1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * button.c - ACPI Button Driver 4 * 5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 7 */ 8 9 #define pr_fmt(fmt) "ACPI: button: " fmt 10 11 #include <linux/compiler.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/types.h> 16 #include <linux/proc_fs.h> 17 #include <linux/seq_file.h> 18 #include <linux/input.h> 19 #include <linux/slab.h> 20 #include <linux/acpi.h> 21 #include <linux/dmi.h> 22 #include <linux/platform_device.h> 23 #include <acpi/button.h> 24 25 #define ACPI_BUTTON_CLASS "button" 26 #define ACPI_BUTTON_FILE_STATE "state" 27 #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 28 #define ACPI_BUTTON_NOTIFY_WAKE 0x02 29 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 30 31 #define ACPI_BUTTON_CLASS_POWER "button/power" 32 #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button" 33 #define ACPI_BUTTON_TYPE_POWER 0x01 34 35 #define ACPI_BUTTON_CLASS_SLEEP "button/sleep" 36 #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button" 37 #define ACPI_BUTTON_TYPE_SLEEP 0x03 38 39 #define ACPI_BUTTON_CLASS_LID "button/lid" 40 #define ACPI_BUTTON_SUBCLASS_LID "lid" 41 #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" 42 #define ACPI_BUTTON_TYPE_LID 0x05 43 44 enum { 45 ACPI_BUTTON_LID_INIT_IGNORE, 46 ACPI_BUTTON_LID_INIT_OPEN, 47 ACPI_BUTTON_LID_INIT_METHOD, 48 ACPI_BUTTON_LID_INIT_DISABLED, 49 }; 50 51 static const char * const lid_init_state_str[] = { 52 [ACPI_BUTTON_LID_INIT_IGNORE] = "ignore", 53 [ACPI_BUTTON_LID_INIT_OPEN] = "open", 54 [ACPI_BUTTON_LID_INIT_METHOD] = "method", 55 [ACPI_BUTTON_LID_INIT_DISABLED] = "disabled", 56 }; 57 58 MODULE_AUTHOR("Paul Diefenbaugh"); 59 MODULE_DESCRIPTION("ACPI Button Driver"); 60 MODULE_LICENSE("GPL"); 61 62 static const struct acpi_device_id button_device_ids[] = { 63 {ACPI_BUTTON_HID_LID, ACPI_BUTTON_TYPE_LID}, 64 {ACPI_BUTTON_HID_SLEEP, ACPI_BUTTON_TYPE_SLEEP}, 65 {ACPI_BUTTON_HID_SLEEPF, ACPI_BUTTON_TYPE_SLEEP}, 66 {ACPI_BUTTON_HID_POWER, ACPI_BUTTON_TYPE_POWER}, 67 {ACPI_BUTTON_HID_POWERF, ACPI_BUTTON_TYPE_POWER}, 68 {"", 0}, 69 }; 70 MODULE_DEVICE_TABLE(acpi, button_device_ids); 71 72 /* Please keep this list sorted alphabetically by vendor and model */ 73 static const struct dmi_system_id dmi_lid_quirks[] = { 74 { 75 /* GP-electronic T701, _LID method points to a floating GPIO */ 76 .matches = { 77 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"), 78 DMI_MATCH(DMI_PRODUCT_NAME, "T701"), 79 DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"), 80 }, 81 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED, 82 }, 83 { 84 /* Nextbook Ares 8A tablet, _LID device always reports lid closed */ 85 .matches = { 86 DMI_MATCH(DMI_SYS_VENDOR, "Insyde"), 87 DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"), 88 DMI_MATCH(DMI_BIOS_VERSION, "M882"), 89 }, 90 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED, 91 }, 92 { 93 /* 94 * Lenovo Yoga 9 14ITL5, initial notification of the LID device 95 * never happens. 96 */ 97 .matches = { 98 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 99 DMI_MATCH(DMI_PRODUCT_NAME, "82BG"), 100 }, 101 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 102 }, 103 { 104 /* 105 * Medion Akoya E2215T, notification of the LID device only 106 * happens on close, not on open and _LID always returns closed. 