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pcm3008.c

/*
 * ALSA Soc PCM3008 codec support
 *
 * Author:  Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on AC97 Soc codec, original copyright follow:
 * Copyright 2005 Wolfson Microelectronics PLC.
 *
 *  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.
 *
 * Generic PCM3008 support.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "pcm3008.h"

#define PCM3008_VERSION "0.2"

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
                   SNDRV_PCM_RATE_48000)

struct snd_soc_dai pcm3008_dai = {
      .name = "PCM3008 HiFi",
      .playback = {
            .stream_name = "PCM3008 Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = PCM3008_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,
      },
      .capture = {
            .stream_name = "PCM3008 Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = PCM3008_RATES,
            .formats = SNDRV_PCM_FMTBIT_S16_LE,
      },
};
EXPORT_SYMBOL_GPL(pcm3008_dai);

static void pcm3008_gpio_free(struct pcm3008_setup_data *setup)
{
      gpio_free(setup->dem0_pin);
      gpio_free(setup->dem1_pin);
      gpio_free(setup->pdad_pin);
      gpio_free(setup->pdda_pin);
}

static int pcm3008_soc_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      struct pcm3008_setup_data *setup = socdev->codec_data;
      int ret = 0;

      printk(KERN_INFO "PCM3008 SoC Audio Codec %s\n", PCM3008_VERSION);

      socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
      if (!socdev->card->codec)
            return -ENOMEM;

      codec = socdev->card->codec;
      mutex_init(&codec->mutex);

      codec->name = "PCM3008";
      codec->owner = THIS_MODULE;
      codec->dai = &pcm3008_dai;
      codec->num_dai = 1;
      codec->write = NULL;
      codec->read = NULL;
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      /* Register PCMs. */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            printk(KERN_ERR "pcm3008: failed to create pcms\n");
            goto pcm_err;
      }

      /* Register Card. */
      ret = snd_soc_init_card(socdev);
      if (ret < 0) {
            printk(KERN_ERR "pcm3008: failed to register card\n");
            goto card_err;
      }

      /* DEM1  DEM0  DE-EMPHASIS_MODE
       * Low   Low   De-emphasis 44.1 kHz ON
       * Low   High  De-emphasis OFF
       * High  Low   De-emphasis 48 kHz ON
       * High  High  De-emphasis 32 kHz ON
       */

      /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
      ret = gpio_request(setup->dem0_pin, "codec_dem0");
      if (ret == 0)
            ret = gpio_direction_output(setup->dem0_pin, 1);
      if (ret != 0)
            goto gpio_err;

      /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
      ret = gpio_request(setup->dem1_pin, "codec_dem1");
      if (ret == 0)
            ret = gpio_direction_output(setup->dem1_pin, 0);
      if (ret != 0)
            goto gpio_err;

      /* Configure PDAD GPIO. */
      ret = gpio_request(setup->pdad_pin, "codec_pdad");
      if (ret == 0)
            ret = gpio_direction_output(setup->pdad_pin, 1);
      if (ret != 0)
            goto gpio_err;

      /* Configure PDDA GPIO. */
      ret = gpio_request(setup->pdda_pin, "codec_pdda");
      if (ret == 0)
            ret = gpio_direction_output(setup->pdda_pin, 1);
      if (ret != 0)
            goto gpio_err;

      return ret;

gpio_err:
      pcm3008_gpio_free(setup);
card_err:
      snd_soc_free_pcms(socdev);
pcm_err:
      kfree(socdev->card->codec);

      return ret;
}

static int pcm3008_soc_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;
      struct pcm3008_setup_data *setup = socdev->codec_data;

      if (!codec)
            return 0;

      pcm3008_gpio_free(setup);
      snd_soc_free_pcms(socdev);
      kfree(socdev->card->codec);

      return 0;
}

#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct pcm3008_setup_data *setup = socdev->codec_data;

      gpio_set_value(setup->pdad_pin, 0);
      gpio_set_value(setup->pdda_pin, 0);

      return 0;
}

static int pcm3008_soc_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct pcm3008_setup_data *setup = socdev->codec_data;

      gpio_set_value(setup->pdad_pin, 1);
      gpio_set_value(setup->pdda_pin, 1);

      return 0;
}
#else
#define pcm3008_soc_suspend NULL
#define pcm3008_soc_resume NULL
#endif

struct snd_soc_codec_device soc_codec_dev_pcm3008 = {
      .probe =    pcm3008_soc_probe,
      .remove =   pcm3008_soc_remove,
      .suspend =  pcm3008_soc_suspend,
      .resume =   pcm3008_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_pcm3008);

static int __init pcm3008_init(void)
{
      return snd_soc_register_dai(&pcm3008_dai);
}
module_init(pcm3008_init);

static void __exit pcm3008_exit(void)
{
      snd_soc_unregister_dai(&pcm3008_dai);
}
module_exit(pcm3008_exit);

MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");

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