summaryrefslogtreecommitdiff
path: root/net/bluetooth/hci_request.c
blob: abc0f3224dd1910e95bb00e7692acaca844e4361 (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
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
/*
   BlueZ - Bluetooth protocol stack for Linux

   Copyright (C) 2014 Intel Corporation

   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.
*/

#include <linux/sched/signal.h>

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

#include "smp.h"
#include "hci_request.h"

#define HCI_REQ_DONE	  0
#define HCI_REQ_PEND	  1
#define HCI_REQ_CANCELED  2

void hci_req_init(struct hci_request *req, struct hci_dev *hdev)
{
	skb_queue_head_init(&req->cmd_q);
	req->hdev = hdev;
	req->err = 0;
}

void hci_req_purge(struct hci_request *req)
{
	skb_queue_purge(&req->cmd_q);
}

static int req_run(struct hci_request *req, hci_req_complete_t complete,
		   hci_req_complete_skb_t complete_skb)
{
	struct hci_dev *hdev = req->hdev;
	struct sk_buff *skb;
	unsigned long flags;

	BT_DBG("length %u", skb_queue_len(&req->cmd_q));

	/* If an error occurred during request building, remove all HCI
	 * commands queued on the HCI request queue.
	 */
	if (req->err) {
		skb_queue_purge(&req->cmd_q);
		return req->err;
	}

	/* Do not allow empty requests */
	if (skb_queue_empty(&req->cmd_q))
		return -ENODATA;

	skb = skb_peek_tail(&req->cmd_q);
	if (complete) {
		bt_cb(skb)->hci.req_complete = complete;
	} else if (complete_skb) {
		bt_cb(skb)->hci.req_complete_skb = complete_skb;
		bt_cb(skb)->hci.req_flags |= HCI_REQ_SKB;
	}

	spin_lock_irqsave(&hdev->cmd_q.lock, flags);
	skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q);
	spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);

	queue_work(hdev->workqueue, &hdev->cmd_work);

	return 0;
}

int hci_req_run(struct hci_request *req, hci_req_complete_t complete)
{
	return req_run(req, complete, NULL);
}

int hci_req_run_skb(struct hci_request *req, hci_req_complete_skb_t complete)
{
	return req_run(req, NULL, complete);
}

static void hci_req_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode,
				  struct sk_buff *skb)
{
	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;
		if (skb)
			hdev->req_skb = skb_get(skb);
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

void hci_req_sync_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);
	}
}

struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen,
				  const void *param, u8 event, u32 timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	struct hci_request req;
	struct sk_buff *skb;
	int err = 0;

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

	hci_req_init(&req, hdev);

	hci_req_add_ev(&req, opcode, plen, param, event);

	hdev->req_status = HCI_REQ_PEND;

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

	err = hci_req_run_skb(&req, hci_req_sync_complete);
	if (err < 0) {
		remove_wait_queue(&hdev->req_wait_q, &wait);
		set_current_state(TASK_RUNNING);
		return ERR_PTR(err);
	}

	schedule_timeout(timeout);

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

	if (signal_pending(current))
		return ERR_PTR(-EINTR);

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

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

	default:
		err = -ETIMEDOUT;
		break;
	}

	hdev->req_status = hdev->req_result = 0;
	skb = hdev->req_skb;
	hdev->req_skb = NULL;

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

	if (err < 0) {
		kfree_skb(skb);
		return ERR_PTR(err);
	}

	if (!skb)
		return ERR_PTR(-ENODATA);

	return skb;
}
EXPORT_SYMBOL(__hci_cmd_sync_ev);

struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
			       const void *param, u32 timeout)
{
	return __hci_cmd_sync_ev(hdev, opcode, plen, param, 0, timeout);
}
EXPORT_SYMBOL(__hci_cmd_sync);

/* Execute request and wait for completion. */
int __hci_req_sync(struct hci_dev *hdev, int (*func)(struct hci_request *req,
						     unsigned long opt),
		   unsigned long opt, u32 timeout, u8 *hci_status)
{
	struct hci_request req;
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

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

	hci_req_init(&req, hdev);

	hdev->req_status = HCI_REQ_PEND;

	err = func(&req, opt);
	if (err) {
		if (hci_status)
			*hci_status = HCI_ERROR_UNSPECIFIED;
		return err;
	}

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

	err = hci_req_run_skb(&req, hci_req_sync_complete);
	if (err < 0) {
		hdev->req_status = 0;

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

		/* ENODATA means the HCI request command queue is empty.
		 * This can happen when a request with conditionals doesn't
		 * trigger any commands to be sent. This is normal behavior
		 * and should not trigger an error return.
		 */
		if (err == -ENODATA) {
			if (hci_status)
				*hci_status = 0;
			return 0;
		}

		if (hci_status)
			*hci_status = HCI_ERROR_UNSPECIFIED;

		return err;
	}

	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_to_errno(hdev->req_result);
		if (hci_status)
			*hci_status = hdev->req_result;
		break;

	case HCI_REQ_CANCELED:
		err = -hdev->req_result;
		if (hci_status)
			*hci_status = HCI_ERROR_UNSPECIFIED;
		break;

	default:
		err = -ETIMEDOUT;
		if (hci_status)
			*hci_status = HCI_ERROR_UNSPECIFIED;
		break;
	}

	kfree_skb(hdev->req_skb);
	hdev->req_skb = NULL;
	hdev->req_status = hdev->req_result = 0;

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

	return err;
}

int hci_req_sync(struct hci_dev *hdev, int (*req)(struct hci_request *req,
						  unsigned long opt),
		 unsigned long opt, u32 timeout, u8 *hci_status)
{
	int ret;

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

	/* Serialize all requests */
	hci_req_sync_lock(hdev);
	ret = __hci_req_sync(hdev, req, opt, timeout, hci_status);
	hci_req_sync_unlock(hdev);

	return ret;
}

struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen,
				const void *param)
{
	int len = HCI_COMMAND_HDR_SIZE + plen;
	struct hci_command_hdr *hdr;
	struct sk_buff *skb;

	skb = bt_skb_alloc(len, GFP_ATOMIC);
	if (!skb)
		return NULL;

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

	if (plen)
		skb_put_data(skb, param, plen);

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

	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
	hci_skb_opcode(skb) = opcode;

	return skb;
}

/* Queue a command to an asynchronous HCI request */
void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen,
		    const void *param, u8 event)
{
	struct hci_dev *hdev = req->hdev;
	struct sk_buff *skb;

	BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen);

	/* If an error occurred during request building, there is no point in
	 * queueing the HCI command. We can simply return.
	 */
	if (req->err)
		return;

	skb = hci_prepare_cmd(hdev, opcode, plen, param);
	if (!skb) {
		bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
			   opcode);
		req->err = -ENOMEM;
		return;
	}

	if (skb_queue_empty(&req->cmd_q))
		bt_cb(skb)->hci.req_flags |= HCI_REQ_START;

	bt_cb(skb)->hci.req_event = event;

	skb_queue_tail(&req->cmd_q, skb);
}

void hci_req_add(struct hci_request *req, u16 opcode, u32 plen,
		 const void *param)
{
	hci_req_add_ev(req, opcode, plen, param, 0);
}

void __hci_req_write_fast_connectable(struct hci_request *req, bool enable)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_page_scan_activity acp;
	u8 type;

	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
		return;

	if (hdev->hci_ver < BLUETOOTH_VER_1_2)
		return;

	if (enable) {
		type = PAGE_SCAN_TYPE_INTERLACED;

		/* 160 msec page scan interval */
		acp.interval = cpu_to_le16(0x0100);
	} else {
		type = PAGE_SCAN_TYPE_STANDARD;	/* default */

		/* default 1.28 sec page scan */
		acp.interval = cpu_to_le16(0x0800);
	}

	acp.window = cpu_to_le16(0x0012);

	if (__cpu_to_le16(hdev->page_scan_interval) != acp.interval ||
	    __cpu_to_le16(hdev->page_scan_window) != acp.window)
		hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_ACTIVITY,
			    sizeof(acp), &acp);

	if (hdev->page_scan_type != type)
		hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_TYPE, 1, &type);
}

