LXR linux/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
  25static 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
  41static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  42{
  43        __pxa2xx_pcm_hw_free(substream);
  44
  45        return 0;
  46}
  47
  48static 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
  60static 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
  87static 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
  93static 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
  99static const struct of_device_id snd_soc_pxa_audio_match[] = {
 100        { .compatible   = "mrvl,pxa-pcm-audio" },
 101        { }
 102};
 103MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match);
 104#endif
 105
 106static 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
 115module_platform_driver(pxa_pcm_driver);
 116
 117MODULE_AUTHOR("Nicolas Pitre");
 118MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 119MODULE_LICENSE("GPL");
 120MODULE_ALIAS("platform:pxa-pcm-audio");
 121