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
/*
 * cb_pcidas.c
 * Developed by Ivan Martinez and Frank Mori Hess, with valuable help from
 * David Schleef and the rest of the Comedi developers comunity.
 *
 * Copyright (C) 2001-2003 Ivan Martinez <imr@oersted.dtu.dk>
 * Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

/*
 * Driver: cb_pcidas
 * Description: MeasurementComputing PCI-DAS series
 *   with the AMCC S5933 PCI controller
 * Devices: [Measurement Computing] PCI-DAS1602/16 (cb_pcidas),
 *   PCI-DAS1602/16jr, PCI-DAS1602/12, PCI-DAS1200, PCI-DAS1200jr,
 *   PCI-DAS1000, PCI-DAS1001, PCI_DAS1002
 * Author: Ivan Martinez <imr@oersted.dtu.dk>,
 *   Frank Mori Hess <fmhess@users.sourceforge.net>
 * Updated: 2003-3-11
 *
 * Status:
 * There are many reports of the driver being used with most of the
 * supported cards. Despite no detailed log is maintained, it can
 * be said that the driver is quite tested and stable.
 *
 * The boards may be autocalibrated using the comedi_calibrate
 * utility.
 *
 * Configuration options: not applicable, uses PCI auto config
 *
 * For commands, the scanned channels must be consecutive
 * (i.e. 4-5-6-7, 2-3-4,...), and must all have the same
 * range and aref.
 *
 * AI Triggering:
 * For start_src == TRIG_EXT, the A/D EXTERNAL TRIGGER IN (pin 45) is used.
 * For 1602 series, the start_arg is interpreted as follows:
 *	start_arg == 0                   => gated trigger (level high)
 *	start_arg == CR_INVERT           => gated trigger (level low)
 *	start_arg == CR_EDGE             => Rising edge
 *	start_arg == CR_EDGE | CR_INVERT => Falling edge
 * For the other boards the trigger will be done on rising edge
 */

/*
 * TODO:
 * analog triggering on 1602 series
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include "../comedi_pci.h"

#include "comedi_8254.h"
#include "8255.h"
#include "amcc_s5933.h"

#define AI_BUFFER_SIZE		1024	/* max ai fifo size */
#define AO_BUFFER_SIZE		1024	/* max ao fifo size */

/*
 * PCI BAR1 Register map (devpriv->pcibar1)
 */
#define PCIDAS_CTRL_REG		0x00	/* INTERRUPT / ADC FIFO register */
#define PCIDAS_CTRL_INT(x)	(((x) & 0x3) << 0)
#define PCIDAS_CTRL_INT_NONE	PCIDAS_CTRL_INT(0) /* no int selected */
#define PCIDAS_CTRL_INT_EOS	PCIDAS_CTRL_INT(1) /* int on end of scan */
#define PCIDAS_CTRL_INT_FHF	PCIDAS_CTRL_INT(2) /* int on fifo half full */
#define PCIDAS_CTRL_INT_FNE	PCIDAS_CTRL_INT(3) /* int on fifo not empty */
#define PCIDAS_CTRL_INT_MASK	PCIDAS_CTRL_INT(3) /* mask of int select bits */
#define PCIDAS_CTRL_INTE	BIT(2)	/* int enable */
#define PCIDAS_CTRL_DAHFIE	BIT(3)	/* dac half full int enable */
#define PCIDAS_CTRL_EOAIE	BIT(4)	/* end of acq. int enable */
#define PCIDAS_CTRL_DAHFI	BIT(5)	/* dac half full status / clear */
#define PCIDAS_CTRL_EOAI	BIT(6)	/* end of acq. int status / clear */
#define PCIDAS_CTRL_INT_CLR	BIT(7)	/* int status / clear */
#define PCIDAS_CTRL_EOBI	BIT(9)	/* end of burst int status */
#define PCIDAS_CTRL_ADHFI	BIT(10)	/* half-full int status */
#define PCIDAS_CTRL_ADNEI	BIT(11)	/* fifo not empty int status (latch) */
#define PCIDAS_CTRL_ADNE	BIT(12)	/* fifo not empty status (realtime) */
#define PCIDAS_CTRL_DAEMIE	BIT(12)	/* dac empty int enable */
#define PCIDAS_CTRL_LADFUL	BIT(13)	/* fifo overflow / clear */
#define PCIDAS_CTRL_DAEMI	BIT(14)	/* dac fifo empty int status / clear */

#define PCIDAS_CTRL_AI_INT	(PCIDAS_CTRL_EOAI | PCIDAS_CTRL_EOBI |   \
				 PCIDAS_CTRL_ADHFI | PCIDAS_CTRL_ADNEI | \
				 PCIDAS_CTRL_LADFUL)
#define PCIDAS_CTRL_AO_INT	(PCIDAS_CTRL_DAHFI | PCIDAS_CTRL_DAEMI)

#define PCIDAS_AI_REG		0x02	/* ADC CHANNEL MUX AND CONTROL reg */
#define PCIDAS_AI_FIRST(x)	((x) & 0xf)
#define PCIDAS_AI_LAST(x)	(((x) & 0xf) << 4)
#define PCIDAS_AI_CHAN(x)	(PCIDAS_AI_FIRST(x) | PCIDAS_AI_LAST(x))
#define PCIDAS_AI_GAIN(x)	(((x) & 0x3) << 8)
#define PCIDAS_AI_SE		BIT(10)	/* Inputs in single-ended mode */
#define PCIDAS_AI_UNIP		BIT(11)	/* Analog front-end unipolar mode */
#define PCIDAS_AI_PACER(x)	(((x) & 0x3) << 12)
#define PCIDAS_AI_PACER_SW	PCIDAS_AI_PACER(0) /* software pacer */
#define PCIDAS_AI_PACER_INT	PCIDAS_AI_PACER(1) /* int. pacer */
#define PCIDAS_AI_PACER_EXTN	PCIDAS_AI_PACER(2) /* ext. falling edge */
#define PCIDAS_AI_PACER_EXTP	PCIDAS_AI_PACER(3) /* ext. rising edge */
#define PCIDAS_AI_PACER_MASK	PCIDAS_AI_PACER(3) /* pacer source bits */
#define PCIDAS_AI_EOC		BIT(14)	/* adc not busy */

#define PCIDAS_TRIG_REG		0x04	/* TRIGGER CONTROL/STATUS register */
#define PCIDAS_TRIG_SEL(x)	(((x) & 0x3) << 0)
#define PCIDAS_TRIG_SEL_NONE	PCIDAS_TRIG_SEL(0) /* no start trigger */
#define PCIDAS_TRIG_SEL_SW	PCIDAS_TRIG_SEL(1) /* software start trigger */
#define PCIDAS_TRIG_SEL_EXT	PCIDAS_TRIG_SEL(2) /* ext. start trigger */
#define PCIDAS_TRIG_SEL_ANALOG	PCIDAS_TRIG_SEL(3) /* ext. analog trigger */
#define PCIDAS_TRIG_SEL_MASK	PCIDAS_TRIG_SEL(3) /* start trigger mask */
#define PCIDAS_TRIG_POL		BIT(2)	/* invert trigger (1602 only) */
#define PCIDAS_TRIG_MODE	BIT(3)	/* edge/level trigerred (1602 only) */
#define PCIDAS_TRIG_EN		BIT(4)	/* enable external start trigger */
#define PCIDAS_TRIG_BURSTE	BIT(5)	/* burst mode enable */
#define PCIDAS_TRIG_CLR		BIT(7)	/* clear external trigger */

