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/platform_device.h> 31 #include <linux/clk.h> 32 #include <linux/gpio/consumer.h> 33 #include <linux/tty.h> 34 #include <linux/interrupt.h> 35 #include <linux/dmi.h> 36 #include <linux/pm_runtime.h> 37 38 #include <net/bluetooth/bluetooth.h> 39 #include <net/bluetooth/hci_core.h> 40 41 #include "btbcm.h" 42 #include "hci_uart.h" 43 44 #define BCM_LM_DIAG_PKT 0x07 45 #define BCM_LM_DIAG_SIZE 63 46 47 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ 48 49 struct bcm_device { 50 struct list_head list; 51 52 struct platform_device *pdev; 53 54 const char *name; 55 struct gpio_desc *device_wakeup; 56 struct gpio_desc *shutdown; 57 58 struct clk *clk; 59 bool clk_enabled; 60 61 u32 init_speed; 62 int irq; 63 u8 irq_polarity; 64 65 #ifdef CONFIG_PM 66 struct hci_uart *hu; 67 bool is_suspended; /* suspend/resume flag */ 68 #endif 69 }; 70 71 struct bcm_data { 72 struct sk_buff *rx_skb; 73 struct sk_buff_head txq; 74 75 struct bcm_device *dev; 76 }; 77 78 /* List of BCM BT UART devices */ 79 static DEFINE_MUTEX(bcm_device_lock); 80 static LIST_HEAD(bcm_device_list); 81 82 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) 83 { 84 struct hci_dev *hdev = hu->hdev; 85 struct sk_buff *skb; 86 struct bcm_update_uart_baud_rate param; 87 88 if (speed > 3000000) { 89 struct bcm_write_uart_clock_setting clock; 90 91 clock.type = BCM_UART_CLOCK_48MHZ; 92 93 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type); 94 95 /* This Broadcom specific command changes the UART's controller 96 * clock for baud rate > 3000000. 97 */ 98 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); 99 if (IS_ERR(skb)) { 100 int err = PTR_ERR(skb); 101 bt_dev_err(hdev, "BCM: failed to write clock (%d)", 102 err); 103 return err; 104 } 105 106 kfree_skb(skb); 107 } 108 109 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed); 110 111 param.zero = cpu_to_le16(0); 112 param.baud_rate = cpu_to_le32(speed); 113 114 /* This Broadcom specific command changes the UART's controller baud 115 * rate. 116 */ 117 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, 118 HCI_INIT_TIMEOUT); 119 if (IS_ERR(skb)) { 120 int err = PTR_ERR(skb); 121 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)", 122 err); 123 return err; 124 } 125 126 kfree_skb(skb); 127 128 return 0; 129 } 130 131 /* bcm_device_exists should be protected by bcm_device_lock */ 132 static bool bcm_device_exists(struct bcm_device *device) 133 { 134 struct list_head *p; 135 136 list_for_each(p, &bcm_device_list) { 137 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 138 139 if (device == dev) 140 return true; 141 } 142 143 return false; 144 } 145 146 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) 147 { 148 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) 149 clk_enable(dev->clk); 150 151 gpiod_set_value(dev->shutdown, powered); 152 gpiod_set_value(dev->device_wakeup, powered); 153 154 if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled) 155 clk_disable(dev->clk); 156 157 dev->clk_enabled = powered; 158 159 return 0; 160 } 161 162 #ifdef CONFIG_PM 163 static irqreturn_t bcm_host_wake(int irq, void *data) 164 { 165 struct bcm_device *bdev = data; 166 167 bt_dev_dbg(bdev, "Host wake IRQ"); 168 169 pm_runtime_get(&bdev->pdev->dev); 170 pm_runtime_mark_last_busy(&bdev->pdev->dev); 171 pm_runtime_put_autosuspend(&bdev->pdev->dev); 172 173 return IRQ_HANDLED; 174 } 175 176 static int bcm_request_irq(struct bcm_data *bcm) 177 { 178 struct bcm_device *bdev = bcm->dev; 179 int err = 0; 180 181 /* If this is not a platform device, do not enable PM functionalities */ 182 mutex_lock(&bcm_device_lock); 183 if (!bcm_device_exists(bdev)) { 184 err = -ENODEV; 185 goto unlock; 186 } 187 188 if (bdev->irq > 0) { 189 err = devm_request_irq(&bdev->pdev->dev, bdev->irq, 190 bcm_host_wake, IRQF_TRIGGER_RISING, 191 "host_wake", bdev); 192 if (err) 193 goto unlock; 194 195 device_init_wakeup(&bdev->pdev->dev, true); 196 197 pm_runtime_set_autosuspend_delay(&bdev->pdev->dev, 198 BCM_AUTOSUSPEND_DELAY); 199 pm_runtime_use_autosuspend(&bdev->pdev->dev); 200 pm_runtime_set_active(&bdev->pdev->dev); 201 pm_runtime_enable(&bdev->pdev->dev); 202 } 203 204 unlock: 205 mutex_unlock(&bcm_device_lock); 206 207 return err; 208 } 209 210 static const struct bcm_set_sleep_mode default_sleep_params = { 211 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */ 212 .idle_host = 2, /* idle threshold HOST, in 300ms */ 213 .idle_dev = 2, /* idle threshold device, in 300ms */ 214 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */ 215 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */ 216 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */ 217 .combine_modes = 1, /* Combine sleep and LPM flag */ 218 .tristate_control = 0, /* Allow tri-state control of UART tx flag */ 219 /* Irrelevant USB flags */ 220 .usb_auto_sleep = 0, 221 .usb_resume_timeout = 0, 222 .pulsed_host_wake = 0, 223 .break_to_host = 0 224 }; 225 226 static int bcm_setup_sleep(struct hci_uart *hu) 227 { 228 struct bcm_data *bcm = hu->priv; 229 struct sk_buff *skb; 230 struct bcm_set_sleep_mode sleep_params = default_sleep_params; 231 232 sleep_params.host_wake_active = !bcm->dev->irq_polarity; 233 234 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params), 235 &sleep_params, HCI_INIT_TIMEOUT); 236 if (IS_ERR(skb)) { 237 int err = PTR_ERR(skb); 238 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err); 239 return err; 240 } 241 kfree_skb(skb); 242 243 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded"); 244 245 return 0; 246 } 247 #else 248 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; } 249 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; } 250 #endif 251 252 static int bcm_set_diag(struct hci_dev *hdev, bool enable) 253 { 254 struct hci_uart *hu = hci_get_drvdata(hdev); 255 struct bcm_data *bcm = hu->priv; 256 struct sk_buff *skb; 257 258 if (!test_bit(HCI_RUNNING, &hdev->flags)) 259 return -ENETDOWN; 260 261 skb = bt_skb_alloc(3, GFP_KERNEL); 262 if (!skb) 263 return -ENOMEM; 264 265 *skb_put(skb, 1) = BCM_LM_DIAG_PKT; 266 *skb_put(skb, 1) = 0xf0; 267 *skb_put(skb, 1) = enable; 268 269 skb_queue_tail(&bcm->txq, skb); 270 hci_uart_tx_wakeup(hu); 271 272 return 0; 273 } 274 275 static int bcm_open(struct hci_uart *hu) 276 { 277 struct bcm_data *bcm; 278 struct list_head *p; 279 280 bt_dev_dbg(hu->hdev, "hu %p", hu); 281 282 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); 283 if (!bcm) 284 return -ENOMEM; 285 286 skb_queue_head_init(&bcm->txq); 287 288 hu->priv = bcm; 289 290 mutex_lock(&bcm_device_lock); 291 list_for_each(p, &bcm_device_list) { 292 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 293 294 /* Retrieve saved bcm_device based on parent of the 295 * platform device (saved during device probe) and 296 * parent of tty device used by hci_uart 297 */ 298 if (hu->tty->dev->parent == dev->pdev->dev.parent) { 299 bcm->dev = dev; 300 hu->init_speed = dev->init_speed; 301 #ifdef CONFIG_PM 302 dev->hu = hu; 303 #endif 304 