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/module.h>
  31
  32 #include <linux/tty.h>
  33 #include <linux/tty_driver.h>
  34 #include <linux/tty_flip.h>
  35
  36 #include <linux/capability.h>
  37 #include <linux/slab.h>
  38 #include <linux/skbuff.h>
  39
  40 #include <net/bluetooth/bluetooth.h>
  41 #include <net/bluetooth/hci_core.h>
  42 #include <net/bluetooth/rfcomm.h>
  43
  44 #ifndef CONFIG_BT_RFCOMM_DEBUG
  45 #undef  BT_DBG
  46 #define BT_DBG(D...)
  47 #endif
  48
  49 #define RFCOMM_TTY_MAGIC 0x6d02         /* magic number for rfcomm struct */
  50 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
  51 #define RFCOMM_TTY_MAJOR 216            /* device node major id of the usb/bluetooth.c driver */
  52 #define RFCOMM_TTY_MINOR 0
  53
  54 static struct tty_driver *rfcomm_tty_driver;
  55
  56 struct rfcomm_dev {
  57         struct list_head        list;
  58         atomic_t                refcnt;
  59
  60         char                    name[12];
  61         int                     id;
  62         unsigned long           flags;
  63         int                     opened;
  64         int                     err;
  65
  66         bdaddr_t                src;
  67         bdaddr_t                dst;
  68         u8                      channel;
  69
  70         uint                    modem_status;
  71
  72         struct rfcomm_dlc       *dlc;
  73         struct tty_struct       *tty;
  74         wait_queue_head_t       wait;
  75         struct tasklet_struct   wakeup_task;
  76
  77         atomic_t                wmem_alloc;
  78 };
  79
  80 static LIST_HEAD(rfcomm_dev_list);
  81 static DEFINE_RWLOCK(rfcomm_dev_lock);
  82
  83 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
  84 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
  85 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
  86
  87 static void rfcomm_tty_wakeup(unsigned long arg);
  88
  89 /* ---- Device functions ---- */
  90 static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
  91 {
  92         struct rfcomm_dlc *dlc = dev->dlc;
  93
  94         BT_DBG("dev %p dlc %p", dev, dlc);
  95
  96         rfcomm_dlc_lock(dlc);
  97         /* Detach DLC if it's owned by this dev */
  98         if (dlc->owner == dev)
  99                 dlc->owner = NULL;
 100         rfcomm_dlc_unlock(dlc);
 101
 102         rfcomm_dlc_put(dlc);
 103
 104         tty_unregister_device(rfcomm_tty_driver, dev->id);
 105
 106         /* Refcount should only hit zero when called from rfcomm_dev_del()
 107            which will have taken us off the list. Everything else are
 108            refcounting bugs. */
 109         BUG_ON(!list_empty(&dev->list));
 110
 111         kfree(dev);
 112
 113         /* It's safe to call module_put() here because socket still
 114            holds reference to this module. */
 115         module_put(THIS_MODULE);
 116 }
 117
 118 static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
 119 {
 120         atomic_inc(&dev->refcnt);
 121 }
 122
 123 static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
 124 {
 125         /* The reason this isn't actually a race, as you no
 126            doubt have a little voice screaming at you in your
 127            head, is that the refcount should never actually
 128            reach zero unless the device has already been taken
 129            off the list, in rfcomm_dev_del(). And if that's not
 130            true, we'll hit the BUG() in rfcomm_dev_destruct()
 131            anyway. */
 132         if (atomic_dec_and_test(&dev->refcnt))
 133                 rfcomm_dev_destruct(dev);
 134 }
 135
 136 static struct rfcomm_dev *__rfcomm_dev_get(int id)
 137 {
 138         struct rfcomm_dev *dev;
 139         struct list_head  *p;
 140
 141         list_for_each(p, &rfcomm_dev_list) {
 142                 dev = list_entry(p, struct rfcomm_dev, list);
 143                 if (dev->id == id)
 144                         return dev;
 145         }
 146
 147         return NULL;
 148 }
 149
 150 static inline struct rfcomm_dev *rfcomm_dev_get(int id)
 151 {
 152         struct rfcomm_dev *dev;
 153
 154         read_lock(&rfcomm_dev_lock);
 155
 156         dev = __rfcomm_dev_get(id);
 157         if (dev)
 158                 rfcomm_dev_hold(dev);
 159
