net/irda/ircomm/ircomm_tty.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty.c
   4  * Version:       1.0
   5  * Description:   IrCOMM serial TTY driver
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 21:00:56 1999
   9  * Modified at:   Wed Feb 23 00:09:02 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c and previous IrCOMM work by Takahide Higuchi
  12  *
  13  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/sched.h>
  37 #include <linux/termios.h>
  38 #include <linux/tty.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  41
  42 #include <asm/uaccess.h>
  43
  44 #include <net/irda/irda.h>
  45 #include <net/irda/irmod.h>
  46
  47 #include <net/irda/ircomm_core.h>
  48 #include <net/irda/ircomm_param.h>
  49 #include <net/irda/ircomm_tty_attach.h>
  50 #include <net/irda/ircomm_tty.h>
  51
  52 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  53 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  54 static int  ircomm_tty_write(struct tty_struct * tty,
  55                              const unsigned char *buf, int count);
  56 static int  ircomm_tty_write_room(struct tty_struct *tty);
  57 static void ircomm_tty_throttle(struct tty_struct *tty);
  58 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  59 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  60 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  61 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  62 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  63 static void ircomm_tty_hangup(struct tty_struct *tty);
  64 static void ircomm_tty_do_softint(struct work_struct *work);
  65 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  66 static void ircomm_tty_stop(struct tty_struct *tty);
  67
  68 static int ircomm_tty_data_indication(void *instance, void *sap,
  69                                       struct sk_buff *skb);
  70 static int ircomm_tty_control_indication(void *instance, void *sap,
  71                                          struct sk_buff *skb);
  72 static void ircomm_tty_flow_indication(void *instance, void *sap,
  73                                        LOCAL_FLOW cmd);
  74 #ifdef CONFIG_PROC_FS
  75 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
  76                                 int *eof, void *unused);
  77 #endif /* CONFIG_PROC_FS */
  78 static struct tty_driver *driver;
  79
  80 static hashbin_t *ircomm_tty = NULL;
  81
  82 static const struct tty_operations ops = {
  83         .open            = ircomm_tty_open,
  84         .close           = ircomm_tty_close,
  85         .write           = ircomm_tty_write,
  86         .write_room      = ircomm_tty_write_room,
  87         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  88         .flush_buffer    = ircomm_tty_flush_buffer,
  89         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  90         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  91         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  92         .throttle        = ircomm_tty_throttle,
  93         .unthrottle      = ircomm_tty_unthrottle,
  94         .send_xchar      = ircomm_tty_send_xchar,
  95         .set_termios     = ircomm_tty_set_termios,
  96         .stop            = ircomm_tty_stop,
  97         .start           = ircomm_tty_start,
  98         .hangup          = ircomm_tty_hangup,
  99         .wait_until_sent = ircomm_tty_wait_until_sent,
 100 #ifdef CONFIG_PROC_FS
 101         .read_proc       = ircomm_tty_read_proc,
 102 #endif /* CONFIG_PROC_FS */
 103 };
 104
 105 /*
 106  * Function ircomm_tty_init()
 107  *
 108  *    Init IrCOMM TTY layer/driver
 109  *
 110  */
 111 static int __init ircomm_tty_init(void)
 112 {
 113         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 114         if (!driver)
 115                 return -ENOMEM;
 116         ircomm_tty = hashbin_new(HB_LOCK);
 117         if (ircomm_tty == NULL) {
 118                 IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
 119                 put_tty_driver(driver);
 120                 return -ENOMEM;
 121         }
 122
 123         driver->owner           = THIS_MODULE;
 124         driver->driver_name     = "ircomm";
 125         driver->name            = "ircomm";
 126         driver->major           = IRCOMM_TTY_MAJOR;
 127         driver->minor_start     = IRCOMM_TTY_MINOR;
 128         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 129         driver->subtype         = SERIAL_TYPE_NORMAL;
 130         driver->init_termios    = tty_std_termios;
 131         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 132         driver->flags           = TTY_DRIVER_REAL_RAW;
 133         tty_set_operations(driver, &ops);
 134         if (tty_register_driver(driver)) {
 135                 IRDA_ERROR("%s(): Couldn't register serial driver\n",
 136                            __func__);
 137                 put_tty_driver(driver);
 138                 return -1;
 139         }
 140         return 0;
 141 }
 142
 143 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 144 {
 145         IRDA_DEBUG(0, "%s()\n", __func__ );
 146
 147         IRDA_ASSERT(self != NULL, return;);
 148         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 149
 150         ircomm_tty_shutdown(self);
 151
 152         self->magic = 0;
 153         kfree(self);
 154 }
 155
 156 /*
 157  * Function ircomm_tty_cleanup ()
 158  *
 159  *    Remove IrCOMM TTY layer/driver
 160  *
 161  */
 162 static void __exit ircomm_tty_cleanup(void)
 163 {
 164         int ret;
 165
 166         IRDA_DEBUG(4, "%s()\n", __func__ );
 167
 168         ret = tty_unregister_driver(driver);
 169         if (ret) {
 170                 IRDA_ERROR("%s(), failed to unregister driver\n",
 171                            __func__);
 172                 return;
 173         }
 174
 175         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 176         put_tty_driver(driver);
 177 }
 178
 179 /*
 180  * Function ircomm_startup (self)
 181  *
 182  *
 183  *
 184  */
 185 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 186 {
 187         notify_t notify;
 188         int ret = -ENODEV;
 189
 190         IRDA_DEBUG(2, "%s()\n", __func__ );
 191
 192         IRDA_ASSERT(self != NULL, return -1;);
 193         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 194
 195         /* Check if already open */
 196         if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 197                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
