drivers/gpio/gpiolib-acpi.c

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