bcm_gpio_set_power(bcm->dev, true); 305 break; 306 } 307 } 308 309 mutex_unlock(&bcm_device_lock); 310 311 return 0; 312 } 313 314 static int bcm_close(struct hci_uart *hu) 315 { 316 struct bcm_data *bcm = hu->priv; 317 struct bcm_device *bdev = bcm->dev; 318 319 bt_dev_dbg(hu->hdev, "hu %p", hu); 320 321 /* Protect bcm->dev against removal of the device or driver */ 322 mutex_lock(&bcm_device_lock); 323 if (bcm_device_exists(bdev)) { 324 bcm_gpio_set_power(bdev, false); 325 #ifdef CONFIG_PM 326 pm_runtime_disable(&bdev->pdev->dev); 327 pm_runtime_set_suspended(&bdev->pdev->dev); 328 329 if (device_can_wakeup(&bdev->pdev->dev)) { 330 devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev); 331 device_init_wakeup(&bdev->pdev->dev, false); 332 } 333 334 bdev->hu = NULL; 335 #endif 336 } 337 mutex_unlock(&bcm_device_lock); 338 339 skb_queue_purge(&bcm->txq); 340 kfree_skb(bcm->rx_skb); 341 kfree(bcm); 342 343 hu->priv = NULL; 344 return 0; 345 } 346 347 static int bcm_flush(struct hci_uart *hu) 348 { 349 struct bcm_data *bcm = hu->priv; 350 351 bt_dev_dbg(hu->hdev, "hu %p", hu); 352 353 skb_queue_purge(&bcm->txq); 354 355 return 0; 356 } 357 358 static int bcm_setup(struct hci_uart *hu) 359 { 360 struct bcm_data *bcm = hu->priv; 361 char fw_name[64]; 362 const struct firmware *fw; 363 unsigned int speed; 364 int err; 365 366 bt_dev_dbg(hu->hdev, "hu %p", hu); 367 368 hu->hdev->set_diag = bcm_set_diag; 369 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 370 371 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name)); 372 if (err) 373 return err; 374 375 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 376 if (err < 0) { 377 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 378 return 0; 379 } 380 381 err = btbcm_patchram(hu->hdev, fw); 382 if (err) { 383 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 384 goto finalize; 385 } 386 387 /* Init speed if any */ 388 if (hu->init_speed) 389 speed = hu->init_speed; 390 else if (hu->proto->init_speed) 391 speed = hu->proto->init_speed; 392 else 393 speed = 0; 394 395 if (speed) 396 hci_uart_set_baudrate(hu, speed); 397 398 /* Operational speed if any */ 399 if (hu->oper_speed) 400 speed = hu->oper_speed; 401 else if (hu->proto->oper_speed) 402 speed = hu->proto->oper_speed; 403 else 404 speed = 0; 405 406 if (speed) { 407 err = bcm_set_baudrate(hu, speed); 408 if (!err) 409 hci_uart_set_baudrate(hu, speed); 410 } 411 412 finalize: 413 release_firmware(fw); 414 415 err = btbcm_finalize(hu->hdev); 416 if (err) 417 return err; 418 419 err = bcm_request_irq(bcm); 420 if (!err) 421 err = bcm_setup_sleep(hu); 422 423 return err; 424 } 425 426 #define BCM_RECV_LM_DIAG \ 427 .type = BCM_LM_DIAG_PKT, \ 428 .hlen = BCM_LM_DIAG_SIZE, \ 429 .loff = 0, \ 430 .lsize = 0, \ 431 .maxlen = BCM_LM_DIAG_SIZE 432 433 static const struct h4_recv_pkt bcm_recv_pkts[] = { 434 { H4_RECV_ACL, .recv = hci_recv_frame }, 435 { H4_RECV_SCO, .recv = hci_recv_frame }, 436 { H4_RECV_EVENT, .recv = hci_recv_frame }, 437 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 438 }; 439 440 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 441 { 442 struct bcm_data *bcm = hu->priv; 443 444 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 445 return -EUNATCH; 446 447 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 448 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 449 if (IS_ERR(bcm->rx_skb)) { 450 int err = PTR_ERR(bcm->rx_skb); 451 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 452 bcm->rx_skb = NULL; 453 