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                 IRDA_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                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 138                            __FUNCTION__);
 139                 put_tty_driver(driver);
 140                 return -1;
 141         }
 142         return 0;
 143 }
 144
 145 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 146 {
 147         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 148
 149         IRDA_ASSERT(self != NULL, return;);
 150         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 151
 152         ircomm_tty_shutdown(self);
 153
 154         self->magic = 0;
 155         kfree(self);
 156 }
 157
 158 /*
 159  * Function ircomm_tty_cleanup ()
 160  *
 161  *    Remove IrCOMM TTY layer/driver
 162  *
 163  */
 164 static void __exit ircomm_tty_cleanup(void)
 165 {
 166         int ret;
 167
 168         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 169
 170         ret = tty_unregister_driver(driver);
 171         if (ret) {
 172                 IRDA_ERROR("%s(), failed to unregister driver\n",
 173                            __FUNCTION__);
 174                 return;
 175         }
 176
 177         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 178         put_tty_driver(driver);
 179 }
 180
 181 /*
 182  * Function ircomm_startup (self)
 183  *
 184  *
 185  *
 186  */
 187 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 188 {
 189         notify_t notify;
 190         int ret = -ENODEV;
 191
 192         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 193
 194         IRDA_ASSERT(self != NULL, return -1;);
 195         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 196
 197         /* Check if already open */
 198         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 199                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ );
 200                 return 0;
 201         }
 202
 203         /* Register with IrCOMM */
 204         irda_notify_init(&notify);
 205         /* These callbacks we must handle ourselves */
 206         notify.data_indication       = ircomm_tty_data_indication;
 207         notify.udata_indication      = ircomm_tty_control_indication;
 208         notify.flow_indication       = ircomm_tty_flow_indication;
 209
 210         /* Use the ircomm_tty interface for these ones */
 211         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 212         notify.connect_confirm       = ircomm_tty_connect_confirm;
 213         notify.connect_indication    = ircomm_tty_connect_indication;
 214         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 215         notify.instance = self;
 216
 217         if (!self->ircomm) {
 218                 self->ircomm = ircomm_open(&notify, self->service_type,
 219                                            self->line);
 220         }
 221         if (!self->ircomm)
 222                 goto err;
 223
 224         self->slsap_sel = self->ircomm->slsap_sel;
 225
 226         /* Connect IrCOMM link with remote device */
 227         ret = ircomm_tty_attach_cable(self);
 228         if (ret < 0) {
 229                 IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__);
 230                 goto err;
 231         }
 232
 233         return 0;
 234 err:
 235         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
 236         return ret;
 237 }
 238
 239 /*
 240  * Function ircomm_block_til_ready (self, filp)
 241  *
 242  *
 243  *
 244  */
 245 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 246                                       struct file *filp)
 247 {
 248         DECLARE_WAITQUEUE(wait, current);
 249         int             retval;
 250         int             do_clocal = 0, extra_count = 0;
 251         unsigned long   flags;
 252         struct tty_struct *tty;
 253
 254         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 255
 256         tty = self->tty;
 257
 258         /*
 259          * If non-blocking mode is set, or the port is not enabled,
 260          * then make the check up front and then exit.
 261          */
 262         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 263                 /* nonblock mode is set or port is not enabled */
 264                 self->flags |= ASYNC_NORMAL_ACTIVE;
 265                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ );
 266                 return 0;
 267         }
 268
 269         if (tty->termios->c_cflag & CLOCAL) {
 270                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ );
 271                 do_clocal = 1;
 272         }
 273
 274         /* Wait for carrier detect and the line to become
 275          * free (i.e., not in use by the callout).  While we are in
 276          * this loop, self->open_count is dropped by one, so that
 277          * mgsl_close() knows when to free things.  We restore it upon
 278          * exit, either normal or abnormal.
 279          */
 280
 281         retval = 0;
 282         add_wait_queue(&self->open_wait, &wait);
 283
 284         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 285               __FILE__,__LINE__, tty->driver->name, self->open_count );
 286
 287         /* As far as I can see, we protect open_count - Jean II */
 288         spin_lock_irqsave(&self->spinlock, flags);
 289         if (!tty_hung_up_p(filp)) {
 290                 extra_count = 1;
 291                 self->open_count--;
 292         }
 293         spin_unlock_irqrestore(&self->spinlock, flags);
 294         self->blocked_open++;
 295
 296         while (1) {
 297                 if (tty->termios->c_cflag & CBAUD) {
 298                         /* Here, we use to lock those two guys, but
 299                          * as ircomm_param_request() does it itself,
 300                          * I don't see the point (and I see the deadlock).
