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, hci_skb_pkt_type(skb));
 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         return 0;
 212 }
 213
 214 /* Reset device */
 215 static int hci_uart_flush(struct hci_dev *hdev)
 216 {
 217         struct hci_uart *hu  = hci_get_drvdata(hdev);
 218         struct tty_struct *tty = hu->tty;
 219
 220         BT_DBG("hdev %p tty %p", hdev, tty);
 221
 222         if (hu->tx_skb) {
 223                 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
 224         }
 225
 226         /* Flush any pending characters in the driver and discipline. */
 227         tty_ldisc_flush(tty);
 228         tty_driver_flush_buffer(tty);
 229
 230         if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 231                 hu->proto->flush(hu);
 232
 233         return 0;
 234 }
 235
 236 /* Close device */
 237 static int hci_uart_close(struct hci_dev *hdev)
 238 {
 239         BT_DBG("hdev %p", hdev);
 240
 241         hci_uart_flush(hdev);
 242         hdev->flush = NULL;
 243         return 0;
 244 }
 245
 246 /* Send frames from HCI layer */
 247 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 248 {
 249         struct hci_uart *hu = hci_get_drvdata(hdev);
 250
 251         BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
 252                skb->len);
 253
 254         hu->proto->enqueue(hu, skb);
 255
 256         hci_uart_tx_wakeup(hu);
 257
 258         return 0;
 259 }
 260
 261 /* Flow control or un-flow control the device */
 262 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 263 {
 264         struct tty_struct *tty = hu->tty;
 265         struct ktermios ktermios;
 266         int status;
 267         unsigned int set = 0;
 268         unsigned int clear = 0;
 269
 270         if (enable) {
 271                 /* Disable hardware flow control */
 272                 ktermios = tty->termios;
 273                 ktermios.c_cflag &= ~CRTSCTS;
 274                 status = tty_set_termios(tty, &ktermios);
 275                 BT_DBG("Disabling hardware flow control: %s",
 276                        status ? "failed" : "success");
 277
 278                 /* Clear RTS to prevent the device from sending */
 279                 /* Most UARTs need OUT2 to enable interrupts */
 280                 status = tty->driver->ops->tiocmget(tty);
 281                 BT_DBG("Current tiocm 0x%x", status);
 282
 283                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 284                 clear = ~set;
 285                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 286                        TIOCM_OUT2 | TIOCM_LOOP;
 287                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 288                          TIOCM_OUT2 | TIOCM_LOOP;
 289                 status = tty->driver->ops->tiocmset(tty, set, clear);
 290                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 291         } else {
 292                 /* Set RTS to allow the device to send again */
 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("Setting RTS: %s", status ? "failed" : "success");
 304
 305                 /* Re-enable hardware flow control */
 306                 ktermios = tty->termios;
 307                 ktermios.c_cflag |= CRTSCTS;
 308                 status = tty_set_termios(tty, &ktermios);
 309                 BT_DBG("Enabling hardware flow control: %s",
 310                        status ? "failed" : "success");
 311         }
 312 }
 313
 314 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 315                          unsigned int oper_speed)
 316 {
 317         hu->init_speed = init_speed;
 318         hu->oper_speed = oper_speed;
 319 }
 320
 321 void hci_uart_init_tty(struct hci_uart *hu)
 322 {
 323         struct tty_struct *tty = hu->tty;
 324         struct ktermios ktermios;
 325
 326         /* Bring the UART into a known 8 bits no parity hw fc state */
 327         ktermios = tty->termios;
 328         ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
 329                               INLCR | IGNCR | ICRNL | IXON);
 330         ktermios.c_oflag &= ~OPOST;
 331         ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 332         ktermios.c_cflag &= ~(CSIZE | PARENB);
 333         ktermios.c_cflag |= CS8;
 334         ktermios.c_cflag |= CRTSCTS;
 335
 336         /* tty_set_termios() return not checked as it is always 0 */
 337         tty_set_termios(tty, &ktermios);
 338 }
 339
 340 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 341 {
 342         struct tty_struct *tty = hu->tty;
 343         struct ktermios ktermios;
 344
 345         ktermios = tty->termios;
 346         ktermios.c_cflag &= ~CBAUD;
 347         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 348
 349         /* tty_set_termios() return not checked as it is always 0 */
 350         tty_set_termios(tty, &ktermios);
 351
 352         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 353                tty->termios.c_ispeed, tty->termios.c_ospeed);
 354 }
 355
 356 static int hci_uart_setup(struct hci_dev *hdev)
 357 {