 160         read_unlock(&rfcomm_dev_lock);
 161
 162         return dev;
 163 }
 164
 165 static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
 166 {
 167         struct hci_dev *hdev;
 168         struct hci_conn *conn;
 169
 170         hdev = hci_get_route(&dev->dst, &dev->src);
 171         if (!hdev)
 172                 return NULL;
 173
 174         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
 175
 176         hci_dev_put(hdev);
 177
 178         return conn ? &conn->dev : NULL;
 179 }
 180
 181 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 182 {
 183         struct rfcomm_dev *dev;
 184         struct list_head *head = &rfcomm_dev_list, *p;
 185         int err = 0;
 186
 187         BT_DBG("id %d channel %d", req->dev_id, req->channel);
 188
 189         dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
 190         if (!dev)
 191                 return -ENOMEM;
 192
 193         write_lock_bh(&rfcomm_dev_lock);
 194
 195         if (req->dev_id < 0) {
 196                 dev->id = 0;
 197
 198                 list_for_each(p, &rfcomm_dev_list) {
 199                         if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
 200                                 break;
 201
 202                         dev->id++;
 203                         head = p;
 204                 }
 205         } else {
 206                 dev->id = req->dev_id;
 207
 208                 list_for_each(p, &rfcomm_dev_list) {
 209                         struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
 210
 211                         if (entry->id == dev->id) {
 212                                 err = -EADDRINUSE;
 213                                 goto out;
 214                         }
 215
 216                         if (entry->id > dev->id - 1)
 217                                 break;
 218
 219                         head = p;
 220                 }
 221         }
 222
 223         if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
 224                 err = -ENFILE;
 225                 goto out;
 226         }
 227
 228         sprintf(dev->name, "rfcomm%d", dev->id);
 229
 230         list_add(&dev->list, head);
 231         atomic_set(&dev->refcnt, 1);
 232
 233         bacpy(&dev->src, &req->src);
 234         bacpy(&dev->dst, &req->dst);
 235         dev->channel = req->channel;
 236
 237         dev->flags = req->flags &
 238                 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
 239
 240         init_waitqueue_head(&dev->wait);
 241         tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
 242
 243         rfcomm_dlc_lock(dlc);
 244         dlc->data_ready   = rfcomm_dev_data_ready;
 245         dlc->state_change = rfcomm_dev_state_change;
 246         dlc->modem_status = rfcomm_dev_modem_status;
 247
 248         dlc->owner = dev;
 249         dev->dlc   = dlc;
 250         rfcomm_dlc_unlock(dlc);
 251
 252         /* It's safe to call __module_get() here because socket already
 253            holds reference to this module. */
 254         __module_get(THIS_MODULE);
 255
 256 out:
 257         write_unlock_bh(&rfcomm_dev_lock);
 258
 259         if (err) {
 260                 kfree(dev);
 261                 return err;
 262         }
 263
 264         tty_register_device(rfcomm_tty_driver, dev->id, rfcomm_get_device(dev));
 265
 266         return dev->id;
 267 }
 268
 269 static void rfcomm_dev_del(struct rfcomm_dev *dev)
 270 {
 271         BT_DBG("dev %p", dev);
 272
 273         write_lock_bh(&rfcomm_dev_lock);
 274         list_del_init(&dev->list);
 275         write_unlock_bh(&rfcomm_dev_lock);
 276
 277         rfcomm_dev_put(dev);
 278 }
 279
 280 /* ---- Send buffer ---- */
 281 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
 282 {
 283         /* We can't let it be zero, because we don't get a callback
 284            when tx_credits becomes nonzero, hence we'd never wake up */
 285         return dlc->mtu * (dlc->tx_credits?:1);
 286 }
 287
 288 static void rfcomm_wfree(struct sk_buff *skb)
 289 {
 290         struct rfcomm_dev *dev = (void *) skb->sk;
 291         atomic_sub(skb->truesize, &dev->wmem_alloc);
 292         if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
 293                 tasklet_schedule(&dev->wakeup_task);
 294         rfcomm_dev_put(dev);
 295 }
