Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Host
Interface
Embedded Controller
Ports: 0x100, 0x101
Offset: 0x90
Query: 0x31
SMBus
Host
Controller
(0x8)
Virtual
SMBus
SBS
System
Manager
0xA
Virtual
SMBus
SMBus
SMBus
SBS
Battery0
0xB
SBS
Battery1
0xB
SBS
Charger
0x9
SMBus
SBS
Battery2
0xB
Figure 10-61 Smart Battery Subsystem
In this example, the platform is using an SMB-HC that resides within the embedded controller and
meets the ACPI standard for an embedded controller interface and SMB-HC interface. The
embedded controller interface sits at system I/O port addresses 0x100 and 0x101. The SMB-HC
resides at base address 0x90 within embedded controller address space (as defined by the ACPI
embedded controller specification) and responds to events on query value 0x31.
In this example the Smart Battery subsystem supports three Smart Batteries. The Smart Battery
Charger and Smart Battery System Manager reside within the embedded controller, meet the Smart
Battery System Manager and Smart Battery Charger interface specification, and respond to their 7-
bit addresses (0xA and 0x9 respectively). The ASL code for describing this interface is shown
below:
Device (EC1) {
Name (_HID, EISAID("PNP0C09"))
Name (_CRS,
ResourceTemplate () {
// port 0x100 and 0x101
IO(Decode16, 0x100, 0x100, 0, 2)
}
)
Name (_GPE, 1)
Device (SMB1) {
Name (_HID, "ACPI0001")
// Smart Battery Host Controller
Name (_EC, 0x9031)
// EC offset (0x90), Query (0x31)
Device (SBS1){
// Smart Battery Subsystem
Name (_HID, "ACPI0002") // Smart Battery Subsystem ID
Name (_SBS, 0x3)
// Indicates support for three batteries
} // end of SBS1
} // end of SMB1
} // end of EC
10.2 Control Method Batteries
The following section illustrates the operation and definition of the Control Method Battery.
568 April, 2015 Version 6.0