 358         struct hci_uart *hu = hci_get_drvdata(hdev);
 359         struct hci_rp_read_local_version *ver;
 360         struct sk_buff *skb;
 361         unsigned int speed;
 362         int err;
 363
 364         /* Init speed if any */
 365         if (hu->init_speed)
 366                 speed = hu->init_speed;
 367         else if (hu->proto->init_speed)
 368                 speed = hu->proto->init_speed;
 369         else
 370                 speed = 0;
 371
 372         if (speed)
 373                 hci_uart_set_baudrate(hu, speed);
 374
 375         /* Operational speed if any */
 376         if (hu->oper_speed)
 377                 speed = hu->oper_speed;
 378         else if (hu->proto->oper_speed)
 379                 speed = hu->proto->oper_speed;
 380         else
 381                 speed = 0;
 382
 383         if (hu->proto->set_baudrate && speed) {
 384                 err = hu->proto->set_baudrate(hu, speed);
 385                 if (!err)
 386                         hci_uart_set_baudrate(hu, speed);
 387         }
 388
 389         if (hu->proto->setup)
 390                 return hu->proto->setup(hu);
 391
 392         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 393                 return 0;
 394
 395         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 396                              HCI_INIT_TIMEOUT);
 397         if (IS_ERR(skb)) {
 398                 BT_ERR("%s: Reading local version information failed (%ld)",
 399                        hdev->name, PTR_ERR(skb));
 400                 return 0;
 401         }
 402
 403         if (skb->len != sizeof(*ver)) {
 404                 BT_ERR("%s: Event length mismatch for version information",
 405                        hdev->name);
 406                 goto done;
 407         }
 408
 409         ver = (struct hci_rp_read_local_version *)skb->data;
 410
 411         switch (le16_to_cpu(ver->manufacturer)) {
 412 #ifdef CONFIG_BT_HCIUART_INTEL
 413         case 2:
 414                 hdev->set_bdaddr = btintel_set_bdaddr;
 415                 btintel_check_bdaddr(hdev);
 416                 break;
 417 #endif
 418 #ifdef CONFIG_BT_HCIUART_BCM
 419         case 15:
 420                 hdev->set_bdaddr = btbcm_set_bdaddr;
 421                 btbcm_check_bdaddr(hdev);
 422                 break;
 423 #endif
 424         }
 425
 426 done:
 427         kfree_skb(skb);
 428         return 0;
 429 }
 430
 431 /* ------ LDISC part ------ */
 432 /* hci_uart_tty_open
 433  *
 434  *     Called when line discipline changed to HCI_UART.
 435  *
 436  * Arguments:
 437  *     tty    pointer to tty info structure
 438  * Return Value:
 439  *     0 if success, otherwise error code
 440  */
 441 static int hci_uart_tty_open(struct tty_struct *tty)
 442 {
 443         struct hci_uart *hu;
 444
 445         BT_DBG("tty %p", tty);
 446
 447         /* Error if the tty has no write op instead of leaving an exploitable
 448            hole */
 449         if (tty->ops->write == NULL)
 450                 return -EOPNOTSUPP;
 451
 452         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 453         if (!hu) {
 454                 BT_ERR("Can't allocate control structure");
 455                 return -ENFILE;
 456         }
 457
 458         tty->disc_data = hu;
 459         hu->tty = tty;
 460         tty->receive_room = 65536;
 461
 462         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 463         INIT_WORK(&hu->write_work, hci_uart_write_work);
 464
 465         /* Flush any pending characters in the driver and line discipline. */
 466
 467         /* FIXME: why is this needed. Note don't use ldisc_ref here as the
 468            open path is before the ldisc is referencable */
 469
 470         if (tty->ldisc->ops->flush_buffer)
 471                 tty->ldisc->ops->flush_buffer(tty);
 472         tty_driver_flush_buffer(tty);
 473
 474         return 0;
 475 }
 476
 477 /* hci_uart_tty_close()
 478  *
 479  *    Called when the line discipline is changed to something
 480  *    else, the tty is closed, or the tty detects a hangup.
 481  */
 482 static void hci_uart_tty_close(struct tty_struct *tty)
 483 {
 484         struct hci_uart *hu = tty->disc_data;
 485         struct hci_dev *hdev;
 486
 487         BT_DBG("tty %p", tty);
 488
 489         /* Detach from the tty */
 490         tty->disc_data = NULL;
 491
 492         if (!hu)
 493                 return;
 494
 495         hdev = hu->hdev;
 496         if (hdev)
 497                 hci_uart_close(hdev);
 498
 499         cancel_work_sync(&hu->write_work);
 500
 501         if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 502                 if (hdev) {
 503                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 504                                 hci_unregister_dev(hdev);
 505                         hci_free_dev(hdev);
 506                 }
 507                 hu->proto->close(hu);
 508         }
 509
 510         kfree(hu);
 511 }
 512
 513 /* hci_uart_tty_wakeup()
 514  *
 515  *    Callback for transmit wakeup. Called when low level
 516  *    device driver can accept more send data.
