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(100000, 120000); 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 if (!hci_uart_has_flow_control(hu)) 410 return -EOPNOTSUPP; 411 412 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); 413 if (!bcm) 414 return -ENOMEM; 415 416 skb_queue_head_init(&bcm->txq); 417 418 hu->priv = bcm; 419 420 mutex_lock(&bcm_device_lock); 421 422 if (hu->serdev) { 423 bcm->dev = serdev_device_get_drvdata(hu->serdev); 424 goto out; 425 } 426 427 if (!hu->tty->dev) 428 goto out; 429 430 list_for_each(p, &bcm_device_list) { 431 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 432 433 /* Retrieve saved bcm_device based on parent of the 434 * platform device (saved during device probe) and 435 * parent of tty device used by hci_uart 436 */ 437 if (hu->tty->dev->parent == dev->dev->parent) { 438 bcm->dev = dev; 439 #ifdef CONFIG_PM 440 dev->hu = hu; 441 #endif 442 break; 443 } 444 } 445 446 out: 447 if (bcm->dev) { 448 hu->init_speed = bcm->dev->init_speed; 449 hu->oper_speed = bcm->dev->oper_speed; 450 err = bcm_gpio_set_power(bcm->dev, true); 451 if (err) 452 goto err_unset_hu; 453 } 454 455 mutex_unlock(&bcm_device_lock); 456 return 0; 457 458 err_unset_hu: 459 #ifdef CONFIG_PM 460 if (!hu->serdev) 461 bcm->dev->hu = NULL; 462 #endif 463 mutex_unlock(&bcm_device_lock); 464 hu->priv = NULL; 465 kfree(bcm); 466 return err; 467 } 468 469 static int bcm_close(struct hci_uart *hu) 470 { 471 struct bcm_data *bcm = hu->priv; 472 struct bcm_device *bdev = NULL; 473 int err; 474 475 bt_dev_dbg(hu->hdev, "hu %p", hu); 476 477 /* Protect bcm->dev against removal of the device or driver */ 478 mutex_lock(&bcm_device_lock); 479 480 if (hu->serdev) { 481 bdev = serdev_device_get_drvdata(hu->serdev); 482 } else if (bcm_device_exists(bcm->dev)) { 483 bdev = bcm->dev; 484 #ifdef CONFIG_PM 485 bdev->hu = NULL; 486 #endif 487 } 488 489 if (bdev) { 490 if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) { 491 devm_free_irq(bdev->dev, bdev->irq, bdev); 492 device_init_wakeup(bdev->dev, false); 493 pm_runtime_disable(bdev->dev); 494 } 495 496 err = bcm_gpio_set_power(bdev, false); 497 if (err) 498 bt_dev_err(hu->hdev, "Failed to power down"); 499 else 500 pm_runtime_set_suspended(bdev->dev); 501 } 502 mutex_unlock(&bcm_device_lock); 503 504 skb_queue_purge(&bcm->txq); 505 kfree_skb(bcm->rx_skb); 506 kfree(bcm); 507 508 hu->priv = NULL; 509 return 0; 510 } 511 512 static int bcm_flush(struct hci_uart *hu) 513 { 514 struct bcm_data *bcm = hu->priv; 515 516 bt_dev_dbg(hu->hdev, "hu %p", hu); 517 518 skb_queue_purge(&bcm->txq); 519 520 return 0; 521 } 522 523 static int bcm_setup(struct hci_uart *hu) 524 { 525 struct bcm_data *bcm = hu->priv; 526 char fw_name[64]; 527 const struct firmware *fw; 528 unsigned int speed; 529 int err; 530 531 bt_dev_dbg(hu->hdev, "hu %p", hu); 532 533 hu->hdev->set_diag = bcm_set_diag; 534 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 535 536 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name), false); 537 if (err) 538 return err; 539 540 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 541 if (err < 0) { 542 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 543 return 0; 544 } 545 546 err = btbcm_patchram(hu->hdev, fw); 547 if (err) { 548 