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  * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
  27  *      DSP doesn't implement copy
  28  * @buffer_size: size of the above buffer
  29  * @fragment_size: size of buffer fragment in bytes
  30  * @fragments: number of such fragments
  31  * @total_bytes_available: cumulative number of bytes made available in
  32  *      the ring buffer
  33  * @total_bytes_transferred: cumulative bytes transferred by offload DSP
  34  * @sleep: poll sleep
  35  * @private_data: driver private data pointer
  36  * @dma_area: virtual buffer address
  37  * @dma_addr: physical buffer address (not accessible from main CPU)
  38  * @dma_bytes: size of DMA area
  39  * @dma_buffer_p: runtime dma buffer pointer
  40  */
  41 struct snd_compr_runtime {
  42         snd_pcm_state_t state;
  43         struct snd_compr_ops *ops;
  44         void *buffer;
  45         u64 buffer_size;
  46         u32 fragment_size;
  47         u32 fragments;
  48         u64 total_bytes_available;
  49         u64 total_bytes_transferred;
  50         wait_queue_head_t sleep;
  51         void *private_data;
  52
  53         unsigned char *dma_area;
  54         dma_addr_t dma_addr;
  55         size_t dma_bytes;
  56         struct snd_dma_buffer *dma_buffer_p;
  57 };
  58
  59 /**
  60  * struct snd_compr_stream: compressed stream
  61  * @name: device name
  62  * @ops: pointer to DSP callbacks
  63  * @runtime: pointer to runtime structure
  64  * @device: device pointer
  65  * @error_work: delayed work used when closing the stream due to an error
  66  * @direction: stream direction, playback/recording
  67  * @metadata_set: metadata set flag, true when set
  68  * @next_track: has userspace signal next track transition, true when set
  69  * @partial_drain: undergoing partial_drain for stream, true when set
  70  * @private_data: pointer to DSP private data
  71  * @dma_buffer: allocated buffer if any
  72  */
  73 struct snd_compr_stream {
  74         const char *name;
  75         struct snd_compr_ops *ops;
  76         struct snd_compr_runtime *runtime;
  77         struct snd_compr *device;
  78         struct delayed_work error_work;
  79         enum snd_compr_direction direction;
  80         bool metadata_set;
  81         bool next_track;
  82         bool partial_drain;
  83         void *private_data;
  84         struct snd_dma_buffer dma_buffer;
  85 };
  86
  87 /**
  88  * struct snd_compr_ops: compressed path DSP operations
  89  * @open: Open the compressed stream
  90  * This callback is mandatory and shall keep dsp ready to receive the stream
  91  * parameter
  92  * @free: Close the compressed stream, mandatory
  93  * @set_params: Sets the compressed stream parameters, mandatory
  94  * This can be called in during stream creation only to set codec params
  95  * and the stream properties
  96  * @get_params: retrieve the codec parameters, mandatory
  97  * @set_metadata: Set the metadata values for a stream
  98  * @get_metadata: retrieves the requested metadata values from stream
  99  * @trigger: Trigger operations like start, pause, resume, drain, stop.
