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_prepare_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_unprepare(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_u8(skb, BCM_LM_DIAG_PKT); 266 skb_put_u8(skb, 0xf0); 267 skb_put_u8(skb, 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 if (!hu->tty->dev) 291 goto out; 292 293 mutex_lock(&bcm_device_lock); 294 list_for_each(p, &bcm_device_list) { 295 struct bcm_device *dev = list_entry(p, struct bcm_device, list); 296 297 /* Retrieve saved bcm_device based on parent of the 298 * platform device (saved during device probe) and 299 * parent of tty device used by hci_uart 300 */ 301 if (hu->tty->dev->parent == dev->pdev->dev.parent) { 302 bcm->dev = dev; 303 hu->init_speed = dev->init_speed; 304 #ifdef CONFIG_PM 305 dev->hu = hu; 306 #endif 307 bcm_gpio_set_power(bcm->dev, true); 308 break; 309 } 310 } 311 312 mutex_unlock(&bcm_device_lock); 313 out: 314 return 0; 315 } 316 317 static int bcm_close(struct hci_uart *hu) 318 { 319 struct bcm_data *bcm = hu->priv; 320 struct bcm_device *bdev = bcm->dev; 321 322 bt_dev_dbg(hu->hdev, "hu %p", hu); 323 324 /* Protect bcm->dev against removal of the device or driver */ 325 mutex_lock(&bcm_device_lock); 326 if (bcm_device_exists(bdev)) { 327 bcm_gpio_set_power(bdev, false); 328 #ifdef CONFIG_PM 329 pm_runtime_disable(&bdev->pdev->dev); 330 pm_runtime_set_suspended(&bdev->pdev->dev); 331 332 if (device_can_wakeup(&bdev->pdev->dev)) { 333 devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev); 334 device_init_wakeup(&bdev->pdev->dev, false); 335 } 336 337 bdev->hu = NULL; 338 #endif 339 } 340 mutex_unlock(&bcm_device_lock); 341 342 skb_queue_purge(&bcm->txq); 343 kfree_skb(bcm->rx_skb); 344 kfree(bcm); 345 346 hu->priv = NULL; 347 return 0; 348 } 349 350 static int bcm_flush(struct hci_uart *hu) 351 { 352 struct bcm_data *bcm = hu->priv; 353 354 bt_dev_dbg(hu->hdev, "hu %p", hu); 355 356 skb_queue_purge(&bcm->txq); 357 358 return 0; 359 } 360 361 static int bcm_setup(struct hci_uart *hu) 362 { 363 struct bcm_data *bcm = hu->priv; 364 char fw_name[64]; 365 const struct firmware *fw; 366 unsigned int speed; 367 int err; 368 369 bt_dev_dbg(hu->hdev, "hu %p", hu); 370 371 hu->hdev->set_diag = bcm_set_diag; 372 hu->hdev->set_bdaddr = btbcm_set_bdaddr; 373 374 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name)); 375 if (err) 376 return err; 377 378 err = request_firmware(&fw, fw_name, &hu->hdev->dev); 379 if (err < 0) { 380 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); 381 return 0; 382 } 383 384 err = btbcm_patchram(hu->hdev, fw); 385 if (err) { 386 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); 387 goto finalize; 388 } 389 390 /* Init speed if any */ 391 if (hu->init_speed) 392 speed = hu->init_speed; 393 else if (hu->proto->init_speed) 394 speed = hu->proto->init_speed; 395 else 396 speed = 0; 397 398 if (speed) 399 hci_uart_set_baudrate(hu, speed); 400 401 /* Operational speed if any */ 402 if (hu->oper_speed) 403 speed = hu->oper_speed; 404 else if (hu->proto->oper_speed) 405 speed = hu->proto->oper_speed; 406 else 407 speed = 0; 408 409 if (speed) { 410 err = bcm_set_baudrate(hu, speed); 411 if (!err) 412 hci_uart_set_baudrate(hu, speed); 413 } 414 415 finalize: 416 release_firmware(fw); 417 418 err = btbcm_finalize(hu->hdev); 419 if (err) 420 return err; 421 422 if (!bcm_request_irq(bcm)) 423 err = bcm_setup_sleep(hu); 424 425 return err; 426 } 427 428 #define BCM_RECV_LM_DIAG \ 429 .type = BCM_LM_DIAG_PKT, \ 430 .hlen = BCM_LM_DIAG_SIZE, \ 431 .loff = 0, \ 432 .lsize = 0, \ 433 .maxlen = BCM_LM_DIAG_SIZE 434 435 static const struct h4_recv_pkt bcm_recv_pkts[] = { 436 { H4_RECV_ACL, .recv = hci_recv_frame }, 437 { H4_RECV_SCO, .recv = hci_recv_frame }, 438 { H4_RECV_EVENT, .recv = hci_recv_frame }, 439 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, 440 }; 441 442 static int bcm_recv(struct hci_uart *hu, const void *data, int count) 443 { 444 struct bcm_data *bcm = hu->priv; 445 446 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 447 return -EUNATCH; 448 449 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, 450 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); 451 if (IS_ERR(bcm->rx_skb)) { 452 int err = PTR_ERR(bcm->rx_skb); 