aboutsummaryrefslogtreecommitdiff
path: root/sound/pci/azt3328.c
blob: d24fe425e87f4500c87059c56557a962ad1e8192 (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
/*  azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
 *  Copyright (C) 2002, 2005 - 2011 by Andreas Mohr <andi AT lisas.de>
 *
 *  Framework borrowed from Bart Hartgers's als4000.c.
 *  Driver developed on PCI168 AP(W) version (PCI rev. 10, subsystem ID 1801),
 *  found in a Fujitsu-Siemens PC ("Cordant", aluminum case).
 *  Other versions are:
 *  PCI168 A(W), sub ID 1800
 *  PCI168 A/AP, sub ID 8000
 *  Please give me feedback in case you try my driver with one of these!!
 *
 *  Keywords: Windows XP Vista 168nt4-125.zip 168win95-125.zip PCI 168 download
 *  (XP/Vista do not support this card at all but every Linux distribution
 *   has very good support out of the box;
 *   just to make sure that the right people hit this and get to know that,
 *   despite the high level of Internet ignorance - as usual :-P -
 *   about very good support for this card - on Linux!)
 *
 * GPL LICENSE
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * NOTES
 *  Since Aztech does not provide any chipset documentation,
 *  even on repeated request to various addresses,
 *  and the answer that was finally given was negative
 *  (and I was stupid enough to manage to get hold of a PCI168 soundcard
 *  in the first place >:-P}),
 *  I was forced to base this driver on reverse engineering
 *  (3 weeks' worth of evenings filled with driver work).
 *  (and no, I did NOT go the easy way: to pick up a SB PCI128 for 9 Euros)
 *
 *  It is quite likely that the AZF3328 chip is the PCI cousin of the
 *  AZF3318 ("azt1020 pnp", "MM Pro 16") ISA chip, given very similar specs.
 *
 *  The AZF3328 chip (note: AZF3328, *not* AZT3328, that's just the driver name
 *  for compatibility reasons) from Azfin (joint-venture of Aztech and Fincitec,
 *  Fincitec acquired by National Semiconductor in 2002, together with the
 *  Fincitec-related company ARSmikro) has the following features:
 *
 *  - compatibility & compliance:
 *    - Microsoft PC 97 ("PC 97 Hardware Design Guide",
 *                       http://www.microsoft.com/whdc/archive/pcguides.mspx)
 *    - Microsoft PC 98 Baseline Audio
 *    - MPU401 UART
 *    - Sound Blaster Emulation (DOS Box)
 *  - builtin AC97 conformant codec (SNR over 80dB)
 *    Note that "conformant" != "compliant"!! this chip's mixer register layout
 *    *differs* from the standard AC97 layout:
 *    they chose to not implement the headphone register (which is not a
 *    problem since it's merely optional), yet when doing this, they committed
 *    the grave sin of letting other registers follow immediately instead of
 *    keeping a headphone dummy register, thereby shifting the mixer register
 *    addresses illegally. So far unfortunately it looks like the very flexible
 *    ALSA AC97 support is still not enough to easily compensate for such a
 *    grave layout violation despite all tweaks and quirks mechanisms it offers.
 *    Well, not quite: now ac97 layer is much improved (bus-specific ops!),
 *    thus I was able to implement support - it's actually working quite well.
 *    An interesting item might be Aztech AMR 2800-W, since it's an AC97
 *    modem card which might reveal the Aztech-specific codec ID which
 *    we might want to pretend, too. Dito PCI168's brother, PCI368,
 *    where the advertising datasheet says it's AC97-based and has a
 *    Digital Enhanced Game Port.
 *  - builtin genuine OPL3 - verified to work fine, 20080506
 *  - full duplex 16bit playback/record at independent sampling rate
 *  - MPU401 (+ legacy address support, claimed by one official spec sheet)
 *    FIXME: how to enable legacy addr??
 *  - game port (legacy address support)
 *  - builtin DirectInput support, helps reduce CPU overhead (interrupt-driven
 *    features supported). - See common term "Digital Enhanced Game Port"...
 *    (probably DirectInput 3.0 spec - confirm)
 *  - builtin 3D enhancement (said to be YAMAHA Ymersion)
 *  - built-in General DirectX timer having a 20 bits counter
 *    with 1us resolution (see below!)
 *  - I2S serial output port for external DAC
 *    [FIXME: 3.3V or 5V level? maximum rate is 66.2kHz right?]
 *  - supports 33MHz PCI spec 2.1, PCI power management 1.0, compliant with ACPI
 *  - supports hardware volume control
 *  - single chip low cost solution (128 pin QFP)
 *  - supports programmable Sub-vendor and Sub-system ID [24C02 SEEPROM chip]
 *    required for Microsoft's logo compliance (FIXME: where?)
 *    At least the Trident 4D Wave DX has one bit somewhere
 *    to enable writes to PCI subsystem VID registers, that should be it.
 *    This might easily be in extended PCI reg space, since PCI168 also has
 *    some custom data starting at 0x80. What kind of config settings
 *    are located in our extended PCI space anyway??
 *  - PCI168 AP(W) card: power amplifier with 4 Watts/channel at 4 Ohms
 *    [TDA1517P chip]
 *
 *  Note that this driver now is actually *better* than the Windows driver,
 *  since it additionally supports the card's 1MHz DirectX timer - just try
 *  the following snd-seq module parameters etc.:
 *  - options snd-seq seq_default_timer_class=2 seq_default_timer_sclass=0
 *    seq_default_timer_card=0 seq_client_load=1 seq_default_timer_device=0
 *    seq_default_timer_subdevice=0 seq_default_timer_resolution=1000000
 *  - "timidity -iAv -B2,8 -Os -EFreverb=0"
 *  - "pmidi -p 128:0 jazz.mid"
 *
 *  OPL3 hardware playback testing, try something like:
 *  cat /proc/asound/hwdep
 *  and
 *  aconnect -o
 *  Then use
 *  sbiload -Dhw:x,y --opl3 /usr/share/sounds/opl3/std.o3 ......./drums.o3
 *  where x,y is the xx-yy number as given in hwdep.
 *  Then try
 *  pmidi -p a:b jazz.mid
 *  where a:b is the client number plus 0 usually, as given by aconnect above.
 *  Oh, and make sure to unmute the FM mixer control (doh!)
 *  NOTE: power use during OPL3 playback is _VERY_ high (70W --> 90W!)
 *  despite no CPU activity, possibly due to hindering ACPI idling somehow.
 *  Shouldn't be a problem of the AZF3328 chip itself, I'd hope.
 *  Higher PCM / FM mixer levels seem to conflict (causes crackling),
 *  at least sometimes.   Maybe even use with hardware sequencer timer above :)
 *  adplay/adplug-utils might soon offer hardware-based OPL3 playback, too.
 *
 *  Certain PCI versions of this card are susceptible to DMA traffic underruns
 *  in some systems (resulting in sound crackling/clicking/popping),
 *  probably because they don't have a DMA FIFO buffer or so.
 *  Overview (PCI ID/PCI subID/PCI rev.):
 *  - no DMA crackling on SiS735: 0x50DC/0x1801/16
 *  - unknown performance: 0x50DC/0x1801/10
 *    (well, it's not bad on an Athlon 1800 with now very optimized IRQ handler)
 *
 *  Crackling happens with VIA chipsets or, in my case, an SiS735, which is
 *  supposed to be very fast and supposed to get rid of crackling much
 *  better than a VIA, yet ironically I still get crackling, like many other
 *  people with the same chipset.
 *  Possible remedies:
 *  - use speaker (amplifier) output instead of headphone output
 *    (in case crackling is due to overloaded output clipping)
 *  - plug card into a different PCI slot, preferably one that isn't shared
 *    too much (this helps a lot, but not completely!)
 *  - get rid of PCI VGA card, use AGP instead
 *  - upgrade or downgrade BIOS
 *  - fiddle with PCI latency settings (setpci -v -s BUSID latency_timer=XX)
 *    Not too helpful.
 *  - Disable ACPI/power management/"Auto Detect RAM/PCI Clk" in BIOS
 *
 * BUGS
 *  - full-duplex might *still* be problematic, however a recent test was fine
 *  - (non-bug) "Bass/Treble or 3D settings don't work" - they do get evaluated
 *    if you set PCM output switch to "pre 3D" instead of "post 3D".
 *    If this can't be set, then get a mixer application that Isn't Stupid (tm)
 *    (e.g. kmix, gamix) - unfortunately several are!!
 *  - locking is not entirely clean, especially the audio stream activity
 *    ints --> may be racy
 *  - an _unconnected_ secondary joystick at the gameport will be reported
 *    to be "active" (floating values, not precisely -1) due to the way we need
 *    to read the Digital Enhanced Game Port. Not sure whether it is fixable.
 *
 * TODO
 *  - use PCI_VDEVICE
 *  - verify driver status on x86_64
 *  - test multi-card driver operation
 *  - (ab)use 1MHz DirectX timer as kernel clocksource
 *  - test MPU401 MIDI playback etc.
 *  - add more power micro-management (disable various units of the card
 *    as long as they're unused, to improve audio quality and save power).
 *    However this requires more I/O ports which I haven't figured out yet
 *    and which thus might not even exist...
 *    The standard suspend/resume functionality could probably make use of
 *    some improvement, too...
 *  - figure out what all unknown port bits are responsible for
 *  - figure out some cleverly evil scheme to possibly make ALSA AC97 code
 *    fully accept our quite incompatible ""AC97"" mixer and thus save some
 *    code (but I'm not too optimistic that doing this is possible at all)
 *  - use MMIO (memory-mapped I/O)? Slightly faster access, e.g. for gameport.
 */

#include <asm/io.h>
#include <linux/init.h>
#include <linux/bug.h> /* WARN_ONCE */
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/initval.h>
/*
 * Config switch, to use ALSA's AC97 layer instead of old custom mixer crap.
 * If the AC97 compatibility parts we needed to implement locally turn out
 * to work nicely, then remove the old implementation eventually.
 */
#define AZF_USE_AC97_LAYER 1

#ifdef AZF_USE_AC97_LAYER
#include <sound/ac97_codec.h>
#endif
#include "azt3328.h"

MODULE_AUTHOR("Andreas Mohr <andi AT lisas.de>");
MODULE_DESCRIPTION("Aztech AZF3328 (PCI168)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");

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

/* === Debug settings ===
  Further diagnostic functionality than the settings below
  does not need to be provided, since one can easily write a POSIX shell script
  to dump the card's I/O ports (those listed in lspci -v -v):
  dump()
  {
    local descr=$1; local addr=$2; local count=$3

    echo "${descr}: ${count} @ ${addr}:"
    dd if=/dev/port skip=`printf %d ${addr}` count=${count} bs=1 \
      2>/dev/null| hexdump -C
  }
  and then use something like
  "dump joy200 0x200 8", "dump mpu388 0x388 4", "dump joy 0xb400 8",
  "dump codec00 0xa800 32", "dump mixer 0xb800 64", "dump synth 0xbc00 8",
  possibly within a "while true; do ... sleep 1; done" loop.
  Tweaking ports could be done using
  VALSTRING="`printf "%02x" $value`"
  printf "\x""$VALSTRING"|dd of=/dev/port seek=`printf %d ${addr}` bs=1 \
    2>/dev/null
*/

#define DEBUG_MISC	0
#define DEBUG_CALLS	0
#define DEBUG_MIXER	0
#define DEBUG_CODEC	0
#define DEBUG_TIMER	0
#define DEBUG_GAME	0
#define DEBUG_PM	0
#define MIXER_TESTING	0

#if DEBUG_MISC
#define snd_azf3328_dbgmisc(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbgmisc(format, args...)
#endif

#if DEBUG_CALLS
#define snd_azf3328_dbgcalls(format, args...) printk(format, ##args)
#define snd_azf3328_dbgcallenter() printk(KERN_DEBUG "--> %s\n", __func__)
#define snd_azf3328_dbgcallleave() printk(KERN_DEBUG "<-- %s\n", __func__)
#else
#define snd_azf3328_dbgcalls(format, args...)
#define snd_azf3328_dbgcallenter()
#define snd_azf3328_dbgcallleave()
#endif

#if DEBUG_MIXER
#define snd_azf3328_dbgmixer(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbgmixer(format, args...)
#endif

#if DEBUG_CODEC
#define snd_azf3328_dbgcodec(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbgcodec(format, args...)
#endif

#if DEBUG_MISC
#define snd_azf3328_dbgtimer(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbgtimer(format, args...)
#endif

#if DEBUG_GAME
#define snd_azf3328_dbggame(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbggame(format, args...)
#endif

#if DEBUG_PM
#define snd_azf3328_dbgpm(format, args...) printk(KERN_DEBUG format, ##args)
#else
#define snd_azf3328_dbgpm(format, args...)
#endif

