summaryrefslogtreecommitdiffstats
path: root/sound/pci/emu10k1/emu10k1x.c
blob: 89043392f3ec73796eaedd612891a8227192aa5c (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
 *  Driver EMU10K1X chips
 *
 *  Parts of this code were adapted from audigyls.c driver which is
 *  Copyright (c) by James Courtier-Dutton <James@superbug.demon.co.uk>
 *
 *  BUGS:
 *    --
 *
 *  TODO:
 *
 *  Chips (SB0200 model):
 *    - EMU10K1X-DBQ
 *    - STAC 9708T
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/info.h>
#include <sound/rawmidi.h>

MODULE_AUTHOR("Francisco Moraes <fmoraes@nc.rr.com>");
MODULE_DESCRIPTION("EMU10K1X");
MODULE_LICENSE("GPL");

// module parameters (see "Module Parameters")
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the EMU10K1X soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for the EMU10K1X soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable the EMU10K1X soundcard.");


// some definitions were borrowed from emu10k1 driver as they seem to be the same
/************************************************************************************************/
/* PCI function 0 registers, address = <val> + PCIBASE0						*/
/************************************************************************************************/

#define PTR			0x00		/* Indexed register set pointer register	*/
						/* NOTE: The CHANNELNUM and ADDRESS words can	*/
						/* be modified independently of each other.	*/

#define DATA			0x04		/* Indexed register set data register		*/

#define IPR			0x08		/* Global interrupt pending register		*/
						/* Clear pending interrupts by writing a 1 to	*/
						/* the relevant bits and zero to the other bits	*/
#define IPR_MIDITRANSBUFEMPTY   0x00000001	/* MIDI UART transmit buffer empty		*/
#define IPR_MIDIRECVBUFEMPTY    0x00000002	/* MIDI UART receive buffer empty		*/
#define IPR_CH_0_LOOP           0x00000800      /* Channel 0 loop                               */
#define IPR_CH_0_HALF_LOOP      0x00000100      /* Channel 0 half loop                          */
#define IPR_CAP_0_LOOP          0x00080000      /* Channel capture loop                         */
#define IPR_CAP_0_HALF_LOOP     0x00010000      /* Channel capture half loop                    */

#define INTE			0x0c		/* Interrupt enable register			*/
#define INTE_MIDITXENABLE       0x00000001	/* Enable MIDI transmit-buffer-empty interrupts	*/
#define INTE_MIDIRXENABLE       0x00000002	/* Enable MIDI receive-buffer-empty interrupts	*/
#define INTE_CH_0_LOOP          0x00000800      /* Channel 0 loop                               */
#define INTE_CH_0_HALF_LOOP     0x00000100      /* Channel 0 half loop                          */
#define INTE_CAP_0_LOOP         0x00080000      /* Channel capture loop                         */
#define INTE_CAP_0_HALF_LOOP    0x00010000      /* Channel capture half loop                    */

#define HCFG			0x14		/* Hardware config register			*/

#define HCFG_LOCKSOUNDCACHE	0x00000008	/* 1 = Cancel bustmaster accesses to soundcache */
						/* NOTE: This should generally never be used.  	*/
#define HCFG_AUDIOENABLE	0x00000001	/* 0 = CODECs transmit zero-valued samples	*/
						/* Should be set to 1 when the EMU10K1 is	*/
						/* completely initialized.			*/
#define GPIO			0x18		/* Defaults: 00001080-Analog, 00001000-SPDIF.   */


#define AC97DATA		0x1c		/* AC97 register set data register (16 bit)	*/

#define AC97ADDRESS		0x1e		/* AC97 register set address register (8 bit)	*/

/********************************************************************************************************/
/* Emu10k1x pointer-offset register set, accessed through the PTR and DATA registers			*/
/********************************************************************************************************/
#define PLAYBACK_LIST_ADDR	0x00		/* Base DMA address of a list of pointers to each period/size */
						/* One list entry: 4 bytes for DMA address, 
						 * 4 bytes for period_size << 16.
						 * One list entry is 8 bytes long.
						 * One list entry for each period in the buffer.
						 */
#define PLAYBACK_LIST_SIZE	0x01		/* Size of list in bytes << 16. E.g. 8 periods -> 0x00380000  */
#define PLAYBACK_LIST_PTR	0x02		/* Pointer to the current period being played */
#define PLAYBACK_DMA_ADDR	0x04		/* Playback DMA address */
#define PLAYBACK_PERIOD_SIZE	0x05		/* Playback period size */
#define PLAYBACK_POINTER	0x06		/* Playback period pointer. Sample currently in DAC */
#define PLAYBACK_UNKNOWN1       0x07
#define PLAYBACK_UNKNOWN2       0x08

/* Only one capture channel supported */
#define CAPTURE_DMA_ADDR	0x10		/* Capture DMA address */
#define CAPTURE_BUFFER_SIZE	0x11		/* Capture buffer size */
#define CAPTURE_POINTER		0x12		/* Capture buffer pointer. Sample currently in ADC */
#define CAPTURE_UNKNOWN         0x13

/* From 0x20 - 0x3f, last samples played on each channel */

#define TRIGGER_CHANNEL         0x40            /* Trigger channel playback                     */
#define TRIGGER_CHANNEL_0       0x00000001      /* Trigger channel 0                            */
#define TRIGGER_CHANNEL_1       0x00000002      /* Trigger channel 1                            */
#define TRIGGER_CHANNEL_2       0x00000004      /* Trigger channel 2                            */
#define TRIGGER_CAPTURE         0x00000100      /* Trigger capture channel                      */

#define ROUTING                 0x41            /* Setup sound routing ?                        */
#define ROUTING_FRONT_LEFT      0x00000001
#define ROUTING_FRONT_RIGHT     0x00000002
#define ROUTING_REAR_LEFT       0x00000004
#define ROUTING_REAR_RIGHT      0x00000008
#define ROUTING_CENTER_LFE      0x00010000

