/******************************************************************************
*
* Copyright (C) 2008-2012 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 main GATT server attributes access request
* handling functions.
*
******************************************************************************/
#include "bt_target.h"
#include "bt_utils.h"
#include "btcore/include/uuid.h"
#include "gatt_api.h"
#include "gatt_int.h"
#include "osi/include/osi.h"
#define GATTP_MAX_NUM_INC_SVR 0
#define GATTP_MAX_CHAR_NUM 2
#define GATTP_MAX_ATTR_NUM (GATTP_MAX_CHAR_NUM * 2 + GATTP_MAX_NUM_INC_SVR + 1)
#define GATTP_MAX_CHAR_VALUE_SIZE 50
#ifndef GATTP_ATTR_DB_SIZE
#define GATTP_ATTR_DB_SIZE \
GATT_DB_MEM_SIZE(GATTP_MAX_NUM_INC_SVR, GATTP_MAX_CHAR_NUM, \
GATTP_MAX_CHAR_VALUE_SIZE)
#endif
static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id,
uint8_t op_code, tGATTS_DATA* p_data);
static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, BD_ADDR bda,
uint16_t conn_id, bool connected,
tGATT_DISCONN_REASON reason,
tBT_TRANSPORT transport);
static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
tGATT_DISC_RES* p_data);
static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
tGATT_STATUS status);
static void gatt_cl_op_cmpl_cback(UNUSED_ATTR uint16_t conn_id,
UNUSED_ATTR tGATTC_OPTYPE op,
UNUSED_ATTR tGATT_STATUS status,
UNUSED_ATTR tGATT_CL_COMPLETE* p_data);
static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb);
static tGATT_CBACK gatt_profile_cback = {gatt_connect_cback,
gatt_cl_op_cmpl_cback,
gatt_disc_res_cback,
gatt_disc_cmpl_cback,
gatt_request_cback,
NULL,
NULL,
NULL,
NULL};
/*******************************************************************************
*
* Function gatt_profile_find_conn_id_by_bd_addr
*
* Description Find the connection ID by remote address
*
* Returns Connection ID
*
******************************************************************************/
uint16_t gatt_profile_find_conn_id_by_bd_addr(BD_ADDR remote_bda) {
uint16_t conn_id = GATT_INVALID_CONN_ID;
GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id,
BT_TRANSPORT_LE);
return conn_id;
}
/*******************************************************************************
*
* Function gatt_profile_find_clcb_by_conn_id
*
* Description find clcb by Connection ID
*
* Returns Pointer to the found link conenction control block.
*
******************************************************************************/
static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_conn_id(uint16_t conn_id) {
uint8_t i_clcb;
tGATT_PROFILE_CLCB* p_clcb = NULL;
for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS;
i_clcb++, p_clcb++) {
if (p_clcb->in_use && p_clcb->conn_id == conn_id) return p_clcb;
}
return NULL;
}
/*******************************************************************************
*
* Function gatt_profile_find_clcb_by_bd_addr
*
* Description The function searches all LCBs with macthing bd address.
*
* Returns Pointer to the found link conenction control block.
*
******************************************************************************/
static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_bd_addr(
BD_ADDR bda, tBT_TRANSPORT transport) {
uint8_t i_clcb;
tGATT_PROFILE_CLCB* p_clcb = NULL;
for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS;
i_clcb++, p_clcb++) {
if (p_clcb->in_use && p_clcb->transport == transport && p_clcb->connected &&
!memcmp(p_clcb->bda, bda, BD_ADDR_LEN))
return p_clcb;
}
return NULL;
}
/*******************************************************************************
*
* Function gatt_profile_clcb_alloc
*
* Description The function allocates a GATT profile connection link
* control block
*
* Returns NULL if not found. Otherwise pointer to the connection link
* block.
*
******************************************************************************/
tGATT_PROFILE_CLCB* gatt_profile_clcb_alloc(uint16_t conn_id, BD_ADDR bda,
tBT_TRANSPORT tranport) {
uint8_t i_clcb = 0;
tGATT_PROFILE_CLCB* p_clcb = NULL;
for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS;
i_clcb++, p_clcb++) {
if (!p_clcb->in_use) {
p_clcb->in_use = true;
p_clcb->conn_id = conn_id;
p_clcb->connected = true;
p_clcb->transport = tranport;
memcpy(p_clcb->bda, bda, BD_ADDR_LEN);
break;
}
}
if (i_clcb < GATT_MAX_APPS) return p_clcb;
return NULL;
}
/*******************************************************************************
*
* Function gatt_profile_clcb_dealloc
*
* Description The function deallocates a GATT profile connection link
* control block
*
* Returns void
*
******************************************************************************/
void gatt_profile_clcb_dealloc(tGATT_PROFILE_CLCB* p_clcb) {
memset(p_clcb, 0, sizeof(tGATT_PROFILE_CLCB));
}
/*******************************************************************************
*
* Function gatt_request_cback
*
* Description GATT profile attribute access request callback.
