drivers/bluetooth/hci_bcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  *  Bluetooth HCI UART driver for Broadcom devices
   5  *
   6  *  Copyright (C) 2015  Intel Corporation
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/errno.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/firmware.h>
  13 #include <linux/module.h>
  14 #include <linux/acpi.h>
  15 #include <linux/of.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/property.h>
  18 #include <linux/platform_data/x86/apple.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/clk.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/gpio/machine.h>
  24 #include <linux/tty.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/dmi.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/serdev.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32
  33 #include "btbcm.h"
  34 #include "hci_uart.h"
  35
  36 #define BCM_NULL_PKT 0x00
  37 #define BCM_NULL_SIZE 0
  38
  39 #define BCM_LM_DIAG_PKT 0x07
  40 #define BCM_LM_DIAG_SIZE 63
  41
  42 #define BCM_TYPE49_PKT 0x31
  43 #define BCM_TYPE49_SIZE 0
  44
  45 #define BCM_TYPE52_PKT 0x34
  46 #define BCM_TYPE52_SIZE 0
  47
  48 #define BCM_AUTOSUSPEND_DELAY   5000 /* default autosleep delay */
  49
  50 #define BCM_NUM_SUPPLIES 2
  51
  52 /**
  53  * struct bcm_device_data - device specific data
  54  * @no_early_set_baudrate: Disallow set baudrate before driver setup()
  55  * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
  56  * @max_autobaud_speed: max baudrate supported by device in autobaud mode
  57  */
  58 struct bcm_device_data {
  59         bool    no_early_set_baudrate;
  60         bool    drive_rts_on_open;
  61         u32     max_autobaud_speed;
  62 };
  63
  64 /**
  65  * struct bcm_device - device driver resources
  66  * @serdev_hu: HCI UART controller struct
  67  * @list: bcm_device_list node
  68  * @dev: physical UART slave
  69  * @name: device name logged by bt_dev_*() functions
  70  * @device_wakeup: BT_WAKE pin,
  71  *      assert = Bluetooth device must wake up or remain awake,
  72  *      deassert = Bluetooth device may sleep when sleep criteria are met
  73  * @shutdown: BT_REG_ON pin,
  74  *      power up or power down Bluetooth device internal regulators
  75  * @reset: BT_RST_N pin,
  76  *      active low resets the Bluetooth logic core
  77  * @set_device_wakeup: callback to toggle BT_WAKE pin
  78  *      either by accessing @device_wakeup or by calling @btlp
  79  * @set_shutdown: callback to toggle BT_REG_ON pin
  80  *      either by accessing @shutdown or by calling @btpu/@btpd
  81  * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
  82  * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
  83  * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
  84  * @gpio_count: internal counter for GPIO resources associated with ACPI device
  85  * @gpio_int_idx: index in _CRS for GpioInt() resource
  86  * @txco_clk: external reference frequency clock used by Bluetooth device
  87  * @lpo_clk: external LPO clock used by Bluetooth device
  88  * @supplies: VBAT and VDDIO supplies used by Bluetooth device
  89  * @res_enabled: whether clocks and supplies are prepared and enabled
  90  * @init_speed: default baudrate of Bluetooth device;
  91  *      the host UART is initially set to this baudrate so that
  92  *      it can configure the Bluetooth device for @oper_speed
  93  * @oper_speed: preferred baudrate of Bluetooth device;
  94  *      set to 0 if @init_speed is already the preferred baudrate
  95  * @irq: interrupt triggered by HOST_WAKE_BT pin
  96  * @irq_active_low: whether @irq is active low
  97  * @irq_acquired: flag to show if IRQ handler has been assigned
  98  * @hu: pointer to HCI UART controller struct,
  99  *      used to disable flow control during runtime suspend and system sleep
 100  * @is_suspended: whether flow control is currently disabled
 101  * @no_early_set_baudrate: don't set_baudrate before setup()
 102  * @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
 103  * @pcm_int_params: keep the initial PCM configuration
 104  * @use_autobaud_mode: start Bluetooth device in autobaud mode
 105  * @max_autobaud_speed: max baudrate supported by device in autobaud mode
 106  */
 107 struct bcm_device {
 108         /* Must be the first member, hci_serdev.c expects this. */
 109         struct hci_uart         serdev_hu;
 110         struct list_head        list;
 111
 112         struct device           *dev;
 113
 114         const char              *name;
 115         struct gpio_desc        *device_wakeup;
 116         struct gpio_desc        *shutdown;
 117         struct gpio_desc        *reset;
 118         int                     (*set_device_wakeup)(struct bcm_device *, bool);
 119         int                     (*set_shutdown)(struct bcm_device *, bool);
 120 #ifdef CONFIG_ACPI
 121         acpi_handle             btlp, btpu, btpd;
 122         int                     gpio_count;
 123         int                     gpio_int_idx;
 124 #endif
 125
 126         struct clk              *txco_clk;
 127         struct clk              *lpo_clk;
 128         struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
 129         bool                    res_enabled;
 130
 131         u32                     init_speed;
 132         u32                     oper_speed;
 133         int                     irq;
 134         bool                    irq_active_low;
 135         bool                    irq_acquired;
 136
 137 #ifdef CONFIG_PM
 138         struct hci_uart         *hu;
 139         bool                    is_suspended;
 140 #endif
 141         bool                    no_early_set_baudrate;
 142         bool                    drive_rts_on_open;
 143         bool                    use_autobaud_mode;
 144         u8                      pcm_int_params[5];
 145         u32                     max_autobaud_speed;
 146 };
 147
 148 /* generic bcm uart resources */
 149 struct bcm_data {
 150         struct sk_buff          *rx_skb;
 151         struct sk_buff_head     txq;
 152
 153         struct bcm_device       *dev;
 154 };
 155
 156 /* List of BCM BT UART devices */
 157 static DEFINE_MUTEX(bcm_device_lock);
 158 static LIST_HEAD(bcm_device_list);
 159
 160 static int irq_polarity = -1;
 161 module_param(irq_polarity, int, 0444);
 162 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
 163
 164 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
 165 {
 166         if (hu->serdev)
 167                 serdev_device_set_baudrate(hu->serdev, speed);
 168         else
 169                 hci_uart_set_baudrate(hu, speed);
 170 }
 171
 172 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
 173 {
 174         struct hci_dev *hdev = hu->hdev;
 175         struct sk_buff *skb;
 176         struct bcm_update_uart_baud_rate param;
 177
 178         if (speed > 3000000) {
 179                 struct bcm_write_uart_clock_setting clock;
 180
 181                 clock.type = BCM_UART_CLOCK_48MHZ;
 182
 183                 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
 184
 185                 /* This Broadcom specific command changes the UART's controller
 186                  * clock for baud rate > 3000000.