#define SPCS0			0x42		/* SPDIF output Channel Status 0 register	*/

#define SPCS1			0x43		/* SPDIF output Channel Status 1 register	*/

#define SPCS2			0x44		/* SPDIF output Channel Status 2 register	*/

#define SPCS_CLKACCYMASK	0x30000000	/* Clock accuracy				*/
#define SPCS_CLKACCY_1000PPM	0x00000000	/* 1000 parts per million			*/
#define SPCS_CLKACCY_50PPM	0x10000000	/* 50 parts per million				*/
#define SPCS_CLKACCY_VARIABLE	0x20000000	/* Variable accuracy				*/
#define SPCS_SAMPLERATEMASK	0x0f000000	/* Sample rate					*/
#define SPCS_SAMPLERATE_44	0x00000000	/* 44.1kHz sample rate				*/
#define SPCS_SAMPLERATE_48	0x02000000	/* 48kHz sample rate				*/
#define SPCS_SAMPLERATE_32	0x03000000	/* 32kHz sample rate				*/
#define SPCS_CHANNELNUMMASK	0x00f00000	/* Channel number				*/
#define SPCS_CHANNELNUM_UNSPEC	0x00000000	/* Unspecified channel number			*/
#define SPCS_CHANNELNUM_LEFT	0x00100000	/* Left channel					*/
#define SPCS_CHANNELNUM_RIGHT	0x00200000	/* Right channel				*/
#define SPCS_SOURCENUMMASK	0x000f0000	/* Source number				*/
#define SPCS_SOURCENUM_UNSPEC	0x00000000	/* Unspecified source number			*/
#define SPCS_GENERATIONSTATUS	0x00008000	/* Originality flag (see IEC-958 spec)		*/
#define SPCS_CATEGORYCODEMASK	0x00007f00	/* Category code (see IEC-958 spec)		*/
#define SPCS_MODEMASK		0x000000c0	/* Mode (see IEC-958 spec)			*/
#define SPCS_EMPHASISMASK	0x00000038	/* Emphasis					*/
#define SPCS_EMPHASIS_NONE	0x00000000	/* No emphasis					*/
#define SPCS_EMPHASIS_50_15	0x00000008	/* 50/15 usec 2 channel				*/
#define SPCS_COPYRIGHT		0x00000004	/* Copyright asserted flag -- do not modify	*/
#define SPCS_NOTAUDIODATA	0x00000002	/* 0 = Digital audio, 1 = not audio		*/
#define SPCS_PROFESSIONAL	0x00000001	/* 0 = Consumer (IEC-958), 1 = pro (AES3-1992)	*/

#define SPDIF_SELECT		0x45		/* Enables SPDIF or Analogue outputs 0-Analogue, 0x700-SPDIF */

/* This is the MPU port on the card                      					*/
#define MUDATA		0x47
#define MUCMD		0x48
#define MUSTAT		MUCMD

/* From 0x50 - 0x5f, last samples captured */

/*
 * The hardware has 3 channels for playback and 1 for capture.
 *  - channel 0 is the front channel
 *  - channel 1 is the rear channel
 *  - channel 2 is the center/lfe channel
 * Volume is controlled by the AC97 for the front and rear channels by
 * the PCM Playback Volume, Sigmatel Surround Playback Volume and 
 * Surround Playback Volume. The Sigmatel 4-Speaker Stereo switch affects
 * the front/rear channel mixing in the REAR OUT jack. When using the
 * 4-Speaker Stereo, both front and rear channels will be mixed in the
 * REAR OUT.
 * The center/lfe channel has no volume control and cannot be muted during
 * playback.
 */

struct emu10k1x_voice {
	struct emu10k1x *emu;
	int number;
	int use;
  
	struct emu10k1x_pcm *epcm;
};

struct emu10k1x_pcm {
	struct emu10k1x *emu;
	struct snd_pcm_substream *substream;
	struct emu10k1x_voice *voice;
	unsigned short running;
};

struct emu10k1x_midi {
	struct emu10k1x *emu;
	struct snd_rawmidi *rmidi;
	struct snd_rawmidi_substream *substream_input;
	struct snd_rawmidi_substream *substream_output;
	unsigned int midi_mode;
	spinlock_t input_lock;
	spinlock_t output_lock;
	spinlock_t open_lock;
	int tx_enable, rx_enable;
	int port;
	int ipr_tx, ipr_rx;
	void (*interrupt)(struct emu10k1x *emu, unsigned int status);
};

// definition of the chip-specific record
struct emu10k1x {
	struct snd_card *card;
	struct pci_dev *pci;

	unsigned long port;
	int irq;

	unsigned char revision;		/* chip revision */
	unsigned int serial;            /* serial number */
	unsigned short model;		/* subsystem id */

	spinlock_t emu_lock;
	spinlock_t voice_lock;

	struct snd_ac97 *ac97;
	struct snd_pcm *pcm;

	struct emu10k1x_voice voices[3];
	struct emu10k1x_voice capture_voice;
	u32 spdif_bits[3]; // SPDIF out setup

	struct snd_dma_buffer *dma_buffer;

	struct emu10k1x_midi midi;
};

/* hardware definition */
static const struct snd_pcm_hardware snd_emu10k1x_playback_hw = {
	.info =			(SNDRV_PCM_INFO_MMAP | 
				 SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_48000,
	.rate_min =		48000,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(32*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(16*1024),
	.periods_min =		2,
	.periods_max =		8,
	.fifo_size =		0,
};

static const struct snd_pcm_hardware snd_emu10k1x_capture_hw = {
	.info =			(SNDRV_PCM_INFO_MMAP | 
				 SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_48000,
	.rate_min =		48000,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	(32*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(16*1024),
	.periods_min =		2,
	.periods_max =		2,
	.fifo_size =		0,
};

static unsigned int snd_emu10k1x_ptr_read(struct emu10k1x * emu, 
					  unsigned int reg, 
					  unsigned int chn)
{
	unsigned long flags;
	unsigned int regptr, val;
  
	regptr = (reg << 16) | chn;

	spin_lock_irqsave(&emu->emu_lock, flags);
	outl(regptr, emu->port + PTR);
	val = inl(emu->port + DATA);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
	return val;
}

static void snd_emu10k1x_ptr_write(struct emu10k1x *emu, 
				   unsigned int reg, 
				   unsigned int chn, 
				   unsigned int data)
{
	unsigned int regptr;
	unsigned long flags;

	regptr = (reg << 16) | chn;

	spin_lock_irqsave(&emu->emu_lock, flags);
	outl(regptr, emu->port + PTR);
	outl(data, emu->port + DATA);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_emu10k1x_intr_enable(struct emu10k1x *emu, unsigned int intrenb)
{
	unsigned long flags;
	unsigned int intr_enable;

	spin_lock_irqsave(&emu->emu_lock, flags);
	intr_enable = inl(emu->port + INTE) | intrenb;
	outl(intr_enable, emu->port + INTE);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_emu10k1x_intr_disable(struct emu10k1x *emu, unsigned int intrenb)
{
	unsigned long flags;
	unsigned int intr_enable;

