platform/x86: lenovo-yogabook: Add a yogabook_toggle_digitizer_mode() helper function

Add a yogabook_toggle_digitizer_mode() helper function.

This is a preparation patch for making lenovo-yogabook-wmi also work
on the Android version of the Yoga Book 1 which does not have a WMI
interface to deal with toggling the keyboard half between
touch-keyboard and wacom-digitizer mode.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430165807.472798-14-hdegoede@redhat.com

drivers/platform/x86/lenovo-yogabook-wmi.c

@@ -128,10 +128,8 @@ static void yogabook_wmi_work(struct work_struct *work)
 	}
 }
 
-static void yogabook_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
+static void yogabook_toggle_digitizer_mode(struct yogabook_wmi *data)
 {
-	struct yogabook_wmi *data = dev_get_drvdata(&wdev->dev);
-
 	if (test_bit(YB_SUSPENDED, &data->flags))
 		return;
 
@@ -147,6 +145,11 @@ static void yogabook_wmi_notify(struct wmi_device *wdev, union acpi_object *dumm
 	schedule_work(&data->work);
 }
 
+static void yogabook_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
+{
+	yogabook_toggle_digitizer_mode(dev_get_drvdata(&wdev->dev));
+}
+
 static irqreturn_t yogabook_backside_hall_irq(int irq, void *_data)
 {
 	struct yogabook_wmi *data = _data;