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/interrupt.h>
  42 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  43
  44 #include <asm/uaccess.h>
  45
  46 #include <net/irda/irda.h>
  47 #include <net/irda/irmod.h>
  48
  49 #include <net/irda/ircomm_core.h>
  50 #include <net/irda/ircomm_param.h>
  51 #include <net/irda/ircomm_tty_attach.h>
  52 #include <net/irda/ircomm_tty.h>
  53
  54 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  55 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  56 static int  ircomm_tty_write(struct tty_struct * tty,
  57                              const unsigned char *buf, int count);
  58 static int  ircomm_tty_write_room(struct tty_struct *tty);
  59 static void ircomm_tty_throttle(struct tty_struct *tty);
  60 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  61 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  62 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  63 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  64 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  65 static void ircomm_tty_hangup(struct tty_struct *tty);
  66 static void ircomm_tty_do_softint(struct work_struct *work);
  67 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  68 static void ircomm_tty_stop(struct tty_struct *tty);
  69
  70 static int ircomm_tty_data_indication(void *instance, void *sap,
  71                                       struct sk_buff *skb);
  72 static int ircomm_tty_control_indication(void *instance, void *sap,
  73                                          struct sk_buff *skb);
  74 static void ircomm_tty_flow_indication(void *instance, void *sap,
  75                                        LOCAL_FLOW cmd);
  76 #ifdef CONFIG_PROC_FS
  77 static const struct file_operations ircomm_tty_proc_fops;
  78 #endif /* CONFIG_PROC_FS */
  79 static struct tty_driver *driver;
  80
  81 static hashbin_t *ircomm_tty = NULL;
  82
  83 static const struct tty_operations ops = {
  84         .open            = ircomm_tty_open,
  85         .close           = ircomm_tty_close,
  86         .write           = ircomm_tty_write,
  87         .write_room      = ircomm_tty_write_room,
  88         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  89         .flush_buffer    = ircomm_tty_flush_buffer,
  90         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  91         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  92         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  93         .throttle        = ircomm_tty_throttle,
  94         .unthrottle      = ircomm_tty_unthrottle,
  95         .send_xchar      = ircomm_tty_send_xchar,
  96         .set_termios     = ircomm_tty_set_termios,
  97         .stop            = ircomm_tty_stop,
  98         .start           = ircomm_tty_start,
  99         .hangup          = ircomm_tty_hangup,
 100         .wait_until_sent = ircomm_tty_wait_until_sent,
 101 #ifdef CONFIG_PROC_FS
 102         .proc_fops       = &ircomm_tty_proc_fops,
 103 #endif /* CONFIG_PROC_FS */
 104 };
 105
 106 /*
 107  * Function ircomm_tty_init()
 108  *
 109  *    Init IrCOMM TTY layer/driver
 110  *
 111  */
 112 static int __init ircomm_tty_init(void)
 113 {
 114         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 115         if (!driver)
 116                 return -ENOMEM;
 117         ircomm_tty = hashbin_new(HB_LOCK);
 118         if (ircomm_tty == NULL) {
 119                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 120                 put_tty_driver(driver);
 121                 return -ENOMEM;
 122         }
 123
 124         driver->owner           = THIS_MODULE;
 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;
 369         unsigned long   flags;
 370         int ret;
 371
 372         IRDA_DEBUG(2, "%s()\n", __func__ );
 373
 374         line = tty->index;
 375         if (line >= IRCOMM_TTY_PORTS)
 376                 return -ENODEV;
 377
 378         /* Check if instance already exists */
 379         self = hashbin_lock_find(ircomm_tty, line, NULL);
 380         if (!self) {
 381                 /* No, so make new instance */
 382                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 383                 if (self == NULL) {
 384                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 385                         return -ENOMEM;
 386                 }
 387
 388                 self->magic = IRCOMM_TTY_MAGIC;
 389                 self->flow = FLOW_STOP;
 390
 391                 self->line = line;
 392                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 393                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 394                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 395                 self->close_delay = 5*HZ/10;
 396                 self->closing_wait = 30*HZ;
 397
 398                 /* Init some important stuff */
 399                 init_timer(&self->watchdog_timer);
 400                 init_waitqueue_head(&self->open_wait);
 401                 init_waitqueue_head(&self->close_wait);
 402                 spin_lock_init(&self->spinlock);
 403
 404                 /*
 405                  * Force TTY into raw mode by default which is usually what
 406                  * we want for IrCOMM and IrLPT. This way applications will
 407                  * not have to twiddle with printcap etc.
