drivers/bluetooth/hci_intel.c

   1 /*
   2  *
   3  *  Bluetooth HCI UART driver for Intel devices
   4  *
   5  *  Copyright (C) 2015  Intel Corporation
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/firmware.h>
  28 #include <linux/wait.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32
  33 #include "hci_uart.h"
  34 #include "btintel.h"
  35
  36 #define STATE_BOOTLOADER        0
  37 #define STATE_DOWNLOADING       1
  38 #define STATE_FIRMWARE_LOADED   2
  39 #define STATE_FIRMWARE_FAILED   3
  40 #define STATE_BOOTING           4
  41
  42 struct intel_data {
  43         struct sk_buff *rx_skb;
  44         struct sk_buff_head txq;
  45         unsigned long flags;
  46 };
  47
  48 static u8 intel_convert_speed(unsigned int speed)
  49 {
  50         switch (speed) {
  51         case 9600:
  52                 return 0x00;
  53         case 19200:
  54                 return 0x01;
  55         case 38400:
  56                 return 0x02;
  57         case 57600:
  58                 return 0x03;
  59         case 115200:
  60                 return 0x04;
  61         case 230400:
  62                 return 0x05;
  63         case 460800:
  64                 return 0x06;
  65         case 921600:
  66                 return 0x07;
  67         case 1843200:
  68                 return 0x08;
  69         case 3250000:
  70                 return 0x09;
  71         case 2000000:
  72                 return 0x0a;
  73         case 3000000:
  74                 return 0x0b;
  75         default:
  76                 return 0xff;
  77         }
  78 }
  79
  80 static int intel_open(struct hci_uart *hu)
  81 {
  82         struct intel_data *intel;
  83
  84         BT_DBG("hu %p", hu);
  85
  86         intel = kzalloc(sizeof(*intel), GFP_KERNEL);
  87         if (!intel)
  88                 return -ENOMEM;
  89
  90         skb_queue_head_init(&intel->txq);
  91
  92         hu->priv = intel;
  93         return 0;
  94 }
  95
  96 static int intel_close(struct hci_uart *hu)
  97 {
  98         struct intel_data *intel = hu->priv;
  99
 100         BT_DBG("hu %p", hu);
 101
 102         skb_queue_purge(&intel->txq);
 103         kfree_skb(intel->rx_skb);
 104         kfree(intel);
 105
 106         hu->priv = NULL;
 107         return 0;
 108 }
 109
 110 static int intel_flush(struct hci_uart *hu)
 111 {
 112         struct intel_data *intel = hu->priv;
 113
 114         BT_DBG("hu %p", hu);
 115
 116         skb_queue_purge(&intel->txq);
 117
 118         return 0;
 119 }
 120
 121 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
 122 {
 123         struct sk_buff *skb;
 124         struct hci_event_hdr *hdr;
 125         struct hci_ev_cmd_complete *evt;
 126
 127         skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
 128         if (!skb)
 129                 return -ENOMEM;
 130
 131         hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
 132         hdr->evt = HCI_EV_CMD_COMPLETE;
 133         hdr->plen = sizeof(*evt) + 1;
 134
 135         evt = (struct hci_ev_cmd_complete *)skb_put(skb, sizeof(*evt));
 136         evt->ncmd = 0x01;
 137         evt->opcode = cpu_to_le16(opcode);
 138
 139         *skb_put(skb, 1) = 0x00;
 140
 141         bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
 142
 143         return hci_recv_frame(hdev, skb);
 144 }
 145
 146 static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed)
 147 {
 148         struct intel_data *intel = hu->priv;
 149         struct hci_dev *hdev = hu->hdev;
 150         u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 };
 151         struct sk_buff *skb;
 152
 153         BT_INFO("%s: Change controller speed to %d", hdev->name, speed);
 154
 155         speed_cmd[3] = intel_convert_speed(speed);
 156         if (speed_cmd[3] == 0xff) {
 157                 BT_ERR("%s: Unsupported speed", hdev->name);
 158                 return -EINVAL;
 159         }
 160
 161         /* Device will not accept speed change if Intel version has not been
 162          * previously requested.
