aboutsummaryrefslogtreecommitdiffstats
path: root/sound/oss/ad1889.c
blob: f0724327493c0c47e66a822e009ee0602c064a9b (plain) (blame)
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
/*
 *  Copyright 2001-2004 Randolph Chung <tausq@debian.org>
 *
 *  Analog Devices 1889 PCI audio driver (AD1819 AC97-compatible codec)
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *   Notes:
 *   1. Only flat DMA is supported; s-g is not supported right now
 *
 *
<jsm> tausq: Anyway, to set up sample rates for D to A, you just use the sample rate on the codec. For A to D, you need to set the codec always to 48K (using the split sample rate feature on the codec) and then set the resampler on the AD1889 to the sample rate you want.
<jsm> Also, when changing the sample rate on the codec you need to power it down and re power it up for the change to take effect!
 *
 * $Id: ad1889.c,v 1.3 2002/10/19 21:31:44 grundler Exp $
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/soundcard.h>
#include <linux/ac97_codec.h>
#include <linux/sound.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>

#include <asm/delay.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>

#include "ad1889.h"

#define DBG(fmt, arg...) printk(fmt, ##arg)
#define DEVNAME "ad1889"

#define NR_HW_CH	4
#define DAC_RUNNING	1
#define ADC_RUNNING	2

#define UNDERRUN(dev)	(0)

#define AD1889_READW(dev,reg) readw(dev->regbase + reg)
#define AD1889_WRITEW(dev,reg,val) writew((val), dev->regbase + reg)
#define AD1889_READL(dev,reg) readl(dev->regbase + reg)
#define AD1889_WRITEL(dev,reg,val) writel((val), dev->regbase + reg)

//now 100ms
/* #define WAIT_10MS()	schedule_timeout(HZ/10) */
#define WAIT_10MS()	do { int __i; for (__i = 0; __i < 100; __i++) udelay(1000); } while(0)

/* currently only support a single device */
static ad1889_dev_t *ad1889_dev = NULL;

/************************* helper routines ***************************** */
static inline void ad1889_set_wav_rate(ad1889_dev_t *dev, int rate)
{
	struct ac97_codec *ac97_codec = dev->ac97_codec;

	DBG("Setting WAV rate to %d\n", rate);
	dev->state[AD_WAV_STATE].dmabuf.rate = rate;
	AD1889_WRITEW(dev, AD_DS_WAS, rate);

	/* Cycle the DAC to enable the new rate */
	ac97_codec->codec_write(dev->ac97_codec, AC97_POWER_CONTROL, 0x0200);
	WAIT_10MS();
	ac97_codec->codec_write(dev->ac97_codec, AC97_POWER_CONTROL, 0);
}

static inline void ad1889_set_wav_fmt(ad1889_dev_t *dev, int fmt)
{
	u16 tmp;

	DBG("Setting WAV format to 0x%x\n", fmt);

	tmp = AD1889_READW(ad1889_dev, AD_DS_WSMC);
	if (fmt & AFMT_S16_LE) {
		//tmp |= 0x0100; /* set WA16 */
		tmp |= 0x0300; /* set WA16 stereo */
	} else if (fmt & AFMT_U8) {
		tmp &= ~0x0100; /* clear WA16 */
	} 
	AD1889_WRITEW(ad1889_dev, AD_DS_WSMC, tmp);
}

static inline void ad1889_set_adc_fmt(ad1889_dev_t *dev, int fmt)
{
	u16 tmp;

	DBG("Setting ADC format to 0x%x\n", fmt);

	tmp = AD1889_READW(ad1889_dev, AD_DS_RAMC);
	if (fmt & AFMT_S16_LE) {
		tmp |= 0x0100; /* set WA16 */
	} else if (fmt & AFMT_U8) {
		tmp &= ~0x0100; /* clear WA16 */
	} 
	AD1889_WRITEW(ad1889_dev, AD_DS_RAMC, tmp);
}

static void ad1889_start_wav(ad1889_state_t *state)
{
	unsigned long flags;
	struct dmabuf *dmabuf = &state->dmabuf;
	int cnt;
	u16 tmp;

	spin_lock_irqsave(&state->card->lock, flags);

	if (dmabuf->dma_len)	/* DMA already in flight */
		goto skip_dma;

	/* setup dma */
	cnt = dmabuf->wr_ptr - dmabuf->rd_ptr;
	if (cnt == 0)		/* done - don't need to do anything */
		goto skip_dma;

	/* If the wr_ptr has wrapped, only map to the end */
	if (cnt < 0)
		cnt = DMA_SIZE - dmabuf->rd_ptr;

	dmabuf->dma_handle = pci_map_single(ad1889_dev->pci,
					dmabuf->rawbuf + dmabuf->rd_ptr,
					cnt, PCI_DMA_TODEVICE);
	dmabuf->dma_len = cnt;
	dmabuf->ready = 1;

	DBG("Starting playback at 0x%p for %ld bytes\n", dmabuf->rawbuf +
	    dmabuf->rd_ptr, dmabuf->dma_len);

