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         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, bt_cb(skb)->pkt_type, skb->len);
 252
 253         hu->proto->enqueue(hu, skb);
 254
 255         hci_uart_tx_wakeup(hu);
 256
 257         return 0;
 258 }
 259
 260 /* Flow control or un-flow control the device */
 261 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 262 {
 263         struct tty_struct *tty = hu->tty;
 264         struct ktermios ktermios;
 265         int status;
 266         unsigned int set = 0;
 267         unsigned int clear = 0;
 268
 269         if (enable) {
 270                 /* Disable hardware flow control */
 271                 ktermios = tty->termios;
 272                 ktermios.c_cflag &= ~CRTSCTS;
 273                 status = tty_set_termios(tty, &ktermios);
 274                 BT_DBG("Disabling hardware flow control: %s",
 275                        status ? "failed" : "success");
 276
 277                 /* Clear RTS to prevent the device from sending */
 278                 /* Most UARTs need OUT2 to enable interrupts */
 279                 status = tty->driver->ops->tiocmget(tty);
 280                 BT_DBG("Current tiocm 0x%x", status);
 281
 282                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 283                 clear = ~set;
 284                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 285                        TIOCM_OUT2 | TIOCM_LOOP;
 286                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 287                          TIOCM_OUT2 | TIOCM_LOOP;
 288                 status = tty->driver->ops->tiocmset(tty, set, clear);
 289                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 290         } else {
 291                 /* Set RTS to allow the device to send again */
 292                 status = tty->driver->ops->tiocmget(tty);
 293                 BT_DBG("Current tiocm 0x%x", status);
 294
 295                 set |= (TIOCM_OUT2 | TIOCM_RTS);
 296                 clear = ~set;
 297                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 298                        TIOCM_OUT2 | TIOCM_LOOP;
 299                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 300                          TIOCM_OUT2 | TIOCM_LOOP;
 301                 status = tty->driver->ops->tiocmset(tty, set, clear);
 302                 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
 303
 304                 /* Re-enable hardware flow control */
 305                 ktermios = tty->termios;
 306                 ktermios.c_cflag |= CRTSCTS;
 307                 status = tty_set_termios(tty, &ktermios);
 308                 BT_DBG("Enabling hardware flow control: %s",
 309                        status ? "failed" : "success");
 310         }
 311 }
 312
 313 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 314                          unsigned int oper_speed)
 315 {
 316         hu->init_speed = init_speed;
 317         hu->oper_speed = oper_speed;
 318 }
 319
 320 void hci_uart_init_tty(struct hci_uart *hu)
 321 {
 322         struct tty_struct *tty = hu->tty;
 323         struct ktermios ktermios;
 324
 325         /* Bring the UART into a known 8 bits no parity hw fc state */
 326         ktermios = tty->termios;
 327         ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
 328                               INLCR | IGNCR | ICRNL | IXON);
 329         ktermios.c_oflag &= ~OPOST;
 330         ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 331         ktermios.c_cflag &= ~(CSIZE | PARENB);
 332         ktermios.c_cflag |= CS8;
 333         ktermios.c_cflag |= CRTSCTS;
 334
 335         /* tty_set_termios() return not checked as it is always 0 */
 336         tty_set_termios(tty, &ktermios);
 337 }
 338
 339 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 340 {
 341         struct tty_struct *tty = hu->tty;
 342         struct ktermios ktermios;
 343
 344         ktermios = tty->termios;
 345         ktermios.c_cflag &= ~CBAUD;
 346         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 347
 348         /* tty_set_termios() return not checked as it is always 0 */
 349         tty_set_termios(tty, &ktermios);
 350
 351         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 352                tty->termios.c_ispeed, tty->termios.c_ospeed);
 353 }
 354
 355 static int hci_uart_setup(struct hci_dev *hdev)
 356 {
 357         struct hci_uart *hu = hci_get_drvdata(hdev);
 358         struct hci_rp_read_local_version *ver;
 359         struct sk_buff *skb;
 360         unsigned int speed;
 361         int err;
 362
 363         /* Init speed if any */
 364         if (hu->init_speed)
 365                 speed = hu->init_speed;
 366         else if (hu->proto->init_speed)
 367                 speed = hu->proto->init_speed;
 368         else
 369                 speed = 0;
 370
 371         if (speed)
 372                 hci_uart_set_baudrate(hu, speed);
 373
 374         /* Operational speed if any */
 375         if (hu->oper_speed)
 376                 speed = hu->oper_speed;
 377         else if (hu->proto->oper_speed)
