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 = 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_u8(skb, BCM_LM_DIAG_PKT);
 266         skb_put_u8(skb, 0xf0);
 267         skb_put_u8(skb, 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         if (!hu->tty->dev)
 291                 goto out;
 292
 293         mutex_lock(&bcm_device_lock);
 294         list_for_each(p, &bcm_device_list) {
 295                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 296
 297                 /* Retrieve saved bcm_device based on parent of the
 298                  * platform device (saved during device probe) and
 299                  * parent of tty device used by hci_uart
 300                  */
 301                 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
 302                         bcm->dev = dev;
 303                         hu->init_speed = dev->init_speed;
 304 #ifdef CONFIG_PM
 305                         dev->hu = hu;
 306 #endif
 307                         bcm_gpio_set_power(bcm->dev, true);
 308                         break;
 309                 }
 310         }
 311
 312         mutex_unlock(&bcm_device_lock);
 313 out:
 314         return 0;
 315 }
 316
 317 static int bcm_close(struct hci_uart *hu)
 318 {
 319         struct bcm_data *bcm = hu->priv;
 320         struct bcm_device *bdev = bcm->dev;
 321
 322         bt_dev_dbg(hu->hdev, "hu %p", hu);
 323
 324         /* Protect bcm->dev against removal of the device or driver */
 325         mutex_lock(&bcm_device_lock);
 326         if (bcm_device_exists(bdev)) {
 327                 bcm_gpio_set_power(bdev, false);
 328 #ifdef CONFIG_PM
 329                 pm_runtime_disable(&bdev->pdev->dev);
 330                 pm_runtime_set_suspended(&bdev->pdev->dev);
 331
 332                 if (device_can_wakeup(&bdev->pdev->dev)) {
 333                         devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev);
 334                         device_init_wakeup(&bdev->pdev->dev, false);
 335                 }
 336
 337                 bdev->hu = NULL;
 338 #endif
 339         }
 340         mutex_unlock(&bcm_device_lock);
 341
 342         skb_queue_purge(&bcm->txq);
 343         kfree_skb(bcm->rx_skb);
 344         kfree(bcm);
 345
 346         hu->priv = NULL;
 347         return 0;
 348 }
 349
 350 static int bcm_flush(struct hci_uart *hu)
 351 {
 352         struct bcm_data *bcm = hu->priv;
 353
 354         bt_dev_dbg(hu->hdev, "hu %p", hu);
 355
 356         skb_queue_purge(&bcm->txq);
 357
 358         return 0;
 359 }
 360
 361 static int bcm_setup(struct hci_uart *hu)
 362 {
 363         struct bcm_data *bcm = hu->priv;
 364         char fw_name[64];
 365         const struct firmware *fw;
 366         unsigned int speed;
 367         int err;
 368
 369         bt_dev_dbg(hu->hdev, "hu %p", hu);
 370
 371         hu->hdev->set_diag = bcm_set_diag;
 372         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 373
 374         err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name));
 375         if (err)
 376                 return err;
 377
 378         err = request_firmware(&fw, fw_name, &hu->hdev->dev);
 379         if (err < 0) {
 380                 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
 381                 return 0;
 382         }
 383
 384         err = btbcm_patchram(hu->hdev, fw);
 385         if (err) {
 386                 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
 387                 goto finalize;
 388         }
 389
 390         /* Init speed if any */
 391         if (hu->init_speed)
 392                 speed = hu->init_speed;
 393         else if (hu->proto->init_speed)
 394                 speed = hu->proto->init_speed;
 395         else
 396                 speed = 0;
 397
 398         if (speed)
 399                 hci_uart_set_baudrate(hu, speed);
 400
 401         /* Operational speed if any */
 402         if (hu->oper_speed)
 403                 speed = hu->oper_speed;
 404         else if (hu->proto->oper_speed)
 405                 speed = hu->proto->oper_speed;
 406         else
 407                 speed = 0;
 408
 409         if (speed) {
 410                 err = bcm_set_baudrate(hu, speed);
 411                 if (!err)
 412                         hci_uart_set_baudrate(hu, speed);
 413         }
 414
 415 finalize:
 416         release_firmware(fw);
 417
 418         err = btbcm_finalize(hu->hdev);
 419         if (err)
 420                 return err;
 421
 422         if (!bcm_request_irq(bcm))
 423                 err = bcm_setup_sleep(hu);
 424
 425         return err;
 426 }
 427
 428 #define BCM_RECV_LM_DIAG \
 429         .type = BCM_LM_DIAG_PKT, \
 430         .hlen = BCM_LM_DIAG_SIZE, \
 431         .loff = 0, \
 432         .lsize = 0, \
 433         .maxlen = BCM_LM_DIAG_SIZE
 434
 435 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 436         { H4_RECV_ACL,      .recv = hci_recv_frame },
 437         { H4_RECV_SCO,      .recv = hci_recv_frame },
 438         { H4_RECV_EVENT,    .recv = hci_recv_frame },
 439         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 440 };
 441
 442 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
 443 {
