summaryrefslogtreecommitdiff
path: root/net/bluetooth/hci_core.c
blob: cd061510b6bd8356140c428a1187235e87ed31dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth HCI core. */

#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/kmod.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <net/sock.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

static void hci_cmd_task(unsigned long arg);
static void hci_rx_task(unsigned long arg);
static void hci_tx_task(unsigned long arg);
static void hci_notify(struct hci_dev *hdev, int event);

static DEFINE_RWLOCK(hci_task_lock);

/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);

/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_RWLOCK(hci_cb_list_lock);

/* HCI protocols */
#define HCI_MAX_PROTO	2
struct hci_proto *hci_proto[HCI_MAX_PROTO];

/* HCI notifiers list */
static ATOMIC_NOTIFIER_HEAD(hci_notifier);

/* ---- HCI notifications ---- */

int hci_register_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&hci_notifier, nb);
}

int hci_unregister_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&hci_notifier, nb);
}

static void hci_notify(struct hci_dev *hdev, int event)
{
	atomic_notifier_call_chain(&hci_notifier, event, hdev);
}

/* ---- HCI requests ---- */

void hci_req_complete(struct hci_dev *hdev, int result)
{
	BT_DBG("%s result 0x%2.2x", hdev->name, result);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = result;
		hdev->req_status = HCI_REQ_DONE;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

static void hci_req_cancel(struct hci_dev *hdev, int err)
{
	BT_DBG("%s err 0x%2.2x", hdev->name, err);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = err;
		hdev->req_status = HCI_REQ_CANCELED;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

/* Execute request and wait for completion. */
static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
				unsigned long opt, __u32 timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

	BT_DBG("%s start", hdev->name);

	hdev->req_status = HCI_REQ_PEND;

	add_wait_queue(&hdev->req_wait_q, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	req(hdev, opt);
	schedule_timeout(timeout);

	remove_wait_queue(&hdev->req_wait_q, &wait);

	if (signal_pending(current))
		return -EINTR;

	switch (hdev->req_status) {
	case HCI_REQ_DONE:
		err = -bt_err(hdev->req_result);
		break;

	case HCI_REQ_CANCELED:
		err = -hdev->req_result;
		break;

	default:
		err = -ETIMEDOUT;
		break;
	}

	hdev->req_status = hdev->req_result = 0;

	BT_DBG("%s end: err %d", hdev->name, err);

	return err;
}

static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
				unsigned long opt, __u32 timeout)
{
	int ret;

	if (!test_bit(HCI_UP, &hdev->flags))
		return -ENETDOWN;

	/* Serialize all requests */
	hci_req_lock(hdev);
	ret = __hci_request(hdev, req, opt, timeout);
	hci_req_unlock(hdev);

	return ret;
}

static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s %ld", hdev->name, opt);

	/* Reset device */
	hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
}

static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
{
	struct sk_buff *skb;
	__le16 param;
	__u8 flt_type;

	BT_DBG("%s %ld", hdev->name, opt);

	/* Driver initialization */

	/* Special commands */
	while ((skb = skb_dequeue(&hdev->driver_init))) {
		bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
		skb->dev = (void *) hdev;
		skb_queue_tail(&hdev->cmd_q, skb);
		hci_sched_cmd(hdev);
	}
	skb_queue_purge(&hdev->driver_init);

	/* Mandatory initialization */

	/* Reset */
	if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks))
			hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);

	/* Read Local Supported Features */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);

	/* Read Local Version */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL);

	/* Read Buffer Size (ACL mtu, max pkt, etc.) */
	hci_send_cmd(hdev, HCI_OP_READ_BUFFER_SIZE, 0, NULL);

#if 0
	/* Host buffer size */
	{
		struct hci_cp_host_buffer_size cp;
		cp.acl_mtu = cpu_to_le16(HCI_MAX_ACL_SIZE);
		cp.sco_mtu = HCI_MAX_SCO_SIZE;
		cp.acl_max_pkt = cpu_to_le16(0xffff);
		cp.sco_max_pkt = cpu_to_le16(0xffff);
		hci_send_cmd(hdev, HCI_OP_HOST_BUFFER_SIZE, sizeof(cp), &cp);
	}
#endif

	/* Read BD Address */
	hci_send_cmd(hdev, HCI_OP_READ_BD_ADDR, 0, NULL);

	/* Read Class of Device */
	hci_send_cmd(hdev, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);

	/* Read Local Name */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_NAME, 0, NULL);

	/* Read Voice Setting */
	hci_send_cmd(hdev, HCI_OP_READ_VOICE_SETTING, 0, NULL);

	/* Optional initialization */

	/* Clear Event Filters */
	flt_type = HCI_FLT_CLEAR_ALL;
	hci_send_cmd(hdev, HCI_OP_SET_EVENT_FLT, 1, &flt_type);

