SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/irda/ircomm/ircomm_tty.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty.c
   4  * Version:       1.0
   5  * Description:   IrCOMM serial TTY driver
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 21:00:56 1999
   9  * Modified at:   Wed Feb 23 00:09:02 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
  12  *
  13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/sched.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/termios.h>
  39 #include <linux/tty.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <net/irda/irda.h>
  46 #include <net/irda/irmod.h>
  47
  48 #include <net/irda/ircomm_core.h>
  49 #include <net/irda/ircomm_param.h>
  50 #include <net/irda/ircomm_tty_attach.h>
  51 #include <net/irda/ircomm_tty.h>
  52
  53 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  54 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  55 static int  ircomm_tty_write(struct tty_struct * tty,
  56                              const unsigned char *buf, int count);
  57 static int  ircomm_tty_write_room(struct tty_struct *tty);
  58 static void ircomm_tty_throttle(struct tty_struct *tty);
  59 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  60 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  61 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  62 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  63 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  64 static void ircomm_tty_hangup(struct tty_struct *tty);
  65 static void ircomm_tty_do_softint(struct work_struct *work);
  66 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  67 static void ircomm_tty_stop(struct tty_struct *tty);
  68
  69 static int ircomm_tty_data_indication(void *instance, void *sap,
  70                                       struct sk_buff *skb);
  71 static int ircomm_tty_control_indication(void *instance, void *sap,
  72                                          struct sk_buff *skb);
  73 static void ircomm_tty_flow_indication(void *instance, void *sap,
  74                                        LOCAL_FLOW cmd);
  75 #ifdef CONFIG_PROC_FS
  76 static const struct file_operations ircomm_tty_proc_fops;
  77 #endif /* CONFIG_PROC_FS */
  78 static struct tty_driver *driver;
  79
  80 static hashbin_t *ircomm_tty = NULL;
  81
  82 static const struct tty_operations ops = {
  83         .open            = ircomm_tty_open,
  84         .close           = ircomm_tty_close,
  85         .write           = ircomm_tty_write,
  86         .write_room      = ircomm_tty_write_room,
  87         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  88         .flush_buffer    = ircomm_tty_flush_buffer,
  89         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  90         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  91         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  92         .throttle        = ircomm_tty_throttle,
  93         .unthrottle      = ircomm_tty_unthrottle,
  94         .send_xchar      = ircomm_tty_send_xchar,
  95         .set_termios     = ircomm_tty_set_termios,
  96         .stop            = ircomm_tty_stop,
  97         .start           = ircomm_tty_start,
  98         .hangup          = ircomm_tty_hangup,
  99         .wait_until_sent = ircomm_tty_wait_until_sent,
 100 #ifdef CONFIG_PROC_FS
 101         .proc_fops       = &ircomm_tty_proc_fops,
 102 #endif /* CONFIG_PROC_FS */
 103 };
 104
 105 /*
 106  * Function ircomm_tty_init()
 107  *
 108  *    Init IrCOMM TTY layer/driver
 109  *
 110  */
 111 static int __init ircomm_tty_init(void)
 112 {
 113         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 114         if (!driver)
 115                 return -ENOMEM;
 116         ircomm_tty = hashbin_new(HB_LOCK);
 117         if (ircomm_tty == NULL) {
 118                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 119                 put_tty_driver(driver);
 120                 return -ENOMEM;
 121         }
 122
 123         driver->owner           = THIS_MODULE;
 124         driver->driver_name     = "ircomm";
 125         driver->name            = "ircomm";
 126         driver->major           = IRCOMM_TTY_MAJOR;
 127         driver->minor_start     = IRCOMM_TTY_MINOR;
 128         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 129         driver->subtype         = SERIAL_TYPE_NORMAL;
 130         driver->init_termios    = tty_std_termios;
 131         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 132         driver->flags           = TTY_DRIVER_REAL_RAW;
 133         tty_set_operations(driver, &ops);
 134         if (tty_register_driver(driver)) {
 135                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 136                            __func__);
 137                 put_tty_driver(driver);
 138                 return -1;
 139         }
 140         return 0;
 141 }
 142
 143 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 144 {
 145         IRDA_DEBUG(0, "%s()\n", __func__ );
 146
 147         IRDA_ASSERT(self != NULL, return;);
 148         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 149
 150         ircomm_tty_shutdown(self);
 151
 152         self->magic = 0;
 153         kfree(self);
 154 }
 155
 156 /*
 157  * Function ircomm_tty_cleanup ()
 158  *
 159  *    Remove IrCOMM TTY layer/driver
 160  *
 161  */
 162 static void __exit ircomm_tty_cleanup(void)
 163 {
 164         int ret;
 165
 166         IRDA_DEBUG(4, "%s()\n", __func__ );
 167
 168         ret = tty_unregister_driver(driver);
 169         if (ret) {
 170                 IRDA_ERROR("%s(), failed to unregister driver\n",
 171                            __func__);
 172                 return;
 173         }
 174
 175         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 176         put_tty_driver(driver);
 177 }
 178
 179 /*
 180  * Function ircomm_startup (self)
 181  *
 182  *
 183  *
 184  */
 185 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 186 {
 187         notify_t notify;
 188         int ret = -ENODEV;
 189
 190         IRDA_DEBUG(2, "%s()\n", __func__ );
 191
 192         IRDA_ASSERT(self != NULL, return -1;);
 193         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 194
 195         /* Check if already open */
 196         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 197                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 198                 return 0;
