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