mirror of https://gitee.com/openkylin/linux.git
159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
/*
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* omap-hdmi.c
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*
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* OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.
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* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
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* Authors: Jorge Candelaria <jorge.candelaria@ti.com>
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* Ricardo Neri <ricardo.neri@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <plat/dma.h>
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#include "omap-pcm.h"
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#include "omap-hdmi.h"
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#define DRV_NAME "hdmi-audio-dai"
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static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {
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.name = "HDMI playback",
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.sync_mode = OMAP_DMA_SYNC_PACKET,
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};
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static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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int err;
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/*
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* Make sure that the period bytes are multiple of the DMA packet size.
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* Largest packet size we use is 32 32-bit words = 128 bytes
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*/
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err = snd_pcm_hw_constraint_step(substream->runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
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if (err < 0)
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return err;
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return 0;
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}
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static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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int err = 0;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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omap_hdmi_dai_dma_params.packet_size = 16;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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omap_hdmi_dai_dma_params.packet_size = 32;
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break;
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default:
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err = -EINVAL;
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}
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omap_hdmi_dai_dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
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snd_soc_dai_set_dma_data(dai, substream,
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&omap_hdmi_dai_dma_params);
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return err;
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}
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static struct snd_soc_dai_ops omap_hdmi_dai_ops = {
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.startup = omap_hdmi_dai_startup,
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.hw_params = omap_hdmi_dai_hw_params,
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};
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static struct snd_soc_dai_driver omap_hdmi_dai = {
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = OMAP_HDMI_RATES,
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.formats = OMAP_HDMI_FORMATS,
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},
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.ops = &omap_hdmi_dai_ops,
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};
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static __devinit int omap_hdmi_probe(struct platform_device *pdev)
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{
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int ret;
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struct resource *hdmi_rsrc;
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hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!hdmi_rsrc) {
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dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
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return -EINVAL;
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}
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omap_hdmi_dai_dma_params.port_addr = hdmi_rsrc->start
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+ OMAP_HDMI_AUDIO_DMA_PORT;
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hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
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if (!hdmi_rsrc) {
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dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
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return -EINVAL;
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}
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omap_hdmi_dai_dma_params.dma_req = hdmi_rsrc->start;
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ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
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return ret;
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}
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static int __devexit omap_hdmi_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_dai(&pdev->dev);
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return 0;
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}
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static struct platform_driver hdmi_dai_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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.probe = omap_hdmi_probe,
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.remove = __devexit_p(omap_hdmi_remove),
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};
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static int __init hdmi_dai_init(void)
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{
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return platform_driver_register(&hdmi_dai_driver);
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}
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module_init(hdmi_dai_init);
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static void __exit hdmi_dai_exit(void)
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{
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platform_driver_unregister(&hdmi_dai_driver);
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}
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module_exit(hdmi_dai_exit);
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MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
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MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
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MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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