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/property.h> 17 #include <linux/platform_data/x86/apple.h> 18 #include <linux/platform_device.h> 19 #include <linux/regulator/consumer.h> 20 #include <linux/clk.h> 21 #include <linux/gpio/consumer.h> 22 #include <linux/tty.h> 23 #include <linux/interrupt.h> 24 #include <linux/dmi.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/serdev.h> 27 28 #include <net/bluetooth/bluetooth.h> 29 #include <net/bluetooth/hci_core.h> 30 31 #include "btbcm.h" 32 #include "hci_uart.h" 33 34 #define BCM_NULL_PKT 0x00 35 #define BCM_NULL_SIZE 0 36 37 #define BCM_LM_DIAG_PKT 0x07 38 #define BCM_LM_DIAG_SIZE 63 39 40 #define BCM_TYPE49_PKT 0x31 41 #define BCM_TYPE49_SIZE 0 42 43 #define BCM_TYPE52_PKT 0x34 44 #define BCM_TYPE52_SIZE 0 45 46 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ 47 48 #define BCM_NUM_SUPPLIES 2 49 50 /** 51 * struct bcm_device - device driver resources 52 * @serdev_hu: HCI UART controller struct 53 * @list: bcm_device_list node 54 * @dev: physical UART slave 55 * @name: device name logged by bt_dev_*() functions 56 * @device_wakeup: BT_WAKE pin, 57 * assert = Bluetooth device must wake up or remain awake, 58 * deassert = Bluetooth device may sleep when sleep criteria are met 59 * @shutdown: BT_REG_ON pin, 60 * power up or power down Bluetooth device internal regulators 61 * @set_device_wakeup: callback to toggle BT_WAKE pin 62 * either by accessing @device_wakeup or by calling @btlp 63 * @set_shutdown: callback to toggle BT_REG_ON pin 64 * either by accessing @shutdown or by calling @btpu/@btpd 65 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power") 66 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up") 67 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down") 68 * @txco_clk: external reference frequency clock used by Bluetooth device 69 * @lpo_clk: external LPO clock used by Bluetooth device 70 * @supplies: VBAT and VDDIO supplies used by Bluetooth device 71 * @res_enabled: whether clocks and supplies are prepared and enabled 72 * @init_speed: default baudrate of Bluetooth device; 73 * the host UART is initially set to this baudrate so that 74 * it can configure the Bluetooth device for @oper_speed 75 * @oper_speed: preferred baudrate of Bluetooth device; 76 * set to 0 if @init_speed is already the preferred baudrate 77 * @irq: interrupt triggered by HOST_WAKE_BT pin 78 * @irq_active_low: whether @irq is active low 79 * @hu: pointer to HCI UART controller struct, 80 * used to disable flow control during runtime suspend and system sleep 81 * @is_suspended: whether flow control is currently disabled 82 */ 83 struct bcm_device { 84 /* Must be the first member, hci_serdev.c expects this. */ 85 struct hci_uart serdev_hu; 86 struct list_head list; 87 88 struct device *dev; 89 90 const char *name; 91 struct gpio_desc *device_wakeup; 92 struct gpio_desc *shutdown; 93 int (*set_device_wakeup)(struct bcm_device *, bool); 94 int (*set_shutdown)(struct bcm_device *, bool); 95 #ifdef CONFIG_ACPI 96 acpi_handle btlp, btpu, btpd; 97 int gpio_count; 98 int gpio_int_idx; 99 #endif 100 101 struct clk *txco_clk; 102 struct clk *lpo_clk; 103 struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES]; 104 bool res_enabled; 105 106 u32 init_speed; 107 u32 oper_speed; 108 int irq; 109 bool irq_active_low; 110 111 #ifdef CONFIG_PM 112 struct hci_uart *hu; 113 bool is_suspended; 114 #endif 115 }; 116 117 /* generic bcm uart resources */ 118 struct bcm_data { 119 struct sk_buff *rx_skb; 120 struct sk_buff_head txq; 121 122 struct bcm_device *dev; 123 }; 124 125 /* List of BCM BT UART devices */ 126 static DEFINE_MUTEX(bcm_device_lock); 127 static LIST_HEAD(bcm_device_list); 128 129 static int irq_polarity = -1; 130 module_param(irq_polarity, int, 0444); 131 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low"); 132 133 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 134 { 135 if (hu->serdev) 136 serdev_device_set_baudrate(hu->serdev, speed); 137 else 138 hci_uart_set_baudrate(hu, speed); 139 } 140 141 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) 142 { 143 struct hci_dev *hdev = hu->hdev; 144 struct sk_buff *skb; 145 struct bcm_update_uart_baud_rate param; 146 147 if (speed > 3000000) { 148 struct bcm_write_uart_clock_setting clock; 149 150 clock.type = BCM_UART_CLOCK_48MHZ; 151 152 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type); 153 154 /* This Broadcom specific command changes the UART's controller 155 * clock for baud rate > 3000000. 