1 /* 2 * 3 * Bluetooth HCI UART driver for Broadcom devices 4 * 5 * Copyright (C) 2015 Intel Corporation 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/errno.h> 26 #include <linux/skbuff.h> 27 #include <linux/firmware.h> 28 #include <linux/module.h> 29 #include <linux/acpi.h> 30 #include <linux/of.h> 31 #include <linux/property.h> 32 #include <linux/platform_data/x86/apple.h> 33 #include <linux/platform_device.h> 34 #include <linux/regulator/consumer.h> 35 #include <linux/clk.h> 36 #include <linux/gpio/consumer.h> 37 #include <linux/tty.h> 38 #include <linux/interrupt.h> 39 #include <linux/dmi.h> 40 #include <linux/pm_runtime.h> 41 #include <linux/serdev.h> 42 43 #include <net/bluetooth/bluetooth.h> 44 #include <net/bluetooth/hci_core.h> 45 46 #include "btbcm.h" 47 #include "hci_uart.h" 48 49 #define BCM_NULL_PKT 0x00 50 #define BCM_NULL_SIZE 0 51 52 #define BCM_LM_DIAG_PKT 0x07 53 #define BCM_LM_DIAG_SIZE 63 54 55 #define BCM_TYPE49_PKT 0x31 56 #define BCM_TYPE49_SIZE 0 57 58 #define BCM_TYPE52_PKT 0x34 59 #define BCM_TYPE52_SIZE 0 60 61 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ 62 63 #define BCM_NUM_SUPPLIES 2 64 65 /** 66 * struct bcm_device - device driver resources 67 * @serdev_hu: HCI UART controller struct 68 * @list: bcm_device_list node 69 * @dev: physical UART slave 70 * @name: device name logged by bt_dev_*() functions 71 * @device_wakeup: BT_WAKE pin, 72 * assert = Bluetooth device must wake up or remain awake, 73 * deassert = Bluetooth device may sleep when sleep criteria are met 74 * @shutdown: BT_REG_ON pin, 75 * power up or power down Bluetooth device internal regulators 76 * @set_device_wakeup: callback to toggle BT_WAKE pin 77 * either by accessing @device_wakeup or by calling @btlp 78 * @set_shutdown: callback to toggle BT_REG_ON pin 79 * either by accessing @shutdown or by calling @btpu/@btpd 80 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power") 81 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up") 82 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down") 83 * @txco_clk: external reference frequency clock used by Bluetooth device 84 * @lpo_clk: external LPO clock used by Bluetooth device 85 * @supplies: VBAT and VDDIO supplies used by Bluetooth device 86 * @res_enabled: whether clocks and supplies are prepared and enabled 87 * @init_speed: default baudrate of Bluetooth device; 88 * the host UART is initially set to this baudrate so that 89 * it can configure the Bluetooth device for @oper_speed 90 * @oper_speed: preferred baudrate of Bluetooth device; 91 * set to 0 if @init_speed is already the preferred baudrate 92 * @irq: interrupt triggered by HOST_WAKE_BT pin 93 * @irq_active_low: whether @irq is active low 94 * @hu: pointer to HCI UART controller struct, 95 * used to disable flow control during runtime suspend and system sleep 96 * @is_suspended: whether flow control is currently disabled 97 */ 98 struct bcm_device { 99 /* Must be the first member, hci_serdev.c expects this. */ 100 struct hci_uart serdev_hu; 101 struct list_head list; 102 103 struct device *dev; 104 105 const char *name; 106 struct gpio_desc *device_wakeup; 107 struct gpio_desc *shutdown; 108 int (*set_device_wakeup)(struct bcm_device *, bool); 109 int (*set_shutdown)(struct bcm_device *, bool); 110 #ifdef CONFIG_ACPI 111 acpi_handle btlp, btpu, btpd; 112 int gpio_count; 113 int gpio_int_idx; 114 #endif 115 116 struct clk *txco_clk; 117 struct clk *lpo_clk; 118 struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES]; 119 bool res_enabled; 120 121 u32 init_speed; 122 u32 oper_speed; 123 int irq; 124 bool irq_active_low; 125 126 #ifdef CONFIG_PM 127 struct hci_uart *hu; 128 bool is_suspended; 129 #endif 130 }; 131 132 /* generic bcm uart resources */ 133 struct bcm_data { 134 struct sk_buff *rx_skb; 135 struct sk_buff_head txq; 136 137 struct bcm_device *dev; 138 }; 139 140 /* List of BCM BT UART devices */ 141 static DEFINE_MUTEX(bcm_device_lock); 142 static LIST_HEAD(bcm_device_list); 143 144 static int irq_polarity = -1; 145 module_param(irq_polarity, int, 0444); 146 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low"); 147 148 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 149 { 150 if (hu->serdev) 151 serdev_device_set_baudrate(hu->serdev, speed); 152 else 153 hci_uart_set_baudrate(hu, speed); 154 } 155 156 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) 157 { 158 struct hci_dev *hdev = hu->hdev; 159 struct sk_buff *skb; 160 struct bcm_update_uart_baud_rate param; 161 162 if (speed > 3000000) { 163 struct bcm_write_uart_clock_setting clock; 164 165 clock.type = BCM_UART_CLOCK_48MHZ; 166 167 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type); 168 169 /* This Broadcom specific command changes the UART's controller 170 * clock for baud rate > 3000000. 