drivers/platform/x86/mxm-wmi.c

   1 /*
   2  * MXM WMI driver
   3  *
   4  * Copyright(C) 2010 Red Hat.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/mxm-wmi.h>
  24 #include <linux/acpi.h>
  25
  26 MODULE_AUTHOR("Dave Airlie");
  27 MODULE_DESCRIPTION("MXM WMI Driver");
  28 MODULE_LICENSE("GPL");
  29
  30 #define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
  31
  32 MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
  33
  34 #define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
  35 #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
  36
  37 struct mxds_args {
  38         u32 func;
  39         u32 args;
  40         u32 xarg;
  41 };
  42
  43 int mxm_wmi_call_mxds(int adapter)
  44 {
  45         struct mxds_args args = {
  46                 .func = MXM_WMMX_FUNC_MXDS,
  47                 .args = 0,
  48                 .xarg = 1,
  49         };
  50         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  51         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  52         acpi_status status;
  53
  54         printk("calling mux switch %d\n", adapter);
  55
  56         status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  57                                      &output);
  58
  59         if (ACPI_FAILURE(status))
  60                 return status;
  61
  62         printk("mux switched %d\n", status);
  63         return 0;
  64
  65 }
  66 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
  67
  68 int mxm_wmi_call_mxmx(int adapter)
  69 {
  70         struct mxds_args args = {
  71                 .func = MXM_WMMX_FUNC_MXMX,
  72                 .args = 0,
  73                 .xarg = 1,
  74         };
  75         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  76         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  77         acpi_status status;
  78
  79         printk("calling mux switch %d\n", adapter);
  80
  81         status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  82                                      &output);
  83
  84         if (ACPI_FAILURE(status))
  85                 return status;
  86
  87         printk("mux mutex set switched %d\n", status);
  88         return 0;
  89
  90 }
  91 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
  92
  93 bool mxm_wmi_supported(void)
  94 {
  95         bool guid_valid;
  96         guid_valid = wmi_has_guid(MXM_WMMX_GUID);
  97         return guid_valid;
  98 }
  99 EXPORT_SYMBOL_GPL(mxm_wmi_supported);
 100
 101 static int __init mxm_wmi_init(void)
 102 {
 103         return 0;
 104 }
 105
 106 static void __exit mxm_wmi_exit(void)
 107 {
 108 }
 109
 110 module_init(mxm_wmi_init);
 111 module_exit(mxm_wmi_exit);