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); 95