summaryrefslogtreecommitdiffstats
path: root/sound/pci/via82xx.c
blob: 3c0205b91e10bb3b92c8eca5a101523d19714f43 (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
/*
 *   ALSA driver for VIA VT82xx (South Bridge)
 *
 *   VT82C686A/B/C, VT8233A/C, VT8235
 *
 *	Copyright (c) 2000 Jaroslav Kysela <perex@suse.cz>
 *	                   Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
 *                    2002 Takashi Iwai <tiwai@suse.de>
 *
 *   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
 *
 */

/*
 * Changes:
 *
 * Dec. 19, 2002	Takashi Iwai <tiwai@suse.de>
 *	- use the DSX channels for the first pcm playback.
 *	  (on VIA8233, 8233C and 8235 only)
 *	  this will allow you play simultaneously up to 4 streams.
 *	  multi-channel playback is assigned to the second device
 *	  on these chips.
 *	- support the secondary capture (on VIA8233/C,8235)
 *	- SPDIF support
 *	  the DSX3 channel can be used for SPDIF output.
 *	  on VIA8233A, this channel is assigned to the second pcm
 *	  playback.
 *	  the card config of alsa-lib will assign the correct
 *	  device for applications.
 *	- clean up the code, separate low-level initialization
 *	  routines for each chipset.
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/ac97_codec.h>
#include <sound/mpu401.h>
#include <sound/initval.h>

#if 0
#define POINTER_DEBUG
#endif

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("VIA VT82xx audio");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{VIA,VT82C686A/B/C,pci},{VIA,VT8233A/C,8235}}");

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

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
static long mpu_port[SNDRV_CARDS];
#ifdef SUPPORT_JOYSTICK
static int joystick[SNDRV_CARDS];
#endif
static int ac97_clock[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 48000};
static char *ac97_quirk[SNDRV_CARDS];
static int dxs_support[SNDRV_CARDS];

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable audio part of VIA 82xx bridge.");
module_param_array(mpu_port, long, NULL, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port. (VT82C686x only)");
#ifdef SUPPORT_JOYSTICK
module_param_array(joystick, bool, NULL, 0444);
MODULE_PARM_DESC(joystick, "Enable joystick. (VT82C686x only)");
#endif
module_param_array(ac97_clock, int, NULL, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
module_param_array(ac97_quirk, charp, NULL, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
module_param_array(dxs_support, int, NULL, 0444);
MODULE_PARM_DESC(dxs_support, "Support for DXS channels (0 = auto, 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA, 5 = enable any sample rate)");


/* revision numbers for via686 */
#define VIA_REV_686_A		0x10
#define VIA_REV_686_B		0x11
#define VIA_REV_686_C		0x12
#define VIA_REV_686_D		0x13
#define VIA_REV_686_E		0x14
#define VIA_REV_686_H		0x20

/* revision numbers for via8233 */
#define VIA_REV_PRE_8233	0x10	/* not in market */
#define VIA_REV_8233C		0x20	/* 2 rec, 4 pb, 1 multi-pb */
#define VIA_REV_8233		0x30	/* 2 rec, 4 pb, 1 multi-pb, spdif */
#define VIA_REV_8233A		0x40	/* 1 rec, 1 multi-pb, spdf */
#define VIA_REV_8235		0x50	/* 2 rec, 4 pb, 1 multi-pb, spdif */
#define VIA_REV_8237		0x60

/*
 *  Direct registers
 */

#define VIAREG(via, x) ((via)->port + VIA_REG_##x)
#define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)

/* common offsets */
#define VIA_REG_OFFSET_STATUS		0x00	/* byte - channel status */
#define   VIA_REG_STAT_ACTIVE		0x80	/* RO */
#define   VIA_REG_STAT_PAUSED		0x40	/* RO */
#define   VIA_REG_STAT_TRIGGER_QUEUED	0x08	/* RO */
#define   VIA_REG_STAT_STOPPED		0x04	/* RWC */
#define   VIA_REG_STAT_EOL		0x02	/* RWC */
#define   VIA_REG_STAT_FLAG		0x01	/* RWC */
#define VIA_REG_OFFSET_CONTROL		0x01	/* byte - channel control */
#define   VIA_REG_CTRL_START		0x80	/* WO */
#define   VIA_REG_CTRL_TERMINATE	0x40	/* WO */
#define   VIA_REG_CTRL_AUTOSTART	0x20
#define   VIA_REG_CTRL_PAUSE		0x08	/* RW */
#define   VIA_REG_CTRL_INT_STOP		0x04		
#define   VIA_REG_CTRL_INT_EOL		0x02
#define   VIA_REG_CTRL_INT_FLAG		0x01
#define   VIA_REG_CTRL_RESET		0x01	/* RW - probably reset? undocumented */
#define   VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
#define VIA_REG_OFFSET_TYPE		0x02	/* byte - channel type (686 only) */
#define   VIA_REG_TYPE_AUTOSTART	0x80	/* RW - autostart at EOL */
#define   VIA_REG_TYPE_16BIT		0x20	/* RW */
#define   VIA_REG_TYPE_STEREO		0x10	/* RW */
#define   VIA_REG_TYPE_INT_LLINE	0x00
#define   VIA_REG_TYPE_INT_LSAMPLE	0x04
#define   VIA_REG_TYPE_INT_LESSONE	0x08
#define   VIA_REG_TYPE_INT_MASK		0x0c
#define   VIA_REG_TYPE_INT_EOL		0x02
#define   VIA_REG_TYPE_INT_FLAG		0x01
#define VIA_REG_OFFSET_TABLE_PTR	0x04	/* dword - channel table pointer */
#define VIA_REG_OFFSET_CURR_PTR		0x04	/* dword - channel current pointer */
#define VIA_REG_OFFSET_STOP_IDX		0x08	/* dword - stop index, channel type, sample rate */
#define   VIA8233_REG_TYPE_16BIT	0x00200000	/* RW */
#define   VIA8233_REG_TYPE_STEREO	0x00100000	/* RW */
#define VIA_REG_OFFSET_CURR_COUNT	0x0c	/* dword - channel current count (24 bit) */
#define VIA_REG_OFFSET_CURR_INDEX	0x0f	/* byte - channel current index (for via8233 only) */

#define DEFINE_VIA_REGSET(name,val) \
enum {\
	VIA_REG_##name##_STATUS		= (val),\
	VIA_REG_##name##_CONTROL	= (val) + 0x01,\
	VIA_REG_##name##_TYPE		= (val) + 0x02,\
	VIA_REG_##name##_TABLE_PTR	= (val) + 0x04,\
	VIA_REG_##name##_CURR_PTR	= (val) + 0x04,\
	VIA_REG_##name##_STOP_IDX	= (val) + 0x08,\
	VIA_REG_##name##_CURR_COUNT	= (val) + 0x0c,\
}

/* playback block */
DEFINE_VIA_REGSET(PLAYBACK, 0x00);
DEFINE_VIA_REGSET(CAPTURE, 0x10);
DEFINE_VIA_REGSET(FM, 0x20);

/* AC'97 */
#define VIA_REG_AC97			0x80	/* dword */
#define   VIA_REG_AC97_CODEC_ID_MASK	(3<<30)
#define   VIA_REG_AC97_CODEC_ID_SHIFT	30
#define   VIA_REG_AC97_CODEC_ID_PRIMARY	0x00
#define   VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
#define   VIA_REG_AC97_SECONDARY_VALID	(1<<27)
#define   VIA_REG_AC97_PRIMARY_VALID	(1<<25)
#define   VIA_REG_AC97_BUSY		(1<<24)
#define   VIA_REG_AC97_READ		(1<<23)
#define   VIA_REG_AC97_CMD_SHIFT	16
#define   VIA_REG_AC97_CMD_MASK		0x7e
#define   VIA_REG_AC97_DATA_SHIFT	0
#define   VIA_REG_AC97_DATA_MASK	0xffff

#define VIA_REG_SGD_SHADOW		0x84	/* dword */
/* via686 */
#define   VIA_REG_SGD_STAT_PB_FLAG	(1<<0)
#define   VIA_REG_SGD_STAT_CP_FLAG	(1<<1)
#define   VIA_REG_SGD_STAT_FM_FLAG	(1<<2)
#define   VIA_REG_SGD_STAT_PB_EOL	(1<<4)
#define   VIA_REG_SGD_STAT_CP_EOL	(1<<5)
#define   VIA_REG_SGD_STAT_FM_EOL	(1<<6)
#define   VIA_REG_SGD_STAT_PB_STOP	(1<<8)
#define   VIA_REG_SGD_STAT_CP_STOP	(1<<9)
#define   VIA_REG_SGD_STAT_FM_STOP	(1<<10)
#define   VIA_REG_SGD_STAT_PB_ACTIVE	(1<<12)
#define   VIA_REG_SGD_STAT_CP_ACTIVE	(1<<13)
#define   VIA_REG_SGD_STAT_FM_ACTIVE	(1<<14)
/* via8233 */
#define   VIA8233_REG_SGD_STAT_FLAG	(1<<0)
#define   VIA8233_REG_SGD_STAT_EOL	(1<<1)
#define   VIA8233_REG_SGD_STAT_STOP	(1<<2)
#define   VIA8233_REG_SGD_STAT_ACTIVE	(1<<3)
#define VIA8233_INTR_MASK(chan) ((VIA8233_REG_SGD_STAT_FLAG|VIA8233_REG_SGD_STAT_EOL) << ((chan) * 4))
#define   VIA8233_REG_SGD_CHAN_SDX	0
#define   VIA8233_REG_SGD_CHAN_MULTI	4
#define   VIA8233_REG_SGD_CHAN_REC	6
#define   VIA8233_REG_SGD_CHAN_REC1	7

#define VIA_REG_GPI_STATUS		0x88
#define VIA_REG_GPI_INTR		0x8c

/* multi-channel and capture registers for via8233 */
DEFINE_VIA_REGSET(MULTPLAY, 0x40);
DEFINE_VIA_REGSET(CAPTURE_8233, 0x60);

