1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI helpers for GPIO API
5 * Copyright (C) 2012, Intel Corporation
10 #include <linux/acpi.h>
11 #include <linux/dmi.h>
12 #include <linux/errno.h>
13 #include <linux/export.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/mutex.h>
17 #include <linux/pinctrl/pinctrl.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/gpio/driver.h>
21 #include <linux/gpio/machine.h>
24 #include "gpiolib-acpi.h"
26 static int run_edge_events_on_boot = -1;
27 module_param(run_edge_events_on_boot, int, 0444);
28 MODULE_PARM_DESC(run_edge_events_on_boot,
29 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
31 static char *ignore_wake;
32 module_param(ignore_wake, charp, 0444);
33 MODULE_PARM_DESC(ignore_wake,
34 "controller@pin combos on which to ignore the ACPI wake flag "
35 "ignore_wake=controller@pin[,controller@pin[,...]]");
37 static char *ignore_interrupt;
38 module_param(ignore_interrupt, charp, 0444);
39 MODULE_PARM_DESC(ignore_interrupt,
40 "controller@pin combos on which to ignore interrupt "
41 "ignore_interrupt=controller@pin[,controller@pin[,...]]");
43 struct acpi_gpiolib_dmi_quirk {
44 bool no_edge_events_on_boot;
46 char *ignore_interrupt;
50 * struct acpi_gpio_event - ACPI GPIO event handler data
52 * @node: list-entry of the events list of the struct acpi_gpio_chip
53 * @handle: handle of ACPI method to execute when the IRQ triggers
54 * @handler: handler function to pass to request_irq() when requesting the IRQ
55 * @pin: GPIO pin number on the struct gpio_chip
56 * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
57 * @irqflags: flags to pass to request_irq() when requesting the IRQ
58 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
59 * @irq_requested:True if request_irq() has been done
60 * @desc: struct gpio_desc for the GPIO pin for this event
62 struct acpi_gpio_event {
63 struct list_head node;
65 irq_handler_t handler;
68 unsigned long irqflags;
71 struct gpio_desc *desc;
74 struct acpi_gpio_connection {
75 struct list_head node;
77 struct gpio_desc *desc;
80 struct acpi_gpio_chip {
82 * ACPICA requires that the first field of the context parameter
83 * passed to acpi_install_address_space_handler() is large enough
84 * to hold struct acpi_connection_info.
86 struct acpi_connection_info conn_info;
87 struct list_head conns;
88 struct mutex conn_lock;
89 struct gpio_chip *chip;
90 struct list_head events;
91 struct list_head deferred_req_irqs_list_entry;
95 * struct acpi_gpio_info - ACPI GPIO specific information
96 * @adev: reference to ACPI device which consumes GPIO resource
97 * @flags: GPIO initialization flags
98 * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
99 * @pin_config: pin bias as provided by ACPI
100 * @polarity: interrupt polarity as provided by ACPI
101 * @triggering: triggering type as provided by ACPI
102 * @wake_capable: wake capability as provided by ACPI
103 * @debounce: debounce timeout as provided by ACPI
104 * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
106 struct acpi_gpio_info {
107 struct acpi_device *adev;
108 enum gpiod_flags flags;
114 unsigned int debounce;
119 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
120 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
121 * late_initcall_sync() handler, so that other builtin drivers can register their
122 * OpRegions before the event handlers can run. This list contains GPIO chips
123 * for which the acpi_gpiochip_request_irqs() call has been deferred.
125 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
126 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
127 static bool acpi_gpio_deferred_req_irqs_done;
129 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
131 return device_match_acpi_handle(&gc->gpiodev->dev, data);
135 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
136 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
137 * @pin: ACPI GPIO pin number (0-based, controller-relative)
139 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
140 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
141 * controller does not have GPIO chip registered at the moment. This is to
142 * support probe deferral.
144 static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
149 status = acpi_get_handle(NULL, path, &handle);
150 if (ACPI_FAILURE(status))
151 return ERR_PTR(-ENODEV);
153 struct gpio_device *gdev __free(gpio_device_put) =
154 gpio_device_find(handle, acpi_gpiochip_find);
156 return ERR_PTR(-EPROBE_DEFER);
159 * FIXME: keep track of the reference to the GPIO device somehow
160 * instead of putting it here.
