Archipelago » qemu

/*

 * QEMU USB audio device

 *

 * written by:

 *  H. Peter Anvin <hpa@linux.intel.com>

 *  Gerd Hoffmann <kraxel@redhat.com>

 *

 * lousely based on usb net device code which is:

 *

 * Copyright (c) 2006 Thomas Sailer

 * Copyright (c) 2008 Andrzej Zaborowski

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "hw/usb.h"

#include "hw/usb/desc.h"

#include "hw/hw.h"

#include "hw/audiodev.h"

#include "audio/audio.h"

#define USBAUDIO_VENDOR_NUM     0x46f4 /* CRC16() of "QEMU" */

#define USBAUDIO_PRODUCT_NUM    0x0002

#define DEV_CONFIG_VALUE        1 /* The one and only */

/* Descriptor subtypes for AC interfaces */

#define DST_AC_HEADER           1

#define DST_AC_INPUT_TERMINAL   2

#define DST_AC_OUTPUT_TERMINAL  3

#define DST_AC_FEATURE_UNIT     6

/* Descriptor subtypes for AS interfaces */

#define DST_AS_GENERAL          1

#define DST_AS_FORMAT_TYPE      2

/* Descriptor subtypes for endpoints */

#define DST_EP_GENERAL          1

enum usb_audio_strings {

    STRING_NULL,

    STRING_MANUFACTURER,

    STRING_PRODUCT,

    STRING_SERIALNUMBER,

    STRING_CONFIG,

    STRING_USBAUDIO_CONTROL,

    STRING_INPUT_TERMINAL,

    STRING_FEATURE_UNIT,

    STRING_OUTPUT_TERMINAL,

    STRING_NULL_STREAM,

    STRING_REAL_STREAM,

};

static const USBDescStrings usb_audio_stringtable = {

    [STRING_MANUFACTURER]       = "QEMU",

    [STRING_PRODUCT]            = "QEMU USB Audio",

    [STRING_SERIALNUMBER]       = "1",

    [STRING_CONFIG]             = "Audio Configuration",

    [STRING_USBAUDIO_CONTROL]   = "Audio Device",

    [STRING_INPUT_TERMINAL]     = "Audio Output Pipe",

    [STRING_FEATURE_UNIT]       = "Audio Output Volume Control",

    [STRING_OUTPUT_TERMINAL]    = "Audio Output Terminal",

    [STRING_NULL_STREAM]        = "Audio Output - Disabled",

    [STRING_REAL_STREAM]        = "Audio Output - 48 kHz Stereo",

};

#define U16(x) ((x) & 0xff), (((x) >> 8) & 0xff)

#define U24(x) U16(x), (((x) >> 16) & 0xff)

#define U32(x) U24(x), (((x) >> 24) & 0xff)

/*

 * A Basic Audio Device uses these specific values

 */

#define USBAUDIO_PACKET_SIZE     192

#define USBAUDIO_SAMPLE_RATE     48000

#define USBAUDIO_PACKET_INTERVAL 1

static const USBDescIface desc_iface[] = {

    {

        .bInterfaceNumber              = 0,

        .bNumEndpoints                 = 0,

        .bInterfaceClass               = USB_CLASS_AUDIO,

        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_CONTROL,

        .bInterfaceProtocol            = 0x04,

        .iInterface                    = STRING_USBAUDIO_CONTROL,

        .ndesc                         = 4,

        .descs = (USBDescOther[]) {

            {

                /* Headphone Class-Specific AC Interface Header Descriptor */

                .data = (uint8_t[]) {

                    0x09,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AC_HEADER,              /*  u8  bDescriptorSubtype */

                    U16(0x0100),                /* u16  bcdADC */

                    U16(0x2b),                  /* u16  wTotalLength */

                    0x01,                       /*  u8  bInCollection */

                    0x01,                       /*  u8  baInterfaceNr */

                }

            },{

                /* Generic Stereo Input Terminal ID1 Descriptor */

                .data = (uint8_t[]) {

                    0x0c,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AC_INPUT_TERMINAL,      /*  u8  bDescriptorSubtype */

                    0x01,                       /*  u8  bTerminalID */

                    U16(0x0101),                /* u16  wTerminalType */

                    0x00,                       /*  u8  bAssocTerminal */

                    0x02,                       /* u16  bNrChannels */

                    U16(0x0003),                /* u16  wChannelConfig */

                    0x00,                       /*  u8  iChannelNames */

                    STRING_INPUT_TERMINAL,      /*  u8  iTerminal */

                }

            },{

                /* Generic Stereo Feature Unit ID2 Descriptor */

                .data = (uint8_t[]) {

                    0x0d,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AC_FEATURE_UNIT,        /*  u8  bDescriptorSubtype */

