1
2
3
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
16static bool force_load;
17module_param(force_load, bool, 0444);
18MODULE_PARM_DESC(force_load, "Force loading on unknown platform");
19
20static u8 usable_sensors_mask;
21
22enum 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
30struct gigabyte_wmi_args {
31 u32 arg1;
32};
33
34static 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
51static 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
71static 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;
84 }
85 return ret;
86}
87
88static 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
96static 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
102static 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
113static const struct hwmon_ops gigabyte_wmi_hwmon_ops = {
114 .read = gigabyte_wmi_hwmon_read,
115 .is_visible = gigabyte_wmi_hwmon_is_visible,
116};
117
118static const struct hwmon_chip_info gigabyte_wmi_hwmon_chip_info = {
119 .ops = &gigabyte_wmi_hwmon_ops,
120 .info = gigabyte_wmi_hwmon_info,
121};
122
123static 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
142static const struct dmi_system_id gigabyte_wmi_known_working_platforms[] = {
143 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B450M S2H V2"),
144 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE AX V2"),
145 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE"),
146 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE V2"),
147 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 GAMING X V2"),
148 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550I AORUS PRO AX"),
149 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M AORUS PRO-P"),
150 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M DS3H"),
151 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("Z390 I AORUS PRO WIFI-CF"),
152 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 AORUS ELITE"),
153 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 GAMING X"),
154 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 I AORUS PRO WIFI"),
155 DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 UD"),
156 { }
157};
158
159static int gigabyte_wmi_probe(struct wmi_device *wdev, const void *context)
160{
161 struct device *hwmon_dev;
162
163 if (!dmi_check_system(gigabyte_wmi_known_working_platforms)) {
164 if (!force_load)
165 return -ENODEV;
166 dev_warn(&wdev->dev, "Forcing load on unknown platform");
167 }
168
169 usable_sensors_mask = gigabyte_wmi_detect_sensor_usability(wdev);
170 if (!usable_sensors_mask) {
171 dev_info(&wdev->dev, "No temperature sensors usable");
172 return -ENODEV;
173 }
174
175 hwmon_dev = devm_hwmon_device_register_with_info(&wdev->dev, "gigabyte_wmi", wdev,
176 &gigabyte_wmi_hwmon_chip_info, NULL);
177
178 return PTR_ERR_OR_ZERO(hwmon_dev);
179}
180
181static const struct wmi_device_id gigabyte_wmi_id_table[] = {
182 { GIGABYTE_WMI_GUID, NULL },
183 { }
184};
185
186static struct wmi_driver gigabyte_wmi_driver = {
187 .driver = {
188 .name = "gigabyte-wmi",
189 },
190 .id_table = gigabyte_wmi_id_table,
191 .probe = gigabyte_wmi_probe,
192};
193module_wmi_driver(gigabyte_wmi_driver);
194
195MODULE_DEVICE_TABLE(wmi, gigabyte_wmi_id_table);
196MODULE_AUTHOR("Thomas Weißschuh <thomas@weissschuh.net>");
197MODULE_DESCRIPTION("Gigabyte WMI temperature driver");
198MODULE_LICENSE("GPL");
199
