1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI helpers for GPIO API
5 * Copyright (C) 2012, Intel Corporation
6 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
10 #include <linux/dmi.h>
11 #include <linux/errno.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/gpio/driver.h>
14 #include <linux/gpio/machine.h>
15 #include <linux/export.h>
16 #include <linux/acpi.h>
17 #include <linux/interrupt.h>
18 #include <linux/mutex.h>
19 #include <linux/pinctrl/pinctrl.h>
22 #include "gpiolib-acpi.h"
24 static int run_edge_events_on_boot = -1;
25 module_param(run_edge_events_on_boot, int, 0444);
26 MODULE_PARM_DESC(run_edge_events_on_boot,
27 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
29 static char *ignore_wake;
30 module_param(ignore_wake, charp, 0444);
31 MODULE_PARM_DESC(ignore_wake,
32 "controller@pin combos on which to ignore the ACPI wake flag "
33 "ignore_wake=controller@pin[,controller@pin[,...]]");
35 struct acpi_gpiolib_dmi_quirk {
36 bool no_edge_events_on_boot;
41 * struct acpi_gpio_event - ACPI GPIO event handler data
43 * @node: list-entry of the events list of the struct acpi_gpio_chip
44 * @handle: handle of ACPI method to execute when the IRQ triggers
45 * @handler: handler function to pass to request_irq() when requesting the IRQ
46 * @pin: GPIO pin number on the struct gpio_chip
47 * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
48 * @irqflags: flags to pass to request_irq() when requesting the IRQ
49 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
50 * @irq_requested:True if request_irq() has been done
51 * @desc: struct gpio_desc for the GPIO pin for this event
53 struct acpi_gpio_event {
54 struct list_head node;
56 irq_handler_t handler;
59 unsigned long irqflags;
62 struct gpio_desc *desc;
65 struct acpi_gpio_connection {
66 struct list_head node;
68 struct gpio_desc *desc;
71 struct acpi_gpio_chip {
73 * ACPICA requires that the first field of the context parameter
74 * passed to acpi_install_address_space_handler() is large enough
75 * to hold struct acpi_connection_info.
77 struct acpi_connection_info conn_info;
78 struct list_head conns;
79 struct mutex conn_lock;
80 struct gpio_chip *chip;
81 struct list_head events;
82 struct list_head deferred_req_irqs_list_entry;
86 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
87 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
88 * late_initcall_sync() handler, so that other builtin drivers can register their
89 * OpRegions before the event handlers can run. This list contains GPIO chips
90 * for which the acpi_gpiochip_request_irqs() call has been deferred.
92 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
93 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
94 static bool acpi_gpio_deferred_req_irqs_done;
96 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
101 return ACPI_HANDLE(gc->parent) == data;
105 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
106 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
107 * @pin: ACPI GPIO pin number (0-based, controller-relative)
109 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
110 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
111 * controller does not have GPIO chip registered at the moment. This is to
112 * support probe deferral.
114 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
116 struct gpio_chip *chip;
120 status = acpi_get_handle(NULL, path, &handle);
121 if (ACPI_FAILURE(status))
122 return ERR_PTR(-ENODEV);
124 chip = gpiochip_find(handle, acpi_gpiochip_find);
126 return ERR_PTR(-EPROBE_DEFER);
128 return gpiochip_get_desc(chip, pin);
132 * acpi_get_and_request_gpiod - Translate ACPI GPIO pin to GPIO descriptor and
133 * hold a refcount to the GPIO device.
134 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
135 * @pin: ACPI GPIO pin number (0-based, controller-relative)
136 * @label: Label to pass to gpiod_request()
138 * This function is a simple pass-through to acpi_get_gpiod(), except that
139 * as it is intended for use outside of the GPIO layer (in a similar fashion to
140 * gpiod_get_index() for example) it also holds a reference to the GPIO device.
