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                 skb = hu->proto->dequeue(hu);
 118         else
 119                 hu->tx_skb = NULL;
 120
 121         return skb;
 122 }
 123
 124 int hci_uart_tx_wakeup(struct hci_uart *hu)
 125 {
 126         if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
 127                 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 128                 return 0;
 129         }
 130
 131         BT_DBG("");
 132
 133         schedule_work(&hu->write_work);
 134
 135         return 0;
 136 }
 137
 138 static void hci_uart_write_work(struct work_struct *work)
 139 {
 140         struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
 141         struct tty_struct *tty = hu->tty;
 142         struct hci_dev *hdev = hu->hdev;
 143         struct sk_buff *skb;
 144
 145         /* REVISIT: should we cope with bad skbs or ->write() returning
 146          * and error value ?
 147          */
 148
 149 restart:
 150         clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 151
 152         while ((skb = hci_uart_dequeue(hu))) {
 153                 int len;
 154
 155                 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 156                 len = tty->ops->write(tty, skb->data, skb->len);
 157                 hdev->stat.byte_tx += len;
 158
 159                 skb_pull(skb, len);
 160                 if (skb->len) {
 161                         hu->tx_skb = skb;
 162                         break;
 163                 }
 164
 165                 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
 166                 kfree_skb(skb);
 167         }
 168
 169         if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
 170                 goto restart;
 171
 172         clear_bit(HCI_UART_SENDING, &hu->tx_state);
 173 }
 174
 175 static void hci_uart_init_work(struct work_struct *work)
 176 {
 177         struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
 178         int err;
 179
 180         if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 181                 return;
 182
 183         err = hci_register_dev(hu->hdev);
 184         if (err < 0) {
 185                 BT_ERR("Can't register HCI device");
 186                 hci_free_dev(hu->hdev);
 187                 hu->hdev = NULL;
 188                 hu->proto->close(hu);
 189         }
 190
 191         set_bit(HCI_UART_REGISTERED, &hu->flags);
 192 }
 193
 194 int hci_uart_init_ready(struct hci_uart *hu)
 195 {
 196         if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 197                 return -EALREADY;
 198
 199         schedule_work(&hu->init_ready);
 200
 201         return 0;
 202 }
 203
 204 /* ------- Interface to HCI layer ------ */
 205 /* Initialize device */
 206 static int hci_uart_open(struct hci_dev *hdev)
 207 {
 208         BT_DBG("%s %p", hdev->name, hdev);
 209
 210         /* Nothing to do for UART driver */
 211
 212         set_bit(HCI_RUNNING, &hdev->flags);
 213
 214         return 0;
 215 }
 216
 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         if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 234                 hu->proto->flush(hu);
 235
 236         return 0;
 237 }
 238
 239 /* Close device */
 240 static int hci_uart_close(struct hci_dev *hdev)
 241 {
 242         BT_DBG("hdev %p", hdev);
 243
 244         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 245                 return 0;
 246
 247         hci_uart_flush(hdev);
 248         hdev->flush = NULL;
 249         return 0;
 250 }
 251
 252 /* Send frames from HCI layer */
 253 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 254 {
 255         struct hci_uart *hu = hci_get_drvdata(hdev);
 256
 257         if (!test_bit(HCI_RUNNING, &hdev->flags))
 258                 return -EBUSY;
 259
 260         BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
 261
 262         hu->proto->enqueue(hu, skb);
 263
 264         hci_uart_tx_wakeup(hu);
 265
 266         return 0;
 267 }
 268
 269 /* Flow control or un-flow control the device */
 270 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 271 {
 272         struct tty_struct *tty = hu->tty;
 273         struct ktermios ktermios;
 274         int status;
 275         unsigned int set = 0;
 276         unsigned int clear = 0;
 277
 278         if (enable) {
 279                 /* Disable hardware flow control */
 280                 ktermios = tty->termios;
 281                 ktermios.c_cflag &= ~CRTSCTS;
 282                 status = tty_set_termios(tty, &ktermios);
 283                 BT_DBG("Disabling hardware flow control: %s",
 284                        status ? "failed" : "success");
 285
 286                 /* Clear RTS to prevent the device from sending */
 287                 /* Most UARTs need OUT2 to enable interrupts */
 288                 status = tty->driver->ops->tiocmget(tty);
 289                 BT_DBG("Current tiocm 0x%x", status);
 290
 291                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 292                 clear = ~set;
 293                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 294                        TIOCM_OUT2 | TIOCM_LOOP;
 295                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 296                          TIOCM_OUT2 | TIOCM_LOOP;
 297                 status = tty->driver->ops->tiocmset(tty, set, clear);
