Free Electrons

Embedded Linux Experts

   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
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
 /*
  * A driver for the PCMCIA Smartcard Reader "Omnikey CardMan Mobile 4000"
  *
  * cm4000_cs.c support.linux@omnikey.com
  *
  * Tue Oct 23 11:32:43 GMT 2001 herp - cleaned up header files
  * Sun Jan 20 10:11:15 MET 2002 herp - added modversion header files
  * Thu Nov 14 16:34:11 GMT 2002 mh   - added PPS functionality
  * Tue Nov 19 16:36:27 GMT 2002 mh   - added SUSPEND/RESUME functionailty
  * Wed Jul 28 12:55:01 CEST 2004 mh  - kernel 2.6 adjustments
  *
  * current version: 2.4.0gm4
  *
  * (C) 2000,2001,2002,2003,2004 Omnikey AG
  *
  * (C) 2005-2006 Harald Welte <laforge@gnumonks.org>
  * 	- Adhere to Kernel process/coding-style.rst
  * 	- Port to 2.6.13 "new" style PCMCIA
  * 	- Check for copy_{from,to}_user return values
  * 	- Use nonseekable_open()
  * 	- add class interface for udev device creation
  *
  * All rights reserved. Licensed under dual BSD/GPL license.
  */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/bitrev.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ciscode.h>
#include <pcmcia/ds.h>

#include <linux/cm4000_cs.h>

/* #define ATR_CSUM */

#define reader_to_dev(x)	(&x->p_dev->dev)

/* n (debug level) is ignored */
/* additional debug output may be enabled by re-compiling with
 * CM4000_DEBUG set */
/* #define CM4000_DEBUG */
#define DEBUGP(n, rdr, x, args...) do { 		\
		dev_dbg(reader_to_dev(rdr), "%s:" x, 	\
			   __func__ , ## args);		\
	} while (0)

static DEFINE_MUTEX(cmm_mutex);

#define	T_1SEC		(HZ)
#define	T_10MSEC	msecs_to_jiffies(10)
#define	T_20MSEC	msecs_to_jiffies(20)
#define	T_40MSEC	msecs_to_jiffies(40)
#define	T_50MSEC	msecs_to_jiffies(50)
#define	T_100MSEC	msecs_to_jiffies(100)
#define	T_500MSEC	msecs_to_jiffies(500)

static void cm4000_release(struct pcmcia_device *link);

static int major;		/* major number we get from the kernel */

/* note: the first state has to have number 0 always */

#define	M_FETCH_ATR	0
#define	M_TIMEOUT_WAIT	1
#define	M_READ_ATR_LEN	2
#define	M_READ_ATR	3
#define	M_ATR_PRESENT	4
#define	M_BAD_CARD	5
#define M_CARDOFF	6

#define	LOCK_IO			0
#define	LOCK_MONITOR		1

#define IS_AUTOPPS_ACT		 6
#define	IS_PROCBYTE_PRESENT	 7
#define	IS_INVREV		 8
#define IS_ANY_T0		 9
#define	IS_ANY_T1		10
#define	IS_ATR_PRESENT		11
#define	IS_ATR_VALID		12
#define	IS_CMM_ABSENT		13
#define	IS_BAD_LENGTH		14
#define	IS_BAD_CSUM		15
#define	IS_BAD_CARD		16

#define REG_FLAGS0(x)		(x + 0)
#define REG_FLAGS1(x)		(x + 1)
#define REG_NUM_BYTES(x)	(x + 2)
#define REG_BUF_ADDR(x)		(x + 3)
#define REG_BUF_DATA(x)		(x + 4)
#define REG_NUM_SEND(x)		(x + 5)
#define REG_BAUDRATE(x)		(x + 6)
#define REG_STOPBITS(x)		(x + 7)

struct cm4000_dev {
	struct pcmcia_device *p_dev;

	unsigned char atr[MAX_ATR];
	unsigned char rbuf[512];
	unsigned char sbuf[512];

	wait_queue_head_t devq;		/* when removing cardman must not be
					   zeroed! */

	wait_queue_head_t ioq;		/* if IO is locked, wait on this Q */
	wait_queue_head_t atrq;		/* wait for ATR valid */
	wait_queue_head_t readq;	/* used by write to wake blk.read */

	/* warning: do not move this fields.
	 * initialising to zero depends on it - see ZERO_DEV below.  */
	unsigned char atr_csum;
	unsigned char atr_len_retry;
	unsigned short atr_len;
	unsigned short rlen;	/* bytes avail. after write */
	unsigned short rpos;	/* latest read pos. write zeroes */
	unsigned char procbyte;	/* T=0 procedure byte */
	unsigned char mstate;	/* state of card monitor */
	unsigned char cwarn;	/* slow down warning */
	unsigned char flags0;	/* cardman IO-flags 0 */
	unsigned char flags1;	/* cardman IO-flags 1 */
	unsigned int mdelay;	/* variable monitor speeds, in jiffies */

	unsigned int baudv;	/* baud value for speed */
	unsigned char ta1;
	unsigned char proto;	/* T=0, T=1, ... */
	unsigned long flags;	/* lock+flags (MONITOR,IO,ATR) * for concurrent
				   access */

	unsigned char pts[4];

	struct timer_list timer;	/* used to keep monitor running */
	int monitor_running;
};

#define	ZERO_DEV(dev)  						\
	memset(&dev->atr_csum,0,				\
		sizeof(struct cm4000_dev) - 			\
		offsetof(struct cm4000_dev, atr_csum))

static struct pcmcia_device *dev_table[CM4000_MAX_DEV];
static struct class *cmm_class;

/* This table doesn't use spaces after the comma between fields and thus
 * violates process/coding-style.rst.  However, I don't really think wrapping it around will
 * make it any clearer to read -HW */
static unsigned char fi_di_table[10][14] = {
/*FI     00   01   02   03   04   05   06   07   08   09   10   11   12   13 */
/*DI */
/* 0 */ {0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11},
/* 1 */ {0x01,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x91,0x11,0x11,0x11,0x11},
/* 2 */ {0x02,0x12,0x22,0x32,0x11,0x11,0x11,0x11,0x11,0x92,0xA2,0xB2,0x11,0x11},
/* 3 */ {0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x11,0x11,0x93,0xA3,0xB3,0xC3,0xD3},
/* 4 */ {0x04,0x14,0x24,0x34,0x44,0x54,0x64,0x11,0x11,0x94,0xA4,0xB4,0xC4,0xD4},
/* 5 */ {0x00,0x15,0x25,0x35,0x45,0x55,0x65,0x11,0x11,0x95,0xA5,0xB5,0xC5,0xD5},
/* 6 */ {0x06,0x16,0x26,0x36,0x46,0x56,0x66,0x11,0x11,0x96,0xA6,0xB6,0xC6,0xD6},
/* 7 */ {0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11},
/* 8 */ {0x08,0x11,0x28,0x38,0x48,0x58,0x68,0x11,0x11,0x98,0xA8,0xB8,0xC8,0xD8},
/* 9 */ {0x09,0x19,0x29,0x39,0x49,0x59,0x69,0x11,0x11,0x99,0xA9,0xB9,0xC9,0xD9}
};

#ifndef CM4000_DEBUG
#define	xoutb	outb
#define	xinb	inb
#else
static inline void xoutb(unsigned char val, unsigned short port)
{
	pr_debug("outb(val=%.2x,port=%.4x)\n", val, port);
	outb(val, port);
}
static inline unsigned char xinb(unsigned short port)
{
	unsigned char val;

	val = inb(port);
	pr_debug("%.2x=inb(%.4x)\n", val, port);

	return val;
}
#endif

static inline unsigned char invert_revert(unsigned char ch)
{
	return bitrev8(~ch);
}

static void str_invert_revert(unsigned char *b, int len)
{
	int i;

	for (i = 0; i < len; i++)
		b[i] = invert_revert(b[i]);
}

#define	ATRLENCK(dev,pos) \
	if (pos>=dev->atr_len || pos>=MAX_ATR) \
		goto return_0;

static unsigned int calc_baudv(unsigned char fidi)
{
	unsigned int wcrcf, wbrcf, fi_rfu, di_rfu;

	fi_rfu = 372;
	di_rfu = 1;