142 struct gpio_desc *acpi_get_and_request_gpiod(char *path, int pin, char *label)
144 struct gpio_desc *gpio;
147 gpio = acpi_get_gpiod(path, pin);
151 ret = gpiod_request(gpio, label);
157 EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod);
159 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
161 struct acpi_gpio_event *event = data;
163 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
168 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
170 struct acpi_gpio_event *event = data;
172 acpi_execute_simple_method(event->handle, NULL, event->pin);
177 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
179 /* The address of this function is used as a key. */
182 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
183 struct acpi_resource_gpio **agpio)
185 struct acpi_resource_gpio *gpio;
187 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
190 gpio = &ares->data.gpio;
191 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
197 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
200 * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
201 * I/O resource or return False if not.
202 * @ares: Pointer to the ACPI resource to fetch
203 * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
205 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
206 struct acpi_resource_gpio **agpio)
208 struct acpi_resource_gpio *gpio;
210 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
213 gpio = &ares->data.gpio;
214 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
220 EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
222 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
223 struct acpi_gpio_event *event)
227 ret = request_threaded_irq(event->irq, NULL, event->handler,
228 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
230 dev_err(acpi_gpio->chip->parent,
231 "Failed to setup interrupt handler for %d\n",
236 if (event->irq_is_wake)
237 enable_irq_wake(event->irq);
239 event->irq_requested = true;
241 /* Make sure we trigger the initial state of edge-triggered IRQs */
242 if (run_edge_events_on_boot &&
243 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
244 value = gpiod_get_raw_value_cansleep(event->desc);
245 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
246 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
247 event->handler(event->irq, event);
251 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
253 struct acpi_gpio_event *event;
255 list_for_each_entry(event, &acpi_gpio->events, node)
256 acpi_gpiochip_request_irq(acpi_gpio, event);
259 static enum gpiod_flags
260 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
262 /* GpioInt() implies input configuration */
263 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
266 switch (agpio->io_restriction) {
267 case ACPI_IO_RESTRICT_INPUT:
269 case ACPI_IO_RESTRICT_OUTPUT:
271 * ACPI GPIO resources don't contain an initial value for the
272 * GPIO. Therefore we deduce that value from the pull field
273 * and the polarity instead. If the pin is pulled up we assume
274 * default to be high, if it is pulled down we assume default
275 * to be low, otherwise we leave pin untouched. For active low
276 * polarity values will be switched. See also
277 * Documentation/firmware-guide/acpi/gpio-properties.rst.
279 switch (agpio->pin_config) {
280 case ACPI_PIN_CONFIG_PULLUP:
281 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
282 case ACPI_PIN_CONFIG_PULLDOWN:
283 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
293 * Assume that the BIOS has configured the direction and pull
299 static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
300 struct acpi_resource_gpio *agpio,
304 int polarity = GPIO_ACTIVE_HIGH;
305 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
306 unsigned int pin = agpio->pin_table[index];
307 struct gpio_desc *desc;
310 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
314 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout);
316 dev_warn(chip->parent,
317 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
323 static bool acpi_gpio_in_ignore_list(const char *controller_in, int pin_in)
325 const char *controller, *pin_str;
329 controller = ignore_wake;
331 pin_str = strchr(controller, '@');
335 len = pin_str - controller;
336 if (len == strlen(controller_in) &&
337 strncmp(controller, controller_in, len) == 0) {
338 pin = simple_strtoul(pin_str + 1, &endp, 10);
339 if (*endp != 0 && *endp != ',')
346 controller = strchr(controller, ',');
353 pr_err_once("Error invalid value for gpiolib_acpi.ignore_wake: %s\n",
358 static bool acpi_gpio_irq_is_wake(struct device *parent,
359 struct acpi_resource_gpio *agpio)
361 int pin = agpio->pin_table[0];
363 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
366 if (acpi_gpio_in_ignore_list(dev_name(parent), pin)) {
367 dev_info(parent, "Ignoring wakeup on pin %d\n", pin);
374 /* Always returns AE_OK so that we keep looping over the resources */
375 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
378 struct acpi_gpio_chip *acpi_gpio = context;
379 struct gpio_chip *chip = acpi_gpio->chip;
380 struct acpi_resource_gpio *agpio;
381 acpi_handle handle, evt_handle;
382 struct acpi_gpio_event *event;
383 irq_handler_t handler = NULL;
384 struct gpio_desc *desc;
387 if (!acpi_gpio_get_irq_resource(ares, &agpio))
390 handle = ACPI_HANDLE(chip->parent);
391 pin = agpio->pin_table[0];
395 sprintf(ev_name, "_%c%02hhX",
396 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
398 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
