aboutsummaryrefslogtreecommitdiff
path: root/hw/wm8750.c
blob: e5324ec417ecf7621dd385d0630605408d8d1337 (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
/*
 * WM8750 audio CODEC.
 *
 * Copyright (c) 2006 Openedhand Ltd.
 * Written by Andrzej Zaborowski <balrog@zabor.org>
 *
 * This file is licensed under GNU GPL.
 */

#include "hw.h"
#include "i2c.h"
#include "audio/audio.h"

#define IN_PORT_N	3
#define OUT_PORT_N	3

#define CODEC		"wm8750"

struct wm_rate_s;
struct wm8750_s {
    i2c_slave i2c;
    uint8_t i2c_data[2];
    int i2c_len;
    QEMUSoundCard card;
    SWVoiceIn *adc_voice[IN_PORT_N];
    SWVoiceOut *dac_voice[OUT_PORT_N];
    int enable;
    void (*data_req)(void *, int, int);
    void *opaque;
    uint8_t data_in[4096];
    uint8_t data_out[4096];
    int idx_in, req_in;
    int idx_out, req_out;

    SWVoiceOut **out[2];
    uint8_t outvol[7], outmute[2];
    SWVoiceIn **in[2];
    uint8_t invol[4], inmute[2];

    uint8_t diff[2], pol, ds, monomix[2], alc, mute;
    uint8_t path[4], mpath[2], power, format;
    const struct wm_rate_s *rate;
    int adc_hz, dac_hz, ext_adc_hz, ext_dac_hz, master;
};

/* pow(10.0, -i / 20.0) * 255, i = 0..42 */
static const uint8_t wm8750_vol_db_table[] = {
    255, 227, 203, 181, 161, 143, 128, 114, 102, 90, 81, 72, 64, 57, 51, 45,
    40, 36, 32, 29, 26, 23, 20, 18, 16, 14, 13, 11, 10, 9, 8, 7, 6, 6, 5, 5,
    4, 4, 3, 3, 3, 2, 2
};

#define WM8750_OUTVOL_TRANSFORM(x)	wm8750_vol_db_table[(0x7f - x) / 3]
#define WM8750_INVOL_TRANSFORM(x)	(x << 2)

static inline void wm8750_in_load(struct wm8750_s *s)
{
    int acquired;
    if (s->idx_in + s->req_in <= sizeof(s->data_in))
        return;
    s->idx_in = audio_MAX(0, (int) sizeof(s->data_in) - s->req_in);
    acquired = AUD_read(*s->in[0], s->data_in + s->idx_in,
                    sizeof(s->data_in) - s->idx_in);
}

static inline void wm8750_out_flush(struct wm8750_s *s)
{
    int sent = 0;
    while (sent < s->idx_out)
        sent += AUD_write(*s->out[0], s->data_out + sent, s->idx_out - sent)
                ?: s->idx_out;
    s->idx_out = 0;
}

static void wm8750_audio_in_cb(void *opaque, int avail_b)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;
    s->req_in = avail_b;
    s->data_req(s->opaque, s->req_out >> 2, avail_b >> 2);
}

static void wm8750_audio_out_cb(void *opaque, int free_b)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;

    if (s->idx_out >= free_b) {
        s->idx_out = free_b;
        s->req_out = 0;
        wm8750_out_flush(s);
    } else
        s->req_out = free_b - s->idx_out;
 
    s->data_req(s->opaque, s->req_out >> 2, s->req_in >> 2);
}

struct wm_rate_s {
    int adc;
    int adc_hz;
    int dac;
    int dac_hz;
};

