sound/soc/mxs/mxs-pcm.c

/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Based on sound/soc/imx/imx-pcm-dma-mx2.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/module.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>

#include "mxs-pcm.h"

static const struct snd_pcm_hardware snd_mxs_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_HALF_DUPLEX,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
				  SNDRV_PCM_FMTBIT_S20_3LE |
				  SNDRV_PCM_FMTBIT_S24_LE,
	.channels_min		= 2,
	.channels_max		= 2,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192,
	.periods_min		= 1,
	.periods_max		= 52,
	.buffer_bytes_max	= 64 * 1024,
	.fifo_size		= 32,
};

static bool filter(struct dma_chan *chan, void *param)
{
	struct mxs_pcm_dma_params *dma_params = param;

	if (!mxs_dma_is_apbx(chan))
		return false;

	if (chan->chan_id != dma_params->chan_num)
		return false;

	chan->private = &dma_params->dma_data;

	return true;
}

static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
	.pcm_hardware = &snd_mxs_hardware,
	.compat_filter_fn = filter,
	.prealloc_buffer_size = 64 * 1024,
};

int mxs_pcm_platform_register(struct device *dev)
{
	return snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
		SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
		SND_DMAENGINE_PCM_FLAG_NO_DT |
		SND_DMAENGINE_PCM_FLAG_COMPAT |
		SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
}
EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);

void mxs_pcm_platform_unregister(struct device *dev)
{
	snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL_GPL(mxs_pcm_platform_unregister);

MODULE_LICENSE("GPL");