property.py 文件源码

def __init__(self, drm, id_, type_):
        self._drm = drm
        self.id = id_
        self.type = type_
        self.props = []

        arg = DrmModeObjGetPropertiesC()
        arg.obj_id = self.id
        arg.obj_type = self.type

        fcntl.ioctl(self._drm.fd, DRM_IOCTL_MODE_OBJ_GETPROPERTIES, arg)

        if arg.count_props == 0:
            #print("DrmProperties(%d, 0x%x): arg.count_props=%d" % (self.id, self.type, arg.count_props))
            return

        prop_ids = (ctypes.c_uint32*arg.count_props)()
        arg.props_ptr = ctypes.cast(ctypes.pointer(prop_ids), ctypes.c_void_p).value

        prop_values = (ctypes.c_uint64*arg.count_props)()
        arg.prop_values_ptr = ctypes.cast(ctypes.pointer(prop_values), ctypes.c_void_p).value

        fcntl.ioctl(self._drm.fd, DRM_IOCTL_MODE_OBJ_GETPROPERTIES, arg)

        self._arg = arg

        for i in range(arg.count_props):
            propid = int(prop_ids[i])
            propc = DrmModeObjGetPropertyC()
            propc.prop_id = propid

            fcntl.ioctl(self._drm.fd, DRM_IOCTL_MODE_GETPROPERTY, propc)

            if propc.count_enum_blobs:
                if propc.flags & DRM_MODE_PROP_ENUM:
                    prop = DrmPropertyEnum(self._drm, propid, self.id, self.type)
                elif propc.flags & DRM_MODE_PROP_BITMASK:
                    prop = DrmPropertyBitmask(self._drm, propid, self.id, self.type, propc)
                else:
                    raise ValueError("count_enum_blobs: propc.flags=0x%x" % propc.flags)
            elif propc.flags & DRM_MODE_PROP_BLOB:
                prop = DrmPropertyBlob(self._drm, propid, self.id, self.type, propc)
            else:
                raise ValueError("not count_enum_blobs: propc.flags=0x%x" % propc.flags)

            self.props.append(prop)