| /****************************************************************************** |
| * |
| * Copyright (C) 2004-2012 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 PAN main functions and state machine. |
| * |
| ******************************************************************************/ |
| |
| #include "bt_target.h" |
| |
| #if (BTA_PAN_INCLUDED == TRUE) |
| |
| #include <string.h> |
| |
| #include "bt_common.h" |
| #include "bta_api.h" |
| #include "bta_pan_api.h" |
| #include "bta_pan_int.h" |
| #include "bta_sys.h" |
| #include "osi/include/osi.h" |
| #include "pan_api.h" |
| #include "utl.h" |
| |
| /***************************************************************************** |
| * Constants and types |
| ****************************************************************************/ |
| |
| /* state machine action enumeration list */ |
| enum { |
| BTA_PAN_API_CLOSE, |
| BTA_PAN_TX_PATH, |
| BTA_PAN_RX_PATH, |
| BTA_PAN_TX_FLOW, |
| BTA_PAN_WRITE_BUF, |
| BTA_PAN_CONN_OPEN, |
| BTA_PAN_CONN_CLOSE, |
| BTA_PAN_FREE_BUF, |
| BTA_PAN_IGNORE |
| }; |
| |
| /* type for action functions */ |
| typedef void (*tBTA_PAN_ACTION)(tBTA_PAN_SCB* p_scb, tBTA_PAN_DATA* p_data); |
| |
| /* action function list */ |
| const tBTA_PAN_ACTION bta_pan_action[] = { |
| bta_pan_api_close, bta_pan_tx_path, bta_pan_rx_path, bta_pan_tx_flow, |
| bta_pan_write_buf, bta_pan_conn_open, bta_pan_conn_close, bta_pan_free_buf, |
| |
| }; |
| |
| /* state table information */ |
| #define BTA_PAN_ACTIONS 1 /* number of actions */ |
| #define BTA_PAN_NEXT_STATE 1 /* position of next state */ |
| #define BTA_PAN_NUM_COLS 2 /* number of columns in state tables */ |
| |
| /* state table for listen state */ |
| const uint8_t bta_pan_st_idle[][BTA_PAN_NUM_COLS] = { |
| /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_IDLE_ST}, |
| /* CI_TX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* CI_RX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* CI_TX_FLOW */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* CI_RX_WRITEBUF */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* PAN_CONN_OPEN */ {BTA_PAN_CONN_OPEN, BTA_PAN_OPEN_ST}, |
| /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_OPEN, BTA_PAN_IDLE_ST}, |
| /* FLOW_ENABLE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, |
| /* BNEP_DATA */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST} |
| |
| }; |
| |
| /* state table for open state */ |
| const uint8_t bta_pan_st_open[][BTA_PAN_NUM_COLS] = { |
| /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_OPEN_ST}, |
| /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}, |
| /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, |
| /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_OPEN_ST}, |
| /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, |
| /* CI_RX_WRITEBUF */ {BTA_PAN_WRITE_BUF, BTA_PAN_OPEN_ST}, |
| /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, |
| /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, |
| /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, |
| /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}}; |
| |
| /* state table for closing state */ |
| const uint8_t bta_pan_st_closing[][BTA_PAN_NUM_COLS] = { |
| /* API_CLOSE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, |
| /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}, |
| /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, |
| /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_CLOSING_ST}, |
| /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, |
| /* CI_RX_WRITEBUF */ {BTA_PAN_FREE_BUF, BTA_PAN_CLOSING_ST}, |
| /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, |
| /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, |
| /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, |
| /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}}; |
| |
| /* type for state table */ |
| typedef const uint8_t (*tBTA_PAN_ST_TBL)[BTA_PAN_NUM_COLS]; |
| |
| /* state table */ |
| const tBTA_PAN_ST_TBL bta_pan_st_tbl[] = {bta_pan_st_idle, bta_pan_st_open, |
| bta_pan_st_closing}; |
| |
| /***************************************************************************** |
| * Global data |
| ****************************************************************************/ |
| |
| /* PAN control block */ |
| tBTA_PAN_CB bta_pan_cb; |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_scb_alloc |
| * |
| * Description Allocate a PAN server control block. |
| * |
| * |
| * Returns pointer to the scb, or NULL if none could be allocated. |
| * |
| ******************************************************************************/ |
| tBTA_PAN_SCB* bta_pan_scb_alloc(void) { |
| tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0]; |
| int i; |
| |
| for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { |
| if (!p_scb->in_use) { |
| p_scb->in_use = true; |
| APPL_TRACE_DEBUG("bta_pan_scb_alloc %d", i); |
| break; |
| } |
| } |
| |
| if (i == BTA_PAN_NUM_CONN) { |
| /* out of scbs */ |
| p_scb = NULL; |