 408                  *
 409                  * Note this is completely usafe and doesn't work properly
 410                  */
 411                 tty->termios->c_iflag = 0;
 412                 tty->termios->c_oflag = 0;
 413
 414                 /* Insert into hash */
 415                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 416         }
 417         /* ++ is not atomic, so this should be protected - Jean II */
 418         spin_lock_irqsave(&self->spinlock, flags);
 419         self->open_count++;
 420
 421         tty->driver_data = self;
 422         self->tty = tty;
 423         spin_unlock_irqrestore(&self->spinlock, flags);
 424
 425         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 426                    self->line, self->open_count);
 427
 428         /* Not really used by us, but lets do it anyway */
 429         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 430
 431         /*
 432          * If the port is the middle of closing, bail out now
 433          */
 434         if (tty_hung_up_p(filp) ||
 435             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 436
 437                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 438                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 439                  * IMHO it's either not needed in the first place
 440                  * or for some reason we need to make sure the async
 441                  * closing has been finished - if so, wouldn't we
 442                  * probably better sleep uninterruptible?
 443                  */
 444
 445                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 446                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 447                                      __func__);
 448                         return -ERESTARTSYS;
 449                 }
 450
 451 #ifdef SERIAL_DO_RESTART
 452                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
 453                         -EAGAIN : -ERESTARTSYS);
 454 #else
 455                 return -EAGAIN;
 456 #endif
 457         }
 458
 459         /* Check if this is a "normal" ircomm device, or an irlpt device */
 460         if (line < 0x10) {
 461                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 462                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 463                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 464                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 465                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 466         } else {
 467                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 468                 self->service_type = IRCOMM_3_WIRE_RAW;
 469                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 470         }
 471
 472         ret = ircomm_tty_startup(self);
 473         if (ret)
 474                 return ret;
 475
 476         ret = ircomm_tty_block_til_ready(self, filp);
 477         if (ret) {
 478                 IRDA_DEBUG(2,
 479                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 480                       ret);
 481
 482                 return ret;
 483         }
 484         return 0;
 485 }
 486
 487 /*
 488  * Function ircomm_tty_close (tty, filp)
 489  *
 490  *    This routine is called when a particular tty device is closed.
 491  *
 492  */
 493 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 494 {
 495         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 496         unsigned long flags;
 497
 498         IRDA_DEBUG(0, "%s()\n", __func__ );
 499
 500         IRDA_ASSERT(self != NULL, return;);
 501         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 502
 503         spin_lock_irqsave(&self->spinlock, flags);
 504
 505         if (tty_hung_up_p(filp)) {
 506                 spin_unlock_irqrestore(&self->spinlock, flags);
 507
 508                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 509                 return;
 510         }
 511
 512         if ((tty->count == 1) && (self->open_count != 1)) {
 513                 /*
 514                  * Uh, oh.  tty->count is 1, which means that the tty
 515                  * structure will be freed.  state->count should always
 516                  * be one in these conditions.  If it's greater than
 517                  * one, we've got real problems, since it means the
 518                  * serial port won't be shutdown.
 519                  */
 520                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 521                            "tty->count is 1, state->count is %d\n", __func__ ,
 522                            self->open_count);
 523                 self->open_count = 1;
 524         }
 525
 526         if (--self->open_count < 0) {
 527                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 528                            __func__, self->line, self->open_count);
 529                 self->open_count = 0;
 530         }
 531         if (self->open_count) {
 532                 spin_unlock_irqrestore(&self->spinlock, flags);
 533
 534                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 535                 return;
 536         }
 537
 538         /* Hum... Should be test_and_set_bit ??? - Jean II */
 539         set_bit(ASYNC_B_CLOSING, &self->flags);
 540
 541         /* We need to unlock here (we were unlocking at the end of this
 542          * function), because tty_wait_until_sent() may schedule.
 543          * I don't know if the rest should be protected somehow,
 544          * so someone should check. - Jean II */
 545         spin_unlock_irqrestore(&self->spinlock, flags);
 546
 547         /*
 548          * Now we wait for the transmit buffer to clear; and we notify
 549          * the line discipline to only process XON/XOFF characters.
