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->owner           = THIS_MODULE;
 126         driver->driver_name     = "ircomm";
 127         driver->name            = "ircomm";
 128         driver->major           = IRCOMM_TTY_MAJOR;
 129         driver->minor_start     = IRCOMM_TTY_MINOR;
 130         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 131         driver->subtype         = SERIAL_TYPE_NORMAL;
 132         driver->init_termios    = tty_std_termios;
 133         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 134         driver->flags           = TTY_DRIVER_REAL_RAW;
 135         tty_set_operations(driver, &ops);
 136         if (tty_register_driver(driver)) {
 137                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 138                            __func__);
 139                 put_tty_driver(driver);
 140                 return -1;
 141         }
 142         return 0;
 143 }
 144
 145 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 146 {
 147         IRDA_DEBUG(0, "%s()\n", __func__ );
 148
 149         IRDA_ASSERT(self != NULL, return;);
 150         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 151
 152         ircomm_tty_shutdown(self);
 153
 154         self->magic = 0;
 155         kfree(self);
 156 }
 157
 158 /*
 159  * Function ircomm_tty_cleanup ()
 160  *
 161  *    Remove IrCOMM TTY layer/driver
 162  *
 163  */
 164 static void __exit ircomm_tty_cleanup(void)
 165 {
 166         int ret;
 167
 168         IRDA_DEBUG(4, "%s()\n", __func__ );
 169
 170         ret = tty_unregister_driver(driver);
 171         if (ret) {
 172                 IRDA_ERROR("%s(), failed to unregister driver\n",
 173                            __func__);
 174                 return;
 175         }
 176
 177         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 178         put_tty_driver(driver);
 179 }
 180
 181 /*
 182  * Function ircomm_startup (self)
 183  *
 184  *
 185  *
 186  */
 187 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 188 {
 189         notify_t notify;
 190         int ret = -ENODEV;
 191
 192         IRDA_DEBUG(2, "%s()\n", __func__ );
 193
 194         IRDA_ASSERT(self != NULL, return -1;);
 195         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 196
 197         /* Check if already open */
 198         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 199                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 200                 return 0;
 201         }
 202
 203         /* Register with IrCOMM */
 204         irda_notify_init(&notify);
 205         /* These callbacks we must handle ourselves */
 206         notify.data_indication       = ircomm_tty_data_indication;
 207         notify.udata_indication      = ircomm_tty_control_indication;
 208         notify.flow_indication       = ircomm_tty_flow_indication;
 209
 210         /* Use the ircomm_tty interface for these ones */
 211         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 212         notify.connect_confirm       = ircomm_tty_connect_confirm;
 213         notify.connect_indication    = ircomm_tty_connect_indication;
 214         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 215         notify.instance = self;
 216
 217         if (!self->ircomm) {
 218                 self->ircomm = ircomm_open(&notify, self->service_type,
 219                                            self->line);
 220         }
 221         if (!self->ircomm)
 222                 goto err;
 223
 224         self->slsap_sel = self->ircomm->slsap_sel;
 225
 226         /* Connect IrCOMM link with remote device */
 227         ret = ircomm_tty_attach_cable(self);
 228         if (ret < 0) {
 229                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 230                 goto err;
 231         }
 232
 233         return 0;
 234 err:
 235         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
 236         return ret;
 237 }
 238
 239 /*
 240  * Function ircomm_block_til_ready (self, filp)
 241  *
 242  *
 243  *
 244  */
 245 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 246                                       struct file *filp)
 247 {
 248         DECLARE_WAITQUEUE(wait, current);
 249         int             retval;
 250         int             do_clocal = 0, extra_count = 0;
 251         unsigned long   flags;
 252         struct tty_struct *tty;
 253
 254         IRDA_DEBUG(2, "%s()\n", __func__ );
 255
 256         tty = self->tty;
 257
 258         /*
 259          * If non-blocking mode is set, or the port is not enabled,
 260          * then make the check up front and then exit.
 261          */
 262         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 263                 /* nonblock mode is set or port is not enabled */
 264                 self->flags |= ASYNC_NORMAL_ACTIVE;
 265                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 266                 return 0;
 267         }
 268
 269         if (tty->termios->c_cflag & CLOCAL) {
 270                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 271                 do_clocal = 1;
 272         }
 273
 274         /* Wait for carrier detect and the line to become
 275          * free (i.e., not in use by the callout).  While we are in
 276          * this loop, self->open_count is dropped by one, so that
 277          * mgsl_close() knows when to free things.  We restore it upon
 278          * exit, either normal or abnormal.