 198                 return 0;
 199         }
 200
 201         /* Register with IrCOMM */
 202         irda_notify_init(&notify);
 203         /* These callbacks we must handle ourselves */
 204         notify.data_indication       = ircomm_tty_data_indication;
 205         notify.udata_indication      = ircomm_tty_control_indication;
 206         notify.flow_indication       = ircomm_tty_flow_indication;
 207
 208         /* Use the ircomm_tty interface for these ones */
 209         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 210         notify.connect_confirm       = ircomm_tty_connect_confirm;
 211         notify.connect_indication    = ircomm_tty_connect_indication;
 212         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 213         notify.instance = self;
 214
 215         if (!self->ircomm) {
 216                 self->ircomm = ircomm_open(&notify, self->service_type,
 217                                            self->line);
 218         }
 219         if (!self->ircomm)
 220                 goto err;
 221
 222         self->slsap_sel = self->ircomm->slsap_sel;
 223
 224         /* Connect IrCOMM link with remote device */
 225         ret = ircomm_tty_attach_cable(self);
 226         if (ret < 0) {
 227                 IRDA_ERROR("%s(), error attaching cable!\n", __func__);
 228                 goto err;
 229         }
 230
 231         return 0;
 232 err:
 233         clear_bit(ASYNC_B_INITIALIZED, &self->flags);
 234         return ret;
 235 }
 236
 237 /*
 238  * Function ircomm_block_til_ready (self, filp)
 239  *
 240  *
 241  *
 242  */
 243 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 244                                       struct file *filp)
 245 {
 246         DECLARE_WAITQUEUE(wait, current);
 247         int             retval;
 248         int             do_clocal = 0, extra_count = 0;
 249         unsigned long   flags;
 250         struct tty_struct *tty;
 251
 252         IRDA_DEBUG(2, "%s()\n", __func__ );
 253
 254         tty = self->tty;
 255
 256         /*
 257          * If non-blocking mode is set, or the port is not enabled,
 258          * then make the check up front and then exit.
 259          */
 260         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 261                 /* nonblock mode is set or port is not enabled */
 262                 self->flags |= ASYNC_NORMAL_ACTIVE;
 263                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
 264                 return 0;
 265         }
 266
 267         if (tty->termios->c_cflag & CLOCAL) {
 268                 IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
 269                 do_clocal = 1;
 270         }
 271
 272         /* Wait for carrier detect and the line to become
 273          * free (i.e., not in use by the callout).  While we are in
 274          * this loop, self->open_count is dropped by one, so that
 275          * mgsl_close() knows when to free things.  We restore it upon
 276          * exit, either normal or abnormal.
 277          */
 278
 279         retval = 0;
 280         add_wait_queue(&self->open_wait, &wait);
 281
 282         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 283               __FILE__,__LINE__, tty->driver->name, self->open_count );
 284
 285         /* As far as I can see, we protect open_count - Jean II */
 286         spin_lock_irqsave(&self->spinlock, flags);
 287         if (!tty_hung_up_p(filp)) {
 288                 extra_count = 1;
 289                 self->open_count--;
 290         }
 291         spin_unlock_irqrestore(&self->spinlock, flags);
 292         self->blocked_open++;
 293
 294         while (1) {
 295                 if (tty->termios->c_cflag & CBAUD) {
 296                         /* Here, we use to lock those two guys, but
 297                          * as ircomm_param_request() does it itself,
 298                          * I don't see the point (and I see the deadlock).
 299                          * Jean II */
 300                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 301
 302                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 303                 }
 304
 305                 current->state = TASK_INTERRUPTIBLE;
 306
 307                 if (tty_hung_up_p(filp) ||
 308                     !test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
 309                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 310                                         -EAGAIN : -ERESTARTSYS;
 311                         break;
 312                 }
 313
 314                 /*
 315                  * Check if link is ready now. Even if CLOCAL is
 316                  * specified, we cannot return before the IrCOMM link is
 317                  * ready
 318                  */
 319                 if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
 320                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 321                     self->state == IRCOMM_TTY_READY)
 322                 {
 323                         break;
 324                 }
 325
 326                 if (signal_pending(current)) {
 327                         retval = -ERESTARTSYS;
 328                         break;
 329                 }
 330
 331                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 332                       __FILE__,__LINE__, tty->driver->name, self->open_count );
 333
 334                 schedule();
 335         }
 336
 337         __set_current_state(TASK_RUNNING);
 338         remove_wait_queue(&self->open_wait, &wait);
 339
 340         if (extra_count) {
 341                 /* ++ is not atomic, so this should be protected - Jean II */
 342                 spin_lock_irqsave(&self->spinlock, flags);
 343                 self->open_count++;
 344                 spin_unlock_irqrestore(&self->spinlock, flags);
 345         }
 346         self->blocked_open--;
 347
 348         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 349               __FILE__,__LINE__, tty->driver->name, self->open_count);
 350
 351         if (!retval)
 352                 self->flags |= ASYNC_NORMAL_ACTIVE;
 353
 354         return retval;
 355 }
 356
 357 /*
 358  * Function ircomm_tty_open (tty, filp)
 359  *
 360  *    This routine is called when a particular tty device is opened. This
 361  *    routine is mandatory; if this routine is not filled in, the attempted
 362  *    open will fail with ENODEV.
