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_prepare_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_unprepare(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;
 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 = -EOPNOTSUPP;
 190                 goto unlock;
 191         }
 192
 193         err = devm_request_irq(&bdev->pdev->dev, bdev->irq, bcm_host_wake,
 194                                IRQF_TRIGGER_RISING, "host_wake", bdev);
 195         if (err)
 196                 goto unlock;
 197
 198         device_init_wakeup(&bdev->pdev->dev, true);
 199
 200         pm_runtime_set_autosuspend_delay(&bdev->pdev->dev,
 201                                          BCM_AUTOSUSPEND_DELAY);
 202         pm_runtime_use_autosuspend(&bdev->pdev->dev);
 203         pm_runtime_set_active(&bdev->pdev->dev);
 204         pm_runtime_enable(&bdev->pdev->dev);
 205
 206 unlock:
 207         mutex_unlock(&bcm_device_lock);
 208
 209         return err;
 210 }
 211
 212 static const struct bcm_set_sleep_mode default_sleep_params = {
 213         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
 214         .idle_host = 2,         /* idle threshold HOST, in 300ms */
 215         .idle_dev = 2,          /* idle threshold device, in 300ms */
 216         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
 217         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
 218         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
 219         .combine_modes = 1,     /* Combine sleep and LPM flag */
 220         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
 221         /* Irrelevant USB flags */
 222         .usb_auto_sleep = 0,
 223         .usb_resume_timeout = 0,
 224         .pulsed_host_wake = 0,
 225         .break_to_host = 0
 226 };
 227
 228 static int bcm_setup_sleep(struct hci_uart *hu)
 229 {
 230         struct bcm_data *bcm = hu->priv;
 231         struct sk_buff *skb;
 232         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
 233
 234         sleep_params.host_wake_active = !bcm->dev->irq_polarity;
 235
 236         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
 237                              &sleep_params, HCI_INIT_TIMEOUT);
 238         if (IS_ERR(skb)) {
 239                 int err = PTR_ERR(skb);
 240                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
 241                 return err;
 242         }
 243         kfree_skb(skb);
 244
 245         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
 246
 247         return 0;
 248 }
 249 #else
 250 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
 251 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
 252 #endif
 253
 254 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
 255 {
 256         struct hci_uart *hu = hci_get_drvdata(hdev);
 257         struct bcm_data *bcm = hu->priv;
 258         struct sk_buff *skb;
 259
 260         if (!test_bit(HCI_RUNNING, &hdev->flags))
 261                 return -ENETDOWN;
 262
 263         skb = bt_skb_alloc(3, GFP_KERNEL);
 264         if (!skb)
 265                 return -ENOMEM;
 266
 267         skb_put_u8(skb, BCM_LM_DIAG_PKT);
 268         skb_put_u8(skb, 0xf0);
 269         skb_put_u8(skb, enable);
 270
 271         skb_queue_tail(&bcm->txq, skb);
 272         hci_uart_tx_wakeup(hu);
 273
 274         return 0;
 275 }
 276
 277 static int bcm_open(struct hci_uart *hu)
 278 {
 279         struct bcm_data *bcm;
 280         struct list_head *p;
 281
 282         bt_dev_dbg(hu->hdev, "hu %p", hu);
 283
 284         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
 285         if (!bcm)
 286                 return -ENOMEM;
 287
 288         skb_queue_head_init(&bcm->txq);
 289
 290         hu->priv = bcm;
 291
 292         if (!hu->tty->dev)
 293                 goto out;
 294
 295         mutex_lock(&bcm_device_lock);
 296         list_for_each(p, &bcm_device_list) {
 297                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 298
 299                 /* Retrieve saved bcm_device based on parent of the
 300                  * platform device (saved during device probe) and
 301                  * parent of tty device used by hci_uart
 302                  */
 303                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
 304                         bcm->dev = dev;
 305                         hu->init_speed = dev->init_speed;
 306 #ifdef CONFIG_PM
 307                         dev->hu = hu;
 308 #endif
 309                         bcm_gpio_set_power(bcm->dev, true);
 310                         break;
 311                 }
 312         }
 313
 314         mutex_unlock(&bcm_device_lock);
