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1/*
2 * MSI WMI hotkeys
3 *
4 * Copyright (C) 2009 Novell <trenn@suse.de>
5 *
6 * Most stuff taken over from hp-wmi
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/kernel.h>
26#include <linux/input.h>
27#include <linux/input/sparse-keymap.h>
28#include <linux/acpi.h>
29#include <linux/backlight.h>
30#include <linux/slab.h>
31#include <linux/module.h>
32#include <acpi/video.h>
33
34MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
35MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
36MODULE_LICENSE("GPL");
37
38#define DRV_NAME "msi-wmi"
39
40#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
41#define MSIWMI_MSI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
42#define MSIWMI_WIND_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
43
44MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
45MODULE_ALIAS("wmi:" MSIWMI_MSI_EVENT_GUID);
46MODULE_ALIAS("wmi:" MSIWMI_WIND_EVENT_GUID);
47
48enum msi_scancodes {
49 /* Generic MSI keys (not present on MSI Wind) */
50 MSI_KEY_BRIGHTNESSUP = 0xD0,
51 MSI_KEY_BRIGHTNESSDOWN,
52 MSI_KEY_VOLUMEUP,
53 MSI_KEY_VOLUMEDOWN,
54 MSI_KEY_MUTE,
55 /* MSI Wind keys */
56 WIND_KEY_TOUCHPAD = 0x08, /* Fn+F3 touchpad toggle */
57 WIND_KEY_BLUETOOTH = 0x56, /* Fn+F11 Bluetooth toggle */
58 WIND_KEY_CAMERA, /* Fn+F6 webcam toggle */
59 WIND_KEY_WLAN = 0x5f, /* Fn+F11 Wi-Fi toggle */
60 WIND_KEY_TURBO, /* Fn+F10 turbo mode toggle */
61 WIND_KEY_ECO = 0x69, /* Fn+F10 ECO mode toggle */
62};
63static struct key_entry msi_wmi_keymap[] = {
64 { KE_KEY, MSI_KEY_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
65 { KE_KEY, MSI_KEY_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
66 { KE_KEY, MSI_KEY_VOLUMEUP, {KEY_VOLUMEUP} },
67 { KE_KEY, MSI_KEY_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
68 { KE_KEY, MSI_KEY_MUTE, {KEY_MUTE} },
69
70 /* These keys work without WMI. Ignore them to avoid double keycodes */
71 { KE_IGNORE, WIND_KEY_TOUCHPAD, {KEY_TOUCHPAD_TOGGLE} },
72 { KE_IGNORE, WIND_KEY_BLUETOOTH, {KEY_BLUETOOTH} },
73 { KE_IGNORE, WIND_KEY_CAMERA, {KEY_CAMERA} },
74 { KE_IGNORE, WIND_KEY_WLAN, {KEY_WLAN} },
75
76 /* These are unknown WMI events found on MSI Wind */
77 { KE_IGNORE, 0x00 },
78 { KE_IGNORE, 0x62 },
79 { KE_IGNORE, 0x63 },
80
81 /* These are MSI Wind keys that should be handled via WMI */
82 { KE_KEY, WIND_KEY_TURBO, {KEY_PROG1} },
83 { KE_KEY, WIND_KEY_ECO, {KEY_PROG2} },
84
85 { KE_END, 0 }
86};
87
88static ktime_t last_pressed;
89
90static const struct {
91 const char *guid;
92 bool quirk_last_pressed;
93} *event_wmi, event_wmis[] = {
94 { MSIWMI_MSI_EVENT_GUID, true },
95 { MSIWMI_WIND_EVENT_GUID, false },
96};
97
98static struct backlight_device *backlight;
99
100static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
101
102static struct input_dev *msi_wmi_input_dev;
103
104static int msi_wmi_query_block(int instance, int *ret)
105{
106 acpi_status status;
107 union acpi_object *obj;
108
109 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
110
111 status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
112
113 obj = output.pointer;
114
115 if (!obj || obj->type != ACPI_TYPE_INTEGER) {
116 if (obj) {
117 pr_err("query block returned object "
118 "type: %d - buffer length:%d\n", obj->type,
119 obj->type == ACPI_TYPE_BUFFER ?