 363  */
 364 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 365 {
 366         struct ircomm_tty_cb *self;
 367         unsigned int line;
 368         unsigned long   flags;
 369         int ret;
 370
 371         IRDA_DEBUG(2, "%s()\n", __func__ );
 372
 373         line = tty->index;
 374         if ((line < 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 = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 383                 if (self == NULL) {
 384                         IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
 385                         return -ENOMEM;
 386                 }
 387
 388                 self->magic = IRCOMM_TTY_MAGIC;
 389                 self->flow = FLOW_STOP;
 390
 391                 self->line = line;
 392                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 393                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 394                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 395                 self->close_delay = 5*HZ/10;
 396                 self->closing_wait = 30*HZ;
 397
 398                 /* Init some important stuff */
 399                 init_timer(&self->watchdog_timer);
 400                 init_waitqueue_head(&self->open_wait);
 401                 init_waitqueue_head(&self->close_wait);
 402                 spin_lock_init(&self->spinlock);
 403
 404                 /*
 405                  * Force TTY into raw mode by default which is usually what
 406                  * we want for IrCOMM and IrLPT. This way applications will
 407                  * not have to twiddle with printcap etc.
 408                  */
 409                 tty->termios->c_iflag = 0;
 410                 tty->termios->c_oflag = 0;
 411
 412                 /* Insert into hash */
 413                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 414         }
 415         /* ++ is not atomic, so this should be protected - Jean II */
 416         spin_lock_irqsave(&self->spinlock, flags);
 417         self->open_count++;
 418
 419         tty->driver_data = self;
 420         self->tty = tty;
 421         spin_unlock_irqrestore(&self->spinlock, flags);
 422
 423         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 424                    self->line, self->open_count);
 425
 426         /* Not really used by us, but lets do it anyway */
 427         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 428
 429         /*
 430          * If the port is the middle of closing, bail out now
 431          */
 432         if (tty_hung_up_p(filp) ||
 433             test_bit(ASYNC_B_CLOSING, &self->flags)) {
 434
 435                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 436                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 437                  * IMHO it's either not needed in the first place
 438                  * or for some reason we need to make sure the async
 439                  * closing has been finished - if so, wouldn't we
 440                  * probably better sleep uninterruptible?
 441                  */
 442
 443                 if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
 444                         IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
 445                                      __func__);
 446                         return -ERESTARTSYS;
 447                 }
 448
 449 #ifdef SERIAL_DO_RESTART
 450                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
 451                         -EAGAIN : -ERESTARTSYS);
 452 #else
 453                 return -EAGAIN;
 454 #endif
 455         }
 456
 457         /* Check if this is a "normal" ircomm device, or an irlpt device */
 458         if (line < 0x10) {
 459                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 460                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 461                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 462                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 463                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
 464         } else {
 465                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
 466                 self->service_type = IRCOMM_3_WIRE_RAW;
 467                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 468         }
 469
 470         ret = ircomm_tty_startup(self);
 471         if (ret)
 472                 return ret;
 473
 474         ret = ircomm_tty_block_til_ready(self, filp);
 475         if (ret) {
 476                 IRDA_DEBUG(2,
 477                       "%s(), returning after block_til_ready with %d\n", __func__ ,
 478                       ret);
 479
 480                 return ret;
 481         }
 482         return 0;
 483 }
 484
 485 /*
 486  * Function ircomm_tty_close (tty, filp)
 487  *
 488  *    This routine is called when a particular tty device is closed.
 489  *
 490  */
 491 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 492 {
 493         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 494         unsigned long flags;
 495
 496         IRDA_DEBUG(0, "%s()\n", __func__ );
 497
 498         if (!tty)
 499                 return;
 500
 501         IRDA_ASSERT(self != NULL, return;);
 502         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 503
 504         spin_lock_irqsave(&self->spinlock, flags);
 505
 506         if (tty_hung_up_p(filp)) {
 507                 spin_unlock_irqrestore(&self->spinlock, flags);
 508
 509                 IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
 510                 return;
 511         }
 512
 513         if ((tty->count == 1) && (self->open_count != 1)) {
 514                 /*
 515                  * Uh, oh.  tty->count is 1, which means that the tty
 516                  * structure will be freed.  state->count should always
 517                  * be one in these conditions.  If it's greater than
 518                  * one, we've got real problems, since it means the
 519                  * serial port won't be shutdown.
 520                  */
 521                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 522                            "tty->count is 1, state->count is %d\n", __func__ ,
 523                            self->open_count);
 524                 self->open_count = 1;
 525         }
 526
 527         if (--self->open_count < 0) {
 528                 IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
 529                            __func__, self->line, self->open_count);
 530                 self->open_count = 0;
 531         }
 532         if (self->open_count) {
 533                 spin_unlock_irqrestore(&self->spinlock, flags);
 534
 535                 IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
 536                 return;
 537         }
 538
 539         /* Hum... Should be test_and_set_bit ??? - Jean II */
 540         set_bit(ASYNC_B_CLOSING, &self->flags);
 541
 542         /* We need to unlock here (we were unlocking at the end of this
 543          * function), because tty_wait_until_sent() may schedule.
