kernel/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, see <http://www.gnu.org/licenses/>.
  28  *
  29  ********************************************************************/
  30
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/fs.h>
  34 #include <linux/slab.h>
  35 #include <linux/sched.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/termios.h>
  38 #include <linux/tty.h>
  39 #include <linux/tty_flip.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/device.h>               /* for MODULE_ALIAS_CHARDEV_MAJOR */
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <net/irda/irda.h>
  46 #include <net/irda/irmod.h>
  47
  48 #include <net/irda/ircomm_core.h>
  49 #include <net/irda/ircomm_param.h>
  50 #include <net/irda/ircomm_tty_attach.h>
  51 #include <net/irda/ircomm_tty.h>
  52
  53 static int ircomm_tty_install(struct tty_driver *driver,
  54                 struct tty_struct *tty);
  55 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  56 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  57 static int  ircomm_tty_write(struct tty_struct * tty,
  58                              const unsigned char *buf, int count);
  59 static int  ircomm_tty_write_room(struct tty_struct *tty);
  60 static void ircomm_tty_throttle(struct tty_struct *tty);
  61 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  62 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  63 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  64 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  65 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  66 static void ircomm_tty_hangup(struct tty_struct *tty);
  67 static void ircomm_tty_do_softint(struct work_struct *work);
  68 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  69 static void ircomm_tty_stop(struct tty_struct *tty);
  70
  71 static int ircomm_tty_data_indication(void *instance, void *sap,
  72                                       struct sk_buff *skb);
  73 static int ircomm_tty_control_indication(void *instance, void *sap,
  74                                          struct sk_buff *skb);
  75 static void ircomm_tty_flow_indication(void *instance, void *sap,
  76                                        LOCAL_FLOW cmd);
  77 #ifdef CONFIG_PROC_FS
  78 static const struct file_operations ircomm_tty_proc_fops;
  79 #endif /* CONFIG_PROC_FS */
  80 static struct tty_driver *driver;
  81
  82 static hashbin_t *ircomm_tty = NULL;
  83
  84 static const struct tty_operations ops = {
  85         .install         = ircomm_tty_install,
  86         .open            = ircomm_tty_open,
  87         .close           = ircomm_tty_close,
  88         .write           = ircomm_tty_write,
  89         .write_room      = ircomm_tty_write_room,
  90         .chars_in_buffer = ircomm_tty_chars_in_buffer,
  91         .flush_buffer    = ircomm_tty_flush_buffer,
  92         .ioctl           = ircomm_tty_ioctl,    /* ircomm_tty_ioctl.c */
  93         .tiocmget        = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
  94         .tiocmset        = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
  95         .throttle        = ircomm_tty_throttle,
  96         .unthrottle      = ircomm_tty_unthrottle,
  97         .send_xchar      = ircomm_tty_send_xchar,
  98         .set_termios     = ircomm_tty_set_termios,
  99         .stop            = ircomm_tty_stop,
 100         .start           = ircomm_tty_start,
 101         .hangup          = ircomm_tty_hangup,
 102         .wait_until_sent = ircomm_tty_wait_until_sent,
 103 #ifdef CONFIG_PROC_FS
 104         .proc_fops       = &ircomm_tty_proc_fops,
 105 #endif /* CONFIG_PROC_FS */
 106 };
 107
 108 static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
 109 {
 110         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 111                         port);
 112         /*
 113          * Here, we use to lock those two guys, but as ircomm_param_request()
 114          * does it itself, I don't see the point (and I see the deadlock).
 115          * Jean II
 116          */
 117         if (raise)
 118                 self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
 119         else
 120                 self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
 121
 122         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 123 }
 124
 125 static int ircomm_port_carrier_raised(struct tty_port *port)
 126 {
 127         struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
 128                         port);
 129         return self->settings.dce & IRCOMM_CD;
 130 }
 131
 132 static const struct tty_port_operations ircomm_port_ops = {
 133         .dtr_rts = ircomm_port_raise_dtr_rts,
 134         .carrier_raised = ircomm_port_carrier_raised,
 135 };
 136
 137 /*
 138  * Function ircomm_tty_init()
 139  *
 140  *    Init IrCOMM TTY layer/driver
 141  *
 142  */
 143 static int __init ircomm_tty_init(void)
 144 {
 145         driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
 146         if (!driver)
 147                 return -ENOMEM;
 148         ircomm_tty = hashbin_new(HB_LOCK);
 149         if (ircomm_tty == NULL) {
 150                 net_err_ratelimited("%s(), can't allocate hashbin!\n",
 151                                     __func__);
 152                 put_tty_driver(driver);
 153                 return -ENOMEM;
 154         }
 155
 156         driver->driver_name     = "ircomm";
