include/linux/usb/audio.h - linux-mtk - Git at Google


            
            /*

            
             * <linux/usb/audio.h> -- USB Audio definitions.

            
             *

            
             * Copyright (C) 2006 Thumtronics Pty Ltd.

            
             * Developed for Thumtronics by Grey Innovation

            
             * Ben Williamson <ben.williamson@greyinnovation.com>

            
             *

            
             * This software is distributed under the terms of the GNU General Public

            
             * License ("GPL") version 2, as published by the Free Software Foundation.

            
             *

            
             * This file holds USB constants and structures defined

            
             * by the USB Device Class Definition for Audio Devices.

            
             * Comments below reference relevant sections of that document:

            
             *

            
             * http://www.usb.org/developers/devclass_docs/audio10.pdf

            
             */


            #ifndef __LINUX_USB_AUDIO_H

            
            #define __LINUX_USB_AUDIO_H


            #include <linux/types.h>


            /* A.2 Audio Interface Subclass Codes */

            
            #define USB_SUBCLASS_AUDIOCONTROL	0x01

            
            #define USB_SUBCLASS_AUDIOSTREAMING	0x02

            
            #define USB_SUBCLASS_MIDISTREAMING	0x03


            /* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */

            
            #define UAC_HEADER			0x01

            
            #define UAC_INPUT_TERMINAL		0x02

            
            #define UAC_OUTPUT_TERMINAL		0x03

            
            #define UAC_MIXER_UNIT			0x04

            
            #define UAC_SELECTOR_UNIT		0x05

            
            #define UAC_FEATURE_UNIT		0x06

            
            #define UAC_PROCESSING_UNIT		0x07

            
            #define UAC_EXTENSION_UNIT		0x08


            /* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */

            
            #define UAC_AS_GENERAL			0x01

            
            #define UAC_FORMAT_TYPE			0x02

            
            #define UAC_FORMAT_SPECIFIC		0x03


            /* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */

            
            #define UAC_EP_GENERAL			0x01


            /* A.9 Audio Class-Specific Request Codes */

            
            #define UAC_SET_			0x00

            
            #define UAC_GET_			0x80


            #define UAC__CUR			0x1

            
            #define UAC__MIN			0x2

            
            #define UAC__MAX			0x3

            
            #define UAC__RES			0x4

            
            #define UAC__MEM			0x5


            #define UAC_SET_CUR			(UAC_SET_ | UAC__CUR)

            
            #define UAC_GET_CUR			(UAC_GET_ | UAC__CUR)

            
            #define UAC_SET_MIN			(UAC_SET_ | UAC__MIN)

            
            #define UAC_GET_MIN			(UAC_GET_ | UAC__MIN)

            
            #define UAC_SET_MAX			(UAC_SET_ | UAC__MAX)

            
            #define UAC_GET_MAX			(UAC_GET_ | UAC__MAX)

            
            #define UAC_SET_RES			(UAC_SET_ | UAC__RES)

            
            #define UAC_GET_RES			(UAC_GET_ | UAC__RES)

            
            #define UAC_SET_MEM			(UAC_SET_ | UAC__MEM)

            
            #define UAC_GET_MEM			(UAC_GET_ | UAC__MEM)


            #define UAC_GET_STAT			0xff


            /* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */

            
            #define UAC_MS_HEADER			0x01

            
            #define UAC_MIDI_IN_JACK		0x02

            
            #define UAC_MIDI_OUT_JACK		0x03


            /* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */

            
            #define UAC_MS_GENERAL			0x01


            /* Terminals - 2.1 USB Terminal Types */

            
            #define UAC_TERMINAL_UNDEFINED		0x100

            
            #define UAC_TERMINAL_STREAMING		0x101

            
            #define UAC_TERMINAL_VENDOR_SPEC	0x1FF


            /* Terminal Control Selectors */

            
            /* 4.3.2  Class-Specific AC Interface Descriptor */

            
            struct uac_ac_header_descriptor {

            
            	__u8  bLength;			/* 8 + n */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */

            
            	__u8  bDescriptorSubtype;	/* UAC_MS_HEADER */

            
            	__le16 bcdADC;			/* 0x0100 */

            
            	__le16 wTotalLength;		/* includes Unit and Terminal desc. */

            
            	__u8  bInCollection;		/* n */

            
            	__u8  baInterfaceNr[];		/* [n] */

            
            } __attribute__ ((packed));


