drivers/platform/x86/intel/hid.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Intel HID event & 5 button array driver
   4  *
   5  *  Copyright (C) 2015 Alex Hung <alex.hung@canonical.com>
   6  *  Copyright (C) 2015 Andrew Lutomirski <luto@kernel.org>
   7  */
   8
   9 #include <linux/acpi.h>
  10 #include <linux/dmi.h>
  11 #include <linux/input.h>
  12 #include <linux/input/sparse-keymap.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/suspend.h>
  17 #include "../dual_accel_detect.h"
  18
  19 enum intel_hid_tablet_sw_mode {
  20         TABLET_SW_AUTO = -1,
  21         TABLET_SW_OFF  = 0,
  22         TABLET_SW_AT_EVENT,
  23         TABLET_SW_AT_PROBE,
  24 };
  25
  26 static bool enable_5_button_array;
  27 module_param(enable_5_button_array, bool, 0444);
  28 MODULE_PARM_DESC(enable_5_button_array,
  29         "Enable 5 Button Array support. "
  30         "If you need this please report this to: platform-driver-x86@vger.kernel.org");
  31
  32 static int enable_sw_tablet_mode = TABLET_SW_AUTO;
  33 module_param(enable_sw_tablet_mode, int, 0444);
  34 MODULE_PARM_DESC(enable_sw_tablet_mode,
  35         "Enable SW_TABLET_MODE reporting -1:auto 0:off 1:at-first-event 2:at-probe. "
  36         "If you need this please report this to: platform-driver-x86@vger.kernel.org");
  37
  38 /* When NOT in tablet mode, VGBS returns with the flag 0x40 */
  39 #define TABLET_MODE_FLAG BIT(6)
  40
  41 MODULE_LICENSE("GPL");
  42 MODULE_AUTHOR("Alex Hung");
  43
  44 static const struct acpi_device_id intel_hid_ids[] = {
  45         {"INT33D5", 0},
  46         {"INTC1051", 0},
  47         {"INTC1054", 0},
  48         {"INTC1070", 0},
  49         {"INTC1076", 0},
  50         {"INTC1077", 0},
  51         {"INTC1078", 0},
  52         {"INTC107B", 0},
  53         {"INTC10CB", 0},
  54         {"", 0},
  55 };
  56 MODULE_DEVICE_TABLE(acpi, intel_hid_ids);
  57
  58 /* In theory, these are HID usages. */
  59 static const struct key_entry intel_hid_keymap[] = {
  60         /* 1: LSuper (Page 0x07, usage 0xE3) -- unclear what to do */
  61         /* 2: Toggle SW_ROTATE_LOCK -- easy to implement if seen in wild */
  62         { KE_KEY, 3, { KEY_NUMLOCK } },
  63         { KE_KEY, 4, { KEY_HOME } },
  64         { KE_KEY, 5, { KEY_END } },
  65         { KE_KEY, 6, { KEY_PAGEUP } },
  66         { KE_KEY, 7, { KEY_PAGEDOWN } },
  67         { KE_KEY, 8, { KEY_RFKILL } },
  68         { KE_KEY, 9, { KEY_POWER } },
  69         { KE_KEY, 11, { KEY_SLEEP } },
  70         /* 13 has two different meanings in the spec -- ignore it. */
  71         { KE_KEY, 14, { KEY_STOPCD } },
  72         { KE_KEY, 15, { KEY_PLAYPAUSE } },
  73         { KE_KEY, 16, { KEY_MUTE } },
  74         { KE_KEY, 17, { KEY_VOLUMEUP } },
  75         { KE_KEY, 18, { KEY_VOLUMEDOWN } },
  76         { KE_KEY, 19, { KEY_BRIGHTNESSUP } },
  77         { KE_KEY, 20, { KEY_BRIGHTNESSDOWN } },
  78         /* 27: wake -- needs special handling */
  79         { KE_END },
  80 };
  81
  82 /* 5 button array notification value. */
  83 static const struct key_entry intel_array_keymap[] = {
  84         { KE_KEY,    0xC2, { KEY_LEFTMETA } },                /* Press */
  85         { KE_IGNORE, 0xC3, { KEY_LEFTMETA } },                /* Release */
  86         { KE_KEY,    0xC4, { KEY_VOLUMEUP } },                /* Press */
  87         { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } },                /* Release */
  88         { KE_KEY,    0xC6, { KEY_VOLUMEDOWN } },              /* Press */
  89         { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },              /* Release */
  90         { KE_KEY,    0xC8, { KEY_ROTATE_LOCK_TOGGLE } },      /* Press */
  91         { KE_IGNORE, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } },      /* Release */
  92         { KE_KEY,    0xCE, { KEY_POWER } },                   /* Press */
  93         { KE_IGNORE, 0xCF, { KEY_POWER } },                   /* Release */
  94         { KE_END },
  95 };
  96
  97 static const struct dmi_system_id button_array_table[] = {
  98         {
  99                 .ident = "Wacom MobileStudio Pro 13",
 100                 .matches = {
 101                         DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
 102                         DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 13"),
 103                 },
