tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* WMI driver for Xiaomi Laptops */
3
4#include <linux/acpi.h>
5#include <linux/device.h>
6#include <linux/input.h>
7#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/wmi.h>
10
11#include <uapi/linux/input-event-codes.h>
12
13#define XIAOMI_KEY_FN_ESC_0 "A2095CCE-0491-44E7-BA27-F8ED8F88AA86"
14#define XIAOMI_KEY_FN_ESC_1 "7BBE8E39-B486-473D-BA13-66F75C5805CD"
15#define XIAOMI_KEY_FN_FN "409B028D-F06B-4C7C-8BBB-EE133A6BD87E"
16#define XIAOMI_KEY_CAPSLOCK "83FE7607-053A-4644-822A-21532C621FC7"
17#define XIAOMI_KEY_FN_F7 "76E9027C-95D0-4180-8692-DA6747DD1C2D"
18
19#define XIAOMI_DEVICE(guid, key) \
20 .guid_string = (guid), \
21 .context = &(const unsigned int){key}
22
23struct xiaomi_wmi {
24 struct input_dev *input_dev;
25 struct mutex key_lock; /* Protects the key event sequence */
26 unsigned int key_code;
27};
28
29static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)
30{
31 struct xiaomi_wmi *data;
32 int ret;
33
34 if (!context)
35 return -EINVAL;
36
37 data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
38 if (data == NULL)
39 return -ENOMEM;
40 dev_set_drvdata(&wdev->dev, data);
41
42 ret = devm_mutex_init(&wdev->dev, &data->key_lock);
43 if (ret < 0)
44 return ret;
45
46 data->input_dev = devm_input_allocate_device(&wdev->dev);
47 if (data->input_dev == NULL)
48 return -ENOMEM;
49 data->input_dev->name = "Xiaomi WMI keys";
50 data->input_dev->phys = "wmi/input0";
51
52 data->key_code = *((const unsigned int *)context);
53 set_bit(EV_KEY, data->input_dev->evbit);
54 set_bit(data->key_code, data->input_dev->keybit);
55
56 return input_register_device(data->input_dev);
57}
58
59static void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
60{
61 struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev);
62
63 mutex_lock(&data->key_lock);
64 input_report_key(data->input_dev, data->key_code, 1);
65 input_sync(data->input_dev);
66 input_report_key(data->input_dev, data->key_code, 0);
67 input_sync(data->input_dev);
68 mutex_unlock(&data->key_lock);
69}
70
71static const struct wmi_device_id xiaomi_wmi_id_table[] = {
72 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },
73 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },
74 { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },
75 // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },
76 { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },
77
78 /* Terminating entry */
79 { }
80};
81
82static struct wmi_driver xiaomi_wmi_driver = {
83 .driver = {
84 .name = "xiaomi-wmi",
85 },
86 .id_table = xiaomi_wmi_id_table,
87 .probe = xiaomi_wmi_probe,
88 .notify = xiaomi_wmi_notify,
89 .no_singleton = true,
90};
91module_wmi_driver(xiaomi_wmi_driver);
92
93MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
94MODULE_AUTHOR("Mattias Jacobsson");
95MODULE_DESCRIPTION("Xiaomi WMI driver");
96MODULE_LICENSE("GPL v2");