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esp-idf/components/bt/bluedroid/stack/l2cap/l2c_api.c

1927 wiersze
69 KiB
C
Czysty Wina Historia

/******************************************************************************
*
* Copyright (C) 1999-2012 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 file contains the L2CAP API code
*
******************************************************************************/
//#define LOG_TAG "bt_l2cap"
//#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "bt_trace.h"
#include "gki.h"
#include "bt_types.h"
#include "hcidefs.h"
#include "hcimsgs.h"
#include "l2cdefs.h"
#include "l2c_int.h"
#include "btu.h"
#include "btm_api.h"
#include "allocator.h"
#if (CLASSIC_BT_INCLUDED == TRUE)
/*******************************************************************************
**
** Function L2CA_Register
**
** Description Other layers call this function to register for L2CAP
** services.
**
** Returns PSM to use or zero if error. Typically, the PSM returned
** is the same as was passed in, but for an outgoing-only
** connection to a dynamic PSM, a "virtual" PSM is returned
** and should be used in the calls to L2CA_ConnectReq(),
** L2CA_ErtmConnectReq() and L2CA_Deregister()
**
*******************************************************************************/
UINT16 L2CA_Register (UINT16 psm, tL2CAP_APPL_INFO *p_cb_info)
{
tL2C_RCB *p_rcb;
UINT16 vpsm = psm;
/* Verify that the required callback info has been filled in
** Note: Connection callbacks are required but not checked
** for here because it is possible to be only a client
** or only a server.
*/
if ((!p_cb_info->pL2CA_ConfigCfm_Cb)
|| (!p_cb_info->pL2CA_ConfigInd_Cb)
|| (!p_cb_info->pL2CA_DataInd_Cb)
|| (!p_cb_info->pL2CA_DisconnectInd_Cb)) {
L2CAP_TRACE_ERROR ("L2CAP - no cb registering PSM: 0x%04x", psm);
return (0);
}
/* Verify PSM is valid */
if (L2C_INVALID_PSM(psm)) {
L2CAP_TRACE_ERROR ("L2CAP - invalid PSM value, PSM: 0x%04x", psm);
return (0);
}
/* Check if this is a registration for an outgoing-only connection to */
/* a dynamic PSM. If so, allocate a "virtual" PSM for the app to use. */
if ( (psm >= 0x1001) && (p_cb_info->pL2CA_ConnectInd_Cb == NULL) ) {
for (vpsm = 0x1002; vpsm < 0x8000; vpsm += 2) {
if ((p_rcb = l2cu_find_rcb_by_psm (vpsm)) == NULL) {
break;
}
}
//L2CAP_TRACE_API ("L2CA_Register - Real PSM: 0x%04x Virtual PSM: 0x%04x", psm, vpsm);
}
/* If registration block already there, just overwrite it */
if ((p_rcb = l2cu_find_rcb_by_psm (vpsm)) == NULL) {
if ((p_rcb = l2cu_allocate_rcb (vpsm)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no RCB available, PSM: 0x%04x vPSM: 0x%04x", psm, vpsm);
return (0);
}
}
p_rcb->api = *p_cb_info;
p_rcb->real_psm = psm;
return (vpsm);
}
/*******************************************************************************
**
** Function L2CA_Deregister
**
** Description Other layers call this function to de-register for L2CAP
** services.
**
** Returns void
**
*******************************************************************************/
void L2CA_Deregister (UINT16 psm)
{
tL2C_RCB *p_rcb;
tL2C_CCB *p_ccb;
tL2C_LCB *p_lcb;
int ii;
if ((p_rcb = l2cu_find_rcb_by_psm (psm)) != NULL) {
p_lcb = &l2cb.lcb_pool[0];
for (ii = 0; ii < MAX_L2CAP_LINKS; ii++, p_lcb++) {
if (p_lcb->in_use) {
if (((p_ccb = p_lcb->ccb_queue.p_first_ccb) == NULL)
|| (p_lcb->link_state == LST_DISCONNECTING)) {
continue;
}
if ((p_ccb->in_use) &&
((p_ccb->chnl_state == CST_W4_L2CAP_DISCONNECT_RSP) ||
(p_ccb->chnl_state == CST_W4_L2CA_DISCONNECT_RSP))) {
continue;
}
if (p_ccb->p_rcb == p_rcb) {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_REQ, NULL);
}
}
}
l2cu_release_rcb (p_rcb);
} else {
L2CAP_TRACE_WARNING ("L2CAP - PSM: 0x%04x not found for deregistration", psm);
}
}
/*******************************************************************************
**
** Function L2CA_AllocatePSM
**
** Description Other layers call this function to find an unused PSM for L2CAP
** services.
**
** Returns PSM to use.
**
*******************************************************************************/
UINT16 L2CA_AllocatePSM(void)
{
BOOLEAN done = FALSE;
UINT16 psm = l2cb.dyn_psm;
while (!done) {
psm += 2;
if (psm > 0xfeff) {
psm = 0x1001;
} else if (psm & 0x0100) {
/* the upper byte must be even */
psm += 0x0100;
}
/* if psm is in range of reserved BRCM Aware features */
if ((BRCM_RESERVED_PSM_START <= psm) && (psm <= BRCM_RESERVED_PSM_END)) {
continue;
}
/* make sure the newlly allocated psm is not used right now */
if ((l2cu_find_rcb_by_psm (psm)) == NULL) {
done = TRUE;
}
}
l2cb.dyn_psm = psm;
return (psm);
}
/*******************************************************************************
**
** Function L2CA_ConnectReq
**
** Description Higher layers call this function to create an L2CAP connection.
** Note that the connection is not established at this time, but
** connection establishment gets started. The callback function
** will be invoked when connection establishes or fails.
**
** Returns the CID of the connection, or 0 if it failed to start
**
*******************************************************************************/
UINT16 L2CA_ConnectReq (UINT16 psm, BD_ADDR p_bd_addr)
{
return L2CA_ErtmConnectReq (psm, p_bd_addr, NULL);
