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   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         struct device           *tty_dev;
  78
  79         atomic_t                wmem_alloc;
  80 };
  81
  82 static LIST_HEAD(rfcomm_dev_list);
  83 static DEFINE_RWLOCK(rfcomm_dev_lock);
  84
  85 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
  86 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
  87 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
  88
  89 static void rfcomm_tty_wakeup(unsigned long arg);
  90
  91 /* ---- Device functions ---- */
  92 static void rfcomm_dev_destruct(struct rfcomm_dev *dev)
  93 {
  94         struct rfcomm_dlc *dlc = dev->dlc;
  95
  96         BT_DBG("dev %p dlc %p", dev, dlc);
  97
  98         write_lock_bh(&rfcomm_dev_lock);
  99         list_del_init(&dev->list);
 100         write_unlock_bh(&rfcomm_dev_lock);
 101
 102         rfcomm_dlc_lock(dlc);
 103         /* Detach DLC if it's owned by this dev */
 104         if (dlc->owner == dev)
 105                 dlc->owner = NULL;
 106         rfcomm_dlc_unlock(dlc);
 107
 108         rfcomm_dlc_put(dlc);
 109
 110         tty_unregister_device(rfcomm_tty_driver, dev->id);
 111
 112         /* Refcount should only hit zero when called from rfcomm_dev_del()
 113            which will have taken us off the list. Everything else are
 114            refcounting bugs. */
 115         BUG_ON(!list_empty(&dev->list));
 116
 117         kfree(dev);
 118
 119         /* It's safe to call module_put() here because socket still
 120            holds reference to this module. */
 121         module_put(THIS_MODULE);
 122 }
 123
 124 static inline void rfcomm_dev_hold(struct rfcomm_dev *dev)
 125 {
 126         atomic_inc(&dev->refcnt);
 127 }
 128
 129 static inline void rfcomm_dev_put(struct rfcomm_dev *dev)
 130 {
 131         /* The reason this isn't actually a race, as you no
 132            doubt have a little voice screaming at you in your
 133            head, is that the refcount should never actually
 134            reach zero unless the device has already been taken
 135            off the list, in rfcomm_dev_del(). And if that's not
 136            true, we'll hit the BUG() in rfcomm_dev_destruct()
 137            anyway. */
 138         if (atomic_dec_and_test(&dev->refcnt))
 139                 rfcomm_dev_destruct(dev);
 140 }
 141
 142 static struct rfcomm_dev *__rfcomm_dev_get(int id)
 143 {
 144         struct rfcomm_dev *dev;
 145         struct list_head  *p;
 146
 147         list_for_each(p, &rfcomm_dev_list) {
 148                 dev = list_entry(p, struct rfcomm_dev, list);
 149                 if (dev->id == id)
 150                         return dev;
 151         }
 152
 153         return NULL;
 154 }
 155
 156 static inline struct rfcomm_dev *rfcomm_dev_get(int id)
 157 {
 158         struct rfcomm_dev *dev;
 159
 160         read_lock(&rfcomm_dev_lock);
 161
 162         dev = __rfcomm_dev_get(id);
 163
 164         if (dev) {
 165                 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
 166                         dev = NULL;
 167                 else
 168                         rfcomm_dev_hold(dev);
 169         }
 170
 171         read_unlock(&rfcomm_dev_lock);
 172
 173         return dev;
 174 }
 175
 176 static struct device *rfcomm_get_device(struct rfcomm_dev *dev)
 177 {
 178         struct hci_dev *hdev;
 179         struct hci_conn *conn;
 180
 181         hdev = hci_get_route(&dev->dst, &dev->src);
 182         if (!hdev)
 183                 return NULL;
 184
 185         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
 186
 187         hci_dev_put(hdev);
 188
 189         return conn ? &conn->dev : NULL;
 190 }
 191
 192 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 193 {
 194         struct rfcomm_dev *dev;
 195         struct list_head *head = &rfcomm_dev_list, *p;
 196         int err = 0;
 197
 198         BT_DBG("id %d channel %d", req->dev_id, req->channel);
 199
 200         dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
 201         if (!dev)
 202                 return -ENOMEM;
 203
 204         write_lock_bh(&rfcomm_dev_lock);
 205
 206         if (req->dev_id < 0) {
 207                 dev->id = 0;
 208
 209                 list_for_each(p, &rfcomm_dev_list) {
 210                         if (list_entry(p, struct rfcomm_dev, list)->id != dev->id)
 211                                 break;
 212
 213                         dev->id++;
 214                         head = p;
 215                 }
 216         } else {
 217                 dev->id = req->dev_id;
 218
 219                 list_for_each(p, &rfcomm_dev_list) {
 220                         struct rfcomm_dev *entry = list_entry(p, struct rfcomm_dev, list);
 221
 222                         if (entry->id == dev->id) {
