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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/acpi.h>
11#include <linux/input.h>
12#include <linux/input/sparse-keymap.h>
13#include <linux/kernel.h>
14#include <linux/leds.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/types.h>
18
19#define LED_DEVICE(_name, max) struct led_classdev _name = { \
20 .name = __stringify(_name), \
21 .max_brightness = max, \
22 .brightness_set = _name##_set, \
23 .brightness_get = _name##_get, \
24}
25
26MODULE_AUTHOR("Matan Ziv-Av");
27MODULE_DESCRIPTION("LG WMI Hotkey Driver");
28MODULE_LICENSE("GPL");
29
30#define WMI_EVENT_GUID0 "E4FB94F9-7F2B-4173-AD1A-CD1D95086248"
31#define WMI_EVENT_GUID1 "023B133E-49D1-4E10-B313-698220140DC2"
32#define WMI_EVENT_GUID2 "37BE1AC0-C3F2-4B1F-BFBE-8FDEAF2814D6"
33#define WMI_EVENT_GUID3 "911BAD44-7DF8-4FBB-9319-BABA1C4B293B"
34#define WMI_METHOD_WMAB "C3A72B38-D3EF-42D3-8CBB-D5A57049F66D"
35#define WMI_METHOD_WMBB "2B4F501A-BD3C-4394-8DCF-00A7D2BC8210"
36#define WMI_EVENT_GUID WMI_EVENT_GUID0
37
38#define WMAB_METHOD "\\XINI.WMAB"
39#define WMBB_METHOD "\\XINI.WMBB"
40#define SB_GGOV_METHOD "\\_SB.GGOV"
41#define GOV_TLED 0x2020008
42#define WM_GET 1
43#define WM_SET 2
44#define WM_KEY_LIGHT 0x400
45#define WM_TLED 0x404
46#define WM_FN_LOCK 0x407
47#define WM_BATT_LIMIT 0x61
48#define WM_READER_MODE 0xBF
49#define WM_FAN_MODE 0x33
50#define WMBB_USB_CHARGE 0x10B
51#define WMBB_BATT_LIMIT 0x10C
52
53#define PLATFORM_NAME "lg-laptop"
54
55MODULE_ALIAS("wmi:" WMI_EVENT_GUID0);
56MODULE_ALIAS("wmi:" WMI_EVENT_GUID1);
57MODULE_ALIAS("wmi:" WMI_EVENT_GUID2);
58MODULE_ALIAS("wmi:" WMI_EVENT_GUID3);
59MODULE_ALIAS("wmi:" WMI_METHOD_WMAB);
60MODULE_ALIAS("wmi:" WMI_METHOD_WMBB);
61MODULE_ALIAS("acpi*:LGEX0815:*");
62
63static struct platform_device *pf_device;
64static struct input_dev *wmi_input_dev;
65
66static u32 inited;
67#define INIT_INPUT_WMI_0 0x01
68#define INIT_INPUT_WMI_2 0x02
69#define INIT_INPUT_ACPI 0x04
70#define INIT_SPARSE_KEYMAP 0x80
71
72static const struct key_entry wmi_keymap[] = {
73 {KE_KEY, 0x70, {KEY_F15} },
74 {KE_KEY, 0x74, {KEY_F13} },
75 {KE_KEY, 0xf020000, {KEY_F14} },
76 {KE_KEY, 0x10000000, {KEY_F16} },
77
78
79
80 {KE_KEY, 0x80, {KEY_RFKILL} },
81 {KE_END, 0}
82};
83
84static int ggov(u32 arg0)
85{
86 union acpi_object args[1];
87 union acpi_object *r;
88 acpi_status status;
89 acpi_handle handle;
90 struct acpi_object_list arg;
91 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
92 int res;
93
94 args[0].type = ACPI_TYPE_INTEGER;
95 args[0].integer.value = arg0;
96
97 status = acpi_get_handle(NULL, (acpi_string) SB_GGOV_METHOD, &handle);
98 if (ACPI_FAILURE(status)) {
99 pr_err("Cannot get handle");
100 return -ENODEV;
101 }
102
103 arg.count = 1;
104 arg.pointer = args;
105
106 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
107 if (ACPI_FAILURE(status)) {
108 acpi_handle_err(handle, "GGOV: call failed.\n");
109 return -EINVAL;
110 }
111
112 r = buffer.pointer;
113 if (r->type != ACPI_TYPE_INTEGER) {
114 kfree(r);
115 return -EINVAL;
116 }
117
118 res = r->integer.value;
119 kfree(r);
120
121 return res;
122}
123
124static union acpi_object *lg_wmab(u32 method, u32 arg1, u32 arg2)
125{
126 union acpi_object args[3];
