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cx20442.c

/*
 * cx20442.c  --  CX20442 ALSA Soc Audio driver
 *
 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
 *
 * Initially based on sound/soc/codecs/wm8400.c
 * Copyright 2008, 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 as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/tty.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/soc-dapm.h>

#include "cx20442.h"


struct cx20442_priv {
      struct snd_soc_codec codec;
      u8 reg_cache[1];
};

#define CX20442_PM            0x0

#define CX20442_TELIN         0
#define CX20442_TELOUT        1
#define CX20442_MIC           2
#define CX20442_SPKOUT        3
#define CX20442_AGC           4

static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
      SND_SOC_DAPM_OUTPUT("TELOUT"),
      SND_SOC_DAPM_OUTPUT("SPKOUT"),
      SND_SOC_DAPM_OUTPUT("AGCOUT"),

      SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),

      SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
      SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
      SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),

      SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
      SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),

      SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),

      SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
      SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),

      SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),

      SND_SOC_DAPM_INPUT("TELIN"),
      SND_SOC_DAPM_INPUT("MIC"),
      SND_SOC_DAPM_INPUT("AGCIN"),
};

static const struct snd_soc_dapm_route cx20442_audio_map[] = {
      {"TELOUT", NULL, "TELOUT Amp"},

      {"SPKOUT", NULL, "SPKOUT Mixer"},
      {"SPKOUT Mixer", NULL, "SPKOUT Amp"},

      {"TELOUT Amp", NULL, "DAC"},
      {"SPKOUT Amp", NULL, "DAC"},

      {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
      {"SPKOUT AGC", NULL, "AGCIN"},

      {"AGCOUT", NULL, "MIC AGC"},
      {"MIC AGC", NULL, "MIC"},

      {"MIC Bias", NULL, "MIC"},
      {"Input Mixer", NULL, "MIC Bias"},

      {"TELIN Bias", NULL, "TELIN"},
      {"Input Mixer", NULL, "TELIN Bias"},

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

static int cx20442_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
                          ARRAY_SIZE(cx20442_dapm_widgets));

      snd_soc_dapm_add_routes(codec, cx20442_audio_map,
                        ARRAY_SIZE(cx20442_audio_map));

      snd_soc_dapm_new_widgets(codec);
      return 0;
}

static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
                                          unsigned int reg)
{
      u8 *reg_cache = codec->reg_cache;

      if (reg >= codec->reg_cache_size)
            return -EINVAL;

      return reg_cache[reg];
}

enum v253_vls {
      V253_VLS_NONE = 0,
      V253_VLS_T,
      V253_VLS_L,
      V253_VLS_LT,
      V253_VLS_S,
      V253_VLS_ST,
      V253_VLS_M,
      V253_VLS_MST,
      V253_VLS_S1,
      V253_VLS_S1T,
      V253_VLS_MS1T,
      V253_VLS_M1,
      V253_VLS_M1ST,
      V253_VLS_M1S1T,
      V253_VLS_H,
      V253_VLS_HT,
      V253_VLS_MS,
      V253_VLS_MS1,
      V253_VLS_M1S,
      V253_VLS_M1S1,
      V253_VLS_TEST,
};

static int cx20442_pm_to_v253_vls(u8 value)
{
      switch (value & ~(1 << CX20442_AGC)) {
      case 0:
            return V253_VLS_T;
      case (1 << CX20442_SPKOUT):
      case (1 << CX20442_MIC):
      case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
            return V253_VLS_M1S1;
      case (1 << CX20442_TELOUT):
      case (1 << CX20442_TELIN):
      case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
            return V253_VLS_L;
      case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
            return V253_VLS_NONE;
      }
      return -EINVAL;
}
static int cx20442_pm_to_v253_vsp(u8 value)
{
      switch (value & ~(1 << CX20442_AGC)) {
      case (1 << CX20442_SPKOUT):
      case (1 << CX20442_MIC):
      case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
            return (bool)(value & (1 << CX20442_AGC));
      }
      return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
}

static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
                                          unsigned int value)
{
      u8 *reg_cache = codec->reg_cache;
      int vls, vsp, old, len;
      char buf[18];

      if (reg >= codec->reg_cache_size)
            return -EINVAL;

      /* hw_write and control_data pointers required for talking to the modem
       * are expected to be set by the line discipline initialization code */
      if (!codec->hw_write || !codec->control_data)
            return -EIO;

      old = reg_cache[reg];
      reg_cache[reg] = value;

      vls = cx20442_pm_to_v253_vls(value);
      if (vls < 0)
            return vls;

      vsp = cx20442_pm_to_v253_vsp(value);
      if (vsp < 0)
            return vsp;

      if ((vls == V253_VLS_T) ||
                  (vls == cx20442_pm_to_v253_vls(old))) {
            if (vsp == cx20442_pm_to_v253_vsp(old))
                  return 0;
            len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
      } else if (vsp == cx20442_pm_to_v253_vsp(old))
            len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
      else
            len = snprintf(buf, ARRAY_SIZE(buf),
                              "at+vls=%d;+vsp=%d\r", vls, vsp);

      if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
            return -ENOMEM;

      dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
      if (codec->hw_write(codec->control_data, buf, len) != len)
            return -EIO;

      return 0;
}


/* Moved up here as line discipline referres it during initialization */
static struct snd_soc_codec *cx20442_codec;


/*
 * Line discpline related code
 *
 * Any of the callback functions below can be used in two ways:
 * 1) registerd by a machine driver as one of line discipline operations,
 * 2) called from a machine's provided line discipline callback function
 *    in case when extra machine specific code must be run as well.
 */

