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