aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/cdrom/aztcd.c
blob: 1f9fb7a9670314403d6981166f2544e22ceac9a5 (plain) (tree)
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
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492











































































































































































                                                                                       





























































































































                                                                                                        
                                             
























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                               
                                                           

























































































































































                                                                                                                




























































































































































































































































































































































































































































































































































































                                                                                                                     
#define AZT_VERSION "2.60"

/*      $Id: aztcd.c,v 2.60 1997/11/29 09:51:19 root Exp root $
	linux/drivers/block/aztcd.c - Aztech CD268 CDROM driver

	Copyright (C) 1994-98 Werner Zimmermann(Werner.Zimmermann@fht-esslingen.de)

	based on Mitsumi CDROM driver by  Martin Hariss and preworks by
	Eberhard Moenkeberg; contains contributions by Joe Nardone and Robby 
	Schirmer.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	HISTORY
	V0.0    Adaption to Aztech CD268-01A Version 1.3
		Version is PRE_ALPHA, unresolved points:
		1. I use busy wait instead of timer wait in STEN_LOW,DTEN_LOW
		   thus driver causes CPU overhead and is very slow 
		2. could not find a way to stop the drive, when it is
		   in data read mode, therefore I had to set
		   msf.end.min/sec/frame to 0:0:1 (in azt_poll); so only one
		   frame can be read in sequence, this is also the reason for
		3. getting 'timeout in state 4' messages, but nevertheless
		   it works
		W.Zimmermann, Oct. 31, 1994
	V0.1    Version is ALPHA, problems #2 and #3 resolved.  
		W.Zimmermann, Nov. 3, 1994
	V0.2    Modification to some comments, debugging aids for partial test
		with Borland C under DOS eliminated. Timer interrupt wait 
		STEN_LOW_WAIT additionally to busy wait for STEN_LOW implemented; 
		use it only for the 'slow' commands (ACMD_GET_Q_CHANNEL, ACMD_
		SEEK_TO_LEAD_IN), all other commands are so 'fast', that busy 
		waiting seems better to me than interrupt rescheduling.
		Besides that, when used in the wrong place, STEN_LOW_WAIT causes
		kernel panic.
		In function aztPlay command ACMD_PLAY_AUDIO added, should make
		audio functions work. The Aztech drive needs different commands
		to read data tracks and play audio tracks.
		W.Zimmermann, Nov. 8, 1994
	V0.3    Recognition of missing drive during boot up improved (speeded up).
		W.Zimmermann, Nov. 13, 1994
	V0.35   Rewrote the control mechanism in azt_poll (formerly mcd_poll) 
		including removal of all 'goto' commands. :-); 
		J. Nardone, Nov. 14, 1994
	V0.4    Renamed variables and constants to 'azt' instead of 'mcd'; had
		to make some "compatibility" defines in azt.h; please note,
		that the source file was renamed to azt.c, the include file to
		azt.h                
		Speeded up drive recognition during init (will be a little bit 
		slower than before if no drive is installed!); suggested by
		Robby Schirmer.
		read_count declared volatile and set to AZT_BUF_SIZ to make
		drive faster (now 300kB/sec, was 60kB/sec before, measured
		by 'time dd if=/dev/cdrom of=/dev/null bs=2048 count=4096';
		different AZT_BUF_SIZes were test, above 16 no further im-
		provement seems to be possible; suggested by E.Moenkeberg.
		W.Zimmermann, Nov. 18, 1994
	V0.42   Included getAztStatus command in GetQChannelInfo() to allow
		reading Q-channel info on audio disks, if drive is stopped, 
		and some other bug fixes in the audio stuff, suggested by 
		Robby Schirmer.
		Added more ioctls (reading data in mode 1 and mode 2).
		Completely removed the old azt_poll() routine.
		Detection of ORCHID CDS-3110 in aztcd_init implemented.
		Additional debugging aids (see the readme file).
		W.Zimmermann, Dec. 9, 1994  
	V0.50   Autodetection of drives implemented.
		W.Zimmermann, Dec. 12, 1994
	V0.52   Prepared for including in the standard kernel, renamed most
		variables to contain 'azt', included autoconf.h
		W.Zimmermann, Dec. 16, 1994        
	V0.6    Version for being included in the standard Linux kernel.
		Renamed source and header file to aztcd.c and aztcd.h
		W.Zimmermann, Dec. 24, 1994
	V0.7    Changed VERIFY_READ to VERIFY_WRITE in aztcd_ioctl, case
		CDROMREADMODE1 and CDROMREADMODE2; bug fix in the ioctl,
		which causes kernel crashes when playing audio, changed 
		include-files (config.h instead of autoconf.h, removed
		delay.h)
		W.Zimmermann, Jan. 8, 1995
	V0.72   Some more modifications for adaption to the standard kernel.
		W.Zimmermann, Jan. 16, 1995
        V0.80   aztcd is now part of the standard kernel since version 1.1.83.
                Modified the SET_TIMER and CLEAR_TIMER macros to comply with
                the new timer scheme.
                W.Zimmermann, Jan. 21, 1995
        V0.90   Included CDROMVOLCTRL, but with my Aztech drive I can only turn
                the channels on and off. If it works better with your drive, 
                please mail me. Also implemented ACMD_CLOSE for CDROMSTART.
                W.Zimmermann, Jan. 24, 1995
        V1.00   Implemented close and lock tray commands. Patches supplied by
		Frank Racis        
                Added support for loadable MODULEs, so aztcd can now also be
                loaded by insmod and removed by rmmod during run time
                Werner Zimmermann, Mar. 24, 95
        V1.10   Implemented soundcard configuration for Orchid CDS-3110 drives
                connected to Soundwave32 cards. Release for LST 2.1.
                (still experimental)
                Werner Zimmermann, May 8, 95
        V1.20   Implemented limited support for DOSEMU0.60's cdrom.c. Now it works, but
                sometimes DOSEMU may hang for 30 seconds or so. A fully functional ver-
                sion needs an update of Dosemu0.60's cdrom.c, which will come with the 
                next revision of Dosemu.
                Also Soundwave32 support now works.
                Werner Zimmermann, May 22, 95
	V1.30   Auto-eject feature. Inspired by Franc Racis (racis@psu.edu)
	        Werner Zimmermann, July 4, 95
	V1.40   Started multisession support. Implementation copied from mcdx.c
	        by Heiko Schlittermann. Not tested yet.
	        Werner Zimmermann, July 15, 95
        V1.50   Implementation of ioctl CDROMRESET, continued multisession, began
                XA, but still untested. Heavy modifications to drive status de-
                tection.
                Werner Zimmermann, July 25, 95
        V1.60   XA support now should work. Speeded up drive recognition in cases, 
                where no drive is installed.
                Werner Zimmermann, August 8, 1995
        V1.70   Multisession support now is completed, but there is still not 
                enough testing done. If you can test it, please contact me. For
                details please read Documentation/cdrom/aztcd
                Werner Zimmermann, August 19, 1995
        V1.80   Modification to suit the new kernel boot procedure introduced
                with kernel 1.3.33. Will definitely not work with older kernels.
                Programming done by Linus himself.
                Werner Zimmermann, October 11, 1995
	V1.90   Support for Conrad TXC drives, thank's to Jochen Kunz and Olaf Kaluza.
	        Werner Zimmermann, October 21, 1995
        V2.00   Changed #include "blk.h" to <linux/blk.h> as the directory
                structure was changed. README.aztcd is now /usr/src/docu-
                mentation/cdrom/aztcd
                Werner Zimmermann, November 10, 95
        V2.10   Started to modify azt_poll to prevent reading beyond end of
                tracks.
                Werner Zimmermann, December 3, 95
        V2.20   Changed some comments
                Werner Zimmermann, April 1, 96
        V2.30   Implemented support for CyCDROM CR520, CR940, Code for CR520 
        	delivered by H.Berger with preworks by E.Moenkeberg.
                Werner Zimmermann, April 29, 96
        V2.40   Reorganized the placement of functions in the source code file
                to reflect the layered approach; did not actually change code
                Werner Zimmermann, May 1, 96
        V2.50   Heiko Eissfeldt suggested to remove some VERIFY_READs in 
                aztcd_ioctl; check_aztcd_media_change modified 
                Werner Zimmermann, May 16, 96       
	V2.60   Implemented Auto-Probing; made changes for kernel's 2.1.xx blocksize
                Adaption to linux kernel > 2.1.0
		Werner Zimmermann, Nov 29, 97
		
        November 1999 -- Make kernel-parameter implementation work with 2.3.x 
	                 Removed init_module & cleanup_module in favor of 
			 module_init & module_exit.
			 Torben Mathiasen <tmm@image.dk>
*/

#include <linux/blkdev.h>
#include "aztcd.h"

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/cdrom.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/major.h>

#include <linux/init.h>

#include <asm/system.h>
#include <asm/io.h>

#include <asm/uaccess.h>

/*###########################################################################
  Defines
  ###########################################################################
*/

#define MAJOR_NR AZTECH_CDROM_MAJOR
#define QUEUE (azt_queue)
#define CURRENT elv_next_request(azt_queue)
#define SET_TIMER(func, jifs)   delay_timer.expires = jiffies + (jifs); \
                                delay_timer.function = (void *) (func); \
                                add_timer(&delay_timer);

#define CLEAR_TIMER             del_timer(&delay_timer);

#define RETURNM(message,value) {printk("aztcd: Warning: %s failed\n",message);\
                                return value;}
#define RETURN(message)        {printk("aztcd: Warning: %s failed\n",message);\
                                return;}

/* Macros to switch the IDE-interface to the slave device and back to the master*/
#define SWITCH_IDE_SLAVE  outb_p(0xa0,azt_port+6); \
	                  outb_p(0x10,azt_port+6); \
	                  outb_p(0x00,azt_port+7); \
	                  outb_p(0x10,azt_port+6);
#define SWITCH_IDE_MASTER outb_p(0xa0,azt_port+6);


#if 0
#define AZT_TEST
#define AZT_TEST1		/* <int-..> */
#define AZT_TEST2		/* do_aztcd_request */
#define AZT_TEST3		/* AZT_S_state */
#define AZT_TEST4		/* QUICK_LOOP-counter */
#define AZT_TEST5		/* port(1) state */
#define AZT_DEBUG
#define AZT_DEBUG_MULTISESSION
#endif

static struct request_queue *azt_queue;

static int current_valid(void)
{
        return CURRENT &&
		CURRENT->cmd == READ &&
		CURRENT->sector != -1;
}

#define AFL_STATUSorDATA (AFL_STATUS | AFL_DATA)
#define AZT_BUF_SIZ 16

#define READ_TIMEOUT 3000

#define azt_port aztcd		/*needed for the modutils */

/*##########################################################################
  Type Definitions
  ##########################################################################
*/
enum azt_state_e { AZT_S_IDLE,	/* 0 */
	AZT_S_START,		/* 1 */
	AZT_S_MODE,		/* 2 */
	AZT_S_READ,		/* 3 */
	AZT_S_DATA,		/* 4 */
	AZT_S_STOP,		/* 5 */
	AZT_S_STOPPING		/* 6 */
};
enum azt_read_modes { AZT_MODE_0,	/*read mode for audio disks, not supported by Aztech firmware */
	AZT_MODE_1,		/*read mode for normal CD-ROMs */
	AZT_MODE_2		/*read mode for XA CD-ROMs */
};