#define PCIDAS_CALIB_REG	0x06	/* CALIBRATION register */
#define PCIDAS_CALIB_8800_SEL	BIT(8)	/* select 8800 caldac */
#define PCIDAS_CALIB_TRIM_SEL	BIT(9)	/* select ad7376 trim pot */
#define PCIDAS_CALIB_DAC08_SEL	BIT(10)	/* select dac08 caldac */
#define PCIDAS_CALIB_SRC(x)	(((x) & 0x7) << 11)
#define PCIDAS_CALIB_EN		BIT(14)	/* calibration source enable */
#define PCIDAS_CALIB_DATA	BIT(15)	/* serial data bit going to caldac */

#define PCIDAS_AO_REG		0x08	/* dac control and status register */
#define PCIDAS_AO_EMPTY		BIT(0)	/* fifo empty, write clear (1602) */
#define PCIDAS_AO_DACEN		BIT(1)	/* dac enable */
#define PCIDAS_AO_START		BIT(2)	/* start/arm fifo (1602) */
#define PCIDAS_AO_PACER(x)	(((x) & 0x3) << 3) /* (1602) */
#define PCIDAS_AO_PACER_SW	PCIDAS_AO_PACER(0) /* software pacer */
#define PCIDAS_AO_PACER_INT	PCIDAS_AO_PACER(1) /* int. pacer */
#define PCIDAS_AO_PACER_EXTN	PCIDAS_AO_PACER(2) /* ext. falling edge */
#define PCIDAS_AO_PACER_EXTP	PCIDAS_AO_PACER(3) /* ext. rising edge */
#define PCIDAS_AO_PACER_MASK	PCIDAS_AO_PACER(3) /* pacer source bits */
#define PCIDAS_AO_CHAN_EN(c)	BIT(5 + ((c) & 0x1))
#define PCIDAS_AO_CHAN_MASK	(PCIDAS_AO_CHAN_EN(0) | PCIDAS_AO_CHAN_EN(1))
#define PCIDAS_AO_UPDATE_BOTH	BIT(7)	/* update both dacs */
#define PCIDAS_AO_RANGE(c, r)	(((r) & 0x3) << (8 + 2 * ((c) & 0x1)))
#define PCIDAS_AO_RANGE_MASK(c)	PCIDAS_AO_RANGE((c), 0x3)

/*
 * PCI BAR2 Register map (devpriv->pcibar2)
 */
#define PCIDAS_AI_DATA_REG	0x00
#define PCIDAS_AI_FIFO_CLR_REG	0x02

/*
 * PCI BAR3 Register map (dev->iobase)
 */
#define PCIDAS_AI_8254_BASE	0x00
#define PCIDAS_8255_BASE	0x04
#define PCIDAS_AO_8254_BASE	0x08

/*
 * PCI BAR4 Register map (devpriv->pcibar4)
 */
#define PCIDAS_AO_DATA_REG(x)	(0x00 + ((x) * 2))
#define PCIDAS_AO_FIFO_REG	0x00
#define PCIDAS_AO_FIFO_CLR_REG	0x02

/* analog input ranges for most boards */
static const struct comedi_lrange cb_pcidas_ranges = {
	8, {
		BIP_RANGE(10),
		BIP_RANGE(5),
		BIP_RANGE(2.5),
		BIP_RANGE(1.25),
		UNI_RANGE(10),
		UNI_RANGE(5),
		UNI_RANGE(2.5),
		UNI_RANGE(1.25)
	}
};

/* pci-das1001 input ranges */
static const struct comedi_lrange cb_pcidas_alt_ranges = {
	8, {
		BIP_RANGE(10),
		BIP_RANGE(1),
		BIP_RANGE(0.1),
		BIP_RANGE(0.01),
		UNI_RANGE(10),
		UNI_RANGE(1),
		UNI_RANGE(0.1),
		UNI_RANGE(0.01)
	}
};

/* analog output ranges */
static const struct comedi_lrange cb_pcidas_ao_ranges = {
	4, {
		BIP_RANGE(5),
		BIP_RANGE(10),
		UNI_RANGE(5),
		UNI_RANGE(10)
	}
};

enum cb_pcidas_boardid {
	BOARD_PCIDAS1602_16,
	BOARD_PCIDAS1200,
	BOARD_PCIDAS1602_12,
	BOARD_PCIDAS1200_JR,
	BOARD_PCIDAS1602_16_JR,
	BOARD_PCIDAS1000,
	BOARD_PCIDAS1001,
	BOARD_PCIDAS1002,
};

struct cb_pcidas_board {
	const char *name;
	int ai_speed;		/*  fastest conversion period in ns */
	int ao_scan_speed;	/*  analog output scan speed for 1602 series */
	int fifo_size;		/*  number of samples fifo can hold */
	unsigned int is_16bit;		/* ai/ao is 1=16-bit; 0=12-bit */
	unsigned int use_alt_range:1;	/* use alternate ai range table */
	unsigned int has_ao:1;		/* has 2 analog output channels */
	unsigned int has_ao_fifo:1;	/* analog output has fifo */
	unsigned int has_ad8402:1;	/* trimpot type 1=AD8402; 0=AD7376 */
	unsigned int has_dac08:1;
	unsigned int is_1602:1;
};

static const struct cb_pcidas_board cb_pcidas_boards[] = {
	[BOARD_PCIDAS1602_16] = {
		.name		= "pci-das1602/16",
		.ai_speed	= 5000,
		.ao_scan_speed	= 10000,
		.fifo_size	= 512,
		.is_16bit	= 1,
		.has_ao		= 1,
		.has_ao_fifo	= 1,
		.has_ad8402	= 1,
		.has_dac08	= 1,
		.is_1602	= 1,
	},
	[BOARD_PCIDAS1200] = {
		.name		= "pci-das1200",
		.ai_speed	= 3200,
		.fifo_size	= 1024,
		.has_ao		= 1,
	},
	[BOARD_PCIDAS1602_12] = {
		.name		= "pci-das1602/12",
		.ai_speed	= 3200,
		.ao_scan_speed	= 4000,
		.fifo_size	= 1024,
		.has_ao		= 1,
		.has_ao_fifo	= 1,
		.is_1602	= 1,
	},
	[BOARD_PCIDAS1200_JR] = {
		.name		= "pci-das1200/jr",
		.ai_speed	= 3200,
		.fifo_size	= 1024,
	},
	[BOARD_PCIDAS1602_16_JR] = {
		.name		= "pci-das1602/16/jr",
		.ai_speed	= 5000,
		.fifo_size	= 512,
		.is_16bit	= 1,
		.has_ad8402	= 1,
		.has_dac08	= 1,
		.is_1602	= 1,
	},
	[BOARD_PCIDAS1000] = {
		.name		= "pci-das1000",
		.ai_speed	= 4000,
		.fifo_size	= 1024,
	},
	[BOARD_PCIDAS1001] = {
		.name		= "pci-das1001",
		.ai_speed	= 6800,
		.fifo_size	= 1024,
		.use_alt_range	= 1,
		.has_ao		= 1,
	},
	[BOARD_PCIDAS1002] = {
		.name		= "pci-das1002",
		.ai_speed	= 6800,
		.fifo_size	= 1024,
		.has_ao		= 1,
	},
};

