| 1 | /* SPDX-License-Identifier: BSD-3-Clause */ |
| 2 | /* |
| 3 | * Copyright (C) 2021 OpenSynergy GmbH |
| 4 | */ |
| 5 | #ifndef VIRTIO_SND_IF_H |
| 6 | #define VIRTIO_SND_IF_H |
| 7 | |
| 8 | #include "standard-headers/linux/virtio_types.h" |
| 9 | |
| 10 | /******************************************************************************* |
| 11 | * FEATURE BITS |
| 12 | */ |
| 13 | enum { |
| 14 | /* device supports control elements */ |
| 15 | VIRTIO_SND_F_CTLS = 0 |
| 16 | }; |
| 17 | |
| 18 | /******************************************************************************* |
| 19 | * CONFIGURATION SPACE |
| 20 | */ |
| 21 | struct virtio_snd_config { |
| 22 | /* # of available physical jacks */ |
| 23 | uint32_t jacks; |
| 24 | /* # of available PCM streams */ |
| 25 | uint32_t streams; |
| 26 | /* # of available channel maps */ |
| 27 | uint32_t chmaps; |
| 28 | /* # of available control elements (if VIRTIO_SND_F_CTLS) */ |
| 29 | uint32_t controls; |
| 30 | }; |
| 31 | |
| 32 | enum { |
| 33 | /* device virtqueue indexes */ |
| 34 | VIRTIO_SND_VQ_CONTROL = 0, |
| 35 | VIRTIO_SND_VQ_EVENT, |
| 36 | VIRTIO_SND_VQ_TX, |
| 37 | VIRTIO_SND_VQ_RX, |
| 38 | /* # of device virtqueues */ |
| 39 | VIRTIO_SND_VQ_MAX |
| 40 | }; |
| 41 | |
| 42 | /******************************************************************************* |
| 43 | * COMMON DEFINITIONS |
| 44 | */ |
| 45 | |
| 46 | /* supported dataflow directions */ |
| 47 | enum { |
| 48 | VIRTIO_SND_D_OUTPUT = 0, |
| 49 | VIRTIO_SND_D_INPUT |
| 50 | }; |
| 51 | |
| 52 | enum { |
| 53 | /* jack control request types */ |
| 54 | VIRTIO_SND_R_JACK_INFO = 1, |
| 55 | VIRTIO_SND_R_JACK_REMAP, |
| 56 | |
| 57 | /* PCM control request types */ |
| 58 | VIRTIO_SND_R_PCM_INFO = 0x0100, |
| 59 | VIRTIO_SND_R_PCM_SET_PARAMS, |
| 60 | VIRTIO_SND_R_PCM_PREPARE, |
| 61 | VIRTIO_SND_R_PCM_RELEASE, |
| 62 | VIRTIO_SND_R_PCM_START, |
| 63 | VIRTIO_SND_R_PCM_STOP, |
| 64 | |
| 65 | /* channel map control request types */ |
| 66 | VIRTIO_SND_R_CHMAP_INFO = 0x0200, |
| 67 | |
| 68 | /* control element request types */ |
| 69 | VIRTIO_SND_R_CTL_INFO = 0x0300, |
| 70 | VIRTIO_SND_R_CTL_ENUM_ITEMS, |
| 71 | VIRTIO_SND_R_CTL_READ, |
| 72 | VIRTIO_SND_R_CTL_WRITE, |
| 73 | VIRTIO_SND_R_CTL_TLV_READ, |
| 74 | VIRTIO_SND_R_CTL_TLV_WRITE, |
| 75 | VIRTIO_SND_R_CTL_TLV_COMMAND, |
| 76 | |
| 77 | /* jack event types */ |
| 78 | VIRTIO_SND_EVT_JACK_CONNECTED = 0x1000, |
| 79 | VIRTIO_SND_EVT_JACK_DISCONNECTED, |
| 80 | |
| 81 | /* PCM event types */ |
| 82 | VIRTIO_SND_EVT_PCM_PERIOD_ELAPSED = 0x1100, |
| 83 | VIRTIO_SND_EVT_PCM_XRUN, |
| 84 | |
| 85 | /* control element event types */ |
| 86 | VIRTIO_SND_EVT_CTL_NOTIFY = 0x1200, |
| 87 | |
| 88 | /* common status codes */ |
| 89 | VIRTIO_SND_S_OK = 0x8000, |
| 90 | VIRTIO_SND_S_BAD_MSG, |
| 91 | VIRTIO_SND_S_NOT_SUPP, |
| 92 | VIRTIO_SND_S_IO_ERR |
| 93 | }; |
| 94 | |
| 95 | /* common header */ |
