1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ACPI helpers for GPIO API 4 * 5 * Copyright (C) 2012, Intel Corporation 6 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> 7 * Mika Westerberg <mika.westerberg@linux.intel.com> 8 */ 9 10 #include <linux/dmi.h> 11 #include <linux/errno.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/gpio/driver.h> 14 #include <linux/gpio/machine.h> 15 #include <linux/export.h> 16 #include <linux/acpi.h> 17 #include <linux/interrupt.h> 18 #include <linux/mutex.h> 19 #include <linux/pinctrl/pinctrl.h> 20 21 #include "gpiolib.h" 22 #include "gpiolib-acpi.h" 23 24 static int run_edge_events_on_boot = -1; 25 module_param(run_edge_events_on_boot, int, 0444); 26 MODULE_PARM_DESC(run_edge_events_on_boot, 27 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto"); 28 29 static char *ignore_wake; 30 module_param(ignore_wake, charp, 0444); 31 MODULE_PARM_DESC(ignore_wake, 32 "controller@pin combos on which to ignore the ACPI wake flag " 33 "ignore_wake=controller@pin[,controller@pin[,...]]"); 34 35 struct acpi_gpiolib_dmi_quirk { 36 bool no_edge_events_on_boot; 37 char *ignore_wake; 38 }; 39 40 /** 41 * struct acpi_gpio_event - ACPI GPIO event handler data 42 * 43 * @node: list-entry of the events list of the struct acpi_gpio_chip 44 * @handle: handle of ACPI method to execute when the IRQ triggers 45 * @handler: handler function to pass to request_irq() when requesting the IRQ 46 * @pin: GPIO pin number on the struct gpio_chip 47 * @irq: Linux IRQ number for the event, for request_irq() / free_irq() 48 * @irqflags: flags to pass to request_irq() when requesting the IRQ 49 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source 50 * @irq_requested:True if request_irq() has been done 51 * @desc: struct gpio_desc for the GPIO pin for this event 52 */ 53 struct acpi_gpio_event { 54 struct list_head node; 55 acpi_handle handle; 56 irq_handler_t handler; 57 unsigned int pin; 58 unsigned int irq; 59 unsigned long irqflags; 60 bool irq_is_wake; 61 bool irq_requested; 62 struct gpio_desc *desc; 63 }; 64 65 struct acpi_gpio_connection { 66 struct list_head node; 67 unsigned int pin; 68 struct gpio_desc *desc; 69 }; 70 71 struct acpi_gpio_chip { 72 /* 73 * ACPICA requires that the first field of the context parameter 74 * passed to acpi_install_address_space_handler() is large enough 75 * to hold struct acpi_connection_info. 76 */ 77 struct acpi_connection_info conn_info; 78 struct list_head conns; 79 struct mutex conn_lock; 80 struct gpio_chip *chip; 81 struct list_head events; 82 struct list_head deferred_req_irqs_list_entry; 83 }; 84 85 /* 86 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init 87 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a 88 * late_initcall_sync() handler, so that other builtin drivers can register their 89 * OpRegions before the event handlers can run. This list contains GPIO chips 90 * for which the acpi_gpiochip_request_irqs() call has been deferred. 91 */ 92 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock); 93 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list); 94 static bool acpi_gpio_deferred_req_irqs_done; 95 96 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) 97 { 98 if (!gc->parent) 99 return false; 100 101 return ACPI_HANDLE(gc->parent) == data; 102 } 103 104 /** 105 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API 106 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") 107 * @pin: ACPI GPIO pin number (0-based, controller-relative) 108 * 109 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR 110 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO 111 * controller does not have GPIO chip registered at the moment. This is to 112 * support probe deferral. 113 */ 114 static struct gpio_desc *acpi_get_gpiod(char *path, int pin) 115 { 116 struct gpio_chip *chip; 117 acpi_handle handle; 118 acpi_status status; 119 120 status = acpi_get_handle(NULL, path, &handle); 121 if (ACPI_FAILURE(status)) 122 return ERR_PTR(-ENODEV); 123 124 chip = gpiochip_find(handle, acpi_gpiochip_find); 125 if (!chip) 126 return ERR_PTR(-EPROBE_DEFER); 127 128 return gpiochip_get_desc(chip, pin); 129 } 130 131 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) 132 { 133 struct acpi_gpio_event *event = data; 134 135 acpi_evaluate_object(event->handle, NULL, NULL, NULL); 136 137 return IRQ_HANDLED; 138 } 139 140 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) 141 { 142 struct acpi_gpio_event *event = data; 143 144 acpi_execute_simple_method(event->handle, NULL, event->pin); 145 146 return IRQ_HANDLED; 147 } 148 149 static void acpi_gpio_chip_dh(acpi_handle handle, void *data) 150 { 151 /* The address of this function is used as a key. */ 152 } 153 154 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares, 155 struct acpi_resource_gpio **agpio) 156 { 157 struct acpi_resource_gpio *gpio; 158 159 if (ares->type != ACPI_RESOURCE_TYPE_GPIO) 160 return false; 161 162 gpio = &ares->data.gpio; 163 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) 164 return false; 165 166 *agpio = gpio; 167 return true; 168 } 169 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource); 170 171 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio, 172 struct acpi_gpio_event *event) 173 { 174 int ret, value; 175 176 ret = request_threaded_irq(event->irq, NULL, event->handler, 