struct cb_pcidas_private {
	struct comedi_8254 *ao_pacer;
	/* base addresses */
	unsigned long amcc;	/* pcibar0 */
	unsigned long pcibar1;
	unsigned long pcibar2;
	unsigned long pcibar4;
	/* bits to write to registers */
	unsigned int ctrl;
	unsigned int amcc_intcsr;
	unsigned int ao_ctrl;
	/* fifo buffers */
	unsigned short ai_buffer[AI_BUFFER_SIZE];
	unsigned short ao_buffer[AO_BUFFER_SIZE];
	unsigned int calib_src;
};

static int cb_pcidas_ai_eoc(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn,
			    unsigned long context)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int status;

	status = inw(devpriv->pcibar1 + PCIDAS_AI_REG);
	if (status & PCIDAS_AI_EOC)
		return 0;
	return -EBUSY;
}

static int cb_pcidas_ai_insn_read(struct comedi_device *dev,
				  struct comedi_subdevice *s,
				  struct comedi_insn *insn,
				  unsigned int *data)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	unsigned int aref = CR_AREF(insn->chanspec);
	unsigned int bits;
	int ret;
	int n;

	/* enable calibration input if appropriate */
	if (insn->chanspec & CR_ALT_SOURCE) {
		outw(PCIDAS_CALIB_EN | PCIDAS_CALIB_SRC(devpriv->calib_src),
		     devpriv->pcibar1 + PCIDAS_CALIB_REG);
		chan = 0;
	} else {
		outw(0, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	}

	/* set mux limits and gain */
	bits = PCIDAS_AI_CHAN(chan) | PCIDAS_AI_GAIN(range);
	/* set unipolar/bipolar */
	if (comedi_range_is_unipolar(s, range))
		bits |= PCIDAS_AI_UNIP;
	/* set single-ended/differential */
	if (aref != AREF_DIFF)
		bits |= PCIDAS_AI_SE;
	outw(bits, devpriv->pcibar1 + PCIDAS_AI_REG);

	/* clear fifo */
	outw(0, devpriv->pcibar2 + PCIDAS_AI_FIFO_CLR_REG);

	/* convert n samples */
	for (n = 0; n < insn->n; n++) {
		/* trigger conversion */
		outw(0, devpriv->pcibar2 + PCIDAS_AI_DATA_REG);

		/* wait for conversion to end */
		ret = comedi_timeout(dev, s, insn, cb_pcidas_ai_eoc, 0);
		if (ret)
			return ret;

		/* read data */
		data[n] = inw(devpriv->pcibar2 + PCIDAS_AI_DATA_REG);
	}

	/* return the number of samples read/written */
	return n;
}

static int cb_pcidas_ai_insn_config(struct comedi_device *dev,
				    struct comedi_subdevice *s,
				    struct comedi_insn *insn,
				    unsigned int *data)
{
	struct cb_pcidas_private *devpriv = dev->private;
	int id = data[0];
	unsigned int source = data[1];

	switch (id) {
	case INSN_CONFIG_ALT_SOURCE:
		if (source >= 8) {
			dev_err(dev->class_dev,
				"invalid calibration source: %i\n",
				source);
			return -EINVAL;
		}
		devpriv->calib_src = source;
		break;
	default:
		return -EINVAL;
	}
	return insn->n;
}

/* analog output insn for pcidas-1000 and 1200 series */
static int cb_pcidas_ao_nofifo_insn_write(struct comedi_device *dev,
					  struct comedi_subdevice *s,
					  struct comedi_insn *insn,
					  unsigned int *data)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	unsigned int val = s->readback[chan];
	unsigned long flags;
	int i;

	/* set channel and range */
	spin_lock_irqsave(&dev->spinlock, flags);
	devpriv->ao_ctrl &= ~(PCIDAS_AO_UPDATE_BOTH |
			      PCIDAS_AO_RANGE_MASK(chan));
	devpriv->ao_ctrl |= PCIDAS_AO_DACEN | PCIDAS_AO_RANGE(chan, range);
	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	for (i = 0; i < insn->n; i++) {
		val = data[i];
		outw(val, devpriv->pcibar4 + PCIDAS_AO_DATA_REG(chan));
	}

	s->readback[chan] = val;

	return insn->n;
}

/* analog output insn for pcidas-1602 series */
static int cb_pcidas_ao_fifo_insn_write(struct comedi_device *dev,
					struct comedi_subdevice *s,
					struct comedi_insn *insn,
					unsigned int *data)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	unsigned int val = s->readback[chan];
	unsigned long flags;
	int i;

	/* clear dac fifo */
	outw(0, devpriv->pcibar4 + PCIDAS_AO_FIFO_CLR_REG);

	/* set channel and range */
	spin_lock_irqsave(&dev->spinlock, flags);
	devpriv->ao_ctrl &= ~(PCIDAS_AO_CHAN_MASK | PCIDAS_AO_RANGE_MASK(chan) |
			      PCIDAS_AO_PACER_MASK);
	devpriv->ao_ctrl |= PCIDAS_AO_DACEN | PCIDAS_AO_RANGE(chan, range) |
			    PCIDAS_AO_CHAN_EN(chan) | PCIDAS_AO_START;
	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	for (i = 0; i < insn->n; i++) {
		val = data[i];
		outw(val, devpriv->pcibar4 + PCIDAS_AO_FIFO_REG);
	}

	s->readback[chan] = val;

	return insn->n;
}

static int cb_pcidas_eeprom_ready(struct comedi_device *dev,
				  struct comedi_subdevice *s,
				  struct comedi_insn *insn,
				  unsigned long context)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int status;

	status = inb(devpriv->amcc + AMCC_OP_REG_MCSR_NVCMD);
	if ((status & MCSR_NV_BUSY) == 0)
		return 0;
	return -EBUSY;
}

static int cb_pcidas_eeprom_insn_read(struct comedi_device *dev,
				      struct comedi_subdevice *s,
				      struct comedi_insn *insn,
				      unsigned int *data)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	int ret;
	int i;

	for (i = 0; i < insn->n; i++) {
		/* make sure eeprom is ready */
		ret = comedi_timeout(dev, s, insn, cb_pcidas_eeprom_ready, 0);
		if (ret)
			return ret;

