1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI helpers for GPIO API
5 * Copyright (C) 2012, Intel Corporation
10 #include <linux/errno.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/gpio/driver.h>
13 #include <linux/gpio/machine.h>
14 #include <linux/export.h>
15 #include <linux/acpi.h>
16 #include <linux/interrupt.h>
17 #include <linux/mutex.h>
18 #include <linux/pinctrl/pinctrl.h>
23 * struct acpi_gpio_event - ACPI GPIO event handler data
25 * @node: list-entry of the events list of the struct acpi_gpio_chip
26 * @handle: handle of ACPI method to execute when the IRQ triggers
27 * @handler: handler function to pass to request_irq() when requesting the IRQ
28 * @pin: GPIO pin number on the struct gpio_chip
29 * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
30 * @irqflags: flags to pass to request_irq() when requesting the IRQ
31 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
32 * @irq_requested:True if request_irq() has been done
33 * @desc: struct gpio_desc for the GPIO pin for this event
35 struct acpi_gpio_event {
36 struct list_head node;
38 irq_handler_t handler;
41 unsigned long irqflags;
44 struct gpio_desc *desc;
47 struct acpi_gpio_connection {
48 struct list_head node;
50 struct gpio_desc *desc;
53 struct acpi_gpio_chip {
55 * ACPICA requires that the first field of the context parameter
56 * passed to acpi_install_address_space_handler() is large enough
57 * to hold struct acpi_connection_info.
59 struct acpi_connection_info conn_info;
60 struct list_head conns;
61 struct mutex conn_lock;
62 struct gpio_chip *chip;
63 struct list_head events;
64 struct list_head deferred_req_irqs_list_entry;
68 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
69 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
70 * late_initcall_sync() handler, so that other builtin drivers can register their
71 * OpRegions before the event handlers can run. This list contains GPIO chips
72 * for which the acpi_gpiochip_request_irqs() call has been deferred.
74 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
75 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
76 static bool acpi_gpio_deferred_req_irqs_done;
78 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
83 return ACPI_HANDLE(gc->parent) == data;
87 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
88 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
89 * @pin: ACPI GPIO pin number (0-based, controller-relative)
91 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
92 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
93 * controller does not have GPIO chip registered at the moment. This is to
94 * support probe deferral.
96 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
98 struct gpio_chip *chip;
102 status = acpi_get_handle(NULL, path, &handle);
103 if (ACPI_FAILURE(status))
104 return ERR_PTR(-ENODEV);
106 chip = gpiochip_find(handle, acpi_gpiochip_find);
108 return ERR_PTR(-EPROBE_DEFER);
110 return gpiochip_get_desc(chip, pin);
113 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
115 struct acpi_gpio_event *event = data;
117 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
122 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
124 struct acpi_gpio_event *event = data;
126 acpi_execute_simple_method(event->handle, NULL, event->pin);
131 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
133 /* The address of this function is used as a key. */
136 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
137 struct acpi_resource_gpio **agpio)
139 struct acpi_resource_gpio *gpio;
141 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
144 gpio = &ares->data.gpio;
145 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
151 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
153 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
154 struct acpi_gpio_event *event)
158 ret = request_threaded_irq(event->irq, NULL, event->handler,
159 event->irqflags, "ACPI:Event", event);
161 dev_err(acpi_gpio->chip->parent,
162 "Failed to setup interrupt handler for %d\n",
167 if (event->irq_is_wake)
168 enable_irq_wake(event->irq);
170 event->irq_requested = true;
172 /* Make sure we trigger the initial state of edge-triggered IRQs */
173 value = gpiod_get_raw_value_cansleep(event->desc);
174 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
175 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
176 event->handler(event->irq, event);
179 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
181 struct acpi_gpio_event *event;
183 list_for_each_entry(event, &acpi_gpio->events, node)
184 acpi_gpiochip_request_irq(acpi_gpio, event);
187 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
190 struct acpi_gpio_chip *acpi_gpio = context;
191 struct gpio_chip *chip = acpi_gpio->chip;
192 struct acpi_resource_gpio *agpio;
193 acpi_handle handle, evt_handle;
194 struct acpi_gpio_event *event;
195 irq_handler_t handler = NULL;
196 struct gpio_desc *desc;
199 if (!acpi_gpio_get_irq_resource(ares, &agpio))
202 handle = ACPI_HANDLE(chip->parent);
203 pin = agpio->pin_table[0];
207 sprintf(ev_name, "_%c%02hhX",
208 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
210 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