127 acpi_status status;
128 acpi_handle handle;
129 struct acpi_object_list arg;
130 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
131
132 args[0].type = ACPI_TYPE_INTEGER;
133 args[0].integer.value = method;
134 args[1].type = ACPI_TYPE_INTEGER;
135 args[1].integer.value = arg1;
136 args[2].type = ACPI_TYPE_INTEGER;
137 args[2].integer.value = arg2;
138
139 status = acpi_get_handle(NULL, (acpi_string) WMAB_METHOD, &handle);
140 if (ACPI_FAILURE(status)) {
141 pr_err("Cannot get handle");
142 return NULL;
143 }
144
145 arg.count = 3;
146 arg.pointer = args;
147
148 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
149 if (ACPI_FAILURE(status)) {
150 acpi_handle_err(handle, "WMAB: call failed.\n");
151 return NULL;
152 }
153
154 return buffer.pointer;
155}
156
157static union acpi_object *lg_wmbb(u32 method_id, u32 arg1, u32 arg2)
158{
159 union acpi_object args[3];
160 acpi_status status;
161 acpi_handle handle;
162 struct acpi_object_list arg;
163 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
164 u8 buf[32];
165
166 *(u32 *)buf = method_id;
167 *(u32 *)(buf + 4) = arg1;
168 *(u32 *)(buf + 16) = arg2;
169 args[0].type = ACPI_TYPE_INTEGER;
170 args[0].integer.value = 0;
171 args[1].type = ACPI_TYPE_INTEGER;
172 args[1].integer.value = 1;
173 args[2].type = ACPI_TYPE_BUFFER;
174 args[2].buffer.length = 32;
175 args[2].buffer.pointer = buf;
176
177 status = acpi_get_handle(NULL, (acpi_string)WMBB_METHOD, &handle);
178 if (ACPI_FAILURE(status)) {
179 pr_err("Cannot get handle");
180 return NULL;
181 }
182
183 arg.count = 3;
184 arg.pointer = args;
185
186 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
187 if (ACPI_FAILURE(status)) {
188 acpi_handle_err(handle, "WMAB: call failed.\n");
189 return NULL;
190 }
191
192 return (union acpi_object *)buffer.pointer;
193}
194
195static void wmi_notify(u32 value, void *context)
196{
197 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
198 union acpi_object *obj;
199 acpi_status status;
200 long data = (long)context;
201
202 pr_debug("event guid %li\n", data);
203 status = wmi_get_event_data(value, &response);
204 if (ACPI_FAILURE(status)) {
205 pr_err("Bad event status 0x%x\n", status);
206 return;
207 }
208
209 obj = (union acpi_object *)response.pointer;
210 if (!obj)
211 return;
212
213 if (obj->type == ACPI_TYPE_INTEGER) {
214 int eventcode = obj->integer.value;
215 struct key_entry *key;
216
217 key =
218 sparse_keymap_entry_from_scancode(wmi_input_dev, eventcode);
219 if (key && key->type == KE_KEY)
220 sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
221 }
222
223 pr_debug("Type: %i Eventcode: 0x%llx\n", obj->type,
224 obj->integer.value);
225 kfree(response.pointer);
226}
227
228static void wmi_input_setup(void)
229{
230 acpi_status status;
231
232 wmi_input_dev = input_allocate_device();
233 if (wmi_input_dev) {
234 wmi_input_dev->name = "LG WMI hotkeys";
235 wmi_input_dev->phys = "wmi/input0";
236 wmi_input_dev->id.bustype = BUS_HOST;
237
238 if (sparse_keymap_setup(wmi_input_dev, wmi_keymap, NULL) ||
239 input_register_device(wmi_input_dev)) {
240 pr_info("Cannot initialize input device");
241 input_free_device(wmi_input_dev);
242 return;
243 }
244
245 inited |= INIT_SPARSE_KEYMAP;
