summaryrefslogtreecommitdiff
path: root/sound/pci/es1938.c
blob: ec598ba1a8833fa982ac5db8b87aa9dd5601caf1 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for ESS Solo-1 (ES1938, ES1946, ES1969) soundcard
 *  Copyright (c) by Jaromir Koutek <miri@punknet.cz>,
 *                   Jaroslav Kysela <perex@perex.cz>,
 *                   Thomas Sailer <sailer@ife.ee.ethz.ch>,
 *                   Abramo Bagnara <abramo@alsa-project.org>,
 *                   Markus Gruber <gruber@eikon.tum.de>
 * 
 * Rewritten from sonicvibes.c source.
 *
 *  TODO:
 *    Rewrite better spinlocks
 */

/*
  NOTES:
  - Capture data is written unaligned starting from dma_base + 1 so I need to
    disable mmap and to add a copy callback.
  - After several cycle of the following:
    while : ; do arecord -d1 -f cd -t raw | aplay -f cd ; done
    a "playback write error (DMA or IRQ trouble?)" may happen.
    This is due to playback interrupts not generated.
    I suspect a timing issue.
  - Sometimes the interrupt handler is invoked wrongly during playback.
    This generates some harmless "Unexpected hw_pointer: wrong interrupt
    acknowledge".
    I've seen that using small period sizes.
    Reproducible with:
    mpg123 test.mp3 &
    hdparm -t -T /dev/hda
*/


#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/opl3.h>
#include <sound/mpu401.h>
#include <sound/initval.h>
#include <sound/tlv.h>

MODULE_AUTHOR("Jaromir Koutek <miri@punknet.cz>");
MODULE_DESCRIPTION("ESS Solo-1");
MODULE_LICENSE("GPL");

#if IS_REACHABLE(CONFIG_GAMEPORT)
#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 bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for ESS Solo-1 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for ESS Solo-1 soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable ESS Solo-1 soundcard.");

#define SLIO_REG(chip, x) ((chip)->io_port + ESSIO_REG_##x)

#define SLDM_REG(chip, x) ((chip)->ddma_port + ESSDM_REG_##x)

#define SLSB_REG(chip, x) ((chip)->sb_port + ESSSB_REG_##x)

#define SL_PCI_LEGACYCONTROL		0x40
#define SL_PCI_CONFIG			0x50
#define SL_PCI_DDMACONTROL		0x60

#define ESSIO_REG_AUDIO2DMAADDR		0
#define ESSIO_REG_AUDIO2DMACOUNT	4
#define ESSIO_REG_AUDIO2MODE		6
#define ESSIO_REG_IRQCONTROL		7

#define ESSDM_REG_DMAADDR		0x00
#define ESSDM_REG_DMACOUNT		0x04
#define ESSDM_REG_DMACOMMAND		0x08
#define ESSDM_REG_DMASTATUS		0x08
#define ESSDM_REG_DMAMODE		0x0b
#define ESSDM_REG_DMACLEAR		0x0d
#define ESSDM_REG_DMAMASK		0x0f

#define ESSSB_REG_FMLOWADDR		0x00
#define ESSSB_REG_FMHIGHADDR		0x02
#define ESSSB_REG_MIXERADDR		0x04
#define ESSSB_REG_MIXERDATA		0x05

#define ESSSB_IREG_AUDIO1		0x14
#define ESSSB_IREG_MICMIX		0x1a
#define ESSSB_IREG_RECSRC		0x1c
#define ESSSB_IREG_MASTER		0x32
#define ESSSB_IREG_FM			0x36
#define ESSSB_IREG_AUXACD		0x38
#define ESSSB_IREG_AUXB			0x3a
#define ESSSB_IREG_PCSPEAKER		0x3c
#define ESSSB_IREG_LINE			0x3e
#define ESSSB_IREG_SPATCONTROL		0x50
#define ESSSB_IREG_SPATLEVEL		0x52
#define ESSSB_IREG_MASTER_LEFT		0x60
#define ESSSB_IREG_MASTER_RIGHT		0x62
#define ESSSB_IREG_MPU401CONTROL	0x64
#define ESSSB_IREG_MICMIXRECORD		0x68
#define ESSSB_IREG_AUDIO2RECORD		0x69
#define ESSSB_IREG_AUXACDRECORD		0x6a
#define ESSSB_IREG_FMRECORD		0x6b
#define ESSSB_IREG_AUXBRECORD		0x6c
#define ESSSB_IREG_MONO			0x6d
#define ESSSB_IREG_LINERECORD		0x6e
#define ESSSB_IREG_MONORECORD		0x6f
#define ESSSB_IREG_AUDIO2SAMPLE		0x70
#define ESSSB_IREG_AUDIO2MODE		0x71
#define ESSSB_IREG_AUDIO2FILTER		0x72
#define ESSSB_IREG_AUDIO2TCOUNTL	0x74
#define ESSSB_IREG_AUDIO2TCOUNTH	0x76
#define ESSSB_IREG_AUDIO2CONTROL1	0x78
#define ESSSB_IREG_AUDIO2CONTROL2	0x7a
#define ESSSB_IREG_AUDIO2		0x7c

#define ESSSB_REG_RESET			0x06

#define ESSSB_REG_READDATA		0x0a
#define ESSSB_REG_WRITEDATA		0x0c
#define ESSSB_REG_READSTATUS		0x0c

#define ESSSB_REG_STATUS		0x0e

#define ESS_CMD_EXTSAMPLERATE		0xa1
#define ESS_CMD_FILTERDIV		0xa2
#define ESS_CMD_DMACNTRELOADL		0xa4
#define ESS_CMD_DMACNTRELOADH		0xa5
#define ESS_CMD_ANALOGCONTROL		0xa8
#define ESS_CMD_IRQCONTROL		0xb1
#define ESS_CMD_DRQCONTROL		0xb2
#define ESS_CMD_RECLEVEL		0xb4
#define ESS_CMD_SETFORMAT		0xb6
#define ESS_CMD_SETFORMAT2		0xb7
#define ESS_CMD_DMACONTROL		0xb8
#define ESS_CMD_DMATYPE			0xb9
#define ESS_CMD_OFFSETLEFT		0xba	
#define ESS_CMD_OFFSETRIGHT		0xbb
#define ESS_CMD_READREG			0xc0
#define ESS_CMD_ENABLEEXT		0xc6
#define ESS_CMD_PAUSEDMA		0xd0
#define ESS_CMD_ENABLEAUDIO1		0xd1
#define ESS_CMD_STOPAUDIO1		0xd3
#define ESS_CMD_AUDIO1STATUS		0xd8
#define ESS_CMD_CONTDMA			0xd4
#define ESS_CMD_TESTIRQ			0xf2

#define ESS_RECSRC_MIC		0
#define ESS_RECSRC_AUXACD	2
#define ESS_RECSRC_AUXB		5
#define ESS_RECSRC_LINE		6
#define ESS_RECSRC_NONE		7