        /* load up the current register set */
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVCC, cnt);
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVICC, cnt);
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVCA, dmabuf->dma_handle);

	/* TODO: for now we load the base registers with the same thing */
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVBC, cnt);
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVIBC, cnt);
	AD1889_WRITEL(ad1889_dev, AD_DMA_WAVBA, dmabuf->dma_handle);

	/* and we're off to the races... */
	AD1889_WRITEL(ad1889_dev, AD_DMA_CHSS, 0x8);
	tmp = AD1889_READW(ad1889_dev, AD_DS_WSMC);
	tmp |= 0x0400; /* set WAEN */
	AD1889_WRITEW(ad1889_dev, AD_DS_WSMC, tmp);
	(void) AD1889_READW(ad1889_dev, AD_DS_WSMC); /* flush posted PCI write */

	dmabuf->enable |= DAC_RUNNING;

skip_dma:
	spin_unlock_irqrestore(&state->card->lock, flags);
}


static void ad1889_stop_wav(ad1889_state_t *state)
{
	unsigned long flags;
	struct dmabuf *dmabuf = &state->dmabuf;

	spin_lock_irqsave(&state->card->lock, flags);

	if (dmabuf->enable & DAC_RUNNING) {
		u16 tmp;
		unsigned long cnt = dmabuf->dma_len;

		tmp = AD1889_READW(ad1889_dev, AD_DS_WSMC);
		tmp &= ~0x0400; /* clear WAEN */
		AD1889_WRITEW(ad1889_dev, AD_DS_WSMC, tmp);
		(void) AD1889_READW(ad1889_dev, AD_DS_WSMC); /* flush posted PCI write */
		pci_unmap_single(ad1889_dev->pci, dmabuf->dma_handle, 
				cnt, PCI_DMA_TODEVICE);

		dmabuf->enable &= ~DAC_RUNNING;

		/* update dma pointers */
		dmabuf->rd_ptr += cnt;
		dmabuf->rd_ptr &= (DMA_SIZE - 1);

		dmabuf->dma_handle = 0;
		dmabuf->dma_len = 0;
		dmabuf->ready = 0;

		wake_up(&dmabuf->wait);
	}

	spin_unlock_irqrestore(&state->card->lock, flags);
}


#if 0
static void ad1889_startstop_adc(ad1889_state_t *state, int start)
{
	u16 tmp;
	unsigned long flags;

	spin_lock_irqsave(&state->card->lock, flags);
	
	tmp = AD1889_READW(ad1889_dev, AD_DS_RAMC);
	if (start) {
		state->dmabuf.enable |= ADC_RUNNING;
		tmp |= 0x0004; /* set ADEN */
	} else {
		state->dmabuf.enable &= ~ADC_RUNNING;
		tmp &= ~0x0004; /* clear ADEN */
	}
	AD1889_WRITEW(ad1889_dev, AD_DS_RAMC, tmp);

	spin_unlock_irqrestore(&state->card->lock, flags);
}
#endif

static ad1889_dev_t *ad1889_alloc_dev(struct pci_dev *pci)
{
	ad1889_dev_t *dev;
	struct dmabuf *dmabuf;
	int i;

	if ((dev = kmalloc(sizeof(ad1889_dev_t), GFP_KERNEL)) == NULL) 
		return NULL;
	memset(dev, 0, sizeof(ad1889_dev_t));
	spin_lock_init(&dev->lock);
	dev->pci = pci;

	for (i = 0; i < AD_MAX_STATES; i++) {
		dev->state[i].card = dev;
		mutex_init(&dev->state[i].mutex);
		init_waitqueue_head(&dev->state[i].dmabuf.wait);
	}

	/* allocate dma buffer */

	for (i = 0; i < AD_MAX_STATES; i++) {
		dmabuf = &dev->state[i].dmabuf;
		dmabuf->rawbuf = kmalloc(DMA_SIZE, GFP_KERNEL|GFP_DMA);
		if (!dmabuf->rawbuf)
			goto err_free_dmabuf;
		dmabuf->rawbuf_size = DMA_SIZE;
		dmabuf->dma_handle = 0;
		dmabuf->rd_ptr = dmabuf->wr_ptr = dmabuf->dma_len = 0UL;
		dmabuf->ready = 0;
		dmabuf->rate = 48000;
	}
	return dev;

err_free_dmabuf:
	while (--i >= 0)
		kfree(dev->state[i].dmabuf.rawbuf);
	kfree(dev);
	return NULL;
}

static void ad1889_free_dev(ad1889_dev_t *dev)
{
	int j;
	struct dmabuf *dmabuf;

	if (dev == NULL) 
		return;

	if (dev->ac97_codec)
		ac97_release_codec(dev->ac97_codec);

	for (j = 0; j < AD_MAX_STATES; j++) {
		dmabuf = &dev->state[j].dmabuf;
		kfree(dmabuf->rawbuf);
	}