 199         }
 200
 201         /* Register with IrCOMM */
 202         irda_notify_init(&notify);
 203         /* These callbacks we must handle ourselves */
 204         notify.data_indication       = ircomm_tty_data_indication;
 205         notify.udata_indication      = ircomm_tty_control_indication;
 206         notify.flow_indication       = ircomm_tty_flow_indication;
 207
 208         /* Use the ircomm_tty interface for these ones */
 209         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 210         notify.connect_confirm       = ircomm_tty_connect_confirm;
 211         notify.connect_indication    = ircomm_tty_connect_indication;
 212         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 213         notify.instance = self;
 214
 215         if (!self->ircomm) {
 216                 self->ircomm = ircomm_open(&notify, self->service_type,
 217                                            self->line);
 218         }
 219         if (!self->ircomm)
 220                 goto err;
 221
 222         self->slsap_sel = self->ircomm->slsap_sel;
 223
 224         /* Connect IrCOMM link with remote device */
 225         ret = ircomm_tty_attach_cable(self);
 226         if (ret < 0) {
 227                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 228                 goto err;
 229         }
 230
 231         return 0;
 232 err:
 233         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
 234         return ret;
 235 }
 236
 237 /*
 238  * Function ircomm_block_til_ready (self, filp)
 239  *
 240  *
 241  *
 242  */
 243 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 244                                       struct file *filp)
 245 {
 246         DECLARE_WAITQUEUE(wait, current);
 247         int             retval;
 248         int             do_clocal = 0, extra_count = 0;
 249         unsigned long   flags;
 250         struct tty_struct *tty;
 251
 252         IRDA_DEBUG(2, "%s()\n", __func__ );
 253
 254         tty = self->tty;
 255
 256         /*
 257          * If non-blocking mode is set, or the port is not enabled,
 258          * then make the check up front and then exit.
 259          */
 260         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 261                 /* nonblock mode is set or port is not enabled */
 262                 self->flags |= ASYNC_NORMAL_ACTIVE;
 263                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 264                 return 0;
 265         }
 266
 267         if (tty->termios->c_cflag & CLOCAL) {
 268                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 269                 do_clocal = 1;
 270         }
 271
 272         /* Wait for carrier detect and the line to become
 273          * free (i.e., not in use by the callout).  While we are in
 274          * this loop, self->open_count is dropped by one, so that
 275          * mgsl_close() knows when to free things.  We restore it upon
 276          * exit, either normal or abnormal.
 277          */
 278
 279         retval = 0;
 280         add_wait_queue(&self->open_wait, &wait);
 281
 282         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 283               __FILE__,__LINE__, tty->driver->name, self->open_count );
 284
 285         /* As far as I can see, we protect open_count - Jean II */
 286         spin_lock_irqsave(&self->spinlock, flags);
 287         if (!tty_hung_up_p(filp)) {
 288                 extra_count = 1;
 289                 self->open_count--;
 290         }
 291         spin_unlock_irqrestore(&self->spinlock, flags);
 292         self->blocked_open++;
 293
 294         while (1) {
 295                 if (tty->termios->c_cflag & CBAUD) {
 296                         /* Here, we use to lock those two guys, but
 297                          * as ircomm_param_request() does it itself,
 298                          * I don't see the point (and I see the deadlock).
 299                          * Jean II */
 300                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 301
 302                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 303                 }
 304
 305                 current->state = TASK_INTERRUPTIBLE;
 306
 307                 if (tty_hung_up_p(filp) ||
 308                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 309                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 310                                         -EAGAIN : -ERESTARTSYS;
 311                         break;
 312                 }
 313
 314                 /*
 315                  * Check if link is ready now. Even if CLOCAL is
 316                  * specified, we cannot return before the IrCOMM link is
 317                  * ready
 318                  */
 319                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
 320                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 321                     self->state == IRCOMM_TTY_READY)
 322                 {
 323                         break;
 324                 }
 325
 326                 if (signal_pending(current)) {
 327                         retval = -ERESTARTSYS;
 328                         break;
 329                 }
 330
 331                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 332                       __FILE__,__LINE__, tty->driver->name, self->open_count );
 333
 334                 schedule();
 335         }
 336
 337         __set_current_state(TASK_RUNNING);
 338         remove_wait_queue(&self->open_wait, &wait);
 339
 340         if (extra_count) {
 341                 /* ++ is not atomic, so this should be protected - Jean II */
 342                 spin_lock_irqsave(&self->spinlock, flags);
 343                 self->open_count++;
 344                 spin_unlock_irqrestore(&self->spinlock, flags);
 345         }
 346         self->blocked_open--;
 347
 348         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 349               __FILE__,__LINE__, tty->driver->name, self->open_count);
 350
 351         if (!retval)
 352                 self->flags |= ASYNC_NORMAL_ACTIVE;
 353
 354         return retval;
 355 }
 356
 357 /*
 358  * Function ircomm_tty_open (tty, filp)
 359  *
 360  *    This routine is called when a particular tty device is opened. This
 361  *    routine is mandatory; if this routine is not filled in, the attempted
 362  *    open will fail with ENODEV.
