8  * The EDID Parser is a conglomeration from the following sources:
33 #include <video/edid.h>
36 #include "../edid.h"
39  * EDID parser
42 #undef DEBUG  /* define this for verbose EDID parsing output */
145 static int check_edid(unsigned char *edid)  in check_edid()  argument
147 	unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];  in check_edid()
170 			if (edid[i] != edid_v1_header[i]) {  in check_edid()
177 		b = edid + EDID_STRUCT_DISPLAY;  in check_edid()
184 		b = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in check_edid()
200 		printk("fbmon: The EDID Block of "  in check_edid()
207 static void fix_edid(unsigned char *edid, int fix)  in fix_edid()  argument
215 		memcpy(edid, edid_v1_header, 8);  in fix_edid()
219 		b = edid + EDID_STRUCT_DISPLAY;  in fix_edid()
221 		edid[127] += 0x80;  in fix_edid()
225 		b = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fix_edid()
249 			csum += edid[i];  in fix_edid()
251 		edid[127] = 256 - csum;  in fix_edid()
256 static int edid_checksum(unsigned char *edid)  in edid_checksum()  argument
259 	int i, err = 0, fix = check_edid(edid);  in edid_checksum()
262 		fix_edid(edid, fix);  in edid_checksum()
265 		csum += edid[i];  in edid_checksum()
266 		all_null |= edid[i];  in edid_checksum()
277 static int edid_check_header(unsigned char *edid)  in edid_check_header()  argument
279 	int i, err = 1, fix = check_edid(edid);  in edid_check_header()
282 		fix_edid(edid, fix);  in edid_check_header()
285 		if (edid[i] != edid_v1_header[i])  in edid_check_header()
521 			/* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */  in get_std_timing()
606  * @edid: EDID data
613  * This function builds a mode database using the contents of the EDID
616 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize,  in fb_create_modedb()  argument
628 	if (edid == NULL || !edid_checksum(edid) ||  in fb_create_modedb()
629 	    !edid_check_header(edid)) {  in fb_create_modedb()
634 	ver = edid[EDID_STRUCT_VERSION];  in fb_create_modedb()
635 	rev = edid[EDID_STRUCT_REVISION];  in fb_create_modedb()
640 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fb_create_modedb()
653 	block = edid + ESTABLISHED_TIMING_1;  in fb_create_modedb()
657 	block = edid + STD_TIMING_DESCRIPTIONS_START;  in fb_create_modedb()
661 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fb_create_modedb()
668 	/* Yikes, EDID data is totally useless */  in fb_create_modedb()
695 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)  in fb_get_monitor_limits()  argument
700 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fb_get_monitor_limits()
713 			DPRINTK("From EDID\n");  in fb_get_monitor_limits()
724 		modes = fb_create_modedb(edid, &num_modes, specs);  in fb_get_monitor_limits()
776 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)  in get_monspecs()  argument
780 	block = edid + EDID_STRUCT_DISPLAY;  in get_monspecs()
782 	fb_get_monitor_limits(edid, specs);  in get_monspecs()
894 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)  in fb_parse_edid()  argument
899 	if (edid == NULL || var == NULL)  in fb_parse_edid()
902 	if (!(edid_checksum(edid)))  in fb_parse_edid()
905 	if (!(edid_check_header(edid)))  in fb_parse_edid()
908 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fb_parse_edid()
937 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)  in fb_edid_to_monspecs()  argument
942 	if (edid == NULL)  in fb_edid_to_monspecs()
945 	if (!(edid_checksum(edid)))  in fb_edid_to_monspecs()
948 	if (!(edid_check_header(edid)))  in fb_edid_to_monspecs()
953 	specs->version = edid[EDID_STRUCT_VERSION];  in fb_edid_to_monspecs()
954 	specs->revision = edid[EDID_STRUCT_REVISION];  in fb_edid_to_monspecs()
957 	DPRINTK("Display Information (EDID)\n");  in fb_edid_to_monspecs()
959 	DPRINTK("   EDID Version %d.%d\n", (int) specs->version,  in fb_edid_to_monspecs()
962 	parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);  in fb_edid_to_monspecs()
964 	block = edid + DETAILED_TIMING_DESCRIPTIONS_START;  in fb_edid_to_monspecs()
979 	get_monspecs(edid, specs);  in fb_edid_to_monspecs()
981 	specs->modedb = fb_create_modedb(edid, &specs->modedb_len, specs);  in fb_edid_to_monspecs()
1404 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)  in fb_parse_edid()  argument
1408 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)  in fb_edid_to_monspecs()  argument
1487  * We need to ensure that the EDID block is only returned for
1495 	unsigned char *edid = NULL;  in fb_firmware_edid()  local
1504 		edid = edid_info.dummy;  in fb_firmware_edid()
1506 	return edid;  in fb_firmware_edid()