Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1672 insertions, 0 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
new file mode 100644
index 000000000..33d73687e
--- /dev/null
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -0,0 +1,1672 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACPI helpers for GPIO API
+ *
+ * Copyright (C) 2012, Intel Corporation
+ * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
+ *          Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/dmi.h>
+#include <linux/errno.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
+#include <linux/export.h>
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#include "gpiolib.h"
+#include "gpiolib-acpi.h"
+
+static int run_edge_events_on_boot = -1;
+module_param(run_edge_events_on_boot, int, 0444);
+MODULE_PARM_DESC(run_edge_events_on_boot,
+		 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
+
+static char *ignore_wake;
+module_param(ignore_wake, charp, 0444);
+MODULE_PARM_DESC(ignore_wake,
+		 "controller@pin combos on which to ignore the ACPI wake flag "
+		 "ignore_wake=controller@pin[,controller@pin[,...]]");
+
+static char *ignore_interrupt;
+module_param(ignore_interrupt, charp, 0444);
+MODULE_PARM_DESC(ignore_interrupt,
+		 "controller@pin combos on which to ignore interrupt "
+		 "ignore_interrupt=controller@pin[,controller@pin[,...]]");
+
+struct acpi_gpiolib_dmi_quirk {
+	bool no_edge_events_on_boot;
+	char *ignore_wake;
+	char *ignore_interrupt;
+};
+
+/**
+ * struct acpi_gpio_event - ACPI GPIO event handler data
+ *
+ * @node:	  list-entry of the events list of the struct acpi_gpio_chip
+ * @handle:	  handle of ACPI method to execute when the IRQ triggers
+ * @handler:	  handler function to pass to request_irq() when requesting the IRQ
+ * @pin:	  GPIO pin number on the struct gpio_chip
+ * @irq:	  Linux IRQ number for the event, for request_irq() / free_irq()
+ * @irqflags:	  flags to pass to request_irq() when requesting the IRQ
+ * @irq_is_wake:  If the ACPI flags indicate the IRQ is a wakeup source
+ * @irq_requested:True if request_irq() has been done
+ * @desc:	  struct gpio_desc for the GPIO pin for this event
+ */
+struct acpi_gpio_event {
+	struct list_head node;
+	acpi_handle handle;
+	irq_handler_t handler;
+	unsigned int pin;
+	unsigned int irq;
+	unsigned long irqflags;
+	bool irq_is_wake;
+	bool irq_requested;
+	struct gpio_desc *desc;
+};
+
+struct acpi_gpio_connection {
+	struct list_head node;
+	unsigned int pin;
+	struct gpio_desc *desc;
+};
+
+struct acpi_gpio_chip {
+	/*
+	 * ACPICA requires that the first field of the context parameter
+	 * passed to acpi_install_address_space_handler() is large enough
+	 * to hold struct acpi_connection_info.
+	 */
+	struct acpi_connection_info conn_info;
+	struct list_head conns;
+	struct mutex conn_lock;
+	struct gpio_chip *chip;
+	struct list_head events;
+	struct list_head deferred_req_irqs_list_entry;
+};
+
+/*
+ * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
+ * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
+ * late_initcall_sync() handler, so that other builtin drivers can register their
+ * OpRegions before the event handlers can run. This list contains GPIO chips
+ * for which the acpi_gpiochip_request_irqs() call has been deferred.
+ */
+static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
+static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
+static bool acpi_gpio_deferred_req_irqs_done;
+
+static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
+{
+	return gc->parent && device_match_acpi_handle(gc->parent, data);
+}
+
+/**
+ * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
+ * @path:	ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
+ * @pin:	ACPI GPIO pin number (0-based, controller-relative)
+ *
+ * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
+ * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
+ * controller does not have GPIO chip registered at the moment. This is to
+ * support probe deferral.
+ */
+static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
+{
+	struct gpio_chip *chip;
+	acpi_handle handle;
+	acpi_status status;
+
+	status = acpi_get_handle(NULL, path, &handle);
+	if (ACPI_FAILURE(status))
+		return ERR_PTR(-ENODEV);
+
+	chip = gpiochip_find(handle, acpi_gpiochip_find);
+	if (!chip)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	return gpiochip_get_desc(chip, pin);
+}
+
+/**
+ * acpi_get_and_request_gpiod - Translate ACPI GPIO pin to GPIO descriptor and
+ *                              hold a refcount to the GPIO device.
+ * @path:      ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
+ * @pin:       ACPI GPIO pin number (0-based, controller-relative)
+ * @label:     Label to pass to gpiod_request()
+ *
+ * This function is a simple pass-through to acpi_get_gpiod(), except that
+ * as it is intended for use outside of the GPIO layer (in a similar fashion to
+ * gpiod_get_index() for example) it also holds a reference to the GPIO device.
+ */
+struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label)
+{
+	struct gpio_desc *gpio;
+	int ret;
+
+	gpio = acpi_get_gpiod(path, pin);
+	if (IS_ERR(gpio))
+		return gpio;
+
+	ret = gpiod_request(gpio, label);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return gpio;
+}
+EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod);
+
+static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
+{
+	struct acpi_gpio_event *event = data;
+
+	acpi_evaluate_object(event->handle, NULL, NULL, NULL);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
+{
+	struct acpi_gpio_event *event = data;
+
+	acpi_execute_simple_method(event->handle, NULL, event->pin);
+
+	return IRQ_HANDLED;
+}
+
+static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
+{
+	/* The address of this function is used as a key. */
+}
+
+bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
+				struct acpi_resource_gpio **agpio)
+{
+	struct acpi_resource_gpio *gpio;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+		return false;
+
+	gpio = &ares->data.gpio;
+	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
+		return false;
+
+	*agpio = gpio;
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
+
+/**
+ * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
+ *			       I/O resource or return False if not.
