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 #include <linux/interrupt.h>
  35
  36 #include <net/bluetooth/bluetooth.h>
  37 #include <net/bluetooth/hci_core.h>
  38
  39 #include "hci_uart.h"
  40 #include "btintel.h"
  41
  42 #define STATE_BOOTLOADER        0
  43 #define STATE_DOWNLOADING       1
  44 #define STATE_FIRMWARE_LOADED   2
  45 #define STATE_FIRMWARE_FAILED   3
  46 #define STATE_BOOTING           4
  47
  48 struct intel_device {
  49         struct list_head list;
  50         struct platform_device *pdev;
  51         struct gpio_desc *reset;
  52         int irq;
  53 };
  54
  55 static LIST_HEAD(intel_device_list);
  56 static DEFINE_SPINLOCK(intel_device_list_lock);
  57
  58 struct intel_data {
  59         struct sk_buff *rx_skb;
  60         struct sk_buff_head txq;
  61         unsigned long flags;
  62 };
  63
  64 static u8 intel_convert_speed(unsigned int speed)
  65 {
  66         switch (speed) {
  67         case 9600:
  68                 return 0x00;
  69         case 19200:
  70                 return 0x01;
  71         case 38400:
  72                 return 0x02;
  73         case 57600:
  74                 return 0x03;
  75         case 115200:
  76                 return 0x04;
  77         case 230400:
  78                 return 0x05;
  79         case 460800:
  80                 return 0x06;
  81         case 921600:
  82                 return 0x07;
  83         case 1843200:
  84                 return 0x08;
  85         case 3250000:
  86                 return 0x09;
  87         case 2000000:
  88                 return 0x0a;
  89         case 3000000:
  90                 return 0x0b;
  91         default:
  92                 return 0xff;
  93         }
  94 }
  95
  96 static int intel_wait_booting(struct hci_uart *hu)
  97 {
  98         struct intel_data *intel = hu->priv;
  99         int err;
 100
 101         err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
 102                                   TASK_INTERRUPTIBLE,
 103                                   msecs_to_jiffies(1000));
 104
 105         if (err == 1) {
 106                 BT_ERR("%s: Device boot interrupted", hu->hdev->name);
 107                 return -EINTR;
 108         }
 109
 110         if (err) {
 111                 BT_ERR("%s: Device boot timeout", hu->hdev->name);
 112                 return -ETIMEDOUT;
 113         }
 114
 115         return err;
 116 }
 117
 118 static irqreturn_t intel_irq(int irq, void *dev_id)
 119 {
 120         struct intel_device *idev = dev_id;
 121
 122         dev_info(&idev->pdev->dev, "hci_intel irq\n");
 123
 124         return IRQ_HANDLED;
 125 }
 126
 127 static int intel_set_power(struct hci_uart *hu, bool powered)
 128 {
 129         struct list_head *p;
 130         int err = -ENODEV;
 131
 132         spin_lock(&intel_device_list_lock);
 133
 134         list_for_each(p, &intel_device_list) {
 135                 struct intel_device *idev = list_entry(p, struct intel_device,
 136                                                        list);
 137
 138                 /* tty device and pdev device should share the same parent
 139                  * which is the UART port.
