音频单板代码解析smdk2443_wm9710.c

#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include "../codecs/ac97.h"
#include "s3c24xx-pcm.h"
#include "s3c24xx-ac97.h"

static struct snd_soc_card smdk2443;
/*将平台和codec    dai连到单板上*/
static struct snd_soc_dai_link smdk2443_dai[] = {
{
 .name = "AC97",
 .stream_name = "AC97 HiFi",
 .cpu_dai = &s3c2443_ac97_dai[0],
 .codec_dai = &ac97_dai,
},
};
/*建立snd_soc_card   与上面的单板相绑定*/
static struct snd_soc_card smdk2443 = {
 .name = "SMDK2443",
 .platform = &s3c24xx_soc_platform,
 .dai_link = smdk2443_dai,
 .num_links = ARRAY_SIZE(smdk2443_dai),
};

static struct snd_soc_device smdk2443_snd_ac97_devdata = {
 .card = &smdk2443,
 .codec_dev = &soc_codec_dev_ac97,
};

static struct platform_device *smdk2443_snd_ac97_device;

static int __init smdk2443_init(void)
{
 int ret;

 smdk2443_snd_ac97_device = platform_device_alloc("soc-audio", -1);//申请平台设备
 if (!smdk2443_snd_ac97_device)
  return -ENOMEM;

 platform_set_drvdata(smdk2443_snd_ac97_device,
    &smdk2443_snd_ac97_devdata);
 smdk2443_snd_ac97_devdata.dev = &smdk2443_snd_ac97_device->dev;
 ret = platform_device_add(smdk2443_snd_ac97_device);

 if (ret)
  platform_device_put(smdk2443_snd_ac97_device);

 return ret;
}

static void __exit smdk2443_exit(void)
{
 platform_device_unregister(smdk2443_snd_ac97_device);
}

module_init(smdk2443_init);
module_exit(smdk2443_exit);

/* Module information */
MODULE_AUTHOR("Graeme Gregory, [email protected], www.wolfsonmicro.com");
MODULE_DESCRIPTION("ALSA SoC WM9710 SMDK2443");
MODULE_LICENSE("GPL");