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820787fc CIK |
1 | /* |
2 | * WMI hotkeys support for Dell All-In-One series | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
eb889524 | 18 | |
820787fc CIK |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/input.h> | |
26 | #include <linux/input/sparse-keymap.h> | |
820787fc CIK |
27 | #include <linux/acpi.h> |
28 | #include <linux/string.h> | |
29 | ||
30 | MODULE_DESCRIPTION("WMI hotkeys driver for Dell All-In-One series"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | #define EVENT_GUID1 "284A0E6B-380E-472A-921F-E52786257FB4" | |
34 | #define EVENT_GUID2 "02314822-307C-4F66-BF0E-48AEAEB26CC8" | |
35 | ||
5dd760b8 AK |
36 | struct dell_wmi_event { |
37 | u16 length; | |
38 | /* 0x000: A hot key pressed or an event occurred | |
39 | * 0x00F: A sequence of hot keys are pressed */ | |
40 | u16 type; | |
41 | u16 event[]; | |
42 | }; | |
43 | ||
820787fc CIK |
44 | static const char *dell_wmi_aio_guids[] = { |
45 | EVENT_GUID1, | |
46 | EVENT_GUID2, | |
47 | NULL | |
48 | }; | |
49 | ||
50 | MODULE_ALIAS("wmi:"EVENT_GUID1); | |
51 | MODULE_ALIAS("wmi:"EVENT_GUID2); | |
52 | ||
53 | static const struct key_entry dell_wmi_aio_keymap[] = { | |
54 | { KE_KEY, 0xc0, { KEY_VOLUMEUP } }, | |
55 | { KE_KEY, 0xc1, { KEY_VOLUMEDOWN } }, | |
5dd760b8 AK |
56 | { KE_KEY, 0xe030, { KEY_VOLUMEUP } }, |
57 | { KE_KEY, 0xe02e, { KEY_VOLUMEDOWN } }, | |
58 | { KE_KEY, 0xe020, { KEY_MUTE } }, | |
59 | { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } }, | |
60 | { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, | |
61 | { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, | |
62 | { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, | |
820787fc CIK |
63 | { KE_END, 0 } |
64 | }; | |
65 | ||
66 | static struct input_dev *dell_wmi_aio_input_dev; | |
67 | ||
5dd760b8 AK |
68 | /* |
69 | * The new WMI event data format will follow the dell_wmi_event structure | |
70 | * So, we will check if the buffer matches the format | |
71 | */ | |
72 | static bool dell_wmi_aio_event_check(u8 *buffer, int length) | |
73 | { | |
74 | struct dell_wmi_event *event = (struct dell_wmi_event *)buffer; | |
75 | ||
76 | if (event == NULL || length < 6) | |
77 | return false; | |
78 | ||
79 | if ((event->type == 0 || event->type == 0xf) && | |
80 | event->length >= 2) | |
81 | return true; | |
82 | ||
83 | return false; | |
84 | } | |
85 | ||
820787fc CIK |
86 | static void dell_wmi_aio_notify(u32 value, void *context) |
87 | { | |
88 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
89 | union acpi_object *obj; | |
5dd760b8 | 90 | struct dell_wmi_event *event; |
820787fc CIK |
91 | acpi_status status; |
92 | ||
93 | status = wmi_get_event_data(value, &response); | |
94 | if (status != AE_OK) { | |
95 | pr_info("bad event status 0x%x\n", status); | |
96 | return; | |
97 | } | |
98 | ||
99 | obj = (union acpi_object *)response.pointer; | |
100 | if (obj) { | |
5dd760b8 | 101 | unsigned int scancode = 0; |
820787fc CIK |
102 | |
103 | switch (obj->type) { | |
104 | case ACPI_TYPE_INTEGER: | |
105 | /* Most All-In-One correctly return integer scancode */ | |
106 | scancode = obj->integer.value; | |
107 | sparse_keymap_report_event(dell_wmi_aio_input_dev, | |