 298                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 299         } else {
 300                 /* Set RTS to allow the device to send again */
 301                 status = tty->driver->ops->tiocmget(tty);
 302                 BT_DBG("Current tiocm 0x%x", status);
 303
 304                 set |= (TIOCM_OUT2 | TIOCM_RTS);
 305                 clear = ~set;
 306                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 307                        TIOCM_OUT2 | TIOCM_LOOP;
 308                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 309                          TIOCM_OUT2 | TIOCM_LOOP;
 310                 status = tty->driver->ops->tiocmset(tty, set, clear);
 311                 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
 312
 313                 /* Re-enable hardware flow control */
 314                 ktermios = tty->termios;
 315                 ktermios.c_cflag |= CRTSCTS;
 316                 status = tty_set_termios(tty, &ktermios);
 317                 BT_DBG("Enabling hardware flow control: %s",
 318                        status ? "failed" : "success");
 319         }
 320 }
 321
 322 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 323                          unsigned int oper_speed)
 324 {
 325         hu->init_speed = init_speed;
 326         hu->oper_speed = oper_speed;
 327 }
 328
 329 void hci_uart_init_tty(struct hci_uart *hu)
 330 {
 331         struct tty_struct *tty = hu->tty;
 332         struct ktermios ktermios;
 333
 334         /* Bring the UART into a known 8 bits no parity hw fc state */
 335         ktermios = tty->termios;
 336         ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
 337                               INLCR | IGNCR | ICRNL | IXON);
 338         ktermios.c_oflag &= ~OPOST;
 339         ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 340         ktermios.c_cflag &= ~(CSIZE | PARENB);
 341         ktermios.c_cflag |= CS8;
 342         ktermios.c_cflag |= CRTSCTS;
 343
 344         /* tty_set_termios() return not checked as it is always 0 */
 345         tty_set_termios(tty, &ktermios);
 346 }
 347
 348 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 349 {
 350         struct tty_struct *tty = hu->tty;
 351         struct ktermios ktermios;
 352
 353         ktermios = tty->termios;
 354         ktermios.c_cflag &= ~CBAUD;
 355         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 356
 357         /* tty_set_termios() return not checked as it is always 0 */
 358         tty_set_termios(tty, &ktermios);
 359
 360         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 361                tty->termios.c_ispeed, tty->termios.c_ospeed);
 362 }
 363
 364 static int hci_uart_setup(struct hci_dev *hdev)
 365 {
 366         struct hci_uart *hu = hci_get_drvdata(hdev);
 367         struct hci_rp_read_local_version *ver;
 368         struct sk_buff *skb;
 369         unsigned int speed;
 370         int err;
 371
 372         /* Init speed if any */
 373         if (hu->init_speed)
 374                 speed = hu->init_speed;
 375         else if (hu->proto->init_speed)
 376                 speed = hu->proto->init_speed;
 377         else
 378                 speed = 0;
 379
 380         if (speed)
 381                 hci_uart_set_baudrate(hu, speed);
 382
 383         /* Operational speed if any */
 384         if (hu->oper_speed)
 385                 speed = hu->oper_speed;
 386         else if (hu->proto->oper_speed)
 387                 speed = hu->proto->oper_speed;
 388         else
 389                 speed = 0;
 390
 391         if (hu->proto->set_baudrate && speed) {
 392                 err = hu->proto->set_baudrate(hu, speed);
 393                 if (!err)
 394                         hci_uart_set_baudrate(hu, speed);
 395         }
 396
 397         if (hu->proto->setup)
 398                 return hu->proto->setup(hu);
 399
 400         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 401                 return 0;
 402
 403         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 404                              HCI_INIT_TIMEOUT);
 405         if (IS_ERR(skb)) {
 406                 BT_ERR("%s: Reading local version information failed (%ld)",
 407                        hdev->name, PTR_ERR(skb));
 408                 return 0;
 409         }
 410
 411         if (skb->len != sizeof(*ver)) {
 412                 BT_ERR("%s: Event length mismatch for version information",
 413                        hdev->name);
 414                 goto done;
 415         }
 416
 417         ver = (struct hci_rp_read_local_version *)skb->data;
 418
 419         switch (le16_to_cpu(ver->manufacturer)) {
 420 #ifdef CONFIG_BT_HCIUART_INTEL
 421         case 2:
 422                 hdev->set_bdaddr = btintel_set_bdaddr;
 423                 btintel_check_bdaddr(hdev);
 424                 break;
 425 #endif
 426 #ifdef CONFIG_BT_HCIUART_BCM
 427         case 15:
 428                 hdev->set_bdaddr = btbcm_set_bdaddr;
 429                 btbcm_check_bdaddr(hdev);
 430                 break;
 431 #endif
 432         }
 433
 434 done:
 435         kfree_skb(skb);
 436         return 0;
 437 }
 438
 439 /* ------ LDISC part ------ */
 440 /* hci_uart_tty_open
 441  *
 442  *     Called when line discipline changed to HCI_UART.
