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/module.h>
  29 #include <linux/wait.h>
  30 #include <linux/tty.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/gpio/consumer.h>
  33 #include <linux/acpi.h>
  34
  35 #include <net/bluetooth/bluetooth.h>
  36 #include <net/bluetooth/hci_core.h>
  37
  38 #include "hci_uart.h"
  39 #include "btintel.h"
  40
  41 #define STATE_BOOTLOADER        0
  42 #define STATE_DOWNLOADING       1
  43 #define STATE_FIRMWARE_LOADED   2
  44 #define STATE_FIRMWARE_FAILED   3
  45 #define STATE_BOOTING           4
  46
  47 struct intel_device {
  48         struct list_head list;
  49         struct platform_device *pdev;
  50         struct gpio_desc *reset;
  51 };
  52
  53 static LIST_HEAD(intel_device_list);
  54 static DEFINE_SPINLOCK(intel_device_list_lock);
  55
  56 struct intel_data {
  57         struct sk_buff *rx_skb;
  58         struct sk_buff_head txq;
  59         unsigned long flags;
  60 };
  61
  62 static u8 intel_convert_speed(unsigned int speed)
  63 {
  64         switch (speed) {
  65         case 9600:
  66                 return 0x00;
  67         case 19200:
  68                 return 0x01;
  69         case 38400:
  70                 return 0x02;
  71         case 57600:
  72                 return 0x03;
  73         case 115200:
  74                 return 0x04;
  75         case 230400:
  76                 return 0x05;
  77         case 460800:
  78                 return 0x06;
  79         case 921600:
  80                 return 0x07;
  81         case 1843200:
  82                 return 0x08;
  83         case 3250000:
  84                 return 0x09;
  85         case 2000000:
  86                 return 0x0a;
  87         case 3000000:
  88                 return 0x0b;
  89         default:
  90                 return 0xff;
  91         }
  92 }
  93
  94 static int intel_wait_booting(struct hci_uart *hu)
  95 {
  96         struct intel_data *intel = hu->priv;
  97         int err;
  98
  99         err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
 100                                   TASK_INTERRUPTIBLE,
 101                                   msecs_to_jiffies(1000));
 102
 103         if (err == 1) {
 104                 BT_ERR("%s: Device boot interrupted", hu->hdev->name);
 105                 return -EINTR;
 106         }
 107
 108         if (err) {
 109                 BT_ERR("%s: Device boot timeout", hu->hdev->name);
 110                 return -ETIMEDOUT;
 111         }
 112
 113         return err;
 114 }
 115
 116 static int intel_set_power(struct hci_uart *hu, bool powered)
 117 {
 118         struct list_head *p;
 119         int err = -ENODEV;
 120
 121         spin_lock(&intel_device_list_lock);
 122
 123         list_for_each(p, &intel_device_list) {
 124                 struct intel_device *idev = list_entry(p, struct intel_device,
 125                                                        list);
 126
 127                 /* tty device and pdev device should share the same parent
 128                  * which is the UART port.