 104         },
 105         {
 106                 .ident = "Wacom MobileStudio Pro 16",
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "Wacom Co.,Ltd"),
 109                         DMI_MATCH(DMI_PRODUCT_NAME, "Wacom MobileStudio Pro 16"),
 110                 },
 111         },
 112         {
 113                 .ident = "HP Spectre x2 (2015)",
 114                 .matches = {
 115                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 116                         DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x2 Detachable"),
 117                 },
 118         },
 119         {
 120                 .ident = "Lenovo ThinkPad X1 Tablet Gen 2",
 121                 .matches = {
 122                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 123                         DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Tablet Gen 2"),
 124                 },
 125         },
 126         {
 127                 .ident = "Microsoft Surface Go 3",
 128                 .matches = {
 129                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 130                         DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
 131                 },
 132         },
 133         { }
 134 };
 135
 136 /*
 137  * Some convertible use the intel-hid ACPI interface to report SW_TABLET_MODE,
 138  * these need to be compared via a DMI based authorization list because some
 139  * models have unreliable VGBS return which could cause incorrect
 140  * SW_TABLET_MODE report.
 141  */
 142 static const struct dmi_system_id dmi_vgbs_allow_list[] = {
 143         {
 144                 .matches = {
 145                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 146                         DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible 15-df0xxx"),
 147                 },
 148         },
 149         {
 150                 .matches = {
 151                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 152                         DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go"),
 153                 },
 154         },
 155         {
 156                 .matches = {
 157                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 158                         DMI_MATCH(DMI_PRODUCT_NAME, "HP Elite Dragonfly G2 Notebook PC"),
 159                 },
 160         },
 161         { }
 162 };
 163
 164 /*
 165  * Some devices, even non convertible ones, can send incorrect SW_TABLET_MODE
 166  * reports. Accept such reports only from devices in this list.
 167  */
 168 static const struct dmi_system_id dmi_auto_add_switch[] = {
 169         {
 170                 .matches = {
 171                         DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
 172                 },
 173         },
 174         {
 175                 .matches = {
 176                         DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
 177                 },
 178         },
 179         {} /* Array terminator */
 180 };
 181
 182 struct intel_hid_priv {
 183         struct input_dev *input_dev;
 184         struct input_dev *array;
 185         struct input_dev *switches;
 186         bool wakeup_mode;
 187 };
 188
 189 #define HID_EVENT_FILTER_UUID   "eeec56b3-4442-408f-a792-4edd4d758054"
 190
 191 enum intel_hid_dsm_fn_codes {
 192         INTEL_HID_DSM_FN_INVALID,
 193         INTEL_HID_DSM_BTNL_FN,
 194         INTEL_HID_DSM_HDMM_FN,
 195         INTEL_HID_DSM_HDSM_FN,
 196         INTEL_HID_DSM_HDEM_FN,
 197         INTEL_HID_DSM_BTNS_FN,
 198         INTEL_HID_DSM_BTNE_FN,
 199         INTEL_HID_DSM_HEBC_V1_FN,
 200         INTEL_HID_DSM_VGBS_FN,
 201         INTEL_HID_DSM_HEBC_V2_FN,
 202         INTEL_HID_DSM_FN_MAX
 203 };
 204
 205 static const char *intel_hid_dsm_fn_to_method[INTEL_HID_DSM_FN_MAX] = {
 206         NULL,
 207         "BTNL",
 208         "HDMM",
 209         "HDSM",
 210         "HDEM",
 211         "BTNS",
 212         "BTNE",
 213         "HEBC",
 214         "VGBS",
 215         "HEBC"
 216 };
 217
 218 static unsigned long long intel_hid_dsm_fn_mask;
 219 static guid_t intel_dsm_guid;
 220
 221 static bool intel_hid_execute_method(acpi_handle handle,
 222                                      enum intel_hid_dsm_fn_codes fn_index,
 223                                      unsigned long long arg)
 224 {