static const struct wm_rate_s wm_rate_table[] = {
    {  256, 48000,  256, 48000 },	/* SR: 00000 */
    {  384, 48000,  384, 48000 },	/* SR: 00001 */
    {  256, 48000, 1536,  8000 },	/* SR: 00010 */
    {  384, 48000, 2304,  8000 },	/* SR: 00011 */
    { 1536,  8000,  256, 48000 },	/* SR: 00100 */
    { 2304,  8000,  384, 48000 },	/* SR: 00101 */
    { 1536,  8000, 1536,  8000 },	/* SR: 00110 */
    { 2304,  8000, 2304,  8000 },	/* SR: 00111 */
    { 1024, 12000, 1024, 12000 },	/* SR: 01000 */
    { 1526, 12000, 1536, 12000 },	/* SR: 01001 */
    {  768, 16000,  768, 16000 },	/* SR: 01010 */
    { 1152, 16000, 1152, 16000 },	/* SR: 01011 */
    {  384, 32000,  384, 32000 },	/* SR: 01100 */
    {  576, 32000,  576, 32000 },	/* SR: 01101 */
    {  128, 96000,  128, 96000 },	/* SR: 01110 */
    {  192, 96000,  192, 96000 },	/* SR: 01111 */
    {  256, 44100,  256, 44100 },	/* SR: 10000 */
    {  384, 44100,  384, 44100 },	/* SR: 10001 */
    {  256, 44100, 1408,  8018 },	/* SR: 10010 */
    {  384, 44100, 2112,  8018 },	/* SR: 10011 */
    { 1408,  8018,  256, 44100 },	/* SR: 10100 */
    { 2112,  8018,  384, 44100 },	/* SR: 10101 */
    { 1408,  8018, 1408,  8018 },	/* SR: 10110 */
    { 2112,  8018, 2112,  8018 },	/* SR: 10111 */
    { 1024, 11025, 1024, 11025 },	/* SR: 11000 */
    { 1536, 11025, 1536, 11025 },	/* SR: 11001 */
    {  512, 22050,  512, 22050 },	/* SR: 11010 */
    {  768, 22050,  768, 22050 },	/* SR: 11011 */
    {  512, 24000,  512, 24000 },	/* SR: 11100 */
    {  768, 24000,  768, 24000 },	/* SR: 11101 */
    {  128, 88200,  128, 88200 },	/* SR: 11110 */
    {  192, 88200,  192, 88200 },	/* SR: 11111 */
};

static void wm8750_vol_update(struct wm8750_s *s)
{
    /* FIXME: multiply all volumes by s->invol[2], s->invol[3] */

    AUD_set_volume_in(s->adc_voice[0], s->mute,
                    s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
                    s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));
    AUD_set_volume_in(s->adc_voice[1], s->mute,
                    s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
                    s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));
    AUD_set_volume_in(s->adc_voice[2], s->mute,
                    s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
                    s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));

    /* FIXME: multiply all volumes by s->outvol[0], s->outvol[1] */

    /* Speaker: LOUT2VOL ROUT2VOL */
    AUD_set_volume_out(s->dac_voice[0], s->mute,
                    s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[4]),
                    s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[5]));

    /* Headphone: LOUT1VOL ROUT1VOL */
    AUD_set_volume_out(s->dac_voice[1], s->mute,
                    s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[2]),
                    s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[3]));

    /* MONOOUT: MONOVOL MONOVOL */
    AUD_set_volume_out(s->dac_voice[2], s->mute,
                    s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[6]),
                    s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[6]));
}

static void wm8750_set_format(struct wm8750_s *s)
{
    int i;
    struct audsettings in_fmt;
    struct audsettings out_fmt;
    struct audsettings monoout_fmt;

    wm8750_out_flush(s);

    if (s->in[0] && *s->in[0])
        AUD_set_active_in(*s->in[0], 0);
    if (s->out[0] && *s->out[0])
        AUD_set_active_out(*s->out[0], 0);

    for (i = 0; i < IN_PORT_N; i ++)
        if (s->adc_voice[i]) {
            AUD_close_in(&s->card, s->adc_voice[i]);
            s->adc_voice[i] = NULL;
        }
    for (i = 0; i < OUT_PORT_N; i ++)
        if (s->dac_voice[i]) {
            AUD_close_out(&s->card, s->dac_voice[i]);
            s->dac_voice[i] = NULL;
        }

    if (!s->enable)
        return;