171 */ 172 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); 173 if (IS_ERR(skb)) { 174 int err = PTR_ERR(skb); 175 bt_dev_err(hdev, "BCM: failed to write clock (%d)", 176 err); 177 return err; 178 } 179 180 kfree_skb(skb); 181 } 182 183 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed); 184 185 param.zero = cpu_to_le16(0); 186 param.baud_rate = cpu_to_le32(speed); 187 188 /* This Broadcom specific command changes the UART's controller baud 189 * rate. 190 */ 191 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, 192 HCI_INIT_TIMEOUT); 193 if (IS_ERR(skb)) { 194 int err = PTR_ERR(skb); 195 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)", 196 err); 197 return err; 198 } 199 200 kfree_skb(skb); 201 202 return 0; 203 } 204 205 /* bcm_device_exists should be protected by bcm_device_lock */ 206 static bool bcm_device_exists(struct bcm_device *device) 207 { 208 struct list_head *p; 209 210 #ifdef CONFIG_PM 211 /* Devices using serdev always exist */ 212 if (device && device->hu && device->hu->serdev) 213 return true; 214 #endif 215 216 list_for_each(p, &bcm_device_list) { 217 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 218 219 if (device == dev) 220 return true; 221 } 222 223 return false; 224 } 225 226 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) 227 { 228 int err; 229 230 if (powered && !dev->res_enabled) { 231 /* Intel Macs use bcm_apple_get_resources() and don't 232 * have regulator supplies configured. 233 */ 234 if (dev->supplies[0].supply) { 235 err = regulator_bulk_enable(BCM_NUM_SUPPLIES, 236 dev->supplies); 237 if (err) 238 return err; 239 } 240 241 /* LPO clock needs to be 32.768 kHz */ 242 err = clk_set_rate(dev->lpo_clk, 32768); 243 if (err) { 244 dev_err(dev->dev, "Could not set LPO clock rate\n"); 245 goto err_regulator_disable; 246 } 247 248 err = clk_prepare_enable(dev->lpo_clk); 249 if (err) 250 goto err_regulator_disable; 251 252 err = clk_prepare_enable(dev->txco_clk); 253 if (err) 254 goto err_lpo_clk_disable; 255 } 256 257 err = dev->set_shutdown(dev, powered); 258 if (err) 259 goto err_txco_clk_disable; 260 261 err = dev->set_device_wakeup(dev, powered); 262 if (err) 263 goto err_revert_shutdown; 264 265 if (!powered && dev->res_enabled) { 266 clk_disable_unprepare(dev->txco_clk); 267 clk_disable_unprepare(dev->lpo_clk); 268 269 /* Intel Macs use bcm_apple_get_resources() and don't 270 * have regulator supplies configured. 271 */ 272 if (dev->supplies[0].supply) 273 regulator_bulk_disable(BCM_NUM_SUPPLIES, 274 dev->supplies); 275 } 276 277 /* wait for device to power on and come out of reset */ 278 usleep_range(10000, 20000); 279 280 dev->res_enabled = powered; 281 282 return 0; 283 284 err_revert_shutdown: 285 dev->set_shutdown(dev, !powered); 286 err_txco_clk_disable: 287 if (powered && !dev->res_enabled) 288 clk_disable_unprepare(dev->txco_clk); 289 err_lpo_clk_disable: 290 if (powered && !dev->res_enabled) 291 clk_disable_unprepare(dev->lpo_clk); 292 err_regulator_disable: 293 if (powered && !dev->res_enabled) 294 regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies); 295 return err; 296 } 297 298 #ifdef CONFIG_PM 299 static irqreturn_t bcm_host_wake(int irq, void *data) 300 { 301 struct bcm_device *bdev = data; 302 303 bt_dev_dbg(bdev, "Host wake IRQ"); 304 305 pm_runtime_get(bdev->dev); 306 pm_runtime_mark_last_busy(bdev->dev); 307 pm_runtime_put_autosuspend(bdev->dev); 308 309 return IRQ_HANDLED; 310 } 311 312 static int bcm_request_irq(struct bcm_data *bcm) 313 { 314 struct bcm_device *bdev = bcm->dev; 315 int err; 316 317 mutex_lock(&bcm_device_lock); 318 if (!bcm_device_exists(bdev)) { 319 err = -ENODEV; 320 goto unlock; 321 } 322 323 if (bdev->irq <= 0) { 324 err = -EOPNOTSUPP; 325 goto unlock; 326 } 327 328 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake, 329 bdev->irq_active_low ? IRQF_TRIGGER_FALLING : 330 IRQF_TRIGGER_RISING, 331 "host_wake", bdev); 332 if (err) { 333 bdev->irq = err; 334 goto unlock; 335 } 336 337 device_init_wakeup(bdev->dev, true); 338 339 pm_runtime_set_autosuspend_delay(bdev->dev, 340 BCM_AUTOSUSPEND_DELAY); 341 pm_runtime_use_autosuspend(bdev->dev); 342 pm_runtime_set_active(bdev->dev); 343 pm_runtime_enable(bdev->dev); 344 345 unlock: 346 mutex_unlock(&bcm_device_lock); 347 348 return err; 349 } 350 351 static const struct bcm_set_sleep_mode default_sleep_params = { 352 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */ 353 .idle_host = 2, /* idle threshold HOST, in 300ms */ 354 .idle_dev = 2, /* idle threshold device, in 300ms */ 355 