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edid: Library of EDID decode and print

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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>
master
Tom Wai-Hong Tam 12 years ago committed by Tom Rini
parent bf36c5d521
commit d46b5f7dcb
3 changed files with 583 additions and 0 deletions
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  1. 1
      common/Makefile
  2. 307
      common/edid.c
  3. 275
      include/edid.h

1
common/Makefile
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@ -188,6 +188,7 @@ COBJS-$(CONFIG_BOOTSTAGE) += bootstage.o
COBJS-$(CONFIG_CONSOLE_MUX) += iomux.o
COBJS-y += flash.o
COBJS-$(CONFIG_CMD_KGDB) += kgdb.o kgdb_stubs.o
COBJS-$(CONFIG_I2C_EDID) += edid.o
COBJS-$(CONFIG_KALLSYMS) += kallsyms.o
COBJS-$(CONFIG_LCD) += lcd.o
COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o

307
common/edid.c
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/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* (C) Copyright 2010
* Petr Stetiar <ynezz@true.cz>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Contains stolen code from ddcprobe project which is:
* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
*
*/
#include <common.h>
#include <edid.h>
#include <linux/ctype.h>
#include <linux/string.h>
int edid_check_info(struct edid1_info *edid_info)
{
if ((edid_info == NULL) || (edid_info->version == 0))
return -1;
if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
return -1;
if (edid_info->version == 0xff && edid_info->revision == 0xff)
return -1;
return 0;
}
int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
unsigned int *hmax, unsigned int *vmin,
unsigned int *vmax)
{
int i;
struct edid_monitor_descriptor *monitor;
*hmin = *hmax = *vmin = *vmax = 0;
if (edid_check_info(edid))
return -1;
for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
monitor = &edid->monitor_details.descriptor[i];
if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
*hmin = monitor->data.range_data.horizontal_min;
*hmax = monitor->data.range_data.horizontal_max;
*vmin = monitor->data.range_data.vertical_min;
*vmax = monitor->data.range_data.vertical_max;
return 0;
}
}
return -1;
}
/**
* Snip the tailing whitespace/return of a string.
*
* @param string The string to be snipped
* @return the snipped string
*/
static char *snip(char *string)
{
char *s;
/*
* This is always a 13 character buffer
* and it's not always terminated.
*/
string[12] = '\0';
s = &string[strlen(string) - 1];
while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
*s == '\0'))
*(s--) = '\0';
return string;
}
/**
* Print an EDID monitor descriptor block
*
* @param monitor The EDID monitor descriptor block
* @have_timing Modifies to 1 if the desciptor contains timing info
*/
static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
unsigned int *have_timing)
{
unsigned char *bytes = (unsigned char *)monitor;
struct edid_detailed_timing *timing =
(struct edid_detailed_timing *)monitor;
if (bytes[0] == 0 && bytes[1] == 0) {
if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
printf("Monitor serial number: %s\n",
snip(monitor->data.string));
else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
printf("Monitor ID: %s\n",
snip(monitor->data.string));
else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
printf("Monitor name: %s\n",
snip(monitor->data.string));
else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
printf("Monitor range limits, horizontal sync: "
"%d-%d kHz, vertical refresh: "
"%d-%d Hz, max pixel clock: "
"%d MHz\n",
monitor->data.range_data.horizontal_min,
monitor->data.range_data.horizontal_max,
monitor->data.range_data.vertical_min,
monitor->data.range_data.vertical_max,
monitor->data.range_data.pixel_clock_max * 10);
} else {
uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
uint32_t h_total, v_total, vfreq;
pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
h_total = h_active + h_blanking;
v_total = v_active + v_blanking;
if (v_total * h_total)
vfreq = pixclock / (v_total * h_total);
else
vfreq = 1; /* Error case */
printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
v_active, h_active > 1000 ? ' ' : '\t', vfreq);
*have_timing = 1;
}
}
/**
* Get the manufacturer name from an EDID info.
*
* @param edid_info The EDID info to be printed
* @param name Returns the string of the manufacturer name
*/
static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
{
name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
name[3] = '\0';
}
void edid_print_info(struct edid1_info *edid_info)
{
int i;
char manufacturer[4];
unsigned int have_timing = 0;
uint32_t serial_number;
if (edid_check_info(edid_info)) {
printf("Not a valid EDID\n");
return;
}
printf("EDID version: %d.%d\n",
edid_info->version, edid_info->revision);
printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
edid_get_manufacturer_name(edid_info, manufacturer);
printf("Manufacturer: %s\n", manufacturer);
serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
if (serial_number != 0xffffffff) {
if (strcmp(manufacturer, "MAG") == 0)
serial_number -= 0x7000000;
if (strcmp(manufacturer, "OQI") == 0)
serial_number -= 456150000;
if (strcmp(manufacturer, "VSC") == 0)
serial_number -= 640000000;
}
printf("Serial number: %08x\n", serial_number);
printf("Manufactured in week: %d year: %d\n",
edid_info->week, edid_info->year + 1990);
printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
"digital signal, " : "analog signal, ",
EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
", blank to black" : "",
EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
", separate sync" : "",
EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
", composite sync" : "",
EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
", sync on green" : "",
EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
", serration v" : "");
printf("Monitor is %s\n",
EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
printf("Maximum visible display size: %d cm x %d cm\n",
edid_info->max_size_horizontal,
edid_info->max_size_vertical);
printf("Power management features: %s%s, %s%s, %s%s\n",
EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
"" : "no ", "active off",
EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
printf("Estabilished timings:\n");
if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
printf("\t720x400\t\t88 Hz (XGA2)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
printf("\t640x480\t\t60 Hz (VGA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
printf("\t640x480\t\t72 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
printf("\t640x480\t\t75 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
printf("\t800x600\t\t56 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
printf("\t800x600\t\t60 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
printf("\t800x600\t\t72 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
printf("\t800x600\t\t75 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
printf("\t832x624\t\t75 Hz (Mac II)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
printf("\t1024x768\t60 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
printf("\t1024x768\t70 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
printf("\t1024x768\t75 Hz (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
printf("\t1280x1024\t75 (VESA)\n");
if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
printf("\t1152x870\t75 (Mac II)\n");
/* Standard timings. */
printf("Standard timings:\n");
for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
unsigned int aspect = 10000;
unsigned int x, y;
unsigned char xres, vfreq;
xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
if ((xres != vfreq) ||
((xres != 0) && (xres != 1)) ||
((vfreq != 0) && (vfreq != 1))) {
switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
i)) {
case ASPECT_625:
aspect = 6250;
break;
case ASPECT_75:
aspect = 7500;
break;
case ASPECT_8:
aspect = 8000;
break;
case ASPECT_5625:
aspect = 5625;
break;
}
x = (xres + 31) * 8;
y = x * aspect / 10000;
printf("\t%dx%d%c\t%d Hz\n", x, y,
x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
have_timing = 1;
}
}
/* Detailed timing information. */
for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
i++) {
edid_print_dtd(&edid_info->monitor_details.descriptor[i],
&have_timing);
}
if (!have_timing)
printf("\tNone\n");
}

275
include/edid.h
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/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* (C) Copyright 2010
* Petr Stetiar <ynezz@true.cz>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* 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>
#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 sync_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_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__));
/**
* 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);
/**
* 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);
#endif /* __EDID_H_ */
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