/* Modem init: echo off, digital speaker off, quiet off, voice mode */
static const char *v253_init = "ate0m0q0+fclass=8\r";

/* Line discipline .open() */
static int v253_open(struct tty_struct *tty)
{
      struct snd_soc_codec *codec = cx20442_codec;
      int ret, len = strlen(v253_init);

      /* Doesn't make sense without write callback */
      if (!tty->ops->write)
            return -EINVAL;

      /* Pass the codec structure address for use by other ldisc callbacks */
      tty->disc_data = codec;

      if (tty->ops->write(tty, v253_init, len) != len) {
            ret = -EIO;
            goto err;
      }
      /* Actual setup will be performed after the modem responds. */
      return 0;
err:
      tty->disc_data = NULL;
      return ret;
}

/* Line discipline .close() */
static void v253_close(struct tty_struct *tty)
{
      struct snd_soc_codec *codec = tty->disc_data;

      tty->disc_data = NULL;

      if (!codec)
            return;

      /* Prevent the codec driver from further accessing the modem */
      codec->hw_write = NULL;
      codec->control_data = NULL;
      codec->pop_time = 0;
}

/* Line discipline .hangup() */
static int v253_hangup(struct tty_struct *tty)
{
      v253_close(tty);
      return 0;
}

/* Line discipline .receive_buf() */
static void v253_receive(struct tty_struct *tty,
                        const unsigned char *cp, char *fp, int count)
{
      struct snd_soc_codec *codec = tty->disc_data;

      if (!codec)
            return;

      if (!codec->control_data) {
            /* First modem response, complete setup procedure */

            /* Set up codec driver access to modem controls */
            codec->control_data = tty;
            codec->hw_write = (hw_write_t)tty->ops->write;
            codec->pop_time = 1;
      }
}

/* Line discipline .write_wakeup() */
static void v253_wakeup(struct tty_struct *tty)
{
}

struct tty_ldisc_ops v253_ops = {
      .magic = TTY_LDISC_MAGIC,
      .name = "cx20442",
      .owner = THIS_MODULE,
      .open = v253_open,
      .close = v253_close,
      .hangup = v253_hangup,
      .receive_buf = v253_receive,
      .write_wakeup = v253_wakeup,
};
EXPORT_SYMBOL_GPL(v253_ops);


/*
 * Codec DAI
 */

struct snd_soc_dai cx20442_dai = {
      .name = "CX20442",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 1,
            .rates = SNDRV_PCM_RATE_8000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 1,
            .rates = SNDRV_PCM_RATE_8000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,
      },
};
EXPORT_SYMBOL_GPL(cx20442_dai);

static int cx20442_codec_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret;

      if (!cx20442_codec) {
            dev_err(&pdev->dev, "cx20442 not yet discovered\n");
            return -ENODEV;
      }
      codec = cx20442_codec;

      socdev->card->codec = codec;

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

      cx20442_add_widgets(codec);

      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            dev_err(&pdev->dev, "failed to register card\n");
            goto card_err;
      }

      return ret;

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

/* power down chip */
static int cx20442_codec_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 cx20442_codec_dev = {
      .probe =    cx20442_codec_probe,
      .remove =   cx20442_codec_remove,
};
EXPORT_SYMBOL_GPL(cx20442_codec_dev);

static int cx20442_register(struct cx20442_priv *cx20442)
{
      struct snd_soc_codec *codec = &cx20442->codec;
      int ret;

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

      codec->name = "CX20442";
      codec->owner = THIS_MODULE;
      codec->private_data = cx20442;

      codec->dai = &cx20442_dai;
      codec->num_dai = 1;

      codec->reg_cache = &cx20442->reg_cache;
      codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
      codec->read = cx20442_read_reg_cache;
      codec->write = cx20442_write;

      codec->bias_level = SND_SOC_BIAS_OFF;

      cx20442_dai.dev = codec->dev;

      cx20442_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(&cx20442_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:
      cx20442_codec = NULL;
      kfree(cx20442);
      return ret;
}

static void cx20442_unregister(struct cx20442_priv *cx20442)
{
      snd_soc_unregister_dai(&cx20442_dai);
      snd_soc_unregister_codec(&cx20442->codec);

      cx20442_codec = NULL;
      kfree(cx20442);
}

static int cx20442_platform_probe(struct platform_device *pdev)
{
      struct cx20442_priv *cx20442;
      struct snd_soc_codec *codec;

      cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
      if (cx20442 == NULL)
            return -ENOMEM;

      codec = &cx20442->codec;

      codec->control_data = NULL;
      codec->hw_write = NULL;
      codec->pop_time = 0;

      codec->dev = &pdev->dev;
      platform_set_drvdata(pdev, cx20442);

      return cx20442_register(cx20442);
}

static int __exit cx20442_platform_remove(struct platform_device *pdev)
{
      struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);

      cx20442_unregister(cx20442);
      return 0;
}

static struct platform_driver cx20442_platform_driver = {
      .driver = {
            .name = "cx20442",
            .owner = THIS_MODULE,
            },
      .probe = cx20442_platform_probe,
      .remove = __exit_p(cx20442_platform_remove),
};

static int __init cx20442_init(void)
{
      return platform_driver_register(&cx20442_platform_driver);
}
module_init(cx20442_init);

static void __exit cx20442_exit(void)
{
      platform_driver_unregister(&cx20442_platform_driver);
}
module_exit(cx20442_exit);

MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
MODULE_AUTHOR("Janusz Krzysztofik");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:cx20442");

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