platform/x86: msi-wmi-platform: Only load on MSI devices

It turns out that the GUID used by the msi-wmi-platform driver
(ABBC0F60-8EA1-11D1-00A0-C90629100000) is not unique, but was instead
copied from the WIndows Driver Samples. This means that this driver
could load on devices from other manufacturers that also copied this
GUID, potentially causing hardware errors.

Prevent this by only loading on devices whitelisted via DMI. The DMI
matches where taken from the msi-ec driver.

Reported-by: Antheas Kapenekakis <[e-mail]>
Fixes: 9c0beb6b29e7 ("platform/x86: wmi: Add MSI WMI Platform driver")
Tested-by: Antheas Kapenekakis <[e-mail]>
Signed-off-by: Armin Wolf <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Reviewed-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>

drivers/platform/x86/Kconfig

···
 config MSI_WMI_PLATFORM
 	tristate "MSI WMI Platform features"
 	depends on ACPI_WMI
+	depends on DMI
 	depends on HWMON
 	help
 	  Say Y here if you want to have support for WMI-based platform features

drivers/platform/x86/msi-wmi-platform.c

···
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/device/driver.h>
+#include <linux/dmi.h>
 #include <linux/errno.h>
 #include <linux/hwmon.h>
 #include <linux/kernel.h>
···
 	.probe = msi_wmi_platform_probe,
 	.no_singleton = true,
 };
-module_wmi_driver(msi_wmi_platform_driver);
+
+/*
+ * MSI reused the WMI GUID from the WMI-ACPI sample code provided by Microsoft,
+ * so other manufacturers might use it as well for their WMI-ACPI implementations.
+ */
+static const struct dmi_system_id msi_wmi_platform_whitelist[] __initconst = {
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT"),
+		},
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
+		},
+	},
+	{ }
+};
+
+static int __init msi_wmi_platform_module_init(void)
+{
+	if (!dmi_check_system(msi_wmi_platform_whitelist)) {
+		if (!force)
+			return -ENODEV;
+
+		pr_warn("Ignoring DMI whitelist\n");
+	}
+
+	return wmi_driver_register(&msi_wmi_platform_driver);
+}
+
+static void __exit msi_wmi_platform_module_exit(void)
+{
+	wmi_driver_unregister(&msi_wmi_platform_driver);
+}
+
+module_init(msi_wmi_platform_module_init);
+module_exit(msi_wmi_platform_module_exit);
+
 
 MODULE_AUTHOR("Armin Wolf <[e-mail]>");
 MODULE_DESCRIPTION("MSI WMI platform features");