/* via8233-specific registers */
#define VIA_REG_OFS_PLAYBACK_VOLUME_L	0x02	/* byte */
#define VIA_REG_OFS_PLAYBACK_VOLUME_R	0x03	/* byte */
#define VIA_REG_OFS_MULTPLAY_FORMAT	0x02	/* byte - format and channels */
#define   VIA_REG_MULTPLAY_FMT_8BIT	0x00
#define   VIA_REG_MULTPLAY_FMT_16BIT	0x80
#define   VIA_REG_MULTPLAY_FMT_CH_MASK	0x70	/* # channels << 4 (valid = 1,2,4,6) */
#define VIA_REG_OFS_CAPTURE_FIFO	0x02	/* byte - bit 6 = fifo  enable */
#define   VIA_REG_CAPTURE_FIFO_ENABLE	0x40

#define VIA_DXS_MAX_VOLUME		31	/* max. volume (attenuation) of reg 0x32/33 */

#define VIA_REG_CAPTURE_CHANNEL		0x63	/* byte - input select */
#define   VIA_REG_CAPTURE_CHANNEL_MIC	0x4
#define   VIA_REG_CAPTURE_CHANNEL_LINE	0
#define   VIA_REG_CAPTURE_SELECT_CODEC	0x03	/* recording source codec (0 = primary) */

#define VIA_TBL_BIT_FLAG	0x40000000
#define VIA_TBL_BIT_EOL		0x80000000

/* pci space */
#define VIA_ACLINK_STAT		0x40
#define  VIA_ACLINK_C11_READY	0x20
#define  VIA_ACLINK_C10_READY	0x10
#define  VIA_ACLINK_C01_READY	0x04 /* secondary codec ready */
#define  VIA_ACLINK_LOWPOWER	0x02 /* low-power state */
#define  VIA_ACLINK_C00_READY	0x01 /* primary codec ready */
#define VIA_ACLINK_CTRL		0x41
#define  VIA_ACLINK_CTRL_ENABLE	0x80 /* 0: disable, 1: enable */
#define  VIA_ACLINK_CTRL_RESET	0x40 /* 0: assert, 1: de-assert */
#define  VIA_ACLINK_CTRL_SYNC	0x20 /* 0: release SYNC, 1: force SYNC hi */
#define  VIA_ACLINK_CTRL_SDO	0x10 /* 0: release SDO, 1: force SDO hi */
#define  VIA_ACLINK_CTRL_VRA	0x08 /* 0: disable VRA, 1: enable VRA */
#define  VIA_ACLINK_CTRL_PCM	0x04 /* 0: disable PCM, 1: enable PCM */
#define  VIA_ACLINK_CTRL_FM	0x02 /* via686 only */
#define  VIA_ACLINK_CTRL_SB	0x01 /* via686 only */
#define  VIA_ACLINK_CTRL_INIT	(VIA_ACLINK_CTRL_ENABLE|\
				 VIA_ACLINK_CTRL_RESET|\
				 VIA_ACLINK_CTRL_PCM|\
				 VIA_ACLINK_CTRL_VRA)
#define VIA_FUNC_ENABLE		0x42
#define  VIA_FUNC_MIDI_PNP	0x80 /* FIXME: it's 0x40 in the datasheet! */
#define  VIA_FUNC_MIDI_IRQMASK	0x40 /* FIXME: not documented! */
#define  VIA_FUNC_RX2C_WRITE	0x20
#define  VIA_FUNC_SB_FIFO_EMPTY	0x10
#define  VIA_FUNC_ENABLE_GAME	0x08
#define  VIA_FUNC_ENABLE_FM	0x04
#define  VIA_FUNC_ENABLE_MIDI	0x02
#define  VIA_FUNC_ENABLE_SB	0x01
#define VIA_PNP_CONTROL		0x43
#define VIA_FM_NMI_CTRL		0x48
#define VIA8233_VOLCHG_CTRL	0x48
#define VIA8233_SPDIF_CTRL	0x49
#define  VIA8233_SPDIF_DX3	0x08
#define  VIA8233_SPDIF_SLOT_MASK	0x03
#define  VIA8233_SPDIF_SLOT_1011	0x00
#define  VIA8233_SPDIF_SLOT_34		0x01
#define  VIA8233_SPDIF_SLOT_78		0x02
#define  VIA8233_SPDIF_SLOT_69		0x03

/*
 */

#define VIA_DXS_AUTO	0
#define VIA_DXS_ENABLE	1
#define VIA_DXS_DISABLE	2
#define VIA_DXS_48K	3
#define VIA_DXS_NO_VRA	4
#define VIA_DXS_SRC	5


/*
 */

typedef struct _snd_via82xx via82xx_t;
typedef struct via_dev viadev_t;

/*
 * pcm stream
 */

struct snd_via_sg_table {
	unsigned int offset;
	unsigned int size;
} ;

#define VIA_TABLE_SIZE	255

struct via_dev {
	unsigned int reg_offset;
	unsigned long port;
	int direction;	/* playback = 0, capture = 1 */
        snd_pcm_substream_t *substream;
	int running;
	unsigned int tbl_entries; /* # descriptors */
	struct snd_dma_buffer table;
	struct snd_via_sg_table *idx_table;
	/* for recovery from the unexpected pointer */
	unsigned int lastpos;
	unsigned int fragsize;
	unsigned int bufsize;
	unsigned int bufsize2;
};


enum { TYPE_CARD_VIA686 = 1, TYPE_CARD_VIA8233 };
enum { TYPE_VIA686, TYPE_VIA8233, TYPE_VIA8233A };

#define VIA_MAX_DEVS	7	/* 4 playback, 1 multi, 2 capture */

struct via_rate_lock {
	spinlock_t lock;
	int rate;
	int used;
};

struct _snd_via82xx {
	int irq;

	unsigned long port;
	struct resource *mpu_res;
	int chip_type;
	unsigned char revision;

	unsigned char old_legacy;
	unsigned char old_legacy_cfg;
#ifdef CONFIG_PM
	unsigned char legacy_saved;
	unsigned char legacy_cfg_saved;
	unsigned char spdif_ctrl_saved;
	unsigned char capture_src_saved[2];
	unsigned int mpu_port_saved;
#endif

	unsigned char playback_volume[2]; /* for VIA8233/C/8235; default = 0 */

	unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */

	struct pci_dev *pci;
	snd_card_t *card;

	unsigned int num_devs;
	unsigned int playback_devno, multi_devno, capture_devno;
	viadev_t devs[VIA_MAX_DEVS];
	struct via_rate_lock rates[2]; /* playback and capture */
	unsigned int dxs_fixed: 1;	/* DXS channel accepts only 48kHz */
	unsigned int no_vra: 1;		/* no need to set VRA on DXS channels */
	unsigned int dxs_src: 1;	/* use full SRC capabilities of DXS */
	unsigned int spdif_on: 1;	/* only spdif rates work to external DACs */

	snd_pcm_t *pcms[2];
	snd_rawmidi_t *rmidi;

	ac97_bus_t *ac97_bus;
	ac97_t *ac97;
	unsigned int ac97_clock;
	unsigned int ac97_secondary;	/* secondary AC'97 codec is present */

	spinlock_t reg_lock;
	snd_info_entry_t *proc_entry;

#ifdef SUPPORT_JOYSTICK
	struct gameport *gameport;
#endif
};

static struct pci_device_id snd_via82xx_ids[] = {
	{ 0x1106, 0x3058, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA686, },	/* 686A */
	{ 0x1106, 0x3059, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA8233, },	/* VT8233 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_via82xx_ids);

/*
 */

/*
 * allocate and initialize the descriptor buffers
 * periods = number of periods
 * fragsize = period size in bytes
 */
static int build_via_table(viadev_t *dev, snd_pcm_substream_t *substream,
			   struct pci_dev *pci,
			   unsigned int periods, unsigned int fragsize)
{
	unsigned int i, idx, ofs, rest;
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);

	if (dev->table.area == NULL) {
		/* the start of each lists must be aligned to 8 bytes,
		 * but the kernel pages are much bigger, so we don't care
		 */
		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
					PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
					&dev->table) < 0)
			return -ENOMEM;
	}
	if (! dev->idx_table) {
		dev->idx_table = kmalloc(sizeof(*dev->idx_table) * VIA_TABLE_SIZE, GFP_KERNEL);
		if (! dev->idx_table)
			return -ENOMEM;
	}

	/* fill the entries */
	idx = 0;
	ofs = 0;
	for (i = 0; i < periods; i++) {
		rest = fragsize;
		/* fill descriptors for a period.
		 * a period can be split to several descriptors if it's
		 * over page boundary.
		 */
		do {
			unsigned int r;
			unsigned int flag;

			if (idx >= VIA_TABLE_SIZE) {
				snd_printk(KERN_ERR "via82xx: too much table size!\n");
				return -EINVAL;
			}
			((u32 *)dev->table.area)[idx << 1] = cpu_to_le32((u32)snd_pcm_sgbuf_get_addr(sgbuf, ofs));
			r = PAGE_SIZE - (ofs % PAGE_SIZE);
			if (rest < r)
				r = rest;
			rest -= r;
			if (! rest) {
				if (i == periods - 1)
					flag = VIA_TBL_BIT_EOL; /* buffer boundary */
				else
					flag = VIA_TBL_BIT_FLAG; /* period boundary */
			} else
				flag = 0; /* period continues to the next */
			// printk("via: tbl %d: at %d  size %d (rest %d)\n", idx, ofs, r, rest);
			((u32 *)dev->table.area)[(idx<<1) + 1] = cpu_to_le32(r | flag);
			dev->idx_table[idx].offset = ofs;
			dev->idx_table[idx].size = r;
			ofs += r;
			idx++;
		} while (rest > 0);
	}
	dev->tbl_entries = idx;
	dev->bufsize = periods * fragsize;
	dev->bufsize2 = dev->bufsize / 2;
	dev->fragsize = fragsize;
	return 0;
}


static int clean_via_table(viadev_t *dev, snd_pcm_substream_t *substream,
			   struct pci_dev *pci)
{
	if (dev->table.area) {
		snd_dma_free_pages(&dev->table);
		dev->table.area = NULL;
	}
	kfree(dev->idx_table);
	dev->idx_table = NULL;
	return 0;
}