}
/*******************************************************************************
**
** Function L2CA_ErtmConnectReq
**
** Description Higher layers call this function to create an L2CAP connection.
** Note that the connection is not established at this time, but
** connection establishment gets started. The callback function
** will be invoked when connection establishes or fails.
**
** Parameters: PSM: L2CAP PSM for the connection
** BD address of the peer
** Enhaced retransmission mode configurations
** Returns the CID of the connection, or 0 if it failed to start
**
*******************************************************************************/
UINT16 L2CA_ErtmConnectReq (UINT16 psm, BD_ADDR p_bd_addr, tL2CAP_ERTM_INFO *p_ertm_info)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
tL2C_RCB *p_rcb;
//counter_add("l2cap.conn.req", 1);
L2CAP_TRACE_API ("L2CA_ErtmConnectReq() PSM: 0x%04x BDA: %08x%04x p_ertm_info: %p allowed:0x%x preferred:%d", psm,
(p_bd_addr[0] << 24) + (p_bd_addr[1] << 16) + (p_bd_addr[2] << 8) + p_bd_addr[3],
(p_bd_addr[4] << 8) + p_bd_addr[5], p_ertm_info,
(p_ertm_info) ? p_ertm_info->allowed_modes : 0,
(p_ertm_info) ? p_ertm_info->preferred_mode : 0);
/* Fail if we have not established communications with the controller */
if (!BTM_IsDeviceUp()) {
L2CAP_TRACE_WARNING ("L2CAP connect req - BTU not ready");
return (0);
}
/* Fail if the PSM is not registered */
if ((p_rcb = l2cu_find_rcb_by_psm (psm)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no RCB for L2CA_conn_req, PSM: 0x%04x", psm);
return (0);
}
/* First, see if we already have a link to the remote */
/* assume all ERTM l2cap connection is going over BR/EDR for now */
if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) {
/* No link. Get an LCB and start link establishment */
if ( ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL)
/* currently use BR/EDR for ERTM mode l2cap connection */
|| (l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR) == FALSE) ) {
L2CAP_TRACE_WARNING ("L2CAP - conn not started for PSM: 0x%04x p_lcb: %p", psm, p_lcb);
return (0);
}
}
/* Allocate a channel control block */
if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_req, PSM: 0x%04x", psm);
return (0);
}
/* Save registration info */
p_ccb->p_rcb = p_rcb;
if (p_ertm_info) {
p_ccb->ertm_info = *p_ertm_info;
/* Replace default indicators with the actual default pool */
if (p_ccb->ertm_info.fcr_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.fcr_rx_pool_id = L2CAP_FCR_RX_POOL_ID;
}
if (p_ccb->ertm_info.fcr_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.fcr_tx_pool_id = L2CAP_FCR_TX_POOL_ID;
}
if (p_ccb->ertm_info.user_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.user_rx_pool_id = HCI_ACL_POOL_ID;
}
if (p_ccb->ertm_info.user_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.user_tx_pool_id = HCI_ACL_POOL_ID;
}
p_ccb->max_rx_mtu = GKI_get_pool_bufsize (p_ertm_info->user_rx_pool_id) -
(L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET + L2CAP_FCS_LEN);
}
/* If link is up, start the L2CAP connection */
if (p_lcb->link_state == LST_CONNECTED) {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_REQ, NULL);
}
/* If link is disconnecting, save link info to retry after disconnect
* Possible Race condition when a reconnect occurs
* on the channel during a disconnect of link. This
* ccb will be automatically retried after link disconnect
* arrives
*/
else if (p_lcb->link_state == LST_DISCONNECTING) {
L2CAP_TRACE_DEBUG ("L2CAP API - link disconnecting: RETRY LATER");
/* Save ccb so it can be started after disconnect is finished */
p_lcb->p_pending_ccb = p_ccb;
}
L2CAP_TRACE_API ("L2CAP - L2CA_conn_req(psm: 0x%04x) returned CID: 0x%04x", psm, p_ccb->local_cid);
/* Return the local CID as our handle */
return (p_ccb->local_cid);
}
bool L2CA_SetConnectionCallbacks(uint16_t local_cid, const tL2CAP_APPL_INFO *callbacks)
{
assert(callbacks != NULL);
assert(callbacks->pL2CA_ConnectInd_Cb == NULL);
assert(callbacks->pL2CA_ConnectCfm_Cb != NULL);
assert(callbacks->pL2CA_ConfigInd_Cb != NULL);
assert(callbacks->pL2CA_ConfigCfm_Cb != NULL);
assert(callbacks->pL2CA_DisconnectInd_Cb != NULL);
assert(callbacks->pL2CA_DisconnectCfm_Cb != NULL);
assert(callbacks->pL2CA_CongestionStatus_Cb != NULL);
assert(callbacks->pL2CA_DataInd_Cb != NULL);
assert(callbacks->pL2CA_TxComplete_Cb != NULL);
tL2C_CCB *channel_control_block = l2cu_find_ccb_by_cid(NULL, local_cid);
if (!channel_control_block) {
LOG_ERROR("%s no channel control block found for L2CAP LCID=0x%04x.", __func__, local_cid);
return false;
}
// We're making a connection-specific registration control block so we check if
// we already have a private one allocated to us on the heap. If not, we make a
// new allocation, mark it as heap-allocated, and inherit the fields from the old
// control block.
tL2C_RCB *registration_control_block = channel_control_block->p_rcb;
if (!channel_control_block->should_free_rcb) {
registration_control_block = (tL2C_RCB *)osi_calloc(sizeof(tL2C_RCB));
if (!registration_control_block) {
LOG_ERROR("%s unable to allocate registration control block.", __func__);
return false;
}
*registration_control_block = *channel_control_block->p_rcb;
channel_control_block->p_rcb = registration_control_block;
channel_control_block->should_free_rcb = true;
}
registration_control_block->api = *callbacks;
return true;
}
/*******************************************************************************
**
** Function L2CA_ConnectRsp
**
** Description Higher layers call this function to accept an incoming
** L2CAP connection, for which they had gotten an connect
** indication callback.
**
** Returns TRUE for success, FALSE for failure
**
*******************************************************************************/
BOOLEAN L2CA_ConnectRsp (BD_ADDR p_bd_addr, UINT8 id, UINT16 lcid,
UINT16 result, UINT16 status)
{
return L2CA_ErtmConnectRsp (p_bd_addr, id, lcid, result, status, NULL);
}
/*******************************************************************************
**
** Function L2CA_ErtmConnectRsp
**
** Description Higher layers call this function to accept an incoming
** L2CAP connection, for which they had gotten an connect
** indication callback.
**
** Returns TRUE for success, FALSE for failure
**
*******************************************************************************/
BOOLEAN L2CA_ErtmConnectRsp (BD_ADDR p_bd_addr, UINT8 id, UINT16 lcid, UINT16 result,
UINT16 status, tL2CAP_ERTM_INFO *p_ertm_info)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
//counter_add("l2cap.conn.rsp", 1);
L2CAP_TRACE_API ("L2CA_ErtmConnectRsp() CID: 0x%04x Result: %d Status: %d BDA: %08x%04x p_ertm_info:%p",
lcid, result, status,
(p_bd_addr[0] << 24) + (p_bd_addr[1] << 16) + (p_bd_addr[2] << 8) + p_bd_addr[3],
(p_bd_addr[4] << 8) + p_bd_addr[5], p_ertm_info);
/* First, find the link control block */
if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) {
/* No link. Get an LCB and start link establishment */
L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_conn_rsp");
return (FALSE);
}
/* Now, find the channel control block */
if ((p_ccb = l2cu_find_ccb_by_cid (p_lcb, lcid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_rsp");
return (FALSE);
}
/* The IDs must match */
if (p_ccb->remote_id != id) {
L2CAP_TRACE_WARNING ("L2CAP - bad id in L2CA_conn_rsp. Exp: %d Got: %d", p_ccb->remote_id, id);
return (FALSE);
}
if (p_ertm_info) {
p_ccb->ertm_info = *p_ertm_info;
/* Replace default indicators with the actual default pool */
if (p_ccb->ertm_info.fcr_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.fcr_rx_pool_id = L2CAP_FCR_RX_POOL_ID;
}
if (p_ccb->ertm_info.fcr_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.fcr_tx_pool_id = L2CAP_FCR_TX_POOL_ID;
}
if (p_ccb->ertm_info.user_rx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.user_rx_pool_id = HCI_ACL_POOL_ID;
}
if (p_ccb->ertm_info.user_tx_pool_id == L2CAP_DEFAULT_ERM_POOL_ID) {
p_ccb->ertm_info.user_tx_pool_id = HCI_ACL_POOL_ID;
}
p_ccb->max_rx_mtu = GKI_get_pool_bufsize (p_ertm_info->user_rx_pool_id) - (L2CAP_MIN_OFFSET + L2CAP_SDU_LEN_OFFSET + L2CAP_FCS_LEN);
}
if (result == L2CAP_CONN_OK) {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP, NULL);
} else {
tL2C_CONN_INFO conn_info;
conn_info.l2cap_result = result;
conn_info.l2cap_status = status;
if (result == L2CAP_CONN_PENDING) {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP, &conn_info);
} else {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONNECT_RSP_NEG, &conn_info);
