xref: /openbmc/linux/drivers/gpio/gpiolib-acpi.c (revision 8795a739)
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 /**
30  * struct acpi_gpio_event - ACPI GPIO event handler data
31  *
32  * @node:	  list-entry of the events list of the struct acpi_gpio_chip
33  * @handle:	  handle of ACPI method to execute when the IRQ triggers
34  * @handler:	  handler function to pass to request_irq() when requesting the IRQ
35  * @pin:	  GPIO pin number on the struct gpio_chip
36  * @irq:	  Linux IRQ number for the event, for request_irq() / free_irq()
37  * @irqflags:	  flags to pass to request_irq() when requesting the IRQ
38  * @irq_is_wake:  If the ACPI flags indicate the IRQ is a wakeup source
39  * @irq_requested:True if request_irq() has been done
40  * @desc:	  struct gpio_desc for the GPIO pin for this event
41  */
42 struct acpi_gpio_event {
43 	struct list_head node;
44 	acpi_handle handle;
45 	irq_handler_t handler;
46 	unsigned int pin;
47 	unsigned int irq;
48 	unsigned long irqflags;
49 	bool irq_is_wake;
50 	bool irq_requested;
51 	struct gpio_desc *desc;
52 };
53 
54 struct acpi_gpio_connection {
55 	struct list_head node;
56 	unsigned int pin;
57 	struct gpio_desc *desc;
58 };
59 
60 struct acpi_gpio_chip {
61 	/*
62 	 * ACPICA requires that the first field of the context parameter
63 	 * passed to acpi_install_address_space_handler() is large enough
64 	 * to hold struct acpi_connection_info.
65 	 */
66 	struct acpi_connection_info conn_info;
67 	struct list_head conns;
68 	struct mutex conn_lock;
69 	struct gpio_chip *chip;
70 	struct list_head events;
71 	struct list_head deferred_req_irqs_list_entry;
72 };
73 
74 /*
75  * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
76  * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
77  * late_initcall_sync() handler, so that other builtin drivers can register their
78  * OpRegions before the event handlers can run. This list contains GPIO chips
79  * for which the acpi_gpiochip_request_irqs() call has been deferred.
80  */
81 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
82 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
83 static bool acpi_gpio_deferred_req_irqs_done;
84 
85 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
86 {
87 	if (!gc->parent)
88 		return false;
89 
90 	return ACPI_HANDLE(gc->parent) == data;
91 }
92 
93 /**
94  * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
95  * @path:	ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
96  * @pin:	ACPI GPIO pin number (0-based, controller-relative)
97  *
98  * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
99  * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
100  * controller does not have GPIO chip registered at the moment. This is to
101  * support probe deferral.
102  */
103 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
104 {
105 	struct gpio_chip *chip;
106 	acpi_handle handle;
107 	acpi_status status;
108 
109 	status = acpi_get_handle(NULL, path, &handle);
110 	if (ACPI_FAILURE(status))
111 		return ERR_PTR(-ENODEV);
112 
113 	chip = gpiochip_find(handle, acpi_gpiochip_find);
114 	if (!chip)
115 		return ERR_PTR(-EPROBE_DEFER);
116 
117 	return gpiochip_get_desc(chip, pin);
118 }
119 
120 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
121 {
122 	struct acpi_gpio_event *event = data;
123 
124 	acpi_evaluate_object(event->handle, NULL, NULL, NULL);
125 
126 	return IRQ_HANDLED;
127 }
128 
129 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
130 {
131 	struct acpi_gpio_event *event = data;
132 
133 	acpi_execute_simple_method(event->handle, NULL, event->pin);
134 
135 	return IRQ_HANDLED;
136 }
137 
138 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
139 {
140 	/* The address of this function is used as a key. */
141 }
142 
143 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
144 				struct acpi_resource_gpio **agpio)
145 {
146 	struct acpi_resource_gpio *gpio;
147 
148 	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
149 		return false;
150 
151 	gpio = &ares->data.gpio;
152 	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
153 		return false;
154 
155 	*agpio = gpio;
156 	return true;
157 }
158 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
159 
160 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
161 				      struct acpi_gpio_event *event)
162 {
163 	int ret, value;
164 
165 	ret = request_threaded_irq(event->irq, NULL, event->handler,
166 				   event->irqflags, "ACPI:Event", event);
167 	if (ret) {
168 		dev_err(acpi_gpio->chip->parent,
169 			"Failed to setup interrupt handler for %d\n",
170 			event->irq);
171 		return;
172 	}
173 
174 	if (event->irq_is_wake)
175 		enable_irq_wake(event->irq);
176 
177 	event->irq_requested = true;
178 
179 	/* Make sure we trigger the initial state of edge-triggered IRQs */
