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 static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  27         .info                   = (SNDRV_PCM_INFO_MMAP          |
  28                                    SNDRV_PCM_INFO_MMAP_VALID    |
  29                                    SNDRV_PCM_INFO_INTERLEAVED   |
  30                                    SNDRV_PCM_INFO_BLOCK_TRANSFER),
  31
  32         .rates                  = SNDRV_PCM_RATE_8000_192000,
  33         .rate_min               = SNDRV_PCM_RATE_8000,
  34         .rate_max               = SNDRV_PCM_RATE_192000,
  35
  36         .formats                = (SNDRV_PCM_FMTBIT_S16_LE |
  37                                    SNDRV_PCM_FMTBIT_S24_LE |
  38                                    SNDRV_PCM_FMTBIT_S32_LE),
  39
  40         .buffer_bytes_max       = 131072,
  41         .period_bytes_min       = 32,
  42         .period_bytes_max       = 32768,
  43         .periods_min            = 1,
  44         .periods_max            = 32,
  45         .fifo_size              = 32,
  46 };
  47
  48 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  49 {
  50         struct ep93xx_dma_data *data = filter_param;
  51
  52         if (data->direction == ep93xx_dma_chan_direction(chan)) {
  53                 chan->private = data;
  54                 return true;
  55         }
  56
  57         return false;
  58 }
  59
  60 static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
  61         .pcm_hardware = &ep93xx_pcm_hardware,
  62         .compat_filter_fn = ep93xx_pcm_dma_filter,
  63         .prealloc_buffer_size = 131072,
  64 };
  65
  66 static int ep93xx_soc_platform_probe(struct platform_device *pdev)
  67 {
  68         return snd_dmaengine_pcm_register(&pdev->dev,
  69                 &ep93xx_dmaengine_pcm_config,
  70                 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
  71                 SND_DMAENGINE_PCM_FLAG_NO_DT |
  72                 SND_DMAENGINE_PCM_FLAG_COMPAT);
  73 }
  74
  75 static int ep93xx_soc_platform_remove(struct platform_device *pdev)
  76 {
  77         snd_dmaengine_pcm_unregister(&pdev->dev);
  78         return 0;
  79 }
  80
  81 static struct platform_driver ep93xx_pcm_driver = {
  82         .driver = {
  83                         .name = "ep93xx-pcm-audio",
  84                         .owner = THIS_MODULE,
  85         },
  86
  87         .probe = ep93xx_soc_platform_probe,
  88         .remove = ep93xx_soc_platform_remove,
  89 };
  90
  91 module_platform_driver(ep93xx_pcm_driver);
  92
  93 MODULE_AUTHOR("Ryan Mallon");
  94 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
  95 MODULE_LICENSE("GPL");
  96 MODULE_ALIAS("platform:ep93xx-pcm-audio");