211 handler = acpi_gpio_irq_handler;
214 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
215 handler = acpi_gpio_irq_handler_evt;
220 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", 0);
222 dev_err(chip->parent, "Failed to request GPIO\n");
226 gpiod_direction_input(desc);
228 ret = gpiochip_lock_as_irq(chip, pin);
230 dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
234 irq = gpiod_to_irq(desc);
236 dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
237 goto fail_unlock_irq;
240 event = kzalloc(sizeof(*event), GFP_KERNEL);
242 goto fail_unlock_irq;
244 event->irqflags = IRQF_ONESHOT;
245 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
246 if (agpio->polarity == ACPI_ACTIVE_HIGH)
247 event->irqflags |= IRQF_TRIGGER_HIGH;
249 event->irqflags |= IRQF_TRIGGER_LOW;
251 switch (agpio->polarity) {
252 case ACPI_ACTIVE_HIGH:
253 event->irqflags |= IRQF_TRIGGER_RISING;
255 case ACPI_ACTIVE_LOW:
256 event->irqflags |= IRQF_TRIGGER_FALLING;
259 event->irqflags |= IRQF_TRIGGER_RISING |
260 IRQF_TRIGGER_FALLING;
265 event->handle = evt_handle;
266 event->handler = handler;
268 event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
272 list_add_tail(&event->node, &acpi_gpio->events);
277 gpiochip_unlock_as_irq(chip, pin);
279 gpiochip_free_own_desc(desc);
285 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
288 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
289 * handled by ACPI event methods which need to be called from the GPIO
290 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
291 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
292 * the ACPI event methods for those pins.
294 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
296 struct acpi_gpio_chip *acpi_gpio;
301 if (!chip->parent || !chip->to_irq)
304 handle = ACPI_HANDLE(chip->parent);
308 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
309 if (ACPI_FAILURE(status))
312 acpi_walk_resources(handle, "_AEI",
313 acpi_gpiochip_alloc_event, acpi_gpio);
315 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
316 defer = !acpi_gpio_deferred_req_irqs_done;
318 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
319 &acpi_gpio_deferred_req_irqs_list);
320 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
325 acpi_gpiochip_request_irqs(acpi_gpio);
327 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
330 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
333 * Free interrupts associated with GPIO ACPI event method for the given
336 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
338 struct acpi_gpio_chip *acpi_gpio;
339 struct acpi_gpio_event *event, *ep;
343 if (!chip->parent || !chip->to_irq)
346 handle = ACPI_HANDLE(chip->parent);
350 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
351 if (ACPI_FAILURE(status))
354 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
355 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
356 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
357 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
359 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
360 if (event->irq_requested) {
361 if (event->irq_is_wake)
362 disable_irq_wake(event->irq);
364 free_irq(event->irq, event);
367 gpiochip_unlock_as_irq(chip, event->pin);
368 gpiochip_free_own_desc(event->desc);
369 list_del(&event->node);
373 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
375 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
376 const struct acpi_gpio_mapping *gpios)
379 adev->driver_gpios = gpios;
384 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
386 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
388 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
391 int devm_acpi_dev_add_driver_gpios(struct device *dev,
392 const struct acpi_gpio_mapping *gpios)
397 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
401 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
406 devres_add(dev, res);
409 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
411 void devm_acpi_dev_remove_driver_gpios(struct device *dev)
413 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
415 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
417 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
418 const char *name, int index,
419 struct fwnode_reference_args *args,
420 unsigned int *quirks)
422 const struct acpi_gpio_mapping *gm;
424 if (!adev->driver_gpios)
427 for (gm = adev->driver_gpios; gm->name; gm++)
428 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
429 const struct acpi_gpio_params *par = gm->data + index;
431 args->fwnode = acpi_fwnode_handle(adev);
432 args->args[0] = par->crs_entry_index;
433 args->args[1] = par->line_index;
434 args->args[2] = par->active_low;
437 *quirks = gm->quirks;
444 static enum gpiod_flags
445 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
447 switch (agpio->io_restriction) {
448 case ACPI_IO_RESTRICT_INPUT:
450 case ACPI_IO_RESTRICT_OUTPUT:
452 * ACPI GPIO resources don't contain an initial value for the
453 * GPIO. Therefore we deduce that value from the pull field
454 * instead. If the pin is pulled up we assume default to be
455 * high, if it is pulled down we assume default to be low,
456 * otherwise we leave pin untouched.