 544          * I don't know if the rest should be protected somehow,
 545          * so someone should check. - Jean II */
 546         spin_unlock_irqrestore(&self->spinlock, flags);
 547
 548         /*
 549          * Now we wait for the transmit buffer to clear; and we notify
 550          * the line discipline to only process XON/XOFF characters.
 551          */
 552         tty->closing = 1;
 553         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 554                 tty_wait_until_sent(tty, self->closing_wait);
 555
 556         ircomm_tty_shutdown(self);
 557
 558         tty_driver_flush_buffer(tty);
 559         tty_ldisc_flush(tty);
 560
 561         tty->closing = 0;
 562         self->tty = NULL;
 563
 564         if (self->blocked_open) {
 565                 if (self->close_delay)
 566                         schedule_timeout_interruptible(self->close_delay);
 567                 wake_up_interruptible(&self->open_wait);
 568         }
 569
 570         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 571         wake_up_interruptible(&self->close_wait);
 572 }
 573
 574 /*
 575  * Function ircomm_tty_flush_buffer (tty)
 576  *
 577  *
 578  *
 579  */
 580 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 581 {
 582         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 583
 584         IRDA_ASSERT(self != NULL, return;);
 585         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 586
 587         /*
 588          * Let do_softint() do this to avoid race condition with
 589          * do_softint() ;-)
 590          */
 591         schedule_work(&self->tqueue);
 592 }
 593
 594 /*
 595  * Function ircomm_tty_do_softint (work)
 596  *
 597  *    We use this routine to give the write wakeup to the user at at a
 598  *    safe time (as fast as possible after write have completed). This
 599  *    can be compared to the Tx interrupt.
 600  */
 601 static void ircomm_tty_do_softint(struct work_struct *work)
 602 {
 603         struct ircomm_tty_cb *self =
 604                 container_of(work, struct ircomm_tty_cb, tqueue);
 605         struct tty_struct *tty;
 606         unsigned long flags;
 607         struct sk_buff *skb, *ctrl_skb;
 608
 609         IRDA_DEBUG(2, "%s()\n", __func__ );
 610
 611         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 612                 return;
 613
 614         tty = self->tty;
 615         if (!tty)
 616                 return;
 617
 618         /* Unlink control buffer */
 619         spin_lock_irqsave(&self->spinlock, flags);
 620
 621         ctrl_skb = self->ctrl_skb;
 622         self->ctrl_skb = NULL;
 623
 624         spin_unlock_irqrestore(&self->spinlock, flags);
 625
 626         /* Flush control buffer if any */
 627         if(ctrl_skb) {
 628                 if(self->flow == FLOW_START)
 629                         ircomm_control_request(self->ircomm, ctrl_skb);
 630                 /* Drop reference count - see ircomm_ttp_data_request(). */
 631                 dev_kfree_skb(ctrl_skb);
 632         }
 633
 634         if (tty->hw_stopped)
 635                 return;
 636
 637         /* Unlink transmit buffer */
 638         spin_lock_irqsave(&self->spinlock, flags);
 639
 640         skb = self->tx_skb;
 641         self->tx_skb = NULL;
 642
 643         spin_unlock_irqrestore(&self->spinlock, flags);
 644
 645         /* Flush transmit buffer if any */
 646         if (skb) {
 647                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 648                 /* Drop reference count - see ircomm_ttp_data_request(). */
 649                 dev_kfree_skb(skb);
 650         }
 651
 652         /* Check if user (still) wants to be waken up */
 653         tty_wakeup(tty);
 654 }
 655
 656 /*
 657  * Function ircomm_tty_write (tty, buf, count)
 658  *
 659  *    This routine is called by the kernel to write a series of characters
 660  *    to the tty device. The characters may come from user space or kernel
 661  *    space. This routine will return the number of characters actually
 662  *    accepted for writing. This routine is mandatory.
 663  */
 664 static int ircomm_tty_write(struct tty_struct *tty,
 665                             const unsigned char *buf, int count)
 666 {
 667         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 668         unsigned long flags;
 669         struct sk_buff *skb;
 670         int tailroom = 0;
 671         int len = 0;
 672         int size;
 673
 674         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 675                    tty->hw_stopped);
 676
 677         IRDA_ASSERT(self != NULL, return -1;);
 678         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 679
 680         /* We may receive packets from the TTY even before we have finished
 681          * our setup. Not cool.
 682          * The problem is that we don't know the final header and data size
 683          * to create the proper skb, so any skb we would create would have
 684          * bogus header and data size, so need care.
 685          * We use a bogus header size to safely detect this condition.
 686          * Another problem is that hw_stopped was set to 0 way before it
 687          * should be, so we would drop this skb. It should now be fixed.
 688          * One option is to not accept data until we are properly setup.
 689          * But, I suspect that when it happens, the ppp line discipline
 690          * just "drops" the data, which might screw up connect scripts.
 691          * The second option is to create a "safe skb", with large header
 692          * and small size (see ircomm_tty_open() for values).
 693          * We just need to make sure that when the real values get filled,
 694          * we don't mess up the original "safe skb" (see tx_data_size).
