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

            
            #define USB_SUBCLASS_VENDOR_SPEC	0xff


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

            
            #define HEADER				0x01

            
            #define INPUT_TERMINAL			0x02

            
            #define OUTPUT_TERMINAL			0x03

            
            #define MIXER_UNIT			0x04

            
            #define SELECTOR_UNIT			0x05

            
            #define FEATURE_UNIT			0x06

            
            #define PROCESSING_UNIT			0x07

            
            #define EXTENSION_UNIT			0x08


            #define AS_GENERAL			0x01

            
            #define FORMAT_TYPE			0x02

            
            #define FORMAT_SPECIFIC			0x03


            #define EP_GENERAL			0x01


            #define MS_GENERAL			0x01

            
            #define MIDI_IN_JACK			0x02

            
            #define MIDI_OUT_JACK			0x03


            /* endpoint attributes */

            
            #define EP_ATTR_MASK			0x0c

            
            #define EP_ATTR_ASYNC			0x04

            
            #define EP_ATTR_ADAPTIVE		0x08

            
            #define EP_ATTR_SYNC			0x0c


            /* cs endpoint attributes */

            
            #define EP_CS_ATTR_SAMPLE_RATE		0x01

            
            #define EP_CS_ATTR_PITCH_CONTROL	0x02

            
            #define EP_CS_ATTR_FILL_MAX		0x80


            /* Audio Class specific Request Codes */

            
            #define USB_AUDIO_SET_INTF		0x21

            
            #define USB_AUDIO_SET_ENDPOINT		0x22

            
            #define USB_AUDIO_GET_INTF		0xa1

            
            #define USB_AUDIO_GET_ENDPOINT		0xa2


            #define SET_	0x00

            
            #define GET_	0x80


            #define _CUR	0x1

            
            #define _MIN	0x2

            
            #define _MAX	0x3

            
            #define _RES	0x4

            
            #define _MEM	0x5


            #define SET_CUR		(SET_ | _CUR)

            
            #define GET_CUR		(GET_ | _CUR)

            
            #define SET_MIN		(SET_ | _MIN)

            
            #define GET_MIN		(GET_ | _MIN)

            
            #define SET_MAX		(SET_ | _MAX)

            
            #define GET_MAX		(GET_ | _MAX)

            
            #define SET_RES		(SET_ | _RES)

            
            #define GET_RES		(GET_ | _RES)

            
            #define SET_MEM		(SET_ | _MEM)

            
            #define GET_MEM		(GET_ | _MEM)


            #define GET_STAT	0xff


            #define USB_AC_TERMINAL_UNDEFINED	0x100

            
            #define USB_AC_TERMINAL_STREAMING	0x101

            
            #define USB_AC_TERMINAL_VENDOR_SPEC	0x1FF


            /* Terminal Control Selectors */

            
            /* 4.3.2  Class-Specific AC Interface Descriptor */

            
            struct usb_ac_header_descriptor {

            
            	__u8  bLength;			/* 8 + n */

            
            	__u8  bDescriptorType;		/* USB_DT_CS_INTERFACE */

            
            	__u8  bDescriptorSubtype;	/* USB_MS_HEADER */

            
            	__le16 bcdADC;			/* 0x0100 */

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

            
            	__u8  bInCollection;		/* n */

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

            
            } __attribute__ ((packed));


            #define USB_DT_AC_HEADER_SIZE(n)	(8 + (n))


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

            
            #define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) 			\

            
            struct usb_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 usb_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 USB_DT_AC_INPUT_TERMINAL_SIZE			12


            #define USB_AC_INPUT_TERMINAL_UNDEFINED			0x200

            
            #define USB_AC_INPUT_TERMINAL_MICROPHONE		0x201

            
            #define USB_AC_INPUT_TERMINAL_DESKTOP_MICROPHONE	0x202

            
            #define USB_AC_INPUT_TERMINAL_PERSONAL_MICROPHONE	0x203

            
            #define USB_AC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE	0x204

            
            #define USB_AC_INPUT_TERMINAL_MICROPHONE_ARRAY		0x205

            
            #define USB_AC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY	0x206


            /* 4.3.2.2 Output Terminal Descriptor */

            
            struct usb_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 USB_DT_AC_OUTPUT_TERMINAL_SIZE				9


