root/sound/soc/davinci/davinci-evm.c

DEFINITIONS

1. evm_hw_params
2. evm_aic3x_init
3. evm_init
4. evm_exit

/*
 * ASoC driver for TI DAVINCI EVM platform
 *
 * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
 *
 * 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.
 */

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

#include <asm/dma.h>
#include <mach/hardware.h>

#include "../codecs/tlv320aic3x.h"
#include "davinci-pcm.h"
#include "davinci-i2s.h"

#define EVM_CODEC_CLOCK 22579200

static int evm_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->dai->codec_dai;
        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
        int ret = 0;

        /* set codec DAI configuration */
        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
                                         SND_SOC_DAIFMT_CBM_CFM);
        if (ret < 0)
                return ret;

        /* set cpu DAI configuration */
        ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_CBM_CFM |
                                       SND_SOC_DAIFMT_IB_NF);
        if (ret < 0)
                return ret;

        /* set the codec system clock */
        ret = snd_soc_dai_set_sysclk(codec_dai, 0, EVM_CODEC_CLOCK,
                                            SND_SOC_CLOCK_OUT);
        if (ret < 0)
                return ret;

        return 0;
}

static struct snd_soc_ops evm_ops = {
        .hw_params = evm_hw_params,
};

/* davinci-evm machine dapm widgets */
static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
        SND_SOC_DAPM_HP("Headphone Jack", NULL),
        SND_SOC_DAPM_LINE("Line Out", NULL),
        SND_SOC_DAPM_MIC("Mic Jack", NULL),
        SND_SOC_DAPM_LINE("Line In", NULL),
};

/* davinci-evm machine audio_mapnections to the codec pins */
static const struct snd_soc_dapm_route audio_map[] = {
        /* Headphone connected to HPLOUT, HPROUT */
        {"Headphone Jack", NULL, "HPLOUT"},
        {"Headphone Jack", NULL, "HPROUT"},

        /* Line Out connected to LLOUT, RLOUT */
        {"Line Out", NULL, "LLOUT"},
        {"Line Out", NULL, "RLOUT"},

        /* Mic connected to (MIC3L | MIC3R) */
        {"MIC3L", NULL, "Mic Bias 2V"},
        {"MIC3R", NULL, "Mic Bias 2V"},
        {"Mic Bias 2V", NULL, "Mic Jack"},

        /* Line In connected to (LINE1L | LINE2L), (LINE1R | LINE2R) */
        {"LINE1L", NULL, "Line In"},
        {"LINE2L", NULL, "Line In"},
        {"LINE1R", NULL, "Line In"},
        {"LINE2R", NULL, "Line In"},
};

/* Logic for a aic3x as connected on a davinci-evm */
static int evm_aic3x_init(struct snd_soc_codec *codec)
{
        /* Add davinci-evm specific widgets */
        snd_soc_dapm_new_controls(codec, aic3x_dapm_widgets,
                                  ARRAY_SIZE(aic3x_dapm_widgets));

        /* Set up davinci-evm specific audio path audio_map */
        snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

        /* not connected */
        snd_soc_dapm_disable_pin(codec, "MONO_LOUT");
        snd_soc_dapm_disable_pin(codec, "HPLCOM");
        snd_soc_dapm_disable_pin(codec, "HPRCOM");

        /* always connected */
        snd_soc_dapm_enable_pin(codec, "Headphone Jack");
        snd_soc_dapm_enable_pin(codec, "Line Out");
        snd_soc_dapm_enable_pin(codec, "Mic Jack");
        snd_soc_dapm_enable_pin(codec, "Line In");

        snd_soc_dapm_sync(codec);

        return 0;
}

/* davinci-evm digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link evm_dai = {
        .name = "TLV320AIC3X",
        .stream_name = "AIC3X",
        .cpu_dai = &davinci_i2s_dai,
        .codec_dai = &aic3x_dai,
        .init = evm_aic3x_init,
        .ops = &evm_ops,
};

/* davinci-evm audio machine driver */
static struct snd_soc_machine snd_soc_machine_evm = {
        .name = "DaVinci EVM",
        .dai_link = &evm_dai,
        .num_links = 1,
};

/* evm audio private data */
static struct aic3x_setup_data evm_aic3x_setup = {
        .i2c_bus = 0,
        .i2c_address = 0x1b,
};

/* evm audio subsystem */
static struct snd_soc_device evm_snd_devdata = {
        .machine = &snd_soc_machine_evm,
        .platform = &davinci_soc_platform,
        .codec_dev = &soc_codec_dev_aic3x,
        .codec_data = &evm_aic3x_setup,
};

static struct resource evm_snd_resources[] = {
        {
                .start = DAVINCI_MCBSP_BASE,
                .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
                .flags = IORESOURCE_MEM,
        },
};

static struct evm_snd_platform_data evm_snd_data = {
        .tx_dma_ch      = DM644X_DMACH_MCBSP_TX,
        .rx_dma_ch      = DM644X_DMACH_MCBSP_RX,
};

static struct platform_device *evm_snd_device;

static int __init evm_init(void)
{
        int ret;

        evm_snd_device = platform_device_alloc("soc-audio", 0);
        if (!evm_snd_device)
                return -ENOMEM;

        platform_set_drvdata(evm_snd_device, &evm_snd_devdata);
        evm_snd_devdata.dev = &evm_snd_device->dev;
        evm_snd_device->dev.platform_data = &evm_snd_data;

        ret = platform_device_add_resources(evm_snd_device, evm_snd_resources,
                                            ARRAY_SIZE(evm_snd_resources));
        if (ret) {
                platform_device_put(evm_snd_device);
                return ret;
        }

        ret = platform_device_add(evm_snd_device);
        if (ret)
                platform_device_put(evm_snd_device);

        return ret;
}

static void __exit evm_exit(void)
{
        platform_device_unregister(evm_snd_device);
}

module_init(evm_init);
module_exit(evm_exit);

MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI EVM ASoC driver");
MODULE_LICENSE("GPL");