ACPI_STATUS
AcpiExReadGpio (
ACPI_OPERAND_OBJECT *ObjDesc,
void *Buffer)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR (ExReadGpio, ObjDesc);
/*
* For GPIO (GeneralPurposeIo), the Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The BitLength is the length of the field, which
* is thus the number of pins.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"GPIO FieldRead [FROM]: Pin %u Bits %u\n",
ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Perform the read */
Status = AcpiExAccessRegion (
ObjDesc, 0, (UINT64 *) Buffer, ACPI_READ);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExWriteGpio (
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ReturnBuffer)
{
ACPI_STATUS Status;
void *Buffer;
ACPI_FUNCTION_TRACE_PTR (ExWriteGpio, ObjDesc);
/*
* For GPIO (GeneralPurposeIo), we will bypass the entire field
* mechanism and handoff the bit address and bit width directly to
* the handler. The Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The BitLength is the length of the field, which
* is thus the number of pins.
*/
if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n",
AcpiUtGetTypeName (SourceDesc->Common.Type),
SourceDesc->Common.Type, (UINT32) SourceDesc->Integer.Value,
ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength));
Buffer = &SourceDesc->Integer.Value;
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Perform the write */
Status = AcpiExAccessRegion (
ObjDesc, 0, (UINT64 *) Buffer, ACPI_WRITE);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExReadDataFromField (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **RetBufferDesc)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *BufferDesc;
ACPI_SIZE Length;
void *Buffer;
UINT32 Function;
ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
/* Parameter validation */
if (!ObjDesc)
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
if (!RetBufferDesc)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
{
/*
* If the BufferField arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetBufferFieldArguments (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
{
/*
* This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
* the data and then directly access the region handler.
*
* Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
*/
if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
{
Length = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
}
else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
{
Length = ACPI_GSBUS_BUFFER_SIZE;
Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
}
else /* IPMI */
{
Length = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_READ;
}
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Call the region handler for the read */
Status = AcpiExAccessRegion (ObjDesc, 0,
ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer),
Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
goto Exit;
}
/*
* Allocate a buffer for the contents of the field.
*
* If the field is larger than the current integer width, create
* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
* the use of arithmetic operators on the returned value if the
* field size is equal or smaller than an Integer.
*
* Note: Field.length is in bits.
*/
Length = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->Field.BitLength);
if (Length > AcpiGbl_IntegerByteWidth)
{
/* Field is too large for an Integer, create a Buffer instead */
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Buffer = BufferDesc->Buffer.Pointer;
}
else
{
/* Field will fit within an Integer (normal case) */
BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Length = AcpiGbl_IntegerByteWidth;
Buffer = &BufferDesc->Integer.Value;
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
ObjDesc, ObjDesc->Common.Type, Buffer, (UINT32) Length));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
ObjDesc->CommonField.BitLength,
ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BaseByteOffset));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Read from the field */
Status = AcpiExExtractFromField (ObjDesc, Buffer, (UINT32) Length);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
Exit:
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (BufferDesc);
}
else
{
*RetBufferDesc = BufferDesc;
}
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExWriteDataToField (
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc)
{
ACPI_STATUS Status;
UINT32 Length;
void *Buffer;
ACPI_OPERAND_OBJECT *BufferDesc;
UINT32 Function;
ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
/* Parameter validation */
if (!SourceDesc || !ObjDesc)
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
{
/*
* If the BufferField arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetBufferFieldArguments (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
{
/*
* This is an SMBus, GSBus or IPMI write. We will bypass the entire field
* mechanism and handoff the buffer directly to the handler. For
* these address spaces, the buffer is bi-directional; on a write,
* return data is returned in the same buffer.
*
* Source must be a buffer of sufficient size:
* ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
*
* Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
*/
if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
{
ACPI_ERROR ((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
AcpiUtGetObjectTypeName (SourceDesc)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS)
{
Length = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
}
else if (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS)
{
Length = ACPI_GSBUS_BUFFER_SIZE;
Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
}
else /* IPMI */
{
Length = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_WRITE;
}
if (SourceDesc->Buffer.Length < Length)
{
ACPI_ERROR ((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
Length, SourceDesc->Buffer.Length));
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
/* Create the bi-directional buffer */
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Buffer = BufferDesc->Buffer.Pointer;
ACPI_MEMCPY (Buffer, SourceDesc->Buffer.Pointer, Length);
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
*/
Status = AcpiExAccessRegion (ObjDesc, 0,
(UINT64 *) Buffer, Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
*ResultDesc = BufferDesc;
return_ACPI_STATUS (Status);
}
/* Get a pointer to the data to be written */
switch (SourceDesc->Common.Type)
{
case ACPI_TYPE_INTEGER:
Buffer = &SourceDesc->Integer.Value;
Length = sizeof (SourceDesc->Integer.Value);
break;
case ACPI_TYPE_BUFFER:
Buffer = SourceDesc->Buffer.Pointer;
Length = SourceDesc->Buffer.Length;
break;
case ACPI_TYPE_STRING:
Buffer = SourceDesc->String.Pointer;
Length = SourceDesc->String.Length;
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
SourceDesc->Common.Type, Buffer, Length));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
ObjDesc->Common.Type,
ObjDesc->CommonField.BitLength,
ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BaseByteOffset));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Write to the field */
Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExWriteDataToField (
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc)
{
ACPI_STATUS Status;
UINT32 Length;
void *Buffer;
ACPI_OPERAND_OBJECT *BufferDesc;
UINT32 Function;
UINT16 AccessorType;
ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
/* Parameter validation */
if (!SourceDesc || !ObjDesc)
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
{
/*
* If the BufferField arguments have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetBufferFieldArguments (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI))
{
/*
* This is an SMBus, GSBus or IPMI write. We will bypass the entire
* field mechanism and handoff the buffer directly to the handler.
