am3517evm.c

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/*
 * am3517evm.c  -- ALSA SoC support for OMAP3517 / AM3517 EVM
 *
 * Author: Anuj Aggarwal <[email protected]>
 *
 * Based on sound/soc/omap/beagle.c by Steve Sakoman
 *
 * Copyright (C) 2009 Texas Instruments Incorporated
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/gpio.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"

#include "../codecs/tlv320aic23.h"

#define CODEC_CLOCK     12000000

static int am3517evm_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;
    int ret;

    /* Set the codec system clock for DAC and ADC */
    ret = snd_soc_dai_set_sysclk(codec_dai, 0,
            CODEC_CLOCK, SND_SOC_CLOCK_IN);
    if (ret < 0)
        printk(KERN_ERR "can't set codec system clock\n");

    return ret;
}

static struct snd_soc_ops am3517evm_ops = {
    .hw_params = am3517evm_hw_params,
};

/* am3517evm machine dapm widgets */
static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
    SND_SOC_DAPM_HP("Line Out", NULL),
    SND_SOC_DAPM_LINE("Line In", NULL),
    SND_SOC_DAPM_MIC("Mic In", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
    /* Line Out connected to LLOUT, RLOUT */
    {"Line Out", NULL, "LOUT"},
    {"Line Out", NULL, "ROUT"},

    {"LLINEIN", NULL, "Line In"},
    {"RLINEIN", NULL, "Line In"},

    {"MICIN", NULL, "Mic In"},
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link am3517evm_dai = {
    .name = "TLV320AIC23",
    .stream_name = "AIC23",
    .cpu_dai_name = "omap-mcbsp.1",
    .codec_dai_name = "tlv320aic23-hifi",
    .platform_name = "omap-pcm-audio",
    .codec_name = "tlv320aic23-codec.2-001a",
    .dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF |
           SND_SOC_DAIFMT_CBM_CFM,
    .ops = &am3517evm_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_am3517evm = {
    .name = "am3517evm",
    .owner = THIS_MODULE,
    .dai_link = &am3517evm_dai,
    .num_links = 1,

    .dapm_widgets = tlv320aic23_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(tlv320aic23_dapm_widgets),
    .dapm_routes = audio_map,
    .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static struct platform_device *am3517evm_snd_device;

static int __init am3517evm_soc_init(void)
{
    int ret;

    if (!machine_is_omap3517evm())
        return -ENODEV;
    pr_info("OMAP3517 / AM3517 EVM SoC init\n");

    am3517evm_snd_device = platform_device_alloc("soc-audio", -1);
    if (!am3517evm_snd_device) {
        printk(KERN_ERR "Platform device allocation failed\n");
        return -ENOMEM;
    }

    platform_set_drvdata(am3517evm_snd_device, &snd_soc_am3517evm);

    ret = platform_device_add(am3517evm_snd_device);
    if (ret)
        goto err1;

    return 0;

err1:
    printk(KERN_ERR "Unable to add platform device\n");
    platform_device_put(am3517evm_snd_device);

    return ret;
}

static void __exit am3517evm_soc_exit(void)
{
    platform_device_unregister(am3517evm_snd_device);
}

module_init(am3517evm_soc_init);
module_exit(am3517evm_soc_exit);

MODULE_AUTHOR("Anuj Aggarwal <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC OMAP3517 / AM3517 EVM");
MODULE_LICENSE("GPL v2");