    /* Setup input */
    in_fmt.endianness = 0;
    in_fmt.nchannels = 2;
    in_fmt.freq = s->adc_hz;
    in_fmt.fmt = AUD_FMT_S16;

    s->adc_voice[0] = AUD_open_in(&s->card, s->adc_voice[0],
                    CODEC ".input1", s, wm8750_audio_in_cb, &in_fmt);
    s->adc_voice[1] = AUD_open_in(&s->card, s->adc_voice[1],
                    CODEC ".input2", s, wm8750_audio_in_cb, &in_fmt);
    s->adc_voice[2] = AUD_open_in(&s->card, s->adc_voice[2],
                    CODEC ".input3", s, wm8750_audio_in_cb, &in_fmt);

    /* Setup output */
    out_fmt.endianness = 0;
    out_fmt.nchannels = 2;
    out_fmt.freq = s->dac_hz;
    out_fmt.fmt = AUD_FMT_S16;
    monoout_fmt.endianness = 0;
    monoout_fmt.nchannels = 1;
    monoout_fmt.freq = s->rate->dac_hz;
    monoout_fmt.fmt = AUD_FMT_S16;

    s->dac_voice[0] = AUD_open_out(&s->card, s->dac_voice[0],
                    CODEC ".speaker", s, wm8750_audio_out_cb, &out_fmt);
    s->dac_voice[1] = AUD_open_out(&s->card, s->dac_voice[1],
                    CODEC ".headphone", s, wm8750_audio_out_cb, &out_fmt);
    /* MONOMIX is also in stereo for simplicity */
    s->dac_voice[2] = AUD_open_out(&s->card, s->dac_voice[2],
                    CODEC ".monomix", s, wm8750_audio_out_cb, &out_fmt);
    /* no sense emulating OUT3 which is a mix of other outputs */

    wm8750_vol_update(s);

    /* We should connect the left and right channels to their
     * respective inputs/outputs but we have completely no need
     * for mixing or combining paths to different ports, so we
     * connect both channels to where the left channel is routed.  */
    if (s->in[0] && *s->in[0])
        AUD_set_active_in(*s->in[0], 1);
    if (s->out[0] && *s->out[0])
        AUD_set_active_out(*s->out[0], 1);
}

static void wm8750_clk_update(struct wm8750_s *s, int ext)
{
    if (s->master || !s->ext_dac_hz)
        s->dac_hz = s->rate->dac_hz;
    else
        s->dac_hz = s->ext_dac_hz;

    if (s->master || !s->ext_adc_hz)
        s->adc_hz = s->rate->adc_hz;
    else
        s->adc_hz = s->ext_adc_hz;

    if (s->master || (!s->ext_dac_hz && !s->ext_adc_hz)) {
        if (!ext)
            wm8750_set_format(s);
    } else {
        if (ext)
            wm8750_set_format(s);
    }
}

void wm8750_reset(i2c_slave *i2c)
{
    struct wm8750_s *s = (struct wm8750_s *) i2c;
    s->rate = &wm_rate_table[0];
    s->enable = 0;
    wm8750_clk_update(s, 1);
    s->diff[0] = 0;
    s->diff[1] = 0;
    s->ds = 0;
    s->alc = 0;
    s->in[0] = &s->adc_voice[0];
    s->invol[0] = 0x17;
    s->invol[1] = 0x17;
    s->invol[2] = 0xc3;
    s->invol[3] = 0xc3;
    s->out[0] = &s->dac_voice[0];
    s->outvol[0] = 0xff;
    s->outvol[1] = 0xff;
    s->outvol[2] = 0x79;
    s->outvol[3] = 0x79;
    s->outvol[4] = 0x79;
    s->outvol[5] = 0x79;
    s->outvol[6] = 0x79;
    s->inmute[0] = 0;
    s->inmute[1] = 0;
    s->outmute[0] = 0;
    s->outmute[1] = 0;
    s->mute = 1;
    s->path[0] = 0;
    s->path[1] = 0;
    s->path[2] = 0;
    s->path[3] = 0;
    s->mpath[0] = 0;
    s->mpath[1] = 0;
    s->format = 0x0a;
    s->idx_in = sizeof(s->data_in);
    s->req_in = 0;
    s->idx_out = 0;
    s->req_out = 0;
    wm8750_vol_update(s);
    s->i2c_len = 0;
}

