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/config.h>
  34 #include <linux/init.h>
  35 #include <linux/module.h>
  36 #include <linux/fs.h>
  37 #include <linux/sched.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(void *private_);
  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 int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
  77                                 int *eof, void *unused);
  78 #endif /* CONFIG_PROC_FS */
  79 static struct tty_driver *driver;
  80
  81 hashbin_t *ircomm_tty = NULL;
  82
  83 static struct tty_operations ops = {
  84         .open            = ircomm_tty_open,
  85         .close           = ircomm_tty_close,
  86         .write           = ircomm_tty_write,
  87         .write_room      = ircomm_tty_write_room,
  88         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  89         .flush_buffer    = ircomm_tty_flush_buffer,
  90         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  91         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  92         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  93         .throttle        = ircomm_tty_throttle,
  94         .unthrottle      = ircomm_tty_unthrottle,
  95         .send_xchar      = ircomm_tty_send_xchar,
  96         .set_termios     = ircomm_tty_set_termios,
  97         .stop            = ircomm_tty_stop,
  98         .start           = ircomm_tty_start,
  99         .hangup          = ircomm_tty_hangup,
 100         .wait_until_sent = ircomm_tty_wait_until_sent,
 101 #ifdef CONFIG_PROC_FS
 102         .read_proc       = ircomm_tty_read_proc,
 103 #endif /* CONFIG_PROC_FS */
 104 };
 105
 106 /*
 107  * Function ircomm_tty_init()
 108  *
 109  *    Init IrCOMM TTY layer/driver
 110  *
 111  */
 112 static int __init ircomm_tty_init(void)
 113 {
 114         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 115         if (!driver)
 116                 return -ENOMEM;
 117         ircomm_tty = hashbin_new(HB_LOCK);
 118         if (ircomm_tty == NULL) {
 119                 ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
 120                 put_tty_driver(driver);
 121                 return -ENOMEM;
 122         }
 123
 124         driver->owner           = THIS_MODULE;
 125         driver->driver_name     = "ircomm";
 126         driver->name            = "ircomm";
 127         driver->devfs_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                 ERROR("%s(): Couldn't register serial driver\n", __FUNCTION__);
 138                 put_tty_driver(driver);
 139                 return -1;
 140         }
 141         return 0;
 142 }
 143
 144 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 145 {
 146         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 147
 148         ASSERT(self != NULL, return;);
 149         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 150
 151         ircomm_tty_shutdown(self);
 152
 153         self->magic = 0;
 154         kfree(self);
 155 }
 156
 157 /*
 158  * Function ircomm_tty_cleanup ()
 159  *
 160  *    Remove IrCOMM TTY layer/driver
 161  *
 162  */
 163 static void __exit ircomm_tty_cleanup(void)
 164 {
 165         int ret;
 166
 167         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 168
 169         ret = tty_unregister_driver(driver);
 170         if (ret) {
 171                 ERROR("%s(), failed to unregister driver\n", __FUNCTION__);
 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", __FUNCTION__ );
 191
 192         ASSERT(self != NULL, return -1;);
 193         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", __FUNCTION__ );
 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                 ERROR("%s(), error attaching cable!\n", __FUNCTION__);
 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", __FUNCTION__ );
 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", __FUNCTION__ );
 264                 return 0;
 265         }
 266
 267         if (tty->termios->c_cflag & CLOCAL) {
 268                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ );
 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", __FUNCTION__ );
 372
 373         line = tty->index;
 374         if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
 375                 return -ENODEV;
 376         }
 377
 378         /* Check if instance already exists */
 379         self = hashbin_lock_find(ircomm_tty, line, NULL);
 380         if (!self) {
 381                 /* No, so make new instance */
 382                 self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 383                 if (self == NULL) {
 384                         ERROR("%s(), kmalloc failed!\n", __FUNCTION__);
 385                         return -ENOMEM;
 386                 }
 387                 memset(self, 0, sizeof(struct ircomm_tty_cb));
 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, self);
 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                 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", __FUNCTION__ , 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                         WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 446                                 __FUNCTION__);
 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", __FUNCTION__ );
 465         } else {
 466                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ );
 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", __FUNCTION__ ,
