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_device.h> 33 #include <linux/clk.h> 34 #include <linux/gpio/consumer.h> 35 #include <linux/tty.h> 36 #include <linux/interrupt.h> 37 #include <linux/dmi.h> 38 #include <linux/pm_runtime.h> 39 #include <linux/serdev.h> 40 41 #include <net/bluetooth/bluetooth.h> 42 #include <net/bluetooth/hci_core.h> 43 44 #include "btbcm.h" 45 #include "hci_uart.h" 46 47 #define BCM_NULL_PKT 0x00 48 #define BCM_NULL_SIZE 0 49 50 #define BCM_LM_DIAG_PKT 0x07 51 #define BCM_LM_DIAG_SIZE 63 52 53 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ 54 55 /* platform device driver resources */ 56 struct bcm_device { 57 struct list_head list; 58 59 struct platform_device *pdev; 60 61 const char *name; 62 struct gpio_desc *device_wakeup; 63 struct gpio_desc *shutdown; 64 65 struct clk *clk; 66 bool clk_enabled; 67 68 u32 init_speed; 69 u32 oper_speed; 70 int irq; 71 u8 irq_polarity; 72 73 #ifdef CONFIG_PM 74 struct hci_uart *hu; 75 bool is_suspended; /* suspend/resume flag */ 76 #endif 77 }; 78 79 /* serdev driver resources */ 80 struct bcm_serdev { 81 struct hci_uart hu; 82 }; 83 84 /* generic bcm uart resources */ 85 struct bcm_data { 86 struct sk_buff *rx_skb; 87 struct sk_buff_head txq; 88 89 struct bcm_device *dev; 90 }; 91 92 /* List of BCM BT UART devices */ 93 static DEFINE_MUTEX(bcm_device_lock); 94 static LIST_HEAD(bcm_device_list); 95 96 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) 97 { 98 if (hu->serdev) 99 serdev_device_set_baudrate(hu->serdev, speed); 100 else 101 hci_uart_set_baudrate(hu, speed); 102 } 103 104 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) 105 { 106 struct hci_dev *hdev = hu->hdev; 107 struct sk_buff *skb; 108 struct bcm_update_uart_baud_rate param; 109 110 if (speed > 3000000) { 111 struct bcm_write_uart_clock_setting clock; 112 113 clock.type = BCM_UART_CLOCK_48MHZ; 114 115 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type); 116 117 /* This Broadcom specific command changes the UART's controller 118 * clock for baud rate > 3000000. 119 */ 120 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); 121 if (IS_ERR(skb)) { 122 int err = PTR_ERR(skb); 123 bt_dev_err(hdev, "BCM: failed to write clock (%d)", 124 err); 125 return err; 126 } 127 128 kfree_skb(skb); 129 } 130 131 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed); 132 133 param.zero = cpu_to_le16(0); 134 param.baud_rate = cpu_to_le32(speed); 135 136 /* This Broadcom specific command changes the UART's controller baud 137 * rate. 138 */ 139 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, 140 HCI_INIT_TIMEOUT); 141 if (IS_ERR(skb)) { 142 int err = PTR_ERR(skb); 143 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)", 144 err); 145 return err; 146 } 147 148 kfree_skb(skb); 149 150 return 0; 151 } 152 153 /* bcm_device_exists should be protected by bcm_device_lock */ 154 static bool bcm_device_exists(struct bcm_device *device) 155 { 156 struct list_head *p; 157 158 list_for_each(p, &bcm_device_list) { 159 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 160 161 if (device == dev) 162 return true; 163 } 164 165 return false; 166 } 167 168 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) 169 { 170 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) 171 clk_prepare_enable(dev->clk); 172 173 gpiod_set_value(dev->shutdown, powered); 174 gpiod_set_value(dev->device_wakeup, powered); 175 176 if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled) 177 clk_disable_unprepare(dev->clk); 178 179 dev->clk_enabled = powered; 180 181 return 0; 182 } 183 184 #ifdef CONFIG_PM 185 static irqreturn_t bcm_host_wake(int irq, void *data) 186 { 187 struct bcm_device *bdev = data; 188 189 bt_dev_dbg(bdev, "Host wake IRQ"); 190 191 pm_runtime_get(&bdev->pdev->dev); 192 pm_runtime_mark_last_busy(&bdev->pdev->dev); 193 pm_runtime_put_autosuspend(&bdev->pdev->dev); 194 195 return IRQ_HANDLED; 196 } 197 198 static int bcm_request_irq(struct bcm_data *bcm) 199 { 200 struct bcm_device *bdev = bcm->dev; 201 int err; 202 203 /* If this is not a platform device, do not enable PM functionalities */ 204 mutex_lock(&bcm_device_lock); 205 if (!bcm_device_exists(bdev)) { 206 err = -ENODEV; 207 goto unlock; 208 } 209 210 if (bdev->irq <= 0) { 211 err = -EOPNOTSUPP; 212 goto unlock; 213 } 214 215 err = devm_request_irq(&bdev->pdev->dev, bdev->irq, bcm_host_wake, 216 IRQF_TRIGGER_RISING, "host_wake", bdev); 217 if (err) 218 goto unlock; 219 220 device_init_wakeup(&bdev->pdev->dev, true); 221 222 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev, 223 BCM_AUTOSUSPEND_DELAY); 224 pm_runtime_use_autosuspend(&bdev->pdev->dev); 225 pm_runtime_set_active(&bdev->pdev->dev); 226 pm_runtime_enable(&bdev->pdev->dev); 227 228 unlock: 229 mutex_unlock(&bcm_device_lock); 230 231 return err; 232 } 233 234 static const struct bcm_set_sleep_mode default_sleep_params = { 235 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */ 236 .idle_host = 2, /* idle threshold HOST, in 300ms */ 237 .idle_dev = 2, /* idle threshold device, in 300ms */ 238 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */ 239 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */ 240 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */ 241 .combine_modes = 1, /* Combine sleep and LPM flag */ 242 .tristate_control = 0, /* Allow tri-state control of UART tx flag */ 243 /* Irrelevant USB flags */ 244 .usb_auto_sleep = 0, 245 .usb_resume_timeout = 0, 246 .pulsed_host_wake = 0, 247 .break_to_host = 0 248 }; 249 250 static int bcm_setup_sleep(struct hci_uart *hu) 251 { 252 struct bcm_data *bcm = hu->priv; 253 struct sk_buff *skb; 254 struct bcm_set_sleep_mode sleep_params = default_sleep_params; 255 256 sleep_params.host_wake_active = !bcm->dev->irq_polarity; 257 258 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params), 259 &sleep_params, HCI_INIT_TIMEOUT); 260 if (IS_ERR(skb)) { 261 int err = PTR_ERR(skb); 262 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err); 263 return err; 264 } 265 kfree_skb(skb); 266 267 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded"); 268 269 return 0; 270 } 271 #else 272 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; } 273 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; } 274 #endif 275 276 static int bcm_set_diag(struct hci_dev *hdev, bool enable) 277 { 278 struct hci_uart *hu = hci_get_drvdata(hdev); 279 struct bcm_data *bcm = hu->priv; 280 struct sk_buff *skb; 281 282 if (!test_bit(HCI_RUNNING, &hdev->flags)) 283 return -ENETDOWN; 284 285 skb = bt_skb_alloc(3, GFP_KERNEL); 286 if (!skb) 287 return -ENOMEM; 288 289 skb_put_u8(skb, BCM_LM_DIAG_PKT); 290 skb_put_u8(skb, 0xf0); 291 skb_put_u8(skb, enable); 292 293 skb_queue_tail(&bcm->txq, skb); 294 hci_uart_tx_wakeup(hu); 295 296 return 0; 297 } 298 299 static int bcm_open(struct hci_uart *hu) 300 { 301 struct bcm_data *bcm; 302 struct list_head *p; 303 304 bt_dev_dbg(hu->hdev, "hu %p", hu); 305 306 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); 307 if (!bcm) 308 return -ENOMEM; 309 310 skb_queue_head_init(&bcm->txq); 311 312 hu->priv = bcm; 313 314 /* If this is a serdev defined device, then only use 315 * serdev open primitive and skip the rest. 316 */ 317 if (hu->serdev) { 318 serdev_device_open(hu->serdev); 319 goto out; 320 } 321 322 if (!hu->tty->dev) 323 goto out; 324 325 mutex_lock(&bcm_device_lock); 326 