1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI helpers for GPIO API
5 * Copyright (C) 2012, Intel Corporation
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)
98 return gc->parent && device_match_acpi_handle(gc->parent, data);
102 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
103 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
104 * @pin: ACPI GPIO pin number (0-based, controller-relative)
106 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
107 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
108 * controller does not have GPIO chip registered at the moment. This is to
109 * support probe deferral.
111 static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
113 struct gpio_chip *chip;
117 status = acpi_get_handle(NULL, path, &handle);
118 if (ACPI_FAILURE(status))
119 return ERR_PTR(-ENODEV);
121 chip = gpiochip_find(handle, acpi_gpiochip_find);
123 return ERR_PTR(-EPROBE_DEFER);
125 return gpiochip_get_desc(chip, pin);
129 * acpi_get_and_request_gpiod - Translate ACPI GPIO pin to GPIO descriptor and
130 * hold a refcount to the GPIO device.
131 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
132 * @pin: ACPI GPIO pin number (0-based, controller-relative)
133 * @label: Label to pass to gpiod_request()
135 * This function is a simple pass-through to acpi_get_gpiod(), except that
136 * as it is intended for use outside of the GPIO layer (in a similar fashion to
137 * gpiod_get_index() for example) it also holds a reference to the GPIO device.
139 struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label)
141 struct gpio_desc *gpio;
144 gpio = acpi_get_gpiod(path, pin);
148 ret = gpiod_request(gpio, label);
154 EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod);
156 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
158 struct acpi_gpio_event *event = data;
160 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
165 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
167 struct acpi_gpio_event *event = data;
169 acpi_execute_simple_method(event->handle, NULL, event->pin);
174 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
176 /* The address of this function is used as a key. */
179 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
180 struct acpi_resource_gpio **agpio)
182 struct acpi_resource_gpio *gpio;
184 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
187 gpio = &ares->data.gpio;
188 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
194 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
197 * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
198 * I/O resource or return False if not.
199 * @ares: Pointer to the ACPI resource to fetch
200 * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
202 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
203 struct acpi_resource_gpio **agpio)
205 struct acpi_resource_gpio *gpio;
207 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
210 gpio = &ares->data.gpio;
211 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
217 EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
219 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
220 struct acpi_gpio_event *event)
222 struct device *parent = acpi_gpio->chip->parent;
225 ret = request_threaded_irq(event->irq, NULL, event->handler,
226 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
228 dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
232 if (event->irq_is_wake)
233 enable_irq_wake(event->irq);
235 event->irq_requested = true;
237 /* Make sure we trigger the initial state of edge-triggered IRQs */
238 if (run_edge_events_on_boot &&
239 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
240 value = gpiod_get_raw_value_cansleep(event->desc);
241 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
242 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
243 event->handler(event->irq, event);
247 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
249 struct acpi_gpio_event *event;
251 list_for_each_entry(event, &acpi_gpio->events, node)
252 acpi_gpiochip_request_irq(acpi_gpio, event);
255 static enum gpiod_flags
256 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
258 /* GpioInt() implies input configuration */
259 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
262 switch (agpio->io_restriction) {
263 case ACPI_IO_RESTRICT_INPUT:
265 case ACPI_IO_RESTRICT_OUTPUT:
267 * ACPI GPIO resources don't contain an initial value for the
268 * GPIO. Therefore we deduce that value from the pull field
269 * and the polarity instead. If the pin is pulled up we assume
270 * default to be high, if it is pulled down we assume default
271 * to be low, otherwise we leave pin untouched. For active low
272 * polarity values will be switched. See also
273 * Documentation/firmware-guide/acpi/gpio-properties.rst.
