kernel/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/regmap.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         struct regmap *regmap;
  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 struct reg_default wm8523_reg_defaults[] = {
  51         { 2, 0x0000 },     /* R2 - PSCTRL1 */
  52         { 3, 0x1812 },     /* R3 - AIF_CTRL1 */
  53         { 4, 0x0000 },     /* R4 - AIF_CTRL2 */
  54         { 5, 0x0001 },     /* R5 - DAC_CTRL3 */
  55         { 6, 0x0190 },     /* R6 - DAC_GAINL */
  56         { 7, 0x0190 },     /* R7 - DAC_GAINR */
  57         { 8, 0x0000 },     /* R8 - ZERO_DETECT */
  58 };
  59
  60 static bool wm8523_volatile_register(struct device *dev, unsigned int reg)
  61 {
  62         switch (reg) {
  63         case WM8523_DEVICE_ID:
  64         case WM8523_REVISION:
  65                 return true;
  66         default:
  67                 return false;
  68         }
  69 }
  70
  71 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
  72
  73 static const char *wm8523_zd_count_text[] = {
  74         "1024",
  75         "2048",
  76 };
  77
  78 static SOC_ENUM_SINGLE_DECL(wm8523_zc_count, WM8523_ZERO_DETECT, 0,
  79                             wm8523_zd_count_text);
  80
  81 static const struct snd_kcontrol_new wm8523_controls[] = {
  82 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
  83                  0, 448, 0, dac_tlv),
  84 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
  85 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
  86 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
  87 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
  88 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
  89 SOC_ENUM("Zero Detect Count", wm8523_zc_count),
  90 };
  91
  92 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
  93 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
  94 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
  95 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
  96 };
  97
  98 static const struct snd_soc_dapm_route wm8523_dapm_routes[] = {
  99         { "LINEVOUTL", NULL, "DAC" },
 100         { "LINEVOUTR", NULL, "DAC" },
 101 };
 102
 103 static struct {
 104         int value;
 105         int ratio;
 106 } lrclk_ratios[WM8523_NUM_RATES] = {
 107         { 1, 128 },
 108         { 2, 192 },
 109         { 3, 256 },
 110         { 4, 384 },
 111         { 5, 512 },
 112         { 6, 768 },
 113         { 7, 1152 },
 114 };
 115
 116 static int wm8523_startup(struct snd_pcm_substream *substream,
 117                           struct snd_soc_dai *dai)
 118 {
 119         struct snd_soc_codec *codec = dai->codec;
 120         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 121
 122         /* The set of sample rates that can be supported depends on the
 123          * MCLK supplied to the CODEC - enforce this.
 124          */
 125         if (!wm8523->sysclk) {
 126                 dev_err(codec->dev,
 127                         "No MCLK configured, call set_sysclk() on init\n");
 128                 return -EINVAL;
 129         }
 130
 131         snd_pcm_hw_constraint_list(substream->runtime, 0,
 132                                    SNDRV_PCM_HW_PARAM_RATE,
 133                                    &wm8523->rate_constraint);
 134
 135         return 0;
 136 }
 137
 138 static int wm8523_hw_params(struct snd_pcm_substream *substream,
 139                             struct snd_pcm_hw_params *params,
 140                             struct snd_soc_dai *dai)
 141 {
 142         struct snd_soc_codec *codec = dai->codec;
 143         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 144         int i;
 145         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 146         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
 147
 148         /* Find a supported LRCLK ratio */
 149         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 150                 if (wm8523->sysclk / params_rate(params) ==
 151                     lrclk_ratios[i].ratio)
 152                         break;
 153         }
 154
 155         /* Should never happen, should be handled by constraints */
 156         if (i == ARRAY_SIZE(lrclk_ratios)) {
 157                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 158                         wm8523->sysclk / params_rate(params));
 159                 return -EINVAL;
 160         }
 161
 162         aifctrl2 &= ~WM8523_SR_MASK;
 163         aifctrl2 |= lrclk_ratios[i].value;
 164
 165         aifctrl1 &= ~WM8523_WL_MASK;
 166         switch (params_width(params)) {
 167         case 16:
 168                 break;
 169         case 20:
 170                 aifctrl1 |= 0x8;
 171                 break;
 172         case 24:
 173                 aifctrl1 |= 0x10;
 174                 break;
 175         case 32:
 176                 aifctrl1 |= 0x18;
 177                 break;
 178         }
 179
 180         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 181         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
 182
 183         return 0;
 184 }
 185
 186 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 187                 int clk_id, unsigned int freq, int dir)
 188 {
 189         struct snd_soc_codec *codec = codec_dai->codec;
 190         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 191         unsigned int val;
 192         int i;
 193
 194         wm8523->sysclk = freq;
 195
 196         wm8523->rate_constraint.count = 0;
 197         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 198                 val = freq / lrclk_ratios[i].ratio;
 199                 /* Check that it's a standard rate since core can't
 200                  * cope with others and having the odd rates confuses
 201                  * constraint matching.
