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 #include <linux/serdev.h>
  45
  46 #include <net/bluetooth/bluetooth.h>
  47 #include <net/bluetooth/hci_core.h>
  48
  49 #include "btintel.h"
  50 #include "btbcm.h"
  51 #include "hci_uart.h"
  52
  53 #define VERSION "2.3"
  54
  55 static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
  56
  57 int hci_uart_register_proto(const struct hci_uart_proto *p)
  58 {
  59         if (p->id >= HCI_UART_MAX_PROTO)
  60                 return -EINVAL;
  61
  62         if (hup[p->id])
  63                 return -EEXIST;
  64
  65         hup[p->id] = p;
  66
  67         BT_INFO("HCI UART protocol %s registered", p->name);
  68
  69         return 0;
  70 }
  71
  72 int hci_uart_unregister_proto(const struct hci_uart_proto *p)
  73 {
  74         if (p->id >= HCI_UART_MAX_PROTO)
  75                 return -EINVAL;
  76
  77         if (!hup[p->id])
  78                 return -EINVAL;
  79
  80         hup[p->id] = NULL;
  81
  82         return 0;
  83 }
  84
  85 static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
  86 {
  87         if (id >= HCI_UART_MAX_PROTO)
  88                 return NULL;
  89
  90         return hup[id];
  91 }
  92
  93 static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
  94 {
  95         struct hci_dev *hdev = hu->hdev;
  96
  97         /* Update HCI stat counters */
  98         switch (pkt_type) {
  99         case HCI_COMMAND_PKT:
 100                 hdev->stat.cmd_tx++;
 101                 break;
 102
 103         case HCI_ACLDATA_PKT:
 104                 hdev->stat.acl_tx++;
 105                 break;
 106
 107         case HCI_SCODATA_PKT:
 108                 hdev->stat.sco_tx++;
 109                 break;
 110         }
 111 }
 112
 113 static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
 114 {
 115         struct sk_buff *skb = hu->tx_skb;
 116
 117         if (!skb) {
 118                 percpu_down_read(&hu->proto_lock);
 119
 120                 if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 121                         skb = hu->proto->dequeue(hu);
 122
 123                 percpu_up_read(&hu->proto_lock);
 124         } else {
 125                 hu->tx_skb = NULL;
 126         }
 127
 128         return skb;
 129 }
 130
 131 int hci_uart_tx_wakeup(struct hci_uart *hu)
 132 {
 133         /* This may be called in an IRQ context, so we can't sleep. Therefore
 134          * we try to acquire the lock only, and if that fails we assume the
 135          * tty is being closed because that is the only time the write lock is
 136          * acquired. If, however, at some point in the future the write lock
 137          * is also acquired in other situations, then this must be revisited.
 138          */
 139         if (!percpu_down_read_trylock(&hu->proto_lock))
 140                 return 0;
 141
 142         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 143                 goto no_schedule;
 144
 145         if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
 146                 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 147                 goto no_schedule;
 148         }
 149
 150         BT_DBG("");
 151
 152         schedule_work(&hu->write_work);
 153
 154 no_schedule:
 155         percpu_up_read(&hu->proto_lock);
 156
 157         return 0;
 158 }
 159 EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
 160
 161 static void hci_uart_write_work(struct work_struct *work)
 162 {
 163         struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
 164         struct tty_struct *tty = hu->tty;
 165         struct hci_dev *hdev = hu->hdev;
 166         struct sk_buff *skb;
 167
 168         /* REVISIT: should we cope with bad skbs or ->write() returning
 169          * and error value ?