	kfree(dev);
}

static inline void ad1889_trigger_playback(ad1889_dev_t *dev)
{
#if 0
	u32 val;
	struct dmabuf *dmabuf = &dev->state[AD_WAV_STATE].dmabuf;
#endif

	ad1889_start_wav(&dev->state[AD_WAV_STATE]);
}

static int ad1889_read_proc (char *page, char **start, off_t off,
			     int count, int *eof, void *data)
{
	char *out = page;
	int len, i;
	ad1889_dev_t *dev = data;
	ad1889_reg_t regs[] = {
		{ "WSMC", AD_DS_WSMC, 16 },
		{ "RAMC", AD_DS_RAMC, 16 },
		{ "WADA", AD_DS_WADA, 16 },
		{ "SYDA", AD_DS_SYDA, 16 },
		{ "WAS", AD_DS_WAS, 16 },
		{ "RES", AD_DS_RES, 16 },
		{ "CCS", AD_DS_CCS, 16 },
		{ "ADCBA", AD_DMA_ADCBA, 32 },
		{ "ADCCA", AD_DMA_ADCCA, 32 },
		{ "ADCBC", AD_DMA_ADCBC, 32 },
		{ "ADCCC", AD_DMA_ADCCC, 32 },
		{ "ADCIBC", AD_DMA_ADCIBC, 32 },
		{ "ADCICC", AD_DMA_ADCICC, 32 },
		{ "ADCCTRL", AD_DMA_ADCCTRL, 16 },
		{ "WAVBA", AD_DMA_WAVBA, 32 },
		{ "WAVCA", AD_DMA_WAVCA, 32 },
		{ "WAVBC", AD_DMA_WAVBC, 32 },
		{ "WAVCC", AD_DMA_WAVCC, 32 },
		{ "WAVIBC", AD_DMA_WAVIBC, 32 },
		{ "WAVICC", AD_DMA_WAVICC, 32 },
		{ "WAVCTRL", AD_DMA_WAVCTRL, 16 },
		{ "DISR", AD_DMA_DISR, 32 },
		{ "CHSS", AD_DMA_CHSS, 32 },
		{ "IPC", AD_GPIO_IPC, 16 },
		{ "OP", AD_GPIO_OP, 16 },
		{ "IP", AD_GPIO_IP, 16 },
		{ "ACIC", AD_AC97_ACIC, 16 },
		{ "AC97_RESET", AD_AC97_BASE + AC97_RESET, 16 },
		{ "AC97_MASTER_VOL_STEREO", AD_AC97_BASE + AC97_MASTER_VOL_STEREO, 16 },
		{ "AC97_HEADPHONE_VOL", AD_AC97_BASE + AC97_HEADPHONE_VOL, 16 },
		{ "AC97_MASTER_VOL_MONO", AD_AC97_BASE + AC97_MASTER_VOL_MONO, 16 },
		{ "AC97_MASTER_TONE", AD_AC97_BASE + AC97_MASTER_TONE, 16 },
		{ "AC97_PCBEEP_VOL", AD_AC97_BASE + AC97_PCBEEP_VOL, 16 },
		{ "AC97_PHONE_VOL", AD_AC97_BASE + AC97_PHONE_VOL, 16 },
		{ "AC97_MIC_VOL", AD_AC97_BASE + AC97_MIC_VOL, 16 },
		{ "AC97_LINEIN_VOL", AD_AC97_BASE + AC97_LINEIN_VOL, 16 },
		{ "AC97_CD_VOL", AD_AC97_BASE + AC97_CD_VOL, 16 },
		{ "AC97_VIDEO_VOL", AD_AC97_BASE + AC97_VIDEO_VOL, 16 },
		{ "AC97_AUX_VOL", AD_AC97_BASE + AC97_AUX_VOL, 16 },
		{ "AC97_PCMOUT_VOL", AD_AC97_BASE + AC97_PCMOUT_VOL, 16 },
		{ "AC97_RECORD_SELECT", AD_AC97_BASE + AC97_RECORD_SELECT, 16 },
		{ "AC97_RECORD_GAIN", AD_AC97_BASE + AC97_RECORD_GAIN, 16 },
		{ "AC97_RECORD_GAIN_MIC", AD_AC97_BASE + AC97_RECORD_GAIN_MIC, 16 },
		{ "AC97_GENERAL_PURPOSE", AD_AC97_BASE + AC97_GENERAL_PURPOSE, 16 },
		{ "AC97_3D_CONTROL", AD_AC97_BASE + AC97_3D_CONTROL, 16 },
		{ "AC97_MODEM_RATE", AD_AC97_BASE + AC97_MODEM_RATE, 16 },
		{ "AC97_POWER_CONTROL", AD_AC97_BASE + AC97_POWER_CONTROL, 16 },
		{ NULL }
	};

	if (dev == NULL)
		return -ENODEV;

	for (i = 0; regs[i].name != 0; i++)
		out += sprintf(out, "%s: 0x%0*x\n", regs[i].name, 
			regs[i].width >> 2, 
			(regs[i].width == 16 
			 	? AD1889_READW(dev, regs[i].offset)
				: AD1889_READL(dev, regs[i].offset)));

