sound/soc/codecs/wm8728.c

   1 /*
   2  * wm8728.c  --  WM8728 ALSA SoC Audio driver
   3  *
   4  * Copyright 2008 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/pm.h>
  18 #include <linux/i2c.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/spi/spi.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/soc-dapm.h>
  26 #include <sound/initval.h>
  27 #include <sound/tlv.h>
  28
  29 #include "wm8728.h"
  30
  31 struct snd_soc_codec_device soc_codec_dev_wm8728;
  32
  33 /*
  34  * We can't read the WM8728 register space so we cache them instead.
  35  * Note that the defaults here aren't the physical defaults, we latch
  36  * the volume update bits, mute the output and enable infinite zero
  37  * detect.
  38  */
  39 static const u16 wm8728_reg_defaults[] = {
  40         0x1ff,
  41         0x1ff,
  42         0x001,
  43         0x100,
  44 };
  45
  46 static inline unsigned int wm8728_read_reg_cache(struct snd_soc_codec *codec,
  47         unsigned int reg)
  48 {
  49         u16 *cache = codec->reg_cache;
  50         BUG_ON(reg >= ARRAY_SIZE(wm8728_reg_defaults));
  51         return cache[reg];
  52 }
  53
  54 static inline void wm8728_write_reg_cache(struct snd_soc_codec *codec,
  55         u16 reg, unsigned int value)
  56 {
  57         u16 *cache = codec->reg_cache;
  58         BUG_ON(reg >= ARRAY_SIZE(wm8728_reg_defaults));
  59         cache[reg] = value;
  60 }
  61
  62 /*
  63  * write to the WM8728 register space
  64  */
  65 static int wm8728_write(struct snd_soc_codec *codec, unsigned int reg,
  66         unsigned int value)
  67 {
  68         u8 data[2];
  69
  70         /* data is
  71          *   D15..D9 WM8728 register offset
  72          *   D8...D0 register data
  73          */
  74         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
  75         data[1] = value & 0x00ff;
  76
  77         wm8728_write_reg_cache(codec, reg, value);
  78
  79         if (codec->hw_write(codec->control_data, data, 2) == 2)
  80                 return 0;
  81         else
  82                 return -EIO;
  83 }
  84
  85 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
  86
  87 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
  88
  89 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
  90                  0, 255, 0, wm8728_tlv),
  91
  92 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
  93 };
  94
  95 /*
  96  * DAPM controls.
  97  */
  98 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
  99 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
 100 SND_SOC_DAPM_OUTPUT("VOUTL"),
 101 SND_SOC_DAPM_OUTPUT("VOUTR"),
 102 };
 103
 104 static const struct snd_soc_dapm_route intercon[] = {
 105         {"VOUTL", NULL, "DAC"},
 106         {"VOUTR", NULL, "DAC"},
 107 };
 108
 109 static int wm8728_add_widgets(struct snd_soc_codec *codec)
 110 {
 111         snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
 112                                   ARRAY_SIZE(wm8728_dapm_widgets));
 113
 114         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 115
 116         snd_soc_dapm_new_widgets(codec);
 117
 118         return 0;
 119 }
 120
 121 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
 122 {
 123         struct snd_soc_codec *codec = dai->codec;
 124         u16 mute_reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
 125
 126         if (mute)
 127                 wm8728_write(codec, WM8728_DACCTL, mute_reg | 1);
 128         else
 129                 wm8728_write(codec, WM8728_DACCTL, mute_reg & ~1);
 130
 131         return 0;
 132 }
 133
 134 static int wm8728_hw_params(struct snd_pcm_substream *substream,
 135         struct snd_pcm_hw_params *params,
 136         struct snd_soc_dai *dai)
 137 {
 138         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 139         struct snd_soc_device *socdev = rtd->socdev;
 140         struct snd_soc_codec *codec = socdev->card->codec;
 141         u16 dac = wm8728_read_reg_cache(codec, WM8728_DACCTL);
 142
 143         dac &= ~0x18;
 144
 145         switch (params_format(params)) {
 146         case SNDRV_PCM_FORMAT_S16_LE:
 147                 break;
 148         case SNDRV_PCM_FORMAT_S20_3LE:
 149                 dac |= 0x10;
 150                 break;
 151         case SNDRV_PCM_FORMAT_S24_LE:
 152                 dac |= 0x08;
 153                 break;
 154         default:
 155                 return -EINVAL;
 156         }
 157
 158         wm8728_write(codec, WM8728_DACCTL, dac);
 159
 160         return 0;
 161 }
 162
 163 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 164                 unsigned int fmt)
 165 {
 166         struct snd_soc_codec *codec = codec_dai->codec;
 167         u16 iface = wm8728_read_reg_cache(codec, WM8728_IFCTL);
 168
 169         /* Currently only I2S is supported by the driver, though the
 170          * hardware is more flexible.
