imote2.c

Go to the documentation of this file.

#include <linux/module.h>
#include <sound/soc.h>

#include <asm/mach-types.h>

#include "../codecs/wm8940.h"
#include "pxa2xx-i2s.h"

static int imote2_asoc_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;
    unsigned int clk = 0;
    int ret;

    switch (params_rate(params)) {
    case 8000:
    case 16000:
    case 48000:
    case 96000:
        clk = 12288000;
        break;
    case 11025:
    case 22050:
    case 44100:
        clk = 11289600;
        break;
    }

    ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
                     SND_SOC_CLOCK_IN);
    if (ret < 0)
        return ret;

    /* set the I2S system clock as input (unused) */
    ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, clk,
        SND_SOC_CLOCK_OUT);

    return ret;
}

static struct snd_soc_ops imote2_asoc_ops = {
    .hw_params = imote2_asoc_hw_params,
};

static struct snd_soc_dai_link imote2_dai = {
    .name = "WM8940",
    .stream_name = "WM8940",
    .cpu_dai_name = "pxa2xx-i2s",
    .codec_dai_name = "wm8940-hifi",
    .platform_name = "pxa-pcm-audio",
    .codec_name = "wm8940-codec.0-0034",
    .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
           SND_SOC_DAIFMT_CBS_CFS,
    .ops = &imote2_asoc_ops,
};

static struct snd_soc_card imote2 = {
    .name = "Imote2",
    .owner = THIS_MODULE,
    .dai_link = &imote2_dai,
    .num_links = 1,
};

static int __devinit imote2_probe(struct platform_device *pdev)
{
    struct snd_soc_card *card = &imote2;
    int 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);
    return ret;
}

static int __devexit imote2_remove(struct platform_device *pdev)
{
    struct snd_soc_card *card = platform_get_drvdata(pdev);

    snd_soc_unregister_card(card);
    return 0;
}

static struct platform_driver imote2_driver = {
    .driver     = {
        .name   = "imote2-audio",
        .owner  = THIS_MODULE,
    },
    .probe      = imote2_probe,
    .remove     = __devexit_p(imote2_remove),
};

module_platform_driver(imote2_driver);

MODULE_AUTHOR("Jonathan Cameron");
MODULE_DESCRIPTION("ALSA SoC Imote 2");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imote2-audio");