2 * ACPI helpers for GPIO API
4 * Copyright (C) 2012, Intel Corporation
5 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
6 * Mika Westerberg <mika.westerberg@linux.intel.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/dmi.h>
14 #include <linux/errno.h>
15 #include <linux/gpio.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/gpio/driver.h>
18 #include <linux/gpio/machine.h>
19 #include <linux/export.h>
20 #include <linux/acpi.h>
21 #include <linux/interrupt.h>
22 #include <linux/mutex.h>
23 #include <linux/pinctrl/pinctrl.h>
27 static int run_edge_events_on_boot = -1;
28 module_param(run_edge_events_on_boot, int, 0444);
29 MODULE_PARM_DESC(run_edge_events_on_boot,
30 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
32 static char *ignore_wake;
33 module_param(ignore_wake, charp, 0444);
34 MODULE_PARM_DESC(ignore_wake,
35 "controller@pin combos on which to ignore the ACPI wake flag "
36 "ignore_wake=controller@pin[,controller@pin[,...]]");
38 struct acpi_gpiolib_dmi_quirk {
39 bool no_edge_events_on_boot;
44 * struct acpi_gpio_event - ACPI GPIO event handler data
46 * @node: list-entry of the events list of the struct acpi_gpio_chip
47 * @handle: handle of ACPI method to execute when the IRQ triggers
48 * @handler: irq_handler to pass to request_irq when requesting the IRQ
49 * @pin: GPIO pin number on the gpio_chip
50 * @irq: Linux IRQ number for the event, for request_ / free_irq
51 * @irqflags: flags to pass to request_irq when requesting the IRQ
52 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
53 * @is_requested: True if request_irq has been done
54 * @desc: gpio_desc for the GPIO pin for this event
56 struct acpi_gpio_event {
57 struct list_head node;
59 irq_handler_t handler;
62 unsigned long irqflags;
65 struct gpio_desc *desc;
68 struct acpi_gpio_connection {
69 struct list_head node;
71 struct gpio_desc *desc;
74 struct acpi_gpio_chip {
76 * ACPICA requires that the first field of the context parameter
77 * passed to acpi_install_address_space_handler() is large enough
78 * to hold struct acpi_connection_info.
80 struct acpi_connection_info conn_info;
81 struct list_head conns;
82 struct mutex conn_lock;
83 struct gpio_chip *chip;
84 struct list_head events;
85 struct list_head deferred_req_irqs_list_entry;
89 * For gpiochips which call acpi_gpiochip_request_interrupts() before late_init
90 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
91 * late_initcall_sync handler, so that other builtin drivers can register their
92 * OpRegions before the event handlers can run. This list contains gpiochips
93 * for which the acpi_gpiochip_request_irqs() call has been deferred.
95 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
96 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
97 static bool acpi_gpio_deferred_req_irqs_done;
99 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
104 return ACPI_HANDLE(gc->parent) == data;
107 #ifdef CONFIG_PINCTRL
109 * acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
111 * @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
113 * Function takes ACPI GpioIo/GpioInt pin number as a parameter and
114 * translates it to a corresponding offset suitable to be passed to a
115 * GPIO controller driver.
117 * Typically the returned offset is same as @pin, but if the GPIO
118 * controller uses pin controller and the mapping is not contiguous the
119 * offset might be different.
121 static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev, int pin)
123 struct gpio_pin_range *pin_range;
125 /* If there are no ranges in this chip, use 1:1 mapping */
126 if (list_empty(&gdev->pin_ranges))
129 list_for_each_entry(pin_range, &gdev->pin_ranges, node) {
130 const struct pinctrl_gpio_range *range = &pin_range->range;
134 for (i = 0; i < range->npins; i++) {
135 if (range->pins[i] == pin)
136 return range->base + i - gdev->base;
139 if (pin >= range->pin_base &&
140 pin < range->pin_base + range->npins) {
143 gpio_base = range->base - gdev->base;
144 return gpio_base + pin - range->pin_base;
152 static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev,
160 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
161 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
162 * @pin: ACPI GPIO pin number (0-based, controller-relative)
164 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
165 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
166 * controller does not have gpiochip registered at the moment. This is to
167 * support probe deferral.