 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", __FUNCTION__ );
 498
 499         if (!tty)
 500                 return;
 501
 502         ASSERT(self != NULL, return;);
 503         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", __FUNCTION__ );
 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", __FUNCTION__ ,
 524                            self->open_count);
 525                 self->open_count = 1;
 526         }
 527
 528         if (--self->open_count < 0) {
 529                 ERROR("%s(), bad serial port count for ttys%d: %d\n",
 530                       __FUNCTION__, 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", __FUNCTION__ );
 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         if (tty->driver->flush_buffer)
 560                 tty->driver->flush_buffer(tty);
 561         if (tty->ldisc.flush_buffer)
 562                 tty->ldisc.flush_buffer(tty);
 563
 564         tty->closing = 0;
 565         self->tty = NULL;
 566
 567         if (self->blocked_open) {
 568                 if (self->close_delay) {
 569                         current->state = TASK_INTERRUPTIBLE;
 570                         schedule_timeout(self->close_delay);
 571                 }
 572                 wake_up_interruptible(&self->open_wait);
 573         }
 574
 575         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 576         wake_up_interruptible(&self->close_wait);
 577 }
 578
 579 /*
 580  * Function ircomm_tty_flush_buffer (tty)
 581  *
 582  *
 583  *
 584  */
 585 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 586 {
 587         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 588
 589         ASSERT(self != NULL, return;);
 590         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 591
 592         /*
 593          * Let do_softint() do this to avoid race condition with
 594          * do_softint() ;-)
 595          */
 596         schedule_work(&self->tqueue);
 597 }
 598
 599 /*
 600  * Function ircomm_tty_do_softint (private_)
 601  *
 602  *    We use this routine to give the write wakeup to the user at at a
 603  *    safe time (as fast as possible after write have completed). This
 604  *    can be compared to the Tx interrupt.
 605  */
 606 static void ircomm_tty_do_softint(void *private_)
 607 {
 608         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
 609         struct tty_struct *tty;
 610         unsigned long flags;
 611         struct sk_buff *skb, *ctrl_skb;
 612
 613         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 614
 615         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 616                 return;
 617
 618         tty = self->tty;
 619         if (!tty)
 620                 return;
 621
 622         /* Unlink control buffer */
 623         spin_lock_irqsave(&self->spinlock, flags);
 624
 625         ctrl_skb = self->ctrl_skb;
 626         self->ctrl_skb = NULL;
 627
 628         spin_unlock_irqrestore(&self->spinlock, flags);
 629
 630         /* Flush control buffer if any */
 631         if(ctrl_skb) {
 632                 if(self->flow == FLOW_START)
 633                         ircomm_control_request(self->ircomm, ctrl_skb);
 634                 /* Drop reference count - see ircomm_ttp_data_request(). */
 635                 dev_kfree_skb(ctrl_skb);
 636         }
 637
 638         if (tty->hw_stopped)
 639                 return;
 640
 641         /* Unlink transmit buffer */
 642         spin_lock_irqsave(&self->spinlock, flags);
 643
 644         skb = self->tx_skb;
 645         self->tx_skb = NULL;
 646
 647         spin_unlock_irqrestore(&self->spinlock, flags);
 648
 649         /* Flush transmit buffer if any */
 650         if (skb) {
 651                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 652                 /* Drop reference count - see ircomm_ttp_data_request(). */
 653                 dev_kfree_skb(skb);
 654         }
 655
 656         /* Check if user (still) wants to be waken up */
 657         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 658             tty->ldisc.write_wakeup)
 659         {
 660                 (tty->ldisc.write_wakeup)(tty);
 661         }
 662         wake_up_interruptible(&tty->write_wait);
 663 }
 664
 665 /*
 666  * Function ircomm_tty_write (tty, buf, count)
 667  *
 668  *    This routine is called by the kernel to write a series of characters
 669  *    to the tty device. The characters may come from user space or kernel
 670  *    space. This routine will return the number of characters actually
 671  *    accepted for writing. This routine is mandatory.
 672  */
 673 static int ircomm_tty_write(struct tty_struct *tty,
 674                             const unsigned char *ubuf, int count)
 675 {
 676         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 677         unsigned char *kbuf;            /* Buffer in kernel space */
 678         unsigned long flags;
 679         struct sk_buff *skb;
 680         int tailroom = 0;
 681         int len = 0;
 682         int size;
 683
 684         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count,
 685                    tty->hw_stopped);
 686
 687         ASSERT(self != NULL, return -1;);
 688         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 689
 690         /* We may receive packets from the TTY even before we have finished
 691          * our setup. Not cool.
