drivers/bluetooth/hci_bcm.c

   1 /*
   2  *
   3  *  Bluetooth HCI UART driver for Broadcom 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/acpi.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/clk.h>
  32 #include <linux/gpio/consumer.h>
  33 #include <linux/tty.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/dmi.h>
  36 #include <linux/pm_runtime.h>
  37
  38 #include <net/bluetooth/bluetooth.h>
  39 #include <net/bluetooth/hci_core.h>
  40
  41 #include "btbcm.h"
  42 #include "hci_uart.h"
  43
  44 #define BCM_LM_DIAG_PKT 0x07
  45 #define BCM_LM_DIAG_SIZE 63
  46
  47 #define BCM_AUTOSUSPEND_DELAY   5000 /* default autosleep delay */
  48
  49 struct bcm_device {
  50         struct list_head        list;
  51
  52         struct platform_device  *pdev;
  53
  54         const char              *name;
  55         struct gpio_desc        *device_wakeup;
  56         struct gpio_desc        *shutdown;
  57
  58         struct clk              *clk;
  59         bool                    clk_enabled;
  60
  61         u32                     init_speed;
  62         int                     irq;
  63         u8                      irq_polarity;
  64
  65 #ifdef CONFIG_PM
  66         struct hci_uart         *hu;
  67         bool                    is_suspended; /* suspend/resume flag */
  68 #endif
  69 };
  70
  71 struct bcm_data {
  72         struct sk_buff          *rx_skb;
  73         struct sk_buff_head     txq;
  74
  75         struct bcm_device       *dev;
  76 };
  77
  78 /* List of BCM BT UART devices */
  79 static DEFINE_MUTEX(bcm_device_lock);
  80 static LIST_HEAD(bcm_device_list);
  81
  82 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
  83 {
  84         struct hci_dev *hdev = hu->hdev;
  85         struct sk_buff *skb;
  86         struct bcm_update_uart_baud_rate param;
  87
  88         if (speed > 3000000) {
  89                 struct bcm_write_uart_clock_setting clock;
  90
  91                 clock.type = BCM_UART_CLOCK_48MHZ;
  92
  93                 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
  94
  95                 /* This Broadcom specific command changes the UART's controller
  96                  * clock for baud rate > 3000000.
  97                  */
  98                 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
  99                 if (IS_ERR(skb)) {
 100                         int err = PTR_ERR(skb);
 101                         bt_dev_err(hdev, "BCM: failed to write clock (%d)",
 102                                    err);
 103                         return err;
 104                 }
 105
 106                 kfree_skb(skb);
 107         }
 108
 109         bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
 110
 111         param.zero = cpu_to_le16(0);
 112         param.baud_rate = cpu_to_le32(speed);
 113
 114         /* This Broadcom specific command changes the UART's controller baud
 115          * rate.
 116          */
 117         skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
 118                              HCI_INIT_TIMEOUT);
 119         if (IS_ERR(skb)) {
 120                 int err = PTR_ERR(skb);
 121                 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
 122                            err);
 123                 return err;
 124         }
 125
 126         kfree_skb(skb);
 127
 128         return 0;
 129 }
 130
 131 /* bcm_device_exists should be protected by bcm_device_lock */
 132 static bool bcm_device_exists(struct bcm_device *device)
 133 {
 134         struct list_head *p;
 135
 136         list_for_each(p, &bcm_device_list) {
 137                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 138
 139                 if (device == dev)
 140                         return true;
 141         }
 142
 143         return false;
 144 }
 145
 146 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
 147 {
 148         if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
 149                 clk_enable(dev->clk);
 150
 151         gpiod_set_value(dev->shutdown, powered);
 152         gpiod_set_value(dev->device_wakeup, powered);
 153
 154         if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
 155                 clk_disable(dev->clk);
 156
 157         dev->clk_enabled = powered;
 158
 159         return 0;
 160 }
 161
 162 #ifdef CONFIG_PM
 163 static irqreturn_t bcm_host_wake(int irq, void *data)
 164 {
 165         struct bcm_device *bdev = data;
 166
 167         bt_dev_dbg(bdev, "Host wake IRQ");
