summaryrefslogtreecommitdiff
path: root/sound/oss/trident.c
blob: 147c816a1f2293914ba3b902dd987180ecb40cae (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
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
/*
 *	OSS driver for Linux 2.[46].x for
 *
 *	Trident 4D-Wave
 *	SiS 7018
 *	ALi 5451
 *	Tvia/IGST CyberPro 5050
 *
 *	Driver: Alan Cox <alan@redhat.com>
 *
 *  Built from:
 *	Low level code: <audio@tridentmicro.com> from ALSA
 *	Framework: Thomas Sailer <sailer@ife.ee.ethz.ch>
 *	Extended by: Zach Brown <zab@redhat.com>  
 *
 *  Hacked up by:
 *	Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
 *	Ollie Lho <ollie@sis.com.tw> SiS 7018 Audio Core Support
 *	Ching-Ling Lee <cling-li@ali.com.tw> ALi 5451 Audio Core Support 
 *	Matt Wu <mattwu@acersoftech.com.cn> ALi 5451 Audio Core Support
 *	Peter W�chtler <pwaechtler@loewe-komp.de> CyberPro5050 support
 *      Muli Ben-Yehuda <mulix@mulix.org>
 *
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  History
 *  v0.14.10j
 *  	January 3 2004 Eugene Teo <eugeneteo@eugeneteo.net>
 *  	minor cleanup to use pr_debug instead of TRDBG since it is already
 *  	defined in linux/kernel.h.
 *  v0.14.10i
 *      December 29 2003 Muli Ben-Yehuda <mulix@mulix.org>
 *      major cleanup for 2.6, fix a few error patch buglets
 *      with returning without properly cleaning up first,
 *      get rid of lock_kernel().
 *  v0.14.10h
 *	Sept 10 2002 Pascal Schmidt <der.eremit@email.de>
 *	added support for ALi 5451 joystick port
 *  v0.14.10g
 *	Sept 05 2002 Alan Cox <alan@redhat.com>
 *	adapt to new pci joystick attachment interface
 *  v0.14.10f
 *      July 24 2002 Muli Ben-Yehuda <mulix@actcom.co.il>
 *      patch from Eric Lemar (via Ian Soboroff): in suspend and resume, 
 *      fix wrong cast from pci_dev* to struct trident_card*. 
 *  v0.14.10e
 *      July 19 2002 Muli Ben-Yehuda <mulix@actcom.co.il>
 *      rewrite the DMA buffer allocation/deallcoation functions, to make it 
 *      modular and fix a bug where we would call free_pages on memory 
 *      obtained with pci_alloc_consistent. Also remove unnecessary #ifdef 
 *      CONFIG_PROC_FS and various other cleanups.
 *  v0.14.10d
 *      July 19 2002 Muli Ben-Yehuda <mulix@actcom.co.il>
 *      made several printk(KERN_NOTICE...) into TRDBG(...), to avoid spamming
 *      my syslog with hundreds of messages. 
 *  v0.14.10c
 *      July 16 2002 Muli Ben-Yehuda <mulix@actcom.co.il>
 *      Cleaned up Lei Hu's 0.4.10 driver to conform to Documentation/CodingStyle
 *      and the coding style used in the rest of the file. 
 *  v0.14.10b
 *      June 23 2002 Muli Ben-Yehuda <mulix@actcom.co.il>
 *      add a missing unlock_set_fmt, remove a superflous lock/unlock pair 
 *      with nothing in between. 
 *  v0.14.10a
 *      June 21 2002 Muli Ben-Yehuda <mulix@actcom.co.il> 
 *      use a debug macro instead of #ifdef CONFIG_DEBUG, trim to 80 columns 
 *      per line, use 'do {} while (0)' in statement macros. 
 *  v0.14.10
 *      June 6 2002 Lei Hu <Lei_hu@ali.com.tw>
 *      rewrite the part to read/write registers of audio codec for Ali5451 
 *  v0.14.9e
 *      January 2 2002 Vojtech Pavlik <vojtech@ucw.cz> added gameport
 *      support to avoid resource conflict with pcigame.c
 *  v0.14.9d
 *  	October 8 2001 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *	use set_current_state, properly release resources on failure in
 *	trident_probe, get rid of check_region
 *  v0.14.9c
 *	August 10 2001 Peter W�chtler <pwaechtler@loewe-komp.de>
 *	added support for Tvia (formerly Integraphics/IGST) CyberPro5050
 *	this chip is often found in settop boxes (combined video+audio)
 *  v0.14.9b
 *	Switch to static inline not extern inline (gcc 3)
 *  v0.14.9a
 *	Aug 6 2001 Alan Cox
 *	0.14.9 crashed on rmmod due to a timer/bh left running. Simplified
 *	the existing logic (the BH doesn't help as ac97 is lock_irqsave)
 *	and used del_timer_sync to clean up
 *	Fixed a problem where the ALi change broke my generic card
 *  v0.14.9
 *	Jul 10 2001 Matt Wu
 *	Add H/W Volume Control
 *  v0.14.8a
 *	July 7 2001 Alan Cox
 *	Moved Matt Wu's ac97 register cache into the card structure
 *  v0.14.8
 *	Apr 30 2001 Matt Wu
 *	Set EBUF1 and EBUF2 to still mode
 *	Add dc97/ac97 reset function
 *	Fix power management: ali_restore_regs
 *  unreleased 
 *	Mar 09 2001 Matt Wu
 *	Add cache for ac97 access
 *  v0.14.7
 *	Feb 06 2001 Matt Wu
 *	Fix ac97 initialization
 *	Fix bug: an extra tail will be played when playing
 *	Jan 05 2001 Matt Wu
 *	Implement multi-channels and S/PDIF in support for ALi 1535+
 *  v0.14.6 
 *	Nov 1 2000 Ching-Ling Lee
 *	Fix the bug of memory leak when switching 5.1-channels to 2 channels.
 *	Add lock protection into dynamic changing format of data.
 *	Oct 18 2000 Ching-Ling Lee
 *	5.1-channels support for ALi
 *	June 28 2000 Ching-Ling Lee
 *	S/PDIF out/in(playback/record) support for ALi 1535+, using /proc to be selected by user
 *	Simple Power Management support for ALi
 *  v0.14.5 May 23 2000 Ollie Lho
 *  	Misc bug fix from the Net
 *  v0.14.4 May 20 2000 Aaron Holtzman
 *  	Fix kfree'd memory access in release
 *  	Fix race in open while looking for a free virtual channel slot
 *  	remove open_wait wq (which appears to be unused)
 *  v0.14.3 May 10 2000 Ollie Lho
 *	fixed a small bug in trident_update_ptr, xmms 1.0.1 no longer uses 100% CPU
 *  v0.14.2 Mar 29 2000 Ching-Ling Lee
 *	Add clear to silence advance in trident_update_ptr 
 *	fix invalid data of the end of the sound
 *  v0.14.1 Mar 24 2000 Ching-Ling Lee
 *	ALi 5451 support added, playback and recording O.K.
 *	ALi 5451 originally developed and structured based on sonicvibes, and
 *	suggested to merge into this file by Alan Cox.
 *  v0.14 Mar 15 2000 Ollie Lho
 *	5.1 channel output support with channel binding. What's the Matrix ?
 *  v0.13.1 Mar 10 2000 Ollie Lho
 *	few minor bugs on dual codec support, needs more testing
 *  v0.13 Mar 03 2000 Ollie Lho
 *	new pci_* for 2.4 kernel, back ported to 2.2
 *  v0.12 Feb 23 2000 Ollie Lho
 *	Preliminary Recording support
 *  v0.11.2 Feb 19 2000 Ollie Lho
 *	removed incomplete full-dulplex support
 *  v0.11.1 Jan 28 2000 Ollie Lho
 *	small bug in setting sample rate for 4d-nx (reported by Aaron)
 *  v0.11 Jan 27 2000 Ollie Lho
 *	DMA bug, scheduler latency, second try
 *  v0.10 Jan 24 2000 Ollie Lho
 *	DMA bug fixed, found kernel scheduling problem
 *  v0.09 Jan 20 2000 Ollie Lho
 *	Clean up of channel register access routine (prepare for channel binding)
 *  v0.08 Jan 14 2000 Ollie Lho
 *	Isolation of AC97 codec code
 *  v0.07 Jan 13 2000 Ollie Lho
 *	Get rid of ugly old low level access routines (e.g. CHRegs.lp****)
 *  v0.06 Jan 11 2000 Ollie Lho
 *	Preliminary support for dual (more ?) AC97 codecs
 *  v0.05 Jan 08 2000 Luca Montecchiani <m.luca@iname.com>
 *	adapt to 2.3.x new __setup/__init call
 *  v0.04 Dec 31 1999 Ollie Lho
 *	Multiple Open, using Middle Loop Interrupt to smooth playback
 *  v0.03 Dec 24 1999 Ollie Lho
 *	mem leak in prog_dmabuf and dealloc_dmabuf removed
 *  v0.02 Dec 15 1999 Ollie Lho
 *	SiS 7018 support added, playback O.K.
 *  v0.01 Alan Cox et. al.
 *	Initial Release in kernel 2.3.30, does not work
 * 
 *  ToDo
 *	Clean up of low level channel register access code. (done)
 *	Fix the bug on dma buffer management in update_ptr, read/write, drain_dac (done)
 *	Dual AC97 codecs support (done)
 *	Recording support (done)
 *	Mmap support
 *	"Channel Binding" ioctl extension (done)
 *	new pci device driver interface for 2.4 kernel (done)
 *
 *	Lock order (high->low)
 *		lock	-	hardware lock
 *		open_mutex - 	guard opens
 *		sem	-	guard dmabuf, write re-entry etc
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/slab.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/gameport.h>
#include <linux/kernel.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/dma.h>

#if defined(CONFIG_ALPHA_NAUTILUS) || defined(CONFIG_ALPHA_GENERIC)
#include <asm/hwrpb.h>
#endif

#include "trident.h"

#define DRIVER_VERSION "0.14.10j-2.6"

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#endif

/* magic numbers to protect our data structures */
#define TRIDENT_CARD_MAGIC	0x5072696E	/* "Prin" */
#define TRIDENT_STATE_MAGIC	0x63657373	/* "cess" */

#define TRIDENT_DMA_MASK	0x3fffffff	/* DMA buffer mask for pci_alloc_consist */
#define ALI_DMA_MASK		0x7fffffff	/* ALI Tridents have 31-bit DMA. Wow. */

#define NR_HW_CH		32

/* maximum number of AC97 codecs connected, AC97 2.0 defined 4, but 7018 and 4D-NX only
   have 2 SDATA_IN lines (currently) */
#define NR_AC97		2

/* minor number of /dev/swmodem (temporary, experimental) */
#define SND_DEV_SWMODEM	7

static const unsigned ali_multi_channels_5_1[] = {
	/*ALI_SURR_LEFT_CHANNEL, ALI_SURR_RIGHT_CHANNEL, */
	ALI_CENTER_CHANNEL,
	ALI_LEF_CHANNEL,
	ALI_SURR_LEFT_CHANNEL,
	ALI_SURR_RIGHT_CHANNEL
};

static const unsigned sample_size[] = { 1, 2, 2, 4 };
static const unsigned sample_shift[] = { 0, 1, 1, 2 };

static const char invalid_magic[] = KERN_CRIT "trident: invalid magic value in %s\n";

enum {
	TRIDENT_4D_DX = 0,
	TRIDENT_4D_NX,
	SIS_7018,
	ALI_5451,
	CYBER5050
};

static char *card_names[] = {
	"Trident 4DWave DX",
	"Trident 4DWave NX",
	"SiS 7018 PCI Audio",
	"ALi Audio Accelerator",
	"Tvia/IGST CyberPro 5050"
};

static struct pci_device_id trident_pci_tbl[] = {
	{PCI_DEVICE(PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_TRIDENT_4DWAVE_DX),
		PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, TRIDENT_4D_DX},
	{PCI_DEVICE(PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_TRIDENT_4DWAVE_NX),
		0, 0, TRIDENT_4D_NX},
	{PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_7018), 0, 0, SIS_7018},
	{PCI_DEVICE(PCI_VENDOR_ID_ALI, PCI_DEVICE_ID_ALI_5451), 0, 0, ALI_5451},
	{PCI_DEVICE(PCI_VENDOR_ID_INTERG, PCI_DEVICE_ID_INTERG_5050),
		0, 0, CYBER5050},
	{0,}
};

MODULE_DEVICE_TABLE(pci, trident_pci_tbl);

/* "software" or virtual channel, an instance of opened /dev/dsp */
struct trident_state {
	unsigned int magic;
	struct trident_card *card;	/* Card info */

	/* file mode */
	mode_t open_mode;

	/* virtual channel number */
	int virt;

	struct dmabuf {
		/* wave sample stuff */
		unsigned int rate;
		unsigned char fmt, enable;

		/* hardware channel */
		struct trident_channel *channel;

		/* OSS buffer management stuff */
		void *rawbuf;
		dma_addr_t dma_handle;
		unsigned buforder;
		unsigned numfrag;
		unsigned fragshift;

		/* our buffer acts like a circular ring */
		unsigned hwptr;	/* where dma last started, updated by update_ptr */
		unsigned swptr;	/* where driver last clear/filled, updated by read/write */
		int count;	/* bytes to be comsumed or been generated by dma machine */
		unsigned total_bytes;	/* total bytes dmaed by hardware */

		unsigned error;	/* number of over/underruns */
                /* put process on wait queue when no more space in buffer */
		wait_queue_head_t wait;	

		/* redundant, but makes calculations easier */
		unsigned fragsize;
		unsigned dmasize;
		unsigned fragsamples;

		/* OSS stuff */
		unsigned mapped:1;
		unsigned ready:1;
		unsigned endcleared:1;
		unsigned update_flag;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;

	} dmabuf;

	/* 5.1 channels */
	struct trident_state *other_states[4];
	int multi_channels_adjust_count;
	unsigned chans_num;
	unsigned long fmt_flag;
	/* Guard against mmap/write/read races */
	struct mutex sem;

};

/* hardware channels */
struct trident_channel {
	int num; /* channel number */
	u32 lba; /* Loop Begine Address, where dma buffer starts */
	u32 eso; /* End Sample Offset, wehre dma buffer ends */ 
	         /* (in the unit of samples) */
	u32 delta; /* delta value, sample rate / 48k for playback, */
	           /* 48k/sample rate for recording */
	u16 attribute; /* control where PCM data go and come  */
	u16 fm_vol;
	u32 control; /* signed/unsigned, 8/16 bits, mono/stereo */
};

struct trident_pcm_bank_address {
	u32 start;
	u32 stop;
	u32 aint;
	u32 aint_en;
};

static struct trident_pcm_bank_address bank_a_addrs = {
	T4D_START_A,
	T4D_STOP_A,
	T4D_AINT_A,
	T4D_AINTEN_A
};

static struct trident_pcm_bank_address bank_b_addrs = {
	T4D_START_B,
	T4D_STOP_B,
	T4D_AINT_B,
	T4D_AINTEN_B
};

struct trident_pcm_bank {
	/* register addresses to control bank operations */
	struct trident_pcm_bank_address *addresses;
	/* each bank has 32 channels */
	u32 bitmap;		/* channel allocation bitmap */
	struct trident_channel channels[32];
};

struct trident_card {
	unsigned int magic;

	/* We keep trident cards in a linked list */
	struct trident_card *next;

	/* single open lock mechanism, only used for recording */
	struct mutex open_mutex;

	/* The trident has a certain amount of cross channel interaction
	   so we use a single per card lock */
	spinlock_t lock;

	/* PCI device stuff */
	struct pci_dev *pci_dev;
	u16 pci_id;
	u8 revision;

	/* soundcore stuff */
	int dev_audio;

	/* structures for abstraction of hardware facilities, codecs, */ 
	/* banks and channels */
	struct ac97_codec *ac97_codec[NR_AC97];
	struct trident_pcm_bank banks[NR_BANKS];
	struct trident_state *states[NR_HW_CH];

	/* hardware resources */
	unsigned long iobase;
	u32 irq;

	/* Function support */
	struct trident_channel *(*alloc_pcm_channel) (struct trident_card *);
	struct trident_channel *(*alloc_rec_pcm_channel) (struct trident_card *);
	void (*free_pcm_channel) (struct trident_card *, unsigned int chan);
	void (*address_interrupt) (struct trident_card *);

	/* Added by Matt Wu 01-05-2001 for spdif in */
	int multi_channel_use_count;
	int rec_channel_use_count;
	u16 mixer_regs[64][NR_AC97];	/* Made card local by Alan */
	int mixer_regs_ready;

	/* Added for hardware volume control */
	int hwvolctl;
	struct timer_list timer;

	/* Game port support */
	struct gameport *gameport;
};

enum dmabuf_mode {
	DM_PLAYBACK = 0,
	DM_RECORD
};

/* table to map from CHANNELMASK to channel attribute for SiS 7018 */
static u16 mask2attr[] = {
	PCM_LR, PCM_LR, SURR_LR, CENTER_LFE,
	HSET, MIC, MODEM_LINE1, MODEM_LINE2,
	I2S_LR, SPDIF_LR
};

/* table to map from channel attribute to CHANNELMASK for SiS 7018 */
static int attr2mask[] = {
	DSP_BIND_MODEM1, DSP_BIND_MODEM2, DSP_BIND_FRONT, DSP_BIND_HANDSET,
	DSP_BIND_I2S, DSP_BIND_CENTER_LFE, DSP_BIND_SURR, DSP_BIND_SPDIF
};

/* Added by Matt Wu 01-05-2001 for spdif in */
static int ali_close_multi_channels(void);
static void ali_delay(struct trident_card *card, int interval);
static void ali_detect_spdif_rate(struct trident_card *card);

static void ali_ac97_write(struct ac97_codec *codec, u8 reg, u16 val);
static u16 ali_ac97_read(struct ac97_codec *codec, u8 reg);

static struct trident_card *devs;

static void trident_ac97_set(struct ac97_codec *codec, u8 reg, u16 val);
static u16 trident_ac97_get(struct ac97_codec *codec, u8 reg);

static int trident_open_mixdev(struct inode *inode, struct file *file);
static int trident_ioctl_mixdev(struct inode *inode, struct file *file, 
				unsigned int cmd, unsigned long arg);

static void ali_ac97_set(struct trident_card *card, int secondary, u8 reg, u16 val);
static u16 ali_ac97_get(struct trident_card *card, int secondary, u8 reg);
static void ali_set_spdif_out_rate(struct trident_card *card, unsigned int rate);
static void ali_enable_special_channel(struct trident_state *stat);
static struct trident_channel *ali_alloc_rec_pcm_channel(struct trident_card *card);
static struct trident_channel *ali_alloc_pcm_channel(struct trident_card *card);
static void ali_free_pcm_channel(struct trident_card *card, unsigned int channel);
static int ali_setup_multi_channels(struct trident_card *card, int chan_nums);
static unsigned int ali_get_spdif_in_rate(struct trident_card *card);
static void ali_setup_spdif_in(struct trident_card *card);
static void ali_disable_spdif_in(struct trident_card *card);
static void ali_disable_special_channel(struct trident_card *card, int ch);
static void ali_setup_spdif_out(struct trident_card *card, int flag);
static int ali_write_5_1(struct trident_state *state,
			 const char __user *buffer, 
			 int cnt_for_multi_channel, unsigned int *copy_count, 
			 unsigned int *state_cnt);
static int ali_allocate_other_states_resources(struct trident_state *state, 
					       int chan_nums);
static void ali_free_other_states_resources(struct trident_state *state);

