sound/soc/codecs/wm8523.c

   1 /*
   2  * wm8523.c  --  WM8523 ALSA SoC Audio driver
   3  *
   4  * Copyright 2009 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/pm.h>
  19 #include <linux/i2c.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/slab.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/soc.h>
  27 #include <sound/initval.h>
  28 #include <sound/tlv.h>
  29
  30 #include "wm8523.h"
  31
  32 #define WM8523_NUM_SUPPLIES 2
  33 static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
  34         "AVDD",
  35         "LINEVDD",
  36 };
  37
  38 #define WM8523_NUM_RATES 7
  39
  40 /* codec private data */
  41 struct wm8523_priv {
  42         enum snd_soc_control_type control_type;
  43         u16 reg_cache[WM8523_REGISTER_COUNT];
  44         struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
  45         unsigned int sysclk;
  46         unsigned int rate_constraint_list[WM8523_NUM_RATES];
  47         struct snd_pcm_hw_constraint_list rate_constraint;
  48 };
  49
  50 static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {
  51         0x8523,     /* R0 - DEVICE_ID */
  52         0x0001,     /* R1 - REVISION */
  53         0x0000,     /* R2 - PSCTRL1 */
  54         0x1812,     /* R3 - AIF_CTRL1 */
  55         0x0000,     /* R4 - AIF_CTRL2 */
  56         0x0001,     /* R5 - DAC_CTRL3 */
  57         0x0190,     /* R6 - DAC_GAINL */
  58         0x0190,     /* R7 - DAC_GAINR */
  59         0x0000,     /* R8 - ZERO_DETECT */
  60 };
  61
  62 static int wm8523_volatile_register(unsigned int reg)
  63 {
  64         switch (reg) {
  65         case WM8523_DEVICE_ID:
  66         case WM8523_REVISION:
  67                 return 1;
  68         default:
  69                 return 0;
  70         }
  71 }
  72
  73 static int wm8523_reset(struct snd_soc_codec *codec)
  74 {
  75         return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
  76 }
  77
  78 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
  79
  80 static const char *wm8523_zd_count_text[] = {
  81         "1024",
  82         "2048",
  83 };
  84
  85 static const struct soc_enum wm8523_zc_count =
  86         SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);
  87
  88 static const struct snd_kcontrol_new wm8523_snd_controls[] = {
  89 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
  90                  0, 448, 0, dac_tlv),
  91 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
  92 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
  93 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
  94 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
  95 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
  96 SOC_ENUM("Zero Detect Count", wm8523_zc_count),
  97 };
  98
  99 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
 100 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 101 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
 102 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
 103 };
 104
 105 static const struct snd_soc_dapm_route intercon[] = {
 106         { "LINEVOUTL", NULL, "DAC" },
 107         { "LINEVOUTR", NULL, "DAC" },
 108 };
 109
 110 static int wm8523_add_widgets(struct snd_soc_codec *codec)
 111 {
 112         struct snd_soc_dapm_context *dapm = &codec->dapm;
 113
 114         snd_soc_dapm_new_controls(dapm, wm8523_dapm_widgets,
 115                                   ARRAY_SIZE(wm8523_dapm_widgets));
 116         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 117
 118         return 0;
 119 }
 120
 121 static struct {
 122         int value;
 123         int ratio;
 124 } lrclk_ratios[WM8523_NUM_RATES] = {
 125         { 1, 128 },
 126         { 2, 192 },
 127         { 3, 256 },
 128         { 4, 384 },
 129         { 5, 512 },
 130         { 6, 768 },
 131         { 7, 1152 },
 132 };
 133
 134 static int wm8523_startup(struct snd_pcm_substream *substream,
 135                           struct snd_soc_dai *dai)
 136 {
 137         struct snd_soc_codec *codec = dai->codec;
 138         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 139
 140         /* The set of sample rates that can be supported depends on the
 141          * MCLK supplied to the CODEC - enforce this.
