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https://github.com/genesi/linux-legacy.git
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b8276b737b
Use a proper edid structure definition rather than indexing into a data blob. This also adds additional helper functions to work with the returned edid data. There is much room for further improvements still. We should simply read the first block, then use that to actually determine the number of blocks we need to read from the device. We cant simply read all the potential blocks as that can be up to 32K of data. Once we are reading all the EDID extensions, we should iterate over the blocks to find the CEA block rather than assuming that the device is sending the CEA block as the first block (especially given that the VESA spec calls for block 1 to be an extension map if there are more than 1 block present).
358 lines
10 KiB
C
358 lines
10 KiB
C
/* vim: set noet ts=8 sts=8 sw=8 : */
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/*
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* Copyright © 2010 Saleem Abdulrasool <compnerd@compnerd.org>.
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* Copyright © 2010 Genesi USA, Inc. <matt@genesi-usa.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LINUX_EDID_H
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#define LINUX_EDID_H
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/* EDID constants and Structures */
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#define EDID_I2C_DDC_DATA_ADDRESS (0x50)
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#define EDID_BLOCK_SIZE (0x80)
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#define EDID_MAX_EXTENSIONS (0xfe)
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#define EDID_MAGIC (0x00ffffffffffff00)
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enum edid_extension_type {
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EDID_EXTENSION_TIMING = 0x01, // Timing Extension
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EDID_EXTENSION_CEA = 0x02, // Additional Timing Block Data (CEA EDID Timing Extension)
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EDID_EXTENSION_VTB = 0x10, // Video Timing Block Extension (VTB-EXT)
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EDID_EXTENSION_EDID_2_0 = 0x20, // EDID 2.0 Extension
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EDID_EXTENSION_DI = 0x40, // Display Information Extension (DI-EXT)
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EDID_EXTENSION_LS = 0x50, // Localised String Extension (LS-EXT)
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EDID_EXTENSION_MI = 0x60, // Microdisplay Interface Extension (MI-EXT)
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EDID_EXTENSION_DTCDB_1 = 0xa7, // Display Transfer Characteristics Data Block (DTCDB)
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EDID_EXTENSION_DTCDB_2 = 0xaf,
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EDID_EXTENSION_DTCDB_3 = 0xbf,
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EDID_EXTENSION_BLOCK_MAP = 0xf0, // Block Map
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EDID_EXTENSION_DDDB = 0xff, // Display Device Data Block (DDDB)
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};
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enum edid_display_type {
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EDID_DISPLAY_TYPE_MONOCHROME,
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EDID_DISPLAY_TYPE_RGB,
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EDID_DISPLAY_TYPE_NON_RGB,
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EDID_DISPLAY_TYPE_UNDEFINED,
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};
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enum edid_aspect_ratio {
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EDID_ASPECT_RATIO_16_10,
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EDID_ASPECT_RATIO_4_3,
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EDID_ASPECT_RATIO_5_4,
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EDID_ASPECT_RATIO_16_9,
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};
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enum edid_monitor_descriptor_type {
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EDID_MONITOR_DESCRIPTOR_STANDARD_TIMING_IDENTIFIERS = 0xfa,
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EDID_MONITOR_DESCRIPTOR_COLOR_POINT = 0xfb,
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EDID_MONITOR_DESCRIPTOR_MONITOR_NAME = 0xfc,
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EDID_MONITOR_DESCRIPTOR_MONITOR_RANGE_LIMITS = 0xfd,
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EDID_MONITOR_DESCRIPTOR_MONITOR_SERIAL_NUMBER = 0xff,
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};
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struct __packed edid_detailed_timing_descriptor {
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u16 pixel_clock; /* = value * 10000 */
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u8 horizontal_active_lo;
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u8 horizontal_blanking_lo;
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unsigned horizontal_blanking_hi : 4;
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unsigned horizontal_active_hi : 4;
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u8 vertical_active_lo;
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u8 vertical_blanking_lo;
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unsigned vertical_blanking_hi : 4;
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unsigned vertical_active_hi : 4;
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u8 horizontal_sync_offset_lo;
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u8 horizontal_sync_pulse_width_lo;
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unsigned vertical_sync_pulse_width_lo : 4;
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unsigned vertical_sync_offset_lo : 4;
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unsigned vertical_sync_pulse_width_hi : 2;
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unsigned vertical_sync_offset_hi : 2;
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unsigned horizontal_sync_pulse_width_hi : 2;
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unsigned horizontal_sync_offset_hi : 2;
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u8 horizontal_image_size_lo;
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u8 vertical_image_size_lo;
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unsigned vertical_image_size_hi : 4;
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unsigned horizontal_image_size_hi : 4;
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u8 horizontal_border;
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u8 vertical_border;
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u8 flags;
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};
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static inline u16
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edid_timing_pixel_clock(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return dtb->pixel_clock * 1000;
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}
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static inline u16
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edid_timing_horizontal_blanking(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->horizontal_blanking_hi << 8) | dtb->horizontal_blanking_lo;
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}
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static inline u16
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edid_timing_horizontal_active(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->horizontal_active_hi << 8) | dtb->horizontal_active_lo;
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}
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static inline u16
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edid_timing_vertical_blanking(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->vertical_blanking_hi << 8) | dtb->vertical_blanking_lo;
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}
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static inline u16
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edid_timing_vertical_active(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->vertical_active_hi << 8) | dtb->vertical_active_lo;
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}
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static inline u8
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edid_timing_vertical_sync_offset(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->vertical_sync_offset_hi << 4) | dtb->vertical_sync_offset_lo;
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}
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static inline u8
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edid_timing_vertical_sync_pulse_width(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->vertical_sync_pulse_width_hi << 4) | dtb->vertical_sync_pulse_width_lo;
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}
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static inline u8
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edid_timing_horizontal_sync_offset(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->horizontal_sync_offset_hi << 4) | dtb->horizontal_sync_offset_lo;
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}
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static inline u8
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edid_timing_horizontal_sync_pulse_width(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->horizontal_sync_pulse_width_hi << 4) | dtb->horizontal_sync_pulse_width_lo;
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}
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static inline u16
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edid_timing_horizontal_image_size(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->horizontal_image_size_hi << 8) | dtb->horizontal_image_size_lo;
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}
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static inline u16
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edid_timing_vertical_image_size(const struct edid_detailed_timing_descriptor * const dtb)
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{
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return (dtb->vertical_image_size_hi << 8) | dtb->vertical_image_size_lo;
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}
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struct __packed edid_monitor_descriptor {
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u16 flag0;
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u8 flag1;