 187                  */
 188                 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
 189                 if (IS_ERR(skb)) {
 190                         int err = PTR_ERR(skb);
 191                         bt_dev_err(hdev, "BCM: failed to write clock (%d)",
 192                                    err);
 193                         return err;
 194                 }
 195
 196                 kfree_skb(skb);
 197         }
 198
 199         bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
 200
 201         param.zero = cpu_to_le16(0);
 202         param.baud_rate = cpu_to_le32(speed);
 203
 204         /* This Broadcom specific command changes the UART's controller baud
 205          * rate.
 206          */
 207         skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), &param,
 208                              HCI_INIT_TIMEOUT);
 209         if (IS_ERR(skb)) {
 210                 int err = PTR_ERR(skb);
 211                 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
 212                            err);
 213                 return err;
 214         }
 215
 216         kfree_skb(skb);
 217
 218         return 0;
 219 }
 220
 221 /* bcm_device_exists should be protected by bcm_device_lock */
 222 static bool bcm_device_exists(struct bcm_device *device)
 223 {
 224         struct list_head *p;
 225
 226 #ifdef CONFIG_PM
 227         /* Devices using serdev always exist */
 228         if (device && device->hu && device->hu->serdev)
 229                 return true;
 230 #endif
 231
 232         list_for_each(p, &bcm_device_list) {
 233                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 234
 235                 if (device == dev)
 236                         return true;
 237         }
 238
 239         return false;
 240 }
 241
 242 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
 243 {
 244         int err;
 245
 246         if (powered && !dev->res_enabled) {
 247                 /* Intel Macs use bcm_apple_get_resources() and don't
 248                  * have regulator supplies configured.
 249                  */
 250                 if (dev->supplies[0].supply) {
 251                         err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
 252                                                     dev->supplies);
 253                         if (err)
 254                                 return err;
 255                 }
 256
 257                 /* LPO clock needs to be 32.768 kHz */
 258                 err = clk_set_rate(dev->lpo_clk, 32768);
 259                 if (err) {
 260                         dev_err(dev->dev, "Could not set LPO clock rate\n");
 261                         goto err_regulator_disable;
 262                 }
 263
 264                 err = clk_prepare_enable(dev->lpo_clk);
 265                 if (err)
 266                         goto err_regulator_disable;
 267
 268                 err = clk_prepare_enable(dev->txco_clk);
 269                 if (err)
 270                         goto err_lpo_clk_disable;
 271         }
 272
 273         err = dev->set_shutdown(dev, powered);
 274         if (err)
 275                 goto err_txco_clk_disable;
 276
 277         err = dev->set_device_wakeup(dev, powered);
 278         if (err)
 279                 goto err_revert_shutdown;
 280
 281         if (!powered && dev->res_enabled) {
 282                 clk_disable_unprepare(dev->txco_clk);
 283                 clk_disable_unprepare(dev->lpo_clk);
 284
 285                 /* Intel Macs use bcm_apple_get_resources() and don't
 286                  * have regulator supplies configured.
 287                  */
 288                 if (dev->supplies[0].supply)
 289                         regulator_bulk_disable(BCM_NUM_SUPPLIES,
 290                                                dev->supplies);
 291         }
 292
 293         /* wait for device to power on and come out of reset */
 294         usleep_range(100000, 120000);
 295
 296         dev->res_enabled = powered;
 297
 298         return 0;
 299
 300 err_revert_shutdown:
 301         dev->set_shutdown(dev, !powered);
 302 err_txco_clk_disable:
 303         if (powered && !dev->res_enabled)
 304                 clk_disable_unprepare(dev->txco_clk);
 305 err_lpo_clk_disable:
 306         if (powered && !dev->res_enabled)
 307                 clk_disable_unprepare(dev->lpo_clk);
 308 err_regulator_disable:
 309         if (powered && !dev->res_enabled)
 310                 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
 311         return err;
 312 }
 313
 314 #ifdef CONFIG_PM
 315 static irqreturn_t bcm_host_wake(int irq, void *data)
 316 {
 317         struct bcm_device *bdev = data;
 318
 319         bt_dev_dbg(bdev, "Host wake IRQ");
 320
 321         pm_runtime_get(bdev->dev);
 322         pm_runtime_mark_last_busy(bdev->dev);
 323         pm_runtime_put_autosuspend(bdev->dev);
 324
 325         return IRQ_HANDLED;
 326 }
 327
 328 static int bcm_request_irq(struct bcm_data *bcm)
 329 {
 330         struct bcm_device *bdev = bcm->dev;
 331         int err;
 332
 333         mutex_lock(&bcm_device_lock);
 334         if (!bcm_device_exists(bdev)) {
 335                 err = -ENODEV;
 336                 goto unlock;
 337         }
 338
 339         if (bdev->irq <= 0) {
 340                 err = -EOPNOTSUPP;
 341                 goto unlock;
 342         }
 343
 344         err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
 345                                bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
 346                                                       IRQF_TRIGGER_RISING,
 347                                "host_wake", bdev);
 348         if (err) {
 349                 bdev->irq = err;
 350                 goto unlock;
 351         }
 352
 353         bdev->irq_acquired = true;
 354
 355         device_init_wakeup(bdev->dev, true);
 356
 357         pm_runtime_set_autosuspend_delay(bdev->dev,
 358                                          BCM_AUTOSUSPEND_DELAY);
 359         pm_runtime_use_autosuspend(bdev->dev);
 360         pm_runtime_set_active(bdev->dev);
 361         pm_runtime_enable(bdev->dev);
 362
 363 unlock:
 364         mutex_unlock(&bcm_device_lock);
 365
 366         return err;
 367 }
 368
 369 static const struct bcm_set_sleep_mode default_sleep_params = {
 370         .sleep_mode = 1,        /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
 371         .idle_host = 2,         /* idle threshold HOST, in 300ms */
 372         .idle_dev = 2,          /* idle threshold device, in 300ms */
 373         .bt_wake_active = 1,    /* BT_WAKE active mode: 1 = high, 0 = low */
 374         .host_wake_active = 0,  /* HOST_WAKE active mode: 1 = high, 0 = low */
 375         .allow_host_sleep = 1,  /* Allow host sleep in SCO flag */
 376         .combine_modes = 1,     /* Combine sleep and LPM flag */
 377         .tristate_control = 0,  /* Allow tri-state control of UART tx flag */
 378         /* Irrelevant USB flags */
 379         .usb_auto_sleep = 0,
 380         .usb_resume_timeout = 0,
 381         .break_to_host = 0,
 382         .pulsed_host_wake = 1,
 383 };
 384
 385 static int bcm_setup_sleep(struct hci_uart *hu)
 386 {
 387         struct bcm_data *bcm = hu->priv;
 388         struct sk_buff *skb;
 389         struct bcm_set_sleep_mode sleep_params = default_sleep_params;
 390
 391         sleep_params.host_wake_active = !bcm->dev->irq_active_low;
 392
 393         skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
 394                              &sleep_params, HCI_INIT_TIMEOUT);
 395         if (IS_ERR(skb)) {
 396                 int err = PTR_ERR(skb);
 397                 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
 398                 return err;
 399         }
