LXR linux/sound/soc/cirrus/ep93xx-pcm.c

   1/*
   2 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
   3 *
   4 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   5 * Copyright (C) 2006 Applied Data Systems
   6 *
   7 * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
   8 *   Copyright (c) 2008 Ryan Mallon
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/init.h>
  17#include <linux/platform_device.h>
  18#include <linux/dmaengine.h>
  19
  20#include <sound/pcm.h>
  21#include <sound/soc.h>
  22#include <sound/dmaengine_pcm.h>
  23
  24#include <linux/platform_data/dma-ep93xx.h>
  25
  26#include "ep93xx-pcm.h"
  27
  28static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  29        .info                   = (SNDRV_PCM_INFO_MMAP          |
  30                                   SNDRV_PCM_INFO_MMAP_VALID    |
  31                                   SNDRV_PCM_INFO_INTERLEAVED   |
  32                                   SNDRV_PCM_INFO_BLOCK_TRANSFER),
  33        .buffer_bytes_max       = 131072,
  34        .period_bytes_min       = 32,
  35        .period_bytes_max       = 32768,
  36        .periods_min            = 1,
  37        .periods_max            = 32,
  38        .fifo_size              = 32,
  39};
  40
  41static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  42{
  43        struct ep93xx_dma_data *data = filter_param;
  44
  45        if (data->direction == ep93xx_dma_chan_direction(chan)) {
  46                chan->private = data;
  47                return true;
  48        }
  49
  50        return false;
  51}
  52
  53static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
  54        .pcm_hardware = &ep93xx_pcm_hardware,
  55        .compat_filter_fn = ep93xx_pcm_dma_filter,
  56        .prealloc_buffer_size = 131072,
  57};
  58
  59int devm_ep93xx_pcm_platform_register(struct device *dev)
  60{
  61        return devm_snd_dmaengine_pcm_register(dev,
  62                &ep93xx_dmaengine_pcm_config,
  63                SND_DMAENGINE_PCM_FLAG_NO_DT |
  64                SND_DMAENGINE_PCM_FLAG_COMPAT);
  65}
  66EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
  67
  68MODULE_AUTHOR("Ryan Mallon");
  69MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
  70MODULE_LICENSE("GPL");
  71