246 status = wmi_install_notify_handler(WMI_EVENT_GUID0, wmi_notify,
247 (void *)0);
248 if (ACPI_SUCCESS(status))
249 inited |= INIT_INPUT_WMI_0;
250
251 status = wmi_install_notify_handler(WMI_EVENT_GUID2, wmi_notify,
252 (void *)2);
253 if (ACPI_SUCCESS(status))
254 inited |= INIT_INPUT_WMI_2;
255 } else {
256 pr_info("Cannot allocate input device");
257 }
258}
259
260static void acpi_notify(struct acpi_device *device, u32 event)
261{
262 struct key_entry *key;
263
264 acpi_handle_debug(device->handle, "notify: %d\n", event);
265 if (inited & INIT_SPARSE_KEYMAP) {
266 key = sparse_keymap_entry_from_scancode(wmi_input_dev, 0x80);
267 if (key && key->type == KE_KEY)
268 sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
269 }
270}
271
272static ssize_t fan_mode_store(struct device *dev,
273 struct device_attribute *attr,
274 const char *buffer, size_t count)
275{
276 bool value;
277 union acpi_object *r;
278 u32 m;
279 int ret;
280
281 ret = kstrtobool(buffer, &value);
282 if (ret)
283 return ret;
284
285 r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
286 if (!r)
287 return -EIO;
288
289 if (r->type != ACPI_TYPE_INTEGER) {
290 kfree(r);
291 return -EIO;
292 }
293
294 m = r->integer.value;
295 kfree(r);
296 r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xffffff0f) | (value << 4));
297 kfree(r);
298 r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xfffffff0) | value);
299 kfree(r);
300
301 return count;
302}
303
304static ssize_t fan_mode_show(struct device *dev,
305 struct device_attribute *attr, char *buffer)
306{
307 unsigned int status;
308 union acpi_object *r;
309
310 r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
311 if (!r)
312 return -EIO;
313
314 if (r->type != ACPI_TYPE_INTEGER) {
315 kfree(r);
316 return -EIO;
317 }
318
319 status = r->integer.value & 0x01;
320 kfree(r);
321
322 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
323}
324
325static ssize_t usb_charge_store(struct device *dev,
326 struct device_attribute *attr,
327 const char *buffer, size_t count)
328{
329 bool value;
330 union acpi_object *r;
331 int ret;
332
333 ret = kstrtobool(buffer, &value);
334 if (ret)
335 return ret;
336
337 r = lg_wmbb(WMBB_USB_CHARGE, WM_SET, value);
338 if (!r)
339 return -EIO;
340
341 kfree(r);
342 return count;
343}
344
345static ssize_t usb_charge_show(struct device *dev,
346 struct device_attribute *attr, char *buffer)
347{
348 unsigned int status;
349 union acpi_object *r;
350
351 r = lg_wmbb(WMBB_USB_CHARGE, WM_GET, 0);
352 if (!r)
353 return -EIO;
354
355 if (r->type != ACPI_TYPE_BUFFER) {
356 kfree(r);
357 return -EIO;
358 }
359
360 status = !!r->buffer.pointer[0x10];
361
362 kfree(r);
363
364 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
365}
366
367static ssize_t reader_mode_store(struct device *dev,
368 struct device_attribute *attr,
369 const char *buffer, size_t count)
370{
371 bool value;
372 union acpi_object *r;
373 int ret;
374
375 ret = kstrtobool(buffer, &value);
376 if (ret)
377 return ret;
378
379 r = lg_wmab(WM_READER_MODE, WM_SET, value);
380 if (!r)
381 return -EIO;
382
383 kfree(r);
384 return count;
385}
386
387static ssize_t reader_mode_show(struct device *dev,
388 struct device_attribute *attr, char *buffer)
389{
390 unsigned int status;
391 union acpi_object *r;
