vcs.maemo.org Git - h-e-n/blob - net/bluetooth/rfcomm/tty.c

   1 /*
   2    RFCOMM implementation for Linux Bluetooth stack (BlueZ).
   3    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
   4    Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License version 2 as
   8    published by the Free Software Foundation;
   9
  10    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  11    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  12    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  13    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  14    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  15    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18
  19    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  20    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  21    SOFTWARE IS DISCLAIMED.
  22 */
  23
  24 /*
  25  * RFCOMM TTY.
  26  *
  27  * $Id: tty.c,v 1.24 2002/10/03 01:54:38 holtmann Exp $
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32
  33 #include <linux/tty.h>
  34 #include <linux/tty_driver.h>
  35 #include <linux/tty_flip.h>
  36
  37 #include <linux/slab.h>
  38 #include <linux/skbuff.h>
  39
  40 #include <net/bluetooth/bluetooth.h>
  41 #include <net/bluetooth/rfcomm.h>
  42
  43 #ifndef CONFIG_BT_RFCOMM_DEBUG
  44 #undef  BT_DBG
  45 #define BT_DBG(D...)
  46 #endif
  47
  48 #define RFCOMM_TTY_MAGIC 0x6d02         /* magic number for rfcomm struct */
  49 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
  50 #define RFCOMM_TTY_MAJOR 216            /* device node major id of the usb/bluetooth.c driver */
  51 #define RFCOMM_TTY_MINOR 0
  52
  53 static struct tty_driver *rfcomm_tty_driver;
  54
  55 struct rfcomm_dev {
  56         struct list_head        list;
  57         atomic_t                refcnt;
  58
  59         char                    name[12];
  60         int                     id;
  61         unsigned long           flags;
  62         int                     opened;
  63         int                     err;
  64
  65         bdaddr_t                src;
  66         bdaddr_t                dst;
  67         u8                      channel;
  68
  69         uint                    modem_status;
  70
  71         struct rfcomm_dlc       *dlc;
  72         struct tty_struct       *tty;
  73         wait_queue_head_t       wait;
  74         struct tasklet_struct   wakeup_task;
  75
  76         atomic_t                wmem_alloc;
  77 };
  78
  79 static LIST_HEAD(rfcomm_dev_list);
  80 static DEFINE_RWLOCK(rfcomm_dev_lock);
  81
  82 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
  83 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
  84 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
  85
  86 static void rfcomm_tty_wakeup(unsigned long arg);
  87
  88 /* ---- Device functions ---- */
  89 static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
  90 {
  91         struct rfcomm_dlc *dlc = dev->dlc;
  92
  93         BT_DBG("dev %p dlc %p", dev, dlc);
  94
  95         rfcomm_dlc_lock(dlc);
  96         /* Detach DLC if it's owned by this dev */
  97         if (dlc->owner == dev)
  98                 dlc->owner = NULL;
  99         rfcomm_dlc_unlock(dlc);
 100
 101         rfcomm_dlc_put(dlc);
 102
 103         tty_unregister_device(rfcomm_tty_driver, dev->id);
 104
 105         /* Refcount should only hit zero when called from rfcomm_dev_del()
 106            which will have taken us off the list. Everything else are
 107            refcounting bugs. */
 108         BUG_ON(!list_empty(&dev->list));
 109
 110         kfree(dev);
 111
 112         /* It's safe to call module_put() here because socket still
 113            holds reference to this module. */
 114         module_put(THIS_MODULE);
 115 }
 116
 117 static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
 118 {
 119         atomic_inc(&dev->refcnt);
 120 }
 121
 122 static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
 123 {
 124         /* The reason this isn't actually a race, as you no
 125            doubt have a little voice screaming at you in your
 126            head, is that the refcount should never actually
 127            reach zero unless the device has already been taken
 128            off the list, in rfcomm_dev_del(). And if that's not
 129            true, we'll hit the BUG() in rfcomm_dev_destruct()
 130            anyway. */