108 | scancode, 1, true); | |
109 | break; | |
110 | case ACPI_TYPE_BUFFER: | |
5dd760b8 AK |
111 | if (dell_wmi_aio_event_check(obj->buffer.pointer, |
112 | obj->buffer.length)) { | |
113 | event = (struct dell_wmi_event *) | |
114 | obj->buffer.pointer; | |
115 | scancode = event->event[0]; | |
116 | } else { | |
117 | /* Broken machines return the scancode in a | |
118 | buffer */ | |
119 | if (obj->buffer.pointer && | |
120 | obj->buffer.length > 0) | |
121 | scancode = obj->buffer.pointer[0]; | |
122 | } | |
123 | if (scancode) | |
820787fc CIK |
124 | sparse_keymap_report_event( |
125 | dell_wmi_aio_input_dev, | |
126 | scancode, 1, true); | |
820787fc CIK |
127 | break; |
128 | } | |
129 | } | |
130 | kfree(obj); | |
131 | } | |
132 | ||
133 | static int __init dell_wmi_aio_input_setup(void) | |
134 | { | |
135 | int err; | |
136 | ||
137 | dell_wmi_aio_input_dev = input_allocate_device(); | |
138 | ||
139 | if (!dell_wmi_aio_input_dev) | |
140 | return -ENOMEM; | |
141 | ||
142 | dell_wmi_aio_input_dev->name = "Dell AIO WMI hotkeys"; | |
143 | dell_wmi_aio_input_dev->phys = "wmi/input0"; | |
144 | dell_wmi_aio_input_dev->id.bustype = BUS_HOST; | |
145 | ||
146 | err = sparse_keymap_setup(dell_wmi_aio_input_dev, | |
147 | dell_wmi_aio_keymap, NULL); | |
148 | if (err) { | |
149 | pr_err("Unable to setup input device keymap\n"); | |
150 | goto err_free_dev; | |
151 | } | |
152 | err = input_register_device(dell_wmi_aio_input_dev); | |
153 | if (err) { | |
154 | pr_info("Unable to register input device\n"); | |
155 | goto err_free_keymap; | |
156 | } | |
157 | return 0; | |
158 | ||
159 | err_free_keymap: | |
160 | sparse_keymap_free(dell_wmi_aio_input_dev); | |
161 | err_free_dev: | |
162 | input_free_device(dell_wmi_aio_input_dev); | |
163 | return err; | |
164 | } | |
165 | ||
166 | static const char *dell_wmi_aio_find(void) | |
167 | { | |
168 | int i; | |
169 | ||
170 | for (i = 0; dell_wmi_aio_guids[i] != NULL; i++) | |
171 | if (wmi_has_guid(dell_wmi_aio_guids[i])) | |
172 | return dell_wmi_aio_guids[i]; | |
173 | ||
174 | return NULL; | |
175 | } | |
176 | ||
177 | static int __init dell_wmi_aio_init(void) | |
178 | { | |
179 | int err; | |
180 | const char *guid; | |
181 | ||
182 | guid = dell_wmi_aio_find(); | |
183 | if (!guid) { | |
eb889524 | 184 | pr_warn("No known WMI GUID found\n"); |
820787fc CIK |
185 | return -ENXIO; |
186 | } | |
187 | ||
188 | err = dell_wmi_aio_input_setup(); | |
189 | if (err) | |
190 | return err; | |
191 | ||
192 | err = wmi_install_notify_handler(guid, dell_wmi_aio_notify, NULL); | |
193 | if (err) { | |
194 | pr_err("Unable to register notify handler - %d\n", err); | |
195 | sparse_keymap_free(dell_wmi_aio_input_dev); | |
196 | input_unregister_device(dell_wmi_aio_input_dev); | |
197 | return err; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static void __exit dell_wmi_aio_exit(void) | |
204 | { | |
205 | const char *guid; | |
206 | ||
207 | guid = dell_wmi_aio_find(); | |
208 | wmi_remove_notify_handler(guid); | |
209 | sparse_keymap_free(dell_wmi_aio_input_dev); | |
210 | input_unregister_device(dell_wmi_aio_input_dev); | |
211 | } | |
212 | ||
213 | module_init(dell_wmi_aio_init); | |
214 | module_exit(dell_wmi_aio_exit); |