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

source code of linux/drivers/platform/x86/xiaomi-wmi.c