 444         struct bcm_data *bcm = hu->priv;
 445
 446         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 447                 return -EUNATCH;
 448
 449         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 450                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 451         if (IS_ERR(bcm->rx_skb)) {
 452                 int err = PTR_ERR(bcm->rx_skb);
 453                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 454                 bcm->rx_skb = NULL;
 455                 return err;
 456         } else if (!bcm->rx_skb) {
 457                 /* Delay auto-suspend when receiving completed packet */
 458                 mutex_lock(&bcm_device_lock);
 459                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
 460                         pm_runtime_get(&bcm->dev->pdev->dev);
 461                         pm_runtime_mark_last_busy(&bcm->dev->pdev->dev);
 462                         pm_runtime_put_autosuspend(&bcm->dev->pdev->dev);
 463                 }
 464                 mutex_unlock(&bcm_device_lock);
 465         }
 466
 467         return count;
 468 }
 469
 470 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 471 {
 472         struct bcm_data *bcm = hu->priv;
 473
 474         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
 475
 476         /* Prepend skb with frame type */
 477         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 478         skb_queue_tail(&bcm->txq, skb);
 479
 480         return 0;
 481 }
 482
 483 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 484 {
 485         struct bcm_data *bcm = hu->priv;
 486         struct sk_buff *skb = NULL;
 487         struct bcm_device *bdev = NULL;
 488
 489         mutex_lock(&bcm_device_lock);
 490
 491         if (bcm_device_exists(bcm->dev)) {
 492                 bdev = bcm->dev;
 493                 pm_runtime_get_sync(&bdev->pdev->dev);
 494                 /* Shall be resumed here */
 495         }
 496
 497         skb = skb_dequeue(&bcm->txq);
 498
 499         if (bdev) {
 500                 pm_runtime_mark_last_busy(&bdev->pdev->dev);
 501                 pm_runtime_put_autosuspend(&bdev->pdev->dev);
 502         }
 503
 504         mutex_unlock(&bcm_device_lock);
 505
 506         return skb;
 507 }
 508
 509 #ifdef CONFIG_PM
 510 static int bcm_suspend_device(struct device *dev)
 511 {
 512         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 513
 514         bt_dev_dbg(bdev, "");
 515
 516         if (!bdev->is_suspended && bdev->hu) {
 517                 hci_uart_set_flow_control(bdev->hu, true);
 518
 519                 /* Once this returns, driver suspends BT via GPIO */
 520                 bdev->is_suspended = true;
 521         }
 522
 523         /* Suspend the device */
 524         if (bdev->device_wakeup) {
 525                 gpiod_set_value(bdev->device_wakeup, false);
 526                 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
 527                 mdelay(15);
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int bcm_resume_device(struct device *dev)
 534 {
 535         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 536
 537         bt_dev_dbg(bdev, "");
 538
 539         if (bdev->device_wakeup) {
 540                 gpiod_set_value(bdev->device_wakeup, true);
 541                 bt_dev_dbg(bdev, "resume, delaying 15 ms");
 542                 mdelay(15);
 543         }
 544
 545         /* When this executes, the device has woken up already */
 546         if (bdev->is_suspended && bdev->hu) {
 547                 bdev->is_suspended = false;
 548
 549                 hci_uart_set_flow_control(bdev->hu, false);
 550         }
 551
 552         return 0;
 553 }
 554 #endif
 555
 556 #ifdef CONFIG_PM_SLEEP
 557 /* Platform suspend callback */
 558 static int bcm_suspend(struct device *dev)
 559 {
 560         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 561         int error;
 562
 563         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
 564
 565         /* bcm_suspend can be called at any time as long as platform device is
 566          * bound, so it should use bcm_device_lock to protect access to hci_uart
 567          * and device_wake-up GPIO.
 568          */
 569         mutex_lock(&bcm_device_lock);
 570
 571         if (!bdev->hu)
 572                 goto unlock;
 573
 574         if (pm_runtime_active(dev))
 575                 bcm_suspend_device(dev);
 576
 577         if (device_may_wakeup(&bdev->pdev->dev)) {
 578                 error = enable_irq_wake(bdev->irq);
 579                 if (!error)
 580                         bt_dev_dbg(bdev, "BCM irq: enabled");
 581         }
 582
 583 unlock:
 584         mutex_unlock(&bcm_device_lock);
 585
 586         return 0;
 587 }
 588
 589 /* Platform resume callback */
 590 static int bcm_resume(struct device *dev)
 591 {
 592         struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
 593
 594         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
 595
 596         /* bcm_resume can be called at any time as long as platform device is
 597          * bound, so it should use bcm_device_lock to protect access to hci_uart
 598          * and device_wake-up GPIO.
