linux/drivers/bluetooth/hci_ldisc.c
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   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
  54static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
  55
  56int 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
  71int 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
  84static 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
  92static 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
 112static 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
 124int 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
 138static 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
 149restart:
 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
 175static 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
 194int 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 */
 206static 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 */
 215static 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_READY, &hu->flags))
 231                hu->proto->flush(hu);
 232
 233        return 0;
 234}
 235
 236/* Close device */
 237static 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 */
 247static 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 */
 262void 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
 314void 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
 321void 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
 340void 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
 356static 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
 426done:
 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 */
 441static 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 */
 466        tty_driver_flush_buffer(tty);
 467
 468        return 0;
 469}
 470
 471/* hci_uart_tty_close()
 472 *
 473 *    Called when the line discipline is changed to something
 474 *    else, the tty is closed, or the tty detects a hangup.
 475 */
 476static void hci_uart_tty_close(struct tty_struct *tty)
 477{
 478        struct hci_uart *hu = tty->disc_data;
 479        struct hci_dev *hdev;
 480
 481        BT_DBG("tty %p", tty);
 482
 483        /* Detach from the tty */
 484        tty->disc_data = NULL;
 485
 486        if (!hu)
 487                return;
 488
 489        hdev = hu->hdev;
 490        if (hdev)
 491                hci_uart_close(hdev);
 492
 493        cancel_work_sync(&hu->write_work);
 494
 495        if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 496                if (hdev) {
 497                        if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 498                                hci_unregister_dev(hdev);
 499                        hci_free_dev(hdev);
 500                }
 501                hu->proto->close(hu);
 502        }
 503        clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 504
 505        kfree(hu);
 506}
 507
 508/* hci_uart_tty_wakeup()
 509 *
 510 *    Callback for transmit wakeup. Called when low level
 511 *    device driver can accept more send data.
 512 *
 513 * Arguments:        tty    pointer to associated tty instance data
 514 * Return Value:    None
 515 */
 516static void hci_uart_tty_wakeup(struct tty_struct *tty)
 517{
 518        struct hci_uart *hu = tty->disc_data;
 519
 520        BT_DBG("");
 521
 522        if (!hu)
 523                return;
 524
 525        clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 526
 527        if (tty != hu->tty)
 528                return;
 529
 530        if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 531                hci_uart_tx_wakeup(hu);
 532}
 533
 534/* hci_uart_tty_receive()
 535 *
 536 *     Called by tty low level driver when receive data is
 537 *     available.
 538 *
 539 * Arguments:  tty          pointer to tty isntance data
 540 *             data         pointer to received data
 541 *             flags        pointer to flags for data
 542 *             count        count of received data in bytes
 543 *
 544 * Return Value:    None
 545 */
 546static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 547                                 char *flags, int count)
 548{
 549        struct hci_uart *hu = tty->disc_data;
 550
 551        if (!hu || tty != hu->tty)
 552                return;
 553
 554        if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
 555                return;
 556
 557        /* It does not need a lock here as it is already protected by a mutex in
 558         * tty caller
 559         */
 560        hu->proto->recv(hu, data, count);
 561
 562        if (hu->hdev)
 563                hu->hdev->stat.byte_rx += count;
 564
 565        tty_unthrottle(tty);
 566}
 567
 568static int hci_uart_register_dev(struct hci_uart *hu)
 569{
 570        struct hci_dev *hdev;
 571
 572        BT_DBG("");
 573
 574        /* Initialize and register HCI device */
 575        hdev = hci_alloc_dev();
 576        if (!hdev) {
 577                BT_ERR("Can't allocate HCI device");
 578                return -ENOMEM;
 579        }
 580
 581        hu->hdev = hdev;
 582
 583        hdev->bus = HCI_UART;
 584        hci_set_drvdata(hdev, hu);
 585
 586        /* Only when vendor specific setup callback is provided, consider
 587         * the manufacturer information valid. This avoids filling in the
 588         * value for Ericsson when nothing is specified.