/*##########################################################################
  Global Variables
  ##########################################################################
*/
static int aztPresent = 0;

static volatile int azt_transfer_is_active = 0;

static char azt_buf[CD_FRAMESIZE_RAW * AZT_BUF_SIZ];	/*buffer for block size conversion */
#if AZT_PRIVATE_IOCTLS
static char buf[CD_FRAMESIZE_RAW];	/*separate buffer for the ioctls */
#endif

static volatile int azt_buf_bn[AZT_BUF_SIZ], azt_next_bn;
static volatile int azt_buf_in, azt_buf_out = -1;
static volatile int azt_error = 0;
static int azt_open_count = 0;
static volatile enum azt_state_e azt_state = AZT_S_IDLE;
#ifdef AZT_TEST3
static volatile enum azt_state_e azt_state_old = AZT_S_STOP;
static volatile int azt_st_old = 0;
#endif
static volatile enum azt_read_modes azt_read_mode = AZT_MODE_1;

static int azt_mode = -1;
static volatile int azt_read_count = 1;

static int azt_port = AZT_BASE_ADDR;

module_param(azt_port, int, 0);

static int azt_port_auto[16] = AZT_BASE_AUTO;

static char azt_cont = 0;
static char azt_init_end = 0;
static char azt_auto_eject = AZT_AUTO_EJECT;

static int AztTimeout, AztTries;
static DECLARE_WAIT_QUEUE_HEAD(azt_waitq);
static DEFINE_TIMER(delay_timer, NULL, 0, 0);

static struct azt_DiskInfo DiskInfo;
static struct azt_Toc Toc[MAX_TRACKS];
static struct azt_Play_msf azt_Play;

static int aztAudioStatus = CDROM_AUDIO_NO_STATUS;
static char aztDiskChanged = 1;
static char aztTocUpToDate = 0;

static unsigned char aztIndatum;
static unsigned long aztTimeOutCount;
static int aztCmd = 0;

static DEFINE_SPINLOCK(aztSpin);

/*###########################################################################
   Function Prototypes
  ###########################################################################
*/
/* CDROM Drive Low Level I/O Functions */
static void aztStatTimer(void);

/* CDROM Drive Command Functions */
static int aztGetDiskInfo(void);
#if AZT_MULTISESSION
static int aztGetMultiDiskInfo(void);
#endif
static int aztGetToc(int multi);

/* Kernel Interface Functions */
static int check_aztcd_media_change(struct gendisk *disk);
static int aztcd_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
		       unsigned long arg);
static int aztcd_open(struct inode *ip, struct file *fp);
static int aztcd_release(struct inode *inode, struct file *file);

static struct block_device_operations azt_fops = {
	.owner		= THIS_MODULE,
	.open		= aztcd_open,
	.release	= aztcd_release,
	.ioctl		= aztcd_ioctl,
	.media_changed	= check_aztcd_media_change,
};

/* Aztcd State Machine: Controls Drive Operating State */
static void azt_poll(void);

/* Miscellaneous support functions */
static void azt_hsg2msf(long hsg, struct msf *msf);
static long azt_msf2hsg(struct msf *mp);
static void azt_bin2bcd(unsigned char *p);
static int azt_bcd2bin(unsigned char bcd);

/*##########################################################################
  CDROM Drive Low Level I/O Functions
  ##########################################################################
*/
/* Macros for the drive hardware interface handshake, these macros use
   busy waiting */
/* Wait for OP_OK = drive answers with AFL_OP_OK after receiving a command*/
# define OP_OK op_ok()
static void op_ok(void)
{
	aztTimeOutCount = 0;
	do {
		aztIndatum = inb(DATA_PORT);
		aztTimeOutCount++;
		if (aztTimeOutCount >= AZT_TIMEOUT) {
			printk("aztcd: Error Wait OP_OK\n");
			break;
		}
	} while (aztIndatum != AFL_OP_OK);
}

/* Wait for PA_OK = drive answers with AFL_PA_OK after receiving parameters*/
#if 0
# define PA_OK pa_ok()
static void pa_ok(void)
{
	aztTimeOutCount = 0;
	do {
		aztIndatum = inb(DATA_PORT);
		aztTimeOutCount++;
		if (aztTimeOutCount >= AZT_TIMEOUT) {
			printk("aztcd: Error Wait PA_OK\n");
			break;
		}
	} while (aztIndatum != AFL_PA_OK);
}
#endif

/* Wait for STEN=Low = handshake signal 'AFL_.._OK available or command executed*/
# define STEN_LOW  sten_low()
static void sten_low(void)
{
	aztTimeOutCount = 0;
	do {
		aztIndatum = inb(STATUS_PORT);
		aztTimeOutCount++;
		if (aztTimeOutCount >= AZT_TIMEOUT) {
			if (azt_init_end)
				printk
				    ("aztcd: Error Wait STEN_LOW commands:%x\n",
				     aztCmd);
			break;
		}
	} while (aztIndatum & AFL_STATUS);
}

/* Wait for DTEN=Low = handshake signal 'Data available'*/
# define DTEN_LOW dten_low()
static void dten_low(void)
{
	aztTimeOutCount = 0;
	do {
		aztIndatum = inb(STATUS_PORT);
		aztTimeOutCount++;
		if (aztTimeOutCount >= AZT_TIMEOUT) {
			printk("aztcd: Error Wait DTEN_OK\n");
			break;
		}
	} while (aztIndatum & AFL_DATA);
}

/* 
 * Macro for timer wait on STEN=Low, should only be used for 'slow' commands;
 * may cause kernel panic when used in the wrong place
*/
#define STEN_LOW_WAIT   statusAzt()
static void statusAzt(void)
{
	AztTimeout = AZT_STATUS_DELAY;
	SET_TIMER(aztStatTimer, HZ / 100);
	sleep_on(&azt_waitq);
	if (AztTimeout <= 0)
		printk("aztcd: Error Wait STEN_LOW_WAIT command:%x\n",
		       aztCmd);
	return;
}

static void aztStatTimer(void)
{
	if (!(inb(STATUS_PORT) & AFL_STATUS)) {
		wake_up(&azt_waitq);
		return;
	}
	AztTimeout--;
	if (AztTimeout <= 0) {
		wake_up(&azt_waitq);
		printk("aztcd: Error aztStatTimer: Timeout\n");
		return;
	}
	SET_TIMER(aztStatTimer, HZ / 100);
}

/*##########################################################################
  CDROM Drive Command Functions
  ##########################################################################
*/
/* 
 * Send a single command, return -1 on error, else 0
*/
static int aztSendCmd(int cmd)
{
	unsigned char data;
	int retry;

#ifdef AZT_DEBUG
	printk("aztcd: Executing command %x\n", cmd);
#endif

	if ((azt_port == 0x1f0) || (azt_port == 0x170))
		SWITCH_IDE_SLAVE;	/*switch IDE interface to slave configuration */

	aztCmd = cmd;
	outb(POLLED, MODE_PORT);
	do {
		if (inb(STATUS_PORT) & AFL_STATUS)
			break;
		inb(DATA_PORT);	/* if status left from last command, read and */
	} while (1);		/* discard it */
	do {
		if (inb(STATUS_PORT) & AFL_DATA)
			break;
		inb(DATA_PORT);	/* if data left from last command, read and */
	} while (1);		/* discard it */
	for (retry = 0; retry < AZT_RETRY_ATTEMPTS; retry++) {
		outb((unsigned char) cmd, CMD_PORT);
		STEN_LOW;
		data = inb(DATA_PORT);
		if (data == AFL_OP_OK) {
			return 0;
		}		/*OP_OK? */
		if (data == AFL_OP_ERR) {
			STEN_LOW;
			data = inb(DATA_PORT);
			printk
			    ("### Error 1 aztcd: aztSendCmd %x  Error Code %x\n",
			     cmd, data);
		}
	}
	if (retry >= AZT_RETRY_ATTEMPTS) {
		printk("### Error 2 aztcd: aztSendCmd %x \n", cmd);
		azt_error = 0xA5;
	}
	RETURNM("aztSendCmd", -1);
}

/*
 * Send a play or read command to the drive, return -1 on error, else 0
*/
static int sendAztCmd(int cmd, struct azt_Play_msf *params)
{
	unsigned char data;
	int retry;

#ifdef AZT_DEBUG
	printk("aztcd: play start=%02x:%02x:%02x  end=%02x:%02x:%02x\n",
	       params->start.min, params->start.sec, params->start.frame,
	       params->end.min, params->end.sec, params->end.frame);
#endif
	for (retry = 0; retry < AZT_RETRY_ATTEMPTS; retry++) {
		aztSendCmd(cmd);
		outb(params->start.min, CMD_PORT);
		outb(params->start.sec, CMD_PORT);
		outb(params->start.frame, CMD_PORT);
		outb(params->end.min, CMD_PORT);
		outb(params->end.sec, CMD_PORT);
		outb(params->end.frame, CMD_PORT);
		STEN_LOW;
		data = inb(DATA_PORT);
		if (data == AFL_PA_OK) {
			return 0;
		}		/*PA_OK ? */
		if (data == AFL_PA_ERR) {
			STEN_LOW;
			data = inb(DATA_PORT);
			printk
			    ("### Error 1 aztcd: sendAztCmd %x  Error Code %x\n",
			     cmd, data);
		}
	}
	if (retry >= AZT_RETRY_ATTEMPTS) {
		printk("### Error 2 aztcd: sendAztCmd %x\n ", cmd);
		azt_error = 0xA5;
	}
	RETURNM("sendAztCmd", -1);
}

/*
 * Send a seek command to the drive, return -1 on error, else 0
*/
static int aztSeek(struct azt_Play_msf *params)
{
	unsigned char data;
	int retry;

#ifdef AZT_DEBUG
	printk("aztcd: aztSeek %02x:%02x:%02x\n",
	       params->start.min, params->start.sec, params->start.frame);
#endif
	for (retry = 0; retry < AZT_RETRY_ATTEMPTS; retry++) {
		aztSendCmd(ACMD_SEEK);
		outb(params->start.min, CMD_PORT);
		outb(params->start.sec, CMD_PORT);
		outb(params->start.frame, CMD_PORT);
		STEN_LOW;
		data = inb(DATA_PORT);
		if (data == AFL_PA_OK) {
			return 0;
		}		/*PA_OK ? */
		if (data == AFL_PA_ERR) {
			STEN_LOW;
			data = inb(DATA_PORT);
			printk("### Error 1 aztcd: aztSeek\n");
		}
	}
	if (retry >= AZT_RETRY_ATTEMPTS) {
		printk("### Error 2 aztcd: aztSeek\n ");
		azt_error = 0xA5;
	}
	RETURNM("aztSeek", -1);
}

/* Send a Set Disk Type command
   does not seem to work with Aztech drives, behavior is completely indepen-
   dent on which mode is set ???
*/
static int aztSetDiskType(int type)
{
	unsigned char data;
	int retry;

