Quelle  mxs-pcm.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Based on sound/soc/imx/imx-pcm-dma-mx2.c
 */

#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,
 .period_bytes_min = 32,
 .period_bytes_max = 8192,
 .periods_min  = 1,
 .periods_max  = 52,
 .buffer_bytes_max = 64 * 1024,
 .fifo_size  = 32,
};

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

int mxs_pcm_platform_register(struct device *dev)
{
 return devm_snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
  SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
}
EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);

MODULE_DESCRIPTION("MXS ASoC PCM driver");
MODULE_LICENSE("GPL");