/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
/*
 * pylibfdt - Flat Device Tree manipulation in Python
 * Copyright (C) 2017 Google, Inc.
 * Written by Simon Glass <sjg@chromium.org>
 */

%module libfdt

%include <stdint.i>

%{
#define SWIG_FILE_WITH_INIT
#include "libfdt.h"

/*
 * We rename this function here to avoid problems with swig, since we also have
 * a struct called fdt_property. That struct causes swig to create a class in
 * libfdt.py called fdt_property(), which confuses things.
 */
static int _fdt_property(void *fdt, const char *name, const char *val, int len)
{
    return fdt_property(fdt, name, val, len);
}

%}

%pythoncode %{

import struct

# Error codes, corresponding to FDT_ERR_... in libfdt.h
(NOTFOUND,
        EXISTS,
        NOSPACE,
        BADOFFSET,
        BADPATH,
        BADPHANDLE,
        BADSTATE,
        TRUNCATED,
        BADMAGIC,
        BADVERSION,
        BADSTRUCTURE,
        BADLAYOUT,
        INTERNAL,
        BADNCELLS,
        BADVALUE,
        BADOVERLAY,
        NOPHANDLES) = QUIET_ALL = range(1, 18)
# QUIET_ALL can be passed as the 'quiet' parameter to avoid exceptions
# altogether. All # functions passed this value will return an error instead
# of raising an exception.

# Pass this as the 'quiet' parameter to return -ENOTFOUND on NOTFOUND errors,
# instead of raising an exception.
QUIET_NOTFOUND = (NOTFOUND,)


class FdtException(Exception):
    """An exception caused by an error such as one of the codes above"""
    def __init__(self, err):
        self.err = err

    def __str__(self):
        return 'pylibfdt error %d: %s' % (self.err, fdt_strerror(self.err))

def strerror(fdt_err):
    """Get the string for an error number

    Args:
        fdt_err: Error number (-ve)

    Returns:
        String containing the associated error
    """
    return fdt_strerror(fdt_err)

def check_err(val, quiet=()):
    """Raise an error if the return value is -ve

    This is used to check for errors returned by libfdt C functions.

    Args:
        val: Return value from a libfdt function
        quiet: Errors to ignore (empty to raise on all errors)

    Returns:
        val if val >= 0

    Raises
        FdtException if val < 0
    """
    if val < 0:
        if -val not in quiet:
            raise FdtException(val)
    return val

def check_err_null(val, quiet=()):
    """Raise an error if the return value is NULL

    This is used to check for a NULL return value from certain libfdt C
    functions

    Args:
        val: Return value from a libfdt function
        quiet: Errors to ignore (empty to raise on all errors)

    Returns:
        val if val is a list, None if not

    Raises
        FdtException if val indicates an error was reported and the error
        is not in @quiet.
    """
    # Normally a list is returned which contains the data and its length.
    # If we get just an integer error code, it means the function failed.
    if not isinstance(val, list):
        if -val not in quiet:
            raise FdtException(val)
    return val


class Fdt:
    """Device tree class, supporting all operations

    The Fdt object is created is created from a device tree binary file,
    e.g. with something like:

       fdt = Fdt(open("filename.dtb").read())

    Operations can then be performed using the methods in this class. Each
    method xxx(args...) corresponds to a libfdt function fdt_xxx(fdt, args...).

    All methods raise an FdtException if an error occurs. To avoid this
    behaviour a 'quiet' parameter is provided for some functions. This
    defaults to empty, but you can pass a list of errors that you expect.
    If one of these errors occurs, the function will return an error number
    (e.g. -NOTFOUND).
    """
    def __init__(self, data):
        self._fdt = bytearray(data)
        check_err(fdt_check_header(self._fdt));

    def as_bytearray(self):
        """Get the device tree contents as a bytearray

        This can be passed directly to libfdt functions that access a
        const void * for the device tree.