 589         */
 590        if (hu->proto->setup)
 591                hdev->manufacturer = hu->proto->manufacturer;
 592
 593        hdev->open  = hci_uart_open;
 594        hdev->close = hci_uart_close;
 595        hdev->flush = hci_uart_flush;
 596        hdev->send  = hci_uart_send_frame;
 597        hdev->setup = hci_uart_setup;
 598        SET_HCIDEV_DEV(hdev, hu->tty->dev);
 599
 600        if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 601                set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 602
 603        if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 604                set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 605
 606        if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 607                set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 608
 609        if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 610                hdev->dev_type = HCI_AMP;
 611        else
 612                hdev->dev_type = HCI_PRIMARY;
 613
 614        if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 615                return 0;
 616
 617        if (hci_register_dev(hdev) < 0) {
 618                BT_ERR("Can't register HCI device");
 619                hci_free_dev(hdev);
 620                return -ENODEV;
 621        }
 622
 623        set_bit(HCI_UART_REGISTERED, &hu->flags);
 624
 625        return 0;
 626}
 627
 628static int hci_uart_set_proto(struct hci_uart *hu, int id)
 629{
 630        const struct hci_uart_proto *p;
 631        int err;
 632
 633        p = hci_uart_get_proto(id);
 634        if (!p)
 635                return -EPROTONOSUPPORT;
 636
 637        err = p->open(hu);
 638        if (err)
 639                return err;
 640
 641        hu->proto = p;
 642        set_bit(HCI_UART_PROTO_READY, &hu->flags);
 643
 644        err = hci_uart_register_dev(hu);
 645        if (err) {
 646                clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 647                p->close(hu);
 648                return err;
 649        }
 650
 651        return 0;
 652}
 653
 654static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 655{
 656        unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 657                                    BIT(HCI_UART_RESET_ON_INIT) |
 658                                    BIT(HCI_UART_CREATE_AMP) |
 659                                    BIT(HCI_UART_INIT_PENDING) |
 660                                    BIT(HCI_UART_EXT_CONFIG) |
 661                                    BIT(HCI_UART_VND_DETECT);
 662
 663        if (flags & ~valid_flags)
 664                return -EINVAL;
 665
 666        hu->hdev_flags = flags;
 667
 668        return 0;
 669}
 670
 671/* hci_uart_tty_ioctl()
 672 *
 673 *    Process IOCTL system call for the tty device.
 674 *
 675 * Arguments:
 676 *
 677 *    tty        pointer to tty instance data
 678 *    file       pointer to open file object for device
 679 *    cmd        IOCTL command code
 680 *    arg        argument for IOCTL call (cmd dependent)
 681 *
 682 * Return Value:    Command dependent
 683 */
 684static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 685                              unsigned int cmd, unsigned long arg)
 686{
 687        struct hci_uart *hu = tty->disc_data;
 688        int err = 0;
 689
 690        BT_DBG("");
 691
 692        /* Verify the status of the device */
 693        if (!hu)
 694                return -EBADF;
 695
 696        switch (cmd) {
 697        case HCIUARTSETPROTO:
 698                if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 699                        err = hci_uart_set_proto(hu, arg);
 700                        if (err)
 701                                clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 702                } else
 703                        err = -EBUSY;
 704                break;
 705
 706        case HCIUARTGETPROTO:
 707                if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 708                        err = hu->proto->id;
 709                else
 710                        err = -EUNATCH;
 711                break;
 712
 713        case HCIUARTGETDEVICE:
 714                if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 715                        err = hu->hdev->id;
 716                else
 717                        err = -EUNATCH;
 718                break;
 719
 720        case HCIUARTSETFLAGS:
 721                if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 722                        err = -EBUSY;
 723                else
 724                        err = hci_uart_set_flags(hu, arg);
 725                break;
 726
 727        case HCIUARTGETFLAGS:
 728                err = hu->hdev_flags;
 729                break;
 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 */
 742static 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
 748static 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
 754static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
 755                                      struct file *filp, poll_table *wait)
 756{
 757        return 0;
 758}
 759
 760static 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#ifdef CONFIG_BT_HCIUART_AG6XX
 813        ag6xx_init();
 814#endif
 815#ifdef CONFIG_BT_HCIUART_MRVL
 816        mrvl_init();
 817#endif
 818
 819        return 0;
 820}
 821
 822static void __exit hci_uart_exit(void)
 823{
 824        int err;
 825
 826#ifdef CONFIG_BT_HCIUART_H4
 827        h4_deinit();
 828#endif
 829#ifdef CONFIG_BT_HCIUART_BCSP
 830        bcsp_deinit();
 831#endif
 832#ifdef CONFIG_BT_HCIUART_LL
 833        ll_deinit();
 834#endif
 835#ifdef CONFIG_BT_HCIUART_ATH3K
 836        ath_deinit();
 837#endif
 838#ifdef CONFIG_BT_HCIUART_3WIRE
 839        h5_deinit();
 840#endif
 841#ifdef CONFIG_BT_HCIUART_INTEL
 842        intel_deinit();
 843#endif
 844#ifdef CONFIG_BT_HCIUART_BCM
 845        bcm_deinit();
 846#endif
 847#ifdef CONFIG_BT_HCIUART_QCA
 848        qca_deinit();
 849#endif
 850#ifdef CONFIG_BT_HCIUART_AG6XX
 851        ag6xx_deinit();
 852#endif
 853#ifdef CONFIG_BT_HCIUART_MRVL
 854        mrvl_deinit();
 855#endif
 856
 857        /* Release tty registration of line discipline */
 858        err = tty_unregister_ldisc(N_HCI);
 859        if (err)
 860                BT_ERR("Can't unregister HCI line discipline (%d)", err);
 861}
 862
 863module_init(hci_uart_init);
 864module_exit(hci_uart_exit);
 865
 866MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 867MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 868MODULE_VERSION(VERSION);
 869MODULE_LICENSE("GPL");
 870MODULE_ALIAS_LDISC(N_HCI);
 871
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