summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/hp-wireless.c
blob: 4e4cc8bd7557d75f4c7aa76ffd2ed734ad54699a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 *  hp-wireless button for Windows 8
 *
 *  Copyright (C) 2014 Alex Hung <alex.hung@canonical.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alex Hung");
MODULE_ALIAS("acpi*:HPQ6001:*");

static struct input_dev *hpwl_input_dev;

static const struct acpi_device_id hpwl_ids[] = {
	{"HPQ6001", 0},
	{"", 0},
};

static int hp_wireless_input_setup(void)
{
	int err;

	hpwl_input_dev = input_allocate_device();
	if (!hpwl_input_dev)
		return -ENOMEM;

	hpwl_input_dev->name = "HP Wireless hotkeys";
	hpwl_input_dev->phys = "hpq6001/input0";
	hpwl_input_dev->id.bustype = BUS_HOST;
	hpwl_input_dev->evbit[0] = BIT(EV_KEY);
	set_bit(KEY_RFKILL, hpwl_input_dev->keybit);

	err = input_register_device(hpwl_input_dev);
	if (err)
		goto err_free_dev;

	return 0;

err_free_dev:
	input_free_device(hpwl_input_dev);
	return err;
}

static void hp_wireless_input_destroy(void)
{
	input_unregister_device(hpwl_input_dev);
}

static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
{
	if (event != 0x80) {
		pr_info("Received unknown event (0x%x)\n", event);
		return;
	}

	input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
	input_sync(hpwl_input_dev);
	input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
	input_sync(hpwl_input_dev);
}

static int hpwl_add(struct acpi_device *device)
{
	int err;

	err = hp_wireless_input_setup();
	if (err)
		pr_err("Failed to setup hp wireless hotkeys\n");

	return err;
}

static int hpwl_remove(struct acpi_device *device)
{
	hp_wireless_input_destroy();
	return 0;
}

static struct acpi_driver hpwl_driver = {
	.name	= "hp-wireless",
	.owner	= THIS_MODULE,
	.ids	= hpwl_ids,
	.ops	= {
		.add	= hpwl_add,
		.remove	= hpwl_remove,
		.notify	= hpwl_notify,
	},
};

static int __init hpwl_init(void)
{
	int err;

	pr_info("Initializing HPQ6001 module\n");
	err = acpi_bus_register_driver(&hpwl_driver);
	if (err) {
		pr_err("Unable to register HP wireless control driver.\n");
		goto error_acpi_register;
	}

	return 0;

error_acpi_register:
	return err;
}

static void __exit hpwl_exit(void)
{
	pr_info("Exiting HPQ6001 module\n");
	acpi_bus_unregister_driver(&hpwl_driver);
}

module_init(hpwl_init);
module_exit(hpwl_exit);