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/regulator/consumer.h>
  21 #include <linux/slab.h>
  22 #include <linux/of_device.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         struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
  44         unsigned int sysclk;
  45         unsigned int rate_constraint_list[WM8523_NUM_RATES];
  46         struct snd_pcm_hw_constraint_list rate_constraint;
  47 };
  48
  49 static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {
  50         0x8523,     /* R0 - DEVICE_ID */
  51         0x0001,     /* R1 - REVISION */
  52         0x0000,     /* R2 - PSCTRL1 */
  53         0x1812,     /* R3 - AIF_CTRL1 */
  54         0x0000,     /* R4 - AIF_CTRL2 */
  55         0x0001,     /* R5 - DAC_CTRL3 */
  56         0x0190,     /* R6 - DAC_GAINL */
  57         0x0190,     /* R7 - DAC_GAINR */
  58         0x0000,     /* R8 - ZERO_DETECT */
  59 };
  60
  61 static int wm8523_volatile_register(struct snd_soc_codec *codec, unsigned int reg)
  62 {
  63         switch (reg) {
  64         case WM8523_DEVICE_ID:
  65         case WM8523_REVISION:
  66                 return 1;
  67         default:
  68                 return 0;
  69         }
  70 }
  71
  72 static int wm8523_reset(struct snd_soc_codec *codec)
  73 {
  74         return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
  75 }
  76
  77 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
  78
  79 static const char *wm8523_zd_count_text[] = {
  80         "1024",
  81         "2048",
  82 };
  83
  84 static const struct soc_enum wm8523_zc_count =
  85         SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);
  86
  87 static const struct snd_kcontrol_new wm8523_controls[] = {
  88 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
  89                  0, 448, 0, dac_tlv),
  90 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
  91 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
  92 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
  93 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
  94 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
  95 SOC_ENUM("Zero Detect Count", wm8523_zc_count),
  96 };
  97
  98 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
  99 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 100 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
 101 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
 102 };
 103
 104 static const struct snd_soc_dapm_route wm8523_dapm_routes[] = {
 105         { "LINEVOUTL", NULL, "DAC" },
 106         { "LINEVOUTR", NULL, "DAC" },
 107 };
 108
 109 static struct {
 110         int value;
 111         int ratio;
 112 } lrclk_ratios[WM8523_NUM_RATES] = {
 113         { 1, 128 },
 114         { 2, 192 },
 115         { 3, 256 },
 116         { 4, 384 },
 117         { 5, 512 },
 118         { 6, 768 },
 119         { 7, 1152 },
 120 };
 121
 122 static int wm8523_startup(struct snd_pcm_substream *substream,
 123                           struct snd_soc_dai *dai)
 124 {
 125         struct snd_soc_codec *codec = dai->codec;
 126         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 127
 128         /* The set of sample rates that can be supported depends on the
 129          * MCLK supplied to the CODEC - enforce this.
 130          */
 131         if (!wm8523->sysclk) {
 132                 dev_err(codec->dev,
 133                         "No MCLK configured, call set_sysclk() on init\n");
 134                 return -EINVAL;
 135         }
 136
 137         snd_pcm_hw_constraint_list(substream->runtime, 0,
 138                                    SNDRV_PCM_HW_PARAM_RATE,
 139                                    &wm8523->rate_constraint);
 140
 141         return 0;
 142 }
 143
 144 static int wm8523_hw_params(struct snd_pcm_substream *substream,
 145                             struct snd_pcm_hw_params *params,
 146                             struct snd_soc_dai *dai)
 147 {
 148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 149         struct snd_soc_codec *codec = rtd->codec;
 150         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 151         int i;
 152         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 153         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
 154
 155         /* Find a supported LRCLK ratio */
 156         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 157                 if (wm8523->sysclk / params_rate(params) ==
 158                     lrclk_ratios[i].ratio)
 159                         break;
 160         }
 161
 162         /* Should never happen, should be handled by constraints */
 163         if (i == ARRAY_SIZE(lrclk_ratios)) {
 164                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 165                         wm8523->sysclk / params_rate(params));
 166                 return -EINVAL;
 167         }
 168
 169         aifctrl2 &= ~WM8523_SR_MASK;
 170         aifctrl2 |= lrclk_ratios[i].value;
 171
