drivers/bluetooth/hci_ldisc.c

   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
  45 #include <net/bluetooth/bluetooth.h>
  46 #include <net/bluetooth/hci_core.h>
  47
  48 #include "btintel.h"
  49 #include "btbcm.h"
  50 #include "hci_uart.h"
  51
  52 #define VERSION "2.3"
  53
  54 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
  55
  56 int hci_uart_register_proto(const struct hci_uart_proto *p)
  57 {
  58         if (p->id >= HCI_UART_MAX_PROTO)
  59                 return -EINVAL;
  60
  61         if (hup[p->id])
  62                 return -EEXIST;
  63
  64         hup[p->id] = p;
  65
  66         BT_INFO("HCI UART protocol %s registered", p->name);
  67
  68         return 0;
  69 }
  70
  71 int hci_uart_unregister_proto(const struct hci_uart_proto *p)
  72 {
  73         if (p->id >= HCI_UART_MAX_PROTO)
  74                 return -EINVAL;
  75
  76         if (!hup[p->id])
  77                 return -EINVAL;
  78
  79         hup[p->id] = NULL;
  80
  81         return 0;
  82 }
  83
  84 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
  85 {
  86         if (id >= HCI_UART_MAX_PROTO)
  87                 return NULL;
  88
  89         return hup[id];
  90 }
  91
  92 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
  93 {
  94         struct hci_dev *hdev = hu->hdev;
  95
  96         /* Update HCI stat counters */
  97         switch (pkt_type) {
  98         case HCI_COMMAND_PKT:
  99                 hdev->stat.cmd_tx++;
 100                 break;
 101
 102         case HCI_ACLDATA_PKT:
 103                 hdev->stat.acl_tx++;
 104                 break;
 105
 106         case HCI_SCODATA_PKT:
 107                 hdev->stat.sco_tx++;
 108                 break;
 109         }
 110 }
 111
 112 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
 113 {
 114         struct sk_buff *skb = hu->tx_skb;
 115
 116         if (!skb) {
 117                 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 118                         skb = hu->proto->dequeue(hu);
 119         } else {
 120                 hu->tx_skb = NULL;
 121         }
 122
 123         return skb;
 124 }
 125
 126 int hci_uart_tx_wakeup(struct hci_uart *hu)
 127 {
 128         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 129                 return 0;
 130
 131         if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
 132                 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 133                 return 0;
 134         }
 135
 136         BT_DBG("");
 137
 138         schedule_work(&hu->write_work);
 139
 140         return 0;
 141 }
 142 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
 143
 144 static void hci_uart_write_work(struct work_struct *work)
 145 {
 146         struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
 147         struct tty_struct *tty = hu->tty;
 148         struct hci_dev *hdev = hu->hdev;
 149         struct sk_buff *skb;
 150
 151         /* REVISIT: should we cope with bad skbs or ->write() returning
 152          * and error value ?