177 event->irqflags, "ACPI:Event", event); 178 if (ret) { 179 dev_err(acpi_gpio->chip->parent, 180 "Failed to setup interrupt handler for %d\n", 181 event->irq); 182 return; 183 } 184 185 if (event->irq_is_wake) 186 enable_irq_wake(event->irq); 187 188 event->irq_requested = true; 189 190 /* Make sure we trigger the initial state of edge-triggered IRQs */ 191 if (run_edge_events_on_boot && 192 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) { 193 value = gpiod_get_raw_value_cansleep(event->desc); 194 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) || 195 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0)) 196 event->handler(event->irq, event); 197 } 198 } 199 200 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio) 201 { 202 struct acpi_gpio_event *event; 203 204 list_for_each_entry(event, &acpi_gpio->events, node) 205 acpi_gpiochip_request_irq(acpi_gpio, event); 206 } 207 208 static enum gpiod_flags 209 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity) 210 { 211 /* GpioInt() implies input configuration */ 212 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) 213 return GPIOD_IN; 214 215 switch (agpio->io_restriction) { 216 case ACPI_IO_RESTRICT_INPUT: 217 return GPIOD_IN; 218 case ACPI_IO_RESTRICT_OUTPUT: 219 /* 220 * ACPI GPIO resources don't contain an initial value for the 221 * GPIO. Therefore we deduce that value from the pull field 222 * and the polarity instead. If the pin is pulled up we assume 223 * default to be high, if it is pulled down we assume default 224 * to be low, otherwise we leave pin untouched. For active low 225 * polarity values will be switched. See also 226 * Documentation/firmware-guide/acpi/gpio-properties.rst. 227 */ 228 switch (agpio->pin_config) { 229 case ACPI_PIN_CONFIG_PULLUP: 230 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH; 231 case ACPI_PIN_CONFIG_PULLDOWN: 232 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; 233 default: 234 break; 235 } 236 break; 237 default: 238 break; 239 } 240 241 /* 242 * Assume that the BIOS has configured the direction and pull 243 * accordingly. 244 */ 245 return GPIOD_ASIS; 246 } 247 248 static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip, 249 struct acpi_resource_gpio *agpio, 250 unsigned int index, 251 const char *label) 252 { 253 int polarity = GPIO_ACTIVE_HIGH; 254 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity); 255 unsigned int pin = agpio->pin_table[index]; 256 struct gpio_desc *desc; 257 int ret; 258 259 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags); 260 if (IS_ERR(desc)) 261 return desc; 262 263 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout); 264 if (ret) 265 gpiochip_free_own_desc(desc); 266 267 return ret ? ERR_PTR(ret) : desc; 268 } 269 270 static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in) 271 { 272 const char *controller, *pin_str; 273 int len, pin; 274 char *endp; 275 276 controller = ignore_wake; 277 while (controller) { 278 pin_str = strchr(controller, '@'); 279 if (!pin_str) 280 goto err; 281 282 len = pin_str - controller; 283 if (len == strlen(controller_in) && 284 strncmp(controller, controller_in, len) == 0) { 285 pin = simple_strtoul(pin_str + 1, &endp, 10); 286 if (*endp != 0 && *endp != ',') 287 goto err; 288 289 if (pin == pin_in) 290 return true; 291 } 292 293 controller = strchr(controller, ','); 294 if (controller) 295 controller++; 296 } 297 298 return false; 299 err: 300 pr_err_once("Error invalid value for gpiolib_acpi.ignore_wake: %s\n", 301 ignore_wake); 302 return false; 303 } 304 305 static bool acpi_gpio_irq_is_wake(struct device *parent, 306 struct acpi_resource_gpio *agpio) 307 { 308 int pin = agpio->pin_table[0]; 309 310 if (agpio->wake_capable != ACPI_WAKE_CAPABLE) 311 return false; 312 313 if (acpi_gpio_in_ignore_list(dev_name(parent), pin)) { 314 dev_info(parent, "Ignoring wakeup on pin %d\n", pin); 315 return false; 316 } 317 318 return true; 319 } 320 321 /* Always returns AE_OK so that we keep looping over the resources */ 322 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares, 323 void *context) 324 { 325 struct acpi_gpio_chip *acpi_gpio = context; 326 struct gpio_chip *chip = acpi_gpio->chip; 327 struct acpi_resource_gpio *agpio; 328 acpi_handle handle, evt_handle; 329 struct acpi_gpio_event *event; 330 irq_handler_t handler = NULL; 331 struct gpio_desc *desc; 332 int ret, pin, irq; 333 334 if (!acpi_gpio_get_irq_resource(ares, &agpio)) 335 return AE_OK; 336 337 handle = ACPI_HANDLE(chip->parent); 338 pin = agpio->pin_table[0]; 339 340 if (pin <= 255) { 341 char ev_name[5]; 342 sprintf(ev_name, "_%c%02hhX", 343 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', 344 pin); 345 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) 346 handler = acpi_gpio_irq_handler; 347 } 348 if (!handler) { 349 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) 350 handler = acpi_gpio_irq_handler_evt; 351 } 352 if (!handler) 353 return AE_OK; 354 355 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event"); 356 if (IS_ERR(desc)) { 357 dev_err(chip->parent, 358 "Failed to request GPIO for pin 0x%04X, err %ld\n", 359 pin, PTR_ERR(desc)); 360 return AE_OK; 361 } 362 363 ret = gpiochip_lock_as_irq(chip, pin); 364 if (ret) { 365 dev_err(chip->parent, 366 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n", 367 pin, ret); 368 goto