 140                  */
 141                 if (hu->tty->dev->parent != idev->pdev->dev.parent)
 142                         continue;
 143
 144                 if (!idev->reset) {
 145                         err = -ENOTSUPP;
 146                         break;
 147                 }
 148
 149                 BT_INFO("hu %p, Switching compatible pm device (%s) to %u",
 150                         hu, dev_name(&idev->pdev->dev), powered);
 151
 152                 gpiod_set_value(idev->reset, powered);
 153
 154                 if (idev->irq < 0)
 155                         break;
 156
 157                 if (powered && device_can_wakeup(&idev->pdev->dev)) {
 158                         err = devm_request_threaded_irq(&idev->pdev->dev,
 159                                                         idev->irq, NULL,
 160                                                         intel_irq,
 161                                                         IRQF_ONESHOT,
 162                                                         "bt-host-wake", idev);
 163                         if (err) {
 164                                 BT_ERR("hu %p, unable to allocate irq-%d",
 165                                        hu, idev->irq);
 166                                 break;
 167                         }
 168
 169                         device_wakeup_enable(&idev->pdev->dev);
 170                 } else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
 171                         devm_free_irq(&idev->pdev->dev, idev->irq, idev);
 172                         device_wakeup_disable(&idev->pdev->dev);
 173                 }
 174         }
 175
 176         spin_unlock(&intel_device_list_lock);
 177
 178         return err;
 179 }
 180
 181 static int intel_open(struct hci_uart *hu)
 182 {
 183         struct intel_data *intel;
 184
 185         BT_DBG("hu %p", hu);
 186
 187         intel = kzalloc(sizeof(*intel), GFP_KERNEL);
 188         if (!intel)
 189                 return -ENOMEM;
 190
 191         skb_queue_head_init(&intel->txq);
 192
 193         hu->priv = intel;
 194
 195         if (!intel_set_power(hu, true))
 196                 set_bit(STATE_BOOTING, &intel->flags);
 197
 198         return 0;
 199 }
 200
 201 static int intel_close(struct hci_uart *hu)
 202 {
 203         struct intel_data *intel = hu->priv;
 204
 205         BT_DBG("hu %p", hu);
 206
 207         intel_set_power(hu, false);
 208
 209         skb_queue_purge(&intel->txq);
 210         kfree_skb(intel->rx_skb);
 211         kfree(intel);
 212
 213         hu->priv = NULL;
 214         return 0;
 215 }
 216
 217 static int intel_flush(struct hci_uart *hu)
 218 {
 219         struct intel_data *intel = hu->priv;
 220
 221         BT_DBG("hu %p", hu);
 222
 223         skb_queue_purge(&intel->txq);
 224
 225         return 0;
 226 }
 227
 228 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
 229 {
 230         struct sk_buff *skb;
 231         struct hci_event_hdr *hdr;
 232         struct hci_ev_cmd_complete *evt;
 233
 234         skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
 235         if (!skb)
 236                 return -ENOMEM;
 237
 238         hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
 239         hdr->evt = HCI_EV_CMD_COMPLETE;
 240         hdr->plen = sizeof(*evt) + 1;
 241
 242         evt = (struct hci_ev_cmd_complete *)skb_put(skb, sizeof(*evt));
 243         evt->ncmd = 0x01;
 244         evt->opcode = cpu_to_le16(opcode);
 245
 246         *skb_put(skb, 1) = 0x00;
 247
 248         bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
 249
 250         return hci_recv_frame(hdev, skb);
 251 }
 252
 253 static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed)
 254 {
 255         struct intel_data *intel = hu->priv;
 256         struct hci_dev *hdev = hu->hdev;
 257         u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 };
 258         struct sk_buff *skb;
 259         int err;
 260
 261         /* This can be the first command sent to the chip, check
 262          * that the controller is ready.
 263          */
 264         err = intel_wait_booting(hu);
 265
 266         clear_bit(STATE_BOOTING, &intel->flags);
 267
 268         /* In case of timeout, try to continue anyway */
 269         if (err && err != ETIMEDOUT)
 270                 return err;
 271
 272         BT_INFO("%s: Change controller speed to %d", hdev->name, speed);
 273
 274         speed_cmd[3] = intel_convert_speed(speed);
 275         if (speed_cmd[3] == 0xff) {
 276                 BT_ERR("%s: Unsupported speed", hdev->name);
 277                 return -EINVAL;
 278         }
 279
 280         /* Device will not accept speed change if Intel version has not been
 281          * previously requested.