}
}
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_ConfigReq
**
** Description Higher layers call this function to send configuration.
**
** Note: The FCR options of p_cfg are not used.
**
** Returns TRUE if configuration sent, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_ConfigReq (UINT16 cid, tL2CAP_CFG_INFO *p_cfg)
{
tL2C_CCB *p_ccb;
//counter_add("l2cap.cfg.req", 1);
L2CAP_TRACE_API ("L2CA_ConfigReq() CID 0x%04x: fcr_present:%d (mode %d) mtu_present:%d (%d)",
cid, p_cfg->fcr_present, p_cfg->fcr.mode, p_cfg->mtu_present, p_cfg->mtu);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_cfg_req, CID: %d", cid);
return (FALSE);
}
/* We need to have at least one mode type common with the peer */
if (!l2c_fcr_adj_our_req_options(p_ccb, p_cfg)) {
return (FALSE);
}
/* Don't adjust FCR options if not used */
if ((!p_cfg->fcr_present) || (p_cfg->fcr.mode == L2CAP_FCR_BASIC_MODE)) {
/* FCR and FCS options are not used in basic mode */
p_cfg->fcs_present = FALSE;
p_cfg->ext_flow_spec_present = FALSE;
if ( (p_cfg->mtu_present) && (p_cfg->mtu > L2CAP_MTU_SIZE) ) {
L2CAP_TRACE_WARNING ("L2CAP - adjust MTU: %u too large", p_cfg->mtu);
p_cfg->mtu = L2CAP_MTU_SIZE;
}
}
/* Save the adjusted configuration in case it needs to be used for renegotiation */
p_ccb->our_cfg = *p_cfg;
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_REQ, p_cfg);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_ConfigRsp
**
** Description Higher layers call this function to send a configuration
** response.
**
** Returns TRUE if configuration response sent, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_ConfigRsp (UINT16 cid, tL2CAP_CFG_INFO *p_cfg)
{
tL2C_CCB *p_ccb;
//counter_add("l2cap.cfg.rsp", 1);
L2CAP_TRACE_API ("L2CA_ConfigRsp() CID: 0x%04x Result: %d MTU present:%d Flush TO:%d FCR:%d FCS:%d",
cid, p_cfg->result, p_cfg->mtu_present, p_cfg->flush_to_present, p_cfg->fcr_present, p_cfg->fcs_present);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_cfg_rsp, CID: %d", cid);
return (FALSE);
}
if ( (p_cfg->result == L2CAP_CFG_OK) || (p_cfg->result == L2CAP_CFG_PENDING) ) {
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_RSP, p_cfg);
} else {
p_cfg->fcr_present = FALSE; /* FCR options already negotiated before this point */
/* Clear out any cached options that are being returned as an error (excluding FCR) */
if (p_cfg->mtu_present) {
p_ccb->peer_cfg.mtu_present = FALSE;
}
if (p_cfg->flush_to_present) {
p_ccb->peer_cfg.flush_to_present = FALSE;
}
if (p_cfg->qos_present) {
p_ccb->peer_cfg.qos_present = FALSE;
}
l2c_csm_execute (p_ccb, L2CEVT_L2CA_CONFIG_RSP_NEG, p_cfg);
}
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_DisconnectReq
**
** Description Higher layers call this function to disconnect a channel.
**
** Returns TRUE if disconnect sent, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_DisconnectReq (UINT16 cid)
{
tL2C_CCB *p_ccb;
//counter_add("l2cap.disconn.req", 1);
L2CAP_TRACE_API ("L2CA_DisconnectReq() CID: 0x%04x", cid);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_disc_req, CID: %d", cid);
return (FALSE);
}
l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_REQ, NULL);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_DisconnectRsp
**
** Description Higher layers call this function to acknowledge the
** disconnection of a channel.
**
** Returns void
**
*******************************************************************************/
BOOLEAN L2CA_DisconnectRsp (UINT16 cid)
{
tL2C_CCB *p_ccb;
//counter_add("l2cap.disconn.rsp", 1);
L2CAP_TRACE_API ("L2CA_DisconnectRsp() CID: 0x%04x", cid);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_disc_rsp, CID: %d", cid);
return (FALSE);
}
l2c_csm_execute (p_ccb, L2CEVT_L2CA_DISCONNECT_RSP, NULL);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_Ping
**
** Description Higher layers call this function to send an echo request.
**
** Returns TRUE if echo request sent, else FALSE.
**
*******************************************************************************/
BOOLEAN L2CA_Ping (BD_ADDR p_bd_addr, tL2CA_ECHO_RSP_CB *p_callback)
{
tL2C_LCB *p_lcb;
L2CAP_TRACE_API ("L2CA_Ping() BDA: %02x-%02x-%02x-%02x-%02x-%02x",
p_bd_addr[0], p_bd_addr[1], p_bd_addr[2], p_bd_addr[3], p_bd_addr[4], p_bd_addr[5]);
/* Fail if we have not established communications with the controller */
if (!BTM_IsDeviceUp()) {
return (FALSE);
}
/* First, see if we already have a link to the remote */
if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) {
/* No link. Get an LCB and start link establishment */
if ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_ping");
return (FALSE);
}
if (l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR) == FALSE) {
return (FALSE);
}
p_lcb->p_echo_rsp_cb = p_callback;
return (TRUE);
}
/* We only allow 1 ping outstanding at a time */
if (p_lcb->p_echo_rsp_cb != NULL) {
L2CAP_TRACE_WARNING ("L2CAP - rejected second L2CA_ping");
return (FALSE);
}
/* Have a link control block. If link is disconnecting, tell user to retry later */
if (p_lcb->link_state == LST_DISCONNECTING) {
L2CAP_TRACE_WARNING ("L2CAP - L2CA_ping rejected - link disconnecting");
return (FALSE);
}
/* Save address of callback */
p_lcb->p_echo_rsp_cb = p_callback;
if (p_lcb->link_state == LST_CONNECTED) {
l2cu_adj_id(p_lcb, L2CAP_ADJ_BRCM_ID); /* Make sure not using Broadcom ID */
l2cu_send_peer_echo_req (p_lcb, NULL, 0);
btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_ECHO_RSP_TOUT);
}
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_Echo
**
** Description Higher layers call this function to send an echo request
** with application-specific data.
**
** Returns TRUE if echo request sent, else FALSE.
**
*******************************************************************************/
BOOLEAN L2CA_Echo (BD_ADDR p_bd_addr, BT_HDR *p_data, tL2CA_ECHO_DATA_CB *p_callback)
{
tL2C_LCB *p_lcb;
UINT8 *pp;
L2CAP_TRACE_API ("L2CA_Echo() BDA: %08X%04X",
((p_bd_addr[0] << 24) + (p_bd_addr[1] << 16) + (p_bd_addr[2] << 8) + (p_bd_addr[3])),
((p_bd_addr[4] << 8) + (p_bd_addr[5])));
/* Fail if we have not established communications with the controller */
if (!BTM_IsDeviceUp()) {
return (FALSE);
}
if ((memcmp(BT_BD_ANY, p_bd_addr, BD_ADDR_LEN) == 0) && (p_data == NULL)) {
/* Only register callback without sending message. */
l2cb.p_echo_data_cb = p_callback;
return TRUE;
}
/* We assume the upper layer will call this function only when the link is established. */
if ((p_lcb = l2cu_find_lcb_by_bd_addr (p_bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) {
L2CAP_TRACE_ERROR ("L2CA_Echo ERROR : link not established");
return FALSE;
}
if (p_lcb->link_state != LST_CONNECTED) {
L2CAP_TRACE_ERROR ("L2CA_Echo ERROR : link is not connected");
return FALSE;
}
/* Save address of callback */
l2cb.p_echo_data_cb = p_callback;
/* Set the pointer to the beginning of the data */
pp = (UINT8 *)(p_data + 1) + p_data->offset;
l2cu_adj_id(p_lcb, L2CAP_ADJ_BRCM_ID); /* Make sure not using Broadcom ID */
l2cu_send_peer_echo_req (p_lcb, pp, p_data->len);
return (TRUE);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
bool L2CA_GetIdentifiers(uint16_t lcid, uint16_t *rcid, uint16_t *handle)
{
tL2C_CCB *control_block = l2cu_find_ccb_by_cid(NULL, lcid);
if (!control_block) {
return false;
}
if (rcid) {
*rcid = control_block->remote_cid;
}
if (handle) {
*handle = control_block->p_lcb->handle;
}
return true;
