1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * toshiba_wmi.c - Toshiba WMI Hotkey Driver
4 *
5 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/types.h>
14#include <linux/acpi.h>
15#include <linux/input.h>
16#include <linux/input/sparse-keymap.h>
17#include <linux/dmi.h>
18
19MODULE_AUTHOR("Azael Avalos");
20MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
21MODULE_LICENSE("GPL");
22
23#define WMI_EVENT_GUID	"59142400-C6A3-40FA-BADB-8A2652834100"
24
25MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
26
27static struct input_dev *toshiba_wmi_input_dev;
28
29static const struct key_entry toshiba_wmi_keymap[] __initconst = {
30	/* TODO: Add keymap values once found... */
31	/*{ KE_KEY, 0x00, { KEY_ } },*/
32	{ KE_END, 0 }
33};
34
35static void toshiba_wmi_notify(u32 value, void *context)
36{
37	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
38	union acpi_object *obj;
39	acpi_status status;
40
41	status = wmi_get_event_data(value, &response);
42	if (ACPI_FAILURE(status)) {
43		pr_err("Bad event status 0x%x\n", status);
44		return;
45	}
46
47	obj = (union acpi_object *)response.pointer;
48	if (!obj)
49		return;
50
51	/* TODO: Add proper checks once we have data */
52	pr_debug("Unknown event received, obj type %x\n", obj->type);
53
54	kfree(response.pointer);
55}
56
57static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
58	{
59		.ident = "Toshiba laptop",
60		.matches = {
61			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
62		},
63	},
64	{}
65};
66
67static int __init toshiba_wmi_input_setup(void)
68{
69	acpi_status status;
70	int err;
71
72	toshiba_wmi_input_dev = input_allocate_device();
73	if (!toshiba_wmi_input_dev)
74		return -ENOMEM;
75
76	toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
77	toshiba_wmi_input_dev->phys = "wmi/input0";
78	toshiba_wmi_input_dev->id.bustype = BUS_HOST;
79
80	err = sparse_keymap_setup(toshiba_wmi_input_dev,
81				  toshiba_wmi_keymap, NULL);
82	if (err)
83		goto err_free_dev;
84
85	status = wmi_install_notify_handler(WMI_EVENT_GUID,
86					    toshiba_wmi_notify, NULL);
87	if (ACPI_FAILURE(status)) {
88		err = -EIO;
89		goto err_free_dev;
90	}
91
92	err = input_register_device(toshiba_wmi_input_dev);
93	if (err)
94		goto err_remove_notifier;
95
96	return 0;
97
98 err_remove_notifier:
99	wmi_remove_notify_handler(WMI_EVENT_GUID);
100 err_free_dev:
101	input_free_device(toshiba_wmi_input_dev);
102	return err;
103}
104
105static void toshiba_wmi_input_destroy(void)
106{
107	wmi_remove_notify_handler(WMI_EVENT_GUID);
108	input_unregister_device(toshiba_wmi_input_dev);
109}
110
111static int __init toshiba_wmi_init(void)
112{
113	int ret;
114
115	if (!wmi_has_guid(WMI_EVENT_GUID) ||
116	    !dmi_check_system(toshiba_wmi_dmi_table))
117		return -ENODEV;
118
119	ret = toshiba_wmi_input_setup();
120	if (ret) {
121		pr_err("Failed to setup input device\n");
122		return ret;
123	}
124
125	pr_info("Toshiba WMI Hotkey Driver\n");
126
127	return 0;
128}
129
130static void __exit toshiba_wmi_exit(void)
131{
132	if (wmi_has_guid(WMI_EVENT_GUID))
133		toshiba_wmi_input_destroy();
134}
135
136module_init(toshiba_wmi_init);
137module_exit(toshiba_wmi_exit);
138