275 switch (agpio->pin_config) {
276 case ACPI_PIN_CONFIG_PULLUP:
277 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
278 case ACPI_PIN_CONFIG_PULLDOWN:
279 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
289 * Assume that the BIOS has configured the direction and pull
295 static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
296 struct acpi_resource_gpio *agpio,
300 int polarity = GPIO_ACTIVE_HIGH;
301 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
302 unsigned int pin = agpio->pin_table[index];
303 struct gpio_desc *desc;
306 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
310 /* ACPI uses hundredths of milliseconds units */
311 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
313 dev_warn(chip->parent,
314 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
320 static bool acpi_gpio_in_ignore_list(const char *controller_in, unsigned int pin_in)
322 const char *controller, *pin_str;
327 controller = ignore_wake;
329 pin_str = strchr(controller, '@');
333 len = pin_str - controller;
334 if (len == strlen(controller_in) &&
335 strncmp(controller, controller_in, len) == 0) {
336 pin = simple_strtoul(pin_str + 1, &endp, 10);
337 if (*endp != 0 && *endp != ',')
344 controller = strchr(controller, ',');
351 pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_wake: %s\n", ignore_wake);
355 static bool acpi_gpio_irq_is_wake(struct device *parent,
356 struct acpi_resource_gpio *agpio)
358 unsigned int pin = agpio->pin_table[0];
360 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
363 if (acpi_gpio_in_ignore_list(dev_name(parent), pin)) {
364 dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
371 /* Always returns AE_OK so that we keep looping over the resources */
372 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
375 struct acpi_gpio_chip *acpi_gpio = context;
376 struct gpio_chip *chip = acpi_gpio->chip;
377 struct acpi_resource_gpio *agpio;
378 acpi_handle handle, evt_handle;
379 struct acpi_gpio_event *event;
380 irq_handler_t handler = NULL;
381 struct gpio_desc *desc;
385 if (!acpi_gpio_get_irq_resource(ares, &agpio))
388 handle = ACPI_HANDLE(chip->parent);
389 pin = agpio->pin_table[0];
393 sprintf(ev_name, "_%c%02X",
394 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
396 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
397 handler = acpi_gpio_irq_handler;
400 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
401 handler = acpi_gpio_irq_handler_evt;
406 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
408 dev_err(chip->parent,
409 "Failed to request GPIO for pin 0x%04X, err %ld\n",
414 ret = gpiochip_lock_as_irq(chip, pin);
416 dev_err(chip->parent,
417 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
422 irq = gpiod_to_irq(desc);
424 dev_err(chip->parent,
425 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
427 goto fail_unlock_irq;
430 event = kzalloc(sizeof(*event), GFP_KERNEL);
432 goto fail_unlock_irq;
434 event->irqflags = IRQF_ONESHOT;
435 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
436 if (agpio->polarity == ACPI_ACTIVE_HIGH)
437 event->irqflags |= IRQF_TRIGGER_HIGH;
439 event->irqflags |= IRQF_TRIGGER_LOW;
441 switch (agpio->polarity) {
442 case ACPI_ACTIVE_HIGH:
443 event->irqflags |= IRQF_TRIGGER_RISING;
445 case ACPI_ACTIVE_LOW:
446 event->irqflags |= IRQF_TRIGGER_FALLING;
449 event->irqflags |= IRQF_TRIGGER_RISING |
450 IRQF_TRIGGER_FALLING;
455 event->handle = evt_handle;
456 event->handler = handler;
458 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
462 list_add_tail(&event->node, &acpi_gpio->events);
467 gpiochip_unlock_as_irq(chip, pin);
469 gpiochip_free_own_desc(desc);
475 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
478 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
479 * handled by ACPI event methods which need to be called from the GPIO
480 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
481 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
482 * the ACPI event methods for those pins.