	/* FI */
	switch ((fidi >> 4) & 0x0F) {
	case 0x00:
		wcrcf = 372;
		break;
	case 0x01:
		wcrcf = 372;
		break;
	case 0x02:
		wcrcf = 558;
		break;
	case 0x03:
		wcrcf = 744;
		break;
	case 0x04:
		wcrcf = 1116;
		break;
	case 0x05:
		wcrcf = 1488;
		break;
	case 0x06:
		wcrcf = 1860;
		break;
	case 0x07:
		wcrcf = fi_rfu;
		break;
	case 0x08:
		wcrcf = fi_rfu;
		break;
	case 0x09:
		wcrcf = 512;
		break;
	case 0x0A:
		wcrcf = 768;
		break;
	case 0x0B:
		wcrcf = 1024;
		break;
	case 0x0C:
		wcrcf = 1536;
		break;
	case 0x0D:
		wcrcf = 2048;
		break;
	default:
		wcrcf = fi_rfu;
		break;
	}

	/* DI */
	switch (fidi & 0x0F) {
	case 0x00:
		wbrcf = di_rfu;
		break;
	case 0x01:
		wbrcf = 1;
		break;
	case 0x02:
		wbrcf = 2;
		break;
	case 0x03:
		wbrcf = 4;
		break;
	case 0x04:
		wbrcf = 8;
		break;
	case 0x05:
		wbrcf = 16;
		break;
	case 0x06:
		wbrcf = 32;
		break;
	case 0x07:
		wbrcf = di_rfu;
		break;
	case 0x08:
		wbrcf = 12;
		break;
	case 0x09:
		wbrcf = 20;
		break;
	default:
		wbrcf = di_rfu;
		break;
	}

	return (wcrcf / wbrcf);
}

static unsigned short io_read_num_rec_bytes(unsigned int iobase,
					    unsigned short *s)
{
	unsigned short tmp;

	tmp = *s = 0;
	do {
		*s = tmp;
		tmp = inb(REG_NUM_BYTES(iobase)) |
				(inb(REG_FLAGS0(iobase)) & 4 ? 0x100 : 0);
	} while (tmp != *s);

	return *s;
}

static int parse_atr(struct cm4000_dev *dev)
{
	unsigned char any_t1, any_t0;
	unsigned char ch, ifno;
	int ix, done;

	DEBUGP(3, dev, "-> parse_atr: dev->atr_len = %i\n", dev->atr_len);

	if (dev->atr_len < 3) {
		DEBUGP(5, dev, "parse_atr: atr_len < 3\n");
		return 0;
	}

	if (dev->atr[0] == 0x3f)
		set_bit(IS_INVREV, &dev->flags);
	else
		clear_bit(IS_INVREV, &dev->flags);
	ix = 1;
	ifno = 1;
	ch = dev->atr[1];
	dev->proto = 0;		/* XXX PROTO */
	any_t1 = any_t0 = done = 0;
	dev->ta1 = 0x11;	/* defaults to 9600 baud */
	do {
		if (ifno == 1 && (ch & 0x10)) {
			/* read first interface byte and TA1 is present */
			dev->ta1 = dev->atr[2];
			DEBUGP(5, dev, "Card says FiDi is 0x%.2x\n", dev->ta1);
			ifno++;
		} else if ((ifno == 2) && (ch & 0x10)) { /* TA(2) */
			dev->ta1 = 0x11;
			ifno++;
		}

		DEBUGP(5, dev, "Yi=%.2x\n", ch & 0xf0);
		ix += ((ch & 0x10) >> 4)	/* no of int.face chars */
		    +((ch & 0x20) >> 5)
		    + ((ch & 0x40) >> 6)
		    + ((ch & 0x80) >> 7);
		/* ATRLENCK(dev,ix); */
		if (ch & 0x80) {	/* TDi */
			ch = dev->atr[ix];
			if ((ch & 0x0f)) {
				any_t1 = 1;
				DEBUGP(5, dev, "card is capable of T=1\n");
			} else {
				any_t0 = 1;
				DEBUGP(5, dev, "card is capable of T=0\n");
			}
		} else
			done = 1;
	} while (!done);

	DEBUGP(5, dev, "ix=%d noHist=%d any_t1=%d\n",
	      ix, dev->atr[1] & 15, any_t1);
	if (ix + 1 + (dev->atr[1] & 0x0f) + any_t1 != dev->atr_len) {
		DEBUGP(5, dev, "length error\n");
		return 0;
	}
	if (any_t0)
		set_bit(IS_ANY_T0, &dev->flags);

	if (any_t1) {		/* compute csum */
		dev->atr_csum = 0;
#ifdef ATR_CSUM
		for (i = 1; i < dev->atr_len; i++)
			dev->atr_csum ^= dev->atr[i];
		if (dev->atr_csum) {
			set_bit(IS_BAD_CSUM, &dev->flags);
			DEBUGP(5, dev, "bad checksum\n");
			goto return_0;
		}
#endif
		if (any_t0 == 0)
			dev->proto = 1;	/* XXX PROTO */
		set_bit(IS_ANY_T1, &dev->flags);
	}

	return 1;
}

struct card_fixup {
	char atr[12];
	u_int8_t atr_len;
	u_int8_t stopbits;
};

static struct card_fixup card_fixups[] = {
	{	/* ACOS */
		.atr = { 0x3b, 0xb3, 0x11, 0x00, 0x00, 0x41, 0x01 },
		.atr_len = 7,
		.stopbits = 0x03,
	},
	{	/* Motorola */
		.atr = {0x3b, 0x76, 0x13, 0x00, 0x00, 0x80, 0x62, 0x07,
			0x41, 0x81, 0x81 },
		.atr_len = 11,
		.stopbits = 0x04,
	},
};

static void set_cardparameter(struct cm4000_dev *dev)
{
	int i;
	unsigned int iobase = dev->p_dev->resource[0]->start;
	u_int8_t stopbits = 0x02; /* ISO default */

	DEBUGP(3, dev, "-> set_cardparameter\n");

	dev->flags1 = dev->flags1 | (((dev->baudv - 1) & 0x0100) >> 8);
	xoutb(dev->flags1, REG_FLAGS1(iobase));
	DEBUGP(5, dev, "flags1 = 0x%02x\n", dev->flags1);

	/* set baudrate */
	xoutb((unsigned char)((dev->baudv - 1) & 0xFF), REG_BAUDRATE(iobase));

	DEBUGP(5, dev, "baudv = %i -> write 0x%02x\n", dev->baudv,
	      ((dev->baudv - 1) & 0xFF));

	/* set stopbits */
	for (i = 0; i < ARRAY_SIZE(card_fixups); i++) {
		if (!memcmp(dev->atr, card_fixups[i].atr,
			    card_fixups[i].atr_len))
			stopbits = card_fixups[i].stopbits;
	}
	xoutb(stopbits, REG_STOPBITS(iobase));

	DEBUGP(3, dev, "<- set_cardparameter\n");
}

static int set_protocol(struct cm4000_dev *dev, struct ptsreq *ptsreq)
{

	unsigned long tmp, i;
	unsigned short num_bytes_read;
	unsigned char pts_reply[4];
	ssize_t rc;
	unsigned int iobase = dev->p_dev->resource[0]->start;

	rc = 0;

	DEBUGP(3, dev, "-> set_protocol\n");
	DEBUGP(5, dev, "ptsreq->Protocol = 0x%.8x, ptsreq->Flags=0x%.8x, "
		 "ptsreq->pts1=0x%.2x, ptsreq->pts2=0x%.2x, "
		 "ptsreq->pts3=0x%.2x\n", (unsigned int)ptsreq->protocol,
		 (unsigned int)ptsreq->flags, ptsreq->pts1, ptsreq->pts2,
		 ptsreq->pts3);

	/* Fill PTS structure */
	dev->pts[0] = 0xff;
	dev->pts[1] = 0x00;
	tmp = ptsreq->protocol;
	while ((tmp = (tmp >> 1)) > 0)
		dev->pts[1]++;
	dev->proto = dev->pts[1];	/* Set new protocol */
	dev->pts[1] = (0x01 << 4) | (dev->pts[1]);

	/* Correct Fi/Di according to CM4000 Fi/Di table */
	DEBUGP(5, dev, "Ta(1) from ATR is 0x%.2x\n", dev->ta1);
	/* set Fi/Di according to ATR TA(1) */
	dev->pts[2] = fi_di_table[dev->ta1 & 0x0F][(dev->ta1 >> 4) & 0x0F];

	/* Calculate PCK character */
	dev->pts[3] = dev->pts[0] ^ dev->pts[1] ^ dev->pts[2];

	DEBUGP(5, dev, "pts0=%.2x, pts1=%.2x, pts2=%.2x, pts3=%.2x\n",
	       dev->pts[0], dev->pts[1], dev->pts[2], dev->pts[3]);

	/* check card convention */
	if (test_bit(IS_INVREV, &dev->flags))
		str_invert_revert(dev->pts, 4);

	/* reset SM */
	xoutb(0x80, REG_FLAGS0(iobase));

