summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/marvell/mwifiex/usb.c
blob: cb1753e43ef4a0734dc79b6d4b15e64fff5b0c23 (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
/*
 * Marvell Wireless LAN device driver: USB specific handling
 *
 * Copyright (C) 2012-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "main.h"
#include "usb.h"

#define USB_VERSION	"1.0"

static struct mwifiex_if_ops usb_ops;

static struct usb_device_id mwifiex_usb_table[] = {
	/* 8766 */
	{USB_DEVICE(USB8XXX_VID, USB8766_PID_1)},
	{USB_DEVICE_AND_INTERFACE_INFO(USB8XXX_VID, USB8766_PID_2,
				       USB_CLASS_VENDOR_SPEC,
				       USB_SUBCLASS_VENDOR_SPEC, 0xff)},
	/* 8797 */
	{USB_DEVICE(USB8XXX_VID, USB8797_PID_1)},
	{USB_DEVICE_AND_INTERFACE_INFO(USB8XXX_VID, USB8797_PID_2,
				       USB_CLASS_VENDOR_SPEC,
				       USB_SUBCLASS_VENDOR_SPEC, 0xff)},
	/* 8801 */
	{USB_DEVICE(USB8XXX_VID, USB8801_PID_1)},
	{USB_DEVICE_AND_INTERFACE_INFO(USB8XXX_VID, USB8801_PID_2,
				       USB_CLASS_VENDOR_SPEC,
				       USB_SUBCLASS_VENDOR_SPEC, 0xff)},
	/* 8997 */
	{USB_DEVICE(USB8XXX_VID, USB8997_PID_1)},
	{USB_DEVICE_AND_INTERFACE_INFO(USB8XXX_VID, USB8997_PID_2,
				       USB_CLASS_VENDOR_SPEC,
				       USB_SUBCLASS_VENDOR_SPEC, 0xff)},
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, mwifiex_usb_table);

static int mwifiex_usb_submit_rx_urb(struct urb_context *ctx, int size);

/* This function handles received packet. Necessary action is taken based on
 * cmd/event/data.
 */
static int mwifiex_usb_recv(struct mwifiex_adapter *adapter,
			    struct sk_buff *skb, u8 ep)
{
	u32 recv_type;
	__le32 tmp;
	int ret;

	if (adapter->hs_activated)
		mwifiex_process_hs_config(adapter);

	if (skb->len < INTF_HEADER_LEN) {
		mwifiex_dbg(adapter, ERROR,
			    "%s: invalid skb->len\n", __func__);
		return -1;
	}

	switch (ep) {
	case MWIFIEX_USB_EP_CMD_EVENT:
		mwifiex_dbg(adapter, EVENT,
			    "%s: EP_CMD_EVENT\n", __func__);
		skb_copy_from_linear_data(skb, &tmp, INTF_HEADER_LEN);
		recv_type = le32_to_cpu(tmp);
		skb_pull(skb, INTF_HEADER_LEN);

		switch (recv_type) {
		case MWIFIEX_USB_TYPE_CMD:
			if (skb->len > MWIFIEX_SIZE_OF_CMD_BUFFER) {
				mwifiex_dbg(adapter, ERROR,
					    "CMD: skb->len too large\n");
				ret = -1;
				goto exit_restore_skb;
			} else if (!adapter->curr_cmd) {
				mwifiex_dbg(adapter, WARN, "CMD: no curr_cmd\n");
				if (adapter->ps_state == PS_STATE_SLEEP_CFM) {
					mwifiex_process_sleep_confirm_resp(
							adapter, skb->data,
							skb->len);
					ret = 0;
					goto exit_restore_skb;
				}
				ret = -1;
				goto exit_restore_skb;
			}

			adapter->curr_cmd->resp_skb = skb;
			adapter->cmd_resp_received = true;
			break;
		case MWIFIEX_USB_TYPE_EVENT:
			if (skb->len < sizeof(u32)) {
				mwifiex_dbg(adapter, ERROR,
					    "EVENT: skb->len too small\n");
				ret = -1;
				goto exit_restore_skb;
			}
			skb_copy_from_linear_data(skb, &tmp, sizeof(u32));
			adapter->event_cause = le32_to_cpu(tmp);
			mwifiex_dbg(adapter, EVENT,
				    "event_cause %#x\n", adapter->event_cause);

			if (skb->len > MAX_EVENT_SIZE) {
				mwifiex_dbg(adapter, ERROR,
					    "EVENT: event body too large\n");
				ret = -1;
				goto exit_restore_skb;
			}

			memcpy(adapter->event_body, skb->data +
			       MWIFIEX_EVENT_HEADER_LEN, skb->len);

			adapter->event_received = true;
			adapter->event_skb = skb;
			break;
		default:
			mwifiex_dbg(adapter, ERROR,
				    "unknown recv_type %#x\n", recv_type);
			return -1;
		}
		break;
	case MWIFIEX_USB_EP_DATA:
		mwifiex_dbg(adapter, DATA, "%s: EP_DATA\n", __func__);
		if (skb->len > MWIFIEX_RX_DATA_BUF_SIZE) {
			mwifiex_dbg(adapter, ERROR,
				    "DATA: skb->len too large\n");
			return -1;
		}

		skb_queue_tail(&adapter->rx_data_q, skb);
		adapter->data_received = true;
		atomic_inc(&adapter->rx_pending);
		break;
	default:
		mwifiex_dbg(adapter, ERROR,
			    "%s: unknown endport %#x\n", __func__, ep);
		return -1;
	}

	return -EINPROGRESS;

exit_restore_skb:
	/* The buffer will be reused for further cmds/events */
	skb_push(skb, INTF_HEADER_LEN);

	return ret;
}

static void mwifiex_usb_rx_complete(struct urb *urb)
{
	struct urb_context *context = (struct urb_context *)urb->context;
	struct mwifiex_adapter *adapter = context->adapter;
	struct sk_buff *skb = context->skb;
	struct usb_card_rec *card;
	int recv_length = urb->actual_length;
	int size, status;

	if (!adapter || !adapter->card) {
		pr_err("mwifiex adapter or card structure is not valid\n");
		return;
	}

	card = (struct usb_card_rec *)adapter->card;
	if (card->rx_cmd_ep == context->ep)
		atomic_dec(&card->rx_cmd_urb_pending);
	else
		atomic_dec(&card->rx_data_urb_pending);

	if (recv_length) {
		if (urb->status || (adapter->surprise_removed)) {
			mwifiex_dbg(adapter, ERROR,
				    "URB status is failed: %d\n", urb->status);
			/* Do not free skb in case of command ep */
			if (card->rx_cmd_ep != context->ep)
				dev_kfree_skb_any(skb);
			goto setup_for_next;
		}
		if (skb->len > recv_length)
			skb_trim(skb, recv_length);
		else
			skb_put(skb, recv_length - skb->len);

		status = mwifiex_usb_recv(adapter, skb, context->ep);

		mwifiex_dbg(adapter, INFO,
			    "info: recv_length=%d, status=%d\n",
			    recv_length, status);
		if (status == -EINPROGRESS) {
			mwifiex_queue_main_work(adapter);