 443  *
 444  * Arguments:
 445  *     tty    pointer to tty info structure
 446  * Return Value:
 447  *     0 if success, otherwise error code
 448  */
 449 static int hci_uart_tty_open(struct tty_struct *tty)
 450 {
 451         struct hci_uart *hu;
 452
 453         BT_DBG("tty %p", tty);
 454
 455         /* Error if the tty has no write op instead of leaving an exploitable
 456            hole */
 457         if (tty->ops->write == NULL)
 458                 return -EOPNOTSUPP;
 459
 460         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 461         if (!hu) {
 462                 BT_ERR("Can't allocate control structure");
 463                 return -ENFILE;
 464         }
 465
 466         tty->disc_data = hu;
 467         hu->tty = tty;
 468         tty->receive_room = 65536;
 469
 470         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 471         INIT_WORK(&hu->write_work, hci_uart_write_work);
 472
 473         spin_lock_init(&hu->rx_lock);
 474
 475         /* Flush any pending characters in the driver and line discipline. */
 476
 477         /* FIXME: why is this needed. Note don't use ldisc_ref here as the
 478            open path is before the ldisc is referencable */
 479
 480         if (tty->ldisc->ops->flush_buffer)
 481                 tty->ldisc->ops->flush_buffer(tty);
 482         tty_driver_flush_buffer(tty);
 483
 484         return 0;
 485 }
 486
 487 /* hci_uart_tty_close()
 488  *
 489  *    Called when the line discipline is changed to something
 490  *    else, the tty is closed, or the tty detects a hangup.
 491  */
 492 static void hci_uart_tty_close(struct tty_struct *tty)
 493 {
 494         struct hci_uart *hu = tty->disc_data;
 495         struct hci_dev *hdev;
 496
 497         BT_DBG("tty %p", tty);
 498
 499         /* Detach from the tty */
 500         tty->disc_data = NULL;
 501
 502         if (!hu)
 503                 return;
 504
 505         hdev = hu->hdev;
 506         if (hdev)
 507                 hci_uart_close(hdev);
 508
 509         cancel_work_sync(&hu->write_work);
 510
 511         if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 512                 if (hdev) {
 513                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 514                                 hci_unregister_dev(hdev);
 515                         hci_free_dev(hdev);
 516                 }
 517                 hu->proto->close(hu);
 518         }
 519
 520         kfree(hu);
 521 }
 522
 523 /* hci_uart_tty_wakeup()
 524  *
 525  *    Callback for transmit wakeup. Called when low level
 526  *    device driver can accept more send data.
 527  *
 528  * Arguments:        tty    pointer to associated tty instance data
 529  * Return Value:    None
 530  */
 531 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 532 {
 533         struct hci_uart *hu = tty->disc_data;
 534
 535         BT_DBG("");
 536
 537         if (!hu)
 538                 return;
 539
 540         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 541
 542         if (tty != hu->tty)
 543                 return;
 544
 545         if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 546                 hci_uart_tx_wakeup(hu);
 547 }
 548
 549 /* hci_uart_tty_receive()
 550  *
 551  *     Called by tty low level driver when receive data is
 552  *     available.
