1 /****************************************************************************** 2 * 3 * Module Name: evregion - Operation Region support 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <acpi/acpi.h> 45 #include "accommon.h" 46 #include "acevents.h" 47 #include "acnamesp.h" 48 #include "acinterp.h" 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME("evregion") 52 53 extern u8 acpi_gbl_default_address_spaces[]; 54 55 /* Local prototypes */ 56 57 static void 58 acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node); 59 60 static acpi_status 61 acpi_ev_reg_run(acpi_handle obj_handle, 62 u32 level, void *context, void **return_value); 63 64 /******************************************************************************* 65 * 66 * FUNCTION: acpi_ev_initialize_op_regions 67 * 68 * PARAMETERS: None 69 * 70 * RETURN: Status 71 * 72 * DESCRIPTION: Execute _REG methods for all Operation Regions that have 73 * an installed default region handler. 74 * 75 ******************************************************************************/ 76 77 acpi_status acpi_ev_initialize_op_regions(void) 78 { 79 acpi_status status; 80 u32 i; 81 82 ACPI_FUNCTION_TRACE(ev_initialize_op_regions); 83 84 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 85 if (ACPI_FAILURE(status)) { 86 return_ACPI_STATUS(status); 87 } 88 89 /* Run the _REG methods for op_regions in each default address space */ 90 91 for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) { 92 /* 93 * Make sure the installed handler is the DEFAULT handler. If not the 94 * default, the _REG methods will have already been run (when the 95 * handler was installed) 96 */ 97 if (acpi_ev_has_default_handler(acpi_gbl_root_node, 98 acpi_gbl_default_address_spaces 99 [i])) { 100 status = 101 acpi_ev_execute_reg_methods(acpi_gbl_root_node, 102 acpi_gbl_default_address_spaces 103 [i]); 104 } 105 } 106 107 acpi_gbl_reg_methods_executed = TRUE; 108 109 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 110 return_ACPI_STATUS(status); 111 } 112 113 /******************************************************************************* 114 * 115 * FUNCTION: acpi_ev_address_space_dispatch 116 * 117 * PARAMETERS: region_obj - Internal region object 118 * field_obj - Corresponding field. Can be NULL. 119 * function - Read or Write operation 120 * region_offset - Where in the region to read or write 121 * bit_width - Field width in bits (8, 16, 32, or 64) 122 * value - Pointer to in or out value, must be 123 * a full 64-bit integer 124 * 125 * RETURN: Status 126 * 127 * DESCRIPTION: Dispatch an address space or operation region access to 128 * a previously installed handler. 129 * 130 ******************************************************************************/ 131 132 acpi_status 133 acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj, 134 union acpi_operand_object *field_obj, 135 u32 function, 136 u32 region_offset, u32 bit_width, u64 *value) 137 { 138 acpi_status status; 139 acpi_adr_space_handler handler; 140 acpi_adr_space_setup region_setup; 141 union acpi_operand_object *handler_desc; 142 union acpi_operand_object *region_obj2; 143 void *region_context = NULL; 144 struct acpi_connection_info *context; 145 146 ACPI_FUNCTION_TRACE(ev_address_space_dispatch); 147 148 region_obj2 = acpi_ns_get_secondary_object(region_obj); 149 if (!region_obj2) { 150 return_ACPI_STATUS(AE_NOT_EXIST); 151 } 152 153 /* Ensure that there is a handler associated with this region */ 154 155 handler_desc = region_obj->region.handler; 156 if (!handler_desc) { 157 ACPI_ERROR((AE_INFO, 158 "No handler for Region [%4.4s] (%p) [%s]", 159 acpi_ut_get_node_name(region_obj->region.node), 160 region_obj, 161 acpi_ut_get_region_name(region_obj->region. 162 space_id))); 163 164 return_ACPI_STATUS(AE_NOT_EXIST); 165 } 166 167 context = handler_desc->address_space.context; 168 169 /* 170 * It may be the case that the region has never been initialized. 171 * Some types of regions require special init code 172 */ 173 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 174 175 /* This region has not been initialized yet, do it */ 176 177 region_setup = handler_desc->address_space.setup; 178 if (!region_setup) { 179 180 /* No initialization routine, exit with error */ 181 182 ACPI_ERROR((AE_INFO, 183 "No init routine for region(%p) [%s]", 184 region_obj, 185 acpi_ut_get_region_name(region_obj->region. 