 282          */
 283         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 284         if (IS_ERR(skb)) {
 285                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 286                        hdev->name, PTR_ERR(skb));
 287                 return PTR_ERR(skb);
 288         }
 289         kfree_skb(skb);
 290
 291         skb = bt_skb_alloc(sizeof(speed_cmd), GFP_KERNEL);
 292         if (!skb) {
 293                 BT_ERR("%s: Failed to allocate memory for baudrate packet",
 294                        hdev->name);
 295                 return -ENOMEM;
 296         }
 297
 298         memcpy(skb_put(skb, sizeof(speed_cmd)), speed_cmd, sizeof(speed_cmd));
 299         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 300
 301         hci_uart_set_flow_control(hu, true);
 302
 303         skb_queue_tail(&intel->txq, skb);
 304         hci_uart_tx_wakeup(hu);
 305
 306         /* wait 100ms to change baudrate on controller side */
 307         msleep(100);
 308
 309         hci_uart_set_baudrate(hu, speed);
 310         hci_uart_set_flow_control(hu, false);
 311
 312         return 0;
 313 }
 314
 315 static int intel_setup(struct hci_uart *hu)
 316 {
 317         static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
 318                                           0x00, 0x08, 0x04, 0x00 };
 319         struct intel_data *intel = hu->priv;
 320         struct hci_dev *hdev = hu->hdev;
 321         struct sk_buff *skb;
 322         struct intel_version *ver;
 323         struct intel_boot_params *params;
 324         const struct firmware *fw;
 325         const u8 *fw_ptr;
 326         char fwname[64];
 327         u32 frag_len;
 328         ktime_t calltime, delta, rettime;
 329         unsigned long long duration;
 330         unsigned int init_speed, oper_speed;
 331         int speed_change = 0;
 332         int err;
 333
 334         BT_DBG("%s", hdev->name);
 335
 336         hu->hdev->set_bdaddr = btintel_set_bdaddr;
 337
 338         calltime = ktime_get();
 339
 340         if (hu->init_speed)
 341                 init_speed = hu->init_speed;
 342         else
 343                 init_speed = hu->proto->init_speed;
 344
 345         if (hu->oper_speed)
 346                 oper_speed = hu->oper_speed;
 347         else
 348                 oper_speed = hu->proto->oper_speed;
 349
 350         if (oper_speed && init_speed && oper_speed != init_speed)
 351                 speed_change = 1;
 352
 353         /* Check that the controller is ready */
 354         err = intel_wait_booting(hu);
 355
 356         clear_bit(STATE_BOOTING, &intel->flags);
 357
 358         /* In case of timeout, try to continue anyway */
 359         if (err && err != ETIMEDOUT)
 360                 return err;
 361
 362         set_bit(STATE_BOOTLOADER, &intel->flags);
 363
 364         /* Read the Intel version information to determine if the device
 365          * is in bootloader mode or if it already has operational firmware
 366          * loaded.
 367          */
 368         skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_INIT_TIMEOUT);
 369         if (IS_ERR(skb)) {
 370                 BT_ERR("%s: Reading Intel version information failed (%ld)",
 371                        hdev->name, PTR_ERR(skb));
 372                 return PTR_ERR(skb);
 373         }
 374
 375         if (skb->len != sizeof(*ver)) {
 376                 BT_ERR("%s: Intel version event size mismatch", hdev->name);
 377                 kfree_skb(skb);
 378                 return -EILSEQ;
 379         }
 380
 381         ver = (struct intel_version *)skb->data;
 382         if (ver->status) {
 383                 BT_ERR("%s: Intel version command failure (%02x)",
 384                        hdev->name, ver->status);
 385                 err = -bt_to_errno(ver->status);
 386                 kfree_skb(skb);
 387                 return err;
 388         }
 389
 390         /* The hardware platform number has a fixed value of 0x37 and
 391          * for now only accept this single value.