		/* set address (chan) and read operation */
		outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_LOW_ADDR,
		     devpriv->amcc + AMCC_OP_REG_MCSR_NVCMD);
		outb(chan & 0xff, devpriv->amcc + AMCC_OP_REG_MCSR_NVDATA);
		outb(MCSR_NV_ENABLE | MCSR_NV_LOAD_HIGH_ADDR,
		     devpriv->amcc + AMCC_OP_REG_MCSR_NVCMD);
		outb((chan >> 8) & 0xff,
		     devpriv->amcc + AMCC_OP_REG_MCSR_NVDATA);
		outb(MCSR_NV_ENABLE | MCSR_NV_READ,
		     devpriv->amcc + AMCC_OP_REG_MCSR_NVCMD);

		/* wait for data to be returned */
		ret = comedi_timeout(dev, s, insn, cb_pcidas_eeprom_ready, 0);
		if (ret)
			return ret;

		data[i] = inb(devpriv->amcc + AMCC_OP_REG_MCSR_NVDATA);
	}

	return insn->n;
}

static void cb_pcidas_calib_write(struct comedi_device *dev,
				  unsigned int val, unsigned int len,
				  bool trimpot)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int calib_bits;
	unsigned int bit;

	calib_bits = PCIDAS_CALIB_EN | PCIDAS_CALIB_SRC(devpriv->calib_src);
	if (trimpot) {
		/* select trimpot */
		calib_bits |= PCIDAS_CALIB_TRIM_SEL;
		outw(calib_bits, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	}

	/* write bitstream to calibration device */
	for (bit = 1 << (len - 1); bit; bit >>= 1) {
		if (val & bit)
			calib_bits |= PCIDAS_CALIB_DATA;
		else
			calib_bits &= ~PCIDAS_CALIB_DATA;
		udelay(1);
		outw(calib_bits, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	}
	udelay(1);

	calib_bits = PCIDAS_CALIB_EN | PCIDAS_CALIB_SRC(devpriv->calib_src);

	if (!trimpot) {
		/* select caldac */
		outw(calib_bits | PCIDAS_CALIB_8800_SEL,
		     devpriv->pcibar1 + PCIDAS_CALIB_REG);
		udelay(1);
	}

	/* latch value to trimpot/caldac */
	outw(calib_bits, devpriv->pcibar1 + PCIDAS_CALIB_REG);
}

static int cb_pcidas_caldac_insn_write(struct comedi_device *dev,
				       struct comedi_subdevice *s,
				       struct comedi_insn *insn,
				       unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);

	if (insn->n) {
		unsigned int val = data[insn->n - 1];

		if (s->readback[chan] != val) {
			/* write 11-bit channel/value to caldac */
			cb_pcidas_calib_write(dev, (chan << 8) | val, 11,
					      false);
			s->readback[chan] = val;
		}
	}

	return insn->n;
}

static void cb_pcidas_dac08_write(struct comedi_device *dev, unsigned int val)
{
	struct cb_pcidas_private *devpriv = dev->private;

	val |= PCIDAS_CALIB_EN | PCIDAS_CALIB_SRC(devpriv->calib_src);

	/* latch the new value into the caldac */
	outw(val, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	udelay(1);
	outw(val | PCIDAS_CALIB_DAC08_SEL,
	     devpriv->pcibar1 + PCIDAS_CALIB_REG);
	udelay(1);
	outw(val, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	udelay(1);
}

static int cb_pcidas_dac08_insn_write(struct comedi_device *dev,
				      struct comedi_subdevice *s,
				      struct comedi_insn *insn,
				      unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);

	if (insn->n) {
		unsigned int val = data[insn->n - 1];

		if (s->readback[chan] != val) {
			cb_pcidas_dac08_write(dev, val);
			s->readback[chan] = val;
		}
	}

	return insn->n;
}

static void cb_pcidas_trimpot_write(struct comedi_device *dev,
				    unsigned int chan, unsigned int val)
{
	const struct cb_pcidas_board *board = dev->board_ptr;

	if (board->has_ad8402) {
		/* write 10-bit channel/value to AD8402 trimpot */
		cb_pcidas_calib_write(dev, (chan << 8) | val, 10, true);
	} else {
		/* write 7-bit value to AD7376 trimpot */
		cb_pcidas_calib_write(dev, val, 7, true);
	}
}

static int cb_pcidas_trimpot_insn_write(struct comedi_device *dev,
					struct comedi_subdevice *s,
					struct comedi_insn *insn,
					unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);

	if (insn->n) {
		unsigned int val = data[insn->n - 1];

		if (s->readback[chan] != val) {
			cb_pcidas_trimpot_write(dev, chan, val);
			s->readback[chan] = val;
		}
	}

	return insn->n;
}

static int cb_pcidas_ai_check_chanlist(struct comedi_device *dev,
				       struct comedi_subdevice *s,
				       struct comedi_cmd *cmd)
{
	unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
	unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
	int i;

	for (i = 1; i < cmd->chanlist_len; i++) {
		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
		unsigned int range = CR_RANGE(cmd->chanlist[i]);

		if (chan != (chan0 + i) % s->n_chan) {
			dev_dbg(dev->class_dev,
				"entries in chanlist must be consecutive channels, counting upwards\n");
			return -EINVAL;
		}

		if (range != range0) {
			dev_dbg(dev->class_dev,
				"entries in chanlist must all have the same gain\n");
			return -EINVAL;
		}
	}
	return 0;
}

static int cb_pcidas_ai_cmdtest(struct comedi_device *dev,
				struct comedi_subdevice *s,
				struct comedi_cmd *cmd)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	int err = 0;
	unsigned int arg;

	/* Step 1 : check if triggers are trivially valid */

	err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
	err |= comedi_check_trigger_src(&cmd->scan_begin_src,
					TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
	err |= comedi_check_trigger_src(&cmd->convert_src,
					TRIG_TIMER | TRIG_NOW | TRIG_EXT);
	err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
	err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);

	if (err)
		return 1;

	/* Step 2a : make sure trigger sources are unique */

	err |= comedi_check_trigger_is_unique(cmd->start_src);
	err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
	err |= comedi_check_trigger_is_unique(cmd->convert_src);
	err |= comedi_check_trigger_is_unique(cmd->stop_src);

	/* Step 2b : and mutually compatible */

	if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
		err |= -EINVAL;
	if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
		err |= -EINVAL;
	if (cmd->start_src == TRIG_EXT &&
	    (cmd->convert_src == TRIG_EXT || cmd->scan_begin_src == TRIG_EXT))
		err |= -EINVAL;

	if (err)
		return 2;

