xref: /openbmc/qemu/hw/audio/wm8750.c (revision c418f935)
1 /*
2  * WM8750 audio CODEC.
3  *
4  * Copyright (c) 2006 Openedhand Ltd.
5  * Written by Andrzej Zaborowski <balrog@zabor.org>
6  *
7  * This file is licensed under GNU GPL.
8  */
9 
10 #include "qemu/osdep.h"
11 #include "hw/i2c/i2c.h"
12 #include "migration/vmstate.h"
13 #include "qemu/module.h"
14 #include "hw/audio/wm8750.h"
15 #include "audio/audio.h"
16 #include "qom/object.h"
17 
18 #define IN_PORT_N	3
19 #define OUT_PORT_N	3
20 
21 #define CODEC		"wm8750"
22 
23 typedef struct {
24     int adc;
25     int adc_hz;
26     int dac;
27     int dac_hz;
28 } WMRate;
29 
30 typedef struct WM8750State WM8750State;
31 DECLARE_INSTANCE_CHECKER(WM8750State, WM8750,
32                          TYPE_WM8750)
33 
34 struct WM8750State {
35     I2CSlave parent_obj;
36 
37     uint8_t i2c_data[2];
38     int i2c_len;
39     QEMUSoundCard card;
40     SWVoiceIn *adc_voice[IN_PORT_N];
41     SWVoiceOut *dac_voice[OUT_PORT_N];
42     int enable;
43     void (*data_req)(void *, int, int);
44     void *opaque;
45     uint8_t data_in[4096];
46     uint8_t data_out[4096];
47     int idx_in, req_in;
48     int idx_out, req_out;
49 
50     SWVoiceOut **out[2];
51     uint8_t outvol[7], outmute[2];
52     SWVoiceIn **in[2];
53     uint8_t invol[4], inmute[2];
54 
55     uint8_t diff[2], pol, ds, monomix[2], alc, mute;
56     uint8_t path[4], mpath[2], power, format;
57     const WMRate *rate;
58     uint8_t rate_vmstate;
59     int adc_hz, dac_hz, ext_adc_hz, ext_dac_hz, master;
60 };
61 
62 /* pow(10.0, -i / 20.0) * 255, i = 0..42 */
63 static const uint8_t wm8750_vol_db_table[] = {
64     255, 227, 203, 181, 161, 143, 128, 114, 102, 90, 81, 72, 64, 57, 51, 45,
65     40, 36, 32, 29, 26, 23, 20, 18, 16, 14, 13, 11, 10, 9, 8, 7, 6, 6, 5, 5,
66     4, 4, 3, 3, 3, 2, 2
67 };
68 
69 #define WM8750_OUTVOL_TRANSFORM(x)	wm8750_vol_db_table[(0x7f - x) / 3]
70 #define WM8750_INVOL_TRANSFORM(x)	(x << 2)
71 
72 static inline void wm8750_in_load(WM8750State *s)
73 {
74     if (s->idx_in + s->req_in <= sizeof(s->data_in))
75         return;
76     s->idx_in = MAX(0, (int) sizeof(s->data_in) - s->req_in);
77     AUD_read(*s->in[0], s->data_in + s->idx_in,
78              sizeof(s->data_in) - s->idx_in);
79 }
80 
81 static inline void wm8750_out_flush(WM8750State *s)
82 {
83     int sent = 0;
84     while (sent < s->idx_out)
85         sent += AUD_write(*s->out[0], s->data_out + sent, s->idx_out - sent)
86                 ?: s->idx_out;
87     s->idx_out = 0;
88 }
89 
90 static void wm8750_audio_in_cb(void *opaque, int avail_b)
91 {
92     WM8750State *s = (WM8750State *) opaque;
93     s->req_in = avail_b;
94     s->data_req(s->opaque, s->req_out >> 2, avail_b >> 2);
95 }
96 
97 static void wm8750_audio_out_cb(void *opaque, int free_b)
98 {
99     WM8750State *s = (WM8750State *) opaque;
100 
101     if (s->idx_out >= free_b) {
102         s->idx_out = free_b;
103         s->req_out = 0;
104         wm8750_out_flush(s);
105     } else
106         s->req_out = free_b - s->idx_out;
107 
108     s->data_req(s->opaque, s->req_out >> 2, s->req_in >> 2);
109 }
110 
111 static const WMRate wm_rate_table[] = {
112     {  256, 48000,  256, 48000 },	/* SR: 00000 */
113     {  384, 48000,  384, 48000 },	/* SR: 00001 */
114     {  256, 48000, 1536,  8000 },	/* SR: 00010 */
115     {  384, 48000, 2304,  8000 },	/* SR: 00011 */
116     { 1536,  8000,  256, 48000 },	/* SR: 00100 */
