ASoC: OMAP: Add CPU DAI driver for HDMI

/*

 * omap-hdmi.c

 *

 * OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.

 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/

 * Authors: Jorge Candelaria <jorge.candelaria@ti.com>

 *          Ricardo Neri <ricardo.neri@ti.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 <linux/init.h>

#include <linux/module.h>

#include <linux/device.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/initval.h>

#include <sound/soc.h>

#include <plat/dma.h>

#include "omap-pcm.h"

#include "omap-hdmi.h"

#define DRV_NAME "hdmi-audio-dai"

static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {

	.name = "HDMI playback",

	.sync_mode = OMAP_DMA_SYNC_PACKET,

};

static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,

				  struct snd_soc_dai *dai)

{

	int err;

	/*

	 * Make sure that the period bytes are multiple of the DMA packet size.

	 * Largest packet size we use is 32 32-bit words = 128 bytes

	 */

	err = snd_pcm_hw_constraint_step(substream->runtime, 0,

				 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);

	if (err < 0)

		return err;

	return 0;

}

static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,

				    struct snd_pcm_hw_params *params,

				    struct snd_soc_dai *dai)

{

	int err = 0;

	switch (params_format(params)) {

	case SNDRV_PCM_FORMAT_S16_LE:

		omap_hdmi_dai_dma_params.packet_size = 16;

		break;

	case SNDRV_PCM_FORMAT_S24_LE:

		omap_hdmi_dai_dma_params.packet_size = 32;

		break;

	default:

		err = -EINVAL;

	}

	omap_hdmi_dai_dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;

	snd_soc_dai_set_dma_data(dai, substream,

				 &omap_hdmi_dai_dma_params);

	return err;

}

static struct snd_soc_dai_ops omap_hdmi_dai_ops = {

	.startup	= omap_hdmi_dai_startup,

	.hw_params	= omap_hdmi_dai_hw_params,

};

static struct snd_soc_dai_driver omap_hdmi_dai = {

	.playback = {

		.channels_min = 2,

		.channels_max = 2,

		.rates = OMAP_HDMI_RATES,

		.formats = OMAP_HDMI_FORMATS,

	},

	.ops = &omap_hdmi_dai_ops,

};

static __devinit int omap_hdmi_probe(struct platform_device *pdev)

{

	int ret;

	struct resource *hdmi_rsrc;

	hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!hdmi_rsrc) {

		dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");

		return -EINVAL;

	}

	omap_hdmi_dai_dma_params.port_addr =  hdmi_rsrc->start

		+ OMAP_HDMI_AUDIO_DMA_PORT;

	hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);

	if (!hdmi_rsrc) {

		dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");

		return -EINVAL;

	}

	omap_hdmi_dai_dma_params.dma_req =  hdmi_rsrc->start;

	ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);

	return ret;

}

static int __devexit omap_hdmi_remove(struct platform_device *pdev)

{

	snd_soc_unregister_dai(&pdev->dev);

	return 0;

}

static struct platform_driver hdmi_dai_driver = {

	.driver = {

		.name = DRV_NAME,

		.owner = THIS_MODULE,

	},

	.probe = omap_hdmi_probe,

	.remove = __devexit_p(omap_hdmi_remove),

};

static int __init hdmi_dai_init(void)

{

	return platform_driver_register(&hdmi_dai_driver);

}

module_init(hdmi_dai_init);

static void __exit hdmi_dai_exit(void)

{

	platform_driver_unregister(&hdmi_dai_driver);

}

module_exit(hdmi_dai_exit);

MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");

MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");

MODULE_DESCRIPTION("OMAP HDMI SoC Interface");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:" DRV_NAME);

/*

 * omap-hdmi.h

 *

 * Definitions for OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.

 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/

 * Authors: Jorge Candelaria <jorge.candelaria@ti.com>

 *          Ricardo Neri <ricardo.neri@ti.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

 *

 */

#ifndef __OMAP_HDMI_H__

#define __OMAP_HDMI_H__

#define OMAP_HDMI_AUDIO_DMA_PORT 0x8c

#define OMAP_HDMI_RATES	(SNDRV_PCM_RATE_32000 | \

				SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)

#define OMAP_HDMI_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \

				SNDRV_PCM_FMTBIT_S24_LE)

#endif