summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
blob: 2178675ae1a44d0e04afdd4d26ad6aa0625da8cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
// SPDX-License-Identifier: ISC
/*
 * Copyright (c) 2011 Broadcom Corporation
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>

#include <brcmu_utils.h>
#include <brcm_hw_ids.h>
#include <brcmu_wifi.h>
#include "bus.h"
#include "debug.h"
#include "firmware.h"
#include "usb.h"
#include "core.h"
#include "common.h"
#include "bcdc.h"


#define IOCTL_RESP_TIMEOUT		msecs_to_jiffies(2000)

#define BRCMF_USB_RESET_GETVER_SPINWAIT	100	/* in unit of ms */
#define BRCMF_USB_RESET_GETVER_LOOP_CNT	10

#define BRCMF_POSTBOOT_ID		0xA123  /* ID to detect if dongle
						   has boot up */
#define BRCMF_USB_NRXQ			50
#define BRCMF_USB_NTXQ			50

#define BRCMF_USB_CBCTL_WRITE		0
#define BRCMF_USB_CBCTL_READ		1
#define BRCMF_USB_MAX_PKT_SIZE		1600

BRCMF_FW_DEF(43143, "brcmfmac43143");
BRCMF_FW_DEF(43236B, "brcmfmac43236b");
BRCMF_FW_DEF(43242A, "brcmfmac43242a");
BRCMF_FW_DEF(43569, "brcmfmac43569");
BRCMF_FW_DEF(4373, "brcmfmac4373");

static const struct brcmf_firmware_mapping brcmf_usb_fwnames[] = {
	BRCMF_FW_ENTRY(BRCM_CC_43143_CHIP_ID, 0xFFFFFFFF, 43143),
	BRCMF_FW_ENTRY(BRCM_CC_43235_CHIP_ID, 0x00000008, 43236B),
	BRCMF_FW_ENTRY(BRCM_CC_43236_CHIP_ID, 0x00000008, 43236B),
	BRCMF_FW_ENTRY(BRCM_CC_43238_CHIP_ID, 0x00000008, 43236B),
	BRCMF_FW_ENTRY(BRCM_CC_43242_CHIP_ID, 0xFFFFFFFF, 43242A),
	BRCMF_FW_ENTRY(BRCM_CC_43566_CHIP_ID, 0xFFFFFFFF, 43569),
	BRCMF_FW_ENTRY(BRCM_CC_43569_CHIP_ID, 0xFFFFFFFF, 43569),
	BRCMF_FW_ENTRY(CY_CC_4373_CHIP_ID, 0xFFFFFFFF, 4373)
};

#define TRX_MAGIC		0x30524448	/* "HDR0" */
#define TRX_MAX_OFFSET		3		/* Max number of file offsets */
#define TRX_UNCOMP_IMAGE	0x20		/* Trx holds uncompressed img */
#define TRX_RDL_CHUNK		1500		/* size of each dl transfer */
#define TRX_OFFSETS_DLFWLEN_IDX	0

/* Control messages: bRequest values */
#define DL_GETSTATE	0	/* returns the rdl_state_t struct */
#define DL_CHECK_CRC	1	/* currently unused */
#define DL_GO		2	/* execute downloaded image */
#define DL_START	3	/* initialize dl state */
#define DL_REBOOT	4	/* reboot the device in 2 seconds */
#define DL_GETVER	5	/* returns the bootrom_id_t struct */
#define DL_GO_PROTECTED	6	/* execute the downloaded code and set reset
				 * event to occur in 2 seconds.  It is the
				 * responsibility of the downloaded code to
				 * clear this event
				 */
#define DL_EXEC		7	/* jump to a supplied address */
#define DL_RESETCFG	8	/* To support single enum on dongle
				 * - Not used by bootloader
				 */
#define DL_DEFER_RESP_OK 9	/* Potentially defer the response to setup
				 * if resp unavailable
				 */

/* states */
#define DL_WAITING	0	/* waiting to rx first pkt */
#define DL_READY	1	/* hdr was good, waiting for more of the
				 * compressed image
				 */
#define DL_BAD_HDR	2	/* hdr was corrupted */
#define DL_BAD_CRC	3	/* compressed image was corrupted */
#define DL_RUNNABLE	4	/* download was successful,waiting for go cmd */
#define DL_START_FAIL	5	/* failed to initialize correctly */
#define DL_NVRAM_TOOBIG	6	/* host specified nvram data exceeds DL_NVRAM
				 * value
				 */
#define DL_IMAGE_TOOBIG	7	/* firmware image too big */


struct trx_header_le {
	__le32 magic;		/* "HDR0" */
	__le32 len;		/* Length of file including header */
	__le32 crc32;		/* CRC from flag_version to end of file */
	__le32 flag_version;	/* 0:15 flags, 16:31 version */
	__le32 offsets[TRX_MAX_OFFSET];	/* Offsets of partitions from start of
					 * header
					 */
};

struct rdl_state_le {
	__le32 state;
	__le32 bytes;
};

struct bootrom_id_le {
	__le32 chip;		/* Chip id */
	__le32 chiprev;		/* Chip rev */
	__le32 ramsize;		/* Size of  RAM */
	__le32 remapbase;	/* Current remap base address */
	__le32 boardtype;	/* Type of board */
	__le32 boardrev;	/* Board revision */
};

struct brcmf_usb_image {
	struct list_head list;
	s8 *fwname;
	u8 *image;
	int image_len;
};

struct brcmf_usbdev_info {
	struct brcmf_usbdev bus_pub; /* MUST BE FIRST */
	spinlock_t qlock;
	struct list_head rx_freeq;
	struct list_head rx_postq;
	struct list_head tx_freeq;
	struct list_head tx_postq;
	uint rx_pipe, tx_pipe;

	int rx_low_watermark;
	int tx_low_watermark;
	int tx_high_watermark;
	int tx_freecount;
	bool tx_flowblock;
	spinlock_t tx_flowblock_lock;

	struct brcmf_usbreq *tx_reqs;
	struct brcmf_usbreq *rx_reqs;

	char fw_name[BRCMF_FW_NAME_LEN];
	const u8 *image;	/* buffer for combine fw and nvram */
	int image_len;

	struct usb_device *usbdev;
	struct device *dev;
	struct completion dev_init_done;

	int ctl_in_pipe, ctl_out_pipe;
	struct urb *ctl_urb; /* URB for control endpoint */
	struct usb_ctrlrequest ctl_write;
	struct usb_ctrlrequest ctl_read;
	u32 ctl_urb_actual_length;
	int ctl_urb_status;
	int ctl_completed;
	wait_queue_head_t ioctl_resp_wait;
	ulong ctl_op;
	u8 ifnum;

	struct urb *bulk_urb; /* used for FW download */

	struct brcmf_mp_device *settings;
};

static void brcmf_usb_rx_refill(struct brcmf_usbdev_info *devinfo,
				struct brcmf_usbreq  *req);