 153          */
 154
 155 restart:
 156         clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 157
 158         while ((skb = hci_uart_dequeue(hu))) {
 159                 int len;
 160
 161                 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 162                 len = tty->ops->write(tty, skb->data, skb->len);
 163                 hdev->stat.byte_tx += len;
 164
 165                 skb_pull(skb, len);
 166                 if (skb->len) {
 167                         hu->tx_skb = skb;
 168                         break;
 169                 }
 170
 171                 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
 172                 kfree_skb(skb);
 173         }
 174
 175         if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
 176                 goto restart;
 177
 178         clear_bit(HCI_UART_SENDING, &hu->tx_state);
 179 }
 180
 181 static void hci_uart_init_work(struct work_struct *work)
 182 {
 183         struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
 184         int err;
 185         struct hci_dev *hdev;
 186
 187         if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 188                 return;
 189
 190         err = hci_register_dev(hu->hdev);
 191         if (err < 0) {
 192                 BT_ERR("Can't register HCI device");
 193                 hdev = hu->hdev;
 194                 hu->hdev = NULL;
 195                 hci_free_dev(hdev);
 196                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 197                 hu->proto->close(hu);
 198                 return;
 199         }
 200
 201         set_bit(HCI_UART_REGISTERED, &hu->flags);
 202 }
 203
 204 int hci_uart_init_ready(struct hci_uart *hu)
 205 {
 206         if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 207                 return -EALREADY;
 208
 209         schedule_work(&hu->init_ready);
 210
 211         return 0;
 212 }
 213
 214 /* ------- Interface to HCI layer ------ */
 215 /* Initialize device */
 216 static int hci_uart_open(struct hci_dev *hdev)
 217 {
 218         BT_DBG("%s %p", hdev->name, hdev);
 219
 220         /* Nothing to do for UART driver */
 221         return 0;
 222 }
 223
 224 /* Reset device */
 225 static int hci_uart_flush(struct hci_dev *hdev)
 226 {
 227         struct hci_uart *hu  = hci_get_drvdata(hdev);
 228         struct tty_struct *tty = hu->tty;
 229
 230         BT_DBG("hdev %p tty %p", hdev, tty);
 231
 232         if (hu->tx_skb) {
 233                 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
 234         }
 235
 236         /* Flush any pending characters in the driver and discipline. */
 237         tty_ldisc_flush(tty);
 238         tty_driver_flush_buffer(tty);
 239
 240         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 241                 hu->proto->flush(hu);
 242
 243         return 0;
 244 }
 245
 246 /* Close device */
 247 static int hci_uart_close(struct hci_dev *hdev)
 248 {
 249         BT_DBG("hdev %p", hdev);
 250
 251         hci_uart_flush(hdev);
 252         hdev->flush = NULL;
 253         return 0;
 254 }
 255
 256 /* Send frames from HCI layer */
 257 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 258 {
 259         struct hci_uart *hu = hci_get_drvdata(hdev);
 260
 261         BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
 262                skb->len);
 263
 264         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 265                 return -EUNATCH;
 266
 267         hu->proto->enqueue(hu, skb);
 268
 269         hci_uart_tx_wakeup(hu);
 270
 271         return 0;
 272 }
 273
 274 /* Flow control or un-flow control the device */
 275 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 276 {
 277         struct tty_struct *tty = hu->tty;
 278         struct ktermios ktermios;
 279         int status;
 280         unsigned int set = 0;
 281         unsigned int clear = 0;
 282
 283         if (enable) {
 284                 /* Disable hardware flow control */
 285                 ktermios = tty->termios;
 286                 ktermios.c_cflag &= ~CRTSCTS;
 287                 status = tty_set_termios(tty, &ktermios);
 288                 BT_DBG("Disabling hardware flow control: %s",
 289                        status ? "failed" : "success");
 290
 291                 /* Clear RTS to prevent the device from sending */
 292                 /* Most UARTs need OUT2 to enable interrupts */
 293                 status = tty->driver->ops->tiocmget(tty);
 294                 BT_DBG("Current tiocm 0x%x", status);
 295
 296                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 297                 clear = ~set;
 298                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 299                        TIOCM_OUT2 | TIOCM_LOOP;
