Free Electrons

Embedded Linux Experts

   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
/*
 * WSM host interface (HI) implementation for
 * ST-Ericsson CW1200 mac80211 drivers.
 *
 * Copyright (c) 2010, ST-Ericsson
 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
 *
 * 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.
 */

#include <linux/skbuff.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/random.h>

#include "cw1200.h"
#include "wsm.h"
#include "bh.h"
#include "sta.h"
#include "debug.h"

#define WSM_CMD_TIMEOUT		(2 * HZ) /* With respect to interrupt loss */
#define WSM_CMD_START_TIMEOUT	(7 * HZ)
#define WSM_CMD_RESET_TIMEOUT	(3 * HZ) /* 2 sec. timeout was observed.   */
#define WSM_CMD_MAX_TIMEOUT	(3 * HZ)

#define WSM_SKIP(buf, size)						\
	do {								\
		if ((buf)->data + size > (buf)->end)			\
			goto underflow;					\
		(buf)->data += size;					\
	} while (0)

#define WSM_GET(buf, ptr, size)						\
	do {								\
		if ((buf)->data + size > (buf)->end)			\
			goto underflow;					\
		memcpy(ptr, (buf)->data, size);				\
		(buf)->data += size;					\
	} while (0)

#define __WSM_GET(buf, type, type2, cvt)				\
	({								\
		type val;						\
		if ((buf)->data + sizeof(type) > (buf)->end)		\
			goto underflow;					\
		val = cvt(*(type2 *)(buf)->data);			\
		(buf)->data += sizeof(type);				\
		val;							\
	})

#define WSM_GET8(buf)  __WSM_GET(buf, u8, u8, (u8))
#define WSM_GET16(buf) __WSM_GET(buf, u16, __le16, __le16_to_cpu)
#define WSM_GET32(buf) __WSM_GET(buf, u32, __le32, __le32_to_cpu)

#define WSM_PUT(buf, ptr, size)						\
	do {								\
		if ((buf)->data + size > (buf)->end)		\
			if (wsm_buf_reserve((buf), size))	\
				goto nomem;				\
		memcpy((buf)->data, ptr, size);				\
		(buf)->data += size;					\
	} while (0)

#define __WSM_PUT(buf, val, type, type2, cvt)				\
	do {								\
		if ((buf)->data + sizeof(type) > (buf)->end)		\
			if (wsm_buf_reserve((buf), sizeof(type))) \
				goto nomem;				\
		*(type2 *)(buf)->data = cvt(val);			\
		(buf)->data += sizeof(type);				\
	} while (0)

#define WSM_PUT8(buf, val)  __WSM_PUT(buf, val, u8, u8, (u8))
#define WSM_PUT16(buf, val) __WSM_PUT(buf, val, u16, __le16, __cpu_to_le16)
#define WSM_PUT32(buf, val) __WSM_PUT(buf, val, u32, __le32, __cpu_to_le32)

static void wsm_buf_reset(struct wsm_buf *buf);
static int wsm_buf_reserve(struct wsm_buf *buf, size_t extra_size);

static int wsm_cmd_send(struct cw1200_common *priv,
			struct wsm_buf *buf,
			void *arg, u16 cmd, long tmo);

#define wsm_cmd_lock(__priv) mutex_lock(&((__priv)->wsm_cmd_mux))
#define wsm_cmd_unlock(__priv) mutex_unlock(&((__priv)->wsm_cmd_mux))

/* ******************************************************************** */
/* WSM API implementation						*/

static int wsm_generic_confirm(struct cw1200_common *priv,
			     void *arg,
			     struct wsm_buf *buf)
{
	u32 status = WSM_GET32(buf);
	if (status != WSM_STATUS_SUCCESS)
		return -EINVAL;
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

int wsm_configuration(struct cw1200_common *priv, struct wsm_configuration *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT32(buf, arg->dot11MaxTransmitMsduLifeTime);
	WSM_PUT32(buf, arg->dot11MaxReceiveLifeTime);
	WSM_PUT32(buf, arg->dot11RtsThreshold);

	/* DPD block. */
	WSM_PUT16(buf, arg->dpdData_size + 12);
	WSM_PUT16(buf, 1); /* DPD version */
	WSM_PUT(buf, arg->dot11StationId, ETH_ALEN);
	WSM_PUT16(buf, 5); /* DPD flags */
	WSM_PUT(buf, arg->dpdData, arg->dpdData_size);

	ret = wsm_cmd_send(priv, buf, arg,
			   WSM_CONFIGURATION_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

static int wsm_configuration_confirm(struct cw1200_common *priv,
				     struct wsm_configuration *arg,
				     struct wsm_buf *buf)
{
	int i;
	int status;

	status = WSM_GET32(buf);
	if (WARN_ON(status != WSM_STATUS_SUCCESS))
		return -EINVAL;

	WSM_GET(buf, arg->dot11StationId, ETH_ALEN);
	arg->dot11FrequencyBandsSupported = WSM_GET8(buf);
	WSM_SKIP(buf, 1);
	arg->supportedRateMask = WSM_GET32(buf);
	for (i = 0; i < 2; ++i) {
		arg->txPowerRange[i].min_power_level = WSM_GET32(buf);
		arg->txPowerRange[i].max_power_level = WSM_GET32(buf);
		arg->txPowerRange[i].stepping = WSM_GET32(buf);
	}
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

/* ******************************************************************** */

int wsm_reset(struct cw1200_common *priv, const struct wsm_reset *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	u16 cmd = WSM_RESET_REQ_ID | WSM_TX_LINK_ID(arg->link_id);

	wsm_cmd_lock(priv);

	WSM_PUT32(buf, arg->reset_statistics ? 0 : 1);
	ret = wsm_cmd_send(priv, buf, NULL, cmd, WSM_CMD_RESET_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

struct wsm_mib {
	u16 mib_id;
	void *buf;
	size_t buf_size;
};

int wsm_read_mib(struct cw1200_common *priv, u16 mib_id, void *_buf,
			size_t buf_size)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	struct wsm_mib mib_buf = {
		.mib_id = mib_id,
		.buf = _buf,
		.buf_size = buf_size,
	};
	wsm_cmd_lock(priv);

	WSM_PUT16(buf, mib_id);
	WSM_PUT16(buf, 0);

	ret = wsm_cmd_send(priv, buf, &mib_buf,
			   WSM_READ_MIB_REQ_ID, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

static int wsm_read_mib_confirm(struct cw1200_common *priv,
				struct wsm_mib *arg,
				struct wsm_buf *buf)
{
	u16 size;
	if (WARN_ON(WSM_GET32(buf) != WSM_STATUS_SUCCESS))
		return -EINVAL;

	if (WARN_ON(WSM_GET16(buf) != arg->mib_id))
		return -EINVAL;

	size = WSM_GET16(buf);
	if (size > arg->buf_size)
		size = arg->buf_size;

