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Linux/sound/soc/spear/spear_pcm.c

  1 /*
  2  * ALSA PCM interface for ST SPEAr Processors
  3  *
  4  * sound/soc/spear/spear_pcm.c
  5  *
  6  * Copyright (C) 2012 ST Microelectronics
  7  * Rajeev Kumar<rajeev-dlh.kumar@st.com>
  8  *
  9  * This file is licensed under the terms of the GNU General Public
 10  * License version 2. This program is licensed "as is" without any
 11  * warranty of any kind, whether express or implied.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/dmaengine.h>
 16 #include <linux/platform_device.h>
 17 #include <sound/dmaengine_pcm.h>
 18 #include <sound/pcm.h>
 19 #include <sound/soc.h>
 20 #include <sound/spear_dma.h>
 21 #include "spear_pcm.h"
 22 
 23 static const struct snd_pcm_hardware spear_pcm_hardware = {
 24         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
 25                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 26                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
 27         .buffer_bytes_max = 16 * 1024, /* max buffer size */
 28         .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
 29         .period_bytes_max = 2 * 1024, /* maximum period size */
 30         .periods_min = 1, /* min # periods */
 31         .periods_max = 8, /* max # of periods */
 32         .fifo_size = 0, /* fifo size in bytes */
 33 };
 34 
 35 static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
 36         .pcm_hardware = &spear_pcm_hardware,
 37         .prealloc_buffer_size = 16 * 1024,
 38 };
 39 
 40 int devm_spear_pcm_platform_register(struct device *dev,
 41                         struct snd_dmaengine_pcm_config *config,
 42                         bool (*filter)(struct dma_chan *chan, void *slave))
 43 {
 44         *config = spear_dmaengine_pcm_config;
 45         config->compat_filter_fn = filter;
 46 
 47         return snd_dmaengine_pcm_register(dev, config,
 48                 SND_DMAENGINE_PCM_FLAG_NO_DT |
 49                 SND_DMAENGINE_PCM_FLAG_COMPAT);
 50 }
 51 EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
 52 
 53 MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
 54 MODULE_DESCRIPTION("SPEAr PCM DMA module");
 55 MODULE_LICENSE("GPL");
 56 

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