 301                          * Jean II */
 302                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 303
 304                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 305                 }
 306
 307                 current->state = TASK_INTERRUPTIBLE;
 308
 309                 if (tty_hung_up_p(filp) ||
 310                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 311                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 312                                         -EAGAIN : -ERESTARTSYS;
 313                         break;
 314                 }
 315
 316                 /*
 317                  * Check if link is ready now. Even if CLOCAL is
 318                  * specified, we cannot return before the IrCOMM link is
 319                  * ready
 320                  */
 321                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
 322                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 323                     self->state == IRCOMM_TTY_READY)
 324                 {
 325                         break;
 326                 }
 327
 328                 if (signal_pending(current)) {
 329                         retval = -ERESTARTSYS;
 330                         break;
 331                 }
 332
 333                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 334                       __FILE__,__LINE__, tty->driver->name, self->open_count );
 335
 336                 schedule();
 337         }
 338
 339         __set_current_state(TASK_RUNNING);
 340         remove_wait_queue(&self->open_wait, &wait);
 341
 342         if (extra_count) {
 343                 /* ++ is not atomic, so this should be protected - Jean II */
 344                 spin_lock_irqsave(&self->spinlock, flags);
 345                 self->open_count++;
 346                 spin_unlock_irqrestore(&self->spinlock, flags);
 347         }
 348         self->blocked_open--;
 349
 350         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 351               __FILE__,__LINE__, tty->driver->name, self->open_count);
 352
 353         if (!retval)
 354                 self->flags |= ASYNC_NORMAL_ACTIVE;
 355
 356         return retval;
 357 }
 358
 359 /*
 360  * Function ircomm_tty_open (tty, filp)
 361  *
 362  *    This routine is called when a particular tty device is opened. This
 363  *    routine is mandatory; if this routine is not filled in, the attempted
 364  *    open will fail with ENODEV.
 365  */
 366 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 367 {
 368         struct ircomm_tty_cb *self;
 369         unsigned int line;
 370         unsigned long   flags;
 371         int ret;
 372
 373         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 374
 375         line = tty->index;
 376         if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
 377                 return -ENODEV;
 378         }
 379
 380         /* Check if instance already exists */
 381         self = hashbin_lock_find(ircomm_tty, line, NULL);
 382         if (!self) {
 383                 /* No, so make new instance */
 384                 self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 385                 if (self == NULL) {
 386                         IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__);
 387                         return -ENOMEM;
 388                 }
 389                 memset(self, 0, sizeof(struct ircomm_tty_cb));
 390
 391                 self->magic = IRCOMM_TTY_MAGIC;
 392                 self->flow = FLOW_STOP;
 393
 394                 self->line = line;
 395                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint, self);
 396                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 397                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 398                 self->close_delay = 5*HZ/10;
 399                 self->closing_wait = 30*HZ;
 400
 401                 /* Init some important stuff */
 402                 init_timer(&self->watchdog_timer);
 403                 init_waitqueue_head(&self->open_wait);
 404                 init_waitqueue_head(&self->close_wait);
 405                 spin_lock_init(&self->spinlock);
 406
 407                 /*
 408                  * Force TTY into raw mode by default which is usually what
 409                  * we want for IrCOMM and IrLPT. This way applications will
 410                  * not have to twiddle with printcap etc.
 411                  */
 412                 tty->termios->c_iflag = 0;
 413                 tty->termios->c_oflag = 0;
 414
 415                 /* Insert into hash */
 416                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 417         }
 418         /* ++ is not atomic, so this should be protected - Jean II */
 419         spin_lock_irqsave(&self->spinlock, flags);
 420         self->open_count++;
 421
 422         tty->driver_data = self;
 423         self->tty = tty;
 424         spin_unlock_irqrestore(&self->spinlock, flags);
 425
 426         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name,
 427                    self->line, self->open_count);
 428
 429         /* Not really used by us, but lets do it anyway */
 430         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 431
 432         /*
 433          * If the port is the middle of closing, bail out now
 434          */
 435         if (tty_hung_up_p(filp) ||
 436             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 437
 438                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 439                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 440                  * IMHO it's either not needed in the first place
 441                  * or for some reason we need to make sure the async
 442                  * closing has been finished - if so, wouldn't we
 443                  * probably better sleep uninterruptible?