 142          */
 143         if (!wm8523->sysclk) {
 144                 dev_err(codec->dev,
 145                         "No MCLK configured, call set_sysclk() on init\n");
 146                 return -EINVAL;
 147         }
 148
 149         snd_pcm_hw_constraint_list(substream->runtime, 0,
 150                                    SNDRV_PCM_HW_PARAM_RATE,
 151                                    &wm8523->rate_constraint);
 152
 153         return 0;
 154 }
 155
 156 static int wm8523_hw_params(struct snd_pcm_substream *substream,
 157                             struct snd_pcm_hw_params *params,
 158                             struct snd_soc_dai *dai)
 159 {
 160         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 161         struct snd_soc_codec *codec = rtd->codec;
 162         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 163         int i;
 164         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 165         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
 166
 167         /* Find a supported LRCLK ratio */
 168         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 169                 if (wm8523->sysclk / params_rate(params) ==
 170                     lrclk_ratios[i].ratio)
 171                         break;
 172         }
 173
 174         /* Should never happen, should be handled by constraints */
 175         if (i == ARRAY_SIZE(lrclk_ratios)) {
 176                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 177                         wm8523->sysclk / params_rate(params));
 178                 return -EINVAL;
 179         }
 180
 181         aifctrl2 &= ~WM8523_SR_MASK;
 182         aifctrl2 |= lrclk_ratios[i].value;
 183
 184         aifctrl1 &= ~WM8523_WL_MASK;
 185         switch (params_format(params)) {
 186         case SNDRV_PCM_FORMAT_S16_LE:
 187                 break;
 188         case SNDRV_PCM_FORMAT_S20_3LE:
 189                 aifctrl1 |= 0x8;
 190                 break;
 191         case SNDRV_PCM_FORMAT_S24_LE:
 192                 aifctrl1 |= 0x10;
 193                 break;
 194         case SNDRV_PCM_FORMAT_S32_LE:
 195                 aifctrl1 |= 0x18;
 196                 break;
 197         }
 198
 199         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 200         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
 201
 202         return 0;
 203 }
 204
 205 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 206                 int clk_id, unsigned int freq, int dir)
 207 {
 208         struct snd_soc_codec *codec = codec_dai->codec;
 209         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 210         unsigned int val;
 211         int i;
 212
 213         wm8523->sysclk = freq;
 214
 215         wm8523->rate_constraint.count = 0;
 216         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 217                 val = freq / lrclk_ratios[i].ratio;
 218                 /* Check that it's a standard rate since core can't
 219                  * cope with others and having the odd rates confuses
 220                  * constraint matching.
 221                  */
 222                 switch (val) {
 223                 case 8000:
 224                 case 11025:
 225                 case 16000:
 226                 case 22050:
 227                 case 32000:
 228                 case 44100:
 229                 case 48000:
 230                 case 64000:
 231                 case 88200:
 232                 case 96000:
 233                 case 176400:
 234                 case 192000:
 235                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 236                                 val);
 237                         wm8523->rate_constraint_list[i] = val;
 238                         wm8523->rate_constraint.count++;
 239                         break;
 240                 default:
 241                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 242                                 val);
 243                 }
 244         }
 245
 246         /* Need at least one supported rate... */
 247         if (wm8523->rate_constraint.count == 0)
 248                 return -EINVAL;
 249
 250         return 0;
 251 }
 252
 253
 254 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
 255                 unsigned int fmt)
 256 {
 257         struct snd_soc_codec *codec = codec_dai->codec;
 258         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 259
 260         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
 261                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
 262
 263         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 264         case SND_SOC_DAIFMT_CBM_CFM:
 265                 aifctrl1 |= WM8523_AIF_MSTR;
 266                 break;
 267         case SND_SOC_DAIFMT_CBS_CFS:
 268                 break;
 269         default:
 270                 return -EINVAL;
 271         }
 272
 273         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 274         case SND_SOC_DAIFMT_I2S:
 275                 aifctrl1 |= 0x0002;
 276                 break;
 277         case SND_SOC_DAIFMT_RIGHT_J:
 278                 break;
 279         case SND_SOC_DAIFMT_LEFT_J:
 280                 aifctrl1 |= 0x0001;
 281                 break;
 282         case SND_SOC_DAIFMT_DSP_A:
 283                 aifctrl1 |= 0x0003;
 284                 break;
 285         case SND_SOC_DAIFMT_DSP_B:
 286                 aifctrl1 |= 0x0023;
 287                 break;
 288         default:
 289                 return -EINVAL;
 290         }
 291
 292         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 293         case SND_SOC_DAIFMT_NB_NF:
 294                 break;
 295         case SND_SOC_DAIFMT_IB_IF:
 296                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
 297                 break;
 298         case SND_SOC_DAIFMT_IB_NF:
 299                 aifctrl1 |= WM8523_BCLK_INV;
 300                 break;
 301         case SND_SOC_DAIFMT_NB_IF:
 302                 aifctrl1 |= WM8523_LRCLK_INV;
 303                 break;
 304         default:
 305                 return -EINVAL;
 306         }
 307
 308         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 309
 310         return 0;
 311 }
 312
 313 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
 314                                  enum snd_soc_bias_level level)
 315 {
 316         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 317         int ret, i;
 318
 319         switch (level) {
 320         case SND_SOC_BIAS_ON:
 321                 break;
 322
 323         case SND_SOC_BIAS_PREPARE:
 324                 /* Full power on */
 325                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 326                                     WM8523_SYS_ENA_MASK, 3);
 327                 break;
 328
 329         case SND_SOC_BIAS_STANDBY:
 330                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 331                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 332                                                     wm8523->supplies);
 333                         if (ret != 0) {
 334                                 dev_err(codec->dev,
 335                                         "Failed to enable supplies: %d\n",
 336                                         ret);
 337                                 return ret;
 338                         }
 339
 340                         /* Initial power up */
 341                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
 342                                             WM8523_SYS_ENA_MASK, 1);
 343
 344                         /* Sync back default/cached values */
 345                         for (i = WM8523_AIF_CTRL1;
 346                              i < WM8523_MAX_REGISTER; i++)
 347                                 snd_soc_write(codec, i, wm8523->reg_cache[i]);
 348
 349
 350                         msleep(100);
 351                 }
 352
 353                 /* Power up to mute */
 354                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 355                                     WM8523_SYS_ENA_MASK, 2);
 356
 357                 break;
 358
 359         case SND_SOC_BIAS_OFF:
 360                 /* The chip runs through the power down sequence for us. */
 361                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 362                                     WM8523_SYS_ENA_MASK, 0);
 363                 msleep(100);
 364
 365                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
 366                                        wm8523->supplies);
 367                 break;
 368         }
 369         codec->dapm.bias_level = level;
 370         return 0;
 371 }
 372
 373 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
 374
 375 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 376                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 377
 378 static struct snd_soc_dai_ops wm8523_dai_ops = {
 379         .startup        = wm8523_startup,
 380         .hw_params      = wm8523_hw_params,
 381         .set_sysclk     = wm8523_set_dai_sysclk,
 382         .set_fmt        = wm8523_set_dai_fmt,
 383 };
 384
 385 static struct snd_soc_dai_driver wm8523_dai = {
 386         .name = "wm8523-hifi",
 387         .playback = {
 388                 .stream_name = "Playback",
 389                 .channels_min = 2,  /* Mono modes not yet supported */
 390                 .channels_max = 2,
 391                 .rates = WM8523_RATES,
 392                 .formats = WM8523_FORMATS,
 393         },
 394         .ops = &wm8523_dai_ops,
 395 };
 396
 397 #ifdef CONFIG_PM
 398 static int wm8523_suspend(struct snd_soc_codec *codec, pm_message_t state)
 399 {
 400         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 401         return 0;
 402 }
 403
 404 static int wm8523_resume(struct snd_soc_codec *codec)
 405 {
 406         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 407         return 0;
 408 }
 409 #else
 410 #define wm8523_suspend NULL
 411 #define wm8523_resume NULL
 412 #endif
 413
 414 static int wm8523_probe(struct snd_soc_codec *codec)
 415 {
 416         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 417         int ret, i;
 418
 419         codec->hw_write = (hw_write_t)i2c_master_send;
 420         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
 421         wm8523->rate_constraint.count =
 422                 ARRAY_SIZE(wm8523->rate_constraint_list);
 423
 424         ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8523->control_type);
 425         if (ret != 0) {
 426                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 427                 return ret;
 428         }
 429
 430         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
 431                 wm8523->supplies[i].supply = wm8523_supply_names[i];