 168
 169         pm_runtime_get(&bdev->pdev->dev);
 170         pm_runtime_mark_last_busy(&bdev->pdev->dev);
 171         pm_runtime_put_autosuspend(&bdev->pdev->dev);
 172
 173         return IRQ_HANDLED;
 174 }
 175
 176 static int bcm_request_irq(struct bcm_data *bcm)
 177 {
 178         struct bcm_device *bdev = bcm->dev;
 179         int err = 0;
 180
 181         /* If this is not a platform device, do not enable PM functionalities */
 182         mutex_lock(&bcm_device_lock);
 183         if (!bcm_device_exists(bdev)) {
 184                 err = -ENODEV;
 185                 goto unlock;
 186         }
 187
 188         if (bdev->irq > 0) {
 189                 err = devm_request_irq(&bdev->pdev->dev, bdev->irq,
 190                                        bcm_host_wake, IRQF_TRIGGER_RISING,
 191                                        "host_wake", bdev);
 192                 if (err)
 193                         goto unlock;
 194
 195                 device_init_wakeup(&bdev->pdev->dev, true);
 196
 197                 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
 198                                                  BCM_AUTOSUSPEND_DELAY);
 199                 pm_runtime_use_autosuspend(&bdev->pdev->dev);
 200                 pm_runtime_set_active(&bdev->pdev->dev);
 201                 pm_runtime_enable(&bdev->pdev->dev);
 202         }
 203
 204 unlock:
 205         mutex_unlock(&bcm_device_lock);
 206
 207         return err;
 208 }
 209
 210 static const struct bcm_set_sleep_mode default_sleep_params = {
 211         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
 212         .idle_host = 2,         /* idle threshold HOST, in 300ms */
 213         .idle_dev = 2,          /* idle threshold device, in 300ms */
 214         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
 215         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
 216         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
 217         .combine_modes = 1,     /* Combine sleep and LPM flag */
 218         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
 219         /* Irrelevant USB flags */
 220         .usb_auto_sleep = 0,
 221         .usb_resume_timeout = 0,
 222         .pulsed_host_wake = 0,
 223         .break_to_host = 0
 224 };
 225
 226 static int bcm_setup_sleep(struct hci_uart *hu)
 227 {
 228         struct bcm_data *bcm = hu->priv;
 229         struct sk_buff *skb;
 230         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
 231
 232         sleep_params.host_wake_active = !bcm->dev->irq_polarity;
 233
 234         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
 235                              &sleep_params, HCI_INIT_TIMEOUT);
 236         if (IS_ERR(skb)) {
 237                 int err = PTR_ERR(skb);
 238                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
 239                 return err;
 240         }
 241         kfree_skb(skb);
 242
 243         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
 244
 245         return 0;
 246 }
 247 #else
 248 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
 249 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
 250 #endif
 251
 252 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
 253 {
 254         struct hci_uart *hu = hci_get_drvdata(hdev);
 255         struct bcm_data *bcm = hu->priv;
 256         struct sk_buff *skb;
 257
 258         if (!test_bit(HCI_RUNNING, &hdev->flags))
 259                 return -ENETDOWN;
 260
 261         skb = bt_skb_alloc(3, GFP_KERNEL);
 262         if (!skb)
 263                 return -ENOMEM;
 264
 265         *skb_put(skb, 1) = BCM_LM_DIAG_PKT;
 266         *skb_put(skb, 1) = 0xf0;
 267         *skb_put(skb, 1) = enable;
 268
 269         skb_queue_tail(&bcm->txq, skb);
 270         hci_uart_tx_wakeup(hu);
 271
 272         return 0;
 273 }
 274
 275 static int bcm_open(struct hci_uart *hu)
 276 {
 277         struct bcm_data *bcm;
 278         struct list_head *p;
 279
 280         bt_dev_dbg(hu->hdev, "hu %p", hu);
 281
 282         if (!hci_uart_has_flow_control(hu))
 283                 return -EOPNOTSUPP;
 284
 285         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
 286         if (!bcm)
 287                 return -ENOMEM;
 288
 289         skb_queue_head_init(&bcm->txq);
 290
 291         hu->priv = bcm;
 292
 293         if (!hu->tty->dev)
 294                 goto out;
 295
 296         mutex_lock(&bcm_device_lock);
 297         list_for_each(p, &bcm_device_list) {