 279          */
 280
 281         retval = 0;
 282         add_wait_queue(&self->open_wait, &wait);
 283
 284         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 285               __FILE__,__LINE__, tty->driver->name, self->open_count );
 286
 287         /* As far as I can see, we protect open_count - Jean II */
 288         spin_lock_irqsave(&self->spinlock, flags);
 289         if (!tty_hung_up_p(filp)) {
 290                 extra_count = 1;
 291                 self->open_count--;
 292         }
 293         spin_unlock_irqrestore(&self->spinlock, flags);
 294         self->blocked_open++;
 295
 296         while (1) {
 297                 if (tty->termios->c_cflag & CBAUD) {
 298                         /* Here, we use to lock those two guys, but
 299                          * as ircomm_param_request() does it itself,
 300                          * I don't see the point (and I see the deadlock).
 301                          * Jean II */
 302                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 303
 304                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 305                 }
 306
 307                 current->state = TASK_INTERRUPTIBLE;
 308
 309                 if (tty_hung_up_p(filp) ||
 310                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 311                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 312                                         -EAGAIN : -ERESTARTSYS;
 313                         break;
 314                 }
 315
 316                 /*
 317                  * Check if link is ready now. Even if CLOCAL is
 318                  * specified, we cannot return before the IrCOMM link is
 319                  * ready
 320                  */
 321                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
 322                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 323                     self->state == IRCOMM_TTY_READY)
 324                 {
 325                         break;
 326                 }
 327
 328                 if (signal_pending(current)) {
 329                         retval = -ERESTARTSYS;
 330                         break;
 331                 }
 332
 333                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 334                       __FILE__,__LINE__, tty->driver->name, self->open_count );
 335
 336                 schedule();
 337         }
 338
 339         __set_current_state(TASK_RUNNING);
 340         remove_wait_queue(&self->open_wait, &wait);
 341
 342         if (extra_count) {
 343                 /* ++ is not atomic, so this should be protected - Jean II */
 344                 spin_lock_irqsave(&self->spinlock, flags);
 345                 self->open_count++;
 346                 spin_unlock_irqrestore(&self->spinlock, flags);
 347         }
 348         self->blocked_open--;
 349
 350         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 351               __FILE__,__LINE__, tty->driver->name, self->open_count);
 352
 353         if (!retval)
 354                 self->flags |= ASYNC_NORMAL_ACTIVE;
 355
 356         return retval;
 357 }
 358
 359 /*
 360  * Function ircomm_tty_open (tty, filp)
 361  *
 362  *    This routine is called when a particular tty device is opened. This
 363  *    routine is mandatory; if this routine is not filled in, the attempted
 364  *    open will fail with ENODEV.
 365  */
 366 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 367 {
 368         struct ircomm_tty_cb *self;
 369         unsigned int line;
 370         unsigned long   flags;
 371         int ret;
 372
 373         IRDA_DEBUG(2, "%s()\n", __func__ );
 374
 375         line = tty->index;
 376         if (line >= IRCOMM_TTY_PORTS)
 377                 return -ENODEV;
 378
 379         /* Check if instance already exists */
 380         self = hashbin_lock_find(ircomm_tty, line, NULL);
 381         if (!self) {
 382                 /* No, so make new instance */
 383                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 384                 if (self == NULL) {
 385                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 386                         return -ENOMEM;
 387                 }
 388
 389                 self->magic = IRCOMM_TTY_MAGIC;
 390                 self->flow = FLOW_STOP;
 391
 392                 self->line = line;
 393                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 394                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 395                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 396                 self->close_delay = 5*HZ/10;
 397                 self->closing_wait = 30*HZ;
 398
 399                 /* Init some important stuff */
 400                 init_timer(&self->watchdog_timer);
 401                 init_waitqueue_head(&self->open_wait);
 402                 init_waitqueue_head(&self->close_wait);
 403                 spin_lock_init(&self->spinlock);
 404
 405                 /*
 406                  * Force TTY into raw mode by default which is usually what
 407                  * we want for IrCOMM and IrLPT. This way applications will
 408                  * not have to twiddle with printcap etc.
 409                  *
 410                  * Note this is completely usafe and doesn't work properly
 411                  */
 412                 tty->termios->c_iflag = 0;
 413                 tty->termios->c_oflag = 0;
 414
 415                 /* Insert into hash */
 416                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 417         }
 418         /* ++ is not atomic, so this should be protected - Jean II */
 419         spin_lock_irqsave(&self->spinlock, flags);
 420         self->open_count++;
 421
 422         tty->driver_data = self;
 423         self->tty = tty;
 424         spin_unlock_irqrestore(&self->spinlock, flags);
 425
 426         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 427                    self->line, self->open_count);
 428
 429         /* Not really used by us, but lets do it anyway */
 430         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 431
 432         /*
 433          * If the port is the middle of closing, bail out now
 434          */
 435         if (tty_hung_up_p(filp) ||
 436             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 437
 438                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 439                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 440                  * IMHO it's either not needed in the first place
 441                  * or for some reason we need to make sure the async
 442                  * closing has been finished - if so, wouldn't we
 443                  * probably better sleep uninterruptible?
