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-rw-r--r--include/sound/compress_driver.h231
1 files changed, 231 insertions, 0 deletions
diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
new file mode 100644
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--- /dev/null
+++ b/include/sound/compress_driver.h
@@ -0,0 +1,231 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * compress_driver.h - compress offload driver definations
+ *
+ * Copyright (C) 2011 Intel Corporation
+ * Authors: Vinod Koul <vinod.koul@linux.intel.com>
+ * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
+ */
+
+#ifndef __COMPRESS_DRIVER_H
+#define __COMPRESS_DRIVER_H
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <sound/core.h>
+#include <sound/compress_offload.h>
+#include <sound/asound.h>
+#include <sound/pcm.h>
+
+struct snd_compr_ops;
+
+/**
+ * struct snd_compr_runtime: runtime stream description
+ * @state: stream state
+ * @ops: pointer to DSP callbacks
+ * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
+ * DSP doesn't implement copy
+ * @buffer_size: size of the above buffer
+ * @fragment_size: size of buffer fragment in bytes
+ * @fragments: number of such fragments
+ * @total_bytes_available: cumulative number of bytes made available in
+ * the ring buffer
+ * @total_bytes_transferred: cumulative bytes transferred by offload DSP
+ * @sleep: poll sleep
+ * @private_data: driver private data pointer
+ * @dma_area: virtual buffer address
+ * @dma_addr: physical buffer address (not accessible from main CPU)
+ * @dma_bytes: size of DMA area
+ * @dma_buffer_p: runtime dma buffer pointer
+ */
+struct snd_compr_runtime {
+ snd_pcm_state_t state;
+ struct snd_compr_ops *ops;
+ void *buffer;
+ u64 buffer_size;
+ u32 fragment_size;
+ u32 fragments;
+ u64 total_bytes_available;
+ u64 total_bytes_transferred;
+ wait_queue_head_t sleep;
+ void *private_data;
+
+ unsigned char *dma_area;
+ dma_addr_t dma_addr;
+ size_t dma_bytes;
+ struct snd_dma_buffer *dma_buffer_p;
+};
+
+/**
+ * struct snd_compr_stream: compressed stream
+ * @name: device name
+ * @ops: pointer to DSP callbacks
+ * @runtime: pointer to runtime structure
+ * @device: device pointer
+ * @error_work: delayed work used when closing the stream due to an error
+ * @direction: stream direction, playback/recording
+ * @metadata_set: metadata set flag, true when set
+ * @next_track: has userspace signal next track transition, true when set
+ * @partial_drain: undergoing partial_drain for stream, true when set
+ * @private_data: pointer to DSP private data
+ * @dma_buffer: allocated buffer if any
+ */
+struct snd_compr_stream {
+ const char *name;
+ struct snd_compr_ops *ops;
+ struct snd_compr_runtime *runtime;
+ struct snd_compr *device;
+ struct delayed_work error_work;
+ enum snd_compr_direction direction;
+ bool metadata_set;
+ bool next_track;
+ bool partial_drain;
+ void *private_data;
+ struct snd_dma_buffer dma_buffer;
+};
+
+/**
+ * struct snd_compr_ops: compressed path DSP operations
+ * @open: Open the compressed stream
+ * This callback is mandatory and shall keep dsp ready to receive the stream
+ * parameter
+ * @free: Close the compressed stream, mandatory
+ * @set_params: Sets the compressed stream parameters, mandatory
+ * This can be called in during stream creation only to set codec params
+ * and the stream properties
+ * @get_params: retrieve the codec parameters, mandatory
+ * @set_metadata: Set the metadata values for a stream
+ * @get_metadata: retrieves the requested metadata values from stream
+ * @trigger: Trigger operations like start, pause, resume, drain, stop.