	/* Page timeout ~20 secs */
	param = cpu_to_le16(0x8000);
	hci_send_cmd(hdev, HCI_OP_WRITE_PG_TIMEOUT, 2, &param);

	/* Connection accept timeout ~20 secs */
	param = cpu_to_le16(0x7d00);
	hci_send_cmd(hdev, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);
}

static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 scan = opt;

	BT_DBG("%s %x", hdev->name, scan);

	/* Inquiry and Page scans */
	hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
}

static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 auth = opt;

	BT_DBG("%s %x", hdev->name, auth);

	/* Authentication */
	hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
}

static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 encrypt = opt;

	BT_DBG("%s %x", hdev->name, encrypt);

	/* Encryption */
	hci_send_cmd(hdev, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
}

static void hci_linkpol_req(struct hci_dev *hdev, unsigned long opt)
{
	__le16 policy = cpu_to_le16(opt);

	BT_DBG("%s %x", hdev->name, policy);

	/* Default link policy */
	hci_send_cmd(hdev, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
}

/* Get HCI device by index.
 * Device is held on return. */
struct hci_dev *hci_dev_get(int index)
{
	struct hci_dev *hdev = NULL;
	struct list_head *p;

	BT_DBG("%d", index);

	if (index < 0)
		return NULL;

	read_lock(&hci_dev_list_lock);
	list_for_each(p, &hci_dev_list) {
		struct hci_dev *d = list_entry(p, struct hci_dev, list);
		if (d->id == index) {
			hdev = hci_dev_hold(d);
			break;
		}
	}
	read_unlock(&hci_dev_list_lock);
	return hdev;
}

/* ---- Inquiry support ---- */
static void inquiry_cache_flush(struct hci_dev *hdev)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *next  = cache->list, *e;

	BT_DBG("cache %p", cache);

	cache->list = NULL;
	while ((e = next)) {
		next = e->next;
		kfree(e);
	}
}

struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(bdaddr));

	for (e = cache->list; e; e = e->next)
		if (!bacmp(&e->data.bdaddr, bdaddr))
			break;
	return e;
}

void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr));

	if (!(e = hci_inquiry_cache_lookup(hdev, &data->bdaddr))) {
		/* Entry not in the cache. Add new one. */
		if (!(e = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC)))
			return;
		e->next     = cache->list;
		cache->list = e;
	}

	memcpy(&e->data, data, sizeof(*data));
	e->timestamp = jiffies;
	cache->timestamp = jiffies;
}

static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_info *info = (struct inquiry_info *) buf;
	struct inquiry_entry *e;
	int copied = 0;

	for (e = cache->list; e && copied < num; e = e->next, copied++) {
		struct inquiry_data *data = &e->data;
		bacpy(&info->bdaddr, &data->bdaddr);
		info->pscan_rep_mode	= data->pscan_rep_mode;
		info->pscan_period_mode	= data->pscan_period_mode;
		info->pscan_mode	= data->pscan_mode;
		memcpy(info->dev_class, data->dev_class, 3);
		info->clock_offset	= data->clock_offset;
		info++;
	}

	BT_DBG("cache %p, copied %d", cache, copied);
	return copied;
}

static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
{
	struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
	struct hci_cp_inquiry cp;

	BT_DBG("%s", hdev->name);

	if (test_bit(HCI_INQUIRY, &hdev->flags))
		return;

	/* Start Inquiry */
	memcpy(&cp.lap, &ir->lap, 3);
	cp.length  = ir->length;
	cp.num_rsp = ir->num_rsp;
	hci_send_cmd(hdev, HCI_OP_INQUIRY, sizeof(cp), &cp);
}

int hci_inquiry(void __user *arg)
{
	__u8 __user *ptr = arg;
	struct hci_inquiry_req ir;
	struct hci_dev *hdev;
	int err = 0, do_inquiry = 0, max_rsp;
	long timeo;
	__u8 *buf;

	if (copy_from_user(&ir, ptr, sizeof(ir)))
		return -EFAULT;

	if (!(hdev = hci_dev_get(ir.dev_id)))
		return -ENODEV;

	hci_dev_lock_bh(hdev);
	if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
					inquiry_cache_empty(hdev) ||
					ir.flags & IREQ_CACHE_FLUSH) {
		inquiry_cache_flush(hdev);
		do_inquiry = 1;
	}
	hci_dev_unlock_bh(hdev);

	timeo = ir.length * msecs_to_jiffies(2000);
	if (do_inquiry && (err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo)) < 0)
		goto done;

	/* for unlimited number of responses we will use buffer with 255 entries */
	max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;

	/* cache_dump can't sleep. Therefore we allocate temp buffer and then
	 * copy it to the user space.
	 */
	if (!(buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL))) {
		err = -ENOMEM;
		goto done;
	}

	hci_dev_lock_bh(hdev);
	ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
	hci_dev_unlock_bh(hdev);