+ * @ares:	Pointer to the ACPI resource to fetch
+ * @agpio:	Pointer to a &struct acpi_resource_gpio to store the output pointer
+ */
+bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+			       struct acpi_resource_gpio **agpio)
+{
+	struct acpi_resource_gpio *gpio;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+		return false;
+
+	gpio = &ares->data.gpio;
+	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
+		return false;
+
+	*agpio = gpio;
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
+
+static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
+				      struct acpi_gpio_event *event)
+{
+	struct device *parent = acpi_gpio->chip->parent;
+	int ret, value;
+
+	ret = request_threaded_irq(event->irq, NULL, event->handler,
+				   event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
+	if (ret) {
+		dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
+		return;
+	}
+
+	if (event->irq_is_wake)
+		enable_irq_wake(event->irq);
+
+	event->irq_requested = true;
+
+	/* Make sure we trigger the initial state of edge-triggered IRQs */
+	if (run_edge_events_on_boot &&
+	    (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
+		value = gpiod_get_raw_value_cansleep(event->desc);
+		if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
+		    ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
+			event->handler(event->irq, event);
+	}
+}
+
+static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
+{
+	struct acpi_gpio_event *event;
+
+	list_for_each_entry(event, &acpi_gpio->events, node)
+		acpi_gpiochip_request_irq(acpi_gpio, event);
+}
+
+static enum gpiod_flags
+acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
+{
+	/* GpioInt() implies input configuration */
+	if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
+		return GPIOD_IN;
+
+	switch (agpio->io_restriction) {
+	case ACPI_IO_RESTRICT_INPUT:
+		return GPIOD_IN;
+	case ACPI_IO_RESTRICT_OUTPUT:
+		/*
+		 * ACPI GPIO resources don't contain an initial value for the
+		 * GPIO. Therefore we deduce that value from the pull field
+		 * and the polarity instead. If the pin is pulled up we assume
+		 * default to be high, if it is pulled down we assume default
+		 * to be low, otherwise we leave pin untouched. For active low
+		 * polarity values will be switched. See also
+		 * Documentation/firmware-guide/acpi/gpio-properties.rst.
+		 */
+		switch (agpio->pin_config) {
+		case ACPI_PIN_CONFIG_PULLUP:
+			return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
+		case ACPI_PIN_CONFIG_PULLDOWN:
+			return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * Assume that the BIOS has configured the direction and pull
+	 * accordingly.
+	 */
+	return GPIOD_ASIS;
+}
+
+static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
+						struct acpi_resource_gpio *agpio,
+						unsigned int index,
+						const char *label)
+{
+	int polarity = GPIO_ACTIVE_HIGH;
+	enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
+	unsigned int pin = agpio->pin_table[index];
+	struct gpio_desc *desc;
+	int ret;
+
+	desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
+	if (IS_ERR(desc))
+		return desc;
+
+	/* ACPI uses hundredths of milliseconds units */
+	ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
+	if (ret)
+		dev_warn(chip->parent,
+			 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
+			 pin, ret);
+
+	return desc;
+}
+
+static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
+				     unsigned int pin_in)
+{
+	const char *controller, *pin_str;
+	unsigned int pin;
+	char *endp;
+	int len;
+
+	controller = ignore_list;
+	while (controller) {
+		pin_str = strchr(controller, '@');
+		if (!pin_str)
+			goto err;
+
+		len = pin_str - controller;
+		if (len == strlen(controller_in) &&
+		    strncmp(controller, controller_in, len) == 0) {
+			pin = simple_strtoul(pin_str + 1, &endp, 10);
+			if (*endp != 0 && *endp != ',')
+				goto err;
+
+			if (pin == pin_in)
+				return true;
+		}
+
+		controller = strchr(controller, ',');
+		if (controller)
+			controller++;
+	}
+
+	return false;
+err:
+	pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
+	return false;
+}
+
+static bool acpi_gpio_irq_is_wake(struct device *parent,
+				  const struct acpi_resource_gpio *agpio)
+{
+	unsigned int pin = agpio->pin_table[0];
+
+	if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
+		return false;
+
+	if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
+		dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
+		return false;
+	}
+
+	return true;
+}
+
+/* Always returns AE_OK so that we keep looping over the resources */
+static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
+					     void *context)
+{
+	struct acpi_gpio_chip *acpi_gpio = context;
+	struct gpio_chip *chip = acpi_gpio->chip;
+	struct acpi_resource_gpio *agpio;
+	acpi_handle handle, evt_handle;
+	struct acpi_gpio_event *event;
+	irq_handler_t handler = NULL;
+	struct gpio_desc *desc;
+	unsigned int pin;
+	int ret, irq;
+
+	if (!acpi_gpio_get_irq_resource(ares, &agpio))
+		return AE_OK;
+
+	handle = ACPI_HANDLE(chip->parent);
+	pin = agpio->pin_table[0];
+
+	if (pin <= 255) {
+		char ev_name[8];
+		sprintf(ev_name, "_%c%02X",
+			agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
+			pin);
+		if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
+			handler = acpi_gpio_irq_handler;
+	}
+	if (!handler) {
+		if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
+			handler = acpi_gpio_irq_handler_evt;
+	}
+	if (!handler)
+		return AE_OK;
+
+	desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
+	if (IS_ERR(desc)) {
+		dev_err(chip->parent,
+			"Failed to request GPIO for pin 0x%04X, err %ld\n",
+			pin, PTR_ERR(desc));
+		return AE_OK;
+	}
+
