Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for SanDisk SDDR-09 SmartMedia reader
 *
 *   (c) 2000, 2001 Robert Baruch (autophile@starband.net)
 *   (c) 2002 Andries Brouwer (aeb@cwi.nl)
 * Developed with the assistance of:
 *   (c) 2002 Alan Stern <stern@rowland.org>
 *
 * The SanDisk SDDR-09 SmartMedia reader uses the Shuttle EUSB-01 chip.
 * This chip is a programmable USB controller. In the SDDR-09, it has
 * been programmed to obey a certain limited set of SCSI commands.
 * This driver translates the "real" SCSI commands to the SDDR-09 SCSI
 * commands.
 */

/*
 * Known vendor commands: 12 bytes, first byte is opcode
 *
 * E7: read scatter gather
 * E8: read
 * E9: write
 * EA: erase
 * EB: reset
 * EC: read status
 * ED: read ID
 * EE: write CIS (?)
 * EF: compute checksum (?)
 */

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

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

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

#define DRV_NAME "ums-sddr09"

MODULE_DESCRIPTION("Driver for SanDisk SDDR-09 SmartMedia reader");
MODULE_AUTHOR("Andries Brouwer <aeb@cwi.nl>, Robert Baruch <autophile@starband.net>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(USB_STORAGE);

static int usb_stor_sddr09_dpcm_init(struct us_data *us);
static int sddr09_transport(struct scsi_cmnd *srb, struct us_data *us);
static int usb_stor_sddr09_init(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 sddr09_usb_ids[] = {
#	include "unusual_sddr09.h"
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, sddr09_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 sddr09_unusual_dev_list[] = {
#	include "unusual_sddr09.h"
	{ }		/* Terminating entry */
};

#undef UNUSUAL_DEV


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

/*
 * First some stuff that does not belong here:
 * data on SmartMedia and other cards, completely
 * unrelated to this driver.
 * Similar stuff occurs in <linux/mtd/nand_ids.h>.
 */

struct nand_flash_dev {
	int model_id;
	int chipshift;		/* 1<<cs bytes total capacity */
	char pageshift;		/* 1<<ps bytes in a page */
	char blockshift;	/* 1<<bs pages in an erase block */
	char zoneshift;		/* 1<<zs blocks in a zone */
				/* # of logical blocks is 125/128 of this */
	char pageadrlen;	/* length of an address in bytes - 1 */
};

/*
 * NAND Flash Manufacturer ID Codes
 */
#define NAND_MFR_AMD		0x01
#define NAND_MFR_NATSEMI	0x8f
#define NAND_MFR_TOSHIBA	0x98
#define NAND_MFR_SAMSUNG	0xec

static inline char *nand_flash_manufacturer(int manuf_id) {
	switch(manuf_id) {
	case NAND_MFR_AMD:
		return "AMD";
	case NAND_MFR_NATSEMI:
		return "NATSEMI";
	case NAND_MFR_TOSHIBA:
		return "Toshiba";
	case NAND_MFR_SAMSUNG:
		return "Samsung";
	default:
		return "unknown";
	}
}

/*
 * It looks like it is unnecessary to attach manufacturer to the
 * remaining data: SSFDC prescribes manufacturer-independent id codes.
 *
 * 256 MB NAND flash has a 5-byte ID with 2nd byte 0xaa, 0xba, 0xca or 0xda.
 */

static struct nand_flash_dev nand_flash_ids[] = {
	/* NAND flash */
	{ 0x6e, 20, 8, 4, 8, 2},	/* 1 MB */
	{ 0xe8, 20, 8, 4, 8, 2},	/* 1 MB */
	{ 0xec, 20, 8, 4, 8, 2},	/* 1 MB */
	{ 0x64, 21, 8, 4, 9, 2}, 	/* 2 MB */
	{ 0xea, 21, 8, 4, 9, 2},	/* 2 MB */
	{ 0x6b, 22, 9, 4, 9, 2},	/* 4 MB */
	{ 0xe3, 22, 9, 4, 9, 2},	/* 4 MB */
	{ 0xe5, 22, 9, 4, 9, 2},	/* 4 MB */
	{ 0xe6, 23, 9, 4, 10, 2},	/* 8 MB */
	{ 0x73, 24, 9, 5, 10, 2},	/* 16 MB */
	{ 0x75, 25, 9, 5, 10, 2},	/* 32 MB */
	{ 0x76, 26, 9, 5, 10, 3},	/* 64 MB */
	{ 0x79, 27, 9, 5, 10, 3},	/* 128 MB */

	/* MASK ROM */
	{ 0x5d, 21, 9, 4, 8, 2},	/* 2 MB */
	{ 0xd5, 22, 9, 4, 9, 2},	/* 4 MB */
	{ 0xd6, 23, 9, 4, 10, 2},	/* 8 MB */
	{ 0x57, 24, 9, 4, 11, 2},	/* 16 MB */
	{ 0x58, 25, 9, 4, 12, 2},	/* 32 MB */
	{ 0,}
};

static struct nand_flash_dev *
nand_find_id(unsigned char id) {
	int i;

	for (i = 0; i < ARRAY_SIZE(nand_flash_ids); i++)
		if (nand_flash_ids[i].model_id == id)
			return &(nand_flash_ids[i]);
	return NULL;
}

/*
 * ECC computation.
 */
static unsigned char parity[256];
static unsigned char ecc2[256];

static void nand_init_ecc(void) {
	int i, j, a;

	parity[0] = 0;
	for (i = 1; i < 256; i++)
		parity[i] = (parity[i&(i-1)] ^ 1);

	for (i = 0; i < 256; i++) {
		a = 0;
		for (j = 0; j < 8; j++) {
			if (i & (1<<j)) {
				if ((j & 1) == 0)
					a ^= 0x04;
				if ((j & 2) == 0)
					a ^= 0x10;
				if ((j & 4) == 0)
					a ^= 0x40;
			}
		}
		ecc2[i] = ~(a ^ (a<<1) ^ (parity[i] ? 0xa8 : 0));
	}
}

/* compute 3-byte ecc on 256 bytes */
static void nand_compute_ecc(unsigned char *data, unsigned char *ecc) {
	int i, j, a;
	unsigned char par = 0, bit, bits[8] = {0};

	/* collect 16 checksum bits */
	for (i = 0; i < 256; i++) {
		par ^= data[i];
		bit = parity[data[i]];
		for (j = 0; j < 8; j++)
			if ((i & (1<<j)) == 0)
				bits[j] ^= bit;
	}