			/* urb for data_ep is re-submitted now;
			 * urb for cmd_ep will be re-submitted in callback
			 * mwifiex_usb_recv_complete
			 */
			if (card->rx_cmd_ep == context->ep)
				return;
		} else {
			if (status == -1)
				mwifiex_dbg(adapter, ERROR,
					    "received data processing failed!\n");

			/* Do not free skb in case of command ep */
			if (card->rx_cmd_ep != context->ep)
				dev_kfree_skb_any(skb);
		}
	} else if (urb->status) {
		if (!adapter->is_suspended) {
			mwifiex_dbg(adapter, FATAL,
				    "Card is removed: %d\n", urb->status);
			adapter->surprise_removed = true;
		}
		dev_kfree_skb_any(skb);
		return;
	} else {
		/* Do not free skb in case of command ep */
		if (card->rx_cmd_ep != context->ep)
			dev_kfree_skb_any(skb);

		/* fall through setup_for_next */
	}

setup_for_next:
	if (card->rx_cmd_ep == context->ep)
		size = MWIFIEX_RX_CMD_BUF_SIZE;
	else
		size = MWIFIEX_RX_DATA_BUF_SIZE;

	if (card->rx_cmd_ep == context->ep) {
		mwifiex_usb_submit_rx_urb(context, size);
	} else {
		if (atomic_read(&adapter->rx_pending) <= HIGH_RX_PENDING) {
			mwifiex_usb_submit_rx_urb(context, size);
		} else {
			context->skb = NULL;
		}
	}

	return;
}

static void mwifiex_usb_tx_complete(struct urb *urb)
{
	struct urb_context *context = (struct urb_context *)(urb->context);
	struct mwifiex_adapter *adapter = context->adapter;
	struct usb_card_rec *card = adapter->card;
	struct usb_tx_data_port *port;
	int i;

	mwifiex_dbg(adapter, INFO,
		    "%s: status: %d\n", __func__, urb->status);

	if (context->ep == card->tx_cmd_ep) {
		mwifiex_dbg(adapter, CMD,
			    "%s: CMD\n", __func__);
		atomic_dec(&card->tx_cmd_urb_pending);
		adapter->cmd_sent = false;
	} else {
		mwifiex_dbg(adapter, DATA,
			    "%s: DATA\n", __func__);
		mwifiex_write_data_complete(adapter, context->skb, 0,
					    urb->status ? -1 : 0);
		for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
			port = &card->port[i];
			if (context->ep == port->tx_data_ep) {
				atomic_dec(&port->tx_data_urb_pending);
				port->block_status = false;
				break;
			}
		}
		adapter->data_sent = false;
	}

	if (card->mc_resync_flag)
		mwifiex_multi_chan_resync(adapter);

	mwifiex_queue_main_work(adapter);

	return;
}

static int mwifiex_usb_submit_rx_urb(struct urb_context *ctx, int size)
{
	struct mwifiex_adapter *adapter = ctx->adapter;
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;

	if (card->rx_cmd_ep != ctx->ep) {
		ctx->skb = dev_alloc_skb(size);
		if (!ctx->skb) {
			mwifiex_dbg(adapter, ERROR,
				    "%s: dev_alloc_skb failed\n", __func__);
			return -ENOMEM;
		}
	}

	if (card->rx_cmd_ep == ctx->ep &&
	    card->rx_cmd_ep_type == USB_ENDPOINT_XFER_INT)
		usb_fill_int_urb(ctx->urb, card->udev,
				 usb_rcvintpipe(card->udev, ctx->ep),
				 ctx->skb->data, size, mwifiex_usb_rx_complete,
				 (void *)ctx, card->rx_cmd_interval);
	else
		usb_fill_bulk_urb(ctx->urb, card->udev,
				  usb_rcvbulkpipe(card->udev, ctx->ep),
				  ctx->skb->data, size, mwifiex_usb_rx_complete,
				  (void *)ctx);

	if (card->rx_cmd_ep == ctx->ep)
		atomic_inc(&card->rx_cmd_urb_pending);
	else
		atomic_inc(&card->rx_data_urb_pending);

	if (usb_submit_urb(ctx->urb, GFP_ATOMIC)) {
		mwifiex_dbg(adapter, ERROR, "usb_submit_urb failed\n");
		dev_kfree_skb_any(ctx->skb);
		ctx->skb = NULL;

		if (card->rx_cmd_ep == ctx->ep)
			atomic_dec(&card->rx_cmd_urb_pending);
		else
			atomic_dec(&card->rx_data_urb_pending);

		return -1;
	}

	return 0;
}

static void mwifiex_usb_free(struct usb_card_rec *card)
{
	struct usb_tx_data_port *port;
	int i, j;

	if (atomic_read(&card->rx_cmd_urb_pending) && card->rx_cmd.urb)
		usb_kill_urb(card->rx_cmd.urb);

	usb_free_urb(card->rx_cmd.urb);
	card->rx_cmd.urb = NULL;

	if (atomic_read(&card->rx_data_urb_pending))
		for (i = 0; i < MWIFIEX_RX_DATA_URB; i++)
			if (card->rx_data_list[i].urb)
				usb_kill_urb(card->rx_data_list[i].urb);

	for (i = 0; i < MWIFIEX_RX_DATA_URB; i++) {
		usb_free_urb(card->rx_data_list[i].urb);
		card->rx_data_list[i].urb = NULL;
	}

	for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
		port = &card->port[i];
		for (j = 0; j < MWIFIEX_TX_DATA_URB; j++) {
			usb_kill_urb(port->tx_data_list[j].urb);
			usb_free_urb(port->tx_data_list[j].urb);
			port->tx_data_list[j].urb = NULL;
		}
	}

	usb_free_urb(card->tx_cmd.urb);
	card->tx_cmd.urb = NULL;

	return;
}

/* This function probes an mwifiex device and registers it. It allocates
 * the card structure, initiates the device registration and initialization
 * procedure by adding a logical interface.
 */
static int mwifiex_usb_probe(struct usb_interface *intf,
			     const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_host_interface *iface_desc = intf->cur_altsetting;
	struct usb_endpoint_descriptor *epd;
	int ret, i;
	struct usb_card_rec *card;
	u16 id_vendor, id_product, bcd_device;

	card = devm_kzalloc(&intf->dev, sizeof(*card), GFP_KERNEL);
	if (!card)
		return -ENOMEM;

	init_completion(&card->fw_done);

	id_vendor = le16_to_cpu(udev->descriptor.idVendor);
	id_product = le16_to_cpu(udev->descriptor.idProduct);
	bcd_device = le16_to_cpu(udev->descriptor.bcdDevice);
	pr_debug("info: VID/PID = %X/%X, Boot2 version = %X\n",
		 id_vendor, id_product, bcd_device);