+	ret = gpiochip_lock_as_irq(chip, pin);
+	if (ret) {
+		dev_err(chip->parent,
+			"Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
+			pin, ret);
+		goto fail_free_desc;
+	}
+
+	irq = gpiod_to_irq(desc);
+	if (irq < 0) {
+		dev_err(chip->parent,
+			"Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
+			pin, irq);
+		goto fail_unlock_irq;
+	}
+
+	if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
+		dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
+		return AE_OK;
+	}
+
+	event = kzalloc(sizeof(*event), GFP_KERNEL);
+	if (!event)
+		goto fail_unlock_irq;
+
+	event->irqflags = IRQF_ONESHOT;
+	if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
+		if (agpio->polarity == ACPI_ACTIVE_HIGH)
+			event->irqflags |= IRQF_TRIGGER_HIGH;
+		else
+			event->irqflags |= IRQF_TRIGGER_LOW;
+	} else {
+		switch (agpio->polarity) {
+		case ACPI_ACTIVE_HIGH:
+			event->irqflags |= IRQF_TRIGGER_RISING;
+			break;
+		case ACPI_ACTIVE_LOW:
+			event->irqflags |= IRQF_TRIGGER_FALLING;
+			break;
+		default:
+			event->irqflags |= IRQF_TRIGGER_RISING |
+					   IRQF_TRIGGER_FALLING;
+			break;
+		}
+	}
+
+	event->handle = evt_handle;
+	event->handler = handler;
+	event->irq = irq;
+	event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
+	event->pin = pin;
+	event->desc = desc;
+
+	list_add_tail(&event->node, &acpi_gpio->events);
+
+	return AE_OK;
+
+fail_unlock_irq:
+	gpiochip_unlock_as_irq(chip, pin);
+fail_free_desc:
+	gpiochip_free_own_desc(desc);
+
+	return AE_OK;
+}
+
+/**
+ * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
+ * @chip:      GPIO chip
+ *
+ * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
+ * handled by ACPI event methods which need to be called from the GPIO
+ * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
+ * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
+ * the ACPI event methods for those pins.
+ */
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
+{
+	struct acpi_gpio_chip *acpi_gpio;
+	acpi_handle handle;
+	acpi_status status;
+	bool defer;
+
+	if (!chip->parent || !chip->to_irq)
+		return;
+
+	handle = ACPI_HANDLE(chip->parent);
+	if (!handle)
+		return;
+
+	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+	if (ACPI_FAILURE(status))
+		return;
+
+	acpi_walk_resources(handle, "_AEI",
+			    acpi_gpiochip_alloc_event, acpi_gpio);
+
+	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+	defer = !acpi_gpio_deferred_req_irqs_done;
+	if (defer)
+		list_add(&acpi_gpio->deferred_req_irqs_list_entry,
+			 &acpi_gpio_deferred_req_irqs_list);
+	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+	if (defer)
+		return;
+
+	acpi_gpiochip_request_irqs(acpi_gpio);
+}
+EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
+
+/**
+ * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
+ * @chip:      GPIO chip
+ *
+ * Free interrupts associated with GPIO ACPI event method for the given
+ * GPIO chip.
+ */
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+{
+	struct acpi_gpio_chip *acpi_gpio;
+	struct acpi_gpio_event *event, *ep;
+	acpi_handle handle;
+	acpi_status status;
+
+	if (!chip->parent || !chip->to_irq)
+		return;
+
+	handle = ACPI_HANDLE(chip->parent);
+	if (!handle)
+		return;
+
+	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+	if (ACPI_FAILURE(status))
+		return;
+
+	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+	if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
+		list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
+	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
+		if (event->irq_requested) {
+			if (event->irq_is_wake)
+				disable_irq_wake(event->irq);
+
+			free_irq(event->irq, event);
+		}
+
+		gpiochip_unlock_as_irq(chip, event->pin);
+		gpiochip_free_own_desc(event->desc);
+		list_del(&event->node);
+		kfree(event);
+	}
+}
+EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
+
+int acpi_dev_add_driver_gpios(struct acpi_device *adev,
+			      const struct acpi_gpio_mapping *gpios)
+{
+	if (adev && gpios) {
+		adev->driver_gpios = gpios;
+		return 0;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
+
+void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
+{
+	if (adev)
+		adev->driver_gpios = NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
+
+static void acpi_dev_release_driver_gpios(void *adev)
+{
+	acpi_dev_remove_driver_gpios(adev);
+}
+
+int devm_acpi_dev_add_driver_gpios(struct device *dev,
+				   const struct acpi_gpio_mapping *gpios)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	int ret;
+
+	ret = acpi_dev_add_driver_gpios(adev, gpios);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
+}
+EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
+
+static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
+				      const char *name, int index,
+				      struct fwnode_reference_args *args,
+				      unsigned int *quirks)
+{
+	const struct acpi_gpio_mapping *gm;
+
+	if (!adev->driver_gpios)
+		return false;
+
+	for (gm = adev->driver_gpios; gm->name; gm++)
+		if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
+			const struct acpi_gpio_params *par = gm->data + index;
+
+			args->fwnode = acpi_fwnode_handle(adev);
+			args->args[0] = par->crs_entry_index;
+			args->args[1] = par->line_index;
+			args->args[2] = par->active_low;
+			args->nargs = 3;
+
+			*quirks = gm->quirks;
+			return true;
+		}
+
+	return false;
+}
+
+static int
+__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
+{
+	const enum gpiod_flags mask =
+		GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
+		GPIOD_FLAGS_BIT_DIR_VAL;
+	int ret = 0;
+
+	/*
+	 * Check if the BIOS has IoRestriction with explicitly set direction
+	 * and update @flags accordingly. Otherwise use whatever caller asked
+	 * for.