*
* Returns void.
*
******************************************************************************/
static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id,
tGATTS_REQ_TYPE type, tGATTS_DATA* p_data) {
uint8_t status = GATT_INVALID_PDU;
tGATTS_RSP rsp_msg;
bool ignore = false;
memset(&rsp_msg, 0, sizeof(tGATTS_RSP));
switch (type) {
case GATTS_REQ_TYPE_READ_CHARACTERISTIC:
case GATTS_REQ_TYPE_READ_DESCRIPTOR:
status = GATT_READ_NOT_PERMIT;
break;
case GATTS_REQ_TYPE_WRITE_CHARACTERISTIC:
case GATTS_REQ_TYPE_WRITE_DESCRIPTOR:
status = GATT_WRITE_NOT_PERMIT;
break;
case GATTS_REQ_TYPE_WRITE_EXEC:
case GATT_CMD_WRITE:
ignore = true;
GATT_TRACE_EVENT("Ignore GATT_REQ_EXEC_WRITE/WRITE_CMD");
break;
case GATTS_REQ_TYPE_MTU:
GATT_TRACE_EVENT("Get MTU exchange new mtu size: %d", p_data->mtu);
ignore = true;
break;
default:
GATT_TRACE_EVENT("Unknown/unexpected LE GAP ATT request: 0x%02x", type);
break;
}
if (!ignore) GATTS_SendRsp(conn_id, trans_id, status, &rsp_msg);
}
/*******************************************************************************
*
* Function gatt_connect_cback
*
* Description Gatt profile connection callback.
*
* Returns void
*
******************************************************************************/
static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, BD_ADDR bda,
uint16_t conn_id, bool connected,
tGATT_DISCONN_REASON reason,
tBT_TRANSPORT transport) {
GATT_TRACE_EVENT("%s: from %08x%04x connected:%d conn_id=%d reason = 0x%04x",
__func__,
(bda[0] << 24) + (bda[1] << 16) + (bda[2] << 8) + bda[3],
(bda[4] << 8) + bda[5], connected, conn_id, reason);
tGATT_PROFILE_CLCB* p_clcb =
gatt_profile_find_clcb_by_bd_addr(bda, transport);
if (p_clcb == NULL) return;
if (connected) {
p_clcb->conn_id = conn_id;
p_clcb->connected = true;
if (p_clcb->ccc_stage == GATT_SVC_CHANGED_CONNECTING) {
p_clcb->ccc_stage++;
gatt_cl_start_config_ccc(p_clcb);
}
} else {
gatt_profile_clcb_dealloc(p_clcb);
}
}
/*******************************************************************************
*
* Function gatt_profile_db_init
*
* Description Initializa the GATT profile attribute database.
*
******************************************************************************/
void gatt_profile_db_init(void) {
tBT_UUID app_uuid = {LEN_UUID_128, {0}};
uint16_t service_handle = 0;
/* Fill our internal UUID with a fixed pattern 0x81 */
memset(&app_uuid.uu.uuid128, 0x81, LEN_UUID_128);
/* Create a GATT profile service */
gatt_cb.gatt_if = GATT_Register(&app_uuid, &gatt_profile_cback);
GATT_StartIf(gatt_cb.gatt_if);
bt_uuid_t service_uuid;
uuid_128_from_16(&service_uuid, UUID_SERVCLASS_GATT_SERVER);
bt_uuid_t char_uuid;
uuid_128_from_16(&char_uuid, GATT_UUID_GATT_SRV_CHGD);
btgatt_db_element_t service[] = {
{.type = BTGATT_DB_PRIMARY_SERVICE, .uuid = service_uuid},
{.type = BTGATT_DB_CHARACTERISTIC,
.uuid = char_uuid,
.properties = GATT_CHAR_PROP_BIT_INDICATE,
.permissions = 0}};
GATTS_AddService(gatt_cb.gatt_if, service,
sizeof(service) / sizeof(btgatt_db_element_t));
service_handle = service[0].attribute_handle;
gatt_cb.handle_of_h_r = service[1].attribute_handle;
GATT_TRACE_ERROR("gatt_profile_db_init: gatt_if=%d", gatt_cb.gatt_if);
}
/*******************************************************************************
*
* Function gatt_disc_res_cback
*
* Description Gatt profile discovery result callback
*
* Returns void
*
******************************************************************************/
static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
tGATT_DISC_RES* p_data) {
tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id);
if (p_clcb == NULL) return;
switch (disc_type) {
case GATT_DISC_SRVC_BY_UUID: /* stage 1 */
p_clcb->e_handle = p_data->value.group_value.e_handle;
p_clcb->ccc_result++;
break;
case GATT_DISC_CHAR: /* stage 2 */
p_clcb->s_handle = p_data->value.dclr_value.val_handle;
p_clcb->ccc_result++;
break;
case GATT_DISC_CHAR_DSCPT: /* stage 3 */