	BT_DBG("num_rsp %d", ir.num_rsp);

	if (!copy_to_user(ptr, &ir, sizeof(ir))) {
		ptr += sizeof(ir);
		if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
					ir.num_rsp))
			err = -EFAULT;
	} else
		err = -EFAULT;

	kfree(buf);

done:
	hci_dev_put(hdev);
	return err;
}

/* ---- HCI ioctl helpers ---- */

int hci_dev_open(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	if (!(hdev = hci_dev_get(dev)))
		return -ENODEV;

	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_lock(hdev);

	if (test_bit(HCI_UP, &hdev->flags)) {
		ret = -EALREADY;
		goto done;
	}

	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
		set_bit(HCI_RAW, &hdev->flags);

	if (hdev->open(hdev)) {
		ret = -EIO;
		goto done;
	}

	if (!test_bit(HCI_RAW, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		set_bit(HCI_INIT, &hdev->flags);

		//__hci_request(hdev, hci_reset_req, 0, HZ);
		ret = __hci_request(hdev, hci_init_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		clear_bit(HCI_INIT, &hdev->flags);
	}

	if (!ret) {
		hci_dev_hold(hdev);
		set_bit(HCI_UP, &hdev->flags);
		hci_notify(hdev, HCI_DEV_UP);
	} else {
		/* Init failed, cleanup */
		tasklet_kill(&hdev->rx_task);
		tasklet_kill(&hdev->tx_task);
		tasklet_kill(&hdev->cmd_task);

		skb_queue_purge(&hdev->cmd_q);
		skb_queue_purge(&hdev->rx_q);

		if (hdev->flush)
			hdev->flush(hdev);

		if (hdev->sent_cmd) {
			kfree_skb(hdev->sent_cmd);
			hdev->sent_cmd = NULL;
		}

		hdev->close(hdev);
		hdev->flags = 0;
	}

done:
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

static int hci_dev_do_close(struct hci_dev *hdev)
{
	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_cancel(hdev, ENODEV);
	hci_req_lock(hdev);

	if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
		hci_req_unlock(hdev);
		return 0;
	}

	/* Kill RX and TX tasks */
	tasklet_kill(&hdev->rx_task);
	tasklet_kill(&hdev->tx_task);

	hci_dev_lock_bh(hdev);
	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
	hci_dev_unlock_bh(hdev);

	hci_notify(hdev, HCI_DEV_DOWN);

	if (hdev->flush)
		hdev->flush(hdev);

	/* Reset device */
	skb_queue_purge(&hdev->cmd_q);
	atomic_set(&hdev->cmd_cnt, 1);
	if (!test_bit(HCI_RAW, &hdev->flags)) {
		set_bit(HCI_INIT, &hdev->flags);
		__hci_request(hdev, hci_reset_req, 0,
					msecs_to_jiffies(250));
		clear_bit(HCI_INIT, &hdev->flags);
	}

	/* Kill cmd task */
	tasklet_kill(&hdev->cmd_task);

	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);
	skb_queue_purge(&hdev->raw_q);

	/* Drop last sent command */
	if (hdev->sent_cmd) {
		kfree_skb(hdev->sent_cmd);
		hdev->sent_cmd = NULL;
	}

	/* After this point our queues are empty
	 * and no tasks are scheduled. */
	hdev->close(hdev);

	/* Clear flags */
	hdev->flags = 0;

	hci_req_unlock(hdev);

	hci_dev_put(hdev);
	return 0;
}

int hci_dev_close(__u16 dev)
{
	struct hci_dev *hdev;
	int err;

	if (!(hdev = hci_dev_get(dev)))
		return -ENODEV;
	err = hci_dev_do_close(hdev);
	hci_dev_put(hdev);
	return err;
}

int hci_dev_reset(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	if (!(hdev = hci_dev_get(dev)))
		return -ENODEV;

	hci_req_lock(hdev);
	tasklet_disable(&hdev->tx_task);

	if (!test_bit(HCI_UP, &hdev->flags))
		goto done;

	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);

	hci_dev_lock_bh(hdev);
	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
	hci_dev_unlock_bh(hdev);

	if (hdev->flush)
		hdev->flush(hdev);

	atomic_set(&hdev->cmd_cnt, 1);
	hdev->acl_cnt = 0; hdev->sco_cnt = 0;

	if (!test_bit(HCI_RAW, &hdev->flags))
		ret = __hci_request(hdev, hci_reset_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

done:
	tasklet_enable(&hdev->tx_task);
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

int hci_dev_reset_stat(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	if (!(hdev = hci_dev_get(dev)))
		return -ENODEV;

	memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));

	hci_dev_put(hdev);

	return ret;
}

int hci_dev_cmd(unsigned int cmd, void __user *arg)
{
	struct hci_dev *hdev;
	struct hci_dev_req dr;
	int err = 0;

	if (copy_from_user(&dr, arg, sizeof(dr)))
		return -EFAULT;

	if (!(hdev = hci_dev_get(dr.dev_id)))
		return -ENODEV;

