1 /* 2 * <linux/usb/audio.h> -- USB Audio definitions. 3 * 4 * Copyright (C) 2006 Thumtronics Pty Ltd. 5 * Developed for Thumtronics by Grey Innovation 6 * Ben Williamson <[email protected]> 7 * 8 * This software is distributed under the terms of the GNU General Public 9 * License ("GPL") version 2, as published by the Free Software Foundation. 10 * 11 * This file holds USB constants and structures defined 12 * by the USB Device Class Definition for Audio Devices. 13 * Comments below reference relevant sections of that document: 14 * 15 * http://www.usb.org/developers/devclass_docs/audio10.pdf 16 * 17 * Types and defines in this file are either specific to version 1.0 of 18 * this standard or common for newer versions. 19 */ 20 21 #ifndef __LINUX_USB_AUDIO_H 22 #define __LINUX_USB_AUDIO_H 23 24 #include <linux/types.h> 25 26 /* bInterfaceProtocol values to denote the version of the standard used */ 27 #define UAC_VERSION_1 0x00 28 #define UAC_VERSION_2 0x20 29 30 /* A.2 Audio Interface Subclass Codes */ 31 #define USB_SUBCLASS_AUDIOCONTROL 0x01 32 #define USB_SUBCLASS_AUDIOSTREAMING 0x02 33 #define USB_SUBCLASS_MIDISTREAMING 0x03 34 35 /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */ 36 #define UAC_HEADER 0x01 37 #define UAC_INPUT_TERMINAL 0x02 38 #define UAC_OUTPUT_TERMINAL 0x03 39 #define UAC_MIXER_UNIT 0x04 40 #define UAC_SELECTOR_UNIT 0x05 41 #define UAC_FEATURE_UNIT 0x06 42 #define UAC_PROCESSING_UNIT_V1 0x07 43 #define UAC_EXTENSION_UNIT_V1 0x08 44 45 /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */ 46 #define UAC_AS_GENERAL 0x01 47 #define UAC_FORMAT_TYPE 0x02 48 #define UAC_FORMAT_SPECIFIC 0x03 49 50 /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */ 51 #define UAC_EP_GENERAL 0x01 52 53 /* A.9 Audio Class-Specific Request Codes */ 54 #define UAC_SET_ 0x00 55 #define UAC_GET_ 0x80 56 57 #define UAC__CUR 0x1 58 #define UAC__MIN 0x2 59 #define UAC__MAX 0x3 60 #define UAC__RES 0x4 61 #define UAC__MEM 0x5 62 63 #define UAC_SET_CUR (UAC_SET_ | UAC__CUR) 64 #define UAC_GET_CUR (UAC_GET_ | UAC__CUR) 65 #define UAC_SET_MIN (UAC_SET_ | UAC__MIN) 66 #define UAC_GET_MIN (UAC_GET_ | UAC__MIN) 67 #define UAC_SET_MAX (UAC_SET_ | UAC__MAX) 68 #define UAC_GET_MAX (UAC_GET_ | UAC__MAX) 69 #define UAC_SET_RES (UAC_SET_ | UAC__RES) 70 #define UAC_GET_RES (UAC_GET_ | UAC__RES) 71 #define UAC_SET_MEM (UAC_SET_ | UAC__MEM) 72 #define UAC_GET_MEM (UAC_GET_ | UAC__MEM) 73 74 #define UAC_GET_STAT 0xff 75 76 /* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */ 77 #define UAC_MS_HEADER 0x01 78 #define UAC_MIDI_IN_JACK 0x02 79 #define UAC_MIDI_OUT_JACK 0x03 80 81 /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */ 82 #define UAC_MS_GENERAL 0x01 83 84 /* Terminals - 2.1 USB Terminal Types */ 85 #define UAC_TERMINAL_UNDEFINED 0x100 86 #define UAC_TERMINAL_STREAMING 0x101 87 #define UAC_TERMINAL_VENDOR_SPEC 0x1FF 88 89 /* Terminal Control Selectors */ 90 /* 4.3.2 Class-Specific AC Interface Descriptor */ 91 struct