117     { 2304,  8000,  384, 48000 },	/* SR: 00101 */
118     { 1536,  8000, 1536,  8000 },	/* SR: 00110 */
119     { 2304,  8000, 2304,  8000 },	/* SR: 00111 */
120     { 1024, 12000, 1024, 12000 },	/* SR: 01000 */
121     { 1526, 12000, 1536, 12000 },	/* SR: 01001 */
122     {  768, 16000,  768, 16000 },	/* SR: 01010 */
123     { 1152, 16000, 1152, 16000 },	/* SR: 01011 */
124     {  384, 32000,  384, 32000 },	/* SR: 01100 */
125     {  576, 32000,  576, 32000 },	/* SR: 01101 */
126     {  128, 96000,  128, 96000 },	/* SR: 01110 */
127     {  192, 96000,  192, 96000 },	/* SR: 01111 */
128     {  256, 44100,  256, 44100 },	/* SR: 10000 */
129     {  384, 44100,  384, 44100 },	/* SR: 10001 */
130     {  256, 44100, 1408,  8018 },	/* SR: 10010 */
131     {  384, 44100, 2112,  8018 },	/* SR: 10011 */
132     { 1408,  8018,  256, 44100 },	/* SR: 10100 */
133     { 2112,  8018,  384, 44100 },	/* SR: 10101 */
134     { 1408,  8018, 1408,  8018 },	/* SR: 10110 */
135     { 2112,  8018, 2112,  8018 },	/* SR: 10111 */
136     { 1024, 11025, 1024, 11025 },	/* SR: 11000 */
137     { 1536, 11025, 1536, 11025 },	/* SR: 11001 */
138     {  512, 22050,  512, 22050 },	/* SR: 11010 */
139     {  768, 22050,  768, 22050 },	/* SR: 11011 */
140     {  512, 24000,  512, 24000 },	/* SR: 11100 */
141     {  768, 24000,  768, 24000 },	/* SR: 11101 */
142     {  128, 88200,  128, 88200 },	/* SR: 11110 */
143     {  192, 88200,  192, 88200 },	/* SR: 11111 */
144 };
145 
146 static void wm8750_vol_update(WM8750State *s)
147 {
148     /* FIXME: multiply all volumes by s->invol[2], s->invol[3] */
149 
150     AUD_set_volume_in(s->adc_voice[0], s->mute,
151                     s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
152                     s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));
153     AUD_set_volume_in(s->adc_voice[1], s->mute,
154                     s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
155                     s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));
156     AUD_set_volume_in(s->adc_voice[2], s->mute,
157                     s->inmute[0] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[0]),
158                     s->inmute[1] ? 0 : WM8750_INVOL_TRANSFORM(s->invol[1]));
159 
160     /* FIXME: multiply all volumes by s->outvol[0], s->outvol[1] */
161 
162     /* Speaker: LOUT2VOL ROUT2VOL */
163     AUD_set_volume_out(s->dac_voice[0], s->mute,
164                     s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[4]),
165                     s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[5]));
166 
167     /* Headphone: LOUT1VOL ROUT1VOL */
168     AUD_set_volume_out(s->dac_voice[1], s->mute,
169                     s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[2]),
170                     s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[3]));
171 
172     /* MONOOUT: MONOVOL MONOVOL */
173     AUD_set_volume_out(s->dac_voice[2], s->mute,
174                     s->outmute[0] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[6]),
175                     s->outmute[1] ? 0 : WM8750_OUTVOL_TRANSFORM(s->outvol[6]));
176 }
177 
178 static void wm8750_set_format(WM8750State *s)
179 {
180     int i;
181     struct audsettings in_fmt;
182     struct audsettings out_fmt;
183 
184     wm8750_out_flush(s);
185 
186     if (s->in[0] && *s->in[0])
187         AUD_set_active_in(*s->in[0], 0);
188     if (s->out[0] && *s->out[0])