 157         driver->name            = "ircomm";
 158         driver->major           = IRCOMM_TTY_MAJOR;
 159         driver->minor_start     = IRCOMM_TTY_MINOR;
 160         driver->type            = TTY_DRIVER_TYPE_SERIAL;
 161         driver->subtype         = SERIAL_TYPE_NORMAL;
 162         driver->init_termios    = tty_std_termios;
 163         driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 164         driver->flags           = TTY_DRIVER_REAL_RAW;
 165         tty_set_operations(driver, &ops);
 166         if (tty_register_driver(driver)) {
 167                 net_err_ratelimited("%s(): Couldn't register serial driver\n",
 168                                     __func__);
 169                 put_tty_driver(driver);
 170                 return -1;
 171         }
 172         return 0;
 173 }
 174
 175 static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 176 {
 177         IRDA_ASSERT(self != NULL, return;);
 178         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 179
 180         ircomm_tty_shutdown(self);
 181
 182         self->magic = 0;
 183         tty_port_destroy(&self->port);
 184         kfree(self);
 185 }
 186
 187 /*
 188  * Function ircomm_tty_cleanup ()
 189  *
 190  *    Remove IrCOMM TTY layer/driver
 191  *
 192  */
 193 static void __exit ircomm_tty_cleanup(void)
 194 {
 195         int ret;
 196
 197         ret = tty_unregister_driver(driver);
 198         if (ret) {
 199                 net_err_ratelimited("%s(), failed to unregister driver\n",
 200                                     __func__);
 201                 return;
 202         }
 203
 204         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 205         put_tty_driver(driver);
 206 }
 207
 208 /*
 209  * Function ircomm_startup (self)
 210  *
 211  *
 212  *
 213  */
 214 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 215 {
 216         notify_t notify;
 217         int ret = -ENODEV;
 218
 219         IRDA_ASSERT(self != NULL, return -1;);
 220         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 221
 222         /* Check if already open */
 223         if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
 224                 pr_debug("%s(), already open so break out!\n", __func__);
 225                 return 0;
 226         }
 227
 228         /* Register with IrCOMM */
 229         irda_notify_init(&notify);
 230         /* These callbacks we must handle ourselves */
 231         notify.data_indication       = ircomm_tty_data_indication;
 232         notify.udata_indication      = ircomm_tty_control_indication;
 233         notify.flow_indication       = ircomm_tty_flow_indication;
 234
 235         /* Use the ircomm_tty interface for these ones */
 236         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 237         notify.connect_confirm       = ircomm_tty_connect_confirm;
 238         notify.connect_indication    = ircomm_tty_connect_indication;
 239         strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
 240         notify.instance = self;
 241
 242         if (!self->ircomm) {
 243                 self->ircomm = ircomm_open(&notify, self->service_type,
 244                                            self->line);
 245         }
 246         if (!self->ircomm)
 247                 goto err;
 248
 249         self->slsap_sel = self->ircomm->slsap_sel;
 250
 251         /* Connect IrCOMM link with remote device */
 252         ret = ircomm_tty_attach_cable(self);
 253         if (ret < 0) {
 254                 net_err_ratelimited("%s(), error attaching cable!\n", __func__);
 255                 goto err;
 256         }
 257
 258         return 0;
 259 err:
 260         clear_bit(ASYNCB_INITIALIZED, &self->port.flags);
 261         return ret;
 262 }
 263
 264 /*
 265  * Function ircomm_block_til_ready (self, filp)
 266  *
 267  *
 268  *
 269  */
 270 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 271                 struct tty_struct *tty, struct file *filp)
 272 {
 273         struct tty_port *port = &self->port;
 274         DECLARE_WAITQUEUE(wait, current);
 275         int             retval;
 276         int             do_clocal = 0;
 277         unsigned long   flags;
 278
 279         /*
 280          * If non-blocking mode is set, or the port is not enabled,
 281          * then make the check up front and then exit.
 282          */
 283         if (test_bit(TTY_IO_ERROR, &tty->flags)) {
 284                 port->flags |= ASYNC_NORMAL_ACTIVE;
 285                 return 0;
 286         }
 287
 288         if (filp->f_flags & O_NONBLOCK) {
 289                 /* nonblock mode is set */
 290                 if (tty->termios.c_cflag & CBAUD)
 291                         tty_port_raise_dtr_rts(port);
 292                 port->flags |= ASYNC_NORMAL_ACTIVE;
 293                 pr_debug("%s(), O_NONBLOCK requested!\n", __func__);
 294                 return 0;
 295         }
 296
 297         if (tty->termios.c_cflag & CLOCAL) {
 298                 pr_debug("%s(), doing CLOCAL!\n", __func__);
 299                 do_clocal = 1;
 300         }
 301
 302         /* Wait for carrier detect and the line to become
 303          * free (i.e., not in use by the callout).  While we are in
 304          * this loop, port->count is dropped by one, so that
 305          * mgsl_close() knows when to free things.  We restore it upon
 306          * exit, either normal or abnormal.
