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 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 39 acpi_status status; 40 41 printk("calling mux switch %d\n", adapter); 42 43 status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, 44 &output); 45 46 if (ACPI_FAILURE(status)) 47 return status; 48 49 printk("mux switched %d\n", status); 50 return 0; 51 52 } 53 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds); 54 55 int mxm_wmi_call_mxmx(int adapter) 56 { 57 struct mxds_args args = { 58 .func = MXM_WMMX_FUNC_MXMX, 59 .args = 0, 60 .xarg = 1, 61 }; 62 struct acpi_buffer input = { (acpi_size)sizeof(args), &args }; 63 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 64 acpi_status status; 65 66 printk("calling mux switch %d\n", adapter); 67 68 status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, 69 &output); 70 71 if (ACPI_FAILURE(status)) 72 return status; 73 74 printk("mux mutex set switched %d\n", status); 75 return 0; 76 77 } 78 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx); 79 80 bool mxm_wmi_supported(void) 81 { 82 bool guid_valid; 83 guid_valid = wmi_has_guid(MXM_WMMX_GUID); 84 return guid_valid; 85 } 86 EXPORT_SYMBOL_GPL(mxm_wmi_supported); 87 88 static int __init mxm_wmi_init(void) 89 { 90 return 0; 91 } 92 93 static void __exit mxm_wmi_exit(void) 94 { 95 } 96 97 module_init(mxm_wmi_init); 98 module_exit(mxm_wmi_exit); 99