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 * Filename: hci_h4.c 22 * 23 * Description: Contains HCI transport send/receive functions 24 * 25 ******************************************************************************/ 26 27 #define LOG_TAG "bt_h4" 28 29 #include <utils/Log.h> 30 #include <stdlib.h> 31 #include <fcntl.h> 32 #include "bt_hci_bdroid.h" 33 #include "hci.h" 34 #include "userial.h" 35 #include "utils.h" 36 37 /****************************************************************************** 38 ** Constants & Macros 39 ******************************************************************************/ 40 41 #ifndef HCI_DBG 42 #define HCI_DBG FALSE 43 #endif 44 45 #if (HCI_DBG == TRUE) 46 #define HCIDBG(param, ...) {LOGD(param, ## __VA_ARGS__);} 47 #else 48 #define HCIDBG(param, ...) {} 49 #endif 50 51 /* Preamble length for HCI Commands: 52 ** 2-bytes for opcode and 1 byte for length 53 */ 54 #define HCI_CMD_PREAMBLE_SIZE 3 55 56 /* Preamble length for HCI Events: 57 ** 1-byte for opcode and 1 byte for length 58 */ 59 #define HCI_EVT_PREAMBLE_SIZE 2 60 61 /* Preamble length for SCO Data: 62 ** 2-byte for Handle and 1 byte for length 63 */ 64 #define HCI_SCO_PREAMBLE_SIZE 3 65 66 /* Preamble length for ACL Data: 67 ** 2-byte for Handle and 2 byte for length 68 */ 69 #define HCI_ACL_PREAMBLE_SIZE 4 70 71 /* Table of HCI preamble sizes for the different HCI message types */ 72 static const uint8_t hci_preamble_table[] = 73 { 74 HCI_CMD_PREAMBLE_SIZE, 75 HCI_ACL_PREAMBLE_SIZE, 76 HCI_SCO_PREAMBLE_SIZE, 77 HCI_EVT_PREAMBLE_SIZE 78 }; 79 80 /* HCI H4 message type definitions */ 81 #define H4_TYPE_COMMAND 1 82 #define H4_TYPE_ACL_DATA 2 83 #define H4_TYPE_SCO_DATA 3 84 #define H4_TYPE_EVENT 4 85 86 static const uint16_t msg_evt_table[] = 87 { 88 MSG_HC_TO_STACK_HCI_ERR, /* H4_TYPE_COMMAND */ 89 MSG_HC_TO_STACK_HCI_ACL, /* H4_TYPE_ACL_DATA */ 90 MSG_HC_TO_STACK_HCI_SCO, /* H4_TYPE_SCO_DATA */ 91 MSG_HC_TO_STACK_HCI_EVT /* H4_TYPE_EVENT */ 92 }; 93 94 #define ACL_RX_PKT_START 2 95 #define ACL_RX_PKT_CONTINUE 1 96 #define L2CAP_HEADER_SIZE 4 97 98 /* Maximum numbers of allowed internal 99 ** outstanding command packets at any time 100 */ 101 #define INT_CMD_PKT_MAX_COUNT 8 102 #define INT_CMD_PKT_IDX_MASK 0x07 103 104 #define HCI_COMMAND_COMPLETE_EVT 0x0E 105 #define HCI_COMMAND_STATUS_EVT 0x0F 106 #define HCI_READ_BUFFER_SIZE 0x1005 107 #define HCI_LE_READ_BUFFER_SIZE 0x2002 108 109 /****************************************************************************** 110 ** Local type definitions 111 ******************************************************************************/ 112 113 /* H4 Rx States */ 114 typedef enum { 115 H4_RX_MSGTYPE_ST, 116 H4_RX_LEN_ST, 117 H4_RX_DATA_ST, 118 H4_RX_IGNORE_ST 119 } tHCI_H4_RCV_STATE; 120 121 /* Callback function for the returned event of internal issued command */ 122 typedef void (*tINT_CMD_CBACK)(void *p_mem); 123 124 typedef struct 125 { 126 uint16_t opcode; /* OPCODE of outstanding internal commands */ 127 tINT_CMD_CBACK cback; /* Callback function when return of internal 128 * command is received */ 129 } tINT_CMD_Q; 130 131 /* Control block for HCISU_H4 */ 132 typedef struct 133 { 134 HC_BT_HDR *p_rcv_msg; /* Buffer to hold current rx HCI message */ 135 uint16_t rcv_len; /* Size of current incoming message */ 136 uint8_t rcv_msg_type; /* Current incoming message type */ 137 tHCI_H4_RCV_STATE rcv_state; /* Receive state of current rx message */ 138 uint16_t hc_acl_data_size; /* Controller's max ACL data length */ 139 uint16_t hc_ble_acl_data_size; /* Controller's max BLE ACL data length */ 140 BUFFER_Q acl_rx_q; /* Queue of base buffers for fragmented ACL pkts */ 141 uint8_t preload_count; /* Count numbers of preload bytes */ 142 uint8_t preload_buffer[6]; /* HCI_ACL_PREAMBLE_SIZE + 2 */ 143 int int_cmd_rsp_pending; /* Num of internal cmds pending for ack */ 144 uint8_t int_cmd_rd_idx; /* Read index of int_cmd_opcode queue */ 145 uint8_t int_cmd_wrt_idx; /* Write index of int_cmd_opcode queue */ 146 tINT_CMD_Q int_cmd[INT_CMD_PKT_MAX_COUNT]; /* FIFO queue */ 147 } tHCI_H4_CB; 148 149 /****************************************************************************** 150 ** Externs 151 ******************************************************************************/ 152 153 extern BUFFER_Q tx_q; 154 155 void btsnoop_init(void); 156 void btsnoop_close(void); 157 void btsnoop_cleanup (void); 158 void btsnoop_capture(HC_BT_HDR *p_buf, uint8_t is_rcvd); 159 uint8_t hci_h4_send_int_cmd(uint16_t opcode, HC_BT_HDR *p_buf, \ 160 tINT_CMD_CBACK p_cback); 161 void lpm_wake_assert(void); 162 void lpm_tx_done(uint8_t is_tx_done); 163 164 /****************************************************************************** 165 ** Variables 166 ******************************************************************************/ 167 168 /* Num of allowed outstanding HCI CMD packets */ 169 volatile int num_hci_cmd_pkts = 1; 170 171 /****************************************************************************** 172 ** Static variables 173 ******************************************************************************/ 174 175 static tHCI_H4_CB h4_cb; 176 177 /****************************************************************************** 178 ** Static functions 179 ******************************************************************************/ 180 181 /******************************************************************************* 182 ** 183 ** Function get_acl_data_length_cback 184 ** 185 ** Description Callback function for HCI_READ_BUFFER_SIZE and 186 ** HCI_LE_READ_BUFFER_SIZE commands if they were sent because 187 ** of internal request. 188 ** 189 ** Returns None 190 ** 191 *******************************************************************************/ 192 void get_acl_data_length_cback(void *p_mem) 193 { 194 uint8_t *p, status; 195 uint16_t opcode, len=0; 196 HC_BT_HDR *p_buf = (HC_BT_HDR *) p_mem; 197 198 p = (uint8_t *)(p_buf + 1) + 3; 199 STREAM_TO_UINT16(opcode, p) 200 status = *p++; 201 if (status == 0) /* Success */ 202 STREAM_TO_UINT16(len, p) 203 204 if (opcode == HCI_READ_BUFFER_SIZE) 205 { 206 if (status == 0) 207 h4_cb.hc_acl_data_size = len; 208 209 /* reuse the rx buffer for sending HCI_LE_READ_BUFFER_SIZE command */ 210 p_buf->event = MSG_STACK_TO_HC_HCI_CMD; 211 p_buf->offset = 0; 212 p_buf->layer_specific = 0; 213 p_buf->len = 3; 214 215 p = (uint8_t *) (p_buf + 1); 216 UINT16_TO_STREAM(p, HCI_LE_READ_BUFFER_SIZE); 217 *p = 0; 218 219 if ((status = hci_h4_send_int_cmd(HCI_LE_READ_BUFFER_SIZE, p_buf, \ 220 get_acl_data_length_cback)) == FALSE) 221 { 222 bt_hc_cbacks->dealloc((TRANSAC) p_buf, (char *) (p_buf + 1)); 223 bt_hc_cbacks->postload_cb(NULL, BT_HC_POSTLOAD_SUCCESS); 224 } 225 } 226 else if (opcode == HCI_LE_READ_BUFFER_SIZE) 227 { 228 if (status == 0) 229 h4_cb.hc_ble_acl_data_size = (len) ? len : h4_cb.hc_acl_data_size; 230 231 if (bt_hc_cbacks) 232 { 233 bt_hc_cbacks->dealloc((TRANSAC) p_buf, (char *) (p_buf + 1)); 234 ALOGE("vendor lib postload completed"); 235 bt_hc_cbacks->postload_cb(NULL, BT_HC_POSTLOAD_SUCCESS); 236 } 237 } 238 } 239 240 241 /******************************************************************************* 242 ** 243 ** Function internal_event_intercept 244 ** 245 ** Description This function is called to parse received HCI event and 246 ** - update the Num_HCI_Command_Packets 247 ** - intercept the event if it is the result of an early 248 ** issued internal command. 