            #define USB_AC_OUTPUT_TERMINAL_UNDEFINED			0x300

            
            #define USB_AC_OUTPUT_TERMINAL_SPEAKER				0x301

            
            #define USB_AC_OUTPUT_TERMINAL_HEADPHONES			0x302

            
            #define USB_AC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO	0x303

            
            #define USB_AC_OUTPUT_TERMINAL_DESKTOP_SPEAKER			0x304

            
            #define USB_AC_OUTPUT_TERMINAL_ROOM_SPEAKER			0x305

            
            #define USB_AC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER		0x306

            
            #define USB_AC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER		0x307


            /* Set bControlSize = 2 as default setting */

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


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

            
            #define DECLARE_USB_AC_FEATURE_UNIT_DESCRIPTOR(ch) 		\

            
            struct usb_ac_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 usb_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 USB_DT_AS_HEADER_SIZE		7


            #define USB_AS_AUDIO_FORMAT_TYPE_I_UNDEFINED	0x0

            
            #define USB_AS_AUDIO_FORMAT_TYPE_I_PCM		0x1

            
            #define USB_AS_AUDIO_FORMAT_TYPE_I_PCM8		0x2

            
            #define USB_AS_AUDIO_FORMAT_TYPE_I_IEEE_FLOAT	0x3

            
            #define USB_AS_AUDIO_FORMAT_TYPE_I_ALAW		0x4

            
            #define USB_AS_AUDIO_FORMAT_TYPE_I_MULAW	0x5


            struct usb_as_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 USB_AS_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE	14


            struct usb_as_formate_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_USB_AS_FORMAT_TYPE_I_DISCRETE_DESC(n) 		\

            
            struct usb_as_formate_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 USB_AS_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n)	(8 + (n * 3))


            #define USB_AS_FORMAT_TYPE_UNDEFINED	0x0

            
            #define USB_AS_FORMAT_TYPE_I		0x1

            
            #define USB_AS_FORMAT_TYPE_II		0x2

            
            #define USB_AS_FORMAT_TYPE_III		0x3


            #define USB_AS_ENDPOINT_ASYNC		(1 << 2)

            
            #define USB_AS_ENDPOINT_ADAPTIVE	(2 << 2)

            
            #define USB_AS_ENDPOINT_SYNC		(3 << 2)


            struct usb_as_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 USB_AS_ISO_ENDPOINT_DESC_SIZE	7


            #define FU_CONTROL_UNDEFINED		0x00

            
            #define MUTE_CONTROL			0x01

            
            #define VOLUME_CONTROL			0x02

            
            #define BASS_CONTROL			0x03

            
            #define MID_CONTROL			0x04

            
            #define TREBLE_CONTROL			0x05

            
            #define GRAPHIC_EQUALIZER_CONTROL	0x06

            
            #define AUTOMATIC_GAIN_CONTROL		0x07

            
            #define DELAY_CONTROL			0x08

            
            #define BASS_BOOST_CONTROL		0x09

            
            #define LOUDNESS_CONTROL		0x0a


            #define FU_MUTE		(1 << (MUTE_CONTROL - 1))

            
            #define FU_VOLUME	(1 << (VOLUME_CONTROL - 1))

            
            #define FU_BASS		(1 << (BASS_CONTROL - 1))

            
            #define FU_MID		(1 << (MID_CONTROL - 1))

            
            #define FU_TREBLE	(1 << (TREBLE_CONTROL - 1))

            
            #define FU_GRAPHIC_EQ	(1 << (GRAPHIC_EQUALIZER_CONTROL - 1))

            
            #define FU_AUTO_GAIN	(1 << (AUTOMATIC_GAIN_CONTROL - 1))

            
            #define FU_DELAY	(1 << (DELAY_CONTROL - 1))