 298                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 299
 300                 /* Retrieve saved bcm_device based on parent of the
 301                  * platform device (saved during device probe) and
 302                  * parent of tty device used by hci_uart
 303                  */
 304                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
 305                         bcm->dev = dev;
 306                         hu->init_speed = dev->init_speed;
 307 #ifdef CONFIG_PM
 308                         dev->hu = hu;
 309 #endif
 310                         bcm_gpio_set_power(bcm->dev, true);
 311                         break;
 312                 }
 313         }
 314
 315         mutex_unlock(&bcm_device_lock);
 316 out:
 317         return 0;
 318 }
 319
 320 static int bcm_close(struct hci_uart *hu)
 321 {
 322         struct bcm_data *bcm = hu->priv;
 323         struct bcm_device *bdev = bcm->dev;
 324
 325         bt_dev_dbg(hu->hdev, "hu %p", hu);
 326
 327         /* Protect bcm->dev against removal of the device or driver */
 328         mutex_lock(&bcm_device_lock);
 329         if (bcm_device_exists(bdev)) {
 330                 bcm_gpio_set_power(bdev, false);
 331 #ifdef CONFIG_PM
 332                 pm_runtime_disable(&bdev->pdev->dev);
 333                 pm_runtime_set_suspended(&bdev->pdev->dev);
 334
 335                 if (device_can_wakeup(&bdev->pdev->dev)) {
 336                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
 337                         device_init_wakeup(&bdev->pdev->dev, false);
 338                 }
 339
 340                 bdev->hu = NULL;
 341 #endif
 342         }
 343         mutex_unlock(&bcm_device_lock);
 344
 345         skb_queue_purge(&bcm->txq);
 346         kfree_skb(bcm->rx_skb);
 347         kfree(bcm);
 348
 349         hu->priv = NULL;
 350         return 0;
 351 }
 352
 353 static int bcm_flush(struct hci_uart *hu)
 354 {
 355         struct bcm_data *bcm = hu->priv;
 356
 357         bt_dev_dbg(hu->hdev, "hu %p", hu);
 358
 359         skb_queue_purge(&bcm->txq);
 360
 361         return 0;
 362 }
 363
 364 static int bcm_setup(struct hci_uart *hu)
 365 {
 366         struct bcm_data *bcm = hu->priv;
 367         char fw_name[64];
 368         const struct firmware *fw;
 369         unsigned int speed;
 370         int err;
 371
 372         bt_dev_dbg(hu->hdev, "hu %p", hu);
 373
 374         hu->hdev->set_diag = bcm_set_diag;
 375         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 376
 377         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
 378         if (err)
 379                 return err;
 380
 381         err = reject_firmware(&fw, fw_name, &hu->hdev->dev);
 382         if (err < 0) {
 383                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
 384                 return 0;
 385         }
 386
 387         err = btbcm_patchram(hu->hdev, fw);
 388         if (err) {
 389                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
 390                 goto finalize;
 391         }
 392
 393         /* Init speed if any */
 394         if (hu->init_speed)
 395                 speed = hu->init_speed;
 396         else if (hu->proto->init_speed)
 397                 speed = hu->proto->init_speed;
 398         else
 399                 speed = 0;
 400
 401         if (speed)
 402                 hci_uart_set_baudrate(hu, speed);
 403
 404         /* Operational speed if any */
 405         if (hu->oper_speed)
 406                 speed = hu->oper_speed;
 407         else if (hu->proto->oper_speed)
 408                 speed = hu->proto->oper_speed;
 409         else
 410                 speed = 0;
 411
 412         if (speed) {
 413                 err = bcm_set_baudrate(hu, speed);
 414                 if (!err)
 415                         hci_uart_set_baudrate(hu, speed);
 416         }
 417
 418 finalize:
 419         release_firmware(fw);
 420
 421         err = btbcm_finalize(hu->hdev);
 422         if (err)
 423                 return err;
 424
 425         err = bcm_request_irq(bcm);
 426         if (!err)
 427                 err = bcm_setup_sleep(hu);
 428
 429         return err;
 430 }
 431
 432 #define BCM_RECV_LM_DIAG \
 433         .type = BCM_LM_DIAG_PKT, \
 434         .hlen = BCM_LM_DIAG_SIZE, \
 435         .loff = 0, \
 436         .lsize = 0, \
 437         .maxlen = BCM_LM_DIAG_SIZE
 438
 439 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 440         { H4_RECV_ACL,      .recv = hci_recv_frame },