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for AZF3328 soundcard.");

static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for AZF3328 soundcard.");

static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable AZF3328 soundcard.");

static int seqtimer_scaling = 128;
module_param(seqtimer_scaling, int, 0444);
MODULE_PARM_DESC(seqtimer_scaling, "Set 1024000Hz sequencer timer scale factor (lockup danger!). Default 128.");

enum snd_azf3328_codec_type {
  /* warning: fixed indices (also used for bitmask checks!) */
  AZF_CODEC_PLAYBACK = 0,
  AZF_CODEC_CAPTURE = 1,
  AZF_CODEC_I2S_OUT = 2,
};

struct snd_azf3328_codec_data {
	unsigned long io_base; /* keep first! (avoid offset calc) */
	unsigned int dma_base; /* helper to avoid an indirection in hotpath */
	spinlock_t *lock; /* TODO: convert to our own per-codec lock member */
	struct snd_pcm_substream *substream;
	bool running;
	enum snd_azf3328_codec_type type;
	const char *name;
};

struct snd_azf3328 {
	/* often-used fields towards beginning, then grouped */

	unsigned long ctrl_io; /* usually 0xb000, size 128 */
	unsigned long game_io;  /* usually 0xb400, size 8 */
	unsigned long mpu_io;   /* usually 0xb800, size 4 */
	unsigned long opl3_io; /* usually 0xbc00, size 8 */
	unsigned long mixer_io; /* usually 0xc000, size 64 */

	spinlock_t reg_lock;

	struct snd_timer *timer;

	struct snd_pcm *pcm[3];

	/* playback, recording and I2S out codecs */
	struct snd_azf3328_codec_data codecs[3];

#ifdef AZF_USE_AC97_LAYER
	struct snd_ac97 *ac97;
#endif

	struct snd_card *card;
	struct snd_rawmidi *rmidi;

#ifdef SUPPORT_GAMEPORT
	struct gameport *gameport;
	u16 axes[4];
#endif

	struct pci_dev *pci;
	int irq;

	/* register 0x6a is write-only, thus need to remember setting.
	 * If we need to add more registers here, then we might try to fold this
	 * into some transparent combined shadow register handling with
	 * CONFIG_PM register storage below, but that's slightly difficult. */
	u16 shadow_reg_ctrl_6AH;

#ifdef CONFIG_PM
	/* register value containers for power management
	 * Note: not always full I/O range preserved (similar to Win driver!) */
	u32 saved_regs_ctrl[AZF_ALIGN(AZF_IO_SIZE_CTRL_PM) / 4];
	u32 saved_regs_game[AZF_ALIGN(AZF_IO_SIZE_GAME_PM) / 4];
	u32 saved_regs_mpu[AZF_ALIGN(AZF_IO_SIZE_MPU_PM) / 4];
	u32 saved_regs_opl3[AZF_ALIGN(AZF_IO_SIZE_OPL3_PM) / 4];
	u32 saved_regs_mixer[AZF_ALIGN(AZF_IO_SIZE_MIXER_PM) / 4];
#endif
};

static DEFINE_PCI_DEVICE_TABLE(snd_azf3328_ids) = {
	{ 0x122D, 0x50DC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* PCI168/3328 */
	{ 0x122D, 0x80DA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* 3328 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_azf3328_ids);


static int
snd_azf3328_io_reg_setb(unsigned reg, u8 mask, bool do_set)
{
	/* Well, strictly spoken, the inb/outb sequence isn't atomic
	   and would need locking. However we currently don't care
	   since it potentially complicates matters. */
	u8 prev = inb(reg), new;

	new = (do_set) ? (prev|mask) : (prev & ~mask);
	/* we need to always write the new value no matter whether it differs
	 * or not, since some register bits don't indicate their setting */
	outb(new, reg);
	if (new != prev)
		return 1;

	return 0;
}

static inline void
snd_azf3328_codec_outb(const struct snd_azf3328_codec_data *codec,
		       unsigned reg,
		       u8 value
)
{
	outb(value, codec->io_base + reg);
}

static inline u8
snd_azf3328_codec_inb(const struct snd_azf3328_codec_data *codec, unsigned reg)
{
	return inb(codec->io_base + reg);
}

static inline void
snd_azf3328_codec_outw(const struct snd_azf3328_codec_data *codec,
		       unsigned reg,
		       u16 value
)
{
	outw(value, codec->io_base + reg);
}

static inline u16
snd_azf3328_codec_inw(const struct snd_azf3328_codec_data *codec, unsigned reg)
{
	return inw(codec->io_base + reg);
}

static inline void
snd_azf3328_codec_outl(const struct snd_azf3328_codec_data *codec,
		       unsigned reg,
		       u32 value
)
{
	outl(value, codec->io_base + reg);
}

static inline void
snd_azf3328_codec_outl_multi(const struct snd_azf3328_codec_data *codec,
			     unsigned reg, const void *buffer, int count
)
{
	unsigned long addr = codec->io_base + reg;
	if (count) {
		const u32 *buf = buffer;
		do {
			outl(*buf++, addr);
			addr += 4;
		} while (--count);
	}
}

static inline u32
snd_azf3328_codec_inl(const struct snd_azf3328_codec_data *codec, unsigned reg)
{
	return inl(codec->io_base + reg);
}

static inline void
snd_azf3328_ctrl_outb(const struct snd_azf3328 *chip, unsigned reg, u8 value)
{
	outb(value, chip->ctrl_io + reg);
}

static inline u8
snd_azf3328_ctrl_inb(const struct snd_azf3328 *chip, unsigned reg)
{
	return inb(chip->ctrl_io + reg);
}

static inline void
snd_azf3328_ctrl_outw(const struct snd_azf3328 *chip, unsigned reg, u16 value)
{
	outw(value, chip->ctrl_io + reg);
}

static inline void
snd_azf3328_ctrl_outl(const struct snd_azf3328 *chip, unsigned reg, u32 value)
{
	outl(value, chip->ctrl_io + reg);
}

static inline void
snd_azf3328_game_outb(const struct snd_azf3328 *chip, unsigned reg, u8 value)
{
	outb(value, chip->game_io + reg);
}

static inline void
snd_azf3328_game_outw(const struct snd_azf3328 *chip, unsigned reg, u16 value)
{
	outw(value, chip->game_io + reg);
}

static inline u8
snd_azf3328_game_inb(const struct snd_azf3328 *chip, unsigned reg)
{
	return inb(chip->game_io + reg);
}

static inline u16
snd_azf3328_game_inw(const struct snd_azf3328 *chip, unsigned reg)
{
	return inw(chip->game_io + reg);
}

static inline void
snd_azf3328_mixer_outw(const struct snd_azf3328 *chip, unsigned reg, u16 value)
{
	outw(value, chip->mixer_io + reg);
}

static inline u16
snd_azf3328_mixer_inw(const struct snd_azf3328 *chip, unsigned reg)
{
	return inw(chip->mixer_io + reg);
}

#define AZF_MUTE_BIT 0x80

static bool
snd_azf3328_mixer_mute_control(const struct snd_azf3328 *chip,
			   unsigned reg, bool do_mute
)
{
	unsigned long portbase = chip->mixer_io + reg + 1;
	bool updated;

	/* the mute bit is on the *second* (i.e. right) register of a
	 * left/right channel setting */
	updated = snd_azf3328_io_reg_setb(portbase, AZF_MUTE_BIT, do_mute);

	/* indicate whether it was muted before */
	return (do_mute) ? !updated : updated;
}

static inline bool
snd_azf3328_mixer_mute_control_master(const struct snd_azf3328 *chip,
			   bool do_mute
)
{
	return snd_azf3328_mixer_mute_control(
		chip,
		IDX_MIXER_PLAY_MASTER,
		do_mute
	);
}

static inline bool
snd_azf3328_mixer_mute_control_pcm(const struct snd_azf3328 *chip,
			   bool do_mute
)
{
	return snd_azf3328_mixer_mute_control(
		chip,
		IDX_MIXER_WAVEOUT,
		do_mute
	);
}

static inline void
snd_azf3328_mixer_reset(const struct snd_azf3328 *chip)
{
	/* reset (close) mixer:
	 * first mute master volume, then reset
	 */
	snd_azf3328_mixer_mute_control_master(chip, 1);
	snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);
}

#ifdef AZF_USE_AC97_LAYER

static inline void
snd_azf3328_mixer_ac97_map_unsupported(unsigned short reg, const char *mode)
{
	/* need to add some more or less clever emulation? */
	printk(KERN_WARNING
		"azt3328: missing %s emulation for AC97 register 0x%02x!\n",
		mode, reg);
}

/*
 * Need to have _special_ AC97 mixer hardware register index mapper,
 * to compensate for the issue of a rather AC97-incompatible hardware layout.
 */
#define AZF_REG_MASK 0x3f
#define AZF_AC97_REG_UNSUPPORTED 0x8000
#define AZF_AC97_REG_REAL_IO_READ 0x4000
#define AZF_AC97_REG_REAL_IO_WRITE 0x2000
#define AZF_AC97_REG_REAL_IO_RW \
	(AZF_AC97_REG_REAL_IO_READ | AZF_AC97_REG_REAL_IO_WRITE)
#define AZF_AC97_REG_EMU_IO_READ 0x0400
#define AZF_AC97_REG_EMU_IO_WRITE 0x0200
#define AZF_AC97_REG_EMU_IO_RW \
	(AZF_AC97_REG_EMU_IO_READ | AZF_AC97_REG_EMU_IO_WRITE)
static unsigned short
snd_azf3328_mixer_ac97_map_reg_idx(unsigned short reg)
{
	static const struct {
		unsigned short azf_reg;
	} azf_reg_mapper[] = {
		/* Especially when taking into consideration
		 * mono/stereo-based sequence of azf vs. AC97 control series,
		 * it's quite obvious that azf simply got rid
		 * of the AC97_HEADPHONE control at its intended offset,
		 * thus shifted _all_ controls by one,
		 * and _then_ simply added it as an FMSYNTH control at the end,
		 * to make up for the offset.
		 * This means we'll have to translate indices here as
		 * needed and then do some tiny AC97 patch action
		 * (snd_ac97_rename_vol_ctl() etc.) - that's it.
		 */
		{ /* AC97_RESET */ IDX_MIXER_RESET
			| AZF_AC97_REG_REAL_IO_WRITE
			| AZF_AC97_REG_EMU_IO_READ },
		{ /* AC97_MASTER */ IDX_MIXER_PLAY_MASTER },
		 /* note large shift: AC97_HEADPHONE to IDX_MIXER_FMSYNTH! */
		{ /* AC97_HEADPHONE */ IDX_MIXER_FMSYNTH },
		{ /* AC97_MASTER_MONO */ IDX_MIXER_MODEMOUT },
		{ /* AC97_MASTER_TONE */ IDX_MIXER_BASSTREBLE },
		{ /* AC97_PC_BEEP */ IDX_MIXER_PCBEEP },
		{ /* AC97_PHONE */ IDX_MIXER_MODEMIN },
		{ /* AC97_MIC */ IDX_MIXER_MIC },
		{ /* AC97_LINE */ IDX_MIXER_LINEIN },
		{ /* AC97_CD */ IDX_MIXER_CDAUDIO },
		{ /* AC97_VIDEO */ IDX_MIXER_VIDEO },
		{ /* AC97_AUX */ IDX_MIXER_AUX },
		{ /* AC97_PCM */ IDX_MIXER_WAVEOUT },
		{ /* AC97_REC_SEL */ IDX_MIXER_REC_SELECT },
		{ /* AC97_REC_GAIN */ IDX_MIXER_REC_VOLUME },
		{ /* AC97_REC_GAIN_MIC */ AZF_AC97_REG_EMU_IO_RW },
		{ /* AC97_GENERAL_PURPOSE */ IDX_MIXER_ADVCTL2 },
		{ /* AC97_3D_CONTROL */ IDX_MIXER_ADVCTL1 },
	};

	unsigned short reg_azf = AZF_AC97_REG_UNSUPPORTED;

	/* azf3328 supports the low-numbered and low-spec:ed range
	   of AC97 regs only */
	if (reg <= AC97_3D_CONTROL) {
		unsigned short reg_idx = reg / 2;
		reg_azf = azf_reg_mapper[reg_idx].azf_reg;
		/* a translation-only entry means it's real read/write: */
		if (!(reg_azf & ~AZF_REG_MASK))
			reg_azf |= AZF_AC97_REG_REAL_IO_RW;
	} else {
		switch (reg) {
		case AC97_POWERDOWN:
			reg_azf = AZF_AC97_REG_EMU_IO_RW;
			break;
		case AC97_EXTENDED_ID:
			reg_azf = AZF_AC97_REG_EMU_IO_READ;
			break;
		case AC97_EXTENDED_STATUS:
			/* I don't know what the h*ll AC97 layer
			 * would consult this _extended_ register for
			 * given a base-AC97-advertised card,
			 * but let's just emulate it anyway :-P
			 */
			reg_azf = AZF_AC97_REG_EMU_IO_RW;
			break;
		case AC97_VENDOR_ID1:
		case AC97_VENDOR_ID2:
			reg_azf = AZF_AC97_REG_EMU_IO_READ;
			break;
		}
	}
	return reg_azf;
}

static const unsigned short
azf_emulated_ac97_caps =
	AC97_BC_DEDICATED_MIC |
	AC97_BC_BASS_TREBLE |
	/* Headphone is an FM Synth control here */
	AC97_BC_HEADPHONE |
	/* no AC97_BC_LOUDNESS! */
	/* mask 0x7c00 is
	   vendor-specific 3D enhancement
	   vendor indicator.
	   Since there actually _is_ an
	   entry for Aztech Labs
	   (13), make damn sure
	   to indicate it. */
	(13 << 10);

static const unsigned short
azf_emulated_ac97_powerdown =
	/* pretend everything to be active */
		AC97_PD_ADC_STATUS |
		AC97_PD_DAC_STATUS |
		AC97_PD_MIXER_STATUS |
		AC97_PD_VREF_STATUS;

