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