drivers/nble: Introduce basic skeleton

Introduce the basic skeleton for NBLE, which is the Bluetooth LE API
implementation targeting a custom firmware running on Nordic
Semiconductor nRF51 chips.

Change-Id: I1ce69d6ee0205e71f6bd8d256d9233c93d2cde41
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

drivers/nble/conn.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/conn.h>
+
+struct bt_conn *bt_conn_ref(struct bt_conn *conn)
+{
+	return NULL;
+}
+
+void bt_conn_unref(struct bt_conn *conn)
+{
+}
+
+struct bt_conn *bt_conn_lookup_addr_le(const bt_addr_le_t *peer)
+{
+	return NULL;
+}
+
+const bt_addr_le_t *bt_conn_get_dst(const struct bt_conn *conn)
+{
+	return NULL;
+}
+
+int bt_conn_get_info(const struct bt_conn *conn, struct bt_conn_info *info)
+{
+	return -ENOSYS;
+}
+
+int bt_conn_disconnect(struct bt_conn *conn, uint8_t reason)
+{
+	return -ENOSYS;
+}
+
+struct bt_conn *bt_conn_create_le(const bt_addr_le_t *peer,
+				  const struct bt_le_conn_param *param)
+{
+	return NULL;
+}
+
+int bt_conn_security(struct bt_conn *conn, bt_security_t sec)
+{
+	return -ENOSYS;
+}
+
+uint8_t bt_conn_enc_key_size(struct bt_conn *conn)
+{
+	return 0;
+}
+
+void bt_conn_cb_register(struct bt_conn_cb *cb)
+{
+}