 517  *
 518  * Arguments:        tty    pointer to associated tty instance data
 519  * Return Value:    None
 520  */
 521 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 522 {
 523         struct hci_uart *hu = tty->disc_data;
 524
 525         BT_DBG("");
 526
 527         if (!hu)
 528                 return;
 529
 530         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 531
 532         if (tty != hu->tty)
 533                 return;
 534
 535         if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 536                 hci_uart_tx_wakeup(hu);
 537 }
 538
 539 /* hci_uart_tty_receive()
 540  *
 541  *     Called by tty low level driver when receive data is
 542  *     available.
 543  *
 544  * Arguments:  tty          pointer to tty isntance data
 545  *             data         pointer to received data
 546  *             flags        pointer to flags for data
 547  *             count        count of received data in bytes
 548  *
 549  * Return Value:    None
 550  */
 551 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 552                                  char *flags, int count)
 553 {
 554         struct hci_uart *hu = tty->disc_data;
 555
 556         if (!hu || tty != hu->tty)
 557                 return;
 558
 559         if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
 560                 return;
 561
 562         /* It does not need a lock here as it is already protected by a mutex in
 563          * tty caller
 564          */
 565         hu->proto->recv(hu, data, count);
 566
 567         if (hu->hdev)
 568                 hu->hdev->stat.byte_rx += count;
 569
 570         tty_unthrottle(tty);
 571 }
 572
 573 static int hci_uart_register_dev(struct hci_uart *hu)
 574 {
 575         struct hci_dev *hdev;
 576
 577         BT_DBG("");
 578
 579         /* Initialize and register HCI device */
 580         hdev = hci_alloc_dev();
 581         if (!hdev) {
 582                 BT_ERR("Can't allocate HCI device");
 583                 return -ENOMEM;
 584         }
 585
 586         hu->hdev = hdev;
 587
 588         hdev->bus = HCI_UART;
 589         hci_set_drvdata(hdev, hu);
 590
 591         /* Only when vendor specific setup callback is provided, consider
 592          * the manufacturer information valid. This avoids filling in the
 593          * value for Ericsson when nothing is specified.
 594          */
 595         if (hu->proto->setup)
 596                 hdev->manufacturer = hu->proto->manufacturer;
 597
 598         hdev->open  = hci_uart_open;
 599         hdev->close = hci_uart_close;
 600         hdev->flush = hci_uart_flush;
 601         hdev->send  = hci_uart_send_frame;
 602         hdev->setup = hci_uart_setup;
 603         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 604
 605         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 606                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 607
 608         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 609                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 610
 611         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 612                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 613
 614         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 615                 hdev->dev_type = HCI_AMP;
 616         else
 617                 hdev->dev_type = HCI_BREDR;
 618
 619         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 620                 return 0;
 621
 622         if (hci_register_dev(hdev) < 0) {
 623                 BT_ERR("Can't register HCI device");
 624                 hci_free_dev(hdev);
 625                 return -ENODEV;
 626         }
 627
 628         set_bit(HCI_UART_REGISTERED, &hu->flags);
 629
 630         return 0;
 631 }
 632
 633 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 634 {
 635         const struct hci_uart_proto *p;
 636         int err;
 637
 638         p = hci_uart_get_proto(id);
 639         if (!p)
 640                 return -EPROTONOSUPPORT;
 641
 642         err = p->open(hu);
 643         if (err)
 644                 return err;
 645
 646         hu->proto = p;
 647
 648         err = hci_uart_register_dev(hu);
 649         if (err) {
 650                 p->close(hu);
 651                 return err;
 652         }
 653
 654         return 0;
 655 }
 656
 657 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 658 {
 659         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 660                                     BIT(HCI_UART_RESET_ON_INIT) |
 661                                     BIT(HCI_UART_CREATE_AMP) |
 662                                     BIT(HCI_UART_INIT_PENDING) |
 663                                     BIT(HCI_UART_EXT_CONFIG) |
 664                                     BIT(HCI_UART_VND_DETECT);
 665
 666         if (flags & ~valid_flags)
 667                 return -EINVAL;
 668
 669         hu->hdev_flags = flags;
 670
 671         return 0;
 672 }
 673
 674 /* hci_uart_tty_ioctl()
 675  *
 676  *    Process IOCTL system call for the tty device.
