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// 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/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 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 * const 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;
}
static int gigabyte_wmi_probe(struct wmi_device *wdev, const void *context)
{
struct device *hwmon_dev;
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");
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