Add a helper function to check the checksum of an EDID data block.
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
common/edid.c | 11 +++++++++++
include/edid.h | 9 +++++++++
2 files changed, 20 insertions(+)
diff --git a/common/edid.c b/common/edid.c
index e41cd3e..e5d35b2 100644
--- a/common/edid.c
+++ b/common/edid.c
@@ -353,3 +353,14 @@ int edid_dtd_to_fbmode(struct edid_detailed_timing *t,
return 0;
}
+
+int edid_check_checksum(u8 *edid_block)
+{
+ u8 checksum = 0;
+ int i;
+
+ for (i = 0; i < 128; i++)
+ checksum += edid_block[i];
+
+ return (checksum == 0) ? 0 : -EINVAL;
+}
diff --git a/include/edid.h b/include/edid.h
index d66f76b..b32f42c 100644
--- a/include/edid.h
+++ b/include/edid.h
@@ -273,4 +273,13 @@ int edid_get_ranges(struct edid1_info *edid, unsigned int
*hmin,
int edid_dtd_to_fbmode(struct edid_detailed_timing *t,
struct fb_videomode *mode, char *name, int name_len);
+/**
+ * Check checksum of a 128 bytes EDID data block
+ *
+ * @param edid_block EDID block data
+ *
+ * @return 0 on success, or a negative errno on error
+ */
+int edid_check_checksum(u8 *edid_block);
+
#endif /* __EDID_H_ */
--
2.1.0
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