484 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
486 struct acpi_gpio_chip *acpi_gpio;
491 if (!chip->parent || !chip->to_irq)
494 handle = ACPI_HANDLE(chip->parent);
498 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
499 if (ACPI_FAILURE(status))
502 acpi_walk_resources(handle, "_AEI",
503 acpi_gpiochip_alloc_event, acpi_gpio);
505 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
506 defer = !acpi_gpio_deferred_req_irqs_done;
508 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
509 &acpi_gpio_deferred_req_irqs_list);
510 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
515 acpi_gpiochip_request_irqs(acpi_gpio);
517 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
520 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
523 * Free interrupts associated with GPIO ACPI event method for the given
526 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
528 struct acpi_gpio_chip *acpi_gpio;
529 struct acpi_gpio_event *event, *ep;
533 if (!chip->parent || !chip->to_irq)
536 handle = ACPI_HANDLE(chip->parent);
540 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
541 if (ACPI_FAILURE(status))
544 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
545 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
546 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
547 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
549 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
550 if (event->irq_requested) {
551 if (event->irq_is_wake)
552 disable_irq_wake(event->irq);
554 free_irq(event->irq, event);
557 gpiochip_unlock_as_irq(chip, event->pin);
558 gpiochip_free_own_desc(event->desc);
559 list_del(&event->node);
563 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
565 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
566 const struct acpi_gpio_mapping *gpios)
569 adev->driver_gpios = gpios;
574 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
576 void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
579 adev->driver_gpios = NULL;
581 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
583 static void acpi_dev_release_driver_gpios(void *adev)
585 acpi_dev_remove_driver_gpios(adev);
588 int devm_acpi_dev_add_driver_gpios(struct device *dev,
589 const struct acpi_gpio_mapping *gpios)
591 struct acpi_device *adev = ACPI_COMPANION(dev);
594 ret = acpi_dev_add_driver_gpios(adev, gpios);
598 return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
600 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
602 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
603 const char *name, int index,
604 struct fwnode_reference_args *args,
605 unsigned int *quirks)
607 const struct acpi_gpio_mapping *gm;
609 if (!adev->driver_gpios)
612 for (gm = adev->driver_gpios; gm->name; gm++)
613 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
614 const struct acpi_gpio_params *par = gm->data + index;
616 args->fwnode = acpi_fwnode_handle(adev);
617 args->args[0] = par->crs_entry_index;
618 args->args[1] = par->line_index;
619 args->args[2] = par->active_low;
622 *quirks = gm->quirks;
630 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
632 const enum gpiod_flags mask =
633 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
634 GPIOD_FLAGS_BIT_DIR_VAL;
638 * Check if the BIOS has IoRestriction with explicitly set direction
639 * and update @flags accordingly. Otherwise use whatever caller asked
642 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
643 enum gpiod_flags diff = *flags ^ update;
646 * Check if caller supplied incompatible GPIO initialization
649 * Return %-EINVAL to notify that firmware has different
650 * settings and we are going to use them.
652 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
653 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
655 *flags = (*flags & ~mask) | (update & mask);
661 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
663 struct device *dev = &info->adev->dev;
664 enum gpiod_flags old = *flags;
667 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
668 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
670 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
673 dev_dbg(dev, "Override GPIO initialization flags\n");
680 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
681 struct acpi_gpio_info *info)
683 switch (info->pin_config) {
684 case ACPI_PIN_CONFIG_PULLUP:
685 *lookupflags |= GPIO_PULL_UP;
687 case ACPI_PIN_CONFIG_PULLDOWN:
688 *lookupflags |= GPIO_PULL_DOWN;
690 case ACPI_PIN_CONFIG_NOPULL:
691 *lookupflags |= GPIO_PULL_DISABLE;
697 if (info->polarity == GPIO_ACTIVE_LOW)
698 *lookupflags |= GPIO_ACTIVE_LOW;
703 struct acpi_gpio_lookup {
704 struct acpi_gpio_info info;
708 struct gpio_desc *desc;
712 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
714 struct acpi_gpio_lookup *lookup = data;
716 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
720 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
721 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
722 struct gpio_desc *desc;
725 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
728 if (lookup->n++ != lookup->index)
731 pin_index = lookup->pin_index;
732 if (pin_index >= agpio->pin_table_length)
735 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
