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71 lines
1.9 KiB
71 lines
1.9 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("sDMA PCM ASoC platform driver"); |
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MODULE_LICENSE("GPL v2");
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