169 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
171 struct gpio_chip *chip;
176 status = acpi_get_handle(NULL, path, &handle);
177 if (ACPI_FAILURE(status))
178 return ERR_PTR(-ENODEV);
180 chip = gpiochip_find(handle, acpi_gpiochip_find);
182 return ERR_PTR(-EPROBE_DEFER);
184 offset = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
186 return ERR_PTR(offset);
188 return gpiochip_get_desc(chip, offset);
191 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
193 struct acpi_gpio_event *event = data;
195 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
200 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
202 struct acpi_gpio_event *event = data;
204 acpi_execute_simple_method(event->handle, NULL, event->pin);
209 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
211 /* The address of this function is used as a key. */
214 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
215 struct acpi_resource_gpio **agpio)
217 struct acpi_resource_gpio *gpio;
219 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
222 gpio = &ares->data.gpio;
223 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
229 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
231 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
232 struct acpi_gpio_event *event)
236 ret = request_threaded_irq(event->irq, NULL, event->handler,
237 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
239 dev_err(acpi_gpio->chip->parent,
240 "Failed to setup interrupt handler for %d\n",
245 if (event->irq_is_wake)
246 enable_irq_wake(event->irq);
248 event->irq_requested = true;
250 /* Make sure we trigger the initial state of edge-triggered IRQs */
251 if (run_edge_events_on_boot &&
252 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
253 value = gpiod_get_raw_value_cansleep(event->desc);
254 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
255 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
256 event->handler(event->irq, event);
260 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
262 struct acpi_gpio_event *event;
264 list_for_each_entry(event, &acpi_gpio->events, node)
265 acpi_gpiochip_request_irq(acpi_gpio, event);
268 static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in)
270 const char *controller, *pin_str;
274 controller = ignore_wake;
276 pin_str = strchr(controller, '@');
280 len = pin_str - controller;
281 if (len == strlen(controller_in) &&
282 strncmp(controller, controller_in, len) == 0) {
283 pin = simple_strtoul(pin_str + 1, &endp, 10);
284 if (*endp != 0 && *endp != ',')
291 controller = strchr(controller, ',');
298 pr_err_once("Error invalid value for gpiolib_acpi.ignore_wake: %s\n",
303 static bool acpi_gpio_irq_is_wake(struct device *parent,
304 struct acpi_resource_gpio *agpio)
306 int pin = agpio->pin_table[0];
308 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
311 if (acpi_gpio_in_ignore_list(dev_name(parent), pin)) {
312 dev_info(parent, "Ignoring wakeup on pin %d\n", pin);
319 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
322 struct acpi_gpio_chip *acpi_gpio = context;
323 struct gpio_chip *chip = acpi_gpio->chip;
324 struct acpi_resource_gpio *agpio;
325 acpi_handle handle, evt_handle;
326 struct acpi_gpio_event *event;
327 irq_handler_t handler = NULL;
328 struct gpio_desc *desc;
331 if (!acpi_gpio_get_irq_resource(ares, &agpio))
334 handle = ACPI_HANDLE(chip->parent);
335 pin = agpio->pin_table[0];
339 sprintf(ev_name, "_%c%02hhX",
340 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
342 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
343 handler = acpi_gpio_irq_handler;
346 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
347 handler = acpi_gpio_irq_handler_evt;
352 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
354 return AE_BAD_PARAMETER;
356 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
358 dev_err(chip->parent, "Failed to request GPIO\n");
362 gpiod_direction_input(desc);
364 ret = gpiochip_lock_as_irq(chip, pin);
366 dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
370 irq = gpiod_to_irq(desc);
372 dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
373 goto fail_unlock_irq;
376 event = kzalloc(sizeof(*event), GFP_KERNEL);
378 goto fail_unlock_irq;
380 event->irqflags = IRQF_ONESHOT;
381 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
382 if (agpio->polarity == ACPI_ACTIVE_HIGH)
383 event->irqflags |= IRQF_TRIGGER_HIGH;
385 event->irqflags |= IRQF_TRIGGER_LOW;
387 switch (agpio->polarity) {
388 case ACPI_ACTIVE_HIGH:
389 event->irqflags |= IRQF_TRIGGER_RISING;
391 case ACPI_ACTIVE_LOW:
392 event->irqflags |= IRQF_TRIGGER_FALLING;
395 event->irqflags |= IRQF_TRIGGER_RISING |
396 IRQF_TRIGGER_FALLING;
401 event->handle = evt_handle;
402 event->handler = handler;
404 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
408 list_add_tail(&event->node, &acpi_gpio->events);
413 gpiochip_unlock_as_irq(chip, pin);
415 gpiochip_free_own_desc(desc);
421 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
424 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
425 * handled by ACPI event methods which need to be called from the GPIO
426 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
427 * gpio pins have acpi event methods and assigns interrupt handlers that calls
428 * the acpi event methods for those pins.
