summaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-cd.c
blob: 4f7ce70562280ee2c9c08f67d12b7c39691f74f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
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
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
/*
 * linux/drivers/ide/ide-cd.c
 *
 * Copyright (C) 1994, 1995, 1996  scott snyder  <snyder@fnald0.fnal.gov>
 * Copyright (C) 1996-1998  Erik Andersen <andersee@debian.org>
 * Copyright (C) 1998-2000  Jens Axboe <axboe@suse.de>
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * ATAPI CD-ROM driver.  To be used with ide.c.
 * See Documentation/cdrom/ide-cd for usage information.
 *
 * Suggestions are welcome. Patches that work are more welcome though. ;-)
 * For those wishing to work on this driver, please be sure you download
 * and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI 
 * (SFF-8020i rev 2.6) standards. These documents can be obtained by 
 * anonymous ftp from:
 * ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
 * ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
 *
 * Drives that deviate from these standards will be accommodated as much
 * as possible via compile time or command-line options.  Since I only have
 * a few drives, you generally need to send me patches...
 *
 * ----------------------------------
 * TO DO LIST:
 * -Make it so that Pioneer CD DR-A24X and friends don't get screwed up on
 *   boot
 *
 * ----------------------------------
 * 1.00  Oct 31, 1994 -- Initial version.
 * 1.01  Nov  2, 1994 -- Fixed problem with starting request in
 *                       cdrom_check_status.
 * 1.03  Nov 25, 1994 -- leaving unmask_intr[] as a user-setting (as for disks)
 * (from mlord)       -- minor changes to cdrom_setup()
 *                    -- renamed ide_dev_s to ide_drive_t, enable irq on command
 * 2.00  Nov 27, 1994 -- Generalize packet command interface;
 *                       add audio ioctls.
 * 2.01  Dec  3, 1994 -- Rework packet command interface to handle devices
 *                       which send an interrupt when ready for a command.
 * 2.02  Dec 11, 1994 -- Cache the TOC in the driver.
 *                       Don't use SCMD_PLAYAUDIO_TI; it's not included
 *                       in the current version of ATAPI.
 *                       Try to use LBA instead of track or MSF addressing
 *                       when possible.
 *                       Don't wait for READY_STAT.
 * 2.03  Jan 10, 1995 -- Rewrite block read routines to handle block sizes
 *                       other than 2k and to move multiple sectors in a
 *                       single transaction.
 * 2.04  Apr 21, 1995 -- Add work-around for Creative Labs CD220E drives.
 *                       Thanks to Nick Saw <cwsaw@pts7.pts.mot.com> for
 *                       help in figuring this out.  Ditto for Acer and
 *                       Aztech drives, which seem to have the same problem.
 * 2.04b May 30, 1995 -- Fix to match changes in ide.c version 3.16 -ml
 * 2.05  Jun  8, 1995 -- Don't attempt to retry after an illegal request
 *                        or data protect error.
 *                       Use HWIF and DEV_HWIF macros as in ide.c.
 *                       Always try to do a request_sense after
 *                        a failed command.
 *                       Include an option to give textual descriptions
 *                        of ATAPI errors.
 *                       Fix a bug in handling the sector cache which
 *                        showed up if the drive returned data in 512 byte
 *                        blocks (like Pioneer drives).  Thanks to
 *                        Richard Hirst <srh@gpt.co.uk> for diagnosing this.
 *                       Properly supply the page number field in the
 *                        MODE_SELECT command.
 *                       PLAYAUDIO12 is broken on the Aztech; work around it.
 * 2.05x Aug 11, 1995 -- lots of data structure renaming/restructuring in ide.c
 *                       (my apologies to Scott, but now ide-cd.c is independent)
 * 3.00  Aug 22, 1995 -- Implement CDROMMULTISESSION ioctl.
 *                       Implement CDROMREADAUDIO ioctl (UNTESTED).
 *                       Use input_ide_data() and output_ide_data().
 *                       Add door locking.
 *                       Fix usage count leak in cdrom_open, which happened
 *                        when a read-write mount was attempted.
 *                       Try to load the disk on open.
 *                       Implement CDROMEJECT_SW ioctl (off by default).
 *                       Read total cdrom capacity during open.
 *                       Rearrange logic in cdrom_decode_status.  Issue
 *                        request sense commands for failed packet commands
 *                        from here instead of from cdrom_queue_packet_command.
 *                        Fix a race condition in retrieving error information.
 *                       Suppress printing normal unit attention errors and
 *                        some drive not ready errors.
 *                       Implement CDROMVOLREAD ioctl.
 *                       Implement CDROMREADMODE1/2 ioctls.
 *                       Fix race condition in setting up interrupt handlers
 *                        when the `serialize' option is used.
 * 3.01  Sep  2, 1995 -- Fix ordering of reenabling interrupts in
 *                        cdrom_queue_request.
 *                       Another try at using ide_[input,output]_data.
 * 3.02  Sep 16, 1995 -- Stick total disk capacity in partition table as well.
 *                       Make VERBOSE_IDE_CD_ERRORS dump failed command again.
 *                       Dump out more information for ILLEGAL REQUEST errs.
 *                       Fix handling of errors occurring before the
 *                        packet command is transferred.
 *                       Fix transfers with odd bytelengths.
 * 3.03  Oct 27, 1995 -- Some Creative drives have an id of just `CD'.
 *                       `DCI-2S10' drives are broken too.
 * 3.04  Nov 20, 1995 -- So are Vertos drives.
 * 3.05  Dec  1, 1995 -- Changes to go with overhaul of ide.c and ide-tape.c
 * 3.06  Dec 16, 1995 -- Add support needed for partitions.
 *                       More workarounds for Vertos bugs (based on patches
 *                        from Holger Dietze <dietze@aix520.informatik.uni-leipzig.de>).
 *                       Try to eliminate byteorder assumptions.
 *                       Use atapi_cdrom_subchnl struct definition.
 *                       Add STANDARD_ATAPI compilation option.
 * 3.07  Jan 29, 1996 -- More twiddling for broken drives: Sony 55D,
 *                        Vertos 300.
 *                       Add NO_DOOR_LOCKING configuration option.
 *                       Handle drive_cmd requests w/NULL args (for hdparm -t).
 *                       Work around sporadic Sony55e audio play problem.
 * 3.07a Feb 11, 1996 -- check drive->id for NULL before dereferencing, to fix
 *                        problem with "hde=cdrom" with no drive present.  -ml
 * 3.08  Mar  6, 1996 -- More Vertos workarounds.
 * 3.09  Apr  5, 1996 -- Add CDROMCLOSETRAY ioctl.
 *                       Switch to using MSF addressing for audio commands.
 *                       Reformat to match kernel tabbing style.
 *                       Add CDROM_GET_UPC ioctl.
 * 3.10  Apr 10, 1996 -- Fix compilation error with STANDARD_ATAPI.
 * 3.11  Apr 29, 1996 -- Patch from Heiko Eissfeldt <heiko@colossus.escape.de>
 *                       to remove redundant verify_area calls.
 * 3.12  May  7, 1996 -- Rudimentary changer support.  Based on patches
 *                        from Gerhard Zuber <zuber@berlin.snafu.de>.
 *                       Let open succeed even if there's no loaded disc.
 * 3.13  May 19, 1996 -- Fixes for changer code.
 * 3.14  May 29, 1996 -- Add work-around for Vertos 600.
 *                        (From Hennus Bergman <hennus@sky.ow.nl>.)
 * 3.15  July 2, 1996 -- Added support for Sanyo 3 CD changers
 *                        from Ben Galliart <bgallia@luc.edu> with 
 *                        special help from Jeff Lightfoot 
 *                        <jeffml@pobox.com>
 * 3.15a July 9, 1996 -- Improved Sanyo 3 CD changer identification
 * 3.16  Jul 28, 1996 -- Fix from Gadi to reduce kernel stack usage for ioctl.
 * 3.17  Sep 17, 1996 -- Tweak audio reads for some drives.
 *                       Start changing CDROMLOADFROMSLOT to CDROM_SELECT_DISC.
 * 3.18  Oct 31, 1996 -- Added module and DMA support.
 *                       
 *                       
 * 4.00  Nov 5, 1996   -- New ide-cd maintainer,
 *                                 Erik B. Andersen <andersee@debian.org>
 *                     -- Newer Creative drives don't always set the error
 *                          register correctly.  Make sure we see media changes
 *                          regardless.
 *                     -- Integrate with generic cdrom driver.
 *                     -- CDROMGETSPINDOWN and CDROMSETSPINDOWN ioctls, based on
 *                          a patch from Ciro Cattuto <>.
 *                     -- Call set_device_ro.
 *                     -- Implement CDROMMECHANISMSTATUS and CDROMSLOTTABLE
 *                          ioctls, based on patch by Erik Andersen
 *                     -- Add some probes of drive capability during setup.
 *
 * 4.01  Nov 11, 1996  -- Split into ide-cd.c and ide-cd.h
 *                     -- Removed CDROMMECHANISMSTATUS and CDROMSLOTTABLE 
 *                          ioctls in favor of a generalized approach 
 *                          using the generic cdrom driver.
 *                     -- Fully integrated with the 2.1.X kernel.
 *                     -- Other stuff that I forgot (lots of changes)
 *
 * 4.02  Dec 01, 1996  -- Applied patch from Gadi Oxman <gadio@netvision.net.il>
 *                          to fix the drive door locking problems.
 *
 * 4.03  Dec 04, 1996  -- Added DSC overlap support.
 * 4.04  Dec 29, 1996  -- Added CDROMREADRAW ioclt based on patch 
 *                          by Ales Makarov (xmakarov@sun.felk.cvut.cz)
 *
 * 4.05  Nov 20, 1997  -- Modified to print more drive info on init
 *                        Minor other changes
 *                        Fix errors on CDROMSTOP (If you have a "Dolphin",
 *                          you must define IHAVEADOLPHIN)
 *                        Added identifier so new Sanyo CD-changer works
 *                        Better detection if door locking isn't supported
 *
 * 4.06  Dec 17, 1997  -- fixed endless "tray open" messages  -ml
 * 4.07  Dec 17, 1997  -- fallback to set pc->stat on "tray open"
 * 4.08  Dec 18, 1997  -- spew less noise when tray is empty
 *                     -- fix speed display for ACER 24X, 18X
 * 4.09  Jan 04, 1998  -- fix handling of the last block so we return
 *                         an end of file instead of an I/O error (Gadi)
 * 4.10  Jan 24, 1998  -- fixed a bug so now changers can change to a new
 *                         slot when there is no disc in the current slot.
 *                     -- Fixed a memory leak where info->changer_info was
 *                         malloc'ed but never free'd when closing the device.
 *                     -- Cleaned up the global namespace a bit by making more
 *                         functions static that should already have been.
 * 4.11  Mar 12, 1998  -- Added support for the CDROM_SELECT_SPEED ioctl
 *                         based on a patch for 2.0.33 by Jelle Foks 
 *                         <jelle@scintilla.utwente.nl>, a patch for 2.0.33
 *                         by Toni Giorgino <toni@pcape2.pi.infn.it>, the SCSI
 *                         version, and my own efforts.  -erik
 *                     -- Fixed a stupid bug which egcs was kind enough to
 *                         inform me of where "Illegal mode for this track"
 *                         was never returned due to a comparison on data
 *                         types of limited range.
 * 4.12  Mar 29, 1998  -- Fixed bug in CDROM_SELECT_SPEED so write speed is 
 *                         now set ionly for CD-R and CD-RW drives.  I had 
 *                         removed this support because it produced errors.
 *                         It produced errors _only_ for non-writers. duh.
 * 4.13  May 05, 1998  -- Suppress useless "in progress of becoming ready"
 *                         messages, since this is not an error.
 *                     -- Change error messages to be const
 *                     -- Remove a "\t" which looks ugly in the syslogs
 * 4.14  July 17, 1998 -- Change to pointing to .ps version of ATAPI spec
 *                         since the .pdf version doesn't seem to work...
 *                     -- Updated the TODO list to something more current.
 *
 * 4.15  Aug 25, 1998  -- Updated ide-cd.h to respect mechine endianess, 
 *                         patch thanks to "Eddie C. Dost" <ecd@skynet.be>
 *
 * 4.50  Oct 19, 1998  -- New maintainers!
 *                         Jens Axboe <axboe@image.dk>
 *                         Chris Zwilling <chris@cloudnet.com>
 *
 * 4.51  Dec 23, 1998  -- Jens Axboe <axboe@image.dk>
 *                      - ide_cdrom_reset enabled since the ide subsystem
 *                         handles resets fine now. <axboe@image.dk>
 *                      - Transfer size fix for Samsung CD-ROMs, thanks to
 *                        "Ville Hallik" <ville.hallik@mail.ee>.
 *                      - other minor stuff.
 *
 * 4.52  Jan 19, 1999  -- Jens Axboe <axboe@image.dk>
 *                      - Detect DVD-ROM/RAM drives
 *
 * 4.53  Feb 22, 1999   - Include other model Samsung and one Goldstar
 *                         drive in transfer size limit.
 *                      - Fix the I/O error when doing eject without a medium
 *                         loaded on some drives.
 *                      - CDROMREADMODE2 is now implemented through
 *                         CDROMREADRAW, since many drives don't support
 *                         MODE2 (even though ATAPI 2.6 says they must).
 *                      - Added ignore parameter to ide-cd (as a module), eg
 *                         	insmod ide-cd ignore='hda hdb'
 *                         Useful when using ide-cd in conjunction with
 *                         ide-scsi. TODO: non-modular way of doing the
 *                         same.
 *
 * 4.54  Aug 5, 1999	- Support for MMC2 class commands through the generic
 *			  packet interface to cdrom.c.
 *			- Unified audio ioctl support, most of it.
 *			- cleaned up various deprecated verify_area().
 *			- Added ide_cdrom_packet() as the interface for
 *			  the Uniform generic_packet().
 *			- bunch of other stuff, will fill in logs later.
 *			- report 1 slot for non-changers, like the other
 *			  cd-rom drivers. don't report select disc for
 *			  non-changers as well.
 *			- mask out audio playing, if the device can't do it.
 *
 * 4.55  Sep 1, 1999	- Eliminated the rest of the audio ioctls, except
 *			  for CDROMREADTOC[ENTRY|HEADER]. Some of the drivers
 *			  use this independently of the actual audio handling.
 *			  They will disappear later when I get the time to
 *			  do it cleanly.
 *			- Minimize the TOC reading - only do it when we
 *			  know a media change has occurred.
 *			- Moved all the CDROMREADx ioctls to the Uniform layer.
 *			- Heiko Eissfeldt <heiko@colossus.escape.de> supplied
 *			  some fixes for CDI.
 *			- CD-ROM leaving door locked fix from Andries
 *			  Brouwer <Andries.Brouwer@cwi.nl>
 *			- Erik Andersen <andersen@xmission.com> unified
 *			  commands across the various drivers and how
 *			  sense errors are handled.
 *
 * 4.56  Sep 12, 1999	- Removed changer support - it is now in the
 *			  Uniform layer.
 *			- Added partition based multisession handling.
 *			- Mode sense and mode select moved to the
 *			  Uniform layer.
 *			- Fixed a problem with WPI CDS-32X drive - it
 *			  failed the capabilities 
 *
 * 4.57  Apr 7, 2000	- Fixed sense reporting.
 *			- Fixed possible oops in ide_cdrom_get_last_session()
 *			- Fix locking mania and make ide_cdrom_reset relock
 *			- Stop spewing errors to log when magicdev polls with
 *			  TEST_UNIT_READY on some drives.
 *			- Various fixes from Tobias Ringstrom:
 *			  tray if it was locked prior to the reset.
 *			  - cdrom_read_capacity returns one frame too little.
 *			  - Fix real capacity reporting.
 *
 * 4.58  May 1, 2000	- Clean up ACER50 stuff.
 *			- Fix small problem with ide_cdrom_capacity
 *
 * 4.59  Aug 11, 2000	- Fix changer problem in cdrom_read_toc, we weren't
 *			  correctly sensing a disc change.
 *			- Rearranged some code
 *			- Use extended sense on drives that support it for
 *			  correctly reporting tray status -- from
 *			  Michael D Johnson <johnsom@orst.edu>
 * 4.60  Dec 17, 2003	- Add mt rainier support
 *			- Bump timeout for packet commands, matches sr
 *			- Odd stuff
 * 4.61  Jan 22, 2004	- support hardware sector sizes other than 2kB,
 *			  Pascal Schmidt <der.eremit@email.de>
 *
 *************************************************************************/
 