 225         union acpi_object *obj, argv4, req;
 226         acpi_status status;
 227         char *method_name;
 228
 229         if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
 230             fn_index >= INTEL_HID_DSM_FN_MAX)
 231                 return false;
 232
 233         method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
 234
 235         if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
 236                 goto skip_dsm_exec;
 237
 238         /* All methods expects a package with one integer element */
 239         req.type = ACPI_TYPE_INTEGER;
 240         req.integer.value = arg;
 241
 242         argv4.type = ACPI_TYPE_PACKAGE;
 243         argv4.package.count = 1;
 244         argv4.package.elements = &req;
 245
 246         obj = acpi_evaluate_dsm(handle, &intel_dsm_guid, 1, fn_index, &argv4);
 247         if (obj) {
 248                 acpi_handle_debug(handle, "Exec DSM Fn code: %d[%s] success\n",
 249                                   fn_index, method_name);
 250                 ACPI_FREE(obj);
 251                 return true;
 252         }
 253
 254 skip_dsm_exec:
 255         status = acpi_execute_simple_method(handle, method_name, arg);
 256         if (ACPI_SUCCESS(status))
 257                 return true;
 258
 259         return false;
 260 }
 261
 262 static bool intel_hid_evaluate_method(acpi_handle handle,
 263                                       enum intel_hid_dsm_fn_codes fn_index,
 264                                       unsigned long long *result)
 265 {
 266         union acpi_object *obj;
 267         acpi_status status;
 268         char *method_name;
 269
 270         if (fn_index <= INTEL_HID_DSM_FN_INVALID ||
 271             fn_index >= INTEL_HID_DSM_FN_MAX)
 272                 return false;
 273
 274         method_name = (char *)intel_hid_dsm_fn_to_method[fn_index];
 275
 276         if (!(intel_hid_dsm_fn_mask & BIT(fn_index)))
 277                 goto skip_dsm_eval;
 278
 279         obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid,
 280                                       1, fn_index,
 281                                       NULL,  ACPI_TYPE_INTEGER);
 282         if (obj) {
 283                 *result = obj->integer.value;
 284                 acpi_handle_debug(handle,
 285                                   "Eval DSM Fn code: %d[%s] results: 0x%llx\n",
 286                                   fn_index, method_name, *result);
 287                 ACPI_FREE(obj);
 288                 return true;
 289         }
 290
 291 skip_dsm_eval:
 292         status = acpi_evaluate_integer(handle, method_name, NULL, result);
 293         if (ACPI_SUCCESS(status))
 294                 return true;
 295
 296         return false;
 297 }
 298
 299 static void intel_hid_init_dsm(acpi_handle handle)
 300 {
 301         union acpi_object *obj;
 302
 303         guid_parse(HID_EVENT_FILTER_UUID, &intel_dsm_guid);
 304
 305         obj = acpi_evaluate_dsm_typed(handle, &intel_dsm_guid, 1, 0, NULL,
 306                                       ACPI_TYPE_BUFFER);
 307         if (obj) {
 308                 switch (obj->buffer.length) {
 309                 default:
 310                 case 2:
 311                         intel_hid_dsm_fn_mask = *(u16 *)obj->buffer.pointer;
 312                         break;
 313                 case 1:
 314                         intel_hid_dsm_fn_mask = *obj->buffer.pointer;
 315                         break;
 316                 case 0:
 317                         acpi_handle_warn(handle, "intel_hid_dsm_fn_mask length is zero\n");
 318                         intel_hid_dsm_fn_mask = 0;
 319                         break;
 320                 }
 321                 ACPI_FREE(obj);
 322         }
 323
 324         acpi_handle_debug(handle, "intel_hid_dsm_fn_mask = %llx\n",
 325                           intel_hid_dsm_fn_mask);
 326 }
 327
 328 static int intel_hid_set_enable(struct device *device, bool enable)
 329 {
 330         acpi_handle handle = ACPI_HANDLE(device);
 331
 332         /* Enable|disable features - power button is always enabled */
 333         if (!intel_hid_execute_method(handle, INTEL_HID_DSM_HDSM_FN,
 334                                       enable)) {
 335                 dev_warn(device, "failed to %sable hotkeys\n",
 336                          enable ? "en" : "dis");