186 space_id))); 187 return_ACPI_STATUS(AE_NOT_EXIST); 188 } 189 190 /* 191 * We must exit the interpreter because the region setup will 192 * potentially execute control methods (for example, the _REG method 193 * for this region) 194 */ 195 acpi_ex_exit_interpreter(); 196 197 status = region_setup(region_obj, ACPI_REGION_ACTIVATE, 198 context, ®ion_context); 199 200 /* Re-enter the interpreter */ 201 202 acpi_ex_enter_interpreter(); 203 204 /* Check for failure of the Region Setup */ 205 206 if (ACPI_FAILURE(status)) { 207 ACPI_EXCEPTION((AE_INFO, status, 208 "During region initialization: [%s]", 209 acpi_ut_get_region_name(region_obj-> 210 region. 211 space_id))); 212 return_ACPI_STATUS(status); 213 } 214 215 /* Region initialization may have been completed by region_setup */ 216 217 if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) { 218 region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE; 219 220 /* 221 * Save the returned context for use in all accesses to 222 * the handler for this particular region 223 */ 224 if (!(region_obj2->extra.region_context)) { 225 region_obj2->extra.region_context = 226 region_context; 227 } 228 } 229 } 230 231 /* We have everything we need, we can invoke the address space handler */ 232 233 handler = handler_desc->address_space.handler; 234 235 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 236 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n", 237 ®ion_obj->region.handler->address_space, handler, 238 ACPI_FORMAT_NATIVE_UINT(region_obj->region.address + 239 region_offset), 240 acpi_ut_get_region_name(region_obj->region. 241 space_id))); 242 243 /* 244 * Special handling for generic_serial_bus and general_purpose_io: 245 * There are three extra parameters that must be passed to the 246 * handler via the context: 247 * 1) Connection buffer, a resource template from Connection() op. 248 * 2) Length of the above buffer. 249 * 3) Actual access length from the access_as() op. 250 */ 251 if (((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) || 252 (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO)) && 253 context && field_obj) { 254 255 /* Get the Connection (resource_template) buffer */ 256 257 context->connection = field_obj->field.resource_buffer; 258 context->length = field_obj->field.resource_length; 259 context->access_length = field_obj->field.access_length; 260 } 261 262 if (!(handler_desc->address_space.handler_flags & 263 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 264 /* 265 * For handlers other than the default (supplied) handlers, we must 266 * exit the interpreter because the handler *might* block -- we don't 267 * know what it will do, so we can't hold the lock on the intepreter. 268 */ 269 acpi_ex_exit_interpreter(); 270 } 271 272 /* Call the handler */ 273 274 status = handler(function, 275 (region_obj->region.address + region_offset), 276 bit_width, value, context, 277 region_obj2->extra.region_context); 278 279 if (ACPI_FAILURE(status)) { 280 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", 281 acpi_ut_get_region_name(region_obj->region. 282 space_id))); 283 } 284 285 if (!(handler_desc->address_space.handler_flags & 286 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 287 /* 288 * We just returned from a non-default handler, we must re-enter the 289 * interpreter 290 */ 291 acpi_ex_enter_interpreter(); 292 } 293 294 return_ACPI_STATUS(status); 295 } 296 297 /******************************************************************************* 298 * 299 * FUNCTION: acpi_ev_detach_region 300 * 301 * PARAMETERS: region_obj - Region Object 302 * acpi_ns_is_locked - Namespace Region Already Locked? 303 * 304 * RETURN: None 305 * 306 * DESCRIPTION: Break the association between the handler and the region 307 * this is a two way association. 