#define IDECD_VERSION "4.61"

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/completion.h>

#include <scsi/scsi.h>	/* For SCSI -> ATAPI command conversion */

#include <asm/irq.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include "ide-cd.h"

static DECLARE_MUTEX(idecd_ref_sem);

#define to_ide_cd(obj) container_of(obj, struct cdrom_info, kref) 

#define ide_cd_g(disk) \
	container_of((disk)->private_data, struct cdrom_info, driver)

static struct cdrom_info *ide_cd_get(struct gendisk *disk)
{
	struct cdrom_info *cd = NULL;

	down(&idecd_ref_sem);
	cd = ide_cd_g(disk);
	if (cd)
		kref_get(&cd->kref);
	up(&idecd_ref_sem);
	return cd;
}

static void ide_cd_release(struct kref *);

static void ide_cd_put(struct cdrom_info *cd)
{
	down(&idecd_ref_sem);
	kref_put(&cd->kref, ide_cd_release);
	up(&idecd_ref_sem);
}

/****************************************************************************
 * Generic packet command support and error handling routines.
 */

/* Mark that we've seen a media change, and invalidate our internal
   buffers. */
static void cdrom_saw_media_change (ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	
	CDROM_STATE_FLAGS (drive)->media_changed = 1;
	CDROM_STATE_FLAGS (drive)->toc_valid = 0;
	info->nsectors_buffered = 0;
}

static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
			   struct request_sense *sense)
{
	int log = 0;

	if (!sense || !rq || (rq->flags & REQ_QUIET))
		return 0;

	switch (sense->sense_key) {
		case NO_SENSE: case RECOVERED_ERROR:
			break;
		case NOT_READY:
			/*
			 * don't care about tray state messages for
			 * e.g. capacity commands or in-progress or
			 * becoming ready
			 */
			if (sense->asc == 0x3a || sense->asc == 0x04)
				break;
			log = 1;
			break;
		case ILLEGAL_REQUEST:
			/*
			 * don't log START_STOP unit with LoEj set, since
			 * we cannot reliably check if drive can auto-close
			 */
			if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
				log = 0;
			break;
		case UNIT_ATTENTION:
			/*
			 * Make good and sure we've seen this potential media
			 * change. Some drives (i.e. Creative) fail to present
			 * the correct sense key in the error register.
			 */
			cdrom_saw_media_change(drive);
			break;
		default:
			log = 1;
			break;
	}
	return log;
}

static
void cdrom_analyze_sense_data(ide_drive_t *drive,
			      struct request *failed_command,
			      struct request_sense *sense)
{
	if (!cdrom_log_sense(drive, failed_command, sense))
		return;

	/*
	 * If a read toc is executed for a CD-R or CD-RW medium where
	 * the first toc has not been recorded yet, it will fail with
	 * 05/24/00 (which is a confusing error)
	 */
	if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
		if (sense->sense_key == 0x05 && sense->asc == 0x24)
			return;

#if VERBOSE_IDE_CD_ERRORS
	{
		int i;
		const char *s;
		char buf[80];

		printk ("ATAPI device %s:\n", drive->name);
		if (sense->error_code==0x70)
			printk("  Error: ");
		else if (sense->error_code==0x71)
			printk("  Deferred Error: ");
		else if (sense->error_code == 0x7f)
			printk("  Vendor-specific Error: ");
		else
			printk("  Unknown Error Type: ");

		if (sense->sense_key < ARY_LEN(sense_key_texts))
			s = sense_key_texts[sense->sense_key];
		else
			s = "bad sense key!";

		printk("%s -- (Sense key=0x%02x)\n", s, sense->sense_key);

		if (sense->asc == 0x40) {
			sprintf(buf, "Diagnostic failure on component 0x%02x",
				 sense->ascq);
			s = buf;
		} else {
			int lo = 0, mid, hi = ARY_LEN(sense_data_texts);
			unsigned long key = (sense->sense_key << 16);
			key |= (sense->asc << 8);
			if (!(sense->ascq >= 0x80 && sense->ascq <= 0xdd))
				key |= sense->ascq;
			s = NULL;

			while (hi > lo) {
				mid = (lo + hi) / 2;
				if (sense_data_texts[mid].asc_ascq == key ||
				    sense_data_texts[mid].asc_ascq == (0xff0000|key)) {
					s = sense_data_texts[mid].text;
					break;
				}
				else if (sense_data_texts[mid].asc_ascq > key)
					hi = mid;
				else
					lo = mid+1;
			}
		}

		if (s == NULL) {
			if (sense->asc > 0x80)
				s = "(vendor-specific error)";
			else
				s = "(reserved error code)";
		}

		printk(KERN_ERR "  %s -- (asc=0x%02x, ascq=0x%02x)\n",
			s, sense->asc, sense->ascq);

		if (failed_command != NULL) {

			int lo=0, mid, hi= ARY_LEN (packet_command_texts);
			s = NULL;

			while (hi > lo) {
				mid = (lo + hi) / 2;
				if (packet_command_texts[mid].packet_command ==
				    failed_command->cmd[0]) {
					s = packet_command_texts[mid].text;
					break;
				}
				if (packet_command_texts[mid].packet_command >
				    failed_command->cmd[0])
					hi = mid;
				else
					lo = mid+1;
			}

			printk (KERN_ERR "  The failed \"%s\" packet command was: \n  \"", s);
			for (i=0; i<sizeof (failed_command->cmd); i++)
				printk ("%02x ", failed_command->cmd[i]);
			printk ("\"\n");
		}

		/* The SKSV bit specifies validity of the sense_key_specific
		 * in the next two commands. It is bit 7 of the first byte.
		 * In the case of NOT_READY, if SKSV is set the drive can
		 * give us nice ETA readings.
		 */
		if (sense->sense_key == NOT_READY && (sense->sks[0] & 0x80)) {
			int progress = (sense->sks[1] << 8 | sense->sks[2]) * 100;
			printk(KERN_ERR "  Command is %02d%% complete\n", progress / 0xffff);

		}

		if (sense->sense_key == ILLEGAL_REQUEST &&
		    (sense->sks[0] & 0x80) != 0) {
			printk(KERN_ERR "  Error in %s byte %d",
				(sense->sks[0] & 0x40) != 0 ?
				"command packet" : "command data",
				(sense->sks[1] << 8) + sense->sks[2]);

			if ((sense->sks[0] & 0x40) != 0)
				printk (" bit %d", sense->sks[0] & 0x07);

			printk ("\n");
		}
	}

#else /* not VERBOSE_IDE_CD_ERRORS */

	/* Suppress printing unit attention and `in progress of becoming ready'
	   errors when we're not being verbose. */

	if (sense->sense_key == UNIT_ATTENTION ||
	    (sense->sense_key == NOT_READY && (sense->asc == 4 ||
						sense->asc == 0x3a)))
		return;

	printk(KERN_ERR "%s: error code: 0x%02x  sense_key: 0x%02x  asc: 0x%02x  ascq: 0x%02x\n",
		drive->name,
		sense->error_code, sense->sense_key,
		sense->asc, sense->ascq);
#endif /* not VERBOSE_IDE_CD_ERRORS */
}

/*
 * Initialize a ide-cd packet command request
 */
static void cdrom_prepare_request(ide_drive_t *drive, struct request *rq)
{
	struct cdrom_info *cd = drive->driver_data;

	ide_init_drive_cmd(rq);
	rq->flags = REQ_PC;
	rq->rq_disk = cd->disk;
}

static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
				      struct request *failed_command)
{
	struct cdrom_info *info		= drive->driver_data;
	struct request *rq		= &info->request_sense_request;

	if (sense == NULL)
		sense = &info->sense_data;

	/* stuff the sense request in front of our current request */
	cdrom_prepare_request(drive, rq);

	rq->data = sense;
	rq->cmd[0] = GPCMD_REQUEST_SENSE;
	rq->cmd[4] = rq->data_len = 18;

	rq->flags = REQ_SENSE;

	/* NOTE! Save the failed command in "rq->buffer" */
	rq->buffer = (void *) failed_command;

	(void) ide_do_drive_cmd(drive, rq, ide_preempt);
}

static void cdrom_end_request (ide_drive_t *drive, int uptodate)
{
	struct request *rq = HWGROUP(drive)->rq;
	int nsectors = rq->hard_cur_sectors;

	if ((rq->flags & REQ_SENSE) && uptodate) {
		/*
		 * For REQ_SENSE, "rq->buffer" points to the original failed
		 * request
		 */
		struct request *failed = (struct request *) rq->buffer;
		struct cdrom_info *info = drive->driver_data;
		void *sense = &info->sense_data;
		unsigned long flags;

		if (failed) {
			if (failed->sense) {
				sense = failed->sense;
				failed->sense_len = rq->sense_len;
			}

			/*
			 * now end failed request
			 */
			spin_lock_irqsave(&ide_lock, flags);
			end_that_request_chunk(failed, 0, failed->data_len);
			end_that_request_last(failed);
			spin_unlock_irqrestore(&ide_lock, flags);
		}

		cdrom_analyze_sense_data(drive, failed, sense);
	}

	if (!rq->current_nr_sectors && blk_fs_request(rq))
		uptodate = 1;
	/* make sure it's fully ended */
	if (blk_pc_request(rq))
		nsectors = (rq->data_len + 511) >> 9;
	if (!nsectors)
		nsectors = 1;

	ide_end_request(drive, uptodate, nsectors);
}

/* Returns 0 if the request should be continued.
   Returns 1 if the request was ended. */
static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
{
	struct request *rq = HWGROUP(drive)->rq;
	int stat, err, sense_key;
	
	/* Check for errors. */
	stat = HWIF(drive)->INB(IDE_STATUS_REG);
	if (stat_ret)
		*stat_ret = stat;

	if (OK_STAT(stat, good_stat, BAD_R_STAT))
		return 0;

	/* Get the IDE error register. */
	err = HWIF(drive)->INB(IDE_ERROR_REG);
	sense_key = err >> 4;

	if (rq == NULL) {
		printk("%s: missing rq in cdrom_decode_status\n", drive->name);
		return 1;
	}

	if (rq->flags & REQ_SENSE) {
		/* We got an error trying to get sense info
		   from the drive (probably while trying
		   to recover from a former error).  Just give up. */

		rq->flags |= REQ_FAILED;
		cdrom_end_request(drive, 0);
		ide_error(drive, "request sense failure", stat);
		return 1;

	} else if (rq->flags & (REQ_PC | REQ_BLOCK_PC)) {
		/* All other functions, except for READ. */
		unsigned long flags;

		/*
		 * if we have an error, pass back CHECK_CONDITION as the
		 * scsi status byte
		 */
		if ((rq->flags & REQ_BLOCK_PC) && !rq->errors)
			rq->errors = SAM_STAT_CHECK_CONDITION;

		/* Check for tray open. */
		if (sense_key == NOT_READY) {
			cdrom_saw_media_change (drive);
		} else if (sense_key == UNIT_ATTENTION) {
			/* Check for media change. */
			cdrom_saw_media_change (drive);
			/*printk("%s: media changed\n",drive->name);*/
			return 0;
		} else if (!(rq->flags & REQ_QUIET)) {
			/* Otherwise, print an error. */
			ide_dump_status(drive, "packet command error", stat);
		}
		
		rq->flags |= REQ_FAILED;

		/*
		 * instead of playing games with moving completions around,
		 * remove failed request completely and end it when the
		 * request sense has completed
		 */
		if (stat & ERR_STAT) {
			spin_lock_irqsave(&ide_lock, flags);
			blkdev_dequeue_request(rq);
			HWGROUP(drive)->rq = NULL;
			spin_unlock_irqrestore(&ide_lock, flags);

			cdrom_queue_request_sense(drive, rq->sense, rq);
		} else
			cdrom_end_request(drive, 0);

	} else if (blk_fs_request(rq)) {
		int do_end_request = 0;

		/* Handle errors from READ and WRITE requests. */

		if (blk_noretry_request(rq))
			do_end_request = 1;

		if (sense_key == NOT_READY) {
			/* Tray open. */
			if (rq_data_dir(rq) == READ) {
				cdrom_saw_media_change (drive);

				/* Fail the request. */
				printk ("%s: tray open\n", drive->name);
				do_end_request = 1;
			} else {
				struct cdrom_info *info = drive->driver_data;

				/* allow the drive 5 seconds to recover, some
				 * devices will return this error while flushing
				 * data from cache */
				if (!rq->errors)
					info->write_timeout = jiffies + ATAPI_WAIT_WRITE_BUSY;
				rq->errors = 1;
				if (time_after(jiffies, info->write_timeout))
					do_end_request = 1;
				else {
					unsigned long flags;

					/*
					 * take a breather relying on the
					 * unplug timer to kick us again
					 */
					spin_lock_irqsave(&ide_lock, flags);
					blk_plug_device(drive->queue);
					spin_unlock_irqrestore(&ide_lock,flags);
					return 1;
				}
			}
		} else if (sense_key == UNIT_ATTENTION) {
			/* Media change. */
			cdrom_saw_media_change (drive);