/*
 *  Basic I/O
 */

static inline unsigned int snd_via82xx_codec_xread(via82xx_t *chip)
{
	return inl(VIAREG(chip, AC97));
}
 
static inline void snd_via82xx_codec_xwrite(via82xx_t *chip, unsigned int val)
{
	outl(val, VIAREG(chip, AC97));
}
 
static int snd_via82xx_codec_ready(via82xx_t *chip, int secondary)
{
	unsigned int timeout = 1000;	/* 1ms */
	unsigned int val;
	
	while (timeout-- > 0) {
		udelay(1);
		if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
			return val & 0xffff;
	}
	snd_printk(KERN_ERR "codec_ready: codec %i is not ready [0x%x]\n", secondary, snd_via82xx_codec_xread(chip));
	return -EIO;
}
 
static int snd_via82xx_codec_valid(via82xx_t *chip, int secondary)
{
	unsigned int timeout = 1000;	/* 1ms */
	unsigned int val, val1;
	unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
					 VIA_REG_AC97_SECONDARY_VALID;
	
	while (timeout-- > 0) {
		val = snd_via82xx_codec_xread(chip);
		val1 = val & (VIA_REG_AC97_BUSY | stat);
		if (val1 == stat)
			return val & 0xffff;
		udelay(1);
	}
	return -EIO;
}
 
static void snd_via82xx_codec_wait(ac97_t *ac97)
{
	via82xx_t *chip = ac97->private_data;
	int err;
	err = snd_via82xx_codec_ready(chip, ac97->num);
	/* here we need to wait fairly for long time.. */
	msleep(500);
}

static void snd_via82xx_codec_write(ac97_t *ac97,
				    unsigned short reg,
				    unsigned short val)
{
	via82xx_t *chip = ac97->private_data;
	unsigned int xval;
	
	xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
	xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
	xval |= reg << VIA_REG_AC97_CMD_SHIFT;
	xval |= val << VIA_REG_AC97_DATA_SHIFT;
	snd_via82xx_codec_xwrite(chip, xval);
	snd_via82xx_codec_ready(chip, ac97->num);
}

static unsigned short snd_via82xx_codec_read(ac97_t *ac97, unsigned short reg)
{
	via82xx_t *chip = ac97->private_data;
	unsigned int xval, val = 0xffff;
	int again = 0;

	xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
	xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
	xval |= VIA_REG_AC97_READ;
	xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
      	while (1) {
      		if (again++ > 3) {
			snd_printk(KERN_ERR "codec_read: codec %i is not valid [0x%x]\n", ac97->num, snd_via82xx_codec_xread(chip));
		      	return 0xffff;
		}
		snd_via82xx_codec_xwrite(chip, xval);
		udelay (20);
		if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
			udelay(25);
			val = snd_via82xx_codec_xread(chip);
			break;
		}
	}
	return val & 0xffff;
}

static void snd_via82xx_channel_reset(via82xx_t *chip, viadev_t *viadev)
{
	outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
	     VIADEV_REG(viadev, OFFSET_CONTROL));
	inb(VIADEV_REG(viadev, OFFSET_CONTROL));
	udelay(50);
	/* disable interrupts */
	outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
	/* clear interrupts */
	outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
	outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
	// outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
	viadev->lastpos = 0;
}


/*
 *  Interrupt handler
 */

static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	via82xx_t *chip = dev_id;
	unsigned int status;
	unsigned int i;

	status = inl(VIAREG(chip, SGD_SHADOW));
	if (! (status & chip->intr_mask)) {
		if (chip->rmidi)
			/* check mpu401 interrupt */
			return snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data, regs);
		return IRQ_NONE;
	}

	/* check status for each stream */
	spin_lock(&chip->reg_lock);
	for (i = 0; i < chip->num_devs; i++) {
		viadev_t *viadev = &chip->devs[i];
		unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
		c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
		if (! c_status)
			continue;
		if (viadev->substream && viadev->running) {
			spin_unlock(&chip->reg_lock);
			snd_pcm_period_elapsed(viadev->substream);
			spin_lock(&chip->reg_lock);
		}
		outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
	}
	spin_unlock(&chip->reg_lock);
	return IRQ_HANDLED;
}

/*
 *  PCM callbacks
 */

/*
 * trigger callback
 */
static int snd_via82xx_pcm_trigger(snd_pcm_substream_t * substream, int cmd)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	unsigned char val;

	if (chip->chip_type != TYPE_VIA686)
		val = VIA_REG_CTRL_INT;
	else
		val = 0;
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		val |= VIA_REG_CTRL_START;
		viadev->running = 1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		val = VIA_REG_CTRL_TERMINATE;
		viadev->running = 0;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		val |= VIA_REG_CTRL_PAUSE;
		viadev->running = 0;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		viadev->running = 1;
		break;
	default:
		return -EINVAL;
	}
	outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
	if (cmd == SNDRV_PCM_TRIGGER_STOP)
		snd_via82xx_channel_reset(chip, viadev);
	return 0;
}


/*
 * pointer callbacks
 */

/*
 * calculate the linear position at the given sg-buffer index and the rest count
 */

#define check_invalid_pos(viadev,pos) \
	((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 || viadev->lastpos < viadev->bufsize2))

static inline unsigned int calc_linear_pos(viadev_t *viadev, unsigned int idx, unsigned int count)
{
	unsigned int size, base, res;

	size = viadev->idx_table[idx].size;
	base = viadev->idx_table[idx].offset;
	res = base + size - count;

	/* check the validity of the calculated position */
	if (size < count) {
		snd_printd(KERN_ERR "invalid via82xx_cur_ptr (size = %d, count = %d)\n", (int)size, (int)count);
		res = viadev->lastpos;
	} else {
		if (! count) {
			/* Some mobos report count = 0 on the DMA boundary,
			 * i.e. count = size indeed.
			 * Let's check whether this step is above the expected size.
			 */
			int delta = res - viadev->lastpos;
			if (delta < 0)
				delta += viadev->bufsize;
			if ((unsigned int)delta > viadev->fragsize)
				res = base;
		}
		if (check_invalid_pos(viadev, res)) {
#ifdef POINTER_DEBUG
			printk(KERN_DEBUG "fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n", idx, viadev->tbl_entries, viadev->lastpos, viadev->bufsize2, viadev->idx_table[idx].offset, viadev->idx_table[idx].size, count);
#endif
			/* count register returns full size when end of buffer is reached */
			res = base + size;
			if (check_invalid_pos(viadev, res)) {
				snd_printd(KERN_ERR "invalid via82xx_cur_ptr (2), using last valid pointer\n");
				res = viadev->lastpos;
			}
		}
	}
	viadev->lastpos = res; /* remember the last position */
	if (res >= viadev->bufsize)
		res -= viadev->bufsize;
	return res;
}

/*
 * get the current pointer on via686
 */
static snd_pcm_uframes_t snd_via686_pcm_pointer(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	unsigned int idx, ptr, count, res;

	snd_assert(viadev->tbl_entries, return 0);
	if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
		return 0;

	spin_lock(&chip->reg_lock);
	count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
	/* The via686a does not have the current index register,
	 * so we need to calculate the index from CURR_PTR.
	 */
	ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
	if (ptr <= (unsigned int)viadev->table.addr)
		idx = 0;
	else /* CURR_PTR holds the address + 8 */
		idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) % viadev->tbl_entries;
	res = calc_linear_pos(viadev, idx, count);
	spin_unlock(&chip->reg_lock);

	return bytes_to_frames(substream->runtime, res);
}

/*
 * get the current pointer on via823x
 */
static snd_pcm_uframes_t snd_via8233_pcm_pointer(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	unsigned int idx, count, res;
	int timeout = 5000;
	
	snd_assert(viadev->tbl_entries, return 0);
	if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
		return 0;
	spin_lock(&chip->reg_lock);
	do {
		count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT));
		/* some mobos read 0 count */
		if ((count & 0xffffff) || ! viadev->running)
			break;
	} while (--timeout);
	if (! timeout)
		snd_printd(KERN_ERR "zero position is read\n");
	idx = count >> 24;
	if (idx >= viadev->tbl_entries) {
#ifdef POINTER_DEBUG
		printk("fail: invalid idx = %i/%i\n", idx, viadev->tbl_entries);
#endif
		res = viadev->lastpos;
	} else {
		count &= 0xffffff;
		res = calc_linear_pos(viadev, idx, count);
	}
	spin_unlock(&chip->reg_lock);

	return bytes_to_frames(substream->runtime, res);
}


/*
 * hw_params callback:
 * allocate the buffer and build up the buffer description table
 */
static int snd_via82xx_hw_params(snd_pcm_substream_t * substream,
				 snd_pcm_hw_params_t * hw_params)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	int err;

	err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
	if (err < 0)
		return err;
	err = build_via_table(viadev, substream, chip->pci,
			      params_periods(hw_params),
			      params_period_bytes(hw_params));
	if (err < 0)
		return err;

	return 0;
}

/*
 * hw_free callback:
 * clean up the buffer description table and release the buffer
 */
static int snd_via82xx_hw_free(snd_pcm_substream_t * substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;

	clean_via_table(viadev, substream, chip->pci);
	snd_pcm_lib_free_pages(substream);
	return 0;
}


/*
 * set up the table pointer
 */
static void snd_via82xx_set_table_ptr(via82xx_t *chip, viadev_t *viadev)
{
	snd_via82xx_codec_ready(chip, 0);
	outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
	udelay(20);
	snd_via82xx_codec_ready(chip, 0);
}