| 96 | struct virtio_snd_hdr { |
| 97 | uint32_t code; |
| 98 | }; |
| 99 | |
| 100 | /* event notification */ |
| 101 | struct virtio_snd_event { |
| 102 | /* VIRTIO_SND_EVT_XXX */ |
| 103 | struct virtio_snd_hdr hdr; |
| 104 | /* optional event data */ |
| 105 | uint32_t data; |
| 106 | }; |
| 107 | |
| 108 | /* common control request to query an item information */ |
| 109 | struct virtio_snd_query_info { |
| 110 | /* VIRTIO_SND_R_XXX_INFO */ |
| 111 | struct virtio_snd_hdr hdr; |
| 112 | /* item start identifier */ |
| 113 | uint32_t start_id; |
| 114 | /* item count to query */ |
| 115 | uint32_t count; |
| 116 | /* item information size in bytes */ |
| 117 | uint32_t size; |
| 118 | }; |
| 119 | |
| 120 | /* common item information header */ |
| 121 | struct virtio_snd_info { |
| 122 | /* function group node id (High Definition Audio Specification 7.1.2) */ |
| 123 | uint32_t hda_fn_nid; |
| 124 | }; |
| 125 | |
| 126 | /******************************************************************************* |
| 127 | * JACK CONTROL MESSAGES |
| 128 | */ |
| 129 | struct virtio_snd_jack_hdr { |
| 130 | /* VIRTIO_SND_R_JACK_XXX */ |
| 131 | struct virtio_snd_hdr hdr; |
| 132 | /* 0 ... virtio_snd_config::jacks - 1 */ |
| 133 | uint32_t jack_id; |
| 134 | }; |
| 135 | |
| 136 | /* supported jack features */ |
| 137 | enum { |
| 138 | VIRTIO_SND_JACK_F_REMAP = 0 |
| 139 | }; |
| 140 | |
| 141 | struct virtio_snd_jack_info { |
| 142 | /* common header */ |
| 143 | struct virtio_snd_info hdr; |
| 144 | /* supported feature bit map (1 << VIRTIO_SND_JACK_F_XXX) */ |
| 145 | uint32_t features; |
| 146 | /* pin configuration (High Definition Audio Specification 7.3.3.31) */ |
| 147 | uint32_t hda_reg_defconf; |
| 148 | /* pin capabilities (High Definition Audio Specification 7.3.4.9) */ |
| 149 | uint32_t hda_reg_caps; |
| 150 | /* current jack connection status (0: disconnected, 1: connected) */ |
| 151 | uint8_t connected; |
| 152 | |
| 153 | uint8_t padding[7]; |
| 154 | }; |
| 155 | |
| 156 | /* jack remapping control request */ |
| 157 | struct virtio_snd_jack_remap { |
| 158 | /* .code = VIRTIO_SND_R_JACK_REMAP */ |
| 159 | struct virtio_snd_jack_hdr hdr; |
| 160 | /* selected association number */ |
| 161 | uint32_t association; |
| 162 | /* selected sequence number */ |
| 163 | uint32_t sequence; |
| 164 | }; |
| 165 | |
| 166 | /******************************************************************************* |
| 167 | * PCM CONTROL MESSAGES |
| 168 | */ |
| 169 | struct virtio_snd_pcm_hdr { |
| 170 | /* VIRTIO_SND_R_PCM_XXX */ |
| 171 | struct virtio_snd_hdr hdr; |
| 172 | /* 0 ... virtio_snd_config::streams - 1 */ |
| 173 | uint32_t stream_id; |
| 174 | }; |
| 175 | |
| 176 | /* supported PCM stream features */ |
| 177 | enum { |
| 178 | VIRTIO_SND_PCM_F_SHMEM_HOST = 0, |
| 179 | VIRTIO_SND_PCM_F_SHMEM_GUEST, |
| 180 | VIRTIO_SND_PCM_F_MSG_POLLING, |
| 181 | VIRTIO_SND_PCM_F_EVT_SHMEM_PERIODS, |