 363  */
 364 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 365 {
 366         struct ircomm_tty_cb *self;
 367         unsigned int line;
 368         unsigned long   flags;
 369         int ret;
 370
 371         IRDA_DEBUG(2, "%s()\n", __func__ );
 372
 373         line = tty->index;
 374         if (line >= IRCOMM_TTY_PORTS)
 375                 return -ENODEV;
 376
 377         /* Check if instance already exists */
 378         self = hashbin_lock_find(ircomm_tty, line, NULL);
 379         if (!self) {
 380                 /* No, so make new instance */
 381                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 382                 if (self == NULL) {
 383                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 384                         return -ENOMEM;
 385                 }
 386
 387                 self->magic = IRCOMM_TTY_MAGIC;
 388                 self->flow = FLOW_STOP;
 389
 390                 self->line = line;
 391                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 392                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 393                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 394                 self->close_delay = 5*HZ/10;
 395                 self->closing_wait = 30*HZ;
 396
 397                 /* Init some important stuff */
 398                 init_timer(&self->watchdog_timer);
 399                 init_waitqueue_head(&self->open_wait);
 400                 init_waitqueue_head(&self->close_wait);
 401                 spin_lock_init(&self->spinlock);
 402
 403                 /*
 404                  * Force TTY into raw mode by default which is usually what
 405                  * we want for IrCOMM and IrLPT. This way applications will
 406                  * not have to twiddle with printcap etc.
 407                  *
 408                  * Note this is completely usafe and doesn't work properly
 409                  */
 410                 tty->termios->c_iflag = 0;
 411                 tty->termios->c_oflag = 0;
 412
 413                 /* Insert into hash */
 414                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 415         }
 416         /* ++ is not atomic, so this should be protected - Jean II */
 417         spin_lock_irqsave(&self->spinlock, flags);
 418         self->open_count++;
 419
 420         tty->driver_data = self;
 421         self->tty = tty;
 422         spin_unlock_irqrestore(&self->spinlock, flags);
 423
 424         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 425                    self->line, self->open_count);
 426
 427         /* Not really used by us, but lets do it anyway */
 428         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 429
 430         /*
 431          * If the port is the middle of closing, bail out now
 432          */
 433         if (tty_hung_up_p(filp) ||
 434             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 435
 436                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 437                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 438                  * IMHO it's either not needed in the first place
 439                  * or for some reason we need to make sure the async
 440                  * closing has been finished - if so, wouldn't we
 441                  * probably better sleep uninterruptible?
 442                  */
 443
 444                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 445                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 446                                      __func__);
 447                         return -ERESTARTSYS;
 448                 }
 449
 450 #ifdef SERIAL_DO_RESTART
 451                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
 452                         -EAGAIN : -ERESTARTSYS);
 453 #else
 454                 return -EAGAIN;
 455 #endif
 456         }
 457
 458         /* Check if this is a "normal" ircomm device, or an irlpt device */
 459         if (line < 0x10) {
 460                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 461                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 462                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 463                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 464                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 465         } else {
 466                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 467                 self->service_type = IRCOMM_3_WIRE_RAW;
 468                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 469         }
 470
 471         ret = ircomm_tty_startup(self);
 472         if (ret)
 473                 return ret;
 474
 475         ret = ircomm_tty_block_til_ready(self, filp);
 476         if (ret) {
 477                 IRDA_DEBUG(2,
 478                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 479                       ret);
 480
 481                 return ret;
 482         }
 483         return 0;
 484 }
 485
 486 /*
 487  * Function ircomm_tty_close (tty, filp)
 488  *
 489  *    This routine is called when a particular tty device is closed.
 490  *
 491  */
 492 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 493 {
 494         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 495         unsigned long flags;
 496
 497         IRDA_DEBUG(0, "%s()\n", __func__ );
 498
 499         if (!tty)
 500                 return;
 501
 502         IRDA_ASSERT(self != NULL, return;);
 503         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 504
 505         spin_lock_irqsave(&self->spinlock, flags);
 506
 507         if (tty_hung_up_p(filp)) {
 508                 spin_unlock_irqrestore(&self->spinlock, flags);
 509
 510                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 511                 return;
 512         }
 513
 514         if ((tty->count == 1) && (self->open_count != 1)) {
 515                 /*
 516                  * Uh, oh.  tty->count is 1, which means that the tty
 517                  * structure will be freed.  state->count should always
 518                  * be one in these conditions.  If it's greater than
 519                  * one, we've got real problems, since it means the
 520                  * serial port won't be shutdown.
 521                  */
 522                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 523                            "tty->count is 1, state->count is %d\n", __func__ ,
 524                            self->open_count);
 525                 self->open_count = 1;
 526         }
 527
 528         if (--self->open_count < 0) {
 529                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 530                            __func__, self->line, self->open_count);
 531                 self->open_count = 0;
 532         }
 533         if (self->open_count) {
 534                 spin_unlock_irqrestore(&self->spinlock, flags);
 535
 536                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 537                 return;
 538         }
 539
 540         /* Hum... Should be test_and_set_bit ??? - Jean II */
 541         set_bit(ASYNC_B_CLOSING, &self->flags);
 542
 543         /* We need to unlock here (we were unlocking at the end of this
 544          * function), because tty_wait_until_sent() may schedule.
