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  *
  15  *     This program is free software; you can redistribute it and/or
  16  *     modify it under the terms of the GNU General Public License as
  17  *     published by the Free Software Foundation; either version 2 of
  18  *     the License, or (at your option) any later version.
  19  *
  20  *     This program is distributed in the hope that it will be useful,
  21  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  *     GNU General Public License for more details.
  24  *
  25  *     You should have received a copy of the GNU General Public License
  26  *     along with this program; if not, write to the Free Software
  27  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *     MA 02111-1307 USA
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/config.h>
  33 #include <linux/init.h>
  34 #include <linux/module.h>
  35 #include <linux/fs.h>
  36 #include <linux/sched.h>
  37 #include <linux/termios.h>
  38 #include <linux/tty.h>
  39 #include <linux/interrupt.h>
  40
  41 #include <asm/segment.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <net/irda/irda.h>
  45 #include <net/irda/irmod.h>
  46
  47 #include <net/irda/ircomm_core.h>
  48 #include <net/irda/ircomm_param.h>
  49 #include <net/irda/ircomm_tty_attach.h>
  50 #include <net/irda/ircomm_tty.h>
  51
  52 static int  ircomm_tty_open(struct tty_struct *tty, struct file *filp);
  53 static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
  54 static int  ircomm_tty_write(struct tty_struct * tty, int from_user,
  55                              const unsigned char *buf, int count);
  56 static int  ircomm_tty_write_room(struct tty_struct *tty);
  57 static void ircomm_tty_throttle(struct tty_struct *tty);
  58 static void ircomm_tty_unthrottle(struct tty_struct *tty);
  59 static int  ircomm_tty_chars_in_buffer(struct tty_struct *tty);
  60 static void ircomm_tty_flush_buffer(struct tty_struct *tty);
  61 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
  62 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
  63 static void ircomm_tty_hangup(struct tty_struct *tty);
  64 static void ircomm_tty_do_softint(void *private_);
  65 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
  66
  67 static int ircomm_tty_data_indication(void *instance, void *sap,
  68                                       struct sk_buff *skb);
  69 static int ircomm_tty_control_indication(void *instance, void *sap,
  70                                          struct sk_buff *skb);
  71 static void ircomm_tty_flow_indication(void *instance, void *sap,
  72                                        LOCAL_FLOW cmd);
  73 #ifdef CONFIG_PROC_FS
  74 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
  75                                 int *eof, void *unused);
  76 #endif /* CONFIG_PROC_FS */
  77 static struct tty_driver driver;
  78 static int ircomm_tty_refcount;       /* If we manage several devices */
  79
  80 static struct tty_struct *ircomm_tty_table[NR_PTYS];
  81 static struct termios *ircomm_tty_termios[NR_PTYS];
  82 static struct termios *ircomm_tty_termios_locked[NR_PTYS];
  83
  84 hashbin_t *ircomm_tty = NULL;
  85
  86 /*
  87  * Function ircomm_tty_init()
  88  *
  89  *    Init IrCOMM TTY layer/driver
  90  *
  91  */
  92 int __init ircomm_tty_init(void)
  93 {
  94         ircomm_tty = hashbin_new(HB_LOCAL);
  95         if (ircomm_tty == NULL) {
  96                 ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
  97                 return -ENOMEM;
  98         }
  99
 100         memset(&driver, 0, sizeof(struct tty_driver));
 101         driver.magic           = TTY_DRIVER_MAGIC;
 102         driver.driver_name     = "ircomm";
 103 #ifdef CONFIG_DEVFS_FS
 104         driver.name            = "ircomm%d";
 105 #else
 106         driver.name            = "ircomm";
 107 #endif
 108         driver.major           = IRCOMM_TTY_MAJOR;
 109         driver.minor_start     = IRCOMM_TTY_MINOR;
 110         driver.num             = IRCOMM_TTY_PORTS;
 111         driver.type            = TTY_DRIVER_TYPE_SERIAL;
 112         driver.subtype         = SERIAL_TYPE_NORMAL;
 113         driver.init_termios    = tty_std_termios;
 114         driver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 115         driver.flags           = TTY_DRIVER_REAL_RAW;
 116         driver.refcount        = &ircomm_tty_refcount;
 117         driver.table           = ircomm_tty_table;
 118         driver.termios         = ircomm_tty_termios;
 119         driver.termios_locked  = ircomm_tty_termios_locked;
 120         driver.open            = ircomm_tty_open;
 121         driver.close           = ircomm_tty_close;
 122         driver.write           = ircomm_tty_write;
 123         driver.write_room      = ircomm_tty_write_room;
 124         driver.chars_in_buffer = ircomm_tty_chars_in_buffer;
 125         driver.flush_buffer    = ircomm_tty_flush_buffer;
 126         driver.ioctl           = ircomm_tty_ioctl;
 127         driver.throttle        = ircomm_tty_throttle;
 128         driver.unthrottle      = ircomm_tty_unthrottle;
 129         driver.send_xchar      = ircomm_tty_send_xchar;
 130         driver.set_termios     = ircomm_tty_set_termios;
 131         driver.stop            = ircomm_tty_stop;
 132         driver.start           = ircomm_tty_start;
 133         driver.hangup          = ircomm_tty_hangup;
 134         driver.wait_until_sent = ircomm_tty_wait_until_sent;
 135 #ifdef CONFIG_PROC_FS
 136         driver.read_proc       = ircomm_tty_read_proc;
 137 #endif /* CONFIG_PROC_FS */
 138         if (tty_register_driver(&driver)) {
 139                 ERROR("%s: Couldn't register serial driver\n", __FUNCTION__);
 140                 return -1;
 141         }
 142         return 0;
 143 }
 144
 145 #ifdef MODULE
 146 static void __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
 147 {
 148         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
 149
 150         ASSERT(self != NULL, return;);
 151         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 152
 153         ircomm_tty_shutdown(self);
 154
 155         self->magic = 0;
 156         kfree(self);
 157 }
 158
 159 /*
 160  * Function ircomm_tty_cleanup ()
 161  *
 162  *    Remove IrCOMM TTY layer/driver
 163  *
 164  */
 165 void ircomm_tty_cleanup(void)
 166 {
 167         int ret;
 168
 169         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 170
