90130d2e8f
When using the legacy filter function channel requests we currently pass the audio specific struct snd_dmaengine_dai_dma_data which isn't likely to be helpful for actual filtering. Since there's already a field in the structure called filter_data clearly intended for use here convert the driver to use that. All existing users of plain filter functions have been converted to use an explicit compat function to override this behaviour except i.MX which is working around this issue in its filter function and is updated to just use filter_data directly here. Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Lars-Peter Clausen <lars@metafoo.de>
77 lines
2 KiB
C
77 lines
2 KiB
C
/*
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* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
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*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <sound/core.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 "imx-pcm.h"
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static bool filter(struct dma_chan *chan, void *param)
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{
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if (!imx_dma_is_general_purpose(chan))
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return false;
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chan->private = param;
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return true;
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}
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static const struct snd_pcm_hardware imx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rate_min = 8000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 65535, /* Limited by SDMA engine */
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
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.pcm_hardware = &imx_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.compat_filter_fn = filter,
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.prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
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};
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int imx_pcm_dma_init(struct platform_device *pdev)
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{
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return snd_dmaengine_pcm_register(&pdev->dev, &imx_dmaengine_pcm_config,
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SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
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void imx_pcm_dma_exit(struct platform_device *pdev)
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{
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snd_dmaengine_pcm_unregister(&pdev->dev);
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}
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EXPORT_SYMBOL_GPL(imx_pcm_dma_exit);
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MODULE_LICENSE("GPL");
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