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 static char *ignore_interrupt;
36 module_param(ignore_interrupt, charp, 0444);
37 MODULE_PARM_DESC(ignore_interrupt,
38 "controller@pin combos on which to ignore interrupt "
39 "ignore_interrupt=controller@pin[,controller@pin[,...]]");
41 struct acpi_gpiolib_dmi_quirk {
42 bool no_edge_events_on_boot;
44 char *ignore_interrupt;
48 * struct acpi_gpio_event - ACPI GPIO event handler data
50 * @node: list-entry of the events list of the struct acpi_gpio_chip
51 * @handle: handle of ACPI method to execute when the IRQ triggers
52 * @handler: handler function to pass to request_irq() when requesting the IRQ
53 * @pin: GPIO pin number on the struct gpio_chip
54 * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
55 * @irqflags: flags to pass to request_irq() when requesting the IRQ
56 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
57 * @irq_requested:True if request_irq() has been done
58 * @desc: struct gpio_desc for the GPIO pin for this event
60 struct acpi_gpio_event {
61 struct list_head node;
63 irq_handler_t handler;
66 unsigned long irqflags;
69 struct gpio_desc *desc;
72 struct acpi_gpio_connection {
73 struct list_head node;
75 struct gpio_desc *desc;
78 struct acpi_gpio_chip {
80 * ACPICA requires that the first field of the context parameter
81 * passed to acpi_install_address_space_handler() is large enough
82 * to hold struct acpi_connection_info.
84 struct acpi_connection_info conn_info;
85 struct list_head conns;
86 struct mutex conn_lock;
87 struct gpio_chip *chip;
88 struct list_head events;
89 struct list_head deferred_req_irqs_list_entry;
93 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
94 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
95 * late_initcall_sync() handler, so that other builtin drivers can register their
96 * OpRegions before the event handlers can run. This list contains GPIO chips
97 * for which the acpi_gpiochip_request_irqs() call has been deferred.
99 static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
100 static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
101 static bool acpi_gpio_deferred_req_irqs_done;
103 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
105 return gc->parent && device_match_acpi_handle(gc->parent, data);
109 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
110 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
111 * @pin: ACPI GPIO pin number (0-based, controller-relative)
113 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
114 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
115 * controller does not have GPIO chip registered at the moment. This is to
116 * support probe deferral.
118 static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
120 struct gpio_chip *chip;
124 status = acpi_get_handle(NULL, path, &handle);
125 if (ACPI_FAILURE(status))
126 return ERR_PTR(-ENODEV);
128 chip = gpiochip_find(handle, acpi_gpiochip_find);
130 return ERR_PTR(-EPROBE_DEFER);
132 return gpiochip_get_desc(chip, pin);
136 * acpi_get_and_request_gpiod - Translate ACPI GPIO pin to GPIO descriptor and
137 * hold a refcount to the GPIO device.
138 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
139 * @pin: ACPI GPIO pin number (0-based, controller-relative)
140 * @label: Label to pass to gpiod_request()
142 * This function is a simple pass-through to acpi_get_gpiod(), except that
143 * as it is intended for use outside of the GPIO layer (in a similar fashion to
144 * gpiod_get_index() for example) it also holds a reference to the GPIO device.
146 struct gpio_desc *acpi_get_and_request_gpiod(char *path, unsigned int pin, char *label)
148 struct gpio_desc *gpio;
151 gpio = acpi_get_gpiod(path, pin);
155 ret = gpiod_request(gpio, label);
161 EXPORT_SYMBOL_GPL(acpi_get_and_request_gpiod);
163 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
165 struct acpi_gpio_event *event = data;
167 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
172 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
174 struct acpi_gpio_event *event = data;
176 acpi_execute_simple_method(event->handle, NULL, event->pin);
181 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
183 /* The address of this function is used as a key. */
186 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
187 struct acpi_resource_gpio **agpio)
189 struct acpi_resource_gpio *gpio;
191 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
194 gpio = &ares->data.gpio;
195 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
201 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
204 * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
205 * I/O resource or return False if not.