                    0x02,                       /*  u8  bUnitID */

                    0x01,                       /*  u8  bSourceID */

                    0x02,                       /*  u8  bControlSize */

                    U16(0x0001),                /* u16  bmaControls(0) */

                    U16(0x0002),                /* u16  bmaControls(1) */

                    U16(0x0002),                /* u16  bmaControls(2) */

                    STRING_FEATURE_UNIT,        /*  u8  iFeature */

                }

            },{

                /* Headphone Ouptut Terminal ID3 Descriptor */

                .data = (uint8_t[]) {

                    0x09,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AC_OUTPUT_TERMINAL,     /*  u8  bDescriptorSubtype */

                    0x03,                       /*  u8  bUnitID */

                    U16(0x0301),                /* u16  wTerminalType (SPK) */

                    0x00,                       /*  u8  bAssocTerminal */

                    0x02,                       /*  u8  bSourceID */

                    STRING_OUTPUT_TERMINAL,     /*  u8  iTerminal */

                }

            }

        },

    },{

        .bInterfaceNumber              = 1,

        .bAlternateSetting             = 0,

        .bNumEndpoints                 = 0,

        .bInterfaceClass               = USB_CLASS_AUDIO,

        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_STREAMING,

        .iInterface                    = STRING_NULL_STREAM,

    },{

        .bInterfaceNumber              = 1,

        .bAlternateSetting             = 1,

        .bNumEndpoints                 = 1,

        .bInterfaceClass               = USB_CLASS_AUDIO,

        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_STREAMING,

        .iInterface                    = STRING_REAL_STREAM,

        .ndesc                         = 2,

        .descs = (USBDescOther[]) {

            {

                /* Headphone Class-specific AS General Interface Descriptor */

                .data = (uint8_t[]) {

                    0x07,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AS_GENERAL,             /*  u8  bDescriptorSubtype */

                    0x01,                       /*  u8  bTerminalLink */

                    0x00,                       /*  u8  bDelay */

                    0x01, 0x00,                 /* u16  wFormatTag */

                }

            },{

                /* Headphone Type I Format Type Descriptor */

                .data = (uint8_t[]) {

                    0x0b,                       /*  u8  bLength */

                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */

                    DST_AS_FORMAT_TYPE,         /*  u8  bDescriptorSubtype */

                    0x01,                       /*  u8  bFormatType */

                    0x02,                       /*  u8  bNrChannels */

                    0x02,                       /*  u8  bSubFrameSize */

                    0x10,                       /*  u8  bBitResolution */

                    0x01,                       /*  u8  bSamFreqType */

                    U24(USBAUDIO_SAMPLE_RATE),  /* u24  tSamFreq */

                }

            }

        },

        .eps = (USBDescEndpoint[]) {

            {

                .bEndpointAddress      = USB_DIR_OUT | 0x01,

                .bmAttributes          = 0x0d,

                .wMaxPacketSize        = USBAUDIO_PACKET_SIZE,

                .bInterval             = 1,

                .is_audio              = 1,

                /* Stereo Headphone Class-specific

                   AS Audio Data Endpoint Descriptor */

                .extra = (uint8_t[]) {

                    0x07,                       /*  u8  bLength */

                    USB_DT_CS_ENDPOINT,         /*  u8  bDescriptorType */

                    DST_EP_GENERAL,             /*  u8  bDescriptorSubtype */

                    0x00,                       /*  u8  bmAttributes */

                    0x00,                       /*  u8  bLockDelayUnits */

                    U16(0x0000),                /* u16  wLockDelay */

                },

            },

        }

    }

};

static const USBDescDevice desc_device = {

    .bcdUSB                        = 0x0200,

    .bMaxPacketSize0               = 64,

    .bNumConfigurations            = 1,

    .confs = (USBDescConfig[]) {

        {

            .bNumInterfaces        = 2,

            .bConfigurationValue   = DEV_CONFIG_VALUE,

            .iConfiguration        = STRING_CONFIG,

            .bmAttributes          = 0xc0,

            .bMaxPower             = 0x32,

            .nif = ARRAY_SIZE(desc_iface),

            .ifs = desc_iface,

        },

    },

};

static const USBDesc desc_audio = {

    .id = {

        .idVendor          = USBAUDIO_VENDOR_NUM,

        .idProduct         = USBAUDIO_PRODUCT_NUM,

        .bcdDevice         = 0,

        .iManufacturer     = STRING_MANUFACTURER,

        .iProduct          = STRING_PRODUCT,

        .iSerialNumber     = STRING_SERIALNUMBER,

    },

    .full = &desc_device,

    .str  = usb_audio_stringtable,

};

/*

 * A USB audio device supports an arbitrary number of alternate

 * interface settings for each interface.  Each corresponds to a block

 * diagram of parameterized blocks.  This can thus refer to things like

 * number of channels, data rates, or in fact completely different

 * block diagrams.  Alternative setting 0 is always the null block diagram,

 * which is used by a disabled device.

