在Linux-3.0.35上移植TVL320AIC3106的声卡驱动

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/timer.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/i2c.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/soc.h>



#include <asm/dma.h>

#include <asm/mach-types.h>



#include <asm/hardware/asp.h>

#include <mach/edma.h>



#include "davinci-pcm.h"

#include "davinci-i2s.h"

#include "davinci-mcasp.h"



#define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B | \

                SND_SOC_DAIFMT_CBM_CFM | SND_SOC_DAIFMT_IB_NF)

static int com335x_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 ret = 0;

        unsigned sysclk;



        sysclk = 24576000;





        /* set codec DAI configuration */

        ret = snd_soc_dai_set_fmt(codec_dai, AUDIO_FORMAT);

        if (ret < 0)

                return ret;



        /* set cpu DAI configuration */

        ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);

        if (ret < 0)

                return ret;



        /* set the codec system clock */

        ret = snd_soc_dai_set_sysclk(codec_dai, 0, sysclk, SND_SOC_CLOCK_OUT);

        if (ret < 0)

                return ret;



        return 0;

}



static struct snd_soc_ops com335x_ops = {

        .hw_params = com335x_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 com335x_aic3x_init(struct snd_soc_pcm_runtime *rtd)

{

        struct snd_soc_codec *codec = rtd->codec;

        struct snd_soc_dapm_context *dapm = &codec->dapm;



        /* Add davinci-evm specific widgets */

        snd_soc_dapm_new_controls(dapm, aic3x_dapm_widgets,

                                  ARRAY_SIZE(aic3x_dapm_widgets));



        /* Set up davinci-evm specific audio path audio_map */

        snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));



        /* not connected */

        snd_soc_dapm_disable_pin(dapm, "MONO_LOUT");

        snd_soc_dapm_disable_pin(dapm, "HPLCOM");

        snd_soc_dapm_disable_pin(dapm, "HPRCOM");



        /* always connected */

        snd_soc_dapm_enable_pin(dapm, "Headphone Jack");

        snd_soc_dapm_enable_pin(dapm, "Line Out");

        snd_soc_dapm_enable_pin(dapm, "Mic Jack");

        snd_soc_dapm_enable_pin(dapm, "Line In");



        return 0;

}



/* davinci-evm digital audio interface glue - connects codec <--> CPU */

static struct snd_soc_dai_link com335x_dai = {

        .name = "TLV320AIC3X",

        .stream_name = "AIC3X",

        .cpu_dai_name = "davinci-mcasp.1",

        .codec_dai_name = "tlv320aic3x-hifi",

        .codec_name = "tlv320aic3x-codec.1-001b",

        .platform_name = "davinci-pcm-audio",

        .init = com335x_aic3x_init,

        .ops = &com335x_ops,

};



static struct snd_soc_card am335x_snd_soc_card = {

        .name = "COM335X EVM",

        .dai_link = &com335x_dai,

        .num_links = 1,

};



static struct platform_device *evm_snd_device;



static int __init com335x_tlv320_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, &am335x_snd_soc_card);

        

        ret = platform_device_add(evm_snd_device);

        if (ret)

                platform_device_put(evm_snd_device);



        return ret;

}



static void __exit com335x_tlv320_exit(void)

{

        platform_device_unregister(evm_snd_device);

}



module_init(com335x_tlv320_init);

module_exit(com335x_tlv320_exit);



MODULE_AUTHOR("rong gang");

MODULE_DESCRIPTION("EAC COM335X ASoC driver");

MODULE_LICENSE("GPL");