249 ** 250 ** Returns TRUE : if the event had been intercepted for internal process 251 ** FALSE : send this event to core stack 252 ** 253 *******************************************************************************/ 254 uint8_t internal_event_intercept(void) 255 { 256 uint8_t *p; 257 uint8_t event_code; 258 uint16_t opcode, len; 259 tHCI_H4_CB *p_cb = &h4_cb; 260 261 p = (uint8_t *)(p_cb->p_rcv_msg + 1); 262 263 event_code = *p++; 264 len = *p++; 265 266 if (event_code == HCI_COMMAND_COMPLETE_EVT) 267 { 268 num_hci_cmd_pkts = *p++; 269 270 if (p_cb->int_cmd_rsp_pending > 0) 271 { 272 STREAM_TO_UINT16(opcode, p) 273 274 if (opcode == p_cb->int_cmd[p_cb->int_cmd_rd_idx].opcode) 275 { 276 HCIDBG( \ 277 "Intercept CommandCompleteEvent for internal command (0x%04X)",\ 278 opcode); 279 if (p_cb->int_cmd[p_cb->int_cmd_rd_idx].cback != NULL) 280 { 281 p_cb->int_cmd[p_cb->int_cmd_rd_idx].cback(p_cb->p_rcv_msg); 282 } 283 else 284 { 285 // Missing cback function! 286 // Release the p_rcv_msg buffer. 287 if (bt_hc_cbacks) 288 { 289 bt_hc_cbacks->dealloc((TRANSAC) p_cb->p_rcv_msg, \ 290 (char *) (p_cb->p_rcv_msg + 1)); 291 } 292 } 293 p_cb->int_cmd_rd_idx = ((p_cb->int_cmd_rd_idx+1) & \ 294 INT_CMD_PKT_IDX_MASK); 295 p_cb->int_cmd_rsp_pending--; 296 return TRUE; 297 } 298 } 299 } 300 else if (event_code == HCI_COMMAND_STATUS_EVT) 301 { 302 num_hci_cmd_pkts = *(++p); 303 } 304 305 return FALSE; 306 } 307 308 /******************************************************************************* 309 ** 310 ** Function acl_rx_frame_buffer_alloc 311 ** 312 ** Description This function is called from the HCI transport when the 313 ** first 4 or 6 bytes of an HCI ACL packet have been received: 314 ** - Allocate a new buffer if it is a start pakcet of L2CAP 315 ** message. 316 ** - Return the buffer address of the starting L2CAP message 317 ** frame if the packet is the next segment of a fragmented 318 ** L2CAP message. 319 ** 320 ** Returns the address of the receive buffer H4 RX should use 321 ** (CR419: Modified to return NULL in case of error.) 322 ** 323 ** NOTE This assumes that the L2CAP MTU size is less than the size 324 ** of an HCI ACL buffer, so the maximum L2CAP message will fit 325 ** into one buffer. 326 ** 327 *******************************************************************************/ 328 static HC_BT_HDR *acl_rx_frame_buffer_alloc (void) 329 { 330 uint8_t *p; 331 uint16_t handle; 332 uint16_t hci_len; 333 uint16_t total_len; 334 uint8_t pkt_type; 335 HC_BT_HDR *p_return_buf = NULL; 336 tHCI_H4_CB *p_cb = &h4_cb; 337 338 339 p = p_cb->preload_buffer; 340 341 STREAM_TO_UINT16 (handle, p); 342 STREAM_TO_UINT16 (hci_len, p); 343 STREAM_TO_UINT16 (total_len, p); 344 345 pkt_type = (uint8_t)(((handle) >> 12) & 0x0003); 346 handle = (uint16_t)((handle) & 0x0FFF); 347 348 if (p_cb->acl_rx_q.count) 349 { 350 uint16_t save_handle; 351 HC_BT_HDR *p_hdr = p_cb->acl_rx_q.p_first; 352 353 while (p_hdr != NULL) 354 { 355 p = (uint8_t *)(p_hdr + 1); 356 STREAM_TO_UINT16 (save_handle, p); 357 save_handle = (uint16_t)((save_handle) & 0x0FFF); 358 if (save_handle == handle) 359 { 360 p_return_buf = p_hdr; 361 break; 362 } 363 p_hdr = utils_getnext(p_hdr); 364 } 365 } 366 367 if (pkt_type == ACL_RX_PKT_START) /*** START PACKET ***/ 368 { 369 /* Might have read 2 bytes for the L2CAP payload length */ 370 p_cb->rcv_len = (hci_len) ? (hci_len - 2) : 0; 371 372 /* Start of packet. If we were in the middle of receiving */ 373 /* a packet on the same ACL handle, the original packet is incomplete. 