return err; 454 } else if (!bcm->rx_skb) { 455 /* Delay auto-suspend when receiving completed packet */ 456 mutex_lock(&bcm_device_lock); 457 if (bcm->dev && bcm_device_exists(bcm->dev)) { 458 pm_runtime_get(&bcm->dev->pdev->dev); 459 pm_runtime_mark_last_busy(&bcm->dev->pdev->dev); 460 pm_runtime_put_autosuspend(&bcm->dev->pdev->dev); 461 } 462 mutex_unlock(&bcm_device_lock); 463 } 464 465 return count; 466 } 467 468 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 469 { 470 struct bcm_data *bcm = hu->priv; 471 472 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 473 474 /* Prepend skb with frame type */ 475 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 476 skb_queue_tail(&bcm->txq, skb); 477 478 return 0; 479 } 480 481 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 482 { 483 struct bcm_data *bcm = hu->priv; 484 struct sk_buff *skb = NULL; 485 struct bcm_device *bdev = NULL; 486 487 mutex_lock(&bcm_device_lock); 488 489 if (bcm_device_exists(bcm->dev)) { 490 bdev = bcm->dev; 491 pm_runtime_get_sync(&bdev->pdev->dev); 492 /* Shall be resumed here */ 493 } 494 495 skb = skb_dequeue(&bcm->txq); 496 497 if (bdev) { 498 pm_runtime_mark_last_busy(&bdev->pdev->dev); 499 pm_runtime_put_autosuspend(&bdev->pdev->dev); 500 } 501 502 mutex_unlock(&bcm_device_lock); 503 504 return skb; 505 } 506 507 #ifdef CONFIG_PM 508 static int bcm_suspend_device(struct device *dev) 509 { 510 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 511 512 bt_dev_dbg(bdev, ""); 513 514 if (!bdev->is_suspended && bdev->hu) { 515 hci_uart_set_flow_control(bdev->hu, true); 516 517 /* Once this returns, driver suspends BT via GPIO */ 518 bdev->is_suspended = true; 519 } 520 521 /* Suspend the device */ 522 if (bdev->device_wakeup) { 523 gpiod_set_value(bdev->device_wakeup, false); 524 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 525 mdelay(15); 526 } 527 528 return 0; 529 } 530 531 static int bcm_resume_device(struct device *dev) 532 { 533 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 534 535 bt_dev_dbg(bdev, ""); 536 537 if (bdev->device_wakeup) { 538 gpiod_set_value(bdev->device_wakeup, true); 539 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 540 mdelay(15); 541 } 542 543 /* When this executes, the device has woken up already */ 544 if (bdev->is_suspended && bdev->hu) { 545 bdev->is_suspended = false; 546 547 hci_uart_set_flow_control(bdev->hu, false); 548 } 549 550 return 0; 551 } 552 #endif 553 554 #ifdef CONFIG_PM_SLEEP 555 /* Platform suspend callback */ 556 static int bcm_suspend(struct device *dev) 557 { 558 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 559 int error; 560 561 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 562 563 /* bcm_suspend can be called at any time as long as platform device is 564 * bound, so it should use bcm_device_lock to protect access to hci_uart 565 * and device_wake-up GPIO. 566 */ 567 mutex_lock(&bcm_device_lock); 568 569 if (!bdev->hu) 570 goto unlock; 571 572 if (pm_runtime_active(dev)) 573 bcm_suspend_device(dev); 574 575 if (device_may_wakeup(&bdev->pdev->dev)) { 576 error = enable_irq_wake(bdev->irq); 577 if (!error) 578 bt_dev_dbg(bdev, "BCM irq: enabled"); 579 } 580 581 unlock: 582 mutex_unlock(&bcm_device_lock); 583 584 return 0; 585 } 586 587 /* Platform resume callback */ 588 static int bcm_resume(struct device *dev) 589 { 590 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 591 592 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 593 594 /* bcm_resume can be called at