+	 */
+	if (update & GPIOD_FLAGS_BIT_DIR_SET) {
+		enum gpiod_flags diff = *flags ^ update;
+
+		/*
+		 * Check if caller supplied incompatible GPIO initialization
+		 * flags.
+		 *
+		 * Return %-EINVAL to notify that firmware has different
+		 * settings and we are going to use them.
+		 */
+		if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
+		    ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
+			ret = -EINVAL;
+		*flags = (*flags & ~mask) | (update & mask);
+	}
+	return ret;
+}
+
+int
+acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
+{
+	struct device *dev = &info->adev->dev;
+	enum gpiod_flags old = *flags;
+	int ret;
+
+	ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
+	if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
+		if (ret)
+			dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
+	} else {
+		if (ret)
+			dev_dbg(dev, "Override GPIO initialization flags\n");
+		*flags = old;
+	}
+
+	return ret;
+}
+
+int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
+					struct acpi_gpio_info *info)
+{
+	switch (info->pin_config) {
+	case ACPI_PIN_CONFIG_PULLUP:
+		*lookupflags |= GPIO_PULL_UP;
+		break;
+	case ACPI_PIN_CONFIG_PULLDOWN:
+		*lookupflags |= GPIO_PULL_DOWN;
+		break;
+	case ACPI_PIN_CONFIG_NOPULL:
+		*lookupflags |= GPIO_PULL_DISABLE;
+		break;
+	default:
+		break;
+	}
+
+	if (info->polarity == GPIO_ACTIVE_LOW)
+		*lookupflags |= GPIO_ACTIVE_LOW;
+
+	return 0;
+}
+
+struct acpi_gpio_lookup {
+	struct acpi_gpio_info info;
+	int index;
+	u16 pin_index;
+	bool active_low;
+	struct gpio_desc *desc;
+	int n;
+};
+
+static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
+{
+	struct acpi_gpio_lookup *lookup = data;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+		return 1;
+
+	if (!lookup->desc) {
+		const struct acpi_resource_gpio *agpio = &ares->data.gpio;
+		bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+		struct gpio_desc *desc;
+		u16 pin_index;
+
+		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
+			lookup->index++;
+
+		if (lookup->n++ != lookup->index)
+			return 1;
+
+		pin_index = lookup->pin_index;
+		if (pin_index >= agpio->pin_table_length)
+			return 1;
+
+		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
+			desc = gpio_to_desc(agpio->pin_table[pin_index]);
+		else
+			desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
+					      agpio->pin_table[pin_index]);
+		lookup->desc = desc;
+		lookup->info.pin_config = agpio->pin_config;
+		lookup->info.debounce = agpio->debounce_timeout;
+		lookup->info.gpioint = gpioint;
+		lookup->info.wake_capable = acpi_gpio_irq_is_wake(&lookup->info.adev->dev, agpio);
+
+		/*
+		 * Polarity and triggering are only specified for GpioInt
+		 * resource.
+		 * Note: we expect here:
+		 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
+		 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
+		 */
+		if (lookup->info.gpioint) {
+			lookup->info.polarity = agpio->polarity;
+			lookup->info.triggering = agpio->triggering;
+		} else {
+			lookup->info.polarity = lookup->active_low;
+		}
+
+		lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
+	}
+
+	return 1;
+}
+
+static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
+				     struct acpi_gpio_info *info)
+{
+	struct acpi_device *adev = lookup->info.adev;
+	struct list_head res_list;
+	int ret;
+
+	INIT_LIST_HEAD(&res_list);
+
+	ret = acpi_dev_get_resources(adev, &res_list,
+				     acpi_populate_gpio_lookup,
+				     lookup);
+	if (ret < 0)
+		return ret;
+
+	acpi_dev_free_resource_list(&res_list);
+
+	if (!lookup->desc)
+		return -ENOENT;
+
+	if (info)
+		*info = lookup->info;
+	return 0;
+}
+
+static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
+				     const char *propname, int index,
+				     struct acpi_gpio_lookup *lookup)
+{
+	struct fwnode_reference_args args;
+	unsigned int quirks = 0;
+	int ret;
+
+	memset(&args, 0, sizeof(args));
+	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
+						 &args);
+	if (ret) {
+		struct acpi_device *adev = to_acpi_device_node(fwnode);
+
+		if (!adev)
+			return ret;
+
+		if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
+					       &quirks))
+			return ret;
+	}
+	/*
+	 * The property was found and resolved, so need to lookup the GPIO based
+	 * on returned args.
+	 */
+	if (!to_acpi_device_node(args.fwnode))
+		return -EINVAL;
+	if (args.nargs != 3)
+		return -EPROTO;
+
+	lookup->index = args.args[0];
+	lookup->pin_index = args.args[1];
+	lookup->active_low = !!args.args[2];
+
+	lookup->info.adev = to_acpi_device_node(args.fwnode);
+	lookup->info.quirks = quirks;
+
+	return 0;
+}
+
+/**
+ * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
+ * @adev: pointer to a ACPI device to get GPIO from
+ * @propname: Property name of the GPIO (optional)
+ * @index: index of GpioIo/GpioInt resource (starting from %0)
+ * @info: info pointer to fill in (optional)
+ *
+ * Function goes through ACPI resources for @adev and based on @index looks
+ * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
+ * and returns it. @index matches GpioIo/GpioInt resources only so if there
+ * are total %3 GPIO resources, the index goes from %0 to %2.
