         spin_lock_irqsave(&self->spinlock, flags);
 964
 965         del_timer(&self->watchdog_timer);
 966
 967         /* Free parameter buffer */
 968         if (self->ctrl_skb) {
 969                 dev_kfree_skb(self->ctrl_skb);
 970                 self->ctrl_skb = NULL;
 971         }
 972
 973         /* Free transmit buffer */
 974         if (self->tx_skb) {
 975                 dev_kfree_skb(self->tx_skb);
 976                 self->tx_skb = NULL;
 977         }
 978
 979         if (self->ircomm) {
 980                 ircomm_close(self->ircomm);
 981                 self->ircomm = NULL;
 982         }
 983
 984         spin_unlock_irqrestore(&self->spinlock, flags);
 985 }
 986
 987 /*
 988  * Function ircomm_tty_hangup (tty)
 989  *
 990  *    This routine notifies the tty driver that it should hangup the tty
 991  *    device.
 992  *
 993  */
 994 static void ircomm_tty_hangup(struct tty_struct *tty)
 995 {
 996         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 997         unsigned long   flags;
 998
 999         IRDA_DEBUG(0, "%s()\n", __func__ );
1000
1001         IRDA_ASSERT(self != NULL, return;);
1002         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1003
1004         /* ircomm_tty_flush_buffer(tty); */
1005         ircomm_tty_shutdown(self);
1006
1007         /* I guess we need to lock here - Jean II */
1008         spin_lock_irqsave(&self->spinlock, flags);
1009         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1010         self->tty = NULL;
1011         self->open_count = 0;
1012         spin_unlock_irqrestore(&self->spinlock, flags);
1013
1014         wake_up_interruptible(&self->open_wait);
1015 }
1016
1017 /*
1018  * Function ircomm_tty_send_xchar (tty, ch)
1019  *
1020  *    This routine is used to send a high-priority XON/XOFF character to
1021  *    the device.
1022  */
1023 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1024 {
1025         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1026 }
1027
1028 /*
1029  * Function ircomm_tty_start (tty)
1030  *
1031  *    This routine notifies the tty driver that it resume sending
1032  *    characters to the tty device.
1033  */
1034 void ircomm_tty_start(struct tty_struct *tty)
1035 {
1036         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1037
1038         ircomm_flow_request(self->ircomm, FLOW_START);
1039 }
1040
1041 /*
1042  * Function ircomm_tty_stop (tty)
1043  *
1044  *     This routine notifies the tty driver that it should stop outputting
1045  *     characters to the tty device.
1046  */
1047 static void ircomm_tty_stop(struct tty_struct *tty)
1048 {
1049         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1050
1051         IRDA_ASSERT(self != NULL, return;);
1052         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1053
1054         ircomm_flow_request(self->ircomm, FLOW_STOP);
1055 }
1056
1057 /*
1058  * Function ircomm_check_modem_status (self)
1059  *
1060  *    Check for any changes in the DCE's line settings. This function should
1061  *    be called whenever the dce parameter settings changes, to update the
1062  *    flow control settings and other things
1063  */
1064 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1065 {
1066         struct tty_struct *tty;
1067         int status;
1068
1069         IRDA_DEBUG(0, "%s()\n", __func__ );
1070
1071         IRDA_ASSERT(self != NULL, return;);
1072         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1073
1074         tty = self->tty;
1075
1076         status = self->settings.dce;
1077
1078         if (status & IRCOMM_DCE_DELTA_ANY) {
1079                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1080         }
1081         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1082                 IRDA_DEBUG(2,
1083                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1084                            (status & IRCOMM_CD) ? "on" : "off");
1085
1086                 if (status & IRCOMM_CD) {
1087                         wake_up_interruptible(&self->open_wait);
1088                 } else {
1089                         IRDA_DEBUG(2,
1090                                    "%s(), Doing serial hangup..\n", __func__ );
1091                         if (tty)
1092                                 tty_hangup(tty);
1093
1094                         /* Hangup will remote the tty, so better break out */
1095                         return;
1096                 }
1097         }
1098         if (self->flags & ASYNC_CTS_FLOW) {
1099                 if (tty->hw_stopped) {
1100                         if (status & IRCOMM_CTS) {
1101                                 IRDA_DEBUG(2,
1102                                            "%s(), CTS tx start...\n", __func__ );
1103                                 tty->hw_stopped = 0;
1104
1105                                 /* Wake up processes blocked on open */
1106                                 wake_up_interruptible(&self->open_wait);
1107
1108                                 schedule_work(&self->tqueue);
1109                                 return;
1110                         }
1111                 } else {
1112                         if (!(status & IRCOMM_CTS)) {
1113                                 IRDA_DEBUG(2,
1114                                            "%s(), CTS tx stop...\n", __func__ );
1115                                 tty->hw_stopped = 1;
1116                         }
1117                 }
1118         }
1119 }
1120
1121 /*
1122  * Function ircomm_tty_data_indication (instance, sap, skb)
1123  *
1124  *    Handle incoming data, and deliver it to the line discipline
1125  *
1126  */
1127 static int ircomm_tty_data_indication(void *instance, void *sap,
1128                                       struct sk_buff *skb)
1129 {
1130         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1131
1132         IRDA_DEBUG(2, "%s()\n", __func__ );
1133
1134         IRDA_ASSERT(self != NULL, return -1;);
1135         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1136         IRDA_ASSERT(skb != NULL, return -1;);
1137
1138         if (!self->tty) {
1139                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1140                 return 0;
1141         }
1142
1143         /*
1144          * If we receive data when hardware is stopped then something is wrong.
