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 if (region_obj2->extra.region_context) { 221 222 /* The handler for this region was already installed */ 223 224 ACPI_FREE(region_context); 225 } else { 226 /* 227 * Save the returned context for use in all accesses to 228 * this particular region 229 */ 230 region_obj2->extra.region_context = 231 region_context; 232 } 233 } 234 } 235 236 /* We have everything we need, we can invoke the address space handler */ 237 238 handler = handler_desc->address_space.handler; 239 240 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 241 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n", 242 ®ion_obj->region.handler->address_space, handler, 243 ACPI_FORMAT_NATIVE_UINT(region_obj->region.address + 244 region_offset), 245 acpi_ut_get_region_name(region_obj->region. 246 space_id))); 247 248 /* 249 * Special handling for generic_serial_bus and general_purpose_io: 250 * There are three extra parameters that must be passed to the 251 * handler via the context: 252 * 1) Connection buffer, a resource template from Connection() op. 253 * 2) Length of the above buffer. 254 * 3) Actual access length from the access_as() op. 255 */ 256 if (((region_obj->region.space_id == ACPI_ADR_SPACE_GSBUS) || 257 (region_obj->region.space_id == ACPI_ADR_SPACE_GPIO)) && 258 context && field_obj) { 259 260 /* Get the Connection (resource_template) buffer */ 261 262 context->connection = field_obj->field.resource_buffer; 263 context->length = field_obj->field.resource_length; 264 context->access_length = field_obj->field.access_length; 265 } 266 267 if (!(handler_desc->address_space.handler_flags & 268 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 269 /* 270 * For handlers other than the default (supplied) handlers, we must 271 * exit the interpreter because the handler *might* block -- we don't 272 * know what it will do, so we can't hold the lock on the intepreter. 273 */ 274 acpi_ex_exit_interpreter(); 275 } 276 277 /* Call the handler */ 278 279 status = handler(function, 280 (region_obj->region.address + region_offset), 281 bit_width, value, context, 282 region_obj2->extra.region_context); 283 284 if (ACPI_FAILURE(status)) { 285 ACPI_EXCEPTION((AE_INFO, status, "Returned by Handler for [%s]", 286 acpi_ut_get_region_name(region_obj->region. 287 space_id))); 288 } 289 290 if (!(handler_desc->address_space.handler_flags & 291 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { 292 /* 293 * We just returned from a non-default handler, we must re-enter the 294 * interpreter 295 */ 296 acpi_ex_enter_interpreter(); 297 } 298 299 return_ACPI_STATUS(status); 300 } 301 302 /******************************************************************************* 303 * 304 * FUNCTION: acpi_ev_detach_region 305 * 306 * PARAMETERS: region_obj - Region Object 307 * acpi_ns_is_locked - Namespace Region Already Locked? 308 * 309 * RETURN: None 310 * 311 * DESCRIPTION: Break the association between the handler and the region 312 * this is a two way association. 313 * 314 ******************************************************************************/ 315 316 void 317 acpi_ev_detach_region(union acpi_operand_object *region_obj, 318 u8 acpi_ns_is_locked) 319 { 320 union acpi_operand_object *handler_obj; 321 union acpi_operand_object *obj_desc; 322 union acpi_operand_object **last_obj_ptr; 323 acpi_adr_space_setup region_setup; 324 void **region_context; 325 union acpi_operand_object *region_obj2; 326 acpi_status status; 327 328 ACPI_FUNCTION_TRACE(ev_detach_region); 329 330 region_obj2 = acpi_ns_get_secondary_object(region_obj); 331 if (!region_obj2) { 332 return_VOID; 333 } 334 region_context = ®ion_obj2->extra.region_context; 335 336 /* Get the address handler from the region object */ 337 338 handler_obj = region_obj->region.handler; 339 if (!handler_obj) { 340 341 /* This region has no handler, all done */ 342 343 return_VOID; 344 } 345 346 /* Find this region in the handler's list */ 347 348 obj_desc = handler_obj->address_space.region_list; 349 last_obj_ptr = &handler_obj->address_space.region_list; 