uac_ac_header_descriptor_v1 { 92 __u8 bLength; /* 8 + n */ 93 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */ 94 __u8 bDescriptorSubtype; /* UAC_MS_HEADER */ 95 __le16 bcdADC; /* 0x0100 */ 96 __le16 wTotalLength; /* includes Unit and Terminal desc. */ 97 __u8 bInCollection; /* n */ 98 __u8 baInterfaceNr[]; /* [n] */ 99 } __attribute__ ((packed)); 100 101 #define UAC_DT_AC_HEADER_SIZE(n) (8 + (n)) 102 103 /* As above, but more useful for defining your own descriptors: */ 104 #define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n) \ 105 struct uac_ac_header_descriptor_v1_##n { \ 106 __u8 bLength; \ 107 __u8 bDescriptorType; \ 108 __u8 bDescriptorSubtype; \ 109 __le16 bcdADC; \ 110 __le16 wTotalLength; \ 111 __u8 bInCollection; \ 112 __u8 baInterfaceNr[n]; \ 113 } __attribute__ ((packed)) 114 115 /* 4.3.2.1 Input Terminal Descriptor */ 116 struct uac_input_terminal_descriptor { 117 __u8 bLength; /* in bytes: 12 */ 118 __u8 bDescriptorType; /* CS_INTERFACE descriptor type */ 119 __u8 bDescriptorSubtype; /* INPUT_TERMINAL descriptor subtype */ 120 __u8 bTerminalID; /* Constant uniquely terminal ID */ 121 __le16 wTerminalType; /* USB Audio Terminal Types */ 122 __u8 bAssocTerminal; /* ID of the Output Terminal associated */ 123 __u8 bNrChannels; /* Number of logical output channels */ 124 __le16 wChannelConfig; 125 __u8 iChannelNames; 126 __u8 iTerminal; 127 } __attribute__ ((packed)); 128 129 #define UAC_DT_INPUT_TERMINAL_SIZE 12 130 131 /* Terminals - 2.2 Input Terminal Types */ 132 #define UAC_INPUT_TERMINAL_UNDEFINED 0x200 133 #define UAC_INPUT_TERMINAL_MICROPHONE 0x201 134 #define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE 0x202 135 #define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE 0x203 136 #define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE 0x204 137 #define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY 0x205 138 #define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY 0x206 139 140 /* Terminals - control selectors */ 141 142 #define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL 0x01 143 144 /* 4.3.2.2 Output Terminal Descriptor */ 145 struct uac_output_terminal_descriptor_v1 { 146 __u8 bLength; /* in bytes: 9 */ 147 __u8 bDescriptorType; /* CS_INTERFACE descriptor type */ 148 __u8 bDescriptorSubtype; /* OUTPUT_TERMINAL descriptor subtype */ 149 __u8 bTerminalID; /* Constant uniquely terminal ID */ 150 __le16 wTerminalType; /* USB Audio Terminal Types */ 151 __u8 bAssocTerminal; /* ID of the Input Terminal associated */ 152 __u8 bSourceID; /* ID of the connected Unit or Terminal*/ 153 __u8 iTerminal; 154 } __attribute__ ((packed)); 155 156 #define UAC_DT_OUTPUT_TERMINAL_SIZE 9 157 158 /* Terminals - 2.3 Output Terminal Types */ 159 #define UAC_OUTPUT_TERMINAL_UNDEFINED 0x300 160 #define UAC_OUTPUT_TERMINAL_SPEAKER 0x301 161 #define UAC_OUTPUT_TERMINAL_HEADPHONES 0x302 162 #define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO 0x303 163 #define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER 0x304 164 #define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER 0x305 165 #define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER 0x306 166 #define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER 0x307 167 168 /* Set bControlSize = 2 as default setting */ 169 #define UAC_DT_FEATURE_UNIT_SIZE(ch) (7 + ((ch) + 1) * 2) 170 171 /* As above, but more useful for defining your own descriptors: */ 172 #define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch) \ 173 struct uac_feature_unit_descriptor_##ch { \ 174 __u8 bLength; \ 175 __u8 bDescriptorType; \ 176 __u8 bDescriptorSubtype; \ 177 __u8 bUnitID; \ 178 __u8 bSourceID; \ 179 __u8 bControlSize; \ 180 __le16 bmaControls[ch + 1]; \ 181 __u8 iFeature; \ 182 } __attribute__ ((packed)) 183 184 /* 4.3.2.3 Mixer Unit Descriptor */ 185 struct uac_mixer_unit_descriptor { 186 __u8 bLength; 187 __u8 bDescriptorType; 188 __u8 bDescriptorSubtype; 189 __u8 bUnitID; 190 __u8 bNrInPins; 191 __u8 baSourceID[]; 192 } __attribute__ ((packed)); 193 194 static inline __u8 uac_mixer_unit_bNrChannels(struct uac_mixer_unit_descriptor *desc) 195 { 196 return desc->baSourceID[desc->bNrInPins]; 197 } 198 199 static inline __u32 uac_mixer_unit_wChannelConfig(struct uac_mixer_unit_descriptor *desc, 200 int protocol) 201 { 202 if (protocol == UAC_VERSION_1) 203 return (desc->baSourceID[desc->bNrInPins + 2] << 8) | 204 desc->baSourceID[desc->bNrInPins + 1]; 205 else 206 return (desc->baSourceID[desc->bNrInPins + 4] << 24) | 207 (desc->baSourceID[desc->bNrInPins + 3] << 16) | 208 (desc->baSourceID[desc->bNrInPins + 2] << 8) | 209 (desc->baSourceID[desc->bNrInPins + 1]); 210 } 211 212 static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor *desc, 213 int protocol) 214 { 215 return (protocol == UAC_VERSION_1) ? 216 desc->baSourceID[desc->bNrInPins + 3] : 217 desc->baSourceID[desc->bNrInPins + 5]; 218 } 219 220 static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc, 221 int protocol) 222 { 223 return (protocol == UAC_VERSION_1) ? 224 &desc->baSourceID[desc->bNrInPins + 4] : 225 &desc->baSourceID[desc->bNrInPins + 6]; 226 } 227 228 static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc) 229 { 230 __u8 *raw = (__u8 *) desc; 231 return raw[desc->bLength - 1]; 232 } 233 234 /* 4.3.2.4 Selector Unit Descriptor */ 235 struct uac_selector_unit_descriptor { 236 __u8 bLength; 237 __u8 bDescriptorType; 238 __u8 bDescriptorSubtype; 239 __u8 bUintID; 240 __u8 bNrInPins; 241 __u8 baSourceID[]; 242 } __attribute__ ((packed)); 243 244 static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc) 245 { 246 __u8 *raw = (__u8 *) desc; 247 return raw[9 + desc->bLength - 1]; 248 } 249 250 /* 4.3.2.5 Feature Unit Descriptor */ 251 struct uac_feature_unit_descriptor { 252 __u8 bLength; 253 __u8 bDescriptorType; 254 __u8 bDescriptorSubtype; 255 __u8 bUnitID; 256 __u8 bSourceID; 257 __u8 bControlSize; 258 __u8 bmaControls[0]; /* variable length */ 259 } __attribute__((packed)); 