+ * This callback is mandatory
+ * @pointer: Retrieve current h/w pointer information. Mandatory
+ * @copy: Copy the compressed data to/from userspace, Optional
+ * Can't be implemented if DSP supports mmap
+ * @mmap: DSP mmap method to mmap DSP memory
+ * @ack: Ack for DSP when data is written to audio buffer, Optional
+ * Not valid if copy is implemented
+ * @get_caps: Retrieve DSP capabilities, mandatory
+ * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
+ */
+struct snd_compr_ops {
+ int (*open)(struct snd_compr_stream *stream);
+ int (*free)(struct snd_compr_stream *stream);
+ int (*set_params)(struct snd_compr_stream *stream,
+ struct snd_compr_params *params);
+ int (*get_params)(struct snd_compr_stream *stream,
+ struct snd_codec *params);
+ int (*set_metadata)(struct snd_compr_stream *stream,
+ struct snd_compr_metadata *metadata);
+ int (*get_metadata)(struct snd_compr_stream *stream,
+ struct snd_compr_metadata *metadata);
+ int (*trigger)(struct snd_compr_stream *stream, int cmd);
+ int (*pointer)(struct snd_compr_stream *stream,
+ struct snd_compr_tstamp *tstamp);
+ int (*copy)(struct snd_compr_stream *stream, char __user *buf,
+ size_t count);
+ int (*mmap)(struct snd_compr_stream *stream,
+ struct vm_area_struct *vma);
+ int (*ack)(struct snd_compr_stream *stream, size_t bytes);
+ int (*get_caps) (struct snd_compr_stream *stream,
+ struct snd_compr_caps *caps);
+ int (*get_codec_caps) (struct snd_compr_stream *stream,
+ struct snd_compr_codec_caps *codec);
+};
+
+/**
+ * struct snd_compr: Compressed device
+ * @name: DSP device name
+ * @dev: associated device instance
+ * @ops: pointer to DSP callbacks
+ * @private_data: pointer to DSP pvt data
+ * @card: sound card pointer
+ * @direction: Playback or capture direction
+ * @lock: device lock
+ * @device: device id
+ */
+struct snd_compr {
+ const char *name;
+ struct device dev;
+ struct snd_compr_ops *ops;
+ void *private_data;
+ struct snd_card *card;
+ unsigned int direction;
+ struct mutex lock;
+ int device;
+#ifdef CONFIG_SND_VERBOSE_PROCFS
+ /* private: */
+ char id[64];
+ struct snd_info_entry *proc_root;
+ struct snd_info_entry *proc_info_entry;
+#endif
+};
+
+/* compress device register APIs */
+int snd_compress_register(struct snd_compr *device);
+int snd_compress_deregister(struct snd_compr *device);
+int snd_compress_new(struct snd_card *card, int device,
+ int type, const char *id, struct snd_compr *compr);
+
+/* dsp driver callback apis
+ * For playback: driver should call snd_compress_fragment_elapsed() to let the
+ * framework know that a fragment has been consumed from the ring buffer
+ *
+ * For recording: we want to know when a frame is available or when
+ * at least one frame is available so snd_compress_frame_elapsed()
+ * callback should be called when a encodeded frame is available
+ */
+static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
+{
+ wake_up(&stream->runtime->sleep);
+}
+
+static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
+{
+ if (snd_BUG_ON(!stream))
+ return;
+
+ /* for partial_drain case we are back to running state on success */
+ if (stream->partial_drain) {
+ stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
+ stream->partial_drain = false; /* clear this flag as well */
+ } else {
+ stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+ }
+
+ wake_up(&stream->runtime->sleep);
+}
+
+/**
+ * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
+ * @stream: compress stream to set
+ * @bufp: the buffer information, NULL to clear
+ *
+ * Copy the buffer information to runtime buffer when @bufp is non-NULL.
+ * Otherwise it clears the current buffer information.
+ */
+static inline void
+snd_compr_set_runtime_buffer(struct snd_compr_stream *stream,
+ struct snd_dma_buffer *bufp)
+{
+ struct snd_compr_runtime *runtime = stream->runtime;
+
+ if (bufp) {
+ runtime->dma_buffer_p = bufp;
+ runtime->dma_area = bufp->area;
+ runtime->dma_addr = bufp->addr;
+ runtime->dma_bytes = bufp->bytes;
+ } else {
+ runtime->dma_buffer_p = NULL;
+ runtime->dma_area = NULL;
+ runtime->dma_addr = 0;
+ runtime->dma_bytes = 0;
+ }
+}
+
+int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size);
+int snd_compr_free_pages(struct snd_compr_stream *stream);
+
+int snd_compr_stop_error(struct snd_compr_stream *stream,
+ snd_pcm_state_t state);
+
+#endif