 131         if (atomic_dec_and_test(&dev->refcnt))
 132                 rfcomm_dev_destruct(dev);
 133 }
 134
 135 static struct rfcomm_dev *__rfcomm_dev_get(int id)
 136 {
 137         struct rfcomm_dev *dev;
 138         struct list_head  *p;
 139
 140         list_for_each(p, &rfcomm_dev_list) {
 141                 dev = list_entry(p, struct rfcomm_dev, list);
 142                 if (dev->id == id)
 143                         return dev;
 144         }
 145
 146         return NULL;
 147 }
 148
 149 static inline struct rfcomm_dev *rfcomm_dev_get(int id)
 150 {
 151         struct rfcomm_dev *dev;
 152
 153         read_lock(&rfcomm_dev_lock);
 154
 155         dev = __rfcomm_dev_get(id);
 156         if (dev)
 157                 rfcomm_dev_hold(dev);
 158
 159         read_unlock(&rfcomm_dev_lock);
 160
 161         return dev;
 162 }
 163
 164 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 165 {
 166         struct rfcomm_dev *dev;
 167         struct list_head *head = &rfcomm_dev_list, *p;
 168         int err = 0;
 169
 170         BT_DBG("id %d channel %d", req->dev_id, req->channel);
 171
 172         dev = kmalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
 173         if (!dev)
 174                 return -ENOMEM;
 175         memset(dev, 0, sizeof(struct rfcomm_dev));
 176
 177         write_lock_bh(&rfcomm_dev_lock);
 178
 179         if (req->dev_id < 0) {
 180                 dev->id = 0;
 181
 182                 list_for_each(p, &rfcomm_dev_list) {
 183                         if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
 184                                 break;
 185
 186                         dev->id++;
 187                         head = p;
 188                 }
 189         } else {
 190                 dev->id = req->dev_id;
 191
 192                 list_for_each(p, &rfcomm_dev_list) {
 193                         struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
 194
 195                         if (entry->id == dev->id) {
 196                                 err = -EADDRINUSE;
 197                                 goto out;
 198                         }
 199
 200                         if (entry->id > dev->id - 1)
 201                                 break;
 202
 203                         head = p;
 204                 }
 205         }
 206
 207         if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
 208                 err = -ENFILE;
 209                 goto out;
 210         }
 211
 212         sprintf(dev->name, "rfcomm%d", dev->id);
 213
 214         list_add(&dev->list, head);
 215         atomic_set(&dev->refcnt, 1);
 216
 217         bacpy(&dev->src, &req->src);
 218         bacpy(&dev->dst, &req->dst);
 219         dev->channel = req->channel;
 220
 221         dev->flags = req->flags &
 222                 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
 223
 224         init_waitqueue_head(&dev->wait);
 225         tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
 226
 227         rfcomm_dlc_lock(dlc);
 228         dlc->data_ready   = rfcomm_dev_data_ready;
 229         dlc->state_change = rfcomm_dev_state_change;
 230         dlc->modem_status = rfcomm_dev_modem_status;
 231
 232         dlc->owner = dev;
 233         dev->dlc   = dlc;
 234         rfcomm_dlc_unlock(dlc);
 235
 236         /* It's safe to call __module_get() here because socket already
 237            holds reference to this module. */
 238         __module_get(THIS_MODULE);
 239
 240 out:
 241         write_unlock_bh(&rfcomm_dev_lock);
 242
 243         if (err) {
 244                 kfree(dev);
 245                 return err;
 246         }
 247
 248         tty_register_device(rfcomm_tty_driver, dev->id, NULL);
 249
 250         return dev->id;
 251 }
 252
 253 static void rfcomm_dev_del(struct rfcomm_dev *dev)
 254 {
 255         BT_DBG("dev %p", dev);
 256
 257         write_lock_bh(&rfcomm_dev_lock);
 258         list_del_init(&dev->list);
 259         write_unlock_bh(&rfcomm_dev_lock);
 260
 261         rfcomm_dev_put(dev);
 262 }
 263
 264 /* ---- Send buffer ---- */
 265 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
 266 {
 267         /* We can't let it be zero, because we don't get a callback
 268            when tx_credits becomes nonzero, hence we'd never wake up */
 269         return dlc->mtu * (dlc->tx_credits?:1);
 270 }
 271
 272 static void rfcomm_wfree(struct sk_buff *skb)