	/* put 4+4+4 = 12 bits in the ecc */
	a = (bits[3] << 6) + (bits[2] << 4) + (bits[1] << 2) + bits[0];
	ecc[0] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));

	a = (bits[7] << 6) + (bits[6] << 4) + (bits[5] << 2) + bits[4];
	ecc[1] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));

	ecc[2] = ecc2[par];
}

static int nand_compare_ecc(unsigned char *data, unsigned char *ecc) {
	return (data[0] == ecc[0] && data[1] == ecc[1] && data[2] == ecc[2]);
}

static void nand_store_ecc(unsigned char *data, unsigned char *ecc) {
	memcpy(data, ecc, 3);
}

/*
 * The actual driver starts here.
 */

struct sddr09_card_info {
	unsigned long	capacity;	/* Size of card in bytes */
	int		pagesize;	/* Size of page in bytes */
	int		pageshift;	/* log2 of pagesize */
	int		blocksize;	/* Size of block in pages */
	int		blockshift;	/* log2 of blocksize */
	int		blockmask;	/* 2^blockshift - 1 */
	int		*lba_to_pba;	/* logical to physical map */
	int		*pba_to_lba;	/* physical to logical map */
	int		lbact;		/* number of available pages */
	int		flags;
#define	SDDR09_WP	1		/* write protected */
};

/*
 * On my 16MB card, control blocks have size 64 (16 real control bytes,
 * and 48 junk bytes). In reality of course the card uses 16 control bytes,
 * so the reader makes up the remaining 48. Don't know whether these numbers
 * depend on the card. For now a constant.
 */
#define CONTROL_SHIFT 6

/*
 * On my Combo CF/SM reader, the SM reader has LUN 1.
 * (and things fail with LUN 0).
 * It seems LUN is irrelevant for others.
 */
#define LUN	1
#define	LUNBITS	(LUN << 5)

/*
 * LBA and PBA are unsigned ints. Special values.
 */
#define UNDEF    0xffffffff
#define SPARE    0xfffffffe
#define UNUSABLE 0xfffffffd

static const int erase_bad_lba_entries = 0;

/* send vendor interface command (0x41) */
/* called for requests 0, 1, 8 */
static int
sddr09_send_command(struct us_data *us,
		    unsigned char request,
		    unsigned char direction,
		    unsigned char *xfer_data,
		    unsigned int xfer_len) {
	unsigned int pipe;
	unsigned char requesttype = (0x41 | direction);
	int rc;

	// Get the receive or send control pipe number

	if (direction == USB_DIR_IN)
		pipe = us->recv_ctrl_pipe;
	else
		pipe = us->send_ctrl_pipe;

	rc = usb_stor_ctrl_transfer(us, pipe, request, requesttype,
				   0, 0, xfer_data, xfer_len);
	switch (rc) {
		case USB_STOR_XFER_GOOD:	return 0;
		case USB_STOR_XFER_STALLED:	return -EPIPE;
		default:			return -EIO;
	}
}

static int
sddr09_send_scsi_command(struct us_data *us,
			 unsigned char *command,
			 unsigned int command_len) {
	return sddr09_send_command(us, 0, USB_DIR_OUT, command, command_len);
}

#if 0
/*
 * Test Unit Ready Command: 12 bytes.
 * byte 0: opcode: 00
 */
static int
sddr09_test_unit_ready(struct us_data *us) {
	unsigned char *command = us->iobuf;
	int result;

	memset(command, 0, 6);
	command[1] = LUNBITS;

	result = sddr09_send_scsi_command(us, command, 6);

	usb_stor_dbg(us, "sddr09_test_unit_ready returns %d\n", result);

	return result;
}
#endif

/*
 * Request Sense Command: 12 bytes.
 * byte 0: opcode: 03
 * byte 4: data length
 */
static int
sddr09_request_sense(struct us_data *us, unsigned char *sensebuf, int buflen) {
	unsigned char *command = us->iobuf;
	int result;

	memset(command, 0, 12);
	command[0] = 0x03;
	command[1] = LUNBITS;
	command[4] = buflen;

	result = sddr09_send_scsi_command(us, command, 12);
	if (result)
		return result;

	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
			sensebuf, buflen, NULL);
	return (result == USB_STOR_XFER_GOOD ? 0 : -EIO);
}

/*
 * Read Command: 12 bytes.
 * byte 0: opcode: E8
 * byte 1: last two bits: 00: read data, 01: read blockwise control,
 *			10: read both, 11: read pagewise control.
 *	 It turns out we need values 20, 21, 22, 23 here (LUN 1).
 * bytes 2-5: address (interpretation depends on byte 1, see below)
 * bytes 10-11: count (idem)
 *
 * A page has 512 data bytes and 64 control bytes (16 control and 48 junk).
 * A read data command gets data in 512-byte pages.
 * A read control command gets control in 64-byte chunks.
 * A read both command gets data+control in 576-byte chunks.
 *
 * Blocks are groups of 32 pages, and read blockwise control jumps to the
 * next block, while read pagewise control jumps to the next page after
 * reading a group of 64 control bytes.
 * [Here 512 = 1<<pageshift, 32 = 1<<blockshift, 64 is constant?]
 *
 * (1 MB and 2 MB cards are a bit different, but I have only a 16 MB card.)
 */

static int
sddr09_readX(struct us_data *us, int x, unsigned long fromaddress,
	     int nr_of_pages, int bulklen, unsigned char *buf,
	     int use_sg) {

	unsigned char *command = us->iobuf;
	int result;

	command[0] = 0xE8;
	command[1] = LUNBITS | x;
	command[2] = MSB_of(fromaddress>>16);
	command[3] = LSB_of(fromaddress>>16); 
	command[4] = MSB_of(fromaddress & 0xFFFF);
	command[5] = LSB_of(fromaddress & 0xFFFF); 
	command[6] = 0;
	command[7] = 0;
	command[8] = 0;
	command[9] = 0;
	command[10] = MSB_of(nr_of_pages);
	command[11] = LSB_of(nr_of_pages);

	result = sddr09_send_scsi_command(us, command, 12);

	if (result) {
		usb_stor_dbg(us, "Result for send_control in sddr09_read2%d %d\n",
			     x, result);
		return result;
	}

	result = usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe,
				       buf, bulklen, use_sg, NULL);

	if (result != USB_STOR_XFER_GOOD) {
		usb_stor_dbg(us, "Result for bulk_transfer in sddr09_read2%d %d\n",
			     x, result);
		return -EIO;
	}
	return 0;
}

/*
 * Read Data
 *
 * fromaddress counts data shorts:
 * increasing it by 256 shifts the bytestream by 512 bytes;
 * the last 8 bits are ignored.
 *
 * nr_of_pages counts pages of size (1 << pageshift).
 */
static int
sddr09_read20(struct us_data *us, unsigned long fromaddress,
	      int nr_of_pages, int pageshift, unsigned char *buf, int use_sg) {
	int bulklen = nr_of_pages << pageshift;

