summaryrefslogtreecommitdiffstats
path: root/drivers/usb/storage/shuttle_usbat.c
blob: 3b0294e4df93d935de3b9e82e6697aa64bf2d8a2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
/*
 * Driver for SCM Microsystems (a.k.a. Shuttle) USB-ATAPI cable
 *
 * Current development and maintenance by:
 *   (c) 2000, 2001 Robert Baruch (autophile@starband.net)
 *   (c) 2004, 2005 Daniel Drake <dsd@gentoo.org>
 *
 * Developed with the assistance of:
 *   (c) 2002 Alan Stern <stern@rowland.org>
 *
 * Flash support based on earlier work by:
 *   (c) 2002 Thomas Kreiling <usbdev@sm04.de>
 *
 * Many originally ATAPI devices were slightly modified to meet the USB
 * market by using some kind of translation from ATAPI to USB on the host,
 * and the peripheral would translate from USB back to ATAPI.
 *
 * SCM Microsystems (www.scmmicro.com) makes a device, sold to OEM's only, 
 * which does the USB-to-ATAPI conversion.  By obtaining the data sheet on
 * their device under nondisclosure agreement, I have been able to write
 * this driver for Linux.
 *
 * The chip used in the device can also be used for EPP and ISA translation
 * as well. This driver is only guaranteed to work with the ATAPI
 * translation.
 *
 * See the Kconfig help text for a list of devices known to be supported by
 * this driver.
 *
 * 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, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/cdrom.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "scsiglue.h"

#define DRV_NAME "ums-usbat"

MODULE_DESCRIPTION("Driver for SCM Microsystems (a.k.a. Shuttle) USB-ATAPI cable");
MODULE_AUTHOR("Daniel Drake <dsd@gentoo.org>, Robert Baruch <autophile@starband.net>");
MODULE_LICENSE("GPL");

/* Supported device types */
#define USBAT_DEV_HP8200	0x01
#define USBAT_DEV_FLASH		0x02

#define USBAT_EPP_PORT		0x10
#define USBAT_EPP_REGISTER	0x30
#define USBAT_ATA		0x40
#define USBAT_ISA		0x50

/* Commands (need to be logically OR'd with an access type */
#define USBAT_CMD_READ_REG		0x00
#define USBAT_CMD_WRITE_REG		0x01
#define USBAT_CMD_READ_BLOCK	0x02
#define USBAT_CMD_WRITE_BLOCK	0x03
#define USBAT_CMD_COND_READ_BLOCK	0x04
#define USBAT_CMD_COND_WRITE_BLOCK	0x05
#define USBAT_CMD_WRITE_REGS	0x07

/* Commands (these don't need an access type) */
#define USBAT_CMD_EXEC_CMD	0x80
#define USBAT_CMD_SET_FEAT	0x81
#define USBAT_CMD_UIO		0x82

/* Methods of accessing UIO register */
#define USBAT_UIO_READ	1
#define USBAT_UIO_WRITE	0

/* Qualifier bits */
#define USBAT_QUAL_FCQ	0x20	/* full compare */
#define USBAT_QUAL_ALQ	0x10	/* auto load subcount */

/* USBAT Flash Media status types */
#define USBAT_FLASH_MEDIA_NONE	0
#define USBAT_FLASH_MEDIA_CF	1

/* USBAT Flash Media change types */
#define USBAT_FLASH_MEDIA_SAME	0
#define USBAT_FLASH_MEDIA_CHANGED	1

/* USBAT ATA registers */
#define USBAT_ATA_DATA      0x10  /* read/write data (R/W) */
#define USBAT_ATA_FEATURES  0x11  /* set features (W) */
#define USBAT_ATA_ERROR     0x11  /* error (R) */
#define USBAT_ATA_SECCNT    0x12  /* sector count (R/W) */
#define USBAT_ATA_SECNUM    0x13  /* sector number (R/W) */
#define USBAT_ATA_LBA_ME    0x14  /* cylinder low (R/W) */
#define USBAT_ATA_LBA_HI    0x15  /* cylinder high (R/W) */
#define USBAT_ATA_DEVICE    0x16  /* head/device selection (R/W) */
#define USBAT_ATA_STATUS    0x17  /* device status (R) */
#define USBAT_ATA_CMD       0x17  /* device command (W) */
#define USBAT_ATA_ALTSTATUS 0x0E  /* status (no clear IRQ) (R) */

/* USBAT User I/O Data registers */
#define USBAT_UIO_EPAD		0x80 /* Enable Peripheral Control Signals */
#define USBAT_UIO_CDT		0x40 /* Card Detect (Read Only) */
				     /* CDT = ACKD & !UI1 & !UI0 */
#define USBAT_UIO_1		0x20 /* I/O 1 */
#define USBAT_UIO_0		0x10 /* I/O 0 */
#define USBAT_UIO_EPP_ATA	0x08 /* 1=EPP mode, 0=ATA mode */
#define USBAT_UIO_UI1		0x04 /* Input 1 */
#define USBAT_UIO_UI0		0x02 /* Input 0 */
#define USBAT_UIO_INTR_ACK	0x01 /* Interrupt (ATA/ISA)/Acknowledge (EPP) */

/* USBAT User I/O Enable registers */
#define USBAT_UIO_DRVRST	0x80 /* Reset Peripheral */
#define USBAT_UIO_ACKD		0x40 /* Enable Card Detect */
#define USBAT_UIO_OE1		0x20 /* I/O 1 set=output/clr=input */
				     /* If ACKD=1, set OE1 to 1 also. */
#define USBAT_UIO_OE0		0x10 /* I/O 0 set=output/clr=input */
#define USBAT_UIO_ADPRST	0x01 /* Reset SCM chip */

/* USBAT Features */
#define USBAT_FEAT_ETEN	0x80	/* External trigger enable */
#define USBAT_FEAT_U1	0x08
#define USBAT_FEAT_U0	0x04
#define USBAT_FEAT_ET1	0x02
#define USBAT_FEAT_ET2	0x01

struct usbat_info {
	int devicetype;

	/* Used for Flash readers only */
	unsigned long sectors;     /* total sector count */
	unsigned long ssize;       /* sector size in bytes */

	unsigned char sense_key;
	unsigned long sense_asc;   /* additional sense code */
	unsigned long sense_ascq;  /* additional sense code qualifier */
};

#define short_pack(LSB,MSB) ( ((u16)(LSB)) | ( ((u16)(MSB))<<8 ) )
#define LSB_of(s) ((s)&0xFF)
#define MSB_of(s) ((s)>>8)

static int transferred = 0;

static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us);
static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us);

static int init_usbat_cd(struct us_data *us);
static int init_usbat_flash(struct us_data *us);