#ifdef AZT_DEBUG
	printk("aztcd: set disk type command: type= %i\n", type);
#endif
	for (retry = 0; retry < AZT_RETRY_ATTEMPTS; retry++) {
		aztSendCmd(ACMD_SET_DISK_TYPE);
		outb(type, CMD_PORT);
		STEN_LOW;
		data = inb(DATA_PORT);
		if (data == AFL_PA_OK) {	/*PA_OK ? */
			azt_read_mode = type;
			return 0;
		}
		if (data == AFL_PA_ERR) {
			STEN_LOW;
			data = inb(DATA_PORT);
			printk
			    ("### Error 1 aztcd: aztSetDiskType %x Error Code %x\n",
			     type, data);
		}
	}
	if (retry >= AZT_RETRY_ATTEMPTS) {
		printk("### Error 2 aztcd: aztSetDiskType %x\n ", type);
		azt_error = 0xA5;
	}
	RETURNM("aztSetDiskType", -1);
}


/* used in azt_poll to poll the status, expects another program to issue a 
 * ACMD_GET_STATUS directly before 
 */
static int aztStatus(void)
{
	int st;
/*	int i;

	i = inb(STATUS_PORT) & AFL_STATUS;    is STEN=0?    ???
	if (!i)
*/ STEN_LOW;
	if (aztTimeOutCount < AZT_TIMEOUT) {
		st = inb(DATA_PORT) & 0xFF;
		return st;
	} else
		RETURNM("aztStatus", -1);
}

/*
 * Get the drive status
 */
static int getAztStatus(void)
{
	int st;

	if (aztSendCmd(ACMD_GET_STATUS))
		RETURNM("getAztStatus 1", -1);
	STEN_LOW;
	st = inb(DATA_PORT) & 0xFF;
#ifdef AZT_DEBUG
	printk("aztcd: Status = %x\n", st);
#endif
	if ((st == 0xFF) || (st & AST_CMD_CHECK)) {
		printk
		    ("aztcd: AST_CMD_CHECK error or no status available\n");
		return -1;
	}

	if (((st & AST_MODE_BITS) != AST_BUSY)
	    && (aztAudioStatus == CDROM_AUDIO_PLAY))
		/* XXX might be an error? look at q-channel? */
		aztAudioStatus = CDROM_AUDIO_COMPLETED;

	if ((st & AST_DSK_CHG) || (st & AST_NOT_READY)) {
		aztDiskChanged = 1;
		aztTocUpToDate = 0;
		aztAudioStatus = CDROM_AUDIO_NO_STATUS;
	}
	return st;
}


/*
 * Send a 'Play' command and get the status.  Use only from the top half.
 */
static int aztPlay(struct azt_Play_msf *arg)
{
	if (sendAztCmd(ACMD_PLAY_AUDIO, arg) < 0)
		RETURNM("aztPlay", -1);
	return 0;
}

/*
 * Subroutines to automatically close the door (tray) and 
 * lock it closed when the cd is mounted.  Leave the tray
 * locking as an option
 */
static void aztCloseDoor(void)
{
	aztSendCmd(ACMD_CLOSE);
	STEN_LOW;
	return;
}

static void aztLockDoor(void)
{
#if AZT_ALLOW_TRAY_LOCK
	aztSendCmd(ACMD_LOCK);
	STEN_LOW;
#endif
	return;
}

static void aztUnlockDoor(void)
{
#if AZT_ALLOW_TRAY_LOCK
	aztSendCmd(ACMD_UNLOCK);
	STEN_LOW;
#endif
	return;
}

/*
 * Read a value from the drive.  Should return quickly, so a busy wait
 * is used to avoid excessive rescheduling. The read command itself must
 * be issued with aztSendCmd() directly before
 */
static int aztGetValue(unsigned char *result)
{
	int s;

	STEN_LOW;
	if (aztTimeOutCount >= AZT_TIMEOUT) {
		printk("aztcd: aztGetValue timeout\n");
		return -1;
	}
	s = inb(DATA_PORT) & 0xFF;
	*result = (unsigned char) s;
	return 0;
}

/*
 * Read the current Q-channel info.  Also used for reading the
 * table of contents.
 */
static int aztGetQChannelInfo(struct azt_Toc *qp)
{
	unsigned char notUsed;
	int st;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztGetQChannelInfo  Time:%li\n", jiffies);
#endif
	if ((st = getAztStatus()) == -1)
		RETURNM("aztGetQChannelInfo 1", -1);
	if (aztSendCmd(ACMD_GET_Q_CHANNEL))
		RETURNM("aztGetQChannelInfo 2", -1);
	/*STEN_LOW_WAIT; ??? Dosemu0.60's cdrom.c does not like STEN_LOW_WAIT here */
	if (aztGetValue(&notUsed))
		RETURNM("aztGetQChannelInfo 3", -1);	/*??? Nullbyte einlesen */
	if ((st & AST_MODE_BITS) == AST_INITIAL) {
		qp->ctrl_addr = 0;	/* when audio stop ACMD_GET_Q_CHANNEL returns */
		qp->track = 0;	/* only one byte with Aztech drives */
		qp->pointIndex = 0;
		qp->trackTime.min = 0;
		qp->trackTime.sec = 0;
		qp->trackTime.frame = 0;
		qp->diskTime.min = 0;
		qp->diskTime.sec = 0;
		qp->diskTime.frame = 0;
		return 0;
	} else {
		if (aztGetValue(&qp->ctrl_addr) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->track) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->pointIndex) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->trackTime.min) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->trackTime.sec) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->trackTime.frame) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&notUsed) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->diskTime.min) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->diskTime.sec) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
		if (aztGetValue(&qp->diskTime.frame) < 0)
			RETURNM("aztGetQChannelInfo 4", -1);
	}
#ifdef AZT_DEBUG
	printk("aztcd: exiting aztGetQChannelInfo  Time:%li\n", jiffies);
#endif
	return 0;
}

/*
 * Read the table of contents (TOC) and TOC header if necessary
 */
static int aztUpdateToc(void)
{
	int st;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztUpdateToc  Time:%li\n", jiffies);
#endif
	if (aztTocUpToDate)
		return 0;

	if (aztGetDiskInfo() < 0)
		return -EIO;

	if (aztGetToc(0) < 0)
		return -EIO;

	/*audio disk detection
	   with my Aztech drive there is no audio status bit, so I use the copy
	   protection bit of the first track. If this track is copy protected 
	   (copy bit = 0), I assume, it's an audio  disk. Strange, but works ??? */
	if (!(Toc[DiskInfo.first].ctrl_addr & 0x40))
		DiskInfo.audio = 1;
	else
		DiskInfo.audio = 0;

	/* XA detection */
	if (!DiskInfo.audio) {
		azt_Play.start.min = 0;	/*XA detection only seems to work */
		azt_Play.start.sec = 2;	/*when we play a track */
		azt_Play.start.frame = 0;
		azt_Play.end.min = 0;
		azt_Play.end.sec = 0;
		azt_Play.end.frame = 1;
		if (sendAztCmd(ACMD_PLAY_READ, &azt_Play))
			return -1;
		DTEN_LOW;
		for (st = 0; st < CD_FRAMESIZE; st++)
			inb(DATA_PORT);
	}
	DiskInfo.xa = getAztStatus() & AST_MODE;
	if (DiskInfo.xa) {
		printk
		    ("aztcd: XA support experimental - mail results to Werner.Zimmermann@fht-esslingen.de\n");
	}

	/*multisession detection
	   support for multisession CDs is done automatically with Aztech drives,
	   we don't have to take care about TOC redirection; if we want the isofs
	   to take care about redirection, we have to set AZT_MULTISESSION to 1 */
	DiskInfo.multi = 0;
#if AZT_MULTISESSION
	if (DiskInfo.xa) {
		aztGetMultiDiskInfo();	/*here Disk.Info.multi is set */
	}
#endif
	if (DiskInfo.multi) {
		DiskInfo.lastSession.min = Toc[DiskInfo.next].diskTime.min;
		DiskInfo.lastSession.sec = Toc[DiskInfo.next].diskTime.sec;
		DiskInfo.lastSession.frame =
		    Toc[DiskInfo.next].diskTime.frame;
		printk("aztcd: Multisession support experimental\n");
	} else {
		DiskInfo.lastSession.min =
		    Toc[DiskInfo.first].diskTime.min;
		DiskInfo.lastSession.sec =
		    Toc[DiskInfo.first].diskTime.sec;
		DiskInfo.lastSession.frame =
		    Toc[DiskInfo.first].diskTime.frame;
	}

	aztTocUpToDate = 1;
#ifdef AZT_DEBUG
	printk("aztcd: exiting aztUpdateToc  Time:%li\n", jiffies);
#endif
	return 0;
}


/* Read the table of contents header, i.e. no. of tracks and start of first 
 * track
 */
static int aztGetDiskInfo(void)
{
	int limit;
	unsigned char test;
	struct azt_Toc qInfo;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztGetDiskInfo  Time:%li\n", jiffies);
#endif
	if (aztSendCmd(ACMD_SEEK_TO_LEADIN))
		RETURNM("aztGetDiskInfo 1", -1);
	STEN_LOW_WAIT;
	test = 0;
	for (limit = 300; limit > 0; limit--) {
		if (aztGetQChannelInfo(&qInfo) < 0)
			RETURNM("aztGetDiskInfo 2", -1);
		if (qInfo.pointIndex == 0xA0) {	/*Number of FirstTrack */
			DiskInfo.first = qInfo.diskTime.min;
			DiskInfo.first = azt_bcd2bin(DiskInfo.first);
			test = test | 0x01;
		}
		if (qInfo.pointIndex == 0xA1) {	/*Number of LastTrack */
			DiskInfo.last = qInfo.diskTime.min;
			DiskInfo.last = azt_bcd2bin(DiskInfo.last);
			test = test | 0x02;
		}
		if (qInfo.pointIndex == 0xA2) {	/*DiskLength */
			DiskInfo.diskLength.min = qInfo.diskTime.min;
			DiskInfo.diskLength.sec = qInfo.diskTime.sec;
			DiskInfo.diskLength.frame = qInfo.diskTime.frame;
			test = test | 0x04;
		}
		if ((qInfo.pointIndex == DiskInfo.first) && (test & 0x01)) {	/*StartTime of First Track */
			DiskInfo.firstTrack.min = qInfo.diskTime.min;
			DiskInfo.firstTrack.sec = qInfo.diskTime.sec;
			DiskInfo.firstTrack.frame = qInfo.diskTime.frame;
			test = test | 0x08;
		}
		if (test == 0x0F)
			break;
	}
#ifdef AZT_DEBUG
	printk("aztcd: exiting aztGetDiskInfo  Time:%li\n", jiffies);
	printk
	    ("Disk Info: first %d last %d length %02X:%02X.%02X dez  first %02X:%02X.%02X dez\n",
	     DiskInfo.first, DiskInfo.last, DiskInfo.diskLength.min,
	     DiskInfo.diskLength.sec, DiskInfo.diskLength.frame,
	     DiskInfo.firstTrack.min, DiskInfo.firstTrack.sec,
	     DiskInfo.firstTrack.frame);
#endif
	if (test != 0x0F)
		return -1;
	return 0;
}

