net/bluetooth/hci_core.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4
   5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License version 2 as
   9    published by the Free Software Foundation;
  10
  11    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  12    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  13    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  14    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  15    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  16    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19
  20    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  21    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  22    SOFTWARE IS DISCLAIMED.
  23 */
  24
  25 /* Bluetooth HCI core. */
  26
  27 #include <linux/module.h>
  28 #include <linux/kmod.h>
  29
  30 #include <linux/types.h>
  31 #include <linux/errno.h>
  32 #include <linux/kernel.h>
  33 #include <linux/sched.h>
  34 #include <linux/slab.h>
  35 #include <linux/poll.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/init.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/notifier.h>
  41 #include <net/sock.h>
  42
  43 #include <asm/system.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/unaligned.h>
  46
  47 #include <net/bluetooth/bluetooth.h>
  48 #include <net/bluetooth/hci_core.h>
  49
  50 #ifndef CONFIG_BT_HCI_CORE_DEBUG
  51 #undef  BT_DBG
  52 #define BT_DBG(D...)
  53 #endif
  54
  55 static void hci_cmd_task(unsigned long arg);
  56 static void hci_rx_task(unsigned long arg);
  57 static void hci_tx_task(unsigned long arg);
  58 static void hci_notify(struct hci_dev *hdev, int event);
  59
  60 static DEFINE_RWLOCK(hci_task_lock);
  61
  62 /* HCI device list */
  63 LIST_HEAD(hci_dev_list);
  64 DEFINE_RWLOCK(hci_dev_list_lock);
  65
  66 /* HCI callback list */
  67 LIST_HEAD(hci_cb_list);
  68 DEFINE_RWLOCK(hci_cb_list_lock);
  69
  70 /* HCI protocols */
  71 #define HCI_MAX_PROTO   2
  72 struct hci_proto *hci_proto[HCI_MAX_PROTO];
  73
  74 /* HCI notifiers list */
  75 static ATOMIC_NOTIFIER_HEAD(hci_notifier);
  76
  77 /* ---- HCI notifications ---- */
  78
  79 int hci_register_notifier(struct notifier_block *nb)
  80 {
  81         return atomic_notifier_chain_register(&hci_notifier, nb);
  82 }
  83
  84 int hci_unregister_notifier(struct notifier_block *nb)
  85 {
  86         return atomic_notifier_chain_unregister(&hci_notifier, nb);
  87 }
  88
  89 static void hci_notify(struct hci_dev *hdev, int event)
  90 {
  91         atomic_notifier_call_chain(&hci_notifier, event, hdev);
  92 }
  93
  94 /* ---- HCI requests ---- */
  95
  96 void hci_req_complete(struct hci_dev *hdev, int result)
  97 {
  98         BT_DBG("%s result 0x%2.2x", hdev->name, result);
  99
 100         if (hdev->req_status == HCI_REQ_PEND) {
 101                 hdev->req_result = result;
 102                 hdev->req_status = HCI_REQ_DONE;
 103                 wake_up_interruptible(&hdev->req_wait_q);
 104         }
 105 }
 106
 107 static void hci_req_cancel(struct hci_dev *hdev, int err)
 108 {
 109         BT_DBG("%s err 0x%2.2x", hdev->name, err);
 110
 111         if (hdev->req_status == HCI_REQ_PEND) {
 112                 hdev->req_result = err;
 113                 hdev->req_status = HCI_REQ_CANCELED;
 114                 wake_up_interruptible(&hdev->req_wait_q);
 115         }
 116 }
 117
 118 /* Execute request and wait for completion. */
 119 static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
 120                                 unsigned long opt, __u32 timeout)
 121 {
 122         DECLARE_WAITQUEUE(wait, current);
 123         int err = 0;
 124
 125         BT_DBG("%s start", hdev->name);
 126
 127         hdev->req_status = HCI_REQ_PEND;
 128
 129         add_wait_queue(&hdev->req_wait_q, &wait);
 130         set_current_state(TASK_INTERRUPTIBLE);
 131
 132         req(hdev, opt);
 133         schedule_timeout(timeout);
 134
 135         remove_wait_queue(&hdev->req_wait_q, &wait);
 136
 137         if (signal_pending(current))
 138                 return -EINTR;
 139
 140         switch (hdev->req_status) {
 141         case HCI_REQ_DONE:
 142                 err = -bt_err(hdev->req_result);
 143                 break;
 144
 145         case HCI_REQ_CANCELED:
 146                 err = -hdev->req_result;
 147                 break;
 148
 149         default:
 150                 err = -ETIMEDOUT;
 151                 break;
 152         };
 153
 154         hdev->req_status = hdev->req_result = 0;
 155
 156         BT_DBG("%s end: err %d", hdev->name, err);
 157
 158         return err;
 159 }
 160
 161 static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
 162                                 unsigned long opt, __u32 timeout)
 163 {
 164         int ret;
 165
 166         /* Serialize all requests */
 167         hci_req_lock(hdev);
 168         ret = __hci_request(hdev, req, opt, timeout);
 169         hci_req_unlock(hdev);
 170
 171         return ret;
 172 }
 173
 174 static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
 175 {
 176         BT_DBG("%s %ld", hdev->name, opt);
 177
 178         /* Reset device */
 179         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_RESET, 0, NULL);
 180 }
 181
 182 static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
 183 {
 184         struct sk_buff *skb;
 185         __le16 param;
 186
 187         BT_DBG("%s %ld", hdev->name, opt);
 188
 189         /* Driver initialization */
 190
 191         /* Special commands */
 192         while ((skb = skb_dequeue(&hdev->driver_init))) {
 193                 bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 194                 skb->dev = (void *) hdev;
 195                 skb_queue_tail(&hdev->cmd_q, skb);
 196                 hci_sched_cmd(hdev);
 197         }
 198         skb_queue_purge(&hdev->driver_init);
 199
 200         /* Mandatory initialization */
 201
 202         /* Reset */
 203         if (test_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks))
 204                         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_RESET, 0, NULL);
 205
 206         /* Read Local Supported Features */
 207         hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_LOCAL_FEATURES, 0, NULL);
 208
 209         /* Read Local Version */
 210         hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_LOCAL_VERSION, 0, NULL);
 211
 212         /* Read Buffer Size (ACL mtu, max pkt, etc.) */
 213         hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BUFFER_SIZE, 0, NULL);
 214
 215 #if 0
 216         /* Host buffer size */
 217         {
 218                 struct hci_cp_host_buffer_size cp;
 219                 cp.acl_mtu = __cpu_to_le16(HCI_MAX_ACL_SIZE);
 220                 cp.sco_mtu = HCI_MAX_SCO_SIZE;
 221                 cp.acl_max_pkt = __cpu_to_le16(0xffff);
 222                 cp.sco_max_pkt = __cpu_to_le16(0xffff);
 223                 hci_send_cmd(hdev, OGF_HOST_CTL, OCF_HOST_BUFFER_SIZE, sizeof(cp), &cp);
 224         }