 378                 speed = hu->proto->oper_speed;
 379         else
 380                 speed = 0;
 381
 382         if (hu->proto->set_baudrate && speed) {
 383                 err = hu->proto->set_baudrate(hu, speed);
 384                 if (!err)
 385                         hci_uart_set_baudrate(hu, speed);
 386         }
 387
 388         if (hu->proto->setup)
 389                 return hu->proto->setup(hu);
 390
 391         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 392                 return 0;
 393
 394         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 395                              HCI_INIT_TIMEOUT);
 396         if (IS_ERR(skb)) {
 397                 BT_ERR("%s: Reading local version information failed (%ld)",
 398                        hdev->name, PTR_ERR(skb));
 399                 return 0;
 400         }
 401
 402         if (skb->len != sizeof(*ver)) {
 403                 BT_ERR("%s: Event length mismatch for version information",
 404                        hdev->name);
 405                 goto done;
 406         }
 407
 408         ver = (struct hci_rp_read_local_version *)skb->data;
 409
 410         switch (le16_to_cpu(ver->manufacturer)) {
 411 #ifdef CONFIG_BT_HCIUART_INTEL
 412         case 2:
 413                 hdev->set_bdaddr = btintel_set_bdaddr;
 414                 btintel_check_bdaddr(hdev);
 415                 break;
 416 #endif
 417 #ifdef CONFIG_BT_HCIUART_BCM
 418         case 15:
 419                 hdev->set_bdaddr = btbcm_set_bdaddr;
 420                 btbcm_check_bdaddr(hdev);
 421                 break;
 422 #endif
 423         }
 424
 425 done:
 426         kfree_skb(skb);
 427         return 0;
 428 }
 429
 430 /* ------ LDISC part ------ */
 431 /* hci_uart_tty_open
 432  *
 433  *     Called when line discipline changed to HCI_UART.
 434  *
 435  * Arguments:
 436  *     tty    pointer to tty info structure
 437  * Return Value:
 438  *     0 if success, otherwise error code
 439  */
 440 static int hci_uart_tty_open(struct tty_struct *tty)
 441 {
 442         struct hci_uart *hu;
 443
 444         BT_DBG("tty %p", tty);
 445
 446         /* Error if the tty has no write op instead of leaving an exploitable
 447            hole */
 448         if (tty->ops->write == NULL)
 449                 return -EOPNOTSUPP;
 450
 451         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 452         if (!hu) {
 453                 BT_ERR("Can't allocate control structure");
 454                 return -ENFILE;
 455         }
 456
 457         tty->disc_data = hu;
 458         hu->tty = tty;
 459         tty->receive_room = 65536;
 460
 461         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 462         INIT_WORK(&hu->write_work, hci_uart_write_work);
 463
 464         /* Flush any pending characters in the driver and line discipline. */
 465
 466         /* FIXME: why is this needed. Note don't use ldisc_ref here as the
 467            open path is before the ldisc is referencable */
 468
 469         if (tty->ldisc->ops->flush_buffer)
 470                 tty->ldisc->ops->flush_buffer(tty);
 471         tty_driver_flush_buffer(tty);
 472
 473         return 0;
 474 }
 475
 476 /* hci_uart_tty_close()
 477  *
 478  *    Called when the line discipline is changed to something
 479  *    else, the tty is closed, or the tty detects a hangup.
 480  */
 481 static void hci_uart_tty_close(struct tty_struct *tty)
 482 {
 483         struct hci_uart *hu = tty->disc_data;
 484         struct hci_dev *hdev;
 485
 486         BT_DBG("tty %p", tty);
 487
 488         /* Detach from the tty */
 489         tty->disc_data = NULL;
 490
 491         if (!hu)
 492                 return;
 493
 494         hdev = hu->hdev;
 495         if (hdev)
 496                 hci_uart_close(hdev);
 497
 498         cancel_work_sync(&hu->write_work);
 499
 500         if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 501                 if (hdev) {
 502                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 503                                 hci_unregister_dev(hdev);
 504                         hci_free_dev(hdev);
 505                 }
 506                 hu->proto->close(hu);
 507         }
 508
 509         kfree(hu);
 510 }
 511
 512 /* hci_uart_tty_wakeup()
 513  *
 514  *    Callback for transmit wakeup. Called when low level
 515  *    device driver can accept more send data.
 516  *
 517  * Arguments:        tty    pointer to associated tty instance data
 518  * Return Value:    None
 519  */
 520 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 521 {
 522         struct hci_uart *hu = tty->disc_data;
 523
 524         BT_DBG("");
 525
 526         if (!hu)
 527                 return;
 528
 529         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 530
 531         if (tty != hu->tty)
 532                 return;
 533
 534         if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 535                 hci_uart_tx_wakeup(hu);
 536 }
 537
 538 /* hci_uart_tty_receive()
 539  *
 540  *     Called by tty low level driver when receive data is
 541  *     available.