#define seek_offset(dma_ptr, buffer, cnt, offset, copy_count)	do { \
        (dma_ptr) += (offset);	  \
	(buffer) += (offset);	  \
        (cnt) -= (offset);	  \
	(copy_count) += (offset); \
} while (0)

static inline int lock_set_fmt(struct trident_state* state)
{
	if (test_and_set_bit(0, &state->fmt_flag))
		return -EFAULT;

	return 0;
}

static inline void unlock_set_fmt(struct trident_state* state)
{
	clear_bit(0, &state->fmt_flag);
}

static int
trident_enable_loop_interrupts(struct trident_card *card)
{
	u32 global_control;

	global_control = inl(TRID_REG(card, T4D_LFO_GC_CIR));

	switch (card->pci_id) {
	case PCI_DEVICE_ID_SI_7018:
		global_control |= (ENDLP_IE | MIDLP_IE | BANK_B_EN);
		break;
	case PCI_DEVICE_ID_ALI_5451:
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
	case PCI_DEVICE_ID_INTERG_5050:
		global_control |= (ENDLP_IE | MIDLP_IE);
		break;
	default:
		return 0;
	}

	outl(global_control, TRID_REG(card, T4D_LFO_GC_CIR));

	pr_debug("trident: Enable Loop Interrupts, globctl = 0x%08X\n",
		 inl(TRID_REG(card, T4D_LFO_GC_CIR)));

	return 1;
}

static int
trident_disable_loop_interrupts(struct trident_card *card)
{
	u32 global_control;

	global_control = inl(TRID_REG(card, T4D_LFO_GC_CIR));
	global_control &= ~(ENDLP_IE | MIDLP_IE);
	outl(global_control, TRID_REG(card, T4D_LFO_GC_CIR));

	pr_debug("trident: Disabled Loop Interrupts, globctl = 0x%08X\n",
		 global_control);

	return 1;
}

static void
trident_enable_voice_irq(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 reg, addr = bank->addresses->aint_en;

	reg = inl(TRID_REG(card, addr));
	reg |= mask;
	outl(reg, TRID_REG(card, addr));

#ifdef DEBUG
	reg = inl(TRID_REG(card, addr));
	pr_debug("trident: enabled IRQ on channel %d, %s = 0x%08x(addr:%X)\n",
		 channel, addr == T4D_AINTEN_B ? "AINTEN_B" : "AINTEN_A",
		 reg, addr);
#endif /* DEBUG */
}

static void
trident_disable_voice_irq(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 reg, addr = bank->addresses->aint_en;

	reg = inl(TRID_REG(card, addr));
	reg &= ~mask;
	outl(reg, TRID_REG(card, addr));

	/* Ack the channel in case the interrupt was set before we disable it. */
	outl(mask, TRID_REG(card, bank->addresses->aint));

#ifdef DEBUG
	reg = inl(TRID_REG(card, addr));
	pr_debug("trident: disabled IRQ on channel %d, %s = 0x%08x(addr:%X)\n",
		 channel, addr == T4D_AINTEN_B ? "AINTEN_B" : "AINTEN_A",
		 reg, addr);
#endif /* DEBUG */
}

static void
trident_start_voice(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 addr = bank->addresses->start;

#ifdef DEBUG
	u32 reg;
#endif /* DEBUG */

	outl(mask, TRID_REG(card, addr));

#ifdef DEBUG
	reg = inl(TRID_REG(card, addr));
	pr_debug("trident: start voice on channel %d, %s = 0x%08x(addr:%X)\n",
		 channel, addr == T4D_START_B ? "START_B" : "START_A",
		 reg, addr);
#endif /* DEBUG */
}

static void
trident_stop_voice(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 addr = bank->addresses->stop;

#ifdef DEBUG
	u32 reg;
#endif /* DEBUG */

	outl(mask, TRID_REG(card, addr));

#ifdef DEBUG
	reg = inl(TRID_REG(card, addr));
	pr_debug("trident: stop voice on channel %d, %s = 0x%08x(addr:%X)\n",
		 channel, addr == T4D_STOP_B ? "STOP_B" : "STOP_A",
		 reg, addr);
#endif /* DEBUG */
}

static u32
trident_get_interrupt_mask(struct trident_card *card, unsigned int channel)
{
	struct trident_pcm_bank *bank = &card->banks[channel];
	u32 addr = bank->addresses->aint;
	return inl(TRID_REG(card, addr));
}

static int
trident_check_channel_interrupt(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	u32 reg = trident_get_interrupt_mask(card, channel >> 5);

#ifdef DEBUG
	if (reg & mask)
		pr_debug("trident: channel %d has interrupt, %s = 0x%08x\n",
			 channel, reg == T4D_AINT_B ? "AINT_B" : "AINT_A",
			 reg);
#endif /* DEBUG */
	return (reg & mask) ? 1 : 0;
}

static void
trident_ack_channel_interrupt(struct trident_card *card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 reg, addr = bank->addresses->aint;

	reg = inl(TRID_REG(card, addr));
	reg &= mask;
	outl(reg, TRID_REG(card, addr));

#ifdef DEBUG
	reg = inl(TRID_REG(card, T4D_AINT_B));
	pr_debug("trident: Ack channel %d interrupt, AINT_B = 0x%08x\n",
		 channel, reg);
#endif /* DEBUG */
}

static struct trident_channel *
trident_alloc_pcm_channel(struct trident_card *card)
{
	struct trident_pcm_bank *bank;
	int idx;

	bank = &card->banks[BANK_B];

	for (idx = 31; idx >= 0; idx--) {
		if (!(bank->bitmap & (1 << idx))) {
			struct trident_channel *channel = &bank->channels[idx];
			bank->bitmap |= 1 << idx;
			channel->num = idx + 32;
			return channel;
		}
	}

	/* no more free channels available */
	printk(KERN_ERR "trident: no more channels available on Bank B.\n");
	return NULL;
}

static void
trident_free_pcm_channel(struct trident_card *card, unsigned int channel)
{
	int bank;
	unsigned char b;

	if (channel < 31 || channel > 63)
		return;

	if (card->pci_id == PCI_DEVICE_ID_TRIDENT_4DWAVE_DX || 
	    card->pci_id == PCI_DEVICE_ID_TRIDENT_4DWAVE_NX) {
		b = inb(TRID_REG(card, T4D_REC_CH));
		if ((b & ~0x80) == channel)
			outb(0x0, TRID_REG(card, T4D_REC_CH));
	}

	bank = channel >> 5;
	channel = channel & 0x1f;

	card->banks[bank].bitmap &= ~(1 << (channel));
}

static struct trident_channel *
cyber_alloc_pcm_channel(struct trident_card *card)
{
	struct trident_pcm_bank *bank;
	int idx;

	/* The cyberpro 5050 has only 32 voices and one bank */
	/* .. at least they are not documented (if you want to call that 
	 * crap documentation), perhaps broken ? */

	bank = &card->banks[BANK_A];

	for (idx = 31; idx >= 0; idx--) {
		if (!(bank->bitmap & (1 << idx))) {
			struct trident_channel *channel = &bank->channels[idx];
			bank->bitmap |= 1 << idx;
			channel->num = idx;
			return channel;
		}
	}

	/* no more free channels available */
	printk(KERN_ERR "cyberpro5050: no more channels available on Bank A.\n");
	return NULL;
}

static void
cyber_free_pcm_channel(struct trident_card *card, unsigned int channel)
{
	if (channel > 31)
		return;
	card->banks[BANK_A].bitmap &= ~(1 << (channel));
}

static inline void
cyber_outidx(int port, int idx, int data)
{
	outb(idx, port);
	outb(data, port + 1);
}

static inline int
cyber_inidx(int port, int idx)
{
	outb(idx, port);
	return inb(port + 1);
}

static int
cyber_init_ritual(struct trident_card *card)
{
	/* some black magic, taken from SDK samples */
	/* remove this and nothing will work */
	int portDat;
	int ret = 0;
	unsigned long flags;

	/*
	 *      Keep interrupts off for the configure - we don't want to
	 *      clash with another cyberpro config event
	 */

	spin_lock_irqsave(&card->lock, flags);
	portDat = cyber_inidx(CYBER_PORT_AUDIO, CYBER_IDX_AUDIO_ENABLE);
	/* enable, if it was disabled */
	if ((portDat & CYBER_BMSK_AUENZ) != CYBER_BMSK_AUENZ_ENABLE) {
		printk(KERN_INFO "cyberpro5050: enabling audio controller\n");
		cyber_outidx(CYBER_PORT_AUDIO, CYBER_IDX_AUDIO_ENABLE, 
			     portDat | CYBER_BMSK_AUENZ_ENABLE);
		/* check again if hardware is enabled now */
		portDat = cyber_inidx(CYBER_PORT_AUDIO, CYBER_IDX_AUDIO_ENABLE);
	}
	if ((portDat & CYBER_BMSK_AUENZ) != CYBER_BMSK_AUENZ_ENABLE) {
		printk(KERN_ERR "cyberpro5050: initAudioAccess: no success\n");
		ret = -1;
	} else {
		cyber_outidx(CYBER_PORT_AUDIO, CYBER_IDX_IRQ_ENABLE, 
			     CYBER_BMSK_AUDIO_INT_ENABLE);
		cyber_outidx(CYBER_PORT_AUDIO, 0xbf, 0x01);
		cyber_outidx(CYBER_PORT_AUDIO, 0xba, 0x20);
		cyber_outidx(CYBER_PORT_AUDIO, 0xbb, 0x08);
		cyber_outidx(CYBER_PORT_AUDIO, 0xbf, 0x02);
		cyber_outidx(CYBER_PORT_AUDIO, 0xb3, 0x06);
		cyber_outidx(CYBER_PORT_AUDIO, 0xbf, 0x00);
	}
	spin_unlock_irqrestore(&card->lock, flags);
	return ret;
}

/*  called with spin lock held */

static int
trident_load_channel_registers(struct trident_card *card, u32 * data, 
			       unsigned int channel)
{
	int i;

	if (channel > 63)
		return 0;

	/* select hardware channel to write */
	outb(channel, TRID_REG(card, T4D_LFO_GC_CIR));

	/* Output the channel registers, but don't write register
	   three to an ALI chip. */
	for (i = 0; i < CHANNEL_REGS; i++) {
		if (i == 3 && card->pci_id == PCI_DEVICE_ID_ALI_5451)
			continue;
		outl(data[i], TRID_REG(card, CHANNEL_START + 4 * i));
	}
	if (card->pci_id == PCI_DEVICE_ID_ALI_5451 || 
	    card->pci_id == PCI_DEVICE_ID_INTERG_5050) {
		outl(ALI_EMOD_Still, TRID_REG(card, ALI_EBUF1));
		outl(ALI_EMOD_Still, TRID_REG(card, ALI_EBUF2));
	}
	return 1;
}

/* called with spin lock held */
static int
trident_write_voice_regs(struct trident_state *state)
{
	unsigned int data[CHANNEL_REGS + 1];
	struct trident_channel *channel;

	channel = state->dmabuf.channel;

	data[1] = channel->lba;
	data[4] = channel->control;

	switch (state->card->pci_id) {
	case PCI_DEVICE_ID_ALI_5451:
		data[0] = 0;	/* Current Sample Offset */
		data[2] = (channel->eso << 16) | (channel->delta & 0xffff);
		data[3] = 0;
		break;
	case PCI_DEVICE_ID_SI_7018:
	case PCI_DEVICE_ID_INTERG_5050:
		data[0] = 0;	/* Current Sample Offset */
		data[2] = (channel->eso << 16) | (channel->delta & 0xffff);
		data[3] = (channel->attribute << 16) | (channel->fm_vol & 0xffff);
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
		data[0] = 0;	/* Current Sample Offset */
		data[2] = (channel->eso << 16) | (channel->delta & 0xffff);
		data[3] = channel->fm_vol & 0xffff;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		data[0] = (channel->delta << 24);
		data[2] = ((channel->delta << 16) & 0xff000000) | 
			(channel->eso & 0x00ffffff);
		data[3] = channel->fm_vol & 0xffff;
		break;
	default:
		return 0;
	}

	return trident_load_channel_registers(state->card, data, channel->num);
}

static int
compute_rate_play(u32 rate)
{
	int delta;
	/* We special case 44100 and 8000 since rounding with the equation
	   does not give us an accurate enough value. For 11025 and 22050
	   the equation gives us the best answer. All other frequencies will
	   also use the equation. JDW */
	if (rate == 44100)
		delta = 0xeb3;
	else if (rate == 8000)
		delta = 0x2ab;
	else if (rate == 48000)
		delta = 0x1000;
	else
		delta = (((rate << 12) + rate) / 48000) & 0x0000ffff;
	return delta;
}

static int
compute_rate_rec(u32 rate)
{
	int delta;

	if (rate == 44100)
		delta = 0x116a;
	else if (rate == 8000)
		delta = 0x6000;
	else if (rate == 48000)
		delta = 0x1000;
	else
		delta = ((48000 << 12) / rate) & 0x0000ffff;

	return delta;
}

/* set playback sample rate */
static unsigned int
trident_set_dac_rate(struct trident_state *state, unsigned int rate)
{
	struct dmabuf *dmabuf = &state->dmabuf;

	if (rate > 48000)
		rate = 48000;
	if (rate < 4000)
		rate = 4000;

	dmabuf->rate = rate;
	dmabuf->channel->delta = compute_rate_play(rate);

	trident_write_voice_regs(state);

	pr_debug("trident: called trident_set_dac_rate : rate = %d\n", rate);

	return rate;
}

/* set recording sample rate */
static unsigned int
trident_set_adc_rate(struct trident_state *state, unsigned int rate)
{
	struct dmabuf *dmabuf = &state->dmabuf;

	if (rate > 48000)
		rate = 48000;
	if (rate < 4000)
		rate = 4000;

	dmabuf->rate = rate;
	dmabuf->channel->delta = compute_rate_rec(rate);

	trident_write_voice_regs(state);

	pr_debug("trident: called trident_set_adc_rate : rate = %d\n", rate);

	return rate;
}

/* prepare channel attributes for playback */
static void
trident_play_setup(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	struct trident_channel *channel = dmabuf->channel;

	channel->lba = dmabuf->dma_handle;
	channel->delta = compute_rate_play(dmabuf->rate);

	channel->eso = dmabuf->dmasize >> sample_shift[dmabuf->fmt];
	channel->eso -= 1;

	if (state->card->pci_id != PCI_DEVICE_ID_SI_7018) {
		channel->attribute = 0;
		if (state->card->pci_id == PCI_DEVICE_ID_ALI_5451) {
			if ((channel->num == ALI_SPDIF_IN_CHANNEL) || 
			    (channel->num == ALI_PCM_IN_CHANNEL))
				ali_disable_special_channel(state->card, channel->num);
			else if ((inl(TRID_REG(state->card, ALI_GLOBAL_CONTROL)) 
				  & ALI_SPDIF_OUT_CH_ENABLE)
				 && (channel->num == ALI_SPDIF_OUT_CHANNEL)) {
				ali_set_spdif_out_rate(state->card, 
						       state->dmabuf.rate);
				state->dmabuf.channel->delta = 0x1000;
			}
		}
	}

	channel->fm_vol = 0x0;

	channel->control = CHANNEL_LOOP;
	if (dmabuf->fmt & TRIDENT_FMT_16BIT) {
		/* 16-bits */
		channel->control |= CHANNEL_16BITS;
		/* signed */
		channel->control |= CHANNEL_SIGNED;
	}
	if (dmabuf->fmt & TRIDENT_FMT_STEREO)
		/* stereo */
		channel->control |= CHANNEL_STEREO;

	pr_debug("trident: trident_play_setup, LBA = 0x%08x, Delta = 0x%08x, "
		 "ESO = 0x%08x, Control = 0x%08x\n", channel->lba,
		 channel->delta, channel->eso, channel->control);

	trident_write_voice_regs(state);
}

/* prepare channel attributes for recording */
static void
trident_rec_setup(struct trident_state *state)
{
	u16 w;
	u8 bval;

	struct trident_card *card = state->card;
	struct dmabuf *dmabuf = &state->dmabuf;
	struct trident_channel *channel = dmabuf->channel;
	unsigned int rate;

	/* Enable AC-97 ADC (capture) */
	switch (card->pci_id) {
	case PCI_DEVICE_ID_ALI_5451:
		ali_enable_special_channel(state);
		break;
	case PCI_DEVICE_ID_SI_7018:
		/* for 7018, the ac97 is always in playback/record (duplex) mode */
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
		w = inb(TRID_REG(card, DX_ACR2_AC97_COM_STAT));
		outb(w | 0x48, TRID_REG(card, DX_ACR2_AC97_COM_STAT));
		/* enable and set record channel */
		outb(0x80 | channel->num, TRID_REG(card, T4D_REC_CH));
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		w = inw(TRID_REG(card, T4D_MISCINT));
		outw(w | 0x1000, TRID_REG(card, T4D_MISCINT));
		/* enable and set record channel */
		outb(0x80 | channel->num, TRID_REG(card, T4D_REC_CH));
		break;
	case PCI_DEVICE_ID_INTERG_5050:
		/* don't know yet, using special channel 22 in GC1(0xd4)? */
		break;
	default:
		return;
	}

	channel->lba = dmabuf->dma_handle;
	channel->delta = compute_rate_rec(dmabuf->rate);
	if ((card->pci_id == PCI_DEVICE_ID_ALI_5451) && 
	    (channel->num == ALI_SPDIF_IN_CHANNEL)) {
		rate = ali_get_spdif_in_rate(card);
		if (rate == 0) {
			printk(KERN_WARNING "trident: ALi 5451 "
			       "S/PDIF input setup error!\n");
			rate = 48000;
		}
		bval = inb(TRID_REG(card, ALI_SPDIF_CTRL));
		if (bval & 0x10) {
			outb(bval, TRID_REG(card, ALI_SPDIF_CTRL));
			printk(KERN_WARNING "trident: cleared ALi "
			       "5451 S/PDIF parity error flag.\n");
		}

		if (rate != 48000)
			channel->delta = ((rate << 12) / dmabuf->rate) & 0x0000ffff;
	}

	channel->eso = dmabuf->dmasize >> sample_shift[dmabuf->fmt];
	channel->eso -= 1;

	if (state->card->pci_id != PCI_DEVICE_ID_SI_7018) {
		channel->attribute = 0;
	}

	channel->fm_vol = 0x0;

	channel->control = CHANNEL_LOOP;
	if (dmabuf->fmt & TRIDENT_FMT_16BIT) {
		/* 16-bits */
		channel->control |= CHANNEL_16BITS;
		/* signed */
		channel->control |= CHANNEL_SIGNED;
	}
	if (dmabuf->fmt & TRIDENT_FMT_STEREO)
		/* stereo */
		channel->control |= CHANNEL_STEREO;

	pr_debug("trident: trident_rec_setup, LBA = 0x%08x, Delat = 0x%08x, "
		 "ESO = 0x%08x, Control = 0x%08x\n", channel->lba,
		 channel->delta, channel->eso, channel->control);

	trident_write_voice_regs(state);
}

/* get current playback/recording dma buffer pointer (byte offset from LBA),
   called with spinlock held! */
static inline unsigned
trident_get_dma_addr(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	u32 cso;

	if (!dmabuf->enable)
		return 0;

	outb(dmabuf->channel->num, TRID_REG(state->card, T4D_LFO_GC_CIR));

	switch (state->card->pci_id) {
	case PCI_DEVICE_ID_ALI_5451:
	case PCI_DEVICE_ID_SI_7018:
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
	case PCI_DEVICE_ID_INTERG_5050:
		/* 16 bits ESO, CSO for 7018 and DX */
		cso = inw(TRID_REG(state->card, CH_DX_CSO_ALPHA_FMS + 2));
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		/* 24 bits ESO, CSO for NX */
		cso = inl(TRID_REG(state->card, CH_NX_DELTA_CSO)) & 0x00ffffff;
		break;
	default:
		return 0;
	}

	pr_debug("trident: trident_get_dma_addr: chip reported channel: %d, "
		 "cso = 0x%04x\n", dmabuf->channel->num, cso);

