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This implements a library for accessing EDID data from an LCD panel. This is used to obtain information about the panel such as its resolution and type. This is a tidied-up version of the original code pulled from https://github.com/ynezz/u-boot-edid. The changes we made are: - removed bit fields in the struct; - removed endianness cases in the struct; - fixed some wrong definitions; - fixed to fit 80 columns; - fixed some code styles. Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
276 lines
9.9 KiB
C
276 lines
9.9 KiB
C
/*
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* Copyright (c) 2012 The Chromium OS Authors.
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*
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* (C) Copyright 2010
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* Petr Stetiar <ynezz@true.cz>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* Contains stolen code from ddcprobe project which is:
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* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
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*
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*/
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#ifndef __EDID_H_
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#define __EDID_H_
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#include <linux/types.h>
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#define GET_BIT(_x, _pos) \
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(((_x) >> (_pos)) & 1)
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#define GET_BITS(_x, _pos_msb, _pos_lsb) \
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(((_x) >> (_pos_lsb)) & ((1 << ((_pos_msb) - (_pos_lsb) + 1)) - 1))
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/* Aspect ratios used in EDID info. */
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enum edid_aspect {
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ASPECT_625 = 0,
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ASPECT_75,
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ASPECT_8,
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ASPECT_5625,
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};
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/* Detailed timing information used in EDID v1.x */
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struct edid_detailed_timing {
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unsigned char pixel_clock[2];
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#define EDID_DETAILED_TIMING_PIXEL_CLOCK(_x) \
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(((((uint32_t)(_x).pixel_clock[1]) << 8) + \
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(_x).pixel_clock[0]) * 10000)
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unsigned char horizontal_active;
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unsigned char horizontal_blanking;
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unsigned char horizontal_active_blanking_hi;
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#define EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(_x) \
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((GET_BITS((_x).horizontal_active_blanking_hi, 7, 4) << 8) + \
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(_x).horizontal_active)
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#define EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(_x) \
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((GET_BITS((_x).horizontal_active_blanking_hi, 3, 0) << 8) + \
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(_x).horizontal_blanking)
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unsigned char vertical_active;
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unsigned char vertical_blanking;
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unsigned char vertical_active_blanking_hi;
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#define EDID_DETAILED_TIMING_VERTICAL_ACTIVE(_x) \
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((GET_BITS((_x).vertical_active_blanking_hi, 7, 4) << 8) + \
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(_x).vertical_active)
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#define EDID_DETAILED_TIMING_VERTICAL_BLANKING(_x) \
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((GET_BITS((_x).vertical_active_blanking_hi, 3, 0) << 8) + \
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(_x).vertical_blanking)
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unsigned char hsync_offset;
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unsigned char hsync_pulse_width;
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unsigned char sync_offset_pulse_width;
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unsigned char hsync_vsync_offset_pulse_width_hi;
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#define EDID_DETAILED_TIMING_HSYNC_OFFSET(_x) \
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((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 7, 6) << 8) + \
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(_x).hsync_offset)
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#define EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(_x) \
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((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 5, 4) << 8) + \
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(_x).hsync_pulse_width)
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#define EDID_DETAILED_TIMING_VSYNC_OFFSET(_x) \
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((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 3, 2) << 4) + \
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GET_BITS((_x).vsync_offset_pulse_width, 7, 4))
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#define EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(_x) \
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((GET_BITS((_x).hsync_vsync_offset_pulse_width_hi, 1, 0) << 4) + \
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GET_BITS((_x).vsync_offset_pulse_width, 3, 0))
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unsigned char himage_size;
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unsigned char vimage_size;
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unsigned char himage_vimage_size_hi;
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#define EDID_DETAILED_TIMING_HIMAGE_SIZE(_x) \
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((GET_BITS((_x).himage_vimage_size_hi, 7, 4) << 8) + (_x).himage_size)
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#define EDID_DETAILED_TIMING_VIMAGE_SIZE(_x) \
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((GET_BITS((_x).himage_vimage_size_hi, 3, 0) << 8) + (_x).vimage_size)
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unsigned char hborder;
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unsigned char vborder;
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unsigned char flags;
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#define EDID_DETAILED_TIMING_FLAG_INTERLACED(_x) \
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GET_BIT((_x).flags, 7)
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#define EDID_DETAILED_TIMING_FLAG_STEREO(_x) \
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GET_BITS((_x).flags, 6, 5)
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#define EDID_DETAILED_TIMING_FLAG_DIGITAL_COMPOSITE(_x) \