/*
 * Emulated, _inofficial_ vendor ID
 * (there might be some devices such as the MR 2800-W
 * which could reveal the real Aztech AC97 ID).
 * We choose to use "AZT" prefix, and then use 1 to indicate PCI168
 * (better don't use 0x68 since there's a PCI368 as well).
 */
static const unsigned int
azf_emulated_ac97_vendor_id = 0x415a5401;

static unsigned short
snd_azf3328_mixer_ac97_read(struct snd_ac97 *ac97, unsigned short reg_ac97)
{
	const struct snd_azf3328 *chip = ac97->private_data;
	unsigned short reg_azf = snd_azf3328_mixer_ac97_map_reg_idx(reg_ac97);
	unsigned short reg_val = 0;
	bool unsupported = 0;

	snd_azf3328_dbgmixer(
		"snd_azf3328_mixer_ac97_read reg_ac97 %u\n",
			reg_ac97
	);
	if (reg_azf & AZF_AC97_REG_UNSUPPORTED)
		unsupported = 1;
	else {
		if (reg_azf & AZF_AC97_REG_REAL_IO_READ)
			reg_val = snd_azf3328_mixer_inw(chip,
						reg_azf & AZF_REG_MASK);
		else {
			/*
			 * Proceed with dummy I/O read,
			 * to ensure compatible timing where this may matter.
			 * (ALSA AC97 layer usually doesn't call I/O functions
			 * due to intelligent I/O caching anyway)
			 * Choose a mixer register that's thoroughly unrelated
			 * to common audio (try to minimize distortion).
			 */
			snd_azf3328_mixer_inw(chip, IDX_MIXER_SOMETHING30H);
		}

		if (reg_azf & AZF_AC97_REG_EMU_IO_READ) {
			switch (reg_ac97) {
			case AC97_RESET:
				reg_val |= azf_emulated_ac97_caps;
				break;
			case AC97_POWERDOWN:
				reg_val |= azf_emulated_ac97_powerdown;
				break;
			case AC97_EXTENDED_ID:
			case AC97_EXTENDED_STATUS:
				/* AFAICS we simply can't support anything: */
				reg_val |= 0;
				break;
			case AC97_VENDOR_ID1:
				reg_val = azf_emulated_ac97_vendor_id >> 16;
				break;
			case AC97_VENDOR_ID2:
				reg_val = azf_emulated_ac97_vendor_id & 0xffff;
				break;
			default:
				unsupported = 1;
				break;
			}
		}
	}
	if (unsupported)
		snd_azf3328_mixer_ac97_map_unsupported(reg_ac97, "read");

	return reg_val;
}

static void
snd_azf3328_mixer_ac97_write(struct snd_ac97 *ac97,
		     unsigned short reg_ac97, unsigned short val)
{
	const struct snd_azf3328 *chip = ac97->private_data;
	unsigned short reg_azf = snd_azf3328_mixer_ac97_map_reg_idx(reg_ac97);
	bool unsupported = 0;

	snd_azf3328_dbgmixer(
		"snd_azf3328_mixer_ac97_write reg_ac97 %u val %u\n",
			reg_ac97, val
	);
	if (reg_azf & AZF_AC97_REG_UNSUPPORTED)
		unsupported = 1;
	else {
		if (reg_azf & AZF_AC97_REG_REAL_IO_WRITE)
			snd_azf3328_mixer_outw(
				chip,
				reg_azf & AZF_REG_MASK,
				val
			);
		else
		if (reg_azf & AZF_AC97_REG_EMU_IO_WRITE) {
			switch (reg_ac97) {
			case AC97_REC_GAIN_MIC:
			case AC97_POWERDOWN:
			case AC97_EXTENDED_STATUS:
				/*
				 * Silently swallow these writes.
				 * Since for most registers our card doesn't
				 * actually support a comparable feature,
				 * this is exactly what we should do here.
				 * The AC97 layer's I/O caching probably
				 * automatically takes care of all the rest...
				 * (remembers written values etc.)
				 */
				break;
			default:
				unsupported = 1;
				break;
			}
		}
	}
	if (unsupported)
		snd_azf3328_mixer_ac97_map_unsupported(reg_ac97, "write");
}

static int __devinit
snd_azf3328_mixer_new(struct snd_azf3328 *chip)
{
	struct snd_ac97_bus *bus;
	struct snd_ac97_template ac97;
	static struct snd_ac97_bus_ops ops = {
		.write = snd_azf3328_mixer_ac97_write,
		.read = snd_azf3328_mixer_ac97_read,
	};
	int rc;

	memset(&ac97, 0, sizeof(ac97));
	ac97.scaps = AC97_SCAP_SKIP_MODEM
			| AC97_SCAP_AUDIO /* we support audio! */
			| AC97_SCAP_NO_SPDIF;
	ac97.private_data = chip;
	ac97.pci = chip->pci;

	/*
	 * ALSA's AC97 layer has terrible init crackling issues,
	 * unfortunately, and since it makes use of AC97_RESET,
	 * there's no use trying to mute Master Playback proactively.
	 */

	rc = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus);
	if (!rc)
		rc = snd_ac97_mixer(bus, &ac97, &chip->ac97);
		/*
		 * Make sure to complain loudly in case of AC97 init failure,
		 * since failure may happen quite often,
		 * due to this card being a very quirky AC97 "lookalike".
		 */
	if (rc)
		printk(KERN_ERR "azt3328: AC97 init failed, err %d!\n", rc);

	/* If we return an error here, then snd_card_free() should
	 * free up any ac97 codecs that got created, as well as the bus.
	 */
	return rc;
}
#else /* AZF_USE_AC97_LAYER */
static void
snd_azf3328_mixer_write_volume_gradually(const struct snd_azf3328 *chip,
					 unsigned reg,
					 unsigned char dst_vol_left,
					 unsigned char dst_vol_right,
					 int chan_sel, int delay
)
{
	unsigned long portbase = chip->mixer_io + reg;
	unsigned char curr_vol_left = 0, curr_vol_right = 0;
	int left_change = 0, right_change = 0;

	snd_azf3328_dbgcallenter();

	if (chan_sel & SET_CHAN_LEFT) {
		curr_vol_left  = inb(portbase + 1);

		/* take care of muting flag contained in left channel */
		if (curr_vol_left & AZF_MUTE_BIT)
			dst_vol_left |= AZF_MUTE_BIT;
		else
			dst_vol_left &= ~AZF_MUTE_BIT;

		left_change = (curr_vol_left > dst_vol_left) ? -1 : 1;
	}

	if (chan_sel & SET_CHAN_RIGHT) {
		curr_vol_right = inb(portbase + 0);

		right_change = (curr_vol_right > dst_vol_right) ? -1 : 1;
	}

	do {
		if (left_change) {
			if (curr_vol_left != dst_vol_left) {
				curr_vol_left += left_change;
				outb(curr_vol_left, portbase + 1);
			} else
			    left_change = 0;
		}
		if (right_change) {
			if (curr_vol_right != dst_vol_right) {
				curr_vol_right += right_change;

			/* during volume change, the right channel is crackling
			 * somewhat more than the left channel, unfortunately.
			 * This seems to be a hardware issue. */
				outb(curr_vol_right, portbase + 0);
			} else
			    right_change = 0;
		}
		if (delay)
			mdelay(delay);
	} while ((left_change) || (right_change));
	snd_azf3328_dbgcallleave();
}

/*
 * general mixer element
 */
struct azf3328_mixer_reg {
	unsigned reg;
	unsigned int lchan_shift, rchan_shift;
	unsigned int mask;
	unsigned int invert: 1;
	unsigned int stereo: 1;
	unsigned int enum_c: 4;
};

#define COMPOSE_MIXER_REG(reg,lchan_shift,rchan_shift,mask,invert,stereo,enum_c) \
 ((reg) | (lchan_shift << 8) | (rchan_shift << 12) | \
  (mask << 16) | \
  (invert << 24) | \
  (stereo << 25) | \
  (enum_c << 26))

static void snd_azf3328_mixer_reg_decode(struct azf3328_mixer_reg *r, unsigned long val)
{
	r->reg = val & 0xff;
	r->lchan_shift = (val >> 8) & 0x0f;
	r->rchan_shift = (val >> 12) & 0x0f;
	r->mask = (val >> 16) & 0xff;
	r->invert = (val >> 24) & 1;
	r->stereo = (val >> 25) & 1;
	r->enum_c = (val >> 26) & 0x0f;
}

/*
 * mixer switches/volumes
 */

#define AZF3328_MIXER_SWITCH(xname, reg, shift, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, 0x1, invert, 0, 0), \
}

#define AZF3328_MIXER_VOL_STEREO(xname, reg, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, 8, 0, mask, invert, 1, 0), \
}

#define AZF3328_MIXER_VOL_MONO(xname, reg, mask, is_right_chan) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, is_right_chan ? 0 : 8, 0, mask, 1, 0, 0), \
}

#define AZF3328_MIXER_VOL_SPECIAL(xname, reg, mask, shift, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, mask, invert, 0, 0), \
}

#define AZF3328_MIXER_ENUM(xname, reg, enum_c, shift) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer_enum, \
  .get = snd_azf3328_get_mixer_enum, .put = snd_azf3328_put_mixer_enum, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, 0, 0, 0, enum_c), \
}

static int
snd_azf3328_info_mixer(struct snd_kcontrol *kcontrol,
		       struct snd_ctl_elem_info *uinfo)
{
	struct azf3328_mixer_reg reg;

	snd_azf3328_dbgcallenter();
	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
	uinfo->type = reg.mask == 1 ?
		SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = reg.stereo + 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = reg.mask;
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_get_mixer(struct snd_kcontrol *kcontrol,
		      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_azf3328 *chip = snd_kcontrol_chip(kcontrol);
	struct azf3328_mixer_reg reg;
	u16 oreg, val;

	snd_azf3328_dbgcallenter();
	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);

	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
	val = (oreg >> reg.lchan_shift) & reg.mask;
	if (reg.invert)
		val = reg.mask - val;
	ucontrol->value.integer.value[0] = val;
	if (reg.stereo) {
		val = (oreg >> reg.rchan_shift) & reg.mask;
		if (reg.invert)
			val = reg.mask - val;
		ucontrol->value.integer.value[1] = val;
	}
	snd_azf3328_dbgmixer("get: %02x is %04x -> vol %02lx|%02lx "
			     "(shift %02d|%02d, mask %02x, inv. %d, stereo %d)\n",
		reg.reg, oreg,
		ucontrol->value.integer.value[0], ucontrol->value.integer.value[1],
		reg.lchan_shift, reg.rchan_shift, reg.mask, reg.invert, reg.stereo);
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_put_mixer(struct snd_kcontrol *kcontrol,
		      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_azf3328 *chip = snd_kcontrol_chip(kcontrol);
	struct azf3328_mixer_reg reg;
	u16 oreg, nreg, val;

	snd_azf3328_dbgcallenter();
	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
	val = ucontrol->value.integer.value[0] & reg.mask;
	if (reg.invert)
		val = reg.mask - val;
	nreg = oreg & ~(reg.mask << reg.lchan_shift);
	nreg |= (val << reg.lchan_shift);
	if (reg.stereo) {
		val = ucontrol->value.integer.value[1] & reg.mask;
		if (reg.invert)
			val = reg.mask - val;
		nreg &= ~(reg.mask << reg.rchan_shift);
		nreg |= (val << reg.rchan_shift);
	}
	if (reg.mask >= 0x07) /* it's a volume control, so better take care */
		snd_azf3328_mixer_write_volume_gradually(
			chip, reg.reg, nreg >> 8, nreg & 0xff,
			/* just set both channels, doesn't matter */
			SET_CHAN_LEFT|SET_CHAN_RIGHT,
			0);
	else
        	snd_azf3328_mixer_outw(chip, reg.reg, nreg);

	snd_azf3328_dbgmixer("put: %02x to %02lx|%02lx, "
			     "oreg %04x; shift %02d|%02d -> nreg %04x; after: %04x\n",
		reg.reg, ucontrol->value.integer.value[0], ucontrol->value.integer.value[1],
		oreg, reg.lchan_shift, reg.rchan_shift,
		nreg, snd_azf3328_mixer_inw(chip, reg.reg));
	snd_azf3328_dbgcallleave();
	return (nreg != oreg);
}

static int
snd_azf3328_info_mixer_enum(struct snd_kcontrol *kcontrol,
			    struct snd_ctl_elem_info *uinfo)
{
	static const char * const texts1[] = {
		"Mic1", "Mic2"
	};
	static const char * const texts2[] = {
		"Mix", "Mic"
	};
	static const char * const texts3[] = {
		"Mic", "CD", "Video", "Aux",
		"Line", "Mix", "Mix Mono", "Phone"
        };
	static const char * const texts4[] = {
		"pre 3D", "post 3D"
        };
	struct azf3328_mixer_reg reg;
	const char * const *p = NULL;