180 	if (run_edge_events_on_boot &&
181 	    (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
182 		value = gpiod_get_raw_value_cansleep(event->desc);
183 		if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
184 		    ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
185 			event->handler(event->irq, event);
186 	}
187 }
188 
189 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
190 {
191 	struct acpi_gpio_event *event;
192 
193 	list_for_each_entry(event, &acpi_gpio->events, node)
194 		acpi_gpiochip_request_irq(acpi_gpio, event);
195 }
196 
197 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
198 					     void *context)
199 {
200 	struct acpi_gpio_chip *acpi_gpio = context;
201 	struct gpio_chip *chip = acpi_gpio->chip;
202 	struct acpi_resource_gpio *agpio;
203 	acpi_handle handle, evt_handle;
204 	struct acpi_gpio_event *event;
205 	irq_handler_t handler = NULL;
206 	struct gpio_desc *desc;
207 	int ret, pin, irq;
208 
209 	if (!acpi_gpio_get_irq_resource(ares, &agpio))
210 		return AE_OK;
211 
212 	handle = ACPI_HANDLE(chip->parent);
213 	pin = agpio->pin_table[0];
214 
215 	if (pin <= 255) {
216 		char ev_name[5];
217 		sprintf(ev_name, "_%c%02hhX",
218 			agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
219 			pin);
220 		if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
221 			handler = acpi_gpio_irq_handler;
222 	}
223 	if (!handler) {
224 		if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
225 			handler = acpi_gpio_irq_handler_evt;
226 	}
227 	if (!handler)
228 		return AE_OK;
229 
230 	desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event",
231 					 GPIO_ACTIVE_HIGH, GPIOD_IN);
232 	if (IS_ERR(desc)) {
233 		dev_err(chip->parent, "Failed to request GPIO\n");
234 		return AE_ERROR;
235 	}
236 
237 	ret = gpiochip_lock_as_irq(chip, pin);
238 	if (ret) {
239 		dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
240 		goto fail_free_desc;
241 	}
242 
243 	irq = gpiod_to_irq(desc);
244 	if (irq < 0) {
245 		dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
246 		goto fail_unlock_irq;
247 	}
248 
249 	event = kzalloc(sizeof(*event), GFP_KERNEL);
250 	if (!event)
251 		goto fail_unlock_irq;
252 
253 	event->irqflags = IRQF_ONESHOT;
254 	if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
255 		if (agpio->polarity == ACPI_ACTIVE_HIGH)
256 			event->irqflags |= IRQF_TRIGGER_HIGH;
257 		else
258 			event->irqflags |= IRQF_TRIGGER_LOW;
259 	} else {
260 		switch (agpio->polarity) {
261 		case ACPI_ACTIVE_HIGH:
262 			event->irqflags |= IRQF_TRIGGER_RISING;
263 			break;
264 		case ACPI_ACTIVE_LOW:
265 			event->irqflags |= IRQF_TRIGGER_FALLING;
266 			break;
267 		default:
268 			event->irqflags |= IRQF_TRIGGER_RISING |
269 					   IRQF_TRIGGER_FALLING;
270 			break;
271 		}
272 	}
273 
274 	event->handle = evt_handle;
275 	event->handler = handler;
276 	event->irq = irq;
277 	event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
278 	event->pin = pin;
279 	event->desc = desc;
280 
281 	list_add_tail(&event->node, &acpi_gpio->events);
282 
283 	return AE_OK;
284 
285 fail_unlock_irq:
286 	gpiochip_unlock_as_irq(chip, pin);
287 fail_free_desc:
288 	gpiochip_free_own_desc(desc);
289 
290 	return AE_ERROR;
291 }
292 
293 /**
294  * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
295  * @chip:      GPIO chip
296  *
297  * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
298  * handled by ACPI event methods which need to be called from the GPIO
299  * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
300  * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
301  * the ACPI event methods for those pins.
302  */
303 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
304 {
305 	struct acpi_gpio_chip *acpi_gpio;
306 	acpi_handle handle;
307 	acpi_status status;
308 	bool defer;
309 
310 	if (!chip->parent || !chip->to_irq)
311 		return;
312 
313 	handle = ACPI_HANDLE(chip->parent);
314 	if (!handle)
315 		return;
316 
317 	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
318 	if (ACPI_FAILURE(status))
319 		return;
320 
321 	acpi_walk_resources(handle, "_AEI",
322 			    acpi_gpiochip_alloc_event, acpi_gpio);
323 
324 	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
325 	defer = !acpi_gpio_deferred_req_irqs_done;
326 	if (defer)
327 		list_add(&acpi_gpio->deferred_req_irqs_list_entry,
328 			 &acpi_gpio_deferred_req_irqs_list);
329 	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
330 
331 	if (defer)
332 		return;
333 
334 	acpi_gpiochip_request_irqs(acpi_gpio);
335 }
336 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
337 
338 /**
339  * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
340  * @chip:      GPIO chip
341  *
342  * Free interrupts associated with GPIO ACPI event method for the given
343  * GPIO chip.