 677  *
 678  * Arguments:
 679  *
 680  *    tty        pointer to tty instance data
 681  *    file       pointer to open file object for device
 682  *    cmd        IOCTL command code
 683  *    arg        argument for IOCTL call (cmd dependent)
 684  *
 685  * Return Value:    Command dependent
 686  */
 687 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 688                               unsigned int cmd, unsigned long arg)
 689 {
 690         struct hci_uart *hu = tty->disc_data;
 691         int err = 0;
 692
 693         BT_DBG("");
 694
 695         /* Verify the status of the device */
 696         if (!hu)
 697                 return -EBADF;
 698
 699         switch (cmd) {
 700         case HCIUARTSETPROTO:
 701                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 702                         err = hci_uart_set_proto(hu, arg);
 703                         if (err) {
 704                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 705                                 return err;
 706                         }
 707                 } else
 708                         return -EBUSY;
 709                 break;
 710
 711         case HCIUARTGETPROTO:
 712                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 713                         return hu->proto->id;
 714                 return -EUNATCH;
 715
 716         case HCIUARTGETDEVICE:
 717                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 718                         return hu->hdev->id;
 719                 return -EUNATCH;
 720
 721         case HCIUARTSETFLAGS:
 722                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 723                         return -EBUSY;
 724                 err = hci_uart_set_flags(hu, arg);
 725                 if (err)
 726                         return err;
 727                 break;
 728
 729         case HCIUARTGETFLAGS:
 730                 return hu->hdev_flags;
 731
 732         default:
 733                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 734                 break;
 735         }
 736
 737         return err;
 738 }
 739
 740 /*
 741  * We don't provide read/write/poll interface for user space.
 742  */
 743 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 744                                  unsigned char __user *buf, size_t nr)
 745 {
 746         return 0;
 747 }
 748
 749 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 750                                   const unsigned char *data, size_t count)
 751 {
 752         return 0;
 753 }
 754
 755 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 756                                       struct file *filp, poll_table *wait)
 757 {
 758         return 0;
 759 }
 760
 761 static int __init hci_uart_init(void)
 762 {
 763         static struct tty_ldisc_ops hci_uart_ldisc;
 764         int err;
 765
 766         BT_INFO("HCI UART driver ver %s", VERSION);
 767
 768         /* Register the tty discipline */
 769
 770         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 771         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 772         hci_uart_ldisc.name             = "n_hci";
 773         hci_uart_ldisc.open             = hci_uart_tty_open;
 774         hci_uart_ldisc.close            = hci_uart_tty_close;
 775         hci_uart_ldisc.read             = hci_uart_tty_read;
 776         hci_uart_ldisc.write            = hci_uart_tty_write;
 777         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 778         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 779         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 780         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 781         hci_uart_ldisc.owner            = THIS_MODULE;
 782
 783         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 784         if (err) {
 785                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 786                 return err;
 787         }
 788
 789 #ifdef CONFIG_BT_HCIUART_H4
 790         h4_init();
 791 #endif
 792 #ifdef CONFIG_BT_HCIUART_BCSP
 793         bcsp_init();
 794 #endif
 795 #ifdef CONFIG_BT_HCIUART_LL
 796         ll_init();
 797 #endif
 798 #ifdef CONFIG_BT_HCIUART_ATH3K
 799         ath_init();
 800 #endif
 801 #ifdef CONFIG_BT_HCIUART_3WIRE
 802         h5_init();
 803 #endif
 804 #ifdef CONFIG_BT_HCIUART_INTEL
 805         intel_init();
 806 #endif
 807 #ifdef CONFIG_BT_HCIUART_BCM
 808         bcm_init();
 809 #endif
 810 #ifdef CONFIG_BT_HCIUART_QCA
 811         qca_init();
 812 #endif
 813
 814         return 0;
 815 }
 816
 817 static void __exit hci_uart_exit(void)
 818 {
 819         int err;
 820
 821 #ifdef CONFIG_BT_HCIUART_H4
 822         h4_deinit();
 823 #endif
 824 #ifdef CONFIG_BT_HCIUART_BCSP
 825         bcsp_deinit();
 826 #endif
 827 #ifdef CONFIG_BT_HCIUART_LL
 828         ll_deinit();
 829 #endif
 830 #ifdef CONFIG_BT_HCIUART_ATH3K
 831         ath_deinit();
 832 #endif
 833 #ifdef CONFIG_BT_HCIUART_3WIRE
 834         h5_deinit();
 835 #endif
 836 #ifdef CONFIG_BT_HCIUART_INTEL
 837         intel_deinit();
 838 #endif
 839 #ifdef CONFIG_BT_HCIUART_BCM
 840         bcm_deinit();
 841 #endif
 842 #ifdef CONFIG_BT_HCIUART_QCA
 843         qca_deinit();
 844 #endif
 845
 846         /* Release tty registration of line discipline */
 847         err = tty_unregister_ldisc(N_HCI);
 848         if (err)
 849                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 850 }
 851
 852 module_init(hci_uart_init);
 853 module_exit(hci_uart_exit);
 854
 855 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 856 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 857 MODULE_VERSION(VERSION);
 858 MODULE_LICENSE("GPL");
 859 MODULE_ALIAS_LDISC(N_HCI);