	WSM_GET(buf, arg->buf, size);
	arg->buf_size = size;
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

/* ******************************************************************** */

int wsm_write_mib(struct cw1200_common *priv, u16 mib_id, void *_buf,
			size_t buf_size)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	struct wsm_mib mib_buf = {
		.mib_id = mib_id,
		.buf = _buf,
		.buf_size = buf_size,
	};

	wsm_cmd_lock(priv);

	WSM_PUT16(buf, mib_id);
	WSM_PUT16(buf, buf_size);
	WSM_PUT(buf, _buf, buf_size);

	ret = wsm_cmd_send(priv, buf, &mib_buf,
			   WSM_WRITE_MIB_REQ_ID, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

static int wsm_write_mib_confirm(struct cw1200_common *priv,
				struct wsm_mib *arg,
				struct wsm_buf *buf)
{
	int ret;

	ret = wsm_generic_confirm(priv, arg, buf);
	if (ret)
		return ret;

	if (arg->mib_id == WSM_MIB_ID_OPERATIONAL_POWER_MODE) {
		/* OperationalMode: update PM status. */
		const char *p = arg->buf;
		cw1200_enable_powersave(priv, (p[0] & 0x0F) ? true : false);
	}
	return 0;
}

/* ******************************************************************** */

int wsm_scan(struct cw1200_common *priv, const struct wsm_scan *arg)
{
	int i;
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	if (arg->num_channels > 48)
		return -EINVAL;

	if (arg->num_ssids > 2)
		return -EINVAL;

	if (arg->band > 1)
		return -EINVAL;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->band);
	WSM_PUT8(buf, arg->type);
	WSM_PUT8(buf, arg->flags);
	WSM_PUT8(buf, arg->max_tx_rate);
	WSM_PUT32(buf, arg->auto_scan_interval);
	WSM_PUT8(buf, arg->num_probes);
	WSM_PUT8(buf, arg->num_channels);
	WSM_PUT8(buf, arg->num_ssids);
	WSM_PUT8(buf, arg->probe_delay);

	for (i = 0; i < arg->num_channels; ++i) {
		WSM_PUT16(buf, arg->ch[i].number);
		WSM_PUT16(buf, 0);
		WSM_PUT32(buf, arg->ch[i].min_chan_time);
		WSM_PUT32(buf, arg->ch[i].max_chan_time);
		WSM_PUT32(buf, 0);
	}

	for (i = 0; i < arg->num_ssids; ++i) {
		WSM_PUT32(buf, arg->ssids[i].length);
		WSM_PUT(buf, &arg->ssids[i].ssid[0],
			sizeof(arg->ssids[i].ssid));
	}

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_START_SCAN_REQ_ID, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_stop_scan(struct cw1200_common *priv)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	wsm_cmd_lock(priv);
	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_STOP_SCAN_REQ_ID, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;
}


static int wsm_tx_confirm(struct cw1200_common *priv,
			  struct wsm_buf *buf,
			  int link_id)
{
	struct wsm_tx_confirm tx_confirm;

	tx_confirm.packet_id = WSM_GET32(buf);
	tx_confirm.status = WSM_GET32(buf);
	tx_confirm.tx_rate = WSM_GET8(buf);
	tx_confirm.ack_failures = WSM_GET8(buf);
	tx_confirm.flags = WSM_GET16(buf);
	tx_confirm.media_delay = WSM_GET32(buf);
	tx_confirm.tx_queue_delay = WSM_GET32(buf);

	cw1200_tx_confirm_cb(priv, link_id, &tx_confirm);
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

static int wsm_multi_tx_confirm(struct cw1200_common *priv,
				struct wsm_buf *buf, int link_id)
{
	int ret;
	int count;
	int i;

	count = WSM_GET32(buf);
	if (WARN_ON(count <= 0))
		return -EINVAL;

	if (count > 1) {
		/* We already released one buffer, now for the rest */
		ret = wsm_release_tx_buffer(priv, count - 1);
		if (ret < 0)
			return ret;
		else if (ret > 0)
			cw1200_bh_wakeup(priv);
	}

	cw1200_debug_txed_multi(priv, count);
	for (i = 0; i < count; ++i) {
		ret = wsm_tx_confirm(priv, buf, link_id);
		if (ret)
			return ret;
	}
	return ret;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

/* ******************************************************************** */

static int wsm_join_confirm(struct cw1200_common *priv,
			    struct wsm_join_cnf *arg,
			    struct wsm_buf *buf)
{
	arg->status = WSM_GET32(buf);
	if (WARN_ON(arg->status) != WSM_STATUS_SUCCESS)
		return -EINVAL;

	arg->min_power_level = WSM_GET32(buf);
	arg->max_power_level = WSM_GET32(buf);

	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

int wsm_join(struct cw1200_common *priv, struct wsm_join *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	struct wsm_join_cnf resp;
	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->mode);
	WSM_PUT8(buf, arg->band);
	WSM_PUT16(buf, arg->channel_number);
	WSM_PUT(buf, &arg->bssid[0], sizeof(arg->bssid));
	WSM_PUT16(buf, arg->atim_window);
	WSM_PUT8(buf, arg->preamble_type);
	WSM_PUT8(buf, arg->probe_for_join);
	WSM_PUT8(buf, arg->dtim_period);
	WSM_PUT8(buf, arg->flags);
	WSM_PUT32(buf, arg->ssid_len);
	WSM_PUT(buf, &arg->ssid[0], sizeof(arg->ssid));
	WSM_PUT32(buf, arg->beacon_interval);
	WSM_PUT32(buf, arg->basic_rate_set);

	priv->tx_burst_idx = -1;
	ret = wsm_cmd_send(priv, buf, &resp,
			   WSM_JOIN_REQ_ID, WSM_CMD_TIMEOUT);
	/* TODO:  Update state based on resp.min|max_power_level */

	priv->join_complete_status = resp.status;

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_set_bss_params(struct cw1200_common *priv,
		       const struct wsm_set_bss_params *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, (arg->reset_beacon_loss ?  0x1 : 0));
	WSM_PUT8(buf, arg->beacon_lost_count);
	WSM_PUT16(buf, arg->aid);
	WSM_PUT32(buf, arg->operational_rate_set);

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_SET_BSS_PARAMS_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_add_key(struct cw1200_common *priv, const struct wsm_add_key *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT(buf, arg, sizeof(*arg));

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_ADD_KEY_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_remove_key(struct cw1200_common *priv, const struct wsm_remove_key *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->index);
	WSM_PUT8(buf, 0);
	WSM_PUT16(buf, 0);

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_REMOVE_KEY_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_set_tx_queue_params(struct cw1200_common *priv,
		const struct wsm_set_tx_queue_params *arg, u8 id)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	u8 queue_id_to_wmm_aci[] = {3, 2, 0, 1};

