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wm8711.c

/*
 * wm8711.c  --  WM8711 ALSA SoC Audio driver
 *
 * Copyright 2006 Wolfson Microelectronics
 *
 * Author: Mike Arthur <linux@wolfsonmicro.com>
 *
 * Based on wm8731.c by Richard Purdie
 *
 * 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/tlv.h>
#include <sound/initval.h>

#include "wm8711.h"

static struct snd_soc_codec *wm8711_codec;

/* codec private data */
struct wm8711_priv {
      struct snd_soc_codec codec;
      u16 reg_cache[WM8711_CACHEREGNUM];
      unsigned int sysclk;
};

/*
 * wm8711 register cache
 * We can't read the WM8711 register space when we are
 * using 2 wire for device control, so we cache them instead.
 * There is no point in caching the reset register
 */
static const u16 wm8711_reg[WM8711_CACHEREGNUM] = {
      0x0079, 0x0079, 0x000a, 0x0008,
      0x009f, 0x000a, 0x0000, 0x0000
};

#define wm8711_reset(c) snd_soc_write(c, WM8711_RESET, 0)

static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);

static const struct snd_kcontrol_new wm8711_snd_controls[] = {

SOC_DOUBLE_R_TLV("Master Playback Volume", WM8711_LOUT1V, WM8711_ROUT1V,
             0, 127, 0, out_tlv),
SOC_DOUBLE_R("Master Playback ZC Switch", WM8711_LOUT1V, WM8711_ROUT1V,
      7, 1, 0),

};

/* Output Mixer */
static const struct snd_kcontrol_new wm8711_output_mixer_controls[] = {
SOC_DAPM_SINGLE("Line Bypass Switch", WM8711_APANA, 3, 1, 0),
SOC_DAPM_SINGLE("HiFi Playback Switch", WM8711_APANA, 4, 1, 0),
};

static const struct snd_soc_dapm_widget wm8711_dapm_widgets[] = {
SND_SOC_DAPM_MIXER("Output Mixer", WM8711_PWR, 4, 1,
      &wm8711_output_mixer_controls[0],
      ARRAY_SIZE(wm8711_output_mixer_controls)),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8711_PWR, 3, 1),
SND_SOC_DAPM_OUTPUT("LOUT"),
SND_SOC_DAPM_OUTPUT("LHPOUT"),
SND_SOC_DAPM_OUTPUT("ROUT"),
SND_SOC_DAPM_OUTPUT("RHPOUT"),
};

static const struct snd_soc_dapm_route intercon[] = {
      /* output mixer */
      {"Output Mixer", "Line Bypass Switch", "Line Input"},
      {"Output Mixer", "HiFi Playback Switch", "DAC"},

      /* outputs */
      {"RHPOUT", NULL, "Output Mixer"},
      {"ROUT", NULL, "Output Mixer"},
      {"LHPOUT", NULL, "Output Mixer"},
      {"LOUT", NULL, "Output Mixer"},
};

static int wm8711_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, wm8711_dapm_widgets,
                          ARRAY_SIZE(wm8711_dapm_widgets));

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

      return 0;
}

struct _coeff_div {
      u32 mclk;
      u32 rate;
      u16 fs;
      u8 sr:4;
      u8 bosr:1;
      u8 usb:1;
};

/* codec mclk clock divider coefficients */
static const struct _coeff_div coeff_div[] = {
      /* 48k */
      {12288000, 48000, 256, 0x0, 0x0, 0x0},
      {18432000, 48000, 384, 0x0, 0x1, 0x0},
      {12000000, 48000, 250, 0x0, 0x0, 0x1},

      /* 32k */
      {12288000, 32000, 384, 0x6, 0x0, 0x0},
      {18432000, 32000, 576, 0x6, 0x1, 0x0},
      {12000000, 32000, 375, 0x6, 0x0, 0x1},