156 */ 157 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); 158 if (IS_ERR(skb)) { 159 int err = PTR_ERR(skb); 160 bt_dev_err(hdev, "BCM: failed to write clock (%d)", 161 err); 162 return err; 163 } 164 165 kfree_skb(skb); 166 } 167 168 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed); 169 170 param.zero = cpu_to_le16(0); 171 param.baud_rate = cpu_to_le32(speed); 172 173 /* This Broadcom specific command changes the UART's controller baud 174 * rate. 175 */ 176 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, 177 HCI_INIT_TIMEOUT); 178 if (IS_ERR(skb)) { 179 int err = PTR_ERR(skb); 180 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)", 181 err); 182 return err; 183 } 184 185 kfree_skb(skb); 186 187 return 0; 188 } 189 190 /* bcm_device_exists should be protected by bcm_device_lock */ 191 static bool bcm_device_exists(struct bcm_device *device) 192 { 193 struct list_head *p; 194 195 #ifdef CONFIG_PM 196 /* Devices using serdev always exist */ 197 if (device && device->hu && device->hu->serdev) 198 return true; 199 #endif 200 201 list_for_each(p, &bcm_device_list) { 202 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 203 204 if (device == dev) 205 return true; 206 } 207 208 return false; 209 } 210 211 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) 212 { 213 int err; 214 215 if (powered && !dev->res_enabled) { 216 /* Intel Macs use bcm_apple_get_resources() and don't 217 * have regulator supplies configured. 218 */ 219 if (dev->supplies[0].supply) { 220 err = regulator_bulk_enable(BCM_NUM_SUPPLIES, 221 dev->supplies); 222 if (err) 223 return err; 224 } 225 226 /* LPO clock needs to be 32.768 kHz */ 227 err = clk_set_rate(dev->lpo_clk, 32768); 228 if (err) { 229 dev_err(dev->dev, "Could not set LPO clock rate\n"); 230 goto err_regulator_disable; 231 } 232 233 err = clk_prepare_enable(dev->lpo_clk); 234 if (err) 235 goto err_regulator_disable; 236 237 err = clk_prepare_enable(dev->txco_clk); 238 if (err) 239 goto err_lpo_clk_disable; 240 } 241 242 err = dev->set_shutdown(dev, powered); 243 if (err) 244 goto err_txco_clk_disable; 245 246 err = dev->set_device_wakeup(dev, powered); 247 if (err) 248 goto err_revert_shutdown; 249 250 if (!powered && dev->res_enabled) { 251 clk_disable_unprepare(dev->txco_clk); 252 clk_disable_unprepare(dev->lpo_clk); 253 254 /* Intel Macs use bcm_apple_get_resources() and don't 255 * have regulator supplies configured. 256 */ 257 if (dev->supplies[0].supply) 258 regulator_bulk_disable(BCM_NUM_SUPPLIES, 259 dev->supplies); 260 } 261 262 /* wait for device to power on and come out of reset */ 263 usleep_range(10000, 20000); 264 265 dev->res_enabled = powered; 266 267 return 0; 268 269 err_revert_shutdown: 270 dev->set_shutdown(dev, !powered); 271 err_txco_clk_disable: 272 if (powered && !dev->res_enabled) 273 clk_disable_unprepare(dev->txco_clk); 274 err_lpo_clk_disable: 275 if (powered && !dev->res_enabled) 276 clk_disable_unprepare(dev->lpo_clk); 277 err_regulator_disable: 278 if (powered && !dev->res_enabled) 279 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies); 280 return err; 281 } 282 283 #ifdef CONFIG_PM 284 static irqreturn_t bcm_host_wake(int irq, void *data) 285 { 286 struct bcm_device *bdev = data; 287 288 bt_dev_dbg(bdev, "Host wake IRQ"); 289 290 pm_runtime_get(bdev->dev); 291 pm_runtime_mark_last_busy(bdev->dev); 292 pm_runtime_put_autosuspend(bdev->dev); 293 294 return IRQ_HANDLED; 295 } 296 297 static int bcm_request_irq(struct bcm_data *bcm) 298 { 299 struct bcm_device *bdev = bcm->dev; 300 int err; 301 302 mutex_lock(&bcm_device_lock); 303 if (!bcm_device_exists(bdev)) { 304 err = -ENODEV; 305 goto unlock; 306 } 307 308 if (bdev->irq <= 0) { 309 err = -EOPNOTSUPP; 310 goto unlock; 311 } 312 313 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake, 314 bdev->irq_active_low ? IRQF_TRIGGER_FALLING : 315 IRQF_TRIGGER_RISING, 316 "host_wake", bdev); 317 if (err) { 318 bdev->irq = err; 319 goto unlock; 320 } 321 322 device_init_wakeup(bdev->dev, true); 323 324 pm_runtime_set_autosuspend_delay(bdev->dev, 325 BCM_AUTOSUSPEND_DELAY); 326 pm_runtime_use_autosuspend(bdev->dev); 327 pm_runtime_set_active(bdev->dev); 328 pm_runtime_enable(bdev->dev); 329 330 unlock: 331 mutex_unlock(&bcm_device_lock); 332 333 return err; 334 } 335 336 static const struct bcm_set_sleep_mode default_sleep_params = { 337 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */ 338 .idle_host = 2, /* idle threshold HOST, in 300ms */ 339 .idle_dev = 2, /* idle threshold device, in 300ms */ 340 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */ 341 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */ 342 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */ 343 .combine_modes = 1, /* Combine sleep and