fail_free_desc; 369 } 370 371 irq = gpiod_to_irq(desc); 372 if (irq < 0) { 373 dev_err(chip->parent, 374 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n", 375 pin, irq); 376 goto fail_unlock_irq; 377 } 378 379 event = kzalloc(sizeof(*event), GFP_KERNEL); 380 if (!event) 381 goto fail_unlock_irq; 382 383 event->irqflags = IRQF_ONESHOT; 384 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { 385 if (agpio->polarity == ACPI_ACTIVE_HIGH) 386 event->irqflags |= IRQF_TRIGGER_HIGH; 387 else 388 event->irqflags |= IRQF_TRIGGER_LOW; 389 } else { 390 switch (agpio->polarity) { 391 case ACPI_ACTIVE_HIGH: 392 event->irqflags |= IRQF_TRIGGER_RISING; 393 break; 394 case ACPI_ACTIVE_LOW: 395 event->irqflags |= IRQF_TRIGGER_FALLING; 396 break; 397 default: 398 event->irqflags |= IRQF_TRIGGER_RISING | 399 IRQF_TRIGGER_FALLING; 400 break; 401 } 402 } 403 404 event->handle = evt_handle; 405 event->handler = handler; 406 event->irq = irq; 407 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio); 408 event->pin = pin; 409 event->desc = desc; 410 411 list_add_tail(&event->node, &acpi_gpio->events); 412 413 return AE_OK; 414 415 fail_unlock_irq: 416 gpiochip_unlock_as_irq(chip, pin); 417 fail_free_desc: 418 gpiochip_free_own_desc(desc); 419 420 return AE_OK; 421 } 422 423 /** 424 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events 425 * @chip: GPIO chip 426 * 427 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are 428 * handled by ACPI event methods which need to be called from the GPIO 429 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which 430 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls 431 * the ACPI event methods for those pins. 432 */ 433 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) 434 { 435 struct acpi_gpio_chip *acpi_gpio; 436 acpi_handle handle; 437 acpi_status status; 438 bool defer; 439 440 if (!chip->parent || !chip->to_irq) 441 return; 442 443 handle = ACPI_HANDLE(chip->parent); 444 if (!handle) 445 return; 446 447 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); 448 if (ACPI_FAILURE(status)) 449 return; 450 451 acpi_walk_resources(handle, "_AEI", 452 acpi_gpiochip_alloc_event, acpi_gpio); 453 454 mutex_lock(&acpi_gpio_deferred_req_irqs_lock); 455 defer = !acpi_gpio_deferred_req_irqs_done; 456 if (defer) 457 list_add(&acpi_gpio->deferred_req_irqs_list_entry, 458 &acpi_gpio_deferred_req_irqs_list); 459 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); 460 461 if (defer) 462 return; 463 464 acpi_gpiochip_request_irqs(acpi_gpio); 465 } 466 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts); 467 468 /** 469 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. 470 * @chip: GPIO chip 471 * 472 * Free interrupts associated with GPIO ACPI event method for the given 473 * GPIO chip. 474 */ 475 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) 476 { 477 struct acpi_gpio_chip *acpi_gpio; 478 struct acpi_gpio_event *event, *ep; 479 acpi_handle handle; 480 acpi_status status; 481 482 if (!chip->parent || !chip->to_irq) 483 return; 484 485 handle = ACPI_HANDLE(chip->parent); 486 if (!handle) 487 return; 488 489 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); 490 if (ACPI_FAILURE(status)) 491 return; 492 493 mutex_lock(&acpi_gpio_deferred_req_irqs_lock); 494 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry)) 495 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry); 496 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); 497 498 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { 499 if (event->irq_requested) { 500 if (event->irq_is_wake) 501 disable_irq_wake(event->irq); 502 503 free_irq(event->irq, event); 504 } 505 506 gpiochip_unlock_as_irq(chip, event->pin); 507 gpiochip_free_own_desc(event->desc); 508 list_del(&event->node); 509 kfree(event); 510 } 511 } 512 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts); 513 514 int acpi_dev_add_driver_gpios(struct acpi_device *adev, 515 const struct acpi_gpio_mapping *gpios) 516 { 517 if (adev && gpios) { 518 adev->driver_gpios = gpios; 519 return 0; 520 } 521 return -EINVAL; 522 } 523 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios); 524 525 void acpi_dev_remove_driver_gpios(struct acpi_device *adev) 526 { 527 if (adev) 528 adev->driver_gpios = NULL; 529 } 530 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios); 531 532 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res) 533 { 534 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev)); 535 } 536 537 int devm_acpi_dev_add_driver_gpios(struct device *dev, 538 const struct acpi_gpio_mapping *gpios) 539 { 540 void *res; 541 int ret; 542 543 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL); 544 if (!res) 545 return -ENOMEM; 546 547 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios); 548 if (ret) { 549 devres_free(res); 550 return ret; 551 } 552 devres_add(dev, res); 553 return 0; 554 } 555 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios); 556 557 void devm_acpi_dev_remove_driver_gpios(struct device *dev) 558 { 559 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL)); 560 } 561 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios); 562 563 static bool acpi_get_driver_gpio_data(struct acpi_device *adev, 564 const char *name, int index, 565 struct fwnode_reference_args *args, 566 unsigned int *quirks) 567 { 568 const struct