list_for_each(p, &bcm_device_list) { 327 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 328 329 /* Retrieve saved bcm_device based on parent of the 330 * platform device (saved during device probe) and 331 * parent of tty device used by hci_uart 332 */ 333 if (hu->tty->dev->parent == dev->pdev->dev.parent) { 334 bcm->dev = dev; 335 hu->init_speed = dev->init_speed; 336 hu->oper_speed = dev->oper_speed; 337 #ifdef CONFIG_PM 338 dev->hu = hu; 339 #endif 340 bcm_gpio_set_power(bcm->dev, true); 341 break; 342 } 343 } 344 345 mutex_unlock(&bcm_device_lock); 346 out: 347 return 0; 348 } 349 350 static int bcm_close(struct hci_uart *hu) 351 { 352 struct bcm_data *bcm = hu->priv; 353 struct bcm_device *bdev = bcm->dev; 354 355 bt_dev_dbg(hu->hdev, "hu %p", hu); 356 357 /* If this is a serdev defined device, only use serdev 358 * close primitive and then continue as usual. 359 */ 360 if (hu->serdev) 361 serdev_device_close(hu->serdev); 362 363 /* Protect bcm->dev against removal of the device or driver */ 364 mutex_lock(&bcm_device_lock); 365 if (bcm_device_exists(bdev)) { 366 bcm_gpio_set_power(bdev, false); 367 #ifdef CONFIG_PM 368 pm_runtime_disable(&bdev->pdev->dev); 369 pm_runtime_set_suspended(&bdev->pdev->dev); 370 371 if (device_can_wakeup(&bdev->pdev->dev)) { 372 devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev); 373 device_init_wakeup(&bdev->pdev->dev, false); 374 } 375 376 bdev->hu = NULL; 377 #endif 378 } 379 mutex_unlock(&bcm_device_lock); 380 381 skb_queue_purge(&bcm->txq); 382 kfree_skb(bcm->rx_skb); 383 kfree(bcm); 384 385 hu->priv = NULL; 386 return 0; 387 } 388 389 static int bcm_flush(struct hci_uart *hu) 390 { 391 struct bcm_data *bcm = hu->priv; 392 393 bt_dev_dbg(hu->hdev, "hu %p", hu); 394 395 skb_queue_purge(&bcm->txq); 396 397 return 0; 398 } 399 400 static int bcm_setup(struct hci_uart *hu) 401 { 402 struct bcm_data *bcm = hu->priv; 403 char fw_name[64]; 404 const struct firmware *fw; 405 unsigned int speed; 406 int err; 407 408 bt_dev_dbg(hu->hdev, "hu %p", hu); 409 410 hu->hdev->set_diag = bcm_set_diag; 411 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 412 413 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name)); 414 if (err) 415 return err; 416 417 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 418 if (err < 0) { 419 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 420 return 0; 421 } 422 423 err = btbcm_patchram(hu->hdev, fw); 424 if (err) { 425 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 426 goto finalize; 427 } 428 429 /* Init speed if any */ 430 if (hu->init_speed) 431 speed = hu->init_speed; 432 else if (hu->proto->init_speed) 433 speed = hu->proto->init_speed; 434 else 435 speed = 0; 436 437 if (speed) 438 host_set_baudrate(hu, speed); 439 440 /* Operational speed if any */ 441 if (hu->oper_speed) 442 speed = hu->oper_speed; 443 else if (hu->proto->oper_speed) 444 speed = hu->proto->oper_speed; 445 else 446 speed = 0; 447 448 if (speed) { 449 err = bcm_set_baudrate(hu, speed); 450 if (!err) 451 host_set_baudrate(hu, speed); 452 } 453 454 finalize: 455 release_firmware(fw); 456 457 err = btbcm_finalize(hu->hdev); 458 if (err) 459 return err; 460 461 if (!bcm_request_irq(bcm)) 462 err = bcm_setup_sleep(hu); 463 464 return err; 465 } 466 467 #define BCM_RECV_LM_DIAG \ 468 .type = BCM_LM_DIAG_PKT, \ 469 .hlen = BCM_LM_DIAG_SIZE, \ 470 .loff = 0, \ 471 .lsize = 0, \ 472 .maxlen = BCM_LM_DIAG_SIZE 473 474 #define BCM_RECV_NULL \ 475 .type = BCM_NULL_PKT, \ 476 .hlen = BCM_NULL_SIZE, \ 477 .loff = 0, \ 478 .lsize = 0, \ 479 .maxlen = BCM_NULL_SIZE 480 481 static const struct h4_recv_pkt bcm_recv_pkts[] = { 482 { H4_RECV_ACL, .recv = hci_recv_frame }, 483 { H4_RECV_SCO, .recv = hci_recv_frame }, 484 { H4_RECV_EVENT, .recv = hci_recv_frame }, 485 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 486 { BCM_RECV_NULL, .recv = hci_recv_diag }, 487 }; 488 489 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 490 { 491 struct bcm_data *bcm = hu->priv; 492 493 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 494 return -EUNATCH; 495 496 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 497 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 498 if (IS_ERR(bcm->rx_skb)) { 499 int err = PTR_ERR(bcm->rx_skb); 500 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 501 bcm->rx_skb = NULL; 502 return err; 503 } else if (!bcm->rx_skb) { 504 /* Delay auto-suspend when receiving completed packet */ 505 mutex_lock(&bcm_device_lock); 506 if (bcm->dev && bcm_device_exists(bcm->dev)) { 507 pm_runtime_get(&bcm->dev->pdev->dev); 508 pm_runtime_mark_last_busy(&bcm->dev->pdev->dev); 509 pm_runtime_put_autosuspend(&bcm->dev->pdev->dev); 510 } 511 mutex_unlock(&bcm_device_lock); 512 } 513 514 return count; 515 } 516 517 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 518 { 519 struct bcm_data *bcm = hu->priv; 520 521 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 522 523 /* Prepend skb with frame type */ 524 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 525 skb_queue_tail(&bcm->txq, skb); 526 527 return 0; 528 } 529 530 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 531 { 532 struct bcm_data *bcm = hu->priv; 533 struct sk_buff *skb = NULL; 534 struct bcm_device *bdev = NULL; 535 536 mutex_lock(&bcm_device_lock); 537 538 if (bcm_device_exists(bcm->dev)) { 539 bdev = bcm->dev; 540 pm_runtime_get_sync(&bdev->pdev->dev); 541 /* Shall be resumed here */ 542 } 543 544 skb = skb_dequeue(&bcm->txq); 545 546 if (bdev) { 547 pm_runtime_mark_last_busy(&bdev->pdev->dev); 548 pm_runtime_put_autosuspend(&bdev->pdev->dev); 549 } 550 551 mutex_unlock(&bcm_device_lock); 552 553 return skb; 554 } 555 556 #ifdef CONFIG_PM 557 static int bcm_suspend_device(struct device *dev) 558 { 559 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 560 561 bt_dev_dbg(bdev, ""); 562 563 if (!bdev->is_suspended && bdev->hu) { 564 hci_uart_set_flow_control(bdev->hu, true); 565 566 /* Once this returns, driver suspends BT via GPIO */ 567 bdev->is_suspended = true; 568 } 569 570 /* Suspend the device */ 571 if (bdev->device_wakeup) { 572 gpiod_set_value(bdev->device_wakeup, false); 573 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 574 mdelay(15); 575 } 576 577 return 0; 578 } 579 580 static int bcm_resume_device(struct device *dev) 581 { 582 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 583 584 bt_dev_dbg(bdev, ""); 585 586 if (bdev->device_wakeup) { 587 gpiod_set_value(bdev->device_wakeup, true); 588 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 589 mdelay(15); 590 } 591 592 /* When this executes, the device has woken up already */ 593 if (bdev->is_suspended && bdev->hu) { 594 bdev->is_suspended = false; 595 596 hci_uart_set_flow_control(bdev->hu, false); 597 } 598 599 return 0; 600 } 601 #endif 602 603 #ifdef CONFIG_PM_SLEEP 604 /* Platform suspend callback */ 605 static int bcm_suspend(struct device *dev) 606 { 607 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 608 int error; 609 610 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 611 612 /* bcm_suspend can be called at any time as long as platform device is 613 * bound, so it should use bcm_device_lock to protect access to hci_uart 614 * and device_wake-up GPIO. 615 */ 616 mutex_lock(&bcm_device_lock); 617 618 if (!bdev->hu) 619 goto unlock; 620 621 if (pm_runtime_active(dev)) 622 bcm_suspend_device(dev); 