	/* Step 3: check if arguments are trivially valid */

	switch (cmd->start_src) {
	case TRIG_NOW:
		err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
		break;
	case TRIG_EXT:
		/* External trigger, only CR_EDGE and CR_INVERT flags allowed */
		if ((cmd->start_arg
		     & (CR_FLAGS_MASK & ~(CR_EDGE | CR_INVERT))) != 0) {
			cmd->start_arg &= ~(CR_FLAGS_MASK &
						~(CR_EDGE | CR_INVERT));
			err |= -EINVAL;
		}
		if (!board->is_1602 && (cmd->start_arg & CR_INVERT)) {
			cmd->start_arg &= (CR_FLAGS_MASK & ~CR_INVERT);
			err |= -EINVAL;
		}
		break;
	}

	if (cmd->scan_begin_src == TRIG_TIMER) {
		err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
						    board->ai_speed *
						    cmd->chanlist_len);
	}

	if (cmd->convert_src == TRIG_TIMER) {
		err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
						    board->ai_speed);
	}

	err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
					   cmd->chanlist_len);

	if (cmd->stop_src == TRIG_COUNT)
		err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
	else	/* TRIG_NONE */
		err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);

	if (err)
		return 3;

	/* step 4: fix up any arguments */

	if (cmd->scan_begin_src == TRIG_TIMER) {
		arg = cmd->scan_begin_arg;
		comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
		err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
	}
	if (cmd->convert_src == TRIG_TIMER) {
		arg = cmd->convert_arg;
		comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
		err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
	}

	if (err)
		return 4;

	/* Step 5: check channel list if it exists */
	if (cmd->chanlist && cmd->chanlist_len > 0)
		err |= cb_pcidas_ai_check_chanlist(dev, s, cmd);

	if (err)
		return 5;

	return 0;
}

static int cb_pcidas_ai_cmd(struct comedi_device *dev,
			    struct comedi_subdevice *s)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	struct cb_pcidas_private *devpriv = dev->private;
	struct comedi_async *async = s->async;
	struct comedi_cmd *cmd = &async->cmd;
	unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
	unsigned int bits;
	unsigned long flags;

	/*  make sure PCIDAS_CALIB_EN is disabled */
	outw(0, devpriv->pcibar1 + PCIDAS_CALIB_REG);
	/*  initialize before settings pacer source and count values */
	outw(PCIDAS_TRIG_SEL_NONE, devpriv->pcibar1 + PCIDAS_TRIG_REG);
	/*  clear fifo */
	outw(0, devpriv->pcibar2 + PCIDAS_AI_FIFO_CLR_REG);

	/*  set mux limits, gain and pacer source */
	bits = PCIDAS_AI_FIRST(CR_CHAN(cmd->chanlist[0])) |
	       PCIDAS_AI_LAST(CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1])) |
	       PCIDAS_AI_GAIN(range0);
	/*  set unipolar/bipolar */
	if (comedi_range_is_unipolar(s, range0))
		bits |= PCIDAS_AI_UNIP;
	/*  set singleended/differential */
	if (CR_AREF(cmd->chanlist[0]) != AREF_DIFF)
		bits |= PCIDAS_AI_SE;
	/*  set pacer source */
	if (cmd->convert_src == TRIG_EXT || cmd->scan_begin_src == TRIG_EXT)
		bits |= PCIDAS_AI_PACER_EXTP;
	else
		bits |= PCIDAS_AI_PACER_INT;
	outw(bits, devpriv->pcibar1 + PCIDAS_AI_REG);

	/*  load counters */
	if (cmd->scan_begin_src == TRIG_TIMER ||
	    cmd->convert_src == TRIG_TIMER) {
		comedi_8254_update_divisors(dev->pacer);
		comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
	}

	/*  enable interrupts */
	spin_lock_irqsave(&dev->spinlock, flags);
	devpriv->ctrl |= PCIDAS_CTRL_INTE;
	devpriv->ctrl &= ~PCIDAS_CTRL_INT_MASK;
	if (cmd->flags & CMDF_WAKE_EOS) {
		if (cmd->convert_src == TRIG_NOW && cmd->chanlist_len > 1) {
			/* interrupt end of burst */
			devpriv->ctrl |= PCIDAS_CTRL_INT_EOS;
		} else {
			/* interrupt fifo not empty */
			devpriv->ctrl |= PCIDAS_CTRL_INT_FNE;
		}
	} else {
		/* interrupt fifo half full */
		devpriv->ctrl |= PCIDAS_CTRL_INT_FHF;
	}

	/*  enable (and clear) interrupts */
	outw(devpriv->ctrl |
	     PCIDAS_CTRL_EOAI | PCIDAS_CTRL_INT_CLR | PCIDAS_CTRL_LADFUL,
	     devpriv->pcibar1 + PCIDAS_CTRL_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	/*  set start trigger and burst mode */
	bits = 0;
	if (cmd->start_src == TRIG_NOW) {
		bits |= PCIDAS_TRIG_SEL_SW;
	} else {	/* TRIG_EXT */
		bits |= PCIDAS_TRIG_SEL_EXT | PCIDAS_TRIG_EN | PCIDAS_TRIG_CLR;
		if (board->is_1602) {
			if (cmd->start_arg & CR_INVERT)
				bits |= PCIDAS_TRIG_POL;
			if (cmd->start_arg & CR_EDGE)
				bits |= PCIDAS_TRIG_MODE;
		}
	}
	if (cmd->convert_src == TRIG_NOW && cmd->chanlist_len > 1)
		bits |= PCIDAS_TRIG_BURSTE;
	outw(bits, devpriv->pcibar1 + PCIDAS_TRIG_REG);

	return 0;
}

static int cb_pcidas_ao_check_chanlist(struct comedi_device *dev,
				       struct comedi_subdevice *s,
				       struct comedi_cmd *cmd)
{
	unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);

	if (cmd->chanlist_len > 1) {
		unsigned int chan1 = CR_CHAN(cmd->chanlist[1]);

		if (chan0 != 0 || chan1 != 1) {
			dev_dbg(dev->class_dev,
				"channels must be ordered channel 0, channel 1 in chanlist\n");
			return -EINVAL;
		}
	}

	return 0;
}

static int cb_pcidas_ao_cmdtest(struct comedi_device *dev,
				struct comedi_subdevice *s,
				struct comedi_cmd *cmd)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	struct cb_pcidas_private *devpriv = dev->private;
	int err = 0;

	/* Step 1 : check if triggers are trivially valid */

	err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT);
	err |= comedi_check_trigger_src(&cmd->scan_begin_src,
					TRIG_TIMER | TRIG_EXT);
	err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
	err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
	err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);

	if (err)
		return 1;

	/* Step 2a : make sure trigger sources are unique */

	err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
	err |= comedi_check_trigger_is_unique(cmd->stop_src);

	/* Step 2b : and mutually compatible */

	if (err)
		return 2;

	/* Step 3: check if arguments are trivially valid */

	err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);

	if (cmd->scan_begin_src == TRIG_TIMER) {
		err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
						    board->ao_scan_speed);
	}

	err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
					   cmd->chanlist_len);

	if (cmd->stop_src == TRIG_COUNT)
		err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
	else	/* TRIG_NONE */
		err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);

	if (err)
		return 3;

