1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Bluetooth HCI UART driver 5 * 6 * Copyright (C) 2000-2001 Qualcomm Incorporated 7 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> 8 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> 9 */ 10 11 #include <linux/module.h> 12 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/types.h> 16 #include <linux/fcntl.h> 17 #include <linux/interrupt.h> 18 #include <linux/ptrace.h> 19 #include <linux/poll.h> 20 21 #include <linux/slab.h> 22 #include <linux/tty.h> 23 #include <linux/errno.h> 24 #include <linux/string.h> 25 #include <linux/signal.h> 26 #include <linux/ioctl.h> 27 #include <linux/skbuff.h> 28 #include <linux/firmware.h> 29 #include <linux/serdev.h> 30 31 #include <net/bluetooth/bluetooth.h> 32 #include <net/bluetooth/hci_core.h> 33 34 #include "btintel.h" 35 #include "btbcm.h" 36 #include "hci_uart.h" 37 38 #define VERSION "2.3" 39 40 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; 41 42 int hci_uart_register_proto(const struct hci_uart_proto *p) 43 { 44 if (p->id >= HCI_UART_MAX_PROTO) 45 return -EINVAL; 46 47 if (hup[p->id]) 48 return -EEXIST; 49 50 hup[p->id] = p; 51 52 BT_INFO("HCI UART protocol %s registered", p->name); 53 54 return 0; 55 } 56 57 int hci_uart_unregister_proto(const struct hci_uart_proto *p) 58 { 59 if (p->id >= HCI_UART_MAX_PROTO) 60 return -EINVAL; 61 62 if (!hup[p->id]) 63 return -EINVAL; 64 65 hup[p->id] = NULL; 66 67 return 0; 68 } 69 70 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id) 71 { 72 if (id >= HCI_UART_MAX_PROTO) 73 return NULL; 74 75 return hup[id]; 76 } 77 78 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) 79 { 80 struct hci_dev *hdev = hu->hdev; 81 82 /* Update HCI stat counters */ 83 switch (pkt_type) { 84 case HCI_COMMAND_PKT: 85 hdev->stat.cmd_tx++; 86 break; 87 88 case HCI_ACLDATA_PKT: 89 hdev->stat.acl_tx++; 90 break; 91 92 case HCI_SCODATA_PKT: 93 hdev->stat.sco_tx++; 94 break; 95 } 96 } 97 98 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) 99 { 100 struct sk_buff *skb = hu->tx_skb; 101 102 if (!skb) { 103 percpu_down_read(&hu->proto_lock); 104 105 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 106 skb = hu->proto->dequeue(hu); 107 108 percpu_up_read(&hu->proto_lock); 109 } else { 110 hu->tx_skb = NULL; 111 } 112 113 return skb; 114 } 115 116 int hci_uart_tx_wakeup(struct hci_uart *hu) 117 { 118 /* This may be called in an IRQ context, so we can't sleep. Therefore 119 * we try to acquire the lock only, and if that fails we assume the 120 * tty is being closed because that is the only time the write lock is 121 * acquired. If, however, at some point in the future the write lock 122 * is also acquired in other situations, then this must be revisited. 123 */ 124 if (!percpu_down_read_trylock(&hu->proto_lock)) 125 return 0; 126 127 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) 128 goto no_schedule; 129 130 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { 131 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 132 goto no_schedule; 133 } 134 135 BT_DBG(""); 136 137 schedule_work(&hu->write_work); 138 139 no_schedule: 140 percpu_up_read(&hu->proto_lock); 141 142 return 0; 143 } 144 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); 145 146 static void hci_uart_write_work(struct work_struct *work) 147 { 148 struct hci_uart *hu = container_of(work, struct hci_uart, write_work); 149 struct tty_struct *tty = hu->tty; 150 struct hci_dev *hdev = hu->hdev; 151 struct sk_buff *skb; 152 153 /* REVISIT: should we cope with bad skbs or ->write() returning 154 * and error value ? 