LPM flag */ 344 .tristate_control = 0, /* Allow tri-state control of UART tx flag */ 345 /* Irrelevant USB flags */ 346 .usb_auto_sleep = 0, 347 .usb_resume_timeout = 0, 348 .break_to_host = 0, 349 .pulsed_host_wake = 1, 350 }; 351 352 static int bcm_setup_sleep(struct hci_uart *hu) 353 { 354 struct bcm_data *bcm = hu->priv; 355 struct sk_buff *skb; 356 struct bcm_set_sleep_mode sleep_params = default_sleep_params; 357 358 sleep_params.host_wake_active = !bcm->dev->irq_active_low; 359 360 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params), 361 &sleep_params, HCI_INIT_TIMEOUT); 362 if (IS_ERR(skb)) { 363 int err = PTR_ERR(skb); 364 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err); 365 return err; 366 } 367 kfree_skb(skb); 368 369 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded"); 370 371 return 0; 372 } 373 #else 374 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; } 375 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; } 376 #endif 377 378 static int bcm_set_diag(struct hci_dev *hdev, bool enable) 379 { 380 struct hci_uart *hu = hci_get_drvdata(hdev); 381 struct bcm_data *bcm = hu->priv; 382 struct sk_buff *skb; 383 384 if (!test_bit(HCI_RUNNING, &hdev->flags)) 385 return -ENETDOWN; 386 387 skb = bt_skb_alloc(3, GFP_KERNEL); 388 if (!skb) 389 return -ENOMEM; 390 391 skb_put_u8(skb, BCM_LM_DIAG_PKT); 392 skb_put_u8(skb, 0xf0); 393 skb_put_u8(skb, enable); 394 395 skb_queue_tail(&bcm->txq, skb); 396 hci_uart_tx_wakeup(hu); 397 398 return 0; 399 } 400 401 static int bcm_open(struct hci_uart *hu) 402 { 403 struct bcm_data *bcm; 404 struct list_head *p; 405 int err; 406 407 bt_dev_dbg(hu->hdev, "hu %p", hu); 408 409 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); 410 if (!bcm) 411 return -ENOMEM; 412 413 skb_queue_head_init(&bcm->txq); 414 415 hu->priv = bcm; 416 417 mutex_lock(&bcm_device_lock); 418 419 if (hu->serdev) { 420 bcm->dev = serdev_device_get_drvdata(hu->serdev); 421 goto out; 422 } 423 424 if (!hu->tty->dev) 425 goto out; 426 427 list_for_each(p, &bcm_device_list) { 428 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 429 430 /* Retrieve saved bcm_device based on parent of the 431 * platform device (saved during device probe) and 432 * parent of tty device used by hci_uart 433 */ 434 if (hu->tty->dev->parent == dev->dev->parent) { 435 bcm->dev = dev; 436 #ifdef CONFIG_PM 437 dev->hu = hu; 438 #endif 439 break; 440 } 441 } 442 443 out: 444 if (bcm->dev) { 445 hu->init_speed = bcm->dev->init_speed; 446 hu->oper_speed = bcm->dev->oper_speed; 447 err = bcm_gpio_set_power(bcm->dev, true); 448 if (err) 449 goto err_unset_hu; 450 } 451 452 mutex_unlock(&bcm_device_lock); 453 return 0; 454 455 err_unset_hu: 456 #ifdef CONFIG_PM 457 if (!hu->serdev) 458 bcm->dev->hu = NULL; 459 #endif 460 mutex_unlock(&bcm_device_lock); 461 hu->priv = NULL; 462 kfree(bcm); 463 return err; 464 } 465 466 static int bcm_close(struct hci_uart *hu) 467 { 468 struct bcm_data *bcm = hu->priv; 469 struct bcm_device *bdev = NULL; 470 int err; 471 472 bt_dev_dbg(hu->hdev, "hu %p", hu); 473 474 /* Protect bcm->dev against removal of the device or driver */ 475 mutex_lock(&bcm_device_lock); 476 477 if (hu->serdev) { 478 bdev = serdev_device_get_drvdata(hu->serdev); 479 } else if (bcm_device_exists(bcm->dev)) { 480 bdev = bcm->dev; 481 #ifdef CONFIG_PM 482 bdev->hu = NULL; 483 #endif 484 } 485 486 if (bdev) { 487 if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) { 488 devm_free_irq(bdev->dev, bdev->irq, bdev); 489 device_init_wakeup(bdev->dev, false); 490 pm_runtime_disable(bdev->dev); 491 } 492 493 err = bcm_gpio_set_power(bdev, false); 494 if (err) 495 bt_dev_err(hu->hdev, "Failed to power down"); 496 else 497 pm_runtime_set_suspended(bdev->dev); 498 } 499 mutex_unlock(&bcm_device_lock); 500 501 skb_queue_purge(&bcm->txq); 502 kfree_skb(bcm->rx_skb); 503 kfree(bcm); 504 505 hu->priv = NULL; 506 return 0; 507 } 508 509 static int bcm_flush(struct hci_uart *hu) 510 { 511 struct bcm_data *bcm = hu->priv; 512 513 bt_dev_dbg(hu->hdev, "hu %p", hu); 514 515 skb_queue_purge(&bcm->txq); 516 517 return 0; 518 } 519 520 static int bcm_setup(struct hci_uart *hu) 521 { 522 struct bcm_data *bcm = hu->priv; 523 char fw_name[64]; 524 const struct firmware *fw; 525 unsigned int speed; 526 int err; 527 528 bt_dev_dbg(hu->hdev, "hu %p", hu); 529 530 hu->hdev->set_diag = bcm_set_diag; 531 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 532 533 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name), false); 534 if (err) 535 return err; 536 537 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 538 if (err < 0) { 539 