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