        Returns:
            bytearray containing the device tree
        """
        return bytearray(self._fdt)

    def next_node(self, nodeoffset, depth, quiet=()):
        """Find the next subnode

        Args:
            nodeoffset: Node offset of previous node
            depth: On input, the depth of the node at nodeoffset. On output, the
               depth of the returned node
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The offset of the next node, if any

        Raises:
            FdtException if no more nodes found or other error occurs
        """
        return check_err(fdt_next_node(self._fdt, nodeoffset, depth), quiet)

    def first_subnode(self, nodeoffset, quiet=()):
        """Find the first subnode of a parent node

        Args:
            nodeoffset: Node offset of parent node
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The offset of the first subnode, if any

        Raises:
            FdtException if no subnodes found or other error occurs
        """
        return check_err(fdt_first_subnode(self._fdt, nodeoffset), quiet)

    def next_subnode(self, nodeoffset, quiet=()):
        """Find the next subnode

        Args:
            nodeoffset: Node offset of previous subnode
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The offset of the next subnode, if any

        Raises:
            FdtException if no more subnodes found or other error occurs
        """
        return check_err(fdt_next_subnode(self._fdt, nodeoffset), quiet)

    def magic(self):
        """Return the magic word from the header

        Returns:
            Magic word
        """
        return fdt_magic(self._fdt) & 0xffffffff

    def totalsize(self):
        """Return the total size of the device tree

        Returns:
            Total tree size in bytes
        """
        return check_err(fdt_totalsize(self._fdt))

    def off_dt_struct(self):
        """Return the start of the device-tree struct area

        Returns:
            Start offset of struct area
        """
        return check_err(fdt_off_dt_struct(self._fdt))

    def off_dt_strings(self):
        """Return the start of the device-tree string area

        Returns:
            Start offset of string area
        """
        return check_err(fdt_off_dt_strings(self._fdt))

    def off_mem_rsvmap(self):
        """Return the start of the memory reserve map

        Returns:
            Start offset of memory reserve map
        """
        return check_err(fdt_off_mem_rsvmap(self._fdt))

    def version(self):
        """Return the version of the device tree

        Returns:
            Version number of the device tree
        """
        return check_err(fdt_version(self._fdt))

    def last_comp_version(self):
        """Return the last compatible version of the device tree

        Returns:
            Last compatible version number of the device tree
        """
        return check_err(fdt_last_comp_version(self._fdt))

    def boot_cpuid_phys(self):
        """Return the physical boot CPU ID

        Returns:
            Physical boot CPU ID
        """
        return check_err(fdt_boot_cpuid_phys(self._fdt))

    def size_dt_strings(self):
        """Return the start of the device-tree string area

        Returns:
            Start offset of string area
        """
        return check_err(fdt_size_dt_strings(self._fdt))

    def size_dt_struct(self):
        """Return the start of the device-tree struct area

        Returns:
            Start offset of struct area
        """
        return check_err(fdt_size_dt_struct(self._fdt))

    def num_mem_rsv(self, quiet=()):
        """Return the number of memory reserve-map records

        Returns:
            Number of memory reserve-map records
        """
        return check_err(fdt_num_mem_rsv(self._fdt), quiet)

    def get_mem_rsv(self, index, quiet=()):
        """Return the indexed memory reserve-map record

        Args:
            index: Record to return (0=first)

        Returns:
            Number of memory reserve-map records
        """
        return check_err(fdt_get_mem_rsv(self._fdt, index), quiet)

    def subnode_offset(self, parentoffset, name, quiet=()):
        """Get the offset of a named subnode

        Args:
            parentoffset: Offset of the parent node to check
            name: Name of the required subnode, e.g. 'subnode@1'
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The node offset of the found node, if any

        Raises
            FdtException if there is no node with that name, or other error
        """
        return check_err(fdt_subnode_offset(self._fdt, parentoffset, name),
                         quiet)

    def path_offset(self, path, quiet=()):
        """Get the offset for a given path

        Args:
            path: Path to the required node, e.g. '/node@3/subnode@1'
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Node offset

        Raises
            FdtException if the path is not valid or not found
        """
        return check_err(fdt_path_offset(self._fdt, path), quiet)

    def get_name(self, nodeoffset):
        """Get the name of a node

        Args:
            nodeoffset: Offset of node to check

        Returns:
            Node name

        Raises:
            FdtException on error (e.g. nodeoffset is invalid)
        """
        return check_err_null(fdt_get_name(self._fdt, nodeoffset))[0]

    def first_property_offset(self, nodeoffset, quiet=()):
        """Get the offset of the first property in a node offset

