LXR linux/sound/soc/samsung/dmaengine.c

   1/*
   2 * dmaengine.c - Samsung dmaengine wrapper
   3 *
   4 * Author: Mark Brown <broonie@linaro.org>
   5 * Copyright 2013 Linaro
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * version 2 as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * General Public License for more details.
  15 *
  16 */
  17
  18#include <linux/module.h>
  19#include <sound/core.h>
  20#include <sound/pcm.h>
  21#include <sound/pcm_params.h>
  22#include <sound/dmaengine_pcm.h>
  23#include <sound/soc.h>
  24
  25#include "dma.h"
  26
  27int samsung_asoc_dma_platform_register(struct device *dev, dma_filter_fn filter,
  28                                       const char *tx, const char *rx)
  29{
  30        unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT;
  31        struct snd_dmaengine_pcm_config *pcm_conf;
  32
  33        pcm_conf = devm_kzalloc(dev, sizeof(*pcm_conf), GFP_KERNEL);
  34        if (!pcm_conf)
  35                return -ENOMEM;
  36
  37        pcm_conf->prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
  38        pcm_conf->compat_filter_fn = filter;
  39
  40        if (dev->of_node) {
  41                pcm_conf->chan_names[SNDRV_PCM_STREAM_PLAYBACK] = tx;
  42                pcm_conf->chan_names[SNDRV_PCM_STREAM_CAPTURE] = rx;
  43        } else {
  44                flags |= SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME;
  45        }
  46
  47        return devm_snd_dmaengine_pcm_register(dev, pcm_conf, flags);
  48}
  49EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
  50
  51MODULE_AUTHOR("Mark Brown <broonie@linaro.org>");
  52MODULE_DESCRIPTION("Samsung dmaengine ASoC driver");
  53MODULE_LICENSE("GPL");
  54