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<rajeevkumar.linux@gmail.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 devm_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 <rajeevkumar.linux@gmail.com>");
  54 MODULE_DESCRIPTION("SPEAr PCM DMA module");
  55 MODULE_LICENSE("GPL");