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