 550          */
 551         tty->closing = 1;
 552         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 553                 tty_wait_until_sent(tty, self->closing_wait);
 554
 555         ircomm_tty_shutdown(self);
 556
 557         tty_driver_flush_buffer(tty);
 558         tty_ldisc_flush(tty);
 559
 560         tty->closing = 0;
 561         self->tty = NULL;
 562
 563         if (self->blocked_open) {
 564                 if (self->close_delay)
 565                         schedule_timeout_interruptible(self->close_delay);
 566                 wake_up_interruptible(&self->open_wait);
 567         }
 568
 569         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 570         wake_up_interruptible(&self->close_wait);
 571 }
 572
 573 /*
 574  * Function ircomm_tty_flush_buffer (tty)
 575  *
 576  *
 577  *
 578  */
 579 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 580 {
 581         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 582
 583         IRDA_ASSERT(self != NULL, return;);
 584         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 585
 586         /*
 587          * Let do_softint() do this to avoid race condition with
 588          * do_softint() ;-)
 589          */
 590         schedule_work(&self->tqueue);
 591 }
 592
 593 /*
 594  * Function ircomm_tty_do_softint (work)
 595  *
 596  *    We use this routine to give the write wakeup to the user at at a
 597  *    safe time (as fast as possible after write have completed). This
 598  *    can be compared to the Tx interrupt.
 599  */
 600 static void ircomm_tty_do_softint(struct work_struct *work)
 601 {
 602         struct ircomm_tty_cb *self =
 603                 container_of(work, struct ircomm_tty_cb, tqueue);
 604         struct tty_struct *tty;
 605         unsigned long flags;
 606         struct sk_buff *skb, *ctrl_skb;
 607
 608         IRDA_DEBUG(2, "%s()\n", __func__ );
 609
 610         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 611                 return;
 612
 613         tty = self->tty;
 614         if (!tty)
 615                 return;
 616
 617         /* Unlink control buffer */
 618         spin_lock_irqsave(&self->spinlock, flags);
 619
 620         ctrl_skb = self->ctrl_skb;
 621         self->ctrl_skb = NULL;
 622
 623         spin_unlock_irqrestore(&self->spinlock, flags);
 624
 625         /* Flush control buffer if any */
 626         if(ctrl_skb) {
 627                 if(self->flow == FLOW_START)
 628                         ircomm_control_request(self->ircomm, ctrl_skb);
 629                 /* Drop reference count - see ircomm_ttp_data_request(). */
 630                 dev_kfree_skb(ctrl_skb);
 631         }
 632
 633         if (tty->hw_stopped)
 634                 return;
 635
 636         /* Unlink transmit buffer */
 637         spin_lock_irqsave(&self->spinlock, flags);
 638
 639         skb = self->tx_skb;
 640         self->tx_skb = NULL;
 641
 642         spin_unlock_irqrestore(&self->spinlock, flags);
 643
 644         /* Flush transmit buffer if any */
 645         if (skb) {
 646                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 647                 /* Drop reference count - see ircomm_ttp_data_request(). */
 648                 dev_kfree_skb(skb);
 649         }
 650
 651         /* Check if user (still) wants to be waken up */
 652         tty_wakeup(tty);
 653 }
 654
 655 /*
 656  * Function ircomm_tty_write (tty, buf, count)
 657  *
 658  *    This routine is called by the kernel to write a series of characters
 659  *    to the tty device. The characters may come from user space or kernel
 660  *    space. This routine will return the number of characters actually
 661  *    accepted for writing. This routine is mandatory.
 662  */
 663 static int ircomm_tty_write(struct tty_struct *tty,
 664                             const unsigned char *buf, int count)
 665 {
 666         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 667         unsigned long flags;
 668         struct sk_buff *skb;
 669         int tailroom = 0;
 670         int len = 0;
 671         int size;
 672
 673         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 674                    tty->hw_stopped);
 675
 676         IRDA_ASSERT(self != NULL, return -1;);
 677         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 678
 679         /* We may receive packets from the TTY even before we have finished
 680          * our setup. Not cool.
 681          * The problem is that we don't know the final header and data size
 682          * to create the proper skb, so any skb we would create would have
 683          * bogus header and data size, so need care.
 684          * We use a bogus header size to safely detect this condition.
 685          * Another problem is that hw_stopped was set to 0 way before it
 686          * should be, so we would drop this skb. It should now be fixed.
 687          * One option is to not accept data until we are properly setup.
 688          * But, I suspect that when it happens, the ppp line discipline
 689          * just "drops" the data, which might screw up connect scripts.
