simple-card.c

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/*
 * ASoC simple sound card support
 *
 * Copyright (C) 2012 Renesas Solutions Corp.
 * Kuninori Morimoto <[email protected]>
 *
 * 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.
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/simple_card.h>

#define asoc_simple_get_card_info(p) \
    container_of(p->dai_link, struct asoc_simple_card_info, snd_link)

static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
{
    struct asoc_simple_card_info *cinfo = asoc_simple_get_card_info(rtd);
    struct asoc_simple_dai_init_info *iinfo = cinfo->init;
    struct snd_soc_dai *codec = rtd->codec_dai;
    struct snd_soc_dai *cpu = rtd->cpu_dai;
    unsigned int cpu_daifmt = iinfo->fmt | iinfo->cpu_daifmt;
    unsigned int codec_daifmt = iinfo->fmt | iinfo->codec_daifmt;
    int ret;

    if (codec_daifmt) {
        ret = snd_soc_dai_set_fmt(codec, codec_daifmt);
        if (ret < 0)
            return ret;
    }

    if (iinfo->sysclk) {
        ret = snd_soc_dai_set_sysclk(codec, 0, iinfo->sysclk, 0);
        if (ret < 0)
            return ret;
    }

    if (cpu_daifmt) {
        ret = snd_soc_dai_set_fmt(cpu, cpu_daifmt);
        if (ret < 0)
            return ret;
    }

    return 0;
}

static int asoc_simple_card_probe(struct platform_device *pdev)
{
    struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;

    if (!cinfo) {
        dev_err(&pdev->dev, "no info for asoc-simple-card\n");
        return -EINVAL;
    }

    if (!cinfo->name    ||
        !cinfo->card    ||
        !cinfo->cpu_dai ||
        !cinfo->codec   ||
        !cinfo->platform    ||
        !cinfo->codec_dai) {
        dev_err(&pdev->dev, "insufficient asoc_simple_card_info settings\n");
        return -EINVAL;
    }

    /*
     * init snd_soc_dai_link
     */
    cinfo->snd_link.name        = cinfo->name;
    cinfo->snd_link.stream_name = cinfo->name;
    cinfo->snd_link.cpu_dai_name    = cinfo->cpu_dai;
    cinfo->snd_link.platform_name   = cinfo->platform;
    cinfo->snd_link.codec_name  = cinfo->codec;
    cinfo->snd_link.codec_dai_name  = cinfo->codec_dai;

    /* enable snd_link.init if cinfo has settings */
    if (cinfo->init)
        cinfo->snd_link.init    = asoc_simple_card_dai_init;

    /*
     * init snd_soc_card
     */
    cinfo->snd_card.name        = cinfo->card;
    cinfo->snd_card.owner       = THIS_MODULE;
    cinfo->snd_card.dai_link    = &cinfo->snd_link;
    cinfo->snd_card.num_links   = 1;
    cinfo->snd_card.dev     = &pdev->dev;

    return snd_soc_register_card(&cinfo->snd_card);
}

static int asoc_simple_card_remove(struct platform_device *pdev)
{
    struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;

    return snd_soc_unregister_card(&cinfo->snd_card);
}

static struct platform_driver asoc_simple_card = {
    .driver = {
        .name   = "asoc-simple-card",
    },
    .probe      = asoc_simple_card_probe,
    .remove     = asoc_simple_card_remove,
};

module_platform_driver(asoc_simple_card);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ASoC Simple Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <[email protected]>");