	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
        uinfo->count = (reg.reg == IDX_MIXER_REC_SELECT) ? 2 : 1;
        uinfo->value.enumerated.items = reg.enum_c;
        if (uinfo->value.enumerated.item > reg.enum_c - 1U)
                uinfo->value.enumerated.item = reg.enum_c - 1U;
	if (reg.reg == IDX_MIXER_ADVCTL2) {
		switch(reg.lchan_shift) {
		case 8: /* modem out sel */
			p = texts1;
			break;
		case 9: /* mono sel source */
			p = texts2;
			break;
		case 15: /* PCM Out Path */
			p = texts4;
			break;
		}
	} else
	if (reg.reg == IDX_MIXER_REC_SELECT)
		p = texts3;

	strcpy(uinfo->value.enumerated.name, p[uinfo->value.enumerated.item]);
        return 0;
}

static int
snd_azf3328_get_mixer_enum(struct snd_kcontrol *kcontrol,
			   struct snd_ctl_elem_value *ucontrol)
{
        struct snd_azf3328 *chip = snd_kcontrol_chip(kcontrol);
	struct azf3328_mixer_reg reg;
        unsigned short val;

	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
	val = snd_azf3328_mixer_inw(chip, reg.reg);
	if (reg.reg == IDX_MIXER_REC_SELECT) {
        	ucontrol->value.enumerated.item[0] = (val >> 8) & (reg.enum_c - 1);
        	ucontrol->value.enumerated.item[1] = (val >> 0) & (reg.enum_c - 1);
	} else
        	ucontrol->value.enumerated.item[0] = (val >> reg.lchan_shift) & (reg.enum_c - 1);

	snd_azf3328_dbgmixer("get_enum: %02x is %04x -> %d|%d (shift %02d, enum_c %d)\n",
		reg.reg, val, ucontrol->value.enumerated.item[0], ucontrol->value.enumerated.item[1],
		reg.lchan_shift, reg.enum_c);
        return 0;
}

static int
snd_azf3328_put_mixer_enum(struct snd_kcontrol *kcontrol,
			   struct snd_ctl_elem_value *ucontrol)
{
        struct snd_azf3328 *chip = snd_kcontrol_chip(kcontrol);
	struct azf3328_mixer_reg reg;
	u16 oreg, nreg, val;

	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
	val = oreg;
	if (reg.reg == IDX_MIXER_REC_SELECT) {
        	if (ucontrol->value.enumerated.item[0] > reg.enum_c - 1U ||
            	ucontrol->value.enumerated.item[1] > reg.enum_c - 1U)
                	return -EINVAL;
        	val = (ucontrol->value.enumerated.item[0] << 8) |
        	      (ucontrol->value.enumerated.item[1] << 0);
	} else {
        	if (ucontrol->value.enumerated.item[0] > reg.enum_c - 1U)
                	return -EINVAL;
		val &= ~((reg.enum_c - 1) << reg.lchan_shift);
        	val |= (ucontrol->value.enumerated.item[0] << reg.lchan_shift);
	}
	snd_azf3328_mixer_outw(chip, reg.reg, val);
	nreg = val;

	snd_azf3328_dbgmixer("put_enum: %02x to %04x, oreg %04x\n", reg.reg, val, oreg);
	return (nreg != oreg);
}

static struct snd_kcontrol_new snd_azf3328_mixer_controls[] __devinitdata = {
	AZF3328_MIXER_SWITCH("Master Playback Switch", IDX_MIXER_PLAY_MASTER, 15, 1),
	AZF3328_MIXER_VOL_STEREO("Master Playback Volume", IDX_MIXER_PLAY_MASTER, 0x1f, 1),
	AZF3328_MIXER_SWITCH("PCM Playback Switch", IDX_MIXER_WAVEOUT, 15, 1),
	AZF3328_MIXER_VOL_STEREO("PCM Playback Volume",
					IDX_MIXER_WAVEOUT, 0x1f, 1),
	AZF3328_MIXER_SWITCH("PCM 3D Bypass Playback Switch",
					IDX_MIXER_ADVCTL2, 7, 1),
	AZF3328_MIXER_SWITCH("FM Playback Switch", IDX_MIXER_FMSYNTH, 15, 1),
	AZF3328_MIXER_VOL_STEREO("FM Playback Volume", IDX_MIXER_FMSYNTH, 0x1f, 1),
	AZF3328_MIXER_SWITCH("CD Playback Switch", IDX_MIXER_CDAUDIO, 15, 1),
	AZF3328_MIXER_VOL_STEREO("CD Playback Volume", IDX_MIXER_CDAUDIO, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Capture Switch", IDX_MIXER_REC_VOLUME, 15, 1),
	AZF3328_MIXER_VOL_STEREO("Capture Volume", IDX_MIXER_REC_VOLUME, 0x0f, 0),
	AZF3328_MIXER_ENUM("Capture Source", IDX_MIXER_REC_SELECT, 8, 0),
	AZF3328_MIXER_SWITCH("Mic Playback Switch", IDX_MIXER_MIC, 15, 1),
	AZF3328_MIXER_VOL_MONO("Mic Playback Volume", IDX_MIXER_MIC, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Mic Boost (+20dB)", IDX_MIXER_MIC, 6, 0),
	AZF3328_MIXER_SWITCH("Line Playback Switch", IDX_MIXER_LINEIN, 15, 1),
	AZF3328_MIXER_VOL_STEREO("Line Playback Volume", IDX_MIXER_LINEIN, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Beep Playback Switch", IDX_MIXER_PCBEEP, 15, 1),
	AZF3328_MIXER_VOL_SPECIAL("Beep Playback Volume", IDX_MIXER_PCBEEP, 0x0f, 1, 1),
	AZF3328_MIXER_SWITCH("Video Playback Switch", IDX_MIXER_VIDEO, 15, 1),
	AZF3328_MIXER_VOL_STEREO("Video Playback Volume", IDX_MIXER_VIDEO, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Aux Playback Switch", IDX_MIXER_AUX, 15, 1),
	AZF3328_MIXER_VOL_STEREO("Aux Playback Volume", IDX_MIXER_AUX, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Modem Playback Switch", IDX_MIXER_MODEMOUT, 15, 1),
	AZF3328_MIXER_VOL_MONO("Modem Playback Volume", IDX_MIXER_MODEMOUT, 0x1f, 1),
	AZF3328_MIXER_SWITCH("Modem Capture Switch", IDX_MIXER_MODEMIN, 15, 1),
	AZF3328_MIXER_VOL_MONO("Modem Capture Volume", IDX_MIXER_MODEMIN, 0x1f, 1),
	AZF3328_MIXER_ENUM("Mic Select", IDX_MIXER_ADVCTL2, 2, 8),
	AZF3328_MIXER_ENUM("Mono Output Select", IDX_MIXER_ADVCTL2, 2, 9),
	AZF3328_MIXER_ENUM("PCM Output Route", IDX_MIXER_ADVCTL2, 2, 15), /* PCM Out Path, place in front since it controls *both* 3D and Bass/Treble! */
	AZF3328_MIXER_VOL_SPECIAL("Tone Control - Treble", IDX_MIXER_BASSTREBLE, 0x07, 1, 0),
	AZF3328_MIXER_VOL_SPECIAL("Tone Control - Bass", IDX_MIXER_BASSTREBLE, 0x07, 9, 0),
	AZF3328_MIXER_SWITCH("3D Control - Switch", IDX_MIXER_ADVCTL2, 13, 0),
	AZF3328_MIXER_VOL_SPECIAL("3D Control - Width", IDX_MIXER_ADVCTL1, 0x07, 1, 0), /* "3D Width" */
	AZF3328_MIXER_VOL_SPECIAL("3D Control - Depth", IDX_MIXER_ADVCTL1, 0x03, 8, 0), /* "Hifi 3D" */
#if MIXER_TESTING
	AZF3328_MIXER_SWITCH("0", IDX_MIXER_ADVCTL2, 0, 0),
	AZF3328_MIXER_SWITCH("1", IDX_MIXER_ADVCTL2, 1, 0),
	AZF3328_MIXER_SWITCH("2", IDX_MIXER_ADVCTL2, 2, 0),
	AZF3328_MIXER_SWITCH("3", IDX_MIXER_ADVCTL2, 3, 0),
	AZF3328_MIXER_SWITCH("4", IDX_MIXER_ADVCTL2, 4, 0),
	AZF3328_MIXER_SWITCH("5", IDX_MIXER_ADVCTL2, 5, 0),
	AZF3328_MIXER_SWITCH("6", IDX_MIXER_ADVCTL2, 6, 0),
	AZF3328_MIXER_SWITCH("7", IDX_MIXER_ADVCTL2, 7, 0),
	AZF3328_MIXER_SWITCH("8", IDX_MIXER_ADVCTL2, 8, 0),
	AZF3328_MIXER_SWITCH("9", IDX_MIXER_ADVCTL2, 9, 0),
	AZF3328_MIXER_SWITCH("10", IDX_MIXER_ADVCTL2, 10, 0),
	AZF3328_MIXER_SWITCH("11", IDX_MIXER_ADVCTL2, 11, 0),
	AZF3328_MIXER_SWITCH("12", IDX_MIXER_ADVCTL2, 12, 0),
	AZF3328_MIXER_SWITCH("13", IDX_MIXER_ADVCTL2, 13, 0),
	AZF3328_MIXER_SWITCH("14", IDX_MIXER_ADVCTL2, 14, 0),
	AZF3328_MIXER_SWITCH("15", IDX_MIXER_ADVCTL2, 15, 0),
#endif
};

static u16 __devinitdata snd_azf3328_init_values[][2] = {
        { IDX_MIXER_PLAY_MASTER,	MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_MODEMOUT,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_BASSTREBLE,		0x0000 },
	{ IDX_MIXER_PCBEEP,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_MODEMIN,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_MIC,		MIXER_MUTE_MASK|0x001f },
	{ IDX_MIXER_LINEIN,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_CDAUDIO,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_VIDEO,		MIXER_MUTE_MASK|0x1f1f },
	{ IDX_MIXER_AUX,		MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_WAVEOUT,		MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_FMSYNTH,		MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_REC_VOLUME,		MIXER_MUTE_MASK|0x0707 },
};

static int __devinit
snd_azf3328_mixer_new(struct snd_azf3328 *chip)
{
	struct snd_card *card;
	const struct snd_kcontrol_new *sw;
	unsigned int idx;
	int err;

	snd_azf3328_dbgcallenter();
	if (snd_BUG_ON(!chip || !chip->card))
		return -EINVAL;

	card = chip->card;

	/* mixer reset */
	snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);

	/* mute and zero volume channels */
	for (idx = 0; idx < ARRAY_SIZE(snd_azf3328_init_values); ++idx) {
		snd_azf3328_mixer_outw(chip,
			snd_azf3328_init_values[idx][0],
			snd_azf3328_init_values[idx][1]);
	}