| APPL_TRACE_WARNING("Out of scbs"); |
| } |
| return p_scb; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_sm_execute |
| * |
| * Description State machine event handling function for PAN |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void bta_pan_sm_execute(tBTA_PAN_SCB* p_scb, uint16_t event, |
| tBTA_PAN_DATA* p_data) { |
| tBTA_PAN_ST_TBL state_table; |
| uint8_t action; |
| int i; |
| |
| APPL_TRACE_EVENT("PAN scb=%d event=0x%x state=%d", bta_pan_scb_to_idx(p_scb), |
| event, p_scb->state); |
| |
| /* look up the state table for the current state */ |
| state_table = bta_pan_st_tbl[p_scb->state]; |
| |
| event &= 0x00FF; |
| |
| /* set next state */ |
| p_scb->state = state_table[event][BTA_PAN_NEXT_STATE]; |
| |
| /* execute action functions */ |
| for (i = 0; i < BTA_PAN_ACTIONS; i++) { |
| action = state_table[event][i]; |
| if (action != BTA_PAN_IGNORE) { |
| (*bta_pan_action[action])(p_scb, p_data); |
| } else { |
| break; |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_api_enable |
| * |
| * Description Handle an API enable event. |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void bta_pan_api_enable(tBTA_PAN_DATA* p_data) { |
| /* initialize control block */ |
| memset(&bta_pan_cb, 0, sizeof(bta_pan_cb)); |
| |
| /* store callback function */ |
| bta_pan_cb.p_cback = p_data->api_enable.p_cback; |
| bta_pan_enable(p_data); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_api_disable |
| * |
| * Description Handle an API disable event. |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void bta_pan_api_disable(UNUSED_ATTR tBTA_PAN_DATA* p_data) { |
| bta_pan_disable(); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_api_open |
| * |
| * Description Handle an API listen event. |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void bta_pan_api_open(tBTA_PAN_DATA* p_data) { |
| tBTA_PAN_SCB* p_scb; |
| tBTA_PAN_OPEN data; |
| |
| /* allocate an scb */ |
| p_scb = bta_pan_scb_alloc(); |
| if (p_scb != NULL) { |
| bta_pan_open(p_scb, p_data); |
| } else { |
| bdcpy(data.bd_addr, p_data->api_open.bd_addr); |
| data.status = BTA_PAN_FAIL; |
| bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, (tBTA_PAN*)&data); |
| } |
| } |
| /******************************************************************************* |
| * |
| * Function bta_pan_scb_dealloc |
| * |
| * Description Deallocate a link control block. |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| void bta_pan_scb_dealloc(tBTA_PAN_SCB* p_scb) { |
| APPL_TRACE_DEBUG("bta_pan_scb_dealloc %d", bta_pan_scb_to_idx(p_scb)); |
| fixed_queue_free(p_scb->data_queue, NULL); |
| memset(p_scb, 0, sizeof(tBTA_PAN_SCB)); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_scb_to_idx |
| * |
| * Description Given a pointer to an scb, return its index. |
| * |
| * |
| * Returns Index of scb. |
| * |
| ******************************************************************************/ |
| uint8_t bta_pan_scb_to_idx(tBTA_PAN_SCB* p_scb) { |
| return ((uint8_t)(p_scb - bta_pan_cb.scb)) + 1; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_scb_by_handle |
| * |
| * Description Find scb associated with handle. |
| * |
| * |
| * Returns Pointer to scb or NULL if not found. |
| * |
| ******************************************************************************/ |
| tBTA_PAN_SCB* bta_pan_scb_by_handle(uint16_t handle) { |
| tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0]; |
| uint8_t i; |
| |
| for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { |
| if (p_scb->handle == handle) { |
| return p_scb; |
| ; |
| } |
| } |
| |
| APPL_TRACE_WARNING("No scb for handle %d", handle); |
| |
| return NULL; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function bta_pan_hdl_event |
| * |
| * Description Data gateway main event handling function. |
| * |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| bool bta_pan_hdl_event(BT_HDR* p_msg) { |
| tBTA_PAN_SCB* p_scb; |
| bool freebuf = true; |
| |
| switch (p_msg->event) { |
| /* handle enable event */ |
| case BTA_PAN_API_ENABLE_EVT: |
| bta_pan_api_enable((tBTA_PAN_DATA*)p_msg); |
| break; |
| |
| /* handle disable event */ |
| case BTA_PAN_API_DISABLE_EVT: |
| bta_pan_api_disable((tBTA_PAN_DATA*)p_msg); |
| break; |
| |
| /* handle set role event */ |
| case BTA_PAN_API_SET_ROLE_EVT: |
| bta_pan_set_role((tBTA_PAN_DATA*)p_msg); |
| break; |
| |
| /* handle open event */ |
| case BTA_PAN_API_OPEN_EVT: |
| bta_pan_api_open((tBTA_PAN_DATA*)p_msg); |
| break; |
| |
| /* events that require buffer not be released */ |
| case BTA_PAN_CI_RX_WRITEBUF_EVT: |
| freebuf = false; |
| p_scb = bta_pan_scb_by_handle(p_msg->layer_specific); |
| if (p_scb != NULL) { |
| bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg); |
| } |
| break; |
| |
| /* all other events */ |
| default: |
| p_scb = bta_pan_scb_by_handle(p_msg->layer_specific); |
| if (p_scb != NULL) { |
| bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg); |
| } |
| break; |
| } |
| return freebuf; |
| } |
| #endif /* BTA_PAN_INCLUDED */ |