 223                                 err = -EADDRINUSE;
 224                                 goto out;
 225                         }
 226
 227                         if (entry->id > dev->id - 1)
 228                                 break;
 229
 230                         head = p;
 231                 }
 232         }
 233
 234         if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
 235                 err = -ENFILE;
 236                 goto out;
 237         }
 238
 239         sprintf(dev->name, "rfcomm%d", dev->id);
 240
 241         list_add(&dev->list, head);
 242         atomic_set(&dev->refcnt, 1);
 243
 244         bacpy(&dev->src, &req->src);
 245         bacpy(&dev->dst, &req->dst);
 246         dev->channel = req->channel;
 247
 248         dev->flags = req->flags &
 249                 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
 250
 251         init_waitqueue_head(&dev->wait);
 252         tasklet_init(&dev->wakeup_task, rfcomm_tty_wakeup, (unsigned long) dev);
 253
 254         rfcomm_dlc_lock(dlc);
 255         dlc->data_ready   = rfcomm_dev_data_ready;
 256         dlc->state_change = rfcomm_dev_state_change;
 257         dlc->modem_status = rfcomm_dev_modem_status;
 258
 259         dlc->owner = dev;
 260         dev->dlc   = dlc;
 261         rfcomm_dlc_unlock(dlc);
 262
 263         /* It's safe to call __module_get() here because socket already
 264            holds reference to this module. */
 265         __module_get(THIS_MODULE);
 266
 267 out:
 268         write_unlock_bh(&rfcomm_dev_lock);
 269
 270         if (err) {
 271                 kfree(dev);
 272                 return err;
 273         }
 274
 275         dev->tty_dev = tty_register_device(rfcomm_tty_driver, dev->id, NULL);
 276
 277         if (IS_ERR(dev->tty_dev)) {
 278                 list_del(&dev->list);
 279                 kfree(dev);
 280                 return PTR_ERR(dev->tty_dev);
 281         }
 282
 283         return dev->id;
 284 }
 285
 286 static void rfcomm_dev_del(struct rfcomm_dev *dev)
 287 {
 288         BT_DBG("dev %p", dev);
 289
 290         set_bit(RFCOMM_TTY_RELEASED, &dev->flags);
 291         rfcomm_dev_put(dev);
 292 }
 293
 294 /* ---- Send buffer ---- */
 295 static inline unsigned int rfcomm_room(struct rfcomm_dlc *dlc)
 296 {
 297         /* We can't let it be zero, because we don't get a callback
 298            when tx_credits becomes nonzero, hence we'd never wake up */
 299         return dlc->mtu * (dlc->tx_credits?:1);
 300 }
 301
 302 static void rfcomm_wfree(struct sk_buff *skb)
 303 {
 304         struct rfcomm_dev *dev = (void *) skb->sk;
 305         atomic_sub(skb->truesize, &dev->wmem_alloc);
 306         if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
 307                 tasklet_schedule(&dev->wakeup_task);
 308         rfcomm_dev_put(dev);
 309 }
 310
 311 static inline void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
 312 {
 313         rfcomm_dev_hold(dev);
 314         atomic_add(skb->truesize, &dev->wmem_alloc);
 315         skb->sk = (void *) dev;
 316         skb->destructor = rfcomm_wfree;
 317 }
 318
 319 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
 320 {
 321         if (atomic_read(&dev->wmem_alloc) < rfcomm_room(dev->dlc)) {
 322                 struct sk_buff *skb = alloc_skb(size, priority);
 323                 if (skb) {
 324                         rfcomm_set_owner_w(skb, dev);
 325                         return skb;
 326                 }
 327         }
 328         return NULL;
 329 }
 330
 331 /* ---- Device IOCTLs ---- */
 332
 333 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
 334
 335 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
 336 {
 337         struct rfcomm_dev_req req;
 338         struct rfcomm_dlc *dlc;
 339         int id;
 340
 341         if (copy_from_user(&req, arg, sizeof(req)))
 342                 return -EFAULT;
 343
 344         BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
 345
 346         if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
 347                 return -EPERM;
 348
 349         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 350                 /* Socket must be connected */
 351                 if (sk->sk_state != BT_CONNECTED)
 352                         return -EBADFD;
 353
 354                 dlc = rfcomm_pi(sk)->dlc;
 355                 rfcomm_dlc_hold(dlc);
 356         } else {
 357                 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 358                 if (!dlc)
 359                         return -ENOMEM;
 360         }
 361
 362         id = rfcomm_dev_add(&req, dlc);
 363         if (id < 0) {
 364                 rfcomm_dlc_put(dlc);
 365                 return id;
 366         }
 367
 368         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 369                 /* DLC is now used by device.
