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