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 struct wl_button {
24 struct input_dev *input_dev;
25 char phys[32];
26 };
27
28 static const struct acpi_device_id wl_ids[] = {
29 {"HPQ6001", 0},
30 {"WSTADEF", 0},
31 {"AMDI0051", 0},
32 {"", 0},
33 };
34
wireless_input_setup(struct acpi_device * device)35 static int wireless_input_setup(struct acpi_device *device)
36 {
37 struct wl_button *button = acpi_driver_data(device);
38 int err;
39
40 button->input_dev = input_allocate_device();
41 if (!button->input_dev)
42 return -ENOMEM;
43
44 snprintf(button->phys, sizeof(button->phys), "%s/input0", acpi_device_hid(device));
45
46 button->input_dev->name = "Wireless hotkeys";
47 button->input_dev->phys = button->phys;
48 button->input_dev->id.bustype = BUS_HOST;
49 button->input_dev->evbit[0] = BIT(EV_KEY);
50 set_bit(KEY_RFKILL, button->input_dev->keybit);
51
52 err = input_register_device(button->input_dev);
53 if (err)
54 goto err_free_dev;
55
56 return 0;
57
58 err_free_dev:
59 input_free_device(button->input_dev);
60 return err;
61 }
62
wireless_input_destroy(struct acpi_device * device)63 static void wireless_input_destroy(struct acpi_device *device)
64 {
65 struct wl_button *button = acpi_driver_data(device);
66
67 input_unregister_device(button->input_dev);
68 kfree(button);
69 }
70
wl_notify(struct acpi_device * acpi_dev,u32 event)71 static void wl_notify(struct acpi_device *acpi_dev, u32 event)
72 {
73 struct wl_button *button = acpi_driver_data(acpi_dev);
74
75 if (event != 0x80) {
76 pr_info("Received unknown event (0x%x)\n", event);
77 return;
78 }
79
80 input_report_key(button->input_dev, KEY_RFKILL, 1);
81 input_sync(button->input_dev);
82 input_report_key(button->input_dev, KEY_RFKILL, 0);
83 input_sync(button->input_dev);
84 }
85
wl_add(struct acpi_device * device)86 static int wl_add(struct acpi_device *device)
87 {
88 struct wl_button *button;
89 int err;
90
91 button = kzalloc(sizeof(struct wl_button), GFP_KERNEL);
92 if (!button)
93 return -ENOMEM;
94
95 device->driver_data = button;
96
97 err = wireless_input_setup(device);
98 if (err) {
99 pr_err("Failed to setup wireless hotkeys\n");
100 kfree(button);
101 }
102
103 return err;
104 }
105
wl_remove(struct acpi_device * device)106 static void wl_remove(struct acpi_device *device)
107 {
108 wireless_input_destroy(device);
109 }
110
111 static struct acpi_driver wl_driver = {
112 .name = "wireless-hotkey",
113 .owner = THIS_MODULE,
114 .ids = wl_ids,
115 .ops = {
116 .add = wl_add,
117 .remove = wl_remove,
118 .notify = wl_notify,
119 },
120 };
121
122 module_acpi_driver(wl_driver);
123