/*
 * prepare callback for playback and capture on via686
 */
static void via686_setup_format(via82xx_t *chip, viadev_t *viadev, snd_pcm_runtime_t *runtime)
{
	snd_via82xx_channel_reset(chip, viadev);
	/* this must be set after channel_reset */
	snd_via82xx_set_table_ptr(chip, viadev);
	outb(VIA_REG_TYPE_AUTOSTART |
	     (runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA_REG_TYPE_16BIT : 0) |
	     (runtime->channels > 1 ? VIA_REG_TYPE_STEREO : 0) |
	     ((viadev->reg_offset & 0x10) == 0 ? VIA_REG_TYPE_INT_LSAMPLE : 0) |
	     VIA_REG_TYPE_INT_EOL |
	     VIA_REG_TYPE_INT_FLAG, VIADEV_REG(viadev, OFFSET_TYPE));
}

static int snd_via686_playback_prepare(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	snd_pcm_runtime_t *runtime = substream->runtime;

	snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
	snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);
	via686_setup_format(chip, viadev, runtime);
	return 0;
}

static int snd_via686_capture_prepare(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	snd_pcm_runtime_t *runtime = substream->runtime;

	snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
	via686_setup_format(chip, viadev, runtime);
	return 0;
}

/*
 * lock the current rate
 */
static int via_lock_rate(struct via_rate_lock *rec, int rate)
{
	int changed = 0;

	spin_lock_irq(&rec->lock);
	if (rec->rate != rate) {
		if (rec->rate && rec->used > 1) /* already set */
			changed = -EINVAL;
		else {
			rec->rate = rate;
			changed = 1;
		}
	}
	spin_unlock_irq(&rec->lock);
	return changed;
}

/*
 * prepare callback for DSX playback on via823x
 */
static int snd_via8233_playback_prepare(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	snd_pcm_runtime_t *runtime = substream->runtime;
	int ac97_rate = chip->dxs_src ? 48000 : runtime->rate;
	int rate_changed;
	u32 rbits;

	if ((rate_changed = via_lock_rate(&chip->rates[0], ac97_rate)) < 0)
		return rate_changed;
	if (rate_changed)
		snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
				  chip->no_vra ? 48000 : runtime->rate);
	if (chip->spdif_on && viadev->reg_offset == 0x30)
		snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);

	if (runtime->rate == 48000)
		rbits = 0xfffff;
	else
		rbits = (0x100000 / 48000) * runtime->rate + ((0x100000 % 48000) * runtime->rate) / 48000;
	snd_assert((rbits & ~0xfffff) == 0, return -EINVAL);
	snd_via82xx_channel_reset(chip, viadev);
	snd_via82xx_set_table_ptr(chip, viadev);
	outb(chip->playback_volume[0], VIADEV_REG(viadev, OFS_PLAYBACK_VOLUME_L));
	outb(chip->playback_volume[1], VIADEV_REG(viadev, OFS_PLAYBACK_VOLUME_R));
	outl((runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA8233_REG_TYPE_16BIT : 0) | /* format */
	     (runtime->channels > 1 ? VIA8233_REG_TYPE_STEREO : 0) | /* stereo */
	     rbits | /* rate */
	     0xff000000,    /* STOP index is never reached */
	     VIADEV_REG(viadev, OFFSET_STOP_IDX));
	udelay(20);
	snd_via82xx_codec_ready(chip, 0);
	return 0;
}

/*
 * prepare callback for multi-channel playback on via823x
 */
static int snd_via8233_multi_prepare(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned int slots;
	int fmt;

	if (via_lock_rate(&chip->rates[0], runtime->rate) < 0)
		return -EINVAL;
	snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
	snd_ac97_set_rate(chip->ac97, AC97_PCM_SURR_DAC_RATE, runtime->rate);
	snd_ac97_set_rate(chip->ac97, AC97_PCM_LFE_DAC_RATE, runtime->rate);
	snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);
	snd_via82xx_channel_reset(chip, viadev);
	snd_via82xx_set_table_ptr(chip, viadev);

	fmt = (runtime->format == SNDRV_PCM_FORMAT_S16_LE) ? VIA_REG_MULTPLAY_FMT_16BIT : VIA_REG_MULTPLAY_FMT_8BIT;
	fmt |= runtime->channels << 4;
	outb(fmt, VIADEV_REG(viadev, OFS_MULTPLAY_FORMAT));
#if 0
	if (chip->revision == VIA_REV_8233A)
		slots = 0;
	else
#endif
	{
		/* set sample number to slot 3, 4, 7, 8, 6, 9 (for VIA8233/C,8235) */
		/* corresponding to FL, FR, RL, RR, C, LFE ?? */
		switch (runtime->channels) {
		case 1: slots = (1<<0) | (1<<4); break;
		case 2: slots = (1<<0) | (2<<4); break;
		case 3: slots = (1<<0) | (2<<4) | (5<<8); break;
		case 4: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12); break;
		case 5: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16); break;
		case 6: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16) | (6<<20); break;
		default: slots = 0; break;
		}
	}
	/* STOP index is never reached */
	outl(0xff000000 | slots, VIADEV_REG(viadev, OFFSET_STOP_IDX));
	udelay(20);
	snd_via82xx_codec_ready(chip, 0);
	return 0;
}

/*
 * prepare callback for capture on via823x
 */
static int snd_via8233_capture_prepare(snd_pcm_substream_t *substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	snd_pcm_runtime_t *runtime = substream->runtime;

	if (via_lock_rate(&chip->rates[1], runtime->rate) < 0)
		return -EINVAL;
	snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
	snd_via82xx_channel_reset(chip, viadev);
	snd_via82xx_set_table_ptr(chip, viadev);
	outb(VIA_REG_CAPTURE_FIFO_ENABLE, VIADEV_REG(viadev, OFS_CAPTURE_FIFO));
	outl((runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA8233_REG_TYPE_16BIT : 0) |
	     (runtime->channels > 1 ? VIA8233_REG_TYPE_STEREO : 0) |
	     0xff000000,    /* STOP index is never reached */
	     VIADEV_REG(viadev, OFFSET_STOP_IDX));
	udelay(20);
	snd_via82xx_codec_ready(chip, 0);
	return 0;
}


/*
 * pcm hardware definition, identical for both playback and capture
 */
static snd_pcm_hardware_t snd_via82xx_hw =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID |
				 /* SNDRV_PCM_INFO_RESUME | */
				 SNDRV_PCM_INFO_PAUSE),
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_48000,
	.rate_min =		48000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	128 * 1024,
	.period_bytes_min =	32,
	.period_bytes_max =	128 * 1024,
	.periods_min =		2,
	.periods_max =		VIA_TABLE_SIZE / 2,
	.fifo_size =		0,
};


/*
 * open callback skeleton
 */
static int snd_via82xx_pcm_open(via82xx_t *chip, viadev_t *viadev, snd_pcm_substream_t * substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	int err;
	struct via_rate_lock *ratep;

	runtime->hw = snd_via82xx_hw;
	
	/* set the hw rate condition */
	ratep = &chip->rates[viadev->direction];
	spin_lock_irq(&ratep->lock);
	ratep->used++;
	if (chip->spdif_on && viadev->reg_offset == 0x30) {
		/* DXS#3 and spdif is on */
		runtime->hw.rates = chip->ac97->rates[AC97_RATES_SPDIF];
		snd_pcm_limit_hw_rates(runtime);
	} else if (chip->dxs_fixed && viadev->reg_offset < 0x40) {
		/* fixed DXS playback rate */
		runtime->hw.rates = SNDRV_PCM_RATE_48000;
		runtime->hw.rate_min = runtime->hw.rate_max = 48000;
	} else if (chip->dxs_src && viadev->reg_offset < 0x40) {
		/* use full SRC capabilities of DXS */
		runtime->hw.rates = (SNDRV_PCM_RATE_CONTINUOUS |
				     SNDRV_PCM_RATE_8000_48000);
		runtime->hw.rate_min = 8000;
		runtime->hw.rate_max = 48000;
	} else if (! ratep->rate) {
		int idx = viadev->direction ? AC97_RATES_ADC : AC97_RATES_FRONT_DAC;
		runtime->hw.rates = chip->ac97->rates[idx];
		snd_pcm_limit_hw_rates(runtime);
	} else {
		/* a fixed rate */
		runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
		runtime->hw.rate_max = runtime->hw.rate_min = ratep->rate;
	}
	spin_unlock_irq(&ratep->lock);

	/* we may remove following constaint when we modify table entries
	   in interrupt */
	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
		return err;

	runtime->private_data = viadev;
	viadev->substream = substream;

	return 0;
}


/*
 * open callback for playback on via686 and via823x DSX
 */
static int snd_via82xx_playback_open(snd_pcm_substream_t * substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = &chip->devs[chip->playback_devno + substream->number];
	int err;

	if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
		return err;
	return 0;
}

/*
 * open callback for playback on via823x multi-channel
 */
static int snd_via8233_multi_open(snd_pcm_substream_t * substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = &chip->devs[chip->multi_devno];
	int err;
	/* channels constraint for VIA8233A
	 * 3 and 5 channels are not supported
	 */
	static unsigned int channels[] = {
		1, 2, 4, 6
	};
	static snd_pcm_hw_constraint_list_t hw_constraints_channels = {
		.count = ARRAY_SIZE(channels),
		.list = channels,
		.mask = 0,
	};

	if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
		return err;
	substream->runtime->hw.channels_max = 6;
	if (chip->revision == VIA_REV_8233A)
		snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, &hw_constraints_channels);
	return 0;
}

/*
 * open callback for capture on via686 and via823x
 */
static int snd_via82xx_capture_open(snd_pcm_substream_t * substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];

	return snd_via82xx_pcm_open(chip, viadev, substream);
}

/*
 * close callback
 */
static int snd_via82xx_pcm_close(snd_pcm_substream_t * substream)
{
	via82xx_t *chip = snd_pcm_substream_chip(substream);
	viadev_t *viadev = (viadev_t *)substream->runtime->private_data;
	struct via_rate_lock *ratep;

	/* release the rate lock */
	ratep = &chip->rates[viadev->direction];
	spin_lock_irq(&ratep->lock);
	ratep->used--;
	if (! ratep->used)
		ratep->rate = 0;
	spin_unlock_irq(&ratep->lock);

	viadev->substream = NULL;
	return 0;
}


/* via686 playback callbacks */
static snd_pcm_ops_t snd_via686_playback_ops = {
	.open =		snd_via82xx_playback_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via686_playback_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via686_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};