 545          * I don't know if the rest should be protected somehow,
 546          * so someone should check. - Jean II */
 547         spin_unlock_irqrestore(&self->spinlock, flags);
 548
 549         /*
 550          * Now we wait for the transmit buffer to clear; and we notify
 551          * the line discipline to only process XON/XOFF characters.
 552          */
 553         tty->closing = 1;
 554         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 555                 tty_wait_until_sent(tty, self->closing_wait);
 556
 557         ircomm_tty_shutdown(self);
 558
 559         tty_driver_flush_buffer(tty);
 560         tty_ldisc_flush(tty);
 561
 562         tty->closing = 0;
 563         self->tty = NULL;
 564
 565         if (self->blocked_open) {
 566                 if (self->close_delay)
 567                         schedule_timeout_interruptible(self->close_delay);
 568                 wake_up_interruptible(&self->open_wait);
 569         }
 570
 571         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 572         wake_up_interruptible(&self->close_wait);
 573 }
 574
 575 /*
 576  * Function ircomm_tty_flush_buffer (tty)
 577  *
 578  *
 579  *
 580  */
 581 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 582 {
 583         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 584
 585         IRDA_ASSERT(self != NULL, return;);
 586         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 587
 588         /*
 589          * Let do_softint() do this to avoid race condition with
 590          * do_softint() ;-)
 591          */
 592         schedule_work(&self->tqueue);
 593 }
 594
 595 /*
 596  * Function ircomm_tty_do_softint (work)
 597  *
 598  *    We use this routine to give the write wakeup to the user at at a
 599  *    safe time (as fast as possible after write have completed). This
 600  *    can be compared to the Tx interrupt.
 601  */
 602 static void ircomm_tty_do_softint(struct work_struct *work)
 603 {
 604         struct ircomm_tty_cb *self =
 605                 container_of(work, struct ircomm_tty_cb, tqueue);
 606         struct tty_struct *tty;
 607         unsigned long flags;
 608         struct sk_buff *skb, *ctrl_skb;
 609
 610         IRDA_DEBUG(2, "%s()\n", __func__ );
 611
 612         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 613                 return;
 614
 615         tty = self->tty;
 616         if (!tty)
 617                 return;
 618
 619         /* Unlink control buffer */
 620         spin_lock_irqsave(&self->spinlock, flags);
 621
 622         ctrl_skb = self->ctrl_skb;
 623         self->ctrl_skb = NULL;
 624
 625         spin_unlock_irqrestore(&self->spinlock, flags);
 626
 627         /* Flush control buffer if any */
 628         if(ctrl_skb) {
 629                 if(self->flow == FLOW_START)
 630                         ircomm_control_request(self->ircomm, ctrl_skb);
 631                 /* Drop reference count - see ircomm_ttp_data_request(). */
 632                 dev_kfree_skb(ctrl_skb);
 633         }
 634
 635         if (tty->hw_stopped)
 636                 return;
 637
 638         /* Unlink transmit buffer */
 639         spin_lock_irqsave(&self->spinlock, flags);
 640
 641         skb = self->tx_skb;
 642         self->tx_skb = NULL;
 643
 644         spin_unlock_irqrestore(&self->spinlock, flags);
 645
 646         /* Flush transmit buffer if any */
 647         if (skb) {
 648                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 649                 /* Drop reference count - see ircomm_ttp_data_request(). */
 650                 dev_kfree_skb(skb);
 651         }
 652
 653         /* Check if user (still) wants to be waken up */
 654         tty_wakeup(tty);
 655 }
 656
 657 /*
 658  * Function ircomm_tty_write (tty, buf, count)
 659  *
 660  *    This routine is called by the kernel to write a series of characters
 661  *    to the tty device. The characters may come from user space or kernel
 662  *    space. This routine will return the number of characters actually
 663  *    accepted for writing. This routine is mandatory.
 664  */
 665 static int ircomm_tty_write(struct tty_struct *tty,
 666                             const unsigned char *buf, int count)
 667 {
 668         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 669         unsigned long flags;
 670         struct sk_buff *skb;
 671         int tailroom = 0;
 672         int len = 0;
 673         int size;
 674
 675         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 676                    tty->hw_stopped);
 677
 678         IRDA_ASSERT(self != NULL, return -1;);
 679         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 680
 681         /* We may receive packets from the TTY even before we have finished
 682          * our setup. Not cool.
 683          * The problem is that we don't know the final header and data size
 684          * to create the proper skb, so any skb we would create would have
 685          * bogus header and data size, so need care.
 686          * We use a bogus header size to safely detect this condition.
 687          * Another problem is that hw_stopped was set to 0 way before it
 688          * should be, so we would drop this skb. It should now be fixed.
 689          * One option is to not accept data until we are properly setup.
 690          * But, I suspect that when it happens, the ppp line discipline
 691          * just "drops" the data, which might screw up connect scripts.
 692          * The second option is to create a "safe skb", with large header
 693          * and small size (see ircomm_tty_open() for values).
 694          * We just need to make sure that when the real values get filled,
 695          * we don't mess up the original "safe skb" (see tx_data_size).