 225 #endif
 226
 227         /* Read BD Address */
 228         hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BD_ADDR, 0, NULL);
 229
 230         /* Read Voice Setting */
 231         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_READ_VOICE_SETTING, 0, NULL);
 232
 233         /* Optional initialization */
 234
 235         /* Clear Event Filters */
 236         {
 237                 struct hci_cp_set_event_flt cp;
 238                 cp.flt_type  = HCI_FLT_CLEAR_ALL;
 239                 hci_send_cmd(hdev, OGF_HOST_CTL, OCF_SET_EVENT_FLT, sizeof(cp), &cp);
 240         }
 241
 242         /* Page timeout ~20 secs */
 243         param = __cpu_to_le16(0x8000);
 244         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_PG_TIMEOUT, 2, &param);
 245
 246         /* Connection accept timeout ~20 secs */
 247         param = __cpu_to_le16(0x7d00);
 248         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_CA_TIMEOUT, 2, &param);
 249 }
 250
 251 static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
 252 {
 253         __u8 scan = opt;
 254
 255         BT_DBG("%s %x", hdev->name, scan);
 256
 257         /* Inquiry and Page scans */
 258         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE, 1, &scan);
 259 }
 260
 261 static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
 262 {
 263         __u8 auth = opt;
 264
 265         BT_DBG("%s %x", hdev->name, auth);
 266
 267         /* Authentication */
 268         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_AUTH_ENABLE, 1, &auth);
 269 }
 270
 271 static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
 272 {
 273         __u8 encrypt = opt;
 274
 275         BT_DBG("%s %x", hdev->name, encrypt);
 276
 277         /* Authentication */
 278         hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_ENCRYPT_MODE, 1, &encrypt);
 279 }
 280
 281 /* Get HCI device by index.
 282  * Device is held on return. */
 283 struct hci_dev *hci_dev_get(int index)
 284 {
 285         struct hci_dev *hdev = NULL;
 286         struct list_head *p;
 287
 288         BT_DBG("%d", index);
 289
 290         if (index < 0)
 291                 return NULL;
 292
 293         read_lock(&hci_dev_list_lock);
 294         list_for_each(p, &hci_dev_list) {
 295                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 296                 if (d->id == index) {
 297                         hdev = hci_dev_hold(d);
 298                         break;
 299                 }
 300         }
 301         read_unlock(&hci_dev_list_lock);
 302         return hdev;
 303 }
 304
 305 /* ---- Inquiry support ---- */
 306 static void inquiry_cache_flush(struct hci_dev *hdev)
 307 {
 308         struct inquiry_cache *cache = &hdev->inq_cache;
 309         struct inquiry_entry *next  = cache->list, *e;
 310
 311         BT_DBG("cache %p", cache);
 312
 313         cache->list = NULL;
 314         while ((e = next)) {
 315                 next = e->next;
 316                 kfree(e);
 317         }
 318 }
 319
 320 struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
 321 {
 322         struct inquiry_cache *cache = &hdev->inq_cache;
 323         struct inquiry_entry *e;
 324
 325         BT_DBG("cache %p, %s", cache, batostr(bdaddr));
 326
 327         for (e = cache->list; e; e = e->next)
 328                 if (!bacmp(&e->data.bdaddr, bdaddr))
 329                         break;
 330         return e;
 331 }
 332
 333 void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data)
 334 {
 335         struct inquiry_cache *cache = &hdev->inq_cache;
 336         struct inquiry_entry *e;
 337
 338         BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr));
 339
 340         if (!(e = hci_inquiry_cache_lookup(hdev, &data->bdaddr))) {
 341                 /* Entry not in the cache. Add new one. */
 342                 if (!(e = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC)))
 343                         return;
 344                 e->next     = cache->list;
 345                 cache->list = e;
 346         }
 347
 348         memcpy(&e->data, data, sizeof(*data));
 349         e->timestamp = jiffies;
 350         cache->timestamp = jiffies;
 351 }
 352
 353 static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
 354 {
 355         struct inquiry_cache *cache = &hdev->inq_cache;
 356         struct inquiry_info *info = (struct inquiry_info *) buf;
 357         struct inquiry_entry *e;
 358         int copied = 0;
 359
 360         for (e = cache->list; e && copied < num; e = e->next, copied++) {
 361                 struct inquiry_data *data = &e->data;
 362                 bacpy(&info->bdaddr, &data->bdaddr);
 363                 info->pscan_rep_mode    = data->pscan_rep_mode;
 364                 info->pscan_period_mode = data->pscan_period_mode;
 365                 info->pscan_mode        = data->pscan_mode;
 366                 memcpy(info->dev_class, data->dev_class, 3);
 367                 info->clock_offset      = data->clock_offset;
 368                 info++;
 369         }
 370
 371         BT_DBG("cache %p, copied %d", cache, copied);
 372         return copied;
 373 }
 374
 375 static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
 376 {
 377         struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
 378         struct hci_cp_inquiry cp;
 379
 380         BT_DBG("%s", hdev->name);
 381
 382         if (test_bit(HCI_INQUIRY, &hdev->flags))
 383                 return;
 384
 385         /* Start Inquiry */
 386         memcpy(&cp.lap, &ir->lap, 3);
 387         cp.length  = ir->length;
 388         cp.num_rsp = ir->num_rsp;
 389         hci_send_cmd(hdev, OGF_LINK_CTL, OCF_INQUIRY, sizeof(cp), &cp);
 390 }
 391
 392 int hci_inquiry(void __user *arg)
 393 {
 394         __u8 __user *ptr = arg;
 395         struct hci_inquiry_req ir;
 396         struct hci_dev *hdev;
 397         int err = 0, do_inquiry = 0, max_rsp;
 398         long timeo;
 399         __u8 *buf;
 400
 401         if (copy_from_user(&ir, ptr, sizeof(ir)))
 402                 return -EFAULT;
 403
 404         if (!(hdev = hci_dev_get(ir.dev_id)))
 405                 return -ENODEV;
 406
 407         hci_dev_lock_bh(hdev);
 408         if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
 409                                         inquiry_cache_empty(hdev) ||
 410                                         ir.flags & IREQ_CACHE_FLUSH) {
 411                 inquiry_cache_flush(hdev);
 412                 do_inquiry = 1;
 413         }
 414         hci_dev_unlock_bh(hdev);
 415
 416         timeo = ir.length * msecs_to_jiffies(2000);
 417         if (do_inquiry && (err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo)) < 0)
 418                 goto done;
 419
 420         /* for unlimited number of responses we will use buffer with 255 entries */
 421         max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;
 422
 423         /* cache_dump can't sleep. Therefore we allocate temp buffer and then
 424          * copy it to the user space.