107 */ 108 .matches = { 109 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), 110 DMI_MATCH(DMI_PRODUCT_NAME, "E2215T"), 111 }, 112 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 113 }, 114 { 115 /* 116 * Medion Akoya E2228T, notification of the LID device only 117 * happens on close, not on open and _LID always returns closed. 118 */ 119 .matches = { 120 DMI_MATCH(DMI_SYS_VENDOR, "MEDION"), 121 DMI_MATCH(DMI_PRODUCT_NAME, "E2228T"), 122 }, 123 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 124 }, 125 { 126 /* 127 * Razer Blade Stealth 13 late 2019, notification of the LID device 128 * only happens on close, not on open and _LID always returns closed. 129 */ 130 .matches = { 131 DMI_MATCH(DMI_SYS_VENDOR, "Razer"), 132 DMI_MATCH(DMI_PRODUCT_NAME, "Razer Blade Stealth 13 Late 2019"), 133 }, 134 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 135 }, 136 { 137 /* 138 * Razer Blade Pro 17 early 2020, notification of the LID device 139 * only happens on close, not on open and _LID keeps returning closed. 140 */ 141 .matches = { 142 DMI_MATCH(DMI_SYS_VENDOR, "Razer"), 143 DMI_MATCH(DMI_PRODUCT_NAME, "Blade Pro 17 (Early 2020) - RZ09-0329"), 144 }, 145 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 146 }, 147 { 148 /* 149 * Razer Blade Stealth 13 early 2020, when the lid is opened 150 * while suspended the open notification is lost and _LID keeps 151 * returning closed after resume, causing spurious re-suspends. 152 */ 153 .matches = { 154 DMI_MATCH(DMI_SYS_VENDOR, "Razer"), 155 DMI_MATCH(DMI_PRODUCT_NAME, "Blade Stealth 13 (Early 2020) - RZ09-0310"), 156 }, 157 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 158 }, 159 { 160 /* 161 * Samsung galaxybook2 ,initial _LID device notification returns 162 * lid closed. 163 */ 164 .matches = { 165 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 166 DMI_MATCH(DMI_PRODUCT_NAME, "750XED"), 167 }, 168 .driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_OPEN, 169 }, 170 {} 171 }; 172 173 static int acpi_button_probe(struct platform_device *pdev); 174 static void acpi_button_remove(struct platform_device *pdev); 175 176 #ifdef CONFIG_PM_SLEEP 177 static int acpi_button_suspend(struct device *dev); 178 static int acpi_button_resume(struct device *dev); 179 #else 180 #define acpi_button_suspend NULL 181 #define acpi_button_resume NULL 182 #endif 183 static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume); 184 185 static struct platform_driver acpi_button_driver = { 186 .probe = acpi_button_probe, 187 .remove = acpi_button_remove, 188 .driver = { 189 .name = "acpi-button", 190 .acpi_match_table = button_device_ids, 191 .pm = &acpi_button_pm, 192 }, 193 }; 194 195 struct acpi_button { 196 struct acpi_device *adev; 197 struct device *dev; /* physical button device */ 198 unsigned int type; 199 struct input_dev *input; 200 const char *class; /* for netlink messages */ 201 char phys[32]; /* for input device */ 202 unsigned long pushed; 203 bool last_state; 204 ktime_t last_time; 205 bool suspended; 206 bool lid_state_initialized; 207 bool gpe_enabled; 208 }; 209 210 static long lid_init_state = -1; 211 212 static unsigned long lid_report_interval __read_mostly = 500; 213 module_param(lid_report_interval, ulong, 0644); 214 MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events"); 215 216 /* FS Interface (/proc) */ 217 static struct proc_dir_entry *acpi_button_dir; 218 static struct proc_dir_entry *acpi_lid_dir; 219 220 static int acpi_lid_evaluate_state(acpi_handle lid_handle) 221 { 222 unsigned long long lid_state; 223 acpi_status status; 224 225 status = acpi_evaluate_integer(lid_handle, "_LID", NULL, &lid_state); 226 if (ACPI_FAILURE(status)) 227 return -ENODEV; 228 229 return !!lid_state; 230 } 231 232 static void acpi_lid_notify_state(struct acpi_button *button, bool state) 233 { 234 struct acpi_device *device = button->adev; 235 ktime_t next_report; 236 bool do_update; 237 238 /* 239 * In lid_init_state=ignore mode, if user opens/closes lid 240 * frequently with "open" missing, and "last_time" is also updated 241 * frequently, "close" cannot be delivered to the userspace. 