| /* |
| * Copyright (c) 2012 The Chromium OS Authors. |
| * |
| * (C) Copyright 2010 |
| * Petr Stetiar <ynezz@true.cz> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * Contains stolen code from ddcprobe project which is: |
| * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com> |
| */ |
| |
| #ifndef __EDID_H_ |
| #define __EDID_H_ |
| |
| #include <linux/types.h> |
| |
| /* Size of the EDID data */ |
| #define EDID_SIZE 128 |
| #define EDID_EXT_SIZE 256 |
| |
| #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; |
| unsigned char vsync_offset_pulse_width; |
| 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) |
| #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) |
| #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__)); |
| |
| 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]; |
| } __attribute__ ((__packed__)); |
| |
| /** |
| * 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); |
| |
| /** |
| * 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); |
| |
| /** |
| * 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); |
| |
| 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); |
| |
| #endif /* __EDID_H_ */ |