	spin_lock_irqsave(&emu->emu_lock, flags);
	intr_enable = inl(emu->port + INTE) & ~intrenb;
	outl(intr_enable, emu->port + INTE);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_emu10k1x_gpio_write(struct emu10k1x *emu, unsigned int value)
{
	unsigned long flags;

	spin_lock_irqsave(&emu->emu_lock, flags);
	outl(value, emu->port + GPIO);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_emu10k1x_pcm_free_substream(struct snd_pcm_runtime *runtime)
{
	kfree(runtime->private_data);
}

static void snd_emu10k1x_pcm_interrupt(struct emu10k1x *emu, struct emu10k1x_voice *voice)
{
	struct emu10k1x_pcm *epcm;

	epcm = voice->epcm;
	if (!epcm)
		return;
	if (epcm->substream == NULL)
		return;
#if 0
	dev_info(emu->card->dev,
		 "IRQ: position = 0x%x, period = 0x%x, size = 0x%x\n",
		   epcm->substream->ops->pointer(epcm->substream),
		   snd_pcm_lib_period_bytes(epcm->substream),
		   snd_pcm_lib_buffer_bytes(epcm->substream));
#endif
	snd_pcm_period_elapsed(epcm->substream);
}

/* open callback */
static int snd_emu10k1x_playback_open(struct snd_pcm_substream *substream)
{
	struct emu10k1x *chip = snd_pcm_substream_chip(substream);
	struct emu10k1x_pcm *epcm;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0)
		return err;
	err = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
	if (err < 0)
                return err;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;
	epcm->emu = chip;
	epcm->substream = substream;
  
	runtime->private_data = epcm;
	runtime->private_free = snd_emu10k1x_pcm_free_substream;
  
	runtime->hw = snd_emu10k1x_playback_hw;

	return 0;
}

/* close callback */
static int snd_emu10k1x_playback_close(struct snd_pcm_substream *substream)
{
	return 0;
}

/* hw_params callback */
static int snd_emu10k1x_pcm_hw_params(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params *hw_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;

	if (! epcm->voice) {
		epcm->voice = &epcm->emu->voices[substream->pcm->device];
		epcm->voice->use = 1;
		epcm->voice->epcm = epcm;
	}

	return 0;
}

/* hw_free callback */
static int snd_emu10k1x_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm;

	if (runtime->private_data == NULL)
		return 0;
	
	epcm = runtime->private_data;

	if (epcm->voice) {
		epcm->voice->use = 0;
		epcm->voice->epcm = NULL;
		epcm->voice = NULL;
	}

	return 0;
}

/* prepare callback */
static int snd_emu10k1x_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;
	int voice = epcm->voice->number;
	u32 *table_base = (u32 *)(emu->dma_buffer->area+1024*voice);
	u32 period_size_bytes = frames_to_bytes(runtime, runtime->period_size);
	int i;
	
	for(i = 0; i < runtime->periods; i++) {
		*table_base++=runtime->dma_addr+(i*period_size_bytes);
		*table_base++=period_size_bytes<<16;
	}

	snd_emu10k1x_ptr_write(emu, PLAYBACK_LIST_ADDR, voice, emu->dma_buffer->addr+1024*voice);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_LIST_SIZE, voice, (runtime->periods - 1) << 19);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_LIST_PTR, voice, 0);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_POINTER, voice, 0);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_UNKNOWN1, voice, 0);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_UNKNOWN2, voice, 0);
	snd_emu10k1x_ptr_write(emu, PLAYBACK_DMA_ADDR, voice, runtime->dma_addr);

	snd_emu10k1x_ptr_write(emu, PLAYBACK_PERIOD_SIZE, voice, frames_to_bytes(runtime, runtime->period_size)<<16);

	return 0;
}

/* trigger callback */
static int snd_emu10k1x_pcm_trigger(struct snd_pcm_substream *substream,
				    int cmd)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;
	int channel = epcm->voice->number;
	int result = 0;

	/*
	dev_dbg(emu->card->dev,
		"trigger - emu10k1x = 0x%x, cmd = %i, pointer = %d\n",
		(int)emu, cmd, (int)substream->ops->pointer(substream));
	*/

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		if(runtime->periods == 2)
			snd_emu10k1x_intr_enable(emu, (INTE_CH_0_LOOP | INTE_CH_0_HALF_LOOP) << channel);
		else
			snd_emu10k1x_intr_enable(emu, INTE_CH_0_LOOP << channel);
		epcm->running = 1;
		snd_emu10k1x_ptr_write(emu, TRIGGER_CHANNEL, 0, snd_emu10k1x_ptr_read(emu, TRIGGER_CHANNEL, 0)|(TRIGGER_CHANNEL_0<<channel));
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		epcm->running = 0;
		snd_emu10k1x_intr_disable(emu, (INTE_CH_0_LOOP | INTE_CH_0_HALF_LOOP) << channel);
		snd_emu10k1x_ptr_write(emu, TRIGGER_CHANNEL, 0, snd_emu10k1x_ptr_read(emu, TRIGGER_CHANNEL, 0) & ~(TRIGGER_CHANNEL_0<<channel));
		break;
	default:
		result = -EINVAL;
		break;
	}
	return result;
}

/* pointer callback */
static snd_pcm_uframes_t
snd_emu10k1x_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;
	int channel = epcm->voice->number;
	snd_pcm_uframes_t ptr = 0, ptr1 = 0, ptr2= 0,ptr3 = 0,ptr4 = 0;

	if (!epcm->running)
		return 0;

	ptr3 = snd_emu10k1x_ptr_read(emu, PLAYBACK_LIST_PTR, channel);
	ptr1 = snd_emu10k1x_ptr_read(emu, PLAYBACK_POINTER, channel);
	ptr4 = snd_emu10k1x_ptr_read(emu, PLAYBACK_LIST_PTR, channel);

	if(ptr4 == 0 && ptr1 == frames_to_bytes(runtime, runtime->buffer_size))
		return 0;
	
	if (ptr3 != ptr4) 
		ptr1 = snd_emu10k1x_ptr_read(emu, PLAYBACK_POINTER, channel);
	ptr2 = bytes_to_frames(runtime, ptr1);
	ptr2 += (ptr4 >> 3) * runtime->period_size;
	ptr = ptr2;

	if (ptr >= runtime->buffer_size)
		ptr -= runtime->buffer_size;

	return ptr;
}

/* operators */
static const struct snd_pcm_ops snd_emu10k1x_playback_ops = {
	.open =        snd_emu10k1x_playback_open,
	.close =       snd_emu10k1x_playback_close,
	.hw_params =   snd_emu10k1x_pcm_hw_params,
	.hw_free =     snd_emu10k1x_pcm_hw_free,
	.prepare =     snd_emu10k1x_pcm_prepare,
	.trigger =     snd_emu10k1x_pcm_trigger,
	.pointer =     snd_emu10k1x_pcm_pointer,
};