 542  *
 543  * Arguments:  tty          pointer to tty isntance data
 544  *             data         pointer to received data
 545  *             flags        pointer to flags for data
 546  *             count        count of received data in bytes
 547  *
 548  * Return Value:    None
 549  */
 550 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 551                                  char *flags, int count)
 552 {
 553         struct hci_uart *hu = tty->disc_data;
 554
 555         if (!hu || tty != hu->tty)
 556                 return;
 557
 558         if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
 559                 return;
 560
 561         /* It does not need a lock here as it is already protected by a mutex in
 562          * tty caller
 563          */
 564         hu->proto->recv(hu, data, count);
 565
 566         if (hu->hdev)
 567                 hu->hdev->stat.byte_rx += count;
 568
 569         tty_unthrottle(tty);
 570 }
 571
 572 static int hci_uart_register_dev(struct hci_uart *hu)
 573 {
 574         struct hci_dev *hdev;
 575
 576         BT_DBG("");
 577
 578         /* Initialize and register HCI device */
 579         hdev = hci_alloc_dev();
 580         if (!hdev) {
 581                 BT_ERR("Can't allocate HCI device");
 582                 return -ENOMEM;
 583         }
 584
 585         hu->hdev = hdev;
 586
 587         hdev->bus = HCI_UART;
 588         hci_set_drvdata(hdev, hu);
 589
 590         /* Only when vendor specific setup callback is provided, consider
 591          * the manufacturer information valid. This avoids filling in the
 592          * value for Ericsson when nothing is specified.
 593          */
 594         if (hu->proto->setup)
 595                 hdev->manufacturer = hu->proto->manufacturer;
 596
 597         hdev->open  = hci_uart_open;
 598         hdev->close = hci_uart_close;
 599         hdev->flush = hci_uart_flush;
 600         hdev->send  = hci_uart_send_frame;
 601         hdev->setup = hci_uart_setup;
 602         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 603
 604         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 605                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 606
 607         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 608                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 609
 610         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 611                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 612
 613         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 614                 hdev->dev_type = HCI_AMP;
 615         else
 616                 hdev->dev_type = HCI_BREDR;
 617
 618         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 619                 return 0;
 620
 621         if (hci_register_dev(hdev) < 0) {
 622                 BT_ERR("Can't register HCI device");
 623                 hci_free_dev(hdev);
 624                 return -ENODEV;
 625         }
 626
 627         set_bit(HCI_UART_REGISTERED, &hu->flags);
 628
 629         return 0;
 630 }
 631
 632 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 633 {
 634         const struct hci_uart_proto *p;
 635         int err;
 636
 637         p = hci_uart_get_proto(id);
 638         if (!p)
 639                 return -EPROTONOSUPPORT;
 640
 641         err = p->open(hu);
 642         if (err)
 643                 return err;
 644
 645         hu->proto = p;
 646
 647         err = hci_uart_register_dev(hu);
 648         if (err) {
 649                 p->close(hu);
 650                 return err;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 657 {
 658         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 659                                     BIT(HCI_UART_RESET_ON_INIT) |
 660                                     BIT(HCI_UART_CREATE_AMP) |
 661                                     BIT(HCI_UART_INIT_PENDING) |
 662                                     BIT(HCI_UART_EXT_CONFIG) |
 663                                     BIT(HCI_UART_VND_DETECT);
 664
 665         if (flags & ~valid_flags)
 666                 return -EINVAL;
 667
 668         hu->hdev_flags = flags;
 669
 670         return 0;
 671 }
 672
 673 /* hci_uart_tty_ioctl()
 674  *
 675  *    Process IOCTL system call for the tty device.