189         AUD_set_active_out(*s->out[0], 0);
190 
191     for (i = 0; i < IN_PORT_N; i ++)
192         if (s->adc_voice[i]) {
193             AUD_close_in(&s->card, s->adc_voice[i]);
194             s->adc_voice[i] = NULL;
195         }
196     for (i = 0; i < OUT_PORT_N; i ++)
197         if (s->dac_voice[i]) {
198             AUD_close_out(&s->card, s->dac_voice[i]);
199             s->dac_voice[i] = NULL;
200         }
201 
202     if (!s->enable)
203         return;
204 
205     /* Setup input */
206     in_fmt.endianness = 0;
207     in_fmt.nchannels = 2;
208     in_fmt.freq = s->adc_hz;
209     in_fmt.fmt = AUDIO_FORMAT_S16;
210 
211     s->adc_voice[0] = AUD_open_in(&s->card, s->adc_voice[0],
212                     CODEC ".input1", s, wm8750_audio_in_cb, &in_fmt);
213     s->adc_voice[1] = AUD_open_in(&s->card, s->adc_voice[1],
214                     CODEC ".input2", s, wm8750_audio_in_cb, &in_fmt);
215     s->adc_voice[2] = AUD_open_in(&s->card, s->adc_voice[2],
216                     CODEC ".input3", s, wm8750_audio_in_cb, &in_fmt);
217 
218     /* Setup output */
219     out_fmt.endianness = 0;
220     out_fmt.nchannels = 2;
221     out_fmt.freq = s->dac_hz;
222     out_fmt.fmt = AUDIO_FORMAT_S16;
223 
224     s->dac_voice[0] = AUD_open_out(&s->card, s->dac_voice[0],
225                     CODEC ".speaker", s, wm8750_audio_out_cb, &out_fmt);
226     s->dac_voice[1] = AUD_open_out(&s->card, s->dac_voice[1],
227                     CODEC ".headphone", s, wm8750_audio_out_cb, &out_fmt);
228     /* MONOMIX is also in stereo for simplicity */
229     s->dac_voice[2] = AUD_open_out(&s->card, s->dac_voice[2],
230                     CODEC ".monomix", s, wm8750_audio_out_cb, &out_fmt);
231     /* no sense emulating OUT3 which is a mix of other outputs */
232 
233     wm8750_vol_update(s);
234 
235     /* We should connect the left and right channels to their
236      * respective inputs/outputs but we have completely no need
237      * for mixing or combining paths to different ports, so we
238      * connect both channels to where the left channel is routed.  */
239     if (s->in[0] && *s->in[0])
240         AUD_set_active_in(*s->in[0], 1);
241     if (s->out[0] && *s->out[0])
242         AUD_set_active_out(*s->out[0], 1);
243 }
244 
245 static void wm8750_clk_update(WM8750State *s, int ext)
246 {
247     if (s->master || !s->ext_dac_hz)
248         s->dac_hz = s->rate->dac_hz;
249     else
250         s->dac_hz = s->ext_dac_hz;
251 
252     if (s->master || !s->ext_adc_hz)
253         s->adc_hz = s->rate->adc_hz;
254     else
255         s->adc_hz = s->ext_adc_hz;
256 
257     if (s->master || (!s->ext_dac_hz && !s->ext_adc_hz)) {
258         if (!ext)
259             wm8750_set_format(s);
260     } else {
261         if (ext)
262             wm8750_set_format(s);
263     }
264 }
265 
266 static void wm8750_reset(I2CSlave *i2c)
267 {
268     WM8750State *s = WM8750(i2c);
269 
270     s->rate = &wm_rate_table[0];
271     s->enable = 0;
272     wm8750_clk_update(s, 1);
273     s->diff[0] = 0;
274     s->diff[1] = 0;
275     s->ds = 0;
276     s->alc = 0;
277     s->in[0] = &s->adc_voice[0];
278     s->invol[0] = 0x17;
279     s->invol[1] = 0x17;
280     s->invol[2] = 0xc3;
281     s->invol[3] = 0xc3;
282     s->out[0] = &s->dac_voice[0];
283     s->outvol[0] = 0xff;
284     s->outvol[1] = 0xff;
285     s->outvol[2] = 0x79;
286     s->outvol[3] = 0x79;
287     s->outvol[4] = 0x79;
288     s->outvol[5] = 0x79;