 171         ret = tty_unregister_driver(&driver);
 172         if (ret) {
 173                 ERROR("%s, failed to unregister driver\n", __FUNCTION__);
 174                 return;
 175         }
 176
 177         hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
 178 }
 179 #endif /* MODULE */
 180
 181 /*
 182  * Function ircomm_startup (self)
 183  *
 184  *
 185  *
 186  */
 187 static int ircomm_tty_startup(struct ircomm_tty_cb *self)
 188 {
 189         notify_t notify;
 190         int ret;
 191
 192         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 193
 194         ASSERT(self != NULL, return -1;);
 195         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 196
 197         /* Already open */
 198         if (self->flags & ASYNC_INITIALIZED) {
 199                 IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__);
 200                 return 0;
 201         }
 202
 203         /* Register with IrCOMM */
 204         irda_notify_init(&notify);
 205         /* These callbacks we must handle ourselves */
 206         notify.data_indication       = ircomm_tty_data_indication;
 207         notify.udata_indication      = ircomm_tty_control_indication;
 208         notify.flow_indication       = ircomm_tty_flow_indication;
 209
 210         /* Use the ircomm_tty interface for these ones */
 211         notify.disconnect_indication = ircomm_tty_disconnect_indication;
 212         notify.connect_confirm       = ircomm_tty_connect_confirm;
 213         notify.connect_indication    = ircomm_tty_connect_indication;
 214         strncpy(notify.name, "ircomm_tty", NOTIFY_MAX_NAME);
 215         notify.instance = self;
 216
 217         if (!self->ircomm) {
 218                 self->ircomm = ircomm_open(&notify, self->service_type,
 219                                            self->line);
 220         }
 221         if (!self->ircomm)
 222                 return -ENODEV;
 223
 224         self->slsap_sel = self->ircomm->slsap_sel;
 225
 226         /* Connect IrCOMM link with remote device */
 227         ret = ircomm_tty_attach_cable(self);
 228         if (ret < 0) {
 229                 ERROR("%s(), error attaching cable!\n", __FUNCTION__);
 230                 return ret;
 231         }
 232
 233         self->flags |= ASYNC_INITIALIZED;
 234
 235         return 0;
 236 }
 237
 238 /*
 239  * Function ircomm_block_til_ready (self, filp)
 240  *
 241  *
 242  *
 243  */
 244 static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 245                                       struct file *filp)
 246 {
 247         DECLARE_WAITQUEUE(wait, current);
 248         int             retval;
 249         int             do_clocal = 0, extra_count = 0;
 250         unsigned long   flags;
 251         struct tty_struct *tty;
 252
 253         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 254
 255         tty = self->tty;
 256
 257         if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
 258                 /* this is a callout device */
 259                 /* just verify that normal device is not in use */
 260                 if (self->flags & ASYNC_NORMAL_ACTIVE)
 261                         return -EBUSY;
 262                 if ((self->flags & ASYNC_CALLOUT_ACTIVE) &&
 263                     (self->flags & ASYNC_SESSION_LOCKOUT) &&
 264                     (self->session != current->session))
 265                         return -EBUSY;
 266                 if ((self->flags & ASYNC_CALLOUT_ACTIVE) &&
 267                     (self->flags & ASYNC_PGRP_LOCKOUT) &&
 268                     (self->pgrp != current->pgrp))
 269                         return -EBUSY;
 270                 self->flags |= ASYNC_CALLOUT_ACTIVE;
 271                 return 0;
 272         }
 273
 274         /*
 275          * If non-blocking mode is set, or the port is not enabled,
 276          * then make the check up front and then exit.
 277          */
 278         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
 279                 /* nonblock mode is set or port is not enabled */
 280                 /* just verify that callout device is not active */
 281                 if (self->flags & ASYNC_CALLOUT_ACTIVE)
 282                         return -EBUSY;
 283                 self->flags |= ASYNC_NORMAL_ACTIVE;
 284
 285                 IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__);
 286                 return 0;
 287         }
 288
 289         if (self->flags & ASYNC_CALLOUT_ACTIVE) {
 290                 if (self->normal_termios.c_cflag & CLOCAL) {
 291                         IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__);
 292                         do_clocal = 1;
 293                 }
 294         } else {
 295                 if (tty->termios->c_cflag & CLOCAL) {
 296                         IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__);
 297                         do_clocal = 1;
 298                 }
 299         }
 300
 301         /* Wait for carrier detect and the line to become
 302          * free (i.e., not in use by the callout).  While we are in
 303          * this loop, self->open_count is dropped by one, so that
 304          * mgsl_close() knows when to free things.  We restore it upon
 305          * exit, either normal or abnormal.
 306          */
 307
 308         retval = 0;
 309         add_wait_queue(&self->open_wait, &wait);
 310
 311         IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
 312               __FILE__,__LINE__, tty->driver.name, self->open_count );
 313
 314         save_flags(flags); cli();
 315         if (!tty_hung_up_p(filp)) {
 316                 extra_count = 1;
 317                 self->open_count--;
 318         }
 319         restore_flags(flags);
 320         self->blocked_open++;
 321
 322         while (1) {
 323                 if (!(self->flags & ASYNC_CALLOUT_ACTIVE) &&
 324                     (tty->termios->c_cflag & CBAUD)) {
 325                         save_flags(flags); cli();
 326                         self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
 327
 328                         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 329                         restore_flags(flags);
 330                 }
 331
 332                 current->state = TASK_INTERRUPTIBLE;
 333
 334                 if (tty_hung_up_p(filp) || !(self->flags & ASYNC_INITIALIZED)){
 335                         retval = (self->flags & ASYNC_HUP_NOTIFY) ?