| 182 | VIRTIO_SND_PCM_F_EVT_XRUNS |
| 183 | }; |
| 184 | |
| 185 | /* supported PCM sample formats */ |
| 186 | enum { |
| 187 | /* analog formats (width / physical width) */ |
| 188 | VIRTIO_SND_PCM_FMT_IMA_ADPCM = 0, /* 4 / 4 bits */ |
| 189 | VIRTIO_SND_PCM_FMT_MU_LAW, /* 8 / 8 bits */ |
| 190 | VIRTIO_SND_PCM_FMT_A_LAW, /* 8 / 8 bits */ |
| 191 | VIRTIO_SND_PCM_FMT_S8, /* 8 / 8 bits */ |
| 192 | VIRTIO_SND_PCM_FMT_U8, /* 8 / 8 bits */ |
| 193 | VIRTIO_SND_PCM_FMT_S16, /* 16 / 16 bits */ |
| 194 | VIRTIO_SND_PCM_FMT_U16, /* 16 / 16 bits */ |
| 195 | VIRTIO_SND_PCM_FMT_S18_3, /* 18 / 24 bits */ |
| 196 | VIRTIO_SND_PCM_FMT_U18_3, /* 18 / 24 bits */ |
| 197 | VIRTIO_SND_PCM_FMT_S20_3, /* 20 / 24 bits */ |
| 198 | VIRTIO_SND_PCM_FMT_U20_3, /* 20 / 24 bits */ |
| 199 | VIRTIO_SND_PCM_FMT_S24_3, /* 24 / 24 bits */ |
| 200 | VIRTIO_SND_PCM_FMT_U24_3, /* 24 / 24 bits */ |
| 201 | VIRTIO_SND_PCM_FMT_S20, /* 20 / 32 bits */ |
| 202 | VIRTIO_SND_PCM_FMT_U20, /* 20 / 32 bits */ |
| 203 | VIRTIO_SND_PCM_FMT_S24, /* 24 / 32 bits */ |
| 204 | VIRTIO_SND_PCM_FMT_U24, /* 24 / 32 bits */ |
| 205 | VIRTIO_SND_PCM_FMT_S32, /* 32 / 32 bits */ |
| 206 | VIRTIO_SND_PCM_FMT_U32, /* 32 / 32 bits */ |
| 207 | VIRTIO_SND_PCM_FMT_FLOAT, /* 32 / 32 bits */ |
| 208 | VIRTIO_SND_PCM_FMT_FLOAT64, /* 64 / 64 bits */ |
| 209 | /* digital formats (width / physical width) */ |
| 210 | VIRTIO_SND_PCM_FMT_DSD_U8, /* 8 / 8 bits */ |
| 211 | VIRTIO_SND_PCM_FMT_DSD_U16, /* 16 / 16 bits */ |
| 212 | VIRTIO_SND_PCM_FMT_DSD_U32, /* 32 / 32 bits */ |
| 213 | VIRTIO_SND_PCM_FMT_IEC958_SUBFRAME /* 32 / 32 bits */ |
| 214 | }; |
| 215 | |
| 216 | /* supported PCM frame rates */ |
| 217 | enum { |
| 218 | VIRTIO_SND_PCM_RATE_5512 = 0, |
| 219 | VIRTIO_SND_PCM_RATE_8000, |
| 220 | VIRTIO_SND_PCM_RATE_11025, |
| 221 | VIRTIO_SND_PCM_RATE_16000, |
| 222 | VIRTIO_SND_PCM_RATE_22050, |
| 223 | VIRTIO_SND_PCM_RATE_32000, |
| 224 | VIRTIO_SND_PCM_RATE_44100, |
| 225 | VIRTIO_SND_PCM_RATE_48000, |
| 226 | VIRTIO_SND_PCM_RATE_64000, |
| 227 | VIRTIO_SND_PCM_RATE_88200, |
| 228 | VIRTIO_SND_PCM_RATE_96000, |
| 229 | VIRTIO_SND_PCM_RATE_176400, |
| 230 | VIRTIO_SND_PCM_RATE_192000, |
| 231 | VIRTIO_SND_PCM_RATE_384000 |
| 232 | }; |
| 233 | |
| 234 | struct virtio_snd_pcm_info { |
| 235 | /* common header */ |
| 236 | struct virtio_snd_info hdr; |
| 237 | /* supported feature bit map (1 << VIRTIO_SND_PCM_F_XXX) */ |
| 238 | uint32_t features; |
| 239 | /* supported sample format bit map (1 << VIRTIO_SND_PCM_FMT_XXX) */ |
| 240 | uint64_t formats; |
| 241 | /* supported frame rate bit map (1 << VIRTIO_SND_PCM_RATE_XXX) */ |
| 242 | uint64_t rates; |
| 243 | /* dataflow direction (VIRTIO_SND_D_XXX) */ |
| 244 | uint8_t direction; |
| 245 | /* minimum # of supported channels */ |
| 246 | uint8_t channels_min; |
| 247 | /* maximum # of supported channels */ |
| 248 | uint8_t channels_max; |
| 249 | |
| 250 | uint8_t padding[5]; |
| 251 | }; |