155 */ 156 157 restart: 158 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 159 160 while ((skb = hci_uart_dequeue(hu))) { 161 int len; 162 163 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 164 len = tty->ops->write(tty, skb->data, skb->len); 165 hdev->stat.byte_tx += len; 166 167 skb_pull(skb, len); 168 if (skb->len) { 169 hu->tx_skb = skb; 170 break; 171 } 172 173 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); 174 kfree_skb(skb); 175 } 176 177 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) 178 goto restart; 179 180 clear_bit(HCI_UART_SENDING, &hu->tx_state); 181 } 182 183 void hci_uart_init_work(struct work_struct *work) 184 { 185 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); 186 int err; 187 struct hci_dev *hdev; 188 189 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 190 return; 191 192 err = hci_register_dev(hu->hdev); 193 if (err < 0) { 194 BT_ERR("Can't register HCI device"); 195 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 196 hu->proto->close(hu); 197 hdev = hu->hdev; 198 hu->hdev = NULL; 199 hci_free_dev(hdev); 200 return; 201 } 202 203 set_bit(HCI_UART_REGISTERED, &hu->flags); 204 } 205 206 int hci_uart_init_ready(struct hci_uart *hu) 207 { 208 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 209 return -EALREADY; 210 211 schedule_work(&hu->init_ready); 212 213 return 0; 214 } 215 216 /* ------- Interface to HCI layer ------ */ 217 /* Reset device */ 218 static int hci_uart_flush(struct hci_dev *hdev) 219 { 220 struct hci_uart *hu = hci_get_drvdata(hdev); 221 struct tty_struct *tty = hu->tty; 222 223 BT_DBG("hdev %p tty %p", hdev, tty); 224 225 if (hu->tx_skb) { 226 kfree_skb(hu->tx_skb); hu->tx_skb = NULL; 227 } 228 229 /* Flush any pending characters in the driver and discipline. */ 230 tty_ldisc_flush(tty); 231 tty_driver_flush_buffer(tty); 232 233 percpu_down_read(&hu->proto_lock); 234 235 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 236 hu->proto->flush(hu); 237 238 percpu_up_read(&hu->proto_lock); 239 240 return 0; 241 } 242 243 /* Initialize device */ 244 static int hci_uart_open(struct hci_dev *hdev) 245 { 246 BT_DBG("%s %p", hdev->name, hdev); 247 248 /* Undo clearing this from hci_uart_close() */ 249 hdev->flush = hci_uart_flush; 250 251 return 0; 252 } 253 254 /* Close device */ 255 static int hci_uart_close(struct hci_dev *hdev) 256 { 257 BT_DBG("hdev %p", hdev); 258 259 hci_uart_flush(hdev); 260 hdev->flush = NULL; 261 return 0; 262 } 263 264 /* Send frames from HCI layer */ 265 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 266 { 267 struct hci_uart *hu = hci_get_drvdata(hdev); 268 269 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), 270 skb->len); 271 272 percpu_down_read(&hu->proto_lock); 273 274 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 275 percpu_up_read(&hu->proto_lock); 276 return -EUNATCH; 277 } 278 279 hu->proto->enqueue(hu, skb); 280 percpu_up_read(&hu->proto_lock); 281 282 hci_uart_tx_wakeup(hu); 283 284 return 0; 285 } 286 287 /* Flow control or un-flow control the device */ 288 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) 289 { 290 struct tty_struct *tty = hu->tty; 291 struct ktermios ktermios; 292 int status; 293 unsigned int set = 0; 294 unsigned int clear = 0; 295 296 if (hu->serdev) { 297 serdev_device_set_flow_control(hu->serdev, !enable); 298 serdev_device_set_rts(hu->serdev, !enable); 299 return; 300 } 301 302 if (enable) { 303 /* Disable hardware flow control */ 304 ktermios = tty->termios; 305 ktermios.c_cflag &= ~CRTSCTS; 306 status = tty_set_termios(tty, &ktermios); 307 BT_DBG("Disabling hardware flow control: %s", 308 status ? "failed" : "success"); 309 310 /* Clear RTS to prevent the device from sending */ 311 /* Most UARTs need OUT2 to enable interrupts */ 312 status = tty->driver->ops->tiocmget(tty); 