Advanced Configuration and Power Interface Specification

ACPI-Defined Devices and Device-Specific Objects
Example 1: Define an ACPI Wake Alarm device
Device(\_SB.AWAK){
Name(_HID, "ACPI000E") //device ID
Name(_PRW, Package(){...})//enable or disable to wake up the system
OperationRegion(CMOP, EmbeddedControl, ...)
Field(CMOP, ByteAcc, ...){
…….. //timer status and policies
}
Method(_GCP) {
Return (0x03)
//Both AC and DC alarms are implemented; Time capability is NOT supported
}
Method(_STP, 2){
If(LEqual(Arg0, 0) {
Store(Arg1, …)
//Set AC timer policy
}
Else {
Store(Arg1, …)
//Set DC timer policy
}
Return(0)
}
Method(_TIP, 1){
If(LEqual(Arg0, 1) {
Store(…, Local0) //Get DC timer policy
}
Else {
Store(…, Local0) //Get AC timer policy
}
Return (Local0)
}
Method(_STV, 2){
If(LEqual(Arg0, 0) {
Store(Arg1, …)
//Set AC timer value
}
Else {
Store(Arg1, …)
//Set DC timer value
}
Return(0)
}
Method(_TIV, 1){
If(LEqual(Arg0, 1) {
Store(…, Local0)
}
Else {
Store(…, Local0)
}
Return (Local0)
}
//Get DC timer value
//Get AC timer value
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