	/* The last 8 bits of fromaddress are ignored. */
	return sddr09_readX(us, 0, fromaddress, nr_of_pages, bulklen,
			    buf, use_sg);
}

/*
 * Read Blockwise Control
 *
 * fromaddress gives the starting position (as in read data;
 * the last 8 bits are ignored); increasing it by 32*256 shifts
 * the output stream by 64 bytes.
 *
 * count counts control groups of size (1 << controlshift).
 * For me, controlshift = 6. Is this constant?
 *
 * After getting one control group, jump to the next block
 * (fromaddress += 8192).
 */
static int
sddr09_read21(struct us_data *us, unsigned long fromaddress,
	      int count, int controlshift, unsigned char *buf, int use_sg) {

	int bulklen = (count << controlshift);
	return sddr09_readX(us, 1, fromaddress, count, bulklen,
			    buf, use_sg);
}

/*
 * Read both Data and Control
 *
 * fromaddress counts data shorts, ignoring control:
 * increasing it by 256 shifts the bytestream by 576 = 512+64 bytes;
 * the last 8 bits are ignored.
 *
 * nr_of_pages counts pages of size (1 << pageshift) + (1 << controlshift).
 */
static int
sddr09_read22(struct us_data *us, unsigned long fromaddress,
	      int nr_of_pages, int pageshift, unsigned char *buf, int use_sg) {

	int bulklen = (nr_of_pages << pageshift) + (nr_of_pages << CONTROL_SHIFT);
	usb_stor_dbg(us, "reading %d pages, %d bytes\n", nr_of_pages, bulklen);
	return sddr09_readX(us, 2, fromaddress, nr_of_pages, bulklen,
			    buf, use_sg);
}

#if 0
/*
 * Read Pagewise Control
 *
 * fromaddress gives the starting position (as in read data;
 * the last 8 bits are ignored); increasing it by 256 shifts
 * the output stream by 64 bytes.
 *
 * count counts control groups of size (1 << controlshift).
 * For me, controlshift = 6. Is this constant?
 *
 * After getting one control group, jump to the next page
 * (fromaddress += 256).
 */
static int
sddr09_read23(struct us_data *us, unsigned long fromaddress,
	      int count, int controlshift, unsigned char *buf, int use_sg) {

	int bulklen = (count << controlshift);
	return sddr09_readX(us, 3, fromaddress, count, bulklen,
			    buf, use_sg);
}
#endif

/*
 * Erase Command: 12 bytes.
 * byte 0: opcode: EA
 * bytes 6-9: erase address (big-endian, counting shorts, sector aligned).
 * 
 * Always precisely one block is erased; bytes 2-5 and 10-11 are ignored.
 * The byte address being erased is 2*Eaddress.
 * The CIS cannot be erased.
 */
static int
sddr09_erase(struct us_data *us, unsigned long Eaddress) {
	unsigned char *command = us->iobuf;
	int result;

	usb_stor_dbg(us, "erase address %lu\n", Eaddress);

	memset(command, 0, 12);
	command[0] = 0xEA;
	command[1] = LUNBITS;
	command[6] = MSB_of(Eaddress>>16);
	command[7] = LSB_of(Eaddress>>16);
	command[8] = MSB_of(Eaddress & 0xFFFF);
	command[9] = LSB_of(Eaddress & 0xFFFF);

	result = sddr09_send_scsi_command(us, command, 12);

	if (result)
		usb_stor_dbg(us, "Result for send_control in sddr09_erase %d\n",
			     result);

	return result;
}

/*
 * Write CIS Command: 12 bytes.
 * byte 0: opcode: EE
 * bytes 2-5: write address in shorts
 * bytes 10-11: sector count
 *
 * This writes at the indicated address. Don't know how it differs
 * from E9. Maybe it does not erase? However, it will also write to
 * the CIS.
 *
 * When two such commands on the same page follow each other directly,
 * the second one is not done.
 */

/*
 * Write Command: 12 bytes.
 * byte 0: opcode: E9
 * bytes 2-5: write address (big-endian, counting shorts, sector aligned).
 * bytes 6-9: erase address (big-endian, counting shorts, sector aligned).
 * bytes 10-11: sector count (big-endian, in 512-byte sectors).
 *
 * If write address equals erase address, the erase is done first,
 * otherwise the write is done first. When erase address equals zero
 * no erase is done?
 */
static int
sddr09_writeX(struct us_data *us,
	      unsigned long Waddress, unsigned long Eaddress,
	      int nr_of_pages, int bulklen, unsigned char *buf, int use_sg) {

	unsigned char *command = us->iobuf;
	int result;

	command[0] = 0xE9;
	command[1] = LUNBITS;

	command[2] = MSB_of(Waddress>>16);
	command[3] = LSB_of(Waddress>>16);
	command[4] = MSB_of(Waddress & 0xFFFF);
	command[5] = LSB_of(Waddress & 0xFFFF);

	command[6] = MSB_of(Eaddress>>16);
	command[7] = LSB_of(Eaddress>>16);
	command[8] = MSB_of(Eaddress & 0xFFFF);
	command[9] = LSB_of(Eaddress & 0xFFFF);

	command[10] = MSB_of(nr_of_pages);
	command[11] = LSB_of(nr_of_pages);

	result = sddr09_send_scsi_command(us, command, 12);

	if (result) {
		usb_stor_dbg(us, "Result for send_control in sddr09_writeX %d\n",
			     result);
		return result;
	}

	result = usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe,
				       buf, bulklen, use_sg, NULL);

	if (result != USB_STOR_XFER_GOOD) {
		usb_stor_dbg(us, "Result for bulk_transfer in sddr09_writeX %d\n",
			     result);
		return -EIO;
	}
	return 0;
}

/* erase address, write same address */
static int
sddr09_write_inplace(struct us_data *us, unsigned long address,
		     int nr_of_pages, int pageshift, unsigned char *buf,
		     int use_sg) {
	int bulklen = (nr_of_pages << pageshift) + (nr_of_pages << CONTROL_SHIFT);
	return sddr09_writeX(us, address, address, nr_of_pages, bulklen,
			     buf, use_sg);
}