	/* Enable access to the message buffer */
	DEBUGP(5, dev, "Enable access to the messages buffer\n");
	dev->flags1 = 0x20	/* T_Active */
	    | (test_bit(IS_INVREV, &dev->flags) ? 0x02 : 0x00) /* inv parity */
	    | ((dev->baudv >> 8) & 0x01);	/* MSB-baud */
	xoutb(dev->flags1, REG_FLAGS1(iobase));

	DEBUGP(5, dev, "Enable message buffer -> flags1 = 0x%.2x\n",
	       dev->flags1);

	/* write challenge to the buffer */
	DEBUGP(5, dev, "Write challenge to buffer: ");
	for (i = 0; i < 4; i++) {
		xoutb(i, REG_BUF_ADDR(iobase));
		xoutb(dev->pts[i], REG_BUF_DATA(iobase));	/* buf data */
#ifdef CM4000_DEBUG
		pr_debug("0x%.2x ", dev->pts[i]);
	}
	pr_debug("\n");
#else
	}
#endif

	/* set number of bytes to write */
	DEBUGP(5, dev, "Set number of bytes to write\n");
	xoutb(0x04, REG_NUM_SEND(iobase));

	/* Trigger CARDMAN CONTROLLER */
	xoutb(0x50, REG_FLAGS0(iobase));

	/* Monitor progress */
	/* wait for xmit done */
	DEBUGP(5, dev, "Waiting for NumRecBytes getting valid\n");

	for (i = 0; i < 100; i++) {
		if (inb(REG_FLAGS0(iobase)) & 0x08) {
			DEBUGP(5, dev, "NumRecBytes is valid\n");
			break;
		}
		mdelay(10);
	}
	if (i == 100) {
		DEBUGP(5, dev, "Timeout waiting for NumRecBytes getting "
		       "valid\n");
		rc = -EIO;
		goto exit_setprotocol;
	}

	DEBUGP(5, dev, "Reading NumRecBytes\n");
	for (i = 0; i < 100; i++) {
		io_read_num_rec_bytes(iobase, &num_bytes_read);
		if (num_bytes_read >= 4) {
			DEBUGP(2, dev, "NumRecBytes = %i\n", num_bytes_read);
			break;
		}
		mdelay(10);
	}

	/* check whether it is a short PTS reply? */
	if (num_bytes_read == 3)
		i = 0;

	if (i == 100) {
		DEBUGP(5, dev, "Timeout reading num_bytes_read\n");
		rc = -EIO;
		goto exit_setprotocol;
	}

	DEBUGP(5, dev, "Reset the CARDMAN CONTROLLER\n");
	xoutb(0x80, REG_FLAGS0(iobase));

	/* Read PPS reply */
	DEBUGP(5, dev, "Read PPS reply\n");
	for (i = 0; i < num_bytes_read; i++) {
		xoutb(i, REG_BUF_ADDR(iobase));
		pts_reply[i] = inb(REG_BUF_DATA(iobase));
	}

#ifdef CM4000_DEBUG
	DEBUGP(2, dev, "PTSreply: ");
	for (i = 0; i < num_bytes_read; i++) {
		pr_debug("0x%.2x ", pts_reply[i]);
	}
	pr_debug("\n");
#endif	/* CM4000_DEBUG */

	DEBUGP(5, dev, "Clear Tactive in Flags1\n");
	xoutb(0x20, REG_FLAGS1(iobase));

	/* Compare ptsreq and ptsreply */
	if ((dev->pts[0] == pts_reply[0]) &&
	    (dev->pts[1] == pts_reply[1]) &&
	    (dev->pts[2] == pts_reply[2]) && (dev->pts[3] == pts_reply[3])) {
		/* setcardparameter according to PPS */
		dev->baudv = calc_baudv(dev->pts[2]);
		set_cardparameter(dev);
	} else if ((dev->pts[0] == pts_reply[0]) &&
		   ((dev->pts[1] & 0xef) == pts_reply[1]) &&
		   ((pts_reply[0] ^ pts_reply[1]) == pts_reply[2])) {
		/* short PTS reply, set card parameter to default values */
		dev->baudv = calc_baudv(0x11);
		set_cardparameter(dev);
	} else
		rc = -EIO;

exit_setprotocol:
	DEBUGP(3, dev, "<- set_protocol\n");
	return rc;
}

static int io_detect_cm4000(unsigned int iobase, struct cm4000_dev *dev)
{

	/* note: statemachine is assumed to be reset */
	if (inb(REG_FLAGS0(iobase)) & 8) {
		clear_bit(IS_ATR_VALID, &dev->flags);
		set_bit(IS_CMM_ABSENT, &dev->flags);
		return 0;	/* detect CMM = 1 -> failure */
	}
	/* xoutb(0x40, REG_FLAGS1(iobase)); detectCMM */
	xoutb(dev->flags1 | 0x40, REG_FLAGS1(iobase));
	if ((inb(REG_FLAGS0(iobase)) & 8) == 0) {
		clear_bit(IS_ATR_VALID, &dev->flags);
		set_bit(IS_CMM_ABSENT, &dev->flags);
		return 0;	/* detect CMM=0 -> failure */
	}
	/* clear detectCMM again by restoring original flags1 */
	xoutb(dev->flags1, REG_FLAGS1(iobase));
	return 1;
}

static void terminate_monitor(struct cm4000_dev *dev)
{

	/* tell the monitor to stop and wait until
	 * it terminates.
	 */
	DEBUGP(3, dev, "-> terminate_monitor\n");
	wait_event_interruptible(dev->devq,
				 test_and_set_bit(LOCK_MONITOR,
						  (void *)&dev->flags));

	/* now, LOCK_MONITOR has been set.
	 * allow a last cycle in the monitor.
	 * the monitor will indicate that it has
	 * finished by clearing this bit.
	 */
	DEBUGP(5, dev, "Now allow last cycle of monitor!\n");
	while (test_bit(LOCK_MONITOR, (void *)&dev->flags))
		msleep(25);

	DEBUGP(5, dev, "Delete timer\n");
	del_timer_sync(&dev->timer);
#ifdef CM4000_DEBUG
	dev->monitor_running = 0;
#endif

	DEBUGP(3, dev, "<- terminate_monitor\n");
}

/*
 * monitor the card every 50msec. as a side-effect, retrieve the
 * atr once a card is inserted. another side-effect of retrieving the
 * atr is that the card will be powered on, so there is no need to
 * power on the card explicitly from the application: the driver
 * is already doing that for you.
 */

static void monitor_card(unsigned long p)
{
	struct cm4000_dev *dev = (struct cm4000_dev *) p;
	unsigned int iobase = dev->p_dev->resource[0]->start;
	unsigned short s;
	struct ptsreq ptsreq;
	int i, atrc;

	DEBUGP(7, dev, "->  monitor_card\n");

	/* if someone has set the lock for us: we're done! */
	if (test_and_set_bit(LOCK_MONITOR, &dev->flags)) {
		DEBUGP(4, dev, "About to stop monitor\n");
		/* no */
		dev->rlen =
		    dev->rpos =
		    dev->atr_csum = dev->atr_len_retry = dev->cwarn = 0;
		dev->mstate = M_FETCH_ATR;
		clear_bit(LOCK_MONITOR, &dev->flags);
		/* close et al. are sleeping on devq, so wake it */
		wake_up_interruptible(&dev->devq);
		DEBUGP(2, dev, "<- monitor_card (we are done now)\n");
		return;
	}

	/* try to lock io: if it is already locked, just add another timer */
	if (test_and_set_bit(LOCK_IO, (void *)&dev->flags)) {
		DEBUGP(4, dev, "Couldn't get IO lock\n");
		goto return_with_timer;
	}

