Loading...
Note: File does not exist in v4.6.
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * lg-laptop.c - LG Gram ACPI features and hotkeys Driver
4 *
5 * Copyright (C) 2018 Matan Ziv-Av <matan@svgalib.org>
6 */
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_TPAD_LED 0x08
71#define INIT_KBD_LED 0x10
72#define INIT_SPARSE_KEYMAP 0x80
73
74static const struct key_entry wmi_keymap[] = {
75 {KE_KEY, 0x70, {KEY_F15} }, /* LG control panel (F1) */
76 {KE_KEY, 0x74, {KEY_F13} }, /* Touchpad toggle (F5) */
77 {KE_KEY, 0xf020000, {KEY_F14} }, /* Read mode (F9) */
78 {KE_KEY, 0x10000000, {KEY_F16} },/* Keyboard backlight (F8) - pressing
79 * this key both sends an event and
80 * changes backlight level.
81 */
82 {KE_KEY, 0x80, {KEY_RFKILL} },
83 {KE_END, 0}
84};
85
86static int ggov(u32 arg0)
87{
88 union acpi_object args[1];
89 union acpi_object *r;
90 acpi_status status;
91 acpi_handle handle;
92 struct acpi_object_list arg;
93 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
94 int res;
95
96 args[0].type = ACPI_TYPE_INTEGER;
97 args[0].integer.value = arg0;
98
99 status = acpi_get_handle(NULL, (acpi_string) SB_GGOV_METHOD, &handle);
100 if (ACPI_FAILURE(status)) {
101 pr_err("Cannot get handle");
102 return -ENODEV;
103 }
104
105 arg.count = 1;
106 arg.pointer = args;
107
108 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
109 if (ACPI_FAILURE(status)) {
110 acpi_handle_err(handle, "GGOV: call failed.\n");
111 return -EINVAL;
112 }
113
114 r = buffer.pointer;
115 if (r->type != ACPI_TYPE_INTEGER) {
116 kfree(r);
117 return -EINVAL;
118 }
119
120 res = r->integer.value;
121 kfree(r);
122
123 return res;
124}
125
126static union acpi_object *lg_wmab(u32 method, u32 arg1, u32 arg2)
127{
128 union acpi_object args[3];
129 acpi_status status;
130 acpi_handle handle;
131 struct acpi_object_list arg;
132 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
133
134 args[0].type = ACPI_TYPE_INTEGER;
135 args[0].integer.value = method;
136 args[1].type = ACPI_TYPE_INTEGER;
137 args[1].integer.value = arg1;
138 args[2].type = ACPI_TYPE_INTEGER;
139 args[2].integer.value = arg2;
140
141 status = acpi_get_handle(NULL, (acpi_string) WMAB_METHOD, &handle);
142 if (ACPI_FAILURE(status)) {
143 pr_err("Cannot get handle");
144 return NULL;
145 }
146
147 arg.count = 3;
148 arg.pointer = args;
149
150 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
151 if (ACPI_FAILURE(status)) {
152 acpi_handle_err(handle, "WMAB: call failed.\n");
153 return NULL;
154 }
155
156 return buffer.pointer;
157}
158
159static union acpi_object *lg_wmbb(u32 method_id, u32 arg1, u32 arg2)
160{
161 union acpi_object args[3];
162 acpi_status status;
163 acpi_handle handle;
164 struct acpi_object_list arg;
165 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
166 u8 buf[32];
167
168 *(u32 *)buf = method_id;
169 *(u32 *)(buf + 4) = arg1;
170 *(u32 *)(buf + 16) = arg2;
171 args[0].type = ACPI_TYPE_INTEGER;
172 args[0].integer.value = 0; /* ignored */
173 args[1].type = ACPI_TYPE_INTEGER;
174 args[1].integer.value = 1; /* Must be 1 or 2. Does not matter which */
175 args[2].type = ACPI_TYPE_BUFFER;
176 args[2].buffer.length = 32;
177 args[2].buffer.pointer = buf;
178
179 status = acpi_get_handle(NULL, (acpi_string)WMBB_METHOD, &handle);
180 if (ACPI_FAILURE(status)) {
181 pr_err("Cannot get handle");
182 return NULL;
183 }
184
185 arg.count = 3;
186 arg.pointer = args;
187
188 status = acpi_evaluate_object(handle, NULL, &arg, &buffer);
189 if (ACPI_FAILURE(status)) {
190 acpi_handle_err(handle, "WMAB: call failed.\n");
191 return NULL;
192 }
193
194 return (union acpi_object *)buffer.pointer;
195}
196
197static void wmi_notify(u32 value, void *context)
198{
199 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
