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/initval.h>
  28 #include <sound/tlv.h>
  29
  30 #include "wm8741.h"
  31
  32 #define WM8741_NUM_SUPPLIES 2
  33 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
  34         "AVDD",
  35         "DVDD",
  36 };
  37
  38 #define WM8741_NUM_RATES 6
  39
  40 /* codec private data */
  41 struct wm8741_priv {
  42         enum snd_soc_control_type control_type;
  43         struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
  44         unsigned int sysclk;
  45         struct snd_pcm_hw_constraint_list *sysclk_constraints;
  46 };
  47
  48 static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {
  49         0x0000,     /* R0  - DACLLSB Attenuation */
  50         0x0000,     /* R1  - DACLMSB Attenuation */
  51         0x0000,     /* R2  - DACRLSB Attenuation */
  52         0x0000,     /* R3  - DACRMSB Attenuation */
  53         0x0000,     /* R4  - Volume Control */
  54         0x000A,     /* R5  - Format Control */
  55         0x0000,     /* R6  - Filter Control */
  56         0x0000,     /* R7  - Mode Control 1 */
  57         0x0002,     /* R8  - Mode Control 2 */
  58         0x0000,     /* R9  - Reset */
  59         0x0002,     /* R32 - ADDITONAL_CONTROL_1 */
  60 };
  61
  62
  63 static int wm8741_reset(struct snd_soc_codec *codec)
  64 {
  65         return snd_soc_write(codec, WM8741_RESET, 0);
  66 }
  67
  68 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
  69 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);
  70
  71 static const struct snd_kcontrol_new wm8741_snd_controls[] = {
  72 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
  73                  WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
  74 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
  75                  WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
  76 };
  77
  78 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
  79 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
  80 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
  81 SND_SOC_DAPM_OUTPUT("VOUTLP"),
  82 SND_SOC_DAPM_OUTPUT("VOUTLN"),
  83 SND_SOC_DAPM_OUTPUT("VOUTRP"),
  84 SND_SOC_DAPM_OUTPUT("VOUTRN"),
  85 };
  86
  87 static const struct snd_soc_dapm_route intercon[] = {
  88         { "VOUTLP", NULL, "DACL" },
  89         { "VOUTLN", NULL, "DACL" },
  90         { "VOUTRP", NULL, "DACR" },
  91         { "VOUTRN", NULL, "DACR" },
  92 };
  93
  94 static int wm8741_add_widgets(struct snd_soc_codec *codec)
  95 {
  96         struct snd_soc_dapm_context *dapm = &codec->dapm;
  97
  98         snd_soc_dapm_new_controls(dapm, wm8741_dapm_widgets,
  99                                   ARRAY_SIZE(wm8741_dapm_widgets));
 100         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 101
 102         return 0;
 103 }
 104
 105 static struct {
 106         int value;
 107         int ratio;
 108 } lrclk_ratios[WM8741_NUM_RATES] = {
 109         { 1, 128 },
 110         { 2, 192 },
 111         { 3, 256 },
 112         { 4, 384 },
 113         { 5, 512 },
 114         { 6, 768 },
 115 };
 116
 117 static unsigned int rates_11289[] = {
 118         44100, 88235,
 119 };
 120
 121 static struct snd_pcm_hw_constraint_list constraints_11289 = {
 122         .count  = ARRAY_SIZE(rates_11289),
 123         .list   = rates_11289,
 124 };
 125
 126 static unsigned int rates_12288[] = {
 127         32000, 48000, 96000,
 128 };
 129
 130 static struct snd_pcm_hw_constraint_list constraints_12288 = {
 131         .count  = ARRAY_SIZE(rates_12288),
 132         .list   = rates_12288,
 133 };
 134
 135 static unsigned int rates_16384[] = {
 136         32000,
 137 };
 138
 139 static struct snd_pcm_hw_constraint_list constraints_16384 = {
 140         .count  = ARRAY_SIZE(rates_16384),
 141         .list   = rates_16384,
 142 };
 143
 144 static unsigned int rates_16934[] = {
 145         44100, 88235,
 146 };
 147
 148 static struct snd_pcm_hw_constraint_list constraints_16934 = {
 149         .count  = ARRAY_SIZE(rates_16934),
 150         .list   = rates_16934,
 151 };
 152
 153 static unsigned int rates_18432[] = {
 154         48000, 96000,
 155 };
 156
 157 static struct snd_pcm_hw_constraint_list constraints_18432 = {
 158         .count  = ARRAY_SIZE(rates_18432),
 159         .list   = rates_18432,
 160 };
 161
 162 static unsigned int rates_22579[] = {
 163         44100, 88235, 1764000
 164 };
 165
 166 static struct snd_pcm_hw_constraint_list constraints_22579 = {
 167         .count  = ARRAY_SIZE(rates_22579),
 168         .list   = rates_22579,
 169 };
 170