 690          * The second option is to create a "safe skb", with large header
 691          * and small size (see ircomm_tty_open() for values).
 692          * We just need to make sure that when the real values get filled,
 693          * we don't mess up the original "safe skb" (see tx_data_size).
 694          * Jean II */
 695         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 696                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 697 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 698                 /* We didn't consume anything, TTY will retry */
 699                 return 0;
 700 #endif
 701         }
 702
 703         if (count < 1)
 704                 return 0;
 705
 706         /* Protect our manipulation of self->tx_skb and related */
 707         spin_lock_irqsave(&self->spinlock, flags);
 708
 709         /* Fetch current transmit buffer */
 710         skb = self->tx_skb;
 711
 712         /*
 713          * Send out all the data we get, possibly as multiple fragmented
 714          * frames, but this will only happen if the data is larger than the
 715          * max data size. The normal case however is just the opposite, and
 716          * this function may be called multiple times, and will then actually
 717          * defragment the data and send it out as one packet as soon as
 718          * possible, but at a safer point in time
 719          */
 720         while (count) {
 721                 size = count;
 722
 723                 /* Adjust data size to the max data size */
 724                 if (size > self->max_data_size)
 725                         size = self->max_data_size;
 726
 727                 /*
 728                  * Do we already have a buffer ready for transmit, or do
 729                  * we need to allocate a new frame
 730                  */
 731                 if (skb) {
 732                         /*
 733                          * Any room for more data at the end of the current
 734                          * transmit buffer? Cannot use skb_tailroom, since
 735                          * dev_alloc_skb gives us a larger skb than we
 736                          * requested
 737                          * Note : use tx_data_size, because max_data_size
 738                          * may have changed and we don't want to overwrite
 739                          * the skb. - Jean II
 740                          */
 741                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 742                                 /* Adjust data to tailroom */
 743                                 if (size > tailroom)
 744                                         size = tailroom;
 745                         } else {
 746                                 /*
 747                                  * Current transmit frame is full, so break
 748                                  * out, so we can send it as soon as possible
 749                                  */
 750                                 break;
 751                         }
 752                 } else {
 753                         /* Prepare a full sized frame */
 754                         skb = alloc_skb(self->max_data_size+
 755                                         self->max_header_size,
 756                                         GFP_ATOMIC);
 757                         if (!skb) {
 758                                 spin_unlock_irqrestore(&self->spinlock, flags);
 759                                 return -ENOBUFS;
 760                         }
 761                         skb_reserve(skb, self->max_header_size);
 762                         self->tx_skb = skb;
 763                         /* Remember skb size because max_data_size may
 764                          * change later on - Jean II */
 765                         self->tx_data_size = self->max_data_size;
 766                 }
 767
 768                 /* Copy data */
 769                 memcpy(skb_put(skb,size), buf + len, size);
 770
 771                 count -= size;
 772                 len += size;
 773         }
 774
 775         spin_unlock_irqrestore(&self->spinlock, flags);
 776
 777         /*
 778          * Schedule a new thread which will transmit the frame as soon
 779          * as possible, but at a safe point in time. We do this so the
 780          * "user" can give us data multiple times, as PPP does (because of
 781          * its 256 byte tx buffer). We will then defragment and send out
 782          * all this data as one single packet.
 783          */
 784         schedule_work(&self->tqueue);
 785
 786         return len;
 787 }
 788
 789 /*
 790  * Function ircomm_tty_write_room (tty)
 791  *
 792  *    This routine returns the numbers of characters the tty driver will
 793  *    accept for queuing to be written. This number is subject to change as
 794  *    output buffers get emptied, or if the output flow control is acted.
 795  */
 796 static int ircomm_tty_write_room(struct tty_struct *tty)
 797 {
 798         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 799         unsigned long flags;
 800         int ret;
 801
 802         IRDA_ASSERT(self != NULL, return -1;);
 803         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 804
 805 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 806         /* max_header_size tells us if the channel is initialised or not. */
 807         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 808                 /* Don't bother us yet */
 809                 return 0;
 810 #endif
 811
 812         /* Check if we are allowed to transmit any data.
 813          * hw_stopped is the regular flow control.
