platform/x86: dell-wmi-descriptor: split WMI descriptor into it's own driver

All communication on individual GUIDs should occur in separate drivers.
Allowing a driver to communicate with the bus to another GUID is just
a hack that discourages drivers to adopt the bus model.

The information found from the WMI descriptor driver is now exported
for use by other drivers.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Edward O'Callaghan <quasisec@google.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

drivers/platform/x86/dell-wmi-descriptor.h

@@ -0,0 +1,21 @@
+/*
+ *  Dell WMI descriptor driver
+ *
+ *  Copyright (c) 2017 Dell Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+#ifndef _DELL_WMI_DESCRIPTOR_H_
+#define _DELL_WMI_DESCRIPTOR_H_
+
+#include <linux/wmi.h>
+
+#define DELL_WMI_DESCRIPTOR_GUID "8D9DDCBC-A997-11DA-B012-B622A1EF5492"
+
+bool dell_wmi_get_interface_version(u32 *version);
+bool dell_wmi_get_size(u32 *size);
+
+#endif