 425          */
 426         if (!(buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL))) {
 427                 err = -ENOMEM;
 428                 goto done;
 429         }
 430
 431         hci_dev_lock_bh(hdev);
 432         ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
 433         hci_dev_unlock_bh(hdev);
 434
 435         BT_DBG("num_rsp %d", ir.num_rsp);
 436
 437         if (!copy_to_user(ptr, &ir, sizeof(ir))) {
 438                 ptr += sizeof(ir);
 439                 if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
 440                                         ir.num_rsp))
 441                         err = -EFAULT;
 442         } else
 443                 err = -EFAULT;
 444
 445         kfree(buf);
 446
 447 done:
 448         hci_dev_put(hdev);
 449         return err;
 450 }
 451
 452 /* ---- HCI ioctl helpers ---- */
 453
 454 int hci_dev_open(__u16 dev)
 455 {
 456         struct hci_dev *hdev;
 457         int ret = 0;
 458
 459         if (!(hdev = hci_dev_get(dev)))
 460                 return -ENODEV;
 461
 462         BT_DBG("%s %p", hdev->name, hdev);
 463
 464         hci_req_lock(hdev);
 465
 466         if (test_bit(HCI_UP, &hdev->flags)) {
 467                 ret = -EALREADY;
 468                 goto done;
 469         }
 470
 471         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 472                 set_bit(HCI_RAW, &hdev->flags);
 473
 474         if (hdev->open(hdev)) {
 475                 ret = -EIO;
 476                 goto done;
 477         }
 478
 479         if (!test_bit(HCI_RAW, &hdev->flags)) {
 480                 atomic_set(&hdev->cmd_cnt, 1);
 481                 set_bit(HCI_INIT, &hdev->flags);
 482
 483                 //__hci_request(hdev, hci_reset_req, 0, HZ);
 484                 ret = __hci_request(hdev, hci_init_req, 0,
 485                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 486
 487                 clear_bit(HCI_INIT, &hdev->flags);
 488         }
 489
 490         if (!ret) {
 491                 hci_dev_hold(hdev);
 492                 set_bit(HCI_UP, &hdev->flags);
 493                 hci_notify(hdev, HCI_DEV_UP);
 494         } else {
 495                 /* Init failed, cleanup */
 496                 tasklet_kill(&hdev->rx_task);
 497                 tasklet_kill(&hdev->tx_task);
 498                 tasklet_kill(&hdev->cmd_task);
 499
 500                 skb_queue_purge(&hdev->cmd_q);
 501                 skb_queue_purge(&hdev->rx_q);
 502
 503                 if (hdev->flush)
 504                         hdev->flush(hdev);
 505
 506                 if (hdev->sent_cmd) {
 507                         kfree_skb(hdev->sent_cmd);
 508                         hdev->sent_cmd = NULL;
 509                 }
 510
 511                 hdev->close(hdev);
 512                 hdev->flags = 0;
 513         }
 514
 515 done:
 516         hci_req_unlock(hdev);
 517         hci_dev_put(hdev);
 518         return ret;
 519 }
 520
 521 static int hci_dev_do_close(struct hci_dev *hdev)
 522 {
 523         BT_DBG("%s %p", hdev->name, hdev);
 524
 525         hci_req_cancel(hdev, ENODEV);
 526         hci_req_lock(hdev);
 527
 528         if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
 529                 hci_req_unlock(hdev);
 530                 return 0;
 531         }
 532
 533         /* Kill RX and TX tasks */
 534         tasklet_kill(&hdev->rx_task);
 535         tasklet_kill(&hdev->tx_task);
 536
 537         hci_dev_lock_bh(hdev);
 538         inquiry_cache_flush(hdev);
 539         hci_conn_hash_flush(hdev);
 540         hci_dev_unlock_bh(hdev);
 541
 542         hci_notify(hdev, HCI_DEV_DOWN);
 543
 544         if (hdev->flush)
 545                 hdev->flush(hdev);
 546
 547         /* Reset device */
 548         skb_queue_purge(&hdev->cmd_q);
 549         atomic_set(&hdev->cmd_cnt, 1);
 550         if (!test_bit(HCI_RAW, &hdev->flags)) {
 551                 set_bit(HCI_INIT, &hdev->flags);
 552                 __hci_request(hdev, hci_reset_req, 0,
 553                                         msecs_to_jiffies(250));
 554                 clear_bit(HCI_INIT, &hdev->flags);
 555         }
 556
 557         /* Kill cmd task */
 558         tasklet_kill(&hdev->cmd_task);
 559
 560         /* Drop queues */
 561         skb_queue_purge(&hdev->rx_q);
 562         skb_queue_purge(&hdev->cmd_q);
 563         skb_queue_purge(&hdev->raw_q);
 564
 565         /* Drop last sent command */
 566         if (hdev->sent_cmd) {
 567                 kfree_skb(hdev->sent_cmd);
 568                 hdev->sent_cmd = NULL;
 569         }
 570
 571         /* After this point our queues are empty
 572          * and no tasks are scheduled. */
 573         hdev->close(hdev);
 574
 575         /* Clear flags */
 576         hdev->flags = 0;
 577
 578         hci_req_unlock(hdev);
 579
 580         hci_dev_put(hdev);
 581         return 0;
 582 }
 583
 584 int hci_dev_close(__u16 dev)
 585 {
 586         struct hci_dev *hdev;
 587         int err;
 588
 589         if (!(hdev = hci_dev_get(dev)))
 590                 return -ENODEV;
 591         err = hci_dev_do_close(hdev);
 592         hci_dev_put(hdev);
