common/edid.c

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  *
   4  * (C) Copyright 2010
   5  * Petr Stetiar <ynezz@true.cz>
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  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.
  14  *
  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.
  19  *
  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,
  23  * MA 02111-1307 USA
  24  *
  25  * Contains stolen code from ddcprobe project which is:
  26  * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
  27  *
  28  */
  29
  30 #include <common.h>
  31 #include <edid.h>
  32 #include <linux/ctype.h>
  33 #include <linux/string.h>
  34
  35 int edid_check_info(struct edid1_info *edid_info)
  36 {
  37         if ((edid_info == NULL) || (edid_info->version == 0))
  38                 return -1;
  39
  40         if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
  41                 return -1;
  42
  43         if (edid_info->version == 0xff && edid_info->revision == 0xff)
  44                 return -1;
  45
  46         return 0;
  47 }
  48
  49 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
  50                     unsigned int *hmax, unsigned int *vmin,
  51                     unsigned int *vmax)
  52 {
  53         int i;
  54         struct edid_monitor_descriptor *monitor;
  55
  56         *hmin = *hmax = *vmin = *vmax = 0;
  57         if (edid_check_info(edid))
  58                 return -1;
  59
  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;
  67                         return 0;
  68                 }
  69         }
  70         return -1;
  71 }
  72
  73 /**
  74  * Snip the tailing whitespace/return of a string.
  75  *
  76  * @param string        The string to be snipped
  77  * @return the snipped string
  78  */
  79 static char *snip(char *string)
  80 {
  81         char *s;
  82
  83         /*
  84          * This is always a 13 character buffer
  85          * and it's not always terminated.
  86          */
  87         string[12] = '\0';
  88         s = &string[strlen(string) - 1];
  89
  90         while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
  91                         *s == '\0'))
  92                 *(s--) = '\0';
  93
  94         return string;
  95 }
  96
  97 /**
  98  * Print an EDID monitor descriptor block
  99  *
 100  * @param monitor       The EDID monitor descriptor block
 101  * @have_timing         Modifies to 1 if the desciptor contains timing info
 102  */
 103 static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
 104                            unsigned int *have_timing)
 105 {
 106         unsigned char *bytes = (unsigned char *)monitor;
 107         struct edid_detailed_timing *timing =
 108                         (struct edid_detailed_timing *)monitor;
 109
 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: "
 124                                "%d MHz\n",
 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);
 130         } else {
 131                 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
 132                 uint32_t h_total, v_total, vfreq;
 133
 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);
 139
 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);
 144                 else
 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);
 148                 *have_timing = 1;
 149         }
 150 }
 151
 152 /**
 153  * Get the manufacturer name from an EDID info.
 154  *
 155  * @param edid_info     The EDID info to be printed
 156  * @param name          Returns the string of the manufacturer name
 157  */
 158 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
 159 {
 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;
 163         name[3] = '\0';
 164 }
 165
 166 void edid_print_info(struct edid1_info *edid_info)
 167 {
 168         int i;
 169         char manufacturer[4];
 170         unsigned int have_timing = 0;
 171         uint32_t serial_number;
 172
 173         if (edid_check_info(edid_info)) {
 174                 printf("Not a valid EDID\n");
 175                 return;
 176         }
 177
 178         printf("EDID version: %d.%d\n",
 179                edid_info->version, edid_info->revision);
 180
 181         printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
 182
 183         edid_get_manufacturer_name(edid_info, manufacturer);
 184         printf("Manufacturer: %s\n", manufacturer);
 185
 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;
 194         }
 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);
 198
 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" : "");
 213
 214         printf("Monitor is %s\n",
 215                EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
 216
 217         printf("Maximum visible display size: %d cm x %d cm\n",
 218                edid_info->max_size_horizontal,
 219                edid_info->max_size_vertical);
 220
 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");
 226
 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");
 262
 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;
 267                 unsigned int x, y;
 268                 unsigned char xres, vfreq;
 269
 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,
 276                                         i)) {
 277                         case ASPECT_625:
 278                                 aspect = 6250;
 279                                 break;
 280                         case ASPECT_75:
 281                                 aspect = 7500;
 282                                 break;
 283                         case ASPECT_8:
 284                                 aspect = 8000;
 285                                 break;
 286                         case ASPECT_5625:
 287                                 aspect = 5625;
 288                                 break;
 289                         }
 290                         x = (xres + 31) * 8;
 291                         y = x * aspect / 10000;
 292                         printf("\t%dx%d%c\t%d Hz\n", x, y,
 293                                x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
 294                         have_timing = 1;
 295                 }
 296         }
 297
 298         /* Detailed timing information. */
 299         for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
 300                         i++) {
 301                 edid_print_dtd(&edid_info->monitor_details.descriptor[i],
 302                                &have_timing);
 303         }
 304
 305         if (!have_timing)
 306                 printf("\tNone\n");
 307 }