root/sound/arm/pxa2xx-pcm.c

DEFINITIONS

1. pxa2xx_pcm_prepare
2. pxa2xx_pcm_open
3. pxa2xx_pcm_close
4. pxa2xx_pcm_new

/*
 * 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");