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Diffstat (limited to 'include/edid.h')
| -rw-r--r-- | include/edid.h | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/include/edid.h b/include/edid.h new file mode 100644 index 0000000..2562733 --- /dev/null +++ b/include/edid.h @@ -0,0 +1,345 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2012 The Chromium OS Authors. + * + * (C) Copyright 2010 + * Petr Stetiar <ynezz@true.cz> + * + * 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 + +/* OUI of HDMI vendor specific data block */ +#define HDMI_IEEE_OUI 0x000c03 + +#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__)); + +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, +}; + +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]; +#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) +} __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_validate() - Get basic digital display parameters with + * mode selection callback + * + * @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 + * @param mode_valid Callback validating mode, returning true is mode is + * supported, false otherwise. + * @parem valid_priv Pointer to private data for mode_valid callback + * @return 0 if timings are OK, -ve on error + */ +int edid_get_timing_validate(u8 *buf, int buf_size, + struct display_timing *timing, + int *panel_bits_per_colourp, + bool (*mode_valid)(void *priv, + const struct display_timing *timing), + void *mode_valid_priv); + +/** + * 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_ */ |