static struct brcmf_usbdev *brcmf_usb_get_buspub(struct device *dev)
{
	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
	return bus_if->bus_priv.usb;
}

static struct brcmf_usbdev_info *brcmf_usb_get_businfo(struct device *dev)
{
	return brcmf_usb_get_buspub(dev)->devinfo;
}

static int brcmf_usb_ioctl_resp_wait(struct brcmf_usbdev_info *devinfo)
{
	return wait_event_timeout(devinfo->ioctl_resp_wait,
				  devinfo->ctl_completed, IOCTL_RESP_TIMEOUT);
}

static void brcmf_usb_ioctl_resp_wake(struct brcmf_usbdev_info *devinfo)
{
	wake_up(&devinfo->ioctl_resp_wait);
}

static void
brcmf_usb_ctl_complete(struct brcmf_usbdev_info *devinfo, int type, int status)
{
	brcmf_dbg(USB, "Enter, status=%d\n", status);

	if (unlikely(devinfo == NULL))
		return;

	if (type == BRCMF_USB_CBCTL_READ) {
		if (status == 0)
			devinfo->bus_pub.stats.rx_ctlpkts++;
		else
			devinfo->bus_pub.stats.rx_ctlerrs++;
	} else if (type == BRCMF_USB_CBCTL_WRITE) {
		if (status == 0)
			devinfo->bus_pub.stats.tx_ctlpkts++;
		else
			devinfo->bus_pub.stats.tx_ctlerrs++;
	}

	devinfo->ctl_urb_status = status;
	devinfo->ctl_completed = true;
	brcmf_usb_ioctl_resp_wake(devinfo);
}

static void
brcmf_usb_ctlread_complete(struct urb *urb)
{
	struct brcmf_usbdev_info *devinfo =
		(struct brcmf_usbdev_info *)urb->context;

	brcmf_dbg(USB, "Enter\n");
	devinfo->ctl_urb_actual_length = urb->actual_length;
	brcmf_usb_ctl_complete(devinfo, BRCMF_USB_CBCTL_READ,
		urb->status);
}

static void
brcmf_usb_ctlwrite_complete(struct urb *urb)
{
	struct brcmf_usbdev_info *devinfo =
		(struct brcmf_usbdev_info *)urb->context;

	brcmf_dbg(USB, "Enter\n");
	brcmf_usb_ctl_complete(devinfo, BRCMF_USB_CBCTL_WRITE,
		urb->status);
}

static int
brcmf_usb_send_ctl(struct brcmf_usbdev_info *devinfo, u8 *buf, int len)
{
	int ret;
	u16 size;

	brcmf_dbg(USB, "Enter\n");
	if (devinfo == NULL || buf == NULL ||
	    len == 0 || devinfo->ctl_urb == NULL)
		return -EINVAL;

	size = len;
	devinfo->ctl_write.wLength = cpu_to_le16p(&size);
	devinfo->ctl_urb->transfer_buffer_length = size;
	devinfo->ctl_urb_status = 0;
	devinfo->ctl_urb_actual_length = 0;

	usb_fill_control_urb(devinfo->ctl_urb,
		devinfo->usbdev,
		devinfo->ctl_out_pipe,
		(unsigned char *) &devinfo->ctl_write,
		buf, size,
		(usb_complete_t)brcmf_usb_ctlwrite_complete,
		devinfo);

	ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
	if (ret < 0)
		brcmf_err("usb_submit_urb failed %d\n", ret);

	return ret;
}

static int
brcmf_usb_recv_ctl(struct brcmf_usbdev_info *devinfo, u8 *buf, int len)
{
	int ret;
	u16 size;

	brcmf_dbg(USB, "Enter\n");
	if ((devinfo == NULL) || (buf == NULL) || (len == 0)
		|| (devinfo->ctl_urb == NULL))
		return -EINVAL;

	size = len;
	devinfo->ctl_read.wLength = cpu_to_le16p(&size);
	devinfo->ctl_urb->transfer_buffer_length = size;

	devinfo->ctl_read.bRequestType = USB_DIR_IN
		| USB_TYPE_CLASS | USB_RECIP_INTERFACE;
	devinfo->ctl_read.bRequest = 1;

	usb_fill_control_urb(devinfo->ctl_urb,
		devinfo->usbdev,
		devinfo->ctl_in_pipe,
		(unsigned char *) &devinfo->ctl_read,
		buf, size,
		(usb_complete_t)brcmf_usb_ctlread_complete,
		devinfo);

	ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
	if (ret < 0)
		brcmf_err("usb_submit_urb failed %d\n", ret);

	return ret;
}

static int brcmf_usb_tx_ctlpkt(struct device *dev, u8 *buf, u32 len)
{
	int err = 0;
	int timeout = 0;
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);
	struct usb_interface *intf = to_usb_interface(dev);

	brcmf_dbg(USB, "Enter\n");

	err = usb_autopm_get_interface(intf);
	if (err)
		goto out;

	if (devinfo->bus_pub.state != BRCMFMAC_USB_STATE_UP) {
		err = -EIO;
		goto fail;
	}

	if (test_and_set_bit(0, &devinfo->ctl_op)) {
		err = -EIO;
		goto fail;
	}

	devinfo->ctl_completed = false;
	err = brcmf_usb_send_ctl(devinfo, buf, len);
	if (err) {
		brcmf_err("fail %d bytes: %d\n", err, len);
		clear_bit(0, &devinfo->ctl_op);
		goto fail;
	}
	timeout = brcmf_usb_ioctl_resp_wait(devinfo);
	if (!timeout) {
		brcmf_err("Txctl wait timed out\n");
		usb_kill_urb(devinfo->ctl_urb);
		err = -EIO;
		goto fail;
	}
	clear_bit(0, &devinfo->ctl_op);

fail:
	usb_autopm_put_interface(intf);
out:
	return err;
}

static int brcmf_usb_rx_ctlpkt(struct device *dev, u8 *buf, u32 len)
{
	int err = 0;
	int timeout = 0;
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);
	struct usb_interface *intf = to_usb_interface(dev);

	brcmf_dbg(USB, "Enter\n");

	err = usb_autopm_get_interface(intf);
	if (err)
		goto out;

	if (devinfo->bus_pub.state != BRCMFMAC_USB_STATE_UP) {
		err = -EIO;
		goto fail;
	}

	if (test_and_set_bit(0, &devinfo->ctl_op)) {
		err = -EIO;
		goto fail;
	}

	devinfo->ctl_completed = false;
	err = brcmf_usb_recv_ctl(devinfo, buf, len);
	if (err) {
		brcmf_err("fail %d bytes: %d\n", err, len);
		clear_bit(0, &devinfo->ctl_op);
		goto fail;
	}
	timeout = brcmf_usb_ioctl_resp_wait(devinfo);
	err = devinfo->ctl_urb_status;
	if (!timeout) {
		brcmf_err("rxctl wait timed out\n");
		usb_kill_urb(devinfo->ctl_urb);
		err = -EIO;
		goto fail;
	}
	clear_bit(0, &devinfo->ctl_op);
fail:
	usb_autopm_put_interface(intf);
	if (!err)
		return devinfo->ctl_urb_actual_length;
out:
	return err;
}

static struct brcmf_usbreq *brcmf_usb_deq(struct brcmf_usbdev_info *devinfo,
					  struct list_head *q, int *counter)
{
	unsigned long flags;
	struct brcmf_usbreq  *req;
	spin_lock_irqsave(&devinfo->qlock, flags);
	if (list_empty(q)) {
		spin_unlock_irqrestore(&devinfo->qlock, flags);
		return NULL;
	}
	req = list_entry(q->next, struct brcmf_usbreq, list);
	list_del_init(q->next);
	if (counter)
		(*counter)--;
	spin_unlock_irqrestore(&devinfo->qlock, flags);
	return req;

