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 #include <linux/serdev.h> 45 46 #include <net/bluetooth/bluetooth.h> 47 #include <net/bluetooth/hci_core.h> 48 49 #include "btintel.h" 50 #include "btbcm.h" 51 #include "hci_uart.h" 52 53 #define VERSION "2.3" 54 55 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO]; 56 57 int hci_uart_register_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 -EEXIST; 64 65 hup[p->id] = p; 66 67 BT_INFO("HCI UART protocol %s registered", p->name); 68 69 return 0; 70 } 71 72 int hci_uart_unregister_proto(const struct hci_uart_proto *p) 73 { 74 if (p->id >= HCI_UART_MAX_PROTO) 75 return -EINVAL; 76 77 if (!hup[p->id]) 78 return -EINVAL; 79 80 hup[p->id] = NULL; 81 82 return 0; 83 } 84 85 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id) 86 { 87 if (id >= HCI_UART_MAX_PROTO) 88 return NULL; 89 90 return hup[id]; 91 } 92 93 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type) 94 { 95 struct hci_dev *hdev = hu->hdev; 96 97 /* Update HCI stat counters */ 98 switch (pkt_type) { 99 case HCI_COMMAND_PKT: 100 hdev->stat.cmd_tx++; 101 break; 102 103 case HCI_ACLDATA_PKT: 104 hdev->stat.acl_tx++; 105 break; 106 107 case HCI_SCODATA_PKT: 108 hdev->stat.sco_tx++; 109 break; 110 } 111 } 112 113 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu) 114 { 115 struct sk_buff *skb = hu->tx_skb; 116 117 if (!skb) { 118 percpu_down_read(&hu->proto_lock); 119 120 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 121 skb = hu->proto->dequeue(hu); 122 123 percpu_up_read(&hu->proto_lock); 124 } else { 125 hu->tx_skb = NULL; 126 } 127 128 return skb; 129 } 130 131 int hci_uart_tx_wakeup(struct hci_uart *hu) 132 { 133 /* This may be called in an IRQ context, so we can't sleep. Therefore 134 * we try to acquire the lock only, and if that fails we assume the 135 * tty is being closed because that is the only time the write lock is 136 * acquired. If, however, at some point in the future the write lock 137 * is also acquired in other situations, then this must be revisited. 138 */ 139 if (!percpu_down_read_trylock(&hu->proto_lock)) 140 return 0; 141 142 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) 143 goto no_schedule; 144 145 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) { 146 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 147 goto no_schedule; 148 } 149 150 BT_DBG(""); 151 152 schedule_work(&hu->write_work); 153 154 no_schedule: 155 percpu_up_read(&hu->proto_lock); 156 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup); 160 161 static void hci_uart_write_work(struct work_struct *work) 162 { 163 struct hci_uart *hu = container_of(work, struct hci_uart, write_work); 164 struct tty_struct *tty = hu->tty; 165 struct hci_dev *hdev = hu->hdev; 166 struct sk_buff *skb; 167 168 /* REVISIT: should we cope with bad skbs or ->write() returning 169 * and error value ? 170 */ 171 172 restart: 173 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); 174 175 while ((skb = hci_uart_dequeue(hu))) { 176 int len; 177 178 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 179 len = tty->ops->write(tty, skb->data, skb->len); 180 hdev->stat.byte_tx += len; 181 182 skb_pull(skb, len); 183 if (skb->len) { 184 hu->tx_skb = skb; 185 break; 186 } 187 188 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb)); 189 kfree_skb(skb); 190 } 191 192 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state)) 193 goto restart; 194 195 clear_bit(HCI_UART_SENDING, &hu->tx_state); 196 } 197 198 static void hci_uart_init_work(struct work_struct *work) 199 { 200 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready); 201 int err; 202 struct hci_dev *hdev; 203 204 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 205 return; 206 207 err = hci_register_dev(hu->hdev); 208 if (err < 0) { 209 BT_ERR("Can't register HCI device"); 210 hdev = hu->hdev; 211 hu->hdev = NULL; 212 hci_free_dev(hdev); 213 