#define DAC1 0x01
#define ADC1 0x02
#define DAC2 0x04

/*

 */

#define SAVED_REG_SIZE	32 /* max. number of registers to save */

struct es1938 {
	int irq;

	unsigned long io_port;
	unsigned long sb_port;
	unsigned long vc_port;
	unsigned long mpu_port;
	unsigned long game_port;
	unsigned long ddma_port;

	unsigned char irqmask;
	unsigned char revision;

	struct snd_kcontrol *hw_volume;
	struct snd_kcontrol *hw_switch;
	struct snd_kcontrol *master_volume;
	struct snd_kcontrol *master_switch;

	struct pci_dev *pci;
	struct snd_card *card;
	struct snd_pcm *pcm;
	struct snd_pcm_substream *capture_substream;
	struct snd_pcm_substream *playback1_substream;
	struct snd_pcm_substream *playback2_substream;
	struct snd_rawmidi *rmidi;

	unsigned int dma1_size;
	unsigned int dma2_size;
	unsigned int dma1_start;
	unsigned int dma2_start;
	unsigned int dma1_shift;
	unsigned int dma2_shift;
	unsigned int last_capture_dmaaddr;
	unsigned int active;

	spinlock_t reg_lock;
	spinlock_t mixer_lock;
        struct snd_info_entry *proc_entry;

#ifdef SUPPORT_JOYSTICK
	struct gameport *gameport;
#endif
#ifdef CONFIG_PM_SLEEP
	unsigned char saved_regs[SAVED_REG_SIZE];
#endif
};

static irqreturn_t snd_es1938_interrupt(int irq, void *dev_id);

static const struct pci_device_id snd_es1938_ids[] = {
	{ PCI_VDEVICE(ESS, 0x1969), 0, },   /* Solo-1 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_es1938_ids);

#define RESET_LOOP_TIMEOUT	0x10000
#define WRITE_LOOP_TIMEOUT	0x10000
#define GET_LOOP_TIMEOUT	0x01000

/* -----------------------------------------------------------------
 * Write to a mixer register
 * -----------------------------------------------------------------*/
static void snd_es1938_mixer_write(struct es1938 *chip, unsigned char reg, unsigned char val)
{
	unsigned long flags;
	spin_lock_irqsave(&chip->mixer_lock, flags);
	outb(reg, SLSB_REG(chip, MIXERADDR));
	outb(val, SLSB_REG(chip, MIXERDATA));
	spin_unlock_irqrestore(&chip->mixer_lock, flags);
	dev_dbg(chip->card->dev, "Mixer reg %02x set to %02x\n", reg, val);
}

/* -----------------------------------------------------------------
 * Read from a mixer register
 * -----------------------------------------------------------------*/
static int snd_es1938_mixer_read(struct es1938 *chip, unsigned char reg)
{
	int data;
	unsigned long flags;
	spin_lock_irqsave(&chip->mixer_lock, flags);
	outb(reg, SLSB_REG(chip, MIXERADDR));
	data = inb(SLSB_REG(chip, MIXERDATA));
	spin_unlock_irqrestore(&chip->mixer_lock, flags);
	dev_dbg(chip->card->dev, "Mixer reg %02x now is %02x\n", reg, data);
	return data;
}

/* -----------------------------------------------------------------
 * Write to some bits of a mixer register (return old value)
 * -----------------------------------------------------------------*/
static int snd_es1938_mixer_bits(struct es1938 *chip, unsigned char reg,
				 unsigned char mask, unsigned char val)
{
	unsigned long flags;
	unsigned char old, new, oval;
	spin_lock_irqsave(&chip->mixer_lock, flags);
	outb(reg, SLSB_REG(chip, MIXERADDR));
	old = inb(SLSB_REG(chip, MIXERDATA));
	oval = old & mask;
	if (val != oval) {
		new = (old & ~mask) | (val & mask);
		outb(new, SLSB_REG(chip, MIXERDATA));
		dev_dbg(chip->card->dev,
			"Mixer reg %02x was %02x, set to %02x\n",
			   reg, old, new);
	}
	spin_unlock_irqrestore(&chip->mixer_lock, flags);
	return oval;
}

/* -----------------------------------------------------------------
 * Write command to Controller Registers
 * -----------------------------------------------------------------*/
static void snd_es1938_write_cmd(struct es1938 *chip, unsigned char cmd)
{
	int i;
	unsigned char v;
	for (i = 0; i < WRITE_LOOP_TIMEOUT; i++) {
		v = inb(SLSB_REG(chip, READSTATUS));
		if (!(v & 0x80)) {
			outb(cmd, SLSB_REG(chip, WRITEDATA));
			return;
		}
	}
	dev_err(chip->card->dev,
		"snd_es1938_write_cmd timeout (0x02%x/0x02%x)\n", cmd, v);
}

/* -----------------------------------------------------------------
 * Read the Read Data Buffer
 * -----------------------------------------------------------------*/
static int snd_es1938_get_byte(struct es1938 *chip)
{
	int i;
	unsigned char v;
	for (i = GET_LOOP_TIMEOUT; i; i--) {
		v = inb(SLSB_REG(chip, STATUS));
		if (v & 0x80)
			return inb(SLSB_REG(chip, READDATA));
	}
	dev_err(chip->card->dev, "get_byte timeout: status 0x02%x\n", v);
	return -ENODEV;
}

/* -----------------------------------------------------------------
 * Write value cmd register
 * -----------------------------------------------------------------*/
static void snd_es1938_write(struct es1938 *chip, unsigned char reg, unsigned char val)
{
	unsigned long flags;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1938_write_cmd(chip, reg);
	snd_es1938_write_cmd(chip, val);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	dev_dbg(chip->card->dev, "Reg %02x set to %02x\n", reg, val);
}

/* -----------------------------------------------------------------
 * Read data from cmd register and return it
 * -----------------------------------------------------------------*/
static unsigned char snd_es1938_read(struct es1938 *chip, unsigned char reg)
{
	unsigned char val;
	unsigned long flags;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1938_write_cmd(chip, ESS_CMD_READREG);
	snd_es1938_write_cmd(chip, reg);
	val = snd_es1938_get_byte(chip);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	dev_dbg(chip->card->dev, "Reg %02x now is %02x\n", reg, val);
	return val;
}

/* -----------------------------------------------------------------
 * Write data to cmd register and return old value
 * -----------------------------------------------------------------*/
static int snd_es1938_bits(struct es1938 *chip, unsigned char reg, unsigned char mask,
			   unsigned char val)
{
	unsigned long flags;
	unsigned char old, new, oval;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_es1938_write_cmd(chip, ESS_CMD_READREG);
	snd_es1938_write_cmd(chip, reg);
	old = snd_es1938_get_byte(chip);
	oval = old & mask;
	if (val != oval) {
		snd_es1938_write_cmd(chip, reg);
		new = (old & ~mask) | (val & mask);
		snd_es1938_write_cmd(chip, new);
		dev_dbg(chip->card->dev, "Reg %02x was %02x, set to %02x\n",
			   reg, old, new);
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return oval;
}