 296
 297 static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
 298 {
 299         rfcomm_dev_hold(dev);
 300         atomic_add(skb->truesize, &dev->wmem_alloc);
 301         skb->sk = (void *) dev;
 302         skb->destructor = rfcomm_wfree;
 303 }
 304
 305 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
 306 {
 307         if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
 308                 struct sk_buff *skb = alloc_skb(size, priority);
 309                 if (skb) {
 310                         rfcomm_set_owner_w(skb, dev);
 311                         return skb;
 312                 }
 313         }
 314         return NULL;
 315 }
 316
 317 /* ---- Device IOCTLs ---- */
 318
 319 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
 320
 321 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
 322 {
 323         struct rfcomm_dev_req req;
 324         struct rfcomm_dlc *dlc;
 325         int id;
 326
 327         if (copy_from_user(&req, arg, sizeof(req)))
 328                 return -EFAULT;
 329
 330         BT_DBG("sk %p dev_id %id flags 0x%x", sk, req.dev_id, req.flags);
 331
 332         if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
 333                 return -EPERM;
 334
 335         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 336                 /* Socket must be connected */
 337                 if (sk->sk_state != BT_CONNECTED)
 338                         return -EBADFD;
 339
 340                 dlc = rfcomm_pi(sk)->dlc;
 341                 rfcomm_dlc_hold(dlc);
 342         } else {
 343                 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 344                 if (!dlc)
 345                         return -ENOMEM;
 346         }
 347
 348         id = rfcomm_dev_add(&req, dlc);
 349         if (id < 0) {
 350                 rfcomm_dlc_put(dlc);
 351                 return id;
 352         }
 353
 354         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 355                 /* DLC is now used by device.
 356                  * Socket must be disconnected */
 357                 sk->sk_state = BT_CLOSED;
 358         }
 359
 360         return id;
 361 }
 362
 363 static int rfcomm_release_dev(void __user *arg)
 364 {
 365         struct rfcomm_dev_req req;
 366         struct rfcomm_dev *dev;
 367
 368         if (copy_from_user(&req, arg, sizeof(req)))
 369                 return -EFAULT;
 370
 371         BT_DBG("dev_id %id flags 0x%x", req.dev_id, req.flags);
 372
 373         if (!(dev = rfcomm_dev_get(req.dev_id)))
 374                 return -ENODEV;
 375
 376         if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
 377                 rfcomm_dev_put(dev);
 378                 return -EPERM;
 379         }
 380
 381         if (req.flags & (1 << RFCOMM_HANGUP_NOW))
 382                 rfcomm_dlc_close(dev->dlc, 0);
 383
 384         rfcomm_dev_del(dev);
 385         rfcomm_dev_put(dev);
 386         return 0;
 387 }
 388
 389 static int rfcomm_get_dev_list(void __user *arg)
 390 {
 391         struct rfcomm_dev_list_req *dl;
 392         struct rfcomm_dev_info *di;
 393         struct list_head *p;
 394         int n = 0, size, err;
 395         u16 dev_num;
 396
 397         BT_DBG("");
 398
 399         if (get_user(dev_num, (u16 __user *) arg))
 400                 return -EFAULT;
 401
 402         if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
 403                 return -EINVAL;
 404
 405         size = sizeof(*dl) + dev_num * sizeof(*di);
 406
 407         if (!(dl = kmalloc(size, GFP_KERNEL)))
 408                 return -ENOMEM;
 409
 410         di = dl->dev_info;
 411
 412         read_lock_bh(&rfcomm_dev_lock);
 413
 414         list_for_each(p, &rfcomm_dev_list) {
 415                 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
 416                 (di + n)->id      = dev->id;
 417                 (di + n)->flags   = dev->flags;
 418                 (di + n)->state   = dev->dlc->state;
 419                 (di + n)->channel = dev->channel;
 420                 bacpy(&(di + n)->src, &dev->src);
 421                 bacpy(&(di + n)->dst, &dev->dst);
 422                 if (++n >= dev_num)
 423                         break;
 424         }
 425
 426         read_unlock_bh(&rfcomm_dev_lock);
 427
 428         dl->dev_num = n;