399 handler = acpi_gpio_irq_handler;
402 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
403 handler = acpi_gpio_irq_handler_evt;
408 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
410 dev_err(chip->parent,
411 "Failed to request GPIO for pin 0x%04X, err %ld\n",
416 ret = gpiochip_lock_as_irq(chip, pin);
418 dev_err(chip->parent,
419 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
424 irq = gpiod_to_irq(desc);
426 dev_err(chip->parent,
427 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
429 goto fail_unlock_irq;
432 event = kzalloc(sizeof(*event), GFP_KERNEL);
434 goto fail_unlock_irq;
436 event->irqflags = IRQF_ONESHOT;
437 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
438 if (agpio->polarity == ACPI_ACTIVE_HIGH)
439 event->irqflags |= IRQF_TRIGGER_HIGH;
441 event->irqflags |= IRQF_TRIGGER_LOW;
443 switch (agpio->polarity) {
444 case ACPI_ACTIVE_HIGH:
445 event->irqflags |= IRQF_TRIGGER_RISING;
447 case ACPI_ACTIVE_LOW:
448 event->irqflags |= IRQF_TRIGGER_FALLING;
451 event->irqflags |= IRQF_TRIGGER_RISING |
452 IRQF_TRIGGER_FALLING;
457 event->handle = evt_handle;
458 event->handler = handler;
460 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
464 list_add_tail(&event->node, &acpi_gpio->events);
469 gpiochip_unlock_as_irq(chip, pin);
471 gpiochip_free_own_desc(desc);
477 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
480 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
481 * handled by ACPI event methods which need to be called from the GPIO
482 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
483 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
484 * the ACPI event methods for those pins.
486 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
488 struct acpi_gpio_chip *acpi_gpio;
493 if (!chip->parent || !chip->to_irq)
496 handle = ACPI_HANDLE(chip->parent);
500 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
501 if (ACPI_FAILURE(status))
504 acpi_walk_resources(handle, "_AEI",
505 acpi_gpiochip_alloc_event, acpi_gpio);
507 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
508 defer = !acpi_gpio_deferred_req_irqs_done;
510 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
511 &acpi_gpio_deferred_req_irqs_list);
512 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
517 acpi_gpiochip_request_irqs(acpi_gpio);
519 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
522 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
525 * Free interrupts associated with GPIO ACPI event method for the given
528 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
530 struct acpi_gpio_chip *acpi_gpio;
531 struct acpi_gpio_event *event, *ep;
535 if (!chip->parent || !chip->to_irq)
538 handle = ACPI_HANDLE(chip->parent);
542 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
543 if (ACPI_FAILURE(status))
546 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
547 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
548 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
549 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
551 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
552 if (event->irq_requested) {
553 if (event->irq_is_wake)
554 disable_irq_wake(event->irq);
556 free_irq(event->irq, event);
559 gpiochip_unlock_as_irq(chip, event->pin);
560 gpiochip_free_own_desc(event->desc);
561 list_del(&event->node);
565 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
567 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
568 const struct acpi_gpio_mapping *gpios)
571 adev->driver_gpios = gpios;
576 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
578 void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
581 adev->driver_gpios = NULL;
583 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
585 static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
587 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
590 int devm_acpi_dev_add_driver_gpios(struct device *dev,
591 const struct acpi_gpio_mapping *gpios)
596 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
600 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
605 devres_add(dev, res);
608 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
610 void devm_acpi_dev_remove_driver_gpios(struct device *dev)
612 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
614 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
616 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
617 const char *name, int index,
618 struct fwnode_reference_args *args,
619 unsigned int *quirks)
621 const struct acpi_gpio_mapping *gm;
623 if (!adev->driver_gpios)
626 for (gm = adev->driver_gpios; gm->name; gm++)
627 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
628 const struct acpi_gpio_params *par = gm->data + index;
630 args->fwnode = acpi_fwnode_handle(adev);
631 args->args[0] = par->crs_entry_index;
632 args->args[1] = par->line_index;
633 args->args[2] = par->active_low;
636 *quirks = gm->quirks;
644 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
646 const enum gpiod_flags mask =
647 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
648 GPIOD_FLAGS_BIT_DIR_VAL;
652 * Check if the BIOS has IoRestriction with explicitly set direction
653 * and update @flags accordingly. Otherwise use whatever caller asked
656 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
657 enum gpiod_flags diff = *flags ^ update;
660 * Check if caller supplied incompatible GPIO initialization
663 * Return %-EINVAL to notify that firmware has different
664 * settings and we are going to use them.