	/* add mixer controls */
	sw = snd_azf3328_mixer_controls;
	for (idx = 0; idx < ARRAY_SIZE(snd_azf3328_mixer_controls);
			++idx, ++sw) {
		if ((err = snd_ctl_add(chip->card, snd_ctl_new1(sw, chip))) < 0)
			return err;
	}
	snd_component_add(card, "AZF3328 mixer");
	strcpy(card->mixername, "AZF3328 mixer");

	snd_azf3328_dbgcallleave();
	return 0;
}
#endif /* AZF_USE_AC97_LAYER */

static int
snd_azf3328_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	int res;
	snd_azf3328_dbgcallenter();
	res = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
	snd_azf3328_dbgcallleave();
	return res;
}

static int
snd_azf3328_hw_free(struct snd_pcm_substream *substream)
{
	snd_azf3328_dbgcallenter();
	snd_pcm_lib_free_pages(substream);
	snd_azf3328_dbgcallleave();
	return 0;
}

static void
snd_azf3328_codec_setfmt(struct snd_azf3328_codec_data *codec,
			       enum azf_freq_t bitrate,
			       unsigned int format_width,
			       unsigned int channels
)
{
	unsigned long flags;
	u16 val = 0xff00;
	u8 freq = 0;

	snd_azf3328_dbgcallenter();
	switch (bitrate) {
	case AZF_FREQ_4000:  freq = SOUNDFORMAT_FREQ_SUSPECTED_4000; break;
	case AZF_FREQ_4800:  freq = SOUNDFORMAT_FREQ_SUSPECTED_4800; break;
	case AZF_FREQ_5512:
		/* the AZF3328 names it "5510" for some strange reason */
			     freq = SOUNDFORMAT_FREQ_5510; break;
	case AZF_FREQ_6620:  freq = SOUNDFORMAT_FREQ_6620; break;
	case AZF_FREQ_8000:  freq = SOUNDFORMAT_FREQ_8000; break;
	case AZF_FREQ_9600:  freq = SOUNDFORMAT_FREQ_9600; break;
	case AZF_FREQ_11025: freq = SOUNDFORMAT_FREQ_11025; break;
	case AZF_FREQ_13240: freq = SOUNDFORMAT_FREQ_SUSPECTED_13240; break;
	case AZF_FREQ_16000: freq = SOUNDFORMAT_FREQ_16000; break;
	case AZF_FREQ_22050: freq = SOUNDFORMAT_FREQ_22050; break;
	case AZF_FREQ_32000: freq = SOUNDFORMAT_FREQ_32000; break;
	default:
		snd_printk(KERN_WARNING "unknown bitrate %d, assuming 44.1kHz!\n", bitrate);
		/* fall-through */
	case AZF_FREQ_44100: freq = SOUNDFORMAT_FREQ_44100; break;
	case AZF_FREQ_48000: freq = SOUNDFORMAT_FREQ_48000; break;
	case AZF_FREQ_66200: freq = SOUNDFORMAT_FREQ_SUSPECTED_66200; break;
	}
	/* val = 0xff07; 3m27.993s (65301Hz; -> 64000Hz???) hmm, 66120, 65967, 66123 */
	/* val = 0xff09; 17m15.098s (13123,478Hz; -> 12000Hz???) hmm, 13237.2Hz? */
	/* val = 0xff0a; 47m30.599s (4764,891Hz; -> 4800Hz???) yup, 4803Hz */
	/* val = 0xff0c; 57m0.510s (4010,263Hz; -> 4000Hz???) yup, 4003Hz */
	/* val = 0xff05; 5m11.556s (... -> 44100Hz) */
	/* val = 0xff03; 10m21.529s (21872,463Hz; -> 22050Hz???) */
	/* val = 0xff0f; 20m41.883s (10937,993Hz; -> 11025Hz???) */
	/* val = 0xff0d; 41m23.135s (5523,600Hz; -> 5512Hz???) */
	/* val = 0xff0e; 28m30.777s (8017Hz; -> 8000Hz???) */

	val |= freq;

	if (channels == 2)
		val |= SOUNDFORMAT_FLAG_2CHANNELS;

	if (format_width == 16)
		val |= SOUNDFORMAT_FLAG_16BIT;

	spin_lock_irqsave(codec->lock, flags);

	/* set bitrate/format */
	snd_azf3328_codec_outw(codec, IDX_IO_CODEC_SOUNDFORMAT, val);

	/* changing the bitrate/format settings switches off the
	 * audio output with an annoying click in case of 8/16bit format change
	 * (maybe shutting down DAC/ADC?), thus immediately
	 * do some tweaking to reenable it and get rid of the clicking
	 * (FIXME: yes, it works, but what exactly am I doing here?? :)
	 * FIXME: does this have some side effects for full-duplex
	 * or other dramatic side effects? */
	/* do it for non-capture codecs only */
	if (codec->type != AZF_CODEC_CAPTURE)
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			snd_azf3328_codec_inw(codec, IDX_IO_CODEC_DMA_FLAGS) |
			DMA_RUN_SOMETHING1 |
			DMA_RUN_SOMETHING2 |
			SOMETHING_ALMOST_ALWAYS_SET |
			DMA_EPILOGUE_SOMETHING |
			DMA_SOMETHING_ELSE
		);

	spin_unlock_irqrestore(codec->lock, flags);
	snd_azf3328_dbgcallleave();
}

static inline void
snd_azf3328_codec_setfmt_lowpower(struct snd_azf3328_codec_data *codec
)
{
	/* choose lowest frequency for low power consumption.
	 * While this will cause louder noise due to rather coarse frequency,
	 * it should never matter since output should always
	 * get disabled properly when idle anyway. */
	snd_azf3328_codec_setfmt(codec, AZF_FREQ_4000, 8, 1);
}

static void
snd_azf3328_ctrl_reg_6AH_update(struct snd_azf3328 *chip,
					unsigned bitmask,
					bool enable
)
{
	bool do_mask = !enable;
	if (do_mask)
		chip->shadow_reg_ctrl_6AH |= bitmask;
	else
		chip->shadow_reg_ctrl_6AH &= ~bitmask;
	snd_azf3328_dbgcodec("6AH_update mask 0x%04x do_mask %d: val 0x%04x\n",
			bitmask, do_mask, chip->shadow_reg_ctrl_6AH);
	snd_azf3328_ctrl_outw(chip, IDX_IO_6AH, chip->shadow_reg_ctrl_6AH);
}

static inline void
snd_azf3328_ctrl_enable_codecs(struct snd_azf3328 *chip, bool enable)
{
	snd_azf3328_dbgcodec("codec_enable %d\n", enable);
	/* no idea what exactly is being done here, but I strongly assume it's
	 * PM related */
	snd_azf3328_ctrl_reg_6AH_update(
		chip, IO_6A_PAUSE_PLAYBACK_BIT8, enable
	);
}

static void
snd_azf3328_ctrl_codec_activity(struct snd_azf3328 *chip,
				enum snd_azf3328_codec_type codec_type,
				bool enable
)
{
	struct snd_azf3328_codec_data *codec = &chip->codecs[codec_type];
	bool need_change = (codec->running != enable);

	snd_azf3328_dbgcodec(
		"codec_activity: %s codec, enable %d, need_change %d\n",
				codec->name, enable, need_change
	);
	if (need_change) {
		static const struct {
			enum snd_azf3328_codec_type other1;
			enum snd_azf3328_codec_type other2;
		} peer_codecs[3] =
			{ { AZF_CODEC_CAPTURE, AZF_CODEC_I2S_OUT },
			  { AZF_CODEC_PLAYBACK, AZF_CODEC_I2S_OUT },
			  { AZF_CODEC_PLAYBACK, AZF_CODEC_CAPTURE } };
		bool call_function;

		if (enable)
			/* if enable codec, call enable_codecs func
			   to enable codec supply... */
			call_function = 1;
		else {
			/* ...otherwise call enable_codecs func
			   (which globally shuts down operation of codecs)
			   only in case the other codecs are currently
			   not active either! */
			call_function =
				((!chip->codecs[peer_codecs[codec_type].other1]
					.running)
			     &&  (!chip->codecs[peer_codecs[codec_type].other2]
					.running));
		 }
		 if (call_function)
			snd_azf3328_ctrl_enable_codecs(chip, enable);

		/* ...and adjust clock, too
		 * (reduce noise and power consumption) */
		if (!enable)
			snd_azf3328_codec_setfmt_lowpower(codec);
		codec->running = enable;
	}
}

static void
snd_azf3328_codec_setdmaa(struct snd_azf3328_codec_data *codec,
				unsigned long addr,
				unsigned int period_bytes,
				unsigned int buffer_bytes
)
{
	snd_azf3328_dbgcallenter();
	WARN_ONCE(period_bytes & 1, "odd period length!?\n");
	WARN_ONCE(buffer_bytes != 2 * period_bytes,
		 "missed our input expectations! %u vs. %u\n",
		 buffer_bytes, period_bytes);
	if (!codec->running) {
		/* AZF3328 uses a two buffer pointer DMA transfer approach */

		unsigned long flags;

		/* width 32bit (prevent overflow): */
		u32 area_length;
		struct codec_setup_io {
			u32 dma_start_1;
			u32 dma_start_2;
			u32 dma_lengths;
		} __attribute__((packed)) setup_io;

		area_length = buffer_bytes/2;

		setup_io.dma_start_1 = addr;
		setup_io.dma_start_2 = addr+area_length;

		snd_azf3328_dbgcodec(
			"setdma: buffers %08x[%u] / %08x[%u], %u, %u\n",
				setup_io.dma_start_1, area_length,
				setup_io.dma_start_2, area_length,
				period_bytes, buffer_bytes);

		/* Hmm, are we really supposed to decrement this by 1??
		   Most definitely certainly not: configuring full length does
		   work properly (i.e. likely better), and BTW we
		   violated possibly differing frame sizes with this...

		area_length--; |* max. index *|
		*/

		/* build combined I/O buffer length word */
		setup_io.dma_lengths = (area_length << 16) | (area_length);

		spin_lock_irqsave(codec->lock, flags);
		snd_azf3328_codec_outl_multi(
			codec, IDX_IO_CODEC_DMA_START_1, &setup_io, 3
		);
		spin_unlock_irqrestore(codec->lock, flags);
	}
	snd_azf3328_dbgcallleave();
}

static int
snd_azf3328_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_azf3328_codec_data *codec = runtime->private_data;
#if 0
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);
#endif

	snd_azf3328_dbgcallenter();

	codec->dma_base = runtime->dma_addr;

#if 0
	snd_azf3328_codec_setfmt(codec,
		runtime->rate,
		snd_pcm_format_width(runtime->format),
		runtime->channels);
	snd_azf3328_codec_setdmaa(codec,
					runtime->dma_addr, count, size);
#endif
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_azf3328_codec_data *codec = runtime->private_data;
	int result = 0;
	u16 flags1;
	bool previously_muted = 0;
	bool is_main_mixer_playback_codec = (AZF_CODEC_PLAYBACK == codec->type);

	snd_azf3328_dbgcalls("snd_azf3328_pcm_trigger cmd %d\n", cmd);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_azf3328_dbgcodec("START %s\n", codec->name);

		if (is_main_mixer_playback_codec) {
			/* mute WaveOut (avoid clicking during setup) */
			previously_muted =
				snd_azf3328_mixer_mute_control_pcm(
						chip, 1
				);
		}

		snd_azf3328_codec_setfmt(codec,
			runtime->rate,
			snd_pcm_format_width(runtime->format),
			runtime->channels);

		spin_lock(codec->lock);
		/* first, remember current value: */
		flags1 = snd_azf3328_codec_inw(codec, IDX_IO_CODEC_DMA_FLAGS);

		/* stop transfer */
		flags1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);

		/* FIXME: clear interrupts or what??? */
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_IRQTYPE, 0xffff);
		spin_unlock(codec->lock);

		snd_azf3328_codec_setdmaa(codec, runtime->dma_addr,
			snd_pcm_lib_period_bytes(substream),
			snd_pcm_lib_buffer_bytes(substream)
		);

		spin_lock(codec->lock);
#ifdef WIN9X
		/* FIXME: enable playback/recording??? */
		flags1 |= DMA_RUN_SOMETHING1 | DMA_RUN_SOMETHING2;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);

		/* start transfer again */
		/* FIXME: what is this value (0x0010)??? */
		flags1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);
#else /* NT4 */
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			0x0000);
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			DMA_RUN_SOMETHING1);
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			DMA_RUN_SOMETHING1 |
			DMA_RUN_SOMETHING2);
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			DMA_RESUME |
			SOMETHING_ALMOST_ALWAYS_SET |
			DMA_EPILOGUE_SOMETHING |
			DMA_SOMETHING_ELSE);
#endif
		spin_unlock(codec->lock);
		snd_azf3328_ctrl_codec_activity(chip, codec->type, 1);

		if (is_main_mixer_playback_codec) {
			/* now unmute WaveOut */
			if (!previously_muted)
				snd_azf3328_mixer_mute_control_pcm(
						chip, 0
				);
		}

		snd_azf3328_dbgcodec("STARTED %s\n", codec->name);
		break;
	case SNDRV_PCM_TRIGGER_RESUME:
		snd_azf3328_dbgcodec("RESUME %s\n", codec->name);
		/* resume codec if we were active */
		spin_lock(codec->lock);
		if (codec->running)
			snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
				snd_azf3328_codec_inw(
					codec, IDX_IO_CODEC_DMA_FLAGS
				) | DMA_RESUME
			);
		spin_unlock(codec->lock);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		snd_azf3328_dbgcodec("STOP %s\n", codec->name);

		if (is_main_mixer_playback_codec) {
			/* mute WaveOut (avoid clicking during setup) */
			previously_muted =
				snd_azf3328_mixer_mute_control_pcm(
						chip, 1
				);
		}

		spin_lock(codec->lock);
		/* first, remember current value: */
		flags1 = snd_azf3328_codec_inw(codec, IDX_IO_CODEC_DMA_FLAGS);

		/* stop transfer */
		flags1 &= ~DMA_RESUME;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);

