LXR linux/sound/soc/spear/spear

   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
  23static 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
  35static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
  36        .pcm_hardware = &spear_pcm_hardware,
  37        .prealloc_buffer_size = 16 * 1024,
  38};
  39
  40int 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}
  51EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
  52
  53MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
  54MODULE_DESCRIPTION("SPEAr PCM DMA module");
  55MODULE_LICENSE("GPL");
  56