platform/x86: Add driver to force WMI Thunderbolt controller power status

Current implementations of Intel Thunderbolt controllers will go
into a low power mode when not in use.

Many machines containing these controllers also have a GPIO wired up
that can force the controller awake.  This is offered via a ACPI-WMI
interface intended to be manipulated by a userspace utility.

This mechanism is provided by Intel to OEMs to include in BIOS.
It uses an industry wide GUID that is populated in a separate _WDG
entry with no binary MOF.

This interface allows software such as fwupd to wake up thunderbolt
controllers to query the firmware version or flash new firmware.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
[andy fixed merge conflicts and bump kernel version for ABI]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 2281af4b41b6..a6a5746ced9d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7092,6 +7092,11 @@ F:	Documentation/wimax/README.i2400m
 F:      drivers/net/wimax/i2400m/
 F:      include/uapi/linux/wimax/i2400m.h
 
+INTEL WMI THUNDERBOLT FORCE POWER DRIVER
+M:      Mario Limonciello <mario.limonciello@dell.com>
+S:      Maintained
+F:      drivers/platform/x86/intel-wmi-thunderbolt.c
+
 INTEL(R) TRACE HUB
 M:      Alexander Shishkin <alexander.shishkin@linux.intel.com>
 S:      Supported