 370                  * Socket must be disconnected */
 371                 sk->sk_state = BT_CLOSED;
 372         }
 373
 374         return id;
 375 }
 376
 377 static int rfcomm_release_dev(void __user *arg)
 378 {
 379         struct rfcomm_dev_req req;
 380         struct rfcomm_dev *dev;
 381
 382         if (copy_from_user(&req, arg, sizeof(req)))
 383                 return -EFAULT;
 384
 385         BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
 386
 387         if (!(dev = rfcomm_dev_get(req.dev_id)))
 388                 return -ENODEV;
 389
 390         if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
 391                 rfcomm_dev_put(dev);
 392                 return -EPERM;
 393         }
 394
 395         if (req.flags & (1 << RFCOMM_HANGUP_NOW))
 396                 rfcomm_dlc_close(dev->dlc, 0);
 397
 398         /* Shut down TTY synchronously before freeing rfcomm_dev */
 399         if (dev->tty)
 400                 tty_vhangup(dev->tty);
 401
 402         rfcomm_dev_del(dev);
 403         rfcomm_dev_put(dev);
 404         return 0;
 405 }
 406
 407 static int rfcomm_get_dev_list(void __user *arg)
 408 {
 409         struct rfcomm_dev_list_req *dl;
 410         struct rfcomm_dev_info *di;
 411         struct list_head *p;
 412         int n = 0, size, err;
 413         u16 dev_num;
 414
 415         BT_DBG("");
 416
 417         if (get_user(dev_num, (u16 __user *) arg))
 418                 return -EFAULT;
 419
 420         if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
 421                 return -EINVAL;
 422
 423         size = sizeof(*dl) + dev_num * sizeof(*di);
 424
 425         if (!(dl = kmalloc(size, GFP_KERNEL)))
 426                 return -ENOMEM;
 427
 428         di = dl->dev_info;
 429
 430         read_lock_bh(&rfcomm_dev_lock);
 431
 432         list_for_each(p, &rfcomm_dev_list) {
 433                 struct rfcomm_dev *dev = list_entry(p, struct rfcomm_dev, list);
 434                 if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
 435                         continue;
 436                 (di + n)->id      = dev->id;
 437                 (di + n)->flags   = dev->flags;
 438                 (di + n)->state   = dev->dlc->state;
 439                 (di + n)->channel = dev->channel;
 440                 bacpy(&(di + n)->src, &dev->src);
 441                 bacpy(&(di + n)->dst, &dev->dst);
 442                 if (++n >= dev_num)
 443                         break;
 444         }
 445
 446         read_unlock_bh(&rfcomm_dev_lock);
 447
 448         dl->dev_num = n;
 449         size = sizeof(*dl) + n * sizeof(*di);
 450
 451         err = copy_to_user(arg, dl, size);
 452         kfree(dl);
 453
 454         return err ? -EFAULT : 0;
 455 }
 456
 457 static int rfcomm_get_dev_info(void __user *arg)
 458 {
 459         struct rfcomm_dev *dev;
 460         struct rfcomm_dev_info di;
 461         int err = 0;
 462
 463         BT_DBG("");
 464
 465         if (copy_from_user(&di, arg, sizeof(di)))
 466                 return -EFAULT;
 467
 468         if (!(dev = rfcomm_dev_get(di.id)))
 469                 return -ENODEV;
 470
 471         di.flags   = dev->flags;
 472         di.channel = dev->channel;
 473         di.state   = dev->dlc->state;
 474         bacpy(&di.src, &dev->src);
 475         bacpy(&di.dst, &dev->dst);
 476
 477         if (copy_to_user(arg, &di, sizeof(di)))
 478                 err = -EFAULT;
 479
 480         rfcomm_dev_put(dev);
 481         return err;
 482 }
 483
 484 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
 485 {
 486         BT_DBG("cmd %d arg %p", cmd, arg);
 487
 488         switch (cmd) {
 489         case RFCOMMCREATEDEV:
 490                 return rfcomm_create_dev(sk, arg);
 491
 492         case RFCOMMRELEASEDEV:
 493                 return rfcomm_release_dev(arg);
 494
 495         case RFCOMMGETDEVLIST:
 496                 return rfcomm_get_dev_list(arg);
 497
 498         case RFCOMMGETDEVINFO:
 499                 return rfcomm_get_dev_info(arg);
 500         }
 501
 502         return -EINVAL;
 503 }
 504
 505 /* ---- DLC callbacks ---- */
