drivers/acpi/button.c

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