Input: soc_button_array - add support for INT33D3 tablet-mode switch devices

According to the Microsoft documentation for Windows 8 convertible
devices, these devices should implement a PNP0C60 "laptop/slate mode state
indicator" ACPI device.

This device can work in 2 ways, if there is a GPIO which directly
indicates the device is in tablet-mode or not then the direct-gpio mode
should be used. If there is no such GPIO, but instead the events are
coming from e.g. the embedded-controller, then there should still be
a PNP0C60 ACPI device and event-injection should be used to send the
events. The drivers/platform/x86/intel-vbtn.c code is an example from
a standardized manner of doing the latter.

On various 2-in-1s with either a detachable keyboard, or with 360°
hinges, the direct GPIO mode is indicated by an ACPI device with a
HID of INT33D3, which contains a single GpioInt in its ACPI resource
table, which directly indicates if the device is in tablet-mode or not.

This commit adds support for this to the soc_button_array code, as
well as for the alternative ID9001 HID which some devices use
instead of the INT33D3 HID.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200826150601.12137-3-hdegoede@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index e3a22a6..837c787 100644 (file)
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -397,6 +397,15 @@ static const struct soc_device_data soc_device_PNP0C40 = {
        .button_info = soc_button_PNP0C40,
 };
 
+static const struct soc_button_info soc_button_INT33D3[] = {
+       { "tablet_mode", 0, EV_SW, SW_TABLET_MODE, false, false, false },
+       { }
+};
+
+static const struct soc_device_data soc_device_INT33D3 = {
+       .button_info = soc_button_INT33D3,
+};
+
 /*
  * Special device check for Surface Book 2 and Surface Pro (2017).
  * Both, the Surface Pro 4 (surfacepro3_button.c) and the above mentioned
@@ -459,6 +468,8 @@ static const struct soc_device_data soc_device_MSHW0040 = {
 
 static const struct acpi_device_id soc_button_acpi_match[] = {
        { "PNP0C40", (unsigned long)&soc_device_PNP0C40 },
+       { "INT33D3", (unsigned long)&soc_device_INT33D3 },
+       { "ID9001", (unsigned long)&soc_device_INT33D3 },
        { "ACPI0011", 0 },
 
        /* Microsoft Surface Devices (5th and 6th generation) */