 307          */
 308
 309         retval = 0;
 310         add_wait_queue(&port->open_wait, &wait);
 311
 312         pr_debug("%s(%d):block_til_ready before block on %s open_count=%d\n",
 313                  __FILE__, __LINE__, tty->driver->name, port->count);
 314
 315         spin_lock_irqsave(&port->lock, flags);
 316         port->count--;
 317         port->blocked_open++;
 318         spin_unlock_irqrestore(&port->lock, flags);
 319
 320         while (1) {
 321                 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
 322                         tty_port_raise_dtr_rts(port);
 323
 324                 set_current_state(TASK_INTERRUPTIBLE);
 325
 326                 if (tty_hung_up_p(filp) ||
 327                     !test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 328                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
 329                                         -EAGAIN : -ERESTARTSYS;
 330                         break;
 331                 }
 332
 333                 /*
 334                  * Check if link is ready now. Even if CLOCAL is
 335                  * specified, we cannot return before the IrCOMM link is
 336                  * ready
 337                  */
 338                 if (!test_bit(ASYNCB_CLOSING, &port->flags) &&
 339                     (do_clocal || tty_port_carrier_raised(port)) &&
 340                     self->state == IRCOMM_TTY_READY)
 341                 {
 342                         break;
 343                 }
 344
 345                 if (signal_pending(current)) {
 346                         retval = -ERESTARTSYS;
 347                         break;
 348                 }
 349
 350                 pr_debug("%s(%d):block_til_ready blocking on %s open_count=%d\n",
 351                          __FILE__, __LINE__, tty->driver->name, port->count);
 352
 353                 schedule();
 354         }
 355
 356         __set_current_state(TASK_RUNNING);
 357         remove_wait_queue(&port->open_wait, &wait);
 358
 359         spin_lock_irqsave(&port->lock, flags);
 360         if (!tty_hung_up_p(filp))
 361                 port->count++;
 362         port->blocked_open--;
 363         spin_unlock_irqrestore(&port->lock, flags);
 364
 365         pr_debug("%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 366                  __FILE__, __LINE__, tty->driver->name, port->count);
 367
 368         if (!retval)
 369                 port->flags |= ASYNC_NORMAL_ACTIVE;
 370
 371         return retval;
 372 }
 373
 374
 375 static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 376 {
 377         struct ircomm_tty_cb *self;
 378         unsigned int line = tty->index;
 379
 380         /* Check if instance already exists */
 381         self = hashbin_lock_find(ircomm_tty, line, NULL);
 382         if (!self) {
 383                 /* No, so make new instance */
 384                 self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 385                 if (self == NULL)
 386                         return -ENOMEM;
 387
 388                 tty_port_init(&self->port);
 389                 self->port.ops = &ircomm_port_ops;
 390                 self->magic = IRCOMM_TTY_MAGIC;
 391                 self->flow = FLOW_STOP;
 392
 393                 self->line = line;
 394                 INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
 395                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 396                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 397
 398                 /* Init some important stuff */
 399                 init_timer(&self->watchdog_timer);
 400                 spin_lock_init(&self->spinlock);
 401
 402                 /*
 403                  * Force TTY into raw mode by default which is usually what
 404                  * we want for IrCOMM and IrLPT. This way applications will
 405                  * not have to twiddle with printcap etc.
 406                  *
 407                  * Note this is completely usafe and doesn't work properly
 408                  */
 409                 tty->termios.c_iflag = 0;
 410                 tty->termios.c_oflag = 0;
 411
 412                 /* Insert into hash */
 413                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 414         }
 415
 416         tty->driver_data = self;
 417
 418         return tty_port_install(&self->port, driver, tty);
 419 }
 420
 421 /*
 422  * Function ircomm_tty_open (tty, filp)
 423  *
 424  *    This routine is called when a particular tty device is opened. This
 425  *    routine is mandatory; if this routine is not filled in, the attempted
 426  *    open will fail with ENODEV.
 427  */
 428 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 429 {
 430         struct ircomm_tty_cb *self = tty->driver_data;
 431         unsigned long   flags;
 432         int ret;
 433
 434         /* ++ is not atomic, so this should be protected - Jean II */
 435         spin_lock_irqsave(&self->port.lock, flags);
 436         self->port.count++;
 437         spin_unlock_irqrestore(&self->port.lock, flags);
 438         tty_port_tty_set(&self->port, tty);
 439
 440         pr_debug("%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
 441                  self->line, self->port.count);
 442
 443         /* Not really used by us, but lets do it anyway */
 444         self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 445
 446         /*
 447          * If the port is the middle of closing, bail out now
 448          */
 449         if (test_bit(ASYNCB_CLOSING, &self->port.flags)) {
 450
 451                 /* Hm, why are we blocking on ASYNC_CLOSING if we
 452                  * do return -EAGAIN/-ERESTARTSYS below anyway?
 453                  * IMHO it's either not needed in the first place
 454                  * or for some reason we need to make sure the async
 455                  * closing has been finished - if so, wouldn't we
 456                  * probably better sleep uninterruptible?
 457                  */
 458
 459                 if (wait_event_interruptible(self->port.close_wait,
 460                                 !test_bit(ASYNCB_CLOSING, &self->port.flags))) {
 461                         net_warn_ratelimited("%s - got signal while blocking on ASYNC_CLOSING!\n",
 462                                              __func__);
 463                         return -ERESTARTSYS;
 464                 }
 465
 466 #ifdef SERIAL_DO_RESTART
 467                 return (self->port.flags & ASYNC_HUP_NOTIFY) ?
 468                         -EAGAIN : -ERESTARTSYS;
 469 #else
 470                 return -EAGAIN;
 471 #endif
 472         }
 473
 474         /* Check if this is a "normal" ircomm device, or an irlpt device */
 475         if (self->line < 0x10) {
 476                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 477                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 478                 /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
 479                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
 480                 pr_debug("%s(), IrCOMM device\n", __func__);
 481         } else {
 482                 pr_debug("%s(), IrLPT device\n", __func__);
 483                 self->service_type = IRCOMM_3_WIRE_RAW;
 484                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 485         }
 486
 487         ret = ircomm_tty_startup(self);
 488         if (ret)
 489                 return ret;
 490
 491         ret = ircomm_tty_block_til_ready(self, tty, filp);
 492         if (ret) {
 493                 pr_debug("%s(), returning after block_til_ready with %d\n",
 494                          __func__, ret);
 495
 496                 return ret;
 497         }
 498         return 0;
 499 }
 500
 501 /*
 502  * Function ircomm_tty_close (tty, filp)
 503  *
 504  *    This routine is called when a particular tty device is closed.