/*
 * The table of devices
 */
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
		    vendorName, productName, useProtocol, useTransport, \
		    initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  .driver_info = (flags) }

static struct usb_device_id usbat_usb_ids[] = {
#	include "unusual_usbat.h"
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usbat_usb_ids);

#undef UNUSUAL_DEV

/*
 * The flags table
 */
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
		    vendor_name, product_name, use_protocol, use_transport, \
		    init_function, Flags) \
{ \
	.vendorName = vendor_name,	\
	.productName = product_name,	\
	.useProtocol = use_protocol,	\
	.useTransport = use_transport,	\
	.initFunction = init_function,	\
}

static struct us_unusual_dev usbat_unusual_dev_list[] = {
#	include "unusual_usbat.h"
	{ }		/* Terminating entry */
};

#undef UNUSUAL_DEV

/*
 * Convenience function to produce an ATA read/write sectors command
 * Use cmd=0x20 for read, cmd=0x30 for write
 */
static void usbat_pack_ata_sector_cmd(unsigned char *buf,
					unsigned char thistime,
					u32 sector, unsigned char cmd)
{
	buf[0] = 0;
	buf[1] = thistime;
	buf[2] = sector & 0xFF;
	buf[3] = (sector >>  8) & 0xFF;
	buf[4] = (sector >> 16) & 0xFF;
	buf[5] = 0xE0 | ((sector >> 24) & 0x0F);
	buf[6] = cmd;
}

/*
 * Convenience function to get the device type (flash or hp8200)
 */
static int usbat_get_device_type(struct us_data *us)
{
	return ((struct usbat_info*)us->extra)->devicetype;
}

/*
 * Read a register from the device
 */
static int usbat_read(struct us_data *us,
		      unsigned char access,
		      unsigned char reg,
		      unsigned char *content)
{
	return usb_stor_ctrl_transfer(us,
		us->recv_ctrl_pipe,
		access | USBAT_CMD_READ_REG,
		0xC0,
		(u16)reg,
		0,
		content,
		1);
}

/*
 * Write to a register on the device
 */
static int usbat_write(struct us_data *us,
		       unsigned char access,
		       unsigned char reg,
		       unsigned char content)
{
	return usb_stor_ctrl_transfer(us,
		us->send_ctrl_pipe,
		access | USBAT_CMD_WRITE_REG,
		0x40,
		short_pack(reg, content),
		0,
		NULL,
		0);
}

/*
 * Convenience function to perform a bulk read
 */
static int usbat_bulk_read(struct us_data *us,
			   void* buf,
			   unsigned int len,
			   int use_sg)
{
	if (len == 0)
		return USB_STOR_XFER_GOOD;

	usb_stor_dbg(us, "len = %d\n", len);
	return usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe, buf, len, use_sg, NULL);
}

/*
 * Convenience function to perform a bulk write
 */
static int usbat_bulk_write(struct us_data *us,
			    void* buf,
			    unsigned int len,
			    int use_sg)
{
	if (len == 0)
		return USB_STOR_XFER_GOOD;

	usb_stor_dbg(us, "len = %d\n", len);
	return usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe, buf, len, use_sg, NULL);
}

/*
 * Some USBAT-specific commands can only be executed over a command transport
 * This transport allows one (len=8) or two (len=16) vendor-specific commands
 * to be executed.
 */
static int usbat_execute_command(struct us_data *us,
								 unsigned char *commands,
								 unsigned int len)
{
	return usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
								  USBAT_CMD_EXEC_CMD, 0x40, 0, 0,
								  commands, len);
}

/*
 * Read the status register
 */
static int usbat_get_status(struct us_data *us, unsigned char *status)
{
	int rc;
	rc = usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status);

	usb_stor_dbg(us, "0x%02X\n", *status);
	return rc;
}

/*
 * Check the device status
 */
static int usbat_check_status(struct us_data *us)
{
	unsigned char *reply = us->iobuf;
	int rc;

	rc = usbat_get_status(us, reply);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_FAILED;

	/* error/check condition (0x51 is ok) */
	if (*reply & 0x01 && *reply != 0x51)
		return USB_STOR_TRANSPORT_FAILED;

	/* device fault */
	if (*reply & 0x20)
		return USB_STOR_TRANSPORT_FAILED;

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Stores critical information in internal registers in preparation for the execution
 * of a conditional usbat_read_blocks or usbat_write_blocks call.
 */
static int usbat_set_shuttle_features(struct us_data *us,
				      unsigned char external_trigger,
				      unsigned char epp_control,
				      unsigned char mask_byte,
				      unsigned char test_pattern,
				      unsigned char subcountH,
				      unsigned char subcountL)
{
	unsigned char *command = us->iobuf;

	command[0] = 0x40;
	command[1] = USBAT_CMD_SET_FEAT;

	/*
	 * The only bit relevant to ATA access is bit 6
	 * which defines 8 bit data access (set) or 16 bit (unset)
	 */
	command[2] = epp_control;

	/*
	 * If FCQ is set in the qualifier (defined in R/W cmd), then bits U0, U1,
	 * ET1 and ET2 define an external event to be checked for on event of a
	 * _read_blocks or _write_blocks operation. The read/write will not take
	 * place unless the defined trigger signal is active.
	 */
	command[3] = external_trigger;

	/*
	 * The resultant byte of the mask operation (see mask_byte) is compared for
	 * equivalence with this test pattern. If equal, the read/write will take
	 * place.
	 */
	command[4] = test_pattern;

	/*
	 * This value is logically ANDed with the status register field specified
	 * in the read/write command.
	 */
	command[5] = mask_byte;

	/*
	 * If ALQ is set in the qualifier, this field contains the address of the
	 * registers where the byte count should be read for transferring the data.
	 * If ALQ is not set, then this field contains the number of bytes to be
	 * transferred.
	 */
	command[6] = subcountL;
	command[7] = subcountH;

	return usbat_execute_command(us, command, 8);
}

/*
 * Block, waiting for an ATA device to become not busy or to report
 * an error condition.
 */
static int usbat_wait_not_busy(struct us_data *us, int minutes)
{
	int i;
	int result;
	unsigned char *status = us->iobuf;