 696          * Jean II */
 697         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 698                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 699 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 700                 /* We didn't consume anything, TTY will retry */
 701                 return 0;
 702 #endif
 703         }
 704
 705         if (count < 1)
 706                 return 0;
 707
 708         /* Protect our manipulation of self->tx_skb and related */
 709         spin_lock_irqsave(&self->spinlock, flags);
 710
 711         /* Fetch current transmit buffer */
 712         skb = self->tx_skb;
 713
 714         /*
 715          * Send out all the data we get, possibly as multiple fragmented
 716          * frames, but this will only happen if the data is larger than the
 717          * max data size. The normal case however is just the opposite, and
 718          * this function may be called multiple times, and will then actually
 719          * defragment the data and send it out as one packet as soon as
 720          * possible, but at a safer point in time
 721          */
 722         while (count) {
 723                 size = count;
 724
 725                 /* Adjust data size to the max data size */
 726                 if (size > self->max_data_size)
 727                         size = self->max_data_size;
 728
 729                 /*
 730                  * Do we already have a buffer ready for transmit, or do
 731                  * we need to allocate a new frame
 732                  */
 733                 if (skb) {
 734                         /*
 735                          * Any room for more data at the end of the current
 736                          * transmit buffer? Cannot use skb_tailroom, since
 737                          * dev_alloc_skb gives us a larger skb than we
 738                          * requested
 739                          * Note : use tx_data_size, because max_data_size
 740                          * may have changed and we don't want to overwrite
 741                          * the skb. - Jean II
 742                          */
 743                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 744                                 /* Adjust data to tailroom */
 745                                 if (size > tailroom)
 746                                         size = tailroom;
 747                         } else {
 748                                 /*
 749                                  * Current transmit frame is full, so break
 750                                  * out, so we can send it as soon as possible
 751                                  */
 752                                 break;
 753                         }
 754                 } else {
 755                         /* Prepare a full sized frame */
 756                         skb = alloc_skb(self->max_data_size+
 757                                         self->max_header_size,
 758                                         GFP_ATOMIC);
 759                         if (!skb) {
 760                                 spin_unlock_irqrestore(&self->spinlock, flags);
 761                                 return -ENOBUFS;
 762                         }
 763                         skb_reserve(skb, self->max_header_size);
 764                         self->tx_skb = skb;
 765                         /* Remember skb size because max_data_size may
 766                          * change later on - Jean II */
 767                         self->tx_data_size = self->max_data_size;
 768                 }
 769
 770                 /* Copy data */
 771                 memcpy(skb_put(skb,size), buf + len, size);
 772
 773                 count -= size;
 774                 len += size;
 775         }
 776
 777         spin_unlock_irqrestore(&self->spinlock, flags);
 778
 779         /*
 780          * Schedule a new thread which will transmit the frame as soon
 781          * as possible, but at a safe point in time. We do this so the
 782          * "user" can give us data multiple times, as PPP does (because of
 783          * its 256 byte tx buffer). We will then defragment and send out
 784          * all this data as one single packet.
 785          */
 786         schedule_work(&self->tqueue);
 787
 788         return len;
 789 }
 790
 791 /*
 792  * Function ircomm_tty_write_room (tty)
 793  *
 794  *    This routine returns the numbers of characters the tty driver will
 795  *    accept for queuing to be written. This number is subject to change as
 796  *    output buffers get emptied, or if the output flow control is acted.
 797  */
 798 static int ircomm_tty_write_room(struct tty_struct *tty)
 799 {
 800         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 801         unsigned long flags;
 802         int ret;
 803
 804         IRDA_ASSERT(self != NULL, return -1;);
 805         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 806
 807 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 808         /* max_header_size tells us if the channel is initialised or not. */
 809         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 810                 /* Don't bother us yet */
 811                 return 0;
 812 #endif
 813
 814         /* Check if we are allowed to transmit any data.
 815          * hw_stopped is the regular flow control.
 816          * Jean II */
 817         if (tty->hw_stopped)
 818                 ret = 0;
 819         else {
 820                 spin_lock_irqsave(&self->spinlock, flags);
 821                 if (self->tx_skb)
 822                         ret = self->tx_data_size - self->tx_skb->len;
 823                 else
 824                         ret = self->max_data_size;
 825                 spin_unlock_irqrestore(&self->spinlock, flags);
 826         }
 827         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 828
 829         return ret;
 830 }
 831
 832 /*
 833  * Function ircomm_tty_wait_until_sent (tty, timeout)
 834  *
 835  *    This routine waits until the device has written out all of the
 836  *    characters in its transmitter FIFO.
 837  */
 838 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 839 {
 840         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 841         unsigned long orig_jiffies, poll_time;
 842         unsigned long flags;
 843
 844         IRDA_DEBUG(2, "%s()\n", __func__ );
 845
 846         IRDA_ASSERT(self != NULL, return;);
 847         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 848
 849         orig_jiffies = jiffies;
 850
 851         /* Set poll time to 200 ms */
 852         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 853
 854         spin_lock_irqsave(&self->spinlock, flags);
 855         while (self->tx_skb && self->tx_skb->len) {
 856                 spin_unlock_irqrestore(&self->spinlock, flags);
 857                 schedule_timeout_interruptible(poll_time);
 858                 spin_lock_irqsave(&self->spinlock, flags);
 859                 if (signal_pending(current))
 860                         break;
 861                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 862                         break;
 863         }
 864         spin_unlock_irqrestore(&self->spinlock, flags);
 865         current->state = TASK_RUNNING;
 866 }
 867
 868 /*
 869  * Function ircomm_tty_throttle (tty)
 870  *
 871  *    This routine notifies the tty driver that input buffers for the line
 872  *    discipline are close to full, and it should somehow signal that no
 873  *    more characters should be sent to the tty.
