sound/soc/codecs/wm8741.c

   1 /*
   2  * wm8741.c  --  WM8741 ALSA SoC Audio driver
   3  *
   4  * Copyright 2010 Wolfson Microelectronics plc
   5  *
   6  * Author: Ian Lartey <ian@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/soc-dapm.h>
  28 #include <sound/initval.h>
  29 #include <sound/tlv.h>
  30
  31 #include "wm8741.h"
  32
  33 #define WM8741_NUM_SUPPLIES 2
  34 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
  35         "AVDD",
  36         "DVDD",
  37 };
  38
  39 #define WM8741_NUM_RATES 4
  40
  41 /* codec private data */
  42 struct wm8741_priv {
  43         enum snd_soc_control_type control_type;
  44         void *control_data;
  45         u16 reg_cache[WM8741_REGISTER_COUNT];
  46         struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
  47         unsigned int sysclk;
  48         unsigned int rate_constraint_list[WM8741_NUM_RATES];
  49         struct snd_pcm_hw_constraint_list rate_constraint;
  50 };
  51
  52 static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {
  53         0x0000,     /* R0  - DACLLSB Attenuation */
  54         0x0000,     /* R1  - DACLMSB Attenuation */
  55         0x0000,     /* R2  - DACRLSB Attenuation */
  56         0x0000,     /* R3  - DACRMSB Attenuation */
  57         0x0000,     /* R4  - Volume Control */
  58         0x000A,     /* R5  - Format Control */
  59         0x0000,     /* R6  - Filter Control */
  60         0x0000,     /* R7  - Mode Control 1 */
  61         0x0002,     /* R8  - Mode Control 2 */
  62         0x0000,     /* R9  - Reset */
  63         0x0002,     /* R32 - ADDITONAL_CONTROL_1 */
  64 };
  65
  66
  67 static int wm8741_reset(struct snd_soc_codec *codec)
  68 {
  69         return snd_soc_write(codec, WM8741_RESET, 0);
  70 }
  71
  72 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
  73 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);
  74
  75 static const struct snd_kcontrol_new wm8741_snd_controls[] = {
  76 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
  77                  WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
  78 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
  79                  WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
  80 };
  81
  82 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
  83 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
  84 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
  85 SND_SOC_DAPM_OUTPUT("VOUTLP"),
  86 SND_SOC_DAPM_OUTPUT("VOUTLN"),
  87 SND_SOC_DAPM_OUTPUT("VOUTRP"),
  88 SND_SOC_DAPM_OUTPUT("VOUTRN"),
  89 };
  90
  91 static const struct snd_soc_dapm_route intercon[] = {
  92         { "VOUTLP", NULL, "DACL" },
  93         { "VOUTLN", NULL, "DACL" },
  94         { "VOUTRP", NULL, "DACR" },
  95         { "VOUTRN", NULL, "DACR" },
  96 };
  97
  98 static int wm8741_add_widgets(struct snd_soc_codec *codec)
  99 {
 100         snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets,
 101                                   ARRAY_SIZE(wm8741_dapm_widgets));
 102
 103         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 104
 105         return 0;
 106 }
 107
 108 static struct {
 109         int value;
 110         int ratio;
 111 } lrclk_ratios[WM8741_NUM_RATES] = {
 112         { 1, 256 },
 113         { 2, 384 },
 114         { 3, 512 },
 115         { 4, 768 },
 116 };
 117
 118
 119 static int wm8741_startup(struct snd_pcm_substream *substream,
 120                           struct snd_soc_dai *dai)
 121 {
 122         struct snd_soc_codec *codec = dai->codec;
 123         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 124
 125         /* The set of sample rates that can be supported depends on the
 126          * MCLK supplied to the CODEC - enforce this.