 692          * The problem is that we don't know the final header and data size
 693          * to create the proper skb, so any skb we would create would have
 694          * bogus header and data size, so need care.
 695          * We use a bogus header size to safely detect this condition.
 696          * Another problem is that hw_stopped was set to 0 way before it
 697          * should be, so we would drop this skb. It should now be fixed.
 698          * One option is to not accept data until we are properly setup.
 699          * But, I suspect that when it happens, the ppp line discipline
 700          * just "drops" the data, which might screw up connect scripts.
 701          * The second option is to create a "safe skb", with large header
 702          * and small size (see ircomm_tty_open() for values).
 703          * We just need to make sure that when the real values get filled,
 704          * we don't mess up the original "safe skb" (see tx_data_size).
 705          * Jean II */
 706         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 707                 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
 708 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 709                 /* We didn't consume anything, TTY will retry */
 710                 return 0;
 711 #endif
 712         }
 713
 714         if (count < 1)
 715                 return 0;
 716
 717         /* The buffer is already in kernel space */
 718         kbuf = (unsigned char *) ubuf;
 719
 720         /* Protect our manipulation of self->tx_skb and related */
 721         spin_lock_irqsave(&self->spinlock, flags);
 722
 723         /* Fetch current transmit buffer */
 724         skb = self->tx_skb;
 725
 726         /*
 727          * Send out all the data we get, possibly as multiple fragmented
 728          * frames, but this will only happen if the data is larger than the
 729          * max data size. The normal case however is just the opposite, and
 730          * this function may be called multiple times, and will then actually
 731          * defragment the data and send it out as one packet as soon as
 732          * possible, but at a safer point in time
 733          */
 734         while (count) {
 735                 size = count;
 736
 737                 /* Adjust data size to the max data size */
 738                 if (size > self->max_data_size)
 739                         size = self->max_data_size;
 740
 741                 /*
 742                  * Do we already have a buffer ready for transmit, or do
 743                  * we need to allocate a new frame
 744                  */
 745                 if (skb) {
 746                         /*
 747                          * Any room for more data at the end of the current
 748                          * transmit buffer? Cannot use skb_tailroom, since
 749                          * dev_alloc_skb gives us a larger skb than we
 750                          * requested
 751                          * Note : use tx_data_size, because max_data_size
 752                          * may have changed and we don't want to overwrite
 753                          * the skb. - Jean II
 754                          */
 755                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 756                                 /* Adjust data to tailroom */
 757                                 if (size > tailroom)
 758                                         size = tailroom;
 759                         } else {
 760                                 /*
 761                                  * Current transmit frame is full, so break
 762                                  * out, so we can send it as soon as possible
 763                                  */
 764                                 break;
 765                         }
 766                 } else {
 767                         /* Prepare a full sized frame */
 768                         skb = dev_alloc_skb(self->max_data_size+
 769                                             self->max_header_size);
 770                         if (!skb) {
 771                                 spin_unlock_irqrestore(&self->spinlock, flags);
 772                                 return -ENOBUFS;
 773                         }
 774                         skb_reserve(skb, self->max_header_size);
 775                         self->tx_skb = skb;
 776                         /* Remember skb size because max_data_size may
 777                          * change later on - Jean II */
 778                         self->tx_data_size = self->max_data_size;
 779                 }
 780
 781                 /* Copy data */
 782                 memcpy(skb_put(skb,size), kbuf + len, size);
 783
 784                 count -= size;
 785                 len += size;
 786         }
 787
 788         spin_unlock_irqrestore(&self->spinlock, flags);
 789
 790         /*
 791          * Schedule a new thread which will transmit the frame as soon
 792          * as possible, but at a safe point in time. We do this so the
 793          * "user" can give us data multiple times, as PPP does (because of
 794          * its 256 byte tx buffer). We will then defragment and send out
 795          * all this data as one single packet.
 796          */
 797         schedule_work(&self->tqueue);
 798
 799         return len;
 800 }
 801
 802 /*
 803  * Function ircomm_tty_write_room (tty)
 804  *
 805  *    This routine returns the numbers of characters the tty driver will
 806  *    accept for queuing to be written. This number is subject to change as
 807  *    output buffers get emptied, or if the output flow control is acted.