 429         size = sizeof(*dl) + n * sizeof(*di);
 430
 431         err = copy_to_user(arg, dl, size);
 432         kfree(dl);
 433
 434         return err ? -EFAULT : 0;
 435 }
 436
 437 static int rfcomm_get_dev_info(void __user *arg)
 438 {
 439         struct rfcomm_dev *dev;
 440         struct rfcomm_dev_info di;
 441         int err = 0;
 442
 443         BT_DBG("");
 444
 445         if (copy_from_user(&di, arg, sizeof(di)))
 446                 return -EFAULT;
 447
 448         if (!(dev = rfcomm_dev_get(di.id)))
 449                 return -ENODEV;
 450
 451         di.flags   = dev->flags;
 452         di.channel = dev->channel;
 453         di.state   = dev->dlc->state;
 454         bacpy(&di.src, &dev->src);
 455         bacpy(&di.dst, &dev->dst);
 456
 457         if (copy_to_user(arg, &di, sizeof(di)))
 458                 err = -EFAULT;
 459
 460         rfcomm_dev_put(dev);
 461         return err;
 462 }
 463
 464 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
 465 {
 466         BT_DBG("cmd %d arg %p", cmd, arg);
 467
 468         switch (cmd) {
 469         case RFCOMMCREATEDEV:
 470                 return rfcomm_create_dev(sk, arg);
 471
 472         case RFCOMMRELEASEDEV:
 473                 return rfcomm_release_dev(arg);
 474
 475         case RFCOMMGETDEVLIST:
 476                 return rfcomm_get_dev_list(arg);
 477
 478         case RFCOMMGETDEVINFO:
 479                 return rfcomm_get_dev_info(arg);
 480         }
 481
 482         return -EINVAL;
 483 }
 484
 485 /* ---- DLC callbacks ---- */
 486 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 487 {
 488         struct rfcomm_dev *dev = dlc->owner;
 489         struct tty_struct *tty;
 490
 491         if (!dev || !(tty = dev->tty)) {
 492                 kfree_skb(skb);
 493                 return;
 494         }
 495
 496         BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
 497
 498         tty_insert_flip_string(tty, skb->data, skb->len);
 499         tty_flip_buffer_push(tty);
 500
 501         kfree_skb(skb);
 502 }
 503
 504 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 505 {
 506         struct rfcomm_dev *dev = dlc->owner;
 507         if (!dev)
 508                 return;
 509
 510         BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
 511
 512         dev->err = err;
 513         wake_up_interruptible(&dev->wait);
 514
 515         if (dlc->state == BT_CLOSED) {
 516                 if (!dev->tty) {
 517                         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 518                                 rfcomm_dev_hold(dev);
 519                                 rfcomm_dev_del(dev);
 520
 521                                 /* We have to drop DLC lock here, otherwise
 522                                    rfcomm_dev_put() will dead lock if it's
 523                                    the last reference. */
 524                                 rfcomm_dlc_unlock(dlc);
 525                                 rfcomm_dev_put(dev);
 526                                 rfcomm_dlc_lock(dlc);
 527                         }
 528                 } else
 529                         tty_hangup(dev->tty);
 530         }
 531 }
 532
 533 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
 534 {
 535         struct rfcomm_dev *dev = dlc->owner;
 536         if (!dev)
 537                 return;
 538
 539         BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 540
 541         if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
 542                 if (dev->tty && !C_CLOCAL(dev->tty))
 543                         tty_hangup(dev->tty);
 544         }
 545
 546         dev->modem_status =
 547                 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
 548                 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
 549                 ((v24_sig & RFCOMM_V24_IC)  ? TIOCM_RI : 0) |
 550                 ((v24_sig & RFCOMM_V24_DV)  ? TIOCM_CD : 0);
 551 }
 552
 553 /* ---- TTY functions ---- */
 554 static void rfcomm_tty_wakeup(unsigned long arg)
 555 {
 556         struct rfcomm_dev *dev = (void *) arg;
 557         struct tty_struct *tty = dev->tty;
 558         if (!tty)
 559                 return;
 560
 561         BT_DBG("dev %p tty %p", dev, tty);
 562
