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 test_bit(HCI_UART_PROTO_INIT, &hu->flags)) 107 skb = hu->proto->dequeue(hu); 108 109 percpu_up_read(&hu->proto_lock); 110 } else { 111 hu->tx_skb = NULL; 112 } 113 114 return skb; 115 } 116 117 int hci_uart_tx_wakeup(struct hci_uart *hu) 118 { 119 /* This may be called in an IRQ context, so we can't sleep. Therefore 120 * we try to acquire the lock only, and if that fails we assume the 121 * tty is being closed because that is the only time the write lock is 122 * acquired. If, however, at some point in the future the write lock 123 * is also acquired in other situations, then this must be revisited. 124 */ 125 if (!percpu_down_read_trylock(&hu->proto_lock)) 126 return 0; 127 128 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && 129 !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) 130 goto no_schedule; 131 132 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 133 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) 134 goto no_schedule; 135 136 BT_DBG(""); 137 138 schedule_work(&hu->write_work); 139 140 no_schedule: 141 percpu_up_read(&hu->proto_lock); 142 143 return 0; 144 } 145 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); 146 147 static void hci_uart_write_work(struct work_struct *work) 148 { 149 struct hci_uart *hu = container_of(work, struct hci_uart, write_work); 150 struct tty_struct *tty = hu->tty; 151 struct hci_dev *hdev = hu->hdev; 152 struct sk_buff *skb; 153 154 /* REVISIT: should we cope with bad skbs or ->write() returning 155 * and error value ? 156 */ 157 158 restart: 159 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 160 161 while ((skb = hci_uart_dequeue(hu))) { 162 int len; 163 164 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 165 len = tty->ops->write(tty, skb->data, skb->len); 166 hdev->stat.byte_tx += len; 167 168 skb_pull(skb, len); 169 if (skb->len) { 170 hu->tx_skb = skb; 171 break; 172 } 173 174 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); 175 kfree_skb(skb); 176 } 177 178 clear_bit(HCI_UART_SENDING, &hu->tx_state); 179 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) 180 goto restart; 181 182 wake_up_bit(&hu->tx_state, HCI_UART_SENDING); 183 } 184 185 void hci_uart_init_work(struct work_struct *work) 186 { 187 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); 188 int err; 189 struct hci_dev *hdev; 190 191 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 192 return; 193 194 err = hci_register_dev(hu->hdev); 195 if (err < 0) { 196 BT_ERR("Can't register HCI device"); 197 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 198 hu->proto->close(hu); 199 hdev = hu->hdev; 200 hu->hdev = NULL; 201 hci_free_dev(hdev); 202 return; 203 } 204 205 set_bit(HCI_UART_REGISTERED, &hu->flags); 206 } 207 208 int hci_uart_init_ready(struct hci_uart *hu) 209 { 210 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 211 return -EALREADY; 212 213 schedule_work(&hu->init_ready); 214 215 return 0; 216 } 217 218 int hci_uart_wait_until_sent(struct hci_uart *hu) 219 { 220 return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING, 221 TASK_INTERRUPTIBLE, 222 msecs_to_jiffies(2000)); 223 } 224 225 /* ------- Interface to HCI layer ------ */ 226 /* Reset device */ 227 static int hci_uart_flush(struct hci_dev *hdev) 228 { 229 struct hci_uart *hu = hci_get_drvdata(hdev); 230 struct tty_struct *tty = hu->tty; 231 232 BT_DBG("hdev %p tty %p", hdev, tty); 233 234 if (hu->tx_skb) { 235 kfree_skb(hu->tx_skb); hu->tx_skb = NULL; 236 } 237 238 /* Flush any pending characters in the driver and discipline. */ 239 tty_ldisc_flush(tty); 240 tty_driver_flush_buffer(tty); 241 242 percpu_down_read(&hu->proto_lock); 243 244 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 245 hu->proto->flush(hu); 246 247 percpu_up_read(&hu->proto_lock); 248 249 return 0; 250 } 251 252 /* Initialize device */ 253 static int hci_uart_open(struct hci_dev *hdev) 254 { 255 BT_DBG("%s %p", hdev->name, hdev); 256 257 /* Undo clearing this from hci_uart_close() */ 258 hdev->flush = hci_uart_flush; 259 260 return 0; 261 } 262 263 /* Close device */ 264 static int hci_uart_close(struct hci_dev *hdev) 265 { 266 BT_DBG("hdev %p", hdev); 267 268 hci_uart_flush(hdev); 269 hdev->flush = NULL; 270 return 0; 271 } 272 273 /* Send frames from HCI layer */ 274 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 275 { 276 struct hci_uart *hu = hci_get_drvdata(hdev); 277 278 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), 279 skb->len); 280 281 percpu_down_read(&hu->proto_lock); 282 283 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && 284 !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) { 285 percpu_up_read(&hu->proto_lock); 286 return -EUNATCH; 287 } 288 289 hu->proto->enqueue(hu, skb); 290 percpu_up_read(&hu->proto_lock); 291 292 hci_uart_tx_wakeup(hu); 293 294 return 0; 295 } 296 297 /* Check the underlying device or tty has flow control support */ 298 bool hci_uart_has_flow_control(struct hci_uart *hu) 299 { 300 /* serdev nodes check if the needed operations are present */ 301 if (hu->serdev) 302 return true; 303 304 if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset) 305 return true; 306 307 return false; 308 } 309 310 /* Flow control or un-flow control the device */ 311 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) 312 { 313 struct tty_struct *tty = hu->tty; 314 struct ktermios ktermios; 315 int status; 316 unsigned int set = 0; 317 unsigned int clear = 0; 318 319 if (hu->serdev) { 320 serdev_device_set_flow_control(hu->serdev, !enable); 321 serdev_device_set_rts(hu->serdev, !enable); 322 return; 323 } 324 325 if (enable) { 326 /* Disable hardware flow control */ 327 ktermios = tty->termios; 328 ktermios.c_cflag &= ~CRTSCTS; 329 tty_set_termios(tty, &ktermios); 330 BT_DBG("Disabling hardware flow control: %s", 331 (tty->termios.c_cflag & CRTSCTS) ? "failed" : "success"); 332 333 /* Clear RTS to prevent the device from sending */ 334 /* Most UARTs need OUT2 to enable interrupts */ 335 status = tty->driver->ops->tiocmget(tty); 336 BT_DBG("Current tiocm 0x%x", status); 337 338 set &= ~(TIOCM_OUT2 | TIOCM_RTS); 339 clear = ~set; 340 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 341 TIOCM_OUT2 | TIOCM_LOOP; 342 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 343 TIOCM_OUT2 | TIOCM_LOOP; 344 status = tty->driver->ops->tiocmset(tty, set, clear); 345 BT_DBG("Clearing RTS: %s", status ? "failed" : "success"); 346 } else { 347 /* Set RTS to allow the device to send again */ 348 status = tty->driver->ops->tiocmget(tty); 349 BT_DBG("Current tiocm 0x%x", status); 350 351 set |= (TIOCM_OUT2 | TIOCM_RTS); 352 clear = ~set; 353 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 354 TIOCM_OUT2 | TIOCM_LOOP; 355 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 356 TIOCM_OUT2 | TIOCM_LOOP; 357 status = tty->driver->ops->tiocmset(tty, set, clear); 358 BT_DBG("Setting RTS: %s", status ? "failed" : "success"); 359 360 /* Re-enable hardware flow control */ 361 ktermios = tty->termios; 362 ktermios.c_cflag |= CRTSCTS; 363 tty_set_termios(tty, &ktermios); 364 BT_DBG("Enabling hardware flow control: %s", 365 !