289     s->outvol[6] = 0x79;
290     s->inmute[0] = 0;
291     s->inmute[1] = 0;
292     s->outmute[0] = 0;
293     s->outmute[1] = 0;
294     s->mute = 1;
295     s->path[0] = 0;
296     s->path[1] = 0;
297     s->path[2] = 0;
298     s->path[3] = 0;
299     s->mpath[0] = 0;
300     s->mpath[1] = 0;
301     s->format = 0x0a;
302     s->idx_in = sizeof(s->data_in);
303     s->req_in = 0;
304     s->idx_out = 0;
305     s->req_out = 0;
306     wm8750_vol_update(s);
307     s->i2c_len = 0;
308 }
309 
310 static int wm8750_event(I2CSlave *i2c, enum i2c_event event)
311 {
312     WM8750State *s = WM8750(i2c);
313 
314     switch (event) {
315     case I2C_START_SEND:
316         s->i2c_len = 0;
317         break;
318     case I2C_FINISH:
319 #ifdef VERBOSE
320         if (s->i2c_len < 2)
321             printf("%s: message too short (%i bytes)\n",
322                             __func__, s->i2c_len);
323 #endif
324         break;
325     default:
326         break;
327     }
328 
329     return 0;
330 }
331 
332 #define WM8750_LINVOL	0x00
333 #define WM8750_RINVOL	0x01
334 #define WM8750_LOUT1V	0x02
335 #define WM8750_ROUT1V	0x03
336 #define WM8750_ADCDAC	0x05
337 #define WM8750_IFACE	0x07
338 #define WM8750_SRATE	0x08
339 #define WM8750_LDAC	0x0a
340 #define WM8750_RDAC	0x0b
341 #define WM8750_BASS	0x0c
342 #define WM8750_TREBLE	0x0d
343 #define WM8750_RESET	0x0f
344 #define WM8750_3D	0x10
345 #define WM8750_ALC1	0x11
346 #define WM8750_ALC2	0x12
347 #define WM8750_ALC3	0x13
348 #define WM8750_NGATE	0x14
349 #define WM8750_LADC	0x15
350 #define WM8750_RADC	0x16
351 #define WM8750_ADCTL1	0x17
352 #define WM8750_ADCTL2	0x18
353 #define WM8750_PWR1	0x19
354 #define WM8750_PWR2	0x1a
355 #define WM8750_ADCTL3	0x1b
356 #define WM8750_ADCIN	0x1f
357 #define WM8750_LADCIN	0x20
358 #define WM8750_RADCIN	0x21
359 #define WM8750_LOUTM1	0x22
360 #define WM8750_LOUTM2	0x23
361 #define WM8750_ROUTM1	0x24
362 #define WM8750_ROUTM2	0x25
363 #define WM8750_MOUTM1	0x26
364 #define WM8750_MOUTM2	0x27
365 #define WM8750_LOUT2V	0x28
366 #define WM8750_ROUT2V	0x29
367 #define WM8750_MOUTV	0x2a
368 
369 static int wm8750_tx(I2CSlave *i2c, uint8_t data)
370 {
371     WM8750State *s = WM8750(i2c);
372     uint8_t cmd;
373     uint16_t value;
374 
375     if (s->i2c_len >= 2) {
376 #ifdef VERBOSE
377         printf("%s: long message (%i bytes)\n", __func__, s->i2c_len);
378 #endif
379         return 1;
380     }
381     s->i2c_data[s->i2c_len ++] = data;
382     if (s->i2c_len != 2)
383         return 0;
384 
385     cmd = s->i2c_data[0] >> 1;
386     value = ((s->i2c_data[0] << 8) | s->i2c_data[1]) & 0x1ff;
387 
388     switch (cmd) {
389     case WM8750_LADCIN:	/* ADC Signal Path Control (Left) */
390         s->diff[0] = (((value >> 6) & 3) == 3);	/* LINSEL */
391         if (s->diff[0])
392             s->in[0] = &s->adc_voice[0 + s->ds * 1];
393         else
394             s->in[0] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
395         break;
396 
397     case WM8750_RADCIN:	/* ADC Signal Path Control (Right) */
398         s->diff[1] = (((value >> 6) & 3) == 3);	/* RINSEL */
399         if (s->diff[1])
400             s->in[1] = &s->adc_voice[0 + s->ds * 1];
401         else
402             s->in[1] = &s->adc_voice[((value >> 6) & 3) * 1 + 0];
403         break;
404 
405     case WM8750_ADCIN:	/* ADC Input Mode */
406         s->ds = (value >> 8) & 1;	/* DS */
407         if (s->diff[0])
408             s->in[0] = &s->adc_voice[0 + s->ds * 1];
