ASoC: tegra: Harmony machine support

/*

 * 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 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",

	.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");