 874  */
 875 static void ircomm_tty_throttle(struct tty_struct *tty)
 876 {
 877         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 878
 879         IRDA_DEBUG(2, "%s()\n", __func__ );
 880
 881         IRDA_ASSERT(self != NULL, return;);
 882         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 883
 884         /* Software flow control? */
 885         if (I_IXOFF(tty))
 886                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 887
 888         /* Hardware flow control? */
 889         if (tty->termios->c_cflag & CRTSCTS) {
 890                 self->settings.dte &= ~IRCOMM_RTS;
 891                 self->settings.dte |= IRCOMM_DELTA_RTS;
 892
 893                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 894         }
 895
 896         ircomm_flow_request(self->ircomm, FLOW_STOP);
 897 }
 898
 899 /*
 900  * Function ircomm_tty_unthrottle (tty)
 901  *
 902  *    This routine notifies the tty drivers that it should signals that
 903  *    characters can now be sent to the tty without fear of overrunning the
 904  *    input buffers of the line disciplines.
 905  */
 906 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 907 {
 908         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 909
 910         IRDA_DEBUG(2, "%s()\n", __func__ );
 911
 912         IRDA_ASSERT(self != NULL, return;);
 913         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 914
 915         /* Using software flow control? */
 916         if (I_IXOFF(tty)) {
 917                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 918         }
 919
 920         /* Using hardware flow control? */
 921         if (tty->termios->c_cflag & CRTSCTS) {
 922                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 923
 924                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 925                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 926         }
 927         ircomm_flow_request(self->ircomm, FLOW_START);
 928 }
 929
 930 /*
 931  * Function ircomm_tty_chars_in_buffer (tty)
 932  *
 933  *    Indicates if there are any data in the buffer
 934  *
 935  */
 936 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 937 {
 938         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 939         unsigned long flags;
 940         int len = 0;
 941
 942         IRDA_ASSERT(self != NULL, return -1;);
 943         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 944
 945         spin_lock_irqsave(&self->spinlock, flags);
 946
 947         if (self->tx_skb)
 948                 len = self->tx_skb->len;
 949
 950         spin_unlock_irqrestore(&self->spinlock, flags);
 951
 952         return len;
 953 }
 954
 955 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 956 {
 957         unsigned long flags;
 958
 959         IRDA_ASSERT(self != NULL, return;);
 960         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 961
 962         IRDA_DEBUG(0, "%s()\n", __func__ );
 963
 964         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 965                 return;
 966
 967         ircomm_tty_detach_cable(self);
 968
 969         spin_lock_irqsave(&self->spinlock, flags);
 970
 971         del_timer(&self->watchdog_timer);
 972
 973         /* Free parameter buffer */
 974         if (self->ctrl_skb) {
 975                 dev_kfree_skb(self->ctrl_skb);
 976                 self->ctrl_skb = NULL;
 977         }
 978
 979         /* Free transmit buffer */
 980         if (self->tx_skb) {
 981                 dev_kfree_skb(self->tx_skb);
 982                 self->tx_skb = NULL;
 983         }
 984
 985         if (self->ircomm) {
 986                 ircomm_close(self->ircomm);
 987                 self->ircomm = NULL;
 988         }
 989
 990         spin_unlock_irqrestore(&self->spinlock, flags);
 991 }
 992
 993 /*
 994  * Function ircomm_tty_hangup (tty)
 995  *
 996  *    This routine notifies the tty driver that it should hangup the tty
 997  *    device.
 998  *
 999  */
1000 static void ircomm_tty_hangup(struct tty_struct *tty)
1001 {
1002         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1003         unsigned long   flags;
1004
1005         IRDA_DEBUG(0, "%s()\n", __func__ );
1006
1007         IRDA_ASSERT(self != NULL, return;);
1008         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1009
1010         if (!tty)
1011                 return;
1012
1013         /* ircomm_tty_flush_buffer(tty); */
1014         ircomm_tty_shutdown(self);
1015
1016         /* I guess we need to lock here - Jean II */
1017         spin_lock_irqsave(&self->spinlock, flags);
1018         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1019         self->tty = NULL;
1020         self->open_count = 0;
1021         spin_unlock_irqrestore(&self->spinlock, flags);
1022
1023         wake_up_interruptible(&self->open_wait);
1024 }
1025
1026 /*
1027  * Function ircomm_tty_send_xchar (tty, ch)
1028  *
1029  *    This routine is used to send a high-priority XON/XOFF character to
1030  *    the device.
1031  */
1032 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1033 {
1034         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1035 }
1036
1037 /*
1038  * Function ircomm_tty_start (tty)
1039  *
1040  *    This routine notifies the tty driver that it resume sending
1041  *    characters to the tty device.
1042  */
1043 void ircomm_tty_start(struct tty_struct *tty)
1044 {
1045         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1046
1047         ircomm_flow_request(self->ircomm, FLOW_START);
1048 }
1049
1050 /*
1051  * Function ircomm_tty_stop (tty)
1052  *
1053  *     This routine notifies the tty driver that it should stop outputting
1054  *     characters to the tty device.