162 return gpio_device_get_desc(gdev, pin);
165 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
167 struct acpi_gpio_event *event = data;
169 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
174 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
176 struct acpi_gpio_event *event = data;
178 acpi_execute_simple_method(event->handle, NULL, event->pin);
183 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
185 /* The address of this function is used as a key. */
188 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
189 struct acpi_resource_gpio **agpio)
191 struct acpi_resource_gpio *gpio;
193 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
196 gpio = &ares->data.gpio;
197 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
203 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
206 * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
207 * I/O resource or return False if not.
208 * @ares: Pointer to the ACPI resource to fetch
209 * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
211 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
212 struct acpi_resource_gpio **agpio)
214 struct acpi_resource_gpio *gpio;
216 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
219 gpio = &ares->data.gpio;
220 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
226 EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
228 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
229 struct acpi_gpio_event *event)
231 struct device *parent = acpi_gpio->chip->parent;
234 ret = request_threaded_irq(event->irq, NULL, event->handler,
235 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
237 dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
241 if (event->irq_is_wake)
242 enable_irq_wake(event->irq);
244 event->irq_requested = true;
246 /* Make sure we trigger the initial state of edge-triggered IRQs */
247 if (run_edge_events_on_boot &&
248 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
249 value = gpiod_get_raw_value_cansleep(event->desc);
250 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
251 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
252 event->handler(event->irq, event);
256 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
258 struct acpi_gpio_event *event;
260 list_for_each_entry(event, &acpi_gpio->events, node)
261 acpi_gpiochip_request_irq(acpi_gpio, event);
264 static enum gpiod_flags
265 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
267 /* GpioInt() implies input configuration */
268 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
271 switch (agpio->io_restriction) {
272 case ACPI_IO_RESTRICT_INPUT:
274 case ACPI_IO_RESTRICT_OUTPUT:
276 * ACPI GPIO resources don't contain an initial value for the
277 * GPIO. Therefore we deduce that value from the pull field
278 * and the polarity instead. If the pin is pulled up we assume
279 * default to be high, if it is pulled down we assume default
280 * to be low, otherwise we leave pin untouched. For active low
281 * polarity values will be switched. See also
282 * Documentation/firmware-guide/acpi/gpio-properties.rst.
284 switch (agpio->pin_config) {
285 case ACPI_PIN_CONFIG_PULLUP:
286 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
287 case ACPI_PIN_CONFIG_PULLDOWN:
288 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
298 * Assume that the BIOS has configured the direction and pull
304 static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
305 struct acpi_resource_gpio *agpio,
309 int polarity = GPIO_ACTIVE_HIGH;
310 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
311 unsigned int pin = agpio->pin_table[index];
312 struct gpio_desc *desc;
315 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
319 /* ACPI uses hundredths of milliseconds units */
320 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
322 dev_warn(chip->parent,
323 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
329 static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
332 const char *controller, *pin_str;
337 controller = ignore_list;
339 pin_str = strchr(controller, '@');
343 len = pin_str - controller;
344 if (len == strlen(controller_in) &&
345 strncmp(controller, controller_in, len) == 0) {
346 pin = simple_strtoul(pin_str + 1, &endp, 10);
347 if (*endp != 0 && *endp != ',')
354 controller = strchr(controller, ',');
361 pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
365 static bool acpi_gpio_irq_is_wake(struct device *parent,
366 const struct acpi_resource_gpio *agpio)
368 unsigned int pin = agpio->pin_table[0];
370 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
373 if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
374 dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
381 /* Always returns AE_OK so that we keep looping over the resources */
382 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
385 struct acpi_gpio_chip *acpi_gpio = context;
386 struct gpio_chip *chip = acpi_gpio->chip;
387 struct acpi_resource_gpio *agpio;
388 acpi_handle handle, evt_handle;
389 struct acpi_gpio_event *event;
390 irq_handler_t handler = NULL;
391 struct gpio_desc *desc;
395 if (!acpi_gpio_get_irq_resource(ares, &agpio))
398 handle = ACPI_HANDLE(chip->parent);
399 pin = agpio->pin_table[0];
403 sprintf(ev_name, "_%c%02X",
404 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
406 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
407 handler = acpi_gpio_irq_handler;
410 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
