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tlv320aic26.c

/*
 * Texas Instruments TLV320AIC26 low power audio CODEC
 * ALSA SoC CODEC driver
 *
 * Copyright (C) 2008 Secret Lab Technologies Ltd.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/sysfs.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/soc-of-simple.h>
#include <sound/initval.h>

#include "tlv320aic26.h"

MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");

/* AIC26 driver private data */
struct aic26 {
      struct spi_device *spi;
      struct snd_soc_codec codec;
      u16 reg_cache[AIC26_NUM_REGS];      /* shadow registers */
      int master;
      int datfm;
      int mclk;

      /* Keyclick parameters */
      int keyclick_amplitude;
      int keyclick_freq;
      int keyclick_len;
};

/* ---------------------------------------------------------------------
 * Register access routines
 */
static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
                           unsigned int reg)
{
      struct aic26 *aic26 = codec->private_data;
      u16 *cache = codec->reg_cache;
      u16 cmd, value;
      u8 buffer[2];
      int rc;

      if (reg >= AIC26_NUM_REGS) {
            WARN_ON_ONCE(1);
            return 0;
      }

      /* Do SPI transfer; first 16bits are command; remaining is
       * register contents */
      cmd = AIC26_READ_COMMAND_WORD(reg);
      buffer[0] = (cmd >> 8) & 0xff;
      buffer[1] = cmd & 0xff;
      rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
      if (rc) {
            dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
            return -EIO;
      }
      value = (buffer[0] << 8) | buffer[1];

      /* Update the cache before returning with the value */
      cache[reg] = value;
      return value;
}

static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
                               unsigned int reg)
{
      u16 *cache = codec->reg_cache;

      if (reg >= AIC26_NUM_REGS) {
            WARN_ON_ONCE(1);
            return 0;
      }

      return cache[reg];
}

static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
                     unsigned int value)
{
      struct aic26 *aic26 = codec->private_data;
      u16 *cache = codec->reg_cache;
      u16 cmd;
      u8 buffer[4];
      int rc;

      if (reg >= AIC26_NUM_REGS) {
            WARN_ON_ONCE(1);
            return -EINVAL;
      }

      /* Do SPI transfer; first 16bits are command; remaining is data
       * to write into register */
      cmd = AIC26_WRITE_COMMAND_WORD(reg);
      buffer[0] = (cmd >> 8) & 0xff;
      buffer[1] = cmd & 0xff;
      buffer[2] = value >> 8;
      buffer[3] = value;
      rc = spi_write(aic26->spi, buffer, 4);
      if (rc) {
            dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
            return -EIO;
      }

      /* update cache before returning */
      cache[reg] = value;
      return 0;
}

/* ---------------------------------------------------------------------
 * Digital Audio Interface Operations
 */
static int aic26_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;
      struct aic26 *aic26 = codec->private_data;
      int fsref, divisor, wlen, pval, jval, dval, qval;
      u16 reg;

      dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
            substream, params);
      dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
            params_format(params));

      switch (params_rate(params)) {
      case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
      case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
      case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
      case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
      case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
      case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
      case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
      case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
      case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
      default:
            dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
      }

      /* select data word length */
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S8:     wlen = AIC26_WLEN_16; break;
      case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
      case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
      case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
      default:
            dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
      }

      /* Configure PLL */
      pval = 1;
      jval = (fsref == 44100) ? 7 : 8;
      dval = (fsref == 44100) ? 5264 : 1920;
      qval = 0;
      reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
      aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
      reg = dval << 2;
      aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);

      /* Audio Control 3 (master mode, fsref rate) */
      reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
      reg &= ~0xf800;
      if (aic26->master)
            reg |= 0x0800;
      if (fsref == 48000)
            reg |= 0x2000;
      aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);

      /* Audio Control 1 (FSref divisor) */
      reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
      reg &= ~0x0fff;
      reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
      aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);

      return 0;
}

/**
 * aic26_mute - Mute control to reduce noise when changing audio format
 */
static int aic26_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      struct aic26 *aic26 = codec->private_data;
      u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);

      dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
            dai, mute);

      if (mute)
            reg |= 0x8080;
      else
            reg &= ~0x8080;
      aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);

      return 0;
}

static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
                      int clk_id, unsigned int freq, int dir)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      struct aic26 *aic26 = codec->private_data;

      dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
            " freq=%i, dir=%i)\n",
            codec_dai, clk_id, freq, dir);

