1 /* 2 * 3 * Bluetooth HCI UART driver 4 * 5 * Copyright (C) 2000-2001 Qualcomm Incorporated 6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> 7 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26 #include <linux/module.h> 27 28 #include <linux/kernel.h> 29 #include <linux/init.h> 30 #include <linux/types.h> 31 #include <linux/fcntl.h> 32 #include <linux/interrupt.h> 33 #include <linux/ptrace.h> 34 #include <linux/poll.h> 35 36 #include <linux/slab.h> 37 #include <linux/tty.h> 38 #include <linux/errno.h> 39 #include <linux/string.h> 40 #include <linux/signal.h> 41 #include <linux/ioctl.h> 42 #include <linux/skbuff.h> 43 #include <linux/firmware.h> 44 45 #include <net/bluetooth/bluetooth.h> 46 #include <net/bluetooth/hci_core.h> 47 48 #include "btintel.h" 49 #include "btbcm.h" 50 #include "hci_uart.h" 51 52 #define VERSION "2.3" 53 54 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; 55 56 int hci_uart_register_proto(const struct hci_uart_proto *p) 57 { 58 if (p->id >= HCI_UART_MAX_PROTO) 59 return -EINVAL; 60 61 if (hup[p->id]) 62 return -EEXIST; 63 64 hup[p->id] = p; 65 66 BT_INFO("HCI UART protocol %s registered", p->name); 67 68 return 0; 69 } 70 71 int hci_uart_unregister_proto(const struct hci_uart_proto *p) 72 { 73 if (p->id >= HCI_UART_MAX_PROTO) 74 return -EINVAL; 75 76 if (!hup[p->id]) 77 return -EINVAL; 78 79 hup[p->id] = NULL; 80 81 return 0; 82 } 83 84 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id) 85 { 86 if (id >= HCI_UART_MAX_PROTO) 87 return NULL; 88 89 return hup[id]; 90 } 91 92 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) 93 { 94 struct hci_dev *hdev = hu->hdev; 95 96 /* Update HCI stat counters */ 97 switch (pkt_type) { 98 case HCI_COMMAND_PKT: 99 hdev->stat.cmd_tx++; 100 break; 101 102 case HCI_ACLDATA_PKT: 103 hdev->stat.acl_tx++; 104 break; 105 106 case HCI_SCODATA_PKT: 107 hdev->stat.sco_tx++; 108 break; 109 } 110 } 111 112 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) 113 { 114 struct sk_buff *skb = hu->tx_skb; 115 116 if (!skb) { 117 read_lock(&hu->proto_lock); 118 119 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 120 skb = hu->proto->dequeue(hu); 121 122 read_unlock(&hu->proto_lock); 123 } else { 124 hu->tx_skb = NULL; 125 } 126 127 return skb; 128 } 129 130 int hci_uart_tx_wakeup(struct hci_uart *hu) 131 { 132 read_lock(&hu->proto_lock); 133 134 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) 135 goto no_schedule; 136 137 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { 138 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 139 goto no_schedule; 140 } 141 142 BT_DBG(""); 143 144 schedule_work(&hu->write_work); 145 146 no_schedule: 147 read_unlock(&hu->proto_lock); 148 149 return 0; 150 } 151 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); 152 153 static void hci_uart_write_work(struct work_struct *work) 154 { 155 struct hci_uart *hu = container_of(work, struct hci_uart, write_work); 156 struct tty_struct *tty = hu->tty; 157 struct hci_dev *hdev = hu->hdev; 158 struct sk_buff *skb; 159 160 /* REVISIT: should we cope with bad skbs or ->write() returning 161 * and error value ? 