 129                  */
 130                 if (hu->tty->dev->parent != idev->pdev->dev.parent)
 131                         continue;
 132
 133                 if (!idev->reset) {
 134                         err = -ENOTSUPP;
 135                         break;
 136                 }
 137
 138                 BT_INFO("hu %p, Switching compatible pm device (%s) to %u",
 139                         hu, dev_name(&idev->pdev->dev), powered);
 140
 141                 gpiod_set_value(idev->reset, powered);
 142         }
 143
 144         spin_unlock(&intel_device_list_lock);
 145
 146         return err;
 147 }
 148
 149 static int intel_open(struct hci_uart *hu)
 150 {
 151         struct intel_data *intel;
 152
 153         BT_DBG("hu %p", hu);
 154
 155         intel = kzalloc(sizeof(*intel), GFP_KERNEL);
 156         if (!intel)
 157                 return -ENOMEM;
 158
 159         skb_queue_head_init(&intel->txq);
 160
 161         hu->priv = intel;
 162
 163         if (!intel_set_power(hu, true))
 164                 set_bit(STATE_BOOTING, &intel->flags);
 165
 166         return 0;
 167 }
 168
 169 static int intel_close(struct hci_uart *hu)
 170 {
 171         struct intel_data *intel = hu->priv;
 172
 173         BT_DBG("hu %p", hu);
 174
 175         intel_set_power(hu, false);
 176
 177         skb_queue_purge(&intel->txq);
 178         kfree_skb(intel->rx_skb);
 179         kfree(intel);
 180
 181         hu->priv = NULL;
 182         return 0;
 183 }
 184
 185 static int intel_flush(struct hci_uart *hu)
 186 {
 187         struct intel_data *intel = hu->priv;
 188
 189         BT_DBG("hu %p", hu);
 190
 191         skb_queue_purge(&intel->txq);
 192
 193         return 0;
 194 }
 195
 196 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
 197 {
 198         struct sk_buff *skb;
 199         struct hci_event_hdr *hdr;
 200         struct hci_ev_cmd_complete *evt;
 201
 202         skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
 203         if (!skb)
 204                 return -ENOMEM;
 205
 206         hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
 207         hdr->evt = HCI_EV_CMD_COMPLETE;
 208         hdr->plen = sizeof(*evt) + 1;
 209
 210         evt = (struct hci_ev_cmd_complete *)skb_put(skb, sizeof(*evt));
 211         evt->ncmd = 0x01;
 212         evt->opcode = cpu_to_le16(opcode);
 213
 214         *skb_put(skb, 1) = 0x00;
 215
 216         bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
 217
 218         return hci_recv_frame(hdev, skb);
 219 }
 220
 221 static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed)
 222 {
 223         struct intel_data *intel = hu->priv;
 224         struct hci_dev *hdev = hu->hdev;
 225         u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 };
 226         struct sk_buff *skb;
 227         int err;
 228
 229         /* This can be the first command sent to the chip, check
 230          * that the controller is ready.
 231          */
 232         err = intel_wait_booting(hu);
 233
 234         clear_bit(STATE_BOOTING, &intel->flags);
 235
 236         /* In case of timeout, try to continue anyway */
 237         if (err && err != ETIMEDOUT)
 238                 return err;
 239
 240         BT_INFO("%s: Change controller speed to %d", hdev->name, speed);
 241
 242         speed_cmd[3] = intel_convert_speed(speed);
 243         if (speed_cmd[3] == 0xff) {
 244                 BT_ERR("%s: Unsupported speed", hdev->name);
 245                 return -EINVAL;
 246         }
 247
 248         /* Device will not accept speed change if Intel version has not been
 249          * previously requested.
 250          */
 251         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 252         if (IS_ERR(skb)) {
 253                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 254                        hdev->name, PTR_ERR(skb));
 255                 return PTR_ERR(skb);
 256         }
 257         kfree_skb(skb);
 258
 259         skb = bt_skb_alloc(sizeof(speed_cmd), GFP_KERNEL);
 260         if (!skb) {
 261                 BT_ERR("%s: Failed to allocate memory for baudrate packet",
 262                        hdev->name);
 263                 return -ENOMEM;
 264         }
 265
 266         memcpy(skb_put(skb, sizeof(speed_cmd)), speed_cmd, sizeof(speed_cmd));
 267         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 268
 269         hci_uart_set_flow_control(hu, true);
 270
 271         skb_queue_tail(&intel->txq, skb);
 272         hci_uart_tx_wakeup(hu);
 273
 274         /* wait 100ms to change baudrate on controller side */
 275         msleep(100);
 276
 277         hci_uart_set_baudrate(hu, speed);
 278         hci_uart_set_flow_control(hu, false);
 279
 280         return 0;
 281 }
 282
 283 static int intel_setup(struct hci_uart *hu)
 284 {
