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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 | ||
28 | MODULE_AUTHOR("Azael Avalos"); | |
29 | MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | #define TOSHIBA_WMI_EVENT_GUID "59142400-C6A3-40FA-BADB-8A2652834100" | |
33 | ||
34 | MODULE_ALIAS("wmi:"TOSHIBA_WMI_EVENT_GUID); | |
35 | ||
36 | static struct input_dev *toshiba_wmi_input_dev; | |
37 | ||
38 | static 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 | ||
44 | static 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 | ||
66 | static 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 | ||
106 | static 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 | ||
113 | static 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 | ||
131 | static void __exit toshiba_wmi_exit(void) | |
132 | { | |
133 | if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID)) | |
134 | toshiba_wmi_input_destroy(); | |
135 | } | |
136 | ||
137 | module_init(toshiba_wmi_init); | |
138 | module_exit(toshiba_wmi_exit); |