206 * @ares: Pointer to the ACPI resource to fetch
207 * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
209 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
210 struct acpi_resource_gpio **agpio)
212 struct acpi_resource_gpio *gpio;
214 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
217 gpio = &ares->data.gpio;
218 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
224 EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
226 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
227 struct acpi_gpio_event *event)
229 struct device *parent = acpi_gpio->chip->parent;
232 ret = request_threaded_irq(event->irq, NULL, event->handler,
233 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
235 dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
239 if (event->irq_is_wake)
240 enable_irq_wake(event->irq);
242 event->irq_requested = true;
244 /* Make sure we trigger the initial state of edge-triggered IRQs */
245 if (run_edge_events_on_boot &&
246 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
247 value = gpiod_get_raw_value_cansleep(event->desc);
248 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
249 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
250 event->handler(event->irq, event);
254 static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
256 struct acpi_gpio_event *event;
258 list_for_each_entry(event, &acpi_gpio->events, node)
259 acpi_gpiochip_request_irq(acpi_gpio, event);
262 static enum gpiod_flags
263 acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
265 /* GpioInt() implies input configuration */
266 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
269 switch (agpio->io_restriction) {
270 case ACPI_IO_RESTRICT_INPUT:
272 case ACPI_IO_RESTRICT_OUTPUT:
274 * ACPI GPIO resources don't contain an initial value for the
275 * GPIO. Therefore we deduce that value from the pull field
276 * and the polarity instead. If the pin is pulled up we assume
277 * default to be high, if it is pulled down we assume default
278 * to be low, otherwise we leave pin untouched. For active low
279 * polarity values will be switched. See also
280 * Documentation/firmware-guide/acpi/gpio-properties.rst.
282 switch (agpio->pin_config) {
283 case ACPI_PIN_CONFIG_PULLUP:
284 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
285 case ACPI_PIN_CONFIG_PULLDOWN:
286 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
296 * Assume that the BIOS has configured the direction and pull
302 static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
303 struct acpi_resource_gpio *agpio,
307 int polarity = GPIO_ACTIVE_HIGH;
308 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
309 unsigned int pin = agpio->pin_table[index];
310 struct gpio_desc *desc;
313 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
317 /* ACPI uses hundredths of milliseconds units */
318 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
320 dev_warn(chip->parent,
321 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
327 static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
330 const char *controller, *pin_str;
335 controller = ignore_list;
337 pin_str = strchr(controller, '@');
341 len = pin_str - controller;
342 if (len == strlen(controller_in) &&
343 strncmp(controller, controller_in, len) == 0) {
344 pin = simple_strtoul(pin_str + 1, &endp, 10);
345 if (*endp != 0 && *endp != ',')
352 controller = strchr(controller, ',');
359 pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
363 static bool acpi_gpio_irq_is_wake(struct device *parent,
364 struct acpi_resource_gpio *agpio)
366 unsigned int pin = agpio->pin_table[0];
368 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
371 if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
372 dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
379 /* Always returns AE_OK so that we keep looping over the resources */
380 static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
383 struct acpi_gpio_chip *acpi_gpio = context;
384 struct gpio_chip *chip = acpi_gpio->chip;
385 struct acpi_resource_gpio *agpio;
386 acpi_handle handle, evt_handle;
387 struct acpi_gpio_event *event;
388 irq_handler_t handler = NULL;
389 struct gpio_desc *desc;
393 if (!acpi_gpio_get_irq_resource(ares, &agpio))
396 handle = ACPI_HANDLE(chip->parent);
397 pin = agpio->pin_table[0];
401 sprintf(ev_name, "_%c%02X",
402 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
404 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
405 handler = acpi_gpio_irq_handler;
408 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
409 handler = acpi_gpio_irq_handler_evt;
414 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
416 dev_err(chip->parent,
417 "Failed to request GPIO for pin 0x%04X, err %ld\n",
422 ret = gpiochip_lock_as_irq(chip, pin);
424 dev_err(chip->parent,
425 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
430 irq = gpiod_to_irq(desc);
432 dev_err(chip->parent,
433 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
435 goto fail_unlock_irq;
438 if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
439 dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
443 event = kzalloc(sizeof(*event), GFP_KERNEL);
445 goto fail_unlock_irq;
447 event->irqflags = IRQF_ONESHOT;
448 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
449 if (agpio->polarity == ACPI_ACTIVE_HIGH)
450 event->irqflags |= IRQF_TRIGGER_HIGH;
452 event->irqflags |= IRQF_TRIGGER_LOW;
454 switch (agpio->polarity) {
455 case ACPI_ACTIVE_HIGH:
456 event->irqflags |= IRQF_TRIGGER_RISING;
458 case ACPI_ACTIVE_LOW:
459 event->irqflags |= IRQF_TRIGGER_FALLING;
462 event->irqflags |= IRQF_TRIGGER_RISING |
463 IRQF_TRIGGER_FALLING;
468 event->handle = evt_handle;
469 event->handler = handler;
471 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
475 list_add_tail(&event->node, &acpi_gpio->events);
480 gpiochip_unlock_as_irq(chip, pin);
482 gpiochip_free_own_desc(desc);
488 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
491 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
492 * handled by ACPI event methods which need to be called from the GPIO
493 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
494 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
495 * the ACPI event methods for those pins.
