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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 <linux/dma-mapping.h>

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

#include "../../arm/pxa2xx-pcm.h"

static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct pxa2xx_runtime_data *prtd = runtime->private_data;
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct pxa2xx_pcm_dma_params *dma;
      int ret;

      dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

      /* return if this is a bufferless transfer e.g.
       * codec <--> BT codec or GSM modem -- lg FIXME */
      if (!dma)
            return 0;

      /* this may get called several times by oss emulation
       * with different params */
      if (prtd->params == NULL) {
            prtd->params = dma;
            ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
                        pxa2xx_pcm_dma_irq, substream);
            if (ret < 0)
                  return ret;
            prtd->dma_ch = ret;
      } else if (prtd->params != dma) {
            pxa_free_dma(prtd->dma_ch);
            prtd->params = dma;
            ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
                        pxa2xx_pcm_dma_irq, substream);
            if (ret < 0)
                  return ret;
            prtd->dma_ch = ret;
      }

      return __pxa2xx_pcm_hw_params(substream, params);
}

static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
      struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;

      __pxa2xx_pcm_hw_free(substream);

      if (prtd->dma_ch >= 0) {
            pxa_free_dma(prtd->dma_ch);
            prtd->dma_ch = -1;
      }

      return 0;
}

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 = DMA_BIT_MASK(32);

static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
      struct snd_pcm *pcm)
{
      int ret = 0;

      if (!card->dev->dma_mask)
            card->dev->dma_mask = &pxa2xx_pcm_dmamask;
      if (!card->dev->coherent_dma_mask)
            card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

      if (dai->driver->playback.channels_min) {
            ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
                  SNDRV_PCM_STREAM_PLAYBACK);
            if (ret)
                  goto out;
      }

      if (dai->driver->capture.channels_min) {
            ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
                  SNDRV_PCM_STREAM_CAPTURE);
            if (ret)
                  goto out;
      }
 out:
      return ret;
}

static struct snd_soc_platform_driver pxa2xx_soc_platform = {
      .ops  = &pxa2xx_pcm_ops,
      .pcm_new    = pxa2xx_soc_pcm_new,
      .pcm_free   = pxa2xx_pcm_free_dma_buffers,
};

static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev)
{
      return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
}

static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev)
{
      snd_soc_unregister_platform(&pdev->dev);
      return 0;
}

static struct platform_driver pxa_pcm_driver = {
      .driver = {
                  .name = "pxa-pcm-audio",
                  .owner = THIS_MODULE,
      },

      .probe = pxa2xx_soc_platform_probe,
      .remove = __devexit_p(pxa2xx_soc_platform_remove),
};

static int __init snd_pxa_pcm_init(void)
{
      return platform_driver_register(&pxa_pcm_driver);
}
module_init(snd_pxa_pcm_init);

static void __exit snd_pxa_pcm_exit(void)
{
      platform_driver_unregister(&pxa_pcm_driver);
}
module_exit(snd_pxa_pcm_exit);

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

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