 171          */
 172         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 173         case SND_SOC_DAIFMT_I2S:
 174                 iface |= 1;
 175                 break;
 176         default:
 177                 return -EINVAL;
 178         }
 179
 180         /* The hardware only support full slave mode */
 181         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 182         case SND_SOC_DAIFMT_CBS_CFS:
 183                 break;
 184         default:
 185                 return -EINVAL;
 186         }
 187
 188         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 189         case SND_SOC_DAIFMT_NB_NF:
 190                 iface &= ~0x22;
 191                 break;
 192         case SND_SOC_DAIFMT_IB_NF:
 193                 iface |=  0x20;
 194                 iface &= ~0x02;
 195                 break;
 196         case SND_SOC_DAIFMT_NB_IF:
 197                 iface |= 0x02;
 198                 iface &= ~0x20;
 199                 break;
 200         case SND_SOC_DAIFMT_IB_IF:
 201                 iface |= 0x22;
 202                 break;
 203         default:
 204                 return -EINVAL;
 205         }
 206
 207         wm8728_write(codec, WM8728_IFCTL, iface);
 208         return 0;
 209 }
 210
 211 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 212                                  enum snd_soc_bias_level level)
 213 {
 214         u16 reg;
 215         int i;
 216
 217         switch (level) {
 218         case SND_SOC_BIAS_ON:
 219         case SND_SOC_BIAS_PREPARE:
 220         case SND_SOC_BIAS_STANDBY:
 221                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
 222                         /* Power everything up... */
 223                         reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
 224                         wm8728_write(codec, WM8728_DACCTL, reg & ~0x4);
 225
 226                         /* ..then sync in the register cache. */
 227                         for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 228                                 wm8728_write(codec, i,
 229                                              wm8728_read_reg_cache(codec, i));
 230                 }
 231                 break;
 232
 233         case SND_SOC_BIAS_OFF:
 234                 reg = wm8728_read_reg_cache(codec, WM8728_DACCTL);
 235                 wm8728_write(codec, WM8728_DACCTL, reg | 0x4);
 236                 break;
 237         }
 238         codec->bias_level = level;
 239         return 0;
 240 }
 241
 242 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 243
 244 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 245         SNDRV_PCM_FMTBIT_S24_LE)
 246
 247 static struct snd_soc_dai_ops wm8728_dai_ops = {
 248         .hw_params      = wm8728_hw_params,
 249         .digital_mute   = wm8728_mute,
 250         .set_fmt        = wm8728_set_dai_fmt,
 251 };
 252
 253 struct snd_soc_dai wm8728_dai = {
 254         .name = "WM8728",
 255         .playback = {
 256                 .stream_name = "Playback",
 257                 .channels_min = 2,
 258                 .channels_max = 2,
 259                 .rates = WM8728_RATES,
 260                 .formats = WM8728_FORMATS,
 261         },
 262         .ops = &wm8728_dai_ops,
 263 };
 264 EXPORT_SYMBOL_GPL(wm8728_dai);
 265
 266 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
 267 {
 268         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 269         struct snd_soc_codec *codec = socdev->card->codec;
 270
 271         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 272
 273         return 0;
 274 }
 275
 276 static int wm8728_resume(struct platform_device *pdev)
 277 {
 278         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 279         struct snd_soc_codec *codec = socdev->card->codec;
 280
 281         wm8728_set_bias_level(codec, codec->suspend_bias_level);
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * initialise the WM8728 driver
 288  * register the mixer and dsp interfaces with the kernel
 289  */
 290 static int wm8728_init(struct snd_soc_device *socdev)
 291 {
 292         struct snd_soc_codec *codec = socdev->card->codec;
 293         int ret = 0;
 294
 295         codec->name = "WM8728";
 296         codec->owner = THIS_MODULE;
 297         codec->read = wm8728_read_reg_cache;
 298         codec->write = wm8728_write;