 432
 433         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
 434                                  wm8523->supplies);
 435         if (ret != 0) {
 436                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 437                 return ret;
 438         }
 439
 440         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 441                                     wm8523->supplies);
 442         if (ret != 0) {
 443                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 444                 goto err_get;
 445         }
 446
 447         ret = snd_soc_read(codec, WM8523_DEVICE_ID);
 448         if (ret < 0) {
 449                 dev_err(codec->dev, "Failed to read ID register\n");
 450                 goto err_enable;
 451         }
 452         if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
 453                 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
 454                 ret = -EINVAL;
 455                 goto err_enable;
 456         }
 457
 458         ret = snd_soc_read(codec, WM8523_REVISION);
 459         if (ret < 0) {
 460                 dev_err(codec->dev, "Failed to read revision register\n");
 461                 goto err_enable;
 462         }
 463         dev_info(codec->dev, "revision %c\n",
 464                  (ret & WM8523_CHIP_REV_MASK) + 'A');
 465
 466         ret = wm8523_reset(codec);
 467         if (ret < 0) {
 468                 dev_err(codec->dev, "Failed to issue reset\n");
 469                 goto err_enable;
 470         }
 471
 472         /* Change some default settings - latch VU and enable ZC */
 473         wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU;
 474         wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC;
 475
 476         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 477
 478         /* Bias level configuration will have done an extra enable */
 479         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 480
 481         snd_soc_add_controls(codec, wm8523_snd_controls,
 482                              ARRAY_SIZE(wm8523_snd_controls));
 483         wm8523_add_widgets(codec);
 484
 485         return 0;
 486
 487 err_enable:
 488         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 489 err_get:
 490         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 491
 492         return ret;
 493 }
 494
 495 static int wm8523_remove(struct snd_soc_codec *codec)
 496 {
 497         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 498
 499         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 500         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 501         return 0;
 502 }
 503
 504 static struct snd_soc_codec_driver soc_codec_dev_wm8523 = {
 505         .probe =        wm8523_probe,
 506         .remove =       wm8523_remove,
 507         .suspend =      wm8523_suspend,
 508         .resume =       wm8523_resume,
 509         .set_bias_level = wm8523_set_bias_level,
 510         .reg_cache_size = WM8523_REGISTER_COUNT,
 511         .reg_word_size = sizeof(u16),
 512         .reg_cache_default = wm8523_reg,
 513         .volatile_register = wm8523_volatile_register,
 514 };
 515
 516 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 517 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
 518                                       const struct i2c_device_id *id)
 519 {
 520         struct wm8523_priv *wm8523;
 521         int ret;
 522
 523         wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
 524         if (wm8523 == NULL)
 525                 return -ENOMEM;
 526
 527         i2c_set_clientdata(i2c, wm8523);
 528         wm8523->control_type = SND_SOC_I2C;
 529
 530         ret =  snd_soc_register_codec(&i2c->dev,
 531                         &soc_codec_dev_wm8523, &wm8523_dai, 1);
 532         if (ret < 0)
 533                 kfree(wm8523);
 534         return ret;
 535
 536 }
 537
 538 static __devexit int wm8523_i2c_remove(struct i2c_client *client)
 539 {
 540         snd_soc_unregister_codec(&client->dev);
 541         kfree(i2c_get_clientdata(client));
 542         return 0;
 543 }
 544
 545 static const struct i2c_device_id wm8523_i2c_id[] = {
 546         { "wm8523", 0 },
 547         { }
 548 };
 549 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
 550
 551 static struct i2c_driver wm8523_i2c_driver = {
 552         .driver = {
 553                 .name = "wm8523-codec",
 554                 .owner = THIS_MODULE,
 555         },
 556         .probe =    wm8523_i2c_probe,
 557         .remove =   __devexit_p(wm8523_i2c_remove),
 558         .id_table = wm8523_i2c_id,
 559 };
 560 #endif
 561
 562 static int __init wm8523_modinit(void)
 563 {
 564         int ret;
 565 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 566         ret = i2c_add_driver(&wm8523_i2c_driver);
 567         if (ret != 0) {
 568                 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
 569                        ret);
 570         }
 571 #endif
 572         return 0;
 573 }
 574 module_init(wm8523_modinit);
 575
 576 static void __exit wm8523_exit(void)
 577 {
 578 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 579         i2c_del_driver(&wm8523_i2c_driver);
 580 #endif
 581 }
 582 module_exit(wm8523_exit);
 583
 584 MODULE_DESCRIPTION("ASoC WM8523 driver");
 585 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 586 MODULE_LICENSE("GPL");