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include/edid.h
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/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* * Copyright (c) 2012 The Chromium OS Authors. * * (C) Copyright 2010 * Petr Stetiar <ynezz@true.cz> * |
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* Contains stolen code from ddcprobe project which is: * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com> |
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*/ #ifndef __EDID_H_ #define __EDID_H_ #include <linux/types.h> |
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/* Size of the EDID data */ #define EDID_SIZE 128 |
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#define EDID_EXT_SIZE 256 |
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/* OUI of HDMI vendor specific data block */ #define HDMI_IEEE_OUI 0x000c03 |
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#define GET_BIT(_x, _pos) \ (((_x) >> (_pos)) & 1) #define GET_BITS(_x, _pos_msb, _pos_lsb) \ (((_x) >> (_pos_lsb)) & ((1 << ((_pos_msb) - (_pos_lsb) + 1)) - 1)) /* Aspect ratios used in EDID info. */ enum edid_aspect { ASPECT_625 = 0, ASPECT_75, ASPECT_8, ASPECT_5625, }; /* Detailed timing information used in EDID v1.x */ struct edid_detailed_timing { unsigned char pixel_clock[2]; #define EDID_DETAILED_TIMING_PIXEL_CLOCK(_x) \ (((((uint32_t)(_x).pixel_clock[1]) << 8) + \ (_x).pixel_clock[0]) * 10000) unsigned char horizontal_active; unsigned char horizontal_blanking; unsigned char horizontal_active_blanking_hi; #define EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(_x) \ ((GET_BITS((_x).horizontal_active_blanking_hi, 7, 4) << 8) + \ (_x).horizontal_active) #define EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(_x) \ ((GET_BITS((_x).horizontal_active_blanking_hi, 3, 0) << 8) + \ (_x).horizontal_blanking) unsigned char vertical_active; unsigned char vertical_blanking; unsigned char vertical_active_blanking_hi; #define EDID_DETAILED_TIMING_VERTICAL_ACTIVE(_x) \ ((GET_BITS((_x).vertical_active_blanking_hi, 7, 4) << 8) + \ (_x).vertical_active) #define EDID_DETAILED_TIMING_VERTICAL_BLANKING(_x) \ ((GET_BITS((_x).vertical_active_blanking_hi, 3, 0) << 8) + \ (_x).vertical_blanking) unsigned char hsync_offset; unsigned char hsync_pulse_width; |
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unsigned char vsync_offset_pulse_width; |
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unsigned char hsync_vsync_offset_pulse_width_hi; #define EDID_DETAILED_TIMING_HSYNC_OFFSET(_x) \ ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 7, 6) << 8) + \ (_x).hsync_offset) #define EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(_x) \ ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 5, 4) << 8) + \ (_x).hsync_pulse_width) #define EDID_DETAILED_TIMING_VSYNC_OFFSET(_x) \ ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 3, 2) << 4) + \ GET_BITS((_x).vsync_offset_pulse_width, 7, 4)) #define EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(_x) \ ((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 1, 0) << 4) + \ GET_BITS((_x).vsync_offset_pulse_width, 3, 0)) unsigned char himage_size; unsigned char vimage_size; unsigned char himage_vimage_size_hi; #define EDID_DETAILED_TIMING_HIMAGE_SIZE(_x) \ ((GET_BITS((_x).himage_vimage_size_hi, 7, 4) << 8) + (_x).himage_size) #define EDID_DETAILED_TIMING_VIMAGE_SIZE(_x) \ ((GET_BITS((_x).himage_vimage_size_hi, 3, 0) << 8) + (_x).vimage_size) unsigned char hborder; unsigned char vborder; unsigned char flags; #define EDID_DETAILED_TIMING_FLAG_INTERLACED(_x) \ GET_BIT((_x).flags, 7) #define EDID_DETAILED_TIMING_FLAG_STEREO(_x) \ GET_BITS((_x).flags, 6, 5) #define EDID_DETAILED_TIMING_FLAG_DIGITAL_COMPOSITE(_x) \ GET_BITS((_x).flags, 4, 3) #define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \ GET_BITS((_x).flags, 2, 1) |
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#define EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(_x) \ GET_BIT((_x).flags, 2) #define EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(_x) \ GET_BIT((_x).flags, 1) |
