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 MODULE_ALIAS("acpi*:LGEX0815:*");
23
24 struct wl_button {
25 struct input_dev *input_dev;
26 char phys[32];
27 };
28
29 static const struct acpi_device_id wl_ids[] = {
30 {"HPQ6001", 0},
31 {"WSTADEF", 0},
32 {"AMDI0051", 0},
33 {"LGEX0815", 0},
34 {"", 0},
35 };
36
wireless_input_setup(struct acpi_device * device)37 static int wireless_input_setup(struct acpi_device *device)
38 {
39 struct wl_button *button = acpi_driver_data(device);
40 int err;
41
42 button->input_dev = input_allocate_device();
43 if (!button->input_dev)
44 return -ENOMEM;
45
46 snprintf(button->phys, sizeof(button->phys), "%s/input0", acpi_device_hid(device));
47
48 button->input_dev->name = "Wireless hotkeys";
49 button->input_dev->phys = button->phys;
50 button->input_dev->id.bustype = BUS_HOST;
51 button->input_dev->evbit[0] = BIT(EV_KEY);
52 set_bit(KEY_RFKILL, button->input_dev->keybit);
53
54 err = input_register_device(button->input_dev);
55 if (err)
56 goto err_free_dev;
57
58 return 0;
59
60 err_free_dev:
61 input_free_device(button->input_dev);
62 return err;
63 }
64
wireless_input_destroy(struct acpi_device * device)65 static void wireless_input_destroy(struct acpi_device *device)
66 {
67 struct wl_button *button = acpi_driver_data(device);
68
69 input_unregister_device(button->input_dev);
70 kfree(button);
71 }
72
wl_notify(struct acpi_device * acpi_dev,u32 event)73 static void wl_notify(struct acpi_device *acpi_dev, u32 event)
74 {
75 struct wl_button *button = acpi_driver_data(acpi_dev);
76
77 if (event != 0x80) {
78 pr_info("Received unknown event (0x%x)\n", event);
79 return;
80 }
81
82 input_report_key(button->input_dev, KEY_RFKILL, 1);
83 input_sync(button->input_dev);
84 input_report_key(button->input_dev, KEY_RFKILL, 0);
85 input_sync(button->input_dev);
86 }
87
wl_add(struct acpi_device * device)88 static int wl_add(struct acpi_device *device)
89 {
90 struct wl_button *button;
91 int err;
92
93 button = kzalloc(sizeof(struct wl_button), GFP_KERNEL);
94 if (!button)
95 return -ENOMEM;
96
97 device->driver_data = button;
98
99 err = wireless_input_setup(device);
100 if (err) {
101 pr_err("Failed to setup wireless hotkeys\n");
102 kfree(button);
103 }
104
105 return err;
106 }
107
wl_remove(struct acpi_device * device)108 static void wl_remove(struct acpi_device *device)
109 {
110 wireless_input_destroy(device);
111 }
112
113 static struct acpi_driver wl_driver = {
114 .name = "wireless-hotkey",
115 .owner = THIS_MODULE,
116 .ids = wl_ids,
117 .ops = {
118 .add = wl_add,
119 .remove = wl_remove,
120 .notify = wl_notify,
121 },
122 };
123
124 module_acpi_driver(wl_driver);
125