392
393 r = lg_wmab(WM_READER_MODE, WM_GET, 0);
394 if (!r)
395 return -EIO;
396
397 if (r->type != ACPI_TYPE_INTEGER) {
398 kfree(r);
399 return -EIO;
400 }
401
402 status = !!r->integer.value;
403
404 kfree(r);
405
406 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
407}
408
409static ssize_t fn_lock_store(struct device *dev,
410 struct device_attribute *attr,
411 const char *buffer, size_t count)
412{
413 bool value;
414 union acpi_object *r;
415 int ret;
416
417 ret = kstrtobool(buffer, &value);
418 if (ret)
419 return ret;
420
421 r = lg_wmab(WM_FN_LOCK, WM_SET, value);
422 if (!r)
423 return -EIO;
424
425 kfree(r);
426 return count;
427}
428
429static ssize_t fn_lock_show(struct device *dev,
430 struct device_attribute *attr, char *buffer)
431{
432 unsigned int status;
433 union acpi_object *r;
434
435 r = lg_wmab(WM_FN_LOCK, WM_GET, 0);
436 if (!r)
437 return -EIO;
438
439 if (r->type != ACPI_TYPE_BUFFER) {
440 kfree(r);
441 return -EIO;
442 }
443
444 status = !!r->buffer.pointer[0];
445 kfree(r);
446
447 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
448}
449
450static ssize_t battery_care_limit_store(struct device *dev,
451 struct device_attribute *attr,
452 const char *buffer, size_t count)
453{
454 unsigned long value;
455 int ret;
456
457 ret = kstrtoul(buffer, 10, &value);
458 if (ret)
459 return ret;
460
461 if (value == 100 || value == 80) {
462 union acpi_object *r;
463
464 r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
465 if (!r)
466 return -EIO;
467
468 kfree(r);
469 return count;
470 }
471
472 return -EINVAL;
473}
474
475static ssize_t battery_care_limit_show(struct device *dev,
476 struct device_attribute *attr,
477 char *buffer)
478{
479 unsigned int status;
480 union acpi_object *r;
481
482 r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
483 if (!r)
484 return -EIO;
485
486 if (r->type != ACPI_TYPE_INTEGER) {
487 kfree(r);
488 return -EIO;
489 }
490
491 status = r->integer.value;
492 kfree(r);
493 if (status != 80 && status != 100)
494 status = 0;
495
496 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
497}
498
499static DEVICE_ATTR_RW(fan_mode);
500static DEVICE_ATTR_RW(usb_charge);
501static DEVICE_ATTR_RW(reader_mode);
502static DEVICE_ATTR_RW(fn_lock);
503static DEVICE_ATTR_RW(battery_care_limit);
504
505static struct attribute *dev_attributes[] = {
506 &dev_attr_fan_mode.attr,
507 &dev_attr_usb_charge.attr,
508 &dev_attr_reader_mode.attr,
509 &dev_attr_fn_lock.attr,
510 &dev_attr_battery_care_limit.attr,
511 NULL
512};
513
514static const struct attribute_group dev_attribute_group = {
515 .attrs = dev_attributes,
516};
517
518static void tpad_led_set(struct led_classdev *cdev,
519 enum led_brightness brightness)
520{
521 union acpi_object *r;
522
523 r = lg_wmab(WM_TLED, WM_SET, brightness > LED_OFF);
524 kfree(r);
525}
526
527static enum led_brightness tpad_led_get(struct led_classdev *cdev)
528{
529 return ggov(GOV_TLED) > 0 ? LED_ON : LED_OFF;
530}
531
532static LED_DEVICE(tpad_led, 1);
533
534static void kbd_backlight_set(struct led_classdev *cdev,
535 enum led_brightness brightness)
536{
537 u32 val;
538 union acpi_object *r;
539
540 val = 0x22;
541 if (brightness <= LED_OFF)
542 val = 0;
543 if (brightness >= LED_FULL)