/* via686 capture callbacks */
static snd_pcm_ops_t snd_via686_capture_ops = {
	.open =		snd_via82xx_capture_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via686_capture_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via686_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};

/* via823x DSX playback callbacks */
static snd_pcm_ops_t snd_via8233_playback_ops = {
	.open =		snd_via82xx_playback_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via8233_playback_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via8233_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};

/* via823x multi-channel playback callbacks */
static snd_pcm_ops_t snd_via8233_multi_ops = {
	.open =		snd_via8233_multi_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via8233_multi_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via8233_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};

/* via823x capture callbacks */
static snd_pcm_ops_t snd_via8233_capture_ops = {
	.open =		snd_via82xx_capture_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via8233_capture_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via8233_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};


static void init_viadev(via82xx_t *chip, int idx, unsigned int reg_offset, int direction)
{
	chip->devs[idx].reg_offset = reg_offset;
	chip->devs[idx].direction = direction;
	chip->devs[idx].port = chip->port + reg_offset;
}

/*
 * create pcm instances for VIA8233, 8233C and 8235 (not 8233A)
 */
static int __devinit snd_via8233_pcm_new(via82xx_t *chip)
{
	snd_pcm_t *pcm;
	int i, err;

	chip->playback_devno = 0;	/* x 4 */
	chip->multi_devno = 4;		/* x 1 */
	chip->capture_devno = 5;	/* x 2 */
	chip->num_devs = 7;
	chip->intr_mask = 0x33033333; /* FLAG|EOL for rec0-1, mc, sdx0-3 */

	/* PCM #0:  4 DSX playbacks and 1 capture */
	err = snd_pcm_new(chip->card, chip->card->shortname, 0, 4, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
	pcm->private_data = chip;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcms[0] = pcm;
	/* set up playbacks */
	for (i = 0; i < 4; i++)
		init_viadev(chip, i, 0x10 * i, 0);
	/* capture */
	init_viadev(chip, chip->capture_devno, VIA_REG_CAPTURE_8233_STATUS, 1);

	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
							 snd_dma_pci_data(chip->pci), 64*1024, 128*1024)) < 0)
		return err;

	/* PCM #1:  multi-channel playback and 2nd capture */
	err = snd_pcm_new(chip->card, chip->card->shortname, 1, 1, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_multi_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
	pcm->private_data = chip;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcms[1] = pcm;
	/* set up playback */
	init_viadev(chip, chip->multi_devno, VIA_REG_MULTPLAY_STATUS, 0);
	/* set up capture */
	init_viadev(chip, chip->capture_devno + 1, VIA_REG_CAPTURE_8233_STATUS + 0x10, 1);

	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
						         snd_dma_pci_data(chip->pci), 64*1024, 128*1024)) < 0)
		return err;

	return 0;
}

/*
 * create pcm instances for VIA8233A
 */
static int __devinit snd_via8233a_pcm_new(via82xx_t *chip)
{
	snd_pcm_t *pcm;
	int err;

	chip->multi_devno = 0;
	chip->playback_devno = 1;
	chip->capture_devno = 2;
	chip->num_devs = 3;
	chip->intr_mask = 0x03033000; /* FLAG|EOL for rec0, mc, sdx3 */

	/* PCM #0:  multi-channel playback and capture */
	err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_multi_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
	pcm->private_data = chip;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcms[0] = pcm;
	/* set up playback */
	init_viadev(chip, chip->multi_devno, VIA_REG_MULTPLAY_STATUS, 0);
	/* capture */
	init_viadev(chip, chip->capture_devno, VIA_REG_CAPTURE_8233_STATUS, 1);

	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
							 snd_dma_pci_data(chip->pci), 64*1024, 128*1024)) < 0)
		return err;

	/* SPDIF supported? */
	if (! ac97_can_spdif(chip->ac97))
		return 0;

	/* PCM #1:  DXS3 playback (for spdif) */
	err = snd_pcm_new(chip->card, chip->card->shortname, 1, 1, 0, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_playback_ops);
	pcm->private_data = chip;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcms[1] = pcm;
	/* set up playback */
	init_viadev(chip, chip->playback_devno, 0x30, 0);

	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
							 snd_dma_pci_data(chip->pci), 64*1024, 128*1024)) < 0)
		return err;

	return 0;
}

/*
 * create a pcm instance for via686a/b
 */
static int __devinit snd_via686_pcm_new(via82xx_t *chip)
{
	snd_pcm_t *pcm;
	int err;

	chip->playback_devno = 0;
	chip->capture_devno = 1;
	chip->num_devs = 2;
	chip->intr_mask = 0x77; /* FLAG | EOL for PB, CP, FM */

	err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
	pcm->private_data = chip;
	strcpy(pcm->name, chip->card->shortname);
	chip->pcms[0] = pcm;
	init_viadev(chip, 0, VIA_REG_PLAYBACK_STATUS, 0);
	init_viadev(chip, 1, VIA_REG_CAPTURE_STATUS, 1);

	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
							 snd_dma_pci_data(chip->pci), 64*1024, 128*1024)) < 0)
		return err;

	return 0;
}


/*
 *  Mixer part
 */

static int snd_via8233_capture_source_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	/* formerly they were "Line" and "Mic", but it looks like that they
	 * have nothing to do with the actual physical connections...
	 */
	static char *texts[2] = {
		"Input1", "Input2"
	};
	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 1;
	uinfo->value.enumerated.items = 2;
	if (uinfo->value.enumerated.item >= 2)
		uinfo->value.enumerated.item = 1;
	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
	return 0;
}

static int snd_via8233_capture_source_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long port = chip->port + (kcontrol->id.index ? (VIA_REG_CAPTURE_CHANNEL + 0x10) : VIA_REG_CAPTURE_CHANNEL);
	ucontrol->value.enumerated.item[0] = inb(port) & VIA_REG_CAPTURE_CHANNEL_MIC ? 1 : 0;
	return 0;
}

static int snd_via8233_capture_source_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned long port = chip->port + (kcontrol->id.index ? (VIA_REG_CAPTURE_CHANNEL + 0x10) : VIA_REG_CAPTURE_CHANNEL);
	u8 val, oval;

	spin_lock_irq(&chip->reg_lock);
	oval = inb(port);
	val = oval & ~VIA_REG_CAPTURE_CHANNEL_MIC;
	if (ucontrol->value.enumerated.item[0])
		val |= VIA_REG_CAPTURE_CHANNEL_MIC;
	if (val != oval)
		outb(val, port);
	spin_unlock_irq(&chip->reg_lock);
	return val != oval;
}

static snd_kcontrol_new_t snd_via8233_capture_source __devinitdata = {
	.name = "Input Source Select",
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.info = snd_via8233_capture_source_info,
	.get = snd_via8233_capture_source_get,
	.put = snd_via8233_capture_source_put,
};

static int snd_via8233_dxs3_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1;
	return 0;
}

static int snd_via8233_dxs3_spdif_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	u8 val;

	pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &val);
	ucontrol->value.integer.value[0] = (val & VIA8233_SPDIF_DX3) ? 1 : 0;
	return 0;
}

static int snd_via8233_dxs3_spdif_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	u8 val, oval;

	pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &oval);
	val = oval & ~VIA8233_SPDIF_DX3;
	if (ucontrol->value.integer.value[0])
		val |= VIA8233_SPDIF_DX3;
	/* save the spdif flag for rate filtering */
	chip->spdif_on = ucontrol->value.integer.value[0] ? 1 : 0;
	if (val != oval) {
		pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, val);
		return 1;
	}
	return 0;
}

static snd_kcontrol_new_t snd_via8233_dxs3_spdif_control __devinitdata = {
	.name = SNDRV_CTL_NAME_IEC958("Output ",NONE,SWITCH),
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.info = snd_via8233_dxs3_spdif_info,
	.get = snd_via8233_dxs3_spdif_get,
	.put = snd_via8233_dxs3_spdif_put,
};

static int snd_via8233_dxs_volume_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = VIA_DXS_MAX_VOLUME;
	return 0;
}

static int snd_via8233_dxs_volume_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.integer.value[0] = VIA_DXS_MAX_VOLUME - chip->playback_volume[0];
	ucontrol->value.integer.value[1] = VIA_DXS_MAX_VOLUME - chip->playback_volume[1];
	return 0;
}

static int snd_via8233_dxs_volume_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	via82xx_t *chip = snd_kcontrol_chip(kcontrol);
	unsigned int idx;
	unsigned char val;
	int i, change = 0;

	for (i = 0; i < 2; i++) {
		val = ucontrol->value.integer.value[i];
		if (val > VIA_DXS_MAX_VOLUME)
			val = VIA_DXS_MAX_VOLUME;
		val = VIA_DXS_MAX_VOLUME - val;
		if (val != chip->playback_volume[i]) {
			change = 1;
			chip->playback_volume[i] = val;
			for (idx = 0; idx < 4; idx++) {
				unsigned long port = chip->port + 0x10 * idx;
				outb(val, port + VIA_REG_OFS_PLAYBACK_VOLUME_L + i);
			}
		}
	}
	return change;
}

static snd_kcontrol_new_t snd_via8233_dxs_volume_control __devinitdata = {
	.name = "PCM Playback Volume",
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.info = snd_via8233_dxs_volume_info,
	.get = snd_via8233_dxs_volume_get,
	.put = snd_via8233_dxs_volume_put,
};

