smdk_wm8580pcm.c

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/*
 *  sound/soc/samsung/smdk_wm8580pcm.c
 *
 *  Copyright (c) 2011 Samsung Electronics Co. Ltd
 *
 *  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/module.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/pcm.h>

#include <asm/mach-types.h>

#include "../codecs/wm8580.h"
#include "dma.h"
#include "pcm.h"

/*
 * Board Settings:
 *  o '1' means 'ON'
 *  o '0' means 'OFF'
 *  o 'X' means 'Don't care'
 *
 * SMDK6410, SMDK6440, SMDK6450 Base B/D: CFG1-0000, CFG2-1111
 * SMDKC110, SMDKV210: CFGB11-100100, CFGB12-0000
 */

#define SMDK_WM8580_EXT_OSC 12000000
#define SMDK_WM8580_EXT_MCLK 4096000
#define SMDK_WM8580_EXT_VOICE 2048000

static unsigned long mclk_freq;
static unsigned long xtal_freq;

/*
 * If MCLK clock directly gets from XTAL, we don't have to use PLL
 * to make MCLK, but if XTAL clock source connects with other codec
 * pin (like XTI), we should have to set codec's PLL to make MCLK.
 * Because Samsung SoC does not support pcmcdclk output like I2S.
 */

static int smdk_wm8580_pcm_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 rfs, ret;

    switch (params_rate(params)) {
    case 8000:
        break;
    default:
        printk(KERN_ERR "%s:%d Sampling Rate %u not supported!\n",
        __func__, __LINE__, params_rate(params));
        return -EINVAL;
    }

    rfs = mclk_freq / params_rate(params) / 2;

    /* Set the codec DAI configuration */
    ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B
                | SND_SOC_DAIFMT_IB_NF
                | SND_SOC_DAIFMT_CBS_CFS);
    if (ret < 0)
        return ret;

    /* Set the cpu DAI configuration */
    ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_B
                | SND_SOC_DAIFMT_IB_NF
                | SND_SOC_DAIFMT_CBS_CFS);
    if (ret < 0)
        return ret;

    if (mclk_freq == xtal_freq) {
        ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_MCLK,
                        mclk_freq, SND_SOC_CLOCK_IN);
        if (ret < 0)
            return ret;

        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
                        WM8580_CLKSRC_MCLK);
        if (ret < 0)
            return ret;
    } else {
        ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_PLLA,
                        mclk_freq, SND_SOC_CLOCK_IN);
        if (ret < 0)
            return ret;

        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
                        WM8580_CLKSRC_PLLA);
        if (ret < 0)
            return ret;

        ret = snd_soc_dai_set_pll(codec_dai, WM8580_PLLA, 0,
                        xtal_freq, mclk_freq);
        if (ret < 0)
            return ret;
    }

    /* Set PCM source clock on CPU */
    ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,
                    mclk_freq, SND_SOC_CLOCK_IN);
    if (ret < 0)
        return ret;

    /* Set SCLK_DIV for making bclk */
    ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
    if (ret < 0)
        return ret;

    return 0;
}

static struct snd_soc_ops smdk_wm8580_pcm_ops = {
    .hw_params = smdk_wm8580_pcm_hw_params,
};

static struct snd_soc_dai_link smdk_dai[] = {
    {
        .name = "WM8580 PAIF PCM RX",
        .stream_name = "Playback",
        .cpu_dai_name = "samsung-pcm.0",
        .codec_dai_name = "wm8580-hifi-playback",
        .platform_name = "samsung-audio",
        .codec_name = "wm8580.0-001b",
        .ops = &smdk_wm8580_pcm_ops,
    }, {
        .name = "WM8580 PAIF PCM TX",
        .stream_name = "Capture",
        .cpu_dai_name = "samsung-pcm.0",
        .codec_dai_name = "wm8580-hifi-capture",
        .platform_name = "samsung-audio",
        .codec_name = "wm8580.0-001b",
        .ops = &smdk_wm8580_pcm_ops,
    },
};

static struct snd_soc_card smdk_pcm = {
    .name = "SMDK-PCM",
    .owner = THIS_MODULE,
    .dai_link = smdk_dai,
    .num_links = 2,
};

/*
 * After SMDKC110 Base Board's Rev is '0.1', 12MHz External OSC(X1)
 * is absent (or not connected), so we connect EXT_VOICE_CLK(OSC4),
 * 2.0484Mhz, directly with MCLK both Codec and SoC.
 */
static int __devinit snd_smdk_probe(struct platform_device *pdev)
{
    int ret = 0;

    xtal_freq = SMDK_WM8580_EXT_OSC;
    mclk_freq = SMDK_WM8580_EXT_MCLK;

    if (machine_is_smdkc110() || machine_is_smdkv210())
        xtal_freq = mclk_freq = SMDK_WM8580_EXT_VOICE;

    smdk_pcm.dev = &pdev->dev;
    ret = snd_soc_register_card(&smdk_pcm);
    if (ret) {
        dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
        return ret;
    }

    return 0;
}

static int __devexit snd_smdk_remove(struct platform_device *pdev)
{
    snd_soc_unregister_card(&smdk_pcm);
    platform_set_drvdata(pdev, NULL);
    return 0;
}

static struct platform_driver snd_smdk_driver = {
    .driver = {
        .owner = THIS_MODULE,
        .name = "samsung-smdk-pcm",
    },
    .probe = snd_smdk_probe,
    .remove = __devexit_p(snd_smdk_remove),
};

module_platform_driver(snd_smdk_driver);

MODULE_AUTHOR("Sangbeom Kim, <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC SMDK WM8580 for PCM");
MODULE_LICENSE("GPL");