 337                 return -EIO;
 338         }
 339
 340         return 0;
 341 }
 342
 343 static void intel_button_array_enable(struct device *device, bool enable)
 344 {
 345         struct intel_hid_priv *priv = dev_get_drvdata(device);
 346         acpi_handle handle = ACPI_HANDLE(device);
 347         unsigned long long button_cap;
 348         acpi_status status;
 349
 350         if (!priv->array)
 351                 return;
 352
 353         /* Query supported platform features */
 354         status = acpi_evaluate_integer(handle, "BTNC", NULL, &button_cap);
 355         if (ACPI_FAILURE(status)) {
 356                 dev_warn(device, "failed to get button capability\n");
 357                 return;
 358         }
 359
 360         /* Enable|disable features - power button is always enabled */
 361         if (!intel_hid_execute_method(handle, INTEL_HID_DSM_BTNE_FN,
 362                                       enable ? button_cap : 1))
 363                 dev_warn(device, "failed to set button capability\n");
 364 }
 365
 366 static int intel_hid_pm_prepare(struct device *device)
 367 {
 368         if (device_may_wakeup(device)) {
 369                 struct intel_hid_priv *priv = dev_get_drvdata(device);
 370
 371                 priv->wakeup_mode = true;
 372         }
 373         return 0;
 374 }
 375
 376 static void intel_hid_pm_complete(struct device *device)
 377 {
 378         struct intel_hid_priv *priv = dev_get_drvdata(device);
 379
 380         priv->wakeup_mode = false;
 381 }
 382
 383 static int intel_hid_pl_suspend_handler(struct device *device)
 384 {
 385         intel_button_array_enable(device, false);
 386
 387         if (!pm_suspend_no_platform())
 388                 intel_hid_set_enable(device, false);
 389
 390         return 0;
 391 }
 392
 393 static int intel_hid_pl_resume_handler(struct device *device)
 394 {
 395         intel_hid_pm_complete(device);
 396
 397         if (!pm_suspend_no_platform())
 398                 intel_hid_set_enable(device, true);
 399
 400         intel_button_array_enable(device, true);
 401         return 0;
 402 }
 403
 404 static const struct dev_pm_ops intel_hid_pl_pm_ops = {
 405         .prepare = intel_hid_pm_prepare,
 406         .complete = intel_hid_pm_complete,
 407         .freeze  = intel_hid_pl_suspend_handler,
 408         .thaw  = intel_hid_pl_resume_handler,
 409         .restore  = intel_hid_pl_resume_handler,
 410         .suspend  = intel_hid_pl_suspend_handler,
 411         .resume  = intel_hid_pl_resume_handler,
 412 };
 413
 414 static int intel_hid_input_setup(struct platform_device *device)
 415 {
 416         struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 417         int ret;
 418
 419         priv->input_dev = devm_input_allocate_device(&device->dev);
 420         if (!priv->input_dev)
 421                 return -ENOMEM;
 422
 423         ret = sparse_keymap_setup(priv->input_dev, intel_hid_keymap, NULL);
 424         if (ret)
 425                 return ret;
 426
 427         priv->input_dev->name = "Intel HID events";
 428         priv->input_dev->id.bustype = BUS_HOST;
 429
 430         return input_register_device(priv->input_dev);
 431 }
 432
 433 static int intel_button_array_input_setup(struct platform_device *device)
 434 {
 435         struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 436         int ret;
 437
 438         /* Setup input device for 5 button array */
 439         priv->array = devm_input_allocate_device(&device->dev);
 440         if (!priv->array)
 441                 return -ENOMEM;
 442
 443         ret = sparse_keymap_setup(priv->array, intel_array_keymap, NULL);
 444         if (ret)
 445                 return ret;
 446
 447         priv->array->name = "Intel HID 5 button array";
 448         priv->array->id.bustype = BUS_HOST;
 449
 450         return input_register_device(priv->array);
 451 }
 452
 453 static int intel_hid_switches_setup(struct platform_device *device)
 454 {
 455         struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 456
 457         /* Setup input device for switches */
 458         priv->switches = devm_input_allocate_device(&device->dev);
 459         if (!priv->switches)
 460                 return -ENOMEM;
 461
 462         __set_bit(EV_SW, priv->switches->evbit);
 463         __set_bit(SW_TABLET_MODE, priv->switches->swbit);