260 261 static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc) 262 { 263 __u8 *raw = (__u8 *) desc; 264 return raw[desc->bLength - 1]; 265 } 266 267 /* 4.3.2.6 Processing Unit Descriptors */ 268 struct uac_processing_unit_descriptor { 269 __u8 bLength; 270 __u8 bDescriptorType; 271 __u8 bDescriptorSubtype; 272 __u8 bUnitID; 273 __u16 wProcessType; 274 __u8 bNrInPins; 275 __u8 baSourceID[]; 276 } __attribute__ ((packed)); 277 278 static inline __u8 uac_processing_unit_bNrChannels(struct uac_processing_unit_descriptor *desc) 279 { 280 return desc->baSourceID[desc->bNrInPins]; 281 } 282 283 static inline __u32 uac_processing_unit_wChannelConfig(struct uac_processing_unit_descriptor *desc, 284 int protocol) 285 { 286 if (protocol == UAC_VERSION_1) 287 return (desc->baSourceID[desc->bNrInPins + 2] << 8) | 288 desc->baSourceID[desc->bNrInPins + 1]; 289 else 290 return (desc->baSourceID[desc->bNrInPins + 4] << 24) | 291 (desc->baSourceID[desc->bNrInPins + 3] << 16) | 292 (desc->baSourceID[desc->bNrInPins + 2] << 8) | 293 (desc->baSourceID[desc->bNrInPins + 1]); 294 } 295 296 static inline __u8 uac_processing_unit_iChannelNames(struct uac_processing_unit_descriptor *desc, 297 int protocol) 298 { 299 return (protocol == UAC_VERSION_1) ? 300 desc->baSourceID[desc->bNrInPins + 3] : 301 desc->baSourceID[desc->bNrInPins + 5]; 302 } 303 304 static inline __u8 uac_processing_unit_bControlSize(struct uac_processing_unit_descriptor *desc, 305 int protocol) 306 { 307 return (protocol == UAC_VERSION_1) ? 308 desc->baSourceID[desc->bNrInPins + 4] : 309 desc->baSourceID[desc->bNrInPins + 6]; 310 } 311 312 static inline __u8 *uac_processing_unit_bmControls(struct uac_processing_unit_descriptor *desc, 313 int protocol) 314 { 315 return (protocol == UAC_VERSION_1) ? 316 &desc->baSourceID[desc->bNrInPins + 5] : 317 &desc->baSourceID[desc->bNrInPins + 7]; 318 } 319 320 static inline __u8 uac_processing_unit_iProcessing(struct uac_processing_unit_descriptor *desc, 321 int protocol) 322 { 323 __u8 control_size = uac_processing_unit_bControlSize(desc, protocol); 324 return desc->baSourceID[desc->bNrInPins + control_size]; 325 } 326 327 static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_descriptor *desc, 328 int protocol) 329 { 330 __u8 control_size = uac_processing_unit_bControlSize(desc, protocol); 331 return &desc->baSourceID[desc->bNrInPins + control_size + 1]; 332 } 333 334 /* 4.5.2 Class-Specific AS Interface Descriptor */ 335 struct uac_as_header_descriptor_v1 { 336 __u8 bLength; /* in bytes: 7 */ 337 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */ 338 __u8 bDescriptorSubtype; /* AS_GENERAL */ 339 __u8 bTerminalLink; /* Terminal ID of connected Terminal */ 340 __u8 bDelay; /* Delay introduced by the data path */ 341 __le16 wFormatTag; /* The Audio Data Format */ 342 } __attribute__ ((packed)); 343 344 #define UAC_DT_AS_HEADER_SIZE 7 345 346 /* Formats - A.1.1 Audio Data Format Type I Codes */ 347 #define UAC_FORMAT_TYPE_I_UNDEFINED 