}
/*******************************************************************************
**
** Function L2CA_SetIdleTimeout
**
** Description Higher layers call this function to set the idle timeout for
** a connection, or for all future connections. The "idle timeout"
** is the amount of time that a connection can remain up with
** no L2CAP channels on it. A timeout of zero means that the
** connection will be torn down immediately when the last channel
** is removed. A timeout of 0xFFFF means no timeout. Values are
** in seconds.
**
** Returns TRUE if command succeeded, FALSE if failed
**
** NOTE This timeout takes effect after at least 1 channel has been
** established and removed. L2CAP maintains its own timer from
** whan a connection is established till the first channel is
** set up.
*******************************************************************************/
BOOLEAN L2CA_SetIdleTimeout (UINT16 cid, UINT16 timeout, BOOLEAN is_global)
{
tL2C_CCB *p_ccb;
tL2C_LCB *p_lcb;
if (is_global) {
l2cb.idle_timeout = timeout;
} else {
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_SetIdleTimeout, CID: %d", cid);
return (FALSE);
}
p_lcb = p_ccb->p_lcb;
if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) {
p_lcb->idle_timeout = timeout;
} else {
return (FALSE);
}
}
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SetIdleTimeoutByBdAddr
**
** Description Higher layers call this function to set the idle timeout for
** a connection. The "idle timeout" is the amount of time that
** a connection can remain up with no L2CAP channels on it.
** A timeout of zero means that the connection will be torn
** down immediately when the last channel is removed.
** A timeout of 0xFFFF means no timeout. Values are in seconds.
** A bd_addr is the remote BD address. If bd_addr = BT_BD_ANY,
** then the idle timeouts for all active l2cap links will be
** changed.
**
** Returns TRUE if command succeeded, FALSE if failed
**
** NOTE This timeout applies to all logical channels active on the
** ACL link.
*******************************************************************************/
BOOLEAN L2CA_SetIdleTimeoutByBdAddr(BD_ADDR bd_addr, UINT16 timeout, tBT_TRANSPORT transport)
{
tL2C_LCB *p_lcb;
if (memcmp (BT_BD_ANY, bd_addr, BD_ADDR_LEN)) {
p_lcb = l2cu_find_lcb_by_bd_addr( bd_addr, transport);
if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) {
p_lcb->idle_timeout = timeout;
if (!p_lcb->ccb_queue.p_first_ccb) {
l2cu_no_dynamic_ccbs (p_lcb);
}
} else {
return FALSE;
}
} else {
int xx;
tL2C_LCB *p_lcb = &l2cb.lcb_pool[0];
for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++) {
if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) {
p_lcb->idle_timeout = timeout;
if (!p_lcb->ccb_queue.p_first_ccb) {
l2cu_no_dynamic_ccbs (p_lcb);
}
}
}
}
return TRUE;
}
/*******************************************************************************
**
** Function L2CA_SetTraceLevel
**
** Description This function sets the trace level for L2CAP. If called with
** a value of 0xFF, it simply reads the current trace level.
**
** Returns the new (current) trace level
**
*******************************************************************************/
UINT8 L2CA_SetTraceLevel (UINT8 new_level)
{
if (new_level != 0xFF) {
l2cb.l2cap_trace_level = new_level;
}
return (l2cb.l2cap_trace_level);
}
/*******************************************************************************
**
** Function L2CA_SetDesireRole
**
** Description This function sets the desire role for L2CAP.
** If the new role is L2CAP_ROLE_ALLOW_SWITCH, allow switch on
** HciCreateConnection.
** If the new role is L2CAP_ROLE_DISALLOW_SWITCH, do not allow switch on
** HciCreateConnection.
**
** If the new role is a valid role (HCI_ROLE_MASTER or HCI_ROLE_SLAVE),
** the desire role is set to the new value. Otherwise, it is not changed.
**
** Returns the new (current) role
**
*******************************************************************************/
UINT8 L2CA_SetDesireRole (UINT8 new_role)
{
L2CAP_TRACE_API ("L2CA_SetDesireRole() new:x%x, disallow_switch:%d",
new_role, l2cb.disallow_switch);
if (L2CAP_ROLE_CHECK_SWITCH != (L2CAP_ROLE_CHECK_SWITCH & new_role)) {
/* do not process the allow_switch when both bits are set */
if (new_role & L2CAP_ROLE_ALLOW_SWITCH) {
l2cb.disallow_switch = FALSE;
}
if (new_role & L2CAP_ROLE_DISALLOW_SWITCH) {
l2cb.disallow_switch = TRUE;
}
}
if (new_role == HCI_ROLE_MASTER || new_role == HCI_ROLE_SLAVE) {
l2cb.desire_role = new_role;
}
return (l2cb.desire_role);
}
#if (CLASSIC_BT_INCLUDED == TRUE)
/*******************************************************************************
**
** Function L2CA_LocalLoopbackReq
**
** Description This function sets up a CID for local loopback
**
** Returns CID of 0 if none.
**
*******************************************************************************/
UINT16 L2CA_LocalLoopbackReq (UINT16 psm, UINT16 handle, BD_ADDR p_bd_addr)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
tL2C_RCB *p_rcb;
L2CAP_TRACE_API ("L2CA_LocalLoopbackReq() PSM: %d Handle: 0x%04x", psm, handle);
/* Fail if we have not established communications with the controller */
if (!BTM_IsDeviceUp()) {
L2CAP_TRACE_WARNING ("L2CAP loop req - BTU not ready");
return (0);
}
/* Fail if the PSM is not registered */
if ((p_rcb = l2cu_find_rcb_by_psm (psm)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no RCB for L2CA_conn_req, PSM: %d", psm);
return (0);
}
if ((p_lcb = l2cu_allocate_lcb (p_bd_addr, FALSE, BT_TRANSPORT_BR_EDR)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no LCB for L2CA_conn_req");
return (0);
}
p_lcb->link_state = LST_CONNECTED;
p_lcb->handle = handle;
/* Allocate a channel control block */
if ((p_ccb = l2cu_allocate_ccb (p_lcb, 0)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_conn_req");
return (0);
}
/* Save registration info */
p_ccb->p_rcb = p_rcb;
p_ccb->chnl_state = CST_OPEN;
p_ccb->remote_cid = p_ccb->local_cid;
p_ccb->config_done = CFG_DONE_MASK;
/* Return the local CID as our handle */
return (p_ccb->local_cid);
}
/*******************************************************************************
**
** Function L2CA_SetAclPriority
**
** Description Sets the transmission priority for a channel.
** (For initial implementation only two values are valid.
** L2CAP_PRIORITY_NORMAL and L2CAP_PRIORITY_HIGH).
**
** Returns TRUE if a valid channel, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_SetAclPriority (BD_ADDR bd_addr, UINT8 priority)
{
L2CAP_TRACE_API ("L2CA_SetAclPriority() bdaddr: %02x%02x%02x%02x%04x, priority:%d",
bd_addr[0], bd_addr[1], bd_addr[2],
bd_addr[3], (bd_addr[4] << 8) + bd_addr[5], priority);
return (l2cu_set_acl_priority(bd_addr, priority, FALSE));
}
/*******************************************************************************
**
** Function L2CA_FlowControl
**
** Description Higher layers call this function to flow control a channel.
**
** data_enabled - TRUE data flows, FALSE data is stopped
**
** Returns TRUE if valid channel, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_FlowControl (UINT16 cid, BOOLEAN data_enabled)
{
tL2C_CCB *p_ccb;
BOOLEAN on_off = !data_enabled;
L2CAP_TRACE_API ("L2CA_FlowControl(%d) CID: 0x%04x", on_off, cid);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_FlowControl, CID: 0x%04x data_enabled: %d", cid, data_enabled);
return (FALSE);
}
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) {
L2CAP_TRACE_EVENT ("L2CA_FlowControl() invalid mode:%d", p_ccb->peer_cfg.fcr.mode);
return (FALSE);
}
if (p_ccb->fcrb.local_busy != on_off) {
p_ccb->fcrb.local_busy = on_off;
if ( (p_ccb->chnl_state == CST_OPEN) && (!p_ccb->fcrb.wait_ack) ) {
if (on_off) {
l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RNR, 0);
} else {
l2c_fcr_send_S_frame (p_ccb, L2CAP_FCR_SUP_RR, L2CAP_FCR_P_BIT);
