summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
blob: 866e0230df25162855fd0353b4883fde9e992104 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
/*
 * USB Orinoco driver
 *
 * Copyright (c) 2003 Manuel Estrada Sainz
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License
 * at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and
 * limitations under the License.
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the MPL or the GPL.
 *
 * Queueing code based on linux-wlan-ng 0.2.1-pre5
 *
 * Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
 *
 *	The license is the same as above.
 *
 * Initialy based on USB Skeleton driver - 0.7
 *
 * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation; either version 2 of
 *	the License, or (at your option) any later version.
 *
 * NOTE: The original USB Skeleton driver is GPL, but all that code is
 * gone so MPL/GPL applies.
 */

#define DRIVER_NAME "orinoco_usb"
#define PFX DRIVER_NAME ": "

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/timer.h>

#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/wireless.h>
#include <linux/firmware.h>
#include <linux/refcount.h>

#include "mic.h"
#include "orinoco.h"

#ifndef URB_ASYNC_UNLINK
#define URB_ASYNC_UNLINK 0
#endif

struct header_struct {
	/* 802.3 */
	u8 dest[ETH_ALEN];
	u8 src[ETH_ALEN];
	__be16 len;
	/* 802.2 */
	u8 dsap;
	u8 ssap;
	u8 ctrl;
	/* SNAP */
	u8 oui[3];
	__be16 ethertype;
} __packed;

struct ez_usb_fw {
	u16 size;
	const u8 *code;
};

static struct ez_usb_fw firmware = {
	.size = 0,
	.code = NULL,
};

/* Debugging macros */
#undef err
#define err(format, arg...) \
	do { printk(KERN_ERR PFX format "\n", ## arg); } while (0)

MODULE_FIRMWARE("orinoco_ezusb_fw");

/*
 * Under some conditions, the card gets stuck and stops paying attention
 * to the world (i.e. data communication stalls) until we do something to
 * it.  Sending an INQ_TALLIES command seems to be enough and should be
 * harmless otherwise.  This behaviour has been observed when using the
 * driver on a systemimager client during installation.  In the past a
 * timer was used to send INQ_TALLIES commands when there was no other
 * activity, but it was troublesome and was removed.
 */

#define USB_COMPAQ_VENDOR_ID     0x049f /* Compaq Computer Corp. */
#define USB_COMPAQ_WL215_ID      0x001f /* Compaq WL215 USB Adapter */
#define USB_COMPAQ_W200_ID       0x0076 /* Compaq W200 USB Adapter */
#define USB_HP_WL215_ID          0x0082 /* Compaq WL215 USB Adapter */

#define USB_MELCO_VENDOR_ID      0x0411
#define USB_BUFFALO_L11_ID       0x0006 /* BUFFALO WLI-USB-L11 */
#define USB_BUFFALO_L11G_WR_ID   0x000B /* BUFFALO WLI-USB-L11G-WR */
#define USB_BUFFALO_L11G_ID      0x000D /* BUFFALO WLI-USB-L11G */

#define USB_LUCENT_VENDOR_ID     0x047E /* Lucent Technologies */
#define USB_LUCENT_ORINOCO_ID    0x0300 /* Lucent/Agere Orinoco USB Client */

#define USB_AVAYA8_VENDOR_ID     0x0D98
#define USB_AVAYAE_VENDOR_ID     0x0D9E
#define USB_AVAYA_WIRELESS_ID    0x0300 /* Avaya USB Wireless Card */

#define USB_AGERE_VENDOR_ID      0x0D4E /* Agere Systems */
#define USB_AGERE_MODEL0801_ID   0x1000 /* USB Wireless Card Model 0801 */
#define USB_AGERE_MODEL0802_ID   0x1001 /* USB Wireless Card Model 0802 */
#define USB_AGERE_REBRANDED_ID   0x047A /* USB WLAN Card */

#define USB_ELSA_VENDOR_ID       0x05CC
#define USB_ELSA_AIRLANCER_ID    0x3100 /* ELSA AirLancer USB-11 */

#define USB_LEGEND_VENDOR_ID     0x0E7C
#define USB_LEGEND_JOYNET_ID     0x0300 /* Joynet USB WLAN Card */

#define USB_SAMSUNG_VENDOR_ID    0x04E8
#define USB_SAMSUNG_SEW2001U1_ID 0x5002 /* Samsung SEW-2001u Card */
#define USB_SAMSUNG_SEW2001U2_ID 0x5B11 /* Samsung SEW-2001u Card */
#define USB_SAMSUNG_SEW2003U_ID  0x7011 /* Samsung SEW-2003U Card */

#define USB_IGATE_VENDOR_ID      0x0681
#define USB_IGATE_IGATE_11M_ID   0x0012 /* I-GATE 11M USB Card */

#define USB_FUJITSU_VENDOR_ID    0x0BF8
#define USB_FUJITSU_E1100_ID     0x1002 /* connect2AIR WLAN E-1100 USB */

#define USB_2WIRE_VENDOR_ID      0x1630
#define USB_2WIRE_WIRELESS_ID    0xff81 /* 2Wire USB Wireless adapter */


#define EZUSB_REQUEST_FW_TRANS		0xA0
#define EZUSB_REQUEST_TRIGGER		0xAA
#define EZUSB_REQUEST_TRIG_AC		0xAC
#define EZUSB_CPUCS_REG			0x7F92

#define EZUSB_RID_TX			0x0700
#define EZUSB_RID_RX			0x0701
#define EZUSB_RID_INIT1			0x0702
#define EZUSB_RID_ACK			0x0710
#define EZUSB_RID_READ_PDA		0x0800
#define EZUSB_RID_PROG_INIT		0x0852
#define EZUSB_RID_PROG_SET_ADDR		0x0853
#define EZUSB_RID_PROG_BYTES		0x0854
#define EZUSB_RID_PROG_END		0x0855
#define EZUSB_RID_DOCMD			0x0860

/* Recognize info frames */
#define EZUSB_IS_INFO(id)		((id >= 0xF000) && (id <= 0xF2FF))

#define EZUSB_MAGIC			0x0210

#define EZUSB_FRAME_DATA		1
#define EZUSB_FRAME_CONTROL		2

#define DEF_TIMEOUT			(3 * HZ)

#define BULK_BUF_SIZE			2048

#define MAX_DL_SIZE (BULK_BUF_SIZE - sizeof(struct ezusb_packet))

#define FW_BUF_SIZE			64
#define FW_VAR_OFFSET_PTR		0x359
#define FW_VAR_VALUE			0
#define FW_HOLE_START			0x100
#define FW_HOLE_END			0x300

struct ezusb_packet {
	__le16 magic;		/* 0x0210 */
	u8 req_reply_count;
	u8 ans_reply_count;
	__le16 frame_type;	/* 0x01 for data frames, 0x02 otherwise */
	__le16 size;		/* transport size */
	__le16 crc;		/* CRC up to here */
	__le16 hermes_len;
	__le16 hermes_rid;
	u8 data[];
} __packed;