        Args:
            nodeoffset: Offset to the node to check
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Offset of the first property

        Raises
            FdtException if the associated node has no properties, or some
                other error occurred
        """
        return check_err(fdt_first_property_offset(self._fdt, nodeoffset),
                         quiet)

    def next_property_offset(self, prop_offset, quiet=()):
        """Get the next property in a node

        Args:
            prop_offset: Offset of the previous property
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Offset of the next property

        Raises:
            FdtException if the associated node has no more properties, or
                some other error occurred
        """
        return check_err(fdt_next_property_offset(self._fdt, prop_offset),
                         quiet)

    def get_property_by_offset(self, prop_offset, quiet=()):
        """Obtains a property that can be examined

        Args:
            prop_offset: Offset of property (e.g. from first_property_offset())
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Property object, or None if not found

        Raises:
            FdtException on error (e.g. invalid prop_offset or device
            tree format)
        """
        pdata = check_err_null(
                fdt_get_property_by_offset(self._fdt, prop_offset), quiet)
        if isinstance(pdata, (int)):
            return pdata
        return Property(pdata[0], pdata[1])

    def get_property(self, nodeoffset, prop_name, quiet=()):
        """Obtains a property by name

        Args:
            nodeoffset: Offset to the node to check
            prop_name: Name of property to get
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Property object, or None if not found

        Raises:
            FdtException on error (e.g. invalid prop_offset or device
            tree format)
        """
        pdata = check_err_null(
                fdt_get_property(self._fdt, nodeoffset, prop_name), quiet)
        if isinstance(pdata, (int)):
            return pdata
        return Property(pdata[0], pdata[1])

    @staticmethod
    def create_empty_tree(size, quiet=()):
        """Create an empty device tree ready for use

        Args:
            size: Size of device tree in bytes

        Returns:
            Fdt object containing the device tree
        """
        data = bytearray(size)
        err = check_err(fdt_create_empty_tree(data, size), quiet)
        if err:
            return err
        return Fdt(data)

    def open_into(self, size, quiet=()):
        """Move the device tree into a larger or smaller space

        This creates a new device tree of size @size and moves the existing
        device tree contents over to that. It can be used to create more space
        in a device tree.

        Args:
            size: Required new size of device tree in bytes
        """
        fdt = bytearray(size)
        fdt[:len(self._fdt)] = self._fdt
        err = check_err(fdt_open_into(self._fdt, fdt, size), quiet)
        if err:
            return err
        self._fdt = fdt

    def pack(self, quiet=()):
        """Pack the device tree to remove unused space

        This adjusts the tree in place.

        Args:
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if any error occurs
        """
        err = check_err(fdt_pack(self._fdt), quiet)
        if err:
            return err
        del self._fdt[self.totalsize():]
        return err

    def getprop(self, nodeoffset, prop_name, quiet=()):
        """Get a property from a node

        Args:
            nodeoffset: Node offset containing property to get
            prop_name: Name of property to get
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Value of property as a string, or -ve error number

        Raises:
            FdtError if any error occurs (e.g. the property is not found)
        """
        pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name),
                               quiet)
        if isinstance(pdata, (int)):
            return pdata
        return str(pdata[0])

    def getprop_obj(self, nodeoffset, prop_name, quiet=()):
        """Get a property from a node as a Property object

        Args:
            nodeoffset: Node offset containing property to get
            prop_name: Name of property to get
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Property object, or None if not found

        Raises:
            FdtError if any error occurs (e.g. the property is not found)
        """
        pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name),
                               quiet)
        if isinstance(pdata, (int)):
            return None
        return Property(prop_name, bytearray(pdata[0]))

    def get_phandle(self, nodeoffset):
        """Get the phandle of a node

        Args:
            nodeoffset: Node offset to check

        Returns:
            phandle of node, or 0 if the node has no phandle or another error
            occurs
        """
        return fdt_get_phandle(self._fdt, nodeoffset)

    def parent_offset(self, nodeoffset, quiet=()):
        """Get the offset of a node's parent

        Args:
            nodeoffset: Node offset to check
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The offset of the parent node, if any

        Raises:
            FdtException if no parent found or other error occurs
        """
        return check_err(fdt_parent_offset(self._fdt, nodeoffset), quiet)

    def set_name(self, nodeoffset, name, quiet=()):
        """Set the name of a node

