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pxa2xx-pcm.c

/*
 * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
 *
 * Author:  Nicolas Pitre
 * Created: Nov 30, 2004
 * Copyright:     (C) 2004 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <sound/core.h>
#include <sound/pxa2xx-lib.h>

#include "pxa2xx-pcm.h"

static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct pxa2xx_pcm_client *client = substream->private_data;

      __pxa2xx_pcm_prepare(substream);

      return client->prepare(substream);
}

static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
{
      struct pxa2xx_pcm_client *client = substream->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct pxa2xx_runtime_data *rtd;
      int ret;

      ret = __pxa2xx_pcm_open(substream);
      if (ret)
            goto out;

      rtd = runtime->private_data;

      rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
                  client->playback_params : client->capture_params;
      ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
                        pxa2xx_pcm_dma_irq, substream);
      if (ret < 0)
            goto err2;
      rtd->dma_ch = ret;

      ret = client->startup(substream);
      if (!ret)
            goto out;

      pxa_free_dma(rtd->dma_ch);
 err2:
      __pxa2xx_pcm_close(substream);
 out:
      return ret;
}

static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
{
      struct pxa2xx_pcm_client *client = substream->private_data;
      struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

      pxa_free_dma(rtd->dma_ch);
      client->shutdown(substream);

      return __pxa2xx_pcm_close(substream);
}

static struct snd_pcm_ops pxa2xx_pcm_ops = {
      .open       = pxa2xx_pcm_open,
      .close            = pxa2xx_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = __pxa2xx_pcm_hw_params,
      .hw_free    = __pxa2xx_pcm_hw_free,
      .prepare    = pxa2xx_pcm_prepare,
      .trigger    = pxa2xx_pcm_trigger,
      .pointer    = pxa2xx_pcm_pointer,
      .mmap       = pxa2xx_pcm_mmap,
};

static u64 pxa2xx_pcm_dmamask = 0xffffffff;

int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
               struct snd_pcm **rpcm)
{
      struct snd_pcm *pcm;
      int play = client->playback_params ? 1 : 0;
      int capt = client->capture_params ? 1 : 0;
      int ret;

      ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
      if (ret)
            goto out;

      pcm->private_data = client;
      pcm->private_free = pxa2xx_pcm_free_dma_buffers;

      if (!card->dev->dma_mask)
            card->dev->dma_mask = &pxa2xx_pcm_dmamask;
      if (!card->dev->coherent_dma_mask)
            card->dev->coherent_dma_mask = 0xffffffff;

      if (play) {
            int stream = SNDRV_PCM_STREAM_PLAYBACK;
            snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
            ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
            if (ret)
                  goto out;
      }
      if (capt) {
            int stream = SNDRV_PCM_STREAM_CAPTURE;
            snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
            ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
            if (ret)
                  goto out;
      }

      if (rpcm)
            *rpcm = pcm;
      ret = 0;

 out:
      return ret;
}

EXPORT_SYMBOL(pxa2xx_pcm_new);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
MODULE_LICENSE("GPL");

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