497 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
499 struct acpi_gpio_chip *acpi_gpio;
504 if (!chip->parent || !chip->to_irq)
507 handle = ACPI_HANDLE(chip->parent);
511 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
512 if (ACPI_FAILURE(status))
515 acpi_walk_resources(handle, "_AEI",
516 acpi_gpiochip_alloc_event, acpi_gpio);
518 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
519 defer = !acpi_gpio_deferred_req_irqs_done;
521 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
522 &acpi_gpio_deferred_req_irqs_list);
523 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
528 acpi_gpiochip_request_irqs(acpi_gpio);
530 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
533 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
536 * Free interrupts associated with GPIO ACPI event method for the given
539 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
541 struct acpi_gpio_chip *acpi_gpio;
542 struct acpi_gpio_event *event, *ep;
546 if (!chip->parent || !chip->to_irq)
549 handle = ACPI_HANDLE(chip->parent);
553 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
554 if (ACPI_FAILURE(status))
557 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
558 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
559 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
560 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
562 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
563 if (event->irq_requested) {
564 if (event->irq_is_wake)
565 disable_irq_wake(event->irq);
567 free_irq(event->irq, event);
570 gpiochip_unlock_as_irq(chip, event->pin);
571 gpiochip_free_own_desc(event->desc);
572 list_del(&event->node);
576 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
578 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
579 const struct acpi_gpio_mapping *gpios)
582 adev->driver_gpios = gpios;
587 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
589 void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
592 adev->driver_gpios = NULL;
594 EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
596 static void acpi_dev_release_driver_gpios(void *adev)
598 acpi_dev_remove_driver_gpios(adev);
601 int devm_acpi_dev_add_driver_gpios(struct device *dev,
602 const struct acpi_gpio_mapping *gpios)
604 struct acpi_device *adev = ACPI_COMPANION(dev);
607 ret = acpi_dev_add_driver_gpios(adev, gpios);
611 return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
613 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
615 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
616 const char *name, int index,
617 struct fwnode_reference_args *args,
618 unsigned int *quirks)
620 const struct acpi_gpio_mapping *gm;
622 if (!adev->driver_gpios)
625 for (gm = adev->driver_gpios; gm->name; gm++)
626 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
627 const struct acpi_gpio_params *par = gm->data + index;
629 args->fwnode = acpi_fwnode_handle(adev);
630 args->args[0] = par->crs_entry_index;
631 args->args[1] = par->line_index;
632 args->args[2] = par->active_low;
635 *quirks = gm->quirks;
643 __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
645 const enum gpiod_flags mask =
646 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
647 GPIOD_FLAGS_BIT_DIR_VAL;
651 * Check if the BIOS has IoRestriction with explicitly set direction
652 * and update @flags accordingly. Otherwise use whatever caller asked
655 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
656 enum gpiod_flags diff = *flags ^ update;
659 * Check if caller supplied incompatible GPIO initialization
662 * Return %-EINVAL to notify that firmware has different
663 * settings and we are going to use them.
