diff options
Diffstat (limited to 'sound/soc/omap/omap-hdmi.c')
| -rw-r--r-- | sound/soc/omap/omap-hdmi.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sound/soc/omap/omap-hdmi.c b/sound/soc/omap/omap-hdmi.c new file mode 100644 index 000000000000..36c6eaeffb02 --- /dev/null +++ b/sound/soc/omap/omap-hdmi.c @@ -0,0 +1,158 @@ +/* + * 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); |