drivers/platform/x86/lg-laptop.c

   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
  26 MODULE_AUTHOR("Matan Ziv-Av");
  27 MODULE_DESCRIPTION("LG WMI Hotkey Driver");
  28 MODULE_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
  55 MODULE_ALIAS("wmi:" WMI_EVENT_GUID0);
  56 MODULE_ALIAS("wmi:" WMI_EVENT_GUID1);
  57 MODULE_ALIAS("wmi:" WMI_EVENT_GUID2);
  58 MODULE_ALIAS("wmi:" WMI_EVENT_GUID3);
  59 MODULE_ALIAS("wmi:" WMI_METHOD_WMAB);
  60 MODULE_ALIAS("wmi:" WMI_METHOD_WMBB);
  61 MODULE_ALIAS("acpi*:LGEX0815:*");
  62
  63 static struct platform_device *pf_device;
  64 static struct input_dev *wmi_input_dev;
  65
  66 static 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
  74 static 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
  86 static 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
 126 static 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
 159 static 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
 197 static 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
 230 static 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
 262 static 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
 274 static 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
 306 static 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
 327 static 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
 347 static 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
 369 static 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
 389 static 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
 411 static 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
 431 static 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
 452 static 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
 477 static 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
 501 static DEVICE_ATTR_RW(fan_mode);
 502 static DEVICE_ATTR_RW(usb_charge);
 503 static DEVICE_ATTR_RW(reader_mode);
 504 static DEVICE_ATTR_RW(fn_lock);
 505 static DEVICE_ATTR_RW(battery_care_limit);
 506
 507 static 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
 516 static const struct attribute_group dev_attribute_group = {
 517         .attrs = dev_attributes,
 518 };
 519
 520 static 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
 529 static enum led_brightness tpad_led_get(struct led_classdev *cdev)
 530 {
 531         return ggov(GOV_TLED) > 0 ? LED_ON : LED_OFF;
 532 }
 533
 534 static LED_DEVICE(tpad_led, 1);
 535
 536 static 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
 551 static 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
 582 static LED_DEVICE(kbd_backlight, 255);
 583
 584 static 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
 598 static struct platform_driver pf_driver = {
 599         .driver = {
 600                    .name = PLATFORM_NAME,
 601         }
 602 };
 603
 604 static 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
 639 out_platform_device:
 640         platform_device_unregister(pf_device);
 641 out_platform_registered:
 642         platform_driver_unregister(&pf_driver);
 643         return ret;
 644 }
 645
 646 static 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
 663 static const struct acpi_device_id device_ids[] = {
 664         {"LGEX0815", 0},
 665         {"", 0}
 666 };
 667 MODULE_DEVICE_TABLE(acpi, device_ids);
 668
 669 static 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
 681 static 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
 694 static void __exit acpi_exit(void)
 695 {
 696         acpi_bus_unregister_driver(&acpi_driver);
 697 }
 698
 699 module_init(acpi_init);
 700 module_exit(acpi_exit);