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/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         tty_insert_flip_string(tty, skb->data, skb->len);
 483         tty_flip_buffer_push(tty);
 484
 485         kfree_skb(skb);
 486 }
 487
 488 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 489 {
 490         struct rfcomm_dev *dev = dlc->owner;
 491         if (!dev)
 492                 return;
 493
 494         BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
 495
 496         dev->err = err;
 497         wake_up_interruptible(&dev->wait);
 498
 499         if (dlc->state == BT_CLOSED) {
 500                 if (!dev->tty) {
 501                         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 502                                 rfcomm_dev_hold(dev);
 503                                 rfcomm_dev_del(dev);
 504
 505                                 /* We have to drop DLC lock here, otherwise
 506                                    rfcomm_dev_put() will dead lock if it's
 507                                    the last reference. */
 508                                 rfcomm_dlc_unlock(dlc);
 509                                 rfcomm_dev_put(dev);
 510                                 rfcomm_dlc_lock(dlc);
 511                         }
 512                 } else
 513                         tty_hangup(dev->tty);
 514         }
 515 }
 516
 517 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
 518 {
 519         struct rfcomm_dev *dev = dlc->owner;
 520         if (!dev)
 521                 return;
 522
 523         BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 524
 525         if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
 526                 if (dev->tty && !C_CLOCAL(dev->tty))
 527                         tty_hangup(dev->tty);
 528         }
 529
 530         dev->modem_status =
 531                 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
 532                 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
 533                 ((v24_sig & RFCOMM_V24_IC)  ? TIOCM_RI : 0) |
 534                 ((v24_sig & RFCOMM_V24_DV)  ? TIOCM_CD : 0);
 535 }
 536
 537 /* ---- TTY functions ---- */
 538 static void rfcomm_tty_wakeup(unsigned long arg)
 539 {
 540         struct rfcomm_dev *dev = (void *) arg;
 541         struct tty_struct *tty = dev->tty;
 542         if (!tty)
 543                 return;
 544
 545         BT_DBG("dev %p tty %p", dev, tty);
 546
 547         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 548                 (tty->ldisc.write_wakeup)(tty);
 549
 550         wake_up_interruptible(&tty->write_wait);
 551 #ifdef SERIAL_HAVE_POLL_WAIT
 552         wake_up_interruptible(&tty->poll_wait);
 553 #endif
 554 }
 555
 556 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 557 {
 558         DECLARE_WAITQUEUE(wait, current);
 559         struct rfcomm_dev *dev;
 560         struct rfcomm_dlc *dlc;
 561         int err, id;
 562
 563         id = tty->index;
 564
 565         BT_DBG("tty %p id %d", tty, id);
 566
 567         /* We don't leak this refcount. For reasons which are not entirely
 568            clear, the TTY layer will call our ->close() method even if the
 569            open fails. We decrease the refcount there, and decreasing it
 570            here too would cause breakage. */
 571         dev = rfcomm_dev_get(id);
 572         if (!dev)
 573                 return -ENODEV;
 574
 575         BT_DBG("dev %p dst %s channel %d opened %d", dev, batostr(&dev->dst), dev->channel, dev->opened);
 576
 577         if (dev->opened++ != 0)
 578                 return 0;
 579
 580         dlc = dev->dlc;
 581
 582         /* Attach TTY and open DLC */
 583
 584         rfcomm_dlc_lock(dlc);
 585         tty->driver_data = dev;
 586         dev->tty = tty;
 587         rfcomm_dlc_unlock(dlc);
 588         set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 589
 590         err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
 591         if (err < 0)
 592                 return err;
 593
 594         /* Wait for DLC to connect */
 595         add_wait_queue(&dev->wait, &wait);
 596         while (1) {
 597                 set_current_state(TASK_INTERRUPTIBLE);
 598
 599                 if (dlc->state == BT_CLOSED) {
 600                         err = -dev->err;
 601                         break;
 602                 }
 603
 604                 if (dlc->state == BT_CONNECTED)
 605                         break;
 606
 607                 if (signal_pending(current)) {
 608                         err = -EINTR;
 609                         break;
 610                 }
 611
 612                 schedule();
 613         }
 614         set_current_state(TASK_RUNNING);
 615         remove_wait_queue(&dev->wait, &wait);
 616
 617         return err;
 618 }
 619
 620 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
 621 {
 622         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 623         if (!dev)