	/* ESO and CSO are in units of Samples, convert to byte offset */
	cso <<= sample_shift[dmabuf->fmt];

	return (cso % dmabuf->dmasize);
}

/* Stop recording (lock held) */
static inline void
__stop_adc(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned int chan_num = dmabuf->channel->num;
	struct trident_card *card = state->card;

	dmabuf->enable &= ~ADC_RUNNING;
	trident_stop_voice(card, chan_num);
	trident_disable_voice_irq(card, chan_num);
}

static void
stop_adc(struct trident_state *state)
{
	struct trident_card *card = state->card;
	unsigned long flags;

	spin_lock_irqsave(&card->lock, flags);
	__stop_adc(state);
	spin_unlock_irqrestore(&card->lock, flags);
}

static void
start_adc(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned int chan_num = dmabuf->channel->num;
	struct trident_card *card = state->card;
	unsigned long flags;

	spin_lock_irqsave(&card->lock, flags);
	if ((dmabuf->mapped || 
	     dmabuf->count < (signed) dmabuf->dmasize) && 
	    dmabuf->ready) {
		dmabuf->enable |= ADC_RUNNING;
		trident_enable_voice_irq(card, chan_num);
		trident_start_voice(card, chan_num);
	}
	spin_unlock_irqrestore(&card->lock, flags);
}

/* stop playback (lock held) */
static inline void
__stop_dac(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned int chan_num = dmabuf->channel->num;
	struct trident_card *card = state->card;

	dmabuf->enable &= ~DAC_RUNNING;
	trident_stop_voice(card, chan_num);
	if (state->chans_num == 6) {
		trident_stop_voice(card, state->other_states[0]->
				   dmabuf.channel->num);
		trident_stop_voice(card, state->other_states[1]->
				   dmabuf.channel->num);
		trident_stop_voice(card, state->other_states[2]->
				   dmabuf.channel->num);
		trident_stop_voice(card, state->other_states[3]->
				   dmabuf.channel->num);
	}
	trident_disable_voice_irq(card, chan_num);
}

static void
stop_dac(struct trident_state *state)
{
	struct trident_card *card = state->card;
	unsigned long flags;

	spin_lock_irqsave(&card->lock, flags);
	__stop_dac(state);
	spin_unlock_irqrestore(&card->lock, flags);
}

static void
start_dac(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned int chan_num = dmabuf->channel->num;
	struct trident_card *card = state->card;
	unsigned long flags;

	spin_lock_irqsave(&card->lock, flags);
	if ((dmabuf->mapped || dmabuf->count > 0) && dmabuf->ready) {
		dmabuf->enable |= DAC_RUNNING;
		trident_enable_voice_irq(card, chan_num);
		trident_start_voice(card, chan_num);
		if (state->chans_num == 6) {
			trident_start_voice(card, state->other_states[0]->
					    dmabuf.channel->num);
			trident_start_voice(card, state->other_states[1]->
					    dmabuf.channel->num);
			trident_start_voice(card, state->other_states[2]->
					    dmabuf.channel->num);
			trident_start_voice(card, state->other_states[3]->
					    dmabuf.channel->num);
		}
	}
	spin_unlock_irqrestore(&card->lock, flags);
}

#define DMABUF_DEFAULTORDER (15-PAGE_SHIFT)
#define DMABUF_MINORDER 1

/* alloc a DMA buffer of with a buffer of this order */
static int
alloc_dmabuf(struct dmabuf *dmabuf, struct pci_dev *pci_dev, int order)
{
	void *rawbuf = NULL;
	struct page *page, *pend;

	if (!(rawbuf = pci_alloc_consistent(pci_dev, PAGE_SIZE << order, 
					    &dmabuf->dma_handle)))
		return -ENOMEM;

	pr_debug("trident: allocated %ld (order = %d) bytes at %p\n",
		 PAGE_SIZE << order, order, rawbuf);

	dmabuf->ready = dmabuf->mapped = 0;
	dmabuf->rawbuf = rawbuf;
	dmabuf->buforder = order;

	/* now mark the pages as reserved; otherwise */ 
	/* remap_pfn_range doesn't do what we want */
	pend = virt_to_page(rawbuf + (PAGE_SIZE << order) - 1);
	for (page = virt_to_page(rawbuf); page <= pend; page++)
		SetPageReserved(page);

	return 0;
}

/* allocate the main DMA buffer, playback and recording buffer should be */
/* allocated separately */
static int
alloc_main_dmabuf(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	int order;
	int ret = -ENOMEM;

	/* alloc as big a chunk as we can, FIXME: is this necessary ?? */
	for (order = DMABUF_DEFAULTORDER; order >= DMABUF_MINORDER; order--) {
		if (!(ret = alloc_dmabuf(dmabuf, state->card->pci_dev, order)))
			return 0;
		/* else try again */
	}
	return ret;
}

/* deallocate a DMA buffer */
static void
dealloc_dmabuf(struct dmabuf *dmabuf, struct pci_dev *pci_dev)
{
	struct page *page, *pend;

	if (dmabuf->rawbuf) {
		/* undo marking the pages as reserved */
		pend = virt_to_page(dmabuf->rawbuf + (PAGE_SIZE << dmabuf->buforder) - 1);
		for (page = virt_to_page(dmabuf->rawbuf); page <= pend; page++)
			ClearPageReserved(page);
		pci_free_consistent(pci_dev, PAGE_SIZE << dmabuf->buforder, 
				    dmabuf->rawbuf, dmabuf->dma_handle);
		dmabuf->rawbuf = NULL;
	}
	dmabuf->mapped = dmabuf->ready = 0;
}

static int
prog_dmabuf(struct trident_state *state, enum dmabuf_mode rec)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned bytepersec;
	struct trident_state *s = state;
	unsigned bufsize, dma_nums;
	unsigned long flags;
	int ret, i, order;

	if ((ret = lock_set_fmt(state)) < 0)
		return ret;

	if (state->chans_num == 6)
		dma_nums = 5;
	else
		dma_nums = 1;

	for (i = 0; i < dma_nums; i++) {
		if (i > 0) {
			s = state->other_states[i - 1];
			dmabuf = &s->dmabuf;
			dmabuf->fmt = state->dmabuf.fmt;
			dmabuf->rate = state->dmabuf.rate;
		}

		spin_lock_irqsave(&s->card->lock, flags);
		dmabuf->hwptr = dmabuf->swptr = dmabuf->total_bytes = 0;
		dmabuf->count = dmabuf->error = 0;
		spin_unlock_irqrestore(&s->card->lock, flags);

		/* allocate DMA buffer if not allocated yet */
		if (!dmabuf->rawbuf) {
			if (i == 0) {
				if ((ret = alloc_main_dmabuf(state))) {
					unlock_set_fmt(state);
					return ret;
				}
			} else {
				ret = -ENOMEM;
				order = state->dmabuf.buforder - 1;
				if (order >= DMABUF_MINORDER) {
					ret = alloc_dmabuf(dmabuf,
							   state->card->pci_dev,
							   order);
				}
				if (ret) {
					/* release the main DMA buffer */
					dealloc_dmabuf(&state->dmabuf, state->card->pci_dev);
					/* release the auxiliary DMA buffers */
					for (i -= 2; i >= 0; i--)
						dealloc_dmabuf(&state->other_states[i]->dmabuf, 
							       state->card->pci_dev);
					unlock_set_fmt(state);
					return ret;
				}
			}
		}
		/* FIXME: figure out all this OSS fragment stuff */
		bytepersec = dmabuf->rate << sample_shift[dmabuf->fmt];
		bufsize = PAGE_SIZE << dmabuf->buforder;
		if (dmabuf->ossfragshift) {
			if ((1000 << dmabuf->ossfragshift) < bytepersec)
				dmabuf->fragshift = ld2(bytepersec / 1000);
			else
				dmabuf->fragshift = dmabuf->ossfragshift;
		} else {
			/* lets hand out reasonable big ass buffers by default */
			dmabuf->fragshift = (dmabuf->buforder + PAGE_SHIFT - 2);
		}
		dmabuf->numfrag = bufsize >> dmabuf->fragshift;
		while (dmabuf->numfrag < 4 && dmabuf->fragshift > 3) {
			dmabuf->fragshift--;
			dmabuf->numfrag = bufsize >> dmabuf->fragshift;
		}
		dmabuf->fragsize = 1 << dmabuf->fragshift;
		if (dmabuf->ossmaxfrags >= 4 && dmabuf->ossmaxfrags < dmabuf->numfrag)
			dmabuf->numfrag = dmabuf->ossmaxfrags;
		dmabuf->fragsamples = dmabuf->fragsize >> sample_shift[dmabuf->fmt];
		dmabuf->dmasize = dmabuf->numfrag << dmabuf->fragshift;

		memset(dmabuf->rawbuf, (dmabuf->fmt & TRIDENT_FMT_16BIT) ? 0 : 0x80, 
		       dmabuf->dmasize);

		spin_lock_irqsave(&s->card->lock, flags);
		if (rec == DM_RECORD)
			trident_rec_setup(s);
		else /* DM_PLAYBACK */
			trident_play_setup(s);

		spin_unlock_irqrestore(&s->card->lock, flags);

		/* set the ready flag for the dma buffer */
		dmabuf->ready = 1;

		pr_debug("trident: prog_dmabuf(%d), sample rate = %d, "
			 "format = %d, numfrag = %d, fragsize = %d "
			 "dmasize = %d\n", dmabuf->channel->num,
			 dmabuf->rate, dmabuf->fmt, dmabuf->numfrag,
			 dmabuf->fragsize, dmabuf->dmasize);
	}
	unlock_set_fmt(state);
	return 0;
}


static inline int prog_dmabuf_record(struct trident_state* state)
{
	return prog_dmabuf(state, DM_RECORD);
}

static inline int prog_dmabuf_playback(struct trident_state* state)
{
	return prog_dmabuf(state, DM_PLAYBACK);
}

/* we are doing quantum mechanics here, the buffer can only be empty, half or full filled i.e.
   |------------|------------|   or   |xxxxxxxxxxxx|------------|   or   |xxxxxxxxxxxx|xxxxxxxxxxxx|
   but we almost always get this
   |xxxxxx------|------------|   or   |xxxxxxxxxxxx|xxxxx-------|
   so we have to clear the tail space to "silence"
   |xxxxxx000000|------------|   or   |xxxxxxxxxxxx|xxxxxx000000|
*/
static void
trident_clear_tail(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned swptr;
	unsigned char silence = (dmabuf->fmt & TRIDENT_FMT_16BIT) ? 0 : 0x80;
	unsigned int len;
	unsigned long flags;

	spin_lock_irqsave(&state->card->lock, flags);
	swptr = dmabuf->swptr;
	spin_unlock_irqrestore(&state->card->lock, flags);

	if (swptr == 0 || swptr == dmabuf->dmasize / 2 || 
	    swptr == dmabuf->dmasize)
		return;

	if (swptr < dmabuf->dmasize / 2)
		len = dmabuf->dmasize / 2 - swptr;
	else
		len = dmabuf->dmasize - swptr;

	memset(dmabuf->rawbuf + swptr, silence, len);
	if (state->card->pci_id != PCI_DEVICE_ID_ALI_5451) {
		spin_lock_irqsave(&state->card->lock, flags);
		dmabuf->swptr += len;
		dmabuf->count += len;
		spin_unlock_irqrestore(&state->card->lock, flags);
	}

	/* restart the dma machine in case it is halted */
	start_dac(state);
}

static int
drain_dac(struct trident_state *state, int nonblock)
{
	DECLARE_WAITQUEUE(wait, current);
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned long flags;
	unsigned long tmo;
	int count;
	unsigned long diff = 0;

	if (dmabuf->mapped || !dmabuf->ready)
		return 0;

	add_wait_queue(&dmabuf->wait, &wait);
	for (;;) {
		/* It seems that we have to set the current state to TASK_INTERRUPTIBLE
		   every time to make the process really go to sleep */
		set_current_state(TASK_INTERRUPTIBLE);

		spin_lock_irqsave(&state->card->lock, flags);
		count = dmabuf->count;
		spin_unlock_irqrestore(&state->card->lock, flags);

		if (count <= 0)
			break;

		if (signal_pending(current))
			break;

		if (nonblock) {
			remove_wait_queue(&dmabuf->wait, &wait);
			set_current_state(TASK_RUNNING);
			return -EBUSY;
		}

		/* No matter how much data is left in the buffer, we have to wait until
		   CSO == ESO/2 or CSO == ESO when address engine interrupts */
		if (state->card->pci_id == PCI_DEVICE_ID_ALI_5451 || 
		    state->card->pci_id == PCI_DEVICE_ID_INTERG_5050) {
			diff = dmabuf->swptr - trident_get_dma_addr(state) + dmabuf->dmasize;
			diff = diff % (dmabuf->dmasize);
			tmo = (diff * HZ) / dmabuf->rate;
		} else {
			tmo = (dmabuf->dmasize * HZ) / dmabuf->rate;
		}
		tmo >>= sample_shift[dmabuf->fmt];
		if (!schedule_timeout(tmo ? tmo : 1) && tmo) {
			break;
		}
	}
	remove_wait_queue(&dmabuf->wait, &wait);
	set_current_state(TASK_RUNNING);
	if (signal_pending(current))
		return -ERESTARTSYS;

	return 0;
}

/* update buffer manangement pointers, especially, */ 
/* dmabuf->count and dmabuf->hwptr */
static void
trident_update_ptr(struct trident_state *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned hwptr, swptr;
	int clear_cnt = 0;
	int diff;
	unsigned char silence;
	unsigned half_dmasize;

	/* update hardware pointer */
	hwptr = trident_get_dma_addr(state);
	diff = (dmabuf->dmasize + hwptr - dmabuf->hwptr) % dmabuf->dmasize;
	dmabuf->hwptr = hwptr;
	dmabuf->total_bytes += diff;

	/* error handling and process wake up for ADC */
	if (dmabuf->enable == ADC_RUNNING) {
		if (dmabuf->mapped) {
			dmabuf->count -= diff;
			if (dmabuf->count >= (signed) dmabuf->fragsize)
				wake_up(&dmabuf->wait);
		} else {
			dmabuf->count += diff;

			if (dmabuf->count < 0 || 
			    dmabuf->count > dmabuf->dmasize) {
				/* buffer underrun or buffer overrun, */ 
				/* we have no way to recover it here, just */ 
				/* stop the machine and let the process */ 
				/* force hwptr and swptr to sync */
				__stop_adc(state);
				dmabuf->error++;
			}
			if (dmabuf->count < (signed) dmabuf->dmasize / 2)
				wake_up(&dmabuf->wait);
		}
	}

	/* error handling and process wake up for DAC */
	if (dmabuf->enable == DAC_RUNNING) {
		if (dmabuf->mapped) {
			dmabuf->count += diff;
			if (dmabuf->count >= (signed) dmabuf->fragsize)
				wake_up(&dmabuf->wait);
		} else {
			dmabuf->count -= diff;

			if (dmabuf->count < 0 || 
			    dmabuf->count > dmabuf->dmasize) {
				/* buffer underrun or buffer overrun, we have no way to recover
				   it here, just stop the machine and let the process force hwptr
				   and swptr to sync */
				__stop_dac(state);
				dmabuf->error++;
			} else if (!dmabuf->endcleared) {
				swptr = dmabuf->swptr;
				silence = (dmabuf->fmt & TRIDENT_FMT_16BIT ? 0 : 0x80);
				if (dmabuf->update_flag & ALI_ADDRESS_INT_UPDATE) {
					/* We must clear end data of 1/2 dmabuf if needed.
					   According to 1/2 algorithm of Address Engine Interrupt,
					   check the validation of the data of half dmasize. */
					half_dmasize = dmabuf->dmasize / 2;
					if ((diff = hwptr - half_dmasize) < 0)
						diff = hwptr;
					if ((dmabuf->count + diff) < half_dmasize) {
						//there is invalid data in the end of half buffer
						if ((clear_cnt = half_dmasize - swptr) < 0)
							clear_cnt += half_dmasize;
						//clear the invalid data
						memset(dmabuf->rawbuf + swptr, silence, clear_cnt);
						if (state->chans_num == 6) {
							clear_cnt = clear_cnt / 2;
							swptr = swptr / 2;
							memset(state->other_states[0]->dmabuf.rawbuf + swptr, 
							       silence, clear_cnt);
							memset(state->other_states[1]->dmabuf.rawbuf + swptr, 
							       silence, clear_cnt);
							memset(state->other_states[2]->dmabuf.rawbuf + swptr, 
							       silence, clear_cnt);
							memset(state->other_states[3]->dmabuf.rawbuf + swptr, 
							       silence, clear_cnt);
						}
						dmabuf->endcleared = 1;
					}
				} else if (dmabuf->count < (signed) dmabuf->fragsize) {
					clear_cnt = dmabuf->fragsize;
					if ((swptr + clear_cnt) > dmabuf->dmasize)
						clear_cnt = dmabuf->dmasize - swptr;
					memset(dmabuf->rawbuf + swptr, silence, clear_cnt);
					if (state->chans_num == 6) {
						clear_cnt = clear_cnt / 2;
						swptr = swptr / 2;
						memset(state->other_states[0]->dmabuf.rawbuf + swptr, 
						       silence, clear_cnt);
						memset(state->other_states[1]->dmabuf.rawbuf + swptr, 
						       silence, clear_cnt);
						memset(state->other_states[2]->dmabuf.rawbuf + swptr, 
						       silence, clear_cnt);
						memset(state->other_states[3]->dmabuf.rawbuf + swptr, 
						       silence, clear_cnt);
					}
					dmabuf->endcleared = 1;
				}
			}
			/* trident_update_ptr is called by interrupt handler or by process via
			   ioctl/poll, we only wake up the waiting process when we have more
			   than 1/2 buffer free (always true for interrupt handler) */
			if (dmabuf->count < (signed) dmabuf->dmasize / 2)
				wake_up(&dmabuf->wait);
		}
	}
	dmabuf->update_flag &= ~ALI_ADDRESS_INT_UPDATE;
}

static void
trident_address_interrupt(struct trident_card *card)
{
	int i;
	struct trident_state *state;
	unsigned int channel;