 163          */
 164         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 165         if (IS_ERR(skb)) {
 166                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 167                        hdev->name, PTR_ERR(skb));
 168                 return PTR_ERR(skb);
 169         }
 170         kfree_skb(skb);
 171
 172         skb = bt_skb_alloc(sizeof(speed_cmd), GFP_KERNEL);
 173         if (!skb) {
 174                 BT_ERR("%s: Failed to allocate memory for baudrate packet",
 175                        hdev->name);
 176                 return -ENOMEM;
 177         }
 178
 179         memcpy(skb_put(skb, sizeof(speed_cmd)), speed_cmd, sizeof(speed_cmd));
 180         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 181
 182         hci_uart_set_flow_control(hu, true);
 183
 184         skb_queue_tail(&intel->txq, skb);
 185         hci_uart_tx_wakeup(hu);
 186
 187         /* wait 100ms to change baudrate on controller side */
 188         msleep(100);
 189
 190         hci_uart_set_baudrate(hu, speed);
 191         hci_uart_set_flow_control(hu, false);
 192
 193         return 0;
 194 }
 195
 196 static int intel_setup(struct hci_uart *hu)
 197 {
 198         static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
 199                                           0x00, 0x08, 0x04, 0x00 };
 200         struct intel_data *intel = hu->priv;
 201         struct hci_dev *hdev = hu->hdev;
 202         struct sk_buff *skb;
 203         struct intel_version *ver;
 204         struct intel_boot_params *params;
 205         const struct firmware *fw;
 206         const u8 *fw_ptr;
 207         char fwname[64];
 208         u32 frag_len;
 209         ktime_t calltime, delta, rettime;
 210         unsigned long long duration;
 211         unsigned int init_speed, oper_speed;
 212         int speed_change = 0;
 213         int err;
 214
 215         BT_DBG("%s", hdev->name);
 216
 217         hu->hdev->set_bdaddr = btintel_set_bdaddr;
 218
 219         calltime = ktime_get();
 220
 221         if (hu->init_speed)
 222                 init_speed = hu->init_speed;
 223         else
 224                 init_speed = hu->proto->init_speed;
 225
 226         if (hu->oper_speed)
 227                 oper_speed = hu->oper_speed;
 228         else
 229                 oper_speed = hu->proto->oper_speed;
 230
 231         if (oper_speed && init_speed && oper_speed != init_speed)
 232                 speed_change = 1;
 233
 234         set_bit(STATE_BOOTLOADER, &intel->flags);
 235
 236         /* Read the Intel version information to determine if the device
 237          * is in bootloader mode or if it already has operational firmware
 238          * loaded.
 239          */
 240         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 241         if (IS_ERR(skb)) {
 242                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 243                        hdev->name, PTR_ERR(skb));
 244                 return PTR_ERR(skb);
 245         }
 246
 247         if (skb->len != sizeof(*ver)) {
 248                 BT_ERR("%s: Intel version event size mismatch", hdev->name);
 249                 kfree_skb(skb);
 250                 return -EILSEQ;
 251         }
 252
 253         ver = (struct intel_version *)skb->data;
 254         if (ver->status) {
 255                 BT_ERR("%s: Intel version command failure (%02x)",
 256                        hdev->name, ver->status);
 257                 err = -bt_to_errno(ver->status);
 258                 kfree_skb(skb);
 259                 return err;
 260         }
 261
 262         /* The hardware platform number has a fixed value of 0x37 and
 263          * for now only accept this single value.