 285         static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
 286                                           0x00, 0x08, 0x04, 0x00 };
 287         struct intel_data *intel = hu->priv;
 288         struct hci_dev *hdev = hu->hdev;
 289         struct sk_buff *skb;
 290         struct intel_version *ver;
 291         struct intel_boot_params *params;
 292         const struct firmware *fw;
 293         const u8 *fw_ptr;
 294         char fwname[64];
 295         u32 frag_len;
 296         ktime_t calltime, delta, rettime;
 297         unsigned long long duration;
 298         unsigned int init_speed, oper_speed;
 299         int speed_change = 0;
 300         int err;
 301
 302         BT_DBG("%s", hdev->name);
 303
 304         hu->hdev->set_bdaddr = btintel_set_bdaddr;
 305
 306         calltime = ktime_get();
 307
 308         if (hu->init_speed)
 309                 init_speed = hu->init_speed;
 310         else
 311                 init_speed = hu->proto->init_speed;
 312
 313         if (hu->oper_speed)
 314                 oper_speed = hu->oper_speed;
 315         else
 316                 oper_speed = hu->proto->oper_speed;
 317
 318         if (oper_speed && init_speed && oper_speed != init_speed)
 319                 speed_change = 1;
 320
 321         /* Check that the controller is ready */
 322         err = intel_wait_booting(hu);
 323
 324         clear_bit(STATE_BOOTING, &intel->flags);
 325
 326         /* In case of timeout, try to continue anyway */
 327         if (err && err != ETIMEDOUT)
 328                 return err;
 329
 330         set_bit(STATE_BOOTLOADER, &intel->flags);
 331
 332         /* Read the Intel version information to determine if the device
 333          * is in bootloader mode or if it already has operational firmware
 334          * loaded.
 335          */
 336         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 337         if (IS_ERR(skb)) {
 338                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 339                        hdev->name, PTR_ERR(skb));
 340                 return PTR_ERR(skb);
 341         }
 342
 343         if (skb->len != sizeof(*ver)) {
 344                 BT_ERR("%s: Intel version event size mismatch", hdev->name);
 345                 kfree_skb(skb);
 346                 return -EILSEQ;
 347         }
 348
 349         ver = (struct intel_version *)skb->data;
 350         if (ver->status) {
 351                 BT_ERR("%s: Intel version command failure (%02x)",
 352                        hdev->name, ver->status);
 353                 err = -bt_to_errno(ver->status);
 354                 kfree_skb(skb);
 355                 return err;
 356         }
 357
 358         /* The hardware platform number has a fixed value of 0x37 and
 359          * for now only accept this single value.
 360          */
 361         if (ver->hw_platform != 0x37) {
 362                 BT_ERR("%s: Unsupported Intel hardware platform (%u)",
 363                        hdev->name, ver->hw_platform);
 364                 kfree_skb(skb);
 365                 return -EINVAL;
 366         }
 367
 368         /* At the moment only the hardware variant iBT 3.0 (LnP/SfP) is
 369          * supported by this firmware loading method. This check has been
 370          * put in place to ensure correct forward compatibility options
 371          * when newer hardware variants come along.
 372          */
 373         if (ver->hw_variant != 0x0b) {
 374                 BT_ERR("%s: Unsupported Intel hardware variant (%u)",
 375                        hdev->name, ver->hw_variant);
 376                 kfree_skb(skb);
 377                 return -EINVAL;
 378         }
 379
 380         btintel_version_info(hdev, ver);
 381
 382         /* The firmware variant determines if the device is in bootloader
 383          * mode or is running operational firmware. The value 0x06 identifies
 384          * the bootloader and the value 0x23 identifies the operational
 385          * firmware.
 386          *
 387          * When the operational firmware is already present, then only
 388          * the check for valid Bluetooth device address is needed. This
 389          * determines if the device will be added as configured or
 390          * unconfigured controller.
 391          *
 392          * It is not possible to use the Secure Boot Parameters in this
 393          * case since that command is only available in bootloader mode.
 394          */
 395         if (ver->fw_variant == 0x23) {
 396                 kfree_skb(skb);
 397                 clear_bit(STATE_BOOTLOADER, &intel->flags);
 398                 btintel_check_bdaddr(hdev);
 399                 return 0;
 400         }
 401
 402         /* If the device is not in bootloader mode, then the only possible
 403          * choice is to return an error and abort the device initialization.