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 549 goto finalize; 550 } 551 552 /* Init speed if any */ 553 if (hu->init_speed) 554 speed = hu->init_speed; 555 else if (hu->proto->init_speed) 556 speed = hu->proto->init_speed; 557 else 558 speed = 0; 559 560 if (speed) 561 host_set_baudrate(hu, speed); 562 563 /* Operational speed if any */ 564 if (hu->oper_speed) 565 speed = hu->oper_speed; 566 else if (hu->proto->oper_speed) 567 speed = hu->proto->oper_speed; 568 else 569 speed = 0; 570 571 if (speed) { 572 err = bcm_set_baudrate(hu, speed); 573 if (!err) 574 host_set_baudrate(hu, speed); 575 } 576 577 finalize: 578 release_firmware(fw); 579 580 err = btbcm_finalize(hu->hdev); 581 if (err) 582 return err; 583 584 if (!bcm_request_irq(bcm)) 585 err = bcm_setup_sleep(hu); 586 587 return err; 588 } 589 590 #define BCM_RECV_LM_DIAG \ 591 .type = BCM_LM_DIAG_PKT, \ 592 .hlen = BCM_LM_DIAG_SIZE, \ 593 .loff = 0, \ 594 .lsize = 0, \ 595 .maxlen = BCM_LM_DIAG_SIZE 596 597 #define BCM_RECV_NULL \ 598 .type = BCM_NULL_PKT, \ 599 .hlen = BCM_NULL_SIZE, \ 600 .loff = 0, \ 601 .lsize = 0, \ 602 .maxlen = BCM_NULL_SIZE 603 604 #define BCM_RECV_TYPE49 \ 605 .type = BCM_TYPE49_PKT, \ 606 .hlen = BCM_TYPE49_SIZE, \ 607 .loff = 0, \ 608 .lsize = 0, \ 609 .maxlen = BCM_TYPE49_SIZE 610 611 #define BCM_RECV_TYPE52 \ 612 .type = BCM_TYPE52_PKT, \ 613 .hlen = BCM_TYPE52_SIZE, \ 614 .loff = 0, \ 615 .lsize = 0, \ 616 .maxlen = BCM_TYPE52_SIZE 617 618 static const struct h4_recv_pkt bcm_recv_pkts[] = { 619 { H4_RECV_ACL, .recv = hci_recv_frame }, 620 { H4_RECV_SCO, .recv = hci_recv_frame }, 621 { H4_RECV_EVENT, .recv = hci_recv_frame }, 622 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 623 { BCM_RECV_NULL, .recv = hci_recv_diag }, 624 { BCM_RECV_TYPE49, .recv = hci_recv_diag }, 625 { BCM_RECV_TYPE52, .recv = hci_recv_diag }, 626 }; 627 628 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 629 { 630 struct bcm_data *bcm = hu->priv; 631 632 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 633 return -EUNATCH; 634 635 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 636 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 637 if (IS_ERR(bcm->rx_skb)) { 638 int err = PTR_ERR(bcm->rx_skb); 639 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 640 bcm->rx_skb = NULL; 641 return err; 642 } else if (!bcm->rx_skb) { 643 /* Delay auto-suspend when receiving completed packet */ 644 mutex_lock(&bcm_device_lock); 645 if (bcm->dev && bcm_device_exists(bcm->dev)) { 646 pm_runtime_get(bcm->dev->dev); 647 pm_runtime_mark_last_busy(bcm->dev->dev); 648 pm_runtime_put_autosuspend(bcm->dev->dev); 649 } 650 mutex_unlock(&bcm_device_lock); 651 } 652 653 return count; 654 } 655 656 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 657 { 658 struct bcm_data *bcm = hu->priv; 659 660 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 661 662 /* Prepend skb with frame type */ 663 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 664 skb_queue_tail(&bcm->txq, skb); 665 666 return 0; 667 } 668 669 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 670 { 671 struct bcm_data *bcm = hu->priv; 672 struct sk_buff *skb = NULL; 673 struct bcm_device *bdev = NULL; 674 675 mutex_lock(&bcm_device_lock); 676 677 if (bcm_device_exists(bcm->dev)) { 678 bdev = bcm->dev; 679 