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 <[email protected]>
   7  *  Copyright (C) 2004-2005  Marcel Holtmann <[email protected]>
   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                 hdev = hu->hdev;
 211                 hu->hdev = NULL;
 212                 hci_free_dev(hdev);
 213                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 214                 hu->proto->close(hu);
 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 /* Flow control or un-flow control the device */
 301 void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
 302 {
 303         struct tty_struct *tty = hu->tty;
 304         struct ktermios ktermios;
 305         int status;
 306         unsigned int set = 0;
 307         unsigned int clear = 0;
 308
 309         if (hu->serdev) {
 310                 serdev_device_set_flow_control(hu->serdev, !enable);
 311                 serdev_device_set_rts(hu->serdev, !enable);
 312                 return;
 313         }
 314
 315         if (enable) {
 316                 /* Disable hardware flow control */
 317                 ktermios = tty->termios;
 318                 ktermios.c_cflag &= ~CRTSCTS;
 319                 status = tty_set_termios(tty, &ktermios);
 320                 BT_DBG("Disabling hardware flow control: %s",
 321                        status ? "failed" : "success");
 322
 323                 /* Clear RTS to prevent the device from sending */
 324                 /* Most UARTs need OUT2 to enable interrupts */
 325                 status = tty->driver->ops->tiocmget(tty);
 326                 BT_DBG("Current tiocm 0x%x", status);
 327
 328                 set &= ~(TIOCM_OUT2 | TIOCM_RTS);
 329                 clear = ~set;
 330                 set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 331                        TIOCM_OUT2 | TIOCM_LOOP;
 332                 clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
 333                          TIOCM_OUT2 | TIOCM_LOOP;
 334                 status = tty->driver->ops->tiocmset(tty, set, clear);
 335                 BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
 336         } else {
 337                 /* Set RTS to allow the device to send again */
 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("Setting RTS: %s", status ? "failed" : "success");
 349
 350                 /* Re-enable hardware flow control */
 351                 ktermios = tty->termios;
 352                 ktermios.c_cflag |= CRTSCTS;
 353                 status = tty_set_termios(tty, &ktermios);
 354                 BT_DBG("Enabling hardware flow control: %s",
 355                        status ? "failed" : "success");
 356         }
 357 }
 358
 359 void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
 360                          unsigned int oper_speed)
 361 {
 362         hu->init_speed = init_speed;
 363         hu->oper_speed = oper_speed;
 364 }
 365
 366 void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
 367 {
 368         struct tty_struct *tty = hu->tty;
 369         struct ktermios ktermios;
 370
 371         ktermios = tty->termios;
 372         ktermios.c_cflag &= ~CBAUD;
 373         tty_termios_encode_baud_rate(&ktermios, speed, speed);
 374
 375         /* tty_set_termios() return not checked as it is always 0 */
 376         tty_set_termios(tty, &ktermios);
 377
 378         BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
 379                tty->termios.c_ispeed, tty->termios.c_ospeed);
 380 }
 381
 382 static int hci_uart_setup(struct hci_dev *hdev)
 383 {
 384         struct hci_uart *hu = hci_get_drvdata(hdev);
 385         struct hci_rp_read_local_version *ver;
 386         struct sk_buff *skb;
 387         unsigned int speed;
 388         int err;
 389
 390         /* Init speed if any */
 391         if (hu->init_speed)
 392                 speed = hu->init_speed;
 393         else if (hu->proto->init_speed)
 394                 speed = hu->proto->init_speed;
 395         else
 396                 speed = 0;
 397
 398         if (speed)
 399                 hci_uart_set_baudrate(hu, speed);
 400
 401         /* Operational speed if any */
 402         if (hu->oper_speed)
 403                 speed = hu->oper_speed;
 404         else if (hu->proto->oper_speed)
 405                 speed = hu->proto->oper_speed;
 406         else
 407                 speed = 0;
 408
 409         if (hu->proto->set_baudrate && speed) {