 404          */
 405         if (ver->fw_variant != 0x06) {
 406                 BT_ERR("%s: Unsupported Intel firmware variant (%u)",
 407                        hdev->name, ver->fw_variant);
 408                 kfree_skb(skb);
 409                 return -ENODEV;
 410         }
 411
 412         kfree_skb(skb);
 413
 414         /* Read the secure boot parameters to identify the operating
 415          * details of the bootloader.
 416          */
 417         skb = __hci_cmd_sync(hdev, 0xfc0d, 0, NULL, HCI_INIT_TIMEOUT);
 418         if (IS_ERR(skb)) {
 419                 BT_ERR("%s: Reading Intel boot parameters failed (%ld)",
 420                        hdev->name, PTR_ERR(skb));
 421                 return PTR_ERR(skb);
 422         }
 423
 424         if (skb->len != sizeof(*params)) {
 425                 BT_ERR("%s: Intel boot parameters size mismatch", hdev->name);
 426                 kfree_skb(skb);
 427                 return -EILSEQ;
 428         }
 429
 430         params = (struct intel_boot_params *)skb->data;
 431         if (params->status) {
 432                 BT_ERR("%s: Intel boot parameters command failure (%02x)",
 433                        hdev->name, params->status);
 434                 err = -bt_to_errno(params->status);
 435                 kfree_skb(skb);
 436                 return err;
 437         }
 438
 439         BT_INFO("%s: Device revision is %u", hdev->name,
 440                 le16_to_cpu(params->dev_revid));
 441
 442         BT_INFO("%s: Secure boot is %s", hdev->name,
 443                 params->secure_boot ? "enabled" : "disabled");
 444
 445         BT_INFO("%s: Minimum firmware build %u week %u %u", hdev->name,
 446                 params->min_fw_build_nn, params->min_fw_build_cw,
 447                 2000 + params->min_fw_build_yy);
 448
 449         /* It is required that every single firmware fragment is acknowledged
 450          * with a command complete event. If the boot parameters indicate
 451          * that this bootloader does not send them, then abort the setup.
 452          */
 453         if (params->limited_cce != 0x00) {
 454                 BT_ERR("%s: Unsupported Intel firmware loading method (%u)",
 455                        hdev->name, params->limited_cce);
 456                 kfree_skb(skb);
 457                 return -EINVAL;
 458         }
 459
 460         /* If the OTP has no valid Bluetooth device address, then there will
 461          * also be no valid address for the operational firmware.
 462          */
 463         if (!bacmp(&params->otp_bdaddr, BDADDR_ANY)) {
 464                 BT_INFO("%s: No device address configured", hdev->name);
 465                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 466         }
 467
 468         /* With this Intel bootloader only the hardware variant and device
 469          * revision information are used to select the right firmware.
 470          *
 471          * Currently this bootloader support is limited to hardware variant
 472          * iBT 3.0 (LnP/SfP) which is identified by the value 11 (0x0b).
 473          */
 474         snprintf(fwname, sizeof(fwname), "intel/ibt-11-%u.sfi",
 475                  le16_to_cpu(params->dev_revid));
 476
 477         err = request_firmware(&fw, fwname, &hdev->dev);
 478         if (err < 0) {
 479                 BT_ERR("%s: Failed to load Intel firmware file (%d)",
 480                        hdev->name, err);
 481                 kfree_skb(skb);
 482                 return err;
 483         }
 484
 485         BT_INFO("%s: Found device firmware: %s", hdev->name, fwname);
 486
 487         kfree_skb(skb);
 488
 489         if (fw->size < 644) {
 490                 BT_ERR("%s: Invalid size of firmware file (%zu)",
 491                        hdev->name, fw->size);
 492                 err = -EBADF;
 493                 goto done;
 494         }
 495
 496         set_bit(STATE_DOWNLOADING, &intel->flags);
 497
 498         /* Start the firmware download transaction with the Init fragment
 499          * represented by the 128 bytes of CSS header.
 500          */
 501         err = btintel_secure_send(hdev, 0x00, 128, fw->data);
 502         if (err < 0) {
 503                 BT_ERR("%s: Failed to send firmware header (%d)",
 504                        hdev->name, err);
 505                 goto done;
 506         }
 507
 508         /* Send the 256 bytes of public key information from the firmware
 509          * as the PKey fragment.