411 handler = acpi_gpio_irq_handler_evt;
416 if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
417 dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
421 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
423 dev_err(chip->parent,
424 "Failed to request GPIO for pin 0x%04X, err %ld\n",
429 ret = gpiochip_lock_as_irq(chip, pin);
431 dev_err(chip->parent,
432 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
437 irq = gpiod_to_irq(desc);
439 dev_err(chip->parent,
440 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
442 goto fail_unlock_irq;
445 event = kzalloc(sizeof(*event), GFP_KERNEL);
447 goto fail_unlock_irq;
449 event->irqflags = IRQF_ONESHOT;
450 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
451 if (agpio->polarity == ACPI_ACTIVE_HIGH)
452 event->irqflags |= IRQF_TRIGGER_HIGH;
454 event->irqflags |= IRQF_TRIGGER_LOW;
456 switch (agpio->polarity) {
457 case ACPI_ACTIVE_HIGH:
458 event->irqflags |= IRQF_TRIGGER_RISING;
460 case ACPI_ACTIVE_LOW:
461 event->irqflags |= IRQF_TRIGGER_FALLING;
464 event->irqflags |= IRQF_TRIGGER_RISING |
465 IRQF_TRIGGER_FALLING;
470 event->handle = evt_handle;
471 event->handler = handler;
473 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
477 list_add_tail(&event->node, &acpi_gpio->events);
482 gpiochip_unlock_as_irq(chip, pin);
484 gpiochip_free_own_desc(desc);
490 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
493 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
494 * handled by ACPI event methods which need to be called from the GPIO
495 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
496 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
497 * the ACPI event methods for those pins.
499 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
501 struct acpi_gpio_chip *acpi_gpio;
506 if (!chip->parent || !chip->to_irq)
509 handle = ACPI_HANDLE(chip->parent);
513 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
514 if (ACPI_FAILURE(status))
517 if (acpi_quirk_skip_gpio_event_handlers())
520 acpi_walk_resources(handle, METHOD_NAME__AEI,
521 acpi_gpiochip_alloc_event, acpi_gpio);
523 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
524 defer = !acpi_gpio_deferred_req_irqs_done;
526 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
527 &acpi_gpio_deferred_req_irqs_list);
528 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
533 acpi_gpiochip_request_irqs(acpi_gpio);
535 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
538 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
541 * Free interrupts associated with GPIO ACPI event method for the given
544 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
546 struct acpi_gpio_chip *acpi_gpio;
547 struct acpi_gpio_event *event, *ep;
551 if (!chip->parent || !chip->to_irq)
554 handle = ACPI_HANDLE(chip->parent);
558 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
559 if (ACPI_FAILURE(status))
562 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
563 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
564 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
565 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
567 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
568 if (event->irq_requested) {
569 if (event->irq_is_wake)
570 disable_irq_wake(event->irq);
572 free_irq(event->irq, event);
575 gpiochip_unlock_as_irq(chip, event->pin);
576 gpiochip_free_own_desc(event->desc);
577 list_del(&event->node);
581 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
583 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
584 const struct acpi_gpio_mapping *gpios)
587 adev->driver_gpios = gpios;
592 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
594 void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
597 adev->driver_gpios = NULL;
599 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
601 static void acpi_dev_release_driver_gpios(void *adev)
603 acpi_dev_remove_driver_gpios(adev);
606 int devm_acpi_dev_add_driver_gpios(struct device *dev,
607 const struct acpi_gpio_mapping *gpios)
609 struct acpi_device *adev = ACPI_COMPANION(dev);
612 ret = acpi_dev_add_driver_gpios(adev, gpios);
616 return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
618 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
620 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
621 const char *name, int index,
622 struct fwnode_reference_args *args,
623 unsigned int *quirks)
625 const struct acpi_gpio_mapping *gm;
627 if (!adev || !adev->driver_gpios)
630 for (gm = adev->driver_gpios; gm->name; gm++)
631 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
632 const struct acpi_gpio_params *par = gm->data + index;
634 args->fwnode = acpi_fwnode_handle(adev);
635 args->args[0] = par->crs_entry_index;
636 args->args[1] = par->line_index;
637 args->args[2] = par->active_low;
640 *quirks = gm->quirks;
648 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
650 const enum gpiod_flags mask =
651 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
652 GPIOD_FLAGS_BIT_DIR_VAL;
656 * Check if the BIOS has IoRestriction with explicitly set direction
657 * and update @flags accordingly. Otherwise use whatever caller asked
660 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
661 enum gpiod_flags diff = *flags ^ update;
664 * Check if caller supplied incompatible GPIO initialization
667 * Return %-EINVAL to notify that firmware has different
668 * settings and we are going to use them.