	switch (cmd) {
	case HCISETAUTH:
		err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETENCRYPT:
		if (!lmp_encrypt_capable(hdev)) {
			err = -EOPNOTSUPP;
			break;
		}

		if (!test_bit(HCI_AUTH, &hdev->flags)) {
			/* Auth must be enabled first */
			err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
			if (err)
				break;
		}

		err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETSCAN:
		err = hci_request(hdev, hci_scan_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETLINKPOL:
		err = hci_request(hdev, hci_linkpol_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETLINKMODE:
		hdev->link_mode = ((__u16) dr.dev_opt) &
					(HCI_LM_MASTER | HCI_LM_ACCEPT);
		break;

	case HCISETPTYPE:
		hdev->pkt_type = (__u16) dr.dev_opt;
		break;

	case HCISETACLMTU:
		hdev->acl_mtu  = *((__u16 *) &dr.dev_opt + 1);
		hdev->acl_pkts = *((__u16 *) &dr.dev_opt + 0);
		break;

	case HCISETSCOMTU:
		hdev->sco_mtu  = *((__u16 *) &dr.dev_opt + 1);
		hdev->sco_pkts = *((__u16 *) &dr.dev_opt + 0);
		break;

	default:
		err = -EINVAL;
		break;
	}

	hci_dev_put(hdev);
	return err;
}

int hci_get_dev_list(void __user *arg)
{
	struct hci_dev_list_req *dl;
	struct hci_dev_req *dr;
	struct list_head *p;
	int n = 0, size, err;
	__u16 dev_num;

	if (get_user(dev_num, (__u16 __user *) arg))
		return -EFAULT;

	if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
		return -EINVAL;

	size = sizeof(*dl) + dev_num * sizeof(*dr);

	if (!(dl = kzalloc(size, GFP_KERNEL)))
		return -ENOMEM;

	dr = dl->dev_req;

	read_lock_bh(&hci_dev_list_lock);
	list_for_each(p, &hci_dev_list) {
		struct hci_dev *hdev;
		hdev = list_entry(p, struct hci_dev, list);
		(dr + n)->dev_id  = hdev->id;
		(dr + n)->dev_opt = hdev->flags;
		if (++n >= dev_num)
			break;
	}
	read_unlock_bh(&hci_dev_list_lock);

	dl->dev_num = n;
	size = sizeof(*dl) + n * sizeof(*dr);

	err = copy_to_user(arg, dl, size);
	kfree(dl);

	return err ? -EFAULT : 0;
}

int hci_get_dev_info(void __user *arg)
{
	struct hci_dev *hdev;
	struct hci_dev_info di;
	int err = 0;

	if (copy_from_user(&di, arg, sizeof(di)))
		return -EFAULT;

	if (!(hdev = hci_dev_get(di.dev_id)))
		return -ENODEV;

	strcpy(di.name, hdev->name);
	di.bdaddr   = hdev->bdaddr;
	di.type     = hdev->type;
	di.flags    = hdev->flags;
	di.pkt_type = hdev->pkt_type;
	di.acl_mtu  = hdev->acl_mtu;
	di.acl_pkts = hdev->acl_pkts;
	di.sco_mtu  = hdev->sco_mtu;
	di.sco_pkts = hdev->sco_pkts;
	di.link_policy = hdev->link_policy;
	di.link_mode   = hdev->link_mode;

	memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
	memcpy(&di.features, &hdev->features, sizeof(di.features));

	if (copy_to_user(arg, &di, sizeof(di)))
		err = -EFAULT;

	hci_dev_put(hdev);

	return err;
}

/* ---- Interface to HCI drivers ---- */

/* Alloc HCI device */
struct hci_dev *hci_alloc_dev(void)
{
	struct hci_dev *hdev;

	hdev = kzalloc(sizeof(struct hci_dev), GFP_KERNEL);
	if (!hdev)
		return NULL;

	skb_queue_head_init(&hdev->driver_init);

	return hdev;
}
EXPORT_SYMBOL(hci_alloc_dev);

/* Free HCI device */
void hci_free_dev(struct hci_dev *hdev)
{
	skb_queue_purge(&hdev->driver_init);

	/* will free via device release */
	put_device(&hdev->dev);
}
EXPORT_SYMBOL(hci_free_dev);

/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
	struct list_head *head = &hci_dev_list, *p;
	int i, id = 0;

	BT_DBG("%p name %s type %d owner %p", hdev, hdev->name, hdev->type, hdev->owner);

	if (!hdev->open || !hdev->close || !hdev->destruct)
		return -EINVAL;

	write_lock_bh(&hci_dev_list_lock);