 510          */
 511         err = btintel_secure_send(hdev, 0x03, 256, fw->data + 128);
 512         if (err < 0) {
 513                 BT_ERR("%s: Failed to send firmware public key (%d)",
 514                        hdev->name, err);
 515                 goto done;
 516         }
 517
 518         /* Send the 256 bytes of signature information from the firmware
 519          * as the Sign fragment.
 520          */
 521         err = btintel_secure_send(hdev, 0x02, 256, fw->data + 388);
 522         if (err < 0) {
 523                 BT_ERR("%s: Failed to send firmware signature (%d)",
 524                        hdev->name, err);
 525                 goto done;
 526         }
 527
 528         fw_ptr = fw->data + 644;
 529         frag_len = 0;
 530
 531         while (fw_ptr - fw->data < fw->size) {
 532                 struct hci_command_hdr *cmd = (void *)(fw_ptr + frag_len);
 533
 534                 frag_len += sizeof(*cmd) + cmd->plen;
 535
 536                 BT_DBG("%s: patching %td/%zu", hdev->name,
 537                        (fw_ptr - fw->data), fw->size);
 538
 539                 /* The parameter length of the secure send command requires
 540                  * a 4 byte alignment. It happens so that the firmware file
 541                  * contains proper Intel_NOP commands to align the fragments
 542                  * as needed.
 543                  *
 544                  * Send set of commands with 4 byte alignment from the
 545                  * firmware data buffer as a single Data fragement.
 546                  */
 547                 if (frag_len % 4)
 548                         continue;
 549
 550                 /* Send each command from the firmware data buffer as
 551                  * a single Data fragment.
 552                  */
 553                 err = btintel_secure_send(hdev, 0x01, frag_len, fw_ptr);
 554                 if (err < 0) {
 555                         BT_ERR("%s: Failed to send firmware data (%d)",
 556                                hdev->name, err);
 557                         goto done;
 558                 }
 559
 560                 fw_ptr += frag_len;
 561                 frag_len = 0;
 562         }
 563
 564         set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
 565
 566         BT_INFO("%s: Waiting for firmware download to complete", hdev->name);
 567
 568         /* Before switching the device into operational mode and with that
 569          * booting the loaded firmware, wait for the bootloader notification
 570          * that all fragments have been successfully received.
 571          *
 572          * When the event processing receives the notification, then the
 573          * STATE_DOWNLOADING flag will be cleared.
 574          *
 575          * The firmware loading should not take longer than 5 seconds
 576          * and thus just timeout if that happens and fail the setup
 577          * of this device.
 578          */
 579         err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
 580                                   TASK_INTERRUPTIBLE,
 581                                   msecs_to_jiffies(5000));
 582         if (err == 1) {
 583                 BT_ERR("%s: Firmware loading interrupted", hdev->name);
 584                 err = -EINTR;
 585                 goto done;
 586         }
 587
 588         if (err) {
 589                 BT_ERR("%s: Firmware loading timeout", hdev->name);
 590                 err = -ETIMEDOUT;
 591                 goto done;
 592         }
 593
 594         if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
 595                 BT_ERR("%s: Firmware loading failed", hdev->name);
 596                 err = -ENOEXEC;
 597                 goto done;
 598         }
 599
 600         rettime = ktime_get();
 601         delta = ktime_sub(rettime, calltime);
 602         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 603
 604         BT_INFO("%s: Firmware loaded in %llu usecs", hdev->name, duration);
 605
 606 done:
 607         release_firmware(fw);
 608
 609         if (err < 0)
 610                 return err;
 611
 612         /* We need to restore the default speed before Intel reset */
 613         if (speed_change) {
 614                 err = intel_set_baudrate(hu, init_speed);
 615                 if (err)
 616                         return err;
 617         }
 618
 619         calltime = ktime_get();
 620
 621         set_bit(STATE_BOOTING, &intel->flags);
 622
 623         skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(reset_param), reset_param,
 624                              HCI_INIT_TIMEOUT);
 625         if (IS_ERR(skb))
 626                 return PTR_ERR(skb);
 627
 628         kfree_skb(skb);
 629
 630         /* The bootloader will not indicate when the device is ready. This
 631          * is done by the operational firmware sending bootup notification.