374 * Drop it. */ 375 if (p_return_buf) 376 { 377 ALOGW("H4 - dropping incomplete ACL frame"); 378 379 utils_remove_from_queue(&(p_cb->acl_rx_q), p_return_buf); 380 381 if (bt_hc_cbacks) 382 { 383 bt_hc_cbacks->dealloc((TRANSAC) p_return_buf, \ 384 (char *) (p_return_buf + 1)); 385 } 386 p_return_buf = NULL; 387 } 388 389 /* Allocate a buffer for message */ 390 if (bt_hc_cbacks) 391 { 392 int len = total_len + HCI_ACL_PREAMBLE_SIZE + L2CAP_HEADER_SIZE + \ 393 BT_HC_HDR_SIZE; 394 p_return_buf = (HC_BT_HDR *) bt_hc_cbacks->alloc(len); 395 } 396 397 if (p_return_buf) 398 { 399 /* Initialize buffer with preloaded data */ 400 p_return_buf->offset = 0; 401 p_return_buf->layer_specific = 0; 402 p_return_buf->event = MSG_HC_TO_STACK_HCI_ACL; 403 p_return_buf->len = p_cb->preload_count; 404 memcpy((uint8_t *)(p_return_buf + 1), p_cb->preload_buffer, \ 405 p_cb->preload_count); 406 407 if (hci_len && ((total_len + L2CAP_HEADER_SIZE) > hci_len)) 408 { 409 /* Will expect to see fragmented ACL packets */ 410 /* Keep the base buffer address in the watching queue */ 411 utils_enqueue(&(p_cb->acl_rx_q), p_return_buf); 412 } 413 } 414 } 415 else /*** CONTINUATION PACKET ***/ 416 { 417 p_cb->rcv_len = hci_len; 418 419 if (p_return_buf) 420 { 421 /* Packet continuation and found the original rx buffer */ 422 uint8_t *p_f = p = (uint8_t *)(p_return_buf + 1) + 2; 423 424 STREAM_TO_UINT16 (total_len, p); 425 426 /* Update HCI header of first segment (base buffer) with new len */ 427 total_len += hci_len; 428 UINT16_TO_STREAM (p_f, total_len); 429 } 430 } 431 432 return (p_return_buf); 433 } 434 435 /******************************************************************************* 436 ** 437 ** Function acl_rx_frame_end_chk 438 ** 439 ** Description This function is called from the HCI transport when the last 440 ** byte of an HCI ACL packet has been received. It checks if 441 ** the L2CAP message is complete, i.e. no more continuation 442 ** packets are expected. 443 ** 444 ** Returns TRUE if message complete, FALSE if continuation expected 445 ** 446 *******************************************************************************/ 447 static uint8_t acl_rx_frame_end_chk (void) 448 { 449 uint8_t *p; 450 uint16_t handle, hci_len, l2cap_len; 451 HC_BT_HDR *p_buf; 452 tHCI_H4_CB *p_cb = &h4_cb; 453 uint8_t frame_end=TRUE; 454 455 p_buf = p_cb->p_rcv_msg; 456 p = (uint8_t *)(p_buf + 1); 457 458 STREAM_TO_UINT16 (handle, p); 459 STREAM_TO_UINT16 (hci_len, p); 460 STREAM_TO_UINT16 (l2cap_len, p); 461 462 if (hci_len > 0) 463 { 464 if (l2cap_len > (p_buf->len-(HCI_ACL_PREAMBLE_SIZE+L2CAP_HEADER_SIZE)) ) 465 { 466 /* If the L2CAP length has not been reached, tell H4 not to send 467 * this buffer to stack */ 468 frame_end = FALSE; 469 } 470 else 471 { 472 /* 473 * The current buffer coulb be in the watching list. 474 * Remove it from the list if it is in. 475 */ 476 if (p_cb->acl_rx_q.count) 477 utils_remove_from_queue(&(p_cb->acl_rx_q), p_buf); 478 } 479 } 480 481 /**** 482 ** Print snoop trace 483 ****/ 484 if (p_buf->offset) 485 { 486 /* CONTINUATION PACKET */ 487 488 /* save original p_buf->len content */ 489 uint16_t tmp_u16 = p_buf->len; 490 491 /* borrow HCI_ACL_PREAMBLE_SIZE bytes from the payload section */ 492 p = (uint8_t *)(p_buf + 1) + p_buf->offset - HCI_ACL_PREAMBLE_SIZE; 493 494 /* save contents */ 495 memcpy(p_cb->preload_buffer, p, HCI_ACL_PREAMBLE_SIZE); 496 497 /* Set packet boundary flags to "continuation packet" */ 498 handle = (handle & 0xCFFF) | 0x1000; 499 500 /* write handl & length info */ 501 UINT16_TO_STREAM (p, handle); 502 UINT16_TO_STREAM (p, (p_buf->len - p_buf->offset)); 503 504 /* roll pointer back */ 505 p = p - HCI_ACL_PREAMBLE_SIZE; 506 507 /* adjust `p_buf->offset` & `p_buf->len` 508 * before calling btsnoop_capture() */ 509 p_buf->offset = p_buf->offset - HCI_ACL_PREAMBLE_SIZE; 510 p_buf->len = p_buf->len - p_buf->offset; 511 512 btsnoop_capture(p_buf, TRUE); 513 514 /* restore