sound/soc/omap/omap4-hdmi-card.c

/*
 * omap4-hdmi-card.c
 *
 * OMAP ALSA SoC machine driver for TI OMAP4 HDMI
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 * Author: 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/module.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <asm/mach-types.h>
#include <video/omapdss.h>

#define DRV_NAME "omap4-hdmi-audio"

static int omap4_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params)
{
	int i, count = 0;
	struct omap_overlay_manager *mgr = NULL;
	struct device *dev = substream->pcm->card->dev;

	/* Find DSS HDMI device */
	for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
		mgr = omap_dss_get_overlay_manager(i);
		if (mgr && mgr->device
			&& mgr->device->type == OMAP_DISPLAY_TYPE_HDMI)
			break;
	}

	if (i == omap_dss_get_num_overlay_managers()) {
		dev_err(dev, "HDMI display device not found!\n");
		return -ENODEV;
	}

	/* Make sure HDMI is power-on to avoid L3 interconnect errors */
	while (mgr->device->state != OMAP_DSS_DISPLAY_ACTIVE) {
		msleep(50);
		if (count > 5)
			return -EIO;
		dev_err(dev, "HDMI display is not active!\n");
		count++;
	}

	return 0;
}

static struct snd_soc_ops omap4_hdmi_dai_ops = {
	.hw_params = omap4_hdmi_dai_hw_params,
};

#define OMAP4_HDMI_SND_DEV_ID 1

static struct snd_soc_dai_link omap4_hdmi_dai = {
	.name = "HDMI",
	.stream_name = "HDMI",
	.cpu_dai_name = "hdmi-audio-dai",
	.platform_name = "omap-pcm-audio",
	.codec_name = "omap-hdmi-codec",
	.codec_dai_name = "hdmi-audio-codec",
	.ops = &omap4_hdmi_dai_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_omap4_hdmi = {
	.name = "SDP4430HDMI",
	.long_name = "TI OMAP4 HDMI Board",
	.dai_link = &omap4_hdmi_dai,
	.num_links = 1,
};

static struct snd_soc_dai_driver dai[] = {
{
	.name = "HDMI",
	.playback = {
		.stream_name = "HDMI Playback",
		.channels_min = 2,
		.channels_max = 8,
		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
},
};

static struct platform_device *omap4_hdmi_snd_device;

static int __init omap4_hdmi_soc_init(void)
{
	int ret;

	if (!(machine_is_omap_4430sdp() || machine_is_omap4_panda()))
		return -ENODEV;
	printk(KERN_INFO "OMAP4 HDMI audio SoC init\n");

	if (machine_is_omap4_panda())
		snd_soc_omap4_hdmi.name = "PandaHDMI";

	omap4_hdmi_snd_device = platform_device_alloc("soc-audio",
		OMAP4_HDMI_SND_DEV_ID);
	if (!omap4_hdmi_snd_device) {
		printk(KERN_ERR "Platform device allocation failed\n");
		return -ENOMEM;
	}

	ret = snd_soc_register_dais(&omap4_hdmi_snd_device->dev, dai, ARRAY_SIZE(dai));
	if (ret < 0)
		goto err;
	platform_set_drvdata(omap4_hdmi_snd_device, &snd_soc_omap4_hdmi);

	ret = platform_device_add(omap4_hdmi_snd_device);
	if (ret)
		goto err;

	return 0;
err:
	printk(KERN_ERR "Unable to add platform device\n");
	platform_device_put(omap4_hdmi_snd_device);
	return ret;
}
module_init(omap4_hdmi_soc_init);

static void __exit omap4_hdmi_soc_exit(void)
{
	platform_device_unregister(omap4_hdmi_snd_device);
}
module_exit(omap4_hdmi_soc_exit);

MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
MODULE_DESCRIPTION("ALSA SoC OMAP4 HDMI AUDIO");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);