}

static void brcmf_usb_enq(struct brcmf_usbdev_info *devinfo,
			  struct list_head *q, struct brcmf_usbreq *req,
			  int *counter)
{
	unsigned long flags;
	spin_lock_irqsave(&devinfo->qlock, flags);
	list_add_tail(&req->list, q);
	if (counter)
		(*counter)++;
	spin_unlock_irqrestore(&devinfo->qlock, flags);
}

static struct brcmf_usbreq *
brcmf_usbdev_qinit(struct list_head *q, int qsize)
{
	int i;
	struct brcmf_usbreq *req, *reqs;

	reqs = kcalloc(qsize, sizeof(struct brcmf_usbreq), GFP_ATOMIC);
	if (reqs == NULL)
		return NULL;

	req = reqs;

	for (i = 0; i < qsize; i++) {
		req->urb = usb_alloc_urb(0, GFP_ATOMIC);
		if (!req->urb)
			goto fail;

		INIT_LIST_HEAD(&req->list);
		list_add_tail(&req->list, q);
		req++;
	}
	return reqs;
fail:
	brcmf_err("fail!\n");
	while (!list_empty(q)) {
		req = list_entry(q->next, struct brcmf_usbreq, list);
		if (req)
			usb_free_urb(req->urb);
		list_del(q->next);
	}
	kfree(reqs);
	return NULL;

}

static void brcmf_usb_free_q(struct list_head *q)
{
	struct brcmf_usbreq *req, *next;

	list_for_each_entry_safe(req, next, q, list) {
		if (!req->urb) {
			brcmf_err("bad req\n");
			break;
		}
		usb_free_urb(req->urb);
		list_del_init(&req->list);
	}
}

static void brcmf_usb_del_fromq(struct brcmf_usbdev_info *devinfo,
				struct brcmf_usbreq *req)
{
	unsigned long flags;

	spin_lock_irqsave(&devinfo->qlock, flags);
	list_del_init(&req->list);
	spin_unlock_irqrestore(&devinfo->qlock, flags);
}


static void brcmf_usb_tx_complete(struct urb *urb)
{
	struct brcmf_usbreq *req = (struct brcmf_usbreq *)urb->context;
	struct brcmf_usbdev_info *devinfo = req->devinfo;
	unsigned long flags;

	brcmf_dbg(USB, "Enter, urb->status=%d, skb=%p\n", urb->status,
		  req->skb);
	brcmf_usb_del_fromq(devinfo, req);

	brcmf_proto_bcdc_txcomplete(devinfo->dev, req->skb, urb->status == 0);
	req->skb = NULL;
	brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req, &devinfo->tx_freecount);
	spin_lock_irqsave(&devinfo->tx_flowblock_lock, flags);
	if (devinfo->tx_freecount > devinfo->tx_high_watermark &&
		devinfo->tx_flowblock) {
		brcmf_proto_bcdc_txflowblock(devinfo->dev, false);
		devinfo->tx_flowblock = false;
	}
	spin_unlock_irqrestore(&devinfo->tx_flowblock_lock, flags);
}

static void brcmf_usb_rx_complete(struct urb *urb)
{
	struct brcmf_usbreq  *req = (struct brcmf_usbreq *)urb->context;
	struct brcmf_usbdev_info *devinfo = req->devinfo;
	struct sk_buff *skb;

	brcmf_dbg(USB, "Enter, urb->status=%d\n", urb->status);
	brcmf_usb_del_fromq(devinfo, req);
	skb = req->skb;
	req->skb = NULL;

	/* zero length packets indicate usb "failure". Do not refill */
	if (urb->status != 0 || !urb->actual_length) {
		brcmu_pkt_buf_free_skb(skb);
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
		return;
	}

	if (devinfo->bus_pub.state == BRCMFMAC_USB_STATE_UP ||
	    devinfo->bus_pub.state == BRCMFMAC_USB_STATE_SLEEP) {
		skb_put(skb, urb->actual_length);
		brcmf_rx_frame(devinfo->dev, skb, true, true);
		brcmf_usb_rx_refill(devinfo, req);
		usb_mark_last_busy(urb->dev);
	} else {
		brcmu_pkt_buf_free_skb(skb);
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
	}
	return;

}

static void brcmf_usb_rx_refill(struct brcmf_usbdev_info *devinfo,
				struct brcmf_usbreq  *req)
{
	struct sk_buff *skb;
	int ret;

	if (!req || !devinfo)
		return;

	skb = dev_alloc_skb(devinfo->bus_pub.bus_mtu);
	if (!skb) {
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
		return;
	}
	req->skb = skb;

	usb_fill_bulk_urb(req->urb, devinfo->usbdev, devinfo->rx_pipe,
			  skb->data, skb_tailroom(skb), brcmf_usb_rx_complete,
			  req);
	req->devinfo = devinfo;
	brcmf_usb_enq(devinfo, &devinfo->rx_postq, req, NULL);

	ret = usb_submit_urb(req->urb, GFP_ATOMIC);
	if (ret) {
		brcmf_usb_del_fromq(devinfo, req);
		brcmu_pkt_buf_free_skb(req->skb);
		req->skb = NULL;
		brcmf_usb_enq(devinfo, &devinfo->rx_freeq, req, NULL);
	}
	return;
}

static void brcmf_usb_rx_fill_all(struct brcmf_usbdev_info *devinfo)
{
	struct brcmf_usbreq *req;

	if (devinfo->bus_pub.state != BRCMFMAC_USB_STATE_UP) {
		brcmf_err("bus is not up=%d\n", devinfo->bus_pub.state);
		return;
	}
	while ((req = brcmf_usb_deq(devinfo, &devinfo->rx_freeq, NULL)) != NULL)
		brcmf_usb_rx_refill(devinfo, req);
}

static void
brcmf_usb_state_change(struct brcmf_usbdev_info *devinfo, int state)
{
	struct brcmf_bus *bcmf_bus = devinfo->bus_pub.bus;

	brcmf_dbg(USB, "Enter, current state=%d, new state=%d\n",
		  devinfo->bus_pub.state, state);

	if (devinfo->bus_pub.state == state)
		return;

	devinfo->bus_pub.state = state;

