arch/all-pc/acpica/source/components/events/evregion.c

   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
  45 #define __EVREGION_C__
  46
  47 #include "acpi.h"
  48 #include "accommon.h"
  49 #include "acevents.h"
  50 #include "acnamesp.h"
  51 #include "acinterp.h"
  52
  53 #define _COMPONENT          ACPI_EVENTS
  54         ACPI_MODULE_NAME    ("evregion")
  55
  56
  57 extern UINT8        AcpiGbl_DefaultAddressSpaces[];
  58
  59 /* Local prototypes */
  60
  61 static void
  62 AcpiEvOrphanEcRegMethod (
  63     ACPI_NAMESPACE_NODE     *EcDeviceNode);
  64
  65 static ACPI_STATUS
  66 AcpiEvRegRun (
  67     ACPI_HANDLE             ObjHandle,
  68     UINT32                  Level,
  69     void                    *Context,
  70     void                    **ReturnValue);
  71
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    AcpiEvInitializeOpRegions
  76  *
  77  * PARAMETERS:  None
  78  *
  79  * RETURN:      Status
  80  *
  81  * DESCRIPTION: Execute _REG methods for all Operation Regions that have
  82  *              an installed default region handler.
  83  *
  84  ******************************************************************************/
  85
  86 ACPI_STATUS
  87 AcpiEvInitializeOpRegions (
  88     void)
  89 {
  90     ACPI_STATUS             Status;
  91     UINT32                  i;
  92
  93
  94     ACPI_FUNCTION_TRACE (EvInitializeOpRegions);
  95
  96
  97     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
  98     if (ACPI_FAILURE (Status))
  99     {
 100         return_ACPI_STATUS (Status);
 101     }
 102
 103     /* Run the _REG methods for OpRegions in each default address space */
 104
 105     for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++)
 106     {
 107         /*
 108          * Make sure the installed handler is the DEFAULT handler. If not the
 109          * default, the _REG methods will have already been run (when the
 110          * handler was installed)
 111          */
 112         if (AcpiEvHasDefaultHandler (AcpiGbl_RootNode,
 113                AcpiGbl_DefaultAddressSpaces[i]))
 114         {
 115             Status = AcpiEvExecuteRegMethods (AcpiGbl_RootNode,
 116                         AcpiGbl_DefaultAddressSpaces[i]);
 117         }
 118     }
 119
 120     AcpiGbl_RegMethodsExecuted = TRUE;
 121
 122     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 123     return_ACPI_STATUS (Status);
 124 }
 125
 126
 127 /*******************************************************************************
 128  *
 129  * FUNCTION:    AcpiEvAddressSpaceDispatch
 130  *
 131  * PARAMETERS:  RegionObj           - Internal region object
 132  *              FieldObj            - Corresponding field. Can be NULL.
 133  *              Function            - Read or Write operation
 134  *              RegionOffset        - Where in the region to read or write
 135  *              BitWidth            - Field width in bits (8, 16, 32, or 64)
 136  *              Value               - Pointer to in or out value, must be
 137  *                                    a full 64-bit integer
 138  *
 139  * RETURN:      Status
 140  *
 141  * DESCRIPTION: Dispatch an address space or operation region access to
 142  *              a previously installed handler.
 143  *
 144  ******************************************************************************/
 145
 146 ACPI_STATUS
 147 AcpiEvAddressSpaceDispatch (
 148     ACPI_OPERAND_OBJECT     *RegionObj,
 149     ACPI_OPERAND_OBJECT     *FieldObj,
 150     UINT32                  Function,
 151     UINT32                  RegionOffset,
 152     UINT32                  BitWidth,
 153     UINT64                  *Value)
 154 {
 155     ACPI_STATUS             Status;
 156     ACPI_ADR_SPACE_HANDLER  Handler;
 157     ACPI_ADR_SPACE_SETUP    RegionSetup;
 158     ACPI_OPERAND_OBJECT     *HandlerDesc;
 159     ACPI_OPERAND_OBJECT     *RegionObj2;
 160     void                    *RegionContext = NULL;
 161     ACPI_CONNECTION_INFO    *Context;
 162
 163
 164     ACPI_FUNCTION_TRACE (EvAddressSpaceDispatch);
 165
 166
 167     RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);
 168     if (!RegionObj2)
 169     {
 170         return_ACPI_STATUS (AE_NOT_EXIST);
 171     }
 172
 173     /* Ensure that there is a handler associated with this region */
 174
 175     HandlerDesc = RegionObj->Region.Handler;
 176     if (!HandlerDesc)
 177     {
 178         ACPI_ERROR ((AE_INFO,
 179             "No handler for Region [%4.4s] (%p) [%s]",
 180             AcpiUtGetNodeName (RegionObj->Region.Node),
 181             RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 182
 183         return_ACPI_STATUS (AE_NOT_EXIST);
 184     }
 185
 186     Context = HandlerDesc->AddressSpace.Context;
 187
 188     /*
 189      * It may be the case that the region has never been initialized.