 808  */
 809 static int ircomm_tty_write_room(struct tty_struct *tty)
 810 {
 811         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 812         unsigned long flags;
 813         int ret;
 814
 815         ASSERT(self != NULL, return -1;);
 816         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 817
 818 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 819         /* max_header_size tells us if the channel is initialised or not. */
 820         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 821                 /* Don't bother us yet */
 822                 return 0;
 823 #endif
 824
 825         /* Check if we are allowed to transmit any data.
 826          * hw_stopped is the regular flow control.
 827          * Jean II */
 828         if (tty->hw_stopped)
 829                 ret = 0;
 830         else {
 831                 spin_lock_irqsave(&self->spinlock, flags);
 832                 if (self->tx_skb)
 833                         ret = self->tx_data_size - self->tx_skb->len;
 834                 else
 835                         ret = self->max_data_size;
 836                 spin_unlock_irqrestore(&self->spinlock, flags);
 837         }
 838         IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret);
 839
 840         return ret;
 841 }
 842
 843 /*
 844  * Function ircomm_tty_wait_until_sent (tty, timeout)
 845  *
 846  *    This routine waits until the device has written out all of the
 847  *    characters in its transmitter FIFO.
 848  */
 849 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 850 {
 851         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 852         unsigned long orig_jiffies, poll_time;
 853         unsigned long flags;
 854
 855         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 856
 857         ASSERT(self != NULL, return;);
 858         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 859
 860         orig_jiffies = jiffies;
 861
 862         /* Set poll time to 200 ms */
 863         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 864
 865         spin_lock_irqsave(&self->spinlock, flags);
 866         while (self->tx_skb && self->tx_skb->len) {
 867                 spin_unlock_irqrestore(&self->spinlock, flags);
 868                 current->state = TASK_INTERRUPTIBLE;
 869                 schedule_timeout(poll_time);
 870                 spin_lock_irqsave(&self->spinlock, flags);
 871                 if (signal_pending(current))
 872                         break;
 873                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 874                         break;
 875         }
 876         spin_unlock_irqrestore(&self->spinlock, flags);
 877         current->state = TASK_RUNNING;
 878 }
 879
 880 /*
 881  * Function ircomm_tty_throttle (tty)
 882  *
 883  *    This routine notifies the tty driver that input buffers for the line
 884  *    discipline are close to full, and it should somehow signal that no
 885  *    more characters should be sent to the tty.
 886  */
 887 static void ircomm_tty_throttle(struct tty_struct *tty)
 888 {
 889         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 890
 891         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 892
 893         ASSERT(self != NULL, return;);
 894         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 895
 896         /* Software flow control? */
 897         if (I_IXOFF(tty))
 898                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 899
 900         /* Hardware flow control? */
 901         if (tty->termios->c_cflag & CRTSCTS) {
 902                 self->settings.dte &= ~IRCOMM_RTS;
 903                 self->settings.dte |= IRCOMM_DELTA_RTS;
 904
 905                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 906         }
 907
 908         ircomm_flow_request(self->ircomm, FLOW_STOP);
 909 }
 910
 911 /*
 912  * Function ircomm_tty_unthrottle (tty)
 913  *
 914  *    This routine notifies the tty drivers that it should signals that
 915  *    characters can now be sent to the tty without fear of overrunning the
 916  *    input buffers of the line disciplines.
