rsxface.c

acpi tools for linux include acpiexec and acpixtract

    Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    Status = AcpiRsGetPrsMethodData (Node, RetBuffer);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetPossibleResources)


/*******************************************************************************
 *
 * FUNCTION:    AcpiSetCurrentResources
 *
 * PARAMETERS:  DeviceHandle    - Handle to the device object for the
 *                                device we are setting resources
 *              InBuffer        - Pointer to a buffer containing the
 *                                resources to be set for the device
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to set the current resources for a
 *              specific device. The caller must first acquire a handle for
 *              the desired device. The resource data is passed to the routine
 *              the buffer pointed to by the InBuffer variable.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiSetCurrentResources (
    ACPI_HANDLE             DeviceHandle,
    ACPI_BUFFER             *InBuffer)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    ACPI_FUNCTION_TRACE (AcpiSetCurrentResources);


    /* Validate the buffer, don't allow zero length */

    if ((!InBuffer) ||
        (!InBuffer->Pointer) ||
        (!InBuffer->Length))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Validate parameters then dispatch to internal routine */

    Status = AcpiRsValidateParameters (DeviceHandle, InBuffer, &Node);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    Status = AcpiRsSetSrsMethodData (Node, InBuffer);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiSetCurrentResources)


/******************************************************************************
 *
 * FUNCTION:    AcpiResourceToAddress64
 *
 * PARAMETERS:  Resource        - Pointer to a resource
 *              Out             - Pointer to the users's return buffer
 *                                (a struct acpi_resource_address64)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: If the resource is an address16, address32, or address64,
 *              copy it to the address64 return buffer. This saves the
 *              caller from having to duplicate code for different-sized
 *              addresses.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiResourceToAddress64 (
    ACPI_RESOURCE               *Resource,
    ACPI_RESOURCE_ADDRESS64     *Out)
{
    ACPI_RESOURCE_ADDRESS16     *Address16;
    ACPI_RESOURCE_ADDRESS32     *Address32;


    if (!Resource || !Out)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Convert 16 or 32 address descriptor to 64 */

    switch (Resource->Type)
    {
    case ACPI_RESOURCE_TYPE_ADDRESS16:

        Address16 = (ACPI_RESOURCE_ADDRESS16 *) &Resource->Data;
        ACPI_COPY_ADDRESS (Out, Address16);
        break;

    case ACPI_RESOURCE_TYPE_ADDRESS32:

        Address32 = (ACPI_RESOURCE_ADDRESS32 *) &Resource->Data;
        ACPI_COPY_ADDRESS (Out, Address32);
        break;

    case ACPI_RESOURCE_TYPE_ADDRESS64:

        /* Simple copy for 64 bit source */

        ACPI_MEMCPY (Out, &Resource->Data, sizeof (ACPI_RESOURCE_ADDRESS64));
        break;

    default:
        return (AE_BAD_PARAMETER);
    }

    return (AE_OK);
}

ACPI_EXPORT_SYMBOL (AcpiResourceToAddress64)


/*******************************************************************************
 *
 * FUNCTION:    AcpiGetVendorResource
 *
 * PARAMETERS:  DeviceHandle    - Handle for the parent device object
 *              Name            - Method name for the parent resource
 *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
 *              Uuid            - Pointer to the UUID to be matched.
 *                                includes both subtype and 16-byte UUID
 *              RetBuffer       - Where the vendor resource is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk a resource template for the specified evice to find a
 *              vendor-defined resource that matches the supplied UUID and
 *              UUID subtype. Returns a ACPI_RESOURCE of type Vendor.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiGetVendorResource (
    ACPI_HANDLE             DeviceHandle,
    char                    *Name,
    ACPI_VENDOR_UUID        *Uuid,
    ACPI_BUFFER             *RetBuffer)
{
    ACPI_VENDOR_WALK_INFO   Info;
    ACPI_STATUS             Status;


    /* Other parameters are validated by AcpiWalkResources */

    if (!Uuid || !RetBuffer)
    {
        return (AE_BAD_PARAMETER);
    }

    Info.Uuid = Uuid;
    Info.Buffer = RetBuffer;
    Info.Status = AE_NOT_EXIST;

    /* Walk the _CRS or _PRS resource list for this device */

    Status = AcpiWalkResources (DeviceHandle, Name, AcpiRsMatchVendorResource,
                &Info);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    return (Info.Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetVendorResource)