#if 0
/*
 * Read Scatter Gather Command: 3+4n bytes.
 * byte 0: opcode E7
 * byte 2: n
 * bytes 4i-1,4i,4i+1: page address
 * byte 4i+2: page count
 * (i=1..n)
 *
 * This reads several pages from the card to a single memory buffer.
 * The last two bits of byte 1 have the same meaning as for E8.
 */
static int
sddr09_read_sg_test_only(struct us_data *us) {
	unsigned char *command = us->iobuf;
	int result, bulklen, nsg, ct;
	unsigned char *buf;
	unsigned long address;

	nsg = bulklen = 0;
	command[0] = 0xE7;
	command[1] = LUNBITS;
	command[2] = 0;
	address = 040000; ct = 1;
	nsg++;
	bulklen += (ct << 9);
	command[4*nsg+2] = ct;
	command[4*nsg+1] = ((address >> 9) & 0xFF);
	command[4*nsg+0] = ((address >> 17) & 0xFF);
	command[4*nsg-1] = ((address >> 25) & 0xFF);

	address = 0340000; ct = 1;
	nsg++;
	bulklen += (ct << 9);
	command[4*nsg+2] = ct;
	command[4*nsg+1] = ((address >> 9) & 0xFF);
	command[4*nsg+0] = ((address >> 17) & 0xFF);
	command[4*nsg-1] = ((address >> 25) & 0xFF);

	address = 01000000; ct = 2;
	nsg++;
	bulklen += (ct << 9);
	command[4*nsg+2] = ct;
	command[4*nsg+1] = ((address >> 9) & 0xFF);
	command[4*nsg+0] = ((address >> 17) & 0xFF);
	command[4*nsg-1] = ((address >> 25) & 0xFF);

	command[2] = nsg;

	result = sddr09_send_scsi_command(us, command, 4*nsg+3);

	if (result) {
		usb_stor_dbg(us, "Result for send_control in sddr09_read_sg %d\n",
			     result);
		return result;
	}

	buf = kmalloc(bulklen, GFP_NOIO);
	if (!buf)
		return -ENOMEM;

	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
				       buf, bulklen, NULL);
	kfree(buf);
	if (result != USB_STOR_XFER_GOOD) {
		usb_stor_dbg(us, "Result for bulk_transfer in sddr09_read_sg %d\n",
			     result);
		return -EIO;
	}

	return 0;
}
#endif

/*
 * Read Status Command: 12 bytes.
 * byte 0: opcode: EC
 *
 * Returns 64 bytes, all zero except for the first.
 * bit 0: 1: Error
 * bit 5: 1: Suspended
 * bit 6: 1: Ready
 * bit 7: 1: Not write-protected
 */

static int
sddr09_read_status(struct us_data *us, unsigned char *status) {

	unsigned char *command = us->iobuf;
	unsigned char *data = us->iobuf;
	int result;

	usb_stor_dbg(us, "Reading status...\n");

	memset(command, 0, 12);
	command[0] = 0xEC;
	command[1] = LUNBITS;

	result = sddr09_send_scsi_command(us, command, 12);
	if (result)
		return result;

	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
				       data, 64, NULL);
	*status = data[0];
	return (result == USB_STOR_XFER_GOOD ? 0 : -EIO);
}

static int
sddr09_read_data(struct us_data *us,
		 unsigned long address,
		 unsigned int sectors) {

	struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
	unsigned char *buffer;
	unsigned int lba, maxlba, pba;
	unsigned int page, pages;
	unsigned int len, offset;
	struct scatterlist *sg;
	int result;

	// Figure out the initial LBA and page
	lba = address >> info->blockshift;
	page = (address & info->blockmask);
	maxlba = info->capacity >> (info->pageshift + info->blockshift);
	if (lba >= maxlba)
		return -EIO;

	// 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 = min(sectors, (unsigned int) info->blocksize) * info->pagesize;
	buffer = kmalloc(len, GFP_NOIO);
	if (!buffer)
		return -ENOMEM;

	// This could be made much more efficient by checking for
	// contiguous LBA's. Another exercise left to the student.

	result = 0;
	offset = 0;
	sg = NULL;

	while (sectors > 0) {

		/* Find number of pages we can read in this block */
		pages = min(sectors, info->blocksize - page);
		len = pages << info->pageshift;

		/* Not overflowing capacity? */
		if (lba >= maxlba) {
			usb_stor_dbg(us, "Error: Requested lba %u exceeds maximum %u\n",
				     lba, maxlba);
			result = -EIO;
			break;
		}

		/* Find where this lba lives on disk */
		pba = info->lba_to_pba[lba];

		if (pba == UNDEF) {	/* this lba was never written */

			usb_stor_dbg(us, "Read %d zero pages (LBA %d) page %d\n",
				     pages, lba, page);

			/*
			 * This is not really an error. It just means
			 * that the block has never been written.
			 * Instead of returning an error
			 * it is better to return all zero data.
			 */

			memset(buffer, 0, len);

		} else {
			usb_stor_dbg(us, "Read %d pages, from PBA %d (LBA %d) page %d\n",
				     pages, pba, lba, page);

			address = ((pba << info->blockshift) + page) << 
				info->pageshift;

			result = sddr09_read20(us, address>>1,
					pages, info->pageshift, buffer, 0);
			if (result)
				break;
		}

		// Store the data in the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&sg, &offset, TO_XFER_BUF);

		page = 0;
		lba++;
		sectors -= pages;
	}

	kfree(buffer);
	return result;
}

static unsigned int
sddr09_find_unused_pba(struct sddr09_card_info *info, unsigned int lba) {
	static unsigned int lastpba = 1;
	int zonestart, end, i;

	zonestart = (lba/1000) << 10;
	end = info->capacity >> (info->blockshift + info->pageshift);
	end -= zonestart;
	if (end > 1024)
		end = 1024;

	for (i = lastpba+1; i < end; i++) {
		if (info->pba_to_lba[zonestart+i] == UNDEF) {
			lastpba = i;
			return zonestart+i;
		}
	}
	for (i = 0; i <= lastpba; i++) {
		if (info->pba_to_lba[zonestart+i] == UNDEF) {
			lastpba = i;
			return zonestart+i;
		}
	}
	return 0;
}

static int
sddr09_write_lba(struct us_data *us, unsigned int lba,
		 unsigned int page, unsigned int pages,
		 unsigned char *ptr, unsigned char *blockbuffer) {

	struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
	unsigned long address;
	unsigned int pba, lbap;
	unsigned int pagelen;
	unsigned char *bptr, *cptr, *xptr;
	unsigned char ecc[3];
	int i, result;

	lbap = ((lba % 1000) << 1) | 0x1000;
	if (parity[MSB_of(lbap) ^ LSB_of(lbap)])
		lbap ^= 1;
	pba = info->lba_to_pba[lba];

	if (pba == UNDEF) {
		pba = sddr09_find_unused_pba(info, lba);
		if (!pba) {
			printk(KERN_WARNING
			       "sddr09_write_lba: Out of unused blocks\n");
			return -ENOSPC;
		}
		info->pba_to_lba[pba] = lba;
		info->lba_to_pba[lba] = pba;
	}

	if (pba == 1) {
		/*
		 * Maybe it is impossible to write to PBA 1.
		 * Fake success, but don't do anything.
		 */
		printk(KERN_WARNING "sddr09: avoid writing to pba 1\n");
		return 0;
	}

	pagelen = (1 << info->pageshift) + (1 << CONTROL_SHIFT);