/* open_capture callback */
static int snd_emu10k1x_pcm_open_capture(struct snd_pcm_substream *substream)
{
	struct emu10k1x *chip = snd_pcm_substream_chip(substream);
	struct emu10k1x_pcm *epcm;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0)
		return err;
	err = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
	if (err < 0)
		return err;

	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
	if (epcm == NULL)
		return -ENOMEM;

	epcm->emu = chip;
	epcm->substream = substream;

	runtime->private_data = epcm;
	runtime->private_free = snd_emu10k1x_pcm_free_substream;

	runtime->hw = snd_emu10k1x_capture_hw;

	return 0;
}

/* close callback */
static int snd_emu10k1x_pcm_close_capture(struct snd_pcm_substream *substream)
{
	return 0;
}

/* hw_params callback */
static int snd_emu10k1x_pcm_hw_params_capture(struct snd_pcm_substream *substream,
					      struct snd_pcm_hw_params *hw_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;

	if (! epcm->voice) {
		if (epcm->emu->capture_voice.use)
			return -EBUSY;
		epcm->voice = &epcm->emu->capture_voice;
		epcm->voice->epcm = epcm;
		epcm->voice->use = 1;
	}

	return 0;
}

/* hw_free callback */
static int snd_emu10k1x_pcm_hw_free_capture(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	struct emu10k1x_pcm *epcm;

	if (runtime->private_data == NULL)
		return 0;
	epcm = runtime->private_data;

	if (epcm->voice) {
		epcm->voice->use = 0;
		epcm->voice->epcm = NULL;
		epcm->voice = NULL;
	}

	return 0;
}

/* prepare capture callback */
static int snd_emu10k1x_pcm_prepare_capture(struct snd_pcm_substream *substream)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_emu10k1x_ptr_write(emu, CAPTURE_DMA_ADDR, 0, runtime->dma_addr);
	snd_emu10k1x_ptr_write(emu, CAPTURE_BUFFER_SIZE, 0, frames_to_bytes(runtime, runtime->buffer_size)<<16); // buffer size in bytes
	snd_emu10k1x_ptr_write(emu, CAPTURE_POINTER, 0, 0);
	snd_emu10k1x_ptr_write(emu, CAPTURE_UNKNOWN, 0, 0);

	return 0;
}

/* trigger_capture callback */
static int snd_emu10k1x_pcm_trigger_capture(struct snd_pcm_substream *substream,
					    int cmd)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;
	int result = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_emu10k1x_intr_enable(emu, INTE_CAP_0_LOOP | 
					 INTE_CAP_0_HALF_LOOP);
		snd_emu10k1x_ptr_write(emu, TRIGGER_CHANNEL, 0, snd_emu10k1x_ptr_read(emu, TRIGGER_CHANNEL, 0)|TRIGGER_CAPTURE);
		epcm->running = 1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		epcm->running = 0;
		snd_emu10k1x_intr_disable(emu, INTE_CAP_0_LOOP | 
					  INTE_CAP_0_HALF_LOOP);
		snd_emu10k1x_ptr_write(emu, TRIGGER_CHANNEL, 0, snd_emu10k1x_ptr_read(emu, TRIGGER_CHANNEL, 0) & ~(TRIGGER_CAPTURE));
		break;
	default:
		result = -EINVAL;
		break;
	}
	return result;
}

/* pointer_capture callback */
static snd_pcm_uframes_t
snd_emu10k1x_pcm_pointer_capture(struct snd_pcm_substream *substream)
{
	struct emu10k1x *emu = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct emu10k1x_pcm *epcm = runtime->private_data;
	snd_pcm_uframes_t ptr;

	if (!epcm->running)
		return 0;

	ptr = bytes_to_frames(runtime, snd_emu10k1x_ptr_read(emu, CAPTURE_POINTER, 0));
	if (ptr >= runtime->buffer_size)
		ptr -= runtime->buffer_size;

	return ptr;
}

static const struct snd_pcm_ops snd_emu10k1x_capture_ops = {
	.open =        snd_emu10k1x_pcm_open_capture,
	.close =       snd_emu10k1x_pcm_close_capture,
	.hw_params =   snd_emu10k1x_pcm_hw_params_capture,
	.hw_free =     snd_emu10k1x_pcm_hw_free_capture,
	.prepare =     snd_emu10k1x_pcm_prepare_capture,
	.trigger =     snd_emu10k1x_pcm_trigger_capture,
	.pointer =     snd_emu10k1x_pcm_pointer_capture,
};

static unsigned short snd_emu10k1x_ac97_read(struct snd_ac97 *ac97,
					     unsigned short reg)
{
	struct emu10k1x *emu = ac97->private_data;
	unsigned long flags;
	unsigned short val;
  
	spin_lock_irqsave(&emu->emu_lock, flags);
	outb(reg, emu->port + AC97ADDRESS);
	val = inw(emu->port + AC97DATA);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
	return val;
}

static void snd_emu10k1x_ac97_write(struct snd_ac97 *ac97,
				    unsigned short reg, unsigned short val)
{
	struct emu10k1x *emu = ac97->private_data;
	unsigned long flags;
  
	spin_lock_irqsave(&emu->emu_lock, flags);
	outb(reg, emu->port + AC97ADDRESS);
	outw(val, emu->port + AC97DATA);
	spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static int snd_emu10k1x_ac97(struct emu10k1x *chip)
{
	struct snd_ac97_bus *pbus;
	struct snd_ac97_template ac97;
	int err;
	static const struct snd_ac97_bus_ops ops = {
		.write = snd_emu10k1x_ac97_write,
		.read = snd_emu10k1x_ac97_read,
	};
  
	err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus);
	if (err < 0)
		return err;
	pbus->no_vra = 1; /* we don't need VRA */

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = chip;
	ac97.scaps = AC97_SCAP_NO_SPDIF;
	return snd_ac97_mixer(pbus, &ac97, &chip->ac97);
}

static void snd_emu10k1x_free(struct snd_card *card)
{
	struct emu10k1x *chip = card->private_data;

	snd_emu10k1x_ptr_write(chip, TRIGGER_CHANNEL, 0, 0);
	// disable interrupts
	outl(0, chip->port + INTE);
	// disable audio
	outl(HCFG_LOCKSOUNDCACHE, chip->port + HCFG);
}

static irqreturn_t snd_emu10k1x_interrupt(int irq, void *dev_id)
{
	unsigned int status;

	struct emu10k1x *chip = dev_id;
	struct emu10k1x_voice *pvoice = chip->voices;
	int i;
	int mask;

	status = inl(chip->port + IPR);

	if (! status)
		return IRQ_NONE;