666 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
667 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
669 *flags = (*flags & ~mask) | (update & mask);
675 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
677 struct device *dev = &info->adev->dev;
678 enum gpiod_flags old = *flags;
681 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
682 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
684 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
687 dev_dbg(dev, "Override GPIO initialization flags\n");
694 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
695 struct acpi_gpio_info *info)
697 switch (info->pin_config) {
698 case ACPI_PIN_CONFIG_PULLUP:
699 *lookupflags |= GPIO_PULL_UP;
701 case ACPI_PIN_CONFIG_PULLDOWN:
702 *lookupflags |= GPIO_PULL_DOWN;
708 if (info->polarity == GPIO_ACTIVE_LOW)
709 *lookupflags |= GPIO_ACTIVE_LOW;
714 struct acpi_gpio_lookup {
715 struct acpi_gpio_info info;
719 struct gpio_desc *desc;
723 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
725 struct acpi_gpio_lookup *lookup = data;
727 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
731 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
732 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
733 struct gpio_desc *desc;
736 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
739 if (lookup->n++ != lookup->index)
742 pin_index = lookup->pin_index;
743 if (pin_index >= agpio->pin_table_length)
746 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
747 desc = gpio_to_desc(agpio->pin_table[pin_index]);
749 desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
750 agpio->pin_table[pin_index]);
752 lookup->info.pin_config = agpio->pin_config;
753 lookup->info.debounce = agpio->debounce_timeout;
754 lookup->info.gpioint = gpioint;
757 * Polarity and triggering are only specified for GpioInt
759 * Note: we expect here:
760 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
761 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
763 if (lookup->info.gpioint) {
764 lookup->info.polarity = agpio->polarity;
765 lookup->info.triggering = agpio->triggering;
767 lookup->info.polarity = lookup->active_low;
770 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
776 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
777 struct acpi_gpio_info *info)
779 struct acpi_device *adev = lookup->info.adev;
780 struct list_head res_list;
783 INIT_LIST_HEAD(&res_list);
785 ret = acpi_dev_get_resources(adev, &res_list,
786 acpi_populate_gpio_lookup,
791 acpi_dev_free_resource_list(&res_list);
797 *info = lookup->info;
801 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
802 const char *propname, int index,
803 struct acpi_gpio_lookup *lookup)
805 struct fwnode_reference_args args;
806 unsigned int quirks = 0;
809 memset(&args, 0, sizeof(args));
810 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
813 struct acpi_device *adev = to_acpi_device_node(fwnode);
818 if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
823 * The property was found and resolved, so need to lookup the GPIO based
826 if (!to_acpi_device_node(args.fwnode))
831 lookup->index = args.args[0];
832 lookup->pin_index = args.args[1];
833 lookup->active_low = !!args.args[2];
835 lookup->info.adev = to_acpi_device_node(args.fwnode);
836 lookup->info.quirks = quirks;
842 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
843 * @adev: pointer to a ACPI device to get GPIO from
844 * @propname: Property name of the GPIO (optional)
845 * @index: index of GpioIo/GpioInt resource (starting from %0)
846 * @info: info pointer to fill in (optional)
848 * Function goes through ACPI resources for @adev and based on @index looks
849 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
850 * and returns it. @index matches GpioIo/GpioInt resources only so if there
851 * are total %3 GPIO resources, the index goes from %0 to %2.