 632          *
 633          * Booting into operational firmware should not take longer than
 634          * 1 second. However if that happens, then just fail the setup
 635          * since something went wrong.
 636          */
 637         BT_INFO("%s: Waiting for device to boot", hdev->name);
 638
 639         err = intel_wait_booting(hu);
 640         if (err)
 641                 return err;
 642
 643         clear_bit(STATE_BOOTING, &intel->flags);
 644
 645         rettime = ktime_get();
 646         delta = ktime_sub(rettime, calltime);
 647         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 648
 649         BT_INFO("%s: Device booted in %llu usecs", hdev->name, duration);
 650
 651         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
 652         if (IS_ERR(skb))
 653                 return PTR_ERR(skb);
 654         kfree_skb(skb);
 655
 656         if (speed_change) {
 657                 err = intel_set_baudrate(hu, oper_speed);
 658                 if (err)
 659                         return err;
 660         }
 661
 662         BT_INFO("%s: Setup complete", hdev->name);
 663
 664         clear_bit(STATE_BOOTLOADER, &intel->flags);
 665
 666         return 0;
 667 }
 668
 669 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 670 {
 671         struct hci_uart *hu = hci_get_drvdata(hdev);
 672         struct intel_data *intel = hu->priv;
 673         struct hci_event_hdr *hdr;
 674
 675         if (!test_bit(STATE_BOOTLOADER, &intel->flags) &&
 676             !test_bit(STATE_BOOTING, &intel->flags))
 677                 goto recv;
 678
 679         hdr = (void *)skb->data;
 680
 681         /* When the firmware loading completes the device sends
 682          * out a vendor specific event indicating the result of
 683          * the firmware loading.
 684          */
 685         if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
 686             skb->data[2] == 0x06) {
 687                 if (skb->data[3] != 0x00)
 688                         set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
 689
 690                 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
 691                     test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
 692                         smp_mb__after_atomic();
 693                         wake_up_bit(&intel->flags, STATE_DOWNLOADING);
 694                 }
 695
 696         /* When switching to the operational firmware the device
 697          * sends a vendor specific event indicating that the bootup
 698          * completed.
 699          */
 700         } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
 701                    skb->data[2] == 0x02) {
 702                 if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
 703                         smp_mb__after_atomic();
 704                         wake_up_bit(&intel->flags, STATE_BOOTING);
 705                 }
 706         }
 707 recv:
 708         return hci_recv_frame(hdev, skb);
 709 }
 710
 711 static const struct h4_recv_pkt intel_recv_pkts[] = {
 712         { H4_RECV_ACL,   .recv = hci_recv_frame },
 713         { H4_RECV_SCO,   .recv = hci_recv_frame },
 714         { H4_RECV_EVENT, .recv = intel_recv_event },
 715 };
 716
 717 static int intel_recv(struct hci_uart *hu, const void *data, int count)
 718 {
 719         struct intel_data *intel = hu->priv;
 720
 721         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 722                 return -EUNATCH;
 723
 724         intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
 725                                     intel_recv_pkts,
 726                                     ARRAY_SIZE(intel_recv_pkts));
 727         if (IS_ERR(intel->rx_skb)) {
 728                 int err = PTR_ERR(intel->rx_skb);
 729                 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 730                 intel->rx_skb = NULL;
 731                 return err;
 732         }
 733
 734         return count;
 735 }
 736
 737 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 738 {
 739         struct intel_data *intel = hu->priv;
 740
 741         BT_DBG("hu %p skb %p", hu, skb);
 742
 743         skb_queue_tail(&intel->txq, skb);
 744
 745         return 0;
 746 }
 747
 748 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
 749 {
 750         struct intel_data *intel = hu->priv;
 751         struct sk_buff *skb;
 752
 753         skb = skb_dequeue(&intel->txq);
 754         if (!skb)
 755                 return skb;
 756
 757         if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
 758             (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)) {
 759                 struct hci_command_hdr *cmd = (void *)skb->data;
 760                 __u16 opcode = le16_to_cpu(cmd->opcode);
 761
 762                 /* When the 0xfc01 command is issued to boot into
 763                  * the operational firmware, it will actually not
 764                  * send a command complete event. To keep the flow
 765                  * control working inject that event here.