/* This function controls the background scanning based on hdev->pend_le_conns
 * list. If there are pending LE connection we start the background scanning,
 * otherwise we stop it.
 *
 * This function requires the caller holds hdev->lock.
 */
static void __hci_update_background_scan(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;

	if (!test_bit(HCI_UP, &hdev->flags) ||
	    test_bit(HCI_INIT, &hdev->flags) ||
	    hci_dev_test_flag(hdev, HCI_SETUP) ||
	    hci_dev_test_flag(hdev, HCI_CONFIG) ||
	    hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
	    hci_dev_test_flag(hdev, HCI_UNREGISTER))
		return;

	/* No point in doing scanning if LE support hasn't been enabled */
	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
		return;

	/* If discovery is active don't interfere with it */
	if (hdev->discovery.state != DISCOVERY_STOPPED)
		return;

	/* Reset RSSI and UUID filters when starting background scanning
	 * since these filters are meant for service discovery only.
	 *
	 * The Start Discovery and Start Service Discovery operations
	 * ensure to set proper values for RSSI threshold and UUID
	 * filter list. So it is safe to just reset them here.
	 */
	hci_discovery_filter_clear(hdev);

	if (list_empty(&hdev->pend_le_conns) &&
	    list_empty(&hdev->pend_le_reports)) {
		/* If there is no pending LE connections or devices
		 * to be scanned for, we should stop the background
		 * scanning.
		 */

		/* If controller is not scanning we are done. */
		if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
			return;

		hci_req_add_le_scan_disable(req);

		BT_DBG("%s stopping background scanning", hdev->name);
	} else {
		/* If there is at least one pending LE connection, we should
		 * keep the background scan running.
		 */

		/* If controller is connecting, we should not start scanning
		 * since some controllers are not able to scan and connect at
		 * the same time.
		 */
		if (hci_lookup_le_connect(hdev))
			return;

		/* If controller is currently scanning, we stop it to ensure we
		 * don't miss any advertising (due to duplicates filter).
		 */
		if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
			hci_req_add_le_scan_disable(req);

		hci_req_add_le_passive_scan(req);

		BT_DBG("%s starting background scanning", hdev->name);
	}
}

void __hci_req_update_name(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_local_name cp;

	memcpy(cp.name, hdev->dev_name, sizeof(cp.name));

	hci_req_add(req, HCI_OP_WRITE_LOCAL_NAME, sizeof(cp), &cp);
}

#define PNP_INFO_SVCLASS_ID		0x1200

static u8 *create_uuid16_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
	u8 *ptr = data, *uuids_start = NULL;
	struct bt_uuid *uuid;

	if (len < 4)
		return ptr;

	list_for_each_entry(uuid, &hdev->uuids, list) {
		u16 uuid16;

		if (uuid->size != 16)
			continue;

		uuid16 = get_unaligned_le16(&uuid->uuid[12]);
		if (uuid16 < 0x1100)
			continue;

		if (uuid16 == PNP_INFO_SVCLASS_ID)
			continue;

		if (!uuids_start) {
			uuids_start = ptr;
			uuids_start[0] = 1;
			uuids_start[1] = EIR_UUID16_ALL;
			ptr += 2;
		}

		/* Stop if not enough space to put next UUID */
		if ((ptr - data) + sizeof(u16) > len) {
			uuids_start[1] = EIR_UUID16_SOME;
			break;
		}

		*ptr++ = (uuid16 & 0x00ff);
		*ptr++ = (uuid16 & 0xff00) >> 8;
		uuids_start[0] += sizeof(uuid16);
	}

	return ptr;
}

static u8 *create_uuid32_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
	u8 *ptr = data, *uuids_start = NULL;
	struct bt_uuid *uuid;

	if (len < 6)
		return ptr;

	list_for_each_entry(uuid, &hdev->uuids, list) {
		if (uuid->size != 32)
			continue;

		if (!uuids_start) {
			uuids_start = ptr;
			uuids_start[0] = 1;
			uuids_start[1] = EIR_UUID32_ALL;
			ptr += 2;
		}

		/* Stop if not enough space to put next UUID */
		if ((ptr - data) + sizeof(u32) > len) {
			uuids_start[1] = EIR_UUID32_SOME;
			break;
		}

		memcpy(ptr, &uuid->uuid[12], sizeof(u32));
		ptr += sizeof(u32);
		uuids_start[0] += sizeof(u32);
	}

	return ptr;
}

static u8 *create_uuid128_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
	u8 *ptr = data, *uuids_start = NULL;
	struct bt_uuid *uuid;

	if (len < 18)
		return ptr;

	list_for_each_entry(uuid, &hdev->uuids, list) {
		if (uuid->size != 128)
			continue;

		if (!uuids_start) {
			uuids_start = ptr;
			uuids_start[0] = 1;
			uuids_start[1] = EIR_UUID128_ALL;
			ptr += 2;
		}

		/* Stop if not enough space to put next UUID */
		if ((ptr - data) + 16 > len) {
			uuids_start[1] = EIR_UUID128_SOME;
			break;
		}

		memcpy(ptr, uuid->uuid, 16);
		ptr += 16;
		uuids_start[0] += 16;
	}

	return ptr;
}

static void create_eir(struct hci_dev *hdev, u8 *data)
{
	u8 *ptr = data;
	size_t name_len;

	name_len = strlen(hdev->dev_name);

	if (name_len > 0) {
		/* EIR Data type */
		if (name_len > 48) {
			name_len = 48;
			ptr[1] = EIR_NAME_SHORT;
		} else
			ptr[1] = EIR_NAME_COMPLETE;

		/* EIR Data length */
		ptr[0] = name_len + 1;

		memcpy(ptr + 2, hdev->dev_name, name_len);

		ptr += (name_len + 2);
	}

	if (hdev->inq_tx_power != HCI_TX_POWER_INVALID) {
		ptr[0] = 2;
		ptr[1] = EIR_TX_POWER;
		ptr[2] = (u8) hdev->inq_tx_power;

		ptr += 3;
	}

	if (hdev->devid_source > 0) {
		ptr[0] = 9;
		ptr[1] = EIR_DEVICE_ID;

		put_unaligned_le16(hdev->devid_source, ptr + 2);
		put_unaligned_le16(hdev->devid_vendor, ptr + 4);
		put_unaligned_le16(hdev->devid_product, ptr + 6);
		put_unaligned_le16(hdev->devid_version, ptr + 8);

		ptr += 10;
	}

	ptr = create_uuid16_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
	ptr = create_uuid32_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
	ptr = create_uuid128_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
}

void __hci_req_update_eir(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_eir cp;

	if (!hdev_is_powered(hdev))
		return;

	if (!lmp_ext_inq_capable(hdev))
		return;

	if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
		return;

	if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
		return;

	memset(&cp, 0, sizeof(cp));

	create_eir(hdev, cp.data);

	if (memcmp(cp.data, hdev->eir, sizeof(cp.data)) == 0)
		return;

	memcpy(hdev->eir, cp.data, sizeof(cp.data));

	hci_req_add(req, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
}

void hci_req_add_le_scan_disable(struct hci_request *req)
{
	struct hci_cp_le_set_scan_enable cp;

	memset(&cp, 0, sizeof(cp));
	cp.enable = LE_SCAN_DISABLE;
	hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
}

static void add_to_white_list(struct hci_request *req,
			      struct hci_conn_params *params)
{
	struct hci_cp_le_add_to_white_list cp;

	cp.bdaddr_type = params->addr_type;
	bacpy(&cp.bdaddr, &params->addr);

	hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp);
}

static u8 update_white_list(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_conn_params *params;
	struct bdaddr_list *b;
	uint8_t white_list_entries = 0;

