Commit | Line | Data |
---|---|---|
57293197 TW |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Copyright (C) 2021 Thomas Weißschuh <thomas@weissschuh.net> | |
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 | ||
16 | static bool force_load; | |
17 | module_param(force_load, bool, 0444); | |
18 | MODULE_PARM_DESC(force_load, "Force loading on unknown platform"); | |
19 | ||
20 | static u8 usable_sensors_mask; | |
21 | ||
22 | enum 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 | ||
30 | struct gigabyte_wmi_args { | |
31 | u32 arg1; | |
32 | }; | |
33 | ||
34 | static 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 | ||
51 | static 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 | ||
71 | static 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; // value is a signed 8-bit integer | |
84 | } | |
85 | return ret; | |
86 | } | |
87 | ||
88 | static 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 | ||
96 | static 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 | ||
102 | static 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 | ||
113 | static const struct hwmon_ops gigabyte_wmi_hwmon_ops = { | |
114 | .read = gigabyte_wmi_hwmon_read, | |
115 | .is_visible = gigabyte_wmi_hwmon_is_visible, | |
116 | }; | |
117 | ||
118 | static const struct hwmon_chip_info gigabyte_wmi_hwmon_chip_info = { | |
119 | .ops = &gigabyte_wmi_hwmon_ops, | |
120 | .info = gigabyte_wmi_hwmon_info, | |
121 | }; | |
122 | ||
123 | static 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 | ||
86bf2b8f TW |
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 | ||
57293197 | 142 | static const struct dmi_system_id gigabyte_wmi_known_working_platforms[] = { |
dac282de | 143 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 AORUS ELITE"), |
86bf2b8f TW |
144 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550 GAMING X V2"), |
145 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M AORUS PRO-P"), | |
146 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("B550M DS3H"), | |
147 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("Z390 I AORUS PRO WIFI-CF"), | |
148 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 AORUS ELITE"), | |
149 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 I AORUS PRO WIFI"), | |
8605d64f | 150 | DMI_EXACT_MATCH_GIGABYTE_BOARD_NAME("X570 UD"), |
57293197 TW |
151 | { } |
152 | }; | |
153 | ||
154 | static int gigabyte_wmi_probe(struct wmi_device *wdev, const void *context) | |
155 | { | |
156 | struct device *hwmon_dev; | |
157 | ||
158 | if (!dmi_check_system(gigabyte_wmi_known_working_platforms)) { | |
159 | if (!force_load) | |
160 | return -ENODEV; | |
161 | dev_warn(&wdev->dev, "Forcing load on unknown platform"); | |
162 | } | |
163 | ||
164 | usable_sensors_mask = gigabyte_wmi_detect_sensor_usability(wdev); | |
165 | if (!usable_sensors_mask) { | |
166 | dev_info(&wdev->dev, "No temperature sensors usable"); | |
167 | return -ENODEV; | |
168 | } | |
169 | ||
170 | hwmon_dev = devm_hwmon_device_register_with_info(&wdev->dev, "gigabyte_wmi", wdev, | |
171 | &gigabyte_wmi_hwmon_chip_info, NULL); | |
172 | ||
173 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
174 | } | |
175 | ||
176 | static const struct wmi_device_id gigabyte_wmi_id_table[] = { | |
177 | { GIGABYTE_WMI_GUID, NULL }, | |
178 | { } | |
179 | }; | |
180 | ||
181 | static struct wmi_driver gigabyte_wmi_driver = { | |
182 | .driver = { | |
183 | .name = "gigabyte-wmi", | |
184 | }, | |
185 | .id_table = gigabyte_wmi_id_table, | |
186 | .probe = gigabyte_wmi_probe, | |
187 | }; | |
188 | module_wmi_driver(gigabyte_wmi_driver); | |
189 | ||
190 | MODULE_DEVICE_TABLE(wmi, gigabyte_wmi_id_table); | |
191 | MODULE_AUTHOR("Thomas Weißschuh <thomas@weissschuh.net>"); | |
192 | MODULE_DESCRIPTION("Gigabyte WMI temperature driver"); | |
193 | MODULE_LICENSE("GPL"); |