1 /****************************************************************************** 2 * 3 * Copyright (C) 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 defined(BTA_PAN_INCLUDED) && (BTA_PAN_INCLUDED == TRUE) 28 29 #include <string.h> 30 #include "bta_api.h" 31 #include "bta_sys.h" 32 #include "gki.h" 33 #include "pan_api.h" 34 #include "bta_pan_api.h" 35 #include "bta_pan_int.h" 36 #include "bd.h" 37 38 /***************************************************************************** 39 ** Constants and types 40 *****************************************************************************/ 41 42 43 44 /* state machine action enumeration list */ 45 enum 46 { 47 BTA_PAN_API_CLOSE, 48 BTA_PAN_TX_PATH, 49 BTA_PAN_RX_PATH, 50 BTA_PAN_TX_FLOW, 51 BTA_PAN_WRITE_BUF, 52 BTA_PAN_CONN_OPEN, 53 BTA_PAN_CONN_CLOSE, 54 BTA_PAN_FREE_BUF, 55 BTA_PAN_IGNORE 56 }; 57 58 59 60 /* type for action functions */ 61 typedef void (*tBTA_PAN_ACTION)(tBTA_PAN_SCB *p_scb, tBTA_PAN_DATA *p_data); 62 63 64 65 66 /* action function list */ 67 const tBTA_PAN_ACTION bta_pan_action[] = 68 { 69 bta_pan_api_close, 70 bta_pan_tx_path, 71 bta_pan_rx_path, 72 bta_pan_tx_flow, 73 bta_pan_write_buf, 74 bta_pan_conn_open, 75 bta_pan_conn_close, 76 bta_pan_free_buf, 77 78 }; 79 80 /* state table information */ 81 #define BTA_PAN_ACTIONS 1 /* number of actions */ 82 #define BTA_PAN_NEXT_STATE 1 /* position of next state */ 83 #define BTA_PAN_NUM_COLS 2 /* number of columns in state tables */ 84 85 86 /* state machine states */ 87 enum 88 { 89 BTA_PAN_IDLE_ST, 90 BTA_PAN_OPEN_ST, 91 BTA_PAN_CLOSING_ST 92 }; 93 94 95 /* state table for listen state */ 96 const UINT8 bta_pan_st_idle[][BTA_PAN_NUM_COLS] = 97 { 98 /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_IDLE_ST}, 99 /* CI_TX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 100 /* CI_RX_READY */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 101 /* CI_TX_FLOW */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 102 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 103 /* CI_RX_WRITEBUF */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 104 /* PAN_CONN_OPEN */ {BTA_PAN_CONN_OPEN, BTA_PAN_OPEN_ST}, 105 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_OPEN, BTA_PAN_IDLE_ST}, 106 /* FLOW_ENABLE */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST}, 107 /* BNEP_DATA */ {BTA_PAN_IGNORE, BTA_PAN_IDLE_ST} 108 109 }; 110 111 112 113 /* state table for open state */ 114 const UINT8 bta_pan_st_open[][BTA_PAN_NUM_COLS] = 115 { 116 /* API_CLOSE */ {BTA_PAN_API_CLOSE, BTA_PAN_OPEN_ST}, 117 /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST}, 118 /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, 119 /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_OPEN_ST}, 120 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, 121 /* CI_RX_WRITEBUF */ {BTA_PAN_WRITE_BUF, BTA_PAN_OPEN_ST}, 122 /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_OPEN_ST}, 123 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, 124 /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_OPEN_ST}, 125 /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_OPEN_ST} 126 }; 127 128 /* state table for closing state */ 129 const UINT8 bta_pan_st_closing[][BTA_PAN_NUM_COLS] = 130 { 131 /* API_CLOSE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 132 /* CI_TX_READY */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST}, 133 /* CI_RX_READY */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, 134 /* CI_TX_FLOW */ {BTA_PAN_TX_FLOW, BTA_PAN_CLOSING_ST}, 135 /* CI_RX_WRITE */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 136 /* CI_RX_WRITEBUF */ {BTA_PAN_FREE_BUF, BTA_PAN_CLOSING_ST}, 137 /* PAN_CONN_OPEN */ {BTA_PAN_IGNORE, BTA_PAN_CLOSING_ST}, 138 /* PAN_CONN_CLOSE */ {BTA_PAN_CONN_CLOSE, BTA_PAN_IDLE_ST}, 139 /* FLOW_ENABLE */ {BTA_PAN_RX_PATH, BTA_PAN_CLOSING_ST}, 140 /* BNEP_DATA */ {BTA_PAN_TX_PATH, BTA_PAN_CLOSING_ST} 141 }; 142 143 /* type for state table */ 144 typedef const UINT8 (*tBTA_PAN_ST_TBL)[BTA_PAN_NUM_COLS]; 145 146 /* state table */ 147 const tBTA_PAN_ST_TBL bta_pan_st_tbl[] = { 148 bta_pan_st_idle, 149 bta_pan_st_open, 150 bta_pan_st_closing 151 }; 152 153 /***************************************************************************** 154 ** Global data 155 *****************************************************************************/ 156 157 /* PAN control block */ 158 #if BTA_DYNAMIC_MEMORY == FALSE 159 tBTA_PAN_CB bta_pan_cb; 160 #endif 161 162 /******************************************************************************* 163 ** 164 ** Function bta_pan_scb_alloc 165 ** 166 ** Description Allocate a PAN server control block. 167 ** 168 ** 169 ** Returns pointer to the scb, or NULL if none could be allocated. 170 ** 171 *******************************************************************************/ 172 tBTA_PAN_SCB *bta_pan_scb_alloc(void) 173 { 174 tBTA_PAN_SCB *p_scb = &bta_pan_cb.scb[0]; 175 int i; 176 177 for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) 178 { 179 if (!p_scb->in_use) 180 { 181 p_scb->in_use = TRUE; 182 APPL_TRACE_DEBUG1("bta_pan_scb_alloc %d", i); 183 break; 184 } 185 } 186 187 if (i == BTA_PAN_NUM_CONN) 188 { 189 /* out of scbs */ 190 p_scb = NULL; 191 APPL_TRACE_WARNING0("Out of scbs"); 192 } 193 return p_scb; 194 } 195 196 /******************************************************************************* 197 ** 198 ** Function bta_pan_sm_execute 199 ** 200 ** Description State machine event handling function for PAN 201 ** 202 ** 203 ** Returns void 204 ** 205 *******************************************************************************/ 206 static void bta_pan_sm_execute(tBTA_PAN_SCB *p_scb, UINT16 event, tBTA_PAN_DATA *p_data) 207 { 208 tBTA_PAN_ST_TBL state_table; 209 UINT8 action; 210 int i; 211 212 APPL_TRACE_EVENT3("PAN scb=%d event=0x%x state=%d", bta_pan_scb_to_idx(p_scb), event, p_scb->state); 213 214 /* look up the state table for the current state */ 215 state_table = bta_pan_st_tbl[p_scb->state]; 216 217 event &= 0x00FF; 218 219 /* set next state */ 220 p_scb->state = state_table[event][BTA_PAN_NEXT_STATE]; 221 222 /* execute action functions */ 223 for (i = 0; i < BTA_PAN_ACTIONS; i++) 224 { 225 if ((action = state_table[event][i]) != BTA_PAN_IGNORE) 226 { 227 (*bta_pan_action[action])(p_scb, p_data); 228 } 229 else 230 { 231 break; 232 } 233 } 234 } 235 236 /******************************************************************************* 237 ** 238 ** Function bta_pan_api_enable 239 ** 240 ** Description Handle an API enable event. 241 ** 242 ** 243 ** Returns void 244 ** 245 *******************************************************************************/ 246 static void bta_pan_api_enable(tBTA_PAN_DATA *p_data) 247 { 248 /* initialize control block */ 249 memset(&bta_pan_cb, 0, sizeof(bta_pan_cb)); 250 251 /* store callback function */ 252 bta_pan_cb.p_cback = p_data->api_enable.p_cback; 253 bta_pan_enable(p_data); 254 } 255 256 /******************************************************************************* 257 ** 258 ** Function bta_pan_api_disable 259 ** 260 ** Description Handle an API disable event. 261 ** 262 ** 263 ** Returns void 264 ** 265 *******************************************************************************/ 266 static void bta_pan_api_disable(tBTA_PAN_DATA *p_data) 267 { 268 bta_pan_disable(); 269 } 270 271 272 /******************************************************************************* 273 ** 274 ** Function bta_pan_api_open 275 ** 276 ** Description Handle an API listen event. 