 444                  */
 445
 446                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 447                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 448                                      __FUNCTION__);
 449                         return -ERESTARTSYS;
 450                 }
 451
 452 #ifdef SERIAL_DO_RESTART
 453                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
 454                         -EAGAIN : -ERESTARTSYS);
 455 #else
 456                 return -EAGAIN;
 457 #endif
 458         }
 459
 460         /* Check if this is a "normal" ircomm device, or an irlpt device */
 461         if (line < 0x10) {
 462                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 463                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 464                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 465                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 466                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ );
 467         } else {
 468                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ );
 469                 self->service_type = IRCOMM_3_WIRE_RAW;
 470                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 471         }
 472
 473         ret = ircomm_tty_startup(self);
 474         if (ret)
 475                 return ret;
 476
 477         ret = ircomm_tty_block_til_ready(self, filp);
 478         if (ret) {
 479                 IRDA_DEBUG(2,
 480                       "%s(), returning after block_til_ready with %d\n", __FUNCTION__ ,
 481                       ret);
 482
 483                 return ret;
 484         }
 485         return 0;
 486 }
 487
 488 /*
 489  * Function ircomm_tty_close (tty, filp)
 490  *
 491  *    This routine is called when a particular tty device is closed.
 492  *
 493  */
 494 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 495 {
 496         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 497         unsigned long flags;
 498
 499         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 500
 501         if (!tty)
 502                 return;
 503
 504         IRDA_ASSERT(self != NULL, return;);
 505         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 506
 507         spin_lock_irqsave(&self->spinlock, flags);
 508
 509         if (tty_hung_up_p(filp)) {
 510                 spin_unlock_irqrestore(&self->spinlock, flags);
 511
 512                 IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ );
 513                 return;
 514         }
 515
 516         if ((tty->count == 1) && (self->open_count != 1)) {
 517                 /*
 518                  * Uh, oh.  tty->count is 1, which means that the tty
 519                  * structure will be freed.  state->count should always
 520                  * be one in these conditions.  If it's greater than
 521                  * one, we've got real problems, since it means the
 522                  * serial port won't be shutdown.
 523                  */
 524                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 525                            "tty->count is 1, state->count is %d\n", __FUNCTION__ ,
 526                            self->open_count);
 527                 self->open_count = 1;
 528         }
 529
 530         if (--self->open_count < 0) {
 531                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 532                            __FUNCTION__, self->line, self->open_count);
 533                 self->open_count = 0;
 534         }
 535         if (self->open_count) {
 536                 spin_unlock_irqrestore(&self->spinlock, flags);
 537
 538                 IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ );
 539                 return;
 540         }
 541
 542         /* Hum... Should be test_and_set_bit ??? - Jean II */
 543         set_bit(ASYNC_B_CLOSING, &self->flags);
 544
 545         /* We need to unlock here (we were unlocking at the end of this
 546          * function), because tty_wait_until_sent() may schedule.
 547          * I don't know if the rest should be protected somehow,
 548          * so someone should check. - Jean II */
 549         spin_unlock_irqrestore(&self->spinlock, flags);
 550
 551         /*
 552          * Now we wait for the transmit buffer to clear; and we notify
 553          * the line discipline to only process XON/XOFF characters.
 554          */
 555         tty->closing = 1;
 556         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 557                 tty_wait_until_sent(tty, self->closing_wait);
 558
 559         ircomm_tty_shutdown(self);
 560
 561         if (tty->driver->flush_buffer)
 562                 tty->driver->flush_buffer(tty);
 563         if (tty->ldisc.flush_buffer)
 564                 tty->ldisc.flush_buffer(tty);
 565
 566         tty->closing = 0;
 567         self->tty = NULL;
 568
 569         if (self->blocked_open) {
 570                 if (self->close_delay) {
 571                         current->state = TASK_INTERRUPTIBLE;
 572                         schedule_timeout(self->close_delay);
 573                 }
 574                 wake_up_interruptible(&self->open_wait);
 575         }
 576
 577         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 578         wake_up_interruptible(&self->close_wait);
 579 }
 580
 581 /*
 582  * Function ircomm_tty_flush_buffer (tty)
 583  *
 584  *
 585  *
 586  */
 587 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 588 {
 589         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 590
 591         IRDA_ASSERT(self != NULL, return;);
 592         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 593
 594         /*
 595          * Let do_softint() do this to avoid race condition with
 596          * do_softint() ;-)
 597          */
 598         schedule_work(&self->tqueue);
 599 }
 600
 601 /*
 602  * Function ircomm_tty_do_softint (private_)
 603  *
 604  *    We use this routine to give the write wakeup to the user at at a
 605  *    safe time (as fast as possible after write have completed). This
 606  *    can be compared to the Tx interrupt.