 190      * Some types of regions require special init code
 191      */
 192     if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
 193     {
 194         /* This region has not been initialized yet, do it */
 195
 196         RegionSetup = HandlerDesc->AddressSpace.Setup;
 197         if (!RegionSetup)
 198         {
 199             /* No initialization routine, exit with error */
 200
 201             ACPI_ERROR ((AE_INFO,
 202                 "No init routine for region(%p) [%s]",
 203                 RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 204             return_ACPI_STATUS (AE_NOT_EXIST);
 205         }
 206
 207         /*
 208          * We must exit the interpreter because the region setup will
 209          * potentially execute control methods (for example, the _REG method
 210          * for this region)
 211          */
 212         AcpiExExitInterpreter ();
 213
 214         Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE,
 215                     Context, &RegionContext);
 216
 217         /* Re-enter the interpreter */
 218
 219         AcpiExEnterInterpreter ();
 220
 221         /* Check for failure of the Region Setup */
 222
 223         if (ACPI_FAILURE (Status))
 224         {
 225             ACPI_EXCEPTION ((AE_INFO, Status,
 226                 "During region initialization: [%s]",
 227                 AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 228             return_ACPI_STATUS (Status);
 229         }
 230
 231         /* Region initialization may have been completed by RegionSetup */
 232
 233         if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))
 234         {
 235             RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE;
 236
 237             /*
 238              * Save the returned context for use in all accesses to
 239              * the handler for this particular region
 240              */
 241             if (!(RegionObj2->Extra.RegionContext))
 242             {
 243                 RegionObj2->Extra.RegionContext = RegionContext;
 244             }
 245         }
 246     }
 247
 248     /* We have everything we need, we can invoke the address space handler */
 249
 250     Handler = HandlerDesc->AddressSpace.Handler;
 251
 252     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 253         "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
 254         &RegionObj->Region.Handler->AddressSpace, Handler,
 255         ACPI_FORMAT_NATIVE_UINT (RegionObj->Region.Address + RegionOffset),
 256         AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 257
 258     /*
 259      * Special handling for GenericSerialBus and GeneralPurposeIo:
 260      * There are three extra parameters that must be passed to the
 261      * handler via the context:
 262      *   1) Connection buffer, a resource template from Connection() op.
 263      *   2) Length of the above buffer.
 264      *   3) Actual access length from the AccessAs() op.
 265      */
 266     if (((RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS) ||
 267             (RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO)) &&
 268         Context &&
 269         FieldObj)
 270     {
 271         /* Get the Connection (ResourceTemplate) buffer */
 272
 273         Context->Connection = FieldObj->Field.ResourceBuffer;
 274         Context->Length = FieldObj->Field.ResourceLength;
 275         Context->AccessLength = FieldObj->Field.AccessLength;
 276     }
 277
 278     if (!(HandlerDesc->AddressSpace.HandlerFlags &
 279             ACPI_ADDR_HANDLER_DEFAULT_INSTALLED))
 280     {
 281         /*
 282          * For handlers other than the default (supplied) handlers, we must
 283          * exit the interpreter because the handler *might* block -- we don't
 284          * know what it will do, so we can't hold the lock on the intepreter.
 285          */
 286         AcpiExExitInterpreter();
 287     }
 288
 289     /* Call the handler */
 290
 291     Status = Handler (Function,
 292         (RegionObj->Region.Address + RegionOffset), BitWidth, Value,
 293         Context, RegionObj2->Extra.RegionContext);
 294
 295     if (ACPI_FAILURE (Status))
 296     {
 297         ACPI_EXCEPTION ((AE_INFO, Status, "Returned by Handler for [%s]",
 298             AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 299     }
 300
 301     if (!(HandlerDesc->AddressSpace.HandlerFlags &
 302             ACPI_ADDR_HANDLER_DEFAULT_INSTALLED))
 303     {
 304         /*
 305          * We just returned from a non-default handler, we must re-enter the
 306          * interpreter
 307          */
 308        AcpiExEnterInterpreter ();
 309     }
 310
 311     return_ACPI_STATUS (Status);
 312 }
 313
 314
 315 /*******************************************************************************
 316  *
 317  * FUNCTION:    AcpiEvDetachRegion
 318  *
 319  * PARAMETERS:  RegionObj           - Region Object
 320  *              AcpiNsIsLocked      - Namespace Region Already Locked?
