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diff --git a/circuitpython/shared-bindings/zlib/__init__.c b/circuitpython/shared-bindings/zlib/__init__.c
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+++ b/circuitpython/shared-bindings/zlib/__init__.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Mark Komus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <assert.h>
+#include <string.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+#include "py/mperrno.h"
+#include "py/builtin.h"
+#include "py/objtuple.h"
+#include "py/binary.h"
+#include "py/parsenum.h"
+
+#include "shared-bindings/zlib/__init__.h"
+
+#include "supervisor/shared/translate.h"
+
+//| """zlib decompression functionality
+//|
+//| The `zlib` module allows limited functionality similar to the CPython zlib library.
+//| This module allows to decompress binary data compressed with DEFLATE algorithm
+//| (commonly used in zlib library and gzip archiver). Compression is not yet implemented."""
+//|
+
+//| def zlib_decompress(data: bytes, wbits: Optional[int] = 0, bufsize: Optional[int] = 0) -> bytes:
+//|     """Return decompressed *data* as bytes. *wbits* is DEFLATE dictionary window
+//|     size used during compression (8-15, the dictionary size is power of 2 of
+//|     that value). Additionally, if value is positive, *data* is assumed to be
+//|     zlib stream (with zlib header). Otherwise, if it's negative, it's assumed
+//|     to be raw DEFLATE stream.
+//|
+//|     The wbits parameter controls the size of the history buffer (or “window size”), and what header
+//|     and trailer format is expected.
+//|
+//|     Common wbits values:
+//|
+//|     * To decompress deflate format, use wbits = -15
+//|     * To decompress zlib format, use wbits = 15
+//|     * To decompress gzip format, use wbits = 31
+//|
+//|     :param bytes data: data to be decompressed
+//|     :param int wbits: DEFLATE dictionary window size used during compression. See above.
+//|     :param int bufsize: ignored for compatibility with CPython only
+//|     """
+//|     ...
+//|
+STATIC mp_obj_t zlib_decompress(size_t n_args, const mp_obj_t *args) {
+    bool is_zlib = true;
+    if (n_args > 1 && MP_OBJ_SMALL_INT_VALUE(args[1]) < 0) {
+        is_zlib = false;
+    }
+
+    return common_hal_zlib_decompress(args[0], is_zlib);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(zlib_decompress_obj, 1, 3, zlib_decompress);
+
+STATIC const mp_rom_map_elem_t zlib_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_zlib) },
+    { MP_ROM_QSTR(MP_QSTR_decompress), MP_ROM_PTR(&zlib_decompress_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(zlib_globals, zlib_globals_table);
+
+const mp_obj_module_t zlib_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&zlib_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_zlib, zlib_module, CIRCUITPY_ZLIB);