evgpe.c

acpi tools for linux include acpiexec and acpixtract

/******************************************************************************
 *
 * Module Name: evgpe - General Purpose Event handling and dispatch
 *              $Revision: 1.71 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, Intel Corp.
 * All rights reserved.
 *
 * 2. License
 *
 * 2.1. This is your license from Intel Corp. under its intellectual property
 * rights.  You may have additional license terms from the party that provided
 * you this software, covering your right to use that party's intellectual
 * property rights.
 *
 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
 * copy of the source code appearing in this file ("Covered Code") an
 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
 * base code distributed originally by Intel ("Original Intel Code") to copy,
 * make derivatives, distribute, use and display any portion of the Covered
 * Code in any form, with the right to sublicense such rights; and
 *
 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
 * license (with the right to sublicense), under only those claims of Intel
 * patents that are infringed by the Original Intel Code, to make, use, sell,
 * offer to sell, and import the Covered Code and derivative works thereof
 * solely to the minimum extent necessary to exercise the above copyright
 * license, and in no event shall the patent license extend to any additions
 * to or modifications of the Original Intel Code.  No other license or right
 * is granted directly or by implication, estoppel or otherwise;
 *
 * The above copyright and patent license is granted only if the following
 * conditions are met:
 *
 * 3. Conditions
 *
 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification with rights to further distribute source must include
 * the above Copyright Notice, the above License, this list of Conditions,
 * and the following Disclaimer and Export Compliance provision.  In addition,
 * Licensee must cause all Covered Code to which Licensee contributes to
 * contain a file documenting the changes Licensee made to create that Covered
 * Code and the date of any change.  Licensee must include in that file the
 * documentation of any changes made by any predecessor Licensee.  Licensee
 * must include a prominent statement that the modification is derived,
 * directly or indirectly, from Original Intel Code.
 *
 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
 * Redistribution of source code of any substantial portion of the Covered
 * Code or modification without rights to further distribute source must
 * include the following Disclaimer and Export Compliance provision in the
 * documentation and/or other materials provided with distribution.  In
 * addition, Licensee may not authorize further sublicense of source of any
 * portion of the Covered Code, and must include terms to the effect that the
 * license from Licensee to its licensee is limited to the intellectual
 * property embodied in the software Licensee provides to its licensee, and
 * not to intellectual property embodied in modifications its licensee may
 * make.
 *
 * 3.3. Redistribution of Executable. Redistribution in executable form of any
 * substantial portion of the Covered Code or modification must reproduce the
 * above Copyright Notice, and the following Disclaimer and Export Compliance
 * provision in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3.4. Intel retains all right, title, and interest in and to the Original
 * Intel Code.
 *
 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
 * Intel shall be used in advertising or otherwise to promote the sale, use or
 * other dealings in products derived from or relating to the Covered Code
 * without prior written authorization from Intel.
 *
 * 4. Disclaimer and Export Compliance
 *
 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
 * LIMITED REMEDY.
 *
 * 4.3. Licensee shall not export, either directly or indirectly, any of this
 * software or system incorporating such software without first obtaining any
 * required license or other approval from the U. S. Department of Commerce or
 * any other agency or department of the United States Government.  In the
 * event Licensee exports any such software from the United States or
 * re-exports any such software from a foreign destination, Licensee shall
 * ensure that the distribution and export/re-export of the software is in
 * compliance with all laws, regulations, orders, or other restrictions of the
 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
 * any of its subsidiaries will export/re-export any technical data, process,
 * software, or service, directly or indirectly, to any country for which the
 * United States government or any agency thereof requires an export license,
 * other governmental approval, or letter of assurance, without first obtaining
 * such license, approval or letter.
 *
 *****************************************************************************/

#include "acpi.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
        ACPI_MODULE_NAME    ("evgpe")

/* Local prototypes */

static void ACPI_SYSTEM_XFACE
AcpiEvAsynchExecuteGpeMethod (
    void                    *Context);

static void ACPI_SYSTEM_XFACE
AcpiEvAsynchEnableGpe (
    void                    *Context);


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvSetGpeType
 *
 * PARAMETERS:  GpeEventInfo            - GPE to set
 *              Type                    - New type
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvSetGpeType (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    UINT8                   Type)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvSetGpeType);


    /* Validate type and update register enable masks */

    switch (Type)
    {
    case ACPI_GPE_TYPE_WAKE:
    case ACPI_GPE_TYPE_RUNTIME:
    case ACPI_GPE_TYPE_WAKE_RUN:
        break;

    default:
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Disable the GPE if currently enabled */

    Status = AcpiEvDisableGpe (GpeEventInfo);

    /* Type was validated above */

    GpeEventInfo->Flags &= ~ACPI_GPE_TYPE_MASK; /* Clear type bits */
    GpeEventInfo->Flags |= Type;                /* Insert type */
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvUpdateGpeEnableMasks
 *
 * PARAMETERS:  GpeEventInfo            - GPE to update
 *              Type                    - What to do: ACPI_GPE_DISABLE or
 *                                        ACPI_GPE_ENABLE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Updates GPE register enable masks based on the GPE type
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvUpdateGpeEnableMasks (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    UINT8                   Type)
{
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
    UINT8                   RegisterBit;


    ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMasks);


    GpeRegisterInfo = GpeEventInfo->RegisterInfo;
    if (!GpeRegisterInfo)
    {
        return_ACPI_STATUS (AE_NOT_EXIST);
    }
    RegisterBit = (UINT8)
        (1 << (GpeEventInfo->GpeNumber - GpeRegisterInfo->BaseGpeNumber));