	/* update state of upper layer */
	if (state == BRCMFMAC_USB_STATE_DOWN) {
		brcmf_dbg(USB, "DBUS is down\n");
		brcmf_bus_change_state(bcmf_bus, BRCMF_BUS_DOWN);
	} else if (state == BRCMFMAC_USB_STATE_UP) {
		brcmf_dbg(USB, "DBUS is up\n");
		brcmf_bus_change_state(bcmf_bus, BRCMF_BUS_UP);
	} else {
		brcmf_dbg(USB, "DBUS current state=%d\n", state);
	}
}

static int brcmf_usb_tx(struct device *dev, struct sk_buff *skb)
{
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);
	struct brcmf_usbreq  *req;
	int ret;
	unsigned long flags;
	struct usb_interface *intf = to_usb_interface(dev);

	ret = usb_autopm_get_interface(intf);
	if (ret)
		goto out;

	brcmf_dbg(USB, "Enter, skb=%p\n", skb);
	if (devinfo->bus_pub.state != BRCMFMAC_USB_STATE_UP) {
		ret = -EIO;
		goto fail;
	}

	req = brcmf_usb_deq(devinfo, &devinfo->tx_freeq,
					&devinfo->tx_freecount);
	if (!req) {
		brcmf_err("no req to send\n");
		ret = -ENOMEM;
		goto fail;
	}

	req->skb = skb;
	req->devinfo = devinfo;
	usb_fill_bulk_urb(req->urb, devinfo->usbdev, devinfo->tx_pipe,
			  skb->data, skb->len, brcmf_usb_tx_complete, req);
	req->urb->transfer_flags |= URB_ZERO_PACKET;
	brcmf_usb_enq(devinfo, &devinfo->tx_postq, req, NULL);
	ret = usb_submit_urb(req->urb, GFP_ATOMIC);
	if (ret) {
		brcmf_err("brcmf_usb_tx usb_submit_urb FAILED\n");
		brcmf_usb_del_fromq(devinfo, req);
		req->skb = NULL;
		brcmf_usb_enq(devinfo, &devinfo->tx_freeq, req,
			      &devinfo->tx_freecount);
		goto fail;
	}

	spin_lock_irqsave(&devinfo->tx_flowblock_lock, flags);
	if (devinfo->tx_freecount < devinfo->tx_low_watermark &&
	    !devinfo->tx_flowblock) {
		brcmf_proto_bcdc_txflowblock(dev, true);
		devinfo->tx_flowblock = true;
	}
	spin_unlock_irqrestore(&devinfo->tx_flowblock_lock, flags);

fail:
	usb_autopm_put_interface(intf);
out:
	return ret;
}


static int brcmf_usb_up(struct device *dev)
{
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);

	brcmf_dbg(USB, "Enter\n");
	if (devinfo->bus_pub.state == BRCMFMAC_USB_STATE_UP)
		return 0;

	/* Success, indicate devinfo is fully up */
	brcmf_usb_state_change(devinfo, BRCMFMAC_USB_STATE_UP);

	if (devinfo->ctl_urb) {
		devinfo->ctl_in_pipe = usb_rcvctrlpipe(devinfo->usbdev, 0);
		devinfo->ctl_out_pipe = usb_sndctrlpipe(devinfo->usbdev, 0);

		/* CTL Write */
		devinfo->ctl_write.bRequestType =
			USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
		devinfo->ctl_write.bRequest = 0;
		devinfo->ctl_write.wValue = cpu_to_le16(0);
		devinfo->ctl_write.wIndex = cpu_to_le16(devinfo->ifnum);

		/* CTL Read */
		devinfo->ctl_read.bRequestType =
			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
		devinfo->ctl_read.bRequest = 1;
		devinfo->ctl_read.wValue = cpu_to_le16(0);
		devinfo->ctl_read.wIndex = cpu_to_le16(devinfo->ifnum);
	}
	brcmf_usb_rx_fill_all(devinfo);
	return 0;
}

static void brcmf_cancel_all_urbs(struct brcmf_usbdev_info *devinfo)
{
	int i;

	if (devinfo->ctl_urb)
		usb_kill_urb(devinfo->ctl_urb);
	if (devinfo->bulk_urb)
		usb_kill_urb(devinfo->bulk_urb);
	if (devinfo->tx_reqs)
		for (i = 0; i < devinfo->bus_pub.ntxq; i++)
			usb_kill_urb(devinfo->tx_reqs[i].urb);
	if (devinfo->rx_reqs)
		for (i = 0; i < devinfo->bus_pub.nrxq; i++)
			usb_kill_urb(devinfo->rx_reqs[i].urb);
}

static void brcmf_usb_down(struct device *dev)
{
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(dev);

	brcmf_dbg(USB, "Enter\n");
	if (devinfo == NULL)
		return;

	if (devinfo->bus_pub.state == BRCMFMAC_USB_STATE_DOWN)
		return;

	brcmf_usb_state_change(devinfo, BRCMFMAC_USB_STATE_DOWN);

	brcmf_cancel_all_urbs(devinfo);
}

static void
brcmf_usb_sync_complete(struct urb *urb)
{
	struct brcmf_usbdev_info *devinfo =
			(struct brcmf_usbdev_info *)urb->context;

	devinfo->ctl_completed = true;
	brcmf_usb_ioctl_resp_wake(devinfo);
}

static int brcmf_usb_dl_cmd(struct brcmf_usbdev_info *devinfo, u8 cmd,
			    void *buffer, int buflen)
{
	int ret;
	char *tmpbuf;
	u16 size;

	if ((!devinfo) || (devinfo->ctl_urb == NULL))
		return -EINVAL;

	tmpbuf = kmalloc(buflen, GFP_ATOMIC);
	if (!tmpbuf)
		return -ENOMEM;

	size = buflen;
	devinfo->ctl_urb->transfer_buffer_length = size;

	devinfo->ctl_read.wLength = cpu_to_le16p(&size);
	devinfo->ctl_read.bRequestType = USB_DIR_IN | USB_TYPE_VENDOR |
		USB_RECIP_INTERFACE;
	devinfo->ctl_read.bRequest = cmd;

	usb_fill_control_urb(devinfo->ctl_urb,
		devinfo->usbdev,
		usb_rcvctrlpipe(devinfo->usbdev, 0),
		(unsigned char *) &devinfo->ctl_read,
		(void *) tmpbuf, size,
		(usb_complete_t)brcmf_usb_sync_complete, devinfo);

	devinfo->ctl_completed = false;
	ret = usb_submit_urb(devinfo->ctl_urb, GFP_ATOMIC);
	if (ret < 0) {
		brcmf_err("usb_submit_urb failed %d\n", ret);
		goto finalize;
	}

	if (!brcmf_usb_ioctl_resp_wait(devinfo)) {
		usb_kill_urb(devinfo->ctl_urb);
		ret = -ETIMEDOUT;
	} else {
		memcpy(buffer, tmpbuf, buflen);
	}

finalize:
	kfree(tmpbuf);
	return ret;
}

static bool
brcmf_usb_dlneeded(struct brcmf_usbdev_info *devinfo)
{
	struct bootrom_id_le id;
	u32 chipid, chiprev;

	brcmf_dbg(USB, "Enter\n");

	if (devinfo == NULL)
		return false;

