This driver adds support for the ACPI-WMI (Windows Management
Instrumentation) mapper device (PNP0C14) found on some systems.

ACPI-WMI is a proprietary extension to ACPI to expose parts of the
ACPI firmware to userspace - this is done through various vendor
defined methods and data blocks in a PNP0C14 device, which are then
made available for userspace to call.

The implementation of this in Linux currently only exposes this to
other kernel space drivers.

This driver is a required dependency to build the firmware specific
drivers needed on many machines, including Acer and HP laptops.

It is safe to enable this driver even if your DSDT doesn't define
any ACPI-WMI devices.

source code:

drivers/platform/x86/wmi.c