            #define UAC_DT_AC_HEADER_SIZE(n)	(8 + (n))


            /* As above, but more useful for defining your own descriptors: */

            
            #define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n) 			\

            
            struct uac_ac_header_descriptor_##n {				\

            
            	__u8  bLength;						\

            
            	__u8  bDescriptorType;					\

            
            	__u8  bDescriptorSubtype;				\

            
            	__le16 bcdADC;						\

            
            	__le16 wTotalLength;					\

            
            	__u8  bInCollection;					\

            
            	__u8  baInterfaceNr[n];					\

            
            } __attribute__ ((packed))


            /* 4.3.2.1 Input Terminal Descriptor */

            
            struct uac_input_terminal_descriptor {

            
            	__u8  bLength;			/* in bytes: 12 */

            
            	__u8  bDescriptorType;		/* CS_INTERFACE descriptor type */

            
            	__u8  bDescriptorSubtype;	/* INPUT_TERMINAL descriptor subtype */

            
            	__u8  bTerminalID;		/* Constant uniquely terminal ID */

            
            	__le16 wTerminalType;		/* USB Audio Terminal Types */

            
            	__u8  bAssocTerminal;		/* ID of the Output Terminal associated */

            
            	__u8  bNrChannels;		/* Number of logical output channels */

            
            	__le16 wChannelConfig;

            
            	__u8  iChannelNames;

            
            	__u8  iTerminal;

            
            } __attribute__ ((packed));


            #define UAC_DT_INPUT_TERMINAL_SIZE			12


            /* Terminals - 2.2 Input Terminal Types */

            
            #define UAC_INPUT_TERMINAL_UNDEFINED			0x200

            
            #define UAC_INPUT_TERMINAL_MICROPHONE			0x201

            
            #define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE		0x202

            
            #define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE		0x203

            
            #define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE		0x204

            
            #define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY		0x205

            
            #define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY	0x206


            /* 4.3.2.2 Output Terminal Descriptor */

            
            struct uac_output_terminal_descriptor {

            
            	__u8  bLength;			/* in bytes: 9 */

            
            	__u8  bDescriptorType;		/* CS_INTERFACE descriptor type */

            
            	__u8  bDescriptorSubtype;	/* OUTPUT_TERMINAL descriptor subtype */

            
            	__u8  bTerminalID;		/* Constant uniquely terminal ID */

            
            	__le16 wTerminalType;		/* USB Audio Terminal Types */

            
            	__u8  bAssocTerminal;		/* ID of the Input Terminal associated */

            
            	__u8  bSourceID;		/* ID of the connected Unit or Terminal*/

            
            	__u8  iTerminal;

            
            } __attribute__ ((packed));


            #define UAC_DT_OUTPUT_TERMINAL_SIZE			9


            /* Terminals - 2.3 Output Terminal Types */

            
            #define UAC_OUTPUT_TERMINAL_UNDEFINED			0x300

            
            #define UAC_OUTPUT_TERMINAL_SPEAKER			0x301

            
            #define UAC_OUTPUT_TERMINAL_HEADPHONES			0x302

            
            #define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO	0x303

            
            #define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER		0x304

            
            #define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER		0x305

            
            #define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER	0x306

            
            #define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER	0x307


            /* Set bControlSize = 2 as default setting */

            
            #define UAC_DT_FEATURE_UNIT_SIZE(ch)		(7 + ((ch) + 1) * 2)


            /* As above, but more useful for defining your own descriptors: */

            
            #define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch) 		\

            
            struct uac_feature_unit_descriptor_##ch {			\

            
            	__u8  bLength;						\

            
            	__u8  bDescriptorType;					\

            
            	__u8  bDescriptorSubtype;				\

            
            	__u8  bUnitID;						\

            
            	__u8  bSourceID;					\

            
            	__u8  bControlSize;					\

            
            	__le16 bmaControls[ch + 1];				\

            
            	__u8  iFeature;						\

            
            } __attribute__ ((packed))