665 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
666 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
668 *flags = (*flags & ~mask) | (update & mask);
674 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
676 struct device *dev = &info->adev->dev;
677 enum gpiod_flags old = *flags;
680 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
681 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
683 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
686 dev_dbg(dev, "Override GPIO initialization flags\n");
693 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
694 struct acpi_gpio_info *info)
696 switch (info->pin_config) {
697 case ACPI_PIN_CONFIG_PULLUP:
698 *lookupflags |= GPIO_PULL_UP;
700 case ACPI_PIN_CONFIG_PULLDOWN:
701 *lookupflags |= GPIO_PULL_DOWN;
703 case ACPI_PIN_CONFIG_NOPULL:
704 *lookupflags |= GPIO_PULL_DISABLE;
710 if (info->polarity == GPIO_ACTIVE_LOW)
711 *lookupflags |= GPIO_ACTIVE_LOW;
716 struct acpi_gpio_lookup {
717 struct acpi_gpio_info info;
721 struct gpio_desc *desc;
725 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
727 struct acpi_gpio_lookup *lookup = data;
729 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
733 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
734 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
735 struct gpio_desc *desc;
738 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
741 if (lookup->n++ != lookup->index)
744 pin_index = lookup->pin_index;
745 if (pin_index >= agpio->pin_table_length)
748 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
749 desc = gpio_to_desc(agpio->pin_table[pin_index]);
751 desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
752 agpio->pin_table[pin_index]);
754 lookup->info.pin_config = agpio->pin_config;
755 lookup->info.debounce = agpio->debounce_timeout;
756 lookup->info.gpioint = gpioint;
759 * Polarity and triggering are only specified for GpioInt
761 * Note: we expect here:
762 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
763 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
765 if (lookup->info.gpioint) {
766 lookup->info.polarity = agpio->polarity;
767 lookup->info.triggering = agpio->triggering;
769 lookup->info.polarity = lookup->active_low;
772 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
778 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
779 struct acpi_gpio_info *info)
781 struct acpi_device *adev = lookup->info.adev;
782 struct list_head res_list;
785 INIT_LIST_HEAD(&res_list);
787 ret = acpi_dev_get_resources(adev, &res_list,
788 acpi_populate_gpio_lookup,
793 acpi_dev_free_resource_list(&res_list);
799 *info = lookup->info;
803 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
804 const char *propname, int index,
805 struct acpi_gpio_lookup *lookup)
807 struct fwnode_reference_args args;
808 unsigned int quirks = 0;
811 memset(&args, 0, sizeof(args));
812 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
815 struct acpi_device *adev = to_acpi_device_node(fwnode);
820 if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
825 * The property was found and resolved, so need to lookup the GPIO based
828 if (!to_acpi_device_node(args.fwnode))
833 lookup->index = args.args[0];
834 lookup->pin_index = args.args[1];
835 lookup->active_low = !!args.args[2];
837 lookup->info.adev = to_acpi_device_node(args.fwnode);
838 lookup->info.quirks = quirks;
844 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
845 * @adev: pointer to a ACPI device to get GPIO from
846 * @propname: Property name of the GPIO (optional)
847 * @index: index of GpioIo/GpioInt resource (starting from %0)
848 * @info: info pointer to fill in (optional)
850 * Function goes through ACPI resources for @adev and based on @index looks
851 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
852 * and returns it. @index matches GpioIo/GpioInt resources only so if there
853 * are total %3 GPIO resources, the index goes from %0 to %2.
855 * If @propname is specified the GPIO is looked using device property. In
856 * that case @index is used to select the GPIO entry in the property value
857 * (in case of multiple).
859 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
862 * Note: if the GPIO resource has multiple entries in the pin list, this
863 * function only returns the first.
