zoom2.c

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/*
 * zoom2.c  --  SoC audio for Zoom2
 *
 * Author: Misael Lopez Cruz <[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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>
#include <linux/platform_data/gpio-omap.h>

/* Register descriptions for twl4030 codec part */
#include <linux/mfd/twl4030-audio.h>
#include <linux/module.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"

#define ZOOM2_HEADSET_MUX_GPIO      (OMAP_MAX_GPIO_LINES + 15)

static int zoom2_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;
    int ret;

    /* Set the codec system clock for DAC and ADC */
    ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
                    SND_SOC_CLOCK_IN);
    if (ret < 0) {
        printk(KERN_ERR "can't set codec system clock\n");
        return ret;
    }

    return 0;
}

static struct snd_soc_ops zoom2_ops = {
    .hw_params = zoom2_hw_params,
};

/* Zoom2 machine DAPM */
static const struct snd_soc_dapm_widget zoom2_twl4030_dapm_widgets[] = {
    SND_SOC_DAPM_MIC("Ext Mic", NULL),
    SND_SOC_DAPM_SPK("Ext Spk", NULL),
    SND_SOC_DAPM_MIC("Headset Mic", NULL),
    SND_SOC_DAPM_HP("Headset Stereophone", NULL),
    SND_SOC_DAPM_LINE("Aux In", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
    /* External Mics: MAINMIC, SUBMIC with bias*/
    {"MAINMIC", NULL, "Mic Bias 1"},
    {"SUBMIC", NULL, "Mic Bias 2"},
    {"Mic Bias 1", NULL, "Ext Mic"},
    {"Mic Bias 2", NULL, "Ext Mic"},

    /* External Speakers: HFL, HFR */
    {"Ext Spk", NULL, "HFL"},
    {"Ext Spk", NULL, "HFR"},

    /* Headset Stereophone:  HSOL, HSOR */
    {"Headset Stereophone", NULL, "HSOL"},
    {"Headset Stereophone", NULL, "HSOR"},

    /* Headset Mic: HSMIC with bias */
    {"HSMIC", NULL, "Headset Mic Bias"},
    {"Headset Mic Bias", NULL, "Headset Mic"},

    /* Aux In: AUXL, AUXR */
    {"Aux In", NULL, "AUXL"},
    {"Aux In", NULL, "AUXR"},
};

static int zoom2_twl4030_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;

    /* TWL4030 not connected pins */
    snd_soc_dapm_nc_pin(dapm, "CARKITMIC");
    snd_soc_dapm_nc_pin(dapm, "DIGIMIC0");
    snd_soc_dapm_nc_pin(dapm, "DIGIMIC1");
    snd_soc_dapm_nc_pin(dapm, "EARPIECE");
    snd_soc_dapm_nc_pin(dapm, "PREDRIVEL");
    snd_soc_dapm_nc_pin(dapm, "PREDRIVER");
    snd_soc_dapm_nc_pin(dapm, "CARKITL");
    snd_soc_dapm_nc_pin(dapm, "CARKITR");

    return 0;
}

static int zoom2_twl4030_voice_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    unsigned short reg;

    /* Enable voice interface */
    reg = codec->driver->read(codec, TWL4030_REG_VOICE_IF);
    reg |= TWL4030_VIF_DIN_EN | TWL4030_VIF_DOUT_EN | TWL4030_VIF_EN;
    codec->driver->write(codec, TWL4030_REG_VOICE_IF, reg);

    return 0;
}

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link zoom2_dai[] = {
    {
        .name = "TWL4030 I2S",
        .stream_name = "TWL4030 Audio",
        .cpu_dai_name = "omap-mcbsp.2",
        .codec_dai_name = "twl4030-hifi",
        .platform_name = "omap-pcm-audio",
        .codec_name = "twl4030-codec",
        .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
               SND_SOC_DAIFMT_CBM_CFM,
        .init = zoom2_twl4030_init,
        .ops = &zoom2_ops,
    },
    {
        .name = "TWL4030 PCM",
        .stream_name = "TWL4030 Voice",
        .cpu_dai_name = "omap-mcbsp.3",
        .codec_dai_name = "twl4030-voice",
        .platform_name = "omap-pcm-audio",
        .codec_name = "twl4030-codec",
        .dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_IB_NF |
               SND_SOC_DAIFMT_CBM_CFM,
        .init = zoom2_twl4030_voice_init,
        .ops = &zoom2_ops,
    },
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_zoom2 = {
    .name = "Zoom2",
    .owner = THIS_MODULE,
    .dai_link = zoom2_dai,
    .num_links = ARRAY_SIZE(zoom2_dai),

    .dapm_widgets = zoom2_twl4030_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(zoom2_twl4030_dapm_widgets),
    .dapm_routes = audio_map,
    .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static struct platform_device *zoom2_snd_device;

static int __init zoom2_soc_init(void)
{
    int ret;

    if (!machine_is_omap_zoom2())
        return -ENODEV;
    printk(KERN_INFO "Zoom2 SoC init\n");

    zoom2_snd_device = platform_device_alloc("soc-audio", -1);
    if (!zoom2_snd_device) {
        printk(KERN_ERR "Platform device allocation failed\n");
        return -ENOMEM;
    }

    platform_set_drvdata(zoom2_snd_device, &snd_soc_zoom2);
    ret = platform_device_add(zoom2_snd_device);
    if (ret)
        goto err1;

    BUG_ON(gpio_request(ZOOM2_HEADSET_MUX_GPIO, "hs_mux") < 0);
    gpio_direction_output(ZOOM2_HEADSET_MUX_GPIO, 0);

    return 0;

err1:
    printk(KERN_ERR "Unable to add platform device\n");
    platform_device_put(zoom2_snd_device);

    return ret;
}
module_init(zoom2_soc_init);

static void __exit zoom2_soc_exit(void)
{
    gpio_free(ZOOM2_HEADSET_MUX_GPIO);

    platform_device_unregister(zoom2_snd_device);
}
module_exit(zoom2_soc_exit);

MODULE_AUTHOR("Misael Lopez Cruz <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC Zoom2");
MODULE_LICENSE("GPL");