tobermory.c

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/*
 * Tobermory audio support
 *
 * Copyright 2011 Wolfson Microelectronics
 *
 * 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.
 */

#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/jack.h>
#include <linux/gpio.h>
#include <linux/module.h>

#include "../codecs/wm8962.h"

static int sample_rate = 44100;

static int tobermory_set_bias_level(struct snd_soc_card *card,
                      struct snd_soc_dapm_context *dapm,
                      enum snd_soc_bias_level level)
{
    struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
    int ret;

    if (dapm->dev != codec_dai->dev)
        return 0;

    switch (level) {
    case SND_SOC_BIAS_PREPARE:
        if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
            ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
                          WM8962_FLL_MCLK, 32768,
                          sample_rate * 512);
            if (ret < 0)
                pr_err("Failed to start FLL: %d\n", ret);

            ret = snd_soc_dai_set_sysclk(codec_dai,
                             WM8962_SYSCLK_FLL,
                             sample_rate * 512,
                             SND_SOC_CLOCK_IN);
            if (ret < 0) {
                pr_err("Failed to set SYSCLK: %d\n", ret);
                return ret;
            }
        }
        break;

    default:
        break;
    }

    return 0;
}

static int tobermory_set_bias_level_post(struct snd_soc_card *card,
                           struct snd_soc_dapm_context *dapm,
                           enum snd_soc_bias_level level)
{
    struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
    int ret;

    if (dapm->dev != codec_dai->dev)
        return 0;

    switch (level) {
    case SND_SOC_BIAS_STANDBY:
        ret = snd_soc_dai_set_sysclk(codec_dai, WM8962_SYSCLK_MCLK,
                         32768, SND_SOC_CLOCK_IN);
        if (ret < 0) {
            pr_err("Failed to switch away from FLL: %d\n", ret);
            return ret;
        }

        ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
                      0, 0, 0);
        if (ret < 0) {
            pr_err("Failed to stop FLL: %d\n", ret);
            return ret;
        }
        break;

    default:
        break;
    }

    dapm->bias_level = level;

    return 0;
}

static int tobermory_hw_params(struct snd_pcm_substream *substream,
                  struct snd_pcm_hw_params *params)
{
    sample_rate = params_rate(params);

    return 0;
}

static struct snd_soc_ops tobermory_ops = {
    .hw_params = tobermory_hw_params,
};

static struct snd_soc_dai_link tobermory_dai[] = {
    {
        .name = "CPU",
        .stream_name = "CPU",
        .cpu_dai_name = "samsung-i2s.0",
        .codec_dai_name = "wm8962",
        .platform_name = "samsung-audio",
        .codec_name = "wm8962.1-001a",
        .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
                | SND_SOC_DAIFMT_CBM_CFM,
        .ops = &tobermory_ops,
    },
};

static const struct snd_kcontrol_new controls[] = {
    SOC_DAPM_PIN_SWITCH("Main Speaker"),
    SOC_DAPM_PIN_SWITCH("DMIC"),
};

static struct snd_soc_dapm_widget widgets[] = {
    SND_SOC_DAPM_HP("Headphone", NULL),
    SND_SOC_DAPM_MIC("Headset Mic", NULL),

    SND_SOC_DAPM_MIC("DMIC", NULL),
    SND_SOC_DAPM_MIC("AMIC", NULL),

    SND_SOC_DAPM_SPK("Main Speaker", NULL),
};

static struct snd_soc_dapm_route audio_paths[] = {
    { "Headphone", NULL, "HPOUTL" },
    { "Headphone", NULL, "HPOUTR" },

    { "Main Speaker", NULL, "SPKOUTL" },
    { "Main Speaker", NULL, "SPKOUTR" },

    { "Headset Mic", NULL, "MICBIAS" },
    { "IN4L", NULL, "Headset Mic" },
    { "IN4R", NULL, "Headset Mic" },

    { "AMIC", NULL, "MICBIAS" },
    { "IN1L", NULL, "AMIC" },
    { "IN1R", NULL, "AMIC" },

    { "DMIC", NULL, "MICBIAS" },
    { "DMICDAT", NULL, "DMIC" },
};

static struct snd_soc_jack tobermory_headset;

/* Headset jack detection DAPM pins */
static struct snd_soc_jack_pin tobermory_headset_pins[] = {
    {
        .pin = "Headset Mic",
        .mask = SND_JACK_MICROPHONE,
    },
    {
        .pin = "Headphone",
        .mask = SND_JACK_MICROPHONE,
    },
};

static int tobermory_late_probe(struct snd_soc_card *card)
{
    struct snd_soc_codec *codec = card->rtd[0].codec;
    struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
    int ret;

    ret = snd_soc_dai_set_sysclk(codec_dai, WM8962_SYSCLK_MCLK,
                     32768, SND_SOC_CLOCK_IN);
    if (ret < 0)
        return ret;

    ret = snd_soc_jack_new(codec, "Headset",
                   SND_JACK_HEADSET | SND_JACK_BTN_0,
                   &tobermory_headset);
    if (ret)
        return ret;

    ret = snd_soc_jack_add_pins(&tobermory_headset,
                    ARRAY_SIZE(tobermory_headset_pins),
                    tobermory_headset_pins);
    if (ret)
        return ret;

    wm8962_mic_detect(codec, &tobermory_headset);

    return 0;
}

static struct snd_soc_card tobermory = {
    .name = "Tobermory",
    .owner = THIS_MODULE,
    .dai_link = tobermory_dai,
    .num_links = ARRAY_SIZE(tobermory_dai),

    .set_bias_level = tobermory_set_bias_level,
    .set_bias_level_post = tobermory_set_bias_level_post,

    .controls = controls,
    .num_controls = ARRAY_SIZE(controls),
    .dapm_widgets = widgets,
    .num_dapm_widgets = ARRAY_SIZE(widgets),
    .dapm_routes = audio_paths,
    .num_dapm_routes = ARRAY_SIZE(audio_paths),
    .fully_routed = true,

    .late_probe = tobermory_late_probe,
};

static __devinit int tobermory_probe(struct platform_device *pdev)
{
    struct snd_soc_card *card = &tobermory;
    int 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);
        return ret;
    }

    return 0;
}

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

    snd_soc_unregister_card(card);

    return 0;
}

static struct platform_driver tobermory_driver = {
    .driver = {
        .name = "tobermory",
        .owner = THIS_MODULE,
        .pm = &snd_soc_pm_ops,
    },
    .probe = tobermory_probe,
    .remove = __devexit_p(tobermory_remove),
};

module_platform_driver(tobermory_driver);

MODULE_DESCRIPTION("Tobermory audio support");
MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tobermory");