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