 300                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 301                          TIOCM_OUT2 | TIOCM_LOOP;
 302                 status = tty->driver->ops->tiocmset(tty, set, clear);
 303                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 304         } else {
 305                 /* Set RTS to allow the device to send again */
 306                 status = tty->driver->ops->tiocmget(tty);
 307                 BT_DBG("Current tiocm 0x%x", status);
 308
 309                 set |= (TIOCM_OUT2 | TIOCM_RTS);
 310                 clear = ~set;
 311                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 312                        TIOCM_OUT2 | TIOCM_LOOP;
 313                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 314                          TIOCM_OUT2 | TIOCM_LOOP;
 315                 status = tty->driver->ops->tiocmset(tty, set, clear);
 316                 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
 317
 318                 /* Re-enable hardware flow control */
 319                 ktermios = tty->termios;
 320                 ktermios.c_cflag |= CRTSCTS;
 321                 status = tty_set_termios(tty, &ktermios);
 322                 BT_DBG("Enabling hardware flow control: %s",
 323                        status ? "failed" : "success");
 324         }
 325 }
 326
 327 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 328                          unsigned int oper_speed)
 329 {
 330         hu->init_speed = init_speed;
 331         hu->oper_speed = oper_speed;
 332 }
 333
 334 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 335 {
 336         struct tty_struct *tty = hu->tty;
 337         struct ktermios ktermios;
 338
 339         ktermios = tty->termios;
 340         ktermios.c_cflag &= ~CBAUD;
 341         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 342
 343         /* tty_set_termios() return not checked as it is always 0 */
 344         tty_set_termios(tty, &ktermios);
 345
 346         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 347                tty->termios.c_ispeed, tty->termios.c_ospeed);
 348 }
 349
 350 static int hci_uart_setup(struct hci_dev *hdev)
 351 {
 352         struct hci_uart *hu = hci_get_drvdata(hdev);
 353         struct hci_rp_read_local_version *ver;
 354         struct sk_buff *skb;
 355         unsigned int speed;
 356         int err;
 357
 358         /* Init speed if any */
 359         if (hu->init_speed)
 360                 speed = hu->init_speed;
 361         else if (hu->proto->init_speed)
 362                 speed = hu->proto->init_speed;
 363         else
 364                 speed = 0;
 365
 366         if (speed)
 367                 hci_uart_set_baudrate(hu, speed);
 368
 369         /* Operational speed if any */
 370         if (hu->oper_speed)
 371                 speed = hu->oper_speed;
 372         else if (hu->proto->oper_speed)
 373                 speed = hu->proto->oper_speed;
 374         else
 375                 speed = 0;
 376
 377         if (hu->proto->set_baudrate && speed) {
 378                 err = hu->proto->set_baudrate(hu, speed);
 379                 if (!err)
 380                         hci_uart_set_baudrate(hu, speed);
 381         }
 382
 383         if (hu->proto->setup)
 384                 return hu->proto->setup(hu);
 385
 386         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 387                 return 0;
 388
 389         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 390                              HCI_INIT_TIMEOUT);
 391         if (IS_ERR(skb)) {
 392                 BT_ERR("%s: Reading local version information failed (%ld)",
 393                        hdev->name, PTR_ERR(skb));
 394                 return 0;
 395         }
 396
 397         if (skb->len != sizeof(*ver)) {
 398                 BT_ERR("%s: Event length mismatch for version information",
 399                        hdev->name);
 400                 goto done;
 401         }
 402
 403         ver = (struct hci_rp_read_local_version *)skb->data;
 404
 405         switch (le16_to_cpu(ver->manufacturer)) {
 406 #ifdef CONFIG_BT_HCIUART_INTEL
 407         case 2:
 408                 hdev->set_bdaddr = btintel_set_bdaddr;
 409                 btintel_check_bdaddr(hdev);
 410                 break;
 411 #endif
 412 #ifdef CONFIG_BT_HCIUART_BCM
 413         case 15:
 414                 hdev->set_bdaddr = btbcm_set_bdaddr;
 415                 btbcm_check_bdaddr(hdev);
 416                 break;
 417 #endif
 418         }
 419
 420 done:
 421         kfree_skb(skb);
 422         return 0;
 423 }
 424
 425 /* ------ LDISC part ------ */
 426 /* hci_uart_tty_open
 427  *
 428  *     Called when line discipline changed to HCI_UART.