 506 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 507 {
 508         struct rfcomm_dev *dev = dlc->owner;
 509         struct tty_struct *tty;
 510
 511         if (!dev || !(tty = dev->tty)) {
 512                 kfree_skb(skb);
 513                 return;
 514         }
 515
 516         BT_DBG("dlc %p tty %p len %d", dlc, tty, skb->len);
 517
 518         tty_insert_flip_string(tty, skb->data, skb->len);
 519         tty_flip_buffer_push(tty);
 520
 521         kfree_skb(skb);
 522 }
 523
 524 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 525 {
 526         struct rfcomm_dev *dev = dlc->owner;
 527         if (!dev)
 528                 return;
 529
 530         BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
 531
 532         dev->err = err;
 533         wake_up_interruptible(&dev->wait);
 534
 535         if (dlc->state == BT_CLOSED) {
 536                 if (!dev->tty) {
 537                         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 538                                 if (rfcomm_dev_get(dev->id) == NULL)
 539                                         return;
 540
 541                                 rfcomm_dev_del(dev);
 542                                 /* We have to drop DLC lock here, otherwise
 543                                    rfcomm_dev_put() will dead lock if it's
 544                                    the last reference. */
 545                                 rfcomm_dlc_unlock(dlc);
 546                                 rfcomm_dev_put(dev);
 547                                 rfcomm_dlc_lock(dlc);
 548                         }
 549                 } else
 550                         tty_hangup(dev->tty);
 551         }
 552 }
 553
 554 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
 555 {
 556         struct rfcomm_dev *dev = dlc->owner;
 557         if (!dev)
 558                 return;
 559
 560         BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 561
 562         if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
 563                 if (dev->tty && !C_CLOCAL(dev->tty))
 564                         tty_hangup(dev->tty);
 565         }
 566
 567         dev->modem_status =
 568                 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
 569                 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
 570                 ((v24_sig & RFCOMM_V24_IC)  ? TIOCM_RI : 0) |
 571                 ((v24_sig & RFCOMM_V24_DV)  ? TIOCM_CD : 0);
 572 }
 573
 574 /* ---- TTY functions ---- */
 575 static void rfcomm_tty_wakeup(unsigned long arg)
 576 {
 577         struct rfcomm_dev *dev = (void *) arg;
 578         struct tty_struct *tty = dev->tty;
 579         if (!tty)
 580                 return;
 581
 582         BT_DBG("dev %p tty %p", dev, tty);
 583
 584         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 585                 (tty->ldisc.write_wakeup)(tty);
 586
 587         wake_up_interruptible(&tty->write_wait);
 588 #ifdef SERIAL_HAVE_POLL_WAIT
 589         wake_up_interruptible(&tty->poll_wait);
 590 #endif
 591 }
 592
 593 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 594 {
 595         DECLARE_WAITQUEUE(wait, current);
 596         struct rfcomm_dev *dev;
 597         struct rfcomm_dlc *dlc;
 598         int err, id;
 599
 600         id = tty->index;
 601
 602         BT_DBG("tty %p id %d", tty, id);
 603
 604         /* We don't leak this refcount. For reasons which are not entirely
 605            clear, the TTY layer will call our ->close() method even if the
 606            open fails. We decrease the refcount there, and decreasing it
 607            here too would cause breakage. */
 608         dev = rfcomm_dev_get(id);
 609         if (!dev)
 610                 return -ENODEV;
 611
 612         BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
 613
 614         if (dev->opened++ != 0)
 615                 return 0;
 616
 617         dlc = dev->dlc;
 618
 619         /* Attach TTY and open DLC */
 620
 621         rfcomm_dlc_lock(dlc);
 622         tty->driver_data = dev;
 623         dev->tty = tty;
