xref: /linux-6.15/include/linux/usb/audio.h (revision b95cd7ec)
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 
18 #ifndef __LINUX_USB_AUDIO_H
19 #define __LINUX_USB_AUDIO_H
20 
21 #include <linux/types.h>
22 
23 /* A.2 Audio Interface Subclass Codes */
24 #define USB_SUBCLASS_AUDIOCONTROL	0x01
25 #define USB_SUBCLASS_AUDIOSTREAMING	0x02
26 #define USB_SUBCLASS_MIDISTREAMING	0x03
27 
28 /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
29 #define UAC_HEADER			0x01
30 #define UAC_INPUT_TERMINAL		0x02
31 #define UAC_OUTPUT_TERMINAL		0x03
32 #define UAC_MIXER_UNIT			0x04
33 #define UAC_SELECTOR_UNIT		0x05
34 #define UAC_FEATURE_UNIT		0x06
35 #define UAC_PROCESSING_UNIT		0x07
36 #define UAC_EXTENSION_UNIT		0x08
37 
38 /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
39 #define UAC_AS_GENERAL			0x01
40 #define UAC_FORMAT_TYPE			0x02
41 #define UAC_FORMAT_SPECIFIC		0x03
42 
43 /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
44 #define UAC_EP_GENERAL			0x01
45 
46 /* A.9 Audio Class-Specific Request Codes */
47 #define UAC_SET_			0x00
48 #define UAC_GET_			0x80
49 
50 #define UAC__CUR			0x1
51 #define UAC__MIN			0x2
52 #define UAC__MAX			0x3
53 #define UAC__RES			0x4
54 #define UAC__MEM			0x5
55 
56 #define UAC_SET_CUR			(UAC_SET_ | UAC__CUR)
57 #define UAC_GET_CUR			(UAC_GET_ | UAC__CUR)
58 #define UAC_SET_MIN			(UAC_SET_ | UAC__MIN)
59 #define UAC_GET_MIN			(UAC_GET_ | UAC__MIN)
60 #define UAC_SET_MAX			(UAC_SET_ | UAC__MAX)
61 #define UAC_GET_MAX			(UAC_GET_ | UAC__MAX)
62 #define UAC_SET_RES			(UAC_SET_ | UAC__RES)
63 #define UAC_GET_RES			(UAC_GET_ | UAC__RES)
64 #define UAC_SET_MEM			(UAC_SET_ | UAC__MEM)
65 #define UAC_GET_MEM			(UAC_GET_ | UAC__MEM)
66 
67 #define UAC_GET_STAT			0xff
68 
69 /* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */
70 #define UAC_MS_HEADER			0x01
71 #define UAC_MIDI_IN_JACK		0x02
72 #define UAC_MIDI_OUT_JACK		0x03
73 
74 /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
75 #define UAC_MS_GENERAL			0x01
76 
77 /* Terminals - 2.1 USB Terminal Types */
78 #define UAC_TERMINAL_UNDEFINED		0x100
79 #define UAC_TERMINAL_STREAMING		0x101
80 #define UAC_TERMINAL_VENDOR_SPEC	0x1FF
81 
82 /* Terminal Control Selectors */
83 /* 4.3.2  Class-Specific AC Interface Descriptor */
84 struct uac_ac_header_descriptor {
85 	__u8  bLength;			/* 8 + n */
86 	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */
87 	__u8  bDescriptorSubtype;	/* UAC_MS_HEADER */
88 	__le16 bcdADC;			/* 0x0100 */
89 	__le16 wTotalLength;		/* includes Unit and Terminal desc. */
90 	__u8  bInCollection;		/* n */
91 	__u8  baInterfaceNr[];		/* [n] */
92 } __attribute__ ((packed));
93 
94 #define UAC_DT_AC_HEADER_SIZE(n)	(8 + (n))
95 
96 /* As above, but more useful for defining your own descriptors: */
97 #define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n) 			\
98 struct uac_ac_header_descriptor_##n {				\
99 	__u8  bLength;						\
100 	__u8  bDescriptorType;					\
101 	__u8  bDescriptorSubtype;				\
102 	__le16 bcdADC;						\
103 	__le16 wTotalLength;					\
104 	__u8  bInCollection;					\
105 	__u8  baInterfaceNr[n];					\
106 } __attribute__ ((packed))
107 
108 /* 4.3.2.1 Input Terminal Descriptor */
109 struct uac_input_terminal_descriptor {
110 	__u8  bLength;			/* in bytes: 12 */
111 	__u8  bDescriptorType;		/* CS_INTERFACE descriptor type */
112 	__u8  bDescriptorSubtype;	/* INPUT_TERMINAL descriptor subtype */
113 	__u8  bTerminalID;		/* Constant uniquely terminal ID */
114 	__le16 wTerminalType;		/* USB Audio Terminal Types */
115 	__u8  bAssocTerminal;		/* ID of the Output Terminal associated */
