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wm8728.c

/*
 * wm8728.c  --  WM8728 ALSA SoC Audio driver
 *
 * Copyright 2008 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8728.h"

struct snd_soc_codec_device soc_codec_dev_wm8728;

/*
 * We can't read the WM8728 register space so we cache them instead.
 * Note that the defaults here aren't the physical defaults, we latch
 * the volume update bits, mute the output and enable infinite zero
 * detect.
 */
static const u16 wm8728_reg_defaults[] = {
      0x1ff,
      0x1ff,
      0x001,
      0x100,
};

static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);

static const struct snd_kcontrol_new wm8728_snd_controls[] = {

SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
             0, 255, 0, wm8728_tlv),

SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
};

/*
 * DAPM controls.
 */
static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_OUTPUT("VOUTL"),
SND_SOC_DAPM_OUTPUT("VOUTR"),
};

static const struct snd_soc_dapm_route intercon[] = {
      {"VOUTL", NULL, "DAC"},
      {"VOUTR", NULL, "DAC"},
};

static int wm8728_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
                          ARRAY_SIZE(wm8728_dapm_widgets));

      snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

      snd_soc_dapm_new_widgets(codec);

      return 0;
}

static int wm8728_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);

      if (mute)
            snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
      else
            snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);

      return 0;
}

static int wm8728_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params,
      struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      u16 dac = snd_soc_read(codec, WM8728_DACCTL);

      dac &= ~0x18;

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            dac |= 0x10;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            dac |= 0x08;
            break;
      default:
            return -EINVAL;
      }

      snd_soc_write(codec, WM8728_DACCTL, dac);

      return 0;
}

static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
            unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 iface = snd_soc_read(codec, WM8728_IFCTL);

      /* Currently only I2S is supported by the driver, though the
       * hardware is more flexible.
       */
      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            iface |= 1;
            break;
      default:
            return -EINVAL;
      }

      /* The hardware only support full slave mode */
      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBS_CFS:
            break;
      default:
            return -EINVAL;
      }

      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            iface &= ~0x22;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            iface |=  0x20;
            iface &= ~0x02;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            iface |= 0x02;
            iface &= ~0x20;
            break;
      case SND_SOC_DAIFMT_IB_IF:
            iface |= 0x22;
            break;
      default:
            return -EINVAL;
      }

      snd_soc_write(codec, WM8728_IFCTL, iface);
      return 0;
}

static int wm8728_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      u16 reg;
      int i;

      switch (level) {
      case SND_SOC_BIAS_ON:
      case SND_SOC_BIAS_PREPARE:
      case SND_SOC_BIAS_STANDBY:
            if (codec->bias_level == SND_SOC_BIAS_OFF) {
                  /* Power everything up... */
                  reg = snd_soc_read(codec, WM8728_DACCTL);
                  snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);

                  /* ..then sync in the register cache. */
                  for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
                        snd_soc_write(codec, i,
                                   snd_soc_read(codec, i));
            }
            break;

      case SND_SOC_BIAS_OFF:
            reg = snd_soc_read(codec, WM8728_DACCTL);
            snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
            break;
      }
      codec->bias_level = level;
      return 0;
}

#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)

#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8728_dai_ops = {
      .hw_params  = wm8728_hw_params,
      .digital_mute     = wm8728_mute,
      .set_fmt    = wm8728_set_dai_fmt,
};

struct snd_soc_dai wm8728_dai = {
      .name = "WM8728",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = WM8728_RATES,
            .formats = WM8728_FORMATS,
      },
      .ops = &wm8728_dai_ops,
};
EXPORT_SYMBOL_GPL(wm8728_dai);

static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static int wm8728_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      wm8728_set_bias_level(codec, codec->suspend_bias_level);

      return 0;
}

/*
 * initialise the WM8728 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int wm8728_init(struct snd_soc_device *socdev,
                   enum snd_soc_control_type control)
{
      struct snd_soc_codec *codec = socdev->card->codec;
      int ret = 0;

      codec->name = "WM8728";
      codec->owner = THIS_MODULE;
      codec->set_bias_level = wm8728_set_bias_level;
      codec->dai = &wm8728_dai;
      codec->num_dai = 1;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
      codec->reg_cache = kmemdup(wm8728_reg_defaults,
                           sizeof(wm8728_reg_defaults),
                           GFP_KERNEL);
      if (codec->reg_cache == NULL)
            return -ENOMEM;

      ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
      if (ret < 0) {
            printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
                   ret);
            goto err;
      }

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "wm8728: failed to create pcms\n");
            goto err;
      }