162 */ 163 164 restart: 165 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 166 167 while ((skb = hci_uart_dequeue(hu))) { 168 int len; 169 170 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 171 len = tty->ops->write(tty, skb->data, skb->len); 172 hdev->stat.byte_tx += len; 173 174 skb_pull(skb, len); 175 if (skb->len) { 176 hu->tx_skb = skb; 177 break; 178 } 179 180 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); 181 kfree_skb(skb); 182 } 183 184 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) 185 goto restart; 186 187 clear_bit(HCI_UART_SENDING, &hu->tx_state); 188 } 189 190 static void hci_uart_init_work(struct work_struct *work) 191 { 192 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); 193 int err; 194 struct hci_dev *hdev; 195 196 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 197 return; 198 199 err = hci_register_dev(hu->hdev); 200 if (err < 0) { 201 BT_ERR("Can't register HCI device"); 202 hdev = hu->hdev; 203 hu->hdev = NULL; 204 hci_free_dev(hdev); 205 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 206 hu->proto->close(hu); 207 return; 208 } 209 210 set_bit(HCI_UART_REGISTERED, &hu->flags); 211 } 212 213 int hci_uart_init_ready(struct hci_uart *hu) 214 { 215 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 216 return -EALREADY; 217 218 schedule_work(&hu->init_ready); 219 220 return 0; 221 } 222 223 /* ------- Interface to HCI layer ------ */ 224 /* Initialize device */ 225 static int hci_uart_open(struct hci_dev *hdev) 226 { 227 BT_DBG("%s %p", hdev->name, hdev); 228 229 /* Nothing to do for UART driver */ 230 return 0; 231 } 232 233 /* Reset device */ 234 static int hci_uart_flush(struct hci_dev *hdev) 235 { 236 struct hci_uart *hu = hci_get_drvdata(hdev); 237 struct tty_struct *tty = hu->tty; 238 239 BT_DBG("hdev %p tty %p", hdev, tty); 240 241 if (hu->tx_skb) { 242 kfree_skb(hu->tx_skb); hu->tx_skb = NULL; 243 } 244 245 /* Flush any pending characters in the driver and discipline. */ 246 tty_ldisc_flush(tty); 247 tty_driver_flush_buffer(tty); 248 249 read_lock(&hu->proto_lock); 250 251 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 252 hu->proto->flush(hu); 253 254 read_unlock(&hu->proto_lock); 255 256 return 0; 257 } 258 259 /* Close device */ 260 static int hci_uart_close(struct hci_dev *hdev) 261 { 262 BT_DBG("hdev %p", hdev); 263 264 hci_uart_flush(hdev); 265 hdev->flush = NULL; 266 return 0; 267 } 268 269 /* Send frames from HCI layer */ 270 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 271 { 272 struct hci_uart *hu = hci_get_drvdata(hdev); 273 274 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), 275 skb->len); 276 277 read_lock(&hu->proto_lock); 278 279 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 280 read_unlock(&hu->proto_lock); 281 return -EUNATCH; 282 } 283 284 hu->proto->enqueue(hu, skb); 285 read_unlock(&hu->proto_lock); 286 287 hci_uart_tx_wakeup(hu); 288 289 return 0; 290 } 291 292 /* Flow control or un-flow control the device */ 293 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) 294 { 295 struct tty_struct *tty = hu->tty; 296 struct ktermios ktermios; 297 int status; 298 unsigned int set = 0; 299 unsigned int clear = 0; 300 301 if (enable) { 302 /* Disable hardware flow control */ 303 ktermios = tty->termios; 304 ktermios.c_cflag &= ~CRTSCTS; 305 status = tty_set_termios(tty, &ktermios); 306 BT_DBG("Disabling hardware flow control: %s", 307 status ? "failed" : "success"); 308 309 /* Clear RTS to prevent the device from sending */ 310 /* Most UARTs need OUT2 to enable interrupts */ 311 status = tty->driver->ops->tiocmget(tty); 312 BT_DBG("Current tiocm 0x%x", status); 313 314 set &= ~(TIOCM_OUT2 | TIOCM_RTS); 315 clear = ~set; 316 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 317 TIOCM_OUT2 | TIOCM_LOOP; 318 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 319 TIOCM_OUT2 | TIOCM_LOOP; 320 status = tty->driver->ops->tiocmset(tty, set, clear); 321 BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); 322 } else { 323 /* Set RTS to allow the device to send again */ 324 status = tty->driver->ops->tiocmget(tty); 325 BT_DBG("Current tiocm 0x%x", status); 326 327 set |= (TIOCM_OUT2 | TIOCM_RTS); 328 clear = ~set; 329 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 330 TIOCM_OUT2 | TIOCM_LOOP; 331 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 332 TIOCM_OUT2 | TIOCM_LOOP; 333 status = tty->driver->ops->tiocmset(tty, set, clear); 334 BT_DBG("Setting RTS: %s", status ? "failed" : "success"); 335 336 /* Re-enable hardware flow control */ 337 ktermios = tty->termios; 338 ktermios.c_cflag |= CRTSCTS; 339 status = tty_set_termios(tty, &ktermios); 340 BT_DBG("Enabling hardware flow control: %s", 341 status ? "failed" : "success"); 342 } 343 } 344 345 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, 346 unsigned int oper_speed) 347 { 348 hu->init_speed = init_speed; 349 hu->oper_speed = oper_speed; 350 } 351 352 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) 353 { 354 struct tty_struct *tty = hu->tty; 355 struct ktermios ktermios; 356 357 ktermios = tty->termios; 358 ktermios.c_cflag &= ~CBAUD; 359 tty_termios_encode_baud_rate(&ktermios, speed, speed); 360 361 /* tty_set_termios() return not checked as it is always 0 */ 362 tty_set_termios(tty, &ktermios); 363 364 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, 365 tty->termios.c_ispeed, tty->termios.c_ospeed); 366 } 367 368 static int hci_uart_setup(struct hci_dev *hdev) 369 { 370 struct hci_uart *hu = hci_get_drvdata(hdev); 371 struct hci_rp_read_local_version *ver; 372 struct sk_buff *skb; 373 unsigned int speed; 374 int err; 375 376 /* Init speed if any */ 377 if (hu->init_speed) 378 speed = hu->init_speed; 379 else if (hu->proto->init_speed) 380 speed = hu->proto->init_speed; 381 else 382 speed = 0; 383 384 if (speed) 385 hci_uart_set_baudrate(hu, speed); 386 387 /* Operational speed if any */ 388 if (hu->oper_speed) 389 speed = hu->oper_speed; 390 else if (hu->proto->oper_speed) 391 speed = hu->proto->oper_speed; 392 else 393 speed = 0; 394 395 if (hu->proto->set_baudrate && speed) { 396 err = hu->proto->set_baudrate(hu, speed); 397 if (!err) 398 hci_uart_set_baudrate(hu, speed); 399 } 400 401 if (hu->proto->setup) 402 return hu->proto->setup(hu); 403 404 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) 405 return 0; 406 407 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 408 HCI_INIT_TIMEOUT); 409 if (IS_ERR(skb)) { 410 BT_ERR("%s: Reading local version information failed (%ld)", 411 hdev->name, PTR_ERR(skb)); 412 return 0; 413 } 414 415 if (skb->len != sizeof(*ver)) { 416 BT_ERR("%s: Event length mismatch for version information", 417 hdev->name); 418 goto done; 419 } 420 421 ver = (struct hci_rp_read_local_version *)skb->data; 422 423 switch (le16_to_cpu(ver->manufacturer)) { 424 #ifdef CONFIG_BT_HCIUART_INTEL 425 case 2: 426 hdev->set_bdaddr = btintel_set_bdaddr; 427 btintel_check_bdaddr(hdev); 428 break; 429 #endif 430 #ifdef CONFIG_BT_HCIUART_BCM 431 case 15: 432 hdev->set_bdaddr = btbcm_set_bdaddr; 433 btbcm_check_bdaddr(hdev); 434 break; 435 #endif 436 } 437 438 done: 439 kfree_skb(skb); 440 return 0; 441 } 442 443 /* ------ LDISC part ------ */ 444 /* hci_uart_tty_open 445 * 446 * Called when line discipline changed to HCI_UART. 447 * 448 * Arguments: 449 * tty pointer to tty info structure 450 * Return Value: 451 * 0 if success, otherwise error code 452 */ 453 static int hci_uart_tty_open(struct tty_struct *tty) 454 { 455 struct hci_uart *hu; 456 457 BT_DBG("tty %p", tty); 458 459 /* Error if the tty has no write op instead of leaving an exploitable 460 * hole 461 */ 462 if (tty->ops->write == NULL) 463 return -EOPNOTSUPP; 464 465 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 466 if (!hu) { 467 BT_ERR("Can't allocate control structure"); 468 return -ENFILE; 469 } 470 471 tty->disc_data = hu; 472 hu->tty = tty; 473 tty->receive_room = 65536; 474 475 /* disable alignment support by default */ 476 hu->alignment = 1; 477 hu->padding = 0; 478 479 INIT_WORK(&hu->init_ready, hci_uart_init_work); 480 INIT_WORK(&hu->write_work, hci_uart_write_work); 481 482 rwlock_init(&hu->proto_lock); 483 484 /* Flush any pending characters in the driver */ 485 tty_driver_flush_buffer(tty); 486 487 return 0; 488 } 489 490 /* hci_uart_tty_close() 491 * 492 * Called when the line discipline is changed to something 493 * else, the tty is closed, or the tty detects a hangup. 494 */ 495 static void hci_uart_tty_close(struct tty_struct *tty) 496 { 497 struct hci_uart *hu = tty->disc_data; 498 struct hci_dev *hdev; 499 unsigned long flags; 500 501 BT_DBG("tty %p", tty); 502 503 /* Detach from the tty */ 504 tty->disc_data = NULL; 505 506 if (!hu) 507 return; 508 509 hdev = hu->hdev; 510 if (hdev) 511 hci_uart_close(hdev); 512 513 cancel_work_sync(&hu->write_work); 514 515 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 516 write_lock_irqsave(&hu->proto_lock, flags); 517 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 518 write_unlock_irqrestore(&hu->proto_lock, flags); 519 520 if (hdev) { 521 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 522 hci_unregister_dev(hdev); 523 hci_free_dev(hdev); 524 } 525 hu->proto->close(hu); 526 } 527 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 528 529 kfree(hu); 530 } 531 532 /* hci_uart_tty_wakeup() 533 * 534 * Callback for transmit wakeup. Called when low level 535 * device driver can accept more send data. 536 * 537 * Arguments: tty pointer to associated tty instance data 538 * Return Value: None 539 */ 540 static void hci_uart_tty_wakeup(struct tty_struct *tty) 541 { 542 struct hci_uart *hu = tty->disc_data; 543 544 BT_DBG(""); 545 546 if (!hu) 547 return; 548 549 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 550 551 if (tty != hu->tty) 552 return; 553 554 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 555 hci_uart_tx_wakeup(hu); 556 } 557 558 /* hci_uart_tty_receive() 559 * 560 * Called by tty low level driver when receive data is 561 * available. 562 * 563 * Arguments: tty pointer to tty isntance data 564 * data pointer to received data 565 * flags pointer to flags for data 566 * count count of received data in bytes 567 * 568 * Return Value: None 569 */ 570 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 571 char *flags, int count) 572 { 573 struct hci_uart *hu = tty->disc_data; 574 575 if (!hu || tty != hu->tty) 576 return; 577 578 read_lock(&hu->proto_lock); 579 580 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 581 read_unlock(&hu->proto_lock); 582 return; 583 } 584 585 /* It does not need a lock here as it is already protected by a mutex in 586 * tty caller 587 */ 588 hu->proto->recv(hu, data, count); 589 read_unlock(&hu->proto_lock); 590 591 if (hu->hdev) 592 hu->hdev->stat.byte_rx += count; 593 594 tty_unthrottle(tty); 595 } 596 597 static int hci_uart_register_dev(struct hci_uart *hu) 598 { 599 struct hci_dev *hdev; 600 601 BT_DBG(""); 602 603 /* Initialize and register HCI device */ 604 hdev = hci_alloc_dev(); 605 if (!hdev) { 606 BT_ERR("Can't allocate HCI device"); 607 return -ENOMEM; 608 } 609 610 hu->hdev = hdev; 611 612 hdev->bus = HCI_UART; 613 hci_set_drvdata(hdev, hu); 614 615 /* Only when vendor specific setup callback is provided, consider 616 * the manufacturer information valid. This avoids filling in the 617 * value for Ericsson when nothing is specified. 