 336                                         -EAGAIN : -ERESTARTSYS;
 337                         break;
 338                 }
 339
 340                 /*
 341                  * Check if link is ready now. Even if CLOCAL is
 342                  * specified, we cannot return before the IrCOMM link is
 343                  * ready
 344                  */
 345                 if (!(self->flags & ASYNC_CALLOUT_ACTIVE) &&
 346                     !(self->flags & ASYNC_CLOSING) &&
 347                     (do_clocal || (self->settings.dce & IRCOMM_CD)) &&
 348                     self->state == IRCOMM_TTY_READY)
 349                 {
 350                         break;
 351                 }
 352
 353                 if (signal_pending(current)) {
 354                         retval = -ERESTARTSYS;
 355                         break;
 356                 }
 357
 358                 IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
 359                       __FILE__,__LINE__, tty->driver.name, self->open_count );
 360
 361                 schedule();
 362         }
 363
 364         __set_current_state(TASK_RUNNING);
 365         remove_wait_queue(&self->open_wait, &wait);
 366
 367         if (extra_count)
 368                 self->open_count++;
 369         self->blocked_open--;
 370
 371         IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
 372               __FILE__,__LINE__, tty->driver.name, self->open_count);
 373
 374         if (!retval)
 375                 self->flags |= ASYNC_NORMAL_ACTIVE;
 376
 377         return retval;
 378 }
 379
 380 /*
 381  * Function ircomm_tty_open (tty, filp)
 382  *
 383  *    This routine is called when a particular tty device is opened. This
 384  *    routine is mandatory; if this routine is not filled in, the attempted
 385  *    open will fail with ENODEV.
 386  */
 387 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 388 {
 389         struct ircomm_tty_cb *self;
 390         int line;
 391         int ret;
 392
 393         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 394
 395         MOD_INC_USE_COUNT;
 396         line = MINOR(tty->device) - tty->driver.minor_start;
 397         if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) {
 398                 MOD_DEC_USE_COUNT;
 399                 return -ENODEV;
 400         }
 401
 402         /* Check if instance already exists */
 403         self = hashbin_find(ircomm_tty, line, NULL);
 404         if (!self) {
 405                 /* No, so make new instance */
 406                 self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
 407                 if (self == NULL) {
 408                         ERROR("%s(), kmalloc failed!\n", __FUNCTION__);
 409                         MOD_DEC_USE_COUNT;
 410                         return -ENOMEM;
 411                 }
 412                 memset(self, 0, sizeof(struct ircomm_tty_cb));
 413
 414                 self->magic = IRCOMM_TTY_MAGIC;
 415                 self->flow = FLOW_STOP;
 416
 417                 self->line = line;
 418                 self->tqueue.routine = ircomm_tty_do_softint;
 419                 self->tqueue.data = self;
 420                 self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
 421                 self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
 422                 self->close_delay = 5*HZ/10;
 423                 self->closing_wait = 30*HZ;
 424
 425                 /* Init some important stuff */
 426                 init_timer(&self->watchdog_timer);
 427                 init_waitqueue_head(&self->open_wait);
 428                 init_waitqueue_head(&self->close_wait);
 429
 430                 /*
 431                  * Force TTY into raw mode by default which is usually what
 432                  * we want for IrCOMM and IrLPT. This way applications will
 433                  * not have to twiddle with printcap etc.
 434                  */
 435                 tty->termios->c_iflag = 0;
 436                 tty->termios->c_oflag = 0;
 437
 438                 /* Insert into hash */
 439                 hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
 440         }
 441         self->open_count++;
 442
 443         tty->driver_data = self;
 444         self->tty = tty;
 445
 446         IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__,
 447                 tty->driver.name, self->line, self->open_count);
 448
 449         /* Not really used by us, but lets do it anyway */
 450         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 451
 452         /*
 453          * If the port is the middle of closing, bail out now
 454          */
 455         if (tty_hung_up_p(filp) ||
 456             (self->flags & ASYNC_CLOSING)) {
 457                 if (self->flags & ASYNC_CLOSING)
 458                         interruptible_sleep_on(&self->close_wait);
 459                 /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */
 460 #ifdef SERIAL_DO_RESTART
 461                 return ((self->flags & ASYNC_HUP_NOTIFY) ?
 462                         -EAGAIN : -ERESTARTSYS);
 463 #else
 464                 return -EAGAIN;
 465 #endif
 466         }
 467
 468         /* Check if this is a "normal" ircomm device, or an irlpt device */
 469         if (line < 0x10) {
 470                 self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
 471                 self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
 472                 self->settings.dce = IRCOMM_CTS | IRCOMM_CD; /* Default line settings */
 473                 IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__);
 474         } else {
 475                 IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__);
 476                 self->service_type = IRCOMM_3_WIRE_RAW;
 477                 self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
 478         }
 479
 480         ret = ircomm_tty_startup(self);
 481         if (ret)
 482                 return ret;
 483
 484         ret = ircomm_tty_block_til_ready(self, filp);
 485         if (ret) {
 486                 /* MOD_DEC_USE_COUNT; "info->tty" will cause this? */
 487                 IRDA_DEBUG(2, "%s(), returning after block_til_ready with %d\n",
 488                         __FUNCTION__, ret);
 489
 490                 return ret;
 491         }
 492
 493         self->session = current->session;
 494         self->pgrp = current->pgrp;
 495
 496         return 0;
 497 }
 498
 499 /*
 500  * Function ircomm_tty_close (tty, filp)
 501  *
 502  *    This routine is called when a particular tty device is closed.