 607  */
 608 static void ircomm_tty_do_softint(void *private_)
 609 {
 610         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
 611         struct tty_struct *tty;
 612         unsigned long flags;
 613         struct sk_buff *skb, *ctrl_skb;
 614
 615         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 616
 617         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 618                 return;
 619
 620         tty = self->tty;
 621         if (!tty)
 622                 return;
 623
 624         /* Unlink control buffer */
 625         spin_lock_irqsave(&self->spinlock, flags);
 626
 627         ctrl_skb = self->ctrl_skb;
 628         self->ctrl_skb = NULL;
 629
 630         spin_unlock_irqrestore(&self->spinlock, flags);
 631
 632         /* Flush control buffer if any */
 633         if(ctrl_skb) {
 634                 if(self->flow == FLOW_START)
 635                         ircomm_control_request(self->ircomm, ctrl_skb);
 636                 /* Drop reference count - see ircomm_ttp_data_request(). */
 637                 dev_kfree_skb(ctrl_skb);
 638         }
 639
 640         if (tty->hw_stopped)
 641                 return;
 642
 643         /* Unlink transmit buffer */
 644         spin_lock_irqsave(&self->spinlock, flags);
 645
 646         skb = self->tx_skb;
 647         self->tx_skb = NULL;
 648
 649         spin_unlock_irqrestore(&self->spinlock, flags);
 650
 651         /* Flush transmit buffer if any */
 652         if (skb) {
 653                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 654                 /* Drop reference count - see ircomm_ttp_data_request(). */
 655                 dev_kfree_skb(skb);
 656         }
 657
 658         /* Check if user (still) wants to be waken up */
 659         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
 660             tty->ldisc.write_wakeup)
 661         {
 662                 (tty->ldisc.write_wakeup)(tty);
 663         }
 664         wake_up_interruptible(&tty->write_wait);
 665 }
 666
 667 /*
 668  * Function ircomm_tty_write (tty, buf, count)
 669  *
 670  *    This routine is called by the kernel to write a series of characters
 671  *    to the tty device. The characters may come from user space or kernel
 672  *    space. This routine will return the number of characters actually
 673  *    accepted for writing. This routine is mandatory.
 674  */
 675 static int ircomm_tty_write(struct tty_struct *tty,
 676                             const unsigned char *buf, int count)
 677 {
 678         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 679         unsigned long flags;
 680         struct sk_buff *skb;
 681         int tailroom = 0;
 682         int len = 0;
 683         int size;
 684
 685         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count,
 686                    tty->hw_stopped);
 687
 688         IRDA_ASSERT(self != NULL, return -1;);
 689         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 690
 691         /* We may receive packets from the TTY even before we have finished
 692          * our setup. Not cool.
 693          * The problem is that we don't know the final header and data size
 694          * to create the proper skb, so any skb we would create would have
 695          * bogus header and data size, so need care.
 696          * We use a bogus header size to safely detect this condition.
 697          * Another problem is that hw_stopped was set to 0 way before it
 698          * should be, so we would drop this skb. It should now be fixed.
 699          * One option is to not accept data until we are properly setup.
 700          * But, I suspect that when it happens, the ppp line discipline
 701          * just "drops" the data, which might screw up connect scripts.
 702          * The second option is to create a "safe skb", with large header
 703          * and small size (see ircomm_tty_open() for values).
 704          * We just need to make sure that when the real values get filled,
 705          * we don't mess up the original "safe skb" (see tx_data_size).
 706          * Jean II */
 707         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 708                 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
 709 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 710                 /* We didn't consume anything, TTY will retry */
 711                 return 0;
 712 #endif
 713         }
 714
 715         if (count < 1)
 716                 return 0;
 717
 718         /* Protect our manipulation of self->tx_skb and related */
 719         spin_lock_irqsave(&self->spinlock, flags);
 720
 721         /* Fetch current transmit buffer */
 722         skb = self->tx_skb;
 723
 724         /*
 725          * Send out all the data we get, possibly as multiple fragmented
 726          * frames, but this will only happen if the data is larger than the
 727          * max data size. The normal case however is just the opposite, and
 728          * this function may be called multiple times, and will then actually
 729          * defragment the data and send it out as one packet as soon as
 730          * possible, but at a safer point in time
 731          */
 732         while (count) {
 733                 size = count;
 734
 735                 /* Adjust data size to the max data size */
 736                 if (size > self->max_data_size)
 737                         size = self->max_data_size;
 738
 739                 /*
 740                  * Do we already have a buffer ready for transmit, or do
 741                  * we need to allocate a new frame
 742                  */
 743                 if (skb) {
 744                         /*
 745                          * Any room for more data at the end of the current
 746                          * transmit buffer? Cannot use skb_tailroom, since
 747                          * dev_alloc_skb gives us a larger skb than we
 748                          * requested
 749                          * Note : use tx_data_size, because max_data_size
 750                          * may have changed and we don't want to overwrite
 751                          * the skb. - Jean II
 752                          */
 753                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 754                                 /* Adjust data to tailroom */
 755                                 if (size > tailroom)
 756                                         size = tailroom;
 757                         } else {
 758                                 /*
 759                                  * Current transmit frame is full, so break
 760                                  * out, so we can send it as soon as possible
 761                                  */
 762                                 break;
 763                         }
 764                 } else {
 765                         /* Prepare a full sized frame */
 766                         skb = dev_alloc_skb(self->max_data_size+
 767                                             self->max_header_size);
 768                         if (!skb) {
 769                                 spin_unlock_irqrestore(&self->spinlock, flags);
 770                                 return -ENOBUFS;
 771                         }
 772                         skb_reserve(skb, self->max_header_size);
 773                         self->tx_skb = skb;
 774                         /* Remember skb size because max_data_size may
 775                          * change later on - Jean II */
 776                         self->tx_data_size = self->max_data_size;
 777                 }
 778
 779                 /* Copy data */
 780                 memcpy(skb_put(skb,size), buf + len, size);
 781
 782                 count -= size;
 783                 len += size;
 784         }
 785
 786         spin_unlock_irqrestore(&self->spinlock, flags);
 787
 788         /*
 789          * Schedule a new thread which will transmit the frame as soon
 790          * as possible, but at a safe point in time. We do this so the
 791          * "user" can give us data multiple times, as PPP does (because of
 792          * its 256 byte tx buffer). We will then defragment and send out
 793          * all this data as one single packet.
