Quelle  udma-pcm.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com
 *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
 */

#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 "udma-pcm.h"

static const struct snd_pcm_hardware udma_pcm_hardware = {
 .info   = SNDRV_PCM_INFO_MMAP |
      SNDRV_PCM_INFO_MMAP_VALID |
      SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
      SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
      SNDRV_PCM_INFO_INTERLEAVED,
 .buffer_bytes_max = SIZE_MAX,
 .period_bytes_min = 32,
 .period_bytes_max = SZ_64K,
 .periods_min  = 2,
 .periods_max  = UINT_MAX,
};

static const struct snd_dmaengine_pcm_config udma_dmaengine_pcm_config = {
 .pcm_hardware = &udma_pcm_hardware,
 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
};

int udma_pcm_platform_register(struct device *dev)
{
 return devm_snd_dmaengine_pcm_register(dev, &udma_dmaengine_pcm_config,
            0);
}
EXPORT_SYMBOL_GPL(udma_pcm_platform_register);

MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
MODULE_DESCRIPTION("UDMA PCM ASoC platform driver");
MODULE_LICENSE("GPL v2");