	/* Go through the current white list programmed into the
	 * controller one by one and check if that address is still
	 * in the list of pending connections or list of devices to
	 * report. If not present in either list, then queue the
	 * command to remove it from the controller.
	 */
	list_for_each_entry(b, &hdev->le_white_list, list) {
		/* If the device is neither in pend_le_conns nor
		 * pend_le_reports then remove it from the whitelist.
		 */
		if (!hci_pend_le_action_lookup(&hdev->pend_le_conns,
					       &b->bdaddr, b->bdaddr_type) &&
		    !hci_pend_le_action_lookup(&hdev->pend_le_reports,
					       &b->bdaddr, b->bdaddr_type)) {
			struct hci_cp_le_del_from_white_list cp;

			cp.bdaddr_type = b->bdaddr_type;
			bacpy(&cp.bdaddr, &b->bdaddr);

			hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST,
				    sizeof(cp), &cp);
			continue;
		}

		if (hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
			/* White list can not be used with RPAs */
			return 0x00;
		}

		white_list_entries++;
	}

	/* Since all no longer valid white list entries have been
	 * removed, walk through the list of pending connections
	 * and ensure that any new device gets programmed into
	 * the controller.
	 *
	 * If the list of the devices is larger than the list of
	 * available white list entries in the controller, then
	 * just abort and return filer policy value to not use the
	 * white list.
	 */
	list_for_each_entry(params, &hdev->pend_le_conns, action) {
		if (hci_bdaddr_list_lookup(&hdev->le_white_list,
					   &params->addr, params->addr_type))
			continue;

		if (white_list_entries >= hdev->le_white_list_size) {
			/* Select filter policy to accept all advertising */
			return 0x00;
		}

		if (hci_find_irk_by_addr(hdev, &params->addr,
					 params->addr_type)) {
			/* White list can not be used with RPAs */
			return 0x00;
		}

		white_list_entries++;
		add_to_white_list(req, params);
	}

	/* After adding all new pending connections, walk through
	 * the list of pending reports and also add these to the
	 * white list if there is still space.
	 */
	list_for_each_entry(params, &hdev->pend_le_reports, action) {
		if (hci_bdaddr_list_lookup(&hdev->le_white_list,
					   &params->addr, params->addr_type))
			continue;

		if (white_list_entries >= hdev->le_white_list_size) {
			/* Select filter policy to accept all advertising */
			return 0x00;
		}

		if (hci_find_irk_by_addr(hdev, &params->addr,
					 params->addr_type)) {
			/* White list can not be used with RPAs */
			return 0x00;
		}

		white_list_entries++;
		add_to_white_list(req, params);
	}

	/* Select filter policy to use white list */
	return 0x01;
}

static bool scan_use_rpa(struct hci_dev *hdev)
{
	return hci_dev_test_flag(hdev, HCI_PRIVACY);
}

void hci_req_add_le_passive_scan(struct hci_request *req)
{
	struct hci_cp_le_set_scan_param param_cp;
	struct hci_cp_le_set_scan_enable enable_cp;
	struct hci_dev *hdev = req->hdev;
	u8 own_addr_type;
	u8 filter_policy;

	/* Set require_privacy to false since no SCAN_REQ are send
	 * during passive scanning. Not using an non-resolvable address
	 * here is important so that peer devices using direct
	 * advertising with our address will be correctly reported
	 * by the controller.
	 */
	if (hci_update_random_address(req, false, scan_use_rpa(hdev),
				      &own_addr_type))
		return;

	/* Adding or removing entries from the white list must
	 * happen before enabling scanning. The controller does
	 * not allow white list modification while scanning.
	 */
	filter_policy = update_white_list(req);

	/* When the controller is using random resolvable addresses and
	 * with that having LE privacy enabled, then controllers with
	 * Extended Scanner Filter Policies support can now enable support
	 * for handling directed advertising.
	 *
	 * So instead of using filter polices 0x00 (no whitelist)
	 * and 0x01 (whitelist enabled) use the new filter policies
	 * 0x02 (no whitelist) and 0x03 (whitelist enabled).
	 */
	if (hci_dev_test_flag(hdev, HCI_PRIVACY) &&
	    (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY))
		filter_policy |= 0x02;

	memset(&param_cp, 0, sizeof(param_cp));
	param_cp.type = LE_SCAN_PASSIVE;
	param_cp.interval = cpu_to_le16(hdev->le_scan_interval);
	param_cp.window = cpu_to_le16(hdev->le_scan_window);
	param_cp.own_address_type = own_addr_type;
	param_cp.filter_policy = filter_policy;
	hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp),
		    &param_cp);

	memset(&enable_cp, 0, sizeof(enable_cp));
	enable_cp.enable = LE_SCAN_ENABLE;
	enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
	hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
		    &enable_cp);
}

static u8 get_cur_adv_instance_scan_rsp_len(struct hci_dev *hdev)
{
	u8 instance = hdev->cur_adv_instance;
	struct adv_info *adv_instance;

	/* Ignore instance 0 */
	if (instance == 0x00)
		return 0;

	adv_instance = hci_find_adv_instance(hdev, instance);
	if (!adv_instance)
		return 0;

	/* TODO: Take into account the "appearance" and "local-name" flags here.
	 * These are currently being ignored as they are not supported.
	 */
	return adv_instance->scan_rsp_len;
}

void __hci_req_disable_advertising(struct hci_request *req)
{
	u8 enable = 0x00;

	hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}

static u32 get_adv_instance_flags(struct hci_dev *hdev, u8 instance)
{
	u32 flags;
	struct adv_info *adv_instance;

	if (instance == 0x00) {
		/* Instance 0 always manages the "Tx Power" and "Flags"
		 * fields
		 */
		flags = MGMT_ADV_FLAG_TX_POWER | MGMT_ADV_FLAG_MANAGED_FLAGS;

		/* For instance 0, the HCI_ADVERTISING_CONNECTABLE setting
		 * corresponds to the "connectable" instance flag.
		 */
		if (hci_dev_test_flag(hdev, HCI_ADVERTISING_CONNECTABLE))
			flags |= MGMT_ADV_FLAG_CONNECTABLE;

		if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
			flags |= MGMT_ADV_FLAG_LIMITED_DISCOV;
		else if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
			flags |= MGMT_ADV_FLAG_DISCOV;

		return flags;
	}

	adv_instance = hci_find_adv_instance(hdev, instance);

	/* Return 0 when we got an invalid instance identifier. */
	if (!adv_instance)
		return 0;

	return adv_instance->flags;
}

static bool adv_use_rpa(struct hci_dev *hdev, uint32_t flags)
{
	/* If privacy is not enabled don't use RPA */
	if (!hci_dev_test_flag(hdev, HCI_PRIVACY))
		return false;

	/* If basic privacy mode is enabled use RPA */
	if (!hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY))
		return true;

	/* If limited privacy mode is enabled don't use RPA if we're
	 * both discoverable and bondable.
	 */
	if ((flags & MGMT_ADV_FLAG_DISCOV) &&
	    hci_dev_test_flag(hdev, HCI_BONDABLE))
		return false;

	/* We're neither bondable nor discoverable in the limited
	 * privacy mode, therefore use RPA.
	 */
	return true;
}

void __hci_req_enable_advertising(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_adv_param cp;
	u8 own_addr_type, enable = 0x01;
	bool connectable;
	u32 flags;

	if (hci_conn_num(hdev, LE_LINK) > 0)
		return;

	if (hci_dev_test_flag(hdev, HCI_LE_ADV))
		__hci_req_disable_advertising(req);

	/* Clear the HCI_LE_ADV bit temporarily so that the
	 * hci_update_random_address knows that it's safe to go ahead
	 * and write a new random address. The flag will be set back on
	 * as soon as the SET_ADV_ENABLE HCI command completes.
	 */
	hci_dev_clear_flag(hdev, HCI_LE_ADV);

	flags = get_adv_instance_flags(hdev, hdev->cur_adv_instance);

	/* If the "connectable" instance flag was not set, then choose between
	 * ADV_IND and ADV_NONCONN_IND based on the global connectable setting.
	 */
	connectable = (flags & MGMT_ADV_FLAG_CONNECTABLE) ||
		      mgmt_get_connectable(hdev);