			/* Arrange to retry the request.
			   But be sure to give up if we've retried
			   too many times. */
			if (++rq->errors > ERROR_MAX)
				do_end_request = 1;
		} else if (sense_key == ILLEGAL_REQUEST ||
			   sense_key == DATA_PROTECT) {
			/* No point in retrying after an illegal
			   request or data protect error.*/
			ide_dump_status (drive, "command error", stat);
			do_end_request = 1;
		} else if (sense_key == MEDIUM_ERROR) {
			/* No point in re-trying a zillion times on a bad 
			 * sector...  If we got here the error is not correctable */
			ide_dump_status (drive, "media error (bad sector)", stat);
			do_end_request = 1;
		} else if (sense_key == BLANK_CHECK) {
			/* Disk appears blank ?? */
			ide_dump_status (drive, "media error (blank)", stat);
			do_end_request = 1;
		} else if ((err & ~ABRT_ERR) != 0) {
			/* Go to the default handler
			   for other errors. */
			ide_error(drive, "cdrom_decode_status", stat);
			return 1;
		} else if ((++rq->errors > ERROR_MAX)) {
			/* We've racked up too many retries.  Abort. */
			do_end_request = 1;
		}

		if (do_end_request)
			cdrom_end_request(drive, 0);

		/* If we got a CHECK_CONDITION status,
		   queue a request sense command. */
		if ((stat & ERR_STAT) != 0)
			cdrom_queue_request_sense(drive, NULL, NULL);
	} else {
		blk_dump_rq_flags(rq, "ide-cd: bad rq");
		cdrom_end_request(drive, 0);
	}

	/* Retry, or handle the next request. */
	return 1;
}

static int cdrom_timer_expiry(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;
	unsigned long wait = 0;

	/*
	 * Some commands are *slow* and normally take a long time to
	 * complete. Usually we can use the ATAPI "disconnect" to bypass
	 * this, but not all commands/drives support that. Let
	 * ide_timer_expiry keep polling us for these.
	 */
	switch (rq->cmd[0]) {
		case GPCMD_BLANK:
		case GPCMD_FORMAT_UNIT:
		case GPCMD_RESERVE_RZONE_TRACK:
		case GPCMD_CLOSE_TRACK:
		case GPCMD_FLUSH_CACHE:
			wait = ATAPI_WAIT_PC;
			break;
		default:
			if (!(rq->flags & REQ_QUIET))
				printk(KERN_INFO "ide-cd: cmd 0x%x timed out\n", rq->cmd[0]);
			wait = 0;
			break;
	}
	return wait;
}

/* Set up the device registers for transferring a packet command on DEV,
   expecting to later transfer XFERLEN bytes.  HANDLER is the routine
   which actually transfers the command to the drive.  If this is a
   drq_interrupt device, this routine will arrange for HANDLER to be
   called when the interrupt from the drive arrives.  Otherwise, HANDLER
   will be called immediately after the drive is prepared for the transfer. */

static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
						  int xferlen,
						  ide_handler_t *handler)
{
	ide_startstop_t startstop;
	struct cdrom_info *info = drive->driver_data;
	ide_hwif_t *hwif = drive->hwif;

	/* Wait for the controller to be idle. */
	if (ide_wait_stat(&startstop, drive, 0, BUSY_STAT, WAIT_READY))
		return startstop;

	if (info->dma)
		info->dma = !hwif->dma_setup(drive);

	/* Set up the controller registers. */
	/* FIXME: for Virtual DMA we must check harder */
	HWIF(drive)->OUTB(info->dma, IDE_FEATURE_REG);
	HWIF(drive)->OUTB(0, IDE_IREASON_REG);
	HWIF(drive)->OUTB(0, IDE_SECTOR_REG);

	HWIF(drive)->OUTB(xferlen & 0xff, IDE_BCOUNTL_REG);
	HWIF(drive)->OUTB(xferlen >> 8  , IDE_BCOUNTH_REG);
	if (IDE_CONTROL_REG)
		HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 
	if (CDROM_CONFIG_FLAGS (drive)->drq_interrupt) {
		/* packet command */
		ide_execute_command(drive, WIN_PACKETCMD, handler, ATAPI_WAIT_PC, cdrom_timer_expiry);
		return ide_started;
	} else {
		unsigned long flags;

		/* packet command */
		spin_lock_irqsave(&ide_lock, flags);
		hwif->OUTBSYNC(drive, WIN_PACKETCMD, IDE_COMMAND_REG);
		ndelay(400);
		spin_unlock_irqrestore(&ide_lock, flags);

		return (*handler) (drive);
	}
}

/* Send a packet command to DRIVE described by CMD_BUF and CMD_LEN.
   The device registers must have already been prepared
   by cdrom_start_packet_command.
   HANDLER is the interrupt handler to call when the command completes
   or there's data ready. */
/*
 * changed 5 parameters to 3 for dvd-ram
 * struct packet_command *pc; now packet_command_t *pc;
 */
#define ATAPI_MIN_CDB_BYTES 12
static ide_startstop_t cdrom_transfer_packet_command (ide_drive_t *drive,
					  struct request *rq,
					  ide_handler_t *handler)
{
	ide_hwif_t *hwif = drive->hwif;
	int cmd_len;
	struct cdrom_info *info = drive->driver_data;
	ide_startstop_t startstop;

	if (CDROM_CONFIG_FLAGS(drive)->drq_interrupt) {
		/* Here we should have been called after receiving an interrupt
		   from the device.  DRQ should how be set. */

		/* Check for errors. */
		if (cdrom_decode_status(drive, DRQ_STAT, NULL))
			return ide_stopped;
	} else {
		/* Otherwise, we must wait for DRQ to get set. */
		if (ide_wait_stat(&startstop, drive, DRQ_STAT,
				BUSY_STAT, WAIT_READY))
			return startstop;
	}

	/* Arm the interrupt handler. */
	ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);

	/* ATAPI commands get padded out to 12 bytes minimum */
	cmd_len = COMMAND_SIZE(rq->cmd[0]);
	if (cmd_len < ATAPI_MIN_CDB_BYTES)
		cmd_len = ATAPI_MIN_CDB_BYTES;

	/* Send the command to the device. */
	HWIF(drive)->atapi_output_bytes(drive, rq->cmd, cmd_len);

	/* Start the DMA if need be */
	if (info->dma)
		hwif->dma_start(drive);

	return ide_started;
}

/****************************************************************************
 * Block read functions.
 */

/*
 * Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector
 * buffer.  Once the first sector is added, any subsequent sectors are
 * assumed to be continuous (until the buffer is cleared).  For the first
 * sector added, SECTOR is its sector number.  (SECTOR is then ignored until
 * the buffer is cleared.)
 */
static void cdrom_buffer_sectors (ide_drive_t *drive, unsigned long sector,
                                  int sectors_to_transfer)
{
	struct cdrom_info *info = drive->driver_data;

	/* Number of sectors to read into the buffer. */
	int sectors_to_buffer = min_t(int, sectors_to_transfer,
				     (SECTOR_BUFFER_SIZE >> SECTOR_BITS) -
				       info->nsectors_buffered);

	char *dest;

	/* If we couldn't get a buffer, don't try to buffer anything... */
	if (info->buffer == NULL)
		sectors_to_buffer = 0;

	/* If this is the first sector in the buffer, remember its number. */
	if (info->nsectors_buffered == 0)
		info->sector_buffered = sector;

	/* Read the data into the buffer. */
	dest = info->buffer + info->nsectors_buffered * SECTOR_SIZE;
	while (sectors_to_buffer > 0) {
		HWIF(drive)->atapi_input_bytes(drive, dest, SECTOR_SIZE);
		--sectors_to_buffer;
		--sectors_to_transfer;
		++info->nsectors_buffered;
		dest += SECTOR_SIZE;
	}

	/* Throw away any remaining data. */
	while (sectors_to_transfer > 0) {
		static char dum[SECTOR_SIZE];
		HWIF(drive)->atapi_input_bytes(drive, dum, sizeof (dum));
		--sectors_to_transfer;
	}
}

/*
 * Check the contents of the interrupt reason register from the cdrom
 * and attempt to recover if there are problems.  Returns  0 if everything's
 * ok; nonzero if the request has been terminated.
 */
static inline
int cdrom_read_check_ireason (ide_drive_t *drive, int len, int ireason)
{
	if (ireason == 2)
		return 0;
	else if (ireason == 0) {
		/* Whoops... The drive is expecting to receive data from us! */
		printk(KERN_ERR "%s: read_intr: Drive wants to transfer data the "
						"wrong way!\n", drive->name);

		/* Throw some data at the drive so it doesn't hang
		   and quit this request. */
		while (len > 0) {
			int dum = 0;
			HWIF(drive)->atapi_output_bytes(drive, &dum, sizeof (dum));
			len -= sizeof (dum);
		}
	} else  if (ireason == 1) {
		/* Some drives (ASUS) seem to tell us that status
		 * info is available. just get it and ignore.
		 */
		(void) HWIF(drive)->INB(IDE_STATUS_REG);
		return 0;
	} else {
		/* Drive wants a command packet, or invalid ireason... */
		printk(KERN_ERR "%s: read_intr: bad interrupt reason %x\n", drive->name,
								ireason);
	}

	cdrom_end_request(drive, 0);
	return -1;
}

/*
 * Interrupt routine.  Called when a read request has completed.
 */
static ide_startstop_t cdrom_read_intr (ide_drive_t *drive)
{
	int stat;
	int ireason, len, sectors_to_transfer, nskip;
	struct cdrom_info *info = drive->driver_data;
	u8 lowcyl = 0, highcyl = 0;
	int dma = info->dma, dma_error = 0;

	struct request *rq = HWGROUP(drive)->rq;

	/*
	 * handle dma case
	 */
	if (dma) {
		info->dma = 0;
		if ((dma_error = HWIF(drive)->ide_dma_end(drive)))
			__ide_dma_off(drive);
	}

	if (cdrom_decode_status(drive, 0, &stat))
		return ide_stopped;

	if (dma) {
		if (!dma_error) {
			ide_end_request(drive, 1, rq->nr_sectors);
			return ide_stopped;
		} else
			return ide_error(drive, "dma error", stat);
	}

	/* Read the interrupt reason and the transfer length. */
	ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
	lowcyl  = HWIF(drive)->INB(IDE_BCOUNTL_REG);
	highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);

	len = lowcyl + (256 * highcyl);

	/* If DRQ is clear, the command has completed. */
	if ((stat & DRQ_STAT) == 0) {
		/* If we're not done filling the current buffer, complain.
		   Otherwise, complete the command normally. */
		if (rq->current_nr_sectors > 0) {
			printk (KERN_ERR "%s: cdrom_read_intr: data underrun (%d blocks)\n",
				drive->name, rq->current_nr_sectors);
			rq->flags |= REQ_FAILED;
			cdrom_end_request(drive, 0);
		} else
			cdrom_end_request(drive, 1);
		return ide_stopped;
	}

	/* Check that the drive is expecting to do the same thing we are. */
	if (cdrom_read_check_ireason (drive, len, ireason))
		return ide_stopped;

	/* Assume that the drive will always provide data in multiples
	   of at least SECTOR_SIZE, as it gets hairy to keep track
	   of the transfers otherwise. */
	if ((len % SECTOR_SIZE) != 0) {
		printk (KERN_ERR "%s: cdrom_read_intr: Bad transfer size %d\n",
			drive->name, len);
		if (CDROM_CONFIG_FLAGS(drive)->limit_nframes)
			printk (KERN_ERR "  This drive is not supported by this version of the driver\n");
		else {
			printk (KERN_ERR "  Trying to limit transfer sizes\n");
			CDROM_CONFIG_FLAGS(drive)->limit_nframes = 1;
		}
		cdrom_end_request(drive, 0);
		return ide_stopped;
	}

	/* The number of sectors we need to read from the drive. */
	sectors_to_transfer = len / SECTOR_SIZE;

	/* First, figure out if we need to bit-bucket
	   any of the leading sectors. */
	nskip = min_t(int, rq->current_nr_sectors - bio_cur_sectors(rq->bio), sectors_to_transfer);

	while (nskip > 0) {
		/* We need to throw away a sector. */
		static char dum[SECTOR_SIZE];
		HWIF(drive)->atapi_input_bytes(drive, dum, sizeof (dum));

		--rq->current_nr_sectors;
		--nskip;
		--sectors_to_transfer;
	}

	/* Now loop while we still have data to read from the drive. */
	while (sectors_to_transfer > 0) {
		int this_transfer;

		/* If we've filled the present buffer but there's another
		   chained buffer after it, move on. */
		if (rq->current_nr_sectors == 0 && rq->nr_sectors)
			cdrom_end_request(drive, 1);

		/* If the buffers are full, cache the rest of the data in our
		   internal buffer. */
		if (rq->current_nr_sectors == 0) {
			cdrom_buffer_sectors(drive, rq->sector, sectors_to_transfer);
			sectors_to_transfer = 0;
		} else {
			/* Transfer data to the buffers.
			   Figure out how many sectors we can transfer
			   to the current buffer. */
			this_transfer = min_t(int, sectors_to_transfer,
					     rq->current_nr_sectors);

			/* Read this_transfer sectors
			   into the current buffer. */
			while (this_transfer > 0) {
				HWIF(drive)->atapi_input_bytes(drive, rq->buffer, SECTOR_SIZE);
				rq->buffer += SECTOR_SIZE;
				--rq->nr_sectors;
				--rq->current_nr_sectors;
				++rq->sector;
				--this_transfer;
				--sectors_to_transfer;
			}
		}
	}

	/* Done moving data!  Wait for another interrupt. */
	ide_set_handler(drive, &cdrom_read_intr, ATAPI_WAIT_PC, NULL);
	return ide_started;
}

/*
 * Try to satisfy some of the current read request from our cached data.
 * Returns nonzero if the request has been completed, zero otherwise.
 */
static int cdrom_read_from_buffer (ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	unsigned short sectors_per_frame;

	sectors_per_frame = queue_hardsect_size(drive->queue) >> SECTOR_BITS;

	/* Can't do anything if there's no buffer. */
	if (info->buffer == NULL) return 0;

	/* Loop while this request needs data and the next block is present
	   in our cache. */
	while (rq->nr_sectors > 0 &&
	       rq->sector >= info->sector_buffered &&
	       rq->sector < info->sector_buffered + info->nsectors_buffered) {
		if (rq->current_nr_sectors == 0)
			cdrom_end_request(drive, 1);

		memcpy (rq->buffer,
			info->buffer +
			(rq->sector - info->sector_buffered) * SECTOR_SIZE,
			SECTOR_SIZE);
		rq->buffer += SECTOR_SIZE;
		--rq->current_nr_sectors;
		--rq->nr_sectors;
		++rq->sector;
	}