1055  */
1056 static void ircomm_tty_stop(struct tty_struct *tty)
1057 {
1058         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1059
1060         IRDA_ASSERT(self != NULL, return;);
1061         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1062
1063         ircomm_flow_request(self->ircomm, FLOW_STOP);
1064 }
1065
1066 /*
1067  * Function ircomm_check_modem_status (self)
1068  *
1069  *    Check for any changes in the DCE's line settings. This function should
1070  *    be called whenever the dce parameter settings changes, to update the
1071  *    flow control settings and other things
1072  */
1073 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1074 {
1075         struct tty_struct *tty;
1076         int status;
1077
1078         IRDA_DEBUG(0, "%s()\n", __func__ );
1079
1080         IRDA_ASSERT(self != NULL, return;);
1081         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1082
1083         tty = self->tty;
1084
1085         status = self->settings.dce;
1086
1087         if (status & IRCOMM_DCE_DELTA_ANY) {
1088                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1089         }
1090         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1091                 IRDA_DEBUG(2,
1092                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1093                            (status & IRCOMM_CD) ? "on" : "off");
1094
1095                 if (status & IRCOMM_CD) {
1096                         wake_up_interruptible(&self->open_wait);
1097                 } else {
1098                         IRDA_DEBUG(2,
1099                                    "%s(), Doing serial hangup..\n", __func__ );
1100                         if (tty)
1101                                 tty_hangup(tty);
1102
1103                         /* Hangup will remote the tty, so better break out */
1104                         return;
1105                 }
1106         }
1107         if (self->flags & ASYNC_CTS_FLOW) {
1108                 if (tty->hw_stopped) {
1109                         if (status & IRCOMM_CTS) {
1110                                 IRDA_DEBUG(2,
1111                                            "%s(), CTS tx start...\n", __func__ );
1112                                 tty->hw_stopped = 0;
1113
1114                                 /* Wake up processes blocked on open */
1115                                 wake_up_interruptible(&self->open_wait);
1116
1117                                 schedule_work(&self->tqueue);
1118                                 return;
1119                         }
1120                 } else {
1121                         if (!(status & IRCOMM_CTS)) {
1122                                 IRDA_DEBUG(2,
1123                                            "%s(), CTS tx stop...\n", __func__ );
1124                                 tty->hw_stopped = 1;
1125                         }
1126                 }
1127         }
1128 }
1129
1130 /*
1131  * Function ircomm_tty_data_indication (instance, sap, skb)
1132  *
1133  *    Handle incoming data, and deliver it to the line discipline
1134  *
1135  */
1136 static int ircomm_tty_data_indication(void *instance, void *sap,
1137                                       struct sk_buff *skb)
1138 {
1139         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1140         struct tty_ldisc *ld;
1141
1142         IRDA_DEBUG(2, "%s()\n", __func__ );
1143
1144         IRDA_ASSERT(self != NULL, return -1;);
1145         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1146         IRDA_ASSERT(skb != NULL, return -1;);
1147
1148         if (!self->tty) {
1149                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1150                 return 0;
1151         }
1152
1153         /*
1154          * If we receive data when hardware is stopped then something is wrong.
1155          * We try to poll the peers line settings to check if we are up todate.
1156          * Devices like WinCE can do this, and since they don't send any
1157          * params, we can just as well declare the hardware for running.
1158          */
1159         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1160                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1161                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1162
1163                 /* We can just as well declare the hardware for running */
1164                 ircomm_tty_send_initial_parameters(self);
1165                 ircomm_tty_link_established(self);
1166         }
1167
1168         /*
1169          * Just give it over to the line discipline. There is no need to
1170          * involve the flip buffers, since we are not running in an interrupt
1171          * handler
1172          */
1173
1174         ld = tty_ldisc_ref(self->tty);
1175         if (ld)
1176                 ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len);
1177         tty_ldisc_deref(ld);
1178
1179         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1180
1181         return 0;
1182 }
1183
1184 /*
1185  * Function ircomm_tty_control_indication (instance, sap, skb)
1186  *
1187  *    Parse all incoming parameters (easy!)
1188  *
1189  */
1190 static int ircomm_tty_control_indication(void *instance, void *sap,
1191                                          struct sk_buff *skb)
1192 {
1193         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1194         int clen;
1195
1196         IRDA_DEBUG(4, "%s()\n", __func__ );
1197
1198         IRDA_ASSERT(self != NULL, return -1;);
1199         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1200         IRDA_ASSERT(skb != NULL, return -1;);
1201
1202         clen = skb->data[0];
1203
1204         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1205                                &ircomm_param_info);
1206
1207         /* No need to kfree_skb - see ircomm_control_indication() */
1208
1209         return 0;
1210 }
1211
1212 /*
1213  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1214  *
1215  *    This function is called by IrTTP when it wants us to slow down the
1216  *    transmission of data. We just mark the hardware as stopped, and wait
1217  *    for IrTTP to notify us that things are OK again.