 299         codec->set_bias_level = wm8728_set_bias_level;
 300         codec->dai = &wm8728_dai;
 301         codec->num_dai = 1;
 302         codec->bias_level = SND_SOC_BIAS_OFF;
 303         codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
 304         codec->reg_cache = kmemdup(wm8728_reg_defaults,
 305                                    sizeof(wm8728_reg_defaults),
 306                                    GFP_KERNEL);
 307         if (codec->reg_cache == NULL)
 308                 return -ENOMEM;
 309
 310         /* register pcms */
 311         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 312         if (ret < 0) {
 313                 printk(KERN_ERR "wm8728: failed to create pcms\n");
 314                 goto pcm_err;
 315         }
 316
 317         /* power on device */
 318         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 319
 320         snd_soc_add_controls(codec, wm8728_snd_controls,
 321                                 ARRAY_SIZE(wm8728_snd_controls));
 322         wm8728_add_widgets(codec);
 323         ret = snd_soc_init_card(socdev);
 324         if (ret < 0) {
 325                 printk(KERN_ERR "wm8728: failed to register card\n");
 326                 goto card_err;
 327         }
 328
 329         return ret;
 330
 331 card_err:
 332         snd_soc_free_pcms(socdev);
 333         snd_soc_dapm_free(socdev);
 334 pcm_err:
 335         kfree(codec->reg_cache);
 336         return ret;
 337 }
 338
 339 static struct snd_soc_device *wm8728_socdev;
 340
 341 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 342
 343 /*
 344  * WM8728 2 wire address is determined by GPIO5
 345  * state during powerup.
 346  *    low  = 0x1a
 347  *    high = 0x1b
 348  */
 349
 350 static int wm8728_i2c_probe(struct i2c_client *i2c,
 351                             const struct i2c_device_id *id)
 352 {
 353         struct snd_soc_device *socdev = wm8728_socdev;
 354         struct snd_soc_codec *codec = socdev->card->codec;
 355         int ret;
 356
 357         i2c_set_clientdata(i2c, codec);
 358         codec->control_data = i2c;
 359
 360         ret = wm8728_init(socdev);
 361         if (ret < 0)
 362                 pr_err("failed to initialise WM8728\n");
 363
 364         return ret;
 365 }
 366
 367 static int wm8728_i2c_remove(struct i2c_client *client)
 368 {
 369         struct snd_soc_codec *codec = i2c_get_clientdata(client);
 370         kfree(codec->reg_cache);
 371         return 0;
 372 }
 373
 374 static const struct i2c_device_id wm8728_i2c_id[] = {
 375         { "wm8728", 0 },
 376         { }
 377 };
 378 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 379
 380 static struct i2c_driver wm8728_i2c_driver = {
 381         .driver = {
 382                 .name = "WM8728 I2C Codec",
 383                 .owner = THIS_MODULE,
 384         },
 385         .probe =    wm8728_i2c_probe,
 386         .remove =   wm8728_i2c_remove,
 387         .id_table = wm8728_i2c_id,
 388 };
 389
 390 static int wm8728_add_i2c_device(struct platform_device *pdev,
 391                                  const struct wm8728_setup_data *setup)
 392 {
 393         struct i2c_board_info info;
 394         struct i2c_adapter *adapter;
 395         struct i2c_client *client;
 396         int ret;
 397
 398         ret = i2c_add_driver(&wm8728_i2c_driver);
 399         if (ret != 0) {
 400                 dev_err(&pdev->dev, "can't add i2c driver\n");
 401                 return ret;
 402         }
 403
 404         memset(&info, 0, sizeof(struct i2c_board_info));
 405         info.addr = setup->i2c_address;
 406         strlcpy(info.type, "wm8728", I2C_NAME_SIZE);
 407
 408         adapter = i2c_get_adapter(setup->i2c_bus);
 409         if (!adapter) {
 410                 dev_err(&pdev->dev, "can't get i2c adapter %d\n",
 411                         setup->i2c_bus);
 412                 goto err_driver;
 413         }
 414
 415         client = i2c_new_device(adapter, &info);
 416         i2c_put_adapter(adapter);
 417         if (!client) {
 418                 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
 419                         (unsigned int)info.addr);
 420                 goto err_driver;
 421         }
 422
 423         return 0;
 424
 425 err_driver:
 426         i2c_del_driver(&wm8728_i2c_driver);
 427         return -ENODEV;
 428 }
 429 #endif
 430
 431 #if defined(CONFIG_SPI_MASTER)