 695          * Jean II */
 696         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 697                 IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
 698 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 699                 /* We didn't consume anything, TTY will retry */
 700                 return 0;
 701 #endif
 702         }
 703
 704         if (count < 1)
 705                 return 0;
 706
 707         /* Protect our manipulation of self->tx_skb and related */
 708         spin_lock_irqsave(&self->spinlock, flags);
 709
 710         /* Fetch current transmit buffer */
 711         skb = self->tx_skb;
 712
 713         /*
 714          * Send out all the data we get, possibly as multiple fragmented
 715          * frames, but this will only happen if the data is larger than the
 716          * max data size. The normal case however is just the opposite, and
 717          * this function may be called multiple times, and will then actually
 718          * defragment the data and send it out as one packet as soon as
 719          * possible, but at a safer point in time
 720          */
 721         while (count) {
 722                 size = count;
 723
 724                 /* Adjust data size to the max data size */
 725                 if (size > self->max_data_size)
 726                         size = self->max_data_size;
 727
 728                 /*
 729                  * Do we already have a buffer ready for transmit, or do
 730                  * we need to allocate a new frame
 731                  */
 732                 if (skb) {
 733                         /*
 734                          * Any room for more data at the end of the current
 735                          * transmit buffer? Cannot use skb_tailroom, since
 736                          * dev_alloc_skb gives us a larger skb than we
 737                          * requested
 738                          * Note : use tx_data_size, because max_data_size
 739                          * may have changed and we don't want to overwrite
 740                          * the skb. - Jean II
 741                          */
 742                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 743                                 /* Adjust data to tailroom */
 744                                 if (size > tailroom)
 745                                         size = tailroom;
 746                         } else {
 747                                 /*
 748                                  * Current transmit frame is full, so break
 749                                  * out, so we can send it as soon as possible
 750                                  */
 751                                 break;
 752                         }
 753                 } else {
 754                         /* Prepare a full sized frame */
 755                         skb = alloc_skb(self->max_data_size+
 756                                         self->max_header_size,
 757                                         GFP_ATOMIC);
 758                         if (!skb) {
 759                                 spin_unlock_irqrestore(&self->spinlock, flags);
 760                                 return -ENOBUFS;
 761                         }
 762                         skb_reserve(skb, self->max_header_size);
 763                         self->tx_skb = skb;
 764                         /* Remember skb size because max_data_size may
 765                          * change later on - Jean II */
 766                         self->tx_data_size = self->max_data_size;
 767                 }
 768
 769                 /* Copy data */
 770                 memcpy(skb_put(skb,size), buf + len, size);
 771
 772                 count -= size;
 773                 len += size;
 774         }
 775
 776         spin_unlock_irqrestore(&self->spinlock, flags);
 777
 778         /*
 779          * Schedule a new thread which will transmit the frame as soon
 780          * as possible, but at a safe point in time. We do this so the
 781          * "user" can give us data multiple times, as PPP does (because of
 782          * its 256 byte tx buffer). We will then defragment and send out
 783          * all this data as one single packet.
 784          */
 785         schedule_work(&self->tqueue);
 786
 787         return len;
 788 }
 789
 790 /*
 791  * Function ircomm_tty_write_room (tty)
 792  *
 793  *    This routine returns the numbers of characters the tty driver will
 794  *    accept for queuing to be written. This number is subject to change as
 795  *    output buffers get emptied, or if the output flow control is acted.
 796  */
 797 static int ircomm_tty_write_room(struct tty_struct *tty)
 798 {
 799         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 800         unsigned long flags;
 801         int ret;
 802
 803         IRDA_ASSERT(self != NULL, return -1;);
 804         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 805
 806 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 807         /* max_header_size tells us if the channel is initialised or not. */
 808         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 809                 /* Don't bother us yet */
 810                 return 0;
 811 #endif
 812
 813         /* Check if we are allowed to transmit any data.
 814          * hw_stopped is the regular flow control.
 815          * Jean II */
 816         if (tty->hw_stopped)
 817                 ret = 0;
 818         else {
 819                 spin_lock_irqsave(&self->spinlock, flags);
 820                 if (self->tx_skb)
 821                         ret = self->tx_data_size - self->tx_skb->len;
 822                 else
 823                         ret = self->max_data_size;
 824                 spin_unlock_irqrestore(&self->spinlock, flags);
 825         }
 826         IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
 827
 828         return ret;
 829 }
 830
 831 /*
 832  * Function ircomm_tty_wait_until_sent (tty, timeout)
 833  *
 834  *    This routine waits until the device has written out all of the
 835  *    characters in its transmitter FIFO.
 836  */
 837 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 838 {
 839         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 840         unsigned long orig_jiffies, poll_time;
 841         unsigned long flags;
 842
 843         IRDA_DEBUG(2, "%s()\n", __func__ );
 844
 845         IRDA_ASSERT(self != NULL, return;);
 846         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 847
 848         orig_jiffies = jiffies;
 849
 850         /* Set poll time to 200 ms */
 851         poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
 852
 853         spin_lock_irqsave(&self->spinlock, flags);
 854         while (self->tx_skb && self->tx_skb->len) {
 855                 spin_unlock_irqrestore(&self->spinlock, flags);
 856                 schedule_timeout_interruptible(poll_time);
 857                 spin_lock_irqsave(&self->spinlock, flags);
 858                 if (signal_pending(current))
 859                         break;
 860                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 861                         break;
 862         }
 863         spin_unlock_irqrestore(&self->spinlock, flags);
 864         current->state = TASK_RUNNING;
 865 }
 866
 867 /*
 868  * Function ircomm_tty_throttle (tty)
 869  *
 870  *    This routine notifies the tty driver that input buffers for the line
 871  *    discipline are close to full, and it should somehow signal that no
 872  *    more characters should be sent to the tty.