0x0 348 #define UAC_FORMAT_TYPE_I_PCM 0x1 349 #define UAC_FORMAT_TYPE_I_PCM8 0x2 350 #define UAC_FORMAT_TYPE_I_IEEE_FLOAT 0x3 351 #define UAC_FORMAT_TYPE_I_ALAW 0x4 352 #define UAC_FORMAT_TYPE_I_MULAW 0x5 353 354 struct uac_format_type_i_continuous_descriptor { 355 __u8 bLength; /* in bytes: 8 + (ns * 3) */ 356 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */ 357 __u8 bDescriptorSubtype; /* FORMAT_TYPE */ 358 __u8 bFormatType; /* FORMAT_TYPE_1 */ 359 __u8 bNrChannels; /* physical channels in the stream */ 360 __u8 bSubframeSize; /* */ 361 __u8 bBitResolution; 362 __u8 bSamFreqType; 363 __u8 tLowerSamFreq[3]; 364 __u8 tUpperSamFreq[3]; 365 } __attribute__ ((packed)); 366 367 #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE 14 368 369 struct uac_format_type_i_discrete_descriptor { 370 __u8 bLength; /* in bytes: 8 + (ns * 3) */ 371 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */ 372 __u8 bDescriptorSubtype; /* FORMAT_TYPE */ 373 __u8 bFormatType; /* FORMAT_TYPE_1 */ 374 __u8 bNrChannels; /* physical channels in the stream */ 375 __u8 bSubframeSize; /* */ 376 __u8 bBitResolution; 377 __u8 bSamFreqType; 378 __u8 tSamFreq[][3]; 379 } __attribute__ ((packed)); 380 381 #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n) \ 382 struct uac_format_type_i_discrete_descriptor_##n { \ 383 __u8 bLength; \ 384 __u8 bDescriptorType; \ 385 __u8 bDescriptorSubtype; \ 386 __u8 bFormatType; \ 387 __u8 bNrChannels; \ 388 __u8 bSubframeSize; \ 389 __u8 bBitResolution; \ 390 __u8 bSamFreqType; \ 391 __u8 tSamFreq[n][3]; \ 392 } __attribute__ ((packed)) 393 394 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3)) 395 396 struct uac_format_type_i_ext_descriptor { 397 __u8 bLength; 398 __u8 bDescriptorType; 399 __u8 bDescriptorSubtype; 400 __u8 bFormatType; 401 __u8 bSubslotSize; 402 __u8 bBitResolution; 403 __u8 bHeaderLength; 404 __u8 bControlSize; 405 __u8 bSideBandProtocol; 406 } __attribute__((packed)); 407 408 /* Formats - Audio Data Format Type I Codes */ 409 410 #define UAC_FORMAT_TYPE_II_MPEG 0x1001 411 #define UAC_FORMAT_TYPE_II_AC3 0x1002 412 413 struct uac_format_type_ii_discrete_descriptor { 414 __u8 bLength; 415 __u8 bDescriptorType; 416 __u8 bDescriptorSubtype; 417 __u8 bFormatType; 418 __le16 wMaxBitRate; 419 __le16 wSamplesPerFrame; 420 __u8 bSamFreqType; 421 __u8 tSamFreq[][3]; 422 } __attribute__((packed)); 423 424 struct uac_format_type_ii_ext_descriptor { 425 __u8 bLength; 426 __u8 bDescriptorType; 427 __u8 bDescriptorSubtype; 428 __u8 bFormatType; 429 __u16 wMaxBitRate; 430 __u16 wSamplesPerFrame; 431 __u8 bHeaderLength; 432 __u8 bSideBandProtocol; 433 } __attribute__((packed)); 434 435 /* type III */ 436 #define UAC_FORMAT_TYPE_III_IEC1937_AC3 0x2001 437 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG1_LAYER1 0x2002 438 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_NOEXT 0x2003 439 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_EXT 0x2004 440 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER1_LS 