/* 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_task_runtime : task runtime description
* @ list : list of all managed tasks
* @ input : input DMA buffer
* @ output : output DMA buffer
* @ seqno : sequence number
* @ input_size : really used data in the input buffer
* @ output_size : really used data in the output buffer
* @ flags : see SND_COMPRESS_TFLG_ *
* @ state : actual task state
* @ private_value : used by the lowlevel driver ( opaque )
*/
struct snd_compr_task_runtime {
struct list_head list;
struct dma_buf *input;
struct dma_buf *output;
u64 seqno;
u64 input_size;
u64 output_size;
u32 flags;
u8 state;
void *private_value;
};
/**
* 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
* @ active_tasks : count of active tasks
* @ total_tasks : count of all tasks
* @ task_seqno : last task sequence number ( ! = 0 )
* @ tasks : list of all tasks
*/
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;
#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
u32 active_tasks;
u32 total_tasks;
u64 task_seqno;
struct list_head tasks;
#endif
};
/**
* 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
* @ task_create : Create a set of input / output buffers for accel operations
* @ task_start : Start ( queue ) a task for accel operations
* @ task_stop : Stop ( dequeue ) a task for accel operations
* @ task_free : Free a set of input / output buffers for accel operations
*/
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);
#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
int (*task_create) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
int (*task_start) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
int (*task_stop) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
int (*task_free) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
#endif
};
/**
* 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;
#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_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)
{
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);
#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
void snd_compr_task_finished(struct snd_compr_stream *stream,
struct snd_compr_task_runtime *task);
#endif
#endif
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