 441         { H4_RECV_SCO,      .recv = hci_recv_frame },
 442         { H4_RECV_EVENT,    .recv = hci_recv_frame },
 443         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 444 };
 445
 446 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
 447 {
 448         struct bcm_data *bcm = hu->priv;
 449
 450         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 451                 return -EUNATCH;
 452
 453         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 454                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 455         if (IS_ERR(bcm->rx_skb)) {
 456                 int err = PTR_ERR(bcm->rx_skb);
 457                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 458                 bcm->rx_skb = NULL;
 459                 return err;
 460         } else if (!bcm->rx_skb) {
 461                 /* Delay auto-suspend when receiving completed packet */
 462                 mutex_lock(&bcm_device_lock);
 463                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
 464                         pm_runtime_get(&bcm->dev->pdev->dev);
 465                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
 466                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
 467                 }
 468                 mutex_unlock(&bcm_device_lock);
 469         }
 470
 471         return count;
 472 }
 473
 474 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 475 {
 476         struct bcm_data *bcm = hu->priv;
 477
 478         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
 479
 480         /* Prepend skb with frame type */
 481         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 482         skb_queue_tail(&bcm->txq, skb);
 483
 484         return 0;
 485 }
 486
 487 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 488 {
 489         struct bcm_data *bcm = hu->priv;
 490         struct sk_buff *skb = NULL;
 491         struct bcm_device *bdev = NULL;
 492
 493         mutex_lock(&bcm_device_lock);
 494
 495         if (bcm_device_exists(bcm->dev)) {
 496                 bdev = bcm->dev;
 497                 pm_runtime_get_sync(&bdev->pdev->dev);
 498                 /* Shall be resumed here */
 499         }
 500
 501         skb = skb_dequeue(&bcm->txq);
 502
 503         if (bdev) {
 504                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
 505                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
 506         }
 507
 508         mutex_unlock(&bcm_device_lock);
 509
 510         return skb;
 511 }
 512
 513 #ifdef CONFIG_PM
 514 static int bcm_suspend_device(struct device *dev)
 515 {
 516         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 517
 518         bt_dev_dbg(bdev, "");
 519
 520         if (!bdev->is_suspended && bdev->hu) {
 521                 hci_uart_set_flow_control(bdev->hu, true);
 522
 523                 /* Once this returns, driver suspends BT via GPIO */
 524                 bdev->is_suspended = true;
 525         }
 526
 527         /* Suspend the device */
 528         if (bdev->device_wakeup) {
 529                 gpiod_set_value(bdev->device_wakeup, false);
 530                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
 531                 mdelay(15);
 532         }
 533
 534         return 0;
 535 }
 536
 537 static int bcm_resume_device(struct device *dev)
 538 {
 539         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 540
 541         bt_dev_dbg(bdev, "");
 542
 543         if (bdev->device_wakeup) {
 544                 gpiod_set_value(bdev->device_wakeup, true);
 545                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
 546                 mdelay(15);
 547         }
 548
 549         /* When this executes, the device has woken up already */
 550         if (bdev->is_suspended && bdev->hu) {
 551                 bdev->is_suspended = false;
 552
 553                 hci_uart_set_flow_control(bdev->hu, false);
 554         }
 555
 556         return 0;
 557 }
 558 #endif
 559
 560 #ifdef CONFIG_PM_SLEEP
 561 /* Platform suspend callback */
 562 static int bcm_suspend(struct device *dev)
 563 {
 564         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 565         int error;
 566
 567         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
 568
 569         /* bcm_suspend can be called at any time as long as platform device is
 570          * bound, so it should use bcm_device_lock to protect access to hci_uart
 571          * and device_wake-up GPIO.