853 * If @propname is specified the GPIO is looked using device property. In
854 * that case @index is used to select the GPIO entry in the property value
855 * (in case of multiple).
857 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
860 * Note: if the GPIO resource has multiple entries in the pin list, this
861 * function only returns the first.
863 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
864 const char *propname, int index,
865 struct acpi_gpio_info *info)
867 struct acpi_gpio_lookup lookup;
871 return ERR_PTR(-ENODEV);
873 memset(&lookup, 0, sizeof(lookup));
874 lookup.index = index;
877 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
879 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
880 propname, index, &lookup);
884 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
885 dev_name(&lookup.info.adev->dev), lookup.index,
886 lookup.pin_index, lookup.active_low);
888 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
889 lookup.info.adev = adev;
892 ret = acpi_gpio_resource_lookup(&lookup, info);
893 return ret ? ERR_PTR(ret) : lookup.desc;
896 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
899 /* Never allow fallback if the device has properties */
900 if (acpi_dev_has_props(adev) || adev->driver_gpios)
903 return con_id == NULL;
906 struct gpio_desc *acpi_find_gpio(struct device *dev,
909 enum gpiod_flags *dflags,
910 unsigned long *lookupflags)
912 struct acpi_device *adev = ACPI_COMPANION(dev);
913 struct acpi_gpio_info info;
914 struct gpio_desc *desc;
918 /* Try first from _DSD */
919 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
921 snprintf(propname, sizeof(propname), "%s-%s",
922 con_id, gpio_suffixes[i]);
924 snprintf(propname, sizeof(propname), "%s",
928 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
931 if (PTR_ERR(desc) == -EPROBE_DEFER)
932 return ERR_CAST(desc);
935 /* Then from plain _CRS GPIOs */
937 if (!acpi_can_fallback_to_crs(adev, con_id))
938 return ERR_PTR(-ENOENT);
940 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
946 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
947 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
948 return ERR_PTR(-ENOENT);
951 acpi_gpio_update_gpiod_flags(dflags, &info);
952 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
957 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
958 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
959 * @propname: Property name of the GPIO
960 * @index: index of GpioIo/GpioInt resource (starting from %0)
961 * @info: info pointer to fill in (optional)
963 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
964 * Otherwise (i.e. it is a data-only non-device object), use the property-based
965 * GPIO lookup to get to the GPIO resource with the relevant information and use
966 * that to obtain the GPIO descriptor to return.
968 * If the GPIO cannot be translated or there is an error an ERR_PTR is
971 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
972 const char *propname, int index,
973 struct acpi_gpio_info *info)
975 struct acpi_gpio_lookup lookup;
976 struct acpi_device *adev;
979 adev = to_acpi_device_node(fwnode);
981 return acpi_get_gpiod_by_index(adev, propname, index, info);
983 if (!is_acpi_data_node(fwnode))
984 return ERR_PTR(-ENODEV);
987 return ERR_PTR(-EINVAL);
989 memset(&lookup, 0, sizeof(lookup));
990 lookup.index = index;
992 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
996 ret = acpi_gpio_resource_lookup(&lookup, info);
997 return ret ? ERR_PTR(ret) : lookup.desc;
1001 * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
1002 * @adev: pointer to a ACPI device to get IRQ from
1003 * @name: optional name of GpioInt resource
1004 * @index: index of GpioInt resource (starting from %0)
1006 * If the device has one or more GpioInt resources, this function can be
1007 * used to translate from the GPIO offset in the resource to the Linux IRQ
1010 * The function is idempotent, though each time it runs it will configure GPIO
1011 * pin direction according to the flags in GpioInt resource.
1013 * The function takes optional @name parameter. If the resource has a property
1014 * name, then only those will be taken into account.