 814          * Jean II */
 815         if (tty->hw_stopped)
 816                 ret = 0;
 817         else {
 818                 spin_lock_irqsave(&self->spinlock, flags);
 819                 if (self->tx_skb)
 820                         ret = self->tx_data_size - self->tx_skb->len;
 821                 else
 822                         ret = self->max_data_size;
 823                 spin_unlock_irqrestore(&self->spinlock, flags);
 824         }
 825         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 826
 827         return ret;
 828 }
 829
 830 /*
 831  * Function ircomm_tty_wait_until_sent (tty, timeout)
 832  *
 833  *    This routine waits until the device has written out all of the
 834  *    characters in its transmitter FIFO.
 835  */
 836 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 837 {
 838         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 839         unsigned long orig_jiffies, poll_time;
 840         unsigned long flags;
 841
 842         IRDA_DEBUG(2, "%s()\n", __func__ );
 843
 844         IRDA_ASSERT(self != NULL, return;);
 845         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 846
 847         orig_jiffies = jiffies;
 848
 849         /* Set poll time to 200 ms */
 850         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 851
 852         spin_lock_irqsave(&self->spinlock, flags);
 853         while (self->tx_skb && self->tx_skb->len) {
 854                 spin_unlock_irqrestore(&self->spinlock, flags);
 855                 schedule_timeout_interruptible(poll_time);
 856                 spin_lock_irqsave(&self->spinlock, flags);
 857                 if (signal_pending(current))
 858                         break;
 859                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 860                         break;
 861         }
 862         spin_unlock_irqrestore(&self->spinlock, flags);
 863         current->state = TASK_RUNNING;
 864 }
 865
 866 /*
 867  * Function ircomm_tty_throttle (tty)
 868  *
 869  *    This routine notifies the tty driver that input buffers for the line
 870  *    discipline are close to full, and it should somehow signal that no
 871  *    more characters should be sent to the tty.
 872  */
 873 static void ircomm_tty_throttle(struct tty_struct *tty)
 874 {
 875         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 876
 877         IRDA_DEBUG(2, "%s()\n", __func__ );
 878
 879         IRDA_ASSERT(self != NULL, return;);
 880         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 881
 882         /* Software flow control? */
 883         if (I_IXOFF(tty))
 884                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 885
 886         /* Hardware flow control? */
 887         if (tty->termios->c_cflag & CRTSCTS) {
 888                 self->settings.dte &= ~IRCOMM_RTS;
 889                 self->settings.dte |= IRCOMM_DELTA_RTS;
 890
 891                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 892         }
 893
 894         ircomm_flow_request(self->ircomm, FLOW_STOP);
 895 }
 896
 897 /*
 898  * Function ircomm_tty_unthrottle (tty)
 899  *
 900  *    This routine notifies the tty drivers that it should signals that
 901  *    characters can now be sent to the tty without fear of overrunning the
 902  *    input buffers of the line disciplines.
 903  */
 904 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 905 {
 906         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 907
 908         IRDA_DEBUG(2, "%s()\n", __func__ );
 909
 910         IRDA_ASSERT(self != NULL, return;);
 911         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 912
 913         /* Using software flow control? */
 914         if (I_IXOFF(tty)) {
 915                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 916         }
 917
 918         /* Using hardware flow control? */
 919         if (tty->termios->c_cflag & CRTSCTS) {
 920                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 921
 922                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 923                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 924         }
 925         ircomm_flow_request(self->ircomm, FLOW_START);
 926 }
 927
 928 /*
 929  * Function ircomm_tty_chars_in_buffer (tty)
 930  *
 931  *    Indicates if there are any data in the buffer
 932  *
 933  */
 934 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 935 {
 936         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 937         unsigned long flags;
 938         int len = 0;
 939
 940         IRDA_ASSERT(self != NULL, return -1;);
 941         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 942
 943         spin_lock_irqsave(&self->spinlock, flags);
 944
 945         if (self->tx_skb)
 946                 len = self->tx_skb->len;
 947
 948         spin_unlock_irqrestore(&self->spinlock, flags);
 949
 950         return len;
 951 }
 952
 953 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 954 {
 955         unsigned long flags;
 956
 957         IRDA_ASSERT(self != NULL, return;);
 958         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 959
 960         IRDA_DEBUG(0, "%s()\n", __func__ );
 961
 962         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 963                 return;
 964
 965         ircomm_tty_detach_cable(self);
 966
 967         spin_lock_irqsave(&self->spinlock, flags);
 968
 969         del_timer(&self->watchdog_timer);
 970
 971         /* Free parameter buffer */
 972         if (self->ctrl_skb) {
 973                 dev_kfree_skb(self->ctrl_skb);
 974                 self->ctrl_skb = NULL;
 975         }
 976
 977         /* Free transmit buffer */
 978         if (self->tx_skb) {
 979                 dev_kfree_skb(self->tx_skb);
 980                 self->tx_skb = NULL;
 981         }
 982
 983         if (self->ircomm) {
 984                 ircomm_close(self->ircomm);
 985                 self->ircomm = NULL;
 986         }
 987
 988         spin_unlock_irqrestore(&self->spinlock, flags);
 989 }
 990
 991 /*
 992  * Function ircomm_tty_hangup (tty)
 993  *
 994  *    This routine notifies the tty driver that it should hangup the tty
 995  *    device.
 996  *
 997  */
 998 static void ircomm_tty_hangup(struct tty_struct *tty)
 999 {
1000         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1001         unsigned long   flags;
1002
1003         IRDA_DEBUG(0, "%s()\n", __func__ );
1004
1005         IRDA_ASSERT(self != NULL, return;);
1006         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1007
1008         /* ircomm_tty_flush_buffer(tty); */
1009         ircomm_tty_shutdown(self);
1010
1011         /* I guess we need to lock here - Jean II */
1012         spin_lock_irqsave(&self->spinlock, flags);
1013         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1014         self->tty = NULL;
1015         self->open_count = 0;
1016         spin_unlock_irqrestore(&self->spinlock, flags);
1017
1018         wake_up_interruptible(&self->open_wait);
1019 }
1020
1021 /*
1022  * Function ircomm_tty_send_xchar (tty, ch)
1023  *
1024  *    This routine is used to send a high-priority XON/XOFF character to
1025  *    the device.
1026  */
1027 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1028 {
1029         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1030 }
1031
1032 /*
1033  * Function ircomm_tty_start (tty)
1034  *
1035  *    This routine notifies the tty driver that it resume sending
1036  *    characters to the tty device.
1037  */
1038 void ircomm_tty_start(struct tty_struct *tty)
1039 {
1040         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1041
1042         ircomm_flow_request(self->ircomm, FLOW_START);
1043 }
1044
1045 /*
1046  * Function ircomm_tty_stop (tty)
1047  *
1048  *     This routine notifies the tty driver that it should stop outputting
1049  *     characters to the tty device.
1050  */
1051 static void ircomm_tty_stop(struct tty_struct *tty)
1052 {
1053         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1054
1055         IRDA_ASSERT(self != NULL, return;);
1056         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1057
1058         ircomm_flow_request(self->ircomm, FLOW_STOP);
1059 }
1060
1061 /*
1062  * Function ircomm_check_modem_status (self)
1063  *
1064  *    Check for any changes in the DCE's line settings. This function should
1065  *    be called whenever the dce parameter settings changes, to update the
1066  *    flow control settings and other things
1067  */
1068 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1069 {
1070         struct tty_struct *tty;
1071         int status;
1072
1073         IRDA_DEBUG(0, "%s()\n", __func__ );
1074
1075         IRDA_ASSERT(self != NULL, return;);
1076         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1077
1078         tty = self->tty;
1079
1080         status = self->settings.dce;
1081
1082         if (status & IRCOMM_DCE_DELTA_ANY) {
1083                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1084         }
1085         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1086                 IRDA_DEBUG(2,
1087                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1088                            (status & IRCOMM_CD) ? "on" : "off");
1089
1090                 if (status & IRCOMM_CD) {
1091                         wake_up_interruptible(&self->open_wait);
1092                 } else {
1093                         IRDA_DEBUG(2,
1094                                    "%s(), Doing serial hangup..\n", __func__ );
1095                         if (tty)
1096                                 tty_hangup(tty);
1097
1098                         /* Hangup will remote the tty, so better break out */
1099                         return;
1100                 }
1101         }
1102         if (self->flags & ASYNC_CTS_FLOW) {
1103                 if (tty->hw_stopped) {
1104                         if (status & IRCOMM_CTS) {
1105                                 IRDA_DEBUG(2,
1106                                            "%s(), CTS tx start...\n", __func__ );
1107                                 tty->hw_stopped = 0;
1108
1109                                 /* Wake up processes blocked on open */
1110                                 wake_up_interruptible(&self->open_wait);
1111
1112                                 schedule_work(&self->tqueue);
1113                                 return;
1114                         }
1115                 } else {
1116                         if (!(status & IRCOMM_CTS)) {
1117                                 IRDA_DEBUG(2,
1118                                            "%s(), CTS tx stop...\n", __func__ );
1119                                 tty->hw_stopped = 1;
1120                         }
1121                 }
1122         }
1123 }
1124
1125 /*
1126  * Function ircomm_tty_data_indication (instance, sap, skb)
1127  *
1128  *    Handle incoming data, and deliver it to the line discipline
1129  *
1130  */
1131 static int ircomm_tty_data_indication(void *instance, void *sap,
1132                                       struct sk_buff *skb)
1133 {
1134         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1135         struct tty_ldisc *ld;
1136
1137         IRDA_DEBUG(2, "%s()\n", __func__ );
1138
1139         IRDA_ASSERT(self != NULL, return -1;);
1140         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1141         IRDA_ASSERT(skb != NULL, return -1;);
1142
1143         if (!self->tty) {
1144                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1145                 return 0;
1146         }
1147
1148         /*
1149          * If we receive data when hardware is stopped then something is wrong.
