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; Part of API for drivers, see documentation for USBGetParam.

proc usb_get_param

virtual at esp

                dd      ?       ; return address

.pipe           dd      ?

.param          dd      ?

end virtual

        mov     edx, [.param]

        mov     ecx, [.pipe]

        mov     eax, [ecx+usb_pipe.DeviceData]

        test    edx, edx

        jz      .get_device_descriptor

        dec     edx

        jz      .get_config_descriptor

        dec     edx

        jz      .get_speed

        or      eax, -1

        ret     8

.get_device_descriptor:

        add     eax, usb_device_data.DeviceDescriptor

        ret     8

.get_config_descriptor:

        movzx   ecx, [eax+usb_device_data.DeviceDescrSize]

        lea     eax, [eax+ecx+usb_device_data.DeviceDescriptor]

        ret     8

.get_speed:

        movzx   eax, [eax+usb_device_data.Speed]

        ret     8

endp