	/* Set require_privacy to true only when non-connectable
	 * advertising is used. In that case it is fine to use a
	 * non-resolvable private address.
	 */
	if (hci_update_random_address(req, !connectable,
				      adv_use_rpa(hdev, flags),
				      &own_addr_type) < 0)
		return;

	memset(&cp, 0, sizeof(cp));
	cp.min_interval = cpu_to_le16(hdev->le_adv_min_interval);
	cp.max_interval = cpu_to_le16(hdev->le_adv_max_interval);

	if (connectable)
		cp.type = LE_ADV_IND;
	else if (get_cur_adv_instance_scan_rsp_len(hdev))
		cp.type = LE_ADV_SCAN_IND;
	else
		cp.type = LE_ADV_NONCONN_IND;

	cp.own_address_type = own_addr_type;
	cp.channel_map = hdev->le_adv_channel_map;

	hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);

	hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}

u8 append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
	size_t short_len;
	size_t complete_len;

	/* no space left for name (+ NULL + type + len) */
	if ((HCI_MAX_AD_LENGTH - ad_len) < HCI_MAX_SHORT_NAME_LENGTH + 3)
		return ad_len;

	/* use complete name if present and fits */
	complete_len = strlen(hdev->dev_name);
	if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH)
		return eir_append_data(ptr, ad_len, EIR_NAME_COMPLETE,
				       hdev->dev_name, complete_len + 1);

	/* use short name if present */
	short_len = strlen(hdev->short_name);
	if (short_len)
		return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
				       hdev->short_name, short_len + 1);

	/* use shortened full name if present, we already know that name
	 * is longer then HCI_MAX_SHORT_NAME_LENGTH
	 */
	if (complete_len) {
		u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];

		memcpy(name, hdev->dev_name, HCI_MAX_SHORT_NAME_LENGTH);
		name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';

		return eir_append_data(ptr, ad_len, EIR_NAME_SHORT, name,
				       sizeof(name));
	}

	return ad_len;
}

static u8 append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
	return eir_append_le16(ptr, ad_len, EIR_APPEARANCE, hdev->appearance);
}

static u8 create_default_scan_rsp_data(struct hci_dev *hdev, u8 *ptr)
{
	u8 scan_rsp_len = 0;

	if (hdev->appearance) {
		scan_rsp_len = append_appearance(hdev, ptr, scan_rsp_len);
	}

	return append_local_name(hdev, ptr, scan_rsp_len);
}

static u8 create_instance_scan_rsp_data(struct hci_dev *hdev, u8 instance,
					u8 *ptr)
{
	struct adv_info *adv_instance;
	u32 instance_flags;
	u8 scan_rsp_len = 0;

	adv_instance = hci_find_adv_instance(hdev, instance);
	if (!adv_instance)
		return 0;

	instance_flags = adv_instance->flags;

	if ((instance_flags & MGMT_ADV_FLAG_APPEARANCE) && hdev->appearance) {
		scan_rsp_len = append_appearance(hdev, ptr, scan_rsp_len);
	}

	memcpy(&ptr[scan_rsp_len], adv_instance->scan_rsp_data,
	       adv_instance->scan_rsp_len);

	scan_rsp_len += adv_instance->scan_rsp_len;

	if (instance_flags & MGMT_ADV_FLAG_LOCAL_NAME)
		scan_rsp_len = append_local_name(hdev, ptr, scan_rsp_len);

	return scan_rsp_len;
}

void __hci_req_update_scan_rsp_data(struct hci_request *req, u8 instance)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_scan_rsp_data cp;
	u8 len;

	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
		return;

	memset(&cp, 0, sizeof(cp));

	if (instance)
		len = create_instance_scan_rsp_data(hdev, instance, cp.data);
	else
		len = create_default_scan_rsp_data(hdev, cp.data);

	if (hdev->scan_rsp_data_len == len &&
	    !memcmp(cp.data, hdev->scan_rsp_data, len))
		return;

	memcpy(hdev->scan_rsp_data, cp.data, sizeof(cp.data));
	hdev->scan_rsp_data_len = len;

	cp.length = len;

	hci_req_add(req, HCI_OP_LE_SET_SCAN_RSP_DATA, sizeof(cp), &cp);
}

static u8 create_instance_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
{
	struct adv_info *adv_instance = NULL;
	u8 ad_len = 0, flags = 0;
	u32 instance_flags;

	/* Return 0 when the current instance identifier is invalid. */
	if (instance) {
		adv_instance = hci_find_adv_instance(hdev, instance);
		if (!adv_instance)
			return 0;
	}

	instance_flags = get_adv_instance_flags(hdev, instance);

	/* The Add Advertising command allows userspace to set both the general
	 * and limited discoverable flags.
	 */
	if (instance_flags & MGMT_ADV_FLAG_DISCOV)
		flags |= LE_AD_GENERAL;

	if (instance_flags & MGMT_ADV_FLAG_LIMITED_DISCOV)
		flags |= LE_AD_LIMITED;

	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
		flags |= LE_AD_NO_BREDR;

	if (flags || (instance_flags & MGMT_ADV_FLAG_MANAGED_FLAGS)) {
		/* If a discovery flag wasn't provided, simply use the global
		 * settings.
		 */
		if (!flags)
			flags |= mgmt_get_adv_discov_flags(hdev);

		/* If flags would still be empty, then there is no need to
		 * include the "Flags" AD field".
		 */
		if (flags) {
			ptr[0] = 0x02;
			ptr[1] = EIR_FLAGS;
			ptr[2] = flags;

			ad_len += 3;
			ptr += 3;
		}
	}

	if (adv_instance) {
		memcpy(ptr, adv_instance->adv_data,
		       adv_instance->adv_data_len);
		ad_len += adv_instance->adv_data_len;
		ptr += adv_instance->adv_data_len;
	}

	/* Provide Tx Power only if we can provide a valid value for it */
	if (hdev->adv_tx_power != HCI_TX_POWER_INVALID &&
	    (instance_flags & MGMT_ADV_FLAG_TX_POWER)) {
		ptr[0] = 0x02;
		ptr[1] = EIR_TX_POWER;
		ptr[2] = (u8)hdev->adv_tx_power;

		ad_len += 3;
		ptr += 3;
	}

	return ad_len;
}

void __hci_req_update_adv_data(struct hci_request *req, u8 instance)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_adv_data cp;
	u8 len;

	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
		return;

	memset(&cp, 0, sizeof(cp));

	len = create_instance_adv_data(hdev, instance, cp.data);

	/* There's nothing to do if the data hasn't changed */
	if (hdev->adv_data_len == len &&
	    memcmp(cp.data, hdev->adv_data, len) == 0)
		return;

	memcpy(hdev->adv_data, cp.data, sizeof(cp.data));
	hdev->adv_data_len = len;

	cp.length = len;

	hci_req_add(req, HCI_OP_LE_SET_ADV_DATA, sizeof(cp), &cp);
}

int hci_req_update_adv_data(struct hci_dev *hdev, u8 instance)
{
	struct hci_request req;

	hci_req_init(&req, hdev);
	__hci_req_update_adv_data(&req, instance);

	return hci_req_run(&req, NULL);
}

static void adv_enable_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
	BT_DBG("%s status %u", hdev->name, status);
}

void hci_req_reenable_advertising(struct hci_dev *hdev)
{
	struct hci_request req;

	if (!hci_dev_test_flag(hdev, HCI_ADVERTISING) &&
	    list_empty(&hdev->adv_instances))
		return;

	hci_req_init(&req, hdev);

	if (hdev->cur_adv_instance) {
		__hci_req_schedule_adv_instance(&req, hdev->cur_adv_instance,
						true);
	} else {
		__hci_req_update_adv_data(&req, 0x00);
		__hci_req_update_scan_rsp_data(&req, 0x00);
		__hci_req_enable_advertising(&req);
	}

	hci_req_run(&req, adv_enable_complete);
}

static void adv_timeout_expire(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    adv_instance_expire.work);

	struct hci_request req;
	u8 instance;