	/* PID_1 is used for firmware downloading only */
	switch (id_product) {
	case USB8766_PID_1:
	case USB8797_PID_1:
	case USB8801_PID_1:
	case USB8997_PID_1:
		card->usb_boot_state = USB8XXX_FW_DNLD;
		break;
	case USB8766_PID_2:
	case USB8797_PID_2:
	case USB8801_PID_2:
	case USB8997_PID_2:
		card->usb_boot_state = USB8XXX_FW_READY;
		break;
	default:
		pr_warn("unknown id_product %#x\n", id_product);
		card->usb_boot_state = USB8XXX_FW_DNLD;
		break;
	}

	card->udev = udev;
	card->intf = intf;

	pr_debug("info: bcdUSB=%#x Device Class=%#x SubClass=%#x Protocol=%#x\n",
		 le16_to_cpu(udev->descriptor.bcdUSB),
		 udev->descriptor.bDeviceClass,
		 udev->descriptor.bDeviceSubClass,
		 udev->descriptor.bDeviceProtocol);

	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		epd = &iface_desc->endpoint[i].desc;
		if (usb_endpoint_dir_in(epd) &&
		    usb_endpoint_num(epd) == MWIFIEX_USB_EP_CMD_EVENT &&
		    (usb_endpoint_xfer_bulk(epd) ||
		     usb_endpoint_xfer_int(epd))) {
			card->rx_cmd_ep_type = usb_endpoint_type(epd);
			card->rx_cmd_interval = epd->bInterval;
			pr_debug("info: Rx CMD/EVT:: max pkt size: %d, addr: %d, ep_type: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress, card->rx_cmd_ep_type);
			card->rx_cmd_ep = usb_endpoint_num(epd);
			atomic_set(&card->rx_cmd_urb_pending, 0);
		}
		if (usb_endpoint_dir_in(epd) &&
		    usb_endpoint_num(epd) == MWIFIEX_USB_EP_DATA &&
		    usb_endpoint_xfer_bulk(epd)) {
			pr_debug("info: bulk IN: max pkt size: %d, addr: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress);
			card->rx_data_ep = usb_endpoint_num(epd);
			atomic_set(&card->rx_data_urb_pending, 0);
		}
		if (usb_endpoint_dir_out(epd) &&
		    usb_endpoint_num(epd) == MWIFIEX_USB_EP_DATA &&
		    usb_endpoint_xfer_bulk(epd)) {
			pr_debug("info: bulk OUT: max pkt size: %d, addr: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress);
			card->port[0].tx_data_ep = usb_endpoint_num(epd);
			atomic_set(&card->port[0].tx_data_urb_pending, 0);
		}
		if (usb_endpoint_dir_out(epd) &&
		    usb_endpoint_num(epd) == MWIFIEX_USB_EP_DATA_CH2 &&
		    usb_endpoint_xfer_bulk(epd)) {
			pr_debug("info: bulk OUT chan2:\t"
				 "max pkt size: %d, addr: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress);
			card->port[1].tx_data_ep = usb_endpoint_num(epd);
			atomic_set(&card->port[1].tx_data_urb_pending, 0);
		}
		if (usb_endpoint_dir_out(epd) &&
		    usb_endpoint_num(epd) == MWIFIEX_USB_EP_CMD_EVENT &&
		    (usb_endpoint_xfer_bulk(epd) ||
		     usb_endpoint_xfer_int(epd))) {
			card->tx_cmd_ep_type = usb_endpoint_type(epd);
			card->tx_cmd_interval = epd->bInterval;
			pr_debug("info: bulk OUT: max pkt size: %d, addr: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress);
			pr_debug("info: Tx CMD:: max pkt size: %d, addr: %d, ep_type: %d\n",
				 le16_to_cpu(epd->wMaxPacketSize),
				 epd->bEndpointAddress, card->tx_cmd_ep_type);
			card->tx_cmd_ep = usb_endpoint_num(epd);
			atomic_set(&card->tx_cmd_urb_pending, 0);
			card->bulk_out_maxpktsize =
					le16_to_cpu(epd->wMaxPacketSize);
		}
	}

	usb_set_intfdata(intf, card);

	ret = mwifiex_add_card(card, &card->fw_done, &usb_ops,
			       MWIFIEX_USB, &card->udev->dev);
	if (ret) {
		pr_err("%s: mwifiex_add_card failed: %d\n", __func__, ret);
		usb_reset_device(udev);
		return ret;
	}

	usb_get_dev(udev);

	return 0;
}

/* Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not suspended, this function allocates and sends a
 * 'host sleep activate' request to the firmware and turns off the traffic.
 */
static int mwifiex_usb_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct usb_card_rec *card = usb_get_intfdata(intf);
	struct mwifiex_adapter *adapter;
	struct usb_tx_data_port *port;
	int i, j;

	/* Might still be loading firmware */
	wait_for_completion(&card->fw_done);

	adapter = card->adapter;
	if (!adapter) {
		dev_err(&intf->dev, "card is not valid\n");
		return 0;
	}

	if (unlikely(adapter->is_suspended))
		mwifiex_dbg(adapter, WARN,
			    "Device already suspended\n");

	/* Enable the Host Sleep */
	if (!mwifiex_enable_hs(adapter)) {
		mwifiex_dbg(adapter, ERROR,
			    "cmd: failed to suspend\n");
		adapter->hs_enabling = false;
		return -EFAULT;
	}


	/* 'is_suspended' flag indicates device is suspended.
	 * It must be set here before the usb_kill_urb() calls. Reason
	 * is in the complete handlers, urb->status(= -ENOENT) and
	 * this flag is used in combination to distinguish between a
	 * 'suspended' state and a 'disconnect' one.
	 */
	adapter->is_suspended = true;
	adapter->hs_enabling = false;

	if (atomic_read(&card->rx_cmd_urb_pending) && card->rx_cmd.urb)
		usb_kill_urb(card->rx_cmd.urb);

	if (atomic_read(&card->rx_data_urb_pending))
		for (i = 0; i < MWIFIEX_RX_DATA_URB; i++)
			if (card->rx_data_list[i].urb)
				usb_kill_urb(card->rx_data_list[i].urb);

	for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
		port = &card->port[i];
		for (j = 0; j < MWIFIEX_TX_DATA_URB; j++) {
			if (port->tx_data_list[j].urb)
				usb_kill_urb(port->tx_data_list[j].urb);
		}
	}

	if (card->tx_cmd.urb)
		usb_kill_urb(card->tx_cmd.urb);

	return 0;
}

/* Kernel needs to suspend all functions separately. Therefore all
 * registered functions must have drivers with suspend and resume
 * methods. Failing that the kernel simply removes the whole card.
 *
 * If already not resumed, this function turns on the traffic and
 * sends a 'host sleep cancel' request to the firmware.
 */
static int mwifiex_usb_resume(struct usb_interface *intf)
{
	struct usb_card_rec *card = usb_get_intfdata(intf);
	struct mwifiex_adapter *adapter;
	int i;

	if (!card->adapter) {
		dev_err(&intf->dev, "%s: card->adapter is NULL\n",
			__func__);
		return 0;
	}
	adapter = card->adapter;

	if (unlikely(!adapter->is_suspended)) {
		mwifiex_dbg(adapter, WARN,
			    "Device already resumed\n");
		return 0;
	}

