platform/x86: wmi: Add to_wmi_device() helper macro

Add a helper macro for WMI drivers to cast a device to
the corresponding WMI device. This should replace some
boilerplate code.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20231103182526.3524-2-W_Armin@gmx.deReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

include/linux/wmi.h

@@ -27,6 +27,14 @@ struct wmi_device {
 	bool setable;
 };
 
+/**
+ * to_wmi_device() - Helper macro to cast a device to a wmi_device
+ * @device: device struct
+ *
+ * Cast a struct device to a struct wmi_device.
+ */
+#define to_wmi_device(device)	container_of(device, struct wmi_device, dev)
+
 extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev,
 					  u8 instance, u32 method_id,
 					  const struct acpi_buffer *in,