200 union acpi_object *obj;
201 acpi_status status;
202 long data = (long)context;
203
204 pr_debug("event guid %li\n", data);
205 status = wmi_get_event_data(value, &response);
206 if (ACPI_FAILURE(status)) {
207 pr_err("Bad event status 0x%x\n", status);
208 return;
209 }
210
211 obj = (union acpi_object *)response.pointer;
212 if (!obj)
213 return;
214
215 if (obj->type == ACPI_TYPE_INTEGER) {
216 int eventcode = obj->integer.value;
217 struct key_entry *key;
218
219 key =
220 sparse_keymap_entry_from_scancode(wmi_input_dev, eventcode);
221 if (key && key->type == KE_KEY)
222 sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
223 }
224
225 pr_debug("Type: %i Eventcode: 0x%llx\n", obj->type,
226 obj->integer.value);
227 kfree(response.pointer);
228}
229
230static void wmi_input_setup(void)
231{
232 acpi_status status;
233
234 wmi_input_dev = input_allocate_device();
235 if (wmi_input_dev) {
236 wmi_input_dev->name = "LG WMI hotkeys";
237 wmi_input_dev->phys = "wmi/input0";
238 wmi_input_dev->id.bustype = BUS_HOST;
239
240 if (sparse_keymap_setup(wmi_input_dev, wmi_keymap, NULL) ||
241 input_register_device(wmi_input_dev)) {
242 pr_info("Cannot initialize input device");
243 input_free_device(wmi_input_dev);
244 return;
245 }
246
247 inited |= INIT_SPARSE_KEYMAP;
248 status = wmi_install_notify_handler(WMI_EVENT_GUID0, wmi_notify,
249 (void *)0);
250 if (ACPI_SUCCESS(status))
251 inited |= INIT_INPUT_WMI_0;
252
253 status = wmi_install_notify_handler(WMI_EVENT_GUID2, wmi_notify,
254 (void *)2);
255 if (ACPI_SUCCESS(status))
256 inited |= INIT_INPUT_WMI_2;
257 } else {
258 pr_info("Cannot allocate input device");
259 }
260}
261
262static void acpi_notify(struct acpi_device *device, u32 event)
263{
264 struct key_entry *key;
265
266 acpi_handle_debug(device->handle, "notify: %d\n", event);
267 if (inited & INIT_SPARSE_KEYMAP) {
268 key = sparse_keymap_entry_from_scancode(wmi_input_dev, 0x80);
269 if (key && key->type == KE_KEY)
270 sparse_keymap_report_entry(wmi_input_dev, key, 1, true);
271 }
272}
273
274static ssize_t fan_mode_store(struct device *dev,
275 struct device_attribute *attr,
276 const char *buffer, size_t count)
277{
278 bool value;
279 union acpi_object *r;
280 u32 m;
281 int ret;
282
283 ret = kstrtobool(buffer, &value);
284 if (ret)
285 return ret;
286
287 r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
288 if (!r)
289 return -EIO;
290
291 if (r->type != ACPI_TYPE_INTEGER) {
292 kfree(r);
293 return -EIO;
294 }
295
296 m = r->integer.value;
297 kfree(r);
298 r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xffffff0f) | (value << 4));
299 kfree(r);
300 r = lg_wmab(WM_FAN_MODE, WM_SET, (m & 0xfffffff0) | value);
301 kfree(r);
302
303 return count;
304}
305
306static ssize_t fan_mode_show(struct device *dev,
307 struct device_attribute *attr, char *buffer)
308{
309 unsigned int status;
310 union acpi_object *r;
311
312 r = lg_wmab(WM_FAN_MODE, WM_GET, 0);
313 if (!r)
314 return -EIO;
315
316 if (r->type != ACPI_TYPE_INTEGER) {
317 kfree(r);
318 return -EIO;
319 }
320
321 status = r->integer.value & 0x01;
322 kfree(r);
323
324 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
325}
326
327static ssize_t usb_charge_store(struct device *dev,
328 struct device_attribute *attr,
329 const char *buffer, size_t count)
330{
331 bool value;
332 union acpi_object *r;
333 int ret;
334
335 ret = kstrtobool(buffer, &value);
336 if (ret)
337 return ret;
338
339 r = lg_wmbb(WMBB_USB_CHARGE, WM_SET, value);
340 if (!r)
341 return -EIO;
342
343 kfree(r);
344 return count;
345}
346
347static ssize_t usb_charge_show(struct device *dev,
348 struct device_attribute *attr, char *buffer)
349{
350 unsigned int status;
351 union acpi_object *r;
352
