120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
|
|
* 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 <linux/module.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/pxa2xx-lib.h>
|
|
#include <sound/dmaengine_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_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct snd_dmaengine_dai_dma_data *dma;
|
|
|
|
dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
|
|
|
|
/* return if this is a bufferless transfer e.g.
|
|
* codec <--> BT codec or GSM modem -- lg FIXME */
|
|
if (!dma)
|
|
return 0;
|
|
|
|
return __pxa2xx_pcm_hw_params(substream, params);
|
|
}
|
|
|
|
static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
__pxa2xx_pcm_hw_free(substream);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
|
{
|
|
struct snd_card *card = rtd->card->snd_card;
|
|
struct snd_pcm *pcm = rtd->pcm;
|
|
int ret;
|
|
|
|
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
|
|
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
|
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct snd_soc_platform_driver pxa2xx_soc_platform = {
|
|
.ops = &pxa2xx_pcm_ops,
|
|
.pcm_new = pxa2xx_soc_pcm_new,
|
|
.pcm_free = pxa2xx_pcm_free_dma_buffers,
|
|
};
|
|
|
|
static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
|
|
{
|
|
return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id snd_soc_pxa_audio_match[] = {
|
|
{ .compatible = "mrvl,pxa-pcm-audio" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match);
|
|
#endif
|
|
|
|
static struct platform_driver pxa_pcm_driver = {
|
|
.driver = {
|
|
.name = "pxa-pcm-audio",
|
|
.of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
|
|
},
|
|
|
|
.probe = pxa2xx_soc_platform_probe,
|
|
};
|
|
|
|
module_platform_driver(pxa_pcm_driver);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
|
|
MODULE_LICENSE("GPL");
|