344  */
345 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
346 {
347 	struct acpi_gpio_chip *acpi_gpio;
348 	struct acpi_gpio_event *event, *ep;
349 	acpi_handle handle;
350 	acpi_status status;
351 
352 	if (!chip->parent || !chip->to_irq)
353 		return;
354 
355 	handle = ACPI_HANDLE(chip->parent);
356 	if (!handle)
357 		return;
358 
359 	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
360 	if (ACPI_FAILURE(status))
361 		return;
362 
363 	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
364 	if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
365 		list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
366 	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
367 
368 	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
369 		if (event->irq_requested) {
370 			if (event->irq_is_wake)
371 				disable_irq_wake(event->irq);
372 
373 			free_irq(event->irq, event);
374 		}
375 
376 		gpiochip_unlock_as_irq(chip, event->pin);
377 		gpiochip_free_own_desc(event->desc);
378 		list_del(&event->node);
379 		kfree(event);
380 	}
381 }
382 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
383 
384 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
385 			      const struct acpi_gpio_mapping *gpios)
386 {
387 	if (adev && gpios) {
388 		adev->driver_gpios = gpios;
389 		return 0;
390 	}
391 	return -EINVAL;
392 }
393 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
394 
395 void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
396 {
397 	if (adev)
398 		adev->driver_gpios = NULL;
399 }
400 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
401 
402 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
403 {
404 	acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
405 }
406 
407 int devm_acpi_dev_add_driver_gpios(struct device *dev,
408 				   const struct acpi_gpio_mapping *gpios)
409 {
410 	void *res;
411 	int ret;
412 
413 	res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
414 	if (!res)
415 		return -ENOMEM;
416 
417 	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
418 	if (ret) {
419 		devres_free(res);
420 		return ret;
421 	}
422 	devres_add(dev, res);
423 	return 0;
424 }
425 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
426 
427 void devm_acpi_dev_remove_driver_gpios(struct device *dev)
428 {
429 	WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
430 }
431 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
432 
433 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
434 				      const char *name, int index,
435 				      struct fwnode_reference_args *args,
436 				      unsigned int *quirks)
437 {
438 	const struct acpi_gpio_mapping *gm;
439 
440 	if (!adev->driver_gpios)
441 		return false;
442 
443 	for (gm = adev->driver_gpios; gm->name; gm++)
444 		if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
445 			const struct acpi_gpio_params *par = gm->data + index;
446 
447 			args->fwnode = acpi_fwnode_handle(adev);
448 			args->args[0] = par->crs_entry_index;
449 			args->args[1] = par->line_index;
450 			args->args[2] = par->active_low;
451 			args->nargs = 3;
452 
453 			*quirks = gm->quirks;
454 			return true;
455 		}
456 
457 	return false;
458 }
459 
460 static enum gpiod_flags
461 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
462 {
463 	switch (agpio->io_restriction) {
464 	case ACPI_IO_RESTRICT_INPUT:
465 		return GPIOD_IN;
466 	case ACPI_IO_RESTRICT_OUTPUT:
467 		/*
468 		 * ACPI GPIO resources don't contain an initial value for the
469 		 * GPIO. Therefore we deduce that value from the pull field
470 		 * instead. If the pin is pulled up we assume default to be
471 		 * high, if it is pulled down we assume default to be low,
472 		 * otherwise we leave pin untouched.
473 		 */
474 		switch (agpio->pin_config) {
475 		case ACPI_PIN_CONFIG_PULLUP:
476 			return GPIOD_OUT_HIGH;
477 		case ACPI_PIN_CONFIG_PULLDOWN:
478 			return GPIOD_OUT_LOW;
479 		default:
480 			break;
481 		}
482 	default:
483 		break;
484 	}
485 
486 	/*
487 	 * Assume that the BIOS has configured the direction and pull
488 	 * accordingly.
489 	 */
490 	return GPIOD_ASIS;
491 }
492 
493 static int
494 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
495 {
496 	const enum gpiod_flags mask =
497 		GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
498 		GPIOD_FLAGS_BIT_DIR_VAL;
499 	int ret = 0;
500 
501 	/*
502 	 * Check if the BIOS has IoRestriction with explicitly set direction
503 	 * and update @flags accordingly. Otherwise use whatever caller asked
504 	 * for.
505 	 */
506 	if (update & GPIOD_FLAGS_BIT_DIR_SET) {
507 		enum gpiod_flags diff = *flags ^ update;
508 
509 		/*
510 		 * Check if caller supplied incompatible GPIO initialization
511 		 * flags.
512 		 *
513 		 * Return %-EINVAL to notify that firmware has different
514 		 * settings and we are going to use them.