 505  *
 506  */
 507 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 508 {
 509         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 510         struct tty_port *port = &self->port;
 511
 512         IRDA_ASSERT(self != NULL, return;);
 513         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 514
 515         if (tty_port_close_start(port, tty, filp) == 0)
 516                 return;
 517
 518         ircomm_tty_shutdown(self);
 519
 520         tty_driver_flush_buffer(tty);
 521
 522         tty_port_close_end(port, tty);
 523         tty_port_tty_set(port, NULL);
 524 }
 525
 526 /*
 527  * Function ircomm_tty_flush_buffer (tty)
 528  *
 529  *
 530  *
 531  */
 532 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 533 {
 534         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 535
 536         IRDA_ASSERT(self != NULL, return;);
 537         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 538
 539         /*
 540          * Let do_softint() do this to avoid race condition with
 541          * do_softint() ;-)
 542          */
 543         schedule_work(&self->tqueue);
 544 }
 545
 546 /*
 547  * Function ircomm_tty_do_softint (work)
 548  *
 549  *    We use this routine to give the write wakeup to the user at at a
 550  *    safe time (as fast as possible after write have completed). This
 551  *    can be compared to the Tx interrupt.
 552  */
 553 static void ircomm_tty_do_softint(struct work_struct *work)
 554 {
 555         struct ircomm_tty_cb *self =
 556                 container_of(work, struct ircomm_tty_cb, tqueue);
 557         struct tty_struct *tty;
 558         unsigned long flags;
 559         struct sk_buff *skb, *ctrl_skb;
 560
 561         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 562                 return;
 563
 564         tty = tty_port_tty_get(&self->port);
 565         if (!tty)
 566                 return;
 567
 568         /* Unlink control buffer */
 569         spin_lock_irqsave(&self->spinlock, flags);
 570
 571         ctrl_skb = self->ctrl_skb;
 572         self->ctrl_skb = NULL;
 573
 574         spin_unlock_irqrestore(&self->spinlock, flags);
 575
 576         /* Flush control buffer if any */
 577         if(ctrl_skb) {
 578                 if(self->flow == FLOW_START)
 579                         ircomm_control_request(self->ircomm, ctrl_skb);
 580                 /* Drop reference count - see ircomm_ttp_data_request(). */
 581                 dev_kfree_skb(ctrl_skb);
 582         }
 583
 584         if (tty->hw_stopped)
 585                 goto put;
 586
 587         /* Unlink transmit buffer */
 588         spin_lock_irqsave(&self->spinlock, flags);
 589
 590         skb = self->tx_skb;
 591         self->tx_skb = NULL;
 592
 593         spin_unlock_irqrestore(&self->spinlock, flags);
 594
 595         /* Flush transmit buffer if any */
 596         if (skb) {
 597                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 598                 /* Drop reference count - see ircomm_ttp_data_request(). */
 599                 dev_kfree_skb(skb);
 600         }
 601
 602         /* Check if user (still) wants to be waken up */
 603         tty_wakeup(tty);
 604 put:
 605         tty_kref_put(tty);
 606 }
 607
 608 /*
 609  * Function ircomm_tty_write (tty, buf, count)
 610  *
 611  *    This routine is called by the kernel to write a series of characters
 612  *    to the tty device. The characters may come from user space or kernel
 613  *    space. This routine will return the number of characters actually
 614  *    accepted for writing. This routine is mandatory.
 615  */
 616 static int ircomm_tty_write(struct tty_struct *tty,
 617                             const unsigned char *buf, int count)
 618 {
 619         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 620         unsigned long flags;
 621         struct sk_buff *skb;
 622         int tailroom = 0;
 623         int len = 0;
 624         int size;
 625
 626         pr_debug("%s(), count=%d, hw_stopped=%d\n", __func__ , count,
 627                  tty->hw_stopped);
 628
 629         IRDA_ASSERT(self != NULL, return -1;);
 630         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 631
 632         /* We may receive packets from the TTY even before we have finished
 633          * our setup. Not cool.
 634          * The problem is that we don't know the final header and data size
 635          * to create the proper skb, so any skb we would create would have
 636          * bogus header and data size, so need care.
 637          * We use a bogus header size to safely detect this condition.
 638          * Another problem is that hw_stopped was set to 0 way before it
 639          * should be, so we would drop this skb. It should now be fixed.
 640          * One option is to not accept data until we are properly setup.
 641          * But, I suspect that when it happens, the ppp line discipline
 642          * just "drops" the data, which might screw up connect scripts.
 643          * The second option is to create a "safe skb", with large header
 644          * and small size (see ircomm_tty_open() for values).
 645          * We just need to make sure that when the real values get filled,
 646          * we don't mess up the original "safe skb" (see tx_data_size).
