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 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");