 563         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 564                 (tty->ldisc.write_wakeup)(tty);
 565
 566         wake_up_interruptible(&tty->write_wait);
 567 #ifdef SERIAL_HAVE_POLL_WAIT
 568         wake_up_interruptible(&tty->poll_wait);
 569 #endif
 570 }
 571
 572 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 573 {
 574         DECLARE_WAITQUEUE(wait, current);
 575         struct rfcomm_dev *dev;
 576         struct rfcomm_dlc *dlc;
 577         int err, id;
 578
 579         id = tty->index;
 580
 581         BT_DBG("tty %p id %d", tty, id);
 582
 583         /* We don't leak this refcount. For reasons which are not entirely
 584            clear, the TTY layer will call our ->close() method even if the
 585            open fails. We decrease the refcount there, and decreasing it
 586            here too would cause breakage. */
 587         dev = rfcomm_dev_get(id);
 588         if (!dev)
 589                 return -ENODEV;
 590
 591         BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
 592
 593         if (dev->opened++ != 0)
 594                 return 0;
 595
 596         dlc = dev->dlc;
 597
 598         /* Attach TTY and open DLC */
 599
 600         rfcomm_dlc_lock(dlc);
 601         tty->driver_data = dev;
 602         dev->tty = tty;
 603         rfcomm_dlc_unlock(dlc);
 604         set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 605
 606         err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
 607         if (err < 0)
 608                 return err;
 609
 610         /* Wait for DLC to connect */
 611         add_wait_queue(&dev->wait, &wait);
 612         while (1) {
 613                 set_current_state(TASK_INTERRUPTIBLE);
 614
 615                 if (dlc->state == BT_CLOSED) {
 616                         err = -dev->err;
 617                         break;
 618                 }
 619
 620                 if (dlc->state == BT_CONNECTED)
 621                         break;
 622
 623                 if (signal_pending(current)) {
 624                         err = -EINTR;
 625                         break;
 626                 }
 627
 628                 schedule();
 629         }
 630         set_current_state(TASK_RUNNING);
 631         remove_wait_queue(&dev->wait, &wait);
 632
 633         return err;
 634 }
 635
 636 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
 637 {
 638         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 639         if (!dev)
 640                 return;
 641
 642         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
 643
 644         if (--dev->opened == 0) {
 645                 /* Close DLC and dettach TTY */
 646                 rfcomm_dlc_close(dev->dlc, 0);
 647
 648                 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 649                 tasklet_kill(&dev->wakeup_task);
 650
 651                 rfcomm_dlc_lock(dev->dlc);
 652                 tty->driver_data = NULL;
 653                 dev->tty = NULL;
 654                 rfcomm_dlc_unlock(dev->dlc);
 655         }
 656
 657         rfcomm_dev_put(dev);
 658 }
 659
 660 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 661 {
 662         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 663         struct rfcomm_dlc *dlc = dev->dlc;
 664         struct sk_buff *skb;
 665         int err = 0, sent = 0, size;
 666
 667         BT_DBG("tty %p count %d", tty, count);
 668
 669         while (count) {
 670                 size = min_t(uint, count, dlc->mtu);
 671
 672                 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
 673
 674                 if (!skb)
 675                         break;
 676
 677                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 678
 679                 memcpy(skb_put(skb, size), buf + sent, size);
 680
 681                 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
 682                         kfree_skb(skb);
 683                         break;
 684                 }
 685
 686                 sent  += size;
 687                 count -= size;
 688         }
 689
 690         return sent ? sent : err;
 691 }
 692
 693 static int rfcomm_tty_write_room(struct tty_struct *tty)
 694 {
 695         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 696         int room;
 697
 698         BT_DBG("tty %p", tty);
