Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Method(_GWS, 1){
If(LEqual(Arg0, 1) {
Store(…, Local0) //Get DC timer wake status
}
Else {
Store(…, Local0) //Get AC timer wake status
}
Return (Local0)
}
Method(_CWS, 2){
If(LEqual(Arg0, 0) {
Store(0, …)
//Clear AC Wake status
}
Else {
Store(0, …)
//Clear DC Wake status
}
Return(0)
}
} // end of ACPI Wake Alarm device object
Scope(\_GPE) { // Root level event handlers
Method(_Lxx){
Store(One, ...)
Notify(\_SB.AWA, 0x2) //notify the OSPM of device wake
}
} // end of \_GPE scope
Example 2: Define an ACPI Real Time device on a HW-Reduced ACPI
platform
Device(\_SB.I2C1) //The controller used to access the RTC hardware
{
Name (_HID, ...)
...// Other objects required for this I2C controller
// Track status of SPB OpRegion availability for this controller
Name(AVBL, 0)
Method(_REG,2)
{
/* 9 is the OpRegion type for SPB. (8 == GPIO, etc) */
If (Lequal(Arg0, 9))
{
Store(Arg1, ^AVBL)
}
}
}
Device(\_SB.TAAD)
//The Time and Alarm Device
{
Name (_HID, "ACPI000E")
Scope(\_SB.I2C1) //OpRegion declaration must appear under the controller
{
OperationRegion(TOP1, GenericSerialBus, 254, 0x100)
Field(TOP1, BufferAcc, NoLock, Preserve)
{
Connection(I2CSerialBus(0x4a,,400000,,"\\_SB.I2C1",,,,)), //Connection to the
controller for the following field accesses
AccessAs(BufferAcc, AttribWord),
//AccessProtocol for the following field(s)
Y, 8,
AccessAs(BufferAcc, AttribByte),
M, 8,
D, 8,
550 April, 2015 Version 6.0