}
}
}
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SendTestSFrame
**
** Description Higher layers call this function to send a test S-frame.
**
** Returns TRUE if valid Channel, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_SendTestSFrame (UINT16 cid, UINT8 sup_type, UINT8 back_track)
{
tL2C_CCB *p_ccb;
L2CAP_TRACE_API ("L2CA_SendTestSFrame() CID: 0x%04x Type: 0x%02x back_track: %u", cid, sup_type, back_track);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_SendTestSFrame, CID: %d", cid);
return (FALSE);
}
if ( (p_ccb->chnl_state != CST_OPEN) || (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) ) {
return (FALSE);
}
p_ccb->fcrb.next_seq_expected -= back_track;
l2c_fcr_send_S_frame (p_ccb, (UINT16)(sup_type & 3), (UINT16)(sup_type & (L2CAP_FCR_P_BIT | L2CAP_FCR_F_BIT)));
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SetTxPriority
**
** Description Sets the transmission priority for a channel.
**
** Returns TRUE if a valid channel, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_SetTxPriority (UINT16 cid, tL2CAP_CHNL_PRIORITY priority)
{
tL2C_CCB *p_ccb;
L2CAP_TRACE_API ("L2CA_SetTxPriority() CID: 0x%04x, priority:%d", cid, priority);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_SetTxPriority, CID: %d", cid);
return (FALSE);
}
/* it will update the order of CCB in LCB by priority and update round robin service variables */
l2cu_change_pri_ccb (p_ccb, priority);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SetChnlDataRate
**
** Description Sets the tx/rx data rate for a channel.
**
** Returns TRUE if a valid channel, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_SetChnlDataRate (UINT16 cid, tL2CAP_CHNL_DATA_RATE tx, tL2CAP_CHNL_DATA_RATE rx)
{
tL2C_CCB *p_ccb;
L2CAP_TRACE_API ("L2CA_SetChnlDataRate() CID: 0x%04x, tx:%d, rx:%d", cid, tx, rx);
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_SetChnlDataRate, CID: %d", cid);
return (FALSE);
}
p_ccb->tx_data_rate = tx;
p_ccb->rx_data_rate = rx;
/* Adjust channel buffer allocation */
l2c_link_adjust_chnl_allocation ();
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SetFlushTimeout
**
** Description This function set the automatic flush time out in Baseband
** for ACL-U packets.
** BdAddr : the remote BD address of ACL link. If it is BT_DB_ANY
** then the flush time out will be applied to all ACL link.
** FlushTimeout: flush time out in ms
** 0x0000 : No automatic flush
** L2CAP_NO_RETRANSMISSION : No retransmission
** 0x0002 - 0xFFFE : flush time out, if (flush_tout*8)+3/5)
** <= HCI_MAX_AUTO_FLUSH_TOUT (in 625us slot).
** Otherwise, return FALSE.
** L2CAP_NO_AUTOMATIC_FLUSH : No automatic flush
**
** Returns TRUE if command succeeded, FALSE if failed
**
** NOTE This flush timeout applies to all logical channels active on the
** ACL link.
*******************************************************************************/
BOOLEAN L2CA_SetFlushTimeout (BD_ADDR bd_addr, UINT16 flush_tout)
{
tL2C_LCB *p_lcb;
UINT16 hci_flush_to;
UINT32 temp;
/* no automatic flush (infinite timeout) */
if (flush_tout == 0x0000) {
hci_flush_to = flush_tout;
flush_tout = L2CAP_NO_AUTOMATIC_FLUSH;
}
/* no retransmission */
else if (flush_tout == L2CAP_NO_RETRANSMISSION) {
/* not mandatory range for controller */
/* Packet is flushed before getting any ACK/NACK */
/* To do this, flush timeout should be 1 baseband slot */
hci_flush_to = flush_tout;
}
/* no automatic flush (infinite timeout) */
else if (flush_tout == L2CAP_NO_AUTOMATIC_FLUSH) {
hci_flush_to = 0x0000;
} else {
/* convert L2CAP flush_to to 0.625 ms units, with round */
temp = (((UINT32)flush_tout * 8) + 3) / 5;
/* if L2CAP flush_to within range of HCI, set HCI flush timeout */
if (temp > HCI_MAX_AUTO_FLUSH_TOUT) {
L2CAP_TRACE_WARNING("WARNING L2CA_SetFlushTimeout timeout(0x%x) is out of range", flush_tout);
return FALSE;
} else {
hci_flush_to = (UINT16)temp;
}
}
if (memcmp (BT_BD_ANY, bd_addr, BD_ADDR_LEN)) {
p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR);
if ((p_lcb) && (p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) {
if (p_lcb->link_flush_tout != flush_tout) {
p_lcb->link_flush_tout = flush_tout;
L2CAP_TRACE_API ("L2CA_SetFlushTimeout 0x%04x ms for bd_addr [...;%02x%02x%02x]",
flush_tout, bd_addr[3], bd_addr[4], bd_addr[5]);
if (!btsnd_hcic_write_auto_flush_tout (p_lcb->handle, hci_flush_to)) {
return (FALSE);
}
}
} else {
L2CAP_TRACE_WARNING ("WARNING L2CA_SetFlushTimeout No lcb for bd_addr [...;%02x%02x%02x]",
bd_addr[3], bd_addr[4], bd_addr[5]);
return (FALSE);
}
} else {
int xx;
p_lcb = &l2cb.lcb_pool[0];
for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p_lcb++) {
if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTED)) {
if (p_lcb->link_flush_tout != flush_tout) {
p_lcb->link_flush_tout = flush_tout;
L2CAP_TRACE_API ("L2CA_SetFlushTimeout 0x%04x ms for bd_addr [...;%02x%02x%02x]",
flush_tout, p_lcb->remote_bd_addr[3],
p_lcb->remote_bd_addr[4], p_lcb->remote_bd_addr[5]);
if (!btsnd_hcic_write_auto_flush_tout(p_lcb->handle, hci_flush_to)) {
return (FALSE);
}
}
}
}
}
return (TRUE);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function L2CA_GetPeerFeatures
**
** Description Get a peers features and fixed channel map
**
** Parameters: BD address of the peer
** Pointers to features and channel mask storage area
**
** Return value: TRUE if peer is connected
**
*******************************************************************************/
BOOLEAN L2CA_GetPeerFeatures (BD_ADDR bd_addr, UINT32 *p_ext_feat, UINT8 *p_chnl_mask)
{
tL2C_LCB *p_lcb;
/* We must already have a link to the remote */
if ((p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR)) == NULL) {
L2CAP_TRACE_WARNING ("L2CA_GetPeerFeatures() No BDA: %08x%04x",
(bd_addr[0] << 24) + (bd_addr[1] << 16) + (bd_addr[2] << 8) + bd_addr[3],
(bd_addr[4] << 8) + bd_addr[5]);
return (FALSE);
}
L2CAP_TRACE_API ("L2CA_GetPeerFeatures() BDA: %08x%04x ExtFea: 0x%08x Chnl_Mask[0]: 0x%02x",
(bd_addr[0] << 24) + (bd_addr[1] << 16) + (bd_addr[2] << 8) + bd_addr[3],
(bd_addr[4] << 8) + bd_addr[5], p_lcb->peer_ext_fea, p_lcb->peer_chnl_mask[0]);
*p_ext_feat = p_lcb->peer_ext_fea;
memcpy (p_chnl_mask, p_lcb->peer_chnl_mask, L2CAP_FIXED_CHNL_ARRAY_SIZE);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_GetBDAddrbyHandle
**
** Description Get BD address for the given HCI handle
**
** Parameters: HCI handle
** BD address of the peer
**
** Return value: TRUE if found lcb for the given handle, FALSE otherwise
**
*******************************************************************************/
BOOLEAN L2CA_GetBDAddrbyHandle (UINT16 handle, BD_ADDR bd_addr)
{
tL2C_LCB *p_lcb = NULL;
BOOLEAN found_dev = FALSE;
p_lcb = l2cu_find_lcb_by_handle (handle);
if (p_lcb) {
found_dev = TRUE;
memcpy (bd_addr, p_lcb->remote_bd_addr, BD_ADDR_LEN);
}
return found_dev;
}
#if (CLASSIC_BT_INCLUDED == TRUE)
/*******************************************************************************
**
** Function L2CA_GetChnlFcrMode
**
** Description Get the channel FCR mode
**
** Parameters: Local CID
**
** Return value: Channel mode
**
*******************************************************************************/
UINT8 L2CA_GetChnlFcrMode (UINT16 lcid)
{
tL2C_CCB *p_ccb = l2cu_find_ccb_by_cid (NULL, lcid);
if (p_ccb) {
L2CAP_TRACE_API ("L2CA_GetChnlFcrMode() returns mode %d", p_ccb->peer_cfg.fcr.mode);
return (p_ccb->peer_cfg.fcr.mode);
}
L2CAP_TRACE_API ("L2CA_GetChnlFcrMode() returns mode L2CAP_FCR_BASIC_MODE");
return (L2CAP_FCR_BASIC_MODE);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
#if (L2CAP_NUM_FIXED_CHNLS > 0)
