Add a struct describing the (fixed) bits of cea681 edid extension blocks, and defines for accessing various bitfields.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- include/edid.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/include/edid.h b/include/edid.h index a69f43a..18ec1d5 100644 --- a/include/edid.h +++ b/include/edid.h @@ -230,6 +230,25 @@ struct edid1_info { unsigned char checksum; } __attribute__ ((__packed__));
+struct edid_cea861_info { + unsigned char extension_tag; +#define EDID_CEA861_EXTENSION_TAG 0x02 + unsigned char revision; + unsigned char dtd_offset; + unsigned char dtd_count; +#define EDID_CEA861_SUPPORTS_UNDERSCAN(_x) \ + GET_BIT(((_x).dtd_count), 7) +#define EDID_CEA861_SUPPORTS_BASIC_AUDIO(_x) \ + GET_BIT(((_x).dtd_count), 6) +#define EDID_CEA861_SUPPORTS_YUV444(_x) \ + GET_BIT(((_x).dtd_count), 5) +#define EDID_CEA861_SUPPORTS_YUV422(_x) \ + GET_BIT(((_x).dtd_count), 4) +#define EDID_CEA861_DTD_COUNT(_x) \ + GET_BITS(((_x).dtd_count), 3, 0) + unsigned char data[124]; +} __attribute__ ((__packed__)); + /** * Print the EDID info. *