	/* read old contents */
	address = (pba << (info->pageshift + info->blockshift));
	result = sddr09_read22(us, address>>1, info->blocksize,
			       info->pageshift, blockbuffer, 0);
	if (result)
		return result;

	/* check old contents and fill lba */
	for (i = 0; i < info->blocksize; i++) {
		bptr = blockbuffer + i*pagelen;
		cptr = bptr + info->pagesize;
		nand_compute_ecc(bptr, ecc);
		if (!nand_compare_ecc(cptr+13, ecc)) {
			usb_stor_dbg(us, "Warning: bad ecc in page %d- of pba %d\n",
				     i, pba);
			nand_store_ecc(cptr+13, ecc);
		}
		nand_compute_ecc(bptr+(info->pagesize / 2), ecc);
		if (!nand_compare_ecc(cptr+8, ecc)) {
			usb_stor_dbg(us, "Warning: bad ecc in page %d+ of pba %d\n",
				     i, pba);
			nand_store_ecc(cptr+8, ecc);
		}
		cptr[6] = cptr[11] = MSB_of(lbap);
		cptr[7] = cptr[12] = LSB_of(lbap);
	}

	/* copy in new stuff and compute ECC */
	xptr = ptr;
	for (i = page; i < page+pages; i++) {
		bptr = blockbuffer + i*pagelen;
		cptr = bptr + info->pagesize;
		memcpy(bptr, xptr, info->pagesize);
		xptr += info->pagesize;
		nand_compute_ecc(bptr, ecc);
		nand_store_ecc(cptr+13, ecc);
		nand_compute_ecc(bptr+(info->pagesize / 2), ecc);
		nand_store_ecc(cptr+8, ecc);
	}

	usb_stor_dbg(us, "Rewrite PBA %d (LBA %d)\n", pba, lba);

	result = sddr09_write_inplace(us, address>>1, info->blocksize,
				      info->pageshift, blockbuffer, 0);

	usb_stor_dbg(us, "sddr09_write_inplace returns %d\n", result);

#if 0
	{
		unsigned char status = 0;
		int result2 = sddr09_read_status(us, &status);
		if (result2)
			usb_stor_dbg(us, "cannot read status\n");
		else if (status != 0xc0)
			usb_stor_dbg(us, "status after write: 0x%x\n", status);
	}
#endif

#if 0
	{
		int result2 = sddr09_test_unit_ready(us);
	}
#endif

	return result;
}

static int
sddr09_write_data(struct us_data *us,
		  unsigned long address,
		  unsigned int sectors) {

	struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
	unsigned int lba, maxlba, page, pages;
	unsigned int pagelen, blocklen;
	unsigned char *blockbuffer;
	unsigned char *buffer;
	unsigned int len, offset;
	struct scatterlist *sg;
	int result;

	/* Figure out the initial LBA and page */
	lba = address >> info->blockshift;
	page = (address & info->blockmask);
	maxlba = info->capacity >> (info->pageshift + info->blockshift);
	if (lba >= maxlba)
		return -EIO;

	/*
	 * blockbuffer is used for reading in the old data, overwriting
	 * with the new data, and performing ECC calculations
	 */

	/*
	 * TODO: instead of doing kmalloc/kfree for each write,
	 * add a bufferpointer to the info structure
	 */

	pagelen = (1 << info->pageshift) + (1 << CONTROL_SHIFT);
	blocklen = (pagelen << info->blockshift);
	blockbuffer = kmalloc(blocklen, GFP_NOIO);
	if (!blockbuffer)
		return -ENOMEM;

	/*
	 * Since we don't write the user data directly to the device,
	 * 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 = min(sectors, (unsigned int) info->blocksize) * info->pagesize;
	buffer = kmalloc(len, GFP_NOIO);
	if (!buffer) {
		kfree(blockbuffer);
		return -ENOMEM;
	}

	result = 0;
	offset = 0;
	sg = NULL;

	while (sectors > 0) {

		/* Write as many sectors as possible in this block */

		pages = min(sectors, info->blocksize - page);
		len = (pages << info->pageshift);

		/* Not overflowing capacity? */
		if (lba >= maxlba) {
			usb_stor_dbg(us, "Error: Requested lba %u exceeds maximum %u\n",
				     lba, maxlba);
			result = -EIO;
			break;
		}

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

		result = sddr09_write_lba(us, lba, page, pages,
				buffer, blockbuffer);
		if (result)
			break;

		page = 0;
		lba++;
		sectors -= pages;
	}

	kfree(buffer);
	kfree(blockbuffer);

	return result;
}

static int
sddr09_read_control(struct us_data *us,
		unsigned long address,
		unsigned int blocks,
		unsigned char *content,
		int use_sg) {

	usb_stor_dbg(us, "Read control address %lu, blocks %d\n",
		     address, blocks);

	return sddr09_read21(us, address, blocks,
			     CONTROL_SHIFT, content, use_sg);
}

/*
 * Read Device ID Command: 12 bytes.
 * byte 0: opcode: ED
 *
 * Returns 2 bytes: Manufacturer ID and Device ID.
 * On more recent cards 3 bytes: the third byte is an option code A5
 * signifying that the secret command to read an 128-bit ID is available.
 * On still more recent cards 4 bytes: the fourth byte C0 means that
 * a second read ID cmd is available.
 */
static int
sddr09_read_deviceID(struct us_data *us, unsigned char *deviceID) {
	unsigned char *command = us->iobuf;
	unsigned char *content = us->iobuf;
	int result, i;

	memset(command, 0, 12);
	command[0] = 0xED;
	command[1] = LUNBITS;

	result = sddr09_send_scsi_command(us, command, 12);
	if (result)
		return result;