 676  *
 677  * Arguments:
 678  *
 679  *    tty        pointer to tty instance data
 680  *    file       pointer to open file object for device
 681  *    cmd        IOCTL command code
 682  *    arg        argument for IOCTL call (cmd dependent)
 683  *
 684  * Return Value:    Command dependent
 685  */
 686 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 687                               unsigned int cmd, unsigned long arg)
 688 {
 689         struct hci_uart *hu = tty->disc_data;
 690         int err = 0;
 691
 692         BT_DBG("");
 693
 694         /* Verify the status of the device */
 695         if (!hu)
 696                 return -EBADF;
 697
 698         switch (cmd) {
 699         case HCIUARTSETPROTO:
 700                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 701                         err = hci_uart_set_proto(hu, arg);
 702                         if (err) {
 703                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 704                                 return err;
 705                         }
 706                 } else
 707                         return -EBUSY;
 708                 break;
 709
 710         case HCIUARTGETPROTO:
 711                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 712                         return hu->proto->id;
 713                 return -EUNATCH;
 714
 715         case HCIUARTGETDEVICE:
 716                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 717                         return hu->hdev->id;
 718                 return -EUNATCH;
 719
 720         case HCIUARTSETFLAGS:
 721                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 722                         return -EBUSY;
 723                 err = hci_uart_set_flags(hu, arg);
 724                 if (err)
 725                         return err;
 726                 break;
 727
 728         case HCIUARTGETFLAGS:
 729                 return hu->hdev_flags;
 730
 731         default:
 732                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 733                 break;
 734         }
 735
 736         return err;
 737 }
 738
 739 /*
 740  * We don't provide read/write/poll interface for user space.
 741  */
 742 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 743                                  unsigned char __user *buf, size_t nr)
 744 {
 745         return 0;
 746 }
 747
 748 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 749                                   const unsigned char *data, size_t count)
 750 {
 751         return 0;
 752 }
 753
 754 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 755                                       struct file *filp, poll_table *wait)
 756 {
 757         return 0;
 758 }
 759
 760 static int __init hci_uart_init(void)
 761 {
 762         static struct tty_ldisc_ops hci_uart_ldisc;
 763         int err;
 764
 765         BT_INFO("HCI UART driver ver %s", VERSION);
 766
 767         /* Register the tty discipline */
 768
 769         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 770         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 771         hci_uart_ldisc.name             = "n_hci";
 772         hci_uart_ldisc.open             = hci_uart_tty_open;
 773         hci_uart_ldisc.close            = hci_uart_tty_close;
 774         hci_uart_ldisc.read             = hci_uart_tty_read;
 775         hci_uart_ldisc.write            = hci_uart_tty_write;
 776         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 777         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 778         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 779         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 780         hci_uart_ldisc.owner            = THIS_MODULE;
 781
 782         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 783         if (err) {
 784                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 785                 return err;
 786         }
 787
 788 #ifdef CONFIG_BT_HCIUART_H4
 789         h4_init();
 790 #endif
 791 #ifdef CONFIG_BT_HCIUART_BCSP
 792         bcsp_init();
 793 #endif
 794 #ifdef CONFIG_BT_HCIUART_LL
 795         ll_init();
 796 #endif
 797 #ifdef CONFIG_BT_HCIUART_ATH3K
 798         ath_init();
 799 #endif
 800 #ifdef CONFIG_BT_HCIUART_3WIRE
 801         h5_init();
 802 #endif
 803 #ifdef CONFIG_BT_HCIUART_INTEL
 804         intel_init();
 805 #endif
 806 #ifdef CONFIG_BT_HCIUART_BCM
 807         bcm_init();
 808 #endif
 809 #ifdef CONFIG_BT_HCIUART_QCA
 810         qca_init();
 811 #endif
 812
 813         return 0;
 814 }
 815
 816 static void __exit hci_uart_exit(void)
 817 {
 818         int err;
 819
 820 #ifdef CONFIG_BT_HCIUART_H4
 821         h4_deinit();
 822 #endif
 823 #ifdef CONFIG_BT_HCIUART_BCSP
 824         bcsp_deinit();
 825 #endif
 826 #ifdef CONFIG_BT_HCIUART_LL
 827         ll_deinit();
 828 #endif
 829 #ifdef CONFIG_BT_HCIUART_ATH3K
 830         ath_deinit();
 831 #endif
 832 #ifdef CONFIG_BT_HCIUART_3WIRE
 833         h5_deinit();
 834 #endif
 835 #ifdef CONFIG_BT_HCIUART_INTEL
 836         intel_deinit();
 837 #endif
 838 #ifdef CONFIG_BT_HCIUART_BCM
 839         bcm_deinit();
 840 #endif
 841 #ifdef CONFIG_BT_HCIUART_QCA
 842         qca_deinit();
 843 #endif
 844
 845         /* Release tty registration of line discipline */
 846         err = tty_unregister_ldisc(N_HCI);
 847         if (err)
 848                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 849 }
 850
 851 module_init(hci_uart_init);
 852 module_exit(hci_uart_exit);
 853
 854 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 855 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 856 MODULE_VERSION(VERSION);
 857 MODULE_LICENSE("GPL");
 858 MODULE_ALIAS_LDISC(N_HCI);