	/* step 4: fix up any arguments */

	if (cmd->scan_begin_src == TRIG_TIMER) {
		unsigned int arg = cmd->scan_begin_arg;

		comedi_8254_cascade_ns_to_timer(devpriv->ao_pacer,
						&arg, cmd->flags);
		err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
	}

	if (err)
		return 4;

	/* Step 5: check channel list if it exists */
	if (cmd->chanlist && cmd->chanlist_len > 0)
		err |= cb_pcidas_ao_check_chanlist(dev, s, cmd);

	if (err)
		return 5;

	return 0;
}

static int cb_pcidas_ai_cancel(struct comedi_device *dev,
			       struct comedi_subdevice *s)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned long flags;

	spin_lock_irqsave(&dev->spinlock, flags);
	/*  disable interrupts */
	devpriv->ctrl &= ~(PCIDAS_CTRL_INTE | PCIDAS_CTRL_EOAIE);
	outw(devpriv->ctrl, devpriv->pcibar1 + PCIDAS_CTRL_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	/*  disable start trigger source and burst mode */
	outw(PCIDAS_TRIG_SEL_NONE, devpriv->pcibar1 + PCIDAS_TRIG_REG);
	outw(PCIDAS_AI_PACER_SW, devpriv->pcibar1 + PCIDAS_AI_REG);

	return 0;
}

static void cb_pcidas_ao_load_fifo(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   unsigned int nsamples)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int nbytes;

	nsamples = comedi_nsamples_left(s, nsamples);
	nbytes = comedi_buf_read_samples(s, devpriv->ao_buffer, nsamples);

	nsamples = comedi_bytes_to_samples(s, nbytes);
	outsw(devpriv->pcibar4 + PCIDAS_AO_FIFO_REG,
	      devpriv->ao_buffer, nsamples);
}

static int cb_pcidas_ao_inttrig(struct comedi_device *dev,
				struct comedi_subdevice *s,
				unsigned int trig_num)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	struct cb_pcidas_private *devpriv = dev->private;
	struct comedi_async *async = s->async;
	struct comedi_cmd *cmd = &async->cmd;
	unsigned long flags;

	if (trig_num != cmd->start_arg)
		return -EINVAL;

	cb_pcidas_ao_load_fifo(dev, s, board->fifo_size);

	/*  enable dac half-full and empty interrupts */
	spin_lock_irqsave(&dev->spinlock, flags);
	devpriv->ctrl |= PCIDAS_CTRL_DAEMIE | PCIDAS_CTRL_DAHFIE;

	/*  enable and clear interrupts */
	outw(devpriv->ctrl | PCIDAS_CTRL_DAEMI | PCIDAS_CTRL_DAHFI,
	     devpriv->pcibar1 + PCIDAS_CTRL_REG);

	/*  start dac */
	devpriv->ao_ctrl |= PCIDAS_AO_START | PCIDAS_AO_DACEN | PCIDAS_AO_EMPTY;
	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);

	spin_unlock_irqrestore(&dev->spinlock, flags);

	async->inttrig = NULL;

	return 0;
}

static int cb_pcidas_ao_cmd(struct comedi_device *dev,
			    struct comedi_subdevice *s)
{
	struct cb_pcidas_private *devpriv = dev->private;
	struct comedi_async *async = s->async;
	struct comedi_cmd *cmd = &async->cmd;
	unsigned int i;
	unsigned long flags;

	/*  set channel limits, gain */
	spin_lock_irqsave(&dev->spinlock, flags);
	for (i = 0; i < cmd->chanlist_len; i++) {
		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
		unsigned int range = CR_RANGE(cmd->chanlist[i]);

		/*  enable channel */
		devpriv->ao_ctrl |= PCIDAS_AO_CHAN_EN(chan);
		/*  set range */
		devpriv->ao_ctrl |= PCIDAS_AO_RANGE(chan, range);
	}

	/*  disable analog out before settings pacer source and count values */
	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	/*  clear fifo */
	outw(0, devpriv->pcibar4 + PCIDAS_AO_FIFO_CLR_REG);

	/*  load counters */
	if (cmd->scan_begin_src == TRIG_TIMER) {
		comedi_8254_update_divisors(devpriv->ao_pacer);
		comedi_8254_pacer_enable(devpriv->ao_pacer, 1, 2, true);
	}

	/*  set pacer source */
	spin_lock_irqsave(&dev->spinlock, flags);
	switch (cmd->scan_begin_src) {
	case TRIG_TIMER:
		devpriv->ao_ctrl |= PCIDAS_AO_PACER_INT;
		break;
	case TRIG_EXT:
		devpriv->ao_ctrl |= PCIDAS_AO_PACER_EXTP;
		break;
	default:
		spin_unlock_irqrestore(&dev->spinlock, flags);
		dev_err(dev->class_dev, "error setting dac pacer source\n");
		return -1;
	}
	spin_unlock_irqrestore(&dev->spinlock, flags);

	async->inttrig = cb_pcidas_ao_inttrig;

	return 0;
}

static int cb_pcidas_ao_cancel(struct comedi_device *dev,
			       struct comedi_subdevice *s)
{
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned long flags;

	spin_lock_irqsave(&dev->spinlock, flags);
	/*  disable interrupts */
	devpriv->ctrl &= ~(PCIDAS_CTRL_DAHFIE | PCIDAS_CTRL_DAEMIE);
	outw(devpriv->ctrl, devpriv->pcibar1 + PCIDAS_CTRL_REG);

	/*  disable output */
	devpriv->ao_ctrl &= ~(PCIDAS_AO_DACEN | PCIDAS_AO_PACER_MASK);
	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	return 0;
}

static unsigned int cb_pcidas_ao_interrupt(struct comedi_device *dev,
					   unsigned int status)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	struct cb_pcidas_private *devpriv = dev->private;
	struct comedi_subdevice *s = dev->write_subdev;
	struct comedi_async *async = s->async;
	struct comedi_cmd *cmd = &async->cmd;
	unsigned int irq_clr = 0;

	if (status & PCIDAS_CTRL_DAEMI) {
		irq_clr |= PCIDAS_CTRL_DAEMI;

		if (inw(devpriv->pcibar4 + PCIDAS_AO_REG) & PCIDAS_AO_EMPTY) {
			if (cmd->stop_src == TRIG_COUNT &&
			    async->scans_done >= cmd->stop_arg) {
				async->events |= COMEDI_CB_EOA;
			} else {
				dev_err(dev->class_dev, "dac fifo underflow\n");
				async->events |= COMEDI_CB_ERROR;
			}
		}
	} else if (status & PCIDAS_CTRL_DAHFI) {
		irq_clr |= PCIDAS_CTRL_DAHFI;

		cb_pcidas_ao_load_fifo(dev, s, board->fifo_size / 2);
	}

	comedi_handle_events(dev, s);

	return irq_clr;
}

static unsigned int cb_pcidas_ai_interrupt(struct comedi_device *dev,
					   unsigned int status)
{
	const struct cb_pcidas_board *board = dev->board_ptr;
	struct cb_pcidas_private *devpriv = dev->private;
	struct comedi_subdevice *s = dev->read_subdev;
	struct comedi_async *async = s->async;
	struct comedi_cmd *cmd = &async->cmd;
	unsigned int irq_clr = 0;

	if (status & PCIDAS_CTRL_ADHFI) {
		unsigned int num_samples;

		irq_clr |= PCIDAS_CTRL_INT_CLR;