 572          */
 573         mutex_lock(&bcm_device_lock);
 574
 575         if (!bdev->hu)
 576                 goto unlock;
 577
 578         if (pm_runtime_active(dev))
 579                 bcm_suspend_device(dev);
 580
 581         if (device_may_wakeup(&bdev->pdev->dev)) {
 582                 error = enable_irq_wake(bdev->irq);
 583                 if (!error)
 584                         bt_dev_dbg(bdev, "BCM irq: enabled");
 585         }
 586
 587 unlock:
 588         mutex_unlock(&bcm_device_lock);
 589
 590         return 0;
 591 }
 592
 593 /* Platform resume callback */
 594 static int bcm_resume(struct device *dev)
 595 {
 596         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 597
 598         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
 599
 600         /* bcm_resume can be called at any time as long as platform device is
 601          * bound, so it should use bcm_device_lock to protect access to hci_uart
 602          * and device_wake-up GPIO.
 603          */
 604         mutex_lock(&bcm_device_lock);
 605
 606         if (!bdev->hu)
 607                 goto unlock;
 608
 609         if (device_may_wakeup(&bdev->pdev->dev)) {
 610                 disable_irq_wake(bdev->irq);
 611                 bt_dev_dbg(bdev, "BCM irq: disabled");
 612         }
 613
 614         bcm_resume_device(dev);
 615
 616 unlock:
 617         mutex_unlock(&bcm_device_lock);
 618
 619         pm_runtime_disable(dev);
 620         pm_runtime_set_active(dev);
 621         pm_runtime_enable(dev);
 622
 623         return 0;
 624 }
 625 #endif
 626
 627 static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
 628 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
 629 static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
 630
 631 static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
 632         { "device-wakeup-gpios", &device_wakeup_gpios, 1 },
 633         { "shutdown-gpios", &shutdown_gpios, 1 },
 634         { "host-wakeup-gpios", &host_wakeup_gpios, 1 },
 635         { },
 636 };
 637
 638 #ifdef CONFIG_ACPI
 639 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
 640
 641 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 642 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
 643         {
 644                 .ident = "Asus T100TA",
 645                 .matches = {
 646                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 647                                         "ASUSTeK COMPUTER INC."),
 648                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 649                 },
 650                 .driver_data = &acpi_active_low,
 651         },
 652         { }
 653 };
 654
 655 static int bcm_resource(struct acpi_resource *ares, void *data)
 656 {
 657         struct bcm_device *dev = data;
 658         struct acpi_resource_extended_irq *irq;
 659         struct acpi_resource_gpio *gpio;
 660         struct acpi_resource_uart_serialbus *sb;
 661
 662         switch (ares->type) {
 663         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 664                 irq = &ares->data.extended_irq;
 665                 dev->irq_polarity = irq->polarity;
 666                 break;
 667
 668         case ACPI_RESOURCE_TYPE_GPIO:
 669                 gpio = &ares->data.gpio;
 670                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
 671                         dev->irq_polarity = gpio->polarity;
 672                 break;
 673
 674         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 675                 sb = &ares->data.uart_serial_bus;
 676                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 677                         dev->init_speed = sb->default_baud_rate;
 678                 break;
 679
 680         default:
 681                 break;
 682         }
 683
 684         /* Always tell the ACPI core to skip this resource */
 685         return 1;
 686 }
 687
 688 static int bcm_acpi_probe(struct bcm_device *dev)
 689 {
 690         struct platform_device *pdev = dev->pdev;
 691         LIST_HEAD(resources);
 692         const struct dmi_system_id *dmi_id;
 693         int ret;
 694
 695         /* Retrieve GPIO data */
 696         dev->name = dev_name(&pdev->dev);
 697         ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
 698                                         acpi_bcm_default_gpios);
 699         if (ret)
 700                 return ret;
 701
 702         dev->clk = devm_clk_get(&pdev->dev, NULL);
 703
 704         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 705                                                      "device-wakeup",
 706                                                      GPIOD_OUT_LOW);
 707         if (IS_ERR(dev->device_wakeup))
 708                 return PTR_ERR(dev->device_wakeup);
 709
