/*
   * 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 <linux/module.h>

  #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");