	/* Update the pointers for all channels we are running. */
	/* FIXME: should read interrupt status only once */
	for (i = 0; i < NR_HW_CH; i++) {
		channel = 63 - i;
		if (trident_check_channel_interrupt(card, channel)) {
			trident_ack_channel_interrupt(card, channel);
			if ((state = card->states[i]) != NULL) {
				trident_update_ptr(state);
			} else {
				printk(KERN_WARNING "trident: spurious channel " 
				       "irq %d.\n", channel);
				trident_stop_voice(card, channel);
				trident_disable_voice_irq(card, channel);
			}
		}
	}
}

static void
ali_hwvol_control(struct trident_card *card, int opt)
{
	u16 dwTemp, volume[2], mute, diff, *pVol[2];

	dwTemp = ali_ac97_read(card->ac97_codec[0], 0x02);
	mute = dwTemp & 0x8000;
	volume[0] = dwTemp & 0x001f;
	volume[1] = (dwTemp & 0x1f00) >> 8;
	if (volume[0] < volume[1]) {
		pVol[0] = &volume[0];
		pVol[1] = &volume[1];
	} else {
		pVol[1] = &volume[0];
		pVol[0] = &volume[1];
	}
	diff = *(pVol[1]) - *(pVol[0]);

	if (opt == 1) {		// MUTE
		dwTemp ^= 0x8000;
		ali_ac97_write(card->ac97_codec[0], 
			       0x02, dwTemp);
	} else if (opt == 2) {	// Down
		if (mute)
			return;
		if (*(pVol[1]) < 0x001f) {
			(*pVol[1])++;
			*(pVol[0]) = *(pVol[1]) - diff;
		}
		dwTemp &= 0xe0e0;
		dwTemp |= (volume[0]) | (volume[1] << 8);
		ali_ac97_write(card->ac97_codec[0], 0x02, dwTemp);
		card->ac97_codec[0]->mixer_state[0] = ((32 - volume[0]) * 25 / 8) | 
			(((32 - volume[1]) * 25 / 8) << 8);
	} else if (opt == 4) {	// Up
		if (mute)
			return;
		if (*(pVol[0]) > 0) {
			(*pVol[0])--;
			*(pVol[1]) = *(pVol[0]) + diff;
		}
		dwTemp &= 0xe0e0;
		dwTemp |= (volume[0]) | (volume[1] << 8);
		ali_ac97_write(card->ac97_codec[0], 0x02, dwTemp);
		card->ac97_codec[0]->mixer_state[0] = ((32 - volume[0]) * 25 / 8) | 
			(((32 - volume[1]) * 25 / 8) << 8);
	} else {
		/* Nothing needs doing */
	}
}

/*
 *	Re-enable reporting of vol change after 0.1 seconds
 */

static void
ali_timeout(unsigned long ptr)
{
	struct trident_card *card = (struct trident_card *) ptr;
	u16 temp = 0;

	/* Enable GPIO IRQ (MISCINT bit 18h) */
	temp = inw(TRID_REG(card, T4D_MISCINT + 2));
	temp |= 0x0004;
	outw(temp, TRID_REG(card, T4D_MISCINT + 2));
}

/*
 *	Set up the timer to clear the vol change notification
 */

static void
ali_set_timer(struct trident_card *card)
{
	/* Add Timer Routine to Enable GPIO IRQ */
	del_timer(&card->timer);	/* Never queue twice */
	card->timer.function = ali_timeout;
	card->timer.data = (unsigned long) card;
	card->timer.expires = jiffies + HZ / 10;
	add_timer(&card->timer);
}

/*
 *	Process a GPIO event
 */

static void
ali_queue_task(struct trident_card *card, int opt)
{
	u16 temp;

	/* Disable GPIO IRQ (MISCINT bit 18h) */
	temp = inw(TRID_REG(card, T4D_MISCINT + 2));
	temp &= (u16) (~0x0004);
	outw(temp, TRID_REG(card, T4D_MISCINT + 2));

	/* Adjust the volume */
	ali_hwvol_control(card, opt);

	/* Set the timer for 1/10th sec */
	ali_set_timer(card);
}

static void
cyber_address_interrupt(struct trident_card *card)
{
	int i, irq_status;
	struct trident_state *state;
	unsigned int channel;

	/* Update the pointers for all channels we are running. */
	/* FIXED: read interrupt status only once */
	irq_status = inl(TRID_REG(card, T4D_AINT_A));

	pr_debug("cyber_address_interrupt: irq_status 0x%X\n", irq_status);

	for (i = 0; i < NR_HW_CH; i++) {
		channel = 31 - i;
		if (irq_status & (1 << channel)) {
			/* clear bit by writing a 1, zeroes are ignored */
			outl((1 << channel), TRID_REG(card, T4D_AINT_A));

			pr_debug("cyber_interrupt: channel %d\n", channel);

			if ((state = card->states[i]) != NULL) {
				trident_update_ptr(state);
			} else {
				printk(KERN_WARNING "cyber5050: spurious " 
				       "channel irq %d.\n", channel);
				trident_stop_voice(card, channel);
				trident_disable_voice_irq(card, channel);
			}
		}
	}
}

static irqreturn_t
trident_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct trident_card *card = (struct trident_card *) dev_id;
	u32 event;
	u32 gpio;

	spin_lock(&card->lock);
	event = inl(TRID_REG(card, T4D_MISCINT));

	pr_debug("trident: trident_interrupt called, MISCINT = 0x%08x\n",
		 event);

	if (event & ADDRESS_IRQ) {
		card->address_interrupt(card);
	}

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		/* GPIO IRQ (H/W Volume Control) */
		event = inl(TRID_REG(card, T4D_MISCINT));
		if (event & (1 << 25)) {
			gpio = inl(TRID_REG(card, ALI_GPIO));
			if (!timer_pending(&card->timer))
				ali_queue_task(card, gpio & 0x07);
		}
		event = inl(TRID_REG(card, T4D_MISCINT));
		outl(event | (ST_TARGET_REACHED | MIXER_OVERFLOW | MIXER_UNDERFLOW), 
		     TRID_REG(card, T4D_MISCINT));
		spin_unlock(&card->lock);
		return IRQ_HANDLED;
	}

	/* manually clear interrupt status, bad hardware design, blame T^2 */
	outl((ST_TARGET_REACHED | MIXER_OVERFLOW | MIXER_UNDERFLOW), 
	     TRID_REG(card, T4D_MISCINT));
	spin_unlock(&card->lock);
	return IRQ_HANDLED;
}

/* in this loop, dmabuf.count signifies the amount of data that is waiting */ 
/* to be copied to the user's buffer.  it is filled by the dma machine and */ 
/* drained by this loop. */
static ssize_t
trident_read(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct dmabuf *dmabuf = &state->dmabuf;
	ssize_t ret = 0;
	unsigned long flags;
	unsigned swptr;
	int cnt;

	pr_debug("trident: trident_read called, count = %zd\n", count);

	VALIDATE_STATE(state);

	if (dmabuf->mapped)
		return -ENXIO;
	if (!access_ok(VERIFY_WRITE, buffer, count))
		return -EFAULT;

	mutex_lock(&state->sem);
	if (!dmabuf->ready && (ret = prog_dmabuf_record(state)))
		goto out;

	while (count > 0) {
		spin_lock_irqsave(&state->card->lock, flags);
		if (dmabuf->count > (signed) dmabuf->dmasize) {
			/* buffer overrun, we are recovering from */ 
			/* sleep_on_timeout, resync hwptr and swptr, */ 
			/* make process flush the buffer */
			dmabuf->count = dmabuf->dmasize;
			dmabuf->swptr = dmabuf->hwptr;
		}
		swptr = dmabuf->swptr;
		cnt = dmabuf->dmasize - swptr;
		if (dmabuf->count < cnt)
			cnt = dmabuf->count;
		spin_unlock_irqrestore(&state->card->lock, flags);

		if (cnt > count)
			cnt = count;
		if (cnt <= 0) {
			unsigned long tmo;
			/* buffer is empty, start the dma machine and */ 
			/* wait for data to be recorded */
			start_adc(state);
			if (file->f_flags & O_NONBLOCK) {
				if (!ret)
					ret = -EAGAIN;
				goto out;
			}

			mutex_unlock(&state->sem);
			/* No matter how much space left in the buffer, */ 
			/* we have to wait until CSO == ESO/2 or CSO == ESO */ 
			/* when address engine interrupts */
			tmo = (dmabuf->dmasize * HZ) / (dmabuf->rate * 2);
			tmo >>= sample_shift[dmabuf->fmt];
			/* There are two situations when sleep_on_timeout returns, one is when
			   the interrupt is serviced correctly and the process is waked up by
			   ISR ON TIME. Another is when timeout is expired, which means that
			   either interrupt is NOT serviced correctly (pending interrupt) or it
			   is TOO LATE for the process to be scheduled to run (scheduler latency)
			   which results in a (potential) buffer overrun. And worse, there is
			   NOTHING we can do to prevent it. */
			if (!interruptible_sleep_on_timeout(&dmabuf->wait, tmo)) {
				pr_debug(KERN_ERR "trident: recording schedule timeout, "
					 "dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
					 dmabuf->dmasize, dmabuf->fragsize, dmabuf->count,
					 dmabuf->hwptr, dmabuf->swptr);

				/* a buffer overrun, we delay the recovery until next time the
				   while loop begin and we REALLY have space to record */
			}
			if (signal_pending(current)) {
				if (!ret)
					ret = -ERESTARTSYS;
				goto out;
			}
			mutex_lock(&state->sem);
			if (dmabuf->mapped) {
				if (!ret)
					ret = -ENXIO;
				goto out;
			}
			continue;
		}

		if (copy_to_user(buffer, dmabuf->rawbuf + swptr, cnt)) {
			if (!ret)
				ret = -EFAULT;
			goto out;
		}

		swptr = (swptr + cnt) % dmabuf->dmasize;

		spin_lock_irqsave(&state->card->lock, flags);
		dmabuf->swptr = swptr;
		dmabuf->count -= cnt;
		spin_unlock_irqrestore(&state->card->lock, flags);

		count -= cnt;
		buffer += cnt;
		ret += cnt;
		start_adc(state);
	}
out:
	mutex_unlock(&state->sem);
	return ret;
}

/* in this loop, dmabuf.count signifies the amount of data that is waiting to be dma to
   the soundcard.  it is drained by the dma machine and filled by this loop. */

static ssize_t
trident_write(struct file *file, const char __user *buffer, size_t count, loff_t * ppos)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct dmabuf *dmabuf = &state->dmabuf;
	ssize_t ret;
	unsigned long flags;
	unsigned swptr;
	int cnt;
	unsigned int state_cnt;
	unsigned int copy_count;
	int lret; /* for lock_set_fmt */

	pr_debug("trident: trident_write called, count = %zd\n", count);

	VALIDATE_STATE(state);

	/*
	 *      Guard against an mmap or ioctl while writing
	 */

	mutex_lock(&state->sem);

	if (dmabuf->mapped) {
		ret = -ENXIO;
		goto out;
	}
	if (!dmabuf->ready && (ret = prog_dmabuf_playback(state)))
		goto out;

	if (!access_ok(VERIFY_READ, buffer, count)) {
		ret = -EFAULT;
		goto out;
	}

	ret = 0;

	while (count > 0) {
		spin_lock_irqsave(&state->card->lock, flags);
		if (dmabuf->count < 0) {
			/* buffer underrun, we are recovering from */ 
			/* sleep_on_timeout, resync hwptr and swptr */
			dmabuf->count = 0;
			dmabuf->swptr = dmabuf->hwptr;
		}
		swptr = dmabuf->swptr;
		cnt = dmabuf->dmasize - swptr;
		if (dmabuf->count + cnt > dmabuf->dmasize)
			cnt = dmabuf->dmasize - dmabuf->count;
		spin_unlock_irqrestore(&state->card->lock, flags);

		if (cnt > count)
			cnt = count;
		if (cnt <= 0) {
			unsigned long tmo;
			/* buffer is full, start the dma machine and */ 
			/* wait for data to be played */
			start_dac(state);
			if (file->f_flags & O_NONBLOCK) {
				if (!ret)
					ret = -EAGAIN;
				goto out;
			}
			/* No matter how much data left in the buffer, */ 
			/* we have to wait until CSO == ESO/2 or CSO == ESO */ 
			/* when address engine interrupts */
			lock_set_fmt(state);
			tmo = (dmabuf->dmasize * HZ) / (dmabuf->rate * 2);
			tmo >>= sample_shift[dmabuf->fmt];
			unlock_set_fmt(state);
			mutex_unlock(&state->sem);

			/* There are two situations when sleep_on_timeout */ 
			/* returns, one is when the interrupt is serviced */ 
			/* correctly and the process is waked up by ISR */ 
			/* ON TIME. Another is when timeout is expired, which */ 
			/* means that either interrupt is NOT serviced */ 
			/* correctly (pending interrupt) or it is TOO LATE */ 
			/* for the process to be scheduled to run */ 
			/* (scheduler latency) which results in a (potential) */ 
			/* buffer underrun. And worse, there is NOTHING we */ 
			/* can do to prevent it. */
			if (!interruptible_sleep_on_timeout(&dmabuf->wait, tmo)) {
				pr_debug(KERN_ERR "trident: playback schedule "
					 "timeout, dmasz %u fragsz %u count %i "
					 "hwptr %u swptr %u\n", dmabuf->dmasize,
					 dmabuf->fragsize, dmabuf->count,
					 dmabuf->hwptr, dmabuf->swptr);

				/* a buffer underrun, we delay the recovery */ 
				/* until next time the while loop begin and */ 
				/* we REALLY have data to play */
			}
			if (signal_pending(current)) {
				if (!ret)
					ret = -ERESTARTSYS;
				goto out_nolock;
			}
			mutex_lock(&state->sem);
			if (dmabuf->mapped) {
				if (!ret)
					ret = -ENXIO;
				goto out;
			}
			continue;
		}
		if ((lret = lock_set_fmt(state)) < 0) {
			ret = lret;
			goto out;
		}

		if (state->chans_num == 6) {
			copy_count = 0;
			state_cnt = 0;
			if (ali_write_5_1(state, buffer, cnt, &copy_count, 
					  &state_cnt) == -EFAULT) {
				if (state_cnt) {
					swptr = (swptr + state_cnt) % dmabuf->dmasize;
					spin_lock_irqsave(&state->card->lock, flags);
					dmabuf->swptr = swptr;
					dmabuf->count += state_cnt;
					dmabuf->endcleared = 0;
					spin_unlock_irqrestore(&state->card->lock, flags);
				}
				ret += copy_count;
				if (!ret)
					ret = -EFAULT;
				unlock_set_fmt(state);
				goto out;
			}
		} else {
			if (copy_from_user(dmabuf->rawbuf + swptr, 
					   buffer, cnt)) {
				if (!ret)
					ret = -EFAULT;
				unlock_set_fmt(state);
				goto out;
			}
			state_cnt = cnt;
		}
		unlock_set_fmt(state);

		swptr = (swptr + state_cnt) % dmabuf->dmasize;

		spin_lock_irqsave(&state->card->lock, flags);
		dmabuf->swptr = swptr;
		dmabuf->count += state_cnt;
		dmabuf->endcleared = 0;
		spin_unlock_irqrestore(&state->card->lock, flags);

		count -= cnt;
		buffer += cnt;
		ret += cnt;
		start_dac(state);
	}
out:
	mutex_unlock(&state->sem);
out_nolock:
	return ret;
}

/* No kernel lock - we have our own spinlock */
static unsigned int
trident_poll(struct file *file, struct poll_table_struct *wait)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned long flags;
	unsigned int mask = 0;

	VALIDATE_STATE(state);

	/*
	 *      Guard against a parallel poll and write causing multiple
	 *      prog_dmabuf events
	 */

	mutex_lock(&state->sem);

	if (file->f_mode & FMODE_WRITE) {
		if (!dmabuf->ready && prog_dmabuf_playback(state)) {
			mutex_unlock(&state->sem);
			return 0;
		}
		poll_wait(file, &dmabuf->wait, wait);
	}
	if (file->f_mode & FMODE_READ) {
		if (!dmabuf->ready && prog_dmabuf_record(state)) {
			mutex_unlock(&state->sem);
			return 0;
		}
		poll_wait(file, &dmabuf->wait, wait);
	}

	mutex_unlock(&state->sem);

	spin_lock_irqsave(&state->card->lock, flags);
	trident_update_ptr(state);
	if (file->f_mode & FMODE_READ) {
		if (dmabuf->count >= (signed) dmabuf->fragsize)
			mask |= POLLIN | POLLRDNORM;
	}
	if (file->f_mode & FMODE_WRITE) {
		if (dmabuf->mapped) {
			if (dmabuf->count >= (signed) dmabuf->fragsize)
				mask |= POLLOUT | POLLWRNORM;
		} else {
			if ((signed) dmabuf->dmasize >= dmabuf->count + 
			    (signed) dmabuf->fragsize)
				mask |= POLLOUT | POLLWRNORM;
		}
	}
	spin_unlock_irqrestore(&state->card->lock, flags);

	return mask;
}

static int
trident_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct dmabuf *dmabuf = &state->dmabuf;
	int ret = -EINVAL;
	unsigned long size;

	VALIDATE_STATE(state);

	/*
	 *      Lock against poll read write or mmap creating buffers. Also lock
	 *      a read or write against an mmap.
	 */

	mutex_lock(&state->sem);

	if (vma->vm_flags & VM_WRITE) {
		if ((ret = prog_dmabuf_playback(state)) != 0)
			goto out;
	} else if (vma->vm_flags & VM_READ) {
		if ((ret = prog_dmabuf_record(state)) != 0)
			goto out;
	} else
		goto out;

	ret = -EINVAL;
	if (vma->vm_pgoff != 0)
		goto out;
	size = vma->vm_end - vma->vm_start;
	if (size > (PAGE_SIZE << dmabuf->buforder))
		goto out;
	ret = -EAGAIN;
	if (remap_pfn_range(vma, vma->vm_start,
			     virt_to_phys(dmabuf->rawbuf) >> PAGE_SHIFT,
			     size, vma->vm_page_prot))
		goto out;
	dmabuf->mapped = 1;
	ret = 0;
out:
	mutex_unlock(&state->sem);
	return ret;
}

static int
trident_ioctl(struct inode *inode, struct file *file, 
	      unsigned int cmd, unsigned long arg)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct dmabuf *dmabuf = &state->dmabuf;
	unsigned long flags;
	audio_buf_info abinfo;
	count_info cinfo;
	int val, mapped, ret = 0;
	struct trident_card *card = state->card;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;