 917  */
 918 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 919 {
 920         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 921
 922         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 923
 924         ASSERT(self != NULL, return;);
 925         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 926
 927         /* Using software flow control? */
 928         if (I_IXOFF(tty)) {
 929                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 930         }
 931
 932         /* Using hardware flow control? */
 933         if (tty->termios->c_cflag & CRTSCTS) {
 934                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 935
 936                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 937                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ );
 938         }
 939         ircomm_flow_request(self->ircomm, FLOW_START);
 940 }
 941
 942 /*
 943  * Function ircomm_tty_chars_in_buffer (tty)
 944  *
 945  *    Indicates if there are any data in the buffer
 946  *
 947  */
 948 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 949 {
 950         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 951         unsigned long flags;
 952         int len = 0;
 953
 954         ASSERT(self != NULL, return -1;);
 955         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 956
 957         spin_lock_irqsave(&self->spinlock, flags);
 958
 959         if (self->tx_skb)
 960                 len = self->tx_skb->len;
 961
 962         spin_unlock_irqrestore(&self->spinlock, flags);
 963
 964         return len;
 965 }
 966
 967 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 968 {
 969         unsigned long flags;
 970
 971         ASSERT(self != NULL, return;);
 972         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 973
 974         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 975
 976         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 977                 return;
 978
 979         ircomm_tty_detach_cable(self);
 980
 981         spin_lock_irqsave(&self->spinlock, flags);
 982
 983         del_timer(&self->watchdog_timer);
 984
 985         /* Free parameter buffer */
 986         if (self->ctrl_skb) {
 987                 dev_kfree_skb(self->ctrl_skb);
 988                 self->ctrl_skb = NULL;
 989         }
 990
 991         /* Free transmit buffer */
 992         if (self->tx_skb) {
 993                 dev_kfree_skb(self->tx_skb);
 994                 self->tx_skb = NULL;
 995         }
 996
 997         if (self->ircomm) {
 998                 ircomm_close(self->ircomm);
 999                 self->ircomm = NULL;
1000         }
1001
1002         spin_unlock_irqrestore(&self->spinlock, flags);
1003 }
1004
1005 /*
1006  * Function ircomm_tty_hangup (tty)
1007  *
1008  *    This routine notifies the tty driver that it should hangup the tty
1009  *    device.
1010  *
1011  */
1012 static void ircomm_tty_hangup(struct tty_struct *tty)
1013 {
1014         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1015         unsigned long   flags;
1016
1017         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1018
1019         ASSERT(self != NULL, return;);
1020         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1021
1022         if (!tty)
1023                 return;
1024
1025         /* ircomm_tty_flush_buffer(tty); */
1026         ircomm_tty_shutdown(self);
1027
1028         /* I guess we need to lock here - Jean II */
1029         spin_lock_irqsave(&self->spinlock, flags);
1030         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1031         self->tty = NULL;
1032         self->open_count = 0;
1033         spin_unlock_irqrestore(&self->spinlock, flags);
1034
1035         wake_up_interruptible(&self->open_wait);
1036 }
1037
1038 /*
1039  * Function ircomm_tty_send_xchar (tty, ch)
1040  *
1041  *    This routine is used to send a high-priority XON/XOFF character to
1042  *    the device.
1043  */
1044 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1045 {
1046         IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ );
1047 }
1048
1049 /*
1050  * Function ircomm_tty_start (tty)
1051  *
1052  *    This routine notifies the tty driver that it resume sending
1053  *    characters to the tty device.
1054  */
1055 void ircomm_tty_start(struct tty_struct *tty)
1056 {
1057         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1058
1059         ircomm_flow_request(self->ircomm, FLOW_START);
1060 }
1061
1062 /*
1063  * Function ircomm_tty_stop (tty)
1064  *
1065  *     This routine notifies the tty driver that it should stop outputting
1066  *     characters to the tty device.
1067  */
1068 static void ircomm_tty_stop(struct tty_struct *tty)
1069 {
1070         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1071
1072         ASSERT(self != NULL, return;);
1073         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1074
1075         ircomm_flow_request(self->ircomm, FLOW_STOP);
1076 }
1077
1078 /*
1079  * Function ircomm_check_modem_status (self)
1080  *
1081  *    Check for any changes in the DCE's line settings. This function should
1082  *    be called whenever the dce parameter settings changes, to update the
1083  *    flow control settings and other things
1084  */
1085 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1086 {
1087         struct tty_struct *tty;