 794          */
 795         schedule_work(&self->tqueue);
 796
 797         return len;
 798 }
 799
 800 /*
 801  * Function ircomm_tty_write_room (tty)
 802  *
 803  *    This routine returns the numbers of characters the tty driver will
 804  *    accept for queuing to be written. This number is subject to change as
 805  *    output buffers get emptied, or if the output flow control is acted.
 806  */
 807 static int ircomm_tty_write_room(struct tty_struct *tty)
 808 {
 809         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 810         unsigned long flags;
 811         int ret;
 812
 813         IRDA_ASSERT(self != NULL, return -1;);
 814         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 815
 816 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 817         /* max_header_size tells us if the channel is initialised or not. */
 818         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 819                 /* Don't bother us yet */
 820                 return 0;
 821 #endif
 822
 823         /* Check if we are allowed to transmit any data.
 824          * hw_stopped is the regular flow control.
 825          * Jean II */
 826         if (tty->hw_stopped)
 827                 ret = 0;
 828         else {
 829                 spin_lock_irqsave(&self->spinlock, flags);
 830                 if (self->tx_skb)
 831                         ret = self->tx_data_size - self->tx_skb->len;
 832                 else
 833                         ret = self->max_data_size;
 834                 spin_unlock_irqrestore(&self->spinlock, flags);
 835         }
 836         IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret);
 837
 838         return ret;
 839 }
 840
 841 /*
 842  * Function ircomm_tty_wait_until_sent (tty, timeout)
 843  *
 844  *    This routine waits until the device has written out all of the
 845  *    characters in its transmitter FIFO.
 846  */
 847 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 848 {
 849         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 850         unsigned long orig_jiffies, poll_time;
 851         unsigned long flags;
 852
 853         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 854
 855         IRDA_ASSERT(self != NULL, return;);
 856         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 857
 858         orig_jiffies = jiffies;
 859
 860         /* Set poll time to 200 ms */
 861         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 862
 863         spin_lock_irqsave(&self->spinlock, flags);
 864         while (self->tx_skb && self->tx_skb->len) {
 865                 spin_unlock_irqrestore(&self->spinlock, flags);
 866                 current->state = TASK_INTERRUPTIBLE;
 867                 schedule_timeout(poll_time);
 868                 spin_lock_irqsave(&self->spinlock, flags);
 869                 if (signal_pending(current))
 870                         break;
 871                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 872                         break;
 873         }
 874         spin_unlock_irqrestore(&self->spinlock, flags);
 875         current->state = TASK_RUNNING;
 876 }
 877
 878 /*
 879  * Function ircomm_tty_throttle (tty)
 880  *
 881  *    This routine notifies the tty driver that input buffers for the line
 882  *    discipline are close to full, and it should somehow signal that no
 883  *    more characters should be sent to the tty.
 884  */
 885 static void ircomm_tty_throttle(struct tty_struct *tty)
 886 {
 887         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 888
 889         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 890
 891         IRDA_ASSERT(self != NULL, return;);
 892         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 893
 894         /* Software flow control? */
 895         if (I_IXOFF(tty))
 896                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 897
 898         /* Hardware flow control? */
 899         if (tty->termios->c_cflag & CRTSCTS) {
 900                 self->settings.dte &= ~IRCOMM_RTS;
 901                 self->settings.dte |= IRCOMM_DELTA_RTS;
 902
 903                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 904         }
 905
 906         ircomm_flow_request(self->ircomm, FLOW_STOP);
 907 }
 908
 909 /*
 910  * Function ircomm_tty_unthrottle (tty)
 911  *
 912  *    This routine notifies the tty drivers that it should signals that
 913  *    characters can now be sent to the tty without fear of overrunning the
 914  *    input buffers of the line disciplines.