313 BT_DBG("Current tiocm 0x%x", status); 314 315 set &= ~(TIOCM_OUT2 | TIOCM_RTS); 316 clear = ~set; 317 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 318 TIOCM_OUT2 | TIOCM_LOOP; 319 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 320 TIOCM_OUT2 | TIOCM_LOOP; 321 status = tty->driver->ops->tiocmset(tty, set, clear); 322 BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); 323 } else { 324 /* Set RTS to allow the device to send again */ 325 status = tty->driver->ops->tiocmget(tty); 326 BT_DBG("Current tiocm 0x%x", status); 327 328 set |= (TIOCM_OUT2 | TIOCM_RTS); 329 clear = ~set; 330 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 331 TIOCM_OUT2 | TIOCM_LOOP; 332 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 333 TIOCM_OUT2 | TIOCM_LOOP; 334 status = tty->driver->ops->tiocmset(tty, set, clear); 335 BT_DBG("Setting RTS: %s", status ? "failed" : "success"); 336 337 /* Re-enable hardware flow control */ 338 ktermios = tty->termios; 339 ktermios.c_cflag |= CRTSCTS; 340 status = tty_set_termios(tty, &ktermios); 341 BT_DBG("Enabling hardware flow control: %s", 342 status ? "failed" : "success"); 343 } 344 } 345 346 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, 347 unsigned int oper_speed) 348 { 349 hu->init_speed = init_speed; 350 hu->oper_speed = oper_speed; 351 } 352 353 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) 354 { 355 struct tty_struct *tty = hu->tty; 356 struct ktermios ktermios; 357 358 ktermios = tty->termios; 359 ktermios.c_cflag &= ~CBAUD; 360 tty_termios_encode_baud_rate(&ktermios, speed, speed); 361 362 /* tty_set_termios() return not checked as it is always 0 */ 363 tty_set_termios(tty, &ktermios); 364 365 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, 366 tty->termios.c_ispeed, tty->termios.c_ospeed); 367 } 368 369 static int hci_uart_setup(struct hci_dev *hdev) 370 { 371 struct hci_uart *hu = hci_get_drvdata(hdev); 372 struct hci_rp_read_local_version *ver; 373 struct sk_buff *skb; 374 unsigned int speed; 375 int err; 376 377 /* Init speed if any */ 378 if (hu->init_speed) 379 speed = hu->init_speed; 380 else if (hu->proto->init_speed) 381 speed = hu->proto->init_speed; 382 else 383 speed = 0; 384 385 if (speed) 386 hci_uart_set_baudrate(hu, speed); 387 388 /* Operational speed if any */ 389 if (hu->oper_speed) 390 speed = hu->oper_speed; 391 else if (hu->proto->oper_speed) 392 speed = hu->proto->oper_speed; 393 else 394 speed = 0; 395 396 if (hu->proto->set_baudrate && speed) { 397 err = hu->proto->set_baudrate(hu, speed); 398 if (!err) 399 hci_uart_set_baudrate(hu, speed); 400 } 401 402 if (hu->proto->setup) 403 return hu->proto->setup(hu); 404 405 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) 406 return 0; 407 408 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 409 HCI_INIT_TIMEOUT); 410 if (IS_ERR(skb)) { 411 BT_ERR("%s: Reading local version information failed (%ld)", 412 hdev->name, PTR_ERR(skb)); 413 return 0; 414 } 415 416 if (skb->len != sizeof(*ver)) { 417 BT_ERR("%s: Event length mismatch for version information", 418 hdev->name); 419 goto done; 420 } 421 422 ver = (struct hci_rp_read_local_version *)skb->data; 423 424 switch (le16_to_cpu(ver->manufacturer)) { 425 #ifdef CONFIG_BT_HCIUART_INTEL 426 case 2: 427 hdev->set_bdaddr = btintel_set_bdaddr; 428 btintel_check_bdaddr(hdev); 429 break; 430 #endif 431 #ifdef CONFIG_BT_HCIUART_BCM 432 case 15: 433 hdev->set_bdaddr = btbcm_set_bdaddr; 434 btbcm_check_bdaddr(hdev); 435 break; 436 #endif 437 default: 438 break; 439 } 440 441 done: 442 kfree_skb(skb); 443 return 0; 444 } 445 446 /* ------ LDISC part ------ */ 447 /* hci_uart_tty_open 448 * 449 * Called when line discipline