 170          */
 171
 172 restart:
 173         clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
 174
 175         while ((skb = hci_uart_dequeue(hu))) {
 176                 int len;
 177
 178                 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 179                 len = tty->ops->write(tty, skb->data, skb->len);
 180                 hdev->stat.byte_tx += len;
 181
 182                 skb_pull(skb, len);
 183                 if (skb->len) {
 184                         hu->tx_skb = skb;
 185                         break;
 186                 }
 187
 188                 hci_uart_tx_complete(hu, hci_skb_pkt_type(skb));
 189                 kfree_skb(skb);
 190         }
 191
 192         if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
 193                 goto restart;
 194
 195         clear_bit(HCI_UART_SENDING, &hu->tx_state);
 196 }
 197
 198 void hci_uart_init_work(struct work_struct *work)
 199 {
 200         struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
 201         int err;
 202         struct hci_dev *hdev;
 203
 204         if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 205                 return;
 206
 207         err = hci_register_dev(hu->hdev);
 208         if (err < 0) {
 209                 BT_ERR("Can't register HCI device");
 210                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 211                 hu->proto->close(hu);
 212                 hdev = hu->hdev;
 213                 hu->hdev = NULL;
 214                 hci_free_dev(hdev);
 215                 return;
 216         }
 217
 218         set_bit(HCI_UART_REGISTERED, &hu->flags);
 219 }
 220
 221 int hci_uart_init_ready(struct hci_uart *hu)
 222 {
 223         if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 224                 return -EALREADY;
 225
 226         schedule_work(&hu->init_ready);
 227
 228         return 0;
 229 }
 230
 231 /* ------- Interface to HCI layer ------ */
 232 /* Reset device */
 233 static int hci_uart_flush(struct hci_dev *hdev)
 234 {
 235         struct hci_uart *hu  = hci_get_drvdata(hdev);
 236         struct tty_struct *tty = hu->tty;
 237
 238         BT_DBG("hdev %p tty %p", hdev, tty);
 239
 240         if (hu->tx_skb) {
 241                 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
 242         }
 243
 244         /* Flush any pending characters in the driver and discipline. */
 245         tty_ldisc_flush(tty);
 246         tty_driver_flush_buffer(tty);
 247
 248         percpu_down_read(&hu->proto_lock);
 249
 250         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 251                 hu->proto->flush(hu);
 252
 253         percpu_up_read(&hu->proto_lock);
 254
 255         return 0;
 256 }
 257
 258 /* Initialize device */
 259 static int hci_uart_open(struct hci_dev *hdev)
 260 {
 261         BT_DBG("%s %p", hdev->name, hdev);
 262
 263         /* Undo clearing this from hci_uart_close() */
 264         hdev->flush = hci_uart_flush;
 265
 266         return 0;
 267 }
 268
 269 /* Close device */
 270 static int hci_uart_close(struct hci_dev *hdev)
 271 {
 272         BT_DBG("hdev %p", hdev);
 273
 274         hci_uart_flush(hdev);
 275         hdev->flush = NULL;
 276         return 0;
 277 }
 278
 279 /* Send frames from HCI layer */
 280 static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 281 {
 282         struct hci_uart *hu = hci_get_drvdata(hdev);
 283
 284         BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
 285                skb->len);
 286
 287         percpu_down_read(&hu->proto_lock);
 288
 289         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 290                 percpu_up_read(&hu->proto_lock);
 291                 return -EUNATCH;
 292         }
 293
 294         hu->proto->enqueue(hu, skb);
 295         percpu_up_read(&hu->proto_lock);
 296
 297         hci_uart_tx_wakeup(hu);
 298
 299         return 0;
 300 }
 301
 302 /* Check the underlying device or tty has flow control support */
 303 bool hci_uart_has_flow_control(struct hci_uart *hu)
 304 {
 305         /* serdev nodes check if the needed operations are present */
 306         if (hu->serdev)
 307                 return true;
 308
 309         if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
 310                 return true;
 311
 312         return false;
 313 }
 314
 315 /* Flow control or un-flow control the device */
 316 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 317 {
 318         struct tty_struct *tty = hu->tty;
 319         struct ktermios ktermios;
 320         int status;
 321         unsigned int set = 0;
 322         unsigned int clear = 0;
 323
 324         if (hu->serdev) {
 325                 serdev_device_set_flow_control(hu->serdev, !enable);
 326                 serdev_device_set_rts(hu->serdev, !enable);
 327                 return;
 328         }
 329
 330         if (enable) {
 331                 /* Disable hardware flow control */
 332                 ktermios = tty->termios;
 333                 ktermios.c_cflag &= ~CRTSCTS;
 334                 status = tty_set_termios(tty, &ktermios);
 335                 BT_DBG("Disabling hardware flow control: %s",
 336                        status ? "failed" : "success");
 337