 444                  */
 445
 446                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 447                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 448                                      __func__);
 449                         return -ERESTARTSYS;
 450                 }
 451
 452 #ifdef SERIAL_DO_RESTART
 453                 return (self->flags & ASYNC_HUP_NOTIFY) ?
 454                         -EAGAIN : -ERESTARTSYS;
 455 #else
 456                 return -EAGAIN;
 457 #endif
 458         }
 459
 460         /* Check if this is a "normal" ircomm device, or an irlpt device */
 461         if (line < 0x10) {
 462                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 463                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 464                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 465                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 466                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 467         } else {
 468                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 469                 self->service_type = IRCOMM_3_WIRE_RAW;
 470                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 471         }
 472
 473         ret = ircomm_tty_startup(self);
 474         if (ret)
 475                 return ret;
 476
 477         ret = ircomm_tty_block_til_ready(self, filp);
 478         if (ret) {
 479                 IRDA_DEBUG(2,
 480                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 481                       ret);
 482
 483                 return ret;
 484         }
 485         return 0;
 486 }
 487
 488 /*
 489  * Function ircomm_tty_close (tty, filp)
 490  *
 491  *    This routine is called when a particular tty device is closed.
 492  *
 493  */
 494 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 495 {
 496         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 497         unsigned long flags;
 498
 499         IRDA_DEBUG(0, "%s()\n", __func__ );
 500
 501         IRDA_ASSERT(self != NULL, return;);
 502         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 503
 504         spin_lock_irqsave(&self->spinlock, flags);
 505
 506         if (tty_hung_up_p(filp)) {
 507                 spin_unlock_irqrestore(&self->spinlock, flags);
 508
 509                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 510                 return;
 511         }
 512
 513         if ((tty->count == 1) && (self->open_count != 1)) {
 514                 /*
 515                  * Uh, oh.  tty->count is 1, which means that the tty
 516                  * structure will be freed.  state->count should always
 517                  * be one in these conditions.  If it's greater than
 518                  * one, we've got real problems, since it means the
 519                  * serial port won't be shutdown.
 520                  */
 521                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 522                            "tty->count is 1, state->count is %d\n", __func__ ,
 523                            self->open_count);
 524                 self->open_count = 1;
 525         }
 526
 527         if (--self->open_count < 0) {
 528                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 529                            __func__, self->line, self->open_count);
 530                 self->open_count = 0;
 531         }
 532         if (self->open_count) {
 533                 spin_unlock_irqrestore(&self->spinlock, flags);
 534
 535                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 536                 return;
 537         }
 538
 539         /* Hum... Should be test_and_set_bit ??? - Jean II */
 540         set_bit(ASYNC_B_CLOSING, &self->flags);
 541
 542         /* We need to unlock here (we were unlocking at the end of this
 543          * function), because tty_wait_until_sent() may schedule.
 544          * I don't know if the rest should be protected somehow,
 545          * so someone should check. - Jean II */
 546         spin_unlock_irqrestore(&self->spinlock, flags);
 547
 548         /*
 549          * Now we wait for the transmit buffer to clear; and we notify
 550          * the line discipline to only process XON/XOFF characters.
 551          */
 552         tty->closing = 1;
 553         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 554                 tty_wait_until_sent_from_close(tty, self->closing_wait);
 555
 556         ircomm_tty_shutdown(self);
 557
 558         tty_driver_flush_buffer(tty);
 559         tty_ldisc_flush(tty);
 560
 561         tty->closing = 0;
 562         self->tty = NULL;
 563
 564         if (self->blocked_open) {
 565                 if (self->close_delay)
 566                         schedule_timeout_interruptible(self->close_delay);
 567                 wake_up_interruptible(&self->open_wait);
 568         }
 569
 570         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 571         wake_up_interruptible(&self->close_wait);
 572 }
 573
 574 /*
 575  * Function ircomm_tty_flush_buffer (tty)
 576  *
 577  *
 578  *
 579  */
 580 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 581 {
 582         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 583
 584         IRDA_ASSERT(self != NULL, return;);
 585         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 586
 587         /*
 588          * Let do_softint() do this to avoid race condition with
 589          * do_softint() ;-)
 590          */
 591         schedule_work(&self->tqueue);
 592 }
 593
 594 /*
 595  * Function ircomm_tty_do_softint (work)
 596  *
 597  *    We use this routine to give the write wakeup to the user at at a
 598  *    safe time (as fast as possible after write have completed). This
 599  *    can be compared to the Tx interrupt.
