16 /* * retrieving EDID data from a wsdisplay driver * The EDID block will be written into a buffer pointed at by edid_data, * the caller must fill in buffer_size and edid_data, the driver will set * data_size to the number of bytes actually written. * If the buffer is too small the call will fail with EAGAIN and the driver * will set data_size without writing anything into the buffer. */