515 		 */
516 		if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
517 		    ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
518 			ret = -EINVAL;
519 		*flags = (*flags & ~mask) | (update & mask);
520 	}
521 	return ret;
522 }
523 
524 int
525 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
526 {
527 	struct device *dev = &info->adev->dev;
528 	enum gpiod_flags old = *flags;
529 	int ret;
530 
531 	ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
532 	if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
533 		if (ret)
534 			dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
535 	} else {
536 		if (ret)
537 			dev_dbg(dev, "Override GPIO initialization flags\n");
538 		*flags = old;
539 	}
540 
541 	return ret;
542 }
543 
544 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
545 					struct acpi_gpio_info *info)
546 {
547 	switch (info->pin_config) {
548 	case ACPI_PIN_CONFIG_PULLUP:
549 		*lookupflags |= GPIO_PULL_UP;
550 		break;
551 	case ACPI_PIN_CONFIG_PULLDOWN:
552 		*lookupflags |= GPIO_PULL_DOWN;
553 		break;
554 	default:
555 		break;
556 	}
557 
558 	if (info->polarity == GPIO_ACTIVE_LOW)
559 		*lookupflags |= GPIO_ACTIVE_LOW;
560 
561 	return 0;
562 }
563 
564 struct acpi_gpio_lookup {
565 	struct acpi_gpio_info info;
566 	int index;
567 	int pin_index;
568 	bool active_low;
569 	struct gpio_desc *desc;
570 	int n;
571 };
572 
573 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
574 {
575 	struct acpi_gpio_lookup *lookup = data;
576 
577 	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
578 		return 1;
579 
580 	if (!lookup->desc) {
581 		const struct acpi_resource_gpio *agpio = &ares->data.gpio;
582 		bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
583 		int pin_index;
584 
585 		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
586 			lookup->index++;
587 
588 		if (lookup->n++ != lookup->index)
589 			return 1;
590 
591 		pin_index = lookup->pin_index;
592 		if (pin_index >= agpio->pin_table_length)
593 			return 1;
594 
595 		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
596 					      agpio->pin_table[pin_index]);
597 		lookup->info.pin_config = agpio->pin_config;
598 		lookup->info.gpioint = gpioint;
599 
600 		/*
601 		 * Polarity and triggering are only specified for GpioInt
602 		 * resource.
603 		 * Note: we expect here:
604 		 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
605 		 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
606 		 */
607 		if (lookup->info.gpioint) {
608 			lookup->info.flags = GPIOD_IN;
609 			lookup->info.polarity = agpio->polarity;
610 			lookup->info.triggering = agpio->triggering;
611 		} else {
612 			lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
613 			lookup->info.polarity = lookup->active_low;
614 		}
615 	}
616 
617 	return 1;
618 }
619 
620 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
621 				     struct acpi_gpio_info *info)
622 {
623 	struct acpi_device *adev = lookup->info.adev;
624 	struct list_head res_list;
625 	int ret;
626 
627 	INIT_LIST_HEAD(&res_list);
628 
629 	ret = acpi_dev_get_resources(adev, &res_list,
630 				     acpi_populate_gpio_lookup,
631 				     lookup);
632 	if (ret < 0)
633 		return ret;
634 
635 	acpi_dev_free_resource_list(&res_list);
636 
637 	if (!lookup->desc)
638 		return -ENOENT;
639 
640 	if (info)
641 		*info = lookup->info;
642 	return 0;
643 }
644 
645 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
646 				     const char *propname, int index,
647 				     struct acpi_gpio_lookup *lookup)
648 {
649 	struct fwnode_reference_args args;
650 	unsigned int quirks = 0;
651 	int ret;
652 
653 	memset(&args, 0, sizeof(args));
654 	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
655 						 &args);
656 	if (ret) {
657 		struct acpi_device *adev = to_acpi_device_node(fwnode);
658 
659 		if (!adev)
660 			return ret;
661 
662 		if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
663 					       &quirks))
664 			return ret;
665 	}
666 	/*
667 	 * The property was found and resolved, so need to lookup the GPIO based
668 	 * on returned args.
669 	 */
670 	if (!to_acpi_device_node(args.fwnode))
671 		return -EINVAL;
672 	if (args.nargs != 3)
673 		return -EPROTO;
674 
675 	lookup->index = args.args[0];
676 	lookup->pin_index = args.args[1];
677 	lookup->active_low = !!args.args[2];
678 
679 	lookup->info.adev = to_acpi_device_node(args.fwnode);
680 	lookup->info.quirks = quirks;
681 
682 	return 0;
683 }
684 
685 /**
686  * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
687  * @adev: pointer to a ACPI device to get GPIO from
688  * @propname: Property name of the GPIO (optional)
689  * @index: index of GpioIo/GpioInt resource (starting from %0)
690  * @info: info pointer to fill in (optional)
691  *
692  * Function goes through ACPI resources for @adev and based on @index looks
693  * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
694  * and returns it. @index matches GpioIo/GpioInt resources only so if there
695  * are total %3 GPIO resources, the index goes from %0 to %2.
696  *
697  * If @propname is specified the GPIO is looked using device property. In
698  * that case @index is used to select the GPIO entry in the property value
699  * (in case of multiple).
700  *
701  * If the GPIO cannot be translated or there is an error, an ERR_PTR is
702  * returned.
703  *
704  * Note: if the GPIO resource has multiple entries in the pin list, this
705  * function only returns the first.