(tty->termios.c_cflag & CRTSCTS) ? "failed" : "success"); 366 } 367 } 368 369 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, 370 unsigned int oper_speed) 371 { 372 hu->init_speed = init_speed; 373 hu->oper_speed = oper_speed; 374 } 375 376 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) 377 { 378 struct tty_struct *tty = hu->tty; 379 struct ktermios ktermios; 380 381 ktermios = tty->termios; 382 ktermios.c_cflag &= ~CBAUD; 383 tty_termios_encode_baud_rate(&ktermios, speed, speed); 384 385 /* tty_set_termios() return not checked as it is always 0 */ 386 tty_set_termios(tty, &ktermios); 387 388 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, 389 tty->termios.c_ispeed, tty->termios.c_ospeed); 390 } 391 392 static int hci_uart_setup(struct hci_dev *hdev) 393 { 394 struct hci_uart *hu = hci_get_drvdata(hdev); 395 struct hci_rp_read_local_version *ver; 396 struct sk_buff *skb; 397 unsigned int speed; 398 int err; 399 400 /* Init speed if any */ 401 if (hu->init_speed) 402 speed = hu->init_speed; 403 else if (hu->proto->init_speed) 404 speed = hu->proto->init_speed; 405 else 406 speed = 0; 407 408 if (speed) 409 hci_uart_set_baudrate(hu, speed); 410 411 /* Operational speed if any */ 412 if (hu->oper_speed) 413 speed = hu->oper_speed; 414 else if (hu->proto->oper_speed) 415 speed = hu->proto->oper_speed; 416 else 417 speed = 0; 418 419 if (hu->proto->set_baudrate && speed) { 420 err = hu->proto->set_baudrate(hu, speed); 421 if (!err) 422 hci_uart_set_baudrate(hu, speed); 423 } 424 425 if (hu->proto->setup) 426 return hu->proto->setup(hu); 427 428 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) 429 return 0; 430 431 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 432 HCI_INIT_TIMEOUT); 433 if (IS_ERR(skb)) { 434 BT_ERR("%s: Reading local version information failed (%ld)", 435 hdev->name, PTR_ERR(skb)); 436 return 0; 437 } 438 439 if (skb->len != sizeof(*ver)) { 440 BT_ERR("%s: Event length mismatch for version information", 441 hdev->name); 442 goto done; 443 } 444 445 ver = (struct hci_rp_read_local_version *)skb->data; 446 447 switch (le16_to_cpu(ver->manufacturer)) { 448 #ifdef CONFIG_BT_HCIUART_INTEL 449 case 2: 450 hdev->set_bdaddr = btintel_set_bdaddr; 451 btintel_check_bdaddr(hdev); 452 break; 453 #endif 454 #ifdef CONFIG_BT_HCIUART_BCM 455 case 15: 456 hdev->set_bdaddr = btbcm_set_bdaddr; 457 btbcm_check_bdaddr(hdev); 458 break; 459 #endif 460 default: 461 break; 462 } 463 464 done: 465 kfree_skb(skb); 466 return 0; 467 } 468 469 /* ------ LDISC part ------ */ 470 /* hci_uart_tty_open 471 * 472 * Called when line discipline changed to HCI_UART. 473 * 474 * Arguments: 475 * tty pointer to tty info structure 476 * Return Value: 477 * 0 if success, otherwise error code 478 */ 479 static int hci_uart_tty_open(struct tty_struct *tty) 480 { 481 struct hci_uart *hu; 482 483 BT_DBG("tty %p", tty); 484 485 if (!capable(CAP_NET_ADMIN)) 486 return -EPERM; 487 488 /* Error if the tty has no write op instead of leaving an exploitable 489 * hole 490 */ 491 if (tty->ops->write == NULL) 492 return -EOPNOTSUPP; 493 494 hu = kzalloc(sizeof(*hu), GFP_KERNEL); 495 if (!hu) { 496 BT_ERR("Can't allocate control structure"); 