/* Table of devices that work or may work with this driver */
static const struct usb_device_id ezusb_table[] = {
	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_COMPAQ_WL215_ID)},
	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_HP_WL215_ID)},
	{USB_DEVICE(USB_COMPAQ_VENDOR_ID, USB_COMPAQ_W200_ID)},
	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11_ID)},
	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11G_WR_ID)},
	{USB_DEVICE(USB_MELCO_VENDOR_ID, USB_BUFFALO_L11G_ID)},
	{USB_DEVICE(USB_LUCENT_VENDOR_ID, USB_LUCENT_ORINOCO_ID)},
	{USB_DEVICE(USB_AVAYA8_VENDOR_ID, USB_AVAYA_WIRELESS_ID)},
	{USB_DEVICE(USB_AVAYAE_VENDOR_ID, USB_AVAYA_WIRELESS_ID)},
	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_MODEL0801_ID)},
	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_MODEL0802_ID)},
	{USB_DEVICE(USB_ELSA_VENDOR_ID, USB_ELSA_AIRLANCER_ID)},
	{USB_DEVICE(USB_LEGEND_VENDOR_ID, USB_LEGEND_JOYNET_ID)},
	{USB_DEVICE_VER(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2001U1_ID,
			0, 0)},
	{USB_DEVICE(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2001U2_ID)},
	{USB_DEVICE(USB_SAMSUNG_VENDOR_ID, USB_SAMSUNG_SEW2003U_ID)},
	{USB_DEVICE(USB_IGATE_VENDOR_ID, USB_IGATE_IGATE_11M_ID)},
	{USB_DEVICE(USB_FUJITSU_VENDOR_ID, USB_FUJITSU_E1100_ID)},
	{USB_DEVICE(USB_2WIRE_VENDOR_ID, USB_2WIRE_WIRELESS_ID)},
	{USB_DEVICE(USB_AGERE_VENDOR_ID, USB_AGERE_REBRANDED_ID)},
	{}			/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, ezusb_table);

/* Structure to hold all of our device specific stuff */
struct ezusb_priv {
	struct usb_device *udev;
	struct net_device *dev;
	struct mutex mtx;
	spinlock_t req_lock;
	struct list_head req_pending;
	struct list_head req_active;
	spinlock_t reply_count_lock;
	u16 hermes_reg_fake[0x40];
	u8 *bap_buf;
	struct urb *read_urb;
	int read_pipe;
	int write_pipe;
	u8 reply_count;
};

enum ezusb_state {
	EZUSB_CTX_START,
	EZUSB_CTX_QUEUED,
	EZUSB_CTX_REQ_SUBMITTED,
	EZUSB_CTX_REQ_COMPLETE,
	EZUSB_CTX_RESP_RECEIVED,
	EZUSB_CTX_REQ_TIMEOUT,
	EZUSB_CTX_REQ_FAILED,
	EZUSB_CTX_RESP_TIMEOUT,
	EZUSB_CTX_REQSUBMIT_FAIL,
	EZUSB_CTX_COMPLETE,
};

struct request_context {
	struct list_head list;
	refcount_t refcount;
	struct completion done;	/* Signals that CTX is dead */
	int killed;
	struct urb *outurb;	/* OUT for req pkt */
	struct ezusb_priv *upriv;
	struct ezusb_packet *buf;
	int buf_length;
	struct timer_list timer;	/* Timeout handling */
	enum ezusb_state state;	/* Current state */
	/* the RID that we will wait for */
	u16 out_rid;
	u16 in_rid;
};


/* Forward declarations */
static void ezusb_ctx_complete(struct request_context *ctx);
static void ezusb_req_queue_run(struct ezusb_priv *upriv);
static void ezusb_bulk_in_callback(struct urb *urb);

static inline u8 ezusb_reply_inc(u8 count)
{
	if (count < 0x7F)
		return count + 1;
	else
		return 1;
}

static void ezusb_request_context_put(struct request_context *ctx)
{
	if (!refcount_dec_and_test(&ctx->refcount))
		return;

	WARN_ON(!ctx->done.done);
	BUG_ON(ctx->outurb->status == -EINPROGRESS);
	BUG_ON(timer_pending(&ctx->timer));
	usb_free_urb(ctx->outurb);
	kfree(ctx->buf);
	kfree(ctx);
}

static inline void ezusb_mod_timer(struct ezusb_priv *upriv,
				   struct timer_list *timer,
				   unsigned long expire)
{
	if (!upriv->udev)
		return;
	mod_timer(timer, expire);
}

static void ezusb_request_timerfn(struct timer_list *t)
{
	struct request_context *ctx = from_timer(ctx, t, timer);

	ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
	if (usb_unlink_urb(ctx->outurb) == -EINPROGRESS) {
		ctx->state = EZUSB_CTX_REQ_TIMEOUT;
	} else {
		ctx->state = EZUSB_CTX_RESP_TIMEOUT;
		dev_dbg(&ctx->outurb->dev->dev, "couldn't unlink\n");
		refcount_inc(&ctx->refcount);
		ctx->killed = 1;
		ezusb_ctx_complete(ctx);
		ezusb_request_context_put(ctx);
	}
};

static struct request_context *ezusb_alloc_ctx(struct ezusb_priv *upriv,
					       u16 out_rid, u16 in_rid)
{
	struct request_context *ctx;

	ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
	if (!ctx)
		return NULL;

	ctx->buf = kmalloc(BULK_BUF_SIZE, GFP_ATOMIC);
	if (!ctx->buf) {
		kfree(ctx);
		return NULL;
	}
	ctx->outurb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!ctx->outurb) {
		kfree(ctx->buf);
		kfree(ctx);
		return NULL;
	}

	ctx->upriv = upriv;
	ctx->state = EZUSB_CTX_START;
	ctx->out_rid = out_rid;
	ctx->in_rid = in_rid;

	refcount_set(&ctx->refcount, 1);
	init_completion(&ctx->done);

	timer_setup(&ctx->timer, ezusb_request_timerfn, 0);
	return ctx;
}

static void ezusb_ctx_complete(struct request_context *ctx)
{
	struct ezusb_priv *upriv = ctx->upriv;
	unsigned long flags;

	spin_lock_irqsave(&upriv->req_lock, flags);

	list_del_init(&ctx->list);
	if (upriv->udev) {
		spin_unlock_irqrestore(&upriv->req_lock, flags);
		ezusb_req_queue_run(upriv);
		spin_lock_irqsave(&upriv->req_lock, flags);
	}

	switch (ctx->state) {
	case EZUSB_CTX_COMPLETE:
	case EZUSB_CTX_REQSUBMIT_FAIL:
	case EZUSB_CTX_REQ_FAILED:
	case EZUSB_CTX_REQ_TIMEOUT:
	case EZUSB_CTX_RESP_TIMEOUT:
		spin_unlock_irqrestore(&upriv->req_lock, flags);

		if ((ctx->out_rid == EZUSB_RID_TX) && upriv->dev) {
			struct net_device *dev = upriv->dev;
			struct net_device_stats *stats = &dev->stats;

			if (ctx->state != EZUSB_CTX_COMPLETE)
				stats->tx_errors++;
			else
				stats->tx_packets++;

			netif_wake_queue(dev);
		}
		complete_all(&ctx->done);
		ezusb_request_context_put(ctx);
		break;

	default:
		spin_unlock_irqrestore(&upriv->req_lock, flags);
		if (!upriv->udev) {
			/* This is normal, as all request contexts get flushed
			 * when the device is disconnected */
			err("Called, CTX not terminating, but device gone");
			complete_all(&ctx->done);
			ezusb_request_context_put(ctx);
			break;
		}

		err("Called, CTX not in terminating state.");
		/* Things are really bad if this happens. Just leak
		 * the CTX because it may still be linked to the
		 * queue or the OUT urb may still be active.
		 * Just leaking at least prevents an Oops or Panic.
		 */
		break;
	}
}

