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 wake_up_bit(&hu->tx_state, HCI_UART_SENDING); 182 } 183 184 void hci_uart_init_work(struct work_struct *work) 185 { 186 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); 187 int err; 188 struct hci_dev *hdev; 189 190 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 191 return; 192 193 err = hci_register_dev(hu->hdev); 194 if (err < 0) { 195 BT_ERR("Can't register HCI device"); 196 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 197 hu->proto->close(hu); 198 hdev = hu->hdev; 199 hu->hdev = NULL; 200 hci_free_dev(hdev); 201 return; 202 } 203 204 set_bit(HCI_UART_REGISTERED, &hu->flags); 205 } 206 207 int hci_uart_init_ready(struct hci_uart *hu) 208 { 209 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 210 return -EALREADY; 211 212 schedule_work(&hu->init_ready); 213 214 return 0; 215 } 216 217 int hci_uart_wait_until_sent(struct hci_uart *hu) 218 { 219 return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING, 220 TASK_INTERRUPTIBLE, 221 msecs_to_jiffies(2000)); 222 } 223 224 /* ------- Interface to HCI layer ------ */ 225 /* Reset device */ 226 static int hci_uart_flush(struct hci_dev *hdev) 227 { 228 struct hci_uart *hu = hci_get_drvdata(hdev); 229 struct tty_struct *tty = hu->tty; 230 231 BT_DBG("hdev %p tty %p", hdev, tty); 232 233 if (hu->tx_skb) { 234 kfree_skb(hu->tx_skb); hu->tx_skb = NULL; 235 } 236 237 /* Flush any pending characters in the driver and discipline. */ 238 tty_ldisc_flush(tty); 239 tty_driver_flush_buffer(tty); 240 241 percpu_down_read(&hu->proto_lock); 242 243 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 244 hu->proto->flush(hu); 245 246 percpu_up_read(&hu->proto_lock); 247 248 return 0; 249 } 250 251 /* Initialize device */ 252 static int hci_uart_open(struct hci_dev *hdev) 253 { 254 BT_DBG("%s %p", hdev->name, hdev); 255 256 /* Undo clearing this from hci_uart_close() */ 257 hdev->flush = hci_uart_flush; 258 259 return 0; 260 } 261 262 /* Close device */ 263 static int hci_uart_close(struct hci_dev *hdev) 264 { 265 BT_DBG("hdev %p", hdev); 266 267 hci_uart_flush(hdev); 268 hdev->flush = NULL; 269 return 0; 270 } 271 272 /* Send frames from HCI layer */ 273 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 274 { 275 struct hci_uart *hu = hci_get_drvdata(hdev); 276 277 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), 278 skb->len); 279 280 percpu_down_read(&hu->proto_lock); 281 282 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 283 percpu_up_read(&hu->proto_lock); 284 return -EUNATCH; 285 } 286 287 hu->proto->enqueue(hu, skb); 288 percpu_up_read(&hu->proto_lock); 289 290 hci_uart_tx_wakeup(hu); 291 292 return 0; 293 } 294 295 /* Check the underlying device or tty has flow control support */ 296 bool hci_uart_has_flow_control(struct hci_uart *hu) 297 { 298 /* serdev nodes check if the needed operations are present */ 299 if (hu->serdev) 300 return true; 301 302 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset) 303 return true; 304 305 return false; 306 } 307 308 /* Flow control or un-flow control the device */ 309 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) 310 { 311 struct tty_struct *tty = hu->tty; 312 struct ktermios ktermios; 313 int status; 314 unsigned int set = 0; 315 unsigned int clear = 0; 316 317 if (hu->serdev) { 318 serdev_device_set_flow_control(hu->serdev, !enable); 319 serdev_device_set_rts(hu->serdev, !enable); 320 return; 321 } 322 323 if (enable) { 324 /* Disable hardware flow control */ 325 ktermios = tty->termios; 326 ktermios.c_cflag &= ~CRTSCTS; 327 status = tty_set_termios(tty, &ktermios); 328 BT_DBG("Disabling hardware flow control: %s", 329 status ? "failed" : "success"); 330 331 /* Clear RTS to