acpi_gpio_mapping *gm; 569 570 if (!adev->driver_gpios) 571 return false; 572 573 for (gm = adev->driver_gpios; gm->name; gm++) 574 if (!strcmp(name, gm->name) && gm->data && index < gm->size) { 575 const struct acpi_gpio_params *par = gm->data + index; 576 577 args->fwnode = acpi_fwnode_handle(adev); 578 args->args[0] = par->crs_entry_index; 579 args->args[1] = par->line_index; 580 args->args[2] = par->active_low; 581 args->nargs = 3; 582 583 *quirks = gm->quirks; 584 return true; 585 } 586 587 return false; 588 } 589 590 static int 591 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) 592 { 593 const enum gpiod_flags mask = 594 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT | 595 GPIOD_FLAGS_BIT_DIR_VAL; 596 int ret = 0; 597 598 /* 599 * Check if the BIOS has IoRestriction with explicitly set direction 600 * and update @flags accordingly. Otherwise use whatever caller asked 601 * for. 602 */ 603 if (update & GPIOD_FLAGS_BIT_DIR_SET) { 604 enum gpiod_flags diff = *flags ^ update; 605 606 /* 607 * Check if caller supplied incompatible GPIO initialization 608 * flags. 609 * 610 * Return %-EINVAL to notify that firmware has different 611 * settings and we are going to use them. 612 */ 613 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) || 614 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL))) 615 ret = -EINVAL; 616 *flags = (*flags & ~mask) | (update & mask); 617 } 618 return ret; 619 } 620 621 int 622 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) 623 { 624 struct device *dev = &info->adev->dev; 625 enum gpiod_flags old = *flags; 626 int ret; 627 628 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags); 629 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) { 630 if (ret) 631 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n"); 632 } else { 633 if (ret) 634 dev_dbg(dev, "Override GPIO initialization flags\n"); 635 *flags = old; 636 } 637 638 return ret; 639 } 640 641 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, 642 struct acpi_gpio_info *info) 643 { 644 switch (info->pin_config) { 645 case ACPI_PIN_CONFIG_PULLUP: 646 *lookupflags |= GPIO_PULL_UP; 647 break; 648 case ACPI_PIN_CONFIG_PULLDOWN: 649 *lookupflags |= GPIO_PULL_DOWN; 650 break; 651 default: 652 break; 653 } 654 655 if (info->polarity == GPIO_ACTIVE_LOW) 656 *lookupflags |= GPIO_ACTIVE_LOW; 657 658 return 0; 659 } 660 661 struct acpi_gpio_lookup { 662 struct acpi_gpio_info info; 663 int index; 664 u16 pin_index; 665 bool active_low; 666 struct gpio_desc *desc; 667 int n; 668 }; 669 670 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data) 671 { 672 struct acpi_gpio_lookup *lookup = data; 673 674 if (ares->type != ACPI_RESOURCE_TYPE_GPIO) 675 return 1; 676 677 if (!lookup->desc) { 678 const struct acpi_resource_gpio *agpio = &ares->data.gpio; 679 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; 680 u16 pin_index; 681 682 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint) 683 lookup->index++; 684 685 if (lookup->n++ != lookup->index) 686 return 1; 687 688 pin_index = lookup->pin_index; 689 if (pin_index >= agpio->pin_table_length) 690 return 1; 691 692 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, 693 agpio->pin_table[pin_index]); 694 lookup->info.pin_config = agpio->pin_config; 695 lookup->info.debounce = agpio->debounce_timeout; 696 lookup->info.gpioint = gpioint; 697 698 /* 699 * Polarity and triggering are only specified for GpioInt 700 * resource. 701 * Note: we expect here: 702 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW 703 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH 704 */ 705 if (lookup->info.gpioint) { 706 lookup->info.polarity = agpio->polarity; 707 lookup->info.triggering = agpio->triggering; 708 } else { 709 lookup->info.polarity = lookup->active_low; 710 } 711 712 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity); 713 } 714 715 return 1; 716 } 717 718 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup, 719 struct acpi_gpio_info *info) 720 { 721 struct acpi_device *adev = lookup->info.adev; 722 struct list_head res_list; 723 int ret; 724 725 INIT_LIST_HEAD(&res_list); 726 727 ret = acpi_dev_get_resources(adev, &res_list, 728 acpi_populate_gpio_lookup, 729 lookup); 730 if (ret < 0) 731 return ret; 732 733 acpi_dev_free_resource_list(&res_list); 734 735 if (!lookup->desc) 736 return -ENOENT; 737 738 if (info) 739 *info = lookup->info; 740 return 0; 741 } 742 743 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, 744 const char *propname, int index, 745 struct acpi_gpio_lookup *lookup) 746 { 747 struct fwnode_reference_args args; 748 unsigned int quirks = 0; 749 int ret; 750 751 memset(&args, 0, sizeof(args)); 752 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3, 753 &args); 754 if (ret) { 755 struct acpi_device *adev = to_acpi_device_node(fwnode); 756 757 if (!adev) 758 return ret; 759 760 if (!acpi_get_driver_gpio_data(adev, propname, index, &args, 761 &quirks)) 762 return ret; 763 } 764 /* 765 * The property was found and resolved, so need to lookup the GPIO based 766 * on returned args. 767 */ 768 if (!to_acpi_device_node(args.fwnode)) 769 return -EINVAL; 770 if (args.nargs != 3) 771 return -EPROTO; 772 773 lookup->index = args.args[0]; 774 lookup->pin_index = args.args[1]; 775 lookup->active_low = !!args.args[2]; 776 777 lookup->info.adev = to_acpi_device_node(args.fwnode); 778 lookup->info.quirks = quirks; 779 780 return 0; 781 } 782 783 /** 784 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources 785 * @adev: pointer to a ACPI device to get GPIO from 786 * @propname: Property name of the GPIO (optional) 787 * @index: index of GpioIo/GpioInt resource (starting from %0) 788 * @info: info pointer to fill in (optional) 789 * 790 * Function goes through ACPI resources for @adev and based on @index looks 791 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, 792 * and returns it. @index matches GpioIo/GpioInt resources only so if there 793 * are total %3 GPIO resources, the index goes from %0 to %2. 