618 */ 619 if (hu->proto->setup) 620 hdev->manufacturer = hu->proto->manufacturer; 621 622 hdev->open = hci_uart_open; 623 hdev->close = hci_uart_close; 624 hdev->flush = hci_uart_flush; 625 hdev->send = hci_uart_send_frame; 626 hdev->setup = hci_uart_setup; 627 SET_HCIDEV_DEV(hdev, hu->tty->dev); 628 629 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 630 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 631 632 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 633 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 634 635 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 636 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 637 638 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) 639 hdev->dev_type = HCI_AMP; 640 else 641 hdev->dev_type = HCI_PRIMARY; 642 643 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 644 return 0; 645 646 if (hci_register_dev(hdev) < 0) { 647 BT_ERR("Can't register HCI device"); 648 hu->hdev = NULL; 649 hci_free_dev(hdev); 650 return -ENODEV; 651 } 652 653 set_bit(HCI_UART_REGISTERED, &hu->flags); 654 655 return 0; 656 } 657 658 static int hci_uart_set_proto(struct hci_uart *hu, int id) 659 { 660 const struct hci_uart_proto *p; 661 int err; 662 663 p = hci_uart_get_proto(id); 664 if (!p) 665 return -EPROTONOSUPPORT; 666 667 err = p->open(hu); 668 if (err) 669 return err; 670 671 hu->proto = p; 672 set_bit(HCI_UART_PROTO_READY, &hu->flags); 673 674 err = hci_uart_register_dev(hu); 675 if (err) { 676 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 677 p->close(hu); 678 return err; 679 } 680 681 return 0; 682 } 683 684 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 685 { 686 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 687 BIT(HCI_UART_RESET_ON_INIT) | 688 BIT(HCI_UART_CREATE_AMP) | 689 BIT(HCI_UART_INIT_PENDING) | 690 BIT(HCI_UART_EXT_CONFIG) | 691 BIT(HCI_UART_VND_DETECT); 692 693 if (flags & ~valid_flags) 694 return -EINVAL; 695 696 hu->hdev_flags = flags; 697 698 return 0; 699 } 700 701 /* hci_uart_tty_ioctl() 702 * 703 * Process IOCTL system call for the tty device. 704 * 705 * Arguments: 706 * 707 * tty pointer to tty instance data 708 * file pointer to open file object for device 709 * cmd IOCTL command code 710 * arg argument for IOCTL call (cmd dependent) 711 * 712 * Return Value: Command dependent 713 */ 714 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 715 unsigned int cmd, unsigned long arg) 716 { 717 struct hci_uart *hu = tty->disc_data; 718 int err = 0; 719 720 BT_DBG(""); 721 722 /* Verify the status of the device */ 723 if (!hu) 724 return -EBADF; 725 726 switch (cmd) { 727 case HCIUARTSETPROTO: 728 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 729 err = hci_uart_set_proto(hu, arg); 730 if (err) 731 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 732 } else 733 err = -EBUSY; 734 break; 735 736 case HCIUARTGETPROTO: 737 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 738 err = hu->proto->id; 739 else 740 err = -EUNATCH; 741 break; 742 743 case HCIUARTGETDEVICE: 744 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 745 err = hu->hdev->id; 746 else 747 err = -EUNATCH; 748 break; 749 750 case HCIUARTSETFLAGS: 751 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 752 err = -EBUSY; 753 else 754 err = hci_uart_set_flags(hu, arg); 755 break; 756 757 case HCIUARTGETFLAGS: 758 err = hu->hdev_flags; 759 break; 760 761 default: 762 err = n_tty_ioctl_helper(tty, file, cmd, arg); 763 break; 764 } 765 766 return err; 767 } 768 769 /* 770 * We don't provide read/write/poll interface for user space. 