platform/x86: Add custom surface3 platform device for controlling LID
The LID state provided by ACPI on the Surface 3 is not accurate.
The ACPI node doesn't get notified on LID open, which means the
LID input switch stays close most of the time.
Fortunatelly, there is a WMI method which directly queries the
GPIO underneath the LID state, so it's far more reliable than ACPI.
To get the notifications that the LID was opened/closed, we can
rely on the ACPI notification of the touchscreen: the DSDT shows
that the touchscreen will get notified on close/open as it also
controls its _STA method.
Note that we need to set the tag "power-switch" to the LID
input node through a udev rule for logind to accept it:
SUBSYSTEM=="input", KERNEL=="event*", KERNELS=="surface3-wmi", \
TAG+="power-switch"
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 4639d97..0414d76d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -363,6 +363,18 @@
This is a driver for Lenovo IdeaPad netbooks contains drivers for
rfkill switch, hotkey, fan control and backlight control.
+config SURFACE3_WMI
+ tristate "Surface 3 WMI Driver"
+ depends on ACPI_WMI
+ depends on DMI
+ depends on INPUT
+ depends on SPI
+ ---help---
+ Say Y here if you have a Surface 3.
+
+ To compile this driver as a module, choose M here: the module will
+ be called surface3-wmi.
+
config THINKPAD_ACPI
tristate "ThinkPad ACPI Laptop Extras"
depends on ACPI