#if AZT_MULTISESSION
/*
 * Get Multisession Disk Info
 */
static int aztGetMultiDiskInfo(void)
{
	int limit, k = 5;
	unsigned char test;
	struct azt_Toc qInfo;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztGetMultiDiskInfo\n");
#endif

	do {
		azt_Play.start.min = Toc[DiskInfo.last + 1].diskTime.min;
		azt_Play.start.sec = Toc[DiskInfo.last + 1].diskTime.sec;
		azt_Play.start.frame =
		    Toc[DiskInfo.last + 1].diskTime.frame;
		test = 0;

		for (limit = 30; limit > 0; limit--) {	/*Seek for LeadIn of next session */
			if (aztSeek(&azt_Play))
				RETURNM("aztGetMultiDiskInfo 1", -1);
			if (aztGetQChannelInfo(&qInfo) < 0)
				RETURNM("aztGetMultiDiskInfo 2", -1);
			if ((qInfo.track == 0) && (qInfo.pointIndex))
				break;	/*LeadIn found */
			if ((azt_Play.start.sec += 10) > 59) {
				azt_Play.start.sec = 0;
				azt_Play.start.min++;
			}
		}
		if (!limit)
			break;	/*Check, if a leadin track was found, if not we're
				   at the end of the disk */
#ifdef AZT_DEBUG_MULTISESSION
		printk("leadin found track %d  pointIndex %x  limit %d\n",
		       qInfo.track, qInfo.pointIndex, limit);
#endif
		for (limit = 300; limit > 0; limit--) {
			if (++azt_Play.start.frame > 74) {
				azt_Play.start.frame = 0;
				if (azt_Play.start.sec > 59) {
					azt_Play.start.sec = 0;
					azt_Play.start.min++;
				}
			}
			if (aztSeek(&azt_Play))
				RETURNM("aztGetMultiDiskInfo 3", -1);
			if (aztGetQChannelInfo(&qInfo) < 0)
				RETURNM("aztGetMultiDiskInfo 4", -1);
			if (qInfo.pointIndex == 0xA0) {	/*Number of NextTrack */
				DiskInfo.next = qInfo.diskTime.min;
				DiskInfo.next = azt_bcd2bin(DiskInfo.next);
				test = test | 0x01;
			}
			if (qInfo.pointIndex == 0xA1) {	/*Number of LastTrack */
				DiskInfo.last = qInfo.diskTime.min;
				DiskInfo.last = azt_bcd2bin(DiskInfo.last);
				test = test | 0x02;
			}
			if (qInfo.pointIndex == 0xA2) {	/*DiskLength */
				DiskInfo.diskLength.min =
				    qInfo.diskTime.min;
				DiskInfo.diskLength.sec =
				    qInfo.diskTime.sec;
				DiskInfo.diskLength.frame =
				    qInfo.diskTime.frame;
				test = test | 0x04;
			}
			if ((qInfo.pointIndex == DiskInfo.next) && (test & 0x01)) {	/*StartTime of Next Track */
				DiskInfo.nextSession.min =
				    qInfo.diskTime.min;
				DiskInfo.nextSession.sec =
				    qInfo.diskTime.sec;
				DiskInfo.nextSession.frame =
				    qInfo.diskTime.frame;
				test = test | 0x08;
			}
			if (test == 0x0F)
				break;
		}
#ifdef AZT_DEBUG_MULTISESSION
		printk
		    ("MultiDisk Info: first %d next %d last %d length %02x:%02x.%02x dez  first %02x:%02x.%02x dez  next %02x:%02x.%02x dez\n",
		     DiskInfo.first, DiskInfo.next, DiskInfo.last,
		     DiskInfo.diskLength.min, DiskInfo.diskLength.sec,
		     DiskInfo.diskLength.frame, DiskInfo.firstTrack.min,
		     DiskInfo.firstTrack.sec, DiskInfo.firstTrack.frame,
		     DiskInfo.nextSession.min, DiskInfo.nextSession.sec,
		     DiskInfo.nextSession.frame);
#endif
		if (test != 0x0F)
			break;
		else
			DiskInfo.multi = 1;	/*found TOC of more than one session */
		aztGetToc(1);
	} while (--k);

#ifdef AZT_DEBUG
	printk("aztcd: exiting aztGetMultiDiskInfo  Time:%li\n", jiffies);
#endif
	return 0;
}
#endif

/*
 * Read the table of contents (TOC)
 */
static int aztGetToc(int multi)
{
	int i, px;
	int limit;
	struct azt_Toc qInfo;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztGetToc  Time:%li\n", jiffies);
#endif
	if (!multi) {
		for (i = 0; i < MAX_TRACKS; i++)
			Toc[i].pointIndex = 0;
		i = DiskInfo.last + 3;
	} else {
		for (i = DiskInfo.next; i < MAX_TRACKS; i++)
			Toc[i].pointIndex = 0;
		i = DiskInfo.last + 4 - DiskInfo.next;
	}

/*Is there a good reason to stop motor before TOC read?
  if (aztSendCmd(ACMD_STOP)) RETURNM("aztGetToc 1",-1);
      STEN_LOW_WAIT;
*/

	if (!multi) {
		azt_mode = 0x05;
		if (aztSendCmd(ACMD_SEEK_TO_LEADIN))
			RETURNM("aztGetToc 2", -1);
		STEN_LOW_WAIT;
	}
	for (limit = 300; limit > 0; limit--) {
		if (multi) {
			if (++azt_Play.start.sec > 59) {
				azt_Play.start.sec = 0;
				azt_Play.start.min++;
			}
			if (aztSeek(&azt_Play))
				RETURNM("aztGetToc 3", -1);
		}
		if (aztGetQChannelInfo(&qInfo) < 0)
			break;

		px = azt_bcd2bin(qInfo.pointIndex);

		if (px > 0 && px < MAX_TRACKS && qInfo.track == 0)
			if (Toc[px].pointIndex == 0) {
				Toc[px] = qInfo;
				i--;
			}

		if (i <= 0)
			break;
	}

	Toc[DiskInfo.last + 1].diskTime = DiskInfo.diskLength;
	Toc[DiskInfo.last].trackTime = DiskInfo.diskLength;

#ifdef AZT_DEBUG_MULTISESSION
	printk("aztcd: exiting aztGetToc\n");
	for (i = 1; i <= DiskInfo.last + 1; i++)
		printk
		    ("i = %2d ctl-adr = %02X track %2d px %02X %02X:%02X.%02X dez  %02X:%02X.%02X dez\n",
		     i, Toc[i].ctrl_addr, Toc[i].track, Toc[i].pointIndex,
		     Toc[i].trackTime.min, Toc[i].trackTime.sec,
		     Toc[i].trackTime.frame, Toc[i].diskTime.min,
		     Toc[i].diskTime.sec, Toc[i].diskTime.frame);
	for (i = 100; i < 103; i++)
		printk
		    ("i = %2d ctl-adr = %02X track %2d px %02X %02X:%02X.%02X dez  %02X:%02X.%02X dez\n",
		     i, Toc[i].ctrl_addr, Toc[i].track, Toc[i].pointIndex,
		     Toc[i].trackTime.min, Toc[i].trackTime.sec,
		     Toc[i].trackTime.frame, Toc[i].diskTime.min,
		     Toc[i].diskTime.sec, Toc[i].diskTime.frame);
#endif

	return limit > 0 ? 0 : -1;
}


/*##########################################################################
  Kernel Interface Functions
  ##########################################################################
*/

#ifndef MODULE
static int __init aztcd_setup(char *str)
{
	int ints[4];

	(void) get_options(str, ARRAY_SIZE(ints), ints);

	if (ints[0] > 0)
		azt_port = ints[1];
	if (ints[1] > 1)
		azt_cont = ints[2];
	return 1;
}

__setup("aztcd=", aztcd_setup);

#endif				/* !MODULE */

/* 
 * Checking if the media has been changed
*/
static int check_aztcd_media_change(struct gendisk *disk)
{
	if (aztDiskChanged) {	/* disk changed */
		aztDiskChanged = 0;
		return 1;
	} else
		return 0;	/* no change */
}

/*
 * Kernel IO-controls
*/
static int aztcd_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
		       unsigned long arg)
{
	int i;
	struct azt_Toc qInfo;
	struct cdrom_ti ti;
	struct cdrom_tochdr tocHdr;
	struct cdrom_msf msf;
	struct cdrom_tocentry entry;
	struct azt_Toc *tocPtr;
	struct cdrom_subchnl subchnl;
	struct cdrom_volctrl volctrl;
	void __user *argp = (void __user *)arg;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztcd_ioctl - Command:%x   Time: %li\n",
	       cmd, jiffies);
	printk("aztcd Status %x\n", getAztStatus());
#endif
	if (!ip)
		RETURNM("aztcd_ioctl 1", -EINVAL);
	if (getAztStatus() < 0)
		RETURNM("aztcd_ioctl 2", -EIO);
	if ((!aztTocUpToDate) || (aztDiskChanged)) {
		if ((i = aztUpdateToc()) < 0)
			RETURNM("aztcd_ioctl 3", i);	/* error reading TOC */
	}

	switch (cmd) {
	case CDROMSTART:	/* Spin up the drive. Don't know, what to do,
				   at least close the tray */
#if AZT_PRIVATE_IOCTLS
		if (aztSendCmd(ACMD_CLOSE))
			RETURNM("aztcd_ioctl 4", -1);
		STEN_LOW_WAIT;
#endif
		break;
	case CDROMSTOP:	/* Spin down the drive */
		if (aztSendCmd(ACMD_STOP))
			RETURNM("aztcd_ioctl 5", -1);
		STEN_LOW_WAIT;
		/* should we do anything if it fails? */
		aztAudioStatus = CDROM_AUDIO_NO_STATUS;
		break;
	case CDROMPAUSE:	/* Pause the drive */
		if (aztAudioStatus != CDROM_AUDIO_PLAY)
			return -EINVAL;

		if (aztGetQChannelInfo(&qInfo) < 0) {	/* didn't get q channel info */
			aztAudioStatus = CDROM_AUDIO_NO_STATUS;
			RETURNM("aztcd_ioctl 7", 0);
		}
		azt_Play.start = qInfo.diskTime;	/* remember restart point */

