ACPI configfs support

modulename: acpi_configfs.ko

configname: CONFIG_ACPI_CONFIGFS

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>ACPI configfs support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Select this option to enable support for ACPI configuration from
userspace. The configurable ACPI groups will be visible under
/config/acpi, assuming configfs is mounted under /config.

source code:
drivers/acpi/acpi_configfs.c

depends
CONFIG_ACPI