 400         kfree_skb(skb);
 401
 402         bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
 403
 404         return 0;
 405 }
 406 #else
 407 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
 408 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
 409 #endif
 410
 411 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
 412 {
 413         struct hci_uart *hu = hci_get_drvdata(hdev);
 414         struct bcm_data *bcm = hu->priv;
 415         struct sk_buff *skb;
 416
 417         if (!test_bit(HCI_RUNNING, &hdev->flags))
 418                 return -ENETDOWN;
 419
 420         skb = bt_skb_alloc(3, GFP_KERNEL);
 421         if (!skb)
 422                 return -ENOMEM;
 423
 424         skb_put_u8(skb, BCM_LM_DIAG_PKT);
 425         skb_put_u8(skb, 0xf0);
 426         skb_put_u8(skb, enable);
 427
 428         skb_queue_tail(&bcm->txq, skb);
 429         hci_uart_tx_wakeup(hu);
 430
 431         return 0;
 432 }
 433
 434 static int bcm_open(struct hci_uart *hu)
 435 {
 436         struct bcm_data *bcm;
 437         struct list_head *p;
 438         int err;
 439
 440         bt_dev_dbg(hu->hdev, "hu %p", hu);
 441
 442         if (!hci_uart_has_flow_control(hu))
 443                 return -EOPNOTSUPP;
 444
 445         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
 446         if (!bcm)
 447                 return -ENOMEM;
 448
 449         skb_queue_head_init(&bcm->txq);
 450
 451         hu->priv = bcm;
 452
 453         mutex_lock(&bcm_device_lock);
 454
 455         if (hu->serdev) {
 456                 bcm->dev = serdev_device_get_drvdata(hu->serdev);
 457                 goto out;
 458         }
 459
 460         if (!hu->tty->dev)
 461                 goto out;
 462
 463         list_for_each(p, &bcm_device_list) {
 464                 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
 465
 466                 /* Retrieve saved bcm_device based on parent of the
 467                  * platform device (saved during device probe) and
 468                  * parent of tty device used by hci_uart
 469                  */
 470                 if (hu->tty->dev->parent == dev->dev->parent) {
 471                         bcm->dev = dev;
 472 #ifdef CONFIG_PM
 473                         dev->hu = hu;
 474 #endif
 475                         break;
 476                 }
 477         }
 478
 479 out:
 480         if (bcm->dev) {
 481                 if (bcm->dev->use_autobaud_mode)
 482                         hci_uart_set_flow_control(hu, false);   /* Assert BT_UART_CTS_N */
 483                 else if (bcm->dev->drive_rts_on_open)
 484                         hci_uart_set_flow_control(hu, true);
 485
 486                 if (bcm->dev->use_autobaud_mode && bcm->dev->max_autobaud_speed)
 487                         hu->init_speed = min(bcm->dev->oper_speed, bcm->dev->max_autobaud_speed);
 488                 else
 489                         hu->init_speed = bcm->dev->init_speed;
 490
 491                 /* If oper_speed is set, ldisc/serdev will set the baudrate
 492                  * before calling setup()
 493                  */
 494                 if (!bcm->dev->no_early_set_baudrate && !bcm->dev->use_autobaud_mode)
 495                         hu->oper_speed = bcm->dev->oper_speed;
 496
 497                 err = bcm_gpio_set_power(bcm->dev, true);
 498
 499                 if (bcm->dev->drive_rts_on_open)
 500                         hci_uart_set_flow_control(hu, false);
 501
 502                 if (err)
 503                         goto err_unset_hu;
 504         }
 505
 506         mutex_unlock(&bcm_device_lock);
 507         return 0;
 508
 509 err_unset_hu:
 510 #ifdef CONFIG_PM
 511         if (!hu->serdev)
 512                 bcm->dev->hu = NULL;
 513 #endif
 514         mutex_unlock(&bcm_device_lock);
 515         hu->priv = NULL;
 516         kfree(bcm);
 517         return err;
 518 }
 519
 520 static int bcm_close(struct hci_uart *hu)
 521 {
 522         struct bcm_data *bcm = hu->priv;
 523         struct bcm_device *bdev = NULL;
 524         int err;
 525
 526         bt_dev_dbg(hu->hdev, "hu %p", hu);
 527
 528         /* Protect bcm->dev against removal of the device or driver */
 529         mutex_lock(&bcm_device_lock);
 530
 531         if (hu->serdev) {
 532                 bdev = serdev_device_get_drvdata(hu->serdev);
 533         } else if (bcm_device_exists(bcm->dev)) {
 534                 bdev = bcm->dev;
 535 #ifdef CONFIG_PM
 536                 bdev->hu = NULL;
 537 #endif
 538         }
 539
 540         if (bdev) {
 541                 if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
 542                         devm_free_irq(bdev->dev, bdev->irq, bdev);
 543                         device_init_wakeup(bdev->dev, false);
 544                         pm_runtime_disable(bdev->dev);
 545                 }
 546
 547                 err = bcm_gpio_set_power(bdev, false);
 548                 if (err)
 549                         bt_dev_err(hu->hdev, "Failed to power down");
 550                 else
 551                         pm_runtime_set_suspended(bdev->dev);
 552         }
 553         mutex_unlock(&bcm_device_lock);
 554
 555         skb_queue_purge(&bcm->txq);
 556         kfree_skb(bcm->rx_skb);
 557         kfree(bcm);
 558
 559         hu->priv = NULL;
 560         return 0;
 561 }
 562
 563 static int bcm_flush(struct hci_uart *hu)
 564 {
 565         struct bcm_data *bcm = hu->priv;
 566
 567         bt_dev_dbg(hu->hdev, "hu %p", hu);
 568
 569         skb_queue_purge(&bcm->txq);
 570
 571         return 0;
 572 }
 573
 574 static int bcm_setup(struct hci_uart *hu)
 575 {
 576         struct bcm_data *bcm = hu->priv;
 577         bool fw_load_done = false;
 578         bool use_autobaud_mode = (bcm->dev ? bcm->dev->use_autobaud_mode : 0);
 579         unsigned int speed;
 580         int err;
 581
 582         bt_dev_dbg(hu->hdev, "hu %p", hu);
 583
 584         hu->hdev->set_diag = bcm_set_diag;
 585         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
 586
 587         err = btbcm_initialize(hu->hdev, &fw_load_done, use_autobaud_mode);
 588         if (err)
 589                 return err;
 590
 591         if (!fw_load_done)
 592                 return 0;
 593
 594         /* Init speed if any */
 595         if (bcm->dev && bcm->dev->init_speed)
 596                 speed = bcm->dev->init_speed;
 597         else if (hu->proto->init_speed)
 598                 speed = hu->proto->init_speed;
 599         else
 600                 speed = 0;
 601
 602         if (speed)
 603                 host_set_baudrate(hu, speed);
 604
 605         /* Operational speed if any */
 606         if (hu->oper_speed)
 607                 speed = hu->oper_speed;
 608         else if (bcm->dev && bcm->dev->oper_speed)
 609                 speed = bcm->dev->oper_speed;
 610         else if (hu->proto->oper_speed)
 611                 speed = hu->proto->oper_speed;
 612         else
 613                 speed = 0;
 614
 615         if (speed) {
 616                 err = bcm_set_baudrate(hu, speed);
 617                 if (!err)
 618                         host_set_baudrate(hu, speed);
 619         }
 620
 621         /* PCM parameters if provided */
 622         if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
 623                 struct bcm_set_pcm_int_params params;
 624
 625                 btbcm_read_pcm_int_params(hu->hdev, &params);
 626
 627                 memcpy(&params, bcm->dev->pcm_int_params, 5);
 628                 btbcm_write_pcm_int_params(hu->hdev, &params);
 629         }
 630
 631         err = btbcm_finalize(hu->hdev, &fw_load_done, use_autobaud_mode);
 632         if (err)
 633                 return err;
 634
 635         /* Some devices ship with the controller default address.