 915  */
 916 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 917 {
 918         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 919
 920         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 921
 922         IRDA_ASSERT(self != NULL, return;);
 923         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 924
 925         /* Using software flow control? */
 926         if (I_IXOFF(tty)) {
 927                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 928         }
 929
 930         /* Using hardware flow control? */
 931         if (tty->termios->c_cflag & CRTSCTS) {
 932                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 933
 934                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 935                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ );
 936         }
 937         ircomm_flow_request(self->ircomm, FLOW_START);
 938 }
 939
 940 /*
 941  * Function ircomm_tty_chars_in_buffer (tty)
 942  *
 943  *    Indicates if there are any data in the buffer
 944  *
 945  */
 946 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 947 {
 948         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 949         unsigned long flags;
 950         int len = 0;
 951
 952         IRDA_ASSERT(self != NULL, return -1;);
 953         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 954
 955         spin_lock_irqsave(&self->spinlock, flags);
 956
 957         if (self->tx_skb)
 958                 len = self->tx_skb->len;
 959
 960         spin_unlock_irqrestore(&self->spinlock, flags);
 961
 962         return len;
 963 }
 964
 965 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 966 {
 967         unsigned long flags;
 968
 969         IRDA_ASSERT(self != NULL, return;);
 970         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 971
 972         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 973
 974         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 975                 return;
 976
 977         ircomm_tty_detach_cable(self);
 978
 979         spin_lock_irqsave(&self->spinlock, flags);
 980
 981         del_timer(&self->watchdog_timer);
 982
 983         /* Free parameter buffer */
 984         if (self->ctrl_skb) {
 985                 dev_kfree_skb(self->ctrl_skb);
 986                 self->ctrl_skb = NULL;
 987         }
 988
 989         /* Free transmit buffer */
 990         if (self->tx_skb) {
 991                 dev_kfree_skb(self->tx_skb);
 992                 self->tx_skb = NULL;
 993         }
 994
 995         if (self->ircomm) {
 996                 ircomm_close(self->ircomm);
 997                 self->ircomm = NULL;
 998         }
 999
1000         spin_unlock_irqrestore(&self->spinlock, flags);
1001 }
1002
1003 /*
1004  * Function ircomm_tty_hangup (tty)
1005  *
1006  *    This routine notifies the tty driver that it should hangup the tty
1007  *    device.
1008  *
1009  */
1010 static void ircomm_tty_hangup(struct tty_struct *tty)
1011 {
1012         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1013         unsigned long   flags;
1014
1015         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1016
1017         IRDA_ASSERT(self != NULL, return;);
1018         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1019
1020         if (!tty)
1021                 return;
1022
1023         /* ircomm_tty_flush_buffer(tty); */
1024         ircomm_tty_shutdown(self);
1025
1026         /* I guess we need to lock here - Jean II */
1027         spin_lock_irqsave(&self->spinlock, flags);
1028         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1029         self->tty = NULL;
1030         self->open_count = 0;
1031         spin_unlock_irqrestore(&self->spinlock, flags);
1032
1033         wake_up_interruptible(&self->open_wait);
1034 }
1035
1036 /*
1037  * Function ircomm_tty_send_xchar (tty, ch)
1038  *
1039  *    This routine is used to send a high-priority XON/XOFF character to
1040  *    the device.
1041  */
1042 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1043 {
1044         IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ );
1045 }
1046
1047 /*
1048  * Function ircomm_tty_start (tty)
1049  *
1050  *    This routine notifies the tty driver that it resume sending
1051  *    characters to the tty device.
1052  */
1053 void ircomm_tty_start(struct tty_struct *tty)
1054 {
1055         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1056
1057         ircomm_flow_request(self->ircomm, FLOW_START);
1058 }
1059
1060 /*
1061  * Function ircomm_tty_stop (tty)
1062  *
1063  *     This routine notifies the tty driver that it should stop outputting
1064  *     characters to the tty device.