 503  *
 504  */
 505 static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
 506 {
 507         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 508         unsigned long flags;
 509
 510         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
 511
 512         if (!tty)
 513                 return;
 514
 515         ASSERT(self != NULL, return;);
 516         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 517
 518         save_flags(flags);
 519         cli();
 520
 521         if (tty_hung_up_p(filp)) {
 522                 MOD_DEC_USE_COUNT;
 523                 restore_flags(flags);
 524
 525                 IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__);
 526                 return;
 527         }
 528
 529         if ((tty->count == 1) && (self->open_count != 1)) {
 530                 /*
 531                  * Uh, oh.  tty->count is 1, which means that the tty
 532                  * structure will be freed.  state->count should always
 533                  * be one in these conditions.  If it's greater than
 534                  * one, we've got real problems, since it means the
 535                  * serial port won't be shutdown.
 536                  */
 537                 IRDA_DEBUG(0, "%s(), bad serial port count; "
 538                            "tty->count is 1, state->count is %d\n",
 539                            __FUNCTION__, self->open_count);
 540                 self->open_count = 1;
 541         }
 542
 543         if (--self->open_count < 0) {
 544                 ERROR("%s(), bad serial port count for ttys%d: %d\n",
 545                         __FUNCTION__, self->line, self->open_count);
 546                 self->open_count = 0;
 547         }
 548         if (self->open_count) {
 549                 MOD_DEC_USE_COUNT;
 550                 restore_flags(flags);
 551
 552                 IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__);
 553                 return;
 554         }
 555         self->flags |= ASYNC_CLOSING;
 556
 557         /*
 558          * Now we wait for the transmit buffer to clear; and we notify
 559          * the line discipline to only process XON/XOFF characters.
 560          */
 561         tty->closing = 1;
 562         if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
 563                 tty_wait_until_sent(tty, self->closing_wait);
 564
 565         ircomm_tty_shutdown(self);
 566
 567         if (tty->driver.flush_buffer)
 568                 tty->driver.flush_buffer(tty);
 569         tty_ldisc_flush(tty);
 570
 571         tty->closing = 0;
 572         self->tty = 0;
 573
 574         if (self->blocked_open) {
 575                 if (self->close_delay) {
 576                         current->state = TASK_INTERRUPTIBLE;
 577                         schedule_timeout(self->close_delay);
 578                 }
 579                 wake_up_interruptible(&self->open_wait);
 580         }
 581
 582         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
 583                          ASYNC_CLOSING);
 584         wake_up_interruptible(&self->close_wait);
 585
 586         MOD_DEC_USE_COUNT;
 587         restore_flags(flags);
 588 }
 589
 590 /*
 591  * Function ircomm_tty_flush_buffer (tty)
 592  *
 593  *
 594  *
 595  */
 596 static void ircomm_tty_flush_buffer(struct tty_struct *tty)
 597 {
 598         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 599
 600         ASSERT(self != NULL, return;);
 601         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 602
 603         /*
 604          * Let do_softint() do this to avoid race condition with
 605          * do_softint() ;-)
 606          */
 607         queue_task(&self->tqueue, &tq_immediate);
 608         mark_bh(IMMEDIATE_BH);
 609 }
 610
 611 /*
 612  * Function ircomm_tty_do_softint (private_)
 613  *
 614  *    We use this routine to give the write wakeup to the user at at a
 615  *    safe time (as fast as possible after write have completed). This
 616  *    can be compared to the Tx interrupt.
 617  */
 618 static void ircomm_tty_do_softint(void *private_)
 619 {
 620         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_;
 621         struct tty_struct *tty;
 622         unsigned long flags;
 623         struct sk_buff *skb, *ctrl_skb;
 624
 625         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 626
 627         if (!self || self->magic != IRCOMM_TTY_MAGIC)
 628                 return;
 629
 630         tty = self->tty;
 631         if (!tty)
 632                 return;
 633
 634         /* Unlink control buffer */
 635         save_flags(flags);
 636         cli();
 637
 638         ctrl_skb = self->ctrl_skb;
 639         self->ctrl_skb = NULL;
 640
 641         restore_flags(flags);
 642
 643         /* Flush control buffer if any */
 644         if (ctrl_skb && self->flow == FLOW_START)
 645                 ircomm_control_request(self->ircomm, ctrl_skb);
 646
 647         if (tty->hw_stopped)
 648                 return;
 649
 650         /* Unlink transmit buffer */
 651         save_flags(flags);
 652         cli();
 653
 654         skb = self->tx_skb;
 655         self->tx_skb = NULL;
 656
 657         restore_flags(flags);
 658
 659         /* Flush transmit buffer if any */
 660         if (skb)
 661                 ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
 662
 663         /* Check if user (still) wants to be waken up */
 664         tty_wakeup(tty);
 665 }
 666
 667 /*
 668  * Function ircomm_tty_write (tty, from_user, buf, count)
 669  *
 670  *    This routine is called by the kernel to write a series of characters
 671  *    to the tty device. The characters may come from user space or kernel
 672  *    space. This routine will return the number of characters actually
 673  *    accepted for writing. This routine is mandatory.
 674  */
 675 static int ircomm_tty_write(struct tty_struct *tty, int from_user,
 676                             const unsigned char *buf, int count)
 677 {
 678         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 679         unsigned long flags;
 680         struct sk_buff *skb;
 681         int tailroom = 0;
 682         int len = 0;
 683         int size;
 684
 685         IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n",
 686                 __FUNCTION__, count, tty->hw_stopped);
 687
 688         ASSERT(self != NULL, return -1;);
 689         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 690
 691         /* We may receive packets from the TTY even before we have finished
 692          * our setup. Not cool.
 693          * The problem is that we don't know the final header and data size
 694          * to create the proper skb, so any skb we would create would have
 695          * bogus header and data size, so need care.
 696          * We use a bogus header size to safely detect this condition.
 697          * Another problem is that hw_stopped was set to 0 way before it
 698          * should be, so we would drop this skb. It should now be fixed.
