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