contents */ 515 memcpy(p, p_cb->preload_buffer, HCI_ACL_PREAMBLE_SIZE); 516 517 /* restore p_buf->len */ 518 p_buf->len = tmp_u16; 519 } 520 else 521 { 522 /* START PACKET */ 523 btsnoop_capture(p_buf, TRUE); 524 } 525 526 if (frame_end == TRUE) 527 p_buf->offset = 0; 528 else 529 p_buf->offset = p_buf->len; /* save current buffer-end position */ 530 531 return frame_end; 532 } 533 534 /***************************************************************************** 535 ** HCI H4 INTERFACE FUNCTIONS 536 *****************************************************************************/ 537 538 /******************************************************************************* 539 ** 540 ** Function hci_h4_init 541 ** 542 ** Description Initialize H4 module 543 ** 544 ** Returns None 545 ** 546 *******************************************************************************/ 547 void hci_h4_init(void) 548 { 549 HCIDBG("hci_h4_init"); 550 551 memset(&h4_cb, 0, sizeof(tHCI_H4_CB)); 552 utils_queue_init(&(h4_cb.acl_rx_q)); 553 554 /* Per HCI spec., always starts with 1 */ 555 num_hci_cmd_pkts = 1; 556 557 /* Give an initial values of Host Controller's ACL data packet length 558 * Will update with an internal HCI(_LE)_Read_Buffer_Size request 559 */ 560 h4_cb.hc_acl_data_size = 1021; 561 h4_cb.hc_ble_acl_data_size = 27; 562 563 btsnoop_init(); 564 } 565 566 /******************************************************************************* 567 ** 568 ** Function hci_h4_cleanup 569 ** 570 ** Description Clean H4 module 571 ** 572 ** Returns None 573 ** 574 *******************************************************************************/ 575 void hci_h4_cleanup(void) 576 { 577 HCIDBG("hci_h4_cleanup"); 578 579 btsnoop_close(); 580 btsnoop_cleanup(); 581 } 582 583 /******************************************************************************* 584 ** 585 ** Function hci_h4_send_msg 586 ** 587 ** Description Determine message type, set HCI H4 packet indicator, and 588 ** send message through USERIAL driver 589 ** 590 ** Returns None 591 ** 592 *******************************************************************************/ 593 void hci_h4_send_msg(HC_BT_HDR *p_msg) 594 { 595 uint8_t type = 0; 596 uint16_t handle; 597 uint16_t bytes_to_send, lay_spec; 598 uint8_t *p = ((uint8_t *)(p_msg + 1)) + p_msg->offset; 599 uint16_t event = p_msg->event & MSG_EVT_MASK; 600 uint16_t sub_event = p_msg->event & MSG_SUB_EVT_MASK; 601 uint16_t acl_pkt_size = 0, acl_data_size = 0; 602 uint16_t bytes_sent; 603 604 /* wake up BT device if its in sleep mode */ 605 lpm_wake_assert(); 606 607 if (event == MSG_STACK_TO_HC_HCI_ACL) 608 type = H4_TYPE_ACL_DATA; 609 else if (event == MSG_STACK_TO_HC_HCI_SCO) 610 type = H4_TYPE_SCO_DATA; 611 else if (event == MSG_STACK_TO_HC_HCI_CMD) 612 type = H4_TYPE_COMMAND; 613 614 if (sub_event == LOCAL_BR_EDR_CONTROLLER_ID) 615 { 616 acl_data_size = h4_cb.hc_acl_data_size; 617 acl_pkt_size = h4_cb.hc_acl_data_size + HCI_ACL_PREAMBLE_SIZE; 618 } 619 else 620 { 621 acl_data_size = h4_cb.hc_ble_acl_data_size; 622 acl_pkt_size = h4_cb.hc_ble_acl_data_size + HCI_ACL_PREAMBLE_SIZE; 623 } 624 625 /* Check if sending ACL data that needs fragmenting */ 626 if ((event == MSG_STACK_TO_HC_HCI_ACL) && (p_msg->len > acl_pkt_size)) 627 { 628 /* Get the handle from the packet */ 629 STREAM_TO_UINT16 (handle, p); 630 631 /* Set packet boundary flags to "continuation packet" */ 632 handle = (handle & 0xCFFF) | 0x1000; 633 634 /* Do all the first chunks */ 635 while (p_msg->len > acl_pkt_size) 636 { 637 /* remember layer_specific because uart borrow 638 one byte from layer_specific for packet type */ 639 lay_spec = p_msg->layer_specific; 640 641 p = ((uint8_t *)(p_msg + 1)) + p_msg->offset - 1; 642 *p = type; 643 bytes_to_send = acl_pkt_size + 1; /* packet_size + message type */ 644 645 bytes_sent = userial_write(event,(uint8_t *) p,bytes_to_send); 646 647 /* generate snoop trace message */ 648 btsnoop_capture(p_msg, FALSE); 649 650 p_msg->layer_specific = lay_spec; 651 /* Adjust offset and length for what we just sent */ 652 p_msg->offset += acl_data_size; 653 p_msg->len -= acl_data_size; 654 655 p = ((uint8_t *)(p_msg + 1)) + p_msg->offset; 656 657 UINT16_TO_STREAM (p, handle); 658 659 if (p_msg->len > acl_pkt_size) 660 { 661 UINT16_TO_STREAM (p, acl_data_size); 662 } 663 else 664 { 665 UINT16_TO_STREAM (p, p_msg->len - HCI_ACL_PREAMBLE_SIZE); 666 } 667 668 /* If we were only to send partial buffer, stop when done. */ 669 /* Send the buffer back to L2CAP to send the rest of it later */ 670 if (p_msg->layer_specific) 671 { 672 if (--p_msg->layer_specific == 0) 673 { 674 p_msg->event = MSG_HC_TO_STACK_L2C_SEG_XMIT; 675 676 if (bt_hc_cbacks) 677 { 678 bt_hc_cbacks->tx_result((TRANSAC) p_msg, \ 679 (char *) (p_msg + 1), \ 680 BT_HC_TX_FRAGMENT); 681 } 682 683 return; 684 } 685 } 686 } 687 } 688 689 690 /* remember layer_specific because uart borrow 691 one byte from layer_specific for packet type */ 692 lay_spec = p_msg->layer_specific; 693 694 /* Put the HCI Transport packet type 1 byte before the message */ 695 p = ((uint8_t *)(p_msg + 1)) + p_msg->offset - 1; 696 *p = type; 697 bytes_to_send = p_msg->len + 1; /* message_size + message type */ 698 699 bytes_sent = userial_write(event,(uint8_t *) p, bytes_to_send); 700 701 p_msg->layer_specific = lay_spec; 702 703 if (event == MSG_STACK_TO_HC_HCI_CMD) 704 { 705 num_hci_cmd_pkts--; 706 707 /* If this is an internal Cmd packet, the layer_specific field would 708 * have stored with the opcode of HCI command. 709 * Retrieve the opcode from the Cmd packet. 710 */ 711 p++; 712 STREAM_TO_UINT16(lay_spec, p); 713 } 714 715 /* generate snoop trace message */ 716 btsnoop_capture(p_msg, FALSE); 717 718 if (bt_hc_cbacks) 719 { 720 if ((event == MSG_STACK_TO_HC_HCI_CMD) && \ 721 (h4_cb.int_cmd_rsp_pending > 0) && \ 722 (p_msg->layer_specific == lay_spec)) 723 { 724 /* dealloc buffer of internal command */ 725 bt_hc_cbacks->dealloc((TRANSAC) p_msg, (char *) (p_msg + 1)); 726 } 727 else 728 { 729 bt_hc_cbacks->tx_result((TRANSAC) p_msg, (char *) (p_msg + 1), \ 730 BT_HC_TX_SUCCESS); 731 } 732 } 733 734 lpm_tx_done(TRUE); 735 736 return; 737 } 738 739 740 /******************************************************************************* 741 ** 742 ** Function hci_h4_receive_msg 743 ** 744 ** Description Construct HCI EVENT/ACL packets and send them to stack once 745 ** complete packet has been received. 746 ** 747 ** Returns Number of read bytes 748 ** 749 *******************************************************************************/ 750 uint16_t hci_h4_receive_msg(void) 751 { 752 uint16_t bytes_read = 0; 753 uint8_t byte; 754 uint16_t msg_len, len; 755 uint8_t msg_received; 756 tHCI_H4_CB *p_cb=&h4_cb; 757 758 while (TRUE) 759 { 760 /* Read one byte to see if there is anything waiting to be read */ 761 if (userial_read(0 /*dummy*/, &byte, 1) == 0) 762 { 763 break; 764 } 765 766 bytes_read++; 767 msg_received = FALSE; 768 769 switch (p_cb->rcv_state) 770 { 771 case H4_RX_MSGTYPE_ST: 772 /* Start of new message */ 773 if ((byte < H4_TYPE_ACL_DATA) || (byte > H4_TYPE_EVENT)) 774 { 775 /* Unknown HCI message type */ 776 /* Drop this byte */ 777 ALOGE("[h4] Unknown HCI message type drop this byte 0x%x", byte); 778 break; 779 } 780 781 /* Initialize rx parameters */ 782 p_cb->rcv_msg_type = byte; 783 p_cb->rcv_len = hci_preamble_table[byte-1]; 784 memset(p_cb->preload_buffer, 0 , 6); 785 p_cb->preload_count = 0; 786 // p_cb->p_rcv_msg = NULL; 787 