// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2019 Intel Corporation
//
// Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

/* Generic SOF IPC code */

#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/types.h>

#include <sound/pcm.h>
#include <sound/sof/stream.h>

#include "ops.h"
#include "sof-priv.h"
#include "sof-audio.h"

struct sof_stream {
        size_t posn_offset;
};

/* Mailbox-based Generic IPC implementation */
int sof_ipc_msg_data(struct snd_sof_dev *sdev,
                     struct snd_sof_pcm_stream *sps,
                     void *p, size_t sz)
{
        if (!sps || !sdev->stream_box.size) {
                snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
        } else {
                size_t posn_offset;

                if (sps->substream) {
                        struct sof_stream *stream = sps->substream->runtime->private_data;

                        /* The stream might already be closed */
                        if (!stream)
                                return -ESTRPIPE;

                        posn_offset = stream->posn_offset;
                } else if (sps->cstream) {

                        struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;

                        if (!sstream)
                                return -ESTRPIPE;

                        posn_offset = sstream->posn_offset;

                } else {
                        dev_err(sdev->dev, "%s: No stream opened\n", __func__);
                        return -EINVAL;
                }

                snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz);
        }

        return 0;
}
EXPORT_SYMBOL(sof_ipc_msg_data);

int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
                               struct snd_sof_pcm_stream *sps,
                               size_t posn_offset)
{
        /* check if offset is overflow or it is not aligned */
        if (posn_offset > sdev->stream_box.size ||
            posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
                return -EINVAL;

        posn_offset += sdev->stream_box.offset;

        if (sps->substream) {
                struct sof_stream *stream = sps->substream->runtime->private_data;

                stream->posn_offset = posn_offset;
                dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
                        sps->substream->stream, posn_offset);
        } else if (sps->cstream) {
                struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;

                sstream->posn_offset = posn_offset;
                dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu",
                        sps->cstream->direction, posn_offset);
        } else {
                dev_err(sdev->dev, "No stream opened");
                return -EINVAL;
        }

        return 0;
}
EXPORT_SYMBOL(sof_set_stream_data_offset);

int sof_stream_pcm_open(struct snd_sof_dev *sdev,
                        struct snd_pcm_substream *substream)
{
        struct sof_stream *stream = kmalloc_obj(*stream);

        if (!stream)
                return -ENOMEM;

        /* binding pcm substream to hda stream */
        substream->runtime->private_data = stream;

        /* align to DMA minimum transfer size */
        snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);

        /* avoid circular buffer wrap in middle of period */
        snd_pcm_hw_constraint_integer(substream->runtime,
                                      SNDRV_PCM_HW_PARAM_PERIODS);

        return 0;
}
EXPORT_SYMBOL(sof_stream_pcm_open);

int sof_stream_pcm_close(struct snd_sof_dev *sdev,
                         struct snd_pcm_substream *substream)
{
        struct sof_stream *stream = substream->runtime->private_data;

        substream->runtime->private_data = NULL;
        kfree(stream);

        return 0;
}
EXPORT_SYMBOL(sof_stream_pcm_close);