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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 | // SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_utils.c - ACPI Utility Functions ($Revision: 10 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/types.h> #include <linux/hardirq.h> #include <linux/acpi.h> #include <linux/dynamic_debug.h> #include "internal.h" #include "sleep.h" #define _COMPONENT ACPI_BUS_COMPONENT ACPI_MODULE_NAME("utils"); /* -------------------------------------------------------------------------- Object Evaluation Helpers -------------------------------------------------------------------------- */ static void acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s) { #ifdef ACPI_DEBUG_OUTPUT char prefix[80] = {'\0'}; struct acpi_buffer buffer = {sizeof(prefix), prefix}; acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n", (char *) prefix, p, acpi_format_exception(s))); #else return; #endif } acpi_status acpi_extract_package(union acpi_object *package, struct acpi_buffer *format, struct acpi_buffer *buffer) { u32 size_required = 0; u32 tail_offset = 0; char *format_string = NULL; u32 format_count = 0; u32 i = 0; u8 *head = NULL; u8 *tail = NULL; if (!package || (package->type != ACPI_TYPE_PACKAGE) || (package->package.count < 1)) { printk(KERN_WARNING PREFIX "Invalid package argument\n"); return AE_BAD_PARAMETER; } if (!format || !format->pointer || (format->length < 1)) { printk(KERN_WARNING PREFIX "Invalid format argument\n"); return AE_BAD_PARAMETER; } if (!buffer) { printk(KERN_WARNING PREFIX "Invalid buffer argument\n"); return AE_BAD_PARAMETER; } format_count = (format->length / sizeof(char)) - 1; if (format_count > package->package.count) { printk(KERN_WARNING PREFIX "Format specifies more objects [%d]" " than exist in package [%d].\n", format_count, package->package.count); return AE_BAD_DATA; } format_string = format->pointer; /* * Calculate size_required. */ for (i = 0; i < format_count; i++) { union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': size_required += sizeof(u64); tail_offset += sizeof(u64); break; case 'S': size_required += sizeof(char *) + sizeof(u64) + sizeof(char); tail_offset += sizeof(char *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d]: got number, expecting" " [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': size_required += sizeof(char *) + (element->string.length * sizeof(char)) + sizeof(char); tail_offset += sizeof(char *); break; case 'B': size_required += sizeof(u8 *) + element->buffer.length; tail_offset += sizeof(u8 *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d] got string/buffer," " expecting [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': size_required += sizeof(void *); tail_offset += sizeof(void *); break; default: printk(KERN_WARNING PREFIX "Invalid package element" " [%d] got reference," " expecting [%c]\n", i, format_string[i]); return AE_BAD_DATA; } break; case ACPI_TYPE_PACKAGE: default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unsupported element at index=%d\n", i)); /* TBD: handle nested packages... */ return AE_SUPPORT; } } /* * Validate output buffer. */ if (buffer->length == ACPI_ALLOCATE_BUFFER) { buffer->pointer = ACPI_ALLOCATE_ZEROED(size_required); if (!buffer->pointer) return AE_NO_MEMORY; buffer->length = size_required; } else { if (buffer->length < size_required) { buffer->length = size_required; return AE_BUFFER_OVERFLOW; } else if (buffer->length != size_required || !buffer->pointer) { return AE_BAD_PARAMETER; } } head = buffer->pointer; tail = buffer->pointer + tail_offset; /* * Extract package data. */ for (i = 0; i < format_count; i++) { u8 **pointer = NULL; union acpi_object *element = &(package->package.elements[i]); switch (element->type) { case ACPI_TYPE_INTEGER: switch (format_string[i]) { case 'N': *((u64 *) head) = element->integer.value; head += sizeof(u64); break; case 'S': pointer = (u8 **) head; *pointer = tail; *((u64 *) tail) = element->integer.value; head += sizeof(u64 *); tail += sizeof(u64); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_STRING: case ACPI_TYPE_BUFFER: switch (format_string[i]) { case 'S': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->string.pointer, element->string.length); head += sizeof(char *); tail += element->string.length * sizeof(char); /* NULL