		/* hmm, is this really required? we're resetting the same bit
		 * immediately thereafter... */
		flags1 |= DMA_RUN_SOMETHING1;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);

		flags1 &= ~DMA_RUN_SOMETHING1;
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS, flags1);
		spin_unlock(codec->lock);
		snd_azf3328_ctrl_codec_activity(chip, codec->type, 0);

		if (is_main_mixer_playback_codec) {
			/* now unmute WaveOut */
			if (!previously_muted)
				snd_azf3328_mixer_mute_control_pcm(
						chip, 0
				);
		}

		snd_azf3328_dbgcodec("STOPPED %s\n", codec->name);
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		snd_azf3328_dbgcodec("SUSPEND %s\n", codec->name);
		/* make sure codec is stopped */
		snd_azf3328_codec_outw(codec, IDX_IO_CODEC_DMA_FLAGS,
			snd_azf3328_codec_inw(
				codec, IDX_IO_CODEC_DMA_FLAGS
			) & ~DMA_RESUME
		);
		break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_RELEASE NIY!\n");
                break;
        default:
		snd_printk(KERN_ERR "FIXME: unknown trigger mode!\n");
                return -EINVAL;
	}

	snd_azf3328_dbgcallleave();
	return result;
}

static snd_pcm_uframes_t
snd_azf3328_pcm_pointer(struct snd_pcm_substream *substream
)
{
	const struct snd_azf3328_codec_data *codec =
		substream->runtime->private_data;
	unsigned long result;
	snd_pcm_uframes_t frmres;

	result = snd_azf3328_codec_inl(codec, IDX_IO_CODEC_DMA_CURRPOS);

	/* calculate offset */
#ifdef QUERY_HARDWARE
	result -= snd_azf3328_codec_inl(codec, IDX_IO_CODEC_DMA_START_1);
#else
	result -= codec->dma_base;
#endif
	frmres = bytes_to_frames( substream->runtime, result);
	snd_azf3328_dbgcodec("%08li %s @ 0x%8lx, frames %8ld\n",
				jiffies, codec->name, result, frmres);
	return frmres;
}

/******************************************************************/

#ifdef SUPPORT_GAMEPORT
static inline void
snd_azf3328_gameport_irq_enable(struct snd_azf3328 *chip,
				bool enable
)
{
	snd_azf3328_io_reg_setb(
		chip->game_io+IDX_GAME_HWCONFIG,
		GAME_HWCFG_IRQ_ENABLE,
		enable
	);
}

static inline void
snd_azf3328_gameport_legacy_address_enable(struct snd_azf3328 *chip,
					   bool enable
)
{
	snd_azf3328_io_reg_setb(
		chip->game_io+IDX_GAME_HWCONFIG,
		GAME_HWCFG_LEGACY_ADDRESS_ENABLE,
		enable
	);
}

static void
snd_azf3328_gameport_set_counter_frequency(struct snd_azf3328 *chip,
					   unsigned int freq_cfg
)
{
	snd_azf3328_io_reg_setb(
		chip->game_io+IDX_GAME_HWCONFIG,
		0x02,
		(freq_cfg & 1) != 0
	);
	snd_azf3328_io_reg_setb(
		chip->game_io+IDX_GAME_HWCONFIG,
		0x04,
		(freq_cfg & 2) != 0
	);
}

static inline void
snd_azf3328_gameport_axis_circuit_enable(struct snd_azf3328 *chip, bool enable)
{
	snd_azf3328_ctrl_reg_6AH_update(
		chip, IO_6A_SOMETHING2_GAMEPORT, enable
	);
}

static inline void
snd_azf3328_gameport_interrupt(struct snd_azf3328 *chip)
{
	/*
	 * skeleton handler only
	 * (we do not want axis reading in interrupt handler - too much load!)
	 */
	snd_azf3328_dbggame("gameport irq\n");

	 /* this should ACK the gameport IRQ properly, hopefully. */
	snd_azf3328_game_inw(chip, IDX_GAME_AXIS_VALUE);
}

static int
snd_azf3328_gameport_open(struct gameport *gameport, int mode)
{
	struct snd_azf3328 *chip = gameport_get_port_data(gameport);
	int res;

	snd_azf3328_dbggame("gameport_open, mode %d\n", mode);
	switch (mode) {
	case GAMEPORT_MODE_COOKED:
	case GAMEPORT_MODE_RAW:
		res = 0;
		break;
	default:
		res = -1;
		break;
	}

	snd_azf3328_gameport_set_counter_frequency(chip,
				GAME_HWCFG_ADC_COUNTER_FREQ_STD);
	snd_azf3328_gameport_axis_circuit_enable(chip, (res == 0));

	return res;
}

static void
snd_azf3328_gameport_close(struct gameport *gameport)
{
	struct snd_azf3328 *chip = gameport_get_port_data(gameport);

	snd_azf3328_dbggame("gameport_close\n");
	snd_azf3328_gameport_set_counter_frequency(chip,
				GAME_HWCFG_ADC_COUNTER_FREQ_1_200);
	snd_azf3328_gameport_axis_circuit_enable(chip, 0);
}

static int
snd_azf3328_gameport_cooked_read(struct gameport *gameport,
				 int *axes,
				 int *buttons
)
{
	struct snd_azf3328 *chip = gameport_get_port_data(gameport);
	int i;
	u8 val;
	unsigned long flags;

	if (snd_BUG_ON(!chip))
		return 0;

	spin_lock_irqsave(&chip->reg_lock, flags);
	val = snd_azf3328_game_inb(chip, IDX_GAME_LEGACY_COMPATIBLE);
	*buttons = (~(val) >> 4) & 0xf;

	/* ok, this one is a bit dirty: cooked_read is being polled by a timer,
	 * thus we're atomic and cannot actively wait in here
	 * (which would be useful for us since it probably would be better
	 * to trigger a measurement in here, then wait a short amount of
	 * time until it's finished, then read values of _this_ measurement).
	 *
	 * Thus we simply resort to reading values if they're available already
	 * and trigger the next measurement.
	 */

	val = snd_azf3328_game_inb(chip, IDX_GAME_AXES_CONFIG);
	if (val & GAME_AXES_SAMPLING_READY) {
		for (i = 0; i < ARRAY_SIZE(chip->axes); ++i) {
			/* configure the axis to read */
			val = (i << 4) | 0x0f;
			snd_azf3328_game_outb(chip, IDX_GAME_AXES_CONFIG, val);

			chip->axes[i] = snd_azf3328_game_inw(
						chip, IDX_GAME_AXIS_VALUE
					);
		}
	}

	/* trigger next sampling of axes, to be evaluated the next time we
	 * enter this function */

	/* for some very, very strange reason we cannot enable
	 * Measurement Ready monitoring for all axes here,
	 * at least not when only one joystick connected */
	val = 0x03; /* we're able to monitor axes 1 and 2 only */
	snd_azf3328_game_outb(chip, IDX_GAME_AXES_CONFIG, val);

	snd_azf3328_game_outw(chip, IDX_GAME_AXIS_VALUE, 0xffff);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	for (i = 0; i < ARRAY_SIZE(chip->axes); i++) {
		axes[i] = chip->axes[i];
		if (axes[i] == 0xffff)
			axes[i] = -1;
	}

	snd_azf3328_dbggame("cooked_read: axes %d %d %d %d buttons %d\n",
		axes[0], axes[1], axes[2], axes[3], *buttons
	);

	return 0;
}

static int __devinit
snd_azf3328_gameport(struct snd_azf3328 *chip, int dev)
{
	struct gameport *gp;

	chip->gameport = gp = gameport_allocate_port();
	if (!gp) {
		printk(KERN_ERR "azt3328: cannot alloc memory for gameport\n");
		return -ENOMEM;
	}

	gameport_set_name(gp, "AZF3328 Gameport");
	gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
	gameport_set_dev_parent(gp, &chip->pci->dev);
	gp->io = chip->game_io;
	gameport_set_port_data(gp, chip);

	gp->open = snd_azf3328_gameport_open;
	gp->close = snd_azf3328_gameport_close;
	gp->fuzz = 16; /* seems ok */
	gp->cooked_read = snd_azf3328_gameport_cooked_read;

	/* DISABLE legacy address: we don't need it! */
	snd_azf3328_gameport_legacy_address_enable(chip, 0);

	snd_azf3328_gameport_set_counter_frequency(chip,
				GAME_HWCFG_ADC_COUNTER_FREQ_1_200);
	snd_azf3328_gameport_axis_circuit_enable(chip, 0);

	gameport_register_port(chip->gameport);

	return 0;
}

static void
snd_azf3328_gameport_free(struct snd_azf3328 *chip)
{
	if (chip->gameport) {
		gameport_unregister_port(chip->gameport);
		chip->gameport = NULL;
	}
	snd_azf3328_gameport_irq_enable(chip, 0);
}
#else
static inline int
snd_azf3328_gameport(struct snd_azf3328 *chip, int dev) { return -ENOSYS; }
static inline void
snd_azf3328_gameport_free(struct snd_azf3328 *chip) { }
static inline void
snd_azf3328_gameport_interrupt(struct snd_azf3328 *chip)
{
	printk(KERN_WARNING "huh, game port IRQ occurred!?\n");
}
#endif /* SUPPORT_GAMEPORT */

/******************************************************************/

static inline void
snd_azf3328_irq_log_unknown_type(u8 which)
{
	snd_azf3328_dbgcodec(
	"azt3328: unknown IRQ type (%x) occurred, please report!\n",
		which
	);
}

static inline void
snd_azf3328_pcm_interrupt(const struct snd_azf3328_codec_data *first_codec,
			  u8 status
)
{
	u8 which;
	enum snd_azf3328_codec_type codec_type;
	const struct snd_azf3328_codec_data *codec = first_codec;

	for (codec_type = AZF_CODEC_PLAYBACK;
		 codec_type <= AZF_CODEC_I2S_OUT;
			 ++codec_type, ++codec) {

		/* skip codec if there's no interrupt for it */
		if (!(status & (1 << codec_type)))
			continue;

		spin_lock(codec->lock);
		which = snd_azf3328_codec_inb(codec, IDX_IO_CODEC_IRQTYPE);
		/* ack all IRQ types immediately */
		snd_azf3328_codec_outb(codec, IDX_IO_CODEC_IRQTYPE, which);
		spin_unlock(codec->lock);

		if (codec->substream) {
			snd_pcm_period_elapsed(codec->substream);
			snd_azf3328_dbgcodec("%s period done (#%x), @ %x\n",
				codec->name,
				which,
				snd_azf3328_codec_inl(
					codec, IDX_IO_CODEC_DMA_CURRPOS
				)
			);
		} else
			printk(KERN_WARNING "azt3328: irq handler problem!\n");
		if (which & IRQ_SOMETHING)
			snd_azf3328_irq_log_unknown_type(which);
	}
}

static irqreturn_t
snd_azf3328_interrupt(int irq, void *dev_id)
{
	struct snd_azf3328 *chip = dev_id;
	u8 status;
#if DEBUG_CODEC
	static unsigned long irq_count;
#endif

	status = snd_azf3328_ctrl_inb(chip, IDX_IO_IRQSTATUS);

        /* fast path out, to ease interrupt sharing */
	if (!(status &
		(IRQ_PLAYBACK|IRQ_RECORDING|IRQ_I2S_OUT
		|IRQ_GAMEPORT|IRQ_MPU401|IRQ_TIMER)
	))
		return IRQ_NONE; /* must be interrupt for another device */

	snd_azf3328_dbgcodec(
		"irq_count %ld! IDX_IO_IRQSTATUS %04x\n",
			irq_count++ /* debug-only */,
			status
	);

	if (status & IRQ_TIMER) {
		/* snd_azf3328_dbgcodec("timer %ld\n",
			snd_azf3328_codec_inl(chip, IDX_IO_TIMER_VALUE)
				& TIMER_VALUE_MASK
		); */
		if (chip->timer)
			snd_timer_interrupt(chip->timer, chip->timer->sticks);
		/* ACK timer */
                spin_lock(&chip->reg_lock);
		snd_azf3328_ctrl_outb(chip, IDX_IO_TIMER_VALUE + 3, 0x07);
		spin_unlock(&chip->reg_lock);
		snd_azf3328_dbgcodec("azt3328: timer IRQ\n");
	}

	if (status & (IRQ_PLAYBACK|IRQ_RECORDING|IRQ_I2S_OUT))
		snd_azf3328_pcm_interrupt(chip->codecs, status);

	if (status & IRQ_GAMEPORT)
		snd_azf3328_gameport_interrupt(chip);

	/* MPU401 has less critical IRQ requirements
	 * than timer and playback/recording, right? */
	if (status & IRQ_MPU401) {
		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);

		/* hmm, do we have to ack the IRQ here somehow?
		 * If so, then I don't know how yet... */
		snd_azf3328_dbgcodec("azt3328: MPU401 IRQ\n");
	}
	return IRQ_HANDLED;
}