 264          */
 265         if (ver->hw_platform != 0x37) {
 266                 BT_ERR("%s: Unsupported Intel hardware platform (%u)",
 267                        hdev->name, ver->hw_platform);
 268                 kfree_skb(skb);
 269                 return -EINVAL;
 270         }
 271
 272         /* At the moment only the hardware variant iBT 3.0 (LnP/SfP) is
 273          * supported by this firmware loading method. This check has been
 274          * put in place to ensure correct forward compatibility options
 275          * when newer hardware variants come along.
 276          */
 277         if (ver->hw_variant != 0x0b) {
 278                 BT_ERR("%s: Unsupported Intel hardware variant (%u)",
 279                        hdev->name, ver->hw_variant);
 280                 kfree_skb(skb);
 281                 return -EINVAL;
 282         }
 283
 284         btintel_version_info(hdev, ver);
 285
 286         /* The firmware variant determines if the device is in bootloader
 287          * mode or is running operational firmware. The value 0x06 identifies
 288          * the bootloader and the value 0x23 identifies the operational
 289          * firmware.
 290          *
 291          * When the operational firmware is already present, then only
 292          * the check for valid Bluetooth device address is needed. This
 293          * determines if the device will be added as configured or
 294          * unconfigured controller.
 295          *
 296          * It is not possible to use the Secure Boot Parameters in this
 297          * case since that command is only available in bootloader mode.
 298          */
 299         if (ver->fw_variant == 0x23) {
 300                 kfree_skb(skb);
 301                 clear_bit(STATE_BOOTLOADER, &intel->flags);
 302                 btintel_check_bdaddr(hdev);
 303                 return 0;
 304         }
 305
 306         /* If the device is not in bootloader mode, then the only possible
 307          * choice is to return an error and abort the device initialization.
 308          */
 309         if (ver->fw_variant != 0x06) {
 310                 BT_ERR("%s: Unsupported Intel firmware variant (%u)",
 311                        hdev->name, ver->fw_variant);
 312                 kfree_skb(skb);
 313                 return -ENODEV;
 314         }
 315
 316         kfree_skb(skb);
 317
 318         /* Read the secure boot parameters to identify the operating
 319          * details of the bootloader.
 320          */
 321         skb = __hci_cmd_sync(hdev, 0xfc0d, 0, NULL, HCI_INIT_TIMEOUT);
 322         if (IS_ERR(skb)) {
 323                 BT_ERR("%s: Reading Intel boot parameters failed (%ld)",
 324                        hdev->name, PTR_ERR(skb));
 325                 return PTR_ERR(skb);
 326         }
 327
 328         if (skb->len != sizeof(*params)) {
 329                 BT_ERR("%s: Intel boot parameters size mismatch", hdev->name);
 330                 kfree_skb(skb);
 331                 return -EILSEQ;
 332         }
 333
 334         params = (struct intel_boot_params *)skb->data;
 335         if (params->status) {
 336                 BT_ERR("%s: Intel boot parameters command failure (%02x)",
 337                        hdev->name, params->status);
 338                 err = -bt_to_errno(params->status);
 339                 kfree_skb(skb);
 340                 return err;
 341         }
 342
 343         BT_INFO("%s: Device revision is %u", hdev->name,
 344                 le16_to_cpu(params->dev_revid));
 345
 346         BT_INFO("%s: Secure boot is %s", hdev->name,
 347                 params->secure_boot ? "enabled" : "disabled");
 348
 349         BT_INFO("%s: Minimum firmware build %u week %u %u", hdev->name,
 350                 params->min_fw_build_nn, params->min_fw_build_cw,
 351                 2000 + params->min_fw_build_yy);
 352
 353         /* It is required that every single firmware fragment is acknowledged
 354          * with a command complete event. If the boot parameters indicate
 355          * that this bootloader does not send them, then abort the setup.
 356          */
 357         if (params->limited_cce != 0x00) {
 358                 BT_ERR("%s: Unsupported Intel firmware loading method (%u)",
 359                        hdev->name, params->limited_cce);
 360                 kfree_skb(skb);
 361                 return -EINVAL;
 362         }
 363
 364         /* If the OTP has no valid Bluetooth device address, then there will
 365          * also be no valid address for the operational firmware.