 127          */
 128         if (!wm8741->sysclk) {
 129                 dev_err(codec->dev,
 130                         "No MCLK configured, call set_sysclk() on init\n");
 131                 return -EINVAL;
 132         }
 133
 134         snd_pcm_hw_constraint_list(substream->runtime, 0,
 135                                    SNDRV_PCM_HW_PARAM_RATE,
 136                                    &wm8741->rate_constraint);
 137
 138         return 0;
 139 }
 140
 141 static int wm8741_hw_params(struct snd_pcm_substream *substream,
 142                             struct snd_pcm_hw_params *params,
 143                             struct snd_soc_dai *dai)
 144 {
 145         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 146         struct snd_soc_codec *codec = rtd->codec;
 147         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 148         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
 149         int i;
 150
 151         /* Find a supported LRCLK ratio */
 152         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 153                 if (wm8741->sysclk / params_rate(params) ==
 154                     lrclk_ratios[i].ratio)
 155                         break;
 156         }
 157
 158         /* Should never happen, should be handled by constraints */
 159         if (i == ARRAY_SIZE(lrclk_ratios)) {
 160                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 161                         wm8741->sysclk / params_rate(params));
 162                 return -EINVAL;
 163         }
 164
 165         /* bit size */
 166         switch (params_format(params)) {
 167         case SNDRV_PCM_FORMAT_S16_LE:
 168                 break;
 169         case SNDRV_PCM_FORMAT_S20_3LE:
 170                 iface |= 0x0001;
 171                 break;
 172         case SNDRV_PCM_FORMAT_S24_LE:
 173                 iface |= 0x0002;
 174                 break;
 175         case SNDRV_PCM_FORMAT_S32_LE:
 176                 iface |= 0x0003;
 177                 break;
 178         default:
 179                 dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 180                         params_format(params));
 181                 return -EINVAL;
 182         }
 183
 184         dev_dbg(codec->dev, "wm8741_hw_params:    bit size param = %d",
 185                 params_format(params));
 186
 187         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 188         return 0;
 189 }
 190
 191 static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 192                 int clk_id, unsigned int freq, int dir)
 193 {
 194         struct snd_soc_codec *codec = codec_dai->codec;
 195         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 196         unsigned int val;
 197         int i;
 198
 199         dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
 200
 201         wm8741->sysclk = freq;
 202
 203         wm8741->rate_constraint.count = 0;
 204
 205         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 206                 dev_dbg(codec->dev, "index = %d, ratio = %d, freq = %d",
 207                                 i, lrclk_ratios[i].ratio, freq);
 208
 209                 val = freq / lrclk_ratios[i].ratio;
 210                 /* Check that it's a standard rate since core can't
 211                  * cope with others and having the odd rates confuses
 212                  * constraint matching.
 213                  */
 214                 switch (val) {
 215                 case 32000:
 216                 case 44100:
 217                 case 48000:
 218                 case 64000:
 219                 case 88200:
 220                 case 96000:
 221                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 222                                 val);
 223                         wm8741->rate_constraint_list[i] = val;
 224                         wm8741->rate_constraint.count++;
 225                         break;
 226                 default:
 227                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 228                                 val);
 229                 }
 230         }
 231
 232         /* Need at least one supported rate... */
 233         if (wm8741->rate_constraint.count == 0)
 234                 return -EINVAL;
 235
 236         return 0;
 237 }
 238
 239 static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,
 240                 unsigned int fmt)
 241 {
 242         struct snd_soc_codec *codec = codec_dai->codec;
 243         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3;
 244
 245         /* check master/slave audio interface */
 246         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 247         case SND_SOC_DAIFMT_CBS_CFS:
 248                 break;
 249         default:
 250                 return -EINVAL;
 251         }
 252
 253         /* interface format */
 254         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 255         case SND_SOC_DAIFMT_I2S:
 256                 iface |= 0x0008;
 257                 break;
 258         case SND_SOC_DAIFMT_RIGHT_J:
 259                 break;
 260         case SND_SOC_DAIFMT_LEFT_J:
 261                 iface |= 0x0004;
 262                 break;
 263         case SND_SOC_DAIFMT_DSP_A:
 264                 iface |= 0x0003;
 265                 break;
 266         case SND_SOC_DAIFMT_DSP_B:
 267                 iface |= 0x0013;
 268                 break;
 269         default:
 270                 return -EINVAL;
 271         }
 272
 273         /* clock inversion */
 274         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 275         case SND_SOC_DAIFMT_NB_NF:
 276                 break;
 277         case SND_SOC_DAIFMT_IB_IF:
 278                 iface |= 0x0010;
 279                 break;
 280         case SND_SOC_DAIFMT_IB_NF:
 281                 iface |= 0x0020;
 282                 break;
 283         case SND_SOC_DAIFMT_NB_IF:
 284                 iface |= 0x0030;
 285                 break;
 286         default:
 287                 return -EINVAL;
 288         }
 289
 290
 291         dev_dbg(codec->dev, "wm8741_set_dai_fmt:    Format=%x, Clock Inv=%x\n",
 292                                 fmt & SND_SOC_DAIFMT_FORMAT_MASK,
 293                                 ((fmt & SND_SOC_DAIFMT_INV_MASK)));
 294
 295         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 296         return 0;
 297 }
 298
 299 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 300                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
 301                         SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