static void wm8750_event(i2c_slave *i2c, enum i2c_event event)
{
    struct wm8750_s *s = (struct wm8750_s *) i2c;

    switch (event) {
    case I2C_START_SEND:
        s->i2c_len = 0;
        break;
    case I2C_FINISH:
#ifdef VERBOSE
        if (s->i2c_len < 2)
            printf("%s: message too short (%i bytes)\n",
                            __FUNCTION__, s->i2c_len);
#endif
        break;
    default:
        break;
    }
}

#define WM8750_LINVOL	0x00
#define WM8750_RINVOL	0x01
#define WM8750_LOUT1V	0x02
#define WM8750_ROUT1V	0x03
#define WM8750_ADCDAC	0x05
#define WM8750_IFACE	0x07
#define WM8750_SRATE	0x08
#define WM8750_LDAC	0x0a
#define WM8750_RDAC	0x0b
#define WM8750_BASS	0x0c
#define WM8750_TREBLE	0x0d
#define WM8750_RESET	0x0f
#define WM8750_3D	0x10
#define WM8750_ALC1	0x11
#define WM8750_ALC2	0x12
#define WM8750_ALC3	0x13
#define WM8750_NGATE	0x14
#define WM8750_LADC	0x15
#define WM8750_RADC	0x16
#define WM8750_ADCTL1	0x17
#define WM8750_ADCTL2	0x18
#define WM8750_PWR1	0x19
#define WM8750_PWR2	0x1a
#define WM8750_ADCTL3	0x1b
#define WM8750_ADCIN	0x1f
#define WM8750_LADCIN	0x20
#define WM8750_RADCIN	0x21
#define WM8750_LOUTM1	0x22
#define WM8750_LOUTM2	0x23
#define WM8750_ROUTM1	0x24
#define WM8750_ROUTM2	0x25
#define WM8750_MOUTM1	0x26
#define WM8750_MOUTM2	0x27
#define WM8750_LOUT2V	0x28
#define WM8750_ROUT2V	0x29
#define WM8750_MOUTV	0x2a

static int wm8750_tx(i2c_slave *i2c, uint8_t data)
{
    struct wm8750_s *s = (struct wm8750_s *) i2c;
    uint8_t cmd;
    uint16_t value;

    if (s->i2c_len >= 2) {
        printf("%s: long message (%i bytes)\n", __FUNCTION__, s->i2c_len);
#ifdef VERBOSE
        return 1;
#endif
    }
    s->i2c_data[s->i2c_len ++] = data;
    if (s->i2c_len != 2)
        return 0;

    cmd = s->i2c_data[0] >> 1;
    value = ((s->i2c_data[0] << 8) | s->i2c_data[1]) & 0x1ff;

    switch (cmd) {
    case WM8750_LADCIN:	/* ADC Signal Path Control (Left) */
        s->diff[0] = (((value >> 6) & 3) == 3);	/* LINSEL */
        if (s->diff[0])
            s->in[0] = &s->adc_voice[0 + s->ds * 1];
        else
            s->in[0] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
        break;

