1 /****************************************************************************** 2 * 3 * Copyright 2004-2012 Broadcom Corporation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 /****************************************************************************** 20 * 21 * This file contains the PAN main functions and state machine. 22 * 23 ******************************************************************************/ 24 25 #include "bt_target.h" 26 27 #if (BTA_PAN_INCLUDED == TRUE) 28 29 #include <string.h> 30 31 #include "bt_common.h" 32 #include "bta_api.h" 33 #include "bta_pan_api.h" 34 #include "bta_pan_int.h" 35 #include "bta_sys.h" 36 #include "osi/include/osi.h" 37 #include "pan_api.h" 38 #include "utl.h" 39 40 /***************************************************************************** 41 * Constants and types 42 ****************************************************************************/ 43 44 /* state machine action enumeration list */ 45 enum { 46 BTA_PAN_API_CLOSE, 47 BTA_PAN_TX_PATH, 48 BTA_PAN_RX_PATH, 49 BTA_PAN_TX_FLOW, 50 BTA_PAN_WRITE_BUF, 51 BTA_PAN_CONN_OPEN, 52 BTA_PAN_CONN_CLOSE, 53 BTA_PAN_FREE_BUF, 54 BTA_PAN_IGNORE, 55 BTA_PAN_MAX_ACTIONS 56 }; 57 58 /* type for action functions */ 59 typedef void (*tBTA_PAN_ACTION)(tBTA_PAN_SCB* p_scb, tBTA_PAN_DATA* p_data); 60 61 /* action function list */ 62 const tBTA_PAN_ACTION bta_pan_action[] = { 63 bta_pan_api_close, bta_pan_tx_path, bta_pan_rx_path, bta_pan_tx_flow, 64 bta_pan_write_buf, bta_pan_conn_open, bta_pan_conn_close, bta_pan_free_buf, 65 66 }; 67 68 /* state table information */ 69 #define BTA_PAN_ACTIONS 1 /* number of actions */ 70 #define BTA_PAN_NEXT_STATE 1 /* position of next state */ 71 #define BTA_PAN_NUM_COLS 2 /* number of columns in state tables */ 72 73 /* state table for listen state */ 74 const uint8_t bta_pan_st_idle[][BTA_PAN_NUM_COLS] = { 75 /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_IDLE_ST}, 76 /* CI_TX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 77 /* CI_RX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 78 /* CI_TX_FLOW */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 79 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 80 /* CI_RX_WRITEBUF */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 81 /* PAN_CONN_OPEN */ {BTA_PAN_CONN_OPEN, BTA_PAN_OPEN_ST}, 82 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_OPEN, BTA_PAN_IDLE_ST}, 83 /* FLOW_ENABLE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 84 /* BNEP_DATA */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST} 85 86 }; 87 88 /* state table for open state */ 89 const uint8_t bta_pan_st_open[][BTA_PAN_NUM_COLS] = { 90 /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_OPEN_ST}, 91 /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}, 92 /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, 93 /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_OPEN_ST}, 94 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, 95 /* CI_RX_WRITEBUF */ {BTA_PAN_WRITE_BUF, BTA_PAN_OPEN_ST}, 96 /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, 97 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, 98 /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, 99 /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}}; 100 101 /* state table for closing state */ 102 const uint8_t bta_pan_st_closing[][BTA_PAN_NUM_COLS] = { 103 /* API_CLOSE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 104 /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}, 105 /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, 106 /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_CLOSING_ST}, 107 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 108 /* CI_RX_WRITEBUF */ {BTA_PAN_FREE_BUF, BTA_PAN_CLOSING_ST}, 109 /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 110 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, 111 /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, 112 /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}}; 113 114 /* type for state table */ 115 typedef const uint8_t (*tBTA_PAN_ST_TBL)[BTA_PAN_NUM_COLS]; 116 117 /* state table */ 118 const tBTA_PAN_ST_TBL bta_pan_st_tbl[] = {bta_pan_st_idle, bta_pan_st_open, 119 bta_pan_st_closing}; 120 121 /***************************************************************************** 122 * Global data 123 ****************************************************************************/ 124 125 /* PAN control block */ 126 tBTA_PAN_CB bta_pan_cb; 127 128 /******************************************************************************* 129 * 130 * Function bta_pan_scb_alloc 131 * 132 * Description Allocate a PAN server control block. 133 * 134 * 135 * Returns pointer to the scb, or NULL if none could be allocated. 136 * 137 ******************************************************************************/ 138 tBTA_PAN_SCB* bta_pan_scb_alloc(void) { 139 tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0]; 140 int i; 141 142 for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { 143 if (!p_scb->in_use) { 144 p_scb->in_use = true; 145 APPL_TRACE_DEBUG("bta_pan_scb_alloc %d", i); 146 break; 147 } 148 } 149 150 if (i == BTA_PAN_NUM_CONN) { 151 /* out of scbs */ 152 p_scb = NULL; 153 APPL_TRACE_WARNING("Out of scbs"); 154 } 155 return p_scb; 156 } 157 158 /******************************************************************************* 159 * 160 * Function bta_pan_sm_execute 161 * 162 * Description State machine event handling function for PAN 163 * 164 * 165 * Returns void 166 * 167 ******************************************************************************/ 168 static void bta_pan_sm_execute(tBTA_PAN_SCB* p_scb, uint16_t event, 169 tBTA_PAN_DATA* p_data) { 170 tBTA_PAN_ST_TBL state_table; 171 uint8_t action; 172 int i; 173 174 APPL_TRACE_EVENT("PAN scb=%d event=0x%x state=%d", bta_pan_scb_to_idx(p_scb), 175 event, p_scb->state); 176 177 /* look up the state table for the current state */ 178 state_table = bta_pan_st_tbl[p_scb->state]; 179 180 event &= 0x00FF; 181 182 /* set next state */ 183 p_scb->state = state_table[event][BTA_PAN_NEXT_STATE]; 184 185 /* execute action functions */ 186 for (i = 0; i < BTA_PAN_ACTIONS; i++) { 187 action = state_table[event][i]; 188 CHECK(action < BTA_PAN_MAX_ACTIONS); 189 if (action == BTA_PAN_IGNORE) continue; 190 (*bta_pan_action[action])(p_scb, p_data); 191 } 192 } 193 194 /******************************************************************************* 195 * 196 * Function bta_pan_api_enable 197 * 198 * Description Handle an API enable event. 199 * 200 * 201 * Returns void 202 * 203 ******************************************************************************/ 204 static void bta_pan_api_enable(tBTA_PAN_DATA* p_data) { 205 /* initialize control block */ 206 memset(&bta_pan_cb, 0, sizeof(bta_pan_cb)); 207 208 /* store callback function */ 209 bta_pan_cb.p_cback = p_data->api_enable.p_cback; 210 bta_pan_enable(p_data); 211 } 212 213 /******************************************************************************* 214 * 215 * Function bta_pan_api_disable 216 * 217 * Description Handle an API disable event. 218 * 219 * 220 * Returns void 221 * 222 ******************************************************************************/ 223 static void bta_pan_api_disable(UNUSED_ATTR tBTA_PAN_DATA* p_data) { 224 bta_pan_disable(); 225 } 226 227 /******************************************************************************* 228 * 229 * Function bta_pan_api_open 230 * 231 * Description Handle an API listen event. 