            /* 4.5.2 Class-Specific AS Interface Descriptor */

            
            struct uac_as_header_descriptor {

            
            	__u8  bLength;			/* in bytes: 7 */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */

            
            	__u8  bDescriptorSubtype;	/* AS_GENERAL */

            
            	__u8  bTerminalLink;		/* Terminal ID of connected Terminal */

            
            	__u8  bDelay;			/* Delay introduced by the data path */

            
            	__le16 wFormatTag;		/* The Audio Data Format */

            
            } __attribute__ ((packed));


            #define UAC_DT_AS_HEADER_SIZE		7


            /* Formats - A.1.1 Audio Data Format Type I Codes */

            
            #define UAC_FORMAT_TYPE_I_UNDEFINED	0x0

            
            #define UAC_FORMAT_TYPE_I_PCM		0x1

            
            #define UAC_FORMAT_TYPE_I_PCM8		0x2

            
            #define UAC_FORMAT_TYPE_I_IEEE_FLOAT	0x3

            
            #define UAC_FORMAT_TYPE_I_ALAW		0x4

            
            #define UAC_FORMAT_TYPE_I_MULAW		0x5


            struct uac_format_type_i_continuous_descriptor {

            
            	__u8  bLength;			/* in bytes: 8 + (ns * 3) */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */

            
            	__u8  bDescriptorSubtype;	/* FORMAT_TYPE */

            
            	__u8  bFormatType;		/* FORMAT_TYPE_1 */

            
            	__u8  bNrChannels;		/* physical channels in the stream */

            
            	__u8  bSubframeSize;		/* */

            
            	__u8  bBitResolution;

            
            	__u8  bSamFreqType;

            
            	__u8  tLowerSamFreq[3];

            
            	__u8  tUpperSamFreq[3];

            
            } __attribute__ ((packed));


            #define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE	14


            struct uac_format_type_i_discrete_descriptor {

            
            	__u8  bLength;			/* in bytes: 8 + (ns * 3) */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */

            
            	__u8  bDescriptorSubtype;	/* FORMAT_TYPE */

            
            	__u8  bFormatType;		/* FORMAT_TYPE_1 */

            
            	__u8  bNrChannels;		/* physical channels in the stream */

            
            	__u8  bSubframeSize;		/* */

            
            	__u8  bBitResolution;

            
            	__u8  bSamFreqType;

            
            	__u8  tSamFreq[][3];

            
            } __attribute__ ((packed));


            #define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n) 		\

            
            struct uac_format_type_i_discrete_descriptor_##n {		\

            
            	__u8  bLength;						\

            
            	__u8  bDescriptorType;					\

            
            	__u8  bDescriptorSubtype;				\

            
            	__u8  bFormatType;					\

            
            	__u8  bNrChannels;					\

            
            	__u8  bSubframeSize;					\

            
            	__u8  bBitResolution;					\

            
            	__u8  bSamFreqType;					\

            
            	__u8  tSamFreq[n][3];					\

            
            } __attribute__ ((packed))


            #define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n)	(8 + (n * 3))


            /* Formats - A.2 Format Type Codes */

            
            #define UAC_FORMAT_TYPE_UNDEFINED	0x0

            
            #define UAC_FORMAT_TYPE_I		0x1

            
            #define UAC_FORMAT_TYPE_II		0x2

            
            #define UAC_FORMAT_TYPE_III		0x3


            struct uac_iso_endpoint_descriptor {

            
            	__u8  bLength;			/* in bytes: 7 */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_ENDPOINT */

            
            	__u8  bDescriptorSubtype;	/* EP_GENERAL */

            
            	__u8  bmAttributes;

            
            	__u8  bLockDelayUnits;

            
            	__le16 wLockDelay;

            
            };