670 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
671 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
673 *flags = (*flags & ~mask) | (update & mask);
678 static int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
679 struct acpi_gpio_info *info)
681 struct device *dev = &info->adev->dev;
682 enum gpiod_flags old = *flags;
685 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
686 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
688 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
691 dev_dbg(dev, "Override GPIO initialization flags\n");
698 static int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
699 struct acpi_gpio_info *info)
701 switch (info->pin_config) {
702 case ACPI_PIN_CONFIG_PULLUP:
703 *lookupflags |= GPIO_PULL_UP;
705 case ACPI_PIN_CONFIG_PULLDOWN:
706 *lookupflags |= GPIO_PULL_DOWN;
708 case ACPI_PIN_CONFIG_NOPULL:
709 *lookupflags |= GPIO_PULL_DISABLE;
715 if (info->polarity == GPIO_ACTIVE_LOW)
716 *lookupflags |= GPIO_ACTIVE_LOW;
721 struct acpi_gpio_lookup {
722 struct acpi_gpio_info info;
726 struct gpio_desc *desc;
730 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
732 struct acpi_gpio_lookup *lookup = data;
734 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
738 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
739 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
740 struct gpio_desc *desc;
743 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
746 if (lookup->n++ != lookup->index)
749 pin_index = lookup->pin_index;
750 if (pin_index >= agpio->pin_table_length)
753 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
754 desc = gpio_to_desc(agpio->pin_table[pin_index]);
756 desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
757 agpio->pin_table[pin_index]);
759 lookup->info.pin_config = agpio->pin_config;
760 lookup->info.debounce = agpio->debounce_timeout;
761 lookup->info.gpioint = gpioint;
762 lookup->info.wake_capable = acpi_gpio_irq_is_wake(&lookup->info.adev->dev, agpio);
765 * Polarity and triggering are only specified for GpioInt
767 * Note: we expect here:
768 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
769 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
771 if (lookup->info.gpioint) {
772 lookup->info.polarity = agpio->polarity;
773 lookup->info.triggering = agpio->triggering;
775 lookup->info.polarity = lookup->active_low;
778 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
784 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
785 struct acpi_gpio_info *info)
787 struct acpi_device *adev = lookup->info.adev;
788 struct list_head res_list;
791 INIT_LIST_HEAD(&res_list);
793 ret = acpi_dev_get_resources(adev, &res_list,
794 acpi_populate_gpio_lookup,
799 acpi_dev_free_resource_list(&res_list);
805 *info = lookup->info;
809 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
810 const char *propname, int index,
811 struct acpi_gpio_lookup *lookup)
813 struct fwnode_reference_args args;
814 unsigned int quirks = 0;
817 memset(&args, 0, sizeof(args));
818 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
821 struct acpi_device *adev;
823 adev = to_acpi_device_node(fwnode);
824 if (!acpi_get_driver_gpio_data(adev, propname, index, &args, &quirks))
828 * The property was found and resolved, so need to lookup the GPIO based
831 if (!to_acpi_device_node(args.fwnode))
836 lookup->index = args.args[0];
837 lookup->pin_index = args.args[1];
838 lookup->active_low = !!args.args[2];
840 lookup->info.adev = to_acpi_device_node(args.fwnode);
841 lookup->info.quirks = quirks;
847 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
848 * @adev: pointer to a ACPI device to get GPIO from
849 * @propname: Property name of the GPIO (optional)
850 * @index: index of GpioIo/GpioInt resource (starting from %0)
851 * @info: info pointer to fill in (optional)
853 * Function goes through ACPI resources for @adev and based on @index looks
854 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
855 * and returns it. @index matches GpioIo/GpioInt resources only so if there
856 * are total %3 GPIO resources, the index goes from %0 to %2.
858 * If @propname is specified the GPIO is looked using device property. In
859 * that case @index is used to select the GPIO entry in the property value
860 * (in case of multiple).
862 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
865 * Note: if the GPIO resource has multiple entries in the pin list, this
866 * function only returns the first.
