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