308 * 309 ******************************************************************************/ 310 311 void 312 acpi_ev_detach_region(union acpi_operand_object *region_obj, 313 u8 acpi_ns_is_locked) 314 { 315 union acpi_operand_object *handler_obj; 316 union acpi_operand_object *obj_desc; 317 union acpi_operand_object **last_obj_ptr; 318 acpi_adr_space_setup region_setup; 319 void **region_context; 320 union acpi_operand_object *region_obj2; 321 acpi_status status; 322 323 ACPI_FUNCTION_TRACE(ev_detach_region); 324 325 region_obj2 = acpi_ns_get_secondary_object(region_obj); 326 if (!region_obj2) { 327 return_VOID; 328 } 329 region_context = ®ion_obj2->extra.region_context; 330 331 /* Get the address handler from the region object */ 332 333 handler_obj = region_obj->region.handler; 334 if (!handler_obj) { 335 336 /* This region has no handler, all done */ 337 338 return_VOID; 339 } 340 341 /* Find this region in the handler's list */ 342 343 obj_desc = handler_obj->address_space.region_list; 344 last_obj_ptr = &handler_obj->address_space.region_list; 345 346 while (obj_desc) { 347 348 /* Is this the correct Region? */ 349 350 if (obj_desc == region_obj) { 351 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 352 "Removing Region %p from address handler %p\n", 353 region_obj, handler_obj)); 354 355 /* This is it, remove it from the handler's list */ 356 357 *last_obj_ptr = obj_desc->region.next; 358 obj_desc->region.next = NULL; /* Must clear field */ 359 360 if (acpi_ns_is_locked) { 361 status = 362 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 363 if (ACPI_FAILURE(status)) { 364 return_VOID; 365 } 366 } 367 368 /* Now stop region accesses by executing the _REG method */ 369 370 status = 371 acpi_ev_execute_reg_method(region_obj, 372 ACPI_REG_DISCONNECT); 373 if (ACPI_FAILURE(status)) { 374 ACPI_EXCEPTION((AE_INFO, status, 375 "from region _REG, [%s]", 376 acpi_ut_get_region_name 377 (region_obj->region.space_id))); 378 } 379 380 if (acpi_ns_is_locked) { 381 status = 382 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 383 if (ACPI_FAILURE(status)) { 384 return_VOID; 385 } 386 } 387 388 /* 389 * If the region has been activated, call the setup handler with 390 * the deactivate notification 391 */ 392 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 393 region_setup = handler_obj->address_space.setup; 394 status = 395 region_setup(region_obj, 396 ACPI_REGION_DEACTIVATE, 397 handler_obj->address_space. 398 context, region_context); 399 400 /* 401 * region_context should have been released by the deactivate 402 * operation. We don't need access to it anymore here. 403 */ 404 if (region_context) { 405 *region_context = NULL; 406 } 407 408 /* Init routine may fail, Just ignore errors */ 409 410 if (ACPI_FAILURE(status)) { 411 ACPI_EXCEPTION((AE_INFO, status, 412 "from region handler - deactivate, [%s]", 413 acpi_ut_get_region_name 414 (region_obj->region. 415 space_id))); 416 } 417 418 region_obj->region.flags &= 419 ~(AOPOBJ_SETUP_COMPLETE); 420 } 421 422 /* 423 * Remove handler reference in the region 424 * 425 * NOTE: this doesn't mean that the region goes away, the region 426 * is just inaccessible as indicated to the _REG method 427 * 428 * If the region is on the handler's list, this must be the 429 * region's handler 430 */ 431 region_obj->region.handler = NULL; 432 acpi_ut_remove_reference(handler_obj); 433 434 return_VOID; 435 } 436 437 /* Walk the linked list of handlers */ 438 439 last_obj_ptr = &obj_desc->region.next; 440 obj_desc = obj_desc->region.next; 441 } 442 443 /* If we get here, the region was not in the handler's region list */ 444 445 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 446 "Cannot remove region %p from address handler %p\n", 447 region_obj, handler_obj)); 448 449 return_VOID; 450 } 451 452 /******************************************************************************* 453 * 454 * FUNCTION: acpi_ev_attach_region 455 * 456 * PARAMETERS: handler_obj - Handler Object 457 * region_obj - Region Object 458 * acpi_ns_is_locked - Namespace Region Already Locked? 459 * 460 * RETURN: None 461 * 462 * DESCRIPTION: Create the association between the handler and the region 463 * this is a two way association. 464 * 465 ******************************************************************************/ 466 467 acpi_status 468 acpi_ev_attach_region(union acpi_operand_object *handler_obj, 469 union acpi_operand_object *region_obj, 470 u8 acpi_ns_is_locked) 471 { 472 473 ACPI_FUNCTION_TRACE(ev_attach_region); 474 475 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 476 "Adding Region [%4.4s] %p to address handler %p [%s]\n", 477 acpi_ut_get_node_name(region_obj->region.node), 478 region_obj, handler_obj, 479 acpi_ut_get_region_name(region_obj->region. 