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

	hci_dev_lock(hdev);

	hdev->adv_instance_timeout = 0;

	instance = hdev->cur_adv_instance;
	if (instance == 0x00)
		goto unlock;

	hci_req_init(&req, hdev);

	hci_req_clear_adv_instance(hdev, NULL, &req, instance, false);

	if (list_empty(&hdev->adv_instances))
		__hci_req_disable_advertising(&req);

	hci_req_run(&req, NULL);

unlock:
	hci_dev_unlock(hdev);
}

int __hci_req_schedule_adv_instance(struct hci_request *req, u8 instance,
				    bool force)
{
	struct hci_dev *hdev = req->hdev;
	struct adv_info *adv_instance = NULL;
	u16 timeout;

	if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
	    list_empty(&hdev->adv_instances))
		return -EPERM;

	if (hdev->adv_instance_timeout)
		return -EBUSY;

	adv_instance = hci_find_adv_instance(hdev, instance);
	if (!adv_instance)
		return -ENOENT;

	/* A zero timeout means unlimited advertising. As long as there is
	 * only one instance, duration should be ignored. We still set a timeout
	 * in case further instances are being added later on.
	 *
	 * If the remaining lifetime of the instance is more than the duration
	 * then the timeout corresponds to the duration, otherwise it will be
	 * reduced to the remaining instance lifetime.
	 */
	if (adv_instance->timeout == 0 ||
	    adv_instance->duration <= adv_instance->remaining_time)
		timeout = adv_instance->duration;
	else
		timeout = adv_instance->remaining_time;

	/* The remaining time is being reduced unless the instance is being
	 * advertised without time limit.
	 */
	if (adv_instance->timeout)
		adv_instance->remaining_time =
				adv_instance->remaining_time - timeout;

	hdev->adv_instance_timeout = timeout;
	queue_delayed_work(hdev->req_workqueue,
			   &hdev->adv_instance_expire,
			   msecs_to_jiffies(timeout * 1000));

	/* If we're just re-scheduling the same instance again then do not
	 * execute any HCI commands. This happens when a single instance is
	 * being advertised.
	 */
	if (!force && hdev->cur_adv_instance == instance &&
	    hci_dev_test_flag(hdev, HCI_LE_ADV))
		return 0;

	hdev->cur_adv_instance = instance;
	__hci_req_update_adv_data(req, instance);
	__hci_req_update_scan_rsp_data(req, instance);
	__hci_req_enable_advertising(req);

	return 0;
}

static void cancel_adv_timeout(struct hci_dev *hdev)
{
	if (hdev->adv_instance_timeout) {
		hdev->adv_instance_timeout = 0;
		cancel_delayed_work(&hdev->adv_instance_expire);
	}
}

/* For a single instance:
 * - force == true: The instance will be removed even when its remaining
 *   lifetime is not zero.
 * - force == false: the instance will be deactivated but kept stored unless
 *   the remaining lifetime is zero.
 *
 * For instance == 0x00:
 * - force == true: All instances will be removed regardless of their timeout
 *   setting.
 * - force == false: Only instances that have a timeout will be removed.
 */
void hci_req_clear_adv_instance(struct hci_dev *hdev, struct sock *sk,
				struct hci_request *req, u8 instance,
				bool force)
{
	struct adv_info *adv_instance, *n, *next_instance = NULL;
	int err;
	u8 rem_inst;

	/* Cancel any timeout concerning the removed instance(s). */
	if (!instance || hdev->cur_adv_instance == instance)
		cancel_adv_timeout(hdev);

	/* Get the next instance to advertise BEFORE we remove
	 * the current one. This can be the same instance again
	 * if there is only one instance.
	 */
	if (instance && hdev->cur_adv_instance == instance)
		next_instance = hci_get_next_instance(hdev, instance);

	if (instance == 0x00) {
		list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances,
					 list) {
			if (!(force || adv_instance->timeout))
				continue;

			rem_inst = adv_instance->instance;
			err = hci_remove_adv_instance(hdev, rem_inst);
			if (!err)
				mgmt_advertising_removed(sk, hdev, rem_inst);
		}
	} else {
		adv_instance = hci_find_adv_instance(hdev, instance);

		if (force || (adv_instance && adv_instance->timeout &&
			      !adv_instance->remaining_time)) {
			/* Don't advertise a removed instance. */
			if (next_instance &&
			    next_instance->instance == instance)
				next_instance = NULL;

			err = hci_remove_adv_instance(hdev, instance);
			if (!err)
				mgmt_advertising_removed(sk, hdev, instance);
		}
	}

	if (!req || !hdev_is_powered(hdev) ||
	    hci_dev_test_flag(hdev, HCI_ADVERTISING))
		return;

	if (next_instance)
		__hci_req_schedule_adv_instance(req, next_instance->instance,
						false);
}

static void set_random_addr(struct hci_request *req, bdaddr_t *rpa)
{
	struct hci_dev *hdev = req->hdev;

	/* If we're advertising or initiating an LE connection we can't
	 * go ahead and change the random address at this time. This is
	 * because the eventual initiator address used for the
	 * subsequently created connection will be undefined (some
	 * controllers use the new address and others the one we had
	 * when the operation started).
	 *
	 * In this kind of scenario skip the update and let the random
	 * address be updated at the next cycle.
	 */
	if (hci_dev_test_flag(hdev, HCI_LE_ADV) ||
	    hci_lookup_le_connect(hdev)) {
		BT_DBG("Deferring random address update");
		hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
		return;
	}

	hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, rpa);
}

int hci_update_random_address(struct hci_request *req, bool require_privacy,
			      bool use_rpa, u8 *own_addr_type)
{
	struct hci_dev *hdev = req->hdev;
	int err;

	/* If privacy is enabled use a resolvable private address. If
	 * current RPA has expired or there is something else than
	 * the current RPA in use, then generate a new one.
	 */
	if (use_rpa) {
		int to;

		*own_addr_type = ADDR_LE_DEV_RANDOM;

		if (!hci_dev_test_and_clear_flag(hdev, HCI_RPA_EXPIRED) &&
		    !bacmp(&hdev->random_addr, &hdev->rpa))
			return 0;

		err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
		if (err < 0) {
			bt_dev_err(hdev, "failed to generate new RPA");
			return err;
		}

		set_random_addr(req, &hdev->rpa);

		to = msecs_to_jiffies(hdev->rpa_timeout * 1000);
		queue_delayed_work(hdev->workqueue, &hdev->rpa_expired, to);

		return 0;
	}

	/* In case of required privacy without resolvable private address,
	 * use an non-resolvable private address. This is useful for active
	 * scanning and non-connectable advertising.
	 */
	if (require_privacy) {
		bdaddr_t nrpa;

		while (true) {
			/* The non-resolvable private address is generated
			 * from random six bytes with the two most significant
			 * bits cleared.
			 */
			get_random_bytes(&nrpa, 6);
			nrpa.b[5] &= 0x3f;

			/* The non-resolvable private address shall not be
			 * equal to the public address.
			 */
			if (bacmp(&hdev->bdaddr, &nrpa))
				break;
		}

		*own_addr_type = ADDR_LE_DEV_RANDOM;
		set_random_addr(req, &nrpa);
		return 0;
	}

	/* If forcing static address is in use or there is no public
	 * address use the static address as random address (but skip
	 * the HCI command if the current random address is already the
	 * static one.
	 *
	 * In case BR/EDR has been disabled on a dual-mode controller
	 * and a static address has been configured, then use that
	 * address instead of the public BR/EDR address.
	 */
	if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
	    !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
	    (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
	     bacmp(&hdev->static_addr, BDADDR_ANY))) {
		*own_addr_type = ADDR_LE_DEV_RANDOM;
		if (bacmp(&hdev->static_addr, &hdev->random_addr))
			hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
				    &hdev->static_addr);
		return 0;
	}