409         if (s->diff[1])
410             s->in[1] = &s->adc_voice[0 + s->ds * 1];
411         s->monomix[0] = (value >> 6) & 3;	/* MONOMIX */
412         break;
413 
414     case WM8750_ADCTL1:	/* Additional Control (1) */
415         s->monomix[1] = (value >> 1) & 1;	/* DMONOMIX */
416         break;
417 
418     case WM8750_PWR1:	/* Power Management (1) */
419         s->enable = ((value >> 6) & 7) == 3;	/* VMIDSEL, VREF */
420         wm8750_set_format(s);
421         break;
422 
423     case WM8750_LINVOL:	/* Left Channel PGA */
424         s->invol[0] = value & 0x3f;		/* LINVOL */
425         s->inmute[0] = (value >> 7) & 1;	/* LINMUTE */
426         wm8750_vol_update(s);
427         break;
428 
429     case WM8750_RINVOL:	/* Right Channel PGA */
430         s->invol[1] = value & 0x3f;		/* RINVOL */
431         s->inmute[1] = (value >> 7) & 1;	/* RINMUTE */
432         wm8750_vol_update(s);
433         break;
434 
435     case WM8750_ADCDAC:	/* ADC and DAC Control */
436         s->pol = (value >> 5) & 3;		/* ADCPOL */
437         s->mute = (value >> 3) & 1;		/* DACMU */
438         wm8750_vol_update(s);
439         break;
440 
441     case WM8750_ADCTL3:	/* Additional Control (3) */
442         break;
443 
444     case WM8750_LADC:	/* Left ADC Digital Volume */
445         s->invol[2] = value & 0xff;		/* LADCVOL */
446         wm8750_vol_update(s);
447         break;
448 
449     case WM8750_RADC:	/* Right ADC Digital Volume */
450         s->invol[3] = value & 0xff;		/* RADCVOL */
451         wm8750_vol_update(s);
452         break;
453 
454     case WM8750_ALC1:	/* ALC Control (1) */
455         s->alc = (value >> 7) & 3;		/* ALCSEL */
456         break;
457 
458     case WM8750_NGATE:	/* Noise Gate Control */
459     case WM8750_3D:	/* 3D enhance */
460         break;
461 
462     case WM8750_LDAC:	/* Left Channel Digital Volume */
463         s->outvol[0] = value & 0xff;		/* LDACVOL */
464         wm8750_vol_update(s);
465         break;
466 
467     case WM8750_RDAC:	/* Right Channel Digital Volume */
468         s->outvol[1] = value & 0xff;		/* RDACVOL */
469         wm8750_vol_update(s);
470         break;
471 
472     case WM8750_BASS:	/* Bass Control */
473         break;
474 
475     case WM8750_LOUTM1:	/* Left Mixer Control (1) */
476         s->path[0] = (value >> 8) & 1;		/* LD2LO */
477         /* TODO: mute/unmute respective paths */
478         wm8750_vol_update(s);
479         break;
480 
481     case WM8750_LOUTM2:	/* Left Mixer Control (2) */
482         s->path[1] = (value >> 8) & 1;		/* RD2LO */
483         /* TODO: mute/unmute respective paths */
484         wm8750_vol_update(s);
485         break;
486 
487     case WM8750_ROUTM1:	/* Right Mixer Control (1) */
488         s->path[2] = (value >> 8) & 1;		/* LD2RO */
489         /* TODO: mute/unmute respective paths */
490         wm8750_vol_update(s);
491         break;
492 
493     case WM8750_ROUTM2:	/* Right Mixer Control (2) */
494         s->path[3] = (value >> 8) & 1;		/* RD2RO */
495         /* TODO: mute/unmute respective paths */
496         wm8750_vol_update(s);
497         break;
498 
499     case WM8750_MOUTM1:	/* Mono Mixer Control (1) */
500         s->mpath[0] = (value >> 8) & 1;		/* LD2MO */
501         /* TODO: mute/unmute respective paths */
502         wm8750_vol_update(s);
503         break;
504 
505     case WM8750_MOUTM2:	/* Mono Mixer Control (2) */
506         s->mpath[1] = (value >> 8) & 1;		/* RD2MO */