 873  */
 874 static void ircomm_tty_throttle(struct tty_struct *tty)
 875 {
 876         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 877
 878         IRDA_DEBUG(2, "%s()\n", __func__ );
 879
 880         IRDA_ASSERT(self != NULL, return;);
 881         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 882
 883         /* Software flow control? */
 884         if (I_IXOFF(tty))
 885                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 886
 887         /* Hardware flow control? */
 888         if (tty->termios->c_cflag & CRTSCTS) {
 889                 self->settings.dte &= ~IRCOMM_RTS;
 890                 self->settings.dte |= IRCOMM_DELTA_RTS;
 891
 892                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 893         }
 894
 895         ircomm_flow_request(self->ircomm, FLOW_STOP);
 896 }
 897
 898 /*
 899  * Function ircomm_tty_unthrottle (tty)
 900  *
 901  *    This routine notifies the tty drivers that it should signals that
 902  *    characters can now be sent to the tty without fear of overrunning the
 903  *    input buffers of the line disciplines.
 904  */
 905 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 906 {
 907         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 908
 909         IRDA_DEBUG(2, "%s()\n", __func__ );
 910
 911         IRDA_ASSERT(self != NULL, return;);
 912         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 913
 914         /* Using software flow control? */
 915         if (I_IXOFF(tty)) {
 916                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 917         }
 918
 919         /* Using hardware flow control? */
 920         if (tty->termios->c_cflag & CRTSCTS) {
 921                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 922
 923                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 924                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
 925         }
 926         ircomm_flow_request(self->ircomm, FLOW_START);
 927 }
 928
 929 /*
 930  * Function ircomm_tty_chars_in_buffer (tty)
 931  *
 932  *    Indicates if there are any data in the buffer
 933  *
 934  */
 935 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 936 {
 937         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 938         unsigned long flags;
 939         int len = 0;
 940
 941         IRDA_ASSERT(self != NULL, return -1;);
 942         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 943
 944         spin_lock_irqsave(&self->spinlock, flags);
 945
 946         if (self->tx_skb)
 947                 len = self->tx_skb->len;
 948
 949         spin_unlock_irqrestore(&self->spinlock, flags);
 950
 951         return len;
 952 }
 953
 954 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 955 {
 956         unsigned long flags;
 957
 958         IRDA_ASSERT(self != NULL, return;);
 959         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 960
 961         IRDA_DEBUG(0, "%s()\n", __func__ );
 962
 963         if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
 964                 return;
 965
 966         ircomm_tty_detach_cable(self);
 967
 968         spin_lock_irqsave(&self->spinlock, flags);
 969
 970         del_timer(&self->watchdog_timer);
 971
 972         /* Free parameter buffer */
 973         if (self->ctrl_skb) {
 974                 dev_kfree_skb(self->ctrl_skb);
 975                 self->ctrl_skb = NULL;
 976         }
 977
 978         /* Free transmit buffer */
 979         if (self->tx_skb) {
 980                 dev_kfree_skb(self->tx_skb);
 981                 self->tx_skb = NULL;
 982         }
 983
 984         if (self->ircomm) {
 985                 ircomm_close(self->ircomm);
 986                 self->ircomm = NULL;
 987         }
 988
 989         spin_unlock_irqrestore(&self->spinlock, flags);
 990 }
 991
 992 /*
 993  * Function ircomm_tty_hangup (tty)
 994  *
 995  *    This routine notifies the tty driver that it should hangup the tty
 996  *    device.
 997  *
 998  */
 999 static void ircomm_tty_hangup(struct tty_struct *tty)
1000 {
1001         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1002         unsigned long   flags;
1003
1004         IRDA_DEBUG(0, "%s()\n", __func__ );
1005
1006         IRDA_ASSERT(self != NULL, return;);
1007         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1008
1009         if (!tty)
1010                 return;
1011
1012         /* ircomm_tty_flush_buffer(tty); */
1013         ircomm_tty_shutdown(self);
1014
1015         /* I guess we need to lock here - Jean II */
1016         spin_lock_irqsave(&self->spinlock, flags);
1017         self->flags &= ~ASYNC_NORMAL_ACTIVE;
1018         self->tty = NULL;
1019         self->open_count = 0;
1020         spin_unlock_irqrestore(&self->spinlock, flags);
1021
1022         wake_up_interruptible(&self->open_wait);
1023 }
1024
1025 /*
1026  * Function ircomm_tty_send_xchar (tty, ch)
1027  *
1028  *    This routine is used to send a high-priority XON/XOFF character to
1029  *    the device.
1030  */
1031 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1032 {
1033         IRDA_DEBUG(0, "%s(), not impl\n", __func__ );
1034 }
1035
1036 /*
1037  * Function ircomm_tty_start (tty)
1038  *
1039  *    This routine notifies the tty driver that it resume sending
1040  *    characters to the tty device.
1041  */
1042 void ircomm_tty_start(struct tty_struct *tty)
1043 {
1044         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1045
1046         ircomm_flow_request(self->ircomm, FLOW_START);
1047 }
1048
1049 /*
1050  * Function ircomm_tty_stop (tty)
1051  *
1052  *     This routine notifies the tty driver that it should stop outputting
1053  *     characters to the tty device.
