2 * <linux/usb/audio.h> -- USB Audio definitions.
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
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.
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:
15 * http://www.usb.org/developers/devclass_docs/audio10.pdf
17 * Types and defines in this file are either specific to version 1.0 of
18 * this standard or common for newer versions.
21 #ifndef __LINUX_USB_AUDIO_H
22 #define __LINUX_USB_AUDIO_H
24 #include <linux/types.h>
26 /* bInterfaceProtocol values to denote the version of the standard used */
27 #define UAC_VERSION_1 0x00
28 #define UAC_VERSION_2 0x20
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
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
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
50 /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
51 #define UAC_EP_GENERAL 0x01
53 /* A.9 Audio Class-Specific Request Codes */
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)
74 #define UAC_GET_STAT 0xff
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
81 /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
82 #define UAC_MS_GENERAL 0x01
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
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));
101 #define UAC_DT_AC_HEADER_SIZE(n) (8 + (n))
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 { \
107 __u8 bDescriptorType; \
108 __u8 bDescriptorSubtype; \
110 __le16 wTotalLength; \
111 __u8 bInCollection; \
112 __u8 baInterfaceNr[n]; \
113 } __attribute__ ((packed))
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;
127 } __attribute__ ((packed));
129 #define UAC_DT_INPUT_TERMINAL_SIZE 12
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
140 /* Terminals - control selectors */
142 #define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL 0x01
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*/
154 } __attribute__ ((packed));
156 #define UAC_DT_OUTPUT_TERMINAL_SIZE 9
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
168 /* Set bControlSize = 2 as default setting */
169 #define UAC_DT_FEATURE_UNIT_SIZE(ch) (7 + ((ch) + 1) * 2)
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 { \
175 __u8 bDescriptorType; \
176 __u8 bDescriptorSubtype; \
180 __le16 bmaControls[ch + 1]; \
182 } __attribute__ ((packed))
184 /* 4.3.2.3 Mixer Unit Descriptor */
185 struct uac_mixer_unit_descriptor {
187 __u8 bDescriptorType;
188 __u8 bDescriptorSubtype;
192 } __attribute__ ((packed));
194 static inline __u8 uac_mixer_unit_bNrChannels(struct uac_mixer_unit_descriptor *desc)
196 return desc->baSourceID[desc->bNrInPins];
199 static inline __u16 uac_mixer_unit_wChannelConfig(struct uac_mixer_unit_descriptor *desc)
201 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
202 desc->baSourceID[desc->bNrInPins + 1];
205 static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor *desc)
207 return desc->baSourceID[desc->bNrInPins + 3];
210 static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc)
212 return &desc->baSourceID[desc->bNrInPins + 4];
215 static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc)
217 __u8 *raw = (__u8 *) desc;
218 return raw[desc->bLength - 1];
221 /* 4.3.2.4 Selector Unit Descriptor */
222 struct uac_selector_unit_descriptor {
224 __u8 bDescriptorType;
225 __u8 bDescriptorSubtype;
229 } __attribute__ ((packed));
231 static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc)
233 __u8 *raw = (__u8 *) desc;
234 return raw[desc->bLength - 1];