| 252 | |
| 253 | /* set PCM stream format */ |
| 254 | struct virtio_snd_pcm_set_params { |
| 255 | /* .code = VIRTIO_SND_R_PCM_SET_PARAMS */ |
| 256 | struct virtio_snd_pcm_hdr hdr; |
| 257 | /* size of the hardware buffer */ |
| 258 | uint32_t buffer_bytes; |
| 259 | /* size of the hardware period */ |
| 260 | uint32_t period_bytes; |
| 261 | /* selected feature bit map (1 << VIRTIO_SND_PCM_F_XXX) */ |
| 262 | uint32_t features; |
| 263 | /* selected # of channels */ |
| 264 | uint8_t channels; |
| 265 | /* selected sample format (VIRTIO_SND_PCM_FMT_XXX) */ |
| 266 | uint8_t format; |
| 267 | /* selected frame rate (VIRTIO_SND_PCM_RATE_XXX) */ |
| 268 | uint8_t rate; |
| 269 | |
| 270 | uint8_t padding; |
| 271 | }; |
| 272 | |
| 273 | /******************************************************************************* |
| 274 | * PCM I/O MESSAGES |
| 275 | */ |
| 276 | |
| 277 | /* I/O request header */ |
| 278 | struct virtio_snd_pcm_xfer { |
| 279 | /* 0 ... virtio_snd_config::streams - 1 */ |
| 280 | uint32_t stream_id; |
| 281 | }; |
| 282 | |
| 283 | /* I/O request status */ |
| 284 | struct virtio_snd_pcm_status { |
| 285 | /* VIRTIO_SND_S_XXX */ |
| 286 | uint32_t status; |
| 287 | /* current device latency */ |
| 288 | uint32_t latency_bytes; |
| 289 | }; |
| 290 | |
| 291 | /******************************************************************************* |
| 292 | * CHANNEL MAP CONTROL MESSAGES |
| 293 | */ |
| 294 | struct virtio_snd_chmap_hdr { |
| 295 | /* VIRTIO_SND_R_CHMAP_XXX */ |
| 296 | struct virtio_snd_hdr hdr; |
| 297 | /* 0 ... virtio_snd_config::chmaps - 1 */ |
| 298 | uint32_t chmap_id; |
| 299 | }; |
| 300 | |
| 301 | /* standard channel position definition */ |
| 302 | enum { |
| 303 | VIRTIO_SND_CHMAP_NONE = 0, /* undefined */ |
| 304 | VIRTIO_SND_CHMAP_NA, /* silent */ |
| 305 | VIRTIO_SND_CHMAP_MONO, /* mono stream */ |
| 306 | VIRTIO_SND_CHMAP_FL, /* front left */ |
| 307 | VIRTIO_SND_CHMAP_FR, /* front right */ |
| 308 | VIRTIO_SND_CHMAP_RL, /* rear left */ |
| 309 | VIRTIO_SND_CHMAP_RR, /* rear right */ |
| 310 | VIRTIO_SND_CHMAP_FC, /* front center */ |
| 311 | VIRTIO_SND_CHMAP_LFE, /* low frequency (LFE) */ |
| 312 | VIRTIO_SND_CHMAP_SL, /* side left */ |
| 313 | VIRTIO_SND_CHMAP_SR, /* side right */ |
| 314 | VIRTIO_SND_CHMAP_RC, /* rear center */ |
| 315 | VIRTIO_SND_CHMAP_FLC, /* front left center */ |
| 316 | VIRTIO_SND_CHMAP_FRC, /* front right center */ |
| 317 | VIRTIO_SND_CHMAP_RLC, /* rear left center */ |
| 318 | VIRTIO_SND_CHMAP_RRC, /* rear right center */ |
| 319 | VIRTIO_SND_CHMAP_FLW, /* front left wide */ |
| 320 | VIRTIO_SND_CHMAP_FRW, /* front right wide */ |
| 321 | VIRTIO_SND_CHMAP_FLH, /* front left high */ |
| 322 | VIRTIO_SND_CHMAP_FCH, /* front center high */ |
| 323 | VIRTIO_SND_CHMAP_FRH, /* front right high */ |
| 324 | VIRTIO_SND_CHMAP_TC, /* top center */ |
| 325 | VIRTIO_SND_CHMAP_TFL, /* top front left */ |