	/* Find first available device id */
	list_for_each(p, &hci_dev_list) {
		if (list_entry(p, struct hci_dev, list)->id != id)
			break;
		head = p; id++;
	}

	sprintf(hdev->name, "hci%d", id);
	hdev->id = id;
	list_add(&hdev->list, head);

	atomic_set(&hdev->refcnt, 1);
	spin_lock_init(&hdev->lock);

	hdev->flags = 0;
	hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
	hdev->esco_type = (ESCO_HV1);
	hdev->link_mode = (HCI_LM_ACCEPT);

	hdev->idle_timeout = 0;
	hdev->sniff_max_interval = 800;
	hdev->sniff_min_interval = 80;

	tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev);
	tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev);
	tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev);

	skb_queue_head_init(&hdev->rx_q);
	skb_queue_head_init(&hdev->cmd_q);
	skb_queue_head_init(&hdev->raw_q);

	for (i = 0; i < 3; i++)
		hdev->reassembly[i] = NULL;

	init_waitqueue_head(&hdev->req_wait_q);
	init_MUTEX(&hdev->req_lock);

	inquiry_cache_init(hdev);

	hci_conn_hash_init(hdev);

	memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));

	atomic_set(&hdev->promisc, 0);

	write_unlock_bh(&hci_dev_list_lock);

	hci_register_sysfs(hdev);

	hci_notify(hdev, HCI_DEV_REG);

	return id;
}
EXPORT_SYMBOL(hci_register_dev);

/* Unregister HCI device */
int hci_unregister_dev(struct hci_dev *hdev)
{
	int i;

	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);

	write_lock_bh(&hci_dev_list_lock);
	list_del(&hdev->list);
	write_unlock_bh(&hci_dev_list_lock);

	hci_dev_do_close(hdev);

	for (i = 0; i < 3; i++)
		kfree_skb(hdev->reassembly[i]);

	hci_notify(hdev, HCI_DEV_UNREG);

	hci_unregister_sysfs(hdev);

	__hci_dev_put(hdev);

	return 0;
}
EXPORT_SYMBOL(hci_unregister_dev);

/* Suspend HCI device */
int hci_suspend_dev(struct hci_dev *hdev)
{
	hci_notify(hdev, HCI_DEV_SUSPEND);
	return 0;
}
EXPORT_SYMBOL(hci_suspend_dev);

/* Resume HCI device */
int hci_resume_dev(struct hci_dev *hdev)
{
	hci_notify(hdev, HCI_DEV_RESUME);
	return 0;
}
EXPORT_SYMBOL(hci_resume_dev);

/* Receive packet type fragment */
#define __reassembly(hdev, type)  ((hdev)->reassembly[(type) - 2])

int hci_recv_fragment(struct hci_dev *hdev, int type, void *data, int count)
{
	if (type < HCI_ACLDATA_PKT || type > HCI_EVENT_PKT)
		return -EILSEQ;

	while (count) {
		struct sk_buff *skb = __reassembly(hdev, type);
		struct { int expect; } *scb;
		int len = 0;

		if (!skb) {
			/* Start of the frame */

			switch (type) {
			case HCI_EVENT_PKT:
				if (count >= HCI_EVENT_HDR_SIZE) {
					struct hci_event_hdr *h = data;
					len = HCI_EVENT_HDR_SIZE + h->plen;
				} else
					return -EILSEQ;
				break;

			case HCI_ACLDATA_PKT:
				if (count >= HCI_ACL_HDR_SIZE) {
					struct hci_acl_hdr *h = data;
					len = HCI_ACL_HDR_SIZE + __le16_to_cpu(h->dlen);
				} else
					return -EILSEQ;
				break;

			case HCI_SCODATA_PKT:
				if (count >= HCI_SCO_HDR_SIZE) {
					struct hci_sco_hdr *h = data;
					len = HCI_SCO_HDR_SIZE + h->dlen;
				} else
					return -EILSEQ;
				break;
			}

			skb = bt_skb_alloc(len, GFP_ATOMIC);
			if (!skb) {
				BT_ERR("%s no memory for packet", hdev->name);
				return -ENOMEM;
			}

			skb->dev = (void *) hdev;
			bt_cb(skb)->pkt_type = type;

			__reassembly(hdev, type) = skb;

			scb = (void *) skb->cb;
			scb->expect = len;
		} else {
			/* Continuation */

			scb = (void *) skb->cb;
			len = scb->expect;
		}

		len = min(len, count);

		memcpy(skb_put(skb, len), data, len);

		scb->expect -= len;

		if (scb->expect == 0) {
			/* Complete frame */

			__reassembly(hdev, type) = NULL;

			bt_cb(skb)->pkt_type = type;
			hci_recv_frame(skb);
		}

		count -= len; data += len;
	}

	return 0;
}
EXPORT_SYMBOL(hci_recv_fragment);

/* ---- Interface to upper protocols ---- */

/* Register/Unregister protocols.
 * hci_task_lock is used to ensure that no tasks are running. */
int hci_register_proto(struct hci_proto *hp)
{
	int err = 0;