794 * 795 * If @propname is specified the GPIO is looked using device property. In 796 * that case @index is used to select the GPIO entry in the property value 797 * (in case of multiple). 798 * 799 * If the GPIO cannot be translated or there is an error, an ERR_PTR is 800 * returned. 801 * 802 * Note: if the GPIO resource has multiple entries in the pin list, this 803 * function only returns the first. 804 */ 805 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, 806 const char *propname, int index, 807 struct acpi_gpio_info *info) 808 { 809 struct acpi_gpio_lookup lookup; 810 int ret; 811 812 if (!adev) 813 return ERR_PTR(-ENODEV); 814 815 memset(&lookup, 0, sizeof(lookup)); 816 lookup.index = index; 817 818 if (propname) { 819 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname); 820 821 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev), 822 propname, index, &lookup); 823 if (ret) 824 return ERR_PTR(ret); 825 826 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n", 827 dev_name(&lookup.info.adev->dev), lookup.index, 828 lookup.pin_index, lookup.active_low); 829 } else { 830 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index); 831 lookup.info.adev = adev; 832 } 833 834 ret = acpi_gpio_resource_lookup(&lookup, info); 835 return ret ? ERR_PTR(ret) : lookup.desc; 836 } 837 838 static bool acpi_can_fallback_to_crs(struct acpi_device *adev, 839 const char *con_id) 840 { 841 /* Never allow fallback if the device has properties */ 842 if (acpi_dev_has_props(adev) || adev->driver_gpios) 843 return false; 844 845 return con_id == NULL; 846 } 847 848 struct gpio_desc *acpi_find_gpio(struct device *dev, 849 const char *con_id, 850 unsigned int idx, 851 enum gpiod_flags *dflags, 852 unsigned long *lookupflags) 853 { 854 struct acpi_device *adev = ACPI_COMPANION(dev); 855 struct acpi_gpio_info info; 856 struct gpio_desc *desc; 857 char propname[32]; 858 int i; 859 860 /* Try first from _DSD */ 861 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 862 if (con_id) { 863 snprintf(propname, sizeof(propname), "%s-%s", 864 con_id, gpio_suffixes[i]); 865 } else { 866 snprintf(propname, sizeof(propname), "%s", 867 gpio_suffixes[i]); 868 } 869 870 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); 871 if (!IS_ERR(desc)) 872 break; 873 if (PTR_ERR(desc) == -EPROBE_DEFER) 874 return ERR_CAST(desc); 875 } 876 877 /* Then from plain _CRS GPIOs */ 878 if (IS_ERR(desc)) { 879 if (!acpi_can_fallback_to_crs(adev, con_id)) 880 return ERR_PTR(-ENOENT); 881 882 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); 883 if (IS_ERR(desc)) 884 return desc; 885 } 886 887 if (info.gpioint && 888 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) { 889 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n"); 890 return ERR_PTR(-ENOENT); 891 } 892 893 acpi_gpio_update_gpiod_flags(dflags, &info); 894 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info); 895 return desc; 896 } 897 898 /** 899 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources 900 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from 901 * @propname: Property name of the GPIO 902 * @index: index of GpioIo/GpioInt resource (starting from %0) 903 * @info: info pointer to fill in (optional) 904 * 905 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. 906 * Otherwise (i.e. it is a data-only non-device object), use the property-based 907 * GPIO lookup to get to the GPIO resource with the relevant information and use 908 * that to obtain the GPIO descriptor to return. 909 * 910 * If the GPIO cannot be translated or there is an error an ERR_PTR is 911 * returned. 912 */ 913 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, 914 const char *propname, int index, 915 struct acpi_gpio_info *info) 916 { 917 struct acpi_gpio_lookup lookup; 918 struct acpi_device *adev; 919 int ret; 920 921 adev = to_acpi_device_node(fwnode); 922 if (adev) 923 return acpi_get_gpiod_by_index(adev, propname, index, info); 924 925 if (!is_acpi_data_node(fwnode)) 926 return ERR_PTR(-ENODEV); 927 928 if (!propname) 929 return ERR_PTR(-EINVAL); 930 931 memset(&lookup, 0, sizeof(lookup)); 932 lookup.index = index; 933 934 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); 935 if (ret) 936 return ERR_PTR(ret); 937 938 ret = acpi_gpio_resource_lookup(&lookup, info); 939 return ret ? ERR_PTR(ret) : lookup.desc; 940 } 941 942 /** 943 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number 944 * @adev: pointer to a ACPI device to get IRQ from 945 * @index: index of GpioInt resource (starting from %0) 946 * 947 * If the device has one or more GpioInt resources, this function can be 948 * used to translate from the GPIO offset in the resource to the Linux IRQ 949 * number. 