 410                 err = hu->proto->set_baudrate(hu, speed);
 411                 if (!err)
 412                         hci_uart_set_baudrate(hu, speed);
 413         }
 414
 415         if (hu->proto->setup)
 416                 return hu->proto->setup(hu);
 417
 418         if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
 419                 return 0;
 420
 421         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 422                              HCI_INIT_TIMEOUT);
 423         if (IS_ERR(skb)) {
 424                 BT_ERR("%s: Reading local version information failed (%ld)",
 425                        hdev->name, PTR_ERR(skb));
 426                 return 0;
 427         }
 428
 429         if (skb->len != sizeof(*ver)) {
 430                 BT_ERR("%s: Event length mismatch for version information",
 431                        hdev->name);
 432                 goto done;
 433         }
 434
 435         ver = (struct hci_rp_read_local_version *)skb->data;
 436
 437         switch (le16_to_cpu(ver->manufacturer)) {
 438 #ifdef CONFIG_BT_HCIUART_INTEL
 439         case 2:
 440                 hdev->set_bdaddr = btintel_set_bdaddr;
 441                 btintel_check_bdaddr(hdev);
 442                 break;
 443 #endif
 444 #ifdef CONFIG_BT_HCIUART_BCM
 445         case 15:
 446                 hdev->set_bdaddr = btbcm_set_bdaddr;
 447                 btbcm_check_bdaddr(hdev);
 448                 break;
 449 #endif
 450         }
 451
 452 done:
 453         kfree_skb(skb);
 454         return 0;
 455 }
 456
 457 /* ------ LDISC part ------ */
 458 /* hci_uart_tty_open
 459  *
 460  *     Called when line discipline changed to HCI_UART.
 461  *
 462  * Arguments:
 463  *     tty    pointer to tty info structure
 464  * Return Value:
 465  *     0 if success, otherwise error code
 466  */
 467 static int hci_uart_tty_open(struct tty_struct *tty)
 468 {
 469         struct hci_uart *hu;
 470
 471         BT_DBG("tty %p", tty);
 472
 473         /* Error if the tty has no write op instead of leaving an exploitable
 474          * hole
 475          */
 476         if (tty->ops->write == NULL)
 477                 return -EOPNOTSUPP;
 478
 479         hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
 480         if (!hu) {
 481                 BT_ERR("Can't allocate control structure");
 482                 return -ENFILE;
 483         }
 484
 485         tty->disc_data = hu;
 486         hu->tty = tty;
 487         tty->receive_room = 65536;
 488
 489         /* disable alignment support by default */
 490         hu->alignment = 1;
 491         hu->padding = 0;
 492
 493         INIT_WORK(&hu->init_ready, hci_uart_init_work);
 494         INIT_WORK(&hu->write_work, hci_uart_write_work);
 495
 496         percpu_init_rwsem(&hu->proto_lock);
 497
 498         /* Flush any pending characters in the driver */
 499         tty_driver_flush_buffer(tty);
 500
 501         return 0;
 502 }
 503
 504 /* hci_uart_tty_close()
 505  *
 506  *    Called when the line discipline is changed to something
 507  *    else, the tty is closed, or the tty detects a hangup.
 508  */
 509 static void hci_uart_tty_close(struct tty_struct *tty)
 510 {
 511         struct hci_uart *hu = tty->disc_data;
 512         struct hci_dev *hdev;
 513
 514         BT_DBG("tty %p", tty);
 515
 516         /* Detach from the tty */
 517         tty->disc_data = NULL;
 518
 519         if (!hu)
 520                 return;
 521
 522         hdev = hu->hdev;
 523         if (hdev)
 524                 hci_uart_close(hdev);
 525
 526         if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 527                 percpu_down_write(&hu->proto_lock);
 528                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 529                 percpu_up_write(&hu->proto_lock);
 530
 531                 cancel_work_sync(&hu->write_work);
 532
 533                 if (hdev) {
 534                         if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 535                                 hci_unregister_dev(hdev);
 536                         hci_free_dev(hdev);
 537                 }
 538                 hu->proto->close(hu);
 539         }
 540         clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 541
 542         kfree(hu);
 543 }
 544
 545 /* hci_uart_tty_wakeup()
 546  *
 547  *    Callback for transmit wakeup. Called when low level
 548  *    device driver can accept more send data.