	/*
	 * Synchronizing cache on a CDR could take a heck of a long time,
	 * but probably not more than 10 minutes or so. On the other hand,
	 * doing a full blank on a CDRW at speed 1 will take about 75
	 * minutes!
	 */

	for (i=0; i<1200+minutes*60; i++) {

 		result = usbat_get_status(us, status);

		if (result!=USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;
		if (*status & 0x01) { /* check condition */
			result = usbat_read(us, USBAT_ATA, 0x10, status);
			return USB_STOR_TRANSPORT_FAILED;
		}
		if (*status & 0x20) /* device fault */
			return USB_STOR_TRANSPORT_FAILED;

		if ((*status & 0x80)==0x00) { /* not busy */
			usb_stor_dbg(us, "Waited not busy for %d steps\n", i);
			return USB_STOR_TRANSPORT_GOOD;
		}

		if (i<500)
			msleep(10); /* 5 seconds */
		else if (i<700)
			msleep(50); /* 10 seconds */
		else if (i<1200)
			msleep(100); /* 50 seconds */
		else
			msleep(1000); /* X minutes */
	}

	usb_stor_dbg(us, "Waited not busy for %d minutes, timing out\n",
		     minutes);
	return USB_STOR_TRANSPORT_FAILED;
}

/*
 * Read block data from the data register
 */
static int usbat_read_block(struct us_data *us,
			    void* buf,
			    unsigned short len,
			    int use_sg)
{
	int result;
	unsigned char *command = us->iobuf;

	if (!len)
		return USB_STOR_TRANSPORT_GOOD;

	command[0] = 0xC0;
	command[1] = USBAT_ATA | USBAT_CMD_READ_BLOCK;
	command[2] = USBAT_ATA_DATA;
	command[3] = 0;
	command[4] = 0;
	command[5] = 0;
	command[6] = LSB_of(len);
	command[7] = MSB_of(len);

	result = usbat_execute_command(us, command, 8);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	result = usbat_bulk_read(us, buf, len, use_sg);
	return (result == USB_STOR_XFER_GOOD ?
			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
}

/*
 * Write block data via the data register
 */
static int usbat_write_block(struct us_data *us,
			     unsigned char access,
			     void* buf,
			     unsigned short len,
			     int minutes,
			     int use_sg)
{
	int result;
	unsigned char *command = us->iobuf;

	if (!len)
		return USB_STOR_TRANSPORT_GOOD;

	command[0] = 0x40;
	command[1] = access | USBAT_CMD_WRITE_BLOCK;
	command[2] = USBAT_ATA_DATA;
	command[3] = 0;
	command[4] = 0;
	command[5] = 0;
	command[6] = LSB_of(len);
	command[7] = MSB_of(len);

	result = usbat_execute_command(us, command, 8);

	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	result = usbat_bulk_write(us, buf, len, use_sg);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	return usbat_wait_not_busy(us, minutes);
}

/*
 * Process read and write requests
 */
static int usbat_hp8200e_rw_block_test(struct us_data *us,
				       unsigned char access,
				       unsigned char *registers,
				       unsigned char *data_out,
				       unsigned short num_registers,
				       unsigned char data_reg,
				       unsigned char status_reg,
				       unsigned char timeout,
				       unsigned char qualifier,
				       int direction,
				       void *buf,
				       unsigned short len,
				       int use_sg,
				       int minutes)
{
	int result;
	unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
			us->recv_bulk_pipe : us->send_bulk_pipe;

	unsigned char *command = us->iobuf;
	int i, j;
	int cmdlen;
	unsigned char *data = us->iobuf;
	unsigned char *status = us->iobuf;

	BUG_ON(num_registers > US_IOBUF_SIZE/2);

	for (i=0; i<20; i++) {

		/*
		 * The first time we send the full command, which consists
		 * of downloading the SCSI command followed by downloading
		 * the data via a write-and-test.  Any other time we only
		 * send the command to download the data -- the SCSI command
		 * is still 'active' in some sense in the device.
		 * 
		 * We're only going to try sending the data 10 times. After
		 * that, we just return a failure.
		 */

		if (i==0) {
			cmdlen = 16;
			/*
			 * Write to multiple registers
			 * Not really sure the 0x07, 0x17, 0xfc, 0xe7 is
			 * necessary here, but that's what came out of the
			 * trace every single time.
			 */
			command[0] = 0x40;
			command[1] = access | USBAT_CMD_WRITE_REGS;
			command[2] = 0x07;
			command[3] = 0x17;
			command[4] = 0xFC;
			command[5] = 0xE7;
			command[6] = LSB_of(num_registers*2);
			command[7] = MSB_of(num_registers*2);
		} else
			cmdlen = 8;

		/* Conditionally read or write blocks */
		command[cmdlen-8] = (direction==DMA_TO_DEVICE ? 0x40 : 0xC0);
		command[cmdlen-7] = access |
				(direction==DMA_TO_DEVICE ?
				 USBAT_CMD_COND_WRITE_BLOCK : USBAT_CMD_COND_READ_BLOCK);
		command[cmdlen-6] = data_reg;
		command[cmdlen-5] = status_reg;
		command[cmdlen-4] = timeout;
		command[cmdlen-3] = qualifier;
		command[cmdlen-2] = LSB_of(len);
		command[cmdlen-1] = MSB_of(len);

		result = usbat_execute_command(us, command, cmdlen);

		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (i==0) {

			for (j=0; j<num_registers; j++) {
				data[j<<1] = registers[j];
				data[1+(j<<1)] = data_out[j];
			}

			result = usbat_bulk_write(us, data, num_registers*2, 0);
			if (result != USB_STOR_XFER_GOOD)
				return USB_STOR_TRANSPORT_ERROR;

		}

		result = usb_stor_bulk_transfer_sg(us,
			pipe, buf, len, use_sg, NULL);

		/*
		 * If we get a stall on the bulk download, we'll retry
		 * the bulk download -- but not the SCSI command because
		 * in some sense the SCSI command is still 'active' and
		 * waiting for the data. Don't ask me why this should be;
		 * I'm only following what the Windoze driver did.
		 *
		 * Note that a stall for the test-and-read/write command means
		 * that the test failed. In this case we're testing to make
		 * sure that the device is error-free
		 * (i.e. bit 0 -- CHK -- of status is 0). The most likely
		 * hypothesis is that the USBAT chip somehow knows what
		 * the device will accept, but doesn't give the device any
		 * data until all data is received. Thus, the device would
		 * still be waiting for the first byte of data if a stall
		 * occurs, even if the stall implies that some data was
		 * transferred.
		 */

		if (result == USB_STOR_XFER_SHORT ||
				result == USB_STOR_XFER_STALLED) {

			/*
			 * If we're reading and we stalled, then clear
			 * the bulk output pipe only the first time.
			 */

			if (direction==DMA_FROM_DEVICE && i==0) {
				if (usb_stor_clear_halt(us,
						us->send_bulk_pipe) < 0)
					return USB_STOR_TRANSPORT_ERROR;
			}