	VALIDATE_STATE(state);


	mapped = ((file->f_mode & (FMODE_WRITE | FMODE_READ)) && dmabuf->mapped);

	pr_debug("trident: trident_ioctl, command = %2d, arg = 0x%08x\n",
		 _IOC_NR(cmd), arg ? *p : 0);

	switch (cmd) {
	case OSS_GETVERSION:
		ret = put_user(SOUND_VERSION, p);
		break;

	case SNDCTL_DSP_RESET:
		/* FIXME: spin_lock ? */
		if (file->f_mode & FMODE_WRITE) {
			stop_dac(state);
			synchronize_irq(card->irq);
			dmabuf->ready = 0;
			dmabuf->swptr = dmabuf->hwptr = 0;
			dmabuf->count = dmabuf->total_bytes = 0;
		}
		if (file->f_mode & FMODE_READ) {
			stop_adc(state);
			synchronize_irq(card->irq);
			dmabuf->ready = 0;
			dmabuf->swptr = dmabuf->hwptr = 0;
			dmabuf->count = dmabuf->total_bytes = 0;
		}
		break;

	case SNDCTL_DSP_SYNC:
		if (file->f_mode & FMODE_WRITE)
			ret = drain_dac(state, file->f_flags & O_NONBLOCK);
		break;

	case SNDCTL_DSP_SPEED:	/* set smaple rate */
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if (val >= 0) {
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(state);
				dmabuf->ready = 0;
				spin_lock_irqsave(&state->card->lock, flags);
				trident_set_dac_rate(state, val);
				spin_unlock_irqrestore(&state->card->lock, flags);
			}
			if (file->f_mode & FMODE_READ) {
				stop_adc(state);
				dmabuf->ready = 0;
				spin_lock_irqsave(&state->card->lock, flags);
				trident_set_adc_rate(state, val);
				spin_unlock_irqrestore(&state->card->lock, flags);
			}
		}
		ret = put_user(dmabuf->rate, p);
		break;

	case SNDCTL_DSP_STEREO:	/* set stereo or mono channel */
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if ((ret = lock_set_fmt(state)) < 0)
			return ret;

		if (file->f_mode & FMODE_WRITE) {
			stop_dac(state);
			dmabuf->ready = 0;
			if (val)
				dmabuf->fmt |= TRIDENT_FMT_STEREO;
			else
				dmabuf->fmt &= ~TRIDENT_FMT_STEREO;
		}
		if (file->f_mode & FMODE_READ) {
			stop_adc(state);
			dmabuf->ready = 0;
			if (val)
				dmabuf->fmt |= TRIDENT_FMT_STEREO;
			else
				dmabuf->fmt &= ~TRIDENT_FMT_STEREO;
		}
		unlock_set_fmt(state);
		break;

	case SNDCTL_DSP_GETBLKSIZE:
		if (file->f_mode & FMODE_WRITE) {
			if ((val = prog_dmabuf_playback(state)))
				ret = val;
			else
				ret = put_user(dmabuf->fragsize, p);
			break;
		}
		if (file->f_mode & FMODE_READ) {
			if ((val = prog_dmabuf_record(state)))
				ret = val;
			else
				ret = put_user(dmabuf->fragsize, p);
			break;
		}
		/* neither READ nor WRITE? is this even possible? */
		ret = -EINVAL;
		break;


	case SNDCTL_DSP_GETFMTS: /* Returns a mask of supported sample format */
		ret = put_user(AFMT_S16_LE | AFMT_U16_LE | AFMT_S8 | 
			       AFMT_U8, p);
		break;

	case SNDCTL_DSP_SETFMT:	/* Select sample format */
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if ((ret = lock_set_fmt(state)) < 0)
			return ret;

		if (val != AFMT_QUERY) {
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(state);
				dmabuf->ready = 0;
				if (val == AFMT_S16_LE)
					dmabuf->fmt |= TRIDENT_FMT_16BIT;
				else
					dmabuf->fmt &= ~TRIDENT_FMT_16BIT;
			}
			if (file->f_mode & FMODE_READ) {
				stop_adc(state);
				dmabuf->ready = 0;
				if (val == AFMT_S16_LE)
					dmabuf->fmt |= TRIDENT_FMT_16BIT;
				else
					dmabuf->fmt &= ~TRIDENT_FMT_16BIT;
			}
		}
		unlock_set_fmt(state);
		ret = put_user((dmabuf->fmt & TRIDENT_FMT_16BIT) ? AFMT_S16_LE : 
			       AFMT_U8, p);
		break;

	case SNDCTL_DSP_CHANNELS:
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if (val != 0) {
			if ((ret = lock_set_fmt(state)) < 0)
				return ret;

			if (file->f_mode & FMODE_WRITE) {
				stop_dac(state);
				dmabuf->ready = 0;

				//prevent from memory leak
				if ((state->chans_num > 2) && (state->chans_num != val)) {
					ali_free_other_states_resources(state);
					state->chans_num = 1;
				}

				if (val >= 2) {

					dmabuf->fmt |= TRIDENT_FMT_STEREO;
					if ((val == 6) && (state->card->pci_id == PCI_DEVICE_ID_ALI_5451)) {
						if (card->rec_channel_use_count > 0) {
							printk(KERN_ERR "trident: Record is "
							       "working on the card!\n");
							ret = -EBUSY;
							unlock_set_fmt(state);
							break;
						}

						ret = ali_setup_multi_channels(state->card, 6);
						if (ret < 0) {
							unlock_set_fmt(state);
							break;
						}
						mutex_lock(&state->card->open_mutex);
						ret = ali_allocate_other_states_resources(state, 6);
						if (ret < 0) {
							mutex_unlock(&state->card->open_mutex);
							unlock_set_fmt(state);
							break;
						}
						state->card->multi_channel_use_count++;
						mutex_unlock(&state->card->open_mutex);
					} else
						val = 2;	/*yield to 2-channels */
				} else
					dmabuf->fmt &= ~TRIDENT_FMT_STEREO;
				state->chans_num = val;
			}
			if (file->f_mode & FMODE_READ) {
				stop_adc(state);
				dmabuf->ready = 0;
				if (val >= 2) {
					if (!((file->f_mode & FMODE_WRITE) && 
					      (val == 6)))
						val = 2;
					dmabuf->fmt |= TRIDENT_FMT_STEREO;
				} else
					dmabuf->fmt &= ~TRIDENT_FMT_STEREO;
				state->chans_num = val;
			}
			unlock_set_fmt(state);
		}
		ret = put_user(val, p);
		break;

	case SNDCTL_DSP_POST:
		/* Cause the working fragment to be output */
		break;

	case SNDCTL_DSP_SUBDIVIDE:
		if (dmabuf->subdivision) {
			ret = -EINVAL;
			break;
		}
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if (val != 1 && val != 2 && val != 4) {
			ret = -EINVAL;
			break;
		}
		dmabuf->subdivision = val;
		break;

	case SNDCTL_DSP_SETFRAGMENT:
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}

		dmabuf->ossfragshift = val & 0xffff;
		dmabuf->ossmaxfrags = (val >> 16) & 0xffff;
		if (dmabuf->ossfragshift < 4)
			dmabuf->ossfragshift = 4;
		if (dmabuf->ossfragshift > 15)
			dmabuf->ossfragshift = 15;
		if (dmabuf->ossmaxfrags < 4)
			dmabuf->ossmaxfrags = 4;

		break;

	case SNDCTL_DSP_GETOSPACE:
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			break;
		}
		if (!dmabuf->ready && (val = prog_dmabuf_playback(state)) != 0) {
			ret = val;
			break;
		}
		spin_lock_irqsave(&state->card->lock, flags);
		trident_update_ptr(state);
		abinfo.fragsize = dmabuf->fragsize;
		abinfo.bytes = dmabuf->dmasize - dmabuf->count;
		abinfo.fragstotal = dmabuf->numfrag;
		abinfo.fragments = abinfo.bytes >> dmabuf->fragshift;
		spin_unlock_irqrestore(&state->card->lock, flags);
		ret = copy_to_user(argp, &abinfo, sizeof (abinfo)) ? 
			-EFAULT : 0;
		break;

	case SNDCTL_DSP_GETISPACE:
		if (!(file->f_mode & FMODE_READ)) {
			ret = -EINVAL;
			break;
		}
		if (!dmabuf->ready && (val = prog_dmabuf_record(state)) != 0) {
			ret = val;
			break;
		}
		spin_lock_irqsave(&state->card->lock, flags);
		trident_update_ptr(state);
		abinfo.fragsize = dmabuf->fragsize;
		abinfo.bytes = dmabuf->count;
		abinfo.fragstotal = dmabuf->numfrag;
		abinfo.fragments = abinfo.bytes >> dmabuf->fragshift;
		spin_unlock_irqrestore(&state->card->lock, flags);
		ret = copy_to_user(argp, &abinfo, sizeof (abinfo)) ? 
			-EFAULT : 0;
		break;

	case SNDCTL_DSP_NONBLOCK:
		file->f_flags |= O_NONBLOCK;
		break;

	case SNDCTL_DSP_GETCAPS:
		ret = put_user(DSP_CAP_REALTIME | DSP_CAP_TRIGGER | 
			       DSP_CAP_MMAP | DSP_CAP_BIND, p);
		break;

	case SNDCTL_DSP_GETTRIGGER:
		val = 0;
		if ((file->f_mode & FMODE_READ) && dmabuf->enable)
			val |= PCM_ENABLE_INPUT;
		if ((file->f_mode & FMODE_WRITE) && dmabuf->enable)
			val |= PCM_ENABLE_OUTPUT;
		ret = put_user(val, p);
		break;

	case SNDCTL_DSP_SETTRIGGER:
		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if (file->f_mode & FMODE_READ) {
			if (val & PCM_ENABLE_INPUT) {
				if (!dmabuf->ready && 
				    (ret = prog_dmabuf_record(state)))
					break;
				start_adc(state);
			} else
				stop_adc(state);
		}
		if (file->f_mode & FMODE_WRITE) {
			if (val & PCM_ENABLE_OUTPUT) {
				if (!dmabuf->ready && 
				    (ret = prog_dmabuf_playback(state)))
					break;
				start_dac(state);
			} else
				stop_dac(state);
		}
		break;

	case SNDCTL_DSP_GETIPTR:
		if (!(file->f_mode & FMODE_READ)) {
			ret = -EINVAL;
			break;
		}
		if (!dmabuf->ready && (val = prog_dmabuf_record(state))
		    != 0) {
			ret = val;
			break;
		}
		spin_lock_irqsave(&state->card->lock, flags);
		trident_update_ptr(state);
		cinfo.bytes = dmabuf->total_bytes;
		cinfo.blocks = dmabuf->count >> dmabuf->fragshift;
		cinfo.ptr = dmabuf->hwptr;
		if (dmabuf->mapped)
			dmabuf->count &= dmabuf->fragsize - 1;
		spin_unlock_irqrestore(&state->card->lock, flags);
		ret = copy_to_user(argp, &cinfo, sizeof (cinfo)) ? 
			-EFAULT : 0;
		break;

	case SNDCTL_DSP_GETOPTR:
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			break;
		}
		if (!dmabuf->ready && (val = prog_dmabuf_playback(state))
		    != 0) {
			ret = val;
			break;
		}

		spin_lock_irqsave(&state->card->lock, flags);
		trident_update_ptr(state);
		cinfo.bytes = dmabuf->total_bytes;
		cinfo.blocks = dmabuf->count >> dmabuf->fragshift;
		cinfo.ptr = dmabuf->hwptr;
		if (dmabuf->mapped)
			dmabuf->count &= dmabuf->fragsize - 1;
		spin_unlock_irqrestore(&state->card->lock, flags);
		ret = copy_to_user(argp, &cinfo, sizeof (cinfo)) ? 
			-EFAULT : 0;
		break;

	case SNDCTL_DSP_SETDUPLEX:
		ret = -EINVAL;
		break;

	case SNDCTL_DSP_GETODELAY:
		if (!(file->f_mode & FMODE_WRITE)) {
			ret = -EINVAL;
			break;
		}
		if (!dmabuf->ready && (val = prog_dmabuf_playback(state)) != 0) {
			ret = val;
			break;
		}
		spin_lock_irqsave(&state->card->lock, flags);
		trident_update_ptr(state);
		val = dmabuf->count;
		spin_unlock_irqrestore(&state->card->lock, flags);
		ret = put_user(val, p);
		break;

	case SOUND_PCM_READ_RATE:
		ret = put_user(dmabuf->rate, p);
		break;

	case SOUND_PCM_READ_CHANNELS:
		ret = put_user((dmabuf->fmt & TRIDENT_FMT_STEREO) ? 2 : 1, 
			       p);
		break;

	case SOUND_PCM_READ_BITS:
		ret = put_user((dmabuf->fmt & TRIDENT_FMT_16BIT) ? AFMT_S16_LE : 
			       AFMT_U8, p);
		break;

	case SNDCTL_DSP_GETCHANNELMASK:
		ret = put_user(DSP_BIND_FRONT | DSP_BIND_SURR | 
			       DSP_BIND_CENTER_LFE,  p);
		break;

	case SNDCTL_DSP_BIND_CHANNEL:
		if (state->card->pci_id != PCI_DEVICE_ID_SI_7018) {
			ret = -EINVAL;
			break;
		}

		if (get_user(val, p)) {
			ret = -EFAULT;
			break;
		}
		if (val == DSP_BIND_QUERY) {
			val = dmabuf->channel->attribute | 0x3c00;
			val = attr2mask[val >> 8];
		} else {
			dmabuf->ready = 0;
			if (file->f_mode & FMODE_READ)
				dmabuf->channel->attribute = (CHANNEL_REC | 
							      SRC_ENABLE);
			if (file->f_mode & FMODE_WRITE)
				dmabuf->channel->attribute = (CHANNEL_SPC_PB | 
							      SRC_ENABLE);
			dmabuf->channel->attribute |= mask2attr[ffs(val)];
		}
		ret = put_user(val, p);
		break;

	case SNDCTL_DSP_MAPINBUF:
	case SNDCTL_DSP_MAPOUTBUF:
	case SNDCTL_DSP_SETSYNCRO:
	case SOUND_PCM_WRITE_FILTER:
	case SOUND_PCM_READ_FILTER:
	default:
		ret = -EINVAL;
		break;

	}
	return ret;
}

static int
trident_open(struct inode *inode, struct file *file)
{
	int i = 0;
	int minor = iminor(inode);
	struct trident_card *card = devs;
	struct trident_state *state = NULL;
	struct dmabuf *dmabuf = NULL;

	/* Added by Matt Wu 01-05-2001 */
	/* TODO: there's some redundacy here wrt the check below */
	/* for multi_use_count > 0. Should we return -EBUSY or find */
	/* a different card? for now, don't break current behaviour */
	/* -- mulix */
	if (file->f_mode & FMODE_READ) {
		if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
			if (card->multi_channel_use_count > 0)
				return -EBUSY;
		}
	}

	/* find an available virtual channel (instance of /dev/dsp) */
	while (card != NULL) {
		mutex_lock(&card->open_mutex);
		if (file->f_mode & FMODE_READ) {
			/* Skip opens on cards that are in 6 channel mode */
			if (card->multi_channel_use_count > 0) {
				mutex_unlock(&card->open_mutex);
				card = card->next;
				continue;
			}
		}
		for (i = 0; i < NR_HW_CH; i++) {
			if (card->states[i] == NULL) {
				state = card->states[i] = kmalloc(sizeof(*state), GFP_KERNEL);
				if (state == NULL) {
					mutex_unlock(&card->open_mutex);
					return -ENOMEM;
				}
				memset(state, 0, sizeof(*state));
				mutex_init(&state->sem);
				dmabuf = &state->dmabuf;
				goto found_virt;
			}
		}
		mutex_unlock(&card->open_mutex);
		card = card->next;
	}
	/* no more virtual channel avaiable */
	if (!state) {
		return -ENODEV;
	}
      found_virt:
	/* found a free virtual channel, allocate hardware channels */
	if (file->f_mode & FMODE_READ)
		dmabuf->channel = card->alloc_rec_pcm_channel(card);
	else
		dmabuf->channel = card->alloc_pcm_channel(card);

	if (dmabuf->channel == NULL) {
		kfree(card->states[i]);
		card->states[i] = NULL;
		return -ENODEV;
	}

	/* initialize the virtual channel */
	state->virt = i;
	state->card = card;
	state->magic = TRIDENT_STATE_MAGIC;
	init_waitqueue_head(&dmabuf->wait);
	file->private_data = state;

	/* set default sample format. According to OSS Programmer's */ 
	/* Guide  /dev/dsp should be default to unsigned 8-bits, mono, */ 
	/* with sample rate 8kHz and /dev/dspW will accept 16-bits sample */
	if (file->f_mode & FMODE_WRITE) {
		dmabuf->fmt &= ~TRIDENT_FMT_MASK;
		if ((minor & 0x0f) == SND_DEV_DSP16)
			dmabuf->fmt |= TRIDENT_FMT_16BIT;
		dmabuf->ossfragshift = 0;
		dmabuf->ossmaxfrags = 0;
		dmabuf->subdivision = 0;
		if (card->pci_id == PCI_DEVICE_ID_SI_7018) {
			/* set default channel attribute to normal playback */
			dmabuf->channel->attribute = CHANNEL_PB;
		}
		trident_set_dac_rate(state, 8000);
	}

	if (file->f_mode & FMODE_READ) {
		/* FIXME: Trident 4d can only record in signed 16-bits stereo, */ 
		/* 48kHz sample, to be dealed with in trident_set_adc_rate() ?? */
		dmabuf->fmt &= ~TRIDENT_FMT_MASK;
		if ((minor & 0x0f) == SND_DEV_DSP16)
			dmabuf->fmt |= TRIDENT_FMT_16BIT;
		dmabuf->ossfragshift = 0;
		dmabuf->ossmaxfrags = 0;
		dmabuf->subdivision = 0;
		if (card->pci_id == PCI_DEVICE_ID_SI_7018) {
			/* set default channel attribute to 0x8a80, record from
			   PCM L/R FIFO and mono = (left + right + 1)/2 */
			dmabuf->channel->attribute = (CHANNEL_REC | PCM_LR | 
						      MONO_MIX);
		}
		trident_set_adc_rate(state, 8000);

		/* Added by Matt Wu 01-05-2001 */
		if (card->pci_id == PCI_DEVICE_ID_ALI_5451)
			card->rec_channel_use_count++;
	}

	state->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
	mutex_unlock(&card->open_mutex);

	pr_debug("trident: open virtual channel %d, hard channel %d\n",
		 state->virt, dmabuf->channel->num);

	return nonseekable_open(inode, file);
}

static int
trident_release(struct inode *inode, struct file *file)
{
	struct trident_state *state = (struct trident_state *)file->private_data;
	struct trident_card *card;
	struct dmabuf *dmabuf;

	VALIDATE_STATE(state);

	card = state->card;
	dmabuf = &state->dmabuf;

	if (file->f_mode & FMODE_WRITE) {
		trident_clear_tail(state);
		drain_dac(state, file->f_flags & O_NONBLOCK);
	}

	pr_debug("trident: closing virtual channel %d, hard channel %d\n",
		 state->virt, dmabuf->channel->num);

	/* stop DMA state machine and free DMA buffers/channels */
	mutex_lock(&card->open_mutex);

	if (file->f_mode & FMODE_WRITE) {
		stop_dac(state);
		dealloc_dmabuf(&state->dmabuf, state->card->pci_dev);
		state->card->free_pcm_channel(state->card, dmabuf->channel->num);

		/* Added by Matt Wu */
		if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
			if (state->chans_num > 2) {
				if (card->multi_channel_use_count-- < 0)
					card->multi_channel_use_count = 0;
				if (card->multi_channel_use_count == 0)
					ali_close_multi_channels();
				ali_free_other_states_resources(state);
			}
		}
	}
	if (file->f_mode & FMODE_READ) {
		stop_adc(state);
		dealloc_dmabuf(&state->dmabuf, state->card->pci_dev);
		state->card->free_pcm_channel(state->card, dmabuf->channel->num);

		/* Added by Matt Wu */
		if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
			if (card->rec_channel_use_count-- < 0)
				card->rec_channel_use_count = 0;
		}
	}

	card->states[state->virt] = NULL;
	kfree(state);

	/* we're covered by the open_mutex */
	mutex_unlock(&card->open_mutex);

	return 0;
}

static /*const */ struct file_operations trident_audio_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.read = trident_read,
	.write = trident_write,
	.poll = trident_poll,
	.ioctl = trident_ioctl,
	.mmap = trident_mmap,
	.open = trident_open,
	.release = trident_release,
};