 202                  */
 203                 switch (val) {
 204                 case 8000:
 205                 case 11025:
 206                 case 16000:
 207                 case 22050:
 208                 case 32000:
 209                 case 44100:
 210                 case 48000:
 211                 case 64000:
 212                 case 88200:
 213                 case 96000:
 214                 case 176400:
 215                 case 192000:
 216                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 217                                 val);
 218                         wm8523->rate_constraint_list[i] = val;
 219                         wm8523->rate_constraint.count++;
 220                         break;
 221                 default:
 222                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 223                                 val);
 224                 }
 225         }
 226
 227         /* Need at least one supported rate... */
 228         if (wm8523->rate_constraint.count == 0)
 229                 return -EINVAL;
 230
 231         return 0;
 232 }
 233
 234
 235 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
 236                 unsigned int fmt)
 237 {
 238         struct snd_soc_codec *codec = codec_dai->codec;
 239         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 240
 241         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
 242                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
 243
 244         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 245         case SND_SOC_DAIFMT_CBM_CFM:
 246                 aifctrl1 |= WM8523_AIF_MSTR;
 247                 break;
 248         case SND_SOC_DAIFMT_CBS_CFS:
 249                 break;
 250         default:
 251                 return -EINVAL;
 252         }
 253
 254         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 255         case SND_SOC_DAIFMT_I2S:
 256                 aifctrl1 |= 0x0002;
 257                 break;
 258         case SND_SOC_DAIFMT_RIGHT_J:
 259                 break;
 260         case SND_SOC_DAIFMT_LEFT_J:
 261                 aifctrl1 |= 0x0001;
 262                 break;
 263         case SND_SOC_DAIFMT_DSP_A:
 264                 aifctrl1 |= 0x0003;
 265                 break;
 266         case SND_SOC_DAIFMT_DSP_B:
 267                 aifctrl1 |= 0x0023;
 268                 break;
 269         default:
 270                 return -EINVAL;
 271         }
 272
 273         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 274         case SND_SOC_DAIFMT_NB_NF:
 275                 break;
 276         case SND_SOC_DAIFMT_IB_IF:
 277                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
 278                 break;
 279         case SND_SOC_DAIFMT_IB_NF:
 280                 aifctrl1 |= WM8523_BCLK_INV;
 281                 break;
 282         case SND_SOC_DAIFMT_NB_IF:
 283                 aifctrl1 |= WM8523_LRCLK_INV;
 284                 break;
 285         default:
 286                 return -EINVAL;
 287         }
 288
 289         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 290
 291         return 0;
 292 }
 293
 294 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
 295                                  enum snd_soc_bias_level level)
 296 {
 297         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 298         int ret;
 299
 300         switch (level) {
 301         case SND_SOC_BIAS_ON:
 302                 break;
 303
 304         case SND_SOC_BIAS_PREPARE:
 305                 /* Full power on */
 306                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 307                                     WM8523_SYS_ENA_MASK, 3);
 308                 break;
 309
 310         case SND_SOC_BIAS_STANDBY:
 311                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 312                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 313                                                     wm8523->supplies);
 314                         if (ret != 0) {
 315                                 dev_err(codec->dev,