 624         rfcomm_dlc_unlock(dlc);
 625         set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 626
 627         err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
 628         if (err < 0)
 629                 return err;
 630
 631         /* Wait for DLC to connect */
 632         add_wait_queue(&dev->wait, &wait);
 633         while (1) {
 634                 set_current_state(TASK_INTERRUPTIBLE);
 635
 636                 if (dlc->state == BT_CLOSED) {
 637                         err = -dev->err;
 638                         break;
 639                 }
 640
 641                 if (dlc->state == BT_CONNECTED)
 642                         break;
 643
 644                 if (signal_pending(current)) {
 645                         err = -EINTR;
 646                         break;
 647                 }
 648
 649                 schedule();
 650         }
 651         set_current_state(TASK_RUNNING);
 652         remove_wait_queue(&dev->wait, &wait);
 653
 654         if (err == 0)
 655                 device_move(dev->tty_dev, rfcomm_get_device(dev));
 656
 657         return err;
 658 }
 659
 660 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
 661 {
 662         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 663         if (!dev)
 664                 return;
 665
 666         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
 667
 668         if (--dev->opened == 0) {
 669                 device_move(dev->tty_dev, NULL);
 670
 671                 /* Close DLC and dettach TTY */
 672                 rfcomm_dlc_close(dev->dlc, 0);
 673
 674                 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 675                 tasklet_kill(&dev->wakeup_task);
 676
 677                 rfcomm_dlc_lock(dev->dlc);
 678                 tty->driver_data = NULL;
 679                 dev->tty = NULL;
 680                 rfcomm_dlc_unlock(dev->dlc);
 681         }
 682
 683         rfcomm_dev_put(dev);
 684 }
 685
 686 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 687 {
 688         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 689         struct rfcomm_dlc *dlc = dev->dlc;
 690         struct sk_buff *skb;
 691         int err = 0, sent = 0, size;
 692
 693         BT_DBG("tty %p count %d", tty, count);
 694
 695         while (count) {
 696                 size = min_t(uint, count, dlc->mtu);
 697
 698                 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
 699
 700                 if (!skb)
 701                         break;
 702
 703                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 704
 705                 memcpy(skb_put(skb, size), buf + sent, size);
 706
 707                 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
 708                         kfree_skb(skb);
 709                         break;
 710                 }
 711
 712                 sent  += size;
 713                 count -= size;
 714         }
 715
 716         return sent ? sent : err;
 717 }
 718
 719 static int rfcomm_tty_write_room(struct tty_struct *tty)
 720 {
 721         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 722         int room;
 723
 724         BT_DBG("tty %p", tty);
 725
 726         if (!dev || !dev->dlc)
 727                 return 0;
 728
 729         room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
 730         if (room < 0)
 731                 room = 0;
 732
 733         return room;
 734 }
 735
 736 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
 737 {
 738         BT_DBG("tty %p cmd 0x%02x", tty, cmd);
 739
 740         switch (cmd) {
 741         case TCGETS:
 742                 BT_DBG("TCGETS is not supported");
 743                 return -ENOIOCTLCMD;
 744
 745         case TCSETS:
 746                 BT_DBG("TCSETS is not supported");
 747                 return -ENOIOCTLCMD;
 748
 749         case TIOCMIWAIT:
 750                 BT_DBG("TIOCMIWAIT");
 751                 break;
 752
 753         case TIOCGICOUNT:
 754                 BT_DBG("TIOCGICOUNT");
 755                 break;
 756
 757         case TIOCGSERIAL:
 758                 BT_ERR("TIOCGSERIAL is not supported");
 759                 return -ENOIOCTLCMD;
 760
 761         case TIOCSSERIAL:
 762                 BT_ERR("TIOCSSERIAL is not supported");
 763                 return -ENOIOCTLCMD;
 764
 765         case TIOCSERGSTRUCT:
 766                 BT_ERR("TIOCSERGSTRUCT is not supported");
 767                 return -ENOIOCTLCMD;
 768
 769         case TIOCSERGETLSR:
 770                 BT_ERR("TIOCSERGETLSR is not supported");
 771                 return -ENOIOCTLCMD;
 772
 773         case TIOCSERCONFIG:
 774                 BT_ERR("TIOCSERCONFIG is not supported");
 775                 return -ENOIOCTLCMD;
 776
 777         default:
 778                 return -ENOIOCTLCMD;    /* ioctls which we must ignore */
 779
 780         }
 781
 782         return -ENOIOCTLCMD;
 783 }
 784
 785 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 786 {
 787         struct ktermios *new = tty->termios;
 788         int old_baud_rate = tty_termios_baud_rate(old);
 789         int new_baud_rate = tty_termios_baud_rate(new);
 790
 791         u8 baud, data_bits, stop_bits, parity, x_on, x_off;
 792         u16 changes = 0;
 793
 794         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 795
 796         BT_DBG("tty %p termios %p", tty, old);
 797
 798         if (!dev || !dev->dlc || !dev->dlc->session)
 799                 return;
 800
 801         /* Handle turning off CRTSCTS */
 802         if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
 803                 BT_DBG("Turning off CRTSCTS unsupported");
 804
 805         /* Parity on/off and when on, odd/even */
 806         if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
 807                         ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
 808                 changes |= RFCOMM_RPN_PM_PARITY;
 809                 BT_DBG("Parity change detected.");
 810         }
 811
 812         /* Mark and space parity are not supported! */
 813         if (new->c_cflag & PARENB) {
 814                 if (new->c_cflag & PARODD) {
 815                         BT_DBG("Parity is ODD");
 816                         parity = RFCOMM_RPN_PARITY_ODD;
 817                 } else {
 818                         BT_DBG("Parity is EVEN");
 819                         parity = RFCOMM_RPN_PARITY_EVEN;
 820                 }
 821         } else {
 822                 BT_DBG("Parity is OFF");
 823                 parity = RFCOMM_RPN_PARITY_NONE;
 824         }
 825
 826         /* Setting the x_on / x_off characters */
 827         if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
 828                 BT_DBG("XOFF custom");
 829                 x_on = new->c_cc[VSTOP];
 830                 changes |= RFCOMM_RPN_PM_XON;
 831         } else {
 832                 BT_DBG("XOFF default");
 833                 x_on = RFCOMM_RPN_XON_CHAR;
 834         }
 835
 836         if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
 837                 BT_DBG("XON custom");
 838                 x_off = new->c_cc[VSTART];
 839                 changes |= RFCOMM_RPN_PM_XOFF;
 840         } else {
 841                 BT_DBG("XON default");
 842                 x_off = RFCOMM_RPN_XOFF_CHAR;
 843         }
 844
 845         /* Handle setting of stop bits */
 846         if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
 847                 changes |= RFCOMM_RPN_PM_STOP;
 848
 849         /* POSIX does not support 1.5 stop bits and RFCOMM does not
 850          * support 2 stop bits. So a request for 2 stop bits gets
 851          * translated to 1.5 stop bits */
 852         if (new->c_cflag & CSTOPB) {
 853                 stop_bits = RFCOMM_RPN_STOP_15;
 854         } else {
 855                 stop_bits = RFCOMM_RPN_STOP_1;
 856         }
 857
 858         /* Handle number of data bits [5-8] */
 859         if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
 860                 changes |= RFCOMM_RPN_PM_DATA;
 861
 862         switch (new->c_cflag & CSIZE) {
 863         case CS5:
 864                 data_bits = RFCOMM_RPN_DATA_5;
 865                 break;
