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 <linux/of_device.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28 #include <sound/initval.h>
  29 #include <sound/tlv.h>
  30
  31 #include "wm8523.h"
  32
  33 #define WM8523_NUM_SUPPLIES 2
  34 static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
  35         "AVDD",
  36         "LINEVDD",
  37 };
  38
  39 #define WM8523_NUM_RATES 7
  40
  41 /* codec private data */
  42 struct wm8523_priv {
  43         enum snd_soc_control_type control_type;
  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(struct snd_soc_codec *codec, 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_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 wm8523_dapm_routes[] = {
 106         { "LINEVOUTL", NULL, "DAC" },
 107         { "LINEVOUTR", NULL, "DAC" },
 108 };
 109
 110 static struct {
 111         int value;
 112         int ratio;
 113 } lrclk_ratios[WM8523_NUM_RATES] = {
 114         { 1, 128 },
 115         { 2, 192 },
 116         { 3, 256 },
 117         { 4, 384 },
 118         { 5, 512 },
 119         { 6, 768 },
 120         { 7, 1152 },
 121 };
 122
 123 static int wm8523_startup(struct snd_pcm_substream *substream,
 124                           struct snd_soc_dai *dai)
 125 {
 126         struct snd_soc_codec *codec = dai->codec;
 127         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 128
 129         /* The set of sample rates that can be supported depends on the
 130          * MCLK supplied to the CODEC - enforce this.
 131          */
 132         if (!wm8523->sysclk) {
 133                 dev_err(codec->dev,
 134                         "No MCLK configured, call set_sysclk() on init\n");
 135                 return -EINVAL;
 136         }
 137
 138         snd_pcm_hw_constraint_list(substream->runtime, 0,
 139                                    SNDRV_PCM_HW_PARAM_RATE,
 140                                    &wm8523->rate_constraint);
 141
 142         return 0;
 143 }
 144
 145 static int wm8523_hw_params(struct snd_pcm_substream *substream,
 146                             struct snd_pcm_hw_params *params,
 147                             struct snd_soc_dai *dai)
 148 {
 149         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 150         struct snd_soc_codec *codec = rtd->codec;
 151         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 152         int i;
 153         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 154         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
 155
 156         /* Find a supported LRCLK ratio */
 157         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 158                 if (wm8523->sysclk / params_rate(params) ==
 159                     lrclk_ratios[i].ratio)
 160                         break;
 161         }
 162
 163         /* Should never happen, should be handled by constraints */
 164         if (i == ARRAY_SIZE(lrclk_ratios)) {
 165                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 166                         wm8523->sysclk / params_rate(params));
 167                 return -EINVAL;
 168         }
 169
 170         aifctrl2 &= ~WM8523_SR_MASK;
 171         aifctrl2 |= lrclk_ratios[i].value;
 172
 173         aifctrl1 &= ~WM8523_WL_MASK;
 174         switch (params_format(params)) {
 175         case SNDRV_PCM_FORMAT_S16_LE:
 176                 break;
 177         case SNDRV_PCM_FORMAT_S20_3LE:
 178                 aifctrl1 |= 0x8;
 179                 break;
 180         case SNDRV_PCM_FORMAT_S24_LE:
 181                 aifctrl1 |= 0x10;
 182                 break;
 183         case SNDRV_PCM_FORMAT_S32_LE:
 184                 aifctrl1 |= 0x18;
 185                 break;
 186         }
 187
 188         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 189         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
 190
 191         return 0;
 192 }
 193
 194 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 195                 int clk_id, unsigned int freq, int dir)
 196 {
 197         struct snd_soc_codec *codec = codec_dai->codec;
 198         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 199         unsigned int val;
 200         int i;
 201
 202         wm8523->sysclk = freq;
 203
 204         wm8523->rate_constraint.count = 0;
 205         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 206                 val = freq / lrclk_ratios[i].ratio;
 207                 /* Check that it's a standard rate since core can't
 208                  * cope with others and having the odd rates confuses
 209                  * constraint matching.