		/* FIFO is half-full - read data */
		num_samples = comedi_nsamples_left(s, board->fifo_size / 2);
		insw(devpriv->pcibar2 + PCIDAS_AI_DATA_REG,
		     devpriv->ai_buffer, num_samples);
		comedi_buf_write_samples(s, devpriv->ai_buffer, num_samples);

		if (cmd->stop_src == TRIG_COUNT &&
		    async->scans_done >= cmd->stop_arg)
			async->events |= COMEDI_CB_EOA;
	} else if (status & (PCIDAS_CTRL_ADNEI | PCIDAS_CTRL_EOBI)) {
		unsigned int i;

		irq_clr |= PCIDAS_CTRL_INT_CLR;

		/* FIFO is not empty - read data until empty or timeoout */
		for (i = 0; i < 10000; i++) {
			unsigned short val;

			/*  break if fifo is empty */
			if ((inw(devpriv->pcibar1 + PCIDAS_CTRL_REG) &
			    PCIDAS_CTRL_ADNE) == 0)
				break;
			val = inw(devpriv->pcibar2 + PCIDAS_AI_DATA_REG);
			comedi_buf_write_samples(s, &val, 1);

			if (cmd->stop_src == TRIG_COUNT &&
			    async->scans_done >= cmd->stop_arg) {
				async->events |= COMEDI_CB_EOA;
				break;
			}
		}
	} else if (status & PCIDAS_CTRL_EOAI) {
		irq_clr |= PCIDAS_CTRL_EOAI;

		dev_err(dev->class_dev,
			"bug! encountered end of acquisition interrupt?\n");
	}

	/* check for fifo overflow */
	if (status & PCIDAS_CTRL_LADFUL) {
		irq_clr |= PCIDAS_CTRL_LADFUL;

		dev_err(dev->class_dev, "fifo overflow\n");
		async->events |= COMEDI_CB_ERROR;
	}

	comedi_handle_events(dev, s);

	return irq_clr;
}

static irqreturn_t cb_pcidas_interrupt(int irq, void *d)
{
	struct comedi_device *dev = d;
	struct cb_pcidas_private *devpriv = dev->private;
	unsigned int irq_clr = 0;
	unsigned int amcc_status;
	unsigned int status;

	if (!dev->attached)
		return IRQ_NONE;

	amcc_status = inl(devpriv->amcc + AMCC_OP_REG_INTCSR);

	if ((INTCSR_INTR_ASSERTED & amcc_status) == 0)
		return IRQ_NONE;

	/*  make sure mailbox 4 is empty */
	inl_p(devpriv->amcc + AMCC_OP_REG_IMB4);
	/*  clear interrupt on amcc s5933 */
	outl(devpriv->amcc_intcsr | INTCSR_INBOX_INTR_STATUS,
	     devpriv->amcc + AMCC_OP_REG_INTCSR);

	status = inw(devpriv->pcibar1 + PCIDAS_CTRL_REG);

	/* handle analog output interrupts */
	if (status & PCIDAS_CTRL_AO_INT)
		irq_clr |= cb_pcidas_ao_interrupt(dev, status);

	/* handle analog input interrupts */
	if (status & PCIDAS_CTRL_AI_INT)
		irq_clr |= cb_pcidas_ai_interrupt(dev, status);

	if (irq_clr) {
		unsigned long flags;

		spin_lock_irqsave(&dev->spinlock, flags);
		outw(devpriv->ctrl | irq_clr,
		     devpriv->pcibar1 + PCIDAS_CTRL_REG);
		spin_unlock_irqrestore(&dev->spinlock, flags);
	}

	return IRQ_HANDLED;
}

static int cb_pcidas_auto_attach(struct comedi_device *dev,
				 unsigned long context)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct cb_pcidas_board *board = NULL;
	struct cb_pcidas_private *devpriv;
	struct comedi_subdevice *s;
	int i;
	int ret;

	if (context < ARRAY_SIZE(cb_pcidas_boards))
		board = &cb_pcidas_boards[context];
	if (!board)
		return -ENODEV;
	dev->board_ptr  = board;
	dev->board_name = board->name;

	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
	if (!devpriv)
		return -ENOMEM;

	ret = comedi_pci_enable(dev);
	if (ret)
		return ret;

	devpriv->amcc = pci_resource_start(pcidev, 0);
	devpriv->pcibar1 = pci_resource_start(pcidev, 1);
	devpriv->pcibar2 = pci_resource_start(pcidev, 2);
	dev->iobase = pci_resource_start(pcidev, 3);
	if (board->has_ao)
		devpriv->pcibar4 = pci_resource_start(pcidev, 4);

	/*  disable and clear interrupts on amcc s5933 */
	outl(INTCSR_INBOX_INTR_STATUS,
	     devpriv->amcc + AMCC_OP_REG_INTCSR);

	ret = request_irq(pcidev->irq, cb_pcidas_interrupt, IRQF_SHARED,
			  dev->board_name, dev);
	if (ret) {
		dev_dbg(dev->class_dev, "unable to allocate irq %d\n",
			pcidev->irq);
		return ret;
	}
	dev->irq = pcidev->irq;

	dev->pacer = comedi_8254_init(dev->iobase + PCIDAS_AI_8254_BASE,
				      I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
	if (!dev->pacer)
		return -ENOMEM;

	devpriv->ao_pacer = comedi_8254_init(dev->iobase + PCIDAS_AO_8254_BASE,
					     I8254_OSC_BASE_10MHZ,
					     I8254_IO8, 0);
	if (!devpriv->ao_pacer)
		return -ENOMEM;

	ret = comedi_alloc_subdevices(dev, 7);
	if (ret)
		return ret;

	/* Analog Input subdevice */
	s = &dev->subdevices[0];
	s->type		= COMEDI_SUBD_AI;
	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_DIFF;
	s->n_chan	= 16;
	s->maxdata	= board->is_16bit ? 0xffff : 0x0fff;
	s->range_table	= board->use_alt_range ? &cb_pcidas_alt_ranges
					       : &cb_pcidas_ranges;
	s->insn_read	= cb_pcidas_ai_insn_read;
	s->insn_config	= cb_pcidas_ai_insn_config;
	if (dev->irq) {
		dev->read_subdev = s;
		s->subdev_flags	|= SDF_CMD_READ;
		s->len_chanlist	= s->n_chan;
		s->do_cmd	= cb_pcidas_ai_cmd;
		s->do_cmdtest	= cb_pcidas_ai_cmdtest;
		s->cancel	= cb_pcidas_ai_cancel;
	}