 315 out:
 316         return 0;
 317 }
 318
 319 static int bcm_close(struct hci_uart *hu)
 320 {
 321         struct bcm_data *bcm = hu->priv;
 322         struct bcm_device *bdev = bcm->dev;
 323
 324         bt_dev_dbg(hu->hdev, "hu %p", hu);
 325
 326         /* Protect bcm->dev against removal of the device or driver */
 327         mutex_lock(&bcm_device_lock);
 328         if (bcm_device_exists(bdev)) {
 329                 bcm_gpio_set_power(bdev, false);
 330 #ifdef CONFIG_PM
 331                 pm_runtime_disable(&bdev->pdev->dev);
 332                 pm_runtime_set_suspended(&bdev->pdev->dev);
 333
 334                 if (device_can_wakeup(&bdev->pdev->dev)) {
 335                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
 336                         device_init_wakeup(&bdev->pdev->dev, false);
 337                 }
 338
 339                 bdev->hu = NULL;
 340 #endif
 341         }
 342         mutex_unlock(&bcm_device_lock);
 343
 344         skb_queue_purge(&bcm->txq);
 345         kfree_skb(bcm->rx_skb);
 346         kfree(bcm);
 347
 348         hu->priv = NULL;
 349         return 0;
 350 }
 351
 352 static int bcm_flush(struct hci_uart *hu)
 353 {
 354         struct bcm_data *bcm = hu->priv;
 355
 356         bt_dev_dbg(hu->hdev, "hu %p", hu);
 357
 358         skb_queue_purge(&bcm->txq);
 359
 360         return 0;
 361 }
 362
 363 static int bcm_setup(struct hci_uart *hu)
 364 {
 365         struct bcm_data *bcm = hu->priv;
 366         char fw_name[64];
 367         const struct firmware *fw;
 368         unsigned int speed;
 369         int err;
 370
 371         bt_dev_dbg(hu->hdev, "hu %p", hu);
 372
 373         hu->hdev->set_diag = bcm_set_diag;
 374         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 375
 376         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
 377         if (err)
 378                 return err;
 379
 380         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
 381         if (err < 0) {
 382                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
 383                 return 0;
 384         }
 385
 386         err = btbcm_patchram(hu->hdev, fw);
 387         if (err) {
 388                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
 389                 goto finalize;
 390         }
 391
 392         /* Init speed if any */
 393         if (hu->init_speed)
 394                 speed = hu->init_speed;
 395         else if (hu->proto->init_speed)
 396                 speed = hu->proto->init_speed;
 397         else
 398                 speed = 0;
 399
 400         if (speed)
 401                 hci_uart_set_baudrate(hu, speed);
 402
 403         /* Operational speed if any */
 404         if (hu->oper_speed)
 405                 speed = hu->oper_speed;
 406         else if (hu->proto->oper_speed)
 407                 speed = hu->proto->oper_speed;
 408         else
 409                 speed = 0;
 410
 411         if (speed) {
 412                 err = bcm_set_baudrate(hu, speed);
 413                 if (!err)
 414                         hci_uart_set_baudrate(hu, speed);
 415         }
 416
 417 finalize:
 418         release_firmware(fw);
 419
 420         err = btbcm_finalize(hu->hdev);
 421         if (err)
 422                 return err;
 423
 424         if (!bcm_request_irq(bcm))
 425                 err = bcm_setup_sleep(hu);
 426
 427         return err;
 428 }
 429
 430 #define BCM_RECV_LM_DIAG \
 431         .type = BCM_LM_DIAG_PKT, \
 432         .hlen = BCM_LM_DIAG_SIZE, \
 433         .loff = 0, \
 434         .lsize = 0, \
 435         .maxlen = BCM_LM_DIAG_SIZE
 436
 437 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 438         { H4_RECV_ACL,      .recv = hci_recv_frame },
 439         { H4_RECV_SCO,      .recv = hci_recv_frame },
 440         { H4_RECV_EVENT,    .recv = hci_recv_frame },
 441         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 442 };
 443
 444 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
 445 {
 446         struct bcm_data *bcm = hu->priv;
 447
 448         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 449                 return -EUNATCH;
 450
 451         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 452                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 453         if (IS_ERR(bcm->rx_skb)) {
 454                 int err = PTR_ERR(bcm->rx_skb);
 455                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 456                 bcm->rx_skb = NULL;
 457                 return err;
 458         } else if (!bcm->rx_skb) {