453 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); 454 bcm->rx_skb = NULL; 455 return err; 456 } else if (!bcm->rx_skb) { 457 /* Delay auto-suspend when receiving completed packet */ 458 mutex_lock(&bcm_device_lock); 459 if (bcm->dev && bcm_device_exists(bcm->dev)) { 460 pm_runtime_get(&bcm->dev->pdev->dev); 461 pm_runtime_mark_last_busy(&bcm->dev->pdev->dev); 462 pm_runtime_put_autosuspend(&bcm->dev->pdev->dev); 463 } 464 mutex_unlock(&bcm_device_lock); 465 } 466 467 return count; 468 } 469 470 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) 471 { 472 struct bcm_data *bcm = hu->priv; 473 474 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); 475 476 /* Prepend skb with frame type */ 477 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); 478 skb_queue_tail(&bcm->txq, skb); 479 480 return 0; 481 } 482 483 static struct sk_buff *bcm_dequeue(struct hci_uart *hu) 484 { 485 struct bcm_data *bcm = hu->priv; 486 struct sk_buff *skb = NULL; 487 struct bcm_device *bdev = NULL; 488 489 mutex_lock(&bcm_device_lock); 490 491 if (bcm_device_exists(bcm->dev)) { 492 bdev = bcm->dev; 493 pm_runtime_get_sync(&bdev->pdev->dev); 494 /* Shall be resumed here */ 495 } 496 497 skb = skb_dequeue(&bcm->txq); 498 499 if (bdev) { 500 pm_runtime_mark_last_busy(&bdev->pdev->dev); 501 pm_runtime_put_autosuspend(&bdev->pdev->dev); 502 } 503 504 mutex_unlock(&bcm_device_lock); 505 506 return skb; 507 } 508 509 #ifdef CONFIG_PM 510 static int bcm_suspend_device(struct device *dev) 511 { 512 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 513 514 bt_dev_dbg(bdev, ""); 515 516 if (!bdev->is_suspended && bdev->hu) { 517 hci_uart_set_flow_control(bdev->hu, true); 518 519 /* Once this returns, driver suspends BT via GPIO */ 520 bdev->is_suspended = true; 521 } 522 523 /* Suspend the device */ 524 if (bdev->device_wakeup) { 525 gpiod_set_value(bdev->device_wakeup, false); 526 bt_dev_dbg(bdev, "suspend, delaying 15 ms"); 527 mdelay(15); 528 } 529 530 return 0; 531 } 532 533 static int bcm_resume_device(struct device *dev) 534 { 535 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 536 537 bt_dev_dbg(bdev, ""); 538 539 if (bdev->device_wakeup) { 540 gpiod_set_value(bdev->device_wakeup, true); 541 bt_dev_dbg(bdev, "resume, delaying 15 ms"); 542 mdelay(15); 543 } 544 545 /* When this executes, the device has woken up already */ 546 if (bdev->is_suspended && bdev->hu) { 547 bdev->is_suspended = false; 548 549 hci_uart_set_flow_control(bdev->hu, false); 550 } 551 552 return 0; 553 } 554 #endif 555 556 #ifdef CONFIG_PM_SLEEP 557 /* Platform suspend callback */ 558 static int bcm_suspend(struct device *dev) 559 { 560 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 561 int error; 562 563 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); 564 565 /* bcm_suspend can be called at any time as long as platform device is 566 * bound, so it should use bcm_device_lock to protect access to hci_uart 567 * and device_wake-up GPIO. 568 */ 569 mutex_lock(&bcm_device_lock); 570 571 if (!bdev->hu) 572 goto unlock; 573 574 if (pm_runtime_active(dev)) 575 bcm_suspend_device(dev); 576 577 if (device_may_wakeup(&bdev->pdev->dev)) { 578 error = enable_irq_wake(bdev->irq); 579 if (!error) 580 bt_dev_dbg(bdev, "BCM irq: enabled"); 581 } 582 583 unlock: 584 mutex_unlock(&bcm_device_lock); 585 586 return 0; 587 } 588 589 /* Platform resume callback */ 590 static int bcm_resume(struct device *dev) 591 { 592 struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); 593 594 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); 595 596 /* bcm_resume can be called at any time as long as platform device is 597 * bound, so it should use bcm_device_lock to protect access to hci_uart 598 * and device_wake-up GPIO. 599 */ 600 mutex_lock(&bcm_device_lock); 601 602 if (!bdev->hu) 603 goto unlock; 604 605 if (device_may_wakeup(&bdev->pdev->dev)) { 606 disable_irq_wake(bdev->irq); 607 bt_dev_dbg(bdev, "BCM irq: disabled"); 608 } 609 610 bcm_resume_device(dev); 611 612 unlock: 613 mutex_unlock(&bcm_device_lock); 614 615 pm_runtime_disable(dev); 616 pm_runtime_set_active(dev); 617 pm_runtime_enable(dev); 618 619 return 0; 620 } 621 #endif 622 623 static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false }; 624 