/*
 */

static void snd_via82xx_mixer_free_ac97_bus(ac97_bus_t *bus)
{
	via82xx_t *chip = bus->private_data;
	chip->ac97_bus = NULL;
}

static void snd_via82xx_mixer_free_ac97(ac97_t *ac97)
{
	via82xx_t *chip = ac97->private_data;
	chip->ac97 = NULL;
}

static struct ac97_quirk ac97_quirks[] = {
	{
		.subvendor = 0x1106,
		.subdevice = 0x4161,
		.codec_id = 0x56494161, /* VT1612A */
		.name = "Soltek SL-75DRV5",
		.type = AC97_TUNE_NONE
	},
	{	/* FIXME: which codec? */
		.subvendor = 0x1106,
		.subdevice = 0x4161,
		.name = "ASRock K7VT2",
		.type = AC97_TUNE_HP_ONLY
	},
	{
		.subvendor = 0x1019,
		.subdevice = 0x0a81,
		.name = "ECS K7VTA3",
		.type = AC97_TUNE_HP_ONLY
	},
	{
		.subvendor = 0x1019,
		.subdevice = 0x0a85,
		.name = "ECS L7VMM2",
		.type = AC97_TUNE_HP_ONLY
	},
	{
		.subvendor = 0x1849,
		.subdevice = 0x3059,
		.name = "ASRock K7VM2",
		.type = AC97_TUNE_HP_ONLY	/* VT1616 */
	},
	{
		.subvendor = 0x14cd,
		.subdevice = 0x7002,
		.name = "Unknown",
		.type = AC97_TUNE_ALC_JACK
	},
	{
		.subvendor = 0x1071,
		.subdevice = 0x8590,
		.name = "Mitac Mobo",
		.type = AC97_TUNE_ALC_JACK
	},
	{
		.subvendor = 0x161f,
		.subdevice = 0x202b,
		.name = "Arima Notebook",
		.type = AC97_TUNE_HP_ONLY,
	},
	{ } /* terminator */
};

static int __devinit snd_via82xx_mixer_new(via82xx_t *chip, const char *quirk_override)
{
	ac97_template_t ac97;
	int err;
	static ac97_bus_ops_t ops = {
		.write = snd_via82xx_codec_write,
		.read = snd_via82xx_codec_read,
		.wait = snd_via82xx_codec_wait,
	};

	if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
		return err;
	chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
	chip->ac97_bus->clock = chip->ac97_clock;
	chip->ac97_bus->shared_type = AC97_SHARED_TYPE_VIA;

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = chip;
	ac97.private_free = snd_via82xx_mixer_free_ac97;
	ac97.pci = chip->pci;
	if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
		return err;

	snd_ac97_tune_hardware(chip->ac97, ac97_quirks, quirk_override);

	if (chip->chip_type != TYPE_VIA686) {
		/* use slot 10/11 */
		snd_ac97_update_bits(chip->ac97, AC97_EXTENDED_STATUS, 0x03 << 4, 0x03 << 4);
	}

	return 0;
}

#ifdef SUPPORT_JOYSTICK
#define JOYSTICK_ADDR	0x200
static int __devinit snd_via686_create_gameport(via82xx_t *chip, int dev, unsigned char *legacy)
{
	struct gameport *gp;
	struct resource *r;

	if (!joystick[dev])
		return -ENODEV;

	r = request_region(JOYSTICK_ADDR, 8, "VIA686 gameport");
	if (!r) {
		printk(KERN_WARNING "via82xx: cannot reserve joystick port 0x%#x\n", JOYSTICK_ADDR);
		return -EBUSY;
	}

	chip->gameport = gp = gameport_allocate_port();
	if (!gp) {
		printk(KERN_ERR "via82xx: cannot allocate memory for gameport\n");
		release_resource(r);
		kfree_nocheck(r);
		return -ENOMEM;
	}

	gameport_set_name(gp, "VIA686 Gameport");
	gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
	gameport_set_dev_parent(gp, &chip->pci->dev);
	gp->io = JOYSTICK_ADDR;
	gameport_set_port_data(gp, r);

	/* Enable legacy joystick port */
	*legacy |= VIA_FUNC_ENABLE_GAME;
	pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, *legacy);

	gameport_register_port(chip->gameport);

	return 0;
}

static void snd_via686_free_gameport(via82xx_t *chip)
{
	if (chip->gameport) {
		struct resource *r = gameport_get_port_data(chip->gameport);

		gameport_unregister_port(chip->gameport);
		chip->gameport = NULL;
		release_resource(r);
		kfree_nocheck(r);
	}
}
#else
static inline int snd_via686_create_gameport(via82xx_t *chip, int dev, unsigned char *legacy)
{
	return -ENOSYS;
}
static inline void snd_via686_free_gameport(via82xx_t *chip) { }
#endif


/*
 *
 */

static int __devinit snd_via8233_init_misc(via82xx_t *chip, int dev)
{
	int i, err, caps;
	unsigned char val;

	caps = chip->chip_type == TYPE_VIA8233A ? 1 : 2;
	for (i = 0; i < caps; i++) {
		snd_via8233_capture_source.index = i;
		err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_capture_source, chip));
		if (err < 0)
			return err;
	}
	if (ac97_can_spdif(chip->ac97)) {
		err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_dxs3_spdif_control, chip));
		if (err < 0)
			return err;
	}
	if (chip->chip_type != TYPE_VIA8233A) {
		/* when no h/w PCM volume control is found, use DXS volume control
		 * as the PCM vol control
		 */
		snd_ctl_elem_id_t sid;
		memset(&sid, 0, sizeof(sid));
		strcpy(sid.name, "PCM Playback Volume");
		sid.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
		if (! snd_ctl_find_id(chip->card, &sid)) {
			err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_dxs_volume_control, chip));
			if (err < 0)
				return err;
		}
	}

	/* select spdif data slot 10/11 */
	pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &val);
	val = (val & ~VIA8233_SPDIF_SLOT_MASK) | VIA8233_SPDIF_SLOT_1011;
	val &= ~VIA8233_SPDIF_DX3; /* SPDIF off as default */
	pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, val);

	return 0;
}

static int __devinit snd_via686_init_misc(via82xx_t *chip, int dev)
{
	unsigned char legacy, legacy_cfg;
	int rev_h = 0;

	legacy = chip->old_legacy;
	legacy_cfg = chip->old_legacy_cfg;
	legacy |= VIA_FUNC_MIDI_IRQMASK;	/* FIXME: correct? (disable MIDI) */
	legacy &= ~VIA_FUNC_ENABLE_GAME;	/* disable joystick */
	if (chip->revision >= VIA_REV_686_H) {
		rev_h = 1;
		if (mpu_port[dev] >= 0x200) {	/* force MIDI */
			mpu_port[dev] &= 0xfffc;
			pci_write_config_dword(chip->pci, 0x18, mpu_port[dev] | 0x01);
#ifdef CONFIG_PM
			chip->mpu_port_saved = mpu_port[dev];
#endif
		} else {
			mpu_port[dev] = pci_resource_start(chip->pci, 2);
		}
	} else {
		switch (mpu_port[dev]) {	/* force MIDI */
		case 0x300:
		case 0x310:
		case 0x320:
		case 0x330:
			legacy_cfg &= ~(3 << 2);
			legacy_cfg |= (mpu_port[dev] & 0x0030) >> 2;
			break;
		default:			/* no, use BIOS settings */
			if (legacy & VIA_FUNC_ENABLE_MIDI)
				mpu_port[dev] = 0x300 + ((legacy_cfg & 0x000c) << 2);
			break;
		}
	}
	if (mpu_port[dev] >= 0x200 &&
	    (chip->mpu_res = request_region(mpu_port[dev], 2, "VIA82xx MPU401")) != NULL) {
		if (rev_h)
			legacy |= VIA_FUNC_MIDI_PNP;	/* enable PCI I/O 2 */
		legacy |= VIA_FUNC_ENABLE_MIDI;
	} else {
		if (rev_h)
			legacy &= ~VIA_FUNC_MIDI_PNP;	/* disable PCI I/O 2 */
		legacy &= ~VIA_FUNC_ENABLE_MIDI;
		mpu_port[dev] = 0;
	}

	pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, legacy);
	pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, legacy_cfg);
	if (chip->mpu_res) {
		if (snd_mpu401_uart_new(chip->card, 0, MPU401_HW_VIA686A,
					mpu_port[dev], 1,
					chip->irq, 0, &chip->rmidi) < 0) {
			printk(KERN_WARNING "unable to initialize MPU-401 at 0x%lx, skipping\n", mpu_port[dev]);
			legacy &= ~VIA_FUNC_ENABLE_MIDI;
		} else {
			legacy &= ~VIA_FUNC_MIDI_IRQMASK;	/* enable MIDI interrupt */
		}
		pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, legacy);
	}

	snd_via686_create_gameport(chip, dev, &legacy);

#ifdef CONFIG_PM
	chip->legacy_saved = legacy;
	chip->legacy_cfg_saved = legacy_cfg;
#endif

	return 0;
}


/*
 * proc interface
 */
static void snd_via82xx_proc_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
	via82xx_t *chip = entry->private_data;
	int i;
	
	snd_iprintf(buffer, "%s\n\n", chip->card->longname);
	for (i = 0; i < 0xa0; i += 4) {
		snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
	}
}

static void __devinit snd_via82xx_proc_init(via82xx_t *chip)
{
	snd_info_entry_t *entry;

	if (! snd_card_proc_new(chip->card, "via82xx", &entry))
		snd_info_set_text_ops(entry, chip, 1024, snd_via82xx_proc_read);
}

/*
 *
 */

static int snd_via82xx_chip_init(via82xx_t *chip)
{
	unsigned int val;
	unsigned long end_time;
	unsigned char pval;

#if 0 /* broken on K7M? */
	if (chip->chip_type == TYPE_VIA686)
		/* disable all legacy ports */
		pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, 0);
#endif
	pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
	if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
		/* deassert ACLink reset, force SYNC */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
				      VIA_ACLINK_CTRL_ENABLE |
				      VIA_ACLINK_CTRL_RESET |
				      VIA_ACLINK_CTRL_SYNC);
		udelay(100);
#if 1 /* FIXME: should we do full reset here for all chip models? */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
		udelay(100);
#else
		/* deassert ACLink reset, force SYNC (warm AC'97 reset) */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
				      VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
		udelay(2);
#endif
		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
		/* note - FM data out has trouble with non VRA codecs !! */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
		udelay(100);
	}
	
	/* Make sure VRA is enabled, in case we didn't do a
	 * complete codec reset, above */
	pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
	if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
		/* note - FM data out has trouble with non VRA codecs !! */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
		udelay(100);
	}