 464
 465         priv->switches->name = "Intel HID switches";
 466         priv->switches->id.bustype = BUS_HOST;
 467         return input_register_device(priv->switches);
 468 }
 469
 470 static void report_tablet_mode_state(struct platform_device *device)
 471 {
 472         struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 473         acpi_handle handle = ACPI_HANDLE(&device->dev);
 474         unsigned long long vgbs;
 475         int m;
 476
 477         if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_VGBS_FN, &vgbs))
 478                 return;
 479
 480         m = !(vgbs & TABLET_MODE_FLAG);
 481         input_report_switch(priv->switches, SW_TABLET_MODE, m);
 482         input_sync(priv->switches);
 483 }
 484
 485 static bool report_tablet_mode_event(struct input_dev *input_dev, u32 event)
 486 {
 487         if (!input_dev)
 488                 return false;
 489
 490         switch (event) {
 491         case 0xcc:
 492                 input_report_switch(input_dev, SW_TABLET_MODE, 1);
 493                 input_sync(input_dev);
 494                 return true;
 495         case 0xcd:
 496                 input_report_switch(input_dev, SW_TABLET_MODE, 0);
 497                 input_sync(input_dev);
 498                 return true;
 499         default:
 500                 return false;
 501         }
 502 }
 503
 504 static void notify_handler(acpi_handle handle, u32 event, void *context)
 505 {
 506         struct platform_device *device = context;
 507         struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 508         unsigned long long ev_index;
 509         struct key_entry *ke;
 510         int err;
 511
 512         /*
 513          * Some convertible have unreliable VGBS return which could cause incorrect
 514          * SW_TABLET_MODE report, in these cases we enable support when receiving
 515          * the first event instead of during driver setup.
 516          */
 517         if (!priv->switches && enable_sw_tablet_mode == TABLET_SW_AT_EVENT &&
 518             (event == 0xcc || event == 0xcd)) {
 519                 dev_info(&device->dev, "switch event received, enable switches supports\n");
 520                 err = intel_hid_switches_setup(device);
 521                 if (err)
 522                         pr_err("Failed to setup Intel HID switches\n");
 523         }
 524
 525         if (priv->wakeup_mode) {
 526                 /*
 527                  * Needed for wakeup from suspend-to-idle to work on some
 528                  * platforms that don't expose the 5-button array, but still
 529                  * send notifies with the power button event code to this
 530                  * device object on power button actions while suspended.
 531                  */
 532                 if (event == 0xce)
 533                         goto wakeup;
 534
 535                 /*
 536                  * Some devices send (duplicate) tablet-mode events when moved
 537                  * around even though the mode has not changed; and they do this
 538                  * even when suspended.
 539                  * Update the switch state in case it changed and then return
 540                  * without waking up to avoid spurious wakeups.
 541                  */
 542                 if (event == 0xcc || event == 0xcd) {
 543                         report_tablet_mode_event(priv->switches, event);
 544                         return;
 545                 }
 546
 547                 /* Wake up on 5-button array events only. */
 548                 if (event == 0xc0 || !priv->array)
 549                         return;
 550
 551                 ke = sparse_keymap_entry_from_scancode(priv->array, event);
 552                 if (!ke) {
 553                         dev_info(&device->dev, "unknown event 0x%x\n", event);
 554                         return;
 555                 }
 556
 557                 if (ke->type == KE_IGNORE)
 558                         return;
 559
 560 wakeup:
 561                 pm_wakeup_hard_event(&device->dev);
 562
 563                 return;
 564         }
 565
 566         /*
 567          * Needed for suspend to work on some platforms that don't expose
 568          * the 5-button array, but still send notifies with power button
 569          * event code to this device object on power button actions.