            
            #define UAC_ISO_ENDPOINT_DESC_SIZE	7


            #define UAC_EP_CS_ATTR_SAMPLE_RATE	0x01

            
            #define UAC_EP_CS_ATTR_PITCH_CONTROL	0x02

            
            #define UAC_EP_CS_ATTR_FILL_MAX		0x80


            /* A.10.2 Feature Unit Control Selectors */

            
            #define UAC_FU_CONTROL_UNDEFINED	0x00

            
            #define UAC_MUTE_CONTROL		0x01

            
            #define UAC_VOLUME_CONTROL		0x02

            
            #define UAC_BASS_CONTROL		0x03

            
            #define UAC_MID_CONTROL			0x04

            
            #define UAC_TREBLE_CONTROL		0x05

            
            #define UAC_GRAPHIC_EQUALIZER_CONTROL	0x06

            
            #define UAC_AUTOMATIC_GAIN_CONTROL	0x07

            
            #define UAC_DELAY_CONTROL		0x08

            
            #define UAC_BASS_BOOST_CONTROL		0x09

            
            #define UAC_LOUDNESS_CONTROL		0x0a


            #define UAC_FU_MUTE		(1 << (UAC_MUTE_CONTROL - 1))

            
            #define UAC_FU_VOLUME		(1 << (UAC_VOLUME_CONTROL - 1))

            
            #define UAC_FU_BASS		(1 << (UAC_BASS_CONTROL - 1))

            
            #define UAC_FU_MID		(1 << (UAC_MID_CONTROL - 1))

            
            #define UAC_FU_TREBLE		(1 << (UAC_TREBLE_CONTROL - 1))

            
            #define UAC_FU_GRAPHIC_EQ	(1 << (UAC_GRAPHIC_EQUALIZER_CONTROL - 1))

            
            #define UAC_FU_AUTO_GAIN	(1 << (UAC_AUTOMATIC_GAIN_CONTROL - 1))

            
            #define UAC_FU_DELAY		(1 << (UAC_DELAY_CONTROL - 1))

            
            #define UAC_FU_BASS_BOOST	(1 << (UAC_BASS_BOOST_CONTROL - 1))

            
            #define UAC_FU_LOUDNESS		(1 << (UAC_LOUDNESS_CONTROL - 1))


            #ifdef __KERNEL__


            struct usb_audio_control {

            
            	struct list_head list;

            
            	const char *name;

            
            	u8 type;

            
            	int data[5];

            
            	int (*set)(struct usb_audio_control *con, u8 cmd, int value);

            
            	int (*get)(struct usb_audio_control *con, u8 cmd);

            
            };


            struct usb_audio_control_selector {

            
            	struct list_head list;

            
            	struct list_head control;

            
            	u8 id;

            
            	const char *name;

            
            	u8 type;

            
            	struct usb_descriptor_header *desc;

            
            };


            #endif /* __KERNEL__ */


            #endif /* __LINUX_USB_AUDIO_H */
	/*
	* <linux/usb/audio.h> -- USB Audio definitions.
	*
	* Copyright (C) 2006 Thumtronics Pty Ltd.
	* Developed for Thumtronics by Grey Innovation
	* Ben Williamson <ben.williamson@greyinnovation.com>
	*
	* This software is distributed under the terms of the GNU General Public
	* License ("GPL") version 2, as published by the Free Software Foundation.
	*
	* This file holds USB constants and structures defined
	* by the USB Device Class Definition for Audio Devices.
	* Comments below reference relevant sections of that document:
	*
	* http://www.usb.org/developers/devclass_docs/audio10.pdf
	*/

	#ifndef __LINUX_USB_AUDIO_H
	#define __LINUX_USB_AUDIO_H

	#include <linux/types.h>

	/* A.2 Audio Interface Subclass Codes */
	#define USB_SUBCLASS_AUDIOCONTROL 0x01
	#define USB_SUBCLASS_AUDIOSTREAMING 0x02
	#define USB_SUBCLASS_MIDISTREAMING 0x03

	/* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */
	#define UAC_HEADER 0x01
	#define UAC_INPUT_TERMINAL 0x02
	#define UAC_OUTPUT_TERMINAL 0x03
	#define UAC_MIXER_UNIT 0x04
	#define UAC_SELECTOR_UNIT 0x05
	#define UAC_FEATURE_UNIT 0x06
	#define UAC_PROCESSING_UNIT 0x07
	#define UAC_EXTENSION_UNIT 0x08