	/* Indicate device resumed. The netdev queue will be resumed only
	 * after the urbs have been re-submitted
	 */
	adapter->is_suspended = false;

	if (!atomic_read(&card->rx_data_urb_pending))
		for (i = 0; i < MWIFIEX_RX_DATA_URB; i++)
			mwifiex_usb_submit_rx_urb(&card->rx_data_list[i],
						  MWIFIEX_RX_DATA_BUF_SIZE);

	if (!atomic_read(&card->rx_cmd_urb_pending)) {
		card->rx_cmd.skb = dev_alloc_skb(MWIFIEX_RX_CMD_BUF_SIZE);
		if (card->rx_cmd.skb)
			mwifiex_usb_submit_rx_urb(&card->rx_cmd,
						  MWIFIEX_RX_CMD_BUF_SIZE);
	}

	/* Disable Host Sleep */
	if (adapter->hs_activated)
		mwifiex_cancel_hs(mwifiex_get_priv(adapter,
						   MWIFIEX_BSS_ROLE_ANY),
				  MWIFIEX_ASYNC_CMD);

	return 0;
}

static void mwifiex_usb_disconnect(struct usb_interface *intf)
{
	struct usb_card_rec *card = usb_get_intfdata(intf);
	struct mwifiex_adapter *adapter;

	wait_for_completion(&card->fw_done);

	adapter = card->adapter;
	if (!adapter || !adapter->priv_num)
		return;

	if (card->udev->state != USB_STATE_NOTATTACHED && !adapter->mfg_mode) {
		mwifiex_deauthenticate_all(adapter);

		mwifiex_init_shutdown_fw(mwifiex_get_priv(adapter,
							  MWIFIEX_BSS_ROLE_ANY),
					 MWIFIEX_FUNC_SHUTDOWN);
	}

	mwifiex_usb_free(card);

	mwifiex_dbg(adapter, FATAL,
		    "%s: removing card\n", __func__);
	mwifiex_remove_card(adapter);

	usb_put_dev(interface_to_usbdev(intf));
}

static struct usb_driver mwifiex_usb_driver = {
	.name = "mwifiex_usb",
	.probe = mwifiex_usb_probe,
	.disconnect = mwifiex_usb_disconnect,
	.id_table = mwifiex_usb_table,
	.suspend = mwifiex_usb_suspend,
	.resume = mwifiex_usb_resume,
	.soft_unbind = 1,
};

static int mwifiex_write_data_sync(struct mwifiex_adapter *adapter, u8 *pbuf,
				   u32 *len, u8 ep, u32 timeout)
{
	struct usb_card_rec *card = adapter->card;
	int actual_length, ret;

	if (!(*len % card->bulk_out_maxpktsize))
		(*len)++;

	/* Send the data block */
	ret = usb_bulk_msg(card->udev, usb_sndbulkpipe(card->udev, ep), pbuf,
			   *len, &actual_length, timeout);
	if (ret) {
		mwifiex_dbg(adapter, ERROR,
			    "usb_bulk_msg for tx failed: %d\n", ret);
		return ret;
	}

	*len = actual_length;

	return ret;
}

static int mwifiex_read_data_sync(struct mwifiex_adapter *adapter, u8 *pbuf,
				  u32 *len, u8 ep, u32 timeout)
{
	struct usb_card_rec *card = adapter->card;
	int actual_length, ret;

	/* Receive the data response */
	ret = usb_bulk_msg(card->udev, usb_rcvbulkpipe(card->udev, ep), pbuf,
			   *len, &actual_length, timeout);
	if (ret) {
		mwifiex_dbg(adapter, ERROR,
			    "usb_bulk_msg for rx failed: %d\n", ret);
		return ret;
	}

	*len = actual_length;

	return ret;
}

static void mwifiex_usb_port_resync(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = adapter->card;
	u8 active_port = MWIFIEX_USB_EP_DATA;
	struct mwifiex_private *priv = NULL;
	int i;

	if (adapter->usb_mc_status) {
		for (i = 0; i < adapter->priv_num; i++) {
			priv = adapter->priv[i];
			if (!priv)
				continue;
			if ((priv->bss_role == MWIFIEX_BSS_ROLE_UAP &&
			     !priv->bss_started) ||
			    (priv->bss_role == MWIFIEX_BSS_ROLE_STA &&
			     !priv->media_connected))
				priv->usb_port = MWIFIEX_USB_EP_DATA;
		}
		for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++)
			card->port[i].block_status = false;
	} else {
		for (i = 0; i < adapter->priv_num; i++) {
			priv = adapter->priv[i];
			if (!priv)
				continue;
			if ((priv->bss_role == MWIFIEX_BSS_ROLE_UAP &&
			     priv->bss_started) ||
			    (priv->bss_role == MWIFIEX_BSS_ROLE_STA &&
			     priv->media_connected)) {
				active_port = priv->usb_port;
				break;
			}
		}
		for (i = 0; i < adapter->priv_num; i++) {
			priv = adapter->priv[i];
			if (priv)
				priv->usb_port = active_port;
		}
		for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
			if (active_port == card->port[i].tx_data_ep)
				card->port[i].block_status = false;
			else
				card->port[i].block_status = true;
		}
	}
}

static bool mwifiex_usb_is_port_ready(struct mwifiex_private *priv)
{
	struct usb_card_rec *card = priv->adapter->card;
	int idx;

	for (idx = 0; idx < MWIFIEX_TX_DATA_PORT; idx++) {
		if (priv->usb_port == card->port[idx].tx_data_ep)
			return !card->port[idx].block_status;
	}

	return false;
}

static inline u8 mwifiex_usb_data_sent(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = adapter->card;
	int i;

	for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++)
		if (!card->port[i].block_status)
			return false;

	return true;
}

static int mwifiex_usb_construct_send_urb(struct mwifiex_adapter *adapter,
					  struct usb_tx_data_port *port, u8 ep,
					  struct urb_context *context,
					  struct sk_buff *skb_send)
{
	struct usb_card_rec *card = adapter->card;
	int ret = -EINPROGRESS;
	struct urb *tx_urb;

	context->adapter = adapter;
	context->ep = ep;
	context->skb = skb_send;
	tx_urb = context->urb;

	if (ep == card->tx_cmd_ep &&
	    card->tx_cmd_ep_type == USB_ENDPOINT_XFER_INT)
		usb_fill_int_urb(tx_urb, card->udev,
				 usb_sndintpipe(card->udev, ep), skb_send->data,
				 skb_send->len, mwifiex_usb_tx_complete,
				 (void *)context, card->tx_cmd_interval);
	else
		usb_fill_bulk_urb(tx_urb, card->udev,
				  usb_sndbulkpipe(card->udev, ep),
				  skb_send->data, skb_send->len,
				  mwifiex_usb_tx_complete, (void *)context);

	tx_urb->transfer_flags |= URB_ZERO_PACKET;

	if (ep == card->tx_cmd_ep)
		atomic_inc(&card->tx_cmd_urb_pending);
	else
		atomic_inc(&port->tx_data_urb_pending);