1016 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
1018 int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
1021 unsigned int irq_flags;
1024 for (i = 0, idx = 0; idx <= index; i++) {
1025 struct acpi_gpio_info info;
1026 struct gpio_desc *desc;
1028 desc = acpi_get_gpiod_by_index(adev, name, i, &info);
1030 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
1031 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
1032 return PTR_ERR(desc);
1034 if (info.gpioint && idx++ == index) {
1035 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1036 enum gpiod_flags dflags = GPIOD_ASIS;
1041 return PTR_ERR(desc);
1043 irq = gpiod_to_irq(desc);
1047 acpi_gpio_update_gpiod_flags(&dflags, &info);
1048 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
1050 snprintf(label, sizeof(label), "GpioInt() %d", index);
1051 ret = gpiod_configure_flags(desc, label, lflags, dflags);
1055 ret = gpio_set_debounce_timeout(desc, info.debounce);
1059 irq_flags = acpi_dev_get_irq_type(info.triggering,
1062 /* Set type if specified and different than the current one */
1063 if (irq_flags != IRQ_TYPE_NONE &&
1064 irq_flags != irq_get_trigger_type(irq))
1065 irq_set_irq_type(irq, irq_flags);
1073 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
1076 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
1077 u32 bits, u64 *value, void *handler_context,
1078 void *region_context)
1080 struct acpi_gpio_chip *achip = region_context;
1081 struct gpio_chip *chip = achip->chip;
1082 struct acpi_resource_gpio *agpio;
1083 struct acpi_resource *ares;
1084 u16 pin_index = address;
1089 status = acpi_buffer_to_resource(achip->conn_info.connection,
1090 achip->conn_info.length, &ares);
1091 if (ACPI_FAILURE(status))
1094 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
1096 return AE_BAD_PARAMETER;
1099 agpio = &ares->data.gpio;
1101 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
1102 function == ACPI_WRITE)) {
1104 return AE_BAD_PARAMETER;
1107 length = min_t(u16, agpio->pin_table_length, pin_index + bits);
1108 for (i = pin_index; i < length; ++i) {
1109 int pin = agpio->pin_table[i];
1110 struct acpi_gpio_connection *conn;
1111 struct gpio_desc *desc;
1114 mutex_lock(&achip->conn_lock);
1117 list_for_each_entry(conn, &achip->conns, node) {
1118 if (conn->pin == pin) {
1126 * The same GPIO can be shared between operation region and
1127 * event but only if the access here is ACPI_READ. In that
1128 * case we "borrow" the event GPIO instead.
1130 if (!found && agpio->shareable == ACPI_SHARED &&
1131 function == ACPI_READ) {
1132 struct acpi_gpio_event *event;
1134 list_for_each_entry(event, &achip->events, node) {
1135 if (event->pin == pin) {
1144 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
1146 mutex_unlock(&achip->conn_lock);
1151 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1153 gpiochip_free_own_desc(desc);
1154 mutex_unlock(&achip->conn_lock);
1155 status = AE_NO_MEMORY;
1161 list_add_tail(&conn->node, &achip->conns);
1164 mutex_unlock(&achip->conn_lock);
1166 if (function == ACPI_WRITE)
1167 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
1169 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1177 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1179 struct gpio_chip *chip = achip->chip;
1180 acpi_handle handle = ACPI_HANDLE(chip->parent);
1183 INIT_LIST_HEAD(&achip->conns);
1184 mutex_init(&achip->conn_lock);
1185 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1186 acpi_gpio_adr_space_handler,
1188 if (ACPI_FAILURE(status))
1189 dev_err(chip->parent,
1190 "Failed to install GPIO OpRegion handler\n");
1193 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1195 struct gpio_chip *chip = achip->chip;
1196 acpi_handle handle = ACPI_HANDLE(chip->parent);
1197 struct acpi_gpio_connection *conn, *tmp;
1200 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1201 acpi_gpio_adr_space_handler);