			/*
			 * Read status: is the device angry, or just busy?
			 */

 			result = usbat_read(us, USBAT_ATA, 
				direction==DMA_TO_DEVICE ?
					USBAT_ATA_STATUS : USBAT_ATA_ALTSTATUS,
				status);

			if (result!=USB_STOR_XFER_GOOD)
				return USB_STOR_TRANSPORT_ERROR;
			if (*status & 0x01) /* check condition */
				return USB_STOR_TRANSPORT_FAILED;
			if (*status & 0x20) /* device fault */
				return USB_STOR_TRANSPORT_FAILED;

			usb_stor_dbg(us, "Redoing %s\n",
				     direction == DMA_TO_DEVICE
				     ? "write" : "read");

		} else if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;
		else
			return usbat_wait_not_busy(us, minutes);

	}

	usb_stor_dbg(us, "Bummer! %s bulk data 20 times failed\n",
		     direction == DMA_TO_DEVICE ? "Writing" : "Reading");

	return USB_STOR_TRANSPORT_FAILED;
}

/*
 * Write to multiple registers:
 * Allows us to write specific data to any registers. The data to be written
 * gets packed in this sequence: reg0, data0, reg1, data1, ..., regN, dataN
 * which gets sent through bulk out.
 * Not designed for large transfers of data!
 */
static int usbat_multiple_write(struct us_data *us,
				unsigned char *registers,
				unsigned char *data_out,
				unsigned short num_registers)
{
	int i, result;
	unsigned char *data = us->iobuf;
	unsigned char *command = us->iobuf;

	BUG_ON(num_registers > US_IOBUF_SIZE/2);

	/* Write to multiple registers, ATA access */
	command[0] = 0x40;
	command[1] = USBAT_ATA | USBAT_CMD_WRITE_REGS;

	/* No relevance */
	command[2] = 0;
	command[3] = 0;
	command[4] = 0;
	command[5] = 0;

	/* Number of bytes to be transferred (incl. addresses and data) */
	command[6] = LSB_of(num_registers*2);
	command[7] = MSB_of(num_registers*2);

	/* The setup command */
	result = usbat_execute_command(us, command, 8);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	/* Create the reg/data, reg/data sequence */
	for (i=0; i<num_registers; i++) {
		data[i<<1] = registers[i];
		data[1+(i<<1)] = data_out[i];
	}

	/* Send the data */
	result = usbat_bulk_write(us, data, num_registers*2, 0);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	if (usbat_get_device_type(us) == USBAT_DEV_HP8200)
		return usbat_wait_not_busy(us, 0);
	else
		return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Conditionally read blocks from device:
 * Allows us to read blocks from a specific data register, based upon the
 * condition that a status register can be successfully masked with a status
 * qualifier. If this condition is not initially met, the read will wait
 * up until a maximum amount of time has elapsed, as specified by timeout.
 * The read will start when the condition is met, otherwise the command aborts.
 *
 * The qualifier defined here is not the value that is masked, it defines
 * conditions for the write to take place. The actual masked qualifier (and
 * other related details) are defined beforehand with _set_shuttle_features().
 */
static int usbat_read_blocks(struct us_data *us,
			     void* buffer,
			     int len,
			     int use_sg)
{
	int result;
	unsigned char *command = us->iobuf;

	command[0] = 0xC0;
	command[1] = USBAT_ATA | USBAT_CMD_COND_READ_BLOCK;
	command[2] = USBAT_ATA_DATA;
	command[3] = USBAT_ATA_STATUS;
	command[4] = 0xFD; /* Timeout (ms); */
	command[5] = USBAT_QUAL_FCQ;
	command[6] = LSB_of(len);
	command[7] = MSB_of(len);

	/* Multiple block read setup command */
	result = usbat_execute_command(us, command, 8);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_FAILED;
	
	/* Read the blocks we just asked for */
	result = usbat_bulk_read(us, buffer, len, use_sg);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_FAILED;

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Conditionally write blocks to device:
 * Allows us to write blocks to a specific data register, based upon the
 * condition that a status register can be successfully masked with a status
 * qualifier. If this condition is not initially met, the write will wait
 * up until a maximum amount of time has elapsed, as specified by timeout.
 * The read will start when the condition is met, otherwise the command aborts.
 *
 * The qualifier defined here is not the value that is masked, it defines
 * conditions for the write to take place. The actual masked qualifier (and
 * other related details) are defined beforehand with _set_shuttle_features().
 */
static int usbat_write_blocks(struct us_data *us,
			      void* buffer,
			      int len,
			      int use_sg)
{
	int result;
	unsigned char *command = us->iobuf;

	command[0] = 0x40;
	command[1] = USBAT_ATA | USBAT_CMD_COND_WRITE_BLOCK;
	command[2] = USBAT_ATA_DATA;
	command[3] = USBAT_ATA_STATUS;
	command[4] = 0xFD; /* Timeout (ms) */
	command[5] = USBAT_QUAL_FCQ;
	command[6] = LSB_of(len);
	command[7] = MSB_of(len);

	/* Multiple block write setup command */
	result = usbat_execute_command(us, command, 8);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_FAILED;
	
	/* Write the data */
	result = usbat_bulk_write(us, buffer, len, use_sg);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_FAILED;

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Read the User IO register
 */
static int usbat_read_user_io(struct us_data *us, unsigned char *data_flags)
{
	int result;

	result = usb_stor_ctrl_transfer(us,
		us->recv_ctrl_pipe,
		USBAT_CMD_UIO,
		0xC0,
		0,
		0,
		data_flags,
		USBAT_UIO_READ);

	usb_stor_dbg(us, "UIO register reads %02X\n", *data_flags);

	return result;
}

/*
 * Write to the User IO register
 */
static int usbat_write_user_io(struct us_data *us,
			       unsigned char enable_flags,
			       unsigned char data_flags)
{
	return usb_stor_ctrl_transfer(us,
		us->send_ctrl_pipe,
		USBAT_CMD_UIO,
		0x40,
		short_pack(enable_flags, data_flags),
		0,
		NULL,
		USBAT_UIO_WRITE);
}

/*
 * Reset the device
 * Often needed on media change.
 */
static int usbat_device_reset(struct us_data *us)
{
	int rc;

	/*
	 * Reset peripheral, enable peripheral control signals
	 * (bring reset signal up)
	 */
	rc = usbat_write_user_io(us,
							 USBAT_UIO_DRVRST | USBAT_UIO_OE1 | USBAT_UIO_OE0,
							 USBAT_UIO_EPAD | USBAT_UIO_1);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;
			
	/*
	 * Enable peripheral control signals
	 * (bring reset signal down)
	 */
	rc = usbat_write_user_io(us,
							 USBAT_UIO_OE1  | USBAT_UIO_OE0,
							 USBAT_UIO_EPAD | USBAT_UIO_1);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Enable card detect
 */
static int usbat_device_enable_cdt(struct us_data *us)
{
	int rc;

