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:*");
20MODULE_ALIAS("acpi*:AMDI0051:*");
21
22static struct input_dev *hpwl_input_dev;
23
24static const struct acpi_device_id hpwl_ids[] = {
25	{"HPQ6001", 0},
26	{"WSTADEF", 0},
27	{"AMDI0051", 0},
28	{"", 0},
29};
30
31static int hp_wireless_input_setup(void)
32{
33	int err;
34
35	hpwl_input_dev = input_allocate_device();
36	if (!hpwl_input_dev)
37		return -ENOMEM;
38
39	hpwl_input_dev->name = "HP Wireless hotkeys";
40	hpwl_input_dev->phys = "hpq6001/input0";
41	hpwl_input_dev->id.bustype = BUS_HOST;
42	hpwl_input_dev->evbit[0] = BIT(EV_KEY);
43	set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
44
45	err = input_register_device(hpwl_input_dev);
46	if (err)
47		goto err_free_dev;
48
49	return 0;
50
51err_free_dev:
52	input_free_device(hpwl_input_dev);
53	return err;
54}
55
56static void hp_wireless_input_destroy(void)
57{
58	input_unregister_device(hpwl_input_dev);
59}
60
61static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
62{
63	if (event != 0x80) {
64		pr_info("Received unknown event (0x%x)\n", event);
65		return;
66	}
67
68	input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
69	input_sync(hpwl_input_dev);
70	input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
71	input_sync(hpwl_input_dev);
72}
73
74static int hpwl_add(struct acpi_device *device)
75{
76	int err;
77
78	err = hp_wireless_input_setup();
79	if (err)
80		pr_err("Failed to setup hp wireless hotkeys\n");
81
82	return err;
83}
84
85static int hpwl_remove(struct acpi_device *device)
86{
87	hp_wireless_input_destroy();
88	return 0;
89}
90
91static struct acpi_driver hpwl_driver = {
92	.name	= "hp-wireless",
93	.owner	= THIS_MODULE,
94	.ids	= hpwl_ids,
95	.ops	= {
96		.add	= hpwl_add,
97		.remove	= hpwl_remove,
98		.notify	= hpwl_notify,
99	},
100};
101
102module_acpi_driver(hpwl_driver);
103