350 351 while (obj_desc) { 352 353 /* Is this the correct Region? */ 354 355 if (obj_desc == region_obj) { 356 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 357 "Removing Region %p from address handler %p\n", 358 region_obj, handler_obj)); 359 360 /* This is it, remove it from the handler's list */ 361 362 *last_obj_ptr = obj_desc->region.next; 363 obj_desc->region.next = NULL; /* Must clear field */ 364 365 if (acpi_ns_is_locked) { 366 status = 367 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 368 if (ACPI_FAILURE(status)) { 369 return_VOID; 370 } 371 } 372 373 /* Now stop region accesses by executing the _REG method */ 374 375 status = 376 acpi_ev_execute_reg_method(region_obj, 377 ACPI_REG_DISCONNECT); 378 if (ACPI_FAILURE(status)) { 379 ACPI_EXCEPTION((AE_INFO, status, 380 "from region _REG, [%s]", 381 acpi_ut_get_region_name 382 (region_obj->region.space_id))); 383 } 384 385 if (acpi_ns_is_locked) { 386 status = 387 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 388 if (ACPI_FAILURE(status)) { 389 return_VOID; 390 } 391 } 392 393 /* 394 * If the region has been activated, call the setup handler with 395 * the deactivate notification 396 */ 397 if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) { 398 region_setup = handler_obj->address_space.setup; 399 status = 400 region_setup(region_obj, 401 ACPI_REGION_DEACTIVATE, 402 handler_obj->address_space. 403 context, region_context); 404 405 /* Init routine may fail, Just ignore errors */ 406 407 if (ACPI_FAILURE(status)) { 408 ACPI_EXCEPTION((AE_INFO, status, 409 "from region handler - deactivate, [%s]", 410 acpi_ut_get_region_name 411 (region_obj->region. 412 space_id))); 413 } 414 415 region_obj->region.flags &= 416 ~(AOPOBJ_SETUP_COMPLETE); 417 } 418 419 /* 420 * Remove handler reference in the region 421 * 422 * NOTE: this doesn't mean that the region goes away, the region 423 * is just inaccessible as indicated to the _REG method 424 * 425 * If the region is on the handler's list, this must be the 426 * region's handler 427 */ 428 region_obj->region.handler = NULL; 429 acpi_ut_remove_reference(handler_obj); 430 431 return_VOID; 432 } 433 434 /* Walk the linked list of handlers */ 435 436 last_obj_ptr = &obj_desc->region.next; 437 obj_desc = obj_desc->region.next; 438 } 439 440 /* If we get here, the region was not in the handler's region list */ 441 442 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 443 "Cannot remove region %p from address handler %p\n", 444 region_obj, handler_obj)); 445 446 return_VOID; 447 } 448 449 /******************************************************************************* 450 * 451 * FUNCTION: acpi_ev_attach_region 452 * 453 * PARAMETERS: handler_obj - Handler Object 454 * region_obj - Region Object 455 * acpi_ns_is_locked - Namespace Region Already Locked? 456 * 457 * RETURN: None 458 * 459 * DESCRIPTION: Create the association between the handler and the region 460 * this is a two way association. 461 * 462 ******************************************************************************/ 463 464 acpi_status 465 acpi_ev_attach_region(union acpi_operand_object *handler_obj, 466 union acpi_operand_object *region_obj, 467 u8 acpi_ns_is_locked) 468 { 469 470 ACPI_FUNCTION_TRACE(ev_attach_region); 471 472 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 473 "Adding Region [%4.4s] %p to address handler %p [%s]\n", 474 acpi_ut_get_node_name(region_obj->region.node), 475 region_obj, handler_obj, 476 acpi_ut_get_region_name(region_obj->region. 