	/* Enable peripheral control signals and card detect */
	rc = usbat_write_user_io(us,
							 USBAT_UIO_ACKD | USBAT_UIO_OE1  | USBAT_UIO_OE0,
							 USBAT_UIO_EPAD | USBAT_UIO_1);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Determine if media is present.
 */
static int usbat_flash_check_media_present(struct us_data *us,
					   unsigned char *uio)
{
	if (*uio & USBAT_UIO_UI0) {
		usb_stor_dbg(us, "no media detected\n");
		return USBAT_FLASH_MEDIA_NONE;
	}

	return USBAT_FLASH_MEDIA_CF;
}

/*
 * Determine if media has changed since last operation
 */
static int usbat_flash_check_media_changed(struct us_data *us,
					   unsigned char *uio)
{
	if (*uio & USBAT_UIO_0) {
		usb_stor_dbg(us, "media change detected\n");
		return USBAT_FLASH_MEDIA_CHANGED;
	}

	return USBAT_FLASH_MEDIA_SAME;
}

/*
 * Check for media change / no media and handle the situation appropriately
 */
static int usbat_flash_check_media(struct us_data *us,
				   struct usbat_info *info)
{
	int rc;
	unsigned char *uio = us->iobuf;

	rc = usbat_read_user_io(us, uio);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	/* Check for media existence */
	rc = usbat_flash_check_media_present(us, uio);
	if (rc == USBAT_FLASH_MEDIA_NONE) {
		info->sense_key = 0x02;
		info->sense_asc = 0x3A;
		info->sense_ascq = 0x00;
		return USB_STOR_TRANSPORT_FAILED;
	}

	/* Check for media change */
	rc = usbat_flash_check_media_changed(us, uio);
	if (rc == USBAT_FLASH_MEDIA_CHANGED) {

		/* Reset and re-enable card detect */
		rc = usbat_device_reset(us);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;
		rc = usbat_device_enable_cdt(us);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		msleep(50);

		rc = usbat_read_user_io(us, uio);
		if (rc != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;
		
		info->sense_key = UNIT_ATTENTION;
		info->sense_asc = 0x28;
		info->sense_ascq = 0x00;
		return USB_STOR_TRANSPORT_FAILED;
	}

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Determine whether we are controlling a flash-based reader/writer,
 * or a HP8200-based CD drive.
 * Sets transport functions as appropriate.
 */
static int usbat_identify_device(struct us_data *us,
				 struct usbat_info *info)
{
	int rc;
	unsigned char status;

	if (!us || !info)
		return USB_STOR_TRANSPORT_ERROR;

	rc = usbat_device_reset(us);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		return rc;
	msleep(500);

	/*
	 * In attempt to distinguish between HP CDRW's and Flash readers, we now
	 * execute the IDENTIFY PACKET DEVICE command. On ATA devices (i.e. flash
	 * readers), this command should fail with error. On ATAPI devices (i.e.
	 * CDROM drives), it should succeed.
	 */
	rc = usbat_write(us, USBAT_ATA, USBAT_ATA_CMD, 0xA1);
 	if (rc != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;

	rc = usbat_get_status(us, &status);
 	if (rc != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;

	/* Check for error bit, or if the command 'fell through' */
	if (status == 0xA1 || !(status & 0x01)) {
		/* Device is HP 8200 */
		usb_stor_dbg(us, "Detected HP8200 CDRW\n");
		info->devicetype = USBAT_DEV_HP8200;
	} else {
		/* Device is a CompactFlash reader/writer */
		usb_stor_dbg(us, "Detected Flash reader/writer\n");
		info->devicetype = USBAT_DEV_FLASH;
	}

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Set the transport function based on the device type
 */
static int usbat_set_transport(struct us_data *us,
			       struct usbat_info *info,
			       int devicetype)
{

	if (!info->devicetype)
		info->devicetype = devicetype;

	if (!info->devicetype)
		usbat_identify_device(us, info);

	switch (info->devicetype) {
	default:
		return USB_STOR_TRANSPORT_ERROR;

	case  USBAT_DEV_HP8200:
		us->transport = usbat_hp8200e_transport;
		break;

	case USBAT_DEV_FLASH:
		us->transport = usbat_flash_transport;
		break;
	}

	return 0;
}

/*
 * Read the media capacity
 */
static int usbat_flash_get_sector_count(struct us_data *us,
					struct usbat_info *info)
{
	unsigned char registers[3] = {
		USBAT_ATA_SECCNT,
		USBAT_ATA_DEVICE,
		USBAT_ATA_CMD,
	};
	unsigned char  command[3] = { 0x01, 0xA0, 0xEC };
	unsigned char *reply;
	unsigned char status;
	int rc;

	if (!us || !info)
		return USB_STOR_TRANSPORT_ERROR;

	reply = kmalloc(512, GFP_NOIO);
	if (!reply)
		return USB_STOR_TRANSPORT_ERROR;

	/* ATA command : IDENTIFY DEVICE */
	rc = usbat_multiple_write(us, registers, command, 3);
	if (rc != USB_STOR_XFER_GOOD) {
		usb_stor_dbg(us, "Gah! identify_device failed\n");
		rc = USB_STOR_TRANSPORT_ERROR;
		goto leave;
	}

	/* Read device status */
	if (usbat_get_status(us, &status) != USB_STOR_XFER_GOOD) {
		rc = USB_STOR_TRANSPORT_ERROR;
		goto leave;
	}

	msleep(100);

	/* Read the device identification data */
	rc = usbat_read_block(us, reply, 512, 0);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		goto leave;

	info->sectors = ((u32)(reply[117]) << 24) |
		((u32)(reply[116]) << 16) |
		((u32)(reply[115]) <<  8) |
		((u32)(reply[114])      );

	rc = USB_STOR_TRANSPORT_GOOD;

 leave:
	kfree(reply);
	return rc;
}

/*
 * Read data from device
 */
static int usbat_flash_read_data(struct us_data *us,
								 struct usbat_info *info,
								 u32 sector,
								 u32 sectors)
{
	unsigned char registers[7] = {
		USBAT_ATA_FEATURES,
		USBAT_ATA_SECCNT,
		USBAT_ATA_SECNUM,
		USBAT_ATA_LBA_ME,
		USBAT_ATA_LBA_HI,
		USBAT_ATA_DEVICE,
		USBAT_ATA_STATUS,
	};
	unsigned char command[7];
	unsigned char *buffer;
	unsigned char  thistime;
	unsigned int totallen, alloclen;
	int len, result;
	unsigned int sg_offset = 0;
	struct scatterlist *sg = NULL;

	result = usbat_flash_check_media(us, info);
	if (result != USB_STOR_TRANSPORT_GOOD)
		return result;