 392          */
 393         if (ver->hw_platform != 0x37) {
 394                 BT_ERR("%s: Unsupported Intel hardware platform (%u)",
 395                        hdev->name, ver->hw_platform);
 396                 kfree_skb(skb);
 397                 return -EINVAL;
 398         }
 399
 400         /* At the moment only the hardware variant iBT 3.0 (LnP/SfP) is
 401          * supported by this firmware loading method. This check has been
 402          * put in place to ensure correct forward compatibility options
 403          * when newer hardware variants come along.
 404          */
 405         if (ver->hw_variant != 0x0b) {
 406                 BT_ERR("%s: Unsupported Intel hardware variant (%u)",
 407                        hdev->name, ver->hw_variant);
 408                 kfree_skb(skb);
 409                 return -EINVAL;
 410         }
 411
 412         btintel_version_info(hdev, ver);
 413
 414         /* The firmware variant determines if the device is in bootloader
 415          * mode or is running operational firmware. The value 0x06 identifies
 416          * the bootloader and the value 0x23 identifies the operational
 417          * firmware.
 418          *
 419          * When the operational firmware is already present, then only
 420          * the check for valid Bluetooth device address is needed. This
 421          * determines if the device will be added as configured or
 422          * unconfigured controller.
 423          *
 424          * It is not possible to use the Secure Boot Parameters in this
 425          * case since that command is only available in bootloader mode.
 426          */
 427         if (ver->fw_variant == 0x23) {
 428                 kfree_skb(skb);
 429                 clear_bit(STATE_BOOTLOADER, &intel->flags);
 430                 btintel_check_bdaddr(hdev);
 431                 return 0;
 432         }
 433
 434         /* If the device is not in bootloader mode, then the only possible
 435          * choice is to return an error and abort the device initialization.
 436          */
 437         if (ver->fw_variant != 0x06) {
 438                 BT_ERR("%s: Unsupported Intel firmware variant (%u)",
 439                        hdev->name, ver->fw_variant);
 440                 kfree_skb(skb);
 441                 return -ENODEV;
 442         }
 443
 444         kfree_skb(skb);
 445
 446         /* Read the secure boot parameters to identify the operating
 447          * details of the bootloader.
 448          */
 449         skb = __hci_cmd_sync(hdev, 0xfc0d, 0, NULL, HCI_INIT_TIMEOUT);
 450         if (IS_ERR(skb)) {
 451                 BT_ERR("%s: Reading Intel boot parameters failed (%ld)",
 452                        hdev->name, PTR_ERR(skb));
 453                 return PTR_ERR(skb);
 454         }
 455
 456         if (skb->len != sizeof(*params)) {
 457                 BT_ERR("%s: Intel boot parameters size mismatch", hdev->name);
 458                 kfree_skb(skb);
 459                 return -EILSEQ;
 460         }
 461
 462         params = (struct intel_boot_params *)skb->data;
 463         if (params->status) {
 464                 BT_ERR("%s: Intel boot parameters command failure (%02x)",
 465                        hdev->name, params->status);
 466                 err = -bt_to_errno(params->status);
 467                 kfree_skb(skb);
 468                 return err;
 469         }
 470
 471         BT_INFO("%s: Device revision is %u", hdev->name,
 472                 le16_to_cpu(params->dev_revid));
 473
 474         BT_INFO("%s: Secure boot is %s", hdev->name,
 475                 params->secure_boot ? "enabled" : "disabled");
 476
 477         BT_INFO("%s: Minimum firmware build %u week %u %u", hdev->name,
 478                 params->min_fw_build_nn, params->min_fw_build_cw,
 479                 2000 + params->min_fw_build_yy);
 480
 481         /* It is required that every single firmware fragment is acknowledged
 482          * with a command complete event. If the boot parameters indicate
 483          * that this bootloader does not send them, then abort the setup.
 484          */
 485         if (params->limited_cce != 0x00) {
 486                 BT_ERR("%s: Unsupported Intel firmware loading method (%u)",
 487                        hdev->name, params->limited_cce);
 488                 kfree_skb(skb);
 489                 return -EINVAL;
 490         }
 491
 492         /* If the OTP has no valid Bluetooth device address, then there will
 493          * also be no valid address for the operational firmware.