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */ 356 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */ 357 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */ 358 .combine_modes = 1, /* Combine sleep and LPM flag */ 359 .tristate_control = 0, /* Allow tri-state control of UART tx flag */ 360 /* Irrelevant USB flags */ 361 .usb_auto_sleep = 0, 362 .usb_resume_timeout = 0, 363 .break_to_host = 0, 364 .pulsed_host_wake = 1, 365 }; 366 367 static int bcm_setup_sleep(struct hci_uart *hu) 368 { 369 struct bcm_data *bcm = hu->priv; 370 struct sk_buff *skb; 371 struct bcm_set_sleep_mode sleep_params = default_sleep_params; 372 373 sleep_params.host_wake_active = !bcm->dev->irq_active_low; 374 375 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params), 376 &sleep_params, HCI_INIT_TIMEOUT); 377 if (IS_ERR(skb)) { 378 int err = PTR_ERR(skb); 379 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err); 380 return err; 381 } 382 kfree_skb(skb); 383 384 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded"); 385 386 return 0; 387 } 388 #else 389 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; } 390 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; } 391 #endif 392 393 static int bcm_set_diag(struct hci_dev *hdev, bool enable) 394 { 395 struct hci_uart *hu = hci_get_drvdata(hdev); 396 struct bcm_data *bcm = hu->priv; 397 struct sk_buff *skb; 398 399 if (!test_bit(HCI_RUNNING, &hdev->flags)) 400 return -ENETDOWN; 401 402 skb = bt_skb_alloc(3, GFP_KERNEL); 403 if (!skb) 404 return -ENOMEM; 405 406 skb_put_u8(skb, BCM_LM_DIAG_PKT); 407 skb_put_u8(skb, 0xf0); 408 skb_put_u8(skb, enable); 409 410 skb_queue_tail(&bcm->txq, skb); 411 hci_uart_tx_wakeup(hu); 412 413 return 0; 414 } 415 416 static int bcm_open(struct hci_uart *hu) 417 { 418 struct bcm_data *bcm; 419 struct list_head *p; 420 int err; 421 422 bt_dev_dbg(hu->hdev, "hu %p", hu); 423 424 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); 425 if (!bcm) 426 return -ENOMEM; 427 428 skb_queue_head_init(&bcm->txq); 429 430 hu->priv = bcm; 431 432 mutex_lock(&bcm_device_lock); 433 434 if (hu->serdev) { 435 bcm->dev = serdev_device_get_drvdata(hu->serdev); 436 goto out; 437 } 438 439 if (!hu->tty->dev) 440 goto out; 441 442 list_for_each(p, &bcm_device_list) { 443 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 444 445 /* Retrieve saved bcm_device based on parent of the 446 * platform device (saved during device probe) and 447 * parent of tty device used by hci_uart 448 */ 449 if (hu->tty->dev->parent == dev->dev->parent) { 450 bcm->dev = dev; 451 #ifdef CONFIG_PM 452 dev->hu = hu; 453 #endif 454 break; 455 } 456 } 457 458 out: 459 if (bcm->dev) { 460 hu->init_speed = bcm->dev->init_speed; 461 hu->oper_speed = bcm->dev->oper_speed; 462 err = bcm_gpio_set_power(bcm->dev, true); 463 if (err) 464 goto err_unset_hu; 465 } 466 467 mutex_unlock(&bcm_device_lock); 468 return 0; 469 470 err_unset_hu: 471 #ifdef CONFIG_PM 472 if (!hu->serdev) 473 bcm->dev->hu = NULL; 474 #endif 475 mutex_unlock(&bcm_device_lock); 476 hu->priv = NULL; 477 kfree(bcm); 478 return err; 479 } 480 481 static int bcm_close(struct hci_uart *hu) 482 { 483 struct bcm_data *bcm = hu->priv; 484 struct bcm_device *bdev = NULL; 485 int err; 486 487 bt_dev_dbg(hu->hdev, "hu %p", hu); 488 489 /* Protect bcm->dev against removal of the device or driver */ 490 mutex_lock(&bcm_device_lock); 491 492 if (hu->serdev) { 493 bdev = serdev_device_get_drvdata(hu->serdev); 494 } else if (bcm_device_exists(bcm->dev)) { 495 bdev = bcm->dev; 496 #ifdef CONFIG_PM 497 bdev->hu = NULL; 498 #endif 499 } 500 501 if (bdev) { 502 if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) { 503 devm_free_irq(bdev->dev, bdev->irq, bdev); 504 device_init_wakeup(bdev->dev, false); 505 pm_runtime_disable(bdev->dev); 506 } 507 508 err = bcm_gpio_set_power(bdev, false); 509 if (err) 510 bt_dev_err(hu->hdev, "Failed to power down"); 511 else 512 pm_runtime_set_suspended(bdev->dev); 513 } 514 mutex_unlock(&bcm_device_lock); 515 516 skb_queue_purge(&bcm->txq); 517 kfree_skb(bcm->rx_skb); 518 kfree(bcm); 519 520 hu->priv = NULL; 521 return 0; 522 } 523 524 static int bcm_flush(struct hci_uart *hu) 525 { 526 struct bcm_data *bcm = hu->priv; 527 528 bt_dev_dbg(hu->hdev, "hu %p", hu); 529 530 skb_queue_purge(&bcm->txq); 531 532 return 0; 533 } 534 535 static int bcm_setup(struct hci_uart *hu) 536 { 537 struct bcm_data *bcm = hu->priv; 538 char fw_name[64]; 539 const struct firmware *fw; 540 unsigned int speed; 541 int err; 542 543 bt_dev_dbg(hu->hdev, "hu %p", hu); 544 545 hu->hdev->set_diag = bcm_set_diag; 546 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 547 548 