	// capture interrupt
	if (status & (IPR_CAP_0_LOOP | IPR_CAP_0_HALF_LOOP)) {
		struct emu10k1x_voice *cap_voice = &chip->capture_voice;
		if (cap_voice->use)
			snd_emu10k1x_pcm_interrupt(chip, cap_voice);
		else
			snd_emu10k1x_intr_disable(chip, 
						  INTE_CAP_0_LOOP |
						  INTE_CAP_0_HALF_LOOP);
	}
		
	mask = IPR_CH_0_LOOP|IPR_CH_0_HALF_LOOP;
	for (i = 0; i < 3; i++) {
		if (status & mask) {
			if (pvoice->use)
				snd_emu10k1x_pcm_interrupt(chip, pvoice);
			else 
				snd_emu10k1x_intr_disable(chip, mask);
		}
		pvoice++;
		mask <<= 1;
	}
		
	if (status & (IPR_MIDITRANSBUFEMPTY|IPR_MIDIRECVBUFEMPTY)) {
		if (chip->midi.interrupt)
			chip->midi.interrupt(chip, status);
		else
			snd_emu10k1x_intr_disable(chip, INTE_MIDITXENABLE|INTE_MIDIRXENABLE);
	}
		
	// acknowledge the interrupt if necessary
	outl(status, chip->port + IPR);

	/* dev_dbg(chip->card->dev, "interrupt %08x\n", status); */
	return IRQ_HANDLED;
}

static const struct snd_pcm_chmap_elem surround_map[] = {
	{ .channels = 2,
	  .map = { SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
	{ }
};

static const struct snd_pcm_chmap_elem clfe_map[] = {
	{ .channels = 2,
	  .map = { SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
	{ }
};

static int snd_emu10k1x_pcm(struct emu10k1x *emu, int device)
{
	struct snd_pcm *pcm;
	const struct snd_pcm_chmap_elem *map = NULL;
	int err;
	int capture = 0;
  
	if (device == 0)
		capture = 1;
	
	err = snd_pcm_new(emu->card, "emu10k1x", device, 1, capture, &pcm);
	if (err < 0)
		return err;
  
	pcm->private_data = emu;
	
	switch(device) {
	case 0:
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_emu10k1x_playback_ops);
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_emu10k1x_capture_ops);
		break;
	case 1:
	case 2:
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_emu10k1x_playback_ops);
		break;
	}

	pcm->info_flags = 0;
	switch(device) {
	case 0:
		strcpy(pcm->name, "EMU10K1X Front");
		map = snd_pcm_std_chmaps;
		break;
	case 1:
		strcpy(pcm->name, "EMU10K1X Rear");
		map = surround_map;
		break;
	case 2:
		strcpy(pcm->name, "EMU10K1X Center/LFE");
		map = clfe_map;
		break;
	}
	emu->pcm = pcm;

	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
				       &emu->pci->dev, 32*1024, 32*1024);
  
	return snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK, map, 2,
				     1 << 2, NULL);
}

static int snd_emu10k1x_create(struct snd_card *card,
			       struct pci_dev *pci)
{
	struct emu10k1x *chip = card->private_data;
	int err;
	int ch;

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

	if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(28)) < 0) {
		dev_err(card->dev, "error to set 28bit mask DMA\n");
		return -ENXIO;
	}

	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	spin_lock_init(&chip->emu_lock);
	spin_lock_init(&chip->voice_lock);
  
	err = pci_request_regions(pci, "EMU10K1X");
	if (err < 0)
		return err;
	chip->port = pci_resource_start(pci, 0);

	if (devm_request_irq(&pci->dev, pci->irq, snd_emu10k1x_interrupt,
			     IRQF_SHARED, KBUILD_MODNAME, chip)) {
		dev_err(card->dev, "cannot grab irq %d\n", pci->irq);
		return -EBUSY;
	}
	chip->irq = pci->irq;
	card->sync_irq = chip->irq;
	card->private_free = snd_emu10k1x_free;
  
	chip->dma_buffer = snd_devm_alloc_pages(&pci->dev, SNDRV_DMA_TYPE_DEV,
						4 * 1024);
	if (!chip->dma_buffer)
		return -ENOMEM;

	pci_set_master(pci);
	/* read revision & serial */
	chip->revision = pci->revision;
	pci_read_config_dword(pci, PCI_SUBSYSTEM_VENDOR_ID, &chip->serial);
	pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &chip->model);
	dev_info(card->dev, "Model %04x Rev %08x Serial %08x\n", chip->model,
		   chip->revision, chip->serial);

	outl(0, chip->port + INTE);	

	for(ch = 0; ch < 3; ch++) {
		chip->voices[ch].emu = chip;
		chip->voices[ch].number = ch;
	}

	/*
	 *  Init to 0x02109204 :
	 *  Clock accuracy    = 0     (1000ppm)
	 *  Sample Rate       = 2     (48kHz)
	 *  Audio Channel     = 1     (Left of 2)
	 *  Source Number     = 0     (Unspecified)
	 *  Generation Status = 1     (Original for Cat Code 12)
	 *  Cat Code          = 12    (Digital Signal Mixer)
	 *  Mode              = 0     (Mode 0)
	 *  Emphasis          = 0     (None)
	 *  CP                = 1     (Copyright unasserted)
	 *  AN                = 0     (Audio data)
	 *  P                 = 0     (Consumer)
	 */
	snd_emu10k1x_ptr_write(chip, SPCS0, 0,
			       chip->spdif_bits[0] = 
			       SPCS_CLKACCY_1000PPM | SPCS_SAMPLERATE_48 |
			       SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC |
			       SPCS_GENERATIONSTATUS | 0x00001200 |
			       0x00000000 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT);
	snd_emu10k1x_ptr_write(chip, SPCS1, 0,
			       chip->spdif_bits[1] = 
			       SPCS_CLKACCY_1000PPM | SPCS_SAMPLERATE_48 |
			       SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC |
			       SPCS_GENERATIONSTATUS | 0x00001200 |
			       0x00000000 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT);
	snd_emu10k1x_ptr_write(chip, SPCS2, 0,
			       chip->spdif_bits[2] = 
			       SPCS_CLKACCY_1000PPM | SPCS_SAMPLERATE_48 |
			       SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC |
			       SPCS_GENERATIONSTATUS | 0x00001200 |
			       0x00000000 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT);