		if (aztSendCmd(ACMD_PAUSE))
			RETURNM("aztcd_ioctl 8", -1);
		STEN_LOW_WAIT;
		aztAudioStatus = CDROM_AUDIO_PAUSED;
		break;
	case CDROMRESUME:	/* Play it again, Sam */
		if (aztAudioStatus != CDROM_AUDIO_PAUSED)
			return -EINVAL;
		/* restart the drive at the saved position. */
		i = aztPlay(&azt_Play);
		if (i < 0) {
			aztAudioStatus = CDROM_AUDIO_ERROR;
			return -EIO;
		}
		aztAudioStatus = CDROM_AUDIO_PLAY;
		break;
	case CDROMMULTISESSION:	/*multisession support -- experimental */
		{
			struct cdrom_multisession ms;
#ifdef AZT_DEBUG
			printk("aztcd ioctl MULTISESSION\n");
#endif
			if (copy_from_user(&ms, argp,
			     sizeof(struct cdrom_multisession)))
				return -EFAULT;
			if (ms.addr_format == CDROM_MSF) {
				ms.addr.msf.minute =
				    azt_bcd2bin(DiskInfo.lastSession.min);
				ms.addr.msf.second =
				    azt_bcd2bin(DiskInfo.lastSession.sec);
				ms.addr.msf.frame =
				    azt_bcd2bin(DiskInfo.lastSession.
						frame);
			} else if (ms.addr_format == CDROM_LBA)
				ms.addr.lba =
				    azt_msf2hsg(&DiskInfo.lastSession);
			else
				return -EINVAL;
			ms.xa_flag = DiskInfo.xa;
			if (copy_to_user(argp, &ms,
			     sizeof(struct cdrom_multisession)))
				return -EFAULT;
#ifdef AZT_DEBUG
			if (ms.addr_format == CDROM_MSF)
				printk
				    ("aztcd multisession xa:%d, msf:%02x:%02x.%02x [%02x:%02x.%02x])\n",
				     ms.xa_flag, ms.addr.msf.minute,
				     ms.addr.msf.second, ms.addr.msf.frame,
				     DiskInfo.lastSession.min,
				     DiskInfo.lastSession.sec,
				     DiskInfo.lastSession.frame);
			else
				printk
				    ("aztcd multisession %d, lba:0x%08x [%02x:%02x.%02x])\n",
				     ms.xa_flag, ms.addr.lba,
				     DiskInfo.lastSession.min,
				     DiskInfo.lastSession.sec,
				     DiskInfo.lastSession.frame);
#endif
			return 0;
		}
	case CDROMPLAYTRKIND:	/* Play a track.  This currently ignores index. */
		if (copy_from_user(&ti, argp, sizeof ti))
			return -EFAULT;
		if (ti.cdti_trk0 < DiskInfo.first
		    || ti.cdti_trk0 > DiskInfo.last
		    || ti.cdti_trk1 < ti.cdti_trk0) {
			return -EINVAL;
		}
		if (ti.cdti_trk1 > DiskInfo.last)
			ti.cdti_trk1 = DiskInfo.last;
		azt_Play.start = Toc[ti.cdti_trk0].diskTime;
		azt_Play.end = Toc[ti.cdti_trk1 + 1].diskTime;
#ifdef AZT_DEBUG
		printk("aztcd play: %02x:%02x.%02x to %02x:%02x.%02x\n",
		       azt_Play.start.min, azt_Play.start.sec,
		       azt_Play.start.frame, azt_Play.end.min,
		       azt_Play.end.sec, azt_Play.end.frame);
#endif
		i = aztPlay(&azt_Play);
		if (i < 0) {
			aztAudioStatus = CDROM_AUDIO_ERROR;
			return -EIO;
		}
		aztAudioStatus = CDROM_AUDIO_PLAY;
		break;
	case CDROMPLAYMSF:	/* Play starting at the given MSF address. */
/*              if (aztAudioStatus == CDROM_AUDIO_PLAY) 
		{ if (aztSendCmd(ACMD_STOP)) RETURNM("aztcd_ioctl 9",-1);
		  STEN_LOW;
		  aztAudioStatus = CDROM_AUDIO_NO_STATUS;
		}
*/
		if (copy_from_user(&msf, argp, sizeof msf))
			return -EFAULT;
		/* convert to bcd */
		azt_bin2bcd(&msf.cdmsf_min0);
		azt_bin2bcd(&msf.cdmsf_sec0);
		azt_bin2bcd(&msf.cdmsf_frame0);
		azt_bin2bcd(&msf.cdmsf_min1);
		azt_bin2bcd(&msf.cdmsf_sec1);
		azt_bin2bcd(&msf.cdmsf_frame1);
		azt_Play.start.min = msf.cdmsf_min0;
		azt_Play.start.sec = msf.cdmsf_sec0;
		azt_Play.start.frame = msf.cdmsf_frame0;
		azt_Play.end.min = msf.cdmsf_min1;
		azt_Play.end.sec = msf.cdmsf_sec1;
		azt_Play.end.frame = msf.cdmsf_frame1;
#ifdef AZT_DEBUG
		printk("aztcd play: %02x:%02x.%02x to %02x:%02x.%02x\n",
		       azt_Play.start.min, azt_Play.start.sec,
		       azt_Play.start.frame, azt_Play.end.min,
		       azt_Play.end.sec, azt_Play.end.frame);
#endif
		i = aztPlay(&azt_Play);
		if (i < 0) {
			aztAudioStatus = CDROM_AUDIO_ERROR;
			return -EIO;
		}
		aztAudioStatus = CDROM_AUDIO_PLAY;
		break;

	case CDROMREADTOCHDR:	/* Read the table of contents header */
		tocHdr.cdth_trk0 = DiskInfo.first;
		tocHdr.cdth_trk1 = DiskInfo.last;
		if (copy_to_user(argp, &tocHdr, sizeof tocHdr))
			return -EFAULT;
		break;
	case CDROMREADTOCENTRY:	/* Read an entry in the table of contents */
		if (copy_from_user(&entry, argp, sizeof entry))
			return -EFAULT;
		if ((!aztTocUpToDate) || aztDiskChanged)
			aztUpdateToc();
		if (entry.cdte_track == CDROM_LEADOUT)
			tocPtr = &Toc[DiskInfo.last + 1];
		else if (entry.cdte_track > DiskInfo.last
			 || entry.cdte_track < DiskInfo.first) {
			return -EINVAL;
		} else
			tocPtr = &Toc[entry.cdte_track];
		entry.cdte_adr = tocPtr->ctrl_addr;
		entry.cdte_ctrl = tocPtr->ctrl_addr >> 4;
		if (entry.cdte_format == CDROM_LBA)
			entry.cdte_addr.lba =
			    azt_msf2hsg(&tocPtr->diskTime);
		else if (entry.cdte_format == CDROM_MSF) {
			entry.cdte_addr.msf.minute =
			    azt_bcd2bin(tocPtr->diskTime.min);
			entry.cdte_addr.msf.second =
			    azt_bcd2bin(tocPtr->diskTime.sec);
			entry.cdte_addr.msf.frame =
			    azt_bcd2bin(tocPtr->diskTime.frame);
		} else {
			return -EINVAL;
		}
		if (copy_to_user(argp, &entry, sizeof entry))
			return -EFAULT;
		break;
	case CDROMSUBCHNL:	/* Get subchannel info */
		if (copy_from_user
		    (&subchnl, argp, sizeof(struct cdrom_subchnl)))
			return -EFAULT;
		if (aztGetQChannelInfo(&qInfo) < 0) {
#ifdef AZT_DEBUG
			printk
			    ("aztcd: exiting aztcd_ioctl - Error 3 - Command:%x\n",
			     cmd);
#endif
			return -EIO;
		}
		subchnl.cdsc_audiostatus = aztAudioStatus;
		subchnl.cdsc_adr = qInfo.ctrl_addr;
		subchnl.cdsc_ctrl = qInfo.ctrl_addr >> 4;
		subchnl.cdsc_trk = azt_bcd2bin(qInfo.track);
		subchnl.cdsc_ind = azt_bcd2bin(qInfo.pointIndex);
		if (subchnl.cdsc_format == CDROM_LBA) {
			subchnl.cdsc_absaddr.lba =
			    azt_msf2hsg(&qInfo.diskTime);
			subchnl.cdsc_reladdr.lba =
			    azt_msf2hsg(&qInfo.trackTime);
		} else {	/*default */
			subchnl.cdsc_format = CDROM_MSF;
			subchnl.cdsc_absaddr.msf.minute =
			    azt_bcd2bin(qInfo.diskTime.min);
			subchnl.cdsc_absaddr.msf.second =
			    azt_bcd2bin(qInfo.diskTime.sec);
			subchnl.cdsc_absaddr.msf.frame =
			    azt_bcd2bin(qInfo.diskTime.frame);
			subchnl.cdsc_reladdr.msf.minute =
			    azt_bcd2bin(qInfo.trackTime.min);
			subchnl.cdsc_reladdr.msf.second =
			    azt_bcd2bin(qInfo.trackTime.sec);
			subchnl.cdsc_reladdr.msf.frame =
			    azt_bcd2bin(qInfo.trackTime.frame);
		}
		if (copy_to_user(argp, &subchnl, sizeof(struct cdrom_subchnl)))
			return -EFAULT;
		break;
	case CDROMVOLCTRL:	/* Volume control 
				   * With my Aztech CD268-01A volume control does not work, I can only
				   turn the channels on (any value !=0) or off (value==0). Maybe it
				   works better with your drive */
		if (copy_from_user(&volctrl, argp, sizeof(volctrl)))
			return -EFAULT;
		azt_Play.start.min = 0x21;
		azt_Play.start.sec = 0x84;
		azt_Play.start.frame = volctrl.channel0;
		azt_Play.end.min = volctrl.channel1;
		azt_Play.end.sec = volctrl.channel2;
		azt_Play.end.frame = volctrl.channel3;
		sendAztCmd(ACMD_SET_VOLUME, &azt_Play);
		STEN_LOW_WAIT;
		break;
	case CDROMEJECT:
		aztUnlockDoor();	/* Assume user knows what they're doing */
		/* all drives can at least stop! */
		if (aztAudioStatus == CDROM_AUDIO_PLAY) {
			if (aztSendCmd(ACMD_STOP))
				RETURNM("azt_ioctl 10", -1);
			STEN_LOW_WAIT;
		}
		if (aztSendCmd(ACMD_EJECT))
			RETURNM("azt_ioctl 11", -1);
		STEN_LOW_WAIT;
		aztAudioStatus = CDROM_AUDIO_NO_STATUS;
		break;
	case CDROMEJECT_SW:
		azt_auto_eject = (char) arg;
		break;
	case CDROMRESET:
		outb(ACMD_SOFT_RESET, CMD_PORT);	/*send reset */
		STEN_LOW;
		if (inb(DATA_PORT) != AFL_OP_OK) {	/*OP_OK? */
			printk
			    ("aztcd: AZTECH CD-ROM drive does not respond\n");
		}
		break;
/*Take care, the following code is not compatible with other CD-ROM drivers,
  use it at your own risk with cdplay.c. Set AZT_PRIVATE_IOCTLS to 0 in aztcd.h,
  if you do not want to use it!
*/
#if AZT_PRIVATE_IOCTLS
	case CDROMREADCOOKED:	/*read data in mode 1 (2048 Bytes) */
	case CDROMREADRAW:	/*read data in mode 2 (2336 Bytes) */
		{
			if (copy_from_user(&msf, argp, sizeof msf))
				return -EFAULT;
			/* convert to bcd */
			azt_bin2bcd(&msf.cdmsf_min0);
			azt_bin2bcd(&msf.cdmsf_sec0);
			azt_bin2bcd(&msf.cdmsf_frame0);
			msf.cdmsf_min1 = 0;
			msf.cdmsf_sec1 = 0;
			msf.cdmsf_frame1 = 1;	/*read only one frame */
			azt_Play.start.min = msf.cdmsf_min0;
			azt_Play.start.sec = msf.cdmsf_sec0;
			azt_Play.start.frame = msf.cdmsf_frame0;
			azt_Play.end.min = msf.cdmsf_min1;
			azt_Play.end.sec = msf.cdmsf_sec1;
			azt_Play.end.frame = msf.cdmsf_frame1;
			if (cmd == CDROMREADRAW) {
				if (DiskInfo.xa) {
					return -1;	/*XA Disks can't be read raw */
				} else {
					if (sendAztCmd(ACMD_PLAY_READ_RAW, &azt_Play))
						return -1;
					DTEN_LOW;
					insb(DATA_PORT, buf, CD_FRAMESIZE_RAW);
					if (copy_to_user(argp, &buf, CD_FRAMESIZE_RAW))
						return -EFAULT;
				}
			} else
				/*CDROMREADCOOKED*/ {
				if (sendAztCmd(ACMD_PLAY_READ, &azt_Play))
					return -1;
				DTEN_LOW;
				insb(DATA_PORT, buf, CD_FRAMESIZE);
				if (copy_to_user(argp, &buf, CD_FRAMESIZE))
					return -EFAULT;
				}
		}
		break;
	case CDROMSEEK:	/*seek msf address */
		if (copy_from_user(&msf, argp, sizeof msf))
			return -EFAULT;
		/* convert to bcd */
		azt_bin2bcd(&msf.cdmsf_min0);
		azt_bin2bcd(&msf.cdmsf_sec0);
		azt_bin2bcd(&msf.cdmsf_frame0);
		azt_Play.start.min = msf.cdmsf_min0;
		azt_Play.start.sec = msf.cdmsf_sec0;
		azt_Play.start.frame = msf.cdmsf_frame0;
		if (aztSeek(&azt_Play))
			return -1;
		break;
#endif				/*end of incompatible code */
	case CDROMREADMODE1:	/*set read data in mode 1 */
		return aztSetDiskType(AZT_MODE_1);
	case CDROMREADMODE2:	/*set read data in mode 2 */
		return aztSetDiskType(AZT_MODE_2);
	default:
		return -EINVAL;
	}
#ifdef AZT_DEBUG
	printk("aztcd: exiting aztcd_ioctl Command:%x  Time:%li\n", cmd,
	       jiffies);
#endif
	return 0;
}