/* trident specific AC97 functions */
/* Write AC97 codec registers */
static void
trident_ac97_set(struct ac97_codec *codec, u8 reg, u16 val)
{
	struct trident_card *card = (struct trident_card *)codec->private_data;
	unsigned int address, mask, busy;
	unsigned short count = 0xffff;
	unsigned long flags;
	u32 data;

	data = ((u32) val) << 16;

	switch (card->pci_id) {
	default:
	case PCI_DEVICE_ID_SI_7018:
		address = SI_AC97_WRITE;
		mask = SI_AC97_BUSY_WRITE | SI_AC97_AUDIO_BUSY;
		if (codec->id)
			mask |= SI_AC97_SECONDARY;
		busy = SI_AC97_BUSY_WRITE;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
		address = DX_ACR0_AC97_W;
		mask = busy = DX_AC97_BUSY_WRITE;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		address = NX_ACR1_AC97_W;
		mask = NX_AC97_BUSY_WRITE;
		if (codec->id)
			mask |= NX_AC97_WRITE_SECONDARY;
		busy = NX_AC97_BUSY_WRITE;
		break;
	case PCI_DEVICE_ID_INTERG_5050:
		address = SI_AC97_WRITE;
		mask = busy = SI_AC97_BUSY_WRITE;
		if (codec->id)
			mask |= SI_AC97_SECONDARY;
		break;
	}

	spin_lock_irqsave(&card->lock, flags);
	do {
		if ((inw(TRID_REG(card, address)) & busy) == 0)
			break;
	} while (count--);

	data |= (mask | (reg & AC97_REG_ADDR));

	if (count == 0) {
		printk(KERN_ERR "trident: AC97 CODEC write timed out.\n");
		spin_unlock_irqrestore(&card->lock, flags);
		return;
	}

	outl(data, TRID_REG(card, address));
	spin_unlock_irqrestore(&card->lock, flags);
}

/* Read AC97 codec registers */
static u16
trident_ac97_get(struct ac97_codec *codec, u8 reg)
{
	struct trident_card *card = (struct trident_card *)codec->private_data;
	unsigned int address, mask, busy;
	unsigned short count = 0xffff;
	unsigned long flags;
	u32 data;

	switch (card->pci_id) {
	default:
	case PCI_DEVICE_ID_SI_7018:
		address = SI_AC97_READ;
		mask = SI_AC97_BUSY_READ | SI_AC97_AUDIO_BUSY;
		if (codec->id)
			mask |= SI_AC97_SECONDARY;
		busy = SI_AC97_BUSY_READ;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
		address = DX_ACR1_AC97_R;
		mask = busy = DX_AC97_BUSY_READ;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		if (codec->id)
			address = NX_ACR3_AC97_R_SECONDARY;
		else
			address = NX_ACR2_AC97_R_PRIMARY;
		mask = NX_AC97_BUSY_READ;
		busy = NX_AC97_BUSY_READ | NX_AC97_BUSY_DATA;
		break;
	case PCI_DEVICE_ID_INTERG_5050:
		address = SI_AC97_READ;
		mask = busy = SI_AC97_BUSY_READ;
		if (codec->id)
			mask |= SI_AC97_SECONDARY;
		break;
	}

	data = (mask | (reg & AC97_REG_ADDR));

	spin_lock_irqsave(&card->lock, flags);
	outl(data, TRID_REG(card, address));
	do {
		data = inl(TRID_REG(card, address));
		if ((data & busy) == 0)
			break;
	} while (count--);
	spin_unlock_irqrestore(&card->lock, flags);

	if (count == 0) {
		printk(KERN_ERR "trident: AC97 CODEC read timed out.\n");
		data = 0;
	}
	return ((u16) (data >> 16));
}

/* rewrite ac97 read and write mixer register by hulei for ALI*/
static int
acquirecodecaccess(struct trident_card *card)
{
	u16 wsemamask = 0x6000;	/* bit 14..13 */
	u16 wsemabits;
	u16 wcontrol;
	int block = 0;
	int ncount = 25;
	while (1) {
		wcontrol = inw(TRID_REG(card, ALI_AC97_WRITE));
		wsemabits = wcontrol & wsemamask;

		if (wsemabits == 0x4000)
			return 1;	/* 0x4000 is audio ,then success */
		if (ncount-- < 0)
			break;
		if (wsemabits == 0) {
		      unlock:
			outl(((u32) (wcontrol & 0x1eff) | 0x00004000), 
			     TRID_REG(card, ALI_AC97_WRITE));
			continue;
		}
		udelay(20);
	}
	if (!block) {
		pr_debug("accesscodecsemaphore: try unlock\n");
		block = 1;
		goto unlock;
	}
	return 0;
}

static void
releasecodecaccess(struct trident_card *card)
{
	unsigned long wcontrol;
	wcontrol = inl(TRID_REG(card, ALI_AC97_WRITE));
	outl((wcontrol & 0xffff1eff), TRID_REG(card, ALI_AC97_WRITE));
}

static int
waitforstimertick(struct trident_card *card)
{
	unsigned long chk1, chk2;
	unsigned int wcount = 0xffff;
	chk1 = inl(TRID_REG(card, ALI_STIMER));

	while (1) {
		chk2 = inl(TRID_REG(card, ALI_STIMER));
		if ((wcount > 0) && chk1 != chk2)
			return 1;
		if (wcount <= 0)
			break;
		udelay(50);
	}
	return 0;
}

/* Read AC97 codec registers for ALi*/
static u16
ali_ac97_get(struct trident_card *card, int secondary, u8 reg)
{
	unsigned int address, mask;
	unsigned int ncount;
	unsigned long aud_reg;
	u32 data;
	u16 wcontrol;
	unsigned long flags;

	if (!card)
		BUG();

	address = ALI_AC97_READ;
	if (card->revision == ALI_5451_V02) {
		address = ALI_AC97_WRITE;
	}
	mask = ALI_AC97_READ_ACTION | ALI_AC97_AUDIO_BUSY;
	if (secondary)
		mask |= ALI_AC97_SECONDARY;

	spin_lock_irqsave(&card->lock, flags);

	if (!acquirecodecaccess(card))
		printk(KERN_ERR "access codec fail\n");

	wcontrol = inw(TRID_REG(card, ALI_AC97_WRITE));
	wcontrol &= 0xfe00;
	wcontrol |= (0x8000 | reg);
	outw(wcontrol, TRID_REG(card, ALI_AC97_WRITE));

	data = (mask | (reg & AC97_REG_ADDR));

	if (!waitforstimertick(card)) {
		printk(KERN_ERR "ali_ac97_read: BIT_CLOCK is dead\n");
		goto releasecodec;
	}

	udelay(20);

	ncount = 10;

	while (1) {
		if ((inw(TRID_REG(card, ALI_AC97_WRITE)) & ALI_AC97_BUSY_READ) 
		    != 0)
			break;
		if (ncount <= 0)
			break;
		if (ncount-- == 1) {
			pr_debug("ali_ac97_read :try clear busy flag\n");
			aud_reg = inl(TRID_REG(card, ALI_AC97_WRITE));
			outl((aud_reg & 0xffff7fff), 
			     TRID_REG(card, ALI_AC97_WRITE));
		}
		udelay(10);
	}

	data = inl(TRID_REG(card, address));

	spin_unlock_irqrestore(&card->lock, flags);

	return ((u16) (data >> 16));

      releasecodec:
	releasecodecaccess(card);
	spin_unlock_irqrestore(&card->lock, flags);
	printk(KERN_ERR "ali_ac97_read: AC97 CODEC read timed out.\n");
	return 0;
}

/* Write AC97 codec registers for hulei*/
static void
ali_ac97_set(struct trident_card *card, int secondary, u8 reg, u16 val)
{
	unsigned int address, mask;
	unsigned int ncount;
	u32 data;
	u16 wcontrol;
	unsigned long flags;

	data = ((u32) val) << 16;

	if (!card)
		BUG();

	address = ALI_AC97_WRITE;
	mask = ALI_AC97_WRITE_ACTION | ALI_AC97_AUDIO_BUSY;
	if (secondary)
		mask |= ALI_AC97_SECONDARY;
	if (card->revision == ALI_5451_V02)
		mask |= ALI_AC97_WRITE_MIXER_REGISTER;

	spin_lock_irqsave(&card->lock, flags);
	if (!acquirecodecaccess(card))
		printk(KERN_ERR "ali_ac97_write: access codec fail\n");

	wcontrol = inw(TRID_REG(card, ALI_AC97_WRITE));
	wcontrol &= 0xff00;
	wcontrol |= (0x8100 | reg); /* bit 8=1: (ali1535 )reserved/ */ 
	                            /* ali1535+ write */
	outl((data | wcontrol), TRID_REG(card, ALI_AC97_WRITE));

	if (!waitforstimertick(card)) {
		printk(KERN_ERR "BIT_CLOCK is dead\n");
		goto releasecodec;
	}

	ncount = 10;
	while (1) {
		wcontrol = inw(TRID_REG(card, ALI_AC97_WRITE));
		if (!(wcontrol & 0x8000))
			break;
		if (ncount <= 0)
			break;
		if (ncount-- == 1) {
			pr_debug("ali_ac97_set :try clear busy flag!!\n");
			outw(wcontrol & 0x7fff, 
			     TRID_REG(card, ALI_AC97_WRITE));
		}
		udelay(10);
	}

      releasecodec:
	releasecodecaccess(card);
	spin_unlock_irqrestore(&card->lock, flags);
	return;
}

static void
ali_enable_special_channel(struct trident_state *stat)
{
	struct trident_card *card = stat->card;
	unsigned long s_channels;

	s_channels = inl(TRID_REG(card, ALI_GLOBAL_CONTROL));
	s_channels |= (1 << stat->dmabuf.channel->num);
	outl(s_channels, TRID_REG(card, ALI_GLOBAL_CONTROL));
}

static u16
ali_ac97_read(struct ac97_codec *codec, u8 reg)
{
	int id;
	u16 data;
	struct trident_card *card = NULL;

	/* Added by Matt Wu */
	if (!codec)
		BUG();

	card = (struct trident_card *) codec->private_data;

	if (!card->mixer_regs_ready)
		return ali_ac97_get(card, codec->id, reg);

	/*
	 *      FIXME: need to stop this caching some registers
	 */
	if (codec->id)
		id = 1;
	else
		id = 0;

	data = card->mixer_regs[reg / 2][id];
	return data;
}

static void
ali_ac97_write(struct ac97_codec *codec, u8 reg, u16 val)
{
	int id;
	struct trident_card *card;

	/*  Added by Matt Wu */
	if (!codec)
		BUG();

	card = (struct trident_card *) codec->private_data;

	if (!card->mixer_regs_ready) {
		ali_ac97_set(card, codec->id, reg, val);
		return;
	}

	if (codec->id)
		id = 1;
	else
		id = 0;

	card->mixer_regs[reg / 2][id] = val;
	ali_ac97_set(card, codec->id, reg, val);
}

/*
flag:	ALI_SPDIF_OUT_TO_SPDIF_OUT
	ALI_PCM_TO_SPDIF_OUT
*/

static void
ali_setup_spdif_out(struct trident_card *card, int flag)
{
	unsigned long spdif;
	unsigned char ch;

	char temp;
	struct pci_dev *pci_dev = NULL;

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
				 pci_dev);
	if (pci_dev == NULL)
		return;
	pci_read_config_byte(pci_dev, 0x61, &temp);
	temp |= 0x40;
	pci_write_config_byte(pci_dev, 0x61, temp);
	pci_read_config_byte(pci_dev, 0x7d, &temp);
	temp |= 0x01;
	pci_write_config_byte(pci_dev, 0x7d, temp);
	pci_read_config_byte(pci_dev, 0x7e, &temp);
	temp &= (~0x20);
	temp |= 0x10;
	pci_write_config_byte(pci_dev, 0x7e, temp);

	pci_dev_put(pci_dev);

	ch = inb(TRID_REG(card, ALI_SCTRL));
	outb(ch | ALI_SPDIF_OUT_ENABLE, TRID_REG(card, ALI_SCTRL));
	ch = inb(TRID_REG(card, ALI_SPDIF_CTRL));
	outb(ch & ALI_SPDIF_OUT_CH_STATUS, TRID_REG(card, ALI_SPDIF_CTRL));

	if (flag & ALI_SPDIF_OUT_TO_SPDIF_OUT) {
		spdif = inw(TRID_REG(card, ALI_GLOBAL_CONTROL));
		spdif |= ALI_SPDIF_OUT_CH_ENABLE;
		spdif &= ALI_SPDIF_OUT_SEL_SPDIF;
		outw(spdif, TRID_REG(card, ALI_GLOBAL_CONTROL));
		spdif = inw(TRID_REG(card, ALI_SPDIF_CS));
		if (flag & ALI_SPDIF_OUT_NON_PCM)
			spdif |= 0x0002;
		else
			spdif &= (~0x0002);
		outw(spdif, TRID_REG(card, ALI_SPDIF_CS));
	} else {
		spdif = inw(TRID_REG(card, ALI_GLOBAL_CONTROL));
		spdif |= ALI_SPDIF_OUT_SEL_PCM;
		outw(spdif, TRID_REG(card, ALI_GLOBAL_CONTROL));
	}
}

static void
ali_disable_special_channel(struct trident_card *card, int ch)
{
	unsigned long sc;

	sc = inl(TRID_REG(card, ALI_GLOBAL_CONTROL));
	sc &= ~(1 << ch);
	outl(sc, TRID_REG(card, ALI_GLOBAL_CONTROL));
}

static void
ali_disable_spdif_in(struct trident_card *card)
{
	unsigned long spdif;

	spdif = inl(TRID_REG(card, ALI_GLOBAL_CONTROL));
	spdif &= (~ALI_SPDIF_IN_SUPPORT);
	outl(spdif, TRID_REG(card, ALI_GLOBAL_CONTROL));

	ali_disable_special_channel(card, ALI_SPDIF_IN_CHANNEL);
}

static void
ali_setup_spdif_in(struct trident_card *card)
{
	unsigned long spdif;

	//Set SPDIF IN Supported
	spdif = inl(TRID_REG(card, ALI_GLOBAL_CONTROL));
	spdif |= ALI_SPDIF_IN_SUPPORT;
	outl(spdif, TRID_REG(card, ALI_GLOBAL_CONTROL));

	//Set SPDIF IN Rec
	spdif = inl(TRID_REG(card, ALI_GLOBAL_CONTROL));
	spdif |= ALI_SPDIF_IN_CH_ENABLE;
	outl(spdif, TRID_REG(card, ALI_GLOBAL_CONTROL));

	spdif = inb(TRID_REG(card, ALI_SPDIF_CTRL));
	spdif |= ALI_SPDIF_IN_CH_STATUS;
	outb(spdif, TRID_REG(card, ALI_SPDIF_CTRL));
/*
	spdif = inb(TRID_REG(card, ALI_SPDIF_CTRL));
	spdif |= ALI_SPDIF_IN_FUNC_ENABLE;
	outb(spdif, TRID_REG(card, ALI_SPDIF_CTRL));
*/
}

static void
ali_delay(struct trident_card *card, int interval)
{
	unsigned long begintimer, currenttimer;

	begintimer = inl(TRID_REG(card, ALI_STIMER));
	currenttimer = inl(TRID_REG(card, ALI_STIMER));

	while (currenttimer < begintimer + interval)
		currenttimer = inl(TRID_REG(card, ALI_STIMER));
}

static void
ali_detect_spdif_rate(struct trident_card *card)
{
	u16 wval = 0;
	u16 count = 0;
	u8 bval = 0, R1 = 0, R2 = 0;

	bval = inb(TRID_REG(card, ALI_SPDIF_CTRL));
	bval |= 0x02;
	outb(bval, TRID_REG(card, ALI_SPDIF_CTRL));

	bval = inb(TRID_REG(card, ALI_SPDIF_CTRL + 1));
	bval |= 0x1F;
	outb(bval, TRID_REG(card, ALI_SPDIF_CTRL + 1));

	while (((R1 < 0x0B) || (R1 > 0x0E)) && (R1 != 0x12) && 
	       count <= 50000) {
		count++;

		ali_delay(card, 6);

		bval = inb(TRID_REG(card, ALI_SPDIF_CTRL + 1));
		R1 = bval & 0x1F;
	}

	if (count > 50000) {
		printk(KERN_WARNING "trident: Error in "
		       "ali_detect_spdif_rate!\n");
		return;
	}

	count = 0;

	while (count <= 50000) {
		count++;

		ali_delay(card, 6);

		bval = inb(TRID_REG(card, ALI_SPDIF_CTRL + 1));
		R2 = bval & 0x1F;

		if (R2 != R1)
			R1 = R2;
		else
			break;
	}

	if (count > 50000) {
		printk(KERN_WARNING "trident: Error in "
		       "ali_detect_spdif_rate!\n");
		return;
	}

	switch (R2) {
	case 0x0b:
	case 0x0c:
	case 0x0d:
	case 0x0e:
		wval = inw(TRID_REG(card, ALI_SPDIF_CTRL + 2));
		wval &= 0xE0F0;
		wval |= (u16) 0x09 << 8 | (u16) 0x05;
		outw(wval, TRID_REG(card, ALI_SPDIF_CTRL + 2));

		bval = inb(TRID_REG(card, ALI_SPDIF_CS + 3)) & 0xF0;
		outb(bval | 0x02, TRID_REG(card, ALI_SPDIF_CS + 3));
		break;

	case 0x12:
		wval = inw(TRID_REG(card, ALI_SPDIF_CTRL + 2));
		wval &= 0xE0F0;
		wval |= (u16) 0x0E << 8 | (u16) 0x08;
		outw(wval, TRID_REG(card, ALI_SPDIF_CTRL + 2));

		bval = inb(TRID_REG(card, ALI_SPDIF_CS + 3)) & 0xF0;
		outb(bval | 0x03, TRID_REG(card, ALI_SPDIF_CS + 3));
		break;

	default:
		break;
	}

}

static unsigned int
ali_get_spdif_in_rate(struct trident_card *card)
{
	u32 dwRate = 0;
	u8 bval = 0;

	ali_detect_spdif_rate(card);

	bval = inb(TRID_REG(card, ALI_SPDIF_CTRL));
	bval &= 0x7F;
	bval |= 0x40;
	outb(bval, TRID_REG(card, ALI_SPDIF_CTRL));

	bval = inb(TRID_REG(card, ALI_SPDIF_CS + 3));
	bval &= 0x0F;

	switch (bval) {
	case 0:
		dwRate = 44100;
		break;
	case 1:
		dwRate = 48000;
		break;
	case 2:
		dwRate = 32000;
		break;
	default:
		// Error occurs
		break;
	}

	return dwRate;

}

static int
ali_close_multi_channels(void)
{
	char temp = 0;
	struct pci_dev *pci_dev = NULL;

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
				 pci_dev);
	if (pci_dev == NULL)
		return -1;

	pci_read_config_byte(pci_dev, 0x59, &temp);
	temp &= ~0x80;
	pci_write_config_byte(pci_dev, 0x59, temp);

	pci_dev_put(pci_dev);

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
				 NULL);
	if (pci_dev == NULL)
		return -1;

	pci_read_config_byte(pci_dev, 0xB8, &temp);
	temp &= ~0x20;
	pci_write_config_byte(pci_dev, 0xB8, temp);

	pci_dev_put(pci_dev);

	return 0;
}

static int
ali_setup_multi_channels(struct trident_card *card, int chan_nums)
{
	unsigned long dwValue;
	char temp = 0;
	struct pci_dev *pci_dev = NULL;