623 624 if (device_may_wakeup(&bdev->pdev->dev)) { 625 error = enable_irq_wake(bdev->irq); 626 if (!error) 627 bt_dev_dbg(bdev, "BCM irq: enabled"); 628 } 629 630 unlock: 631 mutex_unlock(&bcm_device_lock); 632 633 return 0; 634 } 635 636 /* Platform resume callback */ 637 static int bcm_resume(struct device *dev) 638 { 639 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 640 641 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 642 643 /* bcm_resume can be called at any time as long as platform device is 644 * bound, so it should use bcm_device_lock to protect access to hci_uart 645 * and device_wake-up GPIO. 646 */ 647 mutex_lock(&bcm_device_lock); 648 649 if (!bdev->hu) 650 goto unlock; 651 652 if (device_may_wakeup(&bdev->pdev->dev)) { 653 disable_irq_wake(bdev->irq); 654 bt_dev_dbg(bdev, "BCM irq: disabled"); 655 } 656 657 bcm_resume_device(dev); 658 659 unlock: 660 mutex_unlock(&bcm_device_lock); 661 662 pm_runtime_disable(dev); 663 pm_runtime_set_active(dev); 664 pm_runtime_enable(dev); 665 666 return 0; 667 } 668 #endif 669 670 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false }; 671 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false }; 672 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false }; 673 674 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 675 { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 }, 676 { "shutdown-gpios", &int_last_shutdown_gpios, 1 }, 677 { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 }, 678 { }, 679 }; 680 681 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false }; 682 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false }; 683 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false }; 684 685 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 686 { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 }, 687 { "shutdown-gpios", &int_first_shutdown_gpios, 1 }, 688 { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 }, 689 { }, 690 }; 691 692 #ifdef CONFIG_ACPI 693 static u8 acpi_active_low = ACPI_ACTIVE_LOW; 694 695 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */ 696 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = { 697 { 698 .ident = "Asus T100TA", 699 .matches = { 700 DMI_EXACT_MATCH(DMI_SYS_VENDOR, 701 "ASUSTeK COMPUTER INC."), 702 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"), 703 }, 704 .driver_data = &acpi_active_low, 705 }, 706 { 707 .ident = "Asus T100CHI", 708 .matches = { 709 DMI_EXACT_MATCH(DMI_SYS_VENDOR, 710 "ASUSTeK COMPUTER INC."), 711 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"), 712 }, 713 .driver_data = &acpi_active_low, 714 }, 715 { /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */ 716 .ident = "Lenovo ThinkPad 8", 717 .matches = { 718 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"), 719 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"), 720 }, 721 .driver_data = &acpi_active_low, 722 }, 723 { } 724 }; 725 726 static int bcm_resource(struct acpi_resource *ares, void *data) 727 { 728 struct bcm_device *dev = data; 729 struct acpi_resource_extended_irq *irq; 730 struct acpi_resource_gpio *gpio; 731 struct acpi_resource_uart_serialbus *sb; 732 733 switch (ares->type) { 734 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 735 irq = &ares->data.extended_irq; 736 dev->irq_polarity = irq->polarity; 737 break; 738 739 case ACPI_RESOURCE_TYPE_GPIO: 740 gpio = &ares->data.gpio; 741 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) 742 dev->irq_polarity = gpio->polarity; 743 break; 744 745 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 746 sb = &ares->data.uart_serial_bus; 747 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { 748 dev->init_speed = sb->default_baud_rate; 749 dev->oper_speed = 4000000; 750 } 751 break; 752 753 default: 754 break; 755 } 756 757 /* Always tell the ACPI core to skip this resource */ 758 return 1; 759 } 760 #endif /* CONFIG_ACPI */ 761 762 static int bcm_platform_probe(struct bcm_device *dev) 763 { 764 struct platform_device *pdev = dev->pdev; 765 766 dev->name = dev_name(&pdev->dev); 767 768 dev->clk = devm_clk_get(&pdev->dev, NULL); 769 770 dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev, 771 "device-wakeup", 772 GPIOD_OUT_LOW); 773 if (IS_ERR(dev->device_wakeup)) 774 return PTR_ERR(dev->device_wakeup); 775 776 dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown", 777 GPIOD_OUT_LOW); 778 if (IS_ERR(dev->shutdown)) 779 return PTR_ERR(dev->shutdown); 780 781 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 782 dev->irq = platform_get_irq(pdev, 0); 783 if (dev->irq <= 0) { 784 struct gpio_desc *gpio; 785 786 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup", 787 GPIOD_IN); 788 if (IS_ERR(gpio)) 789 return PTR_ERR(gpio); 790 791 dev->irq = gpiod_to_irq(gpio); 792 } 793 794 dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq); 795 796 /* Make sure at-least one of the GPIO is defined and that 797 * a name is specified for this instance 798 */ 799 if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) { 800 dev_err(&pdev->dev, "invalid platform data\n"); 801 return -EINVAL; 802 } 803 804 return 0; 805 } 806 807 #ifdef CONFIG_ACPI 808 static int bcm_acpi_probe(struct bcm_device *dev) 809 { 810 struct platform_device *pdev = dev->pdev; 811 LIST_HEAD(resources); 812 const struct dmi_system_id *dmi_id; 813 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; 814 const struct acpi_device_id *id; 815 int ret; 816 817 /* Retrieve GPIO data */ 818 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); 819 if (id) 820 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data; 821 822 ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping); 823 if (ret) 824 return ret; 825 826 ret = bcm_platform_probe(dev); 827 if (ret) 828 return ret; 829 830 /* Retrieve UART ACPI info */ 831 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev), 832 &resources, bcm_resource, dev); 833 if (ret < 0) 834 return ret; 835 acpi_dev_free_resource_list(&resources); 836 837 dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table); 838 if (dmi_id) { 839 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low", 840 dmi_id->ident); 841 dev->irq_polarity = *(u8 *)dmi_id->driver_data; 842 } 843 844 return 0; 845 } 846 #else 847 static int bcm_acpi_probe(struct bcm_device *dev) 848 { 849 return -EINVAL; 850 } 851 #endif /* CONFIG_ACPI */ 852 853 static int bcm_probe(struct platform_device *pdev) 854 { 855 struct bcm_device *dev; 856 int ret; 857 858 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 859 if (!dev) 860 return -ENOMEM; 861 862 dev->pdev = pdev; 863 864 if (has_acpi_companion(&pdev->dev)) 865 ret = bcm_acpi_probe(dev); 866 else 867 ret = bcm_platform_probe(dev); 868 if (ret) 869 return ret; 870 871 platform_set_drvdata(pdev, dev); 872 873 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 874 875 /* Place this instance on the device list */ 876 mutex_lock(&bcm_device_lock); 877 list_add_tail(&dev->list, &bcm_device_list); 878 mutex_unlock(&bcm_device_lock); 879 880 bcm_gpio_set_power(dev, false); 881 882 return 0; 883 } 884 885 static int bcm_remove(struct platform_device *pdev) 886 { 887 struct bcm_device *dev = platform_get_drvdata(pdev); 888 889 mutex_lock(&bcm_device_lock); 890 list_del(&dev->list); 891 mutex_unlock(&bcm_device_lock); 892 893 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 