480 space_id))); 481 482 /* Link this region to the front of the handler's list */ 483 484 region_obj->region.next = handler_obj->address_space.region_list; 485 handler_obj->address_space.region_list = region_obj; 486 487 /* Install the region's handler */ 488 489 if (region_obj->region.handler) { 490 return_ACPI_STATUS(AE_ALREADY_EXISTS); 491 } 492 493 region_obj->region.handler = handler_obj; 494 acpi_ut_add_reference(handler_obj); 495 496 return_ACPI_STATUS(AE_OK); 497 } 498 499 /******************************************************************************* 500 * 501 * FUNCTION: acpi_ev_execute_reg_method 502 * 503 * PARAMETERS: region_obj - Region object 504 * function - Passed to _REG: On (1) or Off (0) 505 * 506 * RETURN: Status 507 * 508 * DESCRIPTION: Execute _REG method for a region 509 * 510 ******************************************************************************/ 511 512 acpi_status 513 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function) 514 { 515 struct acpi_evaluate_info *info; 516 union acpi_operand_object *args[3]; 517 union acpi_operand_object *region_obj2; 518 acpi_status status; 519 520 ACPI_FUNCTION_TRACE(ev_execute_reg_method); 521 522 region_obj2 = acpi_ns_get_secondary_object(region_obj); 523 if (!region_obj2) { 524 return_ACPI_STATUS(AE_NOT_EXIST); 525 } 526 527 if (region_obj2->extra.method_REG == NULL) { 528 return_ACPI_STATUS(AE_OK); 529 } 530 531 /* Allocate and initialize the evaluation information block */ 532 533 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 534 if (!info) { 535 return_ACPI_STATUS(AE_NO_MEMORY); 536 } 537 538 info->prefix_node = region_obj2->extra.method_REG; 539 info->relative_pathname = NULL; 540 info->parameters = args; 541 info->flags = ACPI_IGNORE_RETURN_VALUE; 542 543 /* 544 * The _REG method has two arguments: 545 * 546 * arg0 - Integer: 547 * Operation region space ID Same value as region_obj->Region.space_id 548 * 549 * arg1 - Integer: 550 * connection status 1 for connecting the handler, 0 for disconnecting 551 * the handler (Passed as a parameter) 552 */ 553 args[0] = 554 acpi_ut_create_integer_object((u64)region_obj->region.space_id); 555 if (!args[0]) { 556 status = AE_NO_MEMORY; 557 goto cleanup1; 558 } 559 560 args[1] = acpi_ut_create_integer_object((u64)function); 561 if (!args[1]) { 562 status = AE_NO_MEMORY; 563 goto cleanup2; 564 } 565 566 args[2] = NULL; /* Terminate list */ 567 568 /* Execute the method, no return value */ 569 570 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname 571 (ACPI_TYPE_METHOD, info->prefix_node, NULL)); 572 573 status = acpi_ns_evaluate(info); 574 acpi_ut_remove_reference(args[1]); 575 576 cleanup2: 577 acpi_ut_remove_reference(args[0]); 578 579 cleanup1: 580 ACPI_FREE(info); 581 return_ACPI_STATUS(status); 582 } 583 584 /******************************************************************************* 585 * 586 * FUNCTION: acpi_ev_execute_reg_methods 587 * 588 * PARAMETERS: node - Namespace node for the device 589 * space_id - The address space ID 590 * 591 * RETURN: Status 592 * 593 * DESCRIPTION: Run all _REG methods for the input Space ID; 594 * Note: assumes namespace is locked, or system init time. 595 * 596 ******************************************************************************/ 597 598 acpi_status 599 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, 600 acpi_adr_space_type space_id) 601 { 602 acpi_status status; 603 604 ACPI_FUNCTION_TRACE(ev_execute_reg_methods); 605 606 /* 607 * Run all _REG methods for all Operation Regions for this space ID. This 608 * is a separate walk in order to handle any interdependencies between 609 * regions and _REG methods. (i.e. handlers must be installed for all 610 * regions of this Space ID before we can run any _REG methods) 611 */ 612 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX, 613 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, 614 NULL, &space_id, NULL); 615 616 /* Special case for EC: handle "orphan" _REG methods with no region */ 617 618 if (space_id == ACPI_ADR_SPACE_EC) { 619 acpi_ev_orphan_ec_reg_method(node); 620 } 621 622 return_ACPI_STATUS(status); 623 } 624 625 /******************************************************************************* 626 * 627 * FUNCTION: acpi_ev_reg_run 628 * 629 * PARAMETERS: walk_namespace callback 630 * 631 * DESCRIPTION: Run _REG method for region objects of the