/*
 * Take care of the different block sizes between cdrom and Linux.
 * When Linux gets variable block sizes this will probably go away.
 */
static void azt_transfer(void)
{
#ifdef AZT_TEST
	printk("aztcd: executing azt_transfer Time:%li\n", jiffies);
#endif
	if (!current_valid())
	        return;

	while (CURRENT->nr_sectors) {
		int bn = CURRENT->sector / 4;
		int i;
		for (i = 0; i < AZT_BUF_SIZ && azt_buf_bn[i] != bn; ++i);
		if (i < AZT_BUF_SIZ) {
			int offs = (i * 4 + (CURRENT->sector & 3)) * 512;
			int nr_sectors = 4 - (CURRENT->sector & 3);
			if (azt_buf_out != i) {
				azt_buf_out = i;
				if (azt_buf_bn[i] != bn) {
					azt_buf_out = -1;
					continue;
				}
			}
			if (nr_sectors > CURRENT->nr_sectors)
			    nr_sectors = CURRENT->nr_sectors;
			memcpy(CURRENT->buffer, azt_buf + offs,
				nr_sectors * 512);
			CURRENT->nr_sectors -= nr_sectors;
			CURRENT->sector += nr_sectors;
			CURRENT->buffer += nr_sectors * 512;
		} else {
			azt_buf_out = -1;
			break;
		}
	}
}

static void do_aztcd_request(request_queue_t * q)
{
#ifdef AZT_TEST
	printk(" do_aztcd_request(%ld+%ld) Time:%li\n", CURRENT->sector,
	       CURRENT->nr_sectors, jiffies);
#endif
	if (DiskInfo.audio) {
		printk("aztcd: Error, tried to mount an Audio CD\n");
		end_request(CURRENT, 0);
		return;
	}
	azt_transfer_is_active = 1;
	while (current_valid()) {
		azt_transfer();
		if (CURRENT->nr_sectors == 0) {
			end_request(CURRENT, 1);
		} else {
			azt_buf_out = -1;	/* Want to read a block not in buffer */
			if (azt_state == AZT_S_IDLE) {
				if ((!aztTocUpToDate) || aztDiskChanged) {
					if (aztUpdateToc() < 0) {
						while (current_valid())
							end_request(CURRENT, 0);
						break;
					}
				}
				azt_state = AZT_S_START;
				AztTries = 5;
				SET_TIMER(azt_poll, HZ / 100);
			}
			break;
		}
	}
	azt_transfer_is_active = 0;
#ifdef AZT_TEST2
	printk
	    ("azt_next_bn:%x  azt_buf_in:%x azt_buf_out:%x  azt_buf_bn:%x\n",
	     azt_next_bn, azt_buf_in, azt_buf_out, azt_buf_bn[azt_buf_in]);
	printk(" do_aztcd_request ends  Time:%li\n", jiffies);
#endif
}


static void azt_invalidate_buffers(void)
{
	int i;

#ifdef AZT_DEBUG
	printk("aztcd: executing azt_invalidate_buffers\n");
#endif
	for (i = 0; i < AZT_BUF_SIZ; ++i)
		azt_buf_bn[i] = -1;
	azt_buf_out = -1;
}

/*
 * Open the device special file.  Check that a disk is in.
 */
static int aztcd_open(struct inode *ip, struct file *fp)
{
	int st;

#ifdef AZT_DEBUG
	printk("aztcd: starting aztcd_open\n");
#endif

	if (aztPresent == 0)
		return -ENXIO;	/* no hardware */

	if (!azt_open_count && azt_state == AZT_S_IDLE) {
		azt_invalidate_buffers();

		st = getAztStatus();	/* check drive status */
		if (st == -1)
			goto err_out;	/* drive doesn't respond */

		if (st & AST_DOOR_OPEN) {	/* close door, then get the status again. */
			printk("aztcd: Door Open?\n");
			aztCloseDoor();
			st = getAztStatus();
		}

		if ((st & AST_NOT_READY) || (st & AST_DSK_CHG)) {	/*no disk in drive or changed */
			printk
			    ("aztcd: Disk Changed or No Disk in Drive?\n");
			aztTocUpToDate = 0;
		}
		if (aztUpdateToc())
			goto err_out;

	}
	++azt_open_count;
	aztLockDoor();

#ifdef AZT_DEBUG
	printk("aztcd: exiting aztcd_open\n");
#endif
	return 0;

      err_out:
	return -EIO;
}


/*
 * On close, we flush all azt blocks from the buffer cache.
 */
static int aztcd_release(struct inode *inode, struct file *file)
{
#ifdef AZT_DEBUG
	printk("aztcd: executing aztcd_release\n");
	printk("inode: %p, device: %s    file: %p\n", inode,
	       inode->i_bdev->bd_disk->disk_name, file);
#endif
	if (!--azt_open_count) {
		azt_invalidate_buffers();
		aztUnlockDoor();
		if (azt_auto_eject)
			aztSendCmd(ACMD_EJECT);
		CLEAR_TIMER;
	}
	return 0;
}

static struct gendisk *azt_disk;

/*
 * Test for presence of drive and initialize it.  Called at boot time.
 */

static int __init aztcd_init(void)
{
	long int count, max_count;
	unsigned char result[50];
	int st;
	void* status = NULL;
	int i = 0;
	int ret = 0;

	if (azt_port == 0) {
		printk(KERN_INFO "aztcd: no Aztech CD-ROM Initialization");
		return -EIO;
	}

	printk(KERN_INFO "aztcd: AZTECH, ORCHID, OKANO, WEARNES, TXC, CyDROM "
	       "CD-ROM Driver\n");
	printk(KERN_INFO "aztcd: (C) 1994-98 W.Zimmermann\n");
	if (azt_port == -1) {
		printk
		    ("aztcd: DriverVersion=%s For IDE/ATAPI-drives use ide-cd.c\n",
		     AZT_VERSION);
	} else
		printk
		    ("aztcd: DriverVersion=%s BaseAddress=0x%x  For IDE/ATAPI-drives use ide-cd.c\n",
		     AZT_VERSION, azt_port);
	printk(KERN_INFO "aztcd: If you have problems, read /usr/src/linux/"
	       "Documentation/cdrom/aztcd\n");


#ifdef AZT_SW32			/*CDROM connected to Soundwave32 card */
	if ((0xFF00 & inw(AZT_SW32_ID_REG)) != 0x4500) {
		printk
		    ("aztcd: no Soundwave32 card detected at base:%x init:%x config:%x id:%x\n",
		     AZT_SW32_BASE_ADDR, AZT_SW32_INIT,
		     AZT_SW32_CONFIG_REG, AZT_SW32_ID_REG);
		return -EIO;
	} else {
		printk(KERN_INFO
		       "aztcd: Soundwave32 card detected at %x  Version %x\n",
		       AZT_SW32_BASE_ADDR, inw(AZT_SW32_ID_REG));
		outw(AZT_SW32_INIT, AZT_SW32_CONFIG_REG);
		for (count = 0; count < 10000; count++);	/*delay a bit */
	}
#endif