950 * 951 * The function is idempotent, though each time it runs it will configure GPIO 952 * pin direction according to the flags in GpioInt resource. 953 * 954 * Return: Linux IRQ number (> %0) on success, negative errno on failure. 955 */ 956 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) 957 { 958 int idx, i; 959 unsigned int irq_flags; 960 int ret; 961 962 for (i = 0, idx = 0; idx <= index; i++) { 963 struct acpi_gpio_info info; 964 struct gpio_desc *desc; 965 966 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info); 967 968 /* Ignore -EPROBE_DEFER, it only matters if idx matches */ 969 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) 970 return PTR_ERR(desc); 971 972 if (info.gpioint && idx++ == index) { 973 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 974 enum gpiod_flags dflags = GPIOD_ASIS; 975 char label[32]; 976 int irq; 977 978 if (IS_ERR(desc)) 979 return PTR_ERR(desc); 980 981 irq = gpiod_to_irq(desc); 982 if (irq < 0) 983 return irq; 984 985 acpi_gpio_update_gpiod_flags(&dflags, &info); 986 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info); 987 988 snprintf(label, sizeof(label), "GpioInt() %d", index); 989 ret = gpiod_configure_flags(desc, label, lflags, dflags); 990 if (ret < 0) 991 return ret; 992 993 ret = gpio_set_debounce_timeout(desc, info.debounce); 994 if (ret) 995 return ret; 996 997 irq_flags = acpi_dev_get_irq_type(info.triggering, 998 info.polarity); 999 1000 /* Set type if specified and different than the current one */ 1001 if (irq_flags != IRQ_TYPE_NONE && 1002 irq_flags != irq_get_trigger_type(irq)) 1003 irq_set_irq_type(irq, irq_flags); 1004 1005 return irq; 1006 } 1007 1008 } 1009 return -ENOENT; 1010 } 1011 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get); 1012 1013 static acpi_status 1014 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, 1015 u32 bits, u64 *value, void *handler_context, 1016 void *region_context) 1017 { 1018 struct acpi_gpio_chip *achip = region_context; 1019 struct gpio_chip *chip = achip->chip; 1020 struct acpi_resource_gpio *agpio; 1021 struct acpi_resource *ares; 1022 u16 pin_index = address; 1023 acpi_status status; 1024 int length; 1025 int i; 1026 1027 status = acpi_buffer_to_resource(achip->conn_info.connection, 1028 achip->conn_info.length, &ares); 1029 if (ACPI_FAILURE(status)) 1030 return status; 1031 1032 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { 1033 ACPI_FREE(ares); 1034 return AE_BAD_PARAMETER; 1035 } 1036 1037 agpio = &ares->data.gpio; 1038 1039 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && 1040 function == ACPI_WRITE)) { 1041 ACPI_FREE(ares); 1042 return AE_BAD_PARAMETER; 1043 } 1044 1045 length = min_t(u16, agpio->pin_table_length, pin_index + bits); 1046 for (i = pin_index; i < length; ++i) { 1047 int pin = agpio->pin_table[i]; 1048 struct acpi_gpio_connection *conn; 1049 struct gpio_desc *desc; 1050 bool found; 1051 1052 mutex_lock(&achip->conn_lock); 1053 1054 found = false; 1055 list_for_each_entry(conn, &achip->conns, node) { 1056 if (conn->pin == pin) { 1057 found = true; 1058 desc = conn->desc; 1059 break; 1060 } 1061 } 1062 1063 /* 1064 * The same GPIO can be shared between operation region and 1065 * event but only if the access here is ACPI_READ. In that 1066 * case we "borrow" the event GPIO instead. 1067 */ 1068 if (!found && agpio->shareable == ACPI_SHARED && 1069 function == ACPI_READ) { 1070 struct acpi_gpio_event *event; 1071 1072 list_for_each_entry(event, &achip->events, node) { 1073 if (event->pin == pin) { 1074 desc = event->desc; 1075 found = true; 1076 break; 1077 } 1078 } 1079 } 1080 1081 if (!found) { 1082 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion"); 1083 if (IS_ERR(desc)) { 1084 mutex_unlock(&achip->conn_lock); 1085 status = AE_ERROR; 1086 goto out; 1087 } 1088 1089 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 1090 if (!conn) { 1091 gpiochip_free_own_desc(desc); 1092 mutex_unlock(&achip->conn_lock); 1093 status = AE_NO_MEMORY; 1094 goto out; 1095 } 1096 1097 conn->pin = pin; 1098 conn->desc = desc; 1099 list_add_tail(&conn->node, &achip->conns); 1100 } 1101 1102 mutex_unlock(&achip->conn_lock); 1103 1104 if (function == ACPI_WRITE) 1105 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i))); 1106 else 1107 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; 1108 } 1109 1110 out: 1111 ACPI_FREE(ares); 1112 return status; 1113 } 1114 1115 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) 1116 { 1117 struct gpio_chip *chip = achip->chip; 1118 acpi_handle handle = ACPI_HANDLE(chip->parent); 1119 acpi_status status; 1120 1121 INIT_LIST_HEAD(&achip->conns); 1122 mutex_init(&achip->conn_lock); 1123 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, 1124 acpi_gpio_adr_space_handler, 1125 NULL, achip); 1126 if (ACPI_FAILURE(status)) 1127 dev_err(chip->parent, 1128 "Failed to install GPIO OpRegion handler\n"); 1129 } 1130 1131 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) 1132 { 1133 struct gpio_chip *chip = achip->chip; 1134 acpi_handle handle = ACPI_HANDLE(chip->parent); 1135 struct acpi_gpio_connection *conn, *tmp; 1136 acpi_status status; 1137 1138 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, 1139 acpi_gpio_adr_space_handler); 1140 if (ACPI_FAILURE(status)) { 1141 dev_err(chip->parent, 1142 "Failed to remove GPIO OpRegion