242 * So "last_time" is only updated after a timeout or an actual 243 * switch. 244 */ 245 do_update = lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE || 246 button->last_state != state; 247 next_report = ktime_add(button->last_time, 248 ms_to_ktime(lid_report_interval)); 249 if (button->last_state == state && 250 ktime_after(ktime_get(), next_report)) { 251 /* Complain about the buggy firmware. */ 252 pr_warn_once(FW_BUG "Unexpected lid state reported by firmware\n"); 253 254 /* 255 * Send the unreliable complement switch event: 256 * 257 * On most platforms, the lid device is reliable. However 258 * there are exceptions: 259 * 1. Platforms returning initial lid state as "close" by 260 * default after booting/resuming: 261 * https://bugzilla.kernel.org/show_bug.cgi?id=89211 262 * https://bugzilla.kernel.org/show_bug.cgi?id=106151 263 * 2. Platforms never reporting "open" events: 264 * https://bugzilla.kernel.org/show_bug.cgi?id=106941 265 * On these buggy platforms, the usage model of the ACPI 266 * lid device actually is: 267 * 1. The initial returning value of _LID may not be 268 * reliable. 269 * 2. The open event may not be reliable. 270 * 3. The close event is reliable. 271 * 272 * But SW_LID is typed as input switch event, the input 273 * layer checks if the event is redundant. Hence if the 274 * state is not switched, the userspace cannot see this 275 * platform triggered reliable event. By inserting a 276 * complement switch event, it then is guaranteed that the 277 * platform triggered reliable one can always be seen by 278 * the userspace. 279 */ 280 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) { 281 do_update = true; 282 /* 283 * Do generate complement switch event for "close" 284 * as "close" is reliable and wrong "open" won't 285 * trigger unexpected behaviors. 286 * Do not generate complement switch event for 287 * "open" as "open" is not reliable and wrong 288 * "close" will trigger unexpected behaviors. 289 */ 290 if (!state) { 291 input_report_switch(button->input, 292 SW_LID, state); 293 input_sync(button->input); 294 } 295 } 296 } 297 /* Send the platform triggered reliable event */ 298 if (do_update) { 299 acpi_handle_debug(device->handle, "ACPI LID %s\n", 300 state ? "open" : "closed"); 301 input_report_switch(button->input, SW_LID, !state); 302 input_sync(button->input); 303 button->last_state = state; 304 button->last_time = ktime_get(); 305 } 306 } 307 308 static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq, 309 void *offset) 310 { 311 struct acpi_button *button = seq->private; 312 int state; 313 314 state = acpi_lid_evaluate_state(button->adev->handle); 315 seq_printf(seq, "state: %s\n", 316 state < 0 ? "unsupported" : (state ? "open" : "closed")); 317 return 0; 318 } 319 320 static int acpi_lid_add_fs(struct acpi_button *button) 321 { 322 struct acpi_device *device = button->adev; 323 struct proc_dir_entry *entry = NULL; 324 325 if (acpi_button_dir || acpi_lid_dir) { 326 pr_info("More than one Lid device found!