 171 static unsigned int rates_24576[] = {
 172         32000, 48000, 96000, 192000
 173 };
 174
 175 static struct snd_pcm_hw_constraint_list constraints_24576 = {
 176         .count  = ARRAY_SIZE(rates_24576),
 177         .list   = rates_24576,
 178 };
 179
 180 static unsigned int rates_36864[] = {
 181         48000, 96000, 19200
 182 };
 183
 184 static struct snd_pcm_hw_constraint_list constraints_36864 = {
 185         .count  = ARRAY_SIZE(rates_36864),
 186         .list   = rates_36864,
 187 };
 188
 189
 190 static int wm8741_startup(struct snd_pcm_substream *substream,
 191                           struct snd_soc_dai *dai)
 192 {
 193         struct snd_soc_codec *codec = dai->codec;
 194         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 195
 196         /* The set of sample rates that can be supported depends on the
 197          * MCLK supplied to the CODEC - enforce this.
 198          */
 199         if (!wm8741->sysclk) {
 200                 dev_err(codec->dev,
 201                         "No MCLK configured, call set_sysclk() on init\n");
 202                 return -EINVAL;
 203         }
 204
 205         snd_pcm_hw_constraint_list(substream->runtime, 0,
 206                                    SNDRV_PCM_HW_PARAM_RATE,
 207                                    wm8741->sysclk_constraints);
 208
 209         return 0;
 210 }
 211
 212 static int wm8741_hw_params(struct snd_pcm_substream *substream,
 213                             struct snd_pcm_hw_params *params,
 214                             struct snd_soc_dai *dai)
 215 {
 216         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 217         struct snd_soc_codec *codec = rtd->codec;
 218         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 219         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
 220         int i;
 221
 222         /* Find a supported LRCLK ratio */
 223         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 224                 if (wm8741->sysclk / params_rate(params) ==
 225                     lrclk_ratios[i].ratio)
 226                         break;
 227         }
 228
 229         /* Should never happen, should be handled by constraints */
 230         if (i == ARRAY_SIZE(lrclk_ratios)) {
 231                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 232                         wm8741->sysclk / params_rate(params));
 233                 return -EINVAL;
 234         }
 235
 236         /* bit size */
 237         switch (params_format(params)) {
 238         case SNDRV_PCM_FORMAT_S16_LE:
 239                 break;
 240         case SNDRV_PCM_FORMAT_S20_3LE:
 241                 iface |= 0x0001;
 242                 break;
 243         case SNDRV_PCM_FORMAT_S24_LE:
 244                 iface |= 0x0002;
 245                 break;
 246         case SNDRV_PCM_FORMAT_S32_LE:
 247                 iface |= 0x0003;
 248                 break;
 249         default:
 250                 dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
 251                         params_format(params));
 252                 return -EINVAL;
 253         }
 254
 255         dev_dbg(codec->dev, "wm8741_hw_params:    bit size param = %d",
 256                 params_format(params));
 257
 258         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 259         return 0;
 260 }
 261
 262 static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 263                 int clk_id, unsigned int freq, int dir)
 264 {
 265         struct snd_soc_codec *codec = codec_dai->codec;
 266         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 267
 268         dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
 269
 270         switch (freq) {
 271         case 11289600:
 272                 wm8741->sysclk_constraints = &constraints_11289;
 273                 wm8741->sysclk = freq;
 274                 return 0;
 275
 276         case 12288000:
 277                 wm8741->sysclk_constraints = &constraints_12288;
 278                 wm8741->sysclk = freq;
 279                 return 0;
 280
 281         case 16384000:
 282                 wm8741->sysclk_constraints = &constraints_16384;
 283                 wm8741->sysclk = freq;
 284                 return 0;
 285
 286         case 16934400:
 287                 wm8741->sysclk_constraints = &constraints_16934;
 288                 wm8741->sysclk = freq;
 289                 return 0;
 290
 291         case 18432000:
 292                 wm8741->sysclk_constraints = &constraints_18432;
 293                 wm8741->sysclk = freq;
 294                 return 0;
 295
