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 #ifndef __EDID_H_ 31 #define __EDID_H_ 32 33 #include <linux/types.h> 34 35 #define GET_BIT(_x, _pos) \ 36 (((_x) >> (_pos)) & 1) 37 #define GET_BITS(_x, _pos_msb, _pos_lsb) \ 38 (((_x) >> (_pos_lsb)) & ((1 << ((_pos_msb) - (_pos_lsb) + 1)) - 1)) 39 40 /* Aspect ratios used in EDID info. */ 41 enum edid_aspect { 42 ASPECT_625 = 0, 43 ASPECT_75, 44 ASPECT_8, 45 ASPECT_5625, 46 }; 47 48 /* Detailed timing information used in EDID v1.x */ 49 struct edid_detailed_timing { 50 unsigned char pixel_clock[2]; 51 #define EDID_DETAILED_TIMING_PIXEL_CLOCK(_x) \ 52 (((((uint32_t)(_x).pixel_clock[1]) << 8) + \ 53 (_x).pixel_clock[0]) * 10000) 54 unsigned char horizontal_active; 55 unsigned char horizontal_blanking; 56 unsigned char horizontal_active_blanking_hi; 57 #define EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(_x) \ 58 ((GET_BITS((_x).horizontal_active_blanking_hi, 7, 4) << 8) + \ 59 (_x).horizontal_active) 60 #define EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(_x) \ 61 ((GET_BITS((_x).horizontal_active_blanking_hi, 3, 0) << 8) + \ 62 (_x).horizontal_blanking) 63 unsigned char vertical_active; 64 unsigned char vertical_blanking; 65 unsigned char vertical_active_blanking_hi; 66 #define EDID_DETAILED_TIMING_VERTICAL_ACTIVE(_x) \ 67 ((GET_BITS((_x).vertical_active_blanking_hi, 7, 4) << 8) + \ 68 (_x).vertical_active) 69 #define EDID_DETAILED_TIMING_VERTICAL_BLANKING(_x) \ 70 ((GET_BITS((_x).vertical_active_blanking_hi, 3, 0) << 8) + \ 71 (_x).vertical_blanking) 72 unsigned char hsync_offset; 73 unsigned char hsync_pulse_width; 74 unsigned char sync_offset_pulse_width; 75 unsigned char hsync_vsync_offset_pulse_width_hi; 76 #define EDID_DETAILED_TIMING_HSYNC_OFFSET(_x) \ 77 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 7, 6) << 8) + \ 78 (_x).hsync_offset) 79 #define EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(_x) \ 80 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 5, 4) << 8) + \ 81 (_x).hsync_pulse_width) 82 #define EDID_DETAILED_TIMING_VSYNC_OFFSET(_x) \ 83 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 3, 2) << 4) + \ 84 GET_BITS((_x).vsync_offset_pulse_width, 7, 4)) 85 #define EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(_x) \ 86 ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 1, 0) << 4) + \ 87 GET_BITS((_x).vsync_offset_pulse_width, 3, 0)) 88 unsigned char himage_size; 89 unsigned char vimage_size; 90 unsigned char himage_vimage_size_hi; 91 #define EDID_DETAILED_TIMING_HIMAGE_SIZE(_x) \ 92 ((GET_BITS((_x).himage_vimage_size_hi, 7, 4) << 8) + (_x).himage_size) 93 #define EDID_DETAILED_TIMING_VIMAGE_SIZE(_x) \ 94 ((GET_BITS((_x).himage_vimage_size_hi, 3, 0) << 8) + (_x).vimage_size) 95 unsigned char hborder; 96 unsigned char vborder; 97 unsigned char flags; 98 #define EDID_DETAILED_TIMING_FLAG_INTERLACED(_x) \ 99 GET_BIT((_x).flags, 7) 100 #define EDID_DETAILED_TIMING_FLAG_STEREO(_x) \ 101 GET_BITS((_x).flags, 6, 5) 102 #define EDID_DETAILED_TIMING_FLAG_DIGITAL_COMPOSITE(_x) \ 103 GET_BITS((_x).flags, 4, 3) 104 #define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \ 105 GET_BITS((_x).flags, 2, 1) 106 #define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \ 107 GET_BIT((_x).flags, 0) 108 } __attribute__ ((__packed__)); 109 110 enum edid_monitor_descriptor_types { 111 EDID_MONITOR_DESCRIPTOR_SERIAL = 0xff, 112 EDID_MONITOR_DESCRIPTOR_ASCII = 0xfe, 113 EDID_MONITOR_DESCRIPTOR_RANGE = 0xfd, 114 EDID_MONITOR_DESCRIPTOR_NAME = 0xfc, 115 }; 116 117 struct edid_monitor_descriptor { 118 uint16_t zero_flag_1; 119 unsigned char zero_flag_2; 120 unsigned char type; 121 unsigned char zero_flag_3; 122 union { 123 char string[13]; 124 struct { 125 unsigned char vertical_min; 126 unsigned char vertical_max; 127 unsigned char horizontal_min; 128 unsigned char horizontal_max; 129 unsigned char pixel_clock_max; 130 unsigned char gtf_data[8]; 131 } range_data; 132 } data; 133 } __attribute__ ((__packed__)); 134 135 struct edid1_info { 136 unsigned char header[8]; 137 unsigned char manufacturer_name[2]; 138 #define EDID1_INFO_MANUFACTURER_NAME_ZERO(_x) \ 139 GET_BIT(((_x).manufacturer_name[0]), 7) 140 #define EDID1_INFO_MANUFACTURER_NAME_CHAR1(_x) \ 141 GET_BITS(((_x).manufacturer_name[0]), 6, 2) 142 #define EDID1_INFO_MANUFACTURER_NAME_CHAR2(_x) \ 143 ((GET_BITS(((_x).manufacturer_name[0]), 1, 0) << 3) + \ 144 GET_BITS(((_x).manufacturer_name[1]), 7, 5)) 145 #define EDID1_INFO_MANUFACTURER_NAME_CHAR3(_x) \ 146 GET_BITS(((_x).manufacturer_name[1]), 4, 0) 147 unsigned char product_code[2]; 148 #define EDID1_INFO_PRODUCT_CODE(_x) \ 149 (((uint16_t)(_x).product_code[1] << 8) + (_x).product_code[0]) 150 unsigned char serial_number[4]; 151 #define EDID1_INFO_SERIAL_NUMBER(_x) \ 152 (((uint32_t)(_x).serial_number[3] << 24) + \ 153 ((_x).serial_number[2] << 16) + ((_x).serial_number[1] << 8) + \ 154 (_x).serial_number[0]) 155 unsigned char week; 156 unsigned char year; 157 unsigned char version; 158 unsigned char revision; 159 unsigned char video_input_definition; 160 #define EDID1_INFO_VIDEO_INPUT_DIGITAL(_x) \ 161 GET_BIT(((_x).video_input_definition), 7) 162 #define EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(_x) \ 163 GET_BITS(((_x).video_input_definition), 6, 5) 164 #define EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(_x) \ 165 GET_BIT(((_x).video_input_definition), 4) 166 #define EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(_x) \ 167 GET_BIT(((_x).video_input_definition), 3) 168 #define EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(_x) \ 169 GET_BIT(((_x).video_input_definition), 2) 170 #define EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(_x) \ 171 GET_BIT(((_x).video_input_definition), 1) 172 #define EDID1_INFO_VIDEO_INPUT_SERRATION_V(_x) \ 173 GET_BIT(((_x).video_input_definition), 0) 174 unsigned char max_size_horizontal; 175 unsigned char max_size_vertical; 176 unsigned char gamma; 177 unsigned char feature_support; 178 #define EDID1_INFO_FEATURE_STANDBY(_x) \ 179 GET_BIT(((_x).feature_support), 7) 180 #define EDID1_INFO_FEATURE_SUSPEND(_x) \ 181 GET_BIT(((_x).feature_support), 6) 182 #define EDID1_INFO_FEATURE_ACTIVE_OFF(_x) \ 183 GET_BIT(((_x).feature_support), 5) 184 #define EDID1_INFO_FEATURE_DISPLAY_TYPE(_x) \ 185 GET_BITS(((_x).feature_support), 4, 3) 186 #define EDID1_INFO_FEATURE_RGB(_x) \ 187 GET_BIT(((_x).feature_support), 2) 188 #define EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(_x) \ 189 GET_BIT(((_x).feature_support), 1) 190 #define EDID1_INFO_FEATURE_DEFAULT_GTF_SUPPORT(_x) \ 191 GET_BIT(((_x).feature_support), 0) 192 unsigned char color_characteristics[10]; 193 unsigned char established_timings[3]; 194 #define EDID1_INFO_ESTABLISHED_TIMING_720X400_70(_x) \ 