 647          * Jean II */
 648         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 649                 pr_debug("%s() : not initialised\n", __func__);
 650 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 651                 /* We didn't consume anything, TTY will retry */
 652                 return 0;
 653 #endif
 654         }
 655
 656         if (count < 1)
 657                 return 0;
 658
 659         /* Protect our manipulation of self->tx_skb and related */
 660         spin_lock_irqsave(&self->spinlock, flags);
 661
 662         /* Fetch current transmit buffer */
 663         skb = self->tx_skb;
 664
 665         /*
 666          * Send out all the data we get, possibly as multiple fragmented
 667          * frames, but this will only happen if the data is larger than the
 668          * max data size. The normal case however is just the opposite, and
 669          * this function may be called multiple times, and will then actually
 670          * defragment the data and send it out as one packet as soon as
 671          * possible, but at a safer point in time
 672          */
 673         while (count) {
 674                 size = count;
 675
 676                 /* Adjust data size to the max data size */
 677                 if (size > self->max_data_size)
 678                         size = self->max_data_size;
 679
 680                 /*
 681                  * Do we already have a buffer ready for transmit, or do
 682                  * we need to allocate a new frame
 683                  */
 684                 if (skb) {
 685                         /*
 686                          * Any room for more data at the end of the current
 687                          * transmit buffer? Cannot use skb_tailroom, since
 688                          * dev_alloc_skb gives us a larger skb than we
 689                          * requested
 690                          * Note : use tx_data_size, because max_data_size
 691                          * may have changed and we don't want to overwrite
 692                          * the skb. - Jean II
 693                          */
 694                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 695                                 /* Adjust data to tailroom */
 696                                 if (size > tailroom)
 697                                         size = tailroom;
 698                         } else {
 699                                 /*
 700                                  * Current transmit frame is full, so break
 701                                  * out, so we can send it as soon as possible
 702                                  */
 703                                 break;
 704                         }
 705                 } else {
 706                         /* Prepare a full sized frame */
 707                         skb = alloc_skb(self->max_data_size+
 708                                         self->max_header_size,
 709                                         GFP_ATOMIC);
 710                         if (!skb) {
 711                                 spin_unlock_irqrestore(&self->spinlock, flags);
 712                                 return -ENOBUFS;
 713                         }
 714                         skb_reserve(skb, self->max_header_size);
 715                         self->tx_skb = skb;
 716                         /* Remember skb size because max_data_size may
 717                          * change later on - Jean II */
 718                         self->tx_data_size = self->max_data_size;
 719                 }
 720
 721                 /* Copy data */
 722                 memcpy(skb_put(skb,size), buf + len, size);
 723
 724                 count -= size;
 725                 len += size;
 726         }
 727
 728         spin_unlock_irqrestore(&self->spinlock, flags);
 729
 730         /*
 731          * Schedule a new thread which will transmit the frame as soon
 732          * as possible, but at a safe point in time. We do this so the
 733          * "user" can give us data multiple times, as PPP does (because of
 734          * its 256 byte tx buffer). We will then defragment and send out
 735          * all this data as one single packet.
 736          */
 737         schedule_work(&self->tqueue);
 738
 739         return len;
 740 }
 741
 742 /*
 743  * Function ircomm_tty_write_room (tty)
 744  *
 745  *    This routine returns the numbers of characters the tty driver will
 746  *    accept for queuing to be written. This number is subject to change as
 747  *    output buffers get emptied, or if the output flow control is acted.
 748  */
 749 static int ircomm_tty_write_room(struct tty_struct *tty)
 750 {
 751         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 752         unsigned long flags;
 753         int ret;
 754
 755         IRDA_ASSERT(self != NULL, return -1;);
 756         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 757
 758 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 759         /* max_header_size tells us if the channel is initialised or not. */
 760         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 761                 /* Don't bother us yet */
 762                 return 0;
 763 #endif
 764
 765         /* Check if we are allowed to transmit any data.
 766          * hw_stopped is the regular flow control.
 767          * Jean II */
 768         if (tty->hw_stopped)
 769                 ret = 0;
 770         else {
 771                 spin_lock_irqsave(&self->spinlock, flags);
 772                 if (self->tx_skb)
 773                         ret = self->tx_data_size - self->tx_skb->len;
 774                 else
 775                         ret = self->max_data_size;
 776                 spin_unlock_irqrestore(&self->spinlock, flags);
 777         }
 778         pr_debug("%s(), ret=%d\n", __func__ , ret);
 779
 780         return ret;
 781 }
 782
 783 /*
 784  * Function ircomm_tty_wait_until_sent (tty, timeout)
 785  *
 786  *    This routine waits until the device has written out all of the
 787  *    characters in its transmitter FIFO.
 788  */
 789 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 790 {
 791         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 792         unsigned long orig_jiffies, poll_time;
 793         unsigned long flags;
 794
 795         IRDA_ASSERT(self != NULL, return;);
 796         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 797
 798         orig_jiffies = jiffies;
 799
 800         /* Set poll time to 200 ms */
 801         poll_time = msecs_to_jiffies(200);
 802         if (timeout)
 803                 poll_time = min_t(unsigned long, timeout, poll_time);
 804
 805         spin_lock_irqsave(&self->spinlock, flags);
 806         while (self->tx_skb && self->tx_skb->len) {
 807                 spin_unlock_irqrestore(&self->spinlock, flags);
 808                 schedule_timeout_interruptible(poll_time);
 809                 spin_lock_irqsave(&self->spinlock, flags);
 810                 if (signal_pending(current))
 811                         break;
 812                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 813                         break;
 814         }
 815         spin_unlock_irqrestore(&self->spinlock, flags);
 816         __set_current_state(TASK_RUNNING);
 817 }
 818
 819 /*
 820  * Function ircomm_tty_throttle (tty)
 821  *
 822  *    This routine notifies the tty driver that input buffers for the line
 823  *    discipline are close to full, and it should somehow signal that no
 824  *    more characters should be sent to the tty.
 825  */
 826 static void ircomm_tty_throttle(struct tty_struct *tty)
 827 {
 828         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 829
 830         IRDA_ASSERT(self != NULL, return;);
 831         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 832
 833         /* Software flow control? */
 834         if (I_IXOFF(tty))
 835                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 836
 837         /* Hardware flow control? */
 838         if (tty->termios.c_cflag & CRTSCTS) {
 839                 self->settings.dte &= ~IRCOMM_RTS;
 840                 self->settings.dte |= IRCOMM_DELTA_RTS;
 841
 842                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 843         }
 844
 845         ircomm_flow_request(self->ircomm, FLOW_STOP);
 846 }
 847
 848 /*
 849  * Function ircomm_tty_unthrottle (tty)
 850  *
 851  *    This routine notifies the tty drivers that it should signals that
 852  *    characters can now be sent to the tty without fear of overrunning the
 853  *    input buffers of the line disciplines.