865 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
866 const char *propname, int index,
867 struct acpi_gpio_info *info)
869 struct acpi_gpio_lookup lookup;
873 return ERR_PTR(-ENODEV);
875 memset(&lookup, 0, sizeof(lookup));
876 lookup.index = index;
879 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
881 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
882 propname, index, &lookup);
886 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
887 dev_name(&lookup.info.adev->dev), lookup.index,
888 lookup.pin_index, lookup.active_low);
890 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
891 lookup.info.adev = adev;
894 ret = acpi_gpio_resource_lookup(&lookup, info);
895 return ret ? ERR_PTR(ret) : lookup.desc;
898 static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
901 /* Never allow fallback if the device has properties */
902 if (acpi_dev_has_props(adev) || adev->driver_gpios)
905 return con_id == NULL;
908 struct gpio_desc *acpi_find_gpio(struct device *dev,
911 enum gpiod_flags *dflags,
912 unsigned long *lookupflags)
914 struct acpi_device *adev = ACPI_COMPANION(dev);
915 struct acpi_gpio_info info;
916 struct gpio_desc *desc;
920 /* Try first from _DSD */
921 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
923 snprintf(propname, sizeof(propname), "%s-%s",
924 con_id, gpio_suffixes[i]);
926 snprintf(propname, sizeof(propname), "%s",
930 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
933 if (PTR_ERR(desc) == -EPROBE_DEFER)
934 return ERR_CAST(desc);
937 /* Then from plain _CRS GPIOs */
939 if (!acpi_can_fallback_to_crs(adev, con_id))
940 return ERR_PTR(-ENOENT);
942 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
948 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
949 dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
950 return ERR_PTR(-ENOENT);
953 acpi_gpio_update_gpiod_flags(dflags, &info);
954 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
959 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
960 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
961 * @propname: Property name of the GPIO
962 * @index: index of GpioIo/GpioInt resource (starting from %0)
963 * @info: info pointer to fill in (optional)
965 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
966 * Otherwise (i.e. it is a data-only non-device object), use the property-based
967 * GPIO lookup to get to the GPIO resource with the relevant information and use
968 * that to obtain the GPIO descriptor to return.
970 * If the GPIO cannot be translated or there is an error an ERR_PTR is
973 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
974 const char *propname, int index,
975 struct acpi_gpio_info *info)
977 struct acpi_gpio_lookup lookup;
978 struct acpi_device *adev;
981 adev = to_acpi_device_node(fwnode);
983 return acpi_get_gpiod_by_index(adev, propname, index, info);
985 if (!is_acpi_data_node(fwnode))
986 return ERR_PTR(-ENODEV);
989 return ERR_PTR(-EINVAL);
991 memset(&lookup, 0, sizeof(lookup));
992 lookup.index = index;
994 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
998 ret = acpi_gpio_resource_lookup(&lookup, info);
999 return ret ? ERR_PTR(ret) : lookup.desc;
1003 * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
1004 * @adev: pointer to a ACPI device to get IRQ from
1005 * @name: optional name of GpioInt resource
1006 * @index: index of GpioInt resource (starting from %0)
1008 * If the device has one or more GpioInt resources, this function can be
1009 * used to translate from the GPIO offset in the resource to the Linux IRQ
1012 * The function is idempotent, though each time it runs it will configure GPIO
1013 * pin direction according to the flags in GpioInt resource.
1015 * The function takes optional @name parameter. If the resource has a property
1016 * name, then only those will be taken into account.
1018 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
1020 int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
1023 unsigned int irq_flags;
1026 for (i = 0, idx = 0; idx <= index; i++) {
1027 struct acpi_gpio_info info;
1028 struct gpio_desc *desc;
1030 desc = acpi_get_gpiod_by_index(adev, name, i, &info);
1032 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
1033 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
1034 return PTR_ERR(desc);
1036 if (info.gpioint && idx++ == index) {
1037 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1038 enum gpiod_flags dflags = GPIOD_ASIS;
1043 return PTR_ERR(desc);
1045 irq = gpiod_to_irq(desc);
1049 acpi_gpio_update_gpiod_flags(&dflags, &info);
1050 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
1052 snprintf(label, sizeof(label), "GpioInt() %d", index);
1053 ret = gpiod_configure_flags(desc, label, lflags, dflags);
1057 /* ACPI uses hundredths of milliseconds units */
1058 ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
1062 irq_flags = acpi_dev_get_irq_type(info.triggering,
1066 * If the IRQ is not already in use then set type
1067 * if specified and different than the current one.