 636          * Allow the bootloader to set a valid address through the
 637          * device tree.
 638          */
 639         set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
 640
 641         if (!bcm_request_irq(bcm))
 642                 err = bcm_setup_sleep(hu);
 643
 644         return err;
 645 }
 646
 647 #define BCM_RECV_LM_DIAG \
 648         .type = BCM_LM_DIAG_PKT, \
 649         .hlen = BCM_LM_DIAG_SIZE, \
 650         .loff = 0, \
 651         .lsize = 0, \
 652         .maxlen = BCM_LM_DIAG_SIZE
 653
 654 #define BCM_RECV_NULL \
 655         .type = BCM_NULL_PKT, \
 656         .hlen = BCM_NULL_SIZE, \
 657         .loff = 0, \
 658         .lsize = 0, \
 659         .maxlen = BCM_NULL_SIZE
 660
 661 #define BCM_RECV_TYPE49 \
 662         .type = BCM_TYPE49_PKT, \
 663         .hlen = BCM_TYPE49_SIZE, \
 664         .loff = 0, \
 665         .lsize = 0, \
 666         .maxlen = BCM_TYPE49_SIZE
 667
 668 #define BCM_RECV_TYPE52 \
 669         .type = BCM_TYPE52_PKT, \
 670         .hlen = BCM_TYPE52_SIZE, \
 671         .loff = 0, \
 672         .lsize = 0, \
 673         .maxlen = BCM_TYPE52_SIZE
 674
 675 static const struct h4_recv_pkt bcm_recv_pkts[] = {
 676         { H4_RECV_ACL,      .recv = hci_recv_frame },
 677         { H4_RECV_SCO,      .recv = hci_recv_frame },
 678         { H4_RECV_EVENT,    .recv = hci_recv_frame },
 679         { H4_RECV_ISO,      .recv = hci_recv_frame },
 680         { BCM_RECV_LM_DIAG, .recv = hci_recv_diag  },
 681         { BCM_RECV_NULL,    .recv = hci_recv_diag  },
 682         { BCM_RECV_TYPE49,  .recv = hci_recv_diag  },
 683         { BCM_RECV_TYPE52,  .recv = hci_recv_diag  },
 684 };
 685
 686 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
 687 {
 688         struct bcm_data *bcm = hu->priv;
 689
 690         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 691                 return -EUNATCH;
 692
 693         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 694                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 695         if (IS_ERR(bcm->rx_skb)) {
 696                 int err = PTR_ERR(bcm->rx_skb);
 697                 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
 698                 bcm->rx_skb = NULL;
 699                 return err;
 700         } else if (!bcm->rx_skb) {
 701                 /* Delay auto-suspend when receiving completed packet */
 702                 mutex_lock(&bcm_device_lock);
 703                 if (bcm->dev && bcm_device_exists(bcm->dev)) {
 704                         pm_runtime_get(bcm->dev->dev);
 705                         pm_runtime_mark_last_busy(bcm->dev->dev);
 706                         pm_runtime_put_autosuspend(bcm->dev->dev);
 707                 }
 708                 mutex_unlock(&bcm_device_lock);
 709         }
 710
 711         return count;
 712 }
 713
 714 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 715 {
 716         struct bcm_data *bcm = hu->priv;
 717
 718         bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
 719
 720         /* Prepend skb with frame type */
 721         memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 722         skb_queue_tail(&bcm->txq, skb);
 723
 724         return 0;
 725 }
 726
 727 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 728 {
 729         struct bcm_data *bcm = hu->priv;
 730         struct sk_buff *skb = NULL;
 731         struct bcm_device *bdev = NULL;
 732
 733         mutex_lock(&bcm_device_lock);
 734
 735         if (bcm_device_exists(bcm->dev)) {
 736                 bdev = bcm->dev;
 737                 pm_runtime_get_sync(bdev->dev);
 738                 /* Shall be resumed here */
 739         }
 740
 741         skb = skb_dequeue(&bcm->txq);
 742
 743         if (bdev) {
 744                 pm_runtime_mark_last_busy(bdev->dev);
 745                 pm_runtime_put_autosuspend(bdev->dev);
 746         }
 747
 748         mutex_unlock(&bcm_device_lock);
 749
 750         return skb;
 751 }
 752
 753 #ifdef CONFIG_PM
 754 static int bcm_suspend_device(struct device *dev)
 755 {
 756         struct bcm_device *bdev = dev_get_drvdata(dev);
 757         int err;
 758
 759         bt_dev_dbg(bdev, "");
 760
 761         if (!bdev->is_suspended && bdev->hu) {
 762                 hci_uart_set_flow_control(bdev->hu, true);
 763
 764                 /* Once this returns, driver suspends BT via GPIO */
 765                 bdev->is_suspended = true;
 766         }
 767
 768         /* Suspend the device */
 769         err = bdev->set_device_wakeup(bdev, false);
 770         if (err) {
 771                 if (bdev->is_suspended && bdev->hu) {
 772                         bdev->is_suspended = false;
 773                         hci_uart_set_flow_control(bdev->hu, false);
 774                 }
 775                 return -EBUSY;
 776         }
 777
 778         bt_dev_dbg(bdev, "suspend, delaying 15 ms");
 779         msleep(15);
 780
 781         return 0;
 782 }
 783
 784 static int bcm_resume_device(struct device *dev)
 785 {
 786         struct bcm_device *bdev = dev_get_drvdata(dev);
 787         int err;
 788
 789         bt_dev_dbg(bdev, "");
 790
 791         err = bdev->set_device_wakeup(bdev, true);
 792         if (err) {
 793                 dev_err(dev, "Failed to power up\n");
 794                 return err;
 795         }
 796
 797         bt_dev_dbg(bdev, "resume, delaying 15 ms");
 798         msleep(15);
 799
 800         /* When this executes, the device has woken up already */
 801         if (bdev->is_suspended && bdev->hu) {
 802                 bdev->is_suspended = false;
 803
 804                 hci_uart_set_flow_control(bdev->hu, false);
 805         }
 806
 807         return 0;
 808 }
 809 #endif
 810
 811 #ifdef CONFIG_PM_SLEEP
 812 /* suspend callback */
 813 static int bcm_suspend(struct device *dev)
 814 {
 815         struct bcm_device *bdev = dev_get_drvdata(dev);
 816         int error;
 817
 818         bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
 819
 820         /*
 821          * When used with a device instantiated as platform_device, bcm_suspend
 822          * can be called at any time as long as the platform device is bound,
 823          * so it should use bcm_device_lock to protect access to hci_uart
 824          * and device_wake-up GPIO.