277 ** 278 ** 279 ** Returns void 280 ** 281 *******************************************************************************/ 282 static void bta_pan_api_open(tBTA_PAN_DATA *p_data) 283 { 284 tBTA_PAN_SCB *p_scb; 285 tBTA_PAN_OPEN data; 286 287 /* allocate an scb */ 288 if ((p_scb = bta_pan_scb_alloc()) != NULL) 289 { 290 bta_pan_open(p_scb, p_data); 291 } 292 else 293 { 294 bdcpy(data.bd_addr, p_data->api_open.bd_addr); 295 data.status = BTA_PAN_FAIL; 296 bta_pan_cb.p_cback(BTA_PAN_OPEN_EVT, (tBTA_PAN *)&data); 297 298 } 299 } 300 /******************************************************************************* 301 ** 302 ** Function bta_pan_scb_dealloc 303 ** 304 ** Description Deallocate a link control block. 305 ** 306 ** 307 ** Returns void 308 ** 309 *******************************************************************************/ 310 void bta_pan_scb_dealloc(tBTA_PAN_SCB *p_scb) 311 { 312 APPL_TRACE_DEBUG1("bta_pan_scb_dealloc %d", bta_pan_scb_to_idx(p_scb)); 313 memset(p_scb, 0, sizeof(tBTA_PAN_SCB)); 314 } 315 316 /******************************************************************************* 317 ** 318 ** Function bta_pan_scb_to_idx 319 ** 320 ** Description Given a pointer to an scb, return its index. 321 ** 322 ** 323 ** Returns Index of scb. 324 ** 325 *******************************************************************************/ 326 UINT8 bta_pan_scb_to_idx(tBTA_PAN_SCB *p_scb) 327 { 328 329 return ((UINT8) (p_scb - bta_pan_cb.scb)) + 1; 330 } 331 332 333 334 /******************************************************************************* 335 ** 336 ** Function bta_pan_scb_by_handle 337 ** 338 ** Description Find scb associated with handle. 339 ** 340 ** 341 ** Returns Pointer to scb or NULL if not found. 342 ** 343 *******************************************************************************/ 344 tBTA_PAN_SCB *bta_pan_scb_by_handle(UINT16 handle) 345 { 346 tBTA_PAN_SCB *p_scb = &bta_pan_cb.scb[0]; 347 UINT8 i; 348 349 for (i = 0; i < BTA_PAN_NUM_CONN; i++, p_scb++) 350 { 351 if (p_scb->handle == handle) 352 { 353 return p_scb;; 354 } 355 } 356 357 358 APPL_TRACE_WARNING1("No scb for handle %d", handle); 359 360 return NULL; 361 } 362 363 /******************************************************************************* 364 ** 365 ** Function bta_pan_hdl_event 366 ** 367 ** Description Data gateway main event handling function. 368 ** 369 ** 370 ** Returns void 371 ** 372 *******************************************************************************/ 373 BOOLEAN bta_pan_hdl_event(BT_HDR *p_msg) 374 { 375 tBTA_PAN_SCB *p_scb; 376 BOOLEAN freebuf = TRUE; 377 378 switch (p_msg->event) 379 { 380 /* handle enable event */ 381 case BTA_PAN_API_ENABLE_EVT: 382 bta_pan_api_enable((tBTA_PAN_DATA *) p_msg); 383 break; 384 385 /* handle disable event */ 386 case BTA_PAN_API_DISABLE_EVT: 387 bta_pan_api_disable((tBTA_PAN_DATA *) p_msg); 388 break; 389 390 /* handle set role event */ 391 case BTA_PAN_API_SET_ROLE_EVT: 392 bta_pan_set_role((tBTA_PAN_DATA *) p_msg); 393 break; 394 395 /* handle open event */ 396 case BTA_PAN_API_OPEN_EVT: 397 bta_pan_api_open((tBTA_PAN_DATA *) p_msg); 398 break; 399 400 401 /* events that require buffer not be released */ 402 case BTA_PAN_CI_RX_WRITEBUF_EVT: 403 freebuf = FALSE; 404 if ((p_scb = bta_pan_scb_by_handle(p_msg->layer_specific)) != NULL) 405 { 406 bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA *) p_msg); 407 } 408 break; 409 410 /* all other events */ 411 default: 412 if ((p_scb = bta_pan_scb_by_handle(p_msg->layer_specific)) != NULL) 413 { 414 bta_pan_sm_execute(p_scb, p_msg->event, (tBTA_PAN_DATA *) p_msg); 415 } 416 break; 417 418 } 419 return freebuf; 420 } 421 #endif /* BTA_PAN_INCLUDED */ 422