	for (i = 0; i < AD_MAX_STATES; i++) {
		out += sprintf(out, "DMA status for %s:\n", 
			(i == AD_WAV_STATE ? "WAV" : "ADC")); 
		out += sprintf(out, "\t\t0x%p (IOVA: 0x%llu)\n",
			dev->state[i].dmabuf.rawbuf,
			(unsigned long long)dev->state[i].dmabuf.dma_handle);

		out += sprintf(out, "\tread ptr: offset %u\n", 
			(unsigned int)dev->state[i].dmabuf.rd_ptr);
		out += sprintf(out, "\twrite ptr: offset %u\n", 
			(unsigned int)dev->state[i].dmabuf.wr_ptr);
		out += sprintf(out, "\tdma len: offset %u\n", 
			(unsigned int)dev->state[i].dmabuf.dma_len);
	}

	len = out - page - off;
	if (len < count) {
		*eof = 1;
		if (len <= 0) return 0;
	} else {
		len = count;
	}
	*start = page + off;
	return len;
}

/***************************** DMA interfaces ************************** */
#if 0
static inline unsigned long ad1889_get_dma_addr(ad1889_state_t *state)
{
	struct dmabuf *dmabuf = &state->dmabuf;
	u32 offset;

	if (!(dmabuf->enable & (DAC_RUNNING | ADC_RUNNING))) {
		printk(KERN_ERR DEVNAME ": get_dma_addr called without dma enabled\n");
		return 0;
	}
	
	if (dmabuf->enable & DAC_RUNNING)
		offset = le32_to_cpu(AD1889_READL(state->card, AD_DMA_WAVBA));
	else
		offset = le32_to_cpu(AD1889_READL(state->card, AD_DMA_ADCBA));

	return (unsigned long)bus_to_virt((unsigned long)offset) - (unsigned long)dmabuf->rawbuf;
}

static void ad1889_update_ptr(ad1889_dev_t *dev, int wake)
{
	ad1889_state_t *state;
	struct dmabuf *dmabuf;
	unsigned long hwptr;
	int diff;

	/* check ADC first */
	state = &dev->adc_state;
	dmabuf = &state->dmabuf;
	if (dmabuf->enable & ADC_RUNNING) {
		hwptr = ad1889_get_dma_addr(state);
		diff = (dmabuf->dmasize + hwptr - dmabuf->hwptr) % dmabuf->dmasize;

		dmabuf->hwptr = hwptr;
		dmabuf->total_bytes += diff;
		dmabuf->count += diff;
		if (dmabuf->count > dmabuf->dmasize)
			dmabuf->count = dmabuf->dmasize;

		if (dmabuf->mapped) {
			if (wake & dmabuf->count >= dmabuf->fragsize)
				wake_up(&dmabuf->wait);
		} else {
			if (wake & dmabuf->count > 0)
				wake_up(&dmabuf->wait);
		}
	}

	/* check DAC */
	state = &dev->wav_state;
	dmabuf = &state->dmabuf;
	if (dmabuf->enable & DAC_RUNNING) {
XXX

}
#endif

/************************* /dev/dsp interfaces ************************* */

static ssize_t ad1889_read(struct file *file, char __user *buffer, size_t count,
	loff_t *ppos)
{
	return 0;
}

static ssize_t ad1889_write(struct file *file, const char __user *buffer, size_t count,
	loff_t *ppos)
{
	ad1889_dev_t *dev = (ad1889_dev_t *)file->private_data;
	ad1889_state_t *state = &dev->state[AD_WAV_STATE];
	volatile struct dmabuf *dmabuf = &state->dmabuf;
	ssize_t ret = 0;
	DECLARE_WAITQUEUE(wait, current);

	mutex_lock(&state->mutex);
#if 0
	if (dmabuf->mapped) {
		ret = -ENXIO;
		goto err1;
	}
#endif
	if (!access_ok(VERIFY_READ, buffer, count)) {
		ret = -EFAULT;
		goto err1;
	}

	add_wait_queue(&state->dmabuf.wait, &wait);

	/* start filling dma buffer.... */
	while (count > 0) {
		long rem;
		long cnt = count;
		unsigned long flags;

		for (;;) {
			long used_bytes;
			long timeout;	/* max time for DMA in jiffies */

			/* buffer is full if wr catches up to rd */
			spin_lock_irqsave(&state->card->lock, flags);
			used_bytes = dmabuf->wr_ptr - dmabuf->rd_ptr;
			timeout = (dmabuf->dma_len * HZ) / dmabuf->rate;
			spin_unlock_irqrestore(&state->card->lock, flags);

			/* adjust for buffer wrap around */
			used_bytes = (used_bytes + DMA_SIZE) & (DMA_SIZE - 1);

			/* If at least one page unused */
			if (used_bytes < (DMA_SIZE - 0x1000))
				break;

