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         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
 283         if (!bcm)
 284                 return -ENOMEM;
 285
 286         skb_queue_head_init(&bcm->txq);
 287
 288         hu->priv = bcm;
 289
 290         mutex_lock(&bcm_device_lock);
 291         list_for_each(p, &bcm_device_list) {
 292                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 293
 294                 /* Retrieve saved bcm_device based on parent of the
 295                  * platform device (saved during device probe) and
 296                  * parent of tty device used by hci_uart
 297                  */
 298                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
 299                         bcm->dev = dev;
 300                         hu->init_speed = dev->init_speed;
 301 #ifdef CONFIG_PM
 302                         dev->hu = hu;
 303 #endif
 304                         bcm_gpio_set_power(bcm->dev, true);
 305                         break;
 306                 }
 307         }
 308
 309         mutex_unlock(&bcm_device_lock);
 310
 311         return 0;
 312 }
 313
 314 static int bcm_close(struct hci_uart *hu)
 315 {
 316         struct bcm_data *bcm = hu->priv;
 317         struct bcm_device *bdev = bcm->dev;
 318
 319         bt_dev_dbg(hu->hdev, "hu %p", hu);
 320
 321         /* Protect bcm->dev against removal of the device or driver */
 322         mutex_lock(&bcm_device_lock);
 323         if (bcm_device_exists(bdev)) {
 324                 bcm_gpio_set_power(bdev, false);
 325 #ifdef CONFIG_PM
 326                 pm_runtime_disable(&bdev->pdev->dev);
 327                 pm_runtime_set_suspended(&bdev->pdev->dev);
 328
 329                 if (device_can_wakeup(&bdev->pdev->dev)) {
 330                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
 331                         device_init_wakeup(&bdev->pdev->dev, false);
 332                 }
 333
 334                 bdev->hu = NULL;
 335 #endif
 336         }
 337         mutex_unlock(&bcm_device_lock);
 338
 339         skb_queue_purge(&bcm->txq);
 340         kfree_skb(bcm->rx_skb);
 341         kfree(bcm);
 342
 343         hu->priv = NULL;
 344         return 0;
 345 }
 346
 347 static int bcm_flush(struct hci_uart *hu)
 348 {
 349         struct bcm_data *bcm = hu->priv;
 350
 351         bt_dev_dbg(hu->hdev, "hu %p", hu);
 352
 353         skb_queue_purge(&bcm->txq);
 354
 355         return 0;
 356 }
 357
 358 static int bcm_setup(struct hci_uart *hu)
 359 {
 360         struct bcm_data *bcm = hu->priv;
 361         char fw_name[64];
 362         const struct firmware *fw;
 363         unsigned int speed;
 364         int err;
 365
 366         bt_dev_dbg(hu->hdev, "hu %p", hu);
 367
 368         hu->hdev->set_diag = bcm_set_diag;
 369         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 370
 371         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
 372         if (err)
 373                 return err;
 374
 375         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
 376         if (err < 0) {
 377                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
 378                 return 0;
 379         }
 380
 381         err = btbcm_patchram(hu->hdev, fw);
 382         if (err) {
 383                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
 384                 goto finalize;
 385         }
 386
 387         /* Init speed if any */
 388         if (hu->init_speed)
 389                 speed = hu->init_speed;
 390         else if (hu->proto->init_speed)
 391                 speed = hu->proto->init_speed;
 392         else
 393                 speed = 0;
 394
 395         if (speed)
 396                 hci_uart_set_baudrate(hu, speed);
 397
 398         /* Operational speed if any */
 399         if (hu->oper_speed)
 400                 speed = hu->oper_speed;
 401         else if (hu->proto->oper_speed)
 402                 speed = hu->proto->oper_speed;
 403         else
 404                 speed = 0;
 405
 406         if (speed) {
 407                 err = bcm_set_baudrate(hu, speed);
 408                 if (!err)
 409                         hci_uart_set_baudrate(hu, speed);
 410         }
 411
 412 finalize:
 413         release_firmware(fw);
 414
 415         err = btbcm_finalize(hu->hdev);
 416         if (err)
 417                 return err;
 418
 419         err = bcm_request_irq(bcm);
 420         if (!err)
 421                 err = bcm_setup_sleep(hu);
 422
 423         return err;
 424 }
 425
 426 #define BCM_RECV_LM_DIAG \
 427         .type = BCM_LM_DIAG_PKT, \
 428         .hlen = BCM_LM_DIAG_SIZE, \
 429         .loff = 0, \