	/* is a card/a reader inserted at all ? */
	dev->flags0 = xinb(REG_FLAGS0(iobase));
	DEBUGP(7, dev, "dev->flags0 = 0x%2x\n", dev->flags0);
	DEBUGP(7, dev, "smartcard present: %s\n",
	       dev->flags0 & 1 ? "yes" : "no");
	DEBUGP(7, dev, "cardman present: %s\n",
	       dev->flags0 == 0xff ? "no" : "yes");

	if ((dev->flags0 & 1) == 0	/* no smartcard inserted */
	    || dev->flags0 == 0xff) {	/* no cardman inserted */
		/* no */
		dev->rlen =
		    dev->rpos =
		    dev->atr_csum = dev->atr_len_retry = dev->cwarn = 0;
		dev->mstate = M_FETCH_ATR;

		dev->flags &= 0x000000ff; /* only keep IO and MONITOR locks */

		if (dev->flags0 == 0xff) {
			DEBUGP(4, dev, "set IS_CMM_ABSENT bit\n");
			set_bit(IS_CMM_ABSENT, &dev->flags);
		} else if (test_bit(IS_CMM_ABSENT, &dev->flags)) {
			DEBUGP(4, dev, "clear IS_CMM_ABSENT bit "
			       "(card is removed)\n");
			clear_bit(IS_CMM_ABSENT, &dev->flags);
		}

		goto release_io;
	} else if ((dev->flags0 & 1) && test_bit(IS_CMM_ABSENT, &dev->flags)) {
		/* cardman and card present but cardman was absent before
		 * (after suspend with inserted card) */
		DEBUGP(4, dev, "clear IS_CMM_ABSENT bit (card is inserted)\n");
		clear_bit(IS_CMM_ABSENT, &dev->flags);
	}

	if (test_bit(IS_ATR_VALID, &dev->flags) == 1) {
		DEBUGP(7, dev, "believe ATR is already valid (do nothing)\n");
		goto release_io;
	}

	switch (dev->mstate) {
		unsigned char flags0;
	case M_CARDOFF:
		DEBUGP(4, dev, "M_CARDOFF\n");
		flags0 = inb(REG_FLAGS0(iobase));
		if (flags0 & 0x02) {
			/* wait until Flags0 indicate power is off */
			dev->mdelay = T_10MSEC;
		} else {
			/* Flags0 indicate power off and no card inserted now;
			 * Reset CARDMAN CONTROLLER */
			xoutb(0x80, REG_FLAGS0(iobase));

			/* prepare for fetching ATR again: after card off ATR
			 * is read again automatically */
			dev->rlen =
			    dev->rpos =
			    dev->atr_csum =
			    dev->atr_len_retry = dev->cwarn = 0;
			dev->mstate = M_FETCH_ATR;

			/* minimal gap between CARDOFF and read ATR is 50msec */
			dev->mdelay = T_50MSEC;
		}
		break;
	case M_FETCH_ATR:
		DEBUGP(4, dev, "M_FETCH_ATR\n");
		xoutb(0x80, REG_FLAGS0(iobase));
		DEBUGP(4, dev, "Reset BAUDV to 9600\n");
		dev->baudv = 0x173;	/* 9600 */
		xoutb(0x02, REG_STOPBITS(iobase));	/* stopbits=2 */
		xoutb(0x73, REG_BAUDRATE(iobase));	/* baud value */
		xoutb(0x21, REG_FLAGS1(iobase));	/* T_Active=1, baud
							   value */
		/* warm start vs. power on: */
		xoutb(dev->flags0 & 2 ? 0x46 : 0x44, REG_FLAGS0(iobase));
		dev->mdelay = T_40MSEC;
		dev->mstate = M_TIMEOUT_WAIT;
		break;
	case M_TIMEOUT_WAIT:
		DEBUGP(4, dev, "M_TIMEOUT_WAIT\n");
		/* numRecBytes */
		io_read_num_rec_bytes(iobase, &dev->atr_len);
		dev->mdelay = T_10MSEC;
		dev->mstate = M_READ_ATR_LEN;
		break;
	case M_READ_ATR_LEN:
		DEBUGP(4, dev, "M_READ_ATR_LEN\n");
		/* infinite loop possible, since there is no timeout */

#define	MAX_ATR_LEN_RETRY	100

		if (dev->atr_len == io_read_num_rec_bytes(iobase, &s)) {
			if (dev->atr_len_retry++ >= MAX_ATR_LEN_RETRY) {					/* + XX msec */
				dev->mdelay = T_10MSEC;
				dev->mstate = M_READ_ATR;
			}
		} else {
			dev->atr_len = s;
			dev->atr_len_retry = 0;	/* set new timeout */
		}

		DEBUGP(4, dev, "Current ATR_LEN = %i\n", dev->atr_len);
		break;
	case M_READ_ATR:
		DEBUGP(4, dev, "M_READ_ATR\n");
		xoutb(0x80, REG_FLAGS0(iobase));	/* reset SM */
		for (i = 0; i < dev->atr_len; i++) {
			xoutb(i, REG_BUF_ADDR(iobase));
			dev->atr[i] = inb(REG_BUF_DATA(iobase));
		}
		/* Deactivate T_Active flags */
		DEBUGP(4, dev, "Deactivate T_Active flags\n");
		dev->flags1 = 0x01;
		xoutb(dev->flags1, REG_FLAGS1(iobase));

		/* atr is present (which doesn't mean it's valid) */
		set_bit(IS_ATR_PRESENT, &dev->flags);
		if (dev->atr[0] == 0x03)
			str_invert_revert(dev->atr, dev->atr_len);
		atrc = parse_atr(dev);
		if (atrc == 0) {	/* atr invalid */
			dev->mdelay = 0;
			dev->mstate = M_BAD_CARD;
		} else {
			dev->mdelay = T_50MSEC;
			dev->mstate = M_ATR_PRESENT;
			set_bit(IS_ATR_VALID, &dev->flags);
		}

		if (test_bit(IS_ATR_VALID, &dev->flags) == 1) {
			DEBUGP(4, dev, "monitor_card: ATR valid\n");
 			/* if ta1 == 0x11, no PPS necessary (default values) */
			/* do not do PPS with multi protocol cards */
			if ((test_bit(IS_AUTOPPS_ACT, &dev->flags) == 0) &&
			    (dev->ta1 != 0x11) &&
			    !(test_bit(IS_ANY_T0, &dev->flags) &&
			    test_bit(IS_ANY_T1, &dev->flags))) {
				DEBUGP(4, dev, "Perform AUTOPPS\n");
				set_bit(IS_AUTOPPS_ACT, &dev->flags);
				ptsreq.protocol = (0x01 << dev->proto);
				ptsreq.flags = 0x01;
				ptsreq.pts1 = 0x00;
				ptsreq.pts2 = 0x00;
				ptsreq.pts3 = 0x00;
				if (set_protocol(dev, &ptsreq) == 0) {
					DEBUGP(4, dev, "AUTOPPS ret SUCC\n");
					clear_bit(IS_AUTOPPS_ACT, &dev->flags);
					wake_up_interruptible(&dev->atrq);
				} else {
					DEBUGP(4, dev, "AUTOPPS failed: "
					       "repower using defaults\n");
					/* prepare for repowering  */
					clear_bit(IS_ATR_PRESENT, &dev->flags);
					clear_bit(IS_ATR_VALID, &dev->flags);
					dev->rlen =
					    dev->rpos =
					    dev->atr_csum =
					    dev->atr_len_retry = dev->cwarn = 0;
					dev->mstate = M_FETCH_ATR;

					dev->mdelay = T_50MSEC;
				}
			} else {
				/* for cards which use slightly different
				 * params (extra guard time) */
				set_cardparameter(dev);
				if (test_bit(IS_AUTOPPS_ACT, &dev->flags) == 1)
					DEBUGP(4, dev, "AUTOPPS already active "
					       "2nd try:use default values\n");
				if (dev->ta1 == 0x11)
					DEBUGP(4, dev, "No AUTOPPS necessary "
					       "TA(1)==0x11\n");
				if (test_bit(IS_ANY_T0, &dev->flags)
				    && test_bit(IS_ANY_T1, &dev->flags))
					DEBUGP(4, dev, "Do NOT perform AUTOPPS "
					       "with multiprotocol cards\n");
				clear_bit(IS_AUTOPPS_ACT, &dev->flags);
				wake_up_interruptible(&dev->atrq);
			}
		} else {
			DEBUGP(4, dev, "ATR invalid\n");
			wake_up_interruptible(&dev->atrq);
		}
		break;
	case M_BAD_CARD:
		DEBUGP(4, dev, "M_BAD_CARD\n");
		/* slow down warning, but prompt immediately after insertion */
		if (dev->cwarn == 0 || dev->cwarn == 10) {
			set_bit(IS_BAD_CARD, &dev->flags);
			dev_warn(&dev->p_dev->dev, MODULE_NAME ": ");
			if (test_bit(IS_BAD_CSUM, &dev->flags)) {
				DEBUGP(4, dev, "ATR checksum (0x%.2x, should "
				       "be zero) failed\n", dev->atr_csum);
			}
#ifdef CM4000_DEBUG
			else if (test_bit(IS_BAD_LENGTH, &dev->flags)) {
				DEBUGP(4, dev, "ATR length error\n");
			} else {
				DEBUGP(4, dev, "card damaged or wrong way "
					"inserted\n");
			}
#endif
			dev->cwarn = 0;
			wake_up_interruptible(&dev->atrq);	/* wake open */
		}
		dev->cwarn++;
		dev->mdelay = T_100MSEC;
		dev->mstate = M_FETCH_ATR;
		break;
	default:
		DEBUGP(7, dev, "Unknown action\n");
		break;		/* nothing */
	}

release_io:
	DEBUGP(7, dev, "release_io\n");
	clear_bit(LOCK_IO, &dev->flags);
	wake_up_interruptible(&dev->ioq);	/* whoever needs IO */

return_with_timer:
	DEBUGP(7, dev, "<- monitor_card (returns with timer)\n");
	mod_timer(&dev->timer, jiffies + dev->mdelay);
	clear_bit(LOCK_MONITOR, &dev->flags);
}