			/* dma buffer full */

			if (file->f_flags & O_NONBLOCK) {
				ret = -EAGAIN;
				goto err2;
			}

			set_current_state(TASK_INTERRUPTIBLE);
			schedule_timeout(timeout + 1);
			if (signal_pending(current)) {
				ret = -ERESTARTSYS;
				goto err2;
			}
		}

		/* watch out for wrapping around static buffer */
		spin_lock_irqsave(&state->card->lock, flags);
		rem = DMA_SIZE - dmabuf->wr_ptr;
		if (cnt > rem)
			cnt = rem;

		rem = dmabuf->wr_ptr;

		/* update dma pointers */
		dmabuf->wr_ptr += cnt;
		dmabuf->wr_ptr &= DMA_SIZE - 1;	/* wrap ptr if necessary */
		spin_unlock_irqrestore(&state->card->lock, flags);

		/* transfer unwrapped chunk */
		if (copy_from_user(dmabuf->rawbuf + rem, buffer, cnt)) {
			ret = -EFAULT;
			goto err2;
		}

		DBG("Writing 0x%lx bytes to +0x%lx\n", cnt, rem);

		/* update counters */
		count -= cnt;
		buffer += cnt;
		ret += cnt;

		/* we have something to play - go play it! */
		ad1889_trigger_playback(dev);
	}

err2:
	remove_wait_queue(&state->dmabuf.wait, &wait);
err1:
	mutex_unlock(&state->mutex);
	return ret;
}

static unsigned int ad1889_poll(struct file *file, struct poll_table_struct *wait)
{
	unsigned int mask = 0;
#if 0
	ad1889_dev_t *dev = (ad1889_dev_t *)file->private_data;
	ad1889_state_t *state = NULL;
	struct dmabuf *dmabuf;
	unsigned long flags;
	
	if (!(file->f_mode & (FMODE_READ | FMODE_WRITE)))
		return -EINVAL;

	if (file->f_mode & FMODE_WRITE) {
		state = &dev->state[AD_WAV_STATE];
		if (!state) return 0;
		dmabuf = &state->dmabuf;
		poll_wait(file, &dmabuf->wait, wait);
	}

	if (file->f_mode & FMODE_READ) {
		state = &dev->state[AD_ADC_STATE];
		if (!state) return 0;
		dmabuf = &state->dmabuf;
		poll_wait(file, &dmabuf->wait, wait);
	}

	spin_lock_irqsave(&dev->lock, flags);
	ad1889_update_ptr(dev, 0);

	if (file->f_mode & FMODE_WRITE) {
		state = &dev->state[WAV_STATE];
		dmabuf = &state->dmabuf;
		if (dmabuf->mapped) {
			if (dmabuf->count >= (int)dmabuf->fragsize)
				mask |= POLLOUT | POLLWRNORM;
		} else {
			if ((int)dmabuf->dmasize >= dmabuf->count + 
				(int)dmabuf->fragsize)
				mask |= POLLOUT | POLLWRNORM;
		}
	}

	if (file ->f_mode & FMODE_READ) {
		state = &dev->state[AD_ADC_STATE];
		dmabuf = &state->dmabuf;
		if (dmabuf->count >= (int)dmabuf->fragsize)
			mask |= POLLIN | POLLRDNORM;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

#endif
	return mask;
}

static int ad1889_mmap(struct file *file, struct vm_area_struct *vma)
{
	return 0;
}

static int ad1889_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	unsigned long arg)
{
	int val = 0;
	ad1889_dev_t *dev = (ad1889_dev_t *)file->private_data;
	struct dmabuf *dmabuf;
	audio_buf_info abinfo;
	int __user *p = (int __user *)arg;

	DBG("ad1889_ioctl cmd 0x%x arg %lu\n", cmd, arg);

	switch (cmd)
	{
	case OSS_GETVERSION:
		return put_user(SOUND_VERSION, p);

	case SNDCTL_DSP_RESET:
		break;

	case SNDCTL_DSP_SYNC:
		break;

	case SNDCTL_DSP_SPEED:
		/* set sampling rate */
		if (get_user(val, p))
			return -EFAULT;
		if (val > 5400 && val < 48000)
		{
			if (file->f_mode & FMODE_WRITE)
				AD1889_WRITEW(ad1889_dev, AD_DS_WAS, val);
			if (file->f_mode & FMODE_READ)
				AD1889_WRITEW(ad1889_dev, AD_DS_RES, val);
		}
		return 0;

	case SNDCTL_DSP_STEREO: /* undocumented? */
		if (get_user(val, p))
			return -EFAULT;
		if (file->f_mode & FMODE_READ) {
			val = AD1889_READW(ad1889_dev, AD_DS_WSMC);
			if (val) {
				val |= 0x0200;  /* set WAST */
			} else {
				val &= ~0x0200; /* clear WAST */
			}
			AD1889_WRITEW(ad1889_dev, AD_DS_WSMC, val);
		}
		if (file->f_mode & FMODE_WRITE) {
			val = AD1889_READW(ad1889_dev, AD_DS_RAMC);
			if (val) {
				val |= 0x0002;  /* set ADST */
			} else {
				val &= ~0x0002; /* clear ADST */
			}
			AD1889_WRITEW(ad1889_dev, AD_DS_RAMC, val);
		}

