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 if (tty->ops->write == NULL) 462 return -EOPNOTSUPP; 463 464 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 465 if (!hu) { 466 BT_ERR("Can't allocate control structure"); 467 return -ENFILE; 468 } 469 470 tty->disc_data = hu; 471 hu->tty = tty; 472 tty->receive_room = 65536; 473 474 /* disable alignment support by default */ 475 hu->alignment = 1; 476 hu->padding = 0; 477 478 INIT_WORK(&hu->init_ready, hci_uart_init_work); 479 INIT_WORK(&hu->write_work, hci_uart_write_work); 480 481 rwlock_init(&hu->proto_lock); 482 483 /* Flush any pending characters in the driver */ 484 tty_driver_flush_buffer(tty); 485 486 return 0; 487 } 488 489 /* hci_uart_tty_close() 490 * 491 * Called when the line discipline is changed to something 492 * else, the tty is closed, or the tty detects a hangup. 493 */ 494 static void hci_uart_tty_close(struct tty_struct *tty) 495 { 496 struct hci_uart *hu = tty->disc_data; 497 struct hci_dev *hdev; 498 unsigned long flags; 499 500 BT_DBG("tty %p", tty); 501 502 /* Detach from the tty */ 503 tty->disc_data = NULL; 504 505 if (!hu) 506 return; 507 508 hdev = hu->hdev; 509 if (hdev) 510 hci_uart_close(hdev); 511 512 cancel_work_sync(&hu->write_work); 513 514 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 515 write_lock_irqsave(&hu->proto_lock, flags); 516 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 517 write_unlock_irqrestore(&hu->proto_lock, flags); 518 519 if (hdev) { 520 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 521 hci_unregister_dev(hdev); 522 hci_free_dev(hdev); 523 } 524 hu->proto->close(hu); 525 } 526 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 527 528 kfree(hu); 529 } 530 531 /* hci_uart_tty_wakeup() 532 * 533 * Callback for transmit wakeup. Called when low level 534 * device driver can accept more send data. 535 * 536 * Arguments: tty pointer to associated tty instance data 537 * Return Value: None 538 */ 539 static void hci_uart_tty_wakeup(struct tty_struct *tty) 540 { 541 struct hci_uart *hu = tty->disc_data; 542 543 BT_DBG(""); 544 545 if (!hu) 546 return; 547 548 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 549 550 if (tty != hu->tty) 551 return; 552 553 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 554 hci_uart_tx_wakeup(hu); 555 } 556 557 /* hci_uart_tty_receive() 558 * 559 * Called by tty low level driver when receive data is 560 * available. 561 * 562 * Arguments: tty pointer to tty isntance data 563 * data pointer to received data 564 * flags pointer to flags for data 565 * count count of received data in bytes 566 * 567 * Return Value: None 568 */ 569 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 570 char *flags, int count) 571 { 572 struct hci_uart *hu = tty->disc_data; 573 574 if (!hu || tty != hu->tty) 575 return; 576 577 read_lock(&hu->proto_lock); 578 579 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 580 read_unlock(&hu->proto_lock); 581 return; 582 } 583 584 /* It does not need a lock here as it is already protected by a mutex in 585 * tty caller 586 */ 587 hu->proto->recv(hu, data, count); 588 read_unlock(&hu->proto_lock); 589 590 if (hu->hdev) 591 hu->hdev->stat.byte_rx += count; 592 593 tty_unthrottle(tty); 594 } 595 596 static int hci_uart_register_dev(struct hci_uart *hu) 597 { 598 struct hci_dev *hdev; 599 600 BT_DBG(""); 601 602 /* Initialize and register HCI device */ 603 hdev = hci_alloc_dev(); 604 if (!hdev) { 605 BT_ERR("Can't allocate HCI device"); 606 return -ENOMEM; 607 } 608 609 hu->hdev = hdev; 610 611 hdev->bus = HCI_UART; 612 hci_set_drvdata(hdev, hu); 613 614 /* Only when vendor specific setup callback is provided, consider 615 * the manufacturer information valid. This avoids filling in the 616 * value for Ericsson when nothing is specified. 