	if (ep != card->tx_cmd_ep &&
	    atomic_read(&port->tx_data_urb_pending) ==
					MWIFIEX_TX_DATA_URB) {
		port->block_status = true;
		adapter->data_sent = mwifiex_usb_data_sent(adapter);
		ret = -ENOSR;
	}

	if (usb_submit_urb(tx_urb, GFP_ATOMIC)) {
		mwifiex_dbg(adapter, ERROR,
			    "%s: usb_submit_urb failed\n", __func__);
		if (ep == card->tx_cmd_ep) {
			atomic_dec(&card->tx_cmd_urb_pending);
		} else {
			atomic_dec(&port->tx_data_urb_pending);
			port->block_status = false;
			adapter->data_sent = false;
			if (port->tx_data_ix)
				port->tx_data_ix--;
			else
				port->tx_data_ix = MWIFIEX_TX_DATA_URB;
		}
		ret = -1;
	}

	return ret;
}

static int mwifiex_usb_prepare_tx_aggr_skb(struct mwifiex_adapter *adapter,
					   struct usb_tx_data_port *port,
					   struct sk_buff **skb_send)
{
	struct sk_buff *skb_aggr, *skb_tmp;
	u8 *payload, pad;
	u16 align = adapter->bus_aggr.tx_aggr_align;
	struct mwifiex_txinfo *tx_info = NULL;
	bool is_txinfo_set = false;

	/* Packets in aggr_list will be send in either skb_aggr or
	 * write complete, delete the tx_aggr timer
	 */
	if (port->tx_aggr.timer_cnxt.is_hold_timer_set) {
		del_timer(&port->tx_aggr.timer_cnxt.hold_timer);
		port->tx_aggr.timer_cnxt.is_hold_timer_set = false;
		port->tx_aggr.timer_cnxt.hold_tmo_msecs = 0;
	}

	skb_aggr = mwifiex_alloc_dma_align_buf(port->tx_aggr.aggr_len,
					       GFP_ATOMIC);
	if (!skb_aggr) {
		mwifiex_dbg(adapter, ERROR,
			    "%s: alloc skb_aggr failed\n", __func__);

		while ((skb_tmp = skb_dequeue(&port->tx_aggr.aggr_list)))
			mwifiex_write_data_complete(adapter, skb_tmp, 0, -1);

		port->tx_aggr.aggr_num = 0;
		port->tx_aggr.aggr_len = 0;
		return -EBUSY;
	}

	tx_info = MWIFIEX_SKB_TXCB(skb_aggr);
	memset(tx_info, 0, sizeof(*tx_info));

	while ((skb_tmp = skb_dequeue(&port->tx_aggr.aggr_list))) {
		/* padding for aligning next packet header*/
		pad = (align - (skb_tmp->len & (align - 1))) % align;
		payload = skb_put(skb_aggr, skb_tmp->len + pad);
		memcpy(payload, skb_tmp->data, skb_tmp->len);
		if (skb_queue_empty(&port->tx_aggr.aggr_list)) {
			/* do not padding for last packet*/
			*(u16 *)payload = cpu_to_le16(skb_tmp->len);
			*(u16 *)&payload[2] =
				cpu_to_le16(MWIFIEX_TYPE_AGGR_DATA_V2 | 0x80);
			skb_trim(skb_aggr, skb_aggr->len - pad);
		} else {
			/* add aggregation interface header */
			*(u16 *)payload = cpu_to_le16(skb_tmp->len + pad);
			*(u16 *)&payload[2] =
				cpu_to_le16(MWIFIEX_TYPE_AGGR_DATA_V2);
		}

		if (!is_txinfo_set) {
			tx_info->bss_num = MWIFIEX_SKB_TXCB(skb_tmp)->bss_num;
			tx_info->bss_type = MWIFIEX_SKB_TXCB(skb_tmp)->bss_type;
			is_txinfo_set = true;
		}

		port->tx_aggr.aggr_num--;
		port->tx_aggr.aggr_len -= (skb_tmp->len + pad);
		mwifiex_write_data_complete(adapter, skb_tmp, 0, 0);
	}

	tx_info->pkt_len = skb_aggr->len -
			(sizeof(struct txpd) + adapter->intf_hdr_len);
	tx_info->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;

	port->tx_aggr.aggr_num = 0;
	port->tx_aggr.aggr_len = 0;
	*skb_send = skb_aggr;

	return 0;
}

/* This function prepare data packet to be send under usb tx aggregation
 * protocol, check current usb aggregation status, link packet to aggrgation
 * list if possible, work flow as below:
 * (1) if only 1 packet available, add usb tx aggregation header and send.
 * (2) if packet is able to aggregated, link it to current aggregation list.
 * (3) if packet is not able to aggregated, aggregate and send exist packets
 *     in aggrgation list. Then, link packet in the list if there is more
 *     packet in transmit queue, otherwise try to transmit single packet.
 */
static int mwifiex_usb_aggr_tx_data(struct mwifiex_adapter *adapter, u8 ep,
				    struct sk_buff *skb,
				    struct mwifiex_tx_param *tx_param,
				    struct usb_tx_data_port *port)
{
	u8 *payload, pad;
	u16 align = adapter->bus_aggr.tx_aggr_align;
	struct sk_buff *skb_send = NULL;
	struct urb_context *context = NULL;
	struct txpd *local_tx_pd =
		(struct txpd *)((u8 *)skb->data + adapter->intf_hdr_len);
	u8 f_send_aggr_buf = 0;
	u8 f_send_cur_buf = 0;
	u8 f_precopy_cur_buf = 0;
	u8 f_postcopy_cur_buf = 0;
	u32 timeout;
	int ret;

	/* padding to ensure each packet alginment */
	pad = (align - (skb->len & (align - 1))) % align;

	if (tx_param && tx_param->next_pkt_len) {
		/* next packet available in tx queue*/
		if (port->tx_aggr.aggr_len + skb->len + pad >
		    adapter->bus_aggr.tx_aggr_max_size) {
			f_send_aggr_buf = 1;
			f_postcopy_cur_buf = 1;
		} else {
			/* current packet could be aggregated*/
			f_precopy_cur_buf = 1;

			if (port->tx_aggr.aggr_len + skb->len + pad +
			    tx_param->next_pkt_len >
			    adapter->bus_aggr.tx_aggr_max_size ||
			    port->tx_aggr.aggr_num + 2 >
			    adapter->bus_aggr.tx_aggr_max_num) {
			    /* next packet could not be aggregated
			     * send current aggregation buffer
			     */
				f_send_aggr_buf = 1;
			}
		}
	} else {
		/* last packet in tx queue */
		if (port->tx_aggr.aggr_num > 0) {
			/* pending packets in aggregation buffer*/
			if (port->tx_aggr.aggr_len + skb->len + pad >
			    adapter->bus_aggr.tx_aggr_max_size) {
				/* current packet not be able to aggregated,
				 * send aggr buffer first, then send packet.
				 */
				f_send_cur_buf = 1;
			} else {
				/* last packet, Aggregation and send */
				f_precopy_cur_buf = 1;
			}