116 	__u8  bNrChannels;		/* Number of logical output channels */
117 	__le16 wChannelConfig;
118 	__u8  iChannelNames;
119 	__u8  iTerminal;
120 } __attribute__ ((packed));
121 
122 #define UAC_DT_INPUT_TERMINAL_SIZE			12
123 
124 /* Terminals - 2.2 Input Terminal Types */
125 #define UAC_INPUT_TERMINAL_UNDEFINED			0x200
126 #define UAC_INPUT_TERMINAL_MICROPHONE			0x201
127 #define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE		0x202
128 #define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE		0x203
129 #define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE		0x204
130 #define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY		0x205
131 #define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY	0x206
132 
133 /* 4.3.2.2 Output Terminal Descriptor */
134 struct uac_output_terminal_descriptor {
135 	__u8  bLength;			/* in bytes: 9 */
136 	__u8  bDescriptorType;		/* CS_INTERFACE descriptor type */
137 	__u8  bDescriptorSubtype;	/* OUTPUT_TERMINAL descriptor subtype */
138 	__u8  bTerminalID;		/* Constant uniquely terminal ID */
139 	__le16 wTerminalType;		/* USB Audio Terminal Types */
140 	__u8  bAssocTerminal;		/* ID of the Input Terminal associated */
141 	__u8  bSourceID;		/* ID of the connected Unit or Terminal*/
142 	__u8  iTerminal;
143 } __attribute__ ((packed));
144 
145 #define UAC_DT_OUTPUT_TERMINAL_SIZE			9
146 
147 /* Terminals - 2.3 Output Terminal Types */
148 #define UAC_OUTPUT_TERMINAL_UNDEFINED			0x300
149 #define UAC_OUTPUT_TERMINAL_SPEAKER			0x301
150 #define UAC_OUTPUT_TERMINAL_HEADPHONES			0x302
151 #define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO	0x303
152 #define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER		0x304
153 #define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER		0x305
154 #define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER	0x306
155 #define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER	0x307
156 
157 /* Set bControlSize = 2 as default setting */
158 #define UAC_DT_FEATURE_UNIT_SIZE(ch)		(7 + ((ch) + 1) * 2)
159 
160 /* As above, but more useful for defining your own descriptors: */
161 #define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch) 		\
162 struct uac_feature_unit_descriptor_##ch {			\
163 	__u8  bLength;						\
164 	__u8  bDescriptorType;					\
165 	__u8  bDescriptorSubtype;				\
166 	__u8  bUnitID;						\
167 	__u8  bSourceID;					\
168 	__u8  bControlSize;					\
169 	__le16 bmaControls[ch + 1];				\
170 	__u8  iFeature;						\
171 } __attribute__ ((packed))
172 
173 /* 4.5.2 Class-Specific AS Interface Descriptor */
174 struct uac_as_header_descriptor {
175 	__u8  bLength;			/* in bytes: 7 */
176 	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */
177 	__u8  bDescriptorSubtype;	/* AS_GENERAL */
178 	__u8  bTerminalLink;		/* Terminal ID of connected Terminal */
179 	__u8  bDelay;			/* Delay introduced by the data path */
180 	__le16 wFormatTag;		/* The Audio Data Format */
181 } __attribute__ ((packed));
182 
183 #define UAC_DT_AS_HEADER_SIZE		7
184 
185 /* Formats - A.1.1 Audio Data Format Type I Codes */
186 #define UAC_FORMAT_TYPE_I_UNDEFINED	0x0
187 #define UAC_FORMAT_TYPE_I_PCM		0x1
188 #define UAC_FORMAT_TYPE_I_PCM8		0x2
189 #define UAC_FORMAT_TYPE_I_IEEE_FLOAT	0x3
190 #define UAC_FORMAT_TYPE_I_ALAW		0x4
191 #define UAC_FORMAT_TYPE_I_MULAW		0x5
192 
193 struct uac_format_type_i_continuous_descriptor {
194 	__u8  bLength;			/* in bytes: 8 + (ns * 3) */
195 	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */
196 	__u8  bDescriptorSubtype;	/* FORMAT_TYPE */