      /* MCLK needs to fall between 2MHz and 50 MHz */
      if ((freq < 2000000) || (freq > 50000000))
            return -EINVAL;

      aic26->mclk = freq;
      return 0;
}

static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      struct aic26 *aic26 = codec->private_data;

      dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
            codec_dai, fmt);

      /* set master/slave audio interface */
      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
      case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
      default:
            dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
      }

      /* interface format */
      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
      case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
      case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
      case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
      default:
            dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
      }

      return 0;
}

/* ---------------------------------------------------------------------
 * Digital Audio Interface Definition
 */
#define AIC26_RATES     (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
                   SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
                   SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
                   SNDRV_PCM_RATE_48000)
#define AIC26_FORMATS   (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
                   SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)

static struct snd_soc_dai_ops aic26_dai_ops = {
      .hw_params  = aic26_hw_params,
      .digital_mute     = aic26_mute,
      .set_sysclk = aic26_set_sysclk,
      .set_fmt    = aic26_set_fmt,
};

struct snd_soc_dai aic26_dai = {
      .name = "tlv320aic26",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = AIC26_RATES,
            .formats = AIC26_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = AIC26_RATES,
            .formats = AIC26_FORMATS,
      },
      .ops = &aic26_dai_ops,
};
EXPORT_SYMBOL_GPL(aic26_dai);

/* ---------------------------------------------------------------------
 * ALSA controls
 */
static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
static const struct soc_enum aic26_capture_src_enum =
      SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);

static const struct snd_kcontrol_new aic26_snd_controls[] = {
      /* Output */
      SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
      SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
      SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
      SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
      SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
      SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
      SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
      SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
      SOC_ENUM("Capture Source", aic26_capture_src_enum),
};

/* ---------------------------------------------------------------------
 * SoC CODEC portion of driver: probe and release routines
 */
static int aic26_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      struct aic26 *aic26;
      int ret, err;

      dev_info(&pdev->dev, "Probing AIC26 SoC CODEC driver\n");
      dev_dbg(&pdev->dev, "socdev=%p\n", socdev);
      dev_dbg(&pdev->dev, "codec_data=%p\n", socdev->codec_data);

      /* Fetch the relevant aic26 private data here (it's already been
       * stored in the .codec pointer) */
      aic26 = socdev->codec_data;
      if (aic26 == NULL) {
            dev_err(&pdev->dev, "aic26: missing codec pointer\n");
            return -ENODEV;
      }
      codec = &aic26->codec;
      socdev->card->codec = codec;

      dev_dbg(&pdev->dev, "Registering PCMs, dev=%p, socdev->dev=%p\n",
            &pdev->dev, socdev->dev);
      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(&pdev->dev, "aic26: failed to create pcms\n");
            return -ENODEV;
      }

      /* register controls */
      dev_dbg(&pdev->dev, "Registering controls\n");
      err = snd_soc_add_controls(codec, aic26_snd_controls,
                  ARRAY_SIZE(aic26_snd_controls));
      WARN_ON(err < 0);

      return 0;
}

static int aic26_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      snd_soc_free_pcms(socdev);
      return 0;
}

struct snd_soc_codec_device aic26_soc_codec_dev = {
      .probe = aic26_probe,
      .remove = aic26_remove,
};
EXPORT_SYMBOL_GPL(aic26_soc_codec_dev);

/* ---------------------------------------------------------------------
 * SPI device portion of driver: sysfs files for debugging
 */

static ssize_t aic26_keyclick_show(struct device *dev,
                           struct device_attribute *attr, char *buf)
{
      struct aic26 *aic26 = dev_get_drvdata(dev);
      int val, amp, freq, len;

      val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
      amp = (val >> 12) & 0x7;
      freq = (125 << ((val >> 8) & 0x7)) >> 1;
      len = 2 * (1 + ((val >> 4) & 0xf));

      return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
}

/* Any write to the keyclick attribute will trigger the keyclick event */
static ssize_t aic26_keyclick_set(struct device *dev,
                          struct device_attribute *attr,
                          const char *buf, size_t count)
{
      struct aic26 *aic26 = dev_get_drvdata(dev);
      int val;

      val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
      val |= 0x8000;
      aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);

      return count;
}

static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);