		return 0;

	case SNDCTL_DSP_GETBLKSIZE:
		return put_user(DMA_SIZE, p);

	case SNDCTL_DSP_GETFMTS:
		return put_user(AFMT_S16_LE|AFMT_U8, p);

	case SNDCTL_DSP_SETFMT:
		if (get_user(val, p))
			return -EFAULT;

		if (val == 0) {
			if (file->f_mode & FMODE_READ) 
				ad1889_set_adc_fmt(dev, val);

			if (file->f_mode & FMODE_WRITE) 
				ad1889_set_wav_fmt(dev, val);
		} else {
			val = AFMT_S16_LE | AFMT_U8;
		}

		return put_user(val, p);

	case SNDCTL_DSP_CHANNELS:
		break;

	case SNDCTL_DSP_POST:
		/* send all data to device */
		break;

	case SNDCTL_DSP_SUBDIVIDE:
		break;

	case SNDCTL_DSP_SETFRAGMENT:
		/* not supported; uses fixed fragment sizes */
		return put_user(DMA_SIZE, p);

	case SNDCTL_DSP_GETOSPACE:
	case SNDCTL_DSP_GETISPACE:
		/* space left in dma buffers */
		if (cmd == SNDCTL_DSP_GETOSPACE)
			dmabuf = &dev->state[AD_WAV_STATE].dmabuf;
		else
			dmabuf = &dev->state[AD_ADC_STATE].dmabuf;
		abinfo.fragments = 1;
		abinfo.fragstotal = 1;
		abinfo.fragsize = DMA_SIZE;
		abinfo.bytes = DMA_SIZE;
		return copy_to_user(p, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
	case SNDCTL_DSP_NONBLOCK:
		file->f_flags |= O_NONBLOCK;
		return 0;

	case SNDCTL_DSP_GETCAPS:
		return put_user(0, p);

	case SNDCTL_DSP_GETTRIGGER:
	case SNDCTL_DSP_SETTRIGGER:
		break;

	case SNDCTL_DSP_GETIPTR:
	case SNDCTL_DSP_GETOPTR:
		break;

	case SNDCTL_DSP_SETDUPLEX:
		break;
	
	case SNDCTL_DSP_GETODELAY:
		break;

	case SOUND_PCM_READ_RATE:
		return put_user(AD1889_READW(ad1889_dev, AD_DS_WAS), p);

	case SOUND_PCM_READ_CHANNELS:
	case SOUND_PCM_READ_BITS:
		break;

	case SNDCTL_DSP_MAPINBUF:
	case SNDCTL_DSP_MAPOUTBUF:
	case SNDCTL_DSP_SETSYNCRO:
	case SOUND_PCM_WRITE_FILTER:
	case SOUND_PCM_READ_FILTER:
		break;

	default:
		break;
	}

	return -ENOTTY;
}

static int ad1889_open(struct inode *inode, struct file *file)
{
	/* check minor; only support /dev/dsp atm */
	if (iminor(inode) != 3)
		return -ENXIO;
	
	file->private_data = ad1889_dev;

	ad1889_set_wav_rate(ad1889_dev, 48000);
	ad1889_set_wav_fmt(ad1889_dev, AFMT_S16_LE);
	AD1889_WRITEW(ad1889_dev, AD_DS_WADA, 0x0404); /* attenuation */
	return nonseekable_open(inode, file);
}

static int ad1889_release(struct inode *inode, struct file *file)
{
	/* if we have state free it here */
	return 0;
}

static const struct file_operations ad1889_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= ad1889_read,
	.write		= ad1889_write,
	.poll		= ad1889_poll,
	.ioctl		= ad1889_ioctl,
	.mmap		= ad1889_mmap,
	.open		= ad1889_open,
	.release	= ad1889_release,
};

/************************* /dev/mixer interfaces ************************ */
static int ad1889_mixer_open(struct inode *inode, struct file *file)
{
	if (ad1889_dev->ac97_codec->dev_mixer != iminor(inode))
		return -ENODEV;

	file->private_data = ad1889_dev->ac97_codec;
	return 0;
}

static int ad1889_mixer_release(struct inode *inode, struct file *file)
{
	return 0;
}

static int ad1889_mixer_ioctl(struct inode *inode, struct file *file,
	unsigned int cmd, unsigned long arg)
{
	struct ac97_codec *codec = (struct ac97_codec *)file->private_data;
	return codec->mixer_ioctl(codec, cmd, arg);
}

static const struct file_operations ad1889_mixer_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.ioctl		= ad1889_mixer_ioctl,
	.open		= ad1889_mixer_open,
	.release	= ad1889_mixer_release,
};