120 obj->buffer.length : 0);
121 }
122 kfree(obj);
123 return -EINVAL;
124 }
125 *ret = obj->integer.value;
126 kfree(obj);
127 return 0;
128}
129
130static int msi_wmi_set_block(int instance, int value)
131{
132 acpi_status status;
133
134 struct acpi_buffer input = { sizeof(int), &value };
135
136 pr_debug("Going to set block of instance: %d - value: %d\n",
137 instance, value);
138
139 status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
140
141 return ACPI_SUCCESS(status) ? 0 : 1;
142}
143
144static int bl_get(struct backlight_device *bd)
145{
146 int level, err, ret;
147
148 /* Instance 1 is "get backlight", cmp with DSDT */
149 err = msi_wmi_query_block(1, &ret);
150 if (err) {
151 pr_err("Could not query backlight: %d\n", err);
152 return -EINVAL;
153 }
154 pr_debug("Get: Query block returned: %d\n", ret);
155 for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
156 if (backlight_map[level] == ret) {
157 pr_debug("Current backlight level: 0x%X - index: %d\n",
158 backlight_map[level], level);
159 break;
160 }
161 }
162 if (level == ARRAY_SIZE(backlight_map)) {
163 pr_err("get: Invalid brightness value: 0x%X\n", ret);
164 return -EINVAL;
165 }
166 return level;
167}
168
169static int bl_set_status(struct backlight_device *bd)
170{
171 int bright = bd->props.brightness;
172 if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
173 return -EINVAL;
174
175 /* Instance 0 is "set backlight" */
176 return msi_wmi_set_block(0, backlight_map[bright]);
177}
178
179static const struct backlight_ops msi_backlight_ops = {
180 .get_brightness = bl_get,
181 .update_status = bl_set_status,
182};
183
184static void msi_wmi_notify(u32 value, void *context)
185{
186 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
187 static struct key_entry *key;
188 union acpi_object *obj;
189 acpi_status status;
190
191 status = wmi_get_event_data(value, &response);
192 if (status != AE_OK) {
193 pr_info("bad event status 0x%x\n", status);
194 return;
195 }
196
197 obj = (union acpi_object *)response.pointer;
198
199 if (obj && obj->type == ACPI_TYPE_INTEGER) {
200 int eventcode = obj->integer.value;
201 pr_debug("Eventcode: 0x%x\n", eventcode);
202 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
203 eventcode);
204 if (!key) {
205 pr_info("Unknown key pressed - %x\n", eventcode);
206 goto msi_wmi_notify_exit;
207 }
208
209 if (event_wmi->quirk_last_pressed) {
210 ktime_t cur = ktime_get_real();
211 ktime_t diff = ktime_sub(cur, last_pressed);
212 /* Ignore event if any event happened in a 50 ms
213 timeframe -> Key press may result in 10-20 GPEs */
214 if (ktime_to_us(diff) < 1000 * 50) {
215 pr_debug("Suppressed key event 0x%X - "
216 "Last press was %lld us ago\n",
217 key->code, ktime_to_us(diff));
218 goto msi_wmi_notify_exit;
219 }
220 last_pressed = cur;
221 }
222
223 if (key->type == KE_KEY &&
224 /* Brightness is served via acpi video driver */
225 (backlight ||
226 (key->code != MSI_KEY_BRIGHTNESSUP &&
227 key->code != MSI_KEY_BRIGHTNESSDOWN))) {
228 pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
229 key->code, key->keycode);
230 sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
231 true);
232 }
233 } else
234 pr_info("Unknown event received\n");
235
236msi_wmi_notify_exit:
237 kfree(response.pointer);
238}
239
240static int __init msi_wmi_backlight_setup(void)
241{
242 int err;
243 struct backlight_properties props;
244
245 memset(&props, 0, sizeof(struct backlight_properties));
246 props.type = BACKLIGHT_PLATFORM;
247 props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
248 backlight = backlight_device_register(DRV_NAME, NULL, NULL,
249 &msi_backlight_ops,
250 &props);
251 if (IS_ERR(backlight))
252 return PTR_ERR(backlight);
253
254 err = bl_get(NULL);
255 if (err < 0) {
256 backlight_device_unregister(backlight);
257 return err;
258 }
259
260 backlight->props.brightness = err;
261
262 return 0;
263}
264