/*
 * ezusb_req_queue_run:
 * Description:
 *	Note: Only one active CTX at any one time, because there's no
 *	other (reliable) way to match the response URB to the correct
 *	CTX.
 */
static void ezusb_req_queue_run(struct ezusb_priv *upriv)
{
	unsigned long flags;
	struct request_context *ctx;
	int result;

	spin_lock_irqsave(&upriv->req_lock, flags);

	if (!list_empty(&upriv->req_active))
		goto unlock;

	if (list_empty(&upriv->req_pending))
		goto unlock;

	ctx =
	    list_entry(upriv->req_pending.next, struct request_context,
		       list);

	if (!ctx->upriv->udev)
		goto unlock;

	/* We need to split this off to avoid a race condition */
	list_move_tail(&ctx->list, &upriv->req_active);

	if (ctx->state == EZUSB_CTX_QUEUED) {
		refcount_inc(&ctx->refcount);
		result = usb_submit_urb(ctx->outurb, GFP_ATOMIC);
		if (result) {
			ctx->state = EZUSB_CTX_REQSUBMIT_FAIL;

			spin_unlock_irqrestore(&upriv->req_lock, flags);

			err("Fatal, failed to submit command urb."
			    " error=%d\n", result);

			ezusb_ctx_complete(ctx);
			ezusb_request_context_put(ctx);
			goto done;
		}

		ctx->state = EZUSB_CTX_REQ_SUBMITTED;
		ezusb_mod_timer(ctx->upriv, &ctx->timer,
				jiffies + DEF_TIMEOUT);
	}

 unlock:
	spin_unlock_irqrestore(&upriv->req_lock, flags);

 done:
	return;
}

static void ezusb_req_enqueue_run(struct ezusb_priv *upriv,
				  struct request_context *ctx)
{
	unsigned long flags;

	spin_lock_irqsave(&upriv->req_lock, flags);

	if (!ctx->upriv->udev) {
		spin_unlock_irqrestore(&upriv->req_lock, flags);
		goto done;
	}
	refcount_inc(&ctx->refcount);
	list_add_tail(&ctx->list, &upriv->req_pending);
	spin_unlock_irqrestore(&upriv->req_lock, flags);

	ctx->state = EZUSB_CTX_QUEUED;
	ezusb_req_queue_run(upriv);

 done:
	return;
}

static void ezusb_request_out_callback(struct urb *urb)
{
	unsigned long flags;
	enum ezusb_state state;
	struct request_context *ctx = urb->context;
	struct ezusb_priv *upriv = ctx->upriv;

	spin_lock_irqsave(&upriv->req_lock, flags);

	del_timer(&ctx->timer);

	if (ctx->killed) {
		spin_unlock_irqrestore(&upriv->req_lock, flags);
		pr_warn("interrupt called with dead ctx\n");
		goto out;
	}

	state = ctx->state;

	if (urb->status == 0) {
		switch (state) {
		case EZUSB_CTX_REQ_SUBMITTED:
			if (ctx->in_rid) {
				ctx->state = EZUSB_CTX_REQ_COMPLETE;
				/* reply URB still pending */
				ezusb_mod_timer(upriv, &ctx->timer,
						jiffies + DEF_TIMEOUT);
				spin_unlock_irqrestore(&upriv->req_lock,
						       flags);
				break;
			}
			fallthrough;
		case EZUSB_CTX_RESP_RECEIVED:
			/* IN already received before this OUT-ACK */
			ctx->state = EZUSB_CTX_COMPLETE;
			spin_unlock_irqrestore(&upriv->req_lock, flags);
			ezusb_ctx_complete(ctx);
			break;

		default:
			spin_unlock_irqrestore(&upriv->req_lock, flags);
			err("Unexpected state(0x%x, %d) in OUT URB",
			    state, urb->status);
			break;
		}
	} else {
		/* If someone cancels the OUT URB then its status
		 * should be either -ECONNRESET or -ENOENT.
		 */
		switch (state) {
		case EZUSB_CTX_REQ_SUBMITTED:
		case EZUSB_CTX_RESP_RECEIVED:
			ctx->state = EZUSB_CTX_REQ_FAILED;
			fallthrough;

		case EZUSB_CTX_REQ_FAILED:
		case EZUSB_CTX_REQ_TIMEOUT:
			spin_unlock_irqrestore(&upriv->req_lock, flags);

			ezusb_ctx_complete(ctx);
			break;

		default:
			spin_unlock_irqrestore(&upriv->req_lock, flags);

			err("Unexpected state(0x%x, %d) in OUT URB",
			    state, urb->status);
			break;
		}
	}
 out:
	ezusb_request_context_put(ctx);
}

static void ezusb_request_in_callback(struct ezusb_priv *upriv,
				      struct urb *urb)
{
	struct ezusb_packet *ans = urb->transfer_buffer;
	struct request_context *ctx = NULL;
	enum ezusb_state state;
	unsigned long flags;

	/* Find the CTX on the active queue that requested this URB */
	spin_lock_irqsave(&upriv->req_lock, flags);
	if (upriv->udev) {
		struct list_head *item;

		list_for_each(item, &upriv->req_active) {
			struct request_context *c;
			int reply_count;

			c = list_entry(item, struct request_context, list);
			reply_count =
			    ezusb_reply_inc(c->buf->req_reply_count);
			if ((ans->ans_reply_count == reply_count)
			    && (le16_to_cpu(ans->hermes_rid) == c->in_rid)) {
				ctx = c;
				break;
			}
			netdev_dbg(upriv->dev, "Skipped (0x%x/0x%x) (%d/%d)\n",
				   le16_to_cpu(ans->hermes_rid), c->in_rid,
				   ans->ans_reply_count, reply_count);
		}
	}

	if (ctx == NULL) {
		spin_unlock_irqrestore(&upriv->req_lock, flags);
		err("%s: got unexpected RID: 0x%04X", __func__,
		    le16_to_cpu(ans->hermes_rid));
		ezusb_req_queue_run(upriv);
		return;
	}

	/* The data we want is in the in buffer, exchange */
	urb->transfer_buffer = ctx->buf;
	ctx->buf = (void *) ans;
	ctx->buf_length = urb->actual_length;

	state = ctx->state;
	switch (state) {
	case EZUSB_CTX_REQ_SUBMITTED:
		/* We have received our response URB before
		 * our request has been acknowledged. Do NOT
		 * destroy our CTX yet, because our OUT URB
		 * is still alive ...
		 */
		ctx->state = EZUSB_CTX_RESP_RECEIVED;
		spin_unlock_irqrestore(&upriv->req_lock, flags);

		/* Let the machine continue running. */
		break;

	case EZUSB_CTX_REQ_COMPLETE:
		/* This is the usual path: our request
		 * has already been acknowledged, and
		 * we have now received the reply.
		 */
		ctx->state = EZUSB_CTX_COMPLETE;

		/* Stop the intimer */
		del_timer(&ctx->timer);
		spin_unlock_irqrestore(&upriv->req_lock, flags);

