tegra_pcm.c
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/*
* tegra_pcm.c - Tegra PCM driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2010,2012 - NVIDIA, Inc.
*
* Based on code copyright/by:
*
* Copyright (c) 2009-2010, NVIDIA Corporation.
* Scott Peterson <speterson@nvidia.com>
* Vijay Mali <vmali@nvidia.com>
*
* Copyright (C) 2010 Google, Inc.
* Iliyan Malchev <malchev@google.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/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "tegra_pcm.h"
static const struct snd_pcm_hardware tegra_pcm_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED,
.period_bytes_min = 1024,
.period_bytes_max = PAGE_SIZE,
.periods_min = 2,
.periods_max = 8,
.buffer_bytes_max = PAGE_SIZE * 8,
.fifo_size = 4,
};
static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
.pcm_hardware = &tegra_pcm_hardware,
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
.prealloc_buffer_size = PAGE_SIZE * 8,
};
int tegra_pcm_platform_register(struct device *dev)
{
return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
int tegra_pcm_platform_register_with_chan_names(struct device *dev,
struct snd_dmaengine_pcm_config *config,
char *txdmachan, char *rxdmachan)
{
*config = tegra_dmaengine_pcm_config;
config->dma_dev = dev->parent;
config->chan_names[0] = txdmachan;
config->chan_names[1] = rxdmachan;
return snd_dmaengine_pcm_register(dev, config, 0);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
void tegra_pcm_platform_unregister(struct device *dev)
{
return snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra PCM ASoC driver");
MODULE_LICENSE("GPL");