 432 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 433 {
 434         struct snd_soc_device *socdev = wm8728_socdev;
 435         struct snd_soc_codec *codec = socdev->card->codec;
 436         int ret;
 437
 438         codec->control_data = spi;
 439
 440         ret = wm8728_init(socdev);
 441         if (ret < 0)
 442                 dev_err(&spi->dev, "failed to initialise WM8728\n");
 443
 444         return ret;
 445 }
 446
 447 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 448 {
 449         return 0;
 450 }
 451
 452 static struct spi_driver wm8728_spi_driver = {
 453         .driver = {
 454                 .name   = "wm8728",
 455                 .bus    = &spi_bus_type,
 456                 .owner  = THIS_MODULE,
 457         },
 458         .probe          = wm8728_spi_probe,
 459         .remove         = __devexit_p(wm8728_spi_remove),
 460 };
 461
 462 static int wm8728_spi_write(struct spi_device *spi, const char *data, int len)
 463 {
 464         struct spi_transfer t;
 465         struct spi_message m;
 466         u8 msg[2];
 467
 468         if (len <= 0)
 469                 return 0;
 470
 471         msg[0] = data[0];
 472         msg[1] = data[1];
 473
 474         spi_message_init(&m);
 475         memset(&t, 0, (sizeof t));
 476
 477         t.tx_buf = &msg[0];
 478         t.len = len;
 479
 480         spi_message_add_tail(&t, &m);
 481         spi_sync(spi, &m);
 482
 483         return len;
 484 }
 485 #endif /* CONFIG_SPI_MASTER */
 486
 487 static int wm8728_probe(struct platform_device *pdev)
 488 {
 489         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 490         struct wm8728_setup_data *setup;
 491         struct snd_soc_codec *codec;
 492         int ret = 0;
 493
 494         setup = socdev->codec_data;
 495         codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 496         if (codec == NULL)
 497                 return -ENOMEM;
 498
 499         socdev->card->codec = codec;
 500         mutex_init(&codec->mutex);
 501         INIT_LIST_HEAD(&codec->dapm_widgets);
 502         INIT_LIST_HEAD(&codec->dapm_paths);
 503
 504         wm8728_socdev = socdev;
 505         ret = -ENODEV;
 506
 507 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 508         if (setup->i2c_address) {
 509                 codec->hw_write = (hw_write_t)i2c_master_send;
 510                 ret = wm8728_add_i2c_device(pdev, setup);
 511         }
 512 #endif
 513 #if defined(CONFIG_SPI_MASTER)
 514         if (setup->spi) {
 515                 codec->hw_write = (hw_write_t)wm8728_spi_write;
 516                 ret = spi_register_driver(&wm8728_spi_driver);
 517                 if (ret != 0)
 518                         printk(KERN_ERR "can't add spi driver");
 519         }
 520 #endif
 521
 522         if (ret != 0)
 523                 kfree(codec);
 524
 525         return ret;
 526 }
 527
 528 /* power down chip */
 529 static int wm8728_remove(struct platform_device *pdev)
 530 {
 531         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 532         struct snd_soc_codec *codec = socdev->card->codec;
 533
 534         if (codec->control_data)
 535                 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 536
 537         snd_soc_free_pcms(socdev);
 538         snd_soc_dapm_free(socdev);
 539 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 540         i2c_unregister_device(codec->control_data);
 541         i2c_del_driver(&wm8728_i2c_driver);
 542 #endif
 543 #if defined(CONFIG_SPI_MASTER)
 544         spi_unregister_driver(&wm8728_spi_driver);
 545 #endif
 546         kfree(codec);
 547
 548         return 0;
 549 }
 550
 551 struct snd_soc_codec_device soc_codec_dev_wm8728 = {
 552         .probe =        wm8728_probe,
 553         .remove =       wm8728_remove,
 554         .suspend =      wm8728_suspend,
 555         .resume =       wm8728_resume,
 556 };
 557 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);
 558
 559 static int __init wm8728_modinit(void)
 560 {
 561         return snd_soc_register_dai(&wm8728_dai);
 562 }
 563 module_init(wm8728_modinit);
 564
 565 static void __exit wm8728_exit(void)
 566 {
 567         snd_soc_unregister_dai(&wm8728_dai);
 568 }
 569 module_exit(wm8728_exit);
 570
 571 MODULE_DESCRIPTION("ASoC WM8728 driver");
 572 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 573 MODULE_LICENSE("GPL");