summaryrefslogtreecommitdiffstats
path: root/sound/pci/via82xx_modem.c
blob: 31f64ee398820c62ffb8c9b51318a2c4e122e9b0 (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
/*
 *   ALSA modem driver for VIA VT82xx (South Bridge)
 *
 *   VT82C686A/B/C, VT8233A/C, VT8235
 *
 *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
 *	                   Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
 *                    2002 Takashi Iwai <tiwai@suse.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

/*
 * Changes:
 *
 * Sep. 2,  2004  Sasha Khapyorsky <sashak@alsa-project.org>
 *      Modified from original audio driver 'via82xx.c' to support AC97
 *      modems.
 */

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

#if 0
#define POINTER_DEBUG
#endif

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

static int index = -2; /* Exclude the first card */
static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
static int ac97_clock = 48000;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");

/* just for backward compatibility */
static int enable;
module_param(enable, bool, 0444);


/*
 *  Direct registers
 */

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

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

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

/* modem block */
DEFINE_VIA_REGSET(MO, 0x40);
DEFINE_VIA_REGSET(MI, 0x50);

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

#define VIA_REG_SGD_SHADOW		0x84	/* dword */
#define   VIA_REG_SGD_STAT_PB_FLAG	(1<<0)
#define   VIA_REG_SGD_STAT_CP_FLAG	(1<<1)
#define   VIA_REG_SGD_STAT_FM_FLAG	(1<<2)
#define   VIA_REG_SGD_STAT_PB_EOL	(1<<4)
#define   VIA_REG_SGD_STAT_CP_EOL	(1<<5)
#define   VIA_REG_SGD_STAT_FM_EOL	(1<<6)
#define   VIA_REG_SGD_STAT_PB_STOP	(1<<8)
#define   VIA_REG_SGD_STAT_CP_STOP	(1<<9)
#define   VIA_REG_SGD_STAT_FM_STOP	(1<<10)
#define   VIA_REG_SGD_STAT_PB_ACTIVE	(1<<12)
#define   VIA_REG_SGD_STAT_CP_ACTIVE	(1<<13)
#define   VIA_REG_SGD_STAT_FM_ACTIVE	(1<<14)
#define   VIA_REG_SGD_STAT_MR_FLAG      (1<<16)
#define   VIA_REG_SGD_STAT_MW_FLAG      (1<<17)
#define   VIA_REG_SGD_STAT_MR_EOL       (1<<20)
#define   VIA_REG_SGD_STAT_MW_EOL       (1<<21)
#define   VIA_REG_SGD_STAT_MR_STOP      (1<<24)
#define   VIA_REG_SGD_STAT_MW_STOP      (1<<25)
#define   VIA_REG_SGD_STAT_MR_ACTIVE    (1<<28)
#define   VIA_REG_SGD_STAT_MW_ACTIVE    (1<<29)