 338                 /* Clear RTS to prevent the device from sending */
 339                 /* Most UARTs need OUT2 to enable interrupts */
 340                 status = tty->driver->ops->tiocmget(tty);
 341                 BT_DBG("Current tiocm 0x%x", status);
 342
 343                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 344                 clear = ~set;
 345                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 346                        TIOCM_OUT2 | TIOCM_LOOP;
 347                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 348                          TIOCM_OUT2 | TIOCM_LOOP;
 349                 status = tty->driver->ops->tiocmset(tty, set, clear);
 350                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 351         } else {
 352                 /* Set RTS to allow the device to send again */
 353                 status = tty->driver->ops->tiocmget(tty);
 354                 BT_DBG("Current tiocm 0x%x", status);
 355
 356                 set |= (TIOCM_OUT2 | TIOCM_RTS);
 357                 clear = ~set;
 358                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 359                        TIOCM_OUT2 | TIOCM_LOOP;
 360                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 361                          TIOCM_OUT2 | TIOCM_LOOP;
 362                 status = tty->driver->ops->tiocmset(tty, set, clear);
 363                 BT_DBG("Setting RTS: %s", status ? "failed" : "success");
 364
 365                 /* Re-enable hardware flow control */
 366                 ktermios = tty->termios;
 367                 ktermios.c_cflag |= CRTSCTS;
 368                 status = tty_set_termios(tty, &ktermios);
 369                 BT_DBG("Enabling hardware flow control: %s",
 370                        status ? "failed" : "success");
 371         }
 372 }
 373
 374 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 375                          unsigned int oper_speed)
 376 {
 377         hu->init_speed = init_speed;
 378         hu->oper_speed = oper_speed;
 379 }
 380
 381 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 382 {
 383         struct tty_struct *tty = hu->tty;
 384         struct ktermios ktermios;
 385
 386         ktermios = tty->termios;
 387         ktermios.c_cflag &= ~CBAUD;
 388         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 389
 390         /* tty_set_termios() return not checked as it is always 0 */
 391         tty_set_termios(tty, &ktermios);
 392
 393         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 394                tty->termios.c_ispeed, tty->termios.c_ospeed);
 395 }
 396
 397 static int hci_uart_setup(struct hci_dev *hdev)
 398 {
 399         struct hci_uart *hu = hci_get_drvdata(hdev);
 400         struct hci_rp_read_local_version *ver;
 401         struct sk_buff *skb;
 402         unsigned int speed;
 403         int err;
 404
 405         /* Init speed if any */
 406         if (hu->init_speed)
 407                 speed = hu->init_speed;
 408         else if (hu->proto->init_speed)
 409                 speed = hu->proto->init_speed;
 410         else
 411                 speed = 0;
 412
 413         if (speed)
 414                 hci_uart_set_baudrate(hu, speed);
 415
 416         /* Operational speed if any */
 417         if (hu->oper_speed)
 418                 speed = hu->oper_speed;
 419         else if (hu->proto->oper_speed)
 420                 speed = hu->proto->oper_speed;
 421         else
 422                 speed = 0;
 423
 424         if (hu->proto->set_baudrate && speed) {
 425                 err = hu->proto->set_baudrate(hu, speed);
 426                 if (!err)
 427                         hci_uart_set_baudrate(hu, speed);
 428         }
 429
 430         if (hu->proto->setup)
 431                 return hu->proto->setup(hu);
 432
 433         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 434                 return 0;
 435
 436         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 437                              HCI_INIT_TIMEOUT);
 438         if (IS_ERR(skb)) {
 439                 BT_ERR("%s: Reading local version information failed (%ld)",
 440                        hdev->name, PTR_ERR(skb));
 441                 return 0;
 442         }
 443
 444         if (skb->len != sizeof(*ver)) {
 445                 BT_ERR("%s: Event length mismatch for version information",
 446                        hdev->name);
 447                 goto done;
 448         }
 449
 450         ver = (struct hci_rp_read_local_version *)skb->data;
 451
 452         switch (le16_to_cpu(ver->manufacturer)) {
 453 #ifdef CONFIG_BT_HCIUART_INTEL
 454         case 2:
 455                 hdev->set_bdaddr = btintel_set_bdaddr;
 456                 btintel_check_bdaddr(hdev);
 457                 break;
 458 #endif
 459 #ifdef CONFIG_BT_HCIUART_BCM
 460         case 15:
 461                 hdev->set_bdaddr = btbcm_set_bdaddr;
 462                 btbcm_check_bdaddr(hdev);
 463                 break;
 464 #endif
 465         default:
 466                 break;
 467         }
 468
 469 done:
 470         kfree_skb(skb);
 471         return 0;
 472 }
 473
 474 /* ------ LDISC part ------ */
 475 /* hci_uart_tty_open
 476  *
 477  *     Called when line discipline changed to HCI_UART.