/* --------------------------------------------------------------------
 * Reset the chip
 * --------------------------------------------------------------------*/
static void snd_es1938_reset(struct es1938 *chip)
{
	int i;

	outb(3, SLSB_REG(chip, RESET));
	inb(SLSB_REG(chip, RESET));
	outb(0, SLSB_REG(chip, RESET));
	for (i = 0; i < RESET_LOOP_TIMEOUT; i++) {
		if (inb(SLSB_REG(chip, STATUS)) & 0x80) {
			if (inb(SLSB_REG(chip, READDATA)) == 0xaa)
				goto __next;
		}
	}
	dev_err(chip->card->dev, "ESS Solo-1 reset failed\n");

     __next:
	snd_es1938_write_cmd(chip, ESS_CMD_ENABLEEXT);

	/* Demand transfer DMA: 4 bytes per DMA request */
	snd_es1938_write(chip, ESS_CMD_DMATYPE, 2);

	/* Change behaviour of register A1
	   4x oversampling
	   2nd channel DAC asynchronous */                                                      
	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2MODE, 0x32);
	/* enable/select DMA channel and IRQ channel */
	snd_es1938_bits(chip, ESS_CMD_IRQCONTROL, 0xf0, 0x50);
	snd_es1938_bits(chip, ESS_CMD_DRQCONTROL, 0xf0, 0x50);
	snd_es1938_write_cmd(chip, ESS_CMD_ENABLEAUDIO1);
	/* Set spatializer parameters to recommended values */
	snd_es1938_mixer_write(chip, 0x54, 0x8f);
	snd_es1938_mixer_write(chip, 0x56, 0x95);
	snd_es1938_mixer_write(chip, 0x58, 0x94);
	snd_es1938_mixer_write(chip, 0x5a, 0x80);
}

/* --------------------------------------------------------------------
 * Reset the FIFOs
 * --------------------------------------------------------------------*/
static void snd_es1938_reset_fifo(struct es1938 *chip)
{
	outb(2, SLSB_REG(chip, RESET));
	outb(0, SLSB_REG(chip, RESET));
}

static const struct snd_ratnum clocks[2] = {
	{
		.num = 793800,
		.den_min = 1,
		.den_max = 128,
		.den_step = 1,
	},
	{
		.num = 768000,
		.den_min = 1,
		.den_max = 128,
		.den_step = 1,
	}
};

static const struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks = {
	.nrats = 2,
	.rats = clocks,
};


static void snd_es1938_rate_set(struct es1938 *chip, 
				struct snd_pcm_substream *substream,
				int mode)
{
	unsigned int bits, div0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	if (runtime->rate_num == clocks[0].num)
		bits = 128 - runtime->rate_den;
	else
		bits = 256 - runtime->rate_den;

	/* set filter register */
	div0 = 256 - 7160000*20/(8*82*runtime->rate);
		
	if (mode == DAC2) {
		snd_es1938_mixer_write(chip, 0x70, bits);
		snd_es1938_mixer_write(chip, 0x72, div0);
	} else {
		snd_es1938_write(chip, 0xA1, bits);
		snd_es1938_write(chip, 0xA2, div0);
	}
}

/* --------------------------------------------------------------------
 * Configure Solo1 builtin DMA Controller
 * --------------------------------------------------------------------*/

static void snd_es1938_playback1_setdma(struct es1938 *chip)
{
	outb(0x00, SLIO_REG(chip, AUDIO2MODE));
	outl(chip->dma2_start, SLIO_REG(chip, AUDIO2DMAADDR));
	outw(0, SLIO_REG(chip, AUDIO2DMACOUNT));
	outw(chip->dma2_size, SLIO_REG(chip, AUDIO2DMACOUNT));
}

static void snd_es1938_playback2_setdma(struct es1938 *chip)
{
	/* Enable DMA controller */
	outb(0xc4, SLDM_REG(chip, DMACOMMAND));
	/* 1. Master reset */
	outb(0, SLDM_REG(chip, DMACLEAR));
	/* 2. Mask DMA */
	outb(1, SLDM_REG(chip, DMAMASK));
	outb(0x18, SLDM_REG(chip, DMAMODE));
	outl(chip->dma1_start, SLDM_REG(chip, DMAADDR));
	outw(chip->dma1_size - 1, SLDM_REG(chip, DMACOUNT));
	/* 3. Unmask DMA */
	outb(0, SLDM_REG(chip, DMAMASK));
}

static void snd_es1938_capture_setdma(struct es1938 *chip)
{
	/* Enable DMA controller */
	outb(0xc4, SLDM_REG(chip, DMACOMMAND));
	/* 1. Master reset */
	outb(0, SLDM_REG(chip, DMACLEAR));
	/* 2. Mask DMA */
	outb(1, SLDM_REG(chip, DMAMASK));
	outb(0x14, SLDM_REG(chip, DMAMODE));
	outl(chip->dma1_start, SLDM_REG(chip, DMAADDR));
	chip->last_capture_dmaaddr = chip->dma1_start;
	outw(chip->dma1_size - 1, SLDM_REG(chip, DMACOUNT));
	/* 3. Unmask DMA */
	outb(0, SLDM_REG(chip, DMAMASK));
}

/* ----------------------------------------------------------------------
 *
 *                           *** PCM part ***
 */

static int snd_es1938_capture_trigger(struct snd_pcm_substream *substream,
				      int cmd)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	int val;
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		val = 0x0f;
		chip->active |= ADC1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		val = 0x00;
		chip->active &= ~ADC1;
		break;
	default:
		return -EINVAL;
	}
	snd_es1938_write(chip, ESS_CMD_DMACONTROL, val);
	return 0;
}

static int snd_es1938_playback1_trigger(struct snd_pcm_substream *substream,
					int cmd)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		/* According to the documentation this should be:
		   0x13 but that value may randomly swap stereo channels */
                snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0x92);
                udelay(10);
		snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0x93);
                /* This two stage init gives the FIFO -> DAC connection time to
                 * settle before first data from DMA flows in.  This should ensure
                 * no swapping of stereo channels.  Report a bug if otherwise :-) */
		outb(0x0a, SLIO_REG(chip, AUDIO2MODE));
		chip->active |= DAC2;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		outb(0, SLIO_REG(chip, AUDIO2MODE));
		snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0);
		chip->active &= ~DAC2;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int snd_es1938_playback2_trigger(struct snd_pcm_substream *substream,
					int cmd)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	int val;
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		val = 5;
		chip->active |= DAC1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		val = 0;
		chip->active &= ~DAC1;
		break;
	default:
		return -EINVAL;
	}
	snd_es1938_write(chip, ESS_CMD_DMACONTROL, val);
	return 0;
}

static int snd_es1938_playback_trigger(struct snd_pcm_substream *substream,
				       int cmd)
{
	switch (substream->number) {
	case 0:
		return snd_es1938_playback1_trigger(substream, cmd);
	case 1:
		return snd_es1938_playback2_trigger(substream, cmd);
	}
	snd_BUG();
	return -EINVAL;
}