868 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
869 const char *propname,
871 struct acpi_gpio_info *info)
873 struct acpi_gpio_lookup lookup;
877 return ERR_PTR(-ENODEV);
879 memset(&lookup, 0, sizeof(lookup));
880 lookup.index = index;
883 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
885 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
886 propname, index, &lookup);
890 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
891 dev_name(&lookup.info.adev->dev), lookup.index,
892 lookup.pin_index, lookup.active_low);
894 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
895 lookup.info.adev = adev;
898 ret = acpi_gpio_resource_lookup(&lookup, info);
899 return ret ? ERR_PTR(ret) : lookup.desc;
903 * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node
904 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
905 * @propname: Property name of the GPIO
906 * @index: index of GpioIo/GpioInt resource (starting from %0)
907 * @info: info pointer to fill in (optional)
909 * This function uses the property-based GPIO lookup to get to the GPIO
910 * resource with the relevant information from a data-only ACPI firmware node
911 * and uses that to obtain the GPIO descriptor to return.
913 * If the GPIO cannot be translated or there is an error an ERR_PTR is
916 static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode,
917 const char *propname,
919 struct acpi_gpio_info *info)
921 struct acpi_gpio_lookup lookup;
924 if (!is_acpi_data_node(fwnode))
925 return ERR_PTR(-ENODEV);
928 return ERR_PTR(-EINVAL);
930 memset(&lookup, 0, sizeof(lookup));
931 lookup.index = index;
933 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
937 ret = acpi_gpio_resource_lookup(&lookup, info);
938 return ret ? ERR_PTR(ret) : lookup.desc;
941 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
944 /* Never allow fallback if the device has properties */
945 if (acpi_dev_has_props(adev) || adev->driver_gpios)
948 return con_id == NULL;
951 struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode,
954 enum gpiod_flags *dflags,
955 unsigned long *lookupflags)
957 struct acpi_device *adev = to_acpi_device_node(fwnode);
958 struct acpi_gpio_info info;
959 struct gpio_desc *desc;
963 /* Try first from _DSD */
964 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
966 snprintf(propname, sizeof(propname), "%s-%s",
967 con_id, gpio_suffixes[i]);
969 snprintf(propname, sizeof(propname), "%s",
974 desc = acpi_get_gpiod_by_index(adev,
975 propname, idx, &info);
977 desc = acpi_get_gpiod_from_data(fwnode,
978 propname, idx, &info);
981 if (PTR_ERR(desc) == -EPROBE_DEFER)
982 return ERR_CAST(desc);
985 /* Then from plain _CRS GPIOs */
987 if (!adev || !acpi_can_fallback_to_crs(adev, con_id))
988 return ERR_PTR(-ENOENT);
990 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
996 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
997 dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
998 return ERR_PTR(-ENOENT);
1001 acpi_gpio_update_gpiod_flags(dflags, &info);
1002 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
1007 * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
1008 * @adev: pointer to a ACPI device to get IRQ from
1009 * @name: optional name of GpioInt resource
1010 * @index: index of GpioInt resource (starting from %0)
1011 * @wake_capable: Set to true if the IRQ is wake capable
1013 * If the device has one or more GpioInt resources, this function can be
1014 * used to translate from the GPIO offset in the resource to the Linux IRQ
1017 * The function is idempotent, though each time it runs it will configure GPIO
1018 * pin direction according to the flags in GpioInt resource.
1020 * The function takes optional @name parameter. If the resource has a property
1021 * name, then only those will be taken into account.
1023 * The GPIO is considered wake capable if the GpioInt resource specifies
1024 * SharedAndWake or ExclusiveAndWake.
1026 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
1028 int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
1032 unsigned int irq_flags;
1035 for (i = 0, idx = 0; idx <= index; i++) {
1036 struct acpi_gpio_info info;
1037 struct gpio_desc *desc;
1039 desc = acpi_get_gpiod_by_index(adev, name, i, &info);
1041 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
1042 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
1043 return PTR_ERR(desc);
1045 if (info.gpioint && idx++ == index) {
1046 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1047 enum gpiod_flags dflags = GPIOD_ASIS;
1052 return PTR_ERR(desc);
1054 irq = gpiod_to_irq(desc);
1058 acpi_gpio_update_gpiod_flags(&dflags, &info);
1059 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
1061 snprintf(label, sizeof(label), "GpioInt() %d", index);
1062 ret = gpiod_configure_flags(desc, label, lflags, dflags);
1066 /* ACPI uses hundredths of milliseconds units */
1067 ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
1071 irq_flags = acpi_dev_get_irq_type(info.triggering,
1075 * If the IRQ is not already in use then set type
1076 * if specified and different than the current one.