237 /* 4.3.2.5 Feature Unit Descriptor */
238 struct uac_feature_unit_descriptor {
240 __u8 bDescriptorType;
241 __u8 bDescriptorSubtype;
245 __u8 bmaControls[0]; /* variable length */
246 } __attribute__((packed));
248 static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc)
250 __u8 *raw = (__u8 *) desc;
251 return raw[desc->bLength - 1];
254 /* 4.3.2.6 Processing Unit Descriptors */
255 struct uac_processing_unit_descriptor {
257 __u8 bDescriptorType;
258 __u8 bDescriptorSubtype;
263 } __attribute__ ((packed));
265 static inline __u8 uac_processing_unit_bNrChannels(struct uac_processing_unit_descriptor *desc)
267 return desc->baSourceID[desc->bNrInPins];
270 static inline __u16 uac_processing_unit_wChannelConfig(struct uac_processing_unit_descriptor *desc)
272 return (desc->baSourceID[desc->bNrInPins + 2] << 8) |
273 desc->baSourceID[desc->bNrInPins + 1];
276 static inline __u8 uac_processing_unit_iChannelNames(struct uac_processing_unit_descriptor *desc)
278 return desc->baSourceID[desc->bNrInPins + 3];
281 static inline __u8 uac_processing_unit_bControlSize(struct uac_processing_unit_descriptor *desc)
283 return desc->baSourceID[desc->bNrInPins + 4];
286 static inline __u8 *uac_processing_unit_bmControls(struct uac_processing_unit_descriptor *desc)
288 return &desc->baSourceID[desc->bNrInPins + 5];
291 static inline __u8 uac_processing_unit_iProcessing(struct uac_processing_unit_descriptor *desc)
293 __u8 control_size = uac_processing_unit_bControlSize(desc);
294 return desc->baSourceID[desc->bNrInPins + control_size];
297 static inline __u8 *uac_processing_unit_specific(struct uac_processing_unit_descriptor *desc)
299 __u8 control_size = uac_processing_unit_bControlSize(desc);
300 return &desc->baSourceID[desc->bNrInPins + control_size + 1];
303 /* 4.5.2 Class-Specific AS Interface Descriptor */
304 struct uac_as_header_descriptor_v1 {
305 __u8 bLength; /* in bytes: 7 */
306 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
307 __u8 bDescriptorSubtype; /* AS_GENERAL */
308 __u8 bTerminalLink; /* Terminal ID of connected Terminal */
309 __u8 bDelay; /* Delay introduced by the data path */
310 __le16 wFormatTag; /* The Audio Data Format */
311 } __attribute__ ((packed));
313 #define UAC_DT_AS_HEADER_SIZE 7
315 /* Formats - A.1.1 Audio Data Format Type I Codes */
316 #define UAC_FORMAT_TYPE_I_UNDEFINED 0x0
317 #define UAC_FORMAT_TYPE_I_PCM 0x1
318 #define UAC_FORMAT_TYPE_I_PCM8 0x2
319 #define UAC_FORMAT_TYPE_I_IEEE_FLOAT 0x3
320 #define UAC_FORMAT_TYPE_I_ALAW 0x4
321 #define UAC_FORMAT_TYPE_I_MULAW 0x5
323 struct uac_format_type_i_continuous_descriptor {
324 __u8 bLength; /* in bytes: 8 + (ns * 3) */
325 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
326 __u8 bDescriptorSubtype; /* FORMAT_TYPE */
327 __u8 bFormatType; /* FORMAT_TYPE_1 */
328 __u8 bNrChannels; /* physical channels in the stream */
329 __u8 bSubframeSize; /* */
332 __u8 tLowerSamFreq[3];
333 __u8 tUpperSamFreq[3];
334 } __attribute__ ((packed));
336 #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE 14
338 struct uac_format_type_i_discrete_descriptor {
339 __u8 bLength; /* in bytes: 8 + (ns * 3) */
340 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
341 __u8 bDescriptorSubtype; /* FORMAT_TYPE */
342 __u8 bFormatType; /* FORMAT_TYPE_1 */
343 __u8 bNrChannels; /* physical channels in the stream */
344 __u8 bSubframeSize; /* */
348 } __attribute__ ((packed));
350 #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n) \