 459                 /* Delay auto-suspend when receiving completed packet */
 460                 mutex_lock(&bcm_device_lock);
 461                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
 462                         pm_runtime_get(&bcm->dev->pdev->dev);
 463                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
 464                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
 465                 }
 466                 mutex_unlock(&bcm_device_lock);
 467         }
 468
 469         return count;
 470 }
 471
 472 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 473 {
 474         struct bcm_data *bcm = hu->priv;
 475
 476         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
 477
 478         /* Prepend skb with frame type */
 479         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 480         skb_queue_tail(&bcm->txq, skb);
 481
 482         return 0;
 483 }
 484
 485 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 486 {
 487         struct bcm_data *bcm = hu->priv;
 488         struct sk_buff *skb = NULL;
 489         struct bcm_device *bdev = NULL;
 490
 491         mutex_lock(&bcm_device_lock);
 492
 493         if (bcm_device_exists(bcm->dev)) {
 494                 bdev = bcm->dev;
 495                 pm_runtime_get_sync(&bdev->pdev->dev);
 496                 /* Shall be resumed here */
 497         }
 498
 499         skb = skb_dequeue(&bcm->txq);
 500
 501         if (bdev) {
 502                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
 503                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
 504         }
 505
 506         mutex_unlock(&bcm_device_lock);
 507
 508         return skb;
 509 }
 510
 511 #ifdef CONFIG_PM
 512 static int bcm_suspend_device(struct device *dev)
 513 {
 514         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 515
 516         bt_dev_dbg(bdev, "");
 517
 518         if (!bdev->is_suspended && bdev->hu) {
 519                 hci_uart_set_flow_control(bdev->hu, true);
 520
 521                 /* Once this returns, driver suspends BT via GPIO */
 522                 bdev->is_suspended = true;
 523         }
 524
 525         /* Suspend the device */
 526         if (bdev->device_wakeup) {
 527                 gpiod_set_value(bdev->device_wakeup, false);
 528                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
 529                 mdelay(15);
 530         }
 531
 532         return 0;
 533 }
 534
 535 static int bcm_resume_device(struct device *dev)
 536 {
 537         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 538
 539         bt_dev_dbg(bdev, "");
 540
 541         if (bdev->device_wakeup) {
 542                 gpiod_set_value(bdev->device_wakeup, true);
 543                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
 544                 mdelay(15);
 545         }
 546
 547         /* When this executes, the device has woken up already */
 548         if (bdev->is_suspended && bdev->hu) {
 549                 bdev->is_suspended = false;
 550
 551                 hci_uart_set_flow_control(bdev->hu, false);
 552         }
 553
 554         return 0;
 555 }
 556 #endif
 557
 558 #ifdef CONFIG_PM_SLEEP
 559 /* Platform suspend callback */
 560 static int bcm_suspend(struct device *dev)
 561 {
 562         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 563         int error;
 564
 565         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
 566
 567         /* bcm_suspend can be called at any time as long as platform device is
 568          * bound, so it should use bcm_device_lock to protect access to hci_uart
 569          * and device_wake-up GPIO.
 570          */
 571         mutex_lock(&bcm_device_lock);
 572
 573         if (!bdev->hu)
 574                 goto unlock;
 575
 576         if (pm_runtime_active(dev))
 577                 bcm_suspend_device(dev);
 578
 579         if (device_may_wakeup(&bdev->pdev->dev)) {
 580                 error = enable_irq_wake(bdev->irq);
 581                 if (!error)
 582                         bt_dev_dbg(bdev, "BCM irq: enabled");
 583         }
 584
 585 unlock:
 586         mutex_unlock(&bcm_device_lock);
 587
 588         return 0;
 589 }
 590
 591 /* Platform resume callback */
 592 static int bcm_resume(struct device *dev)
 593 {
 594         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 595
 596         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
 597
 598         /* bcm_resume can be called at any time as long as platform device is
 599          * bound, so it should use bcm_device_lock to protect access to hci_uart
 600          * and device_wake-up GPIO.