* For these address spaces, the buffer is bi-directional; on a
* write, return data is returned in the same buffer.
*
* Source must be a buffer of sufficient size:
* ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or
* ACPI_IPMI_BUFFER_SIZE.
*
* Note: SMBus and GSBus protocol type is passed in upper 16-bits
* of Function
*/
if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
{
ACPI_ERROR ((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires "
"Buffer, found type %s",
AcpiUtGetObjectTypeName (SourceDesc)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
if (ObjDesc->Field.RegionObj->Region.SpaceId ==
ACPI_ADR_SPACE_SMBUS)
{
Length = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
}
else if (ObjDesc->Field.RegionObj->Region.SpaceId ==
ACPI_ADR_SPACE_GSBUS)
{
AccessorType = ObjDesc->Field.Attribute;
Length = AcpiExGetSerialAccessLength (
AccessorType, ObjDesc->Field.AccessLength);
/*
* Add additional 2 bytes for the GenericSerialBus data buffer:
*
* Status; (Byte 0 of the data buffer)
* Length; (Byte 1 of the data buffer)
* Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
*/
Length += 2;
Function = ACPI_WRITE | (AccessorType << 16);
}
else /* IPMI */
{
Length = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_WRITE;
}
if (SourceDesc->Buffer.Length < Length)
{
ACPI_ERROR ((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires "
"Buffer of length %u, found length %u",
Length, SourceDesc->Buffer.Length));
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
/* Create the bi-directional buffer */
BufferDesc = AcpiUtCreateBufferObject (Length);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Buffer = BufferDesc->Buffer.Pointer;
memcpy (Buffer, SourceDesc->Buffer.Pointer, Length);
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
*/
Status = AcpiExAccessRegion (
ObjDesc, 0, (UINT64 *) Buffer, Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
*ResultDesc = BufferDesc;
return_ACPI_STATUS (Status);
}
else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
{
/*
* For GPIO (GeneralPurposeIo), we will bypass the entire field
* mechanism and handoff the bit address and bit width directly to
* the handler. The Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The BitLength is the length of the field, which
* is thus the number of pins.
*/
if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n",
AcpiUtGetTypeName (SourceDesc->Common.Type),
SourceDesc->Common.Type, (UINT32) SourceDesc->Integer.Value,
ObjDesc->Field.PinNumberIndex, ObjDesc->Field.BitLength));
Buffer = &SourceDesc->Integer.Value;
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Perform the write */
Status = AcpiExAccessRegion (
ObjDesc, 0, (UINT64 *) Buffer, ACPI_WRITE);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}
/* Get a pointer to the data to be written */
switch (SourceDesc->Common.Type)
{
case ACPI_TYPE_INTEGER:
Buffer = &SourceDesc->Integer.Value;
Length = sizeof (SourceDesc->Integer.Value);
break;
case ACPI_TYPE_BUFFER:
Buffer = SourceDesc->Buffer.Pointer;
Length = SourceDesc->Buffer.Length;
break;
case ACPI_TYPE_STRING:
Buffer = SourceDesc->String.Pointer;
Length = SourceDesc->String.Length;
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
SourceDesc->Common.Type, Buffer, Length));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
ObjDesc->Common.Type,
ObjDesc->CommonField.BitLength,
ObjDesc->CommonField.StartFieldBitOffset,
ObjDesc->CommonField.BaseByteOffset));
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Write to the field */
Status = AcpiExInsertIntoField (ObjDesc, Buffer, Length);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExWriteSerialBus (
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ReturnBuffer)
{
ACPI_STATUS Status;
UINT32 BufferLength;
UINT32 DataLength;
void *Buffer;
ACPI_OPERAND_OBJECT *BufferDesc;
UINT32 Function;
UINT16 AccessorType;
ACPI_FUNCTION_TRACE_PTR (ExWriteSerialBus, ObjDesc);
/*
* This is an SMBus, GSBus or IPMI write. We will bypass the entire
* field mechanism and handoff the buffer directly to the handler.