736 desc = gpio_to_desc(agpio->pin_table[pin_index]);
738 desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
739 agpio->pin_table[pin_index]);
741 lookup->info.pin_config = agpio->pin_config;
742 lookup->info.debounce = agpio->debounce_timeout;
743 lookup->info.gpioint = gpioint;
746 * Polarity and triggering are only specified for GpioInt
748 * Note: we expect here:
749 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
750 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
752 if (lookup->info.gpioint) {
753 lookup->info.polarity = agpio->polarity;
754 lookup->info.triggering = agpio->triggering;
756 lookup->info.polarity = lookup->active_low;
759 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
765 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
766 struct acpi_gpio_info *info)
768 struct acpi_device *adev = lookup->info.adev;
769 struct list_head res_list;
772 INIT_LIST_HEAD(&res_list);
774 ret = acpi_dev_get_resources(adev, &res_list,
775 acpi_populate_gpio_lookup,
780 acpi_dev_free_resource_list(&res_list);
786 *info = lookup->info;
790 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
791 const char *propname, int index,
792 struct acpi_gpio_lookup *lookup)
794 struct fwnode_reference_args args;
795 unsigned int quirks = 0;
798 memset(&args, 0, sizeof(args));
799 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
802 struct acpi_device *adev = to_acpi_device_node(fwnode);
807 if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
812 * The property was found and resolved, so need to lookup the GPIO based
815 if (!to_acpi_device_node(args.fwnode))
820 lookup->index = args.args[0];
821 lookup->pin_index = args.args[1];
822 lookup->active_low = !!args.args[2];
824 lookup->info.adev = to_acpi_device_node(args.fwnode);
825 lookup->info.quirks = quirks;
831 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
832 * @adev: pointer to a ACPI device to get GPIO from
833 * @propname: Property name of the GPIO (optional)
834 * @index: index of GpioIo/GpioInt resource (starting from %0)
835 * @info: info pointer to fill in (optional)
837 * Function goes through ACPI resources for @adev and based on @index looks
838 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
839 * and returns it. @index matches GpioIo/GpioInt resources only so if there
840 * are total %3 GPIO resources, the index goes from %0 to %2.
842 * If @propname is specified the GPIO is looked using device property. In
843 * that case @index is used to select the GPIO entry in the property value
844 * (in case of multiple).
846 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
849 * Note: if the GPIO resource has multiple entries in the pin list, this
850 * function only returns the first.
852 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
853 const char *propname, int index,
854 struct acpi_gpio_info *info)
856 struct acpi_gpio_lookup lookup;
860 return ERR_PTR(-ENODEV);
862 memset(&lookup, 0, sizeof(lookup));
863 lookup.index = index;
866 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
868 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
869 propname, index, &lookup);
873 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
874 dev_name(&lookup.info.adev->dev), lookup.index,
875 lookup.pin_index, lookup.active_low);
877 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
878 lookup.info.adev = adev;
881 ret = acpi_gpio_resource_lookup(&lookup, info);
882 return ret ? ERR_PTR(ret) : lookup.desc;
885 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
888 /* Never allow fallback if the device has properties */
889 if (acpi_dev_has_props(adev) || adev->driver_gpios)
892 return con_id == NULL;
895 struct gpio_desc *acpi_find_gpio(struct device *dev,
898 enum gpiod_flags *dflags,
899 unsigned long *lookupflags)
901 struct acpi_device *adev = ACPI_COMPANION(dev);
902 struct acpi_gpio_info info;
903 struct gpio_desc *desc;
907 /* Try first from _DSD */
908 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
910 snprintf(propname, sizeof(propname), "%s-%s",
911 con_id, gpio_suffixes[i]);
913 snprintf(propname, sizeof(propname), "%s",
917 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
920 if (PTR_ERR(desc) == -EPROBE_DEFER)
921 return ERR_CAST(desc);
924 /* Then from plain _CRS GPIOs */
926 if (!acpi_can_fallback_to_crs(adev, con_id))
927 return ERR_PTR(-ENOENT);
929 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
935 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
936 dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
937 return ERR_PTR(-ENOENT);
940 acpi_gpio_update_gpiod_flags(dflags, &info);
941 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
946 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
947 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
948 * @propname: Property name of the GPIO
949 * @index: index of GpioIo/GpioInt resource (starting from %0)
950 * @info: info pointer to fill in (optional)
952 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
953 * Otherwise (i.e. it is a data-only non-device object), use the property-based
954 * GPIO lookup to get to the GPIO resource with the relevant information and use
955 * that to obtain the GPIO descriptor to return.