 430         .lsize = 0, \
 431         .maxlen = BCM_LM_DIAG_SIZE
 432
 433 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 434         { H4_RECV_ACL,      .recv = hci_recv_frame },
 435         { H4_RECV_SCO,      .recv = hci_recv_frame },
 436         { H4_RECV_EVENT,    .recv = hci_recv_frame },
 437         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 438 };
 439
 440 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
 441 {
 442         struct bcm_data *bcm = hu->priv;
 443
 444         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 445                 return -EUNATCH;
 446
 447         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 448                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 449         if (IS_ERR(bcm->rx_skb)) {
 450                 int err = PTR_ERR(bcm->rx_skb);
 451                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 452                 bcm->rx_skb = NULL;
 453                 return err;
 454         } else if (!bcm->rx_skb) {
 455                 /* Delay auto-suspend when receiving completed packet */
 456                 mutex_lock(&bcm_device_lock);
 457                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
 458                         pm_runtime_get(&bcm->dev->pdev->dev);
 459                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
 460                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
 461                 }
 462                 mutex_unlock(&bcm_device_lock);
 463         }
 464
 465         return count;
 466 }
 467
 468 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 469 {
 470         struct bcm_data *bcm = hu->priv;
 471
 472         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
 473
 474         /* Prepend skb with frame type */
 475         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 476         skb_queue_tail(&bcm->txq, skb);
 477
 478         return 0;
 479 }
 480
 481 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 482 {
 483         struct bcm_data *bcm = hu->priv;
 484         struct sk_buff *skb = NULL;
 485         struct bcm_device *bdev = NULL;
 486
 487         mutex_lock(&bcm_device_lock);
 488
 489         if (bcm_device_exists(bcm->dev)) {
 490                 bdev = bcm->dev;
 491                 pm_runtime_get_sync(&bdev->pdev->dev);
 492                 /* Shall be resumed here */
 493         }
 494
 495         skb = skb_dequeue(&bcm->txq);
 496
 497         if (bdev) {
 498                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
 499                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
 500         }
 501
 502         mutex_unlock(&bcm_device_lock);
 503
 504         return skb;
 505 }
 506
 507 #ifdef CONFIG_PM
 508 static int bcm_suspend_device(struct device *dev)
 509 {
 510         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 511
 512         bt_dev_dbg(bdev, "");
 513
 514         if (!bdev->is_suspended && bdev->hu) {
 515                 hci_uart_set_flow_control(bdev->hu, true);
 516
 517                 /* Once this returns, driver suspends BT via GPIO */
 518                 bdev->is_suspended = true;
 519         }
 520
 521         /* Suspend the device */
 522         if (bdev->device_wakeup) {
 523                 gpiod_set_value(bdev->device_wakeup, false);
 524                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
 525                 mdelay(15);
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int bcm_resume_device(struct device *dev)
 532 {
 533         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 534
 535         bt_dev_dbg(bdev, "");
 536
 537         if (bdev->device_wakeup) {
 538                 gpiod_set_value(bdev->device_wakeup, true);
 539                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
 540                 mdelay(15);
 541         }
 542
 543         /* When this executes, the device has woken up already */
 544         if (bdev->is_suspended && bdev->hu) {
 545                 bdev->is_suspended = false;
 546
 547                 hci_uart_set_flow_control(bdev->hu, false);
 548         }
 549
 550         return 0;
 551 }
 552 #endif
 553
 554 #ifdef CONFIG_PM_SLEEP
 555 /* Platform suspend callback */
 556 static int bcm_suspend(struct device *dev)
 557 {
 558         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 559         int error;
 560
 561         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
 562
 563         /* bcm_suspend can be called at any time as long as platform device is
 564          * bound, so it should use bcm_device_lock to protect access to hci_uart
 565          * and device_wake-up GPIO.