			f_send_aggr_buf = 1;
		} else {
			/* no pending packets in aggregation buffer,
			 * send current packet immediately
			 */
			 f_send_cur_buf = 1;
		}
	}

	if (local_tx_pd->flags & MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET) {
		/* Send NULL packet immediately*/
		if (f_precopy_cur_buf) {
			if (skb_queue_empty(&port->tx_aggr.aggr_list)) {
				f_precopy_cur_buf = 0;
				f_send_aggr_buf = 0;
				f_send_cur_buf = 1;
			} else {
				f_send_aggr_buf = 1;
			}
		} else if (f_postcopy_cur_buf) {
			f_send_cur_buf = 1;
			f_postcopy_cur_buf = 0;
		}
	}

	if (f_precopy_cur_buf) {
		skb_queue_tail(&port->tx_aggr.aggr_list, skb);
		port->tx_aggr.aggr_len += (skb->len + pad);
		port->tx_aggr.aggr_num++;
		if (f_send_aggr_buf)
			goto send_aggr_buf;

		/* packet will not been send immediately,
		 * set a timer to make sure it will be sent under
		 * strict time limit. Dynamically fit the timeout
		 * value, according to packets number in aggr_list
		 */
		if (!port->tx_aggr.timer_cnxt.is_hold_timer_set) {
			port->tx_aggr.timer_cnxt.hold_tmo_msecs =
					MWIFIEX_USB_TX_AGGR_TMO_MIN;
			timeout =
				port->tx_aggr.timer_cnxt.hold_tmo_msecs;
			mod_timer(&port->tx_aggr.timer_cnxt.hold_timer,
				  jiffies + msecs_to_jiffies(timeout));
			port->tx_aggr.timer_cnxt.is_hold_timer_set = true;
		} else {
			if (port->tx_aggr.timer_cnxt.hold_tmo_msecs <
			    MWIFIEX_USB_TX_AGGR_TMO_MAX) {
				/* Dyanmic fit timeout */
				timeout =
				++port->tx_aggr.timer_cnxt.hold_tmo_msecs;
				mod_timer(&port->tx_aggr.timer_cnxt.hold_timer,
					  jiffies + msecs_to_jiffies(timeout));
			}
		}
	}

send_aggr_buf:
	if (f_send_aggr_buf) {
		ret = mwifiex_usb_prepare_tx_aggr_skb(adapter, port, &skb_send);
		if (!ret) {
			context = &port->tx_data_list[port->tx_data_ix++];
			ret = mwifiex_usb_construct_send_urb(adapter, port, ep,
							     context, skb_send);
			if (ret == -1)
				mwifiex_write_data_complete(adapter, skb_send,
							    0, -1);
		}
	}

	if (f_send_cur_buf) {
		if (f_send_aggr_buf) {
			if (atomic_read(&port->tx_data_urb_pending) >=
			    MWIFIEX_TX_DATA_URB) {
				port->block_status = true;
				adapter->data_sent =
					mwifiex_usb_data_sent(adapter);
				/* no available urb, postcopy packet*/
				f_postcopy_cur_buf = 1;
				goto postcopy_cur_buf;
			}

			if (port->tx_data_ix >= MWIFIEX_TX_DATA_URB)
				port->tx_data_ix = 0;
		}

		payload = skb->data;
		*(u16 *)&payload[2] =
			cpu_to_le16(MWIFIEX_TYPE_AGGR_DATA_V2 | 0x80);
		*(u16 *)payload = cpu_to_le16(skb->len);
		skb_send = skb;
		context = &port->tx_data_list[port->tx_data_ix++];
		return mwifiex_usb_construct_send_urb(adapter, port, ep,
						      context, skb_send);
	}

postcopy_cur_buf:
	if (f_postcopy_cur_buf) {
		skb_queue_tail(&port->tx_aggr.aggr_list, skb);
		port->tx_aggr.aggr_len += (skb->len + pad);
		port->tx_aggr.aggr_num++;
		/* New aggregation begin, start timer */
		if (!port->tx_aggr.timer_cnxt.is_hold_timer_set) {
			port->tx_aggr.timer_cnxt.hold_tmo_msecs =
					MWIFIEX_USB_TX_AGGR_TMO_MIN;
			timeout = port->tx_aggr.timer_cnxt.hold_tmo_msecs;
			mod_timer(&port->tx_aggr.timer_cnxt.hold_timer,
				  jiffies + msecs_to_jiffies(timeout));
			port->tx_aggr.timer_cnxt.is_hold_timer_set = true;
		}
	}

	return -EINPROGRESS;
}

static void mwifiex_usb_tx_aggr_tmo(unsigned long context)
{
	struct urb_context *urb_cnxt = NULL;
	struct sk_buff *skb_send = NULL;
	struct tx_aggr_tmr_cnxt *timer_context =
		(struct tx_aggr_tmr_cnxt *)context;
	struct mwifiex_adapter *adapter = timer_context->adapter;
	struct usb_tx_data_port *port = timer_context->port;
	unsigned long flags;
	int err = 0;

	spin_lock_irqsave(&port->tx_aggr_lock, flags);
	err = mwifiex_usb_prepare_tx_aggr_skb(adapter, port, &skb_send);
	if (err) {
		mwifiex_dbg(adapter, ERROR,
			    "prepare tx aggr skb failed, err=%d\n", err);
		return;
	}

	if (atomic_read(&port->tx_data_urb_pending) >=
	    MWIFIEX_TX_DATA_URB) {
		port->block_status = true;
		adapter->data_sent =
			mwifiex_usb_data_sent(adapter);
		err = -1;
		goto done;
	}

	if (port->tx_data_ix >= MWIFIEX_TX_DATA_URB)
		port->tx_data_ix = 0;

	urb_cnxt = &port->tx_data_list[port->tx_data_ix++];
	err = mwifiex_usb_construct_send_urb(adapter, port, port->tx_data_ep,
					     urb_cnxt, skb_send);
done:
	if (err == -1)
		mwifiex_write_data_complete(adapter, skb_send, 0, -1);
	spin_unlock_irqrestore(&port->tx_aggr_lock, flags);
}