	BT_DBG("%p name %s id %d", hp, hp->name, hp->id);

	if (hp->id >= HCI_MAX_PROTO)
		return -EINVAL;

	write_lock_bh(&hci_task_lock);

	if (!hci_proto[hp->id])
		hci_proto[hp->id] = hp;
	else
		err = -EEXIST;

	write_unlock_bh(&hci_task_lock);

	return err;
}
EXPORT_SYMBOL(hci_register_proto);

int hci_unregister_proto(struct hci_proto *hp)
{
	int err = 0;

	BT_DBG("%p name %s id %d", hp, hp->name, hp->id);

	if (hp->id >= HCI_MAX_PROTO)
		return -EINVAL;

	write_lock_bh(&hci_task_lock);

	if (hci_proto[hp->id])
		hci_proto[hp->id] = NULL;
	else
		err = -ENOENT;

	write_unlock_bh(&hci_task_lock);

	return err;
}
EXPORT_SYMBOL(hci_unregister_proto);

int hci_register_cb(struct hci_cb *cb)
{
	BT_DBG("%p name %s", cb, cb->name);

	write_lock_bh(&hci_cb_list_lock);
	list_add(&cb->list, &hci_cb_list);
	write_unlock_bh(&hci_cb_list_lock);

	return 0;
}
EXPORT_SYMBOL(hci_register_cb);

int hci_unregister_cb(struct hci_cb *cb)
{
	BT_DBG("%p name %s", cb, cb->name);

	write_lock_bh(&hci_cb_list_lock);
	list_del(&cb->list);
	write_unlock_bh(&hci_cb_list_lock);

	return 0;
}
EXPORT_SYMBOL(hci_unregister_cb);

static int hci_send_frame(struct sk_buff *skb)
{
	struct hci_dev *hdev = (struct hci_dev *) skb->dev;

	if (!hdev) {
		kfree_skb(skb);
		return -ENODEV;
	}

	BT_DBG("%s type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);

	if (atomic_read(&hdev->promisc)) {
		/* Time stamp */
		__net_timestamp(skb);

		hci_send_to_sock(hdev, skb);
	}

	/* Get rid of skb owner, prior to sending to the driver. */
	skb_orphan(skb);

	return hdev->send(skb);
}

/* Send HCI command */
int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param)
{
	int len = HCI_COMMAND_HDR_SIZE + plen;
	struct hci_command_hdr *hdr;
	struct sk_buff *skb;

	BT_DBG("%s opcode 0x%x plen %d", hdev->name, opcode, plen);

	skb = bt_skb_alloc(len, GFP_ATOMIC);
	if (!skb) {
		BT_ERR("%s no memory for command", hdev->name);
		return -ENOMEM;
	}

	hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE);
	hdr->opcode = cpu_to_le16(opcode);
	hdr->plen   = plen;

	if (plen)
		memcpy(skb_put(skb, plen), param, plen);

	BT_DBG("skb len %d", skb->len);

	bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
	skb->dev = (void *) hdev;
	skb_queue_tail(&hdev->cmd_q, skb);
	hci_sched_cmd(hdev);

	return 0;
}

/* Get data from the previously sent command */
void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
{
	struct hci_command_hdr *hdr;

	if (!hdev->sent_cmd)
		return NULL;

	hdr = (void *) hdev->sent_cmd->data;

	if (hdr->opcode != cpu_to_le16(opcode))
		return NULL;

	BT_DBG("%s opcode 0x%x", hdev->name, opcode);

	return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE;
}

/* Send ACL data */
static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags)
{
	struct hci_acl_hdr *hdr;
	int len = skb->len;

	skb_push(skb, HCI_ACL_HDR_SIZE);
	skb_reset_transport_header(skb);
	hdr = (struct hci_acl_hdr *)skb_transport_header(skb);
	hdr->handle = cpu_to_le16(hci_handle_pack(handle, flags));
	hdr->dlen   = cpu_to_le16(len);
}

int hci_send_acl(struct hci_conn *conn, struct sk_buff *skb, __u16 flags)
{
	struct hci_dev *hdev = conn->hdev;
	struct sk_buff *list;

	BT_DBG("%s conn %p flags 0x%x", hdev->name, conn, flags);

	skb->dev = (void *) hdev;
	bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
	hci_add_acl_hdr(skb, conn->handle, flags | ACL_START);

	if (!(list = skb_shinfo(skb)->frag_list)) {
		/* Non fragmented */
		BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);

		skb_queue_tail(&conn->data_q, skb);
	} else {
		/* Fragmented */
		BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);

		skb_shinfo(skb)->frag_list = NULL;

		/* Queue all fragments atomically */
		spin_lock_bh(&conn->data_q.lock);

		__skb_queue_tail(&conn->data_q, skb);
		do {
			skb = list; list = list->next;

			skb->dev = (void *) hdev;
			bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
			hci_add_acl_hdr(skb, conn->handle, flags | ACL_CONT);

			BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);

