cq93vc.c

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/*
 * ALSA SoC CQ0093 Voice Codec Driver for DaVinci platforms
 *
 * Copyright (C) 2010 Texas Instruments, Inc
 *
 * Author: Miguel Aguilar <[email protected]>
 *
 * 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.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/mfd/davinci_voicecodec.h>
#include <linux/spi/spi.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

static inline unsigned int cq93vc_read(struct snd_soc_codec *codec,
                        unsigned int reg)
{
    struct davinci_vc *davinci_vc = codec->control_data;

    return readl(davinci_vc->base + reg);
}

static inline int cq93vc_write(struct snd_soc_codec *codec, unsigned int reg,
               unsigned int value)
{
    struct davinci_vc *davinci_vc = codec->control_data;

    writel(value, davinci_vc->base + reg);

    return 0;
}

static const struct snd_kcontrol_new cq93vc_snd_controls[] = {
    SOC_SINGLE("PGA Capture Volume", DAVINCI_VC_REG05, 0, 0x03, 0),
    SOC_SINGLE("Mono DAC Playback Volume", DAVINCI_VC_REG09, 0, 0x3f, 0),
};

static int cq93vc_mute(struct snd_soc_dai *dai, int mute)
{
    struct snd_soc_codec *codec = dai->codec;
    u8 reg = cq93vc_read(codec, DAVINCI_VC_REG09) & ~DAVINCI_VC_REG09_MUTE;

    if (mute)
        cq93vc_write(codec, DAVINCI_VC_REG09,
                 reg | DAVINCI_VC_REG09_MUTE);
    else
        cq93vc_write(codec, DAVINCI_VC_REG09, reg);

    return 0;
}

static int cq93vc_set_dai_sysclk(struct snd_soc_dai *codec_dai,
                 int clk_id, unsigned int freq, int dir)
{
    struct snd_soc_codec *codec = codec_dai->codec;
    struct davinci_vc *davinci_vc = codec->control_data;

    switch (freq) {
    case 22579200:
    case 27000000:
    case 33868800:
        davinci_vc->cq93vc.sysclk = freq;
        return 0;
    }

    return -EINVAL;
}

static int cq93vc_set_bias_level(struct snd_soc_codec *codec,
                enum snd_soc_bias_level level)
{
    switch (level) {
    case SND_SOC_BIAS_ON:
        cq93vc_write(codec, DAVINCI_VC_REG12,
                 DAVINCI_VC_REG12_POWER_ALL_ON);
        break;
    case SND_SOC_BIAS_PREPARE:
        break;
    case SND_SOC_BIAS_STANDBY:
        cq93vc_write(codec, DAVINCI_VC_REG12,
                 DAVINCI_VC_REG12_POWER_ALL_OFF);
        break;
    case SND_SOC_BIAS_OFF:
        /* force all power off */
        cq93vc_write(codec, DAVINCI_VC_REG12,
                 DAVINCI_VC_REG12_POWER_ALL_OFF);
        break;
    }
    codec->dapm.bias_level = level;

    return 0;
}

#define CQ93VC_RATES    (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000)
#define CQ93VC_FORMATS  (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)

static const struct snd_soc_dai_ops cq93vc_dai_ops = {
    .digital_mute   = cq93vc_mute,
    .set_sysclk = cq93vc_set_dai_sysclk,
};

static struct snd_soc_dai_driver cq93vc_dai = {
    .name = "cq93vc-hifi",
    .playback = {
        .stream_name = "Playback",
        .channels_min = 1,
        .channels_max = 2,
        .rates = CQ93VC_RATES,
        .formats = CQ93VC_FORMATS,},
    .capture = {
        .stream_name = "Capture",
        .channels_min = 1,
        .channels_max = 2,
        .rates = CQ93VC_RATES,
        .formats = CQ93VC_FORMATS,},
    .ops = &cq93vc_dai_ops,
};

static int cq93vc_resume(struct snd_soc_codec *codec)
{
    cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    return 0;
}

static int cq93vc_probe(struct snd_soc_codec *codec)
{
    struct davinci_vc *davinci_vc = codec->dev->platform_data;

    davinci_vc->cq93vc.codec = codec;
    codec->control_data = davinci_vc;

    /* Set controls */
    snd_soc_add_codec_controls(codec, cq93vc_snd_controls,
                 ARRAY_SIZE(cq93vc_snd_controls));

    /* Off, with power on */
    cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

    return 0;
}

static int cq93vc_remove(struct snd_soc_codec *codec)
{
    cq93vc_set_bias_level(codec, SND_SOC_BIAS_OFF);

    return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_cq93vc = {
    .read = cq93vc_read,
    .write = cq93vc_write,
    .set_bias_level = cq93vc_set_bias_level,
    .probe = cq93vc_probe,
    .remove = cq93vc_remove,
    .resume = cq93vc_resume,
};

static int cq93vc_platform_probe(struct platform_device *pdev)
{
    return snd_soc_register_codec(&pdev->dev,
            &soc_codec_dev_cq93vc, &cq93vc_dai, 1);
}

static int cq93vc_platform_remove(struct platform_device *pdev)
{
    snd_soc_unregister_codec(&pdev->dev);
    return 0;
}

static struct platform_driver cq93vc_codec_driver = {
    .driver = {
            .name = "cq93vc-codec",
            .owner = THIS_MODULE,
    },

    .probe = cq93vc_platform_probe,
    .remove = __devexit_p(cq93vc_platform_remove),
};

module_platform_driver(cq93vc_codec_driver);

MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC CQ0093 Voice Codec Driver");
MODULE_AUTHOR("Miguel Aguilar");
MODULE_LICENSE("GPL");