1 /*
2 * Airplane mode button for HP & Xiaomi laptops
3 *
4 * Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/input.h>
25 #include <linux/platform_device.h>
26 #include <linux/acpi.h>
27 #include <acpi/acpi_bus.h>
28
29 MODULE_LICENSE("GPL");
30 MODULE_AUTHOR("Alex Hung");
31 MODULE_ALIAS("acpi*:HPQ6001:*");
32 MODULE_ALIAS("acpi*:WSTADEF:*");
33
34 static struct input_dev *hpwl_input_dev;
35
36 static const struct acpi_device_id hpwl_ids[] = {
37 {"HPQ6001", 0},
38 {"WSTADEF", 0},
39 {"", 0},
40 };
41
hp_wireless_input_setup(void)42 static int hp_wireless_input_setup(void)
43 {
44 int err;
45
46 hpwl_input_dev = input_allocate_device();
47 if (!hpwl_input_dev)
48 return -ENOMEM;
49
50 hpwl_input_dev->name = "HP Wireless hotkeys";
51 hpwl_input_dev->phys = "hpq6001/input0";
52 hpwl_input_dev->id.bustype = BUS_HOST;
53 hpwl_input_dev->evbit[0] = BIT(EV_KEY);
54 set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
55
56 err = input_register_device(hpwl_input_dev);
57 if (err)
58 goto err_free_dev;
59
60 return 0;
61
62 err_free_dev:
63 input_free_device(hpwl_input_dev);
64 return err;
65 }
66
hp_wireless_input_destroy(void)67 static void hp_wireless_input_destroy(void)
68 {
69 input_unregister_device(hpwl_input_dev);
70 }
71
hpwl_notify(struct acpi_device * acpi_dev,u32 event)72 static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
73 {
74 if (event != 0x80) {
75 pr_info("Received unknown event (0x%x)\n", event);
76 return;
77 }
78
79 input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
80 input_sync(hpwl_input_dev);
81 input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
82 input_sync(hpwl_input_dev);
83 }
84
hpwl_add(struct acpi_device * device)85 static int hpwl_add(struct acpi_device *device)
86 {
87 int err;
88
89 err = hp_wireless_input_setup();
90 if (err)
91 pr_err("Failed to setup hp wireless hotkeys\n");
92
93 return err;
94 }
95
hpwl_remove(struct acpi_device * device)96 static int hpwl_remove(struct acpi_device *device)
97 {
98 hp_wireless_input_destroy();
99 return 0;
100 }
101
102 static struct acpi_driver hpwl_driver = {
103 .name = "hp-wireless",
104 .owner = THIS_MODULE,
105 .ids = hpwl_ids,
106 .ops = {
107 .add = hpwl_add,
108 .remove = hpwl_remove,
109 .notify = hpwl_notify,
110 },
111 };
112
113 module_acpi_driver(hpwl_driver);
114