        Args:
            nodeoffset: Node offset of node to update
            name: New node name

        Returns:
            Error code, or 0 if OK

        Raises:
            FdtException if no parent found or other error occurs
        """
        return check_err(fdt_set_name(self._fdt, nodeoffset, name), quiet)

    def setprop(self, nodeoffset, prop_name, val, quiet=()):
        """Set the value of a property

        Args:
            nodeoffset: Node offset containing the property to create/update
            prop_name: Name of property
            val: Value to write (string or bytearray)
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Error code, or 0 if OK

        Raises:
            FdtException if no parent found or other error occurs
        """
        return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name, val,
                                     len(val)), quiet)

    def setprop_u32(self, nodeoffset, prop_name, val, quiet=()):
        """Set the value of a property

        Args:
            nodeoffset: Node offset containing the property to create/update
            prop_name: Name of property
            val: Value to write (integer)
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Error code, or 0 if OK

        Raises:
            FdtException if no parent found or other error occurs
        """
        return check_err(fdt_setprop_u32(self._fdt, nodeoffset, prop_name, val),
                         quiet)

    def setprop_u64(self, nodeoffset, prop_name, val, quiet=()):
        """Set the value of a property

        Args:
            nodeoffset: Node offset containing the property to create/update
            prop_name: Name of property
            val: Value to write (integer)
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Error code, or 0 if OK

        Raises:
            FdtException if no parent found or other error occurs
        """
        return check_err(fdt_setprop_u64(self._fdt, nodeoffset, prop_name, val),
                         quiet)

    def setprop_str(self, nodeoffset, prop_name, val, quiet=()):
        """Set the string value of a property

        The property is set to the string, with a nul terminator added

        Args:
            nodeoffset: Node offset containing the property to create/update
            prop_name: Name of property
            val: Value to write (string without nul terminator)
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            Error code, or 0 if OK

        Raises:
            FdtException if no parent found or other error occurs
        """
        val += '\0'
        return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name,
                                     val, len(val)), quiet)

    def delprop(self, nodeoffset, prop_name):
        """Delete a property from a node

        Args:
            nodeoffset: Node offset containing property to delete
            prop_name: Name of property to delete

        Raises:
            FdtError if the property does not exist, or another error occurs
        """
        return check_err(fdt_delprop(self._fdt, nodeoffset, prop_name))

    def node_offset_by_phandle(self, phandle, quiet=()):
        """Get the offset of a node with the given phandle

        Args:
            phandle: Phandle to search for
            quiet: Errors to ignore (empty to raise on all errors)

        Returns:
            The offset of node with that phandle, if any

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_node_offset_by_phandle(self._fdt, phandle), quiet)

    def del_node(self, nodeoffset):
        """Delete a node

        Args:
            nodeoffset: Node offset containing property to delete

        Raises:
            FdtError if the node does not exist, or another error occurs
        """
        return check_err(fdt_del_node(self._fdt, nodeoffset))


class Property(bytearray):
    """Holds a device tree property name and value.

    This holds a copy of a property taken from the device tree. It does not
    reference the device tree, so if anything changes in the device tree,
    a Property object will remain valid.

    Properties:
        name: Property name
        value: Property value as a bytearray
    """
    def __init__(self, name, value):
        bytearray.__init__(self, value)
        self.name = name

    def as_cell(self, fmt):
        return struct.unpack('>' + fmt, self)[0]

    def as_uint32(self):
        return self.as_cell('L')

    def as_int32(self):
        return self.as_cell('l')

    def as_uint64(self):
        return self.as_cell('Q')

    def as_int64(self):
        return self.as_cell('q')

    def as_str(self):
        return self[:-1]


class FdtSw(object):
    """Software interface to create a device tree from scratch

    The methods in this class work by adding to an existing 'partial' device
    tree buffer of a fixed size created by instantiating this class. When the
    tree is complete, call finish() to complete the device tree so that it can
    be used.

    Similarly with nodes, a new node is started with begin_node() and finished
    with end_node().

