snappercl15.c

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/*
 * snappercl15.c -- SoC audio for Bluewater Systems Snapper CL15 module
 *
 * Copyright (C) 2008 Bluewater Systems Ltd
 * Author: Ryan Mallon
 *
 *  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/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>

#include "../codecs/tlv320aic23.h"
#include "ep93xx-pcm.h"

#define CODEC_CLOCK 5644800

static int snappercl15_hw_params(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_dai *codec_dai = rtd->codec_dai;
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    int err;

    err = snd_soc_dai_set_sysclk(codec_dai, 0, CODEC_CLOCK, 
                     SND_SOC_CLOCK_IN);
    if (err)
        return err;

    err = snd_soc_dai_set_sysclk(cpu_dai, 0, CODEC_CLOCK, 
                     SND_SOC_CLOCK_OUT);
    if (err)
        return err;

    return 0;
}

static struct snd_soc_ops snappercl15_ops = {
    .hw_params  = snappercl15_hw_params,
};

static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
    SND_SOC_DAPM_HP("Headphone Jack", NULL),
    SND_SOC_DAPM_LINE("Line In", NULL),
    SND_SOC_DAPM_MIC("Mic Jack", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
    {"Headphone Jack", NULL, "LHPOUT"},
    {"Headphone Jack", NULL, "RHPOUT"},

    {"LLINEIN", NULL, "Line In"},
    {"RLINEIN", NULL, "Line In"},

    {"MICIN", NULL, "Mic Jack"},
};

static int snappercl15_tlv320aic23_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;

    snd_soc_dapm_new_controls(dapm, tlv320aic23_dapm_widgets,
                  ARRAY_SIZE(tlv320aic23_dapm_widgets));

    snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
    return 0;
}

static struct snd_soc_dai_link snappercl15_dai = {
    .name       = "tlv320aic23",
    .stream_name    = "AIC23",
    .cpu_dai_name   = "ep93xx-i2s",
    .codec_dai_name = "tlv320aic23-hifi",
    .codec_name = "tlv320aic23-codec.0-001a",
    .platform_name  =  "ep93xx-pcm-audio",
    .init       = snappercl15_tlv320aic23_init,
    .dai_fmt    = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
              SND_SOC_DAIFMT_CBS_CFS,
    .ops        = &snappercl15_ops,
};

static struct snd_soc_card snd_soc_snappercl15 = {
    .name       = "Snapper CL15",
    .owner      = THIS_MODULE,
    .dai_link   = &snappercl15_dai,
    .num_links  = 1,
};

static int __devinit snappercl15_probe(struct platform_device *pdev)
{
    struct snd_soc_card *card = &snd_soc_snappercl15;
    int ret;

    ret = ep93xx_i2s_acquire();
    if (ret)
        return ret;

    card->dev = &pdev->dev;

    ret = snd_soc_register_card(card);
    if (ret) {
        dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
            ret);
        ep93xx_i2s_release();
    }

    return ret;
}

static int __devexit snappercl15_remove(struct platform_device *pdev)
{
    struct snd_soc_card *card = platform_get_drvdata(pdev);

    snd_soc_unregister_card(card);
    ep93xx_i2s_release();

    return 0;
}

static struct platform_driver snappercl15_driver = {
    .driver     = {
        .name   = "snappercl15-audio",
        .owner  = THIS_MODULE,
    },
    .probe      = snappercl15_probe,
    .remove     = __devexit_p(snappercl15_remove),
};

module_platform_driver(snappercl15_driver);

MODULE_AUTHOR("Ryan Mallon");
MODULE_DESCRIPTION("ALSA SoC Snapper CL15");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:snappercl15-audio");