sound/soc/omap/omap-hdmi.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <sound/asound.h>
 #include <sound/asoundef.h>
 #include <video/omapdss.h>

 #include "omap-pcm.h"
 #include "omap-hdmi.h"

 #define DRV_NAME "omap-hdmi-audio-dai"

 struct hdmi_priv {
 	struct omap_pcm_dma_data dma_params;
 	struct omap_dss_audio dss_audio;
 	struct snd_aes_iec958 iec;
 	struct snd_cea_861_aud_if cea;
 	struct omap_dss_device *dssdev;
 };

 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
 				  struct snd_soc_dai *dai)
 {
 	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(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) {
 		dev_err(dai->dev, "could not apply constraint\n");
 		return err;
 	}

 	if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
 		dev_err(dai->dev, "audio not supported\n");
 		return -ENODEV;
 	}

 	snd_soc_dai_set_dma_data(dai, substream, &priv->dma_params);

 	return 0;
 }

 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
 	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);

 	return priv->dssdev->driver->audio_enable(priv->dssdev);
 }

 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 				    struct snd_pcm_hw_params *params,
 				    struct snd_soc_dai *dai)
 {
 	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 	struct snd_aes_iec958 *iec = &priv->iec;
 	struct snd_cea_861_aud_if *cea = &priv->cea;
 	struct omap_pcm_dma_data *dma_data;
 	int err = 0;

 	dma_data = snd_soc_dai_get_dma_data(dai, substream);

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		dma_data->packet_size = 16;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		dma_data->packet_size = 32;
 		break;
 	default:
 		dev_err(dai->dev, "format not supported!\n");
 		return -EINVAL;
 	}

 	dma_data->data_type = 32;

 	/*
 	 * fill the IEC-60958 channel status word
 	 */
 	/* initialize the word bytes */
 	memset(iec->status, 0, sizeof(iec->status));

 	/* specify IEC-60958-3 (commercial use) */
 	iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;

 	/* specify that the audio is LPCM*/
 	iec->status[0] &= ~IEC958_AES0_NONAUDIO;

 	iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;

 	iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;

 	iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;

 	iec->status[1] = IEC958_AES1_CON_GENERAL;

 	iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;

 	iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;

 	switch (params_rate(params)) {
 	case 32000:
 		iec->status[3] |= IEC958_AES3_CON_FS_32000;
 		break;
 	case 44100:
 		iec->status[3] |= IEC958_AES3_CON_FS_44100;
 		break;
 	case 48000:
 		iec->status[3] |= IEC958_AES3_CON_FS_48000;
 		break;
 	case 88200:
 		iec->status[3] |= IEC958_AES3_CON_FS_88200;
 		break;
 	case 96000:
 		iec->status[3] |= IEC958_AES3_CON_FS_96000;
 		break;
 	case 176400:
 		iec->status[3] |= IEC958_AES3_CON_FS_176400;
 		break;
 	case 192000:
 		iec->status[3] |= IEC958_AES3_CON_FS_192000;
 		break;
 	default:
 		dev_err(dai->dev, "rate not supported!\n");
 		return -EINVAL;
 	}

 	/* specify the clock accuracy */
 	iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;

 	/*
 	 * specify the word length. The same word length value can mean
 	 * two different lengths. Hence, we need to specify the maximum
 	 * word length as well.
 	 */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 		iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 		iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 		break;
 	default:
 		dev_err(dai->dev, "format not supported!\n");
 		return -EINVAL;
 	}

 	/*
 	 * Fill the CEA-861 audio infoframe (see spec for details)
 	 */

 	cea->db1_ct_cc = (params_channels(params) - 1)
 		& CEA861_AUDIO_INFOFRAME_DB1CC;
 	cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;

 	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 	cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;

 	cea->db3 = 0; /* not used, all zeros */

 	/*
 	 * The OMAP HDMI IP requires to use the 8-channel channel code when
 	 * transmitting more than two channels.
 	 */
 	if (params_channels(params) == 2)
 		cea->db4_ca = 0x0;
 	else
 		cea->db4_ca = 0x13;

 	cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 	/* the expression is trivial but makes clear what we are doing */
 	cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);

 	priv->dss_audio.iec = iec;
 	priv->dss_audio.cea = cea;

 	err = priv->dssdev->driver->audio_config(priv->dssdev,
 						 &priv->dss_audio);

 	return err;
 }

 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 				struct snd_soc_dai *dai)
 {
 	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 	int err = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		err = priv->dssdev->driver->audio_start(priv->dssdev);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		priv->dssdev->driver->audio_stop(priv->dssdev);
 		break;
 	default:
 		err = -EINVAL;
 	}
 	return err;
 }