/*****************************************************************/

/* as long as we think we have identical snd_pcm_hardware parameters
   for playback, capture and i2s out, we can use the same physical struct
   since the struct is simply being copied into a member.
*/
static const struct snd_pcm_hardware snd_azf3328_hardware =
{
	/* FIXME!! Correct? */
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_MMAP_VALID,
	.formats =		SNDRV_PCM_FMTBIT_S8 |
				SNDRV_PCM_FMTBIT_U8 |
				SNDRV_PCM_FMTBIT_S16_LE |
				SNDRV_PCM_FMTBIT_U16_LE,
	.rates =		SNDRV_PCM_RATE_5512 |
				SNDRV_PCM_RATE_8000_48000 |
				SNDRV_PCM_RATE_KNOT,
	.rate_min =		AZF_FREQ_4000,
	.rate_max =		AZF_FREQ_66200,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(64*1024),
	.period_bytes_min =	1024,
	.period_bytes_max =	(32*1024),
	/* We simply have two DMA areas (instead of a list of descriptors
	   such as other cards); I believe that this is a fixed hardware
	   attribute and there isn't much driver magic to be done to expand it.
	   Thus indicate that we have at least and at most 2 periods. */
	.periods_min =		2,
	.periods_max =		2,
	/* FIXME: maybe that card actually has a FIFO?
	 * Hmm, it seems newer revisions do have one, but we still don't know
	 * its size... */
	.fifo_size =		0,
};


static unsigned int snd_azf3328_fixed_rates[] = {
	AZF_FREQ_4000,
	AZF_FREQ_4800,
	AZF_FREQ_5512,
	AZF_FREQ_6620,
	AZF_FREQ_8000,
	AZF_FREQ_9600,
	AZF_FREQ_11025,
	AZF_FREQ_13240,
	AZF_FREQ_16000,
	AZF_FREQ_22050,
	AZF_FREQ_32000,
	AZF_FREQ_44100,
	AZF_FREQ_48000,
	AZF_FREQ_66200
};

static struct snd_pcm_hw_constraint_list snd_azf3328_hw_constraints_rates = {
	.count = ARRAY_SIZE(snd_azf3328_fixed_rates),
	.list = snd_azf3328_fixed_rates,
	.mask = 0,
};

/*****************************************************************/

static int
snd_azf3328_pcm_open(struct snd_pcm_substream *substream,
		     enum snd_azf3328_codec_type codec_type
)
{
	struct snd_azf3328 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_azf3328_codec_data *codec = &chip->codecs[codec_type];

	snd_azf3328_dbgcallenter();
	codec->substream = substream;

	/* same parameters for all our codecs - at least we think so... */
	runtime->hw = snd_azf3328_hardware;

	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				   &snd_azf3328_hw_constraints_rates);
	runtime->private_data = codec;
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_pcm_playback_open(struct snd_pcm_substream *substream)
{
	return snd_azf3328_pcm_open(substream, AZF_CODEC_PLAYBACK);
}

static int
snd_azf3328_pcm_capture_open(struct snd_pcm_substream *substream)
{
	return snd_azf3328_pcm_open(substream, AZF_CODEC_CAPTURE);
}

static int
snd_azf3328_pcm_i2s_out_open(struct snd_pcm_substream *substream)
{
	return snd_azf3328_pcm_open(substream, AZF_CODEC_I2S_OUT);
}

static int
snd_azf3328_pcm_close(struct snd_pcm_substream *substream
)
{
	struct snd_azf3328_codec_data *codec =
		substream->runtime->private_data;

	snd_azf3328_dbgcallenter();
	codec->substream = NULL;
	snd_azf3328_dbgcallleave();
	return 0;
}

/******************************************************************/

static struct snd_pcm_ops snd_azf3328_playback_ops = {
	.open =		snd_azf3328_pcm_playback_open,
	.close =	snd_azf3328_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_azf3328_hw_params,
	.hw_free =	snd_azf3328_hw_free,
	.prepare =	snd_azf3328_pcm_prepare,
	.trigger =	snd_azf3328_pcm_trigger,
	.pointer =	snd_azf3328_pcm_pointer
};

static struct snd_pcm_ops snd_azf3328_capture_ops = {
	.open =		snd_azf3328_pcm_capture_open,
	.close =	snd_azf3328_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_azf3328_hw_params,
	.hw_free =	snd_azf3328_hw_free,
	.prepare =	snd_azf3328_pcm_prepare,
	.trigger =	snd_azf3328_pcm_trigger,
	.pointer =	snd_azf3328_pcm_pointer
};

static struct snd_pcm_ops snd_azf3328_i2s_out_ops = {
	.open =		snd_azf3328_pcm_i2s_out_open,
	.close =	snd_azf3328_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_azf3328_hw_params,
	.hw_free =	snd_azf3328_hw_free,
	.prepare =	snd_azf3328_pcm_prepare,
	.trigger =	snd_azf3328_pcm_trigger,
	.pointer =	snd_azf3328_pcm_pointer
};

static int __devinit
snd_azf3328_pcm(struct snd_azf3328 *chip)
{
enum { AZF_PCMDEV_STD, AZF_PCMDEV_I2S_OUT, NUM_AZF_PCMDEVS }; /* pcm devices */

	struct snd_pcm *pcm;
	int err;

	snd_azf3328_dbgcallenter();

	err = snd_pcm_new(chip->card, "AZF3328 DSP", AZF_PCMDEV_STD,
								1, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
						&snd_azf3328_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
						&snd_azf3328_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, chip->card->shortname);
	/* same pcm object for playback/capture (see snd_pcm_new() above) */
	chip->pcm[AZF_CODEC_PLAYBACK] = pcm;
	chip->pcm[AZF_CODEC_CAPTURE] = pcm;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
						snd_dma_pci_data(chip->pci),
							64*1024, 64*1024);

	err = snd_pcm_new(chip->card, "AZF3328 I2S OUT", AZF_PCMDEV_I2S_OUT,
								1, 0, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
						&snd_azf3328_i2s_out_ops);

	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcm[AZF_CODEC_I2S_OUT] = pcm;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
						snd_dma_pci_data(chip->pci),
							64*1024, 64*1024);

	snd_azf3328_dbgcallleave();
	return 0;
}

/******************************************************************/

/*** NOTE: the physical timer resolution actually is 1024000 ticks per second
 *** (probably derived from main crystal via a divider of 24),
 *** but announcing those attributes to user-space would make programs
 *** configure the timer to a 1 tick value, resulting in an absolutely fatal
 *** timer IRQ storm.
 *** Thus I chose to announce a down-scaled virtual timer to the outside and
 *** calculate real timer countdown values internally.
 *** (the scale factor can be set via module parameter "seqtimer_scaling").
 ***/

static int
snd_azf3328_timer_start(struct snd_timer *timer)
{
	struct snd_azf3328 *chip;
	unsigned long flags;
	unsigned int delay;

	snd_azf3328_dbgcallenter();
	chip = snd_timer_chip(timer);
	delay = ((timer->sticks * seqtimer_scaling) - 1) & TIMER_VALUE_MASK;
	if (delay < 49) {
		/* uhoh, that's not good, since user-space won't know about
		 * this timing tweak
		 * (we need to do it to avoid a lockup, though) */

		snd_azf3328_dbgtimer("delay was too low (%d)!\n", delay);
		delay = 49; /* minimum time is 49 ticks */
	}
	snd_azf3328_dbgtimer("setting timer countdown value %d\n", delay);
	delay |= TIMER_COUNTDOWN_ENABLE | TIMER_IRQ_ENABLE;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_azf3328_ctrl_outl(chip, IDX_IO_TIMER_VALUE, delay);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_azf3328_dbgcallleave();
	return 0;
}

static int
snd_azf3328_timer_stop(struct snd_timer *timer)
{
	struct snd_azf3328 *chip;
	unsigned long flags;

	snd_azf3328_dbgcallenter();
	chip = snd_timer_chip(timer);
	spin_lock_irqsave(&chip->reg_lock, flags);
	/* disable timer countdown and interrupt */
	/* Hmm, should we write TIMER_IRQ_ACK here?
	   YES indeed, otherwise a rogue timer operation - which prompts
	   ALSA(?) to call repeated stop() in vain, but NOT start() -
	   will never end (value 0x03 is kept shown in control byte).
	   Simply manually poking 0x04 _once_ immediately successfully stops
	   the hardware/ALSA interrupt activity. */
	snd_azf3328_ctrl_outb(chip, IDX_IO_TIMER_VALUE + 3, 0x04);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_azf3328_dbgcallleave();
	return 0;
}


static int
snd_azf3328_timer_precise_resolution(struct snd_timer *timer,
					       unsigned long *num, unsigned long *den)
{
	snd_azf3328_dbgcallenter();
	*num = 1;
	*den = 1024000 / seqtimer_scaling;
	snd_azf3328_dbgcallleave();
	return 0;
}

static struct snd_timer_hardware snd_azf3328_timer_hw = {
	.flags = SNDRV_TIMER_HW_AUTO,
	.resolution = 977, /* 1000000/1024000 = 0.9765625us */
	.ticks = 1024000, /* max tick count, defined by the value register; actually it's not 1024000, but 1048576, but we don't care */
	.start = snd_azf3328_timer_start,
	.stop = snd_azf3328_timer_stop,
	.precise_resolution = snd_azf3328_timer_precise_resolution,
};

static int __devinit
snd_azf3328_timer(struct snd_azf3328 *chip, int device)
{
	struct snd_timer *timer = NULL;
	struct snd_timer_id tid;
	int err;

	snd_azf3328_dbgcallenter();
	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
	tid.card = chip->card->number;
	tid.device = device;
	tid.subdevice = 0;

	snd_azf3328_timer_hw.resolution *= seqtimer_scaling;
	snd_azf3328_timer_hw.ticks /= seqtimer_scaling;

	err = snd_timer_new(chip->card, "AZF3328", &tid, &timer);
	if (err < 0)
		goto out;

	strcpy(timer->name, "AZF3328 timer");
	timer->private_data = chip;
	timer->hw = snd_azf3328_timer_hw;

	chip->timer = timer;

	snd_azf3328_timer_stop(timer);

	err = 0;

out:
	snd_azf3328_dbgcallleave();
	return err;
}

/******************************************************************/

static int
snd_azf3328_free(struct snd_azf3328 *chip)
{
	if (chip->irq < 0)
		goto __end_hw;

	snd_azf3328_mixer_reset(chip);

	snd_azf3328_timer_stop(chip->timer);
	snd_azf3328_gameport_free(chip);

	if (chip->irq >= 0)
		synchronize_irq(chip->irq);
__end_hw:
	if (chip->irq >= 0)
		free_irq(chip->irq, chip);
	pci_release_regions(chip->pci);
	pci_disable_device(chip->pci);

	kfree(chip);
	return 0;
}

static int
snd_azf3328_dev_free(struct snd_device *device)
{
	struct snd_azf3328 *chip = device->device_data;
	return snd_azf3328_free(chip);
}

#if 0
/* check whether a bit can be modified */
static void
snd_azf3328_test_bit(unsigned unsigned reg, int bit)
{
	unsigned char val, valoff, valon;

	val = inb(reg);

	outb(val & ~(1 << bit), reg);
	valoff = inb(reg);

	outb(val|(1 << bit), reg);
	valon = inb(reg);

	outb(val, reg);

	printk(KERN_DEBUG "reg %04x bit %d: %02x %02x %02x\n",
				reg, bit, val, valoff, valon
	);
}
#endif

static inline void
snd_azf3328_debug_show_ports(const struct snd_azf3328 *chip)
{
#if DEBUG_MISC
	u16 tmp;

	snd_azf3328_dbgmisc(
		"ctrl_io 0x%lx, game_io 0x%lx, mpu_io 0x%lx, "
		"opl3_io 0x%lx, mixer_io 0x%lx, irq %d\n",
		chip->ctrl_io, chip->game_io, chip->mpu_io,
		chip->opl3_io, chip->mixer_io, chip->irq
	);

	snd_azf3328_dbgmisc("game %02x %02x %02x %02x %02x %02x\n",
		snd_azf3328_game_inb(chip, 0),
		snd_azf3328_game_inb(chip, 1),
		snd_azf3328_game_inb(chip, 2),
		snd_azf3328_game_inb(chip, 3),
		snd_azf3328_game_inb(chip, 4),
		snd_azf3328_game_inb(chip, 5)
	);

	for (tmp = 0; tmp < 0x07; tmp += 1)
		snd_azf3328_dbgmisc("mpu_io 0x%04x\n", inb(chip->mpu_io + tmp));

	for (tmp = 0; tmp <= 0x07; tmp += 1)
		snd_azf3328_dbgmisc("0x%02x: game200 0x%04x, game208 0x%04x\n",
			tmp, inb(0x200 + tmp), inb(0x208 + tmp));

	for (tmp = 0; tmp <= 0x01; tmp += 1)
		snd_azf3328_dbgmisc(
			"0x%02x: mpu300 0x%04x, mpu310 0x%04x, mpu320 0x%04x, "
			"mpu330 0x%04x opl388 0x%04x opl38c 0x%04x\n",
				tmp,
				inb(0x300 + tmp),
				inb(0x310 + tmp),
				inb(0x320 + tmp),
				inb(0x330 + tmp),
				inb(0x388 + tmp),
				inb(0x38c + tmp)
		);

	for (tmp = 0; tmp < AZF_IO_SIZE_CTRL; tmp += 2)
		snd_azf3328_dbgmisc("ctrl 0x%02x: 0x%04x\n",
			tmp, snd_azf3328_ctrl_inw(chip, tmp)
		);

	for (tmp = 0; tmp < AZF_IO_SIZE_MIXER; tmp += 2)
		snd_azf3328_dbgmisc("mixer 0x%02x: 0x%04x\n",
			tmp, snd_azf3328_mixer_inw(chip, tmp)
		);
#endif /* DEBUG_MISC */
}

static int __devinit
snd_azf3328_create(struct snd_card *card,
		   struct pci_dev *pci,
		   unsigned long device_type,
		   struct snd_azf3328 **rchip)
{
	struct snd_azf3328 *chip;
	int err;
	static struct snd_device_ops ops = {
		.dev_free =     snd_azf3328_dev_free,
	};
	u8 dma_init;
	enum snd_azf3328_codec_type codec_type;
	struct snd_azf3328_codec_data *codec_setup;

