| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2021 Thomas Weißschuh <thomas@weissschuh.net> |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/acpi.h> |
| #include <linux/dmi.h> |
| #include <linux/hwmon.h> |
| #include <linux/module.h> |
| #include <linux/wmi.h> |
| |
| #define GIGABYTE_WMI_GUID "DEADBEEF-2001-0000-00A0-C90629100000" |
| #define NUM_TEMPERATURE_SENSORS 6 |
| |
| static bool force_load; |
| module_param(force_load, bool, 0444); |
| MODULE_PARM_DESC(force_load, "Force loading on unknown platform"); |
| |
| static u8 usable_sensors_mask; |
| |
| enum gigabyte_wmi_commandtype { |
| GIGABYTE_WMI_BUILD_DATE_QUERY = 0x1, |
| GIGABYTE_WMI_MAINBOARD_TYPE_QUERY = 0x2, |
| GIGABYTE_WMI_FIRMWARE_VERSION_QUERY = 0x4, |
| GIGABYTE_WMI_MAINBOARD_NAME_QUERY = 0x5, |
| GIGABYTE_WMI_TEMPERATURE_QUERY = 0x125, |
| }; |
| |
| struct gigabyte_wmi_args { |
| u32 arg1; |
| }; |
| |
| static int gigabyte_wmi_perform_query(struct wmi_device *wdev, |
| enum gigabyte_wmi_commandtype command, |
| struct gigabyte_wmi_args *args, struct acpi_buffer *out) |
| { |
| const struct acpi_buffer in = { |
| .length = sizeof(*args), |
| .pointer = args, |
| }; |
| |
| acpi_status ret = wmidev_evaluate_method(wdev, 0x0, command, &in, out); |
| |
| if (ACPI_FAILURE(ret)) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int gigabyte_wmi_query_integer(struct wmi_device *wdev, |
| enum gigabyte_wmi_commandtype command, |
| struct gigabyte_wmi_args *args, u64 *res) |
| { |
| union acpi_object *obj; |
| struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL }; |
| int ret; |
| |
| ret = gigabyte_wmi_perform_query(wdev, command, args, &result); |
| if (ret) |
| return ret; |
| obj = result.pointer; |
| if (obj && obj->type == ACPI_TYPE_INTEGER) |
| *res = obj->integer.value; |
| else |
| ret = -EIO; |
| kfree(result.pointer); |
| return ret; |
| } |
| |
| static int gigabyte_wmi_temperature(struct wmi_device *wdev, u8 sensor, long *res) |
| { |
| struct gigabyte_wmi_args args = { |
| .arg1 = sensor, |
| }; |
| u64 temp; |
| acpi_status ret; |
| |
| ret = gigabyte_wmi_query_integer(wdev, GIGABYTE_WMI_TEMPERATURE_QUERY, &args, &temp); |
| if (ret == 0) { |
| if (temp == 0) |
| return -ENODEV; |
| *res = (s8)temp * 1000; // value is a signed 8-bit integer |
| } |
| return ret; |
| } |
| |
| static int gigabyte_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, |
| u32 attr, int channel, long *val) |
| { |
| struct wmi_device *wdev = dev_get_drvdata(dev); |
| |
| return gigabyte_wmi_temperature(wdev, channel, val); |
| } |
| |
| static umode_t gigabyte_wmi_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, |
| u32 attr, int channel) |
| { |
| return usable_sensors_mask & BIT(channel) ? 0444 : 0; |
| } |
| |
| static const struct hwmon_channel_info *gigabyte_wmi_hwmon_info[] = { |
| HWMON_CHANNEL_INFO(temp, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT), |
| NULL |
| }; |
| |
| static const struct hwmon_ops gigabyte_wmi_hwmon_ops = { |
| .read = gigabyte_wmi_hwmon_read, |
| .is_visible = gigabyte_wmi_hwmon_is_visible, |
| }; |
| |
| static const struct hwmon_chip_info gigabyte_wmi_hwmon_chip_info = { |
| .ops = &gigabyte_wmi_hwmon_ops, |
| .info = gigabyte_wmi_hwmon_info, |
| }; |
| |
| static u8 gigabyte_wmi_detect_sensor_usability(struct wmi_device *wdev) |
| { |
| int i; |
| long temp; |
| u8 r = 0; |
| |
| for (i = 0; i < NUM_TEMPERATURE_SENSORS; i++) { |
| if (!gigabyte_wmi_temperature(wdev, i, &temp)) |
| r |= BIT(i); |
| } |
| return r; |
| } |
| |
| #define DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME(name) \ |
| { .matches = { \ |
| DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), \ |
| DMI_EXACT_MATCH(DMI_BOARD_NAME, name), \ |
| }} |
| |
| static const struct dmi_system_id gigabyte_wmi_known_working_platforms[] = { |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("A320M-S2H V2-CF"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B450M DS3H-CF"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B450M DS3H WIFI-CF"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B450M S2H V2"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE AX V2"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE V2"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 GAMING X V2"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550I AORUS PRO AX"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M AORUS PRO-P"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M DS3H"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("Z390 I AORUS PRO WIFI-CF"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 AORUS ELITE"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 GAMING X"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 I AORUS PRO WIFI"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 UD"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570S AORUS ELITE"), |
| DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("Z690M AORUS ELITE AX DDR4"), |
| { } |
| }; |
| |
| static int gigabyte_wmi_probe(struct wmi_device *wdev, const void *context) |
| { |
| struct device *hwmon_dev; |
| |
| if (!dmi_check_system(gigabyte_wmi_known_working_platforms)) { |
| if (!force_load) |
| return -ENODEV; |
| dev_warn(&wdev->dev, "Forcing load on unknown platform"); |
| } |
| |
| usable_sensors_mask = gigabyte_wmi_detect_sensor_usability(wdev); |
| if (!usable_sensors_mask) { |
| dev_info(&wdev->dev, "No temperature sensors usable"); |
| return -ENODEV; |
| } |
| |
| hwmon_dev = devm_hwmon_device_register_with_info(&wdev->dev, "gigabyte_wmi", wdev, |
| &gigabyte_wmi_hwmon_chip_info, NULL); |
| |
| return PTR_ERR_OR_ZERO(hwmon_dev); |
| } |
| |
| static const struct wmi_device_id gigabyte_wmi_id_table[] = { |
| { GIGABYTE_WMI_GUID, NULL }, |
| { } |
| }; |
| |
| static struct wmi_driver gigabyte_wmi_driver = { |
| .driver = { |
| .name = "gigabyte-wmi", |
| }, |
| .id_table = gigabyte_wmi_id_table, |
| .probe = gigabyte_wmi_probe, |
| }; |
| module_wmi_driver(gigabyte_wmi_driver); |
| |
| MODULE_DEVICE_TABLE(wmi, gigabyte_wmi_id_table); |
| MODULE_AUTHOR("Thomas Weißschuh <thomas@weissschuh.net>"); |
| MODULE_DESCRIPTION("Gigabyte WMI temperature driver"); |
| MODULE_LICENSE("GPL"); |