1150          * We try to poll the peers line settings to check if we are up todate.
1151          * Devices like WinCE can do this, and since they don't send any
1152          * params, we can just as well declare the hardware for running.
1153          */
1154         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1155                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1156                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1157
1158                 /* We can just as well declare the hardware for running */
1159                 ircomm_tty_send_initial_parameters(self);
1160                 ircomm_tty_link_established(self);
1161         }
1162
1163         /*
1164          * Just give it over to the line discipline. There is no need to
1165          * involve the flip buffers, since we are not running in an interrupt
1166          * handler
1167          */
1168
1169         ld = tty_ldisc_ref(self->tty);
1170         if (ld)
1171                 ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len);
1172         tty_ldisc_deref(ld);
1173
1174         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1175
1176         return 0;
1177 }
1178
1179 /*
1180  * Function ircomm_tty_control_indication (instance, sap, skb)
1181  *
1182  *    Parse all incoming parameters (easy!)
1183  *
1184  */
1185 static int ircomm_tty_control_indication(void *instance, void *sap,
1186                                          struct sk_buff *skb)
1187 {
1188         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1189         int clen;
1190
1191         IRDA_DEBUG(4, "%s()\n", __func__ );
1192
1193         IRDA_ASSERT(self != NULL, return -1;);
1194         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1195         IRDA_ASSERT(skb != NULL, return -1;);
1196
1197         clen = skb->data[0];
1198
1199         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1200                                &ircomm_param_info);
1201
1202         /* No need to kfree_skb - see ircomm_control_indication() */
1203
1204         return 0;
1205 }
1206
1207 /*
1208  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1209  *
1210  *    This function is called by IrTTP when it wants us to slow down the
1211  *    transmission of data. We just mark the hardware as stopped, and wait
1212  *    for IrTTP to notify us that things are OK again.
1213  */
1214 static void ircomm_tty_flow_indication(void *instance, void *sap,
1215                                        LOCAL_FLOW cmd)
1216 {
1217         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1218         struct tty_struct *tty;
1219
1220         IRDA_ASSERT(self != NULL, return;);
1221         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1222
1223         tty = self->tty;
1224
1225         switch (cmd) {
1226         case FLOW_START:
1227                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1228                 tty->hw_stopped = 0;
1229
1230                 /* ircomm_tty_do_softint will take care of the rest */
1231                 schedule_work(&self->tqueue);
1232                 break;
1233         default:  /* If we get here, something is very wrong, better stop */
1234         case FLOW_STOP:
1235                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1236                 tty->hw_stopped = 1;
1237                 break;
1238         }
1239         self->flow = cmd;
1240 }
1241
1242 #ifdef CONFIG_PROC_FS
1243 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1244 {
1245         char sep;
1246
1247         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1248
1249         seq_puts(m, "Service type: ");
1250         if (self->service_type & IRCOMM_9_WIRE)
1251                 seq_puts(m, "9_WIRE");
1252         else if (self->service_type & IRCOMM_3_WIRE)
1253                 seq_puts(m, "3_WIRE");
1254         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1255                 seq_puts(m, "3_WIRE_RAW");
1256         else
1257                 seq_puts(m, "No common service type!\n");
1258         seq_putc(m, '\n');
1259
1260         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1261
1262         seq_printf(m, "DTE status:");
1263         sep = ' ';
1264         if (self->settings.dte & IRCOMM_RTS) {
1265                 seq_printf(m, "%cRTS", sep);
1266                 sep = '|';
1267         }
1268         if (self->settings.dte & IRCOMM_DTR) {
1269                 seq_printf(m, "%cDTR", sep);
1270                 sep = '|';
1271         }
1272         seq_putc(m, '\n');
1273
1274         seq_puts(m, "DCE status:");
1275         sep = ' ';
1276         if (self->settings.dce & IRCOMM_CTS) {
1277                 seq_printf(m, "%cCTS", sep);
1278                 sep = '|';
1279         }
1280         if (self->settings.dce & IRCOMM_DSR) {
1281                 seq_printf(m, "%cDSR", sep);
1282                 sep = '|';
1283         }
1284         if (self->settings.dce & IRCOMM_CD) {
1285                 seq_printf(m, "%cCD", sep);