 273 {
 274         struct rfcomm_dev *dev = (void *) skb->sk;
 275         atomic_sub(skb->truesize, &dev->wmem_alloc);
 276         if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
 277                 tasklet_schedule(&dev->wakeup_task);
 278         rfcomm_dev_put(dev);
 279 }
 280
 281 static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
 282 {
 283         rfcomm_dev_hold(dev);
 284         atomic_add(skb->truesize, &dev->wmem_alloc);
 285         skb->sk = (void *) dev;
 286         skb->destructor = rfcomm_wfree;
 287 }
 288
 289 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
 290 {
 291         if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
 292                 struct sk_buff *skb = alloc_skb(size, priority);
 293                 if (skb) {
 294                         rfcomm_set_owner_w(skb, dev);
 295                         return skb;
 296                 }
 297         }
 298         return NULL;
 299 }
 300
 301 /* ---- Device IOCTLs ---- */
 302
 303 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
 304
 305 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
 306 {
 307         struct rfcomm_dev_req req;
 308         struct rfcomm_dlc *dlc;
 309         int id;
 310
 311         if (copy_from_user(&req, arg, sizeof(req)))
 312                 return -EFAULT;
 313
 314         BT_DBG("sk %p dev_id %id flags 0x%x", sk, req.dev_id, req.flags);
 315
 316         if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
 317                 return -EPERM;
 318
 319         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 320                 /* Socket must be connected */
 321                 if (sk->sk_state != BT_CONNECTED)
 322                         return -EBADFD;
 323
 324                 dlc = rfcomm_pi(sk)->dlc;
 325                 rfcomm_dlc_hold(dlc);
 326         } else {
 327                 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 328                 if (!dlc)
 329                         return -ENOMEM;
 330         }
 331
 332         id = rfcomm_dev_add(&req, dlc);
 333         if (id < 0) {
 334                 rfcomm_dlc_put(dlc);
 335                 return id;
 336         }
 337
 338         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 339                 /* DLC is now used by device.
 340                  * Socket must be disconnected */
 341                 sk->sk_state = BT_CLOSED;
 342         }
 343
 344         return id;
 345 }
 346
 347 static int rfcomm_release_dev(void __user *arg)
 348 {
 349         struct rfcomm_dev_req req;
 350         struct rfcomm_dev *dev;
 351
 352         if (copy_from_user(&req, arg, sizeof(req)))
 353                 return -EFAULT;
 354
 355         BT_DBG("dev_id %id flags 0x%x", req.dev_id, req.flags);
 356
 357         if (!(dev = rfcomm_dev_get(req.dev_id)))
 358                 return -ENODEV;
 359
 360         if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
 361                 rfcomm_dev_put(dev);
 362                 return -EPERM;
 363         }
 364
 365         if (req.flags & (1 << RFCOMM_HANGUP_NOW))
 366                 rfcomm_dlc_close(dev->dlc, 0);
 367
 368         rfcomm_dev_del(dev);
 369         rfcomm_dev_put(dev);
 370         return 0;
 371 }
 372
 373 static int rfcomm_get_dev_list(void __user *arg)
 374 {
 375         struct rfcomm_dev_list_req *dl;
 376         struct rfcomm_dev_info *di;
 377         struct list_head *p;
 378         int n = 0, size, err;
 379         u16 dev_num;
 380
 381         BT_DBG("");
 382
 383         if (get_user(dev_num, (u16 __user *) arg))
 384                 return -EFAULT;
 385
 386         if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
 387                 return -EINVAL;
 388
 389         size = sizeof(*dl) + dev_num * sizeof(*di);
 390
 391         if (!(dl = kmalloc(size, GFP_KERNEL)))
 392                 return -ENOMEM;
 393
 394         di = dl->dev_info;
 395
 396         read_lock_bh(&rfcomm_dev_lock);
 397
 398         list_for_each(p, &rfcomm_dev_list) {
 399                 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
 400                 (di + n)->id      = dev->id;
 401                 (di + n)->flags   = dev->flags;
 402                 (di + n)->state   = dev->dlc->state;
 403                 (di + n)->channel = dev->channel;
 404                 bacpy(&(di + n)->src, &dev->src);