static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false }; 625 static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false }; 626 627 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 628 { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 }, 629 { "shutdown-gpios", &int_last_shutdown_gpios, 1 }, 630 { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 }, 631 { }, 632 }; 633 634 static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false }; 635 static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false }; 636 static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false }; 637 638 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 639 { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 }, 640 { "shutdown-gpios", &int_first_shutdown_gpios, 1 }, 641 { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 }, 642 { }, 643 }; 644 645 #ifdef CONFIG_ACPI 646 static u8 acpi_active_low = ACPI_ACTIVE_LOW; 647 648 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */ 649 static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = { 650 { 651 .ident = "Asus T100TA", 652 .matches = { 653 DMI_EXACT_MATCH(DMI_SYS_VENDOR, 654 "ASUSTeK COMPUTER INC."), 655 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"), 656 }, 657 .driver_data = &acpi_active_low, 658 }, 659 { 660 .ident = "Asus T100CHI", 661 .matches = { 662 DMI_EXACT_MATCH(DMI_SYS_VENDOR, 663 "ASUSTeK COMPUTER INC."), 664 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"), 665 }, 666 .driver_data = &acpi_active_low, 667 }, 668 { /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */ 669 .ident = "Lenovo ThinkPad 8", 670 .matches = { 671 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"), 672 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"), 673 }, 674 .driver_data = &acpi_active_low, 675 }, 676 { } 677 }; 678 679 static int bcm_resource(struct acpi_resource *ares, void *data) 680 { 681 struct bcm_device *dev = data; 682 struct acpi_resource_extended_irq *irq; 683 struct acpi_resource_gpio *gpio; 684 struct acpi_resource_uart_serialbus *sb; 685 686 switch (ares->type) { 687 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 688 irq = &ares->data.extended_irq; 689 dev->irq_polarity = irq->polarity; 690 break; 691 692 case ACPI_RESOURCE_TYPE_GPIO: 693 gpio = &ares->data.gpio; 694 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) 695 dev->irq_polarity = gpio->polarity; 696 break; 697 698 case ACPI_RESOURCE_TYPE_SERIAL_BUS: 699 sb = &ares->data.uart_serial_bus; 700 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) 701 dev->init_speed = sb->default_baud_rate; 702 break; 703 704 default: 705 break; 706 } 707 708 /* Always tell the ACPI core to skip this resource */ 709 return 1; 710 } 711 #endif /* CONFIG_ACPI */ 712 713 static int bcm_platform_probe(struct bcm_device *dev) 714 { 715 struct platform_device *pdev = dev->pdev; 716 717 dev->name = dev_name(&pdev->dev); 718 719 dev->clk = devm_clk_get(&pdev->dev, NULL); 720 721 dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev, 722 "device-wakeup", 723 GPIOD_OUT_LOW); 724 if (IS_ERR(dev->device_wakeup)) 725 return PTR_ERR(dev->device_wakeup); 726 727 dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown", 728 GPIOD_OUT_LOW); 729 if (IS_ERR(dev->shutdown)) 730 return PTR_ERR(dev->shutdown); 731 732 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ 733 dev->irq = platform_get_irq(pdev, 0); 734 if (dev->irq <= 0) { 735 struct gpio_desc *gpio; 736 737 gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup", 738 GPIOD_IN); 739 if (IS_ERR(gpio)) 740 return PTR_ERR(gpio); 741 742 dev->irq = gpiod_to_irq(gpio); 743 } 744 745 dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq); 746 747 /* Make sure at-least one of the GPIO is defined and that 748 * a name is specified for this instance 749 */ 750 if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) { 751 dev_err(&pdev->dev, "invalid platform data\n"); 752 return -EINVAL; 753 } 754 755 return 0; 756 } 757 758 #ifdef CONFIG_ACPI 759 static int bcm_acpi_probe(struct bcm_device *dev) 760 { 761 struct platform_device *pdev = dev->pdev; 762 LIST_HEAD(resources); 763 const struct dmi_system_id *dmi_id; 764 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; 765 const