957 * If the GPIO cannot be translated or there is an error an ERR_PTR is
960 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
961 const char *propname, int index,
962 struct acpi_gpio_info *info)
964 struct acpi_gpio_lookup lookup;
965 struct acpi_device *adev;
968 adev = to_acpi_device_node(fwnode);
970 return acpi_get_gpiod_by_index(adev, propname, index, info);
972 if (!is_acpi_data_node(fwnode))
973 return ERR_PTR(-ENODEV);
976 return ERR_PTR(-EINVAL);
978 memset(&lookup, 0, sizeof(lookup));
979 lookup.index = index;
981 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
985 ret = acpi_gpio_resource_lookup(&lookup, info);
986 return ret ? ERR_PTR(ret) : lookup.desc;
990 * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
991 * @adev: pointer to a ACPI device to get IRQ from
992 * @name: optional name of GpioInt resource
993 * @index: index of GpioInt resource (starting from %0)
995 * If the device has one or more GpioInt resources, this function can be
996 * used to translate from the GPIO offset in the resource to the Linux IRQ
999 * The function is idempotent, though each time it runs it will configure GPIO
1000 * pin direction according to the flags in GpioInt resource.
1002 * The function takes optional @name parameter. If the resource has a property
1003 * name, then only those will be taken into account.
1005 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
1007 int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
1010 unsigned int irq_flags;
1013 for (i = 0, idx = 0; idx <= index; i++) {
1014 struct acpi_gpio_info info;
1015 struct gpio_desc *desc;
1017 desc = acpi_get_gpiod_by_index(adev, name, i, &info);
1019 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
1020 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
1021 return PTR_ERR(desc);
1023 if (info.gpioint && idx++ == index) {
1024 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1025 enum gpiod_flags dflags = GPIOD_ASIS;
1030 return PTR_ERR(desc);
1032 irq = gpiod_to_irq(desc);
1036 acpi_gpio_update_gpiod_flags(&dflags, &info);
1037 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
1039 snprintf(label, sizeof(label), "GpioInt() %d", index);
1040 ret = gpiod_configure_flags(desc, label, lflags, dflags);
1044 /* ACPI uses hundredths of milliseconds units */
1045 ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
1049 irq_flags = acpi_dev_get_irq_type(info.triggering,
1053 * If the IRQ is not already in use then set type
1054 * if specified and different than the current one.
1056 if (can_request_irq(irq, irq_flags)) {
1057 if (irq_flags != IRQ_TYPE_NONE &&
1058 irq_flags != irq_get_trigger_type(irq))
1059 irq_set_irq_type(irq, irq_flags);
1061 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
1070 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
1073 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
1074 u32 bits, u64 *value, void *handler_context,
1075 void *region_context)
1077 struct acpi_gpio_chip *achip = region_context;
1078 struct gpio_chip *chip = achip->chip;
1079 struct acpi_resource_gpio *agpio;
1080 struct acpi_resource *ares;
1081 u16 pin_index = address;
1086 status = acpi_buffer_to_resource(achip->conn_info.connection,
1087 achip->conn_info.length, &ares);
1088 if (ACPI_FAILURE(status))
1091 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
1093 return AE_BAD_PARAMETER;
1096 agpio = &ares->data.gpio;
1098 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
1099 function == ACPI_WRITE)) {
1101 return AE_BAD_PARAMETER;
1104 length = min_t(u16, agpio->pin_table_length, pin_index + bits);
1105 for (i = pin_index; i < length; ++i) {
1106 unsigned int pin = agpio->pin_table[i];
1107 struct acpi_gpio_connection *conn;
1108 struct gpio_desc *desc;
1111 mutex_lock(&achip->conn_lock);
1114 list_for_each_entry(conn, &achip->conns, node) {
1115 if (conn->pin == pin) {
1123 * The same GPIO can be shared between operation region and
1124 * event but only if the access here is ACPI_READ. In that
1125 * case we "borrow" the event GPIO instead.