terminate string */ *tail = (char)0; tail += sizeof(char); break; case 'B': pointer = (u8 **) head; *pointer = tail; memcpy(tail, element->buffer.pointer, element->buffer.length); head += sizeof(u8 *); tail += element->buffer.length; break; default: /* Should never get here */ break; } break; case ACPI_TYPE_LOCAL_REFERENCE: switch (format_string[i]) { case 'R': *(void **)head = (void *)element->reference.handle; head += sizeof(void *); break; default: /* Should never get here */ break; } break; case ACPI_TYPE_PACKAGE: /* TBD: handle nested packages... */ default: /* Should never get here */ break; } } return AE_OK; } EXPORT_SYMBOL(acpi_extract_package); acpi_status acpi_evaluate_integer(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, unsigned long long *data) { acpi_status status = AE_OK; union acpi_object element; struct acpi_buffer buffer = { 0, NULL }; if (!data) return AE_BAD_PARAMETER; buffer.length = sizeof(union acpi_object); buffer.pointer = &element; status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) { acpi_util_eval_error(handle, pathname, status); return status; } if (element.type != ACPI_TYPE_INTEGER) { acpi_util_eval_error(handle, pathname, AE_BAD_DATA); return AE_BAD_DATA; } *data = element.integer.value; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data)); return AE_OK; } EXPORT_SYMBOL(acpi_evaluate_integer); acpi_status acpi_evaluate_reference(acpi_handle handle, acpi_string pathname, struct acpi_object_list *arguments, struct acpi_handle_list *list) { acpi_status status = AE_OK; union acpi_object *package = NULL; union acpi_object *element = NULL; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; u32 i = 0; if (!list) { return AE_BAD_PARAMETER; } /* Evaluate object. */ status = acpi_evaluate_object(handle, pathname, arguments, &buffer); if (ACPI_FAILURE(status)) goto end; package = buffer.pointer; if ((buffer.length == 0) || !package) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->type != ACPI_TYPE_PACKAGE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (!package->package.count) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); goto end; } if (package->package.count > ACPI_MAX_HANDLES) { kfree(package); return AE_NO_MEMORY; } list->count = package->package.count; /* Extract package data. */ for (i = 0; i < list->count; i++) { element = &(package->package.elements[i]); if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { status = AE_BAD_DATA; acpi_util_eval_error(handle, pathname, status); break; } if (!element->reference.handle) { status = AE_NULL_ENTRY; acpi_util_eval_error(handle, pathname, status); break; } /* Get the acpi_handle. */ list->handles[i] = element->reference.handle; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n", list->handles[i])); } end: if (ACPI_FAILURE(status)) { list->count = 0; //kfree(list->handles); } kfree(buffer.pointer); return status; } EXPORT_SYMBOL(acpi_evaluate_reference); acpi_status acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *output; status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer); if (ACPI_FAILURE(status)) return status; output = buffer.pointer; if (!output || output->type != ACPI_TYPE_PACKAGE || !output->package.count || output->package.elements[0].type != ACPI_TYPE_BUFFER || output->package.elements[0].buffer.length < ACPI_PLD_REV1_BUFFER_SIZE) { status = AE_TYPE; goto out; } status = acpi_decode_pld_buffer( output->package.elements[0].buffer.pointer, output->package.elements[0].buffer.length, pld); out: kfree(buffer.pointer); return status; } EXPORT_SYMBOL(acpi_get_physical_device_location); /** * acpi_evaluate_ost: Evaluate _OST for hotplug operations * @handle: ACPI device handle * @source_event: source event code * @status_code: status code * @status_buf: optional detailed information (NULL if none) * * Evaluate _OST for hotplug operations. All ACPI hotplug handlers * must call this function when evaluating _OST for hotplug operations. * When the platform does not support _OST, this function has no effect. */ acpi_status acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code, struct acpi_buffer *status_buf) { union acpi_object params[3] = { {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_INTEGER,}, {.type = ACPI_TYPE_BUFFER,} }; struct acpi_object_list arg_list = {3, params}; params[0].integer.value = source_event; params[1].integer.value = status_code; if (status_buf != NULL) { params[2].buffer.pointer = status_buf->pointer; params[2].buffer.length = status_buf->length; } else { params[2].buffer.pointer = NULL; params[2].buffer.length = 0; } return acpi_evaluate_object(handle, "_OST", &arg_list, NULL); } EXPORT_SYMBOL(acpi_evaluate_ost); /** * acpi_handle_path: Return the object path of handle * @handle: ACPI device handle * * Caller must free the returned buffer */ static char *acpi_handle_path(acpi_handle handle) { struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, .pointer = NULL }; if (in_interrupt() || acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK) return NULL; return buffer.pointer; } /** * acpi_handle_printk: Print message with ACPI prefix and object path * @level: log level * @handle: ACPI device handle * @fmt: format string * * This function is called through acpi_handle_<level> macros and prints * a message with ACPI prefix and object path. This function acquires * the global namespace mutex to obtain an object path. In interrupt * context, it shows the object path as <n/a>. */ void acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...) { struct va_format vaf; va_list args; const char *path; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; path = acpi_handle_path(handle); printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf); va_end(args); kfree(path); } EXPORT_SYMBOL(acpi_handle_printk); #if defined(CONFIG_DYNAMIC_DEBUG) /** * __acpi_handle_debug: pr_debug with ACPI prefix and object path * @descriptor: Dynamic Debug descriptor * @handle: ACPI device handle * @fmt: format string * * This function is called through acpi_handle_debug macro and debug * prints a message with ACPI prefix and object path. This function * acquires the global namespace mutex to obtain an object path. In * interrupt context, it shows the object path as <n/a>. */ void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const char *fmt, ...) { struct va_format vaf; va_list args; const char *path; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; path = acpi_handle_path(handle); __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf); va_end(args); kfree(path); } EXPORT_SYMBOL(__acpi_handle_debug); #endif /** * acpi_has_method: Check whether @handle has a method named @name * @handle: ACPI device handle * @name: name of object or method * * Check whether @handle has a method named @name. */ bool acpi_has_method(acpi_handle handle, char *name) { acpi_handle tmp; return ACPI_SUCCESS(acpi_get_handle(handle, name, &tmp)); } EXPORT_SYMBOL(acpi_has_method); acpi_status acpi_execute_simple_method(acpi_handle handle, char *method, u64 arg) { union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { .count = 1, .pointer = &obj, }; obj.integer.value = arg; return acpi_evaluate_object(handle, method, &arg_list, NULL); } EXPORT_SYMBOL(acpi_execute_simple_method); /** * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations * @handle: ACPI device handle * * Evaluate device's _EJ0 method for hotplug operations. */ acpi_status acpi_evaluate_ej0(acpi_handle handle) { acpi_status status; status = acpi_execute_simple_method(handle, "_EJ0", 1); if (status == AE_NOT_FOUND) acpi_handle_warn(handle, "No _EJ0 support for device\n"); else if (ACPI_FAILURE(status)) acpi_handle_warn(handle, "Eject failed (0x%x)\n", status); return status; } /** * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device * @handle: ACPI device handle * @lock: lock device if non-zero, otherwise unlock device * * Evaluate device's _LCK method if present to lock/unlock device */ acpi_status acpi_evaluate_lck(acpi_handle handle, int lock) { acpi_status status; status = acpi_execute_simple_method(handle, "_LCK", !!lock); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { if (lock) acpi_handle_warn(handle, "Locking device failed (0x%x)\n", status); else acpi_handle_warn(handle, "Unlocking device failed (0x%x)\n", status); } return status; } /** * acpi_evaluate_reg: Evaluate _REG method to register OpRegion presence * @handle: ACPI device handle * @space_id: ACPI address space id to register OpRegion presence for * @function: Parameter to pass to _REG one of ACPI_REG_CONNECT or * ACPI_REG_DISCONNECT * * Evaluate device's _REG method to register OpRegion presence. */ acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function) { struct acpi_object_list arg_list; union acpi_object params[2]; params[0].type = ACPI_TYPE_INTEGER; params[0].integer.value = space_id; params[1].type = ACPI_TYPE_INTEGER; params[1].integer.value = function; arg_list.count = 2; arg_list.pointer = params; return acpi_evaluate_object(handle, "_REG", &arg_list, NULL); } EXPORT_SYMBOL(acpi_evaluate_reg); /** * acpi_evaluate_dsm - evaluate device's _DSM method * @handle: ACPI device handle * @guid: GUID of requested functions, should be 16 bytes * @rev: revision number of requested function * @func: requested function number * @argv4: the function specific parameter * * Evaluate device's _DSM method with specified GUID, revision id and * function number. Caller needs to free the returned object. * * Though ACPI defines the fourth parameter for _DSM should be a package, * some old BIOSes do expect a buffer or an integer etc. */ union acpi_object * acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 func, union acpi_object *argv4) { acpi_status ret; struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL}; union acpi_object params[4]; struct acpi_object_list input = { .count = 4, .pointer = params, }; params[0].type = ACPI_TYPE_BUFFER; params[0].buffer.length = 16; params[0].buffer.pointer = (u8 *)guid; params[1].type = ACPI_TYPE_INTEGER; params[1].integer.value = rev; params[2].type = ACPI_TYPE_INTEGER; params[2].integer.value = func; if (argv4) { params[3] = *argv4; } else { params[3].type = ACPI_TYPE_PACKAGE; params[3].package.count = 0; params[3].package.elements = NULL; } ret = acpi_evaluate_object(handle, "_DSM", &input, &buf); if (ACPI_SUCCESS(ret)) return (union acpi_object *)buf.pointer; if (ret != AE_NOT_FOUND) acpi_handle_warn(handle, "failed to evaluate _DSM (0x%x)\n", ret); return NULL; } EXPORT_SYMBOL(acpi_evaluate_dsm); /** * acpi_check_dsm - check if _DSM method supports requested functions. * @handle: ACPI device handle * @guid: GUID of requested functions, should be 16 bytes at least * @rev: revision number of requested functions * @funcs: bitmap of requested functions * * Evaluate device's _DSM method to check whether it supports requested * functions. Currently only support 64 functions at maximum, should be * enough for now. */ bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs) { int i; u64 mask = 0; union acpi_object *obj; if (funcs == 0) return false; obj = acpi_evaluate_dsm(handle, guid, rev, 0, NULL); if (!obj) return false; /* For compatibility, old BIOSes may return an integer */ if (obj->type == ACPI_TYPE_INTEGER) mask = obj->integer.value; else if (obj->type == ACPI_TYPE_BUFFER) for (i = 0; i < obj->buffer.length && i < 8; i++) mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); ACPI_FREE(obj); /* * Bit 0 indicates whether there's support for any functions other than * function 0 for the specified GUID and revision. */ if ((mask & 0x1) && (mask & funcs) == funcs) return true; return false; } EXPORT_SYMBOL(acpi_check_dsm); /** * acpi_dev_hid_uid_match - Match device by supplied HID and UID * @adev: ACPI device to match. * @hid2: Hardware ID of the device. * @uid2: Unique ID of the device, pass NULL to not check _UID. * * Matches HID and UID in @adev with given @hid2 and @uid2. * Returns true if matches. */ bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2) { const char *hid1 = acpi_device_hid(adev); const char *uid1 = acpi_device_uid(adev); if (strcmp(hid1, hid2)) return false; if (!uid2) return true; return uid1 && !strcmp(uid1, uid2); } EXPORT_SYMBOL(acpi_dev_hid_uid_match); /** * acpi_dev_found - Detect presence of a given ACPI device in the namespace. * @hid: Hardware ID of the device. * * Return %true if the device was present at the moment of invocation. * Note that if the device is pluggable, it may since have disappeared. * * For this function to work, acpi_bus_scan() must have been executed * which happens in the subsys_initcall() subsection. Hence, do not * call from a subsys_initcall() or earlier (use acpi_get_devices() * instead). Calling from module_init() is fine (which is synonymous * with device_initcall()). */ bool acpi_dev_found(const char *hid) { struct acpi_device_bus_id *acpi_device_bus_id; bool found = false; mutex_lock(&acpi_device_lock); list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) if (!strcmp(acpi_device_bus_id->bus_id, hid)) { found = true; break; } mutex_unlock(&acpi_device_lock); return found; } EXPORT_SYMBOL(acpi_dev_found); struct acpi_dev_match_info { struct acpi_device_id hid[2]; const char *uid; s64 hrv; }; static int acpi_dev_match_cb(struct device *dev, const void *data) { struct acpi_device *adev = to_acpi_device(dev); const struct acpi_dev_match_info *match = data; unsigned long long hrv; acpi_status status; if (acpi_match_device_ids(adev, match->hid)) return 0; if (match->uid && (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, match->uid))) return 0; if (match->hrv == -1) return 1; status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv); if (ACPI_FAILURE(status)) return 0; return hrv == match->hrv; } /** * acpi_dev_present - Detect that a given ACPI device is present * @hid: Hardware ID of the device. * @uid: Unique ID of the device, pass NULL to not check _UID * @hrv: Hardware Revision of the device, pass -1 to not check _HRV * * Return %true if a matching device was present at the moment of invocation. * Note that if the device is pluggable, it may since have disappeared. * * Note that unlike acpi_dev_found() this function checks the status * of the device. So for devices which are present in the dsdt, but * which are disabled (their _STA callback returns 0) this function * will return false. * * For this function to work, acpi_bus_scan() must have been executed * which happens in the subsys_initcall() subsection. Hence, do not * call from a subsys_initcall() or earlier (use acpi_get_devices() * instead). Calling from module_init() is fine (which is synonymous * with device_initcall()). */ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv) { struct acpi_dev_match_info match = {}; struct device *dev; strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); match.uid = uid; match.hrv = hrv; dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); put_device(dev); return !!dev; } EXPORT_SYMBOL(acpi_dev_present); /** * acpi_dev_get_first_match_dev - Return the first match of ACPI device * @hid: Hardware ID of the device. * @uid: Unique ID of the device, pass NULL to not check _UID * @hrv: Hardware Revision of the device, pass -1 to not check _HRV * * Return the first match of ACPI device if a matching device was present * at the moment of invocation, or NULL otherwise. * * The caller is responsible to call put_device() on the returned device. * * See additional information in acpi_dev_present() as well. */ struct acpi_device * acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv) { struct acpi_dev_match_info match = {}; struct device *dev; strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id)); match.uid = uid; match.hrv = hrv; dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb); return dev ? to_acpi_device(dev) : NULL; } EXPORT_SYMBOL(acpi_dev_get_first_match_dev); /* * acpi_backlight= handling, this is done here rather then in video_detect.c * because __setup cannot be used in modules. */ char acpi_video_backlight_string[16]; EXPORT_SYMBOL(acpi_video_backlight_string); static int __init acpi_backlight(char *str) { strlcpy(acpi_video_backlight_string, str, sizeof(acpi_video_backlight_string)); return 1; } __setup("acpi_backlight=", acpi_backlight); /** * acpi_match_platform_list - Check if the system matches with a given list * @plat: pointer to acpi_platform_list table terminated by a NULL entry * * Return the matched index if the system is found in the platform list. * Otherwise, return a negative error code. */ int acpi_match_platform_list(const struct acpi_platform_list *plat) { struct acpi_table_header hdr; int idx = 0; if (acpi_disabled) return -ENODEV; for (; plat->oem_id[0]; plat++, idx++) { if (ACPI_FAILURE(acpi_get_table_header(plat->table, 0, &hdr))) continue; if (strncmp(plat->oem_id, hdr.oem_id, ACPI_OEM_ID_SIZE)) continue; if (strncmp(plat->oem_table_id, hdr.oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) continue; if ((plat->pred == all_versions) || (plat->pred == less_than_or_equal && hdr.oem_revision <= plat->oem_revision) || (plat->pred == greater_than_or_equal && hdr.oem_revision >= plat->oem_revision) || (plat->pred == equal && hdr.oem_revision == plat->oem_revision)) return idx; } return -ENODEV; } EXPORT_SYMBOL(acpi_match_platform_list); |