	snd_emu10k1x_ptr_write(chip, SPDIF_SELECT, 0, 0x700); // disable SPDIF
	snd_emu10k1x_ptr_write(chip, ROUTING, 0, 0x1003F); // routing
	snd_emu10k1x_gpio_write(chip, 0x1080); // analog mode

	outl(HCFG_LOCKSOUNDCACHE|HCFG_AUDIOENABLE, chip->port+HCFG);

	return 0;
}

static void snd_emu10k1x_proc_reg_read(struct snd_info_entry *entry, 
				       struct snd_info_buffer *buffer)
{
	struct emu10k1x *emu = entry->private_data;
	unsigned long value,value1,value2;
	unsigned long flags;
	int i;

	snd_iprintf(buffer, "Registers:\n\n");
	for(i = 0; i < 0x20; i+=4) {
		spin_lock_irqsave(&emu->emu_lock, flags);
		value = inl(emu->port + i);
		spin_unlock_irqrestore(&emu->emu_lock, flags);
		snd_iprintf(buffer, "Register %02X: %08lX\n", i, value);
	}
	snd_iprintf(buffer, "\nRegisters\n\n");
	for(i = 0; i <= 0x48; i++) {
		value = snd_emu10k1x_ptr_read(emu, i, 0);
		if(i < 0x10 || (i >= 0x20 && i < 0x40)) {
			value1 = snd_emu10k1x_ptr_read(emu, i, 1);
			value2 = snd_emu10k1x_ptr_read(emu, i, 2);
			snd_iprintf(buffer, "%02X: %08lX %08lX %08lX\n", i, value, value1, value2);
		} else {
			snd_iprintf(buffer, "%02X: %08lX\n", i, value);
		}
	}
}

static void snd_emu10k1x_proc_reg_write(struct snd_info_entry *entry, 
					struct snd_info_buffer *buffer)
{
	struct emu10k1x *emu = entry->private_data;
	char line[64];
	unsigned int reg, channel_id , val;

	while (!snd_info_get_line(buffer, line, sizeof(line))) {
		if (sscanf(line, "%x %x %x", &reg, &channel_id, &val) != 3)
			continue;

		if (reg < 0x49 && channel_id <= 2)
			snd_emu10k1x_ptr_write(emu, reg, channel_id, val);
	}
}

static int snd_emu10k1x_proc_init(struct emu10k1x *emu)
{
	snd_card_rw_proc_new(emu->card, "emu10k1x_regs", emu,
			     snd_emu10k1x_proc_reg_read,
			     snd_emu10k1x_proc_reg_write);
	return 0;
}

#define snd_emu10k1x_shared_spdif_info	snd_ctl_boolean_mono_info

static int snd_emu10k1x_shared_spdif_get(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_value *ucontrol)
{
	struct emu10k1x *emu = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = (snd_emu10k1x_ptr_read(emu, SPDIF_SELECT, 0) == 0x700) ? 0 : 1;

	return 0;
}

static int snd_emu10k1x_shared_spdif_put(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_value *ucontrol)
{
	struct emu10k1x *emu = snd_kcontrol_chip(kcontrol);
	unsigned int val;

	val = ucontrol->value.integer.value[0] ;

	if (val) {
		// enable spdif output
		snd_emu10k1x_ptr_write(emu, SPDIF_SELECT, 0, 0x000);
		snd_emu10k1x_ptr_write(emu, ROUTING, 0, 0x700);
		snd_emu10k1x_gpio_write(emu, 0x1000);
	} else {
		// disable spdif output
		snd_emu10k1x_ptr_write(emu, SPDIF_SELECT, 0, 0x700);
		snd_emu10k1x_ptr_write(emu, ROUTING, 0, 0x1003F);
		snd_emu10k1x_gpio_write(emu, 0x1080);
	}
	return 0;
}

static const struct snd_kcontrol_new snd_emu10k1x_shared_spdif =
{
	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
	.name =		"Analog/Digital Output Jack",
	.info =		snd_emu10k1x_shared_spdif_info,
	.get =		snd_emu10k1x_shared_spdif_get,
	.put =		snd_emu10k1x_shared_spdif_put
};

static int snd_emu10k1x_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;
	return 0;
}

static int snd_emu10k1x_spdif_get(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_value *ucontrol)
{
	struct emu10k1x *emu = snd_kcontrol_chip(kcontrol);
	unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);

	ucontrol->value.iec958.status[0] = (emu->spdif_bits[idx] >> 0) & 0xff;
	ucontrol->value.iec958.status[1] = (emu->spdif_bits[idx] >> 8) & 0xff;
	ucontrol->value.iec958.status[2] = (emu->spdif_bits[idx] >> 16) & 0xff;
	ucontrol->value.iec958.status[3] = (emu->spdif_bits[idx] >> 24) & 0xff;
	return 0;
}

static int snd_emu10k1x_spdif_get_mask(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *ucontrol)
{
	ucontrol->value.iec958.status[0] = 0xff;
	ucontrol->value.iec958.status[1] = 0xff;
	ucontrol->value.iec958.status[2] = 0xff;
	ucontrol->value.iec958.status[3] = 0xff;
	return 0;
}

static int snd_emu10k1x_spdif_put(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_value *ucontrol)
{
	struct emu10k1x *emu = snd_kcontrol_chip(kcontrol);
	unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
	int change;
	unsigned int val;

	val = (ucontrol->value.iec958.status[0] << 0) |
		(ucontrol->value.iec958.status[1] << 8) |
		(ucontrol->value.iec958.status[2] << 16) |
		(ucontrol->value.iec958.status[3] << 24);
	change = val != emu->spdif_bits[idx];
	if (change) {
		snd_emu10k1x_ptr_write(emu, SPCS0 + idx, 0, val);
		emu->spdif_bits[idx] = val;
	}
	return change;
}

static const struct snd_kcontrol_new snd_emu10k1x_spdif_mask_control =
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
	.count =	3,
	.info =         snd_emu10k1x_spdif_info,
	.get =          snd_emu10k1x_spdif_get_mask
};

static const struct snd_kcontrol_new snd_emu10k1x_spdif_control =
{
	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
	.count =	3,
	.info =         snd_emu10k1x_spdif_info,
	.get =          snd_emu10k1x_spdif_get,
	.put =          snd_emu10k1x_spdif_put
};

