include/edid.h

   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_ */