1088         int status;
1089
1090         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1091
1092         ASSERT(self != NULL, return;);
1093         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1094
1095         tty = self->tty;
1096
1097         status = self->settings.dce;
1098
1099         if (status & IRCOMM_DCE_DELTA_ANY) {
1100                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1101         }
1102         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1103                 IRDA_DEBUG(2,
1104                            "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line,
1105                            (status & IRCOMM_CD) ? "on" : "off");
1106
1107                 if (status & IRCOMM_CD) {
1108                         wake_up_interruptible(&self->open_wait);
1109                 } else {
1110                         IRDA_DEBUG(2,
1111                                    "%s(), Doing serial hangup..\n", __FUNCTION__ );
1112                         if (tty)
1113                                 tty_hangup(tty);
1114
1115                         /* Hangup will remote the tty, so better break out */
1116                         return;
1117                 }
1118         }
1119         if (self->flags & ASYNC_CTS_FLOW) {
1120                 if (tty->hw_stopped) {
1121                         if (status & IRCOMM_CTS) {
1122                                 IRDA_DEBUG(2,
1123                                            "%s(), CTS tx start...\n", __FUNCTION__ );
1124                                 tty->hw_stopped = 0;
1125
1126                                 /* Wake up processes blocked on open */
1127                                 wake_up_interruptible(&self->open_wait);
1128
1129                                 schedule_work(&self->tqueue);
1130                                 return;
1131                         }
1132                 } else {
1133                         if (!(status & IRCOMM_CTS)) {
1134                                 IRDA_DEBUG(2,
1135                                            "%s(), CTS tx stop...\n", __FUNCTION__ );
1136                                 tty->hw_stopped = 1;
1137                         }
1138                 }
1139         }
1140 }
1141
1142 /*
1143  * Function ircomm_tty_data_indication (instance, sap, skb)
1144  *
1145  *    Handle incoming data, and deliver it to the line discipline
1146  *
1147  */
1148 static int ircomm_tty_data_indication(void *instance, void *sap,
1149                                       struct sk_buff *skb)
1150 {
1151         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1152
1153         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
1154
1155         ASSERT(self != NULL, return -1;);
1156         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1157         ASSERT(skb != NULL, return -1;);
1158
1159         if (!self->tty) {
1160                 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ );
1161                 return 0;
1162         }
1163
1164         /*
1165          * If we receive data when hardware is stopped then something is wrong.
1166          * We try to poll the peers line settings to check if we are up todate.
1167          * Devices like WinCE can do this, and since they don't send any
1168          * params, we can just as well declare the hardware for running.
1169          */
1170         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1171                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ );
1172                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1173
1174                 /* We can just as well declare the hardware for running */
1175                 ircomm_tty_send_initial_parameters(self);
1176                 ircomm_tty_link_established(self);
1177         }
1178
1179         /*
1180          * Just give it over to the line discipline. There is no need to
1181          * involve the flip buffers, since we are not running in an interrupt
1182          * handler
1183          */
1184         self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
1185
1186         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1187
1188         return 0;
1189 }
1190
1191 /*
1192  * Function ircomm_tty_control_indication (instance, sap, skb)
1193  *
1194  *    Parse all incoming parameters (easy!)
1195  *
1196  */
1197 static int ircomm_tty_control_indication(void *instance, void *sap,
1198                                          struct sk_buff *skb)
1199 {
1200         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1201         int clen;
1202
1203         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
1204
1205         ASSERT(self != NULL, return -1;);
1206         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1207         ASSERT(skb != NULL, return -1;);
1208
1209         clen = skb->data[0];
1210
1211         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1212                                &ircomm_param_info);
1213
1214         /* No need to kfree_skb - see ircomm_control_indication() */
1215
1216         return 0;
1217 }
1218
1219 /*
1220  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1221  *
1222  *    This function is called by IrTTP when it wants us to slow down the
1223  *    transmission of data. We just mark the hardware as stopped, and wait
1224  *    for IrTTP to notify us that things are OK again.
