qi_lb60.c

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/*
 * Copyright (C) 2009, Lars-Peter Clausen <[email protected]>
 *
 * 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.
 *
 *  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/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 <linux/gpio.h>

#define QI_LB60_SND_GPIO JZ_GPIO_PORTB(29)
#define QI_LB60_AMP_GPIO JZ_GPIO_PORTD(4)

static int qi_lb60_spk_event(struct snd_soc_dapm_widget *widget,
                 struct snd_kcontrol *ctrl, int event)
{
    int on = !SND_SOC_DAPM_EVENT_OFF(event);

    gpio_set_value(QI_LB60_SND_GPIO, on);
    gpio_set_value(QI_LB60_AMP_GPIO, on);

    return 0;
}

static const struct snd_soc_dapm_widget qi_lb60_widgets[] = {
    SND_SOC_DAPM_SPK("Speaker", qi_lb60_spk_event),
    SND_SOC_DAPM_MIC("Mic", NULL),
};

static const struct snd_soc_dapm_route qi_lb60_routes[] = {
    {"Mic", NULL, "MIC"},
    {"Speaker", NULL, "LOUT"},
    {"Speaker", NULL, "ROUT"},
};

#define QI_LB60_DAIFMT (SND_SOC_DAIFMT_I2S | \
            SND_SOC_DAIFMT_NB_NF | \
            SND_SOC_DAIFMT_CBM_CFM)

static int qi_lb60_codec_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    snd_soc_dapm_nc_pin(dapm, "LIN");
    snd_soc_dapm_nc_pin(dapm, "RIN");

    ret = snd_soc_dai_set_fmt(cpu_dai, QI_LB60_DAIFMT);
    if (ret < 0) {
        dev_err(codec->dev, "Failed to set cpu dai format: %d\n", ret);
        return ret;
    }

    return 0;
}

static struct snd_soc_dai_link qi_lb60_dai = {
    .name = "jz4740",
    .stream_name = "jz4740",
    .cpu_dai_name = "jz4740-i2s",
    .platform_name = "jz4740-pcm-audio",
    .codec_dai_name = "jz4740-hifi",
    .codec_name = "jz4740-codec",
    .init = qi_lb60_codec_init,
};

static struct snd_soc_card qi_lb60 = {
    .name = "QI LB60",
    .owner = THIS_MODULE,
    .dai_link = &qi_lb60_dai,
    .num_links = 1,

    .dapm_widgets = qi_lb60_widgets,
    .num_dapm_widgets = ARRAY_SIZE(qi_lb60_widgets),
    .dapm_routes = qi_lb60_routes,
    .num_dapm_routes = ARRAY_SIZE(qi_lb60_routes),
};

static const struct gpio qi_lb60_gpios[] = {
    { QI_LB60_SND_GPIO, GPIOF_OUT_INIT_LOW, "SND" },
    { QI_LB60_AMP_GPIO, GPIOF_OUT_INIT_LOW, "AMP" },
};

static int __devinit qi_lb60_probe(struct platform_device *pdev)
{
    struct snd_soc_card *card = &qi_lb60;
    int ret;

    ret = gpio_request_array(qi_lb60_gpios, ARRAY_SIZE(qi_lb60_gpios));
    if (ret)
        return ret;

    card->dev = &pdev->dev;

    ret = snd_soc_register_card(card);
    if (ret) {
        dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
            ret);
        gpio_free_array(qi_lb60_gpios, ARRAY_SIZE(qi_lb60_gpios));
    }
    return ret;
}

static int __devexit qi_lb60_remove(struct platform_device *pdev)
{
    struct snd_soc_card *card = platform_get_drvdata(pdev);

    snd_soc_unregister_card(card);
    gpio_free_array(qi_lb60_gpios, ARRAY_SIZE(qi_lb60_gpios));
    return 0;
}

static struct platform_driver qi_lb60_driver = {
    .driver     = {
        .name   = "qi-lb60-audio",
        .owner  = THIS_MODULE,
    },
    .probe      = qi_lb60_probe,
    .remove     = __devexit_p(qi_lb60_remove),
};

module_platform_driver(qi_lb60_driver);

MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC QI LB60 Audio support");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:qi-lb60-audio");