 599          */
 600         mutex_lock(&bcm_device_lock);
 601
 602         if (!bdev->hu)
 603                 goto unlock;
 604
 605         if (device_may_wakeup(&bdev->pdev->dev)) {
 606                 disable_irq_wake(bdev->irq);
 607                 bt_dev_dbg(bdev, "BCM irq: disabled");
 608         }
 609
 610         bcm_resume_device(dev);
 611
 612 unlock:
 613         mutex_unlock(&bcm_device_lock);
 614
 615         pm_runtime_disable(dev);
 616         pm_runtime_set_active(dev);
 617         pm_runtime_enable(dev);
 618
 619         return 0;
 620 }
 621 #endif
 622
 623 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false };
 624 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false };
 625 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false };
 626
 627 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
 628         { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 },
 629         { "shutdown-gpios", &int_last_shutdown_gpios, 1 },
 630         { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 },
 631         { },
 632 };
 633
 634 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false };
 635 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false };
 636 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false };
 637
 638 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
 639         { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 },
 640         { "shutdown-gpios", &int_first_shutdown_gpios, 1 },
 641         { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 },
 642         { },
 643 };
 644
 645 #ifdef CONFIG_ACPI
 646 static u8 acpi_active_low = ACPI_ACTIVE_LOW;
 647
 648 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 649 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
 650         {
 651                 .ident = "Asus T100TA",
 652                 .matches = {
 653                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 654                                         "ASUSTeK COMPUTER INC."),
 655                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 656                 },
 657                 .driver_data = &acpi_active_low,
 658         },
 659         {
 660                 .ident = "Asus T100CHI",
 661                 .matches = {
 662                         DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 663                                         "ASUSTeK COMPUTER INC."),
 664                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
 665                 },
 666                 .driver_data = &acpi_active_low,
 667         },
 668         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
 669                 .ident = "Lenovo ThinkPad 8",
 670                 .matches = {
 671                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 672                         DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
 673                 },
 674                 .driver_data = &acpi_active_low,
 675         },
 676         { }
 677 };
 678
 679 static int bcm_resource(struct acpi_resource *ares, void *data)
 680 {
 681         struct bcm_device *dev = data;
 682         struct acpi_resource_extended_irq *irq;
 683         struct acpi_resource_gpio *gpio;
 684         struct acpi_resource_uart_serialbus *sb;
 685
 686         switch (ares->type) {
 687         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 688                 irq = &ares->data.extended_irq;
 689                 dev->irq_polarity = irq->polarity;
 690                 break;
 691
 692         case ACPI_RESOURCE_TYPE_GPIO:
 693                 gpio = &ares->data.gpio;
 694                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
 695                         dev->irq_polarity = gpio->polarity;
 696                 break;
 697
 698         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 699                 sb = &ares->data.uart_serial_bus;
 700                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 701                         dev->init_speed = sb->default_baud_rate;
 702                 break;
 703
 704         default:
 705                 break;
 706         }
 707
 708         /* Always tell the ACPI core to skip this resource */
 709         return 1;
 710 }
 711 #endif /* CONFIG_ACPI */
 712
 713 static int bcm_platform_probe(struct bcm_device *dev)
 714 {
 715         struct platform_device *pdev = dev->pdev;
 716
 717         dev->name = dev_name(&pdev->dev);
 718
 719         dev->clk = devm_clk_get(&pdev->dev, NULL);
 720
 721         dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 722                                                      "device-wakeup",
 723                                                      GPIOD_OUT_LOW);
 724         if (IS_ERR(dev->device_wakeup))
 725                 return PTR_ERR(dev->device_wakeup);
 726
 727         dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 728                                                 GPIOD_OUT_LOW);
 729         if (IS_ERR(dev->shutdown))
 730                 return PTR_ERR(dev->shutdown);
 731
 732         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
 733         dev->irq = platform_get_irq(pdev, 0);
 734         if (dev->irq <= 0) {
 735                 struct gpio_desc *gpio;
 736
 737                 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
 738                                                GPIOD_IN);
 739                 if (IS_ERR(gpio))
 740                         return PTR_ERR(gpio);
 741
 742                 dev->irq = gpiod_to_irq(gpio);
 743         }
 744
 745         dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
 746
 747         /* Make sure at-least one of the GPIO is defined and that
 748          * a name is specified for this instance
 749          */