/*******************************************************************************
**
** Function L2CA_RegisterFixedChannel
**
** Description Register a fixed channel.
**
** Parameters: Fixed Channel #
** Channel Callbacks and config
**
** Return value: -
**
*******************************************************************************/
BOOLEAN L2CA_RegisterFixedChannel (UINT16 fixed_cid, tL2CAP_FIXED_CHNL_REG *p_freg)
{
L2CAP_TRACE_DEBUG ("L2CA_RegisterFixedChannel() CID: 0x%04x, %p", fixed_cid,p_freg);
if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL) ) {
L2CAP_TRACE_ERROR ("L2CA_RegisterFixedChannel() Invalid CID: 0x%04x", fixed_cid);
return (FALSE);
}
l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL] = *p_freg;
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_ConnectFixedChnl
**
** Description Connect an fixed signalling channel to a remote device.
**
** Parameters: Fixed CID
** BD Address of remote
**
** Return value: TRUE if connection started
**
*******************************************************************************/
BOOLEAN L2CA_ConnectFixedChnl (UINT16 fixed_cid, BD_ADDR rem_bda)
{
tL2C_LCB *p_lcb;
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
L2CAP_TRACE_API ("%s() CID: 0x%04x BDA: %08x%04x", __func__, fixed_cid,
(rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]);
// Check CID is valid and registered
if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL)
|| (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) {
L2CAP_TRACE_ERROR ("%s() Invalid CID: 0x%04x", __func__, fixed_cid);
return (FALSE);
}
// Fail if BT is not yet up
if (!BTM_IsDeviceUp()) {
L2CAP_TRACE_WARNING ("%s(0x%04x) - BTU not ready", __func__, fixed_cid);
return (FALSE);
}
#if BLE_INCLUDED == TRUE
if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) {
transport = BT_TRANSPORT_LE;
}
#endif
tL2C_BLE_FIXED_CHNLS_MASK peer_channel_mask;
// If we already have a link to the remote, check if it supports that CID
if ((p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport)) != NULL) {
// Fixed channels are mandatory on LE transports so ignore the received
// channel mask and use the locally cached LE channel mask.
#if BLE_INCLUDED == TRUE
if (transport == BT_TRANSPORT_LE) {
peer_channel_mask = l2cb.l2c_ble_fixed_chnls_mask;
} else
#endif
peer_channel_mask = p_lcb->peer_chnl_mask[0];
// Check for supported channel
if (!(peer_channel_mask & (1 << fixed_cid))) {
L2CAP_TRACE_EVENT ("%s() CID:0x%04x BDA: %08x%04x not supported", __func__,
fixed_cid, (rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3],
(rem_bda[4] << 8) + rem_bda[5]);
return FALSE;
}
// Get a CCB and link the lcb to it
if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid,
&l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) {
L2CAP_TRACE_WARNING ("%s(0x%04x) - LCB but no CCB", __func__, fixed_cid);
return FALSE;
}
// racing with disconnecting, queue the connection request
if (p_lcb->link_state == LST_DISCONNECTING) {
L2CAP_TRACE_DEBUG ("%s() - link disconnecting: RETRY LATER", __func__);
/* Save ccb so it can be started after disconnect is finished */
p_lcb->p_pending_ccb = p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL];
return TRUE;
}
#if BLE_INCLUDED == TRUE
(*l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedConn_Cb)
(fixed_cid, p_lcb->remote_bd_addr, TRUE, 0, p_lcb->transport);
#else
(*l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedConn_Cb)
(fixed_cid, p_lcb->remote_bd_addr, TRUE, 0, BT_TRANSPORT_BR_EDR);
#endif
return TRUE;
}
// No link. Get an LCB and start link establishment
if ((p_lcb = l2cu_allocate_lcb (rem_bda, FALSE, transport)) == NULL) {
L2CAP_TRACE_WARNING ("%s(0x%04x) - no LCB", __func__, fixed_cid);
return FALSE;
}
// Get a CCB and link the lcb to it
if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid,
&l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) {
p_lcb->disc_reason = L2CAP_CONN_NO_RESOURCES;
L2CAP_TRACE_WARNING ("%s(0x%04x) - no CCB", __func__, fixed_cid);
l2cu_release_lcb (p_lcb);
return FALSE;
}
if (!l2cu_create_conn(p_lcb, transport)) {
L2CAP_TRACE_WARNING ("%s() - create_conn failed", __func__);
l2cu_release_lcb (p_lcb);
return FALSE;
}
return TRUE;
