1/*
2 * toshiba_wmi.c - Toshiba WMI Hotkey Driver
3 *
4 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.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 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/types.h>
24#include <linux/acpi.h>
25#include <linux/input.h>
26#include <linux/input/sparse-keymap.h>
27
28MODULE_AUTHOR("Azael Avalos");
29MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
30MODULE_LICENSE("GPL");
31
32#define TOSHIBA_WMI_EVENT_GUID	"59142400-C6A3-40FA-BADB-8A2652834100"
33
34MODULE_ALIAS("wmi:"TOSHIBA_WMI_EVENT_GUID);
35
36static struct input_dev *toshiba_wmi_input_dev;
37
38static const struct key_entry toshiba_wmi_keymap[] __initconst = {
39	/* TODO: Add keymap values once found... */
40	/*{ KE_KEY, 0x00, { KEY_ } },*/
41	{ KE_END, 0 }
42};
43
44static void toshiba_wmi_notify(u32 value, void *context)
45{
46	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
47	union acpi_object *obj;
48	acpi_status status;
49
50	status = wmi_get_event_data(value, &response);
51	if (ACPI_FAILURE(status)) {
52		pr_err("Bad event status 0x%x\n", status);
53		return;
54	}
55
56	obj = (union acpi_object *)response.pointer;
57	if (!obj)
58		return;
59
60	/* TODO: Add proper checks once we have data */
61	pr_debug("Unknown event received, obj type %x\n", obj->type);
62
63	kfree(response.pointer);
64}
65
66static int __init toshiba_wmi_input_setup(void)
67{
68	acpi_status status;
69	int err;
70
71	toshiba_wmi_input_dev = input_allocate_device();
72	if (!toshiba_wmi_input_dev)
73		return -ENOMEM;
74
75	toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
76	toshiba_wmi_input_dev->phys = "wmi/input0";
77	toshiba_wmi_input_dev->id.bustype = BUS_HOST;
78
79	err = sparse_keymap_setup(toshiba_wmi_input_dev,
80				  toshiba_wmi_keymap, NULL);
81	if (err)
82		goto err_free_dev;
83
84	status = wmi_install_notify_handler(TOSHIBA_WMI_EVENT_GUID,
85					    toshiba_wmi_notify, NULL);
86	if (ACPI_FAILURE(status)) {
87		err = -EIO;
88		goto err_free_keymap;
89	}
90
91	err = input_register_device(toshiba_wmi_input_dev);
92	if (err)
93		goto err_remove_notifier;
94
95	return 0;
96
97 err_remove_notifier:
98	wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
99 err_free_keymap:
100	sparse_keymap_free(toshiba_wmi_input_dev);
101 err_free_dev:
102	input_free_device(toshiba_wmi_input_dev);
103	return err;
104}
105
106static void toshiba_wmi_input_destroy(void)
107{
108	wmi_remove_notify_handler(TOSHIBA_WMI_EVENT_GUID);
109	sparse_keymap_free(toshiba_wmi_input_dev);
110	input_unregister_device(toshiba_wmi_input_dev);
111}
112
113static int __init toshiba_wmi_init(void)
114{
115	int ret;
116
117	if (!wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
118		return -ENODEV;
119
120	ret = toshiba_wmi_input_setup();
121	if (ret) {
122		pr_err("Failed to setup input device\n");
123		return ret;
124	}
125
126	pr_info("Toshiba WMI Hotkey Driver\n");
127
128	return 0;
129}
130
131static void __exit toshiba_wmi_exit(void)
132{
133	if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
134		toshiba_wmi_input_destroy();
135}
136
137module_init(toshiba_wmi_init);
138module_exit(toshiba_wmi_exit);
139