	/*
	 * we're working in LBA mode.  according to the ATA spec,
	 * we can support up to 28-bit addressing.  I don't know if Jumpshot
	 * supports beyond 24-bit addressing.  It's kind of hard to test
	 * since it requires > 8GB CF card.
	 */

	if (sector > 0x0FFFFFFF)
		return USB_STOR_TRANSPORT_ERROR;

	totallen = sectors * info->ssize;

	/*
	 * Since we don't read more than 64 KB at a time, we have to create
	 * a bounce buffer and move the data a piece at a time between the
	 * bounce buffer and the actual transfer buffer.
	 */

	alloclen = min(totallen, 65536u);
	buffer = kmalloc(alloclen, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;

	do {
		/*
		 * loop, never allocate or transfer more than 64k at once
		 * (min(128k, 255*info->ssize) is the real limit)
		 */
		len = min(totallen, alloclen);
		thistime = (len / info->ssize) & 0xff;
 
		/* ATA command 0x20 (READ SECTORS) */
		usbat_pack_ata_sector_cmd(command, thistime, sector, 0x20);

		/* Write/execute ATA read command */
		result = usbat_multiple_write(us, registers, command, 7);
		if (result != USB_STOR_TRANSPORT_GOOD)
			goto leave;

		/* Read the data we just requested */
		result = usbat_read_blocks(us, buffer, len, 0);
		if (result != USB_STOR_TRANSPORT_GOOD)
			goto leave;
  	 
		usb_stor_dbg(us, "%d bytes\n", len);
	
		/* Store the data in the transfer buffer */
		usb_stor_access_xfer_buf(buffer, len, us->srb,
					 &sg, &sg_offset, TO_XFER_BUF);

		sector += thistime;
		totallen -= len;
	} while (totallen > 0);

	kfree(buffer);
	return USB_STOR_TRANSPORT_GOOD;

leave:
	kfree(buffer);
	return USB_STOR_TRANSPORT_ERROR;
}

/*
 * Write data to device
 */
static int usbat_flash_write_data(struct us_data *us,
								  struct usbat_info *info,
								  u32 sector,
								  u32 sectors)
{
	unsigned char registers[7] = {
		USBAT_ATA_FEATURES,
		USBAT_ATA_SECCNT,
		USBAT_ATA_SECNUM,
		USBAT_ATA_LBA_ME,
		USBAT_ATA_LBA_HI,
		USBAT_ATA_DEVICE,
		USBAT_ATA_STATUS,
	};
	unsigned char command[7];
	unsigned char *buffer;
	unsigned char  thistime;
	unsigned int totallen, alloclen;
	int len, result;
	unsigned int sg_offset = 0;
	struct scatterlist *sg = NULL;

	result = usbat_flash_check_media(us, info);
	if (result != USB_STOR_TRANSPORT_GOOD)
		return result;

	/*
	 * we're working in LBA mode.  according to the ATA spec,
	 * we can support up to 28-bit addressing.  I don't know if the device
	 * supports beyond 24-bit addressing.  It's kind of hard to test
	 * since it requires > 8GB media.
	 */

	if (sector > 0x0FFFFFFF)
		return USB_STOR_TRANSPORT_ERROR;

	totallen = sectors * info->ssize;

	/*
	 * Since we don't write more than 64 KB at a time, we have to create
	 * a bounce buffer and move the data a piece at a time between the
	 * bounce buffer and the actual transfer buffer.
	 */

	alloclen = min(totallen, 65536u);
	buffer = kmalloc(alloclen, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;

	do {
		/*
		 * loop, never allocate or transfer more than 64k at once
		 * (min(128k, 255*info->ssize) is the real limit)
		 */
		len = min(totallen, alloclen);
		thistime = (len / info->ssize) & 0xff;

		/* Get the data from the transfer buffer */
		usb_stor_access_xfer_buf(buffer, len, us->srb,
					 &sg, &sg_offset, FROM_XFER_BUF);

		/* ATA command 0x30 (WRITE SECTORS) */
		usbat_pack_ata_sector_cmd(command, thistime, sector, 0x30);

		/* Write/execute ATA write command */
		result = usbat_multiple_write(us, registers, command, 7);
		if (result != USB_STOR_TRANSPORT_GOOD)
			goto leave;

		/* Write the data */
		result = usbat_write_blocks(us, buffer, len, 0);
		if (result != USB_STOR_TRANSPORT_GOOD)
			goto leave;

		sector += thistime;
		totallen -= len;
	} while (totallen > 0);

	kfree(buffer);
	return result;

leave:
	kfree(buffer);
	return USB_STOR_TRANSPORT_ERROR;
}

/*
 * Squeeze a potentially huge (> 65535 byte) read10 command into
 * a little ( <= 65535 byte) ATAPI pipe
 */
static int usbat_hp8200e_handle_read10(struct us_data *us,
				       unsigned char *registers,
				       unsigned char *data,
				       struct scsi_cmnd *srb)
{
	int result = USB_STOR_TRANSPORT_GOOD;
	unsigned char *buffer;
	unsigned int len;
	unsigned int sector;
	unsigned int sg_offset = 0;
	struct scatterlist *sg = NULL;

	usb_stor_dbg(us, "transfersize %d\n", srb->transfersize);

	if (scsi_bufflen(srb) < 0x10000) {

		result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
			registers, data, 19,
			USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
			(USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
			DMA_FROM_DEVICE,
			scsi_sglist(srb),
			scsi_bufflen(srb), scsi_sg_count(srb), 1);

		return result;
	}

	/*
	 * Since we're requesting more data than we can handle in
	 * a single read command (max is 64k-1), we will perform
	 * multiple reads, but each read must be in multiples of
	 * a sector.  Luckily the sector size is in srb->transfersize
	 * (see linux/drivers/scsi/sr.c).
	 */

	if (data[7+0] == GPCMD_READ_CD) {
		len = short_pack(data[7+9], data[7+8]);
		len <<= 16;
		len |= data[7+7];
		usb_stor_dbg(us, "GPCMD_READ_CD: len %d\n", len);
		srb->transfersize = scsi_bufflen(srb)/len;
	}

	if (!srb->transfersize)  {
		srb->transfersize = 2048; /* A guess */
		usb_stor_dbg(us, "transfersize 0, forcing %d\n",
			     srb->transfersize);
	}

