omap3pandora.c

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/*
 * omap3pandora.c  --  SoC audio for Pandora Handheld Console
 *
 * Author: Gražvydas Ignotas <[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 <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/module.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 "omap-mcbsp.h"
#include "omap-pcm.h"

#define OMAP3_PANDORA_DAC_POWER_GPIO    118
#define OMAP3_PANDORA_AMP_POWER_GPIO    14

#define PREFIX "ASoC omap3pandora: "

static struct regulator *omap3pandora_dac_reg;

static int omap3pandora_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 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) {
        pr_err(PREFIX "can't set codec system clock\n");
        return ret;
    }

    /* Set McBSP clock to external */
    ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT,
                     256 * params_rate(params),
                     SND_SOC_CLOCK_IN);
    if (ret < 0) {
        pr_err(PREFIX "can't set cpu system clock\n");
        return ret;
    }

    ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 8);
    if (ret < 0) {
        pr_err(PREFIX "can't set SRG clock divider\n");
        return ret;
    }

    return 0;
}

static int omap3pandora_dac_event(struct snd_soc_dapm_widget *w,
    struct snd_kcontrol *k, int event)
{
    /*
     * The PCM1773 DAC datasheet requires 1ms delay between switching
     * VCC power on/off and /PD pin high/low
     */
    if (SND_SOC_DAPM_EVENT_ON(event)) {
        regulator_enable(omap3pandora_dac_reg);
        mdelay(1);
        gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 1);
    } else {
        gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
        mdelay(1);
        regulator_disable(omap3pandora_dac_reg);
    }

    return 0;
}

static int omap3pandora_hp_event(struct snd_soc_dapm_widget *w,
    struct snd_kcontrol *k, int event)
{
    if (SND_SOC_DAPM_EVENT_ON(event))
        gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 1);
    else
        gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 0);

    return 0;
}

/*
 * Audio paths on Pandora board:
 *
 *  |O| ---> PCM DAC +-> AMP -> Headphone Jack
 *  |M|         A    +--------> Line Out
 *  |A| <~~clk~~+
 *  |P| <--- TWL4030 <--------- Line In and MICs
 */
static const struct snd_soc_dapm_widget omap3pandora_out_dapm_widgets[] = {
    SND_SOC_DAPM_DAC_E("PCM DAC", "HiFi Playback", SND_SOC_NOPM,
               0, 0, omap3pandora_dac_event,
               SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
    SND_SOC_DAPM_PGA_E("Headphone Amplifier", SND_SOC_NOPM,
               0, 0, NULL, 0, omap3pandora_hp_event,
               SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
    SND_SOC_DAPM_HP("Headphone Jack", NULL),
    SND_SOC_DAPM_LINE("Line Out", NULL),
};

static const struct snd_soc_dapm_widget omap3pandora_in_dapm_widgets[] = {
    SND_SOC_DAPM_MIC("Mic (internal)", NULL),
    SND_SOC_DAPM_MIC("Mic (external)", NULL),
    SND_SOC_DAPM_LINE("Line In", NULL),
};

static const struct snd_soc_dapm_route omap3pandora_out_map[] = {
    {"PCM DAC", NULL, "APLL Enable"},
    {"Headphone Amplifier", NULL, "PCM DAC"},
    {"Line Out", NULL, "PCM DAC"},
    {"Headphone Jack", NULL, "Headphone Amplifier"},
};

static const struct snd_soc_dapm_route omap3pandora_in_map[] = {
    {"AUXL", NULL, "Line In"},
    {"AUXR", NULL, "Line In"},

    {"MAINMIC", NULL, "Mic Bias 1"},
    {"Mic Bias 1", NULL, "Mic (internal)"},

    {"SUBMIC", NULL, "Mic Bias 2"},
    {"Mic Bias 2", NULL, "Mic (external)"},
};

static int omap3pandora_out_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    /* All TWL4030 output pins are floating */
    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, "HSOL");
    snd_soc_dapm_nc_pin(dapm, "HSOR");
    snd_soc_dapm_nc_pin(dapm, "CARKITL");
    snd_soc_dapm_nc_pin(dapm, "CARKITR");
    snd_soc_dapm_nc_pin(dapm, "HFL");
    snd_soc_dapm_nc_pin(dapm, "HFR");
    snd_soc_dapm_nc_pin(dapm, "VIBRA");

    ret = snd_soc_dapm_new_controls(dapm, omap3pandora_out_dapm_widgets,
                ARRAY_SIZE(omap3pandora_out_dapm_widgets));
    if (ret < 0)
        return ret;