	*rchip = NULL;

	err = pci_enable_device(pci);
	if (err < 0)
		return err;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL) {
		err = -ENOMEM;
		goto out_err;
	}
	spin_lock_init(&chip->reg_lock);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	/* check if we can restrict PCI DMA transfers to 24 bits */
	if (pci_set_dma_mask(pci, DMA_BIT_MASK(24)) < 0 ||
	    pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(24)) < 0) {
		snd_printk(KERN_ERR "architecture does not support "
					"24bit PCI busmaster DMA\n"
		);
		err = -ENXIO;
		goto out_err;
	}

	err = pci_request_regions(pci, "Aztech AZF3328");
	if (err < 0)
		goto out_err;

	chip->ctrl_io  = pci_resource_start(pci, 0);
	chip->game_io  = pci_resource_start(pci, 1);
	chip->mpu_io   = pci_resource_start(pci, 2);
	chip->opl3_io  = pci_resource_start(pci, 3);
	chip->mixer_io = pci_resource_start(pci, 4);

	codec_setup = &chip->codecs[AZF_CODEC_PLAYBACK];
	codec_setup->io_base = chip->ctrl_io + AZF_IO_OFFS_CODEC_PLAYBACK;
	codec_setup->lock = &chip->reg_lock;
	codec_setup->type = AZF_CODEC_PLAYBACK;
	codec_setup->name = "PLAYBACK";

	codec_setup = &chip->codecs[AZF_CODEC_CAPTURE];
	codec_setup->io_base = chip->ctrl_io + AZF_IO_OFFS_CODEC_CAPTURE;
	codec_setup->lock = &chip->reg_lock;
	codec_setup->type = AZF_CODEC_CAPTURE;
	codec_setup->name = "CAPTURE";

	codec_setup = &chip->codecs[AZF_CODEC_I2S_OUT];
	codec_setup->io_base = chip->ctrl_io + AZF_IO_OFFS_CODEC_I2S_OUT;
	codec_setup->lock = &chip->reg_lock;
	codec_setup->type = AZF_CODEC_I2S_OUT;
	codec_setup->name = "I2S_OUT";

	if (request_irq(pci->irq, snd_azf3328_interrupt,
			IRQF_SHARED, KBUILD_MODNAME, chip)) {
		snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
		err = -EBUSY;
		goto out_err;
	}
	chip->irq = pci->irq;
	pci_set_master(pci);
	synchronize_irq(chip->irq);

	snd_azf3328_debug_show_ports(chip);

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0)
		goto out_err;

	/* create mixer interface & switches */
	err = snd_azf3328_mixer_new(chip);
	if (err < 0)
		goto out_err;

	/* standard codec init stuff */
		/* default DMA init value */
	dma_init = DMA_RUN_SOMETHING2|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE;

	for (codec_type = AZF_CODEC_PLAYBACK;
		codec_type <= AZF_CODEC_I2S_OUT; ++codec_type) {
		struct snd_azf3328_codec_data *codec =
			 &chip->codecs[codec_type];

		/* shutdown codecs to reduce power / noise */
			/* have ...ctrl_codec_activity() act properly */
		codec->running = 1;
		snd_azf3328_ctrl_codec_activity(chip, codec_type, 0);

		spin_lock_irq(codec->lock);
		snd_azf3328_codec_outb(codec, IDX_IO_CODEC_DMA_FLAGS,
						 dma_init);
		spin_unlock_irq(codec->lock);
	}

	snd_card_set_dev(card, &pci->dev);

	*rchip = chip;

	err = 0;
	goto out;

out_err:
	if (chip)
		snd_azf3328_free(chip);
	pci_disable_device(pci);

out:
	return err;
}

static int __devinit
snd_azf3328_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct snd_azf3328 *chip;
	struct snd_opl3 *opl3;
	int err;

	snd_azf3328_dbgcallenter();
	if (dev >= SNDRV_CARDS) {
		err = -ENODEV;
		goto out;
	}
	if (!enable[dev]) {
		dev++;
		err = -ENOENT;
		goto out;
	}

	err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
	if (err < 0)
		goto out;

	strcpy(card->driver, "AZF3328");
	strcpy(card->shortname, "Aztech AZF3328 (PCI168)");

	err = snd_azf3328_create(card, pci, pci_id->driver_data, &chip);
	if (err < 0)
		goto out_err;

	card->private_data = chip;

	/* chose to use MPU401_HW_AZT2320 ID instead of MPU401_HW_MPU401,
	   since our hardware ought to be similar, thus use same ID. */
	err = snd_mpu401_uart_new(
		card, 0,
		MPU401_HW_AZT2320, chip->mpu_io,
		MPU401_INFO_INTEGRATED | MPU401_INFO_IRQ_HOOK,
		-1, &chip->rmidi
	);
	if (err < 0) {
		snd_printk(KERN_ERR "azf3328: no MPU-401 device at 0x%lx?\n",
				chip->mpu_io
		);
		goto out_err;
	}

	err = snd_azf3328_timer(chip, 0);
	if (err < 0)
		goto out_err;

	err = snd_azf3328_pcm(chip);
	if (err < 0)
		goto out_err;

	if (snd_opl3_create(card, chip->opl3_io, chip->opl3_io+2,
			    OPL3_HW_AUTO, 1, &opl3) < 0) {
		snd_printk(KERN_ERR "azf3328: no OPL3 device at 0x%lx-0x%lx?\n",
			   chip->opl3_io, chip->opl3_io+2
		);
	} else {
		/* need to use IDs 1, 2 since ID 0 is snd_azf3328_timer above */
		err = snd_opl3_timer_new(opl3, 1, 2);
		if (err < 0)
			goto out_err;
		err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
		if (err < 0)
			goto out_err;
	}

	opl3->private_data = chip;

	sprintf(card->longname, "%s at 0x%lx, irq %i",
		card->shortname, chip->ctrl_io, chip->irq);

	err = snd_card_register(card);
	if (err < 0)
		goto out_err;

#ifdef MODULE
	printk(KERN_INFO
"azt3328: Sound driver for Aztech AZF3328-based soundcards such as PCI168.\n"
"azt3328: Hardware was completely undocumented, unfortunately.\n"
"azt3328: Feel free to contact andi AT lisas.de for bug reports etc.!\n"
"azt3328: User-scalable sequencer timer set to %dHz (1024000Hz / %d).\n",
	1024000 / seqtimer_scaling, seqtimer_scaling);
#endif

	snd_azf3328_gameport(chip, dev);

	pci_set_drvdata(pci, card);
	dev++;

	err = 0;
	goto out;

out_err:
	snd_printk(KERN_ERR "azf3328: something failed, exiting\n");
	snd_card_free(card);

out:
	snd_azf3328_dbgcallleave();
	return err;
}

static void __devexit
snd_azf3328_remove(struct pci_dev *pci)
{
	snd_azf3328_dbgcallenter();
	snd_card_free(pci_get_drvdata(pci));
	pci_set_drvdata(pci, NULL);
	snd_azf3328_dbgcallleave();
}

#ifdef CONFIG_PM
static inline void
snd_azf3328_suspend_regs(unsigned long io_addr, unsigned count, u32 *saved_regs)
{
	unsigned reg;

	for (reg = 0; reg < count; ++reg) {
		*saved_regs = inl(io_addr);
		snd_azf3328_dbgpm("suspend: io 0x%04lx: 0x%08x\n",
			io_addr, *saved_regs);
		++saved_regs;
		io_addr += sizeof(*saved_regs);
	}
}

static inline void
snd_azf3328_resume_regs(const u32 *saved_regs,
			unsigned long io_addr,
			unsigned count
)
{
	unsigned reg;

	for (reg = 0; reg < count; ++reg) {
		outl(*saved_regs, io_addr);
		snd_azf3328_dbgpm("resume: io 0x%04lx: 0x%08x --> 0x%08x\n",
			io_addr, *saved_regs, inl(io_addr));
		++saved_regs;
		io_addr += sizeof(*saved_regs);
	}
}

static inline void
snd_azf3328_suspend_ac97(struct snd_azf3328 *chip)
{
#ifdef AZF_USE_AC97_LAYER
	snd_ac97_suspend(chip->ac97);
#else
	snd_azf3328_suspend_regs(chip->mixer_io,
		ARRAY_SIZE(chip->saved_regs_mixer), chip->saved_regs_mixer);

	/* make sure to disable master volume etc. to prevent looping sound */
	snd_azf3328_mixer_mute_control_master(chip, 1);
	snd_azf3328_mixer_mute_control_pcm(chip, 1);
#endif /* AZF_USE_AC97_LAYER */
}

static inline void
snd_azf3328_resume_ac97(const struct snd_azf3328 *chip)
{
#ifdef AZF_USE_AC97_LAYER
	snd_ac97_resume(chip->ac97);
#else
	snd_azf3328_resume_regs(chip->saved_regs_mixer, chip->mixer_io,
					ARRAY_SIZE(chip->saved_regs_mixer));

	/* unfortunately with 32bit transfers, IDX_MIXER_PLAY_MASTER (0x02)
	   and IDX_MIXER_RESET (offset 0x00) get touched at the same time,
	   resulting in a mixer reset condition persisting until _after_
	   master vol was restored. Thus master vol needs an extra restore. */
	outw(((u16 *)chip->saved_regs_mixer)[1], chip->mixer_io + 2);
#endif /* AZF_USE_AC97_LAYER */
}

static int
snd_azf3328_suspend(struct pci_dev *pci, pm_message_t state)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct snd_azf3328 *chip = card->private_data;
	u16 *saved_regs_ctrl_u16;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

	/* same pcm object for playback/capture */
	snd_pcm_suspend_all(chip->pcm[AZF_CODEC_PLAYBACK]);
	snd_pcm_suspend_all(chip->pcm[AZF_CODEC_I2S_OUT]);

	snd_azf3328_suspend_ac97(chip);

	snd_azf3328_suspend_regs(chip->ctrl_io,
		ARRAY_SIZE(chip->saved_regs_ctrl), chip->saved_regs_ctrl);

	/* manually store the one currently relevant write-only reg, too */
	saved_regs_ctrl_u16 = (u16 *)chip->saved_regs_ctrl;
	saved_regs_ctrl_u16[IDX_IO_6AH / 2] = chip->shadow_reg_ctrl_6AH;

	snd_azf3328_suspend_regs(chip->game_io,
		ARRAY_SIZE(chip->saved_regs_game), chip->saved_regs_game);
	snd_azf3328_suspend_regs(chip->mpu_io,
		ARRAY_SIZE(chip->saved_regs_mpu), chip->saved_regs_mpu);
	snd_azf3328_suspend_regs(chip->opl3_io,
		ARRAY_SIZE(chip->saved_regs_opl3), chip->saved_regs_opl3);

	pci_disable_device(pci);
	pci_save_state(pci);
	pci_set_power_state(pci, pci_choose_state(pci, state));
	return 0;
}

static int
snd_azf3328_resume(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);
	const struct snd_azf3328 *chip = card->private_data;

	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		printk(KERN_ERR "azt3328: pci_enable_device failed, "
		       "disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);

	snd_azf3328_resume_regs(chip->saved_regs_game, chip->game_io,
					ARRAY_SIZE(chip->saved_regs_game));
	snd_azf3328_resume_regs(chip->saved_regs_mpu, chip->mpu_io,
					ARRAY_SIZE(chip->saved_regs_mpu));
	snd_azf3328_resume_regs(chip->saved_regs_opl3, chip->opl3_io,
					ARRAY_SIZE(chip->saved_regs_opl3));

	snd_azf3328_resume_ac97(chip);

	snd_azf3328_resume_regs(chip->saved_regs_ctrl, chip->ctrl_io,
					ARRAY_SIZE(chip->saved_regs_ctrl));

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}
#endif /* CONFIG_PM */


static struct pci_driver driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_azf3328_ids,
	.probe = snd_azf3328_probe,
	.remove = __devexit_p(snd_azf3328_remove),
#ifdef CONFIG_PM
	.suspend = snd_azf3328_suspend,
	.resume = snd_azf3328_resume,
#endif
};

static int __init
alsa_card_azf3328_init(void)
{
	int err;
	snd_azf3328_dbgcallenter();
	err = pci_register_driver(&driver);
	snd_azf3328_dbgcallleave();
	return err;
}

static void __exit
alsa_card_azf3328_exit(void)
{
	snd_azf3328_dbgcallenter();
	pci_unregister_driver(&driver);
	snd_azf3328_dbgcallleave();
}

module_init(alsa_card_azf3328_init)
module_exit(alsa_card_azf3328_exit)