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