changed to HCI_UART. 450 * 451 * Arguments: 452 * tty pointer to tty info structure 453 * Return Value: 454 * 0 if success, otherwise error code 455 */ 456 static int hci_uart_tty_open(struct tty_struct *tty) 457 { 458 struct hci_uart *hu; 459 460 BT_DBG("tty %p", tty); 461 462 /* Error if the tty has no write op instead of leaving an exploitable 463 * hole 464 */ 465 if (tty->ops->write == NULL) 466 return -EOPNOTSUPP; 467 468 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 469 if (!hu) { 470 BT_ERR("Can't allocate control structure"); 471 return -ENFILE; 472 } 473 474 tty->disc_data = hu; 475 hu->tty = tty; 476 tty->receive_room = 65536; 477 478 /* disable alignment support by default */ 479 hu->alignment = 1; 480 hu->padding = 0; 481 482 INIT_WORK(&hu->init_ready, hci_uart_init_work); 483 INIT_WORK(&hu->write_work, hci_uart_write_work); 484 485 percpu_init_rwsem(&hu->proto_lock); 486 487 /* Flush any pending characters in the driver */ 488 tty_driver_flush_buffer(tty); 489 490 return 0; 491 } 492 493 /* hci_uart_tty_close() 494 * 495 * Called when the line discipline is changed to something 496 * else, the tty is closed, or the tty detects a hangup. 497 */ 498 static void hci_uart_tty_close(struct tty_struct *tty) 499 { 500 struct hci_uart *hu = tty->disc_data; 501 struct hci_dev *hdev; 502 503 BT_DBG("tty %p", tty); 504 505 /* Detach from the tty */ 506 tty->disc_data = NULL; 507 508 if (!hu) 509 return; 510 511 hdev = hu->hdev; 512 if (hdev) 513 hci_uart_close(hdev); 514 515 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 516 percpu_down_write(&hu->proto_lock); 517 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 518 percpu_up_write(&hu->proto_lock); 519 520 cancel_work_sync(&hu->write_work); 521 522 if (hdev) { 523 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 524 hci_unregister_dev(hdev); 525 hci_free_dev(hdev); 526 } 527 hu->proto->close(hu); 528 } 529 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 530 531 percpu_free_rwsem(&hu->proto_lock); 532 533 kfree(hu); 534 } 535 536 /* hci_uart_tty_wakeup() 537 * 538 * Callback for transmit wakeup. Called when low level 539 * device driver can accept more send data. 540 * 541 * Arguments: tty pointer to associated tty instance data 542 * Return Value: None 543 */ 544 static void hci_uart_tty_wakeup(struct tty_struct *tty) 545 { 546 struct hci_uart *hu = tty->disc_data; 547 548 BT_DBG(""); 549 550 if (!hu) 551 return; 552 553 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 554 555 if (tty != hu->tty) 556 return; 557 558 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 559 hci_uart_tx_wakeup(hu); 560 } 561 562 /* hci_uart_tty_receive() 563 * 564 * Called by tty low level driver when receive data is 565 * available. 566 * 567 * Arguments: tty pointer to tty isntance data 568 * data pointer to received data 569 * flags pointer to flags for data 570 * count count of received data in bytes 571 * 572 * Return Value: None 573 */ 574 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 575 char *flags, int count) 576 { 577 struct hci_uart *hu = tty->disc_data; 578 579 if (!hu || tty != hu->tty) 580 return; 581 582 percpu_down_read(&hu->proto_lock); 583 584 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 585 percpu_up_read(&hu->proto_lock); 586 return; 587 } 588 589 /* It does not need a lock here as it is already protected by a mutex in 590 * tty caller 591 */ 592 hu->proto->recv(hu, data, count); 593 percpu_up_read(&hu->proto_lock); 594 595 if (hu->hdev) 596 hu->hdev->stat.byte_rx += count; 597 598 tty_unthrottle(tty); 599 } 600 601 static int hci_uart_register_dev(struct hci_uart *hu) 602 { 603 struct hci_dev *hdev; 604 int err; 605 606 BT_DBG(""); 607 608 /* Initialize and register HCI device */ 609 hdev = hci_alloc_dev(); 610 if (!hdev) { 611 BT_ERR("Can't allocate HCI device"); 612 return -ENOMEM; 613 } 614 615 hu->hdev = hdev; 616 617 hdev->bus = HCI_UART; 618 hci_set_drvdata(hdev, hu); 619 620 /* Only when vendor specific setup callback is provided, consider 621 * the manufacturer information valid. This avoids filling in the 622 * value for Ericsson when nothing is specified. 