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, queue_id_to_wmm_aci[id]);
	WSM_PUT8(buf, 0);
	WSM_PUT8(buf, arg->ackPolicy);
	WSM_PUT8(buf, 0);
	WSM_PUT32(buf, arg->maxTransmitLifetime);
	WSM_PUT16(buf, arg->allowedMediumTime);
	WSM_PUT16(buf, 0);

	ret = wsm_cmd_send(priv, buf, NULL, 0x0012, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_set_edca_params(struct cw1200_common *priv,
				const struct wsm_edca_params *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	/* Implemented according to specification. */

	WSM_PUT16(buf, arg->params[3].cwmin);
	WSM_PUT16(buf, arg->params[2].cwmin);
	WSM_PUT16(buf, arg->params[1].cwmin);
	WSM_PUT16(buf, arg->params[0].cwmin);

	WSM_PUT16(buf, arg->params[3].cwmax);
	WSM_PUT16(buf, arg->params[2].cwmax);
	WSM_PUT16(buf, arg->params[1].cwmax);
	WSM_PUT16(buf, arg->params[0].cwmax);

	WSM_PUT8(buf, arg->params[3].aifns);
	WSM_PUT8(buf, arg->params[2].aifns);
	WSM_PUT8(buf, arg->params[1].aifns);
	WSM_PUT8(buf, arg->params[0].aifns);

	WSM_PUT16(buf, arg->params[3].txop_limit);
	WSM_PUT16(buf, arg->params[2].txop_limit);
	WSM_PUT16(buf, arg->params[1].txop_limit);
	WSM_PUT16(buf, arg->params[0].txop_limit);

	WSM_PUT32(buf, arg->params[3].max_rx_lifetime);
	WSM_PUT32(buf, arg->params[2].max_rx_lifetime);
	WSM_PUT32(buf, arg->params[1].max_rx_lifetime);
	WSM_PUT32(buf, arg->params[0].max_rx_lifetime);

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_EDCA_PARAMS_REQ_ID, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_switch_channel(struct cw1200_common *priv,
			const struct wsm_switch_channel *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->mode);
	WSM_PUT8(buf, arg->switch_count);
	WSM_PUT16(buf, arg->channel_number);

	priv->channel_switch_in_progress = 1;

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_SWITCH_CHANNEL_REQ_ID, WSM_CMD_TIMEOUT);
	if (ret)
		priv->channel_switch_in_progress = 0;

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_set_pm(struct cw1200_common *priv, const struct wsm_set_pm *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	priv->ps_mode_switch_in_progress = 1;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->mode);
	WSM_PUT8(buf, arg->fast_psm_idle_period);
	WSM_PUT8(buf, arg->ap_psm_change_period);
	WSM_PUT8(buf, arg->min_auto_pspoll_period);

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_SET_PM_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_start(struct cw1200_common *priv, const struct wsm_start *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT8(buf, arg->mode);
	WSM_PUT8(buf, arg->band);
	WSM_PUT16(buf, arg->channel_number);
	WSM_PUT32(buf, arg->ct_window);
	WSM_PUT32(buf, arg->beacon_interval);
	WSM_PUT8(buf, arg->dtim_period);
	WSM_PUT8(buf, arg->preamble);
	WSM_PUT8(buf, arg->probe_delay);
	WSM_PUT8(buf, arg->ssid_len);
	WSM_PUT(buf, arg->ssid, sizeof(arg->ssid));
	WSM_PUT32(buf, arg->basic_rate_set);

	priv->tx_burst_idx = -1;
	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_START_REQ_ID, WSM_CMD_START_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_beacon_transmit(struct cw1200_common *priv,
			const struct wsm_beacon_transmit *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT32(buf, arg->enable_beaconing ? 1 : 0);

	ret = wsm_cmd_send(priv, buf, NULL,
			   WSM_BEACON_TRANSMIT_REQ_ID, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_start_find(struct cw1200_common *priv)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);
	ret = wsm_cmd_send(priv, buf, NULL, 0x0019, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;
}

/* ******************************************************************** */

int wsm_stop_find(struct cw1200_common *priv)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);
	ret = wsm_cmd_send(priv, buf, NULL, 0x001A, WSM_CMD_TIMEOUT);
	wsm_cmd_unlock(priv);
	return ret;
}

/* ******************************************************************** */

int wsm_map_link(struct cw1200_common *priv, const struct wsm_map_link *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;
	u16 cmd = 0x001C | WSM_TX_LINK_ID(arg->link_id);

	wsm_cmd_lock(priv);

	WSM_PUT(buf, &arg->mac_addr[0], sizeof(arg->mac_addr));
	WSM_PUT16(buf, 0);

	ret = wsm_cmd_send(priv, buf, NULL, cmd, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */

int wsm_update_ie(struct cw1200_common *priv,
		  const struct wsm_update_ie *arg)
{
	int ret;
	struct wsm_buf *buf = &priv->wsm_cmd_buf;

	wsm_cmd_lock(priv);

	WSM_PUT16(buf, arg->what);
	WSM_PUT16(buf, arg->count);
	WSM_PUT(buf, arg->ies, arg->length);

	ret = wsm_cmd_send(priv, buf, NULL, 0x001B, WSM_CMD_TIMEOUT);

	wsm_cmd_unlock(priv);
	return ret;

nomem:
	wsm_cmd_unlock(priv);
	return -ENOMEM;
}

/* ******************************************************************** */
int wsm_set_probe_responder(struct cw1200_common *priv, bool enable)
{
	priv->rx_filter.probeResponder = enable;
	return wsm_set_rx_filter(priv, &priv->rx_filter);
}

/* ******************************************************************** */
/* WSM indication events implementation					*/
const char * const cw1200_fw_types[] = {
	"ETF",
	"WFM",
	"WSM",
	"HI test",
	"Platform test"
};

static int wsm_startup_indication(struct cw1200_common *priv,
					struct wsm_buf *buf)
{
	priv->wsm_caps.input_buffers     = WSM_GET16(buf);
	priv->wsm_caps.input_buffer_size = WSM_GET16(buf);
	priv->wsm_caps.hw_id	  = WSM_GET16(buf);
	priv->wsm_caps.hw_subid	  = WSM_GET16(buf);
	priv->wsm_caps.status	  = WSM_GET16(buf);
	priv->wsm_caps.fw_cap	  = WSM_GET16(buf);
	priv->wsm_caps.fw_type	  = WSM_GET16(buf);
	priv->wsm_caps.fw_api	  = WSM_GET16(buf);
	priv->wsm_caps.fw_build   = WSM_GET16(buf);
	priv->wsm_caps.fw_ver     = WSM_GET16(buf);
	WSM_GET(buf, priv->wsm_caps.fw_label, sizeof(priv->wsm_caps.fw_label));
	priv->wsm_caps.fw_label[sizeof(priv->wsm_caps.fw_label) - 1] = 0; /* Do not trust FW too much... */

	if (WARN_ON(priv->wsm_caps.status))
		return -EINVAL;

	if (WARN_ON(priv->wsm_caps.fw_type > 4))
		return -EINVAL;

	pr_info("CW1200 WSM init done.\n"
		"   Input buffers: %d x %d bytes\n"
		"   Hardware: %d.%d\n"
		"   %s firmware [%s], ver: %d, build: %d,"
		"   api: %d, cap: 0x%.4X\n",
		priv->wsm_caps.input_buffers,
		priv->wsm_caps.input_buffer_size,
		priv->wsm_caps.hw_id, priv->wsm_caps.hw_subid,
		cw1200_fw_types[priv->wsm_caps.fw_type],
		priv->wsm_caps.fw_label, priv->wsm_caps.fw_ver,
		priv->wsm_caps.fw_build,
		priv->wsm_caps.fw_api, priv->wsm_caps.fw_cap);

