1. 根目录:
2. sound
3. soc
4. ep93xx
5. snappercl15.c

/*
 * snappercl15.c -- SoC audio for Bluewater Systems Snapper CL15 module
 *
 * Copyright (C) 2008 Bluewater Systems Ltd
 * Author: Ryan Mallon <ryan@bluewatersys.com>
 *
 *  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 <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_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
				  SND_SOC_DAIFMT_NB_IF |
				  SND_SOC_DAIFMT_CBS_CFS);

	err = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | 
				  SND_SOC_DAIFMT_NB_IF |		  
				  SND_SOC_DAIFMT_CBS_CFS);
	if (err)
		return 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,
	.ops		= &snappercl15_ops,
};

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

static struct platform_device *snappercl15_snd_device;

static int __init snappercl15_init(void)
{
	int ret;

	if (!machine_is_snapper_cl15())
		return -ENODEV;

	ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
				 EP93XX_SYSCON_I2SCLKDIV_ORIDE |
				 EP93XX_SYSCON_I2SCLKDIV_SPOL);
	if (ret)
		return ret;

	snappercl15_snd_device = platform_device_alloc("soc-audio", -1);
	if (!snappercl15_snd_device)
		return -ENOMEM;
	
	platform_set_drvdata(snappercl15_snd_device, &snd_soc_snappercl15);
	ret = platform_device_add(snappercl15_snd_device);
	if (ret)
		platform_device_put(snappercl15_snd_device);

	return ret;
}

static void __exit snappercl15_exit(void)
{
	platform_device_unregister(snappercl15_snd_device);
	ep93xx_i2s_release();
}

module_init(snappercl15_init);
module_exit(snappercl15_exit);

MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
MODULE_DESCRIPTION("ALSA SoC Snapper CL15");
MODULE_LICENSE("GPL");