 593         return err;
 594 }
 595
 596 int hci_dev_reset(__u16 dev)
 597 {
 598         struct hci_dev *hdev;
 599         int ret = 0;
 600
 601         if (!(hdev = hci_dev_get(dev)))
 602                 return -ENODEV;
 603
 604         hci_req_lock(hdev);
 605         tasklet_disable(&hdev->tx_task);
 606
 607         if (!test_bit(HCI_UP, &hdev->flags))
 608                 goto done;
 609
 610         /* Drop queues */
 611         skb_queue_purge(&hdev->rx_q);
 612         skb_queue_purge(&hdev->cmd_q);
 613
 614         hci_dev_lock_bh(hdev);
 615         inquiry_cache_flush(hdev);
 616         hci_conn_hash_flush(hdev);
 617         hci_dev_unlock_bh(hdev);
 618
 619         if (hdev->flush)
 620                 hdev->flush(hdev);
 621
 622         atomic_set(&hdev->cmd_cnt, 1);
 623         hdev->acl_cnt = 0; hdev->sco_cnt = 0;
 624
 625         if (!test_bit(HCI_RAW, &hdev->flags))
 626                 ret = __hci_request(hdev, hci_reset_req, 0,
 627                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 628
 629 done:
 630         tasklet_enable(&hdev->tx_task);
 631         hci_req_unlock(hdev);
 632         hci_dev_put(hdev);
 633         return ret;
 634 }
 635
 636 int hci_dev_reset_stat(__u16 dev)
 637 {
 638         struct hci_dev *hdev;
 639         int ret = 0;
 640
 641         if (!(hdev = hci_dev_get(dev)))
 642                 return -ENODEV;
 643
 644         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
 645
 646         hci_dev_put(hdev);
 647
 648         return ret;
 649 }
 650
 651 int hci_dev_cmd(unsigned int cmd, void __user *arg)
 652 {
 653         struct hci_dev *hdev;
 654         struct hci_dev_req dr;
 655         int err = 0;
 656
 657         if (copy_from_user(&dr, arg, sizeof(dr)))
 658                 return -EFAULT;
 659
 660         if (!(hdev = hci_dev_get(dr.dev_id)))
 661                 return -ENODEV;
 662
 663         switch (cmd) {
 664         case HCISETAUTH:
 665                 err = hci_request(hdev, hci_auth_req, dr.dev_opt,
 666                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 667                 break;
 668
 669         case HCISETENCRYPT:
 670                 if (!lmp_encrypt_capable(hdev)) {
 671                         err = -EOPNOTSUPP;
 672                         break;
 673                 }
 674
 675                 if (!test_bit(HCI_AUTH, &hdev->flags)) {
 676                         /* Auth must be enabled first */
 677                         err = hci_request(hdev, hci_auth_req, dr.dev_opt,
 678                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 679                         if (err)
 680                                 break;
 681                 }
 682
 683                 err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
 684                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 685                 break;
 686
 687         case HCISETSCAN:
 688                 err = hci_request(hdev, hci_scan_req, dr.dev_opt,
 689                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 690                 break;
 691
 692         case HCISETPTYPE:
 693                 hdev->pkt_type = (__u16) dr.dev_opt;
 694                 break;
 695
 696         case HCISETLINKPOL:
 697                 hdev->link_policy = (__u16) dr.dev_opt;
 698                 break;
 699
 700         case HCISETLINKMODE:
 701                 hdev->link_mode = ((__u16) dr.dev_opt) & (HCI_LM_MASTER | HCI_LM_ACCEPT);
 702                 break;
 703
 704         case HCISETACLMTU:
 705                 hdev->acl_mtu  = *((__u16 *)&dr.dev_opt + 1);
 706                 hdev->acl_pkts = *((__u16 *)&dr.dev_opt + 0);
 707                 break;
 708
 709         case HCISETSCOMTU:
 710                 hdev->sco_mtu  = *((__u16 *)&dr.dev_opt + 1);
 711                 hdev->sco_pkts = *((__u16 *)&dr.dev_opt + 0);
 712                 break;
 713
 714         default:
 715                 err = -EINVAL;
 716                 break;
 717         }
 718         hci_dev_put(hdev);
 719         return err;
 720 }
 721
 722 int hci_get_dev_list(void __user *arg)
 723 {
 724         struct hci_dev_list_req *dl;
 725         struct hci_dev_req *dr;
 726         struct list_head *p;
 727         int n = 0, size, err;
 728         __u16 dev_num;
 729
 730         if (get_user(dev_num, (__u16 __user *) arg))
 731                 return -EFAULT;
 732
 733         if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
 734                 return -EINVAL;
 735
 736         size = sizeof(*dl) + dev_num * sizeof(*dr);
 737
 738         if (!(dl = kmalloc(size, GFP_KERNEL)))
 739                 return -ENOMEM;
 740
 741         dr = dl->dev_req;
 742
 743         read_lock_bh(&hci_dev_list_lock);
 744         list_for_each(p, &hci_dev_list) {
 745                 struct hci_dev *hdev;
 746                 hdev = list_entry(p, struct hci_dev, list);
 747                 (dr + n)->dev_id  = hdev->id;
 748                 (dr + n)->dev_opt = hdev->flags;
 749                 if (++n >= dev_num)
 750                         break;
 751         }
 752         read_unlock_bh(&hci_dev_list_lock);