handler\n"); 1143 return; 1144 } 1145 1146 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { 1147 gpiochip_free_own_desc(conn->desc); 1148 list_del(&conn->node); 1149 kfree(conn); 1150 } 1151 } 1152 1153 static struct gpio_desc * 1154 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip, 1155 struct fwnode_handle *fwnode, 1156 const char **name, 1157 unsigned long *lflags, 1158 enum gpiod_flags *dflags) 1159 { 1160 struct gpio_chip *chip = achip->chip; 1161 struct gpio_desc *desc; 1162 u32 gpios[2]; 1163 int ret; 1164 1165 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT; 1166 *dflags = GPIOD_ASIS; 1167 *name = NULL; 1168 1169 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, 1170 ARRAY_SIZE(gpios)); 1171 if (ret < 0) 1172 return ERR_PTR(ret); 1173 1174 desc = gpiochip_get_desc(chip, gpios[0]); 1175 if (IS_ERR(desc)) 1176 return desc; 1177 1178 if (gpios[1]) 1179 *lflags |= GPIO_ACTIVE_LOW; 1180 1181 if (fwnode_property_present(fwnode, "input")) 1182 *dflags |= GPIOD_IN; 1183 else if (fwnode_property_present(fwnode, "output-low")) 1184 *dflags |= GPIOD_OUT_LOW; 1185 else if (fwnode_property_present(fwnode, "output-high")) 1186 *dflags |= GPIOD_OUT_HIGH; 1187 else 1188 return ERR_PTR(-EINVAL); 1189 1190 fwnode_property_read_string(fwnode, "line-name", name); 1191 1192 return desc; 1193 } 1194 1195 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip) 1196 { 1197 struct gpio_chip *chip = achip->chip; 1198 struct fwnode_handle *fwnode; 1199 1200 device_for_each_child_node(chip->parent, fwnode) { 1201 unsigned long lflags; 1202 enum gpiod_flags dflags; 1203 struct gpio_desc *desc; 1204 const char *name; 1205 int ret; 1206 1207 if (!fwnode_property_present(fwnode, "gpio-hog")) 1208 continue; 1209 1210 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name, 1211 &lflags, &dflags); 1212 if (IS_ERR(desc)) 1213 continue; 1214 1215 ret = gpiod_hog(desc, name, lflags, dflags); 1216 if (ret) { 1217 dev_err(chip->parent, "Failed to hog GPIO\n"); 1218 fwnode_handle_put(fwnode); 1219 return; 1220 } 1221 } 1222 } 1223 1224 void acpi_gpiochip_add(struct gpio_chip *chip) 1225 { 1226 struct acpi_gpio_chip *acpi_gpio; 1227 acpi_handle handle; 1228 acpi_status status; 1229 1230 if (!chip || !chip->parent) 1231 return; 1232 1233 handle = ACPI_HANDLE(chip->parent); 1234 if (!handle) 1235 return; 1236 1237 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); 1238 if (!acpi_gpio) { 1239 dev_err(chip->parent, 1240 "Failed to allocate memory for ACPI GPIO chip\n"); 1241 return; 1242 } 1243 1244 acpi_gpio->chip = chip; 1245 INIT_LIST_HEAD(&acpi_gpio->events); 1246 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry); 1247 1248 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); 1249 if (ACPI_FAILURE(status)) { 1250 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n"); 1251 kfree(acpi_gpio); 1252 return; 1253 } 1254 1255 acpi_gpiochip_request_regions(acpi_gpio); 1256 acpi_gpiochip_scan_gpios(acpi_gpio); 1257 acpi_walk_dep_device_list(handle); 1258 } 1259 1260 void acpi_gpiochip_remove(struct gpio_chip *chip) 1261 { 1262 struct acpi_gpio_chip *acpi_gpio; 1263 acpi_handle handle; 1264 acpi_status status; 1265 1266 if (!chip || !chip->parent) 1267 return; 1268 1269 handle = ACPI_HANDLE(chip->parent); 1270 if (!handle) 1271 return; 1272 1273 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); 1274 if (ACPI_FAILURE(status)) { 1275 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n"); 1276 return; 1277 } 1278 1279 acpi_gpiochip_free_regions(acpi_gpio); 1280 1281 acpi_detach_data(handle, acpi_gpio_chip_dh); 1282 kfree(acpi_gpio); 1283 } 1284 1285 static int acpi_gpio_package_count(const union acpi_object *obj) 1286 { 1287 const union acpi_object *element = obj->package.elements; 1288 const union acpi_object *end = element + obj->package.count; 1289 unsigned int count = 0; 1290 1291 while (element < end) { 1292 switch (element->type) { 1293 case ACPI_TYPE_LOCAL_REFERENCE: 1294 element += 3; 1295 fallthrough; 1296 case ACPI_TYPE_INTEGER: 1297 element++; 1298 count++; 1299 break; 1300 1301 default: 1302 return -EPROTO; 1303 } 1304 } 1305 1306 return count; 1307 } 1308 1309 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data) 1310 { 1311 unsigned int *count = data; 1312 1313 if (ares->type == ACPI_RESOURCE_TYPE_GPIO) 1314 *count += ares->data.gpio.pin_table_length; 1315 1316 return 1; 1317 } 1318 1319 /** 1320 * acpi_gpio_count - count the GPIOs associated with a device / function 1321 * @dev: GPIO consumer, can be %NULL for system-global GPIOs 1322 * @con_id: function within the GPIO consumer 1323 * 1324 * Return: 1325 * The number of GPIOs associated with a device / function or %-ENOENT, 1326 * if no GPIO has been assigned to the requested function. 