linux/drivers/bluetooth/hci_bcm.c
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   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
  49struct 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
  71struct 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 */
  79static DEFINE_MUTEX(bcm_device_lock);
  80static LIST_HEAD(bcm_device_list);
  81
  82static 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 */
 132static 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
 146static 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
 163static 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
 176static 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
 204unlock:
 205        mutex_unlock(&bcm_device_lock);
 206
 207        return err;
 208}
 209
 210static 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
 226static 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
 248static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
 249static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
 250#endif
 251
 252static 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
 275static 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
 314static 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
 347static 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
 358static 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
 412finalize:
 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
 433static 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
 440static 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
 468static 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
 481static 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
 508static 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
 531static 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 */
 556static 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
 581unlock:
 582        mutex_unlock(&bcm_device_lock);
 583
 584        return 0;
 585}
 586
 587/* Platform resume callback */
 588static 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
 610unlock:
 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
 621static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
 622static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
 623static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false };
 624
 625static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = {
 626        { "device-wakeup-gpios", &device_wakeup_gpios, 1 },
 627        { "shutdown-gpios", &shutdown_gpios, 1 },
 628        { "host-wakeup-gpios", &host_wakeup_gpios, 1 },
 629        { },
 630};
 631
 632#ifdef CONFIG_ACPI
 633static u8 acpi_active_low = ACPI_ACTIVE_LOW;
 634
 635/* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 636static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = {
 637        {
 638                .ident = "Asus T100TA",
 639                .matches = {
 640                        DMI_EXACT_MATCH(DMI_SYS_VENDOR,
 641                                        "ASUSTeK COMPUTER INC."),
 642                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
 643                },
 644                .driver_data = &acpi_active_low,
 645        },
 646        {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
 647                .ident = "Lenovo ThinkPad 8",
 648                .matches = {
 649                        DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 650                        DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"),
 651                },
 652                .driver_data = &acpi_active_low,
 653        },
 654        { }
 655};
 656
 657static int bcm_resource(struct acpi_resource *ares, void *data)
 658{
 659        struct bcm_device *dev = data;
 660        struct acpi_resource_extended_irq *irq;
 661        struct acpi_resource_gpio *gpio;
 662        struct acpi_resource_uart_serialbus *sb;
 663
 664        switch (ares->type) {
 665        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 666                irq = &ares->data.extended_irq;
 667                dev->irq_polarity = irq->polarity;
 668                break;
 669
 670        case ACPI_RESOURCE_TYPE_GPIO:
 671                gpio = &ares->data.gpio;
 672                if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
 673                        dev->irq_polarity = gpio->polarity;
 674                break;
 675
 676        case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 677                sb = &ares->data.uart_serial_bus;
 678                if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART)
 679                        dev->init_speed = sb->default_baud_rate;
 680                break;
 681
 682        default:
 683                break;
 684        }
 685
 686        /* Always tell the ACPI core to skip this resource */
 687        return 1;
 688}
 689
 690static int bcm_acpi_probe(struct bcm_device *dev)
 691{
 692        struct platform_device *pdev = dev->pdev;
 693        LIST_HEAD(resources);
 694        const struct dmi_system_id *dmi_id;
 695        int ret;
 696
 697        /* Retrieve GPIO data */
 698        dev->name = dev_name(&pdev->dev);
 699        ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
 700                                        acpi_bcm_default_gpios);
 701        if (ret)
 702                return ret;
 703
 704        dev->clk = devm_clk_get(&pdev->dev, NULL);
 705
 706        dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev,
