include/sound/compress_driver.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  *  compress_driver.h - compress offload driver definations
   4  *
   5  *  Copyright (C) 2011 Intel Corporation
   6  *  Authors:    Vinod Koul <vinod.koul@linux.intel.com>
   7  *              Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
   8  */
   9
  10 #ifndef __COMPRESS_DRIVER_H
  11 #define __COMPRESS_DRIVER_H
  12
  13 #include <linux/types.h>
  14 #include <linux/sched.h>
  15 #include <sound/core.h>
  16 #include <sound/compress_offload.h>
  17 #include <sound/asound.h>
  18 #include <sound/pcm.h>
  19
  20 struct snd_compr_ops;
  21
  22 /**
  23  * struct snd_compr_runtime: runtime stream description
  24  * @state: stream state
  25  * @ops: pointer to DSP callbacks
  26  * @dma_buffer_p: runtime dma buffer pointer
  27  * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
  28  *      DSP doesn't implement copy
  29  * @buffer_size: size of the above buffer
  30  * @fragment_size: size of buffer fragment in bytes
  31  * @fragments: number of such fragments
  32  * @total_bytes_available: cumulative number of bytes made available in
  33  *      the ring buffer
  34  * @total_bytes_transferred: cumulative bytes transferred by offload DSP
  35  * @sleep: poll sleep
  36  * @private_data: driver private data pointer
  37  */
  38 struct snd_compr_runtime {
  39         snd_pcm_state_t state;
  40         struct snd_compr_ops *ops;
  41         struct snd_dma_buffer *dma_buffer_p;
  42         void *buffer;
  43         u64 buffer_size;
  44         u32 fragment_size;
  45         u32 fragments;
  46         u64 total_bytes_available;
  47         u64 total_bytes_transferred;
  48         wait_queue_head_t sleep;
  49         void *private_data;
  50 };
  51
  52 /**
  53  * struct snd_compr_stream: compressed stream
  54  * @name: device name
  55  * @ops: pointer to DSP callbacks
  56  * @runtime: pointer to runtime structure
  57  * @device: device pointer
  58  * @error_work: delayed work used when closing the stream due to an error
  59  * @direction: stream direction, playback/recording
  60  * @metadata_set: metadata set flag, true when set
  61  * @next_track: has userspace signal next track transition, true when set
  62  * @private_data: pointer to DSP private data
  63  */
  64 struct snd_compr_stream {
  65         const char *name;
  66         struct snd_compr_ops *ops;
  67         struct snd_compr_runtime *runtime;
  68         struct snd_compr *device;
  69         struct delayed_work error_work;
  70         enum snd_compr_direction direction;
  71         bool metadata_set;
  72         bool next_track;
  73         void *private_data;
  74 };
  75
  76 /**
  77  * struct snd_compr_ops: compressed path DSP operations
  78  * @open: Open the compressed stream
  79  * This callback is mandatory and shall keep dsp ready to receive the stream
  80  * parameter
  81  * @free: Close the compressed stream, mandatory
  82  * @set_params: Sets the compressed stream parameters, mandatory
  83  * This can be called in during stream creation only to set codec params
  84  * and the stream properties
  85  * @get_params: retrieve the codec parameters, mandatory
  86  * @set_metadata: Set the metadata values for a stream
  87  * @get_metadata: retrieves the requested metadata values from stream
  88  * @trigger: Trigger operations like start, pause, resume, drain, stop.