	/* Check if firmware downloaded already by querying runtime ID */
	id.chip = cpu_to_le32(0xDEAD);
	brcmf_usb_dl_cmd(devinfo, DL_GETVER, &id, sizeof(id));

	chipid = le32_to_cpu(id.chip);
	chiprev = le32_to_cpu(id.chiprev);

	if ((chipid & 0x4300) == 0x4300)
		brcmf_dbg(USB, "chip %x rev 0x%x\n", chipid, chiprev);
	else
		brcmf_dbg(USB, "chip %d rev 0x%x\n", chipid, chiprev);
	if (chipid == BRCMF_POSTBOOT_ID) {
		brcmf_dbg(USB, "firmware already downloaded\n");
		brcmf_usb_dl_cmd(devinfo, DL_RESETCFG, &id, sizeof(id));
		return false;
	} else {
		devinfo->bus_pub.devid = chipid;
		devinfo->bus_pub.chiprev = chiprev;
	}
	return true;
}

static int
brcmf_usb_resetcfg(struct brcmf_usbdev_info *devinfo)
{
	struct bootrom_id_le id;
	u32 loop_cnt;
	int err;

	brcmf_dbg(USB, "Enter\n");

	loop_cnt = 0;
	do {
		mdelay(BRCMF_USB_RESET_GETVER_SPINWAIT);
		loop_cnt++;
		id.chip = cpu_to_le32(0xDEAD);       /* Get the ID */
		err = brcmf_usb_dl_cmd(devinfo, DL_GETVER, &id, sizeof(id));
		if ((err) && (err != -ETIMEDOUT))
			return err;
		if (id.chip == cpu_to_le32(BRCMF_POSTBOOT_ID))
			break;
	} while (loop_cnt < BRCMF_USB_RESET_GETVER_LOOP_CNT);

	if (id.chip == cpu_to_le32(BRCMF_POSTBOOT_ID)) {
		brcmf_dbg(USB, "postboot chip 0x%x/rev 0x%x\n",
			  le32_to_cpu(id.chip), le32_to_cpu(id.chiprev));

		brcmf_usb_dl_cmd(devinfo, DL_RESETCFG, &id, sizeof(id));
		return 0;
	} else {
		brcmf_err("Cannot talk to Dongle. Firmware is not UP, %d ms\n",
			  BRCMF_USB_RESET_GETVER_SPINWAIT * loop_cnt);
		return -EINVAL;
	}
}


static int
brcmf_usb_dl_send_bulk(struct brcmf_usbdev_info *devinfo, void *buffer, int len)
{
	int ret;

	if ((devinfo == NULL) || (devinfo->bulk_urb == NULL))
		return -EINVAL;

	/* Prepare the URB */
	usb_fill_bulk_urb(devinfo->bulk_urb, devinfo->usbdev,
			  devinfo->tx_pipe, buffer, len,
			  (usb_complete_t)brcmf_usb_sync_complete, devinfo);

	devinfo->bulk_urb->transfer_flags |= URB_ZERO_PACKET;

	devinfo->ctl_completed = false;
	ret = usb_submit_urb(devinfo->bulk_urb, GFP_ATOMIC);
	if (ret) {
		brcmf_err("usb_submit_urb failed %d\n", ret);
		return ret;
	}
	ret = brcmf_usb_ioctl_resp_wait(devinfo);
	return (ret == 0);
}

static int
brcmf_usb_dl_writeimage(struct brcmf_usbdev_info *devinfo, u8 *fw, int fwlen)
{
	unsigned int sendlen, sent, dllen;
	char *bulkchunk = NULL, *dlpos;
	struct rdl_state_le state;
	u32 rdlstate, rdlbytes;
	int err = 0;

	brcmf_dbg(USB, "Enter, fw %p, len %d\n", fw, fwlen);

	bulkchunk = kmalloc(TRX_RDL_CHUNK, GFP_ATOMIC);
	if (bulkchunk == NULL) {
		err = -ENOMEM;
		goto fail;
	}

	/* 1) Prepare USB boot loader for runtime image */
	brcmf_usb_dl_cmd(devinfo, DL_START, &state, sizeof(state));

	rdlstate = le32_to_cpu(state.state);
	rdlbytes = le32_to_cpu(state.bytes);

	/* 2) Check we are in the Waiting state */
	if (rdlstate != DL_WAITING) {
		brcmf_err("Failed to DL_START\n");
		err = -EINVAL;
		goto fail;
	}
	sent = 0;
	dlpos = fw;
	dllen = fwlen;

	/* Get chip id and rev */
	while (rdlbytes != dllen) {
		/* Wait until the usb device reports it received all
		 * the bytes we sent */
		if ((rdlbytes == sent) && (rdlbytes != dllen)) {
			if ((dllen-sent) < TRX_RDL_CHUNK)
				sendlen = dllen-sent;
			else
				sendlen = TRX_RDL_CHUNK;

			/* simply avoid having to send a ZLP by ensuring we
			 * never have an even
			 * multiple of 64
			 */
			if (!(sendlen % 64))
				sendlen -= 4;

			/* send data */
			memcpy(bulkchunk, dlpos, sendlen);
			if (brcmf_usb_dl_send_bulk(devinfo, bulkchunk,
						   sendlen)) {
				brcmf_err("send_bulk failed\n");
				err = -EINVAL;
				goto fail;
			}

			dlpos += sendlen;
			sent += sendlen;
		}
		err = brcmf_usb_dl_cmd(devinfo, DL_GETSTATE, &state,
				       sizeof(state));
		if (err) {
			brcmf_err("DL_GETSTATE Failed\n");
			goto fail;
		}

		rdlstate = le32_to_cpu(state.state);
		rdlbytes = le32_to_cpu(state.bytes);

		/* restart if an error is reported */
		if (rdlstate == DL_BAD_HDR || rdlstate == DL_BAD_CRC) {
			brcmf_err("Bad Hdr or Bad CRC state %d\n",
				  rdlstate);
			err = -EINVAL;
			goto fail;
		}
	}

fail:
	kfree(bulkchunk);
	brcmf_dbg(USB, "Exit, err=%d\n", err);
	return err;
}

static int brcmf_usb_dlstart(struct brcmf_usbdev_info *devinfo, u8 *fw, int len)
{
	int err;

	brcmf_dbg(USB, "Enter\n");

	if (devinfo == NULL)
		return -EINVAL;

	if (devinfo->bus_pub.devid == 0xDEAD)
		return -EINVAL;

	err = brcmf_usb_dl_writeimage(devinfo, fw, len);
	if (err == 0)
		devinfo->bus_pub.state = BRCMFMAC_USB_STATE_DL_DONE;
	else
		devinfo->bus_pub.state = BRCMFMAC_USB_STATE_DL_FAIL;
	brcmf_dbg(USB, "Exit, err=%d\n", err);

	return err;
}

static int brcmf_usb_dlrun(struct brcmf_usbdev_info *devinfo)
{
	struct rdl_state_le state;

	brcmf_dbg(USB, "Enter\n");
	if (!devinfo)
		return -EINVAL;

	if (devinfo->bus_pub.devid == 0xDEAD)
		return -EINVAL;