706  */
707 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
708 					  const char *propname, int index,
709 					  struct acpi_gpio_info *info)
710 {
711 	struct acpi_gpio_lookup lookup;
712 	int ret;
713 
714 	if (!adev)
715 		return ERR_PTR(-ENODEV);
716 
717 	memset(&lookup, 0, sizeof(lookup));
718 	lookup.index = index;
719 
720 	if (propname) {
721 		dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
722 
723 		ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
724 						propname, index, &lookup);
725 		if (ret)
726 			return ERR_PTR(ret);
727 
728 		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
729 			dev_name(&lookup.info.adev->dev), lookup.index,
730 			lookup.pin_index, lookup.active_low);
731 	} else {
732 		dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
733 		lookup.info.adev = adev;
734 	}
735 
736 	ret = acpi_gpio_resource_lookup(&lookup, info);
737 	return ret ? ERR_PTR(ret) : lookup.desc;
738 }
739 
740 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
741 				     const char *con_id)
742 {
743 	/* Never allow fallback if the device has properties */
744 	if (acpi_dev_has_props(adev) || adev->driver_gpios)
745 		return false;
746 
747 	return con_id == NULL;
748 }
749 
750 struct gpio_desc *acpi_find_gpio(struct device *dev,
751 				 const char *con_id,
752 				 unsigned int idx,
753 				 enum gpiod_flags *dflags,
754 				 unsigned long *lookupflags)
755 {
756 	struct acpi_device *adev = ACPI_COMPANION(dev);
757 	struct acpi_gpio_info info;
758 	struct gpio_desc *desc;
759 	char propname[32];
760 	int i;
761 
762 	/* Try first from _DSD */
763 	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
764 		if (con_id) {
765 			snprintf(propname, sizeof(propname), "%s-%s",
766 				 con_id, gpio_suffixes[i]);
767 		} else {
768 			snprintf(propname, sizeof(propname), "%s",
769 				 gpio_suffixes[i]);
770 		}
771 
772 		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
773 		if (!IS_ERR(desc))
774 			break;
775 		if (PTR_ERR(desc) == -EPROBE_DEFER)
776 			return ERR_CAST(desc);
777 	}
778 
779 	/* Then from plain _CRS GPIOs */
780 	if (IS_ERR(desc)) {
781 		if (!acpi_can_fallback_to_crs(adev, con_id))
782 			return ERR_PTR(-ENOENT);
783 
784 		desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
785 		if (IS_ERR(desc))
786 			return desc;
787 	}
788 
789 	if (info.gpioint &&
790 	    (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
791 		dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
792 		return ERR_PTR(-ENOENT);
793 	}
794 
795 	acpi_gpio_update_gpiod_flags(dflags, &info);
796 	acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
797 	return desc;
798 }
799 
800 /**
801  * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
802  * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
803  * @propname: Property name of the GPIO
804  * @index: index of GpioIo/GpioInt resource (starting from %0)
805  * @info: info pointer to fill in (optional)
806  *
807  * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
808  * Otherwise (i.e. it is a data-only non-device object), use the property-based
809  * GPIO lookup to get to the GPIO resource with the relevant information and use
810  * that to obtain the GPIO descriptor to return.
811  *
812  * If the GPIO cannot be translated or there is an error an ERR_PTR is
813  * returned.
814  */
815 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
816 				      const char *propname, int index,
817 				      struct acpi_gpio_info *info)
818 {
819 	struct acpi_gpio_lookup lookup;
820 	struct acpi_device *adev;
821 	int ret;
822 
823 	adev = to_acpi_device_node(fwnode);
824 	if (adev)
825 		return acpi_get_gpiod_by_index(adev, propname, index, info);
826 
827 	if (!is_acpi_data_node(fwnode))
828 		return ERR_PTR(-ENODEV);
829 
830 	if (!propname)
831 		return ERR_PTR(-EINVAL);
832 
833 	memset(&lookup, 0, sizeof(lookup));
834 	lookup.index = index;
835 
836 	ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
837 	if (ret)
838 		return ERR_PTR(ret);
839 
840 	ret = acpi_gpio_resource_lookup(&lookup, info);
841 	return ret ? ERR_PTR(ret) : lookup.desc;
842 }
843 
844 /**
845  * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
846  * @adev: pointer to a ACPI device to get IRQ from
847  * @index: index of GpioInt resource (starting from %0)
848  *
849  * If the device has one or more GpioInt resources, this function can be
850  * used to translate from the GPIO offset in the resource to the Linux IRQ
851  * number.
852  *
853  * The function is idempotent, though each time it runs it will configure GPIO
854  * pin direction according to the flags in GpioInt resource.
855  *
856  * Return: Linux IRQ number (> %0) on success, negative errno on failure.