/* Interface to userland (file_operations) */

static ssize_t cmm_read(struct file *filp, __user char *buf, size_t count,
			loff_t *ppos)
{
	struct cm4000_dev *dev = filp->private_data;
	unsigned int iobase = dev->p_dev->resource[0]->start;
	ssize_t rc;
	int i, j, k;

	DEBUGP(2, dev, "-> cmm_read(%s,%d)\n", current->comm, current->pid);

	if (count == 0)		/* according to manpage */
		return 0;

	if (!pcmcia_dev_present(dev->p_dev) || /* device removed */
	    test_bit(IS_CMM_ABSENT, &dev->flags))
		return -ENODEV;

	if (test_bit(IS_BAD_CSUM, &dev->flags))
		return -EIO;

	/* also see the note about this in cmm_write */
	if (wait_event_interruptible
	    (dev->atrq,
	     ((filp->f_flags & O_NONBLOCK)
	      || (test_bit(IS_ATR_PRESENT, (void *)&dev->flags) != 0)))) {
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

	if (test_bit(IS_ATR_VALID, &dev->flags) == 0)
		return -EIO;

	/* this one implements blocking IO */
	if (wait_event_interruptible
	    (dev->readq,
	     ((filp->f_flags & O_NONBLOCK) || (dev->rpos < dev->rlen)))) {
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

	/* lock io */
	if (wait_event_interruptible
	    (dev->ioq,
	     ((filp->f_flags & O_NONBLOCK)
	      || (test_and_set_bit(LOCK_IO, (void *)&dev->flags) == 0)))) {
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

	rc = 0;
	dev->flags0 = inb(REG_FLAGS0(iobase));
	if ((dev->flags0 & 1) == 0	/* no smartcard inserted */
	    || dev->flags0 == 0xff) {	/* no cardman inserted */
		clear_bit(IS_ATR_VALID, &dev->flags);
		if (dev->flags0 & 1) {
			set_bit(IS_CMM_ABSENT, &dev->flags);
			rc = -ENODEV;
		} else {
			rc = -EIO;
		}
		goto release_io;
	}

	DEBUGP(4, dev, "begin read answer\n");
	j = min(count, (size_t)(dev->rlen - dev->rpos));
	k = dev->rpos;
	if (k + j > 255)
		j = 256 - k;
	DEBUGP(4, dev, "read1 j=%d\n", j);
	for (i = 0; i < j; i++) {
		xoutb(k++, REG_BUF_ADDR(iobase));
		dev->rbuf[i] = xinb(REG_BUF_DATA(iobase));
	}
	j = min(count, (size_t)(dev->rlen - dev->rpos));
	if (k + j > 255) {
		DEBUGP(4, dev, "read2 j=%d\n", j);
		dev->flags1 |= 0x10;	/* MSB buf addr set */
		xoutb(dev->flags1, REG_FLAGS1(iobase));
		for (; i < j; i++) {
			xoutb(k++, REG_BUF_ADDR(iobase));
			dev->rbuf[i] = xinb(REG_BUF_DATA(iobase));
		}
	}

	if (dev->proto == 0 && count > dev->rlen - dev->rpos && i) {
		DEBUGP(4, dev, "T=0 and count > buffer\n");
		dev->rbuf[i] = dev->rbuf[i - 1];
		dev->rbuf[i - 1] = dev->procbyte;
		j++;
	}
	count = j;

	dev->rpos = dev->rlen + 1;

	/* Clear T1Active */
	DEBUGP(4, dev, "Clear T1Active\n");
	dev->flags1 &= 0xdf;
	xoutb(dev->flags1, REG_FLAGS1(iobase));

	xoutb(0, REG_FLAGS1(iobase));	/* clear detectCMM */
	/* last check before exit */
	if (!io_detect_cm4000(iobase, dev)) {
		rc = -ENODEV;
		goto release_io;
	}

	if (test_bit(IS_INVREV, &dev->flags) && count > 0)
		str_invert_revert(dev->rbuf, count);

	if (copy_to_user(buf, dev->rbuf, count))
		rc = -EFAULT;

release_io:
	clear_bit(LOCK_IO, &dev->flags);
	wake_up_interruptible(&dev->ioq);

	DEBUGP(2, dev, "<- cmm_read returns: rc = %zi\n",
	       (rc < 0 ? rc : count));
	return rc < 0 ? rc : count;
}

static ssize_t cmm_write(struct file *filp, const char __user *buf,
			 size_t count, loff_t *ppos)
{
	struct cm4000_dev *dev = filp->private_data;
	unsigned int iobase = dev->p_dev->resource[0]->start;
	unsigned short s;
	unsigned char tmp;
	unsigned char infolen;
	unsigned char sendT0;
	unsigned short nsend;
	unsigned short nr;
	ssize_t rc;
	int i;

	DEBUGP(2, dev, "-> cmm_write(%s,%d)\n", current->comm, current->pid);

	if (count == 0)		/* according to manpage */
		return 0;

	if (dev->proto == 0 && count < 4) {
		/* T0 must have at least 4 bytes */
		DEBUGP(4, dev, "T0 short write\n");
		return -EIO;
	}

	nr = count & 0x1ff;	/* max bytes to write */

	sendT0 = dev->proto ? 0 : nr > 5 ? 0x08 : 0;

	if (!pcmcia_dev_present(dev->p_dev) || /* device removed */
	    test_bit(IS_CMM_ABSENT, &dev->flags))
		return -ENODEV;

	if (test_bit(IS_BAD_CSUM, &dev->flags)) {
		DEBUGP(4, dev, "bad csum\n");
		return -EIO;
	}

	/*
	 * wait for atr to become valid.
	 * note: it is important to lock this code. if we dont, the monitor
	 * could be run between test_bit and the call to sleep on the
	 * atr-queue.  if *then* the monitor detects atr valid, it will wake up
	 * any process on the atr-queue, *but* since we have been interrupted,
	 * we do not yet sleep on this queue. this would result in a missed
	 * wake_up and the calling process would sleep forever (until
	 * interrupted).  also, do *not* restore_flags before sleep_on, because
	 * this could result in the same situation!
	 */
	if (wait_event_interruptible
	    (dev->atrq,
	     ((filp->f_flags & O_NONBLOCK)
	      || (test_bit(IS_ATR_PRESENT, (void *)&dev->flags) != 0)))) {
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

	if (test_bit(IS_ATR_VALID, &dev->flags) == 0) {	/* invalid atr */
		DEBUGP(4, dev, "invalid ATR\n");
		return -EIO;
	}

	/* lock io */
	if (wait_event_interruptible
	    (dev->ioq,
	     ((filp->f_flags & O_NONBLOCK)
	      || (test_and_set_bit(LOCK_IO, (void *)&dev->flags) == 0)))) {
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

	if (copy_from_user(dev->sbuf, buf, ((count > 512) ? 512 : count)))
		return -EFAULT;

	rc = 0;
	dev->flags0 = inb(REG_FLAGS0(iobase));
	if ((dev->flags0 & 1) == 0	/* no smartcard inserted */
	    || dev->flags0 == 0xff) {	/* no cardman inserted */
		clear_bit(IS_ATR_VALID, &dev->flags);
		if (dev->flags0 & 1) {
			set_bit(IS_CMM_ABSENT, &dev->flags);
			rc = -ENODEV;
		} else {
			DEBUGP(4, dev, "IO error\n");
			rc = -EIO;
		}
		goto release_io;
	}

	xoutb(0x80, REG_FLAGS0(iobase));	/* reset SM  */

	if (!io_detect_cm4000(iobase, dev)) {
		rc = -ENODEV;
		goto release_io;
	}

	/* reflect T=0 send/read mode in flags1 */
	dev->flags1 |= (sendT0);

	set_cardparameter(dev);