 624                 return;
 625
 626         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, dev->opened);
 627
 628         if (--dev->opened == 0) {
 629                 /* Close DLC and dettach TTY */
 630                 rfcomm_dlc_close(dev->dlc, 0);
 631
 632                 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 633                 tasklet_kill(&dev->wakeup_task);
 634
 635                 rfcomm_dlc_lock(dev->dlc);
 636                 tty->driver_data = NULL;
 637                 dev->tty = NULL;
 638                 rfcomm_dlc_unlock(dev->dlc);
 639         }
 640
 641         rfcomm_dev_put(dev);
 642 }
 643
 644 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
 645 {
 646         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 647         struct rfcomm_dlc *dlc = dev->dlc;
 648         struct sk_buff *skb;
 649         int err = 0, sent = 0, size;
 650
 651         BT_DBG("tty %p count %d", tty, count);
 652
 653         while (count) {
 654                 size = min_t(uint, count, dlc->mtu);
 655
 656                 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
 657
 658                 if (!skb)
 659                         break;
 660
 661                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 662
 663                 memcpy(skb_put(skb, size), buf + sent, size);
 664
 665                 if ((err = rfcomm_dlc_send(dlc, skb)) < 0) {
 666                         kfree_skb(skb);
 667                         break;
 668                 }
 669
 670                 sent  += size;
 671                 count -= size;
 672         }
 673
 674         return sent ? sent : err;
 675 }
 676
 677 static int rfcomm_tty_write_room(struct tty_struct *tty)
 678 {
 679         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 680         int room;
 681
 682         BT_DBG("tty %p", tty);
 683
 684         room = rfcomm_room(dev->dlc) - atomic_read(&dev->wmem_alloc);
 685         if (room < 0)
 686                 room = 0;
 687         return room;
 688 }
 689
 690 static int rfcomm_tty_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, unsigned long arg)
 691 {
 692         BT_DBG("tty %p cmd 0x%02x", tty, cmd);
 693
 694         switch (cmd) {
 695         case TCGETS:
 696                 BT_DBG("TCGETS is not supported");
 697                 return -ENOIOCTLCMD;
 698
 699         case TCSETS:
 700                 BT_DBG("TCSETS is not supported");
 701                 return -ENOIOCTLCMD;
 702
 703         case TIOCMIWAIT:
 704                 BT_DBG("TIOCMIWAIT");
 705                 break;
 706
 707         case TIOCGICOUNT:
 708                 BT_DBG("TIOCGICOUNT");
 709                 break;
 710
 711         case TIOCGSERIAL:
 712                 BT_ERR("TIOCGSERIAL is not supported");
 713                 return -ENOIOCTLCMD;
 714
 715         case TIOCSSERIAL:
 716                 BT_ERR("TIOCSSERIAL is not supported");
 717                 return -ENOIOCTLCMD;
 718
 719         case TIOCSERGSTRUCT:
 720                 BT_ERR("TIOCSERGSTRUCT is not supported");
 721                 return -ENOIOCTLCMD;
 722
 723         case TIOCSERGETLSR:
 724                 BT_ERR("TIOCSERGETLSR is not supported");
 725                 return -ENOIOCTLCMD;
 726
 727         case TIOCSERCONFIG:
 728                 BT_ERR("TIOCSERCONFIG is not supported");
 729                 return -ENOIOCTLCMD;
 730
 731         default:
 732                 return -ENOIOCTLCMD;    /* ioctls which we must ignore */
 733
 734         }
 735
 736         return -ENOIOCTLCMD;
 737 }
 738
 739 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct termios *old)
 740 {
 741         struct termios *new = (struct termios *) tty->termios;
 742         int old_baud_rate = tty_termios_baud_rate(old);
 743         int new_baud_rate = tty_termios_baud_rate(new);
 744
 745         u8 baud, data_bits, stop_bits, parity, x_on, x_off;
 746         u16 changes = 0;
 747
 748         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 749
 750         BT_DBG("tty %p termios %p", tty, old);
 751
 752         /* Handle turning off CRTSCTS */
 753         if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
 754                 BT_DBG("Turning off CRTSCTS unsupported");
 755
 756         /* Parity on/off and when on, odd/even */
 757         if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
 758                         ((old->c_cflag & PARODD) != (new->c_cflag & PARODD)) ) {
 759                 changes |= RFCOMM_RPN_PM_PARITY;
 760                 BT_DBG("Parity change detected.");
 761         }
 762
 763         /* Mark and space parity are not supported! */
 764         if (new->c_cflag & PARENB) {
 765                 if (new->c_cflag & PARODD) {
 766                         BT_DBG("Parity is ODD");
 767                         parity = RFCOMM_RPN_PARITY_ODD;
 768                 } else {
 769                         BT_DBG("Parity is EVEN");