      /* 8k */
      {12288000, 8000, 1536, 0x3, 0x0, 0x0},
      {18432000, 8000, 2304, 0x3, 0x1, 0x0},
      {11289600, 8000, 1408, 0xb, 0x0, 0x0},
      {16934400, 8000, 2112, 0xb, 0x1, 0x0},
      {12000000, 8000, 1500, 0x3, 0x0, 0x1},

      /* 96k */
      {12288000, 96000, 128, 0x7, 0x0, 0x0},
      {18432000, 96000, 192, 0x7, 0x1, 0x0},
      {12000000, 96000, 125, 0x7, 0x0, 0x1},

      /* 44.1k */
      {11289600, 44100, 256, 0x8, 0x0, 0x0},
      {16934400, 44100, 384, 0x8, 0x1, 0x0},
      {12000000, 44100, 272, 0x8, 0x1, 0x1},

      /* 88.2k */
      {11289600, 88200, 128, 0xf, 0x0, 0x0},
      {16934400, 88200, 192, 0xf, 0x1, 0x0},
      {12000000, 88200, 136, 0xf, 0x1, 0x1},
};

static inline int get_coeff(int mclk, int rate)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
            if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
                  return i;
      }
      return 0;
}

static int wm8711_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 wm8711_priv *wm8711 = codec->private_data;
      u16 iface = snd_soc_read(codec, WM8711_IFACE) & 0xfffc;
      int i = get_coeff(wm8711->sysclk, params_rate(params));
      u16 srate = (coeff_div[i].sr << 2) |
            (coeff_div[i].bosr << 1) | coeff_div[i].usb;

      snd_soc_write(codec, WM8711_SRATE, srate);

      /* bit size */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      case SNDRV_PCM_FORMAT_S20_3LE:
            iface |= 0x0004;
            break;
      case SNDRV_PCM_FORMAT_S24_LE:
            iface |= 0x0008;
            break;
      }

      snd_soc_write(codec, WM8711_IFACE, iface);
      return 0;
}

static int wm8711_pcm_prepare(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;

      /* set active */
      snd_soc_write(codec, WM8711_ACTIVE, 0x0001);

      return 0;
}

static void wm8711_shutdown(struct snd_pcm_substream *substream,
                      struct snd_soc_dai *dai)
{
      struct snd_soc_codec *codec = dai->codec;

      /* deactivate */
      if (!codec->active) {
            udelay(50);
            snd_soc_write(codec, WM8711_ACTIVE, 0x0);
      }
}

static int wm8711_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u16 mute_reg = snd_soc_read(codec, WM8711_APDIGI) & 0xfff7;

      if (mute)
            snd_soc_write(codec, WM8711_APDIGI, mute_reg | 0x8);
      else
            snd_soc_write(codec, WM8711_APDIGI, mute_reg);

      return 0;
}

static int wm8711_set_dai_sysclk(struct snd_soc_dai *codec_dai,
            int clk_id, unsigned int freq, int dir)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      struct wm8711_priv *wm8711 = codec->private_data;

      switch (freq) {
      case 11289600:
      case 12000000:
      case 12288000:
      case 16934400:
      case 18432000:
            wm8711->sysclk = freq;
            return 0;
      }
      return -EINVAL;
}

static int wm8711_set_dai_fmt(struct snd_soc_dai *codec_dai,
            unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u16 iface = 0;

      /* set master/slave audio interface */
      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            iface |= 0x0040;
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            break;
      default:
            return -EINVAL;
      }

      /* interface format */
      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;
      case SND_SOC_DAIFMT_DSP_A:
            iface |= 0x0003;
            break;
      case SND_SOC_DAIFMT_DSP_B:
            iface |= 0x0013;
            break;
      default:
            return -EINVAL;
      }

      /* clock inversion */
      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            break;
      case SND_SOC_DAIFMT_IB_IF:
            iface |= 0x0090;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            iface |= 0x0080;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            iface |= 0x0010;
            break;
      default:
            return -EINVAL;
      }

