evxface.c

来自「acpi tools for linux include acpiexec a」· C语言 代码 · 共 966 行 · 第 1/2 页

            ObjDesc->CommonNotify.SystemNotify = NotifyObj;
        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)
        {
            ObjDesc->CommonNotify.DeviceNotify = NotifyObj;
        }

        if (HandlerType == ACPI_ALL_NOTIFY)
        {
            /* Extra ref if installed in both */

            AcpiUtAddReference (NotifyObj);
        }
    }


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiInstallNotifyHandler)


/*******************************************************************************
 *
 * FUNCTION:    AcpiRemoveNotifyHandler
 *
 * PARAMETERS:  Device          - The device for which notifies will be handled
 *              HandlerType     - The type of handler:
 *                                  ACPI_SYSTEM_NOTIFY: SystemHandler (00-7f)
 *                                  ACPI_DEVICE_NOTIFY: DriverHandler (80-ff)
 *                                  ACPI_ALL_NOTIFY:  both system and device
 *              Handler         - Address of the handler
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a handler for notifies on an ACPI device
 *
 ******************************************************************************/

ACPI_STATUS
AcpiRemoveNotifyHandler (
    ACPI_HANDLE             Device,
    UINT32                  HandlerType,
    ACPI_NOTIFY_HANDLER     Handler)
{
    ACPI_OPERAND_OBJECT     *NotifyObj;
    ACPI_OPERAND_OBJECT     *ObjDesc;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (AcpiRemoveNotifyHandler);


    /* Parameter validation */

    if ((!Device)  ||
        (!Handler) ||
        (HandlerType > ACPI_MAX_NOTIFY_HANDLER_TYPE))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Convert and validate the device handle */

    Node = AcpiNsMapHandleToNode (Device);
    if (!Node)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Root Object */

    if (Device == ACPI_ROOT_OBJECT)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
            "Removing notify handler for namespace root object\n"));

        if (((HandlerType & ACPI_SYSTEM_NOTIFY) &&
              !AcpiGbl_SystemNotify.Handler)        ||
            ((HandlerType & ACPI_DEVICE_NOTIFY) &&
              !AcpiGbl_DeviceNotify.Handler))
        {
            Status = AE_NOT_EXIST;
            goto UnlockAndExit;
        }

        if (HandlerType & ACPI_SYSTEM_NOTIFY)
        {
            AcpiGbl_SystemNotify.Node    = NULL;
            AcpiGbl_SystemNotify.Handler = NULL;
            AcpiGbl_SystemNotify.Context = NULL;
        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)
        {
            AcpiGbl_DeviceNotify.Node    = NULL;
            AcpiGbl_DeviceNotify.Handler = NULL;
            AcpiGbl_DeviceNotify.Context = NULL;
        }
    }

    /* All Other Objects */

    else
    {
        /* Notifies allowed on this object? */

        if (!AcpiEvIsNotifyObject (Node))
        {
            Status = AE_TYPE;
            goto UnlockAndExit;
        }

        /* Check for an existing internal object */

        ObjDesc = AcpiNsGetAttachedObject (Node);
        if (!ObjDesc)
        {
            Status = AE_NOT_EXIST;
            goto UnlockAndExit;
        }

        /* Object exists - make sure there's an existing handler */

        if (HandlerType & ACPI_SYSTEM_NOTIFY)
        {
            NotifyObj = ObjDesc->CommonNotify.SystemNotify;
            if (!NotifyObj)
            {
                Status = AE_NOT_EXIST;
                goto UnlockAndExit;
            }

            if (NotifyObj->Notify.Handler != Handler)
            {
                Status = AE_BAD_PARAMETER;
                goto UnlockAndExit;
            }

            /* Remove the handler */

            ObjDesc->CommonNotify.SystemNotify = NULL;
            AcpiUtRemoveReference (NotifyObj);
        }

        if (HandlerType & ACPI_DEVICE_NOTIFY)
        {
            NotifyObj = ObjDesc->CommonNotify.DeviceNotify;
            if (!NotifyObj)
            {
                Status = AE_NOT_EXIST;
                goto UnlockAndExit;
            }

            if (NotifyObj->Notify.Handler != Handler)
            {
                Status = AE_BAD_PARAMETER;
                goto UnlockAndExit;
            }

            /* Remove the handler */

            ObjDesc->CommonNotify.DeviceNotify = NULL;
            AcpiUtRemoveReference (NotifyObj);
        }
    }


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiRemoveNotifyHandler)


/*******************************************************************************
 *
 * FUNCTION:    AcpiInstallGpeHandler
 *
 * PARAMETERS:  GpeDevice       - Namespace node for the GPE (NULL for FADT
 *                                defined GPEs)
 *              GpeNumber       - The GPE number within the GPE block
 *              Type            - Whether this GPE should be treated as an
 *                                edge- or level-triggered interrupt.
 *              Address         - Address of the handler
 *              Context         - Value passed to the handler on each GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for a General Purpose Event.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiInstallGpeHandler (
    ACPI_HANDLE             GpeDevice,
    UINT32                  GpeNumber,
    UINT32                  Type,
    ACPI_EVENT_HANDLER      Address,
    void                    *Context)
{
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_HANDLER_INFO       *Handler;
    ACPI_STATUS             Status;
    ACPI_CPU_FLAGS          Flags;