458 switch (agpio->pin_config) {
459 case ACPI_PIN_CONFIG_PULLUP:
460 return GPIOD_OUT_HIGH;
461 case ACPI_PIN_CONFIG_PULLDOWN:
462 return GPIOD_OUT_LOW;
471 * Assume that the BIOS has configured the direction and pull
478 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
480 const enum gpiod_flags mask =
481 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
482 GPIOD_FLAGS_BIT_DIR_VAL;
486 * Check if the BIOS has IoRestriction with explicitly set direction
487 * and update @flags accordingly. Otherwise use whatever caller asked
490 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
491 enum gpiod_flags diff = *flags ^ update;
494 * Check if caller supplied incompatible GPIO initialization
497 * Return %-EINVAL to notify that firmware has different
498 * settings and we are going to use them.
500 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
501 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
503 *flags = (*flags & ~mask) | (update & mask);
509 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
511 struct device *dev = &info->adev->dev;
512 enum gpiod_flags old = *flags;
515 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
516 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
518 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
521 dev_dbg(dev, "Override GPIO initialization flags\n");
528 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
529 struct acpi_gpio_info *info)
531 switch (info->pin_config) {
532 case ACPI_PIN_CONFIG_PULLUP:
533 *lookupflags |= GPIO_PULL_UP;
535 case ACPI_PIN_CONFIG_PULLDOWN:
536 *lookupflags |= GPIO_PULL_DOWN;
542 if (info->polarity == GPIO_ACTIVE_LOW)
543 *lookupflags |= GPIO_ACTIVE_LOW;
548 struct acpi_gpio_lookup {
549 struct acpi_gpio_info info;
553 struct gpio_desc *desc;
557 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
559 struct acpi_gpio_lookup *lookup = data;
561 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
565 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
566 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
569 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
572 if (lookup->n++ != lookup->index)
575 pin_index = lookup->pin_index;
576 if (pin_index >= agpio->pin_table_length)
579 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
580 agpio->pin_table[pin_index]);
581 lookup->info.pin_config = agpio->pin_config;
582 lookup->info.gpioint = gpioint;
585 * Polarity and triggering are only specified for GpioInt
587 * Note: we expect here:
588 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
589 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
591 if (lookup->info.gpioint) {
592 lookup->info.flags = GPIOD_IN;
593 lookup->info.polarity = agpio->polarity;
594 lookup->info.triggering = agpio->triggering;
596 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
597 lookup->info.polarity = lookup->active_low;
604 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
605 struct acpi_gpio_info *info)
607 struct acpi_device *adev = lookup->info.adev;
608 struct list_head res_list;
611 INIT_LIST_HEAD(&res_list);
613 ret = acpi_dev_get_resources(adev, &res_list,
614 acpi_populate_gpio_lookup,
619 acpi_dev_free_resource_list(&res_list);
625 *info = lookup->info;
629 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
630 const char *propname, int index,
631 struct acpi_gpio_lookup *lookup)
633 struct fwnode_reference_args args;
634 unsigned int quirks = 0;
637 memset(&args, 0, sizeof(args));
638 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
641 struct acpi_device *adev = to_acpi_device_node(fwnode);
646 if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
651 * The property was found and resolved, so need to lookup the GPIO based
654 if (!to_acpi_device_node(args.fwnode))
659 lookup->index = args.args[0];
660 lookup->pin_index = args.args[1];
661 lookup->active_low = !!args.args[2];
663 lookup->info.adev = to_acpi_device_node(args.fwnode);
664 lookup->info.quirks = quirks;
670 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
671 * @adev: pointer to a ACPI device to get GPIO from
672 * @propname: Property name of the GPIO (optional)
673 * @index: index of GpioIo/GpioInt resource (starting from %0)
674 * @info: info pointer to fill in (optional)
676 * Function goes through ACPI resources for @adev and based on @index looks
677 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
678 * and returns it. @index matches GpioIo/GpioInt resources only so if there
679 * are total %3 GPIO resources, the index goes from %0 to %2.
