usb_handle_request
DEVMETHOD(usb_handle_request, g_audio_handle_request),
DEVMETHOD(usb_handle_request, g_keyboard_handle_request),
DEVMETHOD(usb_handle_request, g_modem_handle_request),
DEVMETHOD(usb_handle_request, g_mouse_handle_request),
DEVMETHOD(usb_handle_request, cdce_handle_request),
DEVMETHOD(usb_handle_request, umb_handle_request),
DEVMETHOD(usb_handle_request, umodem_handle_request),
DEVMETHOD(usb_handle_request, cfumass_handle_request),
DEVMETHOD(usb_handle_request, ustorage_fs_handle_request),
err = usb_handle_request(xfer);
err = usb_handle_request(xfer);
DEVMETHOD(usb_handle_request, NULL); /* dummy */
static usb_error_t usb_handle_request(struct usb_xfer *);