 405                 bacpy(&(di + n)->dst, &dev->dst);
 406                 if (++n >= dev_num)
 407                         break;
 408         }
 409
 410         read_unlock_bh(&rfcomm_dev_lock);
 411
 412         dl->dev_num = n;
 413         size = sizeof(*dl) + n * sizeof(*di);
 414
 415         err = copy_to_user(arg, dl, size);
 416         kfree(dl);
 417
 418         return err ? -EFAULT : 0;
 419 }
 420
 421 static int rfcomm_get_dev_info(void __user *arg)
 422 {
 423         struct rfcomm_dev *dev;
 424         struct rfcomm_dev_info di;
 425         int err = 0;
 426
 427         BT_DBG("");
 428
 429         if (copy_from_user(&di, arg, sizeof(di)))
 430                 return -EFAULT;
 431
 432         if (!(dev = rfcomm_dev_get(di.id)))
 433                 return -ENODEV;
 434
 435         di.flags   = dev->flags;
 436         di.channel = dev->channel;
 437         di.state   = dev->dlc->state;
 438         bacpy(&di.src, &dev->src);
 439         bacpy(&di.dst, &dev->dst);
 440
 441         if (copy_to_user(arg, &di, sizeof(di)))
 442                 err = -EFAULT;
 443
 444         rfcomm_dev_put(dev);
 445         return err;
 446 }
 447
 448 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
 449 {
 450         BT_DBG("cmd %d arg %p", cmd, arg);
 451
 452         switch (cmd) {
 453         case RFCOMMCREATEDEV:
 454                 return rfcomm_create_dev(sk, arg);
 455
 456         case RFCOMMRELEASEDEV:
 457                 return rfcomm_release_dev(arg);
 458
 459         case RFCOMMGETDEVLIST:
 460                 return rfcomm_get_dev_list(arg);
 461
 462         case RFCOMMGETDEVINFO:
 463                 return rfcomm_get_dev_info(arg);
 464         }
 465
 466         return -EINVAL;
 467 }
 468
 469 /* ---- DLC callbacks ---- */
 470 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 471 {
 472         struct rfcomm_dev *dev = dlc->owner;
 473         struct tty_struct *tty;
 474
 475         if (!dev || !(tty = dev->tty)) {
 476                 kfree_skb(skb);
 477                 return;
 478         }
 479
 480         BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
 481
 482         if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
 483                 tty_buffer_request_room(tty, skb->len);
 484                 tty_insert_flip_string(tty, skb->data, skb->len);
 485                 tty_flip_buffer_push(tty);
 486         } else
 487                 tty->ldisc.receive_buf(tty, skb->data, NULL, skb->len);
 488
 489         kfree_skb(skb);
 490 }
 491
 492 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 493 {
 494         struct rfcomm_dev *dev = dlc->owner;
 495         if (!dev)
 496                 return;
 497
 498         BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
 499
 500         dev->err = err;
 501         wake_up_interruptible(&dev->wait);
 502
 503         if (dlc->state == BT_CLOSED) {
 504                 if (!dev->tty) {
 505                         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 506                                 rfcomm_dev_hold(dev);
 507                                 rfcomm_dev_del(dev);
 508
 509                                 /* We have to drop DLC lock here, otherwise
 510                                    rfcomm_dev_put() will dead lock if it's
 511                                    the last reference. */
 512                                 rfcomm_dlc_unlock(dlc);
 513                                 rfcomm_dev_put(dev);
 514                                 rfcomm_dlc_lock(dlc);
 515                         }
 516                 } else
 517                         tty_hangup(dev->tty);
 518         }
 519 }
 520
 521 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
 522 {
 523         struct rfcomm_dev *dev = dlc->owner;
 524         if (!dev)
 525                 return;
 526
 527         BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 528
 529         if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
 530                 if (dev->tty && !C_CLOCAL(dev->tty))
 531                         tty_hangup(dev->tty);
 532         }
 533
 534         dev->modem_status =
 535                 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
 536                 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
 537                 ((v24_sig & RFCOMM_V24_IC)  ? TIOCM_RI : 0) |
 538                 ((v24_sig & RFCOMM_V24_DV)  ? TIOCM_CD : 0);