 494          */
 495         if (!bacmp(&params->otp_bdaddr, BDADDR_ANY)) {
 496                 BT_INFO("%s: No device address configured", hdev->name);
 497                 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
 498         }
 499
 500         /* With this Intel bootloader only the hardware variant and device
 501          * revision information are used to select the right firmware.
 502          *
 503          * Currently this bootloader support is limited to hardware variant
 504          * iBT 3.0 (LnP/SfP) which is identified by the value 11 (0x0b).
 505          */
 506         snprintf(fwname, sizeof(fwname), "intel/ibt-11-%u.sfi",
 507                  le16_to_cpu(params->dev_revid));
 508
 509         err = request_firmware(&fw, fwname, &hdev->dev);
 510         if (err < 0) {
 511                 BT_ERR("%s: Failed to load Intel firmware file (%d)",
 512                        hdev->name, err);
 513                 kfree_skb(skb);
 514                 return err;
 515         }
 516
 517         BT_INFO("%s: Found device firmware: %s", hdev->name, fwname);
 518
 519         kfree_skb(skb);
 520
 521         if (fw->size < 644) {
 522                 BT_ERR("%s: Invalid size of firmware file (%zu)",
 523                        hdev->name, fw->size);
 524                 err = -EBADF;
 525                 goto done;
 526         }
 527
 528         set_bit(STATE_DOWNLOADING, &intel->flags);
 529
 530         /* Start the firmware download transaction with the Init fragment
 531          * represented by the 128 bytes of CSS header.
 532          */
 533         err = btintel_secure_send(hdev, 0x00, 128, fw->data);
 534         if (err < 0) {
 535                 BT_ERR("%s: Failed to send firmware header (%d)",
 536                        hdev->name, err);
 537                 goto done;
 538         }
 539
 540         /* Send the 256 bytes of public key information from the firmware
 541          * as the PKey fragment.
 542          */
 543         err = btintel_secure_send(hdev, 0x03, 256, fw->data + 128);
 544         if (err < 0) {
 545                 BT_ERR("%s: Failed to send firmware public key (%d)",
 546                        hdev->name, err);
 547                 goto done;
 548         }
 549
 550         /* Send the 256 bytes of signature information from the firmware
 551          * as the Sign fragment.
 552          */
 553         err = btintel_secure_send(hdev, 0x02, 256, fw->data + 388);
 554         if (err < 0) {
 555                 BT_ERR("%s: Failed to send firmware signature (%d)",
 556                        hdev->name, err);
 557                 goto done;
 558         }
 559
 560         fw_ptr = fw->data + 644;
 561         frag_len = 0;
 562
 563         while (fw_ptr - fw->data < fw->size) {
 564                 struct hci_command_hdr *cmd = (void *)(fw_ptr + frag_len);
 565
 566                 frag_len += sizeof(*cmd) + cmd->plen;
 567
 568                 BT_DBG("%s: patching %td/%zu", hdev->name,
 569                        (fw_ptr - fw->data), fw->size);
 570
 571                 /* The parameter length of the secure send command requires
 572                  * a 4 byte alignment. It happens so that the firmware file
 573                  * contains proper Intel_NOP commands to align the fragments
 574                  * as needed.
 575                  *
 576                  * Send set of commands with 4 byte alignment from the
 577                  * firmware data buffer as a single Data fragement.
 578                  */
 579                 if (frag_len % 4)
 580                         continue;
 581
 582                 /* Send each command from the firmware data buffer as
 583                  * a single Data fragment.