857  */
858 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
859 {
860 	int idx, i;
861 	unsigned int irq_flags;
862 	int ret;
863 
864 	for (i = 0, idx = 0; idx <= index; i++) {
865 		struct acpi_gpio_info info;
866 		struct gpio_desc *desc;
867 
868 		desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
869 
870 		/* Ignore -EPROBE_DEFER, it only matters if idx matches */
871 		if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
872 			return PTR_ERR(desc);
873 
874 		if (info.gpioint && idx++ == index) {
875 			unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
876 			char label[32];
877 			int irq;
878 
879 			if (IS_ERR(desc))
880 				return PTR_ERR(desc);
881 
882 			irq = gpiod_to_irq(desc);
883 			if (irq < 0)
884 				return irq;
885 
886 			snprintf(label, sizeof(label), "GpioInt() %d", index);
887 			ret = gpiod_configure_flags(desc, label, lflags, info.flags);
888 			if (ret < 0)
889 				return ret;
890 
891 			irq_flags = acpi_dev_get_irq_type(info.triggering,
892 							  info.polarity);
893 
894 			/* Set type if specified and different than the current one */
895 			if (irq_flags != IRQ_TYPE_NONE &&
896 			    irq_flags != irq_get_trigger_type(irq))
897 				irq_set_irq_type(irq, irq_flags);
898 
899 			return irq;
900 		}
901 
902 	}
903 	return -ENOENT;
904 }
905 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
906 
907 static acpi_status
908 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
909 			    u32 bits, u64 *value, void *handler_context,
910 			    void *region_context)
911 {
912 	struct acpi_gpio_chip *achip = region_context;
913 	struct gpio_chip *chip = achip->chip;
914 	struct acpi_resource_gpio *agpio;
915 	struct acpi_resource *ares;
916 	int pin_index = (int)address;
917 	acpi_status status;
918 	int length;
919 	int i;
920 
921 	status = acpi_buffer_to_resource(achip->conn_info.connection,
922 					 achip->conn_info.length, &ares);
923 	if (ACPI_FAILURE(status))
924 		return status;
925 
926 	if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
927 		ACPI_FREE(ares);
928 		return AE_BAD_PARAMETER;
929 	}
930 
931 	agpio = &ares->data.gpio;
932 
933 	if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
934 	    function == ACPI_WRITE)) {
935 		ACPI_FREE(ares);
936 		return AE_BAD_PARAMETER;
937 	}
938 
939 	length = min(agpio->pin_table_length, (u16)(pin_index + bits));
940 	for (i = pin_index; i < length; ++i) {
941 		int pin = agpio->pin_table[i];
942 		struct acpi_gpio_connection *conn;
943 		struct gpio_desc *desc;
944 		bool found;
945 
946 		mutex_lock(&achip->conn_lock);
947 
948 		found = false;
949 		list_for_each_entry(conn, &achip->conns, node) {
950 			if (conn->pin == pin) {
951 				found = true;
952 				desc = conn->desc;
953 				break;
954 			}
955 		}
956 
957 		/*
958 		 * The same GPIO can be shared between operation region and
959 		 * event but only if the access here is ACPI_READ. In that
960 		 * case we "borrow" the event GPIO instead.
961 		 */
962 		if (!found && agpio->shareable == ACPI_SHARED &&
963 		     function == ACPI_READ) {
964 			struct acpi_gpio_event *event;
965 
966 			list_for_each_entry(event, &achip->events, node) {
967 				if (event->pin == pin) {
968 					desc = event->desc;
969 					found = true;
970 					break;
971 				}
972 			}
973 		}
974 
975 		if (!found) {
976 			enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
977 			const char *label = "ACPI:OpRegion";
978 
979 			desc = gpiochip_request_own_desc(chip, pin, label,
980 							 GPIO_ACTIVE_HIGH,
981 							 flags);
982 			if (IS_ERR(desc)) {
983 				status = AE_ERROR;
984 				mutex_unlock(&achip->conn_lock);
985 				goto out;
986 			}
987 
988 			conn = kzalloc(sizeof(*conn), GFP_KERNEL);
989 			if (!conn) {
990 				status = AE_NO_MEMORY;
991 				gpiochip_free_own_desc(desc);
992 				mutex_unlock(&achip->conn_lock);
993 				goto out;
994 			}
995 
996 			conn->pin = pin;
997 			conn->desc = desc;
998 			list_add_tail(&conn->node, &achip->conns);
999 		}
1000 
1001 		mutex_unlock(&achip->conn_lock);
1002 
1003 		if (function == ACPI_WRITE)
1004 			gpiod_set_raw_value_cansleep(desc,
1005 						     !!((1 << i) & *value));
1006 		else
1007 			*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1008 	}
1009 
1010 out:
1011 	ACPI_FREE(ares);
1012 	return status;
1013 }
1014 
1015 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1016 {
1017 	struct gpio_chip *chip = achip->chip;
1018 	acpi_handle handle = ACPI_HANDLE(chip->parent);
1019 	acpi_status status;
1020 
1021 	INIT_LIST_HEAD(&achip->conns);
1022 	mutex_init(&achip->conn_lock);
1023 	status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1024 						    acpi_gpio_adr_space_handler,
1025 						    NULL, achip);
1026 	if (ACPI_FAILURE(status))
1027 		dev_err(chip->parent,
1028 		        "Failed to install GPIO OpRegion handler\n");
1029 }
1030 
1031 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1032 {
1033 	struct gpio_chip *chip = achip->chip;
1034 	acpi_handle handle = ACPI_HANDLE(chip->parent);
1035 	struct acpi_gpio_connection *conn, *tmp;
1036 	acpi_status status;
1037 
1038 	status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1039 						   acpi_gpio_adr_space_handler);
