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