reactos/win32ss/drivers/miniport/vbe/edid.c

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/*
* ReactOS VBE EDID management
*
* Copyright (C) 2006 Herv<EFBFBD> Poussineau
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/* INCLUDES *******************************************************************/
#include "vbemp.h"
/* PUBLIC AND PRIVATE FUNCTIONS ***********************************************/
static VOID NTAPI
VBEWriteClockLine(
PVOID HwDeviceExtension,
UCHAR data)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_WRITE_SCL_CLOCK_LINE;
BiosRegisters.Ecx = VBEDeviceExtension->CurrentChildIndex;
BiosRegisters.Edx = data;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
}
static VOID NTAPI
VBEWriteDataLine(
PVOID HwDeviceExtension,
UCHAR data)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_WRITE_SDA_DATA_LINE;
BiosRegisters.Ecx = VBEDeviceExtension->CurrentChildIndex;
BiosRegisters.Edx = data;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
}
static BOOLEAN NTAPI
VBEReadClockLine(
PVOID HwDeviceExtension)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_READ_SCL_CLOCK_LINE;
BiosRegisters.Ecx = VBEDeviceExtension->CurrentChildIndex;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
return BiosRegisters.Edx;
}
static BOOLEAN NTAPI
VBEReadDataLine(
PVOID HwDeviceExtension)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_READ_SDA_DATA_LINE;
BiosRegisters.Ecx = VBEDeviceExtension->CurrentChildIndex;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
return BiosRegisters.Edx;
}
static BOOLEAN
VBEReadEdidUsingSCI(
IN PVOID HwDeviceExtension,
IN ULONG ChildIndex,
OUT PVOID Edid)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
DDC_CONTROL DDCControl;
BOOLEAN ret;
VideoPortDebugPrint(Trace, "VBEMP: VBEReadEdidUsingSCI() called\n");
/*
* Check if graphic card support I<EFBFBD>C interface
*/
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_REPORT_CAPABILITIES;
BiosRegisters.Ecx = ChildIndex;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
if (VBE_GETRETURNCODE(BiosRegisters.Eax) != VBE_SUCCESS)
return FALSE;
VideoPortDebugPrint(Info, "VBEMP: VBE/SCI version %x\n", BiosRegisters.Ecx);
if ((BiosRegisters.Ebx & 0xF) != 0xF)
return FALSE;
/*
* Enable I<EFBFBD>C interface
*/
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_BEGIN_SCL_SDA_CONTROL;
BiosRegisters.Ecx = ChildIndex;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
if (VBE_GETRETURNCODE(BiosRegisters.Eax) != VBE_SUCCESS)
return FALSE;
/*
* Read EDID information
*/
VBEDeviceExtension->CurrentChildIndex = ChildIndex;
DDCControl.Size = sizeof(DDC_CONTROL);
DDCControl.I2CCallbacks.WriteClockLine = VBEWriteClockLine;
DDCControl.I2CCallbacks.WriteDataLine = VBEWriteDataLine;
DDCControl.I2CCallbacks.ReadClockLine = VBEReadClockLine;
DDCControl.I2CCallbacks.ReadDataLine = VBEReadDataLine;
DDCControl.EdidSegment = 0;
ret = VideoPortDDCMonitorHelper(
HwDeviceExtension,
&DDCControl,
(PUCHAR)&Edid,
MAX_SIZE_OF_EDID);
/*
* Disable I<EFBFBD>C interface
*/
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_END_SCL_SDA_CONTROL;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
/* Ignore the possible error, as we did our best to prevent problems */
return ret;
}
static BOOLEAN
VBEReadEdid(
IN PVBE_DEVICE_EXTENSION VBEDeviceExtension,
IN ULONG ChildIndex,
OUT PVOID Edid)
{
INT10_BIOS_ARGUMENTS BiosRegisters;
VideoPortDebugPrint(Trace, "VBEMP: VBEReadEdid() called\n");
/*
* Check if DDC1/DDC2 is supported
*/
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
if (VBE_GETRETURNCODE(BiosRegisters.Eax) != VBE_SUCCESS)
return FALSE;
if ((BiosRegisters.Ebx & 3) == 0)
return FALSE;
/*
* Directly read EDID information
*/
VideoPortZeroMemory(&BiosRegisters, sizeof(BiosRegisters));
BiosRegisters.Eax = VBE_DDC;
BiosRegisters.Ebx = VBE_DDC_READ_EDID;
BiosRegisters.Ecx = ChildIndex;
BiosRegisters.Edi = VBEDeviceExtension->TrampolineMemoryOffset;
BiosRegisters.SegEs = VBEDeviceExtension->TrampolineMemorySegment;
VBEDeviceExtension->Int10Interface.Int10CallBios(
VBEDeviceExtension->Int10Interface.Context,
&BiosRegisters);
if (VBE_GETRETURNCODE(BiosRegisters.Eax) != VBE_SUCCESS)
return FALSE;
/*
* Copy the EDID information to our buffer
*/
VBEDeviceExtension->Int10Interface.Int10ReadMemory(
VBEDeviceExtension->Int10Interface.Context,
VBEDeviceExtension->TrampolineMemorySegment,
VBEDeviceExtension->TrampolineMemoryOffset,
Edid,
MAX_SIZE_OF_EDID);
return TRUE;
}
VP_STATUS NTAPI
VBEGetVideoChildDescriptor(
IN PVOID HwDeviceExtension,
IN PVIDEO_CHILD_ENUM_INFO ChildEnumInfo,
OUT PVIDEO_CHILD_TYPE VideoChildType,
OUT PUCHAR pChildDescriptor,
OUT PULONG UId,
OUT PULONG pUnused)
{
if (ChildEnumInfo->Size != sizeof(VIDEO_CHILD_ENUM_INFO) ||
ChildEnumInfo->ChildDescriptorSize < MAX_SIZE_OF_EDID)
{
return ERROR_INVALID_FUNCTION;
}
if (ChildEnumInfo->ChildIndex == 0)
{
/* We don't support enumeration of ACPI children */
return ERROR_NO_MORE_DEVICES;
}
else if (ChildEnumInfo->ChildIndex == 1)
{
/* Our screen */
*VideoChildType = Monitor;
*UId = 1;
/* Try to read EDID information using 2 different methods. */
if (VBEReadEdid(HwDeviceExtension, 0, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read directly\n");
}
else if (VBEReadEdidUsingSCI(HwDeviceExtension, 0, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read using I2C\n");
}
return VIDEO_ENUM_MORE_DEVICES;
}
else
{
/* Unknown hardware id */
return ERROR_NO_MORE_DEVICES;
}
}