p_cb->rcv_state = H4_RX_LEN_ST; /* Next, wait for length to come */ 788 break; 789 790 case H4_RX_LEN_ST: 791 /* Receiving preamble */ 792 p_cb->preload_buffer[p_cb->preload_count++] = byte; 793 p_cb->rcv_len--; 794 795 /* Check if we received entire preamble yet */ 796 if (p_cb->rcv_len == 0) 797 { 798 if (p_cb->rcv_msg_type == H4_TYPE_ACL_DATA) 799 { 800 /* ACL data lengths are 16-bits */ 801 msg_len = p_cb->preload_buffer[3]; 802 msg_len = (msg_len << 8) + p_cb->preload_buffer[2]; 803 804 if (msg_len && (p_cb->preload_count == 4)) 805 { 806 /* Check if this is a start packet */ 807 byte = ((p_cb->preload_buffer[1] >> 4) & 0x03); 808 809 if (byte == ACL_RX_PKT_START) 810 { 811 /* 812 * A start packet & with non-zero data payload length. 813 * We want to read 2 more bytes to get L2CAP payload 814 * length. 815 */ 816 p_cb->rcv_len = 2; 817 818 break; 819 } 820 } 821 822 /* 823 * Check for segmented packets. If this is a continuation 824 * packet, then we will continue appending data to the 825 * original rcv buffer. 826 */ 827 p_cb->p_rcv_msg = acl_rx_frame_buffer_alloc(); 828 } 829 else 830 { 831 /* Received entire preamble. 832 * Length is in the last received byte */ 833 msg_len = byte; 834 p_cb->rcv_len = msg_len; 835 836 /* Allocate a buffer for message */ 837 if (bt_hc_cbacks) 838 { 839 len = msg_len + p_cb->preload_count + BT_HC_HDR_SIZE; 840 p_cb->p_rcv_msg = \ 841 (HC_BT_HDR *) bt_hc_cbacks->alloc(len); 842 } 843 844 if (p_cb->p_rcv_msg) 845 { 846 /* Initialize buffer with preloaded data */ 847 p_cb->p_rcv_msg->offset = 0; 848 p_cb->p_rcv_msg->layer_specific = 0; 849 p_cb->p_rcv_msg->event = \ 850 msg_evt_table[p_cb->rcv_msg_type-1]; 851 p_cb->p_rcv_msg->len = p_cb->preload_count; 852 memcpy((uint8_t *)(p_cb->p_rcv_msg + 1), \ 853 p_cb->preload_buffer, p_cb->preload_count); 854 } 855 } 856 857 if (p_cb->p_rcv_msg == NULL) 858 { 859 /* Unable to acquire message buffer. */ 860 ALOGE( \ 861 "H4: Unable to acquire buffer for incoming HCI message." \ 862 ); 863 864 if (msg_len == 0) 865 { 866 /* Wait for next message */ 867 p_cb->rcv_state = H4_RX_MSGTYPE_ST; 868 } 869 else 870 { 871 /* Ignore rest of the packet */ 872 p_cb->rcv_state = H4_RX_IGNORE_ST; 873 } 874 875 break; 876 } 877 878 /* Message length is valid */ 879 if (msg_len) 880 { 881 /* Read rest of message */ 882 p_cb->rcv_state = H4_RX_DATA_ST; 883 } 884 else 885 { 886 /* Message has no additional parameters. 887 * (Entire message has been received) */ 888 if (p_cb->rcv_msg_type == H4_TYPE_ACL_DATA) 889 acl_rx_frame_end_chk(); /* to print snoop trace */ 890 891 msg_received = TRUE; 892 893 /* Next, wait for next message */ 894 p_cb->rcv_state = H4_RX_MSGTYPE_ST; 895 } 896 } 897 break; 898 899 case H4_RX_DATA_ST: 900 *((uint8_t *)(p_cb->p_rcv_msg + 1) + p_cb->p_rcv_msg->len++) = byte; 901 p_cb->rcv_len--; 902 903 if (p_cb->rcv_len > 0) 904 { 905 /* Read in the rest of the message */ 906 len = userial_read(0 /*dummy*/, \ 907 ((uint8_t *)(p_cb->p_rcv_msg+1) + p_cb->p_rcv_msg->len), \ 908 p_cb->rcv_len); 909 p_cb->p_rcv_msg->len += len; 910 p_cb->rcv_len -= len; 911 bytes_read += len; 912 } 913 914 /* Check if we read in entire message yet */ 915 if (p_cb->rcv_len == 0) 916 { 917 /* Received entire packet. */ 918 /* Check for segmented l2cap packets */ 919 if ((p_cb->rcv_msg_type == H4_TYPE_ACL_DATA) && 920 !acl_rx_frame_end_chk()) 921 { 922 /* Not the end of packet yet. */ 923 /* Next, wait for next message */ 924 p_cb->rcv_state = H4_RX_MSGTYPE_ST; 925 } 926 else 927 { 928 msg_received = TRUE; 929 /* Next, wait for next message */ 930 p_cb->rcv_state = H4_RX_MSGTYPE_ST; 931 } 932 } 933 break; 934 935 936 case H4_RX_IGNORE_ST: 937 /* Ignore reset of packet */ 938 p_cb->rcv_len--; 939 940 /* Check if we read