 584                  */
 585                 err = btintel_secure_send(hdev, 0x01, frag_len, fw_ptr);
 586                 if (err < 0) {
 587                         BT_ERR("%s: Failed to send firmware data (%d)",
 588                                hdev->name, err);
 589                         goto done;
 590                 }
 591
 592                 fw_ptr += frag_len;
 593                 frag_len = 0;
 594         }
 595
 596         set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
 597
 598         BT_INFO("%s: Waiting for firmware download to complete", hdev->name);
 599
 600         /* Before switching the device into operational mode and with that
 601          * booting the loaded firmware, wait for the bootloader notification
 602          * that all fragments have been successfully received.
 603          *
 604          * When the event processing receives the notification, then the
 605          * STATE_DOWNLOADING flag will be cleared.
 606          *
 607          * The firmware loading should not take longer than 5 seconds
 608          * and thus just timeout if that happens and fail the setup
 609          * of this device.
 610          */
 611         err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
 612                                   TASK_INTERRUPTIBLE,
 613                                   msecs_to_jiffies(5000));
 614         if (err == 1) {
 615                 BT_ERR("%s: Firmware loading interrupted", hdev->name);
 616                 err = -EINTR;
 617                 goto done;
 618         }
 619
 620         if (err) {
 621                 BT_ERR("%s: Firmware loading timeout", hdev->name);
 622                 err = -ETIMEDOUT;
 623                 goto done;
 624         }
 625
 626         if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
 627                 BT_ERR("%s: Firmware loading failed", hdev->name);
 628                 err = -ENOEXEC;
 629                 goto done;
 630         }
 631
 632         rettime = ktime_get();
 633         delta = ktime_sub(rettime, calltime);
 634         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 635
 636         BT_INFO("%s: Firmware loaded in %llu usecs", hdev->name, duration);
 637
 638 done:
 639         release_firmware(fw);
 640
 641         if (err < 0)
 642                 return err;
 643
 644         /* We need to restore the default speed before Intel reset */
 645         if (speed_change) {
 646                 err = intel_set_baudrate(hu, init_speed);
 647                 if (err)
 648                         return err;
 649         }
 650
 651         calltime = ktime_get();
 652
 653         set_bit(STATE_BOOTING, &intel->flags);
 654
 655         skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(reset_param), reset_param,
 656                              HCI_INIT_TIMEOUT);
 657         if (IS_ERR(skb))
 658                 return PTR_ERR(skb);
 659
 660         kfree_skb(skb);
 661
 662         /* The bootloader will not indicate when the device is ready. This
 663          * is done by the operational firmware sending bootup notification.
 664          *
 665          * Booting into operational firmware should not take longer than
 666          * 1 second. However if that happens, then just fail the setup
 667          * since something went wrong.
 668          */
 669         BT_INFO("%s: Waiting for device to boot", hdev->name);
 670
 671         err = intel_wait_booting(hu);
 672         if (err)
 673                 return err;
 674
 675         clear_bit(STATE_BOOTING, &intel->flags);
 676
 677         rettime = ktime_get();
 678         delta = ktime_sub(rettime, calltime);
 679         duration = (unsigned long long) ktime_to_ns(delta) >> 10;
 680
 681         BT_INFO("%s: Device booted in %llu usecs", hdev->name, duration);
 682
 683         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
 684         if (IS_ERR(skb))
 685                 return PTR_ERR(skb);
 686         kfree_skb(skb);
 687
 688         if (speed_change) {
 689                 err = intel_set_baudrate(hu, oper_speed);
 690                 if (err)
 691                         return err;
 692         }
 693
 694         BT_INFO("%s: Setup complete", hdev->name);
 695
 696         clear_bit(STATE_BOOTLOADER, &intel->flags);
 697
 698         return 0;
 699 }
 700
 701 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 702 {
 703         struct hci_uart *hu = hci_get_drvdata(hdev);
 704         struct intel_data *intel = hu->priv;
 705         struct hci_event_hdr *hdr;
 706
 707         if (!test_bit(STATE_BOOTLOADER, &intel->flags) &&
 708             !test_bit(STATE_BOOTING, &intel->flags))
 709                 goto recv;
 710
 711         hdr = (void *)skb->data;
 712
 713         /* When the firmware loading completes the device sends
 714          * out a vendor specific event indicating the result of
 715          * the firmware loading.