/* --------------------------------------------------------------------
 * First channel for Extended Mode Audio 1 ADC Operation
 * --------------------------------------------------------------------*/
static int snd_es1938_capture_prepare(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int u, is8, mono;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma1_size = size;
	chip->dma1_start = runtime->dma_addr;

	mono = (runtime->channels > 1) ? 0 : 1;
	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
	u = snd_pcm_format_unsigned(runtime->format);

	chip->dma1_shift = 2 - mono - is8;

	snd_es1938_reset_fifo(chip);
	
	/* program type */
	snd_es1938_bits(chip, ESS_CMD_ANALOGCONTROL, 0x03, (mono ? 2 : 1));

	/* set clock and counters */
        snd_es1938_rate_set(chip, substream, ADC1);

	count = 0x10000 - count;
	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADL, count & 0xff);
	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADH, count >> 8);

	/* initialize and configure ADC */
	snd_es1938_write(chip, ESS_CMD_SETFORMAT2, u ? 0x51 : 0x71);
	snd_es1938_write(chip, ESS_CMD_SETFORMAT2, 0x90 | 
		       (u ? 0x00 : 0x20) | 
		       (is8 ? 0x00 : 0x04) | 
		       (mono ? 0x40 : 0x08));

	//	snd_es1938_reset_fifo(chip);	

	/* 11. configure system interrupt controller and DMA controller */
	snd_es1938_capture_setdma(chip);

	return 0;
}


/* ------------------------------------------------------------------------------
 * Second Audio channel DAC Operation
 * ------------------------------------------------------------------------------*/
static int snd_es1938_playback1_prepare(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int u, is8, mono;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma2_size = size;
	chip->dma2_start = runtime->dma_addr;

	mono = (runtime->channels > 1) ? 0 : 1;
	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
	u = snd_pcm_format_unsigned(runtime->format);

	chip->dma2_shift = 2 - mono - is8;

        snd_es1938_reset_fifo(chip);

	/* set clock and counters */
        snd_es1938_rate_set(chip, substream, DAC2);

	count >>= 1;
	count = 0x10000 - count;
	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2TCOUNTL, count & 0xff);
	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2TCOUNTH, count >> 8);

	/* initialize and configure Audio 2 DAC */
	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL2, 0x40 | (u ? 0 : 4) |
			       (mono ? 0 : 2) | (is8 ? 0 : 1));

	/* program DMA */
	snd_es1938_playback1_setdma(chip);
	
	return 0;
}

static int snd_es1938_playback2_prepare(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int u, is8, mono;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma1_size = size;
	chip->dma1_start = runtime->dma_addr;

	mono = (runtime->channels > 1) ? 0 : 1;
	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
	u = snd_pcm_format_unsigned(runtime->format);

	chip->dma1_shift = 2 - mono - is8;

	count = 0x10000 - count;
 
	/* reset */
	snd_es1938_reset_fifo(chip);
	
	snd_es1938_bits(chip, ESS_CMD_ANALOGCONTROL, 0x03, (mono ? 2 : 1));

	/* set clock and counters */
        snd_es1938_rate_set(chip, substream, DAC1);
	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADL, count & 0xff);
	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADH, count >> 8);

	/* initialized and configure DAC */
        snd_es1938_write(chip, ESS_CMD_SETFORMAT, u ? 0x80 : 0x00);
        snd_es1938_write(chip, ESS_CMD_SETFORMAT, u ? 0x51 : 0x71);
        snd_es1938_write(chip, ESS_CMD_SETFORMAT2, 
			 0x90 | (mono ? 0x40 : 0x08) |
			 (is8 ? 0x00 : 0x04) | (u ? 0x00 : 0x20));

	/* program DMA */
	snd_es1938_playback2_setdma(chip);
	
	return 0;
}

static int snd_es1938_playback_prepare(struct snd_pcm_substream *substream)
{
	switch (substream->number) {
	case 0:
		return snd_es1938_playback1_prepare(substream);
	case 1:
		return snd_es1938_playback2_prepare(substream);
	}
	snd_BUG();
	return -EINVAL;
}

/* during the incrementing of dma counters the DMA register reads sometimes
   returns garbage. To ensure a valid hw pointer, the following checks which
   should be very unlikely to fail are used:
   - is the current DMA address in the valid DMA range ?
   - is the sum of DMA address and DMA counter pointing to the last DMA byte ?
   One can argue this could differ by one byte depending on which register is
   updated first, so the implementation below allows for that.
*/
static snd_pcm_uframes_t snd_es1938_capture_pointer(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
#if 0
	size_t old, new;
	/* This stuff is *needed*, don't ask why - AB */
	old = inw(SLDM_REG(chip, DMACOUNT));
	while ((new = inw(SLDM_REG(chip, DMACOUNT))) != old)
		old = new;
	ptr = chip->dma1_size - 1 - new;
#else
	size_t count;
	unsigned int diff;

	ptr = inl(SLDM_REG(chip, DMAADDR));
	count = inw(SLDM_REG(chip, DMACOUNT));
	diff = chip->dma1_start + chip->dma1_size - ptr - count;

	if (diff > 3 || ptr < chip->dma1_start
	      || ptr >= chip->dma1_start+chip->dma1_size)
	  ptr = chip->last_capture_dmaaddr;            /* bad, use last saved */
	else
	  chip->last_capture_dmaaddr = ptr;            /* good, remember it */

	ptr -= chip->dma1_start;
#endif
	return ptr >> chip->dma1_shift;
}

static snd_pcm_uframes_t snd_es1938_playback1_pointer(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
#if 1
	ptr = chip->dma2_size - inw(SLIO_REG(chip, AUDIO2DMACOUNT));
#else
	ptr = inl(SLIO_REG(chip, AUDIO2DMAADDR)) - chip->dma2_start;
#endif
	return ptr >> chip->dma2_shift;
}

static snd_pcm_uframes_t snd_es1938_playback2_pointer(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	size_t old, new;
#if 1
	/* This stuff is *needed*, don't ask why - AB */
	old = inw(SLDM_REG(chip, DMACOUNT));
	while ((new = inw(SLDM_REG(chip, DMACOUNT))) != old)
		old = new;
	ptr = chip->dma1_size - 1 - new;
#else
	ptr = inl(SLDM_REG(chip, DMAADDR)) - chip->dma1_start;
#endif
	return ptr >> chip->dma1_shift;
}

static snd_pcm_uframes_t snd_es1938_playback_pointer(struct snd_pcm_substream *substream)
{
	switch (substream->number) {
	case 0:
		return snd_es1938_playback1_pointer(substream);
	case 1:
		return snd_es1938_playback2_pointer(substream);
	}
	snd_BUG();
	return -EINVAL;
}

static int snd_es1938_capture_copy(struct snd_pcm_substream *substream,
				   int channel, unsigned long pos,
				   struct iov_iter *dst, unsigned long count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct es1938 *chip = snd_pcm_substream_chip(substream);

	if (snd_BUG_ON(pos + count > chip->dma1_size))
		return -EINVAL;
	if (pos + count < chip->dma1_size) {
		if (copy_to_iter(runtime->dma_area + pos + 1, count, dst) != count)
			return -EFAULT;
	} else {
		if (copy_to_iter(runtime->dma_area + pos + 1, count - 1, dst) != count - 1)
			return -EFAULT;
		if (copy_to_iter(runtime->dma_area, 1, dst) != 1)
			return -EFAULT;
	}
	return 0;
}

