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
  27 int 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 }
  49 EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
  50
  51 MODULE_AUTHOR("Mark Brown <broonie@linaro.org>");
  52 MODULE_DESCRIPTION("Samsung dmaengine ASoC driver");
  53 MODULE_LICENSE("GPL");