1202 if (ACPI_FAILURE(status)) {
1203 dev_err(chip->parent,
1204 "Failed to remove GPIO OpRegion handler\n");
1208 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1209 gpiochip_free_own_desc(conn->desc);
1210 list_del(&conn->node);
1215 static struct gpio_desc *
1216 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1217 struct fwnode_handle *fwnode,
1219 unsigned long *lflags,
1220 enum gpiod_flags *dflags)
1222 struct gpio_chip *chip = achip->chip;
1223 struct gpio_desc *desc;
1227 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1228 *dflags = GPIOD_ASIS;
1231 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1234 return ERR_PTR(ret);
1236 desc = gpiochip_get_desc(chip, gpios[0]);
1241 *lflags |= GPIO_ACTIVE_LOW;
1243 if (fwnode_property_present(fwnode, "input"))
1244 *dflags |= GPIOD_IN;
1245 else if (fwnode_property_present(fwnode, "output-low"))
1246 *dflags |= GPIOD_OUT_LOW;
1247 else if (fwnode_property_present(fwnode, "output-high"))
1248 *dflags |= GPIOD_OUT_HIGH;
1250 return ERR_PTR(-EINVAL);
1252 fwnode_property_read_string(fwnode, "line-name", name);
1257 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1259 struct gpio_chip *chip = achip->chip;
1260 struct fwnode_handle *fwnode;
1262 device_for_each_child_node(chip->parent, fwnode) {
1263 unsigned long lflags;
1264 enum gpiod_flags dflags;
1265 struct gpio_desc *desc;
1269 if (!fwnode_property_present(fwnode, "gpio-hog"))
1272 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1277 ret = gpiod_hog(desc, name, lflags, dflags);
1279 dev_err(chip->parent, "Failed to hog GPIO\n");
1280 fwnode_handle_put(fwnode);
1286 void acpi_gpiochip_add(struct gpio_chip *chip)
1288 struct acpi_gpio_chip *acpi_gpio;
1289 struct acpi_device *adev;
1292 if (!chip || !chip->parent)
1295 adev = ACPI_COMPANION(chip->parent);
1299 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1301 dev_err(chip->parent,
1302 "Failed to allocate memory for ACPI GPIO chip\n");
1306 acpi_gpio->chip = chip;
1307 INIT_LIST_HEAD(&acpi_gpio->events);
1308 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1310 status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
1311 if (ACPI_FAILURE(status)) {
1312 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1317 acpi_gpiochip_request_regions(acpi_gpio);
1318 acpi_gpiochip_scan_gpios(acpi_gpio);
1319 acpi_dev_clear_dependencies(adev);
1322 void acpi_gpiochip_remove(struct gpio_chip *chip)
1324 struct acpi_gpio_chip *acpi_gpio;
1328 if (!chip || !chip->parent)
1331 handle = ACPI_HANDLE(chip->parent);
1335 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1336 if (ACPI_FAILURE(status)) {
1337 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1341 acpi_gpiochip_free_regions(acpi_gpio);
1343 acpi_detach_data(handle, acpi_gpio_chip_dh);
1347 void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
1349 /* Set default fwnode to parent's one if present */
1351 ACPI_COMPANION_SET(&gdev->dev, ACPI_COMPANION(gc->parent));
1354 static int acpi_gpio_package_count(const union acpi_object *obj)
1356 const union acpi_object *element = obj->package.elements;
1357 const union acpi_object *end = element + obj->package.count;
1358 unsigned int count = 0;
1360 while (element < end) {
1361 switch (element->type) {
1362 case ACPI_TYPE_LOCAL_REFERENCE:
1365 case ACPI_TYPE_INTEGER:
1378 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1380 unsigned int *count = data;
1382 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1383 *count += ares->data.gpio.pin_table_length;
1389 * acpi_gpio_count - count the GPIOs associated with a device / function
1390 * @dev: GPIO consumer, can be %NULL for system-global GPIOs
1391 * @con_id: function within the GPIO consumer
1394 * The number of GPIOs associated with a device / function or %-ENOENT,
1395 * if no GPIO has been assigned to the requested function.