	/* Disable unsupported frequency bands */
	if (!(priv->wsm_caps.fw_cap & 0x1))
		priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
	if (!(priv->wsm_caps.fw_cap & 0x2))
		priv->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;

	priv->firmware_ready = 1;
	wake_up(&priv->wsm_startup_done);
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

static int wsm_receive_indication(struct cw1200_common *priv,
				  int link_id,
				  struct wsm_buf *buf,
				  struct sk_buff **skb_p)
{
	struct wsm_rx rx;
	struct ieee80211_hdr *hdr;
	size_t hdr_len;
	__le16 fctl;

	rx.status = WSM_GET32(buf);
	rx.channel_number = WSM_GET16(buf);
	rx.rx_rate = WSM_GET8(buf);
	rx.rcpi_rssi = WSM_GET8(buf);
	rx.flags = WSM_GET32(buf);

	/* FW Workaround: Drop probe resp or
	   beacon when RSSI is 0
	*/
	hdr = (struct ieee80211_hdr *)(*skb_p)->data;

	if (!rx.rcpi_rssi &&
	    (ieee80211_is_probe_resp(hdr->frame_control) ||
	     ieee80211_is_beacon(hdr->frame_control)))
		return 0;

	/* If no RSSI subscription has been made,
	 * convert RCPI to RSSI here
	 */
	if (!priv->cqm_use_rssi)
		rx.rcpi_rssi = rx.rcpi_rssi / 2 - 110;

	fctl = *(__le16 *)buf->data;
	hdr_len = buf->data - buf->begin;
	skb_pull(*skb_p, hdr_len);
	if (!rx.status && ieee80211_is_deauth(fctl)) {
		if (priv->join_status == CW1200_JOIN_STATUS_STA) {
			/* Shedule unjoin work */
			pr_debug("[WSM] Issue unjoin command (RX).\n");
			wsm_lock_tx_async(priv);
			if (queue_work(priv->workqueue,
				       &priv->unjoin_work) <= 0)
				wsm_unlock_tx(priv);
		}
	}
	cw1200_rx_cb(priv, &rx, link_id, skb_p);
	if (*skb_p)
		skb_push(*skb_p, hdr_len);

	return 0;

underflow:
	return -EINVAL;
}

static int wsm_event_indication(struct cw1200_common *priv, struct wsm_buf *buf)
{
	int first;
	struct cw1200_wsm_event *event;

	if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) {
		/* STA is stopped. */
		return 0;
	}

	event = kzalloc(sizeof(struct cw1200_wsm_event), GFP_KERNEL);
	if (!event)
		return -ENOMEM;

	event->evt.id = WSM_GET32(buf);
	event->evt.data = WSM_GET32(buf);

	pr_debug("[WSM] Event: %d(%d)\n",
		 event->evt.id, event->evt.data);

	spin_lock(&priv->event_queue_lock);
	first = list_empty(&priv->event_queue);
	list_add_tail(&event->link, &priv->event_queue);
	spin_unlock(&priv->event_queue_lock);

	if (first)
		queue_work(priv->workqueue, &priv->event_handler);

	return 0;

underflow:
	kfree(event);
	return -EINVAL;
}

static int wsm_channel_switch_indication(struct cw1200_common *priv,
					 struct wsm_buf *buf)
{
	WARN_ON(WSM_GET32(buf));

	priv->channel_switch_in_progress = 0;
	wake_up(&priv->channel_switch_done);

	wsm_unlock_tx(priv);

	return 0;

underflow:
	return -EINVAL;
}

static int wsm_set_pm_indication(struct cw1200_common *priv,
				 struct wsm_buf *buf)
{
	/* TODO:  Check buf (struct wsm_set_pm_complete) for validity */
	if (priv->ps_mode_switch_in_progress) {
		priv->ps_mode_switch_in_progress = 0;
		wake_up(&priv->ps_mode_switch_done);
	}
	return 0;
}

static int wsm_scan_started(struct cw1200_common *priv, void *arg,
			    struct wsm_buf *buf)
{
	u32 status = WSM_GET32(buf);
	if (status != WSM_STATUS_SUCCESS) {
		cw1200_scan_failed_cb(priv);
		return -EINVAL;
	}
	return 0;

underflow:
	WARN_ON(1);
	return -EINVAL;
}

static int wsm_scan_complete_indication(struct cw1200_common *priv,
					struct wsm_buf *buf)
{
	struct wsm_scan_complete arg;
	arg.status = WSM_GET32(buf);
	arg.psm = WSM_GET8(buf);
	arg.num_channels = WSM_GET8(buf);
	cw1200_scan_complete_cb(priv, &arg);

	return 0;

underflow:
	return -EINVAL;
}

static int wsm_join_complete_indication(struct cw1200_common *priv,
					struct wsm_buf *buf)
{
	struct wsm_join_complete arg;
	arg.status = WSM_GET32(buf);
	pr_debug("[WSM] Join complete indication, status: %d\n", arg.status);
	cw1200_join_complete_cb(priv, &arg);

	return 0;

underflow:
	return -EINVAL;
}

static int wsm_find_complete_indication(struct cw1200_common *priv,
					struct wsm_buf *buf)
{
	pr_warn("Implement find_complete_indication\n");
	return 0;
}

static int wsm_ba_timeout_indication(struct cw1200_common *priv,
				     struct wsm_buf *buf)
{
	u32 dummy;
	u8 tid;
	u8 dummy2;
	u8 addr[ETH_ALEN];

	dummy = WSM_GET32(buf);
	tid = WSM_GET8(buf);
	dummy2 = WSM_GET8(buf);
	WSM_GET(buf, addr, ETH_ALEN);

	pr_info("BlockACK timeout, tid %d, addr %pM\n",
		tid, addr);

	return 0;

underflow:
	return -EINVAL;
}

static int wsm_suspend_resume_indication(struct cw1200_common *priv,
					 int link_id, struct wsm_buf *buf)
{
	u32 flags;
	struct wsm_suspend_resume arg;

	flags = WSM_GET32(buf);
	arg.link_id = link_id;
	arg.stop = !(flags & 1);
	arg.multicast = !!(flags & 8);
	arg.queue = (flags >> 1) & 3;

	cw1200_suspend_resume(priv, &arg);

	return 0;

underflow:
	return -EINVAL;
}


/* ******************************************************************** */
/* WSM TX								*/

static int wsm_cmd_send(struct cw1200_common *priv,
			struct wsm_buf *buf,
			void *arg, u16 cmd, long tmo)
{
	size_t buf_len = buf->data - buf->begin;
	int ret;