1127 if (!found && agpio->shareable == ACPI_SHARED &&
1128 function == ACPI_READ) {
1129 struct acpi_gpio_event *event;
1131 list_for_each_entry(event, &achip->events, node) {
1132 if (event->pin == pin) {
1141 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
1143 mutex_unlock(&achip->conn_lock);
1148 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1150 gpiochip_free_own_desc(desc);
1151 mutex_unlock(&achip->conn_lock);
1152 status = AE_NO_MEMORY;
1158 list_add_tail(&conn->node, &achip->conns);
1161 mutex_unlock(&achip->conn_lock);
1163 if (function == ACPI_WRITE)
1164 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
1166 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1174 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1176 struct gpio_chip *chip = achip->chip;
1177 acpi_handle handle = ACPI_HANDLE(chip->parent);
1180 INIT_LIST_HEAD(&achip->conns);
1181 mutex_init(&achip->conn_lock);
1182 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1183 acpi_gpio_adr_space_handler,
1185 if (ACPI_FAILURE(status))
1186 dev_err(chip->parent,
1187 "Failed to install GPIO OpRegion handler\n");
1190 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1192 struct gpio_chip *chip = achip->chip;
1193 acpi_handle handle = ACPI_HANDLE(chip->parent);
1194 struct acpi_gpio_connection *conn, *tmp;
1197 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1198 acpi_gpio_adr_space_handler);
1199 if (ACPI_FAILURE(status)) {
1200 dev_err(chip->parent,
1201 "Failed to remove GPIO OpRegion handler\n");
1205 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1206 gpiochip_free_own_desc(conn->desc);
1207 list_del(&conn->node);
1212 static struct gpio_desc *
1213 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1214 struct fwnode_handle *fwnode,
1216 unsigned long *lflags,
1217 enum gpiod_flags *dflags)
1219 struct gpio_chip *chip = achip->chip;
1220 struct gpio_desc *desc;
1224 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1225 *dflags = GPIOD_ASIS;
1228 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1231 return ERR_PTR(ret);
1233 desc = gpiochip_get_desc(chip, gpios[0]);
1238 *lflags |= GPIO_ACTIVE_LOW;
1240 if (fwnode_property_present(fwnode, "input"))
1241 *dflags |= GPIOD_IN;
1242 else if (fwnode_property_present(fwnode, "output-low"))
1243 *dflags |= GPIOD_OUT_LOW;
1244 else if (fwnode_property_present(fwnode, "output-high"))
1245 *dflags |= GPIOD_OUT_HIGH;
1247 return ERR_PTR(-EINVAL);
1249 fwnode_property_read_string(fwnode, "line-name", name);
1254 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1256 struct gpio_chip *chip = achip->chip;
1257 struct fwnode_handle *fwnode;
1259 device_for_each_child_node(chip->parent, fwnode) {
1260 unsigned long lflags;
1261 enum gpiod_flags dflags;
1262 struct gpio_desc *desc;
1266 if (!fwnode_property_present(fwnode, "gpio-hog"))
1269 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1274 ret = gpiod_hog(desc, name, lflags, dflags);
1276 dev_err(chip->parent, "Failed to hog GPIO\n");
1277 fwnode_handle_put(fwnode);
1283 void acpi_gpiochip_add(struct gpio_chip *chip)
1285 struct acpi_gpio_chip *acpi_gpio;
1286 struct acpi_device *adev;
1289 if (!chip || !chip->parent)
1292 adev = ACPI_COMPANION(chip->parent);
1296 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1298 dev_err(chip->parent,
1299 "Failed to allocate memory for ACPI GPIO chip\n");
1303 acpi_gpio->chip = chip;
1304 INIT_LIST_HEAD(&acpi_gpio->events);
1305 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1307 status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
1308 if (ACPI_FAILURE(status)) {
1309 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1314 acpi_gpiochip_request_regions(acpi_gpio);
1315 acpi_gpiochip_scan_gpios(acpi_gpio);
1316 acpi_dev_clear_dependencies(adev);
1319 void acpi_gpiochip_remove(struct gpio_chip *chip)
1321 struct acpi_gpio_chip *acpi_gpio;
1325 if (!chip || !chip->parent)
1328 handle = ACPI_HANDLE(chip->parent);
1332 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1333 if (ACPI_FAILURE(status)) {
1334 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1338 acpi_gpiochip_free_regions(acpi_gpio);
1340 acpi_detach_data(handle, acpi_gpio_chip_dh);
1344 void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
1346 /* Set default fwnode to parent's one if present */
1348 ACPI_COMPANION_SET(&gdev->dev, ACPI_COMPANION(gc->parent));
1351 device_set_node(&gdev->dev, gc->fwnode);
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);