if (p_data->type.uu.uuid16 == GATT_UUID_CHAR_CLIENT_CONFIG) {
p_clcb->s_handle = p_data->handle;
p_clcb->ccc_result++;
}
break;
}
}
/*******************************************************************************
*
* Function gatt_disc_cmpl_cback
*
* Description Gatt profile discovery complete callback
*
* Returns void
*
******************************************************************************/
static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
tGATT_STATUS status) {
tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id);
if (p_clcb == NULL) return;
if (status == GATT_SUCCESS && p_clcb->ccc_result > 0) {
p_clcb->ccc_result = 0;
p_clcb->ccc_stage++;
gatt_cl_start_config_ccc(p_clcb);
} else {
GATT_TRACE_ERROR("%s() - Unable to register for service changed indication",
__func__);
}
}
/*******************************************************************************
*
* Function gatt_cl_op_cmpl_cback
*
* Description Gatt profile client operation complete callback
*
* Returns void
*
******************************************************************************/
static void gatt_cl_op_cmpl_cback(UNUSED_ATTR uint16_t conn_id,
UNUSED_ATTR tGATTC_OPTYPE op,
UNUSED_ATTR tGATT_STATUS status,
UNUSED_ATTR tGATT_CL_COMPLETE* p_data) {}
/*******************************************************************************
*
* Function gatt_cl_start_config_ccc
*
* Description Gatt profile start configure service change CCC
*
* Returns void
*
******************************************************************************/
static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb) {
tGATT_DISC_PARAM srvc_disc_param;
tGATT_VALUE ccc_value;
GATT_TRACE_DEBUG("%s() - stage: %d", __func__, p_clcb->ccc_stage);
memset(&srvc_disc_param, 0, sizeof(tGATT_DISC_PARAM));
memset(&ccc_value, 0, sizeof(tGATT_VALUE));
switch (p_clcb->ccc_stage) {
case GATT_SVC_CHANGED_SERVICE: /* discover GATT service */
srvc_disc_param.s_handle = 1;
srvc_disc_param.e_handle = 0xffff;
srvc_disc_param.service.len = 2;
srvc_disc_param.service.uu.uuid16 = UUID_SERVCLASS_GATT_SERVER;
GATTC_Discover(p_clcb->conn_id, GATT_DISC_SRVC_BY_UUID, &srvc_disc_param);
break;
case GATT_SVC_CHANGED_CHARACTERISTIC: /* discover service change char */
srvc_disc_param.s_handle = 1;
srvc_disc_param.e_handle = p_clcb->e_handle;
srvc_disc_param.service.len = 2;
srvc_disc_param.service.uu.uuid16 = GATT_UUID_GATT_SRV_CHGD;
GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR, &srvc_disc_param);
break;
case GATT_SVC_CHANGED_DESCRIPTOR: /* discover service change ccc */
srvc_disc_param.s_handle = p_clcb->s_handle;
srvc_disc_param.e_handle = p_clcb->e_handle;
GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR_DSCPT, &srvc_disc_param);
break;
case GATT_SVC_CHANGED_CONFIGURE_CCCD: /* write ccc */
ccc_value.handle = p_clcb->s_handle;
ccc_value.len = 2;
ccc_value.value[0] = GATT_CLT_CONFIG_INDICATION;
GATTC_Write(p_clcb->conn_id, GATT_WRITE, &ccc_value);
break;
}
}
/*******************************************************************************
*
* Function GATT_ConfigServiceChangeCCC
*
* Description Configure service change indication on remote device
*
* Returns none
*
******************************************************************************/
void GATT_ConfigServiceChangeCCC(BD_ADDR remote_bda, bool enable,
tBT_TRANSPORT transport) {
tGATT_PROFILE_CLCB* p_clcb =
gatt_profile_find_clcb_by_bd_addr(remote_bda, transport);
if (p_clcb == NULL)
p_clcb = gatt_profile_clcb_alloc(0, remote_bda, transport);
if (p_clcb == NULL) return;
if (GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &p_clcb->conn_id,
transport)) {
p_clcb->connected = true;
}
/* hold the link here */
GATT_Connect(gatt_cb.gatt_if, remote_bda, true, transport, true);
p_clcb->ccc_stage = GATT_SVC_CHANGED_CONNECTING;
if (!p_clcb->connected) {
/* wait for connection */
return;
}
p_clcb->ccc_stage++;
gatt_cl_start_config_ccc(p_clcb);
}