151 строка
3.7 KiB
C
151 строка
3.7 KiB
C
/*
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* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/dmaengine.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/pxa2xx-lib.h>
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#include <sound/dmaengine_pcm.h>
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#include "../../arm/pxa2xx-pcm.h"
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static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_dmaengine_dai_dma_data *dma;
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int ret;
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dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma)
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return 0;
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/* this may get called several times by oss emulation
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* with different params */
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if (prtd->params == NULL) {
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prtd->params = dma;
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ret = pxa_request_dma("name", DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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} else if (prtd->params != dma) {
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pxa_free_dma(prtd->dma_ch);
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prtd->params = dma;
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ret = pxa_request_dma("name", DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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}
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return __pxa2xx_pcm_hw_params(substream, params);
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}
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static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
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__pxa2xx_pcm_hw_free(substream);
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if (prtd->dma_ch >= 0) {
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pxa_free_dma(prtd->dma_ch);
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prtd->dma_ch = -1;
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prtd->params = NULL;
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}
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return 0;
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}
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static struct snd_pcm_ops pxa2xx_pcm_ops = {
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.open = __pxa2xx_pcm_open,
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.close = __pxa2xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pxa2xx_pcm_hw_params,
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.hw_free = pxa2xx_pcm_hw_free,
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.prepare = __pxa2xx_pcm_prepare,
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.trigger = pxa2xx_pcm_trigger,
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.pointer = pxa2xx_pcm_pointer,
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.mmap = pxa2xx_pcm_mmap,
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};
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static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
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static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &pxa2xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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static struct snd_soc_platform_driver pxa2xx_soc_platform = {
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.ops = &pxa2xx_pcm_ops,
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.pcm_new = pxa2xx_soc_pcm_new,
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.pcm_free = pxa2xx_pcm_free_dma_buffers,
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};
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static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
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}
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static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver pxa_pcm_driver = {
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.driver = {
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.name = "pxa-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = pxa2xx_soc_platform_probe,
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.remove = pxa2xx_soc_platform_remove,
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};
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module_platform_driver(pxa_pcm_driver);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
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MODULE_LICENSE("GPL");
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