    return snd_soc_dapm_add_routes(dapm, omap3pandora_out_map,
        ARRAY_SIZE(omap3pandora_out_map));
}

static int omap3pandora_in_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    /* Not comnnected */
    snd_soc_dapm_nc_pin(dapm, "HSMIC");
    snd_soc_dapm_nc_pin(dapm, "CARKITMIC");
    snd_soc_dapm_nc_pin(dapm, "DIGIMIC0");
    snd_soc_dapm_nc_pin(dapm, "DIGIMIC1");

    ret = snd_soc_dapm_new_controls(dapm, omap3pandora_in_dapm_widgets,
                ARRAY_SIZE(omap3pandora_in_dapm_widgets));
    if (ret < 0)
        return ret;

    return snd_soc_dapm_add_routes(dapm, omap3pandora_in_map,
        ARRAY_SIZE(omap3pandora_in_map));
}

static struct snd_soc_ops omap3pandora_ops = {
    .hw_params = omap3pandora_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap3pandora_dai[] = {
    {
        .name = "PCM1773",
        .stream_name = "HiFi Out",
        .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_CBS_CFS,
        .ops = &omap3pandora_ops,
        .init = omap3pandora_out_init,
    }, {
        .name = "TWL4030",
        .stream_name = "Line/Mic In",
        .cpu_dai_name = "omap-mcbsp.4",
        .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_CBS_CFS,
        .ops = &omap3pandora_ops,
        .init = omap3pandora_in_init,
    }
};

/* SoC card */
static struct snd_soc_card snd_soc_card_omap3pandora = {
    .name = "omap3pandora",
    .owner = THIS_MODULE,
    .dai_link = omap3pandora_dai,
    .num_links = ARRAY_SIZE(omap3pandora_dai),
};

static struct platform_device *omap3pandora_snd_device;

static int __init omap3pandora_soc_init(void)
{
    int ret;

    if (!machine_is_omap3_pandora())
        return -ENODEV;

    pr_info("OMAP3 Pandora SoC init\n");

    ret = gpio_request(OMAP3_PANDORA_DAC_POWER_GPIO, "dac_power");
    if (ret) {
        pr_err(PREFIX "Failed to get DAC power GPIO\n");
        return ret;
    }

    ret = gpio_direction_output(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
    if (ret) {
        pr_err(PREFIX "Failed to set DAC power GPIO direction\n");
        goto fail0;
    }

    ret = gpio_request(OMAP3_PANDORA_AMP_POWER_GPIO, "amp_power");
    if (ret) {
        pr_err(PREFIX "Failed to get amp power GPIO\n");
        goto fail0;
    }

    ret = gpio_direction_output(OMAP3_PANDORA_AMP_POWER_GPIO, 0);
    if (ret) {
        pr_err(PREFIX "Failed to set amp power GPIO direction\n");
        goto fail1;
    }

    omap3pandora_snd_device = platform_device_alloc("soc-audio", -1);
    if (omap3pandora_snd_device == NULL) {
        pr_err(PREFIX "Platform device allocation failed\n");
        ret = -ENOMEM;
        goto fail1;
    }

    platform_set_drvdata(omap3pandora_snd_device, &snd_soc_card_omap3pandora);

    ret = platform_device_add(omap3pandora_snd_device);
    if (ret) {
        pr_err(PREFIX "Unable to add platform device\n");
        goto fail2;
    }

    omap3pandora_dac_reg = regulator_get(&omap3pandora_snd_device->dev, "vcc");
    if (IS_ERR(omap3pandora_dac_reg)) {
        pr_err(PREFIX "Failed to get DAC regulator from %s: %ld\n",
            dev_name(&omap3pandora_snd_device->dev),
            PTR_ERR(omap3pandora_dac_reg));
        ret = PTR_ERR(omap3pandora_dac_reg);
        goto fail3;
    }

    return 0;

fail3:
    platform_device_del(omap3pandora_snd_device);
fail2:
    platform_device_put(omap3pandora_snd_device);
fail1:
    gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
fail0:
    gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
    return ret;
}
module_init(omap3pandora_soc_init);

static void __exit omap3pandora_soc_exit(void)
{
    regulator_put(omap3pandora_dac_reg);
    platform_device_unregister(omap3pandora_snd_device);
    gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
    gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
}
module_exit(omap3pandora_soc_exit);

MODULE_AUTHOR("Grazvydas Ignotas <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC OMAP3 Pandora");
MODULE_LICENSE("GPL");