 429  *
 430  * Arguments:
 431  *     tty    pointer to tty info structure
 432  * Return Value:
 433  *     0 if success, otherwise error code
 434  */
 435 static int hci_uart_tty_open(struct tty_struct *tty)
 436 {
 437         struct hci_uart *hu;
 438
 439         BT_DBG("tty %p", tty);
 440
 441         /* Error if the tty has no write op instead of leaving an exploitable
 442            hole */
 443         if (tty->ops->write == NULL)
 444                 return -EOPNOTSUPP;
 445
 446         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 447         if (!hu) {
 448                 BT_ERR("Can't allocate control structure");
 449                 return -ENFILE;
 450         }
 451
 452         tty->disc_data = hu;
 453         hu->tty = tty;
 454         tty->receive_room = 65536;
 455
 456         /* disable alignment support by default */
 457         hu->alignment = 1;
 458         hu->padding = 0;
 459
 460         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 461         INIT_WORK(&hu->write_work, hci_uart_write_work);
 462
 463         /* Flush any pending characters in the driver */
 464         tty_driver_flush_buffer(tty);
 465
 466         return 0;
 467 }
 468
 469 /* hci_uart_tty_close()
 470  *
 471  *    Called when the line discipline is changed to something
 472  *    else, the tty is closed, or the tty detects a hangup.
 473  */
 474 static void hci_uart_tty_close(struct tty_struct *tty)
 475 {
 476         struct hci_uart *hu = tty->disc_data;
 477         struct hci_dev *hdev;
 478
 479         BT_DBG("tty %p", tty);
 480
 481         /* Detach from the tty */
 482         tty->disc_data = NULL;
 483
 484         if (!hu)
 485                 return;
 486
 487         hdev = hu->hdev;
 488         if (hdev)
 489                 hci_uart_close(hdev);
 490
 491         cancel_work_sync(&hu->write_work);
 492
 493         if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 494                 if (hdev) {
 495                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 496                                 hci_unregister_dev(hdev);
 497                         hci_free_dev(hdev);
 498                 }
 499                 hu->proto->close(hu);
 500         }
 501         clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 502
 503         kfree(hu);
 504 }
 505
 506 /* hci_uart_tty_wakeup()
 507  *
 508  *    Callback for transmit wakeup. Called when low level
 509  *    device driver can accept more send data.
 510  *
 511  * Arguments:        tty    pointer to associated tty instance data
 512  * Return Value:    None
 513  */
 514 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 515 {
 516         struct hci_uart *hu = tty->disc_data;
 517
 518         BT_DBG("");
 519
 520         if (!hu)
 521                 return;
 522
 523         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 524
 525         if (tty != hu->tty)
 526                 return;
 527
 528         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 529                 hci_uart_tx_wakeup(hu);
 530 }
 531
 532 /* hci_uart_tty_receive()
 533  *
 534  *     Called by tty low level driver when receive data is
 535  *     available.
 536  *
 537  * Arguments:  tty          pointer to tty isntance data
 538  *             data         pointer to received data
 539  *             flags        pointer to flags for data
 540  *             count        count of received data in bytes
 541  *
 542  * Return Value:    None
 543  */
 544 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 545                                  char *flags, int count)
 546 {
 547         struct hci_uart *hu = tty->disc_data;
 548
 549         if (!hu || tty != hu->tty)
 550                 return;
 551
 552         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 553                 return;
 554
 555         /* It does not need a lock here as it is already protected by a mutex in
 556          * tty caller
 557          */
 558         hu->proto->recv(hu, data, count);
 559
 560         if (hu->hdev)
 561                 hu->hdev->stat.byte_rx += count;
 562
 563         tty_unthrottle(tty);
 564 }
 565
 566 static int hci_uart_register_dev(struct hci_uart *hu)
 567 {
 568         struct hci_dev *hdev;
 569
 570         BT_DBG("");
 571
 572         /* Initialize and register HCI device */
 573         hdev = hci_alloc_dev();
 574         if (!hdev) {
 575                 BT_ERR("Can't allocate HCI device");
 576                 return -ENOMEM;
 577         }
 578
 579         hu->hdev = hdev;
 580
 581         hdev->bus = HCI_UART;
 582         hci_set_drvdata(hdev, hu);
 583
 584         /* Only when vendor specific setup callback is provided, consider
 585          * the manufacturer information valid. This avoids filling in the
 586          * value for Ericsson when nothing is specified.