 539 }
 540
 541 /* ---- TTY functions ---- */
 542 static void rfcomm_tty_wakeup(unsigned long arg)
 543 {
 544         struct rfcomm_dev *dev = (void *) arg;
 545         struct tty_struct *tty = dev->tty;
 546         if (!tty)
 547                 return;
 548
 549         BT_DBG("dev %p tty %p", dev, tty);
 550
 551         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 552                 (tty->ldisc.write_wakeup)(tty);
 553
 554         wake_up_interruptible(&tty->write_wait);
 555 #ifdef SERIAL_HAVE_POLL_WAIT
 556         wake_up_interruptible(&tty->poll_wait);
 557 #endif
 558 }
 559
 560 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 561 {
 562         DECLARE_WAITQUEUE(wait, current);
 563         struct rfcomm_dev *dev;
 564         struct rfcomm_dlc *dlc;
 565         int err, id;
 566
 567         id = tty->index;
 568
 569         BT_DBG("tty %p id %d", tty, id);
 570
 571         /* We don't leak this refcount. For reasons which are not entirely
 572            clear, the TTY layer will call our ->close() method even if the
 573            open fails. We decrease the refcount there, and decreasing it
 574            here too would cause breakage. */
 575         dev = rfcomm_dev_get(id);
 576         if (!dev)
 577                 return -ENODEV;
 578
 579         BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
 580
 581         if (dev->opened++ != 0)
 582                 return 0;
 583
 584         dlc = dev->dlc;
 585
 586         /* Attach TTY and open DLC */
 587
 588         rfcomm_dlc_lock(dlc);
 589         tty->driver_data = dev;
 590         dev->tty = tty;
 591         rfcomm_dlc_unlock(dlc);
 592         set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 593
 594         err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
 595         if (err < 0)
 596                 return err;
 597
 598         /* Wait for DLC to connect */
 599         add_wait_queue(&dev->wait, &wait);
 600         while (1) {
 601                 set_current_state(TASK_INTERRUPTIBLE);
 602
 603                 if (dlc->state == BT_CLOSED) {
 604                         err = -dev->err;
 605                         break;
 606                 }
 607
 608                 if (dlc->state == BT_CONNECTED)
 609                         break;
 610
 611                 if (signal_pending(current)) {
 612                         err = -EINTR;
 613                         break;
 614                 }
 615
 616                 schedule();
 617         }
 618         set_current_state(TASK_RUNNING);
 619         remove_wait_queue(&dev->wait, &wait);
 620
 621         return err;
 622 }
 623
 624 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
 625 {
 626         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 627         if (!dev)
 628                 return;
 629
 630         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
 631
 632         if (--dev->opened == 0) {
 633                 /* Close DLC and dettach TTY */
 634                 rfcomm_dlc_close(dev->dlc, 0);
 635
 636                 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 637                 tasklet_kill(&dev->wakeup_task);
 638
 639                 rfcomm_dlc_lock(dev->dlc);
 640                 tty->driver_data = NULL;
 641                 dev->tty = NULL;
 642                 rfcomm_dlc_unlock(dev->dlc);
 643         }
 644
 645         rfcomm_dev_put(dev);
 646 }
 647
 648 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 649 {
 650         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 651         struct rfcomm_dlc *dlc = dev->dlc;
 652         struct sk_buff *skb;
 653         int err = 0, sent = 0, size;
 654
 655         BT_DBG("tty %p count %d", tty, count);
 656
 657         while (count) {
 658                 size = min_t(uint, count, dlc->mtu);
 659
 660                 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
 661
 662                 if (!skb)
 663                         break;
 664
 665                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 666
 667                 memcpy(skb_put(skb, size), buf + sent, size);
 668
 669                 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
 670                         kfree_skb(skb);
 671                         break;
 672                 }
 673
 674                 sent  += size;