\n"); 327 return -EEXIST; 328 } 329 330 /* create /proc/acpi/button */ 331 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); 332 if (!acpi_button_dir) 333 return -ENODEV; 334 335 /* create /proc/acpi/button/lid */ 336 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 337 if (!acpi_lid_dir) 338 goto remove_button_dir; 339 340 /* create /proc/acpi/button/lid/LID/ */ 341 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir); 342 if (!acpi_device_dir(device)) 343 goto remove_lid_dir; 344 345 /* create /proc/acpi/button/lid/LID/state */ 346 entry = proc_create_single_data(ACPI_BUTTON_FILE_STATE, S_IRUGO, 347 acpi_device_dir(device), acpi_button_state_seq_show, 348 button); 349 if (!entry) 350 goto remove_dev_dir; 351 352 return 0; 353 354 remove_dev_dir: 355 remove_proc_entry(acpi_device_bid(device), acpi_lid_dir); 356 acpi_device_dir(device) = NULL; 357 remove_lid_dir: 358 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 359 acpi_lid_dir = NULL; 360 remove_button_dir: 361 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 362 acpi_button_dir = NULL; 363 return -ENODEV; 364 } 365 366 static void acpi_lid_remove_fs(void *data) 367 { 368 struct acpi_button *button = data; 369 struct acpi_device *device = button->adev; 370 371 remove_proc_entry(ACPI_BUTTON_FILE_STATE, 372 acpi_device_dir(device)); 373 remove_proc_entry(acpi_device_bid(device), 374 acpi_lid_dir); 375 acpi_device_dir(device) = NULL; 376 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); 377 acpi_lid_dir = NULL; 378 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); 379 acpi_button_dir = NULL; 380 } 381 382 static int devm_acpi_lid_add_fs(struct device *dev, struct acpi_button *button) 383 { 384 int ret; 385 386 ret = acpi_lid_add_fs(button); 387 if (ret) 388 return ret; 389 390 return devm_add_action_or_reset(dev, acpi_lid_remove_fs, button); 391 } 392 393 static acpi_handle saved_lid_handle; 394 static DEFINE_MUTEX(acpi_lid_lock); 395 396 static void acpi_lid_save(struct acpi_device *adev) 397 { 398 guard(mutex)(&acpi_lid_lock); 399 400 saved_lid_handle = adev->handle; 401 } 402 403 static void acpi_lid_forget(struct acpi_device *adev) 404 { 405 guard(mutex)(&acpi_lid_lock); 406 407 if (saved_lid_handle == adev->handle) 408 saved_lid_handle = NULL; 409 } 410 411 /* Driver Interface */ 412 int acpi_lid_open(void) 413 { 414 guard(mutex)(&acpi_lid_lock); 415 416 if (!saved_lid_handle) 417 return -ENODEV; 418 419 return acpi_lid_evaluate_state(saved_lid_handle); 420 } 421 EXPORT_SYMBOL(acpi_lid_open); 422 423 static void acpi_lid_update_state(struct acpi_button *button, bool signal_wakeup) 424 { 425 int state; 426 427 state = acpi_lid_evaluate_state(button->adev->handle); 428 if (state < 0) 429 return; 430 431 if (state && signal_wakeup) 432 acpi_pm_wakeup_event(button->dev); 433 434 acpi_lid_notify_state(button, state); 435 } 436 437 static void acpi_lid_initialize_state(struct acpi_button *button) 438 { 439 switch (lid_init_state) { 440 case ACPI_BUTTON_LID_INIT_OPEN: 441 acpi_lid_notify_state(button, true); 442 break; 443 case ACPI_BUTTON_LID_INIT_METHOD: 444 acpi_lid_update_state(button, false); 445 break; 446 case ACPI_BUTTON_LID_INIT_IGNORE: 447 default: 448 break; 449 } 450 451 button->lid_state_initialized = true; 452 } 453 454 static void acpi_lid_notify(acpi_handle handle, u32 event, void *data) 455 { 456 struct acpi_button *button = data; 457 struct acpi_device *device = button->adev; 458 459 if (event != ACPI_BUTTON_NOTIFY_STATUS) { 460 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 461 event); 462 return; 463 } 464 465 if (!button->lid_state_initialized) 466 return; 467 468 acpi_lid_update_state(button, true); 469 } 470 471 static void acpi_button_notify(acpi_handle handle, u32 event, void *data) 472 { 473 struct acpi_button *button = data; 474 struct acpi_device *device = button->adev; 475 struct input_dev *input; 476 int keycode; 477 478 switch (event) { 479 case ACPI_BUTTON_NOTIFY_STATUS: 480 break; 481 case ACPI_BUTTON_NOTIFY_WAKE: 482 break; 483 default: 484 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 485 event); 486 return; 487 } 488 489 acpi_pm_wakeup_event(button->dev); 490 491 if (button->suspended || event == ACPI_BUTTON_NOTIFY_WAKE) 492 return; 493 494 input = button->input; 495 keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER; 496 497 input_report_key(input, keycode, 1); 498 input_sync(input); 499 input_report_key(input, keycode, 0); 500 input_sync(input); 501 502 acpi_bus_generate_netlink_event(button->class, dev_name(&device->dev), 503 event, ++button->pushed); 504 } 505 506 static void acpi_button_notify_run(void *data) 507 { 508 acpi_button_notify(NULL, ACPI_BUTTON_NOTIFY_STATUS, data); 509 } 510 511 static u32 acpi_button_event(void *data) 512 { 513 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_button_notify_run, data); 514 return ACPI_INTERRUPT_HANDLED; 515 } 516 517 #ifdef CONFIG_PM_SLEEP 518 static int acpi_button_suspend(struct device *dev) 519 { 520 struct acpi_button *button = dev_get_drvdata(dev); 521 522 button->suspended = true; 523 return 0; 524 } 525 526 static int acpi_button_resume(struct device *dev) 527 { 528 struct acpi_button *button = dev_get_drvdata(dev); 529 struct input_dev *input; 530 531 button->suspended = false; 532 if (button->type == ACPI_BUTTON_TYPE_LID) { 533 button->last_state = !!acpi_lid_evaluate_state(ACPI_HANDLE(dev)); 534 button->last_time = ktime_get(); 535 acpi_lid_initialize_state(button); 536 } 537 538 if (button->type == ACPI_BUTTON_TYPE_POWER) { 539 input = button->input; 540 input_report_key(input, KEY_WAKEUP, 1); 541 input_sync(input); 542 input_report_key(input, KEY_WAKEUP, 0); 543 input_sync(input); 544 } 545 return 0; 546 } 547 #endif 548 549 static int acpi_lid_input_open(struct input_dev *input) 550 { 551 struct acpi_button *button = input_get_drvdata(input); 552 553 button->last_state = !!acpi_lid_evaluate_state(button->adev->handle); 554 button->last_time = ktime_get(); 555 acpi_lid_initialize_state(button); 556 557 return 0; 558 } 559 560 static acpi_notify_handler acpi_button_notify_handler(struct acpi_button *button) 561 { 562 if (button->type == ACPI_BUTTON_TYPE_LID) 563 return acpi_lid_notify; 564 565 return acpi_button_notify; 566 } 567 568 static void acpi_button_wakeup_cleanup(void *data) 569 { 570 device_init_wakeup(data, false); 571 } 572 573 static int devm_acpi_button_init_wakeup(struct device *dev) 574 { 575 device_init_wakeup(dev, true); 576 return devm_add_action_or_reset(dev, acpi_button_wakeup_cleanup, dev); 577 } 578 579 static void acpi_button_remove_event_handler(void *data) 580 { 581 struct acpi_button *button = data; 582 struct acpi_device *adev = button->adev; 583 584 switch (adev->device_type) { 585 case ACPI_BUS_TYPE_POWER_BUTTON: 586 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 587 acpi_button_event); 588 break; 589 590 case ACPI_BUS_TYPE_SLEEP_BUTTON: 591 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 