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