// 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");