platform/x86: asus-wmi: Fix kbd_dock_devid tablet-switch reporting

Commit 1ea0d3b4 ("platform/x86: asus-wmi: Simplify tablet-mode-switch
handling") unified the asus-wmi tablet-switch handling, but it did not take
into account that the value returned for the kbd_dock_devid WMI method is
inverted where as the other ones are not inverted.

This causes asus-wmi to report an inverted tablet-switch state for devices
which use the kbd_dock_devid, which causes libinput to ignore touchpad
events while the affected T10x model 2-in-1s are docked.

Add inverting of the return value in the kbd_dock_devid case to fix this.

Fixes: 1ea0d3b4 ("platform/x86: asus-wmi: Simplify tablet-mode-switch handling")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230120143441.527334-1-hdegoede@redhat.com

drivers/platform/x86/asus-wmi.c

@@ -225,6 +225,7 @@ struct asus_wmi {
 
 	int tablet_switch_event_code;
 	u32 tablet_switch_dev_id;
+	bool tablet_switch_inverted;
 
 	enum fan_type fan_type;
 	enum fan_type gpu_fan_type;
@@ -493,6 +494,13 @@ static bool asus_wmi_dev_is_present(struct asus_wmi *asus, u32 dev_id)
 }
 
 /* Input **********************************************************************/
+static void asus_wmi_tablet_sw_report(struct asus_wmi *asus, bool value)
+{
+	input_report_switch(asus->inputdev, SW_TABLET_MODE,
+			    asus->tablet_switch_inverted ? !value : value);
+	input_sync(asus->inputdev);
+}
+
 static void asus_wmi_tablet_sw_init(struct asus_wmi *asus, u32 dev_id, int event_code)
 {
 	struct device *dev = &asus->platform_device->dev;
@@ -501,7 +509,7 @@ static void asus_wmi_tablet_sw_init(struct asus_wmi *asus, u32 dev_id, int event
 	result = asus_wmi_get_devstate_simple(asus, dev_id);
 	if (result >= 0) {
 		input_set_capability(asus->inputdev, EV_SW, SW_TABLET_MODE);
-		input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
+		asus_wmi_tablet_sw_report(asus, result);
 		asus->tablet_switch_dev_id = dev_id;
 		asus->tablet_switch_event_code = event_code;
 	} else if (result == -ENODEV) {
@@ -534,6 +542,7 @@ static int asus_wmi_input_init(struct asus_wmi *asus)
 	case asus_wmi_no_tablet_switch:
 		break;
 	case asus_wmi_kbd_dock_devid:
+		asus->tablet_switch_inverted = true;
 		asus_wmi_tablet_sw_init(asus, ASUS_WMI_DEVID_KBD_DOCK, NOTIFY_KBD_DOCK_CHANGE);
 		break;
 	case asus_wmi_lid_flip_devid:
@@ -573,10 +582,8 @@ static void asus_wmi_tablet_mode_get_state(struct asus_wmi *asus)
 		return;
 
 	result = asus_wmi_get_devstate_simple(asus, asus->tablet_switch_dev_id);
-	if (result >= 0) {
-		input_report_switch(asus->inputdev, SW_TABLET_MODE, result);
-		input_sync(asus->inputdev);
-	}
+	if (result >= 0)
+		asus_wmi_tablet_sw_report(asus, result);
 }
 
 /* dGPU ********************************************************************/