			__skb_queue_tail(&conn->data_q, skb);
		} while (list);

		spin_unlock_bh(&conn->data_q.lock);
	}

	hci_sched_tx(hdev);
	return 0;
}
EXPORT_SYMBOL(hci_send_acl);

/* Send SCO data */
int hci_send_sco(struct hci_conn *conn, struct sk_buff *skb)
{
	struct hci_dev *hdev = conn->hdev;
	struct hci_sco_hdr hdr;

	BT_DBG("%s len %d", hdev->name, skb->len);

	if (skb->len > hdev->sco_mtu) {
		kfree_skb(skb);
		return -EINVAL;
	}

	hdr.handle = cpu_to_le16(conn->handle);
	hdr.dlen   = skb->len;

	skb_push(skb, HCI_SCO_HDR_SIZE);
	skb_reset_transport_header(skb);
	memcpy(skb_transport_header(skb), &hdr, HCI_SCO_HDR_SIZE);

	skb->dev = (void *) hdev;
	bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
	skb_queue_tail(&conn->data_q, skb);
	hci_sched_tx(hdev);
	return 0;
}
EXPORT_SYMBOL(hci_send_sco);

/* ---- HCI TX task (outgoing data) ---- */

/* HCI Connection scheduler */
static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int *quote)
{
	struct hci_conn_hash *h = &hdev->conn_hash;
	struct hci_conn *conn = NULL;
	int num = 0, min = ~0;
	struct list_head *p;

	/* We don't have to lock device here. Connections are always
	 * added and removed with TX task disabled. */
	list_for_each(p, &h->list) {
		struct hci_conn *c;
		c = list_entry(p, struct hci_conn, list);

		if (c->type != type || skb_queue_empty(&c->data_q))
			continue;

		if (c->state != BT_CONNECTED && c->state != BT_CONFIG)
			continue;

		num++;

		if (c->sent < min) {
			min  = c->sent;
			conn = c;
		}
	}

	if (conn) {
		int cnt = (type == ACL_LINK ? hdev->acl_cnt : hdev->sco_cnt);
		int q = cnt / num;
		*quote = q ? q : 1;
	} else
		*quote = 0;

	BT_DBG("conn %p quote %d", conn, *quote);
	return conn;
}

static inline void hci_acl_tx_to(struct hci_dev *hdev)
{
	struct hci_conn_hash *h = &hdev->conn_hash;
	struct list_head *p;
	struct hci_conn  *c;

	BT_ERR("%s ACL tx timeout", hdev->name);

	/* Kill stalled connections */
	list_for_each(p, &h->list) {
		c = list_entry(p, struct hci_conn, list);
		if (c->type == ACL_LINK && c->sent) {
			BT_ERR("%s killing stalled ACL connection %s",
				hdev->name, batostr(&c->dst));
			hci_acl_disconn(c, 0x13);
		}
	}
}

static inline void hci_sched_acl(struct hci_dev *hdev)
{
	struct hci_conn *conn;
	struct sk_buff *skb;
	int quote;

	BT_DBG("%s", hdev->name);

	if (!test_bit(HCI_RAW, &hdev->flags)) {
		/* ACL tx timeout must be longer than maximum
		 * link supervision timeout (40.9 seconds) */
		if (!hdev->acl_cnt && time_after(jiffies, hdev->acl_last_tx + HZ * 45))
			hci_acl_tx_to(hdev);
	}

	while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, &quote))) {
		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
			BT_DBG("skb %p len %d", skb, skb->len);

			hci_conn_enter_active_mode(conn);

			hci_send_frame(skb);
			hdev->acl_last_tx = jiffies;

			hdev->acl_cnt--;
			conn->sent++;
		}
	}
}

/* Schedule SCO */
static inline void hci_sched_sco(struct hci_dev *hdev)
{
	struct hci_conn *conn;
	struct sk_buff *skb;
	int quote;

	BT_DBG("%s", hdev->name);

	while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
			BT_DBG("skb %p len %d", skb, skb->len);
			hci_send_frame(skb);

			conn->sent++;
			if (conn->sent == ~0)
				conn->sent = 0;
		}
	}
}

static inline void hci_sched_esco(struct hci_dev *hdev)
{
	struct hci_conn *conn;
	struct sk_buff *skb;
	int quote;

	BT_DBG("%s", hdev->name);

	while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK, &quote))) {
		while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
			BT_DBG("skb %p len %d", skb, skb->len);
			hci_send_frame(skb);

			conn->sent++;
			if (conn->sent == ~0)
				conn->sent = 0;
		}
	}
}

static void hci_tx_task(unsigned long arg)
{
	struct hci_dev *hdev = (struct hci_dev *) arg;
	struct sk_buff *skb;

	read_lock(&hci_task_lock);

	BT_DBG("%s acl %d sco %d", hdev->name, hdev->acl_cnt, hdev->sco_cnt);

	/* Schedule queues and send stuff to HCI driver */

	hci_sched_acl(hdev);

	hci_sched_sco(hdev);

	hci_sched_esco(hdev);