/* This function write a command/data packet to card. */
static int mwifiex_usb_host_to_card(struct mwifiex_adapter *adapter, u8 ep,
				    struct sk_buff *skb,
				    struct mwifiex_tx_param *tx_param)
{
	struct usb_card_rec *card = adapter->card;
	struct urb_context *context = NULL;
	struct usb_tx_data_port *port = NULL;
	unsigned long flags;
	int idx, ret;

	if (adapter->is_suspended) {
		mwifiex_dbg(adapter, ERROR,
			    "%s: not allowed while suspended\n", __func__);
		return -1;
	}

	if (adapter->surprise_removed) {
		mwifiex_dbg(adapter, ERROR, "%s: device removed\n", __func__);
		return -1;
	}

	mwifiex_dbg(adapter, INFO, "%s: ep=%d\n", __func__, ep);

	if (ep == card->tx_cmd_ep) {
		context = &card->tx_cmd;
	} else {
		/* get the data port structure for endpoint */
		for (idx = 0; idx < MWIFIEX_TX_DATA_PORT; idx++) {
			if (ep == card->port[idx].tx_data_ep) {
				port = &card->port[idx];
				if (atomic_read(&port->tx_data_urb_pending)
				    >= MWIFIEX_TX_DATA_URB) {
					port->block_status = true;
					adapter->data_sent =
						mwifiex_usb_data_sent(adapter);
					return -EBUSY;
				}
				if (port->tx_data_ix >= MWIFIEX_TX_DATA_URB)
					port->tx_data_ix = 0;
				break;
			}
		}

		if (!port) {
			mwifiex_dbg(adapter, ERROR, "Wrong usb tx data port\n");
			return -1;
		}

		if (adapter->bus_aggr.enable) {
			spin_lock_irqsave(&port->tx_aggr_lock, flags);
			ret =  mwifiex_usb_aggr_tx_data(adapter, ep, skb,
							tx_param, port);
			spin_unlock_irqrestore(&port->tx_aggr_lock, flags);
			return ret;
		}

		context = &port->tx_data_list[port->tx_data_ix++];
	}

	return mwifiex_usb_construct_send_urb(adapter, port, ep, context, skb);
}

static int mwifiex_usb_tx_init(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
	struct usb_tx_data_port *port;
	int i, j;

	card->tx_cmd.adapter = adapter;
	card->tx_cmd.ep = card->tx_cmd_ep;

	card->tx_cmd.urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!card->tx_cmd.urb)
		return -ENOMEM;

	for (i = 0; i < MWIFIEX_TX_DATA_PORT; i++) {
		port = &card->port[i];
		if (!port->tx_data_ep)
			continue;
		port->tx_data_ix = 0;
		skb_queue_head_init(&port->tx_aggr.aggr_list);
		if (port->tx_data_ep == MWIFIEX_USB_EP_DATA)
			port->block_status = false;
		else
			port->block_status = true;
		for (j = 0; j < MWIFIEX_TX_DATA_URB; j++) {
			port->tx_data_list[j].adapter = adapter;
			port->tx_data_list[j].ep = port->tx_data_ep;
			port->tx_data_list[j].urb =
					usb_alloc_urb(0, GFP_KERNEL);
			if (!port->tx_data_list[j].urb)
				return -ENOMEM;
		}

		port->tx_aggr.timer_cnxt.adapter = adapter;
		port->tx_aggr.timer_cnxt.port = port;
		port->tx_aggr.timer_cnxt.is_hold_timer_set = false;
		port->tx_aggr.timer_cnxt.hold_tmo_msecs = 0;
		setup_timer(&port->tx_aggr.timer_cnxt.hold_timer,
			    mwifiex_usb_tx_aggr_tmo,
			    (unsigned long)&port->tx_aggr.timer_cnxt);
	}

	return 0;
}

static int mwifiex_usb_rx_init(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
	int i;

	card->rx_cmd.adapter = adapter;
	card->rx_cmd.ep = card->rx_cmd_ep;

	card->rx_cmd.urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!card->rx_cmd.urb)
		return -ENOMEM;

	card->rx_cmd.skb = dev_alloc_skb(MWIFIEX_RX_CMD_BUF_SIZE);
	if (!card->rx_cmd.skb)
		return -ENOMEM;

	if (mwifiex_usb_submit_rx_urb(&card->rx_cmd, MWIFIEX_RX_CMD_BUF_SIZE))
		return -1;

	for (i = 0; i < MWIFIEX_RX_DATA_URB; i++) {
		card->rx_data_list[i].adapter = adapter;
		card->rx_data_list[i].ep = card->rx_data_ep;

		card->rx_data_list[i].urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!card->rx_data_list[i].urb)
			return -1;
		if (mwifiex_usb_submit_rx_urb(&card->rx_data_list[i],
					      MWIFIEX_RX_DATA_BUF_SIZE))
			return -1;
	}

	return 0;
}

/* This function register usb device and initialize parameter. */
static int mwifiex_register_dev(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;

	card->adapter = adapter;

	switch (le16_to_cpu(card->udev->descriptor.idProduct)) {
	case USB8997_PID_1:
	case USB8997_PID_2:
		adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K;
		strcpy(adapter->fw_name, USB8997_DEFAULT_FW_NAME);
		adapter->ext_scan = true;
		break;
	case USB8766_PID_1:
	case USB8766_PID_2:
		adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
		strcpy(adapter->fw_name, USB8766_DEFAULT_FW_NAME);
		adapter->ext_scan = true;
		break;
	case USB8801_PID_1:
	case USB8801_PID_2:
		adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
		strcpy(adapter->fw_name, USB8801_DEFAULT_FW_NAME);
		adapter->ext_scan = false;
		break;
	case USB8797_PID_1:
	case USB8797_PID_2:
	default:
		adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
		strcpy(adapter->fw_name, USB8797_DEFAULT_FW_NAME);
		break;
	}

	adapter->usb_mc_status = false;
	adapter->usb_mc_setup = false;

	return 0;
}

static void mwifiex_usb_cleanup_tx_aggr(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
	struct usb_tx_data_port *port;
	struct sk_buff *skb_tmp;
	int idx;

	for (idx = 0; idx < MWIFIEX_TX_DATA_PORT; idx++) {
		port = &card->port[idx];
		if (adapter->bus_aggr.enable)
			while ((skb_tmp =
				skb_dequeue(&port->tx_aggr.aggr_list)))
				mwifiex_write_data_complete(adapter, skb_tmp,
							    0, -1);
		del_timer_sync(&port->tx_aggr.timer_cnxt.hold_timer);
		port->tx_aggr.timer_cnxt.is_hold_timer_set = false;
		port->tx_aggr.timer_cnxt.hold_tmo_msecs = 0;
	}
}

static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;

	mwifiex_usb_cleanup_tx_aggr(adapter);

	card->adapter = NULL;
}

static int mwifiex_prog_fw_w_helper(struct mwifiex_adapter *adapter,
				    struct mwifiex_fw_image *fw)
{
	int ret = 0;
	u8 *firmware = fw->fw_buf, *recv_buff;
	u32 retries = USB8XXX_FW_MAX_RETRY + 1;
	u32 dlen;
	u32 fw_seqnum = 0, tlen = 0, dnld_cmd = 0;
	struct fw_data *fwdata;
	struct fw_sync_header sync_fw;
	u8 check_winner = 1;

	if (!firmware) {
		mwifiex_dbg(adapter, ERROR,
			    "No firmware image found! Terminating download\n");
		ret = -1;
		goto fw_exit;
	}

	/* Allocate memory for transmit */
	fwdata = kzalloc(FW_DNLD_TX_BUF_SIZE, GFP_KERNEL);
	if (!fwdata) {
		ret = -ENOMEM;
		goto fw_exit;
	}