static int snd_emu10k1x_mixer(struct emu10k1x *emu)
{
	int err;
	struct snd_kcontrol *kctl;
	struct snd_card *card = emu->card;

	kctl = snd_ctl_new1(&snd_emu10k1x_spdif_mask_control, emu);
	if (!kctl)
		return -ENOMEM;
	err = snd_ctl_add(card, kctl);
	if (err)
		return err;
	kctl = snd_ctl_new1(&snd_emu10k1x_shared_spdif, emu);
	if (!kctl)
		return -ENOMEM;
	err = snd_ctl_add(card, kctl);
	if (err)
		return err;
	kctl = snd_ctl_new1(&snd_emu10k1x_spdif_control, emu);
	if (!kctl)
		return -ENOMEM;
	err = snd_ctl_add(card, kctl);
	if (err)
		return err;

	return 0;
}

#define EMU10K1X_MIDI_MODE_INPUT	(1<<0)
#define EMU10K1X_MIDI_MODE_OUTPUT	(1<<1)

static inline unsigned char mpu401_read(struct emu10k1x *emu, struct emu10k1x_midi *mpu, int idx)
{
	return (unsigned char)snd_emu10k1x_ptr_read(emu, mpu->port + idx, 0);
}

static inline void mpu401_write(struct emu10k1x *emu, struct emu10k1x_midi *mpu, int data, int idx)
{
	snd_emu10k1x_ptr_write(emu, mpu->port + idx, 0, data);
}

#define mpu401_write_data(emu, mpu, data)	mpu401_write(emu, mpu, data, 0)
#define mpu401_write_cmd(emu, mpu, data)	mpu401_write(emu, mpu, data, 1)
#define mpu401_read_data(emu, mpu)		mpu401_read(emu, mpu, 0)
#define mpu401_read_stat(emu, mpu)		mpu401_read(emu, mpu, 1)

#define mpu401_input_avail(emu,mpu)	(!(mpu401_read_stat(emu,mpu) & 0x80))
#define mpu401_output_ready(emu,mpu)	(!(mpu401_read_stat(emu,mpu) & 0x40))

#define MPU401_RESET		0xff
#define MPU401_ENTER_UART	0x3f
#define MPU401_ACK		0xfe

static void mpu401_clear_rx(struct emu10k1x *emu, struct emu10k1x_midi *mpu)
{
	int timeout = 100000;
	for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--)
		mpu401_read_data(emu, mpu);
#ifdef CONFIG_SND_DEBUG
	if (timeout <= 0)
		dev_err(emu->card->dev,
			"cmd: clear rx timeout (status = 0x%x)\n",
			mpu401_read_stat(emu, mpu));
#endif
}

/*

 */

static void do_emu10k1x_midi_interrupt(struct emu10k1x *emu,
				       struct emu10k1x_midi *midi, unsigned int status)
{
	unsigned char byte;

	if (midi->rmidi == NULL) {
		snd_emu10k1x_intr_disable(emu, midi->tx_enable | midi->rx_enable);
		return;
	}

	spin_lock(&midi->input_lock);
	if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) {
		if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_INPUT)) {
			mpu401_clear_rx(emu, midi);
		} else {
			byte = mpu401_read_data(emu, midi);
			if (midi->substream_input)
				snd_rawmidi_receive(midi->substream_input, &byte, 1);
		}
	}
	spin_unlock(&midi->input_lock);

	spin_lock(&midi->output_lock);
	if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) {
		if (midi->substream_output &&
		    snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
			mpu401_write_data(emu, midi, byte);
		} else {
			snd_emu10k1x_intr_disable(emu, midi->tx_enable);
		}
	}
	spin_unlock(&midi->output_lock);
}

static void snd_emu10k1x_midi_interrupt(struct emu10k1x *emu, unsigned int status)
{
	do_emu10k1x_midi_interrupt(emu, &emu->midi, status);
}

static int snd_emu10k1x_midi_cmd(struct emu10k1x * emu,
				  struct emu10k1x_midi *midi, unsigned char cmd, int ack)
{
	unsigned long flags;
	int timeout, ok;

	spin_lock_irqsave(&midi->input_lock, flags);
	mpu401_write_data(emu, midi, 0x00);
	/* mpu401_clear_rx(emu, midi); */

	mpu401_write_cmd(emu, midi, cmd);
	if (ack) {
		ok = 0;
		timeout = 10000;
		while (!ok && timeout-- > 0) {
			if (mpu401_input_avail(emu, midi)) {
				if (mpu401_read_data(emu, midi) == MPU401_ACK)
					ok = 1;
			}
		}
		if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK)
			ok = 1;
	} else {
		ok = 1;
	}
	spin_unlock_irqrestore(&midi->input_lock, flags);
	if (!ok) {
		dev_err(emu->card->dev,
			"midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n",
			   cmd, emu->port,
			   mpu401_read_stat(emu, midi),
			   mpu401_read_data(emu, midi));
		return 1;
	}
	return 0;
}

static int snd_emu10k1x_midi_input_open(struct snd_rawmidi_substream *substream)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	unsigned long flags;
	
	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;
	spin_lock_irqsave(&midi->open_lock, flags);
	midi->midi_mode |= EMU10K1X_MIDI_MODE_INPUT;
	midi->substream_input = substream;
	if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_OUTPUT)) {
		spin_unlock_irqrestore(&midi->open_lock, flags);
		if (snd_emu10k1x_midi_cmd(emu, midi, MPU401_RESET, 1))
			goto error_out;
		if (snd_emu10k1x_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
			goto error_out;
	} else {
		spin_unlock_irqrestore(&midi->open_lock, flags);
	}
	return 0;

error_out:
	return -EIO;
}

static int snd_emu10k1x_midi_output_open(struct snd_rawmidi_substream *substream)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;
	spin_lock_irqsave(&midi->open_lock, flags);
	midi->midi_mode |= EMU10K1X_MIDI_MODE_OUTPUT;
	midi->substream_output = substream;
	if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_INPUT)) {
		spin_unlock_irqrestore(&midi->open_lock, flags);
		if (snd_emu10k1x_midi_cmd(emu, midi, MPU401_RESET, 1))
			goto error_out;
		if (snd_emu10k1x_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
			goto error_out;
	} else {
		spin_unlock_irqrestore(&midi->open_lock, flags);
	}
	return 0;

error_out:
	return -EIO;
}

static int snd_emu10k1x_midi_input_close(struct snd_rawmidi_substream *substream)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	unsigned long flags;
	int err = 0;

