z2.c

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/*
 * linux/sound/soc/pxa/z2.c
 *
 * SoC Audio driver for Aeronix Zipit Z2
 *
 * Copyright (C) 2009 Ken McGuire <[email protected]>
 * Copyright (C) 2010 Marek Vasut <[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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

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

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/audio.h>
#include <mach/z2.h>

#include "../codecs/wm8750.h"
#include "pxa2xx-i2s.h"

static struct snd_soc_card snd_soc_z2;

static int z2_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;
    unsigned int clk = 0;
    int ret = 0;

    switch (params_rate(params)) {
    case 8000:
    case 16000:
    case 48000:
    case 96000:
        clk = 12288000;
        break;
    case 11025:
    case 22050:
    case 44100:
        clk = 11289600;
        break;
    }

    /* set the codec system clock for DAC and ADC */
    ret = snd_soc_dai_set_sysclk(codec_dai, WM8750_SYSCLK, clk,
        SND_SOC_CLOCK_IN);
    if (ret < 0)
        return ret;

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

    return 0;
}

static struct snd_soc_jack hs_jack;

/* Headset jack detection DAPM pins */
static struct snd_soc_jack_pin hs_jack_pins[] = {
    {
        .pin    = "Mic Jack",
        .mask   = SND_JACK_MICROPHONE,
    },
    {
        .pin    = "Headphone Jack",
        .mask   = SND_JACK_HEADPHONE,
    },
    {
        .pin    = "Ext Spk",
        .mask   = SND_JACK_HEADPHONE,
        .invert = 1
    },
};

/* Headset jack detection gpios */
static struct snd_soc_jack_gpio hs_jack_gpios[] = {
    {
        .gpio       = GPIO37_ZIPITZ2_HEADSET_DETECT,
        .name       = "hsdet-gpio",
        .report     = SND_JACK_HEADSET,
        .debounce_time  = 200,
        .invert     = 1,
    },
};

/* z2 machine dapm widgets */
static const struct snd_soc_dapm_widget wm8750_dapm_widgets[] = {
    SND_SOC_DAPM_HP("Headphone Jack", NULL),
    SND_SOC_DAPM_MIC("Mic Jack", NULL),
    SND_SOC_DAPM_SPK("Ext Spk", NULL),

    /* headset is a mic and mono headphone */
    SND_SOC_DAPM_HP("Headset Jack", NULL),
};

/* Z2 machine audio_map */
static const struct snd_soc_dapm_route z2_audio_map[] = {

    /* headphone connected to LOUT1, ROUT1 */
    {"Headphone Jack", NULL, "LOUT1"},
    {"Headphone Jack", NULL, "ROUT1"},

    /* ext speaker connected to LOUT2, ROUT2  */
    {"Ext Spk", NULL , "ROUT2"},
    {"Ext Spk", NULL , "LOUT2"},

    /* mic is connected to R input 2 - with bias */
    {"RINPUT2", NULL, "Mic Bias"},
    {"Mic Bias", NULL, "Mic Jack"},
};

/*
 * Logic for a wm8750 as connected on a Z2 Device
 */
static int z2_wm8750_init(struct snd_soc_pcm_runtime *rtd)
{
    struct snd_soc_codec *codec = rtd->codec;
    struct snd_soc_dapm_context *dapm = &codec->dapm;
    int ret;

    /* NC codec pins */
    snd_soc_dapm_disable_pin(dapm, "LINPUT3");
    snd_soc_dapm_disable_pin(dapm, "RINPUT3");
    snd_soc_dapm_disable_pin(dapm, "OUT3");
    snd_soc_dapm_disable_pin(dapm, "MONO1");

    /* Jack detection API stuff */
    ret = snd_soc_jack_new(codec, "Headset Jack", SND_JACK_HEADSET,
                &hs_jack);
    if (ret)
        goto err;

    ret = snd_soc_jack_add_pins(&hs_jack, ARRAY_SIZE(hs_jack_pins),
                hs_jack_pins);
    if (ret)
        goto err;

    ret = snd_soc_jack_add_gpios(&hs_jack, ARRAY_SIZE(hs_jack_gpios),
                hs_jack_gpios);
    if (ret)
        goto err;

    return 0;

err:
    return ret;
}

static struct snd_soc_ops z2_ops = {
    .hw_params = z2_hw_params,
};

/* z2 digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link z2_dai = {
    .name       = "wm8750",
    .stream_name    = "WM8750",
    .cpu_dai_name   = "pxa2xx-i2s",
    .codec_dai_name = "wm8750-hifi",
    .platform_name = "pxa-pcm-audio",
    .codec_name = "wm8750.0-001b",
    .init       = z2_wm8750_init,
    .dai_fmt    = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
              SND_SOC_DAIFMT_CBS_CFS,
    .ops        = &z2_ops,
};

/* z2 audio machine driver */
static struct snd_soc_card snd_soc_z2 = {
    .name       = "Z2",
    .owner      = THIS_MODULE,
    .dai_link   = &z2_dai,
    .num_links  = 1,

    .dapm_widgets = wm8750_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(wm8750_dapm_widgets),
    .dapm_routes = z2_audio_map,
    .num_dapm_routes = ARRAY_SIZE(z2_audio_map),
};

static struct platform_device *z2_snd_device;

static int __init z2_init(void)
{
    int ret;

    if (!machine_is_zipit2())
        return -ENODEV;

    z2_snd_device = platform_device_alloc("soc-audio", -1);
    if (!z2_snd_device)
        return -ENOMEM;

    platform_set_drvdata(z2_snd_device, &snd_soc_z2);
    ret = platform_device_add(z2_snd_device);

    if (ret)
        platform_device_put(z2_snd_device);

    return ret;
}

static void __exit z2_exit(void)
{
    platform_device_unregister(z2_snd_device);
}

module_init(z2_init);
module_exit(z2_exit);

MODULE_AUTHOR("Ken McGuire <[email protected]>, "
        "Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("ALSA SoC ZipitZ2");
MODULE_LICENSE("GPL");