	/* wait until codec ready */
	end_time = jiffies + msecs_to_jiffies(750);
	do {
		pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
		if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
			break;
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(1);
	} while (time_before(jiffies, end_time));

	if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
		snd_printk("AC'97 codec is not ready [0x%x]\n", val);

#if 0 /* FIXME: we don't support the second codec yet so skip the detection now.. */
	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
				 VIA_REG_AC97_SECONDARY_VALID |
				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
	end_time = jiffies + msecs_to_jiffies(750);
	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
				 VIA_REG_AC97_SECONDARY_VALID |
				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
	do {
		if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
			chip->ac97_secondary = 1;
			goto __ac97_ok2;
		}
		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(1);
	} while (time_before(jiffies, end_time));
	/* This is ok, the most of motherboards have only one codec */

      __ac97_ok2:
#endif

	if (chip->chip_type == TYPE_VIA686) {
		/* route FM trap to IRQ, disable FM trap */
		pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
		/* disable all GPI interrupts */
		outl(0, VIAREG(chip, GPI_INTR));
	}

	if (chip->chip_type != TYPE_VIA686) {
		/* Workaround for Award BIOS bug:
		 * DXS channels don't work properly with VRA if MC97 is disabled.
		 */
		struct pci_dev *pci;
		pci = pci_get_device(0x1106, 0x3068, NULL); /* MC97 */
		if (pci) {
			unsigned char data;
			pci_read_config_byte(pci, 0x44, &data);
			pci_write_config_byte(pci, 0x44, data | 0x40);
			pci_dev_put(pci);
		}
	}

	if (chip->chip_type != TYPE_VIA8233A) {
		int i, idx;
		for (idx = 0; idx < 4; idx++) {
			unsigned long port = chip->port + 0x10 * idx;
			for (i = 0; i < 2; i++)
				outb(chip->playback_volume[i], port + VIA_REG_OFS_PLAYBACK_VOLUME_L + i);
		}
	}

	return 0;
}

#ifdef CONFIG_PM
/*
 * power management
 */
static int snd_via82xx_suspend(snd_card_t *card, pm_message_t state)
{
	via82xx_t *chip = card->pm_private_data;
	int i;

	for (i = 0; i < 2; i++)
		if (chip->pcms[i])
			snd_pcm_suspend_all(chip->pcms[i]);
	for (i = 0; i < chip->num_devs; i++)
		snd_via82xx_channel_reset(chip, &chip->devs[i]);
	synchronize_irq(chip->irq);
	snd_ac97_suspend(chip->ac97);

	/* save misc values */
	if (chip->chip_type != TYPE_VIA686) {
		pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &chip->spdif_ctrl_saved);
		chip->capture_src_saved[0] = inb(chip->port + VIA_REG_CAPTURE_CHANNEL);
		chip->capture_src_saved[1] = inb(chip->port + VIA_REG_CAPTURE_CHANNEL + 0x10);
	}

	pci_set_power_state(chip->pci, 3);
	pci_disable_device(chip->pci);
	return 0;
}

static int snd_via82xx_resume(snd_card_t *card)
{
	via82xx_t *chip = card->pm_private_data;
	int i;

	pci_enable_device(chip->pci);
	pci_set_power_state(chip->pci, 0);

	snd_via82xx_chip_init(chip);

	if (chip->chip_type == TYPE_VIA686) {
		if (chip->mpu_port_saved)
			pci_write_config_dword(chip->pci, 0x18, chip->mpu_port_saved | 0x01);
		pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, chip->legacy_saved);
		pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, chip->legacy_cfg_saved);
	} else {
		pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, chip->spdif_ctrl_saved);
		outb(chip->capture_src_saved[0], chip->port + VIA_REG_CAPTURE_CHANNEL);
		outb(chip->capture_src_saved[1], chip->port + VIA_REG_CAPTURE_CHANNEL + 0x10);
	}

	snd_ac97_resume(chip->ac97);

	for (i = 0; i < chip->num_devs; i++)
		snd_via82xx_channel_reset(chip, &chip->devs[i]);

	return 0;
}
#endif /* CONFIG_PM */

static int snd_via82xx_free(via82xx_t *chip)
{
	unsigned int i;

	if (chip->irq < 0)
		goto __end_hw;
	/* disable interrupts */
	for (i = 0; i < chip->num_devs; i++)
		snd_via82xx_channel_reset(chip, &chip->devs[i]);
	synchronize_irq(chip->irq);
      __end_hw:
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *)chip);
	if (chip->mpu_res) {
		release_resource(chip->mpu_res);
		kfree_nocheck(chip->mpu_res);
	}
	pci_release_regions(chip->pci);

	if (chip->chip_type == TYPE_VIA686) {
		snd_via686_free_gameport(chip);
		pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, chip->old_legacy);
		pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, chip->old_legacy_cfg);
	}
	pci_disable_device(chip->pci);
	kfree(chip);
	return 0;
}

static int snd_via82xx_dev_free(snd_device_t *device)
{
	via82xx_t *chip = device->device_data;
	return snd_via82xx_free(chip);
}

static int __devinit snd_via82xx_create(snd_card_t * card,
					struct pci_dev *pci,
					int chip_type,
					int revision,
					unsigned int ac97_clock,
					via82xx_t ** r_via)
{
	via82xx_t *chip;
	int err;
        static snd_device_ops_t ops = {
		.dev_free =	snd_via82xx_dev_free,
        };

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

	if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
		pci_disable_device(pci);
		return -ENOMEM;
	}

	chip->chip_type = chip_type;
	chip->revision = revision;

	spin_lock_init(&chip->reg_lock);
	spin_lock_init(&chip->rates[0].lock);
	spin_lock_init(&chip->rates[1].lock);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	pci_read_config_byte(pci, VIA_FUNC_ENABLE, &chip->old_legacy);
	pci_read_config_byte(pci, VIA_PNP_CONTROL, &chip->old_legacy_cfg);
	pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE,
			      chip->old_legacy & ~(VIA_FUNC_ENABLE_SB|VIA_FUNC_ENABLE_FM));

	if ((err = pci_request_regions(pci, card->driver)) < 0) {
		kfree(chip);
		pci_disable_device(pci);
		return err;
	}
	chip->port = pci_resource_start(pci, 0);
	if (request_irq(pci->irq, snd_via82xx_interrupt, SA_INTERRUPT|SA_SHIRQ,
			card->driver, (void *)chip)) {
		snd_printk("unable to grab IRQ %d\n", pci->irq);
		snd_via82xx_free(chip);
		return -EBUSY;
	}
	chip->irq = pci->irq;
	if (ac97_clock >= 8000 && ac97_clock <= 48000)
		chip->ac97_clock = ac97_clock;
	synchronize_irq(chip->irq);

	if ((err = snd_via82xx_chip_init(chip)) < 0) {
		snd_via82xx_free(chip);
		return err;
	}

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_via82xx_free(chip);
		return err;
	}

	/* The 8233 ac97 controller does not implement the master bit
	 * in the pci command register. IMHO this is a violation of the PCI spec.
	 * We call pci_set_master here because it does not hurt. */
	pci_set_master(pci);

	snd_card_set_dev(card, &pci->dev);

	*r_via = chip;
	return 0;
}

struct via823x_info {
	int revision;
	char *name;
	int type;
};
static struct via823x_info via823x_cards[] __devinitdata = {
	{ VIA_REV_PRE_8233, "VIA 8233-Pre", TYPE_VIA8233 },
	{ VIA_REV_8233C, "VIA 8233C", TYPE_VIA8233 },
	{ VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
	{ VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
	{ VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
	{ VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
};

/*
 * auto detection of DXS channel supports.
 */
struct dxs_whitelist {
	unsigned short subvendor;
	unsigned short subdevice; 
	unsigned short mask; 
	short action;	/* new dxs_support value */
};

