/****************************************************************************** * * Copyright 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 file contains the GATT client main functions and state machine. * ******************************************************************************/ #include "bt_target.h" #include #include "bt_common.h" #include "bta_gattc_int.h" using base::StringPrintf; /***************************************************************************** * Constants and types ****************************************************************************/ /* state machine action enumeration list */ enum { BTA_GATTC_OPEN, BTA_GATTC_OPEN_FAIL, BTA_GATTC_OPEN_ERROR, BTA_GATTC_CANCEL_OPEN, BTA_GATTC_CANCEL_OPEN_OK, BTA_GATTC_CANCEL_OPEN_ERROR, BTA_GATTC_CONN, BTA_GATTC_START_DISCOVER, BTA_GATTC_DISC_CMPL, BTA_GATTC_Q_CMD, BTA_GATTC_CLOSE, BTA_GATTC_CLOSE_FAIL, BTA_GATTC_READ, BTA_GATTC_WRITE, BTA_GATTC_OP_CMPL, BTA_GATTC_SEARCH, BTA_GATTC_FAIL, BTA_GATTC_CONFIRM, BTA_GATTC_EXEC, BTA_GATTC_READ_MULTI, BTA_GATTC_IGNORE_OP_CMPL, BTA_GATTC_DISC_CLOSE, BTA_GATTC_RESTART_DISCOVER, BTA_GATTC_CFG_MTU, BTA_GATTC_IGNORE }; /* type for action functions */ typedef void (*tBTA_GATTC_ACTION)(tBTA_GATTC_CLCB* p_clcb, tBTA_GATTC_DATA* p_data); /* action function list */ const tBTA_GATTC_ACTION bta_gattc_action[] = { bta_gattc_open, /* BTA_GATTC_OPEN */ bta_gattc_open_fail, /* BTA_GATTC_OPEN_FAIL */ bta_gattc_open_error, /* BTA_GATTC_OPEN_ERROR */ bta_gattc_cancel_open, /* BTA_GATTC_CANCEL_OPEN */ bta_gattc_cancel_open_ok, /* BTA_GATTC_CANCEL_OPEN_OK */ bta_gattc_cancel_open_error, /* BTA_GATTC_CANCEL_OPEN_ERROR */ bta_gattc_conn, /* BTA_GATTC_CONN */ bta_gattc_start_discover, /* BTA_GATTC_START_DISCOVER */ bta_gattc_disc_cmpl, /* BTA_GATTC_DISC_CMPL */ bta_gattc_q_cmd, /* BTA_GATTC_Q_CMD */ bta_gattc_close, /* BTA_GATTC_CLOSE */ bta_gattc_close_fail, /* BTA_GATTC_CLOSE_FAIL */ bta_gattc_read, /* BTA_GATTC_READ */ bta_gattc_write, /* BTA_GATTC_WRITE */ bta_gattc_op_cmpl, /* BTA_GATTC_OP_CMPL */ bta_gattc_search, /* BTA_GATTC_SEARCH */ bta_gattc_fail, /* BTA_GATTC_FAIL */ bta_gattc_confirm, /* BTA_GATTC_CONFIRM */ bta_gattc_execute, /* BTA_GATTC_EXEC */ bta_gattc_read_multi, /* BTA_GATTC_READ_MULTI */ bta_gattc_ignore_op_cmpl, /* BTA_GATTC_IGNORE_OP_CMPL */ bta_gattc_disc_close, /* BTA_GATTC_DISC_CLOSE */ bta_gattc_restart_discover, /* BTA_GATTC_RESTART_DISCOVER */ bta_gattc_cfg_mtu /* BTA_GATTC_CFG_MTU */ }; /* state table information */ #define BTA_GATTC_ACTIONS 1 /* number of actions */ #define BTA_GATTC_NEXT_STATE 1 /* position of next state */ #define BTA_GATTC_NUM_COLS 2 /* number of columns in state tables */ /* state table for idle state */ static const uint8_t bta_gattc_st_idle[][BTA_GATTC_NUM_COLS] = { /* Event Action 1 Next state */ /* BTA_GATTC_API_OPEN_EVT */ {BTA_GATTC_OPEN, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_INT_OPEN_FAIL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_CANCEL_OPEN_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_READ_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_WRITE_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_EXEC_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_CFG_MTU_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_CLOSE_EVT */ {BTA_GATTC_CLOSE_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_SEARCH_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_CONFIRM_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_READ_MULTI_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_INT_CONN_EVT */ {BTA_GATTC_CONN, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_DISCOVER_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_DISCOVER_CMPL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_OP_CMPL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_INT_DISCONN_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_IDLE_ST}, }; /* state table for wait for open state */ static const uint8_t bta_gattc_st_w4_conn[][BTA_GATTC_NUM_COLS] = { /* Event Action 1 Next state */ /* BTA_GATTC_API_OPEN_EVT */ {BTA_GATTC_OPEN, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_INT_OPEN_FAIL_EVT */ {BTA_GATTC_OPEN_FAIL, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_CANCEL_OPEN_EVT */ {BTA_GATTC_CANCEL_OPEN, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */ {BTA_GATTC_CANCEL_OPEN_OK, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_READ_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_WRITE_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_EXEC_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_CFG_MTU_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_CLOSE_EVT */ {BTA_GATTC_CANCEL_OPEN, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_SEARCH_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_CONFIRM_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_API_READ_MULTI_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_INT_CONN_EVT */ {BTA_GATTC_CONN, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_DISCOVER_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_DISCOVER_CMPL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_OP_CMPL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_W4_CONN_ST}, /* BTA_GATTC_INT_DISCONN_EVT */ {BTA_GATTC_OPEN_FAIL, BTA_GATTC_IDLE_ST}, }; /* state table for open state */ static const uint8_t bta_gattc_st_connected[][BTA_GATTC_NUM_COLS] = { /* Event Action 1 Next state */ /* BTA_GATTC_API_OPEN_EVT */ {BTA_GATTC_OPEN, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_OPEN_FAIL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_CANCEL_OPEN_EVT */ {BTA_GATTC_CANCEL_OPEN_ERROR, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_READ_EVT */ {BTA_GATTC_READ, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_WRITE_EVT */ {BTA_GATTC_WRITE, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_EXEC_EVT */ {BTA_GATTC_EXEC, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_CFG_MTU_EVT */ {BTA_GATTC_CFG_MTU, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_CLOSE_EVT */ {BTA_GATTC_CLOSE, BTA_GATTC_IDLE_ST}, /* BTA_GATTC_API_SEARCH_EVT */ {BTA_GATTC_SEARCH, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_CONFIRM_EVT */ {BTA_GATTC_CONFIRM, BTA_GATTC_CONN_ST}, /* BTA_GATTC_API_READ_MULTI_EVT */ {BTA_GATTC_READ_MULTI, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_CONN_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_DISCOVER_EVT */ {BTA_GATTC_START_DISCOVER, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_DISCOVER_CMPL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_CONN_ST}, /* BTA_GATTC_OP_CMPL_EVT */ {BTA_GATTC_OP_CMPL, BTA_GATTC_CONN_ST}, /* BTA_GATTC_INT_DISCONN_EVT */ {BTA_GATTC_CLOSE, BTA_GATTC_IDLE_ST}, }; /* state table for discover state */ static const uint8_t bta_gattc_st_discover[][BTA_GATTC_NUM_COLS] = { /* Event Action 1 Next state */ /* BTA_GATTC_API_OPEN_EVT */ {BTA_GATTC_OPEN, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_INT_OPEN_FAIL_EVT */ {BTA_GATTC_IGNORE, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_CANCEL_OPEN_EVT */ {BTA_GATTC_CANCEL_OPEN_ERROR, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */ {BTA_GATTC_FAIL, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_READ_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_WRITE_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_EXEC_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_CFG_MTU_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_CLOSE_EVT */ {BTA_GATTC_DISC_CLOSE, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_SEARCH_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_CONFIRM_EVT */ {BTA_GATTC_CONFIRM, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_API_READ_MULTI_EVT */ {BTA_GATTC_Q_CMD, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_INT_CONN_EVT */ {BTA_GATTC_CONN, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_INT_DISCOVER_EVT */ {BTA_GATTC_RESTART_DISCOVER, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_DISCOVER_CMPL_EVT */ {BTA_GATTC_DISC_CMPL, BTA_GATTC_CONN_ST}, /* BTA_GATTC_OP_CMPL_EVT */ {BTA_GATTC_IGNORE_OP_CMPL, BTA_GATTC_DISCOVER_ST}, /* BTA_GATTC_INT_DISCONN_EVT */ {BTA_GATTC_CLOSE, BTA_GATTC_IDLE_ST}, }; /* type for state table */ typedef const uint8_t (*tBTA_GATTC_ST_TBL)[BTA_GATTC_NUM_COLS]; /* state table */ const tBTA_GATTC_ST_TBL bta_gattc_st_tbl[] = { bta_gattc_st_idle, /* BTA_GATTC_IDLE_ST */ bta_gattc_st_w4_conn, /* BTA_GATTC_W4_CONN_ST */ bta_gattc_st_connected, /* BTA_GATTC_CONN_ST */ bta_gattc_st_discover /* BTA_GATTC_DISCOVER_ST */ }; /***************************************************************************** * Global data ****************************************************************************/ /* GATTC control block */ tBTA_GATTC_CB bta_gattc_cb; #if (BTA_GATT_DEBUG == TRUE) static const char* gattc_evt_code(tBTA_GATTC_INT_EVT evt_code); static const char* gattc_state_code(tBTA_GATTC_STATE state_code); #endif /******************************************************************************* * * Function bta_gattc_sm_execute * * Description State machine event handling function for GATTC * * * Returns bool : true if queued client request buffer can be * immediately released, else false * ******************************************************************************/ bool bta_gattc_sm_execute(tBTA_GATTC_CLCB* p_clcb, uint16_t event, tBTA_GATTC_DATA* p_data) { tBTA_GATTC_ST_TBL state_table; uint8_t action; int i; bool rt = true; tBTA_GATTC_STATE in_state = p_clcb->state; uint16_t in_event = event; #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << StringPrintf("%s: State 0x%02x [%s], Event 0x%x[%s]", __func__, in_state, gattc_state_code(in_state), in_event, gattc_evt_code(in_event)); #else VLOG(1) << StringPrintf("%s: State 0x%02x, Event 0x%x", __func__, in_state, in_event); #endif /* look up the state table for the current state */ state_table = bta_gattc_st_tbl[p_clcb->state]; event &= 0x00FF; /* set next state */ p_clcb->state = state_table[event][BTA_GATTC_NEXT_STATE]; /* execute action functions */ for (i = 0; i < BTA_GATTC_ACTIONS; i++) { action = state_table[event][i]; if (action != BTA_GATTC_IGNORE) { (*bta_gattc_action[action])(p_clcb, p_data); if (p_clcb->p_q_cmd == p_data) { /* buffer is queued, don't free in the bta dispatcher. * we free it ourselves when a completion event is received. */ rt = false; } } else { break; } } #if (BTA_GATT_DEBUG == TRUE) if (in_state != p_clcb->state) { VLOG(1) << StringPrintf("GATTC State Change: [%s] -> [%s] after Event [%s]", gattc_state_code(in_state), gattc_state_code(p_clcb->state), gattc_evt_code(in_event)); } #else VLOG(1) << StringPrintf( "%s: GATTC State Change: 0x%02x -> 0x%02x after Event 