 478  *
 479  * Arguments:
 480  *     tty    pointer to tty info structure
 481  * Return Value:
 482  *     0 if success, otherwise error code
 483  */
 484 static int hci_uart_tty_open(struct tty_struct *tty)
 485 {
 486         struct hci_uart *hu;
 487
 488         BT_DBG("tty %p", tty);
 489
 490         /* Error if the tty has no write op instead of leaving an exploitable
 491          * hole
 492          */
 493         if (tty->ops->write == NULL)
 494                 return -EOPNOTSUPP;
 495
 496         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 497         if (!hu) {
 498                 BT_ERR("Can't allocate control structure");
 499                 return -ENFILE;
 500         }
 501
 502         tty->disc_data = hu;
 503         hu->tty = tty;
 504         tty->receive_room = 65536;
 505
 506         /* disable alignment support by default */
 507         hu->alignment = 1;
 508         hu->padding = 0;
 509
 510         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 511         INIT_WORK(&hu->write_work, hci_uart_write_work);
 512
 513         percpu_init_rwsem(&hu->proto_lock);
 514
 515         /* Flush any pending characters in the driver */
 516         tty_driver_flush_buffer(tty);
 517
 518         return 0;
 519 }
 520
 521 /* hci_uart_tty_close()
 522  *
 523  *    Called when the line discipline is changed to something
 524  *    else, the tty is closed, or the tty detects a hangup.
 525  */
 526 static void hci_uart_tty_close(struct tty_struct *tty)
 527 {
 528         struct hci_uart *hu = tty->disc_data;
 529         struct hci_dev *hdev;
 530
 531         BT_DBG("tty %p", tty);
 532
 533         /* Detach from the tty */
 534         tty->disc_data = NULL;
 535
 536         if (!hu)
 537                 return;
 538
 539         hdev = hu->hdev;
 540         if (hdev)
 541                 hci_uart_close(hdev);
 542
 543         if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 544                 percpu_down_write(&hu->proto_lock);
 545                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 546                 percpu_up_write(&hu->proto_lock);
 547
 548                 cancel_work_sync(&hu->init_ready);
 549                 cancel_work_sync(&hu->write_work);
 550
 551                 if (hdev) {
 552                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 553                                 hci_unregister_dev(hdev);
 554                         hci_free_dev(hdev);
 555                 }
 556                 hu->proto->close(hu);
 557         }
 558         clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 559
 560         percpu_free_rwsem(&hu->proto_lock);
 561
 562         kfree(hu);
 563 }
 564
 565 /* hci_uart_tty_wakeup()
 566  *
 567  *    Callback for transmit wakeup. Called when low level
 568  *    device driver can accept more send data.
 569  *
 570  * Arguments:        tty    pointer to associated tty instance data
 571  * Return Value:    None
 572  */
 573 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 574 {
 575         struct hci_uart *hu = tty->disc_data;
 576
 577         BT_DBG("");
 578
 579         if (!hu)
 580                 return;
 581
 582         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 583
 584         if (tty != hu->tty)
 585                 return;
 586
 587         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 588                 hci_uart_tx_wakeup(hu);
 589 }
 590
 591 /* hci_uart_tty_receive()
 592  *
 593  *     Called by tty low level driver when receive data is
 594  *     available.
 595  *
 596  * Arguments:  tty          pointer to tty isntance data
 597  *             data         pointer to received data
 598  *             flags        pointer to flags for data
 599  *             count        count of received data in bytes
 600  *
 601  * Return Value:    None
 602  */
 603 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 604                                  char *flags, int count)
 605 {
 606         struct hci_uart *hu = tty->disc_data;
 607
 608         if (!hu || tty != hu->tty)
 609                 return;
 610
 611         percpu_down_read(&hu->proto_lock);
 612
 613         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 614                 percpu_up_read(&hu->proto_lock);
 615                 return;
 616         }
 617
 618         /* It does not need a lock here as it is already protected by a mutex in
 619          * tty caller
 620          */
 621         hu->proto->recv(hu, data, count);
 622         percpu_up_read(&hu->proto_lock);
 623
 624         if (hu->hdev)
 625                 hu->hdev->stat.byte_rx += count;
 626
 627         tty_unthrottle(tty);
 628 }
 629
 630 static int hci_uart_register_dev(struct hci_uart *hu)
 631 {
 632         struct hci_dev *hdev;
 633         int err;
 634
 635         BT_DBG("");
 636
 637         /* Initialize and register HCI device */
 638         hdev = hci_alloc_dev();
 639         if (!hdev) {
 640                 BT_ERR("Can't allocate HCI device");
 641                 return -ENOMEM;
 642         }
 643
 644         hu->hdev = hdev;
 645
 646         hdev->bus = HCI_UART;
 647         hci_set_drvdata(hdev, hu);
 648
 649         /* Only when vendor specific setup callback is provided, consider
 650          * the manufacturer information valid. This avoids filling in the
 651          * value for Ericsson when nothing is specified.