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#define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \ GET_BIT((_x).flags, 0) } __attribute__ ((__packed__)); enum edid_monitor_descriptor_types { EDID_MONITOR_DESCRIPTOR_SERIAL = 0xff, EDID_MONITOR_DESCRIPTOR_ASCII = 0xfe, EDID_MONITOR_DESCRIPTOR_RANGE = 0xfd, EDID_MONITOR_DESCRIPTOR_NAME = 0xfc, }; struct edid_monitor_descriptor { uint16_t zero_flag_1; unsigned char zero_flag_2; unsigned char type; unsigned char zero_flag_3; union { char string[13]; struct { unsigned char vertical_min; unsigned char vertical_max; unsigned char horizontal_min; unsigned char horizontal_max; unsigned char pixel_clock_max; unsigned char gtf_data[8]; } range_data; } data; } __attribute__ ((__packed__)); struct edid1_info { unsigned char header[8]; unsigned char manufacturer_name[2]; #define EDID1_INFO_MANUFACTURER_NAME_ZERO(_x) \ GET_BIT(((_x).manufacturer_name[0]), 7) #define EDID1_INFO_MANUFACTURER_NAME_CHAR1(_x) \ GET_BITS(((_x).manufacturer_name[0]), 6, 2) #define EDID1_INFO_MANUFACTURER_NAME_CHAR2(_x) \ ((GET_BITS(((_x).manufacturer_name[0]), 1, 0) << 3) + \ GET_BITS(((_x).manufacturer_name[1]), 7, 5)) #define EDID1_INFO_MANUFACTURER_NAME_CHAR3(_x) \ GET_BITS(((_x).manufacturer_name[1]), 4, 0) unsigned char product_code[2]; #define EDID1_INFO_PRODUCT_CODE(_x) \ (((uint16_t)(_x).product_code[1] << 8) + (_x).product_code[0]) unsigned char serial_number[4]; #define EDID1_INFO_SERIAL_NUMBER(_x) \ (((uint32_t)(_x).serial_number[3] << 24) + \ ((_x).serial_number[2] << 16) + ((_x).serial_number[1] << 8) + \ (_x).serial_number[0]) unsigned char week; unsigned char year; unsigned char version; unsigned char revision; unsigned char video_input_definition; #define EDID1_INFO_VIDEO_INPUT_DIGITAL(_x) \ GET_BIT(((_x).video_input_definition), 7) #define EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(_x) \ GET_BITS(((_x).video_input_definition), 6, 5) #define EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(_x) \ GET_BIT(((_x).video_input_definition), 4) #define EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(_x) \ GET_BIT(((_x).video_input_definition), 3) #define EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(_x) \ GET_BIT(((_x).video_input_definition), 2) #define EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(_x) \ GET_BIT(((_x).video_input_definition), 1) #define EDID1_INFO_VIDEO_INPUT_SERRATION_V(_x) \ GET_BIT(((_x).video_input_definition), 0) unsigned char max_size_horizontal; unsigned char max_size_vertical; unsigned char gamma; unsigned char feature_support; #define EDID1_INFO_FEATURE_STANDBY(_x) \ GET_BIT(((_x).feature_support), 7) #define EDID1_INFO_FEATURE_SUSPEND(_x) \ GET_BIT(((_x).feature_support), 6) #define EDID1_INFO_FEATURE_ACTIVE_OFF(_x) \ GET_BIT(((_x).feature_support), 5) #define EDID1_INFO_FEATURE_DISPLAY_TYPE(_x) \ GET_BITS(((_x).feature_support), 4, 3) #define EDID1_INFO_FEATURE_RGB(_x) \ GET_BIT(((_x).feature_support), 2) #define EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(_x) \ GET_BIT(((_x).feature_support), 1) #define EDID1_INFO_FEATURE_DEFAULT_GTF_SUPPORT(_x) \ GET_BIT(((_x).feature_support), 0) unsigned char color_characteristics[10]; unsigned char established_timings[3]; #define EDID1_INFO_ESTABLISHED_TIMING_720X400_70(_x) \ GET_BIT(((_x).established_timings[0]), 7) #define EDID1_INFO_ESTABLISHED_TIMING_720X400_88(_x) \ GET_BIT(((_x).established_timings[0]), 6) #define EDID1_INFO_ESTABLISHED_TIMING_640X480_60(_x) \ GET_BIT(((_x).established_timings[0]), 5) #define EDID1_INFO_ESTABLISHED_TIMING_640X480_67(_x) \ GET_BIT(((_x).established_timings[0]), 4) #define EDID1_INFO_ESTABLISHED_TIMING_640X480_72(_x) \ GET_BIT(((_x).established_timings[0]), 3) #define EDID1_INFO_ESTABLISHED_TIMING_640X480_75(_x) \ GET_BIT(((_x).established_timings[0]), 2) #define EDID1_INFO_ESTABLISHED_TIMING_800X600_56(_x) \ GET_BIT(((_x).established_timings[0]), 1) #define EDID1_INFO_ESTABLISHED_TIMING_800X600_60(_x) \ GET_BIT(((_x).established_timings[0]), 0) #define EDID1_INFO_ESTABLISHED_TIMING_800X600_72(_x) \ GET_BIT(((_x).established_timings[1]), 7) #define EDID1_INFO_ESTABLISHED_TIMING_800X600_75(_x) \ GET_BIT(((_x).established_timings[1]), 6) #define