 321  *
 322  * RETURN:      None
 323  *
 324  * DESCRIPTION: Break the association between the handler and the region
 325  *              this is a two way association.
 326  *
 327  ******************************************************************************/
 328
 329 void
 330 AcpiEvDetachRegion(
 331     ACPI_OPERAND_OBJECT     *RegionObj,
 332     BOOLEAN                 AcpiNsIsLocked)
 333 {
 334     ACPI_OPERAND_OBJECT     *HandlerObj;
 335     ACPI_OPERAND_OBJECT     *ObjDesc;
 336     ACPI_OPERAND_OBJECT     **LastObjPtr;
 337     ACPI_ADR_SPACE_SETUP    RegionSetup;
 338     void                    **RegionContext;
 339     ACPI_OPERAND_OBJECT     *RegionObj2;
 340     ACPI_STATUS             Status;
 341
 342
 343     ACPI_FUNCTION_TRACE (EvDetachRegion);
 344
 345
 346     RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);
 347     if (!RegionObj2)
 348     {
 349         return_VOID;
 350     }
 351     RegionContext = &RegionObj2->Extra.RegionContext;
 352
 353     /* Get the address handler from the region object */
 354
 355     HandlerObj = RegionObj->Region.Handler;
 356     if (!HandlerObj)
 357     {
 358         /* This region has no handler, all done */
 359
 360         return_VOID;
 361     }
 362
 363     /* Find this region in the handler's list */
 364
 365     ObjDesc = HandlerObj->AddressSpace.RegionList;
 366     LastObjPtr = &HandlerObj->AddressSpace.RegionList;
 367
 368     while (ObjDesc)
 369     {
 370         /* Is this the correct Region? */
 371
 372         if (ObjDesc == RegionObj)
 373         {
 374             ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 375                 "Removing Region %p from address handler %p\n",
 376                 RegionObj, HandlerObj));
 377
 378             /* This is it, remove it from the handler's list */
 379
 380             *LastObjPtr = ObjDesc->Region.Next;
 381             ObjDesc->Region.Next = NULL;        /* Must clear field */
 382
 383             if (AcpiNsIsLocked)
 384             {
 385                 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 386                 if (ACPI_FAILURE (Status))
 387                 {
 388                     return_VOID;
 389                 }
 390             }
 391
 392             /* Now stop region accesses by executing the _REG method */
 393
 394             Status = AcpiEvExecuteRegMethod (RegionObj, ACPI_REG_DISCONNECT);
 395             if (ACPI_FAILURE (Status))
 396             {
 397                 ACPI_EXCEPTION ((AE_INFO, Status, "from region _REG, [%s]",
 398                     AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 399             }
 400
 401             if (AcpiNsIsLocked)
 402             {
 403                 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 404                 if (ACPI_FAILURE (Status))
 405                 {
 406                     return_VOID;
 407                 }
 408             }
 409
 410             /*
 411              * If the region has been activated, call the setup handler with
 412              * the deactivate notification
 413              */
 414             if (RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE)
 415             {
 416                 RegionSetup = HandlerObj->AddressSpace.Setup;
 417                 Status = RegionSetup (RegionObj, ACPI_REGION_DEACTIVATE,
 418                     HandlerObj->AddressSpace.Context, RegionContext);
 419
 420                 /*
 421                  * RegionContext should have been released by the deactivate
 422                  * operation. We don't need access to it anymore here.