	/*
	 * Since we only read in one block at a time, we have to create
	 * a bounce buffer and move the data a piece at a time between the
	 * bounce buffer and the actual transfer buffer.
	 */

	len = (65535/srb->transfersize) * srb->transfersize;
	usb_stor_dbg(us, "Max read is %d bytes\n", len);
	len = min(len, scsi_bufflen(srb));
	buffer = kmalloc(len, GFP_NOIO);
	if (buffer == NULL) /* bloody hell! */
		return USB_STOR_TRANSPORT_FAILED;
	sector = short_pack(data[7+3], data[7+2]);
	sector <<= 16;
	sector |= short_pack(data[7+5], data[7+4]);
	transferred = 0;

	while (transferred != scsi_bufflen(srb)) {

		if (len > scsi_bufflen(srb) - transferred)
			len = scsi_bufflen(srb) - transferred;

		data[3] = len&0xFF; 	  /* (cylL) = expected length (L) */
		data[4] = (len>>8)&0xFF;  /* (cylH) = expected length (H) */

		/* Fix up the SCSI command sector and num sectors */

		data[7+2] = MSB_of(sector>>16); /* SCSI command sector */
		data[7+3] = LSB_of(sector>>16);
		data[7+4] = MSB_of(sector&0xFFFF);
		data[7+5] = LSB_of(sector&0xFFFF);
		if (data[7+0] == GPCMD_READ_CD)
			data[7+6] = 0;
		data[7+7] = MSB_of(len / srb->transfersize); /* SCSI command */
		data[7+8] = LSB_of(len / srb->transfersize); /* num sectors */

		result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
			registers, data, 19,
			USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD, 
			(USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
			DMA_FROM_DEVICE,
			buffer,
			len, 0, 1);

		if (result != USB_STOR_TRANSPORT_GOOD)
			break;

		/* Store the data in the transfer buffer */
		usb_stor_access_xfer_buf(buffer, len, srb,
				 &sg, &sg_offset, TO_XFER_BUF);

		/* Update the amount transferred and the sector number */

		transferred += len;
		sector += len / srb->transfersize;

	} /* while transferred != scsi_bufflen(srb) */

	kfree(buffer);
	return result;
}

static int usbat_select_and_test_registers(struct us_data *us)
{
	int selector;
	unsigned char *status = us->iobuf;

	/* try device = master, then device = slave. */
	for (selector = 0xA0; selector <= 0xB0; selector += 0x10) {
		if (usbat_write(us, USBAT_ATA, USBAT_ATA_DEVICE, selector) !=
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_DEVICE, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_ME, 0x55) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_HI, 0xAA) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
				USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;
	}

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Initialize the USBAT processor and the storage device
 */
static int init_usbat(struct us_data *us, int devicetype)
{
	int rc;
	struct usbat_info *info;
	unsigned char subcountH = USBAT_ATA_LBA_HI;
	unsigned char subcountL = USBAT_ATA_LBA_ME;
	unsigned char *status = us->iobuf;

	us->extra = kzalloc(sizeof(struct usbat_info), GFP_NOIO);
	if (!us->extra)
		return 1;

	info = (struct usbat_info *) (us->extra);

	/* Enable peripheral control signals */
	rc = usbat_write_user_io(us,
				 USBAT_UIO_OE1 | USBAT_UIO_OE0,
				 USBAT_UIO_EPAD | USBAT_UIO_1);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 1\n");

	msleep(2000);

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		return rc;

	usb_stor_dbg(us, "INIT 2\n");

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 3\n");

	rc = usbat_select_and_test_registers(us);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		return rc;

	usb_stor_dbg(us, "INIT 4\n");

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 5\n");

	/* Enable peripheral control signals and card detect */
	rc = usbat_device_enable_cdt(us);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		return rc;

	usb_stor_dbg(us, "INIT 6\n");

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 7\n");

	msleep(1400);

	rc = usbat_read_user_io(us, status);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 8\n");

	rc = usbat_select_and_test_registers(us);
	if (rc != USB_STOR_TRANSPORT_GOOD)
		return rc;

	usb_stor_dbg(us, "INIT 9\n");

	/* At this point, we need to detect which device we are using */
	if (usbat_set_transport(us, info, devicetype))
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 10\n");

	if (usbat_get_device_type(us) == USBAT_DEV_FLASH) { 
		subcountH = 0x02;
		subcountL = 0x00;
	}
	rc = usbat_set_shuttle_features(us, (USBAT_FEAT_ETEN | USBAT_FEAT_ET2 | USBAT_FEAT_ET1),
									0x00, 0x88, 0x08, subcountH, subcountL);
	if (rc != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	usb_stor_dbg(us, "INIT 11\n");

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Transport for the HP 8200e
 */
static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int result;
	unsigned char *status = us->iobuf;
	unsigned char registers[32];
	unsigned char data[32];
	unsigned int len;
	int i;

	len = scsi_bufflen(srb);

	/*
	 * Send A0 (ATA PACKET COMMAND).
	 * Note: I guess we're never going to get any of the ATA
	 * commands... just ATA Packet Commands.
 	 */

	registers[0] = USBAT_ATA_FEATURES;
	registers[1] = USBAT_ATA_SECCNT;
	registers[2] = USBAT_ATA_SECNUM;
	registers[3] = USBAT_ATA_LBA_ME;
	registers[4] = USBAT_ATA_LBA_HI;
	registers[5] = USBAT_ATA_DEVICE;
	registers[6] = USBAT_ATA_CMD;
	data[0] = 0x00;
	data[1] = 0x00;
	data[2] = 0x00;
	data[3] = len&0xFF; 		/* (cylL) = expected length (L) */
	data[4] = (len>>8)&0xFF; 	/* (cylH) = expected length (H) */
	data[5] = 0xB0; 		/* (device sel) = slave */
	data[6] = 0xA0; 		/* (command) = ATA PACKET COMMAND */

	for (i=7; i<19; i++) {
		registers[i] = 0x10;
		data[i] = (i-7 >= srb->cmd_len) ? 0 : srb->cmnd[i-7];
	}

	result = usbat_get_status(us, status);
	usb_stor_dbg(us, "Status = %02X\n", *status);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;
	if (srb->cmnd[0] == TEST_UNIT_READY)
		transferred = 0;

	if (srb->sc_data_direction == DMA_TO_DEVICE) {

		result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
			registers, data, 19,
			USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
			(USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
			DMA_TO_DEVICE,
			scsi_sglist(srb),
			len, scsi_sg_count(srb), 10);

		if (result == USB_STOR_TRANSPORT_GOOD) {
			transferred += len;
			usb_stor_dbg(us, "Wrote %08X bytes\n", transferred);
		}

		return result;

	} else if (srb->cmnd[0] == READ_10 ||
		   srb->cmnd[0] == GPCMD_READ_CD) {

		return usbat_hp8200e_handle_read10(us, registers, data, srb);