      /* power on device */
      wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      snd_soc_add_controls(codec, wm8728_snd_controls,
                        ARRAY_SIZE(wm8728_snd_controls));
      wm8728_add_widgets(codec);
      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "wm8728: failed to register card\n");
            goto card_err;
      }

      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
err:
      kfree(codec->reg_cache);
      return ret;
}

static struct snd_soc_device *wm8728_socdev;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

/*
 * WM8728 2 wire address is determined by GPIO5
 * state during powerup.
 *    low  = 0x1a
 *    high = 0x1b
 */

static int wm8728_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
      struct snd_soc_device *socdev = wm8728_socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      int ret;

      i2c_set_clientdata(i2c, codec);
      codec->control_data = i2c;

      ret = wm8728_init(socdev, SND_SOC_I2C);
      if (ret < 0)
            pr_err("failed to initialise WM8728\n");

      return ret;
}

static int wm8728_i2c_remove(struct i2c_client *client)
{
      struct snd_soc_codec *codec = i2c_get_clientdata(client);
      kfree(codec->reg_cache);
      return 0;
}

static const struct i2c_device_id wm8728_i2c_id[] = {
      { "wm8728", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);

static struct i2c_driver wm8728_i2c_driver = {
      .driver = {
            .name = "WM8728 I2C Codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8728_i2c_probe,
      .remove =   wm8728_i2c_remove,
      .id_table = wm8728_i2c_id,
};

static int wm8728_add_i2c_device(struct platform_device *pdev,
                         const struct wm8728_setup_data *setup)
{
      struct i2c_board_info info;
      struct i2c_adapter *adapter;
      struct i2c_client *client;
      int ret;

      ret = i2c_add_driver(&wm8728_i2c_driver);
      if (ret != 0) {
            dev_err(&pdev->dev, "can't add i2c driver\n");
            return ret;
      }

      memset(&info, 0, sizeof(struct i2c_board_info));
      info.addr = setup->i2c_address;
      strlcpy(info.type, "wm8728", I2C_NAME_SIZE);

      adapter = i2c_get_adapter(setup->i2c_bus);
      if (!adapter) {
            dev_err(&pdev->dev, "can't get i2c adapter %d\n",
                  setup->i2c_bus);
            goto err_driver;
      }

      client = i2c_new_device(adapter, &info);
      i2c_put_adapter(adapter);
      if (!client) {
            dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
                  (unsigned int)info.addr);
            goto err_driver;
      }

      return 0;

err_driver:
      i2c_del_driver(&wm8728_i2c_driver);
      return -ENODEV;
}
#endif

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8728_spi_probe(struct spi_device *spi)
{
      struct snd_soc_device *socdev = wm8728_socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      int ret;

      codec->control_data = spi;

      ret = wm8728_init(socdev, SND_SOC_SPI);
      if (ret < 0)
            dev_err(&spi->dev, "failed to initialise WM8728\n");

      return ret;
}

static int __devexit wm8728_spi_remove(struct spi_device *spi)
{
      return 0;
}

static struct spi_driver wm8728_spi_driver = {
      .driver = {
            .name = "wm8728",
            .bus  = &spi_bus_type,
            .owner      = THIS_MODULE,
      },
      .probe            = wm8728_spi_probe,
      .remove           = __devexit_p(wm8728_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

static int wm8728_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct wm8728_setup_data *setup;
      struct snd_soc_codec *codec;
      int ret = 0;

      setup = socdev->codec_data;
      codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (codec == NULL)
            return -ENOMEM;

      socdev->card->codec = codec;
      mutex_init(&codec->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      wm8728_socdev = socdev;
      ret = -ENODEV;

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      if (setup->i2c_address) {
            ret = wm8728_add_i2c_device(pdev, setup);
      }
#endif
#if defined(CONFIG_SPI_MASTER)
      if (setup->spi) {
            ret = spi_register_driver(&wm8728_spi_driver);
            if (ret != 0)
                  printk(KERN_ERR "can't add spi driver");
      }
#endif

      if (ret != 0)
            kfree(codec);

      return ret;
}

/* power down chip */
static int wm8728_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      if (codec->control_data)
            wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_unregister_device(codec->control_data);
      i2c_del_driver(&wm8728_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8728_spi_driver);
#endif
      kfree(codec);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8728 = {
      .probe =    wm8728_probe,
      .remove =   wm8728_remove,
      .suspend =  wm8728_suspend,
      .resume =   wm8728_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);

static int __init wm8728_modinit(void)
{
      return snd_soc_register_dai(&wm8728_dai);
}
module_init(wm8728_modinit);

static void __exit wm8728_exit(void)
{
      snd_soc_unregister_dai(&wm8728_dai);
}
module_exit(wm8728_exit);

MODULE_DESCRIPTION("ASoC WM8728 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");

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