 825          */
 826         mutex_lock(&bcm_device_lock);
 827
 828         if (!bdev->hu)
 829                 goto unlock;
 830
 831         if (pm_runtime_active(dev))
 832                 bcm_suspend_device(dev);
 833
 834         if (device_may_wakeup(dev) && bdev->irq > 0) {
 835                 error = enable_irq_wake(bdev->irq);
 836                 if (!error)
 837                         bt_dev_dbg(bdev, "BCM irq: enabled");
 838         }
 839
 840 unlock:
 841         mutex_unlock(&bcm_device_lock);
 842
 843         return 0;
 844 }
 845
 846 /* resume callback */
 847 static int bcm_resume(struct device *dev)
 848 {
 849         struct bcm_device *bdev = dev_get_drvdata(dev);
 850         int err = 0;
 851
 852         bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
 853
 854         /*
 855          * When used with a device instantiated as platform_device, bcm_resume
 856          * can be called at any time as long as platform device is bound,
 857          * so it should use bcm_device_lock to protect access to hci_uart
 858          * and device_wake-up GPIO.
 859          */
 860         mutex_lock(&bcm_device_lock);
 861
 862         if (!bdev->hu)
 863                 goto unlock;
 864
 865         if (device_may_wakeup(dev) && bdev->irq > 0) {
 866                 disable_irq_wake(bdev->irq);
 867                 bt_dev_dbg(bdev, "BCM irq: disabled");
 868         }
 869
 870         err = bcm_resume_device(dev);
 871
 872 unlock:
 873         mutex_unlock(&bcm_device_lock);
 874
 875         if (!err) {
 876                 pm_runtime_disable(dev);
 877                 pm_runtime_set_active(dev);
 878                 pm_runtime_enable(dev);
 879         }
 880
 881         return 0;
 882 }
 883 #endif
 884
 885 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
 886 static struct gpiod_lookup_table asus_tf103c_irq_gpios = {
 887         .dev_id = "serial0-0",
 888         .table = {
 889                 GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
 890                 { }
 891         },
 892 };
 893
 894 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
 895         {
 896                 .ident = "Asus TF103C",
 897                 .matches = {
 898                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 899                         DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
 900                 },
 901                 .driver_data = &asus_tf103c_irq_gpios,
 902         },
 903         {
 904                 .ident = "Meegopad T08",
 905                 .matches = {
 906                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
 907                                         "To be filled by OEM."),
 908                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 909                         DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
 910                 },
 911         },
 912         { }
 913 };
 914
 915 #ifdef CONFIG_ACPI
 916 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
 917 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
 918 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
 919
 920 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
 921         { "device-wakeup-gpios", &first_gpio, 1 },
 922         { "shutdown-gpios", &second_gpio, 1 },
 923         { "host-wakeup-gpios", &third_gpio, 1 },
 924         { },
 925 };
 926
 927 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
 928         { "host-wakeup-gpios", &first_gpio, 1 },
 929         { "device-wakeup-gpios", &second_gpio, 1 },
 930         { "shutdown-gpios", &third_gpio, 1 },
 931         { },
 932 };
 933
 934 static int bcm_resource(struct acpi_resource *ares, void *data)
 935 {
 936         struct bcm_device *dev = data;
 937         struct acpi_resource_extended_irq *irq;
 938         struct acpi_resource_gpio *gpio;
 939         struct acpi_resource_uart_serialbus *sb;
 940
 941         switch (ares->type) {
 942         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 943                 irq = &ares->data.extended_irq;
 944                 if (irq->polarity != ACPI_ACTIVE_LOW)
 945                         dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
 946                 dev->irq_active_low = true;
 947                 break;
 948
 949         case ACPI_RESOURCE_TYPE_GPIO:
 950                 gpio = &ares->data.gpio;
 951                 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
 952                         dev->gpio_int_idx = dev->gpio_count;
 953                         dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
 954                 }
 955                 dev->gpio_count++;
 956                 break;
 957
 958         case ACPI_RESOURCE_TYPE_SERIAL_BUS:
 959                 sb = &ares->data.uart_serial_bus;
 960                 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
 961                         dev->init_speed = sb->default_baud_rate;
 962                         dev->oper_speed = 4000000;
 963                 }
 964                 break;
 965
 966         default:
 967                 break;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
 974 {
 975         if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
 976                 return -EIO;
 977
 978         return 0;
 979 }
 980
 981 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
 982 {
 983         if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
 984                                               NULL, NULL, NULL)))
 985                 return -EIO;
 986
 987         return 0;
 988 }
 989
 990 static int bcm_apple_get_resources(struct bcm_device *dev)
 991 {
 992         struct acpi_device *adev = ACPI_COMPANION(dev->dev);
 993         const union acpi_object *obj;
 994
 995         if (!adev ||
 996             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
 997             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
 998             ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
 999                 return -ENODEV;
1000
1001         if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
1002             obj->buffer.length == 8)
1003                 dev->init_speed = *(u64 *)obj->buffer.pointer;
1004
1005         dev->set_device_wakeup = bcm_apple_set_device_wakeup;
1006         dev->set_shutdown = bcm_apple_set_shutdown;
1007
1008         return 0;
1009 }
1010 #else
1011 static inline int bcm_apple_get_resources(struct bcm_device *dev)
1012 {
1013         return -EOPNOTSUPP;
1014 }
1015 #endif /* CONFIG_ACPI */
1016
1017 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
1018 {
1019         gpiod_set_value_cansleep(dev->device_wakeup, awake);
1020         return 0;
1021 }
1022
1023 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
1024 {
1025         gpiod_set_value_cansleep(dev->shutdown, powered);
1026         if (dev->reset)
1027                 /*
1028                  * The reset line is asserted on powerdown and deasserted
1029                  * on poweron so the inverse of powered is used. Notice
1030                  * that the GPIO line BT_RST_N needs to be specified as
1031                  * active low in the device tree or similar system
1032                  * description.
