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harmony.c

/*
 * harmony.c - Harmony machine ASoC driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * Based on code copyright/by:
 *
 * (c) 2009, 2010 Nvidia Graphics Pvt. Ltd.
 *
 * Copyright 2007 Wolfson Microelectronics PLC.
 * Author: Graeme Gregory
 *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.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.
 *
 * 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 <asm/mach-types.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "tegra_das.h"
#include "tegra_i2s.h"
#include "tegra_pcm.h"
#include "tegra_asoc_utils.h"

#define PREFIX "ASoC Harmony: "

static struct platform_device *harmony_snd_device;

static int harmony_asoc_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 srate, mclk, mclk_change;
      int err;

      srate = params_rate(params);
      switch (srate) {
      case 64000:
      case 88200:
      case 96000:
            mclk = 128 * srate;
            break;
      default:
            mclk = 256 * srate;
            break;
      }
      /* FIXME: Codec only requires >= 3MHz if OSR==0 */
      while (mclk < 6000000)
            mclk *= 2;

      err = tegra_asoc_utils_set_rate(srate, mclk, &mclk_change);
      if (err < 0) {
            pr_err(PREFIX "Can't configure clocks\n");
            return err;
      }

      err = snd_soc_dai_set_fmt(codec_dai,
                              SND_SOC_DAIFMT_I2S |
                              SND_SOC_DAIFMT_NB_NF |
                              SND_SOC_DAIFMT_CBS_CFS);
      if (err < 0) {
            pr_err(PREFIX "codec_dai fmt not set\n");
            return err;
      }

      err = snd_soc_dai_set_fmt(cpu_dai,
                              SND_SOC_DAIFMT_I2S |
                              SND_SOC_DAIFMT_NB_NF |
                              SND_SOC_DAIFMT_CBS_CFS);
      if (err < 0) {
            pr_err(PREFIX "cpu_dai fmt not set\n");
            return err;
      }

      if (mclk_change) {
          err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk, SND_SOC_CLOCK_IN);
          if (err < 0) {
                pr_err(PREFIX "codec_dai clock not set\n");
                return err;
          }
      }

      return 0;
}

static struct snd_soc_ops harmony_asoc_ops = {
      .hw_params = harmony_asoc_hw_params,
};

static const struct snd_soc_dapm_widget harmony_dapm_widgets[] = {
      SND_SOC_DAPM_HP("Headphone Jack", NULL),
      SND_SOC_DAPM_MIC("Mic Jack", NULL),
};

static const struct snd_soc_dapm_route harmony_audio_map[] = {
      {"Headphone Jack", NULL, "HPOUTR"},
      {"Headphone Jack", NULL, "HPOUTL"},
      {"Mic Bias", NULL, "Mic Jack"},
      {"IN1L", NULL, "Mic Bias"},
};

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

      snd_soc_dapm_new_controls(dapm, harmony_dapm_widgets,
                              ARRAY_SIZE(harmony_dapm_widgets));

      snd_soc_dapm_add_routes(dapm, harmony_audio_map,
                        ARRAY_SIZE(harmony_audio_map));

      snd_soc_dapm_enable_pin(dapm, "Headphone Jack");
      snd_soc_dapm_enable_pin(dapm, "Mic Jack");
      snd_soc_dapm_sync(dapm);

      return 0;
}

static struct snd_soc_dai_link harmony_wm8903_dai = {
      .name = "WM8903",
      .stream_name = "WM8903 PCM",
      .codec_name = "wm8903-codec.0-001a",
      .platform_name = "tegra-pcm-audio",
      .cpu_dai_name = "tegra-i2s.0",
      .codec_dai_name = "wm8903-hifi",
      .init = harmony_asoc_init,
      .ops = &harmony_asoc_ops,
};

static struct snd_soc_card snd_soc_harmony = {
      .name = "tegra-harmony",
      .dai_link = &harmony_wm8903_dai,
      .num_links = 1,
};

static int __init harmony_soc_modinit(void)
{
      int ret;

      if (!machine_is_harmony()) {
            pr_err(PREFIX "Not running on Tegra Harmony!\n");
            return -ENODEV;
      }

      ret = tegra_asoc_utils_init();
      if (ret) {
            return ret;
      }

      /*
       * Create and register platform device
       */
      harmony_snd_device = platform_device_alloc("soc-audio", -1);
      if (harmony_snd_device == NULL) {
            pr_err(PREFIX "platform_device_alloc failed\n");
            ret = -ENOMEM;
            goto err_clock_utils;
      }

      platform_set_drvdata(harmony_snd_device, &snd_soc_harmony);

      ret = platform_device_add(harmony_snd_device);
      if (ret) {
            pr_err(PREFIX "platform_device_add failed (%d)\n",
                  ret);
            goto err_device_put;
      }

      return 0;

err_device_put:
      platform_device_put(harmony_snd_device);
err_clock_utils:
      tegra_asoc_utils_fini();
      return ret;
}
module_init(harmony_soc_modinit);

static void __exit harmony_soc_modexit(void)
{
      platform_device_unregister(harmony_snd_device);

      tegra_asoc_utils_fini();
}
module_exit(harmony_soc_modexit);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Harmony machine ASoC driver");
MODULE_LICENSE("GPL");

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