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 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
16MODULE_LICENSE("GPL");
17MODULE_AUTHOR("Alex Hung");
18MODULE_ALIAS("acpi*:HPQ6001:*");
19MODULE_ALIAS("acpi*:WSTADEF:*");
20
21static struct input_dev *hpwl_input_dev;
22
23static const struct acpi_device_id hpwl_ids[] = {
24 {"HPQ6001", 0},
25 {"WSTADEF", 0},
26 {"", 0},
27};
28
29static 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
49err_free_dev:
50 input_free_device(hpwl_input_dev);
51 return err;
52}
53
54static void hp_wireless_input_destroy(void)
55{
56 input_unregister_device(hpwl_input_dev);
57}
58
59static 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
72static 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
83static int hpwl_remove(struct acpi_device *device)
84{
85 hp_wireless_input_destroy();
86 return 0;
87}
88
89static 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
100module_acpi_driver(hpwl_driver);