		/* Call the completion handler */
		ezusb_ctx_complete(ctx);
		break;

	default:
		spin_unlock_irqrestore(&upriv->req_lock, flags);

		pr_warn("Matched IN URB, unexpected context state(0x%x)\n",
			state);
		/* Throw this CTX away and try submitting another */
		del_timer(&ctx->timer);
		ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
		usb_unlink_urb(ctx->outurb);
		ezusb_req_queue_run(upriv);
		break;
	}			/* switch */
}

typedef void (*ezusb_ctx_wait)(struct ezusb_priv *, struct request_context *);

static void ezusb_req_ctx_wait_compl(struct ezusb_priv *upriv,
				     struct request_context *ctx)
{
	switch (ctx->state) {
	case EZUSB_CTX_QUEUED:
	case EZUSB_CTX_REQ_SUBMITTED:
	case EZUSB_CTX_REQ_COMPLETE:
	case EZUSB_CTX_RESP_RECEIVED:
		wait_for_completion(&ctx->done);
		break;
	default:
		/* Done or failed - nothing to wait for */
		break;
	}
}

static void ezusb_req_ctx_wait_poll(struct ezusb_priv *upriv,
				    struct request_context *ctx)
{
	int msecs;

	switch (ctx->state) {
	case EZUSB_CTX_QUEUED:
	case EZUSB_CTX_REQ_SUBMITTED:
	case EZUSB_CTX_REQ_COMPLETE:
	case EZUSB_CTX_RESP_RECEIVED:
		/* If we get called from a timer or with our lock acquired, then
		 * we can't wait for the completion and have to poll. This won't
		 * happen if the USB controller completes the URB requests in
		 * BH.
		 */
		msecs = DEF_TIMEOUT * (1000 / HZ);

		while (!try_wait_for_completion(&ctx->done) && msecs--)
			udelay(1000);
		break;
	default:
		/* Done or failed - nothing to wait for */
		break;
	}
}

static void ezusb_req_ctx_wait_skip(struct ezusb_priv *upriv,
				    struct request_context *ctx)
{
	WARN(1, "Shouldn't be invoked for in_rid\n");
}

static inline u16 build_crc(struct ezusb_packet *data)
{
	u16 crc = 0;
	u8 *bytes = (u8 *)data;
	int i;

	for (i = 0; i < 8; i++)
		crc = (crc << 1) + bytes[i];

	return crc;
}

/*
 * ezusb_fill_req:
 *
 * if data == NULL and length > 0 the data is assumed to be already in
 * the target buffer and only the header is filled.
 *
 */
static int ezusb_fill_req(struct ezusb_packet *req, u16 length, u16 rid,
			  const void *data, u16 frame_type, u8 reply_count)
{
	int total_size = sizeof(*req) + length;

	BUG_ON(total_size > BULK_BUF_SIZE);

	req->magic = cpu_to_le16(EZUSB_MAGIC);
	req->req_reply_count = reply_count;
	req->ans_reply_count = 0;
	req->frame_type = cpu_to_le16(frame_type);
	req->size = cpu_to_le16(length + 4);
	req->crc = cpu_to_le16(build_crc(req));
	req->hermes_len = cpu_to_le16(HERMES_BYTES_TO_RECLEN(length));
	req->hermes_rid = cpu_to_le16(rid);
	if (data)
		memcpy(req->data, data, length);
	return total_size;
}

static int ezusb_submit_in_urb(struct ezusb_priv *upriv)
{
	int retval = 0;
	void *cur_buf = upriv->read_urb->transfer_buffer;

	if (upriv->read_urb->status == -EINPROGRESS) {
		netdev_dbg(upriv->dev, "urb busy, not resubmiting\n");
		retval = -EBUSY;
		goto exit;
	}
	usb_fill_bulk_urb(upriv->read_urb, upriv->udev, upriv->read_pipe,
			  cur_buf, BULK_BUF_SIZE,
			  ezusb_bulk_in_callback, upriv);
	upriv->read_urb->transfer_flags = 0;
	retval = usb_submit_urb(upriv->read_urb, GFP_ATOMIC);
	if (retval)
		err("%s submit failed %d", __func__, retval);

 exit:
	return retval;
}

static inline int ezusb_8051_cpucs(struct ezusb_priv *upriv, int reset)
{
	int ret;
	u8 *res_val = NULL;

	if (!upriv->udev) {
		err("%s: !upriv->udev", __func__);
		return -EFAULT;
	}

	res_val = kmalloc(sizeof(*res_val), GFP_KERNEL);

	if (!res_val)
		return -ENOMEM;

	*res_val = reset;	/* avoid argument promotion */

	ret =  usb_control_msg(upriv->udev,
			       usb_sndctrlpipe(upriv->udev, 0),
			       EZUSB_REQUEST_FW_TRANS,
			       USB_TYPE_VENDOR | USB_RECIP_DEVICE |
			       USB_DIR_OUT, EZUSB_CPUCS_REG, 0, res_val,
			       sizeof(*res_val), DEF_TIMEOUT);

	kfree(res_val);

	return ret;
}

static int ezusb_firmware_download(struct ezusb_priv *upriv,
				   struct ez_usb_fw *fw)
{
	u8 *fw_buffer;
	int retval, addr;
	int variant_offset;

	fw_buffer = kmalloc(FW_BUF_SIZE, GFP_KERNEL);
	if (!fw_buffer) {
		printk(KERN_ERR PFX "Out of memory for firmware buffer.\n");
		return -ENOMEM;
	}
	/*
	 * This byte is 1 and should be replaced with 0.  The offset is
	 * 0x10AD in version 0.0.6.  The byte in question should follow
	 * the end of the code pointed to by the jump in the beginning
	 * of the firmware.  Also, it is read by code located at 0x358.
	 */
	variant_offset = be16_to_cpup((__be16 *) &fw->code[FW_VAR_OFFSET_PTR]);
	if (variant_offset >= fw->size) {
		printk(KERN_ERR PFX "Invalid firmware variant offset: "
		       "0x%04x\n", variant_offset);
		retval = -EINVAL;
		goto fail;
	}

	retval = ezusb_8051_cpucs(upriv, 1);
	if (retval < 0)
		goto fail;
	for (addr = 0; addr < fw->size; addr += FW_BUF_SIZE) {
		/* 0x100-0x300 should be left alone, it contains card
		 * specific data, like USB enumeration information */
		if ((addr >= FW_HOLE_START) && (addr < FW_HOLE_END))
			continue;

		memcpy(fw_buffer, &fw->code[addr], FW_BUF_SIZE);
		if (variant_offset >= addr &&
		    variant_offset < addr + FW_BUF_SIZE) {
			netdev_dbg(upriv->dev,
				   "Patching card_variant byte at 0x%04X\n",
				   variant_offset);
			fw_buffer[variant_offset - addr] = FW_VAR_VALUE;
		}
		retval = usb_control_msg(upriv->udev,
					 usb_sndctrlpipe(upriv->udev, 0),
					 EZUSB_REQUEST_FW_TRANS,
					 USB_TYPE_VENDOR | USB_RECIP_DEVICE
					 | USB_DIR_OUT,
					 addr, 0x0,
					 fw_buffer, FW_BUF_SIZE,
					 DEF_TIMEOUT);

		if (retval < 0)
			goto fail;
	}
	retval = ezusb_8051_cpucs(upriv, 0);
	if (retval < 0)
		goto fail;

	goto exit;
 fail:
	printk(KERN_ERR PFX "Firmware download failed, error %d\n",
	       retval);
 exit:
	kfree(fw_buffer);
	return retval;
}

static int ezusb_access_ltv(struct ezusb_priv *upriv,
			    struct request_context *ctx,
			    u16 length, const void *data, u16 frame_type,
			    void *ans_buff, unsigned ans_size, u16 *ans_length,
			    ezusb_ctx_wait ezusb_ctx_wait_func)
{
	int req_size;
	int retval = 0;
	enum ezusb_state state;

	if (!upriv->udev) {
		retval = -ENODEV;
		goto exit;
	}

	if (upriv->read_urb->status != -EINPROGRESS)
		err("%s: in urb not pending", __func__);