	}

	if (len > 0xFFFF) {
		usb_stor_dbg(us, "Error: len = %08X... what do I do now?\n",
			     len);
		return USB_STOR_TRANSPORT_ERROR;
	}

	result = usbat_multiple_write(us, registers, data, 7);

	if (result != USB_STOR_TRANSPORT_GOOD)
		return result;

	/*
	 * Write the 12-byte command header.
	 *
	 * If the command is BLANK then set the timer for 75 minutes.
	 * Otherwise set it for 10 minutes.
	 *
	 * NOTE: THE 8200 DOCUMENTATION STATES THAT BLANKING A CDRW
	 * AT SPEED 4 IS UNRELIABLE!!!
	 */

	result = usbat_write_block(us, USBAT_ATA, srb->cmnd, 12,
				   srb->cmnd[0] == GPCMD_BLANK ? 75 : 10, 0);

	if (result != USB_STOR_TRANSPORT_GOOD)
		return result;

	/* If there is response data to be read in then do it here. */

	if (len != 0 && (srb->sc_data_direction == DMA_FROM_DEVICE)) {

		/* How many bytes to read in? Check cylL register */

		if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
		    	USB_STOR_XFER_GOOD) {
			return USB_STOR_TRANSPORT_ERROR;
		}

		if (len > 0xFF) { /* need to read cylH also */
			len = *status;
			if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) !=
				    USB_STOR_XFER_GOOD) {
				return USB_STOR_TRANSPORT_ERROR;
			}
			len += ((unsigned int) *status)<<8;
		}
		else
			len = *status;


		result = usbat_read_block(us, scsi_sglist(srb), len,
			                                   scsi_sg_count(srb));
	}

	return result;
}

/*
 * Transport for USBAT02-based CompactFlash and similar storage devices
 */
static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us)
{
	int rc;
	struct usbat_info *info = (struct usbat_info *) (us->extra);
	unsigned long block, blocks;
	unsigned char *ptr = us->iobuf;
	static unsigned char inquiry_response[36] = {
		0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
	};

	if (srb->cmnd[0] == INQUIRY) {
		usb_stor_dbg(us, "INQUIRY - Returning bogus response\n");
		memcpy(ptr, inquiry_response, sizeof(inquiry_response));
		fill_inquiry_response(us, ptr, 36);
		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == READ_CAPACITY) {
		rc = usbat_flash_check_media(us, info);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		rc = usbat_flash_get_sector_count(us, info);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		/* hard coded 512 byte sectors as per ATA spec */
		info->ssize = 0x200;
		usb_stor_dbg(us, "READ_CAPACITY: %ld sectors, %ld bytes per sector\n",
			     info->sectors, info->ssize);

		/*
		 * build the reply
		 * note: must return the sector number of the last sector,
		 * *not* the total number of sectors
		 */
		((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
		((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
		usb_stor_set_xfer_buf(ptr, 8, srb);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == MODE_SELECT_10) {
		usb_stor_dbg(us, "Gah! MODE_SELECT_10\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	if (srb->cmnd[0] == READ_10) {
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
				((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

		usb_stor_dbg(us, "READ_10: read block 0x%04lx  count %ld\n",
			     block, blocks);
		return usbat_flash_read_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == READ_12) {
		/*
		 * I don't think we'll ever see a READ_12 but support it anyway
		 */
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
		        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
		         ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

		usb_stor_dbg(us, "READ_12: read block 0x%04lx  count %ld\n",
			     block, blocks);
		return usbat_flash_read_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == WRITE_10) {
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
		        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

		usb_stor_dbg(us, "WRITE_10: write block 0x%04lx  count %ld\n",
			     block, blocks);
		return usbat_flash_write_data(us, info, block, blocks);
	}

	if (srb->cmnd[0] == WRITE_12) {
		/*
		 * I don't think we'll ever see a WRITE_12 but support it anyway
		 */
		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
		        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
		         ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

		usb_stor_dbg(us, "WRITE_12: write block 0x%04lx  count %ld\n",
			     block, blocks);
		return usbat_flash_write_data(us, info, block, blocks);
	}


	if (srb->cmnd[0] == TEST_UNIT_READY) {
		usb_stor_dbg(us, "TEST_UNIT_READY\n");

		rc = usbat_flash_check_media(us, info);
		if (rc != USB_STOR_TRANSPORT_GOOD)
			return rc;

		return usbat_check_status(us);
	}

	if (srb->cmnd[0] == REQUEST_SENSE) {
		usb_stor_dbg(us, "REQUEST_SENSE\n");

		memset(ptr, 0, 18);
		ptr[0] = 0xF0;
		ptr[2] = info->sense_key;
		ptr[7] = 11;
		ptr[12] = info->sense_asc;
		ptr[13] = info->sense_ascq;
		usb_stor_set_xfer_buf(ptr, 18, srb);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
		/*
		 * sure.  whatever.  not like we can stop the user from popping
		 * the media out of the device (no locking doors, etc)
		 */
		return USB_STOR_TRANSPORT_GOOD;
	}

	usb_stor_dbg(us, "Gah! Unknown command: %d (0x%x)\n",
		     srb->cmnd[0], srb->cmnd[0]);
	info->sense_key = 0x05;
	info->sense_asc = 0x20;
	info->sense_ascq = 0x00;
	return USB_STOR_TRANSPORT_FAILED;
}

static int init_usbat_cd(struct us_data *us)
{
	return init_usbat(us, USBAT_DEV_HP8200);
}

static int init_usbat_flash(struct us_data *us)
{
	return init_usbat(us, USBAT_DEV_FLASH);
}

static struct scsi_host_template usbat_host_template;

static int usbat_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	struct us_data *us;
	int result;

	result = usb_stor_probe1(&us, intf, id,
			(id - usbat_usb_ids) + usbat_unusual_dev_list,
			&usbat_host_template);
	if (result)
		return result;

	/*
	 * The actual transport will be determined later by the
	 * initialization routine; this is just a placeholder.
	 */
	us->transport_name = "Shuttle USBAT";
	us->transport = usbat_flash_transport;
	us->transport_reset = usb_stor_CB_reset;
	us->max_lun = 0;

	result = usb_stor_probe2(us);
	return result;
}

static struct usb_driver usbat_driver = {
	.name =		DRV_NAME,
	.probe =	usbat_probe,
	.disconnect =	usb_stor_disconnect,
	.suspend =	usb_stor_suspend,
	.resume =	usb_stor_resume,
	.reset_resume =	usb_stor_reset_resume,
	.pre_reset =	usb_stor_pre_reset,
	.post_reset =	usb_stor_post_reset,
	.id_table =	usbat_usb_ids,
	.soft_unbind =	1,
	.no_dynamic_id = 1,
};

module_usb_stor_driver(usbat_driver, usbat_host_template, DRV_NAME);