1145          * We try to poll the peers line settings to check if we are up todate.
1146          * Devices like WinCE can do this, and since they don't send any
1147          * params, we can just as well declare the hardware for running.
1148          */
1149         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1150                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1151                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1152
1153                 /* We can just as well declare the hardware for running */
1154                 ircomm_tty_send_initial_parameters(self);
1155                 ircomm_tty_link_established(self);
1156         }
1157
1158         /*
1159          * Use flip buffer functions since the code may be called from interrupt
1160          * context
1161          */
1162         tty_insert_flip_string(self->tty, skb->data, skb->len);
1163         tty_flip_buffer_push(self->tty);
1164
1165         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1166
1167         return 0;
1168 }
1169
1170 /*
1171  * Function ircomm_tty_control_indication (instance, sap, skb)
1172  *
1173  *    Parse all incoming parameters (easy!)
1174  *
1175  */
1176 static int ircomm_tty_control_indication(void *instance, void *sap,
1177                                          struct sk_buff *skb)
1178 {
1179         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1180         int clen;
1181
1182         IRDA_DEBUG(4, "%s()\n", __func__ );
1183
1184         IRDA_ASSERT(self != NULL, return -1;);
1185         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1186         IRDA_ASSERT(skb != NULL, return -1;);
1187
1188         clen = skb->data[0];
1189
1190         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1191                                &ircomm_param_info);
1192
1193         /* No need to kfree_skb - see ircomm_control_indication() */
1194
1195         return 0;
1196 }
1197
1198 /*
1199  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1200  *
1201  *    This function is called by IrTTP when it wants us to slow down the
1202  *    transmission of data. We just mark the hardware as stopped, and wait
1203  *    for IrTTP to notify us that things are OK again.
1204  */
1205 static void ircomm_tty_flow_indication(void *instance, void *sap,
1206                                        LOCAL_FLOW cmd)
1207 {
1208         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1209         struct tty_struct *tty;
1210
1211         IRDA_ASSERT(self != NULL, return;);
1212         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1213
1214         tty = self->tty;
1215
1216         switch (cmd) {
1217         case FLOW_START:
1218                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1219                 tty->hw_stopped = 0;
1220
1221                 /* ircomm_tty_do_softint will take care of the rest */
1222                 schedule_work(&self->tqueue);
1223                 break;
1224         default:  /* If we get here, something is very wrong, better stop */
1225         case FLOW_STOP:
1226                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1227                 tty->hw_stopped = 1;
1228                 break;
1229         }
1230         self->flow = cmd;
1231 }
1232
1233 #ifdef CONFIG_PROC_FS
1234 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1235 {
1236         char sep;
1237
1238         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1239
1240         seq_puts(m, "Service type: ");
1241         if (self->service_type & IRCOMM_9_WIRE)
1242                 seq_puts(m, "9_WIRE");
1243         else if (self->service_type & IRCOMM_3_WIRE)
1244                 seq_puts(m, "3_WIRE");
1245         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1246                 seq_puts(m, "3_WIRE_RAW");
1247         else
1248                 seq_puts(m, "No common service type!\n");
1249         seq_putc(m, '\n');
1250
1251         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1252
1253         seq_printf(m, "DTE status:");
1254         sep = ' ';
1255         if (self->settings.dte & IRCOMM_RTS) {
1256                 seq_printf(m, "%cRTS", sep);
1257                 sep = '|';
1258         }
1259         if (self->settings.dte & IRCOMM_DTR) {
1260                 seq_printf(m, "%cDTR", sep);
1261                 sep = '|';
1262         }
1263         seq_putc(m, '\n');
1264
1265         seq_puts(m, "DCE status:");
1266         sep = ' ';
1267         if (self->settings.dce & IRCOMM_CTS) {
1268                 seq_printf(m, "%cCTS", sep);
1269                 sep = '|';
1270         }
1271         if (self->settings.dce & IRCOMM_DSR) {
1272                 seq_printf(m, "%cDSR", sep);
1273                 sep = '|';
1274         }
1275         if (self->settings.dce & IRCOMM_CD) {
1276                 seq_printf(m, "%cCD", sep);
1277                 sep = '|';
1278         }