 750         if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 751                 dev_err(&pdev->dev, "invalid platform data\n");
 752                 return -EINVAL;
 753         }
 754
 755         return 0;
 756 }
 757
 758 #ifdef CONFIG_ACPI
 759 static int bcm_acpi_probe(struct bcm_device *dev)
 760 {
 761         struct platform_device *pdev = dev->pdev;
 762         LIST_HEAD(resources);
 763         const struct dmi_system_id *dmi_id;
 764         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
 765         const struct acpi_device_id *id;
 766         int ret;
 767
 768         /* Retrieve GPIO data */
 769         id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
 770         if (id)
 771                 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data;
 772
 773         ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping);
 774         if (ret)
 775                 return ret;
 776
 777         ret = bcm_platform_probe(dev);
 778         if (ret)
 779                 return ret;
 780
 781         /* Retrieve UART ACPI info */
 782         ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
 783                                      &resources, bcm_resource, dev);
 784         if (ret < 0)
 785                 return ret;
 786         acpi_dev_free_resource_list(&resources);
 787
 788         dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
 789         if (dmi_id) {
 790                 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
 791                             dmi_id->ident);
 792                 dev->irq_polarity = *(u8 *)dmi_id->driver_data;
 793         }
 794
 795         return 0;
 796 }
 797 #else
 798 static int bcm_acpi_probe(struct bcm_device *dev)
 799 {
 800         return -EINVAL;
 801 }
 802 #endif /* CONFIG_ACPI */
 803
 804 static int bcm_probe(struct platform_device *pdev)
 805 {
 806         struct bcm_device *dev;
 807         int ret;
 808
 809         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 810         if (!dev)
 811                 return -ENOMEM;
 812
 813         dev->pdev = pdev;
 814
 815         if (has_acpi_companion(&pdev->dev))
 816                 ret = bcm_acpi_probe(dev);
 817         else
 818                 ret = bcm_platform_probe(dev);
 819         if (ret)
 820                 return ret;
 821
 822         platform_set_drvdata(pdev, dev);
 823
 824         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
 825
 826         /* Place this instance on the device list */
 827         mutex_lock(&bcm_device_lock);
 828         list_add_tail(&dev->list, &bcm_device_list);
 829         mutex_unlock(&bcm_device_lock);
 830
 831         bcm_gpio_set_power(dev, false);
 832
 833         return 0;
 834 }
 835
 836 static int bcm_remove(struct platform_device *pdev)
 837 {
 838         struct bcm_device *dev = platform_get_drvdata(pdev);
 839
 840         mutex_lock(&bcm_device_lock);
 841         list_del(&dev->list);
 842         mutex_unlock(&bcm_device_lock);
 843
 844         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
 845
 846         return 0;
 847 }
 848
 849 static const struct hci_uart_proto bcm_proto = {
 850         .id             = HCI_UART_BCM,
 851         .name           = "Broadcom",
 852         .manufacturer   = 15,
 853         .init_speed     = 115200,
 854         .oper_speed     = 4000000,
 855         .open           = bcm_open,
 856         .close          = bcm_close,
 857         .flush          = bcm_flush,
 858         .setup          = bcm_setup,
 859         .set_baudrate   = bcm_set_baudrate,
 860         .recv           = bcm_recv,
 861         .enqueue        = bcm_enqueue,
 862         .dequeue        = bcm_dequeue,
 863 };
 864
 865 #ifdef CONFIG_ACPI
 866 static const struct acpi_device_id bcm_acpi_match[] = {
 867         { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 868         { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 869         { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 870         { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 871         { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 872         { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 873         { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 874         { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 875         { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 876         { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 877         { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 878         { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 879         { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 880         { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios },
 881         { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 882         { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios },
 883         { },
 884 };
 885 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 886 #endif
 887
 888 /* Platform suspend and resume callbacks */
 889 static const struct dev_pm_ops bcm_pm_ops = {
 890         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
 891         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
 892 };
 893
 894 static struct platform_driver bcm_driver = {
 895         .probe = bcm_probe,
 896         .remove = bcm_remove,
 897         .driver = {
 898                 .name = "hci_bcm",
 899                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
 900                 .pm = &bcm_pm_ops,
 901         },
 902 };
 903
 904 int __init bcm_init(void)
 905 {
 906         platform_driver_register(&bcm_driver);
 907
 908         return hci_uart_register_proto(&bcm_proto);
 909 }
 910
 911 int __exit bcm_deinit(void)
 912 {
 913         platform_driver_unregister(&bcm_driver);
 914
 915         return hci_uart_unregister_proto(&bcm_proto);
 916 }