 766                  */
 767                 if (opcode == 0xfc01)
 768                         inject_cmd_complete(hu->hdev, opcode);
 769         }
 770
 771         /* Prepend skb with frame type */
 772         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 773
 774         return skb;
 775 }
 776
 777 static const struct hci_uart_proto intel_proto = {
 778         .id             = HCI_UART_INTEL,
 779         .name           = "Intel",
 780         .init_speed     = 115200,
 781         .oper_speed     = 3000000,
 782         .open           = intel_open,
 783         .close          = intel_close,
 784         .flush          = intel_flush,
 785         .setup          = intel_setup,
 786         .set_baudrate   = intel_set_baudrate,
 787         .recv           = intel_recv,
 788         .enqueue        = intel_enqueue,
 789         .dequeue        = intel_dequeue,
 790 };
 791
 792 #ifdef CONFIG_ACPI
 793 static const struct acpi_device_id intel_acpi_match[] = {
 794         { "INT33E1", 0 },
 795         { },
 796 };
 797 MODULE_DEVICE_TABLE(acpi, intel_acpi_match);
 798
 799 static int intel_acpi_probe(struct intel_device *idev)
 800 {
 801         const struct acpi_device_id *id;
 802
 803         id = acpi_match_device(intel_acpi_match, &idev->pdev->dev);
 804         if (!id)
 805                 return -ENODEV;
 806
 807         return 0;
 808 }
 809 #else
 810 static int intel_acpi_probe(struct intel_device *idev)
 811 {
 812         return -ENODEV;
 813 }
 814 #endif
 815
 816 static int intel_probe(struct platform_device *pdev)
 817 {
 818         struct intel_device *idev;
 819
 820         idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
 821         if (!idev)
 822                 return -ENOMEM;
 823
 824         idev->pdev = pdev;
 825
 826         if (ACPI_HANDLE(&pdev->dev)) {
 827                 int err = intel_acpi_probe(idev);
 828                 if (err)
 829                         return err;
 830         } else {
 831                 return -ENODEV;
 832         }
 833
 834         idev->reset = devm_gpiod_get_optional(&pdev->dev, "reset",
 835                                               GPIOD_OUT_LOW);
 836         if (IS_ERR(idev->reset)) {
 837                 dev_err(&pdev->dev, "Unable to retrieve gpio\n");
 838                 return PTR_ERR(idev->reset);
 839         }
 840
 841         platform_set_drvdata(pdev, idev);
 842
 843         /* Place this instance on the device list */
 844         spin_lock(&intel_device_list_lock);
 845         list_add_tail(&idev->list, &intel_device_list);
 846         spin_unlock(&intel_device_list_lock);
 847
 848         dev_info(&pdev->dev, "registered.\n");
 849
 850         return 0;
 851 }
 852
 853 static int intel_remove(struct platform_device *pdev)
 854 {
 855         struct intel_device *idev = platform_get_drvdata(pdev);
 856
 857         spin_lock(&intel_device_list_lock);
 858         list_del(&idev->list);
 859         spin_unlock(&intel_device_list_lock);
 860
 861         dev_info(&pdev->dev, "unregistered.\n");
 862
 863         return 0;
 864 }
 865
 866 static struct platform_driver intel_driver = {
 867         .probe = intel_probe,
 868         .remove = intel_remove,
 869         .driver = {
 870                 .name = "hci_intel",
 871                 .acpi_match_table = ACPI_PTR(intel_acpi_match),
 872         },
 873 };
 874
 875 int __init intel_init(void)
 876 {
 877         platform_driver_register(&intel_driver);
 878
 879         return hci_uart_register_proto(&intel_proto);
 880 }
 881
 882 int __exit intel_deinit(void)
 883 {
 884         platform_driver_unregister(&intel_driver);
 885
 886         return hci_uart_unregister_proto(&intel_proto);
 887 }