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name), false); 549 if (err) 550 return err; 551 552 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 553 if (err < 0) { 554 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 555 return 0; 556 } 557 558 err = btbcm_patchram(hu->hdev, fw); 559 if (err) { 560 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 561 goto finalize; 562 } 563 564 /* Init speed if any */ 565 if (hu->init_speed) 566 speed = hu->init_speed; 567 else if (hu->proto->init_speed) 568 speed = hu->proto->init_speed; 569 else 570 speed = 0; 571 572 if (speed) 573 host_set_baudrate(hu, speed); 574 575 /* Operational speed if any */ 576 if (hu->oper_speed) 577 speed = hu->oper_speed; 578 else if (hu->proto->oper_speed) 579 speed = hu->proto->oper_speed; 580 else 581 speed = 0; 582 583 if (speed) { 584 err = bcm_set_baudrate(hu, speed); 585 if (!err) 586 host_set_baudrate(hu, speed); 587 } 588 589 finalize: 590 release_firmware(fw); 591 592 err = btbcm_finalize(hu->hdev); 593 if (err) 594 return err; 595 596 if (!bcm_request_irq(bcm)) 597 err = bcm_setup_sleep(hu); 598 599 return err; 600 } 601 602 #define BCM_RECV_LM_DIAG \ 603 .type = BCM_LM_DIAG_PKT, \ 604 .hlen = BCM_LM_DIAG_SIZE, \ 605 .loff = 0, \ 606 .lsize = 0, \ 607 .maxlen = BCM_LM_DIAG_SIZE 608 609 #define BCM_RECV_NULL \ 610 .type = BCM_NULL_PKT, \ 611 .hlen = BCM_NULL_SIZE, \ 612 .loff = 0, \ 613 .lsize = 0, \ 614 .maxlen = BCM_NULL_SIZE 615 616 #define BCM_RECV_TYPE49 \ 617 .type = BCM_TYPE49_PKT, \ 618 .hlen = BCM_TYPE49_SIZE, \ 619 .loff = 0, \ 620 .lsize = 0, \ 621 .maxlen = BCM_TYPE49_SIZE 622 623 #define BCM_RECV_TYPE52 \ 624 .type = BCM_TYPE52_PKT, \ 625 .hlen = BCM_TYPE52_SIZE, \ 626 .loff = 0, \ 627 .lsize = 0, \ 628 .maxlen = BCM_TYPE52_SIZE 629 630 static const struct h4_recv_pkt bcm_recv_pkts[] = { 631 { H4_RECV_ACL, .recv = hci_recv_frame }, 632 { H4_RECV_SCO, .recv = hci_recv_frame }, 633 { H4_RECV_EVENT, .recv = hci_recv_frame }, 634 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 635 { BCM_RECV_NULL, .recv = hci_recv_diag }, 636 { BCM_RECV_TYPE49, .recv = hci_recv_diag }, 637 { BCM_RECV_TYPE52, .recv = hci_recv_diag }, 638 }; 639 640 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 641 { 642 struct bcm_data *bcm = hu->priv; 643 644 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 645 return -EUNATCH; 646 647 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 648 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 649 if (IS_ERR(bcm->rx_skb)) { 650 int err = PTR_ERR(bcm->rx_skb); 651 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 652 bcm->rx_skb = NULL; 653 return err; 654 } else if (!bcm->rx_skb) { 655 /* Delay auto-suspend when receiving completed packet */ 656 mutex_lock(&bcm_device_lock); 657 if (bcm->dev && bcm_device_exists(bcm->dev)) { 658 pm_runtime_get(bcm->dev->dev); 659 pm_runtime_mark_last_busy(bcm->dev->dev); 660 pm_runtime_put_autosuspend(bcm->dev->dev); 661 } 662 mutex_unlock(&bcm_device_lock); 663 } 664 665 return count; 666 } 667 668 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 669 { 670 struct bcm_data *bcm = hu->priv; 671 672 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 673 674 /* Prepend skb with frame type */ 675 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 676 skb_queue_tail(&bcm->txq, skb); 677 678 return 0; 679 } 680 681 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 682 { 683 struct bcm_data *bcm = hu->priv; 684 struct sk_buff *skb = NULL; 685 struct bcm_device *bdev = NULL; 686 687 mutex_lock(&bcm_device_lock); 688 689 if (bcm_device_exists(bcm->dev)) { 690 bdev = bcm->dev; 691 pm_runtime_get_sync(bdev->dev); 692 /* Shall be resumed here */ 693 } 694 695 skb = skb_dequeue(&bcm->txq); 696 697 if (bdev) { 698 pm_runtime_mark_last_busy(bdev->dev); 699 pm_runtime_put_autosuspend(bdev->dev); 700 } 701 702 mutex_unlock(&bcm_device_lock); 703 704 return skb; 705 } 706 707 #ifdef CONFIG_PM 708 static int bcm_suspend_device(struct device *dev) 709 { 710 struct bcm_device *bdev = dev_get_drvdata(dev); 711 int err; 712 713 bt_dev_dbg(bdev, ""); 714 715 if (!bdev->is_suspended && bdev->hu) { 716 hci_uart_set_flow_control(bdev->hu, true); 717 718 /* Once this returns, driver suspends BT via GPIO */ 719 bdev->is_suspended = true; 720 } 721 722 /* Suspend the device */ 723 err = bdev->set_device_wakeup(bdev, false); 724 if (err) { 725 if (bdev->is_suspended && bdev->hu) { 726 bdev->is_suspended = false; 727 hci_uart_set_flow_control(bdev->hu, false); 728 } 729 return -EBUSY; 730 } 731 732 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 733 msleep(15); 734 735 return 0; 736 } 737 738 static int bcm_resume_device(struct device *dev) 739 { 740 struct bcm_device *bdev = dev_get_drvdata(dev); 741 int err; 742 743 bt_dev_dbg(bdev, ""); 744 745 err = bdev->set_device_wakeup(bdev, true); 746 if (err) { 747 dev_err(dev, "Failed to power up\n"); 748 return err; 749 } 750 751 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 752 msleep(15); 753 754 /* When this executes, the device has woken up already */ 755 if (bdev->is_suspended && bdev->hu) { 756 bdev->is_suspended = false; 757 758 hci_uart_set_flow_control(bdev->hu, false); 759 } 760 761 return 0; 762 } 763 #endif 764 765 #ifdef CONFIG_PM_SLEEP 766 /* suspend callback */ 767 static int bcm_suspend(struct device *dev) 768 { 769 struct bcm_device *bdev = dev_get_drvdata(dev); 770 int error; 771 772 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 773 774 /* 775 * When used with a device instantiated as platform_device, bcm_suspend 776 * can be called at any time as long as the platform device is bound, 777 * so it should use bcm_device_lock to protect access to hci_uart 778 * and device_wake-up GPIO. 779 */ 780 mutex_lock(&bcm_device_lock); 781 782 if (!bdev->hu) 783 goto unlock; 784 785 if (pm_runtime_active(dev)) 786 bcm_suspend_device(dev); 787 788 if (device_may_wakeup(dev) && bdev->irq > 0) { 789 error = enable_irq_wake(bdev->irq); 790 if (!error) 791 bt_dev_dbg(bdev, "BCM irq: enabled"); 792 } 793 794 unlock: 795 mutex_unlock(&bcm_device_lock); 796 797 return 0; 798 } 799 800 /* resume callback */ 801 static int bcm_resume(struct device *dev) 802 { 803 struct bcm_device *bdev = dev_get_drvdata(dev); 804 int err = 0; 805 806 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 807 808 /* 809 * When used with a device instantiated as platform_device, bcm_resume 810 * can be called at any time as long as platform device is bound, 811 * so it should use bcm_device_lock to protect access to hci_uart 812 * and device_wake-up GPIO. 813 */ 814 mutex_lock(&bcm_device_lock); 815 816 if (!bdev->hu) 817 goto unlock; 818 819 if (device_may_wakeup(dev) && bdev->irq > 0) { 820 disable_irq_wake(bdev->irq); 821 bt_dev_dbg(bdev, "BCM irq: disabled"); 822 } 823 824 err = bcm_resume_device(dev); 825 826 unlock: 827 mutex_unlock(&bcm_device_lock); 828 829 if (!err) { 830 pm_runtime_disable(dev); 831 pm_runtime_set_active(dev); 832 pm_runtime_enable(dev); 833 } 834 835 return 0; 836 } 837 #endif 838 839 static const struct acpi_gpio_params first_gpio = { 0, 0, false }; 840 static const struct acpi_gpio_params second_gpio = { 1, 0, false }; 841 static const struct acpi_gpio_params third_gpio = { 2, 0, false }; 842 843 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 844 { "device-wakeup-gpios", &first_gpio, 1 }, 845 { "shutdown-gpios", &second_gpio, 1 }, 846 { "host-wakeup-gpios", &third_gpio, 1 }, 847 { }, 848 }; 849 850 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 851 { "host-wakeup-gpios", &first_gpio, 1 }, 852 { "device-wakeup-gpios", &second_gpio, 1 }, 853 { "shutdown-gpios", &third_gpio, 1 }, 854 { }, 855 }; 856 857 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */ 858 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = { 859 { 860 .ident = "Meegopad T08", 861 .matches = { 862 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, 863 "To be filled by OEM."), 864 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"), 865 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"), 866 }, 867 }, 868 { } 869 }; 870 871 #ifdef CONFIG_ACPI 872 static int bcm_resource(struct acpi_resource *ares, void *data) 873 { 874 struct bcm_device *dev = data; 875 struct acpi_resource_extended_irq *irq; 876 struct acpi_resource_gpio *gpio; 877 struct acpi_resource_uart_serialbus *sb; 878 879 switch (ares->type) { 880 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 881 irq = &ares->data.extended_irq; 882 if (irq->polarity != ACPI_ACTIVE_LOW) 883 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n"); 884 dev->irq_active_low = true; 885 break; 886 887 case ACPI_RESOURCE_TYPE_GPIO: 888 gpio = &ares->data.gpio; 889 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) { 890 dev->gpio_int_idx = dev->gpio_count; 891 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW; 892 } 893 dev->gpio_count++; 894 break; 895 896 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 897 sb = &ares->data.uart_serial_bus; 898 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { 899 dev->init_speed = sb->default_baud_rate; 900 dev->oper_speed = 4000000; 901 } 902 break; 903 904 default: 905 break; 906 } 907 908 return 0; 909 } 910 911 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake) 912 { 913 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake))) 914 return -EIO; 