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