351 struct uac_format_type_i_discrete_descriptor_##n { \
353 __u8 bDescriptorType; \
354 __u8 bDescriptorSubtype; \
357 __u8 bSubframeSize; \
358 __u8 bBitResolution; \
360 __u8 tSamFreq[n][3]; \
361 } __attribute__ ((packed))
363 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))
365 struct uac_format_type_i_ext_descriptor {
367 __u8 bDescriptorType;
368 __u8 bDescriptorSubtype;
374 __u8 bSideBandProtocol;
375 } __attribute__((packed));
377 /* Formats - Audio Data Format Type I Codes */
379 #define UAC_FORMAT_TYPE_II_MPEG 0x1001
380 #define UAC_FORMAT_TYPE_II_AC3 0x1002
382 struct uac_format_type_ii_discrete_descriptor {
384 __u8 bDescriptorType;
385 __u8 bDescriptorSubtype;
388 __le16 wSamplesPerFrame;
391 } __attribute__((packed));
393 struct uac_format_type_ii_ext_descriptor {
395 __u8 bDescriptorType;
396 __u8 bDescriptorSubtype;
399 __u16 wSamplesPerFrame;
401 __u8 bSideBandProtocol;
402 } __attribute__((packed));
405 #define UAC_FORMAT_TYPE_III_IEC1937_AC3 0x2001
406 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG1_LAYER1 0x2002
407 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_NOEXT 0x2003
408 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_EXT 0x2004
409 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER1_LS 0x2005
410 #define UAC_FORMAT_TYPE_III_IEC1937_MPEG2_LAYER23_LS 0x2006
412 /* Formats - A.2 Format Type Codes */
413 #define UAC_FORMAT_TYPE_UNDEFINED 0x0
414 #define UAC_FORMAT_TYPE_I 0x1
415 #define UAC_FORMAT_TYPE_II 0x2
416 #define UAC_FORMAT_TYPE_III 0x3
417 #define UAC_EXT_FORMAT_TYPE_I 0x81
418 #define UAC_EXT_FORMAT_TYPE_II 0x82
419 #define UAC_EXT_FORMAT_TYPE_III 0x83
421 struct uac_iso_endpoint_descriptor {
422 __u8 bLength; /* in bytes: 7 */
423 __u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */
424 __u8 bDescriptorSubtype; /* EP_GENERAL */
426 __u8 bLockDelayUnits;
429 #define UAC_ISO_ENDPOINT_DESC_SIZE 7
431 #define UAC_EP_CS_ATTR_SAMPLE_RATE 0x01
432 #define UAC_EP_CS_ATTR_PITCH_CONTROL 0x02
433 #define UAC_EP_CS_ATTR_FILL_MAX 0x80
435 /* A.10.2 Feature Unit Control Selectors */
437 #define UAC_FU_CONTROL_UNDEFINED 0x00
438 #define UAC_MUTE_CONTROL 0x01
439 #define UAC_VOLUME_CONTROL 0x02
440 #define UAC_BASS_CONTROL 0x03
441 #define UAC_MID_CONTROL 0x04
442 #define UAC_TREBLE_CONTROL 0x05
443 #define UAC_GRAPHIC_EQUALIZER_CONTROL 0x06
444 #define UAC_AUTOMATIC_GAIN_CONTROL 0x07
445 #define UAC_DELAY_CONTROL 0x08
446 #define UAC_BASS_BOOST_CONTROL 0x09
447 #define UAC_LOUDNESS_CONTROL 0x0a
449 #define UAC_FU_MUTE (1 << (UAC_MUTE_CONTROL - 1))
450 #define UAC_FU_VOLUME (1 << (UAC_VOLUME_CONTROL - 1))
451 #define UAC_FU_BASS (1 << (UAC_BASS_CONTROL - 1))
452 #define UAC_FU_MID (1 << (UAC_MID_CONTROL - 1))
453 #define UAC_FU_TREBLE (1 << (UAC_TREBLE_CONTROL - 1))
454 #define UAC_FU_GRAPHIC_EQ (1 << (UAC_GRAPHIC_EQUALIZER_CONTROL - 1))
455 #define UAC_FU_AUTO_GAIN (1 << (UAC_AUTOMATIC_GAIN_CONTROL - 1))
456 #define UAC_FU_DELAY (1 << (UAC_DELAY_CONTROL - 1))
457 #define UAC_FU_BASS_BOOST (1 << (UAC_BASS_BOOST_CONTROL - 1))
458 #define UAC_FU_LOUDNESS (1 << (UAC_LOUDNESS_CONTROL - 1))
462 struct usb_audio_control {
463 struct list_head list;
467 int (*set)(struct usb_audio_control *con, u8 cmd, int value);
468 int (*get)(struct usb_audio_control *con, u8 cmd);
471 struct usb_audio_control_selector {
472 struct list_head list;
473 struct list_head control;
477 struct usb_descriptor_header *desc;
480 #endif /* __KERNEL__ */
482 #endif /* __LINUX_USB_AUDIO_H */