 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
 	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);

 	priv->dssdev->driver->audio_disable(priv->dssdev);
 }

 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
 	.startup	= omap_hdmi_dai_startup,
 	.hw_params	= omap_hdmi_dai_hw_params,
 	.prepare	= omap_hdmi_dai_prepare,
 	.trigger	= omap_hdmi_dai_trigger,
 	.shutdown	= omap_hdmi_dai_shutdown,
 };

 static struct snd_soc_dai_driver omap_hdmi_dai = {
 	.playback = {
 		.channels_min = 2,
 		.channels_max = 8,
 		.rates = OMAP_HDMI_RATES,
 		.formats = OMAP_HDMI_FORMATS,
 	},
 	.ops = &omap_hdmi_dai_ops,
 };

 static int omap_hdmi_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct resource *hdmi_rsrc;
 	struct hdmi_priv *hdmi_data;
 	bool hdmi_dev_found = false;

 	hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
 	if (hdmi_data == NULL) {
 		dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
 		return -ENOMEM;
 	}

 	hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!hdmi_rsrc) {
 		dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
 		return -ENODEV;
 	}

 	hdmi_data->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 -ENODEV;
 	}

 	hdmi_data->dma_params.dma_req =  hdmi_rsrc->start;
 	hdmi_data->dma_params.name = "HDMI playback";

 	/*
 	 * TODO: We assume that there is only one DSS HDMI device. Future
 	 * OMAP implementations may support more than one HDMI devices and
 	 * we should provided separate audio support for all of them.
 	 */
 	/* Find an HDMI device. */
 	for_each_dss_dev(hdmi_data->dssdev) {
 		omap_dss_get_device(hdmi_data->dssdev);

 		if (!hdmi_data->dssdev->driver) {
 			omap_dss_put_device(hdmi_data->dssdev);
 			continue;
 		}

 		if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
 			hdmi_dev_found = true;
 			break;
 		}
 	}

 	if (!hdmi_dev_found) {
 		dev_err(&pdev->dev, "no driver for HDMI display found\n");
 		return -ENODEV;
 	}

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

 	return ret;
 }

 static int omap_hdmi_remove(struct platform_device *pdev)
 {
 	struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);

 	snd_soc_unregister_dai(&pdev->dev);

 	if (hdmi_data == NULL) {
 		dev_err(&pdev->dev, "cannot obtain HDMi data\n");
 		return -ENODEV;
 	}

 	omap_dss_put_device(hdmi_data->dssdev);
 	return 0;
 }

 static struct platform_driver hdmi_dai_driver = {
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
 	},
 	.probe = omap_hdmi_probe,
 	.remove = omap_hdmi_remove,
 };

 module_platform_driver(hdmi_dai_driver);

 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.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 <sound/asound.h>
	#include <sound/asoundef.h>
	#include <video/omapdss.h>

	#include "omap-pcm.h"
	#include "omap-hdmi.h"

	#define DRV_NAME "omap-hdmi-audio-dai"

	struct hdmi_priv {
	struct omap_pcm_dma_data dma_params;
	struct omap_dss_audio dss_audio;
	struct snd_aes_iec958 iec;
	struct snd_cea_861_aud_if cea;
	struct omap_dss_device *dssdev;
	};

	static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(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) {
	dev_err(dai->dev, "could not apply constraint\n");
	return err;
	}

	if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
	dev_err(dai->dev, "audio not supported\n");
	return -ENODEV;
	}

	snd_soc_dai_set_dma_data(dai, substream, &priv->dma_params);

	return 0;
	}

	static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);

	return priv->dssdev->driver->audio_enable(priv->dssdev);
	}

	static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
	struct snd_aes_iec958 *iec = &priv->iec;
	struct snd_cea_861_aud_if *cea = &priv->cea;
	struct omap_pcm_dma_data *dma_data;
	int err = 0;

	dma_data = snd_soc_dai_get_dma_data(dai, substream);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	dma_data->packet_size = 16;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	dma_data->packet_size = 32;
	break;
	default:
	dev_err(dai->dev, "format not supported!\n");
	return -EINVAL;
	}

	dma_data->data_type = 32;

	/*
	* fill the IEC-60958 channel status word
	*/
	/* initialize the word bytes */
	memset(iec->status, 0, sizeof(iec->status));

	/* specify IEC-60958-3 (commercial use) */
	iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;

	/* specify that the audio is LPCM*/
	iec->status[0] &= ~IEC958_AES0_NONAUDIO;

	iec->status[0] \|= IEC958_AES0_CON_NOT_COPYRIGHT;

	iec->status[0] \|= IEC958_AES0_CON_EMPHASIS_NONE;

	iec->status[0] \|= IEC958_AES1_PRO_MODE_NOTID;

	iec->status[1] = IEC958_AES1_CON_GENERAL;

	iec->status[2] \|= IEC958_AES2_CON_SOURCE_UNSPEC;

	iec->status[2] \|= IEC958_AES2_CON_CHANNEL_UNSPEC;

	switch (params_rate(params)) {
	case 32000:
	iec->status[3] \|= IEC958_AES3_CON_FS_32000;
	break;
	case 44100:
	iec->status[3] \|= IEC958_AES3_CON_FS_44100;
	break;
	case 48000:
	iec->status[3] \|= IEC958_AES3_CON_FS_48000;
	break;
	case 88200:
	iec->status[3] \|= IEC958_AES3_CON_FS_88200;
	break;
	case 96000:
	iec->status[3] \|= IEC958_AES3_CON_FS_96000;
	break;
	case 176400:
	iec->status[3] \|= IEC958_AES3_CON_FS_176400;
	break;
	case 192000:
	iec->status[3] \|= IEC958_AES3_CON_FS_192000;
	break;
	default:
	dev_err(dai->dev, "rate not supported!\n");
	return -EINVAL;
	}