    /* 1) Disable case.  Simply clear all enable bits */

    if (Type == ACPI_GPE_DISABLE)
    {
        ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
        ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
        return_ACPI_STATUS (AE_OK);
    }

    /* 2) Enable case.  Set/Clear the appropriate enable bits */

    switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
    {
    case ACPI_GPE_TYPE_WAKE:
        ACPI_SET_BIT   (GpeRegisterInfo->EnableForWake, RegisterBit);
        ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
        break;

    case ACPI_GPE_TYPE_RUNTIME:
        ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForWake, RegisterBit);
        ACPI_SET_BIT   (GpeRegisterInfo->EnableForRun, RegisterBit);
        break;

    case ACPI_GPE_TYPE_WAKE_RUN:
        ACPI_SET_BIT   (GpeRegisterInfo->EnableForWake, RegisterBit);
        ACPI_SET_BIT   (GpeRegisterInfo->EnableForRun, RegisterBit);
        break;

    default:
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvEnableGpe
 *
 * PARAMETERS:  GpeEventInfo            - GPE to enable
 *              WriteToHardware         - Enable now, or just mark data structs
 *                                        (WAKE GPEs should be deferred)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable a GPE based on the GPE type
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvEnableGpe (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    BOOLEAN                 WriteToHardware)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvEnableGpe);


    /* Make sure HW enable masks are updated */

    Status = AcpiEvUpdateGpeEnableMasks (GpeEventInfo, ACPI_GPE_ENABLE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Mark wake-enabled or HW enable, or both */

    switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
    {
    case ACPI_GPE_TYPE_WAKE:

        ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
        break;

    case ACPI_GPE_TYPE_WAKE_RUN:

        ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);

        /*lint -fallthrough */

    case ACPI_GPE_TYPE_RUNTIME:

        ACPI_SET_BIT (GpeEventInfo->Flags, ACPI_GPE_RUN_ENABLED);

        if (WriteToHardware)
        {
            /* Clear the GPE (of stale events), then enable it */

            Status = AcpiHwClearGpe (GpeEventInfo);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }

            /* Enable the requested runtime GPE */

            Status = AcpiHwWriteGpeEnableReg (GpeEventInfo);
        }
        break;

    default:
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvDisableGpe
 *
 * PARAMETERS:  GpeEventInfo            - GPE to disable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable a GPE based on the GPE type
 *
 ******************************************************************************/

ACPI_STATUS
AcpiEvDisableGpe (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvDisableGpe);


    if (!(GpeEventInfo->Flags & ACPI_GPE_ENABLE_MASK))
    {
        return_ACPI_STATUS (AE_OK);
    }

    /* Make sure HW enable masks are updated */

    Status = AcpiEvUpdateGpeEnableMasks (GpeEventInfo, ACPI_GPE_DISABLE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Mark wake-disabled or HW disable, or both */

    switch (GpeEventInfo->Flags & ACPI_GPE_TYPE_MASK)
    {
    case ACPI_GPE_TYPE_WAKE:
        ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);
        break;

    case ACPI_GPE_TYPE_WAKE_RUN:
        ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_WAKE_ENABLED);

        /*lint -fallthrough */

    case ACPI_GPE_TYPE_RUNTIME:

        /* Disable the requested runtime GPE */

        ACPI_CLEAR_BIT (GpeEventInfo->Flags, ACPI_GPE_RUN_ENABLED);

        /*lint -fallthrough */

    default:
        /*
         * Even if we don't know the GPE type, make sure that we always
         * disable it. This can prevent a certain type of GPE flood, where
         * the GPE has no _Lxx/_Exx method, and it cannot be determined
         * whether the GPE is wake, run, or wake/run.
         */
        Status = AcpiHwWriteGpeEnableReg (GpeEventInfo);
        break;
    }

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiEvGetGpeEventInfo
 *
 * PARAMETERS:  GpeDevice           - Device node.  NULL for GPE0/GPE1
 *              GpeNumber           - Raw GPE number
 *
 * RETURN:      A GPE EventInfo struct.  NULL if not a valid GPE
 *
 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
 *              Validates the GpeBlock and the GpeNumber
 *
 *              Should be called only when the GPE lists are semaphore locked
 *              and not subject to change.
 *
 ******************************************************************************/

ACPI_GPE_EVENT_INFO *
AcpiEvGetGpeEventInfo (
    ACPI_HANDLE             GpeDevice,
    UINT32                  GpeNumber)
{
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_GPE_BLOCK_INFO     *GpeBlock;
    ACPI_NATIVE_UINT        i;


    ACPI_FUNCTION_ENTRY ();


    /* A NULL GpeBlock means use the FADT-defined GPE block(s) */

    if (!GpeDevice)
    {
        /* Examine GPE Block 0 and 1 (These blocks are permanent) */

        for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
        {
            GpeBlock = AcpiGbl_GpeFadtBlocks[i];
            if (GpeBlock)
            {
                if ((GpeNumber >= GpeBlock->BlockBaseNumber) &&
                    (GpeNumber < GpeBlock->BlockBaseNumber +
                        (GpeBlock->RegisterCount * 8)))
                {
                    return (&GpeBlock->EventInfo[GpeNumber -
                        GpeBlock->BlockBaseNumber]);
                }
            }
        }

        /* The GpeNumber was not in the range of either FADT GPE block */

        return (NULL);