430 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
432 struct acpi_gpio_chip *acpi_gpio;
437 if (!chip->parent || !chip->to_irq)
440 handle = ACPI_HANDLE(chip->parent);
444 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
445 if (ACPI_FAILURE(status))
448 acpi_walk_resources(handle, "_AEI",
449 acpi_gpiochip_alloc_event, acpi_gpio);
451 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
452 defer = !acpi_gpio_deferred_req_irqs_done;
454 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
455 &acpi_gpio_deferred_req_irqs_list);
456 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
461 acpi_gpiochip_request_irqs(acpi_gpio);
463 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
466 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
469 * Free interrupts associated with GPIO ACPI event method for the given
472 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
474 struct acpi_gpio_chip *acpi_gpio;
475 struct acpi_gpio_event *event, *ep;
479 if (!chip->parent || !chip->to_irq)
482 handle = ACPI_HANDLE(chip->parent);
486 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
487 if (ACPI_FAILURE(status))
490 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
491 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
492 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
493 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
495 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
496 struct gpio_desc *desc;
498 if (event->irq_requested) {
499 if (event->irq_is_wake)
500 disable_irq_wake(event->irq);
502 free_irq(event->irq, event);
506 if (WARN_ON(IS_ERR(desc)))
508 gpiochip_unlock_as_irq(chip, event->pin);
509 gpiochip_free_own_desc(desc);
510 list_del(&event->node);
514 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
516 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
517 const struct acpi_gpio_mapping *gpios)
520 adev->driver_gpios = gpios;
525 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
527 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
529 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
532 int devm_acpi_dev_add_driver_gpios(struct device *dev,
533 const struct acpi_gpio_mapping *gpios)
538 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
542 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
547 devres_add(dev, res);
550 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
552 void devm_acpi_dev_remove_driver_gpios(struct device *dev)
554 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
556 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
558 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
559 const char *name, int index,
560 struct acpi_reference_args *args)
562 const struct acpi_gpio_mapping *gm;
564 if (!adev->driver_gpios)
567 for (gm = adev->driver_gpios; gm->name; gm++)
568 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
569 const struct acpi_gpio_params *par = gm->data + index;
572 args->args[0] = par->crs_entry_index;
573 args->args[1] = par->line_index;
574 args->args[2] = par->active_low;
582 static enum gpiod_flags
583 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
585 bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
587 switch (agpio->io_restriction) {
588 case ACPI_IO_RESTRICT_INPUT:
590 case ACPI_IO_RESTRICT_OUTPUT:
592 * ACPI GPIO resources don't contain an initial value for the
593 * GPIO. Therefore we deduce that value from the pull field
594 * instead. If the pin is pulled up we assume default to be
595 * high, otherwise low.
597 return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
600 * Assume that the BIOS has configured the direction and pull
608 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
613 * Check if the BIOS has IoRestriction with explicitly set direction
614 * and update @flags accordingly. Otherwise use whatever caller asked
617 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
618 enum gpiod_flags diff = *flags ^ update;
621 * Check if caller supplied incompatible GPIO initialization
624 * Return %-EINVAL to notify that firmware has different
625 * settings and we are going to use them.
