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| author | Mario Limonciello <mario.limonciello@dell.com> | 2017-09-08 18:23:11 +0300 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2017-09-20 16:07:22 +0300 |
| commit | ce6a90027c10f970f872de5db0294f9e3e969f1c (patch) | |
| tree | 8f370602c3ae125a6bc68dc3489f395982937069 /Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt | |
| parent | 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e (diff) | |
| download | linux-ce6a90027c10f970f872de5db0294f9e3e969f1c.tar.xz | |
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>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt b/Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt new file mode 100644 index 000000000000..8af65059d519 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-intel-wmi-thunderbolt @@ -0,0 +1,11 @@ +What: /sys/devices/platform/<platform>/force_power +Date: September 2017 +KernelVersion: 4.15 +Contact: "Mario Limonciello" <mario.limonciello@dell.com> +Description: + Modify the platform force power state, influencing + Thunderbolt controllers to turn on or off when no + devices are connected (write-only) + There are two available states: + * 0 -> Force power disabled + * 1 -> Force power enabled |