 753
 754         dl->dev_num = n;
 755         size = sizeof(*dl) + n * sizeof(*dr);
 756
 757         err = copy_to_user(arg, dl, size);
 758         kfree(dl);
 759
 760         return err ? -EFAULT : 0;
 761 }
 762
 763 int hci_get_dev_info(void __user *arg)
 764 {
 765         struct hci_dev *hdev;
 766         struct hci_dev_info di;
 767         int err = 0;
 768
 769         if (copy_from_user(&di, arg, sizeof(di)))
 770                 return -EFAULT;
 771
 772         if (!(hdev = hci_dev_get(di.dev_id)))
 773                 return -ENODEV;
 774
 775         strcpy(di.name, hdev->name);
 776         di.bdaddr   = hdev->bdaddr;
 777         di.type     = hdev->type;
 778         di.flags    = hdev->flags;
 779         di.pkt_type = hdev->pkt_type;
 780         di.acl_mtu  = hdev->acl_mtu;
 781         di.acl_pkts = hdev->acl_pkts;
 782         di.sco_mtu  = hdev->sco_mtu;
 783         di.sco_pkts = hdev->sco_pkts;
 784         di.link_policy = hdev->link_policy;
 785         di.link_mode   = hdev->link_mode;
 786
 787         memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
 788         memcpy(&di.features, &hdev->features, sizeof(di.features));
 789
 790         if (copy_to_user(arg, &di, sizeof(di)))
 791                 err = -EFAULT;
 792
 793         hci_dev_put(hdev);
 794
 795         return err;
 796 }
 797
 798 /* ---- Interface to HCI drivers ---- */
 799
 800 /* Alloc HCI device */
 801 struct hci_dev *hci_alloc_dev(void)
 802 {
 803         struct hci_dev *hdev;
 804
 805         hdev = kzalloc(sizeof(struct hci_dev), GFP_KERNEL);
 806         if (!hdev)
 807                 return NULL;
 808
 809         skb_queue_head_init(&hdev->driver_init);
 810
 811         return hdev;
 812 }
 813 EXPORT_SYMBOL(hci_alloc_dev);
 814
 815 /* Free HCI device */
 816 void hci_free_dev(struct hci_dev *hdev)
 817 {
 818         skb_queue_purge(&hdev->driver_init);
 819
 820         /* will free via device release */
 821         put_device(&hdev->dev);
 822 }
 823 EXPORT_SYMBOL(hci_free_dev);
 824
 825 /* Register HCI device */
 826 int hci_register_dev(struct hci_dev *hdev)
 827 {
 828         struct list_head *head = &hci_dev_list, *p;
 829         int id = 0;
 830
 831         BT_DBG("%p name %s type %d owner %p", hdev, hdev->name, hdev->type, hdev->owner);
 832
 833         if (!hdev->open || !hdev->close || !hdev->destruct)
 834                 return -EINVAL;
 835
 836         write_lock_bh(&hci_dev_list_lock);
 837
 838         /* Find first available device id */
 839         list_for_each(p, &hci_dev_list) {
 840                 if (list_entry(p, struct hci_dev, list)->id != id)
 841                         break;
 842                 head = p; id++;
 843         }
 844
 845         sprintf(hdev->name, "hci%d", id);
 846         hdev->id = id;
 847         list_add(&hdev->list, head);
 848
 849         atomic_set(&hdev->refcnt, 1);
 850         spin_lock_init(&hdev->lock);
 851
 852         hdev->flags = 0;
 853         hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
 854         hdev->link_mode = (HCI_LM_ACCEPT);
 855
 856         hdev->idle_timeout = 0;
 857         hdev->sniff_max_interval = 800;
 858         hdev->sniff_min_interval = 80;
 859
 860         tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev);
 861         tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev);
 862         tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev);
 863
 864         skb_queue_head_init(&hdev->rx_q);
 865         skb_queue_head_init(&hdev->cmd_q);
 866         skb_queue_head_init(&hdev->raw_q);
 867
 868         init_waitqueue_head(&hdev->req_wait_q);
 869         init_MUTEX(&hdev->req_lock);
 870
 871         inquiry_cache_init(hdev);
 872
 873         hci_conn_hash_init(hdev);
 874
 875         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
 876
 877         atomic_set(&hdev->promisc, 0);
 878
 879         write_unlock_bh(&hci_dev_list_lock);
 880
 881         hci_register_sysfs(hdev);
 882
 883         hci_notify(hdev, HCI_DEV_REG);
 884
 885         return id;
 886 }
 887 EXPORT_SYMBOL(hci_register_dev);
 888
 889 /* Unregister HCI device */
 890 int hci_unregister_dev(struct hci_dev *hdev)
 891 {
 892         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 893
 894         hci_unregister_sysfs(hdev);
 895
 896         write_lock_bh(&hci_dev_list_lock);
 897         list_del(&hdev->list);
 898         write_unlock_bh(&hci_dev_list_lock);
 899
 900         hci_dev_do_close(hdev);
 901
 902         hci_notify(hdev, HCI_DEV_UNREG);
 903
 904         __hci_dev_put(hdev);
 905         return 0;
 906 }
 907 EXPORT_SYMBOL(hci_unregister_dev);
 908
 909 /* Suspend HCI device */
 910 int hci_suspend_dev(struct hci_dev *hdev)
 911 {
 912         hci_notify(hdev, HCI_DEV_SUSPEND);
 913         return 0;
 914 }
 915 EXPORT_SYMBOL(hci_suspend_dev);
 916
 917 /* Resume HCI device */
 918 int hci_resume_dev(struct hci_dev *hdev)
 919 {
 920         hci_notify(hdev, HCI_DEV_RESUME);
 921         return 0;
 922 }
 923 EXPORT_SYMBOL(hci_resume_dev);
 924
 925 /* ---- Interface to upper protocols ---- */
 926
 927 /* Register/Unregister protocols.
