1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Airplane mode button for HP & Xiaomi laptops
4 *
5 * Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/input.h>
12 #include <linux/platform_device.h>
13 #include <linux/acpi.h>
14 #include <acpi/acpi_bus.h>
15
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Alex Hung");
18 MODULE_ALIAS("acpi*:HPQ6001:*");
19 MODULE_ALIAS("acpi*:WSTADEF:*");
20
21 static struct input_dev *hpwl_input_dev;
22
23 static const struct acpi_device_id hpwl_ids[] = {
24 {"HPQ6001", 0},
25 {"WSTADEF", 0},
26 {"", 0},
27 };
28
hp_wireless_input_setup(void)29 static int hp_wireless_input_setup(void)
30 {
31 int err;
32
33 hpwl_input_dev = input_allocate_device();
34 if (!hpwl_input_dev)
35 return -ENOMEM;
36
37 hpwl_input_dev->name = "HP Wireless hotkeys";
38 hpwl_input_dev->phys = "hpq6001/input0";
39 hpwl_input_dev->id.bustype = BUS_HOST;
40 hpwl_input_dev->evbit[0] = BIT(EV_KEY);
41 set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
42
43 err = input_register_device(hpwl_input_dev);
44 if (err)
45 goto err_free_dev;
46
47 return 0;
48
49 err_free_dev:
50 input_free_device(hpwl_input_dev);
51 return err;
52 }
53
hp_wireless_input_destroy(void)54 static void hp_wireless_input_destroy(void)
55 {
56 input_unregister_device(hpwl_input_dev);
57 }
58
hpwl_notify(struct acpi_device * acpi_dev,u32 event)59 static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
60 {
61 if (event != 0x80) {
62 pr_info("Received unknown event (0x%x)\n", event);
63 return;
64 }
65
66 input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
67 input_sync(hpwl_input_dev);
68 input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
69 input_sync(hpwl_input_dev);
70 }
71
hpwl_add(struct acpi_device * device)72 static int hpwl_add(struct acpi_device *device)
73 {
74 int err;
75
76 err = hp_wireless_input_setup();
77 if (err)
78 pr_err("Failed to setup hp wireless hotkeys\n");
79
80 return err;
81 }
82
hpwl_remove(struct acpi_device * device)83 static int hpwl_remove(struct acpi_device *device)
84 {
85 hp_wireless_input_destroy();
86 return 0;
87 }
88
89 static struct acpi_driver hpwl_driver = {
90 .name = "hp-wireless",
91 .owner = THIS_MODULE,
92 .ids = hpwl_ids,
93 .ops = {
94 .add = hpwl_add,
95 .remove = hpwl_remove,
96 .notify = hpwl_notify,
97 },
98 };
99
100 module_acpi_driver(hpwl_driver);
101