497 return -ENFILE; 498 } 499 if (percpu_init_rwsem(&hu->proto_lock)) { 500 BT_ERR("Can't allocate semaphore structure"); 501 kfree(hu); 502 return -ENOMEM; 503 } 504 505 tty->disc_data = hu; 506 hu->tty = tty; 507 tty->receive_room = 65536; 508 509 /* disable alignment support by default */ 510 hu->alignment = 1; 511 hu->padding = 0; 512 513 /* Use serial port speed as oper_speed */ 514 hu->oper_speed = tty->termios.c_ospeed; 515 516 INIT_WORK(&hu->init_ready, hci_uart_init_work); 517 INIT_WORK(&hu->write_work, hci_uart_write_work); 518 519 /* Flush any pending characters in the driver */ 520 tty_driver_flush_buffer(tty); 521 522 return 0; 523 } 524 525 /* hci_uart_tty_close() 526 * 527 * Called when the line discipline is changed to something 528 * else, the tty is closed, or the tty detects a hangup. 529 */ 530 static void hci_uart_tty_close(struct tty_struct *tty) 531 { 532 struct hci_uart *hu = tty->disc_data; 533 struct hci_dev *hdev; 534 535 BT_DBG("tty %p", tty); 536 537 /* Detach from the tty */ 538 tty->disc_data = NULL; 539 540 if (!hu) 541 return; 542 543 hdev = hu->hdev; 544 if (hdev) 545 hci_uart_close(hdev); 546 547 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 548 percpu_down_write(&hu->proto_lock); 549 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 550 percpu_up_write(&hu->proto_lock); 551 552 cancel_work_sync(&hu->init_ready); 553 cancel_work_sync(&hu->write_work); 554 555 if (hdev) { 556 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 557 hci_unregister_dev(hdev); 558 hci_free_dev(hdev); 559 } 560 hu->proto->close(hu); 561 } 562 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 563 564 percpu_free_rwsem(&hu->proto_lock); 565 566 kfree(hu); 567 } 568 569 /* hci_uart_tty_wakeup() 570 * 571 * Callback for transmit wakeup. Called when low level 572 * device driver can accept more send data. 573 * 574 * Arguments: tty pointer to associated tty instance data 575 * Return Value: None 576 */ 577 static void hci_uart_tty_wakeup(struct tty_struct *tty) 578 { 579 struct hci_uart *hu = tty->disc_data; 580 581 BT_DBG(""); 582 583 if (!hu) 584 return; 585 586 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 587 588 if (tty != hu->tty) 589 return; 590 591 if (test_bit(HCI_UART_PROTO_READY, &hu->flags) || 592 test_bit(HCI_UART_PROTO_INIT, &hu->flags)) 593 hci_uart_tx_wakeup(hu); 594 } 595 596 /* hci_uart_tty_receive() 597 * 598 * Called by tty low level driver when receive data is 599 * available. 600 * 601 * Arguments: tty pointer to tty instance data 602 * data pointer to received data 603 * flags pointer to flags for data 604 * count count of received data in bytes 605 * 606 * Return Value: None 607 */ 608 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 609 const u8 *flags, size_t count) 610 { 611 struct hci_uart *hu = tty->disc_data; 612 613 if (!hu || tty != hu->tty) 614 return; 615 616 percpu_down_read(&hu->proto_lock); 617 618 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && 619 !