	/* If we've satisfied the current request,
	   terminate it successfully. */
	if (rq->nr_sectors == 0) {
		cdrom_end_request(drive, 1);
		return -1;
	}

	/* Move on to the next buffer if needed. */
	if (rq->current_nr_sectors == 0)
		cdrom_end_request(drive, 1);

	/* If this condition does not hold, then the kluge i use to
	   represent the number of sectors to skip at the start of a transfer
	   will fail.  I think that this will never happen, but let's be
	   paranoid and check. */
	if (rq->current_nr_sectors < bio_cur_sectors(rq->bio) &&
	    (rq->sector & (sectors_per_frame - 1))) {
		printk(KERN_ERR "%s: cdrom_read_from_buffer: buffer botch (%ld)\n",
			drive->name, (long)rq->sector);
		cdrom_end_request(drive, 0);
		return -1;
	}

	return 0;
}

/*
 * Routine to send a read packet command to the drive.
 * This is usually called directly from cdrom_start_read.
 * However, for drq_interrupt devices, it is called from an interrupt
 * when the drive is ready to accept the command.
 */
static ide_startstop_t cdrom_start_read_continuation (ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;
	unsigned short sectors_per_frame;
	int nskip;

	sectors_per_frame = queue_hardsect_size(drive->queue) >> SECTOR_BITS;

	/* If the requested sector doesn't start on a cdrom block boundary,
	   we must adjust the start of the transfer so that it does,
	   and remember to skip the first few sectors.
	   If the CURRENT_NR_SECTORS field is larger than the size
	   of the buffer, it will mean that we're to skip a number
	   of sectors equal to the amount by which CURRENT_NR_SECTORS
	   is larger than the buffer size. */
	nskip = rq->sector & (sectors_per_frame - 1);
	if (nskip > 0) {
		/* Sanity check... */
		if (rq->current_nr_sectors != bio_cur_sectors(rq->bio) &&
			(rq->sector & (sectors_per_frame - 1))) {
			printk(KERN_ERR "%s: cdrom_start_read_continuation: buffer botch (%u)\n",
				drive->name, rq->current_nr_sectors);
			cdrom_end_request(drive, 0);
			return ide_stopped;
		}
		rq->current_nr_sectors += nskip;
	}

	/* Set up the command */
	rq->timeout = ATAPI_WAIT_PC;

	/* Send the command to the drive and return. */
	return cdrom_transfer_packet_command(drive, rq, &cdrom_read_intr);
}


#define IDECD_SEEK_THRESHOLD	(1000)			/* 1000 blocks */
#define IDECD_SEEK_TIMER	(5 * WAIT_MIN_SLEEP)	/* 100 ms */
#define IDECD_SEEK_TIMEOUT	(2 * WAIT_CMD)		/* 20 sec */

static ide_startstop_t cdrom_seek_intr (ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	int stat;
	static int retry = 10;

	if (cdrom_decode_status(drive, 0, &stat))
		return ide_stopped;
	CDROM_CONFIG_FLAGS(drive)->seeking = 1;

	if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {
		if (--retry == 0) {
			/*
			 * this condition is far too common, to bother
			 * users about it
			 */
			/* printk("%s: disabled DSC seek overlap\n", drive->name);*/ 
			drive->dsc_overlap = 0;
		}
	}
	return ide_stopped;
}

static ide_startstop_t cdrom_start_seek_continuation (ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;
	sector_t frame = rq->sector;

	sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);

	memset(rq->cmd, 0, sizeof(rq->cmd));
	rq->cmd[0] = GPCMD_SEEK;
	put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);

	rq->timeout = ATAPI_WAIT_PC;
	return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
}

static ide_startstop_t cdrom_start_seek (ide_drive_t *drive, unsigned int block)
{
	struct cdrom_info *info = drive->driver_data;

	info->dma = 0;
	info->cmd = 0;
	info->start_seek = jiffies;
	return cdrom_start_packet_command(drive, 0, cdrom_start_seek_continuation);
}

/* Fix up a possibly partially-processed request so that we can
   start it over entirely, or even put it back on the request queue. */
static void restore_request (struct request *rq)
{
	if (rq->buffer != bio_data(rq->bio)) {
		sector_t n = (rq->buffer - (char *) bio_data(rq->bio)) / SECTOR_SIZE;

		rq->buffer = bio_data(rq->bio);
		rq->nr_sectors += n;
		rq->sector -= n;
	}
	rq->hard_cur_sectors = rq->current_nr_sectors = bio_cur_sectors(rq->bio);
	rq->hard_nr_sectors = rq->nr_sectors;
	rq->hard_sector = rq->sector;
	rq->q->prep_rq_fn(rq->q, rq);
}

/*
 * Start a read request from the CD-ROM.
 */
static ide_startstop_t cdrom_start_read (ide_drive_t *drive, unsigned int block)
{
	struct cdrom_info *info = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	unsigned short sectors_per_frame;

	sectors_per_frame = queue_hardsect_size(drive->queue) >> SECTOR_BITS;

	/* We may be retrying this request after an error.  Fix up
	   any weirdness which might be present in the request packet. */
	restore_request(rq);

	/* Satisfy whatever we can of this request from our cached sector. */
	if (cdrom_read_from_buffer(drive))
		return ide_stopped;

	blk_attempt_remerge(drive->queue, rq);

	/* Clear the local sector buffer. */
	info->nsectors_buffered = 0;

	/* use dma, if possible. */
	info->dma = drive->using_dma;
	if ((rq->sector & (sectors_per_frame - 1)) ||
	    (rq->nr_sectors & (sectors_per_frame - 1)))
		info->dma = 0;

	info->cmd = READ;

	/* Start sending the read request to the drive. */
	return cdrom_start_packet_command(drive, 32768, cdrom_start_read_continuation);
}

/****************************************************************************
 * Execute all other packet commands.
 */

/* Interrupt routine for packet command completion. */
static ide_startstop_t cdrom_pc_intr (ide_drive_t *drive)
{
	int ireason, len, thislen;
	struct request *rq = HWGROUP(drive)->rq;
	u8 lowcyl = 0, highcyl = 0;
	int stat;

	/* Check for errors. */
	if (cdrom_decode_status(drive, 0, &stat))
		return ide_stopped;

	/* Read the interrupt reason and the transfer length. */
	ireason = HWIF(drive)->INB(IDE_IREASON_REG);
	lowcyl  = HWIF(drive)->INB(IDE_BCOUNTL_REG);
	highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);

	len = lowcyl + (256 * highcyl);

	/* If DRQ is clear, the command has completed.
	   Complain if we still have data left to transfer. */
	if ((stat & DRQ_STAT) == 0) {
		/* Some of the trailing request sense fields are optional, and
		   some drives don't send them.  Sigh. */
		if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
		    rq->data_len > 0 &&
		    rq->data_len <= 5) {
			while (rq->data_len > 0) {
				*(unsigned char *)rq->data++ = 0;
				--rq->data_len;
			}
		}

		if (rq->data_len == 0)
			cdrom_end_request(drive, 1);
		else {
			/* Comment this out, because this always happens 
			   right after a reset occurs, and it is annoying to 
			   always print expected stuff.  */
			/*
			printk ("%s: cdrom_pc_intr: data underrun %d\n",
				drive->name, pc->buflen);
			*/
			rq->flags |= REQ_FAILED;
			cdrom_end_request(drive, 0);
		}
		return ide_stopped;
	}

	/* Figure out how much data to transfer. */
	thislen = rq->data_len;
	if (thislen > len) thislen = len;

	/* The drive wants to be written to. */
	if ((ireason & 3) == 0) {
		if (!rq->data) {
			blk_dump_rq_flags(rq, "cdrom_pc_intr, write");
			goto confused;
		}
		/* Transfer the data. */
		HWIF(drive)->atapi_output_bytes(drive, rq->data, thislen);

		/* If we haven't moved enough data to satisfy the drive,
		   add some padding. */
		while (len > thislen) {
			int dum = 0;
			HWIF(drive)->atapi_output_bytes(drive, &dum, sizeof(dum));
			len -= sizeof(dum);
		}

		/* Keep count of how much data we've moved. */
		rq->data += thislen;
		rq->data_len -= thislen;
	}

	/* Same drill for reading. */
	else if ((ireason & 3) == 2) {
		if (!rq->data) {
			blk_dump_rq_flags(rq, "cdrom_pc_intr, write");
			goto confused;
		}
		/* Transfer the data. */
		HWIF(drive)->atapi_input_bytes(drive, rq->data, thislen);

		/* If we haven't moved enough data to satisfy the drive,
		   add some padding. */
		while (len > thislen) {
			int dum = 0;
			HWIF(drive)->atapi_input_bytes(drive, &dum, sizeof(dum));
			len -= sizeof(dum);
		}

		/* Keep count of how much data we've moved. */
		rq->data += thislen;
		rq->data_len -= thislen;

		if (rq->flags & REQ_SENSE)
			rq->sense_len += thislen;
	} else {
confused:
		printk (KERN_ERR "%s: cdrom_pc_intr: The drive "
			"appears confused (ireason = 0x%02x)\n",
			drive->name, ireason);
		rq->flags |= REQ_FAILED;
	}

	/* Now we wait for another interrupt. */
	ide_set_handler(drive, &cdrom_pc_intr, ATAPI_WAIT_PC, cdrom_timer_expiry);
	return ide_started;
}

static ide_startstop_t cdrom_do_pc_continuation (ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;

	if (!rq->timeout)
		rq->timeout = ATAPI_WAIT_PC;

	/* Send the command to the drive and return. */
	return cdrom_transfer_packet_command(drive, rq, &cdrom_pc_intr);
}


static ide_startstop_t cdrom_do_packet_command (ide_drive_t *drive)
{
	int len;
	struct request *rq = HWGROUP(drive)->rq;
	struct cdrom_info *info = drive->driver_data;

	info->dma = 0;
	info->cmd = 0;
	rq->flags &= ~REQ_FAILED;
	len = rq->data_len;

	/* Start sending the command to the drive. */
	return cdrom_start_packet_command(drive, len, cdrom_do_pc_continuation);
}


static
int cdrom_queue_packet_command(ide_drive_t *drive, struct request *rq)
{
	struct request_sense sense;
	int retries = 10;
	unsigned int flags = rq->flags;

	if (rq->sense == NULL)
		rq->sense = &sense;

	/* Start of retry loop. */
	do {
		int error;
		unsigned long time = jiffies;
		rq->flags = flags;

		error = ide_do_drive_cmd(drive, rq, ide_wait);
		time = jiffies - time;

		/* FIXME: we should probably abort/retry or something 
		 * in case of failure */
		if (rq->flags & REQ_FAILED) {
			/* The request failed.  Retry if it was due to a unit
			   attention status
			   (usually means media was changed). */
			struct request_sense *reqbuf = rq->sense;

			if (reqbuf->sense_key == UNIT_ATTENTION)
				cdrom_saw_media_change(drive);
			else if (reqbuf->sense_key == NOT_READY &&
				 reqbuf->asc == 4 && reqbuf->ascq != 4) {
				/* The drive is in the process of loading
				   a disk.  Retry, but wait a little to give
				   the drive time to complete the load. */
				ssleep(2);
			} else {
				/* Otherwise, don't retry. */
				retries = 0;
			}
			--retries;
		}

		/* End of retry loop. */
	} while ((rq->flags & REQ_FAILED) && retries >= 0);

	/* Return an error if the command failed. */
	return (rq->flags & REQ_FAILED) ? -EIO : 0;
}

/*
 * Write handling
 */
static inline int cdrom_write_check_ireason(ide_drive_t *drive, int len, int ireason)
{
	/* Two notes about IDE interrupt reason here - 0 means that
	 * the drive wants to receive data from us, 2 means that
	 * the drive is expecting to transfer data to us.
	 */
	if (ireason == 0)
		return 0;
	else if (ireason == 2) {
		/* Whoops... The drive wants to send data. */
		printk(KERN_ERR "%s: write_intr: wrong transfer direction!\n",
							drive->name);

		while (len > 0) {
			int dum = 0;
			HWIF(drive)->atapi_input_bytes(drive, &dum, sizeof(dum));
			len -= sizeof(dum);
		}
	} else {
		/* Drive wants a command packet, or invalid ireason... */
		printk(KERN_ERR "%s: write_intr: bad interrupt reason %x\n",
							drive->name, ireason);
	}

	cdrom_end_request(drive, 0);
	return 1;
}

static void post_transform_command(struct request *req)
{
	u8 *c = req->cmd;
	char *ibuf;

	if (!blk_pc_request(req))
		return;

	if (req->bio)
		ibuf = bio_data(req->bio);
	else
		ibuf = req->data;

	if (!ibuf)
		return;

	/*
	 * set ansi-revision and response data as atapi
	 */
	if (c[0] == GPCMD_INQUIRY) {
		ibuf[2] |= 2;
		ibuf[3] = (ibuf[3] & 0xf0) | 2;
	}
}

typedef void (xfer_func_t)(ide_drive_t *, void *, u32);

/*
 * best way to deal with dma that is not sector aligned right now... note
 * that in this path we are not using ->data or ->buffer at all. this irs
 * can replace cdrom_pc_intr, cdrom_read_intr, and cdrom_write_intr in the
 * future.
 */
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	struct request *rq = HWGROUP(drive)->rq;
	int dma_error, dma, stat, ireason, len, thislen;
	u8 lowcyl, highcyl;
	xfer_func_t *xferfunc;
	unsigned long flags;

	/* Check for errors. */
	dma_error = 0;
	dma = info->dma;
	if (dma) {
		info->dma = 0;
		dma_error = HWIF(drive)->ide_dma_end(drive);
	}

	if (cdrom_decode_status(drive, 0, &stat))
		return ide_stopped;

	/*
	 * using dma, transfer is complete now
	 */
	if (dma) {
		if (dma_error) {
			printk(KERN_ERR "ide-cd: dma error\n");
			__ide_dma_off(drive);
			return ide_error(drive, "dma error", stat);
		}

		end_that_request_chunk(rq, 1, rq->data_len);
		rq->data_len = 0;
		goto end_request;
	}

	/*
	 * ok we fall to pio :/
	 */
	ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
	lowcyl  = HWIF(drive)->INB(IDE_BCOUNTL_REG);
	highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);

	len = lowcyl + (256 * highcyl);
	thislen = rq->data_len;
	if (thislen > len)
		thislen = len;

	/*
	 * If DRQ is clear, the command has completed.
	 */
	if ((stat & DRQ_STAT) == 0)
		goto end_request;