507         /* TODO: mute/unmute respective paths */
508         wm8750_vol_update(s);
509         break;
510 
511     case WM8750_LOUT1V:	/* LOUT1 Volume */
512         s->outvol[2] = value & 0x7f;		/* LOUT1VOL */
513         wm8750_vol_update(s);
514         break;
515 
516     case WM8750_LOUT2V:	/* LOUT2 Volume */
517         s->outvol[4] = value & 0x7f;		/* LOUT2VOL */
518         wm8750_vol_update(s);
519         break;
520 
521     case WM8750_ROUT1V:	/* ROUT1 Volume */
522         s->outvol[3] = value & 0x7f;		/* ROUT1VOL */
523         wm8750_vol_update(s);
524         break;
525 
526     case WM8750_ROUT2V:	/* ROUT2 Volume */
527         s->outvol[5] = value & 0x7f;		/* ROUT2VOL */
528         wm8750_vol_update(s);
529         break;
530 
531     case WM8750_MOUTV:	/* MONOOUT Volume */
532         s->outvol[6] = value & 0x7f;		/* MONOOUTVOL */
533         wm8750_vol_update(s);
534         break;
535 
536     case WM8750_ADCTL2:	/* Additional Control (2) */
537         break;
538 
539     case WM8750_PWR2:	/* Power Management (2) */
540         s->power = value & 0x7e;
541         /* TODO: mute/unmute respective paths */
542         wm8750_vol_update(s);
543         break;
544 
545     case WM8750_IFACE:	/* Digital Audio Interface Format */
546         s->format = value;
547         s->master = (value >> 6) & 1;			/* MS */
548         wm8750_clk_update(s, s->master);
549         break;
550 
551     case WM8750_SRATE:	/* Clocking and Sample Rate Control */
552         s->rate = &wm_rate_table[(value >> 1) & 0x1f];
553         wm8750_clk_update(s, 0);
554         break;
555 
556     case WM8750_RESET:	/* Reset */
557         wm8750_reset(I2C_SLAVE(s));
558         break;
559 
560 #ifdef VERBOSE
561     default:
562         printf("%s: unknown register %02x\n", __func__, cmd);
563 #endif
564     }
565 
566     return 0;
567 }
568 
569 static uint8_t wm8750_rx(I2CSlave *i2c)
570 {
571     return 0x00;
572 }
573 
574 static int wm8750_pre_save(void *opaque)
575 {
576     WM8750State *s = opaque;
577 
578     s->rate_vmstate = s->rate - wm_rate_table;
579 
580     return 0;
581 }
582 
583 static int wm8750_post_load(void *opaque, int version_id)
584 {
585     WM8750State *s = opaque;
586 
587     s->rate = &wm_rate_table[s->rate_vmstate & 0x1f];
588     return 0;
589 }
590 
591 static const VMStateDescription vmstate_wm8750 = {
592     .name = CODEC,
593     .version_id = 0,
594     .minimum_version_id = 0,
595     .pre_save = wm8750_pre_save,
596     .post_load = wm8750_post_load,
597     .fields = (VMStateField[]) {
598         VMSTATE_UINT8_ARRAY(i2c_data, WM8750State, 2),
599         VMSTATE_INT32(i2c_len, WM8750State),
600         VMSTATE_INT32(enable, WM8750State),
601         VMSTATE_INT32(idx_in, WM8750State),
602         VMSTATE_INT32(req_in, WM8750State),
603         VMSTATE_INT32(idx_out, WM8750State),
604         VMSTATE_INT32(req_out, WM8750State),
605         VMSTATE_UINT8_ARRAY(outvol, WM8750State, 7),
606         VMSTATE_UINT8_ARRAY(outmute, WM8750State, 2),
607         VMSTATE_UINT8_ARRAY(invol, WM8750State, 4),
608         VMSTATE_UINT8_ARRAY(inmute, WM8750State, 2),
609         VMSTATE_UINT8_ARRAY(diff, WM8750State, 2),
610         VMSTATE_UINT8(pol, WM8750State),
611         VMSTATE_UINT8(ds, WM8750State),
612         VMSTATE_UINT8_ARRAY(monomix, WM8750State, 2),
613         VMSTATE_UINT8(alc, WM8750State),
614         VMSTATE_UINT8(mute, WM8750State),