| 326 | VIRTIO_SND_CHMAP_TFR, /* top front right */ |
| 327 | VIRTIO_SND_CHMAP_TFC, /* top front center */ |
| 328 | VIRTIO_SND_CHMAP_TRL, /* top rear left */ |
| 329 | VIRTIO_SND_CHMAP_TRR, /* top rear right */ |
| 330 | VIRTIO_SND_CHMAP_TRC, /* top rear center */ |
| 331 | VIRTIO_SND_CHMAP_TFLC, /* top front left center */ |
| 332 | VIRTIO_SND_CHMAP_TFRC, /* top front right center */ |
| 333 | VIRTIO_SND_CHMAP_TSL, /* top side left */ |
| 334 | VIRTIO_SND_CHMAP_TSR, /* top side right */ |
| 335 | VIRTIO_SND_CHMAP_LLFE, /* left LFE */ |
| 336 | VIRTIO_SND_CHMAP_RLFE, /* right LFE */ |
| 337 | VIRTIO_SND_CHMAP_BC, /* bottom center */ |
| 338 | VIRTIO_SND_CHMAP_BLC, /* bottom left center */ |
| 339 | VIRTIO_SND_CHMAP_BRC /* bottom right center */ |
| 340 | }; |
| 341 | |
| 342 | /* maximum possible number of channels */ |
| 343 | #define VIRTIO_SND_CHMAP_MAX_SIZE 18 |
| 344 | |
| 345 | struct virtio_snd_chmap_info { |
| 346 | /* common header */ |
| 347 | struct virtio_snd_info hdr; |
| 348 | /* dataflow direction (VIRTIO_SND_D_XXX) */ |
| 349 | uint8_t direction; |
| 350 | /* # of valid channel position values */ |
| 351 | uint8_t channels; |
| 352 | /* channel position values (VIRTIO_SND_CHMAP_XXX) */ |
| 353 | uint8_t positions[VIRTIO_SND_CHMAP_MAX_SIZE]; |
| 354 | }; |
| 355 | |
| 356 | /******************************************************************************* |
| 357 | * CONTROL ELEMENTS MESSAGES |
| 358 | */ |
| 359 | struct virtio_snd_ctl_hdr { |
| 360 | /* VIRTIO_SND_R_CTL_XXX */ |
| 361 | struct virtio_snd_hdr hdr; |
| 362 | /* 0 ... virtio_snd_config::controls - 1 */ |
| 363 | uint32_t control_id; |
| 364 | }; |
| 365 | |
| 366 | /* supported roles for control elements */ |
| 367 | enum { |
| 368 | VIRTIO_SND_CTL_ROLE_UNDEFINED = 0, |
| 369 | VIRTIO_SND_CTL_ROLE_VOLUME, |
| 370 | VIRTIO_SND_CTL_ROLE_MUTE, |
| 371 | VIRTIO_SND_CTL_ROLE_GAIN |
| 372 | }; |
| 373 | |
| 374 | /* supported value types for control elements */ |
| 375 | enum { |
| 376 | VIRTIO_SND_CTL_TYPE_BOOLEAN = 0, |
| 377 | VIRTIO_SND_CTL_TYPE_INTEGER, |
| 378 | VIRTIO_SND_CTL_TYPE_INTEGER64, |
| 379 | VIRTIO_SND_CTL_TYPE_ENUMERATED, |
| 380 | VIRTIO_SND_CTL_TYPE_BYTES, |
| 381 | VIRTIO_SND_CTL_TYPE_IEC958 |
| 382 | }; |
| 383 | |
| 384 | /* supported access rights for control elements */ |
| 385 | enum { |
| 386 | VIRTIO_SND_CTL_ACCESS_READ = 0, |
| 387 | VIRTIO_SND_CTL_ACCESS_WRITE, |
| 388 | VIRTIO_SND_CTL_ACCESS_VOLATILE, |
| 389 | VIRTIO_SND_CTL_ACCESS_INACTIVE, |
| 390 | VIRTIO_SND_CTL_ACCESS_TLV_READ, |
| 391 | VIRTIO_SND_CTL_ACCESS_TLV_WRITE, |
| 392 | VIRTIO_SND_CTL_ACCESS_TLV_COMMAND |
| 393 | }; |
| 394 | |
| 395 | struct virtio_snd_ctl_info { |
| 396 | /* common header */ |
| 397 | struct virtio_snd_info hdr; |
| 398 | /* element role (VIRTIO_SND_CTL_ROLE_XXX) */ |
| 399 | uint32_t role; |
| 400 | /* element value type (VIRTIO_SND_CTL_TYPE_XXX) */ |
| 401 | uint32_t type; |
