path: root/stack/gatt/gatt_attr.c

/******************************************************************************
 *
 *  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 "gatt_api.h"
#include "gatt_int.h"

#if BLE_INCLUDED == TRUE

#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 conn_id, UINT32 trans_id, UINT8 op_code, tGATTS_DATA *p_data);
static void gatt_connect_cback(tGATT_IF gatt_if, BD_ADDR bda, UINT16 conn_id, BOOLEAN connected,
              tGATT_DISCONN_REASON reason, tBT_TRANSPORT transport);
static void gatt_disc_res_cback(UINT16 conn_id, tGATT_DISC_TYPE disc_type, tGATT_DISC_RES *p_data);
static void gatt_disc_cmpl_cback(UINT16 conn_id, tGATT_DISC_TYPE disc_type, tGATT_STATUS status);
static void gatt_cl_op_cmpl_cback(UINT16 conn_id, tGATTC_OPTYPE op, tGATT_STATUS status,
              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
} ;

/*******************************************************************************
**
** Function         gatt_profile_find_conn_id_by_bd_addr
**
** Description      Find the connection ID by remote address
**
** Returns          Connection ID
**
*******************************************************************************/
UINT16 gatt_profile_find_conn_id_by_bd_addr(BD_ADDR remote_bda)
{
    UINT16 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 conn_id)
{
    UINT8 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 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 conn_id, BD_ADDR bda, tBT_TRANSPORT tranport)
{
    UINT8                   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 conn_id, UINT32 trans_id, tGATTS_REQ_TYPE type,
                                        tGATTS_DATA *p_data)
{
    UINT8       status = GATT_INVALID_PDU;
    tGATTS_RSP   rsp_msg ;
    BOOLEAN     ignore = FALSE;

    memset(&rsp_msg, 0, sizeof(tGATTS_RSP));

    switch (type)
    {
        case GATTS_REQ_TYPE_READ:
            status = GATT_READ_NOT_PERMIT;
            break;

        case GATTS_REQ_TYPE_WRITE:
            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 (tGATT_IF gatt_if, BD_ADDR bda, UINT16 conn_id,
                                        BOOLEAN connected, tGATT_DISCONN_REASON reason,
                                        tBT_TRANSPORT transport)
{
    UNUSED(gatt_if);

    GATT_TRACE_EVENT ("%s: from %08x%04x connected:%d conn_id=%d reason = 0x%04x", __FUNCTION__,
                       (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}};
    tBT_UUID          uuid = {LEN_UUID_16, {UUID_SERVCLASS_GATT_SERVER}};
    UINT16            service_handle = 0;
    tGATT_STATUS      status;

    /* 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);

    service_handle = GATTS_CreateService (gatt_cb.gatt_if , &uuid, 0, GATTP_MAX_ATTR_NUM, TRUE);
    /* add Service Changed characteristic
    */
    uuid.uu.uuid16 = gatt_cb.gattp_attr.uuid = GATT_UUID_GATT_SRV_CHGD;
    gatt_cb.gattp_attr.service_change = 0;
    gatt_cb.gattp_attr.handle   =
    gatt_cb.handle_of_h_r       = GATTS_AddCharacteristic(service_handle, &uuid, 0, GATT_CHAR_PROP_BIT_INDICATE);

    GATT_TRACE_DEBUG ("gatt_profile_db_init:  handle of service changed%d",
                       gatt_cb.handle_of_h_r  );

    /* start service
    */
    status = GATTS_StartService (gatt_cb.gatt_if, service_handle, GATTP_TRANSPORT_SUPPORTED );

    GATT_TRACE_DEBUG ("gatt_profile_db_init:  gatt_if=%d   start status%d",
                       gatt_cb.gatt_if,  status);
}

/*******************************************************************************
**
** Function         gatt_config_ccc_complete
**
** Description      The function finish the service change ccc configuration
**
** Returns          void
**
*******************************************************************************/
static void gatt_config_ccc_complete(tGATT_PROFILE_CLCB *p_clcb)
{
    GATT_Disconnect(p_clcb->conn_id);
    gatt_profile_clcb_dealloc(p_clcb);
}

/*******************************************************************************
**
** Function         gatt_disc_res_cback
**
** Description      Gatt profile discovery result callback
**
** Returns          void
**
*******************************************************************************/
static void gatt_disc_res_cback (UINT16 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 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() - Register for service changed indication failure", __FUNCTION__);
        /* free the connection */
        gatt_config_ccc_complete (p_clcb);
    }
}

/*******************************************************************************
**
** Function         gatt_cl_op_cmpl_cback
**
** Description      Gatt profile client operation complete callback
**
** Returns          void
**
*******************************************************************************/
static void gatt_cl_op_cmpl_cback (UINT16 conn_id, tGATTC_OPTYPE op,
                                           tGATT_STATUS status, tGATT_CL_COMPLETE *p_data)
{
    tGATT_PROFILE_CLCB *p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id);

    if (p_clcb == NULL)
        return;

    if (op == GATTC_OPTYPE_WRITE)
    {
        GATT_TRACE_DEBUG("%s() - ccc write status : %d", __FUNCTION__, status);
    }

    /* Do not disconnect in case of notification or Indication (Unexpected events)*/
    if (op == GATTC_OPTYPE_NOTIFICATION || op == GATTC_OPTYPE_INDICATION)
    {
        GATT_TRACE_DEBUG("%s: Unexpected event received. Ignore", __func__);
        return;
    }

    /* free the connection */
    gatt_config_ccc_complete (p_clcb);
}

/*******************************************************************************
**
** 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", __FUNCTION__, 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;
        if (GATTC_Discover (p_clcb->conn_id, GATT_DISC_SRVC_BY_UUID, &srvc_disc_param) != GATT_SUCCESS)
        {
            GATT_TRACE_ERROR("%s() - ccc service error", __FUNCTION__);
            gatt_config_ccc_complete(p_clcb);
        }
        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;
        if (GATTC_Discover (p_clcb->conn_id, GATT_DISC_CHAR, &srvc_disc_param) != GATT_SUCCESS)
        {
            GATT_TRACE_ERROR("%s() - ccc char error", __FUNCTION__);
            gatt_config_ccc_complete(p_clcb);
        }
        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;
        if (GATTC_Discover (p_clcb->conn_id, GATT_DISC_CHAR_DSCPT, &srvc_disc_param) != GATT_SUCCESS)
        {
            GATT_TRACE_ERROR("%s() - ccc char descriptor error", __FUNCTION__);
            gatt_config_ccc_complete(p_clcb);
        }
        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;
        if (GATTC_Write (p_clcb->conn_id, GATT_WRITE, &ccc_value) != GATT_SUCCESS)
        {
            GATT_TRACE_ERROR("%s() - write ccc error", __FUNCTION__);
            gatt_config_ccc_complete(p_clcb);
        }
        break;
    }
}

/*******************************************************************************
**
** Function         GATT_ConfigServiceChangeCCC
**
** Description      Configure service change indication on remote device
**
** Returns          none
**
*******************************************************************************/
void GATT_ConfigServiceChangeCCC (BD_ADDR remote_bda, BOOLEAN enable, tBT_TRANSPORT transport)
{
    UINT16              conn_id = GATT_INVALID_CONN_ID;
    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);
    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);
}

#endif  /* BLE_INCLUDED */