1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// SPDX-License-Identifier: GPL-2.0+
/*
* nzxt-kraken2.c - hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers
*
* The device asynchronously sends HID reports (with id 0x04) twice a second to
* communicate current fan speed, pump speed and coolant temperature. The
* device does not respond to Get_Report requests for this status report.
*
* Copyright 2019-2021 Jonas Malaco <jonas@protocubo.io>
*/
#include <asm/unaligned.h>
#include <linux/hid.h>
#include <linux/hwmon.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#define STATUS_REPORT_ID 0x04
#define STATUS_VALIDITY 2 /* seconds; equivalent to 4 missed updates */
static const char *const kraken2_temp_label[] = {
"Coolant",
};
static const char *const kraken2_fan_label[] = {
"Fan",
"Pump",
};
struct kraken2_priv_data {
struct hid_device *hid_dev;
struct device *hwmon_dev;
s32 temp_input[1];
u16 fan_input[2];
unsigned long updated; /* jiffies */
};
static umode_t kraken2_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
return 0444;
}
static int kraken2_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct kraken2_priv_data *priv = dev_get_drvdata(dev);
if (time_after(jiffies, priv->updated + STATUS_VALIDITY * HZ))
return -ENODATA;
switch (type) {
case hwmon_temp:
*val = priv->temp_input[channel];
break;
case hwmon_fan:
*val = priv->fan_input[channel];
break;
default:
return -EOPNOTSUPP; /* unreachable */
}
return 0;
}
static int kraken2_read_string(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
switch (type) {
case hwmon_temp:
*str = kraken2_temp_label[channel];
break;
case hwmon_fan:
*str = kraken2_fan_label[channel];
break;
default:
return -EOPNOTSUPP; /* unreachable */
}
return 0;
}
static const struct hwmon_ops kraken2_hwmon_ops = {
.is_visible = kraken2_is_visible,
.read = kraken2_read,
.read_string = kraken2_read_string,
};
static const struct hwmon_channel_info *kraken2_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL),
NULL
};
static const struct hwmon_chip_info kraken2_chip_info = {
.ops = &kraken2_hwmon_ops,
.info = kraken2_info,
};
static int kraken2_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data, int size)
{
struct kraken2_priv_data *priv;
if (size < 7 || report->id != STATUS_REPORT_ID)
return 0;
priv = hid_get_drvdata(hdev);
/*
* The fractional byte of the coolant temperature has been observed to
* be in the interval [1,9], but some of these steps are also
* consistently skipped for certain integer parts.
*
* For the lack of a better idea, assume that the resolution is 0.1°C,
* and that the missing steps are artifacts of how the firmware
* processes the raw sensor data.
*/
priv->temp_input[0] = data[1] * 1000 + data[2] * 100;
priv->fan_input[0] = get_unaligned_be16(data + 3);
priv->fan_input[1] = get_unaligned_be16(data + 5);
priv->updated = jiffies;
return 0;
}
static int kraken2_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct kraken2_priv_data *priv;
int ret;
priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->hid_dev = hdev;
hid_set_drvdata(hdev, priv);
/*
* Initialize ->updated to STATUS_VALIDITY seconds in the past, making
* the initial empty data invalid for kraken2_read without the need for
* a special case there.
*/
priv->updated = jiffies - STATUS_VALIDITY * HZ;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "hid parse failed with %d\n", ret);
return ret;
}
/*
* Enable hidraw so existing user-space tools can continue to work.
*/
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret) {
hid_err(hdev, "hid hw start failed with %d\n", ret);
goto fail_and_stop;
}
ret = hid_hw_open(hdev);
if (ret) {
hid_err(hdev, "hid hw open failed with %d\n", ret);
goto fail_and_close;
}
priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "kraken2",
priv, &kraken2_chip_info,
NULL);
if (IS_ERR(priv->hwmon_dev)) {
ret = PTR_ERR(priv->hwmon_dev);
hid_err(hdev, "hwmon registration failed with %d\n", ret);
goto fail_and_close;
}
return 0;
fail_and_close:
hid_hw_close(hdev);
fail_and_stop:
hid_hw_stop(hdev);
return ret;
}
static void kraken2_remove(struct hid_device *hdev)
{
struct kraken2_priv_data *priv = hid_get_drvdata(hdev);
hwmon_device_unregister(priv->hwmon_dev);
hid_hw_close(hdev);
hid_hw_stop(hdev);
}
static const struct hid_device_id kraken2_table[] = {
{ HID_USB_DEVICE(0x1e71, 0x170e) }, /* NZXT Kraken X42/X52/X62/X72 */
{ }
};
MODULE_DEVICE_TABLE(hid, kraken2_table);
static struct hid_driver kraken2_driver = {
.name = "nzxt-kraken2",
.id_table = kraken2_table,
.probe = kraken2_probe,
.remove = kraken2_remove,
.raw_event = kraken2_raw_event,
};
static int __init kraken2_init(void)
{
return hid_register_driver(&kraken2_driver);
}
static void __exit kraken2_exit(void)
{
hid_unregister_driver(&kraken2_driver);
}
/*
* When compiled into the kernel, initialize after the hid bus.
*/
late_initcall(kraken2_init);
module_exit(kraken2_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonas Malaco <jonas@protocubo.io>");
MODULE_DESCRIPTION("Hwmon driver for NZXT Kraken X42/X52/X62/X72 coolers");
|
