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
 143 static void hci_uart_write_work(struct work_struct *work)
 144 {
 145         struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
 146         struct tty_struct *tty = hu->tty;
 147         struct hci_dev *hdev = hu->hdev;
 148         struct sk_buff *skb;
 149
 150         /* REVISIT: should we cope with bad skbs or ->write() returning
 151          * and error value ?
 152          */
 153
 154 restart:
 155         clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 156
 157         while ((skb = hci_uart_dequeue(hu))) {
 158                 int len;
 159
 160                 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 161                 len = tty->ops->write(tty, skb->data, skb->len);
 162                 hdev->stat.byte_tx += len;
 163
 164                 skb_pull(skb, len);
 165                 if (skb->len) {
 166                         hu->tx_skb = skb;
 167                         break;
 168                 }
 169
 170                 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
 171                 kfree_skb(skb);
 172         }
 173
 174         if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
 175                 goto restart;
 176
 177         clear_bit(HCI_UART_SENDING, &hu->tx_state);
 178 }
 179
 180 static void hci_uart_init_work(struct work_struct *work)
 181 {
 182         struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
 183         int err;
 184
 185         if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 186                 return;
 187
 188         err = hci_register_dev(hu->hdev);
 189         if (err < 0) {
 190                 BT_ERR("Can't register HCI device");
 191                 hci_free_dev(hu->hdev);
 192                 hu->hdev = NULL;
 193                 hu->proto->close(hu);
 194         }
 195
 196         set_bit(HCI_UART_REGISTERED, &hu->flags);
 197 }
 198
 199 int hci_uart_init_ready(struct hci_uart *hu)
 200 {
 201         if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 202                 return -EALREADY;
 203
 204         schedule_work(&hu->init_ready);
 205
 206         return 0;
 207 }
 208
 209 /* ------- Interface to HCI layer ------ */
 210 /* Initialize device */
 211 static int hci_uart_open(struct hci_dev *hdev)
 212 {
 213         BT_DBG("%s %p", hdev->name, hdev);
 214
 215         /* Nothing to do for UART driver */
 216         return 0;
 217 }
 218
 219 /* Reset device */
 220 static int hci_uart_flush(struct hci_dev *hdev)
 221 {
 222         struct hci_uart *hu  = hci_get_drvdata(hdev);
 223         struct tty_struct *tty = hu->tty;
 224
 225         BT_DBG("hdev %p tty %p", hdev, tty);
 226
 227         if (hu->tx_skb) {
 228                 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
 229         }
 230
 231         /* Flush any pending characters in the driver and discipline. */
 232         tty_ldisc_flush(tty);
 233         tty_driver_flush_buffer(tty);
 234
 235         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 236                 hu->proto->flush(hu);
 237
 238         return 0;
 239 }
 240
 241 /* Close device */
 242 static int hci_uart_close(struct hci_dev *hdev)
 243 {
 244         BT_DBG("hdev %p", hdev);
 245
 246         hci_uart_flush(hdev);
 247         hdev->flush = NULL;
 248         return 0;
 249 }
 250
 251 /* Send frames from HCI layer */
 252 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 253 {
 254         struct hci_uart *hu = hci_get_drvdata(hdev);
 255
 256         BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
 257                skb->len);
 258
 259         hu->proto->enqueue(hu, skb);
 260
 261         hci_uart_tx_wakeup(hu);
 262
 263         return 0;
 264 }
 265
 266 /* Check the underlying device or tty has flow control support */
 267 bool hci_uart_has_flow_control(struct hci_uart *hu)
 268 {
 269         if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
 270                 return true;
 271
 272         return false;
 273 }
 274
 275 /* Flow control or un-flow control the device */
 276 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 277 {
 278         struct tty_struct *tty = hu->tty;
 279         struct ktermios ktermios;
 280         int status;
 281         unsigned int set = 0;
 282         unsigned int clear = 0;
 283
 284         if (enable) {
 285                 /* Disable hardware flow control */
 286                 ktermios = tty->termios;
 287                 ktermios.c_cflag &= ~CRTSCTS;
 288                 status = tty_set_termios(tty, &ktermios);
 289                 BT_DBG("Disabling hardware flow control: %s",
 290                        status ? "failed" : "success");
 291
 292                 /* Clear RTS to prevent the device from sending */
 293                 /* Most UARTs need OUT2 to enable interrupts */
 294                 status = tty->driver->ops->tiocmget(tty);
 295                 BT_DBG("Current tiocm 0x%x", status);
 296
 297                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 298                 clear = ~set;
 299                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 300                        TIOCM_OUT2 | TIOCM_LOOP;
 301                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 302                          TIOCM_OUT2 | TIOCM_LOOP;