/************************* AC97 interfaces ****************************** */
static void ad1889_codec_write(struct ac97_codec *ac97, u8 reg, u16 val)
{
	ad1889_dev_t *dev = ac97->private_data;

	//DBG("Writing 0x%x to 0x%lx\n", val, dev->regbase + AD_AC97_BASE + reg);
	AD1889_WRITEW(dev, AD_AC97_BASE + reg, val);
}

static u16 ad1889_codec_read(struct ac97_codec *ac97, u8 reg)
{
	ad1889_dev_t *dev = ac97->private_data;
	//DBG("Reading from 0x%lx\n", dev->regbase + AD_AC97_BASE + reg);
	return AD1889_READW(dev, AD_AC97_BASE + reg);
}	

static int ad1889_ac97_init(ad1889_dev_t *dev, int id)
{
	struct ac97_codec *ac97;
	u16 eid;

	if ((ac97 = ac97_alloc_codec()) == NULL) 
		return -ENOMEM;

	ac97->private_data = dev;
	ac97->id = id;

	ac97->codec_read = ad1889_codec_read;
	ac97->codec_write = ad1889_codec_write;

	if (ac97_probe_codec(ac97) == 0) {
		printk(DEVNAME ": ac97_probe_codec failed\n");
		goto out_free;
	}

	eid = ad1889_codec_read(ac97, AC97_EXTENDED_ID);
	if (eid == 0xffff) {
		printk(KERN_WARNING DEVNAME ": no codec attached?\n");
		goto out_free;
	}

	dev->ac97_features = eid;

	if ((ac97->dev_mixer = register_sound_mixer(&ad1889_mixer_fops, -1)) < 0) {
		printk(KERN_ERR DEVNAME ": cannot register mixer\n");
		goto out_free;
	}

	dev->ac97_codec = ac97;
	return 0;

out_free:
	ac97_release_codec(ac97);
	return -ENODEV;
}

static int ad1889_aclink_reset(struct pci_dev * pcidev)
{
	u16 stat;
	int retry = 200;
	ad1889_dev_t *dev = pci_get_drvdata(pcidev);

	AD1889_WRITEW(dev, AD_DS_CCS, 0x8000); /* turn on clock */
	AD1889_READW(dev, AD_DS_CCS);

	WAIT_10MS();

	stat = AD1889_READW(dev, AD_AC97_ACIC);
	stat |= 0x0002;				/* Reset Disable */
	AD1889_WRITEW(dev, AD_AC97_ACIC, stat);
	(void) AD1889_READW(dev, AD_AC97_ACIC);	/* flush posted write */

	udelay(10);

	stat = AD1889_READW(dev, AD_AC97_ACIC);
	stat |= 0x0001;				/* Interface Enable */
	AD1889_WRITEW(dev, AD_AC97_ACIC, stat);

	do {
		if (AD1889_READW(dev, AD_AC97_ACIC) & 0x8000)	/* Ready */
			break;
		WAIT_10MS();
		retry--;
	} while (retry > 0);

	if (!retry) {
		printk(KERN_ERR "ad1889_aclink_reset: codec is not ready [0x%x]\n",
			    AD1889_READW(dev, AD_AC97_ACIC));
		return -EBUSY;
	}

	/* TODO reset AC97 codec */
	/* TODO set wave/adc pci ctrl status */

	stat = AD1889_READW(dev, AD_AC97_ACIC);
	stat |= 0x0004;				/* Audio Stream Output Enable */
	AD1889_WRITEW(dev, AD_AC97_ACIC, stat);
	return 0;
}

/************************* PCI interfaces ****************************** */
/* PCI device table */
static struct pci_device_id ad1889_id_tbl[] = {
	{ PCI_VENDOR_ID_ANALOG_DEVICES, PCI_DEVICE_ID_AD1889JS, PCI_ANY_ID, 
	  PCI_ANY_ID, 0, 0, (unsigned long)DEVNAME },
	{ },
};
MODULE_DEVICE_TABLE(pci, ad1889_id_tbl);

static irqreturn_t ad1889_interrupt(int irq, void *dev_id)
{
	u32 stat;
	ad1889_dev_t *dev = (ad1889_dev_t *)dev_id;

	stat = AD1889_READL(dev, AD_DMA_DISR);

	/* clear ISR */
	AD1889_WRITEL(dev, AD_DMA_DISR, stat);

	if (stat & 0x8) {		/* WAVI */
		DBG("WAV interrupt\n");
		dev->stats.wav_intrs++;
		if (dev->state[AD_WAV_STATE].dmabuf.ready) {
			ad1889_stop_wav(&dev->state[AD_WAV_STATE]);	/* clean up */
			ad1889_start_wav(&dev->state[AD_WAV_STATE]);	/* start new */
		}
	}

	if ((stat & 0x2) && dev->state[AD_ADC_STATE].dmabuf.ready) { /* ADCI */
		DBG("ADC interrupt\n");
		dev->stats.adc_intrs++;
	}
	if(stat)
		return IRQ_HANDLED;
	return IRQ_NONE;
}

static void ad1889_initcfg(ad1889_dev_t *dev)
{
	u16 tmp16;
	u32 tmp32;