 366          */
 367         if (!bacmp(&params->otp_bdaddr, BDADDR_ANY)) {
 368                 BT_INFO("%s: No device address configured", hdev->name);
 369                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 370         }
 371
 372         /* With this Intel bootloader only the hardware variant and device
 373          * revision information are used to select the right firmware.
 374          *
 375          * Currently this bootloader support is limited to hardware variant
 376          * iBT 3.0 (LnP/SfP) which is identified by the value 11 (0x0b).
 377          */
 378         snprintf(fwname, sizeof(fwname), "intel/ibt-11-%u.sfi",
 379                  le16_to_cpu(params->dev_revid));
 380
 381         err = request_firmware(&fw, fwname, &hdev->dev);
 382         if (err < 0) {
 383                 BT_ERR("%s: Failed to load Intel firmware file (%d)",
 384                        hdev->name, err);
 385                 kfree_skb(skb);
 386                 return err;
 387         }
 388
 389         BT_INFO("%s: Found device firmware: %s", hdev->name, fwname);
 390
 391         kfree_skb(skb);
 392
 393         if (fw->size < 644) {
 394                 BT_ERR("%s: Invalid size of firmware file (%zu)",
 395                        hdev->name, fw->size);
 396                 err = -EBADF;
 397                 goto done;
 398         }
 399
 400         set_bit(STATE_DOWNLOADING, &intel->flags);
 401
 402         /* Start the firmware download transaction with the Init fragment
 403          * represented by the 128 bytes of CSS header.
 404          */
 405         err = btintel_secure_send(hdev, 0x00, 128, fw->data);
 406         if (err < 0) {
 407                 BT_ERR("%s: Failed to send firmware header (%d)",
 408                        hdev->name, err);
 409                 goto done;
 410         }
 411
 412         /* Send the 256 bytes of public key information from the firmware
 413          * as the PKey fragment.
 414          */
 415         err = btintel_secure_send(hdev, 0x03, 256, fw->data + 128);
 416         if (err < 0) {
 417                 BT_ERR("%s: Failed to send firmware public key (%d)",
 418                        hdev->name, err);
 419                 goto done;
 420         }
 421
 422         /* Send the 256 bytes of signature information from the firmware
 423          * as the Sign fragment.
 424          */
 425         err = btintel_secure_send(hdev, 0x02, 256, fw->data + 388);
 426         if (err < 0) {
 427                 BT_ERR("%s: Failed to send firmware signature (%d)",
 428                        hdev->name, err);
 429                 goto done;
 430         }
 431
 432         fw_ptr = fw->data + 644;
 433         frag_len = 0;
 434
 435         while (fw_ptr - fw->data < fw->size) {
 436                 struct hci_command_hdr *cmd = (void *)(fw_ptr + frag_len);
 437
 438                 frag_len += sizeof(*cmd) + cmd->plen;
 439
 440                 BT_DBG("%s: patching %td/%zu", hdev->name,
 441                        (fw_ptr - fw->data), fw->size);
 442
 443                 /* The parameter length of the secure send command requires
 444                  * a 4 byte alignment. It happens so that the firmware file
 445                  * contains proper Intel_NOP commands to align the fragments
 446                  * as needed.
 447                  *
 448                  * Send set of commands with 4 byte alignment from the
 449                  * firmware data buffer as a single Data fragement.
 450                  */
 451                 if (frag_len % 4)
 452                         continue;
 453
 454                 /* Send each command from the firmware data buffer as
 455                  * a single Data fragment.
