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wm8776.c

/*
 * wm8776.c  --  WM8776 ALSA SoC Audio driver
 *
 * Copyright 2009 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.
 *
 * TODO: Input ALC/limiter support
 */

#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 <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "wm8776.h"

/* codec private data */
00034 struct wm8776_priv {
      enum snd_soc_control_type control_type;
      int sysclk[2];
};

static const u16 wm8776_reg[WM8776_CACHEREGNUM] = {
      0x79, 0x79, 0x79, 0xff, 0xff,  /* 4 */
      0xff, 0x00, 0x90, 0x00, 0x00,  /* 9 */
      0x22, 0x22, 0x22, 0x08, 0xcf,  /* 14 */
      0xcf, 0x7b, 0x00, 0x32, 0x00,  /* 19 */
      0xa6, 0x01, 0x01
};

static int wm8776_reset(struct snd_soc_codec *codec)
{
      return snd_soc_write(codec, WM8776_RESET, 0);
}

static const DECLARE_TLV_DB_SCALE(hp_tlv, -12100, 100, 1);
static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(adc_tlv, -10350, 50, 1);

static const struct snd_kcontrol_new wm8776_snd_controls[] = {
SOC_DOUBLE_R_TLV("Headphone Playback Volume", WM8776_HPLVOL, WM8776_HPRVOL,
             0, 127, 0, hp_tlv),
SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8776_DACLVOL, WM8776_DACRVOL,
             0, 255, 0, dac_tlv),
SOC_SINGLE("Digital Playback ZC Switch", WM8776_DACCTRL1, 0, 1, 0),

SOC_SINGLE("Deemphasis Switch", WM8776_DACCTRL2, 0, 1, 0),

SOC_DOUBLE_R_TLV("Capture Volume", WM8776_ADCLVOL, WM8776_ADCRVOL,
             0, 255, 0, adc_tlv),
SOC_DOUBLE("Capture Switch", WM8776_ADCMUX, 7, 6, 1, 1),
SOC_DOUBLE_R("Capture ZC Switch", WM8776_ADCLVOL, WM8776_ADCRVOL, 8, 1, 0),
SOC_SINGLE("Capture HPF Switch", WM8776_ADCIFCTRL, 8, 1, 1),
};

static const struct snd_kcontrol_new inmix_controls[] = {
SOC_DAPM_SINGLE("AIN1 Switch", WM8776_ADCMUX, 0, 1, 0),
SOC_DAPM_SINGLE("AIN2 Switch", WM8776_ADCMUX, 1, 1, 0),
SOC_DAPM_SINGLE("AIN3 Switch", WM8776_ADCMUX, 2, 1, 0),
SOC_DAPM_SINGLE("AIN4 Switch", WM8776_ADCMUX, 3, 1, 0),
SOC_DAPM_SINGLE("AIN5 Switch", WM8776_ADCMUX, 4, 1, 0),
};

static const struct snd_kcontrol_new outmix_controls[] = {
SOC_DAPM_SINGLE("DAC Switch", WM8776_OUTMUX, 0, 1, 0),
SOC_DAPM_SINGLE("AUX Switch", WM8776_OUTMUX, 1, 1, 0),
SOC_DAPM_SINGLE("Bypass Switch", WM8776_OUTMUX, 2, 1, 0),
};

static const struct snd_soc_dapm_widget wm8776_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AUX"),

SND_SOC_DAPM_INPUT("AIN1"),
SND_SOC_DAPM_INPUT("AIN2"),
SND_SOC_DAPM_INPUT("AIN3"),
SND_SOC_DAPM_INPUT("AIN4"),
SND_SOC_DAPM_INPUT("AIN5"),

SND_SOC_DAPM_MIXER("Input Mixer", WM8776_PWRDOWN, 6, 1,
               inmix_controls, ARRAY_SIZE(inmix_controls)),

SND_SOC_DAPM_ADC("ADC", "Capture", WM8776_PWRDOWN, 1, 1),
SND_SOC_DAPM_DAC("DAC", "Playback", WM8776_PWRDOWN, 2, 1),

SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0,
               outmix_controls, ARRAY_SIZE(outmix_controls)),

SND_SOC_DAPM_PGA("Headphone PGA", WM8776_PWRDOWN, 3, 1, NULL, 0),

SND_SOC_DAPM_OUTPUT("VOUT"),

SND_SOC_DAPM_OUTPUT("HPOUTL"),
SND_SOC_DAPM_OUTPUT("HPOUTR"),
};

static const struct snd_soc_dapm_route routes[] = {
      { "Input Mixer", "AIN1 Switch", "AIN1" },
      { "Input Mixer", "AIN2 Switch", "AIN2" },
      { "Input Mixer", "AIN3 Switch", "AIN3" },
      { "Input Mixer", "AIN4 Switch", "AIN4" },
      { "Input Mixer", "AIN5 Switch", "AIN5" },

      { "ADC", NULL, "Input Mixer" },

      { "Output Mixer", "DAC Switch", "DAC" },
      { "Output Mixer", "AUX Switch", "AUX" },
      { "Output Mixer", "Bypass Switch", "Input Mixer" },