615         VMSTATE_UINT8_ARRAY(path, WM8750State, 4),
616         VMSTATE_UINT8_ARRAY(mpath, WM8750State, 2),
617         VMSTATE_UINT8(format, WM8750State),
618         VMSTATE_UINT8(power, WM8750State),
619         VMSTATE_UINT8(rate_vmstate, WM8750State),
620         VMSTATE_I2C_SLAVE(parent_obj, WM8750State),
621         VMSTATE_END_OF_LIST()
622     }
623 };
624 
625 static void wm8750_realize(DeviceState *dev, Error **errp)
626 {
627     WM8750State *s = WM8750(dev);
628 
629     AUD_register_card(CODEC, &s->card);
630     wm8750_reset(I2C_SLAVE(s));
631 }
632 
633 #if 0
634 static void wm8750_fini(I2CSlave *i2c)
635 {
636     WM8750State *s = WM8750(i2c);
637 
638     wm8750_reset(I2C_SLAVE(s));
639     AUD_remove_card(&s->card);
640     g_free(s);
641 }
642 #endif
643 
644 void wm8750_data_req_set(DeviceState *dev, data_req_cb *data_req, void *opaque)
645 {
646     WM8750State *s = WM8750(dev);
647 
648     s->data_req = data_req;
649     s->opaque = opaque;
650 }
651 
652 void wm8750_dac_dat(void *opaque, uint32_t sample)
653 {
654     WM8750State *s = (WM8750State *) opaque;
655 
656     *(uint32_t *) &s->data_out[s->idx_out] = sample;
657     s->req_out -= 4;
658     s->idx_out += 4;
659     if (s->idx_out >= sizeof(s->data_out) || s->req_out <= 0)
660         wm8750_out_flush(s);
661 }
662 
663 void *wm8750_dac_buffer(void *opaque, int samples)
664 {
665     WM8750State *s = (WM8750State *) opaque;
666     /* XXX: Should check if there are <i>samples</i> free samples available */
667     void *ret = s->data_out + s->idx_out;
668 
669     s->idx_out += samples << 2;
670     s->req_out -= samples << 2;
671     return ret;
672 }
673 
674 void wm8750_dac_commit(void *opaque)
675 {
676     WM8750State *s = (WM8750State *) opaque;
677 
678     wm8750_out_flush(s);
679 }
680 
681 uint32_t wm8750_adc_dat(void *opaque)
682 {
683     WM8750State *s = (WM8750State *) opaque;
684     uint32_t *data;
685 
686     if (s->idx_in >= sizeof(s->data_in)) {
687         wm8750_in_load(s);
688         if (s->idx_in >= sizeof(s->data_in)) {
689             return 0x80008000; /* silence in AUDIO_FORMAT_S16 sample format */
690         }
691     }
692 
693     data = (uint32_t *) &s->data_in[s->idx_in];
694     s->req_in -= 4;
695     s->idx_in += 4;
696     return *data;
697 }
698 
699 void wm8750_set_bclk_in(void *opaque, int new_hz)
700 {
701     WM8750State *s = (WM8750State *) opaque;
702 
703     s->ext_adc_hz = new_hz;
704     s->ext_dac_hz = new_hz;
705     wm8750_clk_update(s, 1);
706 }
707 
708 static Property wm8750_properties[] = {
709     DEFINE_AUDIO_PROPERTIES(WM8750State, card),
710     DEFINE_PROP_END_OF_LIST(),
711 };
712 
713 static void wm8750_class_init(ObjectClass *klass, void *data)
714 {
715     DeviceClass *dc = DEVICE_CLASS(klass);
716     I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
717 
718     dc->realize = wm8750_realize;
719     sc->event = wm8750_event;
720     sc->recv = wm8750_rx;
721     sc->send = wm8750_tx;
722     dc->vmsd = &vmstate_wm8750;
723     device_class_set_props(dc, wm8750_properties);
724 }
725 
726 static const TypeInfo wm8750_info = {
727     .name          = TYPE_WM8750,
728     .parent        = TYPE_I2C_SLAVE,
729     .instance_size = sizeof(WM8750State),
730     .class_init    = wm8750_class_init,
731 };
732 
733 static void wm8750_register_types(void)
734 {
735     type_register_static(&wm8750_info);
736 }
737 
738 type_init(wm8750_register_types)
739