1 files changed, 124 insertions, 0 deletions
diff --git a/circuitpython/shared-bindings/usb_midi/PortIn.c b/circuitpython/shared-bindings/usb_midi/PortIn.c
new file mode 100644
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--- /dev/null
+++ b/circuitpython/shared-bindings/usb_midi/PortIn.c
@@ -0,0 +1,124 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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 "shared-bindings/usb_midi/PortIn.h"
+#include "shared-bindings/util.h"
+
+#include "py/ioctl.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+#include "supervisor/shared/translate.h"
+
+//| class PortIn:
+//|     """Receives midi commands over USB"""
+//|
+//|     def __init__(self) -> None:
+//|         """You cannot create an instance of `usb_midi.PortIn`.
+//|
+//|         PortIn objects are constructed for every corresponding entry in the USB
+//|         descriptor and added to the ``usb_midi.ports`` tuple."""
+//|         ...
+//|
+
+// These are standard stream methods. Code is in py/stream.c.
+//
+//|     def read(self, nbytes: Optional[int] = None) -> Optional[bytes]:
+//|         """Read characters.  If ``nbytes`` is specified then read at most that many
+//|         bytes. Otherwise, read everything that arrives until the connection
+//|         times out. Providing the number of bytes expected is highly recommended
+//|         because it will be faster.
+//|
+//|         :return: Data read
+//|         :rtype: bytes or None"""
+//|         ...
+//|
+//|     def readinto(self, buf: WriteableBuffer, nbytes: Optional[int] = None) -> Optional[bytes]:
+//|         """Read bytes into the ``buf``.  If ``nbytes`` is specified then read at most
+//|         that many bytes.  Otherwise, read at most ``len(buf)`` bytes.
+//|
+//|         :return: number of bytes read and stored into ``buf``
+//|         :rtype: bytes or None"""
+//|         ...
+//|
+
+// These three methods are used by the shared stream methods.
+STATIC mp_uint_t usb_midi_portin_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
+    usb_midi_portin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    byte *buf = buf_in;
+
+    // make sure we want at least 1 char
+    if (size == 0) {
+        return 0;
+    }
+
+    return common_hal_usb_midi_portin_read(self, buf, size, errcode);
+}
+
+STATIC mp_uint_t usb_midi_portin_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
+    usb_midi_portin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_uint_t ret;
+    if (request == MP_IOCTL_POLL) {
+        mp_uint_t flags = arg;
+        ret = 0;
+        if ((flags & MP_IOCTL_POLL_RD) && common_hal_usb_midi_portin_bytes_available(self) > 0) {
+            ret |= MP_IOCTL_POLL_RD;
+        }
+    } else {
+        *errcode = MP_EINVAL;
+        ret = MP_STREAM_ERROR;
+    }
+    return ret;
+}
+
+STATIC const mp_rom_map_elem_t usb_midi_portin_locals_dict_table[] = {
+    // Standard stream methods.
+    { MP_OBJ_NEW_QSTR(MP_QSTR_read),     MP_ROM_PTR(&mp_stream_read_obj) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(usb_midi_portin_locals_dict, usb_midi_portin_locals_dict_table);
+
+STATIC const mp_stream_p_t usb_midi_portin_stream_p = {
+    MP_PROTO_IMPLEMENT(MP_QSTR_protocol_stream)
+    .read = usb_midi_portin_read,
+    .write = NULL,
+    .ioctl = usb_midi_portin_ioctl,
+    .is_text = false,
+};
+
+const mp_obj_type_t usb_midi_portin_type = {
+    { &mp_type_type },
+    .flags = MP_TYPE_FLAG_EXTENDED,
+    .name = MP_QSTR_PortIn,
+    .locals_dict = (mp_obj_dict_t *)&usb_midi_portin_locals_dict,
+    MP_TYPE_EXTENDED_FIELDS(
+        .getiter = mp_identity_getiter,
+        .iternext = mp_stream_unbuffered_iter,
+        .protocol = &usb_midi_portin_stream_p,
+        ),
+};