	/* check for presence of drive */

	if (azt_port == -1) {	/* autoprobing for proprietary interface  */
		for (i = 0; (azt_port_auto[i] != 0) && (i < 16); i++) {
			azt_port = azt_port_auto[i];
			printk(KERN_INFO "aztcd: Autoprobing BaseAddress=0x%x"
			       "\n", azt_port);
			 /*proprietary interfaces need 4 bytes */
			if (!request_region(azt_port, 4, "aztcd")) {
				continue;
			}
			outb(POLLED, MODE_PORT);
			inb(CMD_PORT);
			inb(CMD_PORT);
			outb(ACMD_GET_VERSION, CMD_PORT);	/*Try to get version info */

			aztTimeOutCount = 0;
			do {
				aztIndatum = inb(STATUS_PORT);
				aztTimeOutCount++;
				if (aztTimeOutCount >= AZT_FAST_TIMEOUT)
					break;
			} while (aztIndatum & AFL_STATUS);
			if (inb(DATA_PORT) == AFL_OP_OK) { /* OK drive found */
				break;
			}
			else {  /* Drive not found on this port - try next one */
				release_region(azt_port, 4);
			}
		}
		if ((i == 16) || (azt_port_auto[i] == 0)) {
			printk(KERN_INFO "aztcd: no AZTECH CD-ROM drive found\n");
			return -EIO;
		}
	} else {		/* no autoprobing */
		if ((azt_port == 0x1f0) || (azt_port == 0x170))
			status = request_region(azt_port, 8, "aztcd");	/*IDE-interfaces need 8 bytes */
		else
			status = request_region(azt_port, 4, "aztcd");	/*proprietary interfaces need 4 bytes */
		if (!status) {
			printk(KERN_WARNING "aztcd: conflict, I/O port (%X) "
			       "already used\n", azt_port);
			return -EIO;
		}

		if ((azt_port == 0x1f0) || (azt_port == 0x170))
			SWITCH_IDE_SLAVE;	/*switch IDE interface to slave configuration */

		outb(POLLED, MODE_PORT);
		inb(CMD_PORT);
		inb(CMD_PORT);
		outb(ACMD_GET_VERSION, CMD_PORT);	/*Try to get version info */

		aztTimeOutCount = 0;
		do {
			aztIndatum = inb(STATUS_PORT);
			aztTimeOutCount++;
			if (aztTimeOutCount >= AZT_FAST_TIMEOUT)
				break;
		} while (aztIndatum & AFL_STATUS);

		if (inb(DATA_PORT) != AFL_OP_OK) {	/*OP_OK? If not, reset and try again */
#ifndef MODULE
			if (azt_cont != 0x79) {
				printk(KERN_WARNING "aztcd: no AZTECH CD-ROM "
				       "drive found-Try boot parameter aztcd="
				       "<BaseAddress>,0x79\n");
				ret = -EIO;
				goto err_out;
			}
#else
			if (0) {
			}
#endif
			else {
				printk(KERN_INFO "aztcd: drive reset - "
				       "please wait\n");
				for (count = 0; count < 50; count++) {
					inb(STATUS_PORT);	/*removing all data from earlier tries */
					inb(DATA_PORT);
				}
				outb(POLLED, MODE_PORT);
				inb(CMD_PORT);
				inb(CMD_PORT);
				getAztStatus();	/*trap errors */
				outb(ACMD_SOFT_RESET, CMD_PORT);	/*send reset */
				STEN_LOW;
				if (inb(DATA_PORT) != AFL_OP_OK) {	/*OP_OK? */
					printk(KERN_WARNING "aztcd: no AZTECH "
					       "CD-ROM drive found\n");
					ret = -EIO;
					goto err_out;
				}

				for (count = 0; count < AZT_TIMEOUT;
				     count++)
					barrier();	/* Stop gcc 2.96 being smart */
				/* use udelay(), damnit -- AV */

				if ((st = getAztStatus()) == -1) {
					printk(KERN_WARNING "aztcd: Drive Status"
					       " Error Status=%x\n", st);
					ret = -EIO;
					goto err_out;
				}
#ifdef AZT_DEBUG
				printk(KERN_DEBUG "aztcd: Status = %x\n", st);
#endif
				outb(POLLED, MODE_PORT);
				inb(CMD_PORT);
				inb(CMD_PORT);
				outb(ACMD_GET_VERSION, CMD_PORT);	/*GetVersion */
				STEN_LOW;
				OP_OK;
			}
		}
	}

	azt_init_end = 1;
	STEN_LOW;
	result[0] = inb(DATA_PORT);	/*reading in a null byte??? */
	for (count = 1; count < 50; count++) {	/*Reading version string */
		aztTimeOutCount = 0;	/*here we must implement STEN_LOW differently */
		do {
			aztIndatum = inb(STATUS_PORT);	/*because we want to exit by timeout */
			aztTimeOutCount++;
			if (aztTimeOutCount >= AZT_FAST_TIMEOUT)
				break;
		} while (aztIndatum & AFL_STATUS);
		if (aztTimeOutCount >= AZT_FAST_TIMEOUT)
			break;	/*all chars read? */
		result[count] = inb(DATA_PORT);
	}
	if (count > 30)
		max_count = 30;	/*print max.30 chars of the version string */
	else
		max_count = count;
	printk(KERN_INFO "aztcd: FirmwareVersion=");
	for (count = 1; count < max_count; count++)
		printk("%c", result[count]);
	printk("<<>> ");

	if ((result[1] == 'A') && (result[2] == 'Z') && (result[3] == 'T')) {
		printk("AZTECH drive detected\n");
	/*AZTECH*/}
		else if ((result[2] == 'C') && (result[3] == 'D')
			 && (result[4] == 'D')) {
		printk("ORCHID or WEARNES drive detected\n");	/*ORCHID or WEARNES */
	} else if ((result[1] == 0x03) && (result[2] == '5')) {
		printk("TXC or CyCDROM drive detected\n");	/*Conrad TXC, CyCDROM */
	} else {		/*OTHERS or none */
		printk("\nunknown drive or firmware version detected\n");
		printk
		    ("aztcd may not run stable, if you want to try anyhow,\n");
		printk("boot with: aztcd=<BaseAddress>,0x79\n");
		if ((azt_cont != 0x79)) {
			printk("aztcd: FirmwareVersion=");
			for (count = 1; count < 5; count++)
				printk("%c", result[count]);
			printk("<<>> ");
			printk("Aborted\n");
			ret = -EIO;
			goto err_out;
		}
	}
	azt_disk = alloc_disk(1);
	if (!azt_disk)
		goto err_out;

	if (register_blkdev(MAJOR_NR, "aztcd")) {
		ret = -EIO;
		goto err_out2;
	}

	azt_queue = blk_init_queue(do_aztcd_request, &aztSpin);
	if (!azt_queue) {
		ret = -ENOMEM;
		goto err_out3;
	}

	blk_queue_hardsect_size(azt_queue, 2048);
	azt_disk->major = MAJOR_NR;
	azt_disk->first_minor = 0;
	azt_disk->fops = &azt_fops;
	sprintf(azt_disk->disk_name, "aztcd");
	azt_disk->queue = azt_queue;
	add_disk(azt_disk);
	azt_invalidate_buffers();
	aztPresent = 1;
	aztCloseDoor();
	return 0;
err_out3:
	unregister_blkdev(MAJOR_NR, "aztcd");
err_out2:
	put_disk(azt_disk);
err_out:
	if ((azt_port == 0x1f0) || (azt_port == 0x170)) {
		SWITCH_IDE_MASTER;
		release_region(azt_port, 8);	/*IDE-interface */
	} else
		release_region(azt_port, 4);	/*proprietary interface */
	return ret;

}

static void __exit aztcd_exit(void)
{
	del_gendisk(azt_disk);
	put_disk(azt_disk);
	if ((unregister_blkdev(MAJOR_NR, "aztcd") == -EINVAL)) {
		printk("What's that: can't unregister aztcd\n");
		return;
	}
	blk_cleanup_queue(azt_queue);
	if ((azt_port == 0x1f0) || (azt_port == 0x170)) {
		SWITCH_IDE_MASTER;
		release_region(azt_port, 8);	/*IDE-interface */
	} else
		release_region(azt_port, 4);	/*proprietary interface */
	printk(KERN_INFO "aztcd module released.\n");
}

module_init(aztcd_init);
module_exit(aztcd_exit);

/*##########################################################################
  Aztcd State Machine: Controls Drive Operating State
  ##########################################################################
*/
static void azt_poll(void)
{
	int st = 0;
	int loop_ctl = 1;
	int skip = 0;

	if (azt_error) {
		if (aztSendCmd(ACMD_GET_ERROR))
			RETURN("azt_poll 1");
		STEN_LOW;
		azt_error = inb(DATA_PORT) & 0xFF;
		printk("aztcd: I/O error 0x%02x\n", azt_error);
		azt_invalidate_buffers();
#ifdef WARN_IF_READ_FAILURE
		if (AztTries == 5)
			printk
			    ("aztcd: Read of Block %d Failed - Maybe Audio Disk?\n",
			     azt_next_bn);
#endif
		if (!AztTries--) {
			printk
			    ("aztcd: Read of Block %d Failed, Maybe Audio Disk? Giving up\n",
			     azt_next_bn);
			if (azt_transfer_is_active) {
				AztTries = 0;
				loop_ctl = 0;
			}
			if (current_valid())
				end_request(CURRENT, 0);
			AztTries = 5;
		}
		azt_error = 0;
		azt_state = AZT_S_STOP;
	}

	while (loop_ctl) {
		loop_ctl = 0;	/* each case must flip this back to 1 if we want
				   to come back up here */
		switch (azt_state) {

		case AZT_S_IDLE:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_IDLE\n");
			}
#endif
			return;

		case AZT_S_START:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_START\n");
			}
#endif
			if (aztSendCmd(ACMD_GET_STATUS))
				RETURN("azt_poll 2");	/*result will be checked by aztStatus() */
			azt_state =
			    azt_mode == 1 ? AZT_S_READ : AZT_S_MODE;
			AztTimeout = 3000;
			break;

		case AZT_S_MODE:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_MODE\n");
			}
#endif
			if (!skip) {
				if ((st = aztStatus()) != -1) {
					if ((st & AST_DSK_CHG)
					    || (st & AST_NOT_READY)) {
						aztDiskChanged = 1;
						aztTocUpToDate = 0;
						azt_invalidate_buffers();
						end_request(CURRENT, 0);
						printk
						    ("aztcd: Disk Changed or Not Ready 1 - Unmount Disk!\n");
					}
				} else
					break;
			}
			skip = 0;

			if ((st & AST_DOOR_OPEN) || (st & AST_NOT_READY)) {
				aztDiskChanged = 1;
				aztTocUpToDate = 0;
				printk
				    ("aztcd: Disk Changed or Not Ready 2 - Unmount Disk!\n");
				end_request(CURRENT, 0);
				printk((st & AST_DOOR_OPEN) ?
				       "aztcd: door open\n" :
				       "aztcd: disk removed\n");
				if (azt_transfer_is_active) {
					azt_state = AZT_S_START;
					loop_ctl = 1;	/* goto immediately */
					break;
				}
				azt_state = AZT_S_IDLE;
				while (current_valid())
					end_request(CURRENT, 0);
				return;
			}