1327 */ 1328 int acpi_gpio_count(struct device *dev, const char *con_id) 1329 { 1330 struct acpi_device *adev = ACPI_COMPANION(dev); 1331 const union acpi_object *obj; 1332 const struct acpi_gpio_mapping *gm; 1333 int count = -ENOENT; 1334 int ret; 1335 char propname[32]; 1336 unsigned int i; 1337 1338 /* Try first from _DSD */ 1339 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { 1340 if (con_id) 1341 snprintf(propname, sizeof(propname), "%s-%s", 1342 con_id, gpio_suffixes[i]); 1343 else 1344 snprintf(propname, sizeof(propname), "%s", 1345 gpio_suffixes[i]); 1346 1347 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY, 1348 &obj); 1349 if (ret == 0) { 1350 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) 1351 count = 1; 1352 else if (obj->type == ACPI_TYPE_PACKAGE) 1353 count = acpi_gpio_package_count(obj); 1354 } else if (adev->driver_gpios) { 1355 for (gm = adev->driver_gpios; gm->name; gm++) 1356 if (strcmp(propname, gm->name) == 0) { 1357 count = gm->size; 1358 break; 1359 } 1360 } 1361 if (count > 0) 1362 break; 1363 } 1364 1365 /* Then from plain _CRS GPIOs */ 1366 if (count < 0) { 1367 struct list_head resource_list; 1368 unsigned int crs_count = 0; 1369 1370 if (!acpi_can_fallback_to_crs(adev, con_id)) 1371 return count; 1372 1373 INIT_LIST_HEAD(&resource_list); 1374 acpi_dev_get_resources(adev, &resource_list, 1375 acpi_find_gpio_count, &crs_count); 1376 acpi_dev_free_resource_list(&resource_list); 1377 if (crs_count > 0) 1378 count = crs_count; 1379 } 1380 return count ? count : -ENOENT; 1381 } 1382 1383 /* Run deferred acpi_gpiochip_request_irqs() */ 1384 static int __init acpi_gpio_handle_deferred_request_irqs(void) 1385 { 1386 struct acpi_gpio_chip *acpi_gpio, *tmp; 1387 1388 mutex_lock(&acpi_gpio_deferred_req_irqs_lock); 1389 list_for_each_entry_safe(acpi_gpio, tmp, 1390 &acpi_gpio_deferred_req_irqs_list, 1391 deferred_req_irqs_list_entry) 1392 acpi_gpiochip_request_irqs(acpi_gpio); 1393 1394 acpi_gpio_deferred_req_irqs_done = true; 1395 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock); 1396 1397 return 0; 1398 } 1399 /* We must use _sync so that this runs after the first deferred_probe run */ 1400 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs); 1401 1402 static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = { 1403 { 1404 /* 1405 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for 1406 * a non existing micro-USB-B connector which puts the HDMI 1407 * DDC pins in GPIO mode, breaking HDMI support. 1408 */ 1409 .matches = { 1410 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"), 1411 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"), 1412 }, 1413 .driver_data = &(struct acpi_gpiolib_dmi_quirk) { 1414 .no_edge_events_on_boot = true, 1415 }, 1416 }, 1417 { 1418 /* 1419 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which 1420 * instead of controlling the actual micro-USB-B turns the 5V 1421 * boost for its USB-A connector off. The actual micro-USB-B 1422 * connector is wired for charging only. 1423 */ 1424 .matches = { 1425 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"), 1426 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"), 1427 }, 1428 .driver_data = &(struct acpi_gpiolib_dmi_quirk) { 1429 .no_edge_events_on_boot = true, 1430 }, 1431 }, 1432 { 1433 /* 1434 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an 1435 * external embedded-controller connected via I2C + an ACPI GPIO 1436 * event handler on INT33FF:01 pin 0, causing spurious wakeups. 1437 * When suspending by closing the LID, the power to the USB 1438 * keyboard is turned off, causing INT0002 ACPI events to 1439 * trigger once the XHCI controller notices the keyboard is 1440 * gone. So INT0002 events cause spurious wakeups too. Ignoring 1441 * EC wakes breaks wakeup when opening the lid, the user needs 1442 * to press the power-button to wakeup the system. The 1443 * alternative is suspend simply not working, which is worse. 1444 */ 1445 .matches = { 1446 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 1447 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"), 1448 }, 1449 .driver_data = &(struct acpi_gpiolib_dmi_quirk) { 1450 .ignore_wake = "INT33FF:01@0,INT0002:00@2", 1451 }, 1452 }, 1453 { 1454 /* 1455 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an 1456 * external embedded-controller connected via I2C + an ACPI GPIO 1457 * event handler on INT33FC:02 pin 28, causing spurious wakeups. 1458 */ 1459 .matches = { 1460 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 1461 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"), 1462 DMI_MATCH(DMI_BOARD_NAME, "815D"), 1463 }, 1464 .driver_data = &(struct acpi_gpiolib_dmi_quirk) { 1465 .ignore_wake = "INT33FC:02@28", 1466 }, 1467 }, 1468 { 1469 /* 1470 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an 1471 * external embedded-controller connected via I2C + an ACPI GPIO 1472 * event handler on INT33FF:01 pin 0, causing spurious wakeups. 1473 */ 1474 .matches = { 1475 DMI_MATCH(DMI_SYS_VENDOR, "HP"), 1476 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"), 1477 DMI_MATCH(DMI_BOARD_NAME, "813E"), 1478 }, 1479 .driver_data = &(struct acpi_gpiolib_dmi_quirk) { 1480 .ignore_wake = "INT33FF:01@0", 1481 }, 1482 }, 1483 {} /* Terminating entry */ 1484 }; 1485 1486 static int __init acpi_gpio_setup_params(void) 1487 { 1488 const struct acpi_gpiolib_dmi_quirk *quirk = NULL; 1489 const struct dmi_system_id *id; 1490 1491 id = dmi_first_match(gpiolib_acpi_quirks); 1492 if (id) 1493 quirk = id->driver_data; 1494 1495 if (run_edge_events_on_boot < 0) { 1496 if (quirk && quirk->no_edge_events_on_boot) 1497 run_edge_events_on_boot = 0; 1498 else 1499 run_edge_events_on_boot = 1; 1500 } 1501 1502 if (ignore_wake == NULL && quirk && quirk->ignore_wake) 1503 ignore_wake = quirk->ignore_wake; 1504 1505 return 0; 1506 } 1507 1508 /* Directly after dmi_setup() which runs as core_initcall() */ 1509 postcore_initcall(acpi_gpio_setup_params); 1510