	/* protect upriv->reply_count, guarantee sequential numbers */
	spin_lock_bh(&upriv->reply_count_lock);
	req_size = ezusb_fill_req(ctx->buf, length, ctx->out_rid, data,
				  frame_type, upriv->reply_count);
	usb_fill_bulk_urb(ctx->outurb, upriv->udev, upriv->write_pipe,
			  ctx->buf, req_size,
			  ezusb_request_out_callback, ctx);

	if (ctx->in_rid)
		upriv->reply_count = ezusb_reply_inc(upriv->reply_count);

	ezusb_req_enqueue_run(upriv, ctx);

	spin_unlock_bh(&upriv->reply_count_lock);

	if (ctx->in_rid)
		ezusb_ctx_wait_func(upriv, ctx);

	state = ctx->state;
	switch (state) {
	case EZUSB_CTX_COMPLETE:
		retval = ctx->outurb->status;
		break;

	case EZUSB_CTX_QUEUED:
	case EZUSB_CTX_REQ_SUBMITTED:
		if (!ctx->in_rid)
			break;
		fallthrough;
	default:
		err("%s: Unexpected context state %d", __func__,
		    state);
		fallthrough;
	case EZUSB_CTX_REQ_TIMEOUT:
	case EZUSB_CTX_REQ_FAILED:
	case EZUSB_CTX_RESP_TIMEOUT:
	case EZUSB_CTX_REQSUBMIT_FAIL:
		printk(KERN_ERR PFX "Access failed, resetting (state %d,"
		       " reply_count %d)\n", state, upriv->reply_count);
		upriv->reply_count = 0;
		if (state == EZUSB_CTX_REQ_TIMEOUT
		    || state == EZUSB_CTX_RESP_TIMEOUT) {
			printk(KERN_ERR PFX "ctx timed out\n");
			retval = -ETIMEDOUT;
		} else {
			printk(KERN_ERR PFX "ctx failed\n");
			retval = -EFAULT;
		}
		goto exit;
	}
	if (ctx->in_rid) {
		struct ezusb_packet *ans = ctx->buf;
		unsigned exp_len;

		if (ans->hermes_len != 0)
			exp_len = le16_to_cpu(ans->hermes_len) * 2 + 12;
		else
			exp_len = 14;

		if (exp_len != ctx->buf_length) {
			err("%s: length mismatch for RID 0x%04x: "
			    "expected %d, got %d", __func__,
			    ctx->in_rid, exp_len, ctx->buf_length);
			retval = -EIO;
			goto exit;
		}

		if (ans_buff)
			memcpy(ans_buff, ans->data, min(exp_len, ans_size));
		if (ans_length)
			*ans_length = le16_to_cpu(ans->hermes_len);
	}
 exit:
	ezusb_request_context_put(ctx);
	return retval;
}

static int __ezusb_write_ltv(struct hermes *hw, int bap, u16 rid,
			   u16 length, const void *data,
			   ezusb_ctx_wait ezusb_ctx_wait_func)
{
	struct ezusb_priv *upriv = hw->priv;
	u16 frame_type;
	struct request_context *ctx;

	if (length == 0)
		return -EINVAL;

	length = HERMES_RECLEN_TO_BYTES(length);

	/* On memory mapped devices HERMES_RID_CNFGROUPADDRESSES can be
	 * set to be empty, but the USB bridge doesn't like it */
	if (length == 0)
		return 0;

	ctx = ezusb_alloc_ctx(upriv, rid, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	if (rid == EZUSB_RID_TX)
		frame_type = EZUSB_FRAME_DATA;
	else
		frame_type = EZUSB_FRAME_CONTROL;

	return ezusb_access_ltv(upriv, ctx, length, data, frame_type,
				NULL, 0, NULL, ezusb_ctx_wait_func);
}

static int ezusb_write_ltv(struct hermes *hw, int bap, u16 rid,
			   u16 length, const void *data)
{
	return __ezusb_write_ltv(hw, bap, rid, length, data,
				 ezusb_req_ctx_wait_poll);
}

static int __ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
			    unsigned bufsize, u16 *length, void *buf,
			    ezusb_ctx_wait ezusb_ctx_wait_func)

{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;

	if (bufsize % 2)
		return -EINVAL;

	ctx = ezusb_alloc_ctx(upriv, rid, rid);
	if (!ctx)
		return -ENOMEM;

	return ezusb_access_ltv(upriv, ctx, 0, NULL, EZUSB_FRAME_CONTROL,
				buf, bufsize, length, ezusb_req_ctx_wait_poll);
}

static int ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
			    unsigned bufsize, u16 *length, void *buf)
{
	return __ezusb_read_ltv(hw, bap, rid, bufsize, length, buf,
				ezusb_req_ctx_wait_poll);
}

static int ezusb_read_ltv_preempt(struct hermes *hw, int bap, u16 rid,
				  unsigned bufsize, u16 *length, void *buf)
{
	return __ezusb_read_ltv(hw, bap, rid, bufsize, length, buf,
				ezusb_req_ctx_wait_compl);
}

static int ezusb_doicmd_wait(struct hermes *hw, u16 cmd, u16 parm0, u16 parm1,
			     u16 parm2, struct hermes_response *resp)
{
	WARN_ON_ONCE(1);
	return -EINVAL;
}

static int __ezusb_docmd_wait(struct hermes *hw, u16 cmd, u16 parm0,
			    struct hermes_response *resp,
			    ezusb_ctx_wait ezusb_ctx_wait_func)
{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;

	__le16 data[4] = {
		cpu_to_le16(cmd),
		cpu_to_le16(parm0),
		0,
		0,
	};
	netdev_dbg(upriv->dev, "0x%04X, parm0 0x%04X\n", cmd, parm0);
	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_DOCMD, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	return ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
				EZUSB_FRAME_CONTROL, NULL, 0, NULL,
				ezusb_ctx_wait_func);
}

static int ezusb_docmd_wait(struct hermes *hw, u16 cmd, u16 parm0,
			    struct hermes_response *resp)
{
	return __ezusb_docmd_wait(hw, cmd, parm0, resp, ezusb_req_ctx_wait_poll);
}

static int ezusb_bap_pread(struct hermes *hw, int bap,
			   void *buf, int len, u16 id, u16 offset)
{
	struct ezusb_priv *upriv = hw->priv;
	struct ezusb_packet *ans = (void *) upriv->read_urb->transfer_buffer;
	int actual_length = upriv->read_urb->actual_length;

	if (id == EZUSB_RID_RX) {
		if ((sizeof(*ans) + offset + len) > actual_length) {
			printk(KERN_ERR PFX "BAP read beyond buffer end "
			       "in rx frame\n");
			return -EINVAL;
		}
		memcpy(buf, ans->data + offset, len);
		return 0;
	}

	if (EZUSB_IS_INFO(id)) {
		/* Include 4 bytes for length/type */
		if ((sizeof(*ans) + offset + len - 4) > actual_length) {
			printk(KERN_ERR PFX "BAP read beyond buffer end "
			       "in info frame\n");
			return -EFAULT;
		}
		memcpy(buf, ans->data + offset - 4, len);
	} else {
		printk(KERN_ERR PFX "Unexpected fid 0x%04x\n", id);
		return -EINVAL;
	}

	return 0;
}

static int ezusb_read_pda(struct hermes *hw, __le16 *pda,
			  u32 pda_addr, u16 pda_len)
{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;
	__le16 data[] = {
		cpu_to_le16(pda_addr & 0xffff),
		cpu_to_le16(pda_len - 4)
	};
	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_READ_PDA, EZUSB_RID_READ_PDA);
	if (!ctx)
		return -ENOMEM;