 570          *
 571          * Report the power button press and release.
 572          */
 573         if (!priv->array) {
 574                 if (event == 0xce) {
 575                         input_report_key(priv->input_dev, KEY_POWER, 1);
 576                         input_sync(priv->input_dev);
 577                         return;
 578                 }
 579
 580                 if (event == 0xcf) {
 581                         input_report_key(priv->input_dev, KEY_POWER, 0);
 582                         input_sync(priv->input_dev);
 583                         return;
 584                 }
 585         }
 586
 587         if (report_tablet_mode_event(priv->switches, event))
 588                 return;
 589
 590         /* 0xC0 is for HID events, other values are for 5 button array */
 591         if (event != 0xc0) {
 592                 if (!priv->array ||
 593                     !sparse_keymap_report_event(priv->array, event, 1, true))
 594                         dev_dbg(&device->dev, "unknown event 0x%x\n", event);
 595                 return;
 596         }
 597
 598         if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDEM_FN,
 599                                        &ev_index)) {
 600                 dev_warn(&device->dev, "failed to get event index\n");
 601                 return;
 602         }
 603
 604         if (!sparse_keymap_report_event(priv->input_dev, ev_index, 1, true))
 605                 dev_dbg(&device->dev, "unknown event index 0x%llx\n",
 606                          ev_index);
 607 }
 608
 609 static bool button_array_present(struct platform_device *device)
 610 {
 611         acpi_handle handle = ACPI_HANDLE(&device->dev);
 612         unsigned long long event_cap;
 613
 614         if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V2_FN,
 615                                       &event_cap)) {
 616                 /* Check presence of 5 button array or v2 power button */
 617                 if (event_cap & 0x60000)
 618                         return true;
 619         }
 620
 621         if (intel_hid_evaluate_method(handle, INTEL_HID_DSM_HEBC_V1_FN,
 622                                       &event_cap)) {
 623                 if (event_cap & 0x20000)
 624                         return true;
 625         }
 626
 627         if (enable_5_button_array || dmi_check_system(button_array_table))
 628                 return true;
 629
 630         return false;
 631 }
 632
 633 static int intel_hid_probe(struct platform_device *device)
 634 {
 635         acpi_handle handle = ACPI_HANDLE(&device->dev);
 636         unsigned long long mode, dummy;
 637         struct intel_hid_priv *priv;
 638         acpi_status status;
 639         int err;
 640
 641         intel_hid_init_dsm(handle);
 642
 643         if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_HDMM_FN, &mode)) {
 644                 dev_warn(&device->dev, "failed to read mode\n");
 645                 return -ENODEV;
 646         }
 647
 648         if (mode != 0) {
 649                 /*
 650                  * This driver only implements "simple" mode.  There appear
 651                  * to be no other modes, but we should be paranoid and check
 652                  * for compatibility.