+ *
+ * If @propname is specified the GPIO is looked using device property. In
+ * that case @index is used to select the GPIO entry in the property value
+ * (in case of multiple).
+ *
+ * If the GPIO cannot be translated or there is an error, an ERR_PTR is
+ * returned.
+ *
+ * Note: if the GPIO resource has multiple entries in the pin list, this
+ * function only returns the first.
+ */
+static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
+					  const char *propname, int index,
+					  struct acpi_gpio_info *info)
+{
+	struct acpi_gpio_lookup lookup;
+	int ret;
+
+	if (!adev)
+		return ERR_PTR(-ENODEV);
+
+	memset(&lookup, 0, sizeof(lookup));
+	lookup.index = index;
+
+	if (propname) {
+		dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
+
+		ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
+						propname, index, &lookup);
+		if (ret)
+			return ERR_PTR(ret);
+
+		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
+			dev_name(&lookup.info.adev->dev), lookup.index,
+			lookup.pin_index, lookup.active_low);
+	} else {
+		dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
+		lookup.info.adev = adev;
+	}
+
+	ret = acpi_gpio_resource_lookup(&lookup, info);
+	return ret ? ERR_PTR(ret) : lookup.desc;
+}
+
+static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
+				     const char *con_id)
+{
+	/* Never allow fallback if the device has properties */
+	if (acpi_dev_has_props(adev) || adev->driver_gpios)
+		return false;
+
+	return con_id == NULL;
+}
+
+struct gpio_desc *acpi_find_gpio(struct device *dev,
+				 const char *con_id,
+				 unsigned int idx,
+				 enum gpiod_flags *dflags,
+				 unsigned long *lookupflags)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	struct acpi_gpio_info info;
+	struct gpio_desc *desc;
+	char propname[32];
+	int i;
+
+	/* Try first from _DSD */
+	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
+		if (con_id) {
+			snprintf(propname, sizeof(propname), "%s-%s",
+				 con_id, gpio_suffixes[i]);
+		} else {
+			snprintf(propname, sizeof(propname), "%s",
+				 gpio_suffixes[i]);
+		}
+
+		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
+		if (!IS_ERR(desc))
+			break;
+		if (PTR_ERR(desc) == -EPROBE_DEFER)
+			return ERR_CAST(desc);
+	}
+
+	/* Then from plain _CRS GPIOs */
+	if (IS_ERR(desc)) {
+		if (!acpi_can_fallback_to_crs(adev, con_id))
+			return ERR_PTR(-ENOENT);
+
+		desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
+		if (IS_ERR(desc))
+			return desc;
+	}
+
+	if (info.gpioint &&
+	    (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
+		dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
+		return ERR_PTR(-ENOENT);
+	}
+
+	acpi_gpio_update_gpiod_flags(dflags, &info);
+	acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
+	return desc;
+}
+
+/**
+ * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
+ * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
+ * @propname: Property name of the GPIO
+ * @index: index of GpioIo/GpioInt resource (starting from %0)
+ * @info: info pointer to fill in (optional)
+ *
+ * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
+ * Otherwise (i.e. it is a data-only non-device object), use the property-based
+ * GPIO lookup to get to the GPIO resource with the relevant information and use
+ * that to obtain the GPIO descriptor to return.
+ *
+ * If the GPIO cannot be translated or there is an error an ERR_PTR is
+ * returned.
+ */
+struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
+				      const char *propname, int index,
+				      struct acpi_gpio_info *info)
+{
+	struct acpi_gpio_lookup lookup;
+	struct acpi_device *adev;
+	int ret;
+
+	adev = to_acpi_device_node(fwnode);
+	if (adev)
+		return acpi_get_gpiod_by_index(adev, propname, index, info);
+
+	if (!is_acpi_data_node(fwnode))
+		return ERR_PTR(-ENODEV);
+
+	if (!propname)
+		return ERR_PTR(-EINVAL);
+
+	memset(&lookup, 0, sizeof(lookup));
+	lookup.index = index;
+
+	ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = acpi_gpio_resource_lookup(&lookup, info);
+	return ret ? ERR_PTR(ret) : lookup.desc;
+}
+
+/**
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * @adev: pointer to a ACPI device to get IRQ from
+ * @name: optional name of GpioInt resource
+ * @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to true if the IRQ is wake capable
+ *
+ * If the device has one or more GpioInt resources, this function can be
+ * used to translate from the GPIO offset in the resource to the Linux IRQ
+ * number.
+ *
+ * The function is idempotent, though each time it runs it will configure GPIO
+ * pin direction according to the flags in GpioInt resource.
+ *
+ * The function takes optional @name parameter. If the resource has a property
+ * name, then only those will be taken into account.
+ *
+ * The GPIO is considered wake capable if the GpioInt resource specifies
+ * SharedAndWake or ExclusiveAndWake.
+ *
+ * Return: Linux IRQ number (> %0) on success, negative errno on failure.
