1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Airplane mode button for AMD, HP & Xiaomi laptops
4 *
5 * Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
6 * Copyright (C) 2021 Advanced Micro Devices
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/input.h>
13 #include <linux/platform_device.h>
14 #include <linux/acpi.h>
15 #include <acpi/acpi_bus.h>
16
17 MODULE_LICENSE("GPL");
18 MODULE_AUTHOR("Alex Hung");
19 MODULE_ALIAS("acpi*:HPQ6001:*");
20 MODULE_ALIAS("acpi*:WSTADEF:*");
21 MODULE_ALIAS("acpi*:AMDI0051:*");
22
23 static struct input_dev *wl_input_dev;
24
25 static const struct acpi_device_id wl_ids[] = {
26 {"HPQ6001", 0},
27 {"WSTADEF", 0},
28 {"AMDI0051", 0},
29 {"", 0},
30 };
31
wireless_input_setup(void)32 static int wireless_input_setup(void)
33 {
34 int err;
35
36 wl_input_dev = input_allocate_device();
37 if (!wl_input_dev)
38 return -ENOMEM;
39
40 wl_input_dev->name = "Wireless hotkeys";
41 wl_input_dev->phys = "hpq6001/input0";
42 wl_input_dev->id.bustype = BUS_HOST;
43 wl_input_dev->evbit[0] = BIT(EV_KEY);
44 set_bit(KEY_RFKILL, wl_input_dev->keybit);
45
46 err = input_register_device(wl_input_dev);
47 if (err)
48 goto err_free_dev;
49
50 return 0;
51
52 err_free_dev:
53 input_free_device(wl_input_dev);
54 return err;
55 }
56
wireless_input_destroy(void)57 static void wireless_input_destroy(void)
58 {
59 input_unregister_device(wl_input_dev);
60 }
61
wl_notify(struct acpi_device * acpi_dev,u32 event)62 static void wl_notify(struct acpi_device *acpi_dev, u32 event)
63 {
64 if (event != 0x80) {
65 pr_info("Received unknown event (0x%x)\n", event);
66 return;
67 }
68
69 input_report_key(wl_input_dev, KEY_RFKILL, 1);
70 input_sync(wl_input_dev);
71 input_report_key(wl_input_dev, KEY_RFKILL, 0);
72 input_sync(wl_input_dev);
73 }
74
wl_add(struct acpi_device * device)75 static int wl_add(struct acpi_device *device)
76 {
77 int err;
78
79 err = wireless_input_setup();
80 if (err)
81 pr_err("Failed to setup wireless hotkeys\n");
82
83 return err;
84 }
85
wl_remove(struct acpi_device * device)86 static int wl_remove(struct acpi_device *device)
87 {
88 wireless_input_destroy();
89 return 0;
90 }
91
92 static struct acpi_driver wl_driver = {
93 .name = "wireless-hotkey",
94 .owner = THIS_MODULE,
95 .ids = wl_ids,
96 .ops = {
97 .add = wl_add,
98 .remove = wl_remove,
99 .notify = wl_notify,
100 },
101 };
102
103 module_acpi_driver(wl_driver);
104