 601          */
 602         mutex_lock(&bcm_device_lock);
 603
 604         if (!bdev->hu)
 605                 goto unlock;
 606
 607         if (device_may_wakeup(&bdev->pdev->dev)) {
 608                 disable_irq_wake(bdev->irq);
 609                 bt_dev_dbg(bdev, "BCM irq: disabled");
 610         }
 611
 612         bcm_resume_device(dev);
 613
 614 unlock:
 615         mutex_unlock(&bcm_device_lock);
 616
 617         pm_runtime_disable(dev);
 618         pm_runtime_set_active(dev);
 619         pm_runtime_enable(dev);
 620
 621         return 0;
 622 }
 623 #endif
 624
 625 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
 626 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
 627 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
 628
 629 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
 630         { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
 631         { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
 632         { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
 633         { },
 634 };
 635
 636 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
 637 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
 638 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
 639
 640 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
 641         { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
 642         { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
 643         { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
 644         { },
 645 };
 646
 647 #ifdef CONFIG_ACPI
 648 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
 649
 650 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 651 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
 652         {
 653                 .ident = "Asus T100TA",
 654                 .matches = {
 655                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 656                                         "ASUSTeK COMPUTER INC."),
 657                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 658                 },
 659                 .driver_data = &acpi_active_low,
 660         },
 661         {
 662                 .ident = "Asus T100CHI",
 663                 .matches = {
 664                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 665                                         "ASUSTeK COMPUTER INC."),
 666                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
 667                 },
 668                 .driver_data = &acpi_active_low,
 669         },
 670         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
 671                 .ident = "Lenovo ThinkPad 8",
 672                 .matches = {
 673                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 674                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
 675                 },
 676                 .driver_data = &acpi_active_low,
 677         },
 678         { }
 679 };
 680
 681 static int bcm_resource(struct acpi_resource *ares, void *data)
 682 {
 683         struct bcm_device *dev = data;
 684         struct acpi_resource_extended_irq *irq;
 685         struct acpi_resource_gpio *gpio;
 686         struct acpi_resource_uart_serialbus *sb;
 687
 688         switch (ares->type) {
 689         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 690                 irq = &ares->data.extended_irq;
 691                 dev->irq_polarity = irq->polarity;
 692                 break;
 693
 694         case ACPI_RESOURCE_TYPE_GPIO:
 695                 gpio = &ares->data.gpio;
 696                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
 697                         dev->irq_polarity = gpio->polarity;
 698                 break;
 699
 700         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 701                 sb = &ares->data.uart_serial_bus;
 702                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 703                         dev->init_speed = sb->default_baud_rate;
 704                 break;
 705
 706         default:
 707                 break;
 708         }
 709
 710         /* Always tell the ACPI core to skip this resource */
 711         return 1;
 712 }
 713 #endif /* CONFIG_ACPI */
 714
 715 static int bcm_platform_probe(struct bcm_device *dev)
 716 {
 717         struct platform_device *pdev = dev->pdev;
 718
 719         dev->name = dev_name(&pdev->dev);
 720
 721         dev->clk = devm_clk_get(&pdev->dev, NULL);
 722
 723         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 724                                                      "device-wakeup",
 725                                                      GPIOD_OUT_LOW);
 726         if (IS_ERR(dev->device_wakeup))
 727                 return PTR_ERR(dev->device_wakeup);
 728
 729         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 730                                                 GPIOD_OUT_LOW);
 731         if (IS_ERR(dev->shutdown))
 732                 return PTR_ERR(dev->shutdown);
 733
 734         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
 735         dev->irq = platform_get_irq(pdev, 0);
 736         if (dev->irq <= 0) {
 737                 struct gpio_desc *gpio;
 738
 739                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
 740                                                GPIOD_IN);
 741                 if (IS_ERR(gpio))
 742                         return PTR_ERR(gpio);
 743
 744                 dev->irq = gpiod_to_irq(gpio);
 745         }
 746
 747         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
 748
 749         /* Make sure at-least one of the GPIO is defined and that
 750          * a name is specified for this instance
 751          */