265static int __init msi_wmi_input_setup(void)
266{
267 int err;
268
269 msi_wmi_input_dev = input_allocate_device();
270 if (!msi_wmi_input_dev)
271 return -ENOMEM;
272
273 msi_wmi_input_dev->name = "MSI WMI hotkeys";
274 msi_wmi_input_dev->phys = "wmi/input0";
275 msi_wmi_input_dev->id.bustype = BUS_HOST;
276
277 err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
278 if (err)
279 goto err_free_dev;
280
281 err = input_register_device(msi_wmi_input_dev);
282
283 if (err)
284 goto err_free_keymap;
285
286 last_pressed = ktime_set(0, 0);
287
288 return 0;
289
290err_free_keymap:
291 sparse_keymap_free(msi_wmi_input_dev);
292err_free_dev:
293 input_free_device(msi_wmi_input_dev);
294 return err;
295}
296
297static int __init msi_wmi_init(void)
298{
299 int err;
300 int i;
301
302 for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
303 if (!wmi_has_guid(event_wmis[i].guid))
304 continue;
305
306 err = msi_wmi_input_setup();
307 if (err) {
308 pr_err("Unable to setup input device\n");
309 return err;
310 }
311
312 err = wmi_install_notify_handler(event_wmis[i].guid,
313 msi_wmi_notify, NULL);
314 if (ACPI_FAILURE(err)) {
315 pr_err("Unable to setup WMI notify handler\n");
316 goto err_free_input;
317 }
318
319 pr_debug("Event handler installed\n");
320 event_wmi = &event_wmis[i];
321 break;
322 }
323
324 if (wmi_has_guid(MSIWMI_BIOS_GUID) &&
325 acpi_video_get_backlight_type() == acpi_backlight_vendor) {
326 err = msi_wmi_backlight_setup();
327 if (err) {
328 pr_err("Unable to setup backlight device\n");
329 goto err_uninstall_handler;
330 }
331 pr_debug("Backlight device created\n");
332 }
333
334 if (!event_wmi && !backlight) {
335 pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
336 return -ENODEV;
337 }
338
339 return 0;
340
341err_uninstall_handler:
342 if (event_wmi)
343 wmi_remove_notify_handler(event_wmi->guid);
344err_free_input:
345 if (event_wmi) {
346 sparse_keymap_free(msi_wmi_input_dev);
347 input_unregister_device(msi_wmi_input_dev);
348 }
349 return err;
350}
351
352static void __exit msi_wmi_exit(void)
353{
354 if (event_wmi) {
355 wmi_remove_notify_handler(event_wmi->guid);
356 sparse_keymap_free(msi_wmi_input_dev);
357 input_unregister_device(msi_wmi_input_dev);
358 }
359 backlight_device_unregister(backlight);
360}
361
362module_init(msi_wmi_init);
363module_exit(msi_wmi_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MSI WMI hotkeys
4 *
5 * Copyright (C) 2009 Novell <trenn@suse.de>
6 *
7 * Most stuff taken over from hp-wmi
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/input.h>
14#include <linux/input/sparse-keymap.h>
15#include <linux/acpi.h>
16#include <linux/backlight.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <acpi/video.h>
20
21MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
22MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
23MODULE_LICENSE("GPL");
24
25#define DRV_NAME "msi-wmi"
26
27#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
28#define MSIWMI_MSI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
29#define MSIWMI_WIND_EVENT_GUID "5B3CC38A-40D9-7245-8AE6-1145B751BE3F"
30
31MODULE_ALIAS("wmi:" MSIWMI_BIOS_GUID);
32MODULE_ALIAS("wmi:" MSIWMI_MSI_EVENT_GUID);
33MODULE_ALIAS("wmi:" MSIWMI_WIND_EVENT_GUID);
34
35enum msi_scancodes {
36 /* Generic MSI keys (not present on MSI Wind) */
37 MSI_KEY_BRIGHTNESSUP = 0xD0,
38 MSI_KEY_BRIGHTNESSDOWN,
39 MSI_KEY_VOLUMEUP,
40 MSI_KEY_VOLUMEDOWN,
41 MSI_KEY_MUTE,
42 /* MSI Wind keys */
43 WIND_KEY_TOUCHPAD = 0x08, /* Fn+F3 touchpad toggle */
44 WIND_KEY_BLUETOOTH = 0x56, /* Fn+F11 Bluetooth toggle */
45 WIND_KEY_CAMERA, /* Fn+F6 webcam toggle */
46 WIND_KEY_WLAN = 0x5f, /* Fn+F11 Wi-Fi toggle */
47 WIND_KEY_TURBO, /* Fn+F10 turbo mode toggle */
48 WIND_KEY_ECO = 0x69, /* Fn+F10 ECO mode toggle */
49};
50static struct key_entry msi_wmi_keymap[] = {
51 { KE_KEY, MSI_KEY_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