1218  */
1219 static void ircomm_tty_flow_indication(void *instance, void *sap,
1220                                        LOCAL_FLOW cmd)
1221 {
1222         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1223         struct tty_struct *tty;
1224
1225         IRDA_ASSERT(self != NULL, return;);
1226         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1227
1228         tty = self->tty;
1229
1230         switch (cmd) {
1231         case FLOW_START:
1232                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1233                 tty->hw_stopped = 0;
1234
1235                 /* ircomm_tty_do_softint will take care of the rest */
1236                 schedule_work(&self->tqueue);
1237                 break;
1238         default:  /* If we get here, something is very wrong, better stop */
1239         case FLOW_STOP:
1240                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1241                 tty->hw_stopped = 1;
1242                 break;
1243         }
1244         self->flow = cmd;
1245 }
1246
1247 #ifdef CONFIG_PROC_FS
1248 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1249 {
1250         char sep;
1251
1252         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1253
1254         seq_puts(m, "Service type: ");
1255         if (self->service_type & IRCOMM_9_WIRE)
1256                 seq_puts(m, "9_WIRE");
1257         else if (self->service_type & IRCOMM_3_WIRE)
1258                 seq_puts(m, "3_WIRE");
1259         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1260                 seq_puts(m, "3_WIRE_RAW");
1261         else
1262                 seq_puts(m, "No common service type!\n");
1263         seq_putc(m, '\n');
1264
1265         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1266
1267         seq_printf(m, "DTE status:");
1268         sep = ' ';
1269         if (self->settings.dte & IRCOMM_RTS) {
1270                 seq_printf(m, "%cRTS", sep);
1271                 sep = '|';
1272         }
1273         if (self->settings.dte & IRCOMM_DTR) {
1274                 seq_printf(m, "%cDTR", sep);
1275                 sep = '|';
1276         }
1277         seq_putc(m, '\n');
1278
1279         seq_puts(m, "DCE status:");
1280         sep = ' ';
1281         if (self->settings.dce & IRCOMM_CTS) {
1282                 seq_printf(m, "%cCTS", sep);
1283                 sep = '|';
1284         }
1285         if (self->settings.dce & IRCOMM_DSR) {
1286                 seq_printf(m, "%cDSR", sep);
1287                 sep = '|';
1288         }
1289         if (self->settings.dce & IRCOMM_CD) {
1290                 seq_printf(m, "%cCD", sep);
1291                 sep = '|';
1292         }
1293         if (self->settings.dce & IRCOMM_RI) {
1294                 seq_printf(m, "%cRI", sep);
1295                 sep = '|';
1296         }
1297         seq_putc(m, '\n');
1298
1299         seq_puts(m, "Configuration: ");
1300         if (!self->settings.null_modem)
1301                 seq_puts(m, "DTE <-> DCE\n");
1302         else
1303                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1304
1305         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1306
1307         seq_puts(m, "Flow control:");
1308         sep = ' ';
1309         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1310                 seq_printf(m, "%cXON_XOFF_IN", sep);
1311                 sep = '|';
1312         }
1313         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1314                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1315                 sep = '|';
1316         }
1317         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1318                 seq_printf(m, "%cRTS_CTS_IN", sep);
1319                 sep = '|';
1320         }
1321         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1322                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1323                 sep = '|';
1324         }
1325         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1326                 seq_printf(m, "%cDSR_DTR_IN", sep);
1327                 sep = '|';
1328         }
1329         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1330                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1331                 sep = '|';
1332         }
1333         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1334                 seq_printf(m, "%cENQ_ACK_IN", sep);
1335                 sep = '|';
1336         }
1337         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1338                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1339                 sep = '|';
1340         }
1341         seq_putc(m, '\n');
1342
1343         seq_puts(m, "Flags:");
1344         sep = ' ';
1345         if (self->flags & ASYNC_CTS_FLOW) {
1346                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1347                 sep = '|';
1348         }
1349         if (self->flags & ASYNC_CHECK_CD) {
1350                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1351                 sep = '|';
1352         }
1353         if (self->flags & ASYNC_INITIALIZED) {
1354                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1355                 sep = '|';
1356         }
1357         if (self->flags & ASYNC_LOW_LATENCY) {
1358                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1359                 sep = '|';
1360         }
1361         if (self->flags & ASYNC_CLOSING) {
1362                 seq_printf(m, "%cASYNC_CLOSING", sep);
1363                 sep = '|';
1364         }
1365         if (self->flags & ASYNC_NORMAL_ACTIVE) {
1366                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1367                 sep = '|';
1368         }
1369         seq_putc(m, '\n');
1370
1371         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1372         seq_printf(m, "Open count: %d\n", self->open_count);
1373         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1374         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1375
1376         if (self->tty)
1377                 seq_printf(m, "Hardware: %s\n",
1378                                self->tty->hw_stopped ? "Stopped" : "Running");
1379 }
1380
1381 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1382 {
1383         struct ircomm_tty_cb *self;
1384         unsigned long flags;
1385
1386         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1387
1388         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1389         while (self != NULL) {
1390                 if (self->magic != IRCOMM_TTY_MAGIC)
1391                         break;
1392
1393                 ircomm_tty_line_info(self, m);
1394                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1395         }
1396         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1397         return 0;
1398 }
1399
1400 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1401 {
1402         return single_open(file, ircomm_tty_proc_show, NULL);
1403 }
1404
1405 static const struct file_operations ircomm_tty_proc_fops = {
1406         .owner          = THIS_MODULE,
1407         .open           = ircomm_tty_proc_open,
1408         .read           = seq_read,
1409         .llseek         = seq_lseek,
1410         .release        = single_release,
1411 };
1412 #endif /* CONFIG_PROC_FS */
1413
1414 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1415 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1416 MODULE_LICENSE("GPL");
1417 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1418
1419 module_init(ircomm_tty_init);
1420 module_exit(ircomm_tty_cleanup);