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
				 pci_dev);
	if (pci_dev == NULL)
		return -1;
	pci_read_config_byte(pci_dev, 0x59, &temp);
	temp |= 0x80;
	pci_write_config_byte(pci_dev, 0x59, temp);

	pci_dev_put(pci_dev);

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
				 NULL);
	if (pci_dev == NULL)
		return -1;
	pci_read_config_byte(pci_dev, (int) 0xB8, &temp);
	temp |= 0x20;
	pci_write_config_byte(pci_dev, (int) 0xB8, (u8) temp);

	pci_dev_put(pci_dev);

	if (chan_nums == 6) {
		dwValue = inl(TRID_REG(card, ALI_SCTRL)) | 0x000f0000;
		outl(dwValue, TRID_REG(card, ALI_SCTRL));
		mdelay(4);
		dwValue = inl(TRID_REG(card, ALI_SCTRL));
		if (dwValue & 0x2000000) {
			ali_ac97_write(card->ac97_codec[0], 0x02, 8080);
			ali_ac97_write(card->ac97_codec[0], 0x36, 0);
			ali_ac97_write(card->ac97_codec[0], 0x38, 0);
			/*
			 *      On a board with a single codec you won't get the
			 *      surround. On other boards configure it.
			 */
			if (card->ac97_codec[1] != NULL) {
				ali_ac97_write(card->ac97_codec[1], 0x36, 0);
				ali_ac97_write(card->ac97_codec[1], 0x38, 0);
				ali_ac97_write(card->ac97_codec[1], 0x02, 0x0606);
				ali_ac97_write(card->ac97_codec[1], 0x18, 0x0303);
				ali_ac97_write(card->ac97_codec[1], 0x74, 0x3);
			}
			return 1;
		}
	}
	return -EINVAL;
}

static void
ali_free_pcm_channel(struct trident_card *card, unsigned int channel)
{
	int bank;

	if (channel > 31)
		return;

	bank = channel >> 5;
	channel = channel & 0x1f;

	card->banks[bank].bitmap &= ~(1 << (channel));
}

static int
ali_allocate_other_states_resources(struct trident_state *state, int chan_nums)
{
	struct trident_card *card = state->card;
	struct trident_state *s;
	int i, state_count = 0;
	struct trident_pcm_bank *bank;
	struct trident_channel *channel;
	unsigned long num;

	bank = &card->banks[BANK_A];

	if (chan_nums != 6)
		return 0;

	for (i = 0; (i < ALI_CHANNELS) && (state_count != 4); i++) {
		if (card->states[i])
			continue;

		num = ali_multi_channels_5_1[state_count];
		if (!(bank->bitmap & (1 << num))) {
			bank->bitmap |= 1 << num;
			channel = &bank->channels[num];
			channel->num = num;
		} else {
			state_count--;
			for (; state_count >= 0; state_count--) {
				kfree(state->other_states[state_count]);
				num = ali_multi_channels_5_1[state_count];
					ali_free_pcm_channel(card, num);
			}
			return -EBUSY;
		}
		s = card->states[i] = kmalloc(sizeof(*state), GFP_KERNEL);
		if (!s) {
			num = ali_multi_channels_5_1[state_count];
			ali_free_pcm_channel(card, num);
			state_count--;
			for (; state_count >= 0; state_count--) {
				num = ali_multi_channels_5_1[state_count];
				ali_free_pcm_channel(card, num);
				kfree(state->other_states[state_count]);
			}
			return -ENOMEM;
		}
		memset(s, 0, sizeof(*state));

		s->dmabuf.channel = channel;
		s->dmabuf.ossfragshift = s->dmabuf.ossmaxfrags =
			s->dmabuf.subdivision = 0;
		init_waitqueue_head(&s->dmabuf.wait);
		s->magic = card->magic;
		s->card = card;
		s->virt = i;
		ali_enable_special_channel(s);
		state->other_states[state_count++] = s;
	}

	if (state_count != 4) {
		state_count--;
		for (; state_count >= 0; state_count--) {
			kfree(state->other_states[state_count]);
			num = ali_multi_channels_5_1[state_count];
			ali_free_pcm_channel(card, num);
		}
		return -EBUSY;
	}
	return 0;
}

#ifdef CONFIG_PM
/* save registers for ALi Power Management */
static struct ali_saved_registers {
	unsigned long global_regs[ALI_GLOBAL_REGS];
	unsigned long channel_regs[ALI_CHANNELS][ALI_CHANNEL_REGS];
	unsigned mixer_regs[ALI_MIXER_REGS];
} ali_registers;

static void
ali_save_regs(struct trident_card *card)
{
	unsigned long flags;
	int i, j;

	spin_lock_irqsave(&card->lock, flags);

	ali_registers.global_regs[0x2c] = inl(TRID_REG(card, T4D_MISCINT));
	//ali_registers.global_regs[0x20] = inl(TRID_REG(card,T4D_START_A));    
	ali_registers.global_regs[0x21] = inl(TRID_REG(card, T4D_STOP_A));

	//disable all IRQ bits
	outl(ALI_DISABLE_ALL_IRQ, TRID_REG(card, T4D_MISCINT));

	for (i = 1; i < ALI_MIXER_REGS; i++)
		ali_registers.mixer_regs[i] = ali_ac97_read(card->ac97_codec[0], 
							    i * 2);

	for (i = 0; i < ALI_GLOBAL_REGS; i++) {
		if ((i * 4 == T4D_MISCINT) || (i * 4 == T4D_STOP_A))
			continue;
		ali_registers.global_regs[i] = inl(TRID_REG(card, i * 4));
	}

	for (i = 0; i < ALI_CHANNELS; i++) {
		outb(i, TRID_REG(card, T4D_LFO_GC_CIR));
		for (j = 0; j < ALI_CHANNEL_REGS; j++)
			ali_registers.channel_regs[i][j] = inl(TRID_REG(card, 
									j * 4 + 0xe0));
	}

	//Stop all HW channel
	outl(ALI_STOP_ALL_CHANNELS, TRID_REG(card, T4D_STOP_A));

	spin_unlock_irqrestore(&card->lock, flags);
}

static void
ali_restore_regs(struct trident_card *card)
{
	unsigned long flags;
	int i, j;

	spin_lock_irqsave(&card->lock, flags);

	for (i = 1; i < ALI_MIXER_REGS; i++)
		ali_ac97_write(card->ac97_codec[0], i * 2, 
			       ali_registers.mixer_regs[i]);

	for (i = 0; i < ALI_CHANNELS; i++) {
		outb(i, TRID_REG(card, T4D_LFO_GC_CIR));
		for (j = 0; j < ALI_CHANNEL_REGS; j++)
			outl(ali_registers.channel_regs[i][j], 
			     TRID_REG(card, j * 4 + 0xe0));
	}

	for (i = 0; i < ALI_GLOBAL_REGS; i++) {
		if ((i * 4 == T4D_MISCINT) || (i * 4 == T4D_STOP_A) || 
		    (i * 4 == T4D_START_A))
			continue;
		outl(ali_registers.global_regs[i], TRID_REG(card, i * 4));
	}

	//start HW channel
	outl(ali_registers.global_regs[0x20], TRID_REG(card, T4D_START_A));
	//restore IRQ enable bits
	outl(ali_registers.global_regs[0x2c], TRID_REG(card, T4D_MISCINT));

	spin_unlock_irqrestore(&card->lock, flags);
}

static int
trident_suspend(struct pci_dev *dev, pm_message_t unused)
{
	struct trident_card *card = pci_get_drvdata(dev);

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		ali_save_regs(card);
	}
	return 0;
}

static int
trident_resume(struct pci_dev *dev)
{
	struct trident_card *card = pci_get_drvdata(dev);

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		ali_restore_regs(card);
	}
	return 0;
}
#endif

static struct trident_channel *
ali_alloc_pcm_channel(struct trident_card *card)
{
	struct trident_pcm_bank *bank;
	int idx;

	bank = &card->banks[BANK_A];

	if (inl(TRID_REG(card, ALI_GLOBAL_CONTROL)) & 
	    (ALI_SPDIF_OUT_CH_ENABLE)) {
		idx = ALI_SPDIF_OUT_CHANNEL;
		if (!(bank->bitmap & (1 << idx))) {
			struct trident_channel *channel = &bank->channels[idx];
			bank->bitmap |= 1 << idx;
			channel->num = idx;
			return channel;
		}
	}

	for (idx = ALI_PCM_OUT_CHANNEL_FIRST; idx <= ALI_PCM_OUT_CHANNEL_LAST; 
	     idx++) {
		if (!(bank->bitmap & (1 << idx))) {
			struct trident_channel *channel = &bank->channels[idx];
			bank->bitmap |= 1 << idx;
			channel->num = idx;
			return channel;
		}
	}

	/* no more free channels avaliable */
#if 0 
	printk(KERN_ERR "ali: no more channels available on Bank A.\n");
#endif /* 0 */ 
	return NULL;
}

static struct trident_channel *
ali_alloc_rec_pcm_channel(struct trident_card *card)
{
	struct trident_pcm_bank *bank;
	int idx;

	if (inl(TRID_REG(card, ALI_GLOBAL_CONTROL)) & ALI_SPDIF_IN_SUPPORT)
		idx = ALI_SPDIF_IN_CHANNEL;
	else
		idx = ALI_PCM_IN_CHANNEL;

	bank = &card->banks[BANK_A];

	if (!(bank->bitmap & (1 << idx))) {
		struct trident_channel *channel = &bank->channels[idx];
		bank->bitmap |= 1 << idx;
		channel->num = idx;
		return channel;
	}

	/* no free recordable channels avaliable */
#if 0 
	printk(KERN_ERR "ali: no recordable channels available on Bank A.\n");
#endif /* 0 */ 
	return NULL;
}

static void
ali_set_spdif_out_rate(struct trident_card *card, unsigned int rate)
{
	unsigned char ch_st_sel;
	unsigned short status_rate;

	switch (rate) {
	case 44100:
		status_rate = 0;
		break;
	case 32000:
		status_rate = 0x300;
		break;
	case 48000:
	default:
		status_rate = 0x200;
		break;
	}

	/* select spdif_out */ 
	ch_st_sel = inb(TRID_REG(card, ALI_SPDIF_CTRL)) & ALI_SPDIF_OUT_CH_STATUS;

	ch_st_sel |= 0x80;	/* select right */ 
	outb(ch_st_sel, TRID_REG(card, ALI_SPDIF_CTRL));
	outb(status_rate | 0x20, TRID_REG(card, ALI_SPDIF_CS + 2));

	ch_st_sel &= (~0x80);	/* select left */ 
	outb(ch_st_sel, TRID_REG(card, ALI_SPDIF_CTRL));
	outw(status_rate | 0x10, TRID_REG(card, ALI_SPDIF_CS + 2));
}

static void
ali_address_interrupt(struct trident_card *card)
{
	int i, channel;
	struct trident_state *state;
	u32 mask, channel_mask;

	mask = trident_get_interrupt_mask(card, 0);
	for (i = 0; i < NR_HW_CH; i++) {
		if ((state = card->states[i]) == NULL)
			continue;
		channel = state->dmabuf.channel->num;
		if ((channel_mask = 1 << channel) & mask) {
			mask &= ~channel_mask;
			trident_ack_channel_interrupt(card, channel);
			udelay(100);
			state->dmabuf.update_flag |= ALI_ADDRESS_INT_UPDATE;
			trident_update_ptr(state);
		}
	}
	if (mask) {
		for (i = 0; i < NR_HW_CH; i++) {
			if (mask & (1 << i)) {
				printk("ali: spurious channel irq %d.\n", i);
				trident_ack_channel_interrupt(card, i);
				trident_stop_voice(card, i);
				trident_disable_voice_irq(card, i);
			}
		}
	}
}

/* Updating the values of counters of other_states' DMAs without lock 
protection is no harm because all DMAs of multi-channels and interrupt
depend on a master state's DMA, and changing the counters of the master
state DMA is protected by a spinlock.
*/
static int
ali_write_5_1(struct trident_state *state, const char __user *buf, 
	      int cnt_for_multi_channel, unsigned int *copy_count, 
	      unsigned int *state_cnt)
{

	struct dmabuf *dmabuf = &state->dmabuf;
	struct dmabuf *dmabuf_temp;
	const char __user *buffer = buf;
	unsigned swptr, other_dma_nums, sample_s;
	unsigned int i, loop;

	other_dma_nums = 4;
	sample_s = sample_size[dmabuf->fmt] >> 1;
	swptr = dmabuf->swptr;

	if ((i = state->multi_channels_adjust_count) > 0) {
		if (i == 1) {
			if (copy_from_user(dmabuf->rawbuf + swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);
			i--;
			(*state_cnt) += sample_s;
			state->multi_channels_adjust_count++;
		} else
			i = i - (state->chans_num - other_dma_nums);
		for (; (i < other_dma_nums) && (cnt_for_multi_channel > 0); i++) {
			dmabuf_temp = &state->other_states[i]->dmabuf;
			if (copy_from_user(dmabuf_temp->rawbuf + dmabuf_temp->swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(dmabuf_temp->swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);
		}
		if (cnt_for_multi_channel == 0)
			state->multi_channels_adjust_count += i;
	}
	if (cnt_for_multi_channel > 0) {
		loop = cnt_for_multi_channel / (state->chans_num * sample_s);
		for (i = 0; i < loop; i++) {
			if (copy_from_user(dmabuf->rawbuf + swptr, buffer, 
					   sample_s * 2))
				return -EFAULT;
			seek_offset(swptr, buffer, cnt_for_multi_channel, 
				    sample_s * 2, *copy_count);
			(*state_cnt) += (sample_s * 2);

			dmabuf_temp = &state->other_states[0]->dmabuf;
			if (copy_from_user(dmabuf_temp->rawbuf + dmabuf_temp->swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(dmabuf_temp->swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);

			dmabuf_temp = &state->other_states[1]->dmabuf;
			if (copy_from_user(dmabuf_temp->rawbuf + dmabuf_temp->swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(dmabuf_temp->swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);

			dmabuf_temp = &state->other_states[2]->dmabuf;
			if (copy_from_user(dmabuf_temp->rawbuf + dmabuf_temp->swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(dmabuf_temp->swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);

			dmabuf_temp = &state->other_states[3]->dmabuf;
			if (copy_from_user(dmabuf_temp->rawbuf + dmabuf_temp->swptr, 
					   buffer, sample_s))
				return -EFAULT;
			seek_offset(dmabuf_temp->swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);
		}

		if (cnt_for_multi_channel > 0) {
			state->multi_channels_adjust_count = cnt_for_multi_channel / sample_s;

			if (copy_from_user(dmabuf->rawbuf + swptr, buffer, sample_s))
				return -EFAULT;
			seek_offset(swptr, buffer, cnt_for_multi_channel, 
				    sample_s, *copy_count);
			(*state_cnt) += sample_s;

			if (cnt_for_multi_channel > 0) {
				if (copy_from_user(dmabuf->rawbuf + swptr, 
						   buffer, sample_s))
					return -EFAULT;
				seek_offset(swptr, buffer, cnt_for_multi_channel, 
					    sample_s, *copy_count);
				(*state_cnt) += sample_s;

				if (cnt_for_multi_channel > 0) {
					int diff = state->chans_num - other_dma_nums;
					loop = state->multi_channels_adjust_count - diff;
					for (i = 0; i < loop; i++) {
						dmabuf_temp = &state->other_states[i]->dmabuf;
						if (copy_from_user(dmabuf_temp->rawbuf + 
								   dmabuf_temp->swptr, 
								   buffer, sample_s))
							return -EFAULT;
						seek_offset(dmabuf_temp->swptr, buffer, 
							    cnt_for_multi_channel, 
							    sample_s, *copy_count);
					}
				}
			}
		} else
			state->multi_channels_adjust_count = 0;
	}
	for (i = 0; i < other_dma_nums; i++) {
		dmabuf_temp = &state->other_states[i]->dmabuf;
		dmabuf_temp->swptr = dmabuf_temp->swptr % dmabuf_temp->dmasize;
	}
	return *state_cnt;
}

static void
ali_free_other_states_resources(struct trident_state *state)
{
	int i;
	struct trident_card *card = state->card;
	struct trident_state *s;
	unsigned other_states_count;

	other_states_count = state->chans_num - 2; /* except PCM L/R channels */
	for (i = 0; i < other_states_count; i++) {
		s = state->other_states[i];
		dealloc_dmabuf(&s->dmabuf, card->pci_dev);
		ali_disable_special_channel(s->card, s->dmabuf.channel->num);
		state->card->free_pcm_channel(s->card, s->dmabuf.channel->num);
		card->states[s->virt] = NULL;
		kfree(s);
	}
}

static struct proc_dir_entry *res;

static int
ali_write_proc(struct file *file, const char __user *buffer, unsigned long count, void *data)
{
	struct trident_card *card = (struct trident_card *) data;
	unsigned long flags;
	char c;

	if (count < 0)
		return -EINVAL;
	if (count == 0)
		return 0;
	if (get_user(c, buffer))
		return -EFAULT;

	spin_lock_irqsave(&card->lock, flags);
	switch (c) {
	case '0':
		ali_setup_spdif_out(card, ALI_PCM_TO_SPDIF_OUT);
		ali_disable_special_channel(card, ALI_SPDIF_OUT_CHANNEL);
		break;
	case '1':
		ali_setup_spdif_out(card, ALI_SPDIF_OUT_TO_SPDIF_OUT | 
				    ALI_SPDIF_OUT_PCM);
		break;
	case '2':
		ali_setup_spdif_out(card, ALI_SPDIF_OUT_TO_SPDIF_OUT | 
				    ALI_SPDIF_OUT_NON_PCM);
		break;
	case '3':
		ali_disable_spdif_in(card);	//default
		break;
	case '4':
		ali_setup_spdif_in(card);
		break;
	}
	spin_unlock_irqrestore(&card->lock, flags);

	return count;
}

/* OSS /dev/mixer file operation methods */
static int
trident_open_mixdev(struct inode *inode, struct file *file)
{
	int i = 0;
	int minor = iminor(inode);
	struct trident_card *card = devs;

	for (card = devs; card != NULL; card = card->next)
		for (i = 0; i < NR_AC97; i++)
			if (card->ac97_codec[i] != NULL && 
			    card->ac97_codec[i]->dev_mixer == minor)
				goto match;

	if (!card) {
		return -ENODEV;
	}
      match:
	file->private_data = card->ac97_codec[i];

	return nonseekable_open(inode, file);
}

static int
trident_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd, 
		     unsigned long arg)
{
	struct ac97_codec *codec = (struct ac97_codec *) file->private_data;

	return codec->mixer_ioctl(codec, cmd, arg);
}

static /*const */ struct file_operations trident_mixer_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.ioctl = trident_ioctl_mixdev,
	.open = trident_open_mixdev,
};

static int
ali_reset_5451(struct trident_card *card)
{
	struct pci_dev *pci_dev = NULL;
	unsigned int dwVal;
	unsigned short wCount, wReg;

	pci_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
				 pci_dev);
	if (pci_dev == NULL)
		return -1;

	pci_read_config_dword(pci_dev, 0x7c, &dwVal);
	pci_write_config_dword(pci_dev, 0x7c, dwVal | 0x08000000);
	udelay(5000);
	pci_read_config_dword(pci_dev, 0x7c, &dwVal);
	pci_write_config_dword(pci_dev, 0x7c, dwVal & 0xf7ffffff);
	udelay(5000);
	pci_dev_put(pci_dev);

	pci_dev = card->pci_dev;
	if (pci_dev == NULL)
		return -1;

	pci_read_config_dword(pci_dev, 0x44, &dwVal);
	pci_write_config_dword(pci_dev, 0x44, dwVal | 0x000c0000);
	udelay(500);
	pci_read_config_dword(pci_dev, 0x44, &dwVal);
	pci_write_config_dword(pci_dev, 0x44, dwVal & 0xfffbffff);
	udelay(5000);