    The context manager functions can be used to make this a bit easier:

    # First create the device tree with a node and property:
    with FdtSw(small_size) as sw:
        with sw.AddNode('node'):
            sw.property_u32('reg', 2)
    fdt = sw.AsFdt()

    # Now we can use it as a real device tree
    fdt.setprop_u32(0, 'reg', 3)
    """
    def __init__(self, size, quiet=()):
        fdtrw = bytearray(size)
        err = check_err(fdt_create(fdtrw, size))
        if err:
            return err
        self._fdtrw = fdtrw

    def __enter__(self):
        """Contact manager to use to create a device tree via software"""
        return self

    def __exit__(self, type, value, traceback):
        check_err(fdt_finish(self._fdtrw))

    def AsFdt(self):
        """Convert a FdtSw into an Fdt so it can be accessed as normal

        Note that finish() must be called before this function will work. If
        you are using the context manager (see 'with' code in the FdtSw class
        comment) then this will happen automatically.

        Returns:
            Fdt object allowing access to the newly created device tree
        """
        return Fdt(self._fdtrw)

    def resize(self, size, quiet=()):
        """Resize the buffer to accommodate a larger tree

        Args:
            size: New size of tree
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        fdt = bytearray(size)
        fdt[:len(self._fdtrw)] = self._fdtrw
        err = check_err(fdt_resize(self._fdtrw, fdt, size), quiet)
        if err:
            return err
        self._fdtrw = fdt

    def add_reservemap_entry(self, addr, size, quiet=()):
        """Add a new memory reserve map entry

        Once finished adding, you must call finish_reservemap().

        Args:
            addr: 64-bit start address
            size: 64-bit size
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_add_reservemap_entry(self._fdtrw, addr, size),
                         quiet)

    def finish_reservemap(self, quiet=()):
        """Indicate that there are no more reserve map entries to add

        Args:
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_finish_reservemap(self._fdtrw), quiet)

    def begin_node(self, name, quiet=()):
        """Begin a new node

        Use this before adding properties to the node. Then call end_node() to
        finish it. You can also use the context manager as shown in the FdtSw
        class comment.

        Args:
            name: Name of node to begin
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_begin_node(self._fdtrw, name), quiet)

    def property_string(self, name, string, quiet=()):
        """Add a property with a string value

        The string will be nul-terminated when written to the device tree

        Args:
            name: Name of property to add
            string: String value of property
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_property_string(self._fdtrw, name, string), quiet)

    def property_u32(self, name, val, quiet=()):
        """Add a property with a 32-bit value

        Write a single-cell value to the device tree

        Args:
            name: Name of property to add
            val: Value of property
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_property_u32(self._fdtrw, name, val), quiet)

    def property_u64(self, name, val, quiet=()):
        """Add a property with a 64-bit value

        Write a double-cell value to the device tree in big-endian format

        Args:
            name: Name of property to add
            val: Value of property
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_property_u64(self._fdtrw, name, val), quiet)

    def property_cell(self, name, val, quiet=()):
        """Add a property with a single-cell value

        Write a single-cell value to the device tree

        Args:
            name: Name of property to add
            val: Value of property
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_property_cell(self._fdtrw, name, val), quiet)

    def property(self, name, val, quiet=()):
        """Add a property

        Write a new property with the given value to the device tree. The value
        is taken as is and is not nul-terminated

        Args:
            name: Name of property to add
            val: Value of property
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(_fdt_property(self._fdtrw, name, val, len(val)), quiet)

    def end_node(self, quiet=()):
        """End a node

        Use this after adding properties to a node to close it off. You can also
        use the context manager as shown in the FdtSw class comment.

        Args:
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_end_node(self._fdtrw), quiet)

    def finish(self, quiet=()):
        """Finish writing the device tree

        This closes off the device tree ready for use

        Args:
            quiet: Errors to ignore (empty to raise on all errors)

        Raises:
            FdtException if no node found or other error occurs
        """
        return check_err(fdt_finish(self._fdtrw), quiet)

    def AddNode(self, name):
        """Create a new context for adding a node

        When used in a 'with' clause this starts a new node and finishes it
        afterward.