 716          */
 717         if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
 718             skb->data[2] == 0x06) {
 719                 if (skb->data[3] != 0x00)
 720                         set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
 721
 722                 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
 723                     test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
 724                         smp_mb__after_atomic();
 725                         wake_up_bit(&intel->flags, STATE_DOWNLOADING);
 726                 }
 727
 728         /* When switching to the operational firmware the device
 729          * sends a vendor specific event indicating that the bootup
 730          * completed.
 731          */
 732         } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
 733                    skb->data[2] == 0x02) {
 734                 if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
 735                         smp_mb__after_atomic();
 736                         wake_up_bit(&intel->flags, STATE_BOOTING);
 737                 }
 738         }
 739 recv:
 740         return hci_recv_frame(hdev, skb);
 741 }
 742
 743 static const struct h4_recv_pkt intel_recv_pkts[] = {
 744         { H4_RECV_ACL,   .recv = hci_recv_frame },
 745         { H4_RECV_SCO,   .recv = hci_recv_frame },
 746         { H4_RECV_EVENT, .recv = intel_recv_event },
 747 };
 748
 749 static int intel_recv(struct hci_uart *hu, const void *data, int count)
 750 {
 751         struct intel_data *intel = hu->priv;
 752
 753         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 754                 return -EUNATCH;
 755
 756         intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
 757                                     intel_recv_pkts,
 758                                     ARRAY_SIZE(intel_recv_pkts));
 759         if (IS_ERR(intel->rx_skb)) {
 760                 int err = PTR_ERR(intel->rx_skb);
 761                 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 762                 intel->rx_skb = NULL;
 763                 return err;
 764         }
 765
 766         return count;
 767 }
 768
 769 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 770 {
 771         struct intel_data *intel = hu->priv;
 772
 773         BT_DBG("hu %p skb %p", hu, skb);
 774
 775         skb_queue_tail(&intel->txq, skb);
 776
 777         return 0;
 778 }
 779
 780 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
 781 {
 782         struct intel_data *intel = hu->priv;
 783         struct sk_buff *skb;
 784
 785         skb = skb_dequeue(&intel->txq);
 786         if (!skb)
 787                 return skb;
 788
 789         if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
 790             (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT)) {
 791                 struct hci_command_hdr *cmd = (void *)skb->data;
 792                 __u16 opcode = le16_to_cpu(cmd->opcode);
 793
 794                 /* When the 0xfc01 command is issued to boot into
 795                  * the operational firmware, it will actually not
 796                  * send a command complete event. To keep the flow
 797                  * control working inject that event here.