	/* wl_lkm does not include PDA size in the PDA area.
	 * We will pad the information into pda, so other routines
	 * don't have to be modified */
	pda[0] = cpu_to_le16(pda_len - 2);
	/* Includes CFG_PROD_DATA but not itself */
	pda[1] = cpu_to_le16(0x0800); /* CFG_PROD_DATA */

	return ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
				EZUSB_FRAME_CONTROL, &pda[2], pda_len - 4,
				NULL, ezusb_req_ctx_wait_compl);
}

static int ezusb_program_init(struct hermes *hw, u32 entry_point)
{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;
	__le32 data = cpu_to_le32(entry_point);

	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_PROG_INIT, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	return ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
				EZUSB_FRAME_CONTROL, NULL, 0, NULL,
				ezusb_req_ctx_wait_compl);
}

static int ezusb_program_end(struct hermes *hw)
{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;

	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_PROG_END, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	return ezusb_access_ltv(upriv, ctx, 0, NULL,
				EZUSB_FRAME_CONTROL, NULL, 0, NULL,
				ezusb_req_ctx_wait_compl);
}

static int ezusb_program_bytes(struct hermes *hw, const char *buf,
			       u32 addr, u32 len)
{
	struct ezusb_priv *upriv = hw->priv;
	struct request_context *ctx;
	__le32 data = cpu_to_le32(addr);
	int err;

	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_PROG_SET_ADDR, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	err = ezusb_access_ltv(upriv, ctx, sizeof(data), &data,
			       EZUSB_FRAME_CONTROL, NULL, 0, NULL,
			       ezusb_req_ctx_wait_compl);
	if (err)
		return err;

	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_PROG_BYTES, EZUSB_RID_ACK);
	if (!ctx)
		return -ENOMEM;

	return ezusb_access_ltv(upriv, ctx, len, buf,
				EZUSB_FRAME_CONTROL, NULL, 0, NULL,
				ezusb_req_ctx_wait_compl);
}

static int ezusb_program(struct hermes *hw, const char *buf,
			 u32 addr, u32 len)
{
	u32 ch_addr;
	u32 ch_len;
	int err = 0;

	/* We can only send 2048 bytes out of the bulk xmit at a time,
	 * so we have to split any programming into chunks of <2048
	 * bytes. */

	ch_len = (len < MAX_DL_SIZE) ? len : MAX_DL_SIZE;
	ch_addr = addr;

	while (ch_addr < (addr + len)) {
		pr_debug("Programming subblock of length %d "
			 "to address 0x%08x. Data @ %p\n",
			 ch_len, ch_addr, &buf[ch_addr - addr]);

		err = ezusb_program_bytes(hw, &buf[ch_addr - addr],
					  ch_addr, ch_len);
		if (err)
			break;

		ch_addr += ch_len;
		ch_len = ((addr + len - ch_addr) < MAX_DL_SIZE) ?
			(addr + len - ch_addr) : MAX_DL_SIZE;
	}

	return err;
}

static netdev_tx_t ezusb_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct orinoco_private *priv = ndev_priv(dev);
	struct net_device_stats *stats = &dev->stats;
	struct ezusb_priv *upriv = priv->card;
	u8 mic[MICHAEL_MIC_LEN + 1];
	int err = 0;
	int tx_control;
	unsigned long flags;
	struct request_context *ctx;
	u8 *buf;
	int tx_size;

	if (!netif_running(dev)) {
		printk(KERN_ERR "%s: Tx on stopped device!\n",
		       dev->name);
		return NETDEV_TX_BUSY;
	}

	if (netif_queue_stopped(dev)) {
		printk(KERN_DEBUG "%s: Tx while transmitter busy!\n",
		       dev->name);
		return NETDEV_TX_BUSY;
	}

	if (orinoco_lock(priv, &flags) != 0) {
		printk(KERN_ERR
		       "%s: ezusb_xmit() called while hw_unavailable\n",
		       dev->name);
		return NETDEV_TX_BUSY;
	}

	if (!netif_carrier_ok(dev) ||
	    (priv->iw_mode == NL80211_IFTYPE_MONITOR)) {
		/* Oops, the firmware hasn't established a connection,
		   silently drop the packet (this seems to be the
		   safest approach). */
		goto drop;
	}

	/* Check packet length */
	if (skb->len < ETH_HLEN)
		goto drop;

	tx_control = 0;

	err = orinoco_process_xmit_skb(skb, dev, priv, &tx_control,
				       &mic[0]);
	if (err)
		goto drop;

	ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_TX, 0);
	if (!ctx)
		goto drop;

	memset(ctx->buf, 0, BULK_BUF_SIZE);
	buf = ctx->buf->data;

	{
		__le16 *tx_cntl = (__le16 *)buf;
		*tx_cntl = cpu_to_le16(tx_control);
		buf += sizeof(*tx_cntl);
	}

	memcpy(buf, skb->data, skb->len);
	buf += skb->len;

	if (tx_control & HERMES_TXCTRL_MIC) {
		u8 *m = mic;
		/* Mic has been offset so it can be copied to an even
		 * address. We're copying eveything anyway, so we
		 * don't need to copy that first byte. */
		if (skb->len % 2)
			m++;
		memcpy(buf, m, MICHAEL_MIC_LEN);
		buf += MICHAEL_MIC_LEN;
	}

	/* Finally, we actually initiate the send */
	netif_stop_queue(dev);

	/* The card may behave better if we send evenly sized usb transfers */
	tx_size = ALIGN(buf - ctx->buf->data, 2);

	err = ezusb_access_ltv(upriv, ctx, tx_size, NULL,
			       EZUSB_FRAME_DATA, NULL, 0, NULL,
			       ezusb_req_ctx_wait_skip);

	if (err) {
		netif_start_queue(dev);
		if (net_ratelimit())
			printk(KERN_ERR "%s: Error %d transmitting packet\n",
				dev->name, err);
		goto busy;
	}

	netif_trans_update(dev);
	stats->tx_bytes += skb->len;
	goto ok;

 drop:
	stats->tx_errors++;
	stats->tx_dropped++;

 ok:
	orinoco_unlock(priv, &flags);
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;

 busy:
	orinoco_unlock(priv, &flags);
	return NETDEV_TX_BUSY;
}

static int ezusb_allocate(struct hermes *hw, u16 size, u16 *fid)
{
	*fid = EZUSB_RID_TX;
	return 0;
}


static int ezusb_hard_reset(struct orinoco_private *priv)
{
	struct ezusb_priv *upriv = priv->card;
	int retval = ezusb_8051_cpucs(upriv, 1);