 553  *
 554  * Arguments:  tty          pointer to tty isntance data
 555  *             data         pointer to received data
 556  *             flags        pointer to flags for data
 557  *             count        count of received data in bytes
 558  *
 559  * Return Value:    None
 560  */
 561 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 562                                  char *flags, int count)
 563 {
 564         struct hci_uart *hu = tty->disc_data;
 565
 566         if (!hu || tty != hu->tty)
 567                 return;
 568
 569         if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
 570                 return;
 571
 572         spin_lock(&hu->rx_lock);
 573         hu->proto->recv(hu, data, count);
 574
 575         if (hu->hdev)
 576                 hu->hdev->stat.byte_rx += count;
 577
 578         spin_unlock(&hu->rx_lock);
 579
 580         tty_unthrottle(tty);
 581 }
 582
 583 static int hci_uart_register_dev(struct hci_uart *hu)
 584 {
 585         struct hci_dev *hdev;
 586
 587         BT_DBG("");
 588
 589         /* Initialize and register HCI device */
 590         hdev = hci_alloc_dev();
 591         if (!hdev) {
 592                 BT_ERR("Can't allocate HCI device");
 593                 return -ENOMEM;
 594         }
 595
 596         hu->hdev = hdev;
 597
 598         hdev->bus = HCI_UART;
 599         hci_set_drvdata(hdev, hu);
 600
 601         hdev->open  = hci_uart_open;
 602         hdev->close = hci_uart_close;
 603         hdev->flush = hci_uart_flush;
 604         hdev->send  = hci_uart_send_frame;
 605         hdev->setup = hci_uart_setup;
 606         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 607
 608         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 609                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 610
 611         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 612                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 613
 614         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 615                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 616
 617         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 618                 hdev->dev_type = HCI_AMP;
 619         else
 620                 hdev->dev_type = HCI_BREDR;
 621
 622         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 623                 return 0;
 624
 625         if (hci_register_dev(hdev) < 0) {
 626                 BT_ERR("Can't register HCI device");
 627                 hci_free_dev(hdev);
 628                 return -ENODEV;
 629         }
 630
 631         set_bit(HCI_UART_REGISTERED, &hu->flags);
 632
 633         return 0;
 634 }
 635
 636 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 637 {
 638         const struct hci_uart_proto *p;
 639         int err;
 640
 641         p = hci_uart_get_proto(id);
 642         if (!p)
 643                 return -EPROTONOSUPPORT;
 644
 645         err = p->open(hu);
 646         if (err)
 647                 return err;
 648
 649         hu->proto = p;
 650
 651         err = hci_uart_register_dev(hu);
 652         if (err) {
 653                 p->close(hu);
 654                 return err;
 655         }
 656
 657         return 0;
 658 }
 659
 660 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 661 {
 662         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 663                                     BIT(HCI_UART_RESET_ON_INIT) |
 664                                     BIT(HCI_UART_CREATE_AMP) |
 665                                     BIT(HCI_UART_INIT_PENDING) |
 666                                     BIT(HCI_UART_EXT_CONFIG) |
 667                                     BIT(HCI_UART_VND_DETECT);
 668
 669         if (flags & ~valid_flags)
 670                 return -EINVAL;
 671
 672         hu->hdev_flags = flags;
 673
 674         return 0;
 675 }
 676
 677 /* hci_uart_tty_ioctl()
 678  *
 679  *    Process IOCTL system call for the tty device.
