kernel/sound/soc/pxa/pxa2xx-pcm.c

   1 /*
   2  * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
   3  *
   4  * Author:      Nicolas Pitre
   5  * Created:     Nov 30, 2004
   6  * Copyright:   (C) 2004 MontaVista Software, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/dma-mapping.h>
  14 #include <linux/module.h>
  15 #include <linux/dmaengine.h>
  16 #include <linux/of.h>
  17
  18 #include <sound/core.h>
  19 #include <sound/soc.h>
  20 #include <sound/pxa2xx-lib.h>
  21 #include <sound/dmaengine_pcm.h>
  22
  23 #include "../../arm/pxa2xx-pcm.h"
  24
  25 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  26         struct snd_pcm_hw_params *params)
  27 {
  28         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  29         struct snd_dmaengine_dai_dma_data *dma;
  30
  31         dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  32
  33         /* return if this is a bufferless transfer e.g.
  34          * codec <--> BT codec or GSM modem -- lg FIXME */
  35         if (!dma)
  36                 return 0;
  37
  38         return __pxa2xx_pcm_hw_params(substream, params);
  39 }
  40
  41 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  42 {
  43         __pxa2xx_pcm_hw_free(substream);
  44
  45         return 0;
  46 }
  47
  48 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  49         .open           = __pxa2xx_pcm_open,
  50         .close          = __pxa2xx_pcm_close,
  51         .ioctl          = snd_pcm_lib_ioctl,
  52         .hw_params      = pxa2xx_pcm_hw_params,
  53         .hw_free        = pxa2xx_pcm_hw_free,
  54         .prepare        = __pxa2xx_pcm_prepare,
  55         .trigger        = pxa2xx_pcm_trigger,
  56         .pointer        = pxa2xx_pcm_pointer,
  57         .mmap           = pxa2xx_pcm_mmap,
  58 };
  59
  60 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  61 {
  62         struct snd_card *card = rtd->card->snd_card;
  63         struct snd_pcm *pcm = rtd->pcm;
  64         int ret;
  65
  66         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
  67         if (ret)
  68                 return ret;
  69
  70         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
  71                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
  72                         SNDRV_PCM_STREAM_PLAYBACK);
  73                 if (ret)
  74                         goto out;
  75         }
  76
  77         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
  78                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
  79                         SNDRV_PCM_STREAM_CAPTURE);
  80                 if (ret)
  81                         goto out;
  82         }
  83  out:
  84         return ret;
  85 }
  86
  87 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
  88         .ops    = &pxa2xx_pcm_ops,
  89         .pcm_new        = pxa2xx_soc_pcm_new,
  90         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
  91 };
  92
  93 static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
  94 {
  95         return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
  96 }
  97
  98 #ifdef CONFIG_OF
  99 static const struct of_device_id snd_soc_pxa_audio_match[] = {
 100         { .compatible   = "mrvl,pxa-pcm-audio" },
 101         { }
 102 };
 103 MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match);
 104 #endif
 105
 106 static struct platform_driver pxa_pcm_driver = {
 107         .driver = {
 108                 .name = "pxa-pcm-audio",
 109                 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
 110         },
 111
 112         .probe = pxa2xx_soc_platform_probe,
 113 };
 114
 115 module_platform_driver(pxa_pcm_driver);
 116
 117 MODULE_AUTHOR("Nicolas Pitre");
 118 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 119 MODULE_LICENSE("GPL");