1069 if (can_request_irq(irq, irq_flags)) {
1070 if (irq_flags != IRQ_TYPE_NONE &&
1071 irq_flags != irq_get_trigger_type(irq))
1072 irq_set_irq_type(irq, irq_flags);
1074 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
1083 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
1086 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
1087 u32 bits, u64 *value, void *handler_context,
1088 void *region_context)
1090 struct acpi_gpio_chip *achip = region_context;
1091 struct gpio_chip *chip = achip->chip;
1092 struct acpi_resource_gpio *agpio;
1093 struct acpi_resource *ares;
1094 u16 pin_index = address;
1099 status = acpi_buffer_to_resource(achip->conn_info.connection,
1100 achip->conn_info.length, &ares);
1101 if (ACPI_FAILURE(status))
1104 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
1106 return AE_BAD_PARAMETER;
1109 agpio = &ares->data.gpio;
1111 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
1112 function == ACPI_WRITE)) {
1114 return AE_BAD_PARAMETER;
1117 length = min_t(u16, agpio->pin_table_length, pin_index + bits);
1118 for (i = pin_index; i < length; ++i) {
1119 unsigned int pin = agpio->pin_table[i];
1120 struct acpi_gpio_connection *conn;
1121 struct gpio_desc *desc;
1124 mutex_lock(&achip->conn_lock);
1127 list_for_each_entry(conn, &achip->conns, node) {
1128 if (conn->pin == pin) {
1136 * The same GPIO can be shared between operation region and
1137 * event but only if the access here is ACPI_READ. In that
1138 * case we "borrow" the event GPIO instead.
1140 if (!found && agpio->shareable == ACPI_SHARED &&
1141 function == ACPI_READ) {
1142 struct acpi_gpio_event *event;
1144 list_for_each_entry(event, &achip->events, node) {
1145 if (event->pin == pin) {
1154 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
1156 mutex_unlock(&achip->conn_lock);
1161 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1163 gpiochip_free_own_desc(desc);
1164 mutex_unlock(&achip->conn_lock);
1165 status = AE_NO_MEMORY;
1171 list_add_tail(&conn->node, &achip->conns);
1174 mutex_unlock(&achip->conn_lock);
1176 if (function == ACPI_WRITE)
1177 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
1179 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1187 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1189 struct gpio_chip *chip = achip->chip;
1190 acpi_handle handle = ACPI_HANDLE(chip->parent);
1193 INIT_LIST_HEAD(&achip->conns);
1194 mutex_init(&achip->conn_lock);
1195 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1196 acpi_gpio_adr_space_handler,
1198 if (ACPI_FAILURE(status))
1199 dev_err(chip->parent,
1200 "Failed to install GPIO OpRegion handler\n");
1203 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1205 struct gpio_chip *chip = achip->chip;
1206 acpi_handle handle = ACPI_HANDLE(chip->parent);
1207 struct acpi_gpio_connection *conn, *tmp;
1210 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1211 acpi_gpio_adr_space_handler);
1212 if (ACPI_FAILURE(status)) {
1213 dev_err(chip->parent,
1214 "Failed to remove GPIO OpRegion handler\n");
1218 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1219 gpiochip_free_own_desc(conn->desc);
1220 list_del(&conn->node);
1225 static struct gpio_desc *
1226 acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1227 struct fwnode_handle *fwnode,
1229 unsigned long *lflags,
1230 enum gpiod_flags *dflags)
1232 struct gpio_chip *chip = achip->chip;
1233 struct gpio_desc *desc;