	/* Analog Output subdevice */
	s = &dev->subdevices[1];
	if (board->has_ao) {
		s->type		= COMEDI_SUBD_AO;
		s->subdev_flags	= SDF_WRITABLE | SDF_GROUND;
		s->n_chan	= 2;
		s->maxdata	= board->is_16bit ? 0xffff : 0x0fff;
		s->range_table	= &cb_pcidas_ao_ranges;
		s->insn_write	= (board->has_ao_fifo)
					? cb_pcidas_ao_fifo_insn_write
					: cb_pcidas_ao_nofifo_insn_write;

		ret = comedi_alloc_subdev_readback(s);
		if (ret)
			return ret;

		if (dev->irq && board->has_ao_fifo) {
			dev->write_subdev = s;
			s->subdev_flags	|= SDF_CMD_WRITE;
			s->do_cmdtest	= cb_pcidas_ao_cmdtest;
			s->do_cmd	= cb_pcidas_ao_cmd;
			s->cancel	= cb_pcidas_ao_cancel;
		}
	} else {
		s->type		= COMEDI_SUBD_UNUSED;
	}

	/* 8255 */
	s = &dev->subdevices[2];
	ret = subdev_8255_init(dev, s, NULL, PCIDAS_8255_BASE);
	if (ret)
		return ret;

	/* Memory subdevice - serial EEPROM */
	s = &dev->subdevices[3];
	s->type		= COMEDI_SUBD_MEMORY;
	s->subdev_flags	= SDF_READABLE | SDF_INTERNAL;
	s->n_chan	= 256;
	s->maxdata	= 0xff;
	s->insn_read	= cb_pcidas_eeprom_insn_read;

	/* Calibration subdevice - 8800 caldac */
	s = &dev->subdevices[4];
	s->type		= COMEDI_SUBD_CALIB;
	s->subdev_flags	= SDF_WRITABLE | SDF_INTERNAL;
	s->n_chan	= 8;
	s->maxdata	= 0xff;
	s->insn_write	= cb_pcidas_caldac_insn_write;

	ret = comedi_alloc_subdev_readback(s);
	if (ret)
		return ret;

	for (i = 0; i < s->n_chan; i++) {
		unsigned int val = s->maxdata / 2;

		/* write 11-bit channel/value to caldac */
		cb_pcidas_calib_write(dev, (i << 8) | val, 11, false);
		s->readback[i] = val;
	}

	/* Calibration subdevice - trim potentiometer */
	s = &dev->subdevices[5];
	s->type		= COMEDI_SUBD_CALIB;
	s->subdev_flags	= SDF_WRITABLE | SDF_INTERNAL;
	if (board->has_ad8402) {
		/*
		 * pci-das1602/16 have an AD8402 trimpot:
		 *   chan 0 : adc gain
		 *   chan 1 : adc postgain offset
		 */
		s->n_chan	= 2;
		s->maxdata	= 0xff;
	} else {
		/* all other boards have an AD7376 trimpot */
		s->n_chan	= 1;
		s->maxdata	= 0x7f;
	}
	s->insn_write	= cb_pcidas_trimpot_insn_write;

	ret = comedi_alloc_subdev_readback(s);
	if (ret)
		return ret;

	for (i = 0; i < s->n_chan; i++) {
		cb_pcidas_trimpot_write(dev, i, s->maxdata / 2);
		s->readback[i] = s->maxdata / 2;
	}

	/* Calibration subdevice - pci-das1602/16 pregain offset (dac08) */
	s = &dev->subdevices[6];
	if (board->has_dac08) {
		s->type		= COMEDI_SUBD_CALIB;
		s->subdev_flags	= SDF_WRITABLE | SDF_INTERNAL;
		s->n_chan	= 1;
		s->maxdata	= 0xff;
		s->insn_write	= cb_pcidas_dac08_insn_write;

		ret = comedi_alloc_subdev_readback(s);
		if (ret)
			return ret;

		for (i = 0; i < s->n_chan; i++) {
			cb_pcidas_dac08_write(dev, s->maxdata / 2);
			s->readback[i] = s->maxdata / 2;
		}
	} else {
		s->type		= COMEDI_SUBD_UNUSED;
	}

	/*  make sure mailbox 4 is empty */
	inl(devpriv->amcc + AMCC_OP_REG_IMB4);
	/* Set bits to enable incoming mailbox interrupts on amcc s5933. */
	devpriv->amcc_intcsr = INTCSR_INBOX_BYTE(3) | INTCSR_INBOX_SELECT(3) |
			       INTCSR_INBOX_FULL_INT;
	/*  clear and enable interrupt on amcc s5933 */
	outl(devpriv->amcc_intcsr | INTCSR_INBOX_INTR_STATUS,
	     devpriv->amcc + AMCC_OP_REG_INTCSR);

	return 0;
}

static void cb_pcidas_detach(struct comedi_device *dev)
{
	struct cb_pcidas_private *devpriv = dev->private;

	if (devpriv) {
		if (devpriv->amcc)
			outl(INTCSR_INBOX_INTR_STATUS,
			     devpriv->amcc + AMCC_OP_REG_INTCSR);
		kfree(devpriv->ao_pacer);
	}
	comedi_pci_detach(dev);
}

static struct comedi_driver cb_pcidas_driver = {
	.driver_name	= "cb_pcidas",
	.module		= THIS_MODULE,
	.auto_attach	= cb_pcidas_auto_attach,
	.detach		= cb_pcidas_detach,
};

static int cb_pcidas_pci_probe(struct pci_dev *dev,
			       const struct pci_device_id *id)
{
	return comedi_pci_auto_config(dev, &cb_pcidas_driver,
				      id->driver_data);
}

static const struct pci_device_id cb_pcidas_pci_table[] = {
	{ PCI_VDEVICE(CB, 0x0001), BOARD_PCIDAS1602_16 },
	{ PCI_VDEVICE(CB, 0x000f), BOARD_PCIDAS1200 },
	{ PCI_VDEVICE(CB, 0x0010), BOARD_PCIDAS1602_12 },
	{ PCI_VDEVICE(CB, 0x0019), BOARD_PCIDAS1200_JR },
	{ PCI_VDEVICE(CB, 0x001c), BOARD_PCIDAS1602_16_JR },
	{ PCI_VDEVICE(CB, 0x004c), BOARD_PCIDAS1000 },
	{ PCI_VDEVICE(CB, 0x001a), BOARD_PCIDAS1001 },
	{ PCI_VDEVICE(CB, 0x001b), BOARD_PCIDAS1002 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, cb_pcidas_pci_table);

static struct pci_driver cb_pcidas_pci_driver = {
	.name		= "cb_pcidas",
	.id_table	= cb_pcidas_pci_table,
	.probe		= cb_pcidas_pci_probe,
	.remove		= comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(cb_pcidas_driver, cb_pcidas_pci_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for MeasurementComputing PCI-DAS series");
MODULE_LICENSE("GPL");