681 * If @propname is specified the GPIO is looked using device property. In
682 * that case @index is used to select the GPIO entry in the property value
683 * (in case of multiple).
685 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
688 * Note: if the GPIO resource has multiple entries in the pin list, this
689 * function only returns the first.
691 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
692 const char *propname, int index,
693 struct acpi_gpio_info *info)
695 struct acpi_gpio_lookup lookup;
699 return ERR_PTR(-ENODEV);
701 memset(&lookup, 0, sizeof(lookup));
702 lookup.index = index;
705 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
707 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
708 propname, index, &lookup);
712 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
713 dev_name(&lookup.info.adev->dev), lookup.index,
714 lookup.pin_index, lookup.active_low);
716 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
717 lookup.info.adev = adev;
720 ret = acpi_gpio_resource_lookup(&lookup, info);
721 return ret ? ERR_PTR(ret) : lookup.desc;
724 struct gpio_desc *acpi_find_gpio(struct device *dev,
727 enum gpiod_flags *dflags,
728 unsigned long *lookupflags)
730 struct acpi_device *adev = ACPI_COMPANION(dev);
731 struct acpi_gpio_info info;
732 struct gpio_desc *desc;
736 /* Try first from _DSD */
737 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
739 snprintf(propname, sizeof(propname), "%s-%s",
740 con_id, gpio_suffixes[i]);
742 snprintf(propname, sizeof(propname), "%s",
746 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
749 if (PTR_ERR(desc) == -EPROBE_DEFER)
750 return ERR_CAST(desc);
753 /* Then from plain _CRS GPIOs */
755 if (!acpi_can_fallback_to_crs(adev, con_id))
756 return ERR_PTR(-ENOENT);
758 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
764 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
765 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
766 return ERR_PTR(-ENOENT);
769 acpi_gpio_update_gpiod_flags(dflags, &info);
770 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
775 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
776 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
777 * @propname: Property name of the GPIO
778 * @index: index of GpioIo/GpioInt resource (starting from %0)
779 * @info: info pointer to fill in (optional)
781 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
782 * Otherwise (i.e. it is a data-only non-device object), use the property-based
783 * GPIO lookup to get to the GPIO resource with the relevant information and use
784 * that to obtain the GPIO descriptor to return.
786 * If the GPIO cannot be translated or there is an error an ERR_PTR is
789 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
790 const char *propname, int index,
791 struct acpi_gpio_info *info)
793 struct acpi_gpio_lookup lookup;
794 struct acpi_device *adev;
797 adev = to_acpi_device_node(fwnode);
799 return acpi_get_gpiod_by_index(adev, propname, index, info);
801 if (!is_acpi_data_node(fwnode))
802 return ERR_PTR(-ENODEV);
805 return ERR_PTR(-EINVAL);
807 memset(&lookup, 0, sizeof(lookup));
808 lookup.index = index;
810 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
814 ret = acpi_gpio_resource_lookup(&lookup, info);
815 return ret ? ERR_PTR(ret) : lookup.desc;
819 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
820 * @adev: pointer to a ACPI device to get IRQ from
821 * @index: index of GpioInt resource (starting from %0)
823 * If the device has one or more GpioInt resources, this function can be
824 * used to translate from the GPIO offset in the resource to the Linux IRQ
827 * The function is idempotent, though each time it runs it will configure GPIO
828 * pin direction according to the flags in GpioInt resource.