        Args:
            name: Name of node to add
        """
        return NodeAdder(self._fdtrw, name)


class NodeAdder():
    """Class to provide a node context

    This allows you to add nodes in a more natural way:

        with fdtsw.AddNode('name'):
            fdtsw.property_string('test', 'value')

    The node is automatically completed with a call to end_node() when the
    context exits.
    """
    def __init__(self, fdt, name):
        self._fdt = fdt
        self._name = name

    def __enter__(self):
        check_err(fdt_begin_node(self._fdt, self._name))

    def __exit__(self, type, value, traceback):
        check_err(fdt_end_node(self._fdt))
%}

%rename(fdt_property) fdt_property_func;

typedef int fdt32_t;

%include "libfdt/fdt.h"

%include "typemaps.i"

/* Most functions don't change the device tree, so use a const void * */
%typemap(in) (const void *)(const void *fdt) {
	if (!PyByteArray_Check($input)) {
		SWIG_exception_fail(SWIG_TypeError, "in method '" "$symname"
			"', argument " "$argnum"" of type '" "$type""'");
	}
	$1 = (void *)PyByteArray_AsString($input);
        fdt = $1;
        fdt = fdt; /* avoid unused variable warning */
}

/* Some functions do change the device tree, so use void * */
%typemap(in) (void *)(const void *fdt) {
	if (!PyByteArray_Check($input)) {
		SWIG_exception_fail(SWIG_TypeError, "in method '" "$symname"
			"', argument " "$argnum"" of type '" "$type""'");
	}
	$1 = PyByteArray_AsString($input);
        fdt = $1;
        fdt = fdt; /* avoid unused variable warning */
}

/* typemap used for fdt_get_property_by_offset() */
%typemap(out) (struct fdt_property *) {
	PyObject *buff;

	if ($1) {
		resultobj = PyString_FromString(
			fdt_string(fdt1, fdt32_to_cpu($1->nameoff)));
		buff = PyByteArray_FromStringAndSize(
			(const char *)($1 + 1), fdt32_to_cpu($1->len));
		resultobj = SWIG_Python_AppendOutput(resultobj, buff);
	}
}

%apply int *OUTPUT { int *lenp };

/* typemap used for fdt_getprop() */
%typemap(out) (const void *) {
	if (!$1)
		$result = Py_None;
	else
		$result = Py_BuildValue("s#", $1, *arg4);
}

/* typemap used for fdt_setprop() */
%typemap(in) (const void *val) {
    $1 = PyString_AsString($input);   /* char *str */
}

/* typemap used for fdt_add_reservemap_entry() */
%typemap(in) uint64_t {
   $1 = PyLong_AsUnsignedLong($input);
}

/* typemaps used for fdt_next_node() */
%typemap(in, numinputs=1) int *depth (int depth) {
   depth = (int) PyInt_AsLong($input);
   $1 = &depth;
}

%typemap(argout) int *depth {
        PyObject *val = Py_BuildValue("i", *arg$argnum);
        resultobj = SWIG_Python_AppendOutput(resultobj, val);
}

%apply int *depth { int *depth };

/* typemaps for fdt_get_mem_rsv */
%typemap(in, numinputs=0) uint64_t * (uint64_t temp) {
   $1 = &temp;
}

%typemap(argout) uint64_t * {
        PyObject *val = PyLong_FromUnsignedLong(*arg$argnum);
        if (!result) {
           if (PyTuple_GET_SIZE(resultobj) == 0)
              resultobj = val;
           else
              resultobj = SWIG_Python_AppendOutput(resultobj, val);
        }
}

/* We have both struct fdt_property and a function fdt_property() */
%warnfilter(302) fdt_property;

/* These are macros in the header so have to be redefined here */
int fdt_magic(const void *fdt);
int fdt_totalsize(const void *fdt);
int fdt_off_dt_struct(const void *fdt);
int fdt_off_dt_strings(const void *fdt);
int fdt_off_mem_rsvmap(const void *fdt);
int fdt_version(const void *fdt);
int fdt_last_comp_version(const void *fdt);
int fdt_boot_cpuid_phys(const void *fdt);
int fdt_size_dt_strings(const void *fdt);
int fdt_size_dt_struct(const void *fdt);
int fdt_property_string(void *fdt, const char *name, const char *val);
int fdt_property_cell(void *fdt, const char *name, uint32_t val);

/*
 * This function has a stub since the name fdt_property is used for both a
  * function and a struct, which confuses SWIG.
 */
int _fdt_property(void *fdt, const char *name, const char *val, int len);

%include <../libfdt/libfdt.h>