 866         case CS6:
 867                 data_bits = RFCOMM_RPN_DATA_6;
 868                 break;
 869         case CS7:
 870                 data_bits = RFCOMM_RPN_DATA_7;
 871                 break;
 872         case CS8:
 873                 data_bits = RFCOMM_RPN_DATA_8;
 874                 break;
 875         default:
 876                 data_bits = RFCOMM_RPN_DATA_8;
 877                 break;
 878         }
 879
 880         /* Handle baudrate settings */
 881         if (old_baud_rate != new_baud_rate)
 882                 changes |= RFCOMM_RPN_PM_BITRATE;
 883
 884         switch (new_baud_rate) {
 885         case 2400:
 886                 baud = RFCOMM_RPN_BR_2400;
 887                 break;
 888         case 4800:
 889                 baud = RFCOMM_RPN_BR_4800;
 890                 break;
 891         case 7200:
 892                 baud = RFCOMM_RPN_BR_7200;
 893                 break;
 894         case 9600:
 895                 baud = RFCOMM_RPN_BR_9600;
 896                 break;
 897         case 19200:
 898                 baud = RFCOMM_RPN_BR_19200;
 899                 break;
 900         case 38400:
 901                 baud = RFCOMM_RPN_BR_38400;
 902                 break;
 903         case 57600:
 904                 baud = RFCOMM_RPN_BR_57600;
 905                 break;
 906         case 115200:
 907                 baud = RFCOMM_RPN_BR_115200;
 908                 break;
 909         case 230400:
 910                 baud = RFCOMM_RPN_BR_230400;
 911                 break;
 912         default:
 913                 /* 9600 is standard accordinag to the RFCOMM specification */
 914                 baud = RFCOMM_RPN_BR_9600;
 915                 break;
 916
 917         }
 918
 919         if (changes)
 920                 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
 921                                 data_bits, stop_bits, parity,
 922                                 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
 923
 924         return;
 925 }
 926
 927 static void rfcomm_tty_throttle(struct tty_struct *tty)
 928 {
 929         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 930
 931         BT_DBG("tty %p dev %p", tty, dev);
 932
 933         rfcomm_dlc_throttle(dev->dlc);
 934 }
 935
 936 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
 937 {
 938         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 939
 940         BT_DBG("tty %p dev %p", tty, dev);
 941
 942         rfcomm_dlc_unthrottle(dev->dlc);
 943 }
 944
 945 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 946 {
 947         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 948
 949         BT_DBG("tty %p dev %p", tty, dev);
 950
 951         if (!dev || !dev->dlc)
 952                 return 0;
 953
 954         if (!skb_queue_empty(&dev->dlc->tx_queue))
 955                 return dev->dlc->mtu;
 956
 957         return 0;
 958 }
 959
 960 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
 961 {
 962         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 963
 964         BT_DBG("tty %p dev %p", tty, dev);
 965
 966         if (!dev || !dev->dlc)
 967                 return;
 968
 969         skb_queue_purge(&dev->dlc->tx_queue);
 970
 971         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 972                 tty->ldisc.write_wakeup(tty);
 973 }
 974
 975 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
 976 {
 977         BT_DBG("tty %p ch %c", tty, ch);
 978 }
 979
 980 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 981 {
 982         BT_DBG("tty %p timeout %d", tty, timeout);
 983 }
 984
 985 static void rfcomm_tty_hangup(struct tty_struct *tty)
 986 {
 987         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 988
 989         BT_DBG("tty %p dev %p", tty, dev);
 990
 991         if (!dev)
 992                 return;
 993
 994         rfcomm_tty_flush_buffer(tty);
 995
 996         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 997                 if (rfcomm_dev_get(dev->id) == NULL)
 998                         return;
 999                 rfcomm_dev_del(dev);
