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 default: 451 break; 452 } 453 454 done: 455 kfree_skb(skb); 456 return 0; 457 } 458 459 /* ------ LDISC part ------ */ 460 /* hci_uart_tty_open 461 * 462 * Called when line discipline changed to HCI_UART. 463 * 464 * Arguments: 465 * tty pointer to tty info structure 466 * Return Value: 467 * 0 if success, otherwise error code 468 */ 469 static int hci_uart_tty_open(struct tty_struct *tty) 470 { 471 struct hci_uart *hu; 472 473 BT_DBG("tty %p", tty); 474 475 /* Error if the tty has no write op instead of leaving an exploitable 476 * hole 477 */ 478 if (tty->ops->write == NULL) 479 return -EOPNOTSUPP; 480 481 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL); 482 if (!hu) { 483 BT_ERR("Can't allocate control structure"); 484 return -ENFILE; 485 } 486 487 tty->disc_data = hu; 488 hu->tty = tty; 489 tty->receive_room = 65536; 490 491 /* disable alignment support by default */ 492 hu->alignment = 1; 493 hu->padding = 0; 494 495 INIT_WORK(&hu->init_ready, hci_uart_init_work); 496 INIT_WORK(&hu->write_work, hci_uart_write_work); 497 498 percpu_init_rwsem(&hu->proto_lock); 499 500 /* Flush any pending characters in the driver */ 501 tty_driver_flush_buffer(tty); 502 503 return 0; 504 } 505 506 /* hci_uart_tty_close() 507 * 508 * Called when the line discipline is changed to something 509 * else, the tty is closed, or the tty detects a hangup. 510 */ 511 static void hci_uart_tty_close(struct tty_struct *tty) 512 { 513 struct hci_uart *hu = tty->disc_data; 514 struct hci_dev *hdev; 515 516 BT_DBG("tty %p", tty); 517 518 /* Detach from the tty */ 519 tty->disc_data = NULL; 520 521 if (!hu) 522 return; 523 524 hdev = hu->hdev; 525 if (hdev) 526 hci_uart_close(hdev); 527 528 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 529 percpu_down_write(&hu->proto_lock); 530 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 531 percpu_up_write(&hu->proto_lock); 532 533 cancel_work_sync(&hu->write_work); 534 535 if (hdev) { 536 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 537 hci_unregister_dev(hdev); 538 hci_free_dev(hdev); 539 } 540 hu->proto->close(hu); 541 } 542 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 543 544 kfree(hu); 545 } 546 547 /* hci_uart_tty_wakeup() 548 * 549 * Callback for transmit wakeup. Called when low level 550 * device driver can accept more send data. 551 * 552 * Arguments: tty pointer to associated tty instance data 553 * Return Value: None 554 */ 555 static void hci_uart_tty_wakeup(struct tty_struct *tty) 556 { 557 struct hci_uart *hu = tty->disc_data; 558 559 BT_DBG(""); 560 561 if (!hu) 562 return; 563 564 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); 565 566 if (tty != hu->tty) 567 return; 568 569 if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) 570 hci_uart_tx_wakeup(hu); 571 } 572 573 /* hci_uart_tty_receive() 574 * 575 * Called by tty low level driver when receive data is 576 * available. 577 * 578 * Arguments: tty pointer to tty isntance data 579 * data pointer to received data 580 * flags pointer to flags for data 581 * count count of received data in bytes 582 * 583 * Return Value: None 584 */ 585 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, 586 char *flags, int count) 587 { 588 struct hci_uart *hu = tty->disc_data; 589 590 if (!hu || tty != hu->tty) 591 return; 592 593 percpu_down_read(&hu->proto_lock); 594 595 if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { 596 percpu_up_read(&hu->proto_lock); 597 return; 598 } 599 600 /* It does not need a lock here as it is already protected by a mutex in 601 * tty caller 602 */ 603 hu->proto->recv(hu, data, count); 604 