bf6xx-i2s.c

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/*
 * bf6xx-i2s.c - Analog Devices BF6XX i2s interface driver
 *
 * Copyright (c) 2012 Analog Devices Inc.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "bf6xx-sport.h"

struct sport_params param;

static int bfin_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
        unsigned int fmt)
{
    struct sport_device *sport = snd_soc_dai_get_drvdata(cpu_dai);
    struct device *dev = &sport->pdev->dev;
    int ret = 0;

    param.spctl &= ~(SPORT_CTL_OPMODE | SPORT_CTL_CKRE | SPORT_CTL_FSR
            | SPORT_CTL_LFS | SPORT_CTL_LAFS);
    switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    case SND_SOC_DAIFMT_I2S:
        param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_CKRE
            | SPORT_CTL_LFS;
        break;
    case SND_SOC_DAIFMT_DSP_A:
        param.spctl |= SPORT_CTL_FSR;
        break;
    case SND_SOC_DAIFMT_LEFT_J:
        param.spctl |= SPORT_CTL_OPMODE | SPORT_CTL_LFS
            | SPORT_CTL_LAFS;
        break;
    default:
        dev_err(dev, "%s: Unknown DAI format type\n", __func__);
        ret = -EINVAL;
        break;
    }

    param.spctl &= ~(SPORT_CTL_ICLK | SPORT_CTL_IFS);
    switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    case SND_SOC_DAIFMT_CBM_CFM:
        break;
    case SND_SOC_DAIFMT_CBS_CFS:
    case SND_SOC_DAIFMT_CBM_CFS:
    case SND_SOC_DAIFMT_CBS_CFM:
        ret = -EINVAL;
        break;
    default:
        dev_err(dev, "%s: Unknown DAI master type\n", __func__);
        ret = -EINVAL;
        break;
    }

    return ret;
}

static int bfin_i2s_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params,
                struct snd_soc_dai *dai)
{
    struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
    struct device *dev = &sport->pdev->dev;
    int ret = 0;

    param.spctl &= ~SPORT_CTL_SLEN;
    switch (params_format(params)) {
    case SNDRV_PCM_FORMAT_S8:
        param.spctl |= 0x70;
        sport->wdsize = 1;
    case SNDRV_PCM_FORMAT_S16_LE:
        param.spctl |= 0xf0;
        sport->wdsize = 2;
        break;
    case SNDRV_PCM_FORMAT_S24_LE:
        param.spctl |= 0x170;
        sport->wdsize = 3;
        break;
    case SNDRV_PCM_FORMAT_S32_LE:
        param.spctl |= 0x1f0;
        sport->wdsize = 4;
        break;
    }

    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        ret = sport_set_tx_params(sport, &param);
        if (ret) {
            dev_err(dev, "SPORT tx is busy!\n");
            return ret;
        }
    } else {
        ret = sport_set_rx_params(sport, &param);
        if (ret) {
            dev_err(dev, "SPORT rx is busy!\n");
            return ret;
        }
    }
    return 0;
}

#ifdef CONFIG_PM
static int bfin_i2s_suspend(struct snd_soc_dai *dai)
{
    struct sport_device *sport = snd_soc_dai_get_drvdata(dai);

    if (dai->capture_active)
        sport_rx_stop(sport);
    if (dai->playback_active)
        sport_tx_stop(sport);
    return 0;
}

static int bfin_i2s_resume(struct snd_soc_dai *dai)
{
    struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
    struct device *dev = &sport->pdev->dev;
    int ret;

    ret = sport_set_tx_params(sport, &param);
    if (ret) {
        dev_err(dev, "SPORT tx is busy!\n");
        return ret;
    }
    ret = sport_set_rx_params(sport, &param);
    if (ret) {
        dev_err(dev, "SPORT rx is busy!\n");
        return ret;
    }

    return 0;
}

#else
#define bfin_i2s_suspend NULL
#define bfin_i2s_resume NULL
#endif

#define BFIN_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
        SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
        SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
        SNDRV_PCM_RATE_96000)

#define BFIN_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \
        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_ops bfin_i2s_dai_ops = {
    .hw_params  = bfin_i2s_hw_params,
    .set_fmt    = bfin_i2s_set_dai_fmt,
};

static struct snd_soc_dai_driver bfin_i2s_dai = {
    .suspend = bfin_i2s_suspend,
    .resume = bfin_i2s_resume,
    .playback = {
        .channels_min = 1,
        .channels_max = 2,
        .rates = BFIN_I2S_RATES,
        .formats = BFIN_I2S_FORMATS,
    },
    .capture = {
        .channels_min = 1,
        .channels_max = 2,
        .rates = BFIN_I2S_RATES,
        .formats = BFIN_I2S_FORMATS,
    },
    .ops = &bfin_i2s_dai_ops,
};

static int __devinit bfin_i2s_probe(struct platform_device *pdev)
{
    struct sport_device *sport;
    struct device *dev = &pdev->dev;
    int ret;

    sport = sport_create(pdev);
    if (!sport)
        return -ENODEV;

    /* register with the ASoC layers */
    ret = snd_soc_register_dai(dev, &bfin_i2s_dai);
    if (ret) {
        dev_err(dev, "Failed to register DAI: %d\n", ret);
        sport_delete(sport);
        return ret;
    }
    platform_set_drvdata(pdev, sport);

    return 0;
}

static int __devexit bfin_i2s_remove(struct platform_device *pdev)
{
    struct sport_device *sport = platform_get_drvdata(pdev);

    snd_soc_unregister_dai(&pdev->dev);
    sport_delete(sport);

    return 0;
}

static struct platform_driver bfin_i2s_driver = {
    .probe  = bfin_i2s_probe,
    .remove = __devexit_p(bfin_i2s_remove),
    .driver = {
        .name = "bfin-i2s",
        .owner = THIS_MODULE,
    },
};

module_platform_driver(bfin_i2s_driver);

MODULE_DESCRIPTION("Analog Devices BF6XX i2s interface driver");
MODULE_AUTHOR("Scott Jiang <[email protected]>");
MODULE_LICENSE("GPL v2");