	/* Don't bother if we're dead. */
	if (priv->bh_error) {
		ret = 0;
		goto done;
	}

	/* Block until the cmd buffer is completed.  Tortuous. */
	spin_lock(&priv->wsm_cmd.lock);
	while (!priv->wsm_cmd.done) {
		spin_unlock(&priv->wsm_cmd.lock);
		spin_lock(&priv->wsm_cmd.lock);
	}
	priv->wsm_cmd.done = 0;
	spin_unlock(&priv->wsm_cmd.lock);

	if (cmd == WSM_WRITE_MIB_REQ_ID ||
	    cmd == WSM_READ_MIB_REQ_ID)
		pr_debug("[WSM] >>> 0x%.4X [MIB: 0x%.4X] (%zu)\n",
			 cmd, __le16_to_cpu(((__le16 *)buf->begin)[2]),
			 buf_len);
	else
		pr_debug("[WSM] >>> 0x%.4X (%zu)\n", cmd, buf_len);

	/* Due to buggy SPI on CW1200, we need to
	 * pad the message by a few bytes to ensure
	 * that it's completely received.
	 */
	buf_len += 4;

	/* Fill HI message header */
	/* BH will add sequence number */
	((__le16 *)buf->begin)[0] = __cpu_to_le16(buf_len);
	((__le16 *)buf->begin)[1] = __cpu_to_le16(cmd);

	spin_lock(&priv->wsm_cmd.lock);
	BUG_ON(priv->wsm_cmd.ptr);
	priv->wsm_cmd.ptr = buf->begin;
	priv->wsm_cmd.len = buf_len;
	priv->wsm_cmd.arg = arg;
	priv->wsm_cmd.cmd = cmd;
	spin_unlock(&priv->wsm_cmd.lock);

	cw1200_bh_wakeup(priv);

	/* Wait for command completion */
	ret = wait_event_timeout(priv->wsm_cmd_wq,
				 priv->wsm_cmd.done, tmo);

	if (!ret && !priv->wsm_cmd.done) {
		spin_lock(&priv->wsm_cmd.lock);
		priv->wsm_cmd.done = 1;
		priv->wsm_cmd.ptr = NULL;
		spin_unlock(&priv->wsm_cmd.lock);
		if (priv->bh_error) {
			/* Return ok to help system cleanup */
			ret = 0;
		} else {
			pr_err("CMD req (0x%04x) stuck in firmware, killing BH\n", priv->wsm_cmd.cmd);
			print_hex_dump_bytes("REQDUMP: ", DUMP_PREFIX_NONE,
					     buf->begin, buf_len);
			pr_err("Outstanding outgoing frames:  %d\n", priv->hw_bufs_used);

			/* Kill BH thread to report the error to the top layer. */
			atomic_add(1, &priv->bh_term);
			wake_up(&priv->bh_wq);
			ret = -ETIMEDOUT;
		}
	} else {
		spin_lock(&priv->wsm_cmd.lock);
		BUG_ON(!priv->wsm_cmd.done);
		ret = priv->wsm_cmd.ret;
		spin_unlock(&priv->wsm_cmd.lock);
	}
done:
	wsm_buf_reset(buf);
	return ret;
}

/* ******************************************************************** */
/* WSM TX port control							*/

void wsm_lock_tx(struct cw1200_common *priv)
{
	wsm_cmd_lock(priv);
	if (atomic_add_return(1, &priv->tx_lock) == 1) {
		if (wsm_flush_tx(priv))
			pr_debug("[WSM] TX is locked.\n");
	}
	wsm_cmd_unlock(priv);
}

void wsm_lock_tx_async(struct cw1200_common *priv)
{
	if (atomic_add_return(1, &priv->tx_lock) == 1)
		pr_debug("[WSM] TX is locked (async).\n");
}

bool wsm_flush_tx(struct cw1200_common *priv)
{
	unsigned long timestamp = jiffies;
	bool pending = false;
	long timeout;
	int i;

	/* Flush must be called with TX lock held. */
	BUG_ON(!atomic_read(&priv->tx_lock));

	/* First check if we really need to do something.
	 * It is safe to use unprotected access, as hw_bufs_used
	 * can only decrements.
	 */
	if (!priv->hw_bufs_used)
		return true;

	if (priv->bh_error) {
		/* In case of failure do not wait for magic. */
		pr_err("[WSM] Fatal error occurred, will not flush TX.\n");
		return false;
	} else {
		/* Get a timestamp of "oldest" frame */
		for (i = 0; i < 4; ++i)
			pending |= cw1200_queue_get_xmit_timestamp(
					&priv->tx_queue[i],
					&timestamp, 0xffffffff);
		/* If there's nothing pending, we're good */
		if (!pending)
			return true;

		timeout = timestamp + WSM_CMD_LAST_CHANCE_TIMEOUT - jiffies;
		if (timeout < 0 || wait_event_timeout(priv->bh_evt_wq,
						      !priv->hw_bufs_used,
						      timeout) <= 0) {
			/* Hmmm... Not good. Frame had stuck in firmware. */
			priv->bh_error = 1;
			wiphy_err(priv->hw->wiphy, "[WSM] TX Frames (%d) stuck in firmware, killing BH\n", priv->hw_bufs_used);
			wake_up(&priv->bh_wq);
			return false;
		}

		/* Ok, everything is flushed. */
		return true;
	}
}

void wsm_unlock_tx(struct cw1200_common *priv)
{
	int tx_lock;
	tx_lock = atomic_sub_return(1, &priv->tx_lock);
	BUG_ON(tx_lock < 0);

	if (tx_lock == 0) {
		if (!priv->bh_error)
			cw1200_bh_wakeup(priv);
		pr_debug("[WSM] TX is unlocked.\n");
	}
}