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) { 620 percpu_up_read(&hu->proto_lock); 621 return; 622 } 623 624 /* It does not need a lock here as it is already protected by a mutex in 625 * tty caller 626 */ 627 hu->proto->recv(hu, data, count); 628 percpu_up_read(&hu->proto_lock); 629 630 if (hu->hdev) 631 hu->hdev->stat.byte_rx += count; 632 633 tty_unthrottle(tty); 634 } 635 636 static int hci_uart_register_dev(struct hci_uart *hu) 637 { 638 struct hci_dev *hdev; 639 int err; 640 641 BT_DBG(""); 642 643 /* Initialize and register HCI device */ 644 hdev = hci_alloc_dev(); 645 if (!hdev) { 646 BT_ERR("Can't allocate HCI device"); 647 return -ENOMEM; 648 } 649 650 hu->hdev = hdev; 651 652 hdev->bus = HCI_UART; 653 hci_set_drvdata(hdev, hu); 654 655 /* Only when vendor specific setup callback is provided, consider 656 * the manufacturer information valid. This avoids filling in the 657 * value for Ericsson when nothing is specified. 658 */ 659 if (hu->proto->setup) 660 hdev->manufacturer = hu->proto->manufacturer; 661 662 hdev->open = hci_uart_open; 663 hdev->close = hci_uart_close; 664 hdev->flush = hci_uart_flush; 665 hdev->send = hci_uart_send_frame; 666 hdev->setup = hci_uart_setup; 667 SET_HCIDEV_DEV(hdev, hu->tty->dev); 668 669 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 670 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 671 672 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 673 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 674 675 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 676 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 677 678 /* Only call open() for the protocol after hdev is fully initialized as 679 * open() (or a timer/workqueue it starts) may attempt to reference it. 680 */ 681 err = hu->proto->open(hu); 682 if (err) { 683 hu->hdev = NULL; 684 hci_free_dev(hdev); 685 return err; 686 } 687 688 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 689 return 0; 690 691 if (hci_register_dev(hdev) < 0) { 692 BT_ERR("Can't register HCI device"); 693 hu->proto->close(hu); 694 hu->hdev = NULL; 695 hci_free_dev(hdev); 696 return -ENODEV; 697 } 698 699 set_bit(HCI_UART_REGISTERED, &hu->flags); 700 701 return 0; 702 } 703 704 static int hci_uart_set_proto(struct hci_uart *hu, int id) 705 { 706 const struct hci_uart_proto *p; 707 int err; 708 709 p = hci_uart_get_proto(id); 710 if (!p) 711 return -EPROTONOSUPPORT; 712 713 hu->proto = p; 714 715 set_bit(HCI_UART_PROTO_INIT, &hu->flags); 716 717 err = hci_uart_register_dev(hu); 718 if (err) { 719 return err; 720 } 721 722 set_bit(HCI_UART_PROTO_READY, &hu->flags); 723 clear_bit(HCI_UART_PROTO_INIT, &hu->flags); 724 725 return 0; 726 } 727 728 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 729 { 730 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 731 BIT(HCI_UART_RESET_ON_INIT) | 732 BIT(HCI_UART_INIT_PENDING) | 733 BIT(HCI_UART_EXT_CONFIG) | 734 BIT(HCI_UART_VND_DETECT); 735 736 if (flags & ~valid_flags) 737 return -EINVAL; 738 739 hu->hdev_flags = flags; 740 741 return 0; 742 } 743 744 /* hci_uart_tty_ioctl() 745 * 746 * Process IOCTL system call for the tty device. 747 * 748 * Arguments: 749 * 750 * tty pointer to tty instance data 751 * cmd IOCTL command code 752 * arg argument for IOCTL call (cmd dependent) 753 * 754 * Return Value: Command dependent 755 */ 756 static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd, 757 unsigned long arg) 758 { 759 struct hci_uart *hu = tty->disc_data; 760 int err = 0; 761 762 BT_DBG(""); 763 764 /* Verify the status of the device */ 765 if (!hu) 766 return -EBADF; 767 768 switch (cmd) { 769 case HCIUARTSETPROTO: 770 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 771 err = hci_uart_set_proto(hu, arg); 772 if (err) 773 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 774 } else 775 err = -EBUSY; 776 break; 777 778 case HCIUARTGETPROTO: 779 if (test_bit(HCI_UART_PROTO_SET, &hu->flags) && 