	/* dummy read, reset flag procedure received */
	tmp = inb(REG_FLAGS1(iobase));

	dev->flags1 = 0x20	/* T_Active */
	    | (sendT0)
	    | (test_bit(IS_INVREV, &dev->flags) ? 2 : 0)/* inverse parity  */
	    | (((dev->baudv - 1) & 0x0100) >> 8);	/* MSB-Baud */
	DEBUGP(1, dev, "set dev->flags1 = 0x%.2x\n", dev->flags1);
	xoutb(dev->flags1, REG_FLAGS1(iobase));

	/* xmit data */
	DEBUGP(4, dev, "Xmit data\n");
	for (i = 0; i < nr; i++) {
		if (i >= 256) {
			dev->flags1 = 0x20	/* T_Active */
			    | (sendT0)	/* SendT0 */
				/* inverse parity: */
			    | (test_bit(IS_INVREV, &dev->flags) ? 2 : 0)
			    | (((dev->baudv - 1) & 0x0100) >> 8) /* MSB-Baud */
			    | 0x10;	/* set address high */
			DEBUGP(4, dev, "dev->flags = 0x%.2x - set address "
			       "high\n", dev->flags1);
			xoutb(dev->flags1, REG_FLAGS1(iobase));
		}
		if (test_bit(IS_INVREV, &dev->flags)) {
			DEBUGP(4, dev, "Apply inverse convention for 0x%.2x "
				"-> 0x%.2x\n", (unsigned char)dev->sbuf[i],
			      invert_revert(dev->sbuf[i]));
			xoutb(i, REG_BUF_ADDR(iobase));
			xoutb(invert_revert(dev->sbuf[i]),
			      REG_BUF_DATA(iobase));
		} else {
			xoutb(i, REG_BUF_ADDR(iobase));
			xoutb(dev->sbuf[i], REG_BUF_DATA(iobase));
		}
	}
	DEBUGP(4, dev, "Xmit done\n");

	if (dev->proto == 0) {
		/* T=0 proto: 0 byte reply  */
		if (nr == 4) {
			DEBUGP(4, dev, "T=0 assumes 0 byte reply\n");
			xoutb(i, REG_BUF_ADDR(iobase));
			if (test_bit(IS_INVREV, &dev->flags))
				xoutb(0xff, REG_BUF_DATA(iobase));
			else
				xoutb(0x00, REG_BUF_DATA(iobase));
		}

		/* numSendBytes */
		if (sendT0)
			nsend = nr;
		else {
			if (nr == 4)
				nsend = 5;
			else {
				nsend = 5 + (unsigned char)dev->sbuf[4];
				if (dev->sbuf[4] == 0)
					nsend += 0x100;
			}
		}
	} else
		nsend = nr;

	/* T0: output procedure byte */
	if (test_bit(IS_INVREV, &dev->flags)) {
		DEBUGP(4, dev, "T=0 set Procedure byte (inverse-reverse) "
		       "0x%.2x\n", invert_revert(dev->sbuf[1]));
		xoutb(invert_revert(dev->sbuf[1]), REG_NUM_BYTES(iobase));
	} else {
		DEBUGP(4, dev, "T=0 set Procedure byte 0x%.2x\n", dev->sbuf[1]);
		xoutb(dev->sbuf[1], REG_NUM_BYTES(iobase));
	}

	DEBUGP(1, dev, "set NumSendBytes = 0x%.2x\n",
	       (unsigned char)(nsend & 0xff));
	xoutb((unsigned char)(nsend & 0xff), REG_NUM_SEND(iobase));

	DEBUGP(1, dev, "Trigger CARDMAN CONTROLLER (0x%.2x)\n",
	       0x40	/* SM_Active */
	      | (dev->flags0 & 2 ? 0 : 4)	/* power on if needed */
	      |(dev->proto ? 0x10 : 0x08)	/* T=1/T=0 */
	      |(nsend & 0x100) >> 8 /* MSB numSendBytes */ );
	xoutb(0x40		/* SM_Active */
	      | (dev->flags0 & 2 ? 0 : 4)	/* power on if needed */
	      |(dev->proto ? 0x10 : 0x08)	/* T=1/T=0 */
	      |(nsend & 0x100) >> 8,	/* MSB numSendBytes */
	      REG_FLAGS0(iobase));

	/* wait for xmit done */
	if (dev->proto == 1) {
		DEBUGP(4, dev, "Wait for xmit done\n");
		for (i = 0; i < 1000; i++) {
			if (inb(REG_FLAGS0(iobase)) & 0x08)
				break;
			msleep_interruptible(10);
		}
		if (i == 1000) {
			DEBUGP(4, dev, "timeout waiting for xmit done\n");
			rc = -EIO;
			goto release_io;
		}
	}

	/* T=1: wait for infoLen */

	infolen = 0;
	if (dev->proto) {
		/* wait until infoLen is valid */
		for (i = 0; i < 6000; i++) {	/* max waiting time of 1 min */
			io_read_num_rec_bytes(iobase, &s);
			if (s >= 3) {
				infolen = inb(REG_FLAGS1(iobase));
				DEBUGP(4, dev, "infolen=%d\n", infolen);
				break;
			}
			msleep_interruptible(10);
		}
		if (i == 6000) {
			DEBUGP(4, dev, "timeout waiting for infoLen\n");
			rc = -EIO;
			goto release_io;
		}
	} else
		clear_bit(IS_PROCBYTE_PRESENT, &dev->flags);

	/* numRecBytes | bit9 of numRecytes */
	io_read_num_rec_bytes(iobase, &dev->rlen);
	for (i = 0; i < 600; i++) {	/* max waiting time of 2 sec */
		if (dev->proto) {
			if (dev->rlen >= infolen + 4)
				break;
		}
		msleep_interruptible(10);
		/* numRecBytes | bit9 of numRecytes */
		io_read_num_rec_bytes(iobase, &s);
		if (s > dev->rlen) {
			DEBUGP(1, dev, "NumRecBytes inc (reset timeout)\n");
			i = 0;	/* reset timeout */
			dev->rlen = s;
		}
		/* T=0: we are done when numRecBytes doesn't
		 *      increment any more and NoProcedureByte
		 *      is set and numRecBytes == bytes sent + 6
		 *      (header bytes + data + 1 for sw2)
		 *      except when the card replies an error
		 *      which means, no data will be sent back.
		 */
		else if (dev->proto == 0) {
			if ((inb(REG_BUF_ADDR(iobase)) & 0x80)) {
				/* no procedure byte received since last read */
				DEBUGP(1, dev, "NoProcedure byte set\n");
				/* i=0; */
			} else {
				/* procedure byte received since last read */
				DEBUGP(1, dev, "NoProcedure byte unset "
					"(reset timeout)\n");
				dev->procbyte = inb(REG_FLAGS1(iobase));
				DEBUGP(1, dev, "Read procedure byte 0x%.2x\n",
				      dev->procbyte);
				i = 0;	/* resettimeout */
			}
			if (inb(REG_FLAGS0(iobase)) & 0x08) {
				DEBUGP(1, dev, "T0Done flag (read reply)\n");
				break;
			}
		}
		if (dev->proto)
			infolen = inb(REG_FLAGS1(iobase));
	}
	if (i == 600) {
		DEBUGP(1, dev, "timeout waiting for numRecBytes\n");
		rc = -EIO;
		goto release_io;
	} else {
		if (dev->proto == 0) {
			DEBUGP(1, dev, "Wait for T0Done bit to be  set\n");
			for (i = 0; i < 1000; i++) {
				if (inb(REG_FLAGS0(iobase)) & 0x08)
					break;
				msleep_interruptible(10);
			}
			if (i == 1000) {
				DEBUGP(1, dev, "timeout waiting for T0Done\n");
				rc = -EIO;
				goto release_io;
			}

			dev->procbyte = inb(REG_FLAGS1(iobase));
			DEBUGP(4, dev, "Read procedure byte 0x%.2x\n",
			      dev->procbyte);

			io_read_num_rec_bytes(iobase, &dev->rlen);
			DEBUGP(4, dev, "Read NumRecBytes = %i\n", dev->rlen);

		}
	}
	/* T=1: read offset=zero, T=0: read offset=after challenge */
	dev->rpos = dev->proto ? 0 : nr == 4 ? 5 : nr > dev->rlen ? 5 : nr;
	DEBUGP(4, dev, "dev->rlen = %i,  dev->rpos = %i, nr = %i\n",
	      dev->rlen, dev->rpos, nr);

release_io:
	DEBUGP(4, dev, "Reset SM\n");
	xoutb(0x80, REG_FLAGS0(iobase));	/* reset SM */

	if (rc < 0) {
		DEBUGP(4, dev, "Write failed but clear T_Active\n");
		dev->flags1 &= 0xdf;
		xoutb(dev->flags1, REG_FLAGS1(iobase));
	}

	clear_bit(LOCK_IO, &dev->flags);
	wake_up_interruptible(&dev->ioq);
	wake_up_interruptible(&dev->readq);	/* tell read we have data */