 303                 status = tty->driver->ops->tiocmset(tty, set, clear);
 304                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 305         } else {
 306                 /* Set RTS to allow the device to send again */
 307                 status = tty->driver->ops->tiocmget(tty);
 308                 BT_DBG("Current tiocm 0x%x", status);
 309
 310                 set |= (TIOCM_OUT2 | TIOCM_RTS);
 311                 clear = ~set;
 312                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 313                        TIOCM_OUT2 | TIOCM_LOOP;
 314                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 315                          TIOCM_OUT2 | TIOCM_LOOP;
 316                 status = tty->driver->ops->tiocmset(tty, set, clear);
 317                 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
 318
 319                 /* Re-enable hardware flow control */
 320                 ktermios = tty->termios;
 321                 ktermios.c_cflag |= CRTSCTS;
 322                 status = tty_set_termios(tty, &ktermios);
 323                 BT_DBG("Enabling hardware flow control: %s",
 324                        status ? "failed" : "success");
 325         }
 326 }
 327
 328 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 329                          unsigned int oper_speed)
 330 {
 331         hu->init_speed = init_speed;
 332         hu->oper_speed = oper_speed;
 333 }
 334
 335 void hci_uart_init_tty(struct hci_uart *hu)
 336 {
 337         struct tty_struct *tty = hu->tty;
 338         struct ktermios ktermios;
 339
 340         /* Bring the UART into a known 8 bits no parity hw fc state */
 341         ktermios = tty->termios;
 342         ktermios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
 343                               INLCR | IGNCR | ICRNL | IXON);
 344         ktermios.c_oflag &= ~OPOST;
 345         ktermios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 346         ktermios.c_cflag &= ~(CSIZE | PARENB);
 347         ktermios.c_cflag |= CS8;
 348         ktermios.c_cflag |= CRTSCTS;
 349
 350         /* tty_set_termios() return not checked as it is always 0 */
 351         tty_set_termios(tty, &ktermios);
 352 }
 353
 354 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 355 {
 356         struct tty_struct *tty = hu->tty;
 357         struct ktermios ktermios;
 358
 359         ktermios = tty->termios;
 360         ktermios.c_cflag &= ~CBAUD;
 361         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 362
 363         /* tty_set_termios() return not checked as it is always 0 */
 364         tty_set_termios(tty, &ktermios);
 365
 366         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 367                tty->termios.c_ispeed, tty->termios.c_ospeed);
 368 }
 369
 370 static int hci_uart_setup(struct hci_dev *hdev)
 371 {
 372         struct hci_uart *hu = hci_get_drvdata(hdev);
 373         struct hci_rp_read_local_version *ver;
 374         struct sk_buff *skb;
 375         unsigned int speed;
 376         int err;
 377
 378         /* Init speed if any */
 379         if (hu->init_speed)
 380                 speed = hu->init_speed;
 381         else if (hu->proto->init_speed)
 382                 speed = hu->proto->init_speed;
 383         else
 384                 speed = 0;
 385
 386         if (speed)
 387                 hci_uart_set_baudrate(hu, speed);
 388
 389         /* Operational speed if any */
 390         if (hu->oper_speed)
 391                 speed = hu->oper_speed;
 392         else if (hu->proto->oper_speed)
 393                 speed = hu->proto->oper_speed;
 394         else
 395                 speed = 0;
 396
 397         if (hu->proto->set_baudrate && speed) {
 398                 err = hu->proto->set_baudrate(hu, speed);
 399                 if (!err)
 400                         hci_uart_set_baudrate(hu, speed);
 401         }
 402
 403         if (hu->proto->setup)
 404                 return hu->proto->setup(hu);
 405
 406         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 407                 return 0;
 408
 409         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 410                              HCI_INIT_TIMEOUT);
 411         if (IS_ERR(skb)) {
 412                 BT_ERR("%s: Reading local version information failed (%ld)",
 413                        hdev->name, PTR_ERR(skb));
 414                 return 0;
 415         }
 416
 417         if (skb->len != sizeof(*ver)) {
 418                 BT_ERR("%s: Event length mismatch for version information",
 419                        hdev->name);
 420                 goto done;
 421         }
 422
 423         ver = (struct hci_rp_read_local_version *)skb->data;
 424
 425         switch (le16_to_cpu(ver->manufacturer)) {
 426 #ifdef CONFIG_BT_HCIUART_INTEL
 427         case 2:
 428                 hdev->set_bdaddr = btintel_set_bdaddr;
 429                 btintel_check_bdaddr(hdev);
 430                 break;
 431 #endif
 432 #ifdef CONFIG_BT_HCIUART_BCM
 433         case 15:
 434                 hdev->set_bdaddr = btbcm_set_bdaddr;
 435                 btbcm_check_bdaddr(hdev);
 436                 break;
 437 #endif
 438         }
 439
 440 done:
 441         kfree_skb(skb);
 442         return 0;
 443 }
 444
 445 /* ------ LDISC part ------ */
 446 /* hci_uart_tty_open
 447  *
 448  *     Called when line discipline changed to HCI_UART.
