2 * Copyright (c) 2012 The Chromium OS Authors.
5 * Petr Stetiar <ynezz@true.cz>
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 * Contains stolen code from ddcprobe project which is:
26 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
32 #include <linux/ctype.h>
33 #include <linux/string.h>
35 int edid_check_info(struct edid1_info
*edid_info
)
37 if ((edid_info
== NULL
) || (edid_info
->version
== 0))
40 if (memcmp(edid_info
->header
, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
43 if (edid_info
->version
== 0xff && edid_info
->revision
== 0xff)
49 int edid_get_ranges(struct edid1_info
*edid
, unsigned int *hmin
,
50 unsigned int *hmax
, unsigned int *vmin
,
54 struct edid_monitor_descriptor
*monitor
;
56 *hmin
= *hmax
= *vmin
= *vmax
= 0;
57 if (edid_check_info(edid
))
60 for (i
= 0; i
< ARRAY_SIZE(edid
->monitor_details
.descriptor
); i
++) {
61 monitor
= &edid
->monitor_details
.descriptor
[i
];
62 if (monitor
->type
== EDID_MONITOR_DESCRIPTOR_RANGE
) {
63 *hmin
= monitor
->data
.range_data
.horizontal_min
;
64 *hmax
= monitor
->data
.range_data
.horizontal_max
;
65 *vmin
= monitor
->data
.range_data
.vertical_min
;
66 *vmax
= monitor
->data
.range_data
.vertical_max
;
74 * Snip the tailing whitespace/return of a string.
76 * @param string The string to be snipped
77 * @return the snipped string
79 static char *snip(char *string
)
84 * This is always a 13 character buffer
85 * and it's not always terminated.
88 s
= &string
[strlen(string
) - 1];
90 while (s
>= string
&& (isspace(*s
) || *s
== '\n' || *s
== '\r' ||
98 * Print an EDID monitor descriptor block
100 * @param monitor The EDID monitor descriptor block
101 * @have_timing Modifies to 1 if the desciptor contains timing info
103 static void edid_print_dtd(struct edid_monitor_descriptor
*monitor
,
104 unsigned int *have_timing
)
106 unsigned char *bytes
= (unsigned char *)monitor
;
107 struct edid_detailed_timing
*timing
=
108 (struct edid_detailed_timing
*)monitor
;
110 if (bytes
[0] == 0 && bytes
[1] == 0) {
111 if (monitor
->type
== EDID_MONITOR_DESCRIPTOR_SERIAL
)
112 printf("Monitor serial number: %s\n",
113 snip(monitor
->data
.string
));
114 else if (monitor
->type
== EDID_MONITOR_DESCRIPTOR_ASCII
)
115 printf("Monitor ID: %s\n",
116 snip(monitor
->data
.string
));
117 else if (monitor
->type
== EDID_MONITOR_DESCRIPTOR_NAME
)
118 printf("Monitor name: %s\n",
119 snip(monitor
->data
.string
));
120 else if (monitor
->type
== EDID_MONITOR_DESCRIPTOR_RANGE
)
121 printf("Monitor range limits, horizontal sync: "
122 "%d-%d kHz, vertical refresh: "
123 "%d-%d Hz, max pixel clock: "
125 monitor
->data
.range_data
.horizontal_min
,
126 monitor
->data
.range_data
.horizontal_max
,
127 monitor
->data
.range_data
.vertical_min
,
128 monitor
->data
.range_data
.vertical_max
,
129 monitor
->data
.range_data
.pixel_clock_max
* 10);
131 uint32_t pixclock
, h_active
, h_blanking
, v_active
, v_blanking
;
132 uint32_t h_total
, v_total
, vfreq
;
134 pixclock
= EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing
);
135 h_active
= EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing
);
136 h_blanking
= EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing
);
137 v_active
= EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing
);
138 v_blanking
= EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing
);
140 h_total
= h_active
+ h_blanking
;
141 v_total
= v_active
+ v_blanking
;
142 if (v_total
* h_total
)
143 vfreq
= pixclock
/ (v_total
* h_total
);
145 vfreq
= 1; /* Error case */
146 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active
,
147 v_active
, h_active
> 1000 ? ' ' : '\t', vfreq
);
153 * Get the manufacturer name from an EDID info.
155 * @param edid_info The EDID info to be printed
156 * @param name Returns the string of the manufacturer name
158 static void edid_get_manufacturer_name(struct edid1_info
*edid
, char *name
)
160 name
[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid
) + 'A' - 1;
161 name
[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid
) + 'A' - 1;
162 name
[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid
) + 'A' - 1;
166 void edid_print_info(struct edid1_info
*edid_info
)
169 char manufacturer
[4];
170 unsigned int have_timing
= 0;
171 uint32_t serial_number
;
173 if (edid_check_info(edid_info
)) {
174 printf("Not a valid EDID\n");
178 printf("EDID version: %d.%d\n",
179 edid_info
->version
, edid_info
->revision
);
181 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info
));
183 edid_get_manufacturer_name(edid_info
, manufacturer
);
184 printf("Manufacturer: %s\n", manufacturer
);
186 serial_number
= EDID1_INFO_SERIAL_NUMBER(*edid_info
);
187 if (serial_number
!= 0xffffffff) {
188 if (strcmp(manufacturer
, "MAG") == 0)
189 serial_number
-= 0x7000000;
190 if (strcmp(manufacturer
, "OQI") == 0)
191 serial_number
-= 456150000;
192 if (strcmp(manufacturer
, "VSC") == 0)
193 serial_number
-= 640000000;
195 printf("Serial number: %08x\n", serial_number
);
196 printf("Manufactured in week: %d year: %d\n",
197 edid_info
->week
, edid_info
->year
+ 1990);
199 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
200 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info
) ?
201 "digital signal, " : "analog signal, ",
202 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info
),
203 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info
) ?
204 ", blank to black" : "",
205 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info
) ?
206 ", separate sync" : "",
207 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info
) ?
208 ", composite sync" : "",
209 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info
) ?
210 ", sync on green" : "",
211 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info
) ?
212 ", serration v" : "");
214 printf("Monitor is %s\n",
215 EDID1_INFO_FEATURE_RGB(*edid_info
) ? "RGB" : "non-RGB");
217 printf("Maximum visible display size: %d cm x %d cm\n",
218 edid_info
->max_size_horizontal
,
219 edid_info
->max_size_vertical
);
221 printf("Power management features: %s%s, %s%s, %s%s\n",
222 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info
) ?
223 "" : "no ", "active off",
224 EDID1_INFO_FEATURE_SUSPEND(*edid_info
) ? "" : "no ", "suspend",
225 EDID1_INFO_FEATURE_STANDBY(*edid_info
) ? "" : "no ", "standby");
227 printf("Estabilished timings:\n");
228 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info
))
229 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
230 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info
))
231 printf("\t720x400\t\t88 Hz (XGA2)\n");
232 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info
))
233 printf("\t640x480\t\t60 Hz (VGA)\n");
234 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info
))
235 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
236 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info
))
237 printf("\t640x480\t\t72 Hz (VESA)\n");
238 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info
))
239 printf("\t640x480\t\t75 Hz (VESA)\n");
240 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info
))
241 printf("\t800x600\t\t56 Hz (VESA)\n");
242 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info
))
243 printf("\t800x600\t\t60 Hz (VESA)\n");
244 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info
))
245 printf("\t800x600\t\t72 Hz (VESA)\n");
246 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info
))
247 printf("\t800x600\t\t75 Hz (VESA)\n");
248 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info
))
249 printf("\t832x624\t\t75 Hz (Mac II)\n");
250 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info
))
251 printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
252 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info
))
253 printf("\t1024x768\t60 Hz (VESA)\n");
254 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info
))
255 printf("\t1024x768\t70 Hz (VESA)\n");
256 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info
))
257 printf("\t1024x768\t75 Hz (VESA)\n");
258 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info
))
259 printf("\t1280x1024\t75 (VESA)\n");
260 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info
))
261 printf("\t1152x870\t75 (Mac II)\n");
263 /* Standard timings. */
264 printf("Standard timings:\n");
265 for (i
= 0; i
< ARRAY_SIZE(edid_info
->standard_timings
); i
++) {
266 unsigned int aspect
= 10000;
268 unsigned char xres
, vfreq
;
270 xres
= EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info
, i
);
271 vfreq
= EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info
, i
);
272 if ((xres
!= vfreq
) ||
273 ((xres
!= 0) && (xres
!= 1)) ||
274 ((vfreq
!= 0) && (vfreq
!= 1))) {
275 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info
,
291 y
= x
* aspect
/ 10000;
292 printf("\t%dx%d%c\t%d Hz\n", x
, y
,
293 x
> 1000 ? ' ' : '\t', (vfreq
& 0x3f) + 60);
298 /* Detailed timing information. */
299 for (i
= 0; i
< ARRAY_SIZE(edid_info
->monitor_details
.descriptor
);
301 edid_print_dtd(&edid_info
->monitor_details
.descriptor
[i
],