 770                         parity = RFCOMM_RPN_PARITY_EVEN;
 771                 }
 772         } else {
 773                 BT_DBG("Parity is OFF");
 774                 parity = RFCOMM_RPN_PARITY_NONE;
 775         }
 776
 777         /* Setting the x_on / x_off characters */
 778         if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
 779                 BT_DBG("XOFF custom");
 780                 x_on = new->c_cc[VSTOP];
 781                 changes |= RFCOMM_RPN_PM_XON;
 782         } else {
 783                 BT_DBG("XOFF default");
 784                 x_on = RFCOMM_RPN_XON_CHAR;
 785         }
 786
 787         if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
 788                 BT_DBG("XON custom");
 789                 x_off = new->c_cc[VSTART];
 790                 changes |= RFCOMM_RPN_PM_XOFF;
 791         } else {
 792                 BT_DBG("XON default");
 793                 x_off = RFCOMM_RPN_XOFF_CHAR;
 794         }
 795
 796         /* Handle setting of stop bits */
 797         if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
 798                 changes |= RFCOMM_RPN_PM_STOP;
 799
 800         /* POSIX does not support 1.5 stop bits and RFCOMM does not
 801          * support 2 stop bits. So a request for 2 stop bits gets
 802          * translated to 1.5 stop bits */
 803         if (new->c_cflag & CSTOPB) {
 804                 stop_bits = RFCOMM_RPN_STOP_15;
 805         } else {
 806                 stop_bits = RFCOMM_RPN_STOP_1;
 807         }
 808
 809         /* Handle number of data bits [5-8] */
 810         if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
 811                 changes |= RFCOMM_RPN_PM_DATA;
 812
 813         switch (new->c_cflag & CSIZE) {
 814         case CS5:
 815                 data_bits = RFCOMM_RPN_DATA_5;
 816                 break;
 817         case CS6:
 818                 data_bits = RFCOMM_RPN_DATA_6;
 819                 break;
 820         case CS7:
 821                 data_bits = RFCOMM_RPN_DATA_7;
 822                 break;
 823         case CS8:
 824                 data_bits = RFCOMM_RPN_DATA_8;
 825                 break;
 826         default:
 827                 data_bits = RFCOMM_RPN_DATA_8;
 828                 break;
 829         }
 830
 831         /* Handle baudrate settings */
 832         if (old_baud_rate != new_baud_rate)
 833                 changes |= RFCOMM_RPN_PM_BITRATE;
 834
 835         switch (new_baud_rate) {
 836         case 2400:
 837                 baud = RFCOMM_RPN_BR_2400;
 838                 break;
 839         case 4800:
 840                 baud = RFCOMM_RPN_BR_4800;
 841                 break;
 842         case 7200:
 843                 baud = RFCOMM_RPN_BR_7200;
 844                 break;
 845         case 9600:
 846                 baud = RFCOMM_RPN_BR_9600;
 847                 break;
 848         case 19200:
 849                 baud = RFCOMM_RPN_BR_19200;
 850                 break;
 851         case 38400:
 852                 baud = RFCOMM_RPN_BR_38400;
 853                 break;
 854         case 57600:
 855                 baud = RFCOMM_RPN_BR_57600;
 856                 break;
 857         case 115200:
 858                 baud = RFCOMM_RPN_BR_115200;
 859                 break;
 860         case 230400:
 861                 baud = RFCOMM_RPN_BR_230400;
 862                 break;
 863         default:
 864                 /* 9600 is standard accordinag to the RFCOMM specification */
 865                 baud = RFCOMM_RPN_BR_9600;
 866                 break;
 867
 868         }
 869
 870         if (changes)
 871                 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
 872                                 data_bits, stop_bits, parity,
 873                                 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
 874
 875         return;
 876 }
 877
 878 static void rfcomm_tty_throttle(struct tty_struct *tty)
 879 {
 880         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 881
 882         BT_DBG("tty %p dev %p", tty, dev);
 883
 884         rfcomm_dlc_throttle(dev->dlc);
 885 }
 886
 887 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
 888 {
 889         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 890
 891         BT_DBG("tty %p dev %p", tty, dev);
 892
 893         rfcomm_dlc_unthrottle(dev->dlc);
 894 }
 895
 896 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
 897 {
 898         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 899         struct rfcomm_dlc *dlc = dev->dlc;
 900
 901         BT_DBG("tty %p dev %p", tty, dev);
 902
 903         if (!skb_queue_empty(&dlc->tx_queue))
 904                 return dlc->mtu;
 905
 906         return 0;
 907 }
 908
 909 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
 910 {
 911         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 912         if (!dev)
 913                 return;
 914
 915         BT_DBG("tty %p dev %p", tty, dev);
 916