353 r = lg_wmbb(WMBB_USB_CHARGE, WM_GET, 0);
354 if (!r)
355 return -EIO;
356
357 if (r->type != ACPI_TYPE_BUFFER) {
358 kfree(r);
359 return -EIO;
360 }
361
362 status = !!r->buffer.pointer[0x10];
363
364 kfree(r);
365
366 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
367}
368
369static ssize_t reader_mode_store(struct device *dev,
370 struct device_attribute *attr,
371 const char *buffer, size_t count)
372{
373 bool value;
374 union acpi_object *r;
375 int ret;
376
377 ret = kstrtobool(buffer, &value);
378 if (ret)
379 return ret;
380
381 r = lg_wmab(WM_READER_MODE, WM_SET, value);
382 if (!r)
383 return -EIO;
384
385 kfree(r);
386 return count;
387}
388
389static ssize_t reader_mode_show(struct device *dev,
390 struct device_attribute *attr, char *buffer)
391{
392 unsigned int status;
393 union acpi_object *r;
394
395 r = lg_wmab(WM_READER_MODE, WM_GET, 0);
396 if (!r)
397 return -EIO;
398
399 if (r->type != ACPI_TYPE_INTEGER) {
400 kfree(r);
401 return -EIO;
402 }
403
404 status = !!r->integer.value;
405
406 kfree(r);
407
408 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
409}
410
411static ssize_t fn_lock_store(struct device *dev,
412 struct device_attribute *attr,
413 const char *buffer, size_t count)
414{
415 bool value;
416 union acpi_object *r;
417 int ret;
418
419 ret = kstrtobool(buffer, &value);
420 if (ret)
421 return ret;
422
423 r = lg_wmab(WM_FN_LOCK, WM_SET, value);
424 if (!r)
425 return -EIO;
426
427 kfree(r);
428 return count;
429}
430
431static ssize_t fn_lock_show(struct device *dev,
432 struct device_attribute *attr, char *buffer)
433{
434 unsigned int status;
435 union acpi_object *r;
436
437 r = lg_wmab(WM_FN_LOCK, WM_GET, 0);
438 if (!r)
439 return -EIO;
440
441 if (r->type != ACPI_TYPE_BUFFER) {
442 kfree(r);
443 return -EIO;
444 }
445
446 status = !!r->buffer.pointer[0];
447 kfree(r);
448
449 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
450}
451
452static ssize_t battery_care_limit_store(struct device *dev,
453 struct device_attribute *attr,
454 const char *buffer, size_t count)
455{
456 unsigned long value;
457 int ret;
458
459 ret = kstrtoul(buffer, 10, &value);
460 if (ret)
461 return ret;
462
463 if (value == 100 || value == 80) {
464 union acpi_object *r;
465
466 r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
467 if (!r)
468 return -EIO;
469
470 kfree(r);
471 return count;
472 }
473
474 return -EINVAL;
475}
476
477static ssize_t battery_care_limit_show(struct device *dev,
478 struct device_attribute *attr,
479 char *buffer)
480{
481 unsigned int status;
482 union acpi_object *r;
483
484 r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
485 if (!r)
486 return -EIO;
487
488 if (r->type != ACPI_TYPE_INTEGER) {
489 kfree(r);
490 return -EIO;
491 }
492
493 status = r->integer.value;
494 kfree(r);
495 if (status != 80 && status != 100)
496 status = 0;
497
498 return snprintf(buffer, PAGE_SIZE, "%d\n", status);
499}
500
501static DEVICE_ATTR_RW(fan_mode);
502static DEVICE_ATTR_RW(usb_charge);
503static DEVICE_ATTR_RW(reader_mode);
504static DEVICE_ATTR_RW(fn_lock);
505static DEVICE_ATTR_RW(battery_care_limit);
506
507static struct attribute *dev_attributes[] = {
508 &dev_attr_fan_mode.attr,
509 &dev_attr_usb_charge.attr,
510 &dev_attr_reader_mode.attr,
511 &dev_attr_fn_lock.attr,
512 &dev_attr_battery_care_limit.attr,
513 NULL
514};
515
516static const struct attribute_group dev_attribute_group = {
517 .attrs = dev_attributes,
518};
519
520static void tpad_led_set(struct led_classdev *cdev,
521 enum led_brightness brightness)
522{
523 union acpi_object *r;
524
525 r = lg_wmab(WM_TLED, WM_SET, brightness > LED_OFF);
526 kfree(r);
527}
528
529static enum led_brightness tpad_led_get(struct led_classdev *cdev)
530{