any time as long as platform device is 595 * bound, so it should use bcm_device_lock to protect access to hci_uart 596 * and device_wake-up GPIO. 597 */ 598 mutex_lock(&bcm_device_lock); 599 600 if (!bdev->hu) 601 goto unlock; 602 603 if (device_may_wakeup(&bdev->pdev->dev)) { 604 disable_irq_wake(bdev->irq); 605 bt_dev_dbg(bdev, "BCM irq: disabled"); 606 } 607 608 bcm_resume_device(dev); 609 610 unlock: 611 mutex_unlock(&bcm_device_lock); 612 613 pm_runtime_disable(dev); 614 pm_runtime_set_active(dev); 615 pm_runtime_enable(dev); 616 617 return 0; 618 } 619 #endif 620 621 static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false }; 622 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false }; 623 static const struct acpi_gpio_params host_wakeup_gpios = { 2, 0, false }; 624 625 static const struct acpi_gpio_mapping acpi_bcm_default_gpios[] = { 626 { "device-wakeup-gpios", &device_wakeup_gpios, 1 }, 627 { "shutdown-gpios", &shutdown_gpios, 1 }, 628 { "host-wakeup-gpios", &host_wakeup_gpios, 1 }, 629 { }, 630 }; 631 632 #ifdef CONFIG_ACPI 633 static u8 acpi_active_low = ACPI_ACTIVE_LOW; 634 635 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */ 636 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = { 637 { 638 .ident = "Asus T100TA", 639 .matches = { 640 DMI_EXACT_MATCH(DMI_SYS_VENDOR, 641 "ASUSTeK COMPUTER INC."), 642 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"), 643 }, 644 .driver_data = &acpi_active_low, 645 }, 646 { } 647 }; 648 649 static int bcm_resource(struct acpi_resource *ares, void *data) 650 { 651 struct bcm_device *dev = data; 652 struct acpi_resource_extended_irq *irq; 653 struct acpi_resource_gpio *gpio; 654 struct acpi_resource_uart_serialbus *sb; 655 656 switch (ares->type) { 657 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 658 irq = &ares->data.extended_irq; 659 dev->irq_polarity = irq->polarity; 660 break; 661 662 case ACPI_RESOURCE_TYPE_GPIO: 663 gpio = &ares->data.gpio; 664 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) 665 dev->irq_polarity = gpio->polarity; 666 break; 667 668 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 669 sb = &ares->data.uart_serial_bus; 670 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) 671 dev->init_speed = sb->default_baud_rate; 672 break; 673 674 default: 675 break; 676 } 677 678 /* Always tell the ACPI core to skip this resource */ 679 return 1; 680 } 681 682 static int bcm_acpi_probe(struct bcm_device *dev) 683 { 684 struct platform_device *pdev = dev->pdev; 685 LIST_HEAD(resources); 686 const struct dmi_system_id *dmi_id; 687 int ret; 688 689 /* Retrieve GPIO data */ 690 dev->name = dev_name(&pdev->dev); 691 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev), 692 acpi_bcm_default_gpios); 693 if (ret) 694 return ret; 695 696 dev->clk = devm_clk_get(&pdev->dev, NULL); 697 698 dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev, 699 "device-wakeup", 700 GPIOD_OUT_LOW); 701 if (IS_ERR(dev->device_wakeup)) 702 return PTR_ERR(dev->device_wakeup); 703 704 dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown", 705 GPIOD_OUT_LOW); 706 if (IS_ERR(dev->shutdown)) 707 return PTR_ERR(dev->shutdown); 708 709 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 710 dev->irq = platform_get_irq(pdev, 0); 711 if (dev->irq <= 0) { 712 struct gpio_desc *gpio; 713 714 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup", 715 GPIOD_IN); 716 if (IS_ERR(gpio)) 717 return PTR_ERR(gpio); 718 719 dev->irq = gpiod_to_irq(gpio); 720 } 721 722 dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq); 723 724 /* Make sure at-least one of the GPIO is defined and that 725 * a name is specified for this instance 726 */ 727 if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) { 728 dev_err(&pdev->dev, "invalid platform data\n"); 729 return -EINVAL; 730 } 731 732 /* Retrieve UART ACPI info */ 733 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev), 734 &resources, bcm_resource, dev); 735 if (ret < 0) 736 return ret; 737 acpi_dev_free_resource_list(&resources); 738 739 dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table); 740 if (dmi_id) { 741 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low", 742 dmi_id->ident); 743 dev->irq_polarity = *(u8 *)dmi_id->driver_data; 744 } 745 746 return 0; 747 } 748 #else 749 static int bcm_acpi_probe(struct bcm_device *dev) 750 { 751 return -EINVAL; 752 } 753 #endif /* CONFIG_ACPI */ 754 755 static int bcm_probe(struct platform_device *pdev) 756 { 757 struct bcm_device *dev; 758 int ret; 759 760 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 761 if (!dev) 762 return -ENOMEM; 763 764 dev->pdev = pdev; 765 766 ret = bcm_acpi_probe(dev); 767 if (ret) 768 return ret; 769 770 platform_set_drvdata(pdev, dev); 771 772 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 773 774 /* Place this instance on the device list */ 775 mutex_lock(&bcm_device_lock); 776 list_add_tail(&dev->list, &bcm_device_list); 777 mutex_unlock(&bcm_device_lock); 778 779 bcm_gpio_set_power(dev, false); 780 781 return 0; 782 } 783 784 static int bcm_remove(struct platform_device *pdev) 785 { 786 struct bcm_device *dev = platform_get_drvdata(pdev); 787 788 mutex_lock(&bcm_device_lock); 789 list_del(&dev->list); 790 mutex_unlock(&bcm_device_lock); 791 792 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev)); 793 794 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 795 796 return 0; 797 } 798 799 static const struct hci_uart_proto bcm_proto = { 800 .id = HCI_UART_BCM, 801 .name = "BCM", 802 .manufacturer = 15, 803 .init_speed = 115200, 804 .oper_speed = 4000000, 805 .open = bcm_open, 806 .close = bcm_close, 807 .flush = bcm_flush, 808 .setup = bcm_setup, 809 .set_baudrate = bcm_set_baudrate, 810 .recv = bcm_recv, 811 .enqueue = bcm_enqueue, 812 .dequeue = bcm_dequeue, 813 }; 814 815 #ifdef CONFIG_ACPI 816 static const struct acpi_device_id bcm_acpi_match[] = { 817 { "BCM2E1A", 0 }, 818 { "BCM2E39", 0 }, 819 { "BCM2E3A", 0 }, 820 { "BCM2E3D", 0 }, 821 { "BCM2E3F", 0 }, 822 { "BCM2E40", 0 }, 823 { "BCM2E54", 0 }, 824 { "BCM2E55", 0 }, 825 { "BCM2E64", 0 }, 826 { "BCM2E65", 0 }, 827 { "BCM2E67", 0 }, 828 { "BCM2E71", 0 }, 829 { "BCM2E7B", 0 }, 830 { "BCM2E7C", 0 }, 831 { }, 832 }; 833 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 834 #endif 835 836 /* Platform suspend and resume callbacks */ 837 static const struct dev_pm_ops bcm_pm_ops = { 838 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 839 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 840 }; 841 842 static struct platform_driver bcm_driver = { 843 .probe = bcm_probe, 844 .remove = bcm_remove, 845 .driver = { 846 .name = "hci_bcm", 847 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 848 .pm = &bcm_pm_ops, 849 }, 850 }; 851 852 int __init bcm_init(void) 853 { 854 platform_driver_register(&bcm_driver); 855 856 return hci_uart_register_proto(&bcm_proto); 857 } 858 859 int __exit bcm_deinit(void) 860 { 861 platform_driver_unregister(&bcm_driver); 862 863 return hci_uart_unregister_proto(&bcm_proto); 864 } 865