	/* TODO: recognize if we have a PM capable codec and only do this */
	/* if the codec is PM capable */
	wCount = 2000;
	while (wCount--) {
		wReg = ali_ac97_get(card, 0, AC97_POWER_CONTROL);
		if ((wReg & 0x000f) == 0x000f)
			return 0;
		udelay(5000);
	}
	/* This is non fatal if you have a non PM capable codec.. */
	return 0;
}

/* AC97 codec initialisation. */
static int __devinit
trident_ac97_init(struct trident_card *card)
{
	int num_ac97 = 0;
	unsigned long ready_2nd = 0;
	struct ac97_codec *codec;
	int i = 0;

	/* initialize controller side of AC link, and find out if secondary codes
	   really exist */
	switch (card->pci_id) {
	case PCI_DEVICE_ID_ALI_5451:
		if (ali_reset_5451(card)) {
			printk(KERN_ERR "trident_ac97_init: error "
			       "resetting 5451.\n");
			return -1;
		}
		outl(0x80000001, TRID_REG(card, ALI_GLOBAL_CONTROL));
		outl(0x00000000, TRID_REG(card, T4D_AINTEN_A));
		outl(0xffffffff, TRID_REG(card, T4D_AINT_A));
		outl(0x00000000, TRID_REG(card, T4D_MUSICVOL_WAVEVOL));
		outb(0x10, TRID_REG(card, ALI_MPUR2));
		ready_2nd = inl(TRID_REG(card, ALI_SCTRL));
		ready_2nd &= 0x3fff;
		outl(ready_2nd | PCMOUT | 0x8000, TRID_REG(card, ALI_SCTRL));
		ready_2nd = inl(TRID_REG(card, ALI_SCTRL));
		ready_2nd &= SI_AC97_SECONDARY_READY;
		if (card->revision < ALI_5451_V02)
			ready_2nd = 0;
		break;
	case PCI_DEVICE_ID_SI_7018:
		/* disable AC97 GPIO interrupt */
		outl(0x00, TRID_REG(card, SI_AC97_GPIO));
		/* when power up the AC link is in cold reset mode so stop it */
		outl(PCMOUT | SURROUT | CENTEROUT | LFEOUT | SECONDARY_ID, 
		     TRID_REG(card, SI_SERIAL_INTF_CTRL));
		/* it take a long time to recover from a cold reset */ 
		/* (especially when you have more than one codec) */
		udelay(2000);
		ready_2nd = inl(TRID_REG(card, SI_SERIAL_INTF_CTRL));
		ready_2nd &= SI_AC97_SECONDARY_READY;
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
		/* playback on */
		outl(DX_AC97_PLAYBACK, TRID_REG(card, DX_ACR2_AC97_COM_STAT));
		break;
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		/* enable AC97 Output Slot 3,4 (PCM Left/Right Playback) */
		outl(NX_AC97_PCM_OUTPUT, TRID_REG(card, NX_ACR0_AC97_COM_STAT));
		ready_2nd = inl(TRID_REG(card, NX_ACR0_AC97_COM_STAT));
		ready_2nd &= NX_AC97_SECONDARY_READY;
		break;
	case PCI_DEVICE_ID_INTERG_5050:
		/* disable AC97 GPIO interrupt */
		outl(0x00, TRID_REG(card, SI_AC97_GPIO));
		/* when power up, the AC link is in cold reset mode, so stop it */
		outl(PCMOUT | SURROUT | CENTEROUT | LFEOUT, 
		     TRID_REG(card, SI_SERIAL_INTF_CTRL));
		/* it take a long time to recover from a cold reset (especially */ 
		/* when you have more than one codec) */
		udelay(2000);
		ready_2nd = inl(TRID_REG(card, SI_SERIAL_INTF_CTRL));
		ready_2nd &= SI_AC97_SECONDARY_READY;
		break;
	}

	for (num_ac97 = 0; num_ac97 < NR_AC97; num_ac97++) {
		if ((codec = ac97_alloc_codec()) == NULL)
			return -ENOMEM;

		/* initialize some basic codec information, other fields */ 
		/* will be filled in ac97_probe_codec */
		codec->private_data = card;
		codec->id = num_ac97;

		if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
			codec->codec_read = ali_ac97_read;
			codec->codec_write = ali_ac97_write;
		} else {
			codec->codec_read = trident_ac97_get;
			codec->codec_write = trident_ac97_set;
		}

		if (ac97_probe_codec(codec) == 0)
			break;

		codec->dev_mixer = register_sound_mixer(&trident_mixer_fops, -1);
		if (codec->dev_mixer < 0) {
			printk(KERN_ERR "trident: couldn't register mixer!\n");
			ac97_release_codec(codec);
			break;
		}

		card->ac97_codec[num_ac97] = codec;

		/* if there is no secondary codec at all, don't probe any more */
		if (!ready_2nd)
			break;
	}

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		for (num_ac97 = 0; num_ac97 < NR_AC97; num_ac97++) {
			if (card->ac97_codec[num_ac97] == NULL)
				break;
			for (i = 0; i < 64; i++) {
				u16 reg = ali_ac97_get(card, num_ac97, i * 2);
				card->mixer_regs[i][num_ac97] = reg;
			}
		}
	}
	return num_ac97 + 1;
}

#ifdef SUPPORT_JOYSTICK
/* Gameport functions for the cards ADC gameport */

static unsigned char trident_game_read(struct gameport *gameport)
{
	struct trident_card *card = gameport->port_data;

	return inb(TRID_REG(card, T4D_GAME_LEG));
}

static void trident_game_trigger(struct gameport *gameport)
{
	struct trident_card *card = gameport->port_data;

	outb(0xff, TRID_REG(card, T4D_GAME_LEG));
}

static int trident_game_cooked_read(struct gameport *gameport,
				    int *axes, int *buttons)
{
	struct trident_card *card = gameport->port_data;
	int i;

	*buttons = (~inb(TRID_REG(card, T4D_GAME_LEG)) >> 4) & 0xf;

	for (i = 0; i < 4; i++) {
		axes[i] = inw(TRID_REG(card, T4D_GAME_AXD) + i * sizeof (u16));
		if (axes[i] == 0xffff)
			axes[i] = -1;
	}

	return 0;
}

static int trident_game_open(struct gameport *gameport, int mode)
{
	struct trident_card *card = gameport->port_data;

	switch (mode) {
	case GAMEPORT_MODE_COOKED:
		outb(0x80, TRID_REG(card, T4D_GAME_CR));
		msleep(20);
		return 0;
	case GAMEPORT_MODE_RAW:
		outb(0x00, TRID_REG(card, T4D_GAME_CR));
		return 0;
	default:
		return -1;
	}

	return 0;
}

static int __devinit trident_register_gameport(struct trident_card *card)
{
	struct gameport *gp;

	card->gameport = gp = gameport_allocate_port();
	if (!gp) {
		printk(KERN_ERR "trident: can not allocate memory for gameport\n");
		return -ENOMEM;
	}

	gameport_set_name(gp, "Trident 4DWave");
	gameport_set_phys(gp, "pci%s/gameport0", pci_name(card->pci_dev));
	gp->read = trident_game_read;
	gp->trigger = trident_game_trigger;
	gp->cooked_read = trident_game_cooked_read;
	gp->open = trident_game_open;
	gp->fuzz = 64;
	gp->port_data = card;

	gameport_register_port(gp);

	return 0;
}

static inline void trident_unregister_gameport(struct trident_card *card)
{
	if (card->gameport)
		gameport_unregister_port(card->gameport);
}

#else
static inline int trident_register_gameport(struct trident_card *card) { return -ENOSYS; }
static inline void trident_unregister_gameport(struct trident_card *card) { }
#endif /* SUPPORT_JOYSTICK */

/* install the driver, we do not allocate hardware channel nor DMA buffer */ 
/* now, they are defered until "ACCESS" time (in prog_dmabuf called by */ 
/* open/read/write/ioctl/mmap) */
static int __devinit
trident_probe(struct pci_dev *pci_dev, const struct pci_device_id *pci_id)
{
	unsigned long iobase;
	struct trident_card *card;
	u8 bits;
	u8 revision;
	int i = 0;
	u16 temp;
	struct pci_dev *pci_dev_m1533 = NULL;
	int rc = -ENODEV;
	u64 dma_mask;

	if (pci_enable_device(pci_dev))
		goto out;

	if (pci_dev->device == PCI_DEVICE_ID_ALI_5451)
		dma_mask = ALI_DMA_MASK;
	else
		dma_mask = TRIDENT_DMA_MASK;
	if (pci_set_dma_mask(pci_dev, dma_mask)) {
		printk(KERN_ERR "trident: architecture does not support" 
		       " %s PCI busmaster DMA\n", 
		       pci_dev->device == PCI_DEVICE_ID_ALI_5451 ? 
		       "32-bit" : "30-bit");
		goto out;
	}
	pci_read_config_byte(pci_dev, PCI_CLASS_REVISION, &revision);

	if (pci_id->device == PCI_DEVICE_ID_INTERG_5050)
		iobase = pci_resource_start(pci_dev, 1);
	else
		iobase = pci_resource_start(pci_dev, 0);

	if (!request_region(iobase, 256, card_names[pci_id->driver_data])) {
		printk(KERN_ERR "trident: can't allocate I/O space at "
		       "0x%4.4lx\n", iobase);
		goto out;
	}

	rc = -ENOMEM;
	if ((card = kmalloc(sizeof(*card), GFP_KERNEL)) == NULL) {
		printk(KERN_ERR "trident: out of memory\n");
		goto out_release_region;
	}
	memset(card, 0, sizeof (*card));

	init_timer(&card->timer);
	card->iobase = iobase;
	card->pci_dev = pci_dev_get(pci_dev);
	card->pci_id = pci_id->device;
	card->revision = revision;
	card->irq = pci_dev->irq;
	card->next = devs;
	card->magic = TRIDENT_CARD_MAGIC;
	card->banks[BANK_A].addresses = &bank_a_addrs;
	card->banks[BANK_A].bitmap = 0UL;
	card->banks[BANK_B].addresses = &bank_b_addrs;
	card->banks[BANK_B].bitmap = 0UL;

	mutex_init(&card->open_mutex);
	spin_lock_init(&card->lock);
	init_timer(&card->timer);

	devs = card;

	pci_set_master(pci_dev);

	printk(KERN_INFO "trident: %s found at IO 0x%04lx, IRQ %d\n", 
	       card_names[pci_id->driver_data], card->iobase, card->irq);

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		/* ALi channel Management */
		card->alloc_pcm_channel = ali_alloc_pcm_channel;
		card->alloc_rec_pcm_channel = ali_alloc_rec_pcm_channel;
		card->free_pcm_channel = ali_free_pcm_channel;

		card->address_interrupt = ali_address_interrupt;

		/* Added by Matt Wu 01-05-2001 for spdif in */
		card->multi_channel_use_count = 0;
		card->rec_channel_use_count = 0;

		/* ALi SPDIF OUT function */
		if (card->revision == ALI_5451_V02) {
			ali_setup_spdif_out(card, ALI_PCM_TO_SPDIF_OUT);
			res = create_proc_entry("ALi5451", 0, NULL);
			if (res) {
				res->write_proc = ali_write_proc;
				res->data = card;
			}
		}

		/* Add H/W Volume Control By Matt Wu Jul. 06, 2001 */
		card->hwvolctl = 0;
		pci_dev_m1533 = pci_find_device(PCI_VENDOR_ID_AL, 
						PCI_DEVICE_ID_AL_M1533, 
						pci_dev_m1533);
		rc = -ENODEV;
		if (pci_dev_m1533 == NULL)
			goto out_proc_fs;
		pci_read_config_byte(pci_dev_m1533, 0x63, &bits);
		if (bits & (1 << 5))
			card->hwvolctl = 1;
		if (card->hwvolctl) {
			/* Clear m1533 pci cfg 78h bit 30 to zero, which makes
			   GPIO11/12/13 work as ACGP_UP/DOWN/MUTE. */
			pci_read_config_byte(pci_dev_m1533, 0x7b, &bits);
			bits &= 0xbf;	/*clear bit 6 */
			pci_write_config_byte(pci_dev_m1533, 0x7b, bits);
		}
	} else if (card->pci_id == PCI_DEVICE_ID_INTERG_5050) {
		card->alloc_pcm_channel = cyber_alloc_pcm_channel;
		card->alloc_rec_pcm_channel = cyber_alloc_pcm_channel;
		card->free_pcm_channel = cyber_free_pcm_channel;
		card->address_interrupt = cyber_address_interrupt;
		cyber_init_ritual(card);
	} else {
		card->alloc_pcm_channel = trident_alloc_pcm_channel;
		card->alloc_rec_pcm_channel = trident_alloc_pcm_channel;
		card->free_pcm_channel = trident_free_pcm_channel;
		card->address_interrupt = trident_address_interrupt;
	}

	/* claim our irq */
	rc = -ENODEV;
	if (request_irq(card->irq, &trident_interrupt, IRQF_SHARED,
			card_names[pci_id->driver_data], card)) {
		printk(KERN_ERR "trident: unable to allocate irq %d\n", 
		       card->irq);
		goto out_proc_fs;
	}
	/* register /dev/dsp */
	if ((card->dev_audio = register_sound_dsp(&trident_audio_fops, -1)) < 0) {
		printk(KERN_ERR "trident: couldn't register DSP device!\n");
		goto out_free_irq;
	}
	card->mixer_regs_ready = 0;
	/* initialize AC97 codec and register /dev/mixer */
	if (trident_ac97_init(card) <= 0) {
		/* unregister audio devices */
		for (i = 0; i < NR_AC97; i++) {
			if (card->ac97_codec[i] != NULL) {
				struct ac97_codec* codec = card->ac97_codec[i];
				unregister_sound_mixer(codec->dev_mixer);
				ac97_release_codec(codec);
			}
		}
		goto out_unregister_sound_dsp;
	}
	card->mixer_regs_ready = 1;
	outl(0x00, TRID_REG(card, T4D_MUSICVOL_WAVEVOL));

	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		/* Add H/W Volume Control By Matt Wu Jul. 06, 2001 */
		if (card->hwvolctl) {
			/* Enable GPIO IRQ (MISCINT bit 18h) */
			temp = inw(TRID_REG(card, T4D_MISCINT + 2));
			temp |= 0x0004;
			outw(temp, TRID_REG(card, T4D_MISCINT + 2));

			/* Enable H/W Volume Control GLOVAL CONTROL bit 0 */
			temp = inw(TRID_REG(card, ALI_GLOBAL_CONTROL));
			temp |= 0x0001;
			outw(temp, TRID_REG(card, ALI_GLOBAL_CONTROL));

		}
		if (card->revision == ALI_5451_V02)
			ali_close_multi_channels();
		/* edited by HMSEO for GT sound */
#if defined(CONFIG_ALPHA_NAUTILUS) || defined(CONFIG_ALPHA_GENERIC)
		{
			u16 ac97_data;
			extern struct hwrpb_struct *hwrpb;

			if ((hwrpb->sys_type) == 201) {
				printk(KERN_INFO "trident: Running on Alpha system "
				       "type Nautilus\n");
				ac97_data = ali_ac97_get(card, 0, AC97_POWER_CONTROL);
				ali_ac97_set(card, 0, AC97_POWER_CONTROL, 
					     ac97_data | ALI_EAPD_POWER_DOWN);
			}
		}
#endif				/* CONFIG_ALPHA_NAUTILUS || CONFIG_ALPHA_GENERIC */
		/* edited by HMSEO for GT sound */
	}
	rc = 0;
	pci_set_drvdata(pci_dev, card);

	/* Enable Address Engine Interrupts */
	trident_enable_loop_interrupts(card);

	/* Register gameport */
	trident_register_gameport(card);

out:
	return rc;

out_unregister_sound_dsp:
	unregister_sound_dsp(card->dev_audio);
out_free_irq:
	free_irq(card->irq, card);
out_proc_fs:
	pci_dev_put(card->pci_dev);
	if (res) {
		remove_proc_entry("ALi5451", NULL);
		res = NULL;
	}
	kfree(card);
	devs = NULL;
out_release_region:
	release_region(iobase, 256);
	return rc; 
}

static void __devexit
trident_remove(struct pci_dev *pci_dev)
{
	int i;
	struct trident_card *card = pci_get_drvdata(pci_dev);

	/*
	 *      Kill running timers before unload. We can't have them
	 *      going off after rmmod!
	 */
	if (card->hwvolctl)
		del_timer_sync(&card->timer);

	/* ALi S/PDIF and Power Management */
	if (card->pci_id == PCI_DEVICE_ID_ALI_5451) {
		ali_setup_spdif_out(card, ALI_PCM_TO_SPDIF_OUT);
		ali_disable_special_channel(card, ALI_SPDIF_OUT_CHANNEL);
		ali_disable_spdif_in(card);
		remove_proc_entry("ALi5451", NULL);
	}

	/* Unregister gameport */
	trident_unregister_gameport(card);

	/* Kill interrupts, and SP/DIF */
	trident_disable_loop_interrupts(card);

	/* free hardware resources */
	free_irq(card->irq, card);
	release_region(card->iobase, 256);

	/* unregister audio devices */
	for (i = 0; i < NR_AC97; i++)
		if (card->ac97_codec[i] != NULL) {
			unregister_sound_mixer(card->ac97_codec[i]->dev_mixer);
			ac97_release_codec(card->ac97_codec[i]);
		}
	unregister_sound_dsp(card->dev_audio);

	pci_set_drvdata(pci_dev, NULL);
	pci_dev_put(card->pci_dev);
	kfree(card);
}

MODULE_AUTHOR("Alan Cox, Aaron Holtzman, Ollie Lho, Ching Ling Lee, Muli Ben-Yehuda");
MODULE_DESCRIPTION("Trident 4DWave/SiS 7018/ALi 5451 and Tvia/IGST CyberPro5050 PCI "
		   "Audio Driver");
MODULE_LICENSE("GPL");

#define TRIDENT_MODULE_NAME "trident"

static struct pci_driver trident_pci_driver = {
	.name = TRIDENT_MODULE_NAME,
	.id_table = trident_pci_tbl,
	.probe = trident_probe,
	.remove = __devexit_p(trident_remove),
#ifdef CONFIG_PM
	.suspend = trident_suspend,
	.resume = trident_resume
#endif
};

static int __init
trident_init_module(void)
{
	printk(KERN_INFO "Trident 4DWave/SiS 7018/ALi 5451,Tvia CyberPro " 
	       "5050 PCI Audio, version " DRIVER_VERSION ", " __TIME__ " " 
	       __DATE__ "\n");

	return pci_register_driver(&trident_pci_driver);
}

static void __exit
trident_cleanup_module(void)
{
	pci_unregister_driver(&trident_pci_driver);
}

module_init(trident_init_module);
module_exit(trident_cleanup_module);