aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/pcmcia/cm4000_cs.c
blob: c7b482d15e2adb0416785fc837cc9c18b9884667 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
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
 /*
  * 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 CodingStyle
  * 	- 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/smp_lock.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)

#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 CodingStyle.  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 explictely 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 doesnt 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 = 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;
		}
		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 = filp->f_path.dentry->d_inode;
	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

	lock_kernel();
	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:
	unlock_kernel();
	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;

	lock_kernel();
	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
	 * vaild = 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:
	unlock_kernel();
	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,
};

static 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");