	/*
	 * check which way to transfer data
	 */
	if (rq_data_dir(rq) == WRITE) {
		/*
		 * write to drive
		 */
		if (cdrom_write_check_ireason(drive, len, ireason))
			return ide_stopped;

		xferfunc = HWIF(drive)->atapi_output_bytes;
	} else  {
		/*
		 * read from drive
		 */
		if (cdrom_read_check_ireason(drive, len, ireason))
			return ide_stopped;

		xferfunc = HWIF(drive)->atapi_input_bytes;
	}

	/*
	 * transfer data
	 */
	while (thislen > 0) {
		int blen = blen = rq->data_len;
		char *ptr = rq->data;

		/*
		 * bio backed?
		 */
		if (rq->bio) {
			ptr = bio_data(rq->bio);
			blen = bio_iovec(rq->bio)->bv_len;
		}

		if (!ptr) {
			printk(KERN_ERR "%s: confused, missing data\n", drive->name);
			break;
		}

		if (blen > thislen)
			blen = thislen;

		xferfunc(drive, ptr, blen);

		thislen -= blen;
		len -= blen;
		rq->data_len -= blen;

		if (rq->bio)
			end_that_request_chunk(rq, 1, blen);
		else
			rq->data += blen;
	}

	/*
	 * pad, if necessary
	 */
	if (len > 0) {
		while (len > 0) {
			int pad = 0;

			xferfunc(drive, &pad, sizeof(pad));
			len -= sizeof(pad);
		}
	}

	if (HWGROUP(drive)->handler != NULL)
		BUG();

	ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, NULL);
	return ide_started;

end_request:
	if (!rq->data_len)
		post_transform_command(rq);

	spin_lock_irqsave(&ide_lock, flags);
	blkdev_dequeue_request(rq);
	end_that_request_last(rq);
	HWGROUP(drive)->rq = NULL;
	spin_unlock_irqrestore(&ide_lock, flags);
	return ide_stopped;
}

static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
{
	int stat, ireason, len, sectors_to_transfer, uptodate;
	struct cdrom_info *info = drive->driver_data;
	int dma_error = 0, dma = info->dma;
	u8 lowcyl = 0, highcyl = 0;

	struct request *rq = HWGROUP(drive)->rq;

	/* Check for errors. */
	if (dma) {
		info->dma = 0;
		if ((dma_error = HWIF(drive)->ide_dma_end(drive))) {
			printk(KERN_ERR "ide-cd: write dma error\n");
			__ide_dma_off(drive);
		}
	}

	if (cdrom_decode_status(drive, 0, &stat))
		return ide_stopped;

	/*
	 * using dma, transfer is complete now
	 */
	if (dma) {
		if (dma_error)
			return ide_error(drive, "dma error", stat);

		ide_end_request(drive, 1, rq->nr_sectors);
		return ide_stopped;
	}

	/* Read the interrupt reason and the transfer length. */
	ireason = HWIF(drive)->INB(IDE_IREASON_REG);
	lowcyl  = HWIF(drive)->INB(IDE_BCOUNTL_REG);
	highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);

	len = lowcyl + (256 * highcyl);

	/* If DRQ is clear, the command has completed. */
	if ((stat & DRQ_STAT) == 0) {
		/* If we're not done writing, complain.
		 * Otherwise, complete the command normally.
		 */
		uptodate = 1;
		if (rq->current_nr_sectors > 0) {
			printk(KERN_ERR "%s: write_intr: data underrun (%d blocks)\n",
			drive->name, rq->current_nr_sectors);
			uptodate = 0;
		}
		cdrom_end_request(drive, uptodate);
		return ide_stopped;
	}

	/* Check that the drive is expecting to do the same thing we are. */
	if (cdrom_write_check_ireason(drive, len, ireason))
		return ide_stopped;

	sectors_to_transfer = len / SECTOR_SIZE;

	/*
	 * now loop and write out the data
	 */
	while (sectors_to_transfer > 0) {
		int this_transfer;

		if (!rq->current_nr_sectors) {
			printk(KERN_ERR "ide-cd: write_intr: oops\n");
			break;
		}

		/*
		 * Figure out how many sectors we can transfer
		 */
		this_transfer = min_t(int, sectors_to_transfer, rq->current_nr_sectors);

		while (this_transfer > 0) {
			HWIF(drive)->atapi_output_bytes(drive, rq->buffer, SECTOR_SIZE);
			rq->buffer += SECTOR_SIZE;
			--rq->nr_sectors;
			--rq->current_nr_sectors;
			++rq->sector;
			--this_transfer;
			--sectors_to_transfer;
		}

		/*
		 * current buffer complete, move on
		 */
		if (rq->current_nr_sectors == 0 && rq->nr_sectors)
			cdrom_end_request(drive, 1);
	}

	/* re-arm handler */
	ide_set_handler(drive, &cdrom_write_intr, ATAPI_WAIT_PC, NULL);
	return ide_started;
}

static ide_startstop_t cdrom_start_write_cont(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;

#if 0	/* the immediate bit */
	rq->cmd[1] = 1 << 3;
#endif
	rq->timeout = ATAPI_WAIT_PC;

	return cdrom_transfer_packet_command(drive, rq, cdrom_write_intr);
}

static ide_startstop_t cdrom_start_write(ide_drive_t *drive, struct request *rq)
{
	struct cdrom_info *info = drive->driver_data;
	struct gendisk *g = info->disk;
	unsigned short sectors_per_frame = queue_hardsect_size(drive->queue) >> SECTOR_BITS;

	/*
	 * writes *must* be hardware frame aligned
	 */
	if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
	    (rq->sector & (sectors_per_frame - 1))) {
		cdrom_end_request(drive, 0);
		return ide_stopped;
	}

	/*
	 * disk has become write protected
	 */
	if (g->policy) {
		cdrom_end_request(drive, 0);
		return ide_stopped;
	}

	/*
	 * for dvd-ram and such media, it's a really big deal to get
	 * big writes all the time. so scour the queue and attempt to
	 * remerge requests, often the plugging will not have had time
	 * to do this properly
	 */
	blk_attempt_remerge(drive->queue, rq);

	info->nsectors_buffered = 0;

	/* use dma, if possible. we don't need to check more, since we
	 * know that the transfer is always (at least!) frame aligned */
	info->dma = drive->using_dma ? 1 : 0;
	info->cmd = WRITE;

	info->devinfo.media_written = 1;

	/* Start sending the write request to the drive. */
	return cdrom_start_packet_command(drive, 32768, cdrom_start_write_cont);
}

static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;

	if (!rq->timeout)
		rq->timeout = ATAPI_WAIT_PC;

	return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
}

static ide_startstop_t cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
{
	struct cdrom_info *info = drive->driver_data;

	rq->flags |= REQ_QUIET;

	info->dma = 0;
	info->cmd = 0;

	/*
	 * sg request
	 */
	if (rq->bio) {
		int mask = drive->queue->dma_alignment;
		unsigned long addr = (unsigned long) page_address(bio_page(rq->bio));

		info->cmd = rq_data_dir(rq);
		info->dma = drive->using_dma;

		/*
		 * check if dma is safe
		 */
		if ((rq->data_len & 3) || (addr & mask))
			info->dma = 0;
	}

	/* Start sending the command to the drive. */
	return cdrom_start_packet_command(drive, rq->data_len, cdrom_do_newpc_cont);
}

/****************************************************************************
 * cdrom driver request routine.
 */
static ide_startstop_t
ide_do_rw_cdrom (ide_drive_t *drive, struct request *rq, sector_t block)
{
	ide_startstop_t action;
	struct cdrom_info *info = drive->driver_data;

	if (blk_fs_request(rq)) {
		if (CDROM_CONFIG_FLAGS(drive)->seeking) {
			unsigned long elapsed = jiffies - info->start_seek;
			int stat = HWIF(drive)->INB(IDE_STATUS_REG);

			if ((stat & SEEK_STAT) != SEEK_STAT) {
				if (elapsed < IDECD_SEEK_TIMEOUT) {
					ide_stall_queue(drive, IDECD_SEEK_TIMER);
					return ide_stopped;
				}
				printk (KERN_ERR "%s: DSC timeout\n", drive->name);
			}
			CDROM_CONFIG_FLAGS(drive)->seeking = 0;
		}
		if ((rq_data_dir(rq) == READ) && IDE_LARGE_SEEK(info->last_block, block, IDECD_SEEK_THRESHOLD) && drive->dsc_overlap) {
			action = cdrom_start_seek(drive, block);
		} else {
			if (rq_data_dir(rq) == READ)
				action = cdrom_start_read(drive, block);
			else
				action = cdrom_start_write(drive, rq);
		}
		info->last_block = block;
		return action;
	} else if (rq->flags & (REQ_PC | REQ_SENSE)) {
		return cdrom_do_packet_command(drive);
	} else if (rq->flags & REQ_BLOCK_PC) {
		return cdrom_do_block_pc(drive, rq);
	} else if (rq->flags & REQ_SPECIAL) {
		/*
		 * right now this can only be a reset...
		 */
		cdrom_end_request(drive, 1);
		return ide_stopped;
	}

	blk_dump_rq_flags(rq, "ide-cd bad flags");
	cdrom_end_request(drive, 0);
	return ide_stopped;
}



/****************************************************************************
 * Ioctl handling.
 *
 * Routines which queue packet commands take as a final argument a pointer
 * to a request_sense struct.  If execution of the command results
 * in an error with a CHECK CONDITION status, this structure will be filled
 * with the results of the subsequent request sense command.  The pointer
 * can also be NULL, in which case no sense information is returned.
 */

#if ! STANDARD_ATAPI
static inline
int bin2bcd (int x)
{
	return (x%10) | ((x/10) << 4);
}


static inline
int bcd2bin (int x)
{
	return (x >> 4) * 10 + (x & 0x0f);
}

static
void msf_from_bcd (struct atapi_msf *msf)
{
	msf->minute = bcd2bin (msf->minute);
	msf->second = bcd2bin (msf->second);
	msf->frame  = bcd2bin (msf->frame);
}

#endif /* not STANDARD_ATAPI */


static inline
void lba_to_msf (int lba, byte *m, byte *s, byte *f)
{
	lba += CD_MSF_OFFSET;
	lba &= 0xffffff;  /* negative lbas use only 24 bits */
	*m = lba / (CD_SECS * CD_FRAMES);
	lba %= (CD_SECS * CD_FRAMES);
	*s = lba / CD_FRAMES;
	*f = lba % CD_FRAMES;
}


static inline
int msf_to_lba (byte m, byte s, byte f)
{
	return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
}

static int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)
{
	struct request req;
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *cdi = &info->devinfo;

	cdrom_prepare_request(drive, &req);

	req.sense = sense;
	req.cmd[0] = GPCMD_TEST_UNIT_READY;
	req.flags |= REQ_QUIET;

#if ! STANDARD_ATAPI
        /* the Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to 
           switch CDs instead of supporting the LOAD_UNLOAD opcode   */

	req.cmd[7] = cdi->sanyo_slot % 3;
#endif /* not STANDARD_ATAPI */

	return cdrom_queue_packet_command(drive, &req);
}


/* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */
static int
cdrom_lockdoor(ide_drive_t *drive, int lockflag, struct request_sense *sense)
{
	struct request_sense my_sense;
	struct request req;
	int stat;

	if (sense == NULL)
		sense = &my_sense;

	/* If the drive cannot lock the door, just pretend. */
	if (CDROM_CONFIG_FLAGS(drive)->no_doorlock) {
		stat = 0;
	} else {
		cdrom_prepare_request(drive, &req);
		req.sense = sense;
		req.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
		req.cmd[4] = lockflag ? 1 : 0;
		stat = cdrom_queue_packet_command(drive, &req);
	}

	/* If we got an illegal field error, the drive
	   probably cannot lock the door. */
	if (stat != 0 &&
	    sense->sense_key == ILLEGAL_REQUEST &&
	    (sense->asc == 0x24 || sense->asc == 0x20)) {
		printk (KERN_ERR "%s: door locking not supported\n",
			drive->name);
		CDROM_CONFIG_FLAGS(drive)->no_doorlock = 1;
		stat = 0;
	}
	
	/* no medium, that's alright. */
	if (stat != 0 && sense->sense_key == NOT_READY && sense->asc == 0x3a)
		stat = 0;

	if (stat == 0)
		CDROM_STATE_FLAGS(drive)->door_locked = lockflag;

	return stat;
}


/* Eject the disk if EJECTFLAG is 0.
   If EJECTFLAG is 1, try to reload the disk. */
static int cdrom_eject(ide_drive_t *drive, int ejectflag,
		       struct request_sense *sense)
{
	struct request req;
	char loej = 0x02;

	if (CDROM_CONFIG_FLAGS(drive)->no_eject && !ejectflag)
		return -EDRIVE_CANT_DO_THIS;
	
	/* reload fails on some drives, if the tray is locked */
	if (CDROM_STATE_FLAGS(drive)->door_locked && ejectflag)
		return 0;

	cdrom_prepare_request(drive, &req);

	/* only tell drive to close tray if open, if it can do that */
	if (ejectflag && !CDROM_CONFIG_FLAGS(drive)->close_tray)
		loej = 0;

	req.sense = sense;
	req.cmd[0] = GPCMD_START_STOP_UNIT;
	req.cmd[4] = loej | (ejectflag != 0);
	return cdrom_queue_packet_command(drive, &req);
}

static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
			       unsigned long *sectors_per_frame,
			       struct request_sense *sense)
{
	struct {
		__u32 lba;
		__u32 blocklen;
	} capbuf;

	int stat;
	struct request req;

	cdrom_prepare_request(drive, &req);

	req.sense = sense;
	req.cmd[0] = GPCMD_READ_CDVD_CAPACITY;
	req.data = (char *)&capbuf;
	req.data_len = sizeof(capbuf);

	stat = cdrom_queue_packet_command(drive, &req);
	if (stat == 0) {
		*capacity = 1 + be32_to_cpu(capbuf.lba);
		*sectors_per_frame =
			be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS;
	}

	return stat;
}

static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
				int format, char *buf, int buflen,
				struct request_sense *sense)
{
	struct request req;

	cdrom_prepare_request(drive, &req);

	req.sense = sense;
	req.data =  buf;
	req.data_len = buflen;
	req.flags |= REQ_QUIET;
	req.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	req.cmd[6] = trackno;
	req.cmd[7] = (buflen >> 8);
	req.cmd[8] = (buflen & 0xff);
	req.cmd[9] = (format << 6);

	if (msf_flag)
		req.cmd[1] = 2;

	return cdrom_queue_packet_command(drive, &req);
}


/* Try to read the entire TOC for the disk into our internal buffer. */
static int cdrom_read_toc(ide_drive_t *drive, struct request_sense *sense)
{
	int stat, ntracks, i;
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *cdi = &info->devinfo;
	struct atapi_toc *toc = info->toc;
	struct {
		struct atapi_toc_header hdr;
		struct atapi_toc_entry  ent;
	} ms_tmp;
	long last_written;
	unsigned long sectors_per_frame = SECTORS_PER_FRAME;

	if (toc == NULL) {
		/* Try to allocate space. */
		toc = (struct atapi_toc *) kmalloc (sizeof (struct atapi_toc),
						    GFP_KERNEL);
		info->toc = toc;
		if (toc == NULL) {
			printk (KERN_ERR "%s: No cdrom TOC buffer!\n", drive->name);
			return -ENOMEM;
		}
	}