195 GET_BIT(((_x).established_timings[0]), 7) 196 #define EDID1_INFO_ESTABLISHED_TIMING_720X400_88(_x) \ 197 GET_BIT(((_x).established_timings[0]), 6) 198 #define EDID1_INFO_ESTABLISHED_TIMING_640X480_60(_x) \ 199 GET_BIT(((_x).established_timings[0]), 5) 200 #define EDID1_INFO_ESTABLISHED_TIMING_640X480_67(_x) \ 201 GET_BIT(((_x).established_timings[0]), 4) 202 #define EDID1_INFO_ESTABLISHED_TIMING_640X480_72(_x) \ 203 GET_BIT(((_x).established_timings[0]), 3) 204 #define EDID1_INFO_ESTABLISHED_TIMING_640X480_75(_x) \ 205 GET_BIT(((_x).established_timings[0]), 2) 206 #define EDID1_INFO_ESTABLISHED_TIMING_800X600_56(_x) \ 207 GET_BIT(((_x).established_timings[0]), 1) 208 #define EDID1_INFO_ESTABLISHED_TIMING_800X600_60(_x) \ 209 GET_BIT(((_x).established_timings[0]), 0) 210 #define EDID1_INFO_ESTABLISHED_TIMING_800X600_72(_x) \ 211 GET_BIT(((_x).established_timings[1]), 7) 212 #define EDID1_INFO_ESTABLISHED_TIMING_800X600_75(_x) \ 213 GET_BIT(((_x).established_timings[1]), 6) 214 #define EDID1_INFO_ESTABLISHED_TIMING_832X624_75(_x) \ 215 GET_BIT(((_x).established_timings[1]), 5) 216 #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(_x) \ 217 GET_BIT(((_x).established_timings[1]), 4) 218 #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(_x) \ 219 GET_BIT(((_x).established_timings[1]), 3) 220 #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(_x) \ 221 GET_BIT(((_x).established_timings[1]), 2) 222 #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(_x) \ 223 GET_BIT(((_x).established_timings[1]), 1) 224 #define EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(_x) \ 225 GET_BIT(((_x).established_timings[1]), 0) 226 #define EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(_x) \ 227 GET_BIT(((_x).established_timings[2]), 7) 228 struct { 229 unsigned char xresolution; 230 unsigned char aspect_vfreq; 231 } __attribute__((__packed__)) standard_timings[8]; 232 #define EDID1_INFO_STANDARD_TIMING_XRESOLUTION(_x, _i) \ 233 (((_x).standard_timings[_i]).xresolution) 234 #define EDID1_INFO_STANDARD_TIMING_ASPECT(_x, _i) \ 235 GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 7, 6) 236 #define EDID1_INFO_STANDARD_TIMING_VFREQ(_x, _i) \ 237 GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 5, 0) 238 union { 239 unsigned char timing[72]; 240 struct edid_monitor_descriptor descriptor[4]; 241 } monitor_details; 242 unsigned char extension_flag; 243 unsigned char checksum; 244 } __attribute__ ((__packed__)); 245 246 /** 247 * Print the EDID info. 248 * 249 * @param edid_info The EDID info to be printed 250 */ 251 void edid_print_info(struct edid1_info *edid_info); 252 253 /** 254 * Check the EDID info. 255 * 256 * @param info The EDID info to be checked 257 * @return 0 on valid, or -1 on invalid 258 */ 259 int edid_check_info(struct edid1_info *info); 260 261 /** 262 * Get the horizontal and vertical rate ranges of the monitor. 263 * 264 * @param edid The EDID info 265 * @param hmin Returns the minimum horizontal rate 266 * @param hmax Returns the maxium horizontal rate 267 * @param vmin Returns the minimum vertical rate 268 * @param vmax Returns the maxium vertical rate 269 * @return 0 on success, or -1 on error 270 */ 271 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, 272 unsigned int *hmax, unsigned int *vmin, 273 unsigned int *vmax); 274 275 #endif /* __EDID_H_ */ 276