prevent the device from sending */ 332 /* Most UARTs need OUT2 to enable interrupts */ 333 status = tty->driver->ops->tiocmget(tty); 334 BT_DBG("Current tiocm 0x%x", status); 335 336 set &= ~(TIOCM_OUT2 | TIOCM_RTS); 337 clear = ~set; 338 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 339 TIOCM_OUT2 | TIOCM_LOOP; 340 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 341 TIOCM_OUT2 | TIOCM_LOOP; 342 status = tty->driver->ops->tiocmset(tty, set, clear); 343 BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); 344 } else { 345 /* Set RTS to allow the device to send again */ 346 status = tty->driver->ops->tiocmget(tty); 347 BT_DBG("Current tiocm 0x%x", status); 348 349 set |= (TIOCM_OUT2 | TIOCM_RTS); 350 clear = ~set; 351 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 352 TIOCM_OUT2 | TIOCM_LOOP; 353 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 354 TIOCM_OUT2 | TIOCM_LOOP; 355 status = tty->driver->ops->tiocmset(tty, set, clear); 356 BT_DBG("Setting RTS: %s", status ? "failed" : "success"); 357 358 /* Re-enable hardware flow control */ 359 ktermios = tty->termios; 360 ktermios.c_cflag |= CRTSCTS; 361 status = tty_set_termios(tty, &ktermios); 362 BT_DBG("Enabling hardware flow control: %s", 363 status ? "failed" : "success"); 364 } 365 } 366 367 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, 368 unsigned int oper_speed) 369 { 370 hu->init_speed = init_speed; 371 hu->oper_speed = oper_speed; 372 } 373 374 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) 375 { 376 struct tty_struct *tty = hu->tty; 377 struct ktermios ktermios; 378 379 ktermios = tty->termios; 380 ktermios.c_cflag &= ~CBAUD; 381 tty_termios_encode_baud_rate(&ktermios, speed, speed); 382 383 /* tty_set_termios() return not checked as it is always 0 */ 384 tty_set_termios(tty, &ktermios); 385 386 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, 387 tty->termios.c_ispeed, tty->termios.c_ospeed); 388 } 389 390 static int hci_uart_setup(struct hci_dev *hdev) 391 { 392 struct hci_uart *hu = hci_get_drvdata(hdev); 393 struct hci_rp_read_local_version *ver; 394 struct sk_buff *skb; 395 unsigned int speed; 396 int err; 397 398 /* Init speed if any */ 399 if (hu->init_speed) 400 speed = hu->init_speed; 401 else if (hu->proto->init_speed) 402 speed = hu->proto->init_speed; 403 else 404 speed = 0; 405 406 if (speed) 407 hci_uart_set_baudrate(hu, speed); 408 409 /* Operational speed if any */ 410 if (hu->oper_speed) 411 speed = hu->oper_speed; 412 else if (hu->proto->oper_speed) 413 speed = hu->proto->oper_speed; 414 else 415 speed = 0; 416 417 if (hu->proto->set_baudrate && speed) { 418 err = hu->proto->set_baudrate(hu, speed); 419 if (!err) 420 hci_uart_set_baudrate(hu, speed); 421 } 422 423 if (hu->proto->setup) 424 return hu->proto->setup(hu); 425 426 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) 427 return 0; 428 429 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 430 HCI_INIT_TIMEOUT); 431 if (IS_ERR(skb)) { 432 BT_ERR("%s: Reading local version information failed (%ld)", 433 hdev->name, PTR_ERR(skb)); 434 return 0; 435 } 436 437 if (skb->len != sizeof(*ver)) { 438 BT_ERR("%s: Event length mismatch for version information", 439 hdev->name); 440 goto done; 441 } 442 443 ver = (struct hci_rp_read_local_version *)skb->data; 444 445 switch (le16_to_cpu(ver->manufacturer)) { 446 #ifdef CONFIG_BT_HCIUART_INTEL 447 case 2: 448 hdev->set_bdaddr = btintel_set_bdaddr; 449 btintel_check_bdaddr(hdev); 450 break; 451 #endif 452 #ifdef CONFIG_BT_HCIUART_BCM 453 case 15: 454 hdev->set_bdaddr = btbcm_set_bdaddr; 455 btbcm_check_bdaddr(hdev); 456 break; 457 #endif 458 default: 459 break; 460 } 461 462 done: 463 kfree_skb(skb); 464 return 0; 465 } 466 467 /* ------ LDISC part ------ */ 468 /* hci_uart_tty_open 469 * 470 * Called when line discipline changed to HCI_UART. 471 * 472 * Arguments: 473 * tty pointer to tty info structure 474 * Return Value: 475 * 0 if success, otherwise error code 476 */ 477 static int hci_uart_tty_open(struct tty_struct *tty) 478 { 479 struct hci_uart *hu; 480 481 BT_DBG("tty %p", tty); 482 483 /* Error if the tty has no write op instead of leaving an exploitable 484 * hole 485 */ 486 if (tty->ops->write == NULL) 487 return -EOPNOTSUPP; 488 489 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 490 if (!hu) { 491 BT_ERR("Can't allocate control structure"); 492 return -ENFILE; 493 } 494 495 tty->disc_data = hu; 496 hu->tty = tty; 497 tty->receive_room = 65536; 498 499 /* disable alignment support by default */ 500 hu->alignment = 1; 501 hu->padding = 0; 502 503 INIT_WORK(&hu->init_ready, hci_uart_init_work); 504 INIT_WORK(&hu->write_work, hci_uart_write_work); 505 506 percpu_init_rwsem(&hu->proto_lock); 507 508 /* Flush any pending characters in the driver */ 509 tty_driver_flush_buffer(tty); 510 511 return 0; 512 } 513 514 /* hci_uart_tty_close() 515 * 516 * Called when the line discipline is changed to something 517 * else, the tty is closed, or the tty detects a hangup. 518 */ 519 static void hci_uart_tty_close(struct tty_struct *tty) 520 { 521 struct hci_uart *hu = tty->disc_data; 522 struct hci_dev *hdev; 523 524 BT_DBG("tty %p", tty); 525 526 /* Detach from the tty */ 527 tty->disc_data = NULL; 528 529 if (!hu) 530 return; 531 532 hdev = hu->hdev; 533 if (hdev) 534 hci_uart_close(hdev); 535 536 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 537 percpu_down_write(&hu->proto_lock); 538 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 539 percpu_up_write(&hu->proto_lock); 540 541 cancel_work_sync(&hu->write_work); 542 543 if (hdev) { 544 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 545 hci_unregister_dev(hdev); 546 hci_free_dev(hdev); 547 } 548 hu->proto->close(hu); 549 } 550 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 551 552 percpu_free_rwsem(&hu->proto_lock); 553 554 kfree(hu); 555 } 556 557 /* hci_uart_tty_wakeup() 558 * 559 * Callback for transmit wakeup. Called when low level 560 * device driver can accept more send data. 561 * 562 * Arguments: tty pointer to associated tty instance data 563 * Return Value: None 564 */ 565 static void hci_uart_tty_wakeup(struct tty_struct *tty) 566 { 567 struct hci_uart *hu = tty->disc_data; 568 569 BT_DBG(""); 570 571 if (!hu) 572 return; 573 574 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 575 576 if (tty != hu->tty) 577 return; 578 579 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 580 hci_uart_tx_wakeup(hu); 581 } 582 583 /* hci_uart_tty_receive() 584 * 585 * Called by tty low level driver when receive data is 586 * available. 587 * 588 * Arguments: tty pointer to tty isntance data 589 * data pointer to received data 590 * flags pointer to flags for data 591 * count count of received data in bytes 592 * 593 * Return Value: None 594 */ 595 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 596 char *flags, int count) 597 { 598 struct hci_uart *hu = tty->disc_data; 599 600 if (!hu || tty != hu->tty) 601 return; 602 603 percpu_down_read(&hu->proto_lock); 604 605 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 606 percpu_up_read(&hu->proto_lock); 607 return; 608 } 609 610 /* It does not need a lock here as it is already protected by a mutex in 611 * tty caller 612 */ 613 hu->proto->recv(hu, data, count); 614 percpu_up_read(&hu->proto_lock); 615 616 if (hu->hdev) 617 hu->hdev->stat.byte_rx += count; 618 619 tty_unthrottle(tty); 620 } 621 622 static int hci_uart_register_dev(struct hci_uart *hu) 623 { 624 struct hci_dev *hdev; 625 int err; 626 627 BT_DBG(""); 628 629 /* Initialize and register HCI device */ 630 hdev = hci_alloc_dev(); 631 if (!hdev) { 632 BT_ERR("Can't allocate HCI device"); 633 return -ENOMEM; 634 } 635 636 hu->hdev = hdev; 637 638 hdev->bus = HCI_UART; 639 hci_set_drvdata(hdev, hu); 640 641 /* Only when vendor specific setup callback is provided, consider 642 * the manufacturer information valid. This avoids filling in the 643 * value for Ericsson when nothing is specified. 