627 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
628 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
635 struct acpi_gpio_lookup {
636 struct acpi_gpio_info info;
640 struct acpi_device *adev;
641 struct gpio_desc *desc;
645 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
647 struct acpi_gpio_lookup *lookup = data;
649 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
652 if (lookup->n++ == lookup->index && !lookup->desc) {
653 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
654 int pin_index = lookup->pin_index;
656 if (pin_index >= agpio->pin_table_length)
659 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
660 agpio->pin_table[pin_index]);
661 lookup->info.gpioint =
662 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
665 * Polarity and triggering are only specified for GpioInt
667 * Note: we expect here:
668 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
669 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
671 if (lookup->info.gpioint) {
672 lookup->info.flags = GPIOD_IN;
673 lookup->info.polarity = agpio->polarity;
674 lookup->info.triggering = agpio->triggering;
676 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
684 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
685 struct acpi_gpio_info *info)
687 struct list_head res_list;
690 INIT_LIST_HEAD(&res_list);
692 ret = acpi_dev_get_resources(lookup->adev, &res_list,
693 acpi_populate_gpio_lookup,
698 acpi_dev_free_resource_list(&res_list);
704 *info = lookup->info;
705 if (lookup->active_low)
706 info->polarity = lookup->active_low;
711 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
712 const char *propname, int index,
713 struct acpi_gpio_lookup *lookup)
715 struct acpi_reference_args args;
718 memset(&args, 0, sizeof(args));
719 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
722 struct acpi_device *adev = to_acpi_device_node(fwnode);
727 if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
731 * The property was found and resolved, so need to lookup the GPIO based
734 lookup->adev = args.adev;
738 lookup->index = args.args[0];
739 lookup->pin_index = args.args[1];
740 lookup->active_low = !!args.args[2];
746 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
747 * @adev: pointer to a ACPI device to get GPIO from
748 * @propname: Property name of the GPIO (optional)
749 * @index: index of GpioIo/GpioInt resource (starting from %0)
750 * @info: info pointer to fill in (optional)
752 * Function goes through ACPI resources for @adev and based on @index looks
753 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
754 * and returns it. @index matches GpioIo/GpioInt resources only so if there
755 * are total %3 GPIO resources, the index goes from %0 to %2.
757 * If @propname is specified the GPIO is looked using device property. In
758 * that case @index is used to select the GPIO entry in the property value
759 * (in case of multiple).
761 * If the GPIO cannot be translated or there is an error an ERR_PTR is
764 * Note: if the GPIO resource has multiple entries in the pin list, this
765 * function only returns the first.
767 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
768 const char *propname, int index,
769 struct acpi_gpio_info *info)
771 struct acpi_gpio_lookup lookup;
775 return ERR_PTR(-ENODEV);
777 memset(&lookup, 0, sizeof(lookup));
778 lookup.index = index;
781 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
783 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
784 propname, index, &lookup);
788 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
789 dev_name(&lookup.adev->dev), lookup.index,
790 lookup.pin_index, lookup.active_low);
792 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
796 ret = acpi_gpio_resource_lookup(&lookup, info);
797 return ret ? ERR_PTR(ret) : lookup.desc;
800 struct gpio_desc *acpi_find_gpio(struct device *dev,
803 enum gpiod_flags *dflags,
804 enum gpio_lookup_flags *lookupflags)
806 struct acpi_device *adev = ACPI_COMPANION(dev);
807 struct acpi_gpio_info info;
808 struct gpio_desc *desc;
813 /* Try first from _DSD */
814 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
816 snprintf(propname, sizeof(propname), "%s-%s",
817 con_id, gpio_suffixes[i]);
819 snprintf(propname, sizeof(propname), "%s",
823 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
826 if (PTR_ERR(desc) == -EPROBE_DEFER)
827 return ERR_CAST(desc);
830 /* Then from plain _CRS GPIOs */
832 if (!acpi_can_fallback_to_crs(adev, con_id))
833 return ERR_PTR(-ENOENT);
835 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
841 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
842 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
843 return ERR_PTR(-ENOENT);
846 if (info.polarity == GPIO_ACTIVE_LOW)
847 *lookupflags |= GPIO_ACTIVE_LOW;
849 err = acpi_gpio_update_gpiod_flags(dflags, info.flags);
851 dev_dbg(dev, "Override GPIO initialization flags\n");
857 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
858 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
859 * @propname: Property name of the GPIO
860 * @index: index of GpioIo/GpioInt resource (starting from %0)
861 * @info: info pointer to fill in (optional)
863 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
864 * Otherwise (ie. it is a data-only non-device object), use the property-based
865 * GPIO lookup to get to the GPIO resource with the relevant information and use
866 * that to obtain the GPIO descriptor to return.