* For these address spaces, the buffer is bidirectional; on a
* write, return data is returned in the same buffer.
*
* Source must be a buffer of sufficient size, these are fixed size:
* ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
*
* Note: SMBus and GSBus protocol type is passed in upper 16-bits
* of Function
*
* Common buffer format:
* Status; (Byte 0 of the data buffer)
* Length; (Byte 1 of the data buffer)
* Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
*/
if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
{
ACPI_ERROR ((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires "
"Buffer, found type %s",
AcpiUtGetObjectTypeName (SourceDesc)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
switch (ObjDesc->Field.RegionObj->Region.SpaceId)
{
case ACPI_ADR_SPACE_SMBUS:
BufferLength = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_WRITE | (ObjDesc->Field.Attribute << 16);
break;
case ACPI_ADR_SPACE_IPMI:
BufferLength = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_WRITE;
break;
case ACPI_ADR_SPACE_GSBUS:
AccessorType = ObjDesc->Field.Attribute;
Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength);
if (ACPI_FAILURE (Status))
{
ACPI_ERROR ((AE_INFO,
"Invalid protocol ID for GSBus: 0x%4.4X", AccessorType));
return_ACPI_STATUS (Status);
}
/* Add header length to get the full size of the buffer */
BufferLength += ACPI_SERIAL_HEADER_SIZE;
Function = ACPI_WRITE | (AccessorType << 16);
break;
default:
return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
}
/* Create the transfer/bidirectional/return buffer */
BufferDesc = AcpiUtCreateBufferObject (BufferLength);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the input buffer data to the transfer buffer */
Buffer = BufferDesc->Buffer.Pointer;
DataLength = (BufferLength < SourceDesc->Buffer.Length ?
BufferLength : SourceDesc->Buffer.Length);
memcpy (Buffer, SourceDesc->Buffer.Pointer, DataLength);
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/*
* Perform the write (returns status and perhaps data in the
* same buffer)
*/
Status = AcpiExAccessRegion (
ObjDesc, 0, (UINT64 *) Buffer, Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
*ReturnBuffer = BufferDesc;
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExReadSerialBus (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ReturnBuffer)
{
ACPI_STATUS Status;
UINT32 BufferLength;
ACPI_OPERAND_OBJECT *BufferDesc;
UINT32 Function;
UINT16 AccessorType;
ACPI_FUNCTION_TRACE_PTR (ExReadSerialBus, ObjDesc);
/*
* This is an SMBus, GSBus or IPMI read. We must create a buffer to
* hold the data and then directly access the region handler.
*
* Note: SMBus and GSBus protocol value is passed in upper 16-bits
* of Function
*
* Common buffer format:
* Status; (Byte 0 of the data buffer)
* Length; (Byte 1 of the data buffer)
* Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
*/
switch (ObjDesc->Field.RegionObj->Region.SpaceId)
{
case ACPI_ADR_SPACE_SMBUS:
BufferLength = ACPI_SMBUS_BUFFER_SIZE;
Function = ACPI_READ | (ObjDesc->Field.Attribute << 16);
break;
case ACPI_ADR_SPACE_IPMI:
BufferLength = ACPI_IPMI_BUFFER_SIZE;
Function = ACPI_READ;
break;
case ACPI_ADR_SPACE_GSBUS:
AccessorType = ObjDesc->Field.Attribute;
if (AccessorType == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES)
{
ACPI_ERROR ((AE_INFO,
"Invalid direct read using bidirectional write-then-read protocol"));
return_ACPI_STATUS (AE_AML_PROTOCOL);
}
Status = AcpiExGetProtocolBufferLength (AccessorType, &BufferLength);
if (ACPI_FAILURE (Status))
{
ACPI_ERROR ((AE_INFO,
"Invalid protocol ID for GSBus: 0x%4.4X", AccessorType));
return_ACPI_STATUS (Status);
}
/* Add header length to get the full size of the buffer */
BufferLength += ACPI_SERIAL_HEADER_SIZE;
Function = ACPI_READ | (AccessorType << 16);
break;
default:
return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
}
/* Create the local transfer buffer that is returned to the caller */
BufferDesc = AcpiUtCreateBufferObject (BufferLength);
if (!BufferDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Lock entire transaction if requested */
AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
/* Call the region handler for the write-then-read */
Status = AcpiExAccessRegion (ObjDesc, 0,
ACPI_CAST_PTR (UINT64, BufferDesc->Buffer.Pointer), Function);
AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
*ReturnBuffer = BufferDesc;
return_ACPI_STATUS (Status);
}