Logo Search packages:      
Sourcecode: alsa-driver version File versions

ak4642.c

/*
 * ak4642.c  --  AK4642/AK4643 ALSA Soc Audio driver
 *
 * Copyright (C) 2009 Renesas Solutions Corp.
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * Based on wm8731.c by Richard Purdie
 * Based on ak4535.c by Richard Purdie
 * Based on wm8753.c by Liam Girdwood
 *
 * 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.
 */

/* ** CAUTION **
 *
 * This is very simple driver.
 * It can use headphone output / stereo input only
 *
 * AK4642 is not tested.
 * AK4643 is tested.
 */

#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 <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 "ak4642.h"

#define AK4642_VERSION "0.0.1"

#define PW_MGMT1  0x00
#define PW_MGMT2  0x01
#define SG_SL1          0x02
#define SG_SL2          0x03
#define MD_CTL1         0x04
#define MD_CTL2         0x05
#define TIMER           0x06
#define ALC_CTL1  0x07
#define ALC_CTL2  0x08
#define L_IVC           0x09
#define L_DVC           0x0a
#define ALC_CTL3  0x0b
#define R_IVC           0x0c
#define R_DVC           0x0d
#define MD_CTL3         0x0e
#define MD_CTL4         0x0f
#define PW_MGMT3  0x10
#define DF_S            0x11
#define FIL3_0          0x12
#define FIL3_1          0x13
#define FIL3_2          0x14
#define FIL3_3          0x15
#define EQ_0            0x16
#define EQ_1            0x17
#define EQ_2            0x18
#define EQ_3            0x19
#define EQ_4            0x1a
#define EQ_5            0x1b
#define FIL1_0          0x1c
#define FIL1_1          0x1d
#define FIL1_2          0x1e
#define FIL1_3          0x1f
#define PW_MGMT4  0x20
#define MD_CTL5         0x21
#define LO_MS           0x22
#define HP_MS           0x23
#define SPK_MS          0x24

#define AK4642_CACHEREGNUM    0x25

struct snd_soc_codec_device soc_codec_dev_ak4642;

/* codec private data */
struct ak4642_priv {
      struct snd_soc_codec codec;
      unsigned int sysclk;
};

static struct snd_soc_codec *ak4642_codec;

/*
 * ak4642 register cache
 */
static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
      0x0000, 0x0000, 0x0001, 0x0000,
      0x0002, 0x0000, 0x0000, 0x0000,
      0x00e1, 0x00e1, 0x0018, 0x0000,
      0x00e1, 0x0018, 0x0011, 0x0008,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0000, 0x0000, 0x0000, 0x0000,
      0x0000,
};

/*
 * read ak4642 register cache
 */
static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
      unsigned int reg)
{
      u16 *cache = codec->reg_cache;
      if (reg >= AK4642_CACHEREGNUM)
            return -1;
      return cache[reg];
}

/*
 * write ak4642 register cache
 */
static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
      u16 reg, unsigned int value)
{
      u16 *cache = codec->reg_cache;
      if (reg >= AK4642_CACHEREGNUM)
            return;

      cache[reg] = value;
}

/*
 * write to the AK4642 register space
 */
static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
      unsigned int value)
{
      u8 data[2];

      /* data is
       *   D15..D8 AK4642 register offset
       *   D7...D0 register data
       */
      data[0] = reg & 0xff;
      data[1] = value & 0xff;

      if (codec->hw_write(codec->control_data, data, 2) == 2) {
            ak4642_write_reg_cache(codec, reg, value);
            return 0;
      } else
            return -EIO;
}

static int ak4642_sync(struct snd_soc_codec *codec)
{
      u16 *cache = codec->reg_cache;
      int i, r = 0;

      for (i = 0; i < AK4642_CACHEREGNUM; i++)
            r |= ak4642_write(codec, i, cache[i]);

      return r;
};

static int ak4642_dai_startup(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
      int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
      struct snd_soc_codec *codec = dai->codec;