592 acpi_button_event); 593 break; 594 595 default: 596 if (button->gpe_enabled) { 597 dev_dbg(button->dev, "Disabling ACPI GPE%02llx\n", 598 adev->wakeup.gpe_number); 599 acpi_disable_gpe(adev->wakeup.gpe_device, 600 adev->wakeup.gpe_number); 601 } 602 acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY, 603 acpi_button_notify_handler(button)); 604 break; 605 } 606 acpi_os_wait_events_complete(); 607 } 608 609 static int acpi_button_add_fixed_event_handler(u32 event, 610 struct acpi_button *button) 611 { 612 acpi_status status; 613 614 status = acpi_install_fixed_event_handler(event, acpi_button_event, button); 615 if (ACPI_FAILURE(status)) 616 return -ENODEV; 617 618 return 0; 619 } 620 621 static int acpi_button_add_event_handler(struct acpi_button *button) 622 { 623 struct acpi_device *adev = button->adev; 624 acpi_status status; 625 626 if (adev->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 627 return acpi_button_add_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 628 button); 629 630 if (adev->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 631 return acpi_button_add_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 632 button); 633 634 status = acpi_install_notify_handler(adev->handle, ACPI_ALL_NOTIFY, 635 acpi_button_notify_handler(button), 636 button); 637 if (ACPI_FAILURE(status)) 638 return -ENODEV; 639 640 if (!adev->wakeup.flags.valid) 641 return 0; 642 643 /* 644 * If the wakeup GPE has a handler method, enable it in case it is also 645 * used for signaling runtime events. 646 */ 647 status = acpi_enable_gpe_cond(adev->wakeup.gpe_device, 648 adev->wakeup.gpe_number, 649 ACPI_GPE_DISPATCH_METHOD); 650 button->gpe_enabled = ACPI_SUCCESS(status); 651 if (button->gpe_enabled) 652 dev_dbg(button->dev, "Enabled ACPI GPE%02llx\n", 653 adev->wakeup.gpe_number); 654 655 return 0; 656 } 657 658 static int devm_acpi_button_add_event_handler(struct device *dev, 659 struct acpi_button *button) 660 { 661 int ret; 662 663 ret = acpi_button_add_event_handler(button); 664 if (ret) 665 return ret; 666 667 return devm_add_action_or_reset(dev, acpi_button_remove_event_handler, 668 button); 669 } 670 671 static int acpi_button_probe(struct platform_device *pdev) 672 { 673 struct device *dev = &pdev->dev; 674 struct acpi_device *device = ACPI_COMPANION(dev); 675 const struct acpi_device_id *id; 676 struct acpi_button *button; 677 struct input_dev *input; 678 u8 button_type; 679 int error = 0; 680 681 id = acpi_match_acpi_device(button_device_ids, device); 682 if (!id || strcmp(acpi_device_hid(device), id->id)) 683 return dev_err_probe(dev, -ENODEV, "Unsupported device\n"); 684 685 button_type = id->driver_data; 686 if (button_type == ACPI_BUTTON_TYPE_LID && 687 lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED) 688 return -ENODEV; 689 690 button = devm_kzalloc(dev, sizeof(*button), GFP_KERNEL); 691 if (!button) 692 return -ENOMEM; 693 694 platform_set_drvdata(pdev, button); 695 696 button->dev = dev; 697 button->adev = device; 698 input = devm_input_allocate_device(dev); 699 if (!input) 700 return -ENOMEM; 701 702 button->input = input; 703 button->type = button_type; 704 705 switch (button_type) { 706 case ACPI_BUTTON_TYPE_LID: 707 button->class = ACPI_BUTTON_CLASS_LID; 708 709 input->name = ACPI_BUTTON_DEVICE_NAME_LID; 710 input_set_capability(input, EV_SW, SW_LID); 711 input->open = acpi_lid_input_open; 712 713 error = devm_acpi_lid_add_fs(dev, button); 714 if (error) 715 return error; 