pm_runtime_get_sync(bdev->dev); 680 /* Shall be resumed here */ 681 } 682 683 skb = skb_dequeue(&bcm->txq); 684 685 if (bdev) { 686 pm_runtime_mark_last_busy(bdev->dev); 687 pm_runtime_put_autosuspend(bdev->dev); 688 } 689 690 mutex_unlock(&bcm_device_lock); 691 692 return skb; 693 } 694 695 #ifdef CONFIG_PM 696 static int bcm_suspend_device(struct device *dev) 697 { 698 struct bcm_device *bdev = dev_get_drvdata(dev); 699 int err; 700 701 bt_dev_dbg(bdev, ""); 702 703 if (!bdev->is_suspended && bdev->hu) { 704 hci_uart_set_flow_control(bdev->hu, true); 705 706 /* Once this returns, driver suspends BT via GPIO */ 707 bdev->is_suspended = true; 708 } 709 710 /* Suspend the device */ 711 err = bdev->set_device_wakeup(bdev, false); 712 if (err) { 713 if (bdev->is_suspended && bdev->hu) { 714 bdev->is_suspended = false; 715 hci_uart_set_flow_control(bdev->hu, false); 716 } 717 return -EBUSY; 718 } 719 720 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 721 msleep(15); 722 723 return 0; 724 } 725 726 static int bcm_resume_device(struct device *dev) 727 { 728 struct bcm_device *bdev = dev_get_drvdata(dev); 729 int err; 730 731 bt_dev_dbg(bdev, ""); 732 733 err = bdev->set_device_wakeup(bdev, true); 734 if (err) { 735 dev_err(dev, "Failed to power up\n"); 736 return err; 737 } 738 739 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 740 msleep(15); 741 742 /* When this executes, the device has woken up already */ 743 if (bdev->is_suspended && bdev->hu) { 744 bdev->is_suspended = false; 745 746 hci_uart_set_flow_control(bdev->hu, false); 747 } 748 749 return 0; 750 } 751 #endif 752 753 #ifdef CONFIG_PM_SLEEP 754 /* suspend callback */ 755 static int bcm_suspend(struct device *dev) 756 { 757 struct bcm_device *bdev = dev_get_drvdata(dev); 758 int error; 759 760 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 761 762 /* 763 * When used with a device instantiated as platform_device, bcm_suspend 764 * can be called at any time as long as the platform device is bound, 765 * so it should use bcm_device_lock to protect access to hci_uart 766 * and device_wake-up GPIO. 767 */ 768 mutex_lock(&bcm_device_lock); 769 770 if (!bdev->hu) 771 goto unlock; 772 773 if (pm_runtime_active(dev)) 774 bcm_suspend_device(dev); 775 776 if (device_may_wakeup(dev) && bdev->irq > 0) { 777 error = enable_irq_wake(bdev->irq); 778 if (!error) 779 bt_dev_dbg(bdev, "BCM irq: enabled"); 780 } 781 782 unlock: 783 mutex_unlock(&bcm_device_lock); 784 785 return 0; 786 } 787 788 /* resume callback */ 789 static int bcm_resume(struct device *dev) 790 { 791 struct bcm_device *bdev = dev_get_drvdata(dev); 792 int err = 0; 793 794 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 795 796 /* 797 * When used with a device instantiated as platform_device, bcm_resume 798 * can be called at any time as long as platform device is bound, 799 * so it should use bcm_device_lock to protect access to hci_uart 800 * and device_wake-up GPIO. 801 */ 802 mutex_lock(&bcm_device_lock); 803 804 if (!bdev->hu) 805 goto unlock; 806 807 if (device_may_wakeup(dev) && bdev->irq > 0) { 808 disable_irq_wake(bdev->irq); 809 bt_dev_dbg(bdev, "BCM irq: disabled"); 810 } 811 812 err = bcm_resume_device(dev); 813 814 unlock: 815 mutex_unlock(&bcm_device_lock); 816 817 if (!err) { 818 