 600  */
 601 static void ircomm_tty_do_softint(struct work_struct *work)
 602 {
 603         struct ircomm_tty_cb *self =
 604                 container_of(work, struct ircomm_tty_cb, tqueue);
 605         struct tty_struct *tty;
 606         unsigned long flags;
 607         struct sk_buff *skb, *ctrl_skb;
 608
 609         IRDA_DEBUG(2, "%s()\n", __func__ );
 610
 611         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 612                 return;
 613
 614         tty = self->tty;
 615         if (!tty)
 616                 return;
 617
 618         /* Unlink control buffer */
 619         spin_lock_irqsave(&self->spinlock, flags);
 620
 621         ctrl_skb = self->ctrl_skb;
 622         self->ctrl_skb = NULL;
 623
 624         spin_unlock_irqrestore(&self->spinlock, flags);
 625
 626         /* Flush control buffer if any */
 627         if(ctrl_skb) {
 628                 if(self->flow == FLOW_START)
 629                         ircomm_control_request(self->ircomm, ctrl_skb);
 630                 /* Drop reference count - see ircomm_ttp_data_request(). */
 631                 dev_kfree_skb(ctrl_skb);
 632         }
 633
 634         if (tty->hw_stopped)
 635                 return;
 636
 637         /* Unlink transmit buffer */
 638         spin_lock_irqsave(&self->spinlock, flags);
 639
 640         skb = self->tx_skb;
 641         self->tx_skb = NULL;
 642
 643         spin_unlock_irqrestore(&self->spinlock, flags);
 644
 645         /* Flush transmit buffer if any */
 646         if (skb) {
 647                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 648                 /* Drop reference count - see ircomm_ttp_data_request(). */
 649                 dev_kfree_skb(skb);
 650         }
 651
 652         /* Check if user (still) wants to be waken up */
 653         tty_wakeup(tty);
 654 }
 655
 656 /*
 657  * Function ircomm_tty_write (tty, buf, count)
 658  *
 659  *    This routine is called by the kernel to write a series of characters
 660  *    to the tty device. The characters may come from user space or kernel
 661  *    space. This routine will return the number of characters actually
 662  *    accepted for writing. This routine is mandatory.
 663  */
 664 static int ircomm_tty_write(struct tty_struct *tty,
 665                             const unsigned char *buf, int count)
 666 {
 667         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 668         unsigned long flags;
 669         struct sk_buff *skb;
 670         int tailroom = 0;
 671         int len = 0;
 672         int size;
 673
 674         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 675                    tty->hw_stopped);
 676
 677         IRDA_ASSERT(self != NULL, return -1;);
 678         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 679
 680         /* We may receive packets from the TTY even before we have finished
 681          * our setup. Not cool.
 682          * The problem is that we don't know the final header and data size
 683          * to create the proper skb, so any skb we would create would have
 684          * bogus header and data size, so need care.
 685          * We use a bogus header size to safely detect this condition.
 686          * Another problem is that hw_stopped was set to 0 way before it
 687          * should be, so we would drop this skb. It should now be fixed.
 688          * One option is to not accept data until we are properly setup.
 689          * But, I suspect that when it happens, the ppp line discipline
 690          * just "drops" the data, which might screw up connect scripts.
 691          * The second option is to create a "safe skb", with large header
 692          * and small size (see ircomm_tty_open() for values).
 693          * We just need to make sure that when the real values get filled,
 694          * we don't mess up the original "safe skb" (see tx_data_size).
 695          * Jean II */
 696         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 697                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 698 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 699                 /* We didn't consume anything, TTY will retry */
 700                 return 0;
 701 #endif
 702         }
 703
 704         if (count < 1)
 705                 return 0;
 706
 707         /* Protect our manipulation of self->tx_skb and related */
 708         spin_lock_irqsave(&self->spinlock, flags);
 709
 710         /* Fetch current transmit buffer */
 711         skb = self->tx_skb;
 712
 713         /*
 714          * Send out all the data we get, possibly as multiple fragmented
 715          * frames, but this will only happen if the data is larger than the
 716          * max data size. The normal case however is just the opposite, and
 717          * this function may be called multiple times, and will then actually
 718          * defragment the data and send it out as one packet as soon as
 719          * possible, but at a safer point in time
 720          */
 721         while (count) {
 722                 size = count;
 723
 724                 /* Adjust data size to the max data size */
 725                 if (size > self->max_data_size)
 726                         size = self->max_data_size;
 727
 728                 /*
 729                  * Do we already have a buffer ready for transmit, or do
 730                  * we need to allocate a new frame
 731                  */
 732                 if (skb) {
 733                         /*
 734                          * Any room for more data at the end of the current
 735                          * transmit buffer? Cannot use skb_tailroom, since
 736                          * dev_alloc_skb gives us a larger skb than we
 737                          * requested
 738                          * Note : use tx_data_size, because max_data_size
 739                          * may have changed and we don't want to overwrite
 740                          * the skb. - Jean II
 741                          */
 742                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 743                                 /* Adjust data to tailroom */
 744                                 if (size > tailroom)
 745                                         size = tailroom;
 746                         } else {
 747                                 /*
 748                                  * Current transmit frame is full, so break
 749                                  * out, so we can send it as soon as possible
 750                                  */
 751                                 break;
 752                         }
 753                 } else {
 754                         /* Prepare a full sized frame */
 755                         skb = alloc_skb(self->max_data_size+
 756                                         self->max_header_size,
 757                                         GFP_ATOMIC);
 758                         if (!skb) {
 759                                 spin_unlock_irqrestore(&self->spinlock, flags);
 760                                 return -ENOBUFS;
 761                         }
 762                         skb_reserve(skb, self->max_header_size);
 763                         self->tx_skb = skb;
 764                         /* Remember skb size because max_data_size may
 765                          * change later on - Jean II */
 766                         self->tx_data_size = self->max_data_size;
 767                 }
 768
 769                 /* Copy data */
 770                 memcpy(skb_put(skb,size), buf + len, size);
 771
 772                 count -= size;
 773                 len += size;
 774         }
 775
 776         spin_unlock_irqrestore(&self->spinlock, flags);
 777
 778         /*
 779          * Schedule a new thread which will transmit the frame as soon
 780          * as possible, but at a safe point in time. We do this so the
 781          * "user" can give us data multiple times, as PPP does (because of
 782          * its 256 byte tx buffer). We will then defragment and send out
 783          * all this data as one single packet.