 699
 700         room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
 701         if (room < 0)
 702                 room = 0;
 703         return room;
 704 }
 705
 706 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
 707 {
 708         BT_DBG("tty %p cmd 0x%02x", tty, cmd);
 709
 710         switch (cmd) {
 711         case TCGETS:
 712                 BT_DBG("TCGETS is not supported");
 713                 return -ENOIOCTLCMD;
 714
 715         case TCSETS:
 716                 BT_DBG("TCSETS is not supported");
 717                 return -ENOIOCTLCMD;
 718
 719         case TIOCMIWAIT:
 720                 BT_DBG("TIOCMIWAIT");
 721                 break;
 722
 723         case TIOCGICOUNT:
 724                 BT_DBG("TIOCGICOUNT");
 725                 break;
 726
 727         case TIOCGSERIAL:
 728                 BT_ERR("TIOCGSERIAL is not supported");
 729                 return -ENOIOCTLCMD;
 730
 731         case TIOCSSERIAL:
 732                 BT_ERR("TIOCSSERIAL is not supported");
 733                 return -ENOIOCTLCMD;
 734
 735         case TIOCSERGSTRUCT:
 736                 BT_ERR("TIOCSERGSTRUCT is not supported");
 737                 return -ENOIOCTLCMD;
 738
 739         case TIOCSERGETLSR:
 740                 BT_ERR("TIOCSERGETLSR is not supported");
 741                 return -ENOIOCTLCMD;
 742
 743         case TIOCSERCONFIG:
 744                 BT_ERR("TIOCSERCONFIG is not supported");
 745                 return -ENOIOCTLCMD;
 746
 747         default:
 748                 return -ENOIOCTLCMD;    /* ioctls which we must ignore */
 749
 750         }
 751
 752         return -ENOIOCTLCMD;
 753 }
 754
 755 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 756 {
 757         struct ktermios *new = tty->termios;
 758         int old_baud_rate = tty_termios_baud_rate(old);
 759         int new_baud_rate = tty_termios_baud_rate(new);
 760
 761         u8 baud, data_bits, stop_bits, parity, x_on, x_off;
 762         u16 changes = 0;
 763
 764         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 765
 766         BT_DBG("tty %p termios %p", tty, old);
 767
 768         if (!dev || !dev->dlc || !dev->dlc->session)
 769                 return;
 770
 771         /* Handle turning off CRTSCTS */
 772         if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
 773                 BT_DBG("Turning off CRTSCTS unsupported");
 774
 775         /* Parity on/off and when on, odd/even */
 776         if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
 777                         ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
 778                 changes |= RFCOMM_RPN_PM_PARITY;
 779                 BT_DBG("Parity change detected.");
 780         }
 781
 782         /* Mark and space parity are not supported! */
 783         if (new->c_cflag & PARENB) {
 784                 if (new->c_cflag & PARODD) {
 785                         BT_DBG("Parity is ODD");
 786                         parity = RFCOMM_RPN_PARITY_ODD;
 787                 } else {
 788                         BT_DBG("Parity is EVEN");
 789                         parity = RFCOMM_RPN_PARITY_EVEN;
 790                 }
 791         } else {
 792                 BT_DBG("Parity is OFF");
 793                 parity = RFCOMM_RPN_PARITY_NONE;
 794         }
 795
 796         /* Setting the x_on / x_off characters */
 797         if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
 798                 BT_DBG("XOFF custom");
 799                 x_on = new->c_cc[VSTOP];
 800                 changes |= RFCOMM_RPN_PM_XON;
 801         } else {
 802                 BT_DBG("XOFF default");
 803                 x_on = RFCOMM_RPN_XON_CHAR;
 804         }
 805
 806         if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
 807                 BT_DBG("XON custom");
 808                 x_off = new->c_cc[VSTART];
 809                 changes |= RFCOMM_RPN_PM_XOFF;
 810         } else {
 811                 BT_DBG("XON default");
 812                 x_off = RFCOMM_RPN_XOFF_CHAR;
 813         }
 814
 815         /* Handle setting of stop bits */
 816         if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
 817                 changes |= RFCOMM_RPN_PM_STOP;
 818
 819         /* POSIX does not support 1.5 stop bits and RFCOMM does not