 566          */
 567         mutex_lock(&bcm_device_lock);
 568
 569         if (!bdev->hu)
 570                 goto unlock;
 571
 572         if (pm_runtime_active(dev))
 573                 bcm_suspend_device(dev);
 574
 575         if (device_may_wakeup(&bdev->pdev->dev)) {
 576                 error = enable_irq_wake(bdev->irq);
 577                 if (!error)
 578                         bt_dev_dbg(bdev, "BCM irq: enabled");
 579         }
 580
 581 unlock:
 582         mutex_unlock(&bcm_device_lock);
 583
 584         return 0;
 585 }
 586
 587 /* Platform resume callback */
 588 static int bcm_resume(struct device *dev)
 589 {
 590         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 591
 592         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
 593
 594         /* bcm_resume can be called at any time as long as platform device is
 595          * bound, so it should use bcm_device_lock to protect access to hci_uart
 596          * and device_wake-up GPIO.
 597          */
 598         mutex_lock(&bcm_device_lock);
 599
 600         if (!bdev->hu)
 601                 goto unlock;
 602
 603         if (device_may_wakeup(&bdev->pdev->dev)) {
 604                 disable_irq_wake(bdev->irq);
 605                 bt_dev_dbg(bdev, "BCM irq: disabled");
 606         }
 607
 608         bcm_resume_device(dev);
 609
 610 unlock:
 611         mutex_unlock(&bcm_device_lock);
 612
 613         pm_runtime_disable(dev);
 614         pm_runtime_set_active(dev);
 615         pm_runtime_enable(dev);
 616
 617         return 0;
 618 }
 619 #endif
 620
 621 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
 622 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
 623 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
 624
 625 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
 626         { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
 627         { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
 628         { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
 629         { },
 630 };
 631
 632 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
 633 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
 634 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
 635
 636 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
 637         { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
 638         { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
 639         { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
 640         { },
 641 };
 642
 643 #ifdef CONFIG_ACPI
 644 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
 645
 646 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 647 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
 648         {
 649                 .ident = "Asus T100TA",
 650                 .matches = {
 651                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 652                                         "ASUSTeK COMPUTER INC."),
 653                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 654                 },
 655                 .driver_data = &acpi_active_low,
 656         },
 657         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
 658                 .ident = "Lenovo ThinkPad 8",
 659                 .matches = {
 660                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 661                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
 662                 },
 663                 .driver_data = &acpi_active_low,
 664         },
 665         { }
 666 };
 667
 668 static int bcm_resource(struct acpi_resource *ares, void *data)
 669 {
 670         struct bcm_device *dev = data;
 671         struct acpi_resource_extended_irq *irq;
 672         struct acpi_resource_gpio *gpio;
 673         struct acpi_resource_uart_serialbus *sb;
 674
 675         switch (ares->type) {
 676         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 677                 irq = &ares->data.extended_irq;
 678                 dev->irq_polarity = irq->polarity;
 679                 break;
 680
 681         case ACPI_RESOURCE_TYPE_GPIO:
 682                 gpio = &ares->data.gpio;
 683                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
 684                         dev->irq_polarity = gpio->polarity;
 685                 break;
 686
 687         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 688                 sb = &ares->data.uart_serial_bus;
 689                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 690                         dev->init_speed = sb->default_baud_rate;
 691                 break;
 692
 693         default:
 694                 break;
 695         }
 696
 697         /* Always tell the ACPI core to skip this resource */
 698         return 1;
 699 }
 700
 701 static int bcm_acpi_probe(struct bcm_device *dev)
 702 {
 703         struct platform_device *pdev = dev->pdev;
 704         LIST_HEAD(resources);
 705         const struct dmi_system_id *dmi_id;
 706         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
 707         const struct acpi_device_id *id;
 708         int ret;
 709
 710         dev->name = dev_name(&pdev->dev);
 711
 712         /* Retrieve GPIO data */
 713         id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
 714         if (id)
 715                 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
 716
 717         ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
 718                                         gpio_mapping);
 719         if (ret)
 720                 return ret;
 721
 722         dev->clk = devm_clk_get(&pdev->dev, NULL);
 723
 724         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 725                                                      "device-wakeup",
 726                                                      GPIOD_OUT_LOW);
 727         if (IS_ERR(dev->device_wakeup))
 728                 return PTR_ERR(dev->device_wakeup);