 549  *
 550  * Arguments:        tty    pointer to associated tty instance data
 551  * Return Value:    None
 552  */
 553 static void hci_uart_tty_wakeup(struct tty_struct *tty)
 554 {
 555         struct hci_uart *hu = tty->disc_data;
 556
 557         BT_DBG("");
 558
 559         if (!hu)
 560                 return;
 561
 562         clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 563
 564         if (tty != hu->tty)
 565                 return;
 566
 567         if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 568                 hci_uart_tx_wakeup(hu);
 569 }
 570
 571 /* hci_uart_tty_receive()
 572  *
 573  *     Called by tty low level driver when receive data is
 574  *     available.
 575  *
 576  * Arguments:  tty          pointer to tty isntance data
 577  *             data         pointer to received data
 578  *             flags        pointer to flags for data
 579  *             count        count of received data in bytes
 580  *
 581  * Return Value:    None
 582  */
 583 static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 584                                  char *flags, int count)
 585 {
 586         struct hci_uart *hu = tty->disc_data;
 587
 588         if (!hu || tty != hu->tty)
 589                 return;
 590
 591         percpu_down_read(&hu->proto_lock);
 592
 593         if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
 594                 percpu_up_read(&hu->proto_lock);
 595                 return;
 596         }
 597
 598         /* It does not need a lock here as it is already protected by a mutex in
 599          * tty caller
 600          */
 601         hu->proto->recv(hu, data, count);
 602         percpu_up_read(&hu->proto_lock);
 603
 604         if (hu->hdev)
 605                 hu->hdev->stat.byte_rx += count;
 606
 607         tty_unthrottle(tty);
 608 }
 609
 610 static int hci_uart_register_dev(struct hci_uart *hu)
 611 {
 612         struct hci_dev *hdev;
 613
 614         BT_DBG("");
 615
 616         /* Initialize and register HCI device */
 617         hdev = hci_alloc_dev();
 618         if (!hdev) {
 619                 BT_ERR("Can't allocate HCI device");
 620                 return -ENOMEM;
 621         }
 622
 623         hu->hdev = hdev;
 624
 625         hdev->bus = HCI_UART;
 626         hci_set_drvdata(hdev, hu);
 627
 628         /* Only when vendor specific setup callback is provided, consider
 629          * the manufacturer information valid. This avoids filling in the
 630          * value for Ericsson when nothing is specified.
 631          */
 632         if (hu->proto->setup)
 633                 hdev->manufacturer = hu->proto->manufacturer;
 634
 635         hdev->open  = hci_uart_open;
 636         hdev->close = hci_uart_close;
 637         hdev->flush = hci_uart_flush;
 638         hdev->send  = hci_uart_send_frame;
 639         hdev->setup = hci_uart_setup;
 640         SET_HCIDEV_DEV(hdev, hu->tty->dev);
 641
 642         if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
 643                 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
 644
 645         if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
 646                 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
 647
 648         if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
 649                 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 650
 651         if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
 652                 hdev->dev_type = HCI_AMP;
 653         else
 654                 hdev->dev_type = HCI_PRIMARY;
 655
 656         if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 657                 return 0;
 658
 659         if (hci_register_dev(hdev) < 0) {
 660                 BT_ERR("Can't register HCI device");
 661                 hu->hdev = NULL;
 662                 hci_free_dev(hdev);
