3 files changed, 93 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0485e394712a..94914572dd7f 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -753,4 +753,11 @@ config SAMSUNG_LAPTOP
           To compile this driver as a module, choose M here: the module
           will be called samsung-laptop.
 
+config MXM_WMI
+       tristate "WMI support for MXM Laptop Graphics"
+       depends on WMI
+       ---help---
+          MXM is a standard for laptop graphics cards, the WMI interface
+          is required for switchable nvidia graphics machines
+
 endif # X86_PLATFORM_DEVICES
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 029e8861d086..a7ab3bc7b3a1 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_XO15_EBOOK)	+= xo15-ebook.o
 obj-$(CONFIG_IBM_RTL)           += ibm_rtl.o
 obj-$(CONFIG_SAMSUNG_LAPTOP)    += samsung-laptop.o
 obj-$(CONFIG_INTEL_MFLD_THERMAL)        += intel_mid_thermal.o
+obj-$(CONFIG_MXM_WMI)           += mxm-wmi.o
diff --git a/drivers/platform/x86/mxm-wmi.c b/drivers/platform/x86/mxm-wmi.c
new file mode 100644
index 000000000000..12b6f341e72b
--- /dev/null
+++ b/drivers/platform/x86/mxm-wmi.c
@@ -0,0 +1,85 @@
+/*
+ * MXM WMI driver
+ *
+ * Copyright(C) 2010 Red Hat.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+MODULE_AUTHOR("Dave Airlie");
+MODULE_DESCRIPTION("MXM WMI Driver");
+MODULE_LICENSE("GPL");
+
+#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
+
+MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
+
+#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
+
+struct mxds_args {
+        u32 func;
+        u32 args;
+        u32 xarg;
+};
+
+int mxm_wmi_call_mxds(int adapter)
+{
+        struct mxds_args args = {
+                .func = MXM_WMMX_FUNC_MXDS,
+                .args = 0,
+                .xarg = 1,
+        };
+        struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+        acpi_status status;
+
+        printk("calling mux switch %d\n", adapter);
+        
+        status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input,
+                                     &output);
+
+        if (ACPI_FAILURE(status))
+                return status;
+
+        printk("mux switched %d\n", status);
+        return 0;
+                            
+}
+EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
+
+bool mxm_wmi_supported(void)
+{
+        bool guid_valid;
+        guid_valid = wmi_has_guid(MXM_WMMX_GUID);
+        return guid_valid;
+}
+EXPORT_SYMBOL_GPL(mxm_wmi_supported);
+
+static int __init mxm_wmi_init(void)
+{
+        return 0;
+}
+
+static void __exit mxm_wmi_exit(void)
+{
+}
+
+module_init(mxm_wmi_init);
+module_exit(mxm_wmi_exit);