617 */ 618 if (hu->proto->setup) 619 hdev->manufacturer = hu->proto->manufacturer; 620 621 hdev->open = hci_uart_open; 622 hdev->close = hci_uart_close; 623 hdev->flush = hci_uart_flush; 624 hdev->send = hci_uart_send_frame; 625 hdev->setup = hci_uart_setup; 626 SET_HCIDEV_DEV(hdev, hu->tty->dev); 627 628 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 629 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 630 631 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 632 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 633 634 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 635 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 636 637 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) 638 hdev->dev_type = HCI_AMP; 639 else 640 hdev->dev_type = HCI_PRIMARY; 641 642 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 643 return 0; 644 645 if (hci_register_dev(hdev) < 0) { 646 BT_ERR("Can't register HCI device"); 647 hu->hdev = NULL; 648 hci_free_dev(hdev); 649 return -ENODEV; 650 } 651 652 set_bit(HCI_UART_REGISTERED, &hu->flags); 653 654 return 0; 655 } 656 657 static int hci_uart_set_proto(struct hci_uart *hu, int id) 658 { 659 const struct hci_uart_proto *p; 660 int err; 661 662 p = hci_uart_get_proto(id); 663 if (!p) 664 return -EPROTONOSUPPORT; 665 666 err = p->open(hu); 667 if (err) 668 return err; 669 670 hu->proto = p; 671 set_bit(HCI_UART_PROTO_READY, &hu->flags); 672 673 err = hci_uart_register_dev(hu); 674 if (err) { 675 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 676 p->close(hu); 677 return err; 678 } 679 680 return 0; 681 } 682 683 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 684 { 685 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 686 BIT(HCI_UART_RESET_ON_INIT) | 687 BIT(HCI_UART_CREATE_AMP) | 688 BIT(HCI_UART_INIT_PENDING) | 689 BIT(HCI_UART_EXT_CONFIG) | 690 BIT(HCI_UART_VND_DETECT); 691 692 if (flags & ~valid_flags) 693 return -EINVAL; 694 695 hu->hdev_flags = flags; 696 697 return 0; 698 } 699 700 /* hci_uart_tty_ioctl() 701 * 702 * Process IOCTL system call for the tty device. 703 * 704 * Arguments: 705 * 706 * tty pointer to tty instance data 707 * file pointer to open file object for device 708 * cmd IOCTL command code 709 * arg argument for IOCTL call (cmd dependent) 710 * 711 * Return Value: Command dependent 712 */ 713 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 714 unsigned int cmd, unsigned long arg) 715 { 716 struct hci_uart *hu = tty->disc_data; 717 int err = 0; 718 719 BT_DBG(""); 720 721 /* Verify the status of the device */ 722 if (!hu) 723 return -EBADF; 724 725 switch (cmd) { 726 case HCIUARTSETPROTO: 727 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 728 err = hci_uart_set_proto(hu, arg); 729 if (err) 730 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 731 } else 732 err = -EBUSY; 733 break; 734 735 case HCIUARTGETPROTO: 736 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 737 err = hu->proto->id; 738 else 739 err = -EUNATCH; 740 break; 741 742 case HCIUARTGETDEVICE: 743 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 744 err = hu->hdev->id; 745 else 746 err = -EUNATCH; 747 break; 748 749 case HCIUARTSETFLAGS: 750 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 751 err = -EBUSY; 752 else 753 err = hci_uart_set_flags(hu, arg); 754 break; 755 756 case HCIUARTGETFLAGS: 757 err = hu->hdev_flags; 758 break; 759 760 default: 761 err = n_tty_ioctl_helper(tty, file, cmd, arg); 762 break; 763 } 764 765 return err; 766 } 767 768 /* 769 * We don't provide read/write/poll interface for user space. 