[U-Boot] [PATCH v2 13/23] edid: Library of EDID decode and print
Simon Glass
sjg at chromium.org
Thu Nov 22 20:12:57 CET 2012
From: Tom Wai-Hong Tam <waihong at chromium.org>
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 at chromium.org>
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2: None
common/Makefile | 1 +
common/edid.c | 307 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/edid.h | 275 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 583 insertions(+), 0 deletions(-)
create mode 100644 common/edid.c
create mode 100644 include/edid.h
diff --git a/common/Makefile b/common/Makefile
index 56ec4e4..ba4e0e6 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -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
diff --git a/common/edid.c b/common/edid.c
new file mode 100644
index 0000000..c82c298
--- /dev/null
+++ b/common/edid.c
@@ -0,0 +1,307 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * (C) Copyright 2010
+ * Petr Stetiar <ynezz at 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 at 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");
+}
diff --git a/include/edid.h b/include/edid.h
new file mode 100644
index 0000000..4788de9
--- /dev/null
+++ b/include/edid.h
@@ -0,0 +1,275 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * (C) Copyright 2010
+ * Petr Stetiar <ynezz at 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 at 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_ */
--
1.7.7.3
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