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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
50 MSI_KEY_BRIGHTNESSUP = 0xD0,
51 MSI_KEY_BRIGHTNESSDOWN,
52 MSI_KEY_VOLUMEUP,
53 MSI_KEY_VOLUMEDOWN,
54 MSI_KEY_MUTE,
55
56 WIND_KEY_TOUCHPAD = 0x08,
57 WIND_KEY_BLUETOOTH = 0x56,
58 WIND_KEY_CAMERA,
59 WIND_KEY_WLAN = 0x5f,
60 WIND_KEY_TURBO,
61 WIND_KEY_ECO = 0x69,
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
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
77 { KE_IGNORE, 0x00 },
78 { KE_IGNORE, 0x62 },
79 { KE_IGNORE, 0x63 },
80
81
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
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
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 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
213
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
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_dev;
285
286 last_pressed = 0;
287
288 return 0;
289
290err_free_dev:
291 input_free_device(msi_wmi_input_dev);
292 return err;
293}
294
295static int __init msi_wmi_init(void)
296{
297 int err;
298 int i;
299
300 for (i = 0; i < ARRAY_SIZE(event_wmis); i++) {
301 if (!wmi_has_guid(event_wmis[i].guid))
302 continue;
303
304 err = msi_wmi_input_setup();
305 if (err) {
306 pr_err("Unable to setup input device\n");
307 return err;
308 }
309
310 err = wmi_install_notify_handler(event_wmis[i].guid,
311 msi_wmi_notify, NULL);
312 if (ACPI_FAILURE(err)) {
313 pr_err("Unable to setup WMI notify handler\n");
314 goto err_free_input;
315 }
316
317 pr_debug("Event handler installed\n");
318 event_wmi = &event_wmis[i];
319 break;
320 }
321
322 if (wmi_has_guid(MSIWMI_BIOS_GUID) &&
323 acpi_video_get_backlight_type() == acpi_backlight_vendor) {
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 input_unregister_device(msi_wmi_input_dev);
345 return err;
346}
347
348static void __exit msi_wmi_exit(void)
349{
350 if (event_wmi) {
351 wmi_remove_notify_handler(event_wmi->guid);
352 input_unregister_device(msi_wmi_input_dev);
353 }
354 backlight_device_unregister(backlight);
355}
356
357module_init(msi_wmi_init);
358module_exit(msi_wmi_exit);
359