 449  *
 450  * Arguments:
 451  *     tty    pointer to tty info structure
 452  * Return Value:
 453  *     0 if success, otherwise error code
 454  */
 455 static int hci_uart_tty_open(struct tty_struct *tty)
 456 {
 457         struct hci_uart *hu;
 458
 459         BT_DBG("tty %p", tty);
 460
 461         /* Error if the tty has no write op instead of leaving an exploitable
 462            hole */
 463         if (tty->ops->write == NULL)
 464                 return -EOPNOTSUPP;
 465
 466         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 467         if (!hu) {
 468                 BT_ERR("Can't allocate control structure");
 469                 return -ENFILE;
 470         }
 471
 472         tty->disc_data = hu;
 473         hu->tty = tty;
 474         tty->receive_room = 65536;
 475
 476         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 477         INIT_WORK(&hu->write_work, hci_uart_write_work);
 478
 479         /* Flush any pending characters in the driver */
 480         tty_driver_flush_buffer(tty);
 481
 482         return 0;
 483 }
 484
 485 /* hci_uart_tty_close()
 486  *
 487  *    Called when the line discipline is changed to something
 488  *    else, the tty is closed, or the tty detects a hangup.
 489  */
 490 static void hci_uart_tty_close(struct tty_struct *tty)
 491 {
 492         struct hci_uart *hu = tty->disc_data;
 493         struct hci_dev *hdev;
 494
 495         BT_DBG("tty %p", tty);
 496
 497         /* Detach from the tty */
 498         tty->disc_data = NULL;
 499
 500         if (!hu)
 501                 return;
 502
 503         hdev = hu->hdev;
 504         if (hdev)
 505                 hci_uart_close(hdev);
 506
 507         cancel_work_sync(&hu->write_work);
 508
 509         if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 510                 if (hdev) {
 511                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 512                                 hci_unregister_dev(hdev);
 513                         hci_free_dev(hdev);
 514                 }
 515                 hu->proto->close(hu);
 516         }
 517         clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 518
 519         kfree(hu);
 520 }
 521
 522 /* hci_uart_tty_wakeup()
 523  *
 524  *    Callback for transmit wakeup. Called when low level
 525  *    device driver can accept more send data.
 526  *
 527  * Arguments:        tty    pointer to associated tty instance data
 528  * Return Value:    None
 529  */
 530 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 531 {
 532         struct hci_uart *hu = tty->disc_data;
 533
 534         BT_DBG("");
 535
 536         if (!hu)
 537                 return;
 538
 539         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 540
 541         if (tty != hu->tty)
 542                 return;
 543
 544         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 545                 hci_uart_tx_wakeup(hu);
 546 }
 547
 548 /* hci_uart_tty_receive()
 549  *
 550  *     Called by tty low level driver when receive data is
 551  *     available.