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 540 return 0; 541 } 542 543 err = btbcm_patchram(hu->hdev, fw); 544 if (err) { 545 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 546 goto finalize; 547 } 548 549 /* Init speed if any */ 550 if (hu->init_speed) 551 speed = hu->init_speed; 552 else if (hu->proto->init_speed) 553 speed = hu->proto->init_speed; 554 else 555 speed = 0; 556 557 if (speed) 558 host_set_baudrate(hu, speed); 559 560 /* Operational speed if any */ 561 if (hu->oper_speed) 562 speed = hu->oper_speed; 563 else if (hu->proto->oper_speed) 564 speed = hu->proto->oper_speed; 565 else 566 speed = 0; 567 568 if (speed) { 569 err = bcm_set_baudrate(hu, speed); 570 if (!err) 571 host_set_baudrate(hu, speed); 572 } 573 574 finalize: 575 release_firmware(fw); 576 577 err = btbcm_finalize(hu->hdev); 578 if (err) 579 return err; 580 581 if (!bcm_request_irq(bcm)) 582 err = bcm_setup_sleep(hu); 583 584 return err; 585 } 586 587 #define BCM_RECV_LM_DIAG \ 588 .type = BCM_LM_DIAG_PKT, \ 589 .hlen = BCM_LM_DIAG_SIZE, \ 590 .loff = 0, \ 591 .lsize = 0, \ 592 .maxlen = BCM_LM_DIAG_SIZE 593 594 #define BCM_RECV_NULL \ 595 .type = BCM_NULL_PKT, \ 596 .hlen = BCM_NULL_SIZE, \ 597 .loff = 0, \ 598 .lsize = 0, \ 599 .maxlen = BCM_NULL_SIZE 600 601 #define BCM_RECV_TYPE49 \ 602 .type = BCM_TYPE49_PKT, \ 603 .hlen = BCM_TYPE49_SIZE, \ 604 .loff = 0, \ 605 .lsize = 0, \ 606 .maxlen = BCM_TYPE49_SIZE 607 608 #define BCM_RECV_TYPE52 \ 609 .type = BCM_TYPE52_PKT, \ 610 .hlen = BCM_TYPE52_SIZE, \ 611 .loff = 0, \ 612 .lsize = 0, \ 613 .maxlen = BCM_TYPE52_SIZE 614 615 static const struct h4_recv_pkt bcm_recv_pkts[] = { 616 { H4_RECV_ACL, .recv = hci_recv_frame }, 617 { H4_RECV_SCO, .recv = hci_recv_frame }, 618 { H4_RECV_EVENT, .recv = hci_recv_frame }, 619 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 620 { BCM_RECV_NULL, .recv = hci_recv_diag }, 621 { BCM_RECV_TYPE49, .recv = hci_recv_diag }, 622 { BCM_RECV_TYPE52, .recv = hci_recv_diag }, 623 }; 624 625 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 626 { 627 struct bcm_data *bcm = hu->priv; 628 629 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 630 return -EUNATCH; 631 632 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 633 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 634 if (IS_ERR(bcm->rx_skb)) { 635 int err = PTR_ERR(bcm->rx_skb); 636 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 637 bcm->rx_skb = NULL; 638 return err; 639 } else if (!bcm->rx_skb) { 640 /* Delay auto-suspend when receiving completed packet */ 641 mutex_lock(&bcm_device_lock); 642 if (bcm->dev && bcm_device_exists(bcm->dev)) { 643 pm_runtime_get(bcm->dev->dev); 644 pm_runtime_mark_last_busy(bcm->dev->dev); 645 pm_runtime_put_autosuspend(bcm->dev->dev); 646 } 647 mutex_unlock(&bcm_device_lock); 648 } 649 650 return count; 651 } 652 653 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 654 { 655 struct bcm_data *bcm = hu->priv; 656 657 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 658 659 /* Prepend skb with frame type */ 660 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 661 skb_queue_tail(&bcm->txq, skb); 662 663 return 0; 664 } 665 666 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 667 { 668 struct bcm_data *bcm = hu->priv; 669 struct sk_buff *skb = NULL; 670 struct bcm_device *bdev = NULL; 671 672 mutex_lock(&bcm_device_lock); 673 674 if (bcm_device_exists(bcm->dev)) { 675 bdev = bcm->dev; 676 pm_runtime_get_sync(bdev->dev); 677 /* Shall be resumed here */ 678 } 679 680 skb = skb_dequeue(&bcm->txq); 681 682 if (bdev) { 683 pm_runtime_mark_last_busy(bdev->dev); 684 pm_runtime_put_autosuspend(bdev->dev); 685 } 686 687 mutex_unlock(&bcm_device_lock); 688 689 return skb; 690 } 691 692 #ifdef CONFIG_PM 693 static int bcm_suspend_device(struct device *dev) 694 { 695 struct bcm_device *bdev = dev_get_drvdata(dev); 696 int err; 697 698 bt_dev_dbg(bdev, ""); 699 700 if (!bdev->is_suspended && bdev->hu) { 701 hci_uart_set_flow_control(bdev->hu, true); 702 703 /* Once this returns, driver suspends BT via GPIO */ 704 bdev->is_suspended = true; 705 } 706 707 /* Suspend the device */ 708 err = bdev->set_device_wakeup(bdev, false); 709 if (err) { 710 if (bdev->is_suspended && bdev->hu) { 711 bdev->is_suspended = false; 712 hci_uart_set_flow_control(bdev->hu, false); 713 } 714 return -EBUSY; 715 } 716 717 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 718 msleep(15); 719 720 return 0; 721 } 722 723 static int bcm_resume_device(struct device *dev) 724 { 725 struct bcm_device *bdev = dev_get_drvdata(dev); 726 int err; 727 728 bt_dev_dbg(bdev, ""); 729 730 err = bdev->set_device_wakeup(bdev, true); 731 if (err) { 732 dev_err(dev, "Failed to power up\n"); 733 return err; 734 } 735 736 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 737 msleep(15); 738 739 /* When this executes, the device has woken up already */ 740 if (bdev->is_suspended && bdev->hu) { 741 bdev->is_suspended = false; 742 743 hci_uart_set_flow_control(bdev->hu, false); 744 } 745 746 return 0; 747 } 748 #endif 749 750 #ifdef CONFIG_PM_SLEEP 751 /* suspend callback */ 752 static int bcm_suspend(struct device *dev) 753 { 754 struct bcm_device *bdev = dev_get_drvdata(dev); 755 int error; 756 757 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 758 759 /* 760 * When used with a device instantiated as platform_device, bcm_suspend 761 * can be called at any time as long as the platform device is bound, 762 * so it should use bcm_device_lock to protect access to hci_uart 763 * and device_wake-up GPIO. 764 */ 765 mutex_lock(&bcm_device_lock); 766 767 if (!bdev->hu) 768 goto unlock; 769 770 if (pm_runtime_active(dev)) 771 bcm_suspend_device(dev); 772 773 if (device_may_wakeup(dev) && bdev->irq > 0) { 774 error = enable_irq_wake(bdev->irq); 775 if (!error) 776 bt_dev_dbg(bdev, "BCM irq: enabled"); 777 } 778 779 unlock: 780 mutex_unlock(&bcm_device_lock); 781 782 return 0; 783 } 784 785 /* resume callback */ 786 static int bcm_resume(struct device *dev) 787 { 788 struct bcm_device *bdev = dev_get_drvdata(dev); 789 int err = 0; 790 791 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 792 793 /* 794 * When used with a device instantiated as platform_device, bcm_resume 795 * can be called at any time as long as platform device is bound, 796 * so it should use bcm_device_lock to protect access to hci_uart 797 * and device_wake-up GPIO. 798 */ 799 mutex_lock(&bcm_device_lock); 800 801 if (!bdev->hu) 802 goto unlock; 803 804 if (device_may_wakeup(dev) && bdev->irq > 0) { 805 disable_irq_wake(bdev->irq); 806 bt_dev_dbg(bdev, "BCM irq: disabled"); 807 } 808 809 err = bcm_resume_device(dev); 810 811 unlock: 812 mutex_unlock(&bcm_device_lock); 813 814 if (!err) { 815 pm_runtime_disable(dev); 816 pm_runtime_set_active(dev); 817 pm_runtime_enable(dev); 818 } 819 820 return 0; 821 } 822 #endif 823 824 static const struct acpi_gpio_params first_gpio = { 0, 0, false }; 825 static const struct acpi_gpio_params second_gpio = { 1, 0, false }; 826 static const struct acpi_gpio_params third_gpio = { 2, 0, false }; 827 828 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 829 { "device-wakeup-gpios", &first_gpio, 1 }, 830 { "shutdown-gpios", &second_gpio, 1 }, 831 { "host-wakeup-gpios", &third_gpio, 1 }, 832 { }, 833 }; 834 835 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 836 { "host-wakeup-gpios", &first_gpio, 1 }, 837 { "device-wakeup-gpios", &second_gpio, 1 }, 838 { "shutdown-gpios", &third_gpio, 1 }, 839 { }, 840 }; 841 842 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */ 843 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = { 844 { 845 .ident = "Meegopad T08", 846 .matches = { 847 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, 848 "To be filled by OEM."), 849 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"), 850 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"), 851 }, 852 }, 853 { } 854 }; 855 856 #ifdef CONFIG_ACPI 857 static int bcm_resource(struct acpi_resource *ares, void *data) 858 { 859 struct bcm_device *dev = data; 860 struct acpi_resource_extended_irq *irq; 861 struct acpi_resource_gpio *gpio; 862 struct acpi_resource_uart_serialbus *sb; 863 864 switch (ares->type) { 865 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 866 irq = &ares->data.extended_irq; 867 if (irq->polarity != ACPI_ACTIVE_LOW) 868 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n"); 869 dev->irq_active_low = true; 870 break; 871 872 case ACPI_RESOURCE_TYPE_GPIO: 873 gpio = &ares->data.gpio; 874 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) { 875 dev->gpio_int_idx = dev->gpio_count; 876 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW; 877 } 878 dev->gpio_count++; 879 break; 880 881 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 882 sb = &ares->data.uart_serial_bus; 883 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { 884 dev->init_speed = sb->default_baud_rate; 885 dev->oper_speed = 4000000; 886 } 887 break; 888 889 default: 890 break; 891 } 892 893 return 0; 894 } 895 896 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake) 897 { 898 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake))) 899 return -EIO; 900 901 return 0; 902 } 903 904 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered) 