EDID1_INFO_ESTABLISHED_TIMING_832X624_75(_x) \ GET_BIT(((_x).established_timings[1]), 5) #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(_x) \ GET_BIT(((_x).established_timings[1]), 4) #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(_x) \ GET_BIT(((_x).established_timings[1]), 3) #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(_x) \ GET_BIT(((_x).established_timings[1]), 2) #define EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(_x) \ GET_BIT(((_x).established_timings[1]), 1) #define EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(_x) \ GET_BIT(((_x).established_timings[1]), 0) #define EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(_x) \ GET_BIT(((_x).established_timings[2]), 7) struct { unsigned char xresolution; unsigned char aspect_vfreq; } __attribute__((__packed__)) standard_timings[8]; #define EDID1_INFO_STANDARD_TIMING_XRESOLUTION(_x, _i) \ (((_x).standard_timings[_i]).xresolution) #define EDID1_INFO_STANDARD_TIMING_ASPECT(_x, _i) \ GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 7, 6) #define EDID1_INFO_STANDARD_TIMING_VFREQ(_x, _i) \ GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 5, 0) union { unsigned char timing[72]; struct edid_monitor_descriptor descriptor[4]; } monitor_details; unsigned char extension_flag; unsigned char checksum; } __attribute__ ((__packed__)); |
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enum edid_cea861_db_types { EDID_CEA861_DB_AUDIO = 0x01, EDID_CEA861_DB_VIDEO = 0x02, EDID_CEA861_DB_VENDOR = 0x03, EDID_CEA861_DB_SPEAKER = 0x04, }; |
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struct edid_cea861_info { unsigned char extension_tag; #define EDID_CEA861_EXTENSION_TAG 0x02 unsigned char revision; unsigned char dtd_offset; unsigned char dtd_count; #define EDID_CEA861_SUPPORTS_UNDERSCAN(_x) \ GET_BIT(((_x).dtd_count), 7) #define EDID_CEA861_SUPPORTS_BASIC_AUDIO(_x) \ GET_BIT(((_x).dtd_count), 6) #define EDID_CEA861_SUPPORTS_YUV444(_x) \ GET_BIT(((_x).dtd_count), 5) #define EDID_CEA861_SUPPORTS_YUV422(_x) \ GET_BIT(((_x).dtd_count), 4) #define EDID_CEA861_DTD_COUNT(_x) \ GET_BITS(((_x).dtd_count), 3, 0) unsigned char data[124]; |
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#define EDID_CEA861_DB_TYPE(_x, offset) \ GET_BITS((_x).data[offset], 7, 5) #define EDID_CEA861_DB_LEN(_x, offset) \ GET_BITS((_x).data[offset], 4, 0) |
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} __attribute__ ((__packed__)); |
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/** * Print the EDID info. * * @param edid_info The EDID info to be printed */ void edid_print_info(struct edid1_info *edid_info); /** * Check the EDID info. * * @param info The EDID info to be checked * @return 0 on valid, or -1 on invalid */ int edid_check_info(struct edid1_info *info); /** |
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* Check checksum of a 128 bytes EDID data block * * @param edid_block EDID block data * * @return 0 on success, or a negative errno on error */ int edid_check_checksum(u8 *edid_block); /** |
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* Get the horizontal and vertical rate ranges of the monitor. * * @param edid The EDID info * @param hmin Returns the minimum horizontal rate * @param hmax Returns the maxium horizontal rate * @param vmin Returns the minimum vertical rate * @param vmax Returns the maxium vertical rate * @return 0 on success, or -1 on error */ int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, unsigned int *hmax, unsigned int *vmin, unsigned int *vmax); |
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struct display_timing; /** * edid_get_timing() - Get basic digital display parameters * * @param buf Buffer containing EDID data * @param buf_size Size of buffer in bytes * @param timing Place to put preferring timing information * @param panel_bits_per_colourp Place to put the number of bits per * colour supported by the panel. This will be set to * -1 if not available * @return 0 if timings are OK, -ve on error */ int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, int *panel_bits_per_colourp); |
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#endif /* __EDID_H_ */ |