 798                  */
 799                 if (opcode == 0xfc01)
 800                         inject_cmd_complete(hu->hdev, opcode);
 801         }
 802
 803         /* Prepend skb with frame type */
 804         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 805
 806         return skb;
 807 }
 808
 809 static const struct hci_uart_proto intel_proto = {
 810         .id             = HCI_UART_INTEL,
 811         .name           = "Intel",
 812         .init_speed     = 115200,
 813         .oper_speed     = 3000000,
 814         .open           = intel_open,
 815         .close          = intel_close,
 816         .flush          = intel_flush,
 817         .setup          = intel_setup,
 818         .set_baudrate   = intel_set_baudrate,
 819         .recv           = intel_recv,
 820         .enqueue        = intel_enqueue,
 821         .dequeue        = intel_dequeue,
 822 };
 823
 824 #ifdef CONFIG_ACPI
 825 static const struct acpi_device_id intel_acpi_match[] = {
 826         { "INT33E1", 0 },
 827         { },
 828 };
 829 MODULE_DEVICE_TABLE(acpi, intel_acpi_match);
 830
 831 static int intel_acpi_probe(struct intel_device *idev)
 832 {
 833         const struct acpi_device_id *id;
 834
 835         id = acpi_match_device(intel_acpi_match, &idev->pdev->dev);
 836         if (!id)
 837                 return -ENODEV;
 838
 839         return 0;
 840 }
 841 #else
 842 static int intel_acpi_probe(struct intel_device *idev)
 843 {
 844         return -ENODEV;
 845 }
 846 #endif
 847
 848 static int intel_probe(struct platform_device *pdev)
 849 {
 850         struct intel_device *idev;
 851
 852         idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
 853         if (!idev)
 854                 return -ENOMEM;
 855
 856         idev->pdev = pdev;
 857
 858         if (ACPI_HANDLE(&pdev->dev)) {
 859                 int err = intel_acpi_probe(idev);
 860                 if (err)
 861                         return err;
 862         } else {
 863                 return -ENODEV;
 864         }
 865
 866         idev->reset = devm_gpiod_get_optional(&pdev->dev, "reset",
 867                                               GPIOD_OUT_LOW);
 868         if (IS_ERR(idev->reset)) {
 869                 dev_err(&pdev->dev, "Unable to retrieve gpio\n");
 870                 return PTR_ERR(idev->reset);
 871         }
 872
 873         idev->irq = platform_get_irq(pdev, 0);
 874         if (idev->irq < 0) {
 875                 struct gpio_desc *host_wake;
 876
 877                 dev_err(&pdev->dev, "No IRQ, falling back to gpio-irq\n");
 878
 879                 host_wake = devm_gpiod_get_optional(&pdev->dev, "host-wake",
 880                                                     GPIOD_IN);
 881                 if (IS_ERR(host_wake)) {
 882                         dev_err(&pdev->dev, "Unable to retrieve IRQ\n");
 883                         goto no_irq;
 884                 }
 885
 886                 idev->irq = gpiod_to_irq(host_wake);
 887                 if (idev->irq < 0) {
 888                         dev_err(&pdev->dev, "No corresponding irq for gpio\n");
 889                         goto no_irq;
 890                 }
 891         }
 892
 893         /* Only enable wake-up/irq when controller is powered */
 894         device_set_wakeup_capable(&pdev->dev, true);
 895         device_wakeup_disable(&pdev->dev);
 896
 897 no_irq:
 898         platform_set_drvdata(pdev, idev);
 899
 900         /* Place this instance on the device list */
 901         spin_lock(&intel_device_list_lock);
 902         list_add_tail(&idev->list, &intel_device_list);
 903         spin_unlock(&intel_device_list_lock);
 904
 905         dev_info(&pdev->dev, "registered, gpio(%d)/irq(%d).\n",
 906                  desc_to_gpio(idev->reset), idev->irq);
 907
 908         return 0;
 909 }
 910
 911 static int intel_remove(struct platform_device *pdev)
 912 {
 913         struct intel_device *idev = platform_get_drvdata(pdev);
 914
 915         device_wakeup_disable(&pdev->dev);
 916
 917         spin_lock(&intel_device_list_lock);
 918         list_del(&idev->list);
 919         spin_unlock(&intel_device_list_lock);
 920
 921         dev_info(&pdev->dev, "unregistered.\n");
 922
 923         return 0;
 924 }
 925
 926 static struct platform_driver intel_driver = {
 927         .probe = intel_probe,
 928         .remove = intel_remove,
 929         .driver = {
 930                 .name = "hci_intel",
 931                 .acpi_match_table = ACPI_PTR(intel_acpi_match),
 932         },
 933 };
 934
 935 int __init intel_init(void)
 936 {
 937         platform_driver_register(&intel_driver);
 938
 939         return hci_uart_register_proto(&intel_proto);
 940 }
 941
 942 int __exit intel_deinit(void)
 943 {
 944         platform_driver_unregister(&intel_driver);
 945
 946         return hci_uart_unregister_proto(&intel_proto);
 947 }