1078 if (can_request_irq(irq, irq_flags)) {
1079 if (irq_flags != IRQ_TYPE_NONE &&
1080 irq_flags != irq_get_trigger_type(irq))
1081 irq_set_irq_type(irq, irq_flags);
1083 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
1086 /* avoid suspend issues with GPIOs when systems are using S3 */
1087 if (wake_capable && acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
1088 *wake_capable = info.wake_capable;
1096 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
1099 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
1100 u32 bits, u64 *value, void *handler_context,
1101 void *region_context)
1103 struct acpi_gpio_chip *achip = region_context;
1104 struct gpio_chip *chip = achip->chip;
1105 struct acpi_resource_gpio *agpio;
1106 struct acpi_resource *ares;
1107 u16 pin_index = address;
1112 status = acpi_buffer_to_resource(achip->conn_info.connection,
1113 achip->conn_info.length, &ares);
1114 if (ACPI_FAILURE(status))
1117 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
1119 return AE_BAD_PARAMETER;
1122 agpio = &ares->data.gpio;
1124 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
1125 function == ACPI_WRITE)) {
1127 return AE_BAD_PARAMETER;
1130 length = min_t(u16, agpio->pin_table_length, pin_index + bits);
1131 for (i = pin_index; i < length; ++i) {
1132 unsigned int pin = agpio->pin_table[i];
1133 struct acpi_gpio_connection *conn;
1134 struct gpio_desc *desc;
1137 mutex_lock(&achip->conn_lock);
1140 list_for_each_entry(conn, &achip->conns, node) {
1141 if (conn->pin == pin) {
1149 * The same GPIO can be shared between operation region and
1150 * event but only if the access here is ACPI_READ. In that
1151 * case we "borrow" the event GPIO instead.
1153 if (!found && agpio->shareable == ACPI_SHARED &&
1154 function == ACPI_READ) {
1155 struct acpi_gpio_event *event;
1157 list_for_each_entry(event, &achip->events, node) {
1158 if (event->pin == pin) {
1167 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
1169 mutex_unlock(&achip->conn_lock);
1174 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1176 gpiochip_free_own_desc(desc);
1177 mutex_unlock(&achip->conn_lock);
1178 status = AE_NO_MEMORY;
1184 list_add_tail(&conn->node, &achip->conns);
1187 mutex_unlock(&achip->conn_lock);
1189 if (function == ACPI_WRITE)
1190 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
1192 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1200 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1202 struct gpio_chip *chip = achip->chip;
1203 acpi_handle handle = ACPI_HANDLE(chip->parent);
1206 INIT_LIST_HEAD(&achip->conns);
1207 mutex_init(&achip->conn_lock);
1208 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1209 acpi_gpio_adr_space_handler,
1211 if (ACPI_FAILURE(status))
1212 dev_err(chip->parent,
1213 "Failed to install GPIO OpRegion handler\n");
1216 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1218 struct gpio_chip *chip = achip->chip;
1219 acpi_handle handle = ACPI_HANDLE(chip->parent);
1220 struct acpi_gpio_connection *conn, *tmp;
1223 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1224 acpi_gpio_adr_space_handler);
1225 if (ACPI_FAILURE(status)) {
1226 dev_err(chip->parent,
1227 "Failed to remove GPIO OpRegion handler\n");
1231 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1232 gpiochip_free_own_desc(conn->desc);
1233 list_del(&conn->node);
1238 static struct gpio_desc *
1239 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1240 struct fwnode_handle *fwnode,
1242 unsigned long *lflags,
1243 enum gpiod_flags *dflags)
1245 struct gpio_chip *chip = achip->chip;
1246 struct gpio_desc *desc;
1250 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1251 *dflags = GPIOD_ASIS;
1254 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1257 return ERR_PTR(ret);
1259 desc = gpiochip_get_desc(chip, gpios[0]);
1264 *lflags |= GPIO_ACTIVE_LOW;
1266 if (fwnode_property_present(fwnode, "input"))
1267 *dflags |= GPIOD_IN;
1268 else if (fwnode_property_present(fwnode, "output-low"))
1269 *dflags |= GPIOD_OUT_LOW;
1270 else if (fwnode_property_present(fwnode, "output-high"))
1271 *dflags |= GPIOD_OUT_HIGH;
1273 return ERR_PTR(-EINVAL);
1275 fwnode_property_read_string(fwnode, "line-name", name);
1280 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1282 struct gpio_chip *chip = achip->chip;
1283 struct fwnode_handle *fwnode;
1285 device_for_each_child_node(chip->parent, fwnode) {