      /* set iface */
      snd_soc_write(codec, WM8711_IFACE, iface);
      return 0;
}


static int wm8711_set_bias_level(struct snd_soc_codec *codec,
      enum snd_soc_bias_level level)
{
      u16 reg = snd_soc_read(codec, WM8711_PWR) & 0xff7f;

      switch (level) {
      case SND_SOC_BIAS_ON:
            snd_soc_write(codec, WM8711_PWR, reg);
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            snd_soc_write(codec, WM8711_PWR, reg | 0x0040);
            break;
      case SND_SOC_BIAS_OFF:
            snd_soc_write(codec, WM8711_ACTIVE, 0x0);
            snd_soc_write(codec, WM8711_PWR, 0xffff);
            break;
      }
      codec->bias_level = level;
      return 0;
}

#define WM8711_RATES SNDRV_PCM_RATE_8000_96000

#define WM8711_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
      SNDRV_PCM_FMTBIT_S24_LE)

static struct snd_soc_dai_ops wm8711_ops = {
      .prepare = wm8711_pcm_prepare,
      .hw_params = wm8711_hw_params,
      .shutdown = wm8711_shutdown,
      .digital_mute = wm8711_mute,
      .set_sysclk = wm8711_set_dai_sysclk,
      .set_fmt = wm8711_set_dai_fmt,
};

struct snd_soc_dai wm8711_dai = {
      .name = "WM8711",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = WM8711_RATES,
            .formats = WM8711_FORMATS,
      },
      .ops = &wm8711_ops,
};
EXPORT_SYMBOL_GPL(wm8711_dai);

static int wm8711_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;

      snd_soc_write(codec, WM8711_ACTIVE, 0x0);
      wm8711_set_bias_level(codec, SND_SOC_BIAS_OFF);
      return 0;
}

static int wm8711_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;
      int i;
      u8 data[2];
      u16 *cache = codec->reg_cache;

      /* Sync reg_cache with the hardware */
      for (i = 0; i < ARRAY_SIZE(wm8711_reg); i++) {
            data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
            data[1] = cache[i] & 0x00ff;
            codec->hw_write(codec->control_data, data, 2);
      }
      wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      wm8711_set_bias_level(codec, codec->suspend_bias_level);
      return 0;
}

static int wm8711_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      if (wm8711_codec == NULL) {
            dev_err(&pdev->dev, "Codec device not registered\n");
            return -ENODEV;
      }

      socdev->card->codec = wm8711_codec;
      codec = wm8711_codec;

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(codec->dev, "failed to create pcms: %d\n", ret);
            goto pcm_err;
      }

      snd_soc_add_controls(codec, wm8711_snd_controls,
                       ARRAY_SIZE(wm8711_snd_controls));
      wm8711_add_widgets(codec);

      return ret;

pcm_err:
      return ret;
}

/* power down chip */
static int wm8711_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8711 = {
      .probe =    wm8711_probe,
      .remove =   wm8711_remove,
      .suspend =  wm8711_suspend,
      .resume =   wm8711_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8711);

static int wm8711_register(struct wm8711_priv *wm8711,
                     enum snd_soc_control_type control)
{
      int ret;
      struct snd_soc_codec *codec = &wm8711->codec;
      u16 reg;

      if (wm8711_codec) {
            dev_err(codec->dev, "Another WM8711 is registered\n");
            return -EINVAL;
      }

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

      codec->private_data = wm8711;
      codec->name = "WM8711";
      codec->owner = THIS_MODULE;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->set_bias_level = wm8711_set_bias_level;
      codec->dai = &wm8711_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = WM8711_CACHEREGNUM;
      codec->reg_cache = &wm8711->reg_cache;

      memcpy(codec->reg_cache, wm8711_reg, sizeof(wm8711_reg));