    ACPI_FUNCTION_TRACE (AcpiInstallGpeHandler);


    /* Parameter validation */

    if ((!Address) || (Type > ACPI_GPE_XRUPT_TYPE_MASK))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
    if (!GpeEventInfo)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Make sure that there isn't a handler there already */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == ACPI_GPE_DISPATCH_HANDLER)
    {
        Status = AE_ALREADY_EXISTS;
        goto UnlockAndExit;
    }

    /* Allocate and init handler object */

    Handler = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_HANDLER_INFO));
    if (!Handler)
    {
        Status = AE_NO_MEMORY;
        goto UnlockAndExit;
    }

    Handler->Address    = Address;
    Handler->Context    = Context;
    Handler->MethodNode = GpeEventInfo->Dispatch.MethodNode;

    /* Disable the GPE before installing the handler */

    Status = AcpiEvDisableGpe (GpeEventInfo);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    /* Install the handler */

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
    GpeEventInfo->Dispatch.Handler = Handler;

    /* Setup up dispatch flags to indicate handler (vs. method) */

    GpeEventInfo->Flags &= ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);  /* Clear bits */
    GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_HANDLER);

    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiInstallGpeHandler)


/*******************************************************************************
 *
 * FUNCTION:    AcpiRemoveGpeHandler
 *
 * PARAMETERS:  GpeDevice       - Namespace node for the GPE (NULL for FADT
 *                                defined GPEs)
 *              GpeNumber       - The event to remove a handler
 *              Address         - Address of the handler
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a handler for a General Purpose AcpiEvent.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiRemoveGpeHandler (
    ACPI_HANDLE             GpeDevice,
    UINT32                  GpeNumber,
    ACPI_EVENT_HANDLER      Address)
{
    ACPI_GPE_EVENT_INFO     *GpeEventInfo;
    ACPI_HANDLER_INFO       *Handler;
    ACPI_STATUS             Status;
    ACPI_CPU_FLAGS          Flags;


    ACPI_FUNCTION_TRACE (AcpiRemoveGpeHandler);


    /* Parameter validation */

    if (!Address)
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Ensure that we have a valid GPE number */

    GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
    if (!GpeEventInfo)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Make sure that a handler is indeed installed */

    if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) != ACPI_GPE_DISPATCH_HANDLER)
    {
        Status = AE_NOT_EXIST;
        goto UnlockAndExit;
    }

    /* Make sure that the installed handler is the same */

    if (GpeEventInfo->Dispatch.Handler->Address != Address)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Disable the GPE before removing the handler */

    Status = AcpiEvDisableGpe (GpeEventInfo);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    /* Remove the handler */

    Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
    Handler = GpeEventInfo->Dispatch.Handler;

    /* Restore Method node (if any), set dispatch flags */

    GpeEventInfo->Dispatch.MethodNode = Handler->MethodNode;
    GpeEventInfo->Flags &= ~ACPI_GPE_DISPATCH_MASK;  /* Clear bits */
    if (Handler->MethodNode)
    {
        GpeEventInfo->Flags |= ACPI_GPE_DISPATCH_METHOD;
    }
    AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);

    /* Now we can free the handler object */

    ACPI_FREE (Handler);


UnlockAndExit:
    (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiRemoveGpeHandler)


/*******************************************************************************
 *
 * FUNCTION:    AcpiAcquireGlobalLock
 *
 * PARAMETERS:  Timeout         - How long the caller is willing to wait
 *              Handle          - Where the handle to the lock is returned
 *                                (if acquired)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire the ACPI Global Lock
 *
 * Note: Allows callers with the same thread ID to acquire the global lock
 * multiple times. In other words, externally, the behavior of the global lock
 * is identical to an AML mutex. On the first acquire, a new handle is
 * returned. On any subsequent calls to acquire by the same thread, the same
 * handle is returned.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiAcquireGlobalLock (
    UINT16                  Timeout,
    UINT32                  *Handle)
{
    ACPI_STATUS             Status;


    if (!Handle)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Must lock interpreter to prevent race conditions */

    AcpiExEnterInterpreter ();

    Status = AcpiExAcquireMutexObject (Timeout,
                AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());

    if (ACPI_SUCCESS (Status))
    {
        /* Return the global lock handle (updated in AcpiEvAcquireGlobalLock) */

        *Handle = AcpiGbl_GlobalLockHandle;
    }

    AcpiExExitInterpreter ();
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiAcquireGlobalLock)


/*******************************************************************************
 *
 * FUNCTION:    AcpiReleaseGlobalLock
 *
 * PARAMETERS:  Handle      - Returned from AcpiAcquireGlobalLock
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiReleaseGlobalLock (
    UINT32                  Handle)
{
    ACPI_STATUS             Status;


    if (!Handle || (Handle != AcpiGbl_GlobalLockHandle))
    {
        return (AE_NOT_ACQUIRED);
    }

    Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiReleaseGlobalLock)