/******************************************************************************
*
* Copyright (C) 2003-2012 Broadcom 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.
*
******************************************************************************/
/******************************************************************************
*
* This module contains API of the audio/video control transport protocol.
*
******************************************************************************/
#include <string.h>
#include "bt_types.h"
#include "bt_target.h"
#include "bt_utils.h"
#include "gki.h"
#include "l2c_api.h"
#include "l2cdefs.h"
#include "btm_api.h"
#include "avct_api.h"
#include "avct_int.h"
/* Control block for AVCT */
#if AVCT_DYNAMIC_MEMORY == FALSE
tAVCT_CB avct_cb;
#endif
/*******************************************************************************
**
** Function AVCT_Register
**
** Description This is the system level registration function for the
** AVCTP protocol. This function initializes AVCTP and
** prepares the protocol stack for its use. This function
** must be called once by the system or platform using AVCTP
** before the other functions of the API an be used.
**
**
** Returns void
**
*******************************************************************************/
void AVCT_Register(UINT16 mtu, UINT16 mtu_br, UINT8 sec_mask)
{
UNUSED(mtu_br);
AVCT_TRACE_API("AVCT_Register");
/* register PSM with L2CAP */
L2CA_Register(AVCT_PSM, (tL2CAP_APPL_INFO *) &avct_l2c_appl);
/* set security level */
BTM_SetSecurityLevel(TRUE, "", BTM_SEC_SERVICE_AVCTP, sec_mask, AVCT_PSM, 0, 0);
BTM_SetSecurityLevel(FALSE, "", BTM_SEC_SERVICE_AVCTP, sec_mask, AVCT_PSM, 0, 0);
/* initialize AVCTP data structures */
memset(&avct_cb, 0, sizeof(tAVCT_CB));
#if (AVCT_BROWSE_INCLUDED == TRUE)
/* Include the browsing channel which uses eFCR */
L2CA_Register(AVCT_BR_PSM, (tL2CAP_APPL_INFO *) &avct_l2c_br_appl);
BTM_SetSecurityLevel(TRUE, "", BTM_SEC_SERVICE_AVCTP_BROWSE, sec_mask, AVCT_BR_PSM, 0, 0);
BTM_SetSecurityLevel(FALSE, "", BTM_SEC_SERVICE_AVCTP_BROWSE, sec_mask, AVCT_BR_PSM, 0, 0);
if (mtu_br < AVCT_MIN_BROWSE_MTU)
mtu_br = AVCT_MIN_BROWSE_MTU;
avct_cb.mtu_br = mtu_br;
#endif
#if defined(AVCT_INITIAL_TRACE_LEVEL)
avct_cb.trace_level = AVCT_INITIAL_TRACE_LEVEL;
#else
avct_cb.trace_level = BT_TRACE_LEVEL_NONE;
#endif
if (mtu < AVCT_MIN_CONTROL_MTU)
mtu = AVCT_MIN_CONTROL_MTU;
/* store mtu */
avct_cb.mtu = mtu;
}
/*******************************************************************************
**
** Function AVCT_Deregister
**
** Description This function is called to deregister use AVCTP protocol.
** It is called when AVCTP is no longer being used by any
** application in the system. Before this function can be
** called, all connections must be removed with
** AVCT_RemoveConn().
**
**
** Returns void
**
*******************************************************************************/
void AVCT_Deregister(void)
{
AVCT_TRACE_API("AVCT_Deregister");
/* deregister PSM with L2CAP */
L2CA_Deregister(AVCT_PSM);
}
/*******************************************************************************
**
** Function AVCT_CreateConn
**
** Description Create an AVCTP connection. There are two types of
** connections, initiator and acceptor, as determined by
** the p_cc->role parameter. When this function is called to
** create an initiator connection, an AVCTP connection to
** the peer device is initiated if one does not already exist.
** If an acceptor connection is created, the connection waits
** passively for an incoming AVCTP connection from a peer device.
**
**
** Returns AVCT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVCT_CreateConn(UINT8 *p_handle, tAVCT_CC *p_cc, BD_ADDR peer_addr)
{
UINT16 result = AVCT_SUCCESS;
tAVCT_CCB *p_ccb;
tAVCT_LCB *p_lcb;
AVCT_TRACE_API("AVCT_CreateConn: %d, control:%d", p_cc->role, p_cc->control);
/* Allocate ccb; if no ccbs, return failure */
if ((p_ccb = avct_ccb_alloc(p_cc)) == NULL)
{
result = AVCT_NO_RESOURCES;
}
else
{
/* get handle */
*p_handle = avct_ccb_to_idx(p_ccb);
/* if initiator connection */
if (p_cc->role == AVCT_INT)
{
/* find link; if none allocate a new one */
if ((p_lcb = avct_lcb_by_bd(peer_addr)) == NULL)
{
if ((p_lcb = avct_lcb_alloc(peer_addr)) == NULL)
{
/* no link resources; free ccb as well */
avct_ccb_dealloc(p_ccb, AVCT_NO_EVT, 0, NULL);
result = AVCT_NO_RESOURCES;
}
}
/* check if PID already in use */
else if (avct_lcb_has_pid(p_lcb, p_cc->pid))
{
avct_ccb_dealloc(p_ccb, AVCT_NO_EVT, 0, NULL);
result = AVCT_PID_IN_USE;
}
if (result == AVCT_SUCCESS)
{
/* bind lcb to ccb */
p_ccb->p_lcb = p_lcb;
AVCT_TRACE_DEBUG("ch_state: %d", p_lcb->ch_state);
avct_lcb_event(p_lcb, AVCT_LCB_UL_BIND_EVT, (tAVCT_LCB_EVT *) &p_ccb);
}
}
}
return result;
}
/*******************************************************************************
**
** Function AVCT_RemoveConn
**
** Description Remove an AVCTP connection. This function is called when
** the application is no longer using a connection. If this
** is the last connection to a peer the L2CAP channel for AVCTP
** will be closed.
**
**
** Returns AVCT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVCT_RemoveConn(UINT8 handle)
{
UINT16 result = AVCT_SUCCESS;
tAVCT_CCB *p_ccb;
AVCT_TRACE_API("AVCT_RemoveConn");
/* map handle to ccb */
if ((p_ccb = avct_ccb_by_idx(handle)) == NULL)
{
result = AVCT_BAD_HANDLE;
}
/* if connection not bound to lcb, dealloc */
else if (p_ccb->p_lcb == NULL)
{
avct_ccb_dealloc(p_ccb, AVCT_NO_EVT, 0, NULL);
}
/* send unbind event to lcb */
else
{
avct_lcb_event(p_ccb->p_lcb, AVCT_LCB_UL_UNBIND_EVT, (tAVCT_LCB_EVT *) &p_ccb);
}
return result;
}
/*******************************************************************************
**
** Function AVCT_CreateBrowse
**
** Description Create an AVCTP Browse channel. There are two types of
** connections, initiator and acceptor, as determined by
** the role parameter. When this function is called to
** create an initiator connection, the Browse channel to
** the peer device is initiated if one does not already exist.
** If an acceptor connection is created, the connection waits
** passively for an incoming AVCTP connection from a peer device.
**
**
** Returns AVCT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVCT_CreateBrowse (UINT8 handle, UINT8 role)
{
#if (AVCT_BROWSE_INCLUDED == TRUE)
UINT16 result = AVCT_SUCCESS;
tAVCT_CCB *p_ccb;
tAVCT_BCB *p_bcb;
int index;
AVCT_TRACE_API("AVCT_CreateBrowse: %d", role);
/* map handle to ccb */
if ((p_ccb = avct_ccb_by_idx(handle)) == NULL)
{
return AVCT_BAD_HANDLE;
}
else
{
/* mark this CCB as supporting browsing channel */
if ((p_ccb->allocated & AVCT_ALOC_BCB) == 0)
{
p_ccb->allocated |= AVCT_ALOC_BCB;
}
}
/* if initiator connection */
if (role == AVCT_INT)
{
/* the link control block must exist before this function is called as INT. */
if ((p_ccb->p_lcb == NULL) || (p_ccb->p_lcb->allocated == 0))
{
result = AVCT_NOT_OPEN;
}
else
{
/* find link; if none allocate a new one */
index = p_ccb->p_lcb->allocated;
if (index > AVCT_NUM_LINKS)
{
result = AVCT_BAD_HANDLE;
}
else
{
p_bcb = &avct_cb.bcb[index - 1];
p_bcb->allocated = index;
}
}
if (result == AVCT_SUCCESS)
{
/* bind bcb to ccb */
p_ccb->p_bcb = p_bcb;
AVCT_TRACE_DEBUG("ch_state: %d", p_bcb->ch_state);
avct_bcb_event(p_bcb, AVCT_LCB_UL_BIND_EVT, (tAVCT_LCB_EVT *) &p_ccb);
}
}
return result;
#else
UNUSED(handle);
UNUSED(role);
return AVCT_NO_RESOURCES;