644 */ 645 if (hu->proto->setup) 646 hdev->manufacturer = hu->proto->manufacturer; 647 648 hdev->open = hci_uart_open; 649 hdev->close = hci_uart_close; 650 hdev->flush = hci_uart_flush; 651 hdev->send = hci_uart_send_frame; 652 hdev->setup = hci_uart_setup; 653 SET_HCIDEV_DEV(hdev, hu->tty->dev); 654 655 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 656 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 657 658 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 659 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 660 661 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 662 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 663 664 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) 665 hdev->dev_type = HCI_AMP; 666 else 667 hdev->dev_type = HCI_PRIMARY; 668 669 /* Only call open() for the protocol after hdev is fully initialized as 670 * open() (or a timer/workqueue it starts) may attempt to reference it. 671 */ 672 err = hu->proto->open(hu); 673 if (err) { 674 hu->hdev = NULL; 675 hci_free_dev(hdev); 676 return err; 677 } 678 679 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 680 return 0; 681 682 if (hci_register_dev(hdev) < 0) { 683 BT_ERR("Can't register HCI device"); 684 hu->proto->close(hu); 685 hu->hdev = NULL; 686 hci_free_dev(hdev); 687 return -ENODEV; 688 } 689 690 set_bit(HCI_UART_REGISTERED, &hu->flags); 691 692 return 0; 693 } 694 695 static int hci_uart_set_proto(struct hci_uart *hu, int id) 696 { 697 const struct hci_uart_proto *p; 698 int err; 699 700 p = hci_uart_get_proto(id); 701 if (!p) 702 return -EPROTONOSUPPORT; 703 704 hu->proto = p; 705 706 err = hci_uart_register_dev(hu); 707 if (err) { 708 return err; 709 } 710 711 set_bit(HCI_UART_PROTO_READY, &hu->flags); 712 return 0; 713 } 714 715 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 716 { 717 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 718 BIT(HCI_UART_RESET_ON_INIT) | 719 BIT(HCI_UART_CREATE_AMP) | 720 BIT(HCI_UART_INIT_PENDING) | 721 BIT(HCI_UART_EXT_CONFIG) | 722 BIT(HCI_UART_VND_DETECT); 723 724 if (flags & ~valid_flags) 725 return -EINVAL; 726 727 hu->hdev_flags = flags; 728 729 return 0; 730 } 731 732 /* hci_uart_tty_ioctl() 733 * 734 * Process IOCTL system call for the tty device. 735 * 736 * Arguments: 737 * 738 * tty pointer to tty instance data 739 * file pointer to open file object for device 740 * cmd IOCTL command code 741 * arg argument for IOCTL call (cmd dependent) 742 * 743 * Return Value: Command dependent 744 */ 745 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 746 unsigned int cmd, unsigned long arg) 747 { 748 struct hci_uart *hu = tty->disc_data; 749 int err = 0; 750 751 BT_DBG(""); 752 753 /* Verify the status of the device */ 754 if (!hu) 755 return -EBADF; 756 757 switch (cmd) { 758 case HCIUARTSETPROTO: 759 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 760 err = hci_uart_set_proto(hu, arg); 761 if (err) 762 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 763 } else 764 err = -EBUSY; 765 break; 766 767 case HCIUARTGETPROTO: 768 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 769 err = hu->proto->id; 770 else 771 err = -EUNATCH; 772 break; 773 774 case HCIUARTGETDEVICE: 775 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 776 err = hu->hdev->id; 777 else 778 err = -EUNATCH; 779 break; 780 781 case HCIUARTSETFLAGS: 782 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 783 err = -EBUSY; 784 else 785 err = hci_uart_set_flags(hu, arg); 786 break; 787 788 case HCIUARTGETFLAGS: 789 err = hu->hdev_flags; 790 break; 791 792 default: 793 err = n_tty_ioctl_helper(tty, file, cmd, arg); 794 break; 795 } 796 797 return err; 798 } 799 800 /* 801 * We don't provide read/write/poll interface for user space. 