fbdev/core/fbmon.c

33 #include <video/edid.h>
36 #include "../edid.h"
145 static int check_edid(unsigned char *edid)
147 	unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
170 			if (edid[i] != edid_v1_header[i]) {
177 		b = edid + EDID_STRUCT_DISPLAY;
184 		b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
207 static void fix_edid(unsigned char *edid, int fix)
215 		memcpy(edid, edid_v1_header, 8);
219 		b = edid + EDID_STRUCT_DISPLAY;
221 		edid[127] += 0x80;
225 		b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
249 			csum += edid[i];
251 		edid[127] = 256 - csum;
256 static int edid_checksum(unsigned char *edid)
259 	int i, err = 0, fix = check_edid(edid);
262 		fix_edid(edid, fix);
265 		csum += edid[i];
266 		all_null |= edid[i];
277 static int edid_check_header(unsigned char *edid)
279 	int i, err = 1, fix = check_edid(edid);
282 		fix_edid(edid, fix);
285 		if (edid[i] != edid_v1_header[i])
606  * @edid: EDID data
616 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,
628 	if (edid == NULL || !edid_checksum(edid) ||
629 	    !edid_check_header(edid)) {
634 	ver = edid[EDID_STRUCT_VERSION];
635 	rev = edid[EDID_STRUCT_REVISION];
640 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
653 	block = edid + ESTABLISHED_TIMING_1;
657 	block = edid + STD_TIMING_DESCRIPTIONS_START;
661 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
695 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
700 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
724 		modes = fb_create_modedb(edid, &num_modes, specs);
776 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
780 	block = edid + EDID_STRUCT_DISPLAY;
782 	fb_get_monitor_limits(edid, specs);
894 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
899 	if (edid == NULL || var == NULL)
902 	if (!(edid_checksum(edid)))
905 	if (!(edid_check_header(edid)))
908 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
937 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
942 	if (edid == NULL)
945 	if (!(edid_checksum(edid)))
948 	if (!(edid_check_header(edid)))
953 	specs->version = edid[EDID_STRUCT_VERSION];
954 	specs->revision = edid[EDID_STRUCT_REVISION];
962 	parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
964 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
979 	get_monspecs(edid, specs);
981 	specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);
1405 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1409 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1496 	unsigned char *edid = NULL;
1505 		edid = edid_info.dummy;
1507 	return edid;