 928  * hci_task_lock is used to ensure that no tasks are running. */
 929 int hci_register_proto(struct hci_proto *hp)
 930 {
 931         int err = 0;
 932
 933         BT_DBG("%p name %s id %d", hp, hp->name, hp->id);
 934
 935         if (hp->id >= HCI_MAX_PROTO)
 936                 return -EINVAL;
 937
 938         write_lock_bh(&hci_task_lock);
 939
 940         if (!hci_proto[hp->id])
 941                 hci_proto[hp->id] = hp;
 942         else
 943                 err = -EEXIST;
 944
 945         write_unlock_bh(&hci_task_lock);
 946
 947         return err;
 948 }
 949 EXPORT_SYMBOL(hci_register_proto);
 950
 951 int hci_unregister_proto(struct hci_proto *hp)
 952 {
 953         int err = 0;
 954
 955         BT_DBG("%p name %s id %d", hp, hp->name, hp->id);
 956
 957         if (hp->id >= HCI_MAX_PROTO)
 958                 return -EINVAL;
 959
 960         write_lock_bh(&hci_task_lock);
 961
 962         if (hci_proto[hp->id])
 963                 hci_proto[hp->id] = NULL;
 964         else
 965                 err = -ENOENT;
 966
 967         write_unlock_bh(&hci_task_lock);
 968
 969         return err;
 970 }
 971 EXPORT_SYMBOL(hci_unregister_proto);
 972
 973 int hci_register_cb(struct hci_cb *cb)
 974 {
 975         BT_DBG("%p name %s", cb, cb->name);
 976
 977         write_lock_bh(&hci_cb_list_lock);
 978         list_add(&cb->list, &hci_cb_list);
 979         write_unlock_bh(&hci_cb_list_lock);
 980
 981         return 0;
 982 }
 983 EXPORT_SYMBOL(hci_register_cb);
 984
 985 int hci_unregister_cb(struct hci_cb *cb)
 986 {
 987         BT_DBG("%p name %s", cb, cb->name);
 988
 989         write_lock_bh(&hci_cb_list_lock);
 990         list_del(&cb->list);
 991         write_unlock_bh(&hci_cb_list_lock);
 992
 993         return 0;
 994 }
 995 EXPORT_SYMBOL(hci_unregister_cb);
 996
 997 static int hci_send_frame(struct sk_buff *skb)
 998 {
 999         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
1000
1001         if (!hdev) {
1002                 kfree_skb(skb);
1003                 return -ENODEV;
1004         }
1005
1006         BT_DBG("%s type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1007
1008         if (atomic_read(&hdev->promisc)) {
1009                 /* Time stamp */
1010                 __net_timestamp(skb);
1011
1012                 hci_send_to_sock(hdev, skb);
1013         }
1014
1015         /* Get rid of skb owner, prior to sending to the driver. */
1016         skb_orphan(skb);
1017
1018         return hdev->send(skb);
1019 }
1020
1021 /* Send HCI command */
1022 int hci_send_cmd(struct hci_dev *hdev, __u16 ogf, __u16 ocf, __u32 plen, void *param)
1023 {
1024         int len = HCI_COMMAND_HDR_SIZE + plen;
1025         struct hci_command_hdr *hdr;
1026         struct sk_buff *skb;
1027
1028         BT_DBG("%s ogf 0x%x ocf 0x%x plen %d", hdev->name, ogf, ocf, plen);
1029
1030         skb = bt_skb_alloc(len, GFP_ATOMIC);
1031         if (!skb) {
1032                 BT_ERR("%s Can't allocate memory for HCI command", hdev->name);
1033                 return -ENOMEM;
1034         }
1035
1036         hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE);
1037         hdr->opcode = __cpu_to_le16(hci_opcode_pack(ogf, ocf));
1038         hdr->plen   = plen;
1039
1040         if (plen)
1041                 memcpy(skb_put(skb, plen), param, plen);
1042
1043         BT_DBG("skb len %d", skb->len);
1044
1045         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
1046         skb->dev = (void *) hdev;
1047         skb_queue_tail(&hdev->cmd_q, skb);
1048         hci_sched_cmd(hdev);
1049
1050         return 0;
1051 }
1052
1053 /* Get data from the previously sent command */
1054 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 ogf, __u16 ocf)
1055 {
1056         struct hci_command_hdr *hdr;
1057
1058         if (!hdev->sent_cmd)
1059                 return NULL;
1060
1061         hdr = (void *) hdev->sent_cmd->data;
1062
1063         if (hdr->opcode != __cpu_to_le16(hci_opcode_pack(ogf, ocf)))
1064                 return NULL;
1065
1066         BT_DBG("%s ogf 0x%x ocf 0x%x", hdev->name, ogf, ocf);
1067
1068         return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE;
1069 }
1070
1071 /* Send ACL data */
1072 static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags)
1073 {
1074         struct hci_acl_hdr *hdr;
1075         int len = skb->len;
1076
1077         hdr = (struct hci_acl_hdr *) skb_push(skb, HCI_ACL_HDR_SIZE);
1078         hdr->handle = __cpu_to_le16(hci_handle_pack(handle, flags));
1079         hdr->dlen   = __cpu_to_le16(len);
1080
1081         skb->h.raw = (void *) hdr;
1082 }
1083
1084 int hci_send_acl(struct hci_conn *conn, struct sk_buff *skb, __u16 flags)
1085 {
1086         struct hci_dev *hdev = conn->hdev;
1087         struct sk_buff *list;
1088
1089         BT_DBG("%s conn %p flags 0x%x", hdev->name, conn, flags);
1090
1091         skb->dev = (void *) hdev;
1092         bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
1093         hci_add_acl_hdr(skb, conn->handle, flags | ACL_START);
1094
1095         if (!(list = skb_shinfo(skb)->frag_list)) {
1096                 /* Non fragmented */
1097                 BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);
1098
1099                 skb_queue_tail(&conn->data_q, skb);
1100         } else {
1101                 /* Fragmented */
1102                 BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
1103
1104                 skb_shinfo(skb)->frag_list = NULL;
1105
1106                 /* Queue all fragments atomically */
1107                 spin_lock_bh(&conn->data_q.lock);
1108
1109                 __skb_queue_tail(&conn->data_q, skb);
1110                 do {
1111                         skb = list; list = list->next;
1112