 784          */
 785         schedule_work(&self->tqueue);
 786
 787         return len;
 788 }
 789
 790 /*
 791  * Function ircomm_tty_write_room (tty)
 792  *
 793  *    This routine returns the numbers of characters the tty driver will
 794  *    accept for queuing to be written. This number is subject to change as
 795  *    output buffers get emptied, or if the output flow control is acted.
 796  */
 797 static int ircomm_tty_write_room(struct tty_struct *tty)
 798 {
 799         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 800         unsigned long flags;
 801         int ret;
 802
 803         IRDA_ASSERT(self != NULL, return -1;);
 804         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 805
 806 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 807         /* max_header_size tells us if the channel is initialised or not. */
 808         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 809                 /* Don't bother us yet */
 810                 return 0;
 811 #endif
 812
 813         /* Check if we are allowed to transmit any data.
 814          * hw_stopped is the regular flow control.
 815          * Jean II */
 816         if (tty->hw_stopped)
 817                 ret = 0;
 818         else {
 819                 spin_lock_irqsave(&self->spinlock, flags);
 820                 if (self->tx_skb)
 821                         ret = self->tx_data_size - self->tx_skb->len;
 822                 else
 823                         ret = self->max_data_size;
 824                 spin_unlock_irqrestore(&self->spinlock, flags);
 825         }
 826         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 827
 828         return ret;
 829 }
 830
 831 /*
 832  * Function ircomm_tty_wait_until_sent (tty, timeout)
 833  *
 834  *    This routine waits until the device has written out all of the
 835  *    characters in its transmitter FIFO.
 836  */
 837 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 838 {
 839         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 840         unsigned long orig_jiffies, poll_time;
 841         unsigned long flags;
 842
 843         IRDA_DEBUG(2, "%s()\n", __func__ );
 844
 845         IRDA_ASSERT(self != NULL, return;);
 846         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 847
 848         orig_jiffies = jiffies;
 849
 850         /* Set poll time to 200 ms */
 851         poll_time = msecs_to_jiffies(200);
 852         if (timeout)
 853                 poll_time = min_t(unsigned long, timeout, poll_time);
 854
 855         spin_lock_irqsave(&self->spinlock, flags);
 856         while (self->tx_skb && self->tx_skb->len) {
 857                 spin_unlock_irqrestore(&self->spinlock, flags);
 858                 schedule_timeout_interruptible(poll_time);
 859                 spin_lock_irqsave(&self->spinlock, flags);
 860                 if (signal_pending(current))
 861                         break;
 862                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 863                         break;
 864         }
 865         spin_unlock_irqrestore(&self->spinlock, flags);
 866         current->state = TASK_RUNNING;
 867 }
 868
 869 /*
 870  * Function ircomm_tty_throttle (tty)
 871  *
 872  *    This routine notifies the tty driver that input buffers for the line
 873  *    discipline are close to full, and it should somehow signal that no
 874  *    more characters should be sent to the tty.
 875  */
 876 static void ircomm_tty_throttle(struct tty_struct *tty)
 877 {
 878         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 879
 880         IRDA_DEBUG(2, "%s()\n", __func__ );
 881
 882         IRDA_ASSERT(self != NULL, return;);
 883         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 884
 885         /* Software flow control? */
 886         if (I_IXOFF(tty))
 887                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 888
 889         /* Hardware flow control? */
 890         if (tty->termios->c_cflag & CRTSCTS) {
 891                 self->settings.dte &= ~IRCOMM_RTS;
 892                 self->settings.dte |= IRCOMM_DELTA_RTS;
 893
 894                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 895         }
 896
 897         ircomm_flow_request(self->ircomm, FLOW_STOP);
 898 }
 899
 900 /*
 901  * Function ircomm_tty_unthrottle (tty)
 902  *
 903  *    This routine notifies the tty drivers that it should signals that
 904  *    characters can now be sent to the tty without fear of overrunning the
 905  *    input buffers of the line disciplines.