      if (is_play) {
            /*
             * start headphone output
             *
             * PLL, Master Mode
             * Audio I/F Format :MSB justified (ADC & DAC)
             * Sampling Frequency: 44.1kHz
             * Digital Volume: −8dB
             * Bass Boost Level : Middle
             *
             * This operation came from example code of
             * "ASAHI KASEI AK4642" (japanese) manual p97.
             *
             * Example code use 0x39, 0x79 value for 0x01 address,
             * But we need MCKO (0x02) bit now
             */
            ak4642_write(codec, 0x05, 0x27);
            ak4642_write(codec, 0x0f, 0x09);
            ak4642_write(codec, 0x0e, 0x19);
            ak4642_write(codec, 0x09, 0x91);
            ak4642_write(codec, 0x0c, 0x91);
            ak4642_write(codec, 0x0a, 0x28);
            ak4642_write(codec, 0x0d, 0x28);
            ak4642_write(codec, 0x00, 0x64);
            ak4642_write(codec, 0x01, 0x3b); /* + MCKO bit */
            ak4642_write(codec, 0x01, 0x7b); /* + MCKO bit */
      } else {
            /*
             * start stereo input
             *
             * PLL Master Mode
             * Audio I/F Format:MSB justified (ADC & DAC)
             * Sampling Frequency:44.1kHz
             * Pre MIC AMP:+20dB
             * MIC Power On
             * ALC setting:Refer to Table 35
             * ALC bit=“1”
             *
             * This operation came from example code of
             * "ASAHI KASEI AK4642" (japanese) manual p94.
             */
            ak4642_write(codec, 0x05, 0x27);
            ak4642_write(codec, 0x02, 0x05);
            ak4642_write(codec, 0x06, 0x3c);
            ak4642_write(codec, 0x08, 0xe1);
            ak4642_write(codec, 0x0b, 0x00);
            ak4642_write(codec, 0x07, 0x21);
            ak4642_write(codec, 0x00, 0x41);
            ak4642_write(codec, 0x10, 0x01);
      }

      return 0;
}

static void ak4642_dai_shutdown(struct snd_pcm_substream *substream,
                         struct snd_soc_dai *dai)
{
      int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
      struct snd_soc_codec *codec = dai->codec;

      if (is_play) {
            /* stop headphone output */
            ak4642_write(codec, 0x01, 0x3b);
            ak4642_write(codec, 0x01, 0x0b);
            ak4642_write(codec, 0x00, 0x40);
            ak4642_write(codec, 0x0e, 0x11);
            ak4642_write(codec, 0x0f, 0x08);
      } else {
            /* stop stereo input */
            ak4642_write(codec, 0x00, 0x40);
            ak4642_write(codec, 0x10, 0x00);
            ak4642_write(codec, 0x07, 0x01);
      }
}

static int ak4642_dai_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 ak4642_priv *ak4642 = codec->private_data;

      ak4642->sysclk = freq;
      return 0;
}

static struct snd_soc_dai_ops ak4642_dai_ops = {
      .startup    = ak4642_dai_startup,
      .shutdown   = ak4642_dai_shutdown,
      .set_sysclk = ak4642_dai_set_sysclk,
};

struct snd_soc_dai ak4642_dai = {
      .name = "AK4642",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE },
      .ops = &ak4642_dai_ops,
};
EXPORT_SYMBOL_GPL(ak4642_dai);

static int ak4642_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      ak4642_sync(codec);
      return 0;
}

/*
 * initialise the AK4642 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int ak4642_init(struct ak4642_priv *ak4642)
{
      struct snd_soc_codec *codec = &ak4642->codec;
      int ret = 0;

      if (ak4642_codec) {
            dev_err(codec->dev, "Another ak4642 is registered\n");
            return -EINVAL;
      }

