Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
• _HID with a value of PNP0C09 to associate this device with the ACPI’s embedded controller’s
driver.
• _CRS to return the resources being consumed by the embedded controller.
• _GPE that returns the general-purpose event bit that this embedded controller is wired to.
Additionally the embedded controller can support up to 255 generic events per embedded controller,
referred to as query events. These query event handles are defined within the embedded controller’s
device as control methods. An example of defining an embedded controller device is shown below:
Device(EC0) {
// PnP ID
Name(_HID, EISAID(“PNP0C09”))
// Returns the “Current Resources” of EC
Name(_CRS,
ResourceTemplate(){
IO(Decode16, 0x62, 0x62, 0, 1)
IO(Decode16, 0x66, 0x66, 0, 1)
})
// Indicate that the EC SCI is bit 0 of the GP_STS register
Name(_GPE, 0) // embedded controller is wired to bit 0 of GPE
}
OperationRegion(\EC0, EmbeddedControl, 0, 0xFF)
Field(EC0, ByteAcc, Lock, Preserve) {
// Field definitions
}
// Query methods
Method(_Q00){...}
Method(_QFF){...}
For more information on the embedded controller, see Section 12, “ACPI Embedded Controller
Interface Specification.”
4.8.4.2.3 Fan
ACPI has a device driver to control fans (active cooling devices) in platforms. A fan is defined as a
device with the Plug and Play ID of “PNP0C0B.” It should then contain a list power resources used
to control the fan.
For more information, see Section 9, “ACPI-Defined Devices and Device Specific Objects.” .
100 April, 2015 Version 6.0