/*	  if (aztSendCmd(ACMD_SET_MODE)) RETURN("azt_poll 3");
	  outb(0x01, DATA_PORT);
	  PA_OK;
	  STEN_LOW;
*/
			if (aztSendCmd(ACMD_GET_STATUS))
				RETURN("azt_poll 4");
			STEN_LOW;
			azt_mode = 1;
			azt_state = AZT_S_READ;
			AztTimeout = 3000;

			break;


		case AZT_S_READ:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_READ\n");
			}
#endif
			if (!skip) {
				if ((st = aztStatus()) != -1) {
					if ((st & AST_DSK_CHG)
					    || (st & AST_NOT_READY)) {
						aztDiskChanged = 1;
						aztTocUpToDate = 0;
						azt_invalidate_buffers();
						printk
						    ("aztcd: Disk Changed or Not Ready 3 - Unmount Disk!\n");
						end_request(CURRENT, 0);
					}
				} else
					break;
			}

			skip = 0;
			if ((st & AST_DOOR_OPEN) || (st & AST_NOT_READY)) {
				aztDiskChanged = 1;
				aztTocUpToDate = 0;
				printk((st & AST_DOOR_OPEN) ?
				       "aztcd: door open\n" :
				       "aztcd: disk removed\n");
				if (azt_transfer_is_active) {
					azt_state = AZT_S_START;
					loop_ctl = 1;
					break;
				}
				azt_state = AZT_S_IDLE;
				while (current_valid())
					end_request(CURRENT, 0);
				return;
			}

			if (current_valid()) {
				struct azt_Play_msf msf;
				int i;
				azt_next_bn = CURRENT->sector / 4;
				azt_hsg2msf(azt_next_bn, &msf.start);
				i = 0;
				/* find out in which track we are */
				while (azt_msf2hsg(&msf.start) >
				       azt_msf2hsg(&Toc[++i].trackTime)) {
				};
				if (azt_msf2hsg(&msf.start) <
				    azt_msf2hsg(&Toc[i].trackTime) -
				    AZT_BUF_SIZ) {
					azt_read_count = AZT_BUF_SIZ;	/*fast, because we read ahead */
					/*azt_read_count=CURRENT->nr_sectors;    slow, no read ahead */
				} else	/* don't read beyond end of track */
#if AZT_MULTISESSION
				{
					azt_read_count =
					    (azt_msf2hsg(&Toc[i].trackTime)
					     / 4) * 4 -
					    azt_msf2hsg(&msf.start);
					if (azt_read_count < 0)
						azt_read_count = 0;
					if (azt_read_count > AZT_BUF_SIZ)
						azt_read_count =
						    AZT_BUF_SIZ;
					printk
					    ("aztcd: warning - trying to read beyond end of track\n");
/*               printk("%i %i %li %li\n",i,azt_read_count,azt_msf2hsg(&msf.start),azt_msf2hsg(&Toc[i].trackTime));
*/ }
#else
				{
					azt_read_count = AZT_BUF_SIZ;
				}
#endif
				msf.end.min = 0;
				msf.end.sec = 0;
				msf.end.frame = azt_read_count;	/*Mitsumi here reads 0xffffff sectors */
#ifdef AZT_TEST3
				printk
				    ("---reading msf-address %x:%x:%x  %x:%x:%x\n",
				     msf.start.min, msf.start.sec,
				     msf.start.frame, msf.end.min,
				     msf.end.sec, msf.end.frame);
				printk
				    ("azt_next_bn:%x  azt_buf_in:%x azt_buf_out:%x  azt_buf_bn:%x\n",
				     azt_next_bn, azt_buf_in, azt_buf_out,
				     azt_buf_bn[azt_buf_in]);
#endif
				if (azt_read_mode == AZT_MODE_2) {
					sendAztCmd(ACMD_PLAY_READ_RAW, &msf);	/*XA disks in raw mode */
				} else {
					sendAztCmd(ACMD_PLAY_READ, &msf);	/*others in cooked mode */
				}
				azt_state = AZT_S_DATA;
				AztTimeout = READ_TIMEOUT;
			} else {
				azt_state = AZT_S_STOP;
				loop_ctl = 1;
				break;
			}

			break;


		case AZT_S_DATA:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_DATA\n");
			}
#endif

			st = inb(STATUS_PORT) & AFL_STATUSorDATA;

			switch (st) {

			case AFL_DATA:
#ifdef AZT_TEST3
				if (st != azt_st_old) {
					azt_st_old = st;
					printk("---AFL_DATA st:%x\n", st);
				}
#endif
				if (!AztTries--) {
					printk
					    ("aztcd: Read of Block %d Failed, Maybe Audio Disk ? Giving up\n",
					     azt_next_bn);
					if (azt_transfer_is_active) {
						AztTries = 0;
						break;
					}
					if (current_valid())
						end_request(CURRENT, 0);
					AztTries = 5;
				}
				azt_state = AZT_S_START;
				AztTimeout = READ_TIMEOUT;
				loop_ctl = 1;
				break;

			case AFL_STATUSorDATA:
#ifdef AZT_TEST3
				if (st != azt_st_old) {
					azt_st_old = st;
					printk
					    ("---AFL_STATUSorDATA st:%x\n",
					     st);
				}
#endif
				break;

			default:
#ifdef AZT_TEST3
				if (st != azt_st_old) {
					azt_st_old = st;
					printk("---default: st:%x\n", st);
				}
#endif
				AztTries = 5;
				if (!current_valid() && azt_buf_in == azt_buf_out) {
					azt_state = AZT_S_STOP;
					loop_ctl = 1;
					break;
				}
				if (azt_read_count <= 0)
					printk
					    ("aztcd: warning - try to read 0 frames\n");
				while (azt_read_count) {	/*??? fast read ahead loop */
					azt_buf_bn[azt_buf_in] = -1;
					DTEN_LOW;	/*??? unsolved problem, very
							   seldom we get timeouts
							   here, don't now the real
							   reason. With my drive this
							   sometimes also happens with
							   Aztech's original driver under
							   DOS. Is it a hardware bug? 
							   I tried to recover from such
							   situations here. Zimmermann */
					if (aztTimeOutCount >= AZT_TIMEOUT) {
						printk
						    ("read_count:%d CURRENT->nr_sectors:%ld azt_buf_in:%d\n",
						     azt_read_count,
						     CURRENT->nr_sectors,
						     azt_buf_in);
						printk
						    ("azt_transfer_is_active:%x\n",
						     azt_transfer_is_active);
						azt_read_count = 0;
						azt_state = AZT_S_STOP;
						loop_ctl = 1;
						end_request(CURRENT, 1);	/*should we have here (1) or (0)? */
					} else {
						if (azt_read_mode ==
						    AZT_MODE_2) {
							insb(DATA_PORT,
							     azt_buf +
							     CD_FRAMESIZE_RAW
							     * azt_buf_in,
							     CD_FRAMESIZE_RAW);
						} else {
							insb(DATA_PORT,
							     azt_buf +
							     CD_FRAMESIZE *
							     azt_buf_in,
							     CD_FRAMESIZE);
						}
						azt_read_count--;
#ifdef AZT_TEST3
						printk
						    ("AZT_S_DATA; ---I've read data- read_count: %d\n",
						     azt_read_count);
						printk
						    ("azt_next_bn:%d  azt_buf_in:%d azt_buf_out:%d  azt_buf_bn:%d\n",
						     azt_next_bn,
						     azt_buf_in,
						     azt_buf_out,
						     azt_buf_bn
						     [azt_buf_in]);
#endif
						azt_buf_bn[azt_buf_in] =
						    azt_next_bn++;
						if (azt_buf_out == -1)
							azt_buf_out =
							    azt_buf_in;
						azt_buf_in =
						    azt_buf_in + 1 ==
						    AZT_BUF_SIZ ? 0 :
						    azt_buf_in + 1;
					}
				}
				if (!azt_transfer_is_active) {
					while (current_valid()) {
						azt_transfer();
						if (CURRENT->nr_sectors ==
						    0)
							end_request(CURRENT, 1);
						else
							break;
					}
				}

				if (current_valid()
				    && (CURRENT->sector / 4 < azt_next_bn
					|| CURRENT->sector / 4 >
					azt_next_bn + AZT_BUF_SIZ)) {
					azt_state = AZT_S_STOP;
					loop_ctl = 1;
					break;
				}
				AztTimeout = READ_TIMEOUT;
				if (azt_read_count == 0) {
					azt_state = AZT_S_STOP;
					loop_ctl = 1;
					break;
				}
				break;
			}
			break;


		case AZT_S_STOP:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_STOP\n");
			}
#endif
			if (azt_read_count != 0)
				printk("aztcd: discard data=%x frames\n",
				       azt_read_count);
			while (azt_read_count != 0) {
				int i;
				if (!(inb(STATUS_PORT) & AFL_DATA)) {
					if (azt_read_mode == AZT_MODE_2)
						for (i = 0;
						     i < CD_FRAMESIZE_RAW;
						     i++)
							inb(DATA_PORT);
					else
						for (i = 0;
						     i < CD_FRAMESIZE; i++)
							inb(DATA_PORT);
				}
				azt_read_count--;
			}
			if (aztSendCmd(ACMD_GET_STATUS))
				RETURN("azt_poll 5");
			azt_state = AZT_S_STOPPING;
			AztTimeout = 1000;
			break;

		case AZT_S_STOPPING:
#ifdef AZT_TEST3
			if (azt_state != azt_state_old) {
				azt_state_old = azt_state;
				printk("AZT_S_STOPPING\n");
			}
#endif

			if ((st = aztStatus()) == -1 && AztTimeout)
				break;

			if ((st != -1)
			    && ((st & AST_DSK_CHG)
				|| (st & AST_NOT_READY))) {
				aztDiskChanged = 1;
				aztTocUpToDate = 0;
				azt_invalidate_buffers();
				printk
				    ("aztcd: Disk Changed or Not Ready 4 - Unmount Disk!\n");
				end_request(CURRENT, 0);
			}

#ifdef AZT_TEST3
			printk("CURRENT_VALID %d azt_mode %d\n",
			       current_valid(), azt_mode);
#endif

			if (current_valid()) {
				if (st != -1) {
					if (azt_mode == 1) {
						azt_state = AZT_S_READ;
						loop_ctl = 1;
						skip = 1;
						break;
					} else {
						azt_state = AZT_S_MODE;
						loop_ctl = 1;
						skip = 1;
						break;
					}
				} else {
					azt_state = AZT_S_START;
					AztTimeout = 1;
				}
			} else {
				azt_state = AZT_S_IDLE;
				return;
			}
			break;

		default:
			printk("aztcd: invalid state %d\n", azt_state);
			return;
		}		/* case */
	}			/* while */


	if (!AztTimeout--) {
		printk("aztcd: timeout in state %d\n", azt_state);
		azt_state = AZT_S_STOP;
		if (aztSendCmd(ACMD_STOP))
			RETURN("azt_poll 6");
		STEN_LOW_WAIT;
	};

	SET_TIMER(azt_poll, HZ / 100);
}


/*###########################################################################
 * Miscellaneous support functions
  ###########################################################################
*/
static void azt_hsg2msf(long hsg, struct msf *msf)
{
	hsg += 150;
	msf->min = hsg / 4500;
	hsg %= 4500;
	msf->sec = hsg / 75;
	msf->frame = hsg % 75;
#ifdef AZT_DEBUG
	if (msf->min >= 70)
		printk("aztcd: Error hsg2msf address Minutes\n");
	if (msf->sec >= 60)
		printk("aztcd: Error hsg2msf address Seconds\n");
	if (msf->frame >= 75)
		printk("aztcd: Error hsg2msf address Frames\n");
#endif
	azt_bin2bcd(&msf->min);	/* convert to BCD */
	azt_bin2bcd(&msf->sec);
	azt_bin2bcd(&msf->frame);
}

static long azt_msf2hsg(struct msf *mp)
{
	return azt_bcd2bin(mp->frame) + azt_bcd2bin(mp->sec) * 75
	    + azt_bcd2bin(mp->min) * 4500 - CD_MSF_OFFSET;
}

static void azt_bin2bcd(unsigned char *p)
{
	int u, t;

	u = *p % 10;
	t = *p / 10;
	*p = u | (t << 4);
}

static int azt_bcd2bin(unsigned char bcd)
{
	return (bcd >> 4) * 10 + (bcd & 0xF);
}

MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(AZTECH_CDROM_MAJOR);