1286 unsigned long lflags;
1287 enum gpiod_flags dflags;
1288 struct gpio_desc *desc;
1292 if (!fwnode_property_present(fwnode, "gpio-hog"))
1295 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1300 ret = gpiod_hog(desc, name, lflags, dflags);
1302 dev_err(chip->parent, "Failed to hog GPIO\n");
1303 fwnode_handle_put(fwnode);
1309 void acpi_gpiochip_add(struct gpio_chip *chip)
1311 struct acpi_gpio_chip *acpi_gpio;
1312 struct acpi_device *adev;
1315 if (!chip || !chip->parent)
1318 adev = ACPI_COMPANION(chip->parent);
1322 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1324 dev_err(chip->parent,
1325 "Failed to allocate memory for ACPI GPIO chip\n");
1329 acpi_gpio->chip = chip;
1330 INIT_LIST_HEAD(&acpi_gpio->events);
1331 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1333 status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
1334 if (ACPI_FAILURE(status)) {
1335 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1340 acpi_gpiochip_request_regions(acpi_gpio);
1341 acpi_gpiochip_scan_gpios(acpi_gpio);
1342 acpi_dev_clear_dependencies(adev);
1345 void acpi_gpiochip_remove(struct gpio_chip *chip)
1347 struct acpi_gpio_chip *acpi_gpio;
1351 if (!chip || !chip->parent)
1354 handle = ACPI_HANDLE(chip->parent);
1358 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1359 if (ACPI_FAILURE(status)) {
1360 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1364 acpi_gpiochip_free_regions(acpi_gpio);
1366 acpi_detach_data(handle, acpi_gpio_chip_dh);
1370 static int acpi_gpio_package_count(const union acpi_object *obj)
1372 const union acpi_object *element = obj->package.elements;
1373 const union acpi_object *end = element + obj->package.count;
1374 unsigned int count = 0;
1376 while (element < end) {
1377 switch (element->type) {
1378 case ACPI_TYPE_LOCAL_REFERENCE:
1381 case ACPI_TYPE_INTEGER:
1394 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1396 unsigned int *count = data;
1398 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1399 *count += ares->data.gpio.pin_table_length;
1405 * acpi_gpio_count - count the GPIOs associated with a device / function
1406 * @dev: GPIO consumer, can be %NULL for system-global GPIOs
1407 * @con_id: function within the GPIO consumer
1410 * The number of GPIOs associated with a device / function or %-ENOENT,
1411 * if no GPIO has been assigned to the requested function.
1413 int acpi_gpio_count(struct device *dev, const char *con_id)
1415 struct acpi_device *adev = ACPI_COMPANION(dev);
1416 const union acpi_object *obj;
1417 const struct acpi_gpio_mapping *gm;
1418 int count = -ENOENT;
1423 /* Try first from _DSD */
1424 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1426 snprintf(propname, sizeof(propname), "%s-%s",
1427 con_id, gpio_suffixes[i]);
1429 snprintf(propname, sizeof(propname), "%s",
1432 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1435 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1437 else if (obj->type == ACPI_TYPE_PACKAGE)
1438 count = acpi_gpio_package_count(obj);
1439 } else if (adev->driver_gpios) {
1440 for (gm = adev->driver_gpios; gm->name; gm++)
1441 if (strcmp(propname, gm->name) == 0) {
1450 /* Then from plain _CRS GPIOs */
1452 struct list_head resource_list;
1453 unsigned int crs_count = 0;
1455 if (!acpi_can_fallback_to_crs(adev, con_id))
1458 INIT_LIST_HEAD(&resource_list);
1459 acpi_dev_get_resources(adev, &resource_list,
1460 acpi_find_gpio_count, &crs_count);
1461 acpi_dev_free_resource_list(&resource_list);
1465 return count ? count : -ENOENT;
1468 /* Run deferred acpi_gpiochip_request_irqs() */
1469 static int __init acpi_gpio_handle_deferred_request_irqs(void)
1471 struct acpi_gpio_chip *acpi_gpio, *tmp;
1473 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1474 list_for_each_entry_safe(acpi_gpio, tmp,
1475 &acpi_gpio_deferred_req_irqs_list,
1476 deferred_req_irqs_list_entry)
1477 acpi_gpiochip_request_irqs(acpi_gpio);
1479 acpi_gpio_deferred_req_irqs_done = true;
1480 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1484 /* We must use _sync so that this runs after the first deferred_probe run */
1485 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1487 static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
1490 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
1491 * a non existing micro-USB-B connector which puts the HDMI
1492 * DDC pins in GPIO mode, breaking HDMI support.