 675                 count -= size;
 676         }
 677
 678         return sent ? sent : err;
 679 }
 680
 681 static int rfcomm_tty_write_room(struct tty_struct *tty)
 682 {
 683         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 684         int room;
 685
 686         BT_DBG("tty %p", tty);
 687
 688         room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
 689         if (room < 0)
 690                 room = 0;
 691         return room;
 692 }
 693
 694 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
 695 {
 696         BT_DBG("tty %p cmd 0x%02x", tty, cmd);
 697
 698         switch (cmd) {
 699         case TCGETS:
 700                 BT_DBG("TCGETS is not supported");
 701                 return -ENOIOCTLCMD;
 702
 703         case TCSETS:
 704                 BT_DBG("TCSETS is not supported");
 705                 return -ENOIOCTLCMD;
 706
 707         case TIOCMIWAIT:
 708                 BT_DBG("TIOCMIWAIT");
 709                 break;
 710
 711         case TIOCGICOUNT:
 712                 BT_DBG("TIOCGICOUNT");
 713                 break;
 714
 715         case TIOCGSERIAL:
 716                 BT_ERR("TIOCGSERIAL is not supported");
 717                 return -ENOIOCTLCMD;
 718
 719         case TIOCSSERIAL:
 720                 BT_ERR("TIOCSSERIAL is not supported");
 721                 return -ENOIOCTLCMD;
 722
 723         case TIOCSERGSTRUCT:
 724                 BT_ERR("TIOCSERGSTRUCT is not supported");
 725                 return -ENOIOCTLCMD;
 726
 727         case TIOCSERGETLSR:
 728                 BT_ERR("TIOCSERGETLSR is not supported");
 729                 return -ENOIOCTLCMD;
 730
 731         case TIOCSERCONFIG:
 732                 BT_ERR("TIOCSERCONFIG is not supported");
 733                 return -ENOIOCTLCMD;
 734
 735         default:
 736                 return -ENOIOCTLCMD;    /* ioctls which we must ignore */
 737
 738         }
 739
 740         return -ENOIOCTLCMD;
 741 }
 742
 743 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct termios *old)
 744 {
 745         struct termios *new = (struct termios *) tty->termios;
 746         int old_baud_rate = tty_termios_baud_rate(old);
 747         int new_baud_rate = tty_termios_baud_rate(new);
 748
 749         u8 baud, data_bits, stop_bits, parity, x_on, x_off;
 750         u16 changes = 0;
 751
 752         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 753
 754         BT_DBG("tty %p termios %p", tty, old);
 755
 756         /* Handle turning off CRTSCTS */
 757         if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
 758                 BT_DBG("Turning off CRTSCTS unsupported");
 759
 760         /* Parity on/off and when on, odd/even */
 761         if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
 762                         ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
 763                 changes |= RFCOMM_RPN_PM_PARITY;
 764                 BT_DBG("Parity change detected.");
 765         }
 766
 767         /* Mark and space parity are not supported! */
 768         if (new->c_cflag & PARENB) {
 769                 if (new->c_cflag & PARODD) {
 770                         BT_DBG("Parity is ODD");
 771                         parity = RFCOMM_RPN_PARITY_ODD;
 772                 } else {
 773                         BT_DBG("Parity is EVEN");
 774                         parity = RFCOMM_RPN_PARITY_EVEN;
 775                 }
 776         } else {
 777                 BT_DBG("Parity is OFF");
 778                 parity = RFCOMM_RPN_PARITY_NONE;
 779         }
 780
 781         /* Setting the x_on / x_off characters */
 782         if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
 783                 BT_DBG("XOFF custom");
 784                 x_on = new->c_cc[VSTOP];
 785                 changes |= RFCOMM_RPN_PM_XON;
 786         } else {
 787                 BT_DBG("XOFF default");
 788                 x_on = RFCOMM_RPN_XON_CHAR;
 789         }
 790
 791         if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
 792                 BT_DBG("XON custom");
 793                 x_off = new->c_cc[VSTART];
 794                 changes |= RFCOMM_RPN_PM_XOFF;
 795         } else {
 796                 BT_DBG("XON default");
 797                 x_off = RFCOMM_RPN_XOFF_CHAR;
 798         }
 799
 800         /* Handle setting of stop bits */
 801         if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