 854  */
 855 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 856 {
 857         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 858
 859         IRDA_ASSERT(self != NULL, return;);
 860         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 861
 862         /* Using software flow control? */
 863         if (I_IXOFF(tty)) {
 864                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 865         }
 866
 867         /* Using hardware flow control? */
 868         if (tty->termios.c_cflag & CRTSCTS) {
 869                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 870
 871                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 872                 pr_debug("%s(), FLOW_START\n", __func__);
 873         }
 874         ircomm_flow_request(self->ircomm, FLOW_START);
 875 }
 876
 877 /*
 878  * Function ircomm_tty_chars_in_buffer (tty)
 879  *
 880  *    Indicates if there are any data in the buffer
 881  *
 882  */
 883 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 884 {
 885         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 886         unsigned long flags;
 887         int len = 0;
 888
 889         IRDA_ASSERT(self != NULL, return -1;);
 890         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 891
 892         spin_lock_irqsave(&self->spinlock, flags);
 893
 894         if (self->tx_skb)
 895                 len = self->tx_skb->len;
 896
 897         spin_unlock_irqrestore(&self->spinlock, flags);
 898
 899         return len;
 900 }
 901
 902 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 903 {
 904         unsigned long flags;
 905
 906         IRDA_ASSERT(self != NULL, return;);
 907         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 908
 909         if (!test_and_clear_bit(ASYNCB_INITIALIZED, &self->port.flags))
 910                 return;
 911
 912         ircomm_tty_detach_cable(self);
 913
 914         spin_lock_irqsave(&self->spinlock, flags);
 915
 916         del_timer(&self->watchdog_timer);
 917
 918         /* Free parameter buffer */
 919         if (self->ctrl_skb) {
 920                 dev_kfree_skb(self->ctrl_skb);
 921                 self->ctrl_skb = NULL;
 922         }
 923
 924         /* Free transmit buffer */
 925         if (self->tx_skb) {
 926                 dev_kfree_skb(self->tx_skb);
 927                 self->tx_skb = NULL;
 928         }
 929
 930         if (self->ircomm) {
 931                 ircomm_close(self->ircomm);
 932                 self->ircomm = NULL;
 933         }
 934
 935         spin_unlock_irqrestore(&self->spinlock, flags);
 936 }
 937
 938 /*
 939  * Function ircomm_tty_hangup (tty)
 940  *
 941  *    This routine notifies the tty driver that it should hangup the tty
 942  *    device.
 943  *
 944  */
 945 static void ircomm_tty_hangup(struct tty_struct *tty)
 946 {
 947         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 948         struct tty_port *port = &self->port;
 949         unsigned long   flags;
 950
 951         IRDA_ASSERT(self != NULL, return;);
 952         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 953
 954         /* ircomm_tty_flush_buffer(tty); */
 955         ircomm_tty_shutdown(self);
 956
 957         spin_lock_irqsave(&port->lock, flags);
 958         port->flags &= ~ASYNC_NORMAL_ACTIVE;
 959         if (port->tty) {
 960                 set_bit(TTY_IO_ERROR, &port->tty->flags);
 961                 tty_kref_put(port->tty);
 962         }
 963         port->tty = NULL;
 964         port->count = 0;
 965         spin_unlock_irqrestore(&port->lock, flags);
 966
 967         wake_up_interruptible(&port->open_wait);
 968 }
 969
 970 /*
 971  * Function ircomm_tty_send_xchar (tty, ch)
 972  *
 973  *    This routine is used to send a high-priority XON/XOFF character to
 974  *    the device.
 975  */
 976 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
 977 {
 978         pr_debug("%s(), not impl\n", __func__);
 979 }
 980
 981 /*
 982  * Function ircomm_tty_start (tty)
 983  *
 984  *    This routine notifies the tty driver that it resume sending
 985  *    characters to the tty device.
 986  */
 987 void ircomm_tty_start(struct tty_struct *tty)
 988 {
 989         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 990
 991         ircomm_flow_request(self->ircomm, FLOW_START);
 992 }
 993
 994 /*
 995  * Function ircomm_tty_stop (tty)
 996  *
 997  *     This routine notifies the tty driver that it should stop outputting
 998  *     characters to the tty device.
