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