 316                                         "Failed to enable supplies: %d\n",
 317                                         ret);
 318                                 return ret;
 319                         }
 320
 321                         /* Sync back default/cached values */
 322                         regcache_sync(wm8523->regmap);
 323
 324                         /* Initial power up */
 325                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
 326                                             WM8523_SYS_ENA_MASK, 1);
 327
 328                         msleep(100);
 329                 }
 330
 331                 /* Power up to mute */
 332                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 333                                     WM8523_SYS_ENA_MASK, 2);
 334
 335                 break;
 336
 337         case SND_SOC_BIAS_OFF:
 338                 /* The chip runs through the power down sequence for us. */
 339                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 340                                     WM8523_SYS_ENA_MASK, 0);
 341                 msleep(100);
 342
 343                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
 344                                        wm8523->supplies);
 345                 break;
 346         }
 347         codec->dapm.bias_level = level;
 348         return 0;
 349 }
 350
 351 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
 352
 353 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 354                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 355
 356 static const struct snd_soc_dai_ops wm8523_dai_ops = {
 357         .startup        = wm8523_startup,
 358         .hw_params      = wm8523_hw_params,
 359         .set_sysclk     = wm8523_set_dai_sysclk,
 360         .set_fmt        = wm8523_set_dai_fmt,
 361 };
 362
 363 static struct snd_soc_dai_driver wm8523_dai = {
 364         .name = "wm8523-hifi",
 365         .playback = {
 366                 .stream_name = "Playback",
 367                 .channels_min = 2,  /* Mono modes not yet supported */
 368                 .channels_max = 2,
 369                 .rates = WM8523_RATES,
 370                 .formats = WM8523_FORMATS,
 371         },
 372         .ops = &wm8523_dai_ops,
 373 };
 374
 375 static int wm8523_probe(struct snd_soc_codec *codec)
 376 {
 377         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 378
 379         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
 380         wm8523->rate_constraint.count =
 381                 ARRAY_SIZE(wm8523->rate_constraint_list);
 382
 383         /* Change some default settings - latch VU and enable ZC */
 384         snd_soc_update_bits(codec, WM8523_DAC_GAINR,
 385                             WM8523_DACR_VU, WM8523_DACR_VU);
 386         snd_soc_update_bits(codec, WM8523_DAC_CTRL3, WM8523_ZC, WM8523_ZC);
 387
 388         return 0;
 389 }
 390
 391 static struct snd_soc_codec_driver soc_codec_dev_wm8523 = {
 392         .probe =        wm8523_probe,
 393         .set_bias_level = wm8523_set_bias_level,
 394         .suspend_bias_off = true,
 395
 396         .controls = wm8523_controls,
 397         .num_controls = ARRAY_SIZE(wm8523_controls),
 398         .dapm_widgets = wm8523_dapm_widgets,
 399         .num_dapm_widgets = ARRAY_SIZE(wm8523_dapm_widgets),
 400         .dapm_routes = wm8523_dapm_routes,
 401         .num_dapm_routes = ARRAY_SIZE(wm8523_dapm_routes),
 402 };
 403
 404 static const struct of_device_id wm8523_of_match[] = {
 405         { .compatible = "wlf,wm8523" },
 406         { },
 407 };
 408
 409 static const struct regmap_config wm8523_regmap = {
 410         .reg_bits = 8,
 411         .val_bits = 16,
 412         .max_register = WM8523_ZERO_DETECT,
 413
 414         .reg_defaults = wm8523_reg_defaults,
 415         .num_reg_defaults = ARRAY_SIZE(wm8523_reg_defaults),
 416         .cache_type = REGCACHE_RBTREE,
 417
 418         .volatile_reg = wm8523_volatile_register,
 419 };
 420
 421 #if IS_ENABLED(CONFIG_I2C)
 422 static int wm8523_i2c_probe(struct i2c_client *i2c,
 423                             const struct i2c_device_id *id)
 424 {