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 214 hu->proto->close(hu); 215 return; 216 } 217 218 set_bit(HCI_UART_REGISTERED, &hu->flags); 219 } 220 221 int hci_uart_init_ready(struct hci_uart *hu) 222 { 223 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 224 return -EALREADY; 225 226 schedule_work(&hu->init_ready); 227 228 return 0; 229 } 230 231 /* ------- Interface to HCI layer ------ */ 232 /* Initialize device */ 233 static int hci_uart_open(struct hci_dev *hdev) 234 { 235 BT_DBG("%s %p", hdev->name, hdev); 236 237 /* Nothing to do for UART driver */ 238 return 0; 239 } 240 241 /* Reset device */ 242 static int hci_uart_flush(struct hci_dev *hdev) 243 { 244 struct hci_uart *hu = hci_get_drvdata(hdev); 245 struct tty_struct *tty = hu->tty; 246 247 BT_DBG("hdev %p tty %p", hdev, tty); 248 249 if (hu->tx_skb) { 250 kfree_skb(hu->tx_skb); hu->tx_skb = NULL; 251 } 252 253 /* Flush any pending characters in the driver and discipline. */ 254 tty_ldisc_flush(tty); 255 tty_driver_flush_buffer(tty); 256 257 percpu_down_read(&hu->proto_lock); 258 259 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 260 hu->proto->flush(hu); 261 262 percpu_up_read(&hu->proto_lock); 263 264 return 0; 265 } 266 267 /* Close device */ 268 static int hci_uart_close(struct hci_dev *hdev) 269 { 270 BT_DBG("hdev %p", hdev); 271 272 hci_uart_flush(hdev); 273 hdev->flush = NULL; 274 return 0; 275 } 276 277 /* Send frames from HCI layer */ 278 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) 279 { 280 struct hci_uart *hu = hci_get_drvdata(hdev); 281 282 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), 283 skb->len); 284 285 percpu_down_read(&hu->proto_lock); 286 287 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 288 percpu_up_read(&hu->proto_lock); 289 return -EUNATCH; 290 } 291 292 hu->proto->enqueue(hu, skb); 293 percpu_up_read(&hu->proto_lock); 294 295 hci_uart_tx_wakeup(hu); 296 297 return 0; 298 } 299 300 /* Flow control or un-flow control the device */ 301 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable) 302 { 303 struct tty_struct *tty = hu->tty; 304 struct ktermios ktermios; 305 int status; 306 unsigned int set = 0; 307 unsigned int clear = 0; 308 309 if (hu->serdev) { 310 serdev_device_set_flow_control(hu->serdev, !enable); 311 serdev_device_set_rts(hu->serdev, !enable); 312 return; 313 } 314 315 if (enable) { 316 /* Disable hardware flow control */ 317 ktermios = tty->termios; 318 ktermios.c_cflag &= ~CRTSCTS; 319 status = tty_set_termios(tty, &ktermios); 320 BT_DBG("Disabling hardware flow control: %s", 321 status ? "failed" : "success"); 322 323 /* Clear RTS to prevent the device from sending */ 324 /* Most UARTs need OUT2 to enable interrupts */ 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("Clearing RTS: %s", status ? "failed" : "success"); 336 } else { 337 /* Set RTS to allow the device to send again */ 338 status = tty->driver->ops->tiocmget(tty); 339 BT_DBG("Current tiocm 0x%x", status); 340 341 set |= (TIOCM_OUT2 | TIOCM_RTS); 342 clear = ~set; 343 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 344 TIOCM_OUT2 | TIOCM_LOOP; 345 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | 346 TIOCM_OUT2 | TIOCM_LOOP; 347 status = tty->driver->ops->tiocmset(tty, set, clear); 348 BT_DBG("Setting RTS: %s", status ? "failed" : "success"); 349 350 /* Re-enable hardware flow control */ 351 ktermios = tty->termios; 352 ktermios.c_cflag |= CRTSCTS; 353 status = tty_set_termios(tty, &ktermios); 354 BT_DBG("Enabling hardware flow control: %s", 355 status ? "failed" : "success"); 356 } 357 } 358 359 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed, 360 unsigned int oper_speed) 361 { 362 hu->init_speed = init_speed; 363 hu->oper_speed = oper_speed; 364 } 365 366 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed) 367 { 368 struct tty_struct *tty = hu->tty; 369 struct ktermios ktermios; 370 371 ktermios = tty->termios; 372 ktermios.c_cflag &= ~CBAUD; 373 tty_termios_encode_baud_rate(&ktermios, speed, speed); 374 375 /* tty_set_termios() return not checked as it is always 0 */ 376 tty_set_termios(tty, &ktermios); 377 378 BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name, 379 tty->termios.c_ispeed, tty->termios.c_ospeed); 380 } 381 382 static int hci_uart_setup(struct hci_dev *hdev) 383 { 384 struct hci_uart *hu = hci_get_drvdata(hdev); 385 struct hci_rp_read_local_version *ver; 386 struct sk_buff *skb; 387 unsigned int speed; 388 int err; 389 390 /* Init speed if any */ 391 if (hu->init_speed) 392 speed = hu->init_speed; 393 else if (hu->proto->init_speed) 394 speed = hu->proto->init_speed; 395 else 396 speed = 0; 397 398 if (speed) 399 hci_uart_set_baudrate(hu, speed); 400 401 /* Operational speed if any */ 402 if (hu->oper_speed) 403 speed = hu->oper_speed; 404 else if (hu->proto->oper_speed) 405 speed = hu->proto->oper_speed; 406 else 407 speed = 0; 408 409 if (hu->proto->set_baudrate && speed) { 410 err = hu->proto->set_baudrate(hu, speed); 411 if (!err) 412 hci_uart_set_baudrate(hu, speed); 413 } 414 415 if (hu->proto->setup) 416 return hu->proto->setup(hu); 417 418 if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags)) 419 return 0; 420 421 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 422 HCI_INIT_TIMEOUT); 423 if (IS_ERR(skb)) { 424 BT_ERR("%s: Reading local version information failed (%ld)", 425 hdev->name, PTR_ERR(skb)); 426 return 0; 427 } 428 429 if (skb->len != sizeof(*ver)) { 430 BT_ERR("%s: Event length mismatch for version information", 431 hdev->name); 432 goto done; 433 } 434 435 ver = (struct hci_rp_read_local_version *)skb->data; 436 437 switch (le16_to_cpu(ver->manufacturer)) { 438 #ifdef CONFIG_BT_HCIUART_INTEL 439 case 2: 440 hdev->set_bdaddr = btintel_set_bdaddr; 441 btintel_check_bdaddr(hdev); 442 break; 443 #endif 444 #ifdef CONFIG_BT_HCIUART_BCM 445 case 15: 446 hdev->set_bdaddr = btbcm_set_bdaddr; 447 btbcm_check_bdaddr(hdev); 448 break; 449 #endif 450 } 451 452 done: 453 kfree_skb(skb); 454 return 0; 455 } 456 457 /* ------ LDISC part ------ */ 458 /* hci_uart_tty_open 459 * 460 * Called when line discipline changed to HCI_UART. 461 * 462 * Arguments: 463 * tty pointer to tty info structure 464 * Return Value: 465 * 0 if success, otherwise error code 466 */ 467 static int hci_uart_tty_open(struct tty_struct *tty) 468 { 469 struct hci_uart *hu; 470 471 BT_DBG("tty %p", tty); 472 473 /* Error if the tty has no write op instead of leaving an exploitable 474 * hole 475 */ 476 if (tty->ops->write == NULL) 477 return -EOPNOTSUPP; 478 479 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 480 if (!hu) { 481 BT_ERR("Can't allocate control structure"); 482 return -ENFILE; 483 } 484 485 tty->disc_data = hu; 486 hu->tty = tty; 487 tty->receive_room = 65536; 488 489 /* disable alignment support by default */ 490 hu->alignment = 1; 491 hu->padding = 0; 492 493 INIT_WORK(&hu->init_ready, hci_uart_init_work); 494 INIT_WORK(&hu->write_work, hci_uart_write_work); 495 496 percpu_init_rwsem(&hu->proto_lock); 497 498 /* Flush any pending characters in the driver */ 499 tty_driver_flush_buffer(tty); 500 501 return 0; 502 } 503 504 /* hci_uart_tty_close() 505 * 506 * Called when the line discipline is changed to something 507 * else, the tty is closed, or the tty detects a hangup. 508 */ 509 static void hci_uart_tty_close(struct tty_struct *tty) 510 { 511 struct hci_uart *hu = tty->disc_data; 512 struct hci_dev *hdev; 513 514 BT_DBG("tty %p", tty); 515 516 /* Detach from the tty */ 517 tty->disc_data = NULL; 518 519 if (!hu) 520 return; 521 522 hdev = hu->hdev; 523 if (hdev) 524 hci_uart_close(hdev); 525 526 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 527 percpu_down_write(&hu->proto_lock); 528 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 529 percpu_up_write(&hu->proto_lock); 530 531 cancel_work_sync(&hu->write_work); 532 533 if (hdev) { 534 