 699          * One option is to not accept data until we are properly setup.
 700          * But, I suspect that when it happens, the ppp line discipline
 701          * just "drops" the data, which might screw up connect scripts.
 702          * The second option is to create a "safe skb", with large header
 703          * and small size (see ircomm_tty_open() for values).
 704          * We just need to make sure that when the real values get filled,
 705          * we don't mess up the original "safe skb" (see tx_data_size).
 706          * Jean II */
 707         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
 708                 IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__);
 709 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 710                 /* We didn't consume anything, TTY will retry */
 711                 return 0;
 712 #endif
 713         }
 714
 715         save_flags(flags);
 716         cli();
 717
 718         /* Fetch current transmit buffer */
 719         skb = self->tx_skb;
 720
 721         /*
 722          * Send out all the data we get, possibly as multiple fragmented
 723          * frames, but this will only happen if the data is larger than the
 724          * max data size. The normal case however is just the opposite, and
 725          * this function may be called multiple times, and will then actually
 726          * defragment the data and send it out as one packet as soon as
 727          * possible, but at a safer point in time
 728          */
 729         while (count) {
 730                 size = count;
 731
 732                 /* Adjust data size to the max data size */
 733                 if (size > self->max_data_size)
 734                         size = self->max_data_size;
 735
 736                 /*
 737                  * Do we already have a buffer ready for transmit, or do
 738                  * we need to allocate a new frame
 739                  */
 740                 if (skb) {
 741                         /*
 742                          * Any room for more data at the end of the current
 743                          * transmit buffer? Cannot use skb_tailroom, since
 744                          * dev_alloc_skb gives us a larger skb than we
 745                          * requested
 746                          * Note : use tx_data_size, because max_data_size
 747                          * may have changed and we don't want to overwrite
 748                          * the skb. - Jean II
 749                          */
 750                         if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
 751                                 /* Adjust data to tailroom */
 752                                 if (size > tailroom)
 753                                         size = tailroom;
 754                         } else {
 755                                 /*
 756                                  * Current transmit frame is full, so break
 757                                  * out, so we can send it as soon as possible
 758                                  */
 759                                 break;
 760                         }
 761                 } else {
 762                         /* Prepare a full sized frame */
 763                         skb = dev_alloc_skb(self->max_data_size+
 764                                             self->max_header_size);
 765                         if (!skb) {
 766                                 restore_flags(flags);
 767                                 return -ENOBUFS;
 768                         }
 769                         skb_reserve(skb, self->max_header_size);
 770                         self->tx_skb = skb;
 771                         /* Remember skb size because max_data_size may
 772                          * change later on - Jean II */
 773                         self->tx_data_size = self->max_data_size;
 774                 }
 775
 776                 /* Copy data */
 777                 if (from_user)
 778                         copy_from_user(skb_put(skb,size), buf+len, size);
 779                 else
 780                         memcpy(skb_put(skb,size), buf+len, size);
 781
 782                 count -= size;
 783                 len += size;
 784         }
 785
 786         restore_flags(flags);
 787
 788         /*
 789          * Schedule a new thread which will transmit the frame as soon
 790          * as possible, but at a safe point in time. We do this so the
 791          * "user" can give us data multiple times, as PPP does (because of
 792          * its 256 byte tx buffer). We will then defragment and send out
 793          * all this data as one single packet.
 794          */
 795         queue_task(&self->tqueue, &tq_immediate);
 796         mark_bh(IMMEDIATE_BH);
 797
 798         return len;
 799 }
 800
 801 /*
 802  * Function ircomm_tty_write_room (tty)
 803  *
 804  *    This routine returns the numbers of characters the tty driver will
 805  *    accept for queuing to be written. This number is subject to change as
 806  *    output buffers get emptied, or if the output flow control is acted.
 807  */
 808 static int ircomm_tty_write_room(struct tty_struct *tty)
 809 {
 810         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 811         unsigned long flags;
 812         int ret;
 813
 814         ASSERT(self != NULL, return -1;);
 815         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 816
 817 #ifdef IRCOMM_NO_TX_BEFORE_INIT
 818         /* max_header_size tells us if the channel is initialised or not. */
 819         if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
 820                 /* Don't bother us yet */
 821                 return 0;
 822 #endif
 823
 824         /* Check if we are allowed to transmit any data.
 825          * hw_stopped is the regular flow control.
 826          * Jean II */
 827         if (tty->hw_stopped)
 828                 ret = 0;
 829         else {
 830                 save_flags(flags);
 831                 cli();
 832                 if (self->tx_skb)
 833                         ret = self->tx_data_size - self->tx_skb->len;
 834                 else
 835                         ret = self->max_data_size;
 836                 restore_flags(flags);
 837         }
 838         IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__, ret);
 839
 840         return ret;
 841 }
 842
 843 /*
 844  * Function ircomm_tty_wait_until_sent (tty, timeout)
 845  *
 846  *    This routine waits until the device has written out all of the
 847  *    characters in its transmitter FIFO.
 848  */
 849 static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 850 {
 851         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 852         unsigned long orig_jiffies, poll_time;
 853
 854         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 855
 856         ASSERT(self != NULL, return;);
 857         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 858
 859         orig_jiffies = jiffies;
 860
 861         /* Set poll time to 200 ms */
 862         poll_time = IRDA_MIN(timeout, MSECS_TO_JIFFIES(200));
 863
 864         while (self->tx_skb && self->tx_skb->len) {
 865                 current->state = TASK_INTERRUPTIBLE;
 866                 schedule_timeout(poll_time);
 867                 if (signal_pending(current))
 868                         break;
 869                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 870                         break;
 871         }
 872         current->state = TASK_RUNNING;
 873 }
 874
 875 /*
 876  * Function ircomm_tty_throttle (tty)
 877  *
 878  *    This routine notifies the tty driver that input buffers for the line
 879  *    discipline are close to full, and it should somehow signal that no
 880  *    more characters should be sent to the tty.
