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(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
34	if (data == NULL)
35		return -ENOMEM;
36	dev_set_drvdata(&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, data->input_dev->evbit);
46	set_bit(data->key_code, 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(&wdev->dev);
59	if (data == NULL)
60		return;
61
62	input_report_key(data->input_dev, data->key_code, 1);
63	input_sync(data->input_dev);
64	input_report_key(data->input_dev, data->key_code, 0);
65	input_sync(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