 663                 return -ENODEV;
 664         }
 665
 666         set_bit(HCI_UART_REGISTERED, &hu->flags);
 667
 668         return 0;
 669 }
 670
 671 static int hci_uart_set_proto(struct hci_uart *hu, int id)
 672 {
 673         const struct hci_uart_proto *p;
 674         int err;
 675
 676         p = hci_uart_get_proto(id);
 677         if (!p)
 678                 return -EPROTONOSUPPORT;
 679
 680         err = p->open(hu);
 681         if (err)
 682                 return err;
 683
 684         hu->proto = p;
 685         set_bit(HCI_UART_PROTO_READY, &hu->flags);
 686
 687         err = hci_uart_register_dev(hu);
 688         if (err) {
 689                 clear_bit(HCI_UART_PROTO_READY, &hu->flags);
 690                 p->close(hu);
 691                 return err;
 692         }
 693
 694         return 0;
 695 }
 696
 697 static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
 698 {
 699         unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
 700                                     BIT(HCI_UART_RESET_ON_INIT) |
 701                                     BIT(HCI_UART_CREATE_AMP) |
 702                                     BIT(HCI_UART_INIT_PENDING) |
 703                                     BIT(HCI_UART_EXT_CONFIG) |
 704                                     BIT(HCI_UART_VND_DETECT);
 705
 706         if (flags & ~valid_flags)
 707                 return -EINVAL;
 708
 709         hu->hdev_flags = flags;
 710
 711         return 0;
 712 }
 713
 714 /* hci_uart_tty_ioctl()
 715  *
 716  *    Process IOCTL system call for the tty device.
 717  *
 718  * Arguments:
 719  *
 720  *    tty        pointer to tty instance data
 721  *    file       pointer to open file object for device
 722  *    cmd        IOCTL command code
 723  *    arg        argument for IOCTL call (cmd dependent)
 724  *
 725  * Return Value:    Command dependent
 726  */
 727 static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
 728                               unsigned int cmd, unsigned long arg)
 729 {
 730         struct hci_uart *hu = tty->disc_data;
 731         int err = 0;
 732
 733         BT_DBG("");
 734
 735         /* Verify the status of the device */
 736         if (!hu)
 737                 return -EBADF;
 738
 739         switch (cmd) {
 740         case HCIUARTSETPROTO:
 741                 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
 742                         err = hci_uart_set_proto(hu, arg);
 743                         if (err)
 744                                 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 745                 } else
 746                         err = -EBUSY;
 747                 break;
 748
 749         case HCIUARTGETPROTO:
 750                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 751                         err = hu->proto->id;
 752                 else
 753                         err = -EUNATCH;
 754                 break;
 755
 756         case HCIUARTGETDEVICE:
 757                 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
 758                         err = hu->hdev->id;
 759                 else
 760                         err = -EUNATCH;
 761                 break;
 762
 763         case HCIUARTSETFLAGS:
 764                 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
 765                         err = -EBUSY;
 766                 else
 767                         err = hci_uart_set_flags(hu, arg);
 768                 break;
 769
 770         case HCIUARTGETFLAGS:
 771                 err = hu->hdev_flags;
 772                 break;
 773
 774         default:
 775                 err = n_tty_ioctl_helper(tty, file, cmd, arg);
 776                 break;
 777         }
 778
 779         return err;
 780 }
 781
 782 /*
 783  * We don't provide read/write/poll interface for user space.
