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/*
* 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 "omap-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 const 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 -ENODEV;
}
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 -ENODEV;
}
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),
};
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);
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