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 device *dev)
39{
40 struct wl_button *button = dev_get_drvdata(dev);
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",
48 acpi_device_hid(ACPI_COMPANION(dev)));
49
50 button->input_dev->name = "Wireless hotkeys";
51 button->input_dev->phys = button->phys;
52 button->input_dev->id.bustype = BUS_HOST;
53 button->input_dev->evbit[0] = BIT(EV_KEY);
54 set_bit(KEY_RFKILL, button->input_dev->keybit);
55
56 err = input_register_device(button->input_dev);
57 if (err)
58 goto err_free_dev;
59
60 return 0;
61
62err_free_dev:
63 input_free_device(button->input_dev);
64 return err;
65}
66
67static void wireless_input_destroy(struct device *dev)
68{
69 struct wl_button *button = dev_get_drvdata(dev);
70
71 input_unregister_device(button->input_dev);
72 kfree(button);
73}
74
75static void wl_notify(acpi_handle handle, u32 event, void *data)
76{
77 struct wl_button *button = data;
78
79 if (event != 0x80) {
80 pr_info("Received unknown event (0x%x)\n", event);
81 return;
82 }
83
84 input_report_key(button->input_dev, KEY_RFKILL, 1);
85 input_sync(button->input_dev);
86 input_report_key(button->input_dev, KEY_RFKILL, 0);
87 input_sync(button->input_dev);
88}
89
90static int wl_probe(struct platform_device *pdev)
91{
92 struct wl_button *button;
93 int err;
94
95 button = kzalloc_obj(struct wl_button);
96 if (!button)
97 return -ENOMEM;
98
99 platform_set_drvdata(pdev, button);
100
101 err = wireless_input_setup(&pdev->dev);
102 if (err) {
103 pr_err("Failed to setup wireless hotkeys\n");
104 kfree(button);
105 return err;
106 }
107 err = acpi_dev_install_notify_handler(ACPI_COMPANION(&pdev->dev),
108 ACPI_DEVICE_NOTIFY, wl_notify, button);
109 if (err) {
110 pr_err("Failed to install ACPI notify handler\n");
111 wireless_input_destroy(&pdev->dev);
112 }
113
114 return err;
115}
116
117static void wl_remove(struct platform_device *pdev)
118{
119 acpi_dev_remove_notify_handler(ACPI_COMPANION(&pdev->dev),
120 ACPI_DEVICE_NOTIFY, wl_notify);
121 wireless_input_destroy(&pdev->dev);
122}
123
124static struct platform_driver wl_driver = {
125 .probe = wl_probe,
126 .remove = wl_remove,
127 .driver = {
128 .name = "wireless-hotkey",
129 .acpi_match_table = wl_ids,
130 },
131};
132
133module_platform_driver(wl_driver);