	/* Neither privacy nor static address is being used so use a
	 * public address.
	 */
	*own_addr_type = ADDR_LE_DEV_PUBLIC;

	return 0;
}

static bool disconnected_whitelist_entries(struct hci_dev *hdev)
{
	struct bdaddr_list *b;

	list_for_each_entry(b, &hdev->whitelist, list) {
		struct hci_conn *conn;

		conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr);
		if (!conn)
			return true;

		if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
			return true;
	}

	return false;
}

void __hci_req_update_scan(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	u8 scan;

	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
		return;

	if (!hdev_is_powered(hdev))
		return;

	if (mgmt_powering_down(hdev))
		return;

	if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) ||
	    disconnected_whitelist_entries(hdev))
		scan = SCAN_PAGE;
	else
		scan = SCAN_DISABLED;

	if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
		scan |= SCAN_INQUIRY;

	if (test_bit(HCI_PSCAN, &hdev->flags) == !!(scan & SCAN_PAGE) &&
	    test_bit(HCI_ISCAN, &hdev->flags) == !!(scan & SCAN_INQUIRY))
		return;

	hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
}

static int update_scan(struct hci_request *req, unsigned long opt)
{
	hci_dev_lock(req->hdev);
	__hci_req_update_scan(req);
	hci_dev_unlock(req->hdev);
	return 0;
}

static void scan_update_work(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev, scan_update);

	hci_req_sync(hdev, update_scan, 0, HCI_CMD_TIMEOUT, NULL);
}

static int connectable_update(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

	hci_dev_lock(hdev);

	__hci_req_update_scan(req);

	/* If BR/EDR is not enabled and we disable advertising as a
	 * by-product of disabling connectable, we need to update the
	 * advertising flags.
	 */
	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
		__hci_req_update_adv_data(req, hdev->cur_adv_instance);

	/* Update the advertising parameters if necessary */
	if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
	    !list_empty(&hdev->adv_instances))
		__hci_req_enable_advertising(req);

	__hci_update_background_scan(req);

	hci_dev_unlock(hdev);

	return 0;
}

static void connectable_update_work(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    connectable_update);
	u8 status;

	hci_req_sync(hdev, connectable_update, 0, HCI_CMD_TIMEOUT, &status);
	mgmt_set_connectable_complete(hdev, status);
}

static u8 get_service_classes(struct hci_dev *hdev)
{
	struct bt_uuid *uuid;
	u8 val = 0;

	list_for_each_entry(uuid, &hdev->uuids, list)
		val |= uuid->svc_hint;

	return val;
}

void __hci_req_update_class(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	u8 cod[3];

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

	if (!hdev_is_powered(hdev))
		return;

	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
		return;

	if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
		return;

	cod[0] = hdev->minor_class;
	cod[1] = hdev->major_class;
	cod[2] = get_service_classes(hdev);

	if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
		cod[1] |= 0x20;

	if (memcmp(cod, hdev->dev_class, 3) == 0)
		return;

	hci_req_add(req, HCI_OP_WRITE_CLASS_OF_DEV, sizeof(cod), cod);
}

static void write_iac(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_current_iac_lap cp;

	if (!hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
		return;

	if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE)) {
		/* Limited discoverable mode */
		cp.num_iac = min_t(u8, hdev->num_iac, 2);
		cp.iac_lap[0] = 0x00;	/* LIAC */
		cp.iac_lap[1] = 0x8b;
		cp.iac_lap[2] = 0x9e;
		cp.iac_lap[3] = 0x33;	/* GIAC */
		cp.iac_lap[4] = 0x8b;
		cp.iac_lap[5] = 0x9e;
	} else {
		/* General discoverable mode */
		cp.num_iac = 1;
		cp.iac_lap[0] = 0x33;	/* GIAC */
		cp.iac_lap[1] = 0x8b;
		cp.iac_lap[2] = 0x9e;
	}

	hci_req_add(req, HCI_OP_WRITE_CURRENT_IAC_LAP,
		    (cp.num_iac * 3) + 1, &cp);
}

static int discoverable_update(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

	hci_dev_lock(hdev);

	if (hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
		write_iac(req);
		__hci_req_update_scan(req);
		__hci_req_update_class(req);
	}

	/* Advertising instances don't use the global discoverable setting, so
	 * only update AD if advertising was enabled using Set Advertising.
	 */
	if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) {
		__hci_req_update_adv_data(req, 0x00);

		/* Discoverable mode affects the local advertising
		 * address in limited privacy mode.
		 */
		if (hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY))
			__hci_req_enable_advertising(req);
	}

	hci_dev_unlock(hdev);

	return 0;
}

static void discoverable_update_work(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    discoverable_update);
	u8 status;

	hci_req_sync(hdev, discoverable_update, 0, HCI_CMD_TIMEOUT, &status);
	mgmt_set_discoverable_complete(hdev, status);
}

void __hci_abort_conn(struct hci_request *req, struct hci_conn *conn,
		      u8 reason)
{
	switch (conn->state) {
	case BT_CONNECTED:
	case BT_CONFIG:
		if (conn->type == AMP_LINK) {
			struct hci_cp_disconn_phy_link cp;

			cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
			cp.reason = reason;
			hci_req_add(req, HCI_OP_DISCONN_PHY_LINK, sizeof(cp),
				    &cp);
		} else {
			struct hci_cp_disconnect dc;

			dc.handle = cpu_to_le16(conn->handle);
			dc.reason = reason;
			hci_req_add(req, HCI_OP_DISCONNECT, sizeof(dc), &dc);
		}

		conn->state = BT_DISCONN;

		break;
	case BT_CONNECT:
		if (conn->type == LE_LINK) {
			if (test_bit(HCI_CONN_SCANNING, &conn->flags))
				break;
			hci_req_add(req, HCI_OP_LE_CREATE_CONN_CANCEL,
				    0, NULL);
		} else if (conn->type == ACL_LINK) {
			if (req->hdev->hci_ver < BLUETOOTH_VER_1_2)
				break;
			hci_req_add(req, HCI_OP_CREATE_CONN_CANCEL,
				    6, &conn->dst);
		}
		break;
	case BT_CONNECT2:
		if (conn->type == ACL_LINK) {
			struct hci_cp_reject_conn_req rej;

			bacpy(&rej.bdaddr, &conn->dst);
			rej.reason = reason;

			hci_req_add(req, HCI_OP_REJECT_CONN_REQ,
				    sizeof(rej), &rej);
		} else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
			struct hci_cp_reject_sync_conn_req rej;

			bacpy(&rej.bdaddr, &conn->dst);

			/* SCO rejection has its own limited set of
			 * allowed error values (0x0D-0x0F) which isn't
			 * compatible with most values passed to this
			 * function. To be safe hard-code one of the
			 * values that's suitable for SCO.
			 */
			rej.reason = HCI_ERROR_REJ_LIMITED_RESOURCES;

			hci_req_add(req, HCI_OP_REJECT_SYNC_CONN_REQ,
				    sizeof(rej), &rej);
		}
		break;
	default:
		conn->state = BT_CLOSED;
		break;
	}
}

static void abort_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
	if (status)
		BT_DBG("Failed to abort connection: status 0x%2.2x", status);
}

int hci_abort_conn(struct hci_conn *conn, u8 reason)
{
	struct hci_request req;
	int err;

	hci_req_init(&req, conn->hdev);

	__hci_abort_conn(&req, conn, reason);

	err = hci_req_run(&req, abort_conn_complete);
	if (err && err != -ENODATA) {
		bt_dev_err(conn->hdev, "failed to run HCI request: err %d", err);
		return err;
	}

	return 0;
}

static int update_bg_scan(struct hci_request *req, unsigned long opt)
{
	hci_dev_lock(req->hdev);
	__hci_update_background_scan(req);
	hci_dev_unlock(req->hdev);
	return 0;
}

static void bg_scan_update(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    bg_scan_update);
	struct hci_conn *conn;
	u8 status;
	int err;

	err = hci_req_sync(hdev, update_bg_scan, 0, HCI_CMD_TIMEOUT, &status);
	if (!err)
		return;

	hci_dev_lock(hdev);

	conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
	if (conn)
		hci_le_conn_failed(conn, status);

	hci_dev_unlock(hdev);
}

static int le_scan_disable(struct hci_request *req, unsigned long opt)
{
	hci_req_add_le_scan_disable(req);
	return 0;
}

static int bredr_inquiry(struct hci_request *req, unsigned long opt)
{
	u8 length = opt;
	const u8 giac[3] = { 0x33, 0x8b, 0x9e };
	const u8 liac[3] = { 0x00, 0x8b, 0x9e };
	struct hci_cp_inquiry cp;