 210                  */
 211                 switch (val) {
 212                 case 8000:
 213                 case 11025:
 214                 case 16000:
 215                 case 22050:
 216                 case 32000:
 217                 case 44100:
 218                 case 48000:
 219                 case 64000:
 220                 case 88200:
 221                 case 96000:
 222                 case 176400:
 223                 case 192000:
 224                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 225                                 val);
 226                         wm8523->rate_constraint_list[i] = val;
 227                         wm8523->rate_constraint.count++;
 228                         break;
 229                 default:
 230                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 231                                 val);
 232                 }
 233         }
 234
 235         /* Need at least one supported rate... */
 236         if (wm8523->rate_constraint.count == 0)
 237                 return -EINVAL;
 238
 239         return 0;
 240 }
 241
 242
 243 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
 244                 unsigned int fmt)
 245 {
 246         struct snd_soc_codec *codec = codec_dai->codec;
 247         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 248
 249         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
 250                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
 251
 252         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 253         case SND_SOC_DAIFMT_CBM_CFM:
 254                 aifctrl1 |= WM8523_AIF_MSTR;
 255                 break;
 256         case SND_SOC_DAIFMT_CBS_CFS:
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261
 262         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 263         case SND_SOC_DAIFMT_I2S:
 264                 aifctrl1 |= 0x0002;
 265                 break;
 266         case SND_SOC_DAIFMT_RIGHT_J:
 267                 break;
 268         case SND_SOC_DAIFMT_LEFT_J:
 269                 aifctrl1 |= 0x0001;
 270                 break;
 271         case SND_SOC_DAIFMT_DSP_A:
 272                 aifctrl1 |= 0x0003;
 273                 break;
 274         case SND_SOC_DAIFMT_DSP_B:
 275                 aifctrl1 |= 0x0023;
 276                 break;
 277         default:
 278                 return -EINVAL;
 279         }
 280
 281         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 282         case SND_SOC_DAIFMT_NB_NF:
 283                 break;
 284         case SND_SOC_DAIFMT_IB_IF:
 285                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
 286                 break;
 287         case SND_SOC_DAIFMT_IB_NF:
 288                 aifctrl1 |= WM8523_BCLK_INV;
 289                 break;
 290         case SND_SOC_DAIFMT_NB_IF:
 291                 aifctrl1 |= WM8523_LRCLK_INV;
 292                 break;
 293         default:
 294                 return -EINVAL;
 295         }
 296
 297         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 298
 299         return 0;
 300 }
 301
 302 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
 303                                  enum snd_soc_bias_level level)
 304 {
 305         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 306         u16 *reg_cache = codec->reg_cache;
 307         int ret, i;
 308
 309         switch (level) {
 310         case SND_SOC_BIAS_ON:
 311                 break;
 312
 313         case SND_SOC_BIAS_PREPARE:
 314                 /* Full power on */
 315                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 316                                     WM8523_SYS_ENA_MASK, 3);
 317                 break;
 318
 319         case SND_SOC_BIAS_STANDBY:
 320                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 321                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 322                                                     wm8523->supplies);
 323                         if (ret != 0) {
 324                                 dev_err(codec->dev,
 325                                         "Failed to enable supplies: %d\n",
 326                                         ret);
 327                                 return ret;
 328                         }
 329
 330                         /* Initial power up */
 331                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
 332                                             WM8523_SYS_ENA_MASK, 1);
 333
 334                         /* Sync back default/cached values */
 335                         for (i = WM8523_AIF_CTRL1;
 336                              i < WM8523_MAX_REGISTER; i++)
 337                                 snd_soc_write(codec, i, reg_cache[i]);
 338
 339
 340                         msleep(100);
 341                 }
 342
 343                 /* Power up to mute */
 344                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 345                                     WM8523_SYS_ENA_MASK, 2);
 346
 347                 break;
 348
 349         case SND_SOC_BIAS_OFF:
 350                 /* The chip runs through the power down sequence for us. */
 351                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 352                                     WM8523_SYS_ENA_MASK, 0);
 353                 msleep(100);
 354
 355                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
 356                                        wm8523->supplies);
 357                 break;
 358         }
 359         codec->dapm.bias_level = level;
 360         return 0;
 361 }
 362
 363 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
 364
 365 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 366                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 367
 368 static struct snd_soc_dai_ops wm8523_dai_ops = {
 369         .startup        = wm8523_startup,
 370         .hw_params      = wm8523_hw_params,
 371         .set_sysclk     = wm8523_set_dai_sysclk,
 372         .set_fmt        = wm8523_set_dai_fmt,
 373 };
 374
 375 static struct snd_soc_dai_driver wm8523_dai = {
 376         .name = "wm8523-hifi",
 377         .playback = {
 378                 .stream_name = "Playback",
 379                 .channels_min = 2,  /* Mono modes not yet supported */