1113                         skb->dev = (void *) hdev;
1114                         bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
1115                         hci_add_acl_hdr(skb, conn->handle, flags | ACL_CONT);
1116
1117                         BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
1118
1119                         __skb_queue_tail(&conn->data_q, skb);
1120                 } while (list);
1121
1122                 spin_unlock_bh(&conn->data_q.lock);
1123         }
1124
1125         hci_sched_tx(hdev);
1126         return 0;
1127 }
1128 EXPORT_SYMBOL(hci_send_acl);
1129
1130 /* Send SCO data */
1131 int hci_send_sco(struct hci_conn *conn, struct sk_buff *skb)
1132 {
1133         struct hci_dev *hdev = conn->hdev;
1134         struct hci_sco_hdr hdr;
1135
1136         BT_DBG("%s len %d", hdev->name, skb->len);
1137
1138         if (skb->len > hdev->sco_mtu) {
1139                 kfree_skb(skb);
1140                 return -EINVAL;
1141         }
1142
1143         hdr.handle = __cpu_to_le16(conn->handle);
1144         hdr.dlen   = skb->len;
1145
1146         skb->h.raw = skb_push(skb, HCI_SCO_HDR_SIZE);
1147         memcpy(skb->h.raw, &hdr, HCI_SCO_HDR_SIZE);
1148
1149         skb->dev = (void *) hdev;
1150         bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
1151         skb_queue_tail(&conn->data_q, skb);
1152         hci_sched_tx(hdev);
1153         return 0;
1154 }
1155 EXPORT_SYMBOL(hci_send_sco);
1156
1157 /* ---- HCI TX task (outgoing data) ---- */
1158
1159 /* HCI Connection scheduler */
1160 static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int *quote)
1161 {
1162         struct hci_conn_hash *h = &hdev->conn_hash;
1163         struct hci_conn  *conn = NULL;
1164         int num = 0, min = ~0;
1165         struct list_head *p;
1166
1167         /* We don't have to lock device here. Connections are always
1168          * added and removed with TX task disabled. */
1169         list_for_each(p, &h->list) {
1170                 struct hci_conn *c;
1171                 c = list_entry(p, struct hci_conn, list);
1172
1173                 if (c->type != type || c->state != BT_CONNECTED
1174                                 || skb_queue_empty(&c->data_q))
1175                         continue;
1176                 num++;
1177
1178                 if (c->sent < min) {
1179                         min  = c->sent;
1180                         conn = c;
1181                 }
1182         }
1183
1184         if (conn) {
1185                 int cnt = (type == ACL_LINK ? hdev->acl_cnt : hdev->sco_cnt);
1186                 int q = cnt / num;
1187                 *quote = q ? q : 1;
1188         } else
1189                 *quote = 0;
1190
1191         BT_DBG("conn %p quote %d", conn, *quote);
1192         return conn;
1193 }
1194
1195 static inline void hci_acl_tx_to(struct hci_dev *hdev)
1196 {
1197         struct hci_conn_hash *h = &hdev->conn_hash;
1198         struct list_head *p;
1199         struct hci_conn  *c;
1200
1201         BT_ERR("%s ACL tx timeout", hdev->name);
1202
1203         /* Kill stalled connections */
1204         list_for_each(p, &h->list) {
1205                 c = list_entry(p, struct hci_conn, list);
1206                 if (c->type == ACL_LINK && c->sent) {
1207                         BT_ERR("%s killing stalled ACL connection %s",
1208                                 hdev->name, batostr(&c->dst));
1209                         hci_acl_disconn(c, 0x13);
1210                 }
1211         }
1212 }
1213
1214 static inline void hci_sched_acl(struct hci_dev *hdev)
1215 {
1216         struct hci_conn *conn;
1217         struct sk_buff *skb;
1218         int quote;
1219
1220         BT_DBG("%s", hdev->name);
1221
1222         if (!test_bit(HCI_RAW, &hdev->flags)) {
1223                 /* ACL tx timeout must be longer than maximum
1224                  * link supervision timeout (40.9 seconds) */
1225                 if (!hdev->acl_cnt && (jiffies - hdev->acl_last_tx) > (HZ * 45))
1226                         hci_acl_tx_to(hdev);
1227         }
1228
1229         while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, &quote))) {
1230                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
1231                         BT_DBG("skb %p len %d", skb, skb->len);
1232
1233                         hci_conn_enter_active_mode(conn);
1234
1235                         hci_send_frame(skb);
1236                         hdev->acl_last_tx = jiffies;
1237
1238                         hdev->acl_cnt--;
1239                         conn->sent++;
1240                 }
1241         }
1242 }
1243
1244 /* Schedule SCO */
1245 static inline void hci_sched_sco(struct hci_dev *hdev)
1246 {
1247         struct hci_conn *conn;
1248         struct sk_buff *skb;
1249         int quote;
1250
1251         BT_DBG("%s", hdev->name);
1252
1253         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
1254                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
1255                         BT_DBG("skb %p len %d", skb, skb->len);
1256                         hci_send_frame(skb);
1257
1258                         conn->sent++;
1259                         if (conn->sent == ~0)
1260                                 conn->sent = 0;
1261                 }
1262         }
1263 }
1264
1265 static void hci_tx_task(unsigned long arg)
1266 {
1267         struct hci_dev *hdev = (struct hci_dev *) arg;
1268         struct sk_buff *skb;
1269
1270         read_lock(&hci_task_lock);
1271
1272         BT_DBG("%s acl %d sco %d", hdev->name, hdev->acl_cnt, hdev->sco_cnt);
1273
1274         /* Schedule queues and send stuff to HCI driver */
1275
1276         hci_sched_acl(hdev);
1277
1278         hci_sched_sco(hdev);
1279
1280         /* Send next queued raw (unknown type) packet */