requested spaceID 632 * 633 ******************************************************************************/ 634 635 static acpi_status 636 acpi_ev_reg_run(acpi_handle obj_handle, 637 u32 level, void *context, void **return_value) 638 { 639 union acpi_operand_object *obj_desc; 640 struct acpi_namespace_node *node; 641 acpi_adr_space_type space_id; 642 acpi_status status; 643 644 space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context); 645 646 /* Convert and validate the device handle */ 647 648 node = acpi_ns_validate_handle(obj_handle); 649 if (!node) { 650 return (AE_BAD_PARAMETER); 651 } 652 653 /* 654 * We only care about regions.and objects that are allowed to have address 655 * space handlers 656 */ 657 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { 658 return (AE_OK); 659 } 660 661 /* Check for an existing internal object */ 662 663 obj_desc = acpi_ns_get_attached_object(node); 664 if (!obj_desc) { 665 666 /* No object, just exit */ 667 668 return (AE_OK); 669 } 670 671 /* Object is a Region */ 672 673 if (obj_desc->region.space_id != space_id) { 674 675 /* This region is for a different address space, just ignore it */ 676 677 return (AE_OK); 678 } 679 680 status = acpi_ev_execute_reg_method(obj_desc, ACPI_REG_CONNECT); 681 return (status); 682 } 683 684 /******************************************************************************* 685 * 686 * FUNCTION: acpi_ev_orphan_ec_reg_method 687 * 688 * PARAMETERS: ec_device_node - Namespace node for an EC device 689 * 690 * RETURN: None 691 * 692 * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC 693 * device. This is a _REG method that has no corresponding region 694 * within the EC device scope. The orphan _REG method appears to 695 * have been enabled by the description of the ECDT in the ACPI 696 * specification: "The availability of the region space can be 697 * detected by providing a _REG method object underneath the 698 * Embedded Controller device." 699 * 700 * To quickly access the EC device, we use the ec_device_node used 701 * during EC handler installation. Otherwise, we would need to 702 * perform a time consuming namespace walk, executing _HID 703 * methods to find the EC device. 704 * 705 * MUTEX: Assumes the namespace is locked 706 * 707 ******************************************************************************/ 708 709 static void 710 acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node) 711 { 712 acpi_handle reg_method; 713 struct acpi_namespace_node *next_node; 714 acpi_status status; 715 struct acpi_object_list args; 716 union acpi_object objects[2]; 717 718 ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method); 719 720 if (!ec_device_node) { 721 return_VOID; 722 } 723 724 /* Namespace is currently locked, must release */ 725 726 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 727 728 /* Get a handle to a _REG method immediately under the EC device */ 729 730 status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ®_method); 731 if (ACPI_FAILURE(status)) { 732 goto exit; /* There is no _REG method present */ 733 } 734 735 /* 736 * Execute the _REG method only if there is no Operation Region in 737 * this scope with the Embedded Controller space ID. Otherwise, it 738 * will already have been executed. Note, this allows for Regions 739 * with other space IDs to be present; but the code below will then 740 * execute the _REG method with the embedded_control space_ID argument. 741 */ 742 next_node = acpi_ns_get_next_node(ec_device_node, NULL); 743 while (next_node) { 744 if ((next_node->type == ACPI_TYPE_REGION) && 745 (next_node->object) && 746 (next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) { 747 goto exit; /* Do not execute the _REG */ 748 } 749 750 next_node = acpi_ns_get_next_node(ec_device_node, next_node); 751 } 752 753 /* Evaluate the _REG(embedded_control,Connect) method */ 754 755 args.count = 2; 756 args.pointer = objects; 757 objects[0].type = ACPI_TYPE_INTEGER; 758 objects[0].integer.value = ACPI_ADR_SPACE_EC; 759 objects[1].type = ACPI_TYPE_INTEGER; 760 objects[1].integer.value = ACPI_REG_CONNECT; 761 762 status = acpi_evaluate_object(reg_method, NULL, &args, NULL); 763 764 exit: 765 /* We ignore all errors from above, don't care */ 766 767 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 768 return_VOID; 769 } 770