static int __devinit check_dxs_list(struct pci_dev *pci)
{
	static struct dxs_whitelist whitelist[] = {
		{ .subvendor = 0x1005, .subdevice = 0x4710, .action = VIA_DXS_ENABLE }, /* Avance Logic Mobo */
		{ .subvendor = 0x1019, .subdevice = 0x0996, .action = VIA_DXS_48K },
		{ .subvendor = 0x1019, .subdevice = 0x0a81, .action = VIA_DXS_NO_VRA }, /* ECS K7VTA3 v8.0 */
		{ .subvendor = 0x1019, .subdevice = 0x0a85, .action = VIA_DXS_NO_VRA }, /* ECS L7VMM2 */
		{ .subvendor = 0x1019, .subdevice = 0xa101, .action = VIA_DXS_SRC },
		{ .subvendor = 0x1025, .subdevice = 0x0033, .action = VIA_DXS_NO_VRA }, /* Acer Inspire 1353LM */
		{ .subvendor = 0x1025, .subdevice = 0x0046, .action = VIA_DXS_SRC }, /* Acer Aspire 1524 WLMi */
		{ .subvendor = 0x1043, .subdevice = 0x8095, .action = VIA_DXS_NO_VRA }, /* ASUS A7V8X (FIXME: possibly VIA_DXS_ENABLE?)*/
		{ .subvendor = 0x1043, .subdevice = 0x80a1, .action = VIA_DXS_NO_VRA }, /* ASUS A7V8-X */
		{ .subvendor = 0x1043, .subdevice = 0x80b0, .action = VIA_DXS_NO_VRA }, /* ASUS A7V600 & K8V*/ 
		{ .subvendor = 0x1043, .subdevice = 0x810d, .action = VIA_DXS_SRC }, /* ASUS */
		{ .subvendor = 0x1043, .subdevice = 0x812a, .action = VIA_DXS_SRC    }, /* ASUS A8V Deluxe */ 
		{ .subvendor = 0x1071, .subdevice = 0x8375, .action = VIA_DXS_NO_VRA }, /* Vobis/Yakumo/Mitac notebook */
		{ .subvendor = 0x1071, .subdevice = 0x8399, .action = VIA_DXS_NO_VRA }, /* Umax AB 595T (VIA K8N800A - VT8237) */
		{ .subvendor = 0x10cf, .subdevice = 0x118e, .action = VIA_DXS_ENABLE }, /* FSC laptop */
		{ .subvendor = 0x1106, .subdevice = 0x4161, .action = VIA_DXS_NO_VRA }, /* ASRock K7VT2 */
		{ .subvendor = 0x1106, .subdevice = 0x4552, .action = VIA_DXS_NO_VRA }, /* QDI Kudoz 7X/600-6AL */
		{ .subvendor = 0x1106, .subdevice = 0xaa01, .action = VIA_DXS_NO_VRA }, /* EPIA MII */
		{ .subvendor = 0x1106, .subdevice = 0xc001, .action = VIA_DXS_SRC }, /* Insight P4-ITX */
		{ .subvendor = 0x1297, .subdevice = 0xa232, .action = VIA_DXS_ENABLE }, /* Shuttle ?? */
		{ .subvendor = 0x1297, .subdevice = 0xc160, .action = VIA_DXS_ENABLE }, /* Shuttle SK41G */
		{ .subvendor = 0x1458, .subdevice = 0xa002, .action = VIA_DXS_ENABLE }, /* Gigabyte GA-7VAXP */
		{ .subvendor = 0x1462, .subdevice = 0x0080, .action = VIA_DXS_SRC }, /* MSI K8T Neo-FIS2R */
		{ .subvendor = 0x1462, .subdevice = 0x0430, .action = VIA_DXS_SRC }, /* MSI 7142 (K8MM-V) */
		{ .subvendor = 0x1462, .subdevice = 0x3800, .action = VIA_DXS_ENABLE }, /* MSI KT266 */
		{ .subvendor = 0x1462, .subdevice = 0x5901, .action = VIA_DXS_NO_VRA }, /* MSI KT6 Delta-SR */
		{ .subvendor = 0x1462, .subdevice = 0x7023, .action = VIA_DXS_NO_VRA }, /* MSI K8T Neo2-FI */
		{ .subvendor = 0x1462, .subdevice = 0x7120, .action = VIA_DXS_ENABLE }, /* MSI KT4V */
		{ .subvendor = 0x1462, .subdevice = 0x7142, .action = VIA_DXS_ENABLE }, /* MSI K8MM-V */
		{ .subvendor = 0x147b, .subdevice = 0x1401, .action = VIA_DXS_ENABLE }, /* ABIT KD7(-RAID) */
		{ .subvendor = 0x147b, .subdevice = 0x1411, .action = VIA_DXS_ENABLE }, /* ABIT VA-20 */
		{ .subvendor = 0x147b, .subdevice = 0x1413, .action = VIA_DXS_ENABLE }, /* ABIT KV8 Pro */
		{ .subvendor = 0x147b, .subdevice = 0x1415, .action = VIA_DXS_NO_VRA }, /* Abit AV8 */
		{ .subvendor = 0x14ff, .subdevice = 0x0403, .action = VIA_DXS_ENABLE }, /* Twinhead mobo */
		{ .subvendor = 0x14ff, .subdevice = 0x0408, .action = VIA_DXS_SRC }, /* Twinhead laptop */
		{ .subvendor = 0x1584, .subdevice = 0x8120, .action = VIA_DXS_ENABLE }, /* Gericom/Targa/Vobis/Uniwill laptop */
		{ .subvendor = 0x1584, .subdevice = 0x8123, .action = VIA_DXS_NO_VRA }, /* Uniwill (Targa Visionary XP-210) */
		{ .subvendor = 0x161f, .subdevice = 0x202b, .action = VIA_DXS_NO_VRA }, /* Amira Note book */
		{ .subvendor = 0x161f, .subdevice = 0x2032, .action = VIA_DXS_48K }, /* m680x machines */
		{ .subvendor = 0x1631, .subdevice = 0xe004, .action = VIA_DXS_ENABLE }, /* Easy Note 3174, Packard Bell */
		{ .subvendor = 0x1695, .subdevice = 0x3005, .action = VIA_DXS_ENABLE }, /* EPoX EP-8K9A */
		{ .subvendor = 0x1849, .subdevice = 0x3059, .action = VIA_DXS_NO_VRA }, /* ASRock K7VM2 */
		{ .subvendor = 0x1919, .subdevice = 0x200a, .action = VIA_DXS_NO_VRA }, /* Soltek SL-K8Tpro-939 */
		{ .subvendor = 0x4005, .subdevice = 0x4710, .action = VIA_DXS_SRC },	/* MSI K7T266 Pro2 (MS-6380 V2.0) BIOS 3.7 */
		{ } /* terminator */
	};
	struct dxs_whitelist *w;
	unsigned short subsystem_vendor;
	unsigned short subsystem_device;

	pci_read_config_word(pci, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vendor);
	pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &subsystem_device);

	for (w = whitelist; w->subvendor; w++) {
		if (w->subvendor != subsystem_vendor)
			continue;
		if (w->mask) {
			if ((w->mask & subsystem_device) == w->subdevice)
				return w->action;
		} else {
			if (subsystem_device == w->subdevice)
				return w->action;
		}
	}

	/*
	 * not detected, try 48k rate only to be sure.
	 */
	printk(KERN_INFO "via82xx: Assuming DXS channels with 48k fixed sample rate.\n");
	printk(KERN_INFO "         Please try dxs_support=5 option\n");
	printk(KERN_INFO "         and report if it works on your machine.\n");
	printk(KERN_INFO "         For more details, read ALSA-Configuration.txt.\n");
	return VIA_DXS_48K;
};

static int __devinit snd_via82xx_probe(struct pci_dev *pci,
				       const struct pci_device_id *pci_id)
{
	static int dev;
	snd_card_t *card;
	via82xx_t *chip;
	unsigned char revision;
	int chip_type = 0, card_type;
	unsigned int i;
	int err;

	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
	if (card == NULL)
		return -ENOMEM;

	card_type = pci_id->driver_data;
	pci_read_config_byte(pci, PCI_REVISION_ID, &revision);
	switch (card_type) {
	case TYPE_CARD_VIA686:
		strcpy(card->driver, "VIA686A");
		sprintf(card->shortname, "VIA 82C686A/B rev%x", revision);
		chip_type = TYPE_VIA686;
		break;
	case TYPE_CARD_VIA8233:
		chip_type = TYPE_VIA8233;
		sprintf(card->shortname, "VIA 823x rev%x", revision);
		for (i = 0; i < ARRAY_SIZE(via823x_cards); i++) {
			if (revision == via823x_cards[i].revision) {
				chip_type = via823x_cards[i].type;
				strcpy(card->shortname, via823x_cards[i].name);
				break;
			}
		}
		if (chip_type != TYPE_VIA8233A) {
			if (dxs_support[dev] == VIA_DXS_AUTO)
				dxs_support[dev] = check_dxs_list(pci);
			/* force to use VIA8233 or 8233A model according to
			 * dxs_support module option
			 */
			if (dxs_support[dev] == VIA_DXS_DISABLE)
				chip_type = TYPE_VIA8233A;
			else
				chip_type = TYPE_VIA8233;
		}
		if (chip_type == TYPE_VIA8233A)
			strcpy(card->driver, "VIA8233A");
		else if (revision >= VIA_REV_8237)
			strcpy(card->driver, "VIA8237"); /* no slog assignment */
		else
			strcpy(card->driver, "VIA8233");
		break;
	default:
		snd_printk(KERN_ERR "invalid card type %d\n", card_type);
		err = -EINVAL;
		goto __error;
	}
		
	if ((err = snd_via82xx_create(card, pci, chip_type, revision, ac97_clock[dev], &chip)) < 0)
		goto __error;
	if ((err = snd_via82xx_mixer_new(chip, ac97_quirk[dev])) < 0)
		goto __error;

	if (chip_type == TYPE_VIA686) {
		if ((err = snd_via686_pcm_new(chip)) < 0 ||
		    (err = snd_via686_init_misc(chip, dev)) < 0)
			goto __error;
	} else {
		if (chip_type == TYPE_VIA8233A) {
			if ((err = snd_via8233a_pcm_new(chip)) < 0)
				goto __error;
			// chip->dxs_fixed = 1; /* FIXME: use 48k for DXS #3? */
		} else {
			if ((err = snd_via8233_pcm_new(chip)) < 0)
				goto __error;
			if (dxs_support[dev] == VIA_DXS_48K)
				chip->dxs_fixed = 1;
			else if (dxs_support[dev] == VIA_DXS_NO_VRA)
				chip->no_vra = 1;
			else if (dxs_support[dev] == VIA_DXS_SRC) {
				chip->no_vra = 1;
				chip->dxs_src = 1;
			}
		}
		if ((err = snd_via8233_init_misc(chip, dev)) < 0)
			goto __error;
	}

	snd_card_set_pm_callback(card, snd_via82xx_suspend, snd_via82xx_resume, chip);

	/* disable interrupts */
	for (i = 0; i < chip->num_devs; i++)
		snd_via82xx_channel_reset(chip, &chip->devs[i]);

	snprintf(card->longname, sizeof(card->longname),
		 "%s with %s at %#lx, irq %d", card->shortname,
		 snd_ac97_get_short_name(chip->ac97), chip->port, chip->irq);

	snd_via82xx_proc_init(chip);

	if ((err = snd_card_register(card)) < 0) {
		snd_card_free(card);
		return err;
	}
	pci_set_drvdata(pci, card);
	dev++;
	return 0;

 __error:
	snd_card_free(card);
	return err;
}

static void __devexit snd_via82xx_remove(struct pci_dev *pci)
{
	snd_card_free(pci_get_drvdata(pci));
	pci_set_drvdata(pci, NULL);
}

static struct pci_driver driver = {
	.name = "VIA 82xx Audio",
	.owner = THIS_MODULE,
	.id_table = snd_via82xx_ids,
	.probe = snd_via82xx_probe,
	.remove = __devexit_p(snd_via82xx_remove),
	SND_PCI_PM_CALLBACKS
};

static int __init alsa_card_via82xx_init(void)
{
	return pci_register_driver(&driver);
}

static void __exit alsa_card_via82xx_exit(void)
{
	pci_unregister_driver(&driver);
}

module_init(alsa_card_via82xx_init)
module_exit(alsa_card_via82xx_exit)