/* ******************************************************************** */
/* WSM RX								*/

int wsm_handle_exception(struct cw1200_common *priv, u8 *data, size_t len)
{
	struct wsm_buf buf;
	u32 reason;
	u32 reg[18];
	char fname[48];
	unsigned int i;

	static const char * const reason_str[] = {
		"undefined instruction",
		"prefetch abort",
		"data abort",
		"unknown error",
	};

	buf.begin = buf.data = data;
	buf.end = &buf.begin[len];

	reason = WSM_GET32(&buf);
	for (i = 0; i < ARRAY_SIZE(reg); ++i)
		reg[i] = WSM_GET32(&buf);
	WSM_GET(&buf, fname, sizeof(fname));

	if (reason < 4)
		wiphy_err(priv->hw->wiphy,
			  "Firmware exception: %s.\n",
			  reason_str[reason]);
	else
		wiphy_err(priv->hw->wiphy,
			  "Firmware assert at %.*s, line %d\n",
			  (int) sizeof(fname), fname, reg[1]);

	for (i = 0; i < 12; i += 4)
		wiphy_err(priv->hw->wiphy,
			  "R%d: 0x%.8X, R%d: 0x%.8X, R%d: 0x%.8X, R%d: 0x%.8X,\n",
			  i + 0, reg[i + 0], i + 1, reg[i + 1],
			  i + 2, reg[i + 2], i + 3, reg[i + 3]);
	wiphy_err(priv->hw->wiphy,
		  "R12: 0x%.8X, SP: 0x%.8X, LR: 0x%.8X, PC: 0x%.8X,\n",
		  reg[i + 0], reg[i + 1], reg[i + 2], reg[i + 3]);
	i += 4;
	wiphy_err(priv->hw->wiphy,
		  "CPSR: 0x%.8X, SPSR: 0x%.8X\n",
		  reg[i + 0], reg[i + 1]);

	print_hex_dump_bytes("R1: ", DUMP_PREFIX_NONE,
			     fname, sizeof(fname));
	return 0;

underflow:
	wiphy_err(priv->hw->wiphy, "Firmware exception.\n");
	print_hex_dump_bytes("Exception: ", DUMP_PREFIX_NONE,
			     data, len);
	return -EINVAL;
}

int wsm_handle_rx(struct cw1200_common *priv, u16 id,
		  struct wsm_hdr *wsm, struct sk_buff **skb_p)
{
	int ret = 0;
	struct wsm_buf wsm_buf;
	int link_id = (id >> 6) & 0x0F;

	/* Strip link id. */
	id &= ~WSM_TX_LINK_ID(WSM_TX_LINK_ID_MAX);

	wsm_buf.begin = (u8 *)&wsm[0];
	wsm_buf.data = (u8 *)&wsm[1];
	wsm_buf.end = &wsm_buf.begin[__le16_to_cpu(wsm->len)];

	pr_debug("[WSM] <<< 0x%.4X (%td)\n", id,
		 wsm_buf.end - wsm_buf.begin);

	if (id == WSM_TX_CONFIRM_IND_ID) {
		ret = wsm_tx_confirm(priv, &wsm_buf, link_id);
	} else if (id == WSM_MULTI_TX_CONFIRM_ID) {
		ret = wsm_multi_tx_confirm(priv, &wsm_buf, link_id);
	} else if (id & 0x0400) {
		void *wsm_arg;
		u16 wsm_cmd;

		/* Do not trust FW too much. Protection against repeated
		 * response and race condition removal (see above).
		 */
		spin_lock(&priv->wsm_cmd.lock);
		wsm_arg = priv->wsm_cmd.arg;
		wsm_cmd = priv->wsm_cmd.cmd &
				~WSM_TX_LINK_ID(WSM_TX_LINK_ID_MAX);
		priv->wsm_cmd.cmd = 0xFFFF;
		spin_unlock(&priv->wsm_cmd.lock);

		if (WARN_ON((id & ~0x0400) != wsm_cmd)) {
			/* Note that any non-zero is a fatal retcode. */
			ret = -EINVAL;
			goto out;
		}

		/* Note that wsm_arg can be NULL in case of timeout in
		 * wsm_cmd_send().
		 */

		switch (id) {
		case WSM_READ_MIB_RESP_ID:
			if (wsm_arg)
				ret = wsm_read_mib_confirm(priv, wsm_arg,
								&wsm_buf);
			break;
		case WSM_WRITE_MIB_RESP_ID:
			if (wsm_arg)
				ret = wsm_write_mib_confirm(priv, wsm_arg,
							    &wsm_buf);
			break;
		case WSM_START_SCAN_RESP_ID:
			if (wsm_arg)
				ret = wsm_scan_started(priv, wsm_arg, &wsm_buf);
			break;
		case WSM_CONFIGURATION_RESP_ID:
			if (wsm_arg)
				ret = wsm_configuration_confirm(priv, wsm_arg,
								&wsm_buf);
			break;
		case WSM_JOIN_RESP_ID:
			if (wsm_arg)
				ret = wsm_join_confirm(priv, wsm_arg, &wsm_buf);
			break;
		case WSM_STOP_SCAN_RESP_ID:
		case WSM_RESET_RESP_ID:
		case WSM_ADD_KEY_RESP_ID:
		case WSM_REMOVE_KEY_RESP_ID:
		case WSM_SET_PM_RESP_ID:
		case WSM_SET_BSS_PARAMS_RESP_ID:
		case 0x0412: /* set_tx_queue_params */
		case WSM_EDCA_PARAMS_RESP_ID:
		case WSM_SWITCH_CHANNEL_RESP_ID:
		case WSM_START_RESP_ID:
		case WSM_BEACON_TRANSMIT_RESP_ID:
		case 0x0419: /* start_find */
		case 0x041A: /* stop_find */
		case 0x041B: /* update_ie */
		case 0x041C: /* map_link */
			WARN_ON(wsm_arg != NULL);
			ret = wsm_generic_confirm(priv, wsm_arg, &wsm_buf);
			if (ret) {
				wiphy_warn(priv->hw->wiphy,
					   "wsm_generic_confirm failed for request 0x%04x.\n",
					   id & ~0x0400);

