pcm3008.c

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/*
 * 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 <linux/slab.h>
#include <linux/module.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)

static struct snd_soc_dai_driver 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,
    },
};

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 snd_soc_codec *codec)
{
    struct pcm3008_setup_data *setup = codec->dev->platform_data;
    int ret = 0;

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

    /* 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);

    return ret;
}

static int pcm3008_soc_remove(struct snd_soc_codec *codec)
{
    struct pcm3008_setup_data *setup = codec->dev->platform_data;

    pcm3008_gpio_free(setup);
    return 0;
}

#ifdef CONFIG_PM
static int pcm3008_soc_suspend(struct snd_soc_codec *codec)
{
    struct pcm3008_setup_data *setup = codec->dev->platform_data;

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

    return 0;
}

static int pcm3008_soc_resume(struct snd_soc_codec *codec)
{
    struct pcm3008_setup_data *setup = codec->dev->platform_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

static struct snd_soc_codec_driver soc_codec_dev_pcm3008 = {
    .probe =    pcm3008_soc_probe,
    .remove =   pcm3008_soc_remove,
    .suspend =  pcm3008_soc_suspend,
    .resume =   pcm3008_soc_resume,
};

static int __devinit pcm3008_codec_probe(struct platform_device *pdev)
{
    return snd_soc_register_codec(&pdev->dev,
            &soc_codec_dev_pcm3008, &pcm3008_dai, 1);
}

static int __devexit pcm3008_codec_remove(struct platform_device *pdev)
{
    snd_soc_unregister_codec(&pdev->dev);
    return 0;
}

MODULE_ALIAS("platform:pcm3008-codec");

static struct platform_driver pcm3008_codec_driver = {
    .probe      = pcm3008_codec_probe,
    .remove     = __devexit_p(pcm3008_codec_remove),
    .driver     = {
        .name   = "pcm3008-codec",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(pcm3008_codec_driver);

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