 707                                                     "device-wakeup",
 708                                                     GPIOD_OUT_LOW);
 709        if (IS_ERR(dev->device_wakeup))
 710                return PTR_ERR(dev->device_wakeup);
 711
 712        dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown",
 713                                                GPIOD_OUT_LOW);
 714        if (IS_ERR(dev->shutdown))
 715                return PTR_ERR(dev->shutdown);
 716
 717        /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
 718        dev->irq = platform_get_irq(pdev, 0);
 719        if (dev->irq <= 0) {
 720                struct gpio_desc *gpio;
 721
 722                gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup",
 723                                               GPIOD_IN);
 724                if (IS_ERR(gpio))
 725                        return PTR_ERR(gpio);
 726
 727                dev->irq = gpiod_to_irq(gpio);
 728        }
 729
 730        dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq);
 731
 732        /* Make sure at-least one of the GPIO is defined and that
 733         * a name is specified for this instance
 734         */
 735        if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) {
 736                dev_err(&pdev->dev, "invalid platform data\n");
 737                return -EINVAL;
 738        }
 739
 740        /* Retrieve UART ACPI info */
 741        ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev),
 742                                     &resources, bcm_resource, dev);
 743        if (ret < 0)
 744                return ret;
 745        acpi_dev_free_resource_list(&resources);
 746
 747        dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table);
 748        if (dmi_id) {
 749                bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low",
 750                            dmi_id->ident);
 751                dev->irq_polarity = *(u8 *)dmi_id->driver_data;
 752        }
 753
 754        return 0;
 755}
 756#else
 757static int bcm_acpi_probe(struct bcm_device *dev)
 758{
 759        return -EINVAL;
 760}
 761#endif /* CONFIG_ACPI */
 762
 763static int bcm_probe(struct platform_device *pdev)
 764{
 765        struct bcm_device *dev;
 766        int ret;
 767
 768        dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 769        if (!dev)
 770                return -ENOMEM;
 771
 772        dev->pdev = pdev;
 773
 774        ret = bcm_acpi_probe(dev);
 775        if (ret)
 776                return ret;
 777
 778        platform_set_drvdata(pdev, dev);
 779
 780        dev_info(&pdev->dev, "%s device registered.\n", dev->name);
 781
 782        /* Place this instance on the device list */
 783        mutex_lock(&bcm_device_lock);
 784        list_add_tail(&dev->list, &bcm_device_list);
 785        mutex_unlock(&bcm_device_lock);
 786
 787        bcm_gpio_set_power(dev, false);
 788
 789        return 0;
 790}
 791
 792static int bcm_remove(struct platform_device *pdev)
 793{
 794        struct bcm_device *dev = platform_get_drvdata(pdev);
 795
 796        mutex_lock(&bcm_device_lock);
 797        list_del(&dev->list);
 798        mutex_unlock(&bcm_device_lock);
 799
 800        acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
 801
 802        dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
 803
 804        return 0;
 805}
 806
 807static const struct hci_uart_proto bcm_proto = {
 808        .id             = HCI_UART_BCM,
 809        .name           = "Broadcom",
 810        .manufacturer   = 15,
 811        .init_speed     = 115200,
 812        .oper_speed     = 4000000,
 813        .open           = bcm_open,
 814        .close          = bcm_close,
 815        .flush          = bcm_flush,
 816        .setup          = bcm_setup,
 817        .set_baudrate   = bcm_set_baudrate,
 818        .recv           = bcm_recv,
 819        .enqueue        = bcm_enqueue,
 820        .dequeue        = bcm_dequeue,
 821};
 822
 823#ifdef CONFIG_ACPI
 824static const struct acpi_device_id bcm_acpi_match[] = {
 825        { "BCM2E1A", 0 },
 826        { "BCM2E39", 0 },
 827        { "BCM2E3A", 0 },
 828        { "BCM2E3D", 0 },
 829        { "BCM2E3F", 0 },
 830        { "BCM2E40", 0 },
 831        { "BCM2E54", 0 },
 832        { "BCM2E55", 0 },
 833        { "BCM2E64", 0 },
 834        { "BCM2E65", 0 },
 835        { "BCM2E67", 0 },
 836        { "BCM2E71", 0 },
 837        { "BCM2E7B", 0 },
 838        { "BCM2E7C", 0 },
 839        { },
 840};
 841MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
 842#endif
 843
 844/* Platform suspend and resume callbacks */
 845static const struct dev_pm_ops bcm_pm_ops = {
 846        SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
 847        SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
 848};
 849
 850static struct platform_driver bcm_driver = {
 851        .probe = bcm_probe,
 852        .remove = bcm_remove,
 853        .driver = {
 854                .name = "hci_bcm",
 855                .acpi_match_table = ACPI_PTR(bcm_acpi_match),
 856                .pm = &bcm_pm_ops,
 857        },
 858};
 859
 860int __init bcm_init(void)
 861{
 862        platform_driver_register(&bcm_driver);
 863
 864        return hci_uart_register_proto(&bcm_proto);
 865}
 866
 867int __exit bcm_deinit(void)
 868{
 869        platform_driver_unregister(&bcm_driver);
 870
 871        return hci_uart_unregister_proto(&bcm_proto);
 872}
 873