tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
17MODULE_DESCRIPTION("Airplane mode button for AMD, HP & Xiaomi laptops");
18MODULE_LICENSE("GPL");
19MODULE_AUTHOR("Alex Hung");
20MODULE_ALIAS("acpi*:HPQ6001:*");
21MODULE_ALIAS("acpi*:WSTADEF:*");
22MODULE_ALIAS("acpi*:AMDI0051:*");
23MODULE_ALIAS("acpi*:LGEX0815:*");
24
25struct wl_button {
26 struct input_dev *input_dev;
27 char phys[32];
28};
29
30static const struct acpi_device_id wl_ids[] = {
31 {"HPQ6001", 0},
32 {"WSTADEF", 0},
33 {"AMDI0051", 0},
34 {"LGEX0815", 0},
35 {"", 0},
36};
37
38static int wireless_input_setup(struct acpi_device *device)
39{
40 struct wl_button *button = acpi_driver_data(device);
41 int err;
42
43 button->input_dev = input_allocate_device();
44 if (!button->input_dev)
45 return -ENOMEM;
46
47 snprintf(button->phys, sizeof(button->phys), "%s/input0", acpi_device_hid(device));
48
49 button->input_dev->name = "Wireless hotkeys";
50 button->input_dev->phys = button->phys;
51 button->input_dev->id.bustype = BUS_HOST;
52 button->input_dev->evbit[0] = BIT(EV_KEY);
53 set_bit(KEY_RFKILL, button->input_dev->keybit);
54
55 err = input_register_device(button->input_dev);
56 if (err)
57 goto err_free_dev;
58
59 return 0;
60
61err_free_dev:
62 input_free_device(button->input_dev);
63 return err;
64}
65
66static void wireless_input_destroy(struct acpi_device *device)
67{
68 struct wl_button *button = acpi_driver_data(device);
69
70 input_unregister_device(button->input_dev);
71 kfree(button);
72}
73
74static void wl_notify(struct acpi_device *acpi_dev, u32 event)
75{
76 struct wl_button *button = acpi_driver_data(acpi_dev);
77
78 if (event != 0x80) {
79 pr_info("Received unknown event (0x%x)\n", event);
80 return;
81 }
82
83 input_report_key(button->input_dev, KEY_RFKILL, 1);
84 input_sync(button->input_dev);
85 input_report_key(button->input_dev, KEY_RFKILL, 0);
86 input_sync(button->input_dev);
87}
88
89static int wl_add(struct acpi_device *device)
90{
91 struct wl_button *button;
92 int err;
93
94 button = kzalloc(sizeof(struct wl_button), GFP_KERNEL);
95 if (!button)
96 return -ENOMEM;
97
98 device->driver_data = button;
99
100 err = wireless_input_setup(device);
101 if (err) {
102 pr_err("Failed to setup wireless hotkeys\n");
103 kfree(button);
104 }
105
106 return err;
107}
108
109static void wl_remove(struct acpi_device *device)
110{
111 wireless_input_destroy(device);
112}
113
114static struct acpi_driver wl_driver = {
115 .name = "wireless-hotkey",
116 .ids = wl_ids,
117 .ops = {
118 .add = wl_add,
119 .remove = wl_remove,
120 .notify = wl_notify,
121 },
122};
123
124module_acpi_driver(wl_driver);