1286                 sep = '|';
1287         }
1288         if (self->settings.dce & IRCOMM_RI) {
1289                 seq_printf(m, "%cRI", sep);
1290                 sep = '|';
1291         }
1292         seq_putc(m, '\n');
1293
1294         seq_puts(m, "Configuration: ");
1295         if (!self->settings.null_modem)
1296                 seq_puts(m, "DTE <-> DCE\n");
1297         else
1298                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1299
1300         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1301
1302         seq_puts(m, "Flow control:");
1303         sep = ' ';
1304         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1305                 seq_printf(m, "%cXON_XOFF_IN", sep);
1306                 sep = '|';
1307         }
1308         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1309                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1310                 sep = '|';
1311         }
1312         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1313                 seq_printf(m, "%cRTS_CTS_IN", sep);
1314                 sep = '|';
1315         }
1316         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1317                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1318                 sep = '|';
1319         }
1320         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1321                 seq_printf(m, "%cDSR_DTR_IN", sep);
1322                 sep = '|';
1323         }
1324         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1325                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1326                 sep = '|';
1327         }
1328         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1329                 seq_printf(m, "%cENQ_ACK_IN", sep);
1330                 sep = '|';
1331         }
1332         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1333                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1334                 sep = '|';
1335         }
1336         seq_putc(m, '\n');
1337
1338         seq_puts(m, "Flags:");
1339         sep = ' ';
1340         if (self->flags & ASYNC_CTS_FLOW) {
1341                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1342                 sep = '|';
1343         }
1344         if (self->flags & ASYNC_CHECK_CD) {
1345                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1346                 sep = '|';
1347         }
1348         if (self->flags & ASYNC_INITIALIZED) {
1349                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1350                 sep = '|';
1351         }
1352         if (self->flags & ASYNC_LOW_LATENCY) {
1353                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1354                 sep = '|';
1355         }
1356         if (self->flags & ASYNC_CLOSING) {
1357                 seq_printf(m, "%cASYNC_CLOSING", sep);
1358                 sep = '|';
1359         }
1360         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1361                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1362                 sep = '|';
1363         }
1364         seq_putc(m, '\n');
1365
1366         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1367         seq_printf(m, "Open count: %d\n", self->open_count);
1368         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1369         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1370
1371         if (self->tty)
1372                 seq_printf(m, "Hardware: %s\n",
1373                                self->tty->hw_stopped ? "Stopped" : "Running");
1374 }
1375
1376 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1377 {
1378         struct ircomm_tty_cb *self;
1379         unsigned long flags;
1380
1381         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1382
1383         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1384         while (self != NULL) {
1385                 if (self->magic != IRCOMM_TTY_MAGIC)
1386                         break;
1387
1388                 ircomm_tty_line_info(self, m);
1389                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1390         }
1391         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1392         return 0;
1393 }
1394
1395 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1396 {
1397         return single_open(file, ircomm_tty_proc_show, NULL);
1398 }
1399
1400 static const struct file_operations ircomm_tty_proc_fops = {
1401         .owner          = THIS_MODULE,
1402         .open           = ircomm_tty_proc_open,
1403         .read           = seq_read,
1404         .llseek         = seq_lseek,
1405         .release        = single_release,
1406 };
1407 #endif /* CONFIG_PROC_FS */
1408
1409 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1410 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1411 MODULE_LICENSE("GPL");
1412 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1413
1414 module_init(ircomm_tty_init);
1415 module_exit(ircomm_tty_cleanup);