1033                  */
1034                 gpiod_set_value_cansleep(dev->reset, !powered);
1035         return 0;
1036 }
1037
1038 /* Try a bunch of names for TXCO */
1039 static struct clk *bcm_get_txco(struct device *dev)
1040 {
1041         struct clk *clk;
1042
1043         /* New explicit name */
1044         clk = devm_clk_get(dev, "txco");
1045         if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1046                 return clk;
1047
1048         /* Deprecated name */
1049         clk = devm_clk_get(dev, "extclk");
1050         if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
1051                 return clk;
1052
1053         /* Original code used no name at all */
1054         return devm_clk_get(dev, NULL);
1055 }
1056
1057 static int bcm_get_resources(struct bcm_device *dev)
1058 {
1059         const struct dmi_system_id *broken_irq_dmi_id;
1060         const char *irq_con_id = "host-wakeup";
1061         int err;
1062
1063         dev->name = dev_name(dev->dev);
1064
1065         if (x86_apple_machine && !bcm_apple_get_resources(dev))
1066                 return 0;
1067
1068         dev->txco_clk = bcm_get_txco(dev->dev);
1069
1070         /* Handle deferred probing */
1071         if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
1072                 return PTR_ERR(dev->txco_clk);
1073
1074         /* Ignore all other errors as before */
1075         if (IS_ERR(dev->txco_clk))
1076                 dev->txco_clk = NULL;
1077
1078         dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
1079         if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
1080                 return PTR_ERR(dev->lpo_clk);
1081
1082         if (IS_ERR(dev->lpo_clk))
1083                 dev->lpo_clk = NULL;
1084
1085         /* Check if we accidentally fetched the lpo clock twice */
1086         if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
1087                 devm_clk_put(dev->dev, dev->txco_clk);
1088                 dev->txco_clk = NULL;
1089         }
1090
1091         dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
1092                                                      GPIOD_OUT_LOW);
1093         if (IS_ERR(dev->device_wakeup))
1094                 return PTR_ERR(dev->device_wakeup);
1095
1096         dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
1097                                                 GPIOD_OUT_LOW);
1098         if (IS_ERR(dev->shutdown))
1099                 return PTR_ERR(dev->shutdown);
1100
1101         dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
1102                                              GPIOD_OUT_LOW);
1103         if (IS_ERR(dev->reset))
1104                 return PTR_ERR(dev->reset);
1105
1106         dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
1107         dev->set_shutdown = bcm_gpio_set_shutdown;
1108
1109         dev->supplies[0].supply = "vbat";
1110         dev->supplies[1].supply = "vddio";
1111         err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
1112                                       dev->supplies);
1113         if (err)
1114                 return err;
1115
1116         broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
1117         if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
1118                 gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
1119                 irq_con_id = "host-wakeup-alt";
1120                 dev->irq_active_low = false;
1121                 dev->irq = 0;
1122         }
1123
1124         /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
1125         if (dev->irq <= 0) {
1126                 struct gpio_desc *gpio;
1127
1128                 gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
1129                 if (IS_ERR(gpio))
1130                         return PTR_ERR(gpio);
1131
1132                 dev->irq = gpiod_to_irq(gpio);
1133         }
1134
1135         if (broken_irq_dmi_id) {
1136                 if (broken_irq_dmi_id->driver_data) {
1137                         gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
1138                 } else {
1139                         dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
1140                                  broken_irq_dmi_id->ident);
1141                         dev->irq = 0;
1142                 }
1143         }
1144
1145         dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
1146         return 0;
1147 }
1148
1149 #ifdef CONFIG_ACPI
1150 static int bcm_acpi_probe(struct bcm_device *dev)
1151 {
1152         LIST_HEAD(resources);
1153         const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
1154         struct resource_entry *entry;
1155         int ret;
1156
1157         /* Retrieve UART ACPI info */
1158         dev->gpio_int_idx = -1;
1159         ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
1160                                      &resources, bcm_resource, dev);
1161         if (ret < 0)
1162                 return ret;
1163
1164         resource_list_for_each_entry(entry, &resources) {
1165                 if (resource_type(entry->res) == IORESOURCE_IRQ) {
1166                         dev->irq = entry->res->start;
1167                         break;
1168                 }
1169         }
1170         acpi_dev_free_resource_list(&resources);
1171
1172         /* If the DSDT uses an Interrupt resource for the IRQ, then there are
1173          * only 2 GPIO resources, we use the irq-last mapping for this, since
1174          * we already have an irq the 3th / last mapping will not be used.