+ */
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+				  bool *wake_capable)
+{
+	int idx, i;
+	unsigned int irq_flags;
+	int ret;
+
+	for (i = 0, idx = 0; idx <= index; i++) {
+		struct acpi_gpio_info info;
+		struct gpio_desc *desc;
+
+		desc = acpi_get_gpiod_by_index(adev, name, i, &info);
+
+		/* Ignore -EPROBE_DEFER, it only matters if idx matches */
+		if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
+			return PTR_ERR(desc);
+
+		if (info.gpioint && idx++ == index) {
+			unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
+			enum gpiod_flags dflags = GPIOD_ASIS;
+			char label[32];
+			int irq;
+
+			if (IS_ERR(desc))
+				return PTR_ERR(desc);
+
+			irq = gpiod_to_irq(desc);
+			if (irq < 0)
+				return irq;
+
+			acpi_gpio_update_gpiod_flags(&dflags, &info);
+			acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
+
+			snprintf(label, sizeof(label), "GpioInt() %d", index);
+			ret = gpiod_configure_flags(desc, label, lflags, dflags);
+			if (ret < 0)
+				return ret;
+
+			/* ACPI uses hundredths of milliseconds units */
+			ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
+			if (ret)
+				return ret;
+
+			irq_flags = acpi_dev_get_irq_type(info.triggering,
+							  info.polarity);
+
+			/*
+			 * If the IRQ is not already in use then set type
+			 * if specified and different than the current one.
+			 */
+			if (can_request_irq(irq, irq_flags)) {
+				if (irq_flags != IRQ_TYPE_NONE &&
+				    irq_flags != irq_get_trigger_type(irq))
+					irq_set_irq_type(irq, irq_flags);
+			} else {
+				dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
+			}
+
+			/* avoid suspend issues with GPIOs when systems are using S3 */
+			if (wake_capable && acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
+				*wake_capable = info.wake_capable;
+
+			return irq;
+		}
+
+	}
+	return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
+
+static acpi_status
+acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
+			    u32 bits, u64 *value, void *handler_context,
+			    void *region_context)
+{
+	struct acpi_gpio_chip *achip = region_context;
+	struct gpio_chip *chip = achip->chip;
+	struct acpi_resource_gpio *agpio;
+	struct acpi_resource *ares;
+	u16 pin_index = address;
+	acpi_status status;
+	int length;
+	int i;
+
+	status = acpi_buffer_to_resource(achip->conn_info.connection,
+					 achip->conn_info.length, &ares);
+	if (ACPI_FAILURE(status))
+		return status;
+
+	if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
+		ACPI_FREE(ares);
+		return AE_BAD_PARAMETER;
+	}
+
+	agpio = &ares->data.gpio;
+
+	if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
+	    function == ACPI_WRITE)) {
+		ACPI_FREE(ares);
+		return AE_BAD_PARAMETER;
+	}
+
+	length = min_t(u16, agpio->pin_table_length, pin_index + bits);
+	for (i = pin_index; i < length; ++i) {
+		unsigned int pin = agpio->pin_table[i];
+		struct acpi_gpio_connection *conn;
+		struct gpio_desc *desc;
+		bool found;
+
+		mutex_lock(&achip->conn_lock);
+
+		found = false;
+		list_for_each_entry(conn, &achip->conns, node) {
+			if (conn->pin == pin) {
+				found = true;
+				desc = conn->desc;
+				break;
+			}
+		}
+
+		/*
+		 * The same GPIO can be shared between operation region and
+		 * event but only if the access here is ACPI_READ. In that
+		 * case we "borrow" the event GPIO instead.
+		 */
+		if (!found && agpio->shareable == ACPI_SHARED &&
+		     function == ACPI_READ) {
+			struct acpi_gpio_event *event;
+
+			list_for_each_entry(event, &achip->events, node) {
+				if (event->pin == pin) {
+					desc = event->desc;
+					found = true;
+					break;
+				}
+			}
+		}
+
+		if (!found) {
+			desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
+			if (IS_ERR(desc)) {
+				mutex_unlock(&achip->conn_lock);
+				status = AE_ERROR;
+				goto out;
+			}
+
+			conn = kzalloc(sizeof(*conn), GFP_KERNEL);
+			if (!conn) {
+				gpiochip_free_own_desc(desc);
+				mutex_unlock(&achip->conn_lock);
+				status = AE_NO_MEMORY;
+				goto out;
+			}
+
+			conn->pin = pin;
+			conn->desc = desc;
+			list_add_tail(&conn->node, &achip->conns);
+		}
+
+		mutex_unlock(&achip->conn_lock);
+
+		if (function == ACPI_WRITE)
+			gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
+		else
+			*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
+	}
+
+out:
+	ACPI_FREE(ares);
+	return status;
+}
+
+static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
+{
+	struct gpio_chip *chip = achip->chip;
+	acpi_handle handle = ACPI_HANDLE(chip->parent);
+	acpi_status status;
+
+	INIT_LIST_HEAD(&achip->conns);
+	mutex_init(&achip->conn_lock);
+	status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
+						    acpi_gpio_adr_space_handler,
+						    NULL, achip);
+	if (ACPI_FAILURE(status))
+		dev_err(chip->parent,
+		        "Failed to install GPIO OpRegion handler\n");
+}
+
+static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
+{