0x%x", __func__, in_state, p_clcb->state, in_event); #endif return rt; } /******************************************************************************* * * Function bta_gattc_hdl_event * * Description GATT client main event handling function. * * * Returns bool * ******************************************************************************/ bool bta_gattc_hdl_event(BT_HDR* p_msg) { tBTA_GATTC_CLCB* p_clcb = NULL; bool rt = true; #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << __func__ << ": Event:" << gattc_evt_code(p_msg->event); #endif switch (p_msg->event) { case BTA_GATTC_API_OPEN_EVT: bta_gattc_process_api_open((tBTA_GATTC_DATA*)p_msg); break; case BTA_GATTC_API_CANCEL_OPEN_EVT: bta_gattc_process_api_open_cancel((tBTA_GATTC_DATA*)p_msg); break; default: if (p_msg->event == BTA_GATTC_INT_CONN_EVT) p_clcb = bta_gattc_find_int_conn_clcb((tBTA_GATTC_DATA*)p_msg); else if (p_msg->event == BTA_GATTC_INT_DISCONN_EVT) p_clcb = bta_gattc_find_int_disconn_clcb((tBTA_GATTC_DATA*)p_msg); else p_clcb = bta_gattc_find_clcb_by_conn_id(p_msg->layer_specific); if (p_clcb != NULL) { rt = bta_gattc_sm_execute(p_clcb, p_msg->event, (tBTA_GATTC_DATA*)p_msg); } else { VLOG(1) << "Ignore unknown conn ID: " << +p_msg->layer_specific; } break; } return rt; } /***************************************************************************** * Debug Functions ****************************************************************************/ #if (BTA_GATT_DEBUG == TRUE) /******************************************************************************* * * Function gattc_evt_code * * Description * * Returns void * ******************************************************************************/ static const char* gattc_evt_code(tBTA_GATTC_INT_EVT evt_code) { switch (evt_code) { case BTA_GATTC_API_OPEN_EVT: return "BTA_GATTC_API_OPEN_EVT"; case BTA_GATTC_INT_OPEN_FAIL_EVT: return "BTA_GATTC_INT_OPEN_FAIL_EVT"; case BTA_GATTC_API_CANCEL_OPEN_EVT: return "BTA_GATTC_API_CANCEL_OPEN_EVT"; case BTA_GATTC_INT_CANCEL_OPEN_OK_EVT: return "BTA_GATTC_INT_CANCEL_OPEN_OK_EVT"; case BTA_GATTC_API_READ_EVT: return "BTA_GATTC_API_READ_EVT"; case BTA_GATTC_API_WRITE_EVT: return "BTA_GATTC_API_WRITE_EVT"; case BTA_GATTC_API_EXEC_EVT: return "BTA_GATTC_API_EXEC_EVT"; case BTA_GATTC_API_CLOSE_EVT: return "BTA_GATTC_API_CLOSE_EVT"; case BTA_GATTC_API_SEARCH_EVT: return "BTA_GATTC_API_SEARCH_EVT"; case BTA_GATTC_API_CONFIRM_EVT: return "BTA_GATTC_API_CONFIRM_EVT"; case BTA_GATTC_API_READ_MULTI_EVT: return "BTA_GATTC_API_READ_MULTI_EVT"; case BTA_GATTC_INT_CONN_EVT: return "BTA_GATTC_INT_CONN_EVT"; case BTA_GATTC_INT_DISCOVER_EVT: return "BTA_GATTC_INT_DISCOVER_EVT"; case BTA_GATTC_DISCOVER_CMPL_EVT: return "BTA_GATTC_DISCOVER_CMPL_EVT"; case BTA_GATTC_OP_CMPL_EVT: return "BTA_GATTC_OP_CMPL_EVT"; case BTA_GATTC_INT_DISCONN_EVT: return "BTA_GATTC_INT_DISCONN_EVT"; case BTA_GATTC_API_CFG_MTU_EVT: return "BTA_GATTC_API_CFG_MTU_EVT"; default: return "unknown GATTC event code"; } } /******************************************************************************* * * Function gattc_state_code * * Description * * Returns void * ******************************************************************************/ static const char* gattc_state_code(tBTA_GATTC_STATE state_code) { switch (state_code) { case BTA_GATTC_IDLE_ST: return "GATTC_IDLE_ST"; case BTA_GATTC_W4_CONN_ST: return "GATTC_W4_CONN_ST"; case BTA_GATTC_CONN_ST: return "GATTC_CONN_ST"; case BTA_GATTC_DISCOVER_ST: return "GATTC_DISCOVER_ST"; default: return "unknown GATTC state code"; } } #endif /* Debug Functions */