 */

enum usb_audio_altset {

    ALTSET_OFF  = 0x00,         /* No endpoint */

    ALTSET_ON   = 0x01,         /* Single endpoint */

};

/*

 * Class-specific control requests

 */

#define CR_SET_CUR      0x01

#define CR_GET_CUR      0x81

#define CR_SET_MIN      0x02

#define CR_GET_MIN      0x82

#define CR_SET_MAX      0x03

#define CR_GET_MAX      0x83

#define CR_SET_RES      0x04

#define CR_GET_RES      0x84

#define CR_SET_MEM      0x05

#define CR_GET_MEM      0x85

#define CR_GET_STAT     0xff

/*

 * 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

/*

 * buffering

 */

struct streambuf {

    uint8_t *data;

    uint32_t size;

    uint32_t prod;

    uint32_t cons;

};

static void streambuf_init(struct streambuf *buf, uint32_t size)

{

    g_free(buf->data);

    buf->size = size - (size % USBAUDIO_PACKET_SIZE);

    buf->data = g_malloc(buf->size);

    buf->prod = 0;

    buf->cons = 0;

}

static void streambuf_fini(struct streambuf *buf)

{

    g_free(buf->data);

    buf->data = NULL;

}

static int streambuf_put(struct streambuf *buf, USBPacket *p)

{

    uint32_t free = buf->size - (buf->prod - buf->cons);

    if (!free) {

        return 0;

    }

    assert(free >= USBAUDIO_PACKET_SIZE);

    usb_packet_copy(p, buf->data + (buf->prod % buf->size),

                    USBAUDIO_PACKET_SIZE);

    buf->prod += USBAUDIO_PACKET_SIZE;

    return USBAUDIO_PACKET_SIZE;

}

static uint8_t *streambuf_get(struct streambuf *buf)

{

    uint32_t used = buf->prod - buf->cons;

    uint8_t *data;

    if (!used) {

        return NULL;

    }

    assert(used >= USBAUDIO_PACKET_SIZE);

    data = buf->data + (buf->cons % buf->size);

    buf->cons += USBAUDIO_PACKET_SIZE;

    return data;

}

typedef struct USBAudioState {

    /* qemu interfaces */

    USBDevice dev;

    QEMUSoundCard card;

    /* state */

    struct {

        enum usb_audio_altset altset;

        struct audsettings as;

        SWVoiceOut *voice;

        bool mute;

        uint8_t vol[2];

        struct streambuf buf;

    } out;

    /* properties */

    uint32_t debug;

    uint32_t buffer;

} USBAudioState;

static void output_callback(void *opaque, int avail)

{

    USBAudioState *s = opaque;

    uint8_t *data;

    for (;;) {

        if (avail < USBAUDIO_PACKET_SIZE) {

            return;

        }

        data = streambuf_get(&s->out.buf);

        if (NULL == data) {

            return;

        }

        AUD_write(s->out.voice, data, USBAUDIO_PACKET_SIZE);

        avail -= USBAUDIO_PACKET_SIZE;

    }

}

static int usb_audio_set_output_altset(USBAudioState *s, int altset)

{

    switch (altset) {

    case ALTSET_OFF:

        streambuf_init(&s->out.buf, s->buffer);

        AUD_set_active_out(s->out.voice, false);

        break;

    case ALTSET_ON:

        AUD_set_active_out(s->out.voice, true);

        break;

    default:

        return -1;

    }

    if (s->debug) {

        fprintf(stderr, "usb-audio: set interface %d\n", altset);

    }

    s->out.altset = altset;

    return 0;

}

/*

 * Note: we arbitrarily map the volume control range onto -inf..+8 dB

 */

#define ATTRIB_ID(cs, attrib, idif)     \

    (((cs) << 24) | ((attrib) << 16) | (idif))

static int usb_audio_get_control(USBAudioState *s, uint8_t attrib,

                                 uint16_t cscn, uint16_t idif,

                                 int length, uint8_t *data)

