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