 587          */
 588         if (hu->proto->setup)
 589                 hdev->manufacturer = hu->proto->manufacturer;
 590
 591         hdev->open  = hci_uart_open;
 592         hdev->close = hci_uart_close;
 593         hdev->flush = hci_uart_flush;
 594         hdev->send  = hci_uart_send_frame;
 595         hdev->setup = hci_uart_setup;
 596         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 597
 598         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 599                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 600
 601         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 602                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 603
 604         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 605                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 606
 607         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 608                 hdev->dev_type = HCI_AMP;
 609         else
 610                 hdev->dev_type = HCI_PRIMARY;
 611
 612         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 613                 return 0;
 614
 615         if (hci_register_dev(hdev) < 0) {
 616                 BT_ERR("Can't register HCI device");
 617                 hu->hdev = NULL;
 618                 hci_free_dev(hdev);
 619                 return -ENODEV;
 620         }
 621
 622         set_bit(HCI_UART_REGISTERED, &hu->flags);
 623
 624         return 0;
 625 }
 626
 627 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 628 {
 629         const struct hci_uart_proto *p;
 630         int err;
 631
 632         p = hci_uart_get_proto(id);
 633         if (!p)
 634                 return -EPROTONOSUPPORT;
 635
 636         err = p->open(hu);
 637         if (err)
 638                 return err;
 639
 640         hu->proto = p;
 641         set_bit(HCI_UART_PROTO_READY, &hu->flags);
 642
 643         err = hci_uart_register_dev(hu);
 644         if (err) {
 645                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 646                 p->close(hu);
 647                 return err;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 654 {
 655         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 656                                     BIT(HCI_UART_RESET_ON_INIT) |
 657                                     BIT(HCI_UART_CREATE_AMP) |
 658                                     BIT(HCI_UART_INIT_PENDING) |
 659                                     BIT(HCI_UART_EXT_CONFIG) |
 660                                     BIT(HCI_UART_VND_DETECT);
 661
 662         if (flags & ~valid_flags)
 663                 return -EINVAL;
 664
 665         hu->hdev_flags = flags;
 666
 667         return 0;
 668 }
 669
 670 /* hci_uart_tty_ioctl()
 671  *
 672  *    Process IOCTL system call for the tty device.
 673  *
 674  * Arguments:
 675  *
 676  *    tty        pointer to tty instance data
 677  *    file       pointer to open file object for device
 678  *    cmd        IOCTL command code
 679  *    arg        argument for IOCTL call (cmd dependent)
 680  *
 681  * Return Value:    Command dependent
 682  */
 683 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 684                               unsigned int cmd, unsigned long arg)
 685 {
 686         struct hci_uart *hu = tty->disc_data;
 687         int err = 0;
 688
 689         BT_DBG("");
 690
 691         /* Verify the status of the device */
 692         if (!hu)
 693                 return -EBADF;
 694
 695         switch (cmd) {
 696         case HCIUARTSETPROTO:
 697                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 698                         err = hci_uart_set_proto(hu, arg);
 699                         if (err)
 700                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 701                 } else
 702                         err = -EBUSY;
 703                 break;
 704
 705         case HCIUARTGETPROTO:
 706                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 707                         err = hu->proto->id;
 708                 else
 709                         err = -EUNATCH;
 710                 break;
 711
 712         case HCIUARTGETDEVICE:
 713                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 714                         err = hu->hdev->id;
 715                 else
 716                         err = -EUNATCH;
 717                 break;
 718
 719         case HCIUARTSETFLAGS:
 720                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 721                         err = -EBUSY;
 722                 else
 723                         err = hci_uart_set_flags(hu, arg);
 724                 break;
 725
 726         case HCIUARTGETFLAGS:
 727                 err = hu->hdev_flags;
 728                 break;
 729
 730         default:
 731                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 732                 break;
 733         }
 734
 735         return err;
 736 }
 737
 738 /*
 739  * We don't provide read/write/poll interface for user space.