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u8 data_type_tag;
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u8 flag2;
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u8 data[13];
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};
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struct __packed edid_block0 {
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/* header information */
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u8 header[8];
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/* vendor/product identification */
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struct {
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unsigned id0 : 5;
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unsigned id1 : 5;
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unsigned id2 : 5;
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unsigned zero : 1;
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} manufacturer;
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u8 product[2];
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u8 serial_number[4];
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u8 manufacture_week;
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u8 manufacture_year;
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/* EDID version */
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u8 version;
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u8 revision;
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/* basic display parameters and features */
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struct {
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unsigned dfp_1x_vsync_serration : 1; /* VESA DFP 1.x */
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unsigned green_video_sync : 1;
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unsigned composite_sync : 1;
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unsigned separate_sync : 1;
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unsigned blank_to_black_setup : 1;
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unsigned signal_level_standard : 2;
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unsigned digital : 1;
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} video_input_definition;
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u8 maximum_horizontal_image_size; /* cm */
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u8 maximum_vertical_image_size; /* cm */
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u8 display_transfer_characteristics; /* gamma = (value + 100) / 100 */
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struct {
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unsigned default_gtf : 1; /* generalised timing formula */
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unsigned preferred_timing_mode : 1;
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unsigned standard_default_color_space : 1;
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unsigned display_type : 2;
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unsigned active_off : 1;
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unsigned suspend : 1;
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unsigned standby : 1;
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} feature_support;
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/* color characteristics block */
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unsigned green_y_low : 2;
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unsigned green_x_low : 2;
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unsigned red_y_low : 2;
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unsigned red_x_low : 2;
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unsigned white_y_low : 2;
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unsigned white_x_low : 2;
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unsigned blue_y_low : 2;
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unsigned blue_x_low : 2;
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u8 red_x;
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u8 red_y;
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u8 green_x;
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u8 green_y;
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u8 blue_x;
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u8 blue_y;
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u8 white_x;
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u8 white_y;
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/* established timings */
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struct {
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unsigned timing_800x600_60 : 1;
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unsigned timing_800x600_56 : 1;
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unsigned timing_640x480_75 : 1;
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unsigned timing_640x480_72 : 1;
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unsigned timing_640x480_67 : 1;
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unsigned timing_640x480_60 : 1;
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unsigned timing_720x400_88 : 1;
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unsigned timing_720x400_70 : 1;
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unsigned timing_1280x1024_75 : 1;
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unsigned timing_1024x768_75 : 1;
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unsigned timing_1024x768_60 : 1;
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unsigned timing_1024x768_87 : 1;
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unsigned timing_832x624_75 : 1;
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unsigned timing_800x600_75 : 1;
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unsigned timing_800x600_72 : 1;
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} established_timings;
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struct {
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unsigned reserved : 7;
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unsigned timing_1152x870_75 : 1;
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} manufacturer_timings;
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/* standard timing id */
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struct {
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u8 horizontal_active_pixels; /* = (value + 31) * 8 */
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unsigned refresh_rate : 6; /* = value + 60 */
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unsigned image_aspect_ratio : 2;
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} standard_timing_identification[8];
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/* detailed timing */
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union {
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struct edid_detailed_timing_descriptor detailed_timing[4];
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struct edid_monitor_descriptor monitor_descriptor[4];
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} detailed_timings;
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u8 extensions;
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u8 checksum;
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};
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struct __packed edid_color_characteristics_data {
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struct {
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u16 x;
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u16 y;
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} red, green, blue, white;
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};
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static inline u16 edid_gamma(const struct edid_block0 * const block0)
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{
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return (block0->display_transfer_characteristics + 100) / 100;
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}
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static inline struct edid_color_characteristics_data
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edid_color_characteristics(const struct edid_block0 * const block0)
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{
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struct edid_color_characteristics_data characteristics = {
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.red = {
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.x = (block0->red_x << 8) | block0->red_x_low,
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.y = (block0->red_y << 8) | block0->red_y_low,
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},
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.green = {
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.x = (block0->green_x << 8) | block0->green_x_low,
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.y = (block0->green_y << 8) | block0->green_y_low,
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},
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.blue = {
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.x = (block0->blue_x << 8) | block0->blue_x_low,
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.y = (block0->blue_y << 8) | block0->blue_y_low,
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},
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.white = {
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.x = (block0->white_x << 8) | block0->white_x_low,
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.y = (block0->white_y << 8) | block0->white_y_low,
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},
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};
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return characteristics;
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}
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struct __packed edid_block_map {
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u8 tag;
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u8 extension_tag[126];
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u8 checksum;
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};
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struct __packed edid_extension {
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u8 tag;
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u8 revision;
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u8 extension_data[125];
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u8 checksum;
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};
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#endif
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