      { "VOUT", NULL, "Output Mixer" },

      { "Headphone PGA", NULL, "Output Mixer" },

      { "HPOUTL", NULL, "Headphone PGA" },
      { "HPOUTR", NULL, "Headphone PGA" },
};

static int wm8776_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
      struct snd_soc_codec *codec = dai->codec;
      int reg, iface, master;

      switch (dai->driver->id) {
      case WM8776_DAI_DAC:
            reg = WM8776_DACIFCTRL;
            master = 0x80;
            break;
      case WM8776_DAI_ADC:
            reg = WM8776_ADCIFCTRL;
            master = 0x100;
            break;
      default:
            return -EINVAL;
      }

      iface = 0;

      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            master = 0;
            break;
      default:
            return -EINVAL;
      }

      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            iface |= 0x0002;
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            iface |= 0x0001;
            break;
      default:
            return -EINVAL;
      }

      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            break;
      case SND_SOC_DAIFMT_IB_IF:
            iface |= 0x00c;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            iface |= 0x008;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            iface |= 0x004;
            break;
      default:
            return -EINVAL;
      }

      /* Finally, write out the values */
      snd_soc_update_bits(codec, reg, 0xf, iface);
      snd_soc_update_bits(codec, WM8776_MSTRCTRL, 0x180, master);

      return 0;
}

static int mclk_ratios[] = {
      128,
      192,
      256,
      384,
      512,
      768,
};

static int wm8776_hw_params(struct snd_pcm_substream *substream,
                      struct snd_pcm_hw_params *params,
                      struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;
      struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);
      int iface_reg, iface;
      int ratio_shift, master;
      int i;

      iface = 0;

      switch (dai->driver->id) {
      case WM8776_DAI_DAC:
            iface_reg = WM8776_DACIFCTRL;
            master = 0x80;
            ratio_shift = 4;
            break;
      case WM8776_DAI_ADC:
            iface_reg = WM8776_ADCIFCTRL;
            master = 0x100;
            ratio_shift = 0;
            break;
      default:
            return -EINVAL;
      }


      /* Set word length */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            iface |= 0x10;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            iface |= 0x20;
            break;
      case SNDRV_PCM_FORMAT_S32_LE:
            iface |= 0x30;
            break;
      }

      /* Only need to set MCLK/LRCLK ratio if we're master */
      if (snd_soc_read(codec, WM8776_MSTRCTRL) & master) {
            for (i = 0; i < ARRAY_SIZE(mclk_ratios); i++) {
                  if (wm8776->sysclk[dai->driver->id] / params_rate(params)
                      == mclk_ratios[i])
                        break;
            }

            if (i == ARRAY_SIZE(mclk_ratios)) {
                  dev_err(codec->dev,
                        "Unable to configure MCLK ratio %d/%d\n",
                        wm8776->sysclk[dai->driver->id], params_rate(params));
                  return -EINVAL;
            }

            dev_dbg(codec->dev, "MCLK is %dfs\n", mclk_ratios[i]);

            snd_soc_update_bits(codec, WM8776_MSTRCTRL,
                            0x7 << ratio_shift, i << ratio_shift);
      } else {
            dev_dbg(codec->dev, "DAI in slave mode\n");
      }

      snd_soc_update_bits(codec, iface_reg, 0x30, iface);

      return 0;
}

static int wm8776_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;

      return snd_soc_write(codec, WM8776_DACMUTE, !!mute);
}

static int wm8776_set_sysclk(struct snd_soc_dai *dai,
                       int clk_id, unsigned int freq, int dir)
{
      struct snd_soc_codec *codec = dai->codec;
      struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);

      BUG_ON(dai->driver->id >= ARRAY_SIZE(wm8776->sysclk));

      wm8776->sysclk[dai->driver->id] = freq;

      return 0;
}

static int wm8776_set_bias_level(struct snd_soc_codec *codec,
                         enum snd_soc_bias_level level)
{
      switch (level) {
      case SND_SOC_BIAS_ON:
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
                  /* Disable the global powerdown; DAPM does the rest */
                  snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 0);
            }

            break;
      case SND_SOC_BIAS_OFF:
            snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 1);
            break;
      }

      codec->dapm.bias_level = level;
      return 0;
}

#define WM8776_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
                  SNDRV_PCM_RATE_96000)


#define WM8776_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
                  SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_ops wm8776_dac_ops = {
      .digital_mute     = wm8776_mute,
      .hw_params      = wm8776_hw_params,
      .set_fmt        = wm8776_set_fmt,
      .set_sysclk     = wm8776_set_sysclk,
};

static struct snd_soc_dai_ops wm8776_adc_ops = {
      .hw_params      = wm8776_hw_params,
      .set_fmt        = wm8776_set_fmt,
      .set_sysclk     = wm8776_set_sysclk,
};

static struct snd_soc_dai_driver wm8776_dai[] = {
      {
            .name = "wm8776-hifi-playback",
            .id   = WM8776_DAI_DAC,
            .playback = {
                  .stream_name = "Playback",
                  .channels_min = 2,
                  .channels_max = 2,
                  .rates = WM8776_RATES,
                  .formats = WM8776_FORMATS,
            },
            .ops = &wm8776_dac_ops,
      },
      {
            .name = "wm8776-hifi-capture",
            .id   = WM8776_DAI_ADC,
            .capture = {
                  .stream_name = "Capture",
                  .channels_min = 2,
                  .channels_max = 2,
                  .rates = WM8776_RATES,
                  .formats = WM8776_FORMATS,
            },
            .ops = &wm8776_adc_ops,
      },
};