 423                  */
 424                 if (RegionContext)
 425                 {
 426                     *RegionContext = NULL;
 427                 }
 428
 429                 /* Init routine may fail, Just ignore errors */
 430
 431                 if (ACPI_FAILURE (Status))
 432                 {
 433                     ACPI_EXCEPTION ((AE_INFO, Status,
 434                         "from region handler - deactivate, [%s]",
 435                         AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 436                 }
 437
 438                 RegionObj->Region.Flags &= ~(AOPOBJ_SETUP_COMPLETE);
 439             }
 440
 441             /*
 442              * Remove handler reference in the region
 443              *
 444              * NOTE: this doesn't mean that the region goes away, the region
 445              * is just inaccessible as indicated to the _REG method
 446              *
 447              * If the region is on the handler's list, this must be the
 448              * region's handler
 449              */
 450             RegionObj->Region.Handler = NULL;
 451             AcpiUtRemoveReference (HandlerObj);
 452
 453             return_VOID;
 454         }
 455
 456         /* Walk the linked list of handlers */
 457
 458         LastObjPtr = &ObjDesc->Region.Next;
 459         ObjDesc = ObjDesc->Region.Next;
 460     }
 461
 462     /* If we get here, the region was not in the handler's region list */
 463
 464     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 465         "Cannot remove region %p from address handler %p\n",
 466         RegionObj, HandlerObj));
 467
 468     return_VOID;
 469 }
 470
 471
 472 /*******************************************************************************
 473  *
 474  * FUNCTION:    AcpiEvAttachRegion
 475  *
 476  * PARAMETERS:  HandlerObj          - Handler Object
 477  *              RegionObj           - Region Object
 478  *              AcpiNsIsLocked      - Namespace Region Already Locked?
 479  *
 480  * RETURN:      None
 481  *
 482  * DESCRIPTION: Create the association between the handler and the region
 483  *              this is a two way association.
 484  *
 485  ******************************************************************************/
 486
 487 ACPI_STATUS
 488 AcpiEvAttachRegion (
 489     ACPI_OPERAND_OBJECT     *HandlerObj,
 490     ACPI_OPERAND_OBJECT     *RegionObj,
 491     BOOLEAN                 AcpiNsIsLocked)
 492 {
 493
 494     ACPI_FUNCTION_TRACE (EvAttachRegion);
 495
 496
 497     ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 498         "Adding Region [%4.4s] %p to address handler %p [%s]\n",
 499         AcpiUtGetNodeName (RegionObj->Region.Node),
 500         RegionObj, HandlerObj,
 501         AcpiUtGetRegionName (RegionObj->Region.SpaceId)));
 502
 503     /* Link this region to the front of the handler's list */
 504
 505     RegionObj->Region.Next = HandlerObj->AddressSpace.RegionList;
 506     HandlerObj->AddressSpace.RegionList = RegionObj;
 507
 508     /* Install the region's handler */
 509
 510     if (RegionObj->Region.Handler)
 511     {
 512         return_ACPI_STATUS (AE_ALREADY_EXISTS);
 513     }
 514
 515     RegionObj->Region.Handler = HandlerObj;
 516     AcpiUtAddReference (HandlerObj);
 517
 518     return_ACPI_STATUS (AE_OK);
 519 }
 520
 521
 522 /*******************************************************************************
 523  *
 524  * FUNCTION:    AcpiEvExecuteRegMethod
 525  *
 526  * PARAMETERS:  RegionObj           - Region object
 527  *              Function            - Passed to _REG: On (1) or Off (0)
 528  *
 529  * RETURN:      Status
 530  *
 531  * DESCRIPTION: Execute _REG method for a region
 532  *
 533  ******************************************************************************/
 534
 535 ACPI_STATUS
 536 AcpiEvExecuteRegMethod (
 537     ACPI_OPERAND_OBJECT     *RegionObj,
 538     UINT32                  Function)
 539 {
 540     ACPI_EVALUATE_INFO      *Info;
 541     ACPI_OPERAND_OBJECT     *Args[3];
 542     ACPI_OPERAND_OBJECT     *RegionObj2;
 543     ACPI_STATUS             Status;
 544
 545
 546     ACPI_FUNCTION_TRACE (EvExecuteRegMethod);
 547
 548
 549     RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);
 550     if (!RegionObj2)
 551     {
 552         return_ACPI_STATUS (AE_NOT_EXIST);
 553     }
 554