 172         aifctrl1 &= ~WM8523_WL_MASK;
 173         switch (params_format(params)) {
 174         case SNDRV_PCM_FORMAT_S16_LE:
 175                 break;
 176         case SNDRV_PCM_FORMAT_S20_3LE:
 177                 aifctrl1 |= 0x8;
 178                 break;
 179         case SNDRV_PCM_FORMAT_S24_LE:
 180                 aifctrl1 |= 0x10;
 181                 break;
 182         case SNDRV_PCM_FORMAT_S32_LE:
 183                 aifctrl1 |= 0x18;
 184                 break;
 185         }
 186
 187         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 188         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
 189
 190         return 0;
 191 }
 192
 193 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 194                 int clk_id, unsigned int freq, int dir)
 195 {
 196         struct snd_soc_codec *codec = codec_dai->codec;
 197         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 198         unsigned int val;
 199         int i;
 200
 201         wm8523->sysclk = freq;
 202
 203         wm8523->rate_constraint.count = 0;
 204         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 205                 val = freq / lrclk_ratios[i].ratio;
 206                 /* Check that it's a standard rate since core can't
 207                  * cope with others and having the odd rates confuses
 208                  * constraint matching.
 209                  */
 210                 switch (val) {
 211                 case 8000:
 212                 case 11025:
 213                 case 16000:
 214                 case 22050:
 215                 case 32000:
 216                 case 44100:
 217                 case 48000:
 218                 case 64000:
 219                 case 88200:
 220                 case 96000:
 221                 case 176400:
 222                 case 192000:
 223                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 224                                 val);
 225                         wm8523->rate_constraint_list[i] = val;
 226                         wm8523->rate_constraint.count++;
 227                         break;
 228                 default:
 229                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 230                                 val);
 231                 }
 232         }
 233
 234         /* Need at least one supported rate... */
 235         if (wm8523->rate_constraint.count == 0)
 236                 return -EINVAL;
 237
 238         return 0;
 239 }
 240
 241
 242 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
 243                 unsigned int fmt)
 244 {
 245         struct snd_soc_codec *codec = codec_dai->codec;
 246         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 247
 248         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
 249                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
 250
 251         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 252         case SND_SOC_DAIFMT_CBM_CFM:
 253                 aifctrl1 |= WM8523_AIF_MSTR;
 254                 break;
 255         case SND_SOC_DAIFMT_CBS_CFS:
 256                 break;
 257         default:
 258                 return -EINVAL;
 259         }
 260
 261         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 262         case SND_SOC_DAIFMT_I2S:
 263                 aifctrl1 |= 0x0002;
 264                 break;
 265         case SND_SOC_DAIFMT_RIGHT_J:
 266                 break;
 267         case SND_SOC_DAIFMT_LEFT_J:
 268                 aifctrl1 |= 0x0001;
 269                 break;
 270         case SND_SOC_DAIFMT_DSP_A:
 271                 aifctrl1 |= 0x0003;
 272                 break;
 273         case SND_SOC_DAIFMT_DSP_B:
 274                 aifctrl1 |= 0x0023;
 275                 break;
 276         default:
 277                 return -EINVAL;
 278         }
 279
 280         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 281         case SND_SOC_DAIFMT_NB_NF:
 282                 break;
 283         case SND_SOC_DAIFMT_IB_IF:
 284                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
 285                 break;
 286         case SND_SOC_DAIFMT_IB_NF:
 287                 aifctrl1 |= WM8523_BCLK_INV;
 288                 break;
 289         case SND_SOC_DAIFMT_NB_IF:
 290                 aifctrl1 |= WM8523_LRCLK_INV;
 291                 break;
 292         default:
 293                 return -EINVAL;
 294         }
 295
 296         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 297
 298         return 0;
 299 }
 300
 301 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
 302                                  enum snd_soc_bias_level level)
 303 {
 304         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 305         u16 *reg_cache = codec->reg_cache;
 306         int ret, i;
 307
 308         switch (level) {
 309         case SND_SOC_BIAS_ON:
 310                 break;
 311
 312         case SND_SOC_BIAS_PREPARE:
 313                 /* Full power on */
 314                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 315                                     WM8523_SYS_ENA_MASK, 3);
 316                 break;
 317
 318         case SND_SOC_BIAS_STANDBY:
 319                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 320                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 321                                                     wm8523->supplies);
 322                         if (ret != 0) {
 323                                 dev_err(codec->dev,
 324                                         "Failed to enable supplies: %d\n",
 325                                         ret);
 326                                 return ret;
 327                         }
 328
 329                         /* Initial power up */
 330                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
 331                                             WM8523_SYS_ENA_MASK, 1);
 332
 333                         /* Sync back default/cached values */
 334                         for (i = WM8523_AIF_CTRL1;
 335                              i < WM8523_MAX_REGISTER; i++)
 336                                 snd_soc_write(codec, i, reg_cache[i]);
 337
 338
 339                         msleep(100);
 340                 }
 341
 342                 /* Power up to mute */
 343                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 344                                     WM8523_SYS_ENA_MASK, 2);
 345
 346                 break;
 347
 348         case SND_SOC_BIAS_OFF:
 349                 /* The chip runs through the power down sequence for us. */
 350                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 351                                     WM8523_SYS_ENA_MASK, 0);
 352                 msleep(100);
 353
 354                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
 355                                        wm8523->supplies);
 356                 break;
 357         }
 358         codec->dapm.bias_level = level;
 359         return 0;
 360 }
 361
 362 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
 363
 364 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 365                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 366
 367 static const struct snd_soc_dai_ops wm8523_dai_ops = {
 368         .startup        = wm8523_startup,
 369         .hw_params      = wm8523_hw_params,
 370         .set_sysclk     = wm8523_set_dai_sysclk,
 371         .set_fmt        = wm8523_set_dai_fmt,
 372 };
 373
 374 static struct snd_soc_dai_driver wm8523_dai = {
 375         .name = "wm8523-hifi",
 376         .playback = {
 377                 .stream_name = "Playback",
 378                 .channels_min = 2,  /* Mono modes not yet supported */
 379                 .channels_max = 2,
 380                 .rates = WM8523_RATES,
 381                 .formats = WM8523_FORMATS,
 382         },
 383         .ops = &wm8523_dai_ops,
 384 };
 385
 386 #ifdef CONFIG_PM
 387 static int wm8523_suspend(struct snd_soc_codec *codec)
 388 {
 389         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 390         return 0;
 391 }
 392
 393 static int wm8523_resume(struct snd_soc_codec *codec)
 394 {
 395         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 396         return 0;
 397 }
 398 #else
 399 #define wm8523_suspend NULL
 400 #define wm8523_resume NULL
 401 #endif
 402
 403 static int wm8523_probe(struct snd_soc_codec *codec)
 404 {
 405         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 406         int ret, i;
 407
 408         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
 409         wm8523->rate_constraint.count =
 410                 ARRAY_SIZE(wm8523->rate_constraint_list);
 411
 412         ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8523->control_type);
 413         if (ret != 0) {
 414                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 415                 return ret;
 416         }
 417
 418         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
 419                 wm8523->supplies[i].supply = wm8523_supply_names[i];
 420
 421         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
 422                                  wm8523->supplies);
 423         if (ret != 0) {
 424                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 425                 return ret;
 426         }
 427
 428         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 429                                     wm8523->supplies);
 430         if (ret != 0) {
 431                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 432                 goto err_get;
 433         }
 434
 435         ret = snd_soc_read(codec, WM8523_DEVICE_ID);
 436         if (ret < 0) {
 437                 dev_err(codec->dev, "Failed to read ID register\n");
 438                 goto err_enable;
 439         }
 440         if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