	if (retval < 0) {
		err("Failed to reset");
		return retval;
	}

	retval = ezusb_8051_cpucs(upriv, 0);
	if (retval < 0) {
		err("Failed to unreset");
		return retval;
	}

	netdev_dbg(upriv->dev, "sending control message\n");
	retval = usb_control_msg(upriv->udev,
				 usb_sndctrlpipe(upriv->udev, 0),
				 EZUSB_REQUEST_TRIGGER,
				 USB_TYPE_VENDOR | USB_RECIP_DEVICE |
				 USB_DIR_OUT, 0x0, 0x0, NULL, 0,
				 DEF_TIMEOUT);
	if (retval < 0) {
		err("EZUSB_REQUEST_TRIGGER failed retval %d", retval);
		return retval;
	}
#if 0
	dbg("Sending EZUSB_REQUEST_TRIG_AC");
	retval = usb_control_msg(upriv->udev,
				 usb_sndctrlpipe(upriv->udev, 0),
				 EZUSB_REQUEST_TRIG_AC,
				 USB_TYPE_VENDOR | USB_RECIP_DEVICE |
				 USB_DIR_OUT, 0x00FA, 0x0, NULL, 0,
				 DEF_TIMEOUT);
	if (retval < 0) {
		err("EZUSB_REQUEST_TRIG_AC failed retval %d", retval);
		return retval;
	}
#endif

	return 0;
}


static int ezusb_init(struct hermes *hw)
{
	struct ezusb_priv *upriv = hw->priv;
	int retval;

	if (!upriv)
		return -EINVAL;

	upriv->reply_count = 0;
	/* Write the MAGIC number on the simulated registers to keep
	 * orinoco.c happy */
	hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);
	hermes_write_regn(hw, RXFID, EZUSB_RID_RX);

	usb_kill_urb(upriv->read_urb);
	ezusb_submit_in_urb(upriv);

	retval = __ezusb_write_ltv(hw, 0, EZUSB_RID_INIT1,
				 HERMES_BYTES_TO_RECLEN(2), "\x10\x00",
				 ezusb_req_ctx_wait_compl);
	if (retval < 0) {
		printk(KERN_ERR PFX "EZUSB_RID_INIT1 error %d\n", retval);
		return retval;
	}

	retval = __ezusb_docmd_wait(hw, HERMES_CMD_INIT, 0, NULL,
				    ezusb_req_ctx_wait_compl);
	if (retval < 0) {
		printk(KERN_ERR PFX "HERMES_CMD_INIT error %d\n", retval);
		return retval;
	}

	return 0;
}

static void ezusb_bulk_in_callback(struct urb *urb)
{
	struct ezusb_priv *upriv = (struct ezusb_priv *) urb->context;
	struct ezusb_packet *ans = urb->transfer_buffer;
	u16 crc;
	u16 hermes_rid;

	if (upriv->udev == NULL)
		return;

	if (urb->status == -ETIMEDOUT) {
		/* When a device gets unplugged we get this every time
		 * we resubmit, flooding the logs.  Since we don't use
		 * USB timeouts, it shouldn't happen any other time*/
		pr_warn("%s: urb timed out, not resubmitting\n", __func__);
		return;
	}
	if (urb->status == -ECONNABORTED) {
		pr_warn("%s: connection abort, resubmitting urb\n",
			__func__);
		goto resubmit;
	}
	if ((urb->status == -EILSEQ)
	    || (urb->status == -ENOENT)
	    || (urb->status == -ECONNRESET)) {
		netdev_dbg(upriv->dev, "status %d, not resubmiting\n",
			   urb->status);
		return;
	}
	if (urb->status)
		netdev_dbg(upriv->dev, "status: %d length: %d\n",
			   urb->status, urb->actual_length);
	if (urb->actual_length < sizeof(*ans)) {
		err("%s: short read, ignoring", __func__);
		goto resubmit;
	}
	crc = build_crc(ans);
	if (le16_to_cpu(ans->crc) != crc) {
		err("CRC error, ignoring packet");
		goto resubmit;
	}

	hermes_rid = le16_to_cpu(ans->hermes_rid);
	if ((hermes_rid != EZUSB_RID_RX) && !EZUSB_IS_INFO(hermes_rid)) {
		ezusb_request_in_callback(upriv, urb);
	} else if (upriv->dev) {
		struct net_device *dev = upriv->dev;
		struct orinoco_private *priv = ndev_priv(dev);
		struct hermes *hw = &priv->hw;

		if (hermes_rid == EZUSB_RID_RX) {
			__orinoco_ev_rx(dev, hw);
		} else {
			hermes_write_regn(hw, INFOFID,
					  le16_to_cpu(ans->hermes_rid));
			__orinoco_ev_info(dev, hw);
		}
	}

 resubmit:
	if (upriv->udev)
		ezusb_submit_in_urb(upriv);
}

static inline void ezusb_delete(struct ezusb_priv *upriv)
{
	struct list_head *item;
	struct list_head *tmp_item;
	unsigned long flags;

	BUG_ON(!upriv);

	mutex_lock(&upriv->mtx);

	upriv->udev = NULL;	/* No timer will be rearmed from here */

	usb_kill_urb(upriv->read_urb);

	spin_lock_irqsave(&upriv->req_lock, flags);
	list_for_each_safe(item, tmp_item, &upriv->req_active) {
		struct request_context *ctx;
		int err;

		ctx = list_entry(item, struct request_context, list);
		refcount_inc(&ctx->refcount);

		ctx->outurb->transfer_flags |= URB_ASYNC_UNLINK;
		err = usb_unlink_urb(ctx->outurb);

		spin_unlock_irqrestore(&upriv->req_lock, flags);
		if (err == -EINPROGRESS)
			wait_for_completion(&ctx->done);

		del_timer_sync(&ctx->timer);
		/* FIXME: there is an slight chance for the irq handler to
		 * be running */
		if (!list_empty(&ctx->list))
			ezusb_ctx_complete(ctx);

		ezusb_request_context_put(ctx);
		spin_lock_irqsave(&upriv->req_lock, flags);
	}
	spin_unlock_irqrestore(&upriv->req_lock, flags);

	list_for_each_safe(item, tmp_item, &upriv->req_pending)
	    ezusb_ctx_complete(list_entry(item,
					  struct request_context, list));

	if (upriv->read_urb && upriv->read_urb->status == -EINPROGRESS)
		printk(KERN_ERR PFX "Some URB in progress\n");

	mutex_unlock(&upriv->mtx);

	if (upriv->read_urb) {
		kfree(upriv->read_urb->transfer_buffer);
		usb_free_urb(upriv->read_urb);
	}
	kfree(upriv->bap_buf);
	if (upriv->dev) {
		struct orinoco_private *priv = ndev_priv(upriv->dev);
		orinoco_if_del(priv);
		wiphy_unregister(priv_to_wiphy(upriv));
		free_orinocodev(priv);
	}
}

static void ezusb_lock_irqsave(spinlock_t *lock,
			       unsigned long *flags) __acquires(lock)
{
	spin_lock_bh(lock);
}

static void ezusb_unlock_irqrestore(spinlock_t *lock,
				    unsigned long *flags) __releases(lock)
{
	spin_unlock_bh(lock);
}

static void ezusb_lock_irq(spinlock_t *lock) __acquires(lock)
{
	spin_lock_bh(lock);
}