 555     if (RegionObj2->Extra.Method_REG == NULL)
 556     {
 557         return_ACPI_STATUS (AE_OK);
 558     }
 559
 560     /* Allocate and initialize the evaluation information block */
 561
 562     Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
 563     if (!Info)
 564     {
 565         return_ACPI_STATUS (AE_NO_MEMORY);
 566     }
 567
 568     Info->PrefixNode = RegionObj2->Extra.Method_REG;
 569     Info->RelativePathname = NULL;
 570     Info->Parameters = Args;
 571     Info->Flags = ACPI_IGNORE_RETURN_VALUE;
 572
 573     /*
 574      * The _REG method has two arguments:
 575      *
 576      * Arg0 - Integer:
 577      *  Operation region space ID Same value as RegionObj->Region.SpaceId
 578      *
 579      * Arg1 - Integer:
 580      *  connection status 1 for connecting the handler, 0 for disconnecting
 581      *  the handler (Passed as a parameter)
 582      */
 583     Args[0] = AcpiUtCreateIntegerObject ((UINT64) RegionObj->Region.SpaceId);
 584     if (!Args[0])
 585     {
 586         Status = AE_NO_MEMORY;
 587         goto Cleanup1;
 588     }
 589
 590     Args[1] = AcpiUtCreateIntegerObject ((UINT64) Function);
 591     if (!Args[1])
 592     {
 593         Status = AE_NO_MEMORY;
 594         goto Cleanup2;
 595     }
 596
 597     Args[2] = NULL; /* Terminate list */
 598
 599     /* Execute the method, no return value */
 600
 601     ACPI_DEBUG_EXEC (
 602         AcpiUtDisplayInitPathname (ACPI_TYPE_METHOD, Info->PrefixNode, NULL));
 603
 604     Status = AcpiNsEvaluate (Info);
 605     AcpiUtRemoveReference (Args[1]);
 606
 607 Cleanup2:
 608     AcpiUtRemoveReference (Args[0]);
 609
 610 Cleanup1:
 611     ACPI_FREE (Info);
 612     return_ACPI_STATUS (Status);
 613 }
 614
 615
 616 /*******************************************************************************
 617  *
 618  * FUNCTION:    AcpiEvExecuteRegMethods
 619  *
 620  * PARAMETERS:  Node            - Namespace node for the device
 621  *              SpaceId         - The address space ID
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Run all _REG methods for the input Space ID;
 626  *              Note: assumes namespace is locked, or system init time.
 627  *
 628  ******************************************************************************/
 629
 630 ACPI_STATUS
 631 AcpiEvExecuteRegMethods (
 632     ACPI_NAMESPACE_NODE     *Node,
 633     ACPI_ADR_SPACE_TYPE     SpaceId)
 634 {
 635     ACPI_STATUS             Status;
 636
 637
 638     ACPI_FUNCTION_TRACE (EvExecuteRegMethods);
 639
 640
 641     /*
 642      * Run all _REG methods for all Operation Regions for this space ID. This
 643      * is a separate walk in order to handle any interdependencies between
 644      * regions and _REG methods. (i.e. handlers must be installed for all
 645      * regions of this Space ID before we can run any _REG methods)
 646      */
 647     Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, Node, ACPI_UINT32_MAX,
 648                 ACPI_NS_WALK_UNLOCK, AcpiEvRegRun, NULL,
 649                 &SpaceId, NULL);
 650
 651     /* Special case for EC: handle "orphan" _REG methods with no region */
 652
 653     if (SpaceId == ACPI_ADR_SPACE_EC)
 654     {
 655         AcpiEvOrphanEcRegMethod (Node);
 656     }
 657
 658     return_ACPI_STATUS (Status);
 659 }
 660
 661
 662 /*******************************************************************************
 663  *
 664  * FUNCTION:    AcpiEvRegRun
 665  *
 666  * PARAMETERS:  WalkNamespace callback
 667  *
 668  * DESCRIPTION: Run _REG method for region objects of the requested spaceID
 669  *
 670  ******************************************************************************/
 671
 672 static ACPI_STATUS
 673 AcpiEvRegRun (
 674     ACPI_HANDLE             ObjHandle,
 675     UINT32                  Level,
 676     void                    *Context,
 677     void                    **ReturnValue)
 678 {
 679     ACPI_OPERAND_OBJECT     *ObjDesc;
 680     ACPI_NAMESPACE_NODE     *Node;
 681     ACPI_ADR_SPACE_TYPE     SpaceId;
 682     ACPI_STATUS             Status;
 683
 684
 685     SpaceId = *ACPI_CAST_PTR (ACPI_ADR_SPACE_TYPE, Context);
 686
 687     /* Convert and validate the device handle */
 688
 689     Node = AcpiNsValidateHandle (ObjHandle);
 690     if (!Node)
 691     {
 692         return (AE_BAD_PARAMETER);
 693     }
 694
 695     /*