1054  */
1055 static void ircomm_tty_stop(struct tty_struct *tty)
1056 {
1057         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1058
1059         IRDA_ASSERT(self != NULL, return;);
1060         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1061
1062         ircomm_flow_request(self->ircomm, FLOW_STOP);
1063 }
1064
1065 /*
1066  * Function ircomm_check_modem_status (self)
1067  *
1068  *    Check for any changes in the DCE's line settings. This function should
1069  *    be called whenever the dce parameter settings changes, to update the
1070  *    flow control settings and other things
1071  */
1072 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1073 {
1074         struct tty_struct *tty;
1075         int status;
1076
1077         IRDA_DEBUG(0, "%s()\n", __func__ );
1078
1079         IRDA_ASSERT(self != NULL, return;);
1080         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1081
1082         tty = self->tty;
1083
1084         status = self->settings.dce;
1085
1086         if (status & IRCOMM_DCE_DELTA_ANY) {
1087                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1088         }
1089         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1090                 IRDA_DEBUG(2,
1091                            "%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1092                            (status & IRCOMM_CD) ? "on" : "off");
1093
1094                 if (status & IRCOMM_CD) {
1095                         wake_up_interruptible(&self->open_wait);
1096                 } else {
1097                         IRDA_DEBUG(2,
1098                                    "%s(), Doing serial hangup..\n", __func__ );
1099                         if (tty)
1100                                 tty_hangup(tty);
1101
1102                         /* Hangup will remote the tty, so better break out */
1103                         return;
1104                 }
1105         }
1106         if (self->flags & ASYNC_CTS_FLOW) {
1107                 if (tty->hw_stopped) {
1108                         if (status & IRCOMM_CTS) {
1109                                 IRDA_DEBUG(2,
1110                                            "%s(), CTS tx start...\n", __func__ );
1111                                 tty->hw_stopped = 0;
1112
1113                                 /* Wake up processes blocked on open */
1114                                 wake_up_interruptible(&self->open_wait);
1115
1116                                 schedule_work(&self->tqueue);
1117                                 return;
1118                         }
1119                 } else {
1120                         if (!(status & IRCOMM_CTS)) {
1121                                 IRDA_DEBUG(2,
1122                                            "%s(), CTS tx stop...\n", __func__ );
1123                                 tty->hw_stopped = 1;
1124                         }
1125                 }
1126         }
1127 }
1128
1129 /*
1130  * Function ircomm_tty_data_indication (instance, sap, skb)
1131  *
1132  *    Handle incoming data, and deliver it to the line discipline
1133  *
1134  */
1135 static int ircomm_tty_data_indication(void *instance, void *sap,
1136                                       struct sk_buff *skb)
1137 {
1138         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1139         struct tty_ldisc *ld;
1140
1141         IRDA_DEBUG(2, "%s()\n", __func__ );
1142
1143         IRDA_ASSERT(self != NULL, return -1;);
1144         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1145         IRDA_ASSERT(skb != NULL, return -1;);
1146
1147         if (!self->tty) {
1148                 IRDA_DEBUG(0, "%s(), no tty!\n", __func__ );
1149                 return 0;
1150         }
1151
1152         /*
1153          * If we receive data when hardware is stopped then something is wrong.
1154          * We try to poll the peers line settings to check if we are up todate.
1155          * Devices like WinCE can do this, and since they don't send any
1156          * params, we can just as well declare the hardware for running.
1157          */
1158         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1159                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __func__ );
1160                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1161
1162                 /* We can just as well declare the hardware for running */
1163                 ircomm_tty_send_initial_parameters(self);
1164                 ircomm_tty_link_established(self);
1165         }
1166
1167         /*
1168          * Just give it over to the line discipline. There is no need to
1169          * involve the flip buffers, since we are not running in an interrupt
1170          * handler
1171          */
1172
1173         ld = tty_ldisc_ref(self->tty);
1174         if (ld)
1175                 ld->ops->receive_buf(self->tty, skb->data, NULL, skb->len);
1176         tty_ldisc_deref(ld);
1177
1178         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1179
1180         return 0;
1181 }
1182
1183 /*
1184  * Function ircomm_tty_control_indication (instance, sap, skb)
1185  *
1186  *    Parse all incoming parameters (easy!)
1187  *
1188  */
1189 static int ircomm_tty_control_indication(void *instance, void *sap,
1190                                          struct sk_buff *skb)
1191 {
1192         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1193         int clen;
1194
1195         IRDA_DEBUG(4, "%s()\n", __func__ );
1196
1197         IRDA_ASSERT(self != NULL, return -1;);
1198         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1199         IRDA_ASSERT(skb != NULL, return -1;);
1200
1201         clen = skb->data[0];
1202
1203         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1204                                &ircomm_param_info);
1205
1206         /* No need to kfree_skb - see ircomm_control_indication() */
1207
1208         return 0;
1209 }
1210
1211 /*
1212  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1213  *
1214  *    This function is called by IrTTP when it wants us to slow down the
1215  *    transmission of data. We just mark the hardware as stopped, and wait
1216  *    for IrTTP to notify us that things are OK again.