	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;
	spin_lock_irqsave(&midi->open_lock, flags);
	snd_emu10k1x_intr_disable(emu, midi->rx_enable);
	midi->midi_mode &= ~EMU10K1X_MIDI_MODE_INPUT;
	midi->substream_input = NULL;
	if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_OUTPUT)) {
		spin_unlock_irqrestore(&midi->open_lock, flags);
		err = snd_emu10k1x_midi_cmd(emu, midi, MPU401_RESET, 0);
	} else {
		spin_unlock_irqrestore(&midi->open_lock, flags);
	}
	return err;
}

static int snd_emu10k1x_midi_output_close(struct snd_rawmidi_substream *substream)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	unsigned long flags;
	int err = 0;

	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return -ENXIO;
	spin_lock_irqsave(&midi->open_lock, flags);
	snd_emu10k1x_intr_disable(emu, midi->tx_enable);
	midi->midi_mode &= ~EMU10K1X_MIDI_MODE_OUTPUT;
	midi->substream_output = NULL;
	if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_INPUT)) {
		spin_unlock_irqrestore(&midi->open_lock, flags);
		err = snd_emu10k1x_midi_cmd(emu, midi, MPU401_RESET, 0);
	} else {
		spin_unlock_irqrestore(&midi->open_lock, flags);
	}
	return err;
}

static void snd_emu10k1x_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return;

	if (up)
		snd_emu10k1x_intr_enable(emu, midi->rx_enable);
	else
		snd_emu10k1x_intr_disable(emu, midi->rx_enable);
}

static void snd_emu10k1x_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
	struct emu10k1x *emu;
	struct emu10k1x_midi *midi = substream->rmidi->private_data;
	unsigned long flags;

	emu = midi->emu;
	if (snd_BUG_ON(!emu))
		return;

	if (up) {
		int max = 4;
		unsigned char byte;
	
		/* try to send some amount of bytes here before interrupts */
		spin_lock_irqsave(&midi->output_lock, flags);
		while (max > 0) {
			if (mpu401_output_ready(emu, midi)) {
				if (!(midi->midi_mode & EMU10K1X_MIDI_MODE_OUTPUT) ||
				    snd_rawmidi_transmit(substream, &byte, 1) != 1) {
					/* no more data */
					spin_unlock_irqrestore(&midi->output_lock, flags);
					return;
				}
				mpu401_write_data(emu, midi, byte);
				max--;
			} else {
				break;
			}
		}
		spin_unlock_irqrestore(&midi->output_lock, flags);
		snd_emu10k1x_intr_enable(emu, midi->tx_enable);
	} else {
		snd_emu10k1x_intr_disable(emu, midi->tx_enable);
	}
}

/*

 */

static const struct snd_rawmidi_ops snd_emu10k1x_midi_output =
{
	.open =		snd_emu10k1x_midi_output_open,
	.close =	snd_emu10k1x_midi_output_close,
	.trigger =	snd_emu10k1x_midi_output_trigger,
};

static const struct snd_rawmidi_ops snd_emu10k1x_midi_input =
{
	.open =		snd_emu10k1x_midi_input_open,
	.close =	snd_emu10k1x_midi_input_close,
	.trigger =	snd_emu10k1x_midi_input_trigger,
};

static void snd_emu10k1x_midi_free(struct snd_rawmidi *rmidi)
{
	struct emu10k1x_midi *midi = rmidi->private_data;
	midi->interrupt = NULL;
	midi->rmidi = NULL;
}

static int emu10k1x_midi_init(struct emu10k1x *emu,
			      struct emu10k1x_midi *midi, int device,
			      char *name)
{
	struct snd_rawmidi *rmidi;
	int err;

	err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi);
	if (err < 0)
		return err;
	midi->emu = emu;
	spin_lock_init(&midi->open_lock);
	spin_lock_init(&midi->input_lock);
	spin_lock_init(&midi->output_lock);
	strcpy(rmidi->name, name);
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1x_midi_output);
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1x_midi_input);
	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
	                     SNDRV_RAWMIDI_INFO_INPUT |
	                     SNDRV_RAWMIDI_INFO_DUPLEX;
	rmidi->private_data = midi;
	rmidi->private_free = snd_emu10k1x_midi_free;
	midi->rmidi = rmidi;
	return 0;
}

static int snd_emu10k1x_midi(struct emu10k1x *emu)
{
	struct emu10k1x_midi *midi = &emu->midi;
	int err;

	err = emu10k1x_midi_init(emu, midi, 0, "EMU10K1X MPU-401 (UART)");
	if (err < 0)
		return err;

	midi->tx_enable = INTE_MIDITXENABLE;
	midi->rx_enable = INTE_MIDIRXENABLE;
	midi->port = MUDATA;
	midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
	midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
	midi->interrupt = snd_emu10k1x_midi_interrupt;
	return 0;
}

static int __snd_emu10k1x_probe(struct pci_dev *pci,
				const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct emu10k1x *chip;
	int 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;

	err = snd_emu10k1x_create(card, pci);
	if (err < 0)
		return err;

	err = snd_emu10k1x_pcm(chip, 0);
	if (err < 0)
		return err;
	err = snd_emu10k1x_pcm(chip, 1);
	if (err < 0)
		return err;
	err = snd_emu10k1x_pcm(chip, 2);
	if (err < 0)
		return err;

	err = snd_emu10k1x_ac97(chip);
	if (err < 0)
		return err;

	err = snd_emu10k1x_mixer(chip);
	if (err < 0)
		return err;
	
	err = snd_emu10k1x_midi(chip);
	if (err < 0)
		return err;

	snd_emu10k1x_proc_init(chip);

	strcpy(card->driver, "EMU10K1X");
	strcpy(card->shortname, "Dell Sound Blaster Live!");
	sprintf(card->longname, "%s at 0x%lx irq %i",
		card->shortname, chip->port, chip->irq);

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

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

static int snd_emu10k1x_probe(struct pci_dev *pci,
			      const struct pci_device_id *pci_id)
{
	return snd_card_free_on_error(&pci->dev, __snd_emu10k1x_probe(pci, pci_id));
}

// PCI IDs
static const struct pci_device_id snd_emu10k1x_ids[] = {
	{ PCI_VDEVICE(CREATIVE, 0x0006), 0 },	/* Dell OEM version (EMU10K1) */
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, snd_emu10k1x_ids);

// pci_driver definition
static struct pci_driver emu10k1x_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_emu10k1x_ids,
	.probe = snd_emu10k1x_probe,
};

module_pci_driver(emu10k1x_driver);