164 lines
4.9 KiB
C
164 lines
4.9 KiB
C
/** @file
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* @brief Bluetooth L2CAP handling
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*/
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __BT_L2CAP_H
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#define __BT_L2CAP_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(CONFIG_BLUETOOTH_CENTRAL) || defined(CONFIG_BLUETOOTH_PERIPHERAL)
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#include <net/buf.h>
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#include <bluetooth/conn.h>
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/** @brief L2CAP Endpoint structure. */
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struct bt_l2cap_endpoint {
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/** Endpoint CID */
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uint16_t cid;
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/** Endpoint Maximum PDU payload Size */
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uint16_t mps;
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/** Endpoint Maximum Transmission Unit */
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uint16_t mtu;
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/** Endpoint credits */
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struct nano_sem credits;
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};
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/** @brief L2CAP Channel structure. */
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struct bt_l2cap_chan {
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/** Channel connection reference */
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struct bt_conn *conn;
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/** Channel operations reference */
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struct bt_l2cap_chan_ops *ops;
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/** Channel Transmission Endpoint */
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struct bt_l2cap_endpoint tx;
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/** Channel Receiving Endpoint */
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struct bt_l2cap_endpoint rx;
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struct net_buf *_sdu;
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uint16_t _sdu_len;
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uint8_t _ident;
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struct bt_l2cap_chan *_next;
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};
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/** @brief L2CAP Channel operations structure. */
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struct bt_l2cap_chan_ops {
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/** Channel connected callback */
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void (*connected)(struct bt_l2cap_chan *chan);
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/** Channel disconnected callback */
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void (*disconnected)(struct bt_l2cap_chan *chan);
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/** Channel encrypt_change callback */
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void (*encrypt_change)(struct bt_l2cap_chan *chan);
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/** Channel get_buf callback */
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struct net_buf *(*alloc_buf)(struct bt_l2cap_chan *chan);
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/** Channel recv callback */
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void (*recv)(struct bt_l2cap_chan *chan,
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struct net_buf *buf);
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};
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#if defined(CONFIG_BLUETOOTH_L2CAP_DYNAMIC_CHANNEL)
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/** @def BT_L2CAP_CHAN_SEND_RESERVE
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* @brief Headroom needed for outgoing buffers
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*/
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#define BT_L2CAP_CHAN_SEND_RESERVE (CONFIG_BLUETOOTH_HCI_SEND_RESERVE + 4 + 4 \
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+ 2)
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/** @brief L2CAP Server structure. */
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struct bt_l2cap_server {
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/** Server PSM */
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uint16_t psm;
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/** Server accept callack */
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int (*accept)(struct bt_conn *conn, struct bt_l2cap_chan **chan);
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struct bt_l2cap_server *_next;
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};
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/** @brief Register L2CAP server.
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*
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* Register L2CAP server for a PSM.
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*
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* @param server Server structure.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_server_register(struct bt_l2cap_server *server);
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/** @brief Connect L2CAP channel
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*
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* Connect L2CAP channel by PSM.
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*
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* @param conn Connection object.
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* @param chan Channel object.
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* @param psm Channel PSM to connect to.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_connect(struct bt_conn *conn, struct bt_l2cap_chan *chan,
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uint16_t psm);
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/** @brief Disconnect L2CAP channel
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*
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* Disconnect L2CAP channel, if the connection is pending it will be
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* canceled.
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*
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* @param chan Channel object.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_disconnect(struct bt_l2cap_chan *chan);
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/** @brief Send data to L2CAP channel
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*
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* Send data from buffer to the channel. This procedure may block waiting for
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* credits to send data therefore it shall be used from a fiber to be able to
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* receive credits when necessary.
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*
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* @return Bytes sent in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_send(struct bt_l2cap_chan *chan, struct net_buf *buf);
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#endif /* CONFIG_BLUETOOTH_L2CAP_DYNAMIC_CHANNEL */
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#endif /* CONFIG_BLUETOOTH_CENTRAL || CONFIG_BLUETOOTH_PERIPHERAL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BT_L2CAP_H */
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