915 916 return 0; 917 } 918 919 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered) 920 { 921 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd, 922 NULL, NULL, NULL))) 923 return -EIO; 924 925 return 0; 926 } 927 928 static int bcm_apple_get_resources(struct bcm_device *dev) 929 { 930 struct acpi_device *adev = ACPI_COMPANION(dev->dev); 931 const union acpi_object *obj; 932 933 if (!adev || 934 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) || 935 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) || 936 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd))) 937 return -ENODEV; 938 939 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) && 940 obj->buffer.length == 8) 941 dev->init_speed = *(u64 *)obj->buffer.pointer; 942 943 dev->set_device_wakeup = bcm_apple_set_device_wakeup; 944 dev->set_shutdown = bcm_apple_set_shutdown; 945 946 return 0; 947 } 948 #else 949 static inline int bcm_apple_get_resources(struct bcm_device *dev) 950 { 951 return -EOPNOTSUPP; 952 } 953 #endif /* CONFIG_ACPI */ 954 955 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake) 956 { 957 gpiod_set_value_cansleep(dev->device_wakeup, awake); 958 return 0; 959 } 960 961 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered) 962 { 963 gpiod_set_value_cansleep(dev->shutdown, powered); 964 return 0; 965 } 966 967 /* Try a bunch of names for TXCO */ 968 static struct clk *bcm_get_txco(struct device *dev) 969 { 970 struct clk *clk; 971 972 /* New explicit name */ 973 clk = devm_clk_get(dev, "txco"); 974 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 975 return clk; 976 977 /* Deprecated name */ 978 clk = devm_clk_get(dev, "extclk"); 979 if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER) 980 return clk; 981 982 /* Original code used no name at all */ 983 return devm_clk_get(dev, NULL); 984 } 985 986 static int bcm_get_resources(struct bcm_device *dev) 987 { 988 const struct dmi_system_id *dmi_id; 989 int err; 990 991 dev->name = dev_name(dev->dev); 992 993 if (x86_apple_machine && !bcm_apple_get_resources(dev)) 994 return 0; 995 996 dev->txco_clk = bcm_get_txco(dev->dev); 997 998 /* Handle deferred probing */ 999 if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER)) 1000 return PTR_ERR(dev->txco_clk); 1001 1002 /* Ignore all other errors as before */ 1003 if (IS_ERR(dev->txco_clk)) 1004 dev->txco_clk = NULL; 1005 1006 dev->lpo_clk = devm_clk_get(dev->dev, "lpo"); 1007 if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER)) 1008 return PTR_ERR(dev->lpo_clk); 1009 1010 if (IS_ERR(dev->lpo_clk)) 1011 dev->lpo_clk = NULL; 1012 1013 /* Check if we accidentally fetched the lpo clock twice */ 1014 if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) { 1015 devm_clk_put(dev->dev, dev->txco_clk); 1016 dev->txco_clk = NULL; 1017 } 1018 1019 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup", 1020 GPIOD_OUT_LOW); 1021 if (IS_ERR(dev->device_wakeup)) 1022 return PTR_ERR(dev->device_wakeup); 1023 1024 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown", 1025 GPIOD_OUT_LOW); 1026 if (IS_ERR(dev->shutdown)) 1027 return PTR_ERR(dev->shutdown); 1028 1029 dev->set_device_wakeup = bcm_gpio_set_device_wakeup; 1030 dev->set_shutdown = bcm_gpio_set_shutdown; 1031 1032 dev->supplies[0].supply = "vbat"; 1033 dev->supplies[1].supply = "vddio"; 1034 err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES, 1035 dev->supplies); 1036 if (err) 1037 return err; 1038 1039 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 1040 if (dev->irq <= 0) { 1041 struct gpio_desc *gpio; 1042 1043 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup", 1044 GPIOD_IN); 1045 if (IS_ERR(gpio)) 1046 return PTR_ERR(gpio); 1047 1048 dev->irq = gpiod_to_irq(gpio); 1049 } 1050 1051 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table); 1052 if (dmi_id) { 1053 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n", 1054 dmi_id->ident); 1055 dev->irq = 0; 1056 } 1057 1058 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq); 1059 return 0; 1060 } 1061 1062 #ifdef CONFIG_ACPI 1063 static int bcm_acpi_probe(struct bcm_device *dev) 1064 { 1065 LIST_HEAD(resources); 1066 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; 1067 struct resource_entry *entry; 1068 int ret; 1069 1070 /* Retrieve UART ACPI info */ 1071 dev->gpio_int_idx = -1; 1072 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev), 1073 &resources, bcm_resource, dev); 1074 if (ret < 0) 1075 return ret; 1076 1077 resource_list_for_each_entry(entry, &resources) { 1078 if (resource_type(entry->res) == IORESOURCE_IRQ) { 1079 dev->irq = entry->res->start; 1080 break; 1081 } 1082 } 1083 acpi_dev_free_resource_list(&resources); 1084 1085 /* If the DSDT uses an Interrupt resource for the IRQ, then there are 1086 * only 2 GPIO resources, we use the irq-last mapping for this, since 1087 * we already have an irq the 3th / last mapping will not be used. 1088 */ 1089 if (dev->irq) 1090 gpio_mapping = acpi_bcm_int_last_gpios; 1091 else if (dev->gpio_int_idx == 0) 1092 gpio_mapping = acpi_bcm_int_first_gpios; 1093 else if (dev->gpio_int_idx == 2) 1094 gpio_mapping = acpi_bcm_int_last_gpios; 1095 else 1096 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n", 1097 dev->gpio_int_idx); 1098 1099 /* Warn if our expectations are not met. */ 1100 if (dev->gpio_count != (dev->irq ? 