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 | |
35 | static int wireless_input_setup(struct acpi_device *device) |
36 | { |
37 | struct wl_button *button = acpi_driver_data(d: device); |
38 | int err; |
39 | |
40 | button->input_dev = input_allocate_device(); |
41 | if (!button->input_dev) |
42 | return -ENOMEM; |
43 | |
44 | snprintf(buf: button->phys, size: sizeof(button->phys), fmt: "%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, addr: 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(dev: button->input_dev); |
60 | return err; |
61 | } |
62 | |
63 | static void wireless_input_destroy(struct acpi_device *device) |
64 | { |
65 | struct wl_button *button = acpi_driver_data(d: device); |
66 | |
67 | input_unregister_device(button->input_dev); |
68 | kfree(objp: button); |
69 | } |
70 | |
71 | static void wl_notify(struct acpi_device *acpi_dev, u32 event) |
72 | { |
73 | struct wl_button *button = acpi_driver_data(d: 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(dev: button->input_dev, KEY_RFKILL, value: 1); |
81 | input_sync(dev: button->input_dev); |
82 | input_report_key(dev: button->input_dev, KEY_RFKILL, value: 0); |
83 | input_sync(dev: button->input_dev); |
84 | } |
85 | |
86 | static int wl_add(struct acpi_device *device) |
87 | { |
88 | struct wl_button *button; |
89 | int err; |
90 | |
91 | button = kzalloc(size: 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(objp: button); |
101 | } |
102 | |
103 | return err; |
104 | } |
105 | |
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 | |