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