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 535 hci_unregister_dev(hdev); 536 hci_free_dev(hdev); 537 } 538 hu->proto->close(hu); 539 } 540 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 541 542 kfree(hu); 543 } 544 545 /* hci_uart_tty_wakeup() 546 * 547 * Callback for transmit wakeup. Called when low level 548 * device driver can accept more send data. 549 * 550 * Arguments: tty pointer to associated tty instance data 551 * Return Value: None 552 */ 553 static void hci_uart_tty_wakeup(struct tty_struct *tty) 554 { 555 struct hci_uart *hu = tty->disc_data; 556 557 BT_DBG(""); 558 559 if (!hu) 560 return; 561 562 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 563 564 if (tty != hu->tty) 565 return; 566 567 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 568 hci_uart_tx_wakeup(hu); 569 } 570 571 /* hci_uart_tty_receive() 572 * 573 * Called by tty low level driver when receive data is 574 * available. 575 * 576 * Arguments: tty pointer to tty isntance data 577 * data pointer to received data 578 * flags pointer to flags for data 579 * count count of received data in bytes 580 * 581 * Return Value: None 582 */ 583 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 584 char *flags, int count) 585 { 586 struct hci_uart *hu = tty->disc_data; 587 588 if (!hu || tty != hu->tty) 589 return; 590 591 percpu_down_read(&hu->proto_lock); 592 593 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 594 percpu_up_read(&hu->proto_lock); 595 return; 596 } 597 598 /* It does not need a lock here as it is already protected by a mutex in 599 * tty caller 600 */ 601 hu->proto->recv(hu, data, count); 602 percpu_up_read(&hu->proto_lock); 603 604 if (hu->hdev) 605 hu->hdev->stat.byte_rx += count; 606 607 tty_unthrottle(tty); 608 } 609 610 static int hci_uart_register_dev(struct hci_uart *hu) 611 { 612 struct hci_dev *hdev; 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 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags)) 657 return 0; 658 659 if (hci_register_dev(hdev) < 0) { 660 BT_ERR("Can't register HCI device"); 661 hu->hdev = NULL; 662 hci_free_dev(hdev); 663 return -ENODEV; 664 } 665 666 set_bit(HCI_UART_REGISTERED, &hu->flags); 667 668 return 0; 669 } 670 671 static int hci_uart_set_proto(struct hci_uart *hu, int id) 672 { 673 const struct hci_uart_proto *p; 674 int err; 675 676 p = hci_uart_get_proto(id); 677 if (!p) 678 return -EPROTONOSUPPORT; 679 680 err = p->open(hu); 681 if (err) 682 return err; 683 684 hu->proto = p; 685 set_bit(HCI_UART_PROTO_READY, &hu->flags); 686 687 err = hci_uart_register_dev(hu); 688 if (err) { 689 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 690 p->close(hu); 691 return err; 692 } 693 694 return 0; 695 } 696 697 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 698 { 699 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 700 BIT(HCI_UART_RESET_ON_INIT) | 701 BIT(HCI_UART_CREATE_AMP) | 702 BIT(HCI_UART_INIT_PENDING) | 703 BIT(HCI_UART_EXT_CONFIG) | 704 BIT(HCI_UART_VND_DETECT); 705 706 if (flags & ~valid_flags) 707 return -EINVAL; 708 709 hu->hdev_flags = flags; 710 711 return 0; 712 } 713 714 /* hci_uart_tty_ioctl() 715 * 716 * Process IOCTL system call for the tty device. 717 * 718 * Arguments: 719 * 720 * tty pointer to tty instance data 721 * file pointer to open file object for device 722 * cmd IOCTL command code 723 * arg argument for IOCTL call (cmd dependent) 724 * 725 * Return Value: Command dependent 726 */ 727 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 728 unsigned int cmd, unsigned long arg) 729 { 730 struct hci_uart *hu = tty->disc_data; 731 int err = 0; 732 733 BT_DBG(""); 734 735 /* Verify the status of the device */ 736 if (!hu) 737 return -EBADF; 738 739 switch (cmd) { 740 case HCIUARTSETPROTO: 741 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 742 err = hci_uart_set_proto(hu, arg); 743 if (err) 744 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 