1175          */
1176         if (dev->irq)
1177                 gpio_mapping = acpi_bcm_int_last_gpios;
1178         else if (dev->gpio_int_idx == 0)
1179                 gpio_mapping = acpi_bcm_int_first_gpios;
1180         else if (dev->gpio_int_idx == 2)
1181                 gpio_mapping = acpi_bcm_int_last_gpios;
1182         else
1183                 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
1184                          dev->gpio_int_idx);
1185
1186         /* Warn if our expectations are not met. */
1187         if (dev->gpio_count != (dev->irq ? 2 : 3))
1188                 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
1189                          dev->gpio_count);
1190
1191         ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
1192         if (ret)
1193                 return ret;
1194
1195         if (irq_polarity != -1) {
1196                 dev->irq_active_low = irq_polarity;
1197                 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1198                          dev->irq_active_low ? "low" : "high");
1199         }
1200
1201         return 0;
1202 }
1203 #else
1204 static int bcm_acpi_probe(struct bcm_device *dev)
1205 {
1206         return -EINVAL;
1207 }
1208 #endif /* CONFIG_ACPI */
1209
1210 static int bcm_of_probe(struct bcm_device *bdev)
1211 {
1212         bdev->use_autobaud_mode = device_property_read_bool(bdev->dev,
1213                                                             "brcm,requires-autobaud-mode");
1214         device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1215         device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
1216                                       bdev->pcm_int_params, 5);
1217         bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
1218         bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
1219                              & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
1220         return 0;
1221 }
1222
1223 static int bcm_probe(struct platform_device *pdev)
1224 {
1225         struct bcm_device *dev;
1226         int ret;
1227
1228         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1229         if (!dev)
1230                 return -ENOMEM;
1231
1232         dev->dev = &pdev->dev;
1233
1234         ret = platform_get_irq(pdev, 0);
1235         if (ret < 0)
1236                 return ret;
1237
1238         dev->irq = ret;
1239
1240         /* Initialize routing field to an unused value */
1241         dev->pcm_int_params[0] = 0xff;
1242
1243         if (has_acpi_companion(&pdev->dev)) {
1244                 ret = bcm_acpi_probe(dev);
1245                 if (ret)
1246                         return ret;
1247         }
1248
1249         ret = bcm_get_resources(dev);
1250         if (ret)
1251                 return ret;
1252
1253         platform_set_drvdata(pdev, dev);
1254
1255         dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1256
1257         /* Place this instance on the device list */
1258         mutex_lock(&bcm_device_lock);
1259         list_add_tail(&dev->list, &bcm_device_list);
1260         mutex_unlock(&bcm_device_lock);
1261
1262         ret = bcm_gpio_set_power(dev, false);
1263         if (ret)
1264                 dev_err(&pdev->dev, "Failed to power down\n");
1265
1266         return 0;
1267 }
1268
1269 static int bcm_remove(struct platform_device *pdev)
1270 {
1271         struct bcm_device *dev = platform_get_drvdata(pdev);
1272
1273         mutex_lock(&bcm_device_lock);
1274         list_del(&dev->list);
1275         mutex_unlock(&bcm_device_lock);
1276
1277         dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1278
1279         return 0;
1280 }
1281
1282 static const struct hci_uart_proto bcm_proto = {
1283         .id             = HCI_UART_BCM,
1284         .name           = "Broadcom",
1285         .manufacturer   = 15,
1286         .init_speed     = 115200,
1287         .open           = bcm_open,
1288         .close          = bcm_close,
1289         .flush          = bcm_flush,
1290         .setup          = bcm_setup,
1291         .set_baudrate   = bcm_set_baudrate,
1292         .recv           = bcm_recv,
1293         .enqueue        = bcm_enqueue,
1294         .dequeue        = bcm_dequeue,
1295 };
1296
1297 #ifdef CONFIG_ACPI
1298 static const struct acpi_device_id bcm_acpi_match[] = {
1299         { "BCM2E00" },
1300         { "BCM2E01" },
1301         { "BCM2E02" },
1302         { "BCM2E03" },
1303         { "BCM2E04" },
1304         { "BCM2E05" },
1305         { "BCM2E06" },
1306         { "BCM2E07" },
1307         { "BCM2E08" },
1308         { "BCM2E09" },
1309         { "BCM2E0A" },
1310         { "BCM2E0B" },
1311         { "BCM2E0C" },
1312         { "BCM2E0D" },
1313         { "BCM2E0E" },
1314         { "BCM2E0F" },
1315         { "BCM2E10" },
1316         { "BCM2E11" },
1317         { "BCM2E12" },
1318         { "BCM2E13" },
1319         { "BCM2E14" },
1320         { "BCM2E15" },
1321         { "BCM2E16" },
1322         { "BCM2E17" },
1323         { "BCM2E18" },
1324         { "BCM2E19" },
1325         { "BCM2E1A" },
1326         { "BCM2E1B" },
1327         { "BCM2E1C" },
1328         { "BCM2E1D" },
1329         { "BCM2E1F" },
1330         { "BCM2E20" },
1331         { "BCM2E21" },
1332         { "BCM2E22" },
1333         { "BCM2E23" },
1334         { "BCM2E24" },
1335         { "BCM2E25" },
1336         { "BCM2E26" },
1337         { "BCM2E27" },
1338         { "BCM2E28" },
1339         { "BCM2E29" },
1340         { "BCM2E2A" },
1341         { "BCM2E2B" },
1342         { "BCM2E2C" },
1343         { "BCM2E2D" },
1344         { "BCM2E2E" },
1345         { "BCM2E2F" },
1346         { "BCM2E30" },
1347         { "BCM2E31" },
1348         { "BCM2E32" },
1349         { "BCM2E33" },
1350         { "BCM2E34" },
1351         { "BCM2E35" },
1352         { "BCM2E36" },
1353         { "BCM2E37" },
1354         { "BCM2E38" },
1355         { "BCM2E39" },
1356         { "BCM2E3A" },
1357         { "BCM2E3B" },
1358         { "BCM2E3C" },
1359         { "BCM2E3D" },
1360         { "BCM2E3E" },
1361         { "BCM2E3F" },
1362         { "BCM2E40" },
1363         { "BCM2E41" },
1364         { "BCM2E42" },
1365         { "BCM2E43" },
1366         { "BCM2E44" },
1367         { "BCM2E45" },
1368         { "BCM2E46" },
1369         { "BCM2E47" },
1370         { "BCM2E48" },
1371         { "BCM2E49" },
1372         { "BCM2E4A" },
1373         { "BCM2E4B" },
1374         { "BCM2E4C" },
1375         { "BCM2E4D" },
1376         { "BCM2E4E" },
1377         { "BCM2E4F" },
1378         { "BCM2E50" },
1379         { "BCM2E51" },
1380         { "BCM2E52" },
1381         { "BCM2E53" },
1382         { "BCM2E54" },
1383         { "BCM2E55" },
1384         { "BCM2E56" },
1385         { "BCM2E57" },
1386         { "BCM2E58" },
1387         { "BCM2E59" },
1388         { "BCM2E5A" },
1389         { "BCM2E5B" },
1390         { "BCM2E5C" },
1391         { "BCM2E5D" },
1392         { "BCM2E5E" },
