root/sound/soc/cirrus/ep93xx-pcm.c

DEFINITIONS

1. ep93xx_pcm_dma_filter
2. devm_ep93xx_pcm_platform_register

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
   4  *
   5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6  * Copyright (C) 2006 Applied Data Systems
   7  *
   8  * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
   9  *   Copyright (c) 2008 Ryan Mallon
  10  */
  11 
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/dmaengine.h>
  16 
  17 #include <sound/pcm.h>
  18 #include <sound/soc.h>
  19 #include <sound/dmaengine_pcm.h>
  20 
  21 #include <linux/platform_data/dma-ep93xx.h>
  22 
  23 #include "ep93xx-pcm.h"
  24 
  25 static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  26         .info                   = (SNDRV_PCM_INFO_MMAP          |
  27                                    SNDRV_PCM_INFO_MMAP_VALID    |
  28                                    SNDRV_PCM_INFO_INTERLEAVED   |
  29                                    SNDRV_PCM_INFO_BLOCK_TRANSFER),
  30         .buffer_bytes_max       = 131072,
  31         .period_bytes_min       = 32,
  32         .period_bytes_max       = 32768,
  33         .periods_min            = 1,
  34         .periods_max            = 32,
  35         .fifo_size              = 32,
  36 };
  37 
  38 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  39 {
  40         struct ep93xx_dma_data *data = filter_param;
  41 
  42         if (data->direction == ep93xx_dma_chan_direction(chan)) {
  43                 chan->private = data;
  44                 return true;
  45         }
  46 
  47         return false;
  48 }
  49 
  50 static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
  51         .pcm_hardware = &ep93xx_pcm_hardware,
  52         .compat_filter_fn = ep93xx_pcm_dma_filter,
  53         .prealloc_buffer_size = 131072,
  54 };
  55 
  56 int devm_ep93xx_pcm_platform_register(struct device *dev)
  57 {
  58         return devm_snd_dmaengine_pcm_register(dev,
  59                 &ep93xx_dmaengine_pcm_config,
  60                 SND_DMAENGINE_PCM_FLAG_NO_DT |
  61                 SND_DMAENGINE_PCM_FLAG_COMPAT);
  62 }
  63 EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
  64 
  65 MODULE_AUTHOR("Ryan Mallon");
  66 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
  67 MODULE_LICENSE("GPL");