percpu_up_read(&hu->proto_lock); 605 606 if (hu->hdev) 607 hu->hdev->stat.byte_rx += count; 608 609 tty_unthrottle(tty); 610 } 611 612 static int hci_uart_register_dev(struct hci_uart *hu) 613 { 614 struct hci_dev *hdev; 615 616 BT_DBG(""); 617 618 /* Initialize and register HCI device */ 619 hdev = hci_alloc_dev(); 620 if (!hdev) { 621 BT_ERR("Can't allocate HCI device"); 622 return -ENOMEM; 623 } 624 625 hu->hdev = hdev; 626 627 hdev->bus = HCI_UART; 628 hci_set_drvdata(hdev, hu); 629 630 /* Only when vendor specific setup callback is provided, consider 631 * the manufacturer information valid. This avoids filling in the 632 * value for Ericsson when nothing is specified. 633 */ 634 if (hu->proto->setup) 635 hdev->manufacturer = hu->proto->manufacturer; 636 637 hdev->open = hci_uart_open; 638 hdev->close = hci_uart_close; 639 hdev->flush = hci_uart_flush; 640 hdev->send = hci_uart_send_frame; 641 hdev->setup = hci_uart_setup; 642 SET_HCIDEV_DEV(hdev, hu->tty->dev); 643 644 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) 645 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); 646 647 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags)) 648 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); 649 650 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags)) 651 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); 652 653 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags)) 654 hdev->dev_type = HCI_AMP; 655 else 656 hdev->dev_type = HCI_PRIMARY; 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->hdev = NULL; 664 hci_free_dev(hdev); 665 return -ENODEV; 666 } 667 668 set_bit(HCI_UART_REGISTERED, &hu->flags); 669 670 return 0; 671 } 672 673 static int hci_uart_set_proto(struct hci_uart *hu, int id) 674 { 675 const struct hci_uart_proto *p; 676 int err; 677 678 p = hci_uart_get_proto(id); 679 if (!p) 680 return -EPROTONOSUPPORT; 681 682 err = p->open(hu); 683 if (err) 684 return err; 685 686 hu->proto = p; 687 set_bit(HCI_UART_PROTO_READY, &hu->flags); 688 689 err = hci_uart_register_dev(hu); 690 if (err) { 691 clear_bit(HCI_UART_PROTO_READY, &hu->flags); 692 p->close(hu); 693 return err; 694 } 695 696 return 0; 697 } 698 699 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags) 700 { 701 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) | 702 BIT(HCI_UART_RESET_ON_INIT) | 703 BIT(HCI_UART_CREATE_AMP) | 704 BIT(HCI_UART_INIT_PENDING) | 705 BIT(HCI_UART_EXT_CONFIG) | 706 BIT(HCI_UART_VND_DETECT); 707 708 if (flags & ~valid_flags) 709 return -EINVAL; 710 711 hu->hdev_flags = flags; 712 713 return 0; 714 } 715 716 /* hci_uart_tty_ioctl() 717 * 718 * Process IOCTL system call for the tty device. 719 * 720 * Arguments: 721 * 722 * tty pointer to tty instance data 723 * file pointer to open file object for device 724 * cmd IOCTL command code 725 * arg argument for IOCTL call (cmd dependent) 726 * 727 * Return Value: Command dependent 728 */ 729 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file, 730 unsigned int cmd, unsigned long arg) 731 { 732 struct hci_uart *hu = tty->disc_data; 733 int err = 0; 734 735 BT_DBG(""); 736 737 /* Verify the status of the device */ 738 if (!hu) 739 return -EBADF; 740 741 switch (cmd) { 742 case HCIUARTSETPROTO: 743 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) { 744 err = hci_uart_set_proto(hu, arg); 745 if (err) 746 clear_bit(HCI_UART_PROTO_SET, &hu->flags); 747 } else 748 err = -EBUSY; 749 break; 750 751 case HCIUARTGETPROTO: 752 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 753 err = hu->proto->id; 754 else 755 err = -EUNATCH; 756 break; 757 758 case HCIUARTGETDEVICE: 759 if (test_bit(HCI_UART_REGISTERED, &hu->flags)) 760 err = hu->hdev->id; 761 else 762 err = -EUNATCH; 763 break; 764 765 case HCIUARTSETFLAGS: 766 if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) 767 err = -EBUSY; 768 else 769 err = hci_uart_set_flags(hu, arg); 770 break; 771 772 case HCIUARTGETFLAGS: 773 err = hu->hdev_flags; 774 break; 775 776 default: 777 err = n_tty_ioctl_helper(tty, file, cmd, arg); 778 break; 779 } 780 781 return err; 782 } 783 784 /* 785 * We don't provide read/write/poll interface for user space. 