52 { KE_KEY, MSI_KEY_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
53 { KE_KEY, MSI_KEY_VOLUMEUP, {KEY_VOLUMEUP} },
54 { KE_KEY, MSI_KEY_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
55 { KE_KEY, MSI_KEY_MUTE, {KEY_MUTE} },
56
57 /* These keys work without WMI. Ignore them to avoid double keycodes */
58 { KE_IGNORE, WIND_KEY_TOUCHPAD, {KEY_TOUCHPAD_TOGGLE} },
59 { KE_IGNORE, WIND_KEY_BLUETOOTH, {KEY_BLUETOOTH} },
60 { KE_IGNORE, WIND_KEY_CAMERA, {KEY_CAMERA} },
61 { KE_IGNORE, WIND_KEY_WLAN, {KEY_WLAN} },
62
63 /* These are unknown WMI events found on MSI Wind */
64 { KE_IGNORE, 0x00 },
65 { KE_IGNORE, 0x62 },
66 { KE_IGNORE, 0x63 },
67
68 /* These are MSI Wind keys that should be handled via WMI */
69 { KE_KEY, WIND_KEY_TURBO, {KEY_PROG1} },
70 { KE_KEY, WIND_KEY_ECO, {KEY_PROG2} },
71
72 { KE_END, 0 }
73};
74
75static ktime_t last_pressed;
76
77static const struct {
78 const char *guid;
79 bool quirk_last_pressed;
80} *event_wmi, event_wmis[] = {
81 { MSIWMI_MSI_EVENT_GUID, true },
82 { MSIWMI_WIND_EVENT_GUID, false },
83};
84
85static struct backlight_device *backlight;
86
87static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
88
89static struct input_dev *msi_wmi_input_dev;
90
91static int msi_wmi_query_block(int instance, int *ret)
92{
93 acpi_status status;
94 union acpi_object *obj;
95
96 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
97
98 status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
99 if (ACPI_FAILURE(status))
100 return -EIO;
101
102 obj = output.pointer;
103
104 if (!obj || obj->type != ACPI_TYPE_INTEGER) {
105 if (obj) {
106 pr_err("query block returned object "
107 "type: %d - buffer length:%d\n", obj->type,
108 obj->type == ACPI_TYPE_BUFFER ?
109 obj->buffer.length : 0);
110 }
111 kfree(obj);
112 return -EINVAL;
113 }
114 *ret = obj->integer.value;
115 kfree(obj);
116 return 0;
117}
118
119static int msi_wmi_set_block(int instance, int value)
120{
121 acpi_status status;
122
123 struct acpi_buffer input = { sizeof(int), &value };
124
125 pr_debug("Going to set block of instance: %d - value: %d\n",
126 instance, value);
127
128 status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
129
130 return ACPI_SUCCESS(status) ? 0 : 1;
131}
132
133static int bl_get(struct backlight_device *bd)
134{
135 int level, err, ret;
136
137 /* Instance 1 is "get backlight", cmp with DSDT */
138 err = msi_wmi_query_block(1, &ret);
139 if (err) {
140 pr_err("Could not query backlight: %d\n", err);
141 return -EINVAL;
142 }
143 pr_debug("Get: Query block returned: %d\n", ret);
144 for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
145 if (backlight_map[level] == ret) {
146 pr_debug("Current backlight level: 0x%X - index: %d\n",
147 backlight_map[level], level);
148 break;
149 }
150 }
151 if (level == ARRAY_SIZE(backlight_map)) {
152 pr_err("get: Invalid brightness value: 0x%X\n", ret);
153 return -EINVAL;
154 }
155 return level;
156}
157
158static int bl_set_status(struct backlight_device *bd)
159{
160 int bright = bd->props.brightness;
161 if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
162 return -EINVAL;
163
164 /* Instance 0 is "set backlight" */
165 return msi_wmi_set_block(0, backlight_map[bright]);
166}
167
168static const struct backlight_ops msi_backlight_ops = {
169 .get_brightness = bl_get,
170 .update_status = bl_set_status,
171};
172
173static void msi_wmi_notify(u32 value, void *context)
174{
175 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
176 struct key_entry *key;
177 union acpi_object *obj;
178 acpi_status status;
179
180 status = wmi_get_event_data(value, &response);
181 if (status != AE_OK) {
182 pr_info("bad event status 0x%x\n", status);
183 return;
184 }
185
186 obj = (union acpi_object *)response.pointer;
187
188 if (obj && obj->type == ACPI_TYPE_INTEGER) {
189 int eventcode = obj->integer.value;
190 pr_debug("Eventcode: 0x%x\n", eventcode);
