LXR linux/sound/soc/fsl/imx-pcm-dma.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
   4 *
   5 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   6 *
   7 * This code is based on code copyrighted by Freescale,
   8 * Liam Girdwood, Javier Martin and probably others.
   9 */
  10#include <linux/platform_device.h>
  11#include <linux/dmaengine.h>
  12#include <linux/types.h>
  13#include <linux/module.h>
  14
  15#include <sound/core.h>
  16#include <sound/pcm.h>
  17#include <sound/soc.h>
  18#include <sound/dmaengine_pcm.h>
  19
  20#include "imx-pcm.h"
  21
  22static bool filter(struct dma_chan *chan, void *param)
  23{
  24        if (!imx_dma_is_general_purpose(chan))
  25                return false;
  26
  27        chan->private = param;
  28
  29        return true;
  30}
  31
  32static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
  33        .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  34        .compat_filter_fn = filter,
  35};
  36
  37int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
  38{
  39        struct snd_dmaengine_pcm_config *config;
  40
  41        config = devm_kzalloc(&pdev->dev,
  42                        sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
  43        if (!config)
  44                return -ENOMEM;
  45        *config = imx_dmaengine_pcm_config;
  46
  47        return devm_snd_dmaengine_pcm_register(&pdev->dev,
  48                config,
  49                SND_DMAENGINE_PCM_FLAG_COMPAT);
  50}
  51EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
  52
  53MODULE_LICENSE("GPL");
  54