	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
			content, 64, NULL);

	for (i = 0; i < 4; i++)
		deviceID[i] = content[i];

	return (result == USB_STOR_XFER_GOOD ? 0 : -EIO);
}

static int
sddr09_get_wp(struct us_data *us, struct sddr09_card_info *info) {
	int result;
	unsigned char status;
	const char *wp_fmt;

	result = sddr09_read_status(us, &status);
	if (result) {
		usb_stor_dbg(us, "read_status fails\n");
		return result;
	}
	if ((status & 0x80) == 0) {
		info->flags |= SDDR09_WP;	/* write protected */
		wp_fmt = " WP";
	} else {
		wp_fmt = "";
	}
	usb_stor_dbg(us, "status 0x%02X%s%s%s%s\n", status, wp_fmt,
		     status & 0x40 ? " Ready" : "",
		     status & LUNBITS ? " Suspended" : "",
		     status & 0x01 ? " Error" : "");

	return 0;
}

#if 0
/*
 * Reset Command: 12 bytes.
 * byte 0: opcode: EB
 */
static int
sddr09_reset(struct us_data *us) {

	unsigned char *command = us->iobuf;

	memset(command, 0, 12);
	command[0] = 0xEB;
	command[1] = LUNBITS;

	return sddr09_send_scsi_command(us, command, 12);
}
#endif

static struct nand_flash_dev *
sddr09_get_cardinfo(struct us_data *us, unsigned char flags) {
	struct nand_flash_dev *cardinfo;
	unsigned char deviceID[4];
	char blurbtxt[256];
	int result;

	usb_stor_dbg(us, "Reading capacity...\n");

	result = sddr09_read_deviceID(us, deviceID);

	if (result) {
		usb_stor_dbg(us, "Result of read_deviceID is %d\n", result);
		printk(KERN_WARNING "sddr09: could not read card info\n");
		return NULL;
	}

	sprintf(blurbtxt, "sddr09: Found Flash card, ID = %4ph", deviceID);

	/* Byte 0 is the manufacturer */
	sprintf(blurbtxt + strlen(blurbtxt),
		": Manuf. %s",
		nand_flash_manufacturer(deviceID[0]));

	/* Byte 1 is the device type */
	cardinfo = nand_find_id(deviceID[1]);
	if (cardinfo) {
		/*
		 * MB or MiB? It is neither. A 16 MB card has
		 * 17301504 raw bytes, of which 16384000 are
		 * usable for user data.
		 */
		sprintf(blurbtxt + strlen(blurbtxt),
			", %d MB", 1<<(cardinfo->chipshift - 20));
	} else {
		sprintf(blurbtxt + strlen(blurbtxt),
			", type unrecognized");
	}

	/* Byte 2 is code to signal availability of 128-bit ID */
	if (deviceID[2] == 0xa5) {
		sprintf(blurbtxt + strlen(blurbtxt),
			", 128-bit ID");
	}

	/* Byte 3 announces the availability of another read ID command */
	if (deviceID[3] == 0xc0) {
		sprintf(blurbtxt + strlen(blurbtxt),
			", extra cmd");
	}

	if (flags & SDDR09_WP)
		sprintf(blurbtxt + strlen(blurbtxt),
			", WP");

	printk(KERN_WARNING "%s\n", blurbtxt);

	return cardinfo;
}

static int
sddr09_read_map(struct us_data *us) {

	struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
	int numblocks, alloc_len, alloc_blocks;
	int i, j, result;
	unsigned char *buffer, *buffer_end, *ptr;
	unsigned int lba, lbact;

	if (!info->capacity)
		return -1;

	/*
	 * size of a block is 1 << (blockshift + pageshift) bytes
	 * divide into the total capacity to get the number of blocks
	 */

	numblocks = info->capacity >> (info->blockshift + info->pageshift);

	/*
	 * read 64 bytes for every block (actually 1 << CONTROL_SHIFT)
	 * but only use a 64 KB buffer
	 * buffer size used must be a multiple of (1 << CONTROL_SHIFT)
	 */
#define SDDR09_READ_MAP_BUFSZ 65536

	alloc_blocks = min(numblocks, SDDR09_READ_MAP_BUFSZ >> CONTROL_SHIFT);
	alloc_len = (alloc_blocks << CONTROL_SHIFT);
	buffer = kmalloc(alloc_len, GFP_NOIO);
	if (!buffer) {
		result = -1;
		goto done;
	}
	buffer_end = buffer + alloc_len;

#undef SDDR09_READ_MAP_BUFSZ

	kfree(info->lba_to_pba);
	kfree(info->pba_to_lba);
	info->lba_to_pba = kmalloc_array(numblocks, sizeof(int), GFP_NOIO);
	info->pba_to_lba = kmalloc_array(numblocks, sizeof(int), GFP_NOIO);

	if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
		printk(KERN_WARNING "sddr09_read_map: out of memory\n");
		result = -1;
		goto done;
	}

	for (i = 0; i < numblocks; i++)
		info->lba_to_pba[i] = info->pba_to_lba[i] = UNDEF;

	/*
	 * Define lba-pba translation table
	 */

	ptr = buffer_end;
	for (i = 0; i < numblocks; i++) {
		ptr += (1 << CONTROL_SHIFT);
		if (ptr >= buffer_end) {
			unsigned long address;

			address = i << (info->pageshift + info->blockshift);
			result = sddr09_read_control(
				us, address>>1,
				min(alloc_blocks, numblocks - i),
				buffer, 0);
			if (result) {
				result = -1;
				goto done;
			}
			ptr = buffer;
		}

		if (i == 0 || i == 1) {
			info->pba_to_lba[i] = UNUSABLE;
			continue;
		}

		/* special PBAs have control field 0^16 */
		for (j = 0; j < 16; j++)
			if (ptr[j] != 0)
				goto nonz;
		info->pba_to_lba[i] = UNUSABLE;
		printk(KERN_WARNING "sddr09: PBA %d has no logical mapping\n",
		       i);
		continue;

	nonz:
		/* unwritten PBAs have control field FF^16 */
		for (j = 0; j < 16; j++)
			if (ptr[j] != 0xff)
				goto nonff;
		continue;

	nonff:
		/* normal PBAs start with six FFs */
		if (j < 6) {
			printk(KERN_WARNING
			       "sddr09: PBA %d has no logical mapping: "
			       "reserved area = %02X%02X%02X%02X "
			       "data status %02X block status %02X\n",
			       i, ptr[0], ptr[1], ptr[2], ptr[3],
			       ptr[4], ptr[5]);
			info->pba_to_lba[i] = UNUSABLE;
			continue;
		}

		if ((ptr[6] >> 4) != 0x01) {
			printk(KERN_WARNING
			       "sddr09: PBA %d has invalid address field "
			       "%02X%02X/%02X%02X\n",
			       i, ptr[6], ptr[7], ptr[11], ptr[12]);
			info->pba_to_lba[i] = UNUSABLE;
			continue;
		}

		/* check even parity */
		if (parity[ptr[6] ^ ptr[7]]) {
			printk(KERN_WARNING
			       "sddr09: Bad parity in LBA for block %d"
			       " (%02X %02X)\n", i, ptr[6], ptr[7]);
			info->pba_to_lba[i] = UNUSABLE;
			continue;
		}

		lba = short_pack(ptr[7], ptr[6]);
		lba = (lba & 0x07FF) >> 1;