 441                 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
 442                 ret = -EINVAL;
 443                 goto err_enable;
 444         }
 445
 446         ret = snd_soc_read(codec, WM8523_REVISION);
 447         if (ret < 0) {
 448                 dev_err(codec->dev, "Failed to read revision register\n");
 449                 goto err_enable;
 450         }
 451         dev_info(codec->dev, "revision %c\n",
 452                  (ret & WM8523_CHIP_REV_MASK) + 'A');
 453
 454         ret = wm8523_reset(codec);
 455         if (ret < 0) {
 456                 dev_err(codec->dev, "Failed to issue reset\n");
 457                 goto err_enable;
 458         }
 459
 460         /* Change some default settings - latch VU and enable ZC */
 461         snd_soc_update_bits(codec, WM8523_DAC_GAINR,
 462                             WM8523_DACR_VU, WM8523_DACR_VU);
 463         snd_soc_update_bits(codec, WM8523_DAC_CTRL3, WM8523_ZC, WM8523_ZC);
 464
 465         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 466
 467         /* Bias level configuration will have done an extra enable */
 468         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 469
 470         return 0;
 471
 472 err_enable:
 473         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 474 err_get:
 475         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 476
 477         return ret;
 478 }
 479
 480 static int wm8523_remove(struct snd_soc_codec *codec)
 481 {
 482         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 483
 484         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 485         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 486         return 0;
 487 }
 488
 489 static struct snd_soc_codec_driver soc_codec_dev_wm8523 = {
 490         .probe =        wm8523_probe,
 491         .remove =       wm8523_remove,
 492         .suspend =      wm8523_suspend,
 493         .resume =       wm8523_resume,
 494         .set_bias_level = wm8523_set_bias_level,
 495         .reg_cache_size = WM8523_REGISTER_COUNT,
 496         .reg_word_size = sizeof(u16),
 497         .reg_cache_default = wm8523_reg,
 498         .volatile_register = wm8523_volatile_register,
 499
 500         .controls = wm8523_controls,
 501         .num_controls = ARRAY_SIZE(wm8523_controls),
 502         .dapm_widgets = wm8523_dapm_widgets,
 503         .num_dapm_widgets = ARRAY_SIZE(wm8523_dapm_widgets),
 504         .dapm_routes = wm8523_dapm_routes,
 505         .num_dapm_routes = ARRAY_SIZE(wm8523_dapm_routes),
 506 };
 507
 508 static const struct of_device_id wm8523_of_match[] = {
 509         { .compatible = "wlf,wm8523" },
 510         { },
 511 };
 512
 513 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 514 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
 515                                       const struct i2c_device_id *id)
 516 {
 517         struct wm8523_priv *wm8523;
 518         int ret;
 519
 520         wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
 521         if (wm8523 == NULL)
 522                 return -ENOMEM;
 523
 524         i2c_set_clientdata(i2c, wm8523);
 525         wm8523->control_type = SND_SOC_I2C;
 526
 527         ret =  snd_soc_register_codec(&i2c->dev,
 528                         &soc_codec_dev_wm8523, &wm8523_dai, 1);
 529         if (ret < 0)
 530                 kfree(wm8523);
 531         return ret;
 532
 533 }
 534
 535 static __devexit int wm8523_i2c_remove(struct i2c_client *client)
 536 {
 537         snd_soc_unregister_codec(&client->dev);
 538         kfree(i2c_get_clientdata(client));
 539         return 0;
 540 }
 541
 542 static const struct i2c_device_id wm8523_i2c_id[] = {
 543         { "wm8523", 0 },
 544         { }
 545 };
 546 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
 547
 548 static struct i2c_driver wm8523_i2c_driver = {
 549         .driver = {
 550                 .name = "wm8523",
 551                 .owner = THIS_MODULE,
 552                 .of_match_table = wm8523_of_match,
 553         },
 554         .probe =    wm8523_i2c_probe,
 555         .remove =   __devexit_p(wm8523_i2c_remove),
 556         .id_table = wm8523_i2c_id,
 557 };
 558 #endif
 559
 560 static int __init wm8523_modinit(void)
 561 {
 562         int ret;
 563 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 564         ret = i2c_add_driver(&wm8523_i2c_driver);
 565         if (ret != 0) {
 566                 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
 567                        ret);
 568         }
 569 #endif
 570         return 0;
 571 }
 572 module_init(wm8523_modinit);
 573
 574 static void __exit wm8523_exit(void)
 575 {
 576 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 577         i2c_del_driver(&wm8523_i2c_driver);
 578 #endif
 579 }
 580 module_exit(wm8523_exit);
 581
 582 MODULE_DESCRIPTION("ASoC WM8523 driver");
 583 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 584 MODULE_LICENSE("GPL");