745 } else 746 err = -EBUSY; 747 break; 748 749 case HCIUARTGETPROTO: 750 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 751 err = hu->proto->id; 752 else 753 err = -EUNATCH; 754 break; 755 756 case HCIUARTGETDEVICE: 757 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 758 err = hu->hdev->id; 759 else 760 err = -EUNATCH; 761 break; 762 763 case HCIUARTSETFLAGS: 764 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 765 err = -EBUSY; 766 else 767 err = hci_uart_set_flags(hu, arg); 768 break; 769 770 case HCIUARTGETFLAGS: 771 err = hu->hdev_flags; 772 break; 773 774 default: 775 err = n_tty_ioctl_helper(tty, file, cmd, arg); 776 break; 777 } 778 779 return err; 780 } 781 782 /* 783 * We don't provide read/write/poll interface for user space. 784 */ 785 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 786 unsigned char __user *buf, size_t nr) 787 { 788 return 0; 789 } 790 791 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 792 const unsigned char *data, size_t count) 793 { 794 return 0; 795 } 796 797 static __poll_t hci_uart_tty_poll(struct tty_struct *tty, 798 struct file *filp, poll_table *wait) 799 { 800 return 0; 801 } 802 803 static int __init hci_uart_init(void) 804 { 805 static struct tty_ldisc_ops hci_uart_ldisc; 806 int err; 807 808 BT_INFO("HCI UART driver ver %s", VERSION); 809 810 /* Register the tty discipline */ 811 812 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 813 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 814 hci_uart_ldisc.name = "n_hci"; 815 hci_uart_ldisc.open = hci_uart_tty_open; 816 hci_uart_ldisc.close = hci_uart_tty_close; 817 hci_uart_ldisc.read = hci_uart_tty_read; 818 hci_uart_ldisc.write = hci_uart_tty_write; 819 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 820 hci_uart_ldisc.poll = hci_uart_tty_poll; 821 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 822 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 823 hci_uart_ldisc.owner = THIS_MODULE; 824 825 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 826 if (err) { 827 BT_ERR("HCI line discipline registration failed. (%d)", err); 828 return err; 829 } 830 831 #ifdef CONFIG_BT_HCIUART_H4 832 h4_init(); 833 #endif 834 #ifdef CONFIG_BT_HCIUART_BCSP 835 bcsp_init(); 836 #endif 837 #ifdef CONFIG_BT_HCIUART_LL 838 ll_init(); 839 #endif 840 #ifdef CONFIG_BT_HCIUART_ATH3K 841 ath_init(); 842 #endif 843 #ifdef CONFIG_BT_HCIUART_3WIRE 844 h5_init(); 845 #endif 846 #ifdef CONFIG_BT_HCIUART_INTEL 847 intel_init(); 848 #endif 849 #ifdef CONFIG_BT_HCIUART_BCM 850 bcm_init(); 851 #endif 852 #ifdef CONFIG_BT_HCIUART_QCA 853 qca_init(); 854 #endif 855 #ifdef CONFIG_BT_HCIUART_AG6XX 856 ag6xx_init(); 857 #endif 858 #ifdef CONFIG_BT_HCIUART_MRVL 859 mrvl_init(); 860 #endif 861 862 return 0; 863 } 864 865 static void __exit hci_uart_exit(void) 866 { 867 int err; 868 869 #ifdef CONFIG_BT_HCIUART_H4 870 h4_deinit(); 871 #endif 872 #ifdef CONFIG_BT_HCIUART_BCSP 873 bcsp_deinit(); 874 #endif 875 #ifdef CONFIG_BT_HCIUART_LL 876 ll_deinit(); 877 #endif 878 #ifdef CONFIG_BT_HCIUART_ATH3K 879 ath_deinit(); 880 #endif 881 #ifdef CONFIG_BT_HCIUART_3WIRE 882 h5_deinit(); 883 #endif 884 #ifdef CONFIG_BT_HCIUART_INTEL 885 intel_deinit(); 886 #endif 887 #ifdef CONFIG_BT_HCIUART_BCM 888 bcm_deinit(); 889 #endif 890 #ifdef CONFIG_BT_HCIUART_QCA 891 qca_deinit(); 892 #endif 893 #ifdef CONFIG_BT_HCIUART_AG6XX 894 ag6xx_deinit(); 895 #endif 896 #ifdef CONFIG_BT_HCIUART_MRVL 897 mrvl_deinit(); 898 #endif 899 900 /* Release tty registration of line discipline */ 901 err = tty_unregister_ldisc(N_HCI); 902 if (err) 903 BT_ERR("Can't unregister HCI line discipline (%d)", err); 904 } 905 906 module_init(hci_uart_init); 907 module_exit(hci_uart_exit); 908 909 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 910 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 911 MODULE_VERSION(VERSION); 912 MODULE_LICENSE("GPL"); 913 MODULE_ALIAS_LDISC(N_HCI); 914