+	struct gpio_chip *chip = achip->chip;
+	acpi_handle handle = ACPI_HANDLE(chip->parent);
+	struct acpi_gpio_connection *conn, *tmp;
+	acpi_status status;
+
+	status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
+						   acpi_gpio_adr_space_handler);
+	if (ACPI_FAILURE(status)) {
+		dev_err(chip->parent,
+			"Failed to remove GPIO OpRegion handler\n");
+		return;
+	}
+
+	list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
+		gpiochip_free_own_desc(conn->desc);
+		list_del(&conn->node);
+		kfree(conn);
+	}
+}
+
+static struct gpio_desc *
+acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
+			     struct fwnode_handle *fwnode,
+			     const char **name,
+			     unsigned long *lflags,
+			     enum gpiod_flags *dflags)
+{
+	struct gpio_chip *chip = achip->chip;
+	struct gpio_desc *desc;
+	u32 gpios[2];
+	int ret;
+
+	*lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
+	*dflags = GPIOD_ASIS;
+	*name = NULL;
+
+	ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
+					     ARRAY_SIZE(gpios));
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	desc = gpiochip_get_desc(chip, gpios[0]);
+	if (IS_ERR(desc))
+		return desc;
+
+	if (gpios[1])
+		*lflags |= GPIO_ACTIVE_LOW;
+
+	if (fwnode_property_present(fwnode, "input"))
+		*dflags |= GPIOD_IN;
+	else if (fwnode_property_present(fwnode, "output-low"))
+		*dflags |= GPIOD_OUT_LOW;
+	else if (fwnode_property_present(fwnode, "output-high"))
+		*dflags |= GPIOD_OUT_HIGH;
+	else
+		return ERR_PTR(-EINVAL);
+
+	fwnode_property_read_string(fwnode, "line-name", name);
+
+	return desc;
+}
+
+static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
+{
+	struct gpio_chip *chip = achip->chip;
+	struct fwnode_handle *fwnode;
+
+	device_for_each_child_node(chip->parent, fwnode) {
+		unsigned long lflags;
+		enum gpiod_flags dflags;
+		struct gpio_desc *desc;
+		const char *name;
+		int ret;
+
+		if (!fwnode_property_present(fwnode, "gpio-hog"))
+			continue;
+
+		desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
+						    &lflags, &dflags);
+		if (IS_ERR(desc))
+			continue;
+
+		ret = gpiod_hog(desc, name, lflags, dflags);
+		if (ret) {
+			dev_err(chip->parent, "Failed to hog GPIO\n");
+			fwnode_handle_put(fwnode);
+			return;
+		}
+	}
+}
+
+void acpi_gpiochip_add(struct gpio_chip *chip)
+{
+	struct acpi_gpio_chip *acpi_gpio;
+	struct acpi_device *adev;
+	acpi_status status;
+
+	if (!chip || !chip->parent)
+		return;
+
+	adev = ACPI_COMPANION(chip->parent);
+	if (!adev)
+		return;
+
+	acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
+	if (!acpi_gpio) {
+		dev_err(chip->parent,
+			"Failed to allocate memory for ACPI GPIO chip\n");
+		return;
+	}
+
+	acpi_gpio->chip = chip;
+	INIT_LIST_HEAD(&acpi_gpio->events);
+	INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
+
+	status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
+	if (ACPI_FAILURE(status)) {
+		dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
+		kfree(acpi_gpio);
+		return;
+	}
+
+	acpi_gpiochip_request_regions(acpi_gpio);
+	acpi_gpiochip_scan_gpios(acpi_gpio);
+	acpi_dev_clear_dependencies(adev);
+}
+
+void acpi_gpiochip_remove(struct gpio_chip *chip)
+{
+	struct acpi_gpio_chip *acpi_gpio;
+	acpi_handle handle;
+	acpi_status status;
+
+	if (!chip || !chip->parent)
+		return;
+
+	handle = ACPI_HANDLE(chip->parent);
+	if (!handle)
+		return;
+
+	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+	if (ACPI_FAILURE(status)) {
+		dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
+		return;
+	}
+
+	acpi_gpiochip_free_regions(acpi_gpio);
+
+	acpi_detach_data(handle, acpi_gpio_chip_dh);
+	kfree(acpi_gpio);
+}
+
+void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
+{
+	/* Set default fwnode to parent's one if present */
+	if (gc->parent)
+		ACPI_COMPANION_SET(&gdev->dev, ACPI_COMPANION(gc->parent));
+
+	if (gc->fwnode)
+		device_set_node(&gdev->dev, gc->fwnode);
+}
+
+static int acpi_gpio_package_count(const union acpi_object *obj)
+{
+	const union acpi_object *element = obj->package.elements;
+	const union acpi_object *end = element + obj->package.count;
+	unsigned int count = 0;
+
+	while (element < end) {
+		switch (element->type) {
+		case ACPI_TYPE_LOCAL_REFERENCE:
+			element += 3;
+			fallthrough;
+		case ACPI_TYPE_INTEGER:
+			element++;
+			count++;
+			break;
+
+		default:
+			return -EPROTO;
+		}
+	}
+
+	return count;
+}
+
+static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
+{
+	unsigned int *count = data;
+
+	if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
+		*count += ares->data.gpio.pin_table_length;
+
+	return 1;
+}
+
+/**
+ * acpi_gpio_count - count the GPIOs associated with a device / function
+ * @dev:	GPIO consumer, can be %NULL for system-global GPIOs
+ * @con_id:	function within the GPIO consumer
+ *
+ * Return:
+ * The number of GPIOs associated with a device / function or %-ENOENT,
+ * if no GPIO has been assigned to the requested function.