{

    uint8_t cs = cscn >> 8;

    uint8_t cn = cscn - 1;      /* -1 for the non-present master control */

    uint32_t aid = ATTRIB_ID(cs, attrib, idif);

    int ret = USB_RET_STALL;

    switch (aid) {

    case ATTRIB_ID(MUTE_CONTROL, CR_GET_CUR, 0x0200):

        data[0] = s->out.mute;

        ret = 1;

        break;

    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_CUR, 0x0200):

        if (cn < 2) {

            uint16_t vol = (s->out.vol[cn] * 0x8800 + 127) / 255 + 0x8000;

            data[0] = vol;

            data[1] = vol >> 8;

            ret = 2;

        }

        break;

    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_MIN, 0x0200):

        if (cn < 2) {

            data[0] = 0x01;

            data[1] = 0x80;

            ret = 2;

        }

        break;

    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_MAX, 0x0200):

        if (cn < 2) {

            data[0] = 0x00;

            data[1] = 0x08;

            ret = 2;

        }

        break;

    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_RES, 0x0200):

        if (cn < 2) {

            data[0] = 0x88;

            data[1] = 0x00;

            ret = 2;

        }

        break;

    }

    return ret;

}

static int usb_audio_set_control(USBAudioState *s, uint8_t attrib,

                                 uint16_t cscn, uint16_t idif,

                                 int length, uint8_t *data)

{

    uint8_t cs = cscn >> 8;

    uint8_t cn = cscn - 1;      /* -1 for the non-present master control */

    uint32_t aid = ATTRIB_ID(cs, attrib, idif);

    int ret = USB_RET_STALL;

    bool set_vol = false;

    switch (aid) {

    case ATTRIB_ID(MUTE_CONTROL, CR_SET_CUR, 0x0200):

        s->out.mute = data[0] & 1;

        set_vol = true;

        ret = 0;

        break;

    case ATTRIB_ID(VOLUME_CONTROL, CR_SET_CUR, 0x0200):

        if (cn < 2) {

            uint16_t vol = data[0] + (data[1] << 8);

            if (s->debug) {

                fprintf(stderr, "usb-audio: vol %04x\n", (uint16_t)vol);

            }

            vol -= 0x8000;

            vol = (vol * 255 + 0x4400) / 0x8800;

            if (vol > 255) {

                vol = 255;

            }

            s->out.vol[cn] = vol;

            set_vol = true;

            ret = 0;

        }

        break;

    }

    if (set_vol) {

        if (s->debug) {

            fprintf(stderr, "usb-audio: mute %d, lvol %3d, rvol %3d\n",

                    s->out.mute, s->out.vol[0], s->out.vol[1]);

        }

        AUD_set_volume_out(s->out.voice, s->out.mute,

                           s->out.vol[0], s->out.vol[1]);

    }

    return ret;

}

static int usb_audio_handle_control(USBDevice *dev, USBPacket *p,

                                    int request, int value, int index,

                                    int length, uint8_t *data)

{

    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);

    int ret = 0;

    if (s->debug) {

        fprintf(stderr, "usb-audio: control transaction: "

                "request 0x%04x value 0x%04x index 0x%04x length 0x%04x\n",

                request, value, index, length);

    }

    ret = usb_desc_handle_control(dev, p, request, value, index, length, data);

    if (ret >= 0) {

        return ret;

    }

    switch (request) {

    case ClassInterfaceRequest | CR_GET_CUR:

    case ClassInterfaceRequest | CR_GET_MIN:

    case ClassInterfaceRequest | CR_GET_MAX:

    case ClassInterfaceRequest | CR_GET_RES:

        ret = usb_audio_get_control(s, request & 0xff, value, index,

                                    length, data);

        if (ret < 0) {

            if (s->debug) {

                fprintf(stderr, "usb-audio: fail: get control\n");

            }

            goto fail;

        }

        break;

    case ClassInterfaceOutRequest | CR_SET_CUR:

    case ClassInterfaceOutRequest | CR_SET_MIN:

    case ClassInterfaceOutRequest | CR_SET_MAX:

    case ClassInterfaceOutRequest | CR_SET_RES:

        ret = usb_audio_set_control(s, request & 0xff, value, index,

                                    length, data);

        if (ret < 0) {

            if (s->debug) {

                fprintf(stderr, "usb-audio: fail: set control\n");

            }

            goto fail;

        }

        break;

    default:

fail:

        if (s->debug) {

            fprintf(stderr, "usb-audio: failed control transaction: "

                    "request 0x%04x value 0x%04x index 0x%04x length 0x%04x\n",

                    request, value, index, length);