771 */ 772 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 773 unsigned char __user *buf, size_t nr) 774 { 775 return 0; 776 } 777 778 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 779 const unsigned char *data, size_t count) 780 { 781 return 0; 782 } 783 784 static unsigned int hci_uart_tty_poll(struct tty_struct *tty, 785 struct file *filp, poll_table *wait) 786 { 787 return 0; 788 } 789 790 static int __init hci_uart_init(void) 791 { 792 static struct tty_ldisc_ops hci_uart_ldisc; 793 int err; 794 795 BT_INFO("HCI UART driver ver %s", VERSION); 796 797 /* Register the tty discipline */ 798 799 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 800 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 801 hci_uart_ldisc.name = "n_hci"; 802 hci_uart_ldisc.open = hci_uart_tty_open; 803 hci_uart_ldisc.close = hci_uart_tty_close; 804 hci_uart_ldisc.read = hci_uart_tty_read; 805 hci_uart_ldisc.write = hci_uart_tty_write; 806 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 807 hci_uart_ldisc.poll = hci_uart_tty_poll; 808 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 809 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 810 hci_uart_ldisc.owner = THIS_MODULE; 811 812 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 813 if (err) { 814 BT_ERR("HCI line discipline registration failed. (%d)", err); 815 return err; 816 } 817 818 #ifdef CONFIG_BT_HCIUART_H4 819 h4_init(); 820 #endif 821 #ifdef CONFIG_BT_HCIUART_BCSP 822 bcsp_init(); 823 #endif 824 #ifdef CONFIG_BT_HCIUART_LL 825 ll_init(); 826 #endif 827 #ifdef CONFIG_BT_HCIUART_ATH3K 828 ath_init(); 829 #endif 830 #ifdef CONFIG_BT_HCIUART_3WIRE 831 h5_init(); 832 #endif 833 #ifdef CONFIG_BT_HCIUART_INTEL 834 intel_init(); 835 #endif 836 #ifdef CONFIG_BT_HCIUART_BCM 837 bcm_init(); 838 #endif 839 #ifdef CONFIG_BT_HCIUART_QCA 840 qca_init(); 841 #endif 842 #ifdef CONFIG_BT_HCIUART_AG6XX 843 ag6xx_init(); 844 #endif 845 #ifdef CONFIG_BT_HCIUART_MRVL 846 mrvl_init(); 847 #endif 848 849 return 0; 850 } 851 852 static void __exit hci_uart_exit(void) 853 { 854 int err; 855 856 #ifdef CONFIG_BT_HCIUART_H4 857 h4_deinit(); 858 #endif 859 #ifdef CONFIG_BT_HCIUART_BCSP 860 bcsp_deinit(); 861 #endif 862 #ifdef CONFIG_BT_HCIUART_LL 863 ll_deinit(); 864 #endif 865 #ifdef CONFIG_BT_HCIUART_ATH3K 866 ath_deinit(); 867 #endif 868 #ifdef CONFIG_BT_HCIUART_3WIRE 869 h5_deinit(); 870 #endif 871 #ifdef CONFIG_BT_HCIUART_INTEL 872 intel_deinit(); 873 #endif 874 #ifdef CONFIG_BT_HCIUART_BCM 875 bcm_deinit(); 876 #endif 877 #ifdef CONFIG_BT_HCIUART_QCA 878 qca_deinit(); 879 #endif 880 #ifdef CONFIG_BT_HCIUART_AG6XX 881 ag6xx_deinit(); 882 #endif 883 #ifdef CONFIG_BT_HCIUART_MRVL 884 mrvl_deinit(); 885 #endif 886 887 /* Release tty registration of line discipline */ 888 err = tty_unregister_ldisc(N_HCI); 889 if (err) 890 BT_ERR("Can't unregister HCI line discipline (%d)", err); 891 } 892 893 module_init(hci_uart_init); 894 module_exit(hci_uart_exit); 895 896 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 897 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 898 MODULE_VERSION(VERSION); 899 MODULE_LICENSE("GPL"); 900 MODULE_ALIAS_LDISC(N_HCI); 901