#endif
}
/*******************************************************************************
**
** Function AVCT_RemoveBrowse
**
** Description Remove an AVCTP Browse channel. This function is called when
** the application is no longer using a connection. If this
** is the last connection to a peer the L2CAP channel for AVCTP
** will be closed.
**
**
** Returns AVCT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVCT_RemoveBrowse (UINT8 handle)
{
#if (AVCT_BROWSE_INCLUDED == TRUE)
UINT16 result = AVCT_SUCCESS;
tAVCT_CCB *p_ccb;
AVCT_TRACE_API("AVCT_RemoveBrowse");
/* map handle to ccb */
if ((p_ccb = avct_ccb_by_idx(handle)) == NULL)
{
result = AVCT_BAD_HANDLE;
}
else if (p_ccb->p_bcb != NULL)
/* send unbind event to bcb */
{
avct_bcb_event(p_ccb->p_bcb, AVCT_LCB_UL_UNBIND_EVT, (tAVCT_LCB_EVT *) &p_ccb);
}
return result;
#else
UNUSED(handle);
return AVCT_NO_RESOURCES;
#endif
}
/*******************************************************************************
**
** Function AVCT_GetBrowseMtu
**
** Description Get the peer_mtu for the AVCTP Browse channel of the given
** connection.
**
** Returns the peer browsing channel MTU.
**
*******************************************************************************/
UINT16 AVCT_GetBrowseMtu (UINT8 handle)
{
UINT16 peer_mtu = AVCT_MIN_BROWSE_MTU;
#if (AVCT_BROWSE_INCLUDED == TRUE)
tAVCT_CCB *p_ccb;
if ((p_ccb = avct_ccb_by_idx(handle)) != NULL && p_ccb->p_bcb != NULL)
{
peer_mtu = p_ccb->p_bcb->peer_mtu;
}
#else
UNUSED(handle);
#endif
return peer_mtu;
}
/*******************************************************************************
**
** Function AVCT_GetPeerMtu
**
** Description Get the peer_mtu for the AVCTP channel of the given
** connection.
**
** Returns the peer MTU size.
**
*******************************************************************************/
UINT16 AVCT_GetPeerMtu (UINT8 handle)
{
UINT16 peer_mtu = L2CAP_DEFAULT_MTU;
tAVCT_CCB *p_ccb;
/* map handle to ccb */
if ((p_ccb = avct_ccb_by_idx(handle)) != NULL)
{
if (p_ccb->p_lcb)
{
peer_mtu = p_ccb->p_lcb->peer_mtu;
}
}
return peer_mtu;
}
/*******************************************************************************
**
** Function AVCT_MsgReq
**
** Description Send an AVCTP message to a peer device. In calling
** AVCT_MsgReq(), the application should keep track of the
** congestion state of AVCTP as communicated with events
** AVCT_CONG_IND_EVT and AVCT_UNCONG_IND_EVT. If the
** application calls AVCT_MsgReq() when AVCTP is congested
** the message may be discarded. The application may make its
** first call to AVCT_MsgReq() after it receives an
** AVCT_CONNECT_CFM_EVT or AVCT_CONNECT_IND_EVT on control channel or
** AVCT_BROWSE_CONN_CFM_EVT or AVCT_BROWSE_CONN_IND_EVT on browsing channel.
**
** p_msg->layer_specific must be set to
** AVCT_DATA_CTRL for control channel traffic;
** AVCT_DATA_BROWSE for for browse channel traffic.
**
** Returns AVCT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVCT_MsgReq(UINT8 handle, UINT8 label, UINT8 cr, BT_HDR *p_msg)
{
UINT16 result = AVCT_SUCCESS;
tAVCT_CCB *p_ccb;
tAVCT_UL_MSG ul_msg;
AVCT_TRACE_API("AVCT_MsgReq");
/* verify p_msg parameter */
if (p_msg == NULL)
{
return AVCT_NO_RESOURCES;
}
AVCT_TRACE_API("len: %d", p_msg->len);
/* map handle to ccb */
if ((p_ccb = avct_ccb_by_idx(handle)) == NULL)
{
result = AVCT_BAD_HANDLE;
GKI_freebuf(p_msg);
}
/* verify channel is bound to link */
else if (p_ccb->p_lcb == NULL)
{
result = AVCT_NOT_OPEN;
GKI_freebuf(p_msg);
}
if (result == AVCT_SUCCESS)
{
ul_msg.p_buf = p_msg;
ul_msg.p_ccb = p_ccb;
ul_msg.label = label;
ul_msg.cr = cr;
#if (AVCT_BROWSE_INCLUDED == TRUE)
/* send msg event to bcb */
if (p_msg->layer_specific == AVCT_DATA_BROWSE)
{
if (p_ccb->p_bcb == NULL && (p_ccb->allocated & AVCT_ALOC_BCB) == 0)
{
/* BCB channel is not open and not allocated */
result = AVCT_BAD_HANDLE;
GKI_freebuf(p_msg);
}
else
{
p_ccb->p_bcb = avct_bcb_by_lcb(p_ccb->p_lcb);
avct_bcb_event(p_ccb->p_bcb, AVCT_LCB_UL_MSG_EVT, (tAVCT_LCB_EVT *) &ul_msg);
}
}
/* send msg event to lcb */
else
#endif
{
avct_lcb_event(p_ccb->p_lcb, AVCT_LCB_UL_MSG_EVT, (tAVCT_LCB_EVT *) &ul_msg);
}
}
return result;
}