/* ---------------------------------------------------------------------
 * SPI device portion of driver: probe and release routines and SPI
 *                       driver registration.
 */
static int aic26_spi_probe(struct spi_device *spi)
{
      struct aic26 *aic26;
      int ret, i, reg;

      dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");

      /* Allocate driver data */
      aic26 = kzalloc(sizeof *aic26, GFP_KERNEL);
      if (!aic26)
            return -ENOMEM;

      /* Initialize the driver data */
      aic26->spi = spi;
      dev_set_drvdata(&spi->dev, aic26);

      /* Setup what we can in the codec structure so that the register
       * access functions will work as expected.  More will be filled
       * out when it is probed by the SoC CODEC part of this driver */
      aic26->codec.private_data = aic26;
      aic26->codec.name = "aic26";
      aic26->codec.owner = THIS_MODULE;
      aic26->codec.dai = &aic26_dai;
      aic26->codec.num_dai = 1;
      aic26->codec.read = aic26_reg_read;
      aic26->codec.write = aic26_reg_write;
      aic26->master = 1;
      mutex_init(&aic26->codec.mutex);
      INIT_LIST_HEAD(&aic26->codec.dapm_widgets);
      INIT_LIST_HEAD(&aic26->codec.dapm_paths);
      aic26->codec.reg_cache_size = AIC26_NUM_REGS;
      aic26->codec.reg_cache = aic26->reg_cache;

      aic26_dai.dev = &spi->dev;
      ret = snd_soc_register_dai(&aic26_dai);
      if (ret != 0) {
            dev_err(&spi->dev, "Failed to register DAI: %d\n", ret);
            kfree(aic26);
            return ret;
      }

      /* Reset the codec to power on defaults */
      aic26_reg_write(&aic26->codec, AIC26_REG_RESET, 0xBB00);

      /* Power up CODEC */
      aic26_reg_write(&aic26->codec, AIC26_REG_POWER_CTRL, 0);

      /* Audio Control 3 (master mode, fsref rate) */
      reg = aic26_reg_read(&aic26->codec, AIC26_REG_AUDIO_CTRL3);
      reg &= ~0xf800;
      reg |= 0x0800; /* set master mode */
      aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL3, reg);

      /* Fill register cache */
      for (i = 0; i < ARRAY_SIZE(aic26->reg_cache); i++)
            aic26_reg_read(&aic26->codec, i);

      /* Register the sysfs files for debugging */
      /* Create SysFS files */
      ret = device_create_file(&spi->dev, &dev_attr_keyclick);
      if (ret)
            dev_info(&spi->dev, "error creating sysfs files\n");

#if defined(CONFIG_SND_SOC_OF_SIMPLE)
      /* Tell the of_soc helper about this codec */
      of_snd_soc_register_codec(&aic26_soc_codec_dev, aic26, &aic26_dai,
                          spi->dev.archdata.of_node);
#endif

      dev_dbg(&spi->dev, "SPI device initialized\n");
      return 0;
}

static int aic26_spi_remove(struct spi_device *spi)
{
      struct aic26 *aic26 = dev_get_drvdata(&spi->dev);

      snd_soc_unregister_dai(&aic26_dai);
      kfree(aic26);

      return 0;
}

static struct spi_driver aic26_spi = {
      .driver = {
            .name = "tlv320aic26",
            .owner = THIS_MODULE,
      },
      .probe = aic26_spi_probe,
      .remove = aic26_spi_remove,
};

static int __init aic26_init(void)
{
      return spi_register_driver(&aic26_spi);
}
module_init(aic26_init);

static void __exit aic26_exit(void)
{
      spi_unregister_driver(&aic26_spi);
}
module_exit(aic26_exit);

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