 302                         SNDRV_PCM_RATE_192000)
 303
 304 #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 305                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 306
 307 static struct snd_soc_dai_ops wm8741_dai_ops = {
 308         .startup        = wm8741_startup,
 309         .hw_params      = wm8741_hw_params,
 310         .set_sysclk     = wm8741_set_dai_sysclk,
 311         .set_fmt        = wm8741_set_dai_fmt,
 312 };
 313
 314 static struct snd_soc_dai_driver wm8741_dai = {
 315         .name = "WM8741",
 316         .playback = {
 317                 .stream_name = "Playback",
 318                 .channels_min = 2,  /* Mono modes not yet supported */
 319                 .channels_max = 2,
 320                 .rates = WM8741_RATES,
 321                 .formats = WM8741_FORMATS,
 322         },
 323         .ops = &wm8741_dai_ops,
 324 };
 325
 326 #ifdef CONFIG_PM
 327 static int wm8741_resume(struct snd_soc_codec *codec)
 328 {
 329         u16 *cache = codec->reg_cache;
 330         int i;
 331
 332         /* RESTORE REG Cache */
 333         for (i = 0; i < WM8741_REGISTER_COUNT; i++) {
 334                 if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i)
 335                         continue;
 336                 snd_soc_write(codec, i, cache[i]);
 337         }
 338         return 0;
 339 }
 340 #else
 341 #define wm8741_suspend NULL
 342 #define wm8741_resume NULL
 343 #endif
 344
 345 static int wm8741_probe(struct snd_soc_codec *codec)
 346 {
 347         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 348         int ret = 0;
 349
 350         codec->control_data = wm8741->control_data;
 351         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8741->control_type);
 352         if (ret != 0) {
 353                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 354                 return ret;
 355         }
 356
 357         ret = wm8741_reset(codec);
 358         if (ret < 0) {
 359                 dev_err(codec->dev, "Failed to issue reset\n");
 360                 return ret;
 361         }
 362
 363         /* Change some default settings - latch VU */
 364         wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL;
 365         wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM;
 366         wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL;
 367         wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM;
 368
 369         snd_soc_add_controls(codec, wm8741_snd_controls,
 370                              ARRAY_SIZE(wm8741_snd_controls));
 371         wm8741_add_widgets(codec);
 372
 373         dev_dbg(codec->dev, "Successful registration\n");
 374         return ret;
 375 }
 376
 377 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
 378         .probe =        wm8741_probe,
 379         .resume =       wm8741_resume,
 380         .reg_cache_size = sizeof(wm8741_reg_defaults),
 381         .reg_word_size = sizeof(u16),
 382         .reg_cache_default = &wm8741_reg_defaults,
 383 };
 384
 385 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 386 static int wm8741_i2c_probe(struct i2c_client *i2c,
 387                             const struct i2c_device_id *id)
 388 {
 389         struct wm8741_priv *wm8741;
 390         int ret, i;
 391
 392         wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);
 393         if (wm8741 == NULL)
 394                 return -ENOMEM;
 395
 396         wm8741->rate_constraint.list = &wm8741->rate_constraint_list[0];
 397         wm8741->rate_constraint.count =
 398                 ARRAY_SIZE(wm8741->rate_constraint_list);
 399
 400         for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
 401                 wm8741->supplies[i].supply = wm8741_supply_names[i];
 402
 403         ret = regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
 404                                  wm8741->supplies);
 405         if (ret != 0) {
 406                 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
 407                 goto err;
 408         }
 409
 410         ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
 411                                     wm8741->supplies);
 412         if (ret != 0) {
 413                 dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
 414                 goto err_get;
 415         }
 416
 417         i2c_set_clientdata(i2c, wm8741);
 418         wm8741->control_data = i2c;
 419         wm8741->control_type = SND_SOC_I2C;
 420
 421         ret =  snd_soc_register_codec(&i2c->dev,
 422                         &soc_codec_dev_wm8741, &wm8741_dai, 1);
 423         if (ret < 0)
 424                 goto err_enable;
 425         return ret;
 426
 427 err_enable:
 428         regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 429
 430 err_get:
 431         regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 432 err:
 433         kfree(wm8741);
 434         return ret;
 435 }
 436
 437 static int wm8741_i2c_remove(struct i2c_client *client)
 438 {
 439         struct wm8741_priv *wm8741 = i2c_get_clientdata(client);
 440
 441         snd_soc_unregister_codec(&client->dev);
 442         regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 443         kfree(i2c_get_clientdata(client));
 444         return 0;
 445 }
 446
 447 static const struct i2c_device_id wm8741_i2c_id[] = {
 448         { "wm8741", 0 },
 449         { }
 450 };
 451 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);
 452
 453 static struct i2c_driver wm8741_i2c_driver = {
 454         .driver = {
 455                 .name = "wm8741-codec",
 456                 .owner = THIS_MODULE,
 457         },
 458         .probe =    wm8741_i2c_probe,
 459         .remove =   wm8741_i2c_remove,
 460         .id_table = wm8741_i2c_id,
 461 };
 462 #endif
 463
 464 static int __init wm8741_modinit(void)
 465 {
 466         int ret = 0;
 467
 468 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 469         ret = i2c_add_driver(&wm8741_i2c_driver);
 470         if (ret != 0) {
 471                 pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
 472         }
 473 #endif
 474
 475         return ret;
 476 }
 477 module_init(wm8741_modinit);
 478
 479 static void __exit wm8741_exit(void)
 480 {
 481 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 482         i2c_del_driver(&wm8741_i2c_driver);
 483 #endif
 484 }
 485 module_exit(wm8741_exit);
 486
 487 MODULE_DESCRIPTION("ASoC WM8741 driver");
 488 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
 489 MODULE_LICENSE("GPL");