531 return ggov(GOV_TLED) > 0 ? LED_ON : LED_OFF;
532}
533
534static LED_DEVICE(tpad_led, 1);
535
536static void kbd_backlight_set(struct led_classdev *cdev,
537 enum led_brightness brightness)
538{
539 u32 val;
540 union acpi_object *r;
541
542 val = 0x22;
543 if (brightness <= LED_OFF)
544 val = 0;
545 if (brightness >= LED_FULL)
546 val = 0x24;
547 r = lg_wmab(WM_KEY_LIGHT, WM_SET, val);
548 kfree(r);
549}
550
551static enum led_brightness kbd_backlight_get(struct led_classdev *cdev)
552{
553 union acpi_object *r;
554 int val;
555
556 r = lg_wmab(WM_KEY_LIGHT, WM_GET, 0);
557
558 if (!r)
559 return LED_OFF;
560
561 if (r->type != ACPI_TYPE_BUFFER || r->buffer.pointer[1] != 0x05) {
562 kfree(r);
563 return LED_OFF;
564 }
565
566 switch (r->buffer.pointer[0] & 0x27) {
567 case 0x24:
568 val = LED_FULL;
569 break;
570 case 0x22:
571 val = LED_HALF;
572 break;
573 default:
574 val = LED_OFF;
575 }
576
577 kfree(r);
578
579 return val;
580}
581
582static LED_DEVICE(kbd_backlight, 255);
583
584static void wmi_input_destroy(void)
585{
586 if (inited & INIT_INPUT_WMI_2)
587 wmi_remove_notify_handler(WMI_EVENT_GUID2);
588
589 if (inited & INIT_INPUT_WMI_0)
590 wmi_remove_notify_handler(WMI_EVENT_GUID0);
591
592 if (inited & INIT_SPARSE_KEYMAP)
593 input_unregister_device(wmi_input_dev);
594
595 inited &= ~(INIT_INPUT_WMI_0 | INIT_INPUT_WMI_2 | INIT_SPARSE_KEYMAP);
596}
597
598static struct platform_driver pf_driver = {
599 .driver = {
600 .name = PLATFORM_NAME,
601 }
602};
603
604static int acpi_add(struct acpi_device *device)
605{
606 int ret;
607
608 if (pf_device)
609 return 0;
610
611 ret = platform_driver_register(&pf_driver);
612 if (ret)
613 return ret;
614
615 pf_device = platform_device_register_simple(PLATFORM_NAME,
616 PLATFORM_DEVID_NONE,
617 NULL, 0);
618 if (IS_ERR(pf_device)) {
619 ret = PTR_ERR(pf_device);
620 pf_device = NULL;
621 pr_err("unable to register platform device\n");
622 goto out_platform_registered;
623 }
624
625 ret = sysfs_create_group(&pf_device->dev.kobj, &dev_attribute_group);
626 if (ret)
627 goto out_platform_device;
628
629 if (!led_classdev_register(&pf_device->dev, &kbd_backlight))
630 inited |= INIT_KBD_LED;
631
632 if (!led_classdev_register(&pf_device->dev, &tpad_led))
633 inited |= INIT_TPAD_LED;
634
635 wmi_input_setup();
636
637 return 0;
638
639out_platform_device:
640 platform_device_unregister(pf_device);
641out_platform_registered:
642 platform_driver_unregister(&pf_driver);
643 return ret;
644}
645
646static int acpi_remove(struct acpi_device *device)
647{
648 sysfs_remove_group(&pf_device->dev.kobj, &dev_attribute_group);
649 if (inited & INIT_KBD_LED)
650 led_classdev_unregister(&kbd_backlight);
651
652 if (inited & INIT_TPAD_LED)
653 led_classdev_unregister(&tpad_led);
654
655 wmi_input_destroy();
656 platform_device_unregister(pf_device);
657 pf_device = NULL;
658 platform_driver_unregister(&pf_driver);
659
660 return 0;
661}
662
663static const struct acpi_device_id device_ids[] = {
664 {"LGEX0815", 0},
665 {"", 0}
666};
667MODULE_DEVICE_TABLE(acpi, device_ids);
668
669static struct acpi_driver acpi_driver = {
670 .name = "LG Gram Laptop Support",
671 .class = "lg-laptop",
672 .ids = device_ids,
673 .ops = {
674 .add = acpi_add,
675 .remove = acpi_remove,
676 .notify = acpi_notify,
677 },
678 .owner = THIS_MODULE,
679};
680
681static int __init acpi_init(void)
682{
683 int result;
684
685 result = acpi_bus_register_driver(&acpi_driver);
686 if (result < 0) {
687 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error registering driver\n"));
688 return -ENODEV;
689 }
690
691 return 0;
692}
693
694static void __exit acpi_exit(void)
695{
696 acpi_bus_unregister_driver(&acpi_driver);
697}
698
699module_init(acpi_init);
700module_exit(acpi_exit);