drivers/platform/x86/mxm-wmi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * MXM WMI driver
   4  *
   5  * Copyright(C) 2010 Red Hat.
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/mxm-wmi.h>
  11 #include <linux/acpi.h>
  12
  13 MODULE_AUTHOR("Dave Airlie");
  14 MODULE_DESCRIPTION("MXM WMI Driver");
  15 MODULE_LICENSE("GPL");
  16
  17 #define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
  18
  19 MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
  20
  21 #define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
  22 #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
  23
  24 struct mxds_args {
  25         u32 func;
  26         u32 args;
  27         u32 xarg;
  28 };
  29
  30 int mxm_wmi_call_mxds(int adapter)
  31 {
  32         struct mxds_args args = {
  33                 .func = MXM_WMMX_FUNC_MXDS,
  34                 .args = 0,
  35                 .xarg = 1,
  36         };
  37         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  38         acpi_status status;
  39
  40         printk("calling mux switch %d\n", adapter);
  41
  42         status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, NULL);
  43
  44         if (ACPI_FAILURE(status))
  45                 return status;
  46
  47         printk("mux switched %d\n", status);
  48         return 0;
  49
  50 }
  51 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
  52
  53 int mxm_wmi_call_mxmx(int adapter)
  54 {
  55         struct mxds_args args = {
  56                 .func = MXM_WMMX_FUNC_MXMX,
  57                 .args = 0,
  58                 .xarg = 1,
  59         };
  60         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  61         acpi_status status;
  62
  63         printk("calling mux switch %d\n", adapter);
  64
  65         status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, NULL);
  66
  67         if (ACPI_FAILURE(status))
  68                 return status;
  69
  70         printk("mux mutex set switched %d\n", status);
  71         return 0;
  72
  73 }
  74 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
  75
  76 bool mxm_wmi_supported(void)
  77 {
  78         bool guid_valid;
  79         guid_valid = wmi_has_guid(MXM_WMMX_GUID);
  80         return guid_valid;
  81 }
  82 EXPORT_SYMBOL_GPL(mxm_wmi_supported);
  83
  84 static int __init mxm_wmi_init(void)
  85 {
  86         return 0;
  87 }
  88
  89 static void __exit mxm_wmi_exit(void)
  90 {
  91 }
  92
  93 module_init(mxm_wmi_init);
  94 module_exit(mxm_wmi_exit);