	/* Check we are runnable */
	state.state = 0;
	brcmf_usb_dl_cmd(devinfo, DL_GETSTATE, &state, sizeof(state));

	/* Start the image */
	if (state.state == cpu_to_le32(DL_RUNNABLE)) {
		if (brcmf_usb_dl_cmd(devinfo, DL_GO, &state, sizeof(state)))
			return -ENODEV;
		if (brcmf_usb_resetcfg(devinfo))
			return -ENODEV;
		/* The Dongle may go for re-enumeration. */
	} else {
		brcmf_err("Dongle not runnable\n");
		return -EINVAL;
	}
	brcmf_dbg(USB, "Exit\n");
	return 0;
}

static int
brcmf_usb_fw_download(struct brcmf_usbdev_info *devinfo)
{
	int err;
	struct usb_interface *intf;

	brcmf_dbg(USB, "Enter\n");
	if (!devinfo) {
		err = -ENODEV;
		goto out;
	}

	if (!devinfo->image) {
		brcmf_err("No firmware!\n");
		err = -ENOENT;
		goto out;
	}

	intf = to_usb_interface(devinfo->dev);
	err = usb_autopm_get_interface(intf);
	if (err)
		goto out;

	err = brcmf_usb_dlstart(devinfo,
		(u8 *)devinfo->image, devinfo->image_len);
	if (err == 0)
		err = brcmf_usb_dlrun(devinfo);

	usb_autopm_put_interface(intf);
out:
	return err;
}


static void brcmf_usb_detach(struct brcmf_usbdev_info *devinfo)
{
	brcmf_dbg(USB, "Enter, devinfo %p\n", devinfo);

	/* free the URBS */
	brcmf_usb_free_q(&devinfo->rx_freeq);
	brcmf_usb_free_q(&devinfo->tx_freeq);

	usb_free_urb(devinfo->ctl_urb);
	usb_free_urb(devinfo->bulk_urb);

	kfree(devinfo->tx_reqs);
	kfree(devinfo->rx_reqs);

	if (devinfo->settings)
		brcmf_release_module_param(devinfo->settings);
}


static int check_file(const u8 *headers)
{
	struct trx_header_le *trx;
	int actual_len = -1;

	brcmf_dbg(USB, "Enter\n");
	/* Extract trx header */
	trx = (struct trx_header_le *) headers;
	if (trx->magic != cpu_to_le32(TRX_MAGIC))
		return -1;

	headers += sizeof(struct trx_header_le);

	if (le32_to_cpu(trx->flag_version) & TRX_UNCOMP_IMAGE) {
		actual_len = le32_to_cpu(trx->offsets[TRX_OFFSETS_DLFWLEN_IDX]);
		return actual_len + sizeof(struct trx_header_le);
	}
	return -1;
}


static
struct brcmf_usbdev *brcmf_usb_attach(struct brcmf_usbdev_info *devinfo,
				      int nrxq, int ntxq)
{
	brcmf_dbg(USB, "Enter\n");

	devinfo->bus_pub.nrxq = nrxq;
	devinfo->rx_low_watermark = nrxq / 2;
	devinfo->bus_pub.devinfo = devinfo;
	devinfo->bus_pub.ntxq = ntxq;
	devinfo->bus_pub.state = BRCMFMAC_USB_STATE_DOWN;

	/* flow control when too many tx urbs posted */
	devinfo->tx_low_watermark = ntxq / 4;
	devinfo->tx_high_watermark = devinfo->tx_low_watermark * 3;
	devinfo->bus_pub.bus_mtu = BRCMF_USB_MAX_PKT_SIZE;

	/* Initialize other structure content */
	init_waitqueue_head(&devinfo->ioctl_resp_wait);

	/* Initialize the spinlocks */
	spin_lock_init(&devinfo->qlock);
	spin_lock_init(&devinfo->tx_flowblock_lock);

	INIT_LIST_HEAD(&devinfo->rx_freeq);
	INIT_LIST_HEAD(&devinfo->rx_postq);

	INIT_LIST_HEAD(&devinfo->tx_freeq);
	INIT_LIST_HEAD(&devinfo->tx_postq);

	devinfo->tx_flowblock = false;

	devinfo->rx_reqs = brcmf_usbdev_qinit(&devinfo->rx_freeq, nrxq);
	if (!devinfo->rx_reqs)
		goto error;

	devinfo->tx_reqs = brcmf_usbdev_qinit(&devinfo->tx_freeq, ntxq);
	if (!devinfo->tx_reqs)
		goto error;
	devinfo->tx_freecount = ntxq;

	devinfo->ctl_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!devinfo->ctl_urb)
		goto error;
	devinfo->bulk_urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!devinfo->bulk_urb)
		goto error;

	return &devinfo->bus_pub;

error:
	brcmf_err("failed!\n");
	brcmf_usb_detach(devinfo);
	return NULL;
}

static int brcmf_usb_get_blob(struct device *dev, const struct firmware **fw,
			      enum brcmf_blob_type type)
{
	/* No blobs for USB devices... */
	return -ENOENT;
}

static const struct brcmf_bus_ops brcmf_usb_bus_ops = {
	.preinit = brcmf_usb_up,
	.stop = brcmf_usb_down,
	.txdata = brcmf_usb_tx,
	.txctl = brcmf_usb_tx_ctlpkt,
	.rxctl = brcmf_usb_rx_ctlpkt,
	.get_blob = brcmf_usb_get_blob,
};

#define BRCMF_USB_FW_CODE	0

static void brcmf_usb_probe_phase2(struct device *dev, int ret,
				   struct brcmf_fw_request *fwreq)
{
	struct brcmf_bus *bus = dev_get_drvdata(dev);
	struct brcmf_usbdev_info *devinfo = bus->bus_priv.usb->devinfo;
	const struct firmware *fw;

	if (ret)
		goto error;

	brcmf_dbg(USB, "Start fw downloading\n");

	fw = fwreq->items[BRCMF_USB_FW_CODE].binary;
	kfree(fwreq);

	ret = check_file(fw->data);
	if (ret < 0) {
		brcmf_err("invalid firmware\n");
		release_firmware(fw);
		goto error;
	}

	devinfo->image = fw->data;
	devinfo->image_len = fw->size;

	ret = brcmf_usb_fw_download(devinfo);
	release_firmware(fw);
	if (ret)
		goto error;

	ret = brcmf_alloc(devinfo->dev, devinfo->settings);
	if (ret)
		goto error;