 906  */
 907 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 908 {
 909         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 910
 911         IRDA_DEBUG(2, "%s()\n", __func__ );
 912
 913         IRDA_ASSERT(self != NULL, return;);
 914         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 915
 916         /* Using software flow control? */
 917         if (I_IXOFF(tty)) {
 918                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 919         }
 920
 921         /* Using hardware flow control? */
 922         if (tty->termios->c_cflag & CRTSCTS) {
 923                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 924
 925                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 926                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 927         }
 928         ircomm_flow_request(self->ircomm, FLOW_START);
 929 }
 930
 931 /*
 932  * Function ircomm_tty_chars_in_buffer (tty)
 933  *
 934  *    Indicates if there are any data in the buffer
 935  *
 936  */
 937 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 938 {
 939         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 940         unsigned long flags;
 941         int len = 0;
 942
 943         IRDA_ASSERT(self != NULL, return -1;);
 944         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 945
 946         spin_lock_irqsave(&self->spinlock, flags);
 947
 948         if (self->tx_skb)
 949                 len = self->tx_skb->len;
 950
 951         spin_unlock_irqrestore(&self->spinlock, flags);
 952
 953         return len;
 954 }
 955
 956 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 957 {
 958         unsigned long flags;
 959
 960         IRDA_ASSERT(self != NULL, return;);
 961         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 962
 963         IRDA_DEBUG(0, "%s()\n", __func__ );
 964
 965         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 966                 return;
 967
 968         ircomm_tty_detach_cable(self);
 969
 970         spin_lock_irqsave(&self->spinlock, flags);
 971
 972         del_timer(&self->watchdog_timer);
 973
 974         /* Free parameter buffer */
 975         if (self->ctrl_skb) {
 976                 dev_kfree_skb(self->ctrl_skb);
 977                 self->ctrl_skb = NULL;
 978         }
 979
 980         /* Free transmit buffer */
 981         if (self->tx_skb) {
 982                 dev_kfree_skb(self->tx_skb);
 983                 self->tx_skb = NULL;
 984         }
 985
 986         if (self->ircomm) {
 987                 ircomm_close(self->ircomm);
 988                 self->ircomm = NULL;
 989         }
 990
 991         spin_unlock_irqrestore(&self->spinlock, flags);
 992 }
 993
 994 /*
 995  * Function ircomm_tty_hangup (tty)
 996  *
 997  *    This routine notifies the tty driver that it should hangup the tty
 998  *    device.
 999  *
1000  */
1001 static void ircomm_tty_hangup(struct tty_struct *tty)
1002 {
1003         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1004         unsigned long   flags;
1005
1006         IRDA_DEBUG(0, "%s()\n", __func__ );
1007
1008         IRDA_ASSERT(self != NULL, return;);
1009         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1010
1011         /* ircomm_tty_flush_buffer(tty); */
1012         ircomm_tty_shutdown(self);
1013
1014         /* I guess we need to lock here - Jean II */
1015         spin_lock_irqsave(&self->spinlock, flags);
1016         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1017         self->tty = NULL;
1018         self->open_count = 0;
1019         spin_unlock_irqrestore(&self->spinlock, flags);
1020
1021         wake_up_interruptible(&self->open_wait);
1022 }
1023
1024 /*
1025  * Function ircomm_tty_send_xchar (tty, ch)
1026  *
1027  *    This routine is used to send a high-priority XON/XOFF character to
1028  *    the device.
1029  */
1030 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1031 {
1032         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1033 }
1034
1035 /*
1036  * Function ircomm_tty_start (tty)
1037  *
1038  *    This routine notifies the tty driver that it resume sending
1039  *    characters to the tty device.
1040  */
1041 void ircomm_tty_start(struct tty_struct *tty)
1042 {
1043         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1044
1045         ircomm_flow_request(self->ircomm, FLOW_START);
1046 }
1047
1048 /*
1049  * Function ircomm_tty_stop (tty)
1050  *
1051  *     This routine notifies the tty driver that it should stop outputting
1052  *     characters to the tty device.