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GET_BITS((_x).flags, 4, 3)
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#define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \
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GET_BITS((_x).flags, 2, 1)
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#define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \
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GET_BIT((_x).flags, 0)
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} __attribute__ ((__packed__));
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enum edid_monitor_descriptor_types {
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EDID_MONITOR_DESCRIPTOR_SERIAL = 0xff,
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EDID_MONITOR_DESCRIPTOR_ASCII = 0xfe,
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EDID_MONITOR_DESCRIPTOR_RANGE = 0xfd,
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EDID_MONITOR_DESCRIPTOR_NAME = 0xfc,
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};
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struct edid_monitor_descriptor {
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uint16_t zero_flag_1;
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unsigned char zero_flag_2;
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unsigned char type;
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unsigned char zero_flag_3;
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union {
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char string[13];
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struct {
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unsigned char vertical_min;
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unsigned char vertical_max;
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unsigned char horizontal_min;
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unsigned char horizontal_max;
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unsigned char pixel_clock_max;
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unsigned char gtf_data[8];
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} range_data;
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} data;
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} __attribute__ ((__packed__));
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struct edid1_info {
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unsigned char header[8];
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unsigned char manufacturer_name[2];
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#define EDID1_INFO_MANUFACTURER_NAME_ZERO(_x) \
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GET_BIT(((_x).manufacturer_name[0]), 7)
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#define EDID1_INFO_MANUFACTURER_NAME_CHAR1(_x) \
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GET_BITS(((_x).manufacturer_name[0]), 6, 2)
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#define EDID1_INFO_MANUFACTURER_NAME_CHAR2(_x) \
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((GET_BITS(((_x).manufacturer_name[0]), 1, 0) << 3) + \
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GET_BITS(((_x).manufacturer_name[1]), 7, 5))
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#define EDID1_INFO_MANUFACTURER_NAME_CHAR3(_x) \
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GET_BITS(((_x).manufacturer_name[1]), 4, 0)
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unsigned char product_code[2];
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#define EDID1_INFO_PRODUCT_CODE(_x) \
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(((uint16_t)(_x).product_code[1] << 8) + (_x).product_code[0])
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unsigned char serial_number[4];
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#define EDID1_INFO_SERIAL_NUMBER(_x) \
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(((uint32_t)(_x).serial_number[3] << 24) + \
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((_x).serial_number[2] << 16) + ((_x).serial_number[1] << 8) + \
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(_x).serial_number[0])
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unsigned char week;
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unsigned char year;
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unsigned char version;
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unsigned char revision;
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unsigned char video_input_definition;
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#define EDID1_INFO_VIDEO_INPUT_DIGITAL(_x) \
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GET_BIT(((_x).video_input_definition), 7)
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#define EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(_x) \
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GET_BITS(((_x).video_input_definition), 6, 5)
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#define EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(_x) \
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GET_BIT(((_x).video_input_definition), 4)
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#define EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(_x) \
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GET_BIT(((_x).video_input_definition), 3)
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#define EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(_x) \
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GET_BIT(((_x).video_input_definition), 2)
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#define EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(_x) \
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GET_BIT(((_x).video_input_definition), 1)
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#define EDID1_INFO_VIDEO_INPUT_SERRATION_V(_x) \
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GET_BIT(((_x).video_input_definition), 0)
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unsigned char max_size_horizontal;
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unsigned char max_size_vertical;
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unsigned char gamma;
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unsigned char feature_support;
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#define EDID1_INFO_FEATURE_STANDBY(_x) \
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GET_BIT(((_x).feature_support), 7)
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#define EDID1_INFO_FEATURE_SUSPEND(_x) \
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GET_BIT(((_x).feature_support), 6)
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#define EDID1_INFO_FEATURE_ACTIVE_OFF(_x) \
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GET_BIT(((_x).feature_support), 5)
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#define EDID1_INFO_FEATURE_DISPLAY_TYPE(_x) \
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GET_BITS(((_x).feature_support), 4, 3)
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#define EDID1_INFO_FEATURE_RGB(_x) \
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GET_BIT(((_x).feature_support), 2)
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#define EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(_x) \
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GET_BIT(((_x).feature_support), 1)