1237 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1238 *dflags = GPIOD_ASIS;
1241 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1244 return ERR_PTR(ret);
1246 desc = gpiochip_get_desc(chip, gpios[0]);
1251 *lflags |= GPIO_ACTIVE_LOW;
1253 if (fwnode_property_present(fwnode, "input"))
1254 *dflags |= GPIOD_IN;
1255 else if (fwnode_property_present(fwnode, "output-low"))
1256 *dflags |= GPIOD_OUT_LOW;
1257 else if (fwnode_property_present(fwnode, "output-high"))
1258 *dflags |= GPIOD_OUT_HIGH;
1260 return ERR_PTR(-EINVAL);
1262 fwnode_property_read_string(fwnode, "line-name", name);
1267 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1269 struct gpio_chip *chip = achip->chip;
1270 struct fwnode_handle *fwnode;
1272 device_for_each_child_node(chip->parent, fwnode) {
1273 unsigned long lflags;
1274 enum gpiod_flags dflags;
1275 struct gpio_desc *desc;
1279 if (!fwnode_property_present(fwnode, "gpio-hog"))
1282 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1287 ret = gpiod_hog(desc, name, lflags, dflags);
1289 dev_err(chip->parent, "Failed to hog GPIO\n");
1290 fwnode_handle_put(fwnode);
1296 void acpi_gpiochip_add(struct gpio_chip *chip)
1298 struct acpi_gpio_chip *acpi_gpio;
1299 struct acpi_device *adev;
1302 if (!chip || !chip->parent)
1305 adev = ACPI_COMPANION(chip->parent);
1309 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1311 dev_err(chip->parent,
1312 "Failed to allocate memory for ACPI GPIO chip\n");
1316 acpi_gpio->chip = chip;
1317 INIT_LIST_HEAD(&acpi_gpio->events);
1318 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1320 status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
1321 if (ACPI_FAILURE(status)) {
1322 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1327 acpi_gpiochip_request_regions(acpi_gpio);
1328 acpi_gpiochip_scan_gpios(acpi_gpio);
1329 acpi_dev_clear_dependencies(adev);
1332 void acpi_gpiochip_remove(struct gpio_chip *chip)
1334 struct acpi_gpio_chip *acpi_gpio;
1338 if (!chip || !chip->parent)
1341 handle = ACPI_HANDLE(chip->parent);
1345 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1346 if (ACPI_FAILURE(status)) {
1347 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1351 acpi_gpiochip_free_regions(acpi_gpio);
1353 acpi_detach_data(handle, acpi_gpio_chip_dh);
1357 void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
1359 /* Set default fwnode to parent's one if present */
1361 ACPI_COMPANION_SET(&gdev->dev, ACPI_COMPANION(gc->parent));
1364 device_set_node(&gdev->dev, gc->fwnode);
1367 static int acpi_gpio_package_count(const union acpi_object *obj)
1369 const union acpi_object *element = obj->package.elements;
1370 const union acpi_object *end = element + obj->package.count;
1371 unsigned int count = 0;
1373 while (element < end) {
1374 switch (element->type) {
1375 case ACPI_TYPE_LOCAL_REFERENCE:
1378 case ACPI_TYPE_INTEGER:
1391 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1393 unsigned int *count = data;
1395 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1396 *count += ares->data.gpio.pin_table_length;
1402 * acpi_gpio_count - count the GPIOs associated with a device / function
1403 * @dev: GPIO consumer, can be %NULL for system-global GPIOs
1404 * @con_id: function within the GPIO consumer
1407 * The number of GPIOs associated with a device / function or %-ENOENT,
1408 * if no GPIO has been assigned to the requested function.