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

	hci_dev_lock(req->hdev);
	hci_inquiry_cache_flush(req->hdev);
	hci_dev_unlock(req->hdev);

	memset(&cp, 0, sizeof(cp));

	if (req->hdev->discovery.limited)
		memcpy(&cp.lap, liac, sizeof(cp.lap));
	else
		memcpy(&cp.lap, giac, sizeof(cp.lap));

	cp.length = length;

	hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp);

	return 0;
}

static void le_scan_disable_work(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    le_scan_disable.work);
	u8 status;

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

	if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
		return;

	cancel_delayed_work(&hdev->le_scan_restart);

	hci_req_sync(hdev, le_scan_disable, 0, HCI_CMD_TIMEOUT, &status);
	if (status) {
		bt_dev_err(hdev, "failed to disable LE scan: status 0x%02x",
			   status);
		return;
	}

	hdev->discovery.scan_start = 0;

	/* If we were running LE only scan, change discovery state. If
	 * we were running both LE and BR/EDR inquiry simultaneously,
	 * and BR/EDR inquiry is already finished, stop discovery,
	 * otherwise BR/EDR inquiry will stop discovery when finished.
	 * If we will resolve remote device name, do not change
	 * discovery state.
	 */

	if (hdev->discovery.type == DISCOV_TYPE_LE)
		goto discov_stopped;

	if (hdev->discovery.type != DISCOV_TYPE_INTERLEAVED)
		return;

	if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks)) {
		if (!test_bit(HCI_INQUIRY, &hdev->flags) &&
		    hdev->discovery.state != DISCOVERY_RESOLVING)
			goto discov_stopped;

		return;
	}

	hci_req_sync(hdev, bredr_inquiry, DISCOV_INTERLEAVED_INQUIRY_LEN,
		     HCI_CMD_TIMEOUT, &status);
	if (status) {
		bt_dev_err(hdev, "inquiry failed: status 0x%02x", status);
		goto discov_stopped;
	}

	return;

discov_stopped:
	hci_dev_lock(hdev);
	hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
	hci_dev_unlock(hdev);
}

static int le_scan_restart(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_scan_enable cp;

	/* If controller is not scanning we are done. */
	if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
		return 0;

	hci_req_add_le_scan_disable(req);

	memset(&cp, 0, sizeof(cp));
	cp.enable = LE_SCAN_ENABLE;
	cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
	hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);

	return 0;
}

static void le_scan_restart_work(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    le_scan_restart.work);
	unsigned long timeout, duration, scan_start, now;
	u8 status;

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

	hci_req_sync(hdev, le_scan_restart, 0, HCI_CMD_TIMEOUT, &status);
	if (status) {
		bt_dev_err(hdev, "failed to restart LE scan: status %d",
			   status);
		return;
	}

	hci_dev_lock(hdev);

	if (!test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) ||
	    !hdev->discovery.scan_start)
		goto unlock;

	/* When the scan was started, hdev->le_scan_disable has been queued
	 * after duration from scan_start. During scan restart this job
	 * has been canceled, and we need to queue it again after proper
	 * timeout, to make sure that scan does not run indefinitely.
	 */
	duration = hdev->discovery.scan_duration;
	scan_start = hdev->discovery.scan_start;
	now = jiffies;
	if (now - scan_start <= duration) {
		int elapsed;

		if (now >= scan_start)
			elapsed = now - scan_start;
		else
			elapsed = ULONG_MAX - scan_start + now;

		timeout = duration - elapsed;
	} else {
		timeout = 0;
	}

	queue_delayed_work(hdev->req_workqueue,
			   &hdev->le_scan_disable, timeout);

unlock:
	hci_dev_unlock(hdev);
}

static void disable_advertising(struct hci_request *req)
{
	u8 enable = 0x00;

	hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}

static int active_scan(struct hci_request *req, unsigned long opt)
{
	uint16_t interval = opt;
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_scan_param param_cp;
	struct hci_cp_le_set_scan_enable enable_cp;
	u8 own_addr_type;
	int err;

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

	if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
		hci_dev_lock(hdev);

		/* Don't let discovery abort an outgoing connection attempt
		 * that's using directed advertising.
		 */
		if (hci_lookup_le_connect(hdev)) {
			hci_dev_unlock(hdev);
			return -EBUSY;
		}

		cancel_adv_timeout(hdev);
		hci_dev_unlock(hdev);

		disable_advertising(req);
	}

	/* If controller is scanning, it means the background scanning is
	 * running. Thus, we should temporarily stop it in order to set the
	 * discovery scanning parameters.
	 */
	if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
		hci_req_add_le_scan_disable(req);

	/* All active scans will be done with either a resolvable private
	 * address (when privacy feature has been enabled) or non-resolvable
	 * private address.
	 */
	err = hci_update_random_address(req, true, scan_use_rpa(hdev),
					&own_addr_type);
	if (err < 0)
		own_addr_type = ADDR_LE_DEV_PUBLIC;

	memset(&param_cp, 0, sizeof(param_cp));
	param_cp.type = LE_SCAN_ACTIVE;
	param_cp.interval = cpu_to_le16(interval);
	param_cp.window = cpu_to_le16(DISCOV_LE_SCAN_WIN);
	param_cp.own_address_type = own_addr_type;

	hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp),
		    &param_cp);

	memset(&enable_cp, 0, sizeof(enable_cp));
	enable_cp.enable = LE_SCAN_ENABLE;
	enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;

	hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
		    &enable_cp);

	return 0;
}

static int interleaved_discov(struct hci_request *req, unsigned long opt)
{
	int err;

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

	err = active_scan(req, opt);
	if (err)
		return err;

	return bredr_inquiry(req, DISCOV_BREDR_INQUIRY_LEN);
}

static void start_discovery(struct hci_dev *hdev, u8 *status)
{
	unsigned long timeout;

	BT_DBG("%s type %u", hdev->name, hdev->discovery.type);

	switch (hdev->discovery.type) {
	case DISCOV_TYPE_BREDR:
		if (!hci_dev_test_flag(hdev, HCI_INQUIRY))
			hci_req_sync(hdev, bredr_inquiry,
				     DISCOV_BREDR_INQUIRY_LEN, HCI_CMD_TIMEOUT,
				     status);
		return;
	case DISCOV_TYPE_INTERLEAVED:
		/* When running simultaneous discovery, the LE scanning time
		 * should occupy the whole discovery time sine BR/EDR inquiry
		 * and LE scanning are scheduled by the controller.
		 *
		 * For interleaving discovery in comparison, BR/EDR inquiry
		 * and LE scanning are done sequentially with separate
		 * timeouts.
		 */
		if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY,
			     &hdev->quirks)) {
			timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
			/* During simultaneous discovery, we double LE scan
			 * interval. We must leave some time for the controller
			 * to do BR/EDR inquiry.
			 */
			hci_req_sync(hdev, interleaved_discov,
				     DISCOV_LE_SCAN_INT * 2, HCI_CMD_TIMEOUT,
				     status);
			break;
		}

		timeout = msecs_to_jiffies(hdev->discov_interleaved_timeout);
		hci_req_sync(hdev, active_scan, DISCOV_LE_SCAN_INT,
			     HCI_CMD_TIMEOUT, status);
		break;
	case DISCOV_TYPE_LE:
		timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
		hci_req_sync(hdev, active_scan, DISCOV_LE_SCAN_INT,
			     HCI_CMD_TIMEOUT, status);
		break;
	default:
		*status = HCI_ERROR_UNSPECIFIED;
		return;
	}

	if (*status)
		return;

