Advanced Configuration and Power Interface Specification

ACPI Hardware Specification
Power
Button
Momentary
Momentary
PWRBTN#
Embedded Controller Interface
ACPI-Compatible
Chip Set
8
EC_CS#
EXTSMI#
EXTPME#
Embedded
Controller
AC#
DOCK#
Docking
Chip
LID
Switch
LID#
RI#
GPx_REG
Block
SMI Only
Events
EXTSMI#
EXTSMI#
EXTSMI#
SMI-only
sources
AC_STS
E0.0
EC_STS
GP_STS.0
EXTPME#
EXTPME#
EXTPME#
34
AC#
DOCK_STS
P0.40.1
35
DOCK#
DOCK#
SCI#
Shareable
Interrupt
EC_EN
GP_EN.0
RI_STS
GP_STS.1
RI#
RI_EN
GP_EN.1
LID_STS
GP_STS.2
Debounce
LID
LID_EN
GP_EN.2
Other SCI
sources
LID_POL
S33.2
Figure 4-21 Example of General-Purpose vs. Generic Hardware Events
At the top level, the generic events in the GPEx_STS register are the:
• Embedded controller interrupt, which contains two query events: one for AC detection and one
for docking (the docking query event has a child interrupt status bit in the docking chip).
• Ring indicate status (used for waking the system).
• Lid status.
The embedded controller event status bit (EC_STS) is used to indicate that one of two query events
is active.
• A query event is generated when the AC# signal is asserted. The embedded controller returns a
query value of 34 (any byte number can be used) upon a query command in response to this
event; OSPM will then schedule for execution the control method associated with query value
34.
Another query event is for the docking chip that generates a docking event. In this case, the
embedded controller will return a query value of 35 upon a query command from system software
responding to an SCI from the embedded controller. OSPM will then schedule the control method
associated with the query value of 35 to be executed, which services the docking event.
Version 6.0 95