Bluetooth: L2CAP: Add initial public API

This split L2CAP API so that server API is available to applications
while the rest of the API is keep internal to the stack.

Change-Id: I031926ff906ce100684fba0947b2e9eb2c8fcaeb
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

include/bluetooth/l2cap.h

@@ -0,0 +1,104 @@
+/** @file
+ *  @brief Bluetooth L2CAP handling
+ */
+
+/*
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1) Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2) Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3) Neither the name of Intel Corporation nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __BT_L2CAP_H
+#define __BT_L2CAP_H
+
+#if defined(CONFIG_BLUETOOTH_CENTRAL) || defined(CONFIG_BLUETOOTH_PERIPHERAL)
+#include <bluetooth/conn.h>
+
+/** @brief L2CAP Endpoint structure. */
+struct bt_l2cap_endpoint {
+	/** Endpoint CID */
+	uint16_t		cid;
+	/** Endpoint Maximum PDU payload Size */
+	uint16_t		mps;
+	/** Endpoint Maximum Transmission Unit */
+	uint16_t		mtu;
+	/** Endpoint credits */
+	uint16_t		credits;
+};
+
+/** @brief L2CAP Channel structure. */
+struct bt_l2cap_chan {
+	/** Channel connection reference */
+	struct bt_conn		*conn;
+
+	/** Channel operations reference */
+	struct bt_l2cap_chan_ops *ops;
+
+	/** Channel Transmission Endpoint */
+	struct bt_l2cap_endpoint tx;
+	/** Channel Receiving Endpoint */
+	struct bt_l2cap_endpoint rx;
+
+	struct bt_l2cap_chan	*_next;
+};
+
+/** @brief L2CAP Channel operations structure. */
+struct bt_l2cap_chan_ops {
+	/** Channel connected callback */
+	void			(*connected)(struct bt_l2cap_chan *chan);
+	/** Channel disconnected callback */
+	void			(*disconnected)(struct bt_l2cap_chan *chan);
+	/** Channel encrypt_change callback */
+	void			(*encrypt_change)(struct bt_l2cap_chan *chan);
+
+	/** Channel recv callback */
+	void			(*recv)(struct bt_l2cap_chan *chan,
+					struct bt_buf *buf);
+};
+
+/** @brief L2CAP Server structure. */
+struct bt_l2cap_server {
+	/** Server PSM */
+	uint16_t		psm;
+
+	/** Server accept callack */
+	int (*accept)(struct bt_conn *conn, struct bt_l2cap_chan **chan);
+
+	struct bt_l2cap_server	*_next;
+};
+
+/** @brief Register attribute database.
+ *
+ *  Register L2CAP server for a PSM.
+ *
+ *  @param server Server structure.
+ *
+ * @return 0 in case of success or negative value in case of error.
+ */
+int bt_l2cap_server_register(struct bt_l2cap_server *server);
+
+#endif /* CONFIG_BLUETOOTH_CENTRAL || CONFIG_BLUETOOTH_PERIPHERAL */
+#endif /* __BT_L2CAP_H */

net/bluetooth/att.c

@@ -35,7 +35,7 @@
 
 #include "hci_core.h"
 #include "conn_internal.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "smp.h"
 #include "att.h"
 #include "gatt_internal.h"

net/bluetooth/conn.c

@@ -33,7 +33,7 @@
 
 #include "hci_core.h"
 #include "conn_internal.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "keys.h"
 #include "smp.h"
 

net/bluetooth/gatt.c

@@ -35,7 +35,7 @@
 #include "hci_core.h"
 #include "conn_internal.h"
 #include "keys.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "att.h"
 #include "smp.h"
 #include "gatt_internal.h"

net/bluetooth/hci_core.c

@@ -35,7 +35,7 @@
 #include "hci_core.h"
 #include "keys.h"
 #include "conn_internal.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "stack.h"
 
 #if !defined(CONFIG_BLUETOOTH_DEBUG_HCI_CORE)

net/bluetooth/l2cap.c

@@ -32,7 +32,7 @@
 
 #include "hci_core.h"
 #include "conn_internal.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "att.h"
 #include "smp.h"
 

net/bluetooth/l2cap_internal.h

@@ -1,4 +1,6 @@
-/* l2cap.h - L2CAP handling */
+/** @file
+ *  @brief Internal APIs for Bluetooth L2CAP handling.
+ */
 
 /*
  * Copyright (c) 2015 Intel Corporation

net/bluetooth/smp.c

@@ -40,7 +40,7 @@
 #include "hci_core.h"
 #include "keys.h"
 #include "conn_internal.h"
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "smp.h"
 #include "stack.h"
 

net/bluetooth/smp_null.c

@@ -21,7 +21,7 @@
 
 #include <bluetooth/bluetooth.h>
 #include <errno.h>
-#include "l2cap.h"
+#include "l2cap_internal.h"
 #include "smp.h"
 
 int bt_smp_sign_verify(struct bt_conn *conn, struct bt_buf *buf)