1393         { "BCM2E5F" },
1394         { "BCM2E60" },
1395         { "BCM2E61" },
1396         { "BCM2E62" },
1397         { "BCM2E63" },
1398         { "BCM2E64" },
1399         { "BCM2E65" },
1400         { "BCM2E66" },
1401         { "BCM2E67" },
1402         { "BCM2E68" },
1403         { "BCM2E69" },
1404         { "BCM2E6B" },
1405         { "BCM2E6D" },
1406         { "BCM2E6E" },
1407         { "BCM2E6F" },
1408         { "BCM2E70" },
1409         { "BCM2E71" },
1410         { "BCM2E72" },
1411         { "BCM2E73" },
1412         { "BCM2E74" },
1413         { "BCM2E75" },
1414         { "BCM2E76" },
1415         { "BCM2E77" },
1416         { "BCM2E78" },
1417         { "BCM2E79" },
1418         { "BCM2E7A" },
1419         { "BCM2E7B" },
1420         { "BCM2E7C" },
1421         { "BCM2E7D" },
1422         { "BCM2E7E" },
1423         { "BCM2E7F" },
1424         { "BCM2E80" },
1425         { "BCM2E81" },
1426         { "BCM2E82" },
1427         { "BCM2E83" },
1428         { "BCM2E84" },
1429         { "BCM2E85" },
1430         { "BCM2E86" },
1431         { "BCM2E87" },
1432         { "BCM2E88" },
1433         { "BCM2E89" },
1434         { "BCM2E8A" },
1435         { "BCM2E8B" },
1436         { "BCM2E8C" },
1437         { "BCM2E8D" },
1438         { "BCM2E8E" },
1439         { "BCM2E90" },
1440         { "BCM2E92" },
1441         { "BCM2E93" },
1442         { "BCM2E94" },
1443         { "BCM2E95" },
1444         { "BCM2E96" },
1445         { "BCM2E97" },
1446         { "BCM2E98" },
1447         { "BCM2E99" },
1448         { "BCM2E9A" },
1449         { "BCM2E9B" },
1450         { "BCM2E9C" },
1451         { "BCM2E9D" },
1452         { "BCM2EA0" },
1453         { "BCM2EA1" },
1454         { "BCM2EA2" },
1455         { "BCM2EA3" },
1456         { "BCM2EA4" },
1457         { "BCM2EA5" },
1458         { "BCM2EA6" },
1459         { "BCM2EA7" },
1460         { "BCM2EA8" },
1461         { "BCM2EA9" },
1462         { "BCM2EAA" },
1463         { "BCM2EAB" },
1464         { "BCM2EAC" },
1465         { },
1466 };
1467 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1468 #endif
1469
1470 /* suspend and resume callbacks */
1471 static const struct dev_pm_ops bcm_pm_ops = {
1472         SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1473         SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1474 };
1475
1476 static struct platform_driver bcm_driver = {
1477         .probe = bcm_probe,
1478         .remove = bcm_remove,
1479         .driver = {
1480                 .name = "hci_bcm",
1481                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1482                 .pm = &bcm_pm_ops,
1483         },
1484 };
1485
1486 static int bcm_serdev_probe(struct serdev_device *serdev)
1487 {
1488         struct bcm_device *bcmdev;
1489         const struct bcm_device_data *data;
1490         int err;
1491
1492         bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1493         if (!bcmdev)
1494                 return -ENOMEM;
1495
1496         bcmdev->dev = &serdev->dev;
1497 #ifdef CONFIG_PM
1498         bcmdev->hu = &bcmdev->serdev_hu;
1499 #endif
1500         bcmdev->serdev_hu.serdev = serdev;
1501         serdev_device_set_drvdata(serdev, bcmdev);
1502
1503         /* Initialize routing field to an unused value */
1504         bcmdev->pcm_int_params[0] = 0xff;
1505
1506         if (has_acpi_companion(&serdev->dev))
1507                 err = bcm_acpi_probe(bcmdev);
1508         else
1509                 err = bcm_of_probe(bcmdev);
1510         if (err)
1511                 return err;
1512
1513         err = bcm_get_resources(bcmdev);
1514         if (err)
1515                 return err;
1516
1517         if (!bcmdev->shutdown) {
1518                 dev_warn(&serdev->dev,
1519                          "No reset resource, using default baud rate\n");
1520                 bcmdev->oper_speed = bcmdev->init_speed;
1521         }
1522
1523         err = bcm_gpio_set_power(bcmdev, false);
1524         if (err)
1525                 dev_err(&serdev->dev, "Failed to power down\n");
1526
1527         data = device_get_match_data(bcmdev->dev);
1528         if (data) {
1529                 bcmdev->max_autobaud_speed = data->max_autobaud_speed;
1530                 bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
1531                 bcmdev->drive_rts_on_open = data->drive_rts_on_open;
1532         }
1533
1534         return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1535 }
1536
1537 static void bcm_serdev_remove(struct serdev_device *serdev)
1538 {
1539         struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1540
1541         hci_uart_unregister_device(&bcmdev->serdev_hu);
1542 }
1543
1544 #ifdef CONFIG_OF
1545 static struct bcm_device_data bcm4354_device_data = {
1546         .no_early_set_baudrate = true,
1547 };
1548
1549 static struct bcm_device_data bcm43438_device_data = {
1550         .drive_rts_on_open = true,
1551 };
1552
1553 static struct bcm_device_data cyw55572_device_data = {
1554         .max_autobaud_speed = 921600,
1555 };
1556
1557 static const struct of_device_id bcm_bluetooth_of_match[] = {
1558         { .compatible = "brcm,bcm20702a1" },
1559         { .compatible = "brcm,bcm4329-bt" },
1560         { .compatible = "brcm,bcm4330-bt" },
1561         { .compatible = "brcm,bcm4334-bt" },
1562         { .compatible = "brcm,bcm4345c5" },
1563         { .compatible = "brcm,bcm43430a0-bt" },
1564         { .compatible = "brcm,bcm43430a1-bt" },
1565         { .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
1566         { .compatible = "brcm,bcm4349-bt", .data = &bcm43438_device_data },
1567         { .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
1568         { .compatible = "brcm,bcm4335a0" },
1569         { .compatible = "infineon,cyw55572-bt", .data = &cyw55572_device_data },
1570         { },
1571 };
1572 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1573 #endif
1574
1575 static struct serdev_device_driver bcm_serdev_driver = {
1576         .probe = bcm_serdev_probe,
1577         .remove = bcm_serdev_remove,
1578         .driver = {
1579                 .name = "hci_uart_bcm",
1580                 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1581                 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1582                 .pm = &bcm_pm_ops,
1583         },
1584 };
1585
1586 int __init bcm_init(void)
1587 {
1588         /* For now, we need to keep both platform device
1589          * driver (ACPI generated) and serdev driver (DT).
1590          */
1591         platform_driver_register(&bcm_driver);
1592         serdev_device_driver_register(&bcm_serdev_driver);
1593
1594         return hci_uart_register_proto(&bcm_proto);
1595 }
1596
1597 int __exit bcm_deinit(void)
1598 {
1599         platform_driver_unregister(&bcm_driver);
1600         serdev_device_driver_unregister(&bcm_serdev_driver);
1601
1602         return hci_uart_unregister_proto(&bcm_proto);
1603 }