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