	/* Attach to the common driver interface */
	ret = brcmf_attach(devinfo->dev);
	if (ret)
		goto error;

	complete(&devinfo->dev_init_done);
	return;
error:
	brcmf_dbg(TRACE, "failed: dev=%s, err=%d\n", dev_name(dev), ret);
	complete(&devinfo->dev_init_done);
	device_release_driver(dev);
}

static struct brcmf_fw_request *
brcmf_usb_prepare_fw_request(struct brcmf_usbdev_info *devinfo)
{
	struct brcmf_fw_request *fwreq;
	struct brcmf_fw_name fwnames[] = {
		{ ".bin", devinfo->fw_name },
	};

	fwreq = brcmf_fw_alloc_request(devinfo->bus_pub.devid,
				       devinfo->bus_pub.chiprev,
				       brcmf_usb_fwnames,
				       ARRAY_SIZE(brcmf_usb_fwnames),
				       fwnames, ARRAY_SIZE(fwnames));
	if (!fwreq)
		return NULL;

	fwreq->items[BRCMF_USB_FW_CODE].type = BRCMF_FW_TYPE_BINARY;

	return fwreq;
}

static int brcmf_usb_probe_cb(struct brcmf_usbdev_info *devinfo,
			      enum brcmf_fwvendor fwvid)
{
	struct brcmf_bus *bus = NULL;
	struct brcmf_usbdev *bus_pub = NULL;
	struct device *dev = devinfo->dev;
	struct brcmf_fw_request *fwreq;
	int ret;

	brcmf_dbg(USB, "Enter\n");
	bus_pub = brcmf_usb_attach(devinfo, BRCMF_USB_NRXQ, BRCMF_USB_NTXQ);
	if (!bus_pub)
		return -ENODEV;

	bus = kzalloc(sizeof(struct brcmf_bus), GFP_ATOMIC);
	if (!bus) {
		ret = -ENOMEM;
		goto fail;
	}

	bus->dev = dev;
	bus_pub->bus = bus;
	bus->bus_priv.usb = bus_pub;
	dev_set_drvdata(dev, bus);
	bus->ops = &brcmf_usb_bus_ops;
	bus->proto_type = BRCMF_PROTO_BCDC;
	bus->fwvid = fwvid;
	bus->always_use_fws_queue = true;
#ifdef CONFIG_PM
	bus->wowl_supported = true;
#endif

	devinfo->settings = brcmf_get_module_param(bus->dev, BRCMF_BUSTYPE_USB,
						   bus_pub->devid,
						   bus_pub->chiprev);
	if (!devinfo->settings) {
		ret = -ENOMEM;
		goto fail;
	}

	if (!brcmf_usb_dlneeded(devinfo)) {
		ret = brcmf_alloc(devinfo->dev, devinfo->settings);
		if (ret)
			goto fail;
		ret = brcmf_attach(devinfo->dev);
		if (ret)
			goto fail;
		/* we are done */
		complete(&devinfo->dev_init_done);
		return 0;
	}
	bus->chip = bus_pub->devid;
	bus->chiprev = bus_pub->chiprev;

	fwreq = brcmf_usb_prepare_fw_request(devinfo);
	if (!fwreq) {
		ret = -ENOMEM;
		goto fail;
	}

	/* request firmware here */
	ret = brcmf_fw_get_firmwares(dev, fwreq, brcmf_usb_probe_phase2);
	if (ret) {
		brcmf_err("firmware request failed: %d\n", ret);
		kfree(fwreq);
		goto fail;
	}

	return 0;

fail:
	/* Release resources in reverse order */
	brcmf_free(devinfo->dev);
	kfree(bus);
	brcmf_usb_detach(devinfo);
	return ret;
}

static void
brcmf_usb_disconnect_cb(struct brcmf_usbdev_info *devinfo)
{
	if (!devinfo)
		return;
	brcmf_dbg(USB, "Enter, bus_pub %p\n", devinfo);

	brcmf_detach(devinfo->dev);
	brcmf_free(devinfo->dev);
	kfree(devinfo->bus_pub.bus);
	brcmf_usb_detach(devinfo);
}

/* Forward declaration for usb_match_id() call */
static const struct usb_device_id brcmf_usb_devid_table[];

static int
brcmf_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *usb = interface_to_usbdev(intf);
	struct brcmf_usbdev_info *devinfo;
	struct usb_interface_descriptor	*desc;
	struct usb_endpoint_descriptor *endpoint;
	int ret = 0;
	u32 num_of_eps;
	u8 endpoint_num, ep;

	if (!id) {
		id = usb_match_id(intf, brcmf_usb_devid_table);
		if (!id) {
			dev_err(&intf->dev, "Error could not find matching usb_device_id\n");
			return -ENODEV;
		}
	}

	brcmf_dbg(USB, "Enter 0x%04x:0x%04x\n", id->idVendor, id->idProduct);

	devinfo = kzalloc(sizeof(*devinfo), GFP_ATOMIC);
	if (devinfo == NULL)
		return -ENOMEM;

	devinfo->usbdev = usb;
	devinfo->dev = &usb->dev;
	/* Init completion, to protect for disconnect while still loading.
	 * Necessary because of the asynchronous firmware load construction
	 */
	init_completion(&devinfo->dev_init_done);

	usb_set_intfdata(intf, devinfo);

	intf->needs_remote_wakeup = 1;

	/* Check that the device supports only one configuration */
	if (usb->descriptor.bNumConfigurations != 1) {
		brcmf_err("Number of configurations: %d not supported\n",
			  usb->descriptor.bNumConfigurations);
		ret = -ENODEV;
		goto fail;
	}

	if ((usb->descriptor.bDeviceClass != USB_CLASS_VENDOR_SPEC) &&
	    (usb->descriptor.bDeviceClass != USB_CLASS_MISC) &&
	    (usb->descriptor.bDeviceClass != USB_CLASS_WIRELESS_CONTROLLER)) {
		brcmf_err("Device class: 0x%x not supported\n",
			  usb->descriptor.bDeviceClass);
		ret = -ENODEV;
		goto fail;
	}

	desc = &intf->cur_altsetting->desc;
	if ((desc->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
	    (desc->bInterfaceSubClass != 2) ||
	    (desc->bInterfaceProtocol != 0xff)) {
		brcmf_err("non WLAN interface %d: 0x%x:0x%x:0x%x\n",
			  desc->bInterfaceNumber, desc->bInterfaceClass,
			  desc->bInterfaceSubClass, desc->bInterfaceProtocol);
		ret = -ENODEV;
		goto fail;
	}