716 717 break; 718 719 case ACPI_BUTTON_TYPE_POWER: 720 button->class = ACPI_BUTTON_CLASS_POWER; 721 722 input->name = ACPI_BUTTON_DEVICE_NAME_POWER; 723 input_set_capability(input, EV_KEY, KEY_POWER); 724 input_set_capability(input, EV_KEY, KEY_WAKEUP); 725 break; 726 727 case ACPI_BUTTON_TYPE_SLEEP: 728 button->class = ACPI_BUTTON_CLASS_SLEEP; 729 730 input->name = ACPI_BUTTON_DEVICE_NAME_SLEEP; 731 input_set_capability(input, EV_KEY, KEY_SLEEP); 732 break; 733 734 default: 735 return dev_err_probe(dev, -ENODEV, "Unrecognized button type\n"); 736 } 737 738 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", 739 acpi_device_hid(device)); 740 741 input->phys = button->phys; 742 input->id.bustype = BUS_HOST; 743 input->id.product = button_type; 744 745 input_set_drvdata(input, button); 746 error = input_register_device(input); 747 if (error) 748 return error; 749 750 error = devm_acpi_button_init_wakeup(dev); 751 if (error) 752 return error; 753 754 error = devm_acpi_button_add_event_handler(dev, button); 755 if (error) 756 return error; 757 758 if (button_type == ACPI_BUTTON_TYPE_LID) { 759 /* 760 * This assumes there's only one lid device, or if there are 761 * more we only care about the last one... 762 */ 763 acpi_lid_save(device); 764 } 765 766 pr_info("%s [%s]\n", input->name, acpi_device_bid(device)); 767 768 return 0; 769 } 770 771 static void acpi_button_remove(struct platform_device *pdev) 772 { 773 struct acpi_button *button = platform_get_drvdata(pdev); 774 775 if (button->type == ACPI_BUTTON_TYPE_LID) 776 acpi_lid_forget(button->adev); 777 } 778 779 static int param_set_lid_init_state(const char *val, 780 const struct kernel_param *kp) 781 { 782 int i; 783 784 i = sysfs_match_string(lid_init_state_str, val); 785 if (i < 0) 786 return i; 787 788 lid_init_state = i; 789 pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]); 790 return 0; 791 } 792 793 static int param_get_lid_init_state(char *buf, const struct kernel_param *kp) 794 { 795 int i, c = 0; 796 797 for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++) 798 if (i == lid_init_state) 799 c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]); 800 else 801 c += sprintf(buf + c, "%s ", lid_init_state_str[i]); 802 803 buf[c - 1] = '\n'; /* Replace the final space with a newline */ 804 805 return c; 806 } 807 808 module_param_call(lid_init_state, 809 param_set_lid_init_state, param_get_lid_init_state, 810 NULL, 0644); 811 MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state"); 812 813 static int __init acpi_button_init(void) 814 { 815 const struct dmi_system_id *dmi_id; 816 817 if (lid_init_state == -1) { 818 dmi_id = dmi_first_match(dmi_lid_quirks); 819 if (dmi_id) 820 lid_init_state = (long)dmi_id->driver_data; 821 else 822 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD; 823 } 824 825 /* 826 * Modules such as nouveau.ko and i915.ko have a link time dependency 827 * on acpi_lid_open(), and would therefore not be loadable on ACPI 828 * capable kernels booted in non-ACPI mode if the return value of 829 * platform_driver_register() is returned from here with ACPI disabled 830 * when this driver is built as a module. 831 */ 832 if (acpi_disabled) 833 return 0; 834 835 return platform_driver_register(&acpi_button_driver); 836 } 837 838 static void __exit acpi_button_exit(void) 839 { 840 if (!acpi_disabled) 841 platform_driver_unregister(&acpi_button_driver); 842 } 843 844 module_init(acpi_button_init); 845 module_exit(acpi_button_exit); 846