868 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
869 const char *propname, int index,
870 struct acpi_gpio_info *info)
872 struct acpi_gpio_lookup lookup;
873 struct acpi_device *adev;
876 adev = to_acpi_device_node(fwnode);
878 return acpi_get_gpiod_by_index(adev, propname, index, info);
880 if (!is_acpi_data_node(fwnode))
881 return ERR_PTR(-ENODEV);
884 return ERR_PTR(-EINVAL);
886 memset(&lookup, 0, sizeof(lookup));
887 lookup.index = index;
889 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
893 ret = acpi_gpio_resource_lookup(&lookup, info);
894 return ret ? ERR_PTR(ret) : lookup.desc;
898 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
899 * @adev: pointer to a ACPI device to get IRQ from
900 * @index: index of GpioInt resource (starting from %0)
902 * If the device has one or more GpioInt resources, this function can be
903 * used to translate from the GPIO offset in the resource to the Linux IRQ
906 * The function is idempotent, though each time it runs it will configure GPIO
907 * pin direction according to the flags in GpioInt resource.
909 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
911 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
914 unsigned int irq_flags;
917 for (i = 0, idx = 0; idx <= index; i++) {
918 struct acpi_gpio_info info;
919 struct gpio_desc *desc;
921 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
923 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
924 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
925 return PTR_ERR(desc);
927 if (info.gpioint && idx++ == index) {
932 return PTR_ERR(desc);
934 irq = gpiod_to_irq(desc);
938 snprintf(label, sizeof(label), "GpioInt() %d", index);
939 ret = gpiod_configure_flags(desc, label, 0, info.flags);
943 irq_flags = acpi_dev_get_irq_type(info.triggering,
947 * If the IRQ is not already in use then set type
948 * if specified and different than the current one.
950 if (can_request_irq(irq, irq_flags)) {
951 if (irq_flags != IRQ_TYPE_NONE &&
952 irq_flags != irq_get_trigger_type(irq))
953 irq_set_irq_type(irq, irq_flags);
955 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
964 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
967 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
968 u32 bits, u64 *value, void *handler_context,
969 void *region_context)
971 struct acpi_gpio_chip *achip = region_context;
972 struct gpio_chip *chip = achip->chip;
973 struct acpi_resource_gpio *agpio;
974 struct acpi_resource *ares;
975 int pin_index = (int)address;
980 status = acpi_buffer_to_resource(achip->conn_info.connection,
981 achip->conn_info.length, &ares);
982 if (ACPI_FAILURE(status))
985 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
987 return AE_BAD_PARAMETER;
990 agpio = &ares->data.gpio;
992 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
993 function == ACPI_WRITE)) {
995 return AE_BAD_PARAMETER;
998 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
999 for (i = pin_index; i < length; ++i) {
1000 int pin = agpio->pin_table[i];
1001 struct acpi_gpio_connection *conn;
1002 struct gpio_desc *desc;
1005 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
1007 status = AE_BAD_PARAMETER;
1011 mutex_lock(&achip->conn_lock);
1014 list_for_each_entry(conn, &achip->conns, node) {
1015 if (conn->pin == pin) {
1023 * The same GPIO can be shared between operation region and
1024 * event but only if the access here is ACPI_READ. In that
1025 * case we "borrow" the event GPIO instead.
1027 if (!found && agpio->sharable == ACPI_SHARED &&
1028 function == ACPI_READ) {
1029 struct acpi_gpio_event *event;
1031 list_for_each_entry(event, &achip->events, node) {
1032 if (event->pin == pin) {
1041 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
1042 const char *label = "ACPI:OpRegion";
1045 desc = gpiochip_request_own_desc(chip, pin, label);
1048 mutex_unlock(&achip->conn_lock);
1052 err = gpiod_configure_flags(desc, label, 0, flags);
1054 status = AE_NOT_CONFIGURED;
1055 gpiochip_free_own_desc(desc);
1056 mutex_unlock(&achip->conn_lock);
1060 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1062 status = AE_NO_MEMORY;
1063 gpiochip_free_own_desc(desc);
1064 mutex_unlock(&achip->conn_lock);
1070 list_add_tail(&conn->node, &achip->conns);
1073 mutex_unlock(&achip->conn_lock);
1075 if (function == ACPI_WRITE)