 740  */
 741 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 742                                  unsigned char __user *buf, size_t nr)
 743 {
 744         return 0;
 745 }
 746
 747 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 748                                   const unsigned char *data, size_t count)
 749 {
 750         return 0;
 751 }
 752
 753 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 754                                       struct file *filp, poll_table *wait)
 755 {
 756         return 0;
 757 }
 758
 759 static int __init hci_uart_init(void)
 760 {
 761         static struct tty_ldisc_ops hci_uart_ldisc;
 762         int err;
 763
 764         BT_INFO("HCI UART driver ver %s", VERSION);
 765
 766         /* Register the tty discipline */
 767
 768         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 769         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 770         hci_uart_ldisc.name             = "n_hci";
 771         hci_uart_ldisc.open             = hci_uart_tty_open;
 772         hci_uart_ldisc.close            = hci_uart_tty_close;
 773         hci_uart_ldisc.read             = hci_uart_tty_read;
 774         hci_uart_ldisc.write            = hci_uart_tty_write;
 775         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 776         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 777         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 778         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 779         hci_uart_ldisc.owner            = THIS_MODULE;
 780
 781         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 782         if (err) {
 783                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 784                 return err;
 785         }
 786
 787 #ifdef CONFIG_BT_HCIUART_H4
 788         h4_init();
 789 #endif
 790 #ifdef CONFIG_BT_HCIUART_BCSP
 791         bcsp_init();
 792 #endif
 793 #ifdef CONFIG_BT_HCIUART_LL
 794         ll_init();
 795 #endif
 796 #ifdef CONFIG_BT_HCIUART_ATH3K
 797         ath_init();
 798 #endif
 799 #ifdef CONFIG_BT_HCIUART_3WIRE
 800         h5_init();
 801 #endif
 802 #ifdef CONFIG_BT_HCIUART_INTEL
 803         intel_init();
 804 #endif
 805 #ifdef CONFIG_BT_HCIUART_BCM
 806         bcm_init();
 807 #endif
 808 #ifdef CONFIG_BT_HCIUART_QCA
 809         qca_init();
 810 #endif
 811 #ifdef CONFIG_BT_HCIUART_AG6XX
 812         ag6xx_init();
 813 #endif
 814 #ifdef CONFIG_BT_HCIUART_MRVL
 815         mrvl_init();
 816 #endif
 817
 818         return 0;
 819 }
 820
 821 static void __exit hci_uart_exit(void)
 822 {
 823         int err;
 824
 825 #ifdef CONFIG_BT_HCIUART_H4
 826         h4_deinit();
 827 #endif
 828 #ifdef CONFIG_BT_HCIUART_BCSP
 829         bcsp_deinit();
 830 #endif
 831 #ifdef CONFIG_BT_HCIUART_LL
 832         ll_deinit();
 833 #endif
 834 #ifdef CONFIG_BT_HCIUART_ATH3K
 835         ath_deinit();
 836 #endif
 837 #ifdef CONFIG_BT_HCIUART_3WIRE
 838         h5_deinit();
 839 #endif
 840 #ifdef CONFIG_BT_HCIUART_INTEL
 841         intel_deinit();
 842 #endif
 843 #ifdef CONFIG_BT_HCIUART_BCM
 844         bcm_deinit();
 845 #endif
 846 #ifdef CONFIG_BT_HCIUART_QCA
 847         qca_deinit();
 848 #endif
 849 #ifdef CONFIG_BT_HCIUART_AG6XX
 850         ag6xx_deinit();
 851 #endif
 852 #ifdef CONFIG_BT_HCIUART_MRVL
 853         mrvl_deinit();
 854 #endif
 855
 856         /* Release tty registration of line discipline */
 857         err = tty_unregister_ldisc(N_HCI);
 858         if (err)
 859                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 860 }
 861
 862 module_init(hci_uart_init);
 863 module_exit(hci_uart_exit);
 864
 865 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 866 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 867 MODULE_VERSION(VERSION);
 868 MODULE_LICENSE("GPL");
 869 MODULE_ALIAS_LDISC(N_HCI);