72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
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*/
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#include <linux/device.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/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "sdma-pcm.h"
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static const struct snd_pcm_hardware sdma_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_PAUSE | SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
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SNDRV_PCM_INFO_INTERLEAVED,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * 1024,
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.buffer_bytes_max = 128 * 1024,
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.periods_min = 2,
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.periods_max = 255,
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};
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static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
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.pcm_hardware = &sdma_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.prealloc_buffer_size = 128 * 1024,
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};
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int sdma_pcm_platform_register(struct device *dev,
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char *txdmachan, char *rxdmachan)
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{
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struct snd_dmaengine_pcm_config *config;
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unsigned int flags = 0;
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/* Standard names for the directions: 'tx' and 'rx' */
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if (!txdmachan && !rxdmachan)
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return devm_snd_dmaengine_pcm_register(dev,
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&sdma_dmaengine_pcm_config, 0);
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config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
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if (!config)
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return -ENOMEM;
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*config = sdma_dmaengine_pcm_config;
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if (!txdmachan || !rxdmachan) {
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/* One direction only PCM */
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flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
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if (!txdmachan) {
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txdmachan = rxdmachan;
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rxdmachan = NULL;
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}
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}
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config->chan_names[0] = txdmachan;
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config->chan_names[1] = rxdmachan;
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return devm_snd_dmaengine_pcm_register(dev, config, flags);
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}
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EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
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MODULE_LICENSE("GPL v2");
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