0x2005 441 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER23_LS 0x2006 442 443 /* Formats - A.2 Format Type Codes */ 444 #define UAC_FORMAT_TYPE_UNDEFINED 0x0 445 #define UAC_FORMAT_TYPE_I 0x1 446 #define UAC_FORMAT_TYPE_II 0x2 447 #define UAC_FORMAT_TYPE_III 0x3 448 #define UAC_EXT_FORMAT_TYPE_I 0x81 449 #define UAC_EXT_FORMAT_TYPE_II 0x82 450 #define UAC_EXT_FORMAT_TYPE_III 0x83 451 452 struct uac_iso_endpoint_descriptor { 453 __u8 bLength; /* in bytes: 7 */ 454 __u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */ 455 __u8 bDescriptorSubtype; /* EP_GENERAL */ 456 __u8 bmAttributes; 457 __u8 bLockDelayUnits; 458 __le16 wLockDelay; 459 } __attribute__((packed)); 460 #define UAC_ISO_ENDPOINT_DESC_SIZE 7 461 462 #define UAC_EP_CS_ATTR_SAMPLE_RATE 0x01 463 #define UAC_EP_CS_ATTR_PITCH_CONTROL 0x02 464 #define UAC_EP_CS_ATTR_FILL_MAX 0x80 465 466 /* A.10.2 Feature Unit Control Selectors */ 467 468 #define UAC_FU_CONTROL_UNDEFINED 0x00 469 #define UAC_MUTE_CONTROL 0x01 470 #define UAC_VOLUME_CONTROL 0x02 471 #define UAC_BASS_CONTROL 0x03 472 #define UAC_MID_CONTROL 0x04 473 #define UAC_TREBLE_CONTROL 0x05 474 #define UAC_GRAPHIC_EQUALIZER_CONTROL 0x06 475 #define UAC_AUTOMATIC_GAIN_CONTROL 0x07 476 #define UAC_DELAY_CONTROL 0x08 477 #define UAC_BASS_BOOST_CONTROL 0x09 478 #define UAC_LOUDNESS_CONTROL 0x0a 479 480 #define UAC_FU_MUTE (1 << (UAC_MUTE_CONTROL - 1)) 481 #define UAC_FU_VOLUME (1 << (UAC_VOLUME_CONTROL - 1)) 482 #define UAC_FU_BASS (1 << (UAC_BASS_CONTROL - 1)) 483 #define UAC_FU_MID (1 << (UAC_MID_CONTROL - 1)) 484 #define UAC_FU_TREBLE (1 << (UAC_TREBLE_CONTROL - 1)) 485 #define UAC_FU_GRAPHIC_EQ (1 << (UAC_GRAPHIC_EQUALIZER_CONTROL - 1)) 486 #define UAC_FU_AUTO_GAIN (1 << (UAC_AUTOMATIC_GAIN_CONTROL - 1)) 487 #define UAC_FU_DELAY (1 << (UAC_DELAY_CONTROL - 1)) 488 #define UAC_FU_BASS_BOOST (1 << (UAC_BASS_BOOST_CONTROL - 1)) 489 #define UAC_FU_LOUDNESS (1 << (UAC_LOUDNESS_CONTROL - 1)) 490 491 /* status word format (3.7.1.1) */ 492 493 #define UAC1_STATUS_TYPE_ORIG_MASK 0x0f 494 #define UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF 0x0 495 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_IF 0x1 496 #define UAC1_STATUS_TYPE_ORIG_AUDIO_STREAM_EP 0x2 497 498 #define UAC1_STATUS_TYPE_IRQ_PENDING (1 << 7) 499 #define UAC1_STATUS_TYPE_MEM_CHANGED (1 << 6) 500 501 struct uac1_status_word { 502 __u8 bStatusType; 503 __u8 bOriginator; 504 } __attribute__((packed)); 505 506 #ifdef __KERNEL__ 507 508 struct usb_audio_control { 509 struct list_head list; 510 const char *name; 511 u8 type; 512 int data[5]; 513 int (*set)(struct usb_audio_control *con, u8 cmd, int value); 514 int (*get)(struct usb_audio_control *con, u8 cmd); 515 }; 516 517 struct usb_audio_control_selector { 518 struct list_head list; 519 struct list_head control; 520 u8 id; 521 const char *name; 522 u8 type; 523 struct usb_descriptor_header *desc; 524 }; 525 526 #endif /* __KERNEL__ */ 527 528 #endif /* __LINUX_USB_AUDIO_H */ 529