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