1495 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1496 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1498 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1499 .no_edge_events_on_boot = true,
1504 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
1505 * instead of controlling the actual micro-USB-B turns the 5V
1506 * boost for its USB-A connector off. The actual micro-USB-B
1507 * connector is wired for charging only.
1510 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
1511 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
1513 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1514 .no_edge_events_on_boot = true,
1519 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
1520 * external embedded-controller connected via I2C + an ACPI GPIO
1521 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
1524 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1525 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
1527 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1528 .ignore_wake = "INT33FC:02@12",
1533 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
1534 * external embedded-controller connected via I2C + an ACPI GPIO
1535 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1536 * When suspending by closing the LID, the power to the USB
1537 * keyboard is turned off, causing INT0002 ACPI events to
1538 * trigger once the XHCI controller notices the keyboard is
1539 * gone. So INT0002 events cause spurious wakeups too. Ignoring
1540 * EC wakes breaks wakeup when opening the lid, the user needs
1541 * to press the power-button to wakeup the system. The
1542 * alternative is suspend simply not working, which is worse.
1545 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1546 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
1548 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1549 .ignore_wake = "INT33FF:01@0,INT0002:00@2",
1554 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
1555 * external embedded-controller connected via I2C + an ACPI GPIO
1556 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
1559 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1560 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1561 DMI_MATCH(DMI_BOARD_NAME, "815D"),
1563 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1564 .ignore_wake = "INT33FC:02@28",
1569 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
1570 * external embedded-controller connected via I2C + an ACPI GPIO
1571 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1574 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1575 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1576 DMI_MATCH(DMI_BOARD_NAME, "813E"),
1578 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1579 .ignore_wake = "INT33FF:01@0",
1584 * Interrupt storm caused from edge triggered floating pin
1585 * Found in BIOS UX325UAZ.300
1586 * https://bugzilla.kernel.org/show_bug.cgi?id=216208
1589 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
1590 DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
1592 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1593 .ignore_interrupt = "AMDI0030:00@18",
1598 * Spurious wakeups from TP_ATTN# pin
1599 * Found in BIOS 1.7.8
1600 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
1603 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
1605 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1606 .ignore_wake = "ELAN0415:00@9",
1611 * Spurious wakeups from TP_ATTN# pin
1612 * Found in BIOS 1.7.8
1613 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
1616 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
1618 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1619 .ignore_wake = "ELAN0415:00@9",
1624 * Spurious wakeups from TP_ATTN# pin
1625 * Found in BIOS 1.7.7
1628 DMI_MATCH(DMI_BOARD_NAME, "NH5xAx"),
1630 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1631 .ignore_wake = "SYNA1202:00@16",
1636 * On the Peaq C1010 2-in-1 INT33FC:00 pin 3 is connected to
1637 * a "dolby" button. At the ACPI level an _AEI event-handler
1638 * is connected which sets an ACPI variable to 1 on both
1639 * edges. This variable can be polled + cleared to 0 using
1640 * WMI. But since the variable is set on both edges the WMI
1641 * interface is pretty useless even when polling.
1642 * So instead the x86-android-tablets code instantiates
1643 * a gpio-keys platform device for it.
1644 * Ignore the _AEI handler for the pin, so that it is not busy.
1647 DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
1648 DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
1650 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1651 .ignore_interrupt = "INT33FC:00@3",
1654 {} /* Terminating entry */
1657 static int __init acpi_gpio_setup_params(void)
1659 const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
1660 const struct dmi_system_id *id;
1662 id = dmi_first_match(gpiolib_acpi_quirks);
1664 quirk = id->driver_data;
1666 if (run_edge_events_on_boot < 0) {
1667 if (quirk && quirk->no_edge_events_on_boot)
1668 run_edge_events_on_boot = 0;
1670 run_edge_events_on_boot = 1;
1673 if (ignore_wake == NULL && quirk && quirk->ignore_wake)
1674 ignore_wake = quirk->ignore_wake;
1676 if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
1677 ignore_interrupt = quirk->ignore_interrupt;
1682 /* Directly after dmi_setup() which runs as core_initcall() */
1683 postcore_initcall(acpi_gpio_setup_params);