drivers/bluetooth/hci_ldisc.c

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