786 */ 787 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file, 788 unsigned char __user *buf, size_t nr) 789 { 790 return 0; 791 } 792 793 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file, 794 const unsigned char *data, size_t count) 795 { 796 return 0; 797 } 798 799 static __poll_t hci_uart_tty_poll(struct tty_struct *tty, 800 struct file *filp, poll_table *wait) 801 { 802 return 0; 803 } 804 805 static int __init hci_uart_init(void) 806 { 807 static struct tty_ldisc_ops hci_uart_ldisc; 808 int err; 809 810 BT_INFO("HCI UART driver ver %s", VERSION); 811 812 /* Register the tty discipline */ 813 814 memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc)); 815 hci_uart_ldisc.magic = TTY_LDISC_MAGIC; 816 hci_uart_ldisc.name = "n_hci"; 817 hci_uart_ldisc.open = hci_uart_tty_open; 818 hci_uart_ldisc.close = hci_uart_tty_close; 819 hci_uart_ldisc.read = hci_uart_tty_read; 820 hci_uart_ldisc.write = hci_uart_tty_write; 821 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl; 822 hci_uart_ldisc.poll = hci_uart_tty_poll; 823 hci_uart_ldisc.receive_buf = hci_uart_tty_receive; 824 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup; 825 hci_uart_ldisc.owner = THIS_MODULE; 826 827 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc); 828 if (err) { 829 BT_ERR("HCI line discipline registration failed. (%d)", err); 830 return err; 831 } 832 833 #ifdef CONFIG_BT_HCIUART_H4 834 h4_init(); 835 #endif 836 #ifdef CONFIG_BT_HCIUART_BCSP 837 bcsp_init(); 838 #endif 839 #ifdef CONFIG_BT_HCIUART_LL 840 ll_init(); 841 #endif 842 #ifdef CONFIG_BT_HCIUART_ATH3K 843 ath_init(); 844 #endif 845 #ifdef CONFIG_BT_HCIUART_3WIRE 846 h5_init(); 847 #endif 848 #ifdef CONFIG_BT_HCIUART_INTEL 849 intel_init(); 850 #endif 851 #ifdef CONFIG_BT_HCIUART_BCM 852 bcm_init(); 853 #endif 854 #ifdef CONFIG_BT_HCIUART_QCA 855 qca_init(); 856 #endif 857 #ifdef CONFIG_BT_HCIUART_AG6XX 858 ag6xx_init(); 859 #endif 860 #ifdef CONFIG_BT_HCIUART_MRVL 861 mrvl_init(); 862 #endif 863 864 return 0; 865 } 866 867 static void __exit hci_uart_exit(void) 868 { 869 int err; 870 871 #ifdef CONFIG_BT_HCIUART_H4 872 h4_deinit(); 873 #endif 874 #ifdef CONFIG_BT_HCIUART_BCSP 875 bcsp_deinit(); 876 #endif 877 #ifdef CONFIG_BT_HCIUART_LL 878 ll_deinit(); 879 #endif 880 #ifdef CONFIG_BT_HCIUART_ATH3K 881 ath_deinit(); 882 #endif 883 #ifdef CONFIG_BT_HCIUART_3WIRE 884 h5_deinit(); 885 #endif 886 #ifdef CONFIG_BT_HCIUART_INTEL 887 intel_deinit(); 888 #endif 889 #ifdef CONFIG_BT_HCIUART_BCM 890 bcm_deinit(); 891 #endif 892 #ifdef CONFIG_BT_HCIUART_QCA 893 qca_deinit(); 894 #endif 895 #ifdef CONFIG_BT_HCIUART_AG6XX 896 ag6xx_deinit(); 897 #endif 898 #ifdef CONFIG_BT_HCIUART_MRVL 899 mrvl_deinit(); 900 #endif 901 902 /* Release tty registration of line discipline */ 903 err = tty_unregister_ldisc(N_HCI); 904 if (err) 905 BT_ERR("Can't unregister HCI line discipline (%d)", err); 906 } 907 908 module_init(hci_uart_init); 909 module_exit(hci_uart_exit); 910 911 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 912 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION); 913 MODULE_VERSION(VERSION); 914 MODULE_LICENSE("GPL"); 915 MODULE_ALIAS_LDISC(N_HCI); 916