    case WM8750_RADCIN:	/* ADC Signal Path Control (Right) */
        s->diff[1] = (((value >> 6) & 3) == 3);	/* RINSEL */
        if (s->diff[1])
            s->in[1] = &s->adc_voice[0 + s->ds * 1];
        else
            s->in[1] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
        break;

    case WM8750_ADCIN:	/* ADC Input Mode */
        s->ds = (value >> 8) & 1;	/* DS */
        if (s->diff[0])
            s->in[0] = &s->adc_voice[0 + s->ds * 1];
        if (s->diff[1])
            s->in[1] = &s->adc_voice[0 + s->ds * 1];
        s->monomix[0] = (value >> 6) & 3;	/* MONOMIX */
        break;

    case WM8750_ADCTL1:	/* Additional Control (1) */
        s->monomix[1] = (value >> 1) & 1;	/* DMONOMIX */
        break;

    case WM8750_PWR1:	/* Power Management (1) */
        s->enable = ((value >> 6) & 7) == 3;	/* VMIDSEL, VREF */
        wm8750_set_format(s);
        break;

    case WM8750_LINVOL:	/* Left Channel PGA */
        s->invol[0] = value & 0x3f;		/* LINVOL */
        s->inmute[0] = (value >> 7) & 1;	/* LINMUTE */
        wm8750_vol_update(s);
        break;

    case WM8750_RINVOL:	/* Right Channel PGA */
        s->invol[1] = value & 0x3f;		/* RINVOL */
        s->inmute[1] = (value >> 7) & 1;	/* RINMUTE */
        wm8750_vol_update(s);
        break;

    case WM8750_ADCDAC:	/* ADC and DAC Control */
        s->pol = (value >> 5) & 3;		/* ADCPOL */
        s->mute = (value >> 3) & 1;		/* DACMU */
        wm8750_vol_update(s);
        break;

    case WM8750_ADCTL3:	/* Additional Control (3) */
        break;

    case WM8750_LADC:	/* Left ADC Digital Volume */
        s->invol[2] = value & 0xff;		/* LADCVOL */
        wm8750_vol_update(s);
        break;

    case WM8750_RADC:	/* Right ADC Digital Volume */
        s->invol[3] = value & 0xff;		/* RADCVOL */
        wm8750_vol_update(s);
        break;

    case WM8750_ALC1:	/* ALC Control (1) */
        s->alc = (value >> 7) & 3;		/* ALCSEL */
        break;

    case WM8750_NGATE:	/* Noise Gate Control */
    case WM8750_3D:	/* 3D enhance */
        break;

    case WM8750_LDAC:	/* Left Channel Digital Volume */
        s->outvol[0] = value & 0xff;		/* LDACVOL */
        wm8750_vol_update(s);
        break;

    case WM8750_RDAC:	/* Right Channel Digital Volume */
        s->outvol[1] = value & 0xff;		/* RDACVOL */
        wm8750_vol_update(s);
        break;

    case WM8750_BASS:	/* Bass Control */
        break;

    case WM8750_LOUTM1:	/* Left Mixer Control (1) */
        s->path[0] = (value >> 8) & 1;		/* LD2LO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_LOUTM2:	/* Left Mixer Control (2) */
        s->path[1] = (value >> 8) & 1;		/* RD2LO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_ROUTM1:	/* Right Mixer Control (1) */
        s->path[2] = (value >> 8) & 1;		/* LD2RO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_ROUTM2:	/* Right Mixer Control (2) */
        s->path[3] = (value >> 8) & 1;		/* RD2RO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_MOUTM1:	/* Mono Mixer Control (1) */
        s->mpath[0] = (value >> 8) & 1;		/* LD2MO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_MOUTM2:	/* Mono Mixer Control (2) */
        s->mpath[1] = (value >> 8) & 1;		/* RD2MO */
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_LOUT1V:	/* LOUT1 Volume */
        s->outvol[2] = value & 0x7f;		/* LOUT1VOL */
        wm8750_vol_update(s);
        break;