            
            #define FU_BASS_BOOST	(1 << (BASS_BOOST_CONTROL - 1))

            
            #define FU_LOUDNESS	(1 << (LOUDNESS_CONTROL - 1))


            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);

            
            };


            static inline int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)

            
            {

            
            	con->data[cmd] = value;


            	return 0;

            
            }


            static inline int generic_get_cmd(struct usb_audio_control *con, u8 cmd)

            
            {

            
            	return con->data[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 /* __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
	#define USB_SUBCLASS_VENDOR_SPEC 0xff

	/* A.5 Audio Class-Specific AC interface Descriptor Subtypes*/
	#define HEADER 0x01
	#define INPUT_TERMINAL 0x02
	#define OUTPUT_TERMINAL 0x03
	#define MIXER_UNIT 0x04
	#define SELECTOR_UNIT 0x05
	#define FEATURE_UNIT 0x06
	#define PROCESSING_UNIT 0x07
	#define EXTENSION_UNIT 0x08

	#define AS_GENERAL 0x01
	#define FORMAT_TYPE 0x02
	#define FORMAT_SPECIFIC 0x03

	#define EP_GENERAL 0x01

	#define MS_GENERAL 0x01
	#define MIDI_IN_JACK 0x02
	#define MIDI_OUT_JACK 0x03

	/* endpoint attributes */
	#define EP_ATTR_MASK 0x0c
	#define EP_ATTR_ASYNC 0x04
	#define EP_ATTR_ADAPTIVE 0x08
	#define EP_ATTR_SYNC 0x0c

	/* cs endpoint attributes */
	#define EP_CS_ATTR_SAMPLE_RATE 0x01
	#define EP_CS_ATTR_PITCH_CONTROL 0x02
	#define EP_CS_ATTR_FILL_MAX 0x80

	/* Audio Class specific Request Codes */
	#define USB_AUDIO_SET_INTF 0x21
	#define USB_AUDIO_SET_ENDPOINT 0x22
	#define USB_AUDIO_GET_INTF 0xa1
	#define USB_AUDIO_GET_ENDPOINT 0xa2

	#define SET_ 0x00
	#define GET_ 0x80

	#define _CUR 0x1
	#define _MIN 0x2
	#define _MAX 0x3
	#define _RES 0x4
	#define _MEM 0x5

	#define SET_CUR (SET_ \| _CUR)
	#define GET_CUR (GET_ \| _CUR)
	#define SET_MIN (SET_ \| _MIN)
	#define GET_MIN (GET_ \| _MIN)
	#define SET_MAX (SET_ \| _MAX)
	#define GET_MAX (GET_ \| _MAX)
	#define SET_RES (SET_ \| _RES)
	#define GET_RES (GET_ \| _RES)
	#define SET_MEM (SET_ \| _MEM)
	#define GET_MEM (GET_ \| _MEM)

	#define GET_STAT 0xff

	#define USB_AC_TERMINAL_UNDEFINED 0x100
	#define USB_AC_TERMINAL_STREAMING 0x101
	#define USB_AC_TERMINAL_VENDOR_SPEC 0x1FF

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

	#define USB_DT_AC_HEADER_SIZE(n) (8 + (n))

	/* As above, but more useful for defining your own descriptors: */
	#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) \
	struct usb_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 usb_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 USB_DT_AC_INPUT_TERMINAL_SIZE 12

	#define USB_AC_INPUT_TERMINAL_UNDEFINED 0x200
	#define USB_AC_INPUT_TERMINAL_MICROPHONE 0x201
	#define USB_AC_INPUT_TERMINAL_DESKTOP_MICROPHONE 0x202
	#define USB_AC_INPUT_TERMINAL_PERSONAL_MICROPHONE 0x203
	#define USB_AC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE 0x204
	#define USB_AC_INPUT_TERMINAL_MICROPHONE_ARRAY 0x205
	#define USB_AC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY 0x206

	/* 4.3.2.2 Output Terminal Descriptor */
	struct usb_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 USB_DT_AC_OUTPUT_TERMINAL_SIZE 9