	/* ITSEC E2: clear write buffer */
	memset((char *)dev->sbuf, 0, 512);

	/* return error or actually written bytes */
	DEBUGP(2, dev, "<- cmm_write\n");
	return rc < 0 ? rc : nr;
}

static void start_monitor(struct cm4000_dev *dev)
{
	DEBUGP(3, dev, "-> start_monitor\n");
	if (!dev->monitor_running) {
		DEBUGP(5, dev, "create, init and add timer\n");
		setup_timer(&dev->timer, monitor_card, (unsigned long)dev);
		dev->monitor_running = 1;
		mod_timer(&dev->timer, jiffies);
	} else
		DEBUGP(5, dev, "monitor already running\n");
	DEBUGP(3, dev, "<- start_monitor\n");
}

static void stop_monitor(struct cm4000_dev *dev)
{
	DEBUGP(3, dev, "-> stop_monitor\n");
	if (dev->monitor_running) {
		DEBUGP(5, dev, "stopping monitor\n");
		terminate_monitor(dev);
		/* reset monitor SM */
		clear_bit(IS_ATR_VALID, &dev->flags);
		clear_bit(IS_ATR_PRESENT, &dev->flags);
	} else
		DEBUGP(5, dev, "monitor already stopped\n");
	DEBUGP(3, dev, "<- stop_monitor\n");
}

static long cmm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct cm4000_dev *dev = filp->private_data;
	unsigned int iobase = dev->p_dev->resource[0]->start;
	struct inode *inode = file_inode(filp);
	struct pcmcia_device *link;
	int size;
	int rc;
	void __user *argp = (void __user *)arg;
#ifdef CM4000_DEBUG
	char *ioctl_names[CM_IOC_MAXNR + 1] = {
		[_IOC_NR(CM_IOCGSTATUS)] "CM_IOCGSTATUS",
		[_IOC_NR(CM_IOCGATR)] "CM_IOCGATR",
		[_IOC_NR(CM_IOCARDOFF)] "CM_IOCARDOFF",
		[_IOC_NR(CM_IOCSPTS)] "CM_IOCSPTS",
		[_IOC_NR(CM_IOSDBGLVL)] "CM4000_DBGLVL",
	};
	DEBUGP(3, dev, "cmm_ioctl(device=%d.%d) %s\n", imajor(inode),
	       iminor(inode), ioctl_names[_IOC_NR(cmd)]);
#endif

	mutex_lock(&cmm_mutex);
	rc = -ENODEV;
	link = dev_table[iminor(inode)];
	if (!pcmcia_dev_present(link)) {
		DEBUGP(4, dev, "DEV_OK false\n");
		goto out;
	}

	if (test_bit(IS_CMM_ABSENT, &dev->flags)) {
		DEBUGP(4, dev, "CMM_ABSENT flag set\n");
		goto out;
	}
	rc = -EINVAL;

	if (_IOC_TYPE(cmd) != CM_IOC_MAGIC) {
		DEBUGP(4, dev, "ioctype mismatch\n");
		goto out;
	}
	if (_IOC_NR(cmd) > CM_IOC_MAXNR) {
		DEBUGP(4, dev, "iocnr mismatch\n");
		goto out;
	}
	size = _IOC_SIZE(cmd);
	rc = -EFAULT;
	DEBUGP(4, dev, "iocdir=%.4x iocr=%.4x iocw=%.4x iocsize=%d cmd=%.4x\n",
	      _IOC_DIR(cmd), _IOC_READ, _IOC_WRITE, size, cmd);

	if (_IOC_DIR(cmd) & _IOC_READ) {
		if (!access_ok(VERIFY_WRITE, argp, size))
			goto out;
	}
	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		if (!access_ok(VERIFY_READ, argp, size))
			goto out;
	}
	rc = 0;

	switch (cmd) {
	case CM_IOCGSTATUS:
		DEBUGP(4, dev, " ... in CM_IOCGSTATUS\n");
		{
			int status;

			/* clear other bits, but leave inserted & powered as
			 * they are */
			status = dev->flags0 & 3;
			if (test_bit(IS_ATR_PRESENT, &dev->flags))
				status |= CM_ATR_PRESENT;
			if (test_bit(IS_ATR_VALID, &dev->flags))
				status |= CM_ATR_VALID;
			if (test_bit(IS_CMM_ABSENT, &dev->flags))
				status |= CM_NO_READER;
			if (test_bit(IS_BAD_CARD, &dev->flags))
				status |= CM_BAD_CARD;
			if (copy_to_user(argp, &status, sizeof(int)))
				rc = -EFAULT;
		}
		break;
	case CM_IOCGATR:
		DEBUGP(4, dev, "... in CM_IOCGATR\n");
		{
			struct atreq __user *atreq = argp;
			int tmp;
			/* allow nonblocking io and being interrupted */
			if (wait_event_interruptible
			    (dev->atrq,
			     ((filp->f_flags & O_NONBLOCK)
			      || (test_bit(IS_ATR_PRESENT, (void *)&dev->flags)
				  != 0)))) {
				if (filp->f_flags & O_NONBLOCK)
					rc = -EAGAIN;
				else
					rc = -ERESTARTSYS;
				break;
			}

			rc = -EFAULT;
			if (test_bit(IS_ATR_VALID, &dev->flags) == 0) {
				tmp = -1;
				if (copy_to_user(&(atreq->atr_len), &tmp,
						 sizeof(int)))
					break;
			} else {
				if (copy_to_user(atreq->atr, dev->atr,
						 dev->atr_len))
					break;

				tmp = dev->atr_len;
				if (copy_to_user(&(atreq->atr_len), &tmp, sizeof(int)))
					break;
			}
			rc = 0;
			break;
		}
	case CM_IOCARDOFF:

#ifdef CM4000_DEBUG
		DEBUGP(4, dev, "... in CM_IOCARDOFF\n");
		if (dev->flags0 & 0x01) {
			DEBUGP(4, dev, "    Card inserted\n");
		} else {
			DEBUGP(2, dev, "    No card inserted\n");
		}
		if (dev->flags0 & 0x02) {
			DEBUGP(4, dev, "    Card powered\n");
		} else {
			DEBUGP(2, dev, "    Card not powered\n");
		}
#endif

		/* is a card inserted and powered? */
		if ((dev->flags0 & 0x01) && (dev->flags0 & 0x02)) {

			/* get IO lock */
			if (wait_event_interruptible
			    (dev->ioq,
			     ((filp->f_flags & O_NONBLOCK)
			      || (test_and_set_bit(LOCK_IO, (void *)&dev->flags)
				  == 0)))) {
				if (filp->f_flags & O_NONBLOCK)
					rc = -EAGAIN;
				else
					rc = -ERESTARTSYS;
				break;
			}
			/* Set Flags0 = 0x42 */
			DEBUGP(4, dev, "Set Flags0=0x42 \n");
			xoutb(0x42, REG_FLAGS0(iobase));
			clear_bit(IS_ATR_PRESENT, &dev->flags);
			clear_bit(IS_ATR_VALID, &dev->flags);
			dev->mstate = M_CARDOFF;
			clear_bit(LOCK_IO, &dev->flags);
			if (wait_event_interruptible
			    (dev->atrq,
			     ((filp->f_flags & O_NONBLOCK)
			      || (test_bit(IS_ATR_VALID, (void *)&dev->flags) !=
				  0)))) {
				if (filp->f_flags & O_NONBLOCK)
					rc = -EAGAIN;
				else
					rc = -ERESTARTSYS;
				break;
			}
		}
		/* release lock */
		clear_bit(LOCK_IO, &dev->flags);
		wake_up_interruptible(&dev->ioq);

		rc = 0;
		break;
	case CM_IOCSPTS:
		{
			struct ptsreq krnptsreq;

			if (copy_from_user(&krnptsreq, argp,
					   sizeof(struct ptsreq))) {
				rc = -EFAULT;
				break;
			}

			rc = 0;
			DEBUGP(4, dev, "... in CM_IOCSPTS\n");
			/* wait for ATR to get valid */
			if (wait_event_interruptible
			    (dev->atrq,
			     ((filp->f_flags & O_NONBLOCK)
			      || (test_bit(IS_ATR_PRESENT, (void *)&dev->flags)
				  != 0)))) {
				if (filp->f_flags & O_NONBLOCK)
					rc = -EAGAIN;
				else
					rc = -ERESTARTSYS;
				break;
			}
			/* get IO lock */
			if (wait_event_interruptible
			    (dev->ioq,
			     ((filp->f_flags & O_NONBLOCK)
			      || (test_and_set_bit(LOCK_IO, (void *)&dev->flags)
				  == 0)))) {
				if (filp->f_flags & O_NONBLOCK)
					rc = -EAGAIN;
				else
					rc = -ERESTARTSYS;
				break;
			}

			if ((rc = set_protocol(dev, &krnptsreq)) != 0) {
				/* auto power_on again */
				dev->mstate = M_FETCH_ATR;
				clear_bit(IS_ATR_VALID, &dev->flags);
			}
			/* release lock */
			clear_bit(LOCK_IO, &dev->flags);
			wake_up_interruptible(&dev->ioq);