 552  *
 553  * Arguments:  tty          pointer to tty isntance data
 554  *             data         pointer to received data
 555  *             flags        pointer to flags for data
 556  *             count        count of received data in bytes
 557  *
 558  * Return Value:    None
 559  */
 560 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 561                                  char *flags, int count)
 562 {
 563         struct hci_uart *hu = tty->disc_data;
 564
 565         if (!hu || tty != hu->tty)
 566                 return;
 567
 568         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 569                 return;
 570
 571         /* It does not need a lock here as it is already protected by a mutex in
 572          * tty caller
 573          */
 574         hu->proto->recv(hu, data, count);
 575
 576         if (hu->hdev)
 577                 hu->hdev->stat.byte_rx += count;
 578
 579         tty_unthrottle(tty);
 580 }
 581
 582 static int hci_uart_register_dev(struct hci_uart *hu)
 583 {
 584         struct hci_dev *hdev;
 585
 586         BT_DBG("");
 587
 588         /* Initialize and register HCI device */
 589         hdev = hci_alloc_dev();
 590         if (!hdev) {
 591                 BT_ERR("Can't allocate HCI device");
 592                 return -ENOMEM;
 593         }
 594
 595         hu->hdev = hdev;
 596
 597         hdev->bus = HCI_UART;
 598         hci_set_drvdata(hdev, hu);
 599
 600         /* Only when vendor specific setup callback is provided, consider
 601          * the manufacturer information valid. This avoids filling in the
 602          * value for Ericsson when nothing is specified.
 603          */
 604         if (hu->proto->setup)
 605                 hdev->manufacturer = hu->proto->manufacturer;
 606
 607         hdev->open  = hci_uart_open;
 608         hdev->close = hci_uart_close;
 609         hdev->flush = hci_uart_flush;
 610         hdev->send  = hci_uart_send_frame;
 611         hdev->setup = hci_uart_setup;
 612         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 613
 614         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 615                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 616
 617         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 618                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 619
 620         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 621                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 622
 623         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 624                 hdev->dev_type = HCI_AMP;
 625         else
 626                 hdev->dev_type = HCI_PRIMARY;
 627
 628         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 629                 return 0;
 630
 631         if (hci_register_dev(hdev) < 0) {
 632                 BT_ERR("Can't register HCI device");
 633                 hci_free_dev(hdev);
 634                 return -ENODEV;
 635         }
 636
 637         set_bit(HCI_UART_REGISTERED, &hu->flags);
 638
 639         return 0;
 640 }
 641
 642 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 643 {
 644         const struct hci_uart_proto *p;
 645         int err;
 646
 647         p = hci_uart_get_proto(id);
 648         if (!p)
 649                 return -EPROTONOSUPPORT;
 650
 651         err = p->open(hu);
 652         if (err)
 653                 return err;
 654
 655         hu->proto = p;
 656         set_bit(HCI_UART_PROTO_READY, &hu->flags);
 657
 658         err = hci_uart_register_dev(hu);
 659         if (err) {
 660                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 661                 p->close(hu);
 662                 return err;
 663         }
 664
 665         return 0;
 666 }
 667
 668 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 669 {
 670         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 671                                     BIT(HCI_UART_RESET_ON_INIT) |
 672                                     BIT(HCI_UART_CREATE_AMP) |
 673                                     BIT(HCI_UART_INIT_PENDING) |
 674                                     BIT(HCI_UART_EXT_CONFIG) |
 675                                     BIT(HCI_UART_VND_DETECT);
 676
 677         if (flags & ~valid_flags)
 678                 return -EINVAL;
 679
 680         hu->hdev_flags = flags;
 681
 682         return 0;
 683 }
 684
 685 /* hci_uart_tty_ioctl()
 686  *
 687  *    Process IOCTL system call for the tty device.
 688  *
 689  * Arguments:
 690  *
 691  *    tty        pointer to tty instance data
 692  *    file       pointer to open file object for device
 693  *    cmd        IOCTL command code
 694  *    arg        argument for IOCTL call (cmd dependent)
 695  *
 696  * Return Value:    Command dependent
 697  */
 698 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 699                               unsigned int cmd, unsigned long arg)
 700 {
 701         struct hci_uart *hu = tty->disc_data;
 702         int err = 0;
 703
 704         BT_DBG("");
 705
 706         /* Verify the status of the device */
 707         if (!hu)
 708                 return -EBADF;
 709
 710         switch (cmd) {
 711         case HCIUARTSETPROTO:
 712                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 713                         err = hci_uart_set_proto(hu, arg);
 714                         if (err)
 715                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 716                 } else
 717                         err = -EBUSY;
 718                 break;
 719
 720         case HCIUARTGETPROTO:
 721                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 722                         err = hu->proto->id;
 723                 else
 724                         err = -EUNATCH;
 725                 break;
 726
 727         case HCIUARTGETDEVICE:
 728                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 729                         err = hu->hdev->id;
 730                 else
 731                         err = -EUNATCH;
 732                 break;
 733
 734         case HCIUARTSETFLAGS:
 735                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 736                         err = -EBUSY;
 737                 else
 738                         err = hci_uart_set_flags(hu, arg);
 739                 break;
 740
 741         case HCIUARTGETFLAGS:
 742                 err = hu->hdev_flags;
 743                 break;
 744
 745         default:
 746                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 747                 break;
 748         }
 749
 750         return err;
 751 }
 752
 753 /*
 754  * We don't provide read/write/poll interface for user space.