/*******************************************************************************
 *
 * FUNCTION:    AcpiRsMatchVendorResource
 *
 * PARAMETERS:  ACPI_WALK_RESOURCE_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
 *
 ******************************************************************************/

static ACPI_STATUS
AcpiRsMatchVendorResource (
    ACPI_RESOURCE           *Resource,
    void                    *Context)
{
    ACPI_VENDOR_WALK_INFO       *Info = Context;
    ACPI_RESOURCE_VENDOR_TYPED  *Vendor;
    ACPI_BUFFER                 *Buffer;
    ACPI_STATUS                 Status;


    /* Ignore all descriptors except Vendor */

    if (Resource->Type != ACPI_RESOURCE_TYPE_VENDOR)
    {
        return (AE_OK);
    }

    Vendor = &Resource->Data.VendorTyped;

    /*
     * For a valid match, these conditions must hold:
     *
     * 1) Length of descriptor data must be at least as long as a UUID struct
     * 2) The UUID subtypes must match
     * 3) The UUID data must match
     */
    if ((Vendor->ByteLength < (ACPI_UUID_LENGTH + 1)) ||
        (Vendor->UuidSubtype != Info->Uuid->Subtype)  ||
        (ACPI_MEMCMP (Vendor->Uuid, Info->Uuid->Data, ACPI_UUID_LENGTH)))
    {
        return (AE_OK);
    }

    /* Validate/Allocate/Clear caller buffer */

    Buffer = Info->Buffer;
    Status = AcpiUtInitializeBuffer (Buffer, Resource->Length);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Found the correct resource, copy and return it */

    ACPI_MEMCPY (Buffer->Pointer, Resource, Resource->Length);
    Buffer->Length = Resource->Length;

    /* Found the desired descriptor, terminate resource walk */

    Info->Status = AE_OK;
    return (AE_CTRL_TERMINATE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiWalkResources
 *
 * PARAMETERS:  DeviceHandle    - Handle to the device object for the
 *                                device we are querying
 *              Name            - Method name of the resources we want
 *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
 *              UserFunction    - Called for each resource
 *              Context         - Passed to UserFunction
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Retrieves the current or possible resource list for the
 *              specified device. The UserFunction is called once for
 *              each resource in the list.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiWalkResources (
    ACPI_HANDLE                 DeviceHandle,
    char                        *Name,
    ACPI_WALK_RESOURCE_CALLBACK UserFunction,
    void                        *Context)
{
    ACPI_STATUS                 Status;
    ACPI_BUFFER                 Buffer;
    ACPI_RESOURCE               *Resource;
    ACPI_RESOURCE               *ResourceEnd;


    ACPI_FUNCTION_TRACE (AcpiWalkResources);


    /* Parameter validation */

    if (!DeviceHandle || !UserFunction || !Name ||
        (!ACPI_COMPARE_NAME (Name, METHOD_NAME__CRS) &&
         !ACPI_COMPARE_NAME (Name, METHOD_NAME__PRS)))
    {
        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    /* Get the _CRS or _PRS resource list */

    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
    Status = AcpiRsGetMethodData (DeviceHandle, Name, &Buffer);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Buffer now contains the resource list */

    Resource = ACPI_CAST_PTR (ACPI_RESOURCE, Buffer.Pointer);
    ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Buffer.Pointer, Buffer.Length);

    /* Walk the resource list until the EndTag is found (or buffer end) */

    while (Resource < ResourceEnd)
    {
        /* Sanity check the resource */

        if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
        {
            Status = AE_AML_INVALID_RESOURCE_TYPE;
            break;
        }

        /* Invoke the user function, abort on any error returned */

        Status = UserFunction (Resource, Context);
        if (ACPI_FAILURE (Status))
        {
            if (Status == AE_CTRL_TERMINATE)
            {
                /* This is an OK termination by the user function */

                Status = AE_OK;
            }
            break;
        }

        /* EndTag indicates end-of-list */

        if (Resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
        {
            break;
        }

        /* Get the next resource descriptor */

        Resource = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, Resource->Length);
    }

    ACPI_FREE (Buffer.Pointer);
    return_ACPI_STATUS (Status);
}

ACPI_EXPORT_SYMBOL (AcpiWalkResources)