103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
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//
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// This file is provided under a dual BSD/GPLv2 license. When using or
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// redistributing this file, you may do so under either license.
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//
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// Copyright(c) 2019 Intel Corporation. All rights reserved.
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//
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// Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
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/* Generic SOF IPC code */
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <sound/pcm.h>
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#include <sound/sof/stream.h>
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#include "ops.h"
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#include "sof-priv.h"
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struct sof_stream {
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size_t posn_offset;
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};
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/* Mailbox-based Generic IPC implementation */
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int sof_ipc_msg_data(struct snd_sof_dev *sdev,
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struct snd_pcm_substream *substream,
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void *p, size_t sz)
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{
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if (!substream || !sdev->stream_box.size) {
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snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
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} else {
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struct sof_stream *stream = substream->runtime->private_data;
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/* The stream might already be closed */
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if (!stream)
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return -ESTRPIPE;
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snd_sof_dsp_mailbox_read(sdev, stream->posn_offset, p, sz);
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}
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return 0;
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}
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EXPORT_SYMBOL(sof_ipc_msg_data);
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int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
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struct snd_pcm_substream *substream,
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size_t posn_offset)
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{
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struct sof_stream *stream = substream->runtime->private_data;
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/* check if offset is overflow or it is not aligned */
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if (posn_offset > sdev->stream_box.size ||
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posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
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return -EINVAL;
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stream->posn_offset = sdev->stream_box.offset + posn_offset;
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dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
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substream->stream, stream->posn_offset);
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return 0;
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}
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EXPORT_SYMBOL(sof_set_stream_data_offset);
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int sof_stream_pcm_open(struct snd_sof_dev *sdev,
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struct snd_pcm_substream *substream)
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{
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struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
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if (!stream)
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return -ENOMEM;
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/* binding pcm substream to hda stream */
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substream->runtime->private_data = stream;
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/* align to DMA minimum transfer size */
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snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
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/* avoid circular buffer wrap in middle of period */
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snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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return 0;
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}
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EXPORT_SYMBOL(sof_stream_pcm_open);
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int sof_stream_pcm_close(struct snd_sof_dev *sdev,
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struct snd_pcm_substream *substream)
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{
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struct sof_stream *stream = substream->runtime->private_data;
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substream->runtime->private_data = NULL;
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kfree(stream);
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return 0;
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}
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EXPORT_SYMBOL(sof_stream_pcm_close);
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MODULE_LICENSE("Dual BSD/GPL");
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