 755  */
 756 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 757                                  unsigned char __user *buf, size_t nr)
 758 {
 759         return 0;
 760 }
 761
 762 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 763                                   const unsigned char *data, size_t count)
 764 {
 765         return 0;
 766 }
 767
 768 static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 769                                       struct file *filp, poll_table *wait)
 770 {
 771         return 0;
 772 }
 773
 774 static int __init hci_uart_init(void)
 775 {
 776         static struct tty_ldisc_ops hci_uart_ldisc;
 777         int err;
 778
 779         BT_INFO("HCI UART driver ver %s", VERSION);
 780
 781         /* Register the tty discipline */
 782
 783         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 784         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 785         hci_uart_ldisc.name             = "n_hci";
 786         hci_uart_ldisc.open             = hci_uart_tty_open;
 787         hci_uart_ldisc.close            = hci_uart_tty_close;
 788         hci_uart_ldisc.read             = hci_uart_tty_read;
 789         hci_uart_ldisc.write            = hci_uart_tty_write;
 790         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 791         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 792         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 793         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 794         hci_uart_ldisc.owner            = THIS_MODULE;
 795
 796         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 797         if (err) {
 798                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 799                 return err;
 800         }
 801
 802 #ifdef CONFIG_BT_HCIUART_H4
 803         h4_init();
 804 #endif
 805 #ifdef CONFIG_BT_HCIUART_BCSP
 806         bcsp_init();
 807 #endif
 808 #ifdef CONFIG_BT_HCIUART_LL
 809         ll_init();
 810 #endif
 811 #ifdef CONFIG_BT_HCIUART_ATH3K
 812         ath_init();
 813 #endif
 814 #ifdef CONFIG_BT_HCIUART_3WIRE
 815         h5_init();
 816 #endif
 817 #ifdef CONFIG_BT_HCIUART_INTEL
 818         intel_init();
 819 #endif
 820 #ifdef CONFIG_BT_HCIUART_BCM
 821         bcm_init();
 822 #endif
 823 #ifdef CONFIG_BT_HCIUART_QCA
 824         qca_init();
 825 #endif
 826 #ifdef CONFIG_BT_HCIUART_AG6XX
 827         ag6xx_init();
 828 #endif
 829 #ifdef CONFIG_BT_HCIUART_MRVL
 830         mrvl_init();
 831 #endif
 832
 833         return 0;
 834 }
 835
 836 static void __exit hci_uart_exit(void)
 837 {
 838         int err;
 839
 840 #ifdef CONFIG_BT_HCIUART_H4
 841         h4_deinit();
 842 #endif
 843 #ifdef CONFIG_BT_HCIUART_BCSP
 844         bcsp_deinit();
 845 #endif
 846 #ifdef CONFIG_BT_HCIUART_LL
 847         ll_deinit();
 848 #endif
 849 #ifdef CONFIG_BT_HCIUART_ATH3K
 850         ath_deinit();
 851 #endif
 852 #ifdef CONFIG_BT_HCIUART_3WIRE
 853         h5_deinit();
 854 #endif
 855 #ifdef CONFIG_BT_HCIUART_INTEL
 856         intel_deinit();
 857 #endif
 858 #ifdef CONFIG_BT_HCIUART_BCM
 859         bcm_deinit();
 860 #endif
 861 #ifdef CONFIG_BT_HCIUART_QCA
 862         qca_deinit();
 863 #endif
 864 #ifdef CONFIG_BT_HCIUART_AG6XX
 865         ag6xx_deinit();
 866 #endif
 867 #ifdef CONFIG_BT_HCIUART_MRVL
 868         mrvl_deinit();
 869 #endif
 870
 871         /* Release tty registration of line discipline */
 872         err = tty_unregister_ldisc(N_HCI);
 873         if (err)
 874                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 875 }
 876
 877 module_init(hci_uart_init);
 878 module_exit(hci_uart_exit);
 879
 880 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 881 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 882 MODULE_VERSION(VERSION);
 883 MODULE_LICENSE("GPL");
 884 MODULE_ALIAS_LDISC(N_HCI);