Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
the end user with a meaningful estimation of remaining battery life. As such, control methods that
return battery information should calculate this information rather than return hard coded data.
A Control Method Battery is described as a device object. Each device object supporting the Control
Method Battery interface contains the following additional control methods. When there are two or
more batteries in the system, each battery will have an independent device object in the namespace.
Table 10-272 Battery Control Methods
Object
_BIF
_BIX
_OSC
_BMA
_BMS
_BST
_BTH
_BTP
_PCL
_STA
_BTM
_BCT
_BMD
_BMC
Description
Returns static information about a battery (in other words, model number, serial number, design
voltage, and so on).
Returns extended static information about a battery (in other words, model number, serial number,
design voltage, and so on).
OSPM Capabilities conveyance for batteries.
Sets the averaging interval of the battery capacity measurement, in milliseconds.
Sets the sampling time of the battery capacity measurement, in milliseconds.
Returns the current battery status (in other words, dynamic information about the battery, such as
whether the battery is currently charging or discharging, an estimate of the remaining battery
capacity, and so on).
Communicates battery thermal throttle limit set by battery thermal zone.
Sets the Battery Trip point, which generates an SCI when batterycapacity reaches the specified
point.
List of pointers to the device objects representing devices powered by the battery.
Returns general status of the battery (for a description of the _STA control method, see
Section 6.3.7, “_STA (Status]”).
Returns battery estimated runtime at the present average rate of drain, or the runtime at a specified
rate.
Returns battery estimated charging time.
Returns battery information related to battery recalibration and charging control.
Control calibration and charging.
A Control Method Battery device declaration in the ACPI namespace requires the _GLK object if
potentially contentious accesses to device resources are performed by non-OS code. See
Section 6.5.7, “_GLK (Global Lock),” for details about the _GLK object.
10.2.2.1 _BIF (Battery Information)
This object returns the static portion of the Control Method Battery information. This information
remains constant until the battery is changed. This object is deprecated in ACPI 4.0. The _BIX
object provides expanded battery information and includes all of the information provide by _BIF.
See Section 10.2.2.2, “Battery Information Extended”).
Arguments:
None
570 April, 2015 Version 6.0