| 402 | /* element access right bit map (1 << VIRTIO_SND_CTL_ACCESS_XXX) */ |
| 403 | uint32_t access; |
| 404 | /* # of members in the element value */ |
| 405 | uint32_t count; |
| 406 | /* index for an element with a non-unique name */ |
| 407 | uint32_t index; |
| 408 | /* name identifier string for the element */ |
| 409 | uint8_t name[44]; |
| 410 | /* additional information about the element's value */ |
| 411 | union { |
| 412 | /* VIRTIO_SND_CTL_TYPE_INTEGER */ |
| 413 | struct { |
| 414 | /* minimum supported value */ |
| 415 | uint32_t min; |
| 416 | /* maximum supported value */ |
| 417 | uint32_t max; |
| 418 | /* fixed step size for value (0 = variable size) */ |
| 419 | uint32_t step; |
| 420 | } integer; |
| 421 | /* VIRTIO_SND_CTL_TYPE_INTEGER64 */ |
| 422 | struct { |
| 423 | /* minimum supported value */ |
| 424 | uint64_t min; |
| 425 | /* maximum supported value */ |
| 426 | uint64_t max; |
| 427 | /* fixed step size for value (0 = variable size) */ |
| 428 | uint64_t step; |
| 429 | } integer64; |
| 430 | /* VIRTIO_SND_CTL_TYPE_ENUMERATED */ |
| 431 | struct { |
| 432 | /* # of options supported for value */ |
| 433 | uint32_t items; |
| 434 | } enumerated; |
| 435 | } value; |
| 436 | }; |
| 437 | |
| 438 | struct virtio_snd_ctl_enum_item { |
| 439 | /* option name */ |
| 440 | uint8_t item[64]; |
| 441 | }; |
| 442 | |
| 443 | struct virtio_snd_ctl_iec958 { |
| 444 | /* AES/IEC958 channel status bits */ |
| 445 | uint8_t status[24]; |
| 446 | /* AES/IEC958 subcode bits */ |
| 447 | uint8_t subcode[147]; |
| 448 | /* nothing */ |
| 449 | uint8_t pad; |
| 450 | /* AES/IEC958 subframe bits */ |
| 451 | uint8_t dig_subframe[4]; |
| 452 | }; |
| 453 | |
| 454 | struct virtio_snd_ctl_value { |
| 455 | union { |
| 456 | /* VIRTIO_SND_CTL_TYPE_BOOLEAN|INTEGER value */ |
| 457 | uint32_t integer[128]; |
| 458 | /* VIRTIO_SND_CTL_TYPE_INTEGER64 value */ |
| 459 | uint64_t integer64[64]; |
| 460 | /* VIRTIO_SND_CTL_TYPE_ENUMERATED value (option indexes) */ |
| 461 | uint32_t enumerated[128]; |
| 462 | /* VIRTIO_SND_CTL_TYPE_BYTES value */ |
| 463 | uint8_t bytes[512]; |
| 464 | /* VIRTIO_SND_CTL_TYPE_IEC958 value */ |
| 465 | struct virtio_snd_ctl_iec958 iec958; |
| 466 | } value; |
| 467 | }; |
| 468 | |
| 469 | /* supported event reason types */ |
| 470 | enum { |
| 471 | /* element's value has changed */ |
| 472 | VIRTIO_SND_CTL_EVT_MASK_VALUE = 0, |
| 473 | /* element's information has changed */ |
| 474 | VIRTIO_SND_CTL_EVT_MASK_INFO, |
| 475 | /* element's metadata has changed */ |
| 476 | VIRTIO_SND_CTL_EVT_MASK_TLV |
| 477 | }; |
| 478 | |
| 479 | struct virtio_snd_ctl_event { |
| 480 | /* VIRTIO_SND_EVT_CTL_NOTIFY */ |
| 481 | struct virtio_snd_hdr hdr; |
| 482 | /* 0 ... virtio_snd_config::controls - 1 */ |
| 483 | uint16_t control_id; |
| 484 | /* event reason bit map (1 << VIRTIO_SND_CTL_EVT_MASK_XXX) */ |
| 485 | uint16_t mask; |
| 486 | }; |
| 487 | |
| 488 | #endif /* VIRTIO_SND_IF_H */ |