/* vim: set noet ts=8 sts=8 sw=8 : */ /* * Copyright © 2010 Saleem Abdulrasool . * Copyright © 2010 Genesi USA, Inc. . * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef LINUX_EDID_H #define LINUX_EDID_H /* EDID constants and Structures */ #define EDID_I2C_DDC_DATA_ADDRESS (0x50) #define EDID_BLOCK_SIZE (0x80) #define EDID_MAX_EXTENSIONS (0xfe) static const u8 EDID_HEADER[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; enum edid_extension_type { EDID_EXTENSION_TIMING = 0x01, // Timing Extension EDID_EXTENSION_CEA = 0x02, // Additional Timing Block Data (CEA EDID Timing Extension) EDID_EXTENSION_VTB = 0x10, // Video Timing Block Extension (VTB-EXT) EDID_EXTENSION_EDID_2_0 = 0x20, // EDID 2.0 Extension EDID_EXTENSION_DI = 0x40, // Display Information Extension (DI-EXT) EDID_EXTENSION_LS = 0x50, // Localised String Extension (LS-EXT) EDID_EXTENSION_MI = 0x60, // Microdisplay Interface Extension (MI-EXT) EDID_EXTENSION_DTCDB_1 = 0xa7, // Display Transfer Characteristics Data Block (DTCDB) EDID_EXTENSION_DTCDB_2 = 0xaf, EDID_EXTENSION_DTCDB_3 = 0xbf, EDID_EXTENSION_BLOCK_MAP = 0xf0, // Block Map EDID_EXTENSION_DDDB = 0xff, // Display Device Data Block (DDDB) }; enum edid_display_type { EDID_DISPLAY_TYPE_MONOCHROME, EDID_DISPLAY_TYPE_RGB, EDID_DISPLAY_TYPE_NON_RGB, EDID_DISPLAY_TYPE_UNDEFINED, }; enum edid_aspect_ratio { EDID_ASPECT_RATIO_16_10, EDID_ASPECT_RATIO_4_3, EDID_ASPECT_RATIO_5_4, EDID_ASPECT_RATIO_16_9, }; enum edid_monitor_descriptor_type { EDID_MONITOR_DESCRIPTOR_STANDARD_TIMING_IDENTIFIERS = 0xfa, EDID_MONITOR_DESCRIPTOR_COLOR_POINT = 0xfb, EDID_MONITOR_DESCRIPTOR_MONITOR_NAME = 0xfc, EDID_MONITOR_DESCRIPTOR_MONITOR_RANGE_LIMITS = 0xfd, EDID_MONITOR_DESCRIPTOR_MONITOR_SERIAL_NUMBER = 0xff, }; struct __packed edid_detailed_timing_descriptor { u16 pixel_clock; /* = value * 10000 */ u8 horizontal_active_lo; u8 horizontal_blanking_lo; unsigned horizontal_blanking_hi : 4; unsigned horizontal_active_hi : 4; u8 vertical_active_lo; u8 vertical_blanking_lo; unsigned vertical_blanking_hi : 4; unsigned vertical_active_hi : 4; u8 horizontal_sync_offset_lo; u8 horizontal_sync_pulse_width_lo; unsigned vertical_sync_pulse_width_lo : 4; unsigned vertical_sync_offset_lo : 4; unsigned vertical_sync_pulse_width_hi : 2; unsigned vertical_sync_offset_hi : 2; unsigned horizontal_sync_pulse_width_hi : 2; unsigned horizontal_sync_offset_hi : 2; u8 horizontal_image_size_lo; u8 vertical_image_size_lo; unsigned vertical_image_size_hi : 4; unsigned horizontal_image_size_hi : 4; u8 horizontal_border; u8 vertical_border; u8 flags; }; static inline u16 edid_timing_pixel_clock(const struct edid_detailed_timing_descriptor * const dtb) { return dtb->pixel_clock * 10000; } static inline u16 edid_timing_horizontal_blanking(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->horizontal_blanking_hi << 8) | dtb->horizontal_blanking_lo; } static inline u16 edid_timing_horizontal_active(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->horizontal_active_hi << 8) | dtb->horizontal_active_lo; } static inline u16 edid_timing_vertical_blanking(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->vertical_blanking_hi << 8) | dtb->vertical_blanking_lo; } static inline u16 edid_timing_vertical_active(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->vertical_active_hi << 8) | dtb->vertical_active_lo; } static inline u8 edid_timing_vertical_sync_offset(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->vertical_sync_offset_hi << 4) | dtb->vertical_sync_offset_lo; } static inline u8 edid_timing_vertical_sync_pulse_width(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->vertical_sync_pulse_width_hi << 4) | dtb->vertical_sync_pulse_width_lo; } static inline u8 edid_timing_horizontal_sync_offset(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->horizontal_sync_offset_hi << 4) | dtb->horizontal_sync_offset_lo; } static inline u8 edid_timing_horizontal_sync_pulse_width(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->horizontal_sync_pulse_width_hi << 4) | dtb->horizontal_sync_pulse_width_lo; } static inline u16 edid_timing_horizontal_image_size(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->horizontal_image_size_hi << 8) | dtb->horizontal_image_size_lo; } static inline u16 edid_timing_vertical_image_size(const struct edid_detailed_timing_descriptor * const dtb) { return (dtb->vertical_image_size_hi << 8) | dtb->vertical_image_size_lo; } struct __packed edid_monitor_descriptor { u16 flag0; u8 flag1; u8 tag; u8 flag2; u8 data[13]; }; struct __packed edid_standard_timing_descriptor { u8 horizontal_active_pixels; /* = (value + 31) * 8 */ unsigned refresh_rate : 6; /* = value + 60 */ unsigned image_aspect_ratio : 2; }; struct __packed edid_block0 { /* header information */ u8 header[8]; /* vendor/product identification */ struct __packed { unsigned id2 : 5; unsigned id1 : 5; unsigned id0 : 5; unsigned zero : 1; } manufacturer; u8 product[2]; u8 serial_number[4]; u8 manufacture_week; u8 manufacture_year; /* EDID version */ u8 version; u8 revision; /* basic display parameters and features */ struct __packed { unsigned dfp_1x_vsync_serration : 1; /* VESA DFP 1.x */ unsigned green_video_sync : 1; unsigned composite_sync : 1; unsigned separate_sync : 1; unsigned blank_to_black_setup : 1; unsigned signal_level_standard : 2; unsigned digital : 1; } video_input_definition; u8 maximum_horizontal_image_size; /* cm */ u8 maximum_vertical_image_size; /* cm */ u8 display_transfer_characteristics; /* gamma = (value + 100) / 100 */ struct __packed { unsigned default_gtf : 1; /* generalised timing formula */ unsigned preferred_timing_mode : 1; unsigned standard_default_color_space : 1; unsigned display_type : 2; unsigned active_off : 1; unsigned suspend : 1; unsigned standby : 1; } feature_support; /* color characteristics block */ unsigned green_y_low : 2; unsigned green_x_low : 2; unsigned red_y_low : 2; unsigned red_x_low : 2; unsigned white_y_low : 2; unsigned white_x_low : 2; unsigned blue_y_low : 2; unsigned blue_x_low : 2; u8 red_x; u8 red_y; u8 green_x; u8 green_y; u8 blue_x; u8 blue_y; u8 white_x; u8 white_y; /* established timings */ struct __packed { unsigned timing_800x600_60 : 1; unsigned timing_800x600_56 : 1; unsigned timing_640x480_75 : 1; unsigned timing_640x480_72 : 1; unsigned timing_640x480_67 : 1; unsigned timing_640x480_60 : 1; unsigned timing_720x400_88 : 1; unsigned timing_720x400_70 : 1; unsigned timing_1280x1024_75 : 1; unsigned timing_1024x768_75 : 1; unsigned timing_1024x768_70 : 1; unsigned timing_1024x768_60 : 1; unsigned timing_1024x768_87 : 1; unsigned timing_832x624_75 : 1; unsigned timing_800x600_75 : 1; unsigned timing_800x600_72 : 1; } established_timings; struct __packed { unsigned reserved : 7; unsigned timing_1152x870_75 : 1; } manufacturer_timings; /* standard timing id */ struct edid_standard_timing_descriptor standard_timing_id[8]; /* detailed timing */ union { struct edid_detailed_timing_descriptor detailed_timing[4]; struct edid_monitor_descriptor monitor_descriptor[4]; } detailed_timings; u8 extensions; u8 checksum; }; struct __packed edid_color_characteristics_data { struct { u16 x; u16 y; } red, green, blue, white; }; static inline u16 edid_gamma(const struct edid_block0 * const block0) { return (block0->display_transfer_characteristics + 100) / 100; } static inline struct edid_color_characteristics_data edid_color_characteristics(const struct edid_block0 * const block0) { struct edid_color_characteristics_data characteristics = { .red = { .x = (block0->red_x << 8) | block0->red_x_low, .y = (block0->red_y << 8) | block0->red_y_low, }, .green = { .x = (block0->green_x << 8) | block0->green_x_low, .y = (block0->green_y << 8) | block0->green_y_low, }, .blue = { .x = (block0->blue_x << 8) | block0->blue_x_low, .y = (block0->blue_y << 8) | block0->blue_y_low, }, .white = { .x = (block0->white_x << 8) | block0->white_x_low, .y = (block0->white_y << 8) | block0->white_y_low, }, }; return characteristics; } struct __packed edid_block_map { u8 tag; u8 extension_tag[126]; u8 checksum; }; struct __packed edid_extension { u8 tag; u8 revision; u8 extension_data[125]; u8 checksum; }; static inline bool edid_verify_checksum(const u8 * const block) { u8 checksum = 0; int i; for (i = 0; i < EDID_BLOCK_SIZE; i++) checksum += block[i]; return (checksum == 0); } #endif