830 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
832 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
835 unsigned int irq_flags;
838 for (i = 0, idx = 0; idx <= index; i++) {
839 struct acpi_gpio_info info;
840 struct gpio_desc *desc;
842 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
844 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
845 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
846 return PTR_ERR(desc);
848 if (info.gpioint && idx++ == index) {
849 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
854 return PTR_ERR(desc);
856 irq = gpiod_to_irq(desc);
860 snprintf(label, sizeof(label), "GpioInt() %d", index);
861 ret = gpiod_configure_flags(desc, label, lflags, info.flags);
865 irq_flags = acpi_dev_get_irq_type(info.triggering,
868 /* Set type if specified and different than the current one */
869 if (irq_flags != IRQ_TYPE_NONE &&
870 irq_flags != irq_get_trigger_type(irq))
871 irq_set_irq_type(irq, irq_flags);
879 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
882 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
883 u32 bits, u64 *value, void *handler_context,
884 void *region_context)
886 struct acpi_gpio_chip *achip = region_context;
887 struct gpio_chip *chip = achip->chip;
888 struct acpi_resource_gpio *agpio;
889 struct acpi_resource *ares;
890 int pin_index = (int)address;
895 status = acpi_buffer_to_resource(achip->conn_info.connection,
896 achip->conn_info.length, &ares);
897 if (ACPI_FAILURE(status))
900 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
902 return AE_BAD_PARAMETER;
905 agpio = &ares->data.gpio;
907 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
908 function == ACPI_WRITE)) {
910 return AE_BAD_PARAMETER;
913 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
914 for (i = pin_index; i < length; ++i) {
915 int pin = agpio->pin_table[i];
916 struct acpi_gpio_connection *conn;
917 struct gpio_desc *desc;
920 mutex_lock(&achip->conn_lock);
923 list_for_each_entry(conn, &achip->conns, node) {
924 if (conn->pin == pin) {
932 * The same GPIO can be shared between operation region and
933 * event but only if the access here is ACPI_READ. In that
934 * case we "borrow" the event GPIO instead.
936 if (!found && agpio->shareable == ACPI_SHARED &&
937 function == ACPI_READ) {
938 struct acpi_gpio_event *event;
940 list_for_each_entry(event, &achip->events, node) {
941 if (event->pin == pin) {
950 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
951 const char *label = "ACPI:OpRegion";
953 desc = gpiochip_request_own_desc(chip, pin, label,
957 mutex_unlock(&achip->conn_lock);
961 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
963 status = AE_NO_MEMORY;
964 gpiochip_free_own_desc(desc);
965 mutex_unlock(&achip->conn_lock);
971 list_add_tail(&conn->node, &achip->conns);
974 mutex_unlock(&achip->conn_lock);
976 if (function == ACPI_WRITE)
977 gpiod_set_raw_value_cansleep(desc,
978 !!((1 << i) & *value));
980 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
988 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
990 struct gpio_chip *chip = achip->chip;
991 acpi_handle handle = ACPI_HANDLE(chip->parent);
994 INIT_LIST_HEAD(&achip->conns);
995 mutex_init(&achip->conn_lock);
996 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
997 acpi_gpio_adr_space_handler,
999 if (ACPI_FAILURE(status))
1000 dev_err(chip->parent,
1001 "Failed to install GPIO OpRegion handler\n");
1004 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1006 struct gpio_chip *chip = achip->chip;
1007 acpi_handle handle = ACPI_HANDLE(chip->parent);
1008 struct acpi_gpio_connection *conn, *tmp;
1011 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1012 acpi_gpio_adr_space_handler);
1013 if (ACPI_FAILURE(status)) {
1014 dev_err(chip->parent,
1015 "Failed to remove GPIO OpRegion handler\n");
1019 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1020 gpiochip_free_own_desc(conn->desc);
1021 list_del(&conn->node);
1026 static struct gpio_desc *
1027 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1028 struct fwnode_handle *fwnode,
1030 unsigned long *lflags,
1031 enum gpiod_flags *dflags)
1033 struct gpio_chip *chip = achip->chip;
1034 struct gpio_desc *desc;
1038 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1042 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1045 return ERR_PTR(ret);
1047 desc = gpiochip_get_desc(chip, gpios[0]);
1052 *lflags |= GPIO_ACTIVE_LOW;
1054 if (fwnode_property_present(fwnode, "input"))
1055 *dflags |= GPIOD_IN;
1056 else if (fwnode_property_present(fwnode, "output-low"))
1057 *dflags |= GPIOD_OUT_LOW;
1058 else if (fwnode_property_present(fwnode, "output-high"))