 999  */
1000 static void ircomm_tty_stop(struct tty_struct *tty)
1001 {
1002         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1003
1004         IRDA_ASSERT(self != NULL, return;);
1005         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1006
1007         ircomm_flow_request(self->ircomm, FLOW_STOP);
1008 }
1009
1010 /*
1011  * Function ircomm_check_modem_status (self)
1012  *
1013  *    Check for any changes in the DCE's line settings. This function should
1014  *    be called whenever the dce parameter settings changes, to update the
1015  *    flow control settings and other things
1016  */
1017 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1018 {
1019         struct tty_struct *tty;
1020         int status;
1021
1022         IRDA_ASSERT(self != NULL, return;);
1023         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1024
1025         tty = tty_port_tty_get(&self->port);
1026
1027         status = self->settings.dce;
1028
1029         if (status & IRCOMM_DCE_DELTA_ANY) {
1030                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1031         }
1032         if ((self->port.flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1033                 pr_debug("%s(), ircomm%d CD now %s...\n", __func__ , self->line,
1034                          (status & IRCOMM_CD) ? "on" : "off");
1035
1036                 if (status & IRCOMM_CD) {
1037                         wake_up_interruptible(&self->port.open_wait);
1038                 } else {
1039                         pr_debug("%s(), Doing serial hangup..\n", __func__);
1040                         if (tty)
1041                                 tty_hangup(tty);
1042
1043                         /* Hangup will remote the tty, so better break out */
1044                         goto put;
1045                 }
1046         }
1047         if (tty && tty_port_cts_enabled(&self->port)) {
1048                 if (tty->hw_stopped) {
1049                         if (status & IRCOMM_CTS) {
1050                                 pr_debug("%s(), CTS tx start...\n", __func__);
1051                                 tty->hw_stopped = 0;
1052
1053                                 /* Wake up processes blocked on open */
1054                                 wake_up_interruptible(&self->port.open_wait);
1055
1056                                 schedule_work(&self->tqueue);
1057                                 goto put;
1058                         }
1059                 } else {
1060                         if (!(status & IRCOMM_CTS)) {
1061                                 pr_debug("%s(), CTS tx stop...\n", __func__);
1062                                 tty->hw_stopped = 1;
1063                         }
1064                 }
1065         }
1066 put:
1067         tty_kref_put(tty);
1068 }
1069
1070 /*
1071  * Function ircomm_tty_data_indication (instance, sap, skb)
1072  *
1073  *    Handle incoming data, and deliver it to the line discipline
1074  *
1075  */
1076 static int ircomm_tty_data_indication(void *instance, void *sap,
1077                                       struct sk_buff *skb)
1078 {
1079         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1080         struct tty_struct *tty;
1081
1082         IRDA_ASSERT(self != NULL, return -1;);
1083         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1084         IRDA_ASSERT(skb != NULL, return -1;);
1085
1086         tty = tty_port_tty_get(&self->port);
1087         if (!tty) {
1088                 pr_debug("%s(), no tty!\n", __func__);
1089                 return 0;
1090         }
1091
1092         /*
1093          * If we receive data when hardware is stopped then something is wrong.
1094          * We try to poll the peers line settings to check if we are up todate.
1095          * Devices like WinCE can do this, and since they don't send any
1096          * params, we can just as well declare the hardware for running.
1097          */
1098         if (tty->hw_stopped && (self->flow == FLOW_START)) {
1099                 pr_debug("%s(), polling for line settings!\n", __func__);
1100                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1101
1102                 /* We can just as well declare the hardware for running */
1103                 ircomm_tty_send_initial_parameters(self);
1104                 ircomm_tty_link_established(self);
1105         }
1106         tty_kref_put(tty);
1107
1108         /*
1109          * Use flip buffer functions since the code may be called from interrupt
1110          * context
1111          */
1112         tty_insert_flip_string(&self->port, skb->data, skb->len);
1113         tty_flip_buffer_push(&self->port);
1114
1115         /* No need to kfree_skb - see ircomm_ttp_data_indication() */
1116
1117         return 0;
1118 }
1119
1120 /*
1121  * Function ircomm_tty_control_indication (instance, sap, skb)
1122  *
1123  *    Parse all incoming parameters (easy!)
1124  *
1125  */
1126 static int ircomm_tty_control_indication(void *instance, void *sap,
1127                                          struct sk_buff *skb)
1128 {
1129         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1130         int clen;
1131
1132         IRDA_ASSERT(self != NULL, return -1;);
1133         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1134         IRDA_ASSERT(skb != NULL, return -1;);
1135
1136         clen = skb->data[0];
1137
1138         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1139                                &ircomm_param_info);
1140
1141         /* No need to kfree_skb - see ircomm_control_indication() */
1142
1143         return 0;
1144 }
1145
1146 /*
1147  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1148  *
1149  *    This function is called by IrTTP when it wants us to slow down the
1150  *    transmission of data. We just mark the hardware as stopped, and wait
1151  *    for IrTTP to notify us that things are OK again.