191 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
192 eventcode);
193 if (!key) {
194 pr_info("Unknown key pressed - %x\n", eventcode);
195 goto msi_wmi_notify_exit;
196 }
197
198 if (event_wmi->quirk_last_pressed) {
199 ktime_t cur = ktime_get_real();
200 ktime_t diff = ktime_sub(cur, last_pressed);
201 /* Ignore event if any event happened in a 50 ms
202 timeframe -> Key press may result in 10-20 GPEs */
203 if (ktime_to_us(diff) < 1000 * 50) {
204 pr_debug("Suppressed key event 0x%X - "
205 "Last press was %lld us ago\n",
206 key->code, ktime_to_us(diff));
207 goto msi_wmi_notify_exit;
208 }
209 last_pressed = cur;
210 }
211
212 if (key->type == KE_KEY &&
213 /* Brightness is served via acpi video driver */
214 (backlight ||
215 (key->code != MSI_KEY_BRIGHTNESSUP &&
216 key->code != MSI_KEY_BRIGHTNESSDOWN))) {
217 pr_debug("Send key: 0x%X - Input layer keycode: %d\n",
218 key->code, key->keycode);
219 sparse_keymap_report_entry(msi_wmi_input_dev, key, 1,
220 true);
221 }
222 } else
223 pr_info("Unknown event received\n");
224
225msi_wmi_notify_exit:
226 kfree(response.pointer);
227}
228
229static int __init msi_wmi_backlight_setup(void)
230{
231 int err;
232 struct backlight_properties props;
233
234 memset(&props, 0, sizeof(struct backlight_properties));
235 props.type = BACKLIGHT_PLATFORM;
236 props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
237 backlight = backlight_device_register(DRV_NAME, NULL, NULL,
238 &msi_backlight_ops,
239 &props);
240 if (IS_ERR(backlight))
241 return PTR_ERR(backlight);
242
243 err = bl_get(NULL);
244 if (err < 0) {
245 backlight_device_unregister(backlight);
246 return err;
247 }
248
249 backlight->props.brightness = err;
250
251 return 0;
252}
253
254static int __init msi_wmi_input_setup(void)
255{
256 int err;
257
258 msi_wmi_input_dev = input_allocate_device();
259 if (!msi_wmi_input_dev)
260 return -ENOMEM;
261
262 msi_wmi_input_dev->name = "MSI WMI hotkeys";
263 msi_wmi_input_dev->phys = "wmi/input0";
264 msi_wmi_input_dev->id.bustype = BUS_HOST;
265
266 err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
267 if (err)
268 goto err_free_dev;
269
270 err = input_register_device(msi_wmi_input_dev);
271
272 if (err)
273 goto err_free_dev;
274
275 last_pressed = 0;
276
277 return 0;
278
279err_free_dev:
280 input_free_device(msi_wmi_input_dev);
281 return err;
282}
283
284static int __init msi_wmi_init(void)
285{
286 int err;
287 int i;
288
289 for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
290 if (!wmi_has_guid(event_wmis[i].guid))
291 continue;
292
293 err = msi_wmi_input_setup();
294 if (err) {
295 pr_err("Unable to setup input device\n");
296 return err;
297 }
298
299 err = wmi_install_notify_handler(event_wmis[i].guid,
300 msi_wmi_notify, NULL);
301 if (ACPI_FAILURE(err)) {
302 pr_err("Unable to setup WMI notify handler\n");
303 goto err_free_input;
304 }
305
306 pr_debug("Event handler installed\n");
307 event_wmi = &event_wmis[i];
308 break;
309 }
310
311 if (wmi_has_guid(MSIWMI_BIOS_GUID) &&
312 acpi_video_get_backlight_type() == acpi_backlight_vendor) {
313 err = msi_wmi_backlight_setup();
314 if (err) {
315 pr_err("Unable to setup backlight device\n");
316 goto err_uninstall_handler;
317 }
318 pr_debug("Backlight device created\n");
319 }
320
321 if (!event_wmi && !backlight) {
322 pr_err("This machine doesn't have neither MSI-hotkeys nor backlight through WMI\n");
323 return -ENODEV;
324 }
325
326 return 0;
327
328err_uninstall_handler:
329 if (event_wmi)
330 wmi_remove_notify_handler(event_wmi->guid);
331err_free_input:
332 if (event_wmi)
333 input_unregister_device(msi_wmi_input_dev);
334 return err;
335}
336
337static void __exit msi_wmi_exit(void)
338{
339 if (event_wmi) {
340 wmi_remove_notify_handler(event_wmi->guid);
341 input_unregister_device(msi_wmi_input_dev);
342 }
343 backlight_device_unregister(backlight);
344}
345
346module_init(msi_wmi_init);
347module_exit(msi_wmi_exit);