/* ----------------------------------------------------------------------
 * Audio1 Capture (ADC)
 * ----------------------------------------------------------------------*/
static const struct snd_pcm_hardware snd_es1938_capture =
{
	.info =			(SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_BLOCK_TRANSFER),
	.formats =		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		6000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
        .buffer_bytes_max =	0x8000,       /* DMA controller screws on higher values */
	.period_bytes_min =	64,
	.period_bytes_max =	0x8000,
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		256,
};

/* -----------------------------------------------------------------------
 * Audio2 Playback (DAC)
 * -----------------------------------------------------------------------*/
static const struct snd_pcm_hardware snd_es1938_playback =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		6000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
        .buffer_bytes_max =	0x8000,       /* DMA controller screws on higher values */
	.period_bytes_min =	64,
	.period_bytes_max =	0x8000,
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		256,
};

static int snd_es1938_capture_open(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (chip->playback2_substream)
		return -EAGAIN;
	chip->capture_substream = substream;
	runtime->hw = snd_es1938_capture;
	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				      &hw_constraints_clocks);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, 0xff00);
	return 0;
}

static int snd_es1938_playback_open(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	switch (substream->number) {
	case 0:
		chip->playback1_substream = substream;
		break;
	case 1:
		if (chip->capture_substream)
			return -EAGAIN;
		chip->playback2_substream = substream;
		break;
	default:
		snd_BUG();
		return -EINVAL;
	}
	runtime->hw = snd_es1938_playback;
	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				      &hw_constraints_clocks);
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, 0xff00);
	return 0;
}

static int snd_es1938_capture_close(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);

	chip->capture_substream = NULL;
	return 0;
}

static int snd_es1938_playback_close(struct snd_pcm_substream *substream)
{
	struct es1938 *chip = snd_pcm_substream_chip(substream);

	switch (substream->number) {
	case 0:
		chip->playback1_substream = NULL;
		break;
	case 1:
		chip->playback2_substream = NULL;
		break;
	default:
		snd_BUG();
		return -EINVAL;
	}
	return 0;
}

static const struct snd_pcm_ops snd_es1938_playback_ops = {
	.open =		snd_es1938_playback_open,
	.close =	snd_es1938_playback_close,
	.prepare =	snd_es1938_playback_prepare,
	.trigger =	snd_es1938_playback_trigger,
	.pointer =	snd_es1938_playback_pointer,
};

static const struct snd_pcm_ops snd_es1938_capture_ops = {
	.open =		snd_es1938_capture_open,
	.close =	snd_es1938_capture_close,
	.prepare =	snd_es1938_capture_prepare,
	.trigger =	snd_es1938_capture_trigger,
	.pointer =	snd_es1938_capture_pointer,
	.copy =		snd_es1938_capture_copy,
};

static int snd_es1938_new_pcm(struct es1938 *chip, int device)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(chip->card, "es-1938-1946", device, 2, 1, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_es1938_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_es1938_capture_ops);
	
	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, "ESS Solo-1");

	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
				       &chip->pci->dev, 64*1024, 64*1024);

	chip->pcm = pcm;
	return 0;
}

/* -------------------------------------------------------------------
 * 
 *                       *** Mixer part ***
 */

static int snd_es1938_info_mux(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_info *uinfo)
{
	static const char * const texts[8] = {
		"Mic", "Mic Master", "CD", "AOUT",
		"Mic1", "Mix", "Line", "Master"
	};

	return snd_ctl_enum_info(uinfo, 1, 8, texts);
}

static int snd_es1938_get_mux(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.enumerated.item[0] = snd_es1938_mixer_read(chip, 0x1c) & 0x07;
	return 0;
}

static int snd_es1938_put_mux(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	unsigned char val = ucontrol->value.enumerated.item[0];
	
	if (val > 7)
		return -EINVAL;
	return snd_es1938_mixer_bits(chip, 0x1c, 0x07, val) != val;
}

#define snd_es1938_info_spatializer_enable	snd_ctl_boolean_mono_info

static int snd_es1938_get_spatializer_enable(struct snd_kcontrol *kcontrol,
					     struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	unsigned char val = snd_es1938_mixer_read(chip, 0x50);
	ucontrol->value.integer.value[0] = !!(val & 8);
	return 0;
}

static int snd_es1938_put_spatializer_enable(struct snd_kcontrol *kcontrol,
					     struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	unsigned char oval, nval;
	int change;
	nval = ucontrol->value.integer.value[0] ? 0x0c : 0x04;
	oval = snd_es1938_mixer_read(chip, 0x50) & 0x0c;
	change = nval != oval;
	if (change) {
		snd_es1938_mixer_write(chip, 0x50, nval & ~0x04);
		snd_es1938_mixer_write(chip, 0x50, nval);
	}
	return change;
}

static int snd_es1938_info_hw_volume(struct snd_kcontrol *kcontrol,
				     struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 63;
	return 0;
}

static int snd_es1938_get_hw_volume(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.integer.value[0] = snd_es1938_mixer_read(chip, 0x61) & 0x3f;
	ucontrol->value.integer.value[1] = snd_es1938_mixer_read(chip, 0x63) & 0x3f;
	return 0;
}

#define snd_es1938_info_hw_switch		snd_ctl_boolean_stereo_info

static int snd_es1938_get_hw_switch(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.integer.value[0] = !(snd_es1938_mixer_read(chip, 0x61) & 0x40);
	ucontrol->value.integer.value[1] = !(snd_es1938_mixer_read(chip, 0x63) & 0x40);
	return 0;
}

static void snd_es1938_hwv_free(struct snd_kcontrol *kcontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	chip->master_volume = NULL;
	chip->master_switch = NULL;
	chip->hw_volume = NULL;
	chip->hw_switch = NULL;
}

static int snd_es1938_reg_bits(struct es1938 *chip, unsigned char reg,
			       unsigned char mask, unsigned char val)
{
	if (reg < 0xa0)
		return snd_es1938_mixer_bits(chip, reg, mask, val);
	else
		return snd_es1938_bits(chip, reg, mask, val);
}

static int snd_es1938_reg_read(struct es1938 *chip, unsigned char reg)
{
	if (reg < 0xa0)
		return snd_es1938_mixer_read(chip, reg);
	else
		return snd_es1938_read(chip, reg);
}