1152  */
1153 static void ircomm_tty_flow_indication(void *instance, void *sap,
1154                                        LOCAL_FLOW cmd)
1155 {
1156         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1157         struct tty_struct *tty;
1158
1159         IRDA_ASSERT(self != NULL, return;);
1160         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1161
1162         tty = tty_port_tty_get(&self->port);
1163
1164         switch (cmd) {
1165         case FLOW_START:
1166                 pr_debug("%s(), hw start!\n", __func__);
1167                 if (tty)
1168                         tty->hw_stopped = 0;
1169
1170                 /* ircomm_tty_do_softint will take care of the rest */
1171                 schedule_work(&self->tqueue);
1172                 break;
1173         default:  /* If we get here, something is very wrong, better stop */
1174         case FLOW_STOP:
1175                 pr_debug("%s(), hw stopped!\n", __func__);
1176                 if (tty)
1177                         tty->hw_stopped = 1;
1178                 break;
1179         }
1180
1181         tty_kref_put(tty);
1182         self->flow = cmd;
1183 }
1184
1185 #ifdef CONFIG_PROC_FS
1186 static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
1187 {
1188         struct tty_struct *tty;
1189         char sep;
1190
1191         seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
1192
1193         seq_puts(m, "Service type: ");
1194         if (self->service_type & IRCOMM_9_WIRE)
1195                 seq_puts(m, "9_WIRE");
1196         else if (self->service_type & IRCOMM_3_WIRE)
1197                 seq_puts(m, "3_WIRE");
1198         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1199                 seq_puts(m, "3_WIRE_RAW");
1200         else
1201                 seq_puts(m, "No common service type!\n");
1202         seq_putc(m, '\n');
1203
1204         seq_printf(m, "Port name: %s\n", self->settings.port_name);
1205
1206         seq_printf(m, "DTE status:");
1207         sep = ' ';
1208         if (self->settings.dte & IRCOMM_RTS) {
1209                 seq_printf(m, "%cRTS", sep);
1210                 sep = '|';
1211         }
1212         if (self->settings.dte & IRCOMM_DTR) {
1213                 seq_printf(m, "%cDTR", sep);
1214                 sep = '|';
1215         }
1216         seq_putc(m, '\n');
1217
1218         seq_puts(m, "DCE status:");
1219         sep = ' ';
1220         if (self->settings.dce & IRCOMM_CTS) {
1221                 seq_printf(m, "%cCTS", sep);
1222                 sep = '|';
1223         }
1224         if (self->settings.dce & IRCOMM_DSR) {
1225                 seq_printf(m, "%cDSR", sep);
1226                 sep = '|';
1227         }
1228         if (self->settings.dce & IRCOMM_CD) {
1229                 seq_printf(m, "%cCD", sep);
1230                 sep = '|';
1231         }
1232         if (self->settings.dce & IRCOMM_RI) {
1233                 seq_printf(m, "%cRI", sep);
1234                 sep = '|';
1235         }
1236         seq_putc(m, '\n');
1237
1238         seq_puts(m, "Configuration: ");
1239         if (!self->settings.null_modem)
1240                 seq_puts(m, "DTE <-> DCE\n");
1241         else
1242                 seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
1243
1244         seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
1245
1246         seq_puts(m, "Flow control:");
1247         sep = ' ';
1248         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
1249                 seq_printf(m, "%cXON_XOFF_IN", sep);
1250                 sep = '|';
1251         }
1252         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
1253                 seq_printf(m, "%cXON_XOFF_OUT", sep);
1254                 sep = '|';
1255         }
1256         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
1257                 seq_printf(m, "%cRTS_CTS_IN", sep);
1258                 sep = '|';
1259         }
1260         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
1261                 seq_printf(m, "%cRTS_CTS_OUT", sep);
1262                 sep = '|';
1263         }
1264         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
1265                 seq_printf(m, "%cDSR_DTR_IN", sep);
1266                 sep = '|';
1267         }
1268         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
1269                 seq_printf(m, "%cDSR_DTR_OUT", sep);
1270                 sep = '|';
1271         }
1272         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
1273                 seq_printf(m, "%cENQ_ACK_IN", sep);
1274                 sep = '|';
1275         }
1276         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
1277                 seq_printf(m, "%cENQ_ACK_OUT", sep);
1278                 sep = '|';
1279         }
1280         seq_putc(m, '\n');
1281
1282         seq_puts(m, "Flags:");
1283         sep = ' ';
1284         if (tty_port_cts_enabled(&self->port)) {
1285                 seq_printf(m, "%cASYNC_CTS_FLOW", sep);
1286                 sep = '|';
1287         }
1288         if (self->port.flags & ASYNC_CHECK_CD) {
1289                 seq_printf(m, "%cASYNC_CHECK_CD", sep);
1290                 sep = '|';
1291         }
1292         if (self->port.flags & ASYNC_INITIALIZED) {
1293                 seq_printf(m, "%cASYNC_INITIALIZED", sep);
1294                 sep = '|';
1295         }
1296         if (self->port.flags & ASYNC_LOW_LATENCY) {
1297                 seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
1298                 sep = '|';
1299         }
1300         if (self->port.flags & ASYNC_CLOSING) {
1301                 seq_printf(m, "%cASYNC_CLOSING", sep);
1302                 sep = '|';
1303         }
1304         if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
1305                 seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
1306                 sep = '|';
1307         }
1308         seq_putc(m, '\n');
1309
1310         seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
1311         seq_printf(m, "Open count: %d\n", self->port.count);
1312         seq_printf(m, "Max data size: %d\n", self->max_data_size);
1313         seq_printf(m, "Max header size: %d\n", self->max_header_size);
1314
1315         tty = tty_port_tty_get(&self->port);
1316         if (tty) {
1317                 seq_printf(m, "Hardware: %s\n",
1318                                tty->hw_stopped ? "Stopped" : "Running");
1319                 tty_kref_put(tty);
1320         }
1321 }
1322
1323 static int ircomm_tty_proc_show(struct seq_file *m, void *v)
1324 {
1325         struct ircomm_tty_cb *self;
1326         unsigned long flags;
1327
1328         spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
1329
1330         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1331         while (self != NULL) {
1332                 if (self->magic != IRCOMM_TTY_MAGIC)
1333                         break;
1334
1335                 ircomm_tty_line_info(self, m);
1336                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1337         }
1338         spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
1339         return 0;
1340 }
1341
1342 static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
1343 {
1344         return single_open(file, ircomm_tty_proc_show, NULL);
1345 }
1346
1347 static const struct file_operations ircomm_tty_proc_fops = {
1348         .owner          = THIS_MODULE,
1349         .open           = ircomm_tty_proc_open,
1350         .read           = seq_read,
1351         .llseek         = seq_lseek,
1352         .release        = single_release,
1353 };
1354 #endif /* CONFIG_PROC_FS */
1355
1356 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1357 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1358 MODULE_LICENSE("GPL");
1359 MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
1360
1361 module_init(ircomm_tty_init);
1362 module_exit(ircomm_tty_cleanup);