hx4700.c

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/*
 * SoC audio for HP iPAQ hx4700
 *
 * Copyright (c) 2009 Philipp Zabel
 *
 *  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 <linux/module.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/gpio.h>

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

#include <mach/hx4700.h>
#include <asm/mach-types.h>
#include "pxa2xx-i2s.h"

#include "../codecs/ak4641.h"

static struct snd_soc_jack hs_jack;

/* Headphones jack detection DAPM pin */
static struct snd_soc_jack_pin hs_jack_pin[] = {
    {
        .pin    = "Headphone Jack",
        .mask   = SND_JACK_HEADPHONE,
    },
    {
        .pin    = "Speaker",
        /* disable speaker when hp jack is inserted */
        .mask   = SND_JACK_HEADPHONE,
        .invert = 1,
    },
};

/* Headphones jack detection GPIO */
static struct snd_soc_jack_gpio hs_jack_gpio = {
    .gpio       = GPIO75_HX4700_EARPHONE_nDET,
    .invert     = true,
    .name       = "hp-gpio",
    .report     = SND_JACK_HEADPHONE,
    .debounce_time  = 200,
};

/*
 * iPAQ hx4700 uses I2S for capture and playback.
 */
static int hx4700_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 = 0;

    /* set the I2S system clock as output */
    ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, 0,
            SND_SOC_CLOCK_OUT);
    if (ret < 0)
        return ret;

    /* inform codec driver about clock freq *
     * (PXA I2S always uses divider 256)    */
    ret = snd_soc_dai_set_sysclk(codec_dai, 0, 256 * params_rate(params),
            SND_SOC_CLOCK_IN);
    if (ret < 0)
        return ret;

    return 0;
}

static struct snd_soc_ops hx4700_ops = {
    .hw_params = hx4700_hw_params,
};

static int hx4700_spk_power(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *k, int event)
{
    gpio_set_value(GPIO107_HX4700_SPK_nSD, !!SND_SOC_DAPM_EVENT_ON(event));
    return 0;
}

static int hx4700_hp_power(struct snd_soc_dapm_widget *w,
               struct snd_kcontrol *k, int event)
{
    gpio_set_value(GPIO92_HX4700_HP_DRIVER, !!SND_SOC_DAPM_EVENT_ON(event));
    return 0;
}

/* hx4700 machine dapm widgets */
static const struct snd_soc_dapm_widget hx4700_dapm_widgets[] = {
    SND_SOC_DAPM_HP("Headphone Jack", hx4700_hp_power),
    SND_SOC_DAPM_SPK("Speaker", hx4700_spk_power),
    SND_SOC_DAPM_MIC("Built-in Microphone", NULL),
};

/* hx4700 machine audio_map */
static const struct snd_soc_dapm_route hx4700_audio_map[] = {

    /* Headphone connected to LOUT, ROUT */
    {"Headphone Jack", NULL, "LOUT"},
    {"Headphone Jack", NULL, "ROUT"},

    /* Speaker connected to MOUT2 */
    {"Speaker", NULL, "MOUT2"},

    /* Microphone connected to MICIN */
    {"MICIN", NULL, "Built-in Microphone"},
    {"AIN", NULL, "MICOUT"},
};

/*
 * Logic for a ak4641 as connected on a HP iPAQ hx4700
 */
static int hx4700_ak4641_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int err;

    /* NC codec pins */
    /* FIXME: is anything connected here? */
    snd_soc_dapm_nc_pin(dapm, "MOUT1");
    snd_soc_dapm_nc_pin(dapm, "MICEXT");
    snd_soc_dapm_nc_pin(dapm, "AUX");

    /* Jack detection API stuff */
    err = snd_soc_jack_new(codec, "Headphone Jack",
                SND_JACK_HEADPHONE, &hs_jack);
    if (err)
        return err;

    err = snd_soc_jack_add_pins(&hs_jack, ARRAY_SIZE(hs_jack_pin),
                    hs_jack_pin);
    if (err)
        return err;

    err = snd_soc_jack_add_gpios(&hs_jack, 1, &hs_jack_gpio);

    return err;
}

/* hx4700 digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link hx4700_dai = {
    .name = "ak4641",
    .stream_name = "AK4641",
    .cpu_dai_name = "pxa2xx-i2s",
    .codec_dai_name = "ak4641-hifi",
    .platform_name = "pxa-pcm-audio",
    .codec_name = "ak4641.0-0012",
    .init = hx4700_ak4641_init,
    .dai_fmt = SND_SOC_DAIFMT_MSB | SND_SOC_DAIFMT_NB_NF |
           SND_SOC_DAIFMT_CBS_CFS,
    .ops = &hx4700_ops,
};

/* hx4700 audio machine driver */
static struct snd_soc_card snd_soc_card_hx4700 = {
    .name           = "iPAQ hx4700",
    .owner          = THIS_MODULE,
    .dai_link       = &hx4700_dai,
    .num_links      = 1,
    .dapm_widgets       = hx4700_dapm_widgets,
    .num_dapm_widgets   = ARRAY_SIZE(hx4700_dapm_widgets),
    .dapm_routes        = hx4700_audio_map,
    .num_dapm_routes    = ARRAY_SIZE(hx4700_audio_map),
};

static struct gpio hx4700_audio_gpios[] = {
    { GPIO107_HX4700_SPK_nSD, GPIOF_OUT_INIT_HIGH, "SPK_POWER" },
    { GPIO92_HX4700_HP_DRIVER, GPIOF_OUT_INIT_LOW, "EP_POWER" },
};

static int __devinit hx4700_audio_probe(struct platform_device *pdev)
{
    int ret;

    if (!machine_is_h4700())
        return -ENODEV;

    ret = gpio_request_array(hx4700_audio_gpios,
                ARRAY_SIZE(hx4700_audio_gpios));
    if (ret)
        return ret;

    snd_soc_card_hx4700.dev = &pdev->dev;
    ret = snd_soc_register_card(&snd_soc_card_hx4700);
    if (ret)
        gpio_free_array(hx4700_audio_gpios,
                ARRAY_SIZE(hx4700_audio_gpios));

    return ret;
}

static int __devexit hx4700_audio_remove(struct platform_device *pdev)
{
    snd_soc_jack_free_gpios(&hs_jack, 1, &hs_jack_gpio);
    snd_soc_unregister_card(&snd_soc_card_hx4700);

    gpio_set_value(GPIO92_HX4700_HP_DRIVER, 0);
    gpio_set_value(GPIO107_HX4700_SPK_nSD, 0);

    gpio_free_array(hx4700_audio_gpios, ARRAY_SIZE(hx4700_audio_gpios));
    return 0;
}

static struct platform_driver hx4700_audio_driver = {
    .driver = {
        .name = "hx4700-audio",
        .owner = THIS_MODULE,
        .pm = &snd_soc_pm_ops,
    },
    .probe  = hx4700_audio_probe,
    .remove = __devexit_p(hx4700_audio_remove),
};

module_platform_driver(hx4700_audio_driver);

MODULE_AUTHOR("Philipp Zabel");
MODULE_DESCRIPTION("ALSA SoC iPAQ hx4700");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:hx4700-audio");