	BT_DBG("%s timeout %u ms", hdev->name, jiffies_to_msecs(timeout));

	/* When service discovery is used and the controller has a
	 * strict duplicate filter, it is important to remember the
	 * start and duration of the scan. This is required for
	 * restarting scanning during the discovery phase.
	 */
	if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) &&
		     hdev->discovery.result_filtering) {
		hdev->discovery.scan_start = jiffies;
		hdev->discovery.scan_duration = timeout;
	}

	queue_delayed_work(hdev->req_workqueue, &hdev->le_scan_disable,
			   timeout);
}

bool hci_req_stop_discovery(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct discovery_state *d = &hdev->discovery;
	struct hci_cp_remote_name_req_cancel cp;
	struct inquiry_entry *e;
	bool ret = false;

	BT_DBG("%s state %u", hdev->name, hdev->discovery.state);

	if (d->state == DISCOVERY_FINDING || d->state == DISCOVERY_STOPPING) {
		if (test_bit(HCI_INQUIRY, &hdev->flags))
			hci_req_add(req, HCI_OP_INQUIRY_CANCEL, 0, NULL);

		if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
			cancel_delayed_work(&hdev->le_scan_disable);
			hci_req_add_le_scan_disable(req);
		}

		ret = true;
	} else {
		/* Passive scanning */
		if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
			hci_req_add_le_scan_disable(req);
			ret = true;
		}
	}

	/* No further actions needed for LE-only discovery */
	if (d->type == DISCOV_TYPE_LE)
		return ret;

	if (d->state == DISCOVERY_RESOLVING || d->state == DISCOVERY_STOPPING) {
		e = hci_inquiry_cache_lookup_resolve(hdev, BDADDR_ANY,
						     NAME_PENDING);
		if (!e)
			return ret;

		bacpy(&cp.bdaddr, &e->data.bdaddr);
		hci_req_add(req, HCI_OP_REMOTE_NAME_REQ_CANCEL, sizeof(cp),
			    &cp);
		ret = true;
	}

	return ret;
}

static int stop_discovery(struct hci_request *req, unsigned long opt)
{
	hci_dev_lock(req->hdev);
	hci_req_stop_discovery(req);
	hci_dev_unlock(req->hdev);

	return 0;
}

static void discov_update(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    discov_update);
	u8 status = 0;

	switch (hdev->discovery.state) {
	case DISCOVERY_STARTING:
		start_discovery(hdev, &status);
		mgmt_start_discovery_complete(hdev, status);
		if (status)
			hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
		else
			hci_discovery_set_state(hdev, DISCOVERY_FINDING);
		break;
	case DISCOVERY_STOPPING:
		hci_req_sync(hdev, stop_discovery, 0, HCI_CMD_TIMEOUT, &status);
		mgmt_stop_discovery_complete(hdev, status);
		if (!status)
			hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
		break;
	case DISCOVERY_STOPPED:
	default:
		return;
	}
}

static void discov_off(struct work_struct *work)
{
	struct hci_dev *hdev = container_of(work, struct hci_dev,
					    discov_off.work);

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

	hci_dev_lock(hdev);

	/* When discoverable timeout triggers, then just make sure
	 * the limited discoverable flag is cleared. Even in the case
	 * of a timeout triggered from general discoverable, it is
	 * safe to unconditionally clear the flag.
	 */
	hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
	hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
	hdev->discov_timeout = 0;

	hci_dev_unlock(hdev);

	hci_req_sync(hdev, discoverable_update, 0, HCI_CMD_TIMEOUT, NULL);
	mgmt_new_settings(hdev);
}

static int powered_update_hci(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;
	u8 link_sec;

	hci_dev_lock(hdev);

	if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED) &&
	    !lmp_host_ssp_capable(hdev)) {
		u8 mode = 0x01;

		hci_req_add(req, HCI_OP_WRITE_SSP_MODE, sizeof(mode), &mode);

		if (bredr_sc_enabled(hdev) && !lmp_host_sc_capable(hdev)) {
			u8 support = 0x01;

			hci_req_add(req, HCI_OP_WRITE_SC_SUPPORT,
				    sizeof(support), &support);
		}
	}

	if (hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
	    lmp_bredr_capable(hdev)) {
		struct hci_cp_write_le_host_supported cp;

		cp.le = 0x01;
		cp.simul = 0x00;

		/* Check first if we already have the right
		 * host state (host features set)
		 */
		if (cp.le != lmp_host_le_capable(hdev) ||
		    cp.simul != lmp_host_le_br_capable(hdev))
			hci_req_add(req, HCI_OP_WRITE_LE_HOST_SUPPORTED,
				    sizeof(cp), &cp);
	}

	if (hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
		/* Make sure the controller has a good default for
		 * advertising data. This also applies to the case
		 * where BR/EDR was toggled during the AUTO_OFF phase.
		 */
		if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
		    list_empty(&hdev->adv_instances)) {
			__hci_req_update_adv_data(req, 0x00);
			__hci_req_update_scan_rsp_data(req, 0x00);

			if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
				__hci_req_enable_advertising(req);
		} else if (!list_empty(&hdev->adv_instances)) {
			struct adv_info *adv_instance;

			adv_instance = list_first_entry(&hdev->adv_instances,
							struct adv_info, list);
			__hci_req_schedule_adv_instance(req,
							adv_instance->instance,
							true);
		}
	}

	link_sec = hci_dev_test_flag(hdev, HCI_LINK_SECURITY);
	if (link_sec != test_bit(HCI_AUTH, &hdev->flags))
		hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE,
			    sizeof(link_sec), &link_sec);

	if (lmp_bredr_capable(hdev)) {
		if (hci_dev_test_flag(hdev, HCI_FAST_CONNECTABLE))
			__hci_req_write_fast_connectable(req, true);
		else
			__hci_req_write_fast_connectable(req, false);
		__hci_req_update_scan(req);
		__hci_req_update_class(req);
		__hci_req_update_name(req);
		__hci_req_update_eir(req);
	}

	hci_dev_unlock(hdev);
	return 0;
}

int __hci_req_hci_power_on(struct hci_dev *hdev)
{
	/* Register the available SMP channels (BR/EDR and LE) only when
	 * successfully powering on the controller. This late
	 * registration is required so that LE SMP can clearly decide if
	 * the public address or static address is used.
	 */
	smp_register(hdev);

	return __hci_req_sync(hdev, powered_update_hci, 0, HCI_CMD_TIMEOUT,
			      NULL);
}

void hci_request_setup(struct hci_dev *hdev)
{
	INIT_WORK(&hdev->discov_update, discov_update);
	INIT_WORK(&hdev->bg_scan_update, bg_scan_update);
	INIT_WORK(&hdev->scan_update, scan_update_work);
	INIT_WORK(&hdev->connectable_update, connectable_update_work);
	INIT_WORK(&hdev->discoverable_update, discoverable_update_work);
	INIT_DELAYED_WORK(&hdev->discov_off, discov_off);
	INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
	INIT_DELAYED_WORK(&hdev->le_scan_restart, le_scan_restart_work);
	INIT_DELAYED_WORK(&hdev->adv_instance_expire, adv_timeout_expire);
}

void hci_request_cancel_all(struct hci_dev *hdev)
{
	hci_req_sync_cancel(hdev, ENODEV);

	cancel_work_sync(&hdev->discov_update);
	cancel_work_sync(&hdev->bg_scan_update);
	cancel_work_sync(&hdev->scan_update);
	cancel_work_sync(&hdev->connectable_update);
	cancel_work_sync(&hdev->discoverable_update);
	cancel_delayed_work_sync(&hdev->discov_off);
	cancel_delayed_work_sync(&hdev->le_scan_disable);
	cancel_delayed_work_sync(&hdev->le_scan_restart);

	if (hdev->adv_instance_timeout) {
		cancel_delayed_work_sync(&hdev->adv_instance_expire);
		hdev->adv_instance_timeout = 0;
	}
}