#define VIA_REG_GPI_STATUS		0x88
#define VIA_REG_GPI_INTR		0x8c

#define VIA_TBL_BIT_FLAG	0x40000000
#define VIA_TBL_BIT_EOL		0x80000000

/* pci space */
#define VIA_ACLINK_STAT		0x40
#define  VIA_ACLINK_C11_READY	0x20
#define  VIA_ACLINK_C10_READY	0x10
#define  VIA_ACLINK_C01_READY	0x04 /* secondary codec ready */
#define  VIA_ACLINK_LOWPOWER	0x02 /* low-power state */
#define  VIA_ACLINK_C00_READY	0x01 /* primary codec ready */
#define VIA_ACLINK_CTRL		0x41
#define  VIA_ACLINK_CTRL_ENABLE	0x80 /* 0: disable, 1: enable */
#define  VIA_ACLINK_CTRL_RESET	0x40 /* 0: assert, 1: de-assert */
#define  VIA_ACLINK_CTRL_SYNC	0x20 /* 0: release SYNC, 1: force SYNC hi */
#define  VIA_ACLINK_CTRL_SDO	0x10 /* 0: release SDO, 1: force SDO hi */
#define  VIA_ACLINK_CTRL_VRA	0x08 /* 0: disable VRA, 1: enable VRA */
#define  VIA_ACLINK_CTRL_PCM	0x04 /* 0: disable PCM, 1: enable PCM */
#define  VIA_ACLINK_CTRL_FM	0x02 /* via686 only */
#define  VIA_ACLINK_CTRL_SB	0x01 /* via686 only */
#define  VIA_ACLINK_CTRL_INIT	(VIA_ACLINK_CTRL_ENABLE|\
				 VIA_ACLINK_CTRL_RESET|\
				 VIA_ACLINK_CTRL_PCM)
#define VIA_FUNC_ENABLE		0x42
#define  VIA_FUNC_MIDI_PNP	0x80 /* FIXME: it's 0x40 in the datasheet! */
#define  VIA_FUNC_MIDI_IRQMASK	0x40 /* FIXME: not documented! */
#define  VIA_FUNC_RX2C_WRITE	0x20
#define  VIA_FUNC_SB_FIFO_EMPTY	0x10
#define  VIA_FUNC_ENABLE_GAME	0x08
#define  VIA_FUNC_ENABLE_FM	0x04
#define  VIA_FUNC_ENABLE_MIDI	0x02
#define  VIA_FUNC_ENABLE_SB	0x01
#define VIA_PNP_CONTROL		0x43
#define VIA_MC97_CTRL		0x44
#define  VIA_MC97_CTRL_ENABLE   0x80
#define  VIA_MC97_CTRL_SECONDARY 0x40
#define  VIA_MC97_CTRL_INIT     (VIA_MC97_CTRL_ENABLE|\
                                 VIA_MC97_CTRL_SECONDARY)


/*
 * pcm stream
 */

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

#define VIA_TABLE_SIZE	255

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

enum { TYPE_CARD_VIA82XX_MODEM = 1 };

#define VIA_MAX_MODEM_DEVS	2

struct via82xx_modem {
	int irq;

	unsigned long port;

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

	struct pci_dev *pci;
	struct snd_card *card;

	unsigned int num_devs;
	unsigned int playback_devno, capture_devno;
	struct viadev devs[VIA_MAX_MODEM_DEVS];

	struct snd_pcm *pcms[2];

	struct snd_ac97_bus *ac97_bus;
	struct snd_ac97 *ac97;
	unsigned int ac97_clock;
	unsigned int ac97_secondary;	/* secondary AC'97 codec is present */

	spinlock_t reg_lock;
	struct snd_info_entry *proc_entry;
};

static struct pci_device_id snd_via82xx_modem_ids[] = {
	{ 0x1106, 0x3068, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA82XX_MODEM, },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_via82xx_modem_ids);

/*
 */

/*
 * allocate and initialize the descriptor buffers
 * periods = number of periods
 * fragsize = period size in bytes
 */
static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
			   struct pci_dev *pci,
			   unsigned int periods, unsigned int fragsize)
{
	unsigned int i, idx, ofs, rest;
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);

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

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

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


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

/*
 *  Basic I/O
 */

static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
{
	return inl(VIAREG(chip, AC97));
}
 
static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
{
	outl(val, VIAREG(chip, AC97));
}
 
static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
{
	unsigned int timeout = 1000;	/* 1ms */
	unsigned int val;
	
	while (timeout-- > 0) {
		udelay(1);
		if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
			return val & 0xffff;
	}
	snd_printk(KERN_ERR "codec_ready: codec %i is not ready [0x%x]\n",
		   secondary, snd_via82xx_codec_xread(chip));
	return -EIO;
}
 
static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
{
	unsigned int timeout = 1000;	/* 1ms */
	unsigned int val, val1;
	unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
					 VIA_REG_AC97_SECONDARY_VALID;
	
	while (timeout-- > 0) {
		val = snd_via82xx_codec_xread(chip);
		val1 = val & (VIA_REG_AC97_BUSY | stat);
		if (val1 == stat)
			return val & 0xffff;
		udelay(1);
	}
	return -EIO;
}
 
static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
{
	struct via82xx_modem *chip = ac97->private_data;
	int err;
	err = snd_via82xx_codec_ready(chip, ac97->num);
	/* here we need to wait fairly for long time.. */
	msleep(500);
}