197 	__u8  bFormatType;		/* FORMAT_TYPE_1 */
198 	__u8  bNrChannels;		/* physical channels in the stream */
199 	__u8  bSubframeSize;		/* */
200 	__u8  bBitResolution;
201 	__u8  bSamFreqType;
202 	__u8  tLowerSamFreq[3];
203 	__u8  tUpperSamFreq[3];
204 } __attribute__ ((packed));
205 
206 #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE	14
207 
208 struct uac_format_type_i_discrete_descriptor {
209 	__u8  bLength;			/* in bytes: 8 + (ns * 3) */
210 	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */
211 	__u8  bDescriptorSubtype;	/* FORMAT_TYPE */
212 	__u8  bFormatType;		/* FORMAT_TYPE_1 */
213 	__u8  bNrChannels;		/* physical channels in the stream */
214 	__u8  bSubframeSize;		/* */
215 	__u8  bBitResolution;
216 	__u8  bSamFreqType;
217 	__u8  tSamFreq[][3];
218 } __attribute__ ((packed));
219 
220 #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n) 		\
221 struct uac_format_type_i_discrete_descriptor_##n {		\
222 	__u8  bLength;						\
223 	__u8  bDescriptorType;					\
224 	__u8  bDescriptorSubtype;				\
225 	__u8  bFormatType;					\
226 	__u8  bNrChannels;					\
227 	__u8  bSubframeSize;					\
228 	__u8  bBitResolution;					\
229 	__u8  bSamFreqType;					\
230 	__u8  tSamFreq[n][3];					\
231 } __attribute__ ((packed))
232 
233 #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n)	(8 + (n * 3))
234 
235 /* Formats - A.2 Format Type Codes */
236 #define UAC_FORMAT_TYPE_UNDEFINED	0x0
237 #define UAC_FORMAT_TYPE_I		0x1
238 #define UAC_FORMAT_TYPE_II		0x2
239 #define UAC_FORMAT_TYPE_III		0x3
240 
241 struct uac_iso_endpoint_descriptor {
242 	__u8  bLength;			/* in bytes: 7 */
243 	__u8  bDescriptorType;		/* USB_DT_CS_ENDPOINT */
244 	__u8  bDescriptorSubtype;	/* EP_GENERAL */
245 	__u8  bmAttributes;
246 	__u8  bLockDelayUnits;
247 	__le16 wLockDelay;
248 };
249 #define UAC_ISO_ENDPOINT_DESC_SIZE	7
250 
251 #define UAC_EP_CS_ATTR_SAMPLE_RATE	0x01
252 #define UAC_EP_CS_ATTR_PITCH_CONTROL	0x02
253 #define UAC_EP_CS_ATTR_FILL_MAX		0x80
254 
255 /* A.10.2 Feature Unit Control Selectors */
256 #define UAC_FU_CONTROL_UNDEFINED	0x00
257 #define UAC_MUTE_CONTROL		0x01
258 #define UAC_VOLUME_CONTROL		0x02
259 #define UAC_BASS_CONTROL		0x03
260 #define UAC_MID_CONTROL			0x04
261 #define UAC_TREBLE_CONTROL		0x05
262 #define UAC_GRAPHIC_EQUALIZER_CONTROL	0x06
263 #define UAC_AUTOMATIC_GAIN_CONTROL	0x07
264 #define UAC_DELAY_CONTROL		0x08
265 #define UAC_BASS_BOOST_CONTROL		0x09
266 #define UAC_LOUDNESS_CONTROL		0x0a
267 
268 #define UAC_FU_MUTE		(1 << (UAC_MUTE_CONTROL - 1))
269 #define UAC_FU_VOLUME		(1 << (UAC_VOLUME_CONTROL - 1))
270 #define UAC_FU_BASS		(1 << (UAC_BASS_CONTROL - 1))
271 #define UAC_FU_MID		(1 << (UAC_MID_CONTROL - 1))
272 #define UAC_FU_TREBLE		(1 << (UAC_TREBLE_CONTROL - 1))
273 #define UAC_FU_GRAPHIC_EQ	(1 << (UAC_GRAPHIC_EQUALIZER_CONTROL - 1))
274 #define UAC_FU_AUTO_GAIN	(1 << (UAC_AUTOMATIC_GAIN_CONTROL - 1))
275 #define UAC_FU_DELAY		(1 << (UAC_DELAY_CONTROL - 1))
276 #define UAC_FU_BASS_BOOST	(1 << (UAC_BASS_BOOST_CONTROL - 1))
277 #define UAC_FU_LOUDNESS		(1 << (UAC_LOUDNESS_CONTROL - 1))
278 
279 struct usb_audio_control {
280 	struct list_head list;
281 	const char *name;
282 	u8 type;
283 	int data[5];
284 	int (*set)(struct usb_audio_control *con, u8 cmd, int value);
285 	int (*get)(struct usb_audio_control *con, u8 cmd);
286 };
287 
288 struct usb_audio_control_selector {
289 	struct list_head list;
290 	struct list_head control;
291 	u8 id;
292 	const char *name;
293 	u8 type;
294 	struct usb_descriptor_header *desc;
295 };
296 
297 #endif /* __LINUX_USB_AUDIO_H */
298