	/* A.6 Audio Class-Specific AS Interface Descriptor Subtypes */
	#define UAC_AS_GENERAL 0x01
	#define UAC_FORMAT_TYPE 0x02
	#define UAC_FORMAT_SPECIFIC 0x03

	/* A.8 Audio Class-Specific Endpoint Descriptor Subtypes */
	#define UAC_EP_GENERAL 0x01

	/* A.9 Audio Class-Specific Request Codes */
	#define UAC_SET_ 0x00
	#define UAC_GET_ 0x80

	#define UAC__CUR 0x1
	#define UAC__MIN 0x2
	#define UAC__MAX 0x3
	#define UAC__RES 0x4
	#define UAC__MEM 0x5

	#define UAC_SET_CUR (UAC_SET_ \| UAC__CUR)
	#define UAC_GET_CUR (UAC_GET_ \| UAC__CUR)
	#define UAC_SET_MIN (UAC_SET_ \| UAC__MIN)
	#define UAC_GET_MIN (UAC_GET_ \| UAC__MIN)
	#define UAC_SET_MAX (UAC_SET_ \| UAC__MAX)
	#define UAC_GET_MAX (UAC_GET_ \| UAC__MAX)
	#define UAC_SET_RES (UAC_SET_ \| UAC__RES)
	#define UAC_GET_RES (UAC_GET_ \| UAC__RES)
	#define UAC_SET_MEM (UAC_SET_ \| UAC__MEM)
	#define UAC_GET_MEM (UAC_GET_ \| UAC__MEM)

	#define UAC_GET_STAT 0xff

	/* MIDI - A.1 MS Class-Specific Interface Descriptor Subtypes */
	#define UAC_MS_HEADER 0x01
	#define UAC_MIDI_IN_JACK 0x02
	#define UAC_MIDI_OUT_JACK 0x03

	/* MIDI - A.1 MS Class-Specific Endpoint Descriptor Subtypes */
	#define UAC_MS_GENERAL 0x01

	/* Terminals - 2.1 USB Terminal Types */
	#define UAC_TERMINAL_UNDEFINED 0x100
	#define UAC_TERMINAL_STREAMING 0x101
	#define UAC_TERMINAL_VENDOR_SPEC 0x1FF

	/* Terminal Control Selectors */
	/* 4.3.2 Class-Specific AC Interface Descriptor */
	struct uac_ac_header_descriptor {
	__u8 bLength; /* 8 + n */
	__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
	__u8 bDescriptorSubtype; /* UAC_MS_HEADER */
	__le16 bcdADC; /* 0x0100 */
	__le16 wTotalLength; /* includes Unit and Terminal desc. */
	__u8 bInCollection; /* n */
	__u8 baInterfaceNr[]; /* [n] */
	} __attribute__ ((packed));

	#define UAC_DT_AC_HEADER_SIZE(n) (8 + (n))

	/* As above, but more useful for defining your own descriptors: */
	#define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n) \
	struct uac_ac_header_descriptor_##n { \
	__u8 bLength; \
	__u8 bDescriptorType; \
	__u8 bDescriptorSubtype; \
	__le16 bcdADC; \
	__le16 wTotalLength; \
	__u8 bInCollection; \
	__u8 baInterfaceNr[n]; \
	} __attribute__ ((packed))

	/* 4.3.2.1 Input Terminal Descriptor */
	struct uac_input_terminal_descriptor {
	__u8 bLength; /* in bytes: 12 */
	__u8 bDescriptorType; /* CS_INTERFACE descriptor type */
	__u8 bDescriptorSubtype; /* INPUT_TERMINAL descriptor subtype */
	__u8 bTerminalID; /* Constant uniquely terminal ID */
	__le16 wTerminalType; /* USB Audio Terminal Types */
	__u8 bAssocTerminal; /* ID of the Output Terminal associated */
	__u8 bNrChannels; /* Number of logical output channels */
	__le16 wChannelConfig;
	__u8 iChannelNames;
	__u8 iTerminal;
	} __attribute__ ((packed));