 456                  */
 457                 err = btintel_secure_send(hdev, 0x01, frag_len, fw_ptr);
 458                 if (err < 0) {
 459                         BT_ERR("%s: Failed to send firmware data (%d)",
 460                                hdev->name, err);
 461                         goto done;
 462                 }
 463
 464                 fw_ptr += frag_len;
 465                 frag_len = 0;
 466         }
 467
 468         set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
 469
 470         BT_INFO("%s: Waiting for firmware download to complete", hdev->name);
 471
 472         /* Before switching the device into operational mode and with that
 473          * booting the loaded firmware, wait for the bootloader notification
 474          * that all fragments have been successfully received.
 475          *
 476          * When the event processing receives the notification, then the
 477          * STATE_DOWNLOADING flag will be cleared.
 478          *
 479          * The firmware loading should not take longer than 5 seconds
 480          * and thus just timeout if that happens and fail the setup
 481          * of this device.
 482          */
 483         err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
 484                                   TASK_INTERRUPTIBLE,
 485                                   msecs_to_jiffies(5000));
 486         if (err == 1) {
 487                 BT_ERR("%s: Firmware loading interrupted", hdev->name);
 488                 err = -EINTR;
 489                 goto done;
 490         }
 491
 492         if (err) {
 493                 BT_ERR("%s: Firmware loading timeout", hdev->name);
 494                 err = -ETIMEDOUT;
 495                 goto done;
 496         }
 497
 498         if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
 499                 BT_ERR("%s: Firmware loading failed", hdev->name);
 500                 err = -ENOEXEC;
 501                 goto done;
 502         }
 503
 504         rettime = ktime_get();
 505         delta = ktime_sub(rettime, calltime);
 506         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 507
 508         BT_INFO("%s: Firmware loaded in %llu usecs", hdev->name, duration);
 509
 510 done:
 511         release_firmware(fw);
 512
 513         if (err < 0)
 514                 return err;
 515
 516         /* We need to restore the default speed before Intel reset */
 517         if (speed_change) {
 518                 err = intel_set_baudrate(hu, init_speed);
 519                 if (err)
 520                         return err;
 521         }
 522
 523         calltime = ktime_get();
 524
 525         set_bit(STATE_BOOTING, &intel->flags);
 526
 527         skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(reset_param), reset_param,
 528                              HCI_INIT_TIMEOUT);
 529         if (IS_ERR(skb))
 530                 return PTR_ERR(skb);
 531
 532         kfree_skb(skb);
 533
 534         /* The bootloader will not indicate when the device is ready. This
 535          * is done by the operational firmware sending bootup notification.
 536          *
 537          * Booting into operational firmware should not take longer than
 538          * 1 second. However if that happens, then just fail the setup
 539          * since something went wrong.
 540          */
 541         BT_INFO("%s: Waiting for device to boot", hdev->name);
 542
 543         err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
 544                                   TASK_INTERRUPTIBLE,
 545                                   msecs_to_jiffies(1000));
 546
 547         if (err == 1) {
 548                 BT_ERR("%s: Device boot interrupted", hdev->name);
 549                 return -EINTR;
 550         }
 551
 552         if (err) {
 553                 BT_ERR("%s: Device boot timeout", hdev->name);
 554                 return -ETIMEDOUT;
 555         }
 556
 557         rettime = ktime_get();
 558         delta = ktime_sub(rettime, calltime);
 559         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 560
 561         BT_INFO("%s: Device booted in %llu usecs", hdev->name, duration);
 562
 563         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
 564         if (IS_ERR(skb))
 565                 return PTR_ERR(skb);
 566         kfree_skb(skb);
 567
 568         if (speed_change) {
 569                 err = intel_set_baudrate(hu, oper_speed);
 570                 if (err)
 571                         return err;
 572         }
 573
 574         BT_INFO("%s: Setup complete", hdev->name);
 575
 576         clear_bit(STATE_BOOTLOADER, &intel->flags);
 577
 578         return 0;
 579 }
 580
 581 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 582 {
 583         struct hci_uart *hu = hci_get_drvdata(hdev);
 584         struct intel_data *intel = hu->priv;
 585         struct hci_event_hdr *hdr;
 586
 587         if (!test_bit(STATE_BOOTLOADER, &intel->flags))
 588                 goto recv;
 589
 590         hdr = (void *)skb->data;
 591
 592         /* When the firmware loading completes the device sends
 593          * out a vendor specific event indicating the result of
 594          * the firmware loading.
