ep93xx-pcm.c
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/*
* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
*
* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
* Copyright (C) 2006 Applied Data Systems
*
* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
* Copyright (c) 2008 Ryan Mallon
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include <linux/platform_data/dma-ep93xx.h>
#include "ep93xx-pcm.h"
static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER),
.buffer_bytes_max = 131072,
.period_bytes_min = 32,
.period_bytes_max = 32768,
.periods_min = 1,
.periods_max = 32,
.fifo_size = 32,
};
static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
{
struct ep93xx_dma_data *data = filter_param;
if (data->direction == ep93xx_dma_chan_direction(chan)) {
chan->private = data;
return true;
}
return false;
}
static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
.pcm_hardware = &ep93xx_pcm_hardware,
.compat_filter_fn = ep93xx_pcm_dma_filter,
.prealloc_buffer_size = 131072,
};
int devm_ep93xx_pcm_platform_register(struct device *dev)
{
return devm_snd_dmaengine_pcm_register(dev,
&ep93xx_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
MODULE_AUTHOR("Ryan Mallon");
MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
MODULE_LICENSE("GPL");