struct acpi_device_id *id; 766 int ret; 767 768 /* Retrieve GPIO data */ 769 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); 770 if (id) 771 gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data; 772 773 ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping); 774 if (ret) 775 return ret; 776 777 ret = bcm_platform_probe(dev); 778 if (ret) 779 return ret; 780 781 /* Retrieve UART ACPI info */ 782 ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev), 783 &resources, bcm_resource, dev); 784 if (ret < 0) 785 return ret; 786 acpi_dev_free_resource_list(&resources); 787 788 dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table); 789 if (dmi_id) { 790 bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low", 791 dmi_id->ident); 792 dev->irq_polarity = *(u8 *)dmi_id->driver_data; 793 } 794 795 return 0; 796 } 797 #else 798 static int bcm_acpi_probe(struct bcm_device *dev) 799 { 800 return -EINVAL; 801 } 802 #endif /* CONFIG_ACPI */ 803 804 static int bcm_probe(struct platform_device *pdev) 805 { 806 struct bcm_device *dev; 807 int ret; 808 809 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 810 if (!dev) 811 return -ENOMEM; 812 813 dev->pdev = pdev; 814 815 if (has_acpi_companion(&pdev->dev)) 816 ret = bcm_acpi_probe(dev); 817 else 818 ret = bcm_platform_probe(dev); 819 if (ret) 820 return ret; 821 822 platform_set_drvdata(pdev, dev); 823 824 dev_info(&pdev->dev, "%s device registered.\n", dev->name); 825 826 /* Place this instance on the device list */ 827 mutex_lock(&bcm_device_lock); 828 list_add_tail(&dev->list, &bcm_device_list); 829 mutex_unlock(&bcm_device_lock); 830 831 bcm_gpio_set_power(dev, false); 832 833 return 0; 834 } 835 836 static int bcm_remove(struct platform_device *pdev) 837 { 838 struct bcm_device *dev = platform_get_drvdata(pdev); 839 840 mutex_lock(&bcm_device_lock); 841 list_del(&dev->list); 842 mutex_unlock(&bcm_device_lock); 843 844 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); 845 846 return 0; 847 } 848 849 static const struct hci_uart_proto bcm_proto = { 850 .id = HCI_UART_BCM, 851 .name = "Broadcom", 852 .manufacturer = 15, 853 .init_speed = 115200, 854 .oper_speed = 4000000, 855 .open = bcm_open, 856 .close = bcm_close, 857 .flush = bcm_flush, 858 .setup = bcm_setup, 859 .set_baudrate = bcm_set_baudrate, 860 .recv = bcm_recv, 861 .enqueue = bcm_enqueue, 862 .dequeue = bcm_dequeue, 863 }; 864 865 #ifdef CONFIG_ACPI 866 static const struct acpi_device_id bcm_acpi_match[] = { 867 { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 868 { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 869 { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 870 { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 871 { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 872 { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 873 { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 874 { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 875 { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 876 { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 877 { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 878 { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 879 { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 880 { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, 881 { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, 882 { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, 883 { }, 884 }; 885 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); 886 #endif 887 888 /* Platform suspend and resume callbacks */ 889 static const struct dev_pm_ops bcm_pm_ops = { 890 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) 891 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) 892 }; 893 894 static struct platform_driver bcm_driver = { 895 .probe = bcm_probe, 896 .remove = bcm_remove, 897 .driver = { 898 .name = "hci_bcm", 899 .acpi_match_table = ACPI_PTR(bcm_acpi_match), 900 .pm = &bcm_pm_ops, 901 }, 902 }; 903 904 int __init bcm_init(void) 905 { 906 platform_driver_register(&bcm_driver); 907 908 return hci_uart_register_proto(&bcm_proto); 909 } 910 911 int __exit bcm_deinit(void) 912 { 913 platform_driver_unregister(&bcm_driver); 914 915 return hci_uart_unregister_proto(&bcm_proto); 916 } 917