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![Zephaniah E. Loss-Cutler-Hull](/assets/img/avatar_default.png)
This works just fine on my system. Signed-off-by: Zephaniah E. Loss-Cutler-Hull <zephaniah@gmail.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20211005044855.1429724-1-zephaniah@gmail.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
198 lines
5.3 KiB
C
198 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2021 Thomas Weißschuh <thomas@weissschuh.net>
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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("B450M S2H V2"),
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DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE AX V2"),
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DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE"),
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DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE V2"),
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DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 GAMING X V2"),
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DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550I AORUS PRO AX"),
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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 GAMING X"),
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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 <thomas@weissschuh.net>");
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MODULE_DESCRIPTION("Gigabyte WMI temperature driver");
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MODULE_LICENSE("GPL");
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