 881  */
 882 static void ircomm_tty_throttle(struct tty_struct *tty)
 883 {
 884         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 885
 886         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 887
 888         ASSERT(self != NULL, return;);
 889         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 890
 891         /* Software flow control? */
 892         if (I_IXOFF(tty))
 893                 ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
 894
 895         /* Hardware flow control? */
 896         if (tty->termios->c_cflag & CRTSCTS) {
 897                 self->settings.dte &= ~IRCOMM_RTS;
 898                 self->settings.dte |= IRCOMM_DELTA_RTS;
 899
 900                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 901         }
 902
 903         ircomm_flow_request(self->ircomm, FLOW_STOP);
 904 }
 905
 906 /*
 907  * Function ircomm_tty_unthrottle (tty)
 908  *
 909  *    This routine notifies the tty drivers that it should signals that
 910  *    characters can now be sent to the tty without fear of overrunning the
 911  *    input buffers of the line disciplines.
 912  */
 913 static void ircomm_tty_unthrottle(struct tty_struct *tty)
 914 {
 915         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 916
 917         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 918
 919         ASSERT(self != NULL, return;);
 920         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 921
 922         /* Using software flow control? */
 923         if (I_IXOFF(tty)) {
 924                 ircomm_tty_send_xchar(tty, START_CHAR(tty));
 925         }
 926
 927         /* Using hardware flow control? */
 928         if (tty->termios->c_cflag & CRTSCTS) {
 929                 self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
 930
 931                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 932                 IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__);
 933         }
 934         ircomm_flow_request(self->ircomm, FLOW_START);
 935 }
 936
 937 /*
 938  * Function ircomm_tty_chars_in_buffer (tty)
 939  *
 940  *    Indicates if there are any data in the buffer
 941  *
 942  */
 943 static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
 944 {
 945         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 946         unsigned long flags;
 947         int len = 0;
 948
 949         ASSERT(self != NULL, return -1;);
 950         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 951
 952         save_flags(flags);
 953         cli();
 954
 955         if (self->tx_skb)
 956                 len = self->tx_skb->len;
 957
 958         restore_flags(flags);
 959
 960         return len;
 961 }
 962
 963 static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
 964 {
 965         unsigned long flags;
 966
 967         ASSERT(self != NULL, return;);
 968         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 969
 970         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
 971
 972         if (!(self->flags & ASYNC_INITIALIZED))
 973                 return;
 974
 975         save_flags(flags);
 976         cli();
 977
 978         del_timer(&self->watchdog_timer);
 979
 980         /* Free parameter buffer */
 981         if (self->ctrl_skb) {
 982                 dev_kfree_skb(self->ctrl_skb);
 983                 self->ctrl_skb = NULL;
 984         }
 985
 986         /* Free transmit buffer */
 987         if (self->tx_skb) {
 988                 dev_kfree_skb(self->tx_skb);
 989                 self->tx_skb = NULL;
 990         }
 991
 992         ircomm_tty_detach_cable(self);
 993
 994         if (self->ircomm) {
 995                 ircomm_close(self->ircomm);
 996                 self->ircomm = NULL;
 997         }
 998         self->flags &= ~ASYNC_INITIALIZED;
 999
1000         restore_flags(flags);
1001 }
1002
1003 /*
1004  * Function ircomm_tty_hangup (tty)
1005  *
1006  *    This routine notifies the tty driver that it should hangup the tty
1007  *    device.
1008  *
1009  */
1010 static void ircomm_tty_hangup(struct tty_struct *tty)
1011 {
1012         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1013
1014         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
1015
1016         ASSERT(self != NULL, return;);
1017         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1018
1019         if (!tty)
1020                 return;
1021
1022         /* ircomm_tty_flush_buffer(tty); */
1023         ircomm_tty_shutdown(self);
1024
1025         self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
1026         self->tty = 0;
1027         self->open_count = 0;
1028         wake_up_interruptible(&self->open_wait);
1029 }
1030
1031 /*
1032  * Function ircomm_tty_send_xchar (tty, ch)
1033  *
1034  *    This routine is used to send a high-priority XON/XOFF character to
1035  *    the device.
1036  */
1037 static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
1038 {
1039         IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__);
1040 }
1041
1042 /*
1043  * Function ircomm_tty_start (tty)
1044  *
1045  *    This routine notifies the tty driver that it resume sending
1046  *    characters to the tty device.
1047  */
1048 void ircomm_tty_start(struct tty_struct *tty)
1049 {
1050         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1051
1052         ircomm_flow_request(self->ircomm, FLOW_START);
1053 }
1054
1055 /*
1056  * Function ircomm_tty_stop (tty)
1057  *
1058  *     This routine notifies the tty driver that it should stop outputting
1059  *     characters to the tty device.