	/* Send next queued raw (unknown type) packet */
	while ((skb = skb_dequeue(&hdev->raw_q)))
		hci_send_frame(skb);

	read_unlock(&hci_task_lock);
}

/* ----- HCI RX task (incoming data proccessing) ----- */

/* ACL data packet */
static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_acl_hdr *hdr = (void *) skb->data;
	struct hci_conn *conn;
	__u16 handle, flags;

	skb_pull(skb, HCI_ACL_HDR_SIZE);

	handle = __le16_to_cpu(hdr->handle);
	flags  = hci_flags(handle);
	handle = hci_handle(handle);

	BT_DBG("%s len %d handle 0x%x flags 0x%x", hdev->name, skb->len, handle, flags);

	hdev->stat.acl_rx++;

	hci_dev_lock(hdev);
	conn = hci_conn_hash_lookup_handle(hdev, handle);
	hci_dev_unlock(hdev);

	if (conn) {
		register struct hci_proto *hp;

		hci_conn_enter_active_mode(conn);

		/* Send to upper protocol */
		if ((hp = hci_proto[HCI_PROTO_L2CAP]) && hp->recv_acldata) {
			hp->recv_acldata(conn, skb, flags);
			return;
		}
	} else {
		BT_ERR("%s ACL packet for unknown connection handle %d",
			hdev->name, handle);
	}

	kfree_skb(skb);
}

/* SCO data packet */
static inline void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_sco_hdr *hdr = (void *) skb->data;
	struct hci_conn *conn;
	__u16 handle;

	skb_pull(skb, HCI_SCO_HDR_SIZE);

	handle = __le16_to_cpu(hdr->handle);

	BT_DBG("%s len %d handle 0x%x", hdev->name, skb->len, handle);

	hdev->stat.sco_rx++;

	hci_dev_lock(hdev);
	conn = hci_conn_hash_lookup_handle(hdev, handle);
	hci_dev_unlock(hdev);

	if (conn) {
		register struct hci_proto *hp;

		/* Send to upper protocol */
		if ((hp = hci_proto[HCI_PROTO_SCO]) && hp->recv_scodata) {
			hp->recv_scodata(conn, skb);
			return;
		}
	} else {
		BT_ERR("%s SCO packet for unknown connection handle %d",
			hdev->name, handle);
	}

	kfree_skb(skb);
}

static void hci_rx_task(unsigned long arg)
{
	struct hci_dev *hdev = (struct hci_dev *) arg;
	struct sk_buff *skb;

	BT_DBG("%s", hdev->name);

	read_lock(&hci_task_lock);

	while ((skb = skb_dequeue(&hdev->rx_q))) {
		if (atomic_read(&hdev->promisc)) {
			/* Send copy to the sockets */
			hci_send_to_sock(hdev, skb);
		}

		if (test_bit(HCI_RAW, &hdev->flags)) {
			kfree_skb(skb);
			continue;
		}

		if (test_bit(HCI_INIT, &hdev->flags)) {
			/* Don't process data packets in this states. */
			switch (bt_cb(skb)->pkt_type) {
			case HCI_ACLDATA_PKT:
			case HCI_SCODATA_PKT:
				kfree_skb(skb);
				continue;
			}
		}

		/* Process frame */
		switch (bt_cb(skb)->pkt_type) {
		case HCI_EVENT_PKT:
			hci_event_packet(hdev, skb);
			break;

		case HCI_ACLDATA_PKT:
			BT_DBG("%s ACL data packet", hdev->name);
			hci_acldata_packet(hdev, skb);
			break;

		case HCI_SCODATA_PKT:
			BT_DBG("%s SCO data packet", hdev->name);
			hci_scodata_packet(hdev, skb);
			break;

		default:
			kfree_skb(skb);
			break;
		}
	}

	read_unlock(&hci_task_lock);
}

static void hci_cmd_task(unsigned long arg)
{
	struct hci_dev *hdev = (struct hci_dev *) arg;
	struct sk_buff *skb;

	BT_DBG("%s cmd %d", hdev->name, atomic_read(&hdev->cmd_cnt));

	if (!atomic_read(&hdev->cmd_cnt) && time_after(jiffies, hdev->cmd_last_tx + HZ)) {
		BT_ERR("%s command tx timeout", hdev->name);
		atomic_set(&hdev->cmd_cnt, 1);
	}

	/* Send queued commands */
	if (atomic_read(&hdev->cmd_cnt) && (skb = skb_dequeue(&hdev->cmd_q))) {
		kfree_skb(hdev->sent_cmd);

		if ((hdev->sent_cmd = skb_clone(skb, GFP_ATOMIC))) {
			atomic_dec(&hdev->cmd_cnt);
			hci_send_frame(skb);
			hdev->cmd_last_tx = jiffies;
		} else {
			skb_queue_head(&hdev->cmd_q, skb);
			hci_sched_cmd(hdev);
		}
	}
}