134 lines
3.1 KiB
C
134 lines
3.1 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/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <sound/core.h>
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#include <sound/pxa2xx-lib.h>
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#include <sound/dmaengine_pcm.h>
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#include "pxa2xx-pcm.h"
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static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_pcm_client *client = substream->private_data;
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__pxa2xx_pcm_prepare(substream);
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return client->prepare(substream);
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}
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static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_pcm_client *client = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd;
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int ret;
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ret = __pxa2xx_pcm_open(substream);
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if (ret)
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goto out;
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rtd = runtime->private_data;
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rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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client->playback_params : client->capture_params;
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ret = pxa_request_dma("dma", DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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goto err2;
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rtd->dma_ch = ret;
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ret = client->startup(substream);
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if (!ret)
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goto out;
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pxa_free_dma(rtd->dma_ch);
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err2:
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__pxa2xx_pcm_close(substream);
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out:
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return ret;
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}
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static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_pcm_client *client = substream->private_data;
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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pxa_free_dma(rtd->dma_ch);
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client->shutdown(substream);
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return __pxa2xx_pcm_close(substream);
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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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int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
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struct snd_pcm **rpcm)
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{
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struct snd_pcm *pcm;
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int play = client->playback_params ? 1 : 0;
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int capt = client->capture_params ? 1 : 0;
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int ret;
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ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
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if (ret)
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goto out;
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pcm->private_data = client;
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pcm->private_free = pxa2xx_pcm_free_dma_buffers;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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goto out;
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if (play) {
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int stream = SNDRV_PCM_STREAM_PLAYBACK;
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snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
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if (ret)
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goto out;
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}
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if (capt) {
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int stream = SNDRV_PCM_STREAM_CAPTURE;
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snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
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if (ret)
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goto out;
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}
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if (rpcm)
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*rpcm = pcm;
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ret = 0;
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out:
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return ret;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_new);
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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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