				/* often 0x407 and 0x410 occur, this means we're dead.. */
				if (priv->join_status >= CW1200_JOIN_STATUS_JOINING) {
					wsm_lock_tx(priv);
					if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0)
						wsm_unlock_tx(priv);
				}
			}
			break;
		default:
			wiphy_warn(priv->hw->wiphy,
				   "Unrecognized confirmation 0x%04x\n",
				   id & ~0x0400);
		}

		spin_lock(&priv->wsm_cmd.lock);
		priv->wsm_cmd.ret = ret;
		priv->wsm_cmd.done = 1;
		spin_unlock(&priv->wsm_cmd.lock);

		ret = 0; /* Error response from device should ne stop BH. */

		wake_up(&priv->wsm_cmd_wq);
	} else if (id & 0x0800) {
		switch (id) {
		case WSM_STARTUP_IND_ID:
			ret = wsm_startup_indication(priv, &wsm_buf);
			break;
		case WSM_RECEIVE_IND_ID:
			ret = wsm_receive_indication(priv, link_id,
						     &wsm_buf, skb_p);
			break;
		case 0x0805:
			ret = wsm_event_indication(priv, &wsm_buf);
			break;
		case WSM_SCAN_COMPLETE_IND_ID:
			ret = wsm_scan_complete_indication(priv, &wsm_buf);
			break;
		case 0x0808:
			ret = wsm_ba_timeout_indication(priv, &wsm_buf);
			break;
		case 0x0809:
			ret = wsm_set_pm_indication(priv, &wsm_buf);
			break;
		case 0x080A:
			ret = wsm_channel_switch_indication(priv, &wsm_buf);
			break;
		case 0x080B:
			ret = wsm_find_complete_indication(priv, &wsm_buf);
			break;
		case 0x080C:
			ret = wsm_suspend_resume_indication(priv,
					link_id, &wsm_buf);
			break;
		case 0x080F:
			ret = wsm_join_complete_indication(priv, &wsm_buf);
			break;
		default:
			pr_warn("Unrecognised WSM ID %04x\n", id);
		}
	} else {
		WARN_ON(1);
		ret = -EINVAL;
	}
out:
	return ret;
}

static bool wsm_handle_tx_data(struct cw1200_common *priv,
			       struct wsm_tx *wsm,
			       const struct ieee80211_tx_info *tx_info,
			       const struct cw1200_txpriv *txpriv,
			       struct cw1200_queue *queue)
{
	bool handled = false;
	const struct ieee80211_hdr *frame =
		(struct ieee80211_hdr *)&((u8 *)wsm)[txpriv->offset];
	__le16 fctl = frame->frame_control;
	enum {
		do_probe,
		do_drop,
		do_wep,
		do_tx,
	} action = do_tx;

	switch (priv->mode) {
	case NL80211_IFTYPE_STATION:
		if (priv->join_status == CW1200_JOIN_STATUS_MONITOR)
			action = do_tx;
		else if (priv->join_status < CW1200_JOIN_STATUS_PRE_STA)
			action = do_drop;
		break;
	case NL80211_IFTYPE_AP:
		if (!priv->join_status) {
			action = do_drop;
		} else if (!(BIT(txpriv->raw_link_id) &
			     (BIT(0) | priv->link_id_map))) {
			wiphy_warn(priv->hw->wiphy,
				   "A frame with expired link id is dropped.\n");
			action = do_drop;
		}
		if (cw1200_queue_get_generation(wsm->packet_id) >
				CW1200_MAX_REQUEUE_ATTEMPTS) {
			/* HACK!!! WSM324 firmware has tendency to requeue
			 * multicast frames in a loop, causing performance
			 * drop and high power consumption of the driver.
			 * In this situation it is better just to drop
			 * the problematic frame.
			 */
			wiphy_warn(priv->hw->wiphy,
				   "Too many attempts to requeue a frame; dropped.\n");
			action = do_drop;
		}
		break;
	case NL80211_IFTYPE_ADHOC:
		if (priv->join_status != CW1200_JOIN_STATUS_IBSS)
			action = do_drop;
		break;
	case NL80211_IFTYPE_MESH_POINT:
		action = do_tx; /* TODO:  Test me! */
		break;
	case NL80211_IFTYPE_MONITOR:
	default:
		action = do_drop;
		break;
	}

	if (action == do_tx) {
		if (ieee80211_is_nullfunc(fctl)) {
			spin_lock(&priv->bss_loss_lock);
			if (priv->bss_loss_state) {
				priv->bss_loss_confirm_id = wsm->packet_id;
				wsm->queue_id = WSM_QUEUE_VOICE;
			}
			spin_unlock(&priv->bss_loss_lock);
		} else if (ieee80211_is_probe_req(fctl)) {
			action = do_probe;
		} else if (ieee80211_is_deauth(fctl) &&
			   priv->mode != NL80211_IFTYPE_AP) {
			pr_debug("[WSM] Issue unjoin command due to tx deauth.\n");
			wsm_lock_tx_async(priv);
			if (queue_work(priv->workqueue,
				       &priv->unjoin_work) <= 0)
				wsm_unlock_tx(priv);
		} else if (ieee80211_has_protected(fctl) &&
			   tx_info->control.hw_key &&
			   tx_info->control.hw_key->keyidx != priv->wep_default_key_id &&
			   (tx_info->control.hw_key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
			    tx_info->control.hw_key->cipher == WLAN_CIPHER_SUITE_WEP104)) {
			action = do_wep;
		}
	}

	switch (action) {
	case do_probe:
		/* An interesting FW "feature". Device filters probe responses.
		 * The easiest way to get it back is to convert
		 * probe request into WSM start_scan command.
		 */
		pr_debug("[WSM] Convert probe request to scan.\n");
		wsm_lock_tx_async(priv);
		priv->pending_frame_id = wsm->packet_id;
		if (queue_delayed_work(priv->workqueue,
				       &priv->scan.probe_work, 0) <= 0)
			wsm_unlock_tx(priv);
		handled = true;
		break;
	case do_drop:
		pr_debug("[WSM] Drop frame (0x%.4X).\n", fctl);
		BUG_ON(cw1200_queue_remove(queue, wsm->packet_id));
		handled = true;
		break;
	case do_wep:
		pr_debug("[WSM] Issue set_default_wep_key.\n");
		wsm_lock_tx_async(priv);
		priv->wep_default_key_id = tx_info->control.hw_key->keyidx;
		priv->pending_frame_id = wsm->packet_id;
		if (queue_work(priv->workqueue, &priv->wep_key_work) <= 0)
			wsm_unlock_tx(priv);
		handled = true;
		break;
	case do_tx:
		pr_debug("[WSM] Transmit frame.\n");
		break;
	default:
		/* Do nothing */
		break;
	}
	return handled;
}

static int cw1200_get_prio_queue(struct cw1200_common *priv,
				 u32 link_id_map, int *total)
{
	static const int urgent = BIT(CW1200_LINK_ID_AFTER_DTIM) |
		BIT(CW1200_LINK_ID_UAPSD);
	struct wsm_edca_queue_params *edca;
	unsigned score, best = -1;
	int winner = -1;
	int queued;
	int i;

	/* search for a winner using edca params */
	for (i = 0; i < 4; ++i) {
		queued = cw1200_queue_get_num_queued(&priv->tx_queue[i],
				link_id_map);
		if (!queued)
			continue;
		*total += queued;
		edca = &priv->edca.params[i];
		score = ((edca->aifns + edca->cwmin) << 16) +
			((edca->cwmax - edca->cwmin) *
			 (get_random_int() & 0xFFFF));
		if (score < best && (winner < 0 || i != 3)) {
			best = score;
			winner = i;
		}
	}