  89  * This callback is mandatory
  90  * @pointer: Retrieve current h/w pointer information. Mandatory
  91  * @copy: Copy the compressed data to/from userspace, Optional
  92  * Can't be implemented if DSP supports mmap
  93  * @mmap: DSP mmap method to mmap DSP memory
  94  * @ack: Ack for DSP when data is written to audio buffer, Optional
  95  * Not valid if copy is implemented
  96  * @get_caps: Retrieve DSP capabilities, mandatory
  97  * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
  98  */
  99 struct snd_compr_ops {
 100         int (*open)(struct snd_compr_stream *stream);
 101         int (*free)(struct snd_compr_stream *stream);
 102         int (*set_params)(struct snd_compr_stream *stream,
 103                         struct snd_compr_params *params);
 104         int (*get_params)(struct snd_compr_stream *stream,
 105                         struct snd_codec *params);
 106         int (*set_metadata)(struct snd_compr_stream *stream,
 107                         struct snd_compr_metadata *metadata);
 108         int (*get_metadata)(struct snd_compr_stream *stream,
 109                         struct snd_compr_metadata *metadata);
 110         int (*trigger)(struct snd_compr_stream *stream, int cmd);
 111         int (*pointer)(struct snd_compr_stream *stream,
 112                         struct snd_compr_tstamp *tstamp);
 113         int (*copy)(struct snd_compr_stream *stream, char __user *buf,
 114                        size_t count);
 115         int (*mmap)(struct snd_compr_stream *stream,
 116                         struct vm_area_struct *vma);
 117         int (*ack)(struct snd_compr_stream *stream, size_t bytes);
 118         int (*get_caps) (struct snd_compr_stream *stream,
 119                         struct snd_compr_caps *caps);
 120         int (*get_codec_caps) (struct snd_compr_stream *stream,
 121                         struct snd_compr_codec_caps *codec);
 122 };
 123
 124 /**
 125  * struct snd_compr: Compressed device
 126  * @name: DSP device name
 127  * @dev: associated device instance
 128  * @ops: pointer to DSP callbacks
 129  * @private_data: pointer to DSP pvt data
 130  * @card: sound card pointer
 131  * @direction: Playback or capture direction
 132  * @lock: device lock
 133  * @device: device id
 134  */
 135 struct snd_compr {
 136         const char *name;
 137         struct device dev;
 138         struct snd_compr_ops *ops;
 139         void *private_data;
 140         struct snd_card *card;
 141         unsigned int direction;
 142         struct mutex lock;
 143         int device;
 144 #ifdef CONFIG_SND_VERBOSE_PROCFS
 145         /* private: */
 146         char id[64];
 147         struct snd_info_entry *proc_root;
 148         struct snd_info_entry *proc_info_entry;
 149 #endif
 150 };
 151
 152 /* compress device register APIs */
 153 int snd_compress_register(struct snd_compr *device);
 154 int snd_compress_deregister(struct snd_compr *device);
 155 int snd_compress_new(struct snd_card *card, int device,
 156                         int type, const char *id, struct snd_compr *compr);
 157
 158 /* dsp driver callback apis
 159  * For playback: driver should call snd_compress_fragment_elapsed() to let the
 160  * framework know that a fragment has been consumed from the ring buffer
 161  *
 162  * For recording: we want to know when a frame is available or when
 163  * at least one frame is available so snd_compress_frame_elapsed()
 164  * callback should be called when a encodeded frame is available
 165  */
 166 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
 167 {
 168         wake_up(&stream->runtime->sleep);
 169 }
 170
 171 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
 172 {
 173         if (snd_BUG_ON(!stream))
 174                 return;
 175
 176         if (stream->direction == SND_COMPRESS_PLAYBACK)
 177                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 178         else
 179                 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
 180
 181         wake_up(&stream->runtime->sleep);
 182 }
 183
 184 /**
 185  * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
 186  * @substream: compress substream to set
 187  * @bufp: the buffer information, NULL to clear
 188  *
 189  * Copy the buffer information to runtime buffer when @bufp is non-NULL.
 190  * Otherwise it clears the current buffer information.
 191  */
 192 static inline void snd_compr_set_runtime_buffer(
 193                                         struct snd_compr_stream *substream,
 194                                         struct snd_dma_buffer *bufp)
 195 {
 196         struct snd_compr_runtime *runtime = substream->runtime;
 197
 198         runtime->dma_buffer_p = bufp;
 199 }
 200
 201 int snd_compr_stop_error(struct snd_compr_stream *stream,
 202                          snd_pcm_state_t state);
 203
 204 #endif