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

      ret = wm8711_reset(codec);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to issue reset\n");
            goto err;
      }

      wm8711_dai.dev = codec->dev;

      wm8711_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* Latch the update bits */
      reg = snd_soc_read(codec, WM8711_LOUT1V);
      snd_soc_write(codec, WM8711_LOUT1V, reg | 0x0100);
      reg = snd_soc_read(codec, WM8711_ROUT1V);
      snd_soc_write(codec, WM8711_ROUT1V, reg | 0x0100);

      wm8711_codec = codec;

      ret = snd_soc_register_codec(codec);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register codec: %d\n", ret);
            goto err;
      }

      ret = snd_soc_register_dai(&wm8711_dai);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            goto err_codec;
      }

      return 0;

err_codec:
      snd_soc_unregister_codec(codec);
err:
      kfree(wm8711);
      return ret;
}

static void wm8711_unregister(struct wm8711_priv *wm8711)
{
      wm8711_set_bias_level(&wm8711->codec, SND_SOC_BIAS_OFF);
      snd_soc_unregister_dai(&wm8711_dai);
      snd_soc_unregister_codec(&wm8711->codec);
      kfree(wm8711);
      wm8711_codec = NULL;
}

#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8711_spi_probe(struct spi_device *spi)
{
      struct snd_soc_codec *codec;
      struct wm8711_priv *wm8711;

      wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
      if (wm8711 == NULL)
            return -ENOMEM;

      codec = &wm8711->codec;
      codec->control_data = spi;
      codec->dev = &spi->dev;

      dev_set_drvdata(&spi->dev, wm8711);

      return wm8711_register(wm8711, SND_SOC_SPI);
}

static int __devexit wm8711_spi_remove(struct spi_device *spi)
{
      struct wm8711_priv *wm8711 = dev_get_drvdata(&spi->dev);

      wm8711_unregister(wm8711);

      return 0;
}

static struct spi_driver wm8711_spi_driver = {
      .driver = {
            .name = "wm8711",
            .bus  = &spi_bus_type,
            .owner      = THIS_MODULE,
      },
      .probe            = wm8711_spi_probe,
      .remove           = __devexit_p(wm8711_spi_remove),
};
#endif /* CONFIG_SPI_MASTER */

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8711_i2c_probe(struct i2c_client *i2c,
                              const struct i2c_device_id *id)
{
      struct wm8711_priv *wm8711;
      struct snd_soc_codec *codec;

      wm8711 = kzalloc(sizeof(struct wm8711_priv), GFP_KERNEL);
      if (wm8711 == NULL)
            return -ENOMEM;

      codec = &wm8711->codec;
      codec->hw_write = (hw_write_t)i2c_master_send;

      i2c_set_clientdata(i2c, wm8711);
      codec->control_data = i2c;

      codec->dev = &i2c->dev;

      return wm8711_register(wm8711, SND_SOC_I2C);
}

static __devexit int wm8711_i2c_remove(struct i2c_client *client)
{
      struct wm8711_priv *wm8711 = i2c_get_clientdata(client);
      wm8711_unregister(wm8711);
      return 0;
}

static const struct i2c_device_id wm8711_i2c_id[] = {
      { "wm8711", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, wm8711_i2c_id);

static struct i2c_driver wm8711_i2c_driver = {
      .driver = {
            .name = "WM8711 I2C Codec",
            .owner = THIS_MODULE,
      },
      .probe =    wm8711_i2c_probe,
      .remove =   __devexit_p(wm8711_i2c_remove),
      .id_table = wm8711_i2c_id,
};
#endif

static int __init wm8711_modinit(void)
{
      int ret;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&wm8711_i2c_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register WM8711 I2C driver: %d\n",
                   ret);
      }
#endif
#if defined(CONFIG_SPI_MASTER)
      ret = spi_register_driver(&wm8711_spi_driver);
      if (ret != 0) {
            printk(KERN_ERR "Failed to register WM8711 SPI driver: %d\n",
                   ret);
      }
#endif
      return 0;
}
module_init(wm8711_modinit);

static void __exit wm8711_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&wm8711_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
      spi_unregister_driver(&wm8711_spi_driver);
#endif
}
module_exit(wm8711_exit);

MODULE_DESCRIPTION("ASoC WM8711 driver");
MODULE_AUTHOR("Mike Arthur");
MODULE_LICENSE("GPL");

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