	/* override winner if bursting */
	if (winner >= 0 && priv->tx_burst_idx >= 0 &&
	    winner != priv->tx_burst_idx &&
	    !cw1200_queue_get_num_queued(
		    &priv->tx_queue[winner],
		    link_id_map & urgent) &&
	    cw1200_queue_get_num_queued(
		    &priv->tx_queue[priv->tx_burst_idx],
		    link_id_map))
		winner = priv->tx_burst_idx;

	return winner;
}

static int wsm_get_tx_queue_and_mask(struct cw1200_common *priv,
				     struct cw1200_queue **queue_p,
				     u32 *tx_allowed_mask_p,
				     bool *more)
{
	int idx;
	u32 tx_allowed_mask;
	int total = 0;

	/* Search for a queue with multicast frames buffered */
	if (priv->tx_multicast) {
		tx_allowed_mask = BIT(CW1200_LINK_ID_AFTER_DTIM);
		idx = cw1200_get_prio_queue(priv,
				tx_allowed_mask, &total);
		if (idx >= 0) {
			*more = total > 1;
			goto found;
		}
	}

	/* Search for unicast traffic */
	tx_allowed_mask = ~priv->sta_asleep_mask;
	tx_allowed_mask |= BIT(CW1200_LINK_ID_UAPSD);
	if (priv->sta_asleep_mask) {
		tx_allowed_mask |= priv->pspoll_mask;
		tx_allowed_mask &= ~BIT(CW1200_LINK_ID_AFTER_DTIM);
	} else {
		tx_allowed_mask |= BIT(CW1200_LINK_ID_AFTER_DTIM);
	}
	idx = cw1200_get_prio_queue(priv,
			tx_allowed_mask, &total);
	if (idx < 0)
		return -ENOENT;

found:
	*queue_p = &priv->tx_queue[idx];
	*tx_allowed_mask_p = tx_allowed_mask;
	return 0;
}

int wsm_get_tx(struct cw1200_common *priv, u8 **data,
	       size_t *tx_len, int *burst)
{
	struct wsm_tx *wsm = NULL;
	struct ieee80211_tx_info *tx_info;
	struct cw1200_queue *queue = NULL;
	int queue_num;
	u32 tx_allowed_mask = 0;
	const struct cw1200_txpriv *txpriv = NULL;
	int count = 0;

	/* More is used only for broadcasts. */
	bool more = false;

	if (priv->wsm_cmd.ptr) { /* CMD request */
		++count;
		spin_lock(&priv->wsm_cmd.lock);
		BUG_ON(!priv->wsm_cmd.ptr);
		*data = priv->wsm_cmd.ptr;
		*tx_len = priv->wsm_cmd.len;
		*burst = 1;
		spin_unlock(&priv->wsm_cmd.lock);
	} else {
		for (;;) {
			int ret;

			if (atomic_add_return(0, &priv->tx_lock))
				break;

			spin_lock_bh(&priv->ps_state_lock);

			ret = wsm_get_tx_queue_and_mask(priv, &queue,
							&tx_allowed_mask, &more);
			queue_num = queue - priv->tx_queue;

			if (priv->buffered_multicasts &&
			    (ret || !more) &&
			    (priv->tx_multicast || !priv->sta_asleep_mask)) {
				priv->buffered_multicasts = false;
				if (priv->tx_multicast) {
					priv->tx_multicast = false;
					queue_work(priv->workqueue,
						   &priv->multicast_stop_work);
				}
			}

			spin_unlock_bh(&priv->ps_state_lock);

			if (ret)
				break;

			if (cw1200_queue_get(queue,
					     tx_allowed_mask,
					     &wsm, &tx_info, &txpriv))
				continue;

			if (wsm_handle_tx_data(priv, wsm,
					       tx_info, txpriv, queue))
				continue;  /* Handled by WSM */

			wsm->hdr.id &= __cpu_to_le16(
				~WSM_TX_LINK_ID(WSM_TX_LINK_ID_MAX));
			wsm->hdr.id |= cpu_to_le16(
				WSM_TX_LINK_ID(txpriv->raw_link_id));
			priv->pspoll_mask &= ~BIT(txpriv->raw_link_id);

			*data = (u8 *)wsm;
			*tx_len = __le16_to_cpu(wsm->hdr.len);

			/* allow bursting if txop is set */
			if (priv->edca.params[queue_num].txop_limit)
				*burst = min(*burst,
					     (int)cw1200_queue_get_num_queued(queue, tx_allowed_mask) + 1);
			else
				*burst = 1;

			/* store index of bursting queue */
			if (*burst > 1)
				priv->tx_burst_idx = queue_num;
			else
				priv->tx_burst_idx = -1;

			if (more) {
				struct ieee80211_hdr *hdr =
					(struct ieee80211_hdr *)
					&((u8 *)wsm)[txpriv->offset];
				/* more buffered multicast/broadcast frames
				 *  ==> set MoreData flag in IEEE 802.11 header
				 *  to inform PS STAs
				 */
				hdr->frame_control |=
					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
			}

			pr_debug("[WSM] >>> 0x%.4X (%zu) %p %c\n",
				 0x0004, *tx_len, *data,
				 wsm->more ? 'M' : ' ');
			++count;
			break;
		}
	}

	return count;
}

void wsm_txed(struct cw1200_common *priv, u8 *data)
{
	if (data == priv->wsm_cmd.ptr) {
		spin_lock(&priv->wsm_cmd.lock);
		priv->wsm_cmd.ptr = NULL;
		spin_unlock(&priv->wsm_cmd.lock);
	}
}

/* ******************************************************************** */
/* WSM buffer								*/

void wsm_buf_init(struct wsm_buf *buf)
{
	BUG_ON(buf->begin);
	buf->begin = kmalloc(FWLOAD_BLOCK_SIZE, GFP_KERNEL | GFP_DMA);
	buf->end = buf->begin ? &buf->begin[FWLOAD_BLOCK_SIZE] : buf->begin;
	wsm_buf_reset(buf);
}

void wsm_buf_deinit(struct wsm_buf *buf)
{
	kfree(buf->begin);
	buf->begin = buf->data = buf->end = NULL;
}

static void wsm_buf_reset(struct wsm_buf *buf)
{
	if (buf->begin) {
		buf->data = &buf->begin[4];
		*(u32 *)buf->begin = 0;
	} else {
		buf->data = buf->begin;
	}
}

static int wsm_buf_reserve(struct wsm_buf *buf, size_t extra_size)
{
	size_t pos = buf->data - buf->begin;
	size_t size = pos + extra_size;

	size = round_up(size, FWLOAD_BLOCK_SIZE);

	buf->begin = krealloc(buf->begin, size, GFP_KERNEL | GFP_DMA);
	if (buf->begin) {
		buf->data = &buf->begin[pos];
		buf->end = &buf->begin[size];
		return 0;
	} else {
		buf->end = buf->data = buf->begin;
		return -ENOMEM;
	}
}