1065  */
1066 static void ircomm_tty_stop(struct tty_struct *tty)
1067 {
1068         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1069
1070         IRDA_ASSERT(self != NULL, return;);
1071         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1072
1073         ircomm_flow_request(self->ircomm, FLOW_STOP);
1074 }
1075
1076 /*
1077  * Function ircomm_check_modem_status (self)
1078  *
1079  *    Check for any changes in the DCE's line settings. This function should
1080  *    be called whenever the dce parameter settings changes, to update the
1081  *    flow control settings and other things
1082  */
1083 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1084 {
1085         struct tty_struct *tty;
1086         int status;
1087
1088         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
1089
1090         IRDA_ASSERT(self != NULL, return;);
1091         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1092
1093         tty = self->tty;
1094
1095         status = self->settings.dce;
1096
1097         if (status & IRCOMM_DCE_DELTA_ANY) {
1098                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1099         }
1100         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1101                 IRDA_DEBUG(2,
1102                            "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line,
1103                            (status & IRCOMM_CD) ? "on" : "off");
1104
1105                 if (status & IRCOMM_CD) {
1106                         wake_up_interruptible(&self->open_wait);
1107                 } else {
1108                         IRDA_DEBUG(2,
1109                                    "%s(), Doing serial hangup..\n", __FUNCTION__ );
1110                         if (tty)
1111                                 tty_hangup(tty);
1112
1113                         /* Hangup will remote the tty, so better break out */
1114                         return;
1115                 }
1116         }
1117         if (self->flags & ASYNC_CTS_FLOW) {
1118                 if (tty->hw_stopped) {
1119                         if (status & IRCOMM_CTS) {
1120                                 IRDA_DEBUG(2,
1121                                            "%s(), CTS tx start...\n", __FUNCTION__ );
1122                                 tty->hw_stopped = 0;
1123
1124                                 /* Wake up processes blocked on open */
1125                                 wake_up_interruptible(&self->open_wait);
1126
1127                                 schedule_work(&self->tqueue);
1128                                 return;
1129                         }
1130                 } else {
1131                         if (!(status & IRCOMM_CTS)) {
1132                                 IRDA_DEBUG(2,
1133                                            "%s(), CTS tx stop...\n", __FUNCTION__ );
1134                                 tty->hw_stopped = 1;
1135                         }
1136                 }
1137         }
1138 }
1139
1140 /*
1141  * Function ircomm_tty_data_indication (instance, sap, skb)
1142  *
1143  *    Handle incoming data, and deliver it to the line discipline
1144  *
1145  */
1146 static int ircomm_tty_data_indication(void *instance, void *sap,
1147                                       struct sk_buff *skb)
1148 {
1149         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1150
1151         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
1152
1153         IRDA_ASSERT(self != NULL, return -1;);
1154         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1155         IRDA_ASSERT(skb != NULL, return -1;);
1156
1157         if (!self->tty) {
1158                 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ );
1159                 return 0;
1160         }
1161
1162         /*
1163          * If we receive data when hardware is stopped then something is wrong.
1164          * We try to poll the peers line settings to check if we are up todate.
1165          * Devices like WinCE can do this, and since they don't send any
1166          * params, we can just as well declare the hardware for running.
1167          */
1168         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1169                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ );
1170                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1171
1172                 /* We can just as well declare the hardware for running */
1173                 ircomm_tty_send_initial_parameters(self);
1174                 ircomm_tty_link_established(self);
1175         }
1176
1177         /*
1178          * Just give it over to the line discipline. There is no need to
1179          * involve the flip buffers, since we are not running in an interrupt
1180          * handler
1181          */
1182         self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
1183
1184         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1185
1186         return 0;
1187 }
1188
1189 /*
1190  * Function ircomm_tty_control_indication (instance, sap, skb)
1191  *
1192  *    Parse all incoming parameters (easy!)
1193  *
1194  */
1195 static int ircomm_tty_control_indication(void *instance, void *sap,
1196                                          struct sk_buff *skb)
1197 {
1198         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1199         int clen;
1200
1201         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
1202
1203         IRDA_ASSERT(self != NULL, return -1;);
1204         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1205         IRDA_ASSERT(skb != NULL, return -1;);
1206
1207         clen = skb->data[0];
1208
1209         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1210                                &ircomm_param_info);
1211
1212         /* No need to kfree_skb - see ircomm_control_indication() */
1213
1214         return 0;
1215 }
1216
1217 /*
1218  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1219  *
1220  *    This function is called by IrTTP when it wants us to slow down the
1221  *    transmission of data. We just mark the hardware as stopped, and wait
1222  *    for IrTTP to notify us that things are OK again.