static void ezusb_unlock_irq(spinlock_t *lock) __releases(lock)
{
	spin_unlock_bh(lock);
}

static const struct hermes_ops ezusb_ops = {
	.init = ezusb_init,
	.cmd_wait = ezusb_docmd_wait,
	.init_cmd_wait = ezusb_doicmd_wait,
	.allocate = ezusb_allocate,
	.read_ltv = ezusb_read_ltv,
	.read_ltv_pr = ezusb_read_ltv_preempt,
	.write_ltv = ezusb_write_ltv,
	.bap_pread = ezusb_bap_pread,
	.read_pda = ezusb_read_pda,
	.program_init = ezusb_program_init,
	.program_end = ezusb_program_end,
	.program = ezusb_program,
	.lock_irqsave = ezusb_lock_irqsave,
	.unlock_irqrestore = ezusb_unlock_irqrestore,
	.lock_irq = ezusb_lock_irq,
	.unlock_irq = ezusb_unlock_irq,
};

static const struct net_device_ops ezusb_netdev_ops = {
	.ndo_open		= orinoco_open,
	.ndo_stop		= orinoco_stop,
	.ndo_start_xmit		= ezusb_xmit,
	.ndo_set_rx_mode	= orinoco_set_multicast_list,
	.ndo_change_mtu		= orinoco_change_mtu,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_tx_timeout		= orinoco_tx_timeout,
};

static int ezusb_probe(struct usb_interface *interface,
		       const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(interface);
	struct orinoco_private *priv;
	struct hermes *hw;
	struct ezusb_priv *upriv = NULL;
	struct usb_interface_descriptor *iface_desc;
	struct usb_endpoint_descriptor *ep;
	const struct firmware *fw_entry = NULL;
	int retval = 0;
	int i;

	priv = alloc_orinocodev(sizeof(*upriv), &udev->dev,
				ezusb_hard_reset, NULL);
	if (!priv) {
		err("Couldn't allocate orinocodev");
		retval = -ENOMEM;
		goto exit;
	}

	hw = &priv->hw;

	upriv = priv->card;

	mutex_init(&upriv->mtx);
	spin_lock_init(&upriv->reply_count_lock);

	spin_lock_init(&upriv->req_lock);
	INIT_LIST_HEAD(&upriv->req_pending);
	INIT_LIST_HEAD(&upriv->req_active);

	upriv->udev = udev;

	hw->iobase = (void __force __iomem *) &upriv->hermes_reg_fake;
	hw->reg_spacing = HERMES_16BIT_REGSPACING;
	hw->priv = upriv;
	hw->ops = &ezusb_ops;

	/* set up the endpoint information */
	/* check out the endpoints */

	iface_desc = &interface->cur_altsetting->desc;
	for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
		ep = &interface->cur_altsetting->endpoint[i].desc;

		if (usb_endpoint_is_bulk_in(ep)) {
			/* we found a bulk in endpoint */
			if (upriv->read_urb != NULL) {
				pr_warn("Found a second bulk in ep, ignored\n");
				continue;
			}

			upriv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
			if (!upriv->read_urb)
				goto error;
			if (le16_to_cpu(ep->wMaxPacketSize) != 64)
				pr_warn("bulk in: wMaxPacketSize!= 64\n");
			if (ep->bEndpointAddress != (2 | USB_DIR_IN))
				pr_warn("bulk in: bEndpointAddress: %d\n",
					ep->bEndpointAddress);
			upriv->read_pipe = usb_rcvbulkpipe(udev,
							 ep->
							 bEndpointAddress);
			upriv->read_urb->transfer_buffer =
			    kmalloc(BULK_BUF_SIZE, GFP_KERNEL);
			if (!upriv->read_urb->transfer_buffer) {
				err("Couldn't allocate IN buffer");
				goto error;
			}
		}

		if (usb_endpoint_is_bulk_out(ep)) {
			/* we found a bulk out endpoint */
			if (upriv->bap_buf != NULL) {
				pr_warn("Found a second bulk out ep, ignored\n");
				continue;
			}

			if (le16_to_cpu(ep->wMaxPacketSize) != 64)
				pr_warn("bulk out: wMaxPacketSize != 64\n");
			if (ep->bEndpointAddress != 2)
				pr_warn("bulk out: bEndpointAddress: %d\n",
					ep->bEndpointAddress);
			upriv->write_pipe = usb_sndbulkpipe(udev,
							  ep->
							  bEndpointAddress);
			upriv->bap_buf = kmalloc(BULK_BUF_SIZE, GFP_KERNEL);
			if (!upriv->bap_buf) {
				err("Couldn't allocate bulk_out_buffer");
				goto error;
			}
		}
	}
	if (!upriv->bap_buf || !upriv->read_urb) {
		err("Didn't find the required bulk endpoints");
		goto error;
	}

	if (request_firmware(&fw_entry, "orinoco_ezusb_fw",
			     &interface->dev) == 0) {
		firmware.size = fw_entry->size;
		firmware.code = fw_entry->data;
	}
	if (firmware.size && firmware.code) {
		if (ezusb_firmware_download(upriv, &firmware) < 0)
			goto error;
	} else {
		err("No firmware to download");
		goto error;
	}

	if (ezusb_hard_reset(priv) < 0) {
		err("Cannot reset the device");
		goto error;
	}

	/* If the firmware is already downloaded orinoco.c will call
	 * ezusb_init but if the firmware is not already there, that will make
	 * the kernel very unstable, so we try initializing here and quit in
	 * case of error */
	if (ezusb_init(hw) < 0) {
		err("Couldn't initialize the device");
		err("Firmware may not be downloaded or may be wrong.");
		goto error;
	}

	/* Initialise the main driver */
	if (orinoco_init(priv) != 0) {
		err("orinoco_init() failed\n");
		goto error;
	}

	if (orinoco_if_add(priv, 0, 0, &ezusb_netdev_ops) != 0) {
		upriv->dev = NULL;
		err("%s: orinoco_if_add() failed", __func__);
		wiphy_unregister(priv_to_wiphy(priv));
		goto error;
	}
	upriv->dev = priv->ndev;

	goto exit;

 error:
	ezusb_delete(upriv);
	if (upriv->dev) {
		/* upriv->dev was 0, so ezusb_delete() didn't free it */
		free_orinocodev(priv);
	}
	upriv = NULL;
	retval = -EFAULT;
 exit:
	if (fw_entry) {
		firmware.code = NULL;
		firmware.size = 0;
		release_firmware(fw_entry);
	}
	usb_set_intfdata(interface, upriv);
	return retval;
}


static void ezusb_disconnect(struct usb_interface *intf)
{
	struct ezusb_priv *upriv = usb_get_intfdata(intf);
	usb_set_intfdata(intf, NULL);
	ezusb_delete(upriv);
	printk(KERN_INFO PFX "Disconnected\n");
}


/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver orinoco_driver = {
	.name = DRIVER_NAME,
	.probe = ezusb_probe,
	.disconnect = ezusb_disconnect,
	.id_table = ezusb_table,
	.disable_hub_initiated_lpm = 1,
};

module_usb_driver(orinoco_driver);

MODULE_AUTHOR("Manuel Estrada Sainz");
MODULE_DESCRIPTION("Driver for Orinoco wireless LAN cards using EZUSB bridge");
MODULE_LICENSE("Dual MPL/GPL");