in entire message yet */ 941 if (p_cb->rcv_len == 0) 942 { 943 /* Next, wait for next message */ 944 p_cb->rcv_state = H4_RX_MSGTYPE_ST; 945 } 946 break; 947 } 948 949 950 /* If we received entire message, then send it to the task */ 951 if (msg_received) 952 { 953 uint8_t intercepted = FALSE; 954 955 /* generate snoop trace message */ 956 /* ACL packet tracing had done in acl_rx_frame_end_chk() */ 957 if (p_cb->p_rcv_msg->event != MSG_HC_TO_STACK_HCI_ACL) 958 btsnoop_capture(p_cb->p_rcv_msg, TRUE); 959 960 if (p_cb->p_rcv_msg->event == MSG_HC_TO_STACK_HCI_EVT) 961 intercepted = internal_event_intercept(); 962 963 if ((bt_hc_cbacks) && (intercepted == FALSE)) 964 { 965 bt_hc_cbacks->data_ind((TRANSAC) p_cb->p_rcv_msg, \ 966 (char *) (p_cb->p_rcv_msg + 1), \ 967 p_cb->p_rcv_msg->len + BT_HC_HDR_SIZE); 968 } 969 p_cb->p_rcv_msg = NULL; 970 } 971 } 972 973 return (bytes_read); 974 } 975 976 977 /******************************************************************************* 978 ** 979 ** Function hci_h4_send_int_cmd 980 ** 981 ** Description Place the internal commands (issued internally by vendor lib) 982 ** in the tx_q. 983 ** 984 ** Returns TRUE/FALSE 985 ** 986 *******************************************************************************/ 987 uint8_t hci_h4_send_int_cmd(uint16_t opcode, HC_BT_HDR *p_buf, \ 988 tINT_CMD_CBACK p_cback) 989 { 990 if (h4_cb.int_cmd_rsp_pending > INT_CMD_PKT_MAX_COUNT) 991 { 992 ALOGE( \ 993 "Allow only %d outstanding internal commands at a time [Reject 0x%04X]"\ 994 , INT_CMD_PKT_MAX_COUNT, opcode); 995 return FALSE; 996 } 997 998 h4_cb.int_cmd_rsp_pending++; 999 h4_cb.int_cmd[h4_cb.int_cmd_wrt_idx].opcode = opcode; 1000 h4_cb.int_cmd[h4_cb.int_cmd_wrt_idx].cback = p_cback; 1001 h4_cb.int_cmd_wrt_idx = ((h4_cb.int_cmd_wrt_idx+1) & INT_CMD_PKT_IDX_MASK); 1002 1003 /* stamp signature to indicate an internal command */ 1004 p_buf->layer_specific = opcode; 1005 1006 utils_enqueue(&tx_q, (void *) p_buf); 1007 bthc_signal_event(HC_EVENT_TX); 1008 1009 return TRUE; 1010 } 1011 1012 1013 /******************************************************************************* 1014 ** 1015 ** Function hci_h4_get_acl_data_length 1016 ** 1017 ** Description Issue HCI_READ_BUFFER_SIZE command to retrieve Controller's 1018 ** ACL data length setting 1019 ** 1020 ** Returns None 1021 ** 1022 *******************************************************************************/ 1023 void hci_h4_get_acl_data_length(void) 1024 { 1025 HC_BT_HDR *p_buf = NULL; 1026 uint8_t *p, ret; 1027 1028 if (bt_hc_cbacks) 1029 { 1030 p_buf = (HC_BT_HDR *) bt_hc_cbacks->alloc(BT_HC_HDR_SIZE + \ 1031 HCI_CMD_PREAMBLE_SIZE); 1032 } 1033 1034 if (p_buf) 1035 { 1036 p_buf->event = MSG_STACK_TO_HC_HCI_CMD; 1037 p_buf->offset = 0; 1038 p_buf->layer_specific = 0; 1039 p_buf->len = HCI_CMD_PREAMBLE_SIZE; 1040 1041 p = (uint8_t *) (p_buf + 1); 1042 UINT16_TO_STREAM(p, HCI_READ_BUFFER_SIZE); 1043 *p = 0; 1044 1045 if ((ret = hci_h4_send_int_cmd(HCI_READ_BUFFER_SIZE, p_buf, \ 1046 get_acl_data_length_cback)) == FALSE) 1047 { 1048 bt_hc_cbacks->dealloc((TRANSAC) p_buf, (char *) (p_buf + 1)); 1049 } 1050 else 1051 return; 1052 } 1053 1054 if (bt_hc_cbacks) 1055 { 1056 ALOGE("vendor lib postload aborted"); 1057 bt_hc_cbacks->postload_cb(NULL, BT_HC_POSTLOAD_FAIL); 1058 } 1059 } 1060 1061 1062 /****************************************************************************** 1063 ** HCI H4 Services interface table 1064 ******************************************************************************/ 1065 1066 const tHCI_IF hci_h4_func_table = 1067 { 1068 hci_h4_init, 1069 hci_h4_cleanup, 1070 hci_h4_send_msg, 1071 hci_h4_send_int_cmd, 1072 hci_h4_get_acl_data_length, 1073 hci_h4_receive_msg 1074 }; 1075 1076