1053  */
1054 static void ircomm_tty_stop(struct tty_struct *tty)
1055 {
1056         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1057
1058         IRDA_ASSERT(self != NULL, return;);
1059         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1060
1061         ircomm_flow_request(self->ircomm, FLOW_STOP);
1062 }
1063
1064 /*
1065  * Function ircomm_check_modem_status (self)
1066  *
1067  *    Check for any changes in the DCE's line settings. This function should
1068  *    be called whenever the dce parameter settings changes, to update the
1069  *    flow control settings and other things
1070  */
1071 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1072 {
1073         struct tty_struct *tty;
1074         int status;
1075
1076         IRDA_DEBUG(0, "%s()\n", __func__ );
1077
1078         IRDA_ASSERT(self != NULL, return;);
1079         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1080
1081         tty = self->tty;
1082
1083         status = self->settings.dce;
1084
1085         if (status & IRCOMM_DCE_DELTA_ANY) {
1086                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1087         }
1088         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1089                 IRDA_DEBUG(2,
1090                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1091                            (status & IRCOMM_CD) ? "on" : "off");
1092
1093                 if (status & IRCOMM_CD) {
1094                         wake_up_interruptible(&self->open_wait);
1095                 } else {
1096                         IRDA_DEBUG(2,
1097                                    "%s(), Doing serial hangup..\n", __func__ );
1098                         if (tty)
1099                                 tty_hangup(tty);
1100
1101                         /* Hangup will remote the tty, so better break out */
1102                         return;
1103                 }
1104         }
1105         if (self->flags & ASYNC_CTS_FLOW) {
1106                 if (tty->hw_stopped) {
1107                         if (status & IRCOMM_CTS) {
1108                                 IRDA_DEBUG(2,
1109                                            "%s(), CTS tx start...\n", __func__ );
1110                                 tty->hw_stopped = 0;
1111
1112                                 /* Wake up processes blocked on open */
1113                                 wake_up_interruptible(&self->open_wait);
1114
1115                                 schedule_work(&self->tqueue);
1116                                 return;
1117                         }
1118                 } else {
1119                         if (!(status & IRCOMM_CTS)) {
1120                                 IRDA_DEBUG(2,
1121                                            "%s(), CTS tx stop...\n", __func__ );
1122                                 tty->hw_stopped = 1;
1123                         }
1124                 }
1125         }
1126 }
1127
1128 /*
1129  * Function ircomm_tty_data_indication (instance, sap, skb)
1130  *
1131  *    Handle incoming data, and deliver it to the line discipline
1132  *
1133  */
1134 static int ircomm_tty_data_indication(void *instance, void *sap,
1135                                       struct sk_buff *skb)
1136 {
1137         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1138
1139         IRDA_DEBUG(2, "%s()\n", __func__ );
1140
1141         IRDA_ASSERT(self != NULL, return -1;);
1142         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1143         IRDA_ASSERT(skb != NULL, return -1;);
1144
1145         if (!self->tty) {
1146                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1147                 return 0;
1148         }
1149
1150         /*
1151          * If we receive data when hardware is stopped then something is wrong.
1152          * We try to poll the peers line settings to check if we are up todate.
1153          * Devices like WinCE can do this, and since they don't send any
1154          * params, we can just as well declare the hardware for running.
1155          */
1156         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1157                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1158                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1159
1160                 /* We can just as well declare the hardware for running */
1161                 ircomm_tty_send_initial_parameters(self);
1162                 ircomm_tty_link_established(self);
1163         }
1164
1165         /*
1166          * Use flip buffer functions since the code may be called from interrupt
1167          * context
1168          */
1169         tty_insert_flip_string(self->tty, skb->data, skb->len);
1170         tty_flip_buffer_push(self->tty);
1171
1172         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1173
1174         return 0;
1175 }
1176
1177 /*
1178  * Function ircomm_tty_control_indication (instance, sap, skb)
1179  *
1180  *    Parse all incoming parameters (easy!)
1181  *
1182  */
1183 static int ircomm_tty_control_indication(void *instance, void *sap,
1184                                          struct sk_buff *skb)
1185 {
1186         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1187         int clen;
1188
1189         IRDA_DEBUG(4, "%s()\n", __func__ );
1190
1191         IRDA_ASSERT(self != NULL, return -1;);
1192         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1193         IRDA_ASSERT(skb != NULL, return -1;);
1194
1195         clen = skb->data[0];
1196
1197         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1198                                &ircomm_param_info);
1199
1200         /* No need to kfree_skb - see ircomm_control_indication() */
1201
1202         return 0;
1203 }
1204
1205 /*
1206  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1207  *
1208  *    This function is called by IrTTP when it wants us to slow down the
1209  *    transmission of data. We just mark the hardware as stopped, and wait
1210  *    for IrTTP to notify us that things are OK again.