1059 *dflags |= GPIOD_OUT_HIGH;
1061 return ERR_PTR(-EINVAL);
1063 fwnode_property_read_string(fwnode, "line-name", name);
1068 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1070 struct gpio_chip *chip = achip->chip;
1071 struct fwnode_handle *fwnode;
1073 device_for_each_child_node(chip->parent, fwnode) {
1074 unsigned long lflags;
1075 enum gpiod_flags dflags;
1076 struct gpio_desc *desc;
1080 if (!fwnode_property_present(fwnode, "gpio-hog"))
1083 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1088 ret = gpiod_hog(desc, name, lflags, dflags);
1090 dev_err(chip->parent, "Failed to hog GPIO\n");
1091 fwnode_handle_put(fwnode);
1097 void acpi_gpiochip_add(struct gpio_chip *chip)
1099 struct acpi_gpio_chip *acpi_gpio;
1103 if (!chip || !chip->parent)
1106 handle = ACPI_HANDLE(chip->parent);
1110 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1112 dev_err(chip->parent,
1113 "Failed to allocate memory for ACPI GPIO chip\n");
1117 acpi_gpio->chip = chip;
1118 INIT_LIST_HEAD(&acpi_gpio->events);
1119 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1121 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
1122 if (ACPI_FAILURE(status)) {
1123 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1129 devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
1131 acpi_gpiochip_request_regions(acpi_gpio);
1132 acpi_gpiochip_scan_gpios(acpi_gpio);
1133 acpi_walk_dep_device_list(handle);
1136 void acpi_gpiochip_remove(struct gpio_chip *chip)
1138 struct acpi_gpio_chip *acpi_gpio;
1142 if (!chip || !chip->parent)
1145 handle = ACPI_HANDLE(chip->parent);
1149 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1150 if (ACPI_FAILURE(status)) {
1151 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1155 acpi_gpiochip_free_regions(acpi_gpio);
1157 acpi_detach_data(handle, acpi_gpio_chip_dh);
1161 static int acpi_gpio_package_count(const union acpi_object *obj)
1163 const union acpi_object *element = obj->package.elements;
1164 const union acpi_object *end = element + obj->package.count;
1165 unsigned int count = 0;
1167 while (element < end) {
1168 switch (element->type) {
1169 case ACPI_TYPE_LOCAL_REFERENCE:
1172 case ACPI_TYPE_INTEGER:
1185 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1187 unsigned int *count = data;
1189 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1190 *count += ares->data.gpio.pin_table_length;
1196 * acpi_gpio_count - count the GPIOs associated with a device / function
1197 * @dev: GPIO consumer, can be %NULL for system-global GPIOs
1198 * @con_id: function within the GPIO consumer
1201 * The number of GPIOs associated with a device / function or %-ENOENT,
1202 * if no GPIO has been assigned to the requested function.
1204 int acpi_gpio_count(struct device *dev, const char *con_id)
1206 struct acpi_device *adev = ACPI_COMPANION(dev);
1207 const union acpi_object *obj;
1208 const struct acpi_gpio_mapping *gm;
1209 int count = -ENOENT;
1214 /* Try first from _DSD */
1215 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1217 snprintf(propname, sizeof(propname), "%s-%s",
1218 con_id, gpio_suffixes[i]);
1220 snprintf(propname, sizeof(propname), "%s",
1223 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1226 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1228 else if (obj->type == ACPI_TYPE_PACKAGE)
1229 count = acpi_gpio_package_count(obj);
1230 } else if (adev->driver_gpios) {
1231 for (gm = adev->driver_gpios; gm->name; gm++)
1232 if (strcmp(propname, gm->name) == 0) {
1241 /* Then from plain _CRS GPIOs */
1243 struct list_head resource_list;
1244 unsigned int crs_count = 0;
1246 if (!acpi_can_fallback_to_crs(adev, con_id))
1249 INIT_LIST_HEAD(&resource_list);
1250 acpi_dev_get_resources(adev, &resource_list,
1251 acpi_find_gpio_count, &crs_count);
1252 acpi_dev_free_resource_list(&resource_list);
1256 return count ? count : -ENOENT;
1259 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1261 /* Never allow fallback if the device has properties */
1262 if (acpi_dev_has_props(adev) || adev->driver_gpios)
1265 return con_id == NULL;
1268 /* Run deferred acpi_gpiochip_request_irqs() */
1269 static int acpi_gpio_handle_deferred_request_irqs(void)
1271 struct acpi_gpio_chip *acpi_gpio, *tmp;
1273 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1274 list_for_each_entry_safe(acpi_gpio, tmp,
1275 &acpi_gpio_deferred_req_irqs_list,
1276 deferred_req_irqs_list_entry)
1277 acpi_gpiochip_request_irqs(acpi_gpio);
1279 acpi_gpio_deferred_req_irqs_done = true;
1280 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1284 /* We must use _sync so that this runs after the first deferred_probe run */
1285 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);