1040 	if (ACPI_FAILURE(status)) {
1041 		dev_err(chip->parent,
1042 			"Failed to remove GPIO OpRegion handler\n");
1043 		return;
1044 	}
1045 
1046 	list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1047 		gpiochip_free_own_desc(conn->desc);
1048 		list_del(&conn->node);
1049 		kfree(conn);
1050 	}
1051 }
1052 
1053 static struct gpio_desc *
1054 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1055 			     struct fwnode_handle *fwnode,
1056 			     const char **name,
1057 			     unsigned long *lflags,
1058 			     enum gpiod_flags *dflags)
1059 {
1060 	struct gpio_chip *chip = achip->chip;
1061 	struct gpio_desc *desc;
1062 	u32 gpios[2];
1063 	int ret;
1064 
1065 	*lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1066 	*dflags = 0;
1067 	*name = NULL;
1068 
1069 	ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1070 					     ARRAY_SIZE(gpios));
1071 	if (ret < 0)
1072 		return ERR_PTR(ret);
1073 
1074 	desc = gpiochip_get_desc(chip, gpios[0]);
1075 	if (IS_ERR(desc))
1076 		return desc;
1077 
1078 	if (gpios[1])
1079 		*lflags |= GPIO_ACTIVE_LOW;
1080 
1081 	if (fwnode_property_present(fwnode, "input"))
1082 		*dflags |= GPIOD_IN;
1083 	else if (fwnode_property_present(fwnode, "output-low"))
1084 		*dflags |= GPIOD_OUT_LOW;
1085 	else if (fwnode_property_present(fwnode, "output-high"))
1086 		*dflags |= GPIOD_OUT_HIGH;
1087 	else
1088 		return ERR_PTR(-EINVAL);
1089 
1090 	fwnode_property_read_string(fwnode, "line-name", name);
1091 
1092 	return desc;
1093 }
1094 
1095 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1096 {
1097 	struct gpio_chip *chip = achip->chip;
1098 	struct fwnode_handle *fwnode;
1099 
1100 	device_for_each_child_node(chip->parent, fwnode) {
1101 		unsigned long lflags;
1102 		enum gpiod_flags dflags;
1103 		struct gpio_desc *desc;
1104 		const char *name;
1105 		int ret;
1106 
1107 		if (!fwnode_property_present(fwnode, "gpio-hog"))
1108 			continue;
1109 
1110 		desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1111 						    &lflags, &dflags);
1112 		if (IS_ERR(desc))
1113 			continue;
1114 
1115 		ret = gpiod_hog(desc, name, lflags, dflags);
1116 		if (ret) {
1117 			dev_err(chip->parent, "Failed to hog GPIO\n");
1118 			fwnode_handle_put(fwnode);
1119 			return;
1120 		}
1121 	}
1122 }
1123 
1124 void acpi_gpiochip_add(struct gpio_chip *chip)
1125 {
1126 	struct acpi_gpio_chip *acpi_gpio;
1127 	acpi_handle handle;
1128 	acpi_status status;
1129 
1130 	if (!chip || !chip->parent)
1131 		return;
1132 
1133 	handle = ACPI_HANDLE(chip->parent);
1134 	if (!handle)
1135 		return;
1136 
1137 	acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1138 	if (!acpi_gpio) {
1139 		dev_err(chip->parent,
1140 			"Failed to allocate memory for ACPI GPIO chip\n");
1141 		return;
1142 	}
1143 
1144 	acpi_gpio->chip = chip;
1145 	INIT_LIST_HEAD(&acpi_gpio->events);
1146 	INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1147 
1148 	status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
1149 	if (ACPI_FAILURE(status)) {
1150 		dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1151 		kfree(acpi_gpio);
1152 		return;
1153 	}
1154 
1155 	if (!chip->names)
1156 		devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
1157 
1158 	acpi_gpiochip_request_regions(acpi_gpio);
1159 	acpi_gpiochip_scan_gpios(acpi_gpio);
1160 	acpi_walk_dep_device_list(handle);
1161 }
1162 
1163 void acpi_gpiochip_remove(struct gpio_chip *chip)
1164 {
1165 	struct acpi_gpio_chip *acpi_gpio;
1166 	acpi_handle handle;
1167 	acpi_status status;
1168 
1169 	if (!chip || !chip->parent)
1170 		return;
1171 
1172 	handle = ACPI_HANDLE(chip->parent);
1173 	if (!handle)
1174 		return;
1175 
1176 	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1177 	if (ACPI_FAILURE(status)) {
1178 		dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1179 		return;
1180 	}
1181 
1182 	acpi_gpiochip_free_regions(acpi_gpio);
1183 
1184 	acpi_detach_data(handle, acpi_gpio_chip_dh);
1185 	kfree(acpi_gpio);
1186 }
1187 
1188 static int acpi_gpio_package_count(const union acpi_object *obj)
1189 {
1190 	const union acpi_object *element = obj->package.elements;
1191 	const union acpi_object *end = element + obj->package.count;
1192 	unsigned int count = 0;
1193 
1194 	while (element < end) {
1195 		switch (element->type) {
1196 		case ACPI_TYPE_LOCAL_REFERENCE:
1197 			element += 3;
1198 			/* Fallthrough */
1199 		case ACPI_TYPE_INTEGER:
1200 			element++;
1201 			count++;
1202 			break;
1203 
1204 		default:
1205 			return -EPROTO;
1206 		}
1207 	}
1208 
1209 	return count;
1210 }
1211 
1212 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1213 {
1214 	unsigned int *count = data;
1215 
1216 	if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1217 		*count += ares->data.gpio.pin_table_length;
1218 
1219 	return 1;
1220 }
1221 
1222 /**
1223  * acpi_gpio_count - count the GPIOs associated with a device / function
1224  * @dev:	GPIO consumer, can be %NULL for system-global GPIOs
1225  * @con_id:	function within the GPIO consumer
1226  *
1227  * Return:
1228  * The number of GPIOs associated with a device / function or %-ENOENT,
1229  * if no GPIO has been assigned to the requested function.
