1 /****************************************************************************** 2 * 3 * Copyright (C) 2009-2012 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 is the implementation file for the MCAP Control channel state 22 * machine. 23 * 24 ******************************************************************************/ 25 #include <string.h> 26 27 #include "bt_target.h" 28 #include "mca_api.h" 29 #include "mca_defs.h" 30 #include "mca_int.h" 31 #include "btu.h" 32 33 /***************************************************************************** 34 ** data channel state machine constants and types 35 *****************************************************************************/ 36 enum 37 { 38 MCA_CCB_FREE_MSG, 39 MCA_CCB_SND_REQ, 40 MCA_CCB_SND_RSP, 41 MCA_CCB_DO_DISCONN, 42 MCA_CCB_CONG, 43 MCA_CCB_HDL_REQ, 44 MCA_CCB_HDL_RSP, 45 MCA_CCB_LL_OPEN, 46 MCA_CCB_DL_OPEN, 47 MCA_CCB_DEALLOC, 48 MCA_CCB_RSP_TOUT, 49 MCA_CCB_NUM_ACTIONS 50 }; 51 #define MCA_CCB_IGNORE MCA_CCB_NUM_ACTIONS 52 53 /* action function list */ 54 const tMCA_CCB_ACTION mca_ccb_action[] = { 55 mca_ccb_free_msg, 56 mca_ccb_snd_req, 57 mca_ccb_snd_rsp, 58 mca_ccb_do_disconn, 59 mca_ccb_cong, 60 mca_ccb_hdl_req, 61 mca_ccb_hdl_rsp, 62 mca_ccb_ll_open, 63 mca_ccb_dl_open, 64 mca_ccb_dealloc, 65 mca_ccb_rsp_tout, 66 }; 67 68 /* state table information */ 69 #define MCA_CCB_ACTIONS 1 /* number of actions */ 70 #define MCA_CCB_ACT_COL 0 /* position of action function */ 71 #define MCA_CCB_NEXT_STATE 1 /* position of next state */ 72 #define MCA_CCB_NUM_COLS 2 /* number of columns in state tables */ 73 74 /* state table for opening state */ 75 const UINT8 mca_ccb_st_opening[][MCA_CCB_NUM_COLS] = { 76 /* Event Action Next State */ 77 /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, 78 /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_DO_DISCONN, MCA_CCB_CLOSING_ST}, 79 /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, 80 /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, 81 /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, 82 /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_OPENING_ST}, 83 /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST}, 84 /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_LL_OPEN, MCA_CCB_OPEN_ST}, 85 /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, 86 /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_CONG, MCA_CCB_OPENING_ST}, 87 /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPENING_ST} 88 }; 89 90 /* state table for open state */ 91 const UINT8 mca_ccb_st_open[][MCA_CCB_NUM_COLS] = { 92 /* Event Action Next State */ 93 /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPEN_ST}, 94 /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_DO_DISCONN, MCA_CCB_CLOSING_ST}, 95 /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_SND_REQ, MCA_CCB_OPEN_ST}, 96 /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_SND_RSP, MCA_CCB_OPEN_ST}, 97 /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_HDL_REQ, MCA_CCB_OPEN_ST}, 98 /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_HDL_RSP, MCA_CCB_OPEN_ST}, 99 /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_DL_OPEN, MCA_CCB_OPEN_ST}, 100 /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_OPEN_ST}, 101 /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, 102 /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_CONG, MCA_CCB_OPEN_ST}, 103 /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_RSP_TOUT, MCA_CCB_OPEN_ST} 104 }; 105 106 /* state table for closing state */ 107 const UINT8 mca_ccb_st_closing[][MCA_CCB_NUM_COLS] = { 108 /* Event Action Next State */ 109 /* MCA_CCB_API_CONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 110 /* MCA_CCB_API_DISCONNECT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 111 /* MCA_CCB_API_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, 112 /* MCA_CCB_API_RSP_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 113 /* MCA_CCB_MSG_REQ_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, 114 /* MCA_CCB_MSG_RSP_EVT */ {MCA_CCB_FREE_MSG, MCA_CCB_CLOSING_ST}, 115 /* MCA_CCB_DL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 116 /* MCA_CCB_LL_OPEN_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 117 /* MCA_CCB_LL_CLOSE_EVT */ {MCA_CCB_DEALLOC, MCA_CCB_NULL_ST}, 118 /* MCA_CCB_LL_CONG_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST}, 119 /* MCA_CCB_RSP_TOUT_EVT */ {MCA_CCB_IGNORE, MCA_CCB_CLOSING_ST} 120 }; 121 122 /* type for state table */ 123 typedef const UINT8 (*tMCA_CCB_ST_TBL)[MCA_CCB_NUM_COLS]; 124 125 /* state table */ 126 const tMCA_CCB_ST_TBL mca_ccb_st_tbl[] = { 127 mca_ccb_st_opening, 128 mca_ccb_st_open, 129 mca_ccb_st_closing 130 }; 131 132 #if (BT_TRACE_VERBOSE == TRUE) 133 /* verbose event strings for trace */ 134 static const char * const mca_ccb_evt_str[] = { 135 "API_CONNECT_EVT", 136 "API_DISCONNECT_EVT", 137 "API_REQ_EVT", 138 "API_RSP_EVT", 139 "MSG_REQ_EVT", 140 "MSG_RSP_EVT", 141 "DL_OPEN_EVT", 142 "LL_OPEN_EVT", 143 "LL_CLOSE_EVT", 144 "LL_CONG_EVT", 145 "RSP_TOUT_EVT" 146 }; 147 /* verbose state strings for trace */ 148 static const char * const mca_ccb_st_str[] = { 149 "NULL_ST", 150 "OPENING_ST", 151 "OPEN_ST", 152 "CLOSING_ST" 153 }; 154 #endif 155 156 /******************************************************************************* 157 ** 158 ** Function mca_stop_timer 159 ** 160 ** Description This function is stop a MCAP timer 161 ** 162 ** This function is for use internal to MCAP only. 163 ** 164 ** Returns void 165 ** 166 *******************************************************************************/ 167 void mca_stop_timer(tMCA_CCB *p_ccb) 168 { 169 alarm_cancel(p_ccb->mca_ccb_timer); 170 } 171 172 /******************************************************************************* 173 ** 174 ** Function mca_ccb_event 175 ** 176 ** Description This function is the CCB state machine main function. 177 ** It uses the state and action function tables to execute 178 ** action functions. 179 ** 180 ** Returns void. 181 ** 182 *******************************************************************************/ 183 void mca_ccb_event(tMCA_CCB *p_ccb, UINT8 event, tMCA_CCB_EVT *p_data) 184 { 185 tMCA_CCB_ST_TBL state_table; 186 UINT8 action; 187 188 #if (BT_TRACE_VERBOSE == TRUE) 189 MCA_TRACE_EVENT("CCB ccb=%d event=%s state=%s", mca_ccb_to_hdl(p_ccb), mca_ccb_evt_str[event], mca_ccb_st_str[p_ccb->state]); 190 #else 191 MCA_TRACE_EVENT("CCB ccb=%d event=%d state=%d", mca_ccb_to_hdl(p_ccb), event, p_ccb->state); 192 #endif 193 194 /* look up the state table for the current state */ 195 state_table = mca_ccb_st_tbl[p_ccb->state - 1]; 196 197 /* set next state */ 198 p_ccb->state = state_table[event][MCA_CCB_NEXT_STATE]; 199 200 /* execute action functions */ 201 if ((action = state_table[event][MCA_CCB_ACT_COL]) != MCA_CCB_IGNORE) 202 { 203 (*mca_ccb_action[action])(p_ccb, p_data); 204 } 205 } 206 207 /******************************************************************************* 208 ** 209 ** Function mca_ccb_by_bd 210 ** 211 ** Description This function looks up the CCB based on the BD address. 212 ** It returns a pointer to the CCB. 213 ** If no CCB is found it returns NULL. 214 ** 215 ** Returns void. 216 ** 217 *******************************************************************************/ 218 tMCA_CCB *mca_ccb_by_bd(tMCA_HANDLE handle, BD_ADDR bd_addr) 219 { 220 tMCA_CCB *p_ccb = NULL; 221 tMCA_RCB *p_rcb = mca_rcb_by_handle(handle); 222 tMCA_CCB *p_ccb_tmp; 223 int i; 224 225 if (p_rcb) 226 { 227 i = handle-1; 228 p_ccb_tmp = &mca_cb.ccb[i*MCA_NUM_LINKS]; 229 for (i=0; i<MCA_NUM_LINKS; i++, p_ccb_tmp++) 230 { 231 if (p_ccb_tmp->state != MCA_CCB_NULL_ST && memcmp(p_ccb_tmp->peer_addr, bd_addr, BD_ADDR_LEN) == 0) 232 { 233 p_ccb = p_ccb_tmp; 234 break; 235 } 236 } 237 } 238 return p_ccb; 239 } 240 241 /******************************************************************************* 242 ** 243 ** Function mca_ccb_alloc 244 ** 245 ** Description This function allocates a CCB and copies the BD address to 246 ** the CCB. It