2 : 3)) 1101 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n", 1102 dev->gpio_count); 1103 1104 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping); 1105 if (ret) 1106 return ret; 1107 1108 if (irq_polarity != -1) { 1109 dev->irq_active_low = irq_polarity; 1110 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n", 1111 dev->irq_active_low ? "low" : "high"); 1112 } 1113 1114 return 0; 1115 } 1116 #else 1117 static int bcm_acpi_probe(struct bcm_device *dev) 1118 { 1119 return -EINVAL; 1120 } 1121 #endif /* CONFIG_ACPI */ 1122 1123 static int bcm_of_probe(struct bcm_device *bdev) 1124 { 1125 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed); 1126 return 0; 1127 } 1128 1129 static int bcm_probe(struct platform_device *pdev) 1130 { 1131 struct bcm_device *dev; 1132 int ret; 1133 1134 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 1135 if (!dev) 1136 return -ENOMEM; 1137 1138 dev->dev = &pdev->dev; 1139 dev->irq = platform_get_irq(pdev, 0); 1140 1141 if (has_acpi_companion(&pdev->dev)) { 1142 ret = bcm_acpi_probe(dev); 1143 if (ret) 1144 return ret; 1145 } 1146 1147 ret = bcm_get_resources(dev); 1148 if (ret) 1149 return ret; 1150 1151 platform_set_drvdata(pdev, dev); 1152 1153 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 1154 1155 /* Place this instance on the device list */ 1156 mutex_lock(&bcm_device_lock); 1157 list_add_tail(&dev->list, &bcm_device_list); 1158 mutex_unlock(&bcm_device_lock); 1159 1160 ret = bcm_gpio_set_power(dev, false); 1161 if (ret) 1162 dev_err(&pdev->dev, "Failed to power down\n"); 1163 1164 return 0; 1165 } 1166 1167 static int bcm_remove(struct platform_device *pdev) 1168 { 1169 struct bcm_device *dev = platform_get_drvdata(pdev); 1170 1171 mutex_lock(&bcm_device_lock); 1172 list_del(&dev->list); 1173 mutex_unlock(&bcm_device_lock); 1174 1175 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 1176 1177 return 0; 1178 } 1179 1180 static const struct hci_uart_proto bcm_proto = { 1181 .id = HCI_UART_BCM, 1182 .name = "Broadcom", 1183 .manufacturer = 15, 1184 .init_speed = 115200, 1185 .open = bcm_open, 1186 .close = bcm_close, 1187 .flush = bcm_flush, 1188 .setup = bcm_setup, 1189 .set_baudrate = bcm_set_baudrate, 1190 .recv = bcm_recv, 1191 .enqueue = bcm_enqueue, 1192 .dequeue = bcm_dequeue, 1193 }; 1194 1195 #ifdef CONFIG_ACPI 1196 static const struct acpi_device_id bcm_acpi_match[] = { 1197 { "BCM2E00" }, 1198 { "BCM2E01" }, 1199 { "BCM2E02" }, 1200 { "BCM2E03" }, 1201 { "BCM2E04" }, 1202 { "BCM2E05" }, 1203 { "BCM2E06" }, 1204 { "BCM2E07" }, 1205 { "BCM2E08" }, 1206 { "BCM2E09" }, 1207 { "BCM2E0A" }, 1208 { "BCM2E0B" }, 1209 { "BCM2E0C" }, 1210 { "BCM2E0D" }, 1211 { "BCM2E0E" }, 1212 { "BCM2E0F" }, 1213 { "BCM2E10" }, 1214 { "BCM2E11" }, 1215 { "BCM2E12" }, 1216 { "BCM2E13" }, 1217 { "BCM2E14" }, 1218 { "BCM2E15" }, 1219 { "BCM2E16" }, 1220 { "BCM2E17" }, 1221 { "BCM2E18" }, 1222 { "BCM2E19" }, 1223 { "BCM2E1A" }, 1224 { "BCM2E1B" }, 1225 { "BCM2E1C" }, 1226 { "BCM2E1D" }, 1227 { "BCM2E1F" }, 1228 { "BCM2E20" }, 1229 { "BCM2E21" }, 1230 { "BCM2E22" }, 1231 { "BCM2E23" }, 1232 { "BCM2E24" }, 1233 { "BCM2E25" }, 1234 { "BCM2E26" }, 1235 { "BCM2E27" }, 1236 { "BCM2E28" }, 1237 { "BCM2E29" }, 1238 { "BCM2E2A" }, 1239 { "BCM2E2B" }, 1240 { "BCM2E2C" }, 1241 { "BCM2E2D" }, 1242 { "BCM2E2E" }, 1243 { "BCM2E2F" }, 1244 { "BCM2E30" }, 1245 { "BCM2E31" }, 1246 { "BCM2E32" }, 1247 { "BCM2E33" }, 1248 { "BCM2E34" }, 1249 { "BCM2E35" }, 1250 { "BCM2E36" }, 1251 { "BCM2E37" }, 1252 { "BCM2E38" }, 1253 { "BCM2E39" }, 1254 { "BCM2E3A" }, 1255 { "BCM2E3B" }, 1256 { "BCM2E3C" }, 1257 { "BCM2E3D" }, 1258 { "BCM2E3E" }, 1259 { "BCM2E3F" }, 1260 { "BCM2E40" }, 1261 { "BCM2E41" }, 1262 { "BCM2E42" }, 1263 { "BCM2E43" }, 1264 { "BCM2E44" }, 1265 { "BCM2E45" }, 1266 { "BCM2E46" }, 1267 { "BCM2E47" }, 1268 { "BCM2E48" }, 1269 { "BCM2E49" }, 1270 { "BCM2E4A" }, 1271 { "BCM2E4B" }, 1272 { "BCM2E4C" }, 1273 { "BCM2E4D" }, 1274 { "BCM2E4E" }, 1275 { "BCM2E4F" }, 1276 { "BCM2E50" }, 1277 { "BCM2E51" }, 