	num_of_eps = desc->bNumEndpoints;
	for (ep = 0; ep < num_of_eps; ep++) {
		endpoint = &intf->cur_altsetting->endpoint[ep].desc;
		endpoint_num = usb_endpoint_num(endpoint);
		if (!usb_endpoint_xfer_bulk(endpoint))
			continue;
		if (usb_endpoint_dir_in(endpoint)) {
			if (!devinfo->rx_pipe)
				devinfo->rx_pipe =
					usb_rcvbulkpipe(usb, endpoint_num);
		} else {
			if (!devinfo->tx_pipe)
				devinfo->tx_pipe =
					usb_sndbulkpipe(usb, endpoint_num);
		}
	}
	if (devinfo->rx_pipe == 0) {
		brcmf_err("No RX (in) Bulk EP found\n");
		ret = -ENODEV;
		goto fail;
	}
	if (devinfo->tx_pipe == 0) {
		brcmf_err("No TX (out) Bulk EP found\n");
		ret = -ENODEV;
		goto fail;
	}

	devinfo->ifnum = desc->bInterfaceNumber;

	if (usb->speed == USB_SPEED_SUPER_PLUS)
		brcmf_dbg(USB, "Broadcom super speed plus USB WLAN interface detected\n");
	else if (usb->speed == USB_SPEED_SUPER)
		brcmf_dbg(USB, "Broadcom super speed USB WLAN interface detected\n");
	else if (usb->speed == USB_SPEED_HIGH)
		brcmf_dbg(USB, "Broadcom high speed USB WLAN interface detected\n");
	else
		brcmf_dbg(USB, "Broadcom full speed USB WLAN interface detected\n");

	ret = brcmf_usb_probe_cb(devinfo, id->driver_info);
	if (ret)
		goto fail;

	/* Success */
	return 0;

fail:
	complete(&devinfo->dev_init_done);
	kfree(devinfo);
	usb_set_intfdata(intf, NULL);
	return ret;
}

static void
brcmf_usb_disconnect(struct usb_interface *intf)
{
	struct brcmf_usbdev_info *devinfo;

	brcmf_dbg(USB, "Enter\n");
	devinfo = (struct brcmf_usbdev_info *)usb_get_intfdata(intf);

	if (devinfo) {
		wait_for_completion(&devinfo->dev_init_done);
		/* Make sure that devinfo still exists. Firmware probe routines
		 * may have released the device and cleared the intfdata.
		 */
		if (!usb_get_intfdata(intf))
			goto done;

		brcmf_usb_disconnect_cb(devinfo);
		kfree(devinfo);
	}
done:
	brcmf_dbg(USB, "Exit\n");
}

/*
 * only need to signal the bus being down and update the state.
 */
static int brcmf_usb_suspend(struct usb_interface *intf, pm_message_t state)
{
	struct usb_device *usb = interface_to_usbdev(intf);
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(&usb->dev);

	brcmf_dbg(USB, "Enter\n");
	devinfo->bus_pub.state = BRCMFMAC_USB_STATE_SLEEP;
	brcmf_cancel_all_urbs(devinfo);
	device_set_wakeup_enable(devinfo->dev, true);
	return 0;
}

/*
 * (re-) start the bus.
 */
static int brcmf_usb_resume(struct usb_interface *intf)
{
	struct usb_device *usb = interface_to_usbdev(intf);
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(&usb->dev);

	brcmf_dbg(USB, "Enter\n");

	devinfo->bus_pub.state = BRCMFMAC_USB_STATE_UP;
	brcmf_usb_rx_fill_all(devinfo);
	device_set_wakeup_enable(devinfo->dev, false);
	return 0;
}

static int brcmf_usb_reset_resume(struct usb_interface *intf)
{
	struct usb_device *usb = interface_to_usbdev(intf);
	struct brcmf_usbdev_info *devinfo = brcmf_usb_get_businfo(&usb->dev);
	struct brcmf_fw_request *fwreq;
	int ret;

	brcmf_dbg(USB, "Enter\n");

	fwreq = brcmf_usb_prepare_fw_request(devinfo);
	if (!fwreq)
		return -ENOMEM;

	ret = brcmf_fw_get_firmwares(&usb->dev, fwreq, brcmf_usb_probe_phase2);
	if (ret < 0)
		kfree(fwreq);

	return ret;
}

#define BRCMF_USB_DEVICE(dev_id) \
	{ \
		USB_DEVICE(BRCM_USB_VENDOR_ID_BROADCOM, dev_id), \
		.driver_info = BRCMF_FWVENDOR_WCC \
	}

#define LINKSYS_USB_DEVICE(dev_id) \
	{ \
		USB_DEVICE(BRCM_USB_VENDOR_ID_LINKSYS, dev_id), \
		.driver_info = BRCMF_FWVENDOR_WCC \
	}

#define CYPRESS_USB_DEVICE(dev_id) \
	{ \
		USB_DEVICE(CY_USB_VENDOR_ID_CYPRESS, dev_id), \
		.driver_info = BRCMF_FWVENDOR_WCC \
	}

static const struct usb_device_id brcmf_usb_devid_table[] = {
	BRCMF_USB_DEVICE(BRCM_USB_43143_DEVICE_ID),
	BRCMF_USB_DEVICE(BRCM_USB_43236_DEVICE_ID),
	BRCMF_USB_DEVICE(BRCM_USB_43242_DEVICE_ID),
	BRCMF_USB_DEVICE(BRCM_USB_43569_DEVICE_ID),
	LINKSYS_USB_DEVICE(BRCM_USB_43235_LINKSYS_DEVICE_ID),
	CYPRESS_USB_DEVICE(CY_USB_4373_DEVICE_ID),
	{ USB_DEVICE(BRCM_USB_VENDOR_ID_LG, BRCM_USB_43242_LG_DEVICE_ID) },
	/* special entry for device with firmware loaded and running */
	BRCMF_USB_DEVICE(BRCM_USB_BCMFW_DEVICE_ID),
	CYPRESS_USB_DEVICE(BRCM_USB_BCMFW_DEVICE_ID),
	{ /* end: all zeroes */ }
};

MODULE_DEVICE_TABLE(usb, brcmf_usb_devid_table);

static struct usb_driver brcmf_usbdrvr = {
	.name = KBUILD_MODNAME,
	.probe = brcmf_usb_probe,
	.disconnect = brcmf_usb_disconnect,
	.id_table = brcmf_usb_devid_table,
	.suspend = brcmf_usb_suspend,
	.resume = brcmf_usb_resume,
	.reset_resume = brcmf_usb_reset_resume,
	.supports_autosuspend = true,
	.disable_hub_initiated_lpm = 1,
};

static int brcmf_usb_reset_device(struct device *dev, void *notused)
{
	/* device past is the usb interface so we
	 * need to use parent here.
	 */
	brcmf_dev_reset(dev->parent);
	return 0;
}

void brcmf_usb_exit(void)
{
	struct device_driver *drv = &brcmf_usbdrvr.drvwrap.driver;
	int ret;

	brcmf_dbg(USB, "Enter\n");
	ret = driver_for_each_device(drv, NULL, NULL,
				     brcmf_usb_reset_device);
	if (ret)
		brcmf_err("failed to reset all usb devices %d\n", ret);

	usb_deregister(&brcmf_usbdrvr);
}

int brcmf_usb_register(void)
{
	brcmf_dbg(USB, "Enter\n");
	return usb_register(&brcmf_usbdrvr);
}