	/* Check to see if the existing data is still valid.
	   If it is, just return. */
	(void) cdrom_check_status(drive, sense);

	if (CDROM_STATE_FLAGS(drive)->toc_valid)
		return 0;

	/* Try to get the total cdrom capacity and sector size. */
	stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
				   sense);
	if (stat)
		toc->capacity = 0x1fffff;

	set_capacity(info->disk, toc->capacity * sectors_per_frame);
	blk_queue_hardsect_size(drive->queue,
				sectors_per_frame << SECTOR_BITS);

	/* First read just the header, so we know how long the TOC is. */
	stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
				    sizeof(struct atapi_toc_header), sense);
	if (stat) return stat;

#if ! STANDARD_ATAPI
	if (CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd) {
		toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
		toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
	}
#endif  /* not STANDARD_ATAPI */

	ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
	if (ntracks <= 0)
		return -EIO;
	if (ntracks > MAX_TRACKS)
		ntracks = MAX_TRACKS;

	/* Now read the whole schmeer. */
	stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
				  (char *)&toc->hdr,
				   sizeof(struct atapi_toc_header) +
				   (ntracks + 1) *
				   sizeof(struct atapi_toc_entry), sense);

	if (stat && toc->hdr.first_track > 1) {
		/* Cds with CDI tracks only don't have any TOC entries,
		   despite of this the returned values are
		   first_track == last_track = number of CDI tracks + 1,
		   so that this case is indistinguishable from the same
		   layout plus an additional audio track.
		   If we get an error for the regular case, we assume
		   a CDI without additional audio tracks. In this case
		   the readable TOC is empty (CDI tracks are not included)
		   and only holds the Leadout entry. Heiko Ei�feldt */
		ntracks = 0;
		stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
					   (char *)&toc->hdr,
					   sizeof(struct atapi_toc_header) +
					   (ntracks + 1) *
					   sizeof(struct atapi_toc_entry),
					   sense);
		if (stat) {
			return stat;
		}
#if ! STANDARD_ATAPI
		if (CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd) {
			toc->hdr.first_track = bin2bcd(CDROM_LEADOUT);
			toc->hdr.last_track = bin2bcd(CDROM_LEADOUT);
		} else
#endif  /* not STANDARD_ATAPI */
		{
			toc->hdr.first_track = CDROM_LEADOUT;
			toc->hdr.last_track = CDROM_LEADOUT;
		}
	}

	if (stat)
		return stat;

	toc->hdr.toc_length = ntohs (toc->hdr.toc_length);

#if ! STANDARD_ATAPI
	if (CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd) {
		toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
		toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);
	}
#endif  /* not STANDARD_ATAPI */

	for (i=0; i<=ntracks; i++) {
#if ! STANDARD_ATAPI
		if (CDROM_CONFIG_FLAGS(drive)->tocaddr_as_bcd) {
			if (CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd)
				toc->ent[i].track = bcd2bin(toc->ent[i].track);
			msf_from_bcd(&toc->ent[i].addr.msf);
		}
#endif  /* not STANDARD_ATAPI */
		toc->ent[i].addr.lba = msf_to_lba (toc->ent[i].addr.msf.minute,
						   toc->ent[i].addr.msf.second,
						   toc->ent[i].addr.msf.frame);
	}

	/* Read the multisession information. */
	if (toc->hdr.first_track != CDROM_LEADOUT) {
		/* Read the multisession information. */
		stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
					   sizeof(ms_tmp), sense);
		if (stat) return stat;

		toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
	} else {
		ms_tmp.hdr.first_track = ms_tmp.hdr.last_track = CDROM_LEADOUT;
		toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
	}

#if ! STANDARD_ATAPI
	if (CDROM_CONFIG_FLAGS(drive)->tocaddr_as_bcd) {
		/* Re-read multisession information using MSF format */
		stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
					   sizeof(ms_tmp), sense);
		if (stat)
			return stat;

		msf_from_bcd (&ms_tmp.ent.addr.msf);
		toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
					  	   ms_tmp.ent.addr.msf.second,
						   ms_tmp.ent.addr.msf.frame);
	}
#endif  /* not STANDARD_ATAPI */

	toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);

	/* Now try to get the total cdrom capacity. */
	stat = cdrom_get_last_written(cdi, &last_written);
	if (!stat && (last_written > toc->capacity)) {
		toc->capacity = last_written;
		set_capacity(info->disk, toc->capacity * sectors_per_frame);
	}

	/* Remember that we've read this stuff. */
	CDROM_STATE_FLAGS(drive)->toc_valid = 1;

	return 0;
}


static int cdrom_read_subchannel(ide_drive_t *drive, int format, char *buf,
				 int buflen, struct request_sense *sense)
{
	struct request req;

	cdrom_prepare_request(drive, &req);

	req.sense = sense;
	req.data = buf;
	req.data_len = buflen;
	req.cmd[0] = GPCMD_READ_SUBCHANNEL;
	req.cmd[1] = 2;     /* MSF addressing */
	req.cmd[2] = 0x40;  /* request subQ data */
	req.cmd[3] = format;
	req.cmd[7] = (buflen >> 8);
	req.cmd[8] = (buflen & 0xff);
	return cdrom_queue_packet_command(drive, &req);
}

/* ATAPI cdrom drives are free to select the speed you request or any slower
   rate :-( Requesting too fast a speed will _not_ produce an error. */
static int cdrom_select_speed(ide_drive_t *drive, int speed,
			      struct request_sense *sense)
{
	struct request req;
	cdrom_prepare_request(drive, &req);

	req.sense = sense;
	if (speed == 0)
		speed = 0xffff; /* set to max */
	else
		speed *= 177;   /* Nx to kbytes/s */

	req.cmd[0] = GPCMD_SET_SPEED;
	/* Read Drive speed in kbytes/second MSB */
	req.cmd[2] = (speed >> 8) & 0xff;	
	/* Read Drive speed in kbytes/second LSB */
	req.cmd[3] = speed & 0xff;
	if (CDROM_CONFIG_FLAGS(drive)->cd_r ||
	    CDROM_CONFIG_FLAGS(drive)->cd_rw ||
	    CDROM_CONFIG_FLAGS(drive)->dvd_r) {
		/* Write Drive speed in kbytes/second MSB */
		req.cmd[4] = (speed >> 8) & 0xff;
		/* Write Drive speed in kbytes/second LSB */
		req.cmd[5] = speed & 0xff;
       }

	return cdrom_queue_packet_command(drive, &req);
}

static int cdrom_play_audio(ide_drive_t *drive, int lba_start, int lba_end)
{
	struct request_sense sense;
	struct request req;

	cdrom_prepare_request(drive, &req);

	req.sense = &sense;
	req.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
	lba_to_msf(lba_start, &req.cmd[3], &req.cmd[4], &req.cmd[5]);
	lba_to_msf(lba_end-1, &req.cmd[6], &req.cmd[7], &req.cmd[8]);

	return cdrom_queue_packet_command(drive, &req);
}

static int cdrom_get_toc_entry(ide_drive_t *drive, int track,
				struct atapi_toc_entry **ent)
{
	struct cdrom_info *info = drive->driver_data;
	struct atapi_toc *toc = info->toc;
	int ntracks;

	/*
	 * don't serve cached data, if the toc isn't valid
	 */
	if (!CDROM_STATE_FLAGS(drive)->toc_valid)
		return -EINVAL;

	/* Check validity of requested track number. */
	ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
	if (toc->hdr.first_track == CDROM_LEADOUT) ntracks = 0;
	if (track == CDROM_LEADOUT)
		*ent = &toc->ent[ntracks];
	else if (track < toc->hdr.first_track ||
		 track > toc->hdr.last_track)
		return -EINVAL;
	else
		*ent = &toc->ent[track - toc->hdr.first_track];

	return 0;
}

/* the generic packet interface to cdrom.c */
static int ide_cdrom_packet(struct cdrom_device_info *cdi,
			    struct packet_command *cgc)
{
	struct request req;
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;

	if (cgc->timeout <= 0)
		cgc->timeout = ATAPI_WAIT_PC;

	/* here we queue the commands from the uniform CD-ROM
	   layer. the packet must be complete, as we do not
	   touch it at all. */
	cdrom_prepare_request(drive, &req);
	memcpy(req.cmd, cgc->cmd, CDROM_PACKET_SIZE);
	if (cgc->sense)
		memset(cgc->sense, 0, sizeof(struct request_sense));
	req.data = cgc->buffer;
	req.data_len = cgc->buflen;
	req.timeout = cgc->timeout;

	if (cgc->quiet)
		req.flags |= REQ_QUIET;

	req.sense = cgc->sense;
	cgc->stat = cdrom_queue_packet_command(drive, &req);
	if (!cgc->stat)
		cgc->buflen -= req.data_len;
	return cgc->stat;
}

static
int ide_cdrom_dev_ioctl (struct cdrom_device_info *cdi,
			 unsigned int cmd, unsigned long arg)
{
	struct packet_command cgc;
	char buffer[16];
	int stat;

	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);

	/* These will be moved into the Uniform layer shortly... */
	switch (cmd) {
 	case CDROMSETSPINDOWN: {
 		char spindown;
 
 		if (copy_from_user(&spindown, (void __user *) arg, sizeof(char)))
			return -EFAULT;
 
                if ((stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0)))
			return stat;

 		buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);

 		return cdrom_mode_select(cdi, &cgc);
 	} 
 
 	case CDROMGETSPINDOWN: {
 		char spindown;
 
                if ((stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0)))
			return stat;
 
 		spindown = buffer[11] & 0x0f;
 
		if (copy_to_user((void __user *) arg, &spindown, sizeof (char)))
			return -EFAULT;
 
 		return 0;
 	}
  
	default:
		return -EINVAL;
	}

}

static
int ide_cdrom_audio_ioctl (struct cdrom_device_info *cdi,
			   unsigned int cmd, void *arg)
			   
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct cdrom_info *info = drive->driver_data;
	int stat;

	switch (cmd) {
	/*
	 * emulate PLAY_AUDIO_TI command with PLAY_AUDIO_10, since
	 * atapi doesn't support it
	 */
	case CDROMPLAYTRKIND: {
		unsigned long lba_start, lba_end;
		struct cdrom_ti *ti = (struct cdrom_ti *)arg;
		struct atapi_toc_entry *first_toc, *last_toc;

		stat = cdrom_get_toc_entry(drive, ti->cdti_trk0, &first_toc);
		if (stat)
			return stat;

		stat = cdrom_get_toc_entry(drive, ti->cdti_trk1, &last_toc);
		if (stat)
			return stat;

		if (ti->cdti_trk1 != CDROM_LEADOUT)
			++last_toc;
		lba_start = first_toc->addr.lba;
		lba_end   = last_toc->addr.lba;

		if (lba_end <= lba_start)
			return -EINVAL;

		return cdrom_play_audio(drive, lba_start, lba_end);
	}

	case CDROMREADTOCHDR: {
		struct cdrom_tochdr *tochdr = (struct cdrom_tochdr *) arg;
		struct atapi_toc *toc;

		/* Make sure our saved TOC is valid. */
		stat = cdrom_read_toc(drive, NULL);
		if (stat) return stat;

		toc = info->toc;
		tochdr->cdth_trk0 = toc->hdr.first_track;
		tochdr->cdth_trk1 = toc->hdr.last_track;

		return 0;
	}

	case CDROMREADTOCENTRY: {
		struct cdrom_tocentry *tocentry = (struct cdrom_tocentry*) arg;
		struct atapi_toc_entry *toce;

		stat = cdrom_get_toc_entry(drive, tocentry->cdte_track, &toce);
		if (stat) return stat;

		tocentry->cdte_ctrl = toce->control;
		tocentry->cdte_adr  = toce->adr;
		if (tocentry->cdte_format == CDROM_MSF) {
			lba_to_msf (toce->addr.lba,
				   &tocentry->cdte_addr.msf.minute,
				   &tocentry->cdte_addr.msf.second,
				   &tocentry->cdte_addr.msf.frame);
		} else
			tocentry->cdte_addr.lba = toce->addr.lba;

		return 0;
	}

	default:
		return -EINVAL;
	}
}

static
int ide_cdrom_reset (struct cdrom_device_info *cdi)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct request_sense sense;
	struct request req;
	int ret;

	cdrom_prepare_request(drive, &req);
	req.flags = REQ_SPECIAL | REQ_QUIET;
	ret = ide_do_drive_cmd(drive, &req, ide_wait);

	/*
	 * A reset will unlock the door. If it was previously locked,
	 * lock it again.
	 */
	if (CDROM_STATE_FLAGS(drive)->door_locked)
		(void) cdrom_lockdoor(drive, 1, &sense);

	return ret;
}


static
int ide_cdrom_tray_move (struct cdrom_device_info *cdi, int position)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct request_sense sense;

	if (position) {
		int stat = cdrom_lockdoor(drive, 0, &sense);
		if (stat) return stat;
	}

	return cdrom_eject(drive, !position, &sense);
}

static
int ide_cdrom_lock_door (struct cdrom_device_info *cdi, int lock)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	return cdrom_lockdoor(drive, lock, NULL);
}

static
int ide_cdrom_select_speed (struct cdrom_device_info *cdi, int speed)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct request_sense sense;
	int stat;

	if ((stat = cdrom_select_speed(drive, speed, &sense)) < 0)
		return stat;

        cdi->speed = CDROM_STATE_FLAGS(drive)->current_speed;
        return 0;
}

/*
 * add logic to try GET_EVENT command first to check for media and tray
 * status. this should be supported by newer cd-r/w and all DVD etc
 * drives
 */
static
int ide_cdrom_drive_status (struct cdrom_device_info *cdi, int slot_nr)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct media_event_desc med;
	struct request_sense sense;
	int stat;

	if (slot_nr != CDSL_CURRENT)
		return -EINVAL;

	stat = cdrom_check_status(drive, &sense);
	if (!stat || sense.sense_key == UNIT_ATTENTION)
		return CDS_DISC_OK;

	if (!cdrom_get_media_event(cdi, &med)) {
		if (med.media_present)
			return CDS_DISC_OK;
		else if (med.door_open)
			return CDS_TRAY_OPEN;
		else
			return CDS_NO_DISC;
	}

	if (sense.sense_key == NOT_READY && sense.asc == 0x04 && sense.ascq == 0x04)
		return CDS_DISC_OK;