	#define UAC_DT_INPUT_TERMINAL_SIZE 12

	/* Terminals - 2.2 Input Terminal Types */
	#define UAC_INPUT_TERMINAL_UNDEFINED 0x200
	#define UAC_INPUT_TERMINAL_MICROPHONE 0x201
	#define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE 0x202
	#define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE 0x203
	#define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE 0x204
	#define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY 0x205
	#define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY 0x206

	/* 4.3.2.2 Output Terminal Descriptor */
	struct uac_output_terminal_descriptor {
	__u8 bLength; /* in bytes: 9 */
	__u8 bDescriptorType; /* CS_INTERFACE descriptor type */
	__u8 bDescriptorSubtype; /* OUTPUT_TERMINAL descriptor subtype */
	__u8 bTerminalID; /* Constant uniquely terminal ID */
	__le16 wTerminalType; /* USB Audio Terminal Types */
	__u8 bAssocTerminal; /* ID of the Input Terminal associated */
	__u8 bSourceID; /* ID of the connected Unit or Terminal*/
	__u8 iTerminal;
	} __attribute__ ((packed));

	#define UAC_DT_OUTPUT_TERMINAL_SIZE 9

	/* Terminals - 2.3 Output Terminal Types */
	#define UAC_OUTPUT_TERMINAL_UNDEFINED 0x300
	#define UAC_OUTPUT_TERMINAL_SPEAKER 0x301
	#define UAC_OUTPUT_TERMINAL_HEADPHONES 0x302
	#define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO 0x303
	#define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER 0x304
	#define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER 0x305
	#define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER 0x306
	#define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER 0x307

	/* Set bControlSize = 2 as default setting */
	#define UAC_DT_FEATURE_UNIT_SIZE(ch) (7 + ((ch) + 1) * 2)

	/* As above, but more useful for defining your own descriptors: */
	#define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch) \
	struct uac_feature_unit_descriptor_##ch { \
	__u8 bLength; \
	__u8 bDescriptorType; \
	__u8 bDescriptorSubtype; \
	__u8 bUnitID; \
	__u8 bSourceID; \
	__u8 bControlSize; \
	__le16 bmaControls[ch + 1]; \
	__u8 iFeature; \
	} __attribute__ ((packed))

	/* 4.5.2 Class-Specific AS Interface Descriptor */
	struct uac_as_header_descriptor {
	__u8 bLength; /* in bytes: 7 */
	__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
	__u8 bDescriptorSubtype; /* AS_GENERAL */
	__u8 bTerminalLink; /* Terminal ID of connected Terminal */
	__u8 bDelay; /* Delay introduced by the data path */
	__le16 wFormatTag; /* The Audio Data Format */
	} __attribute__ ((packed));

	#define UAC_DT_AS_HEADER_SIZE 7

	/* Formats - A.1.1 Audio Data Format Type I Codes */
	#define UAC_FORMAT_TYPE_I_UNDEFINED 0x0
	#define UAC_FORMAT_TYPE_I_PCM 0x1
	#define UAC_FORMAT_TYPE_I_PCM8 0x2
	#define UAC_FORMAT_TYPE_I_IEEE_FLOAT 0x3
	#define UAC_FORMAT_TYPE_I_ALAW 0x4
	#define UAC_FORMAT_TYPE_I_MULAW 0x5

	struct uac_format_type_i_continuous_descriptor {
	__u8 bLength; /* in bytes: 8 + (ns * 3) */
	__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
	__u8 bDescriptorSubtype; /* FORMAT_TYPE */
	__u8 bFormatType; /* FORMAT_TYPE_1 */
	__u8 bNrChannels; /* physical channels in the stream */
	__u8 bSubframeSize; /* */
	__u8 bBitResolution;
	__u8 bSamFreqType;
	__u8 tLowerSamFreq[3];
	__u8 tUpperSamFreq[3];
	} __attribute__ ((packed));