905 { 906 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd, 907 NULL, NULL, NULL))) 908 return -EIO; 909 910 return 0; 911 } 912 913 static int bcm_apple_get_resources(struct bcm_device *dev) 914 { 915 struct acpi_device *adev = ACPI_COMPANION(dev->dev); 916 const union acpi_object *obj; 917 918 if (!adev || 919 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) || 920 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) || 921 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd))) 922 return -ENODEV; 923 924 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) && 925 obj->buffer.length == 8) 926 dev->init_speed = *(u64 *)obj->buffer.pointer; 927 928 dev->set_device_wakeup = bcm_apple_set_device_wakeup; 929 dev->set_shutdown = bcm_apple_set_shutdown; 930 931 return 0; 932 } 933 #else 934 static inline int bcm_apple_get_resources(struct bcm_device *dev) 935 { 936 return -EOPNOTSUPP; 937 } 938 #endif /* CONFIG_ACPI */ 939 940 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake) 941 { 942 gpiod_set_value_cansleep(dev->device_wakeup, awake); 943 return 0; 944 } 945 946 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered) 947 { 948 gpiod_set_value_cansleep(dev->shutdown, powered); 949 return 0; 950 } 951 952 /* Try a bunch of names for TXCO */ 953 static struct clk *bcm_get_txco(struct device *dev) 954 { 955 struct clk *clk; 956 957 /* New explicit name */ 958 clk = devm_clk_get(dev, "txco"); 959 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 960 return clk; 961 962 /* Deprecated name */ 963 clk = devm_clk_get(dev, "extclk"); 964 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 965 return clk; 966 967 /* Original code used no name at all */ 968 return devm_clk_get(dev, NULL); 969 } 970 971 static int bcm_get_resources(struct bcm_device *dev) 972 { 973 const struct dmi_system_id *dmi_id; 974 int err; 975 976 dev->name = dev_name(dev->dev); 977 978 if (x86_apple_machine && !bcm_apple_get_resources(dev)) 979 return 0; 980 981 dev->txco_clk = bcm_get_txco(dev->dev); 982 983 /* Handle deferred probing */ 984 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER)) 985 return PTR_ERR(dev->txco_clk); 986 987 /* Ignore all other errors as before */ 988 if (IS_ERR(dev->txco_clk)) 989 dev->txco_clk = NULL; 990 991 dev->lpo_clk = devm_clk_get(dev->dev, "lpo"); 992 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER)) 993 return PTR_ERR(dev->lpo_clk); 994 995 if (IS_ERR(dev->lpo_clk)) 996 dev->lpo_clk = NULL; 997 998 /* Check if we accidentally fetched the lpo clock twice */ 999 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) { 1000 devm_clk_put(dev->dev, dev->txco_clk); 1001 dev->txco_clk = NULL; 1002 } 1003 1004 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup", 1005 GPIOD_OUT_LOW); 1006 if (IS_ERR(dev->device_wakeup)) 1007 return PTR_ERR(dev->device_wakeup); 1008 1009 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown", 1010 GPIOD_OUT_LOW); 1011 if (IS_ERR(dev->shutdown)) 1012 return PTR_ERR(dev->shutdown); 1013 1014 dev->set_device_wakeup = bcm_gpio_set_device_wakeup; 1015 dev->set_shutdown = bcm_gpio_set_shutdown; 1016 1017 dev->supplies[0].supply = "vbat"; 1018 dev->supplies[1].supply = "vddio"; 1019 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES, 1020 dev->supplies); 1021 if (err) 1022 return err; 1023 1024 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 1025 if (dev->irq <= 0) { 1026 struct gpio_desc *gpio; 1027 1028 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup", 1029 GPIOD_IN); 1030 if (IS_ERR(gpio)) 1031 return PTR_ERR(gpio); 1032 1033 dev->irq = gpiod_to_irq(gpio); 1034 } 1035 1036 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table); 1037 if (dmi_id) { 1038 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n", 1039 dmi_id->ident); 1040 dev->irq = 0; 1041 } 1042 1043 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq); 1044 return 0; 1045 } 1046 1047 #ifdef CONFIG_ACPI 1048 static int bcm_acpi_probe(struct bcm_device *dev) 1049 { 1050 LIST_HEAD(resources); 1051 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; 1052 struct resource_entry *entry; 1053 int ret; 1054 1055 /* Retrieve UART ACPI info */ 1056 dev->gpio_int_idx = -1; 1057 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev), 1058 &resources, bcm_resource, dev); 1059 if (ret < 0) 1060 return ret; 1061 1062 resource_list_for_each_entry(entry, &resources) { 1063 if (resource_type(entry->res) == IORESOURCE_IRQ) { 1064 dev->irq = entry->res->start; 1065 break; 1066 } 1067 } 1068 acpi_dev_free_resource_list(&resources); 1069 1070 /* If the DSDT uses an Interrupt resource for the IRQ, then there are 1071 * only 2 GPIO resources, we use the irq-last mapping for this, since 1072 * we already have an irq the 3th / last mapping will not be used. 1073 */ 1074 if (dev->irq) 1075 gpio_mapping = acpi_bcm_int_last_gpios; 1076 else if (dev->gpio_int_idx == 0) 1077 gpio_mapping = acpi_bcm_int_first_gpios; 1078 else if (dev->gpio_int_idx == 2) 1079 gpio_mapping = acpi_bcm_int_last_gpios; 1080 else 1081 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n", 1082 dev->gpio_int_idx); 1083 1084 /* Warn if our expectations are not met. */ 1085 if (dev->gpio_count != (dev->irq ? 