static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
				    unsigned short reg,
				    unsigned short val)
{
	struct via82xx_modem *chip = ac97->private_data;
	unsigned int xval;
	if(reg == AC97_GPIO_STATUS) {
		outl(val, VIAREG(chip, GPI_STATUS));
		return;
	}	
	xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
	xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
	xval |= reg << VIA_REG_AC97_CMD_SHIFT;
	xval |= val << VIA_REG_AC97_DATA_SHIFT;
	snd_via82xx_codec_xwrite(chip, xval);
	snd_via82xx_codec_ready(chip, ac97->num);
}

static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
{
	struct via82xx_modem *chip = ac97->private_data;
	unsigned int xval, val = 0xffff;
	int again = 0;

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

static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
{
	outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
	     VIADEV_REG(viadev, OFFSET_CONTROL));
	inb(VIADEV_REG(viadev, OFFSET_CONTROL));
	udelay(50);
	/* disable interrupts */
	outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
	/* clear interrupts */
	outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
	outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
	// outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
	viadev->lastpos = 0;
}


/*
 *  Interrupt handler
 */

static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
{
	struct via82xx_modem *chip = dev_id;
	unsigned int status;
	unsigned int i;

	status = inl(VIAREG(chip, SGD_SHADOW));
	if (! (status & chip->intr_mask)) {
		return IRQ_NONE;
	}
// _skip_sgd:

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

/*
 *  PCM callbacks
 */

/*
 * trigger callback
 */
static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = substream->runtime->private_data;
	unsigned char val = 0;

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

/*
 * pointer callbacks
 */

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

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

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

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

	/* check the validity of the calculated position */
	if (size < count) {
		snd_printd(KERN_ERR "invalid via82xx_cur_ptr (size = %d, count = %d)\n",
			   (int)size, (int)count);
		res = viadev->lastpos;
	} else if (check_invalid_pos(viadev, res)) {
#ifdef POINTER_DEBUG
		printk(KERN_DEBUG "fail: idx = %i/%i, lastpos = 0x%x, "
		       "bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, "
		       "count = 0x%x\n", idx, viadev->tbl_entries, viadev->lastpos,
		       viadev->bufsize2, viadev->idx_table[idx].offset,
		       viadev->idx_table[idx].size, count);
#endif
		if (count && size < count) {
			snd_printd(KERN_ERR "invalid via82xx_cur_ptr, "
				   "using last valid pointer\n");
			res = viadev->lastpos;
		} else {
			if (! count)
				/* bogus count 0 on the DMA boundary? */
				res = viadev->idx_table[idx].offset;
			else
				/* count register returns full size
				 * when end of buffer is reached
				 */
				res = viadev->idx_table[idx].offset + size;
			if (check_invalid_pos(viadev, res)) {
				snd_printd(KERN_ERR "invalid via82xx_cur_ptr (2), "
					   "using last valid pointer\n");
				res = viadev->lastpos;
			}
		}
	}
	viadev->lastpos = res; /* remember the last position */
	if (res >= viadev->bufsize)
		res -= viadev->bufsize;
	return res;
}

/*
 * get the current pointer on via686
 */
static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = substream->runtime->private_data;
	unsigned int idx, ptr, count, res;

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

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

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

/*
 * hw_params callback:
 * allocate the buffer and build up the buffer description table
 */
static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = substream->runtime->private_data;
	int err;

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

	snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
	snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);

	return 0;
}

/*
 * hw_free callback:
 * clean up the buffer description table and release the buffer
 */
static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = substream->runtime->private_data;

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


/*
 * set up the table pointer
 */
static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
{
	snd_via82xx_codec_ready(chip, chip->ac97_secondary);
	outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
	udelay(20);
	snd_via82xx_codec_ready(chip, chip->ac97_secondary);
}

/*
 * prepare callback for playback and capture
 */
static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = substream->runtime->private_data;

	snd_via82xx_channel_reset(chip, viadev);
	/* this must be set after channel_reset */
	snd_via82xx_set_table_ptr(chip, viadev);
	outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
	     VIADEV_REG(viadev, OFFSET_TYPE));
	return 0;
}