1278 { "BCM2E52" }, 1279 { "BCM2E53" }, 1280 { "BCM2E54" }, 1281 { "BCM2E55" }, 1282 { "BCM2E56" }, 1283 { "BCM2E57" }, 1284 { "BCM2E58" }, 1285 { "BCM2E59" }, 1286 { "BCM2E5A" }, 1287 { "BCM2E5B" }, 1288 { "BCM2E5C" }, 1289 { "BCM2E5D" }, 1290 { "BCM2E5E" }, 1291 { "BCM2E5F" }, 1292 { "BCM2E60" }, 1293 { "BCM2E61" }, 1294 { "BCM2E62" }, 1295 { "BCM2E63" }, 1296 { "BCM2E64" }, 1297 { "BCM2E65" }, 1298 { "BCM2E66" }, 1299 { "BCM2E67" }, 1300 { "BCM2E68" }, 1301 { "BCM2E69" }, 1302 { "BCM2E6B" }, 1303 { "BCM2E6D" }, 1304 { "BCM2E6E" }, 1305 { "BCM2E6F" }, 1306 { "BCM2E70" }, 1307 { "BCM2E71" }, 1308 { "BCM2E72" }, 1309 { "BCM2E73" }, 1310 { "BCM2E74" }, 1311 { "BCM2E75" }, 1312 { "BCM2E76" }, 1313 { "BCM2E77" }, 1314 { "BCM2E78" }, 1315 { "BCM2E79" }, 1316 { "BCM2E7A" }, 1317 { "BCM2E7B" }, 1318 { "BCM2E7C" }, 1319 { "BCM2E7D" }, 1320 { "BCM2E7E" }, 1321 { "BCM2E7F" }, 1322 { "BCM2E80" }, 1323 { "BCM2E81" }, 1324 { "BCM2E82" }, 1325 { "BCM2E83" }, 1326 { "BCM2E84" }, 1327 { "BCM2E85" }, 1328 { "BCM2E86" }, 1329 { "BCM2E87" }, 1330 { "BCM2E88" }, 1331 { "BCM2E89" }, 1332 { "BCM2E8A" }, 1333 { "BCM2E8B" }, 1334 { "BCM2E8C" }, 1335 { "BCM2E8D" }, 1336 { "BCM2E8E" }, 1337 { "BCM2E90" }, 1338 { "BCM2E92" }, 1339 { "BCM2E93" }, 1340 { "BCM2E94" }, 1341 { "BCM2E95" }, 1342 { "BCM2E96" }, 1343 { "BCM2E97" }, 1344 { "BCM2E98" }, 1345 { "BCM2E99" }, 1346 { "BCM2E9A" }, 1347 { "BCM2E9B" }, 1348 { "BCM2E9C" }, 1349 { "BCM2E9D" }, 1350 { "BCM2EA0" }, 1351 { "BCM2EA1" }, 1352 { "BCM2EA2" }, 1353 { "BCM2EA3" }, 1354 { "BCM2EA4" }, 1355 { "BCM2EA5" }, 1356 { "BCM2EA6" }, 1357 { "BCM2EA7" }, 1358 { "BCM2EA8" }, 1359 { "BCM2EA9" }, 1360 { "BCM2EAA" }, 1361 { "BCM2EAB" }, 1362 { "BCM2EAC" }, 1363 { }, 1364 }; 1365 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 1366 #endif 1367 1368 /* suspend and resume callbacks */ 1369 static const struct dev_pm_ops bcm_pm_ops = { 1370 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 1371 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 1372 }; 1373 1374 static struct platform_driver bcm_driver = { 1375 .probe = bcm_probe, 1376 .remove = bcm_remove, 1377 .driver = { 1378 .name = "hci_bcm", 1379 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1380 .pm = &bcm_pm_ops, 1381 }, 1382 }; 1383 1384 static int bcm_serdev_probe(struct serdev_device *serdev) 1385 { 1386 struct bcm_device *bcmdev; 1387 int err; 1388 1389 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL); 1390 if (!bcmdev) 1391 return -ENOMEM; 1392 1393 bcmdev->dev = &serdev->dev; 1394 #ifdef CONFIG_PM 1395 bcmdev->hu = &bcmdev->serdev_hu; 1396 #endif 1397 bcmdev->serdev_hu.serdev = serdev; 1398 serdev_device_set_drvdata(serdev, bcmdev); 1399 1400 if (has_acpi_companion(&serdev->dev)) 1401 err = bcm_acpi_probe(bcmdev); 1402 else 1403 err = bcm_of_probe(bcmdev); 1404 if (err) 1405 return err; 1406 1407 err = bcm_get_resources(bcmdev); 1408 if (err) 1409 return err; 1410 1411 if (!bcmdev->shutdown) { 1412 dev_warn(&serdev->dev, 1413 "No reset resource, using default baud rate\n"); 1414 bcmdev->oper_speed = bcmdev->init_speed; 1415 } 1416 1417 err = bcm_gpio_set_power(bcmdev, false); 1418 if (err) 1419 dev_err(&serdev->dev, "Failed to power down\n"); 1420 1421 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto); 1422 } 1423 1424 static void bcm_serdev_remove(struct serdev_device *serdev) 1425 { 1426 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev); 1427 1428 hci_uart_unregister_device(&bcmdev->serdev_hu); 1429 } 1430 1431 #ifdef CONFIG_OF 1432 static const struct of_device_id bcm_bluetooth_of_match[] = { 1433 { .compatible = "brcm,bcm20702a1" }, 1434 { .compatible = "brcm,bcm4330-bt" }, 1435 { .compatible = "brcm,bcm43438-bt" }, 1436 { }, 1437 }; 1438 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match); 1439 #endif 1440 1441 static struct serdev_device_driver bcm_serdev_driver = { 1442 .probe = bcm_serdev_probe, 1443 .remove = bcm_serdev_remove, 1444 .driver = { 1445 .name = "hci_uart_bcm", 1446 .of_match_table = of_match_ptr(bcm_bluetooth_of_match), 1447 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 1448 .pm = &bcm_pm_ops, 1449 }, 1450 }; 1451 1452 int __init bcm_init(void) 1453 { 1454 /* For now, we need to keep both platform device 1455 * driver (ACPI generated) and serdev driver (DT). 1456 */ 1457 platform_driver_register(&bcm_driver); 1458 serdev_device_driver_register(&bcm_serdev_driver); 1459 1460 return hci_uart_register_proto(&bcm_proto); 1461 } 1462 1463 int __exit bcm_deinit(void) 1464 { 1465 platform_driver_unregister(&bcm_driver); 1466 serdev_device_driver_unregister(&bcm_serdev_driver); 1467 1468 return hci_uart_unregister_proto(&bcm_proto); 1469 } 1470