ASoC: samsung: dmaengine: Allow to specify custom DMA device
[platform/kernel/linux-exynos.git] / 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                                        struct device *dma_dev)
30 {
31         unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT;
32         struct snd_dmaengine_pcm_config *pcm_conf;
33
34         pcm_conf = devm_kzalloc(dev, sizeof(*pcm_conf), GFP_KERNEL);
35         if (!pcm_conf)
36                 return -ENOMEM;
37
38         pcm_conf->prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
39         pcm_conf->compat_filter_fn = filter;
40         pcm_conf->dma_dev = dma_dev;
41
42         if (dev->of_node) {
43                 pcm_conf->chan_names[SNDRV_PCM_STREAM_PLAYBACK] = tx;
44                 pcm_conf->chan_names[SNDRV_PCM_STREAM_CAPTURE] = rx;
45         } else {
46                 flags |= SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME;
47         }
48
49         return devm_snd_dmaengine_pcm_register(dev, pcm_conf, flags);
50 }
51 EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
52
53 MODULE_AUTHOR("Mark Brown <broonie@linaro.org>");
54 MODULE_DESCRIPTION("Samsung dmaengine ASoC driver");
55 MODULE_LICENSE("GPL");