2 : 3)) 1086 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n", 1087 dev->gpio_count); 1088 1089 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping); 1090 if (ret) 1091 return ret; 1092 1093 if (irq_polarity != -1) { 1094 dev->irq_active_low = irq_polarity; 1095 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n", 1096 dev->irq_active_low ? "low" : "high"); 1097 } 1098 1099 return 0; 1100 } 1101 #else 1102 static int bcm_acpi_probe(struct bcm_device *dev) 1103 { 1104 return -EINVAL; 1105 } 1106 #endif /* CONFIG_ACPI */ 1107 1108 static int bcm_of_probe(struct bcm_device *bdev) 1109 { 1110 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed); 1111 return 0; 1112 } 1113 1114 static int bcm_probe(struct platform_device *pdev) 1115 { 1116 struct bcm_device *dev; 1117 int ret; 1118 1119 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 1120 if (!dev) 1121 return -ENOMEM; 1122 1123 dev->dev = &pdev->dev; 1124 dev->irq = platform_get_irq(pdev, 0); 1125 1126 if (has_acpi_companion(&pdev->dev)) { 1127 ret = bcm_acpi_probe(dev); 1128 if (ret) 1129 return ret; 1130 } 1131 1132 ret = bcm_get_resources(dev); 1133 if (ret) 1134 return ret; 1135 1136 platform_set_drvdata(pdev, dev); 1137 1138 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 1139 1140 /* Place this instance on the device list */ 1141 mutex_lock(&bcm_device_lock); 1142 list_add_tail(&dev->list, &bcm_device_list); 1143 mutex_unlock(&bcm_device_lock); 1144 1145 ret = bcm_gpio_set_power(dev, false); 1146 if (ret) 1147 dev_err(&pdev->dev, "Failed to power down\n"); 1148 1149 return 0; 1150 } 1151 1152 static int bcm_remove(struct platform_device *pdev) 1153 { 1154 struct bcm_device *dev = platform_get_drvdata(pdev); 1155 1156 mutex_lock(&bcm_device_lock); 1157 list_del(&dev->list); 1158 mutex_unlock(&bcm_device_lock); 1159 1160 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 1161 1162 return 0; 1163 } 1164 1165 static const struct hci_uart_proto bcm_proto = { 1166 .id = HCI_UART_BCM, 1167 .name = "Broadcom", 1168 .manufacturer = 15, 1169 .init_speed = 115200, 1170 .open = bcm_open, 1171 .close = bcm_close, 1172 .flush = bcm_flush, 1173 .setup = bcm_setup, 1174 .set_baudrate = bcm_set_baudrate, 1175 .recv = bcm_recv, 1176 .enqueue = bcm_enqueue, 1177 .dequeue = bcm_dequeue, 1178 }; 1179 1180 #ifdef CONFIG_ACPI 1181 static const struct acpi_device_id bcm_acpi_match[] = { 1182 { "BCM2E00" }, 1183 { "BCM2E01" }, 1184 { "BCM2E02" }, 1185 { "BCM2E03" }, 1186 { "BCM2E04" }, 1187 { "BCM2E05" }, 1188 { "BCM2E06" }, 1189 { "BCM2E07" }, 1190 { "BCM2E08" }, 1191 { "BCM2E09" }, 1192 { "BCM2E0A" }, 1193 { "BCM2E0B" }, 1194 { "BCM2E0C" }, 1195 { "BCM2E0D" }, 1196 { "BCM2E0E" }, 1197 { "BCM2E0F" }, 1198 { "BCM2E10" }, 1199 { "BCM2E11" }, 1200 { "BCM2E12" }, 1201 { "BCM2E13" }, 1202 { "BCM2E14" }, 1203 { "BCM2E15" }, 1204 { "BCM2E16" }, 1205 { "BCM2E17" }, 1206 { "BCM2E18" }, 1207 { "BCM2E19" }, 1208 { "BCM2E1A" }, 1209 { "BCM2E1B" }, 1210 { "BCM2E1C" }, 1211 { "BCM2E1D" }, 1212 { "BCM2E1F" }, 1213 { "BCM2E20" }, 1214 { "BCM2E21" }, 1215 { "BCM2E22" }, 1216 { "BCM2E23" }, 1217 { "BCM2E24" }, 1218 { "BCM2E25" }, 1219 { "BCM2E26" }, 1220 { "BCM2E27" }, 1221 { "BCM2E28" }, 1222 { "BCM2E29" }, 1223 { "BCM2E2A" }, 1224 { "BCM2E2B" }, 1225 { "BCM2E2C" }, 1226 { "BCM2E2D" }, 1227 { "BCM2E2E" }, 1228 { "BCM2E2F" }, 1229 { "BCM2E30" }, 1230 { "BCM2E31" }, 1231 { "BCM2E32" }, 1232 { "BCM2E33" }, 1233 { "BCM2E34" }, 1234 { "BCM2E35" }, 1235 { "BCM2E36" }, 1236 { "BCM2E37" }, 1237 { "BCM2E38" }, 1238 { "BCM2E39" }, 1239 { "BCM2E3A" }, 1240 { "BCM2E3B" }, 1241 { "BCM2E3C" }, 1242 { "BCM2E3D" }, 1243 { "BCM2E3E" }, 1244 { "BCM2E3F" }, 1245 { "BCM2E40" }, 1246 { "BCM2E41" }, 1247 { "BCM2E42" }, 1248 { "BCM2E43" }, 1249 { "BCM2E44" }, 1250 { "BCM2E45" }, 1251 { "BCM2E46" }, 1252 { "BCM2E47" }, 1253 { "BCM2E48" }, 1254 { "BCM2E49" }, 1255 { "BCM2E4A" }, 1256 { "BCM2E4B" }, 1257 { "BCM2E4C" }, 1258 { "BCM2E4D" }, 1259 { "BCM2E4E" }, 1260 { "BCM2E4F" }, 1261 { "BCM2E50" }, 1262 { "BCM2E51" }, 1263 { "BCM2E52" }, 1264 { "BCM2E53" }, 1265 { "BCM2E54" }, 1266 { "BCM2E55" }, 1267 { "BCM2E56" }, 1268 { "BCM2E57" }, 1269 { "BCM2E58" }, 1270 { "BCM2E59" }, 1271 { "BCM2E5A" }, 1272 { "BCM2E5B" }, 1273 { "BCM2E5C" }, 1274 { "BCM2E5D" }, 1275 { "BCM2E5E" }, 1276 { "BCM2E5F" }, 1277 { "BCM2E60" }, 1278 { "BCM2E61" }, 1279 { "BCM2E62" }, 1280 { "BCM2E63" }, 1281 { "BCM2E64" }, 1282 { "BCM2E65" }, 1283 { "BCM2E66" }, 1284 { "BCM2E67" }, 1285 { "BCM2E68" }, 1286 { "BCM2E69" }, 1287 { "BCM2E6B" }, 1288 { "BCM2E6D" }, 1289 { "BCM2E6E" }, 1290 { "BCM2E6F" }, 1291 { "BCM2E70" }, 1292 { "BCM2E71" }, 1293 { "BCM2E72" }, 1294 { "BCM2E73" }, 1295 { "BCM2E74" }, 1296 { "BCM2E75" }, 1297 { "BCM2E76" }, 1298 { "BCM2E77" }, 1299 { "BCM2E78" }, 1300 { "BCM2E79" }, 1301 { "BCM2E7A" }, 1302 { "BCM2E7B" }, 1303 { "BCM2E7C" }, 1304 { "BCM2E7D" }, 1305 { "BCM2E7E" }, 1306 { "BCM2E7F" }, 1307 { "BCM2E80" }, 1308 { "BCM2E81" }, 1309 { "BCM2E82" }, 1310 { "BCM2E83" }, 1311 { "BCM2E84" }, 1312 { "BCM2E85" }, 1313 { "BCM2E86" }, 1314 { "BCM2E87" }, 1315 { "BCM2E88" }, 1316 { "BCM2E89" }, 1317 { "BCM2E8A" }, 1318 { "BCM2E8B" }, 1319 { "BCM2E8C" }, 1320 { "BCM2E8D" }, 1321 { "BCM2E8E" }, 1322 { "BCM2E90" }, 1323 { "BCM2E92" }, 1324 { "BCM2E93" }, 1325 { "BCM2E94" }, 1326 { "BCM2E95" }, 1327 { "BCM2E96" }, 1328 { "BCM2E97" }, 1329 { "BCM2E98" }, 1330 { "BCM2E99" }, 1331 { "BCM2E9A" }, 1332 { "BCM2E9B" }, 1333 { "BCM2E9C" }, 1334 { "BCM2E9D" }, 1335 { "BCM2EA0" }, 1336 { "BCM2EA1" }, 1337 { "BCM2EA2" }, 1338 { "BCM2EA3" }, 1339 { "BCM2EA4" }, 1340 { "BCM2EA5" }, 1341 { "BCM2EA6" }, 1342 { "BCM2EA7" }, 1343 { "BCM2EA8" }, 1344 { "BCM2EA9" }, 1345 { "BCM2EAA" }, 1346 { "BCM2EAB" }, 1347 { "BCM2EAC" }, 1348 { }, 1349 }; 1350 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 1351 #endif 1352 1353 /* suspend and resume callbacks */ 1354 static const struct dev_pm_ops bcm_pm_ops = { 1355 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 1356 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 1357 }; 1358 1359 static struct platform_driver bcm_driver = { 1360 .probe = bcm_probe, 1361 .remove = bcm_remove, 1362 .driver = { 1363 .name = "hci_bcm", 1364 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1365 .pm = &bcm_pm_ops, 1366 }, 1367 }; 1368 1369 static int bcm_serdev_probe(struct serdev_device *serdev) 1370 { 1371 struct bcm_device *bcmdev; 1372 int err; 1373 1374 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL); 1375 if (!bcmdev) 1376 return -ENOMEM; 1377 1378 bcmdev->dev = &serdev->dev; 1379 #ifdef CONFIG_PM 1380 bcmdev->hu = &bcmdev->serdev_hu; 1381 #endif 1382 bcmdev->serdev_hu.serdev = serdev; 1383 serdev_device_set_drvdata(serdev, bcmdev); 1384 1385 if (has_acpi_companion(&serdev->dev)) 1386 err = bcm_acpi_probe(bcmdev); 1387 else 1388 err = bcm_of_probe(bcmdev); 1389 if (err) 1390 return err; 1391 1392 err = bcm_get_resources(bcmdev); 1393 if (err) 1394 return err; 1395 1396 if (!bcmdev->shutdown) { 1397 dev_warn(&serdev->dev, 1398 "No reset resource, using default baud rate\n"); 1399 bcmdev->oper_speed = bcmdev->init_speed; 1400 } 1401 1402 err = bcm_gpio_set_power(bcmdev, false); 1403 if (err) 1404 dev_err(&serdev->dev, "Failed to power down\n"); 1405 1406 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto); 1407 } 1408 1409 static void bcm_serdev_remove(struct serdev_device *serdev) 1410 { 1411 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev); 1412 1413 hci_uart_unregister_device(&bcmdev->serdev_hu); 1414 } 1415 1416 #ifdef CONFIG_OF 1417 static const struct of_device_id bcm_bluetooth_of_match[] = { 1418 { .compatible = "brcm,bcm20702a1" }, 1419 { .compatible = "brcm,bcm4330-bt" }, 1420 { .compatible = "brcm,bcm43438-bt" }, 1421 { }, 1422 }; 1423 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match); 1424 #endif 1425 1426 static struct serdev_device_driver bcm_serdev_driver = { 1427 .probe = bcm_serdev_probe, 1428 .remove = bcm_serdev_remove, 1429 .driver = { 1430 .name = "hci_uart_bcm", 1431 .of_match_table = of_match_ptr(bcm_bluetooth_of_match), 1432 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1433 .pm = &bcm_pm_ops, 1434 }, 1435 }; 1436 1437 int __init bcm_init(void) 1438 { 1439 /* For now, we need to keep both platform device 1440 * driver (ACPI generated) and serdev driver (DT). 1441 */ 1442 platform_driver_register(&bcm_driver); 1443 serdev_device_driver_register(&bcm_serdev_driver); 1444 1445 return hci_uart_register_proto(&bcm_proto); 1446 } 1447 1448 int __exit bcm_deinit(void) 1449 { 1450 platform_driver_unregister(&bcm_driver); 1451 serdev_device_driver_unregister(&bcm_serdev_driver); 1452 1453 return hci_uart_unregister_proto(&bcm_proto); 1454 } 1455