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#define USB_DT_CS_DEVICE                0x21

#define USB_DT_CS_CONFIG                0x22

#define USB_DT_CS_STRING                0x23

#define USB_DT_CS_INTERFACE             0x24

#define USB_DT_CS_ENDPOINT              0x25

#define CS_AUDIO_UNDEFINED              0x20

#define CS_AUDIO_DEVICE                 0x21

#define CS_AUDIO_CONFIGURATION          0x22

#define CS_AUDIO_STRING                 0x23

#define CS_AUDIO_INTERFACE              0x24

#define CS_AUDIO_ENDPOINT               0x25

#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 MAX_CHAN                        9

#define MAX_FREQ                        16

#define MAX_IFACE                       8

#define MAX_FORMAT                      8

#define MAX_ALT                         32      /* Sorry, we need quite a few for the Philips webcams */

struct usb_audio_terminal

{

        u8      flags;

        u8      assoc;

        u16     type;                   /* Mic etc */

        u8      channels;

        u8      source;

        u16     chancfg;

};

struct usb_audio_format

{

        u8      type;

        u8      channels;

        u8      num_freq;

        u8      sfz;

        u8      bits;

        u16     freq[MAX_FREQ];

};

struct usb_audio_interface

{

        u8      terminal;

        u8      delay;

        u16     num_formats;

        u16     format_type;

        u8      flags;

        u8      idleconf;       /* Idle config */

#define AU_IFACE_FOUND  1

        struct  usb_audio_format format[MAX_FORMAT];

};

struct usb_audio_device

{

        struct list_head list;

        u8      mixer;

        u8      selector;

        void    *irq_handle;

        u8      num_channels;

        u8      num_dsp_iface;

        u8      channel_map[MAX_CHAN];

        struct usb_audio_terminal terminal[MAX_CHAN];

        struct usb_audio_interface interface[MAX_IFACE][MAX_ALT];

};

/* Audio Class specific Request Codes */

#define SET_CUR    0x01

#define GET_CUR    0x81

#define SET_MIN    0x02

#define GET_MIN    0x82

#define SET_MAX    0x03

#define GET_MAX    0x83

#define SET_RES    0x04

#define GET_RES    0x84

#define SET_MEM    0x05

#define GET_MEM    0x85

#define GET_STAT   0xff

/* Terminal Control Selectors */

#define COPY_PROTECT_CONTROL       0x01

/* Feature Unit Control Selectors */

#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

/* Endpoint Control Selectors */

#define SAMPLING_FREQ_CONTROL      0x01

#define PITCH_CONTROL              0x02