 917         skb_queue_purge(&dev->dlc->tx_queue);
 918
 919         if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) && tty->ldisc.write_wakeup)
 920                 tty->ldisc.write_wakeup(tty);
 921 }
 922
 923 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
 924 {
 925         BT_DBG("tty %p ch %c", tty, ch);
 926 }
 927
 928 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
 929 {
 930         BT_DBG("tty %p timeout %d", tty, timeout);
 931 }
 932
 933 static void rfcomm_tty_hangup(struct tty_struct *tty)
 934 {
 935         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 936         if (!dev)
 937                 return;
 938
 939         BT_DBG("tty %p dev %p", tty, dev);
 940
 941         rfcomm_tty_flush_buffer(tty);
 942
 943         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags))
 944                 rfcomm_dev_del(dev);
 945 }
 946
 947 static int rfcomm_tty_read_proc(char *buf, char **start, off_t offset, int len, int *eof, void *unused)
 948 {
 949         return 0;
 950 }
 951
 952 static int rfcomm_tty_tiocmget(struct tty_struct *tty, struct file *filp)
 953 {
 954         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 955
 956         BT_DBG("tty %p dev %p", tty, dev);
 957
 958         return dev->modem_status;
 959 }
 960
 961 static int rfcomm_tty_tiocmset(struct tty_struct *tty, struct file *filp, unsigned int set, unsigned int clear)
 962 {
 963         struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
 964         struct rfcomm_dlc *dlc = dev->dlc;
 965         u8 v24_sig;
 966
 967         BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
 968
 969         rfcomm_dlc_get_modem_status(dlc, &v24_sig);
 970
 971         if (set & TIOCM_DSR || set & TIOCM_DTR)
 972                 v24_sig |= RFCOMM_V24_RTC;
 973         if (set & TIOCM_RTS || set & TIOCM_CTS)
 974                 v24_sig |= RFCOMM_V24_RTR;
 975         if (set & TIOCM_RI)
 976                 v24_sig |= RFCOMM_V24_IC;
 977         if (set & TIOCM_CD)
 978                 v24_sig |= RFCOMM_V24_DV;
 979
 980         if (clear & TIOCM_DSR || clear & TIOCM_DTR)
 981                 v24_sig &= ~RFCOMM_V24_RTC;
 982         if (clear & TIOCM_RTS || clear & TIOCM_CTS)
 983                 v24_sig &= ~RFCOMM_V24_RTR;
 984         if (clear & TIOCM_RI)
 985                 v24_sig &= ~RFCOMM_V24_IC;
 986         if (clear & TIOCM_CD)
 987                 v24_sig &= ~RFCOMM_V24_DV;
 988
 989         rfcomm_dlc_set_modem_status(dlc, v24_sig);
 990
 991         return 0;
 992 }
 993
 994 /* ---- TTY structure ---- */
 995
 996 static struct tty_operations rfcomm_ops = {
 997         .open                   = rfcomm_tty_open,
 998         .close                  = rfcomm_tty_close,
 999         .write                  = rfcomm_tty_write,
1000         .write_room             = rfcomm_tty_write_room,
1001         .chars_in_buffer        = rfcomm_tty_chars_in_buffer,
1002         .flush_buffer           = rfcomm_tty_flush_buffer,
1003         .ioctl                  = rfcomm_tty_ioctl,
1004         .throttle               = rfcomm_tty_throttle,
1005         .unthrottle             = rfcomm_tty_unthrottle,
1006         .set_termios            = rfcomm_tty_set_termios,
1007         .send_xchar             = rfcomm_tty_send_xchar,
1008         .hangup                 = rfcomm_tty_hangup,
1009         .wait_until_sent        = rfcomm_tty_wait_until_sent,
1010         .read_proc              = rfcomm_tty_read_proc,
1011         .tiocmget               = rfcomm_tty_tiocmget,
1012         .tiocmset               = rfcomm_tty_tiocmset,
1013 };
1014
1015 int rfcomm_init_ttys(void)
1016 {
1017         rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
1018         if (!rfcomm_tty_driver)
1019                 return -1;
1020
1021         rfcomm_tty_driver->owner        = THIS_MODULE;
1022         rfcomm_tty_driver->driver_name  = "rfcomm";
1023         rfcomm_tty_driver->name         = "rfcomm";
1024         rfcomm_tty_driver->major        = RFCOMM_TTY_MAJOR;
1025         rfcomm_tty_driver->minor_start  = RFCOMM_TTY_MINOR;
1026         rfcomm_tty_driver->type         = TTY_DRIVER_TYPE_SERIAL;
1027         rfcomm_tty_driver->subtype      = SERIAL_TYPE_NORMAL;
1028         rfcomm_tty_driver->flags        = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1029         rfcomm_tty_driver->init_termios = tty_std_termios;
1030         rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1031         tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1032
1033         if (tty_register_driver(rfcomm_tty_driver)) {
1034                 BT_ERR("Can't register RFCOMM TTY driver");
1035                 put_tty_driver(rfcomm_tty_driver);
1036                 return -1;
1037         }
1038
1039         BT_INFO("RFCOMM TTY layer initialized");
1040
1041         return 0;
1042 }
1043
1044 void rfcomm_cleanup_ttys(void)
1045 {
1046         tty_unregister_driver(rfcomm_tty_driver);
1047         put_tty_driver(rfcomm_tty_driver);
1048 }