 653                  */
 654                 dev_info(&device->dev, "platform is not in simple mode\n");
 655                 return -ENODEV;
 656         }
 657
 658         priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
 659         if (!priv)
 660                 return -ENOMEM;
 661         dev_set_drvdata(&device->dev, priv);
 662
 663         /* See dual_accel_detect.h for more info on the dual_accel check. */
 664         if (enable_sw_tablet_mode == TABLET_SW_AUTO) {
 665                 if (dmi_check_system(dmi_vgbs_allow_list))
 666                         enable_sw_tablet_mode = TABLET_SW_AT_PROBE;
 667                 else if (dmi_check_system(dmi_auto_add_switch) && !dual_accel_detect())
 668                         enable_sw_tablet_mode = TABLET_SW_AT_EVENT;
 669                 else
 670                         enable_sw_tablet_mode = TABLET_SW_OFF;
 671         }
 672
 673         err = intel_hid_input_setup(device);
 674         if (err) {
 675                 pr_err("Failed to setup Intel HID hotkeys\n");
 676                 return err;
 677         }
 678
 679         /* Setup 5 button array */
 680         if (button_array_present(device)) {
 681                 dev_info(&device->dev, "platform supports 5 button array\n");
 682                 err = intel_button_array_input_setup(device);
 683                 if (err)
 684                         pr_err("Failed to setup Intel 5 button array hotkeys\n");
 685         }
 686
 687         /* Setup switches for devices that we know VGBS return correctly */
 688         if (enable_sw_tablet_mode == TABLET_SW_AT_PROBE) {
 689                 dev_info(&device->dev, "platform supports switches\n");
 690                 err = intel_hid_switches_setup(device);
 691                 if (err)
 692                         pr_err("Failed to setup Intel HID switches\n");
 693                 else
 694                         report_tablet_mode_state(device);
 695         }
 696
 697         status = acpi_install_notify_handler(handle,
 698                                              ACPI_DEVICE_NOTIFY,
 699                                              notify_handler,
 700                                              device);
 701         if (ACPI_FAILURE(status))
 702                 return -EBUSY;
 703
 704         err = intel_hid_set_enable(&device->dev, true);
 705         if (err)
 706                 goto err_remove_notify;
 707
 708         intel_button_array_enable(&device->dev, true);
 709
 710         /*
 711          * Call button load method to enable HID power button
 712          * Always do this since it activates events on some devices without
 713          * a button array too.
 714          */
 715         if (!intel_hid_evaluate_method(handle, INTEL_HID_DSM_BTNL_FN, &dummy))
 716                 dev_warn(&device->dev, "failed to enable HID power button\n");
 717
 718         device_init_wakeup(&device->dev, true);
 719         /*
 720          * In order for system wakeup to work, the EC GPE has to be marked as
 721          * a wakeup one, so do that here (this setting will persist, but it has
 722          * no effect until the wakeup mask is set for the EC GPE).
 723          */
 724         acpi_ec_mark_gpe_for_wake();
 725         return 0;
 726
 727 err_remove_notify:
 728         acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
 729
 730         return err;
 731 }
 732
 733 static void intel_hid_remove(struct platform_device *device)
 734 {
 735         acpi_handle handle = ACPI_HANDLE(&device->dev);
 736
 737         device_init_wakeup(&device->dev, false);
 738         acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
 739         intel_hid_set_enable(&device->dev, false);
 740         intel_button_array_enable(&device->dev, false);
 741 }
 742
 743 static struct platform_driver intel_hid_pl_driver = {
 744         .driver = {
 745                 .name = "intel-hid",
 746                 .acpi_match_table = intel_hid_ids,
 747                 .pm = &intel_hid_pl_pm_ops,
 748         },
 749         .probe = intel_hid_probe,
 750         .remove_new = intel_hid_remove,
 751 };
 752
 753 /*
 754  * Unfortunately, some laptops provide a _HID="INT33D5" device with
 755  * _CID="PNP0C02".  This causes the pnpacpi scan driver to claim the
 756  * ACPI node, so no platform device will be created.  The pnpacpi
 757  * driver rejects this device in subsequent processing, so no physical
 758  * node is created at all.
 759  *
 760  * As a workaround until the ACPI core figures out how to handle
 761  * this corner case, manually ask the ACPI platform device code to
 762  * claim the ACPI node.
 763  */
 764 static acpi_status __init
 765 check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
 766 {
 767         const struct acpi_device_id *ids = context;
 768         struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
 769
 770         if (dev && acpi_match_device_ids(dev, ids) == 0)
 771                 if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
 772                         dev_info(&dev->dev,
 773                                  "intel-hid: created platform device\n");
 774
 775         return AE_OK;
 776 }
 777
 778 static int __init intel_hid_init(void)
 779 {
 780         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 781                             ACPI_UINT32_MAX, check_acpi_dev, NULL,
 782                             (void *)intel_hid_ids, NULL);
 783
 784         return platform_driver_register(&intel_hid_pl_driver);
 785 }
 786 module_init(intel_hid_init);
 787
 788 static void __exit intel_hid_exit(void)
 789 {
 790         platform_driver_unregister(&intel_hid_pl_driver);
 791 }
 792 module_exit(intel_hid_exit);