1211  */
1212 static void ircomm_tty_flow_indication(void *instance, void *sap,
1213                                        LOCAL_FLOW cmd)
1214 {
1215         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1216         struct tty_struct *tty;
1217
1218         IRDA_ASSERT(self != NULL, return;);
1219         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1220
1221         tty = self->tty;
1222
1223         switch (cmd) {
1224         case FLOW_START:
1225                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1226                 tty->hw_stopped = 0;
1227
1228                 /* ircomm_tty_do_softint will take care of the rest */
1229                 schedule_work(&self->tqueue);
1230                 break;
1231         default:  /* If we get here, something is very wrong, better stop */
1232         case FLOW_STOP:
1233                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1234                 tty->hw_stopped = 1;
1235                 break;
1236         }
1237         self->flow = cmd;
1238 }
1239
1240 #ifdef CONFIG_PROC_FS
1241 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1242 {
1243         char sep;
1244
1245         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1246
1247         seq_puts(m, "Service type: ");
1248         if (self->service_type & IRCOMM_9_WIRE)
1249                 seq_puts(m, "9_WIRE");
1250         else if (self->service_type & IRCOMM_3_WIRE)
1251                 seq_puts(m, "3_WIRE");
1252         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1253                 seq_puts(m, "3_WIRE_RAW");
1254         else
1255                 seq_puts(m, "No common service type!\n");
1256         seq_putc(m, '\n');
1257
1258         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1259
1260         seq_printf(m, "DTE status:");
1261         sep = ' ';
1262         if (self->settings.dte & IRCOMM_RTS) {
1263                 seq_printf(m, "%cRTS", sep);
1264                 sep = '|';
1265         }
1266         if (self->settings.dte & IRCOMM_DTR) {
1267                 seq_printf(m, "%cDTR", sep);
1268                 sep = '|';
1269         }
1270         seq_putc(m, '\n');
1271
1272         seq_puts(m, "DCE status:");
1273         sep = ' ';
1274         if (self->settings.dce & IRCOMM_CTS) {
1275                 seq_printf(m, "%cCTS", sep);
1276                 sep = '|';
1277         }
1278         if (self->settings.dce & IRCOMM_DSR) {
1279                 seq_printf(m, "%cDSR", sep);
1280                 sep = '|';
1281         }
1282         if (self->settings.dce & IRCOMM_CD) {
1283                 seq_printf(m, "%cCD", sep);
1284                 sep = '|';
1285         }
1286         if (self->settings.dce & IRCOMM_RI) {
1287                 seq_printf(m, "%cRI", sep);
1288                 sep = '|';
1289         }
1290         seq_putc(m, '\n');
1291
1292         seq_puts(m, "Configuration: ");
1293         if (!self->settings.null_modem)
1294                 seq_puts(m, "DTE <-> DCE\n");
1295         else
1296                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1297
1298         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1299
1300         seq_puts(m, "Flow control:");
1301         sep = ' ';
1302         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1303                 seq_printf(m, "%cXON_XOFF_IN", sep);
1304                 sep = '|';
1305         }
1306         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1307                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1308                 sep = '|';
1309         }
1310         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1311                 seq_printf(m, "%cRTS_CTS_IN", sep);
1312                 sep = '|';
1313         }
1314         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1315                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1316                 sep = '|';
1317         }
1318         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1319                 seq_printf(m, "%cDSR_DTR_IN", sep);
1320                 sep = '|';
1321         }
1322         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1323                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1324                 sep = '|';
1325         }
1326         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1327                 seq_printf(m, "%cENQ_ACK_IN", sep);
1328                 sep = '|';
1329         }
1330         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1331                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1332                 sep = '|';
1333         }
1334         seq_putc(m, '\n');
1335
1336         seq_puts(m, "Flags:");
1337         sep = ' ';
1338         if (self->flags & ASYNC_CTS_FLOW) {
1339                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1340                 sep = '|';
1341         }
1342         if (self->flags & ASYNC_CHECK_CD) {
1343                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1344                 sep = '|';
1345         }
1346         if (self->flags & ASYNC_INITIALIZED) {
1347                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1348                 sep = '|';
1349         }
1350         if (self->flags & ASYNC_LOW_LATENCY) {
1351                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1352                 sep = '|';
1353         }
1354         if (self->flags & ASYNC_CLOSING) {
1355                 seq_printf(m, "%cASYNC_CLOSING", sep);
1356                 sep = '|';
1357         }
1358         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1359                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1360                 sep = '|';
1361         }
1362         seq_putc(m, '\n');
1363
1364         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1365         seq_printf(m, "Open count: %d\n", self->open_count);
1366         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1367         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1368
1369         if (self->tty)
1370                 seq_printf(m, "Hardware: %s\n",
1371                                self->tty->hw_stopped ? "Stopped" : "Running");
1372 }
1373
1374 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1375 {
1376         struct ircomm_tty_cb *self;
1377         unsigned long flags;
1378
1379         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1380
1381         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1382         while (self != NULL) {
1383                 if (self->magic != IRCOMM_TTY_MAGIC)
1384                         break;
1385
1386                 ircomm_tty_line_info(self, m);
1387                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1388         }
1389         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1390         return 0;
1391 }
1392
1393 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1394 {
1395         return single_open(file, ircomm_tty_proc_show, NULL);
1396 }
1397
1398 static const struct file_operations ircomm_tty_proc_fops = {
1399         .owner          = THIS_MODULE,
1400         .open           = ircomm_tty_proc_open,
1401         .read           = seq_read,
1402         .llseek         = seq_lseek,
1403         .release        = single_release,
1404 };
1405 #endif /* CONFIG_PROC_FS */
1406
1407 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1408 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1409 MODULE_LICENSE("GPL");
1410 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1411
1412 module_init(ircomm_tty_init);
1413 module_exit(ircomm_tty_cleanup);