 696      * We only care about regions.and objects that are allowed to have address
 697      * space handlers
 698      */
 699     if ((Node->Type != ACPI_TYPE_REGION) &&
 700         (Node != AcpiGbl_RootNode))
 701     {
 702         return (AE_OK);
 703     }
 704
 705     /* Check for an existing internal object */
 706
 707     ObjDesc = AcpiNsGetAttachedObject (Node);
 708     if (!ObjDesc)
 709     {
 710         /* No object, just exit */
 711
 712         return (AE_OK);
 713     }
 714
 715     /* Object is a Region */
 716
 717     if (ObjDesc->Region.SpaceId != SpaceId)
 718     {
 719         /* This region is for a different address space, just ignore it */
 720
 721         return (AE_OK);
 722     }
 723
 724     Status = AcpiEvExecuteRegMethod (ObjDesc, ACPI_REG_CONNECT);
 725     return (Status);
 726 }
 727
 728
 729 /*******************************************************************************
 730  *
 731  * FUNCTION:    AcpiEvOrphanEcRegMethod
 732  *
 733  * PARAMETERS:  EcDeviceNode        - Namespace node for an EC device
 734  *
 735  * RETURN:      None
 736  *
 737  * DESCRIPTION: Execute an "orphan" _REG method that appears under the EC
 738  *              device. This is a _REG method that has no corresponding region
 739  *              within the EC device scope. The orphan _REG method appears to
 740  *              have been enabled by the description of the ECDT in the ACPI
 741  *              specification: "The availability of the region space can be
 742  *              detected by providing a _REG method object underneath the
 743  *              Embedded Controller device."
 744  *
 745  *              To quickly access the EC device, we use the EcDeviceNode used
 746  *              during EC handler installation. Otherwise, we would need to
 747  *              perform a time consuming namespace walk, executing _HID
 748  *              methods to find the EC device.
 749  *
 750  *  MUTEX:      Assumes the namespace is locked
 751  *
 752  ******************************************************************************/
 753
 754 static void
 755 AcpiEvOrphanEcRegMethod (
 756     ACPI_NAMESPACE_NODE     *EcDeviceNode)
 757 {
 758     ACPI_HANDLE             RegMethod;
 759     ACPI_NAMESPACE_NODE     *NextNode;
 760     ACPI_STATUS             Status;
 761     ACPI_OBJECT_LIST        Args;
 762     ACPI_OBJECT             Objects[2];
 763
 764
 765     ACPI_FUNCTION_TRACE (EvOrphanEcRegMethod);
 766
 767
 768     if (!EcDeviceNode)
 769     {
 770         return_VOID;
 771     }
 772
 773     /* Namespace is currently locked, must release */
 774
 775     (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
 776
 777     /* Get a handle to a _REG method immediately under the EC device */
 778
 779     Status = AcpiGetHandle (EcDeviceNode, METHOD_NAME__REG, &RegMethod);
 780     if (ACPI_FAILURE (Status))
 781     {
 782         goto Exit; /* There is no _REG method present */
 783     }
 784
 785     /*
 786      * Execute the _REG method only if there is no Operation Region in
 787      * this scope with the Embedded Controller space ID. Otherwise, it
 788      * will already have been executed. Note, this allows for Regions
 789      * with other space IDs to be present; but the code below will then
 790      * execute the _REG method with the EmbeddedControl SpaceID argument.
 791      */
 792     NextNode = AcpiNsGetNextNode (EcDeviceNode, NULL);
 793     while (NextNode)
 794     {
 795         if ((NextNode->Type == ACPI_TYPE_REGION) &&
 796             (NextNode->Object) &&
 797             (NextNode->Object->Region.SpaceId == ACPI_ADR_SPACE_EC))
 798         {
 799             goto Exit; /* Do not execute the _REG */
 800         }
 801
 802         NextNode = AcpiNsGetNextNode (EcDeviceNode, NextNode);
 803     }
 804
 805     /* Evaluate the _REG(EmbeddedControl,Connect) method */
 806
 807     Args.Count = 2;
 808     Args.Pointer = Objects;
 809     Objects[0].Type = ACPI_TYPE_INTEGER;
 810     Objects[0].Integer.Value = ACPI_ADR_SPACE_EC;
 811     Objects[1].Type = ACPI_TYPE_INTEGER;
 812     Objects[1].Integer.Value = ACPI_REG_CONNECT;
 813
 814     Status = AcpiEvaluateObject (RegMethod, NULL, &Args, NULL);
 815
 816 Exit:
 817     /* We ignore all errors from above, don't care */
 818
 819     Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
 820     return_VOID;
 821 }