    case WM8750_LOUT2V:	/* LOUT2 Volume */
        s->outvol[4] = value & 0x7f;		/* LOUT2VOL */
        wm8750_vol_update(s);
        break;

    case WM8750_ROUT1V:	/* ROUT1 Volume */
        s->outvol[3] = value & 0x7f;		/* ROUT1VOL */
        wm8750_vol_update(s);
        break;

    case WM8750_ROUT2V:	/* ROUT2 Volume */
        s->outvol[5] = value & 0x7f;		/* ROUT2VOL */
        wm8750_vol_update(s);
        break;

    case WM8750_MOUTV:	/* MONOOUT Volume */
        s->outvol[6] = value & 0x7f;		/* MONOOUTVOL */
        wm8750_vol_update(s);
        break;

    case WM8750_ADCTL2:	/* Additional Control (2) */
        break;

    case WM8750_PWR2:	/* Power Management (2) */
        s->power = value & 0x7e;
        /* TODO: mute/unmute respective paths */
        wm8750_vol_update(s);
        break;

    case WM8750_IFACE:	/* Digital Audio Interface Format */
        s->format = value;
        s->master = (value >> 6) & 1;			/* MS */
        wm8750_clk_update(s, s->master);
        break;

    case WM8750_SRATE:	/* Clocking and Sample Rate Control */
        s->rate = &wm_rate_table[(value >> 1) & 0x1f];
        wm8750_clk_update(s, 0);
        break;

    case WM8750_RESET:	/* Reset */
        wm8750_reset(&s->i2c);
        break;

#ifdef VERBOSE
    default:
        printf("%s: unknown register %02x\n", __FUNCTION__, cmd);
#endif
    }

    return 0;
}

static int wm8750_rx(i2c_slave *i2c)
{
    return 0x00;
}

static void wm8750_save(QEMUFile *f, void *opaque)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;
    int i;
    qemu_put_8s(f, &s->i2c_data[0]);
    qemu_put_8s(f, &s->i2c_data[1]);
    qemu_put_be32(f, s->i2c_len);
    qemu_put_be32(f, s->enable);
    qemu_put_be32(f, s->idx_in);
    qemu_put_be32(f, s->req_in);
    qemu_put_be32(f, s->idx_out);
    qemu_put_be32(f, s->req_out);

    for (i = 0; i < 7; i ++)
        qemu_put_8s(f, &s->outvol[i]);
    for (i = 0; i < 2; i ++)
        qemu_put_8s(f, &s->outmute[i]);
    for (i = 0; i < 4; i ++)
        qemu_put_8s(f, &s->invol[i]);
    for (i = 0; i < 2; i ++)
        qemu_put_8s(f, &s->inmute[i]);

    for (i = 0; i < 2; i ++)
        qemu_put_8s(f, &s->diff[i]);
    qemu_put_8s(f, &s->pol);
    qemu_put_8s(f, &s->ds);
    for (i = 0; i < 2; i ++)
        qemu_put_8s(f, &s->monomix[i]);
    qemu_put_8s(f, &s->alc);
    qemu_put_8s(f, &s->mute);
    for (i = 0; i < 4; i ++)
        qemu_put_8s(f, &s->path[i]);
    for (i = 0; i < 2; i ++)
        qemu_put_8s(f, &s->mpath[i]);
    qemu_put_8s(f, &s->format);
    qemu_put_8s(f, &s->power);
    qemu_put_byte(f, (s->rate - wm_rate_table) / sizeof(*s->rate));
    i2c_slave_save(f, &s->i2c);
}

static int wm8750_load(QEMUFile *f, void *opaque, int version_id)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;
    int i;
    qemu_get_8s(f, &s->i2c_data[0]);
    qemu_get_8s(f, &s->i2c_data[1]);
    s->i2c_len = qemu_get_be32(f);
    s->enable = qemu_get_be32(f);
    s->idx_in = qemu_get_be32(f);
    s->req_in = qemu_get_be32(f);
    s->idx_out = qemu_get_be32(f);
    s->req_out = qemu_get_be32(f);

