include/sound/compress_driver.h

   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
  34 struct 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  */
  52 struct 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  */
  76 struct 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  */
 106 struct 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  */
 138 struct 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 */
 150 int snd_compress_register(struct snd_compr *device);
 151 int snd_compress_deregister(struct snd_compr *device);
 152 int 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  */
 163 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
 164 {
 165         wake_up(&stream->runtime->sleep);
 166 }
 167
 168 #endif