623 */ 624 if (hu->proto->setup) 625 hdev->manufacturer = hu->proto->manufacturer; 626 627 hdev->open = hci_uart_open; 628 hdev->close = hci_uart_close; 629 hdev->flush = hci_uart_flush; 630 hdev->send = hci_uart_send_frame; 631 hdev->setup = hci_uart_setup; 632 SET_HCIDEV_DEV(hdev, hu->tty->dev); 633 634 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 635 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 636 637 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 638 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 639 640 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 641 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 642 643 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) 644 hdev->dev_type = HCI_AMP; 645 else 646 hdev->dev_type = HCI_PRIMARY; 647 648 /* Only call open() for the protocol after hdev is fully initialized as 649 * open() (or a timer/workqueue it starts) may attempt to reference it. 650 */ 651 err = hu->proto->open(hu); 652 if (err) { 653 hu->hdev = NULL; 654 hci_free_dev(hdev); 655 return err; 656 } 657 658 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 659 return 0; 660 661 if (hci_register_dev(hdev) < 0) { 662 BT_ERR("Can't register HCI device"); 663 hu->proto->close(hu); 664 hu->hdev = NULL; 665 hci_free_dev(hdev); 666 return -ENODEV; 667 } 668 669 set_bit(HCI_UART_REGISTERED, &hu->flags); 670 671 return 0; 672 } 673 674 static int hci_uart_set_proto(struct hci_uart *hu, int id) 675 { 676 const struct hci_uart_proto *p; 677 int err; 678 679 p = hci_uart_get_proto(id); 680 if (!p) 681 return -EPROTONOSUPPORT; 682 683 hu->proto = p; 684 685 err = hci_uart_register_dev(hu); 686 if (err) { 687 return err; 688 } 689 690 set_bit(HCI_UART_PROTO_READY, &hu->flags); 691 return 0; 692 } 693 694 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 695 { 696 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 697 BIT(HCI_UART_RESET_ON_INIT) | 698 BIT(HCI_UART_CREATE_AMP) | 699 BIT(HCI_UART_INIT_PENDING) | 700 BIT(HCI_UART_EXT_CONFIG) | 701 BIT(HCI_UART_VND_DETECT); 702 703 if (flags & ~valid_flags) 704 return -EINVAL; 705 706 hu->hdev_flags = flags; 707 708 return 0; 709 } 710 711 /* hci_uart_tty_ioctl() 712 * 713 * Process IOCTL system call for the tty device. 714 * 715 * Arguments: 716 * 717 * tty pointer to tty instance data 718 * file pointer to open file object for device 719 * cmd IOCTL command code 720 * arg argument for IOCTL call (cmd dependent) 721 * 722 * Return Value: Command dependent 723 */ 724 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 725 unsigned int cmd, unsigned long arg) 726 { 727 struct hci_uart *hu = tty->disc_data; 728 int err = 0; 729 730 BT_DBG(""); 731 732 /* Verify the status of the device */ 733 if (!hu) 734 return -EBADF; 735 736 switch (cmd) { 737 case HCIUARTSETPROTO: 738 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 739 err = hci_uart_set_proto(hu, arg); 740 if (err) 741 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 742 } else 743 err = -EBUSY; 744 break; 745 746 case HCIUARTGETPROTO: 747 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 748 err = hu->proto->id; 749 else 750 err = -EUNATCH; 751 break; 752 753 case HCIUARTGETDEVICE: 754 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 755 err = hu->hdev->id; 756 else 757 err = -EUNATCH; 758 break; 759 760 case HCIUARTSETFLAGS: 761 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 762 err = -EBUSY; 763 else 764 err = hci_uart_set_flags(hu, arg); 765 break; 766 767 case HCIUARTGETFLAGS: 768 err = hu->hdev_flags; 769 break; 770 771 default: 772 err = n_tty_ioctl_helper(tty, file, cmd, arg); 773 break; 774 } 775 776 return err; 777 } 778 779 /* 780 * We don't provide read/write/poll interface for user space. 