pxa2xx-pcm.c

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/*
 * 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");