1225  */
1226 static void ircomm_tty_flow_indication(void *instance, void *sap,
1227                                        LOCAL_FLOW cmd)
1228 {
1229         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1230         struct tty_struct *tty;
1231
1232         ASSERT(self != NULL, return;);
1233         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1234
1235         tty = self->tty;
1236
1237         switch (cmd) {
1238         case FLOW_START:
1239                 IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ );
1240                 tty->hw_stopped = 0;
1241
1242                 /* ircomm_tty_do_softint will take care of the rest */
1243                 schedule_work(&self->tqueue);
1244                 break;
1245         default:  /* If we get here, something is very wrong, better stop */
1246         case FLOW_STOP:
1247                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ );
1248                 tty->hw_stopped = 1;
1249                 break;
1250         }
1251         self->flow = cmd;
1252 }
1253
1254 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1255 {
1256         int  ret=0;
1257
1258         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1259
1260         ret += sprintf(buf+ret, "Service type: ");
1261         if (self->service_type & IRCOMM_9_WIRE)
1262                 ret += sprintf(buf+ret, "9_WIRE");
1263         else if (self->service_type & IRCOMM_3_WIRE)
1264                 ret += sprintf(buf+ret, "3_WIRE");
1265         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1266                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1267         else
1268                 ret += sprintf(buf+ret, "No common service type!\n");
1269         ret += sprintf(buf+ret, "\n");
1270
1271         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1272
1273         ret += sprintf(buf+ret, "DTE status: ");
1274         if (self->settings.dte & IRCOMM_RTS)
1275                 ret += sprintf(buf+ret, "RTS|");
1276         if (self->settings.dte & IRCOMM_DTR)
1277                 ret += sprintf(buf+ret, "DTR|");
1278         if (self->settings.dte)
1279                 ret--; /* remove the last | */
1280         ret += sprintf(buf+ret, "\n");
1281
1282         ret += sprintf(buf+ret, "DCE status: ");
1283         if (self->settings.dce & IRCOMM_CTS)
1284                 ret += sprintf(buf+ret, "CTS|");
1285         if (self->settings.dce & IRCOMM_DSR)
1286                 ret += sprintf(buf+ret, "DSR|");
1287         if (self->settings.dce & IRCOMM_CD)
1288                 ret += sprintf(buf+ret, "CD|");
1289         if (self->settings.dce & IRCOMM_RI)
1290                 ret += sprintf(buf+ret, "RI|");
1291         if (self->settings.dce)
1292                 ret--; /* remove the last | */
1293         ret += sprintf(buf+ret, "\n");
1294
1295         ret += sprintf(buf+ret, "Configuration: ");
1296         if (!self->settings.null_modem)
1297                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1298         else
1299                 ret += sprintf(buf+ret,
1300                                "DTE <-> DTE (null modem emulation)\n");
1301
1302         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1303
1304         ret += sprintf(buf+ret, "Flow control: ");
1305         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1306                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1307         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1308                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1309         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1310                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1311         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1312                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1313         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1314                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1315         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1316                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1317         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1318                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1319         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1320                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1321         if (self->settings.flow_control)
1322                 ret--; /* remove the last | */
1323         ret += sprintf(buf+ret, "\n");
1324
1325         ret += sprintf(buf+ret, "Flags: ");
1326         if (self->flags & ASYNC_CTS_FLOW)
1327                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1328         if (self->flags & ASYNC_CHECK_CD)
1329                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1330         if (self->flags & ASYNC_INITIALIZED)
1331                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1332         if (self->flags & ASYNC_LOW_LATENCY)
1333                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1334         if (self->flags & ASYNC_CLOSING)
1335                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1336         if (self->flags & ASYNC_NORMAL_ACTIVE)
1337                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1338         if (self->flags)
1339                 ret--; /* remove the last | */
1340         ret += sprintf(buf+ret, "\n");
1341
1342         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1343                        "client" : "server");
1344         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1345         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1346         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1347
1348         if (self->tty)
1349                 ret += sprintf(buf+ret, "Hardware: %s\n",
1350                                self->tty->hw_stopped ? "Stopped" : "Running");
1351
1352         ret += sprintf(buf+ret, "\n");
1353         return ret;
1354 }
1355
1356
1357 /*
1358  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1359  *
1360  *
1361  *
1362  */
1363 #ifdef CONFIG_PROC_FS
1364 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1365                                 int *eof, void *unused)
1366 {
1367         struct ircomm_tty_cb *self;
1368         int count = 0, l;
1369         off_t begin = 0;
1370         unsigned long flags;
1371
1372         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1373
1374         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1375         while ((self != NULL) && (count < 4000)) {
1376                 if (self->magic != IRCOMM_TTY_MAGIC)
1377                         break;
1378
1379                 l = ircomm_tty_line_info(self, buf + count);
1380                 count += l;
1381                 if (count+begin > offset+len)
1382                         goto done;
1383                 if (count+begin < offset) {
1384                         begin += count;
1385                         count = 0;
1386                 }
1387
1388                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1389         }
1390         *eof = 1;
1391 done:
1392         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1393
1394         if (offset >= count+begin)
1395                 return 0;
1396         *start = buf + (offset-begin);
1397         return ((len < begin+count-offset) ? len : begin+count-offset);
1398 }
1399 #endif /* CONFIG_PROC_FS */
1400
1401 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1402 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1403 MODULE_LICENSE("GPL");
1404 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1405
1406 module_init(ircomm_tty_init);
1407 module_exit(ircomm_tty_cleanup);