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#define EDID1_INFO_FEATURE_DEFAULT_GTF_SUPPORT(_x) \
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GET_BIT(((_x).feature_support), 0)
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unsigned char color_characteristics[10];
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unsigned char established_timings[3];
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#define EDID1_INFO_ESTABLISHED_TIMING_720X400_70(_x) \
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GET_BIT(((_x).established_timings[0]), 7)
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#define EDID1_INFO_ESTABLISHED_TIMING_720X400_88(_x) \
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GET_BIT(((_x).established_timings[0]), 6)
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#define EDID1_INFO_ESTABLISHED_TIMING_640X480_60(_x) \
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GET_BIT(((_x).established_timings[0]), 5)
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#define EDID1_INFO_ESTABLISHED_TIMING_640X480_67(_x) \
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GET_BIT(((_x).established_timings[0]), 4)
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#define EDID1_INFO_ESTABLISHED_TIMING_640X480_72(_x) \
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GET_BIT(((_x).established_timings[0]), 3)
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#define EDID1_INFO_ESTABLISHED_TIMING_640X480_75(_x) \
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GET_BIT(((_x).established_timings[0]), 2)
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#define EDID1_INFO_ESTABLISHED_TIMING_800X600_56(_x) \
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GET_BIT(((_x).established_timings[0]), 1)
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#define EDID1_INFO_ESTABLISHED_TIMING_800X600_60(_x) \
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GET_BIT(((_x).established_timings[0]), 0)
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#define EDID1_INFO_ESTABLISHED_TIMING_800X600_72(_x) \
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GET_BIT(((_x).established_timings[1]), 7)
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#define EDID1_INFO_ESTABLISHED_TIMING_800X600_75(_x) \
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GET_BIT(((_x).established_timings[1]), 6)
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#define EDID1_INFO_ESTABLISHED_TIMING_832X624_75(_x) \
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GET_BIT(((_x).established_timings[1]), 5)
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#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(_x) \
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GET_BIT(((_x).established_timings[1]), 4)
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#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(_x) \
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GET_BIT(((_x).established_timings[1]), 3)
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#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(_x) \
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GET_BIT(((_x).established_timings[1]), 2)
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#define EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(_x) \
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GET_BIT(((_x).established_timings[1]), 1)
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#define EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(_x) \
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GET_BIT(((_x).established_timings[1]), 0)
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#define EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(_x) \
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GET_BIT(((_x).established_timings[2]), 7)
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struct {
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unsigned char xresolution;
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unsigned char aspect_vfreq;
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} __attribute__((__packed__)) standard_timings[8];
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#define EDID1_INFO_STANDARD_TIMING_XRESOLUTION(_x, _i) \
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(((_x).standard_timings[_i]).xresolution)
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#define EDID1_INFO_STANDARD_TIMING_ASPECT(_x, _i) \
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GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 7, 6)
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#define EDID1_INFO_STANDARD_TIMING_VFREQ(_x, _i) \
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GET_BITS(((_x).standard_timings[_i].aspect_vfreq), 5, 0)
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union {
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unsigned char timing[72];
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struct edid_monitor_descriptor descriptor[4];
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} monitor_details;
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unsigned char extension_flag;
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unsigned char checksum;
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} __attribute__ ((__packed__));
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/**
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* Print the EDID info.
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*
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* @param edid_info The EDID info to be printed
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*/
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void edid_print_info(struct edid1_info *edid_info);
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/**
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* Check the EDID info.
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*
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* @param info The EDID info to be checked
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* @return 0 on valid, or -1 on invalid
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*/
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int edid_check_info(struct edid1_info *info);
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/**
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* Get the horizontal and vertical rate ranges of the monitor.
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*
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* @param edid The EDID info
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* @param hmin Returns the minimum horizontal rate
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* @param hmax Returns the maxium horizontal rate
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* @param vmin Returns the minimum vertical rate
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* @param vmax Returns the maxium vertical rate
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* @return 0 on success, or -1 on error
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*/
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int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
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unsigned int *hmax, unsigned int *vmin,
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unsigned int *vmax);
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#endif /* __EDID_H_ */
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