		/*
		 * Every 1024 physical blocks ("zone"), the LBA numbers
		 * go back to zero, but are within a higher block of LBA's.
		 * Also, there is a maximum of 1000 LBA's per zone.
		 * In other words, in PBA 1024-2047 you will find LBA 0-999
		 * which are really LBA 1000-1999. This allows for 24 bad
		 * or special physical blocks per zone.
		 */

		if (lba >= 1000) {
			printk(KERN_WARNING
			       "sddr09: Bad low LBA %d for block %d\n",
			       lba, i);
			goto possibly_erase;
		}

		lba += 1000*(i/0x400);

		if (info->lba_to_pba[lba] != UNDEF) {
			printk(KERN_WARNING
			       "sddr09: LBA %d seen for PBA %d and %d\n",
			       lba, info->lba_to_pba[lba], i);
			goto possibly_erase;
		}

		info->pba_to_lba[i] = lba;
		info->lba_to_pba[lba] = i;
		continue;

	possibly_erase:
		if (erase_bad_lba_entries) {
			unsigned long address;

			address = (i << (info->pageshift + info->blockshift));
			sddr09_erase(us, address>>1);
			info->pba_to_lba[i] = UNDEF;
		} else
			info->pba_to_lba[i] = UNUSABLE;
	}

	/*
	 * Approximate capacity. This is not entirely correct yet,
	 * since a zone with less than 1000 usable pages leads to
	 * missing LBAs. Especially if it is the last zone, some
	 * LBAs can be past capacity.
	 */
	lbact = 0;
	for (i = 0; i < numblocks; i += 1024) {
		int ct = 0;

		for (j = 0; j < 1024 && i+j < numblocks; j++) {
			if (info->pba_to_lba[i+j] != UNUSABLE) {
				if (ct >= 1000)
					info->pba_to_lba[i+j] = SPARE;
				else
					ct++;
			}
		}
		lbact += ct;
	}
	info->lbact = lbact;
	usb_stor_dbg(us, "Found %d LBA's\n", lbact);
	result = 0;

 done:
	if (result != 0) {
		kfree(info->lba_to_pba);
		kfree(info->pba_to_lba);
		info->lba_to_pba = NULL;
		info->pba_to_lba = NULL;
	}
	kfree(buffer);
	return result;
}

static void
sddr09_card_info_destructor(void *extra) {
	struct sddr09_card_info *info = (struct sddr09_card_info *)extra;

	if (!info)
		return;

	kfree(info->lba_to_pba);
	kfree(info->pba_to_lba);
}

static int
sddr09_common_init(struct us_data *us) {
	int result;

	/* set the configuration -- STALL is an acceptable response here */
	if (us->pusb_dev->actconfig->desc.bConfigurationValue != 1) {
		usb_stor_dbg(us, "active config #%d != 1 ??\n",
			     us->pusb_dev->actconfig->desc.bConfigurationValue);
		return -EINVAL;
	}

	result = usb_reset_configuration(us->pusb_dev);
	usb_stor_dbg(us, "Result of usb_reset_configuration is %d\n", result);
	if (result == -EPIPE) {
		usb_stor_dbg(us, "-- stall on control interface\n");
	} else if (result != 0) {
		/* it's not a stall, but another error -- time to bail */
		usb_stor_dbg(us, "-- Unknown error.  Rejecting device\n");
		return -EINVAL;
	}

	us->extra = kzalloc(sizeof(struct sddr09_card_info), GFP_NOIO);
	if (!us->extra)
		return -ENOMEM;
	us->extra_destructor = sddr09_card_info_destructor;

	nand_init_ecc();
	return 0;
}


/*
 * This is needed at a very early stage. If this is not listed in the
 * unusual devices list but called from here then LUN 0 of the combo reader
 * is not recognized. But I do not know what precisely these calls do.
 */
static int
usb_stor_sddr09_dpcm_init(struct us_data *us) {
	int result;
	unsigned char *data = us->iobuf;

	result = sddr09_common_init(us);
	if (result)
		return result;

	result = sddr09_send_command(us, 0x01, USB_DIR_IN, data, 2);
	if (result) {
		usb_stor_dbg(us, "send_command fails\n");
		return result;
	}

	usb_stor_dbg(us, "%02X %02X\n", data[0], data[1]);
	// get 07 02

	result = sddr09_send_command(us, 0x08, USB_DIR_IN, data, 2);
	if (result) {
		usb_stor_dbg(us, "2nd send_command fails\n");
		return result;
	}

	usb_stor_dbg(us, "%02X %02X\n", data[0], data[1]);
	// get 07 00

	result = sddr09_request_sense(us, data, 18);
	if (result == 0 && data[2] != 0) {
		int j;
		for (j=0; j<18; j++)
			printk(" %02X", data[j]);
		printk("\n");
		// get 70 00 00 00 00 00 00 * 00 00 00 00 00 00
		// 70: current command
		// sense key 0, sense code 0, extd sense code 0
		// additional transfer length * = sizeof(data) - 7
		// Or: 70 00 06 00 00 00 00 0b 00 00 00 00 28 00 00 00 00 00
		// sense key 06, sense code 28: unit attention,
		// not ready to ready transition
	}

	// test unit ready

	return 0;		/* not result */
}

/*
 * Transport for the Microtech DPCM-USB
 */
static int dpcm_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int ret;

	usb_stor_dbg(us, "LUN=%d\n", (u8)srb->device->lun);

	switch (srb->device->lun) {
	case 0:

		/*
		 * LUN 0 corresponds to the CompactFlash card reader.
		 */
		ret = usb_stor_CB_transport(srb, us);
		break;

	case 1:

		/*
		 * LUN 1 corresponds to the SmartMedia card reader.
		 */

		/*
		 * Set the LUN to 0 (just in case).
		 */
		srb->device->lun = 0;
		ret = sddr09_transport(srb, us);
		srb->device->lun = 1;
		break;

	default:
	    usb_stor_dbg(us, "Invalid LUN %d\n", (u8)srb->device->lun);
		ret = USB_STOR_TRANSPORT_ERROR;
		break;
	}
	return ret;
}


/*
 * Transport for the Sandisk SDDR-09
 */
static int sddr09_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	static unsigned char sensekey = 0, sensecode = 0;
	static unsigned char havefakesense = 0;
	int result, i;
	unsigned char *ptr = us->iobuf;
	unsigned long capacity;
	unsigned int page, pages;

	struct sddr09_card_info *info;

	static unsigned char inquiry_response[8] = {
		0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
	};

	/* note: no block descriptor support */
	static unsigned char mode_page_01[19] = {
		0x00, 0x0F, 0x00, 0x0, 0x0, 0x0, 0x00,
		0x01, 0x0A,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	};

	info = (struct sddr09_card_info *)us->extra;

	if (srb->cmnd[0] == REQUEST_SENSE && havefakesense) {
		/* for a faked command, we have to follow with a faked sense */
		memset(ptr, 0, 18);
		ptr[0] = 0x70;
		ptr[2] = sensekey;
		ptr[7] = 11;
		ptr[12] = sensecode;
		usb_stor_set_xfer_buf(ptr, 18, srb);
		sensekey = sensecode = havefakesense = 0;
		return USB_STOR_TRANSPORT_GOOD;
	}

	havefakesense = 1;