	#define USB_AC_OUTPUT_TERMINAL_UNDEFINED 0x300
	#define USB_AC_OUTPUT_TERMINAL_SPEAKER 0x301
	#define USB_AC_OUTPUT_TERMINAL_HEADPHONES 0x302
	#define USB_AC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO 0x303
	#define USB_AC_OUTPUT_TERMINAL_DESKTOP_SPEAKER 0x304
	#define USB_AC_OUTPUT_TERMINAL_ROOM_SPEAKER 0x305
	#define USB_AC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER 0x306
	#define USB_AC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER 0x307

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

	/* As above, but more useful for defining your own descriptors: */
	#define DECLARE_USB_AC_FEATURE_UNIT_DESCRIPTOR(ch) \
	struct usb_ac_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 usb_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 USB_DT_AS_HEADER_SIZE 7

	#define USB_AS_AUDIO_FORMAT_TYPE_I_UNDEFINED 0x0
	#define USB_AS_AUDIO_FORMAT_TYPE_I_PCM 0x1
	#define USB_AS_AUDIO_FORMAT_TYPE_I_PCM8 0x2
	#define USB_AS_AUDIO_FORMAT_TYPE_I_IEEE_FLOAT 0x3
	#define USB_AS_AUDIO_FORMAT_TYPE_I_ALAW 0x4
	#define USB_AS_AUDIO_FORMAT_TYPE_I_MULAW 0x5

	struct usb_as_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 USB_AS_FORMAT_TYPE_I_CONTINUOUS_DESC_SIZE 14

	struct usb_as_formate_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_USB_AS_FORMAT_TYPE_I_DISCRETE_DESC(n) \
	struct usb_as_formate_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 USB_AS_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n) (8 + (n * 3))

	#define USB_AS_FORMAT_TYPE_UNDEFINED 0x0
	#define USB_AS_FORMAT_TYPE_I 0x1
	#define USB_AS_FORMAT_TYPE_II 0x2
	#define USB_AS_FORMAT_TYPE_III 0x3

	#define USB_AS_ENDPOINT_ASYNC (1 << 2)
	#define USB_AS_ENDPOINT_ADAPTIVE (2 << 2)
	#define USB_AS_ENDPOINT_SYNC (3 << 2)

	struct usb_as_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 USB_AS_ISO_ENDPOINT_DESC_SIZE 7

	#define FU_CONTROL_UNDEFINED 0x00
	#define MUTE_CONTROL 0x01
	#define VOLUME_CONTROL 0x02
	#define BASS_CONTROL 0x03
	#define MID_CONTROL 0x04
	#define TREBLE_CONTROL 0x05
	#define GRAPHIC_EQUALIZER_CONTROL 0x06
	#define AUTOMATIC_GAIN_CONTROL 0x07
	#define DELAY_CONTROL 0x08
	#define BASS_BOOST_CONTROL 0x09
	#define LOUDNESS_CONTROL 0x0a

	#define FU_MUTE (1 << (MUTE_CONTROL - 1))
	#define FU_VOLUME (1 << (VOLUME_CONTROL - 1))
	#define FU_BASS (1 << (BASS_CONTROL - 1))
	#define FU_MID (1 << (MID_CONTROL - 1))
	#define FU_TREBLE (1 << (TREBLE_CONTROL - 1))
	#define FU_GRAPHIC_EQ (1 << (GRAPHIC_EQUALIZER_CONTROL - 1))
	#define FU_AUTO_GAIN (1 << (AUTOMATIC_GAIN_CONTROL - 1))
	#define FU_DELAY (1 << (DELAY_CONTROL - 1))
	#define FU_BASS_BOOST (1 << (BASS_BOOST_CONTROL - 1))
	#define FU_LOUDNESS (1 << (LOUDNESS_CONTROL - 1))

	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);
	};

	static inline int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
	{
	con->data[cmd] = value;

	return 0;
	}

	static inline int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
	{
	return con->data[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 /* __LINUX_USB_AUDIO_H */