}
/*******************************************************************************
**
** Function L2CA_SendFixedChnlData
**
** Description Write data on a fixed channel.
**
** Parameters: Fixed CID
** BD Address of remote
** Pointer to buffer of type BT_HDR
**
** Return value L2CAP_DW_SUCCESS, if data accepted
** L2CAP_DW_FAILED, if error
**
*******************************************************************************/
UINT16 L2CA_SendFixedChnlData (UINT16 fixed_cid, BD_ADDR rem_bda, BT_HDR *p_buf)
{
tL2C_LCB *p_lcb;
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
L2CAP_TRACE_API ("L2CA_SendFixedChnlData() CID: 0x%04x BDA: %08x%04x", fixed_cid,
(rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]);
#if BLE_INCLUDED == TRUE
if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) {
transport = BT_TRANSPORT_LE;
}
#endif
// Check CID is valid and registered
if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL)
|| (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) {
L2CAP_TRACE_ERROR ("L2CA_SendFixedChnlData() Invalid CID: 0x%04x", fixed_cid);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
// Fail if BT is not yet up
if (!BTM_IsDeviceUp()) {
L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData(0x%04x) - BTU not ready", fixed_cid);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
// We need to have a link up
if ((p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport)) == NULL ||
/* if link is disconnecting, also report data sending failure */
p_lcb->link_state == LST_DISCONNECTING) {
L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData(0x%04x) - no LCB", fixed_cid);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
tL2C_BLE_FIXED_CHNLS_MASK peer_channel_mask;
// Select peer channels mask to use depending on transport
#if BLE_INCLUDED == TRUE
if (transport == BT_TRANSPORT_LE) {
peer_channel_mask = l2cb.l2c_ble_fixed_chnls_mask;
} else
#endif
peer_channel_mask = p_lcb->peer_chnl_mask[0];
if ((peer_channel_mask & (1 << fixed_cid)) == 0) {
L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData() - peer does not support fixed chnl: 0x%04x", fixed_cid);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
p_buf->event = 0;
p_buf->layer_specific = L2CAP_FLUSHABLE_CH_BASED;
if (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) {
if (!l2cu_initialize_fixed_ccb (p_lcb, fixed_cid, &l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].fixed_chnl_opts)) {
L2CAP_TRACE_WARNING ("L2CA_SendFixedChnlData() - no CCB for chnl: 0x%4x", fixed_cid);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
}
// If already congested, do not accept any more packets
if (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->cong_sent) {
L2CAP_TRACE_ERROR ("L2CAP - CID: 0x%04x cannot send, already congested \
xmit_hold_q.count: %u buff_quota: %u", fixed_cid,
GKI_queue_length(&p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->xmit_hold_q),
p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->buff_quota);
GKI_freebuf (p_buf);
return (L2CAP_DW_FAILED);
}
l2c_enqueue_peer_data (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL], p_buf);
l2c_link_check_send_pkts (p_lcb, NULL, NULL);
// If there is no dynamic CCB on the link, restart the idle timer each time something is sent
if (p_lcb->in_use && p_lcb->link_state == LST_CONNECTED && !p_lcb->ccb_queue.p_first_ccb) {
l2cu_no_dynamic_ccbs (p_lcb);
}
if (p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->cong_sent) {
return (L2CAP_DW_CONGESTED);
}
return (L2CAP_DW_SUCCESS);
}
/*******************************************************************************
**
** Function L2CA_RemoveFixedChnl
**
** Description Remove a fixed channel to a remote device.
**
** Parameters: Fixed CID
** BD Address of remote
** Idle timeout to use (or 0xFFFF if don't care)
**
** Return value: TRUE if channel removed
**
*******************************************************************************/
BOOLEAN L2CA_RemoveFixedChnl (UINT16 fixed_cid, BD_ADDR rem_bda)
{
tL2C_LCB *p_lcb;
tL2C_CCB *p_ccb;
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
/* Check CID is valid and registered */
if ( (fixed_cid < L2CAP_FIRST_FIXED_CHNL) || (fixed_cid > L2CAP_LAST_FIXED_CHNL)
|| (l2cb.fixed_reg[fixed_cid - L2CAP_FIRST_FIXED_CHNL].pL2CA_FixedData_Cb == NULL) ) {
L2CAP_TRACE_ERROR ("L2CA_RemoveFixedChnl() Invalid CID: 0x%04x", fixed_cid);
return (FALSE);
}
#if BLE_INCLUDED == TRUE
if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) {
transport = BT_TRANSPORT_LE;
}
#endif
/* Is a fixed channel connected to the remote BDA ?*/
p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport);
if ( ((p_lcb) == NULL) || (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) ) {
L2CAP_TRACE_WARNING ("L2CA_RemoveFixedChnl() CID: 0x%04x BDA: %08x%04x not connected", fixed_cid,
(rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]);
return (FALSE);
}
L2CAP_TRACE_API ("L2CA_RemoveFixedChnl() CID: 0x%04x BDA: %08x%04x", fixed_cid,
(rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]);
/* Release the CCB, starting an inactivity timeout on the LCB if no other CCBs exist */
p_ccb = p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL];
p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL] = NULL;
p_lcb->disc_reason = HCI_ERR_CONN_CAUSE_LOCAL_HOST;
#if BLE_INCLUDED == TRUE
// Retain the link for a few more seconds after SMP pairing is done, since the Android
// platform always does service discovery after pairing is complete. This will avoid
// the link down (pairing is complete) and an immediate re-connection for service
// discovery.
// Some devices do not do auto advertising when link is dropped, thus fail the second
// connection and service discovery.
if ((fixed_cid == L2CAP_ATT_CID ) && !p_lcb->ccb_queue.p_first_ccb) {
p_lcb->idle_timeout = 0;
}
#endif
l2cu_release_ccb (p_ccb);
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_SetFixedChannelTout
**
** Description Higher layers call this function to set the idle timeout for
** a fixed channel. The "idle timeout" is the amount of time that
** a connection can remain up with no L2CAP channels on it.
** A timeout of zero means that the connection will be torn
** down immediately when the last channel is removed.
** A timeout of 0xFFFF means no timeout. Values are in seconds.
** A bd_addr is the remote BD address. If bd_addr = BT_BD_ANY,
** then the idle timeouts for all active l2cap links will be
** changed.
**
** Returns TRUE if command succeeded, FALSE if failed
**
*******************************************************************************/
BOOLEAN L2CA_SetFixedChannelTout (BD_ADDR rem_bda, UINT16 fixed_cid, UINT16 idle_tout)
{
tL2C_LCB *p_lcb;
tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
#if BLE_INCLUDED == TRUE
if (fixed_cid >= L2CAP_ATT_CID && fixed_cid <= L2CAP_SMP_CID) {
transport = BT_TRANSPORT_LE;
}
#endif
/* Is a fixed channel connected to the remote BDA ?*/
p_lcb = l2cu_find_lcb_by_bd_addr (rem_bda, transport);
if ( ((p_lcb) == NULL) || (!p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]) ) {
L2CAP_TRACE_WARNING ("L2CA_SetFixedChannelTout() CID: 0x%04x BDA: %08x%04x not connected", fixed_cid,
(rem_bda[0] << 24) + (rem_bda[1] << 16) + (rem_bda[2] << 8) + rem_bda[3], (rem_bda[4] << 8) + rem_bda[5]);
return (FALSE);
}
p_lcb->p_fixed_ccbs[fixed_cid - L2CAP_FIRST_FIXED_CHNL]->fixed_chnl_idle_tout = idle_tout;
if (p_lcb->in_use && p_lcb->link_state == LST_CONNECTED && !p_lcb->ccb_queue.p_first_ccb) {
/* If there are no dynamic CCBs, (re)start the idle timer in case we changed it */
l2cu_no_dynamic_ccbs (p_lcb);
}
return TRUE;
}
#endif /* #if (L2CAP_NUM_FIXED_CHNLS > 0) */
#if (CLASSIC_BT_INCLUDED == TRUE)
/*******************************************************************************
**
** Function L2CA_GetCurrentConfig
**
** Description This function returns configurations of L2CAP channel
** pp_our_cfg : pointer of our saved configuration options
** p_our_cfg_bits : valid config in bitmap
** pp_peer_cfg: pointer of peer's saved configuration options
** p_peer_cfg_bits : valid config in bitmap
**
** Returns TRUE if successful
**
*******************************************************************************/
BOOLEAN L2CA_GetCurrentConfig (UINT16 lcid,
tL2CAP_CFG_INFO **pp_our_cfg, tL2CAP_CH_CFG_BITS *p_our_cfg_bits,
tL2CAP_CFG_INFO **pp_peer_cfg, tL2CAP_CH_CFG_BITS *p_peer_cfg_bits)
{
tL2C_CCB *p_ccb;
L2CAP_TRACE_API ("L2CA_GetCurrentConfig() CID: 0x%04x", lcid);
p_ccb = l2cu_find_ccb_by_cid(NULL, lcid);
if (p_ccb) {
*pp_our_cfg = &(p_ccb->our_cfg);
/* convert valid config items into bitmap */
*p_our_cfg_bits = 0;
if (p_ccb->our_cfg.mtu_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_MTU;
}
if (p_ccb->our_cfg.qos_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_QOS;
}
if (p_ccb->our_cfg.flush_to_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FLUSH_TO;
}
if (p_ccb->our_cfg.fcr_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FCR;
}
if (p_ccb->our_cfg.fcs_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_FCS;
}
if (p_ccb->our_cfg.ext_flow_spec_present) {
*p_our_cfg_bits |= L2CAP_CH_CFG_MASK_EXT_FLOW_SPEC;
}
*pp_peer_cfg = &(p_ccb->peer_cfg);
*p_peer_cfg_bits = p_ccb->peer_cfg_bits;
return TRUE;
} else {
L2CAP_TRACE_ERROR ("No CCB for CID:0x%04x", lcid);
return FALSE;