	/*
	 * If not using Mt Fuji extended media tray reports,
	 * just return TRAY_OPEN since ATAPI doesn't provide
	 * any other way to detect this...
	 */
	if (sense.sense_key == NOT_READY) {
		if (sense.asc == 0x3a) {
			if (sense.ascq == 1)
				return CDS_NO_DISC;
			else if (sense.ascq == 0 || sense.ascq == 2)
				return CDS_TRAY_OPEN;
		}
	}

	return CDS_DRIVE_NOT_READY;
}

static
int ide_cdrom_get_last_session (struct cdrom_device_info *cdi,
				struct cdrom_multisession *ms_info)
{
	struct atapi_toc *toc;
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	struct cdrom_info *info = drive->driver_data;
	struct request_sense sense;
	int ret;

	if (!CDROM_STATE_FLAGS(drive)->toc_valid || info->toc == NULL)
		if ((ret = cdrom_read_toc(drive, &sense)))
			return ret;

	toc = info->toc;
	ms_info->addr.lba = toc->last_session_lba;
	ms_info->xa_flag = toc->xa_flag;

	return 0;
}

static
int ide_cdrom_get_mcn (struct cdrom_device_info *cdi,
		       struct cdrom_mcn *mcn_info)
{
	int stat;
	char mcnbuf[24];
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;

/* get MCN */
	if ((stat = cdrom_read_subchannel(drive, 2, mcnbuf, sizeof (mcnbuf), NULL)))
		return stat;

	memcpy (mcn_info->medium_catalog_number, mcnbuf+9,
		sizeof (mcn_info->medium_catalog_number)-1);
	mcn_info->medium_catalog_number[sizeof (mcn_info->medium_catalog_number)-1]
		= '\0';

	return 0;
}



/****************************************************************************
 * Other driver requests (open, close, check media change).
 */

static
int ide_cdrom_check_media_change_real (struct cdrom_device_info *cdi,
				       int slot_nr)
{
	ide_drive_t *drive = (ide_drive_t*) cdi->handle;
	int retval;
	
	if (slot_nr == CDSL_CURRENT) {
		(void) cdrom_check_status(drive, NULL);
		retval = CDROM_STATE_FLAGS(drive)->media_changed;
		CDROM_STATE_FLAGS(drive)->media_changed = 0;
		return retval;
	} else {
		return -EINVAL;
	}
}


static
int ide_cdrom_open_real (struct cdrom_device_info *cdi, int purpose)
{
	return 0;
}

/*
 * Close down the device.  Invalidate all cached blocks.
 */

static
void ide_cdrom_release_real (struct cdrom_device_info *cdi)
{
	ide_drive_t *drive = cdi->handle;

	if (!cdi->use_count)
		CDROM_STATE_FLAGS(drive)->toc_valid = 0;
}



/****************************************************************************
 * Device initialization.
 */
static struct cdrom_device_ops ide_cdrom_dops = {
	.open			= ide_cdrom_open_real,
	.release		= ide_cdrom_release_real,
	.drive_status		= ide_cdrom_drive_status,
	.media_changed		= ide_cdrom_check_media_change_real,
	.tray_move		= ide_cdrom_tray_move,
	.lock_door		= ide_cdrom_lock_door,
	.select_speed		= ide_cdrom_select_speed,
	.get_last_session	= ide_cdrom_get_last_session,
	.get_mcn		= ide_cdrom_get_mcn,
	.reset			= ide_cdrom_reset,
	.audio_ioctl		= ide_cdrom_audio_ioctl,
	.dev_ioctl		= ide_cdrom_dev_ioctl,
	.capability		= CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
				CDC_SELECT_SPEED | CDC_SELECT_DISC |
				CDC_MULTI_SESSION | CDC_MCN |
				CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET |
				CDC_IOCTLS | CDC_DRIVE_STATUS | CDC_CD_R |
				CDC_CD_RW | CDC_DVD | CDC_DVD_R| CDC_DVD_RAM |
				CDC_GENERIC_PACKET | CDC_MO_DRIVE | CDC_MRW |
				CDC_MRW_W | CDC_RAM,
	.generic_packet		= ide_cdrom_packet,
};

static int ide_cdrom_register (ide_drive_t *drive, int nslots)
{
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *devinfo = &info->devinfo;

	devinfo->ops = &ide_cdrom_dops;
	devinfo->mask = 0;
	devinfo->speed = CDROM_STATE_FLAGS(drive)->current_speed;
	devinfo->capacity = nslots;
	devinfo->handle = (void *) drive;
	strcpy(devinfo->name, drive->name);
	
	/* set capability mask to match the probe. */
	if (!CDROM_CONFIG_FLAGS(drive)->cd_r)
		devinfo->mask |= CDC_CD_R;
	if (!CDROM_CONFIG_FLAGS(drive)->cd_rw)
		devinfo->mask |= CDC_CD_RW;
	if (!CDROM_CONFIG_FLAGS(drive)->dvd)
		devinfo->mask |= CDC_DVD;
	if (!CDROM_CONFIG_FLAGS(drive)->dvd_r)
		devinfo->mask |= CDC_DVD_R;
	if (!CDROM_CONFIG_FLAGS(drive)->dvd_ram)
		devinfo->mask |= CDC_DVD_RAM;
	if (!CDROM_CONFIG_FLAGS(drive)->is_changer)
		devinfo->mask |= CDC_SELECT_DISC;
	if (!CDROM_CONFIG_FLAGS(drive)->audio_play)
		devinfo->mask |= CDC_PLAY_AUDIO;
	if (!CDROM_CONFIG_FLAGS(drive)->close_tray)
		devinfo->mask |= CDC_CLOSE_TRAY;
	if (!CDROM_CONFIG_FLAGS(drive)->mo_drive)
		devinfo->mask |= CDC_MO_DRIVE;

	devinfo->disk = info->disk;
	return register_cdrom(devinfo);
}

static
int ide_cdrom_get_capabilities(ide_drive_t *drive, struct atapi_capabilities_page *cap)
{
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *cdi = &info->devinfo;
	struct packet_command cgc;
	int stat, attempts = 3, size = sizeof(*cap);

	/*
	 * ACER50 (and others?) require the full spec length mode sense
	 * page capabilities size, but older drives break.
	 */
	if (!(!strcmp(drive->id->model, "ATAPI CD ROM DRIVE 50X MAX") ||
	    !strcmp(drive->id->model, "WPI CDS-32X")))
		size -= sizeof(cap->pad);

	init_cdrom_command(&cgc, cap, size, CGC_DATA_UNKNOWN);
	do { /* we seem to get stat=0x01,err=0x00 the first time (??) */
		stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
		if (!stat)
			break;
	} while (--attempts);
	return stat;
}

static
int ide_cdrom_probe_capabilities (ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *cdi = &info->devinfo;
	struct atapi_capabilities_page cap;
	int nslots = 1;

	if (drive->media == ide_optical) {
		CDROM_CONFIG_FLAGS(drive)->mo_drive = 1;
		CDROM_CONFIG_FLAGS(drive)->ram = 1;
		printk(KERN_ERR "%s: ATAPI magneto-optical drive\n", drive->name);
		return nslots;
	}

	if (CDROM_CONFIG_FLAGS(drive)->nec260 ||
	    !strcmp(drive->id->model,"STINGRAY 8422 IDE 8X CD-ROM 7-27-95")) {
		CDROM_CONFIG_FLAGS(drive)->no_eject = 0;
		CDROM_CONFIG_FLAGS(drive)->audio_play = 1;
		return nslots;
	}

	/*
	 * we have to cheat a little here. the packet will eventually
	 * be queued with ide_cdrom_packet(), which extracts the
	 * drive from cdi->handle. Since this device hasn't been
	 * registered with the Uniform layer yet, it can't do this.
	 * Same goes for cdi->ops.
	 */
	cdi->handle = (ide_drive_t *) drive;
	cdi->ops = &ide_cdrom_dops;

	if (ide_cdrom_get_capabilities(drive, &cap))
		return 0;

	if (cap.lock == 0)
		CDROM_CONFIG_FLAGS(drive)->no_doorlock = 1;
	if (cap.eject)
		CDROM_CONFIG_FLAGS(drive)->no_eject = 0;
	if (cap.cd_r_write)
		CDROM_CONFIG_FLAGS(drive)->cd_r = 1;
	if (cap.cd_rw_write) {
		CDROM_CONFIG_FLAGS(drive)->cd_rw = 1;
		CDROM_CONFIG_FLAGS(drive)->ram = 1;
	}
	if (cap.test_write)
		CDROM_CONFIG_FLAGS(drive)->test_write = 1;
	if (cap.dvd_ram_read || cap.dvd_r_read || cap.dvd_rom)
		CDROM_CONFIG_FLAGS(drive)->dvd = 1;
	if (cap.dvd_ram_write) {
		CDROM_CONFIG_FLAGS(drive)->dvd_ram = 1;
		CDROM_CONFIG_FLAGS(drive)->ram = 1;
	}
	if (cap.dvd_r_write)
		CDROM_CONFIG_FLAGS(drive)->dvd_r = 1;
	if (cap.audio_play)
		CDROM_CONFIG_FLAGS(drive)->audio_play = 1;
	if (cap.mechtype == mechtype_caddy || cap.mechtype == mechtype_popup)
		CDROM_CONFIG_FLAGS(drive)->close_tray = 0;

	/* Some drives used by Apple don't advertise audio play
	 * but they do support reading TOC & audio datas
	 */
	if (strcmp(drive->id->model, "MATSHITADVD-ROM SR-8187") == 0 ||
	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8186") == 0 ||
	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8176") == 0 ||
	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8174") == 0)
		CDROM_CONFIG_FLAGS(drive)->audio_play = 1;

#if ! STANDARD_ATAPI
	if (cdi->sanyo_slot > 0) {
		CDROM_CONFIG_FLAGS(drive)->is_changer = 1;
		nslots = 3;
	}

	else
#endif /* not STANDARD_ATAPI */
	if (cap.mechtype == mechtype_individual_changer ||
	    cap.mechtype == mechtype_cartridge_changer) {
		if ((nslots = cdrom_number_of_slots(cdi)) > 1) {
			CDROM_CONFIG_FLAGS(drive)->is_changer = 1;
			CDROM_CONFIG_FLAGS(drive)->supp_disc_present = 1;
		}
	}

	/* The ACER/AOpen 24X cdrom has the speed fields byte-swapped */
	if (!drive->id->model[0] &&
	    !strncmp(drive->id->fw_rev, "241N", 4)) {
		CDROM_STATE_FLAGS(drive)->current_speed  = 
			(((unsigned int)cap.curspeed) + (176/2)) / 176;
		CDROM_CONFIG_FLAGS(drive)->max_speed = 
			(((unsigned int)cap.maxspeed) + (176/2)) / 176;
	} else {
		CDROM_STATE_FLAGS(drive)->current_speed  = 
			(ntohs(cap.curspeed) + (176/2)) / 176;
		CDROM_CONFIG_FLAGS(drive)->max_speed = 
			(ntohs(cap.maxspeed) + (176/2)) / 176;
	}

	/* don't print speed if the drive reported 0.
	 */
	printk(KERN_INFO "%s: ATAPI", drive->name);
	if (CDROM_CONFIG_FLAGS(drive)->max_speed)
		printk(" %dX", CDROM_CONFIG_FLAGS(drive)->max_speed);
	printk(" %s", CDROM_CONFIG_FLAGS(drive)->dvd ? "DVD-ROM" : "CD-ROM");

	if (CDROM_CONFIG_FLAGS(drive)->dvd_r|CDROM_CONFIG_FLAGS(drive)->dvd_ram)
        	printk(" DVD%s%s", 
        	(CDROM_CONFIG_FLAGS(drive)->dvd_r)? "-R" : "", 
        	(CDROM_CONFIG_FLAGS(drive)->dvd_ram)? "-RAM" : "");

        if (CDROM_CONFIG_FLAGS(drive)->cd_r|CDROM_CONFIG_FLAGS(drive)->cd_rw) 
        	printk(" CD%s%s", 
        	(CDROM_CONFIG_FLAGS(drive)->cd_r)? "-R" : "", 
        	(CDROM_CONFIG_FLAGS(drive)->cd_rw)? "/RW" : "");

        if (CDROM_CONFIG_FLAGS(drive)->is_changer) 
        	printk(" changer w/%d slots", nslots);
        else 	
        	printk(" drive");

	printk(", %dkB Cache", be16_to_cpu(cap.buffer_size));

	if (drive->using_dma)
		ide_dma_verbose(drive);

	printk("\n");

	return nslots;
}

static void ide_cdrom_add_settings(ide_drive_t *drive)
{
	ide_add_setting(drive,	"dsc_overlap",		SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1,	1, &drive->dsc_overlap, NULL);
}

/*
 * standard prep_rq_fn that builds 10 byte cmds
 */
static int ide_cdrom_prep_fs(request_queue_t *q, struct request *rq)
{
	int hard_sect = queue_hardsect_size(q);
	long block = (long)rq->hard_sector / (hard_sect >> 9);
	unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);

	memset(rq->cmd, 0, sizeof(rq->cmd));

	if (rq_data_dir(rq) == READ)
		rq->cmd[0] = GPCMD_READ_10;
	else
		rq->cmd[0] = GPCMD_WRITE_10;

	/*
	 * fill in lba
	 */
	rq->cmd[2] = (block >> 24) & 0xff;
	rq->cmd[3] = (block >> 16) & 0xff;
	rq->cmd[4] = (block >>  8) & 0xff;
	rq->cmd[5] = block & 0xff;

	/*
	 * and transfer length
	 */
	rq->cmd[7] = (blocks >> 8) & 0xff;
	rq->cmd[8] = blocks & 0xff;
	rq->cmd_len = 10;
	return BLKPREP_OK;
}

/*
 * Most of the SCSI commands are supported directly by ATAPI devices.
 * This transform handles the few exceptions.
 */
static int ide_cdrom_prep_pc(struct request *rq)
{
	u8 *c = rq->cmd;

	/*
	 * Transform 6-byte read/write commands to the 10-byte version
	 */
	if (c[0] == READ_6 || c[0] == WRITE_6) {
		c[8] = c[4];
		c[5] = c[3];
		c[4] = c[2];
		c[3] = c[1] & 0x1f;
		c[2] = 0;
		c[1] &= 0xe0;
		c[0] += (READ_10 - READ_6);
		rq->cmd_len = 10;
		return BLKPREP_OK;
	}