232 * 233 * 234 * Returns void 235 * 236 ******************************************************************************/ 237 static void bta_pan_api_open(tBTA_PAN_DATA* p_data) { 238 tBTA_PAN_SCB* p_scb; 239 tBTA_PAN bta_pan; 240 241 /* allocate an scb */ 242 p_scb = bta_pan_scb_alloc(); 243 if (p_scb != NULL) { 244 bta_pan_open(p_scb, p_data); 245 } else { 246 bta_pan.open.bd_addr = p_data->api_open.bd_addr; 247 bta_pan.open.status = BTA_PAN_FAIL; 248 bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, &bta_pan); 249 } 250 } 251 /******************************************************************************* 252 * 253 * Function bta_pan_scb_dealloc 254 * 255 * Description Deallocate a link control block. 256 * 257 * 258 * Returns void 259 * 260 ******************************************************************************/ 261 void bta_pan_scb_dealloc(tBTA_PAN_SCB* p_scb) { 262 APPL_TRACE_DEBUG("bta_pan_scb_dealloc %d", bta_pan_scb_to_idx(p_scb)); 263 fixed_queue_free(p_scb->data_queue, NULL); 264 memset(p_scb, 0, sizeof(tBTA_PAN_SCB)); 265 } 266 267 /******************************************************************************* 268 * 269 * Function bta_pan_scb_to_idx 270 * 271 * Description Given a pointer to an scb, return its index. 272 * 273 * 274 * Returns Index of scb. 275 * 276 ******************************************************************************/ 277 uint8_t bta_pan_scb_to_idx(tBTA_PAN_SCB* p_scb) { 278 return ((uint8_t)(p_scb - bta_pan_cb.scb)) + 1; 279 } 280 281 /******************************************************************************* 282 * 283 * Function bta_pan_scb_by_handle 284 * 285 * Description Find scb associated with handle. 286 * 287 * 288 * Returns Pointer to scb or NULL if not found. 289 * 290 ******************************************************************************/ 291 tBTA_PAN_SCB* bta_pan_scb_by_handle(uint16_t handle) { 292 tBTA_PAN_SCB* p_scb = &bta_pan_cb.scb[0]; 293 uint8_t i; 294 295 for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) { 296 if (p_scb->handle == handle) { 297 return p_scb; 298 ; 299 } 300 } 301 302 APPL_TRACE_WARNING("No scb for handle %d", handle); 303 304 return NULL; 305 } 306 307 /******************************************************************************* 308 * 309 * Function bta_pan_hdl_event 310 * 311 * Description Data gateway main event handling function. 312 * 313 * 314 * Returns void 315 * 316 ******************************************************************************/ 317 bool bta_pan_hdl_event(BT_HDR* p_msg) { 318 tBTA_PAN_SCB* p_scb; 319 bool freebuf = true; 320 321 switch (p_msg->event) { 322 /* handle enable event */ 323 case BTA_PAN_API_ENABLE_EVT: 324 bta_pan_api_enable((tBTA_PAN_DATA*)p_msg); 325 break; 326 327 /* handle disable event */ 328 case BTA_PAN_API_DISABLE_EVT: 329 bta_pan_api_disable((tBTA_PAN_DATA*)p_msg); 330 break; 331 332 /* handle set role event */ 333 case BTA_PAN_API_SET_ROLE_EVT: 334 bta_pan_set_role((tBTA_PAN_DATA*)p_msg); 335 break; 336 337 /* handle open event */ 338 case BTA_PAN_API_OPEN_EVT: 339 bta_pan_api_open((tBTA_PAN_DATA*)p_msg); 340 break; 341 342 /* events that require buffer not be released */ 343 case BTA_PAN_CI_RX_WRITEBUF_EVT: 344 freebuf = false; 345 p_scb = bta_pan_scb_by_handle(p_msg->layer_specific); 346 if (p_scb != NULL) { 347 bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg); 348 } 349 break; 350 351 /* all other events */ 352 default: 353 p_scb = bta_pan_scb_by_handle(p_msg->layer_specific); 354 if (p_scb != NULL) { 355 bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA*)p_msg); 356 } 357 break; 358 } 359 return freebuf; 360 } 361 #endif /* BTA_PAN_INCLUDED */ 362