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 void xiaomi_mutex_destroy(void *data)
30{
31	struct mutex *lock = data;
32
33	mutex_destroy(lock);
34}
35
36static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)
37{
38	struct xiaomi_wmi *data;
39	int ret;
40
41	if (!context)
42		return -EINVAL;
43
44	data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
45	if (data == NULL)
46		return -ENOMEM;
47	dev_set_drvdata(&wdev->dev, data);
48
49	mutex_init(&data->key_lock);
50	ret = devm_add_action_or_reset(&wdev->dev, xiaomi_mutex_destroy, &data->key_lock);
51	if (ret < 0)
52		return ret;
53
54	data->input_dev = devm_input_allocate_device(&wdev->dev);
55	if (data->input_dev == NULL)
56		return -ENOMEM;
57	data->input_dev->name = "Xiaomi WMI keys";
58	data->input_dev->phys = "wmi/input0";
59
60	data->key_code = *((const unsigned int *)context);
61	set_bit(EV_KEY, data->input_dev->evbit);
62	set_bit(data->key_code, data->input_dev->keybit);
63
64	return input_register_device(data->input_dev);
65}
66
67static void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
68{
69	struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev);
70
71	mutex_lock(&data->key_lock);
72	input_report_key(data->input_dev, data->key_code, 1);
73	input_sync(data->input_dev);
74	input_report_key(data->input_dev, data->key_code, 0);
75	input_sync(data->input_dev);
76	mutex_unlock(&data->key_lock);
77}
78
79static const struct wmi_device_id xiaomi_wmi_id_table[] = {
80	// { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },
81	// { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },
82	{ XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },
83	// { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },
84	{ XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },
85
86	/* Terminating entry */
87	{ }
88};
89
90static struct wmi_driver xiaomi_wmi_driver = {
91	.driver = {
92		.name = "xiaomi-wmi",
93	},
94	.id_table = xiaomi_wmi_id_table,
95	.probe = xiaomi_wmi_probe,
96	.notify = xiaomi_wmi_notify,
97	.no_singleton = true,
98};
99module_wmi_driver(xiaomi_wmi_driver);
100
101MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
102MODULE_AUTHOR("Mattias Jacobsson");
103MODULE_DESCRIPTION("Xiaomi WMI driver");
104MODULE_LICENSE("GPL v2");
105