544 val = 0x24;
545 r = lg_wmab(WM_KEY_LIGHT, WM_SET, val);
546 kfree(r);
547}
548
549static enum led_brightness kbd_backlight_get(struct led_classdev *cdev)
550{
551 union acpi_object *r;
552 int val;
553
554 r = lg_wmab(WM_KEY_LIGHT, WM_GET, 0);
555
556 if (!r)
557 return LED_OFF;
558
559 if (r->type != ACPI_TYPE_BUFFER || r->buffer.pointer[1] != 0x05) {
560 kfree(r);
561 return LED_OFF;
562 }
563
564 switch (r->buffer.pointer[0] & 0x27) {
565 case 0x24:
566 val = LED_FULL;
567 break;
568 case 0x22:
569 val = LED_HALF;
570 break;
571 default:
572 val = LED_OFF;
573 }
574
575 kfree(r);
576
577 return val;
578}
579
580static LED_DEVICE(kbd_backlight, 255);
581
582static void wmi_input_destroy(void)
583{
584 if (inited & INIT_INPUT_WMI_2)
585 wmi_remove_notify_handler(WMI_EVENT_GUID2);
586
587 if (inited & INIT_INPUT_WMI_0)
588 wmi_remove_notify_handler(WMI_EVENT_GUID0);
589
590 if (inited & INIT_SPARSE_KEYMAP)
591 input_unregister_device(wmi_input_dev);
592
593 inited &= ~(INIT_INPUT_WMI_0 | INIT_INPUT_WMI_2 | INIT_SPARSE_KEYMAP);
594}
595
596static struct platform_driver pf_driver = {
597 .driver = {
598 .name = PLATFORM_NAME,
599 }
600};
601
602static int acpi_add(struct acpi_device *device)
603{
604 int ret;
605
606 if (pf_device)
607 return 0;
608
609 ret = platform_driver_register(&pf_driver);
610 if (ret)
611 return ret;
612
613 pf_device = platform_device_register_simple(PLATFORM_NAME,
614 PLATFORM_DEVID_NONE,
615 NULL, 0);
616 if (IS_ERR(pf_device)) {
617 ret = PTR_ERR(pf_device);
618 pf_device = NULL;
619 pr_err("unable to register platform device\n");
620 goto out_platform_registered;
621 }
622
623 ret = sysfs_create_group(&pf_device->dev.kobj, &dev_attribute_group);
624 if (ret)
625 goto out_platform_device;
626
627
628 led_classdev_register(&pf_device->dev, &kbd_backlight);
629 led_classdev_register(&pf_device->dev, &tpad_led);
630
631 wmi_input_setup();
632
633 return 0;
634
635out_platform_device:
636 platform_device_unregister(pf_device);
637out_platform_registered:
638 platform_driver_unregister(&pf_driver);
639 return ret;
640}
641
642static int acpi_remove(struct acpi_device *device)
643{
644 sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
645
646 led_classdev_unregister(&tpad_led);
647 led_classdev_unregister(&kbd_backlight);
648
649 wmi_input_destroy();
650 platform_device_unregister(pf_device);
651 pf_device = NULL;
652 platform_driver_unregister(&pf_driver);
653
654 return 0;
655}
656
657static const struct acpi_device_id device_ids[] = {
658 {"LGEX0815", 0},
659 {"", 0}
660};
661MODULE_DEVICE_TABLE(acpi, device_ids);
662
663static struct acpi_driver acpi_driver = {
664 .name = "LG Gram Laptop Support",
665 .class = "lg-laptop",
666 .ids = device_ids,
667 .ops = {
668 .add = acpi_add,
669 .remove = acpi_remove,
670 .notify = acpi_notify,
671 },
672 .owner = THIS_MODULE,
673};
674
675static int __init acpi_init(void)
676{
677 int result;
678
679 result = acpi_bus_register_driver(&acpi_driver);
680 if (result < 0) {
681 pr_debug("Error registering driver\n");
682 return -ENODEV;
683 }
684
685 return 0;
686}
687
688static void __exit acpi_exit(void)
689{
690 acpi_bus_unregister_driver(&acpi_driver);
691}
692
693module_init(acpi_init);
694module_exit(acpi_exit);
695