/*
 * pcm hardware definition, identical for both playback and capture
 */
static struct snd_pcm_hardware snd_via82xx_hw =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID |
				 /* SNDRV_PCM_INFO_RESUME | */
				 SNDRV_PCM_INFO_PAUSE),
	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
	.rate_min =		8000,
	.rate_max =		16000,
	.channels_min =		1,
	.channels_max =		1,
	.buffer_bytes_max =	128 * 1024,
	.period_bytes_min =	32,
	.period_bytes_max =	128 * 1024,
	.periods_min =		2,
	.periods_max =		VIA_TABLE_SIZE / 2,
	.fifo_size =		0,
};


/*
 * open callback skeleton
 */
static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
				      struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;
        static unsigned int rates[] = { 8000,  9600, 12000, 16000 };
        static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
                .count = ARRAY_SIZE(rates),
                .list = rates,
                .mask = 0,
        };

	runtime->hw = snd_via82xx_hw;
	
        if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					      &hw_constraints_rates)) < 0)
                return err;

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

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

	return 0;
}


/*
 * open callback for playback
 */
static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];

	return snd_via82xx_modem_pcm_open(chip, viadev, substream);
}

/*
 * open callback for capture
 */
static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
{
	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
	struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];

	return snd_via82xx_modem_pcm_open(chip, viadev, substream);
}

/*
 * close callback
 */
static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct viadev *viadev = substream->runtime->private_data;

	viadev->substream = NULL;
	return 0;
}


/* via686 playback callbacks */
static struct snd_pcm_ops snd_via686_playback_ops = {
	.open =		snd_via82xx_playback_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via82xx_pcm_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via686_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};

/* via686 capture callbacks */
static struct snd_pcm_ops snd_via686_capture_ops = {
	.open =		snd_via82xx_capture_open,
	.close =	snd_via82xx_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_via82xx_hw_params,
	.hw_free =	snd_via82xx_hw_free,
	.prepare =	snd_via82xx_pcm_prepare,
	.trigger =	snd_via82xx_pcm_trigger,
	.pointer =	snd_via686_pcm_pointer,
	.page =		snd_pcm_sgbuf_ops_page,
};


static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
			int direction)
{
	chip->devs[idx].reg_offset = reg_offset;
	chip->devs[idx].direction = direction;
	chip->devs[idx].port = chip->port + reg_offset;
}

/*
 * create a pcm instance for via686a/b
 */
static int __devinit snd_via686_pcm_new(struct via82xx_modem *chip)
{
	struct snd_pcm *pcm;
	int err;

	chip->playback_devno = 0;
	chip->capture_devno = 1;
	chip->num_devs = 2;
	chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */

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

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

	return 0;
}


/*
 *  Mixer part
 */


static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
	struct via82xx_modem *chip = bus->private_data;
	chip->ac97_bus = NULL;
}

static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
{
	struct via82xx_modem *chip = ac97->private_data;
	chip->ac97 = NULL;
}


static int __devinit snd_via82xx_mixer_new(struct via82xx_modem *chip)
{
	struct snd_ac97_template ac97;
	int err;
	static struct snd_ac97_bus_ops ops = {
		.write = snd_via82xx_codec_write,
		.read = snd_via82xx_codec_read,
		.wait = snd_via82xx_codec_wait,
	};

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

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = chip;
	ac97.private_free = snd_via82xx_mixer_free_ac97;
	ac97.pci = chip->pci;
	ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
	ac97.num = chip->ac97_secondary;

	if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
		return err;

	return 0;
}


/*
 * proc interface
 */
static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
	struct via82xx_modem *chip = entry->private_data;
	int i;
	
	snd_iprintf(buffer, "%s\n\n", chip->card->longname);
	for (i = 0; i < 0xa0; i += 4) {
		snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
	}
}

static void __devinit snd_via82xx_proc_init(struct via82xx_modem *chip)
{
	struct snd_info_entry *entry;