1281         while ((skb = skb_dequeue(&hdev->raw_q)))
1282                 hci_send_frame(skb);
1283
1284         read_unlock(&hci_task_lock);
1285 }
1286
1287 /* ----- HCI RX task (incoming data proccessing) ----- */
1288
1289 /* ACL data packet */
1290 static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
1291 {
1292         struct hci_acl_hdr *hdr = (void *) skb->data;
1293         struct hci_conn *conn;
1294         __u16 handle, flags;
1295
1296         skb_pull(skb, HCI_ACL_HDR_SIZE);
1297
1298         handle = __le16_to_cpu(hdr->handle);
1299         flags  = hci_flags(handle);
1300         handle = hci_handle(handle);
1301
1302         BT_DBG("%s len %d handle 0x%x flags 0x%x", hdev->name, skb->len, handle, flags);
1303
1304         hdev->stat.acl_rx++;
1305
1306         hci_dev_lock(hdev);
1307         conn = hci_conn_hash_lookup_handle(hdev, handle);
1308         hci_dev_unlock(hdev);
1309
1310         if (conn) {
1311                 register struct hci_proto *hp;
1312
1313                 hci_conn_enter_active_mode(conn);
1314
1315                 /* Send to upper protocol */
1316                 if ((hp = hci_proto[HCI_PROTO_L2CAP]) && hp->recv_acldata) {
1317                         hp->recv_acldata(conn, skb, flags);
1318                         return;
1319                 }
1320         } else {
1321                 BT_ERR("%s ACL packet for unknown connection handle %d",
1322                         hdev->name, handle);
1323         }
1324
1325         kfree_skb(skb);
1326 }
1327
1328 /* SCO data packet */
1329 static inline void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
1330 {
1331         struct hci_sco_hdr *hdr = (void *) skb->data;
1332         struct hci_conn *conn;
1333         __u16 handle;
1334
1335         skb_pull(skb, HCI_SCO_HDR_SIZE);
1336
1337         handle = __le16_to_cpu(hdr->handle);
1338
1339         BT_DBG("%s len %d handle 0x%x", hdev->name, skb->len, handle);
1340
1341         hdev->stat.sco_rx++;
1342
1343         hci_dev_lock(hdev);
1344         conn = hci_conn_hash_lookup_handle(hdev, handle);
1345         hci_dev_unlock(hdev);
1346
1347         if (conn) {
1348                 register struct hci_proto *hp;
1349
1350                 /* Send to upper protocol */
1351                 if ((hp = hci_proto[HCI_PROTO_SCO]) && hp->recv_scodata) {
1352                         hp->recv_scodata(conn, skb);
1353                         return;
1354                 }
1355         } else {
1356                 BT_ERR("%s SCO packet for unknown connection handle %d",
1357                         hdev->name, handle);
1358         }
1359
1360         kfree_skb(skb);
1361 }
1362
1363 static void hci_rx_task(unsigned long arg)
1364 {
1365         struct hci_dev *hdev = (struct hci_dev *) arg;
1366         struct sk_buff *skb;
1367
1368         BT_DBG("%s", hdev->name);
1369
1370         read_lock(&hci_task_lock);
1371
1372         while ((skb = skb_dequeue(&hdev->rx_q))) {
1373                 if (atomic_read(&hdev->promisc)) {
1374                         /* Send copy to the sockets */
1375                         hci_send_to_sock(hdev, skb);
1376                 }
1377
1378                 if (test_bit(HCI_RAW, &hdev->flags)) {
1379                         kfree_skb(skb);
1380                         continue;
1381                 }
1382
1383                 if (test_bit(HCI_INIT, &hdev->flags)) {
1384                         /* Don't process data packets in this states. */
1385                         switch (bt_cb(skb)->pkt_type) {
1386                         case HCI_ACLDATA_PKT:
1387                         case HCI_SCODATA_PKT:
1388                                 kfree_skb(skb);
1389                                 continue;
1390                         };
1391                 }
1392
1393                 /* Process frame */
1394                 switch (bt_cb(skb)->pkt_type) {
1395                 case HCI_EVENT_PKT:
1396                         hci_event_packet(hdev, skb);
1397                         break;
1398
1399                 case HCI_ACLDATA_PKT:
1400                         BT_DBG("%s ACL data packet", hdev->name);
1401                         hci_acldata_packet(hdev, skb);
1402                         break;
1403
1404                 case HCI_SCODATA_PKT:
1405                         BT_DBG("%s SCO data packet", hdev->name);
1406                         hci_scodata_packet(hdev, skb);
1407                         break;
1408
1409                 default:
1410                         kfree_skb(skb);
1411                         break;
1412                 }
1413         }
1414
1415         read_unlock(&hci_task_lock);
1416 }
1417
1418 static void hci_cmd_task(unsigned long arg)
1419 {
1420         struct hci_dev *hdev = (struct hci_dev *) arg;
1421         struct sk_buff *skb;
1422
1423         BT_DBG("%s cmd %d", hdev->name, atomic_read(&hdev->cmd_cnt));
1424
1425         if (!atomic_read(&hdev->cmd_cnt) && (jiffies - hdev->cmd_last_tx) > HZ) {
1426                 BT_ERR("%s command tx timeout", hdev->name);
1427                 atomic_set(&hdev->cmd_cnt, 1);
1428         }
1429
1430         /* Send queued commands */
1431         if (atomic_read(&hdev->cmd_cnt) && (skb = skb_dequeue(&hdev->cmd_q))) {
1432                 if (hdev->sent_cmd)
1433                         kfree_skb(hdev->sent_cmd);
1434
1435                 if ((hdev->sent_cmd = skb_clone(skb, GFP_ATOMIC))) {
1436                         atomic_dec(&hdev->cmd_cnt);
1437                         hci_send_frame(skb);
1438                         hdev->cmd_last_tx = jiffies;
1439                 } else {
1440                         skb_queue_head(&hdev->cmd_q, skb);
1441                         hci_sched_cmd(hdev);
1442                 }
1443         }
1444 }