1410 int acpi_gpio_count(struct device *dev, const char *con_id)
1412 struct acpi_device *adev = ACPI_COMPANION(dev);
1413 const union acpi_object *obj;
1414 const struct acpi_gpio_mapping *gm;
1415 int count = -ENOENT;
1420 /* Try first from _DSD */
1421 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1423 snprintf(propname, sizeof(propname), "%s-%s",
1424 con_id, gpio_suffixes[i]);
1426 snprintf(propname, sizeof(propname), "%s",
1429 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1432 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1434 else if (obj->type == ACPI_TYPE_PACKAGE)
1435 count = acpi_gpio_package_count(obj);
1436 } else if (adev->driver_gpios) {
1437 for (gm = adev->driver_gpios; gm->name; gm++)
1438 if (strcmp(propname, gm->name) == 0) {
1447 /* Then from plain _CRS GPIOs */
1449 struct list_head resource_list;
1450 unsigned int crs_count = 0;
1452 if (!acpi_can_fallback_to_crs(adev, con_id))
1455 INIT_LIST_HEAD(&resource_list);
1456 acpi_dev_get_resources(adev, &resource_list,
1457 acpi_find_gpio_count, &crs_count);
1458 acpi_dev_free_resource_list(&resource_list);
1462 return count ? count : -ENOENT;
1465 /* Run deferred acpi_gpiochip_request_irqs() */
1466 static int __init acpi_gpio_handle_deferred_request_irqs(void)
1468 struct acpi_gpio_chip *acpi_gpio, *tmp;
1470 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1471 list_for_each_entry_safe(acpi_gpio, tmp,
1472 &acpi_gpio_deferred_req_irqs_list,
1473 deferred_req_irqs_list_entry)
1474 acpi_gpiochip_request_irqs(acpi_gpio);
1476 acpi_gpio_deferred_req_irqs_done = true;
1477 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1481 /* We must use _sync so that this runs after the first deferred_probe run */
1482 late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1484 static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
1487 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
1488 * a non existing micro-USB-B connector which puts the HDMI
1489 * DDC pins in GPIO mode, breaking HDMI support.
1492 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1493 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1495 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1496 .no_edge_events_on_boot = true,
1501 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
1502 * instead of controlling the actual micro-USB-B turns the 5V
1503 * boost for its USB-A connector off. The actual micro-USB-B
1504 * connector is wired for charging only.
1507 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
1508 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
1510 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1511 .no_edge_events_on_boot = true,
1516 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
1517 * external embedded-controller connected via I2C + an ACPI GPIO
1518 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
1521 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1522 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
1524 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1525 .ignore_wake = "INT33FC:02@12",
1530 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
1531 * external embedded-controller connected via I2C + an ACPI GPIO
1532 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1533 * When suspending by closing the LID, the power to the USB
1534 * keyboard is turned off, causing INT0002 ACPI events to
1535 * trigger once the XHCI controller notices the keyboard is
1536 * gone. So INT0002 events cause spurious wakeups too. Ignoring
1537 * EC wakes breaks wakeup when opening the lid, the user needs
1538 * to press the power-button to wakeup the system. The
1539 * alternative is suspend simply not working, which is worse.
1542 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1543 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
1545 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1546 .ignore_wake = "INT33FF:01@0,INT0002:00@2",
1551 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
1552 * external embedded-controller connected via I2C + an ACPI GPIO
1553 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
1556 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1557 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1558 DMI_MATCH(DMI_BOARD_NAME, "815D"),
1560 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1561 .ignore_wake = "INT33FC:02@28",
1566 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
1567 * external embedded-controller connected via I2C + an ACPI GPIO
1568 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1571 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1572 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1573 DMI_MATCH(DMI_BOARD_NAME, "813E"),
1575 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1576 .ignore_wake = "INT33FF:01@0",
1581 * Interrupt storm caused from edge triggered floating pin
1582 * Found in BIOS UX325UAZ.300
1583 * https://bugzilla.kernel.org/show_bug.cgi?id=216208
1586 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
1587 DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
1589 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1590 .ignore_interrupt = "AMDI0030:00@18",
1593 {} /* Terminating entry */
1596 static int __init acpi_gpio_setup_params(void)
1598 const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
1599 const struct dmi_system_id *id;
1601 id = dmi_first_match(gpiolib_acpi_quirks);
1603 quirk = id->driver_data;
1605 if (run_edge_events_on_boot < 0) {
1606 if (quirk && quirk->no_edge_events_on_boot)
1607 run_edge_events_on_boot = 0;
1609 run_edge_events_on_boot = 1;
1612 if (ignore_wake == NULL && quirk && quirk->ignore_wake)
1613 ignore_wake = quirk->ignore_wake;
1615 if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
1616 ignore_interrupt = quirk->ignore_interrupt;
1621 /* Directly after dmi_setup() which runs as core_initcall() */
1622 postcore_initcall(acpi_gpio_setup_params);