hw/audio/wm8750.c

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