802 */ 803 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 804 unsigned char __user *buf, size_t nr) 805 { 806 return 0; 807 } 808 809 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 810 const unsigned char *data, size_t count) 811 { 812 return 0; 813 } 814 815 static __poll_t hci_uart_tty_poll(struct tty_struct *tty, 816 struct file *filp, poll_table *wait) 817 { 818 return 0; 819 } 820 821 static int __init hci_uart_init(void) 822 { 823 static struct tty_ldisc_ops hci_uart_ldisc; 824 int err; 825 826 BT_INFO("HCI UART driver ver %s", VERSION); 827 828 /* Register the tty discipline */ 829 830 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 831 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 832 hci_uart_ldisc.name = "n_hci"; 833 hci_uart_ldisc.open = hci_uart_tty_open; 834 hci_uart_ldisc.close = hci_uart_tty_close; 835 hci_uart_ldisc.read = hci_uart_tty_read; 836 hci_uart_ldisc.write = hci_uart_tty_write; 837 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 838 hci_uart_ldisc.compat_ioctl = hci_uart_tty_ioctl; 839 hci_uart_ldisc.poll = hci_uart_tty_poll; 840 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 841 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 842 hci_uart_ldisc.owner = THIS_MODULE; 843 844 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 845 if (err) { 846 BT_ERR("HCI line discipline registration failed. (%d)", err); 847 return err; 848 } 849 850 #ifdef CONFIG_BT_HCIUART_H4 851 h4_init(); 852 #endif 853 #ifdef CONFIG_BT_HCIUART_BCSP 854 bcsp_init(); 855 #endif 856 #ifdef CONFIG_BT_HCIUART_LL 857 ll_init(); 858 #endif 859 #ifdef CONFIG_BT_HCIUART_ATH3K 860 ath_init(); 861 #endif 862 #ifdef CONFIG_BT_HCIUART_3WIRE 863 h5_init(); 864 #endif 865 #ifdef CONFIG_BT_HCIUART_INTEL 866 intel_init(); 867 #endif 868 #ifdef CONFIG_BT_HCIUART_BCM 869 bcm_init(); 870 #endif 871 #ifdef CONFIG_BT_HCIUART_QCA 872 qca_init(); 873 #endif 874 #ifdef CONFIG_BT_HCIUART_AG6XX 875 ag6xx_init(); 876 #endif 877 #ifdef CONFIG_BT_HCIUART_MRVL 878 mrvl_init(); 879 #endif 880 881 return 0; 882 } 883 884 static void __exit hci_uart_exit(void) 885 { 886 int err; 887 888 #ifdef CONFIG_BT_HCIUART_H4 889 h4_deinit(); 890 #endif 891 #ifdef CONFIG_BT_HCIUART_BCSP 892 bcsp_deinit(); 893 #endif 894 #ifdef CONFIG_BT_HCIUART_LL 895 ll_deinit(); 896 #endif 897 #ifdef CONFIG_BT_HCIUART_ATH3K 898 ath_deinit(); 899 #endif 900 #ifdef CONFIG_BT_HCIUART_3WIRE 901 h5_deinit(); 902 #endif 903 #ifdef CONFIG_BT_HCIUART_INTEL 904 intel_deinit(); 905 #endif 906 #ifdef CONFIG_BT_HCIUART_BCM 907 bcm_deinit(); 908 #endif 909 #ifdef CONFIG_BT_HCIUART_QCA 910 qca_deinit(); 911 #endif 912 #ifdef CONFIG_BT_HCIUART_AG6XX 913 ag6xx_deinit(); 914 #endif 915 #ifdef CONFIG_BT_HCIUART_MRVL 916 mrvl_deinit(); 917 #endif 918 919 /* Release tty registration of line discipline */ 920 err = tty_unregister_ldisc(N_HCI); 921 if (err) 922 BT_ERR("Can't unregister HCI line discipline (%d)", err); 923 } 924 925 module_init(hci_uart_init); 926 module_exit(hci_uart_exit); 927 928 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 929 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 930 MODULE_VERSION(VERSION); 931 MODULE_LICENSE("GPL"); 932 MODULE_ALIAS_LDISC(N_HCI); 933