 802                 changes |= RFCOMM_RPN_PM_STOP;
 803
 804         /* POSIX does not support 1.5 stop bits and RFCOMM does not
 805          * support 2 stop bits. So a request for 2 stop bits gets
 806          * translated to 1.5 stop bits */
 807         if (new->c_cflag & CSTOPB) {
 808                 stop_bits = RFCOMM_RPN_STOP_15;
 809         } else {
 810                 stop_bits = RFCOMM_RPN_STOP_1;
 811         }
 812
 813         /* Handle number of data bits [5-8] */
 814         if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
 815                 changes |= RFCOMM_RPN_PM_DATA;
 816
 817         switch (new->c_cflag & CSIZE) {
 818         case CS5:
 819                 data_bits = RFCOMM_RPN_DATA_5;
 820                 break;
 821         case CS6:
 822                 data_bits = RFCOMM_RPN_DATA_6;
 823                 break;
 824         case CS7:
 825                 data_bits = RFCOMM_RPN_DATA_7;
 826                 break;
 827         case CS8:
 828                 data_bits = RFCOMM_RPN_DATA_8;
 829                 break;
 830         default:
 831                 data_bits = RFCOMM_RPN_DATA_8;
 832                 break;
 833         }
 834
 835         /* Handle baudrate settings */
 836         if (old_baud_rate != new_baud_rate)
 837                 changes |= RFCOMM_RPN_PM_BITRATE;
 838
 839         switch (new_baud_rate) {
 840         case 2400:
 841                 baud = RFCOMM_RPN_BR_2400;
 842                 break;
 843         case 4800:
 844                 baud = RFCOMM_RPN_BR_4800;
 845                 break;
 846         case 7200:
 847                 baud = RFCOMM_RPN_BR_7200;
 848                 break;
 849         case 9600:
 850                 baud = RFCOMM_RPN_BR_9600;
 851                 break;
 852         case 19200:
 853                 baud = RFCOMM_RPN_BR_19200;
 854                 break;
 855         case 38400:
 856                 baud = RFCOMM_RPN_BR_38400;
 857                 break;
 858         case 57600:
 859                 baud = RFCOMM_RPN_BR_57600;
 860                 break;
 861         case 115200:
 862                 baud = RFCOMM_RPN_BR_115200;
 863                 break;
 864         case 230400:
 865                 baud = RFCOMM_RPN_BR_230400;
 866                 break;
 867         default:
 868                 /* 9600 is standard accordinag to the RFCOMM specification */
 869                 baud = RFCOMM_RPN_BR_9600;
 870                 break;
 871
 872         }
 873
 874         if (changes)
 875                 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
 876                                 data_bits, stop_bits, parity,
 877                                 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
 878
 879         return;
 880 }
 881
 882 static void rfcomm_tty_throttle(struct tty_struct *tty)
 883 {
 884         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 885
 886         BT_DBG("tty %p dev %p", tty, dev);
 887
 888         rfcomm_dlc_throttle(dev->dlc);
 889 }
 890
 891 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
 892 {
 893         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 894
 895         BT_DBG("tty %p dev %p", tty, dev);
 896
 897         rfcomm_dlc_unthrottle(dev->dlc);
 898 }
 899
 900 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 901 {
 902         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 903         struct rfcomm_dlc *dlc = dev->dlc;
 904
 905         BT_DBG("tty %p dev %p", tty, dev);
 906
 907         if (!skb_queue_empty(&dlc->tx_queue))
 908                 return dlc->mtu;
 909
 910         return 0;
 911 }
 912
 913 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
 914 {
 915         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 916         if (!dev)
 917                 return;
 918
 919         BT_DBG("tty %p dev %p", tty, dev);
 920
 921         skb_queue_purge(&dev->dlc->tx_queue);
 922
 923         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 924                 tty->ldisc.write_wakeup(tty);
 925 }
 926
 927 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
 928 {
 929         BT_DBG("tty %p ch %c", tty, ch);
 930 }
 931
 932 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 933 {
 934         BT_DBG("tty %p timeout %d", tty, timeout);
 935 }
 936
 937 static void rfcomm_tty_hangup(struct tty_struct *tty)
 938 {