	/*
	 * it's silly to pretend we understand 6-byte sense commands, just
	 * reject with ILLEGAL_REQUEST and the caller should take the
	 * appropriate action
	 */
	if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
		rq->errors = ILLEGAL_REQUEST;
		return BLKPREP_KILL;
	}
	
	return BLKPREP_OK;
}

static int ide_cdrom_prep_fn(request_queue_t *q, struct request *rq)
{
	if (rq->flags & REQ_CMD)
		return ide_cdrom_prep_fs(q, rq);
	else if (rq->flags & REQ_BLOCK_PC)
		return ide_cdrom_prep_pc(rq);

	return 0;
}

static
int ide_cdrom_setup (ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;
	struct cdrom_device_info *cdi = &info->devinfo;
	int nslots;

	blk_queue_prep_rq(drive->queue, ide_cdrom_prep_fn);
	blk_queue_dma_alignment(drive->queue, 31);
	drive->queue->unplug_delay = (1 * HZ) / 1000;
	if (!drive->queue->unplug_delay)
		drive->queue->unplug_delay = 1;

	drive->special.all	= 0;

	CDROM_STATE_FLAGS(drive)->media_changed = 1;
	CDROM_STATE_FLAGS(drive)->toc_valid     = 0;
	CDROM_STATE_FLAGS(drive)->door_locked   = 0;

#if NO_DOOR_LOCKING
	CDROM_CONFIG_FLAGS(drive)->no_doorlock = 1;
#else
	CDROM_CONFIG_FLAGS(drive)->no_doorlock = 0;
#endif

	CDROM_CONFIG_FLAGS(drive)->drq_interrupt = ((drive->id->config & 0x0060) == 0x20);
	CDROM_CONFIG_FLAGS(drive)->is_changer = 0;
	CDROM_CONFIG_FLAGS(drive)->cd_r = 0;
	CDROM_CONFIG_FLAGS(drive)->cd_rw = 0;
	CDROM_CONFIG_FLAGS(drive)->test_write = 0;
	CDROM_CONFIG_FLAGS(drive)->dvd = 0;
	CDROM_CONFIG_FLAGS(drive)->dvd_r = 0;
	CDROM_CONFIG_FLAGS(drive)->dvd_ram = 0;
	CDROM_CONFIG_FLAGS(drive)->no_eject = 1;
	CDROM_CONFIG_FLAGS(drive)->supp_disc_present = 0;
	CDROM_CONFIG_FLAGS(drive)->audio_play = 0;
	CDROM_CONFIG_FLAGS(drive)->close_tray = 1;
	
	/* limit transfer size per interrupt. */
	CDROM_CONFIG_FLAGS(drive)->limit_nframes = 0;
	/* a testament to the nice quality of Samsung drives... */
	if (!strcmp(drive->id->model, "SAMSUNG CD-ROM SCR-2430"))
		CDROM_CONFIG_FLAGS(drive)->limit_nframes = 1;
	else if (!strcmp(drive->id->model, "SAMSUNG CD-ROM SCR-2432"))
		CDROM_CONFIG_FLAGS(drive)->limit_nframes = 1;
	/* the 3231 model does not support the SET_CD_SPEED command */
	else if (!strcmp(drive->id->model, "SAMSUNG CD-ROM SCR-3231"))
		cdi->mask |= CDC_SELECT_SPEED;

#if ! STANDARD_ATAPI
	/* by default Sanyo 3 CD changer support is turned off and
           ATAPI Rev 2.2+ standard support for CD changers is used */
	cdi->sanyo_slot = 0;

	CDROM_CONFIG_FLAGS(drive)->nec260 = 0;
	CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd = 0;
	CDROM_CONFIG_FLAGS(drive)->tocaddr_as_bcd = 0;
	CDROM_CONFIG_FLAGS(drive)->playmsf_as_bcd = 0;
	CDROM_CONFIG_FLAGS(drive)->subchan_as_bcd = 0;

	if (strcmp (drive->id->model, "V003S0DS") == 0 &&
	    drive->id->fw_rev[4] == '1' &&
	    drive->id->fw_rev[6] <= '2') {
		/* Vertos 300.
		   Some versions of this drive like to talk BCD. */
		CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->tocaddr_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->playmsf_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->subchan_as_bcd = 1;
	}

	else if (strcmp (drive->id->model, "V006E0DS") == 0 &&
	    drive->id->fw_rev[4] == '1' &&
	    drive->id->fw_rev[6] <= '2') {
		/* Vertos 600 ESD. */
		CDROM_CONFIG_FLAGS(drive)->toctracks_as_bcd = 1;
	}
	else if (strcmp(drive->id->model, "NEC CD-ROM DRIVE:260") == 0 &&
		 strncmp(drive->id->fw_rev, "1.01", 4) == 0) { /* FIXME */
		/* Old NEC260 (not R).
		   This drive was released before the 1.2 version
		   of the spec. */
		CDROM_CONFIG_FLAGS(drive)->tocaddr_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->playmsf_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->subchan_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->nec260         = 1;
	}
	else if (strcmp(drive->id->model, "WEARNES CDD-120") == 0 &&
		 strncmp(drive->id->fw_rev, "A1.1", 4) == 0) { /* FIXME */
		/* Wearnes */
		CDROM_CONFIG_FLAGS(drive)->playmsf_as_bcd = 1;
		CDROM_CONFIG_FLAGS(drive)->subchan_as_bcd = 1;
	}
        /* Sanyo 3 CD changer uses a non-standard command
           for CD changing */
        else if ((strcmp(drive->id->model, "CD-ROM CDR-C3 G") == 0) ||
                 (strcmp(drive->id->model, "CD-ROM CDR-C3G") == 0) ||
                 (strcmp(drive->id->model, "CD-ROM CDR_C36") == 0)) {
                 /* uses CD in slot 0 when value is set to 3 */
                 cdi->sanyo_slot = 3;
        }
#endif /* not STANDARD_ATAPI */

	info->toc		= NULL;
	info->buffer		= NULL;
	info->sector_buffered	= 0;
	info->nsectors_buffered	= 0;
	info->changer_info      = NULL;
	info->last_block	= 0;
	info->start_seek	= 0;

	nslots = ide_cdrom_probe_capabilities (drive);

	/*
	 * set correct block size
	 */
	blk_queue_hardsect_size(drive->queue, CD_FRAMESIZE);

	if (drive->autotune == IDE_TUNE_DEFAULT ||
	    drive->autotune == IDE_TUNE_AUTO)
		drive->dsc_overlap = (drive->next != drive);
#if 0
	drive->dsc_overlap = (HWIF(drive)->no_dsc) ? 0 : 1;
	if (HWIF(drive)->no_dsc) {
		printk(KERN_INFO "ide-cd: %s: disabling DSC overlap\n",
			drive->name);
		drive->dsc_overlap = 0;
	}
#endif

	if (ide_cdrom_register(drive, nslots)) {
		printk (KERN_ERR "%s: ide_cdrom_setup failed to register device with the cdrom driver.\n", drive->name);
		info->devinfo.handle = NULL;
		return 1;
	}
	ide_cdrom_add_settings(drive);
	return 0;
}

static
sector_t ide_cdrom_capacity (ide_drive_t *drive)
{
	unsigned long capacity, sectors_per_frame;

	if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
		return 0;

	return capacity * sectors_per_frame;
}

static
int ide_cdrom_cleanup(ide_drive_t *drive)
{
	struct cdrom_info *info = drive->driver_data;

	if (ide_unregister_subdriver(drive)) {
		printk(KERN_ERR "%s: %s: failed to ide_unregister_subdriver\n",
			__FUNCTION__, drive->name);
		return 1;
	}

	del_gendisk(info->disk);

	ide_cd_put(info);

	return 0;
}

static void ide_cd_release(struct kref *kref)
{
	struct cdrom_info *info = to_ide_cd(kref);
	struct cdrom_device_info *devinfo = &info->devinfo;
	ide_drive_t *drive = info->drive;
	struct gendisk *g = info->disk;

	if (info->buffer != NULL)
		kfree(info->buffer);
	if (info->toc != NULL)
		kfree(info->toc);
	if (info->changer_info != NULL)
		kfree(info->changer_info);
	if (devinfo->handle == drive && unregister_cdrom(devinfo))
		printk(KERN_ERR "%s: %s failed to unregister device from the cdrom "
				"driver.\n", __FUNCTION__, drive->name);
	drive->dsc_overlap = 0;
	drive->driver_data = NULL;
	blk_queue_prep_rq(drive->queue, NULL);
	g->private_data = NULL;
	put_disk(g);
	kfree(info);
}

static int ide_cdrom_attach (ide_drive_t *drive);

#ifdef CONFIG_PROC_FS
static int proc_idecd_read_capacity
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t*drive = (ide_drive_t *)data;
	int len;

	len = sprintf(page,"%llu\n", (long long)ide_cdrom_capacity(drive));
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

static ide_proc_entry_t idecd_proc[] = {
	{ "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
	{ NULL, 0, NULL, NULL }
};
#else
# define idecd_proc	NULL
#endif

static ide_driver_t ide_cdrom_driver = {
	.owner			= THIS_MODULE,
	.name			= "ide-cdrom",
	.version		= IDECD_VERSION,
	.media			= ide_cdrom,
	.busy			= 0,
	.supports_dsc_overlap	= 1,
	.cleanup		= ide_cdrom_cleanup,
	.do_request		= ide_do_rw_cdrom,
	.end_request		= ide_end_request,
	.error			= __ide_error,
	.abort			= __ide_abort,
	.proc			= idecd_proc,
	.attach			= ide_cdrom_attach,
	.drives			= LIST_HEAD_INIT(ide_cdrom_driver.drives),
};

static int idecd_open(struct inode * inode, struct file * file)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct cdrom_info *info;
	ide_drive_t *drive;
	int rc = -ENOMEM;

	if (!(info = ide_cd_get(disk)))
		return -ENXIO;

	drive = info->drive;

	drive->usage++;

	if (!info->buffer)
		info->buffer = kmalloc(SECTOR_BUFFER_SIZE,
					GFP_KERNEL|__GFP_REPEAT);
        if (!info->buffer || (rc = cdrom_open(&info->devinfo, inode, file)))
		drive->usage--;

	if (rc < 0)
		ide_cd_put(info);

	return rc;
}

static int idecd_release(struct inode * inode, struct file * file)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct cdrom_info *info = ide_cd_g(disk);
	ide_drive_t *drive = info->drive;

	cdrom_release (&info->devinfo, file);
	drive->usage--;

	ide_cd_put(info);

	return 0;
}

static int idecd_ioctl (struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct cdrom_info *info = ide_cd_g(bdev->bd_disk);
	int err;

	err  = generic_ide_ioctl(info->drive, file, bdev, cmd, arg);
	if (err == -EINVAL)
		err = cdrom_ioctl(file, &info->devinfo, inode, cmd, arg);

	return err;
}

static int idecd_media_changed(struct gendisk *disk)
{
	struct cdrom_info *info = ide_cd_g(disk);
	return cdrom_media_changed(&info->devinfo);
}

static int idecd_revalidate_disk(struct gendisk *disk)
{
	struct cdrom_info *info = ide_cd_g(disk);
	struct request_sense sense;
	cdrom_read_toc(info->drive, &sense);
	return  0;
}

static struct block_device_operations idecd_ops = {
	.owner		= THIS_MODULE,
	.open		= idecd_open,
	.release	= idecd_release,
	.ioctl		= idecd_ioctl,
	.media_changed	= idecd_media_changed,
	.revalidate_disk= idecd_revalidate_disk
};

/* options */
static char *ignore = NULL;

module_param(ignore, charp, 0400);
MODULE_DESCRIPTION("ATAPI CD-ROM Driver");

static int ide_cdrom_attach (ide_drive_t *drive)
{
	struct cdrom_info *info;
	struct gendisk *g;
	struct request_sense sense;

	if (!strstr("ide-cdrom", drive->driver_req))
		goto failed;
	if (!drive->present)
		goto failed;
	if (drive->media != ide_cdrom && drive->media != ide_optical)
		goto failed;
	/* skip drives that we were told to ignore */
	if (ignore != NULL) {
		if (strstr(ignore, drive->name)) {
			printk(KERN_INFO "ide-cd: ignoring drive %s\n", drive->name);
			goto failed;
		}
	}
	if (drive->scsi) {
		printk(KERN_INFO "ide-cd: passing drive %s to ide-scsi emulation.\n", drive->name);
		goto failed;
	}
	info = (struct cdrom_info *) kmalloc (sizeof (struct cdrom_info), GFP_KERNEL);
	if (info == NULL) {
		printk(KERN_ERR "%s: Can't allocate a cdrom structure\n", drive->name);
		goto failed;
	}

	g = alloc_disk(1 << PARTN_BITS);
	if (!g)
		goto out_free_cd;

	ide_init_disk(g, drive);

	if (ide_register_subdriver(drive, &ide_cdrom_driver)) {
		printk(KERN_ERR "%s: Failed to register the driver with ide.c\n",
			drive->name);
		goto out_put_disk;
	}
	memset(info, 0, sizeof (struct cdrom_info));

	kref_init(&info->kref);

	info->drive = drive;
	info->driver = &ide_cdrom_driver;
	info->disk = g;

	g->private_data = &info->driver;

	drive->driver_data = info;

	DRIVER(drive)->busy++;
	g->minors = 1;
	snprintf(g->devfs_name, sizeof(g->devfs_name),
			"%s/cd", drive->devfs_name);
	g->driverfs_dev = &drive->gendev;
	g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
	if (ide_cdrom_setup(drive)) {
		struct cdrom_device_info *devinfo = &info->devinfo;
		DRIVER(drive)->busy--;
		ide_unregister_subdriver(drive);
		if (info->buffer != NULL)
			kfree(info->buffer);
		if (info->toc != NULL)
			kfree(info->toc);
		if (info->changer_info != NULL)
			kfree(info->changer_info);
		if (devinfo->handle == drive && unregister_cdrom(devinfo))
			printk (KERN_ERR "%s: ide_cdrom_cleanup failed to unregister device from the cdrom driver.\n", drive->name);
		kfree(info);
		drive->driver_data = NULL;
		goto failed;
	}
	DRIVER(drive)->busy--;

	cdrom_read_toc(drive, &sense);
	g->fops = &idecd_ops;
	g->flags |= GENHD_FL_REMOVABLE;
	add_disk(g);
	return 0;

out_put_disk:
	put_disk(g);
out_free_cd:
	kfree(info);
failed:
	return 1;
}

static void __exit ide_cdrom_exit(void)
{
	ide_unregister_driver(&ide_cdrom_driver);
}
 
static int ide_cdrom_init(void)
{
	ide_register_driver(&ide_cdrom_driver);
	return 0;
}

module_init(ide_cdrom_init);
module_exit(ide_cdrom_exit);
MODULE_LICENSE("GPL");