pm_runtime_disable(dev); 819 pm_runtime_set_active(dev); 820 pm_runtime_enable(dev); 821 } 822 823 return 0; 824 } 825 #endif 826 827 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */ 828 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = { 829 { 830 .ident = "Meegopad T08", 831 .matches = { 832 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, 833 "To be filled by OEM."), 834 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"), 835 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"), 836 }, 837 }, 838 { } 839 }; 840 841 #ifdef CONFIG_ACPI 842 static const struct acpi_gpio_params first_gpio = { 0, 0, false }; 843 static const struct acpi_gpio_params second_gpio = { 1, 0, false }; 844 static const struct acpi_gpio_params third_gpio = { 2, 0, false }; 845 846 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 847 { "device-wakeup-gpios", &first_gpio, 1 }, 848 { "shutdown-gpios", &second_gpio, 1 }, 849 { "host-wakeup-gpios", &third_gpio, 1 }, 850 { }, 851 }; 852 853 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 854 { "host-wakeup-gpios", &first_gpio, 1 }, 855 { "device-wakeup-gpios", &second_gpio, 1 }, 856 { "shutdown-gpios", &third_gpio, 1 }, 857 { }, 858 }; 859 860 static int bcm_resource(struct acpi_resource *ares, void *data) 861 { 862 struct bcm_device *dev = data; 863 struct acpi_resource_extended_irq *irq; 864 struct acpi_resource_gpio *gpio; 865 struct acpi_resource_uart_serialbus *sb; 866 867 switch (ares->type) { 868 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 869 irq = &ares->data.extended_irq; 870 if (irq->polarity != ACPI_ACTIVE_LOW) 871 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n"); 872 dev->irq_active_low = true; 873 break; 874 875 case ACPI_RESOURCE_TYPE_GPIO: 876 gpio = &ares->data.gpio; 877 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) { 878 dev->gpio_int_idx = dev->gpio_count; 879 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW; 880 } 881 dev->gpio_count++; 882 break; 883 884 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 885 sb = &ares->data.uart_serial_bus; 886 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { 887 dev->init_speed = sb->default_baud_rate; 888 dev->oper_speed = 4000000; 889 } 890 break; 891 892 default: 893 break; 894 } 895 896 return 0; 897 } 898 899 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake) 900 { 901 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake))) 902 return -EIO; 903 904 return 0; 905 } 906 907 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered) 908 { 909 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd, 910 NULL, NULL, NULL))) 911 return -EIO; 912 913 return 0; 914 } 915 916 static int bcm_apple_get_resources(struct bcm_device *dev) 917 { 918 struct acpi_device *adev = ACPI_COMPANION(dev->dev); 919 const union acpi_object *obj; 920 921 if (!adev || 922 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) || 923 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) || 924 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd))) 925 return -ENODEV; 926 927 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) && 928 obj->buffer.length == 8) 929 dev->init_speed = *(u64 *)obj->buffer.pointer; 930 931 dev->set_device_wakeup = bcm_apple_set_device_wakeup; 932 dev->set_shutdown = bcm_apple_set_shutdown; 933 934 return 0; 935 } 936 #else 937 static inline int bcm_apple_get_resources(struct bcm_device *dev) 938 { 939 return -EOPNOTSUPP; 940 } 941 #endif /* CONFIG_ACPI */ 942 943 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake) 944 { 945 gpiod_set_value_cansleep(dev->device_wakeup, awake); 946 return 0; 947 } 948 949 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered) 950 { 951 gpiod_set_value_cansleep(dev->shutdown, powered); 952 return 0; 953 } 954 955 /* Try a bunch of names for TXCO */ 956 static struct clk *bcm_get_txco(struct device *dev) 957 { 958 struct clk *clk; 959 960 /* New explicit name */ 961 clk = devm_clk_get(dev, "txco"); 962 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 963 return clk; 964 965 /* Deprecated name */ 966 clk = devm_clk_get(dev, "extclk"); 967 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 968 return clk; 969 970 /* Original code used no name at all */ 971 return devm_clk_get(dev, NULL); 972 } 973 974 static int bcm_get_resources(struct bcm_device *dev) 975 { 976 const struct dmi_system_id *dmi_id; 977 int err; 978 979 dev->name = dev_name(dev->dev); 980 981 if (x86_apple_machine && !bcm_apple_get_resources(dev)) 982 return 0; 983 984 dev->txco_clk = bcm_get_txco(dev->dev); 985 986 /* Handle deferred probing */ 987 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER)) 988 return PTR_ERR(dev->txco_clk); 989 990 /* Ignore all other errors as before */ 991 if (IS_ERR(dev->txco_clk)) 992 dev->txco_clk = NULL; 993 994 dev->lpo_clk = devm_clk_get(dev->dev, "lpo"); 995 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER)) 996 return PTR_ERR(dev->lpo_clk); 997 998 if (IS_ERR(dev->lpo_clk)) 999 dev->lpo_clk = NULL; 1000 1001 /* Check if we accidentally fetched the lpo clock twice */ 1002 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) { 1003 devm_clk_put(dev->dev, dev->txco_clk); 1004 dev->txco_clk = NULL; 1005 } 1006 1007 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup", 1008 GPIOD_OUT_LOW); 1009 if (IS_ERR(dev->device_wakeup)) 1010 return PTR_ERR(dev->device_wakeup); 1011 1012 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown", 1013 GPIOD_OUT_LOW); 1014 if (IS_ERR(dev->shutdown)) 1015 return PTR_ERR(dev->shutdown); 1016 1017 dev->set_device_wakeup = bcm_gpio_set_device_wakeup; 1018 dev->set_shutdown = bcm_gpio_set_shutdown; 1019 1020 dev->supplies[0].supply = "vbat"; 1021 dev->supplies[1].supply = "vddio"; 1022 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES, 1023 dev->supplies); 1024 if (err) 1025 return err; 1026 1027 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 1028 if (dev->irq <= 0) { 1029 struct gpio_desc *gpio; 1030 1031 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup", 1032 GPIOD_IN); 1033 if (IS_ERR(gpio)) 1034 return PTR_ERR(gpio); 1035 1036 dev->irq = gpiod_to_irq(gpio); 1037 } 1038 1039 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table); 1040 if (dmi_id) { 1041 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n", 1042 dmi_id->ident); 1043 dev->irq = 0; 1044 } 1045 1046 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq); 1047 return 0; 1048 } 1049 1050 #ifdef CONFIG_ACPI 1051 static int bcm_acpi_probe(struct bcm_device *dev) 1052 { 1053 LIST_HEAD(resources); 1054 