186 lines
6.3 KiB
C
186 lines
6.3 KiB
C
/*
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* compress_driver.h - compress offload driver definations
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*
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* Copyright (C) 2011 Intel Corporation
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* Authors: Vinod Koul <vinod.koul@linux.intel.com>
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* Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#ifndef __COMPRESS_DRIVER_H
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#define __COMPRESS_DRIVER_H
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <sound/core.h>
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#include <sound/compress_offload.h>
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#include <sound/asound.h>
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#include <sound/pcm.h>
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struct snd_compr_ops;
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/**
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* struct snd_compr_runtime: runtime stream description
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* @state: stream state
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* @ops: pointer to DSP callbacks
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* @buffer: pointer to kernel buffer, valid only when not in mmap mode or
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* DSP doesn't implement copy
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* @buffer_size: size of the above buffer
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* @fragment_size: size of buffer fragment in bytes
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* @fragments: number of such fragments
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* @total_bytes_available: cumulative number of bytes made available in
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* the ring buffer
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* @total_bytes_transferred: cumulative bytes transferred by offload DSP
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* @sleep: poll sleep
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* @private_data: driver private data pointer
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*/
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struct snd_compr_runtime {
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snd_pcm_state_t state;
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struct snd_compr_ops *ops;
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void *buffer;
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u64 buffer_size;
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u32 fragment_size;
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u32 fragments;
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u64 total_bytes_available;
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u64 total_bytes_transferred;
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wait_queue_head_t sleep;
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void *private_data;
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};
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/**
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* struct snd_compr_stream: compressed stream
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* @name: device name
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* @ops: pointer to DSP callbacks
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* @runtime: pointer to runtime structure
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* @device: device pointer
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* @direction: stream direction, playback/recording
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* @metadata_set: metadata set flag, true when set
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* @next_track: has userspace signal next track transition, true when set
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* @private_data: pointer to DSP private data
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*/
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struct snd_compr_stream {
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const char *name;
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struct snd_compr_ops *ops;
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struct snd_compr_runtime *runtime;
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struct snd_compr *device;
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enum snd_compr_direction direction;
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bool metadata_set;
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bool next_track;
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void *private_data;
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};
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/**
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* struct snd_compr_ops: compressed path DSP operations
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* @open: Open the compressed stream
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* This callback is mandatory and shall keep dsp ready to receive the stream
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* parameter
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* @free: Close the compressed stream, mandatory
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* @set_params: Sets the compressed stream parameters, mandatory
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* This can be called in during stream creation only to set codec params
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* and the stream properties
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* @get_params: retrieve the codec parameters, mandatory
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* @set_metadata: Set the metadata values for a stream
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* @get_metadata: retrieves the requested metadata values from stream
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* @trigger: Trigger operations like start, pause, resume, drain, stop.
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* This callback is mandatory
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* @pointer: Retrieve current h/w pointer information. Mandatory
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* @copy: Copy the compressed data to/from userspace, Optional
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* Can't be implemented if DSP supports mmap
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* @mmap: DSP mmap method to mmap DSP memory
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* @ack: Ack for DSP when data is written to audio buffer, Optional
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* Not valid if copy is implemented
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* @get_caps: Retrieve DSP capabilities, mandatory
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* @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
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*/
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struct snd_compr_ops {
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int (*open)(struct snd_compr_stream *stream);
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int (*free)(struct snd_compr_stream *stream);
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int (*set_params)(struct snd_compr_stream *stream,
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struct snd_compr_params *params);
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int (*get_params)(struct snd_compr_stream *stream,
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struct snd_codec *params);
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int (*set_metadata)(struct snd_compr_stream *stream,
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struct snd_compr_metadata *metadata);
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int (*get_metadata)(struct snd_compr_stream *stream,
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struct snd_compr_metadata *metadata);
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int (*trigger)(struct snd_compr_stream *stream, int cmd);
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int (*pointer)(struct snd_compr_stream *stream,
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struct snd_compr_tstamp *tstamp);
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int (*copy)(struct snd_compr_stream *stream, char __user *buf,
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size_t count);
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int (*mmap)(struct snd_compr_stream *stream,
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struct vm_area_struct *vma);
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int (*ack)(struct snd_compr_stream *stream, size_t bytes);
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int (*get_caps) (struct snd_compr_stream *stream,
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struct snd_compr_caps *caps);
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int (*get_codec_caps) (struct snd_compr_stream *stream,
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struct snd_compr_codec_caps *codec);
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};
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/**
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* struct snd_compr: Compressed device
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* @name: DSP device name
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* @dev: associated device instance
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* @ops: pointer to DSP callbacks
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* @private_data: pointer to DSP pvt data
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* @card: sound card pointer
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* @direction: Playback or capture direction
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* @lock: device lock
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* @device: device id
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*/
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struct snd_compr {
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const char *name;
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struct device dev;
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struct snd_compr_ops *ops;
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void *private_data;
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struct snd_card *card;
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unsigned int direction;
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struct mutex lock;
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int device;
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};
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/* compress device register APIs */
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int snd_compress_register(struct snd_compr *device);
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int snd_compress_deregister(struct snd_compr *device);
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int snd_compress_new(struct snd_card *card, int device,
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int type, struct snd_compr *compr);
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/* dsp driver callback apis
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* For playback: driver should call snd_compress_fragment_elapsed() to let the
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* framework know that a fragment has been consumed from the ring buffer
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*
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* For recording: we want to know when a frame is available or when
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* at least one frame is available so snd_compress_frame_elapsed()
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* callback should be called when a encodeded frame is available
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*/
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static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
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{
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wake_up(&stream->runtime->sleep);
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}
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static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
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{
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if (snd_BUG_ON(!stream))
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return;
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stream->runtime->state = SNDRV_PCM_STATE_SETUP;
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wake_up(&stream->runtime->sleep);
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}
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#endif
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