 652          */
 653         if (hu->proto->setup)
 654                 hdev->manufacturer = hu->proto->manufacturer;
 655
 656         hdev->open  = hci_uart_open;
 657         hdev->close = hci_uart_close;
 658         hdev->flush = hci_uart_flush;
 659         hdev->send  = hci_uart_send_frame;
 660         hdev->setup = hci_uart_setup;
 661         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 662
 663         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 664                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 665
 666         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 667                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 668
 669         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 670                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 671
 672         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 673                 hdev->dev_type = HCI_AMP;
 674         else
 675                 hdev->dev_type = HCI_PRIMARY;
 676
 677         /* Only call open() for the protocol after hdev is fully initialized as
 678          * open() (or a timer/workqueue it starts) may attempt to reference it.
 679          */
 680         err = hu->proto->open(hu);
 681         if (err) {
 682                 hu->hdev = NULL;
 683                 hci_free_dev(hdev);
 684                 return err;
 685         }
 686
 687         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 688                 return 0;
 689
 690         if (hci_register_dev(hdev) < 0) {
 691                 BT_ERR("Can't register HCI device");
 692                 hu->proto->close(hu);
 693                 hu->hdev = NULL;
 694                 hci_free_dev(hdev);
 695                 return -ENODEV;
 696         }
 697
 698         set_bit(HCI_UART_REGISTERED, &hu->flags);
 699
 700         return 0;
 701 }
 702
 703 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 704 {
 705         const struct hci_uart_proto *p;
 706         int err;
 707
 708         p = hci_uart_get_proto(id);
 709         if (!p)
 710                 return -EPROTONOSUPPORT;
 711
 712         hu->proto = p;
 713
 714         err = hci_uart_register_dev(hu);
 715         if (err) {
 716                 return err;
 717         }
 718
 719         set_bit(HCI_UART_PROTO_READY, &hu->flags);
 720         return 0;
 721 }
 722
 723 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 724 {
 725         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 726                                     BIT(HCI_UART_RESET_ON_INIT) |
 727                                     BIT(HCI_UART_CREATE_AMP) |
 728                                     BIT(HCI_UART_INIT_PENDING) |
 729                                     BIT(HCI_UART_EXT_CONFIG) |
 730                                     BIT(HCI_UART_VND_DETECT);
 731
 732         if (flags & ~valid_flags)
 733                 return -EINVAL;
 734
 735         hu->hdev_flags = flags;
 736
 737         return 0;
 738 }
 739
 740 /* hci_uart_tty_ioctl()
 741  *
 742  *    Process IOCTL system call for the tty device.
 743  *
 744  * Arguments:
 745  *
 746  *    tty        pointer to tty instance data
 747  *    file       pointer to open file object for device
 748  *    cmd        IOCTL command code
 749  *    arg        argument for IOCTL call (cmd dependent)
 750  *
 751  * Return Value:    Command dependent
 752  */
 753 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 754                               unsigned int cmd, unsigned long arg)
 755 {
 756         struct hci_uart *hu = tty->disc_data;
 757         int err = 0;
 758
 759         BT_DBG("");
 760
 761         /* Verify the status of the device */
 762         if (!hu)
 763                 return -EBADF;
 764
 765         switch (cmd) {
 766         case HCIUARTSETPROTO:
 767                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 768                         err = hci_uart_set_proto(hu, arg);
 769                         if (err)
 770                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 771                 } else
 772                         err = -EBUSY;
 773                 break;
 774
 775         case HCIUARTGETPROTO:
 776                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 777                         err = hu->proto->id;
 778                 else
 779                         err = -EUNATCH;
 780                 break;
 781
 782         case HCIUARTGETDEVICE:
 783                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 784                         err = hu->hdev->id;
 785                 else
 786                         err = -EUNATCH;
 787                 break;
 788
 789         case HCIUARTSETFLAGS:
 790                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 791                         err = -EBUSY;
 792                 else
 793                         err = hci_uart_set_flags(hu, arg);
 794                 break;
 795
 796         case HCIUARTGETFLAGS:
 797                 err = hu->hdev_flags;
 798                 break;
 799
 800         default:
 801                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 802                 break;
 803         }
 804
 805         return err;
 806 }
 807
 808 /*
 809  * We don't provide read/write/poll interface for user space.
