text: /*
   * 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 <linux/mxm-wmi.h>
  #include <linux/acpi.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" */
  #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
  
  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, 0x0, adapter, &input,
  				     &output);
  
  	if (ACPI_FAILURE(status))
  		return status;
  
  	printk("mux switched %d\n", status);
  	return 0;
  			    
  }
  EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
  
  int mxm_wmi_call_mxmx(int adapter)
  {
  	struct mxds_args args = {
  		.func = MXM_WMMX_FUNC_MXMX,
  		.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, 0x0, adapter, &input,
  				     &output);
  
  	if (ACPI_FAILURE(status))
  		return status;
  
  	printk("mux mutex set switched %d\n", status);
  	return 0;
  			    
  }
  EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
  
  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);
  