 729
 730         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 731                                                 GPIOD_OUT_LOW);
 732         if (IS_ERR(dev->shutdown))
 733                 return PTR_ERR(dev->shutdown);
 734
 735         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
 736         dev->irq = platform_get_irq(pdev, 0);
 737         if (dev->irq <= 0) {
 738                 struct gpio_desc *gpio;
 739
 740                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
 741                                                GPIOD_IN);
 742                 if (IS_ERR(gpio))
 743                         return PTR_ERR(gpio);
 744
 745                 dev->irq = gpiod_to_irq(gpio);
 746         }
 747
 748         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
 749
 750         /* Make sure at-least one of the GPIO is defined and that
 751          * a name is specified for this instance
 752          */
 753         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 754                 dev_err(&pdev->dev, "invalid platform data\n");
 755                 return -EINVAL;
 756         }
 757
 758         /* Retrieve UART ACPI info */
 759         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
 760                                      &resources, bcm_resource, dev);
 761         if (ret < 0)
 762                 return ret;
 763         acpi_dev_free_resource_list(&resources);
 764
 765         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
 766         if (dmi_id) {
 767                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
 768                             dmi_id->ident);
 769                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
 770         }
 771
 772         return 0;
 773 }
 774 #else
 775 static int bcm_acpi_probe(struct bcm_device *dev)
 776 {
 777         return -EINVAL;
 778 }
 779 #endif /* CONFIG_ACPI */
 780
 781 static int bcm_probe(struct platform_device *pdev)
 782 {
 783         struct bcm_device *dev;
 784         int ret;
 785
 786         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 787         if (!dev)
 788                 return -ENOMEM;
 789
 790         dev->pdev = pdev;
 791
 792         ret = bcm_acpi_probe(dev);
 793         if (ret)
 794                 return ret;
 795
 796         platform_set_drvdata(pdev, dev);
 797
 798         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
 799
 800         /* Place this instance on the device list */
 801         mutex_lock(&bcm_device_lock);
 802         list_add_tail(&dev->list, &bcm_device_list);
 803         mutex_unlock(&bcm_device_lock);
 804
 805         bcm_gpio_set_power(dev, false);
 806
 807         return 0;
 808 }
 809
 810 static int bcm_remove(struct platform_device *pdev)
 811 {
 812         struct bcm_device *dev = platform_get_drvdata(pdev);
 813
 814         mutex_lock(&bcm_device_lock);
 815         list_del(&dev->list);
 816         mutex_unlock(&bcm_device_lock);
 817
 818         acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
 819
 820         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
 821
 822         return 0;
 823 }
 824
 825 static const struct hci_uart_proto bcm_proto = {
 826         .id             = HCI_UART_BCM,
 827         .name           = "Broadcom",
 828         .manufacturer   = 15,
 829         .init_speed     = 115200,
 830         .oper_speed     = 4000000,
 831         .open           = bcm_open,
 832         .close          = bcm_close,
 833         .flush          = bcm_flush,
 834         .setup          = bcm_setup,
 835         .set_baudrate   = bcm_set_baudrate,
 836         .recv           = bcm_recv,
 837         .enqueue        = bcm_enqueue,
 838         .dequeue        = bcm_dequeue,
 839 };
 840
 841 #ifdef CONFIG_ACPI
 842 static const struct acpi_device_id bcm_acpi_match[] = {
 843         { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 844         { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 845         { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 846         { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 847         { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 848         { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 849         { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 850         { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 851         { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 852         { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 853         { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 854         { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 855         { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 856         { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 857         { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 858         { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 859         { },
 860 };
 861 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 862 #endif
 863
 864 /* Platform suspend and resume callbacks */
 865 static const struct dev_pm_ops bcm_pm_ops = {
 866         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
 867         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
 868 };
 869
 870 static struct platform_driver bcm_driver = {
 871         .probe = bcm_probe,
 872         .remove = bcm_remove,
 873         .driver = {
 874                 .name = "hci_bcm",
 875                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
 876                 .pm = &bcm_pm_ops,
 877         },
 878 };
 879
 880 int __init bcm_init(void)
 881 {
 882         platform_driver_register(&bcm_driver);
 883
 884         return hci_uart_register_proto(&bcm_proto);
 885 }
 886
 887 int __exit bcm_deinit(void)
 888 {
 889         platform_driver_unregister(&bcm_driver);
 890
 891         return hci_uart_unregister_proto(&bcm_proto);
 892 }