 820          * support 2 stop bits. So a request for 2 stop bits gets
 821          * translated to 1.5 stop bits */
 822         if (new->c_cflag & CSTOPB) {
 823                 stop_bits = RFCOMM_RPN_STOP_15;
 824         } else {
 825                 stop_bits = RFCOMM_RPN_STOP_1;
 826         }
 827
 828         /* Handle number of data bits [5-8] */
 829         if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
 830                 changes |= RFCOMM_RPN_PM_DATA;
 831
 832         switch (new->c_cflag & CSIZE) {
 833         case CS5:
 834                 data_bits = RFCOMM_RPN_DATA_5;
 835                 break;
 836         case CS6:
 837                 data_bits = RFCOMM_RPN_DATA_6;
 838                 break;
 839         case CS7:
 840                 data_bits = RFCOMM_RPN_DATA_7;
 841                 break;
 842         case CS8:
 843                 data_bits = RFCOMM_RPN_DATA_8;
 844                 break;
 845         default:
 846                 data_bits = RFCOMM_RPN_DATA_8;
 847                 break;
 848         }
 849
 850         /* Handle baudrate settings */
 851         if (old_baud_rate != new_baud_rate)
 852                 changes |= RFCOMM_RPN_PM_BITRATE;
 853
 854         switch (new_baud_rate) {
 855         case 2400:
 856                 baud = RFCOMM_RPN_BR_2400;
 857                 break;
 858         case 4800:
 859                 baud = RFCOMM_RPN_BR_4800;
 860                 break;
 861         case 7200:
 862                 baud = RFCOMM_RPN_BR_7200;
 863                 break;
 864         case 9600:
 865                 baud = RFCOMM_RPN_BR_9600;
 866                 break;
 867         case 19200:
 868                 baud = RFCOMM_RPN_BR_19200;
 869                 break;
 870         case 38400:
 871                 baud = RFCOMM_RPN_BR_38400;
 872                 break;
 873         case 57600:
 874                 baud = RFCOMM_RPN_BR_57600;
 875                 break;
 876         case 115200:
 877                 baud = RFCOMM_RPN_BR_115200;
 878                 break;
 879         case 230400:
 880                 baud = RFCOMM_RPN_BR_230400;
 881                 break;
 882         default:
 883                 /* 9600 is standard accordinag to the RFCOMM specification */
 884                 baud = RFCOMM_RPN_BR_9600;
 885                 break;
 886
 887         }
 888
 889         if (changes)
 890                 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
 891                                 data_bits, stop_bits, parity,
 892                                 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
 893
 894         return;
 895 }
 896
 897 static void rfcomm_tty_throttle(struct tty_struct *tty)
 898 {
 899         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 900
 901         BT_DBG("tty %p dev %p", tty, dev);
 902
 903         rfcomm_dlc_throttle(dev->dlc);
 904 }
 905
 906 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
 907 {
 908         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 909
 910         BT_DBG("tty %p dev %p", tty, dev);
 911
 912         rfcomm_dlc_unthrottle(dev->dlc);
 913 }
 914
 915 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 916 {
 917         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 918         struct rfcomm_dlc *dlc = dev->dlc;
 919
 920         BT_DBG("tty %p dev %p", tty, dev);
 921
 922         if (!skb_queue_empty(&dlc->tx_queue))
 923                 return dlc->mtu;
 924
 925         return 0;
 926 }
 927
 928 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
 929 {
 930         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 931         if (!dev)
 932                 return;
 933
 934         BT_DBG("tty %p dev %p", tty, dev);
 935
 936         skb_queue_purge(&dev->dlc->tx_queue);
 937
 938         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 939                 tty->ldisc.write_wakeup(tty);
 940 }
 941
 942 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
 943 {
 944         BT_DBG("tty %p ch %c", tty, ch);
 945 }
 946
 947 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 948 {
 949         BT_DBG("tty %p timeout %d", tty, timeout);
 950 }
 951
 952 static void rfcomm_tty_hangup(struct tty_struct *tty)
 953 {
 954         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 955         if (!dev)