780 test_bit(HCI_UART_PROTO_READY, &hu->flags)) 781 err = hu->proto->id; 782 else 783 err = -EUNATCH; 784 break; 785 786 case HCIUARTGETDEVICE: 787 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 788 err = hu->hdev->id; 789 else 790 err = -EUNATCH; 791 break; 792 793 case HCIUARTSETFLAGS: 794 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 795 err = -EBUSY; 796 else 797 err = hci_uart_set_flags(hu, arg); 798 break; 799 800 case HCIUARTGETFLAGS: 801 err = hu->hdev_flags; 802 break; 803 804 default: 805 err = n_tty_ioctl_helper(tty, cmd, arg); 806 break; 807 } 808 809 return err; 810 } 811 812 /* 813 * We don't provide read/write/poll interface for user space. 814 */ 815 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 816 u8 *buf, size_t nr, void **cookie, 817 unsigned long offset) 818 { 819 return 0; 820 } 821 822 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 823 const u8 *data, size_t count) 824 { 825 return 0; 826 } 827 828 static struct tty_ldisc_ops hci_uart_ldisc = { 829 .owner = THIS_MODULE, 830 .num = N_HCI, 831 .name = "n_hci", 832 .open = hci_uart_tty_open, 833 .close = hci_uart_tty_close, 834 .read = hci_uart_tty_read, 835 .write = hci_uart_tty_write, 836 .ioctl = hci_uart_tty_ioctl, 837 .compat_ioctl = hci_uart_tty_ioctl, 838 .receive_buf = hci_uart_tty_receive, 839 .write_wakeup = hci_uart_tty_wakeup, 840 }; 841 842 static int __init hci_uart_init(void) 843 { 844 int err; 845 846 BT_INFO("HCI UART driver ver %s", VERSION); 847 848 /* Register the tty discipline */ 849 err = tty_register_ldisc(&hci_uart_ldisc); 850 if (err) { 851 BT_ERR("HCI line discipline registration failed. (%d)", err); 852 return err; 853 } 854 855 #ifdef CONFIG_BT_HCIUART_H4 856 h4_init(); 857 #endif 858 #ifdef CONFIG_BT_HCIUART_BCSP 859 bcsp_init(); 860 #endif 861 #ifdef CONFIG_BT_HCIUART_LL 862 ll_init(); 863 #endif 864 #ifdef CONFIG_BT_HCIUART_ATH3K 865 ath_init(); 866 #endif 867 #ifdef CONFIG_BT_HCIUART_3WIRE 868 h5_init(); 869 #endif 870 #ifdef CONFIG_BT_HCIUART_INTEL 871 intel_init(); 872 #endif 873 #ifdef CONFIG_BT_HCIUART_BCM 874 bcm_init(); 875 #endif 876 #ifdef CONFIG_BT_HCIUART_QCA 877 qca_init(); 878 #endif 879 #ifdef CONFIG_BT_HCIUART_AG6XX 880 ag6xx_init(); 881 #endif 882 #ifdef CONFIG_BT_HCIUART_MRVL 883 mrvl_init(); 884 #endif 885 #ifdef CONFIG_BT_HCIUART_AML 886 aml_init(); 887 #endif 888 return 0; 889 } 890 891 static void __exit hci_uart_exit(void) 892 { 893 #ifdef CONFIG_BT_HCIUART_H4 894 h4_deinit(); 895 #endif 896 #ifdef CONFIG_BT_HCIUART_BCSP 897 bcsp_deinit(); 898 #endif 899 #ifdef CONFIG_BT_HCIUART_LL 900 ll_deinit(); 901 #endif 902 #ifdef CONFIG_BT_HCIUART_ATH3K 903 ath_deinit(); 904 #endif 905 #ifdef CONFIG_BT_HCIUART_3WIRE 906 h5_deinit(); 907 #endif 908 #ifdef CONFIG_BT_HCIUART_INTEL 909 intel_deinit(); 910 #endif 911 #ifdef CONFIG_BT_HCIUART_BCM 912 bcm_deinit(); 913 #endif 914 #ifdef CONFIG_BT_HCIUART_QCA 915 qca_deinit(); 916 #endif 917 #ifdef CONFIG_BT_HCIUART_AG6XX 918 ag6xx_deinit(); 919 #endif 920 #ifdef CONFIG_BT_HCIUART_MRVL 921 mrvl_deinit(); 922 #endif 923 #ifdef CONFIG_BT_HCIUART_AML 924 aml_deinit(); 925 #endif 926 tty_unregister_ldisc(&hci_uart_ldisc); 927 } 928 929 module_init(hci_uart_init); 930 module_exit(hci_uart_exit); 931 932 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 933 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 934 MODULE_VERSION(VERSION); 935 MODULE_LICENSE("GPL"); 936 MODULE_ALIAS_LDISC(N_HCI); 937