#define ES1938_SINGLE_TLV(xname, xindex, reg, shift, mask, invert, xtlv)    \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,\
  .name = xname, .index = xindex, \
  .info = snd_es1938_info_single, \
  .get = snd_es1938_get_single, .put = snd_es1938_put_single, \
  .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24), \
  .tlv = { .p = xtlv } }
#define ES1938_SINGLE(xname, xindex, reg, shift, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_es1938_info_single, \
  .get = snd_es1938_get_single, .put = snd_es1938_put_single, \
  .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24) }

static int snd_es1938_info_single(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 16) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_es1938_get_single(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	int val;
	
	val = snd_es1938_reg_read(chip, reg);
	ucontrol->value.integer.value[0] = (val >> shift) & mask;
	if (invert)
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
	return 0;
}

static int snd_es1938_put_single(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	unsigned char val;
	
	val = (ucontrol->value.integer.value[0] & mask);
	if (invert)
		val = mask - val;
	mask <<= shift;
	val <<= shift;
	return snd_es1938_reg_bits(chip, reg, mask, val) != val;
}

#define ES1938_DOUBLE_TLV(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert, xtlv) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,\
  .name = xname, .index = xindex, \
  .info = snd_es1938_info_double, \
  .get = snd_es1938_get_double, .put = snd_es1938_put_double, \
  .private_value = left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22), \
  .tlv = { .p = xtlv } }
#define ES1938_DOUBLE(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_es1938_info_double, \
  .get = snd_es1938_get_double, .put = snd_es1938_put_double, \
  .private_value = left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22) }

static int snd_es1938_info_double(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 24) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_es1938_get_double(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	unsigned char left, right;
	
	left = snd_es1938_reg_read(chip, left_reg);
	if (left_reg != right_reg)
		right = snd_es1938_reg_read(chip, right_reg);
	else
		right = left;
	ucontrol->value.integer.value[0] = (left >> shift_left) & mask;
	ucontrol->value.integer.value[1] = (right >> shift_right) & mask;
	if (invert) {
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
		ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
	}
	return 0;
}

static int snd_es1938_put_double(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct es1938 *chip = snd_kcontrol_chip(kcontrol);
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	int change;
	unsigned char val1, val2, mask1, mask2;
	
	val1 = ucontrol->value.integer.value[0] & mask;
	val2 = ucontrol->value.integer.value[1] & mask;
	if (invert) {
		val1 = mask - val1;
		val2 = mask - val2;
	}
	val1 <<= shift_left;
	val2 <<= shift_right;
	mask1 = mask << shift_left;
	mask2 = mask << shift_right;
	if (left_reg != right_reg) {
		change = 0;
		if (snd_es1938_reg_bits(chip, left_reg, mask1, val1) != val1)
			change = 1;
		if (snd_es1938_reg_bits(chip, right_reg, mask2, val2) != val2)
			change = 1;
	} else {
		change = (snd_es1938_reg_bits(chip, left_reg, mask1 | mask2, 
					      val1 | val2) != (val1 | val2));
	}
	return change;
}

static const DECLARE_TLV_DB_RANGE(db_scale_master,
	0, 54, TLV_DB_SCALE_ITEM(-3600, 50, 1),
	54, 63, TLV_DB_SCALE_ITEM(-900, 100, 0),
);

static const DECLARE_TLV_DB_RANGE(db_scale_audio1,
	0, 8, TLV_DB_SCALE_ITEM(-3300, 300, 1),
	8, 15, TLV_DB_SCALE_ITEM(-900, 150, 0),
);

static const DECLARE_TLV_DB_RANGE(db_scale_audio2,
	0, 8, TLV_DB_SCALE_ITEM(-3450, 300, 1),
	8, 15, TLV_DB_SCALE_ITEM(-1050, 150, 0),
);

static const DECLARE_TLV_DB_RANGE(db_scale_mic,
	0, 8, TLV_DB_SCALE_ITEM(-2400, 300, 1),
	8, 15, TLV_DB_SCALE_ITEM(0, 150, 0),
);

static const DECLARE_TLV_DB_RANGE(db_scale_line,
	0, 8, TLV_DB_SCALE_ITEM(-3150, 300, 1),
	8, 15, TLV_DB_SCALE_ITEM(-750, 150, 0),
);

static const DECLARE_TLV_DB_SCALE(db_scale_capture, 0, 150, 0);

static const struct snd_kcontrol_new snd_es1938_controls[] = {
ES1938_DOUBLE_TLV("Master Playback Volume", 0, 0x60, 0x62, 0, 0, 63, 0,
		  db_scale_master),
ES1938_DOUBLE("Master Playback Switch", 0, 0x60, 0x62, 6, 6, 1, 1),
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Hardware Master Playback Volume",
	.access = SNDRV_CTL_ELEM_ACCESS_READ,
	.info = snd_es1938_info_hw_volume,
	.get = snd_es1938_get_hw_volume,
},
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.access = (SNDRV_CTL_ELEM_ACCESS_READ |
		   SNDRV_CTL_ELEM_ACCESS_TLV_READ),
	.name = "Hardware Master Playback Switch",
	.info = snd_es1938_info_hw_switch,
	.get = snd_es1938_get_hw_switch,
	.tlv = { .p = db_scale_master },
},
ES1938_SINGLE("Hardware Volume Split", 0, 0x64, 7, 1, 0),
ES1938_DOUBLE_TLV("Line Playback Volume", 0, 0x3e, 0x3e, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE("CD Playback Volume", 0, 0x38, 0x38, 4, 0, 15, 0),
ES1938_DOUBLE_TLV("FM Playback Volume", 0, 0x36, 0x36, 4, 0, 15, 0,
		  db_scale_mic),
ES1938_DOUBLE_TLV("Mono Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("Mic Playback Volume", 0, 0x1a, 0x1a, 4, 0, 15, 0,
		  db_scale_mic),
ES1938_DOUBLE_TLV("Aux Playback Volume", 0, 0x3a, 0x3a, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("Capture Volume", 0, 0xb4, 0xb4, 4, 0, 15, 0,
		  db_scale_capture),
ES1938_SINGLE("Beep Volume", 0, 0x3c, 0, 7, 0),
ES1938_SINGLE("Record Monitor", 0, 0xa8, 3, 1, 0),
ES1938_SINGLE("Capture Switch", 0, 0x1c, 4, 1, 1),
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Source",
	.info = snd_es1938_info_mux,
	.get = snd_es1938_get_mux,
	.put = snd_es1938_put_mux,
},
ES1938_DOUBLE_TLV("Mono Input Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("PCM Capture Volume", 0, 0x69, 0x69, 4, 0, 15, 0,
		  db_scale_audio2),
ES1938_DOUBLE_TLV("Mic Capture Volume", 0, 0x68, 0x68, 4, 0, 15, 0,
		  db_scale_mic),
ES1938_DOUBLE_TLV("Line Capture Volume", 0, 0x6e, 0x6e, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("FM Capture Volume", 0, 0x6b, 0x6b, 4, 0, 15, 0,
		  db_scale_mic),
ES1938_DOUBLE_TLV("Mono Capture Volume", 0, 0x6f, 0x6f, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("CD Capture Volume", 0, 0x6a, 0x6a, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("Aux Capture Volume", 0, 0x6c, 0x6c, 4, 0, 15, 0,
		  db_scale_line),
ES1938_DOUBLE_TLV("PCM Playback Volume", 0, 0x7c, 0x7c, 4, 0, 15, 0,
		  db_scale_audio2),
ES1938_DOUBLE_TLV("PCM Playback Volume", 1, 0x14, 0x14, 4, 0, 15, 0,
		  db_scale_audio1),
ES1938_SINGLE("3D Control - Level", 0, 0x52, 0, 63, 0),
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "3D Control - Switch",
	.info = snd_es1938_info_spatializer_enable,
	.get = snd_es1938_get_spatializer_enable,
	.put = snd_es1938_put_spatializer_enable,
},
ES1938_SINGLE("Mic Boost (+26dB)", 0, 0x7d, 3, 1, 0)
};