1060  */
1061 void ircomm_tty_stop(struct tty_struct *tty)
1062 {
1063         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
1064
1065         ASSERT(self != NULL, return;);
1066         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1067
1068         ircomm_flow_request(self->ircomm, FLOW_STOP);
1069 }
1070
1071 /*
1072  * Function ircomm_check_modem_status (self)
1073  *
1074  *    Check for any changes in the DCE's line settings. This function should
1075  *    be called whenever the dce parameter settings changes, to update the
1076  *    flow control settings and other things
1077  */
1078 void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
1079 {
1080         struct tty_struct *tty;
1081         int status;
1082
1083         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
1084
1085         ASSERT(self != NULL, return;);
1086         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1087
1088         tty = self->tty;
1089
1090         status = self->settings.dce;
1091
1092         if (status & IRCOMM_DCE_DELTA_ANY) {
1093                 /*wake_up_interruptible(&self->delta_msr_wait);*/
1094         }
1095         if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) {
1096                 IRDA_DEBUG(2, "%s(), ircomm%d CD now %s...\n",
1097                         __FUNCTION__, self->line, (status & IRCOMM_CD) ? "on" : "off");
1098
1099                 if (status & IRCOMM_CD) {
1100                         wake_up_interruptible(&self->open_wait);
1101                 } else if (!((self->flags & ASYNC_CALLOUT_ACTIVE) &&
1102                            (self->flags & ASYNC_CALLOUT_NOHUP)))
1103                 {
1104                         IRDA_DEBUG(2, "%s(), Doing serial hangup..\n", __FUNCTION__);
1105                         if (tty)
1106                                 tty_hangup(tty);
1107
1108                         /* Hangup will remote the tty, so better break out */
1109                         return;
1110                 }
1111         }
1112         if (self->flags & ASYNC_CTS_FLOW) {
1113                 if (tty->hw_stopped) {
1114                         if (status & IRCOMM_CTS) {
1115                                 IRDA_DEBUG(2, "%s(), CTS tx start...\n", __FUNCTION__);
1116                                 tty->hw_stopped = 0;
1117
1118                                 /* Wake up processes blocked on open */
1119                                 wake_up_interruptible(&self->open_wait);
1120
1121                                 queue_task(&self->tqueue, &tq_immediate);
1122                                 mark_bh(IMMEDIATE_BH);
1123                                 return;
1124                         }
1125                 } else {
1126                         if (!(status & IRCOMM_CTS)) {
1127                                 IRDA_DEBUG(2, "%s(), CTS tx stop...\n", __FUNCTION__);
1128                                 tty->hw_stopped = 1;
1129                         }
1130                 }
1131         }
1132 }
1133
1134 /*
1135  * Function ircomm_tty_data_indication (instance, sap, skb)
1136  *
1137  *    Handle incoming data, and deliver it to the line discipline
1138  *
1139  */
1140 static int ircomm_tty_data_indication(void *instance, void *sap,
1141                                       struct sk_buff *skb)
1142 {
1143         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1144
1145         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
1146
1147         ASSERT(self != NULL, return -1;);
1148         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1149         ASSERT(skb != NULL, return -1;);
1150
1151         if (!self->tty) {
1152                 IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__);
1153                 dev_kfree_skb(skb);
1154                 return 0;
1155         }
1156
1157         /*
1158          * If we receive data when hardware is stopped then something is wrong.
1159          * We try to poll the peers line settings to check if we are up todate.
1160          * Devices like WinCE can do this, and since they don't send any
1161          * params, we can just as well declare the hardware for running.
1162          */
1163         if (self->tty->hw_stopped && (self->flow == FLOW_START)) {
1164                 IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__);
1165                 ircomm_param_request(self, IRCOMM_POLL, TRUE);
1166
1167                 /* We can just as well declare the hardware for running */
1168                 ircomm_tty_send_initial_parameters(self);
1169                 ircomm_tty_link_established(self);
1170         }
1171
1172         /*
1173          * Just give it over to the line discipline. There is no need to
1174          * involve the flip buffers, since we are not running in an interrupt
1175          * handler
1176          */
1177         self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len);
1178         dev_kfree_skb(skb);
1179
1180         return 0;
1181 }
1182
1183 /*
1184  * Function ircomm_tty_control_indication (instance, sap, skb)
1185  *
1186  *    Parse all incoming parameters (easy!)
1187  *
1188  */
1189 static int ircomm_tty_control_indication(void *instance, void *sap,
1190                                          struct sk_buff *skb)
1191 {
1192         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1193         int clen;
1194
1195         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
1196
1197         ASSERT(self != NULL, return -1;);
1198         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
1199         ASSERT(skb != NULL, return -1;);
1200
1201         clen = skb->data[0];
1202
1203         irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
1204                                &ircomm_param_info);
1205         dev_kfree_skb(skb);
1206
1207         return 0;
1208 }
1209
1210 /*
1211  * Function ircomm_tty_flow_indication (instance, sap, cmd)
1212  *
1213  *    This function is called by IrTTP when it wants us to slow down the
1214  *    transmission of data. We just mark the hardware as stopped, and wait
1215  *    for IrTTP to notify us that things are OK again.