		}
		break;
#ifdef CM4000_DEBUG
	case CM_IOSDBGLVL:
		rc = -ENOTTY;
		break;
#endif
	default:
		DEBUGP(4, dev, "... in default (unknown IOCTL code)\n");
		rc = -ENOTTY;
	}
out:
	mutex_unlock(&cmm_mutex);
	return rc;
}

static int cmm_open(struct inode *inode, struct file *filp)
{
	struct cm4000_dev *dev;
	struct pcmcia_device *link;
	int minor = iminor(inode);
	int ret;

	if (minor >= CM4000_MAX_DEV)
		return -ENODEV;

	mutex_lock(&cmm_mutex);
	link = dev_table[minor];
	if (link == NULL || !pcmcia_dev_present(link)) {
		ret = -ENODEV;
		goto out;
	}

	if (link->open) {
		ret = -EBUSY;
		goto out;
	}

	dev = link->priv;
	filp->private_data = dev;

	DEBUGP(2, dev, "-> cmm_open(device=%d.%d process=%s,%d)\n",
	      imajor(inode), minor, current->comm, current->pid);

	/* init device variables, they may be "polluted" after close
	 * or, the device may never have been closed (i.e. open failed)
	 */

	ZERO_DEV(dev);

	/* opening will always block since the
	 * monitor will be started by open, which
	 * means we have to wait for ATR becoming
	 * valid = block until valid (or card
	 * inserted)
	 */
	if (filp->f_flags & O_NONBLOCK) {
		ret = -EAGAIN;
		goto out;
	}

	dev->mdelay = T_50MSEC;

	/* start monitoring the cardstatus */
	start_monitor(dev);

	link->open = 1;		/* only one open per device */

	DEBUGP(2, dev, "<- cmm_open\n");
	ret = nonseekable_open(inode, filp);
out:
	mutex_unlock(&cmm_mutex);
	return ret;
}

static int cmm_close(struct inode *inode, struct file *filp)
{
	struct cm4000_dev *dev;
	struct pcmcia_device *link;
	int minor = iminor(inode);

	if (minor >= CM4000_MAX_DEV)
		return -ENODEV;

	link = dev_table[minor];
	if (link == NULL)
		return -ENODEV;

	dev = link->priv;

	DEBUGP(2, dev, "-> cmm_close(maj/min=%d.%d)\n",
	       imajor(inode), minor);

	stop_monitor(dev);

	ZERO_DEV(dev);

	link->open = 0;		/* only one open per device */
	wake_up(&dev->devq);	/* socket removed? */

	DEBUGP(2, dev, "cmm_close\n");
	return 0;
}

static void cmm_cm4000_release(struct pcmcia_device * link)
{
	struct cm4000_dev *dev = link->priv;

	/* dont terminate the monitor, rather rely on
	 * close doing that for us.
	 */
	DEBUGP(3, dev, "-> cmm_cm4000_release\n");
	while (link->open) {
		printk(KERN_INFO MODULE_NAME ": delaying release until "
		       "process has terminated\n");
		/* note: don't interrupt us:
		 * close the applications which own
		 * the devices _first_ !
		 */
		wait_event(dev->devq, (link->open == 0));
	}
	/* dev->devq=NULL;	this cannot be zeroed earlier */
	DEBUGP(3, dev, "<- cmm_cm4000_release\n");
	return;
}

/*==== Interface to PCMCIA Layer =======================================*/

static int cm4000_config_check(struct pcmcia_device *p_dev, void *priv_data)
{
	return pcmcia_request_io(p_dev);
}

static int cm4000_config(struct pcmcia_device * link, int devno)
{
	struct cm4000_dev *dev;

	link->config_flags |= CONF_AUTO_SET_IO;

	/* read the config-tuples */
	if (pcmcia_loop_config(link, cm4000_config_check, NULL))
		goto cs_release;

	if (pcmcia_enable_device(link))
		goto cs_release;

	dev = link->priv;

	return 0;

cs_release:
	cm4000_release(link);
	return -ENODEV;
}

static int cm4000_suspend(struct pcmcia_device *link)
{
	struct cm4000_dev *dev;

	dev = link->priv;
	stop_monitor(dev);

	return 0;
}

static int cm4000_resume(struct pcmcia_device *link)
{
	struct cm4000_dev *dev;

	dev = link->priv;
	if (link->open)
		start_monitor(dev);

	return 0;
}

static void cm4000_release(struct pcmcia_device *link)
{
	cmm_cm4000_release(link);	/* delay release until device closed */
	pcmcia_disable_device(link);
}

static int cm4000_probe(struct pcmcia_device *link)
{
	struct cm4000_dev *dev;
	int i, ret;

	for (i = 0; i < CM4000_MAX_DEV; i++)
		if (dev_table[i] == NULL)
			break;

	if (i == CM4000_MAX_DEV) {
		printk(KERN_NOTICE MODULE_NAME ": all devices in use\n");
		return -ENODEV;
	}

	/* create a new cm4000_cs device */
	dev = kzalloc(sizeof(struct cm4000_dev), GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;

	dev->p_dev = link;
	link->priv = dev;
	dev_table[i] = link;

	init_waitqueue_head(&dev->devq);
	init_waitqueue_head(&dev->ioq);
	init_waitqueue_head(&dev->atrq);
	init_waitqueue_head(&dev->readq);

	ret = cm4000_config(link, i);
	if (ret) {
		dev_table[i] = NULL;
		kfree(dev);
		return ret;
	}

	device_create(cmm_class, NULL, MKDEV(major, i), NULL, "cmm%d", i);

	return 0;
}

static void cm4000_detach(struct pcmcia_device *link)
{
	struct cm4000_dev *dev = link->priv;
	int devno;

	/* find device */
	for (devno = 0; devno < CM4000_MAX_DEV; devno++)
		if (dev_table[devno] == link)
			break;
	if (devno == CM4000_MAX_DEV)
		return;

	stop_monitor(dev);

	cm4000_release(link);

	dev_table[devno] = NULL;
	kfree(dev);

	device_destroy(cmm_class, MKDEV(major, devno));

	return;
}

static const struct file_operations cm4000_fops = {
	.owner	= THIS_MODULE,
	.read	= cmm_read,
	.write	= cmm_write,
	.unlocked_ioctl	= cmm_ioctl,
	.open	= cmm_open,
	.release= cmm_close,
	.llseek = no_llseek,
};

static const struct pcmcia_device_id cm4000_ids[] = {
	PCMCIA_DEVICE_MANF_CARD(0x0223, 0x0002),
	PCMCIA_DEVICE_PROD_ID12("CardMan", "4000", 0x2FB368CA, 0xA2BD8C39),
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, cm4000_ids);

static struct pcmcia_driver cm4000_driver = {
	.owner	  = THIS_MODULE,
	.name	  = "cm4000_cs",
	.probe    = cm4000_probe,
	.remove   = cm4000_detach,
	.suspend  = cm4000_suspend,
	.resume   = cm4000_resume,
	.id_table = cm4000_ids,
};

static int __init cmm_init(void)
{
	int rc;

	cmm_class = class_create(THIS_MODULE, "cardman_4000");
	if (IS_ERR(cmm_class))
		return PTR_ERR(cmm_class);

	major = register_chrdev(0, DEVICE_NAME, &cm4000_fops);
	if (major < 0) {
		printk(KERN_WARNING MODULE_NAME
			": could not get major number\n");
		class_destroy(cmm_class);
		return major;
	}

	rc = pcmcia_register_driver(&cm4000_driver);
	if (rc < 0) {
		unregister_chrdev(major, DEVICE_NAME);
		class_destroy(cmm_class);
		return rc;
	}

	return 0;
}

static void __exit cmm_exit(void)
{
	pcmcia_unregister_driver(&cm4000_driver);
	unregister_chrdev(major, DEVICE_NAME);
	class_destroy(cmm_class);
};

module_init(cmm_init);
module_exit(cmm_exit);
MODULE_LICENSE("Dual BSD/GPL");