/* ---------------------------------------------------------------------------- */
/* ---------------------------------------------------------------------------- */

/*
 * initialize the chip - used by resume callback, too
 */
static void snd_es1938_chip_init(struct es1938 *chip)
{
	/* reset chip */
	snd_es1938_reset(chip);

	/* configure native mode */

	/* enable bus master */
	pci_set_master(chip->pci);

	/* disable legacy audio */
	pci_write_config_word(chip->pci, SL_PCI_LEGACYCONTROL, 0x805f);

	/* set DDMA base */
	pci_write_config_word(chip->pci, SL_PCI_DDMACONTROL, chip->ddma_port | 1);

	/* set DMA/IRQ policy */
	pci_write_config_dword(chip->pci, SL_PCI_CONFIG, 0);

	/* enable Audio 1, Audio 2, MPU401 IRQ and HW volume IRQ*/
	outb(0xf0, SLIO_REG(chip, IRQCONTROL));

	/* reset DMA */
	outb(0, SLDM_REG(chip, DMACLEAR));
}

#ifdef CONFIG_PM_SLEEP
/*
 * PM support
 */

static const unsigned char saved_regs[SAVED_REG_SIZE+1] = {
	0x14, 0x1a, 0x1c, 0x3a, 0x3c, 0x3e, 0x36, 0x38,
	0x50, 0x52, 0x60, 0x61, 0x62, 0x63, 0x64, 0x68,
	0x69, 0x6a, 0x6b, 0x6d, 0x6e, 0x6f, 0x7c, 0x7d,
	0xa8, 0xb4,
};


static int es1938_suspend(struct device *dev)
{
	struct snd_card *card = dev_get_drvdata(dev);
	struct es1938 *chip = card->private_data;
	const unsigned char *s;
	unsigned char *d;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

	/* save mixer-related registers */
	for (s = saved_regs, d = chip->saved_regs; *s; s++, d++)
		*d = snd_es1938_reg_read(chip, *s);

	outb(0x00, SLIO_REG(chip, IRQCONTROL)); /* disable irqs */
	if (chip->irq >= 0) {
		free_irq(chip->irq, chip);
		chip->irq = -1;
		card->sync_irq = -1;
	}
	return 0;
}

static int es1938_resume(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct es1938 *chip = card->private_data;
	const unsigned char *s;
	unsigned char *d;

	if (request_irq(pci->irq, snd_es1938_interrupt,
			IRQF_SHARED, KBUILD_MODNAME, chip)) {
		dev_err(dev, "unable to grab IRQ %d, disabling device\n",
			pci->irq);
		snd_card_disconnect(card);
		return -EIO;
	}
	chip->irq = pci->irq;
	card->sync_irq = chip->irq;
	snd_es1938_chip_init(chip);

	/* restore mixer-related registers */
	for (s = saved_regs, d = chip->saved_regs; *s; s++, d++) {
		if (*s < 0xa0)
			snd_es1938_mixer_write(chip, *s, *d);
		else
			snd_es1938_write(chip, *s, *d);
	}

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}

static SIMPLE_DEV_PM_OPS(es1938_pm, es1938_suspend, es1938_resume);
#define ES1938_PM_OPS	&es1938_pm
#else
#define ES1938_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP */

#ifdef SUPPORT_JOYSTICK
static int snd_es1938_create_gameport(struct es1938 *chip)
{
	struct gameport *gp;

	chip->gameport = gp = gameport_allocate_port();
	if (!gp) {
		dev_err(chip->card->dev,
			"cannot allocate memory for gameport\n");
		return -ENOMEM;
	}

	gameport_set_name(gp, "ES1938");
	gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
	gameport_set_dev_parent(gp, &chip->pci->dev);
	gp->io = chip->game_port;

	gameport_register_port(gp);

	return 0;
}

static void snd_es1938_free_gameport(struct es1938 *chip)
{
	if (chip->gameport) {
		gameport_unregister_port(chip->gameport);
		chip->gameport = NULL;
	}
}
#else
static inline int snd_es1938_create_gameport(struct es1938 *chip) { return -ENOSYS; }
static inline void snd_es1938_free_gameport(struct es1938 *chip) { }
#endif /* SUPPORT_JOYSTICK */

static void snd_es1938_free(struct snd_card *card)
{
	struct es1938 *chip = card->private_data;

	/* disable irqs */
	outb(0x00, SLIO_REG(chip, IRQCONTROL));
	if (chip->rmidi)
		snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0);

	snd_es1938_free_gameport(chip);

	if (chip->irq >= 0)
		free_irq(chip->irq, chip);
}

static int snd_es1938_create(struct snd_card *card,
			     struct pci_dev *pci)
{
	struct es1938 *chip = card->private_data;
	int err;

	/* enable PCI device */
	err = pcim_enable_device(pci);
	if (err < 0)
		return err;
        /* check, if we can restrict PCI DMA transfers to 24 bits */
	if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(24))) {
		dev_err(card->dev,
			"architecture does not support 24bit PCI busmaster DMA\n");
                return -ENXIO;
        }

	spin_lock_init(&chip->reg_lock);
	spin_lock_init(&chip->mixer_lock);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;
	err = pci_request_regions(pci, "ESS Solo-1");
	if (err < 0)
		return err;
	chip->io_port = pci_resource_start(pci, 0);
	chip->sb_port = pci_resource_start(pci, 1);
	chip->vc_port = pci_resource_start(pci, 2);
	chip->mpu_port = pci_resource_start(pci, 3);
	chip->game_port = pci_resource_start(pci, 4);
	/* still use non-managed irq handler as it's re-acquired at PM resume */
	if (request_irq(pci->irq, snd_es1938_interrupt, IRQF_SHARED,
			KBUILD_MODNAME, chip)) {
		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
		return -EBUSY;
	}
	chip->irq = pci->irq;
	card->sync_irq = chip->irq;
	card->private_free = snd_es1938_free;
	dev_dbg(card->dev,
		"create: io: 0x%lx, sb: 0x%lx, vc: 0x%lx, mpu: 0x%lx, game: 0x%lx\n",
		   chip->io_port, chip->sb_port, chip->vc_port, chip->mpu_port, chip->game_port);

	chip->ddma_port = chip->vc_port + 0x00;		/* fix from Thomas Sailer */

	snd_es1938_chip_init(chip);
	return 0;
}

/* --------------------------------------------------------------------
 * Interrupt handler
 * -------------------------------------------------------------------- */
static irqreturn_t snd_es1938_interrupt(int irq, void *dev_id)
{
	struct es1938 *chip = dev_id;
	unsigned char status;
	__always_unused unsigned char audiostatus;
	int handled = 0;

	status = inb(SLIO_REG(chip, IRQCONTROL));
#if 0
	dev_dbg(chip->card->dev,
		"Es1938debug - interrupt status: =0x%x\n", status);
#endif
	