477 space_id))); 478 479 /* Link this region to the front of the handler's list */ 480 481 region_obj->region.next = handler_obj->address_space.region_list; 482 handler_obj->address_space.region_list = region_obj; 483 484 /* Install the region's handler */ 485 486 if (region_obj->region.handler) { 487 return_ACPI_STATUS(AE_ALREADY_EXISTS); 488 } 489 490 region_obj->region.handler = handler_obj; 491 acpi_ut_add_reference(handler_obj); 492 493 return_ACPI_STATUS(AE_OK); 494 } 495 496 /******************************************************************************* 497 * 498 * FUNCTION: acpi_ev_execute_reg_method 499 * 500 * PARAMETERS: region_obj - Region object 501 * function - Passed to _REG: On (1) or Off (0) 502 * 503 * RETURN: Status 504 * 505 * DESCRIPTION: Execute _REG method for a region 506 * 507 ******************************************************************************/ 508 509 acpi_status 510 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function) 511 { 512 struct acpi_evaluate_info *info; 513 union acpi_operand_object *args[3]; 514 union acpi_operand_object *region_obj2; 515 acpi_status status; 516 517 ACPI_FUNCTION_TRACE(ev_execute_reg_method); 518 519 region_obj2 = acpi_ns_get_secondary_object(region_obj); 520 if (!region_obj2) { 521 return_ACPI_STATUS(AE_NOT_EXIST); 522 } 523 524 if (region_obj2->extra.method_REG == NULL) { 525 return_ACPI_STATUS(AE_OK); 526 } 527 528 /* Allocate and initialize the evaluation information block */ 529 530 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 531 if (!info) { 532 return_ACPI_STATUS(AE_NO_MEMORY); 533 } 534 535 info->prefix_node = region_obj2->extra.method_REG; 536 info->relative_pathname = NULL; 537 info->parameters = args; 538 info->flags = ACPI_IGNORE_RETURN_VALUE; 539 540 /* 541 * The _REG method has two arguments: 542 * 543 * arg0 - Integer: 544 * Operation region space ID Same value as region_obj->Region.space_id 545 * 546 * arg1 - Integer: 547 * connection status 1 for connecting the handler, 0 for disconnecting 548 * the handler (Passed as a parameter) 549 */ 550 args[0] = 551 acpi_ut_create_integer_object((u64)region_obj->region.space_id); 552 if (!args[0]) { 553 status = AE_NO_MEMORY; 554 goto cleanup1; 555 } 556 557 args[1] = acpi_ut_create_integer_object((u64)function); 558 if (!args[1]) { 559 status = AE_NO_MEMORY; 560 goto cleanup2; 561 } 562 563 args[2] = NULL; /* Terminate list */ 564 565 /* Execute the method, no return value */ 566 567 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname 568 (ACPI_TYPE_METHOD, info->prefix_node, NULL)); 569 570 status = acpi_ns_evaluate(info); 571 acpi_ut_remove_reference(args[1]); 572 573 cleanup2: 574 acpi_ut_remove_reference(args[0]); 575 576 cleanup1: 577 ACPI_FREE(info); 578 return_ACPI_STATUS(status); 579 } 580 581 /******************************************************************************* 582 * 583 * FUNCTION: acpi_ev_execute_reg_methods 584 * 585 * PARAMETERS: node - Namespace node for the device 586 * space_id - The address space ID 587 * 588 * RETURN: Status 589 * 590 * DESCRIPTION: Run all _REG methods for the input Space ID; 591 * Note: assumes namespace is locked, or system init time. 592 * 593 ******************************************************************************/ 594 595 acpi_status 596 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, 597 acpi_adr_space_type space_id) 598 { 599 acpi_status status; 600 601 ACPI_FUNCTION_TRACE(ev_execute_reg_methods); 602 603 /* 604 * Run all _REG methods for all Operation Regions for this space ID. This 605 * is a separate walk in order to handle any interdependencies between 606 * regions and _REG methods. (i.e. handlers must be installed for all 607 * regions of this Space ID before we can run any _REG methods) 608 */ 609 status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX, 610 ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, 611 NULL, &space_id, NULL); 612 613 /* Special case for EC: handle "orphan" _REG methods with no region */ 614 615 if (space_id == ACPI_ADR_SPACE_EC) { 616 acpi_ev_orphan_ec_reg_method(node); 617 } 618 619 return_ACPI_STATUS(status); 620 } 621 622 /******************************************************************************* 623 * 624 * FUNCTION: acpi_ev_reg_run 625 * 626 * PARAMETERS: walk_namespace callback 627 * 628 * DESCRIPTION: Run _REG method for region objects of the requested spaceID 629 * 630 ******************************************************************************/ 631 632 static acpi_status 633 acpi_ev_reg_run(acpi_handle obj_handle, 634 u32 level, void *context, void **return_value) 635 { 636 union