root/sound/soc/pxa/pxa2xx-pcm.c

DEFINITIONS

1. pxa2xx_pcm_hw_params
2. pxa2xx_pcm_hw_free
3. pxa2xx_soc_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 <linux/dma-mapping.h>

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

#include "pxa2xx-pcm.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 = rtd->dai->cpu_dai->dma_data;
        int ret;

        /* 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) {
                pxa_free_dma(prtd->dma_ch);
                prtd->dma_ch = 0;
        }

        return 0;
}

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_32BIT_MASK;

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_32BIT_MASK;

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

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

struct snd_soc_platform pxa2xx_soc_platform = {
        .name           = "pxa2xx-audio",
        .pcm_ops        = &pxa2xx_pcm_ops,
        .pcm_new        = pxa2xx_soc_pcm_new,
        .pcm_free       = pxa2xx_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);

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