1076 gpiod_set_raw_value_cansleep(desc,
1077 !!((1 << i) & *value));
1079 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1087 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1089 struct gpio_chip *chip = achip->chip;
1090 acpi_handle handle = ACPI_HANDLE(chip->parent);
1093 INIT_LIST_HEAD(&achip->conns);
1094 mutex_init(&achip->conn_lock);
1095 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1096 acpi_gpio_adr_space_handler,
1098 if (ACPI_FAILURE(status))
1099 dev_err(chip->parent,
1100 "Failed to install GPIO OpRegion handler\n");
1103 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1105 struct gpio_chip *chip = achip->chip;
1106 acpi_handle handle = ACPI_HANDLE(chip->parent);
1107 struct acpi_gpio_connection *conn, *tmp;
1110 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1111 acpi_gpio_adr_space_handler);
1112 if (ACPI_FAILURE(status)) {
1113 dev_err(chip->parent,
1114 "Failed to remove GPIO OpRegion handler\n");
1118 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1119 gpiochip_free_own_desc(conn->desc);
1120 list_del(&conn->node);
1125 static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
1126 struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
1127 const char **name, unsigned int *lflags, unsigned int *dflags)
1129 struct gpio_chip *chip = achip->chip;
1130 struct gpio_desc *desc;
1138 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1141 return ERR_PTR(ret);
1143 ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]);
1145 return ERR_PTR(ret);
1147 desc = gpiochip_get_desc(chip, ret);
1152 *lflags |= GPIO_ACTIVE_LOW;
1154 if (fwnode_property_present(fwnode, "input"))
1155 *dflags |= GPIOD_IN;
1156 else if (fwnode_property_present(fwnode, "output-low"))
1157 *dflags |= GPIOD_OUT_LOW;
1158 else if (fwnode_property_present(fwnode, "output-high"))
1159 *dflags |= GPIOD_OUT_HIGH;
1161 return ERR_PTR(-EINVAL);
1163 fwnode_property_read_string(fwnode, "line-name", name);
1168 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1170 struct gpio_chip *chip = achip->chip;
1171 struct fwnode_handle *fwnode;
1173 device_for_each_child_node(chip->parent, fwnode) {
1174 unsigned int lflags, dflags;
1175 struct gpio_desc *desc;
1179 if (!fwnode_property_present(fwnode, "gpio-hog"))
1182 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1187 ret = gpiod_hog(desc, name, lflags, dflags);
1189 dev_err(chip->parent, "Failed to hog GPIO\n");
1190 fwnode_handle_put(fwnode);
1196 void acpi_gpiochip_add(struct gpio_chip *chip)
1198 struct acpi_gpio_chip *acpi_gpio;
1202 if (!chip || !chip->parent)
1205 handle = ACPI_HANDLE(chip->parent);
1209 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1211 dev_err(chip->parent,
1212 "Failed to allocate memory for ACPI GPIO chip\n");
1216 acpi_gpio->chip = chip;
1217 INIT_LIST_HEAD(&acpi_gpio->events);
1218 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1220 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
1221 if (ACPI_FAILURE(status)) {
1222 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1228 devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
1230 acpi_gpiochip_request_regions(acpi_gpio);
1231 acpi_gpiochip_scan_gpios(acpi_gpio);
1232 acpi_walk_dep_device_list(handle);
1235 void acpi_gpiochip_remove(struct gpio_chip *chip)
1237 struct acpi_gpio_chip *acpi_gpio;
1241 if (!chip || !chip->parent)
1244 handle = ACPI_HANDLE(chip->parent);
1248 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1249 if (ACPI_FAILURE(status)) {
1250 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1254 acpi_gpiochip_free_regions(acpi_gpio);
1256 acpi_detach_data(handle, acpi_gpio_chip_dh);
1260 static int acpi_gpio_package_count(const union acpi_object *obj)
1262 const union acpi_object *element = obj->package.elements;
1263 const union acpi_object *end = element + obj->package.count;
1264 unsigned int count = 0;
1266 while (element < end) {
1267 switch (element->type) {
1268 case ACPI_TYPE_LOCAL_REFERENCE:
1271 case ACPI_TYPE_INTEGER:
1284 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1286 unsigned int *count = data;
1288 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1289 *count += ares->data.gpio.pin_table_length;
1295 * acpi_gpio_count - return the number of GPIOs associated with a
1296 * device / function or -ENOENT if no GPIO has been
1297 * assigned to the requested function.