acpi_operand_object *obj_desc; 637 struct acpi_namespace_node *node; 638 acpi_adr_space_type space_id; 639 acpi_status status; 640 641 space_id = *ACPI_CAST_PTR(acpi_adr_space_type, context); 642 643 /* Convert and validate the device handle */ 644 645 node = acpi_ns_validate_handle(obj_handle); 646 if (!node) { 647 return (AE_BAD_PARAMETER); 648 } 649 650 /* 651 * We only care about regions.and objects that are allowed to have address 652 * space handlers 653 */ 654 if ((node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) { 655 return (AE_OK); 656 } 657 658 /* Check for an existing internal object */ 659 660 obj_desc = acpi_ns_get_attached_object(node); 661 if (!obj_desc) { 662 663 /* No object, just exit */ 664 665 return (AE_OK); 666 } 667 668 /* Object is a Region */ 669 670 if (obj_desc->region.space_id != space_id) { 671 672 /* This region is for a different address space, just ignore it */ 673 674 return (AE_OK); 675 } 676 677 status = acpi_ev_execute_reg_method(obj_desc, ACPI_REG_CONNECT); 678 return (status); 679 } 680 681 /******************************************************************************* 682 * 683 * FUNCTION: acpi_ev_orphan_ec_reg_method 684 * 685 * PARAMETERS: ec_device_node - Namespace node for an EC device 686 * 687 * RETURN: None 688 * 689 * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC 690 * device. This is a _REG method that has no corresponding region 691 * within the EC device scope. The orphan _REG method appears to 692 * have been enabled by the description of the ECDT in the ACPI 693 * specification: "The availability of the region space can be 694 * detected by providing a _REG method object underneath the 695 * Embedded Controller device." 696 * 697 * To quickly access the EC device, we use the ec_device_node used 698 * during EC handler installation. Otherwise, we would need to 699 * perform a time consuming namespace walk, executing _HID 700 * methods to find the EC device. 701 * 702 * MUTEX: Assumes the namespace is locked 703 * 704 ******************************************************************************/ 705 706 static void 707 acpi_ev_orphan_ec_reg_method(struct acpi_namespace_node *ec_device_node) 708 { 709 acpi_handle reg_method; 710 struct acpi_namespace_node *next_node; 711 acpi_status status; 712 struct acpi_object_list args; 713 union acpi_object objects[2]; 714 715 ACPI_FUNCTION_TRACE(ev_orphan_ec_reg_method); 716 717 if (!ec_device_node) { 718 return_VOID; 719 } 720 721 /* Namespace is currently locked, must release */ 722 723 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 724 725 /* Get a handle to a _REG method immediately under the EC device */ 726 727 status = acpi_get_handle(ec_device_node, METHOD_NAME__REG, ®_method); 728 if (ACPI_FAILURE(status)) { 729 goto exit; /* There is no _REG method present */ 730 } 731 732 /* 733 * Execute the _REG method only if there is no Operation Region in 734 * this scope with the Embedded Controller space ID. Otherwise, it 735 * will already have been executed. Note, this allows for Regions 736 * with other space IDs to be present; but the code below will then 737 * execute the _REG method with the embedded_control space_ID argument. 738 */ 739 next_node = acpi_ns_get_next_node(ec_device_node, NULL); 740 while (next_node) { 741 if ((next_node->type == ACPI_TYPE_REGION) && 742 (next_node->object) && 743 (next_node->object->region.space_id == ACPI_ADR_SPACE_EC)) { 744 goto exit; /* Do not execute the _REG */ 745 } 746 747 next_node = acpi_ns_get_next_node(ec_device_node, next_node); 748 } 749 750 /* Evaluate the _REG(embedded_control,Connect) method */ 751 752 args.count = 2; 753 args.pointer = objects; 754 objects[0].type = ACPI_TYPE_INTEGER; 755 objects[0].integer.value = ACPI_ADR_SPACE_EC; 756 objects[1].type = ACPI_TYPE_INTEGER; 757 objects[1].integer.value = ACPI_REG_CONNECT; 758 759 status = acpi_evaluate_object(reg_method, NULL, &args, NULL); 760 761 exit: 762 /* We ignore all errors from above, don't care */ 763 764 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 765 return_VOID; 766 } 767