1. 根目录:
2. sound
3. soc
4. codecs
5. dmic.c

/*
 * dmic.c  --  SoC audio for Generic Digital MICs
 *
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

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

static struct snd_soc_dai_driver dmic_dai = {
	.name = "dmic-hifi",
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 8,
		.rates = SNDRV_PCM_RATE_CONTINUOUS,
		.formats = SNDRV_PCM_FMTBIT_S32_LE
			| SNDRV_PCM_FMTBIT_S24_LE
			| SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
			     SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_INPUT("DMic"),
};

static const struct snd_soc_dapm_route intercon[] = {
	{"DMIC AIF", NULL, "DMic"},
};

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

	snd_soc_dapm_new_controls(dapm, dmic_dapm_widgets,
				  ARRAY_SIZE(dmic_dapm_widgets));
        snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
	snd_soc_dapm_new_widgets(dapm);

	return 0;
}

static struct snd_soc_codec_driver soc_dmic = {
	.probe	= dmic_probe,
};

static int dmic_dev_probe(struct platform_device *pdev)
{
	return snd_soc_register_codec(&pdev->dev,
			&soc_dmic, &dmic_dai, 1);
}

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

MODULE_ALIAS("platform:dmic-codec");

static struct platform_driver dmic_driver = {
	.driver = {
		.name = "dmic-codec",
		.owner = THIS_MODULE,
	},
	.probe = dmic_dev_probe,
	.remove = dmic_dev_remove,
};

module_platform_driver(dmic_driver);

MODULE_DESCRIPTION("Generic DMIC driver");
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_LICENSE("GPL");