linux/include/sound/compress_driver.h
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   1/*
   2 *  compress_driver.h - compress offload driver definations
   3 *
   4 *  Copyright (C) 2011 Intel Corporation
   5 *  Authors:    Vinod Koul <vinod.koul@linux.intel.com>
   6 *              Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
   7 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; version 2 of the License.
  12 *
  13 *  This program is distributed in the hope that it will be useful, but
  14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 *  General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License along
  19 *  with this program; if not, write to the Free Software Foundation, Inc.,
  20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21 *
  22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23 *
  24 */
  25#ifndef __COMPRESS_DRIVER_H
  26#define __COMPRESS_DRIVER_H
  27
  28#include <linux/types.h>
  29#include <linux/sched.h>
  30#include <sound/compress_offload.h>
  31#include <sound/asound.h>
  32#include <sound/pcm.h>
  33
  34struct snd_compr_ops;
  35
  36/**
  37 * struct snd_compr_runtime: runtime stream description
  38 * @state: stream state
  39 * @ops: pointer to DSP callbacks
  40 * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
  41 *      DSP doesn't implement copy
  42 * @buffer_size: size of the above buffer
  43 * @fragment_size: size of buffer fragment in bytes
  44 * @fragments: number of such fragments
  45 * @hw_pointer: offset of last location in buffer where DSP copied data
  46 * @app_pointer: offset of last location in buffer where app wrote data
  47 * @total_bytes_available: cumulative number of bytes made available in
  48 *      the ring buffer
  49 * @total_bytes_transferred: cumulative bytes transferred by offload DSP
  50 * @sleep: poll sleep
  51 */
  52struct snd_compr_runtime {
  53        snd_pcm_state_t state;
  54        struct snd_compr_ops *ops;
  55        void *buffer;
  56        u64 buffer_size;
  57        u32 fragment_size;
  58        u32 fragments;
  59        u64 hw_pointer;
  60        u64 app_pointer;
  61        u64 total_bytes_available;
  62        u64 total_bytes_transferred;
  63        wait_queue_head_t sleep;
  64        void *private_data;
  65};
  66
  67/**
  68 * struct snd_compr_stream: compressed stream
  69 * @name: device name
  70 * @ops: pointer to DSP callbacks
  71 * @runtime: pointer to runtime structure
  72 * @device: device pointer
  73 * @direction: stream direction, playback/recording
  74 * @private_data: pointer to DSP private data
  75 */
  76struct snd_compr_stream {
  77        const char *name;
  78        struct snd_compr_ops *ops;
  79        struct snd_compr_runtime *runtime;
  80        struct snd_compr *device;
  81        enum snd_compr_direction direction;
  82        void *private_data;
  83};
  84
  85/**
  86 * struct snd_compr_ops: compressed path DSP operations
  87 * @open: Open the compressed stream
  88 * This callback is mandatory and shall keep dsp ready to receive the stream
  89 * parameter
  90 * @free: Close the compressed stream, mandatory
  91 * @set_params: Sets the compressed stream parameters, mandatory
  92 * This can be called in during stream creation only to set codec params
  93 * and the stream properties
  94 * @get_params: retrieve the codec parameters, mandatory
  95 * @trigger: Trigger operations like start, pause, resume, drain, stop.
  96 * This callback is mandatory
  97 * @pointer: Retrieve current h/w pointer information. Mandatory
  98 * @copy: Copy the compressed data to/from userspace, Optional
  99 * Can't be implemented if DSP supports mmap
 100 * @mmap: DSP mmap method to mmap DSP memory
 101 * @ack: Ack for DSP when data is written to audio buffer, Optional
 102 * Not valid if copy is implemented
 103 * @get_caps: Retrieve DSP capabilities, mandatory
 104 * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
 105 */
 106struct snd_compr_ops {
 107        int (*open)(struct snd_compr_stream *stream);
 108        int (*free)(struct snd_compr_stream *stream);
 109        int (*set_params)(struct snd_compr_stream *stream,
 110                        struct snd_compr_params *params);
 111        int (*get_params)(struct snd_compr_stream *stream,
 112                        struct snd_codec *params);
 113        int (*trigger)(struct snd_compr_stream *stream, int cmd);
 114        int (*pointer)(struct snd_compr_stream *stream,
 115                        struct snd_compr_tstamp *tstamp);
 116        int (*copy)(struct snd_compr_stream *stream, const char __user *buf,
 117                       size_t count);
 118        int (*mmap)(struct snd_compr_stream *stream,
 119                        struct vm_area_struct *vma);
 120        int (*ack)(struct snd_compr_stream *stream, size_t bytes);
 121        int (*get_caps) (struct snd_compr_stream *stream,
 122                        struct snd_compr_caps *caps);
 123        int (*get_codec_caps) (struct snd_compr_stream *stream,
 124                        struct snd_compr_codec_caps *codec);
 125};
 126
 127/**
 128 * struct snd_compr: Compressed device
 129 * @name: DSP device name
 130 * @dev: Device pointer
 131 * @ops: pointer to DSP callbacks
 132 * @private_data: pointer to DSP pvt data
 133 * @card: sound card pointer
 134 * @direction: Playback or capture direction
 135 * @lock: device lock
 136 * @device: device id
 137 */
 138struct snd_compr {
 139        const char *name;
 140        struct device *dev;
 141        struct snd_compr_ops *ops;
 142        void *private_data;
 143        struct snd_card *card;
 144        unsigned int direction;
 145        struct mutex lock;
 146        int device;
 147};
 148
 149/* compress device register APIs */
 150int snd_compress_register(struct snd_compr *device);
 151int snd_compress_deregister(struct snd_compr *device);
 152int snd_compress_new(struct snd_card *card, int device,
 153                        int type, struct snd_compr *compr);
 154
 155/* dsp driver callback apis
 156 * For playback: driver should call snd_compress_fragment_elapsed() to let the
 157 * framework know that a fragment has been consumed from the ring buffer
 158 *
 159 * For recording: we want to know when a frame is available or when
 160 * at least one frame is available so snd_compress_frame_elapsed()
 161 * callback should be called when a encodeded frame is available
 162 */
 163static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
 164{
 165        wake_up(&stream->runtime->sleep);
 166}
 167
 168#endif
 169
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