1216  */
1217 static void ircomm_tty_flow_indication(void *instance, void *sap,
1218                                        LOCAL_FLOW cmd)
1219 {
1220         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
1221         struct tty_struct *tty;
1222
1223         ASSERT(self != NULL, return;);
1224         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
1225
1226         tty = self->tty;
1227
1228         switch (cmd) {
1229         case FLOW_START:
1230                 IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__);
1231                 tty->hw_stopped = 0;
1232
1233                 /* ircomm_tty_do_softint will take care of the rest */
1234                 queue_task(&self->tqueue, &tq_immediate);
1235                 mark_bh(IMMEDIATE_BH);
1236                 break;
1237         default:  /* If we get here, something is very wrong, better stop */
1238         case FLOW_STOP:
1239                 IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__);
1240                 tty->hw_stopped = 1;
1241                 break;
1242         }
1243         self->flow = cmd;
1244 }
1245
1246 static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf)
1247 {
1248         int  ret=0;
1249
1250         ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]);
1251
1252         ret += sprintf(buf+ret, "Service type: ");
1253         if (self->service_type & IRCOMM_9_WIRE)
1254                 ret += sprintf(buf+ret, "9_WIRE");
1255         else if (self->service_type & IRCOMM_3_WIRE)
1256                 ret += sprintf(buf+ret, "3_WIRE");
1257         else if (self->service_type & IRCOMM_3_WIRE_RAW)
1258                 ret += sprintf(buf+ret, "3_WIRE_RAW");
1259         else
1260                 ret += sprintf(buf+ret, "No common service type!\n");
1261         ret += sprintf(buf+ret, "\n");
1262
1263         ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name);
1264
1265         ret += sprintf(buf+ret, "DTE status: ");
1266         if (self->settings.dte & IRCOMM_RTS)
1267                 ret += sprintf(buf+ret, "RTS|");
1268         if (self->settings.dte & IRCOMM_DTR)
1269                 ret += sprintf(buf+ret, "DTR|");
1270         if (self->settings.dte)
1271                 ret--; /* remove the last | */
1272         ret += sprintf(buf+ret, "\n");
1273
1274         ret += sprintf(buf+ret, "DCE status: ");
1275         if (self->settings.dce & IRCOMM_CTS)
1276                 ret += sprintf(buf+ret, "CTS|");
1277         if (self->settings.dce & IRCOMM_DSR)
1278                 ret += sprintf(buf+ret, "DSR|");
1279         if (self->settings.dce & IRCOMM_CD)
1280                 ret += sprintf(buf+ret, "CD|");
1281         if (self->settings.dce & IRCOMM_RI)
1282                 ret += sprintf(buf+ret, "RI|");
1283         if (self->settings.dce)
1284                 ret--; /* remove the last | */
1285         ret += sprintf(buf+ret, "\n");
1286
1287         ret += sprintf(buf+ret, "Configuration: ");
1288         if (!self->settings.null_modem)
1289                 ret += sprintf(buf+ret, "DTE <-> DCE\n");
1290         else
1291                 ret += sprintf(buf+ret,
1292                                "DTE <-> DTE (null modem emulation)\n");
1293
1294         ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate);
1295
1296         ret += sprintf(buf+ret, "Flow control: ");
1297         if (self->settings.flow_control & IRCOMM_XON_XOFF_IN)
1298                 ret += sprintf(buf+ret, "XON_XOFF_IN|");
1299         if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT)
1300                 ret += sprintf(buf+ret, "XON_XOFF_OUT|");
1301         if (self->settings.flow_control & IRCOMM_RTS_CTS_IN)
1302                 ret += sprintf(buf+ret, "RTS_CTS_IN|");
1303         if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT)
1304                 ret += sprintf(buf+ret, "RTS_CTS_OUT|");
1305         if (self->settings.flow_control & IRCOMM_DSR_DTR_IN)
1306                 ret += sprintf(buf+ret, "DSR_DTR_IN|");
1307         if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT)
1308                 ret += sprintf(buf+ret, "DSR_DTR_OUT|");
1309         if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN)
1310                 ret += sprintf(buf+ret, "ENQ_ACK_IN|");
1311         if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT)
1312                 ret += sprintf(buf+ret, "ENQ_ACK_OUT|");
1313         if (self->settings.flow_control)
1314                 ret--; /* remove the last | */
1315         ret += sprintf(buf+ret, "\n");
1316
1317         ret += sprintf(buf+ret, "Flags: ");
1318         if (self->flags & ASYNC_CTS_FLOW)
1319                 ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|");
1320         if (self->flags & ASYNC_CHECK_CD)
1321                 ret += sprintf(buf+ret, "ASYNC_CHECK_CD|");
1322         if (self->flags & ASYNC_INITIALIZED)
1323                 ret += sprintf(buf+ret, "ASYNC_INITIALIZED|");
1324         if (self->flags & ASYNC_LOW_LATENCY)
1325                 ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|");
1326         if (self->flags & ASYNC_CLOSING)
1327                 ret += sprintf(buf+ret, "ASYNC_CLOSING|");
1328         if (self->flags & ASYNC_NORMAL_ACTIVE)
1329                 ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|");
1330         if (self->flags & ASYNC_CALLOUT_ACTIVE)
1331                 ret += sprintf(buf+ret, "ASYNC_CALLOUT_ACTIVE|");
1332         if (self->flags)
1333                 ret--; /* remove the last | */
1334         ret += sprintf(buf+ret, "\n");
1335
1336         ret += sprintf(buf+ret, "Role: %s\n", self->client ?
1337                        "client" : "server");
1338         ret += sprintf(buf+ret, "Open count: %d\n", self->open_count);
1339         ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size);
1340         ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size);
1341
1342         if (self->tty)
1343                 ret += sprintf(buf+ret, "Hardware: %s\n",
1344                                self->tty->hw_stopped ? "Stopped" : "Running");
1345
1346         ret += sprintf(buf+ret, "\n");
1347         return ret;
1348 }
1349
1350
1351 /*
1352  * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused)
1353  *
1354  *
1355  *
1356  */
1357 #ifdef CONFIG_PROC_FS
1358 static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len,
1359                                 int *eof, void *unused)
1360 {
1361         struct ircomm_tty_cb *self;
1362         int count = 0, l;
1363         off_t begin = 0;
1364
1365         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
1366         while ((self != NULL) && (count < 4000)) {
1367                 if (self->magic != IRCOMM_TTY_MAGIC)
1368                         return 0;
1369
1370                 l = ircomm_tty_line_info(self, buf + count);
1371                 count += l;
1372                 if (count+begin > offset+len)
1373                         goto done;
1374                 if (count+begin < offset) {
1375                         begin += count;
1376                         count = 0;
1377                 }
1378
1379                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
1380         }
1381         *eof = 1;
1382 done:
1383         if (offset >= count+begin)
1384                 return 0;
1385         *start = buf + (offset-begin);
1386         return ((len < begin+count-offset) ? len : begin+count-offset);
1387 }
1388 #endif /* CONFIG_PROC_FS */
1389
1390 #ifdef MODULE
1391 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1392 MODULE_DESCRIPTION("IrCOMM serial TTY driver");
1393 MODULE_LICENSE("GPL");
1394
1395 int init_module(void)
1396 {
1397         return ircomm_tty_init();
1398 }
1399
1400 void cleanup_module(void)
1401 {
1402         ircomm_tty_cleanup();
1403 }
1404
1405 #endif /* MODULE */
1406
1407
1408
1409