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; 1055 struct resource_entry *entry; 1056 int ret; 1057 1058 /* Retrieve UART ACPI info */ 1059 dev->gpio_int_idx = -1; 1060 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev), 1061 &resources, bcm_resource, dev); 1062 if (ret < 0) 1063 return ret; 1064 1065 resource_list_for_each_entry(entry, &resources) { 1066 if (resource_type(entry->res) == IORESOURCE_IRQ) { 1067 dev->irq = entry->res->start; 1068 break; 1069 } 1070 } 1071 acpi_dev_free_resource_list(&resources); 1072 1073 /* If the DSDT uses an Interrupt resource for the IRQ, then there are 1074 * only 2 GPIO resources, we use the irq-last mapping for this, since 1075 * we already have an irq the 3th / last mapping will not be used. 1076 */ 1077 if (dev->irq) 1078 gpio_mapping = acpi_bcm_int_last_gpios; 1079 else if (dev->gpio_int_idx == 0) 1080 gpio_mapping = acpi_bcm_int_first_gpios; 1081 else if (dev->gpio_int_idx == 2) 1082 gpio_mapping = acpi_bcm_int_last_gpios; 1083 else 1084 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n", 1085 dev->gpio_int_idx); 1086 1087 /* Warn if our expectations are not met. */ 1088 if (dev->gpio_count != (dev->irq ? 2 : 3)) 1089 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n", 1090 dev->gpio_count); 1091 1092 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping); 1093 if (ret) 1094 return ret; 1095 1096 if (irq_polarity != -1) { 1097 dev->irq_active_low = irq_polarity; 1098 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n", 1099 dev->irq_active_low ? "low" : "high"); 1100 } 1101 1102 return 0; 1103 } 1104 #else 1105 static int bcm_acpi_probe(struct bcm_device *dev) 1106 { 1107 return -EINVAL; 1108 } 1109 #endif /* CONFIG_ACPI */ 1110 1111 static int bcm_of_probe(struct bcm_device *bdev) 1112 { 1113 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed); 1114 return 0; 1115 } 1116 1117 static int bcm_probe(struct platform_device *pdev) 1118 { 1119 struct bcm_device *dev; 1120 int ret; 1121 1122 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 1123 if (!dev) 1124 return -ENOMEM; 1125 1126 dev->dev = &pdev->dev; 1127 dev->irq = platform_get_irq(pdev, 0); 1128 1129 if (has_acpi_companion(&pdev->dev)) { 1130 ret = bcm_acpi_probe(dev); 1131 if (ret) 1132 return ret; 1133 } 1134 1135 ret = bcm_get_resources(dev); 1136 if (ret) 1137 return ret; 1138 1139 platform_set_drvdata(pdev, dev); 1140 1141 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 1142 1143 /* Place this instance on the device list */ 1144 mutex_lock(&bcm_device_lock); 1145 list_add_tail(&dev->list, &bcm_device_list); 1146 mutex_unlock(&bcm_device_lock); 1147 1148 ret = bcm_gpio_set_power(dev, false); 1149 if (ret) 1150 dev_err(&pdev->dev, "Failed to power down\n"); 1151 1152 return 0; 1153 } 1154 1155 static int bcm_remove(struct platform_device *pdev) 1156 { 1157 struct bcm_device *dev = platform_get_drvdata(pdev); 1158 1159 mutex_lock(&bcm_device_lock); 1160 list_del(&dev->list); 1161 mutex_unlock(&bcm_device_lock); 1162 1163 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 1164 1165 return 0; 1166 } 1167 1168 static const struct hci_uart_proto bcm_proto = { 1169 .id = HCI_UART_BCM, 1170 .name = "Broadcom", 1171 .manufacturer = 15, 1172 .init_speed = 115200, 1173 .open = bcm_open, 1174 .close = bcm_close, 1175 .flush = bcm_flush, 1176 .setup = bcm_setup, 1177 .set_baudrate = bcm_set_baudrate, 1178 .recv = bcm_recv, 1179 .enqueue = bcm_enqueue, 1180 .dequeue = bcm_dequeue, 1181 }; 1182 1183 #ifdef CONFIG_ACPI 1184 static const struct acpi_device_id bcm_acpi_match[] = { 1185 { "BCM2E00" }, 1186 { "BCM2E01" }, 1187 { "BCM2E02" }, 1188 { "BCM2E03" }, 1189 { "BCM2E04" }, 1190 { "BCM2E05" }, 1191 { "BCM2E06" }, 1192 { "BCM2E07" }, 1193 { "BCM2E08" }, 1194 { "BCM2E09" }, 1195 { "BCM2E0A" }, 1196 { "BCM2E0B" }, 1197 { "BCM2E0C" }, 1198 { "BCM2E0D" }, 1199 { "BCM2E0E" }, 1200 { "BCM2E0F" }, 1201 { "BCM2E10" }, 1202 { "BCM2E11" }, 1203 { "BCM2E12" }, 1204 { "BCM2E13" }, 1205 { "BCM2E14" }, 1206 { "BCM2E15" }, 1207 { "BCM2E16" }, 1208 { "BCM2E17" }, 1209 { "BCM2E18" }, 1210 { "BCM2E19" }, 1211 { "BCM2E1A" }, 1212 { "BCM2E1B" }, 1213 { "BCM2E1C" }, 1214 { "BCM2E1D" }, 1215 { "BCM2E1F" }, 1216 { "BCM2E20" }, 1217 { "BCM2E21" }, 1218 { "BCM2E22" }, 1219 { "BCM2E23" }, 1220 { "BCM2E24" }, 1221 { "BCM2E25" }, 1222 { "BCM2E26" }, 1223 { "BCM2E27" }, 1224 { "BCM2E28" }, 1225 { "BCM2E29" }, 1226 { "BCM2E2A" }, 1227 { "BCM2E2B" }, 1228 { "BCM2E2C" }, 1229 { "BCM2E2D" }, 1230 { "BCM2E2E" }, 1231 { "BCM2E2F" }, 1232 { "BCM2E30" }, 1233 { "BCM2E31" }, 1234 { "BCM2E32" }, 1235 { "BCM2E33" }, 1236 { "BCM2E34" }, 1237 { "BCM2E35" }, 1238 { "BCM2E36" }, 1239 { "BCM2E37" }, 1240 { "BCM2E38" }, 1241 { "BCM2E39" }, 1242 { "BCM2E3A" }, 1243 { "BCM2E3B" }, 1244 { "BCM2E3C" }, 1245 { "BCM2E3D" }, 1246 { "BCM2E3E" }, 1247 { "BCM2E3F" }, 1248 { "BCM2E40" }, 1249 { "BCM2E41" }, 1250 { "BCM2E42" }, 1251 { "BCM2E43" }, 1252 { "BCM2E44" }, 1253 { "BCM2E45" }, 1254 { "BCM2E46" }, 1255 { "BCM2E47" }, 1256 { "BCM2E48" }, 1257 { "BCM2E49" }, 1258 { "BCM2E4A" }, 1259 { "BCM2E4B" }, 1260 { "BCM2E4C" }, 1261 { "BCM2E4D" }, 1262 { "BCM2E4E" }, 1263 { "BCM2E4F" }, 1264 { "BCM2E50" }, 1265 { "BCM2E51" }, 1266 { "BCM2E52" }, 1267 { "BCM2E53" }, 1268 { "BCM2E54" }, 1269 { "BCM2E55" }, 1270 { "BCM2E56" }, 1271 { "BCM2E57" }, 1272 { "BCM2E58" }, 1273 { "BCM2E59" }, 1274 { "BCM2E5A" }, 1275 { "BCM2E5B" }, 1276 { "BCM2E5C" }, 1277 { "BCM2E5D" }, 1278 { "BCM2E5E" }, 1279 { "BCM2E5F" }, 1280 { "BCM2E60" }, 1281 { "BCM2E61" }, 1282 { "BCM2E62" }, 1283 { "BCM2E63" }, 1284 { "BCM2E64" }, 1285 { "BCM2E65" }, 1286 { "BCM2E66" }, 1287 { "BCM2E67" }, 1288 { "BCM2E68" }, 1289 { "BCM2E69" }, 1290 { "BCM2E6B" }, 1291 { "BCM2E6D" }, 1292 { "BCM2E6E" }, 1293 { "BCM2E6F" }, 1294 { "BCM2E70" }, 1295 { "BCM2E71" }, 1296 { "BCM2E72" }, 1297 { "BCM2E73" }, 1298 { "BCM2E74" }, 1299 { "BCM2E75" }, 1300 { "BCM2E76" }, 1301 { "BCM2E77" }, 1302 { "BCM2E78" }, 1303 { "BCM2E79" }, 1304 { "BCM2E7A" }, 1305 { "BCM2E7B" }, 1306 { "BCM2E7C" }, 1307 { "BCM2E7D" }, 1308 { "BCM2E7E" }, 1309 { "BCM2E7F" }, 1310 { "BCM2E80" }, 1311 { "BCM2E81" }, 1312 { "BCM2E82" }, 1313 { "BCM2E83" }, 1314 { "BCM2E84" }, 1315 { "BCM2E85" }, 1316 { "BCM2E86" }, 1317 { "BCM2E87" }, 1318 { "BCM2E88" }, 1319 { "BCM2E89" }, 1320 { "BCM2E8A" }, 1321 { "BCM2E8B" }, 1322 { "BCM2E8C" }, 1323 { "BCM2E8D" }, 1324 { "BCM2E8E" }, 1325 { "BCM2E90" }, 1326 { "BCM2E92" }, 1327 { "BCM2E93" }, 1328 { "BCM2E94" }, 1329 { "BCM2E95" }, 1330 { "BCM2E96" }, 1331 { "BCM2E97" }, 1332 { "BCM2E98" }, 1333 { "BCM2E99" }, 1334 { "BCM2E9A" }, 1335 { "BCM2E9B" }, 1336 { "BCM2E9C" }, 