1217  */
1218 static void ircomm_tty_flow_indication(void *instance, void *sap,
1219                                        LOCAL_FLOW cmd)
1220 {
1221         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1222         struct tty_struct *tty;
1223
1224         IRDA_ASSERT(self != NULL, return;);
1225         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1226
1227         tty = self->tty;
1228
1229         switch (cmd) {
1230         case FLOW_START:
1231                 IRDA_DEBUG(2, "%s(), hw start!\n", __func__ );
1232                 tty->hw_stopped = 0;
1233
1234                 /* ircomm_tty_do_softint will take care of the rest */
1235                 schedule_work(&self->tqueue);
1236                 break;
1237         default:  /* If we get here, something is very wrong, better stop */
1238         case FLOW_STOP:
1239                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __func__ );
1240                 tty->hw_stopped = 1;
1241                 break;
1242         }
1243         self->flow = cmd;
1244 }
1245
1246 #ifdef CONFIG_PROC_FS
1247 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1248 {
1249         int  ret=0;
1250
1251         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1252
1253         ret += sprintf(buf+ret, "Service type: ");
1254         if (self->service_type & IRCOMM_9_WIRE)
1255                 ret += sprintf(buf+ret, "9_WIRE");
1256         else if (self->service_type & IRCOMM_3_WIRE)
1257                 ret += sprintf(buf+ret, "3_WIRE");
1258         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1259                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1260         else
1261                 ret += sprintf(buf+ret, "No common service type!\n");
1262         ret += sprintf(buf+ret, "\n");
1263
1264         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1265
1266         ret += sprintf(buf+ret, "DTE status: ");
1267         if (self->settings.dte & IRCOMM_RTS)
1268                 ret += sprintf(buf+ret, "RTS|");
1269         if (self->settings.dte & IRCOMM_DTR)
1270                 ret += sprintf(buf+ret, "DTR|");
1271         if (self->settings.dte)
1272                 ret--; /* remove the last | */
1273         ret += sprintf(buf+ret, "\n");
1274
1275         ret += sprintf(buf+ret, "DCE status: ");
1276         if (self->settings.dce & IRCOMM_CTS)
1277                 ret += sprintf(buf+ret, "CTS|");
1278         if (self->settings.dce & IRCOMM_DSR)
1279                 ret += sprintf(buf+ret, "DSR|");
1280         if (self->settings.dce & IRCOMM_CD)
1281                 ret += sprintf(buf+ret, "CD|");
1282         if (self->settings.dce & IRCOMM_RI)
1283                 ret += sprintf(buf+ret, "RI|");
1284         if (self->settings.dce)
1285                 ret--; /* remove the last | */
1286         ret += sprintf(buf+ret, "\n");
1287
1288         ret += sprintf(buf+ret, "Configuration: ");
1289         if (!self->settings.null_modem)
1290                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1291         else
1292                 ret += sprintf(buf+ret,
1293                                "DTE <-> DTE (null modem emulation)\n");
1294
1295         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1296
1297         ret += sprintf(buf+ret, "Flow control: ");
1298         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1299                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1300         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1301                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1302         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1303                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1304         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1305                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1306         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1307                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1308         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1309                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1310         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1311                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1312         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1313                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1314         if (self->settings.flow_control)
1315                 ret--; /* remove the last | */
1316         ret += sprintf(buf+ret, "\n");
1317
1318         ret += sprintf(buf+ret, "Flags: ");
1319         if (self->flags & ASYNC_CTS_FLOW)
1320                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1321         if (self->flags & ASYNC_CHECK_CD)
1322                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1323         if (self->flags & ASYNC_INITIALIZED)
1324                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1325         if (self->flags & ASYNC_LOW_LATENCY)
1326                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1327         if (self->flags & ASYNC_CLOSING)
1328                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1329         if (self->flags & ASYNC_NORMAL_ACTIVE)
1330                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1331         if (self->flags)
1332                 ret--; /* remove the last | */
1333         ret += sprintf(buf+ret, "\n");
1334
1335         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1336                        "client" : "server");
1337         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1338         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1339         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1340
1341         if (self->tty)
1342                 ret += sprintf(buf+ret, "Hardware: %s\n",
1343                                self->tty->hw_stopped ? "Stopped" : "Running");
1344
1345         ret += sprintf(buf+ret, "\n");
1346         return ret;
1347 }
1348
1349
1350 /*
1351  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1352  *
1353  *
1354  *
1355  */
1356 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1357                                 int *eof, void *unused)
1358 {
1359         struct ircomm_tty_cb *self;
1360         int count = 0, l;
1361         off_t begin = 0;
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1365
1366         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1367         while ((self != NULL) && (count < 4000)) {
1368                 if (self->magic != IRCOMM_TTY_MAGIC)
1369                         break;
1370
1371                 l = ircomm_tty_line_info(self, buf + count);
1372                 count += l;
1373                 if (count+begin > offset+len)
1374                         goto done;
1375                 if (count+begin < offset) {
1376                         begin += count;
1377                         count = 0;
1378                 }
1379
1380                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1381         }
1382         *eof = 1;
1383 done:
1384         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1385
1386         if (offset >= count+begin)
1387                 return 0;
1388         *start = buf + (offset-begin);
1389         return ((len < begin+count-offset) ? len : begin+count-offset);
1390 }
1391 #endif /* CONFIG_PROC_FS */
1392
1393 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1394 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1395 MODULE_LICENSE("GPL");
1396 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1397
1398 module_init(ircomm_tty_init);
1399 module_exit(ircomm_tty_cleanup);