}
}
/*******************************************************************************
**
** Function L2CA_RegForNoCPEvt
**
** Description Register callback for Number of Completed Packets event.
**
** Input Param p_cb - callback for Number of completed packets event
** p_bda - BT address of remote device
**
** Returns TRUE if registered OK, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_RegForNoCPEvt(tL2CA_NOCP_CB *p_cb, BD_ADDR p_bda)
{
tL2C_LCB *p_lcb;
/* Find the link that is associated with this remote bdaddr */
p_lcb = l2cu_find_lcb_by_bd_addr (p_bda, BT_TRANSPORT_BR_EDR);
/* If no link for this handle, nothing to do. */
if (!p_lcb) {
return FALSE;
}
p_lcb->p_nocp_cb = p_cb;
return TRUE;
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function L2CA_DataWrite
**
** Description Higher layers call this function to write data.
**
** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
** L2CAP_DW_FAILED, if error
**
*******************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
UINT8 L2CA_DataWrite (UINT16 cid, BT_HDR *p_data)
{
L2CAP_TRACE_API ("L2CA_DataWrite() CID: 0x%04x Len: %d", cid, p_data->len);
return l2c_data_write (cid, p_data, L2CAP_FLUSHABLE_CH_BASED);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function L2CA_SetChnlFlushability
**
** Description Higher layers call this function to set a channels
** flushability flags
**
** Returns TRUE if CID found, else FALSE
**
*******************************************************************************/
BOOLEAN L2CA_SetChnlFlushability (UINT16 cid, BOOLEAN is_flushable)
{
#if (L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE)
tL2C_CCB *p_ccb;
/* Find the channel control block. We don't know the link it is on. */
if ((p_ccb = l2cu_find_ccb_by_cid (NULL, cid)) == NULL) {
L2CAP_TRACE_WARNING ("L2CAP - no CCB for L2CA_SetChnlFlushability, CID: %d", cid);
return (FALSE);
}
p_ccb->is_flushable = is_flushable;
L2CAP_TRACE_API ("L2CA_SetChnlFlushability() CID: 0x%04x is_flushable: %d", cid, is_flushable);
#endif
return (TRUE);
}
/*******************************************************************************
**
** Function L2CA_DataWriteEx
**
** Description Higher layers call this function to write data with extended
** flags.
** flags : L2CAP_FLUSHABLE_CH_BASED
** L2CAP_FLUSHABLE_PKT
** L2CAP_NON_FLUSHABLE_PKT
**
** Returns L2CAP_DW_SUCCESS, if data accepted, else FALSE
** L2CAP_DW_CONGESTED, if data accepted and the channel is congested
** L2CAP_DW_FAILED, if error
**
*******************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
UINT8 L2CA_DataWriteEx (UINT16 cid, BT_HDR *p_data, UINT16 flags)
{
L2CAP_TRACE_API ("L2CA_DataWriteEx() CID: 0x%04x Len: %d Flags:0x%04X",
cid, p_data->len, flags);
return l2c_data_write (cid, p_data, flags);
}
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function L2CA_FlushChannel
**
** Description This function flushes none, some or all buffers queued up
** for xmission for a particular CID. If called with
** L2CAP_FLUSH_CHANS_GET (0), it simply returns the number
** of buffers queued for that CID L2CAP_FLUSH_CHANS_ALL (0xffff)
** flushes all buffers. All other values specifies the maximum
** buffers to flush.
**
** Returns Number of buffers left queued for that CID
**
*******************************************************************************/
UINT16 L2CA_FlushChannel (UINT16 lcid, UINT16 num_to_flush)
{
tL2C_CCB *p_ccb;
tL2C_LCB *p_lcb;
UINT16 num_left = 0,
num_flushed1 = 0,
num_flushed2 = 0;
p_ccb = l2cu_find_ccb_by_cid(NULL, lcid);
if ( !p_ccb || ((p_lcb = p_ccb->p_lcb) == NULL) ) {
L2CAP_TRACE_WARNING ("L2CA_FlushChannel() abnormally returning 0 CID: 0x%04x", lcid);
return (0);
}
if (num_to_flush != L2CAP_FLUSH_CHANS_GET) {
L2CAP_TRACE_API ("L2CA_FlushChannel (FLUSH) CID: 0x%04x NumToFlush: %d QC: %u pFirst: %p",
lcid, num_to_flush, GKI_queue_length(&p_ccb->xmit_hold_q), GKI_getfirst(&p_ccb->xmit_hold_q));
} else {
L2CAP_TRACE_API ("L2CA_FlushChannel (QUERY) CID: 0x%04x", lcid);
}
/* Cannot flush eRTM buffers once they have a sequence number */
if (p_ccb->peer_cfg.fcr.mode != L2CAP_FCR_ERTM_MODE) {
#if L2CAP_NON_FLUSHABLE_PB_INCLUDED == TRUE
if (num_to_flush != L2CAP_FLUSH_CHANS_GET) {
/* If the controller supports enhanced flush, flush the data queued at the controller */
if ( (HCI_NON_FLUSHABLE_PB_SUPPORTED(BTM_ReadLocalFeatures ()))
&& (BTM_GetNumScoLinks() == 0) ) {
if ( l2cb.is_flush_active == FALSE ) {
l2cb.is_flush_active = TRUE;
/* The only packet type defined - 0 - Automatically-Flushable Only */
btsnd_hcic_enhanced_flush (p_lcb->handle, 0);
}
}
}
#endif
// Iterate though list and flush the amount requested from
// the transmit data queue that satisfy the layer and event conditions.
for (const list_node_t *node = list_begin(p_lcb->link_xmit_data_q);
(num_to_flush > 0) && node != list_end(p_lcb->link_xmit_data_q);) {
BT_HDR *p_buf = (BT_HDR *)list_node(node);
node = list_next(node);
if ((p_buf->layer_specific == 0) && (p_buf->event == lcid)) {
num_to_flush--;
num_flushed1++;
list_remove(p_lcb->link_xmit_data_q, p_buf);
GKI_freebuf(p_buf);
}
}
}
/* If needed, flush buffers in the CCB xmit hold queue */
while ( (num_to_flush != 0) && (!GKI_queue_is_empty(&p_ccb->xmit_hold_q))) {
BT_HDR *p_buf = (BT_HDR *)GKI_dequeue (&p_ccb->xmit_hold_q);
if (p_buf) {
GKI_freebuf (p_buf);
}
num_to_flush--;
num_flushed2++;
}
/* If app needs to track all packets, call him */
if ( (p_ccb->p_rcb) && (p_ccb->p_rcb->api.pL2CA_TxComplete_Cb) && (num_flushed2) ) {
(*p_ccb->p_rcb->api.pL2CA_TxComplete_Cb)(p_ccb->local_cid, num_flushed2);
}
/* Now count how many are left */
for (const list_node_t *node = list_begin(p_lcb->link_xmit_data_q);
node != list_end(p_lcb->link_xmit_data_q);
node = list_next(node)) {
BT_HDR *p_buf = (BT_HDR *)list_node(node);
if (p_buf->event == lcid) {
num_left++;
}
}
/* Add in the number in the CCB xmit queue */
num_left += GKI_queue_length(&p_ccb->xmit_hold_q);
/* Return the local number of buffers left for the CID */
L2CAP_TRACE_DEBUG ("L2CA_FlushChannel() flushed: %u + %u, num_left: %u", num_flushed1, num_flushed2, num_left);
/* If we were congested, and now we are not, tell the app */
l2cu_check_channel_congestion (p_ccb);
return (num_left);
}
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