Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
OperationRegion(TOP1, GenericSerialBus, 0x00, 0x100)
Field(TOP1, BufferAcc, NoLock, Preserve)
{
Connection(I2CSerialBus(0x5a,,100000,,"\_SB.I2C",,,,RawDataBuffer(){1,6}))
AccessAs(BufferAcc, AttribRawBytes (4))
TFK1, 8
}
// Create the GenericSerialBus data buffer
Name(BUFF, Buffer(34){})
// Create SerialBus buf as BUFF
CreateByteField(BUFF, 0x00, STAT) // STAT = Status (Byte)
CreateByteField(BUFF, 0x01, LEN) // LEN = Length (Byte)
CreateWordField(BUFF, 0x02, DATW) // DATW = Data (Word - Bytes 2 & 3, or 16 bits)
CreateField(BUFF, 16, 256, DBUF) // DBUF = Data (Bytes 2-34)
CreateField(BUFF, 16, 32, DATD) // DATD = Data (DWord)
Store(0x0B,DATW)
//Store appropriate reference data for driver to interpret
//Read from TFK1
Store(TFK1, BUFF)
If(LNotEqual(STAT, 0x00)) {
Return(0)
}
//Write to TFK1
Store(Store(BUFF,TFK1), BUFF)
If(LNotEqual(STAT, 0x00)) {
Return(0)
}
Access to any field elements will cause a GenericSerialBus transaction to occur to the device of the
length specified in the AccessAttributes.
Raw accesses assume that the writer has knowledge of the bus that the access is made over and the
device that is being accessed. The protocol may only ensure that the buffer is transmitted to the
appropriate driver, but the driver must be able to interpret the buffer to communicate to a register.
5.5.2.4.5.3.10 Raw Block Process Call (AttribRawProcessBytes)
The GenericSerialBus Raw Write-Read Block Process Call protocol (AttribRawProcessBytes)
transfers a block of data bi-directionally (performs a Write Block followed by a Read Block as an
atomic transaction). The initial command value specified in the operation region definition is
ignored by Raw accesses.
The following ASL code illustrates how a device supporting the Process Call protocol should be
accessed:
OperationRegion(TOP1, GenericSerialBus, 0x00, 0x100) // GenericSerialBus device at slave address
0x42
Field(TOP1, BufferAcc, NoLock, Preserve)
{
Connection(I2CSerialBus(0x5a,,100000,,"\_SB.I2C",,,,RawDataBuffer(){1,6}))
AccessAs(BufferAcc, AttribRawProcessBytes) // Use the Raw Bytes Process Call protocol
FLD0, 8
}
240 April, 2015 Version 6.0