 810  */
 811 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 812                                  unsigned char __user *buf, size_t nr)
 813 {
 814         return 0;
 815 }
 816
 817 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 818                                   const unsigned char *data, size_t count)
 819 {
 820         return 0;
 821 }
 822
 823 static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
 824                                       struct file *filp, poll_table *wait)
 825 {
 826         return 0;
 827 }
 828
 829 static int __init hci_uart_init(void)
 830 {
 831         static struct tty_ldisc_ops hci_uart_ldisc;
 832         int err;
 833
 834         BT_INFO("HCI UART driver ver %s", VERSION);
 835
 836         /* Register the tty discipline */
 837
 838         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 839         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 840         hci_uart_ldisc.name             = "n_hci";
 841         hci_uart_ldisc.open             = hci_uart_tty_open;
 842         hci_uart_ldisc.close            = hci_uart_tty_close;
 843         hci_uart_ldisc.read             = hci_uart_tty_read;
 844         hci_uart_ldisc.write            = hci_uart_tty_write;
 845         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 846         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 847         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 848         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 849         hci_uart_ldisc.owner            = THIS_MODULE;
 850
 851         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 852         if (err) {
 853                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 854                 return err;
 855         }
 856
 857 #ifdef CONFIG_BT_HCIUART_H4
 858         h4_init();
 859 #endif
 860 #ifdef CONFIG_BT_HCIUART_BCSP
 861         bcsp_init();
 862 #endif
 863 #ifdef CONFIG_BT_HCIUART_LL
 864         ll_init();
 865 #endif
 866 #ifdef CONFIG_BT_HCIUART_ATH3K
 867         ath_init();
 868 #endif
 869 #ifdef CONFIG_BT_HCIUART_3WIRE
 870         h5_init();
 871 #endif
 872 #ifdef CONFIG_BT_HCIUART_INTEL
 873         intel_init();
 874 #endif
 875 #ifdef CONFIG_BT_HCIUART_BCM
 876         bcm_init();
 877 #endif
 878 #ifdef CONFIG_BT_HCIUART_QCA
 879         qca_init();
 880 #endif
 881 #ifdef CONFIG_BT_HCIUART_AG6XX
 882         ag6xx_init();
 883 #endif
 884 #ifdef CONFIG_BT_HCIUART_MRVL
 885         mrvl_init();
 886 #endif
 887
 888         return 0;
 889 }
 890
 891 static void __exit hci_uart_exit(void)
 892 {
 893         int err;
 894
 895 #ifdef CONFIG_BT_HCIUART_H4
 896         h4_deinit();
 897 #endif
 898 #ifdef CONFIG_BT_HCIUART_BCSP
 899         bcsp_deinit();
 900 #endif
 901 #ifdef CONFIG_BT_HCIUART_LL
 902         ll_deinit();
 903 #endif
 904 #ifdef CONFIG_BT_HCIUART_ATH3K
 905         ath_deinit();
 906 #endif
 907 #ifdef CONFIG_BT_HCIUART_3WIRE
 908         h5_deinit();
 909 #endif
 910 #ifdef CONFIG_BT_HCIUART_INTEL
 911         intel_deinit();
 912 #endif
 913 #ifdef CONFIG_BT_HCIUART_BCM
 914         bcm_deinit();
 915 #endif
 916 #ifdef CONFIG_BT_HCIUART_QCA
 917         qca_deinit();
 918 #endif
 919 #ifdef CONFIG_BT_HCIUART_AG6XX
 920         ag6xx_deinit();
 921 #endif
 922 #ifdef CONFIG_BT_HCIUART_MRVL
 923         mrvl_deinit();
 924 #endif
 925
 926         /* Release tty registration of line discipline */
 927         err = tty_unregister_ldisc(N_HCI);
 928         if (err)
 929                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 930 }
 931
 932 module_init(hci_uart_init);
 933 module_exit(hci_uart_exit);
 934
 935 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 936 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 937 MODULE_VERSION(VERSION);
 938 MODULE_LICENSE("GPL");
 939 MODULE_ALIAS_LDISC(N_HCI);