 425         struct wm8523_priv *wm8523;
 426         unsigned int val;
 427         int ret, i;
 428
 429         wm8523 = devm_kzalloc(&i2c->dev, sizeof(struct wm8523_priv),
 430                               GFP_KERNEL);
 431         if (wm8523 == NULL)
 432                 return -ENOMEM;
 433
 434         wm8523->regmap = devm_regmap_init_i2c(i2c, &wm8523_regmap);
 435         if (IS_ERR(wm8523->regmap)) {
 436                 ret = PTR_ERR(wm8523->regmap);
 437                 dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
 438                 return ret;
 439         }
 440
 441         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
 442                 wm8523->supplies[i].supply = wm8523_supply_names[i];
 443
 444         ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8523->supplies),
 445                                       wm8523->supplies);
 446         if (ret != 0) {
 447                 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
 448                 return ret;
 449         }
 450
 451         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 452                                     wm8523->supplies);
 453         if (ret != 0) {
 454                 dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
 455                 return ret;
 456         }
 457
 458         ret = regmap_read(wm8523->regmap, WM8523_DEVICE_ID, &val);
 459         if (ret < 0) {
 460                 dev_err(&i2c->dev, "Failed to read ID register\n");
 461                 goto err_enable;
 462         }
 463         if (val != 0x8523) {
 464                 dev_err(&i2c->dev, "Device is not a WM8523, ID is %x\n", ret);
 465                 ret = -EINVAL;
 466                 goto err_enable;
 467         }
 468
 469         ret = regmap_read(wm8523->regmap, WM8523_REVISION, &val);
 470         if (ret < 0) {
 471                 dev_err(&i2c->dev, "Failed to read revision register\n");
 472                 goto err_enable;
 473         }
 474         dev_info(&i2c->dev, "revision %c\n",
 475                  (val & WM8523_CHIP_REV_MASK) + 'A');
 476
 477         ret = regmap_write(wm8523->regmap, WM8523_DEVICE_ID, 0x8523);
 478         if (ret != 0) {
 479                 dev_err(&i2c->dev, "Failed to reset device: %d\n", ret);
 480                 goto err_enable;
 481         }
 482
 483         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 484
 485         i2c_set_clientdata(i2c, wm8523);
 486
 487         ret =  snd_soc_register_codec(&i2c->dev,
 488                         &soc_codec_dev_wm8523, &wm8523_dai, 1);
 489
 490         return ret;
 491
 492 err_enable:
 493         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 494         return ret;
 495 }
 496
 497 static int wm8523_i2c_remove(struct i2c_client *client)
 498 {
 499         snd_soc_unregister_codec(&client->dev);
 500         return 0;
 501 }
 502
 503 static const struct i2c_device_id wm8523_i2c_id[] = {
 504         { "wm8523", 0 },
 505         { }
 506 };
 507 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
 508
 509 static struct i2c_driver wm8523_i2c_driver = {
 510         .driver = {
 511                 .name = "wm8523",
 512                 .owner = THIS_MODULE,
 513                 .of_match_table = wm8523_of_match,
 514         },
 515         .probe =    wm8523_i2c_probe,
 516         .remove =   wm8523_i2c_remove,
 517         .id_table = wm8523_i2c_id,
 518 };
 519 #endif
 520
 521 static int __init wm8523_modinit(void)
 522 {
 523         int ret;
 524 #if IS_ENABLED(CONFIG_I2C)
 525         ret = i2c_add_driver(&wm8523_i2c_driver);
 526         if (ret != 0) {
 527                 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
 528                        ret);
 529         }
 530 #endif
 531         return 0;
 532 }
 533 module_init(wm8523_modinit);
 534
 535 static void __exit wm8523_exit(void)
 536 {
 537 #if IS_ENABLED(CONFIG_I2C)
 538         i2c_del_driver(&wm8523_i2c_driver);
 539 #endif
 540 }
 541 module_exit(wm8523_exit);
 542
 543 MODULE_DESCRIPTION("ASoC WM8523 driver");
 544 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 545 MODULE_LICENSE("GPL");