 595          */
 596         if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
 597             skb->data[2] == 0x06) {
 598                 if (skb->data[3] != 0x00)
 599                         set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
 600
 601                 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
 602                     test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
 603                         smp_mb__after_atomic();
 604                         wake_up_bit(&intel->flags, STATE_DOWNLOADING);
 605                 }
 606
 607         /* When switching to the operational firmware the device
 608          * sends a vendor specific event indicating that the bootup
 609          * completed.
 610          */
 611         } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
 612                    skb->data[2] == 0x02) {
 613                 if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
 614                         smp_mb__after_atomic();
 615                         wake_up_bit(&intel->flags, STATE_BOOTING);
 616                 }
 617         }
 618 recv:
 619         return hci_recv_frame(hdev, skb);
 620 }
 621
 622 static const struct h4_recv_pkt intel_recv_pkts[] = {
 623         { H4_RECV_ACL,   .recv = hci_recv_frame },
 624         { H4_RECV_SCO,   .recv = hci_recv_frame },
 625         { H4_RECV_EVENT, .recv = intel_recv_event },
 626 };
 627
 628 static int intel_recv(struct hci_uart *hu, const void *data, int count)
 629 {
 630         struct intel_data *intel = hu->priv;
 631
 632         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 633                 return -EUNATCH;
 634
 635         intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
 636                                     intel_recv_pkts,
 637                                     ARRAY_SIZE(intel_recv_pkts));
 638         if (IS_ERR(intel->rx_skb)) {
 639                 int err = PTR_ERR(intel->rx_skb);
 640                 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 641                 intel->rx_skb = NULL;
 642                 return err;
 643         }
 644
 645         return count;
 646 }
 647
 648 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 649 {
 650         struct intel_data *intel = hu->priv;
 651
 652         BT_DBG("hu %p skb %p", hu, skb);
 653
 654         skb_queue_tail(&intel->txq, skb);
 655
 656         return 0;
 657 }
 658
 659 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
 660 {
 661         struct intel_data *intel = hu->priv;
 662         struct sk_buff *skb;
 663
 664         skb = skb_dequeue(&intel->txq);
 665         if (!skb)
 666                 return skb;
 667
 668         if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
 669             (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)) {
 670                 struct hci_command_hdr *cmd = (void *)skb->data;
 671                 __u16 opcode = le16_to_cpu(cmd->opcode);
 672
 673                 /* When the 0xfc01 command is issued to boot into
 674                  * the operational firmware, it will actually not
 675                  * send a command complete event. To keep the flow
 676                  * control working inject that event here.
 677                  */
 678                 if (opcode == 0xfc01)
 679                         inject_cmd_complete(hu->hdev, opcode);
 680         }
 681
 682         /* Prepend skb with frame type */
 683         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 684
 685         return skb;
 686 }
 687
 688 static const struct hci_uart_proto intel_proto = {
 689         .id             = HCI_UART_INTEL,
 690         .name           = "Intel",
 691         .init_speed     = 115200,
 692         .oper_speed     = 3000000,
 693         .open           = intel_open,
 694         .close          = intel_close,
 695         .flush          = intel_flush,
 696         .setup          = intel_setup,
 697         .set_baudrate   = intel_set_baudrate,
 698         .recv           = intel_recv,
 699         .enqueue        = intel_enqueue,
 700         .dequeue        = intel_dequeue,
 701 };
 702
 703 int __init intel_init(void)
 704 {
 705         return hci_uart_register_proto(&intel_proto);
 706 }
 707
 708 int __exit intel_deinit(void)
 709 {
 710         return hci_uart_unregister_proto(&intel_proto);
 711 }