1397 int acpi_gpio_count(struct device *dev, const char *con_id)
1399 struct acpi_device *adev = ACPI_COMPANION(dev);
1400 const union acpi_object *obj;
1401 const struct acpi_gpio_mapping *gm;
1402 int count = -ENOENT;
1407 /* Try first from _DSD */
1408 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1410 snprintf(propname, sizeof(propname), "%s-%s",
1411 con_id, gpio_suffixes[i]);
1413 snprintf(propname, sizeof(propname), "%s",
1416 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1419 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1421 else if (obj->type == ACPI_TYPE_PACKAGE)
1422 count = acpi_gpio_package_count(obj);
1423 } else if (adev->driver_gpios) {
1424 for (gm = adev->driver_gpios; gm->name; gm++)
1425 if (strcmp(propname, gm->name) == 0) {
1434 /* Then from plain _CRS GPIOs */
1436 struct list_head resource_list;
1437 unsigned int crs_count = 0;
1439 if (!acpi_can_fallback_to_crs(adev, con_id))
1442 INIT_LIST_HEAD(&resource_list);
1443 acpi_dev_get_resources(adev, &resource_list,
1444 acpi_find_gpio_count, &crs_count);
1445 acpi_dev_free_resource_list(&resource_list);
1449 return count ? count : -ENOENT;
1452 /* Run deferred acpi_gpiochip_request_irqs() */
1453 static int __init acpi_gpio_handle_deferred_request_irqs(void)
1455 struct acpi_gpio_chip *acpi_gpio, *tmp;
1457 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1458 list_for_each_entry_safe(acpi_gpio, tmp,
1459 &acpi_gpio_deferred_req_irqs_list,
1460 deferred_req_irqs_list_entry)
1461 acpi_gpiochip_request_irqs(acpi_gpio);
1463 acpi_gpio_deferred_req_irqs_done = true;
1464 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1468 /* We must use _sync so that this runs after the first deferred_probe run */
1469 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1471 static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
1474 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
1475 * a non existing micro-USB-B connector which puts the HDMI
1476 * DDC pins in GPIO mode, breaking HDMI support.
1479 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1480 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1482 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1483 .no_edge_events_on_boot = true,
1488 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
1489 * instead of controlling the actual micro-USB-B turns the 5V
1490 * boost for its USB-A connector off. The actual micro-USB-B
1491 * connector is wired for charging only.
1494 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
1495 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
1497 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1498 .no_edge_events_on_boot = true,
1503 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
1504 * external embedded-controller connected via I2C + an ACPI GPIO
1505 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
1508 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1509 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
1511 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1512 .ignore_wake = "INT33FC:02@12",
1517 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
1518 * external embedded-controller connected via I2C + an ACPI GPIO
1519 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1520 * When suspending by closing the LID, the power to the USB
1521 * keyboard is turned off, causing INT0002 ACPI events to
1522 * trigger once the XHCI controller notices the keyboard is
1523 * gone. So INT0002 events cause spurious wakeups too. Ignoring
1524 * EC wakes breaks wakeup when opening the lid, the user needs
1525 * to press the power-button to wakeup the system. The
1526 * alternative is suspend simply not working, which is worse.
1529 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1530 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
1532 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1533 .ignore_wake = "INT33FF:01@0,INT0002:00@2",
1538 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
1539 * external embedded-controller connected via I2C + an ACPI GPIO
1540 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
1543 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1544 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1545 DMI_MATCH(DMI_BOARD_NAME, "815D"),
1547 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1548 .ignore_wake = "INT33FC:02@28",
1553 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
1554 * external embedded-controller connected via I2C + an ACPI GPIO
1555 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1558 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1559 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1560 DMI_MATCH(DMI_BOARD_NAME, "813E"),
1562 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1563 .ignore_wake = "INT33FF:01@0",
1566 {} /* Terminating entry */
1569 static int __init acpi_gpio_setup_params(void)
1571 const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
1572 const struct dmi_system_id *id;
1574 id = dmi_first_match(gpiolib_acpi_quirks);
1576 quirk = id->driver_data;
1578 if (run_edge_events_on_boot < 0) {
1579 if (quirk && quirk->no_edge_events_on_boot)
1580 run_edge_events_on_boot = 0;
1582 run_edge_events_on_boot = 1;
1585 if (ignore_wake == NULL && quirk && quirk->ignore_wake)
1586 ignore_wake = quirk->ignore_wake;
1591 /* Directly after dmi_setup() which runs as core_initcall() */
1592 postcore_initcall(acpi_gpio_setup_params);