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, 13 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 80b87954f6dd..f401ae463e9b 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -658,6 +658,19 @@ config WMI_BMOF
 	  To compile this driver as a module, choose M here: the module will
 	  be called wmi-bmof.
 
+config INTEL_WMI_THUNDERBOLT
+	tristate "Intel WMI thunderbolt force power driver"
+	depends on ACPI_WMI
+	default ACPI_WMI
+	---help---
+	  Say Y here if you want to be able to use the WMI interface on select
+	  systems to force the power control of Intel Thunderbolt controllers.
+	  This is useful for updating the firmware when devices are not plugged
+	  into the controller.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called intel-wmi-thunderbolt.
+
 config MSI_WMI
 	tristate "MSI WMI extras"
 	depends on ACPI_WMI