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z2.c

/*
 * linux/sound/soc/pxa/z2.c
 *
 * SoC Audio driver for Aeronix Zipit Z2
 *
 * Copyright (C) 2009 Ken McGuire <kenm@desertweyr.com>
 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
 *
 * 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/soc-dapm.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-pcm.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->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->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 codec DAI configuration */
      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* set cpu DAI configuration */
      ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* 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,
      },
};

/* 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,
      },
};

/* 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 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_codec *codec)
{
      int ret;

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

      /* Add z2 specific widgets */
      snd_soc_dapm_new_controls(codec, wm8750_dapm_widgets,
                         ARRAY_SIZE(wm8750_dapm_widgets));

      /* Set up z2 specific audio paths */
      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

      ret = snd_soc_dapm_sync(codec);
      if (ret)
            goto err;

      /* Jack detection API stuff */
      ret = snd_soc_jack_new(&snd_soc_z2, "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    = &pxa_i2s_dai,
      .codec_dai  = &wm8750_dai,
      .init       = z2_wm8750_init,
      .ops        = &z2_ops,
};

/* z2 audio machine driver */
static struct snd_soc_card snd_soc_z2 = {
      .name       = "Z2",
      .platform   = &pxa2xx_soc_platform,
      .dai_link   = &z2_dai,
      .num_links  = 1,
};

/* z2 audio subsystem */
static struct snd_soc_device z2_snd_devdata = {
      .card       = &snd_soc_z2,
      .codec_dev  = &soc_codec_dev_wm8750,
};

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, &z2_snd_devdata);
      z2_snd_devdata.dev = &z2_snd_device->dev;
      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 <kenm@desertweyr.com>, "
            "Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("ALSA SoC ZipitZ2");
MODULE_LICENSE("GPL");

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