 100  * This callback is mandatory
 101  * @pointer: Retrieve current h/w pointer information. Mandatory
 102  * @copy: Copy the compressed data to/from userspace, Optional
 103  * Can't be implemented if DSP supports mmap
 104  * @mmap: DSP mmap method to mmap DSP memory
 105  * @ack: Ack for DSP when data is written to audio buffer, Optional
 106  * Not valid if copy is implemented
 107  * @get_caps: Retrieve DSP capabilities, mandatory
 108  * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
 109  */
 110 struct snd_compr_ops {
 111         int (*open)(struct snd_compr_stream *stream);
 112         int (*free)(struct snd_compr_stream *stream);
 113         int (*set_params)(struct snd_compr_stream *stream,
 114                         struct snd_compr_params *params);
 115         int (*get_params)(struct snd_compr_stream *stream,
 116                         struct snd_codec *params);
 117         int (*set_metadata)(struct snd_compr_stream *stream,
 118                         struct snd_compr_metadata *metadata);
 119         int (*get_metadata)(struct snd_compr_stream *stream,
 120                         struct snd_compr_metadata *metadata);
 121         int (*trigger)(struct snd_compr_stream *stream, int cmd);
 122         int (*pointer)(struct snd_compr_stream *stream,
 123                         struct snd_compr_tstamp *tstamp);
 124         int (*copy)(struct snd_compr_stream *stream, char __user *buf,
 125                        size_t count);
 126         int (*mmap)(struct snd_compr_stream *stream,
 127                         struct vm_area_struct *vma);
 128         int (*ack)(struct snd_compr_stream *stream, size_t bytes);
 129         int (*get_caps) (struct snd_compr_stream *stream,
 130                         struct snd_compr_caps *caps);
 131         int (*get_codec_caps) (struct snd_compr_stream *stream,
 132                         struct snd_compr_codec_caps *codec);
 133 };
 134
 135 /**
 136  * struct snd_compr: Compressed device
 137  * @name: DSP device name
 138  * @dev: associated device instance
 139  * @ops: pointer to DSP callbacks
 140  * @private_data: pointer to DSP pvt data
 141  * @card: sound card pointer
 142  * @direction: Playback or capture direction
 143  * @lock: device lock
 144  * @device: device id
 145  */
 146 struct snd_compr {
 147         const char *name;
 148         struct device dev;
 149         struct snd_compr_ops *ops;
 150         void *private_data;
 151         struct snd_card *card;
 152         unsigned int direction;
 153         struct mutex lock;
 154         int device;
 155 #ifdef CONFIG_SND_VERBOSE_PROCFS
 156         /* private: */
 157         char id[64];
 158         struct snd_info_entry *proc_root;
 159         struct snd_info_entry *proc_info_entry;
 160 #endif
 161 };
 162
 163 /* compress device register APIs */
 164 int snd_compress_register(struct snd_compr *device);
 165 int snd_compress_deregister(struct snd_compr *device);
 166 int snd_compress_new(struct snd_card *card, int device,
 167                         int type, const char *id, struct snd_compr *compr);
 168
 169 /* dsp driver callback apis
 170  * For playback: driver should call snd_compress_fragment_elapsed() to let the
 171  * framework know that a fragment has been consumed from the ring buffer
 172  *
 173  * For recording: we want to know when a frame is available or when
 174  * at least one frame is available so snd_compress_frame_elapsed()
 175  * callback should be called when a encodeded frame is available
 176  */
 177 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
 178 {
 179         wake_up(&stream->runtime->sleep);
 180 }
 181
 182 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
 183 {
 184         if (snd_BUG_ON(!stream))
 185                 return;
 186
 187         /* for partial_drain case we are back to running state on success */
 188         if (stream->partial_drain) {
 189                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 190                 stream->partial_drain = false; /* clear this flag as well */
 191         } else {
 192                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 193         }
 194
 195         wake_up(&stream->runtime->sleep);
 196 }
 197
 198 /**
 199  * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
 200  * @stream: compress stream to set
 201  * @bufp: the buffer information, NULL to clear
 202  *
 203  * Copy the buffer information to runtime buffer when @bufp is non-NULL.
 204  * Otherwise it clears the current buffer information.
 205  */
 206 static inline void
 207 snd_compr_set_runtime_buffer(struct snd_compr_stream *stream,
 208                              struct snd_dma_buffer *bufp)
 209 {
 210         struct snd_compr_runtime *runtime = stream->runtime;
 211
 212         if (bufp) {
 213                 runtime->dma_buffer_p = bufp;
 214                 runtime->dma_area = bufp->area;
 215                 runtime->dma_addr = bufp->addr;
 216                 runtime->dma_bytes = bufp->bytes;
 217         } else {
 218                 runtime->dma_buffer_p = NULL;
 219                 runtime->dma_area = NULL;
 220                 runtime->dma_addr = 0;
 221                 runtime->dma_bytes = 0;
 222         }
 223 }
 224
 225 int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size);
 226 int snd_compr_free_pages(struct snd_compr_stream *stream);
 227
 228 int snd_compr_stop_error(struct snd_compr_stream *stream,
 229                          snd_pcm_state_t state);
 230
 231 #endif