	#define UAC_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE 14

	struct uac_format_type_i_discrete_descriptor {
	__u8 bLength; /* in bytes: 8 + (ns * 3) */
	__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
	__u8 bDescriptorSubtype; /* FORMAT_TYPE */
	__u8 bFormatType; /* FORMAT_TYPE_1 */
	__u8 bNrChannels; /* physical channels in the stream */
	__u8 bSubframeSize; /* */
	__u8 bBitResolution;
	__u8 bSamFreqType;
	__u8 tSamFreq[][3];
	} __attribute__ ((packed));

	#define DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(n) \
	struct uac_format_type_i_discrete_descriptor_##n { \
	__u8 bLength; \
	__u8 bDescriptorType; \
	__u8 bDescriptorSubtype; \
	__u8 bFormatType; \
	__u8 bNrChannels; \
	__u8 bSubframeSize; \
	__u8 bBitResolution; \
	__u8 bSamFreqType; \
	__u8 tSamFreq[n][3]; \
	} __attribute__ ((packed))

	#define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))

	/* Formats - A.2 Format Type Codes */
	#define UAC_FORMAT_TYPE_UNDEFINED 0x0
	#define UAC_FORMAT_TYPE_I 0x1
	#define UAC_FORMAT_TYPE_II 0x2
	#define UAC_FORMAT_TYPE_III 0x3

	struct uac_iso_endpoint_descriptor {
	__u8 bLength; /* in bytes: 7 */
	__u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */
	__u8 bDescriptorSubtype; /* EP_GENERAL */
	__u8 bmAttributes;
	__u8 bLockDelayUnits;
	__le16 wLockDelay;
	};
	#define UAC_ISO_ENDPOINT_DESC_SIZE 7

	#define UAC_EP_CS_ATTR_SAMPLE_RATE 0x01
	#define UAC_EP_CS_ATTR_PITCH_CONTROL 0x02
	#define UAC_EP_CS_ATTR_FILL_MAX 0x80

	/* A.10.2 Feature Unit Control Selectors */
	#define UAC_FU_CONTROL_UNDEFINED 0x00
	#define UAC_MUTE_CONTROL 0x01
	#define UAC_VOLUME_CONTROL 0x02
	#define UAC_BASS_CONTROL 0x03
	#define UAC_MID_CONTROL 0x04
	#define UAC_TREBLE_CONTROL 0x05
	#define UAC_GRAPHIC_EQUALIZER_CONTROL 0x06
	#define UAC_AUTOMATIC_GAIN_CONTROL 0x07
	#define UAC_DELAY_CONTROL 0x08
	#define UAC_BASS_BOOST_CONTROL 0x09
	#define UAC_LOUDNESS_CONTROL 0x0a

	#define UAC_FU_MUTE (1 << (UAC_MUTE_CONTROL - 1))
	#define UAC_FU_VOLUME (1 << (UAC_VOLUME_CONTROL - 1))
	#define UAC_FU_BASS (1 << (UAC_BASS_CONTROL - 1))
	#define UAC_FU_MID (1 << (UAC_MID_CONTROL - 1))
	#define UAC_FU_TREBLE (1 << (UAC_TREBLE_CONTROL - 1))
	#define UAC_FU_GRAPHIC_EQ (1 << (UAC_GRAPHIC_EQUALIZER_CONTROL - 1))
	#define UAC_FU_AUTO_GAIN (1 << (UAC_AUTOMATIC_GAIN_CONTROL - 1))
	#define UAC_FU_DELAY (1 << (UAC_DELAY_CONTROL - 1))
	#define UAC_FU_BASS_BOOST (1 << (UAC_BASS_BOOST_CONTROL - 1))
	#define UAC_FU_LOUDNESS (1 << (UAC_LOUDNESS_CONTROL - 1))

	#ifdef __KERNEL__

	struct usb_audio_control {
	struct list_head list;
	const char *name;
	u8 type;
	int data[5];
	int (set)(struct usb_audio_control con, u8 cmd, int value);
	int (get)(struct usb_audio_control con, u8 cmd);
	};

	struct usb_audio_control_selector {
	struct list_head list;
	struct list_head control;
	u8 id;
	const char *name;
	u8 type;
	struct usb_descriptor_header *desc;
	};

	#endif /* __KERNEL__ */

	#endif /* __LINUX_USB_AUDIO_H */