        }

        ret = USB_RET_STALL;

        break;

    }

    return ret;

}

static void usb_audio_set_interface(USBDevice *dev, int iface,

                                    int old, int value)

{

    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);

    if (iface == 1) {

        usb_audio_set_output_altset(s, value);

    }

}

static void usb_audio_handle_reset(USBDevice *dev)

{

    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);

    if (s->debug) {

        fprintf(stderr, "usb-audio: reset\n");

    }

    usb_audio_set_output_altset(s, ALTSET_OFF);

}

static int usb_audio_handle_dataout(USBAudioState *s, USBPacket *p)

{

    int rc;

    if (s->out.altset == ALTSET_OFF) {

        return USB_RET_STALL;

    }

    rc = streambuf_put(&s->out.buf, p);

    if (rc < p->iov.size && s->debug > 1) {

        fprintf(stderr, "usb-audio: output overrun (%zd bytes)\n",

                p->iov.size - rc);

    }

    return 0;

}

static int usb_audio_handle_data(USBDevice *dev, USBPacket *p)

{

    USBAudioState *s = (USBAudioState *) dev;

    int ret = 0;

    switch (p->pid) {

    case USB_TOKEN_OUT:

        switch (p->ep->nr) {

        case 1:

            ret = usb_audio_handle_dataout(s, p);

            break;

        default:

            goto fail;

        }

        break;

    default:

fail:

        ret = USB_RET_STALL;

        break;

    }

    if (ret == USB_RET_STALL && s->debug) {

        fprintf(stderr, "usb-audio: failed data transaction: "

                        "pid 0x%x ep 0x%x len 0x%zx\n",

                        p->pid, p->ep->nr, p->iov.size);

    }

    return ret;

}

static void usb_audio_handle_destroy(USBDevice *dev)

{

    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);

    if (s->debug) {

        fprintf(stderr, "usb-audio: destroy\n");

    }

    usb_audio_set_output_altset(s, ALTSET_OFF);

    AUD_close_out(&s->card, s->out.voice);

    AUD_remove_card(&s->card);

    streambuf_fini(&s->out.buf);

}

static int usb_audio_initfn(USBDevice *dev)

{

    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);

    usb_desc_init(dev);

    s->dev.opaque = s;

    AUD_register_card("usb-audio", &s->card);

    s->out.altset        = ALTSET_OFF;

    s->out.mute          = false;

    s->out.vol[0]        = 240; /* 0 dB */

    s->out.vol[1]        = 240; /* 0 dB */

    s->out.as.freq       = USBAUDIO_SAMPLE_RATE;

    s->out.as.nchannels  = 2;

    s->out.as.fmt        = AUD_FMT_S16;

    s->out.as.endianness = 0;

    streambuf_init(&s->out.buf, s->buffer);

    s->out.voice = AUD_open_out(&s->card, s->out.voice, "usb-audio",

                                s, output_callback, &s->out.as);

    AUD_set_volume_out(s->out.voice, s->out.mute, s->out.vol[0], s->out.vol[1]);

    AUD_set_active_out(s->out.voice, 0);

    return 0;

}

static const VMStateDescription vmstate_usb_audio = {

    .name = "usb-audio",

    .unmigratable = 1,

};

static Property usb_audio_properties[] = {

    DEFINE_PROP_UINT32("debug", USBAudioState, debug, 0),

    DEFINE_PROP_UINT32("buffer", USBAudioState, buffer,

                       8 * USBAUDIO_PACKET_SIZE),

    DEFINE_PROP_END_OF_LIST(),

};

static void usb_audio_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    USBDeviceClass *k = USB_DEVICE_CLASS(klass);

    dc->vmsd          = &vmstate_usb_audio;

    dc->props         = usb_audio_properties;

    k->product_desc   = "QEMU USB Audio Interface";

    k->usb_desc       = &desc_audio;

    k->init           = usb_audio_initfn;

    k->handle_reset   = usb_audio_handle_reset;

    k->handle_control = usb_audio_handle_control;

    k->handle_data    = usb_audio_handle_data;

    k->handle_destroy = usb_audio_handle_destroy;

    k->set_interface  = usb_audio_set_interface;

}

static TypeInfo usb_audio_info = {

    .name          = "usb-audio",

    .parent        = TYPE_USB_DEVICE,

    .instance_size = sizeof(USBAudioState),

    .class_init    = usb_audio_class_init,

};

static void usb_audio_register_types(void)

{

    type_register_static(&usb_audio_info);

    usb_legacy_register("usb-audio", "audio", NULL);

}

type_init(usb_audio_register_types)