781 */ 782 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 783 unsigned char __user *buf, size_t nr) 784 { 785 return 0; 786 } 787 788 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 789 const unsigned char *data, size_t count) 790 { 791 return 0; 792 } 793 794 static __poll_t hci_uart_tty_poll(struct tty_struct *tty, 795 struct file *filp, poll_table *wait) 796 { 797 return 0; 798 } 799 800 static int __init hci_uart_init(void) 801 { 802 static struct tty_ldisc_ops hci_uart_ldisc; 803 int err; 804 805 BT_INFO("HCI UART driver ver %s", VERSION); 806 807 /* Register the tty discipline */ 808 809 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 810 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 811 hci_uart_ldisc.name = "n_hci"; 812 hci_uart_ldisc.open = hci_uart_tty_open; 813 hci_uart_ldisc.close = hci_uart_tty_close; 814 hci_uart_ldisc.read = hci_uart_tty_read; 815 hci_uart_ldisc.write = hci_uart_tty_write; 816 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 817 hci_uart_ldisc.compat_ioctl = hci_uart_tty_ioctl; 818 hci_uart_ldisc.poll = hci_uart_tty_poll; 819 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 820 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 821 hci_uart_ldisc.owner = THIS_MODULE; 822 823 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 824 if (err) { 825 BT_ERR("HCI line discipline registration failed. (%d)", err); 826 return err; 827 } 828 829 #ifdef CONFIG_BT_HCIUART_H4 830 h4_init(); 831 #endif 832 #ifdef CONFIG_BT_HCIUART_BCSP 833 bcsp_init(); 834 #endif 835 #ifdef CONFIG_BT_HCIUART_LL 836 ll_init(); 837 #endif 838 #ifdef CONFIG_BT_HCIUART_ATH3K 839 ath_init(); 840 #endif 841 #ifdef CONFIG_BT_HCIUART_3WIRE 842 h5_init(); 843 #endif 844 #ifdef CONFIG_BT_HCIUART_INTEL 845 intel_init(); 846 #endif 847 #ifdef CONFIG_BT_HCIUART_BCM 848 bcm_init(); 849 #endif 850 #ifdef CONFIG_BT_HCIUART_QCA 851 qca_init(); 852 #endif 853 #ifdef CONFIG_BT_HCIUART_AG6XX 854 ag6xx_init(); 855 #endif 856 #ifdef CONFIG_BT_HCIUART_MRVL 857 mrvl_init(); 858 #endif 859 860 return 0; 861 } 862 863 static void __exit hci_uart_exit(void) 864 { 865 int err; 866 867 #ifdef CONFIG_BT_HCIUART_H4 868 h4_deinit(); 869 #endif 870 #ifdef CONFIG_BT_HCIUART_BCSP 871 bcsp_deinit(); 872 #endif 873 #ifdef CONFIG_BT_HCIUART_LL 874 ll_deinit(); 875 #endif 876 #ifdef CONFIG_BT_HCIUART_ATH3K 877 ath_deinit(); 878 #endif 879 #ifdef CONFIG_BT_HCIUART_3WIRE 880 h5_deinit(); 881 #endif 882 #ifdef CONFIG_BT_HCIUART_INTEL 883 intel_deinit(); 884 #endif 885 #ifdef CONFIG_BT_HCIUART_BCM 886 bcm_deinit(); 887 #endif 888 #ifdef CONFIG_BT_HCIUART_QCA 889 qca_deinit(); 890 #endif 891 #ifdef CONFIG_BT_HCIUART_AG6XX 892 ag6xx_deinit(); 893 #endif 894 #ifdef CONFIG_BT_HCIUART_MRVL 895 mrvl_deinit(); 896 #endif 897 898 /* Release tty registration of line discipline */ 899 err = tty_unregister_ldisc(N_HCI); 900 if (err) 901 BT_ERR("Can't unregister HCI line discipline (%d)", err); 902 } 903 904 module_init(hci_uart_init); 905 module_exit(hci_uart_exit); 906 907 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 908 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 909 MODULE_VERSION(VERSION); 910 MODULE_LICENSE("GPL"); 911 MODULE_ALIAS_LDISC(N_HCI); 912