1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2021 Thomas Weißschuh <thomas@weissschuh.net> 4 */ 5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 6 7 #include <linux/acpi.h> 8 #include <linux/dmi.h> 9 #include <linux/hwmon.h> 10 #include <linux/module.h> 11 #include <linux/wmi.h> 12 13 #define GIGABYTE_WMI_GUID "DEADBEEF-2001-0000-00A0-C90629100000" 14 #define NUM_TEMPERATURE_SENSORS 6 15 16 static bool force_load; 17 module_param(force_load, bool, 0444); 18 MODULE_PARM_DESC(force_load, "Force loading on unknown platform"); 19 20 static u8 usable_sensors_mask; 21 22 enum gigabyte_wmi_commandtype { 23 GIGABYTE_WMI_BUILD_DATE_QUERY = 0x1, 24 GIGABYTE_WMI_MAINBOARD_TYPE_QUERY = 0x2, 25 GIGABYTE_WMI_FIRMWARE_VERSION_QUERY = 0x4, 26 GIGABYTE_WMI_MAINBOARD_NAME_QUERY = 0x5, 27 GIGABYTE_WMI_TEMPERATURE_QUERY = 0x125, 28 }; 29 30 struct gigabyte_wmi_args { 31 u32 arg1; 32 }; 33 34 static int gigabyte_wmi_perform_query(struct wmi_device *wdev, 35 enum gigabyte_wmi_commandtype command, 36 struct gigabyte_wmi_args *args, struct acpi_buffer *out) 37 { 38 const struct acpi_buffer in = { 39 .length = sizeof(*args), 40 .pointer = args, 41 }; 42 43 acpi_status ret = wmidev_evaluate_method(wdev, 0x0, command, &in, out); 44 45 if (ACPI_FAILURE(ret)) 46 return -EIO; 47 48 return 0; 49 } 50 51 static int gigabyte_wmi_query_integer(struct wmi_device *wdev, 52 enum gigabyte_wmi_commandtype command, 53 struct gigabyte_wmi_args *args, u64 *res) 54 { 55 union acpi_object *obj; 56 struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL }; 57 int ret; 58 59 ret = gigabyte_wmi_perform_query(wdev, command, args, &result); 60 if (ret) 61 return ret; 62 obj = result.pointer; 63 if (obj && obj->type == ACPI_TYPE_INTEGER) 64 *res = obj->integer.value; 65 else 66 ret = -EIO; 67 kfree(result.pointer); 68 return ret; 69 } 70 71 static int gigabyte_wmi_temperature(struct wmi_device *wdev, u8 sensor, long *res) 72 { 73 struct gigabyte_wmi_args args = { 74 .arg1 = sensor, 75 }; 76 u64 temp; 77 acpi_status ret; 78 79 ret = gigabyte_wmi_query_integer(wdev, GIGABYTE_WMI_TEMPERATURE_QUERY, &args, &temp); 80 if (ret == 0) { 81 if (temp == 0) 82 return -ENODEV; 83 *res = (s8)temp * 1000; // value is a signed 8-bit integer 84 } 85 return ret; 86 } 87 88 static int gigabyte_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, 89 u32 attr, int channel, long *val) 90 { 91 struct wmi_device *wdev = dev_get_drvdata(dev); 92 93 return gigabyte_wmi_temperature(wdev, channel, val); 94 } 95 96 static umode_t gigabyte_wmi_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, 97 u32 attr, int channel) 98 { 99 return usable_sensors_mask & BIT(channel) ? 0444 : 0; 100 } 101 102 static const struct hwmon_channel_info *gigabyte_wmi_hwmon_info[] = { 103 HWMON_CHANNEL_INFO(temp, 104 HWMON_T_INPUT, 105 HWMON_T_INPUT, 106 HWMON_T_INPUT, 107 HWMON_T_INPUT, 108 HWMON_T_INPUT, 109 HWMON_T_INPUT), 110 NULL 111 }; 112 113 static const struct hwmon_ops gigabyte_wmi_hwmon_ops = { 114 .read = gigabyte_wmi_hwmon_read, 115 .is_visible = gigabyte_wmi_hwmon_is_visible, 116 }; 117 118 static const struct hwmon_chip_info gigabyte_wmi_hwmon_chip_info = { 119 .ops = &gigabyte_wmi_hwmon_ops, 120 .info = gigabyte_wmi_hwmon_info, 121 }; 122 123 static u8 gigabyte_wmi_detect_sensor_usability(struct wmi_device *wdev) 124 { 125 int i; 126 long temp; 127 u8 r = 0; 128 129 for (i = 0; i < NUM_TEMPERATURE_SENSORS; i++) { 130 if (!gigabyte_wmi_temperature(wdev, i, &temp)) 131 r |= BIT(i); 132 } 133 return r; 134 } 135 136 #define DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME(name) \ 137 { .matches = { \ 138 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), \ 139 DMI_EXACT_MATCH(DMI_BOARD_NAME, name), \ 140 }} 141 142 static const struct dmi_system_id gigabyte_wmi_known_working_platforms[] = { 143 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE"), 144 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 GAMING X V2"), 145 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M AORUS PRO-P"), 146 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M DS3H"), 147 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("Z390 I AORUS PRO WIFI-CF"), 148 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 AORUS ELITE"), 149 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 I AORUS PRO WIFI"), 150 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 UD"), 151 { } 152 }; 153 154 static int gigabyte_wmi_probe(struct wmi_device *wdev, const void *context) 155 { 156 struct device *hwmon_dev; 157 158 if (!dmi_check_system(gigabyte_wmi_known_working_platforms)) { 159 if (!force_load) 160 return -ENODEV; 161 dev_warn(&wdev->dev, "Forcing load on unknown platform"); 162 } 163 164 usable_sensors_mask = gigabyte_wmi_detect_sensor_usability(wdev); 165 if (!usable_sensors_mask) { 166 dev_info(&wdev->dev, "No temperature sensors usable"); 167 return -ENODEV; 168 } 169 170 hwmon_dev = devm_hwmon_device_register_with_info(&wdev->dev, "gigabyte_wmi", wdev, 171 &gigabyte_wmi_hwmon_chip_info, NULL); 172 173 return PTR_ERR_OR_ZERO(hwmon_dev); 174 } 175 176 static const struct wmi_device_id gigabyte_wmi_id_table[] = { 177 { GIGABYTE_WMI_GUID, NULL }, 178 { } 179 }; 180 181 static struct wmi_driver gigabyte_wmi_driver = { 182 .driver = { 183 .name = "gigabyte-wmi", 184 }, 185 .id_table = gigabyte_wmi_id_table, 186 .probe = gigabyte_wmi_probe, 187 }; 188 module_wmi_driver(gigabyte_wmi_driver); 189 190 MODULE_DEVICE_TABLE(wmi, gigabyte_wmi_id_table); 191 MODULE_AUTHOR("Thomas Weißschuh <thomas@weissschuh.net>"); 192 MODULE_DESCRIPTION("Gigabyte WMI temperature driver"); 193 MODULE_LICENSE("GPL"); 194