110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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* Copyright (C) 2006 Applied Data Systems
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*
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* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
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* Copyright (c) 2008 Ryan Mallon
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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/init.h>
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include <linux/platform_data/dma-ep93xx.h>
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static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
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.info = (SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER),
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.rates = SNDRV_PCM_RATE_8000_192000,
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.rate_min = SNDRV_PCM_RATE_8000,
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.rate_max = SNDRV_PCM_RATE_192000,
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.formats = (SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE),
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.buffer_bytes_max = 131072,
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.period_bytes_min = 32,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 32,
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.fifo_size = 32,
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};
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static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
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{
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struct ep93xx_dma_data *data = filter_param;
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if (data->direction == ep93xx_dma_chan_direction(chan)) {
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chan->private = data;
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return true;
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}
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return false;
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}
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static struct dma_chan *ep93xx_compat_request_channel(
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struct snd_soc_pcm_runtime *rtd,
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struct snd_pcm_substream *substream)
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{
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struct snd_dmaengine_dai_dma_data *dma_data;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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return snd_dmaengine_pcm_request_channel(ep93xx_pcm_dma_filter,
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dma_data);
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}
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static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
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.pcm_hardware = &ep93xx_pcm_hardware,
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.compat_filter_fn = ep93xx_pcm_dma_filter,
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.compat_request_channel = ep93xx_compat_request_channel,
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.prealloc_buffer_size = 131072,
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};
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static int ep93xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_dmaengine_pcm_register(&pdev->dev,
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&ep93xx_dmaengine_pcm_config,
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SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
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SND_DMAENGINE_PCM_FLAG_NO_DT |
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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static int ep93xx_soc_platform_remove(struct platform_device *pdev)
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{
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snd_dmaengine_pcm_unregister(&pdev->dev);
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return 0;
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}
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static struct platform_driver ep93xx_pcm_driver = {
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.driver = {
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.name = "ep93xx-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_soc_platform_probe,
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.remove = ep93xx_soc_platform_remove,
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};
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module_platform_driver(ep93xx_pcm_driver);
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MODULE_AUTHOR("Ryan Mallon");
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MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ep93xx-pcm-audio");
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