xref: /openbmc/linux/Documentation/ABI/testing/sysfs-driver-chromeos-acpi (revision abd4fd43)

What:		/sys/bus/platform/devices/GGL0001:*/BINF.2
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns active EC firmware of current boot (boolean).

		== ===============================
		0  Read only (recovery) firmware.
		1  Rewritable firmware.
		== ===============================

What:		/sys/bus/platform/devices/GGL0001:*/BINF.3
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns main firmware type for current boot (integer).

		== =====================================
		0  Recovery.
		1  Normal.
		2  Developer.
		3  Netboot (factory installation only).
		== =====================================

What:		/sys/bus/platform/devices/GGL0001:*/CHSW
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns switch position for Chrome OS specific hardware
		switches when the firmware is booted (integer).

		==== ===========================================
		0    No changes.
		2    Recovery button was pressed.
		4    Recovery button was pressed (EC firmware).
		32   Developer switch was enabled.
		512  Firmware write protection was disabled.
		==== ===========================================

What:		/sys/bus/platform/devices/GGL0001:*/FMAP
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns physical memory address of the start of the main
		processor firmware flashmap.

What:		/sys/bus/platform/devices/GGL0001:*/FRID
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns firmware version for the read-only portion of the
		main processor firmware.

What:		/sys/bus/platform/devices/GGL0001:*/FWID
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns firmware version for the rewritable portion of the
		main processor firmware.

What:		/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.0
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns type of the GPIO signal for the Chrome OS specific
		GPIO assignments (integer).

		=========== ==================================
		1           Recovery button.
		2           Developer mode switch.
		3           Firmware write protection switch.
		256 to 511  Debug header GPIO 0 to GPIO 255.
		=========== ==================================

What:		/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.1
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns signal attributes of the GPIO signal (integer bitfield).

		== =======================
		0  Signal is active low.
		1  Signal is active high.
		== =======================

What:		/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.2
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns the GPIO number on the specified GPIO
		controller.

What:		/sys/bus/platform/devices/GGL0001:*/GPIO.X/GPIO.3
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns name of the GPIO controller.

What:		/sys/bus/platform/devices/GGL0001:*/HWID
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns hardware ID for the Chromebook.

What:		/sys/bus/platform/devices/GGL0001:*/MECK
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns the SHA-1 or SHA-256 hash that is read out of the
		Management Engine extended registers during boot. The hash
		is exported via ACPI so the OS can verify that the Management
		Engine firmware has not changed. If Management Engine is not
		present, or if the firmware was unable to read the extended registers, this buffer size can be zero.

What:		/sys/bus/platform/devices/GGL0001:*/VBNV.0
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns offset in CMOS bank 0 of the verified boot non-volatile
		storage block, counting from the first writable CMOS byte
		(that is, 'offset = 0' is the byte following the 14 bytes of
		clock data).

What:		/sys/bus/platform/devices/GGL0001:*/VBNV.1
Date:		May 2022
KernelVersion:	5.19
Description:
		Return the size in bytes of the verified boot non-volatile
		storage block.

What:		/sys/bus/platform/devices/GGL0001:*/VDAT
Date:		May 2022
KernelVersion:	5.19
Description:
		Returns the verified boot data block shared between the
		firmware verification step and the kernel verification step
		(binary).