    for (i = 0; i < 7; i ++)
        qemu_get_8s(f, &s->outvol[i]);
    for (i = 0; i < 2; i ++)
        qemu_get_8s(f, &s->outmute[i]);
    for (i = 0; i < 4; i ++)
        qemu_get_8s(f, &s->invol[i]);
    for (i = 0; i < 2; i ++)
        qemu_get_8s(f, &s->inmute[i]);

    for (i = 0; i < 2; i ++)
        qemu_get_8s(f, &s->diff[i]);
    qemu_get_8s(f, &s->pol);
    qemu_get_8s(f, &s->ds);
    for (i = 0; i < 2; i ++)
        qemu_get_8s(f, &s->monomix[i]);
    qemu_get_8s(f, &s->alc);
    qemu_get_8s(f, &s->mute);
    for (i = 0; i < 4; i ++)
        qemu_get_8s(f, &s->path[i]);
    for (i = 0; i < 2; i ++)
        qemu_get_8s(f, &s->mpath[i]);
    qemu_get_8s(f, &s->format);
    qemu_get_8s(f, &s->power);
    s->rate = &wm_rate_table[(uint8_t) qemu_get_byte(f) & 0x1f];
    i2c_slave_load(f, &s->i2c);
    return 0;
}

i2c_slave *wm8750_init(i2c_bus *bus, AudioState *audio)
{
    struct wm8750_s *s = (struct wm8750_s *)
            i2c_slave_init(bus, 0, sizeof(struct wm8750_s));
    s->i2c.event = wm8750_event;
    s->i2c.recv = wm8750_rx;
    s->i2c.send = wm8750_tx;

    AUD_register_card(audio, CODEC, &s->card);
    wm8750_reset(&s->i2c);

    register_savevm(CODEC, -1, 0, wm8750_save, wm8750_load, s);

    return &s->i2c;
}

#if 0
static void wm8750_fini(i2c_slave *i2c)
{
    struct wm8750_s *s = (struct wm8750_s *) i2c;
    wm8750_reset(&s->i2c);
    AUD_remove_card(&s->card);
    qemu_free(s);
}
#endif

void wm8750_data_req_set(i2c_slave *i2c,
                void (*data_req)(void *, int, int), void *opaque)
{
    struct wm8750_s *s = (struct wm8750_s *) i2c;
    s->data_req = data_req;
    s->opaque = opaque;
}

void wm8750_dac_dat(void *opaque, uint32_t sample)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;

    *(uint32_t *) &s->data_out[s->idx_out] = sample;
    s->req_out -= 4;
    s->idx_out += 4;
    if (s->idx_out >= sizeof(s->data_out) || s->req_out <= 0)
        wm8750_out_flush(s);
}

void *wm8750_dac_buffer(void *opaque, int samples)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;
    /* XXX: Should check if there are <i>samples</i> free samples available */
    void *ret = s->data_out + s->idx_out;

    s->idx_out += samples << 2;
    s->req_out -= samples << 2;
    return ret;
}

void wm8750_dac_commit(void *opaque)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;

    return wm8750_out_flush(s);
}

uint32_t wm8750_adc_dat(void *opaque)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;
    uint32_t *data;

    if (s->idx_in >= sizeof(s->data_in))
        wm8750_in_load(s);

    data = (uint32_t *) &s->data_in[s->idx_in];
    s->req_in -= 4;
    s->idx_in += 4;
    return *data;
}

void wm8750_set_bclk_in(void *opaque, int new_hz)
{
    struct wm8750_s *s = (struct wm8750_s *) opaque;

    s->ext_adc_hz = new_hz;
    s->ext_dac_hz = new_hz;
    wm8750_clk_update(s, 1);
}