 710         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 711                                                 GPIOD_OUT_LOW);
 712         if (IS_ERR(dev->shutdown))
 713                 return PTR_ERR(dev->shutdown);
 714
 715         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
 716         dev->irq = platform_get_irq(pdev, 0);
 717         if (dev->irq <= 0) {
 718                 struct gpio_desc *gpio;
 719
 720                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
 721                                                GPIOD_IN);
 722                 if (IS_ERR(gpio))
 723                         return PTR_ERR(gpio);
 724
 725                 dev->irq = gpiod_to_irq(gpio);
 726         }
 727
 728         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
 729
 730         /* Make sure at-least one of the GPIO is defined and that
 731          * a name is specified for this instance
 732          */
 733         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 734                 dev_err(&pdev->dev, "invalid platform data\n");
 735                 return -EINVAL;
 736         }
 737
 738         /* Retrieve UART ACPI info */
 739         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
 740                                      &resources, bcm_resource, dev);
 741         if (ret < 0)
 742                 return ret;
 743         acpi_dev_free_resource_list(&resources);
 744
 745         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
 746         if (dmi_id) {
 747                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
 748                             dmi_id->ident);
 749                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
 750         }
 751
 752         return 0;
 753 }
 754 #else
 755 static int bcm_acpi_probe(struct bcm_device *dev)
 756 {
 757         return -EINVAL;
 758 }
 759 #endif /* CONFIG_ACPI */
 760
 761 static int bcm_probe(struct platform_device *pdev)
 762 {
 763         struct bcm_device *dev;
 764         int ret;
 765
 766         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 767         if (!dev)
 768                 return -ENOMEM;
 769
 770         dev->pdev = pdev;
 771
 772         ret = bcm_acpi_probe(dev);
 773         if (ret)
 774                 return ret;
 775
 776         platform_set_drvdata(pdev, dev);
 777
 778         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
 779
 780         /* Place this instance on the device list */
 781         mutex_lock(&bcm_device_lock);
 782         list_add_tail(&dev->list, &bcm_device_list);
 783         mutex_unlock(&bcm_device_lock);
 784
 785         bcm_gpio_set_power(dev, false);
 786
 787         return 0;
 788 }
 789
 790 static int bcm_remove(struct platform_device *pdev)
 791 {
 792         struct bcm_device *dev = platform_get_drvdata(pdev);
 793
 794         mutex_lock(&bcm_device_lock);
 795         list_del(&dev->list);
 796         mutex_unlock(&bcm_device_lock);
 797
 798         acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
 799
 800         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
 801
 802         return 0;
 803 }
 804
 805 static const struct hci_uart_proto bcm_proto = {
 806         .id             = HCI_UART_BCM,
 807         .name           = "BCM",
 808         .manufacturer   = 15,
 809         .init_speed     = 115200,
 810         .oper_speed     = 4000000,
 811         .open           = bcm_open,
 812         .close          = bcm_close,
 813         .flush          = bcm_flush,
 814         .setup          = bcm_setup,
 815         .set_baudrate   = bcm_set_baudrate,
 816         .recv           = bcm_recv,
 817         .enqueue        = bcm_enqueue,
 818         .dequeue        = bcm_dequeue,
 819 };
 820
 821 #ifdef CONFIG_ACPI
 822 static const struct acpi_device_id bcm_acpi_match[] = {
 823         { "BCM2E39", 0 },
 824         { "BCM2E67", 0 },
 825         { },
 826 };
 827 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 828 #endif
 829
 830 /* Platform suspend and resume callbacks */
 831 static const struct dev_pm_ops bcm_pm_ops = {
 832         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
 833         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
 834 };
 835
 836 static struct platform_driver bcm_driver = {
 837         .probe = bcm_probe,
 838         .remove = bcm_remove,
 839         .driver = {
 840                 .name = "hci_bcm",
 841                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
 842                 .pm = &bcm_pm_ops,
 843         },
 844 };
 845
 846 int __init bcm_init(void)
 847 {
 848         platform_driver_register(&bcm_driver);
 849
 850         return hci_uart_register_proto(&bcm_proto);
 851 }
 852
 853 int __exit bcm_deinit(void)
 854 {
 855         platform_driver_unregister(&bcm_driver);
 856
 857         return hci_uart_unregister_proto(&bcm_proto);
 858 }