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/*
* Xilinx DisplayPort Sound PCM support
*
* Copyright (C) 2015 Xilinx, Inc.
*
* Author: Hyun Woo Kwon <hyunk@xilinx.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/soc.h>
static const struct snd_pcm_hardware xilinx_pcm_hw = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 256,
.period_bytes_max = 1024 * 1024,
.periods_min = 2,
.periods_max = 256,
};
static const struct snd_dmaengine_pcm_config xilinx_dmaengine_pcm_config = {
.pcm_hardware = &xilinx_pcm_hw,
.prealloc_buffer_size = 64 * 1024,
};
static int xilinx_dp_pcm_probe(struct platform_device *pdev)
{
int ret;
dev_set_name(&pdev->dev, pdev->dev.of_node->name);
ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
&xilinx_dmaengine_pcm_config, 0);
if (ret)
return ret;
dev_info(&pdev->dev, "Xilinx DisplayPort Sound PCM probed\n");
return 0;
}
static const struct of_device_id xilinx_dp_pcm_of_match[] = {
{ .compatible = "xlnx,dp-snd-pcm", },
{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, xilinx_dp_pcm_of_match);
static struct platform_driver xilinx_dp_pcm_driver = {
.driver = {
.name = "xilinx-dp-snd-pcm",
.of_match_table = xilinx_dp_pcm_of_match,
},
.probe = xilinx_dp_pcm_probe,
};
module_platform_driver(xilinx_dp_pcm_driver);
MODULE_DESCRIPTION("Xilinx DisplayPort Sound PCM module");
MODULE_LICENSE("GPL v2");
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