1223  */
1224 static void ircomm_tty_flow_indication(void *instance, void *sap,
1225                                        LOCAL_FLOW cmd)
1226 {
1227         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1228         struct tty_struct *tty;
1229
1230         IRDA_ASSERT(self != NULL, return;);
1231         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1232
1233         tty = self->tty;
1234
1235         switch (cmd) {
1236         case FLOW_START:
1237                 IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ );
1238                 tty->hw_stopped = 0;
1239
1240                 /* ircomm_tty_do_softint will take care of the rest */
1241                 schedule_work(&self->tqueue);
1242                 break;
1243         default:  /* If we get here, something is very wrong, better stop */
1244         case FLOW_STOP:
1245                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ );
1246                 tty->hw_stopped = 1;
1247                 break;
1248         }
1249         self->flow = cmd;
1250 }
1251
1252 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1253 {
1254         int  ret=0;
1255
1256         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1257
1258         ret += sprintf(buf+ret, "Service type: ");
1259         if (self->service_type & IRCOMM_9_WIRE)
1260                 ret += sprintf(buf+ret, "9_WIRE");
1261         else if (self->service_type & IRCOMM_3_WIRE)
1262                 ret += sprintf(buf+ret, "3_WIRE");
1263         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1264                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1265         else
1266                 ret += sprintf(buf+ret, "No common service type!\n");
1267         ret += sprintf(buf+ret, "\n");
1268
1269         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1270
1271         ret += sprintf(buf+ret, "DTE status: ");
1272         if (self->settings.dte & IRCOMM_RTS)
1273                 ret += sprintf(buf+ret, "RTS|");
1274         if (self->settings.dte & IRCOMM_DTR)
1275                 ret += sprintf(buf+ret, "DTR|");
1276         if (self->settings.dte)
1277                 ret--; /* remove the last | */
1278         ret += sprintf(buf+ret, "\n");
1279
1280         ret += sprintf(buf+ret, "DCE status: ");
1281         if (self->settings.dce & IRCOMM_CTS)
1282                 ret += sprintf(buf+ret, "CTS|");
1283         if (self->settings.dce & IRCOMM_DSR)
1284                 ret += sprintf(buf+ret, "DSR|");
1285         if (self->settings.dce & IRCOMM_CD)
1286                 ret += sprintf(buf+ret, "CD|");
1287         if (self->settings.dce & IRCOMM_RI)
1288                 ret += sprintf(buf+ret, "RI|");
1289         if (self->settings.dce)
1290                 ret--; /* remove the last | */
1291         ret += sprintf(buf+ret, "\n");
1292
1293         ret += sprintf(buf+ret, "Configuration: ");
1294         if (!self->settings.null_modem)
1295                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1296         else
1297                 ret += sprintf(buf+ret,
1298                                "DTE <-> DTE (null modem emulation)\n");
1299
1300         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1301
1302         ret += sprintf(buf+ret, "Flow control: ");
1303         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1304                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1305         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1306                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1307         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1308                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1309         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1310                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1311         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1312                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1313         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1314                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1315         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1316                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1317         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1318                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1319         if (self->settings.flow_control)
1320                 ret--; /* remove the last | */
1321         ret += sprintf(buf+ret, "\n");
1322
1323         ret += sprintf(buf+ret, "Flags: ");
1324         if (self->flags & ASYNC_CTS_FLOW)
1325                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1326         if (self->flags & ASYNC_CHECK_CD)
1327                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1328         if (self->flags & ASYNC_INITIALIZED)
1329                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1330         if (self->flags & ASYNC_LOW_LATENCY)
1331                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1332         if (self->flags & ASYNC_CLOSING)
1333                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1334         if (self->flags & ASYNC_NORMAL_ACTIVE)
1335                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1336         if (self->flags)
1337                 ret--; /* remove the last | */
1338         ret += sprintf(buf+ret, "\n");
1339
1340         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1341                        "client" : "server");
1342         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1343         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1344         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1345
1346         if (self->tty)
1347                 ret += sprintf(buf+ret, "Hardware: %s\n",
1348                                self->tty->hw_stopped ? "Stopped" : "Running");
1349
1350         ret += sprintf(buf+ret, "\n");
1351         return ret;
1352 }
1353
1354
1355 /*
1356  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1357  *
1358  *
1359  *
1360  */
1361 #ifdef CONFIG_PROC_FS
1362 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1363                                 int *eof, void *unused)
1364 {
1365         struct ircomm_tty_cb *self;
1366         int count = 0, l;
1367         off_t begin = 0;
1368         unsigned long flags;
1369
1370         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1371
1372         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1373         while ((self != NULL) && (count < 4000)) {
1374                 if (self->magic != IRCOMM_TTY_MAGIC)
1375                         break;
1376
1377                 l = ircomm_tty_line_info(self, buf + count);
1378                 count += l;
1379                 if (count+begin > offset+len)
1380                         goto done;
1381                 if (count+begin < offset) {
1382                         begin += count;
1383                         count = 0;
1384                 }
1385
1386                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1387         }
1388         *eof = 1;
1389 done:
1390         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1391
1392         if (offset >= count+begin)
1393                 return 0;
1394         *start = buf + (offset-begin);
1395         return ((len < begin+count-offset) ? len : begin+count-offset);
1396 }
1397 #endif /* CONFIG_PROC_FS */
1398
1399 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1400 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1401 MODULE_LICENSE("GPL");
1402 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1403
1404 module_init(ircomm_tty_init);
1405 module_exit(ircomm_tty_cleanup);