 380                 .channels_max = 2,
 381                 .rates = WM8523_RATES,
 382                 .formats = WM8523_FORMATS,
 383         },
 384         .ops = &wm8523_dai_ops,
 385 };
 386
 387 #ifdef CONFIG_PM
 388 static int wm8523_suspend(struct snd_soc_codec *codec, pm_message_t state)
 389 {
 390         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 391         return 0;
 392 }
 393
 394 static int wm8523_resume(struct snd_soc_codec *codec)
 395 {
 396         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 397         return 0;
 398 }
 399 #else
 400 #define wm8523_suspend NULL
 401 #define wm8523_resume NULL
 402 #endif
 403
 404 static int wm8523_probe(struct snd_soc_codec *codec)
 405 {
 406         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 407         int ret, i;
 408
 409         codec->hw_write = (hw_write_t)i2c_master_send;
 410         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
 411         wm8523->rate_constraint.count =
 412                 ARRAY_SIZE(wm8523->rate_constraint_list);
 413
 414         ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8523->control_type);
 415         if (ret != 0) {
 416                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 417                 return ret;
 418         }
 419
 420         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
 421                 wm8523->supplies[i].supply = wm8523_supply_names[i];
 422
 423         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
 424                                  wm8523->supplies);
 425         if (ret != 0) {
 426                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 427                 return ret;
 428         }
 429
 430         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 431                                     wm8523->supplies);
 432         if (ret != 0) {
 433                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 434                 goto err_get;
 435         }
 436
 437         ret = snd_soc_read(codec, WM8523_DEVICE_ID);
 438         if (ret < 0) {
 439                 dev_err(codec->dev, "Failed to read ID register\n");
 440                 goto err_enable;
 441         }
 442         if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
 443                 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
 444                 ret = -EINVAL;
 445                 goto err_enable;
 446         }
 447
 448         ret = snd_soc_read(codec, WM8523_REVISION);
 449         if (ret < 0) {
 450                 dev_err(codec->dev, "Failed to read revision register\n");
 451                 goto err_enable;
 452         }
 453         dev_info(codec->dev, "revision %c\n",
 454                  (ret & WM8523_CHIP_REV_MASK) + 'A');
 455
 456         ret = wm8523_reset(codec);
 457         if (ret < 0) {
 458                 dev_err(codec->dev, "Failed to issue reset\n");
 459                 goto err_enable;
 460         }
 461
 462         /* Change some default settings - latch VU and enable ZC */
 463         snd_soc_update_bits(codec, WM8523_DAC_GAINR,
 464                             WM8523_DACR_VU, WM8523_DACR_VU);
 465         snd_soc_update_bits(codec, WM8523_DAC_CTRL3, WM8523_ZC, WM8523_ZC);
 466
 467         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 468
 469         /* Bias level configuration will have done an extra enable */
 470         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 471
 472         return 0;
 473
 474 err_enable:
 475         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 476 err_get:
 477         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 478
 479         return ret;
 480 }
 481
 482 static int wm8523_remove(struct snd_soc_codec *codec)
 483 {
 484         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 485
 486         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 487         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 488         return 0;
 489 }
 490
 491 static struct snd_soc_codec_driver soc_codec_dev_wm8523 = {
 492         .probe =        wm8523_probe,
 493         .remove =       wm8523_remove,
 494         .suspend =      wm8523_suspend,
 495         .resume =       wm8523_resume,
 496         .set_bias_level = wm8523_set_bias_level,
 497         .reg_cache_size = WM8523_REGISTER_COUNT,
 498         .reg_word_size = sizeof(u16),
 499         .reg_cache_default = wm8523_reg,
 500         .volatile_register = wm8523_volatile_register,
 501
 502         .controls = wm8523_controls,
 503         .num_controls = ARRAY_SIZE(wm8523_controls),
 504         .dapm_widgets = wm8523_dapm_widgets,
 505         .num_dapm_widgets = ARRAY_SIZE(wm8523_dapm_widgets),
 506         .dapm_routes = wm8523_dapm_routes,
 507         .num_dapm_routes = ARRAY_SIZE(wm8523_dapm_routes),
 508 };
 509
 510 static const struct of_device_id wm8523_of_match[] = {
 511         { .compatible = "wlf,wm8523" },
 512         { },
 513 };
 514
 515 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 516 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
 517                                       const struct i2c_device_id *id)
 518 {
 519         struct wm8523_priv *wm8523;
 520         int ret;
 521
 522         wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
 523         if (wm8523 == NULL)
 524                 return -ENOMEM;
 525
 526         i2c_set_clientdata(i2c, wm8523);
 527         wm8523->control_type = SND_SOC_I2C;
 528
 529         ret =  snd_soc_register_codec(&i2c->dev,
 530                         &soc_codec_dev_wm8523, &wm8523_dai, 1);
 531         if (ret < 0)
 532                 kfree(wm8523);
 533         return ret;
 534
 535 }
 536
 537 static __devexit int wm8523_i2c_remove(struct i2c_client *client)
 538 {
 539         snd_soc_unregister_codec(&client->dev);
 540         kfree(i2c_get_clientdata(client));
 541         return 0;
 542 }
 543
 544 static const struct i2c_device_id wm8523_i2c_id[] = {
 545         { "wm8523", 0 },
 546         { }
 547 };
 548 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
 549
 550 static struct i2c_driver wm8523_i2c_driver = {
 551         .driver = {
 552                 .name = "wm8523",
 553                 .owner = THIS_MODULE,
 554                 .of_match_table = wm8523_of_match,
 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");