	/* make sure the interrupt bits are setup the way we want */
	tmp32 = AD1889_READL(dev, AD_DMA_WAVCTRL);
	tmp32 &= ~0xff; /* flat dma, no sg, mask out the intr bits */
	tmp32 |= 0x6;  /* intr on count, loop */
	AD1889_WRITEL(dev, AD_DMA_WAVCTRL, tmp32);

	/* unmute... */
	tmp16 = AD1889_READW(dev, AD_DS_WADA);
	tmp16 &= ~0x8080;
	AD1889_WRITEW(dev, AD_DS_WADA, tmp16);
}

static int __devinit ad1889_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
{
	int err;
	ad1889_dev_t *dev;
	unsigned long bar;
	struct proc_dir_entry *proc_root = NULL;

	if ((err = pci_enable_device(pcidev)) != 0) {
		printk(KERN_ERR DEVNAME ": pci_enable_device failed\n");
		return err;
	}

	pci_set_master(pcidev);
	if ((dev = ad1889_alloc_dev(pcidev)) == NULL) {
		printk(KERN_ERR DEVNAME ": cannot allocate memory for device\n");
		return -ENOMEM;
	}
	pci_set_drvdata(pcidev, dev);
	bar = pci_resource_start(pcidev, 0);
	
        if (!(pci_resource_flags(pcidev, 0) & IORESOURCE_MEM)) {
		printk(KERN_ERR DEVNAME ": memory region not assigned\n");
		goto out1;
	}

	if (pci_request_region(pcidev, 0, DEVNAME)) {
		printk(KERN_ERR DEVNAME ": unable to request memory region\n");
		goto out1;
	}

	dev->regbase = ioremap_nocache(bar, AD_DS_IOMEMSIZE);
	if (!dev->regbase) {
		printk(KERN_ERR DEVNAME ": unable to remap iomem\n");
		goto out2;
	}

	if (request_irq(pcidev->irq, ad1889_interrupt, IRQF_SHARED, DEVNAME, dev) != 0) {
		printk(KERN_ERR DEVNAME ": unable to request interrupt\n");
		goto out3;
	}

	printk(KERN_INFO DEVNAME ": %s at %p IRQ %d\n",
		(char *)ent->driver_data, dev->regbase, pcidev->irq);

	if (ad1889_aclink_reset(pcidev) != 0)
		goto out4;

	/* register /dev/dsp */
	if ((dev->dev_audio = register_sound_dsp(&ad1889_fops, -1)) < 0) {
		printk(KERN_ERR DEVNAME ": cannot register /dev/dsp\n");
		goto out4;
	}

	if ((err = ad1889_ac97_init(dev, 0)) != 0)
		goto out5;

	/* XXX: cleanups */
	if (((proc_root = proc_mkdir("driver/ad1889", NULL)) == NULL) ||
	    create_proc_read_entry("ac97", S_IFREG|S_IRUGO, proc_root, ac97_read_proc, dev->ac97_codec) == NULL ||
	    create_proc_read_entry("info", S_IFREG|S_IRUGO, proc_root, ad1889_read_proc, dev) == NULL) 
		goto out5;
	
	ad1889_initcfg(dev);

	//DBG(DEVNAME ": Driver initialization done!\n");

	ad1889_dev = dev;

	return 0;

out5:
	unregister_sound_dsp(dev->dev_audio);
out4:
	free_irq(pcidev->irq, dev);
out3:
	iounmap(dev->regbase);
out2:
	pci_release_region(pcidev, 0);
out1:
	ad1889_free_dev(dev);
	pci_set_drvdata(pcidev, NULL);

	return -ENODEV;
}

static void __devexit ad1889_remove(struct pci_dev *pcidev)
{
	ad1889_dev_t *dev = pci_get_drvdata(pcidev);

	if (dev == NULL) return;
	
	unregister_sound_mixer(dev->ac97_codec->dev_mixer);
	unregister_sound_dsp(dev->dev_audio);
	free_irq(pcidev->irq, dev);
	iounmap(dev->regbase);
	pci_release_region(pcidev, 0);

	/* any hw programming needed? */
	ad1889_free_dev(dev);
	pci_set_drvdata(pcidev, NULL);
}

MODULE_AUTHOR("Randolph Chung");
MODULE_DESCRIPTION("Analog Devices AD1889 PCI Audio");
MODULE_LICENSE("GPL");

static struct pci_driver ad1889_driver = {
	.name		= DEVNAME,
	.id_table	= ad1889_id_tbl,
	.probe		= ad1889_probe,
	.remove		= __devexit_p(ad1889_remove),
};

static int __init ad1889_init_module(void)
{
	return pci_register_driver(&ad1889_driver);
}

static void ad1889_exit_module(void)
{
	pci_unregister_driver(&ad1889_driver);
	return;
}

module_init(ad1889_init_module);
module_exit(ad1889_exit_module);