1230  */
1231 int acpi_gpio_count(struct device *dev, const char *con_id)
1232 {
1233 	struct acpi_device *adev = ACPI_COMPANION(dev);
1234 	const union acpi_object *obj;
1235 	const struct acpi_gpio_mapping *gm;
1236 	int count = -ENOENT;
1237 	int ret;
1238 	char propname[32];
1239 	unsigned int i;
1240 
1241 	/* Try first from _DSD */
1242 	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1243 		if (con_id)
1244 			snprintf(propname, sizeof(propname), "%s-%s",
1245 				 con_id, gpio_suffixes[i]);
1246 		else
1247 			snprintf(propname, sizeof(propname), "%s",
1248 				 gpio_suffixes[i]);
1249 
1250 		ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1251 					    &obj);
1252 		if (ret == 0) {
1253 			if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1254 				count = 1;
1255 			else if (obj->type == ACPI_TYPE_PACKAGE)
1256 				count = acpi_gpio_package_count(obj);
1257 		} else if (adev->driver_gpios) {
1258 			for (gm = adev->driver_gpios; gm->name; gm++)
1259 				if (strcmp(propname, gm->name) == 0) {
1260 					count = gm->size;
1261 					break;
1262 				}
1263 		}
1264 		if (count > 0)
1265 			break;
1266 	}
1267 
1268 	/* Then from plain _CRS GPIOs */
1269 	if (count < 0) {
1270 		struct list_head resource_list;
1271 		unsigned int crs_count = 0;
1272 
1273 		if (!acpi_can_fallback_to_crs(adev, con_id))
1274 			return count;
1275 
1276 		INIT_LIST_HEAD(&resource_list);
1277 		acpi_dev_get_resources(adev, &resource_list,
1278 				       acpi_find_gpio_count, &crs_count);
1279 		acpi_dev_free_resource_list(&resource_list);
1280 		if (crs_count > 0)
1281 			count = crs_count;
1282 	}
1283 	return count ? count : -ENOENT;
1284 }
1285 
1286 /* Run deferred acpi_gpiochip_request_irqs() */
1287 static int acpi_gpio_handle_deferred_request_irqs(void)
1288 {
1289 	struct acpi_gpio_chip *acpi_gpio, *tmp;
1290 
1291 	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1292 	list_for_each_entry_safe(acpi_gpio, tmp,
1293 				 &acpi_gpio_deferred_req_irqs_list,
1294 				 deferred_req_irqs_list_entry)
1295 		acpi_gpiochip_request_irqs(acpi_gpio);
1296 
1297 	acpi_gpio_deferred_req_irqs_done = true;
1298 	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1299 
1300 	return 0;
1301 }
1302 /* We must use _sync so that this runs after the first deferred_probe run */
1303 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1304 
1305 static const struct dmi_system_id run_edge_events_on_boot_blacklist[] = {
1306 	{
1307 		.matches = {
1308 			DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1309 			DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1310 		}
1311 	},
1312 	{} /* Terminating entry */
1313 };
1314 
1315 static int acpi_gpio_setup_params(void)
1316 {
1317 	if (run_edge_events_on_boot < 0) {
1318 		if (dmi_check_system(run_edge_events_on_boot_blacklist))
1319 			run_edge_events_on_boot = 0;
1320 		else
1321 			run_edge_events_on_boot = 1;
1322 	}
1323 
1324 	return 0;
1325 }
1326 
1327 /* Directly after dmi_setup() which runs as core_initcall() */
1328 postcore_initcall(acpi_gpio_setup_params);
1329