ACPI device-specific methods

The ACPI 5.0 specification introduces several device-specific methods that are used by Windows to support hardware platforms that use System on a Chip (SoC) integrated circuits. The topics in this section describe the arguments and return values that are defined for these methods.

In this section

TopicDescription

GPIO controller Device-Specific Method (_DSM)

To support a variety of device-class-specific communications between the general-purpose I/O (GPIO) driver stack in Windows and the platform firmware, Microsoft defines a Device-Specific Method (_DSM) that can be included under a GPIO controller in the ACPI namespace.

Battery Device-Specific Method

To support the passive thermal management of the battery by the platform, Microsoft defines a _DSM method to communicate to the platform firmware the thermal throttling limit set by the battery's thermal zone.

Device-Specific Method for Microsoft thermal extensions

To support more flexible design of thermal zones and thermal sensors, Windows supports extensions to the ACPI thermal zone model. Specifically, Windows supports a thermal minimum throttle limit (MTL) for each thermal zone, and also supports sharing a temperature sensor between thermal zones.

USB Device-Specific Method (_DSM)

To support device-class-specific configuration of the USB subsystem, Windows defines a Device-Specific Method (_DSM) that has the functions that are described in this article.

HIDI2C Device-Specific Method (_DSM)

The _DSM method is defined in section 9.14.1, "_DSM (Device Specific Method)", in the ACPI 5.0 specification. This method provides for individual, device-specific data and control functions that can be called by a device driver without conflicting with other such device-specific methods.

Windows button array Device-Specific Method (_DSM)

To support evolution of the Windows Button user interface (UI), Windows defines a Device-Specific Method (_DSM) for the Windows button array device with the function that is described in this article.

 

 

 

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