 296         case 22579200:
 297         case 33868800:
 298                 wm8741->sysclk_constraints = &constraints_22579;
 299                 wm8741->sysclk = freq;
 300                 return 0;
 301
 302         case 24576000:
 303                 wm8741->sysclk_constraints = &constraints_24576;
 304                 wm8741->sysclk = freq;
 305                 return 0;
 306
 307         case 36864000:
 308                 wm8741->sysclk_constraints = &constraints_36864;
 309                 wm8741->sysclk = freq;
 310                 return 0;
 311         }
 312         return -EINVAL;
 313 }
 314
 315 static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,
 316                 unsigned int fmt)
 317 {
 318         struct snd_soc_codec *codec = codec_dai->codec;
 319         u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3;
 320
 321         /* check master/slave audio interface */
 322         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 323         case SND_SOC_DAIFMT_CBS_CFS:
 324                 break;
 325         default:
 326                 return -EINVAL;
 327         }
 328
 329         /* interface format */
 330         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 331         case SND_SOC_DAIFMT_I2S:
 332                 iface |= 0x0008;
 333                 break;
 334         case SND_SOC_DAIFMT_RIGHT_J:
 335                 break;
 336         case SND_SOC_DAIFMT_LEFT_J:
 337                 iface |= 0x0004;
 338                 break;
 339         case SND_SOC_DAIFMT_DSP_A:
 340                 iface |= 0x0003;
 341                 break;
 342         case SND_SOC_DAIFMT_DSP_B:
 343                 iface |= 0x0013;
 344                 break;
 345         default:
 346                 return -EINVAL;
 347         }
 348
 349         /* clock inversion */
 350         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 351         case SND_SOC_DAIFMT_NB_NF:
 352                 break;
 353         case SND_SOC_DAIFMT_IB_IF:
 354                 iface |= 0x0010;
 355                 break;
 356         case SND_SOC_DAIFMT_IB_NF:
 357                 iface |= 0x0020;
 358                 break;
 359         case SND_SOC_DAIFMT_NB_IF:
 360                 iface |= 0x0030;
 361                 break;
 362         default:
 363                 return -EINVAL;
 364         }
 365
 366
 367         dev_dbg(codec->dev, "wm8741_set_dai_fmt:    Format=%x, Clock Inv=%x\n",
 368                                 fmt & SND_SOC_DAIFMT_FORMAT_MASK,
 369                                 ((fmt & SND_SOC_DAIFMT_INV_MASK)));
 370
 371         snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
 372         return 0;
 373 }
 374
 375 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 376                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
 377                         SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
 378                         SNDRV_PCM_RATE_192000)
 379
 380 #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 381                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 382
 383 static struct snd_soc_dai_ops wm8741_dai_ops = {
 384         .startup        = wm8741_startup,
 385         .hw_params      = wm8741_hw_params,
 386         .set_sysclk     = wm8741_set_dai_sysclk,
 387         .set_fmt        = wm8741_set_dai_fmt,
 388 };
 389
 390 static struct snd_soc_dai_driver wm8741_dai = {
 391         .name = "wm8741",
 392         .playback = {
 393                 .stream_name = "Playback",
 394                 .channels_min = 2,  /* Mono modes not yet supported */
 395                 .channels_max = 2,
 396                 .rates = WM8741_RATES,
 397                 .formats = WM8741_FORMATS,
 398         },
 399         .ops = &wm8741_dai_ops,
 400 };
 401
 402 #ifdef CONFIG_PM
 403 static int wm8741_resume(struct snd_soc_codec *codec)
 404 {
 405         u16 *cache = codec->reg_cache;
 406         int i;
 407
 408         /* RESTORE REG Cache */
 409         for (i = 0; i < WM8741_REGISTER_COUNT; i++) {
 410                 if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i)
 411                         continue;
 412                 snd_soc_write(codec, i, cache[i]);
 413         }
 414         return 0;
 415 }
 416 #else
 417 #define wm8741_suspend NULL
 418 #define wm8741_resume NULL
 419 #endif
 420
 421 static int wm8741_probe(struct snd_soc_codec *codec)
 422 {
 423         struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
 424         u16 *reg_cache = codec->reg_cache;
 425         int ret = 0;
 426