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

      codec->private_data     = ak4642;
      codec->name       = "AK4642";
      codec->owner            = THIS_MODULE;
      codec->read       = ak4642_read_reg_cache;
      codec->write            = ak4642_write;
      codec->dai        = &ak4642_dai;
      codec->num_dai          = 1;
      codec->hw_write         = (hw_write_t)i2c_master_send;
      codec->reg_cache_size   = ARRAY_SIZE(ak4642_reg);
      codec->reg_cache  = kmemdup(ak4642_reg,
                                sizeof(ak4642_reg), GFP_KERNEL);

      if (!codec->reg_cache)
            return -ENOMEM;

      ak4642_dai.dev = codec->dev;
      ak4642_codec = codec;

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

      ret = snd_soc_register_dai(&ak4642_dai);
      if (ret) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            snd_soc_unregister_codec(codec);
            goto reg_cache_err;
      }

      /*
       * clock setting
       *
       * Audio I/F Format: MSB justified (ADC & DAC)
       * BICK frequency at Master Mode: 64fs
       * Input Master Clock Select at PLL Mode: 11.2896MHz
       * MCKO: Enable
       * Sampling Frequency: 44.1kHz
       *
       * This operation came from example code of
       * "ASAHI KASEI AK4642" (japanese) manual p89.
       *
       * please fix-me
       */
      ak4642_write(codec, 0x01, 0x08);
      ak4642_write(codec, 0x04, 0x4a);
      ak4642_write(codec, 0x05, 0x27);
      ak4642_write(codec, 0x00, 0x40);
      ak4642_write(codec, 0x01, 0x0b);

      return ret;

reg_cache_err:
      kfree(codec->reg_cache);
      codec->reg_cache = NULL;

      return ret;
}

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int ak4642_i2c_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *id)
{
      struct ak4642_priv *ak4642;
      struct snd_soc_codec *codec;
      int ret;

      ak4642 = kzalloc(sizeof(struct ak4642_priv), GFP_KERNEL);
      if (!ak4642)
            return -ENOMEM;

      codec = &ak4642->codec;
      codec->dev = &i2c->dev;

      i2c_set_clientdata(i2c, ak4642);
      codec->control_data = i2c;

      ret = ak4642_init(ak4642);
      if (ret < 0)
            printk(KERN_ERR "failed to initialise AK4642\n");

      return ret;
}

static int ak4642_i2c_remove(struct i2c_client *client)
{
      struct ak4642_priv *ak4642 = i2c_get_clientdata(client);

      snd_soc_unregister_dai(&ak4642_dai);
      snd_soc_unregister_codec(&ak4642->codec);
      kfree(ak4642->codec.reg_cache);
      kfree(ak4642);
      ak4642_codec = NULL;

      return 0;
}

static const struct i2c_device_id ak4642_i2c_id[] = {
      { "ak4642", 0 },
      { "ak4643", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, ak4642_i2c_id);

static struct i2c_driver ak4642_i2c_driver = {
      .driver = {
            .name = "AK4642 I2C Codec",
            .owner = THIS_MODULE,
      },
      .probe            = ak4642_i2c_probe,
      .remove           = ak4642_i2c_remove,
      .id_table   = ak4642_i2c_id,
};

#endif

static int ak4642_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      int ret;

      if (!ak4642_codec) {
            dev_err(&pdev->dev, "Codec device not registered\n");
            return -ENODEV;
      }

      socdev->card->codec = ak4642_codec;

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "ak4642: failed to create pcms\n");
            goto pcm_err;
      }

      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "ak4642: failed to register card\n");
            goto card_err;
      }

      dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
pcm_err:
      return ret;

}

/* power down chip */
static int ak4642_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_ak4642 = {
      .probe =    ak4642_probe,
      .remove =   ak4642_remove,
      .resume =   ak4642_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ak4642);

static int __init ak4642_modinit(void)
{
      int ret;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      ret = i2c_add_driver(&ak4642_i2c_driver);
#endif
      return ret;

}
module_init(ak4642_modinit);

static void __exit ak4642_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
      i2c_del_driver(&ak4642_i2c_driver);
#endif

}
module_exit(ak4642_exit);

MODULE_DESCRIPTION("Soc AK4642 driver");
MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index