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

/*
 *
 */

static int snd_via82xx_chip_init(struct via82xx_modem *chip)
{
	unsigned int val;
	unsigned long end_time;
	unsigned char pval;

	pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
	if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
		pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
		udelay(100);
	}

	pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
	if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
		/* deassert ACLink reset, force SYNC */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
				      VIA_ACLINK_CTRL_ENABLE |
				      VIA_ACLINK_CTRL_RESET |
				      VIA_ACLINK_CTRL_SYNC);
		udelay(100);
#if 1 /* FIXME: should we do full reset here for all chip models? */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
		udelay(100);
#else
		/* deassert ACLink reset, force SYNC (warm AC'97 reset) */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
				      VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
		udelay(2);
#endif
		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
		udelay(100);
	}
	
	pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
	if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
		udelay(100);
	}

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

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

	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
				 VIA_REG_AC97_SECONDARY_VALID |
				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
	end_time = jiffies + msecs_to_jiffies(750);
	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
				 VIA_REG_AC97_SECONDARY_VALID |
				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
	do {
		if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
			chip->ac97_secondary = 1;
			goto __ac97_ok2;
		}
		schedule_timeout_uninterruptible(1);
	} while (time_before(jiffies, end_time));
	/* This is ok, the most of motherboards have only one codec */

      __ac97_ok2:

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

	return 0;
}

#ifdef CONFIG_PM
/*
 * power management
 */
static int snd_via82xx_suspend(struct pci_dev *pci, pm_message_t state)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct via82xx_modem *chip = card->private_data;
	int i;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	for (i = 0; i < 2; i++)
		snd_pcm_suspend_all(chip->pcms[i]);
	for (i = 0; i < chip->num_devs; i++)
		snd_via82xx_channel_reset(chip, &chip->devs[i]);
	synchronize_irq(chip->irq);
	snd_ac97_suspend(chip->ac97);

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

static int snd_via82xx_resume(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct via82xx_modem *chip = card->private_data;
	int i;

	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		printk(KERN_ERR "via82xx-modem: pci_enable_device failed, "
		       "disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);

	snd_via82xx_chip_init(chip);

	snd_ac97_resume(chip->ac97);

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

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

static int snd_via82xx_free(struct via82xx_modem *chip)
{
	unsigned int i;

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

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

static int snd_via82xx_dev_free(struct snd_device *device)
{
	struct via82xx_modem *chip = device->device_data;
	return snd_via82xx_free(chip);
}

static int __devinit snd_via82xx_create(struct snd_card *card,
					struct pci_dev *pci,
					int chip_type,
					int revision,
					unsigned int ac97_clock,
					struct via82xx_modem ** r_via)
{
	struct via82xx_modem *chip;
	int err;
        static struct snd_device_ops ops = {
		.dev_free =	snd_via82xx_dev_free,
        };

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

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

	spin_lock_init(&chip->reg_lock);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

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

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

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

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

	snd_card_set_dev(card, &pci->dev);

	*r_via = chip;
	return 0;
}


static int __devinit snd_via82xx_probe(struct pci_dev *pci,
				       const struct pci_device_id *pci_id)
{
	struct snd_card *card;
	struct via82xx_modem *chip;
	int chip_type = 0, card_type;
	unsigned int i;
	int err;

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

	card_type = pci_id->driver_data;
	switch (card_type) {
	case TYPE_CARD_VIA82XX_MODEM:
		strcpy(card->driver, "VIA82XX-MODEM");
		sprintf(card->shortname, "VIA 82XX modem");
		break;
	default:
		snd_printk(KERN_ERR "invalid card type %d\n", card_type);
		err = -EINVAL;
		goto __error;
	}
		
	if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
				      ac97_clock, &chip)) < 0)
		goto __error;
	card->private_data = chip;
	if ((err = snd_via82xx_mixer_new(chip)) < 0)
		goto __error;

	if ((err = snd_via686_pcm_new(chip)) < 0 )
		goto __error;

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

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

	snd_via82xx_proc_init(chip);

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

 __error:
	snd_card_free(card);
	return err;
}

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

static struct pci_driver driver = {
	.name = "VIA 82xx Modem",
	.id_table = snd_via82xx_modem_ids,
	.probe = snd_via82xx_probe,
	.remove = __devexit_p(snd_via82xx_remove),
#ifdef CONFIG_PM
	.suspend = snd_via82xx_suspend,
	.resume = snd_via82xx_resume,
#endif
};

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

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

module_init(alsa_card_via82xx_init)
module_exit(alsa_card_via82xx_exit)