 427         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8741->control_type);
 428         if (ret != 0) {
 429                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 430                 return ret;
 431         }
 432
 433         ret = wm8741_reset(codec);
 434         if (ret < 0) {
 435                 dev_err(codec->dev, "Failed to issue reset\n");
 436                 return ret;
 437         }
 438
 439         /* Change some default settings - latch VU */
 440         reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL;
 441         reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM;
 442         reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL;
 443         reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM;
 444
 445         snd_soc_add_controls(codec, wm8741_snd_controls,
 446                              ARRAY_SIZE(wm8741_snd_controls));
 447         wm8741_add_widgets(codec);
 448
 449         dev_dbg(codec->dev, "Successful registration\n");
 450         return ret;
 451 }
 452
 453 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
 454         .probe =        wm8741_probe,
 455         .resume =       wm8741_resume,
 456         .reg_cache_size = ARRAY_SIZE(wm8741_reg_defaults),
 457         .reg_word_size = sizeof(u16),
 458         .reg_cache_default = wm8741_reg_defaults,
 459 };
 460
 461 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 462 static int wm8741_i2c_probe(struct i2c_client *i2c,
 463                             const struct i2c_device_id *id)
 464 {
 465         struct wm8741_priv *wm8741;
 466         int ret, i;
 467
 468         wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);
 469         if (wm8741 == NULL)
 470                 return -ENOMEM;
 471
 472         for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
 473                 wm8741->supplies[i].supply = wm8741_supply_names[i];
 474
 475         ret = regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
 476                                  wm8741->supplies);
 477         if (ret != 0) {
 478                 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
 479                 goto err;
 480         }
 481
 482         ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
 483                                     wm8741->supplies);
 484         if (ret != 0) {
 485                 dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
 486                 goto err_get;
 487         }
 488
 489         i2c_set_clientdata(i2c, wm8741);
 490         wm8741->control_type = SND_SOC_I2C;
 491
 492         ret =  snd_soc_register_codec(&i2c->dev,
 493                         &soc_codec_dev_wm8741, &wm8741_dai, 1);
 494         if (ret < 0)
 495                 goto err_enable;
 496         return ret;
 497
 498 err_enable:
 499         regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 500
 501 err_get:
 502         regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 503 err:
 504         kfree(wm8741);
 505         return ret;
 506 }
 507
 508 static int wm8741_i2c_remove(struct i2c_client *client)
 509 {
 510         struct wm8741_priv *wm8741 = i2c_get_clientdata(client);
 511
 512         snd_soc_unregister_codec(&client->dev);
 513         regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
 514         kfree(i2c_get_clientdata(client));
 515         return 0;
 516 }
 517
 518 static const struct i2c_device_id wm8741_i2c_id[] = {
 519         { "wm8741", 0 },
 520         { }
 521 };
 522 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);
 523
 524 static struct i2c_driver wm8741_i2c_driver = {
 525         .driver = {
 526                 .name = "wm8741-codec",
 527                 .owner = THIS_MODULE,
 528         },
 529         .probe =    wm8741_i2c_probe,
 530         .remove =   wm8741_i2c_remove,
 531         .id_table = wm8741_i2c_id,
 532 };
 533 #endif
 534
 535 static int __init wm8741_modinit(void)
 536 {
 537         int ret = 0;
 538
 539 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 540         ret = i2c_add_driver(&wm8741_i2c_driver);
 541         if (ret != 0)
 542                 pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
 543 #endif
 544
 545         return ret;
 546 }
 547 module_init(wm8741_modinit);
 548
 549 static void __exit wm8741_exit(void)
 550 {
 551 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 552         i2c_del_driver(&wm8741_i2c_driver);
 553 #endif
 554 }
 555 module_exit(wm8741_exit);
 556
 557 MODULE_DESCRIPTION("ASoC WM8741 driver");
 558 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
 559 MODULE_LICENSE("GPL");