 752         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 753                 dev_err(&pdev->dev, "invalid platform data\n");
 754                 return -EINVAL;
 755         }
 756
 757         return 0;
 758 }
 759
 760 #ifdef CONFIG_ACPI
 761 static int bcm_acpi_probe(struct bcm_device *dev)
 762 {
 763         struct platform_device *pdev = dev->pdev;
 764         LIST_HEAD(resources);
 765         const struct dmi_system_id *dmi_id;
 766         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
 767         const struct acpi_device_id *id;
 768         int ret;
 769
 770         /* Retrieve GPIO data */
 771         id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
 772         if (id)
 773                 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
 774
 775         ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping);
 776         if (ret)
 777                 return ret;
 778
 779         ret = bcm_platform_probe(dev);
 780         if (ret)
 781                 return ret;
 782
 783         /* Retrieve UART ACPI info */
 784         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
 785                                      &resources, bcm_resource, dev);
 786         if (ret < 0)
 787                 return ret;
 788         acpi_dev_free_resource_list(&resources);
 789
 790         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
 791         if (dmi_id) {
 792                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
 793                             dmi_id->ident);
 794                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
 795         }
 796
 797         return 0;
 798 }
 799 #else
 800 static int bcm_acpi_probe(struct bcm_device *dev)
 801 {
 802         return -EINVAL;
 803 }
 804 #endif /* CONFIG_ACPI */
 805
 806 static int bcm_probe(struct platform_device *pdev)
 807 {
 808         struct bcm_device *dev;
 809         int ret;
 810
 811         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 812         if (!dev)
 813                 return -ENOMEM;
 814
 815         dev->pdev = pdev;
 816
 817         if (has_acpi_companion(&pdev->dev))
 818                 ret = bcm_acpi_probe(dev);
 819         else
 820                 ret = bcm_platform_probe(dev);
 821         if (ret)
 822                 return ret;
 823
 824         platform_set_drvdata(pdev, dev);
 825
 826         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
 827
 828         /* Place this instance on the device list */
 829         mutex_lock(&bcm_device_lock);
 830         list_add_tail(&dev->list, &bcm_device_list);
 831         mutex_unlock(&bcm_device_lock);
 832
 833         bcm_gpio_set_power(dev, false);
 834
 835         return 0;
 836 }
 837
 838 static int bcm_remove(struct platform_device *pdev)
 839 {
 840         struct bcm_device *dev = platform_get_drvdata(pdev);
 841
 842         mutex_lock(&bcm_device_lock);
 843         list_del(&dev->list);
 844         mutex_unlock(&bcm_device_lock);
 845
 846         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
 847
 848         return 0;
 849 }
 850
 851 static const struct hci_uart_proto bcm_proto = {
 852         .id             = HCI_UART_BCM,
 853         .name           = "Broadcom",
 854         .manufacturer   = 15,
 855         .init_speed     = 115200,
 856         .oper_speed     = 4000000,
 857         .open           = bcm_open,
 858         .close          = bcm_close,
 859         .flush          = bcm_flush,
 860         .setup          = bcm_setup,
 861         .set_baudrate   = bcm_set_baudrate,
 862         .recv           = bcm_recv,
 863         .enqueue        = bcm_enqueue,
 864         .dequeue        = bcm_dequeue,
 865 };
 866
 867 #ifdef CONFIG_ACPI
 868 static const struct acpi_device_id bcm_acpi_match[] = {
 869         { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 870         { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 871         { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 872         { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 873         { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 874         { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 875         { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 876         { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 877         { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 878         { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 879         { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 880         { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 881         { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 882         { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 883         { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 884         { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 885         { },
 886 };
 887 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 888 #endif
 889
 890 /* Platform suspend and resume callbacks */
 891 static const struct dev_pm_ops bcm_pm_ops = {
 892         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
 893         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
 894 };
 895
 896 static struct platform_driver bcm_driver = {
 897         .probe = bcm_probe,
 898         .remove = bcm_remove,
 899         .driver = {
 900                 .name = "hci_bcm",
 901                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
 902                 .pm = &bcm_pm_ops,
 903         },
 904 };
 905
 906 int __init bcm_init(void)
 907 {
 908         platform_driver_register(&bcm_driver);
 909
 910         return hci_uart_register_proto(&bcm_proto);
 911 }
 912
 913 int __exit bcm_deinit(void)
 914 {
 915         platform_driver_unregister(&bcm_driver);
 916
 917         return hci_uart_unregister_proto(&bcm_proto);
 918 }