894 895 return 0; 896 } 897 898 static const struct hci_uart_proto bcm_proto = { 899 .id = HCI_UART_BCM, 900 .name = "Broadcom", 901 .manufacturer = 15, 902 .init_speed = 115200, 903 .open = bcm_open, 904 .close = bcm_close, 905 .flush = bcm_flush, 906 .setup = bcm_setup, 907 .set_baudrate = bcm_set_baudrate, 908 .recv = bcm_recv, 909 .enqueue = bcm_enqueue, 910 .dequeue = bcm_dequeue, 911 }; 912 913 #ifdef CONFIG_ACPI 914 static const struct acpi_device_id bcm_acpi_match[] = { 915 { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 916 { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 917 { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 918 { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 919 { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 920 { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 921 { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 922 { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 923 { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 924 { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 925 { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 926 { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 927 { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 928 { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 929 { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, 930 { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, 931 { }, 932 }; 933 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 934 #endif 935 936 /* Platform suspend and resume callbacks */ 937 static const struct dev_pm_ops bcm_pm_ops = { 938 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 939 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 940 }; 941 942 static struct platform_driver bcm_driver = { 943 .probe = bcm_probe, 944 .remove = bcm_remove, 945 .driver = { 946 .name = "hci_bcm", 947 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 948 .pm = &bcm_pm_ops, 949 }, 950 }; 951 952 static int bcm_serdev_probe(struct serdev_device *serdev) 953 { 954 struct bcm_serdev *bcmdev; 955 u32 speed; 956 int err; 957 958 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL); 959 if (!bcmdev) 960 return -ENOMEM; 961 962 bcmdev->hu.serdev = serdev; 963 serdev_device_set_drvdata(serdev, bcmdev); 964 965 err = device_property_read_u32(&serdev->dev, "max-speed", &speed); 966 if (!err) 967 bcmdev->hu.oper_speed = speed; 968 969 return hci_uart_register_device(&bcmdev->hu, &bcm_proto); 970 } 971 972 static void bcm_serdev_remove(struct serdev_device *serdev) 973 { 974 struct bcm_serdev *bcmdev = serdev_device_get_drvdata(serdev); 975 976 hci_uart_unregister_device(&bcmdev->hu); 977 } 978 979 #ifdef CONFIG_OF 980 static const struct of_device_id bcm_bluetooth_of_match[] = { 981 { .compatible = "brcm,bcm43438-bt" }, 982 { }, 983 }; 984 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match); 985 #endif 986 987 static struct serdev_device_driver bcm_serdev_driver = { 988 .probe = bcm_serdev_probe, 989 .remove = bcm_serdev_remove, 990 .driver = { 991 .name = "hci_uart_bcm", 992 .of_match_table = of_match_ptr(bcm_bluetooth_of_match), 993 }, 994 }; 995 996 int __init bcm_init(void) 997 { 998 /* For now, we need to keep both platform device 999 * driver (ACPI generated) and serdev driver (DT). 1000 */ 1001 platform_driver_register(&bcm_driver); 1002 serdev_device_driver_register(&bcm_serdev_driver); 1003 1004 return hci_uart_register_proto(&bcm_proto); 1005 } 1006 1007 int __exit bcm_deinit(void) 1008 { 1009 platform_driver_unregister(&bcm_driver); 1010 serdev_device_driver_unregister(&bcm_serdev_driver); 1011 1012 return hci_uart_unregister_proto(&bcm_proto); 1013 } 1014