	/* specify the clock accuracy */
	iec->status[3] \|= IEC958_AES3_CON_CLOCK_1000PPM;

	/*
	* specify the word length. The same word length value can mean
	* two different lengths. Hence, we need to specify the maximum
	* word length as well.
	*/
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	iec->status[4] \|= IEC958_AES4_CON_WORDLEN_20_16;
	iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	iec->status[4] \|= IEC958_AES4_CON_WORDLEN_24_20;
	iec->status[4] \|= IEC958_AES4_CON_MAX_WORDLEN_24;
	break;
	default:
	dev_err(dai->dev, "format not supported!\n");
	return -EINVAL;
	}

	/*
	* Fill the CEA-861 audio infoframe (see spec for details)
	*/

	cea->db1_ct_cc = (params_channels(params) - 1)
	& CEA861_AUDIO_INFOFRAME_DB1CC;
	cea->db1_ct_cc \|= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;

	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
	cea->db2_sf_ss \|= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;

	cea->db3 = 0; /* not used, all zeros */

	/*
	* The OMAP HDMI IP requires to use the 8-channel channel code when
	* transmitting more than two channels.
	*/
	if (params_channels(params) == 2)
	cea->db4_ca = 0x0;
	else
	cea->db4_ca = 0x13;

	cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
	/* the expression is trivial but makes clear what we are doing */
	cea->db5_dminh_lsv \|= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);

	priv->dss_audio.iec = iec;
	priv->dss_audio.cea = cea;

	err = priv->dssdev->driver->audio_config(priv->dssdev,
	&priv->dss_audio);

	return err;
	}

	static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
	int err = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	err = priv->dssdev->driver->audio_start(priv->dssdev);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	priv->dssdev->driver->audio_stop(priv->dssdev);
	break;
	default:
	err = -EINVAL;
	}
	return err;
	}

	static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);

	priv->dssdev->driver->audio_disable(priv->dssdev);
	}

	static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
	.startup = omap_hdmi_dai_startup,
	.hw_params = omap_hdmi_dai_hw_params,
	.prepare = omap_hdmi_dai_prepare,
	.trigger = omap_hdmi_dai_trigger,
	.shutdown = omap_hdmi_dai_shutdown,
	};

	static struct snd_soc_dai_driver omap_hdmi_dai = {
	.playback = {
	.channels_min = 2,
	.channels_max = 8,
	.rates = OMAP_HDMI_RATES,
	.formats = OMAP_HDMI_FORMATS,
	},
	.ops = &omap_hdmi_dai_ops,
	};

	static int omap_hdmi_probe(struct platform_device *pdev)
	{
	int ret;
	struct resource *hdmi_rsrc;
	struct hdmi_priv *hdmi_data;
	bool hdmi_dev_found = false;

	hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
	if (hdmi_data == NULL) {
	dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
	return -ENOMEM;
	}

	hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!hdmi_rsrc) {
	dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
	return -ENODEV;
	}

	hdmi_data->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 -ENODEV;
	}

	hdmi_data->dma_params.dma_req = hdmi_rsrc->start;
	hdmi_data->dma_params.name = "HDMI playback";

	/*
	* TODO: We assume that there is only one DSS HDMI device. Future
	* OMAP implementations may support more than one HDMI devices and
	* we should provided separate audio support for all of them.
	*/
	/* Find an HDMI device. */
	for_each_dss_dev(hdmi_data->dssdev) {
	omap_dss_get_device(hdmi_data->dssdev);

	if (!hdmi_data->dssdev->driver) {
	omap_dss_put_device(hdmi_data->dssdev);
	continue;
	}

	if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
	hdmi_dev_found = true;
	break;
	}
	}

	if (!hdmi_dev_found) {
	dev_err(&pdev->dev, "no driver for HDMI display found\n");
	return -ENODEV;
	}

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

	return ret;
	}

	static int omap_hdmi_remove(struct platform_device *pdev)
	{
	struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);

	if (hdmi_data == NULL) {
	dev_err(&pdev->dev, "cannot obtain HDMi data\n");
	return -ENODEV;
	}

	omap_dss_put_device(hdmi_data->dssdev);
	return 0;
	}

	static struct platform_driver hdmi_dai_driver = {
	.driver = {
	.name = DRV_NAME,
	.owner = THIS_MODULE,
	},
	.probe = omap_hdmi_probe,
	.remove = omap_hdmi_remove,
	};

	module_platform_driver(hdmi_dai_driver);

	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);