 956                 return;
 957
 958         BT_DBG("tty %p dev %p", tty, dev);
 959
 960         rfcomm_tty_flush_buffer(tty);
 961
 962         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
 963                 rfcomm_dev_del(dev);
 964 }
 965
 966 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
 967 {
 968         return 0;
 969 }
 970
 971 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
 972 {
 973         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 974
 975         BT_DBG("tty %p dev %p", tty, dev);
 976
 977         return dev->modem_status;
 978 }
 979
 980 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
 981 {
 982         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 983         struct rfcomm_dlc *dlc = dev->dlc;
 984         u8 v24_sig;
 985
 986         BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
 987
 988         rfcomm_dlc_get_modem_status(dlc, &v24_sig);
 989
 990         if (set & TIOCM_DSR || set & TIOCM_DTR)
 991                 v24_sig |= RFCOMM_V24_RTC;
 992         if (set & TIOCM_RTS || set & TIOCM_CTS)
 993                 v24_sig |= RFCOMM_V24_RTR;
 994         if (set & TIOCM_RI)
 995                 v24_sig |= RFCOMM_V24_IC;
 996         if (set & TIOCM_CD)
 997                 v24_sig |= RFCOMM_V24_DV;
 998
 999         if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1000                 v24_sig &= ~RFCOMM_V24_RTC;
1001         if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1002                 v24_sig &= ~RFCOMM_V24_RTR;
1003         if (clear & TIOCM_RI)
1004                 v24_sig &= ~RFCOMM_V24_IC;
1005         if (clear & TIOCM_CD)
1006                 v24_sig &= ~RFCOMM_V24_DV;
1007
1008         rfcomm_dlc_set_modem_status(dlc, v24_sig);
1009
1010         return 0;
1011 }
1012
1013 /* ---- TTY structure ---- */
1014
1015 static const struct tty_operations rfcomm_ops = {
1016         .open                   = rfcomm_tty_open,
1017         .close                  = rfcomm_tty_close,
1018         .write                  = rfcomm_tty_write,
1019         .write_room             = rfcomm_tty_write_room,
1020         .chars_in_buffer        = rfcomm_tty_chars_in_buffer,
1021         .flush_buffer           = rfcomm_tty_flush_buffer,
1022         .ioctl                  = rfcomm_tty_ioctl,
1023         .throttle               = rfcomm_tty_throttle,
1024         .unthrottle             = rfcomm_tty_unthrottle,
1025         .set_termios            = rfcomm_tty_set_termios,
1026         .send_xchar             = rfcomm_tty_send_xchar,
1027         .hangup                 = rfcomm_tty_hangup,
1028         .wait_until_sent        = rfcomm_tty_wait_until_sent,
1029         .read_proc              = rfcomm_tty_read_proc,
1030         .tiocmget               = rfcomm_tty_tiocmget,
1031         .tiocmset               = rfcomm_tty_tiocmset,
1032 };
1033
1034 int rfcomm_init_ttys(void)
1035 {
1036         rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1037         if (!rfcomm_tty_driver)
1038                 return -1;
1039
1040         rfcomm_tty_driver->owner        = THIS_MODULE;
1041         rfcomm_tty_driver->driver_name  = "rfcomm";
1042         rfcomm_tty_driver->name         = "rfcomm";
1043         rfcomm_tty_driver->major        = RFCOMM_TTY_MAJOR;
1044         rfcomm_tty_driver->minor_start  = RFCOMM_TTY_MINOR;
1045         rfcomm_tty_driver->type         = TTY_DRIVER_TYPE_SERIAL;
1046         rfcomm_tty_driver->subtype      = SERIAL_TYPE_NORMAL;
1047         rfcomm_tty_driver->flags        = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1048         rfcomm_tty_driver->init_termios = tty_std_termios;
1049         rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1050         tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1051
1052         if (tty_register_driver(rfcomm_tty_driver)) {
1053                 BT_ERR("Can't register RFCOMM TTY driver");
1054                 put_tty_driver(rfcomm_tty_driver);
1055                 return -1;
1056         }
1057
1058         BT_INFO("RFCOMM TTY layer initialized");
1059
1060         return 0;
1061 }
1062
1063 void rfcomm_cleanup_ttys(void)
1064 {
1065         tty_unregister_driver(rfcomm_tty_driver);
1066         put_tty_driver(rfcomm_tty_driver);
1067 }