1279         if (self->settings.dce & IRCOMM_RI) {
1280                 seq_printf(m, "%cRI", sep);
1281                 sep = '|';
1282         }
1283         seq_putc(m, '\n');
1284
1285         seq_puts(m, "Configuration: ");
1286         if (!self->settings.null_modem)
1287                 seq_puts(m, "DTE <-> DCE\n");
1288         else
1289                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1290
1291         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1292
1293         seq_puts(m, "Flow control:");
1294         sep = ' ';
1295         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1296                 seq_printf(m, "%cXON_XOFF_IN", sep);
1297                 sep = '|';
1298         }
1299         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1300                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1301                 sep = '|';
1302         }
1303         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1304                 seq_printf(m, "%cRTS_CTS_IN", sep);
1305                 sep = '|';
1306         }
1307         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1308                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1309                 sep = '|';
1310         }
1311         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1312                 seq_printf(m, "%cDSR_DTR_IN", sep);
1313                 sep = '|';
1314         }
1315         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1316                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1317                 sep = '|';
1318         }
1319         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1320                 seq_printf(m, "%cENQ_ACK_IN", sep);
1321                 sep = '|';
1322         }
1323         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1324                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1325                 sep = '|';
1326         }
1327         seq_putc(m, '\n');
1328
1329         seq_puts(m, "Flags:");
1330         sep = ' ';
1331         if (self->flags & ASYNC_CTS_FLOW) {
1332                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1333                 sep = '|';
1334         }
1335         if (self->flags & ASYNC_CHECK_CD) {
1336                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1337                 sep = '|';
1338         }
1339         if (self->flags & ASYNC_INITIALIZED) {
1340                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1341                 sep = '|';
1342         }
1343         if (self->flags & ASYNC_LOW_LATENCY) {
1344                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1345                 sep = '|';
1346         }
1347         if (self->flags & ASYNC_CLOSING) {
1348                 seq_printf(m, "%cASYNC_CLOSING", sep);
1349                 sep = '|';
1350         }
1351         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1352                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1353                 sep = '|';
1354         }
1355         seq_putc(m, '\n');
1356
1357         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1358         seq_printf(m, "Open count: %d\n", self->open_count);
1359         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1360         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1361
1362         if (self->tty)
1363                 seq_printf(m, "Hardware: %s\n",
1364                                self->tty->hw_stopped ? "Stopped" : "Running");
1365 }
1366
1367 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1368 {
1369         struct ircomm_tty_cb *self;
1370         unsigned long flags;
1371
1372         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1373
1374         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1375         while (self != NULL) {
1376                 if (self->magic != IRCOMM_TTY_MAGIC)
1377                         break;
1378
1379                 ircomm_tty_line_info(self, m);
1380                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1381         }
1382         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1383         return 0;
1384 }
1385
1386 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1387 {
1388         return single_open(file, ircomm_tty_proc_show, NULL);
1389 }
1390
1391 static const struct file_operations ircomm_tty_proc_fops = {
1392         .owner          = THIS_MODULE,
1393         .open           = ircomm_tty_proc_open,
1394         .read           = seq_read,
1395         .llseek         = seq_lseek,
1396         .release        = single_release,
1397 };
1398 #endif /* CONFIG_PROC_FS */
1399
1400 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1401 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1402 MODULE_LICENSE("GPL");
1403 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1404
1405 module_init(ircomm_tty_init);
1406 module_exit(ircomm_tty_cleanup);