returns a pointer to the CCB. If no CCB can 247 ** be allocated it returns NULL. 248 ** 249 ** Returns void. 250 ** 251 *******************************************************************************/ 252 tMCA_CCB *mca_ccb_alloc(tMCA_HANDLE handle, BD_ADDR bd_addr) 253 { 254 tMCA_CCB *p_ccb = NULL; 255 tMCA_RCB *p_rcb = mca_rcb_by_handle(handle); 256 tMCA_CCB *p_ccb_tmp; 257 int i; 258 259 MCA_TRACE_DEBUG("mca_ccb_alloc handle:0x%x", handle); 260 if (p_rcb) 261 { 262 i = handle-1; 263 p_ccb_tmp = &mca_cb.ccb[i*MCA_NUM_LINKS]; 264 for (i=0; i<MCA_NUM_LINKS; i++, p_ccb_tmp++) 265 { 266 if (p_ccb_tmp->state == MCA_CCB_NULL_ST) 267 { 268 p_ccb_tmp->p_rcb = p_rcb; 269 p_ccb_tmp->mca_ccb_timer = alarm_new("mca.mca_ccb_timer"); 270 p_ccb_tmp->state = MCA_CCB_OPENING_ST; 271 p_ccb_tmp->cong = TRUE; 272 memcpy(p_ccb_tmp->peer_addr, bd_addr, BD_ADDR_LEN); 273 p_ccb = p_ccb_tmp; 274 break; 275 } 276 } 277 } 278 return p_ccb; 279 } 280 281 282 /******************************************************************************* 283 ** 284 ** Function mca_ccb_dealloc 285 ** 286 ** Description This function deallocates a CCB. 287 ** 288 ** Returns void. 289 ** 290 *******************************************************************************/ 291 void mca_ccb_dealloc(tMCA_CCB *p_ccb, tMCA_CCB_EVT *p_data) 292 { 293 tMCA_CTRL evt_data; 294 295 MCA_TRACE_DEBUG("mca_ccb_dealloc ctrl_vpsm:0x%x", p_ccb->ctrl_vpsm); 296 mca_dcb_close_by_mdl_id (p_ccb, MCA_ALL_MDL_ID); 297 if (p_ccb->ctrl_vpsm) 298 { 299 L2CA_Deregister (p_ccb->ctrl_vpsm); 300 } 301 if (p_ccb->data_vpsm) 302 { 303 L2CA_Deregister (p_ccb->data_vpsm); 304 } 305 osi_free_and_reset((void **)&p_ccb->p_rx_msg); 306 osi_free_and_reset((void **)&p_ccb->p_tx_req); 307 mca_stop_timer(p_ccb); 308 309 if (p_data) 310 { 311 /* non-NULL -> an action function -> report disconnect event */ 312 memcpy (evt_data.disconnect_ind.bd_addr, p_ccb->peer_addr, BD_ADDR_LEN); 313 evt_data.disconnect_ind.reason = p_data->close.reason; 314 mca_ccb_report_event(p_ccb, MCA_DISCONNECT_IND_EVT, &evt_data); 315 } 316 mca_free_tc_tbl_by_lcid (p_ccb->lcid); 317 alarm_free(p_ccb->mca_ccb_timer); 318 memset(p_ccb, 0, sizeof(tMCA_CCB)); 319 } 320 321 /******************************************************************************* 322 ** 323 ** Function mca_ccb_to_hdl 324 ** 325 ** Description This function converts a pointer to a CCB to a tMCA_CL 326 ** and returns the value. 327 ** 328 ** Returns void. 329 ** 330 *******************************************************************************/ 331 tMCA_CL mca_ccb_to_hdl(tMCA_CCB *p_ccb) 332 { 333 return (UINT8) (p_ccb - mca_cb.ccb + 1); 334 } 335 336 /******************************************************************************* 337 ** 338 ** Function mca_ccb_by_hdl 339 ** 340 ** Description This function converts an index value to a CCB. It returns 341 ** a pointer to the CCB. If no valid CCB matches the index it 342 ** returns NULL. 343 ** 344 ** Returns void. 345 ** 346 *******************************************************************************/ 347 tMCA_CCB *mca_ccb_by_hdl(tMCA_CL mcl) 348 { 349 tMCA_CCB * p_ccb = NULL; 350 if (mcl && mcl <= MCA_NUM_CCBS && mca_cb.ccb[mcl-1].state) 351 p_ccb = &mca_cb.ccb[mcl-1]; 352 return p_ccb; 353 } 354 355 356 /******************************************************************************* 357 ** 358 ** Function mca_ccb_uses_mdl_id 359 ** 360 ** Description This function checkes if a given mdl_id is in use. 361 ** 362 ** Returns TRUE, if the given mdl_id is currently used in the MCL. 363 ** 364 *******************************************************************************/ 365 BOOLEAN mca_ccb_uses_mdl_id(tMCA_CCB *p_ccb, UINT16 mdl_id) 366 { 367 BOOLEAN uses = FALSE; 368 tMCA_DCB *p_dcb; 369 int i; 370 371 i = mca_ccb_to_hdl(p_ccb)-1; 372 p_dcb = &mca_cb.dcb[i*MCA_NUM_MDLS]; 373 for (i=0; i<MCA_NUM_MDLS; i++, p_dcb++) 374 { 375 if (p_dcb->state != MCA_DCB_NULL_ST && p_dcb->mdl_id == mdl_id) 376 { 377 uses = TRUE; 378 break; 379 } 380 } 381 382 return uses; 383 } 384