1337 { "BCM2E9D" }, 1338 { "BCM2EA0" }, 1339 { "BCM2EA1" }, 1340 { "BCM2EA2" }, 1341 { "BCM2EA3" }, 1342 { "BCM2EA4" }, 1343 { "BCM2EA5" }, 1344 { "BCM2EA6" }, 1345 { "BCM2EA7" }, 1346 { "BCM2EA8" }, 1347 { "BCM2EA9" }, 1348 { "BCM2EAA" }, 1349 { "BCM2EAB" }, 1350 { "BCM2EAC" }, 1351 { }, 1352 }; 1353 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 1354 #endif 1355 1356 /* suspend and resume callbacks */ 1357 static const struct dev_pm_ops bcm_pm_ops = { 1358 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 1359 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 1360 }; 1361 1362 static struct platform_driver bcm_driver = { 1363 .probe = bcm_probe, 1364 .remove = bcm_remove, 1365 .driver = { 1366 .name = "hci_bcm", 1367 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1368 .pm = &bcm_pm_ops, 1369 }, 1370 }; 1371 1372 static int bcm_serdev_probe(struct serdev_device *serdev) 1373 { 1374 struct bcm_device *bcmdev; 1375 int err; 1376 1377 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL); 1378 if (!bcmdev) 1379 return -ENOMEM; 1380 1381 bcmdev->dev = &serdev->dev; 1382 #ifdef CONFIG_PM 1383 bcmdev->hu = &bcmdev->serdev_hu; 1384 #endif 1385 bcmdev->serdev_hu.serdev = serdev; 1386 serdev_device_set_drvdata(serdev, bcmdev); 1387 1388 if (has_acpi_companion(&serdev->dev)) 1389 err = bcm_acpi_probe(bcmdev); 1390 else 1391 err = bcm_of_probe(bcmdev); 1392 if (err) 1393 return err; 1394 1395 err = bcm_get_resources(bcmdev); 1396 if (err) 1397 return err; 1398 1399 if (!bcmdev->shutdown) { 1400 dev_warn(&serdev->dev, 1401 "No reset resource, using default baud rate\n"); 1402 bcmdev->oper_speed = bcmdev->init_speed; 1403 } 1404 1405 err = bcm_gpio_set_power(bcmdev, false); 1406 if (err) 1407 dev_err(&serdev->dev, "Failed to power down\n"); 1408 1409 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto); 1410 } 1411 1412 static void bcm_serdev_remove(struct serdev_device *serdev) 1413 { 1414 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev); 1415 1416 hci_uart_unregister_device(&bcmdev->serdev_hu); 1417 } 1418 1419 #ifdef CONFIG_OF 1420 static const struct of_device_id bcm_bluetooth_of_match[] = { 1421 { .compatible = "brcm,bcm20702a1" }, 1422 { .compatible = "brcm,bcm4345c5" }, 1423 { .compatible = "brcm,bcm4330-bt" }, 1424 { .compatible = "brcm,bcm43438-bt" }, 1425 { }, 1426 }; 1427 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match); 1428 #endif 1429 1430 static struct serdev_device_driver bcm_serdev_driver = { 1431 .probe = bcm_serdev_probe, 1432 .remove = bcm_serdev_remove, 1433 .driver = { 1434 .name = "hci_uart_bcm", 1435 .of_match_table = of_match_ptr(bcm_bluetooth_of_match), 1436 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1437 .pm = &bcm_pm_ops, 1438 }, 1439 }; 1440 1441 int __init bcm_init(void) 1442 { 1443 /* For now, we need to keep both platform device 1444 * driver (ACPI generated) and serdev driver (DT). 1445 */ 1446 platform_driver_register(&bcm_driver); 1447 serdev_device_driver_register(&bcm_serdev_driver); 1448 1449 return hci_uart_register_proto(&bcm_proto); 1450 } 1451 1452 int __exit bcm_deinit(void) 1453 { 1454 platform_driver_unregister(&bcm_driver); 1455 serdev_device_driver_unregister(&bcm_serdev_driver); 1456 1457 return hci_uart_unregister_proto(&bcm_proto); 1458 } 1459