#ifdef CONFIG_PM
static int wm8776_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
      wm8776_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static int wm8776_resume(struct snd_soc_codec *codec)
{
      int i;
      u8 data[2];
      u16 *cache = codec->reg_cache;

      /* Sync reg_cache with the hardware */
      for (i = 0; i < ARRAY_SIZE(wm8776_reg); i++) {
            if (cache[i] == wm8776_reg[i])
                  continue;
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }

      wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      return 0;
}
#else
#define wm8776_suspend NULL
#define wm8776_resume NULL
#endif

static int wm8776_probe(struct snd_soc_codec *codec)
{
      struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret = 0;

      ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8776->control_type);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
            return ret;
      }

      ret = wm8776_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
            return ret;
      }

      wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* Latch the update bits; right channel only since we always
       * update both. */
      snd_soc_update_bits(codec, WM8776_HPRVOL, 0x100, 0x100);
      snd_soc_update_bits(codec, WM8776_DACRVOL, 0x100, 0x100);

      snd_soc_add_controls(codec, wm8776_snd_controls,
                       ARRAY_SIZE(wm8776_snd_controls));
      snd_soc_dapm_new_controls(dapm, wm8776_dapm_widgets,
                          ARRAY_SIZE(wm8776_dapm_widgets));
      snd_soc_dapm_add_routes(dapm, routes, ARRAY_SIZE(routes));

      return ret;
}

/* power down chip */
static int wm8776_remove(struct snd_soc_codec *codec)
{
      wm8776_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_wm8776 = {
      .probe =    wm8776_probe,
      .remove =   wm8776_remove,
      .suspend =  wm8776_suspend,
      .resume =   wm8776_resume,
      .set_bias_level = wm8776_set_bias_level,
      .reg_cache_size = ARRAY_SIZE(wm8776_reg),
      .reg_word_size = sizeof(u16),
      .reg_cache_default = wm8776_reg,
};

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8776_spi_probe(struct spi_device *spi)
{
      struct wm8776_priv *wm8776;
      int ret;

      wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
      if (wm8776 == NULL)
            return -ENOMEM;

      wm8776->control_type = SND_SOC_SPI;
      spi_set_drvdata(spi, wm8776);

      ret = snd_soc_register_codec(&spi->dev,
                  &soc_codec_dev_wm8776, wm8776_dai, ARRAY_SIZE(wm8776_dai));
      if (ret < 0)
            kfree(wm8776);
      return ret;
}

static int __devexit wm8776_spi_remove(struct spi_device *spi)
{
      snd_soc_unregister_codec(&spi->dev);
      kfree(spi_get_drvdata(spi));
      return 0;
}

static struct spi_driver wm8776_spi_driver = {
      .driver = {
            .name = "wm8776-codec",
            .owner      = THIS_MODULE,
      },
      .probe            = wm8776_spi_probe,
      .remove           = __devexit_p(wm8776_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8776_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8776_priv *wm8776;
      int ret;

      wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
      if (wm8776 == NULL)
            return -ENOMEM;

      i2c_set_clientdata(i2c, wm8776);
      wm8776->control_type = SND_SOC_I2C;

      ret =  snd_soc_register_codec(&i2c->dev,
                  &soc_codec_dev_wm8776, wm8776_dai, ARRAY_SIZE(wm8776_dai));
      if (ret < 0)
            kfree(wm8776);
      return ret;
}

static __devexit int wm8776_i2c_remove(struct i2c_client *client)
{
      snd_soc_unregister_codec(&client->dev);
      kfree(i2c_get_clientdata(client));
      return 0;
}

static const struct i2c_device_id wm8776_i2c_id[] = {
      { "wm8776", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8776_i2c_id);

static struct i2c_driver wm8776_i2c_driver = {
      .driver = {
            .name = "wm8776-codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8776_i2c_probe,
      .remove =   __devexit_p(wm8776_i2c_remove),
      .id_table = wm8776_i2c_id,
};
#endif

static int __init wm8776_modinit(void)
{
      int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8776_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register wm8776 I2C driver: %d\n",
                   ret);
      }
#endif
#if defined(CONFIG_SPI_MASTER)
      ret = spi_register_driver(&wm8776_spi_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register wm8776 SPI driver: %d\n",
                   ret);
      }
#endif
      return ret;
}
module_init(wm8776_modinit);

static void __exit wm8776_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8776_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8776_spi_driver);
#endif
}
module_exit(wm8776_exit);

MODULE_DESCRIPTION("ASoC WM8776 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");

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