	/* AUDIO 1 */
	if (status & 0x10) {
#if 0
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 1 interrupt\n");
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 1 DMAC DMA count: %u\n",
		       inw(SLDM_REG(chip, DMACOUNT)));
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 1 DMAC DMA base: %u\n",
		       inl(SLDM_REG(chip, DMAADDR)));
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 1 DMAC DMA status: 0x%x\n",
		       inl(SLDM_REG(chip, DMASTATUS)));
#endif
		/* clear irq */
		handled = 1;
		audiostatus = inb(SLSB_REG(chip, STATUS));
		if (chip->active & ADC1)
			snd_pcm_period_elapsed(chip->capture_substream);
		else if (chip->active & DAC1)
			snd_pcm_period_elapsed(chip->playback2_substream);
	}
	
	/* AUDIO 2 */
	if (status & 0x20) {
#if 0
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 2 interrupt\n");
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 2 DMAC DMA count: %u\n",
		       inw(SLIO_REG(chip, AUDIO2DMACOUNT)));
		dev_dbg(chip->card->dev,
		       "Es1938debug - AUDIO channel 2 DMAC DMA base: %u\n",
		       inl(SLIO_REG(chip, AUDIO2DMAADDR)));

#endif
		/* clear irq */
		handled = 1;
		snd_es1938_mixer_bits(chip, ESSSB_IREG_AUDIO2CONTROL2, 0x80, 0);
		if (chip->active & DAC2)
			snd_pcm_period_elapsed(chip->playback1_substream);
	}

	/* Hardware volume */
	if (status & 0x40) {
		int split = snd_es1938_mixer_read(chip, 0x64) & 0x80;
		handled = 1;
		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE, &chip->hw_switch->id);
		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE, &chip->hw_volume->id);
		if (!split) {
			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
				       &chip->master_switch->id);
			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
				       &chip->master_volume->id);
		}
		/* ack interrupt */
		snd_es1938_mixer_write(chip, 0x66, 0x00);
	}

	/* MPU401 */
	if (status & 0x80) {
		// the following line is evil! It switches off MIDI interrupt handling after the first interrupt received.
		// replacing the last 0 by 0x40 works for ESS-Solo1, but just doing nothing works as well!
		// andreas@flying-snail.de
		// snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0); /* ack? */
		if (chip->rmidi) {
			handled = 1;
			snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
		}
	}
	return IRQ_RETVAL(handled);
}

#define ES1938_DMA_SIZE 64

static int snd_es1938_mixer(struct es1938 *chip)
{
	struct snd_card *card;
	unsigned int idx;
	int err;

	card = chip->card;

	strcpy(card->mixername, "ESS Solo-1");

	for (idx = 0; idx < ARRAY_SIZE(snd_es1938_controls); idx++) {
		struct snd_kcontrol *kctl;
		kctl = snd_ctl_new1(&snd_es1938_controls[idx], chip);
		switch (idx) {
			case 0:
				chip->master_volume = kctl;
				kctl->private_free = snd_es1938_hwv_free;
				break;
			case 1:
				chip->master_switch = kctl;
				kctl->private_free = snd_es1938_hwv_free;
				break;
			case 2:
				chip->hw_volume = kctl;
				kctl->private_free = snd_es1938_hwv_free;
				break;
			case 3:
				chip->hw_switch = kctl;
				kctl->private_free = snd_es1938_hwv_free;
				break;
			}
		err = snd_ctl_add(card, kctl);
		if (err < 0)
			return err;
	}
	return 0;
}
       

static int __snd_es1938_probe(struct pci_dev *pci,
			      const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct es1938 *chip;
	struct snd_opl3 *opl3;
	int idx, err;

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

	err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
				sizeof(*chip), &card);
	if (err < 0)
		return err;
	chip = card->private_data;

	for (idx = 0; idx < 5; idx++)
		if (pci_resource_start(pci, idx) == 0 ||
		    !(pci_resource_flags(pci, idx) & IORESOURCE_IO))
			return -ENODEV;

	err = snd_es1938_create(card, pci);
	if (err < 0)
		return err;

	strcpy(card->driver, "ES1938");
	strcpy(card->shortname, "ESS ES1938 (Solo-1)");
	sprintf(card->longname, "%s rev %i, irq %i",
		card->shortname,
		chip->revision,
		chip->irq);

	err = snd_es1938_new_pcm(chip, 0);
	if (err < 0)
		return err;
	err = snd_es1938_mixer(chip);
	if (err < 0)
		return err;
	if (snd_opl3_create(card,
			    SLSB_REG(chip, FMLOWADDR),
			    SLSB_REG(chip, FMHIGHADDR),
			    OPL3_HW_OPL3, 1, &opl3) < 0) {
		dev_err(card->dev, "OPL3 not detected at 0x%lx\n",
			   SLSB_REG(chip, FMLOWADDR));
	} else {
		err = snd_opl3_timer_new(opl3, 0, 1);
		if (err < 0)
	                return err;
		err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
		if (err < 0)
	                return err;
	}
	if (snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
				chip->mpu_port,
				MPU401_INFO_INTEGRATED | MPU401_INFO_IRQ_HOOK,
				-1, &chip->rmidi) < 0) {
		dev_err(card->dev, "unable to initialize MPU-401\n");
	} else {
		// this line is vital for MIDI interrupt handling on ess-solo1
		// andreas@flying-snail.de
		snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0x40);
	}

	snd_es1938_create_gameport(chip);

	err = snd_card_register(card);
	if (err < 0)
		return err;

	pci_set_drvdata(pci, card);
	dev++;
	return 0;
}

static int snd_es1938_probe(struct pci_dev *pci,
			    const struct pci_device_id *pci_id)
{
	return snd_card_free_on_error(&pci->dev, __snd_es1938_probe(pci, pci_id));
}

static struct pci_driver es1938_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_es1938_ids,
	.probe = snd_es1938_probe,
	.driver = {
		.pm = ES1938_PM_OPS,
	},
};

module_pci_driver(es1938_driver);