blob: d91289c6f00e665740f1d13954e5283e74b837d0 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0
* compress_driver.h - compress offload driver definations
* Copyright (C) 2011 Intel Corporation
* Authors: Vinod Koul <>
* Pierre-Louis Bossart <>
#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
* @pause_in_draining: paused during draining state, 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;
bool pause_in_draining;
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
* @use_pause_in_draining: allow pause in draining, true when set
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;
bool use_pause_in_draining;
/* private: */
char id[64];
struct snd_info_entry *proc_root;
struct snd_info_entry *proc_info_entry;
/* compress device register APIs */
int snd_compress_new(struct snd_card *card, int device,
int type, const char *id, struct snd_compr *compr);
* snd_compr_use_pause_in_draining - Allow pause and resume in draining state
* @substream: compress substream to set
* Allow pause and resume in draining state.
* Only HW driver supports this transition can call this API.
static inline void snd_compr_use_pause_in_draining(struct snd_compr_stream *substream)
substream->device->use_pause_in_draining = true;
/* 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)
static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
if (snd_BUG_ON(!stream))
/* 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;
* 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);