+ */
+int acpi_gpio_count(struct device *dev, const char *con_id)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	const union acpi_object *obj;
+	const struct acpi_gpio_mapping *gm;
+	int count = -ENOENT;
+	int ret;
+	char propname[32];
+	unsigned int i;
+
+	/* Try first from _DSD */
+	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
+		if (con_id)
+			snprintf(propname, sizeof(propname), "%s-%s",
+				 con_id, gpio_suffixes[i]);
+		else
+			snprintf(propname, sizeof(propname), "%s",
+				 gpio_suffixes[i]);
+
+		ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
+					    &obj);
+		if (ret == 0) {
+			if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
+				count = 1;
+			else if (obj->type == ACPI_TYPE_PACKAGE)
+				count = acpi_gpio_package_count(obj);
+		} else if (adev->driver_gpios) {
+			for (gm = adev->driver_gpios; gm->name; gm++)
+				if (strcmp(propname, gm->name) == 0) {
+					count = gm->size;
+					break;
+				}
+		}
+		if (count > 0)
+			break;
+	}
+
+	/* Then from plain _CRS GPIOs */
+	if (count < 0) {
+		struct list_head resource_list;
+		unsigned int crs_count = 0;
+
+		if (!acpi_can_fallback_to_crs(adev, con_id))
+			return count;
+
+		INIT_LIST_HEAD(&resource_list);
+		acpi_dev_get_resources(adev, &resource_list,
+				       acpi_find_gpio_count, &crs_count);
+		acpi_dev_free_resource_list(&resource_list);
+		if (crs_count > 0)
+			count = crs_count;
+	}
+	return count ? count : -ENOENT;
+}
+
+/* Run deferred acpi_gpiochip_request_irqs() */
+static int __init acpi_gpio_handle_deferred_request_irqs(void)
+{
+	struct acpi_gpio_chip *acpi_gpio, *tmp;
+
+	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+	list_for_each_entry_safe(acpi_gpio, tmp,
+				 &acpi_gpio_deferred_req_irqs_list,
+				 deferred_req_irqs_list_entry)
+		acpi_gpiochip_request_irqs(acpi_gpio);
+
+	acpi_gpio_deferred_req_irqs_done = true;
+	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+
+	return 0;
+}
+/* We must use _sync so that this runs after the first deferred_probe run */
+late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
+
+static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
+	{
+		/*
+		 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
+		 * a non existing micro-USB-B connector which puts the HDMI
+		 * DDC pins in GPIO mode, breaking HDMI support.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.no_edge_events_on_boot = true,
+		},
+	},
+	{
+		/*
+		 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
+		 * instead of controlling the actual micro-USB-B turns the 5V
+		 * boost for its USB-A connector off. The actual micro-USB-B
+		 * connector is wired for charging only.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.no_edge_events_on_boot = true,
+		},
+	},
+	{
+		/*
+		 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
+		 * external embedded-controller connected via I2C + an ACPI GPIO
+		 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "INT33FC:02@12",
+		},
+	},
+	{
+		/*
+		 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
+		 * external embedded-controller connected via I2C + an ACPI GPIO
+		 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
+		 * When suspending by closing the LID, the power to the USB
+		 * keyboard is turned off, causing INT0002 ACPI events to
+		 * trigger once the XHCI controller notices the keyboard is
+		 * gone. So INT0002 events cause spurious wakeups too. Ignoring
+		 * EC wakes breaks wakeup when opening the lid, the user needs
+		 * to press the power-button to wakeup the system. The
+		 * alternative is suspend simply not working, which is worse.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "INT33FF:01@0,INT0002:00@2",
+		},
+	},
+	{
+		/*
+		 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
+		 * external embedded-controller connected via I2C + an ACPI GPIO
+		 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
+			DMI_MATCH(DMI_BOARD_NAME, "815D"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "INT33FC:02@28",
+		},
+	},
+	{
+		/*
+		 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
+		 * external embedded-controller connected via I2C + an ACPI GPIO
+		 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
+			DMI_MATCH(DMI_BOARD_NAME, "813E"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "INT33FF:01@0",
+		},
+	},
+	{
+		/*
+		 * Interrupt storm caused from edge triggered floating pin
+		 * Found in BIOS UX325UAZ.300
+		 * https://bugzilla.kernel.org/show_bug.cgi?id=216208
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_interrupt = "AMDI0030:00@18",
+		},
+	},
+	{
+		/*
+		 * Spurious wakeups from TP_ATTN# pin
+		 * Found in BIOS 1.7.8
+		 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
+		 */
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "ELAN0415:00@9",
+		},
+	},
+	{
+		/*
+		 * Spurious wakeups from TP_ATTN# pin
+		 * Found in BIOS 1.7.8
+		 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
+		 */
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "ELAN0415:00@9",
+		},
+	},
+	{
+		/*
+		 * Spurious wakeups from TP_ATTN# pin
+		 * Found in BIOS 0.35
+		 * https://gitlab.freedesktop.org/drm/amd/-/issues/3073
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "G1619-04"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore_wake = "PNP0C50:00@8",
+		},
+	},
+	{} /* Terminating entry */
+};
+
+static int __init acpi_gpio_setup_params(void)
+{
+	const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
+	const struct dmi_system_id *id;
+
+	id = dmi_first_match(gpiolib_acpi_quirks);
+	if (id)
+		quirk = id->driver_data;
+
+	if (run_edge_events_on_boot < 0) {
+		if (quirk && quirk->no_edge_events_on_boot)
+			run_edge_events_on_boot = 0;
+		else
+			run_edge_events_on_boot = 1;
+	}
+
+	if (ignore_wake == NULL && quirk && quirk->ignore_wake)
+		ignore_wake = quirk->ignore_wake;
+
+	if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
+		ignore_interrupt = quirk->ignore_interrupt;
+
+	return 0;
+}
+
+/* Directly after dmi_setup() which runs as core_initcall() */
+postcore_initcall(acpi_gpio_setup_params);