	/*
	 * Dummy up a response for INQUIRY since SDDR09 doesn't
	 * respond to INQUIRY commands
	 */

	if (srb->cmnd[0] == INQUIRY) {
		memcpy(ptr, inquiry_response, 8);
		fill_inquiry_response(us, ptr, 36);
		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == READ_CAPACITY) {
		struct nand_flash_dev *cardinfo;

		sddr09_get_wp(us, info);	/* read WP bit */

		cardinfo = sddr09_get_cardinfo(us, info->flags);
		if (!cardinfo) {
			/* probably no media */
		init_error:
			sensekey = 0x02;	/* not ready */
			sensecode = 0x3a;	/* medium not present */
			return USB_STOR_TRANSPORT_FAILED;
		}

		info->capacity = (1 << cardinfo->chipshift);
		info->pageshift = cardinfo->pageshift;
		info->pagesize = (1 << info->pageshift);
		info->blockshift = cardinfo->blockshift;
		info->blocksize = (1 << info->blockshift);
		info->blockmask = info->blocksize - 1;

		// map initialization, must follow get_cardinfo()
		if (sddr09_read_map(us)) {
			/* probably out of memory */
			goto init_error;
		}

		// Report capacity

		capacity = (info->lbact << info->blockshift) - 1;

		((__be32 *) ptr)[0] = cpu_to_be32(capacity);

		// Report page size

		((__be32 *) ptr)[1] = cpu_to_be32(info->pagesize);
		usb_stor_set_xfer_buf(ptr, 8, srb);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == MODE_SENSE_10) {
		int modepage = (srb->cmnd[2] & 0x3F);

		/*
		 * They ask for the Read/Write error recovery page,
		 * or for all pages.
		 */
		/* %% We should check DBD %% */
		if (modepage == 0x01 || modepage == 0x3F) {
			usb_stor_dbg(us, "Dummy up request for mode page 0x%x\n",
				     modepage);

			memcpy(ptr, mode_page_01, sizeof(mode_page_01));
			((__be16*)ptr)[0] = cpu_to_be16(sizeof(mode_page_01) - 2);
			ptr[3] = (info->flags & SDDR09_WP) ? 0x80 : 0;
			usb_stor_set_xfer_buf(ptr, sizeof(mode_page_01), srb);
			return USB_STOR_TRANSPORT_GOOD;
		}

		sensekey = 0x05;	/* illegal request */
		sensecode = 0x24;	/* invalid field in CDB */
		return USB_STOR_TRANSPORT_FAILED;
	}

	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL)
		return USB_STOR_TRANSPORT_GOOD;

	havefakesense = 0;

	if (srb->cmnd[0] == READ_10) {

		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
		page <<= 16;
		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);

		usb_stor_dbg(us, "READ_10: read page %d pagect %d\n",
			     page, pages);

		result = sddr09_read_data(us, page, pages);
		return (result == 0 ? USB_STOR_TRANSPORT_GOOD :
				USB_STOR_TRANSPORT_ERROR);
	}

	if (srb->cmnd[0] == WRITE_10) {

		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
		page <<= 16;
		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);

		usb_stor_dbg(us, "WRITE_10: write page %d pagect %d\n",
			     page, pages);

		result = sddr09_write_data(us, page, pages);
		return (result == 0 ? USB_STOR_TRANSPORT_GOOD :
				USB_STOR_TRANSPORT_ERROR);
	}

	/*
	 * catch-all for all other commands, except
	 * pass TEST_UNIT_READY and REQUEST_SENSE through
	 */
	if (srb->cmnd[0] != TEST_UNIT_READY &&
	    srb->cmnd[0] != REQUEST_SENSE) {
		sensekey = 0x05;	/* illegal request */
		sensecode = 0x20;	/* invalid command */
		havefakesense = 1;
		return USB_STOR_TRANSPORT_FAILED;
	}

	for (; srb->cmd_len<12; srb->cmd_len++)
		srb->cmnd[srb->cmd_len] = 0;

	srb->cmnd[1] = LUNBITS;

	ptr[0] = 0;
	for (i=0; i<12; i++)
		sprintf(ptr+strlen(ptr), "%02X ", srb->cmnd[i]);

	usb_stor_dbg(us, "Send control for command %s\n", ptr);

	result = sddr09_send_scsi_command(us, srb->cmnd, 12);
	if (result) {
		usb_stor_dbg(us, "sddr09_send_scsi_command returns %d\n",
			     result);
		return USB_STOR_TRANSPORT_ERROR;
	}

	if (scsi_bufflen(srb) == 0)
		return USB_STOR_TRANSPORT_GOOD;

	if (srb->sc_data_direction == DMA_TO_DEVICE ||
	    srb->sc_data_direction == DMA_FROM_DEVICE) {
		unsigned int pipe = (srb->sc_data_direction == DMA_TO_DEVICE)
				? us->send_bulk_pipe : us->recv_bulk_pipe;

		usb_stor_dbg(us, "%s %d bytes\n",
			     (srb->sc_data_direction == DMA_TO_DEVICE) ?
			     "sending" : "receiving",
			     scsi_bufflen(srb));

		result = usb_stor_bulk_srb(us, pipe, srb);

		return (result == USB_STOR_XFER_GOOD ?
			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
	} 

	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Initialization routine for the sddr09 subdriver
 */
static int
usb_stor_sddr09_init(struct us_data *us) {
	return sddr09_common_init(us);
}

static struct scsi_host_template sddr09_host_template;

static int sddr09_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 - sddr09_usb_ids) + sddr09_unusual_dev_list,
			&sddr09_host_template);
	if (result)
		return result;

	if (us->protocol == USB_PR_DPCM_USB) {
		us->transport_name = "Control/Bulk-EUSB/SDDR09";
		us->transport = dpcm_transport;
		us->transport_reset = usb_stor_CB_reset;
		us->max_lun = 1;
	} else {
		us->transport_name = "EUSB/SDDR09";
		us->transport = sddr09_transport;
		us->transport_reset = usb_stor_CB_reset;
		us->max_lun = 0;
	}

	result = usb_stor_probe2(us);
	return result;
}

static struct usb_driver sddr09_driver = {
	.name =		DRV_NAME,
	.probe =	sddr09_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 =	sddr09_usb_ids,
	.soft_unbind =	1,
	.no_dynamic_id = 1,
};

module_usb_stor_driver(sddr09_driver, sddr09_host_template, DRV_NAME);