770 */ 771 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 772 unsigned char __user *buf, size_t nr) 773 { 774 return 0; 775 } 776 777 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 778 const unsigned char *data, size_t count) 779 { 780 return 0; 781 } 782 783 static unsigned int hci_uart_tty_poll(struct tty_struct *tty, 784 struct file *filp, poll_table *wait) 785 { 786 return 0; 787 } 788 789 static int __init hci_uart_init(void) 790 { 791 static struct tty_ldisc_ops hci_uart_ldisc; 792 int err; 793 794 BT_INFO("HCI UART driver ver %s", VERSION); 795 796 /* Register the tty discipline */ 797 798 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 799 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 800 hci_uart_ldisc.name = "n_hci"; 801 hci_uart_ldisc.open = hci_uart_tty_open; 802 hci_uart_ldisc.close = hci_uart_tty_close; 803 hci_uart_ldisc.read = hci_uart_tty_read; 804 hci_uart_ldisc.write = hci_uart_tty_write; 805 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 806 hci_uart_ldisc.poll = hci_uart_tty_poll; 807 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 808 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 809 hci_uart_ldisc.owner = THIS_MODULE; 810 811 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 812 if (err) { 813 BT_ERR("HCI line discipline registration failed. (%d)", err); 814 return err; 815 } 816 817 #ifdef CONFIG_BT_HCIUART_H4 818 h4_init(); 819 #endif 820 #ifdef CONFIG_BT_HCIUART_BCSP 821 bcsp_init(); 822 #endif 823 #ifdef CONFIG_BT_HCIUART_LL 824 ll_init(); 825 #endif 826 #ifdef CONFIG_BT_HCIUART_ATH3K 827 ath_init(); 828 #endif 829 #ifdef CONFIG_BT_HCIUART_3WIRE 830 h5_init(); 831 #endif 832 #ifdef CONFIG_BT_HCIUART_INTEL 833 intel_init(); 834 #endif 835 #ifdef CONFIG_BT_HCIUART_BCM 836 bcm_init(); 837 #endif 838 #ifdef CONFIG_BT_HCIUART_QCA 839 qca_init(); 840 #endif 841 #ifdef CONFIG_BT_HCIUART_AG6XX 842 ag6xx_init(); 843 #endif 844 #ifdef CONFIG_BT_HCIUART_MRVL 845 mrvl_init(); 846 #endif 847 848 return 0; 849 } 850 851 static void __exit hci_uart_exit(void) 852 { 853 int err; 854 855 #ifdef CONFIG_BT_HCIUART_H4 856 h4_deinit(); 857 #endif 858 #ifdef CONFIG_BT_HCIUART_BCSP 859 bcsp_deinit(); 860 #endif 861 #ifdef CONFIG_BT_HCIUART_LL 862 ll_deinit(); 863 #endif 864 #ifdef CONFIG_BT_HCIUART_ATH3K 865 ath_deinit(); 866 #endif 867 #ifdef CONFIG_BT_HCIUART_3WIRE 868 h5_deinit(); 869 #endif 870 #ifdef CONFIG_BT_HCIUART_INTEL 871 intel_deinit(); 872 #endif 873 #ifdef CONFIG_BT_HCIUART_BCM 874 bcm_deinit(); 875 #endif 876 #ifdef CONFIG_BT_HCIUART_QCA 877 qca_deinit(); 878 #endif 879 #ifdef CONFIG_BT_HCIUART_AG6XX 880 ag6xx_deinit(); 881 #endif 882 #ifdef CONFIG_BT_HCIUART_MRVL 883 mrvl_deinit(); 884 #endif 885 886 /* Release tty registration of line discipline */ 887 err = tty_unregister_ldisc(N_HCI); 888 if (err) 889 BT_ERR("Can't unregister HCI line discipline (%d)", err); 890 } 891 892 module_init(hci_uart_init); 893 module_exit(hci_uart_exit); 894 895 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 896 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 897 MODULE_VERSION(VERSION); 898 MODULE_LICENSE("GPL"); 899 MODULE_ALIAS_LDISC(N_HCI); 900