 784  */
 785 static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
 786                                  unsigned char __user *buf, size_t nr)
 787 {
 788         return 0;
 789 }
 790
 791 static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 792                                   const unsigned char *data, size_t count)
 793 {
 794         return 0;
 795 }
 796
 797 static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
 798                                       struct file *filp, poll_table *wait)
 799 {
 800         return 0;
 801 }
 802
 803 static int __init hci_uart_init(void)
 804 {
 805         static struct tty_ldisc_ops hci_uart_ldisc;
 806         int err;
 807
 808         BT_INFO("HCI UART driver ver %s", VERSION);
 809
 810         /* Register the tty discipline */
 811
 812         memset(&hci_uart_ldisc, 0, sizeof(hci_uart_ldisc));
 813         hci_uart_ldisc.magic            = TTY_LDISC_MAGIC;
 814         hci_uart_ldisc.name             = "n_hci";
 815         hci_uart_ldisc.open             = hci_uart_tty_open;
 816         hci_uart_ldisc.close            = hci_uart_tty_close;
 817         hci_uart_ldisc.read             = hci_uart_tty_read;
 818         hci_uart_ldisc.write            = hci_uart_tty_write;
 819         hci_uart_ldisc.ioctl            = hci_uart_tty_ioctl;
 820         hci_uart_ldisc.poll             = hci_uart_tty_poll;
 821         hci_uart_ldisc.receive_buf      = hci_uart_tty_receive;
 822         hci_uart_ldisc.write_wakeup     = hci_uart_tty_wakeup;
 823         hci_uart_ldisc.owner            = THIS_MODULE;
 824
 825         err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
 826         if (err) {
 827                 BT_ERR("HCI line discipline registration failed. (%d)", err);
 828                 return err;
 829         }
 830
 831 #ifdef CONFIG_BT_HCIUART_H4
 832         h4_init();
 833 #endif
 834 #ifdef CONFIG_BT_HCIUART_BCSP
 835         bcsp_init();
 836 #endif
 837 #ifdef CONFIG_BT_HCIUART_LL
 838         ll_init();
 839 #endif
 840 #ifdef CONFIG_BT_HCIUART_ATH3K
 841         ath_init();
 842 #endif
 843 #ifdef CONFIG_BT_HCIUART_3WIRE
 844         h5_init();
 845 #endif
 846 #ifdef CONFIG_BT_HCIUART_INTEL
 847         intel_init();
 848 #endif
 849 #ifdef CONFIG_BT_HCIUART_BCM
 850         bcm_init();
 851 #endif
 852 #ifdef CONFIG_BT_HCIUART_QCA
 853         qca_init();
 854 #endif
 855 #ifdef CONFIG_BT_HCIUART_AG6XX
 856         ag6xx_init();
 857 #endif
 858 #ifdef CONFIG_BT_HCIUART_MRVL
 859         mrvl_init();
 860 #endif
 861
 862         return 0;
 863 }
 864
 865 static void __exit hci_uart_exit(void)
 866 {
 867         int err;
 868
 869 #ifdef CONFIG_BT_HCIUART_H4
 870         h4_deinit();
 871 #endif
 872 #ifdef CONFIG_BT_HCIUART_BCSP
 873         bcsp_deinit();
 874 #endif
 875 #ifdef CONFIG_BT_HCIUART_LL
 876         ll_deinit();
 877 #endif
 878 #ifdef CONFIG_BT_HCIUART_ATH3K
 879         ath_deinit();
 880 #endif
 881 #ifdef CONFIG_BT_HCIUART_3WIRE
 882         h5_deinit();
 883 #endif
 884 #ifdef CONFIG_BT_HCIUART_INTEL
 885         intel_deinit();
 886 #endif
 887 #ifdef CONFIG_BT_HCIUART_BCM
 888         bcm_deinit();
 889 #endif
 890 #ifdef CONFIG_BT_HCIUART_QCA
 891         qca_deinit();
 892 #endif
 893 #ifdef CONFIG_BT_HCIUART_AG6XX
 894         ag6xx_deinit();
 895 #endif
 896 #ifdef CONFIG_BT_HCIUART_MRVL
 897         mrvl_deinit();
 898 #endif
 899
 900         /* Release tty registration of line discipline */
 901         err = tty_unregister_ldisc(N_HCI);
 902         if (err)
 903                 BT_ERR("Can't unregister HCI line discipline (%d)", err);
 904 }
 905
 906 module_init(hci_uart_init);
 907 module_exit(hci_uart_exit);
 908
 909 MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
 910 MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
 911 MODULE_VERSION(VERSION);
 912 MODULE_LICENSE("GPL");
 913 MODULE_ALIAS_LDISC(N_HCI);