1298 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1299 * @con_id: function within the GPIO consumer
1301 int acpi_gpio_count(struct device *dev, const char *con_id)
1303 struct acpi_device *adev = ACPI_COMPANION(dev);
1304 const union acpi_object *obj;
1305 const struct acpi_gpio_mapping *gm;
1306 int count = -ENOENT;
1311 /* Try first from _DSD */
1312 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1314 snprintf(propname, sizeof(propname), "%s-%s",
1315 con_id, gpio_suffixes[i]);
1317 snprintf(propname, sizeof(propname), "%s",
1320 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1323 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1325 else if (obj->type == ACPI_TYPE_PACKAGE)
1326 count = acpi_gpio_package_count(obj);
1327 } else if (adev->driver_gpios) {
1328 for (gm = adev->driver_gpios; gm->name; gm++)
1329 if (strcmp(propname, gm->name) == 0) {
1338 /* Then from plain _CRS GPIOs */
1340 struct list_head resource_list;
1341 unsigned int crs_count = 0;
1343 if (!acpi_can_fallback_to_crs(adev, con_id))
1346 INIT_LIST_HEAD(&resource_list);
1347 acpi_dev_get_resources(adev, &resource_list,
1348 acpi_find_gpio_count, &crs_count);
1349 acpi_dev_free_resource_list(&resource_list);
1353 return count ? count : -ENOENT;
1356 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1358 /* Never allow fallback if the device has properties */
1359 if (adev->data.properties || adev->driver_gpios)
1362 return con_id == NULL;
1365 /* Run deferred acpi_gpiochip_request_irqs() */
1366 static int acpi_gpio_handle_deferred_request_irqs(void)
1368 struct acpi_gpio_chip *acpi_gpio, *tmp;
1370 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1371 list_for_each_entry_safe(acpi_gpio, tmp,
1372 &acpi_gpio_deferred_req_irqs_list,
1373 deferred_req_irqs_list_entry)
1374 acpi_gpiochip_request_irqs(acpi_gpio);
1376 acpi_gpio_deferred_req_irqs_done = true;
1377 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1381 /* We must use _sync so that this runs after the first deferred_probe run */
1382 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1384 static const struct dmi_system_id gpiolib_acpi_quirks[] = {
1387 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
1388 * a non existing micro-USB-B connector which puts the HDMI
1389 * DDC pins in GPIO mode, breaking HDMI support.
1392 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1393 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1395 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1396 .no_edge_events_on_boot = true,
1401 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
1402 * instead of controlling the actual micro-USB-B turns the 5V
1403 * boost for its USB-A connector off. The actual micro-USB-B
1404 * connector is wired for charging only.
1407 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
1408 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
1410 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1411 .no_edge_events_on_boot = true,
1416 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
1417 * external embedded-controller connected via I2C + an ACPI GPIO
1418 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
1421 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1422 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
1424 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1425 .ignore_wake = "INT33FC:02@12",
1430 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
1431 * external embedded-controller connected via I2C + an ACPI GPIO
1432 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1433 * When suspending by closing the LID, the power to the USB
1434 * keyboard is turned off, causing INT0002 ACPI events to
1435 * trigger once the XHCI controller notices the keyboard is
1436 * gone. So INT0002 events cause spurious wakeups too. Ignoring
1437 * EC wakes breaks wakeup when opening the lid, the user needs
1438 * to press the power-button to wakeup the system. The
1439 * alternative is suspend simply not working, which is worse.
1442 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1443 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
1445 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1446 .ignore_wake = "INT33FF:01@0,INT0002:00@2",
1451 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
1452 * external embedded-controller connected via I2C + an ACPI GPIO
1453 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
1456 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1457 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1458 DMI_MATCH(DMI_BOARD_NAME, "815D"),
1460 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1461 .ignore_wake = "INT33FC:02@28",
1466 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
1467 * external embedded-controller connected via I2C + an ACPI GPIO
1468 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1471 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1472 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1473 DMI_MATCH(DMI_BOARD_NAME, "813E"),
1475 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1476 .ignore_wake = "INT33FF:01@0",
1479 {} /* Terminating entry */
1482 static int acpi_gpio_setup_params(void)
1484 const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
1485 const struct dmi_system_id *id;
1487 id = dmi_first_match(gpiolib_acpi_quirks);
1489 quirk = id->driver_data;
1491 if (run_edge_events_on_boot < 0) {
1492 if (quirk && quirk->no_edge_events_on_boot)
1493 run_edge_events_on_boot = 0;
1495 run_edge_events_on_boot = 1;
1498 if (ignore_wake == NULL && quirk && quirk->ignore_wake)
1499 ignore_wake = quirk->ignore_wake;
1504 /* Directly after dmi_setup() which runs as core_initcall() */
1505 postcore_initcall(acpi_gpio_setup_params);