 680  *
 681  * Arguments:
 682  *
 683  *    tty        pointer to tty instance data
 684  *    file       pointer to open file object for device
 685  *    cmd        IOCTL command code
 686  *    arg        argument for IOCTL call (cmd dependent)
 687  *
 688  * Return Value:    Command dependent
 689  */
 690 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 691                               unsigned int cmd, unsigned long arg)
 692 {
 693         struct hci_uart *hu = tty->disc_data;
 694         int err = 0;
 695
 696         BT_DBG("");
 697
 698         /* Verify the status of the device */
 699         if (!hu)
 700                 return -EBADF;
 701
 702         switch (cmd) {
 703         case HCIUARTSETPROTO:
 704                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 705                         err = hci_uart_set_proto(hu, arg);
 706                         if (err) {
 707                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 708                                 return err;
 709                         }
 710                 } else
 711                         return -EBUSY;
 712                 break;
 713
 714         case HCIUARTGETPROTO:
 715                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 716                         return hu->proto->id;
 717                 return -EUNATCH;
 718
 719         case HCIUARTGETDEVICE:
 720                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 721                         return hu->hdev->id;
 722                 return -EUNATCH;
 723
 724         case HCIUARTSETFLAGS:
 725                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 726                         return -EBUSY;
 727                 err = hci_uart_set_flags(hu, arg);
 728                 if (err)
 729                         return err;
 730                 break;
 731
 732         case HCIUARTGETFLAGS:
 733                 return hu->hdev_flags;
 734
 735         default:
 736                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 737                 break;
 738         }
 739
 740         return err;
 741 }
 742
 743 /*
 744  * We don't provide read/write/poll interface for user space.
 745  */
 746 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 747                                  unsigned char __user *buf, size_t nr)
 748 {
 749         return 0;
 750 }
 751
 752 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 753                                   const unsigned char *data, size_t count)
 754 {
 755         return 0;
 756 }
 757
 758 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 759                                       struct file *filp, poll_table *wait)
 760 {
 761         return 0;
 762 }
 763
 764 static int __init hci_uart_init(void)
 765 {
 766         static struct tty_ldisc_ops hci_uart_ldisc;
 767         int err;
 768
 769         BT_INFO("HCI UART driver ver %s", VERSION);
 770
 771         /* Register the tty discipline */
 772
 773         memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
 774         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 775         hci_uart_ldisc.name             = "n_hci";
 776         hci_uart_ldisc.open             = hci_uart_tty_open;
 777         hci_uart_ldisc.close            = hci_uart_tty_close;
 778         hci_uart_ldisc.read             = hci_uart_tty_read;
 779         hci_uart_ldisc.write            = hci_uart_tty_write;
 780         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 781         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 782         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 783         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 784         hci_uart_ldisc.owner            = THIS_MODULE;
 785
 786         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 787         if (err) {
 788                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 789                 return err;
 790         }
 791
 792 #ifdef CONFIG_BT_HCIUART_H4
 793         h4_init();
 794 #endif
 795 #ifdef CONFIG_BT_HCIUART_BCSP
 796         bcsp_init();
 797 #endif
 798 #ifdef CONFIG_BT_HCIUART_LL
 799         ll_init();
 800 #endif
 801 #ifdef CONFIG_BT_HCIUART_ATH3K
 802         ath_init();
 803 #endif
 804 #ifdef CONFIG_BT_HCIUART_3WIRE
 805         h5_init();
 806 #endif
 807 #ifdef CONFIG_BT_HCIUART_BCM
 808         bcm_init();
 809 #endif
 810
 811         return 0;
 812 }
 813
 814 static void __exit hci_uart_exit(void)
 815 {
 816         int err;
 817
 818 #ifdef CONFIG_BT_HCIUART_H4
 819         h4_deinit();
 820 #endif
 821 #ifdef CONFIG_BT_HCIUART_BCSP
 822         bcsp_deinit();
 823 #endif
 824 #ifdef CONFIG_BT_HCIUART_LL
 825         ll_deinit();
 826 #endif
 827 #ifdef CONFIG_BT_HCIUART_ATH3K
 828         ath_deinit();
 829 #endif
 830 #ifdef CONFIG_BT_HCIUART_3WIRE
 831         h5_deinit();
 832 #endif
 833 #ifdef CONFIG_BT_HCIUART_BCM
 834         bcm_deinit();
 835 #endif
 836
 837         /* Release tty registration of line discipline */
 838         err = tty_unregister_ldisc(N_HCI);
 839         if (err)
 840                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 841 }
 842
 843 module_init(hci_uart_init);
 844 module_exit(hci_uart_exit);
 845
 846 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 847 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 848 MODULE_VERSION(VERSION);
 849 MODULE_LICENSE("GPL");
 850 MODULE_ALIAS_LDISC(N_HCI);