	/* Allocate memory for receive */
	recv_buff = kzalloc(FW_DNLD_RX_BUF_SIZE, GFP_KERNEL);
	if (!recv_buff) {
		ret = -ENOMEM;
		goto cleanup;
	}

	do {
		/* Send pseudo data to check winner status first */
		if (check_winner) {
			memset(&fwdata->fw_hdr, 0, sizeof(struct fw_header));
			dlen = 0;
		} else {
			/* copy the header of the fw_data to get the length */
			memcpy(&fwdata->fw_hdr, &firmware[tlen],
			       sizeof(struct fw_header));

			dlen = le32_to_cpu(fwdata->fw_hdr.data_len);
			dnld_cmd = le32_to_cpu(fwdata->fw_hdr.dnld_cmd);
			tlen += sizeof(struct fw_header);

			/* Command 7 doesn't have data length field */
			if (dnld_cmd == FW_CMD_7)
				dlen = 0;

			memcpy(fwdata->data, &firmware[tlen], dlen);

			fwdata->seq_num = cpu_to_le32(fw_seqnum);
			tlen += dlen;
		}

		/* If the send/receive fails or CRC occurs then retry */
		while (--retries) {
			u8 *buf = (u8 *)fwdata;
			u32 len = FW_DATA_XMIT_SIZE;

			/* send the firmware block */
			ret = mwifiex_write_data_sync(adapter, buf, &len,
						MWIFIEX_USB_EP_CMD_EVENT,
						MWIFIEX_USB_TIMEOUT);
			if (ret) {
				mwifiex_dbg(adapter, ERROR,
					    "write_data_sync: failed: %d\n",
					    ret);
				continue;
			}

			buf = recv_buff;
			len = FW_DNLD_RX_BUF_SIZE;

			/* Receive the firmware block response */
			ret = mwifiex_read_data_sync(adapter, buf, &len,
						MWIFIEX_USB_EP_CMD_EVENT,
						MWIFIEX_USB_TIMEOUT);
			if (ret) {
				mwifiex_dbg(adapter, ERROR,
					    "read_data_sync: failed: %d\n",
					    ret);
				continue;
			}

			memcpy(&sync_fw, recv_buff,
			       sizeof(struct fw_sync_header));

			/* check 1st firmware block resp for highest bit set */
			if (check_winner) {
				if (le32_to_cpu(sync_fw.cmd) & 0x80000000) {
					mwifiex_dbg(adapter, WARN,
						    "USB is not the winner %#x\n",
						    sync_fw.cmd);

					/* returning success */
					ret = 0;
					goto cleanup;
				}

				mwifiex_dbg(adapter, MSG,
					    "start to download FW...\n");

				check_winner = 0;
				break;
			}

			/* check the firmware block response for CRC errors */
			if (sync_fw.cmd) {
				mwifiex_dbg(adapter, ERROR,
					    "FW received block with CRC %#x\n",
					    sync_fw.cmd);
				ret = -1;
				continue;
			}

			retries = USB8XXX_FW_MAX_RETRY + 1;
			break;
		}
		fw_seqnum++;
	} while ((dnld_cmd != FW_HAS_LAST_BLOCK) && retries);

cleanup:
	mwifiex_dbg(adapter, MSG,
		    "info: FW download over, size %d bytes\n", tlen);

	kfree(recv_buff);
	kfree(fwdata);

	if (retries)
		ret = 0;
fw_exit:
	return ret;
}

static int mwifiex_usb_dnld_fw(struct mwifiex_adapter *adapter,
			struct mwifiex_fw_image *fw)
{
	int ret;
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;

	if (card->usb_boot_state == USB8XXX_FW_DNLD) {
		ret = mwifiex_prog_fw_w_helper(adapter, fw);
		if (ret)
			return -1;

		/* Boot state changes after successful firmware download */
		if (card->usb_boot_state == USB8XXX_FW_DNLD)
			return -1;
	}

	ret = mwifiex_usb_rx_init(adapter);
	if (!ret)
		ret = mwifiex_usb_tx_init(adapter);

	return ret;
}

static void mwifiex_submit_rx_urb(struct mwifiex_adapter *adapter, u8 ep)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;

	skb_push(card->rx_cmd.skb, INTF_HEADER_LEN);
	if ((ep == card->rx_cmd_ep) &&
	    (!atomic_read(&card->rx_cmd_urb_pending)))
		mwifiex_usb_submit_rx_urb(&card->rx_cmd,
					  MWIFIEX_RX_CMD_BUF_SIZE);

	return;
}

static int mwifiex_usb_cmd_event_complete(struct mwifiex_adapter *adapter,
				       struct sk_buff *skb)
{
	mwifiex_submit_rx_urb(adapter, MWIFIEX_USB_EP_CMD_EVENT);

	return 0;
}

/* This function wakes up the card. */
static int mwifiex_pm_wakeup_card(struct mwifiex_adapter *adapter)
{
	/* Simulation of HS_AWAKE event */
	adapter->pm_wakeup_fw_try = false;
	del_timer(&adapter->wakeup_timer);
	adapter->pm_wakeup_card_req = false;
	adapter->ps_state = PS_STATE_AWAKE;

	return 0;
}

static void mwifiex_usb_submit_rem_rx_urbs(struct mwifiex_adapter *adapter)
{
	struct usb_card_rec *card = (struct usb_card_rec *)adapter->card;
	int i;
	struct urb_context *ctx;

	for (i = 0; i < MWIFIEX_RX_DATA_URB; i++) {
		if (card->rx_data_list[i].skb)
			continue;
		ctx = &card->rx_data_list[i];
		mwifiex_usb_submit_rx_urb(ctx, MWIFIEX_RX_DATA_BUF_SIZE);
	}
}

/* This function is called after the card has woken up. */
static inline int
mwifiex_pm_wakeup_card_complete(struct mwifiex_adapter *adapter)
{
	return 0;
}

static struct mwifiex_if_ops usb_ops = {
	.register_dev =		mwifiex_register_dev,
	.unregister_dev =	mwifiex_unregister_dev,
	.wakeup =		mwifiex_pm_wakeup_card,
	.wakeup_complete =	mwifiex_pm_wakeup_card_complete,

	/* USB specific */
	.dnld_fw =		mwifiex_usb_dnld_fw,
	.cmdrsp_complete =	mwifiex_usb_cmd_event_complete,
	.event_complete =	mwifiex_usb_cmd_event_complete,
	.host_to_card =		mwifiex_usb_host_to_card,
	.submit_rem_rx_urbs =	mwifiex_usb_submit_rem_rx_urbs,
	.multi_port_resync =	mwifiex_usb_port_resync,
	.is_port_ready =	mwifiex_usb_is_port_ready,
};

module_usb_driver(mwifiex_usb_driver);

MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell WiFi-Ex USB Driver version" USB_VERSION);
MODULE_VERSION(USB_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_FIRMWARE(USB8766_DEFAULT_FW_NAME);
MODULE_FIRMWARE(USB8797_DEFAULT_FW_NAME);
MODULE_FIRMWARE(USB8801_DEFAULT_FW_NAME);
MODULE_FIRMWARE(USB8997_DEFAULT_FW_NAME);