 939         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 940         if (!dev)
 941                 return;
 942
 943         BT_DBG("tty %p dev %p", tty, dev);
 944
 945         rfcomm_tty_flush_buffer(tty);
 946
 947         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
 948                 rfcomm_dev_del(dev);
 949 }
 950
 951 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
 952 {
 953         return 0;
 954 }
 955
 956 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
 957 {
 958         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 959
 960         BT_DBG("tty %p dev %p", tty, dev);
 961
 962         return dev->modem_status;
 963 }
 964
 965 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
 966 {
 967         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 968         struct rfcomm_dlc *dlc = dev->dlc;
 969         u8 v24_sig;
 970
 971         BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
 972
 973         rfcomm_dlc_get_modem_status(dlc, &v24_sig);
 974
 975         if (set & TIOCM_DSR || set & TIOCM_DTR)
 976                 v24_sig |= RFCOMM_V24_RTC;
 977         if (set & TIOCM_RTS || set & TIOCM_CTS)
 978                 v24_sig |= RFCOMM_V24_RTR;
 979         if (set & TIOCM_RI)
 980                 v24_sig |= RFCOMM_V24_IC;
 981         if (set & TIOCM_CD)
 982                 v24_sig |= RFCOMM_V24_DV;
 983
 984         if (clear & TIOCM_DSR || clear & TIOCM_DTR)
 985                 v24_sig &= ~RFCOMM_V24_RTC;
 986         if (clear & TIOCM_RTS || clear & TIOCM_CTS)
 987                 v24_sig &= ~RFCOMM_V24_RTR;
 988         if (clear & TIOCM_RI)
 989                 v24_sig &= ~RFCOMM_V24_IC;
 990         if (clear & TIOCM_CD)
 991                 v24_sig &= ~RFCOMM_V24_DV;
 992
 993         rfcomm_dlc_set_modem_status(dlc, v24_sig);
 994
 995         return 0;
 996 }
 997
 998 /* ---- TTY structure ---- */
 999
1000 static struct tty_operations rfcomm_ops = {
1001         .open                   = rfcomm_tty_open,
1002         .close                  = rfcomm_tty_close,
1003         .write                  = rfcomm_tty_write,
1004         .write_room             = rfcomm_tty_write_room,
1005         .chars_in_buffer        = rfcomm_tty_chars_in_buffer,
1006         .flush_buffer           = rfcomm_tty_flush_buffer,
1007         .ioctl                  = rfcomm_tty_ioctl,
1008         .throttle               = rfcomm_tty_throttle,
1009         .unthrottle             = rfcomm_tty_unthrottle,
1010         .set_termios            = rfcomm_tty_set_termios,
1011         .send_xchar             = rfcomm_tty_send_xchar,
1012         .hangup                 = rfcomm_tty_hangup,
1013         .wait_until_sent        = rfcomm_tty_wait_until_sent,
1014         .read_proc              = rfcomm_tty_read_proc,
1015         .tiocmget               = rfcomm_tty_tiocmget,
1016         .tiocmset               = rfcomm_tty_tiocmset,
1017 };
1018
1019 int rfcomm_init_ttys(void)
1020 {
1021         rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1022         if (!rfcomm_tty_driver)
1023                 return -1;
1024
1025         rfcomm_tty_driver->owner        = THIS_MODULE;
1026         rfcomm_tty_driver->driver_name  = "rfcomm";
1027         rfcomm_tty_driver->devfs_name   = "bluetooth/rfcomm/";
1028         rfcomm_tty_driver->name         = "rfcomm";
1029         rfcomm_tty_driver->major        = RFCOMM_TTY_MAJOR;
1030         rfcomm_tty_driver->minor_start  = RFCOMM_TTY_MINOR;
1031         rfcomm_tty_driver->type         = TTY_DRIVER_TYPE_SERIAL;
1032         rfcomm_tty_driver->subtype      = SERIAL_TYPE_NORMAL;
1033         rfcomm_tty_driver->flags        = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
1034         rfcomm_tty_driver->init_termios = tty_std_termios;
1035         rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1036         tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1037
1038         if (tty_register_driver(rfcomm_tty_driver)) {
1039                 BT_ERR("Can't register RFCOMM TTY driver");
1040                 put_tty_driver(rfcomm_tty_driver);
1041                 return -1;
1042         }
1043
1044         BT_INFO("RFCOMM TTY layer initialized");
1045
1046         return 0;
1047 }
1048
1049 void rfcomm_cleanup_ttys(void)
1050 {
1051         tty_unregister_driver(rfcomm_tty_driver);
1052         put_tty_driver(rfcomm_tty_driver);
1053 }