1000                 rfcomm_dev_put(dev);
1001         }
1002 }
1003
1004 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
1005 {
1006         return 0;
1007 }
1008
1009 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
1010 {
1011         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1012
1013         BT_DBG("tty %p dev %p", tty, dev);
1014
1015         return dev->modem_status;
1016 }
1017
1018 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
1019 {
1020         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
1021         struct rfcomm_dlc *dlc = dev->dlc;
1022         u8 v24_sig;
1023
1024         BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1025
1026         rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1027
1028         if (set & TIOCM_DSR || set & TIOCM_DTR)
1029                 v24_sig |= RFCOMM_V24_RTC;
1030         if (set & TIOCM_RTS || set & TIOCM_CTS)
1031                 v24_sig |= RFCOMM_V24_RTR;
1032         if (set & TIOCM_RI)
1033                 v24_sig |= RFCOMM_V24_IC;
1034         if (set & TIOCM_CD)
1035                 v24_sig |= RFCOMM_V24_DV;
1036
1037         if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1038                 v24_sig &= ~RFCOMM_V24_RTC;
1039         if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1040                 v24_sig &= ~RFCOMM_V24_RTR;
1041         if (clear & TIOCM_RI)
1042                 v24_sig &= ~RFCOMM_V24_IC;
1043         if (clear & TIOCM_CD)
1044                 v24_sig &= ~RFCOMM_V24_DV;
1045
1046         rfcomm_dlc_set_modem_status(dlc, v24_sig);
1047
1048         return 0;
1049 }
1050
1051 /* ---- TTY structure ---- */
1052
1053 static const struct tty_operations rfcomm_ops = {
1054         .open                   = rfcomm_tty_open,
1055         .close                  = rfcomm_tty_close,
1056         .write                  = rfcomm_tty_write,
1057         .write_room             = rfcomm_tty_write_room,
1058         .chars_in_buffer        = rfcomm_tty_chars_in_buffer,
1059         .flush_buffer           = rfcomm_tty_flush_buffer,
1060         .ioctl                  = rfcomm_tty_ioctl,
1061         .throttle               = rfcomm_tty_throttle,
1062         .unthrottle             = rfcomm_tty_unthrottle,
1063         .set_termios            = rfcomm_tty_set_termios,
1064         .send_xchar             = rfcomm_tty_send_xchar,
1065         .hangup                 = rfcomm_tty_hangup,
1066         .wait_until_sent        = rfcomm_tty_wait_until_sent,
1067         .read_proc              = rfcomm_tty_read_proc,
1068         .tiocmget               = rfcomm_tty_tiocmget,
1069         .tiocmset               = rfcomm_tty_tiocmset,
1070 };
1071
1072 int rfcomm_init_ttys(void)
1073 {
1074         rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1075         if (!rfcomm_tty_driver)
1076                 return -1;
1077
1078         rfcomm_tty_driver->owner        = THIS_MODULE;
1079         rfcomm_tty_driver->driver_name  = "rfcomm";
1080         rfcomm_tty_driver->name         = "rfcomm";
1081         rfcomm_tty_driver->major        = RFCOMM_TTY_MAJOR;
1082         rfcomm_tty_driver->minor_start  = RFCOMM_TTY_MINOR;
1083         rfcomm_tty_driver->type         = TTY_DRIVER_TYPE_SERIAL;
1084         rfcomm_tty_driver->subtype      = SERIAL_TYPE_NORMAL;
1085         rfcomm_tty_driver->flags        = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1086         rfcomm_tty_driver->init_termios = tty_std_termios;
1087         rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1088         tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1089
1090         if (tty_register_driver(rfcomm_tty_driver)) {
1091                 BT_ERR("Can't register RFCOMM TTY driver");
1092                 put_tty_driver(rfcomm_tty_driver);
1093                 return -1;
1094         }
1095
1096         BT_INFO("RFCOMM TTY layer initialized");
1097
1098         return 0;
1099 }
1100
1101 void rfcomm_cleanup_ttys(void)
1102 {
1103         tty_unregister_driver(rfcomm_tty_driver);
1104         put_tty_driver(rfcomm_tty_driver);
1105 }